]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/nspawn/nspawn.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge pull request #25096 from DaanDeMeyer/journald-log-fixes
[thirdparty/systemd.git] / src / nspawn / nspawn.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #if HAVE_BLKID
4 #endif
5 #include <errno.h>
6 #include <getopt.h>
7 #include <linux/fs.h>
8 #include <linux/loop.h>
9 #if HAVE_SELINUX
10 #include <selinux/selinux.h>
11 #endif
12 #include <stdlib.h>
13 #include <sys/file.h>
14 #include <sys/ioctl.h>
15 #include <sys/personality.h>
16 #include <sys/prctl.h>
17 #include <sys/types.h>
18 #include <sys/wait.h>
19 #include <termios.h>
20 #include <unistd.h>
21
22 #include "sd-bus.h"
23 #include "sd-daemon.h"
24 #include "sd-id128.h"
25
26 #include "alloc-util.h"
27 #include "barrier.h"
28 #include "base-filesystem.h"
29 #include "blkid-util.h"
30 #include "btrfs-util.h"
31 #include "build.h"
32 #include "bus-error.h"
33 #include "bus-util.h"
34 #include "cap-list.h"
35 #include "capability-util.h"
36 #include "cgroup-util.h"
37 #include "chase-symlinks.h"
38 #include "copy.h"
39 #include "cpu-set-util.h"
40 #include "creds-util.h"
41 #include "dev-setup.h"
42 #include "discover-image.h"
43 #include "dissect-image.h"
44 #include "env-util.h"
45 #include "escape.h"
46 #include "fd-util.h"
47 #include "fdset.h"
48 #include "fileio.h"
49 #include "format-util.h"
50 #include "fs-util.h"
51 #include "gpt.h"
52 #include "hexdecoct.h"
53 #include "hostname-setup.h"
54 #include "hostname-util.h"
55 #include "id128-util.h"
56 #include "io-util.h"
57 #include "log.h"
58 #include "loop-util.h"
59 #include "loopback-setup.h"
60 #include "macro.h"
61 #include "main-func.h"
62 #include "missing_sched.h"
63 #include "mkdir.h"
64 #include "mount-util.h"
65 #include "mountpoint-util.h"
66 #include "namespace-util.h"
67 #include "netlink-util.h"
68 #include "nspawn-bind-user.h"
69 #include "nspawn-cgroup.h"
70 #include "nspawn-creds.h"
71 #include "nspawn-def.h"
72 #include "nspawn-expose-ports.h"
73 #include "nspawn-mount.h"
74 #include "nspawn-network.h"
75 #include "nspawn-oci.h"
76 #include "nspawn-patch-uid.h"
77 #include "nspawn-register.h"
78 #include "nspawn-seccomp.h"
79 #include "nspawn-settings.h"
80 #include "nspawn-setuid.h"
81 #include "nspawn-stub-pid1.h"
82 #include "nspawn-util.h"
83 #include "nspawn.h"
84 #include "nulstr-util.h"
85 #include "os-util.h"
86 #include "pager.h"
87 #include "parse-argument.h"
88 #include "parse-util.h"
89 #include "pretty-print.h"
90 #include "process-util.h"
91 #include "ptyfwd.h"
92 #include "random-util.h"
93 #include "raw-clone.h"
94 #include "resolve-util.h"
95 #include "rlimit-util.h"
96 #include "rm-rf.h"
97 #if HAVE_SECCOMP
98 #include "seccomp-util.h"
99 #endif
100 #include "selinux-util.h"
101 #include "signal-util.h"
102 #include "socket-util.h"
103 #include "stat-util.h"
104 #include "stdio-util.h"
105 #include "string-table.h"
106 #include "string-util.h"
107 #include "strv.h"
108 #include "sysctl-util.h"
109 #include "terminal-util.h"
110 #include "tmpfile-util.h"
111 #include "umask-util.h"
112 #include "unit-name.h"
113 #include "user-util.h"
114
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"
117
118 #define EXIT_FORCE_RESTART 133
119
120 typedef enum ContainerStatus {
121 CONTAINER_TERMINATED,
122 CONTAINER_REBOOTED,
123 } ContainerStatus;
124
125 static char *arg_directory = NULL;
126 static char *arg_template = NULL;
127 static char *arg_chdir = NULL;
128 static char *arg_pivot_root_new = NULL;
129 static char *arg_pivot_root_old = NULL;
130 static char *arg_user = NULL;
131 static uid_t arg_uid = UID_INVALID;
132 static gid_t arg_gid = GID_INVALID;
133 static gid_t* arg_supplementary_gids = NULL;
134 static size_t arg_n_supplementary_gids = 0;
135 static sd_id128_t arg_uuid = {};
136 static char *arg_machine = NULL; /* The name used by the host to refer to this */
137 static char *arg_hostname = NULL; /* The name the payload sees by default */
138 static const char *arg_selinux_context = NULL;
139 static const char *arg_selinux_apifs_context = NULL;
140 static char *arg_slice = NULL;
141 static bool arg_private_network = false;
142 static bool arg_read_only = false;
143 static StartMode arg_start_mode = START_PID1;
144 static bool arg_ephemeral = false;
145 static LinkJournal arg_link_journal = LINK_AUTO;
146 static bool arg_link_journal_try = false;
147 static uint64_t arg_caps_retain =
148 (1ULL << CAP_AUDIT_CONTROL) |
149 (1ULL << CAP_AUDIT_WRITE) |
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) |
159 (1ULL << CAP_MKNOD) |
160 (1ULL << CAP_NET_BIND_SERVICE) |
161 (1ULL << CAP_NET_BROADCAST) |
162 (1ULL << CAP_NET_RAW) |
163 (1ULL << CAP_SETFCAP) |
164 (1ULL << CAP_SETGID) |
165 (1ULL << CAP_SETPCAP) |
166 (1ULL << CAP_SETUID) |
167 (1ULL << CAP_SYS_ADMIN) |
168 (1ULL << CAP_SYS_BOOT) |
169 (1ULL << CAP_SYS_CHROOT) |
170 (1ULL << CAP_SYS_NICE) |
171 (1ULL << CAP_SYS_PTRACE) |
172 (1ULL << CAP_SYS_RESOURCE) |
173 (1ULL << CAP_SYS_TTY_CONFIG);
174 static uint64_t arg_caps_ambient = 0;
175 static CapabilityQuintet arg_full_capabilities = CAPABILITY_QUINTET_NULL;
176 static CustomMount *arg_custom_mounts = NULL;
177 static size_t arg_n_custom_mounts = 0;
178 static char **arg_setenv = NULL;
179 static bool arg_quiet = false;
180 static bool arg_register = true;
181 static bool arg_keep_unit = false;
182 static char **arg_network_interfaces = NULL;
183 static char **arg_network_macvlan = NULL;
184 static char **arg_network_ipvlan = NULL;
185 static bool arg_network_veth = false;
186 static char **arg_network_veth_extra = NULL;
187 static char *arg_network_bridge = NULL;
188 static char *arg_network_zone = NULL;
189 static char *arg_network_namespace_path = NULL;
190 static PagerFlags arg_pager_flags = 0;
191 static unsigned long arg_personality = PERSONALITY_INVALID;
192 static char *arg_image = NULL;
193 static char *arg_oci_bundle = NULL;
194 static VolatileMode arg_volatile_mode = VOLATILE_NO;
195 static ExposePort *arg_expose_ports = NULL;
196 static char **arg_property = NULL;
197 static sd_bus_message *arg_property_message = NULL;
198 static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO;
199 static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
200 static UserNamespaceOwnership arg_userns_ownership = _USER_NAMESPACE_OWNERSHIP_INVALID;
201 static int arg_kill_signal = 0;
202 static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN;
203 static SettingsMask arg_settings_mask = 0;
204 static int arg_settings_trusted = -1;
205 static char **arg_parameters = NULL;
206 static const char *arg_container_service_name = "systemd-nspawn";
207 static bool arg_notify_ready = false;
208 static bool arg_use_cgns = true;
209 static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS;
210 static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_TMPFS_TMP;
211 static VeritySettings arg_verity_settings = VERITY_SETTINGS_DEFAULT;
212 static char **arg_syscall_allow_list = NULL;
213 static char **arg_syscall_deny_list = NULL;
214 #if HAVE_SECCOMP
215 static scmp_filter_ctx arg_seccomp = NULL;
216 #endif
217 static struct rlimit *arg_rlimit[_RLIMIT_MAX] = {};
218 static bool arg_no_new_privileges = false;
219 static int arg_oom_score_adjust = 0;
220 static bool arg_oom_score_adjust_set = false;
221 static CPUSet arg_cpu_set = {};
222 static ResolvConfMode arg_resolv_conf = RESOLV_CONF_AUTO;
223 static TimezoneMode arg_timezone = TIMEZONE_AUTO;
224 static unsigned arg_console_width = UINT_MAX, arg_console_height = UINT_MAX;
225 static DeviceNode* arg_extra_nodes = NULL;
226 static size_t arg_n_extra_nodes = 0;
227 static char **arg_sysctl = NULL;
228 static ConsoleMode arg_console_mode = _CONSOLE_MODE_INVALID;
229 static Credential *arg_credentials = NULL;
230 static size_t arg_n_credentials = 0;
231 static char **arg_bind_user = NULL;
232 static bool arg_suppress_sync = false;
233 static char *arg_settings_filename = NULL;
234
235 STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
236 STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
237 STATIC_DESTRUCTOR_REGISTER(arg_chdir, freep);
238 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new, freep);
239 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old, freep);
240 STATIC_DESTRUCTOR_REGISTER(arg_user, freep);
241 STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids, freep);
242 STATIC_DESTRUCTOR_REGISTER(arg_machine, freep);
243 STATIC_DESTRUCTOR_REGISTER(arg_hostname, freep);
244 STATIC_DESTRUCTOR_REGISTER(arg_slice, freep);
245 STATIC_DESTRUCTOR_REGISTER(arg_setenv, strv_freep);
246 STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces, strv_freep);
247 STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan, strv_freep);
248 STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan, strv_freep);
249 STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra, strv_freep);
250 STATIC_DESTRUCTOR_REGISTER(arg_network_bridge, freep);
251 STATIC_DESTRUCTOR_REGISTER(arg_network_zone, freep);
252 STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path, freep);
253 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
254 STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle, freep);
255 STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep);
256 STATIC_DESTRUCTOR_REGISTER(arg_property_message, sd_bus_message_unrefp);
257 STATIC_DESTRUCTOR_REGISTER(arg_parameters, strv_freep);
258 STATIC_DESTRUCTOR_REGISTER(arg_verity_settings, verity_settings_done);
259 STATIC_DESTRUCTOR_REGISTER(arg_syscall_allow_list, strv_freep);
260 STATIC_DESTRUCTOR_REGISTER(arg_syscall_deny_list, strv_freep);
261 #if HAVE_SECCOMP
262 STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep);
263 #endif
264 STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset);
265 STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
266 STATIC_DESTRUCTOR_REGISTER(arg_bind_user, strv_freep);
267 STATIC_DESTRUCTOR_REGISTER(arg_settings_filename, freep);
268
269 static int handle_arg_console(const char *arg) {
270 if (streq(arg, "help")) {
271 puts("autopipe\n"
272 "interactive\n"
273 "passive\n"
274 "pipe\n"
275 "read-only");
276 return 0;
277 }
278
279 if (streq(arg, "interactive"))
280 arg_console_mode = CONSOLE_INTERACTIVE;
281 else if (streq(arg, "read-only"))
282 arg_console_mode = CONSOLE_READ_ONLY;
283 else if (streq(arg, "passive"))
284 arg_console_mode = CONSOLE_PASSIVE;
285 else if (streq(arg, "pipe")) {
286 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
287 log_full(arg_quiet ? LOG_DEBUG : LOG_NOTICE,
288 "Console mode 'pipe' selected, but standard input/output are connected to an interactive TTY. "
289 "Most likely you want to use 'interactive' console mode for proper interactivity and shell job control. "
290 "Proceeding anyway.");
291
292 arg_console_mode = CONSOLE_PIPE;
293 } else if (streq(arg, "autopipe")) {
294 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
295 arg_console_mode = CONSOLE_INTERACTIVE;
296 else
297 arg_console_mode = CONSOLE_PIPE;
298 } else
299 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown console mode: %s", optarg);
300
301 arg_settings_mask |= SETTING_CONSOLE_MODE;
302 return 1;
303 }
304
305 static int help(void) {
306 _cleanup_free_ char *link = NULL;
307 int r;
308
309 pager_open(arg_pager_flags);
310
311 r = terminal_urlify_man("systemd-nspawn", "1", &link);
312 if (r < 0)
313 return log_oom();
314
315 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
316 "%5$sSpawn a command or OS in a light-weight container.%6$s\n\n"
317 " -h --help Show this help\n"
318 " --version Print version string\n"
319 " -q --quiet Do not show status information\n"
320 " --no-pager Do not pipe output into a pager\n"
321 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
322 "%3$sImage:%4$s\n"
323 " -D --directory=PATH Root directory for the container\n"
324 " --template=PATH Initialize root directory from template directory,\n"
325 " if missing\n"
326 " -x --ephemeral Run container with snapshot of root directory, and\n"
327 " remove it after exit\n"
328 " -i --image=PATH Root file system disk image (or device node) for\n"
329 " the container\n"
330 " --oci-bundle=PATH OCI bundle directory\n"
331 " --read-only Mount the root directory read-only\n"
332 " --volatile[=MODE] Run the system in volatile mode\n"
333 " --root-hash=HASH Specify verity root hash for root disk image\n"
334 " --root-hash-sig=SIG Specify pkcs7 signature of root hash for verity\n"
335 " as a DER encoded PKCS7, either as a path to a file\n"
336 " or as an ASCII base64 encoded string prefixed by\n"
337 " 'base64:'\n"
338 " --verity-data=PATH Specify hash device for verity\n"
339 " --pivot-root=PATH[:PATH]\n"
340 " Pivot root to given directory in the container\n\n"
341 "%3$sExecution:%4$s\n"
342 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
343 " -b --boot Boot up full system (i.e. invoke init)\n"
344 " --chdir=PATH Set working directory in the container\n"
345 " -E --setenv=NAME[=VALUE] Pass an environment variable to PID 1\n"
346 " -u --user=USER Run the command under specified user or UID\n"
347 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
348 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
349 " --suppress-sync=BOOLEAN\n"
350 " Suppress any form of disk data synchronization\n\n"
351 "%3$sSystem Identity:%4$s\n"
352 " -M --machine=NAME Set the machine name for the container\n"
353 " --hostname=NAME Override the hostname for the container\n"
354 " --uuid=UUID Set a specific machine UUID for the container\n\n"
355 "%3$sProperties:%4$s\n"
356 " -S --slice=SLICE Place the container in the specified slice\n"
357 " --property=NAME=VALUE Set scope unit property\n"
358 " --register=BOOLEAN Register container as machine\n"
359 " --keep-unit Do not register a scope for the machine, reuse\n"
360 " the service unit nspawn is running in\n\n"
361 "%3$sUser Namespacing:%4$s\n"
362 " --private-users=no Run without user namespacing\n"
363 " --private-users=yes|pick|identity\n"
364 " Run within user namespace, autoselect UID/GID range\n"
365 " --private-users=UIDBASE[:NUIDS]\n"
366 " Similar, but with user configured UID/GID range\n"
367 " --private-users-ownership=MODE\n"
368 " Adjust ('chown') or map ('map') OS tree ownership\n"
369 " to private UID/GID range\n"
370 " -U Equivalent to --private-users=pick and\n"
371 " --private-users-ownership=auto\n\n"
372 "%3$sNetworking:%4$s\n"
373 " --private-network Disable network in container\n"
374 " --network-interface=INTERFACE\n"
375 " Assign an existing network interface to the\n"
376 " container\n"
377 " --network-macvlan=INTERFACE\n"
378 " Create a macvlan network interface based on an\n"
379 " existing network interface to the container\n"
380 " --network-ipvlan=INTERFACE\n"
381 " Create an ipvlan network interface based on an\n"
382 " existing network interface to the container\n"
383 " -n --network-veth Add a virtual Ethernet connection between host\n"
384 " and container\n"
385 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
386 " Add an additional virtual Ethernet link between\n"
387 " host and container\n"
388 " --network-bridge=INTERFACE\n"
389 " Add a virtual Ethernet connection to the container\n"
390 " and attach it to an existing bridge on the host\n"
391 " --network-zone=NAME Similar, but attach the new interface to an\n"
392 " an automatically managed bridge interface\n"
393 " --network-namespace-path=PATH\n"
394 " Set network namespace to the one represented by\n"
395 " the specified kernel namespace file node\n"
396 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
397 " Expose a container IP port on the host\n\n"
398 "%3$sSecurity:%4$s\n"
399 " --capability=CAP In addition to the default, retain specified\n"
400 " capability\n"
401 " --drop-capability=CAP Drop the specified capability from the default set\n"
402 " --ambient-capability=CAP\n"
403 " Sets the specified capability for the started\n"
404 " process. Not useful if booting a machine.\n"
405 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
406 " --system-call-filter=LIST|~LIST\n"
407 " Permit/prohibit specific system calls\n"
408 " -Z --selinux-context=SECLABEL\n"
409 " Set the SELinux security context to be used by\n"
410 " processes in the container\n"
411 " -L --selinux-apifs-context=SECLABEL\n"
412 " Set the SELinux security context to be used by\n"
413 " API/tmpfs file systems in the container\n\n"
414 "%3$sResources:%4$s\n"
415 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
416 " --oom-score-adjust=VALUE\n"
417 " Adjust the OOM score value for the payload\n"
418 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
419 " --personality=ARCH Pick personality for this container\n\n"
420 "%3$sIntegration:%4$s\n"
421 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
422 " --timezone=MODE Select mode of /etc/localtime initialization\n"
423 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
424 " host, try-guest, try-host\n"
425 " -j Equivalent to --link-journal=try-guest\n\n"
426 "%3$sMounts:%4$s\n"
427 " --bind=PATH[:PATH[:OPTIONS]]\n"
428 " Bind mount a file or directory from the host into\n"
429 " the container\n"
430 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
431 " Similar, but creates a read-only bind mount\n"
432 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
433 " it\n"
434 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
435 " --overlay=PATH[:PATH...]:PATH\n"
436 " Create an overlay mount from the host to \n"
437 " the container\n"
438 " --overlay-ro=PATH[:PATH...]:PATH\n"
439 " Similar, but creates a read-only overlay mount\n"
440 " --bind-user=NAME Bind user from host to container\n\n"
441 "%3$sInput/Output:%4$s\n"
442 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
443 " set up for the container.\n"
444 " -P --pipe Equivalent to --console=pipe\n\n"
445 "%3$sCredentials:%4$s\n"
446 " --set-credential=ID:VALUE\n"
447 " Pass a credential with literal value to container.\n"
448 " --load-credential=ID:PATH\n"
449 " Load credential to pass to container from file or\n"
450 " AF_UNIX stream socket.\n"
451 "\nSee the %2$s for details.\n",
452 program_invocation_short_name,
453 link,
454 ansi_underline(),
455 ansi_normal(),
456 ansi_highlight(),
457 ansi_normal());
458
459 return 0;
460 }
461
462 static int custom_mount_check_all(void) {
463 size_t i;
464
465 for (i = 0; i < arg_n_custom_mounts; i++) {
466 CustomMount *m = &arg_custom_mounts[i];
467
468 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
469 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_OFF)
470 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
471 "--private-users-ownership=own may not be combined with custom root mounts.");
472 if (arg_uid_shift == UID_INVALID)
473 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
474 "--private-users with automatic UID shift may not be combined with custom root mounts.");
475 }
476 }
477
478 return 0;
479 }
480
481 static int detect_unified_cgroup_hierarchy_from_environment(void) {
482 const char *e, *var = "SYSTEMD_NSPAWN_UNIFIED_HIERARCHY";
483 int r;
484
485 /* Allow the user to control whether the unified hierarchy is used */
486
487 e = getenv(var);
488 if (!e) {
489 /* $UNIFIED_CGROUP_HIERARCHY has been renamed to $SYSTEMD_NSPAWN_UNIFIED_HIERARCHY. */
490 var = "UNIFIED_CGROUP_HIERARCHY";
491 e = getenv(var);
492 }
493
494 if (!isempty(e)) {
495 r = parse_boolean(e);
496 if (r < 0)
497 return log_error_errno(r, "Failed to parse $%s: %m", var);
498 if (r > 0)
499 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
500 else
501 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
502 }
503
504 return 0;
505 }
506
507 static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
508 int r;
509
510 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
511 * in the image actually supports. */
512 r = cg_all_unified();
513 if (r < 0)
514 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
515 if (r > 0) {
516 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
517 * routine only detects 231, so we'll have a false negative here for 230. */
518 r = systemd_installation_has_version(directory, "230");
519 if (r < 0)
520 return log_error_errno(r, "Failed to determine systemd version in container: %m");
521 if (r > 0)
522 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
523 else
524 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
525 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
526 /* Mixed cgroup hierarchy support was added in 233 */
527 r = systemd_installation_has_version(directory, "233");
528 if (r < 0)
529 return log_error_errno(r, "Failed to determine systemd version in container: %m");
530 if (r > 0)
531 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
532 else
533 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
534 } else
535 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
536
537 log_debug("Using %s hierarchy for container.",
538 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_NONE ? "legacy" :
539 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_SYSTEMD ? "hybrid" : "unified");
540
541 return 0;
542 }
543
544 static int parse_capability_spec(const char *spec, uint64_t *ret_mask) {
545 uint64_t mask = 0;
546 int r;
547
548 for (;;) {
549 _cleanup_free_ char *t = NULL;
550
551 r = extract_first_word(&spec, &t, ",", 0);
552 if (r < 0)
553 return log_error_errno(r, "Failed to parse capability %s.", t);
554 if (r == 0)
555 break;
556
557 if (streq(t, "help")) {
558 for (int i = 0; i < capability_list_length(); i++) {
559 const char *name;
560
561 name = capability_to_name(i);
562 if (name)
563 puts(name);
564 }
565
566 return 0; /* quit */
567 }
568
569 if (streq(t, "all"))
570 mask = UINT64_MAX;
571 else {
572 r = capability_from_name(t);
573 if (r < 0)
574 return log_error_errno(r, "Failed to parse capability %s.", t);
575
576 mask |= 1ULL << r;
577 }
578 }
579
580 *ret_mask = mask;
581 return 1; /* continue */
582 }
583
584 static int parse_share_ns_env(const char *name, unsigned long ns_flag) {
585 int r;
586
587 r = getenv_bool(name);
588 if (r == -ENXIO)
589 return 0;
590 if (r < 0)
591 return log_error_errno(r, "Failed to parse $%s: %m", name);
592
593 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
594 arg_settings_mask |= SETTING_CLONE_NS_FLAGS;
595 return 0;
596 }
597
598 static int parse_mount_settings_env(void) {
599 const char *e;
600 int r;
601
602 r = getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
603 if (r < 0 && r != -ENXIO)
604 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP: %m");
605 if (r >= 0)
606 SET_FLAG(arg_mount_settings, MOUNT_APPLY_TMPFS_TMP, r > 0);
607
608 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
609 if (streq_ptr(e, "network"))
610 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
611
612 else if (e) {
613 r = parse_boolean(e);
614 if (r < 0)
615 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_API_VFS_WRITABLE: %m");
616
617 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0);
618 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false);
619 }
620
621 return 0;
622 }
623
624 static int parse_environment(void) {
625 const char *e;
626 int r;
627
628 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
629 if (r < 0)
630 return r;
631 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
632 if (r < 0)
633 return r;
634 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
635 if (r < 0)
636 return r;
637 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
638 if (r < 0)
639 return r;
640
641 r = parse_mount_settings_env();
642 if (r < 0)
643 return r;
644
645 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
646 * even if it is supported. If not supported, it has no effect. */
647 if (!cg_ns_supported())
648 arg_use_cgns = false;
649 else {
650 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
651 if (r < 0) {
652 if (r != -ENXIO)
653 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS: %m");
654
655 arg_use_cgns = true;
656 } else {
657 arg_use_cgns = r > 0;
658 arg_settings_mask |= SETTING_USE_CGNS;
659 }
660 }
661
662 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
663 if (e)
664 arg_container_service_name = e;
665
666 r = getenv_bool("SYSTEMD_SUPPRESS_SYNC");
667 if (r >= 0)
668 arg_suppress_sync = r;
669 else if (r != -ENXIO)
670 log_debug_errno(r, "Failed to parse $SYSTEMD_SUPPRESS_SYNC, ignoring: %m");
671
672 return detect_unified_cgroup_hierarchy_from_environment();
673 }
674
675 static int parse_argv(int argc, char *argv[]) {
676 enum {
677 ARG_VERSION = 0x100,
678 ARG_PRIVATE_NETWORK,
679 ARG_UUID,
680 ARG_READ_ONLY,
681 ARG_CAPABILITY,
682 ARG_AMBIENT_CAPABILITY,
683 ARG_DROP_CAPABILITY,
684 ARG_LINK_JOURNAL,
685 ARG_BIND,
686 ARG_BIND_RO,
687 ARG_TMPFS,
688 ARG_OVERLAY,
689 ARG_OVERLAY_RO,
690 ARG_INACCESSIBLE,
691 ARG_SHARE_SYSTEM,
692 ARG_REGISTER,
693 ARG_KEEP_UNIT,
694 ARG_NETWORK_INTERFACE,
695 ARG_NETWORK_MACVLAN,
696 ARG_NETWORK_IPVLAN,
697 ARG_NETWORK_BRIDGE,
698 ARG_NETWORK_ZONE,
699 ARG_NETWORK_VETH_EXTRA,
700 ARG_NETWORK_NAMESPACE_PATH,
701 ARG_PERSONALITY,
702 ARG_VOLATILE,
703 ARG_TEMPLATE,
704 ARG_PROPERTY,
705 ARG_PRIVATE_USERS,
706 ARG_KILL_SIGNAL,
707 ARG_SETTINGS,
708 ARG_CHDIR,
709 ARG_PIVOT_ROOT,
710 ARG_PRIVATE_USERS_CHOWN,
711 ARG_PRIVATE_USERS_OWNERSHIP,
712 ARG_NOTIFY_READY,
713 ARG_ROOT_HASH,
714 ARG_ROOT_HASH_SIG,
715 ARG_VERITY_DATA,
716 ARG_SYSTEM_CALL_FILTER,
717 ARG_RLIMIT,
718 ARG_HOSTNAME,
719 ARG_NO_NEW_PRIVILEGES,
720 ARG_OOM_SCORE_ADJUST,
721 ARG_CPU_AFFINITY,
722 ARG_RESOLV_CONF,
723 ARG_TIMEZONE,
724 ARG_CONSOLE,
725 ARG_PIPE,
726 ARG_OCI_BUNDLE,
727 ARG_NO_PAGER,
728 ARG_SET_CREDENTIAL,
729 ARG_LOAD_CREDENTIAL,
730 ARG_BIND_USER,
731 ARG_SUPPRESS_SYNC,
732 };
733
734 static const struct option options[] = {
735 { "help", no_argument, NULL, 'h' },
736 { "version", no_argument, NULL, ARG_VERSION },
737 { "directory", required_argument, NULL, 'D' },
738 { "template", required_argument, NULL, ARG_TEMPLATE },
739 { "ephemeral", no_argument, NULL, 'x' },
740 { "user", required_argument, NULL, 'u' },
741 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
742 { "as-pid2", no_argument, NULL, 'a' },
743 { "boot", no_argument, NULL, 'b' },
744 { "uuid", required_argument, NULL, ARG_UUID },
745 { "read-only", no_argument, NULL, ARG_READ_ONLY },
746 { "capability", required_argument, NULL, ARG_CAPABILITY },
747 { "ambient-capability", required_argument, NULL, ARG_AMBIENT_CAPABILITY },
748 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
749 { "no-new-privileges", required_argument, NULL, ARG_NO_NEW_PRIVILEGES },
750 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
751 { "bind", required_argument, NULL, ARG_BIND },
752 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
753 { "tmpfs", required_argument, NULL, ARG_TMPFS },
754 { "overlay", required_argument, NULL, ARG_OVERLAY },
755 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
756 { "inaccessible", required_argument, NULL, ARG_INACCESSIBLE },
757 { "machine", required_argument, NULL, 'M' },
758 { "hostname", required_argument, NULL, ARG_HOSTNAME },
759 { "slice", required_argument, NULL, 'S' },
760 { "setenv", required_argument, NULL, 'E' },
761 { "selinux-context", required_argument, NULL, 'Z' },
762 { "selinux-apifs-context", required_argument, NULL, 'L' },
763 { "quiet", no_argument, NULL, 'q' },
764 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
765 { "register", required_argument, NULL, ARG_REGISTER },
766 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
767 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
768 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
769 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
770 { "network-veth", no_argument, NULL, 'n' },
771 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
772 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
773 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
774 { "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH },
775 { "personality", required_argument, NULL, ARG_PERSONALITY },
776 { "image", required_argument, NULL, 'i' },
777 { "volatile", optional_argument, NULL, ARG_VOLATILE },
778 { "port", required_argument, NULL, 'p' },
779 { "property", required_argument, NULL, ARG_PROPERTY },
780 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
781 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN }, /* obsolete */
782 { "private-users-ownership",required_argument, NULL, ARG_PRIVATE_USERS_OWNERSHIP},
783 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
784 { "settings", required_argument, NULL, ARG_SETTINGS },
785 { "chdir", required_argument, NULL, ARG_CHDIR },
786 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
787 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
788 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
789 { "root-hash-sig", required_argument, NULL, ARG_ROOT_HASH_SIG },
790 { "verity-data", required_argument, NULL, ARG_VERITY_DATA },
791 { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
792 { "rlimit", required_argument, NULL, ARG_RLIMIT },
793 { "oom-score-adjust", required_argument, NULL, ARG_OOM_SCORE_ADJUST },
794 { "cpu-affinity", required_argument, NULL, ARG_CPU_AFFINITY },
795 { "resolv-conf", required_argument, NULL, ARG_RESOLV_CONF },
796 { "timezone", required_argument, NULL, ARG_TIMEZONE },
797 { "console", required_argument, NULL, ARG_CONSOLE },
798 { "pipe", no_argument, NULL, ARG_PIPE },
799 { "oci-bundle", required_argument, NULL, ARG_OCI_BUNDLE },
800 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
801 { "set-credential", required_argument, NULL, ARG_SET_CREDENTIAL },
802 { "load-credential", required_argument, NULL, ARG_LOAD_CREDENTIAL },
803 { "bind-user", required_argument, NULL, ARG_BIND_USER },
804 { "suppress-sync", required_argument, NULL, ARG_SUPPRESS_SYNC },
805 {}
806 };
807
808 int c, r;
809 uint64_t plus = 0, minus = 0;
810 bool mask_all_settings = false, mask_no_settings = false;
811
812 assert(argc >= 0);
813 assert(argv);
814
815 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0)
816 switch (c) {
817
818 case 'h':
819 return help();
820
821 case ARG_VERSION:
822 return version();
823
824 case 'D':
825 r = parse_path_argument(optarg, false, &arg_directory);
826 if (r < 0)
827 return r;
828
829 arg_settings_mask |= SETTING_DIRECTORY;
830 break;
831
832 case ARG_TEMPLATE:
833 r = parse_path_argument(optarg, false, &arg_template);
834 if (r < 0)
835 return r;
836
837 arg_settings_mask |= SETTING_DIRECTORY;
838 break;
839
840 case 'i':
841 r = parse_path_argument(optarg, false, &arg_image);
842 if (r < 0)
843 return r;
844
845 arg_settings_mask |= SETTING_DIRECTORY;
846 break;
847
848 case ARG_OCI_BUNDLE:
849 r = parse_path_argument(optarg, false, &arg_oci_bundle);
850 if (r < 0)
851 return r;
852
853 break;
854
855 case 'x':
856 arg_ephemeral = true;
857 arg_settings_mask |= SETTING_EPHEMERAL;
858 break;
859
860 case 'u':
861 r = free_and_strdup(&arg_user, optarg);
862 if (r < 0)
863 return log_oom();
864
865 arg_settings_mask |= SETTING_USER;
866 break;
867
868 case ARG_NETWORK_ZONE: {
869 char *j;
870
871 j = strjoin("vz-", optarg);
872 if (!j)
873 return log_oom();
874
875 if (!ifname_valid(j)) {
876 log_error("Network zone name not valid: %s", j);
877 free(j);
878 return -EINVAL;
879 }
880
881 free_and_replace(arg_network_zone, j);
882
883 arg_network_veth = true;
884 arg_private_network = true;
885 arg_settings_mask |= SETTING_NETWORK;
886 break;
887 }
888
889 case ARG_NETWORK_BRIDGE:
890
891 if (!ifname_valid(optarg))
892 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
893 "Bridge interface name not valid: %s", optarg);
894
895 r = free_and_strdup(&arg_network_bridge, optarg);
896 if (r < 0)
897 return log_oom();
898
899 _fallthrough_;
900 case 'n':
901 arg_network_veth = true;
902 arg_private_network = true;
903 arg_settings_mask |= SETTING_NETWORK;
904 break;
905
906 case ARG_NETWORK_VETH_EXTRA:
907 r = veth_extra_parse(&arg_network_veth_extra, optarg);
908 if (r < 0)
909 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
910
911 arg_private_network = true;
912 arg_settings_mask |= SETTING_NETWORK;
913 break;
914
915 case ARG_NETWORK_INTERFACE:
916 if (!ifname_valid(optarg))
917 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
918 "Network interface name not valid: %s", optarg);
919
920 r = test_network_interface_initialized(optarg);
921 if (r < 0)
922 return r;
923
924 if (strv_extend(&arg_network_interfaces, optarg) < 0)
925 return log_oom();
926
927 arg_private_network = true;
928 arg_settings_mask |= SETTING_NETWORK;
929 break;
930
931 case ARG_NETWORK_MACVLAN:
932
933 if (!ifname_valid(optarg))
934 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
935 "MACVLAN network interface name not valid: %s", optarg);
936
937 r = test_network_interface_initialized(optarg);
938 if (r < 0)
939 return r;
940
941 if (strv_extend(&arg_network_macvlan, optarg) < 0)
942 return log_oom();
943
944 arg_private_network = true;
945 arg_settings_mask |= SETTING_NETWORK;
946 break;
947
948 case ARG_NETWORK_IPVLAN:
949
950 if (!ifname_valid(optarg))
951 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
952 "IPVLAN network interface name not valid: %s", optarg);
953
954 r = test_network_interface_initialized(optarg);
955 if (r < 0)
956 return r;
957
958 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
959 return log_oom();
960
961 _fallthrough_;
962 case ARG_PRIVATE_NETWORK:
963 arg_private_network = true;
964 arg_settings_mask |= SETTING_NETWORK;
965 break;
966
967 case ARG_NETWORK_NAMESPACE_PATH:
968 r = parse_path_argument(optarg, false, &arg_network_namespace_path);
969 if (r < 0)
970 return r;
971
972 arg_settings_mask |= SETTING_NETWORK;
973 break;
974
975 case 'b':
976 if (arg_start_mode == START_PID2)
977 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
978 "--boot and --as-pid2 may not be combined.");
979
980 arg_start_mode = START_BOOT;
981 arg_settings_mask |= SETTING_START_MODE;
982 break;
983
984 case 'a':
985 if (arg_start_mode == START_BOOT)
986 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
987 "--boot and --as-pid2 may not be combined.");
988
989 arg_start_mode = START_PID2;
990 arg_settings_mask |= SETTING_START_MODE;
991 break;
992
993 case ARG_UUID:
994 r = sd_id128_from_string(optarg, &arg_uuid);
995 if (r < 0)
996 return log_error_errno(r, "Invalid UUID: %s", optarg);
997
998 if (sd_id128_is_null(arg_uuid))
999 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1000 "Machine UUID may not be all zeroes.");
1001
1002 arg_settings_mask |= SETTING_MACHINE_ID;
1003 break;
1004
1005 case 'S': {
1006 _cleanup_free_ char *mangled = NULL;
1007
1008 r = unit_name_mangle_with_suffix(optarg, NULL, UNIT_NAME_MANGLE_WARN, ".slice", &mangled);
1009 if (r < 0)
1010 return log_oom();
1011
1012 free_and_replace(arg_slice, mangled);
1013 arg_settings_mask |= SETTING_SLICE;
1014 break;
1015 }
1016
1017 case 'M':
1018 if (isempty(optarg))
1019 arg_machine = mfree(arg_machine);
1020 else {
1021 if (!hostname_is_valid(optarg, 0))
1022 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1023 "Invalid machine name: %s", optarg);
1024
1025 r = free_and_strdup(&arg_machine, optarg);
1026 if (r < 0)
1027 return log_oom();
1028 }
1029 break;
1030
1031 case ARG_HOSTNAME:
1032 if (isempty(optarg))
1033 arg_hostname = mfree(arg_hostname);
1034 else {
1035 if (!hostname_is_valid(optarg, 0))
1036 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1037 "Invalid hostname: %s", optarg);
1038
1039 r = free_and_strdup(&arg_hostname, optarg);
1040 if (r < 0)
1041 return log_oom();
1042 }
1043
1044 arg_settings_mask |= SETTING_HOSTNAME;
1045 break;
1046
1047 case 'Z':
1048 arg_selinux_context = optarg;
1049 break;
1050
1051 case 'L':
1052 arg_selinux_apifs_context = optarg;
1053 break;
1054
1055 case ARG_READ_ONLY:
1056 arg_read_only = true;
1057 arg_settings_mask |= SETTING_READ_ONLY;
1058 break;
1059
1060 case ARG_AMBIENT_CAPABILITY: {
1061 uint64_t m;
1062 r = parse_capability_spec(optarg, &m);
1063 if (r <= 0)
1064 return r;
1065 arg_caps_ambient |= m;
1066 arg_settings_mask |= SETTING_CAPABILITY;
1067 break;
1068 }
1069 case ARG_CAPABILITY:
1070 case ARG_DROP_CAPABILITY: {
1071 uint64_t m;
1072 r = parse_capability_spec(optarg, &m);
1073 if (r <= 0)
1074 return r;
1075
1076 if (c == ARG_CAPABILITY)
1077 plus |= m;
1078 else
1079 minus |= m;
1080 arg_settings_mask |= SETTING_CAPABILITY;
1081 break;
1082 }
1083 case ARG_NO_NEW_PRIVILEGES:
1084 r = parse_boolean(optarg);
1085 if (r < 0)
1086 return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg);
1087
1088 arg_no_new_privileges = r;
1089 arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES;
1090 break;
1091
1092 case 'j':
1093 arg_link_journal = LINK_GUEST;
1094 arg_link_journal_try = true;
1095 arg_settings_mask |= SETTING_LINK_JOURNAL;
1096 break;
1097
1098 case ARG_LINK_JOURNAL:
1099 r = parse_link_journal(optarg, &arg_link_journal, &arg_link_journal_try);
1100 if (r < 0)
1101 return log_error_errno(r, "Failed to parse link journal mode %s", optarg);
1102
1103 arg_settings_mask |= SETTING_LINK_JOURNAL;
1104 break;
1105
1106 case ARG_BIND:
1107 case ARG_BIND_RO:
1108 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
1109 if (r < 0)
1110 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
1111
1112 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1113 break;
1114
1115 case ARG_TMPFS:
1116 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1117 if (r < 0)
1118 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
1119
1120 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1121 break;
1122
1123 case ARG_OVERLAY:
1124 case ARG_OVERLAY_RO:
1125 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
1126 if (r == -EADDRNOTAVAIL)
1127 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
1128 if (r < 0)
1129 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
1130
1131 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1132 break;
1133
1134 case ARG_INACCESSIBLE:
1135 r = inaccessible_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1136 if (r < 0)
1137 return log_error_errno(r, "Failed to parse --inaccessible= argument %s: %m", optarg);
1138
1139 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1140 break;
1141
1142 case 'E':
1143 r = strv_env_replace_strdup_passthrough(&arg_setenv, optarg);
1144 if (r < 0)
1145 return log_error_errno(r, "Cannot assign environment variable %s: %m", optarg);
1146
1147 arg_settings_mask |= SETTING_ENVIRONMENT;
1148 break;
1149
1150 case 'q':
1151 arg_quiet = true;
1152 break;
1153
1154 case ARG_SHARE_SYSTEM:
1155 /* We don't officially support this anymore, except for compat reasons. People should use the
1156 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
1157 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
1158 arg_clone_ns_flags = 0;
1159 break;
1160
1161 case ARG_REGISTER:
1162 r = parse_boolean(optarg);
1163 if (r < 0) {
1164 log_error("Failed to parse --register= argument: %s", optarg);
1165 return r;
1166 }
1167
1168 arg_register = r;
1169 break;
1170
1171 case ARG_KEEP_UNIT:
1172 arg_keep_unit = true;
1173 break;
1174
1175 case ARG_PERSONALITY:
1176
1177 arg_personality = personality_from_string(optarg);
1178 if (arg_personality == PERSONALITY_INVALID)
1179 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1180 "Unknown or unsupported personality '%s'.", optarg);
1181
1182 arg_settings_mask |= SETTING_PERSONALITY;
1183 break;
1184
1185 case ARG_VOLATILE:
1186
1187 if (!optarg)
1188 arg_volatile_mode = VOLATILE_YES;
1189 else if (streq(optarg, "help")) {
1190 DUMP_STRING_TABLE(volatile_mode, VolatileMode, _VOLATILE_MODE_MAX);
1191 return 0;
1192 } else {
1193 VolatileMode m;
1194
1195 m = volatile_mode_from_string(optarg);
1196 if (m < 0)
1197 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1198 "Failed to parse --volatile= argument: %s", optarg);
1199 else
1200 arg_volatile_mode = m;
1201 }
1202
1203 arg_settings_mask |= SETTING_VOLATILE_MODE;
1204 break;
1205
1206 case 'p':
1207 r = expose_port_parse(&arg_expose_ports, optarg);
1208 if (r == -EEXIST)
1209 return log_error_errno(r, "Duplicate port specification: %s", optarg);
1210 if (r < 0)
1211 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
1212
1213 arg_settings_mask |= SETTING_EXPOSE_PORTS;
1214 break;
1215
1216 case ARG_PROPERTY:
1217 if (strv_extend(&arg_property, optarg) < 0)
1218 return log_oom();
1219
1220 break;
1221
1222 case ARG_PRIVATE_USERS: {
1223 int boolean;
1224
1225 if (!optarg)
1226 boolean = true;
1227 else if (!in_charset(optarg, DIGITS))
1228 /* do *not* parse numbers as booleans */
1229 boolean = parse_boolean(optarg);
1230 else
1231 boolean = -1;
1232
1233 if (boolean == 0) {
1234 /* no: User namespacing off */
1235 arg_userns_mode = USER_NAMESPACE_NO;
1236 arg_uid_shift = UID_INVALID;
1237 arg_uid_range = UINT32_C(0x10000);
1238 } else if (boolean > 0) {
1239 /* yes: User namespacing on, UID range is read from root dir */
1240 arg_userns_mode = USER_NAMESPACE_FIXED;
1241 arg_uid_shift = UID_INVALID;
1242 arg_uid_range = UINT32_C(0x10000);
1243 } else if (streq(optarg, "pick")) {
1244 /* pick: User namespacing on, UID range is picked randomly */
1245 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1246 * implied by USER_NAMESPACE_PICK
1247 * further down. */
1248 arg_uid_shift = UID_INVALID;
1249 arg_uid_range = UINT32_C(0x10000);
1250
1251 } else if (streq(optarg, "identity")) {
1252 /* identitiy: User namespaces on, UID range is map the 0…0xFFFF range to
1253 * itself, i.e. we don't actually map anything, but do take benefit of
1254 * isolation of capability sets. */
1255 arg_userns_mode = USER_NAMESPACE_FIXED;
1256 arg_uid_shift = 0;
1257 arg_uid_range = UINT32_C(0x10000);
1258 } else {
1259 _cleanup_free_ char *buffer = NULL;
1260 const char *range, *shift;
1261
1262 /* anything else: User namespacing on, UID range is explicitly configured */
1263
1264 range = strchr(optarg, ':');
1265 if (range) {
1266 buffer = strndup(optarg, range - optarg);
1267 if (!buffer)
1268 return log_oom();
1269 shift = buffer;
1270
1271 range++;
1272 r = safe_atou32(range, &arg_uid_range);
1273 if (r < 0)
1274 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
1275 } else
1276 shift = optarg;
1277
1278 r = parse_uid(shift, &arg_uid_shift);
1279 if (r < 0)
1280 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
1281
1282 arg_userns_mode = USER_NAMESPACE_FIXED;
1283
1284 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
1285 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID range cannot be empty or go beyond " UID_FMT ".", UID_INVALID);
1286 }
1287
1288 arg_settings_mask |= SETTING_USERNS;
1289 break;
1290 }
1291
1292 case 'U':
1293 if (userns_supported()) {
1294 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1295 * implied by USER_NAMESPACE_PICK
1296 * further down. */
1297 arg_uid_shift = UID_INVALID;
1298 arg_uid_range = UINT32_C(0x10000);
1299
1300 arg_settings_mask |= SETTING_USERNS;
1301 }
1302
1303 break;
1304
1305 case ARG_PRIVATE_USERS_CHOWN:
1306 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
1307
1308 arg_settings_mask |= SETTING_USERNS;
1309 break;
1310
1311 case ARG_PRIVATE_USERS_OWNERSHIP:
1312 if (streq(optarg, "help")) {
1313 DUMP_STRING_TABLE(user_namespace_ownership, UserNamespaceOwnership, _USER_NAMESPACE_OWNERSHIP_MAX);
1314 return 0;
1315 }
1316
1317 arg_userns_ownership = user_namespace_ownership_from_string(optarg);
1318 if (arg_userns_ownership < 0)
1319 return log_error_errno(arg_userns_ownership, "Cannot parse --user-namespace-ownership= value: %s", optarg);
1320
1321 arg_settings_mask |= SETTING_USERNS;
1322 break;
1323
1324 case ARG_KILL_SIGNAL:
1325 if (streq(optarg, "help")) {
1326 DUMP_STRING_TABLE(signal, int, _NSIG);
1327 return 0;
1328 }
1329
1330 arg_kill_signal = signal_from_string(optarg);
1331 if (arg_kill_signal < 0)
1332 return log_error_errno(arg_kill_signal, "Cannot parse signal: %s", optarg);
1333
1334 arg_settings_mask |= SETTING_KILL_SIGNAL;
1335 break;
1336
1337 case ARG_SETTINGS:
1338
1339 /* no → do not read files
1340 * yes → read files, do not override cmdline, trust only subset
1341 * override → read files, override cmdline, trust only subset
1342 * trusted → read files, do not override cmdline, trust all
1343 */
1344
1345 r = parse_boolean(optarg);
1346 if (r < 0) {
1347 if (streq(optarg, "trusted")) {
1348 mask_all_settings = false;
1349 mask_no_settings = false;
1350 arg_settings_trusted = true;
1351
1352 } else if (streq(optarg, "override")) {
1353 mask_all_settings = false;
1354 mask_no_settings = true;
1355 arg_settings_trusted = -1;
1356 } else
1357 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
1358 } else if (r > 0) {
1359 /* yes */
1360 mask_all_settings = false;
1361 mask_no_settings = false;
1362 arg_settings_trusted = -1;
1363 } else {
1364 /* no */
1365 mask_all_settings = true;
1366 mask_no_settings = false;
1367 arg_settings_trusted = false;
1368 }
1369
1370 break;
1371
1372 case ARG_CHDIR:
1373 if (!path_is_absolute(optarg))
1374 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1375 "Working directory %s is not an absolute path.", optarg);
1376
1377 r = free_and_strdup(&arg_chdir, optarg);
1378 if (r < 0)
1379 return log_oom();
1380
1381 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1382 break;
1383
1384 case ARG_PIVOT_ROOT:
1385 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1386 if (r < 0)
1387 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1388
1389 arg_settings_mask |= SETTING_PIVOT_ROOT;
1390 break;
1391
1392 case ARG_NOTIFY_READY:
1393 r = parse_boolean(optarg);
1394 if (r < 0)
1395 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1396 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
1397 arg_notify_ready = r;
1398 arg_settings_mask |= SETTING_NOTIFY_READY;
1399 break;
1400
1401 case ARG_ROOT_HASH: {
1402 _cleanup_free_ void *k = NULL;
1403 size_t l;
1404
1405 r = unhexmem(optarg, strlen(optarg), &k, &l);
1406 if (r < 0)
1407 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
1408 if (l < sizeof(sd_id128_t))
1409 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg);
1410
1411 free_and_replace(arg_verity_settings.root_hash, k);
1412 arg_verity_settings.root_hash_size = l;
1413 break;
1414 }
1415
1416 case ARG_ROOT_HASH_SIG: {
1417 char *value;
1418 size_t l;
1419 void *p;
1420
1421 if ((value = startswith(optarg, "base64:"))) {
1422 r = unbase64mem(value, strlen(value), &p, &l);
1423 if (r < 0)
1424 return log_error_errno(r, "Failed to parse root hash signature '%s': %m", optarg);
1425
1426 } else {
1427 r = read_full_file(optarg, (char**) &p, &l);
1428 if (r < 0)
1429 return log_error_errno(r, "Failed parse root hash signature file '%s': %m", optarg);
1430 }
1431
1432 free_and_replace(arg_verity_settings.root_hash_sig, p);
1433 arg_verity_settings.root_hash_sig_size = l;
1434 break;
1435 }
1436
1437 case ARG_VERITY_DATA:
1438 r = parse_path_argument(optarg, false, &arg_verity_settings.data_path);
1439 if (r < 0)
1440 return r;
1441 break;
1442
1443 case ARG_SYSTEM_CALL_FILTER: {
1444 bool negative;
1445 const char *items;
1446
1447 negative = optarg[0] == '~';
1448 items = negative ? optarg + 1 : optarg;
1449
1450 for (;;) {
1451 _cleanup_free_ char *word = NULL;
1452
1453 r = extract_first_word(&items, &word, NULL, 0);
1454 if (r == 0)
1455 break;
1456 if (r == -ENOMEM)
1457 return log_oom();
1458 if (r < 0)
1459 return log_error_errno(r, "Failed to parse system call filter: %m");
1460
1461 if (negative)
1462 r = strv_extend(&arg_syscall_deny_list, word);
1463 else
1464 r = strv_extend(&arg_syscall_allow_list, word);
1465 if (r < 0)
1466 return log_oom();
1467 }
1468
1469 arg_settings_mask |= SETTING_SYSCALL_FILTER;
1470 break;
1471 }
1472
1473 case ARG_RLIMIT: {
1474 const char *eq;
1475 _cleanup_free_ char *name = NULL;
1476 int rl;
1477
1478 if (streq(optarg, "help")) {
1479 DUMP_STRING_TABLE(rlimit, int, _RLIMIT_MAX);
1480 return 0;
1481 }
1482
1483 eq = strchr(optarg, '=');
1484 if (!eq)
1485 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1486 "--rlimit= expects an '=' assignment.");
1487
1488 name = strndup(optarg, eq - optarg);
1489 if (!name)
1490 return log_oom();
1491
1492 rl = rlimit_from_string_harder(name);
1493 if (rl < 0)
1494 return log_error_errno(rl, "Unknown resource limit: %s", name);
1495
1496 if (!arg_rlimit[rl]) {
1497 arg_rlimit[rl] = new0(struct rlimit, 1);
1498 if (!arg_rlimit[rl])
1499 return log_oom();
1500 }
1501
1502 r = rlimit_parse(rl, eq + 1, arg_rlimit[rl]);
1503 if (r < 0)
1504 return log_error_errno(r, "Failed to parse resource limit: %s", eq + 1);
1505
1506 arg_settings_mask |= SETTING_RLIMIT_FIRST << rl;
1507 break;
1508 }
1509
1510 case ARG_OOM_SCORE_ADJUST:
1511 r = parse_oom_score_adjust(optarg, &arg_oom_score_adjust);
1512 if (r < 0)
1513 return log_error_errno(r, "Failed to parse --oom-score-adjust= parameter: %s", optarg);
1514
1515 arg_oom_score_adjust_set = true;
1516 arg_settings_mask |= SETTING_OOM_SCORE_ADJUST;
1517 break;
1518
1519 case ARG_CPU_AFFINITY: {
1520 CPUSet cpuset;
1521
1522 r = parse_cpu_set(optarg, &cpuset);
1523 if (r < 0)
1524 return log_error_errno(r, "Failed to parse CPU affinity mask %s: %m", optarg);
1525
1526 cpu_set_reset(&arg_cpu_set);
1527 arg_cpu_set = cpuset;
1528 arg_settings_mask |= SETTING_CPU_AFFINITY;
1529 break;
1530 }
1531
1532 case ARG_RESOLV_CONF:
1533 if (streq(optarg, "help")) {
1534 DUMP_STRING_TABLE(resolv_conf_mode, ResolvConfMode, _RESOLV_CONF_MODE_MAX);
1535 return 0;
1536 }
1537
1538 arg_resolv_conf = resolv_conf_mode_from_string(optarg);
1539 if (arg_resolv_conf < 0)
1540 return log_error_errno(arg_resolv_conf,
1541 "Failed to parse /etc/resolv.conf mode: %s", optarg);
1542
1543 arg_settings_mask |= SETTING_RESOLV_CONF;
1544 break;
1545
1546 case ARG_TIMEZONE:
1547 if (streq(optarg, "help")) {
1548 DUMP_STRING_TABLE(timezone_mode, TimezoneMode, _TIMEZONE_MODE_MAX);
1549 return 0;
1550 }
1551
1552 arg_timezone = timezone_mode_from_string(optarg);
1553 if (arg_timezone < 0)
1554 return log_error_errno(arg_timezone,
1555 "Failed to parse /etc/localtime mode: %s", optarg);
1556
1557 arg_settings_mask |= SETTING_TIMEZONE;
1558 break;
1559
1560 case ARG_CONSOLE:
1561 r = handle_arg_console(optarg);
1562 if (r <= 0)
1563 return r;
1564 break;
1565
1566 case 'P':
1567 case ARG_PIPE:
1568 r = handle_arg_console("pipe");
1569 if (r <= 0)
1570 return r;
1571 break;
1572
1573 case ARG_NO_PAGER:
1574 arg_pager_flags |= PAGER_DISABLE;
1575 break;
1576
1577 case ARG_SET_CREDENTIAL: {
1578 _cleanup_free_ char *word = NULL, *data = NULL;
1579 const char *p = optarg;
1580 Credential *a;
1581 ssize_t l;
1582
1583 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1584 if (r == -ENOMEM)
1585 return log_oom();
1586 if (r < 0)
1587 return log_error_errno(r, "Failed to parse --set-credential= parameter: %m");
1588 if (r == 0 || !p)
1589 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --set-credential=: %s", optarg);
1590
1591 if (!credential_name_valid(word))
1592 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1593
1594 for (size_t i = 0; i < arg_n_credentials; i++)
1595 if (streq(arg_credentials[i].id, word))
1596 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1597
1598 l = cunescape(p, UNESCAPE_ACCEPT_NUL, &data);
1599 if (l < 0)
1600 return log_error_errno(l, "Failed to unescape credential data: %s", p);
1601
1602 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1603 if (!a)
1604 return log_oom();
1605
1606 a[arg_n_credentials++] = (Credential) {
1607 .id = TAKE_PTR(word),
1608 .data = TAKE_PTR(data),
1609 .size = l,
1610 };
1611
1612 arg_credentials = a;
1613
1614 arg_settings_mask |= SETTING_CREDENTIALS;
1615 break;
1616 }
1617
1618 case ARG_LOAD_CREDENTIAL: {
1619 ReadFullFileFlags flags = READ_FULL_FILE_SECURE;
1620 _cleanup_(erase_and_freep) char *data = NULL;
1621 _cleanup_free_ char *word = NULL, *j = NULL;
1622 const char *p = optarg;
1623 Credential *a;
1624 size_t size, i;
1625
1626 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1627 if (r == -ENOMEM)
1628 return log_oom();
1629 if (r < 0)
1630 return log_error_errno(r, "Failed to parse --load-credential= parameter: %m");
1631 if (r == 0 || !p)
1632 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --load-credential=: %s", optarg);
1633
1634 if (!credential_name_valid(word))
1635 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1636
1637 for (i = 0; i < arg_n_credentials; i++)
1638 if (streq(arg_credentials[i].id, word))
1639 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1640
1641 if (path_is_absolute(p))
1642 flags |= READ_FULL_FILE_CONNECT_SOCKET;
1643 else {
1644 const char *e;
1645
1646 r = get_credentials_dir(&e);
1647 if (r < 0)
1648 return log_error_errno(r, "Credential not available (no credentials passed at all): %s", word);
1649
1650 j = path_join(e, p);
1651 if (!j)
1652 return log_oom();
1653 }
1654
1655 r = read_full_file_full(AT_FDCWD, j ?: p, UINT64_MAX, SIZE_MAX,
1656 flags,
1657 NULL,
1658 &data, &size);
1659 if (r < 0)
1660 return log_error_errno(r, "Failed to read credential '%s': %m", j ?: p);
1661
1662 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1663 if (!a)
1664 return log_oom();
1665
1666 a[arg_n_credentials++] = (Credential) {
1667 .id = TAKE_PTR(word),
1668 .data = TAKE_PTR(data),
1669 .size = size,
1670 };
1671
1672 arg_credentials = a;
1673
1674 arg_settings_mask |= SETTING_CREDENTIALS;
1675 break;
1676 }
1677
1678 case ARG_BIND_USER:
1679 if (!valid_user_group_name(optarg, 0))
1680 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid user name to bind: %s", optarg);
1681
1682 if (strv_extend(&arg_bind_user, optarg) < 0)
1683 return log_oom();
1684
1685 arg_settings_mask |= SETTING_BIND_USER;
1686 break;
1687
1688 case ARG_SUPPRESS_SYNC:
1689 r = parse_boolean_argument("--suppress-sync=", optarg, &arg_suppress_sync);
1690 if (r < 0)
1691 return r;
1692
1693 arg_settings_mask |= SETTING_SUPPRESS_SYNC;
1694 break;
1695
1696 case '?':
1697 return -EINVAL;
1698
1699 default:
1700 assert_not_reached();
1701 }
1702
1703 if (argc > optind) {
1704 strv_free(arg_parameters);
1705 arg_parameters = strv_copy(argv + optind);
1706 if (!arg_parameters)
1707 return log_oom();
1708
1709 arg_settings_mask |= SETTING_START_MODE;
1710 }
1711
1712 if (arg_ephemeral && arg_template && !arg_directory)
1713 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1714 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1715 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1716 * --directory=". */
1717 arg_directory = TAKE_PTR(arg_template);
1718
1719 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? UINT64_C(1) << CAP_NET_ADMIN : 0)) & ~minus;
1720
1721 /* Make sure to parse environment before we reset the settings mask below */
1722 r = parse_environment();
1723 if (r < 0)
1724 return r;
1725
1726 /* Load all settings from .nspawn files */
1727 if (mask_no_settings)
1728 arg_settings_mask = 0;
1729
1730 /* Don't load any settings from .nspawn files */
1731 if (mask_all_settings)
1732 arg_settings_mask = _SETTINGS_MASK_ALL;
1733
1734 return 1;
1735 }
1736
1737 static int verify_arguments(void) {
1738 int r;
1739
1740 if (arg_start_mode == START_PID2 && arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
1741 /* If we are running the stub init in the container, we don't need to look at what the init
1742 * in the container supports, because we are not using it. Let's immediately pick the right
1743 * setting based on the host system configuration.
1744 *
1745 * We only do this, if the user didn't use an environment variable to override the detection.
1746 */
1747
1748 r = cg_all_unified();
1749 if (r < 0)
1750 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
1751 if (r > 0)
1752 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
1753 else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)
1754 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
1755 else
1756 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
1757 }
1758
1759 if (arg_userns_mode != USER_NAMESPACE_NO)
1760 arg_mount_settings |= MOUNT_USE_USERNS;
1761
1762 if (arg_private_network)
1763 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1764
1765 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1766 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
1767 arg_register = false;
1768 if (arg_start_mode != START_PID1)
1769 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--boot cannot be used without namespacing.");
1770 }
1771
1772 if (arg_userns_ownership < 0)
1773 arg_userns_ownership =
1774 arg_userns_mode == USER_NAMESPACE_PICK ? USER_NAMESPACE_OWNERSHIP_AUTO :
1775 USER_NAMESPACE_OWNERSHIP_OFF;
1776
1777 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
1778 arg_kill_signal = SIGRTMIN+3;
1779
1780 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 */
1781 arg_read_only = true;
1782
1783 if (has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts))
1784 arg_read_only = true;
1785
1786 if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0)
1787 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1788 * The latter is not technically a user session, but we don't need to labour the point. */
1789 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--keep-unit --register=yes may not be used when invoked from a user session.");
1790
1791 if (arg_directory && arg_image)
1792 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--directory= and --image= may not be combined.");
1793
1794 if (arg_template && arg_image)
1795 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= and --image= may not be combined.");
1796
1797 if (arg_template && !(arg_directory || arg_machine))
1798 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= needs --directory= or --machine=.");
1799
1800 if (arg_ephemeral && arg_template)
1801 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined.");
1802
1803 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO))
1804 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined.");
1805
1806 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported())
1807 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support.");
1808
1809 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_read_only)
1810 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1811 "--read-only and --private-users-ownership=chown may not be combined.");
1812
1813 /* We don't support --private-users-ownership=chown together with any of the volatile modes since we
1814 * couldn't change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a
1815 * massive copy-up (in case of overlay) making the entire exercise pointless. */
1816 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_volatile_mode != VOLATILE_NO)
1817 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--volatile= and --private-users-ownership=chown may not be combined.");
1818
1819 /* If --network-namespace-path is given with any other network-related option (except --private-network),
1820 * we need to error out, to avoid conflicts between different network options. */
1821 if (arg_network_namespace_path &&
1822 (arg_network_interfaces || arg_network_macvlan ||
1823 arg_network_ipvlan || arg_network_veth_extra ||
1824 arg_network_bridge || arg_network_zone ||
1825 arg_network_veth))
1826 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--network-namespace-path= cannot be combined with other network options.");
1827
1828 if (arg_network_bridge && arg_network_zone)
1829 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1830 "--network-bridge= and --network-zone= may not be combined.");
1831
1832 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network)
1833 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1834
1835 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO))
1836 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot combine --private-users with read-write mounts.");
1837
1838 if (arg_expose_ports && !arg_private_network)
1839 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot use --port= without private networking.");
1840
1841 if (arg_caps_ambient) {
1842 if (arg_caps_ambient == UINT64_MAX)
1843 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= does not support the value all.");
1844
1845 if ((arg_caps_ambient & arg_caps_retain) != arg_caps_ambient)
1846 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not fully covered by Capability= setting.");
1847
1848 if (arg_start_mode == START_BOOT)
1849 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not useful for boot mode.");
1850 }
1851
1852 if (arg_userns_mode == USER_NAMESPACE_NO && !strv_isempty(arg_bind_user))
1853 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--bind-user= requires --private-users");
1854
1855 /* Drop duplicate --bind-user= entries */
1856 strv_uniq(arg_bind_user);
1857
1858 r = custom_mount_check_all();
1859 if (r < 0)
1860 return r;
1861
1862 return 0;
1863 }
1864
1865 int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1866 assert(p);
1867
1868 if (arg_userns_mode == USER_NAMESPACE_NO)
1869 return 0;
1870
1871 if (uid == UID_INVALID && gid == GID_INVALID)
1872 return 0;
1873
1874 if (uid != UID_INVALID) {
1875 uid += arg_uid_shift;
1876
1877 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1878 return -EOVERFLOW;
1879 }
1880
1881 if (gid != GID_INVALID) {
1882 gid += (gid_t) arg_uid_shift;
1883
1884 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1885 return -EOVERFLOW;
1886 }
1887
1888 return RET_NERRNO(lchown(p, uid, gid));
1889 }
1890
1891 int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1892 const char *q;
1893 int r;
1894
1895 q = prefix_roota(root, path);
1896 r = RET_NERRNO(mkdir(q, mode));
1897 if (r == -EEXIST)
1898 return 0;
1899 if (r < 0)
1900 return r;
1901
1902 return userns_lchown(q, uid, gid);
1903 }
1904
1905 static const char *timezone_from_path(const char *path) {
1906 return PATH_STARTSWITH_SET(
1907 path,
1908 "../usr/share/zoneinfo/",
1909 "/usr/share/zoneinfo/");
1910 }
1911
1912 static bool etc_writable(void) {
1913 return !arg_read_only || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY);
1914 }
1915
1916 static int setup_timezone(const char *dest) {
1917 _cleanup_free_ char *p = NULL, *etc = NULL;
1918 const char *where, *check;
1919 TimezoneMode m;
1920 int r;
1921
1922 assert(dest);
1923
1924 if (IN_SET(arg_timezone, TIMEZONE_AUTO, TIMEZONE_SYMLINK)) {
1925 r = readlink_malloc("/etc/localtime", &p);
1926 if (r == -ENOENT && arg_timezone == TIMEZONE_AUTO)
1927 m = etc_writable() ? TIMEZONE_DELETE : TIMEZONE_OFF;
1928 else if (r == -EINVAL && arg_timezone == TIMEZONE_AUTO) /* regular file? */
1929 m = etc_writable() ? TIMEZONE_COPY : TIMEZONE_BIND;
1930 else if (r < 0) {
1931 log_warning_errno(r, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1932 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1933 * file.
1934 *
1935 * Example:
1936 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1937 */
1938 return 0;
1939 } else if (arg_timezone == TIMEZONE_AUTO)
1940 m = etc_writable() ? TIMEZONE_SYMLINK : TIMEZONE_BIND;
1941 else
1942 m = arg_timezone;
1943 } else
1944 m = arg_timezone;
1945
1946 if (m == TIMEZONE_OFF)
1947 return 0;
1948
1949 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
1950 if (r < 0) {
1951 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
1952 return 0;
1953 }
1954
1955 where = strjoina(etc, "/localtime");
1956
1957 switch (m) {
1958
1959 case TIMEZONE_DELETE:
1960 if (unlink(where) < 0)
1961 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
1962
1963 return 0;
1964
1965 case TIMEZONE_SYMLINK: {
1966 _cleanup_free_ char *q = NULL;
1967 const char *z, *what;
1968
1969 z = timezone_from_path(p);
1970 if (!z) {
1971 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1972 return 0;
1973 }
1974
1975 r = readlink_malloc(where, &q);
1976 if (r >= 0 && streq_ptr(timezone_from_path(q), z))
1977 return 0; /* Already pointing to the right place? Then do nothing .. */
1978
1979 check = strjoina(dest, "/usr/share/zoneinfo/", z);
1980 r = chase_symlinks(check, dest, 0, NULL, NULL);
1981 if (r < 0)
1982 log_debug_errno(r, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z);
1983 else {
1984 if (unlink(where) < 0 && errno != ENOENT) {
1985 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1986 errno, "Failed to remove existing timezone info %s in container, ignoring: %m", where);
1987 return 0;
1988 }
1989
1990 what = strjoina("../usr/share/zoneinfo/", z);
1991 if (symlink(what, where) < 0) {
1992 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1993 errno, "Failed to correct timezone of container, ignoring: %m");
1994 return 0;
1995 }
1996
1997 break;
1998 }
1999
2000 _fallthrough_;
2001 }
2002
2003 case TIMEZONE_BIND: {
2004 _cleanup_free_ char *resolved = NULL;
2005 int found;
2006
2007 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
2008 if (found < 0) {
2009 log_warning_errno(found, "Failed to resolve /etc/localtime path in container, ignoring: %m");
2010 return 0;
2011 }
2012
2013 if (found == 0) /* missing? */
2014 (void) touch(resolved);
2015
2016 r = mount_nofollow_verbose(LOG_WARNING, "/etc/localtime", resolved, NULL, MS_BIND, NULL);
2017 if (r >= 0)
2018 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
2019
2020 _fallthrough_;
2021 }
2022
2023 case TIMEZONE_COPY:
2024 /* If mounting failed, try to copy */
2025 r = copy_file_atomic("/etc/localtime", where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
2026 if (r < 0) {
2027 log_full_errno(IN_SET(r, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
2028 "Failed to copy /etc/localtime to %s, ignoring: %m", where);
2029 return 0;
2030 }
2031
2032 break;
2033
2034 default:
2035 assert_not_reached();
2036 }
2037
2038 /* Fix permissions of the symlink or file copy we just created */
2039 r = userns_lchown(where, 0, 0);
2040 if (r < 0)
2041 log_warning_errno(r, "Failed to chown /etc/localtime, ignoring: %m");
2042
2043 return 0;
2044 }
2045
2046 static int have_resolv_conf(const char *path) {
2047 assert(path);
2048
2049 if (access(path, F_OK) < 0) {
2050 if (errno == ENOENT)
2051 return 0;
2052
2053 return log_debug_errno(errno, "Failed to determine whether '%s' is available: %m", path);
2054 }
2055
2056 return 1;
2057 }
2058
2059 static int resolved_listening(void) {
2060 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2061 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
2062 _cleanup_free_ char *dns_stub_listener_mode = NULL;
2063 int r;
2064
2065 /* Check if resolved is listening */
2066
2067 r = sd_bus_open_system(&bus);
2068 if (r < 0)
2069 return log_debug_errno(r, "Failed to open system bus: %m");
2070
2071 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
2072 if (r < 0)
2073 return log_debug_errno(r, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
2074 if (r == 0)
2075 return 0;
2076
2077 r = sd_bus_get_property_string(bus,
2078 "org.freedesktop.resolve1",
2079 "/org/freedesktop/resolve1",
2080 "org.freedesktop.resolve1.Manager",
2081 "DNSStubListener",
2082 &error,
2083 &dns_stub_listener_mode);
2084 if (r < 0)
2085 return log_debug_errno(r, "Failed to query DNSStubListener property: %s", bus_error_message(&error, r));
2086
2087 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
2088 }
2089
2090 static int setup_resolv_conf(const char *dest) {
2091 _cleanup_free_ char *etc = NULL;
2092 const char *where, *what;
2093 ResolvConfMode m;
2094 int r;
2095
2096 assert(dest);
2097
2098 if (arg_resolv_conf == RESOLV_CONF_AUTO) {
2099 if (arg_private_network)
2100 m = RESOLV_CONF_OFF;
2101 else if (have_resolv_conf(PRIVATE_STUB_RESOLV_CONF) > 0 && resolved_listening() > 0)
2102 m = etc_writable() ? RESOLV_CONF_COPY_STUB : RESOLV_CONF_BIND_STUB;
2103 else if (have_resolv_conf("/etc/resolv.conf") > 0)
2104 m = etc_writable() ? RESOLV_CONF_COPY_HOST : RESOLV_CONF_BIND_HOST;
2105 else
2106 m = etc_writable() ? RESOLV_CONF_DELETE : RESOLV_CONF_OFF;
2107
2108 } else
2109 m = arg_resolv_conf;
2110
2111 if (m == RESOLV_CONF_OFF)
2112 return 0;
2113
2114 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
2115 if (r < 0) {
2116 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
2117 return 0;
2118 }
2119
2120 where = strjoina(etc, "/resolv.conf");
2121
2122 if (m == RESOLV_CONF_DELETE) {
2123 if (unlink(where) < 0)
2124 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
2125
2126 return 0;
2127 }
2128
2129 if (IN_SET(m, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_COPY_STATIC))
2130 what = PRIVATE_STATIC_RESOLV_CONF;
2131 else if (IN_SET(m, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_COPY_UPLINK))
2132 what = PRIVATE_UPLINK_RESOLV_CONF;
2133 else if (IN_SET(m, RESOLV_CONF_BIND_STUB, RESOLV_CONF_REPLACE_STUB, RESOLV_CONF_COPY_STUB))
2134 what = PRIVATE_STUB_RESOLV_CONF;
2135 else
2136 what = "/etc/resolv.conf";
2137
2138 if (IN_SET(m, RESOLV_CONF_BIND_HOST, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_BIND_STUB)) {
2139 _cleanup_free_ char *resolved = NULL;
2140 int found;
2141
2142 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
2143 if (found < 0) {
2144 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
2145 return 0;
2146 }
2147
2148 if (found == 0) /* missing? */
2149 (void) touch(resolved);
2150
2151 r = mount_nofollow_verbose(LOG_WARNING, what, resolved, NULL, MS_BIND, NULL);
2152 if (r >= 0)
2153 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
2154
2155 /* If that didn't work, let's copy the file */
2156 }
2157
2158 if (IN_SET(m, RESOLV_CONF_REPLACE_HOST, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_REPLACE_STUB))
2159 r = copy_file_atomic(what, where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
2160 else
2161 r = copy_file(what, where, O_TRUNC|O_NOFOLLOW, 0644, 0, 0, COPY_REFLINK);
2162 if (r < 0) {
2163 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
2164 * resolved or something similar runs inside and the symlink points there.
2165 *
2166 * If the disk image is read-only, there's also no point in complaining.
2167 */
2168 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST, RESOLV_CONF_COPY_STATIC, RESOLV_CONF_COPY_UPLINK, RESOLV_CONF_COPY_STUB) &&
2169 IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
2170 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
2171 return 0;
2172 }
2173
2174 r = userns_lchown(where, 0, 0);
2175 if (r < 0)
2176 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
2177
2178 return 0;
2179 }
2180
2181 static int setup_boot_id(void) {
2182 _cleanup_(unlink_and_freep) char *from = NULL;
2183 _cleanup_free_ char *path = NULL;
2184 sd_id128_t rnd = SD_ID128_NULL;
2185 const char *to;
2186 int r;
2187
2188 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
2189
2190 r = tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path);
2191 if (r < 0)
2192 return log_error_errno(r, "Failed to generate random boot ID path: %m");
2193
2194 r = sd_id128_randomize(&rnd);
2195 if (r < 0)
2196 return log_error_errno(r, "Failed to generate random boot id: %m");
2197
2198 r = id128_write(path, ID128_UUID, rnd, false);
2199 if (r < 0)
2200 return log_error_errno(r, "Failed to write boot id: %m");
2201
2202 from = TAKE_PTR(path);
2203 to = "/proc/sys/kernel/random/boot_id";
2204
2205 r = mount_nofollow_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
2206 if (r < 0)
2207 return r;
2208
2209 return mount_nofollow_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
2210 }
2211
2212 static int copy_devnodes(const char *dest) {
2213 static const char devnodes[] =
2214 "null\0"
2215 "zero\0"
2216 "full\0"
2217 "random\0"
2218 "urandom\0"
2219 "tty\0"
2220 "net/tun\0";
2221
2222 int r = 0;
2223
2224 assert(dest);
2225
2226 BLOCK_WITH_UMASK(0000);
2227
2228 /* Create /dev/net, so that we can create /dev/net/tun in it */
2229 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
2230 return log_error_errno(r, "Failed to create /dev/net directory: %m");
2231
2232 NULSTR_FOREACH(d, devnodes) {
2233 _cleanup_free_ char *from = NULL, *to = NULL;
2234 struct stat st;
2235
2236 from = path_join("/dev/", d);
2237 if (!from)
2238 return log_oom();
2239
2240 to = path_join(dest, from);
2241 if (!to)
2242 return log_oom();
2243
2244 if (stat(from, &st) < 0) {
2245
2246 if (errno != ENOENT)
2247 return log_error_errno(errno, "Failed to stat %s: %m", from);
2248
2249 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode))
2250 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2251 "%s is not a char or block device, cannot copy.", from);
2252 else {
2253 _cleanup_free_ char *sl = NULL, *prefixed = NULL, *dn = NULL, *t = NULL;
2254
2255 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
2256 /* Explicitly warn the user when /dev is already populated. */
2257 if (errno == EEXIST)
2258 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);
2259 if (errno != EPERM)
2260 return log_error_errno(errno, "mknod(%s) failed: %m", to);
2261
2262 /* Some systems abusively restrict mknod but allow bind mounts. */
2263 r = touch(to);
2264 if (r < 0)
2265 return log_error_errno(r, "touch (%s) failed: %m", to);
2266 r = mount_nofollow_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
2267 if (r < 0)
2268 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
2269 }
2270
2271 r = userns_lchown(to, 0, 0);
2272 if (r < 0)
2273 return log_error_errno(r, "chown() of device node %s failed: %m", to);
2274
2275 dn = path_join("/dev", S_ISCHR(st.st_mode) ? "char" : "block");
2276 if (!dn)
2277 return log_oom();
2278
2279 r = userns_mkdir(dest, dn, 0755, 0, 0);
2280 if (r < 0)
2281 return log_error_errno(r, "Failed to create '%s': %m", dn);
2282
2283 if (asprintf(&sl, "%s/%u:%u", dn, major(st.st_rdev), minor(st.st_rdev)) < 0)
2284 return log_oom();
2285
2286 prefixed = path_join(dest, sl);
2287 if (!prefixed)
2288 return log_oom();
2289
2290 t = path_join("..", d);
2291 if (!t)
2292 return log_oom();
2293
2294 if (symlink(t, prefixed) < 0)
2295 log_debug_errno(errno, "Failed to symlink '%s' to '%s': %m", t, prefixed);
2296 }
2297 }
2298
2299 return r;
2300 }
2301
2302 static int make_extra_nodes(const char *dest) {
2303 size_t i;
2304 int r;
2305
2306 BLOCK_WITH_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
2312 path = path_join(dest, n->path);
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
2327 static int setup_pts(const char *dest) {
2328 _cleanup_free_ char *options = NULL;
2329 const char *p;
2330 int r;
2331
2332 #if HAVE_SELINUX
2333 if (arg_selinux_apifs_context)
2334 (void) asprintf(&options,
2335 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
2336 arg_uid_shift + TTY_GID,
2337 arg_selinux_apifs_context);
2338 else
2339 #endif
2340 (void) asprintf(&options,
2341 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
2342 arg_uid_shift + TTY_GID);
2343
2344 if (!options)
2345 return log_oom();
2346
2347 /* Mount /dev/pts itself */
2348 p = prefix_roota(dest, "/dev/pts");
2349 r = RET_NERRNO(mkdir(p, 0755));
2350 if (r < 0)
2351 return log_error_errno(r, "Failed to create /dev/pts: %m");
2352
2353 r = mount_nofollow_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
2354 if (r < 0)
2355 return r;
2356 r = userns_lchown(p, 0, 0);
2357 if (r < 0)
2358 return log_error_errno(r, "Failed to chown /dev/pts: %m");
2359
2360 /* Create /dev/ptmx symlink */
2361 p = prefix_roota(dest, "/dev/ptmx");
2362 if (symlink("pts/ptmx", p) < 0)
2363 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
2364 r = userns_lchown(p, 0, 0);
2365 if (r < 0)
2366 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
2367
2368 /* And fix /dev/pts/ptmx ownership */
2369 p = prefix_roota(dest, "/dev/pts/ptmx");
2370 r = userns_lchown(p, 0, 0);
2371 if (r < 0)
2372 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
2373
2374 return 0;
2375 }
2376
2377 static int setup_stdio_as_dev_console(void) {
2378 _cleanup_close_ int terminal = -1;
2379 int r;
2380
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);
2384 if (terminal < 0)
2385 return log_error_errno(terminal, "Failed to open console: %m");
2386
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");
2392
2393 /* invalidates 'terminal' on success and failure */
2394 r = rearrange_stdio(terminal, terminal, terminal);
2395 TAKE_FD(terminal);
2396 if (r < 0)
2397 return log_error_errno(r, "Failed to move console to stdin/stdout/stderr: %m");
2398
2399 return 0;
2400 }
2401
2402 static int setup_dev_console(const char *console) {
2403 _cleanup_free_ char *p = NULL;
2404 int r;
2405
2406 /* Create /dev/console symlink */
2407 r = path_make_relative("/dev", console, &p);
2408 if (r < 0)
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");
2413
2414 return 0;
2415 }
2416
2417 static int setup_keyring(void) {
2418 key_serial_t keyring;
2419
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. */
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.");
2430 else if (ERRNO_IS_PRIVILEGE(errno))
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
2439 static 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");
2455 r = mount_nofollow_verbose(LOG_ERR, NULL, q, "ramfs", MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0700");
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 */
2492 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
2493 if (r < 0)
2494 return r;
2495
2496 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0500");
2497 }
2498
2499 static int setup_kmsg(int kmsg_socket) {
2500 _cleanup_(unlink_and_freep) char *from = NULL;
2501 _cleanup_free_ char *fifo = NULL;
2502 _cleanup_close_ int fd = -1;
2503 int r;
2504
2505 assert(kmsg_socket >= 0);
2506
2507 BLOCK_WITH_UMASK(0000);
2508
2509 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
2510 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2511 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2512 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2513
2514 r = tempfn_random_child("/run", "proc-kmsg", &fifo);
2515 if (r < 0)
2516 return log_error_errno(r, "Failed to generate kmsg path: %m");
2517
2518 if (mkfifo(fifo, 0600) < 0)
2519 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
2520
2521 from = TAKE_PTR(fifo);
2522
2523 r = mount_nofollow_verbose(LOG_ERR, from, "/proc/kmsg", NULL, MS_BIND, NULL);
2524 if (r < 0)
2525 return r;
2526
2527 fd = open(from, O_RDWR|O_NONBLOCK|O_CLOEXEC);
2528 if (fd < 0)
2529 return log_error_errno(errno, "Failed to open fifo: %m");
2530
2531 /* Store away the fd in the socket, so that it stays open as long as we run the child */
2532 r = send_one_fd(kmsg_socket, fd, 0);
2533 if (r < 0)
2534 return log_error_errno(r, "Failed to send FIFO fd: %m");
2535
2536 return 0;
2537 }
2538
2539 struct ExposeArgs {
2540 union in_addr_union address4;
2541 union in_addr_union address6;
2542 struct FirewallContext *fw_ctx;
2543 };
2544
2545 static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2546 struct ExposeArgs *args = ASSERT_PTR(userdata);
2547
2548 assert(rtnl);
2549 assert(m);
2550
2551 (void) expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET, &args->address4);
2552 (void) expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET6, &args->address6);
2553 return 0;
2554 }
2555
2556 static int setup_hostname(void) {
2557 int r;
2558
2559 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
2560 return 0;
2561
2562 r = sethostname_idempotent(arg_hostname ?: arg_machine);
2563 if (r < 0)
2564 return log_error_errno(r, "Failed to set hostname: %m");
2565
2566 return 0;
2567 }
2568
2569 static int setup_journal(const char *directory) {
2570 _cleanup_free_ char *d = NULL;
2571 const char *p, *q;
2572 sd_id128_t this_id;
2573 bool try;
2574 int r;
2575
2576 /* Don't link journals in ephemeral mode */
2577 if (arg_ephemeral)
2578 return 0;
2579
2580 if (arg_link_journal == LINK_NO)
2581 return 0;
2582
2583 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
2584
2585 r = sd_id128_get_machine(&this_id);
2586 if (r < 0)
2587 return log_error_errno(r, "Failed to retrieve machine ID: %m");
2588
2589 if (sd_id128_equal(arg_uuid, this_id)) {
2590 log_full(try ? LOG_WARNING : LOG_ERR,
2591 "Host and machine ids are equal (%s): refusing to link journals", SD_ID128_TO_STRING(arg_uuid));
2592 if (try)
2593 return 0;
2594 return -EEXIST;
2595 }
2596
2597 FOREACH_STRING(dirname, "/var", "/var/log", "/var/log/journal") {
2598 r = userns_mkdir(directory, dirname, 0755, 0, 0);
2599 if (r < 0) {
2600 bool ignore = r == -EROFS && try;
2601 log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
2602 "Failed to create %s%s: %m", dirname, ignore ? ", ignoring" : "");
2603 return ignore ? 0 : r;
2604 }
2605 }
2606
2607 p = strjoina("/var/log/journal/", SD_ID128_TO_STRING(arg_uuid));
2608 q = prefix_roota(directory, p);
2609
2610 if (path_is_mount_point(p, NULL, 0) > 0) {
2611 if (try)
2612 return 0;
2613
2614 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2615 "%s: already a mount point, refusing to use for journal", p);
2616 }
2617
2618 if (path_is_mount_point(q, NULL, 0) > 0) {
2619 if (try)
2620 return 0;
2621
2622 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2623 "%s: already a mount point, refusing to use for journal", q);
2624 }
2625
2626 r = readlink_and_make_absolute(p, &d);
2627 if (r >= 0) {
2628 if (IN_SET(arg_link_journal, LINK_GUEST, LINK_AUTO) &&
2629 path_equal(d, q)) {
2630
2631 r = userns_mkdir(directory, p, 0755, 0, 0);
2632 if (r < 0)
2633 log_warning_errno(r, "Failed to create directory %s: %m", q);
2634 return 0;
2635 }
2636
2637 if (unlink(p) < 0)
2638 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
2639 } else if (r == -EINVAL) {
2640
2641 if (arg_link_journal == LINK_GUEST &&
2642 rmdir(p) < 0) {
2643
2644 if (errno == ENOTDIR) {
2645 log_error("%s already exists and is neither a symlink nor a directory", p);
2646 return r;
2647 } else
2648 return log_error_errno(errno, "Failed to remove %s: %m", p);
2649 }
2650 } else if (r != -ENOENT)
2651 return log_error_errno(r, "readlink(%s) failed: %m", p);
2652
2653 if (arg_link_journal == LINK_GUEST) {
2654
2655 if (symlink(q, p) < 0) {
2656 if (try) {
2657 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
2658 return 0;
2659 } else
2660 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
2661 }
2662
2663 r = userns_mkdir(directory, p, 0755, 0, 0);
2664 if (r < 0)
2665 log_warning_errno(r, "Failed to create directory %s: %m", q);
2666 return 0;
2667 }
2668
2669 if (arg_link_journal == LINK_HOST) {
2670 /* don't create parents here — if the host doesn't have
2671 * permanent journal set up, don't force it here */
2672
2673 r = RET_NERRNO(mkdir(p, 0755));
2674 if (r < 0 && r != -EEXIST) {
2675 if (try) {
2676 log_debug_errno(r, "Failed to create %s, skipping journal setup: %m", p);
2677 return 0;
2678 } else
2679 return log_error_errno(r, "Failed to create %s: %m", p);
2680 }
2681
2682 } else if (access(p, F_OK) < 0)
2683 return 0;
2684
2685 if (dir_is_empty(q, /* ignore_hidden_or_backup= */ false) == 0)
2686 log_warning("%s is not empty, proceeding anyway.", q);
2687
2688 r = userns_mkdir(directory, p, 0755, 0, 0);
2689 if (r < 0)
2690 return log_error_errno(r, "Failed to create %s: %m", q);
2691
2692 r = mount_nofollow_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
2693 if (r < 0)
2694 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
2695
2696 return 0;
2697 }
2698
2699 static int drop_capabilities(uid_t uid) {
2700 CapabilityQuintet q;
2701
2702 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2703 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2704 * arg_caps_retain. */
2705
2706 if (capability_quintet_is_set(&arg_full_capabilities)) {
2707 q = arg_full_capabilities;
2708
2709 if (q.bounding == UINT64_MAX)
2710 q.bounding = uid == 0 ? arg_caps_retain : 0;
2711
2712 if (q.effective == UINT64_MAX)
2713 q.effective = uid == 0 ? q.bounding : 0;
2714
2715 if (q.inheritable == UINT64_MAX)
2716 q.inheritable = uid == 0 ? q.bounding : arg_caps_ambient;
2717
2718 if (q.permitted == UINT64_MAX)
2719 q.permitted = uid == 0 ? q.bounding : arg_caps_ambient;
2720
2721 if (q.ambient == UINT64_MAX && ambient_capabilities_supported())
2722 q.ambient = arg_caps_ambient;
2723
2724 if (capability_quintet_mangle(&q))
2725 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Cannot set capabilities that are not in the current bounding set.");
2726
2727 } else {
2728 q = (CapabilityQuintet) {
2729 .bounding = arg_caps_retain,
2730 .effective = uid == 0 ? arg_caps_retain : 0,
2731 .inheritable = uid == 0 ? arg_caps_retain : arg_caps_ambient,
2732 .permitted = uid == 0 ? arg_caps_retain : arg_caps_ambient,
2733 .ambient = ambient_capabilities_supported() ? arg_caps_ambient : UINT64_MAX,
2734 };
2735
2736 /* If we're not using OCI, proceed with mangled capabilities (so we don't error out)
2737 * in order to maintain the same behavior as systemd < 242. */
2738 if (capability_quintet_mangle(&q))
2739 log_full(arg_quiet ? LOG_DEBUG : LOG_WARNING,
2740 "Some capabilities will not be set because they are not in the current bounding set.");
2741
2742 }
2743
2744 return capability_quintet_enforce(&q);
2745 }
2746
2747 static int reset_audit_loginuid(void) {
2748 _cleanup_free_ char *p = NULL;
2749 int r;
2750
2751 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
2752 return 0;
2753
2754 r = read_one_line_file("/proc/self/loginuid", &p);
2755 if (r == -ENOENT)
2756 return 0;
2757 if (r < 0)
2758 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
2759
2760 /* Already reset? */
2761 if (streq(p, "4294967295"))
2762 return 0;
2763
2764 r = write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER);
2765 if (r < 0) {
2766 log_error_errno(r,
2767 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2768 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2769 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2770 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2771 "using systemd-nspawn. Sleeping for 5s... (%m)");
2772
2773 sleep(5);
2774 }
2775
2776 return 0;
2777 }
2778
2779 static int setup_propagate(const char *root) {
2780 const char *p, *q;
2781 int r;
2782
2783 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2784 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
2785 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
2786 (void) mkdir_p(p, 0600);
2787
2788 r = userns_mkdir(root, "/run/host", 0755, 0, 0);
2789 if (r < 0)
2790 return log_error_errno(r, "Failed to create /run/host: %m");
2791
2792 r = userns_mkdir(root, "/run/host/incoming", 0600, 0, 0);
2793 if (r < 0)
2794 return log_error_errno(r, "Failed to create /run/host/incoming: %m");
2795
2796 q = prefix_roota(root, "/run/host/incoming");
2797 r = mount_nofollow_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
2798 if (r < 0)
2799 return r;
2800
2801 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
2802 if (r < 0)
2803 return r;
2804
2805 /* machined will MS_MOVE into that directory, and that's only supported for non-shared mounts. */
2806 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
2807 }
2808
2809 static int setup_machine_id(const char *directory) {
2810 const char *etc_machine_id;
2811 sd_id128_t id;
2812 int r;
2813
2814 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2815 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2816 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2817 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2818 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2819 * container behaves nicely). */
2820
2821 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
2822
2823 r = id128_read(etc_machine_id, ID128_PLAIN_OR_UNINIT, &id);
2824 if (r < 0) {
2825 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
2826 return log_error_errno(r, "Failed to read machine ID from container image: %m");
2827
2828 if (sd_id128_is_null(arg_uuid)) {
2829 r = sd_id128_randomize(&arg_uuid);
2830 if (r < 0)
2831 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
2832 }
2833 } else {
2834 if (sd_id128_is_null(id))
2835 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2836 "Machine ID in container image is zero, refusing.");
2837
2838 arg_uuid = id;
2839 }
2840
2841 return 0;
2842 }
2843
2844 static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
2845 int r;
2846
2847 assert(directory);
2848
2849 if (arg_userns_mode == USER_NAMESPACE_NO || arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_CHOWN)
2850 return 0;
2851
2852 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
2853 if (r == -EOPNOTSUPP)
2854 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.");
2855 if (r == -EBADE)
2856 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
2857 if (r < 0)
2858 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
2859 if (r == 0)
2860 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2861 else
2862 log_debug("Patched directory tree to match UID/GID range.");
2863
2864 return r;
2865 }
2866
2867 /*
2868 * Return values:
2869 * < 0 : wait_for_terminate() failed to get the state of the
2870 * container, the container was terminated by a signal, or
2871 * failed for an unknown reason. No change is made to the
2872 * container argument.
2873 * > 0 : The program executed in the container terminated with an
2874 * error. The exit code of the program executed in the
2875 * container is returned. The container argument has been set
2876 * to CONTAINER_TERMINATED.
2877 * 0 : The container is being rebooted, has been shut down or exited
2878 * successfully. The container argument has been set to either
2879 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
2880 *
2881 * That is, success is indicated by a return value of zero, and an
2882 * error is indicated by a non-zero value.
2883 */
2884 static int wait_for_container(pid_t pid, ContainerStatus *container) {
2885 siginfo_t status;
2886 int r;
2887
2888 r = wait_for_terminate(pid, &status);
2889 if (r < 0)
2890 return log_warning_errno(r, "Failed to wait for container: %m");
2891
2892 switch (status.si_code) {
2893
2894 case CLD_EXITED:
2895 if (status.si_status == 0)
2896 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
2897 else
2898 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
2899
2900 *container = CONTAINER_TERMINATED;
2901 return status.si_status;
2902
2903 case CLD_KILLED:
2904 if (status.si_status == SIGINT) {
2905 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
2906 *container = CONTAINER_TERMINATED;
2907 return 0;
2908
2909 } else if (status.si_status == SIGHUP) {
2910 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
2911 *container = CONTAINER_REBOOTED;
2912 return 0;
2913 }
2914
2915 _fallthrough_;
2916 case CLD_DUMPED:
2917 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2918 "Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
2919
2920 default:
2921 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2922 "Container %s failed due to unknown reason.", arg_machine);
2923 }
2924 }
2925
2926 static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
2927 pid_t pid;
2928
2929 pid = PTR_TO_PID(userdata);
2930 if (pid > 0) {
2931 if (kill(pid, arg_kill_signal) >= 0) {
2932 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2933 sd_event_source_set_userdata(s, NULL);
2934 return 0;
2935 }
2936 }
2937
2938 sd_event_exit(sd_event_source_get_event(s), 0);
2939 return 0;
2940 }
2941
2942 static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
2943 pid_t pid;
2944
2945 assert(s);
2946 assert(ssi);
2947
2948 pid = PTR_TO_PID(userdata);
2949
2950 for (;;) {
2951 siginfo_t si = {};
2952
2953 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
2954 return log_error_errno(errno, "Failed to waitid(): %m");
2955 if (si.si_pid == 0) /* No pending children. */
2956 break;
2957 if (si.si_pid == pid) {
2958 /* The main process we care for has exited. Return from
2959 * signal handler but leave the zombie. */
2960 sd_event_exit(sd_event_source_get_event(s), 0);
2961 break;
2962 }
2963
2964 /* Reap all other children. */
2965 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2966 }
2967
2968 return 0;
2969 }
2970
2971 static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *error) {
2972 pid_t pid;
2973
2974 assert(m);
2975
2976 pid = PTR_TO_PID(userdata);
2977
2978 if (arg_kill_signal > 0) {
2979 log_info("Container termination requested. Attempting to halt container.");
2980 (void) kill(pid, arg_kill_signal);
2981 } else {
2982 log_info("Container termination requested. Exiting.");
2983 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m)), 0);
2984 }
2985
2986 return 0;
2987 }
2988
2989 static int determine_names(void) {
2990 int r;
2991
2992 if (arg_template && !arg_directory && arg_machine) {
2993
2994 /* If --template= was specified then we should not
2995 * search for a machine, but instead create a new one
2996 * in /var/lib/machine. */
2997
2998 arg_directory = path_join("/var/lib/machines", arg_machine);
2999 if (!arg_directory)
3000 return log_oom();
3001 }
3002
3003 if (!arg_image && !arg_directory) {
3004 if (arg_machine) {
3005 _cleanup_(image_unrefp) Image *i = NULL;
3006
3007 r = image_find(IMAGE_MACHINE, arg_machine, NULL, &i);
3008 if (r == -ENOENT)
3009 return log_error_errno(r, "No image for machine '%s'.", arg_machine);
3010 if (r < 0)
3011 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
3012
3013 if (IN_SET(i->type, IMAGE_RAW, IMAGE_BLOCK))
3014 r = free_and_strdup(&arg_image, i->path);
3015 else
3016 r = free_and_strdup(&arg_directory, i->path);
3017 if (r < 0)
3018 return log_oom();
3019
3020 if (!arg_ephemeral)
3021 arg_read_only = arg_read_only || i->read_only;
3022 } else {
3023 r = safe_getcwd(&arg_directory);
3024 if (r < 0)
3025 return log_error_errno(r, "Failed to determine current directory: %m");
3026 }
3027
3028 if (!arg_directory && !arg_image)
3029 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine path, please use -D or -i.");
3030 }
3031
3032 if (!arg_machine) {
3033 if (arg_directory && path_equal(arg_directory, "/"))
3034 arg_machine = gethostname_malloc();
3035 else if (arg_image) {
3036 char *e;
3037
3038 arg_machine = strdup(basename(arg_image));
3039
3040 /* Truncate suffix if there is one */
3041 e = endswith(arg_machine, ".raw");
3042 if (e)
3043 *e = 0;
3044 } else
3045 arg_machine = strdup(basename(arg_directory));
3046 if (!arg_machine)
3047 return log_oom();
3048
3049 hostname_cleanup(arg_machine);
3050 if (!hostname_is_valid(arg_machine, 0))
3051 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine machine name automatically, please use -M.");
3052
3053 /* Copy the machine name before the random suffix is added below, otherwise we won't be able
3054 * to match fixed config file names. */
3055 arg_settings_filename = strjoin(arg_machine, ".nspawn");
3056 if (!arg_settings_filename)
3057 return log_oom();
3058
3059 /* Add a random suffix when this is an ephemeral machine, so that we can run many
3060 * instances at once without manually having to specify -M each time. */
3061 if (arg_ephemeral)
3062 if (strextendf(&arg_machine, "-%016" PRIx64, random_u64()) < 0)
3063 return log_oom();
3064 } else {
3065 arg_settings_filename = strjoin(arg_machine, ".nspawn");
3066 if (!arg_settings_filename)
3067 return log_oom();
3068 }
3069
3070 return 0;
3071 }
3072
3073 static int chase_symlinks_and_update(char **p, unsigned flags) {
3074 char *chased;
3075 int r;
3076
3077 assert(p);
3078
3079 if (!*p)
3080 return 0;
3081
3082 r = chase_symlinks(*p, NULL, flags, &chased, NULL);
3083 if (r < 0)
3084 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
3085
3086 return free_and_replace(*p, chased);
3087 }
3088
3089 static int determine_uid_shift(const char *directory) {
3090
3091 if (arg_userns_mode == USER_NAMESPACE_NO) {
3092 arg_uid_shift = 0;
3093 return 0;
3094 }
3095
3096 if (arg_uid_shift == UID_INVALID) {
3097 struct stat st;
3098
3099 /* Read the UID shift off the image. Maybe we can reuse this to avoid chowning. */
3100
3101 if (stat(directory, &st) < 0)
3102 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
3103
3104 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
3105
3106 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000)))
3107 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3108 "UID and GID base of %s don't match.", directory);
3109
3110 arg_uid_range = UINT32_C(0x10000);
3111
3112 if (arg_uid_shift != 0) {
3113 /* If the image is shifted already, then we'll fall back to classic chowning, for
3114 * compatibility (and simplicity), or refuse if mapping is explicitly requested. */
3115
3116 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_AUTO) {
3117 log_debug("UID base of %s is non-zero, not using UID mapping.", directory);
3118 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3119 } else if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_MAP)
3120 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3121 "UID base of %s is not zero, UID mapping not supported.", directory);
3122 }
3123 }
3124
3125 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
3126 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID base too high for UID range.");
3127
3128 return 0;
3129 }
3130
3131 static unsigned long effective_clone_ns_flags(void) {
3132 unsigned long flags = arg_clone_ns_flags;
3133
3134 if (arg_private_network)
3135 flags |= CLONE_NEWNET;
3136 if (arg_use_cgns)
3137 flags |= CLONE_NEWCGROUP;
3138 if (arg_userns_mode != USER_NAMESPACE_NO)
3139 flags |= CLONE_NEWUSER;
3140
3141 return flags;
3142 }
3143
3144 static int patch_sysctl(void) {
3145
3146 /* This table is inspired by runc's sysctl() function */
3147 static const struct {
3148 const char *key;
3149 bool prefix;
3150 unsigned long clone_flags;
3151 } safe_sysctl[] = {
3152 { "kernel.hostname", false, CLONE_NEWUTS },
3153 { "kernel.domainname", false, CLONE_NEWUTS },
3154 { "kernel.msgmax", false, CLONE_NEWIPC },
3155 { "kernel.msgmnb", false, CLONE_NEWIPC },
3156 { "kernel.msgmni", false, CLONE_NEWIPC },
3157 { "kernel.sem", false, CLONE_NEWIPC },
3158 { "kernel.shmall", false, CLONE_NEWIPC },
3159 { "kernel.shmmax", false, CLONE_NEWIPC },
3160 { "kernel.shmmni", false, CLONE_NEWIPC },
3161 { "fs.mqueue.", true, CLONE_NEWIPC },
3162 { "net.", true, CLONE_NEWNET },
3163 };
3164
3165 unsigned long flags;
3166 int r;
3167
3168 flags = effective_clone_ns_flags();
3169
3170 STRV_FOREACH_PAIR(k, v, arg_sysctl) {
3171 bool good = false;
3172 size_t i;
3173
3174 for (i = 0; i < ELEMENTSOF(safe_sysctl); i++) {
3175
3176 if (!FLAGS_SET(flags, safe_sysctl[i].clone_flags))
3177 continue;
3178
3179 if (safe_sysctl[i].prefix)
3180 good = startswith(*k, safe_sysctl[i].key);
3181 else
3182 good = streq(*k, safe_sysctl[i].key);
3183
3184 if (good)
3185 break;
3186 }
3187
3188 if (!good)
3189 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k);
3190
3191 r = sysctl_write(*k, *v);
3192 if (r < 0)
3193 return log_error_errno(r, "Failed to write sysctl '%s': %m", *k);
3194 }
3195
3196 return 0;
3197 }
3198
3199 static int inner_child(
3200 Barrier *barrier,
3201 const char *directory,
3202 bool secondary,
3203 int kmsg_socket,
3204 int rtnl_socket,
3205 int master_pty_socket,
3206 FDSet *fds,
3207 char **os_release_pairs) {
3208
3209 _cleanup_free_ char *home = NULL;
3210 size_t n_env = 1;
3211 char *envp[] = {
3212 (char*) "PATH=" DEFAULT_PATH_COMPAT,
3213 NULL, /* container */
3214 NULL, /* TERM */
3215 NULL, /* HOME */
3216 NULL, /* USER */
3217 NULL, /* LOGNAME */
3218 NULL, /* container_uuid */
3219 NULL, /* LISTEN_FDS */
3220 NULL, /* LISTEN_PID */
3221 NULL, /* NOTIFY_SOCKET */
3222 NULL, /* CREDENTIALS_DIRECTORY */
3223 NULL, /* LANG */
3224 NULL
3225 };
3226 const char *exec_target;
3227 _cleanup_strv_free_ char **env_use = NULL;
3228 int r, which_failed;
3229
3230 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
3231 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
3232 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
3233 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
3234 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
3235 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
3236 * namespace.
3237 *
3238 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
3239 * unshare(). See below. */
3240
3241 assert(barrier);
3242 assert(directory);
3243 assert(kmsg_socket >= 0);
3244
3245 log_debug("Inner child is initializing.");
3246
3247 if (arg_userns_mode != USER_NAMESPACE_NO) {
3248 /* Tell the parent, that it now can write the UID map. */
3249 (void) barrier_place(barrier); /* #1 */
3250
3251 /* Wait until the parent wrote the UID map */
3252 if (!barrier_place_and_sync(barrier)) /* #2 */
3253 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
3254
3255 /* Become the new root user inside our namespace */
3256 r = reset_uid_gid();
3257 if (r < 0)
3258 return log_error_errno(r, "Couldn't become new root: %m");
3259
3260 /* Creating a new user namespace means all MS_SHARED mounts become MS_SLAVE. Let's put them
3261 * back to MS_SHARED here, since that's what we want as defaults. (This will not reconnect
3262 * propagation, but simply create new peer groups for all our mounts). */
3263 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SHARED|MS_REC, NULL);
3264 if (r < 0)
3265 return r;
3266 }
3267
3268 r = mount_all(NULL,
3269 arg_mount_settings | MOUNT_IN_USERNS,
3270 arg_uid_shift,
3271 arg_selinux_apifs_context);
3272 if (r < 0)
3273 return r;
3274
3275 if (!arg_network_namespace_path && arg_private_network) {
3276 r = unshare(CLONE_NEWNET);
3277 if (r < 0)
3278 return log_error_errno(errno, "Failed to unshare network namespace: %m");
3279
3280 /* Tell the parent that it can setup network interfaces. */
3281 (void) barrier_place(barrier); /* #3 */
3282 }
3283
3284 r = mount_sysfs(NULL, arg_mount_settings);
3285 if (r < 0)
3286 return r;
3287
3288 /* Wait until we are cgroup-ified, so that we
3289 * can mount the right cgroup path writable */
3290 if (!barrier_place_and_sync(barrier)) /* #4 */
3291 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
3292 "Parent died too early");
3293
3294 if (arg_use_cgns) {
3295 r = unshare(CLONE_NEWCGROUP);
3296 if (r < 0)
3297 return log_error_errno(errno, "Failed to unshare cgroup namespace: %m");
3298 r = mount_cgroups(
3299 "",
3300 arg_unified_cgroup_hierarchy,
3301 arg_userns_mode != USER_NAMESPACE_NO,
3302 arg_uid_shift,
3303 arg_uid_range,
3304 arg_selinux_apifs_context,
3305 true);
3306 } else
3307 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
3308 if (r < 0)
3309 return r;
3310
3311 r = setup_boot_id();
3312 if (r < 0)
3313 return r;
3314
3315 r = setup_kmsg(kmsg_socket);
3316 if (r < 0)
3317 return r;
3318 kmsg_socket = safe_close(kmsg_socket);
3319
3320 r = mount_custom(
3321 "/",
3322 arg_custom_mounts,
3323 arg_n_custom_mounts,
3324 0,
3325 0,
3326 arg_selinux_apifs_context,
3327 MOUNT_NON_ROOT_ONLY | MOUNT_IN_USERNS);
3328 if (r < 0)
3329 return r;
3330
3331 if (setsid() < 0)
3332 return log_error_errno(errno, "setsid() failed: %m");
3333
3334 if (arg_private_network)
3335 (void) loopback_setup();
3336
3337 if (arg_expose_ports) {
3338 r = expose_port_send_rtnl(rtnl_socket);
3339 if (r < 0)
3340 return r;
3341 rtnl_socket = safe_close(rtnl_socket);
3342 }
3343
3344 if (arg_console_mode != CONSOLE_PIPE) {
3345 _cleanup_close_ int master = -1;
3346 _cleanup_free_ char *console = NULL;
3347
3348 /* Allocate a pty and make it available as /dev/console. */
3349 master = openpt_allocate(O_RDWR|O_NONBLOCK, &console);
3350 if (master < 0)
3351 return log_error_errno(master, "Failed to allocate a pty: %m");
3352
3353 r = setup_dev_console(console);
3354 if (r < 0)
3355 return log_error_errno(r, "Failed to set up /dev/console: %m");
3356
3357 r = send_one_fd(master_pty_socket, master, 0);
3358 if (r < 0)
3359 return log_error_errno(r, "Failed to send master fd: %m");
3360 master_pty_socket = safe_close(master_pty_socket);
3361
3362 r = setup_stdio_as_dev_console();
3363 if (r < 0)
3364 return r;
3365 }
3366
3367 r = patch_sysctl();
3368 if (r < 0)
3369 return r;
3370
3371 if (arg_oom_score_adjust_set) {
3372 r = set_oom_score_adjust(arg_oom_score_adjust);
3373 if (r < 0)
3374 return log_error_errno(r, "Failed to adjust OOM score: %m");
3375 }
3376
3377 if (arg_cpu_set.set)
3378 if (sched_setaffinity(0, arg_cpu_set.allocated, arg_cpu_set.set) < 0)
3379 return log_error_errno(errno, "Failed to set CPU affinity: %m");
3380
3381 (void) setup_hostname();
3382
3383 if (arg_personality != PERSONALITY_INVALID) {
3384 r = safe_personality(arg_personality);
3385 if (r < 0)
3386 return log_error_errno(r, "personality() failed: %m");
3387 } else if (secondary) {
3388 r = safe_personality(PER_LINUX32);
3389 if (r < 0)
3390 return log_error_errno(r, "personality() failed: %m");
3391 }
3392
3393 r = setrlimit_closest_all((const struct rlimit *const*) arg_rlimit, &which_failed);
3394 if (r < 0)
3395 return log_error_errno(r, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed));
3396
3397 #if HAVE_SECCOMP
3398 if (arg_seccomp) {
3399
3400 if (is_seccomp_available()) {
3401
3402 r = seccomp_load(arg_seccomp);
3403 if (ERRNO_IS_SECCOMP_FATAL(r))
3404 return log_error_errno(r, "Failed to install seccomp filter: %m");
3405 if (r < 0)
3406 log_debug_errno(r, "Failed to install seccomp filter: %m");
3407 }
3408 } else
3409 #endif
3410 {
3411 r = setup_seccomp(arg_caps_retain, arg_syscall_allow_list, arg_syscall_deny_list);
3412 if (r < 0)
3413 return r;
3414 }
3415
3416 if (arg_suppress_sync) {
3417 #if HAVE_SECCOMP
3418 r = seccomp_suppress_sync();
3419 if (r < 0)
3420 log_debug_errno(r, "Failed to install sync() suppression seccomp filter, ignoring: %m");
3421 #else
3422 log_debug("systemd is built without SECCOMP support. Ignoring --suppress-sync= command line option and SuppressSync= setting.");
3423 #endif
3424 }
3425
3426 #if HAVE_SELINUX
3427 if (arg_selinux_context)
3428 if (setexeccon(arg_selinux_context) < 0)
3429 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
3430 #endif
3431
3432 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3433 * if we need to later on. */
3434 if (prctl(PR_SET_KEEPCAPS, 1) < 0)
3435 return log_error_errno(errno, "Failed to set PR_SET_KEEPCAPS: %m");
3436
3437 if (uid_is_valid(arg_uid) || gid_is_valid(arg_gid))
3438 r = change_uid_gid_raw(arg_uid, arg_gid, arg_supplementary_gids, arg_n_supplementary_gids, arg_console_mode != CONSOLE_PIPE);
3439 else
3440 r = change_uid_gid(arg_user, arg_console_mode != CONSOLE_PIPE, &home);
3441 if (r < 0)
3442 return r;
3443
3444 r = drop_capabilities(getuid());
3445 if (r < 0)
3446 return log_error_errno(r, "Dropping capabilities failed: %m");
3447
3448 if (arg_no_new_privileges)
3449 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0)
3450 return log_error_errno(errno, "Failed to disable new privileges: %m");
3451
3452 /* LXC sets container=lxc, so follow the scheme here */
3453 envp[n_env++] = strjoina("container=", arg_container_service_name);
3454
3455 envp[n_env] = strv_find_prefix(environ, "TERM=");
3456 if (envp[n_env])
3457 n_env++;
3458
3459 if (home || !uid_is_valid(arg_uid) || arg_uid == 0)
3460 if (asprintf(envp + n_env++, "HOME=%s", home ?: "/root") < 0)
3461 return log_oom();
3462
3463 if (arg_user || !uid_is_valid(arg_uid) || arg_uid == 0)
3464 if (asprintf(envp + n_env++, "USER=%s", arg_user ?: "root") < 0 ||
3465 asprintf(envp + n_env++, "LOGNAME=%s", arg_user ? arg_user : "root") < 0)
3466 return log_oom();
3467
3468 assert(!sd_id128_is_null(arg_uuid));
3469
3470 if (asprintf(envp + n_env++, "container_uuid=%s", SD_ID128_TO_UUID_STRING(arg_uuid)) < 0)
3471 return log_oom();
3472
3473 if (fdset_size(fds) > 0) {
3474 r = fdset_cloexec(fds, false);
3475 if (r < 0)
3476 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
3477
3478 if ((asprintf(envp + n_env++, "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
3479 (asprintf(envp + n_env++, "LISTEN_PID=1") < 0))
3480 return log_oom();
3481 }
3482 if (asprintf(envp + n_env++, "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
3483 return log_oom();
3484
3485 if (arg_n_credentials > 0) {
3486 envp[n_env] = strdup("CREDENTIALS_DIRECTORY=/run/host/credentials");
3487 if (!envp[n_env])
3488 return log_oom();
3489 n_env++;
3490 }
3491
3492 if (arg_start_mode != START_BOOT) {
3493 envp[n_env] = strdup("LANG=" SYSTEMD_NSPAWN_LOCALE);
3494 if (!envp[n_env])
3495 return log_oom();
3496 n_env++;
3497 }
3498
3499 env_use = strv_env_merge(envp, os_release_pairs, arg_setenv);
3500 if (!env_use)
3501 return log_oom();
3502
3503 /* Let the parent know that we are ready and
3504 * wait until the parent is ready with the
3505 * setup, too... */
3506 if (!barrier_place_and_sync(barrier)) /* #5 */
3507 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
3508
3509 if (arg_chdir)
3510 if (chdir(arg_chdir) < 0)
3511 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
3512
3513 if (arg_start_mode == START_PID2) {
3514 r = stub_pid1(arg_uuid);
3515 if (r < 0)
3516 return r;
3517 }
3518
3519 if (arg_console_mode != CONSOLE_PIPE) {
3520 /* So far our pty wasn't controlled by any process. Finally, it's time to change that, if we
3521 * are configured for that. Acquire it as controlling tty. */
3522 if (ioctl(STDIN_FILENO, TIOCSCTTY) < 0)
3523 return log_error_errno(errno, "Failed to acquire controlling TTY: %m");
3524 }
3525
3526 log_debug("Inner child completed, invoking payload.");
3527
3528 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3529 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3530 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
3531 log_close();
3532 log_set_open_when_needed(true);
3533
3534 (void) fdset_close_others(fds);
3535
3536 if (arg_start_mode == START_BOOT) {
3537 char **a;
3538 size_t m;
3539
3540 /* Automatically search for the init system */
3541
3542 m = strv_length(arg_parameters);
3543 a = newa(char*, m + 2);
3544 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
3545 a[1 + m] = NULL;
3546
3547 FOREACH_STRING(init,
3548 "/usr/lib/systemd/systemd",
3549 "/lib/systemd/systemd",
3550 "/sbin/init") {
3551 a[0] = (char*) init;
3552 execve(a[0], a, env_use);
3553 }
3554
3555 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
3556 } else if (!strv_isempty(arg_parameters)) {
3557 const char *dollar_path;
3558
3559 exec_target = arg_parameters[0];
3560
3561 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3562 * binary. */
3563 dollar_path = strv_env_get(env_use, "PATH");
3564 if (dollar_path) {
3565 if (setenv("PATH", dollar_path, 1) < 0)
3566 return log_error_errno(errno, "Failed to update $PATH: %m");
3567 }
3568
3569 execvpe(arg_parameters[0], arg_parameters, env_use);
3570 } else {
3571 if (!arg_chdir)
3572 /* If we cannot change the directory, we'll end up in /, that is expected. */
3573 (void) chdir(home ?: "/root");
3574
3575 execle(DEFAULT_USER_SHELL, "-" DEFAULT_USER_SHELL_NAME, NULL, env_use);
3576 if (!streq(DEFAULT_USER_SHELL, "/bin/bash"))
3577 execle("/bin/bash", "-bash", NULL, env_use);
3578 if (!streq(DEFAULT_USER_SHELL, "/bin/sh"))
3579 execle("/bin/sh", "-sh", NULL, env_use);
3580
3581 exec_target = DEFAULT_USER_SHELL ", /bin/bash, /bin/sh";
3582 }
3583
3584 return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
3585 }
3586
3587 static int setup_notify_child(void) {
3588 _cleanup_close_ int fd = -1;
3589 static const union sockaddr_union sa = {
3590 .un.sun_family = AF_UNIX,
3591 .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH,
3592 };
3593 int r;
3594
3595 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3596 if (fd < 0)
3597 return log_error_errno(errno, "Failed to allocate notification socket: %m");
3598
3599 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
3600 (void) sockaddr_un_unlink(&sa.un);
3601
3602 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
3603 if (r < 0)
3604 return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
3605
3606 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
3607 if (r < 0)
3608 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
3609
3610 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
3611 if (r < 0)
3612 return log_error_errno(r, "SO_PASSCRED failed: %m");
3613
3614 return TAKE_FD(fd);
3615 }
3616
3617 static int outer_child(
3618 Barrier *barrier,
3619 const char *directory,
3620 DissectedImage *dissected_image,
3621 bool secondary,
3622 int pid_socket,
3623 int uuid_socket,
3624 int notify_socket,
3625 int kmsg_socket,
3626 int rtnl_socket,
3627 int uid_shift_socket,
3628 int master_pty_socket,
3629 int unified_cgroup_hierarchy_socket,
3630 FDSet *fds,
3631 int netns_fd) {
3632
3633 _cleanup_(bind_user_context_freep) BindUserContext *bind_user_context = NULL;
3634 _cleanup_strv_free_ char **os_release_pairs = NULL;
3635 _cleanup_close_ int fd = -1;
3636 bool idmap = false;
3637 const char *p;
3638 pid_t pid;
3639 ssize_t l;
3640 int r;
3641
3642 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It
3643 * already has its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in
3644 * the host's CLONE_NEWPID, CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET
3645 * namespaces. After it completed a number of initializations a second child (the "inner" one) is
3646 * forked off it, and it exits. */
3647
3648 assert(barrier);
3649 assert(directory);
3650 assert(pid_socket >= 0);
3651 assert(uuid_socket >= 0);
3652 assert(notify_socket >= 0);
3653 assert(master_pty_socket >= 0);
3654 assert(kmsg_socket >= 0);
3655
3656 log_debug("Outer child is initializing.");
3657
3658 r = load_os_release_pairs_with_prefix("/", "container_host_", &os_release_pairs);
3659 if (r < 0)
3660 log_debug_errno(r, "Failed to read os-release from host for container, ignoring: %m");
3661
3662 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
3663 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
3664
3665 r = reset_audit_loginuid();
3666 if (r < 0)
3667 return r;
3668
3669 /* Mark everything as slave, so that we still receive mounts from the real root, but don't propagate
3670 * mounts to the real root. */
3671 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
3672 if (r < 0)
3673 return r;
3674
3675 if (dissected_image) {
3676 /* If we are operating on a disk image, then mount its root directory now, but leave out the
3677 * rest. We can read the UID shift from it if we need to. Further down we'll mount the rest,
3678 * but then with the uid shift known. That way we can mount VFAT file systems shifted to the
3679 * right place right away. This makes sure ESP partitions and userns are compatible. */
3680
3681 r = dissected_image_mount_and_warn(
3682 dissected_image,
3683 directory,
3684 arg_uid_shift,
3685 arg_uid_range,
3686 DISSECT_IMAGE_MOUNT_ROOT_ONLY|
3687 DISSECT_IMAGE_DISCARD_ON_LOOP|
3688 DISSECT_IMAGE_USR_NO_ROOT|
3689 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
3690 (arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0));
3691 if (r < 0)
3692 return r;
3693 }
3694
3695 r = determine_uid_shift(directory);
3696 if (r < 0)
3697 return r;
3698
3699 if (arg_userns_mode != USER_NAMESPACE_NO) {
3700 /* Let the parent know which UID shift we read from the image */
3701 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
3702 if (l < 0)
3703 return log_error_errno(errno, "Failed to send UID shift: %m");
3704 if (l != sizeof(arg_uid_shift))
3705 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3706 "Short write while sending UID shift.");
3707
3708 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3709 /* When we are supposed to pick the UID shift, the parent will check now whether the
3710 * UID shift we just read from the image is available. If yes, it will send the UID
3711 * shift back to us, if not it will pick a different one, and send it back to us. */
3712
3713 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
3714 if (l < 0)
3715 return log_error_errno(errno, "Failed to recv UID shift: %m");
3716 if (l != sizeof(arg_uid_shift))
3717 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3718 "Short read while receiving UID shift.");
3719 }
3720
3721 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
3722 "Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
3723 }
3724
3725 if (path_equal(directory, "/")) {
3726 /* If the directory we shall boot is the host, let's operate on a bind mount at a different
3727 * place, so that we can make changes to its mount structure (for example, to implement
3728 * --volatile=) without this interfering with our ability to access files such as
3729 * /etc/localtime to copy into the container. Note that we use a fixed place for this
3730 * (instead of a temporary directory, since we are living in our own mount namspace here
3731 * already, and thus don't need to be afraid of colliding with anyone else's mounts). */
3732 (void) mkdir_p("/run/systemd/nspawn-root", 0755);
3733
3734 r = mount_nofollow_verbose(LOG_ERR, "/", "/run/systemd/nspawn-root", NULL, MS_BIND|MS_REC, NULL);
3735 if (r < 0)
3736 return r;
3737
3738 directory = "/run/systemd/nspawn-root";
3739 }
3740
3741 r = setup_pivot_root(
3742 directory,
3743 arg_pivot_root_new,
3744 arg_pivot_root_old);
3745 if (r < 0)
3746 return r;
3747
3748 r = setup_volatile_mode(
3749 directory,
3750 arg_volatile_mode,
3751 arg_uid_shift,
3752 arg_selinux_apifs_context);
3753 if (r < 0)
3754 return r;
3755
3756 r = bind_user_prepare(
3757 directory,
3758 arg_bind_user,
3759 arg_uid_shift,
3760 arg_uid_range,
3761 &arg_custom_mounts, &arg_n_custom_mounts,
3762 &bind_user_context);
3763 if (r < 0)
3764 return r;
3765
3766 if (arg_userns_mode != USER_NAMESPACE_NO && bind_user_context) {
3767 /* Send the user maps we determined to the parent, so that it installs it in our user
3768 * namespace UID map table */
3769
3770 for (size_t i = 0; i < bind_user_context->n_data; i++) {
3771 uid_t map[] = {
3772 bind_user_context->data[i].payload_user->uid,
3773 bind_user_context->data[i].host_user->uid,
3774 (uid_t) bind_user_context->data[i].payload_group->gid,
3775 (uid_t) bind_user_context->data[i].host_group->gid,
3776 };
3777
3778 l = send(uid_shift_socket, map, sizeof(map), MSG_NOSIGNAL);
3779 if (l < 0)
3780 return log_error_errno(errno, "Failed to send user UID map: %m");
3781 if (l != sizeof(map))
3782 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3783 "Short write while sending user UID map.");
3784 }
3785 }
3786
3787 r = mount_custom(
3788 directory,
3789 arg_custom_mounts,
3790 arg_n_custom_mounts,
3791 arg_uid_shift,
3792 arg_uid_range,
3793 arg_selinux_apifs_context,
3794 MOUNT_ROOT_ONLY);
3795 if (r < 0)
3796 return r;
3797
3798 /* Make sure we always have a mount that we can move to root later on. */
3799 r = make_mount_point(directory);
3800 if (r < 0)
3801 return r;
3802
3803 if (arg_userns_mode != USER_NAMESPACE_NO &&
3804 IN_SET(arg_userns_ownership, USER_NAMESPACE_OWNERSHIP_MAP, USER_NAMESPACE_OWNERSHIP_AUTO) &&
3805 arg_uid_shift != 0) {
3806
3807 r = remount_idmap(directory, arg_uid_shift, arg_uid_range, UID_INVALID, REMOUNT_IDMAPPING_HOST_ROOT);
3808 if (r == -EINVAL || ERRNO_IS_NOT_SUPPORTED(r)) {
3809 /* This might fail because the kernel or file system doesn't support idmapping. We
3810 * can't really distinguish this nicely, nor do we have any guarantees about the
3811 * error codes we see, could be EOPNOTSUPP or EINVAL. */
3812 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_AUTO)
3813 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3814 "ID mapped mounts are apparently not available, sorry.");
3815
3816 log_debug("ID mapped mounts are apparently not available on this kernel or for the selected file system, reverting to recursive chown()ing.");
3817 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3818 } else if (r < 0)
3819 return log_error_errno(r, "Failed to set up ID mapped mounts: %m");
3820 else {
3821 log_debug("ID mapped mounts available, making use of them.");
3822 idmap = true;
3823 }
3824 }
3825
3826 if (dissected_image) {
3827 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
3828 r = dissected_image_mount(
3829 dissected_image,
3830 directory,
3831 arg_uid_shift,
3832 arg_uid_range,
3833 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|
3834 DISSECT_IMAGE_DISCARD_ON_LOOP|
3835 DISSECT_IMAGE_USR_NO_ROOT|
3836 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
3837 (idmap ? DISSECT_IMAGE_MOUNT_IDMAPPED : 0));
3838 if (r == -EUCLEAN)
3839 return log_error_errno(r, "File system check for image failed: %m");
3840 if (r < 0)
3841 return log_error_errno(r, "Failed to mount image file system: %m");
3842 }
3843
3844 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
3845 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3846
3847 r = detect_unified_cgroup_hierarchy_from_image(directory);
3848 if (r < 0)
3849 return r;
3850
3851 l = send(unified_cgroup_hierarchy_socket, &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), MSG_NOSIGNAL);
3852 if (l < 0)
3853 return log_error_errno(errno, "Failed to send cgroup mode: %m");
3854 if (l != sizeof(arg_unified_cgroup_hierarchy))
3855 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3856 "Short write while sending cgroup mode.");
3857
3858 unified_cgroup_hierarchy_socket = safe_close(unified_cgroup_hierarchy_socket);
3859 }
3860
3861 /* Mark everything as shared so our mounts get propagated down. This is required to make new bind
3862 * mounts available in systemd services inside the container that create a new mount namespace. See
3863 * https://github.com/systemd/systemd/issues/3860 Further submounts (such as /dev) done after this
3864 * will inherit the shared propagation mode.
3865 *
3866 * IMPORTANT: Do not overmount the root directory anymore from now on to enable moving the root
3867 * directory mount to root later on.
3868 * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
3869 */
3870 r = mount_nofollow_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
3871 if (r < 0)
3872 return r;
3873
3874 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
3875 if (r < 0)
3876 return r;
3877
3878 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
3879 if (r < 0)
3880 return r;
3881
3882 if (arg_read_only && arg_volatile_mode == VOLATILE_NO &&
3883 !has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts)) {
3884 r = bind_remount_recursive(directory, MS_RDONLY, MS_RDONLY, NULL);
3885 if (r < 0)
3886 return log_error_errno(r, "Failed to make tree read-only: %m");
3887 }
3888
3889 r = mount_all(directory,
3890 arg_mount_settings,
3891 arg_uid_shift,
3892 arg_selinux_apifs_context);
3893 if (r < 0)
3894 return r;
3895
3896 r = copy_devnodes(directory);
3897 if (r < 0)
3898 return r;
3899
3900 r = make_extra_nodes(directory);
3901 if (r < 0)
3902 return r;
3903
3904 (void) dev_setup(directory, arg_uid_shift, arg_uid_shift);
3905
3906 p = prefix_roota(directory, "/run/host");
3907 (void) make_inaccessible_nodes(p, arg_uid_shift, arg_uid_shift);
3908
3909 r = setup_pts(directory);
3910 if (r < 0)
3911 return r;
3912
3913 r = setup_propagate(directory);
3914 if (r < 0)
3915 return r;
3916
3917 r = setup_keyring();
3918 if (r < 0)
3919 return r;
3920
3921 r = setup_credentials(directory);
3922 if (r < 0)
3923 return r;
3924
3925 r = bind_user_setup(bind_user_context, directory);
3926 if (r < 0)
3927 return r;
3928
3929 r = mount_custom(
3930 directory,
3931 arg_custom_mounts,
3932 arg_n_custom_mounts,
3933 arg_uid_shift,
3934 arg_uid_range,
3935 arg_selinux_apifs_context,
3936 MOUNT_NON_ROOT_ONLY);
3937 if (r < 0)
3938 return r;
3939
3940 r = setup_timezone(directory);
3941 if (r < 0)
3942 return r;
3943
3944 r = setup_resolv_conf(directory);
3945 if (r < 0)
3946 return r;
3947
3948 r = setup_machine_id(directory);
3949 if (r < 0)
3950 return r;
3951
3952 r = setup_journal(directory);
3953 if (r < 0)
3954 return r;
3955
3956 /* The same stuff as the $container env var, but nicely readable for the entire payload */
3957 p = prefix_roota(directory, "/run/host/container-manager");
3958 (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE);
3959
3960 /* The same stuff as the $container_uuid env var */
3961 p = prefix_roota(directory, "/run/host/container-uuid");
3962 (void) write_string_filef(p, WRITE_STRING_FILE_CREATE, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
3963
3964 if (!arg_use_cgns) {
3965 r = mount_cgroups(
3966 directory,
3967 arg_unified_cgroup_hierarchy,
3968 arg_userns_mode != USER_NAMESPACE_NO,
3969 arg_uid_shift,
3970 arg_uid_range,
3971 arg_selinux_apifs_context,
3972 false);
3973 if (r < 0)
3974 return r;
3975 }
3976
3977 r = mount_move_root(directory);
3978 if (r < 0)
3979 return log_error_errno(r, "Failed to move root directory: %m");
3980
3981 fd = setup_notify_child();
3982 if (fd < 0)
3983 return fd;
3984
3985 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
3986 arg_clone_ns_flags |
3987 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
3988 if (pid < 0)
3989 return log_error_errno(errno, "Failed to fork inner child: %m");
3990 if (pid == 0) {
3991 pid_socket = safe_close(pid_socket);
3992 uuid_socket = safe_close(uuid_socket);
3993 notify_socket = safe_close(notify_socket);
3994 uid_shift_socket = safe_close(uid_shift_socket);
3995
3996 /* The inner child has all namespaces that are requested, so that we all are owned by the
3997 * user if user namespaces are turned on. */
3998
3999 if (arg_network_namespace_path) {
4000 r = namespace_enter(-1, -1, netns_fd, -1, -1);
4001 if (r < 0)
4002 return log_error_errno(r, "Failed to join network namespace: %m");
4003 }
4004
4005 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, master_pty_socket, fds, os_release_pairs);
4006 if (r < 0)
4007 _exit(EXIT_FAILURE);
4008
4009 _exit(EXIT_SUCCESS);
4010 }
4011
4012 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
4013 if (l < 0)
4014 return log_error_errno(errno, "Failed to send PID: %m");
4015 if (l != sizeof(pid))
4016 return log_error_errno(SYNTHETIC_ERRNO(EIO),
4017 "Short write while sending PID.");
4018
4019 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
4020 if (l < 0)
4021 return log_error_errno(errno, "Failed to send machine ID: %m");
4022 if (l != sizeof(arg_uuid))
4023 return log_error_errno(SYNTHETIC_ERRNO(EIO),
4024 "Short write while sending machine ID.");
4025
4026 l = send_one_fd(notify_socket, fd, 0);
4027 if (l < 0)
4028 return log_error_errno(l, "Failed to send notify fd: %m");
4029
4030 pid_socket = safe_close(pid_socket);
4031 uuid_socket = safe_close(uuid_socket);
4032 notify_socket = safe_close(notify_socket);
4033 master_pty_socket = safe_close(master_pty_socket);
4034 kmsg_socket = safe_close(kmsg_socket);
4035 rtnl_socket = safe_close(rtnl_socket);
4036 netns_fd = safe_close(netns_fd);
4037
4038 return 0;
4039 }
4040
4041 static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
4042 bool tried_hashed = false;
4043 unsigned n_tries = 100;
4044 uid_t candidate;
4045 int r;
4046
4047 assert(shift);
4048 assert(ret_lock_file);
4049 assert(arg_userns_mode == USER_NAMESPACE_PICK);
4050 assert(arg_uid_range == 0x10000U);
4051
4052 candidate = *shift;
4053
4054 (void) mkdir("/run/systemd/nspawn-uid", 0755);
4055
4056 for (;;) {
4057 char lock_path[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
4058 _cleanup_(release_lock_file) LockFile lf = LOCK_FILE_INIT;
4059
4060 if (--n_tries <= 0)
4061 return -EBUSY;
4062
4063 if (candidate < CONTAINER_UID_BASE_MIN || candidate > CONTAINER_UID_BASE_MAX)
4064 goto next;
4065 if ((candidate & UINT32_C(0xFFFF)) != 0)
4066 goto next;
4067
4068 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
4069 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
4070 if (r == -EBUSY) /* Range already taken by another nspawn instance */
4071 goto next;
4072 if (r < 0)
4073 return r;
4074
4075 /* Make some superficial checks whether the range is currently known in the user database */
4076 if (getpwuid(candidate))
4077 goto next;
4078 if (getpwuid(candidate + UINT32_C(0xFFFE)))
4079 goto next;
4080 if (getgrgid(candidate))
4081 goto next;
4082 if (getgrgid(candidate + UINT32_C(0xFFFE)))
4083 goto next;
4084
4085 *ret_lock_file = lf;
4086 lf = (struct LockFile) LOCK_FILE_INIT;
4087 *shift = candidate;
4088 return 0;
4089
4090 next:
4091 if (arg_machine && !tried_hashed) {
4092 /* Try to hash the base from the container name */
4093
4094 static const uint8_t hash_key[] = {
4095 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
4096 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
4097 };
4098
4099 candidate = (uid_t) siphash24(arg_machine, strlen(arg_machine), hash_key);
4100
4101 tried_hashed = true;
4102 } else
4103 random_bytes(&candidate, sizeof(candidate));
4104
4105 candidate = (candidate % (CONTAINER_UID_BASE_MAX - CONTAINER_UID_BASE_MIN)) + CONTAINER_UID_BASE_MIN;
4106 candidate &= (uid_t) UINT32_C(0xFFFF0000);
4107 }
4108 }
4109
4110 static int add_one_uid_map(
4111 char **p,
4112 uid_t container_uid,
4113 uid_t host_uid,
4114 uid_t range) {
4115
4116 return strextendf(p,
4117 UID_FMT " " UID_FMT " " UID_FMT "\n",
4118 container_uid, host_uid, range);
4119 }
4120
4121 static int make_uid_map_string(
4122 const uid_t bind_user_uid[],
4123 size_t n_bind_user_uid,
4124 size_t offset,
4125 char **ret) {
4126
4127 _cleanup_free_ char *s = NULL;
4128 uid_t previous_uid = 0;
4129 int r;
4130
4131 assert(n_bind_user_uid == 0 || bind_user_uid);
4132 assert(IN_SET(offset, 0, 2)); /* used to switch between UID and GID map */
4133 assert(ret);
4134
4135 /* The bind_user_uid[] array is a series of 4 uid_t values, for each --bind-user= entry one
4136 * quadruplet, consisting of host and container UID + GID. */
4137
4138 for (size_t i = 0; i < n_bind_user_uid; i++) {
4139 uid_t payload_uid = bind_user_uid[i*4+offset],
4140 host_uid = bind_user_uid[i*4+offset+1];
4141
4142 assert(previous_uid <= payload_uid);
4143 assert(payload_uid < arg_uid_range);
4144
4145 /* Add a range to close the gap to previous entry */
4146 if (payload_uid > previous_uid) {
4147 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, payload_uid - previous_uid);
4148 if (r < 0)
4149 return r;
4150 }
4151
4152 /* Map this specific user */
4153 r = add_one_uid_map(&s, payload_uid, host_uid, 1);
4154 if (r < 0)
4155 return r;
4156
4157 previous_uid = payload_uid + 1;
4158 }
4159
4160 /* And add a range to close the gap to finish the range */
4161 if (arg_uid_range > previous_uid) {
4162 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, arg_uid_range - previous_uid);
4163 if (r < 0)
4164 return r;
4165 }
4166
4167 assert(s);
4168
4169 *ret = TAKE_PTR(s);
4170 return 0;
4171 }
4172
4173 static int setup_uid_map(
4174 pid_t pid,
4175 const uid_t bind_user_uid[],
4176 size_t n_bind_user_uid) {
4177
4178 char uid_map[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1];
4179 _cleanup_free_ char *s = NULL;
4180 int r;
4181
4182 assert(pid > 1);
4183
4184 /* Build the UID map string */
4185 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 0, &s) < 0) /* offset=0 contains the UID pair */
4186 return log_oom();
4187
4188 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
4189 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
4190 if (r < 0)
4191 return log_error_errno(r, "Failed to write UID map: %m");
4192
4193 /* And now build the GID map string */
4194 s = mfree(s);
4195 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 2, &s) < 0) /* offset=2 contains the GID pair */
4196 return log_oom();
4197
4198 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
4199 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
4200 if (r < 0)
4201 return log_error_errno(r, "Failed to write GID map: %m");
4202
4203 return 0;
4204 }
4205
4206 static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
4207 char buf[NOTIFY_BUFFER_MAX+1];
4208 char *p = NULL;
4209 struct iovec iovec = {
4210 .iov_base = buf,
4211 .iov_len = sizeof(buf)-1,
4212 };
4213 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
4214 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control;
4215 struct msghdr msghdr = {
4216 .msg_iov = &iovec,
4217 .msg_iovlen = 1,
4218 .msg_control = &control,
4219 .msg_controllen = sizeof(control),
4220 };
4221 struct ucred *ucred;
4222 ssize_t n;
4223 pid_t inner_child_pid;
4224 _cleanup_strv_free_ char **tags = NULL;
4225 int r;
4226
4227 assert(userdata);
4228
4229 inner_child_pid = PTR_TO_PID(userdata);
4230
4231 if (revents != EPOLLIN) {
4232 log_warning("Got unexpected poll event for notify fd.");
4233 return 0;
4234 }
4235
4236 n = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
4237 if (n < 0) {
4238 if (ERRNO_IS_TRANSIENT(n))
4239 return 0;
4240 if (n == -EXFULL) {
4241 log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
4242 return 0;
4243 }
4244 return log_warning_errno(n, "Couldn't read notification socket: %m");
4245 }
4246
4247 cmsg_close_all(&msghdr);
4248
4249 ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred);
4250 if (!ucred || ucred->pid != inner_child_pid) {
4251 log_debug("Received notify message without valid credentials. Ignoring.");
4252 return 0;
4253 }
4254
4255 if ((size_t) n >= sizeof(buf)) {
4256 log_warning("Received notify message exceeded maximum size. Ignoring.");
4257 return 0;
4258 }
4259
4260 buf[n] = 0;
4261 tags = strv_split(buf, "\n\r");
4262 if (!tags)
4263 return log_oom();
4264
4265 if (strv_contains(tags, "READY=1")) {
4266 r = sd_notify(false, "READY=1\n");
4267 if (r < 0)
4268 log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
4269 }
4270
4271 p = strv_find_startswith(tags, "STATUS=");
4272 if (p)
4273 (void) sd_notifyf(false, "STATUS=Container running: %s", p);
4274
4275 return 0;
4276 }
4277
4278 static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
4279 int r;
4280
4281 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
4282 if (r < 0)
4283 return log_error_errno(r, "Failed to allocate notify event source: %m");
4284
4285 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
4286
4287 return 0;
4288 }
4289
4290 static int merge_settings(Settings *settings, const char *path) {
4291 int rl;
4292
4293 assert(settings);
4294 assert(path);
4295
4296 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
4297 * that this steals the fields of the Settings* structure, and hence modifies it. */
4298
4299 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
4300 settings->start_mode >= 0) {
4301 arg_start_mode = settings->start_mode;
4302 strv_free_and_replace(arg_parameters, settings->parameters);
4303 }
4304
4305 if ((arg_settings_mask & SETTING_EPHEMERAL) == 0 &&
4306 settings->ephemeral >= 0)
4307 arg_ephemeral = settings->ephemeral;
4308
4309 if ((arg_settings_mask & SETTING_DIRECTORY) == 0 &&
4310 settings->root) {
4311
4312 if (!arg_settings_trusted)
4313 log_warning("Ignoring root directory setting, file %s is not trusted.", path);
4314 else
4315 free_and_replace(arg_directory, settings->root);
4316 }
4317
4318 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
4319 settings->pivot_root_new) {
4320 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
4321 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
4322 }
4323
4324 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
4325 settings->working_directory)
4326 free_and_replace(arg_chdir, settings->working_directory);
4327
4328 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
4329 settings->environment)
4330 strv_free_and_replace(arg_setenv, settings->environment);
4331
4332 if ((arg_settings_mask & SETTING_USER) == 0) {
4333
4334 if (settings->user)
4335 free_and_replace(arg_user, settings->user);
4336
4337 if (uid_is_valid(settings->uid))
4338 arg_uid = settings->uid;
4339 if (gid_is_valid(settings->gid))
4340 arg_gid = settings->gid;
4341 if (settings->n_supplementary_gids > 0) {
4342 free_and_replace(arg_supplementary_gids, settings->supplementary_gids);
4343 arg_n_supplementary_gids = settings->n_supplementary_gids;
4344 }
4345 }
4346
4347 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
4348 uint64_t plus, minus;
4349 uint64_t network_minus = 0;
4350 uint64_t ambient;
4351
4352 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
4353 * Settings structure */
4354
4355 plus = settings->capability;
4356 minus = settings->drop_capability;
4357
4358 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
4359 settings_network_configured(settings)) {
4360 if (settings_private_network(settings))
4361 plus |= UINT64_C(1) << CAP_NET_ADMIN;
4362 else
4363 network_minus |= UINT64_C(1) << CAP_NET_ADMIN;
4364 }
4365
4366 if (!arg_settings_trusted && plus != 0) {
4367 if (settings->capability != 0)
4368 log_warning("Ignoring Capability= setting, file %s is not trusted.", path);
4369 } else {
4370 arg_caps_retain &= ~network_minus;
4371 arg_caps_retain |= plus;
4372 }
4373
4374 arg_caps_retain &= ~minus;
4375
4376 /* Copy the full capabilities over too */
4377 if (capability_quintet_is_set(&settings->full_capabilities)) {
4378 if (!arg_settings_trusted)
4379 log_warning("Ignoring capability settings, file %s is not trusted.", path);
4380 else
4381 arg_full_capabilities = settings->full_capabilities;
4382 }
4383
4384 ambient = settings->ambient_capability;
4385 if (!arg_settings_trusted && ambient != 0)
4386 log_warning("Ignoring AmbientCapability= setting, file %s is not trusted.", path);
4387 else
4388 arg_caps_ambient |= ambient;
4389 }
4390
4391 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
4392 settings->kill_signal > 0)
4393 arg_kill_signal = settings->kill_signal;
4394
4395 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
4396 settings->personality != PERSONALITY_INVALID)
4397 arg_personality = settings->personality;
4398
4399 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
4400 !sd_id128_is_null(settings->machine_id)) {
4401
4402 if (!arg_settings_trusted)
4403 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path);
4404 else
4405 arg_uuid = settings->machine_id;
4406 }
4407
4408 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
4409 settings->read_only >= 0)
4410 arg_read_only = settings->read_only;
4411
4412 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
4413 settings->volatile_mode != _VOLATILE_MODE_INVALID)
4414 arg_volatile_mode = settings->volatile_mode;
4415
4416 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
4417 settings->n_custom_mounts > 0) {
4418
4419 if (!arg_settings_trusted)
4420 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path);
4421 else {
4422 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
4423 arg_custom_mounts = TAKE_PTR(settings->custom_mounts);
4424 arg_n_custom_mounts = settings->n_custom_mounts;
4425 settings->n_custom_mounts = 0;
4426 }
4427 }
4428
4429 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
4430 settings_network_configured(settings)) {
4431
4432 if (!arg_settings_trusted)
4433 log_warning("Ignoring network settings, file %s is not trusted.", path);
4434 else {
4435 arg_network_veth = settings_network_veth(settings);
4436 arg_private_network = settings_private_network(settings);
4437
4438 strv_free_and_replace(arg_network_interfaces, settings->network_interfaces);
4439 strv_free_and_replace(arg_network_macvlan, settings->network_macvlan);
4440 strv_free_and_replace(arg_network_ipvlan, settings->network_ipvlan);
4441 strv_free_and_replace(arg_network_veth_extra, settings->network_veth_extra);
4442
4443 free_and_replace(arg_network_bridge, settings->network_bridge);
4444 free_and_replace(arg_network_zone, settings->network_zone);
4445
4446 free_and_replace(arg_network_namespace_path, settings->network_namespace_path);
4447 }
4448 }
4449
4450 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
4451 settings->expose_ports) {
4452
4453 if (!arg_settings_trusted)
4454 log_warning("Ignoring Port= setting, file %s is not trusted.", path);
4455 else {
4456 expose_port_free_all(arg_expose_ports);
4457 arg_expose_ports = TAKE_PTR(settings->expose_ports);
4458 }
4459 }
4460
4461 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
4462 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
4463
4464 if (!arg_settings_trusted)
4465 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path);
4466 else {
4467 arg_userns_mode = settings->userns_mode;
4468 arg_uid_shift = settings->uid_shift;
4469 arg_uid_range = settings->uid_range;
4470 arg_userns_ownership = settings->userns_ownership;
4471 }
4472 }
4473
4474 if ((arg_settings_mask & SETTING_BIND_USER) == 0 &&
4475 !strv_isempty(settings->bind_user))
4476 strv_free_and_replace(arg_bind_user, settings->bind_user);
4477
4478 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0 &&
4479 settings->notify_ready >= 0)
4480 arg_notify_ready = settings->notify_ready;
4481
4482 if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) {
4483
4484 if (!strv_isempty(settings->syscall_allow_list) || !strv_isempty(settings->syscall_deny_list)) {
4485 if (!arg_settings_trusted && !strv_isempty(settings->syscall_allow_list))
4486 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path);
4487 else {
4488 strv_free_and_replace(arg_syscall_allow_list, settings->syscall_allow_list);
4489 strv_free_and_replace(arg_syscall_deny_list, settings->syscall_deny_list);
4490 }
4491 }
4492
4493 #if HAVE_SECCOMP
4494 if (settings->seccomp) {
4495 if (!arg_settings_trusted)
4496 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path);
4497 else {
4498 seccomp_release(arg_seccomp);
4499 arg_seccomp = TAKE_PTR(settings->seccomp);
4500 }
4501 }
4502 #endif
4503 }
4504
4505 for (rl = 0; rl < _RLIMIT_MAX; rl ++) {
4506 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)))
4507 continue;
4508
4509 if (!settings->rlimit[rl])
4510 continue;
4511
4512 if (!arg_settings_trusted) {
4513 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl), path);
4514 continue;
4515 }
4516
4517 free_and_replace(arg_rlimit[rl], settings->rlimit[rl]);
4518 }
4519
4520 if ((arg_settings_mask & SETTING_HOSTNAME) == 0 &&
4521 settings->hostname)
4522 free_and_replace(arg_hostname, settings->hostname);
4523
4524 if ((arg_settings_mask & SETTING_NO_NEW_PRIVILEGES) == 0 &&
4525 settings->no_new_privileges >= 0)
4526 arg_no_new_privileges = settings->no_new_privileges;
4527
4528 if ((arg_settings_mask & SETTING_OOM_SCORE_ADJUST) == 0 &&
4529 settings->oom_score_adjust_set) {
4530
4531 if (!arg_settings_trusted)
4532 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path);
4533 else {
4534 arg_oom_score_adjust = settings->oom_score_adjust;
4535 arg_oom_score_adjust_set = true;
4536 }
4537 }
4538
4539 if ((arg_settings_mask & SETTING_CPU_AFFINITY) == 0 &&
4540 settings->cpu_set.set) {
4541
4542 if (!arg_settings_trusted)
4543 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path);
4544 else {
4545 cpu_set_reset(&arg_cpu_set);
4546 arg_cpu_set = settings->cpu_set;
4547 settings->cpu_set = (CPUSet) {};
4548 }
4549 }
4550
4551 if ((arg_settings_mask & SETTING_RESOLV_CONF) == 0 &&
4552 settings->resolv_conf != _RESOLV_CONF_MODE_INVALID)
4553 arg_resolv_conf = settings->resolv_conf;
4554
4555 if ((arg_settings_mask & SETTING_LINK_JOURNAL) == 0 &&
4556 settings->link_journal != _LINK_JOURNAL_INVALID) {
4557
4558 if (!arg_settings_trusted)
4559 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path);
4560 else {
4561 arg_link_journal = settings->link_journal;
4562 arg_link_journal_try = settings->link_journal_try;
4563 }
4564 }
4565
4566 if ((arg_settings_mask & SETTING_TIMEZONE) == 0 &&
4567 settings->timezone != _TIMEZONE_MODE_INVALID)
4568 arg_timezone = settings->timezone;
4569
4570 if ((arg_settings_mask & SETTING_SLICE) == 0 &&
4571 settings->slice) {
4572
4573 if (!arg_settings_trusted)
4574 log_warning("Ignoring slice setting, file '%s' is not trusted.", path);
4575 else
4576 free_and_replace(arg_slice, settings->slice);
4577 }
4578
4579 if ((arg_settings_mask & SETTING_USE_CGNS) == 0 &&
4580 settings->use_cgns >= 0) {
4581
4582 if (!arg_settings_trusted)
4583 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path);
4584 else
4585 arg_use_cgns = settings->use_cgns;
4586 }
4587
4588 if ((arg_settings_mask & SETTING_CLONE_NS_FLAGS) == 0 &&
4589 settings->clone_ns_flags != ULONG_MAX) {
4590
4591 if (!arg_settings_trusted)
4592 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path);
4593 else
4594 arg_clone_ns_flags = settings->clone_ns_flags;
4595 }
4596
4597 if ((arg_settings_mask & SETTING_CONSOLE_MODE) == 0 &&
4598 settings->console_mode >= 0) {
4599
4600 if (!arg_settings_trusted)
4601 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path);
4602 else
4603 arg_console_mode = settings->console_mode;
4604 }
4605
4606 if ((arg_settings_mask & SETTING_SUPPRESS_SYNC) == 0 &&
4607 settings->suppress_sync >= 0)
4608 arg_suppress_sync = settings->suppress_sync;
4609
4610 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
4611 * don't consult arg_settings_mask for them. */
4612
4613 sd_bus_message_unref(arg_property_message);
4614 arg_property_message = TAKE_PTR(settings->properties);
4615
4616 arg_console_width = settings->console_width;
4617 arg_console_height = settings->console_height;
4618
4619 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
4620 arg_extra_nodes = TAKE_PTR(settings->extra_nodes);
4621 arg_n_extra_nodes = settings->n_extra_nodes;
4622
4623 return 0;
4624 }
4625
4626 static int load_settings(void) {
4627 _cleanup_(settings_freep) Settings *settings = NULL;
4628 _cleanup_fclose_ FILE *f = NULL;
4629 _cleanup_free_ char *p = NULL;
4630 int r;
4631
4632 if (arg_oci_bundle)
4633 return 0;
4634
4635 /* If all settings are masked, there's no point in looking for
4636 * the settings file */
4637 if (FLAGS_SET(arg_settings_mask, _SETTINGS_MASK_ALL))
4638 return 0;
4639
4640 /* We first look in the admin's directories in /etc and /run */
4641 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
4642 _cleanup_free_ char *j = NULL;
4643
4644 j = path_join(i, arg_settings_filename);
4645 if (!j)
4646 return log_oom();
4647
4648 f = fopen(j, "re");
4649 if (f) {
4650 p = TAKE_PTR(j);
4651
4652 /* By default, we trust configuration from /etc and /run */
4653 if (arg_settings_trusted < 0)
4654 arg_settings_trusted = true;
4655
4656 break;
4657 }
4658
4659 if (errno != ENOENT)
4660 return log_error_errno(errno, "Failed to open %s: %m", j);
4661 }
4662
4663 if (!f) {
4664 /* After that, let's look for a file next to the
4665 * actual image we shall boot. */
4666
4667 if (arg_image) {
4668 p = file_in_same_dir(arg_image, arg_settings_filename);
4669 if (!p)
4670 return log_oom();
4671 } else if (arg_directory && !path_equal(arg_directory, "/")) {
4672 p = file_in_same_dir(arg_directory, arg_settings_filename);
4673 if (!p)
4674 return log_oom();
4675 }
4676
4677 if (p) {
4678 f = fopen(p, "re");
4679 if (!f && errno != ENOENT)
4680 return log_error_errno(errno, "Failed to open %s: %m", p);
4681
4682 /* By default, we do not trust configuration from /var/lib/machines */
4683 if (arg_settings_trusted < 0)
4684 arg_settings_trusted = false;
4685 }
4686 }
4687
4688 if (!f)
4689 return 0;
4690
4691 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
4692
4693 r = settings_load(f, p, &settings);
4694 if (r < 0)
4695 return r;
4696
4697 return merge_settings(settings, p);
4698 }
4699
4700 static int load_oci_bundle(void) {
4701 _cleanup_(settings_freep) Settings *settings = NULL;
4702 int r;
4703
4704 if (!arg_oci_bundle)
4705 return 0;
4706
4707 /* By default let's trust OCI bundles */
4708 if (arg_settings_trusted < 0)
4709 arg_settings_trusted = true;
4710
4711 r = oci_load(NULL, arg_oci_bundle, &settings);
4712 if (r < 0)
4713 return r;
4714
4715 return merge_settings(settings, arg_oci_bundle);
4716 }
4717
4718 static int run_container(
4719 DissectedImage *dissected_image,
4720 bool secondary,
4721 FDSet *fds,
4722 char veth_name[IFNAMSIZ], bool *veth_created,
4723 struct ExposeArgs *expose_args,
4724 int *master, pid_t *pid, int *ret) {
4725
4726 static const struct sigaction sa = {
4727 .sa_handler = nop_signal_handler,
4728 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
4729 };
4730
4731 _cleanup_(release_lock_file) LockFile uid_shift_lock = LOCK_FILE_INIT;
4732 _cleanup_close_ int etc_passwd_lock = -1;
4733 _cleanup_close_pair_ int
4734 kmsg_socket_pair[2] = { -1, -1 },
4735 rtnl_socket_pair[2] = { -1, -1 },
4736 pid_socket_pair[2] = { -1, -1 },
4737 uuid_socket_pair[2] = { -1, -1 },
4738 notify_socket_pair[2] = { -1, -1 },
4739 uid_shift_socket_pair[2] = { -1, -1 },
4740 master_pty_socket_pair[2] = { -1, -1 },
4741 unified_cgroup_hierarchy_socket_pair[2] = { -1, -1};
4742
4743 _cleanup_close_ int notify_socket = -1;
4744 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
4745 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
4746 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
4747 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
4748 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
4749 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
4750 _cleanup_free_ uid_t *bind_user_uid = NULL;
4751 size_t n_bind_user_uid = 0;
4752 ContainerStatus container_status = 0;
4753 int ifi = 0, r;
4754 ssize_t l;
4755 sigset_t mask_chld;
4756 _cleanup_close_ int child_netns_fd = -1;
4757
4758 assert_se(sigemptyset(&mask_chld) == 0);
4759 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
4760
4761 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4762 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4763 * check with getpwuid() if the specific user already exists. Note that /etc might be
4764 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4765 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4766 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4767 * really ours. */
4768
4769 etc_passwd_lock = take_etc_passwd_lock(NULL);
4770 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
4771 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
4772 }
4773
4774 r = barrier_create(&barrier);
4775 if (r < 0)
4776 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
4777
4778 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
4779 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
4780
4781 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
4782 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
4783
4784 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
4785 return log_error_errno(errno, "Failed to create pid socket pair: %m");
4786
4787 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
4788 return log_error_errno(errno, "Failed to create id socket pair: %m");
4789
4790 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
4791 return log_error_errno(errno, "Failed to create notify socket pair: %m");
4792
4793 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, master_pty_socket_pair) < 0)
4794 return log_error_errno(errno, "Failed to create console socket pair: %m");
4795
4796 if (arg_userns_mode != USER_NAMESPACE_NO)
4797 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
4798 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
4799
4800 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN)
4801 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, unified_cgroup_hierarchy_socket_pair) < 0)
4802 return log_error_errno(errno, "Failed to create unified cgroup socket pair: %m");
4803
4804 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4805 * parent's blocking calls and give it a chance to call wait() and terminate. */
4806 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
4807 if (r < 0)
4808 return log_error_errno(errno, "Failed to change the signal mask: %m");
4809
4810 r = sigaction(SIGCHLD, &sa, NULL);
4811 if (r < 0)
4812 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
4813
4814 if (arg_network_namespace_path) {
4815 child_netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
4816 if (child_netns_fd < 0)
4817 return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path);
4818
4819 r = fd_is_ns(child_netns_fd, CLONE_NEWNET);
4820 if (r == -EUCLEAN)
4821 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);
4822 else if (r < 0)
4823 return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path);
4824 else if (r == 0)
4825 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4826 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path);
4827 }
4828
4829 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
4830 if (*pid < 0)
4831 return log_error_errno(errno, "clone() failed%s: %m",
4832 errno == EINVAL ?
4833 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4834
4835 if (*pid == 0) {
4836 /* The outer child only has a file system namespace. */
4837 barrier_set_role(&barrier, BARRIER_CHILD);
4838
4839 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
4840 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4841 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
4842 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
4843 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
4844 master_pty_socket_pair[0] = safe_close(master_pty_socket_pair[0]);
4845 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
4846 unified_cgroup_hierarchy_socket_pair[0] = safe_close(unified_cgroup_hierarchy_socket_pair[0]);
4847
4848 (void) reset_all_signal_handlers();
4849 (void) reset_signal_mask();
4850
4851 r = outer_child(&barrier,
4852 arg_directory,
4853 dissected_image,
4854 secondary,
4855 pid_socket_pair[1],
4856 uuid_socket_pair[1],
4857 notify_socket_pair[1],
4858 kmsg_socket_pair[1],
4859 rtnl_socket_pair[1],
4860 uid_shift_socket_pair[1],
4861 master_pty_socket_pair[1],
4862 unified_cgroup_hierarchy_socket_pair[1],
4863 fds,
4864 child_netns_fd);
4865 if (r < 0)
4866 _exit(EXIT_FAILURE);
4867
4868 _exit(EXIT_SUCCESS);
4869 }
4870
4871 barrier_set_role(&barrier, BARRIER_PARENT);
4872
4873 fdset_close(fds);
4874
4875 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
4876 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
4877 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
4878 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
4879 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
4880 master_pty_socket_pair[1] = safe_close(master_pty_socket_pair[1]);
4881 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
4882 unified_cgroup_hierarchy_socket_pair[1] = safe_close(unified_cgroup_hierarchy_socket_pair[1]);
4883
4884 if (arg_userns_mode != USER_NAMESPACE_NO) {
4885 /* The child just let us know the UID shift it might have read from the image. */
4886 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
4887 if (l < 0)
4888 return log_error_errno(errno, "Failed to read UID shift: %m");
4889 if (l != sizeof arg_uid_shift)
4890 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading UID shift.");
4891
4892 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4893 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4894 * image, but if that's already in use, pick a new one, and report back to the child,
4895 * which one we now picked. */
4896
4897 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
4898 if (r < 0)
4899 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
4900
4901 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
4902 if (l < 0)
4903 return log_error_errno(errno, "Failed to send UID shift: %m");
4904 if (l != sizeof arg_uid_shift)
4905 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write while writing UID shift.");
4906 }
4907
4908 n_bind_user_uid = strv_length(arg_bind_user);
4909 if (n_bind_user_uid > 0) {
4910 /* Right after the UID shift, we'll receive the list of UID mappings for the
4911 * --bind-user= logic. Always a quadruplet of payload and host UID + GID. */
4912
4913 bind_user_uid = new(uid_t, n_bind_user_uid*4);
4914 if (!bind_user_uid)
4915 return log_oom();
4916
4917 for (size_t i = 0; i < n_bind_user_uid; i++) {
4918 l = recv(uid_shift_socket_pair[0], bind_user_uid + i*4, sizeof(uid_t)*4, 0);
4919 if (l < 0)
4920 return log_error_errno(errno, "Failed to read user UID map pair: %m");
4921 if (l != sizeof(uid_t)*4)
4922 return log_full_errno(l == 0 ? LOG_DEBUG : LOG_WARNING,
4923 SYNTHETIC_ERRNO(EIO),
4924 "Short read while reading bind user UID pairs.");
4925 }
4926 }
4927 }
4928
4929 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
4930 /* The child let us know the support cgroup mode it might have read from the image. */
4931 l = recv(unified_cgroup_hierarchy_socket_pair[0], &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), 0);
4932 if (l < 0)
4933 return log_error_errno(errno, "Failed to read cgroup mode: %m");
4934 if (l != sizeof(arg_unified_cgroup_hierarchy))
4935 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading cgroup mode (%zi bytes).%s",
4936 l, l == 0 ? " The child is most likely dead." : "");
4937 }
4938
4939 /* Wait for the outer child. */
4940 r = wait_for_terminate_and_check("(sd-namespace)", *pid, WAIT_LOG_ABNORMAL);
4941 if (r < 0)
4942 return r;
4943 if (r != EXIT_SUCCESS)
4944 return -EIO;
4945
4946 /* And now retrieve the PID of the inner child. */
4947 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
4948 if (l < 0)
4949 return log_error_errno(errno, "Failed to read inner child PID: %m");
4950 if (l != sizeof *pid)
4951 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading inner child PID.");
4952
4953 /* We also retrieve container UUID in case it was generated by outer child */
4954 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
4955 if (l < 0)
4956 return log_error_errno(errno, "Failed to read container machine ID: %m");
4957 if (l != sizeof(arg_uuid))
4958 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading container machined ID.");
4959
4960 /* We also retrieve the socket used for notifications generated by outer child */
4961 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
4962 if (notify_socket < 0)
4963 return log_error_errno(notify_socket,
4964 "Failed to receive notification socket from the outer child: %m");
4965
4966 log_debug("Init process invoked as PID "PID_FMT, *pid);
4967
4968 if (arg_userns_mode != USER_NAMESPACE_NO) {
4969 if (!barrier_place_and_sync(&barrier)) /* #1 */
4970 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
4971
4972 r = setup_uid_map(*pid, bind_user_uid, n_bind_user_uid);
4973 if (r < 0)
4974 return r;
4975
4976 (void) barrier_place(&barrier); /* #2 */
4977 }
4978
4979 if (arg_private_network) {
4980 if (!arg_network_namespace_path) {
4981 /* Wait until the child has unshared its network namespace. */
4982 if (!barrier_place_and_sync(&barrier)) /* #3 */
4983 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early");
4984 }
4985
4986 if (child_netns_fd < 0) {
4987 /* Make sure we have an open file descriptor to the child's network
4988 * namespace so it stays alive even if the child exits. */
4989 r = namespace_open(*pid, NULL, NULL, &child_netns_fd, NULL, NULL);
4990 if (r < 0)
4991 return log_error_errno(r, "Failed to open child network namespace: %m");
4992 }
4993
4994 r = move_network_interfaces(child_netns_fd, arg_network_interfaces);
4995 if (r < 0)
4996 return r;
4997
4998 if (arg_network_veth) {
4999 r = setup_veth(arg_machine, *pid, veth_name,
5000 arg_network_bridge || arg_network_zone);
5001 if (r < 0)
5002 return r;
5003 else if (r > 0)
5004 ifi = r;
5005
5006 if (arg_network_bridge) {
5007 /* Add the interface to a bridge */
5008 r = setup_bridge(veth_name, arg_network_bridge, false);
5009 if (r < 0)
5010 return r;
5011 if (r > 0)
5012 ifi = r;
5013 } else if (arg_network_zone) {
5014 /* Add the interface to a bridge, possibly creating it */
5015 r = setup_bridge(veth_name, arg_network_zone, true);
5016 if (r < 0)
5017 return r;
5018 if (r > 0)
5019 ifi = r;
5020 }
5021 }
5022
5023 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
5024 if (r < 0)
5025 return r;
5026
5027 /* We created the primary and extra veth links now; let's remember this, so that we know to
5028 remove them later on. Note that we don't bother with removing veth links that were created
5029 here when their setup failed half-way, because in that case the kernel should be able to
5030 remove them on its own, since they cannot be referenced by anything yet. */
5031 *veth_created = true;
5032
5033 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
5034 if (r < 0)
5035 return r;
5036
5037 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
5038 if (r < 0)
5039 return r;
5040 }
5041
5042 if (arg_register || !arg_keep_unit) {
5043 r = sd_bus_default_system(&bus);
5044 if (r < 0)
5045 return log_error_errno(r, "Failed to open system bus: %m");
5046
5047 r = sd_bus_set_close_on_exit(bus, false);
5048 if (r < 0)
5049 return log_error_errno(r, "Failed to disable close-on-exit behaviour: %m");
5050 }
5051
5052 if (!arg_keep_unit) {
5053 /* When a new scope is created for this container, then we'll be registered as its controller, in which
5054 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
5055 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
5056
5057 r = sd_bus_match_signal_async(
5058 bus,
5059 NULL,
5060 "org.freedesktop.systemd1",
5061 NULL,
5062 "org.freedesktop.systemd1.Scope",
5063 "RequestStop",
5064 on_request_stop, NULL, PID_TO_PTR(*pid));
5065 if (r < 0)
5066 return log_error_errno(r, "Failed to request RequestStop match: %m");
5067 }
5068
5069 if (arg_register) {
5070 r = register_machine(
5071 bus,
5072 arg_machine,
5073 *pid,
5074 arg_directory,
5075 arg_uuid,
5076 ifi,
5077 arg_slice,
5078 arg_custom_mounts, arg_n_custom_mounts,
5079 arg_kill_signal,
5080 arg_property,
5081 arg_property_message,
5082 arg_keep_unit,
5083 arg_container_service_name);
5084 if (r < 0)
5085 return r;
5086
5087 } else if (!arg_keep_unit) {
5088 r = allocate_scope(
5089 bus,
5090 arg_machine,
5091 *pid,
5092 arg_slice,
5093 arg_custom_mounts, arg_n_custom_mounts,
5094 arg_kill_signal,
5095 arg_property,
5096 arg_property_message);
5097 if (r < 0)
5098 return r;
5099
5100 } else if (arg_slice || arg_property)
5101 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
5102
5103 r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy);
5104 if (r < 0)
5105 return r;
5106
5107 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
5108 if (r < 0)
5109 return r;
5110
5111 r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
5112 if (r < 0)
5113 return r;
5114
5115 /* Notify the child that the parent is ready with all
5116 * its setup (including cgroup-ification), and that
5117 * the child can now hand over control to the code to
5118 * run inside the container. */
5119 (void) barrier_place(&barrier); /* #4 */
5120
5121 /* Block SIGCHLD here, before notifying child.
5122 * process_pty() will handle it with the other signals. */
5123 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
5124
5125 /* Reset signal to default */
5126 r = default_signals(SIGCHLD);
5127 if (r < 0)
5128 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
5129
5130 r = sd_event_new(&event);
5131 if (r < 0)
5132 return log_error_errno(r, "Failed to get default event source: %m");
5133
5134 (void) sd_event_set_watchdog(event, true);
5135
5136 if (bus) {
5137 r = sd_bus_attach_event(bus, event, 0);
5138 if (r < 0)
5139 return log_error_errno(r, "Failed to attach bus to event loop: %m");
5140 }
5141
5142 r = setup_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
5143 if (r < 0)
5144 return r;
5145
5146 /* Let the child know that we are ready and wait that the child is completely ready now. */
5147 if (!barrier_place_and_sync(&barrier)) /* #5 */
5148 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
5149
5150 /* At this point we have made use of the UID we picked, and thus nss-systemd/systemd-machined.service
5151 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
5152 etc_passwd_lock = safe_close(etc_passwd_lock);
5153
5154 (void) sd_notifyf(false,
5155 "STATUS=Container running.\n"
5156 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
5157 if (!arg_notify_ready) {
5158 r = sd_notify(false, "READY=1\n");
5159 if (r < 0)
5160 log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
5161 }
5162
5163 if (arg_kill_signal > 0) {
5164 /* Try to kill the init system on SIGINT or SIGTERM */
5165 (void) sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
5166 (void) sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
5167 } else {
5168 /* Immediately exit */
5169 (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
5170 (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
5171 }
5172
5173 /* Exit when the child exits */
5174 (void) sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
5175
5176 if (arg_expose_ports) {
5177 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, expose_args, &rtnl);
5178 if (r < 0)
5179 return r;
5180
5181 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5182 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
5183 }
5184
5185 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
5186
5187 if (arg_console_mode != CONSOLE_PIPE) {
5188 _cleanup_close_ int fd = -1;
5189 PTYForwardFlags flags = 0;
5190
5191 /* Retrieve the master pty allocated by inner child */
5192 fd = receive_one_fd(master_pty_socket_pair[0], 0);
5193 if (fd < 0)
5194 return log_error_errno(fd, "Failed to receive master pty from the inner child: %m");
5195
5196 switch (arg_console_mode) {
5197
5198 case CONSOLE_READ_ONLY:
5199 flags |= PTY_FORWARD_READ_ONLY;
5200
5201 _fallthrough_;
5202
5203 case CONSOLE_INTERACTIVE:
5204 flags |= PTY_FORWARD_IGNORE_VHANGUP;
5205
5206 r = pty_forward_new(event, fd, flags, &forward);
5207 if (r < 0)
5208 return log_error_errno(r, "Failed to create PTY forwarder: %m");
5209
5210 if (arg_console_width != UINT_MAX || arg_console_height != UINT_MAX)
5211 (void) pty_forward_set_width_height(forward,
5212 arg_console_width,
5213 arg_console_height);
5214 break;
5215
5216 default:
5217 assert(arg_console_mode == CONSOLE_PASSIVE);
5218 }
5219
5220 *master = TAKE_FD(fd);
5221 }
5222
5223 r = sd_event_loop(event);
5224 if (r < 0)
5225 return log_error_errno(r, "Failed to run event loop: %m");
5226
5227 if (forward) {
5228 char last_char = 0;
5229
5230 (void) pty_forward_get_last_char(forward, &last_char);
5231 forward = pty_forward_free(forward);
5232
5233 if (!arg_quiet && last_char != '\n')
5234 putc('\n', stdout);
5235 }
5236
5237 /* Kill if it is not dead yet anyway */
5238 if (!arg_register && !arg_keep_unit && bus)
5239 terminate_scope(bus, arg_machine);
5240
5241 /* Normally redundant, but better safe than sorry */
5242 (void) kill(*pid, SIGKILL);
5243
5244 if (arg_private_network) {
5245 /* Move network interfaces back to the parent network namespace. We use `safe_fork`
5246 * to avoid having to move the parent to the child network namespace. */
5247 r = safe_fork(NULL, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
5248 if (r < 0)
5249 return r;
5250
5251 if (r == 0) {
5252 _cleanup_close_ int parent_netns_fd = -1;
5253
5254 r = namespace_open(getpid(), NULL, NULL, &parent_netns_fd, NULL, NULL);
5255 if (r < 0) {
5256 log_error_errno(r, "Failed to open parent network namespace: %m");
5257 _exit(EXIT_FAILURE);
5258 }
5259
5260 r = namespace_enter(-1, -1, child_netns_fd, -1, -1);
5261 if (r < 0) {
5262 log_error_errno(r, "Failed to enter child network namespace: %m");
5263 _exit(EXIT_FAILURE);
5264 }
5265
5266 r = move_network_interfaces(parent_netns_fd, arg_network_interfaces);
5267 if (r < 0)
5268 log_error_errno(r, "Failed to move network interfaces back to parent network namespace: %m");
5269
5270 _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
5271 }
5272 }
5273
5274 r = wait_for_container(TAKE_PID(*pid), &container_status);
5275
5276 /* Tell machined that we are gone. */
5277 if (bus)
5278 (void) unregister_machine(bus, arg_machine);
5279
5280 if (r < 0)
5281 /* We failed to wait for the container, or the container exited abnormally. */
5282 return r;
5283 if (r > 0 || container_status == CONTAINER_TERMINATED) {
5284 /* r > 0 → The container exited with a non-zero status.
5285 * As a special case, we need to replace 133 with a different value,
5286 * because 133 is special-cased in the service file to reboot the container.
5287 * otherwise → The container exited with zero status and a reboot was not requested.
5288 */
5289 if (r == EXIT_FORCE_RESTART)
5290 r = EXIT_FAILURE; /* replace 133 with the general failure code */
5291 *ret = r;
5292 return 0; /* finito */
5293 }
5294
5295 /* CONTAINER_REBOOTED, loop again */
5296
5297 if (arg_keep_unit) {
5298 /* Special handling if we are running as a service: instead of simply
5299 * restarting the machine we want to restart the entire service, so let's
5300 * inform systemd about this with the special exit code 133. The service
5301 * file uses RestartForceExitStatus=133 so that this results in a full
5302 * nspawn restart. This is necessary since we might have cgroup parameters
5303 * set we want to have flushed out. */
5304 *ret = EXIT_FORCE_RESTART;
5305 return 0; /* finito */
5306 }
5307
5308 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5309 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
5310
5311 (void) remove_veth_links(veth_name, arg_network_veth_extra);
5312 *veth_created = false;
5313 return 1; /* loop again */
5314 }
5315
5316 static int initialize_rlimits(void) {
5317 /* The default resource limits the kernel passes to PID 1, as per kernel 5.16. Let's pass our container payload
5318 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
5319 * container execution environments. */
5320
5321 static const struct rlimit kernel_defaults[_RLIMIT_MAX] = {
5322 [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY },
5323 [RLIMIT_CORE] = { 0, RLIM_INFINITY },
5324 [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY },
5325 [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY },
5326 [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY },
5327 [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY },
5328 [RLIMIT_MEMLOCK] = { DEFAULT_RLIMIT_MEMLOCK, DEFAULT_RLIMIT_MEMLOCK },
5329 [RLIMIT_MSGQUEUE] = { 819200, 819200 },
5330 [RLIMIT_NICE] = { 0, 0 },
5331 [RLIMIT_NOFILE] = { 1024, 4096 },
5332 [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY },
5333 [RLIMIT_RTPRIO] = { 0, 0 },
5334 [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY },
5335 [RLIMIT_STACK] = { 8388608, RLIM_INFINITY },
5336
5337 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
5338 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
5339 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
5340 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
5341 * that PID 1 changes a number of other resource limits during early initialization which is why we
5342 * don't read the other limits from PID 1 but prefer the static table above. */
5343 };
5344
5345 int rl;
5346
5347 for (rl = 0; rl < _RLIMIT_MAX; rl++) {
5348 /* Let's only fill in what the user hasn't explicitly configured anyway */
5349 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)) == 0) {
5350 const struct rlimit *v;
5351 struct rlimit buffer;
5352
5353 if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) {
5354 /* For these two let's read the limits off PID 1. See above for an explanation. */
5355
5356 if (prlimit(1, rl, NULL, &buffer) < 0)
5357 return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
5358
5359 v = &buffer;
5360 } else if (rl == RLIMIT_NOFILE) {
5361 /* We nowadays bump RLIMIT_NOFILE's hard limit early in PID 1 for all
5362 * userspace. Given that nspawn containers are often run without our PID 1,
5363 * let's grant the containers a raised RLIMIT_NOFILE hard limit by default,
5364 * so that container userspace gets similar resources as host userspace
5365 * gets. */
5366 buffer = kernel_defaults[rl];
5367 buffer.rlim_max = MIN((rlim_t) read_nr_open(), (rlim_t) HIGH_RLIMIT_NOFILE);
5368 v = &buffer;
5369 } else
5370 v = kernel_defaults + rl;
5371
5372 arg_rlimit[rl] = newdup(struct rlimit, v, 1);
5373 if (!arg_rlimit[rl])
5374 return log_oom();
5375 }
5376
5377 if (DEBUG_LOGGING) {
5378 _cleanup_free_ char *k = NULL;
5379
5380 (void) rlimit_format(arg_rlimit[rl], &k);
5381 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl), k);
5382 }
5383 }
5384
5385 return 0;
5386 }
5387
5388 static int cant_be_in_netns(void) {
5389 _cleanup_close_ int fd = -1;
5390 struct ucred ucred;
5391 int r;
5392
5393 /* Check if we are in the same netns as udev. If we aren't, then device monitoring (and thus waiting
5394 * for loopback block devices) won't work, and we will hang. Detect this case and exit early with a
5395 * nice message. */
5396
5397 if (!arg_image) /* only matters if --image= us used, i.e. we actually need to use loopback devices */
5398 return 0;
5399
5400 fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
5401 if (fd < 0)
5402 return log_error_errno(errno, "Failed to allocate udev control socket: %m");
5403
5404 r = connect_unix_path(fd, AT_FDCWD, "/run/udev/control");
5405 if (r < 0) {
5406 if (r == -ENOENT || ERRNO_IS_DISCONNECT(r))
5407 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5408 "Sorry, but --image= requires access to the host's /run/ hierarchy, since we need access to udev.");
5409
5410 return log_error_errno(r, "Failed to connect socket to udev control socket: %m");
5411 }
5412
5413 r = getpeercred(fd, &ucred);
5414 if (r < 0)
5415 return log_error_errno(r, "Failed to determine peer of udev control socket: %m");
5416
5417 r = in_same_namespace(ucred.pid, 0, NAMESPACE_NET);
5418 if (r < 0)
5419 return log_error_errno(r, "Failed to determine network namespace of udev: %m");
5420 if (r == 0)
5421 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5422 "Sorry, but --image= is only supported in the main network namespace, since we need access to udev/AF_NETLINK.");
5423 return 0;
5424 }
5425
5426 static int run(int argc, char *argv[]) {
5427 bool secondary = false, remove_directory = false, remove_image = false,
5428 veth_created = false, remove_tmprootdir = false;
5429 _cleanup_close_ int master = -1;
5430 _cleanup_fdset_free_ FDSet *fds = NULL;
5431 int r, n_fd_passed, ret = EXIT_SUCCESS;
5432 char veth_name[IFNAMSIZ] = "";
5433 struct ExposeArgs expose_args = {};
5434 _cleanup_(release_lock_file) LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
5435 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
5436 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
5437 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
5438 _cleanup_(fw_ctx_freep) FirewallContext *fw_ctx = NULL;
5439 pid_t pid = 0;
5440
5441 log_parse_environment();
5442 log_open();
5443
5444 r = parse_argv(argc, argv);
5445 if (r <= 0)
5446 goto finish;
5447
5448 if (geteuid() != 0) {
5449 r = log_warning_errno(SYNTHETIC_ERRNO(EPERM),
5450 argc >= 2 ? "Need to be root." :
5451 "Need to be root (and some arguments are usually required).\nHint: try --help");
5452 goto finish;
5453 }
5454
5455 r = cant_be_in_netns();
5456 if (r < 0)
5457 goto finish;
5458
5459 r = initialize_rlimits();
5460 if (r < 0)
5461 goto finish;
5462
5463 r = load_oci_bundle();
5464 if (r < 0)
5465 goto finish;
5466
5467 r = determine_names();
5468 if (r < 0)
5469 goto finish;
5470
5471 r = load_settings();
5472 if (r < 0)
5473 goto finish;
5474
5475 r = cg_unified();
5476 if (r < 0) {
5477 log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
5478 goto finish;
5479 }
5480
5481 r = verify_arguments();
5482 if (r < 0)
5483 goto finish;
5484
5485 /* Reapply environment settings. */
5486 (void) detect_unified_cgroup_hierarchy_from_environment();
5487
5488 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
5489 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
5490 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
5491 (void) ignore_signals(SIGPIPE);
5492
5493 n_fd_passed = sd_listen_fds(false);
5494 if (n_fd_passed > 0) {
5495 r = fdset_new_listen_fds(&fds, false);
5496 if (r < 0) {
5497 log_error_errno(r, "Failed to collect file descriptors: %m");
5498 goto finish;
5499 }
5500 }
5501
5502 /* The "default" umask. This is appropriate for most file and directory
5503 * operations performed by nspawn, and is the umask that will be used for
5504 * the child. Functions like copy_devnodes() change the umask temporarily. */
5505 umask(0022);
5506
5507 if (arg_directory) {
5508 assert(!arg_image);
5509
5510 /* Safety precaution: let's not allow running images from the live host OS image, as long as
5511 * /var from the host will propagate into container dynamically (because bad things happen if
5512 * two systems write to the same /var). Let's allow it for the special cases where /var is
5513 * either copied (i.e. --ephemeral) or replaced (i.e. --volatile=yes|state). */
5514 if (path_equal(arg_directory, "/") && !(arg_ephemeral || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_STATE))) {
5515 log_error("Spawning container on root directory is not supported. Consider using --ephemeral, --volatile=yes or --volatile=state.");
5516 r = -EINVAL;
5517 goto finish;
5518 }
5519
5520 if (arg_ephemeral) {
5521 _cleanup_free_ char *np = NULL;
5522
5523 r = chase_symlinks_and_update(&arg_directory, 0);
5524 if (r < 0)
5525 goto finish;
5526
5527 /* If the specified path is a mount point we generate the new snapshot immediately
5528 * inside it under a random name. However if the specified is not a mount point we
5529 * create the new snapshot in the parent directory, just next to it. */
5530 r = path_is_mount_point(arg_directory, NULL, 0);
5531 if (r < 0) {
5532 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
5533 goto finish;
5534 }
5535 if (r > 0)
5536 r = tempfn_random_child(arg_directory, "machine.", &np);
5537 else
5538 r = tempfn_random(arg_directory, "machine.", &np);
5539 if (r < 0) {
5540 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
5541 goto finish;
5542 }
5543
5544 /* We take an exclusive lock on this image, since it's our private, ephemeral copy
5545 * only owned by us and no one else. */
5546 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
5547 if (r < 0) {
5548 log_error_errno(r, "Failed to lock %s: %m", np);
5549 goto finish;
5550 }
5551
5552 {
5553 BLOCK_SIGNALS(SIGINT);
5554 r = btrfs_subvol_snapshot(arg_directory, np,
5555 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5556 BTRFS_SNAPSHOT_FALLBACK_COPY |
5557 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5558 BTRFS_SNAPSHOT_RECURSIVE |
5559 BTRFS_SNAPSHOT_QUOTA |
5560 BTRFS_SNAPSHOT_SIGINT);
5561 }
5562 if (r == -EINTR) {
5563 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", np);
5564 goto finish;
5565 }
5566 if (r < 0) {
5567 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
5568 goto finish;
5569 }
5570
5571 free_and_replace(arg_directory, np);
5572 remove_directory = true;
5573 } else {
5574 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
5575 if (r < 0)
5576 goto finish;
5577
5578 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5579 if (r == -EBUSY) {
5580 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
5581 goto finish;
5582 }
5583 if (r < 0) {
5584 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
5585 goto finish;
5586 }
5587
5588 if (arg_template) {
5589 r = chase_symlinks_and_update(&arg_template, 0);
5590 if (r < 0)
5591 goto finish;
5592
5593 {
5594 BLOCK_SIGNALS(SIGINT);
5595 r = btrfs_subvol_snapshot(arg_template, arg_directory,
5596 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5597 BTRFS_SNAPSHOT_FALLBACK_COPY |
5598 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5599 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
5600 BTRFS_SNAPSHOT_RECURSIVE |
5601 BTRFS_SNAPSHOT_QUOTA |
5602 BTRFS_SNAPSHOT_SIGINT);
5603 }
5604 if (r == -EEXIST)
5605 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5606 "Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
5607 else if (r == -EINTR) {
5608 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", arg_directory);
5609 goto finish;
5610 } else if (r < 0) {
5611 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
5612 goto finish;
5613 } else
5614 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5615 "Populated %s from template %s.", arg_directory, arg_template);
5616 }
5617 }
5618
5619 if (arg_start_mode == START_BOOT) {
5620 _cleanup_free_ char *b = NULL;
5621 const char *p;
5622
5623 if (arg_pivot_root_new) {
5624 b = path_join(arg_directory, arg_pivot_root_new);
5625 if (!b)
5626 return log_oom();
5627
5628 p = b;
5629 } else
5630 p = arg_directory;
5631
5632 if (path_is_os_tree(p) <= 0) {
5633 r = log_error_errno(SYNTHETIC_ERRNO(EINVAL),
5634 "Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p);
5635 goto finish;
5636 }
5637 } else {
5638 _cleanup_free_ char *p = NULL;
5639
5640 if (arg_pivot_root_new)
5641 p = path_join(arg_directory, arg_pivot_root_new, "/usr/");
5642 else
5643 p = path_join(arg_directory, "/usr/");
5644 if (!p)
5645 return log_oom();
5646
5647 if (laccess(p, F_OK) < 0) {
5648 r = log_error_errno(SYNTHETIC_ERRNO(EINVAL),
5649 "Directory %s doesn't look like it has an OS tree (/usr/ directory is missing). Refusing.", arg_directory);
5650 goto finish;
5651 }
5652 }
5653
5654 } else {
5655 DissectImageFlags dissect_image_flags =
5656 DISSECT_IMAGE_GENERIC_ROOT |
5657 DISSECT_IMAGE_REQUIRE_ROOT |
5658 DISSECT_IMAGE_RELAX_VAR_CHECK |
5659 DISSECT_IMAGE_USR_NO_ROOT;
5660 assert(arg_image);
5661 assert(!arg_template);
5662
5663 r = chase_symlinks_and_update(&arg_image, 0);
5664 if (r < 0)
5665 goto finish;
5666
5667 if (arg_ephemeral) {
5668 _cleanup_free_ char *np = NULL;
5669
5670 r = tempfn_random(arg_image, "machine.", &np);
5671 if (r < 0) {
5672 log_error_errno(r, "Failed to generate name for image snapshot: %m");
5673 goto finish;
5674 }
5675
5676 /* Always take an exclusive lock on our own ephemeral copy. */
5677 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
5678 if (r < 0) {
5679 r = log_error_errno(r, "Failed to create image lock: %m");
5680 goto finish;
5681 }
5682
5683 {
5684 BLOCK_SIGNALS(SIGINT);
5685 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);
5686 }
5687 if (r == -EINTR) {
5688 log_error_errno(r, "Interrupted while copying image file to %s, removed again.", np);
5689 goto finish;
5690 }
5691 if (r < 0) {
5692 r = log_error_errno(r, "Failed to copy image file: %m");
5693 goto finish;
5694 }
5695
5696 free_and_replace(arg_image, np);
5697 remove_image = true;
5698 } else {
5699 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5700 if (r == -EBUSY) {
5701 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
5702 goto finish;
5703 }
5704 if (r < 0) {
5705 r = log_error_errno(r, "Failed to create image lock: %m");
5706 goto finish;
5707 }
5708
5709 r = verity_settings_load(
5710 &arg_verity_settings,
5711 arg_image, NULL, NULL);
5712 if (r < 0) {
5713 log_error_errno(r, "Failed to read verity artefacts for %s: %m", arg_image);
5714 goto finish;
5715 }
5716
5717 if (arg_verity_settings.data_path)
5718 dissect_image_flags |= DISSECT_IMAGE_NO_PARTITION_TABLE;
5719 }
5720
5721 if (!mkdtemp(tmprootdir)) {
5722 r = log_error_errno(errno, "Failed to create temporary directory: %m");
5723 goto finish;
5724 }
5725
5726 remove_tmprootdir = true;
5727
5728 arg_directory = strdup(tmprootdir);
5729 if (!arg_directory) {
5730 r = log_oom();
5731 goto finish;
5732 }
5733
5734 r = loop_device_make_by_path(
5735 arg_image,
5736 arg_read_only ? O_RDONLY : O_RDWR,
5737 FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
5738 LOCK_SH,
5739 &loop);
5740 if (r < 0) {
5741 log_error_errno(r, "Failed to set up loopback block device: %m");
5742 goto finish;
5743 }
5744
5745 r = dissect_loop_device_and_warn(
5746 loop,
5747 &arg_verity_settings,
5748 NULL,
5749 dissect_image_flags,
5750 &dissected_image);
5751 if (r == -ENOPKG) {
5752 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
5753 log_notice("Note that the disk image needs to\n"
5754 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
5755 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
5756 " c) or follow https://systemd.io/DISCOVERABLE_PARTITIONS\n"
5757 " d) or contain a file system without a partition table\n"
5758 "in order to be bootable with systemd-nspawn.");
5759 goto finish;
5760 }
5761 if (r < 0)
5762 goto finish;
5763
5764 r = dissected_image_load_verity_sig_partition(
5765 dissected_image,
5766 loop->fd,
5767 &arg_verity_settings);
5768 if (r < 0)
5769 goto finish;
5770
5771 if (dissected_image->has_verity && !arg_verity_settings.root_hash && !dissected_image->has_verity_sig)
5772 log_notice("Note: image %s contains verity information, but no root hash specified and no embedded "
5773 "root hash signature found! Proceeding without integrity checking.", arg_image);
5774
5775 r = dissected_image_decrypt_interactively(
5776 dissected_image,
5777 NULL,
5778 &arg_verity_settings,
5779 0);
5780 if (r < 0)
5781 goto finish;
5782
5783 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
5784 if (remove_image && unlink(arg_image) >= 0)
5785 remove_image = false;
5786 }
5787
5788 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
5789 if (r < 0)
5790 goto finish;
5791
5792 if (arg_console_mode < 0)
5793 arg_console_mode =
5794 isatty(STDIN_FILENO) > 0 &&
5795 isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
5796
5797 if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
5798 arg_quiet = true;
5799
5800 if (!arg_quiet)
5801 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
5802 arg_machine, arg_image ?: arg_directory);
5803
5804 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
5805
5806 if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) < 0) {
5807 r = log_error_errno(errno, "Failed to become subreaper: %m");
5808 goto finish;
5809 }
5810
5811 if (arg_expose_ports) {
5812 r = fw_ctx_new(&fw_ctx);
5813 if (r < 0) {
5814 log_error_errno(r, "Cannot expose configured ports, firewall initialization failed: %m");
5815 goto finish;
5816 }
5817 expose_args.fw_ctx = fw_ctx;
5818 }
5819 for (;;) {
5820 r = run_container(dissected_image,
5821 secondary,
5822 fds,
5823 veth_name, &veth_created,
5824 &expose_args, &master,
5825 &pid, &ret);
5826 if (r <= 0)
5827 break;
5828 }
5829
5830 finish:
5831 (void) sd_notify(false,
5832 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
5833 "STOPPING=1\nSTATUS=Terminating...");
5834
5835 if (pid > 0)
5836 (void) kill(pid, SIGKILL);
5837
5838 /* Try to flush whatever is still queued in the pty */
5839 if (master >= 0) {
5840 (void) copy_bytes(master, STDOUT_FILENO, UINT64_MAX, 0);
5841 master = safe_close(master);
5842 }
5843
5844 if (pid > 0)
5845 (void) wait_for_terminate(pid, NULL);
5846
5847 pager_close();
5848
5849 if (remove_directory && arg_directory) {
5850 int k;
5851
5852 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
5853 if (k < 0)
5854 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
5855 }
5856
5857 if (remove_image && arg_image) {
5858 if (unlink(arg_image) < 0)
5859 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
5860 }
5861
5862 if (remove_tmprootdir) {
5863 if (rmdir(tmprootdir) < 0)
5864 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
5865 }
5866
5867 if (arg_machine) {
5868 const char *p;
5869
5870 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
5871 (void) rm_rf(p, REMOVE_ROOT);
5872 }
5873
5874 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET, &expose_args.address4);
5875 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET6, &expose_args.address6);
5876
5877 if (veth_created)
5878 (void) remove_veth_links(veth_name, arg_network_veth_extra);
5879 (void) remove_bridge(arg_network_zone);
5880
5881 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
5882 expose_port_free_all(arg_expose_ports);
5883 rlimit_free_all(arg_rlimit);
5884 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
5885 credential_free_all(arg_credentials, arg_n_credentials);
5886
5887 if (r < 0)
5888 return r;
5889
5890 return ret;
5891 }
5892
5893 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.