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TODO: add note about chase_symlink flag
[thirdparty/systemd.git] / src / nspawn / nspawn.c
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db9ecf05 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
88213476 2
349cc4a5 3#if HAVE_BLKID
8fe0087e 4#endif
88213476 5#include <errno.h>
88213476 6#include <getopt.h>
503f480f 7#include <linux/fs.h>
1b9e5b12 8#include <linux/loop.h>
349cc4a5 9#if HAVE_SELINUX
8fe0087e 10#include <selinux/selinux.h>
1b9e5b12 11#endif
8fe0087e 12#include <stdlib.h>
8fe0087e 13#include <sys/file.h>
335d2ead 14#include <sys/ioctl.h>
8fe0087e
LP		 15#include <sys/personality.h>
16#include <sys/prctl.h>
17#include <sys/types.h>
6916b164 18#include <sys/wait.h>
335d2ead 19#include <termios.h>
8fe0087e 20#include <unistd.h>
1b9e5b12 21
b053cd5f 22#include "sd-bus.h"
1f0cd86b 23#include "sd-daemon.h"
1f0cd86b 24#include "sd-id128.h"
8fe0087e 25
b5efdb8a 26#include "alloc-util.h"
8fe0087e
LP		 27#include "barrier.h"
28#include "base-filesystem.h"
29#include "blkid-util.h"
30#include "btrfs-util.h"
b8ea7a6e 31#include "bus-error.h"
b053cd5f 32#include "bus-util.h"
8fe0087e 33#include "cap-list.h"
430f0182 34#include "capability-util.h"
04d391da 35#include "cgroup-util.h"
f4351959 36#include "chase-symlinks.h"
8fe0087e 37#include "copy.h"
d107bb7d 38#include "cpu-set-util.h"
786d19fd 39#include "creds-util.h"
4fc9982c 40#include "dev-setup.h"
57f1b61b 41#include "discover-image.h"
2d845785 42#include "dissect-image.h"
8fe0087e 43#include "env-util.h"
3652872a 44#include "escape.h"
3ffd4af2 45#include "fd-util.h"
842f3b0f 46#include "fdset.h"
a5c32cff 47#include "fileio.h"
f97b34a6 48#include "format-util.h"
f4f15635 49#include "fs-util.h"
1b9e5b12 50#include "gpt.h"
4623e8e6 51#include "hexdecoct.h"
e2054217 52#include "hostname-setup.h"
8fe0087e 53#include "hostname-util.h"
910fd145 54#include "id128-util.h"
3652872a 55#include "io-util.h"
8fe0087e 56#include "log.h"
2d845785 57#include "loop-util.h"
8fe0087e 58#include "loopback-setup.h"
8fe0087e 59#include "macro.h"
44dbef90 60#include "main-func.h"
f5947a5e 61#include "missing_sched.h"
8fe0087e 62#include "mkdir.h"
4349cd7c 63#include "mount-util.h"
049af8ad 64#include "mountpoint-util.h"
0cb8e3d1 65#include "namespace-util.h"
8fe0087e 66#include "netlink-util.h"
2f893044 67#include "nspawn-bind-user.h"
07630cea 68#include "nspawn-cgroup.h"
3652872a 69#include "nspawn-creds.h"
3603efde 70#include "nspawn-def.h"
07630cea
LP		 71#include "nspawn-expose-ports.h"
72#include "nspawn-mount.h"
73#include "nspawn-network.h"
de40a303 74#include "nspawn-oci.h"
7336138e 75#include "nspawn-patch-uid.h"
07630cea 76#include "nspawn-register.h"
910fd145 77#include "nspawn-seccomp.h"
07630cea
LP		 78#include "nspawn-settings.h"
79#include "nspawn-setuid.h"
7732f92b 80#include "nspawn-stub-pid1.h"
91181e07 81#include "nspawn.h"
d8b4d14d 82#include "nulstr-util.h"
d58ad743 83#include "os-util.h"
50ebcf6c 84#include "pager.h"
614b022c 85#include "parse-argument.h"
6bedfcbb 86#include "parse-util.h"
8fe0087e 87#include "path-util.h"
294bf0c3 88#include "pretty-print.h"
0b452006 89#include "process-util.h"
8fe0087e
LP		 90#include "ptyfwd.h"
91#include "random-util.h"
8869a0b4 92#include "raw-clone.h"
86775e35 93#include "resolve-util.h"
bf428efb 94#include "rlimit-util.h"
8fe0087e 95#include "rm-rf.h"
de40a303
LP		 96#if HAVE_SECCOMP
97#include "seccomp-util.h"
98#endif
68b02049 99#include "selinux-util.h"
8fe0087e 100#include "signal-util.h"
2583fbea 101#include "socket-util.h"
8fcde012 102#include "stat-util.h"
15a5e950 103#include "stdio-util.h"
5c828e66 104#include "string-table.h"
07630cea 105#include "string-util.h"
8fe0087e 106#include "strv.h"
de40a303 107#include "sysctl-util.h"
8fe0087e 108#include "terminal-util.h"
e4de7287 109#include "tmpfile-util.h"
affb60b1 110#include "umask-util.h"
43c3fb46 111#include "unit-name.h"
b1d4f8e1 112#include "user-util.h"
8fe0087e 113#include "util.h"
e9642be2 114
e96ceaba
LP		 115/* The notify socket inside the container it can use to talk to nspawn using the sd_notify(3) protocol */
116#define NSPAWN_NOTIFY_SOCKET_PATH "/run/host/notify"
0e7ac751 117
2a49b612
ZJS		 118#define EXIT_FORCE_RESTART 133
119
113cea80
DH		 120typedef enum ContainerStatus {
121 CONTAINER_TERMINATED,
6145bb4f 122 CONTAINER_REBOOTED,
113cea80
DH		 123} ContainerStatus;
124
88213476 125static char *arg_directory = NULL;
ec16945e 126static char *arg_template = NULL;
5f932eb9 127static char *arg_chdir = NULL;
b53ede69
PW		 128static char *arg_pivot_root_new = NULL;
129static char *arg_pivot_root_old = NULL;
687d0825 130static char *arg_user = NULL;
de40a303
LP		 131static uid_t arg_uid = UID_INVALID;
132static gid_t arg_gid = GID_INVALID;
133static gid_t* arg_supplementary_gids = NULL;
134static size_t arg_n_supplementary_gids = 0;
9444b1f2 135static sd_id128_t arg_uuid = {};
3a9530e5
LP		 136static char *arg_machine = NULL; /* The name used by the host to refer to this */
137static char *arg_hostname = NULL; /* The name the payload sees by default */
c74e630d
LP		 138static const char *arg_selinux_context = NULL;
139static const char *arg_selinux_apifs_context = NULL;
de40a303 140static char *arg_slice = NULL;
ff01d048 141static bool arg_private_network = false;
bc2f673e 142static bool arg_read_only = false;
7732f92b 143static StartMode arg_start_mode = START_PID1;
ec16945e 144static bool arg_ephemeral = false;
57fb9fb5 145static LinkJournal arg_link_journal = LINK_AUTO;
574edc90 146static bool arg_link_journal_try = false;
520e0d54 147static uint64_t arg_caps_retain =
50b52222
LP		 148 (1ULL << CAP_AUDIT_CONTROL) |
149 (1ULL << CAP_AUDIT_WRITE) |
5076f0cc
LP		 150 (1ULL << CAP_CHOWN) |
151 (1ULL << CAP_DAC_OVERRIDE) |
152 (1ULL << CAP_DAC_READ_SEARCH) |
153 (1ULL << CAP_FOWNER) |
154 (1ULL << CAP_FSETID) |
155 (1ULL << CAP_IPC_OWNER) |
156 (1ULL << CAP_KILL) |
157 (1ULL << CAP_LEASE) |
158 (1ULL << CAP_LINUX_IMMUTABLE) |
50b52222 159 (1ULL << CAP_MKNOD) |
5076f0cc
LP		 160 (1ULL << CAP_NET_BIND_SERVICE) |
161 (1ULL << CAP_NET_BROADCAST) |
162 (1ULL << CAP_NET_RAW) |
5076f0cc 163 (1ULL << CAP_SETFCAP) |
50b52222 164 (1ULL << CAP_SETGID) |
5076f0cc
LP		 165 (1ULL << CAP_SETPCAP) |
166 (1ULL << CAP_SETUID) |
167 (1ULL << CAP_SYS_ADMIN) |
50b52222 168 (1ULL << CAP_SYS_BOOT) |
5076f0cc
LP		 169 (1ULL << CAP_SYS_CHROOT) |
170 (1ULL << CAP_SYS_NICE) |
171 (1ULL << CAP_SYS_PTRACE) |
d87be9b0 172 (1ULL << CAP_SYS_RESOURCE) |
50b52222 173 (1ULL << CAP_SYS_TTY_CONFIG);
88fc9c9b 174static uint64_t arg_caps_ambient = 0;
de40a303 175static CapabilityQuintet arg_full_capabilities = CAPABILITY_QUINTET_NULL;
5a8af538 176static CustomMount *arg_custom_mounts = NULL;
88614c8a 177static size_t arg_n_custom_mounts = 0;
f4889f65 178static char **arg_setenv = NULL;
284c0b91 179static bool arg_quiet = false;
eb91eb18 180static bool arg_register = true;
89f7c846 181static bool arg_keep_unit = false;
aa28aefe 182static char **arg_network_interfaces = NULL;
c74e630d 183static char **arg_network_macvlan = NULL;
4bbfe7ad 184static char **arg_network_ipvlan = NULL;
69c79d3c 185static bool arg_network_veth = false;
f6d6bad1 186static char **arg_network_veth_extra = NULL;
f757855e 187static char *arg_network_bridge = NULL;
22b28dfd 188static char *arg_network_zone = NULL;
d7bea6b6 189static char *arg_network_namespace_path = NULL;
bb068de0 190static PagerFlags arg_pager_flags = 0;
050f7277 191static unsigned long arg_personality = PERSONALITY_INVALID;
ec16945e 192static char *arg_image = NULL;
de40a303 193static char *arg_oci_bundle = NULL;
f757855e 194static VolatileMode arg_volatile_mode = VOLATILE_NO;
6d0b55c2 195static ExposePort *arg_expose_ports = NULL;
f36933fe 196static char **arg_property = NULL;
de40a303 197static sd_bus_message *arg_property_message = NULL;
0de7acce 198static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO;
6dac160c 199static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
6c045a99 200static UserNamespaceOwnership arg_userns_ownership = _USER_NAMESPACE_OWNERSHIP_INVALID;
c6c8f6e2 201static int arg_kill_signal = 0;
5da38d07 202static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN;
f757855e
LP		 203static SettingsMask arg_settings_mask = 0;
204static int arg_settings_trusted = -1;
205static char **arg_parameters = NULL;
6aadfa4c 206static const char *arg_container_service_name = "systemd-nspawn";
9c1e04d0 207static bool arg_notify_ready = false;
5a8ff0e6 208static bool arg_use_cgns = true;
0c582db0 209static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS;
1099ceeb 210static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_TMPFS_TMP;
aee36b4e 211static VeritySettings arg_verity_settings = VERITY_SETTINGS_DEFAULT;
6b000af4
LP		 212static char **arg_syscall_allow_list = NULL;
213static char **arg_syscall_deny_list = NULL;
de40a303
LP		 214#if HAVE_SECCOMP
215static scmp_filter_ctx arg_seccomp = NULL;
216#endif
bf428efb 217static struct rlimit *arg_rlimit[_RLIMIT_MAX] = {};
66edd963 218static bool arg_no_new_privileges = false;
81f345df
LP		 219static int arg_oom_score_adjust = 0;
220static bool arg_oom_score_adjust_set = false;
0985c7c4 221static CPUSet arg_cpu_set = {};
09d423e9 222static ResolvConfMode arg_resolv_conf = RESOLV_CONF_AUTO;
1688841f 223static TimezoneMode arg_timezone = TIMEZONE_AUTO;
f5fbe71d 224static unsigned arg_console_width = UINT_MAX, arg_console_height = UINT_MAX;
de40a303
LP		 225static DeviceNode* arg_extra_nodes = NULL;
226static size_t arg_n_extra_nodes = 0;
227static char **arg_sysctl = NULL;
228static ConsoleMode arg_console_mode = _CONSOLE_MODE_INVALID;
3652872a
LP		 229static Credential *arg_credentials = NULL;
230static size_t arg_n_credentials = 0;
2f893044 231static char **arg_bind_user = NULL;
4a4654e0 232static bool arg_suppress_sync = false;
88213476 233
6145bb4f
LP		 234STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
235STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
236STATIC_DESTRUCTOR_REGISTER(arg_chdir, freep);
237STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new, freep);
238STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old, freep);
239STATIC_DESTRUCTOR_REGISTER(arg_user, freep);
240STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids, freep);
241STATIC_DESTRUCTOR_REGISTER(arg_machine, freep);
242STATIC_DESTRUCTOR_REGISTER(arg_hostname, freep);
243STATIC_DESTRUCTOR_REGISTER(arg_slice, freep);
244STATIC_DESTRUCTOR_REGISTER(arg_setenv, strv_freep);
245STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces, strv_freep);
246STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan, strv_freep);
247STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan, strv_freep);
248STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra, strv_freep);
249STATIC_DESTRUCTOR_REGISTER(arg_network_bridge, freep);
250STATIC_DESTRUCTOR_REGISTER(arg_network_zone, freep);
251STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path, freep);
252STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
253STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle, freep);
254STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep);
255STATIC_DESTRUCTOR_REGISTER(arg_property_message, sd_bus_message_unrefp);
256STATIC_DESTRUCTOR_REGISTER(arg_parameters, strv_freep);
89e62e0b 257STATIC_DESTRUCTOR_REGISTER(arg_verity_settings, verity_settings_done);
6b000af4
LP		 258STATIC_DESTRUCTOR_REGISTER(arg_syscall_allow_list, strv_freep);
259STATIC_DESTRUCTOR_REGISTER(arg_syscall_deny_list, strv_freep);
6145bb4f
LP		 260#if HAVE_SECCOMP
261STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep);
262#endif
0985c7c4 263STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset);
6145bb4f 264STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
2f893044 265STATIC_DESTRUCTOR_REGISTER(arg_bind_user, strv_freep);
6145bb4f 266
dce66ffe
ZJS		 267static int handle_arg_console(const char *arg) {
268 if (streq(arg, "help")) {
10e8a60b
LP		 269 puts("autopipe\n"
270 "interactive\n"
dce66ffe 271 "passive\n"
10e8a60b
LP		 272 "pipe\n"
273 "read-only");
dce66ffe
ZJS		 274 return 0;
275 }
276
277 if (streq(arg, "interactive"))
278 arg_console_mode = CONSOLE_INTERACTIVE;
279 else if (streq(arg, "read-only"))
280 arg_console_mode = CONSOLE_READ_ONLY;
281 else if (streq(arg, "passive"))
282 arg_console_mode = CONSOLE_PASSIVE;
554c4beb
LP		 283 else if (streq(arg, "pipe")) {
284 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
285 log_full(arg_quiet ? LOG_DEBUG : LOG_NOTICE,
286 "Console mode 'pipe' selected, but standard input/output are connected to an interactive TTY. "
287 "Most likely you want to use 'interactive' console mode for proper interactivity and shell job control. "
288 "Proceeding anyway.");
289
dce66ffe 290 arg_console_mode = CONSOLE_PIPE;
10e8a60b
LP		 291 } else if (streq(arg, "autopipe")) {
292 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
293 arg_console_mode = CONSOLE_INTERACTIVE;
294 else
295 arg_console_mode = CONSOLE_PIPE;
554c4beb 296 } else
dce66ffe
ZJS		 297 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown console mode: %s", optarg);
298
299 arg_settings_mask |= SETTING_CONSOLE_MODE;
300 return 1;
301}
302
37ec0fdd
LP		 303static int help(void) {
304 _cleanup_free_ char *link = NULL;
305 int r;
306
bb068de0 307 (void) pager_open(arg_pager_flags);
50ebcf6c 308
37ec0fdd
LP		 309 r = terminal_urlify_man("systemd-nspawn", "1", &link);
310 if (r < 0)
311 return log_oom();
312
25148653 313 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
37a92352 314 "%5$sSpawn a command or OS in a light-weight container.%6$s\n\n"
a8828ed9
DW		 315 " -h --help Show this help\n"
316 " --version Print version string\n"
69c79d3c 317 " -q --quiet Do not show status information\n"
bb068de0 318 " --no-pager Do not pipe output into a pager\n"
25148653
LP		 319 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
320 "%3$sImage:%4$s\n"
1b9e5b12 321 " -D --directory=PATH Root directory for the container\n"
ec16945e
LP		 322 " --template=PATH Initialize root directory from template directory,\n"
323 " if missing\n"
324 " -x --ephemeral Run container with snapshot of root directory, and\n"
325 " remove it after exit\n"
25e68fd3
LP		 326 " -i --image=PATH Root file system disk image (or device node) for\n"
327 " the container\n"
de40a303 328 " --oci-bundle=PATH OCI bundle directory\n"
25148653
LP		 329 " --read-only Mount the root directory read-only\n"
330 " --volatile[=MODE] Run the system in volatile mode\n"
25e68fd3 331 " --root-hash=HASH Specify verity root hash for root disk image\n"
c2923fdc
LB		 332 " --root-hash-sig=SIG Specify pkcs7 signature of root hash for verity\n"
333 " as a DER encoded PKCS7, either as a path to a file\n"
334 " or as an ASCII base64 encoded string prefixed by\n"
335 " 'base64:'\n"
e7cbe5cb 336 " --verity-data=PATH Specify hash device for verity\n"
25148653
LP		 337 " --pivot-root=PATH[:PATH]\n"
338 " Pivot root to given directory in the container\n\n"
339 "%3$sExecution:%4$s\n"
7732f92b 340 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
a8828ed9 341 " -b --boot Boot up full system (i.e. invoke init)\n"
5f932eb9 342 " --chdir=PATH Set working directory in the container\n"
0d2a0179 343 " -E --setenv=NAME[=VALUE] Pass an environment variable to PID 1\n"
25148653
LP		 344 " -u --user=USER Run the command under specified user or UID\n"
345 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
4a4654e0
LP		 346 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
347 " --suppress-sync=BOOLEAN\n"
348 " Suppress any form of disk data synchronization\n\n"
25148653 349 "%3$sSystem Identity:%4$s\n"
a8828ed9 350 " -M --machine=NAME Set the machine name for the container\n"
3a9530e5 351 " --hostname=NAME Override the hostname for the container\n"
25148653
LP		 352 " --uuid=UUID Set a specific machine UUID for the container\n\n"
353 "%3$sProperties:%4$s\n"
a8828ed9 354 " -S --slice=SLICE Place the container in the specified slice\n"
f36933fe 355 " --property=NAME=VALUE Set scope unit property\n"
25148653
LP		 356 " --register=BOOLEAN Register container as machine\n"
357 " --keep-unit Do not register a scope for the machine, reuse\n"
358 " the service unit nspawn is running in\n\n"
359 "%3$sUser Namespacing:%4$s\n"
90b4a64d 360 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
03cfe0d5 361 " --private-users[=UIDBASE[:NUIDS]]\n"
90b4a64d 362 " Similar, but with user configured UID/GID range\n"
6c045a99
LP		 363 " --private-users-ownership=MODE\n"
364 " Adjust ('chown') or map ('map') OS tree ownership\n"
365 " to private UID/GID range\n\n"
25148653 366 "%3$sNetworking:%4$s\n"
69c79d3c
LP		 367 " --private-network Disable network in container\n"
368 " --network-interface=INTERFACE\n"
369 " Assign an existing network interface to the\n"
370 " container\n"
c74e630d
LP		 371 " --network-macvlan=INTERFACE\n"
372 " Create a macvlan network interface based on an\n"
373 " existing network interface to the container\n"
4bbfe7ad 374 " --network-ipvlan=INTERFACE\n"
387f6955 375 " Create an ipvlan network interface based on an\n"
4bbfe7ad 376 " existing network interface to the container\n"
a8eaaee7 377 " -n --network-veth Add a virtual Ethernet connection between host\n"
69c79d3c 378 " and container\n"
f6d6bad1
LP		 379 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
380 " Add an additional virtual Ethernet link between\n"
381 " host and container\n"
ab046dde 382 " --network-bridge=INTERFACE\n"
90b4a64d
ZJS		 383 " Add a virtual Ethernet connection to the container\n"
384 " and attach it to an existing bridge on the host\n"
385 " --network-zone=NAME Similar, but attach the new interface to an\n"
386 " an automatically managed bridge interface\n"
d7bea6b6
DP		 387 " --network-namespace-path=PATH\n"
388 " Set network namespace to the one represented by\n"
389 " the specified kernel namespace file node\n"
6d0b55c2 390 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
25148653
LP		 391 " Expose a container IP port on the host\n\n"
392 "%3$sSecurity:%4$s\n"
a8828ed9
DW		 393 " --capability=CAP In addition to the default, retain specified\n"
394 " capability\n"
395 " --drop-capability=CAP Drop the specified capability from the default set\n"
88fc9c9b
TH		 396 " --ambient-capability=CAP\n"
397 " Sets the specified capability for the started\n"
398 " process. Not useful if booting a machine.\n"
f4e803c8 399 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
960e4569
LP		 400 " --system-call-filter=LIST|~LIST\n"
401 " Permit/prohibit specific system calls\n"
25148653
LP		 402 " -Z --selinux-context=SECLABEL\n"
403 " Set the SELinux security context to be used by\n"
404 " processes in the container\n"
405 " -L --selinux-apifs-context=SECLABEL\n"
406 " Set the SELinux security context to be used by\n"
407 " API/tmpfs file systems in the container\n\n"
408 "%3$sResources:%4$s\n"
bf428efb 409 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
81f345df
LP		 410 " --oom-score-adjust=VALUE\n"
411 " Adjust the OOM score value for the payload\n"
f4e803c8
LP		 412 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
413 " --personality=ARCH Pick personality for this container\n\n"
25148653 414 "%3$sIntegration:%4$s\n"
09d423e9 415 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
1688841f 416 " --timezone=MODE Select mode of /etc/localtime initialization\n"
25148653
LP		 417 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
418 " host, try-guest, try-host\n"
419 " -j Equivalent to --link-journal=try-guest\n\n"
420 "%3$sMounts:%4$s\n"
5e5bfa6e
EY		 421 " --bind=PATH[:PATH[:OPTIONS]]\n"
422 " Bind mount a file or directory from the host into\n"
a8828ed9 423 " the container\n"
5e5bfa6e
EY		 424 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
425 " Similar, but creates a read-only bind mount\n"
de40a303
LP		 426 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
427 " it\n"
06c17c39 428 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
5a8af538
LP		 429 " --overlay=PATH[:PATH...]:PATH\n"
430 " Create an overlay mount from the host to \n"
431 " the container\n"
432 " --overlay-ro=PATH[:PATH...]:PATH\n"
2f893044
LP		 433 " Similar, but creates a read-only overlay mount\n"
434 " --bind-user=NAME Bind user from host to container\n\n"
25148653 435 "%3$sInput/Output:%4$s\n"
de40a303
LP		 436 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
437 " set up for the container.\n"
3652872a
LP		 438 " -P --pipe Equivalent to --console=pipe\n\n"
439 "%3$sCredentials:%4$s\n"
440 " --set-credential=ID:VALUE\n"
441 " Pass a credential with literal value to container.\n"
442 " --load-credential=ID:PATH\n"
443 " Load credential to pass to container from file or\n"
444 " AF_UNIX stream socket.\n"
bc556335
DDM		 445 "\nSee the %2$s for details.\n",
446 program_invocation_short_name,
447 link,
448 ansi_underline(),
449 ansi_normal(),
450 ansi_highlight(),
451 ansi_normal());
37ec0fdd
LP		 452
453 return 0;
88213476
LP		 454}
455
86c0dd4a 456static int custom_mount_check_all(void) {
88614c8a 457 size_t i;
5a8af538 458
5a8af538
LP		 459 for (i = 0; i < arg_n_custom_mounts; i++) {
460 CustomMount *m = &arg_custom_mounts[i];
461
0de7acce 462 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
6c045a99 463 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_OFF)
baaa35ad 464 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
c920b863 465 "--private-users-ownership=own may not be combined with custom root mounts.");
6c045a99 466 if (arg_uid_shift == UID_INVALID)
baaa35ad
ZJS		 467 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
468 "--private-users with automatic UID shift may not be combined with custom root mounts.");
825d5287 469 }
5a8af538
LP		 470 }
471
472 return 0;
473}
474
8199d554 475static int detect_unified_cgroup_hierarchy_from_environment(void) {
c78c095b 476 const char *e, *var = "SYSTEMD_NSPAWN_UNIFIED_HIERARCHY";
415fc41c 477 int r;
5da38d07 478
efdb0237 479 /* Allow the user to control whether the unified hierarchy is used */
c78c095b
ZJS		 480
481 e = getenv(var);
482 if (!e) {
d5fc5b2f 483 /* $UNIFIED_CGROUP_HIERARCHY has been renamed to $SYSTEMD_NSPAWN_UNIFIED_HIERARCHY. */
c78c095b
ZJS		 484 var = "UNIFIED_CGROUP_HIERARCHY";
485 e = getenv(var);
c78c095b
ZJS		 486 }
487
488 if (!isempty(e)) {
efdb0237
LP		 489 r = parse_boolean(e);
490 if (r < 0)
c78c095b 491 return log_error_errno(r, "Failed to parse $%s: %m", var);
5da38d07
TH		 492 if (r > 0)
493 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
494 else
495 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237
LP		 496 }
497
8199d554
LP		 498 return 0;
499}
500
501static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
502 int r;
503
75b0d8b8
ZJS		 504 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
505 * in the image actually supports. */
b4cccbc1
LP		 506 r = cg_all_unified();
507 if (r < 0)
508 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
509 if (r > 0) {
a8725a06
ZJS		 510 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
511 * routine only detects 231, so we'll have a false negative here for 230. */
512 r = systemd_installation_has_version(directory, 230);
513 if (r < 0)
514 return log_error_errno(r, "Failed to determine systemd version in container: %m");
515 if (r > 0)
516 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
517 else
518 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
c22800e4 519 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
2977724b
TH		 520 /* Mixed cgroup hierarchy support was added in 233 */
521 r = systemd_installation_has_version(directory, 233);
0fd9563f
ZJS		 522 if (r < 0)
523 return log_error_errno(r, "Failed to determine systemd version in container: %m");
524 if (r > 0)
525 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
526 else
527 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
528 } else
5da38d07 529 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
efdb0237 530
8199d554
LP		 531 log_debug("Using %s hierarchy for container.",
532 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_NONE ? "legacy" :
533 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_SYSTEMD ? "hybrid" : "unified");
534
efdb0237
LP		 535 return 0;
536}
537
8a99bd0c
ZJS		 538static int parse_capability_spec(const char *spec, uint64_t *ret_mask) {
539 uint64_t mask = 0;
540 int r;
541
542 for (;;) {
543 _cleanup_free_ char *t = NULL;
544
545 r = extract_first_word(&spec, &t, ",", 0);
546 if (r < 0)
547 return log_error_errno(r, "Failed to parse capability %s.", t);
548 if (r == 0)
549 break;
550
551 if (streq(t, "help")) {
552 for (int i = 0; i < capability_list_length(); i++) {
553 const char *name;
554
555 name = capability_to_name(i);
556 if (name)
557 puts(name);
558 }
559
560 return 0; /* quit */
561 }
562
563 if (streq(t, "all"))
f5fbe71d 564 mask = UINT64_MAX;
8a99bd0c
ZJS		 565 else {
566 r = capability_from_name(t);
567 if (r < 0)
568 return log_error_errno(r, "Failed to parse capability %s.", t);
569
570 mask |= 1ULL << r;
571 }
572 }
573
574 *ret_mask = mask;
575 return 1; /* continue */
576}
577
49048684 578static int parse_share_ns_env(const char *name, unsigned long ns_flag) {
0c582db0
LB		 579 int r;
580
581 r = getenv_bool(name);
582 if (r == -ENXIO)
49048684 583 return 0;
0c582db0 584 if (r < 0)
49048684 585 return log_error_errno(r, "Failed to parse $%s: %m", name);
de40a303 586
0c582db0 587 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
de40a303 588 arg_settings_mask |= SETTING_CLONE_NS_FLAGS;
49048684 589 return 0;
0c582db0
LB		 590}
591
49048684 592static int parse_mount_settings_env(void) {
4f086aab 593 const char *e;
1099ceeb
LP		 594 int r;
595
596 r = getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
49048684
ZJS		 597 if (r < 0 && r != -ENXIO)
598 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP: %m");
1099ceeb
LP		 599 if (r >= 0)
600 SET_FLAG(arg_mount_settings, MOUNT_APPLY_TMPFS_TMP, r > 0);
4f086aab
SU		 601
602 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
49048684 603 if (streq_ptr(e, "network"))
4f086aab 604 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
4f086aab 605
49048684
ZJS		 606 else if (e) {
607 r = parse_boolean(e);
608 if (r < 0)
609 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_API_VFS_WRITABLE: %m");
610
611 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0);
612 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false);
ab8ee0f2 613 }
4f086aab 614
49048684 615 return 0;
4f086aab
SU		 616}
617
49048684 618static int parse_environment(void) {
d5455d2f
LP		 619 const char *e;
620 int r;
621
49048684
ZJS		 622 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
623 if (r < 0)
624 return r;
625 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
626 if (r < 0)
627 return r;
628 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
629 if (r < 0)
630 return r;
631 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
632 if (r < 0)
633 return r;
d5455d2f 634
49048684
ZJS		 635 r = parse_mount_settings_env();
636 if (r < 0)
637 return r;
d5455d2f 638
489fae52
ZJS		 639 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
640 * even if it is supported. If not supported, it has no effect. */
de40a303 641 if (!cg_ns_supported())
489fae52 642 arg_use_cgns = false;
de40a303
LP		 643 else {
644 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
645 if (r < 0) {
646 if (r != -ENXIO)
49048684 647 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS: %m");
de40a303
LP		 648
649 arg_use_cgns = true;
650 } else {
651 arg_use_cgns = r > 0;
652 arg_settings_mask |= SETTING_USE_CGNS;
653 }
654 }
d5455d2f
LP		 655
656 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
657 if (e)
658 arg_container_service_name = e;
659
4a4654e0
LP		 660 r = getenv_bool("SYSTEMD_SUPPRESS_SYNC");
661 if (r >= 0)
662 arg_suppress_sync = r;
663 else if (r != -ENXIO)
664 log_debug_errno(r, "Failed to parse $SYSTEMD_SUPPRESS_SYNC, ignoring: %m");
665
49048684 666 return detect_unified_cgroup_hierarchy_from_environment();
d5455d2f
LP		 667}
668
88213476 669static int parse_argv(int argc, char *argv[]) {
a41fe3a2 670 enum {
acbeb427
ZJS		 671 ARG_VERSION = 0x100,
672 ARG_PRIVATE_NETWORK,
bc2f673e 673 ARG_UUID,
5076f0cc 674 ARG_READ_ONLY,
57fb9fb5 675 ARG_CAPABILITY,
88fc9c9b 676 ARG_AMBIENT_CAPABILITY,
420c7379 677 ARG_DROP_CAPABILITY,
17fe0523
LP		 678 ARG_LINK_JOURNAL,
679 ARG_BIND,
f4889f65 680 ARG_BIND_RO,
06c17c39 681 ARG_TMPFS,
5a8af538
LP		 682 ARG_OVERLAY,
683 ARG_OVERLAY_RO,
de40a303 684 ARG_INACCESSIBLE,
eb91eb18 685 ARG_SHARE_SYSTEM,
89f7c846 686 ARG_REGISTER,
aa28aefe 687 ARG_KEEP_UNIT,
69c79d3c 688 ARG_NETWORK_INTERFACE,
c74e630d 689 ARG_NETWORK_MACVLAN,
4bbfe7ad 690 ARG_NETWORK_IPVLAN,
ab046dde 691 ARG_NETWORK_BRIDGE,
22b28dfd 692 ARG_NETWORK_ZONE,
f6d6bad1 693 ARG_NETWORK_VETH_EXTRA,
d7bea6b6 694 ARG_NETWORK_NAMESPACE_PATH,
6afc95b7 695 ARG_PERSONALITY,
4d9f07b4 696 ARG_VOLATILE,
ec16945e 697 ARG_TEMPLATE,
f36933fe 698 ARG_PROPERTY,
6dac160c 699 ARG_PRIVATE_USERS,
c6c8f6e2 700 ARG_KILL_SIGNAL,
f757855e 701 ARG_SETTINGS,
5f932eb9 702 ARG_CHDIR,
b53ede69 703 ARG_PIVOT_ROOT,
7336138e 704 ARG_PRIVATE_USERS_CHOWN,
6c045a99 705 ARG_PRIVATE_USERS_OWNERSHIP,
9c1e04d0 706 ARG_NOTIFY_READY,
4623e8e6 707 ARG_ROOT_HASH,
89e62e0b
LP		 708 ARG_ROOT_HASH_SIG,
709 ARG_VERITY_DATA,
960e4569 710 ARG_SYSTEM_CALL_FILTER,
bf428efb 711 ARG_RLIMIT,
3a9530e5 712 ARG_HOSTNAME,
66edd963 713 ARG_NO_NEW_PRIVILEGES,
81f345df 714 ARG_OOM_SCORE_ADJUST,
d107bb7d 715 ARG_CPU_AFFINITY,
09d423e9 716 ARG_RESOLV_CONF,
1688841f 717 ARG_TIMEZONE,
de40a303
LP		 718 ARG_CONSOLE,
719 ARG_PIPE,
720 ARG_OCI_BUNDLE,
bb068de0 721 ARG_NO_PAGER,
3652872a
LP		 722 ARG_SET_CREDENTIAL,
723 ARG_LOAD_CREDENTIAL,
2f893044 724 ARG_BIND_USER,
4a4654e0 725 ARG_SUPPRESS_SYNC,
a41fe3a2
LP		 726 };
727
88213476 728 static const struct option options[] = {
d7bea6b6
DP		 729 { "help", no_argument, NULL, 'h' },
730 { "version", no_argument, NULL, ARG_VERSION },
731 { "directory", required_argument, NULL, 'D' },
732 { "template", required_argument, NULL, ARG_TEMPLATE },
733 { "ephemeral", no_argument, NULL, 'x' },
734 { "user", required_argument, NULL, 'u' },
735 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
736 { "as-pid2", no_argument, NULL, 'a' },
737 { "boot", no_argument, NULL, 'b' },
738 { "uuid", required_argument, NULL, ARG_UUID },
739 { "read-only", no_argument, NULL, ARG_READ_ONLY },
740 { "capability", required_argument, NULL, ARG_CAPABILITY },
88fc9c9b 741 { "ambient-capability", required_argument, NULL, ARG_AMBIENT_CAPABILITY },
d7bea6b6 742 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
66edd963 743 { "no-new-privileges", required_argument, NULL, ARG_NO_NEW_PRIVILEGES },
d7bea6b6
DP		 744 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
745 { "bind", required_argument, NULL, ARG_BIND },
746 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
747 { "tmpfs", required_argument, NULL, ARG_TMPFS },
748 { "overlay", required_argument, NULL, ARG_OVERLAY },
749 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
de40a303 750 { "inaccessible", required_argument, NULL, ARG_INACCESSIBLE },
d7bea6b6 751 { "machine", required_argument, NULL, 'M' },
3a9530e5 752 { "hostname", required_argument, NULL, ARG_HOSTNAME },
d7bea6b6
DP		 753 { "slice", required_argument, NULL, 'S' },
754 { "setenv", required_argument, NULL, 'E' },
755 { "selinux-context", required_argument, NULL, 'Z' },
756 { "selinux-apifs-context", required_argument, NULL, 'L' },
757 { "quiet", no_argument, NULL, 'q' },
758 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
759 { "register", required_argument, NULL, ARG_REGISTER },
760 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
761 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
762 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
763 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
764 { "network-veth", no_argument, NULL, 'n' },
765 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
766 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
767 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
768 { "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH },
769 { "personality", required_argument, NULL, ARG_PERSONALITY },
770 { "image", required_argument, NULL, 'i' },
771 { "volatile", optional_argument, NULL, ARG_VOLATILE },
772 { "port", required_argument, NULL, 'p' },
773 { "property", required_argument, NULL, ARG_PROPERTY },
774 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
6c045a99
LP		 775 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN }, /* obsolete */
776 { "private-users-ownership",required_argument, NULL, ARG_PRIVATE_USERS_OWNERSHIP},
d7bea6b6
DP		 777 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
778 { "settings", required_argument, NULL, ARG_SETTINGS },
779 { "chdir", required_argument, NULL, ARG_CHDIR },
780 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
781 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
782 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
89e62e0b
LP		 783 { "root-hash-sig", required_argument, NULL, ARG_ROOT_HASH_SIG },
784 { "verity-data", required_argument, NULL, ARG_VERITY_DATA },
d7bea6b6 785 { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
bf428efb 786 { "rlimit", required_argument, NULL, ARG_RLIMIT },
81f345df 787 { "oom-score-adjust", required_argument, NULL, ARG_OOM_SCORE_ADJUST },
d107bb7d 788 { "cpu-affinity", required_argument, NULL, ARG_CPU_AFFINITY },
09d423e9 789 { "resolv-conf", required_argument, NULL, ARG_RESOLV_CONF },
1688841f 790 { "timezone", required_argument, NULL, ARG_TIMEZONE },
de40a303
LP		 791 { "console", required_argument, NULL, ARG_CONSOLE },
792 { "pipe", no_argument, NULL, ARG_PIPE },
793 { "oci-bundle", required_argument, NULL, ARG_OCI_BUNDLE },
bb068de0 794 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
3652872a
LP		 795 { "set-credential", required_argument, NULL, ARG_SET_CREDENTIAL },
796 { "load-credential", required_argument, NULL, ARG_LOAD_CREDENTIAL },
2f893044 797 { "bind-user", required_argument, NULL, ARG_BIND_USER },
4a4654e0 798 { "suppress-sync", required_argument, NULL, ARG_SUPPRESS_SYNC },
eb9da376 799 {}
88213476
LP		 800 };
801
9444b1f2 802 int c, r;
a42c8b54 803 uint64_t plus = 0, minus = 0;
f757855e 804 bool mask_all_settings = false, mask_no_settings = false;
88213476
LP		 805
806 assert(argc >= 0);
807 assert(argv);
808
de40a303 809 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0)
88213476
LP		 810 switch (c) {
811
812 case 'h':
37ec0fdd 813 return help();
88213476 814
acbeb427 815 case ARG_VERSION:
3f6fd1ba 816 return version();
acbeb427 817
88213476 818 case 'D':
614b022c 819 r = parse_path_argument(optarg, false, &arg_directory);
ec16945e 820 if (r < 0)
0f03c2a4 821 return r;
de40a303
LP		 822
823 arg_settings_mask |= SETTING_DIRECTORY;
ec16945e
LP		 824 break;
825
826 case ARG_TEMPLATE:
614b022c 827 r = parse_path_argument(optarg, false, &arg_template);
ec16945e 828 if (r < 0)
0f03c2a4 829 return r;
de40a303
LP		 830
831 arg_settings_mask |= SETTING_DIRECTORY;
88213476
LP		 832 break;
833
1b9e5b12 834 case 'i':
614b022c 835 r = parse_path_argument(optarg, false, &arg_image);
ec16945e 836 if (r < 0)
0f03c2a4 837 return r;
de40a303
LP		 838
839 arg_settings_mask |= SETTING_DIRECTORY;
840 break;
841
842 case ARG_OCI_BUNDLE:
614b022c 843 r = parse_path_argument(optarg, false, &arg_oci_bundle);
de40a303
LP		 844 if (r < 0)
845 return r;
846
ec16945e
LP		 847 break;
848
849 case 'x':
850 arg_ephemeral = true;
a2f577fc 851 arg_settings_mask |= SETTING_EPHEMERAL;
1b9e5b12
LP		 852 break;
853
687d0825 854 case 'u':
2fc09a9c
DM		 855 r = free_and_strdup(&arg_user, optarg);
856 if (r < 0)
7027ff61 857 return log_oom();
687d0825 858
f757855e 859 arg_settings_mask |= SETTING_USER;
687d0825
MV		 860 break;
861
22b28dfd
LP		 862 case ARG_NETWORK_ZONE: {
863 char *j;
864
b910cc72 865 j = strjoin("vz-", optarg);
22b28dfd
LP		 866 if (!j)
867 return log_oom();
868
869 if (!ifname_valid(j)) {
870 log_error("Network zone name not valid: %s", j);
871 free(j);
872 return -EINVAL;
873 }
874
df1fac6d 875 free_and_replace(arg_network_zone, j);
22b28dfd
LP		 876
877 arg_network_veth = true;
878 arg_private_network = true;
879 arg_settings_mask |= SETTING_NETWORK;
880 break;
881 }
882
ab046dde 883 case ARG_NETWORK_BRIDGE:
ef76dff2 884
baaa35ad
ZJS		 885 if (!ifname_valid(optarg))
886 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
887 "Bridge interface name not valid: %s", optarg);
ef76dff2 888
f757855e
LP		 889 r = free_and_strdup(&arg_network_bridge, optarg);
890 if (r < 0)
891 return log_oom();
ab046dde 892
4831981d 893 _fallthrough_;
0dfaa006 894 case 'n':
69c79d3c
LP		 895 arg_network_veth = true;
896 arg_private_network = true;
f757855e 897 arg_settings_mask |= SETTING_NETWORK;
69c79d3c
LP		 898 break;
899
f6d6bad1
LP		 900 case ARG_NETWORK_VETH_EXTRA:
901 r = veth_extra_parse(&arg_network_veth_extra, optarg);
902 if (r < 0)
903 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
904
905 arg_private_network = true;
906 arg_settings_mask |= SETTING_NETWORK;
907 break;
908
aa28aefe 909 case ARG_NETWORK_INTERFACE:
baaa35ad
ZJS		 910 if (!ifname_valid(optarg))
911 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
912 "Network interface name not valid: %s", optarg);
ef76dff2 913
b390f178
DDM		 914 r = test_network_interface_initialized(optarg);
915 if (r < 0)
916 return r;
917
c74e630d
LP		 918 if (strv_extend(&arg_network_interfaces, optarg) < 0)
919 return log_oom();
920
921 arg_private_network = true;
f757855e 922 arg_settings_mask |= SETTING_NETWORK;
c74e630d
LP		 923 break;
924
925 case ARG_NETWORK_MACVLAN:
ef76dff2 926
baaa35ad
ZJS		 927 if (!ifname_valid(optarg))
928 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
929 "MACVLAN network interface name not valid: %s", optarg);
ef76dff2 930
b390f178
DDM		 931 r = test_network_interface_initialized(optarg);
932 if (r < 0)
933 return r;
934
c74e630d 935 if (strv_extend(&arg_network_macvlan, optarg) < 0)
aa28aefe
LP		 936 return log_oom();
937
4bbfe7ad 938 arg_private_network = true;
f757855e 939 arg_settings_mask |= SETTING_NETWORK;
4bbfe7ad
TG		 940 break;
941
942 case ARG_NETWORK_IPVLAN:
ef76dff2 943
baaa35ad
ZJS		 944 if (!ifname_valid(optarg))
945 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
946 "IPVLAN network interface name not valid: %s", optarg);
ef76dff2 947
b390f178
DDM		 948 r = test_network_interface_initialized(optarg);
949 if (r < 0)
950 return r;
951
4bbfe7ad
TG		 952 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
953 return log_oom();
954
4831981d 955 _fallthrough_;
ff01d048
LP		 956 case ARG_PRIVATE_NETWORK:
957 arg_private_network = true;
f757855e 958 arg_settings_mask |= SETTING_NETWORK;
a41fe3a2
LP		 959 break;
960
d7bea6b6 961 case ARG_NETWORK_NAMESPACE_PATH:
614b022c 962 r = parse_path_argument(optarg, false, &arg_network_namespace_path);
d7bea6b6
DP		 963 if (r < 0)
964 return r;
965
de40a303 966 arg_settings_mask |= SETTING_NETWORK;
d7bea6b6
DP		 967 break;
968
0f0dbc46 969 case 'b':
baaa35ad
ZJS		 970 if (arg_start_mode == START_PID2)
971 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
972 "--boot and --as-pid2 may not be combined.");
7732f92b
LP		 973
974 arg_start_mode = START_BOOT;
975 arg_settings_mask |= SETTING_START_MODE;
976 break;
977
978 case 'a':
baaa35ad
ZJS		 979 if (arg_start_mode == START_BOOT)
980 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
981 "--boot and --as-pid2 may not be combined.");
7732f92b
LP		 982
983 arg_start_mode = START_PID2;
984 arg_settings_mask |= SETTING_START_MODE;
0f0dbc46
LP		 985 break;
986
144f0fc0 987 case ARG_UUID:
9444b1f2 988 r = sd_id128_from_string(optarg, &arg_uuid);
317feb4d
LP		 989 if (r < 0)
990 return log_error_errno(r, "Invalid UUID: %s", optarg);
991
baaa35ad
ZJS		 992 if (sd_id128_is_null(arg_uuid))
993 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
994 "Machine UUID may not be all zeroes.");
f757855e
LP		 995
996 arg_settings_mask |= SETTING_MACHINE_ID;
9444b1f2 997 break;
aa96c6cb 998
43c3fb46
LP		 999 case 'S': {
1000 _cleanup_free_ char *mangled = NULL;
1001
1002 r = unit_name_mangle_with_suffix(optarg, NULL, UNIT_NAME_MANGLE_WARN, ".slice", &mangled);
de40a303
LP		 1003 if (r < 0)
1004 return log_oom();
1005
43c3fb46 1006 free_and_replace(arg_slice, mangled);
de40a303 1007 arg_settings_mask |= SETTING_SLICE;
144f0fc0 1008 break;
43c3fb46 1009 }
144f0fc0 1010
7027ff61 1011 case 'M':
c1521918 1012 if (isempty(optarg))
97b11eed 1013 arg_machine = mfree(arg_machine);
c1521918 1014 else {
52ef5dd7 1015 if (!hostname_is_valid(optarg, 0))
baaa35ad
ZJS		 1016 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1017 "Invalid machine name: %s", optarg);
7027ff61 1018
0c3c4284
LP		 1019 r = free_and_strdup(&arg_machine, optarg);
1020 if (r < 0)
eb91eb18 1021 return log_oom();
eb91eb18 1022 }
9ce6d1b3 1023 break;
7027ff61 1024
3a9530e5
LP		 1025 case ARG_HOSTNAME:
1026 if (isempty(optarg))
1027 arg_hostname = mfree(arg_hostname);
1028 else {
52ef5dd7 1029 if (!hostname_is_valid(optarg, 0))
baaa35ad
ZJS		 1030 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1031 "Invalid hostname: %s", optarg);
3a9530e5
LP		 1032
1033 r = free_and_strdup(&arg_hostname, optarg);
1034 if (r < 0)
1035 return log_oom();
1036 }
1037
1038 arg_settings_mask |= SETTING_HOSTNAME;
1039 break;
1040
82adf6af
LP		 1041 case 'Z':
1042 arg_selinux_context = optarg;
a8828ed9
DW		 1043 break;
1044
82adf6af
LP		 1045 case 'L':
1046 arg_selinux_apifs_context = optarg;
a8828ed9
DW		 1047 break;
1048
bc2f673e
LP		 1049 case ARG_READ_ONLY:
1050 arg_read_only = true;
f757855e 1051 arg_settings_mask |= SETTING_READ_ONLY;
bc2f673e
LP		 1052 break;
1053
88fc9c9b
TH		 1054 case ARG_AMBIENT_CAPABILITY: {
1055 uint64_t m;
1056 r = parse_capability_spec(optarg, &m);
1057 if (r <= 0)
1058 return r;
1059 arg_caps_ambient |= m;
1060 arg_settings_mask |= SETTING_CAPABILITY;
1061 break;
1062 }
420c7379
LP		 1063 case ARG_CAPABILITY:
1064 case ARG_DROP_CAPABILITY: {
8a99bd0c
ZJS		 1065 uint64_t m;
1066 r = parse_capability_spec(optarg, &m);
1067 if (r <= 0)
1068 return r;
5076f0cc 1069
8a99bd0c
ZJS		 1070 if (c == ARG_CAPABILITY)
1071 plus |= m;
1072 else
1073 minus |= m;
f757855e 1074 arg_settings_mask |= SETTING_CAPABILITY;
5076f0cc
LP		 1075 break;
1076 }
66edd963
LP		 1077 case ARG_NO_NEW_PRIVILEGES:
1078 r = parse_boolean(optarg);
1079 if (r < 0)
1080 return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg);
1081
1082 arg_no_new_privileges = r;
1083 arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES;
1084 break;
1085
57fb9fb5
LP		 1086 case 'j':
1087 arg_link_journal = LINK_GUEST;
574edc90 1088 arg_link_journal_try = true;
4e1d6aa9 1089 arg_settings_mask |= SETTING_LINK_JOURNAL;
57fb9fb5
LP		 1090 break;
1091
1092 case ARG_LINK_JOURNAL:
4e1d6aa9 1093 r = parse_link_journal(optarg, &arg_link_journal, &arg_link_journal_try);
c6147113
LP		 1094 if (r < 0)
1095 return log_error_errno(r, "Failed to parse link journal mode %s", optarg);
57fb9fb5 1096
4e1d6aa9 1097 arg_settings_mask |= SETTING_LINK_JOURNAL;
57fb9fb5
LP		 1098 break;
1099
17fe0523 1100 case ARG_BIND:
f757855e
LP		 1101 case ARG_BIND_RO:
1102 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
1103 if (r < 0)
1104 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
17fe0523 1105
f757855e 1106 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
17fe0523 1107 break;
06c17c39 1108
f757855e
LP		 1109 case ARG_TMPFS:
1110 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1111 if (r < 0)
1112 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
5a8af538 1113
f757855e 1114 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
5a8af538 1115 break;
5a8af538
LP		 1116
1117 case ARG_OVERLAY:
ad85779a
LP		 1118 case ARG_OVERLAY_RO:
1119 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
1120 if (r == -EADDRNOTAVAIL)
1121 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
1122 if (r < 0)
1123 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
06c17c39 1124
f757855e 1125 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
06c17c39 1126 break;
06c17c39 1127
de40a303
LP		 1128 case ARG_INACCESSIBLE:
1129 r = inaccessible_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1130 if (r < 0)
1131 return log_error_errno(r, "Failed to parse --inaccessible= argument %s: %m", optarg);
1132
1133 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1134 break;
1135
0d2a0179
ZJS		 1136 case 'E':
1137 r = strv_env_replace_strdup_passthrough(&arg_setenv, optarg);
aaf057c4 1138 if (r < 0)
0d2a0179 1139 return log_error_errno(r, "Cannot assign environment variable %s: %m", optarg);
f4889f65 1140
f757855e 1141 arg_settings_mask |= SETTING_ENVIRONMENT;
f4889f65 1142 break;
f4889f65 1143
284c0b91
LP		 1144 case 'q':
1145 arg_quiet = true;
1146 break;
1147
8a96d94e 1148 case ARG_SHARE_SYSTEM:
a6b5216c 1149 /* We don't officially support this anymore, except for compat reasons. People should use the
0c582db0 1150 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
63d1c29f 1151 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
0c582db0 1152 arg_clone_ns_flags = 0;
8a96d94e
LP		 1153 break;
1154
eb91eb18
LP		 1155 case ARG_REGISTER:
1156 r = parse_boolean(optarg);
1157 if (r < 0) {
1158 log_error("Failed to parse --register= argument: %s", optarg);
1159 return r;
1160 }
1161
1162 arg_register = r;
1163 break;
1164
89f7c846
LP		 1165 case ARG_KEEP_UNIT:
1166 arg_keep_unit = true;
1167 break;
1168
6afc95b7
LP		 1169 case ARG_PERSONALITY:
1170
ac45f971 1171 arg_personality = personality_from_string(optarg);
baaa35ad
ZJS		 1172 if (arg_personality == PERSONALITY_INVALID)
1173 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1174 "Unknown or unsupported personality '%s'.", optarg);
6afc95b7 1175
f757855e 1176 arg_settings_mask |= SETTING_PERSONALITY;
6afc95b7
LP		 1177 break;
1178
4d9f07b4
LP		 1179 case ARG_VOLATILE:
1180
1181 if (!optarg)
f757855e 1182 arg_volatile_mode = VOLATILE_YES;
5c828e66
LP		 1183 else if (streq(optarg, "help")) {
1184 DUMP_STRING_TABLE(volatile_mode, VolatileMode, _VOLATILE_MODE_MAX);
1185 return 0;
1186 } else {
f757855e 1187 VolatileMode m;
4d9f07b4 1188
f757855e 1189 m = volatile_mode_from_string(optarg);
baaa35ad
ZJS		 1190 if (m < 0)
1191 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1192 "Failed to parse --volatile= argument: %s", optarg);
1193 else
f757855e 1194 arg_volatile_mode = m;
6d0b55c2
LP		 1195 }
1196
f757855e
LP		 1197 arg_settings_mask |= SETTING_VOLATILE_MODE;
1198 break;
6d0b55c2 1199
f757855e
LP		 1200 case 'p':
1201 r = expose_port_parse(&arg_expose_ports, optarg);
1202 if (r == -EEXIST)
1203 return log_error_errno(r, "Duplicate port specification: %s", optarg);
1204 if (r < 0)
1205 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
6d0b55c2 1206
f757855e 1207 arg_settings_mask |= SETTING_EXPOSE_PORTS;
6d0b55c2 1208 break;
6d0b55c2 1209
f36933fe
LP		 1210 case ARG_PROPERTY:
1211 if (strv_extend(&arg_property, optarg) < 0)
1212 return log_oom();
1213
1214 break;
1215
ae209204 1216 case ARG_PRIVATE_USERS: {
33eac552 1217 int boolean;
0de7acce 1218
ae209204
ZJS		 1219 if (!optarg)
1220 boolean = true;
1221 else if (!in_charset(optarg, DIGITS))
1222 /* do *not* parse numbers as booleans */
1223 boolean = parse_boolean(optarg);
33eac552
LP		 1224 else
1225 boolean = -1;
ae209204 1226
33eac552 1227 if (boolean == 0) {
0de7acce
LP		 1228 /* no: User namespacing off */
1229 arg_userns_mode = USER_NAMESPACE_NO;
1230 arg_uid_shift = UID_INVALID;
1231 arg_uid_range = UINT32_C(0x10000);
33eac552 1232 } else if (boolean > 0) {
0de7acce
LP		 1233 /* yes: User namespacing on, UID range is read from root dir */
1234 arg_userns_mode = USER_NAMESPACE_FIXED;
1235 arg_uid_shift = UID_INVALID;
1236 arg_uid_range = UINT32_C(0x10000);
1237 } else if (streq(optarg, "pick")) {
1238 /* pick: User namespacing on, UID range is picked randomly */
6c045a99
LP		 1239 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1240 * implied by USER_NAMESPACE_PICK
33eac552 1241 * further down. */
0de7acce
LP		 1242 arg_uid_shift = UID_INVALID;
1243 arg_uid_range = UINT32_C(0x10000);
33eac552
LP		 1244
1245 } else if (streq(optarg, "identity")) {
1246 /* identitiy: User namespaces on, UID range is map the 0…0xFFFF range to
1247 * itself, i.e. we don't actually map anything, but do take benefit of
1248 * isolation of capability sets. */
1249 arg_userns_mode = USER_NAMESPACE_FIXED;
1250 arg_uid_shift = 0;
1251 arg_uid_range = UINT32_C(0x10000);
0de7acce 1252 } else {
6c2058b3 1253 _cleanup_free_ char *buffer = NULL;
6dac160c
LP		 1254 const char *range, *shift;
1255
0de7acce
LP		 1256 /* anything else: User namespacing on, UID range is explicitly configured */
1257
6dac160c
LP		 1258 range = strchr(optarg, ':');
1259 if (range) {
6c2058b3
ZJS		 1260 buffer = strndup(optarg, range - optarg);
1261 if (!buffer)
1262 return log_oom();
1263 shift = buffer;
6dac160c
LP		 1264
1265 range++;
bfd292ec
ZJS		 1266 r = safe_atou32(range, &arg_uid_range);
1267 if (r < 0)
be715731 1268 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
6dac160c
LP		 1269 } else
1270 shift = optarg;
1271
be715731
ZJS		 1272 r = parse_uid(shift, &arg_uid_shift);
1273 if (r < 0)
1274 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
0de7acce
LP		 1275
1276 arg_userns_mode = USER_NAMESPACE_FIXED;
6dac160c 1277
58e13de5
LP		 1278 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
1279 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID range cannot be empty or go beyond " UID_FMT ".", UID_INVALID);
1280 }
be715731 1281
0de7acce 1282 arg_settings_mask |= SETTING_USERNS;
6dac160c 1283 break;
ae209204 1284 }
6dac160c 1285
0de7acce 1286 case 'U':
ccabee0d 1287 if (userns_supported()) {
6c045a99
LP		 1288 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1289 * implied by USER_NAMESPACE_PICK
33eac552 1290 * further down. */
ccabee0d
LP		 1291 arg_uid_shift = UID_INVALID;
1292 arg_uid_range = UINT32_C(0x10000);
1293
1294 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 1295 }
1296
7336138e
LP		 1297 break;
1298
0de7acce 1299 case ARG_PRIVATE_USERS_CHOWN:
6c045a99
LP		 1300 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
1301
1302 arg_settings_mask |= SETTING_USERNS;
1303 break;
1304
1305 case ARG_PRIVATE_USERS_OWNERSHIP:
1306 if (streq(optarg, "help")) {
1307 DUMP_STRING_TABLE(user_namespace_ownership, UserNamespaceOwnership, _USER_NAMESPACE_OWNERSHIP_MAX);
1308 return 0;
1309 }
1310
1311 arg_userns_ownership = user_namespace_ownership_from_string(optarg);
1312 if (arg_userns_ownership < 0)
1313 return log_error_errno(arg_userns_ownership, "Cannot parse --user-namespace-ownership= value: %s", optarg);
0de7acce
LP		 1314
1315 arg_settings_mask |= SETTING_USERNS;
6dac160c
LP		 1316 break;
1317
c6c8f6e2 1318 case ARG_KILL_SIGNAL:
5c828e66
LP		 1319 if (streq(optarg, "help")) {
1320 DUMP_STRING_TABLE(signal, int, _NSIG);
1321 return 0;
1322 }
1323
29a3db75 1324 arg_kill_signal = signal_from_string(optarg);
baaa35ad 1325 if (arg_kill_signal < 0)
7211c853 1326 return log_error_errno(arg_kill_signal, "Cannot parse signal: %s", optarg);
c6c8f6e2 1327
f757855e
LP		 1328 arg_settings_mask |= SETTING_KILL_SIGNAL;
1329 break;
1330
1331 case ARG_SETTINGS:
1332
1333 /* no → do not read files
1334 * yes → read files, do not override cmdline, trust only subset
1335 * override → read files, override cmdline, trust only subset
1336 * trusted → read files, do not override cmdline, trust all
1337 */
1338
1339 r = parse_boolean(optarg);
1340 if (r < 0) {
1341 if (streq(optarg, "trusted")) {
1342 mask_all_settings = false;
1343 mask_no_settings = false;
1344 arg_settings_trusted = true;
1345
1346 } else if (streq(optarg, "override")) {
1347 mask_all_settings = false;
1348 mask_no_settings = true;
1349 arg_settings_trusted = -1;
1350 } else
1351 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
1352 } else if (r > 0) {
1353 /* yes */
1354 mask_all_settings = false;
1355 mask_no_settings = false;
1356 arg_settings_trusted = -1;
1357 } else {
1358 /* no */
1359 mask_all_settings = true;
1360 mask_no_settings = false;
1361 arg_settings_trusted = false;
1362 }
1363
c6c8f6e2
LP		 1364 break;
1365
5f932eb9 1366 case ARG_CHDIR:
baaa35ad
ZJS		 1367 if (!path_is_absolute(optarg))
1368 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1369 "Working directory %s is not an absolute path.", optarg);
5f932eb9
LP		 1370
1371 r = free_and_strdup(&arg_chdir, optarg);
1372 if (r < 0)
1373 return log_oom();
1374
1375 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1376 break;
1377
b53ede69
PW		 1378 case ARG_PIVOT_ROOT:
1379 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1380 if (r < 0)
1381 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1382
1383 arg_settings_mask |= SETTING_PIVOT_ROOT;
1384 break;
1385
9c1e04d0
AP		 1386 case ARG_NOTIFY_READY:
1387 r = parse_boolean(optarg);
baaa35ad
ZJS		 1388 if (r < 0)
1389 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1390 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
9c1e04d0
AP		 1391 arg_notify_ready = r;
1392 arg_settings_mask |= SETTING_NOTIFY_READY;
1393 break;
1394
4623e8e6 1395 case ARG_ROOT_HASH: {
89e62e0b 1396 _cleanup_free_ void *k = NULL;
4623e8e6
LP		 1397 size_t l;
1398
1399 r = unhexmem(optarg, strlen(optarg), &k, &l);
1400 if (r < 0)
1401 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
89e62e0b 1402 if (l < sizeof(sd_id128_t))
c6147113 1403 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg);
4623e8e6 1404
89e62e0b
LP		 1405 free_and_replace(arg_verity_settings.root_hash, k);
1406 arg_verity_settings.root_hash_size = l;
4623e8e6
LP		 1407 break;
1408 }
1409
c2923fdc
LB		 1410 case ARG_ROOT_HASH_SIG: {
1411 char *value;
89e62e0b
LP		 1412 size_t l;
1413 void *p;
c2923fdc
LB		 1414
1415 if ((value = startswith(optarg, "base64:"))) {
c2923fdc
LB		 1416 r = unbase64mem(value, strlen(value), &p, &l);
1417 if (r < 0)
1418 return log_error_errno(r, "Failed to parse root hash signature '%s': %m", optarg);
1419
c2923fdc 1420 } else {
89e62e0b 1421 r = read_full_file(optarg, (char**) &p, &l);
c2923fdc 1422 if (r < 0)
89e62e0b 1423 return log_error_errno(r, "Failed parse root hash signature file '%s': %m", optarg);
c2923fdc
LB		 1424 }
1425
89e62e0b
LP		 1426 free_and_replace(arg_verity_settings.root_hash_sig, p);
1427 arg_verity_settings.root_hash_sig_size = l;
c2923fdc
LB		 1428 break;
1429 }
1430
89e62e0b 1431 case ARG_VERITY_DATA:
614b022c 1432 r = parse_path_argument(optarg, false, &arg_verity_settings.data_path);
89e62e0b
LP		 1433 if (r < 0)
1434 return r;
1435 break;
1436
960e4569
LP		 1437 case ARG_SYSTEM_CALL_FILTER: {
1438 bool negative;
1439 const char *items;
1440
1441 negative = optarg[0] == '~';
1442 items = negative ? optarg + 1 : optarg;
1443
1444 for (;;) {
1445 _cleanup_free_ char *word = NULL;
1446
1447 r = extract_first_word(&items, &word, NULL, 0);
1448 if (r == 0)
1449 break;
1450 if (r == -ENOMEM)
1451 return log_oom();
1452 if (r < 0)
1453 return log_error_errno(r, "Failed to parse system call filter: %m");
1454
1455 if (negative)
6b000af4 1456 r = strv_extend(&arg_syscall_deny_list, word);
960e4569 1457 else
6b000af4 1458 r = strv_extend(&arg_syscall_allow_list, word);
960e4569
LP		 1459 if (r < 0)
1460 return log_oom();
1461 }
1462
1463 arg_settings_mask |= SETTING_SYSCALL_FILTER;
1464 break;
1465 }
1466
bf428efb
LP		 1467 case ARG_RLIMIT: {
1468 const char *eq;
622ecfa8 1469 _cleanup_free_ char *name = NULL;
bf428efb
LP		 1470 int rl;
1471
5c828e66
LP		 1472 if (streq(optarg, "help")) {
1473 DUMP_STRING_TABLE(rlimit, int, _RLIMIT_MAX);
1474 return 0;
1475 }
1476
bf428efb 1477 eq = strchr(optarg, '=');
baaa35ad
ZJS		 1478 if (!eq)
1479 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1480 "--rlimit= expects an '=' assignment.");
bf428efb
LP		 1481
1482 name = strndup(optarg, eq - optarg);
1483 if (!name)
1484 return log_oom();
1485
1486 rl = rlimit_from_string_harder(name);
baaa35ad 1487 if (rl < 0)
7211c853 1488 return log_error_errno(rl, "Unknown resource limit: %s", name);
bf428efb
LP		 1489
1490 if (!arg_rlimit[rl]) {
1491 arg_rlimit[rl] = new0(struct rlimit, 1);
1492 if (!arg_rlimit[rl])
1493 return log_oom();
1494 }
1495
1496 r = rlimit_parse(rl, eq + 1, arg_rlimit[rl]);
1497 if (r < 0)
1498 return log_error_errno(r, "Failed to parse resource limit: %s", eq + 1);
1499
1500 arg_settings_mask |= SETTING_RLIMIT_FIRST << rl;
1501 break;
1502 }
1503
81f345df
LP		 1504 case ARG_OOM_SCORE_ADJUST:
1505 r = parse_oom_score_adjust(optarg, &arg_oom_score_adjust);
1506 if (r < 0)
1507 return log_error_errno(r, "Failed to parse --oom-score-adjust= parameter: %s", optarg);
1508
1509 arg_oom_score_adjust_set = true;
1510 arg_settings_mask |= SETTING_OOM_SCORE_ADJUST;
1511 break;
1512
d107bb7d 1513 case ARG_CPU_AFFINITY: {
0985c7c4 1514 CPUSet cpuset;
d107bb7d
LP		 1515
1516 r = parse_cpu_set(optarg, &cpuset);
1517 if (r < 0)
0985c7c4 1518 return log_error_errno(r, "Failed to parse CPU affinity mask %s: %m", optarg);
d107bb7d 1519
0985c7c4
ZJS		 1520 cpu_set_reset(&arg_cpu_set);
1521 arg_cpu_set = cpuset;
d107bb7d
LP		 1522 arg_settings_mask |= SETTING_CPU_AFFINITY;
1523 break;
1524 }
1525
09d423e9
LP		 1526 case ARG_RESOLV_CONF:
1527 if (streq(optarg, "help")) {
1528 DUMP_STRING_TABLE(resolv_conf_mode, ResolvConfMode, _RESOLV_CONF_MODE_MAX);
1529 return 0;
1530 }
1531
1532 arg_resolv_conf = resolv_conf_mode_from_string(optarg);
baaa35ad 1533 if (arg_resolv_conf < 0)
7211c853 1534 return log_error_errno(arg_resolv_conf,
baaa35ad 1535 "Failed to parse /etc/resolv.conf mode: %s", optarg);
09d423e9
LP		 1536
1537 arg_settings_mask |= SETTING_RESOLV_CONF;
1538 break;
1539
1688841f
LP		 1540 case ARG_TIMEZONE:
1541 if (streq(optarg, "help")) {
1542 DUMP_STRING_TABLE(timezone_mode, TimezoneMode, _TIMEZONE_MODE_MAX);
1543 return 0;
1544 }
1545
1546 arg_timezone = timezone_mode_from_string(optarg);
baaa35ad 1547 if (arg_timezone < 0)
7211c853 1548 return log_error_errno(arg_timezone,
baaa35ad 1549 "Failed to parse /etc/localtime mode: %s", optarg);
1688841f
LP		 1550
1551 arg_settings_mask |= SETTING_TIMEZONE;
1552 break;
1553
de40a303 1554 case ARG_CONSOLE:
dce66ffe
ZJS		 1555 r = handle_arg_console(optarg);
1556 if (r <= 0)
1557 return r;
de40a303
LP		 1558 break;
1559
1560 case 'P':
1561 case ARG_PIPE:
dce66ffe
ZJS		 1562 r = handle_arg_console("pipe");
1563 if (r <= 0)
1564 return r;
de40a303
LP		 1565 break;
1566
bb068de0
ZJS		 1567 case ARG_NO_PAGER:
1568 arg_pager_flags |= PAGER_DISABLE;
1569 break;
1570
3652872a
LP		 1571 case ARG_SET_CREDENTIAL: {
1572 _cleanup_free_ char *word = NULL, *data = NULL;
1573 const char *p = optarg;
1574 Credential *a;
e437538f 1575 ssize_t l;
3652872a
LP		 1576
1577 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1578 if (r == -ENOMEM)
1579 return log_oom();
1580 if (r < 0)
1581 return log_error_errno(r, "Failed to parse --set-credential= parameter: %m");
1582 if (r == 0 || !p)
1583 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --set-credential=: %s", optarg);
1584
1585 if (!credential_name_valid(word))
1586 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1587
12d729b2 1588 for (size_t i = 0; i < arg_n_credentials; i++)
3652872a
LP		 1589 if (streq(arg_credentials[i].id, word))
1590 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1591
1592 l = cunescape(p, UNESCAPE_ACCEPT_NUL, &data);
1593 if (l < 0)
1594 return log_error_errno(l, "Failed to unescape credential data: %s", p);
1595
1596 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1597 if (!a)
1598 return log_oom();
1599
1600 a[arg_n_credentials++] = (Credential) {
1601 .id = TAKE_PTR(word),
1602 .data = TAKE_PTR(data),
1603 .size = l,
1604 };
1605
1606 arg_credentials = a;
1607
1608 arg_settings_mask |= SETTING_CREDENTIALS;
1609 break;
1610 }
1611
1612 case ARG_LOAD_CREDENTIAL: {
1613 ReadFullFileFlags flags = READ_FULL_FILE_SECURE;
1614 _cleanup_(erase_and_freep) char *data = NULL;
1615 _cleanup_free_ char *word = NULL, *j = NULL;
1616 const char *p = optarg;
1617 Credential *a;
1618 size_t size, i;
1619
1620 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1621 if (r == -ENOMEM)
1622 return log_oom();
1623 if (r < 0)
1624 return log_error_errno(r, "Failed to parse --set-credential= parameter: %m");
1625 if (r == 0 || !p)
1626 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --set-credential=: %s", optarg);
1627
1628 if (!credential_name_valid(word))
1629 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1630
1631 for (i = 0; i < arg_n_credentials; i++)
1632 if (streq(arg_credentials[i].id, word))
1633 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1634
1635 if (path_is_absolute(p))
1636 flags |= READ_FULL_FILE_CONNECT_SOCKET;
1637 else {
1638 const char *e;
1639
786d19fd
LP		 1640 r = get_credentials_dir(&e);
1641 if (r < 0)
1642 return log_error_errno(r, "Credential not available (no credentials passed at all): %s", word);
3652872a
LP		 1643
1644 j = path_join(e, p);
1645 if (!j)
1646 return log_oom();
1647 }
1648
986311c2
LP		 1649 r = read_full_file_full(AT_FDCWD, j ?: p, UINT64_MAX, SIZE_MAX,
1650 flags,
1651 NULL,
1652 &data, &size);
3652872a
LP		 1653 if (r < 0)
1654 return log_error_errno(r, "Failed to read credential '%s': %m", j ?: p);
1655
1656 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1657 if (!a)
1658 return log_oom();
1659
1660 a[arg_n_credentials++] = (Credential) {
1661 .id = TAKE_PTR(word),
1662 .data = TAKE_PTR(data),
1663 .size = size,
1664 };
1665
1666 arg_credentials = a;
1667
1668 arg_settings_mask |= SETTING_CREDENTIALS;
1669 break;
1670 }
1671
2f893044
LP		 1672 case ARG_BIND_USER:
1673 if (!valid_user_group_name(optarg, 0))
1674 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid user name to bind: %s", optarg);
1675
1676 if (strv_extend(&arg_bind_user, optarg) < 0)
1677 return log_oom();
1678
1679 arg_settings_mask |= SETTING_BIND_USER;
1680 break;
1681
4a4654e0
LP		 1682 case ARG_SUPPRESS_SYNC:
1683 r = parse_boolean_argument("--suppress-sync=", optarg, &arg_suppress_sync);
1684 if (r < 0)
1685 return r;
1686
1687 arg_settings_mask |= SETTING_SUPPRESS_SYNC;
1688 break;
1689
88213476
LP		 1690 case '?':
1691 return -EINVAL;
1692
1693 default:
04499a70 1694 assert_not_reached();
88213476 1695 }
88213476 1696
60f1ec13
LP		 1697 if (argc > optind) {
1698 strv_free(arg_parameters);
1699 arg_parameters = strv_copy(argv + optind);
1700 if (!arg_parameters)
1701 return log_oom();
d7bea6b6 1702
60f1ec13
LP		 1703 arg_settings_mask |= SETTING_START_MODE;
1704 }
1705
1706 if (arg_ephemeral && arg_template && !arg_directory)
1707 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1708 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1709 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1710 * --directory=". */
1711 arg_directory = TAKE_PTR(arg_template);
1712
bd4b15f2 1713 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? UINT64_C(1) << CAP_NET_ADMIN : 0)) & ~minus;
60f1ec13 1714
de40a303 1715 /* Make sure to parse environment before we reset the settings mask below */
49048684
ZJS		 1716 r = parse_environment();
1717 if (r < 0)
1718 return r;
de40a303 1719
60f1ec13
LP		 1720 /* Load all settings from .nspawn files */
1721 if (mask_no_settings)
1722 arg_settings_mask = 0;
1723
1724 /* Don't load any settings from .nspawn files */
1725 if (mask_all_settings)
1726 arg_settings_mask = _SETTINGS_MASK_ALL;
1727
1728 return 1;
1729}
1730
1731static int verify_arguments(void) {
1732 int r;
a6b5216c 1733
75b0d8b8
ZJS		 1734 if (arg_start_mode == START_PID2 && arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
1735 /* If we are running the stub init in the container, we don't need to look at what the init
1736 * in the container supports, because we are not using it. Let's immediately pick the right
1737 * setting based on the host system configuration.
1738 *
1739 * We only do this, if the user didn't use an environment variable to override the detection.
1740 */
1741
1742 r = cg_all_unified();
1743 if (r < 0)
1744 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
1745 if (r > 0)
1746 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
1747 else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)
1748 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
1749 else
1750 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
1751 }
1752
4f086aab
SU		 1753 if (arg_userns_mode != USER_NAMESPACE_NO)
1754 arg_mount_settings |= MOUNT_USE_USERNS;
1755
1756 if (arg_private_network)
1757 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1758
48a8d337
LB		 1759 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1760 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
eb91eb18 1761 arg_register = false;
baaa35ad 1762 if (arg_start_mode != START_PID1)
60f1ec13 1763 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--boot cannot be used without namespacing.");
0c582db0 1764 }
eb91eb18 1765
6c045a99
LP		 1766 if (arg_userns_ownership < 0)
1767 arg_userns_ownership =
f61c7f88 1768 arg_userns_mode == USER_NAMESPACE_PICK ? USER_NAMESPACE_OWNERSHIP_AUTO :
6c045a99 1769 USER_NAMESPACE_OWNERSHIP_OFF;
0e7ac751 1770
60f1ec13
LP		 1771 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
1772 arg_kill_signal = SIGRTMIN+3;
1773
e5a4bb0d
LP		 1774 if (arg_volatile_mode != VOLATILE_NO) /* Make sure all file systems contained in the image are mounted read-only if we are in volatile mode */
1775 arg_read_only = true;
1776
2436ea76
DDM		 1777 if (has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts))
1778 arg_read_only = true;
1779
baaa35ad 1780 if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0)
8d9c2bca
AJ		 1781 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1782 * The latter is not technically a user session, but we don't need to labour the point. */
60f1ec13 1783 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--keep-unit --register=yes may not be used when invoked from a user session.");
89f7c846 1784
baaa35ad 1785 if (arg_directory && arg_image)
60f1ec13 1786 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--directory= and --image= may not be combined.");
1b9e5b12 1787
baaa35ad 1788 if (arg_template && arg_image)
60f1ec13 1789 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= and --image= may not be combined.");
8cd328d8 1790
baaa35ad 1791 if (arg_template && !(arg_directory || arg_machine))
60f1ec13 1792 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= needs --directory= or --machine=.");
ec16945e 1793
baaa35ad 1794 if (arg_ephemeral && arg_template)
60f1ec13 1795 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined.");
ec16945e 1796
baaa35ad 1797 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO))
60f1ec13 1798 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined.");
df9a75e4 1799
baaa35ad 1800 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported())
60f1ec13 1801 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support.");
7336138e 1802
6c045a99 1803 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_read_only)
de40a303 1804 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
6c045a99 1805 "--read-only and --private-users-ownership=chown may not be combined.");
f757855e 1806
6c045a99
LP		 1807 /* We don't support --private-users-ownership=chown together with any of the volatile modes since we
1808 * couldn't change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a
1809 * massive copy-up (in case of overlay) making the entire exercise pointless. */
1810 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_volatile_mode != VOLATILE_NO)
1811 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--volatile= and --private-users-ownership=chown may not be combined.");
e5a4bb0d 1812
679ecd36
SZ		 1813 /* If --network-namespace-path is given with any other network-related option (except --private-network),
1814 * we need to error out, to avoid conflicts between different network options. */
60f1ec13
LP		 1815 if (arg_network_namespace_path &&
1816 (arg_network_interfaces || arg_network_macvlan ||
1817 arg_network_ipvlan || arg_network_veth_extra ||
1818 arg_network_bridge || arg_network_zone ||
679ecd36 1819 arg_network_veth))
de40a303 1820 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--network-namespace-path= cannot be combined with other network options.");
86c0dd4a 1821
60f1ec13 1822 if (arg_network_bridge && arg_network_zone)
de40a303
LP		 1823 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1824 "--network-bridge= and --network-zone= may not be combined.");
f757855e 1825
baaa35ad 1826 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network)
60f1ec13 1827 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
4f086aab 1828
baaa35ad 1829 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO))
60f1ec13 1830 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot combine --private-users with read-write mounts.");
f757855e 1831
baaa35ad 1832 if (arg_expose_ports && !arg_private_network)
60f1ec13 1833 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot use --port= without private networking.");
6d0b55c2 1834
88fc9c9b 1835 if (arg_caps_ambient) {
f5fbe71d 1836 if (arg_caps_ambient == UINT64_MAX)
88fc9c9b
TH		 1837 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= does not support the value all.");
1838
1839 if ((arg_caps_ambient & arg_caps_retain) != arg_caps_ambient)
1840 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not fully covered by Capability= setting.");
1841
1842 if (arg_start_mode == START_BOOT)
1843 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not useful for boot mode.");
1844 }
1845
2f893044
LP		 1846 if (arg_userns_mode == USER_NAMESPACE_NO && !strv_isempty(arg_bind_user))
1847 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--bind-user= requires --private-users");
1848
1849 /* Drop duplicate --bind-user= entries */
1850 strv_uniq(arg_bind_user);
1851
60f1ec13
LP		 1852 r = custom_mount_check_all();
1853 if (r < 0)
1854 return r;
c6c8f6e2 1855
f757855e 1856 return 0;
88213476
LP		 1857}
1858
91181e07 1859int userns_lchown(const char *p, uid_t uid, gid_t gid) {
03cfe0d5
LP		 1860 assert(p);
1861
0de7acce 1862 if (arg_userns_mode == USER_NAMESPACE_NO)
03cfe0d5
LP		 1863 return 0;
1864
1865 if (uid == UID_INVALID && gid == GID_INVALID)
1866 return 0;
1867
1868 if (uid != UID_INVALID) {
1869 uid += arg_uid_shift;
1870
1871 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1872 return -EOVERFLOW;
1873 }
1874
1875 if (gid != GID_INVALID) {
1876 gid += (gid_t) arg_uid_shift;
1877
1878 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1879 return -EOVERFLOW;
1880 }
1881
1882 if (lchown(p, uid, gid) < 0)
1883 return -errno;
b12afc8c
LP		 1884
1885 return 0;
1886}
1887
91181e07 1888int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
03cfe0d5 1889 const char *q;
dae8b82e 1890 int r;
03cfe0d5
LP		 1891
1892 q = prefix_roota(root, path);
dae8b82e
ZJS		 1893 r = mkdir_errno_wrapper(q, mode);
1894 if (r == -EEXIST)
1895 return 0;
1896 if (r < 0)
1897 return r;
03cfe0d5
LP		 1898
1899 return userns_lchown(q, uid, gid);
1900}
1901
1688841f 1902static const char *timezone_from_path(const char *path) {
da9fc98d
LP		 1903 return PATH_STARTSWITH_SET(
1904 path,
1905 "../usr/share/zoneinfo/",
1906 "/usr/share/zoneinfo/");
1688841f
LP		 1907}
1908
83205269
LP		 1909static bool etc_writable(void) {
1910 return !arg_read_only || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY);
1911}
1912
e58a1277 1913static int setup_timezone(const char *dest) {
1688841f
LP		 1914 _cleanup_free_ char *p = NULL, *etc = NULL;
1915 const char *where, *check;
1916 TimezoneMode m;
d4036145 1917 int r;
f8440af5 1918
e58a1277
LP		 1919 assert(dest);
1920
1688841f 1921 if (IN_SET(arg_timezone, TIMEZONE_AUTO, TIMEZONE_SYMLINK)) {
1688841f
LP		 1922 r = readlink_malloc("/etc/localtime", &p);
1923 if (r == -ENOENT && arg_timezone == TIMEZONE_AUTO)
83205269 1924 m = etc_writable() ? TIMEZONE_DELETE : TIMEZONE_OFF;
1688841f 1925 else if (r == -EINVAL && arg_timezone == TIMEZONE_AUTO) /* regular file? */
83205269 1926 m = etc_writable() ? TIMEZONE_COPY : TIMEZONE_BIND;
1688841f
LP		 1927 else if (r < 0) {
1928 log_warning_errno(r, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1929 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1930 * file.
1931 *
1932 * Example:
1933 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1934 */
1935 return 0;
1936 } else if (arg_timezone == TIMEZONE_AUTO)
83205269 1937 m = etc_writable() ? TIMEZONE_SYMLINK : TIMEZONE_BIND;
1688841f
LP		 1938 else
1939 m = arg_timezone;
1940 } else
1941 m = arg_timezone;
1942
1943 if (m == TIMEZONE_OFF)
1944 return 0;
1945
a5648b80 1946 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
d4036145 1947 if (r < 0) {
1688841f 1948 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
d4036145
LP		 1949 return 0;
1950 }
1951
1688841f
LP		 1952 where = strjoina(etc, "/localtime");
1953
1954 switch (m) {
1955
1956 case TIMEZONE_DELETE:
1957 if (unlink(where) < 0)
1958 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
1959
d4036145 1960 return 0;
d4036145 1961
1688841f
LP		 1962 case TIMEZONE_SYMLINK: {
1963 _cleanup_free_ char *q = NULL;
1964 const char *z, *what;
4d1c38b8 1965
1688841f
LP		 1966 z = timezone_from_path(p);
1967 if (!z) {
1968 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
d4036145 1969 return 0;
1688841f 1970 }
d4036145 1971
1688841f
LP		 1972 r = readlink_malloc(where, &q);
1973 if (r >= 0 && streq_ptr(timezone_from_path(q), z))
1974 return 0; /* Already pointing to the right place? Then do nothing .. */
1975
1976 check = strjoina(dest, "/usr/share/zoneinfo/", z);
a5648b80 1977 r = chase_symlinks(check, dest, 0, NULL, NULL);
1688841f
LP		 1978 if (r < 0)
1979 log_debug_errno(r, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z);
1980 else {
1981 if (unlink(where) < 0 && errno != ENOENT) {
1982 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1983 errno, "Failed to remove existing timezone info %s in container, ignoring: %m", where);
1984 return 0;
1985 }
1986
1987 what = strjoina("../usr/share/zoneinfo/", z);
1988 if (symlink(what, where) < 0) {
1989 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1990 errno, "Failed to correct timezone of container, ignoring: %m");
1991 return 0;
1992 }
1993
1994 break;
1995 }
1996
1997 _fallthrough_;
d4036145 1998 }
68fb0892 1999
1688841f
LP		 2000 case TIMEZONE_BIND: {
2001 _cleanup_free_ char *resolved = NULL;
2002 int found;
2003
a5648b80 2004 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
1688841f
LP		 2005 if (found < 0) {
2006 log_warning_errno(found, "Failed to resolve /etc/localtime path in container, ignoring: %m");
2007 return 0;
2008 }
2009
2010 if (found == 0) /* missing? */
2011 (void) touch(resolved);
2012
511a8cfe 2013 r = mount_nofollow_verbose(LOG_WARNING, "/etc/localtime", resolved, NULL, MS_BIND, NULL);
1688841f 2014 if (r >= 0)
511a8cfe 2015 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
1688841f
LP		 2016
2017 _fallthrough_;
79d80fc1 2018 }
4d9f07b4 2019
1688841f
LP		 2020 case TIMEZONE_COPY:
2021 /* If mounting failed, try to copy */
8a016c74 2022 r = copy_file_atomic("/etc/localtime", where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
1688841f
LP		 2023 if (r < 0) {
2024 log_full_errno(IN_SET(r, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
2025 "Failed to copy /etc/localtime to %s, ignoring: %m", where);
2026 return 0;
2027 }
2028
2029 break;
2030
2031 default:
04499a70 2032 assert_not_reached();
d4036145 2033 }
e58a1277 2034
1688841f 2035 /* Fix permissions of the symlink or file copy we just created */
03cfe0d5
LP		 2036 r = userns_lchown(where, 0, 0);
2037 if (r < 0)
1688841f 2038 log_warning_errno(r, "Failed to chown /etc/localtime, ignoring: %m");
03cfe0d5 2039
e58a1277 2040 return 0;
88213476
LP		 2041}
2042
09d423e9
LP		 2043static int have_resolv_conf(const char *path) {
2044 assert(path);
2045
2046 if (access(path, F_OK) < 0) {
2047 if (errno == ENOENT)
2048 return 0;
2049
2050 return log_debug_errno(errno, "Failed to determine whether '%s' is available: %m", path);
2051 }
2052
2053 return 1;
2054}
2055
7357272e 2056static int resolved_listening(void) {
b8ea7a6e 2057 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
b053cd5f 2058 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
7357272e 2059 _cleanup_free_ char *dns_stub_listener_mode = NULL;
b053cd5f
LP		 2060 int r;
2061
7357272e 2062 /* Check if resolved is listening */
b053cd5f
LP		 2063
2064 r = sd_bus_open_system(&bus);
2065 if (r < 0)
b8ea7a6e 2066 return log_debug_errno(r, "Failed to open system bus: %m");
b053cd5f 2067
7357272e 2068 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
b8ea7a6e
LP		 2069 if (r < 0)
2070 return log_debug_errno(r, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
2071 if (r == 0)
2072 return 0;
7357272e
DM		 2073
2074 r = sd_bus_get_property_string(bus,
2075 "org.freedesktop.resolve1",
2076 "/org/freedesktop/resolve1",
2077 "org.freedesktop.resolve1.Manager",
2078 "DNSStubListener",
b8ea7a6e 2079 &error,
7357272e
DM		 2080 &dns_stub_listener_mode);
2081 if (r < 0)
b8ea7a6e 2082 return log_debug_errno(r, "Failed to query DNSStubListener property: %s", bus_error_message(&error, r));
7357272e
DM		 2083
2084 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
b053cd5f
LP		 2085}
2086
2547bb41 2087static int setup_resolv_conf(const char *dest) {
09d423e9
LP		 2088 _cleanup_free_ char *etc = NULL;
2089 const char *where, *what;
2090 ResolvConfMode m;
2091 int r;
2547bb41
LP		 2092
2093 assert(dest);
2094
09d423e9
LP		 2095 if (arg_resolv_conf == RESOLV_CONF_AUTO) {
2096 if (arg_private_network)
2097 m = RESOLV_CONF_OFF;
86775e35
LP		 2098 else if (have_resolv_conf(PRIVATE_STUB_RESOLV_CONF) > 0 && resolved_listening() > 0)
2099 m = etc_writable() ? RESOLV_CONF_COPY_STUB : RESOLV_CONF_BIND_STUB;
09d423e9 2100 else if (have_resolv_conf("/etc/resolv.conf") > 0)
83205269 2101 m = etc_writable() ? RESOLV_CONF_COPY_HOST : RESOLV_CONF_BIND_HOST;
09d423e9 2102 else
83205269 2103 m = etc_writable() ? RESOLV_CONF_DELETE : RESOLV_CONF_OFF;
86775e35 2104
09d423e9
LP		 2105 } else
2106 m = arg_resolv_conf;
2107
2108 if (m == RESOLV_CONF_OFF)
2547bb41
LP		 2109 return 0;
2110
a5648b80 2111 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
87447ae4
LP		 2112 if (r < 0) {
2113 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
2114 return 0;
2115 }
2116
2117 where = strjoina(etc, "/resolv.conf");
09d423e9
LP		 2118
2119 if (m == RESOLV_CONF_DELETE) {
2120 if (unlink(where) < 0)
2121 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
2122
87447ae4
LP		 2123 return 0;
2124 }
79d80fc1 2125
86775e35
LP		 2126 if (IN_SET(m, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_COPY_STATIC))
2127 what = PRIVATE_STATIC_RESOLV_CONF;
2128 else if (IN_SET(m, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_COPY_UPLINK))
2129 what = PRIVATE_UPLINK_RESOLV_CONF;
2130 else if (IN_SET(m, RESOLV_CONF_BIND_STUB, RESOLV_CONF_REPLACE_STUB, RESOLV_CONF_COPY_STUB))
2131 what = PRIVATE_STUB_RESOLV_CONF;
09d423e9
LP		 2132 else
2133 what = "/etc/resolv.conf";
87447ae4 2134
86775e35 2135 if (IN_SET(m, RESOLV_CONF_BIND_HOST, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_BIND_STUB)) {
09d423e9
LP		 2136 _cleanup_free_ char *resolved = NULL;
2137 int found;
2138
a5648b80 2139 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
09d423e9
LP		 2140 if (found < 0) {
2141 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
2142 return 0;
2143 }
3539724c 2144
87447ae4
LP		 2145 if (found == 0) /* missing? */
2146 (void) touch(resolved);
5367354d 2147
511a8cfe 2148 r = mount_nofollow_verbose(LOG_WARNING, what, resolved, NULL, MS_BIND, NULL);
60e76d48 2149 if (r >= 0)
511a8cfe 2150 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
86775e35
LP		 2151
2152 /* If that didn't work, let's copy the file */
3539724c
LP		 2153 }
2154
86775e35
LP		 2155 if (IN_SET(m, RESOLV_CONF_REPLACE_HOST, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_REPLACE_STUB))
2156 r = copy_file_atomic(what, where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
2157 else
2158 r = copy_file(what, where, O_TRUNC|O_NOFOLLOW, 0644, 0, 0, COPY_REFLINK);
79d80fc1 2159 if (r < 0) {
3539724c
LP		 2160 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
2161 * resolved or something similar runs inside and the symlink points there.
68a313c5 2162 *
3539724c 2163 * If the disk image is read-only, there's also no point in complaining.
68a313c5 2164 */
86775e35
LP		 2165 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST, RESOLV_CONF_COPY_STATIC, RESOLV_CONF_COPY_UPLINK, RESOLV_CONF_COPY_STUB) &&
2166 IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
3539724c 2167 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
79d80fc1
TG		 2168 return 0;
2169 }
2547bb41 2170
03cfe0d5
LP		 2171 r = userns_lchown(where, 0, 0);
2172 if (r < 0)
3539724c 2173 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
03cfe0d5 2174
2547bb41
LP		 2175 return 0;
2176}
2177
1e4f1671 2178static int setup_boot_id(void) {
cdde6ba6
LP		 2179 _cleanup_(unlink_and_freep) char *from = NULL;
2180 _cleanup_free_ char *path = NULL;
3bbaff3e 2181 sd_id128_t rnd = SD_ID128_NULL;
cdde6ba6 2182 const char *to;
04bc4a3f
LP		 2183 int r;
2184
1eacc470 2185 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
04bc4a3f 2186
1eacc470 2187 r = tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path);
cdde6ba6
LP		 2188 if (r < 0)
2189 return log_error_errno(r, "Failed to generate random boot ID path: %m");
04bc4a3f
LP		 2190
2191 r = sd_id128_randomize(&rnd);
f647962d
MS		 2192 if (r < 0)
2193 return log_error_errno(r, "Failed to generate random boot id: %m");
04bc4a3f 2194
cdde6ba6 2195 r = id128_write(path, ID128_UUID, rnd, false);
f647962d
MS		 2196 if (r < 0)
2197 return log_error_errno(r, "Failed to write boot id: %m");
04bc4a3f 2198
cdde6ba6
LP		 2199 from = TAKE_PTR(path);
2200 to = "/proc/sys/kernel/random/boot_id";
2201
511a8cfe 2202 r = mount_nofollow_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
cdde6ba6
LP		 2203 if (r < 0)
2204 return r;
04bc4a3f 2205
511a8cfe 2206 return mount_nofollow_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
04bc4a3f
LP		 2207}
2208
e58a1277 2209static int copy_devnodes(const char *dest) {
88213476
LP		 2210 static const char devnodes[] =
2211 "null\0"
2212 "zero\0"
2213 "full\0"
2214 "random\0"
2215 "urandom\0"
85614d66
TG		 2216 "tty\0"
2217 "net/tun\0";
88213476 2218
d7ac0952 2219 _unused_ _cleanup_umask_ mode_t u;
88213476 2220 const char *d;
e58a1277 2221 int r = 0;
a258bf26
LP		 2222
2223 assert(dest);
124640f1
LP		 2224
2225 u = umask(0000);
88213476 2226
03cfe0d5
LP		 2227 /* Create /dev/net, so that we can create /dev/net/tun in it */
2228 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
2229 return log_error_errno(r, "Failed to create /dev/net directory: %m");
2230
88213476 2231 NULSTR_FOREACH(d, devnodes) {
7fd1b19b 2232 _cleanup_free_ char *from = NULL, *to = NULL;
7f112f50 2233 struct stat st;
88213476 2234
c6134d3e 2235 from = path_join("/dev/", d);
8967f291
LP		 2236 if (!from)
2237 return log_oom();
2238
c6134d3e 2239 to = path_join(dest, from);
8967f291
LP		 2240 if (!to)
2241 return log_oom();
88213476
LP		 2242
2243 if (stat(from, &st) < 0) {
2244
4a62c710
MS		 2245 if (errno != ENOENT)
2246 return log_error_errno(errno, "Failed to stat %s: %m", from);
88213476 2247
baaa35ad
ZJS		 2248 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode))
2249 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2250 "%s is not a char or block device, cannot copy.", from);
2251 else {
8dfce114
LP		 2252 _cleanup_free_ char *sl = NULL, *prefixed = NULL, *dn = NULL, *t = NULL;
2253
81f5049b 2254 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
8dbf71ec 2255 /* Explicitly warn the user when /dev is already populated. */
41eb4362 2256 if (errno == EEXIST)
8dbf71ec 2257 log_notice("%s/dev is pre-mounted and pre-populated. If a pre-mounted /dev is provided it needs to be an unpopulated file system.", dest);
81f5049b
AC		 2258 if (errno != EPERM)
2259 return log_error_errno(errno, "mknod(%s) failed: %m", to);
2260
8dfce114 2261 /* Some systems abusively restrict mknod but allow bind mounts. */
81f5049b
AC		 2262 r = touch(to);
2263 if (r < 0)
2264 return log_error_errno(r, "touch (%s) failed: %m", to);
511a8cfe 2265 r = mount_nofollow_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
60e76d48
ZJS		 2266 if (r < 0)
2267 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
81f5049b 2268 }
6278cf60 2269
03cfe0d5
LP		 2270 r = userns_lchown(to, 0, 0);
2271 if (r < 0)
2272 return log_error_errno(r, "chown() of device node %s failed: %m", to);
8dfce114 2273
657ee2d8 2274 dn = path_join("/dev", S_ISCHR(st.st_mode) ? "char" : "block");
8dfce114
LP		 2275 if (!dn)
2276 return log_oom();
2277
2278 r = userns_mkdir(dest, dn, 0755, 0, 0);
2279 if (r < 0)
2280 return log_error_errno(r, "Failed to create '%s': %m", dn);
2281
2282 if (asprintf(&sl, "%s/%u:%u", dn, major(st.st_rdev), minor(st.st_rdev)) < 0)
2283 return log_oom();
2284
c6134d3e 2285 prefixed = path_join(dest, sl);
8dfce114
LP		 2286 if (!prefixed)
2287 return log_oom();
2288
2d9b74ba 2289 t = path_join("..", d);
8dfce114
LP		 2290 if (!t)
2291 return log_oom();
2292
2293 if (symlink(t, prefixed) < 0)
2294 log_debug_errno(errno, "Failed to symlink '%s' to '%s': %m", t, prefixed);
88213476 2295 }
88213476
LP		 2296 }
2297
e58a1277
LP		 2298 return r;
2299}
88213476 2300
de40a303 2301static int make_extra_nodes(const char *dest) {
d7ac0952 2302 _unused_ _cleanup_umask_ mode_t u;
de40a303
LP		 2303 size_t i;
2304 int r;
2305
2306 u = umask(0000);
2307
2308 for (i = 0; i < arg_n_extra_nodes; i++) {
2309 _cleanup_free_ char *path = NULL;
2310 DeviceNode *n = arg_extra_nodes + i;
2311
c6134d3e 2312 path = path_join(dest, n->path);
de40a303
LP		 2313 if (!path)
2314 return log_oom();
2315
2316 if (mknod(path, n->mode, S_ISCHR(n->mode) || S_ISBLK(n->mode) ? makedev(n->major, n->minor) : 0) < 0)
2317 return log_error_errno(errno, "Failed to create device node '%s': %m", path);
2318
2319 r = chmod_and_chown(path, n->mode, n->uid, n->gid);
2320 if (r < 0)
2321 return log_error_errno(r, "Failed to adjust device node ownership of '%s': %m", path);
2322 }
2323
2324 return 0;
2325}
2326
03cfe0d5
LP		 2327static int setup_pts(const char *dest) {
2328 _cleanup_free_ char *options = NULL;
2329 const char *p;
709f6e46 2330 int r;
03cfe0d5 2331
349cc4a5 2332#if HAVE_SELINUX
03cfe0d5
LP		 2333 if (arg_selinux_apifs_context)
2334 (void) asprintf(&options,
3dce8915 2335 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
03cfe0d5
LP		 2336 arg_uid_shift + TTY_GID,
2337 arg_selinux_apifs_context);
2338 else
2339#endif
2340 (void) asprintf(&options,
3dce8915 2341 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
03cfe0d5 2342 arg_uid_shift + TTY_GID);
f2d88580 2343
03cfe0d5 2344 if (!options)
f2d88580
LP		 2345 return log_oom();
2346
03cfe0d5 2347 /* Mount /dev/pts itself */
cc9fce65 2348 p = prefix_roota(dest, "/dev/pts");
dae8b82e
ZJS		 2349 r = mkdir_errno_wrapper(p, 0755);
2350 if (r < 0)
2351 return log_error_errno(r, "Failed to create /dev/pts: %m");
2352
511a8cfe 2353 r = mount_nofollow_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
60e76d48
ZJS		 2354 if (r < 0)
2355 return r;
709f6e46
MS		 2356 r = userns_lchown(p, 0, 0);
2357 if (r < 0)
2358 return log_error_errno(r, "Failed to chown /dev/pts: %m");
03cfe0d5
LP		 2359
2360 /* Create /dev/ptmx symlink */
2361 p = prefix_roota(dest, "/dev/ptmx");
4a62c710
MS		 2362 if (symlink("pts/ptmx", p) < 0)
2363 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
709f6e46
MS		 2364 r = userns_lchown(p, 0, 0);
2365 if (r < 0)
2366 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
f2d88580 2367
03cfe0d5
LP		 2368 /* And fix /dev/pts/ptmx ownership */
2369 p = prefix_roota(dest, "/dev/pts/ptmx");
709f6e46
MS		 2370 r = userns_lchown(p, 0, 0);
2371 if (r < 0)
2372 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
6278cf60 2373
f2d88580
LP		 2374 return 0;
2375}
2376
3acc84eb 2377static int setup_stdio_as_dev_console(void) {
2fef50cd 2378 _cleanup_close_ int terminal = -1;
e58a1277 2379 int r;
e58a1277 2380
335d2ead
LP		 2381 /* We open the TTY in O_NOCTTY mode, so that we do not become controller yet. We'll do that later
2382 * explicitly, if we are configured to. */
2383 terminal = open_terminal("/dev/console", O_RDWR|O_NOCTTY);
3acc84eb
FB		 2384 if (terminal < 0)
2385 return log_error_errno(terminal, "Failed to open console: %m");
e58a1277 2386
3acc84eb
FB		 2387 /* Make sure we can continue logging to the original stderr, even if
2388 * stderr points elsewhere now */
2389 r = log_dup_console();
2390 if (r < 0)
2391 return log_error_errno(r, "Failed to duplicate stderr: %m");
de40a303 2392
3acc84eb
FB		 2393 /* invalidates 'terminal' on success and failure */
2394 r = rearrange_stdio(terminal, terminal, terminal);
2fef50cd 2395 TAKE_FD(terminal);
f647962d 2396 if (r < 0)
3acc84eb
FB		 2397 return log_error_errno(r, "Failed to move console to stdin/stdout/stderr: %m");
2398
2399 return 0;
2400}
88213476 2401
3acc84eb
FB		 2402static int setup_dev_console(const char *console) {
2403 _cleanup_free_ char *p = NULL;
2404 int r;
a258bf26 2405
3acc84eb
FB		 2406 /* Create /dev/console symlink */
2407 r = path_make_relative("/dev", console, &p);
81f5049b 2408 if (r < 0)
3acc84eb
FB		 2409 return log_error_errno(r, "Failed to create relative path: %m");
2410
2411 if (symlink(p, "/dev/console") < 0)
2412 return log_error_errno(errno, "Failed to create /dev/console symlink: %m");
a258bf26 2413
3acc84eb 2414 return 0;
e58a1277
LP		 2415}
2416
8e5430c4
LP		 2417static int setup_keyring(void) {
2418 key_serial_t keyring;
2419
6b000af4
LP		 2420 /* Allocate a new session keyring for the container. This makes sure the keyring of the session
2421 * systemd-nspawn was invoked from doesn't leak into the container. Note that by default we block
2422 * keyctl() and request_key() anyway via seccomp so doing this operation isn't strictly necessary,
2423 * but in case people explicitly allow-list these system calls let's make sure we don't leak anything
2424 * into the container. */
8e5430c4
LP		 2425
2426 keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
2427 if (keyring == -1) {
2428 if (errno == ENOSYS)
2429 log_debug_errno(errno, "Kernel keyring not supported, ignoring.");
065b4774 2430 else if (ERRNO_IS_PRIVILEGE(errno))
8e5430c4
LP		 2431 log_debug_errno(errno, "Kernel keyring access prohibited, ignoring.");
2432 else
2433 return log_error_errno(errno, "Setting up kernel keyring failed: %m");
2434 }
2435
2436 return 0;
2437}
2438
3652872a
LP		 2439static int setup_credentials(const char *root) {
2440 const char *q;
2441 int r;
2442
2443 if (arg_n_credentials <= 0)
2444 return 0;
2445
2446 r = userns_mkdir(root, "/run/host", 0755, 0, 0);
2447 if (r < 0)
2448 return log_error_errno(r, "Failed to create /run/host: %m");
2449
2450 r = userns_mkdir(root, "/run/host/credentials", 0700, 0, 0);
2451 if (r < 0)
2452 return log_error_errno(r, "Failed to create /run/host/credentials: %m");
2453
2454 q = prefix_roota(root, "/run/host/credentials");
511a8cfe 2455 r = mount_nofollow_verbose(LOG_ERR, NULL, q, "ramfs", MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0700");
3652872a
LP		 2456 if (r < 0)
2457 return r;
2458
2459 for (size_t i = 0; i < arg_n_credentials; i++) {
2460 _cleanup_free_ char *j = NULL;
2461 _cleanup_close_ int fd = -1;
2462
2463 j = path_join(q, arg_credentials[i].id);
2464 if (!j)
2465 return log_oom();
2466
2467 fd = open(j, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC|O_NOFOLLOW, 0600);
2468 if (fd < 0)
2469 return log_error_errno(errno, "Failed to create credential file %s: %m", j);
2470
2471 r = loop_write(fd, arg_credentials[i].data, arg_credentials[i].size, /* do_poll= */ false);
2472 if (r < 0)
2473 return log_error_errno(r, "Failed to write credential to file %s: %m", j);
2474
2475 if (fchmod(fd, 0400) < 0)
2476 return log_error_errno(errno, "Failed to adjust access mode of %s: %m", j);
2477
2478 if (arg_userns_mode != USER_NAMESPACE_NO) {
2479 if (fchown(fd, arg_uid_shift, arg_uid_shift) < 0)
2480 return log_error_errno(errno, "Failed to adjust ownership of %s: %m", j);
2481 }
2482 }
2483
2484 if (chmod(q, 0500) < 0)
2485 return log_error_errno(errno, "Failed to adjust access mode of %s: %m", q);
2486
2487 r = userns_lchown(q, 0, 0);
2488 if (r < 0)
2489 return r;
2490
2491 /* Make both mount and superblock read-only now */
511a8cfe 2492 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
3652872a
LP		 2493 if (r < 0)
2494 return r;
2495
511a8cfe 2496 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0500");
3652872a
LP		 2497}
2498
1e4f1671 2499static int setup_kmsg(int kmsg_socket) {
9ec5a93c
LP		 2500 _cleanup_(unlink_and_freep) char *from = NULL;
2501 _cleanup_free_ char *fifo = NULL;
2502 _cleanup_close_ int fd = -1;
d7ac0952 2503 _unused_ _cleanup_umask_ mode_t u;
9ec5a93c 2504 int r;
e58a1277 2505
e58a1277 2506 assert(kmsg_socket >= 0);
a258bf26 2507
e58a1277 2508 u = umask(0000);
a258bf26 2509
1eacc470 2510 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
9ec5a93c
LP		 2511 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2512 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2513 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2514
1eacc470 2515 r = tempfn_random_child("/run", "proc-kmsg", &fifo);
9ec5a93c
LP		 2516 if (r < 0)
2517 return log_error_errno(r, "Failed to generate kmsg path: %m");
e58a1277 2518
9ec5a93c 2519 if (mkfifo(fifo, 0600) < 0)
03cfe0d5 2520 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
9ec5a93c
LP		 2521
2522 from = TAKE_PTR(fifo);
9ec5a93c 2523
511a8cfe 2524 r = mount_nofollow_verbose(LOG_ERR, from, "/proc/kmsg", NULL, MS_BIND, NULL);
60e76d48
ZJS		 2525 if (r < 0)
2526 return r;
e58a1277 2527
669fc4e5 2528 fd = open(from, O_RDWR|O_NONBLOCK|O_CLOEXEC);
4a62c710
MS		 2529 if (fd < 0)
2530 return log_error_errno(errno, "Failed to open fifo: %m");
e58a1277 2531
9ec5a93c 2532 /* Store away the fd in the socket, so that it stays open as long as we run the child */
3ee897d6 2533 r = send_one_fd(kmsg_socket, fd, 0);
d9603714
DH		 2534 if (r < 0)
2535 return log_error_errno(r, "Failed to send FIFO fd: %m");
a258bf26 2536
25ea79fe 2537 return 0;
88213476
LP		 2538}
2539
761cf19d 2540struct ExposeArgs {
deff68e7
FW		 2541 union in_addr_union address4;
2542 union in_addr_union address6;
761cf19d
FW		 2543 struct FirewallContext *fw_ctx;
2544};
2545
1c4baffc 2546static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
761cf19d 2547 struct ExposeArgs *args = userdata;
6d0b55c2
LP		 2548
2549 assert(rtnl);
2550 assert(m);
761cf19d 2551 assert(args);
6d0b55c2 2552
deff68e7
FW		 2553 expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET, &args->address4);
2554 expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET6, &args->address6);
6d0b55c2
LP		 2555 return 0;
2556}
2557
3a74cea5 2558static int setup_hostname(void) {
c818eef1 2559 int r;
3a74cea5 2560
0c582db0 2561 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
eb91eb18
LP		 2562 return 0;
2563
c818eef1
LP		 2564 r = sethostname_idempotent(arg_hostname ?: arg_machine);
2565 if (r < 0)
2566 return log_error_errno(r, "Failed to set hostname: %m");
3a74cea5 2567
7027ff61 2568 return 0;
3a74cea5
LP		 2569}
2570
57fb9fb5 2571static int setup_journal(const char *directory) {
0f5e1382 2572 _cleanup_free_ char *d = NULL;
b2238e38
LP		 2573 const char *dirname, *p, *q;
2574 sd_id128_t this_id;
8054d749 2575 bool try;
57fb9fb5
LP		 2576 int r;
2577
df9a75e4
LP		 2578 /* Don't link journals in ephemeral mode */
2579 if (arg_ephemeral)
2580 return 0;
2581
8054d749
LP		 2582 if (arg_link_journal == LINK_NO)
2583 return 0;
2584
2585 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
2586
4d680aee 2587 r = sd_id128_get_machine(&this_id);
f647962d
MS		 2588 if (r < 0)
2589 return log_error_errno(r, "Failed to retrieve machine ID: %m");
4d680aee 2590
e01ff70a 2591 if (sd_id128_equal(arg_uuid, this_id)) {
8054d749 2592 log_full(try ? LOG_WARNING : LOG_ERR,
85b55869 2593 "Host and machine ids are equal (%s): refusing to link journals", SD_ID128_TO_STRING(arg_uuid));
8054d749 2594 if (try)
4d680aee 2595 return 0;
df9a75e4 2596 return -EEXIST;
4d680aee
ZJS		 2597 }
2598
369ca6da
ZJS		 2599 FOREACH_STRING(dirname, "/var", "/var/log", "/var/log/journal") {
2600 r = userns_mkdir(directory, dirname, 0755, 0, 0);
2601 if (r < 0) {
2602 bool ignore = r == -EROFS && try;
2603 log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
2604 "Failed to create %s%s: %m", dirname, ignore ? ", ignoring" : "");
2605 return ignore ? 0 : r;
2606 }
2607 }
03cfe0d5 2608
85b55869 2609 p = strjoina("/var/log/journal/", SD_ID128_TO_STRING(arg_uuid));
03cfe0d5 2610 q = prefix_roota(directory, p);
27407a01 2611
e1873695 2612 if (path_is_mount_point(p, NULL, 0) > 0) {
8054d749
LP		 2613 if (try)
2614 return 0;
27407a01 2615
baaa35ad
ZJS		 2616 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2617 "%s: already a mount point, refusing to use for journal", p);
57fb9fb5
LP		 2618 }
2619
e1873695 2620 if (path_is_mount_point(q, NULL, 0) > 0) {
8054d749
LP		 2621 if (try)
2622 return 0;
57fb9fb5 2623
baaa35ad
ZJS		 2624 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2625 "%s: already a mount point, refusing to use for journal", q);
57fb9fb5
LP		 2626 }
2627
2628 r = readlink_and_make_absolute(p, &d);
2629 if (r >= 0) {
3742095b 2630 if (IN_SET(arg_link_journal, LINK_GUEST, LINK_AUTO) &&
57fb9fb5
LP		 2631 path_equal(d, q)) {
2632
03cfe0d5 2633 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 2634 if (r < 0)
709f6e46 2635 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 2636 return 0;
57fb9fb5
LP		 2637 }
2638
4a62c710
MS		 2639 if (unlink(p) < 0)
2640 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
57fb9fb5
LP		 2641 } else if (r == -EINVAL) {
2642
2643 if (arg_link_journal == LINK_GUEST &&
2644 rmdir(p) < 0) {
2645
27407a01
ZJS		 2646 if (errno == ENOTDIR) {
2647 log_error("%s already exists and is neither a symlink nor a directory", p);
2648 return r;
4314d33f
MS		 2649 } else
2650 return log_error_errno(errno, "Failed to remove %s: %m", p);
57fb9fb5 2651 }
4314d33f
MS		 2652 } else if (r != -ENOENT)
2653 return log_error_errno(r, "readlink(%s) failed: %m", p);
57fb9fb5
LP		 2654
2655 if (arg_link_journal == LINK_GUEST) {
2656
2657 if (symlink(q, p) < 0) {
8054d749 2658 if (try) {
56f64d95 2659 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
574edc90 2660 return 0;
4314d33f
MS		 2661 } else
2662 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
57fb9fb5
LP		 2663 }
2664
03cfe0d5 2665 r = userns_mkdir(directory, p, 0755, 0, 0);
27407a01 2666 if (r < 0)
709f6e46 2667 log_warning_errno(r, "Failed to create directory %s: %m", q);
27407a01 2668 return 0;
57fb9fb5
LP		 2669 }
2670
2671 if (arg_link_journal == LINK_HOST) {
ccddd104 2672 /* don't create parents here — if the host doesn't have
574edc90 2673 * permanent journal set up, don't force it here */
ba8e6c4d 2674
dae8b82e
ZJS		 2675 r = mkdir_errno_wrapper(p, 0755);
2676 if (r < 0 && r != -EEXIST) {
8054d749 2677 if (try) {
dae8b82e 2678 log_debug_errno(r, "Failed to create %s, skipping journal setup: %m", p);
574edc90 2679 return 0;
4314d33f 2680 } else
dae8b82e 2681 return log_error_errno(r, "Failed to create %s: %m", p);
57fb9fb5
LP		 2682 }
2683
27407a01
ZJS		 2684 } else if (access(p, F_OK) < 0)
2685 return 0;
57fb9fb5 2686
cdb2b9d0
LP		 2687 if (dir_is_empty(q) == 0)
2688 log_warning("%s is not empty, proceeding anyway.", q);
2689
03cfe0d5 2690 r = userns_mkdir(directory, p, 0755, 0, 0);
709f6e46
MS		 2691 if (r < 0)
2692 return log_error_errno(r, "Failed to create %s: %m", q);
57fb9fb5 2693
511a8cfe 2694 r = mount_nofollow_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
60e76d48 2695 if (r < 0)
4a62c710 2696 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
57fb9fb5 2697
27407a01 2698 return 0;
57fb9fb5
LP		 2699}
2700
de40a303
LP		 2701static int drop_capabilities(uid_t uid) {
2702 CapabilityQuintet q;
2703
2704 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2705 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2706 * arg_caps_retain. */
2707
2708 if (capability_quintet_is_set(&arg_full_capabilities)) {
2709 q = arg_full_capabilities;
2710
f5fbe71d 2711 if (q.bounding == UINT64_MAX)
de40a303
LP		 2712 q.bounding = uid == 0 ? arg_caps_retain : 0;
2713
f5fbe71d 2714 if (q.effective == UINT64_MAX)
de40a303
LP		 2715 q.effective = uid == 0 ? q.bounding : 0;
2716
f5fbe71d 2717 if (q.inheritable == UINT64_MAX)
88fc9c9b 2718 q.inheritable = uid == 0 ? q.bounding : arg_caps_ambient;
de40a303 2719
f5fbe71d 2720 if (q.permitted == UINT64_MAX)
88fc9c9b 2721 q.permitted = uid == 0 ? q.bounding : arg_caps_ambient;
de40a303 2722
f5fbe71d 2723 if (q.ambient == UINT64_MAX && ambient_capabilities_supported())
88fc9c9b 2724 q.ambient = arg_caps_ambient;
f66ad460
AZ		 2725
2726 if (capability_quintet_mangle(&q))
2727 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Cannot set capabilities that are not in the current bounding set.");
2728
2729 } else {
de40a303
LP		 2730 q = (CapabilityQuintet) {
2731 .bounding = arg_caps_retain,
2732 .effective = uid == 0 ? arg_caps_retain : 0,
88fc9c9b
TH		 2733 .inheritable = uid == 0 ? arg_caps_retain : arg_caps_ambient,
2734 .permitted = uid == 0 ? arg_caps_retain : arg_caps_ambient,
f5fbe71d 2735 .ambient = ambient_capabilities_supported() ? arg_caps_ambient : UINT64_MAX,
de40a303
LP		 2736 };
2737
f66ad460
AZ		 2738 /* If we're not using OCI, proceed with mangled capabilities (so we don't error out)
2739 * in order to maintain the same behavior as systemd < 242. */
2740 if (capability_quintet_mangle(&q))
0ccdaa79
JT		 2741 log_full(arg_quiet ? LOG_DEBUG : LOG_WARNING,
2742 "Some capabilities will not be set because they are not in the current bounding set.");
f66ad460
AZ		 2743
2744 }
2745
de40a303 2746 return capability_quintet_enforce(&q);
88213476
LP		 2747}
2748
db999e0f
LP		 2749static int reset_audit_loginuid(void) {
2750 _cleanup_free_ char *p = NULL;
2751 int r;
2752
0c582db0 2753 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
db999e0f
LP		 2754 return 0;
2755
2756 r = read_one_line_file("/proc/self/loginuid", &p);
13e8ceb8 2757 if (r == -ENOENT)
db999e0f 2758 return 0;
f647962d
MS		 2759 if (r < 0)
2760 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
db999e0f
LP		 2761
2762 /* Already reset? */
2763 if (streq(p, "4294967295"))
2764 return 0;
2765
57512c89 2766 r = write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER);
db999e0f 2767 if (r < 0) {
10a87006
LP		 2768 log_error_errno(r,
2769 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2770 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2771 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2772 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2773 "using systemd-nspawn. Sleeping for 5s... (%m)");
77b6e194 2774
db999e0f 2775 sleep(5);
77b6e194 2776 }
db999e0f
LP		 2777
2778 return 0;
77b6e194
LP		 2779}
2780
785890ac
LP		 2781static int setup_propagate(const char *root) {
2782 const char *p, *q;
709f6e46 2783 int r;
785890ac
LP		 2784
2785 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2786 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
63c372cb 2787 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
785890ac
LP		 2788 (void) mkdir_p(p, 0600);
2789
5a27b395 2790 r = userns_mkdir(root, "/run/host", 0755, 0, 0);
709f6e46 2791 if (r < 0)
5a27b395 2792 return log_error_errno(r, "Failed to create /run/host: %m");
03cfe0d5 2793
5a27b395 2794 r = userns_mkdir(root, "/run/host/incoming", 0600, 0, 0);
709f6e46 2795 if (r < 0)
5a27b395 2796 return log_error_errno(r, "Failed to create /run/host/incoming: %m");
03cfe0d5 2797
5a27b395 2798 q = prefix_roota(root, "/run/host/incoming");
511a8cfe 2799 r = mount_nofollow_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
60e76d48
ZJS		 2800 if (r < 0)
2801 return r;
785890ac 2802
511a8cfe 2803 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
60e76d48
ZJS		 2804 if (r < 0)
2805 return r;
785890ac 2806
5a27b395 2807 /* machined will MS_MOVE into that directory, and that's only supported for non-shared mounts. */
511a8cfe 2808 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
785890ac
LP		 2809}
2810
317feb4d 2811static int setup_machine_id(const char *directory) {
691675ba
LP		 2812 const char *etc_machine_id;
2813 sd_id128_t id;
3bbaff3e 2814 int r;
e01ff70a 2815
317feb4d
LP		 2816 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2817 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2818 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2819 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2820 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2821 * container behaves nicely). */
2822
e01ff70a
MS		 2823 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
2824
c5fbeedb 2825 r = id128_read(etc_machine_id, ID128_PLAIN_OR_UNINIT, &id);
317feb4d
LP		 2826 if (r < 0) {
2827 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
2828 return log_error_errno(r, "Failed to read machine ID from container image: %m");
691675ba 2829
317feb4d
LP		 2830 if (sd_id128_is_null(arg_uuid)) {
2831 r = sd_id128_randomize(&arg_uuid);
2832 if (r < 0)
2833 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
2834 }
2835 } else {
baaa35ad
ZJS		 2836 if (sd_id128_is_null(id))
2837 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2838 "Machine ID in container image is zero, refusing.");
e01ff70a 2839
317feb4d
LP		 2840 arg_uuid = id;
2841 }
691675ba 2842
e01ff70a
MS		 2843 return 0;
2844}
2845
7336138e
LP		 2846static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
2847 int r;
2848
2849 assert(directory);
2850
6c045a99 2851 if (arg_userns_mode == USER_NAMESPACE_NO || arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_CHOWN)
7336138e
LP		 2852 return 0;
2853
2854 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
2855 if (r == -EOPNOTSUPP)
2856 return log_error_errno(r, "Automatic UID/GID adjusting is only supported for UID/GID ranges starting at multiples of 2^16 with a range of 2^16.");
2857 if (r == -EBADE)
2858 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
2859 if (r < 0)
2860 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
2861 if (r == 0)
2862 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2863 else
2864 log_debug("Patched directory tree to match UID/GID range.");
2865
2866 return r;
2867}
2868
113cea80 2869/*
6d416b9c
LS		 2870 * Return values:
2871 * < 0 : wait_for_terminate() failed to get the state of the
2872 * container, the container was terminated by a signal, or
2873 * failed for an unknown reason. No change is made to the
2874 * container argument.
2875 * > 0 : The program executed in the container terminated with an
2876 * error. The exit code of the program executed in the
919699ec
LP		 2877 * container is returned. The container argument has been set
2878 * to CONTAINER_TERMINATED.
6d416b9c
LS		 2879 * 0 : The container is being rebooted, has been shut down or exited
2880 * successfully. The container argument has been set to either
2881 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
113cea80 2882 *
6d416b9c
LS		 2883 * That is, success is indicated by a return value of zero, and an
2884 * error is indicated by a non-zero value.
113cea80
DH		 2885 */
2886static int wait_for_container(pid_t pid, ContainerStatus *container) {
113cea80 2887 siginfo_t status;
919699ec 2888 int r;
113cea80
DH		 2889
2890 r = wait_for_terminate(pid, &status);
f647962d
MS		 2891 if (r < 0)
2892 return log_warning_errno(r, "Failed to wait for container: %m");
113cea80
DH		 2893
2894 switch (status.si_code) {
fddbb89c 2895
113cea80 2896 case CLD_EXITED:
b5a2179b 2897 if (status.si_status == 0)
919699ec 2898 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
b5a2179b 2899 else
919699ec 2900 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
fddbb89c 2901
919699ec
LP		 2902 *container = CONTAINER_TERMINATED;
2903 return status.si_status;
113cea80
DH		 2904
2905 case CLD_KILLED:
2906 if (status.si_status == SIGINT) {
919699ec 2907 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
113cea80 2908 *container = CONTAINER_TERMINATED;
919699ec
LP		 2909 return 0;
2910
113cea80 2911 } else if (status.si_status == SIGHUP) {
919699ec 2912 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
113cea80 2913 *container = CONTAINER_REBOOTED;
919699ec 2914 return 0;
113cea80 2915 }
919699ec 2916
4831981d 2917 _fallthrough_;
113cea80 2918 case CLD_DUMPED:
baaa35ad
ZJS		 2919 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2920 "Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
113cea80
DH		 2921
2922 default:
baaa35ad
ZJS		 2923 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2924 "Container %s failed due to unknown reason.", arg_machine);
113cea80 2925 }
113cea80
DH		 2926}
2927
023fb90b
LP		 2928static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
2929 pid_t pid;
2930
4a0b58c4 2931 pid = PTR_TO_PID(userdata);
023fb90b 2932 if (pid > 0) {
c6c8f6e2 2933 if (kill(pid, arg_kill_signal) >= 0) {
023fb90b
LP		 2934 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2935 sd_event_source_set_userdata(s, NULL);
2936 return 0;
2937 }
2938 }
2939
2940 sd_event_exit(sd_event_source_get_event(s), 0);
2941 return 0;
2942}
2943
6916b164 2944static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
abdb9b08
LP		 2945 pid_t pid;
2946
2947 assert(s);
2948 assert(ssi);
2949
2950 pid = PTR_TO_PID(userdata);
2951
6916b164
AU		 2952 for (;;) {
2953 siginfo_t si = {};
abdb9b08 2954
6916b164
AU		 2955 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
2956 return log_error_errno(errno, "Failed to waitid(): %m");
2957 if (si.si_pid == 0) /* No pending children. */
2958 break;
abdb9b08 2959 if (si.si_pid == pid) {
6916b164
AU		 2960 /* The main process we care for has exited. Return from
2961 * signal handler but leave the zombie. */
2962 sd_event_exit(sd_event_source_get_event(s), 0);
2963 break;
2964 }
abdb9b08 2965
6916b164
AU		 2966 /* Reap all other children. */
2967 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2968 }
2969
2970 return 0;
2971}
2972
abdb9b08
LP		 2973static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *error) {
2974 pid_t pid;
2975
2976 assert(m);
2977
2978 pid = PTR_TO_PID(userdata);
2979
2980 if (arg_kill_signal > 0) {
2981 log_info("Container termination requested. Attempting to halt container.");
2982 (void) kill(pid, arg_kill_signal);
2983 } else {
2984 log_info("Container termination requested. Exiting.");
2985 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m)), 0);
2986 }
2987
2988 return 0;
2989}
2990
ec16945e 2991static int determine_names(void) {
1b9cebf6 2992 int r;
ec16945e 2993
c1521918
LP		 2994 if (arg_template && !arg_directory && arg_machine) {
2995
2996 /* If --template= was specified then we should not
2997 * search for a machine, but instead create a new one
2998 * in /var/lib/machine. */
2999
657ee2d8 3000 arg_directory = path_join("/var/lib/machines", arg_machine);
c1521918
LP		 3001 if (!arg_directory)
3002 return log_oom();
3003 }
3004
ec16945e 3005 if (!arg_image && !arg_directory) {
1b9cebf6
LP		 3006 if (arg_machine) {
3007 _cleanup_(image_unrefp) Image *i = NULL;
3008
d577d4a4 3009 r = image_find(IMAGE_MACHINE, arg_machine, NULL, &i);
3a6ce860
LP		 3010 if (r == -ENOENT)
3011 return log_error_errno(r, "No image for machine '%s'.", arg_machine);
1b9cebf6
LP		 3012 if (r < 0)
3013 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
1b9cebf6 3014
eb38edce 3015 if (IN_SET(i->type, IMAGE_RAW, IMAGE_BLOCK))
0f03c2a4 3016 r = free_and_strdup(&arg_image, i->path);
1b9cebf6 3017 else
0f03c2a4 3018 r = free_and_strdup(&arg_directory, i->path);
1b9cebf6 3019 if (r < 0)
0f3be6ca 3020 return log_oom();
1b9cebf6 3021
aee327b8
LP		 3022 if (!arg_ephemeral)
3023 arg_read_only = arg_read_only || i->read_only;
d7249575
LP		 3024 } else {
3025 r = safe_getcwd(&arg_directory);
3026 if (r < 0)
3027 return log_error_errno(r, "Failed to determine current directory: %m");
3028 }
ec16945e 3029
c6147113
LP		 3030 if (!arg_directory && !arg_image)
3031 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine path, please use -D or -i.");
ec16945e
LP		 3032 }
3033
3034 if (!arg_machine) {
b9ba4dab
LP		 3035 if (arg_directory && path_equal(arg_directory, "/"))
3036 arg_machine = gethostname_malloc();
e9b88a6d
LP		 3037 else if (arg_image) {
3038 char *e;
4827ab48 3039
e9b88a6d 3040 arg_machine = strdup(basename(arg_image));
4827ab48 3041
e9b88a6d
LP		 3042 /* Truncate suffix if there is one */
3043 e = endswith(arg_machine, ".raw");
3044 if (e)
3045 *e = 0;
3046 } else
3047 arg_machine = strdup(basename(arg_directory));
ec16945e
LP		 3048 if (!arg_machine)
3049 return log_oom();
3050
ae691c1d 3051 hostname_cleanup(arg_machine);
52ef5dd7 3052 if (!hostname_is_valid(arg_machine, 0))
c6147113 3053 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine machine name automatically, please use -M.");
b9ba4dab 3054
e9b88a6d
LP		 3055 /* Add a random suffix when this is an ephemeral machine, so that we can run many
3056 * instances at once without manually having to specify -M each time. */
3057 if (arg_ephemeral)
3058 if (strextendf(&arg_machine, "-%016" PRIx64, random_u64()) < 0)
b9ba4dab 3059 return log_oom();
ec16945e
LP		 3060 }
3061
3062 return 0;
3063}
3064
8d4aa2bb 3065static int chase_symlinks_and_update(char **p, unsigned flags) {
3f342ec4
LP		 3066 char *chased;
3067 int r;
3068
3069 assert(p);
3070
3071 if (!*p)
3072 return 0;
3073
a5648b80 3074 r = chase_symlinks(*p, NULL, flags, &chased, NULL);
3f342ec4
LP		 3075 if (r < 0)
3076 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
3077
a5648b80 3078 return free_and_replace(*p, chased);
3f342ec4
LP		 3079}
3080
03cfe0d5 3081static int determine_uid_shift(const char *directory) {
6dac160c 3082
0de7acce 3083 if (arg_userns_mode == USER_NAMESPACE_NO) {
03cfe0d5 3084 arg_uid_shift = 0;
6dac160c 3085 return 0;
03cfe0d5 3086 }
6dac160c
LP		 3087
3088 if (arg_uid_shift == UID_INVALID) {
3089 struct stat st;
3090
993da6d4
LP		 3091 /* Read the UID shift off the image. Maybe we can reuse this to avoid chowning. */
3092
3093 if (stat(directory, &st) < 0)
03cfe0d5 3094 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
6dac160c
LP		 3095
3096 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
3097
baaa35ad
ZJS		 3098 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000)))
3099 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3100 "UID and GID base of %s don't match.", directory);
6dac160c
LP		 3101
3102 arg_uid_range = UINT32_C(0x10000);
f61c7f88
LP		 3103
3104 if (arg_uid_shift != 0) {
3105 /* If the image is shifted already, then we'll fall back to classic chowning, for
3106 * compatibility (and simplicity), or refuse if mapping is explicitly requested. */
3107
3108 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_AUTO) {
3109 log_debug("UID base of %s is non-zero, not using UID mapping.", directory);
3110 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3111 } else if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_MAP)
3112 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3113 "UID base of %s is not zero, UID mapping not supported.", directory);
3114 }
6dac160c
LP		 3115 }
3116
58e13de5
LP		 3117 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
3118 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID base too high for UID range.");
6dac160c 3119
6dac160c
LP		 3120 return 0;
3121}
3122
de40a303
LP		 3123static unsigned long effective_clone_ns_flags(void) {
3124 unsigned long flags = arg_clone_ns_flags;
3125
3126 if (arg_private_network)
3127 flags |= CLONE_NEWNET;
3128 if (arg_use_cgns)
3129 flags |= CLONE_NEWCGROUP;
3130 if (arg_userns_mode != USER_NAMESPACE_NO)
3131 flags |= CLONE_NEWUSER;
3132
3133 return flags;
3134}
3135
3136static int patch_sysctl(void) {
3137
3138 /* This table is inspired by runc's sysctl() function */
3139 static const struct {
3140 const char *key;
3141 bool prefix;
3142 unsigned long clone_flags;
3143 } safe_sysctl[] = {
3144 { "kernel.hostname", false, CLONE_NEWUTS },
3145 { "kernel.domainname", false, CLONE_NEWUTS },
3146 { "kernel.msgmax", false, CLONE_NEWIPC },
3147 { "kernel.msgmnb", false, CLONE_NEWIPC },
3148 { "kernel.msgmni", false, CLONE_NEWIPC },
3149 { "kernel.sem", false, CLONE_NEWIPC },
3150 { "kernel.shmall", false, CLONE_NEWIPC },
3151 { "kernel.shmmax", false, CLONE_NEWIPC },
3152 { "kernel.shmmni", false, CLONE_NEWIPC },
3153 { "fs.mqueue.", true, CLONE_NEWIPC },
3154 { "net.", true, CLONE_NEWNET },
3155 };
3156
3157 unsigned long flags;
3158 char **k, **v;
3159 int r;
3160
3161 flags = effective_clone_ns_flags();
3162
3163 STRV_FOREACH_PAIR(k, v, arg_sysctl) {
3164 bool good = false;
3165 size_t i;
3166
3167 for (i = 0; i < ELEMENTSOF(safe_sysctl); i++) {
3168
3169 if (!FLAGS_SET(flags, safe_sysctl[i].clone_flags))
3170 continue;
3171
3172 if (safe_sysctl[i].prefix)
3173 good = startswith(*k, safe_sysctl[i].key);
3174 else
3175 good = streq(*k, safe_sysctl[i].key);
3176
3177 if (good)
3178 break;
3179 }
3180
c6147113
LP		 3181 if (!good)
3182 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k);
de40a303
LP		 3183
3184 r = sysctl_write(*k, *v);
3185 if (r < 0)
3186 return log_error_errno(r, "Failed to write sysctl '%s': %m", *k);
3187 }
3188
3189 return 0;
3190}
3191
03cfe0d5
LP		 3192static int inner_child(
3193 Barrier *barrier,
3194 const char *directory,
3195 bool secondary,
3196 int kmsg_socket,
3197 int rtnl_socket,
3acc84eb 3198 int master_pty_socket,
e1bb4b0d
LB		 3199 FDSet *fds,
3200 char **os_release_pairs) {
69c79d3c 3201
03cfe0d5 3202 _cleanup_free_ char *home = NULL;
88614c8a 3203 size_t n_env = 1;
4ab3d29f
ZJS		 3204 char *envp[] = {
3205 (char*) "PATH=" DEFAULT_PATH_COMPAT,
6aadfa4c 3206 NULL, /* container */
03cfe0d5
LP		 3207 NULL, /* TERM */
3208 NULL, /* HOME */
3209 NULL, /* USER */
3210 NULL, /* LOGNAME */
3211 NULL, /* container_uuid */
3212 NULL, /* LISTEN_FDS */
3213 NULL, /* LISTEN_PID */
9c1e04d0 3214 NULL, /* NOTIFY_SOCKET */
3652872a 3215 NULL, /* CREDENTIALS_DIRECTORY */
03cfe0d5
LP		 3216 NULL
3217 };
1a68e1e5 3218 const char *exec_target;
2371271c 3219 _cleanup_strv_free_ char **env_use = NULL;
de40a303 3220 int r, which_failed;
88213476 3221
b37469d7
LP		 3222 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
3223 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
3224 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
3225 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
3226 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
3227 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
3228 * namespace.
3229 *
3230 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
3231 * unshare(). See below. */
3232
03cfe0d5
LP		 3233 assert(barrier);
3234 assert(directory);
3235 assert(kmsg_socket >= 0);
88213476 3236
de40a303
LP		 3237 log_debug("Inner child is initializing.");
3238
0de7acce 3239 if (arg_userns_mode != USER_NAMESPACE_NO) {
03cfe0d5
LP		 3240 /* Tell the parent, that it now can write the UID map. */
3241 (void) barrier_place(barrier); /* #1 */
7027ff61 3242
03cfe0d5 3243 /* Wait until the parent wrote the UID map */
baaa35ad 3244 if (!barrier_place_and_sync(barrier)) /* #2 */
2a2e78e9 3245 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
88213476 3246
2a2e78e9
LP		 3247 /* Become the new root user inside our namespace */
3248 r = reset_uid_gid();
3249 if (r < 0)
3250 return log_error_errno(r, "Couldn't become new root: %m");
3251
3252 /* Creating a new user namespace means all MS_SHARED mounts become MS_SLAVE. Let's put them
3253 * back to MS_SHARED here, since that's what we want as defaults. (This will not reconnect
3254 * propagation, but simply create new peer groups for all our mounts). */
511a8cfe 3255 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SHARED|MS_REC, NULL);
2a2e78e9
LP		 3256 if (r < 0)
3257 return r;
3258 }
6d66bd3b 3259
0de7acce 3260 r = mount_all(NULL,
4f086aab 3261 arg_mount_settings | MOUNT_IN_USERNS,
0de7acce 3262 arg_uid_shift,
0de7acce 3263 arg_selinux_apifs_context);
03cfe0d5
LP		 3264 if (r < 0)
3265 return r;
3266
04413780
ZJS		 3267 if (!arg_network_namespace_path && arg_private_network) {
3268 r = unshare(CLONE_NEWNET);
3269 if (r < 0)
3270 return log_error_errno(errno, "Failed to unshare network namespace: %m");
75116558
PS		 3271
3272 /* Tell the parent that it can setup network interfaces. */
3273 (void) barrier_place(barrier); /* #3 */
04413780
ZJS		 3274 }
3275
4f086aab 3276 r = mount_sysfs(NULL, arg_mount_settings);
d8fc6a00
LP		 3277 if (r < 0)
3278 return r;
3279
03cfe0d5
LP		 3280 /* Wait until we are cgroup-ified, so that we
3281 * can mount the right cgroup path writable */
baaa35ad
ZJS		 3282 if (!barrier_place_and_sync(barrier)) /* #4 */
3283 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
3284 "Parent died too early");
88213476 3285
489fae52 3286 if (arg_use_cgns) {
0996ef00
CB		 3287 r = unshare(CLONE_NEWCGROUP);
3288 if (r < 0)
04413780 3289 return log_error_errno(errno, "Failed to unshare cgroup namespace: %m");
0996ef00
CB		 3290 r = mount_cgroups(
3291 "",
3292 arg_unified_cgroup_hierarchy,
3293 arg_userns_mode != USER_NAMESPACE_NO,
3294 arg_uid_shift,
3295 arg_uid_range,
5a8ff0e6 3296 arg_selinux_apifs_context,
ada54120 3297 true);
1433e0f2 3298 } else
0996ef00 3299 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
1433e0f2
LP		 3300 if (r < 0)
3301 return r;
ec16945e 3302
1e4f1671 3303 r = setup_boot_id();
03cfe0d5
LP		 3304 if (r < 0)
3305 return r;
ec16945e 3306
1e4f1671 3307 r = setup_kmsg(kmsg_socket);
03cfe0d5
LP		 3308 if (r < 0)
3309 return r;
3310 kmsg_socket = safe_close(kmsg_socket);
ec16945e 3311
de40a303
LP		 3312 r = mount_custom(
3313 "/",
3314 arg_custom_mounts,
3315 arg_n_custom_mounts,
de40a303
LP		 3316 0,
3317 arg_selinux_apifs_context,
5f0a6347 3318 MOUNT_NON_ROOT_ONLY | MOUNT_IN_USERNS);
de40a303
LP		 3319 if (r < 0)
3320 return r;
3321
03cfe0d5
LP		 3322 if (setsid() < 0)
3323 return log_error_errno(errno, "setsid() failed: %m");
3324
3325 if (arg_private_network)
df883de9 3326 (void) loopback_setup();
03cfe0d5 3327
7a8f6325
LP		 3328 if (arg_expose_ports) {
3329 r = expose_port_send_rtnl(rtnl_socket);
3330 if (r < 0)
3331 return r;
3332 rtnl_socket = safe_close(rtnl_socket);
3333 }
03cfe0d5 3334
3acc84eb 3335 if (arg_console_mode != CONSOLE_PIPE) {
cd132992 3336 _cleanup_close_ int master = -1;
3acc84eb
FB		 3337 _cleanup_free_ char *console = NULL;
3338
3339 /* Allocate a pty and make it available as /dev/console. */
dc98caea 3340 master = openpt_allocate(O_RDWR|O_NONBLOCK, &console);
3acc84eb 3341 if (master < 0)
dc98caea 3342 return log_error_errno(master, "Failed to allocate a pty: %m");
3acc84eb
FB		 3343
3344 r = setup_dev_console(console);
3345 if (r < 0)
105a1a36 3346 return log_error_errno(r, "Failed to set up /dev/console: %m");
3acc84eb
FB		 3347
3348 r = send_one_fd(master_pty_socket, master, 0);
3349 if (r < 0)
3350 return log_error_errno(r, "Failed to send master fd: %m");
3351 master_pty_socket = safe_close(master_pty_socket);
3352
3353 r = setup_stdio_as_dev_console();
3354 if (r < 0)
3355 return r;
3356 }
3357
de40a303
LP		 3358 r = patch_sysctl();
3359 if (r < 0)
3360 return r;
3361
81f345df
LP		 3362 if (arg_oom_score_adjust_set) {
3363 r = set_oom_score_adjust(arg_oom_score_adjust);
3364 if (r < 0)
3365 return log_error_errno(r, "Failed to adjust OOM score: %m");
3366 }
3367
0985c7c4
ZJS		 3368 if (arg_cpu_set.set)
3369 if (sched_setaffinity(0, arg_cpu_set.allocated, arg_cpu_set.set) < 0)
d107bb7d
LP		 3370 return log_error_errno(errno, "Failed to set CPU affinity: %m");
3371
c818eef1 3372 (void) setup_hostname();
03cfe0d5 3373
050f7277 3374 if (arg_personality != PERSONALITY_INVALID) {
21022b9d
LP		 3375 r = safe_personality(arg_personality);
3376 if (r < 0)
3377 return log_error_errno(r, "personality() failed: %m");
03cfe0d5 3378 } else if (secondary) {
21022b9d
LP		 3379 r = safe_personality(PER_LINUX32);
3380 if (r < 0)
3381 return log_error_errno(r, "personality() failed: %m");
03cfe0d5
LP		 3382 }
3383
de40a303
LP		 3384 r = setrlimit_closest_all((const struct rlimit *const*) arg_rlimit, &which_failed);
3385 if (r < 0)
3386 return log_error_errno(r, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed));
3387
3388#if HAVE_SECCOMP
3389 if (arg_seccomp) {
3390
3391 if (is_seccomp_available()) {
3392
3393 r = seccomp_load(arg_seccomp);
7bc5e0b1 3394 if (ERRNO_IS_SECCOMP_FATAL(r))
de40a303
LP		 3395 return log_error_errno(r, "Failed to install seccomp filter: %m");
3396 if (r < 0)
3397 log_debug_errno(r, "Failed to install seccomp filter: %m");
3398 }
3399 } else
3400#endif
3401 {
6b000af4 3402 r = setup_seccomp(arg_caps_retain, arg_syscall_allow_list, arg_syscall_deny_list);
de40a303
LP		 3403 if (r < 0)
3404 return r;
3405 }
3406
4a4654e0 3407 if (arg_suppress_sync) {
20e458ae 3408#if HAVE_SECCOMP
4a4654e0
LP		 3409 r = seccomp_suppress_sync();
3410 if (r < 0)
3411 log_debug_errno(r, "Failed to install sync() suppression seccomp filter, ignoring: %m");
20e458ae
YW		 3412#else
3413 log_debug("systemd is built without SECCOMP support. Ignoring --suppress-sync= command line option and SuppressSync= setting.")
3414#endif
4a4654e0
LP		 3415 }
3416
349cc4a5 3417#if HAVE_SELINUX
03cfe0d5 3418 if (arg_selinux_context)
2ed96880 3419 if (setexeccon(arg_selinux_context) < 0)
03cfe0d5
LP		 3420 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
3421#endif
3422
de40a303
LP		 3423 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3424 * if we need to later on. */
3425 if (prctl(PR_SET_KEEPCAPS, 1) < 0)
3426 return log_error_errno(errno, "Failed to set PR_SET_KEEPCAPS: %m");
3427
3428 if (uid_is_valid(arg_uid) || gid_is_valid(arg_gid))
3462d773 3429 r = change_uid_gid_raw(arg_uid, arg_gid, arg_supplementary_gids, arg_n_supplementary_gids, arg_console_mode != CONSOLE_PIPE);
de40a303 3430 else
3462d773 3431 r = change_uid_gid(arg_user, arg_console_mode != CONSOLE_PIPE, &home);
03cfe0d5
LP		 3432 if (r < 0)
3433 return r;
3434
de40a303
LP		 3435 r = drop_capabilities(getuid());
3436 if (r < 0)
3437 return log_error_errno(r, "Dropping capabilities failed: %m");
3438
66edd963
LP		 3439 if (arg_no_new_privileges)
3440 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0)
3441 return log_error_errno(errno, "Failed to disable new privileges: %m");
3442
6aadfa4c
ILG		 3443 /* LXC sets container=lxc, so follow the scheme here */
3444 envp[n_env++] = strjoina("container=", arg_container_service_name);
3445
03cfe0d5
LP		 3446 envp[n_env] = strv_find_prefix(environ, "TERM=");
3447 if (envp[n_env])
313cefa1 3448 n_env++;
03cfe0d5 3449
de40a303 3450 if (home || !uid_is_valid(arg_uid) || arg_uid == 0)
4ab3d29f 3451 if (asprintf(envp + n_env++, "HOME=%s", home ?: "/root") < 0)
de40a303
LP		 3452 return log_oom();
3453
3454 if (arg_user || !uid_is_valid(arg_uid) || arg_uid == 0)
4ab3d29f
ZJS		 3455 if (asprintf(envp + n_env++, "USER=%s", arg_user ?: "root") < 0 ||
3456 asprintf(envp + n_env++, "LOGNAME=%s", arg_user ? arg_user : "root") < 0)
de40a303 3457 return log_oom();
03cfe0d5 3458
3bbaff3e 3459 assert(!sd_id128_is_null(arg_uuid));
03cfe0d5 3460
85b55869 3461 if (asprintf(envp + n_env++, "container_uuid=%s", ID128_TO_UUID_STRING(arg_uuid)) < 0)
e01ff70a 3462 return log_oom();
03cfe0d5
LP		 3463
3464 if (fdset_size(fds) > 0) {
3465 r = fdset_cloexec(fds, false);
3466 if (r < 0)
3467 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
3468
4ab3d29f
ZJS		 3469 if ((asprintf(envp + n_env++, "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
3470 (asprintf(envp + n_env++, "LISTEN_PID=1") < 0))
03cfe0d5
LP		 3471 return log_oom();
3472 }
4ab3d29f 3473 if (asprintf(envp + n_env++, "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
9c1e04d0 3474 return log_oom();
03cfe0d5 3475
3652872a
LP		 3476 if (arg_n_credentials > 0) {
3477 envp[n_env] = strdup("CREDENTIALS_DIRECTORY=/run/host/credentials");
3478 if (!envp[n_env])
3479 return log_oom();
3480 n_env++;
3481 }
3482
4ab3d29f 3483 env_use = strv_env_merge(envp, os_release_pairs, arg_setenv);
2371271c
TG		 3484 if (!env_use)
3485 return log_oom();
03cfe0d5
LP		 3486
3487 /* Let the parent know that we are ready and
3488 * wait until the parent is ready with the
3489 * setup, too... */
baaa35ad 3490 if (!barrier_place_and_sync(barrier)) /* #5 */
335d2ead 3491 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
03cfe0d5 3492
5f932eb9
LP		 3493 if (arg_chdir)
3494 if (chdir(arg_chdir) < 0)
3495 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
3496
7732f92b 3497 if (arg_start_mode == START_PID2) {
75bf701f 3498 r = stub_pid1(arg_uuid);
7732f92b
LP		 3499 if (r < 0)
3500 return r;
3501 }
3502
335d2ead
LP		 3503 if (arg_console_mode != CONSOLE_PIPE) {
3504 /* So far our pty wasn't controlled by any process. Finally, it's time to change that, if we
3505 * are configured for that. Acquire it as controlling tty. */
3506 if (ioctl(STDIN_FILENO, TIOCSCTTY) < 0)
3507 return log_error_errno(errno, "Failed to acquire controlling TTY: %m");
3508 }
3509
de40a303
LP		 3510 log_debug("Inner child completed, invoking payload.");
3511
8ca082b4
LP		 3512 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3513 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3514 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
03cfe0d5 3515 log_close();
8ca082b4
LP		 3516 log_set_open_when_needed(true);
3517
03cfe0d5
LP		 3518 (void) fdset_close_others(fds);
3519
7732f92b 3520 if (arg_start_mode == START_BOOT) {
03cfe0d5
LP		 3521 char **a;
3522 size_t m;
3523
3524 /* Automatically search for the init system */
3525
75f32f04
ZJS		 3526 m = strv_length(arg_parameters);
3527 a = newa(char*, m + 2);
3528 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
3529 a[1 + m] = NULL;
03cfe0d5 3530
ced58da7 3531 a[0] = (char*) "/usr/lib/systemd/systemd";
03cfe0d5
LP		 3532 execve(a[0], a, env_use);
3533
ced58da7 3534 a[0] = (char*) "/lib/systemd/systemd";
03cfe0d5
LP		 3535 execve(a[0], a, env_use);
3536
ced58da7 3537 a[0] = (char*) "/sbin/init";
03cfe0d5 3538 execve(a[0], a, env_use);
ced58da7
LP		 3539
3540 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
1a68e1e5 3541 } else if (!strv_isempty(arg_parameters)) {
b6b180b7
LP		 3542 const char *dollar_path;
3543
1a68e1e5 3544 exec_target = arg_parameters[0];
b6b180b7
LP		 3545
3546 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3547 * binary. */
3548 dollar_path = strv_env_get(env_use, "PATH");
3549 if (dollar_path) {
6f646e01 3550 if (setenv("PATH", dollar_path, 1) < 0)
b6b180b7
LP		 3551 return log_error_errno(errno, "Failed to update $PATH: %m");
3552 }
3553
f757855e 3554 execvpe(arg_parameters[0], arg_parameters, env_use);
1a68e1e5 3555 } else {
5f932eb9 3556 if (!arg_chdir)
d929b0f9
ZJS		 3557 /* If we cannot change the directory, we'll end up in /, that is expected. */
3558 (void) chdir(home ?: "/root");
5f932eb9 3559
03cfe0d5
LP		 3560 execle("/bin/bash", "-bash", NULL, env_use);
3561 execle("/bin/sh", "-sh", NULL, env_use);
ced58da7
LP		 3562
3563 exec_target = "/bin/bash, /bin/sh";
03cfe0d5
LP		 3564 }
3565
8ca082b4 3566 return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
03cfe0d5
LP		 3567}
3568
e96ceaba 3569static int setup_notify_child(void) {
271f518f 3570 _cleanup_close_ int fd = -1;
9c1e04d0 3571 union sockaddr_union sa = {
44ed5214
LP		 3572 .un.sun_family = AF_UNIX,
3573 .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH,
9c1e04d0
AP		 3574 };
3575 int r;
3576
3577 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3578 if (fd < 0)
3579 return log_error_errno(errno, "Failed to allocate notification socket: %m");
3580
3581 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
fbda85b0 3582 (void) sockaddr_un_unlink(&sa.un);
9c1e04d0 3583
9c1e04d0 3584 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
271f518f 3585 if (r < 0)
44ed5214 3586 return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
9c1e04d0 3587
adc7d9f0 3588 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
271f518f 3589 if (r < 0)
adc7d9f0 3590 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
adc7d9f0 3591
2ff48e98 3592 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
271f518f 3593 if (r < 0)
2ff48e98 3594 return log_error_errno(r, "SO_PASSCRED failed: %m");
9c1e04d0 3595
271f518f 3596 return TAKE_FD(fd);
9c1e04d0
AP		 3597}
3598
03cfe0d5
LP		 3599static int outer_child(
3600 Barrier *barrier,
3601 const char *directory,
2d845785 3602 DissectedImage *dissected_image,
03cfe0d5
LP		 3603 bool secondary,
3604 int pid_socket,
e01ff70a 3605 int uuid_socket,
9c1e04d0 3606 int notify_socket,
03cfe0d5
LP		 3607 int kmsg_socket,
3608 int rtnl_socket,
825d5287 3609 int uid_shift_socket,
3acc84eb 3610 int master_pty_socket,
8199d554 3611 int unified_cgroup_hierarchy_socket,
d7bea6b6
DP		 3612 FDSet *fds,
3613 int netns_fd) {
03cfe0d5 3614
2f893044 3615 _cleanup_(bind_user_context_freep) BindUserContext *bind_user_context = NULL;
e1bb4b0d 3616 _cleanup_strv_free_ char **os_release_pairs = NULL;
bf428efb 3617 _cleanup_close_ int fd = -1;
f61c7f88 3618 bool idmap = false;
e5f10caf 3619 const char *p;
03cfe0d5
LP		 3620 pid_t pid;
3621 ssize_t l;
de40a303 3622 int r;
03cfe0d5 3623
b37469d7
LP		 3624 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It already has
3625 * its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in the host's CLONE_NEWPID,
3626 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET namespaces. After it completed a number of
3627 * initializations a second child (the "inner" one) is forked off it, and it exits. */
3628
03cfe0d5
LP		 3629 assert(barrier);
3630 assert(directory);
03cfe0d5 3631 assert(pid_socket >= 0);
e01ff70a 3632 assert(uuid_socket >= 0);
9c1e04d0 3633 assert(notify_socket >= 0);
3acc84eb 3634 assert(master_pty_socket >= 0);
03cfe0d5
LP		 3635 assert(kmsg_socket >= 0);
3636
de40a303
LP		 3637 log_debug("Outer child is initializing.");
3638
e1bb4b0d
LB		 3639 r = load_os_release_pairs_with_prefix("/", "container_host_", &os_release_pairs);
3640 if (r < 0)
3641 log_debug_errno(r, "Failed to read os-release from host for container, ignoring: %m");
3642
03cfe0d5
LP		 3643 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
3644 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
3645
03cfe0d5
LP		 3646 r = reset_audit_loginuid();
3647 if (r < 0)
3648 return r;
3649
2a2e78e9
LP		 3650 /* Mark everything as slave, so that we still receive mounts from the real root, but don't propagate
3651 * mounts to the real root. */
511a8cfe 3652 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
60e76d48
ZJS		 3653 if (r < 0)
3654 return r;
03cfe0d5 3655
2d845785 3656 if (dissected_image) {
2d3a5a73
LP		 3657 /* If we are operating on a disk image, then mount its root directory now, but leave out the rest. We
3658 * can read the UID shift from it if we need to. Further down we'll mount the rest, but then with the
3659 * uid shift known. That way we can mount VFAT file systems shifted to the right place right away. This
3660 * makes sure ESP partitions and userns are compatible. */
3661
af187ab2 3662 r = dissected_image_mount_and_warn(
d04faa4e
LP		 3663 dissected_image,
3664 directory,
3665 arg_uid_shift,
21b61b1d 3666 arg_uid_range,
d04faa4e
LP		 3667 DISSECT_IMAGE_MOUNT_ROOT_ONLY|
3668 DISSECT_IMAGE_DISCARD_ON_LOOP|
3669 DISSECT_IMAGE_USR_NO_ROOT|
c65f854a 3670 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
af187ab2 3671 (arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0));
2d845785 3672 if (r < 0)
af187ab2 3673 return r;
2d845785 3674 }
03cfe0d5 3675
391567f4
LP		 3676 r = determine_uid_shift(directory);
3677 if (r < 0)
3678 return r;
3679
0de7acce 3680 if (arg_userns_mode != USER_NAMESPACE_NO) {
0e7ac751 3681 /* Let the parent know which UID shift we read from the image */
825d5287
RM		 3682 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
3683 if (l < 0)
3684 return log_error_errno(errno, "Failed to send UID shift: %m");
baaa35ad
ZJS		 3685 if (l != sizeof(arg_uid_shift))
3686 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3687 "Short write while sending UID shift.");
0e7ac751 3688
0de7acce 3689 if (arg_userns_mode == USER_NAMESPACE_PICK) {
0e7ac751
LP		 3690 /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift
3691 * we just read from the image is available. If yes, it will send the UID shift back to us, if
3692 * not it will pick a different one, and send it back to us. */
3693
3694 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
3695 if (l < 0)
3696 return log_error_errno(errno, "Failed to recv UID shift: %m");
baaa35ad
ZJS		 3697 if (l != sizeof(arg_uid_shift))
3698 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3699 "Short read while receiving UID shift.");
0e7ac751
LP		 3700 }
3701
ff6c6cc1
LP		 3702 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
3703 "Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
825d5287
RM		 3704 }
3705
6f83d3d1
LP		 3706 if (path_equal(directory, "/")) {
3707 /* If the directory we shall boot is the host, let's operate on a bind mount at a different
3708 * place, so that we can make changes to its mount structure (for example, to implement
3709 * --volatile=) without this interfering with our ability to access files such as
3710 * /etc/localtime to copy into the container. Note that we use a fixed place for this
3711 * (instead of a temporary directory, since we are living in our own mount namspace here
7802194a 3712 * already, and thus don't need to be afraid of colliding with anyone else's mounts). */
6f83d3d1
LP		 3713 (void) mkdir_p("/run/systemd/nspawn-root", 0755);
3714
511a8cfe 3715 r = mount_nofollow_verbose(LOG_ERR, "/", "/run/systemd/nspawn-root", NULL, MS_BIND|MS_REC, NULL);
6f83d3d1
LP		 3716 if (r < 0)
3717 return r;
3718
3719 directory = "/run/systemd/nspawn-root";
e50cd82f 3720 }
7d0ecdd6 3721
f61c7f88
LP		 3722 if (arg_userns_mode != USER_NAMESPACE_NO &&
3723 IN_SET(arg_userns_ownership, USER_NAMESPACE_OWNERSHIP_MAP, USER_NAMESPACE_OWNERSHIP_AUTO) &&
3724 arg_uid_shift != 0) {
3725 r = make_mount_point(directory);
3726 if (r < 0)
3727 return r;
3728
3729 r = remount_idmap(directory, arg_uid_shift, arg_uid_range);
3730 if (r == -EINVAL || ERRNO_IS_NOT_SUPPORTED(r)) {
3731 /* This might fail because the kernel or file system doesn't support idmapping. We
3732 * can't really distinguish this nicely, nor do we have any guarantees about the
3733 * error codes we see, could be EOPNOTSUPP or EINVAL. */
3734 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_AUTO)
3735 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3736 "ID mapped mounts are apparently not available, sorry.");
3737
3738 log_debug("ID mapped mounts are apparently not available on this kernel or for the selected file system, reverting to recursive chown()ing.");
3739 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3740 } else if (r < 0)
3741 return log_error_errno(r, "Failed to set up ID mapped mounts: %m");
3742 else {
3743 log_debug("ID mapped mounts available, making use of them.");
3744 idmap = true;
3745 }
3746 }
3747
7d0ecdd6
LP		 3748 r = setup_pivot_root(
3749 directory,
3750 arg_pivot_root_new,
3751 arg_pivot_root_old);
3752 if (r < 0)
3753 return r;
3754
3755 r = setup_volatile_mode(
3756 directory,
3757 arg_volatile_mode,
7d0ecdd6 3758 arg_uid_shift,
8f1ed04a 3759 arg_selinux_apifs_context);
7d0ecdd6
LP		 3760 if (r < 0)
3761 return r;
3762
2f893044
LP		 3763 r = bind_user_prepare(
3764 directory,
3765 arg_bind_user,
3766 arg_uid_shift,
3767 arg_uid_range,
3768 &arg_custom_mounts, &arg_n_custom_mounts,
3769 &bind_user_context);
3770 if (r < 0)
3771 return r;
3772
3773 if (arg_userns_mode != USER_NAMESPACE_NO && bind_user_context) {
3774 /* Send the user maps we determined to the parent, so that it installs it in our user namespace UID map table */
3775
3776 for (size_t i = 0; i < bind_user_context->n_data; i++) {
3777 uid_t map[] = {
3778 bind_user_context->data[i].payload_user->uid,
3779 bind_user_context->data[i].host_user->uid,
3780 (uid_t) bind_user_context->data[i].payload_group->gid,
3781 (uid_t) bind_user_context->data[i].host_group->gid,
3782 };
3783
3784 l = send(uid_shift_socket, map, sizeof(map), MSG_NOSIGNAL);
3785 if (l < 0)
3786 return log_error_errno(errno, "Failed to send user UID map: %m");
3787 if (l != sizeof(map))
3788 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3789 "Short write while sending user UID map.");
3790 }
3791 }
3792
5f0a6347
DDM		 3793 r = mount_custom(
3794 directory,
3795 arg_custom_mounts,
3796 arg_n_custom_mounts,
5f0a6347 3797 arg_uid_shift,
5f0a6347
DDM		 3798 arg_selinux_apifs_context,
3799 MOUNT_ROOT_ONLY);
3800 if (r < 0)
3801 return r;
3802
5530dc87 3803 /* Make sure we always have a mount that we can move to root later on. */
14a25e1f
LP		 3804 r = make_mount_point(directory);
3805 if (r < 0)
3806 return r;
5530dc87 3807
2d3a5a73
LP		 3808 if (dissected_image) {
3809 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
d04faa4e
LP		 3810 r = dissected_image_mount(
3811 dissected_image,
3812 directory,
3813 arg_uid_shift,
21b61b1d 3814 arg_uid_range,
d04faa4e
LP		 3815 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|
3816 DISSECT_IMAGE_DISCARD_ON_LOOP|
3817 DISSECT_IMAGE_USR_NO_ROOT|
f61c7f88
LP		 3818 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
3819 (idmap ? DISSECT_IMAGE_MOUNT_IDMAPPED : 0));
4fcb96ce
LP		 3820 if (r == -EUCLEAN)
3821 return log_error_errno(r, "File system check for image failed: %m");
2d3a5a73 3822 if (r < 0)
4fcb96ce 3823 return log_error_errno(r, "Failed to mount image file system: %m");
2d3a5a73
LP		 3824 }
3825
8199d554
LP		 3826 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
3827 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3828
3829 r = detect_unified_cgroup_hierarchy_from_image(directory);
3830 if (r < 0)
3831 return r;
3832
3833 l = send(unified_cgroup_hierarchy_socket, &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), MSG_NOSIGNAL);
3834 if (l < 0)
3835 return log_error_errno(errno, "Failed to send cgroup mode: %m");
baaa35ad
ZJS		 3836 if (l != sizeof(arg_unified_cgroup_hierarchy))
3837 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3838 "Short write while sending cgroup mode.");
8199d554
LP		 3839
3840 unified_cgroup_hierarchy_socket = safe_close(unified_cgroup_hierarchy_socket);
3841 }
3842
4ad14eff
LP		 3843 /* Mark everything as shared so our mounts get propagated down. This is
3844 * required to make new bind mounts available in systemd services
5238e957 3845 * inside the container that create a new mount namespace.
4ad14eff
LP		 3846 * See https://github.com/systemd/systemd/issues/3860
3847 * Further submounts (such as /dev) done after this will inherit the
5f0a6347
DDM		 3848 * shared propagation mode.
3849 *
3850 * IMPORTANT: Do not overmount the root directory anymore from now on to
3851 * enable moving the root directory mount to root later on.
3852 * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
3853 */
511a8cfe 3854 r = mount_nofollow_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
4ad14eff
LP		 3855 if (r < 0)
3856 return r;
3857
3858 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
3859 if (r < 0)
3860 return r;
3861
03cfe0d5
LP		 3862 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
3863 if (r < 0)
3864 return r;
3865
bbd407ea
DDM		 3866 if (arg_read_only && arg_volatile_mode == VOLATILE_NO &&
3867 !has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts)) {
64e82c19 3868 r = bind_remount_recursive(directory, MS_RDONLY, MS_RDONLY, NULL);
03cfe0d5
LP		 3869 if (r < 0)
3870 return log_error_errno(r, "Failed to make tree read-only: %m");
3871 }
3872
0de7acce 3873 r = mount_all(directory,
4f086aab 3874 arg_mount_settings,
0de7acce 3875 arg_uid_shift,
0de7acce 3876 arg_selinux_apifs_context);
03cfe0d5
LP		 3877 if (r < 0)
3878 return r;
3879
07fa00f9
LP		 3880 r = copy_devnodes(directory);
3881 if (r < 0)
03cfe0d5
LP		 3882 return r;
3883
de40a303
LP		 3884 r = make_extra_nodes(directory);
3885 if (r < 0)
3886 return r;
3887
3888 (void) dev_setup(directory, arg_uid_shift, arg_uid_shift);
e5f10caf 3889
9fac5029 3890 p = prefix_roota(directory, "/run/host");
e5f10caf 3891 (void) make_inaccessible_nodes(p, arg_uid_shift, arg_uid_shift);
03cfe0d5 3892
07fa00f9
LP		 3893 r = setup_pts(directory);
3894 if (r < 0)
03cfe0d5
LP		 3895 return r;
3896
3897 r = setup_propagate(directory);
3898 if (r < 0)
3899 return r;
3900
8e5430c4
LP		 3901 r = setup_keyring();
3902 if (r < 0)
3903 return r;
3904
3652872a
LP		 3905 r = setup_credentials(directory);
3906 if (r < 0)
3907 return r;
3908
2f893044
LP		 3909 r = bind_user_setup(bind_user_context, directory);
3910 if (r < 0)
3911 return r;
3912
5c4deb9a
MJ		 3913 r = mount_custom(
3914 directory,
3915 arg_custom_mounts,
3916 arg_n_custom_mounts,
3917 arg_uid_shift,
3918 arg_selinux_apifs_context,
3919 MOUNT_NON_ROOT_ONLY);
3920 if (r < 0)
3921 return r;
3922
03cfe0d5
LP		 3923 r = setup_timezone(directory);
3924 if (r < 0)
3925 return r;
3926
3927 r = setup_resolv_conf(directory);
3928 if (r < 0)
3929 return r;
3930
e01ff70a
MS		 3931 r = setup_machine_id(directory);
3932 if (r < 0)
3933 return r;
3934
03cfe0d5
LP		 3935 r = setup_journal(directory);
3936 if (r < 0)
3937 return r;
3938
0f48ba7b
LP		 3939 /* The same stuff as the $container env var, but nicely readable for the entire payload */
3940 p = prefix_roota(directory, "/run/host/container-manager");
3941 (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE);
3942
3943 /* The same stuff as the $container_uuid env var */
3944 p = prefix_roota(directory, "/run/host/container-uuid");
3945 (void) write_string_filef(p, WRITE_STRING_FILE_CREATE, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
3946
489fae52 3947 if (!arg_use_cgns) {
0996ef00
CB		 3948 r = mount_cgroups(
3949 directory,
3950 arg_unified_cgroup_hierarchy,
3951 arg_userns_mode != USER_NAMESPACE_NO,
3952 arg_uid_shift,
3953 arg_uid_range,
5a8ff0e6 3954 arg_selinux_apifs_context,
ada54120 3955 false);
0996ef00
CB		 3956 if (r < 0)
3957 return r;
3958 }
03cfe0d5
LP		 3959
3960 r = mount_move_root(directory);
3961 if (r < 0)
3962 return log_error_errno(r, "Failed to move root directory: %m");
3963
e96ceaba 3964 fd = setup_notify_child();
9c1e04d0
AP		 3965 if (fd < 0)
3966 return fd;
3967
03cfe0d5 3968 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
0c582db0 3969 arg_clone_ns_flags |
8869a0b4 3970 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
03cfe0d5
LP		 3971 if (pid < 0)
3972 return log_error_errno(errno, "Failed to fork inner child: %m");
03cfe0d5
LP		 3973 if (pid == 0) {
3974 pid_socket = safe_close(pid_socket);
e01ff70a 3975 uuid_socket = safe_close(uuid_socket);
9c1e04d0 3976 notify_socket = safe_close(notify_socket);
825d5287 3977 uid_shift_socket = safe_close(uid_shift_socket);
03cfe0d5 3978
2a2e78e9
LP		 3979 /* The inner child has all namespaces that are requested, so that we all are owned by the
3980 * user if user namespaces are turned on. */
03cfe0d5 3981
d7bea6b6
DP		 3982 if (arg_network_namespace_path) {
3983 r = namespace_enter(-1, -1, netns_fd, -1, -1);
3984 if (r < 0)
e2d39e54 3985 return log_error_errno(r, "Failed to join network namespace: %m");
d7bea6b6
DP		 3986 }
3987
e1bb4b0d 3988 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, master_pty_socket, fds, os_release_pairs);
03cfe0d5
LP		 3989 if (r < 0)
3990 _exit(EXIT_FAILURE);
3991
3992 _exit(EXIT_SUCCESS);
3993 }
3994
3995 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
3996 if (l < 0)
3997 return log_error_errno(errno, "Failed to send PID: %m");
baaa35ad
ZJS		 3998 if (l != sizeof(pid))
3999 return log_error_errno(SYNTHETIC_ERRNO(EIO),
4000 "Short write while sending PID.");
03cfe0d5 4001
e01ff70a
MS		 4002 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
4003 if (l < 0)
4004 return log_error_errno(errno, "Failed to send machine ID: %m");
baaa35ad
ZJS		 4005 if (l != sizeof(arg_uuid))
4006 return log_error_errno(SYNTHETIC_ERRNO(EIO),
4007 "Short write while sending machine ID.");
e01ff70a 4008
9c1e04d0
AP		 4009 l = send_one_fd(notify_socket, fd, 0);
4010 if (l < 0)
ba72801d 4011 return log_error_errno(l, "Failed to send notify fd: %m");
9c1e04d0 4012
03cfe0d5 4013 pid_socket = safe_close(pid_socket);
e01ff70a 4014 uuid_socket = safe_close(uuid_socket);
9c1e04d0 4015 notify_socket = safe_close(notify_socket);
3acc84eb 4016 master_pty_socket = safe_close(master_pty_socket);
327e26d6
KN		 4017 kmsg_socket = safe_close(kmsg_socket);
4018 rtnl_socket = safe_close(rtnl_socket);
d7bea6b6 4019 netns_fd = safe_close(netns_fd);
03cfe0d5
LP		 4020
4021 return 0;
4022}
4023
0e7ac751 4024static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
d381c8a6 4025 bool tried_hashed = false;
0e7ac751
LP		 4026 unsigned n_tries = 100;
4027 uid_t candidate;
4028 int r;
4029
4030 assert(shift);
4031 assert(ret_lock_file);
0de7acce 4032 assert(arg_userns_mode == USER_NAMESPACE_PICK);
0e7ac751
LP		 4033 assert(arg_uid_range == 0x10000U);
4034
4035 candidate = *shift;
4036
4037 (void) mkdir("/run/systemd/nspawn-uid", 0755);
4038
4039 for (;;) {
fbd0b64f 4040 char lock_path[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
8e766630 4041 _cleanup_(release_lock_file) LockFile lf = LOCK_FILE_INIT;
0e7ac751
LP		 4042
4043 if (--n_tries <= 0)
4044 return -EBUSY;
4045
87d5e4f2 4046 if (candidate < CONTAINER_UID_BASE_MIN || candidate > CONTAINER_UID_BASE_MAX)
0e7ac751
LP		 4047 goto next;
4048 if ((candidate & UINT32_C(0xFFFF)) != 0)
4049 goto next;
4050
4051 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
4052 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
4053 if (r == -EBUSY) /* Range already taken by another nspawn instance */
4054 goto next;
4055 if (r < 0)
4056 return r;
4057
4058 /* Make some superficial checks whether the range is currently known in the user database */
4059 if (getpwuid(candidate))
4060 goto next;
4061 if (getpwuid(candidate + UINT32_C(0xFFFE)))
4062 goto next;
4063 if (getgrgid(candidate))
4064 goto next;
4065 if (getgrgid(candidate + UINT32_C(0xFFFE)))
4066 goto next;
4067
4068 *ret_lock_file = lf;
4069 lf = (struct LockFile) LOCK_FILE_INIT;
4070 *shift = candidate;
4071 return 0;
4072
4073 next:
d381c8a6
LP		 4074 if (arg_machine && !tried_hashed) {
4075 /* Try to hash the base from the container name */
4076
4077 static const uint8_t hash_key[] = {
4078 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
4079 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
4080 };
4081
4082 candidate = (uid_t) siphash24(arg_machine, strlen(arg_machine), hash_key);
4083
4084 tried_hashed = true;
4085 } else
4086 random_bytes(&candidate, sizeof(candidate));
4087
87d5e4f2 4088 candidate = (candidate % (CONTAINER_UID_BASE_MAX - CONTAINER_UID_BASE_MIN)) + CONTAINER_UID_BASE_MIN;
0e7ac751
LP		 4089 candidate &= (uid_t) UINT32_C(0xFFFF0000);
4090 }
4091}
4092
2f893044
LP		 4093static int add_one_uid_map(
4094 char **p,
4095 uid_t container_uid,
4096 uid_t host_uid,
4097 uid_t range) {
4098
4099 return strextendf(p,
4100 UID_FMT " " UID_FMT " " UID_FMT "\n",
4101 container_uid, host_uid, range);
4102}
4103
4104static int make_uid_map_string(
4105 const uid_t bind_user_uid[],
4106 size_t n_bind_user_uid,
4107 size_t offset,
4108 char **ret) {
4109
4110 _cleanup_free_ char *s = NULL;
4111 uid_t previous_uid = 0;
4112 int r;
4113
4114 assert(n_bind_user_uid == 0 || bind_user_uid);
2f092762 4115 assert(IN_SET(offset, 0, 2)); /* used to switch between UID and GID map */
2f893044
LP		 4116 assert(ret);
4117
4118 /* The bind_user_uid[] array is a series of 4 uid_t values, for each --bind-user= entry one
4119 * quadruplet, consisting of host and container UID + GID. */
4120
4121 for (size_t i = 0; i < n_bind_user_uid; i++) {
4122 uid_t payload_uid = bind_user_uid[i*2+offset],
4123 host_uid = bind_user_uid[i*2+offset+1];
4124
4125 assert(previous_uid <= payload_uid);
4126 assert(payload_uid < arg_uid_range);
4127
4128 /* Add a range to close the gap to previous entry */
4129 if (payload_uid > previous_uid) {
4130 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, payload_uid - previous_uid);
4131 if (r < 0)
4132 return r;
4133 }
4134
4135 /* Map this specific user */
4136 r = add_one_uid_map(&s, payload_uid, host_uid, 1);
4137 if (r < 0)
4138 return r;
4139
4140 previous_uid = payload_uid + 1;
4141 }
4142
4143 /* And add a range to close the gap to finish the range */
4144 if (arg_uid_range > previous_uid) {
4145 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, arg_uid_range - previous_uid);
4146 if (r < 0)
4147 return r;
4148 }
4149
4150 assert(s);
4151
4152 *ret = TAKE_PTR(s);
4153 return 0;
4154}
4155
4156static int setup_uid_map(
4157 pid_t pid,
4158 const uid_t bind_user_uid[],
4159 size_t n_bind_user_uid) {
4160
4161 char uid_map[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1];
4162 _cleanup_free_ char *s = NULL;
03cfe0d5
LP		 4163 int r;
4164
4165 assert(pid > 1);
4166
2f893044
LP		 4167 /* Build the UID map string */
4168 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 0, &s) < 0) /* offset=0 contains the UID pair */
4169 return log_oom();
4170
03cfe0d5 4171 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
2f893044 4172 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
03cfe0d5
LP		 4173 if (r < 0)
4174 return log_error_errno(r, "Failed to write UID map: %m");
4175
2f893044
LP		 4176 /* And now build the GID map string */
4177 s = mfree(s);
4178 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 2, &s) < 0) /* offset=2 contains the GID pair */
4179 return log_oom();
4180
03cfe0d5 4181 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
2f893044 4182 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
03cfe0d5
LP		 4183 if (r < 0)
4184 return log_error_errno(r, "Failed to write GID map: %m");
4185
4186 return 0;
4187}
4188
9c1e04d0 4189static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
9c1e04d0
AP		 4190 char buf[NOTIFY_BUFFER_MAX+1];
4191 char *p = NULL;
4192 struct iovec iovec = {
4193 .iov_base = buf,
4194 .iov_len = sizeof(buf)-1,
4195 };
fb29cdbe
LP		 4196 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
4197 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control;
9c1e04d0
AP		 4198 struct msghdr msghdr = {
4199 .msg_iov = &iovec,
4200 .msg_iovlen = 1,
4201 .msg_control = &control,
4202 .msg_controllen = sizeof(control),
4203 };
371d72e0 4204 struct ucred *ucred;
9c1e04d0
AP		 4205 ssize_t n;
4206 pid_t inner_child_pid;
4207 _cleanup_strv_free_ char **tags = NULL;
4208
4209 assert(userdata);
4210
4211 inner_child_pid = PTR_TO_PID(userdata);
4212
4213 if (revents != EPOLLIN) {
4214 log_warning("Got unexpected poll event for notify fd.");
4215 return 0;
4216 }
4217
3691bcf3
LP		 4218 n = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
4219 if (IN_SET(n, -EAGAIN, -EINTR))
4220 return 0;
741bfd7f
LP		 4221 if (n == -EXFULL) {
4222 log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
4223 return 0;
4224 }
3691bcf3
LP		 4225 if (n < 0)
4226 return log_warning_errno(n, "Couldn't read notification socket: %m");
9c1e04d0 4227
9c1e04d0
AP		 4228 cmsg_close_all(&msghdr);
4229
371d72e0 4230 ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred);
9c1e04d0 4231 if (!ucred || ucred->pid != inner_child_pid) {
8cb57430 4232 log_debug("Received notify message without valid credentials. Ignoring.");
9c1e04d0
AP		 4233 return 0;
4234 }
4235
4236 if ((size_t) n >= sizeof(buf)) {
4237 log_warning("Received notify message exceeded maximum size. Ignoring.");
4238 return 0;
4239 }
4240
4241 buf[n] = 0;
4242 tags = strv_split(buf, "\n\r");
4243 if (!tags)
4244 return log_oom();
4245
4246 if (strv_find(tags, "READY=1"))
04f590a4 4247 (void) sd_notifyf(false, "READY=1\n");
9c1e04d0
AP		 4248
4249 p = strv_find_startswith(tags, "STATUS=");
4250 if (p)
04f590a4 4251 (void) sd_notifyf(false, "STATUS=Container running: %s", p);
9c1e04d0
AP		 4252
4253 return 0;
4254}
4255
e96ceaba 4256static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
9c1e04d0 4257 int r;
9c1e04d0 4258
5773024d 4259 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
9c1e04d0
AP		 4260 if (r < 0)
4261 return log_error_errno(r, "Failed to allocate notify event source: %m");
4262
5773024d 4263 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
9c1e04d0
AP		 4264
4265 return 0;
4266}
4267
5d961407
LP		 4268static int merge_settings(Settings *settings, const char *path) {
4269 int rl;
f757855e 4270
5d961407
LP		 4271 assert(settings);
4272 assert(path);
f757855e 4273
5d961407
LP		 4274 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
4275 * that this steals the fields of the Settings* structure, and hence modifies it. */
f757855e 4276
7732f92b
LP		 4277 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
4278 settings->start_mode >= 0) {
4279 arg_start_mode = settings->start_mode;
130d3d22 4280 strv_free_and_replace(arg_parameters, settings->parameters);
f757855e
LP		 4281 }
4282
a2f577fc
JL		 4283 if ((arg_settings_mask & SETTING_EPHEMERAL) == 0)
4284 arg_ephemeral = settings->ephemeral;
4285
de40a303
LP		 4286 if ((arg_settings_mask & SETTING_DIRECTORY) == 0 &&
4287 settings->root) {
4288
4289 if (!arg_settings_trusted)
4290 log_warning("Ignoring root directory setting, file %s is not trusted.", path);
4291 else
4292 free_and_replace(arg_directory, settings->root);
4293 }
4294
b53ede69
PW		 4295 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
4296 settings->pivot_root_new) {
4297 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
4298 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
4299 }
4300
5f932eb9 4301 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
1cc6c93a
YW		 4302 settings->working_directory)
4303 free_and_replace(arg_chdir, settings->working_directory);
5f932eb9 4304
f757855e 4305 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
130d3d22
YW		 4306 settings->environment)
4307 strv_free_and_replace(arg_setenv, settings->environment);
f757855e 4308
de40a303
LP		 4309 if ((arg_settings_mask & SETTING_USER) == 0) {
4310
4311 if (settings->user)
4312 free_and_replace(arg_user, settings->user);
4313
4314 if (uid_is_valid(settings->uid))
4315 arg_uid = settings->uid;
4316 if (gid_is_valid(settings->gid))
4317 arg_gid = settings->gid;
4318 if (settings->n_supplementary_gids > 0) {
4319 free_and_replace(arg_supplementary_gids, settings->supplementary_gids);
4320 arg_n_supplementary_gids = settings->n_supplementary_gids;
4321 }
4322 }
f757855e
LP		 4323
4324 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
a3fc6b55 4325 uint64_t plus, minus;
7be830c6 4326 uint64_t network_minus = 0;
88fc9c9b 4327 uint64_t ambient;
f757855e 4328
de40a303
LP		 4329 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
4330 * Settings structure */
4331
0e265674 4332 plus = settings->capability;
a3fc6b55
LP		 4333 minus = settings->drop_capability;
4334
4335 if ((arg_settings_mask & SETTING_NETWORK) == 0) {
4336 if (settings_private_network(settings))
4337 plus |= UINT64_C(1) << CAP_NET_ADMIN;
4338 else
7be830c6 4339 network_minus |= UINT64_C(1) << CAP_NET_ADMIN;
a3fc6b55 4340 }
0e265674
LP		 4341
4342 if (!arg_settings_trusted && plus != 0) {
4343 if (settings->capability != 0)
5d961407 4344 log_warning("Ignoring Capability= setting, file %s is not trusted.", path);
7be830c6
TH		 4345 } else {
4346 arg_caps_retain &= ~network_minus;
520e0d54 4347 arg_caps_retain |= plus;
7be830c6 4348 }
f757855e 4349
a3fc6b55 4350 arg_caps_retain &= ~minus;
de40a303
LP		 4351
4352 /* Copy the full capabilities over too */
4353 if (capability_quintet_is_set(&settings->full_capabilities)) {
4354 if (!arg_settings_trusted)
5238e957 4355 log_warning("Ignoring capability settings, file %s is not trusted.", path);
de40a303
LP		 4356 else
4357 arg_full_capabilities = settings->full_capabilities;
4358 }
88fc9c9b
TH		 4359
4360 ambient = settings->ambient_capability;
4361 if (!arg_settings_trusted && ambient != 0)
4362 log_warning("Ignoring AmbientCapability= setting, file %s is not trusted.", path);
4363 else
4364 arg_caps_ambient |= ambient;
f757855e
LP		 4365 }
4366
4367 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
4368 settings->kill_signal > 0)
4369 arg_kill_signal = settings->kill_signal;
4370
4371 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
4372 settings->personality != PERSONALITY_INVALID)
4373 arg_personality = settings->personality;
4374
4375 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
4376 !sd_id128_is_null(settings->machine_id)) {
4377
4378 if (!arg_settings_trusted)
5d961407 4379 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path);
f757855e
LP		 4380 else
4381 arg_uuid = settings->machine_id;
4382 }
4383
4384 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
4385 settings->read_only >= 0)
4386 arg_read_only = settings->read_only;
4387
4388 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
4389 settings->volatile_mode != _VOLATILE_MODE_INVALID)
4390 arg_volatile_mode = settings->volatile_mode;
4391
4392 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
4393 settings->n_custom_mounts > 0) {
4394
4395 if (!arg_settings_trusted)
5d961407 4396 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path);
f757855e
LP		 4397 else {
4398 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
1cc6c93a 4399 arg_custom_mounts = TAKE_PTR(settings->custom_mounts);
f757855e 4400 arg_n_custom_mounts = settings->n_custom_mounts;
f757855e
LP		 4401 settings->n_custom_mounts = 0;
4402 }
4403 }
4404
4405 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
4406 (settings->private_network >= 0 ||
4407 settings->network_veth >= 0 ||
4408 settings->network_bridge ||
22b28dfd 4409 settings->network_zone ||
f757855e
LP		 4410 settings->network_interfaces ||
4411 settings->network_macvlan ||
f6d6bad1 4412 settings->network_ipvlan ||
de40a303
LP		 4413 settings->network_veth_extra ||
4414 settings->network_namespace_path)) {
f757855e
LP		 4415
4416 if (!arg_settings_trusted)
5d961407 4417 log_warning("Ignoring network settings, file %s is not trusted.", path);
f757855e 4418 else {
f6d6bad1 4419 arg_network_veth = settings_network_veth(settings);
0e265674
LP		 4420 arg_private_network = settings_private_network(settings);
4421
130d3d22
YW		 4422 strv_free_and_replace(arg_network_interfaces, settings->network_interfaces);
4423 strv_free_and_replace(arg_network_macvlan, settings->network_macvlan);
4424 strv_free_and_replace(arg_network_ipvlan, settings->network_ipvlan);
4425 strv_free_and_replace(arg_network_veth_extra, settings->network_veth_extra);
f6d6bad1 4426
1cc6c93a
YW		 4427 free_and_replace(arg_network_bridge, settings->network_bridge);
4428 free_and_replace(arg_network_zone, settings->network_zone);
de40a303
LP		 4429
4430 free_and_replace(arg_network_namespace_path, settings->network_namespace_path);
f757855e
LP		 4431 }
4432 }
4433
4434 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
4435 settings->expose_ports) {
4436
4437 if (!arg_settings_trusted)
5d961407 4438 log_warning("Ignoring Port= setting, file %s is not trusted.", path);
f757855e
LP		 4439 else {
4440 expose_port_free_all(arg_expose_ports);
1cc6c93a 4441 arg_expose_ports = TAKE_PTR(settings->expose_ports);
f757855e
LP		 4442 }
4443 }
4444
0de7acce
LP		 4445 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
4446 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
4447
4448 if (!arg_settings_trusted)
5d961407 4449 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path);
0de7acce
LP		 4450 else {
4451 arg_userns_mode = settings->userns_mode;
4452 arg_uid_shift = settings->uid_shift;
4453 arg_uid_range = settings->uid_range;
6c045a99 4454 arg_userns_ownership = settings->userns_ownership;
0de7acce
LP		 4455 }
4456 }
4457
2f893044
LP		 4458 if ((arg_settings_mask & SETTING_BIND_USER) == 0)
4459 strv_free_and_replace(arg_bind_user, settings->bind_user);
4460
9c1e04d0
AP		 4461 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0)
4462 arg_notify_ready = settings->notify_ready;
4463
960e4569
LP		 4464 if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) {
4465
6b000af4 4466 if (!arg_settings_trusted && !strv_isempty(settings->syscall_allow_list))
5d961407 4467 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path);
960e4569 4468 else {
6b000af4
LP		 4469 strv_free_and_replace(arg_syscall_allow_list, settings->syscall_allow_list);
4470 strv_free_and_replace(arg_syscall_deny_list, settings->syscall_deny_list);
960e4569 4471 }
de40a303
LP		 4472
4473#if HAVE_SECCOMP
4474 if (!arg_settings_trusted && settings->seccomp)
4475 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path);
4476 else {
4477 seccomp_release(arg_seccomp);
4478 arg_seccomp = TAKE_PTR(settings->seccomp);
4479 }
4480#endif
960e4569
LP		 4481 }
4482
bf428efb
LP		 4483 for (rl = 0; rl < _RLIMIT_MAX; rl ++) {
4484 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)))
4485 continue;
4486
4487 if (!settings->rlimit[rl])
4488 continue;
4489
4490 if (!arg_settings_trusted) {
5d961407 4491 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl), path);
bf428efb
LP		 4492 continue;
4493 }
4494
4495 free_and_replace(arg_rlimit[rl], settings->rlimit[rl]);
4496 }
4497
3a9530e5
LP		 4498 if ((arg_settings_mask & SETTING_HOSTNAME) == 0 &&
4499 settings->hostname)
4500 free_and_replace(arg_hostname, settings->hostname);
4501
66edd963
LP		 4502 if ((arg_settings_mask & SETTING_NO_NEW_PRIVILEGES) == 0 &&
4503 settings->no_new_privileges >= 0)
4504 arg_no_new_privileges = settings->no_new_privileges;
4505
81f345df
LP		 4506 if ((arg_settings_mask & SETTING_OOM_SCORE_ADJUST) == 0 &&
4507 settings->oom_score_adjust_set) {
4508
4509 if (!arg_settings_trusted)
5d961407 4510 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path);
81f345df
LP		 4511 else {
4512 arg_oom_score_adjust = settings->oom_score_adjust;
4513 arg_oom_score_adjust_set = true;
4514 }
4515 }
4516
d107bb7d 4517 if ((arg_settings_mask & SETTING_CPU_AFFINITY) == 0 &&
0985c7c4 4518 settings->cpu_set.set) {
d107bb7d
LP		 4519
4520 if (!arg_settings_trusted)
5d961407 4521 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path);
d107bb7d 4522 else {
0985c7c4
ZJS		 4523 cpu_set_reset(&arg_cpu_set);
4524 arg_cpu_set = settings->cpu_set;
4525 settings->cpu_set = (CPUSet) {};
d107bb7d
LP		 4526 }
4527 }
4528
09d423e9
LP		 4529 if ((arg_settings_mask & SETTING_RESOLV_CONF) == 0 &&
4530 settings->resolv_conf != _RESOLV_CONF_MODE_INVALID)
4531 arg_resolv_conf = settings->resolv_conf;
4532
4e1d6aa9
LP		 4533 if ((arg_settings_mask & SETTING_LINK_JOURNAL) == 0 &&
4534 settings->link_journal != _LINK_JOURNAL_INVALID) {
4535
4536 if (!arg_settings_trusted)
4537 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path);
4538 else {
4539 arg_link_journal = settings->link_journal;
4540 arg_link_journal_try = settings->link_journal_try;
4541 }
4542 }
4543
1688841f
LP		 4544 if ((arg_settings_mask & SETTING_TIMEZONE) == 0 &&
4545 settings->timezone != _TIMEZONE_MODE_INVALID)
4546 arg_timezone = settings->timezone;
4547
de40a303
LP		 4548 if ((arg_settings_mask & SETTING_SLICE) == 0 &&
4549 settings->slice) {
4550
4551 if (!arg_settings_trusted)
4552 log_warning("Ignoring slice setting, file '%s' is not trusted.", path);
4553 else
4554 free_and_replace(arg_slice, settings->slice);
4555 }
4556
4557 if ((arg_settings_mask & SETTING_USE_CGNS) == 0 &&
4558 settings->use_cgns >= 0) {
4559
4560 if (!arg_settings_trusted)
4561 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path);
4562 else
4563 arg_use_cgns = settings->use_cgns;
4564 }
4565
4566 if ((arg_settings_mask & SETTING_CLONE_NS_FLAGS) == 0 &&
f5fbe71d 4567 settings->clone_ns_flags != ULONG_MAX) {
de40a303
LP		 4568
4569 if (!arg_settings_trusted)
4570 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path);
4571 else
4572 arg_clone_ns_flags = settings->clone_ns_flags;
4573 }
4574
4575 if ((arg_settings_mask & SETTING_CONSOLE_MODE) == 0 &&
4576 settings->console_mode >= 0) {
4577
4578 if (!arg_settings_trusted)
4579 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path);
4580 else
4581 arg_console_mode = settings->console_mode;
4582 }
4583
4a4654e0
LP		 4584 if ((arg_settings_mask & SETTING_SUPPRESS_SYNC) == 0)
4585 arg_suppress_sync = settings->suppress_sync;
4586
de40a303
LP		 4587 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
4588 * don't consult arg_settings_mask for them. */
4589
4590 sd_bus_message_unref(arg_property_message);
4591 arg_property_message = TAKE_PTR(settings->properties);
4592
4593 arg_console_width = settings->console_width;
4594 arg_console_height = settings->console_height;
4595
b2645747 4596 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
de40a303
LP		 4597 arg_extra_nodes = TAKE_PTR(settings->extra_nodes);
4598 arg_n_extra_nodes = settings->n_extra_nodes;
4599
f757855e
LP		 4600 return 0;
4601}
4602
5d961407
LP		 4603static int load_settings(void) {
4604 _cleanup_(settings_freep) Settings *settings = NULL;
4605 _cleanup_fclose_ FILE *f = NULL;
4606 _cleanup_free_ char *p = NULL;
4607 const char *fn, *i;
4608 int r;
4609
de40a303
LP		 4610 if (arg_oci_bundle)
4611 return 0;
4612
5d961407
LP		 4613 /* If all settings are masked, there's no point in looking for
4614 * the settings file */
d7a0f1f4 4615 if (FLAGS_SET(arg_settings_mask, _SETTINGS_MASK_ALL))
5d961407
LP		 4616 return 0;
4617
4618 fn = strjoina(arg_machine, ".nspawn");
4619
4620 /* We first look in the admin's directories in /etc and /run */
4621 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
4622 _cleanup_free_ char *j = NULL;
4623
657ee2d8 4624 j = path_join(i, fn);
5d961407
LP		 4625 if (!j)
4626 return log_oom();
4627
4628 f = fopen(j, "re");
4629 if (f) {
4630 p = TAKE_PTR(j);
4631
4632 /* By default, we trust configuration from /etc and /run */
4633 if (arg_settings_trusted < 0)
4634 arg_settings_trusted = true;
4635
4636 break;
4637 }
4638
4639 if (errno != ENOENT)
4640 return log_error_errno(errno, "Failed to open %s: %m", j);
4641 }
4642
4643 if (!f) {
4644 /* After that, let's look for a file next to the
4645 * actual image we shall boot. */
4646
4647 if (arg_image) {
4648 p = file_in_same_dir(arg_image, fn);
4649 if (!p)
4650 return log_oom();
cd6e3914 4651 } else if (arg_directory && !path_equal(arg_directory, "/")) {
5d961407
LP		 4652 p = file_in_same_dir(arg_directory, fn);
4653 if (!p)
4654 return log_oom();
4655 }
4656
4657 if (p) {
4658 f = fopen(p, "re");
4659 if (!f && errno != ENOENT)
4660 return log_error_errno(errno, "Failed to open %s: %m", p);
4661
4662 /* By default, we do not trust configuration from /var/lib/machines */
4663 if (arg_settings_trusted < 0)
4664 arg_settings_trusted = false;
4665 }
4666 }
4667
4668 if (!f)
4669 return 0;
4670
4671 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
4672
4673 r = settings_load(f, p, &settings);
4674 if (r < 0)
4675 return r;
4676
4677 return merge_settings(settings, p);
4678}
4679
de40a303
LP		 4680static int load_oci_bundle(void) {
4681 _cleanup_(settings_freep) Settings *settings = NULL;
4682 int r;
4683
4684 if (!arg_oci_bundle)
4685 return 0;
4686
4687 /* By default let's trust OCI bundles */
4688 if (arg_settings_trusted < 0)
4689 arg_settings_trusted = true;
4690
4691 r = oci_load(NULL, arg_oci_bundle, &settings);
4692 if (r < 0)
4693 return r;
4694
4695 return merge_settings(settings, arg_oci_bundle);
4696}
4697
3acc84eb 4698static int run_container(
2d845785 4699 DissectedImage *dissected_image,
b0067625
ZJS		 4700 bool secondary,
4701 FDSet *fds,
4702 char veth_name[IFNAMSIZ], bool *veth_created,
761cf19d 4703 struct ExposeArgs *expose_args,
3acc84eb 4704 int *master, pid_t *pid, int *ret) {
b0067625
ZJS		 4705
4706 static const struct sigaction sa = {
4707 .sa_handler = nop_signal_handler,
e28c7cd0 4708 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
b0067625
ZJS		 4709 };
4710
8e766630 4711 _cleanup_(release_lock_file) LockFile uid_shift_lock = LOCK_FILE_INIT;
b0067625
ZJS		 4712 _cleanup_close_ int etc_passwd_lock = -1;
4713 _cleanup_close_pair_ int
4714 kmsg_socket_pair[2] = { -1, -1 },
4715 rtnl_socket_pair[2] = { -1, -1 },
4716 pid_socket_pair[2] = { -1, -1 },
4717 uuid_socket_pair[2] = { -1, -1 },
4718 notify_socket_pair[2] = { -1, -1 },
8199d554 4719 uid_shift_socket_pair[2] = { -1, -1 },
3acc84eb 4720 master_pty_socket_pair[2] = { -1, -1 },
8199d554
LP		 4721 unified_cgroup_hierarchy_socket_pair[2] = { -1, -1};
4722
3acc84eb 4723 _cleanup_close_ int notify_socket = -1;
b0067625 4724 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
5773024d 4725 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
b0067625
ZJS		 4726 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
4727 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
4728 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
abdb9b08 4729 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
2f893044
LP		 4730 _cleanup_free_ uid_t *bind_user_uid = NULL;
4731 size_t n_bind_user_uid = 0;
b0067625 4732 ContainerStatus container_status = 0;
b0067625
ZJS		 4733 int ifi = 0, r;
4734 ssize_t l;
4735 sigset_t mask_chld;
5b4855ab 4736 _cleanup_close_ int child_netns_fd = -1;
b0067625
ZJS		 4737
4738 assert_se(sigemptyset(&mask_chld) == 0);
4739 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
4740
4741 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4742 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4743 * check with getpwuid() if the specific user already exists. Note that /etc might be
4744 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4745 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4746 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4747 * really ours. */
4748
4749 etc_passwd_lock = take_etc_passwd_lock(NULL);
4750 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
4751 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
4752 }
4753
4754 r = barrier_create(&barrier);
4755 if (r < 0)
4756 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
4757
4758 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
4759 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
4760
4761 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
4762 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
4763
4764 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
4765 return log_error_errno(errno, "Failed to create pid socket pair: %m");
4766
4767 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
4768 return log_error_errno(errno, "Failed to create id socket pair: %m");
4769
4770 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
4771 return log_error_errno(errno, "Failed to create notify socket pair: %m");
4772
3acc84eb
FB		 4773 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, master_pty_socket_pair) < 0)
4774 return log_error_errno(errno, "Failed to create console socket pair: %m");
4775
b0067625
ZJS		 4776 if (arg_userns_mode != USER_NAMESPACE_NO)
4777 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
4778 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
4779
8199d554
LP		 4780 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN)
4781 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, unified_cgroup_hierarchy_socket_pair) < 0)
4782 return log_error_errno(errno, "Failed to create unified cgroup socket pair: %m");
4783
b0067625
ZJS		 4784 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4785 * parent's blocking calls and give it a chance to call wait() and terminate. */
4786 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
4787 if (r < 0)
4788 return log_error_errno(errno, "Failed to change the signal mask: %m");
4789
4790 r = sigaction(SIGCHLD, &sa, NULL);
4791 if (r < 0)
4792 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
4793
d7bea6b6 4794 if (arg_network_namespace_path) {
5b4855ab
DDM		 4795 child_netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
4796 if (child_netns_fd < 0)
d7bea6b6
DP		 4797 return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path);
4798
54c2459d 4799 r = fd_is_ns(child_netns_fd, CLONE_NEWNET);
6619ad88
LP		 4800 if (r == -EUCLEAN)
4801 log_debug_errno(r, "Cannot determine if passed network namespace path '%s' really refers to a network namespace, assuming it does.", arg_network_namespace_path);
4802 else if (r < 0)
d7bea6b6 4803 return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path);
c6147113
LP		 4804 else if (r == 0)
4805 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4806 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path);
d7bea6b6
DP		 4807 }
4808
b0067625
ZJS		 4809 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
4810 if (*pid < 0)
4811 return log_error_errno(errno, "clone() failed%s: %m",
4812 errno == EINVAL ?
4813 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4814
4815 if (*pid == 0) {
4816 /* The outer child only has a file system namespace. */
4817 barrier_set_role(&barrier, BARRIER_CHILD);
4818
b0067625
ZJS		 4819 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
4820 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4821 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
4822 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
4823 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
3acc84eb 4824 master_pty_socket_pair[0] = safe_close(master_pty_socket_pair[0]);
b0067625 4825 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
8199d554 4826 unified_cgroup_hierarchy_socket_pair[0] = safe_close(unified_cgroup_hierarchy_socket_pair[0]);
b0067625
ZJS		 4827
4828 (void) reset_all_signal_handlers();
4829 (void) reset_signal_mask();
4830
4831 r = outer_child(&barrier,
4832 arg_directory,
2d845785 4833 dissected_image,
b0067625
ZJS		 4834 secondary,
4835 pid_socket_pair[1],
4836 uuid_socket_pair[1],
4837 notify_socket_pair[1],
4838 kmsg_socket_pair[1],
4839 rtnl_socket_pair[1],
4840 uid_shift_socket_pair[1],
3acc84eb 4841 master_pty_socket_pair[1],
8199d554 4842 unified_cgroup_hierarchy_socket_pair[1],
d7bea6b6 4843 fds,
5b4855ab 4844 child_netns_fd);
b0067625
ZJS		 4845 if (r < 0)
4846 _exit(EXIT_FAILURE);
4847
4848 _exit(EXIT_SUCCESS);
4849 }
4850
4851 barrier_set_role(&barrier, BARRIER_PARENT);
4852
e4077ff6 4853 fdset_close(fds);
b0067625
ZJS		 4854
4855 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
4856 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
4857 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
4858 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
4859 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
3acc84eb 4860 master_pty_socket_pair[1] = safe_close(master_pty_socket_pair[1]);
b0067625 4861 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
8199d554 4862 unified_cgroup_hierarchy_socket_pair[1] = safe_close(unified_cgroup_hierarchy_socket_pair[1]);
b0067625
ZJS		 4863
4864 if (arg_userns_mode != USER_NAMESPACE_NO) {
4865 /* The child just let us know the UID shift it might have read from the image. */
4866 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
4867 if (l < 0)
4868 return log_error_errno(errno, "Failed to read UID shift: %m");
c6147113
LP		 4869 if (l != sizeof arg_uid_shift)
4870 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading UID shift.");
b0067625
ZJS		 4871
4872 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4873 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4874 * image, but if that's already in use, pick a new one, and report back to the child,
4875 * which one we now picked. */
4876
4877 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
4878 if (r < 0)
4879 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
4880
4881 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
4882 if (l < 0)
4883 return log_error_errno(errno, "Failed to send UID shift: %m");
c6147113
LP		 4884 if (l != sizeof arg_uid_shift)
4885 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write while writing UID shift.");
b0067625 4886 }
2f893044
LP		 4887
4888 n_bind_user_uid = strv_length(arg_bind_user);
4889 if (n_bind_user_uid > 0) {
4890 /* Right after the UID shift, we'll receive the list of UID mappings for the
4891 * --bind-user= logic. Always a quadruplet of payload and host UID + GID. */
4892
4893 bind_user_uid = new(uid_t, n_bind_user_uid*4);
4894 if (!bind_user_uid)
4895 return log_oom();
4896
4897 for (size_t i = 0; i < n_bind_user_uid; i++) {
4898 l = recv(uid_shift_socket_pair[0], bind_user_uid + i*4, sizeof(uid_t)*4, 0);
4899 if (l < 0)
4900 return log_error_errno(errno, "Failed to read user UID map pair: %m");
4901 if (l != sizeof(uid_t)*4)
4902 return log_full_errno(l == 0 ? LOG_DEBUG : LOG_WARNING,
4903 SYNTHETIC_ERRNO(EIO),
4904 "Short read while reading bind user UID pairs.");
4905 }
4906 }
b0067625
ZJS		 4907 }
4908
8199d554
LP		 4909 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
4910 /* The child let us know the support cgroup mode it might have read from the image. */
4911 l = recv(unified_cgroup_hierarchy_socket_pair[0], &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), 0);
4912 if (l < 0)
4913 return log_error_errno(errno, "Failed to read cgroup mode: %m");
c6147113
LP		 4914 if (l != sizeof(arg_unified_cgroup_hierarchy))
4915 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading cgroup mode (%zu bytes).%s",
4916 l, l == 0 ? " The child is most likely dead." : "");
8199d554
LP		 4917 }
4918
b0067625 4919 /* Wait for the outer child. */
d2e0ac3d
LP		 4920 r = wait_for_terminate_and_check("(sd-namespace)", *pid, WAIT_LOG_ABNORMAL);
4921 if (r < 0)
4922 return r;
4923 if (r != EXIT_SUCCESS)
4924 return -EIO;
b0067625
ZJS		 4925
4926 /* And now retrieve the PID of the inner child. */
4927 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
4928 if (l < 0)
4929 return log_error_errno(errno, "Failed to read inner child PID: %m");
c6147113
LP		 4930 if (l != sizeof *pid)
4931 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading inner child PID.");
b0067625
ZJS		 4932
4933 /* We also retrieve container UUID in case it was generated by outer child */
4934 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
4935 if (l < 0)
4936 return log_error_errno(errno, "Failed to read container machine ID: %m");
c6147113
LP		 4937 if (l != sizeof(arg_uuid))
4938 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading container machined ID.");
b0067625
ZJS		 4939
4940 /* We also retrieve the socket used for notifications generated by outer child */
4941 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
4942 if (notify_socket < 0)
4943 return log_error_errno(notify_socket,
4944 "Failed to receive notification socket from the outer child: %m");
4945
4946 log_debug("Init process invoked as PID "PID_FMT, *pid);
4947
4948 if (arg_userns_mode != USER_NAMESPACE_NO) {
c6147113
LP		 4949 if (!barrier_place_and_sync(&barrier)) /* #1 */
4950 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
b0067625 4951
2f893044 4952 r = setup_uid_map(*pid, bind_user_uid, n_bind_user_uid);
b0067625
ZJS		 4953 if (r < 0)
4954 return r;
4955
4956 (void) barrier_place(&barrier); /* #2 */
4957 }
4958
4959 if (arg_private_network) {
75116558
PS		 4960 if (!arg_network_namespace_path) {
4961 /* Wait until the child has unshared its network namespace. */
c6147113
LP		 4962 if (!barrier_place_and_sync(&barrier)) /* #3 */
4963 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early");
75116558
PS		 4964 }
4965
5b4855ab
DDM		 4966 if (child_netns_fd < 0) {
4967 /* Make sure we have an open file descriptor to the child's network
4968 * namespace so it stays alive even if the child exits. */
4969 r = namespace_open(*pid, NULL, NULL, &child_netns_fd, NULL, NULL);
4970 if (r < 0)
4971 return log_error_errno(r, "Failed to open child network namespace: %m");
4972 }
4973
4974 r = move_network_interfaces(child_netns_fd, arg_network_interfaces);
b0067625
ZJS		 4975 if (r < 0)
4976 return r;
4977
4978 if (arg_network_veth) {
4979 r = setup_veth(arg_machine, *pid, veth_name,
4980 arg_network_bridge || arg_network_zone);
4981 if (r < 0)
4982 return r;
4983 else if (r > 0)
4984 ifi = r;
4985
4986 if (arg_network_bridge) {
4987 /* Add the interface to a bridge */
4988 r = setup_bridge(veth_name, arg_network_bridge, false);
4989 if (r < 0)
4990 return r;
4991 if (r > 0)
4992 ifi = r;
4993 } else if (arg_network_zone) {
4994 /* Add the interface to a bridge, possibly creating it */
4995 r = setup_bridge(veth_name, arg_network_zone, true);
4996 if (r < 0)
4997 return r;
4998 if (r > 0)
4999 ifi = r;
5000 }
5001 }
5002
5003 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
5004 if (r < 0)
5005 return r;
5006
5007 /* We created the primary and extra veth links now; let's remember this, so that we know to
5008 remove them later on. Note that we don't bother with removing veth links that were created
5009 here when their setup failed half-way, because in that case the kernel should be able to
5010 remove them on its own, since they cannot be referenced by anything yet. */
5011 *veth_created = true;
5012
5013 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
5014 if (r < 0)
5015 return r;
5016
5017 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
5018 if (r < 0)
5019 return r;
5020 }
5021
abdb9b08
LP		 5022 if (arg_register || !arg_keep_unit) {
5023 r = sd_bus_default_system(&bus);
5024 if (r < 0)
5025 return log_error_errno(r, "Failed to open system bus: %m");
e5a2d8b5
LP		 5026
5027 r = sd_bus_set_close_on_exit(bus, false);
5028 if (r < 0)
5029 return log_error_errno(r, "Failed to disable close-on-exit behaviour: %m");
abdb9b08
LP		 5030 }
5031
5032 if (!arg_keep_unit) {
5033 /* When a new scope is created for this container, then we'll be registered as its controller, in which
5034 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
5035 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
5036
75152a4d
LP		 5037 r = sd_bus_match_signal_async(
5038 bus,
5039 NULL,
5040 "org.freedesktop.systemd1",
5041 NULL,
5042 "org.freedesktop.systemd1.Scope",
5043 "RequestStop",
5044 on_request_stop, NULL, PID_TO_PTR(*pid));
abdb9b08 5045 if (r < 0)
75152a4d 5046 return log_error_errno(r, "Failed to request RequestStop match: %m");
abdb9b08
LP		 5047 }
5048
b0067625
ZJS		 5049 if (arg_register) {
5050 r = register_machine(
abdb9b08 5051 bus,
b0067625
ZJS		 5052 arg_machine,
5053 *pid,
5054 arg_directory,
5055 arg_uuid,
5056 ifi,
5057 arg_slice,
5058 arg_custom_mounts, arg_n_custom_mounts,
5059 arg_kill_signal,
5060 arg_property,
de40a303 5061 arg_property_message,
b0067625
ZJS		 5062 arg_keep_unit,
5063 arg_container_service_name);
5064 if (r < 0)
5065 return r;
abdb9b08 5066
cd2dfc6f
LP		 5067 } else if (!arg_keep_unit) {
5068 r = allocate_scope(
abdb9b08 5069 bus,
cd2dfc6f
LP		 5070 arg_machine,
5071 *pid,
5072 arg_slice,
5073 arg_custom_mounts, arg_n_custom_mounts,
5074 arg_kill_signal,
de40a303
LP		 5075 arg_property,
5076 arg_property_message);
cd2dfc6f
LP		 5077 if (r < 0)
5078 return r;
5079
5080 } else if (arg_slice || arg_property)
5081 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
b0067625 5082
27da7ef0 5083 r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy);
b0067625
ZJS		 5084 if (r < 0)
5085 return r;
5086
27da7ef0 5087 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
720f0a2f
LP		 5088 if (r < 0)
5089 return r;
b0067625 5090
de54e02d 5091 r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
b0067625
ZJS		 5092 if (r < 0)
5093 return r;
5094
5095 /* Notify the child that the parent is ready with all
5096 * its setup (including cgroup-ification), and that
5097 * the child can now hand over control to the code to
5098 * run inside the container. */
75116558 5099 (void) barrier_place(&barrier); /* #4 */
b0067625
ZJS		 5100
5101 /* Block SIGCHLD here, before notifying child.
5102 * process_pty() will handle it with the other signals. */
5103 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
5104
5105 /* Reset signal to default */
9c274488 5106 r = default_signals(SIGCHLD);
b0067625
ZJS		 5107 if (r < 0)
5108 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
5109
5110 r = sd_event_new(&event);
5111 if (r < 0)
5112 return log_error_errno(r, "Failed to get default event source: %m");
5113
8fd010bb
LP		 5114 (void) sd_event_set_watchdog(event, true);
5115
abdb9b08
LP		 5116 if (bus) {
5117 r = sd_bus_attach_event(bus, event, 0);
5118 if (r < 0)
5119 return log_error_errno(r, "Failed to attach bus to event loop: %m");
5120 }
5121
e96ceaba 5122 r = setup_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
b0067625
ZJS		 5123 if (r < 0)
5124 return r;
5125
5126 /* Let the child know that we are ready and wait that the child is completely ready now. */
c6147113
LP		 5127 if (!barrier_place_and_sync(&barrier)) /* #5 */
5128 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
b0067625 5129
38ccb557 5130 /* At this point we have made use of the UID we picked, and thus nss-systemd/systemd-machined.service
b0067625
ZJS		 5131 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
5132 etc_passwd_lock = safe_close(etc_passwd_lock);
5133
04f590a4
LP		 5134 (void) sd_notifyf(false,
5135 "STATUS=Container running.\n"
5136 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
b0067625 5137 if (!arg_notify_ready)
919f5ae0 5138 (void) sd_notify(false, "READY=1\n");
b0067625
ZJS		 5139
5140 if (arg_kill_signal > 0) {
5141 /* Try to kill the init system on SIGINT or SIGTERM */
919f5ae0
LP		 5142 (void) sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
5143 (void) sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
b0067625
ZJS		 5144 } else {
5145 /* Immediately exit */
919f5ae0
LP		 5146 (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
5147 (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
b0067625
ZJS		 5148 }
5149
6916b164 5150 /* Exit when the child exits */
919f5ae0 5151 (void) sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
b0067625
ZJS		 5152
5153 if (arg_expose_ports) {
761cf19d 5154 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, expose_args, &rtnl);
b0067625
ZJS		 5155 if (r < 0)
5156 return r;
5157
deff68e7
FW		 5158 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5159 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
b0067625
ZJS		 5160 }
5161
5162 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
5163
3acc84eb
FB		 5164 if (arg_console_mode != CONSOLE_PIPE) {
5165 _cleanup_close_ int fd = -1;
5166 PTYForwardFlags flags = 0;
de40a303 5167
3acc84eb
FB		 5168 /* Retrieve the master pty allocated by inner child */
5169 fd = receive_one_fd(master_pty_socket_pair[0], 0);
5170 if (fd < 0)
5171 return log_error_errno(fd, "Failed to receive master pty from the inner child: %m");
5172
5173 switch (arg_console_mode) {
de40a303 5174
3acc84eb
FB		 5175 case CONSOLE_READ_ONLY:
5176 flags |= PTY_FORWARD_READ_ONLY;
5177
5178 _fallthrough_;
5179
5180 case CONSOLE_INTERACTIVE:
5181 flags |= PTY_FORWARD_IGNORE_VHANGUP;
5182
5183 r = pty_forward_new(event, fd, flags, &forward);
5184 if (r < 0)
5185 return log_error_errno(r, "Failed to create PTY forwarder: %m");
5186
f5fbe71d 5187 if (arg_console_width != UINT_MAX || arg_console_height != UINT_MAX)
3acc84eb
FB		 5188 (void) pty_forward_set_width_height(forward,
5189 arg_console_width,
5190 arg_console_height);
5191 break;
5192
5193 default:
5194 assert(arg_console_mode == CONSOLE_PASSIVE);
5195 }
5196
5197 *master = TAKE_FD(fd);
de40a303 5198 }
b0067625
ZJS		 5199
5200 r = sd_event_loop(event);
5201 if (r < 0)
5202 return log_error_errno(r, "Failed to run event loop: %m");
5203
de40a303
LP		 5204 if (forward) {
5205 char last_char = 0;
b0067625 5206
de40a303
LP		 5207 (void) pty_forward_get_last_char(forward, &last_char);
5208 forward = pty_forward_free(forward);
b0067625 5209
de40a303
LP		 5210 if (!arg_quiet && last_char != '\n')
5211 putc('\n', stdout);
5212 }
b0067625
ZJS		 5213
5214 /* Kill if it is not dead yet anyway */
0bb0a9fa
ZJS		 5215 if (!arg_register && !arg_keep_unit && bus)
5216 terminate_scope(bus, arg_machine);
b0067625
ZJS		 5217
5218 /* Normally redundant, but better safe than sorry */
c67b0082 5219 (void) kill(*pid, SIGKILL);
b0067625 5220
5b4855ab
DDM		 5221 if (arg_private_network) {
5222 /* Move network interfaces back to the parent network namespace. We use `safe_fork`
5223 * to avoid having to move the parent to the child network namespace. */
5224 r = safe_fork(NULL, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
5225 if (r < 0)
5226 return r;
5227
5228 if (r == 0) {
5229 _cleanup_close_ int parent_netns_fd = -1;
5230
5231 r = namespace_open(getpid(), NULL, NULL, &parent_netns_fd, NULL, NULL);
5232 if (r < 0) {
5233 log_error_errno(r, "Failed to open parent network namespace: %m");
5234 _exit(EXIT_FAILURE);
5235 }
5236
5237 r = namespace_enter(-1, -1, child_netns_fd, -1, -1);
5238 if (r < 0) {
5239 log_error_errno(r, "Failed to enter child network namespace: %m");
5240 _exit(EXIT_FAILURE);
5241 }
5242
5243 r = move_network_interfaces(parent_netns_fd, arg_network_interfaces);
5244 if (r < 0)
5245 log_error_errno(r, "Failed to move network interfaces back to parent network namespace: %m");
5246
5247 _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
5248 }
5249 }
5250
b0067625
ZJS		 5251 r = wait_for_container(*pid, &container_status);
5252 *pid = 0;
5253
0bb0a9fa
ZJS		 5254 /* Tell machined that we are gone. */
5255 if (bus)
5256 (void) unregister_machine(bus, arg_machine);
5257
b0067625
ZJS		 5258 if (r < 0)
5259 /* We failed to wait for the container, or the container exited abnormally. */
5260 return r;
5261 if (r > 0 || container_status == CONTAINER_TERMINATED) {
27e29a1e
ZJS		 5262 /* r > 0 → The container exited with a non-zero status.
5263 * As a special case, we need to replace 133 with a different value,
5264 * because 133 is special-cased in the service file to reboot the container.
5265 * otherwise → The container exited with zero status and a reboot was not requested.
5266 */
2a49b612 5267 if (r == EXIT_FORCE_RESTART)
27e29a1e 5268 r = EXIT_FAILURE; /* replace 133 with the general failure code */
b0067625 5269 *ret = r;
b0067625
ZJS		 5270 return 0; /* finito */
5271 }
5272
5273 /* CONTAINER_REBOOTED, loop again */
5274
5275 if (arg_keep_unit) {
5276 /* Special handling if we are running as a service: instead of simply
5277 * restarting the machine we want to restart the entire service, so let's
5278 * inform systemd about this with the special exit code 133. The service
5279 * file uses RestartForceExitStatus=133 so that this results in a full
5280 * nspawn restart. This is necessary since we might have cgroup parameters
5281 * set we want to have flushed out. */
2a49b612
ZJS		 5282 *ret = EXIT_FORCE_RESTART;
5283 return 0; /* finito */
b0067625
ZJS		 5284 }
5285
deff68e7
FW		 5286 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5287 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
b0067625
ZJS		 5288
5289 (void) remove_veth_links(veth_name, arg_network_veth_extra);
5290 *veth_created = false;
5291 return 1; /* loop again */
5292}
5293
bf428efb 5294static int initialize_rlimits(void) {
bf428efb
LP		 5295 /* The default resource limits the kernel passes to PID 1, as per kernel 4.16. Let's pass our container payload
5296 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
5297 * container execution environments. */
5298
5299 static const struct rlimit kernel_defaults[_RLIMIT_MAX] = {
5300 [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY },
5301 [RLIMIT_CORE] = { 0, RLIM_INFINITY },
5302 [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY },
5303 [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY },
5304 [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY },
5305 [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY },
5306 [RLIMIT_MEMLOCK] = { 65536, 65536 },
5307 [RLIMIT_MSGQUEUE] = { 819200, 819200 },
5308 [RLIMIT_NICE] = { 0, 0 },
5309 [RLIMIT_NOFILE] = { 1024, 4096 },
5310 [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY },
5311 [RLIMIT_RTPRIO] = { 0, 0 },
5312 [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY },
5313 [RLIMIT_STACK] = { 8388608, RLIM_INFINITY },
5314
5315 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
5316 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
5317 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
5318 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
5319 * that PID 1 changes a number of other resource limits during early initialization which is why we
5320 * don't read the other limits from PID 1 but prefer the static table above. */
5321 };
5322
5323 int rl;
5324
5325 for (rl = 0; rl < _RLIMIT_MAX; rl++) {
bf428efb
LP		 5326 /* Let's only fill in what the user hasn't explicitly configured anyway */
5327 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)) == 0) {
5328 const struct rlimit *v;
5329 struct rlimit buffer;
5330
5331 if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) {
5332 /* For these two let's read the limits off PID 1. See above for an explanation. */
5333
5334 if (prlimit(1, rl, NULL, &buffer) < 0)
5335 return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
5336
dbf1aca6
LP		 5337 v = &buffer;
5338 } else if (rl == RLIMIT_NOFILE) {
5339 /* We nowadays bump RLIMIT_NOFILE's hard limit early in PID 1 for all
5340 * userspace. Given that nspawn containers are often run without our PID 1,
5341 * let's grant the containers a raised RLIMIT_NOFILE hard limit by default,
5342 * so that container userspace gets similar resources as host userspace
5343 * gets. */
5344 buffer = kernel_defaults[rl];
5345 buffer.rlim_max = MIN((rlim_t) read_nr_open(), (rlim_t) HIGH_RLIMIT_NOFILE);
bf428efb
LP		 5346 v = &buffer;
5347 } else
5348 v = kernel_defaults + rl;
5349
5350 arg_rlimit[rl] = newdup(struct rlimit, v, 1);
5351 if (!arg_rlimit[rl])
5352 return log_oom();
5353 }
5354
5355 if (DEBUG_LOGGING) {
5356 _cleanup_free_ char *k = NULL;
5357
5358 (void) rlimit_format(arg_rlimit[rl], &k);
5359 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl), k);
5360 }
5361 }
5362
5363 return 0;
5364}
5365
287b7376
LP		 5366static int cant_be_in_netns(void) {
5367 union sockaddr_union sa = {
5368 .un = {
5369 .sun_family = AF_UNIX,
5370 .sun_path = "/run/udev/control",
5371 },
5372 };
5373 char udev_path[STRLEN("/proc//ns/net") + DECIMAL_STR_MAX(pid_t)];
5374 _cleanup_free_ char *udev_ns = NULL, *our_ns = NULL;
5375 _cleanup_close_ int fd = -1;
5376 struct ucred ucred;
5377 int r;
5378
5379 /* Check if we are in the same netns as udev. If we aren't, then device monitoring (and thus waiting
5380 * for loopback block devices) won't work, and we will hang. Detect this case and exit early with a
5381 * nice message. */
5382
5383 if (!arg_image) /* only matters if --image= us used, i.e. we actually need to use loopback devices */
5384 return 0;
5385
5386 fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
5387 if (fd < 0)
5388 return log_error_errno(errno, "Failed to allocate udev control socket: %m");
5389
32b9736a 5390 if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
287b7376
LP		 5391
5392 if (errno == ENOENT || ERRNO_IS_DISCONNECT(errno))
5393 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5394 "Sorry, but --image= requires access to the host's /run/ hierarchy, since we need access to udev.");
5395
5396 return log_error_errno(errno, "Failed to connect socket to udev control socket: %m");
5397 }
5398
5399 r = getpeercred(fd, &ucred);
5400 if (r < 0)
5401 return log_error_errno(r, "Failed to determine peer of udev control socket: %m");
5402
5403 xsprintf(udev_path, "/proc/" PID_FMT "/ns/net", ucred.pid);
5404 r = readlink_malloc(udev_path, &udev_ns);
5405 if (r < 0)
5406 return log_error_errno(r, "Failed to read network namespace of udev: %m");
5407
5408 r = readlink_malloc("/proc/self/ns/net", &our_ns);
5409 if (r < 0)
5410 return log_error_errno(r, "Failed to read our own network namespace: %m");
5411
5412 if (!streq(our_ns, udev_ns))
5413 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5414 "Sorry, but --image= is only supported in the main network namespace, since we need access to udev/AF_NETLINK.");
5415 return 0;
5416}
5417
44dbef90 5418static int run(int argc, char *argv[]) {
7bf011e3
LP		 5419 bool secondary = false, remove_directory = false, remove_image = false,
5420 veth_created = false, remove_tmprootdir = false;
2d845785 5421 _cleanup_close_ int master = -1;
03cfe0d5 5422 _cleanup_fdset_free_ FDSet *fds = NULL;
2d845785 5423 int r, n_fd_passed, ret = EXIT_SUCCESS;
5aa3eba5 5424 char veth_name[IFNAMSIZ] = "";
761cf19d 5425 struct ExposeArgs expose_args = {};
8e766630 5426 _cleanup_(release_lock_file) LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
c67b0082 5427 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
2d845785 5428 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
18b5886e
LP		 5429 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
5430 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
761cf19d 5431 _cleanup_(fw_ctx_freep) FirewallContext *fw_ctx = NULL;
7bf011e3 5432 pid_t pid = 0;
03cfe0d5
LP		 5433
5434 log_parse_environment();
5435 log_open();
415fc41c 5436
03cfe0d5
LP		 5437 r = parse_argv(argc, argv);
5438 if (r <= 0)
5439 goto finish;
5440
38ee19c0
ZJS		 5441 if (geteuid() != 0) {
5442 r = log_warning_errno(SYNTHETIC_ERRNO(EPERM),
5443 argc >= 2 ? "Need to be root." :
5444 "Need to be root (and some arguments are usually required).\nHint: try --help");
03cfe0d5 5445 goto finish;
38ee19c0 5446 }
fba868fa 5447
287b7376
LP		 5448 r = cant_be_in_netns();
5449 if (r < 0)
5450 goto finish;
5451
bf428efb
LP		 5452 r = initialize_rlimits();
5453 if (r < 0)
5454 goto finish;
5455
de40a303
LP		 5456 r = load_oci_bundle();
5457 if (r < 0)
5458 goto finish;
5459
f757855e
LP		 5460 r = determine_names();
5461 if (r < 0)
5462 goto finish;
5463
5464 r = load_settings();
5465 if (r < 0)
5466 goto finish;
5467
d4d99bc6 5468 r = cg_unified();
5eee8290
LP		 5469 if (r < 0) {
5470 log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
5471 goto finish;
5472 }
5473
f757855e
LP		 5474 r = verify_arguments();
5475 if (r < 0)
5476 goto finish;
03cfe0d5 5477
49048684
ZJS		 5478 /* Reapply environment settings. */
5479 (void) detect_unified_cgroup_hierarchy_from_environment();
8199d554 5480
2949ff26
LP		 5481 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
5482 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
5483 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
9c274488 5484 (void) ignore_signals(SIGPIPE);
2949ff26 5485
03cfe0d5
LP		 5486 n_fd_passed = sd_listen_fds(false);
5487 if (n_fd_passed > 0) {
5488 r = fdset_new_listen_fds(&fds, false);
5489 if (r < 0) {
5490 log_error_errno(r, "Failed to collect file descriptors: %m");
5491 goto finish;
5492 }
5493 }
5494
83e803a9
ZJS		 5495 /* The "default" umask. This is appropriate for most file and directory
5496 * operations performed by nspawn, and is the umask that will be used for
5497 * the child. Functions like copy_devnodes() change the umask temporarily. */
5498 umask(0022);
5499
03cfe0d5
LP		 5500 if (arg_directory) {
5501 assert(!arg_image);
5502
b35ca61a
LP		 5503 /* Safety precaution: let's not allow running images from the live host OS image, as long as
5504 * /var from the host will propagate into container dynamically (because bad things happen if
5505 * two systems write to the same /var). Let's allow it for the special cases where /var is
5506 * either copied (i.e. --ephemeral) or replaced (i.e. --volatile=yes|state). */
5507 if (path_equal(arg_directory, "/") && !(arg_ephemeral || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_STATE))) {
5508 log_error("Spawning container on root directory is not supported. Consider using --ephemeral, --volatile=yes or --volatile=state.");
03cfe0d5
LP		 5509 r = -EINVAL;
5510 goto finish;
5511 }
5512
5513 if (arg_ephemeral) {
5514 _cleanup_free_ char *np = NULL;
5515
8d4aa2bb 5516 r = chase_symlinks_and_update(&arg_directory, 0);
3f342ec4
LP		 5517 if (r < 0)
5518 goto finish;
5519
7bf011e3
LP		 5520 /* If the specified path is a mount point we generate the new snapshot immediately
5521 * inside it under a random name. However if the specified is not a mount point we
5522 * create the new snapshot in the parent directory, just next to it. */
e1873695 5523 r = path_is_mount_point(arg_directory, NULL, 0);
03cfe0d5
LP		 5524 if (r < 0) {
5525 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
5526 goto finish;
5527 }
5528 if (r > 0)
770b5ce4 5529 r = tempfn_random_child(arg_directory, "machine.", &np);
03cfe0d5 5530 else
770b5ce4 5531 r = tempfn_random(arg_directory, "machine.", &np);
03cfe0d5 5532 if (r < 0) {
0f3be6ca 5533 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
03cfe0d5
LP		 5534 goto finish;
5535 }
5536
6992459c 5537 /* We take an exclusive lock on this image, since it's our private, ephemeral copy
162392b7 5538 * only owned by us and no one else. */
6992459c 5539 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
03cfe0d5
LP		 5540 if (r < 0) {
5541 log_error_errno(r, "Failed to lock %s: %m", np);
5542 goto finish;
5543 }
5544
7bf011e3
LP		 5545 {
5546 BLOCK_SIGNALS(SIGINT);
5547 r = btrfs_subvol_snapshot(arg_directory, np,
5548 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5549 BTRFS_SNAPSHOT_FALLBACK_COPY |
5550 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5551 BTRFS_SNAPSHOT_RECURSIVE |
5552 BTRFS_SNAPSHOT_QUOTA |
5553 BTRFS_SNAPSHOT_SIGINT);
5554 }
5555 if (r == -EINTR) {
5556 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", np);
5557 goto finish;
5558 }
03cfe0d5
LP		 5559 if (r < 0) {
5560 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
5561 goto finish;
ec16945e
LP		 5562 }
5563
1cc6c93a 5564 free_and_replace(arg_directory, np);
17cbb288 5565 remove_directory = true;
30535c16 5566 } else {
cb638b5e 5567 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
8d4aa2bb
LP		 5568 if (r < 0)
5569 goto finish;
5570
30535c16
LP		 5571 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5572 if (r == -EBUSY) {
5573 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
5574 goto finish;
5575 }
5576 if (r < 0) {
5577 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
476b8254 5578 goto finish;
30535c16
LP		 5579 }
5580
5581 if (arg_template) {
8d4aa2bb 5582 r = chase_symlinks_and_update(&arg_template, 0);
3f342ec4
LP		 5583 if (r < 0)
5584 goto finish;
5585
7bf011e3
LP		 5586 {
5587 BLOCK_SIGNALS(SIGINT);
5588 r = btrfs_subvol_snapshot(arg_template, arg_directory,
5589 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5590 BTRFS_SNAPSHOT_FALLBACK_COPY |
5591 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5592 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
5593 BTRFS_SNAPSHOT_RECURSIVE |
5594 BTRFS_SNAPSHOT_QUOTA |
5595 BTRFS_SNAPSHOT_SIGINT);
5596 }
ff6c6cc1
LP		 5597 if (r == -EEXIST)
5598 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5599 "Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
7bf011e3
LP		 5600 else if (r == -EINTR) {
5601 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", arg_directory);
5602 goto finish;
5603 } else if (r < 0) {
83521414 5604 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
30535c16 5605 goto finish;
ff6c6cc1
LP		 5606 } else
5607 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5608 "Populated %s from template %s.", arg_directory, arg_template);
30535c16 5609 }
ec16945e
LP		 5610 }
5611
7732f92b 5612 if (arg_start_mode == START_BOOT) {
a5201ed6 5613 const char *p;
c9fe05e0 5614
a5201ed6
LP		 5615 if (arg_pivot_root_new)
5616 p = prefix_roota(arg_directory, arg_pivot_root_new);
5617 else
5618 p = arg_directory;
c9fe05e0
AR		 5619
5620 if (path_is_os_tree(p) <= 0) {
5621 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p);
ec16945e 5622 r = -EINVAL;
1b9e5b12
LP		 5623 goto finish;
5624 }
5625 } else {
c9fe05e0
AR		 5626 const char *p, *q;
5627
a5201ed6
LP		 5628 if (arg_pivot_root_new)
5629 p = prefix_roota(arg_directory, arg_pivot_root_new);
5630 else
5631 p = arg_directory;
c9fe05e0
AR		 5632
5633 q = strjoina(p, "/usr/");
1b9e5b12 5634
c9fe05e0
AR		 5635 if (laccess(q, F_OK) < 0) {
5636 log_error("Directory %s doesn't look like it has an OS tree. Refusing.", p);
ec16945e 5637 r = -EINVAL;
1b9e5b12 5638 goto finish;
1b9e5b12
LP		 5639 }
5640 }
ec16945e 5641
6b9132a9 5642 } else {
d04faa4e 5643 DissectImageFlags dissect_image_flags =
4b5de5dd 5644 DISSECT_IMAGE_GENERIC_ROOT |
d04faa4e
LP		 5645 DISSECT_IMAGE_REQUIRE_ROOT |
5646 DISSECT_IMAGE_RELAX_VAR_CHECK |
5647 DISSECT_IMAGE_USR_NO_ROOT;
ec16945e
LP		 5648 assert(arg_image);
5649 assert(!arg_template);
5650
8d4aa2bb 5651 r = chase_symlinks_and_update(&arg_image, 0);
3f342ec4
LP		 5652 if (r < 0)
5653 goto finish;
5654
0f3be6ca
LP		 5655 if (arg_ephemeral) {
5656 _cleanup_free_ char *np = NULL;
5657
5658 r = tempfn_random(arg_image, "machine.", &np);
5659 if (r < 0) {
5660 log_error_errno(r, "Failed to generate name for image snapshot: %m");
5661 goto finish;
5662 }
5663
6992459c
LP		 5664 /* Always take an exclusive lock on our own ephemeral copy. */
5665 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
0f3be6ca
LP		 5666 if (r < 0) {
5667 r = log_error_errno(r, "Failed to create image lock: %m");
5668 goto finish;
5669 }
5670
7bf011e3
LP		 5671 {
5672 BLOCK_SIGNALS(SIGINT);
5673 r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME|COPY_SIGINT);
5674 }
5675 if (r == -EINTR) {
5676 log_error_errno(r, "Interrupted while copying image file to %s, removed again.", np);
5677 goto finish;
5678 }
0f3be6ca
LP		 5679 if (r < 0) {
5680 r = log_error_errno(r, "Failed to copy image file: %m");
5681 goto finish;
5682 }
5683
1cc6c93a 5684 free_and_replace(arg_image, np);
0f3be6ca
LP		 5685 remove_image = true;
5686 } else {
5687 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5688 if (r == -EBUSY) {
5689 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
5690 goto finish;
5691 }
5692 if (r < 0) {
5693 r = log_error_errno(r, "Failed to create image lock: %m");
5694 goto finish;
5695 }
4623e8e6 5696
89e62e0b
LP		 5697 r = verity_settings_load(
5698 &arg_verity_settings,
5699 arg_image, NULL, NULL);
e7cbe5cb
LB		 5700 if (r < 0) {
5701 log_error_errno(r, "Failed to read verity artefacts for %s: %m", arg_image);
5702 goto finish;
78ebe980 5703 }
89e62e0b
LP		 5704
5705 if (arg_verity_settings.data_path)
5706 dissect_image_flags |= DISSECT_IMAGE_NO_PARTITION_TABLE;
30535c16
LP		 5707 }
5708
c67b0082 5709 if (!mkdtemp(tmprootdir)) {
0f3be6ca 5710 r = log_error_errno(errno, "Failed to create temporary directory: %m");
6b9132a9 5711 goto finish;
1b9e5b12 5712 }
6b9132a9 5713
c67b0082
LP		 5714 remove_tmprootdir = true;
5715
5716 arg_directory = strdup(tmprootdir);
1b9e5b12
LP		 5717 if (!arg_directory) {
5718 r = log_oom();
5719 goto finish;
6b9132a9 5720 }
88213476 5721
89e62e0b
LP		 5722 r = loop_device_make_by_path(
5723 arg_image,
5724 arg_read_only ? O_RDONLY : O_RDWR,
5725 FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
5726 &loop);
2d845785
LP		 5727 if (r < 0) {
5728 log_error_errno(r, "Failed to set up loopback block device: %m");
842f3b0f
LP		 5729 goto finish;
5730 }
1b9e5b12 5731
4526113f 5732 r = dissect_image_and_warn(
e0f9e7bd 5733 loop->fd,
4526113f 5734 arg_image,
89e62e0b 5735 &arg_verity_settings,
18d73705 5736 NULL,
a3642997 5737 loop->diskseq,
75dc190d 5738 loop->uevent_seqnum_not_before,
4a62257d 5739 loop->timestamp_not_before,
e7cbe5cb 5740 dissect_image_flags,
e0f9e7bd 5741 &dissected_image);
2d845785 5742 if (r == -ENOPKG) {
4526113f 5743 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
2d845785
LP		 5744 log_notice("Note that the disk image needs to\n"
5745 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
5746 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
19ac32cd 5747 " c) or follow https://systemd.io/DISCOVERABLE_PARTITIONS\n"
2d845785
LP		 5748 " d) or contain a file system without a partition table\n"
5749 "in order to be bootable with systemd-nspawn.");
1b9e5b12 5750 goto finish;
2d845785 5751 }
4526113f 5752 if (r < 0)
842f3b0f 5753 goto finish;
1b9e5b12 5754
88b3300f
LP		 5755 r = dissected_image_load_verity_sig_partition(
5756 dissected_image,
5757 loop->fd,
5758 &arg_verity_settings);
5759 if (r < 0)
5760 goto finish;
5761
8ee9615e
LP		 5762 if (dissected_image->has_verity && !arg_verity_settings.root_hash && !dissected_image->has_verity_sig)
5763 log_notice("Note: image %s contains verity information, but no root hash specified and no embedded "
5764 "root hash signature found! Proceeding without integrity checking.", arg_image);
4623e8e6 5765
89e62e0b
LP		 5766 r = dissected_image_decrypt_interactively(
5767 dissected_image,
5768 NULL,
5769 &arg_verity_settings,
5770 0,
5771 &decrypted_image);
1b9e5b12
LP		 5772 if (r < 0)
5773 goto finish;
0f3be6ca
LP		 5774
5775 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
5776 if (remove_image && unlink(arg_image) >= 0)
5777 remove_image = false;
842f3b0f 5778 }
842f3b0f 5779
86c0dd4a 5780 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
5a8af538
LP		 5781 if (r < 0)
5782 goto finish;
5783
de40a303
LP		 5784 if (arg_console_mode < 0)
5785 arg_console_mode =
5786 isatty(STDIN_FILENO) > 0 &&
5787 isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
9c857b9d 5788
de40a303
LP		 5789 if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
5790 arg_quiet = true;
a258bf26 5791
9c857b9d
LP		 5792 if (!arg_quiet)
5793 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
5794 arg_machine, arg_image ?: arg_directory);
5795
72c0a2c2 5796 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
a258bf26 5797
66edd963 5798 if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) < 0) {
03cfe0d5
LP		 5799 r = log_error_errno(errno, "Failed to become subreaper: %m");
5800 goto finish;
5801 }
5802
761cf19d
FW		 5803 if (arg_expose_ports) {
5804 r = fw_ctx_new(&fw_ctx);
5805 if (r < 0) {
5806 log_error_errno(r, "Cannot expose configured ports, firewall initialization failed: %m");
5807 goto finish;
5808 }
5809 expose_args.fw_ctx = fw_ctx;
5810 }
d87be9b0 5811 for (;;) {
3acc84eb 5812 r = run_container(dissected_image,
44dbef90
LP		 5813 secondary,
5814 fds,
5815 veth_name, &veth_created,
761cf19d 5816 &expose_args, &master,
44dbef90 5817 &pid, &ret);
b0067625 5818 if (r <= 0)
d87be9b0 5819 break;
d87be9b0 5820 }
88213476
LP		 5821
5822finish:
04f590a4
LP		 5823 (void) sd_notify(false,
5824 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
5825 "STOPPING=1\nSTATUS=Terminating...");
af4ec430 5826
9444b1f2 5827 if (pid > 0)
c67b0082 5828 (void) kill(pid, SIGKILL);
88213476 5829
503546da 5830 /* Try to flush whatever is still queued in the pty */
6a0f896b 5831 if (master >= 0) {
f5fbe71d 5832 (void) copy_bytes(master, STDOUT_FILENO, UINT64_MAX, 0);
6a0f896b
LP		 5833 master = safe_close(master);
5834 }
5835
5836 if (pid > 0)
5837 (void) wait_for_terminate(pid, NULL);
503546da 5838
50ebcf6c
LP		 5839 pager_close();
5840
17cbb288 5841 if (remove_directory && arg_directory) {
ec16945e
LP		 5842 int k;
5843
17cbb288 5844 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
ec16945e 5845 if (k < 0)
17cbb288 5846 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
ec16945e
LP		 5847 }
5848
0f3be6ca
LP		 5849 if (remove_image && arg_image) {
5850 if (unlink(arg_image) < 0)
5851 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
5852 }
5853
c67b0082
LP		 5854 if (remove_tmprootdir) {
5855 if (rmdir(tmprootdir) < 0)
5856 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
5857 }
5858
785890ac
LP		 5859 if (arg_machine) {
5860 const char *p;
5861
63c372cb 5862 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
c6878637 5863 (void) rm_rf(p, REMOVE_ROOT);
785890ac
LP		 5864 }
5865
deff68e7
FW		 5866 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET, &expose_args.address4);
5867 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET6, &expose_args.address6);
7513c5b8
LP		 5868
5869 if (veth_created)
5870 (void) remove_veth_links(veth_name, arg_network_veth_extra);
22b28dfd 5871 (void) remove_bridge(arg_network_zone);
f757855e 5872
f757855e
LP		 5873 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
5874 expose_port_free_all(arg_expose_ports);
bf428efb 5875 rlimit_free_all(arg_rlimit);
b2645747 5876 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
3652872a 5877 credential_free_all(arg_credentials, arg_n_credentials);
6d0b55c2 5878
44dbef90
LP		 5879 if (r < 0)
5880 return r;
5881
5882 return ret;
88213476 5883}
44dbef90
LP		 5884
5885DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.