]> 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 #23048 from keszybz/Add-more-tests-for-specifiers
[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 "bus-error.h"
32 #include "bus-util.h"
33 #include "cap-list.h"
34 #include "capability-util.h"
35 #include "cgroup-util.h"
36 #include "chase-symlinks.h"
37 #include "copy.h"
38 #include "cpu-set-util.h"
39 #include "creds-util.h"
40 #include "dev-setup.h"
41 #include "discover-image.h"
42 #include "dissect-image.h"
43 #include "env-util.h"
44 #include "escape.h"
45 #include "fd-util.h"
46 #include "fdset.h"
47 #include "fileio.h"
48 #include "format-util.h"
49 #include "fs-util.h"
50 #include "gpt.h"
51 #include "hexdecoct.h"
52 #include "hostname-setup.h"
53 #include "hostname-util.h"
54 #include "id128-util.h"
55 #include "io-util.h"
56 #include "log.h"
57 #include "loop-util.h"
58 #include "loopback-setup.h"
59 #include "macro.h"
60 #include "main-func.h"
61 #include "missing_sched.h"
62 #include "mkdir.h"
63 #include "mount-util.h"
64 #include "mountpoint-util.h"
65 #include "namespace-util.h"
66 #include "netlink-util.h"
67 #include "nspawn-bind-user.h"
68 #include "nspawn-cgroup.h"
69 #include "nspawn-creds.h"
70 #include "nspawn-def.h"
71 #include "nspawn-expose-ports.h"
72 #include "nspawn-mount.h"
73 #include "nspawn-network.h"
74 #include "nspawn-oci.h"
75 #include "nspawn-patch-uid.h"
76 #include "nspawn-register.h"
77 #include "nspawn-seccomp.h"
78 #include "nspawn-settings.h"
79 #include "nspawn-setuid.h"
80 #include "nspawn-stub-pid1.h"
81 #include "nspawn-util.h"
82 #include "nspawn.h"
83 #include "nulstr-util.h"
84 #include "os-util.h"
85 #include "pager.h"
86 #include "parse-argument.h"
87 #include "parse-util.h"
88 #include "pretty-print.h"
89 #include "process-util.h"
90 #include "ptyfwd.h"
91 #include "random-util.h"
92 #include "raw-clone.h"
93 #include "resolve-util.h"
94 #include "rlimit-util.h"
95 #include "rm-rf.h"
96 #if HAVE_SECCOMP
97 #include "seccomp-util.h"
98 #endif
99 #include "selinux-util.h"
100 #include "signal-util.h"
101 #include "socket-util.h"
102 #include "stat-util.h"
103 #include "stdio-util.h"
104 #include "string-table.h"
105 #include "string-util.h"
106 #include "strv.h"
107 #include "sysctl-util.h"
108 #include "terminal-util.h"
109 #include "tmpfile-util.h"
110 #include "umask-util.h"
111 #include "unit-name.h"
112 #include "user-util.h"
113 #include "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
234 STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
235 STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
236 STATIC_DESTRUCTOR_REGISTER(arg_chdir, freep);
237 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new, freep);
238 STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old, freep);
239 STATIC_DESTRUCTOR_REGISTER(arg_user, freep);
240 STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids, freep);
241 STATIC_DESTRUCTOR_REGISTER(arg_machine, freep);
242 STATIC_DESTRUCTOR_REGISTER(arg_hostname, freep);
243 STATIC_DESTRUCTOR_REGISTER(arg_slice, freep);
244 STATIC_DESTRUCTOR_REGISTER(arg_setenv, strv_freep);
245 STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces, strv_freep);
246 STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan, strv_freep);
247 STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan, strv_freep);
248 STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra, strv_freep);
249 STATIC_DESTRUCTOR_REGISTER(arg_network_bridge, freep);
250 STATIC_DESTRUCTOR_REGISTER(arg_network_zone, freep);
251 STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path, freep);
252 STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
253 STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle, freep);
254 STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep);
255 STATIC_DESTRUCTOR_REGISTER(arg_property_message, sd_bus_message_unrefp);
256 STATIC_DESTRUCTOR_REGISTER(arg_parameters, strv_freep);
257 STATIC_DESTRUCTOR_REGISTER(arg_verity_settings, verity_settings_done);
258 STATIC_DESTRUCTOR_REGISTER(arg_syscall_allow_list, strv_freep);
259 STATIC_DESTRUCTOR_REGISTER(arg_syscall_deny_list, strv_freep);
260 #if HAVE_SECCOMP
261 STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep);
262 #endif
263 STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset);
264 STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
265 STATIC_DESTRUCTOR_REGISTER(arg_bind_user, strv_freep);
266
267 static int handle_arg_console(const char *arg) {
268 if (streq(arg, "help")) {
269 puts("autopipe\n"
270 "interactive\n"
271 "passive\n"
272 "pipe\n"
273 "read-only");
274 return 0;
275 }
276
277 if (streq(arg, "interactive"))
278 arg_console_mode = CONSOLE_INTERACTIVE;
279 else if (streq(arg, "read-only"))
280 arg_console_mode = CONSOLE_READ_ONLY;
281 else if (streq(arg, "passive"))
282 arg_console_mode = CONSOLE_PASSIVE;
283 else if (streq(arg, "pipe")) {
284 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
285 log_full(arg_quiet ? LOG_DEBUG : LOG_NOTICE,
286 "Console mode 'pipe' selected, but standard input/output are connected to an interactive TTY. "
287 "Most likely you want to use 'interactive' console mode for proper interactivity and shell job control. "
288 "Proceeding anyway.");
289
290 arg_console_mode = CONSOLE_PIPE;
291 } else if (streq(arg, "autopipe")) {
292 if (isatty(STDIN_FILENO) > 0 && isatty(STDOUT_FILENO) > 0)
293 arg_console_mode = CONSOLE_INTERACTIVE;
294 else
295 arg_console_mode = CONSOLE_PIPE;
296 } else
297 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown console mode: %s", optarg);
298
299 arg_settings_mask |= SETTING_CONSOLE_MODE;
300 return 1;
301 }
302
303 static int help(void) {
304 _cleanup_free_ char *link = NULL;
305 int r;
306
307 pager_open(arg_pager_flags);
308
309 r = terminal_urlify_man("systemd-nspawn", "1", &link);
310 if (r < 0)
311 return log_oom();
312
313 printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
314 "%5$sSpawn a command or OS in a light-weight container.%6$s\n\n"
315 " -h --help Show this help\n"
316 " --version Print version string\n"
317 " -q --quiet Do not show status information\n"
318 " --no-pager Do not pipe output into a pager\n"
319 " --settings=BOOLEAN Load additional settings from .nspawn file\n\n"
320 "%3$sImage:%4$s\n"
321 " -D --directory=PATH Root directory for the container\n"
322 " --template=PATH Initialize root directory from template directory,\n"
323 " if missing\n"
324 " -x --ephemeral Run container with snapshot of root directory, and\n"
325 " remove it after exit\n"
326 " -i --image=PATH Root file system disk image (or device node) for\n"
327 " the container\n"
328 " --oci-bundle=PATH OCI bundle directory\n"
329 " --read-only Mount the root directory read-only\n"
330 " --volatile[=MODE] Run the system in volatile mode\n"
331 " --root-hash=HASH Specify verity root hash for root disk image\n"
332 " --root-hash-sig=SIG Specify pkcs7 signature of root hash for verity\n"
333 " as a DER encoded PKCS7, either as a path to a file\n"
334 " or as an ASCII base64 encoded string prefixed by\n"
335 " 'base64:'\n"
336 " --verity-data=PATH Specify hash device for verity\n"
337 " --pivot-root=PATH[:PATH]\n"
338 " Pivot root to given directory in the container\n\n"
339 "%3$sExecution:%4$s\n"
340 " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
341 " -b --boot Boot up full system (i.e. invoke init)\n"
342 " --chdir=PATH Set working directory in the container\n"
343 " -E --setenv=NAME[=VALUE] Pass an environment variable to PID 1\n"
344 " -u --user=USER Run the command under specified user or UID\n"
345 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
346 " --notify-ready=BOOLEAN Receive notifications from the child init process\n"
347 " --suppress-sync=BOOLEAN\n"
348 " Suppress any form of disk data synchronization\n\n"
349 "%3$sSystem Identity:%4$s\n"
350 " -M --machine=NAME Set the machine name for the container\n"
351 " --hostname=NAME Override the hostname for the container\n"
352 " --uuid=UUID Set a specific machine UUID for the container\n\n"
353 "%3$sProperties:%4$s\n"
354 " -S --slice=SLICE Place the container in the specified slice\n"
355 " --property=NAME=VALUE Set scope unit property\n"
356 " --register=BOOLEAN Register container as machine\n"
357 " --keep-unit Do not register a scope for the machine, reuse\n"
358 " the service unit nspawn is running in\n\n"
359 "%3$sUser Namespacing:%4$s\n"
360 " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n"
361 " --private-users[=UIDBASE[:NUIDS]]\n"
362 " Similar, but with user configured UID/GID range\n"
363 " --private-users-ownership=MODE\n"
364 " Adjust ('chown') or map ('map') OS tree ownership\n"
365 " to private UID/GID range\n\n"
366 "%3$sNetworking:%4$s\n"
367 " --private-network Disable network in container\n"
368 " --network-interface=INTERFACE\n"
369 " Assign an existing network interface to the\n"
370 " container\n"
371 " --network-macvlan=INTERFACE\n"
372 " Create a macvlan network interface based on an\n"
373 " existing network interface to the container\n"
374 " --network-ipvlan=INTERFACE\n"
375 " Create an ipvlan network interface based on an\n"
376 " existing network interface to the container\n"
377 " -n --network-veth Add a virtual Ethernet connection between host\n"
378 " and container\n"
379 " --network-veth-extra=HOSTIF[:CONTAINERIF]\n"
380 " Add an additional virtual Ethernet link between\n"
381 " host and container\n"
382 " --network-bridge=INTERFACE\n"
383 " Add a virtual Ethernet connection to the container\n"
384 " and attach it to an existing bridge on the host\n"
385 " --network-zone=NAME Similar, but attach the new interface to an\n"
386 " an automatically managed bridge interface\n"
387 " --network-namespace-path=PATH\n"
388 " Set network namespace to the one represented by\n"
389 " the specified kernel namespace file node\n"
390 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
391 " Expose a container IP port on the host\n\n"
392 "%3$sSecurity:%4$s\n"
393 " --capability=CAP In addition to the default, retain specified\n"
394 " capability\n"
395 " --drop-capability=CAP Drop the specified capability from the default set\n"
396 " --ambient-capability=CAP\n"
397 " Sets the specified capability for the started\n"
398 " process. Not useful if booting a machine.\n"
399 " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n"
400 " --system-call-filter=LIST|~LIST\n"
401 " Permit/prohibit specific system calls\n"
402 " -Z --selinux-context=SECLABEL\n"
403 " Set the SELinux security context to be used by\n"
404 " processes in the container\n"
405 " -L --selinux-apifs-context=SECLABEL\n"
406 " Set the SELinux security context to be used by\n"
407 " API/tmpfs file systems in the container\n\n"
408 "%3$sResources:%4$s\n"
409 " --rlimit=NAME=LIMIT Set a resource limit for the payload\n"
410 " --oom-score-adjust=VALUE\n"
411 " Adjust the OOM score value for the payload\n"
412 " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n"
413 " --personality=ARCH Pick personality for this container\n\n"
414 "%3$sIntegration:%4$s\n"
415 " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n"
416 " --timezone=MODE Select mode of /etc/localtime initialization\n"
417 " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
418 " host, try-guest, try-host\n"
419 " -j Equivalent to --link-journal=try-guest\n\n"
420 "%3$sMounts:%4$s\n"
421 " --bind=PATH[:PATH[:OPTIONS]]\n"
422 " Bind mount a file or directory from the host into\n"
423 " the container\n"
424 " --bind-ro=PATH[:PATH[:OPTIONS]\n"
425 " Similar, but creates a read-only bind mount\n"
426 " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n"
427 " it\n"
428 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
429 " --overlay=PATH[:PATH...]:PATH\n"
430 " Create an overlay mount from the host to \n"
431 " the container\n"
432 " --overlay-ro=PATH[:PATH...]:PATH\n"
433 " Similar, but creates a read-only overlay mount\n"
434 " --bind-user=NAME Bind user from host to container\n\n"
435 "%3$sInput/Output:%4$s\n"
436 " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
437 " set up for the container.\n"
438 " -P --pipe Equivalent to --console=pipe\n\n"
439 "%3$sCredentials:%4$s\n"
440 " --set-credential=ID:VALUE\n"
441 " Pass a credential with literal value to container.\n"
442 " --load-credential=ID:PATH\n"
443 " Load credential to pass to container from file or\n"
444 " AF_UNIX stream socket.\n"
445 "\nSee the %2$s for details.\n",
446 program_invocation_short_name,
447 link,
448 ansi_underline(),
449 ansi_normal(),
450 ansi_highlight(),
451 ansi_normal());
452
453 return 0;
454 }
455
456 static int custom_mount_check_all(void) {
457 size_t i;
458
459 for (i = 0; i < arg_n_custom_mounts; i++) {
460 CustomMount *m = &arg_custom_mounts[i];
461
462 if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) {
463 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_OFF)
464 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
465 "--private-users-ownership=own may not be combined with custom root mounts.");
466 if (arg_uid_shift == UID_INVALID)
467 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
468 "--private-users with automatic UID shift may not be combined with custom root mounts.");
469 }
470 }
471
472 return 0;
473 }
474
475 static int detect_unified_cgroup_hierarchy_from_environment(void) {
476 const char *e, *var = "SYSTEMD_NSPAWN_UNIFIED_HIERARCHY";
477 int r;
478
479 /* Allow the user to control whether the unified hierarchy is used */
480
481 e = getenv(var);
482 if (!e) {
483 /* $UNIFIED_CGROUP_HIERARCHY has been renamed to $SYSTEMD_NSPAWN_UNIFIED_HIERARCHY. */
484 var = "UNIFIED_CGROUP_HIERARCHY";
485 e = getenv(var);
486 }
487
488 if (!isempty(e)) {
489 r = parse_boolean(e);
490 if (r < 0)
491 return log_error_errno(r, "Failed to parse $%s: %m", var);
492 if (r > 0)
493 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
494 else
495 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
496 }
497
498 return 0;
499 }
500
501 static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
502 int r;
503
504 /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
505 * in the image actually supports. */
506 r = cg_all_unified();
507 if (r < 0)
508 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
509 if (r > 0) {
510 /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection
511 * routine only detects 231, so we'll have a false negative here for 230. */
512 r = systemd_installation_has_version(directory, "230");
513 if (r < 0)
514 return log_error_errno(r, "Failed to determine systemd version in container: %m");
515 if (r > 0)
516 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
517 else
518 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
519 } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
520 /* Mixed cgroup hierarchy support was added in 233 */
521 r = systemd_installation_has_version(directory, "233");
522 if (r < 0)
523 return log_error_errno(r, "Failed to determine systemd version in container: %m");
524 if (r > 0)
525 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
526 else
527 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
528 } else
529 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
530
531 log_debug("Using %s hierarchy for container.",
532 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_NONE ? "legacy" :
533 arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_SYSTEMD ? "hybrid" : "unified");
534
535 return 0;
536 }
537
538 static int parse_capability_spec(const char *spec, uint64_t *ret_mask) {
539 uint64_t mask = 0;
540 int r;
541
542 for (;;) {
543 _cleanup_free_ char *t = NULL;
544
545 r = extract_first_word(&spec, &t, ",", 0);
546 if (r < 0)
547 return log_error_errno(r, "Failed to parse capability %s.", t);
548 if (r == 0)
549 break;
550
551 if (streq(t, "help")) {
552 for (int i = 0; i < capability_list_length(); i++) {
553 const char *name;
554
555 name = capability_to_name(i);
556 if (name)
557 puts(name);
558 }
559
560 return 0; /* quit */
561 }
562
563 if (streq(t, "all"))
564 mask = UINT64_MAX;
565 else {
566 r = capability_from_name(t);
567 if (r < 0)
568 return log_error_errno(r, "Failed to parse capability %s.", t);
569
570 mask |= 1ULL << r;
571 }
572 }
573
574 *ret_mask = mask;
575 return 1; /* continue */
576 }
577
578 static int parse_share_ns_env(const char *name, unsigned long ns_flag) {
579 int r;
580
581 r = getenv_bool(name);
582 if (r == -ENXIO)
583 return 0;
584 if (r < 0)
585 return log_error_errno(r, "Failed to parse $%s: %m", name);
586
587 arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag);
588 arg_settings_mask |= SETTING_CLONE_NS_FLAGS;
589 return 0;
590 }
591
592 static int parse_mount_settings_env(void) {
593 const char *e;
594 int r;
595
596 r = getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP");
597 if (r < 0 && r != -ENXIO)
598 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP: %m");
599 if (r >= 0)
600 SET_FLAG(arg_mount_settings, MOUNT_APPLY_TMPFS_TMP, r > 0);
601
602 e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE");
603 if (streq_ptr(e, "network"))
604 arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS;
605
606 else if (e) {
607 r = parse_boolean(e);
608 if (r < 0)
609 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_API_VFS_WRITABLE: %m");
610
611 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0);
612 SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false);
613 }
614
615 return 0;
616 }
617
618 static int parse_environment(void) {
619 const char *e;
620 int r;
621
622 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
623 if (r < 0)
624 return r;
625 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
626 if (r < 0)
627 return r;
628 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
629 if (r < 0)
630 return r;
631 r = parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS);
632 if (r < 0)
633 return r;
634
635 r = parse_mount_settings_env();
636 if (r < 0)
637 return r;
638
639 /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use,
640 * even if it is supported. If not supported, it has no effect. */
641 if (!cg_ns_supported())
642 arg_use_cgns = false;
643 else {
644 r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS");
645 if (r < 0) {
646 if (r != -ENXIO)
647 return log_error_errno(r, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS: %m");
648
649 arg_use_cgns = true;
650 } else {
651 arg_use_cgns = r > 0;
652 arg_settings_mask |= SETTING_USE_CGNS;
653 }
654 }
655
656 e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE");
657 if (e)
658 arg_container_service_name = e;
659
660 r = getenv_bool("SYSTEMD_SUPPRESS_SYNC");
661 if (r >= 0)
662 arg_suppress_sync = r;
663 else if (r != -ENXIO)
664 log_debug_errno(r, "Failed to parse $SYSTEMD_SUPPRESS_SYNC, ignoring: %m");
665
666 return detect_unified_cgroup_hierarchy_from_environment();
667 }
668
669 static int parse_argv(int argc, char *argv[]) {
670 enum {
671 ARG_VERSION = 0x100,
672 ARG_PRIVATE_NETWORK,
673 ARG_UUID,
674 ARG_READ_ONLY,
675 ARG_CAPABILITY,
676 ARG_AMBIENT_CAPABILITY,
677 ARG_DROP_CAPABILITY,
678 ARG_LINK_JOURNAL,
679 ARG_BIND,
680 ARG_BIND_RO,
681 ARG_TMPFS,
682 ARG_OVERLAY,
683 ARG_OVERLAY_RO,
684 ARG_INACCESSIBLE,
685 ARG_SHARE_SYSTEM,
686 ARG_REGISTER,
687 ARG_KEEP_UNIT,
688 ARG_NETWORK_INTERFACE,
689 ARG_NETWORK_MACVLAN,
690 ARG_NETWORK_IPVLAN,
691 ARG_NETWORK_BRIDGE,
692 ARG_NETWORK_ZONE,
693 ARG_NETWORK_VETH_EXTRA,
694 ARG_NETWORK_NAMESPACE_PATH,
695 ARG_PERSONALITY,
696 ARG_VOLATILE,
697 ARG_TEMPLATE,
698 ARG_PROPERTY,
699 ARG_PRIVATE_USERS,
700 ARG_KILL_SIGNAL,
701 ARG_SETTINGS,
702 ARG_CHDIR,
703 ARG_PIVOT_ROOT,
704 ARG_PRIVATE_USERS_CHOWN,
705 ARG_PRIVATE_USERS_OWNERSHIP,
706 ARG_NOTIFY_READY,
707 ARG_ROOT_HASH,
708 ARG_ROOT_HASH_SIG,
709 ARG_VERITY_DATA,
710 ARG_SYSTEM_CALL_FILTER,
711 ARG_RLIMIT,
712 ARG_HOSTNAME,
713 ARG_NO_NEW_PRIVILEGES,
714 ARG_OOM_SCORE_ADJUST,
715 ARG_CPU_AFFINITY,
716 ARG_RESOLV_CONF,
717 ARG_TIMEZONE,
718 ARG_CONSOLE,
719 ARG_PIPE,
720 ARG_OCI_BUNDLE,
721 ARG_NO_PAGER,
722 ARG_SET_CREDENTIAL,
723 ARG_LOAD_CREDENTIAL,
724 ARG_BIND_USER,
725 ARG_SUPPRESS_SYNC,
726 };
727
728 static const struct option options[] = {
729 { "help", no_argument, NULL, 'h' },
730 { "version", no_argument, NULL, ARG_VERSION },
731 { "directory", required_argument, NULL, 'D' },
732 { "template", required_argument, NULL, ARG_TEMPLATE },
733 { "ephemeral", no_argument, NULL, 'x' },
734 { "user", required_argument, NULL, 'u' },
735 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
736 { "as-pid2", no_argument, NULL, 'a' },
737 { "boot", no_argument, NULL, 'b' },
738 { "uuid", required_argument, NULL, ARG_UUID },
739 { "read-only", no_argument, NULL, ARG_READ_ONLY },
740 { "capability", required_argument, NULL, ARG_CAPABILITY },
741 { "ambient-capability", required_argument, NULL, ARG_AMBIENT_CAPABILITY },
742 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
743 { "no-new-privileges", required_argument, NULL, ARG_NO_NEW_PRIVILEGES },
744 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
745 { "bind", required_argument, NULL, ARG_BIND },
746 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
747 { "tmpfs", required_argument, NULL, ARG_TMPFS },
748 { "overlay", required_argument, NULL, ARG_OVERLAY },
749 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
750 { "inaccessible", required_argument, NULL, ARG_INACCESSIBLE },
751 { "machine", required_argument, NULL, 'M' },
752 { "hostname", required_argument, NULL, ARG_HOSTNAME },
753 { "slice", required_argument, NULL, 'S' },
754 { "setenv", required_argument, NULL, 'E' },
755 { "selinux-context", required_argument, NULL, 'Z' },
756 { "selinux-apifs-context", required_argument, NULL, 'L' },
757 { "quiet", no_argument, NULL, 'q' },
758 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
759 { "register", required_argument, NULL, ARG_REGISTER },
760 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
761 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
762 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
763 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
764 { "network-veth", no_argument, NULL, 'n' },
765 { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
766 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
767 { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
768 { "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH },
769 { "personality", required_argument, NULL, ARG_PERSONALITY },
770 { "image", required_argument, NULL, 'i' },
771 { "volatile", optional_argument, NULL, ARG_VOLATILE },
772 { "port", required_argument, NULL, 'p' },
773 { "property", required_argument, NULL, ARG_PROPERTY },
774 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
775 { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN }, /* obsolete */
776 { "private-users-ownership",required_argument, NULL, ARG_PRIVATE_USERS_OWNERSHIP},
777 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
778 { "settings", required_argument, NULL, ARG_SETTINGS },
779 { "chdir", required_argument, NULL, ARG_CHDIR },
780 { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
781 { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
782 { "root-hash", required_argument, NULL, ARG_ROOT_HASH },
783 { "root-hash-sig", required_argument, NULL, ARG_ROOT_HASH_SIG },
784 { "verity-data", required_argument, NULL, ARG_VERITY_DATA },
785 { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
786 { "rlimit", required_argument, NULL, ARG_RLIMIT },
787 { "oom-score-adjust", required_argument, NULL, ARG_OOM_SCORE_ADJUST },
788 { "cpu-affinity", required_argument, NULL, ARG_CPU_AFFINITY },
789 { "resolv-conf", required_argument, NULL, ARG_RESOLV_CONF },
790 { "timezone", required_argument, NULL, ARG_TIMEZONE },
791 { "console", required_argument, NULL, ARG_CONSOLE },
792 { "pipe", no_argument, NULL, ARG_PIPE },
793 { "oci-bundle", required_argument, NULL, ARG_OCI_BUNDLE },
794 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
795 { "set-credential", required_argument, NULL, ARG_SET_CREDENTIAL },
796 { "load-credential", required_argument, NULL, ARG_LOAD_CREDENTIAL },
797 { "bind-user", required_argument, NULL, ARG_BIND_USER },
798 { "suppress-sync", required_argument, NULL, ARG_SUPPRESS_SYNC },
799 {}
800 };
801
802 int c, r;
803 uint64_t plus = 0, minus = 0;
804 bool mask_all_settings = false, mask_no_settings = false;
805
806 assert(argc >= 0);
807 assert(argv);
808
809 while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0)
810 switch (c) {
811
812 case 'h':
813 return help();
814
815 case ARG_VERSION:
816 return version();
817
818 case 'D':
819 r = parse_path_argument(optarg, false, &arg_directory);
820 if (r < 0)
821 return r;
822
823 arg_settings_mask |= SETTING_DIRECTORY;
824 break;
825
826 case ARG_TEMPLATE:
827 r = parse_path_argument(optarg, false, &arg_template);
828 if (r < 0)
829 return r;
830
831 arg_settings_mask |= SETTING_DIRECTORY;
832 break;
833
834 case 'i':
835 r = parse_path_argument(optarg, false, &arg_image);
836 if (r < 0)
837 return r;
838
839 arg_settings_mask |= SETTING_DIRECTORY;
840 break;
841
842 case ARG_OCI_BUNDLE:
843 r = parse_path_argument(optarg, false, &arg_oci_bundle);
844 if (r < 0)
845 return r;
846
847 break;
848
849 case 'x':
850 arg_ephemeral = true;
851 arg_settings_mask |= SETTING_EPHEMERAL;
852 break;
853
854 case 'u':
855 r = free_and_strdup(&arg_user, optarg);
856 if (r < 0)
857 return log_oom();
858
859 arg_settings_mask |= SETTING_USER;
860 break;
861
862 case ARG_NETWORK_ZONE: {
863 char *j;
864
865 j = strjoin("vz-", optarg);
866 if (!j)
867 return log_oom();
868
869 if (!ifname_valid(j)) {
870 log_error("Network zone name not valid: %s", j);
871 free(j);
872 return -EINVAL;
873 }
874
875 free_and_replace(arg_network_zone, j);
876
877 arg_network_veth = true;
878 arg_private_network = true;
879 arg_settings_mask |= SETTING_NETWORK;
880 break;
881 }
882
883 case ARG_NETWORK_BRIDGE:
884
885 if (!ifname_valid(optarg))
886 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
887 "Bridge interface name not valid: %s", optarg);
888
889 r = free_and_strdup(&arg_network_bridge, optarg);
890 if (r < 0)
891 return log_oom();
892
893 _fallthrough_;
894 case 'n':
895 arg_network_veth = true;
896 arg_private_network = true;
897 arg_settings_mask |= SETTING_NETWORK;
898 break;
899
900 case ARG_NETWORK_VETH_EXTRA:
901 r = veth_extra_parse(&arg_network_veth_extra, optarg);
902 if (r < 0)
903 return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg);
904
905 arg_private_network = true;
906 arg_settings_mask |= SETTING_NETWORK;
907 break;
908
909 case ARG_NETWORK_INTERFACE:
910 if (!ifname_valid(optarg))
911 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
912 "Network interface name not valid: %s", optarg);
913
914 r = test_network_interface_initialized(optarg);
915 if (r < 0)
916 return r;
917
918 if (strv_extend(&arg_network_interfaces, optarg) < 0)
919 return log_oom();
920
921 arg_private_network = true;
922 arg_settings_mask |= SETTING_NETWORK;
923 break;
924
925 case ARG_NETWORK_MACVLAN:
926
927 if (!ifname_valid(optarg))
928 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
929 "MACVLAN network interface name not valid: %s", optarg);
930
931 r = test_network_interface_initialized(optarg);
932 if (r < 0)
933 return r;
934
935 if (strv_extend(&arg_network_macvlan, optarg) < 0)
936 return log_oom();
937
938 arg_private_network = true;
939 arg_settings_mask |= SETTING_NETWORK;
940 break;
941
942 case ARG_NETWORK_IPVLAN:
943
944 if (!ifname_valid(optarg))
945 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
946 "IPVLAN network interface name not valid: %s", optarg);
947
948 r = test_network_interface_initialized(optarg);
949 if (r < 0)
950 return r;
951
952 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
953 return log_oom();
954
955 _fallthrough_;
956 case ARG_PRIVATE_NETWORK:
957 arg_private_network = true;
958 arg_settings_mask |= SETTING_NETWORK;
959 break;
960
961 case ARG_NETWORK_NAMESPACE_PATH:
962 r = parse_path_argument(optarg, false, &arg_network_namespace_path);
963 if (r < 0)
964 return r;
965
966 arg_settings_mask |= SETTING_NETWORK;
967 break;
968
969 case 'b':
970 if (arg_start_mode == START_PID2)
971 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
972 "--boot and --as-pid2 may not be combined.");
973
974 arg_start_mode = START_BOOT;
975 arg_settings_mask |= SETTING_START_MODE;
976 break;
977
978 case 'a':
979 if (arg_start_mode == START_BOOT)
980 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
981 "--boot and --as-pid2 may not be combined.");
982
983 arg_start_mode = START_PID2;
984 arg_settings_mask |= SETTING_START_MODE;
985 break;
986
987 case ARG_UUID:
988 r = sd_id128_from_string(optarg, &arg_uuid);
989 if (r < 0)
990 return log_error_errno(r, "Invalid UUID: %s", optarg);
991
992 if (sd_id128_is_null(arg_uuid))
993 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
994 "Machine UUID may not be all zeroes.");
995
996 arg_settings_mask |= SETTING_MACHINE_ID;
997 break;
998
999 case 'S': {
1000 _cleanup_free_ char *mangled = NULL;
1001
1002 r = unit_name_mangle_with_suffix(optarg, NULL, UNIT_NAME_MANGLE_WARN, ".slice", &mangled);
1003 if (r < 0)
1004 return log_oom();
1005
1006 free_and_replace(arg_slice, mangled);
1007 arg_settings_mask |= SETTING_SLICE;
1008 break;
1009 }
1010
1011 case 'M':
1012 if (isempty(optarg))
1013 arg_machine = mfree(arg_machine);
1014 else {
1015 if (!hostname_is_valid(optarg, 0))
1016 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1017 "Invalid machine name: %s", optarg);
1018
1019 r = free_and_strdup(&arg_machine, optarg);
1020 if (r < 0)
1021 return log_oom();
1022 }
1023 break;
1024
1025 case ARG_HOSTNAME:
1026 if (isempty(optarg))
1027 arg_hostname = mfree(arg_hostname);
1028 else {
1029 if (!hostname_is_valid(optarg, 0))
1030 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1031 "Invalid hostname: %s", optarg);
1032
1033 r = free_and_strdup(&arg_hostname, optarg);
1034 if (r < 0)
1035 return log_oom();
1036 }
1037
1038 arg_settings_mask |= SETTING_HOSTNAME;
1039 break;
1040
1041 case 'Z':
1042 arg_selinux_context = optarg;
1043 break;
1044
1045 case 'L':
1046 arg_selinux_apifs_context = optarg;
1047 break;
1048
1049 case ARG_READ_ONLY:
1050 arg_read_only = true;
1051 arg_settings_mask |= SETTING_READ_ONLY;
1052 break;
1053
1054 case ARG_AMBIENT_CAPABILITY: {
1055 uint64_t m;
1056 r = parse_capability_spec(optarg, &m);
1057 if (r <= 0)
1058 return r;
1059 arg_caps_ambient |= m;
1060 arg_settings_mask |= SETTING_CAPABILITY;
1061 break;
1062 }
1063 case ARG_CAPABILITY:
1064 case ARG_DROP_CAPABILITY: {
1065 uint64_t m;
1066 r = parse_capability_spec(optarg, &m);
1067 if (r <= 0)
1068 return r;
1069
1070 if (c == ARG_CAPABILITY)
1071 plus |= m;
1072 else
1073 minus |= m;
1074 arg_settings_mask |= SETTING_CAPABILITY;
1075 break;
1076 }
1077 case ARG_NO_NEW_PRIVILEGES:
1078 r = parse_boolean(optarg);
1079 if (r < 0)
1080 return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg);
1081
1082 arg_no_new_privileges = r;
1083 arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES;
1084 break;
1085
1086 case 'j':
1087 arg_link_journal = LINK_GUEST;
1088 arg_link_journal_try = true;
1089 arg_settings_mask |= SETTING_LINK_JOURNAL;
1090 break;
1091
1092 case ARG_LINK_JOURNAL:
1093 r = parse_link_journal(optarg, &arg_link_journal, &arg_link_journal_try);
1094 if (r < 0)
1095 return log_error_errno(r, "Failed to parse link journal mode %s", optarg);
1096
1097 arg_settings_mask |= SETTING_LINK_JOURNAL;
1098 break;
1099
1100 case ARG_BIND:
1101 case ARG_BIND_RO:
1102 r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO);
1103 if (r < 0)
1104 return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg);
1105
1106 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1107 break;
1108
1109 case ARG_TMPFS:
1110 r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1111 if (r < 0)
1112 return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg);
1113
1114 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1115 break;
1116
1117 case ARG_OVERLAY:
1118 case ARG_OVERLAY_RO:
1119 r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO);
1120 if (r == -EADDRNOTAVAIL)
1121 return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified.");
1122 if (r < 0)
1123 return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg);
1124
1125 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1126 break;
1127
1128 case ARG_INACCESSIBLE:
1129 r = inaccessible_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg);
1130 if (r < 0)
1131 return log_error_errno(r, "Failed to parse --inaccessible= argument %s: %m", optarg);
1132
1133 arg_settings_mask |= SETTING_CUSTOM_MOUNTS;
1134 break;
1135
1136 case 'E':
1137 r = strv_env_replace_strdup_passthrough(&arg_setenv, optarg);
1138 if (r < 0)
1139 return log_error_errno(r, "Cannot assign environment variable %s: %m", optarg);
1140
1141 arg_settings_mask |= SETTING_ENVIRONMENT;
1142 break;
1143
1144 case 'q':
1145 arg_quiet = true;
1146 break;
1147
1148 case ARG_SHARE_SYSTEM:
1149 /* We don't officially support this anymore, except for compat reasons. People should use the
1150 * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */
1151 log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead.");
1152 arg_clone_ns_flags = 0;
1153 break;
1154
1155 case ARG_REGISTER:
1156 r = parse_boolean(optarg);
1157 if (r < 0) {
1158 log_error("Failed to parse --register= argument: %s", optarg);
1159 return r;
1160 }
1161
1162 arg_register = r;
1163 break;
1164
1165 case ARG_KEEP_UNIT:
1166 arg_keep_unit = true;
1167 break;
1168
1169 case ARG_PERSONALITY:
1170
1171 arg_personality = personality_from_string(optarg);
1172 if (arg_personality == PERSONALITY_INVALID)
1173 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1174 "Unknown or unsupported personality '%s'.", optarg);
1175
1176 arg_settings_mask |= SETTING_PERSONALITY;
1177 break;
1178
1179 case ARG_VOLATILE:
1180
1181 if (!optarg)
1182 arg_volatile_mode = VOLATILE_YES;
1183 else if (streq(optarg, "help")) {
1184 DUMP_STRING_TABLE(volatile_mode, VolatileMode, _VOLATILE_MODE_MAX);
1185 return 0;
1186 } else {
1187 VolatileMode m;
1188
1189 m = volatile_mode_from_string(optarg);
1190 if (m < 0)
1191 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1192 "Failed to parse --volatile= argument: %s", optarg);
1193 else
1194 arg_volatile_mode = m;
1195 }
1196
1197 arg_settings_mask |= SETTING_VOLATILE_MODE;
1198 break;
1199
1200 case 'p':
1201 r = expose_port_parse(&arg_expose_ports, optarg);
1202 if (r == -EEXIST)
1203 return log_error_errno(r, "Duplicate port specification: %s", optarg);
1204 if (r < 0)
1205 return log_error_errno(r, "Failed to parse host port %s: %m", optarg);
1206
1207 arg_settings_mask |= SETTING_EXPOSE_PORTS;
1208 break;
1209
1210 case ARG_PROPERTY:
1211 if (strv_extend(&arg_property, optarg) < 0)
1212 return log_oom();
1213
1214 break;
1215
1216 case ARG_PRIVATE_USERS: {
1217 int boolean;
1218
1219 if (!optarg)
1220 boolean = true;
1221 else if (!in_charset(optarg, DIGITS))
1222 /* do *not* parse numbers as booleans */
1223 boolean = parse_boolean(optarg);
1224 else
1225 boolean = -1;
1226
1227 if (boolean == 0) {
1228 /* no: User namespacing off */
1229 arg_userns_mode = USER_NAMESPACE_NO;
1230 arg_uid_shift = UID_INVALID;
1231 arg_uid_range = UINT32_C(0x10000);
1232 } else if (boolean > 0) {
1233 /* yes: User namespacing on, UID range is read from root dir */
1234 arg_userns_mode = USER_NAMESPACE_FIXED;
1235 arg_uid_shift = UID_INVALID;
1236 arg_uid_range = UINT32_C(0x10000);
1237 } else if (streq(optarg, "pick")) {
1238 /* pick: User namespacing on, UID range is picked randomly */
1239 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1240 * implied by USER_NAMESPACE_PICK
1241 * further down. */
1242 arg_uid_shift = UID_INVALID;
1243 arg_uid_range = UINT32_C(0x10000);
1244
1245 } else if (streq(optarg, "identity")) {
1246 /* identitiy: User namespaces on, UID range is map the 0…0xFFFF range to
1247 * itself, i.e. we don't actually map anything, but do take benefit of
1248 * isolation of capability sets. */
1249 arg_userns_mode = USER_NAMESPACE_FIXED;
1250 arg_uid_shift = 0;
1251 arg_uid_range = UINT32_C(0x10000);
1252 } else {
1253 _cleanup_free_ char *buffer = NULL;
1254 const char *range, *shift;
1255
1256 /* anything else: User namespacing on, UID range is explicitly configured */
1257
1258 range = strchr(optarg, ':');
1259 if (range) {
1260 buffer = strndup(optarg, range - optarg);
1261 if (!buffer)
1262 return log_oom();
1263 shift = buffer;
1264
1265 range++;
1266 r = safe_atou32(range, &arg_uid_range);
1267 if (r < 0)
1268 return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range);
1269 } else
1270 shift = optarg;
1271
1272 r = parse_uid(shift, &arg_uid_shift);
1273 if (r < 0)
1274 return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg);
1275
1276 arg_userns_mode = USER_NAMESPACE_FIXED;
1277
1278 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
1279 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID range cannot be empty or go beyond " UID_FMT ".", UID_INVALID);
1280 }
1281
1282 arg_settings_mask |= SETTING_USERNS;
1283 break;
1284 }
1285
1286 case 'U':
1287 if (userns_supported()) {
1288 arg_userns_mode = USER_NAMESPACE_PICK; /* Note that arg_userns_ownership is
1289 * implied by USER_NAMESPACE_PICK
1290 * further down. */
1291 arg_uid_shift = UID_INVALID;
1292 arg_uid_range = UINT32_C(0x10000);
1293
1294 arg_settings_mask |= SETTING_USERNS;
1295 }
1296
1297 break;
1298
1299 case ARG_PRIVATE_USERS_CHOWN:
1300 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
1301
1302 arg_settings_mask |= SETTING_USERNS;
1303 break;
1304
1305 case ARG_PRIVATE_USERS_OWNERSHIP:
1306 if (streq(optarg, "help")) {
1307 DUMP_STRING_TABLE(user_namespace_ownership, UserNamespaceOwnership, _USER_NAMESPACE_OWNERSHIP_MAX);
1308 return 0;
1309 }
1310
1311 arg_userns_ownership = user_namespace_ownership_from_string(optarg);
1312 if (arg_userns_ownership < 0)
1313 return log_error_errno(arg_userns_ownership, "Cannot parse --user-namespace-ownership= value: %s", optarg);
1314
1315 arg_settings_mask |= SETTING_USERNS;
1316 break;
1317
1318 case ARG_KILL_SIGNAL:
1319 if (streq(optarg, "help")) {
1320 DUMP_STRING_TABLE(signal, int, _NSIG);
1321 return 0;
1322 }
1323
1324 arg_kill_signal = signal_from_string(optarg);
1325 if (arg_kill_signal < 0)
1326 return log_error_errno(arg_kill_signal, "Cannot parse signal: %s", optarg);
1327
1328 arg_settings_mask |= SETTING_KILL_SIGNAL;
1329 break;
1330
1331 case ARG_SETTINGS:
1332
1333 /* no → do not read files
1334 * yes → read files, do not override cmdline, trust only subset
1335 * override → read files, override cmdline, trust only subset
1336 * trusted → read files, do not override cmdline, trust all
1337 */
1338
1339 r = parse_boolean(optarg);
1340 if (r < 0) {
1341 if (streq(optarg, "trusted")) {
1342 mask_all_settings = false;
1343 mask_no_settings = false;
1344 arg_settings_trusted = true;
1345
1346 } else if (streq(optarg, "override")) {
1347 mask_all_settings = false;
1348 mask_no_settings = true;
1349 arg_settings_trusted = -1;
1350 } else
1351 return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg);
1352 } else if (r > 0) {
1353 /* yes */
1354 mask_all_settings = false;
1355 mask_no_settings = false;
1356 arg_settings_trusted = -1;
1357 } else {
1358 /* no */
1359 mask_all_settings = true;
1360 mask_no_settings = false;
1361 arg_settings_trusted = false;
1362 }
1363
1364 break;
1365
1366 case ARG_CHDIR:
1367 if (!path_is_absolute(optarg))
1368 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1369 "Working directory %s is not an absolute path.", optarg);
1370
1371 r = free_and_strdup(&arg_chdir, optarg);
1372 if (r < 0)
1373 return log_oom();
1374
1375 arg_settings_mask |= SETTING_WORKING_DIRECTORY;
1376 break;
1377
1378 case ARG_PIVOT_ROOT:
1379 r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg);
1380 if (r < 0)
1381 return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg);
1382
1383 arg_settings_mask |= SETTING_PIVOT_ROOT;
1384 break;
1385
1386 case ARG_NOTIFY_READY:
1387 r = parse_boolean(optarg);
1388 if (r < 0)
1389 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1390 "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg);
1391 arg_notify_ready = r;
1392 arg_settings_mask |= SETTING_NOTIFY_READY;
1393 break;
1394
1395 case ARG_ROOT_HASH: {
1396 _cleanup_free_ void *k = NULL;
1397 size_t l;
1398
1399 r = unhexmem(optarg, strlen(optarg), &k, &l);
1400 if (r < 0)
1401 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
1402 if (l < sizeof(sd_id128_t))
1403 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg);
1404
1405 free_and_replace(arg_verity_settings.root_hash, k);
1406 arg_verity_settings.root_hash_size = l;
1407 break;
1408 }
1409
1410 case ARG_ROOT_HASH_SIG: {
1411 char *value;
1412 size_t l;
1413 void *p;
1414
1415 if ((value = startswith(optarg, "base64:"))) {
1416 r = unbase64mem(value, strlen(value), &p, &l);
1417 if (r < 0)
1418 return log_error_errno(r, "Failed to parse root hash signature '%s': %m", optarg);
1419
1420 } else {
1421 r = read_full_file(optarg, (char**) &p, &l);
1422 if (r < 0)
1423 return log_error_errno(r, "Failed parse root hash signature file '%s': %m", optarg);
1424 }
1425
1426 free_and_replace(arg_verity_settings.root_hash_sig, p);
1427 arg_verity_settings.root_hash_sig_size = l;
1428 break;
1429 }
1430
1431 case ARG_VERITY_DATA:
1432 r = parse_path_argument(optarg, false, &arg_verity_settings.data_path);
1433 if (r < 0)
1434 return r;
1435 break;
1436
1437 case ARG_SYSTEM_CALL_FILTER: {
1438 bool negative;
1439 const char *items;
1440
1441 negative = optarg[0] == '~';
1442 items = negative ? optarg + 1 : optarg;
1443
1444 for (;;) {
1445 _cleanup_free_ char *word = NULL;
1446
1447 r = extract_first_word(&items, &word, NULL, 0);
1448 if (r == 0)
1449 break;
1450 if (r == -ENOMEM)
1451 return log_oom();
1452 if (r < 0)
1453 return log_error_errno(r, "Failed to parse system call filter: %m");
1454
1455 if (negative)
1456 r = strv_extend(&arg_syscall_deny_list, word);
1457 else
1458 r = strv_extend(&arg_syscall_allow_list, word);
1459 if (r < 0)
1460 return log_oom();
1461 }
1462
1463 arg_settings_mask |= SETTING_SYSCALL_FILTER;
1464 break;
1465 }
1466
1467 case ARG_RLIMIT: {
1468 const char *eq;
1469 _cleanup_free_ char *name = NULL;
1470 int rl;
1471
1472 if (streq(optarg, "help")) {
1473 DUMP_STRING_TABLE(rlimit, int, _RLIMIT_MAX);
1474 return 0;
1475 }
1476
1477 eq = strchr(optarg, '=');
1478 if (!eq)
1479 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1480 "--rlimit= expects an '=' assignment.");
1481
1482 name = strndup(optarg, eq - optarg);
1483 if (!name)
1484 return log_oom();
1485
1486 rl = rlimit_from_string_harder(name);
1487 if (rl < 0)
1488 return log_error_errno(rl, "Unknown resource limit: %s", name);
1489
1490 if (!arg_rlimit[rl]) {
1491 arg_rlimit[rl] = new0(struct rlimit, 1);
1492 if (!arg_rlimit[rl])
1493 return log_oom();
1494 }
1495
1496 r = rlimit_parse(rl, eq + 1, arg_rlimit[rl]);
1497 if (r < 0)
1498 return log_error_errno(r, "Failed to parse resource limit: %s", eq + 1);
1499
1500 arg_settings_mask |= SETTING_RLIMIT_FIRST << rl;
1501 break;
1502 }
1503
1504 case ARG_OOM_SCORE_ADJUST:
1505 r = parse_oom_score_adjust(optarg, &arg_oom_score_adjust);
1506 if (r < 0)
1507 return log_error_errno(r, "Failed to parse --oom-score-adjust= parameter: %s", optarg);
1508
1509 arg_oom_score_adjust_set = true;
1510 arg_settings_mask |= SETTING_OOM_SCORE_ADJUST;
1511 break;
1512
1513 case ARG_CPU_AFFINITY: {
1514 CPUSet cpuset;
1515
1516 r = parse_cpu_set(optarg, &cpuset);
1517 if (r < 0)
1518 return log_error_errno(r, "Failed to parse CPU affinity mask %s: %m", optarg);
1519
1520 cpu_set_reset(&arg_cpu_set);
1521 arg_cpu_set = cpuset;
1522 arg_settings_mask |= SETTING_CPU_AFFINITY;
1523 break;
1524 }
1525
1526 case ARG_RESOLV_CONF:
1527 if (streq(optarg, "help")) {
1528 DUMP_STRING_TABLE(resolv_conf_mode, ResolvConfMode, _RESOLV_CONF_MODE_MAX);
1529 return 0;
1530 }
1531
1532 arg_resolv_conf = resolv_conf_mode_from_string(optarg);
1533 if (arg_resolv_conf < 0)
1534 return log_error_errno(arg_resolv_conf,
1535 "Failed to parse /etc/resolv.conf mode: %s", optarg);
1536
1537 arg_settings_mask |= SETTING_RESOLV_CONF;
1538 break;
1539
1540 case ARG_TIMEZONE:
1541 if (streq(optarg, "help")) {
1542 DUMP_STRING_TABLE(timezone_mode, TimezoneMode, _TIMEZONE_MODE_MAX);
1543 return 0;
1544 }
1545
1546 arg_timezone = timezone_mode_from_string(optarg);
1547 if (arg_timezone < 0)
1548 return log_error_errno(arg_timezone,
1549 "Failed to parse /etc/localtime mode: %s", optarg);
1550
1551 arg_settings_mask |= SETTING_TIMEZONE;
1552 break;
1553
1554 case ARG_CONSOLE:
1555 r = handle_arg_console(optarg);
1556 if (r <= 0)
1557 return r;
1558 break;
1559
1560 case 'P':
1561 case ARG_PIPE:
1562 r = handle_arg_console("pipe");
1563 if (r <= 0)
1564 return r;
1565 break;
1566
1567 case ARG_NO_PAGER:
1568 arg_pager_flags |= PAGER_DISABLE;
1569 break;
1570
1571 case ARG_SET_CREDENTIAL: {
1572 _cleanup_free_ char *word = NULL, *data = NULL;
1573 const char *p = optarg;
1574 Credential *a;
1575 ssize_t l;
1576
1577 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1578 if (r == -ENOMEM)
1579 return log_oom();
1580 if (r < 0)
1581 return log_error_errno(r, "Failed to parse --set-credential= parameter: %m");
1582 if (r == 0 || !p)
1583 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --set-credential=: %s", optarg);
1584
1585 if (!credential_name_valid(word))
1586 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1587
1588 for (size_t i = 0; i < arg_n_credentials; i++)
1589 if (streq(arg_credentials[i].id, word))
1590 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1591
1592 l = cunescape(p, UNESCAPE_ACCEPT_NUL, &data);
1593 if (l < 0)
1594 return log_error_errno(l, "Failed to unescape credential data: %s", p);
1595
1596 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1597 if (!a)
1598 return log_oom();
1599
1600 a[arg_n_credentials++] = (Credential) {
1601 .id = TAKE_PTR(word),
1602 .data = TAKE_PTR(data),
1603 .size = l,
1604 };
1605
1606 arg_credentials = a;
1607
1608 arg_settings_mask |= SETTING_CREDENTIALS;
1609 break;
1610 }
1611
1612 case ARG_LOAD_CREDENTIAL: {
1613 ReadFullFileFlags flags = READ_FULL_FILE_SECURE;
1614 _cleanup_(erase_and_freep) char *data = NULL;
1615 _cleanup_free_ char *word = NULL, *j = NULL;
1616 const char *p = optarg;
1617 Credential *a;
1618 size_t size, i;
1619
1620 r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
1621 if (r == -ENOMEM)
1622 return log_oom();
1623 if (r < 0)
1624 return log_error_errno(r, "Failed to parse --set-credential= parameter: %m");
1625 if (r == 0 || !p)
1626 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Missing value for --set-credential=: %s", optarg);
1627
1628 if (!credential_name_valid(word))
1629 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Credential name is not valid: %s", word);
1630
1631 for (i = 0; i < arg_n_credentials; i++)
1632 if (streq(arg_credentials[i].id, word))
1633 return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "Duplicate credential '%s', refusing.", word);
1634
1635 if (path_is_absolute(p))
1636 flags |= READ_FULL_FILE_CONNECT_SOCKET;
1637 else {
1638 const char *e;
1639
1640 r = get_credentials_dir(&e);
1641 if (r < 0)
1642 return log_error_errno(r, "Credential not available (no credentials passed at all): %s", word);
1643
1644 j = path_join(e, p);
1645 if (!j)
1646 return log_oom();
1647 }
1648
1649 r = read_full_file_full(AT_FDCWD, j ?: p, UINT64_MAX, SIZE_MAX,
1650 flags,
1651 NULL,
1652 &data, &size);
1653 if (r < 0)
1654 return log_error_errno(r, "Failed to read credential '%s': %m", j ?: p);
1655
1656 a = reallocarray(arg_credentials, arg_n_credentials + 1, sizeof(Credential));
1657 if (!a)
1658 return log_oom();
1659
1660 a[arg_n_credentials++] = (Credential) {
1661 .id = TAKE_PTR(word),
1662 .data = TAKE_PTR(data),
1663 .size = size,
1664 };
1665
1666 arg_credentials = a;
1667
1668 arg_settings_mask |= SETTING_CREDENTIALS;
1669 break;
1670 }
1671
1672 case ARG_BIND_USER:
1673 if (!valid_user_group_name(optarg, 0))
1674 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid user name to bind: %s", optarg);
1675
1676 if (strv_extend(&arg_bind_user, optarg) < 0)
1677 return log_oom();
1678
1679 arg_settings_mask |= SETTING_BIND_USER;
1680 break;
1681
1682 case ARG_SUPPRESS_SYNC:
1683 r = parse_boolean_argument("--suppress-sync=", optarg, &arg_suppress_sync);
1684 if (r < 0)
1685 return r;
1686
1687 arg_settings_mask |= SETTING_SUPPRESS_SYNC;
1688 break;
1689
1690 case '?':
1691 return -EINVAL;
1692
1693 default:
1694 assert_not_reached();
1695 }
1696
1697 if (argc > optind) {
1698 strv_free(arg_parameters);
1699 arg_parameters = strv_copy(argv + optind);
1700 if (!arg_parameters)
1701 return log_oom();
1702
1703 arg_settings_mask |= SETTING_START_MODE;
1704 }
1705
1706 if (arg_ephemeral && arg_template && !arg_directory)
1707 /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically
1708 * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's
1709 * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral
1710 * --directory=". */
1711 arg_directory = TAKE_PTR(arg_template);
1712
1713 arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? UINT64_C(1) << CAP_NET_ADMIN : 0)) & ~minus;
1714
1715 /* Make sure to parse environment before we reset the settings mask below */
1716 r = parse_environment();
1717 if (r < 0)
1718 return r;
1719
1720 /* Load all settings from .nspawn files */
1721 if (mask_no_settings)
1722 arg_settings_mask = 0;
1723
1724 /* Don't load any settings from .nspawn files */
1725 if (mask_all_settings)
1726 arg_settings_mask = _SETTINGS_MASK_ALL;
1727
1728 return 1;
1729 }
1730
1731 static int verify_arguments(void) {
1732 int r;
1733
1734 if (arg_start_mode == START_PID2 && arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
1735 /* If we are running the stub init in the container, we don't need to look at what the init
1736 * in the container supports, because we are not using it. Let's immediately pick the right
1737 * setting based on the host system configuration.
1738 *
1739 * We only do this, if the user didn't use an environment variable to override the detection.
1740 */
1741
1742 r = cg_all_unified();
1743 if (r < 0)
1744 return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
1745 if (r > 0)
1746 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
1747 else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)
1748 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
1749 else
1750 arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
1751 }
1752
1753 if (arg_userns_mode != USER_NAMESPACE_NO)
1754 arg_mount_settings |= MOUNT_USE_USERNS;
1755
1756 if (arg_private_network)
1757 arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS;
1758
1759 if (!(arg_clone_ns_flags & CLONE_NEWPID) ||
1760 !(arg_clone_ns_flags & CLONE_NEWUTS)) {
1761 arg_register = false;
1762 if (arg_start_mode != START_PID1)
1763 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--boot cannot be used without namespacing.");
1764 }
1765
1766 if (arg_userns_ownership < 0)
1767 arg_userns_ownership =
1768 arg_userns_mode == USER_NAMESPACE_PICK ? USER_NAMESPACE_OWNERSHIP_AUTO :
1769 USER_NAMESPACE_OWNERSHIP_OFF;
1770
1771 if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
1772 arg_kill_signal = SIGRTMIN+3;
1773
1774 if (arg_volatile_mode != VOLATILE_NO) /* Make sure all file systems contained in the image are mounted read-only if we are in volatile mode */
1775 arg_read_only = true;
1776
1777 if (has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts))
1778 arg_read_only = true;
1779
1780 if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0)
1781 /* Save the user from accidentally registering either user-$SESSION.scope or user@.service.
1782 * The latter is not technically a user session, but we don't need to labour the point. */
1783 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--keep-unit --register=yes may not be used when invoked from a user session.");
1784
1785 if (arg_directory && arg_image)
1786 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--directory= and --image= may not be combined.");
1787
1788 if (arg_template && arg_image)
1789 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= and --image= may not be combined.");
1790
1791 if (arg_template && !(arg_directory || arg_machine))
1792 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= needs --directory= or --machine=.");
1793
1794 if (arg_ephemeral && arg_template)
1795 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined.");
1796
1797 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO))
1798 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined.");
1799
1800 if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported())
1801 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support.");
1802
1803 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_read_only)
1804 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1805 "--read-only and --private-users-ownership=chown may not be combined.");
1806
1807 /* We don't support --private-users-ownership=chown together with any of the volatile modes since we
1808 * couldn't change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a
1809 * massive copy-up (in case of overlay) making the entire exercise pointless. */
1810 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_CHOWN && arg_volatile_mode != VOLATILE_NO)
1811 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--volatile= and --private-users-ownership=chown may not be combined.");
1812
1813 /* If --network-namespace-path is given with any other network-related option (except --private-network),
1814 * we need to error out, to avoid conflicts between different network options. */
1815 if (arg_network_namespace_path &&
1816 (arg_network_interfaces || arg_network_macvlan ||
1817 arg_network_ipvlan || arg_network_veth_extra ||
1818 arg_network_bridge || arg_network_zone ||
1819 arg_network_veth))
1820 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--network-namespace-path= cannot be combined with other network options.");
1821
1822 if (arg_network_bridge && arg_network_zone)
1823 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1824 "--network-bridge= and --network-zone= may not be combined.");
1825
1826 if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network)
1827 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network.");
1828
1829 if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO))
1830 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot combine --private-users with read-write mounts.");
1831
1832 if (arg_expose_ports && !arg_private_network)
1833 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot use --port= without private networking.");
1834
1835 if (arg_caps_ambient) {
1836 if (arg_caps_ambient == UINT64_MAX)
1837 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= does not support the value all.");
1838
1839 if ((arg_caps_ambient & arg_caps_retain) != arg_caps_ambient)
1840 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not fully covered by Capability= setting.");
1841
1842 if (arg_start_mode == START_BOOT)
1843 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "AmbientCapability= setting is not useful for boot mode.");
1844 }
1845
1846 if (arg_userns_mode == USER_NAMESPACE_NO && !strv_isempty(arg_bind_user))
1847 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--bind-user= requires --private-users");
1848
1849 /* Drop duplicate --bind-user= entries */
1850 strv_uniq(arg_bind_user);
1851
1852 r = custom_mount_check_all();
1853 if (r < 0)
1854 return r;
1855
1856 return 0;
1857 }
1858
1859 int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1860 assert(p);
1861
1862 if (arg_userns_mode == USER_NAMESPACE_NO)
1863 return 0;
1864
1865 if (uid == UID_INVALID && gid == GID_INVALID)
1866 return 0;
1867
1868 if (uid != UID_INVALID) {
1869 uid += arg_uid_shift;
1870
1871 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1872 return -EOVERFLOW;
1873 }
1874
1875 if (gid != GID_INVALID) {
1876 gid += (gid_t) arg_uid_shift;
1877
1878 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1879 return -EOVERFLOW;
1880 }
1881
1882 return RET_NERRNO(lchown(p, uid, gid));
1883 }
1884
1885 int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1886 const char *q;
1887 int r;
1888
1889 q = prefix_roota(root, path);
1890 r = RET_NERRNO(mkdir(q, mode));
1891 if (r == -EEXIST)
1892 return 0;
1893 if (r < 0)
1894 return r;
1895
1896 return userns_lchown(q, uid, gid);
1897 }
1898
1899 static const char *timezone_from_path(const char *path) {
1900 return PATH_STARTSWITH_SET(
1901 path,
1902 "../usr/share/zoneinfo/",
1903 "/usr/share/zoneinfo/");
1904 }
1905
1906 static bool etc_writable(void) {
1907 return !arg_read_only || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY);
1908 }
1909
1910 static int setup_timezone(const char *dest) {
1911 _cleanup_free_ char *p = NULL, *etc = NULL;
1912 const char *where, *check;
1913 TimezoneMode m;
1914 int r;
1915
1916 assert(dest);
1917
1918 if (IN_SET(arg_timezone, TIMEZONE_AUTO, TIMEZONE_SYMLINK)) {
1919 r = readlink_malloc("/etc/localtime", &p);
1920 if (r == -ENOENT && arg_timezone == TIMEZONE_AUTO)
1921 m = etc_writable() ? TIMEZONE_DELETE : TIMEZONE_OFF;
1922 else if (r == -EINVAL && arg_timezone == TIMEZONE_AUTO) /* regular file? */
1923 m = etc_writable() ? TIMEZONE_COPY : TIMEZONE_BIND;
1924 else if (r < 0) {
1925 log_warning_errno(r, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m");
1926 /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data
1927 * file.
1928 *
1929 * Example:
1930 * ln -s /usr/share/zoneinfo/UTC /etc/localtime
1931 */
1932 return 0;
1933 } else if (arg_timezone == TIMEZONE_AUTO)
1934 m = etc_writable() ? TIMEZONE_SYMLINK : TIMEZONE_BIND;
1935 else
1936 m = arg_timezone;
1937 } else
1938 m = arg_timezone;
1939
1940 if (m == TIMEZONE_OFF)
1941 return 0;
1942
1943 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
1944 if (r < 0) {
1945 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
1946 return 0;
1947 }
1948
1949 where = strjoina(etc, "/localtime");
1950
1951 switch (m) {
1952
1953 case TIMEZONE_DELETE:
1954 if (unlink(where) < 0)
1955 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
1956
1957 return 0;
1958
1959 case TIMEZONE_SYMLINK: {
1960 _cleanup_free_ char *q = NULL;
1961 const char *z, *what;
1962
1963 z = timezone_from_path(p);
1964 if (!z) {
1965 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1966 return 0;
1967 }
1968
1969 r = readlink_malloc(where, &q);
1970 if (r >= 0 && streq_ptr(timezone_from_path(q), z))
1971 return 0; /* Already pointing to the right place? Then do nothing .. */
1972
1973 check = strjoina(dest, "/usr/share/zoneinfo/", z);
1974 r = chase_symlinks(check, dest, 0, NULL, NULL);
1975 if (r < 0)
1976 log_debug_errno(r, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z);
1977 else {
1978 if (unlink(where) < 0 && errno != ENOENT) {
1979 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */
1980 errno, "Failed to remove existing timezone info %s in container, ignoring: %m", where);
1981 return 0;
1982 }
1983
1984 what = strjoina("../usr/share/zoneinfo/", z);
1985 if (symlink(what, where) < 0) {
1986 log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING,
1987 errno, "Failed to correct timezone of container, ignoring: %m");
1988 return 0;
1989 }
1990
1991 break;
1992 }
1993
1994 _fallthrough_;
1995 }
1996
1997 case TIMEZONE_BIND: {
1998 _cleanup_free_ char *resolved = NULL;
1999 int found;
2000
2001 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
2002 if (found < 0) {
2003 log_warning_errno(found, "Failed to resolve /etc/localtime path in container, ignoring: %m");
2004 return 0;
2005 }
2006
2007 if (found == 0) /* missing? */
2008 (void) touch(resolved);
2009
2010 r = mount_nofollow_verbose(LOG_WARNING, "/etc/localtime", resolved, NULL, MS_BIND, NULL);
2011 if (r >= 0)
2012 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
2013
2014 _fallthrough_;
2015 }
2016
2017 case TIMEZONE_COPY:
2018 /* If mounting failed, try to copy */
2019 r = copy_file_atomic("/etc/localtime", where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
2020 if (r < 0) {
2021 log_full_errno(IN_SET(r, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
2022 "Failed to copy /etc/localtime to %s, ignoring: %m", where);
2023 return 0;
2024 }
2025
2026 break;
2027
2028 default:
2029 assert_not_reached();
2030 }
2031
2032 /* Fix permissions of the symlink or file copy we just created */
2033 r = userns_lchown(where, 0, 0);
2034 if (r < 0)
2035 log_warning_errno(r, "Failed to chown /etc/localtime, ignoring: %m");
2036
2037 return 0;
2038 }
2039
2040 static int have_resolv_conf(const char *path) {
2041 assert(path);
2042
2043 if (access(path, F_OK) < 0) {
2044 if (errno == ENOENT)
2045 return 0;
2046
2047 return log_debug_errno(errno, "Failed to determine whether '%s' is available: %m", path);
2048 }
2049
2050 return 1;
2051 }
2052
2053 static int resolved_listening(void) {
2054 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2055 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
2056 _cleanup_free_ char *dns_stub_listener_mode = NULL;
2057 int r;
2058
2059 /* Check if resolved is listening */
2060
2061 r = sd_bus_open_system(&bus);
2062 if (r < 0)
2063 return log_debug_errno(r, "Failed to open system bus: %m");
2064
2065 r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL);
2066 if (r < 0)
2067 return log_debug_errno(r, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m");
2068 if (r == 0)
2069 return 0;
2070
2071 r = sd_bus_get_property_string(bus,
2072 "org.freedesktop.resolve1",
2073 "/org/freedesktop/resolve1",
2074 "org.freedesktop.resolve1.Manager",
2075 "DNSStubListener",
2076 &error,
2077 &dns_stub_listener_mode);
2078 if (r < 0)
2079 return log_debug_errno(r, "Failed to query DNSStubListener property: %s", bus_error_message(&error, r));
2080
2081 return STR_IN_SET(dns_stub_listener_mode, "udp", "yes");
2082 }
2083
2084 static int setup_resolv_conf(const char *dest) {
2085 _cleanup_free_ char *etc = NULL;
2086 const char *where, *what;
2087 ResolvConfMode m;
2088 int r;
2089
2090 assert(dest);
2091
2092 if (arg_resolv_conf == RESOLV_CONF_AUTO) {
2093 if (arg_private_network)
2094 m = RESOLV_CONF_OFF;
2095 else if (have_resolv_conf(PRIVATE_STUB_RESOLV_CONF) > 0 && resolved_listening() > 0)
2096 m = etc_writable() ? RESOLV_CONF_COPY_STUB : RESOLV_CONF_BIND_STUB;
2097 else if (have_resolv_conf("/etc/resolv.conf") > 0)
2098 m = etc_writable() ? RESOLV_CONF_COPY_HOST : RESOLV_CONF_BIND_HOST;
2099 else
2100 m = etc_writable() ? RESOLV_CONF_DELETE : RESOLV_CONF_OFF;
2101
2102 } else
2103 m = arg_resolv_conf;
2104
2105 if (m == RESOLV_CONF_OFF)
2106 return 0;
2107
2108 r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc, NULL);
2109 if (r < 0) {
2110 log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m");
2111 return 0;
2112 }
2113
2114 where = strjoina(etc, "/resolv.conf");
2115
2116 if (m == RESOLV_CONF_DELETE) {
2117 if (unlink(where) < 0)
2118 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where);
2119
2120 return 0;
2121 }
2122
2123 if (IN_SET(m, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_COPY_STATIC))
2124 what = PRIVATE_STATIC_RESOLV_CONF;
2125 else if (IN_SET(m, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_COPY_UPLINK))
2126 what = PRIVATE_UPLINK_RESOLV_CONF;
2127 else if (IN_SET(m, RESOLV_CONF_BIND_STUB, RESOLV_CONF_REPLACE_STUB, RESOLV_CONF_COPY_STUB))
2128 what = PRIVATE_STUB_RESOLV_CONF;
2129 else
2130 what = "/etc/resolv.conf";
2131
2132 if (IN_SET(m, RESOLV_CONF_BIND_HOST, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_BIND_UPLINK, RESOLV_CONF_BIND_STUB)) {
2133 _cleanup_free_ char *resolved = NULL;
2134 int found;
2135
2136 found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved, NULL);
2137 if (found < 0) {
2138 log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m");
2139 return 0;
2140 }
2141
2142 if (found == 0) /* missing? */
2143 (void) touch(resolved);
2144
2145 r = mount_nofollow_verbose(LOG_WARNING, what, resolved, NULL, MS_BIND, NULL);
2146 if (r >= 0)
2147 return mount_nofollow_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL);
2148
2149 /* If that didn't work, let's copy the file */
2150 }
2151
2152 if (IN_SET(m, RESOLV_CONF_REPLACE_HOST, RESOLV_CONF_REPLACE_STATIC, RESOLV_CONF_REPLACE_UPLINK, RESOLV_CONF_REPLACE_STUB))
2153 r = copy_file_atomic(what, where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE);
2154 else
2155 r = copy_file(what, where, O_TRUNC|O_NOFOLLOW, 0644, 0, 0, COPY_REFLINK);
2156 if (r < 0) {
2157 /* If the file already exists as symlink, let's suppress the warning, under the assumption that
2158 * resolved or something similar runs inside and the symlink points there.
2159 *
2160 * If the disk image is read-only, there's also no point in complaining.
2161 */
2162 log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST, RESOLV_CONF_COPY_STATIC, RESOLV_CONF_COPY_UPLINK, RESOLV_CONF_COPY_STUB) &&
2163 IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
2164 "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where);
2165 return 0;
2166 }
2167
2168 r = userns_lchown(where, 0, 0);
2169 if (r < 0)
2170 log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m");
2171
2172 return 0;
2173 }
2174
2175 static int setup_boot_id(void) {
2176 _cleanup_(unlink_and_freep) char *from = NULL;
2177 _cleanup_free_ char *path = NULL;
2178 sd_id128_t rnd = SD_ID128_NULL;
2179 const char *to;
2180 int r;
2181
2182 /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */
2183
2184 r = tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path);
2185 if (r < 0)
2186 return log_error_errno(r, "Failed to generate random boot ID path: %m");
2187
2188 r = sd_id128_randomize(&rnd);
2189 if (r < 0)
2190 return log_error_errno(r, "Failed to generate random boot id: %m");
2191
2192 r = id128_write(path, ID128_UUID, rnd, false);
2193 if (r < 0)
2194 return log_error_errno(r, "Failed to write boot id: %m");
2195
2196 from = TAKE_PTR(path);
2197 to = "/proc/sys/kernel/random/boot_id";
2198
2199 r = mount_nofollow_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL);
2200 if (r < 0)
2201 return r;
2202
2203 return mount_nofollow_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
2204 }
2205
2206 static int copy_devnodes(const char *dest) {
2207 static const char devnodes[] =
2208 "null\0"
2209 "zero\0"
2210 "full\0"
2211 "random\0"
2212 "urandom\0"
2213 "tty\0"
2214 "net/tun\0";
2215
2216 const char *d;
2217 int r = 0;
2218
2219 assert(dest);
2220
2221 BLOCK_WITH_UMASK(0000);
2222
2223 /* Create /dev/net, so that we can create /dev/net/tun in it */
2224 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
2225 return log_error_errno(r, "Failed to create /dev/net directory: %m");
2226
2227 NULSTR_FOREACH(d, devnodes) {
2228 _cleanup_free_ char *from = NULL, *to = NULL;
2229 struct stat st;
2230
2231 from = path_join("/dev/", d);
2232 if (!from)
2233 return log_oom();
2234
2235 to = path_join(dest, from);
2236 if (!to)
2237 return log_oom();
2238
2239 if (stat(from, &st) < 0) {
2240
2241 if (errno != ENOENT)
2242 return log_error_errno(errno, "Failed to stat %s: %m", from);
2243
2244 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode))
2245 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2246 "%s is not a char or block device, cannot copy.", from);
2247 else {
2248 _cleanup_free_ char *sl = NULL, *prefixed = NULL, *dn = NULL, *t = NULL;
2249
2250 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
2251 /* Explicitly warn the user when /dev is already populated. */
2252 if (errno == EEXIST)
2253 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);
2254 if (errno != EPERM)
2255 return log_error_errno(errno, "mknod(%s) failed: %m", to);
2256
2257 /* Some systems abusively restrict mknod but allow bind mounts. */
2258 r = touch(to);
2259 if (r < 0)
2260 return log_error_errno(r, "touch (%s) failed: %m", to);
2261 r = mount_nofollow_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL);
2262 if (r < 0)
2263 return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to);
2264 }
2265
2266 r = userns_lchown(to, 0, 0);
2267 if (r < 0)
2268 return log_error_errno(r, "chown() of device node %s failed: %m", to);
2269
2270 dn = path_join("/dev", S_ISCHR(st.st_mode) ? "char" : "block");
2271 if (!dn)
2272 return log_oom();
2273
2274 r = userns_mkdir(dest, dn, 0755, 0, 0);
2275 if (r < 0)
2276 return log_error_errno(r, "Failed to create '%s': %m", dn);
2277
2278 if (asprintf(&sl, "%s/%u:%u", dn, major(st.st_rdev), minor(st.st_rdev)) < 0)
2279 return log_oom();
2280
2281 prefixed = path_join(dest, sl);
2282 if (!prefixed)
2283 return log_oom();
2284
2285 t = path_join("..", d);
2286 if (!t)
2287 return log_oom();
2288
2289 if (symlink(t, prefixed) < 0)
2290 log_debug_errno(errno, "Failed to symlink '%s' to '%s': %m", t, prefixed);
2291 }
2292 }
2293
2294 return r;
2295 }
2296
2297 static int make_extra_nodes(const char *dest) {
2298 size_t i;
2299 int r;
2300
2301 BLOCK_WITH_UMASK(0000);
2302
2303 for (i = 0; i < arg_n_extra_nodes; i++) {
2304 _cleanup_free_ char *path = NULL;
2305 DeviceNode *n = arg_extra_nodes + i;
2306
2307 path = path_join(dest, n->path);
2308 if (!path)
2309 return log_oom();
2310
2311 if (mknod(path, n->mode, S_ISCHR(n->mode) || S_ISBLK(n->mode) ? makedev(n->major, n->minor) : 0) < 0)
2312 return log_error_errno(errno, "Failed to create device node '%s': %m", path);
2313
2314 r = chmod_and_chown(path, n->mode, n->uid, n->gid);
2315 if (r < 0)
2316 return log_error_errno(r, "Failed to adjust device node ownership of '%s': %m", path);
2317 }
2318
2319 return 0;
2320 }
2321
2322 static int setup_pts(const char *dest) {
2323 _cleanup_free_ char *options = NULL;
2324 const char *p;
2325 int r;
2326
2327 #if HAVE_SELINUX
2328 if (arg_selinux_apifs_context)
2329 (void) asprintf(&options,
2330 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
2331 arg_uid_shift + TTY_GID,
2332 arg_selinux_apifs_context);
2333 else
2334 #endif
2335 (void) asprintf(&options,
2336 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
2337 arg_uid_shift + TTY_GID);
2338
2339 if (!options)
2340 return log_oom();
2341
2342 /* Mount /dev/pts itself */
2343 p = prefix_roota(dest, "/dev/pts");
2344 r = RET_NERRNO(mkdir(p, 0755));
2345 if (r < 0)
2346 return log_error_errno(r, "Failed to create /dev/pts: %m");
2347
2348 r = mount_nofollow_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options);
2349 if (r < 0)
2350 return r;
2351 r = userns_lchown(p, 0, 0);
2352 if (r < 0)
2353 return log_error_errno(r, "Failed to chown /dev/pts: %m");
2354
2355 /* Create /dev/ptmx symlink */
2356 p = prefix_roota(dest, "/dev/ptmx");
2357 if (symlink("pts/ptmx", p) < 0)
2358 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
2359 r = userns_lchown(p, 0, 0);
2360 if (r < 0)
2361 return log_error_errno(r, "Failed to chown /dev/ptmx: %m");
2362
2363 /* And fix /dev/pts/ptmx ownership */
2364 p = prefix_roota(dest, "/dev/pts/ptmx");
2365 r = userns_lchown(p, 0, 0);
2366 if (r < 0)
2367 return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m");
2368
2369 return 0;
2370 }
2371
2372 static int setup_stdio_as_dev_console(void) {
2373 _cleanup_close_ int terminal = -1;
2374 int r;
2375
2376 /* We open the TTY in O_NOCTTY mode, so that we do not become controller yet. We'll do that later
2377 * explicitly, if we are configured to. */
2378 terminal = open_terminal("/dev/console", O_RDWR|O_NOCTTY);
2379 if (terminal < 0)
2380 return log_error_errno(terminal, "Failed to open console: %m");
2381
2382 /* Make sure we can continue logging to the original stderr, even if
2383 * stderr points elsewhere now */
2384 r = log_dup_console();
2385 if (r < 0)
2386 return log_error_errno(r, "Failed to duplicate stderr: %m");
2387
2388 /* invalidates 'terminal' on success and failure */
2389 r = rearrange_stdio(terminal, terminal, terminal);
2390 TAKE_FD(terminal);
2391 if (r < 0)
2392 return log_error_errno(r, "Failed to move console to stdin/stdout/stderr: %m");
2393
2394 return 0;
2395 }
2396
2397 static int setup_dev_console(const char *console) {
2398 _cleanup_free_ char *p = NULL;
2399 int r;
2400
2401 /* Create /dev/console symlink */
2402 r = path_make_relative("/dev", console, &p);
2403 if (r < 0)
2404 return log_error_errno(r, "Failed to create relative path: %m");
2405
2406 if (symlink(p, "/dev/console") < 0)
2407 return log_error_errno(errno, "Failed to create /dev/console symlink: %m");
2408
2409 return 0;
2410 }
2411
2412 static int setup_keyring(void) {
2413 key_serial_t keyring;
2414
2415 /* Allocate a new session keyring for the container. This makes sure the keyring of the session
2416 * systemd-nspawn was invoked from doesn't leak into the container. Note that by default we block
2417 * keyctl() and request_key() anyway via seccomp so doing this operation isn't strictly necessary,
2418 * but in case people explicitly allow-list these system calls let's make sure we don't leak anything
2419 * into the container. */
2420
2421 keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
2422 if (keyring == -1) {
2423 if (errno == ENOSYS)
2424 log_debug_errno(errno, "Kernel keyring not supported, ignoring.");
2425 else if (ERRNO_IS_PRIVILEGE(errno))
2426 log_debug_errno(errno, "Kernel keyring access prohibited, ignoring.");
2427 else
2428 return log_error_errno(errno, "Setting up kernel keyring failed: %m");
2429 }
2430
2431 return 0;
2432 }
2433
2434 static int setup_credentials(const char *root) {
2435 const char *q;
2436 int r;
2437
2438 if (arg_n_credentials <= 0)
2439 return 0;
2440
2441 r = userns_mkdir(root, "/run/host", 0755, 0, 0);
2442 if (r < 0)
2443 return log_error_errno(r, "Failed to create /run/host: %m");
2444
2445 r = userns_mkdir(root, "/run/host/credentials", 0700, 0, 0);
2446 if (r < 0)
2447 return log_error_errno(r, "Failed to create /run/host/credentials: %m");
2448
2449 q = prefix_roota(root, "/run/host/credentials");
2450 r = mount_nofollow_verbose(LOG_ERR, NULL, q, "ramfs", MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0700");
2451 if (r < 0)
2452 return r;
2453
2454 for (size_t i = 0; i < arg_n_credentials; i++) {
2455 _cleanup_free_ char *j = NULL;
2456 _cleanup_close_ int fd = -1;
2457
2458 j = path_join(q, arg_credentials[i].id);
2459 if (!j)
2460 return log_oom();
2461
2462 fd = open(j, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC|O_NOFOLLOW, 0600);
2463 if (fd < 0)
2464 return log_error_errno(errno, "Failed to create credential file %s: %m", j);
2465
2466 r = loop_write(fd, arg_credentials[i].data, arg_credentials[i].size, /* do_poll= */ false);
2467 if (r < 0)
2468 return log_error_errno(r, "Failed to write credential to file %s: %m", j);
2469
2470 if (fchmod(fd, 0400) < 0)
2471 return log_error_errno(errno, "Failed to adjust access mode of %s: %m", j);
2472
2473 if (arg_userns_mode != USER_NAMESPACE_NO) {
2474 if (fchown(fd, arg_uid_shift, arg_uid_shift) < 0)
2475 return log_error_errno(errno, "Failed to adjust ownership of %s: %m", j);
2476 }
2477 }
2478
2479 if (chmod(q, 0500) < 0)
2480 return log_error_errno(errno, "Failed to adjust access mode of %s: %m", q);
2481
2482 r = userns_lchown(q, 0, 0);
2483 if (r < 0)
2484 return r;
2485
2486 /* Make both mount and superblock read-only now */
2487 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL);
2488 if (r < 0)
2489 return r;
2490
2491 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, "mode=0500");
2492 }
2493
2494 static int setup_kmsg(int kmsg_socket) {
2495 _cleanup_(unlink_and_freep) char *from = NULL;
2496 _cleanup_free_ char *fifo = NULL;
2497 _cleanup_close_ int fd = -1;
2498 int r;
2499
2500 assert(kmsg_socket >= 0);
2501
2502 BLOCK_WITH_UMASK(0000);
2503
2504 /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to
2505 * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves
2506 * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems
2507 * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */
2508
2509 r = tempfn_random_child("/run", "proc-kmsg", &fifo);
2510 if (r < 0)
2511 return log_error_errno(r, "Failed to generate kmsg path: %m");
2512
2513 if (mkfifo(fifo, 0600) < 0)
2514 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
2515
2516 from = TAKE_PTR(fifo);
2517
2518 r = mount_nofollow_verbose(LOG_ERR, from, "/proc/kmsg", NULL, MS_BIND, NULL);
2519 if (r < 0)
2520 return r;
2521
2522 fd = open(from, O_RDWR|O_NONBLOCK|O_CLOEXEC);
2523 if (fd < 0)
2524 return log_error_errno(errno, "Failed to open fifo: %m");
2525
2526 /* Store away the fd in the socket, so that it stays open as long as we run the child */
2527 r = send_one_fd(kmsg_socket, fd, 0);
2528 if (r < 0)
2529 return log_error_errno(r, "Failed to send FIFO fd: %m");
2530
2531 return 0;
2532 }
2533
2534 struct ExposeArgs {
2535 union in_addr_union address4;
2536 union in_addr_union address6;
2537 struct FirewallContext *fw_ctx;
2538 };
2539
2540 static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2541 struct ExposeArgs *args = userdata;
2542
2543 assert(rtnl);
2544 assert(m);
2545 assert(args);
2546
2547 (void) expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET, &args->address4);
2548 (void) expose_port_execute(rtnl, &args->fw_ctx, arg_expose_ports, AF_INET6, &args->address6);
2549 return 0;
2550 }
2551
2552 static int setup_hostname(void) {
2553 int r;
2554
2555 if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0)
2556 return 0;
2557
2558 r = sethostname_idempotent(arg_hostname ?: arg_machine);
2559 if (r < 0)
2560 return log_error_errno(r, "Failed to set hostname: %m");
2561
2562 return 0;
2563 }
2564
2565 static int setup_journal(const char *directory) {
2566 _cleanup_free_ char *d = NULL;
2567 const char *p, *q;
2568 sd_id128_t this_id;
2569 bool try;
2570 int r;
2571
2572 /* Don't link journals in ephemeral mode */
2573 if (arg_ephemeral)
2574 return 0;
2575
2576 if (arg_link_journal == LINK_NO)
2577 return 0;
2578
2579 try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
2580
2581 r = sd_id128_get_machine(&this_id);
2582 if (r < 0)
2583 return log_error_errno(r, "Failed to retrieve machine ID: %m");
2584
2585 if (sd_id128_equal(arg_uuid, this_id)) {
2586 log_full(try ? LOG_WARNING : LOG_ERR,
2587 "Host and machine ids are equal (%s): refusing to link journals", SD_ID128_TO_STRING(arg_uuid));
2588 if (try)
2589 return 0;
2590 return -EEXIST;
2591 }
2592
2593 FOREACH_STRING(dirname, "/var", "/var/log", "/var/log/journal") {
2594 r = userns_mkdir(directory, dirname, 0755, 0, 0);
2595 if (r < 0) {
2596 bool ignore = r == -EROFS && try;
2597 log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
2598 "Failed to create %s%s: %m", dirname, ignore ? ", ignoring" : "");
2599 return ignore ? 0 : r;
2600 }
2601 }
2602
2603 p = strjoina("/var/log/journal/", SD_ID128_TO_STRING(arg_uuid));
2604 q = prefix_roota(directory, p);
2605
2606 if (path_is_mount_point(p, NULL, 0) > 0) {
2607 if (try)
2608 return 0;
2609
2610 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2611 "%s: already a mount point, refusing to use for journal", p);
2612 }
2613
2614 if (path_is_mount_point(q, NULL, 0) > 0) {
2615 if (try)
2616 return 0;
2617
2618 return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
2619 "%s: already a mount point, refusing to use for journal", q);
2620 }
2621
2622 r = readlink_and_make_absolute(p, &d);
2623 if (r >= 0) {
2624 if (IN_SET(arg_link_journal, LINK_GUEST, LINK_AUTO) &&
2625 path_equal(d, q)) {
2626
2627 r = userns_mkdir(directory, p, 0755, 0, 0);
2628 if (r < 0)
2629 log_warning_errno(r, "Failed to create directory %s: %m", q);
2630 return 0;
2631 }
2632
2633 if (unlink(p) < 0)
2634 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
2635 } else if (r == -EINVAL) {
2636
2637 if (arg_link_journal == LINK_GUEST &&
2638 rmdir(p) < 0) {
2639
2640 if (errno == ENOTDIR) {
2641 log_error("%s already exists and is neither a symlink nor a directory", p);
2642 return r;
2643 } else
2644 return log_error_errno(errno, "Failed to remove %s: %m", p);
2645 }
2646 } else if (r != -ENOENT)
2647 return log_error_errno(r, "readlink(%s) failed: %m", p);
2648
2649 if (arg_link_journal == LINK_GUEST) {
2650
2651 if (symlink(q, p) < 0) {
2652 if (try) {
2653 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
2654 return 0;
2655 } else
2656 return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
2657 }
2658
2659 r = userns_mkdir(directory, p, 0755, 0, 0);
2660 if (r < 0)
2661 log_warning_errno(r, "Failed to create directory %s: %m", q);
2662 return 0;
2663 }
2664
2665 if (arg_link_journal == LINK_HOST) {
2666 /* don't create parents here — if the host doesn't have
2667 * permanent journal set up, don't force it here */
2668
2669 r = RET_NERRNO(mkdir(p, 0755));
2670 if (r < 0 && r != -EEXIST) {
2671 if (try) {
2672 log_debug_errno(r, "Failed to create %s, skipping journal setup: %m", p);
2673 return 0;
2674 } else
2675 return log_error_errno(r, "Failed to create %s: %m", p);
2676 }
2677
2678 } else if (access(p, F_OK) < 0)
2679 return 0;
2680
2681 if (dir_is_empty(q) == 0)
2682 log_warning("%s is not empty, proceeding anyway.", q);
2683
2684 r = userns_mkdir(directory, p, 0755, 0, 0);
2685 if (r < 0)
2686 return log_error_errno(r, "Failed to create %s: %m", q);
2687
2688 r = mount_nofollow_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL);
2689 if (r < 0)
2690 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
2691
2692 return 0;
2693 }
2694
2695 static int drop_capabilities(uid_t uid) {
2696 CapabilityQuintet q;
2697
2698 /* Let's initialize all five capability sets to something valid. If the quintet was configured via
2699 * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from
2700 * arg_caps_retain. */
2701
2702 if (capability_quintet_is_set(&arg_full_capabilities)) {
2703 q = arg_full_capabilities;
2704
2705 if (q.bounding == UINT64_MAX)
2706 q.bounding = uid == 0 ? arg_caps_retain : 0;
2707
2708 if (q.effective == UINT64_MAX)
2709 q.effective = uid == 0 ? q.bounding : 0;
2710
2711 if (q.inheritable == UINT64_MAX)
2712 q.inheritable = uid == 0 ? q.bounding : arg_caps_ambient;
2713
2714 if (q.permitted == UINT64_MAX)
2715 q.permitted = uid == 0 ? q.bounding : arg_caps_ambient;
2716
2717 if (q.ambient == UINT64_MAX && ambient_capabilities_supported())
2718 q.ambient = arg_caps_ambient;
2719
2720 if (capability_quintet_mangle(&q))
2721 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Cannot set capabilities that are not in the current bounding set.");
2722
2723 } else {
2724 q = (CapabilityQuintet) {
2725 .bounding = arg_caps_retain,
2726 .effective = uid == 0 ? arg_caps_retain : 0,
2727 .inheritable = uid == 0 ? arg_caps_retain : arg_caps_ambient,
2728 .permitted = uid == 0 ? arg_caps_retain : arg_caps_ambient,
2729 .ambient = ambient_capabilities_supported() ? arg_caps_ambient : UINT64_MAX,
2730 };
2731
2732 /* If we're not using OCI, proceed with mangled capabilities (so we don't error out)
2733 * in order to maintain the same behavior as systemd < 242. */
2734 if (capability_quintet_mangle(&q))
2735 log_full(arg_quiet ? LOG_DEBUG : LOG_WARNING,
2736 "Some capabilities will not be set because they are not in the current bounding set.");
2737
2738 }
2739
2740 return capability_quintet_enforce(&q);
2741 }
2742
2743 static int reset_audit_loginuid(void) {
2744 _cleanup_free_ char *p = NULL;
2745 int r;
2746
2747 if ((arg_clone_ns_flags & CLONE_NEWPID) == 0)
2748 return 0;
2749
2750 r = read_one_line_file("/proc/self/loginuid", &p);
2751 if (r == -ENOENT)
2752 return 0;
2753 if (r < 0)
2754 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
2755
2756 /* Already reset? */
2757 if (streq(p, "4294967295"))
2758 return 0;
2759
2760 r = write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER);
2761 if (r < 0) {
2762 log_error_errno(r,
2763 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2764 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2765 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2766 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2767 "using systemd-nspawn. Sleeping for 5s... (%m)");
2768
2769 sleep(5);
2770 }
2771
2772 return 0;
2773 }
2774
2775 static int setup_propagate(const char *root) {
2776 const char *p, *q;
2777 int r;
2778
2779 (void) mkdir_p("/run/systemd/nspawn/", 0755);
2780 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
2781 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
2782 (void) mkdir_p(p, 0600);
2783
2784 r = userns_mkdir(root, "/run/host", 0755, 0, 0);
2785 if (r < 0)
2786 return log_error_errno(r, "Failed to create /run/host: %m");
2787
2788 r = userns_mkdir(root, "/run/host/incoming", 0600, 0, 0);
2789 if (r < 0)
2790 return log_error_errno(r, "Failed to create /run/host/incoming: %m");
2791
2792 q = prefix_roota(root, "/run/host/incoming");
2793 r = mount_nofollow_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL);
2794 if (r < 0)
2795 return r;
2796
2797 r = mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
2798 if (r < 0)
2799 return r;
2800
2801 /* machined will MS_MOVE into that directory, and that's only supported for non-shared mounts. */
2802 return mount_nofollow_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL);
2803 }
2804
2805 static int setup_machine_id(const char *directory) {
2806 const char *etc_machine_id;
2807 sd_id128_t id;
2808 int r;
2809
2810 /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the
2811 * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The
2812 * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not
2813 * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id
2814 * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the
2815 * container behaves nicely). */
2816
2817 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
2818
2819 r = id128_read(etc_machine_id, ID128_PLAIN_OR_UNINIT, &id);
2820 if (r < 0) {
2821 if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */
2822 return log_error_errno(r, "Failed to read machine ID from container image: %m");
2823
2824 if (sd_id128_is_null(arg_uuid)) {
2825 r = sd_id128_randomize(&arg_uuid);
2826 if (r < 0)
2827 return log_error_errno(r, "Failed to acquire randomized machine UUID: %m");
2828 }
2829 } else {
2830 if (sd_id128_is_null(id))
2831 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
2832 "Machine ID in container image is zero, refusing.");
2833
2834 arg_uuid = id;
2835 }
2836
2837 return 0;
2838 }
2839
2840 static int recursive_chown(const char *directory, uid_t shift, uid_t range) {
2841 int r;
2842
2843 assert(directory);
2844
2845 if (arg_userns_mode == USER_NAMESPACE_NO || arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_CHOWN)
2846 return 0;
2847
2848 r = path_patch_uid(directory, arg_uid_shift, arg_uid_range);
2849 if (r == -EOPNOTSUPP)
2850 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.");
2851 if (r == -EBADE)
2852 return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match.");
2853 if (r < 0)
2854 return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m");
2855 if (r == 0)
2856 log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation.");
2857 else
2858 log_debug("Patched directory tree to match UID/GID range.");
2859
2860 return r;
2861 }
2862
2863 /*
2864 * Return values:
2865 * < 0 : wait_for_terminate() failed to get the state of the
2866 * container, the container was terminated by a signal, or
2867 * failed for an unknown reason. No change is made to the
2868 * container argument.
2869 * > 0 : The program executed in the container terminated with an
2870 * error. The exit code of the program executed in the
2871 * container is returned. The container argument has been set
2872 * to CONTAINER_TERMINATED.
2873 * 0 : The container is being rebooted, has been shut down or exited
2874 * successfully. The container argument has been set to either
2875 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
2876 *
2877 * That is, success is indicated by a return value of zero, and an
2878 * error is indicated by a non-zero value.
2879 */
2880 static int wait_for_container(pid_t pid, ContainerStatus *container) {
2881 siginfo_t status;
2882 int r;
2883
2884 r = wait_for_terminate(pid, &status);
2885 if (r < 0)
2886 return log_warning_errno(r, "Failed to wait for container: %m");
2887
2888 switch (status.si_code) {
2889
2890 case CLD_EXITED:
2891 if (status.si_status == 0)
2892 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
2893 else
2894 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
2895
2896 *container = CONTAINER_TERMINATED;
2897 return status.si_status;
2898
2899 case CLD_KILLED:
2900 if (status.si_status == SIGINT) {
2901 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
2902 *container = CONTAINER_TERMINATED;
2903 return 0;
2904
2905 } else if (status.si_status == SIGHUP) {
2906 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
2907 *container = CONTAINER_REBOOTED;
2908 return 0;
2909 }
2910
2911 _fallthrough_;
2912 case CLD_DUMPED:
2913 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2914 "Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
2915
2916 default:
2917 return log_error_errno(SYNTHETIC_ERRNO(EIO),
2918 "Container %s failed due to unknown reason.", arg_machine);
2919 }
2920 }
2921
2922 static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
2923 pid_t pid;
2924
2925 pid = PTR_TO_PID(userdata);
2926 if (pid > 0) {
2927 if (kill(pid, arg_kill_signal) >= 0) {
2928 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
2929 sd_event_source_set_userdata(s, NULL);
2930 return 0;
2931 }
2932 }
2933
2934 sd_event_exit(sd_event_source_get_event(s), 0);
2935 return 0;
2936 }
2937
2938 static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) {
2939 pid_t pid;
2940
2941 assert(s);
2942 assert(ssi);
2943
2944 pid = PTR_TO_PID(userdata);
2945
2946 for (;;) {
2947 siginfo_t si = {};
2948
2949 if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0)
2950 return log_error_errno(errno, "Failed to waitid(): %m");
2951 if (si.si_pid == 0) /* No pending children. */
2952 break;
2953 if (si.si_pid == pid) {
2954 /* The main process we care for has exited. Return from
2955 * signal handler but leave the zombie. */
2956 sd_event_exit(sd_event_source_get_event(s), 0);
2957 break;
2958 }
2959
2960 /* Reap all other children. */
2961 (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED);
2962 }
2963
2964 return 0;
2965 }
2966
2967 static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *error) {
2968 pid_t pid;
2969
2970 assert(m);
2971
2972 pid = PTR_TO_PID(userdata);
2973
2974 if (arg_kill_signal > 0) {
2975 log_info("Container termination requested. Attempting to halt container.");
2976 (void) kill(pid, arg_kill_signal);
2977 } else {
2978 log_info("Container termination requested. Exiting.");
2979 sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m)), 0);
2980 }
2981
2982 return 0;
2983 }
2984
2985 static int determine_names(void) {
2986 int r;
2987
2988 if (arg_template && !arg_directory && arg_machine) {
2989
2990 /* If --template= was specified then we should not
2991 * search for a machine, but instead create a new one
2992 * in /var/lib/machine. */
2993
2994 arg_directory = path_join("/var/lib/machines", arg_machine);
2995 if (!arg_directory)
2996 return log_oom();
2997 }
2998
2999 if (!arg_image && !arg_directory) {
3000 if (arg_machine) {
3001 _cleanup_(image_unrefp) Image *i = NULL;
3002
3003 r = image_find(IMAGE_MACHINE, arg_machine, NULL, &i);
3004 if (r == -ENOENT)
3005 return log_error_errno(r, "No image for machine '%s'.", arg_machine);
3006 if (r < 0)
3007 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
3008
3009 if (IN_SET(i->type, IMAGE_RAW, IMAGE_BLOCK))
3010 r = free_and_strdup(&arg_image, i->path);
3011 else
3012 r = free_and_strdup(&arg_directory, i->path);
3013 if (r < 0)
3014 return log_oom();
3015
3016 if (!arg_ephemeral)
3017 arg_read_only = arg_read_only || i->read_only;
3018 } else {
3019 r = safe_getcwd(&arg_directory);
3020 if (r < 0)
3021 return log_error_errno(r, "Failed to determine current directory: %m");
3022 }
3023
3024 if (!arg_directory && !arg_image)
3025 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine path, please use -D or -i.");
3026 }
3027
3028 if (!arg_machine) {
3029 if (arg_directory && path_equal(arg_directory, "/"))
3030 arg_machine = gethostname_malloc();
3031 else if (arg_image) {
3032 char *e;
3033
3034 arg_machine = strdup(basename(arg_image));
3035
3036 /* Truncate suffix if there is one */
3037 e = endswith(arg_machine, ".raw");
3038 if (e)
3039 *e = 0;
3040 } else
3041 arg_machine = strdup(basename(arg_directory));
3042 if (!arg_machine)
3043 return log_oom();
3044
3045 hostname_cleanup(arg_machine);
3046 if (!hostname_is_valid(arg_machine, 0))
3047 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine machine name automatically, please use -M.");
3048
3049 /* Add a random suffix when this is an ephemeral machine, so that we can run many
3050 * instances at once without manually having to specify -M each time. */
3051 if (arg_ephemeral)
3052 if (strextendf(&arg_machine, "-%016" PRIx64, random_u64()) < 0)
3053 return log_oom();
3054 }
3055
3056 return 0;
3057 }
3058
3059 static int chase_symlinks_and_update(char **p, unsigned flags) {
3060 char *chased;
3061 int r;
3062
3063 assert(p);
3064
3065 if (!*p)
3066 return 0;
3067
3068 r = chase_symlinks(*p, NULL, flags, &chased, NULL);
3069 if (r < 0)
3070 return log_error_errno(r, "Failed to resolve path %s: %m", *p);
3071
3072 return free_and_replace(*p, chased);
3073 }
3074
3075 static int determine_uid_shift(const char *directory) {
3076
3077 if (arg_userns_mode == USER_NAMESPACE_NO) {
3078 arg_uid_shift = 0;
3079 return 0;
3080 }
3081
3082 if (arg_uid_shift == UID_INVALID) {
3083 struct stat st;
3084
3085 /* Read the UID shift off the image. Maybe we can reuse this to avoid chowning. */
3086
3087 if (stat(directory, &st) < 0)
3088 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
3089
3090 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
3091
3092 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000)))
3093 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3094 "UID and GID base of %s don't match.", directory);
3095
3096 arg_uid_range = UINT32_C(0x10000);
3097
3098 if (arg_uid_shift != 0) {
3099 /* If the image is shifted already, then we'll fall back to classic chowning, for
3100 * compatibility (and simplicity), or refuse if mapping is explicitly requested. */
3101
3102 if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_AUTO) {
3103 log_debug("UID base of %s is non-zero, not using UID mapping.", directory);
3104 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3105 } else if (arg_userns_ownership == USER_NAMESPACE_OWNERSHIP_MAP)
3106 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
3107 "UID base of %s is not zero, UID mapping not supported.", directory);
3108 }
3109 }
3110
3111 if (!userns_shift_range_valid(arg_uid_shift, arg_uid_range))
3112 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "UID base too high for UID range.");
3113
3114 return 0;
3115 }
3116
3117 static unsigned long effective_clone_ns_flags(void) {
3118 unsigned long flags = arg_clone_ns_flags;
3119
3120 if (arg_private_network)
3121 flags |= CLONE_NEWNET;
3122 if (arg_use_cgns)
3123 flags |= CLONE_NEWCGROUP;
3124 if (arg_userns_mode != USER_NAMESPACE_NO)
3125 flags |= CLONE_NEWUSER;
3126
3127 return flags;
3128 }
3129
3130 static int patch_sysctl(void) {
3131
3132 /* This table is inspired by runc's sysctl() function */
3133 static const struct {
3134 const char *key;
3135 bool prefix;
3136 unsigned long clone_flags;
3137 } safe_sysctl[] = {
3138 { "kernel.hostname", false, CLONE_NEWUTS },
3139 { "kernel.domainname", false, CLONE_NEWUTS },
3140 { "kernel.msgmax", false, CLONE_NEWIPC },
3141 { "kernel.msgmnb", false, CLONE_NEWIPC },
3142 { "kernel.msgmni", false, CLONE_NEWIPC },
3143 { "kernel.sem", false, CLONE_NEWIPC },
3144 { "kernel.shmall", false, CLONE_NEWIPC },
3145 { "kernel.shmmax", false, CLONE_NEWIPC },
3146 { "kernel.shmmni", false, CLONE_NEWIPC },
3147 { "fs.mqueue.", true, CLONE_NEWIPC },
3148 { "net.", true, CLONE_NEWNET },
3149 };
3150
3151 unsigned long flags;
3152 int r;
3153
3154 flags = effective_clone_ns_flags();
3155
3156 STRV_FOREACH_PAIR(k, v, arg_sysctl) {
3157 bool good = false;
3158 size_t i;
3159
3160 for (i = 0; i < ELEMENTSOF(safe_sysctl); i++) {
3161
3162 if (!FLAGS_SET(flags, safe_sysctl[i].clone_flags))
3163 continue;
3164
3165 if (safe_sysctl[i].prefix)
3166 good = startswith(*k, safe_sysctl[i].key);
3167 else
3168 good = streq(*k, safe_sysctl[i].key);
3169
3170 if (good)
3171 break;
3172 }
3173
3174 if (!good)
3175 return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k);
3176
3177 r = sysctl_write(*k, *v);
3178 if (r < 0)
3179 return log_error_errno(r, "Failed to write sysctl '%s': %m", *k);
3180 }
3181
3182 return 0;
3183 }
3184
3185 static int inner_child(
3186 Barrier *barrier,
3187 const char *directory,
3188 bool secondary,
3189 int kmsg_socket,
3190 int rtnl_socket,
3191 int master_pty_socket,
3192 FDSet *fds,
3193 char **os_release_pairs) {
3194
3195 _cleanup_free_ char *home = NULL;
3196 size_t n_env = 1;
3197 char *envp[] = {
3198 (char*) "PATH=" DEFAULT_PATH_COMPAT,
3199 NULL, /* container */
3200 NULL, /* TERM */
3201 NULL, /* HOME */
3202 NULL, /* USER */
3203 NULL, /* LOGNAME */
3204 NULL, /* container_uuid */
3205 NULL, /* LISTEN_FDS */
3206 NULL, /* LISTEN_PID */
3207 NULL, /* NOTIFY_SOCKET */
3208 NULL, /* CREDENTIALS_DIRECTORY */
3209 NULL
3210 };
3211 const char *exec_target;
3212 _cleanup_strv_free_ char **env_use = NULL;
3213 int r, which_failed;
3214
3215 /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one
3216 * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID,
3217 * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace,
3218 * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS
3219 * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by
3220 * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER
3221 * namespace.
3222 *
3223 * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through
3224 * unshare(). See below. */
3225
3226 assert(barrier);
3227 assert(directory);
3228 assert(kmsg_socket >= 0);
3229
3230 log_debug("Inner child is initializing.");
3231
3232 if (arg_userns_mode != USER_NAMESPACE_NO) {
3233 /* Tell the parent, that it now can write the UID map. */
3234 (void) barrier_place(barrier); /* #1 */
3235
3236 /* Wait until the parent wrote the UID map */
3237 if (!barrier_place_and_sync(barrier)) /* #2 */
3238 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
3239
3240 /* Become the new root user inside our namespace */
3241 r = reset_uid_gid();
3242 if (r < 0)
3243 return log_error_errno(r, "Couldn't become new root: %m");
3244
3245 /* Creating a new user namespace means all MS_SHARED mounts become MS_SLAVE. Let's put them
3246 * back to MS_SHARED here, since that's what we want as defaults. (This will not reconnect
3247 * propagation, but simply create new peer groups for all our mounts). */
3248 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SHARED|MS_REC, NULL);
3249 if (r < 0)
3250 return r;
3251 }
3252
3253 r = mount_all(NULL,
3254 arg_mount_settings | MOUNT_IN_USERNS,
3255 arg_uid_shift,
3256 arg_selinux_apifs_context);
3257 if (r < 0)
3258 return r;
3259
3260 if (!arg_network_namespace_path && arg_private_network) {
3261 r = unshare(CLONE_NEWNET);
3262 if (r < 0)
3263 return log_error_errno(errno, "Failed to unshare network namespace: %m");
3264
3265 /* Tell the parent that it can setup network interfaces. */
3266 (void) barrier_place(barrier); /* #3 */
3267 }
3268
3269 r = mount_sysfs(NULL, arg_mount_settings);
3270 if (r < 0)
3271 return r;
3272
3273 /* Wait until we are cgroup-ified, so that we
3274 * can mount the right cgroup path writable */
3275 if (!barrier_place_and_sync(barrier)) /* #4 */
3276 return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
3277 "Parent died too early");
3278
3279 if (arg_use_cgns) {
3280 r = unshare(CLONE_NEWCGROUP);
3281 if (r < 0)
3282 return log_error_errno(errno, "Failed to unshare cgroup namespace: %m");
3283 r = mount_cgroups(
3284 "",
3285 arg_unified_cgroup_hierarchy,
3286 arg_userns_mode != USER_NAMESPACE_NO,
3287 arg_uid_shift,
3288 arg_uid_range,
3289 arg_selinux_apifs_context,
3290 true);
3291 } else
3292 r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy);
3293 if (r < 0)
3294 return r;
3295
3296 r = setup_boot_id();
3297 if (r < 0)
3298 return r;
3299
3300 r = setup_kmsg(kmsg_socket);
3301 if (r < 0)
3302 return r;
3303 kmsg_socket = safe_close(kmsg_socket);
3304
3305 r = mount_custom(
3306 "/",
3307 arg_custom_mounts,
3308 arg_n_custom_mounts,
3309 0,
3310 0,
3311 arg_selinux_apifs_context,
3312 MOUNT_NON_ROOT_ONLY | MOUNT_IN_USERNS);
3313 if (r < 0)
3314 return r;
3315
3316 if (setsid() < 0)
3317 return log_error_errno(errno, "setsid() failed: %m");
3318
3319 if (arg_private_network)
3320 (void) loopback_setup();
3321
3322 if (arg_expose_ports) {
3323 r = expose_port_send_rtnl(rtnl_socket);
3324 if (r < 0)
3325 return r;
3326 rtnl_socket = safe_close(rtnl_socket);
3327 }
3328
3329 if (arg_console_mode != CONSOLE_PIPE) {
3330 _cleanup_close_ int master = -1;
3331 _cleanup_free_ char *console = NULL;
3332
3333 /* Allocate a pty and make it available as /dev/console. */
3334 master = openpt_allocate(O_RDWR|O_NONBLOCK, &console);
3335 if (master < 0)
3336 return log_error_errno(master, "Failed to allocate a pty: %m");
3337
3338 r = setup_dev_console(console);
3339 if (r < 0)
3340 return log_error_errno(r, "Failed to set up /dev/console: %m");
3341
3342 r = send_one_fd(master_pty_socket, master, 0);
3343 if (r < 0)
3344 return log_error_errno(r, "Failed to send master fd: %m");
3345 master_pty_socket = safe_close(master_pty_socket);
3346
3347 r = setup_stdio_as_dev_console();
3348 if (r < 0)
3349 return r;
3350 }
3351
3352 r = patch_sysctl();
3353 if (r < 0)
3354 return r;
3355
3356 if (arg_oom_score_adjust_set) {
3357 r = set_oom_score_adjust(arg_oom_score_adjust);
3358 if (r < 0)
3359 return log_error_errno(r, "Failed to adjust OOM score: %m");
3360 }
3361
3362 if (arg_cpu_set.set)
3363 if (sched_setaffinity(0, arg_cpu_set.allocated, arg_cpu_set.set) < 0)
3364 return log_error_errno(errno, "Failed to set CPU affinity: %m");
3365
3366 (void) setup_hostname();
3367
3368 if (arg_personality != PERSONALITY_INVALID) {
3369 r = safe_personality(arg_personality);
3370 if (r < 0)
3371 return log_error_errno(r, "personality() failed: %m");
3372 } else if (secondary) {
3373 r = safe_personality(PER_LINUX32);
3374 if (r < 0)
3375 return log_error_errno(r, "personality() failed: %m");
3376 }
3377
3378 r = setrlimit_closest_all((const struct rlimit *const*) arg_rlimit, &which_failed);
3379 if (r < 0)
3380 return log_error_errno(r, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed));
3381
3382 #if HAVE_SECCOMP
3383 if (arg_seccomp) {
3384
3385 if (is_seccomp_available()) {
3386
3387 r = seccomp_load(arg_seccomp);
3388 if (ERRNO_IS_SECCOMP_FATAL(r))
3389 return log_error_errno(r, "Failed to install seccomp filter: %m");
3390 if (r < 0)
3391 log_debug_errno(r, "Failed to install seccomp filter: %m");
3392 }
3393 } else
3394 #endif
3395 {
3396 r = setup_seccomp(arg_caps_retain, arg_syscall_allow_list, arg_syscall_deny_list);
3397 if (r < 0)
3398 return r;
3399 }
3400
3401 if (arg_suppress_sync) {
3402 #if HAVE_SECCOMP
3403 r = seccomp_suppress_sync();
3404 if (r < 0)
3405 log_debug_errno(r, "Failed to install sync() suppression seccomp filter, ignoring: %m");
3406 #else
3407 log_debug("systemd is built without SECCOMP support. Ignoring --suppress-sync= command line option and SuppressSync= setting.");
3408 #endif
3409 }
3410
3411 #if HAVE_SELINUX
3412 if (arg_selinux_context)
3413 if (setexeccon(arg_selinux_context) < 0)
3414 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
3415 #endif
3416
3417 /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps
3418 * if we need to later on. */
3419 if (prctl(PR_SET_KEEPCAPS, 1) < 0)
3420 return log_error_errno(errno, "Failed to set PR_SET_KEEPCAPS: %m");
3421
3422 if (uid_is_valid(arg_uid) || gid_is_valid(arg_gid))
3423 r = change_uid_gid_raw(arg_uid, arg_gid, arg_supplementary_gids, arg_n_supplementary_gids, arg_console_mode != CONSOLE_PIPE);
3424 else
3425 r = change_uid_gid(arg_user, arg_console_mode != CONSOLE_PIPE, &home);
3426 if (r < 0)
3427 return r;
3428
3429 r = drop_capabilities(getuid());
3430 if (r < 0)
3431 return log_error_errno(r, "Dropping capabilities failed: %m");
3432
3433 if (arg_no_new_privileges)
3434 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0)
3435 return log_error_errno(errno, "Failed to disable new privileges: %m");
3436
3437 /* LXC sets container=lxc, so follow the scheme here */
3438 envp[n_env++] = strjoina("container=", arg_container_service_name);
3439
3440 envp[n_env] = strv_find_prefix(environ, "TERM=");
3441 if (envp[n_env])
3442 n_env++;
3443
3444 if (home || !uid_is_valid(arg_uid) || arg_uid == 0)
3445 if (asprintf(envp + n_env++, "HOME=%s", home ?: "/root") < 0)
3446 return log_oom();
3447
3448 if (arg_user || !uid_is_valid(arg_uid) || arg_uid == 0)
3449 if (asprintf(envp + n_env++, "USER=%s", arg_user ?: "root") < 0 ||
3450 asprintf(envp + n_env++, "LOGNAME=%s", arg_user ? arg_user : "root") < 0)
3451 return log_oom();
3452
3453 assert(!sd_id128_is_null(arg_uuid));
3454
3455 if (asprintf(envp + n_env++, "container_uuid=%s", SD_ID128_TO_UUID_STRING(arg_uuid)) < 0)
3456 return log_oom();
3457
3458 if (fdset_size(fds) > 0) {
3459 r = fdset_cloexec(fds, false);
3460 if (r < 0)
3461 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
3462
3463 if ((asprintf(envp + n_env++, "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
3464 (asprintf(envp + n_env++, "LISTEN_PID=1") < 0))
3465 return log_oom();
3466 }
3467 if (asprintf(envp + n_env++, "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0)
3468 return log_oom();
3469
3470 if (arg_n_credentials > 0) {
3471 envp[n_env] = strdup("CREDENTIALS_DIRECTORY=/run/host/credentials");
3472 if (!envp[n_env])
3473 return log_oom();
3474 n_env++;
3475 }
3476
3477 env_use = strv_env_merge(envp, os_release_pairs, arg_setenv);
3478 if (!env_use)
3479 return log_oom();
3480
3481 /* Let the parent know that we are ready and
3482 * wait until the parent is ready with the
3483 * setup, too... */
3484 if (!barrier_place_and_sync(barrier)) /* #5 */
3485 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Parent died too early");
3486
3487 if (arg_chdir)
3488 if (chdir(arg_chdir) < 0)
3489 return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
3490
3491 if (arg_start_mode == START_PID2) {
3492 r = stub_pid1(arg_uuid);
3493 if (r < 0)
3494 return r;
3495 }
3496
3497 if (arg_console_mode != CONSOLE_PIPE) {
3498 /* So far our pty wasn't controlled by any process. Finally, it's time to change that, if we
3499 * are configured for that. Acquire it as controlling tty. */
3500 if (ioctl(STDIN_FILENO, TIOCSCTTY) < 0)
3501 return log_error_errno(errno, "Failed to acquire controlling TTY: %m");
3502 }
3503
3504 log_debug("Inner child completed, invoking payload.");
3505
3506 /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first
3507 * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need
3508 * it again. Note that the other fds closed here are at least the locking and barrier fds. */
3509 log_close();
3510 log_set_open_when_needed(true);
3511
3512 (void) fdset_close_others(fds);
3513
3514 if (arg_start_mode == START_BOOT) {
3515 char **a;
3516 size_t m;
3517
3518 /* Automatically search for the init system */
3519
3520 m = strv_length(arg_parameters);
3521 a = newa(char*, m + 2);
3522 memcpy_safe(a + 1, arg_parameters, m * sizeof(char*));
3523 a[1 + m] = NULL;
3524
3525 FOREACH_STRING(init,
3526 "/usr/lib/systemd/systemd",
3527 "/lib/systemd/systemd",
3528 "/sbin/init") {
3529 a[0] = (char*) init;
3530 execve(a[0], a, env_use);
3531 }
3532
3533 exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init";
3534 } else if (!strv_isempty(arg_parameters)) {
3535 const char *dollar_path;
3536
3537 exec_target = arg_parameters[0];
3538
3539 /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the
3540 * binary. */
3541 dollar_path = strv_env_get(env_use, "PATH");
3542 if (dollar_path) {
3543 if (setenv("PATH", dollar_path, 1) < 0)
3544 return log_error_errno(errno, "Failed to update $PATH: %m");
3545 }
3546
3547 execvpe(arg_parameters[0], arg_parameters, env_use);
3548 } else {
3549 if (!arg_chdir)
3550 /* If we cannot change the directory, we'll end up in /, that is expected. */
3551 (void) chdir(home ?: "/root");
3552
3553 execle(DEFAULT_USER_SHELL, "-" DEFAULT_USER_SHELL_NAME, NULL, env_use);
3554 if (!streq(DEFAULT_USER_SHELL, "/bin/bash"))
3555 execle("/bin/bash", "-bash", NULL, env_use);
3556 if (!streq(DEFAULT_USER_SHELL, "/bin/sh"))
3557 execle("/bin/sh", "-sh", NULL, env_use);
3558
3559 exec_target = DEFAULT_USER_SHELL ", /bin/bash, /bin/sh";
3560 }
3561
3562 return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
3563 }
3564
3565 static int setup_notify_child(void) {
3566 _cleanup_close_ int fd = -1;
3567 static const union sockaddr_union sa = {
3568 .un.sun_family = AF_UNIX,
3569 .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH,
3570 };
3571 int r;
3572
3573 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3574 if (fd < 0)
3575 return log_error_errno(errno, "Failed to allocate notification socket: %m");
3576
3577 (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755);
3578 (void) sockaddr_un_unlink(&sa.un);
3579
3580 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
3581 if (r < 0)
3582 return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m");
3583
3584 r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0);
3585 if (r < 0)
3586 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
3587
3588 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
3589 if (r < 0)
3590 return log_error_errno(r, "SO_PASSCRED failed: %m");
3591
3592 return TAKE_FD(fd);
3593 }
3594
3595 static int outer_child(
3596 Barrier *barrier,
3597 const char *directory,
3598 DissectedImage *dissected_image,
3599 bool secondary,
3600 int pid_socket,
3601 int uuid_socket,
3602 int notify_socket,
3603 int kmsg_socket,
3604 int rtnl_socket,
3605 int uid_shift_socket,
3606 int master_pty_socket,
3607 int unified_cgroup_hierarchy_socket,
3608 FDSet *fds,
3609 int netns_fd) {
3610
3611 _cleanup_(bind_user_context_freep) BindUserContext *bind_user_context = NULL;
3612 _cleanup_strv_free_ char **os_release_pairs = NULL;
3613 _cleanup_close_ int fd = -1;
3614 bool idmap = false;
3615 const char *p;
3616 pid_t pid;
3617 ssize_t l;
3618 int r;
3619
3620 /* This is the "outer" child process, i.e the one forked off by the container manager itself. It
3621 * already has its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in
3622 * the host's CLONE_NEWPID, CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET
3623 * namespaces. After it completed a number of initializations a second child (the "inner" one) is
3624 * forked off it, and it exits. */
3625
3626 assert(barrier);
3627 assert(directory);
3628 assert(pid_socket >= 0);
3629 assert(uuid_socket >= 0);
3630 assert(notify_socket >= 0);
3631 assert(master_pty_socket >= 0);
3632 assert(kmsg_socket >= 0);
3633
3634 log_debug("Outer child is initializing.");
3635
3636 r = load_os_release_pairs_with_prefix("/", "container_host_", &os_release_pairs);
3637 if (r < 0)
3638 log_debug_errno(r, "Failed to read os-release from host for container, ignoring: %m");
3639
3640 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
3641 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
3642
3643 r = reset_audit_loginuid();
3644 if (r < 0)
3645 return r;
3646
3647 /* Mark everything as slave, so that we still receive mounts from the real root, but don't propagate
3648 * mounts to the real root. */
3649 r = mount_follow_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
3650 if (r < 0)
3651 return r;
3652
3653 if (dissected_image) {
3654 /* If we are operating on a disk image, then mount its root directory now, but leave out the
3655 * rest. We can read the UID shift from it if we need to. Further down we'll mount the rest,
3656 * but then with the uid shift known. That way we can mount VFAT file systems shifted to the
3657 * right place right away. This makes sure ESP partitions and userns are compatible. */
3658
3659 r = dissected_image_mount_and_warn(
3660 dissected_image,
3661 directory,
3662 arg_uid_shift,
3663 arg_uid_range,
3664 DISSECT_IMAGE_MOUNT_ROOT_ONLY|
3665 DISSECT_IMAGE_DISCARD_ON_LOOP|
3666 DISSECT_IMAGE_USR_NO_ROOT|
3667 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
3668 (arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0));
3669 if (r < 0)
3670 return r;
3671 }
3672
3673 r = determine_uid_shift(directory);
3674 if (r < 0)
3675 return r;
3676
3677 if (arg_userns_mode != USER_NAMESPACE_NO) {
3678 /* Let the parent know which UID shift we read from the image */
3679 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
3680 if (l < 0)
3681 return log_error_errno(errno, "Failed to send UID shift: %m");
3682 if (l != sizeof(arg_uid_shift))
3683 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3684 "Short write while sending UID shift.");
3685
3686 if (arg_userns_mode == USER_NAMESPACE_PICK) {
3687 /* When we are supposed to pick the UID shift, the parent will check now whether the
3688 * UID shift we just read from the image is available. If yes, it will send the UID
3689 * shift back to us, if not it will pick a different one, and send it back to us. */
3690
3691 l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0);
3692 if (l < 0)
3693 return log_error_errno(errno, "Failed to recv UID shift: %m");
3694 if (l != sizeof(arg_uid_shift))
3695 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3696 "Short read while receiving UID shift.");
3697 }
3698
3699 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
3700 "Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
3701 }
3702
3703 if (path_equal(directory, "/")) {
3704 /* If the directory we shall boot is the host, let's operate on a bind mount at a different
3705 * place, so that we can make changes to its mount structure (for example, to implement
3706 * --volatile=) without this interfering with our ability to access files such as
3707 * /etc/localtime to copy into the container. Note that we use a fixed place for this
3708 * (instead of a temporary directory, since we are living in our own mount namspace here
3709 * already, and thus don't need to be afraid of colliding with anyone else's mounts). */
3710 (void) mkdir_p("/run/systemd/nspawn-root", 0755);
3711
3712 r = mount_nofollow_verbose(LOG_ERR, "/", "/run/systemd/nspawn-root", NULL, MS_BIND|MS_REC, NULL);
3713 if (r < 0)
3714 return r;
3715
3716 directory = "/run/systemd/nspawn-root";
3717 }
3718
3719 r = setup_pivot_root(
3720 directory,
3721 arg_pivot_root_new,
3722 arg_pivot_root_old);
3723 if (r < 0)
3724 return r;
3725
3726 r = setup_volatile_mode(
3727 directory,
3728 arg_volatile_mode,
3729 arg_uid_shift,
3730 arg_selinux_apifs_context);
3731 if (r < 0)
3732 return r;
3733
3734 r = bind_user_prepare(
3735 directory,
3736 arg_bind_user,
3737 arg_uid_shift,
3738 arg_uid_range,
3739 &arg_custom_mounts, &arg_n_custom_mounts,
3740 &bind_user_context);
3741 if (r < 0)
3742 return r;
3743
3744 if (arg_userns_mode != USER_NAMESPACE_NO && bind_user_context) {
3745 /* Send the user maps we determined to the parent, so that it installs it in our user
3746 * namespace UID map table */
3747
3748 for (size_t i = 0; i < bind_user_context->n_data; i++) {
3749 uid_t map[] = {
3750 bind_user_context->data[i].payload_user->uid,
3751 bind_user_context->data[i].host_user->uid,
3752 (uid_t) bind_user_context->data[i].payload_group->gid,
3753 (uid_t) bind_user_context->data[i].host_group->gid,
3754 };
3755
3756 l = send(uid_shift_socket, map, sizeof(map), MSG_NOSIGNAL);
3757 if (l < 0)
3758 return log_error_errno(errno, "Failed to send user UID map: %m");
3759 if (l != sizeof(map))
3760 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3761 "Short write while sending user UID map.");
3762 }
3763 }
3764
3765 r = mount_custom(
3766 directory,
3767 arg_custom_mounts,
3768 arg_n_custom_mounts,
3769 arg_uid_shift,
3770 arg_uid_range,
3771 arg_selinux_apifs_context,
3772 MOUNT_ROOT_ONLY);
3773 if (r < 0)
3774 return r;
3775
3776 /* Make sure we always have a mount that we can move to root later on. */
3777 r = make_mount_point(directory);
3778 if (r < 0)
3779 return r;
3780
3781 if (arg_userns_mode != USER_NAMESPACE_NO &&
3782 IN_SET(arg_userns_ownership, USER_NAMESPACE_OWNERSHIP_MAP, USER_NAMESPACE_OWNERSHIP_AUTO) &&
3783 arg_uid_shift != 0) {
3784
3785 r = remount_idmap(directory, arg_uid_shift, arg_uid_range, REMOUNT_IDMAP_HOST_ROOT);
3786 if (r == -EINVAL || ERRNO_IS_NOT_SUPPORTED(r)) {
3787 /* This might fail because the kernel or file system doesn't support idmapping. We
3788 * can't really distinguish this nicely, nor do we have any guarantees about the
3789 * error codes we see, could be EOPNOTSUPP or EINVAL. */
3790 if (arg_userns_ownership != USER_NAMESPACE_OWNERSHIP_AUTO)
3791 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
3792 "ID mapped mounts are apparently not available, sorry.");
3793
3794 log_debug("ID mapped mounts are apparently not available on this kernel or for the selected file system, reverting to recursive chown()ing.");
3795 arg_userns_ownership = USER_NAMESPACE_OWNERSHIP_CHOWN;
3796 } else if (r < 0)
3797 return log_error_errno(r, "Failed to set up ID mapped mounts: %m");
3798 else {
3799 log_debug("ID mapped mounts available, making use of them.");
3800 idmap = true;
3801 }
3802 }
3803
3804 if (dissected_image) {
3805 /* Now we know the uid shift, let's now mount everything else that might be in the image. */
3806 r = dissected_image_mount(
3807 dissected_image,
3808 directory,
3809 arg_uid_shift,
3810 arg_uid_range,
3811 DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|
3812 DISSECT_IMAGE_DISCARD_ON_LOOP|
3813 DISSECT_IMAGE_USR_NO_ROOT|
3814 (arg_read_only ? DISSECT_IMAGE_READ_ONLY : DISSECT_IMAGE_FSCK|DISSECT_IMAGE_GROWFS)|
3815 (idmap ? DISSECT_IMAGE_MOUNT_IDMAPPED : 0));
3816 if (r == -EUCLEAN)
3817 return log_error_errno(r, "File system check for image failed: %m");
3818 if (r < 0)
3819 return log_error_errno(r, "Failed to mount image file system: %m");
3820 }
3821
3822 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
3823 /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */
3824
3825 r = detect_unified_cgroup_hierarchy_from_image(directory);
3826 if (r < 0)
3827 return r;
3828
3829 l = send(unified_cgroup_hierarchy_socket, &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), MSG_NOSIGNAL);
3830 if (l < 0)
3831 return log_error_errno(errno, "Failed to send cgroup mode: %m");
3832 if (l != sizeof(arg_unified_cgroup_hierarchy))
3833 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3834 "Short write while sending cgroup mode.");
3835
3836 unified_cgroup_hierarchy_socket = safe_close(unified_cgroup_hierarchy_socket);
3837 }
3838
3839 /* Mark everything as shared so our mounts get propagated down. This is required to make new bind
3840 * mounts available in systemd services inside the container that create a new mount namespace. See
3841 * https://github.com/systemd/systemd/issues/3860 Further submounts (such as /dev) done after this
3842 * will inherit the shared propagation mode.
3843 *
3844 * IMPORTANT: Do not overmount the root directory anymore from now on to enable moving the root
3845 * directory mount to root later on.
3846 * https://github.com/systemd/systemd/issues/3847#issuecomment-562735251
3847 */
3848 r = mount_nofollow_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL);
3849 if (r < 0)
3850 return r;
3851
3852 r = recursive_chown(directory, arg_uid_shift, arg_uid_range);
3853 if (r < 0)
3854 return r;
3855
3856 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
3857 if (r < 0)
3858 return r;
3859
3860 if (arg_read_only && arg_volatile_mode == VOLATILE_NO &&
3861 !has_custom_root_mount(arg_custom_mounts, arg_n_custom_mounts)) {
3862 r = bind_remount_recursive(directory, MS_RDONLY, MS_RDONLY, NULL);
3863 if (r < 0)
3864 return log_error_errno(r, "Failed to make tree read-only: %m");
3865 }
3866
3867 r = mount_all(directory,
3868 arg_mount_settings,
3869 arg_uid_shift,
3870 arg_selinux_apifs_context);
3871 if (r < 0)
3872 return r;
3873
3874 r = copy_devnodes(directory);
3875 if (r < 0)
3876 return r;
3877
3878 r = make_extra_nodes(directory);
3879 if (r < 0)
3880 return r;
3881
3882 (void) dev_setup(directory, arg_uid_shift, arg_uid_shift);
3883
3884 p = prefix_roota(directory, "/run/host");
3885 (void) make_inaccessible_nodes(p, arg_uid_shift, arg_uid_shift);
3886
3887 r = setup_pts(directory);
3888 if (r < 0)
3889 return r;
3890
3891 r = setup_propagate(directory);
3892 if (r < 0)
3893 return r;
3894
3895 r = setup_keyring();
3896 if (r < 0)
3897 return r;
3898
3899 r = setup_credentials(directory);
3900 if (r < 0)
3901 return r;
3902
3903 r = bind_user_setup(bind_user_context, directory);
3904 if (r < 0)
3905 return r;
3906
3907 r = mount_custom(
3908 directory,
3909 arg_custom_mounts,
3910 arg_n_custom_mounts,
3911 arg_uid_shift,
3912 arg_uid_range,
3913 arg_selinux_apifs_context,
3914 MOUNT_NON_ROOT_ONLY);
3915 if (r < 0)
3916 return r;
3917
3918 r = setup_timezone(directory);
3919 if (r < 0)
3920 return r;
3921
3922 r = setup_resolv_conf(directory);
3923 if (r < 0)
3924 return r;
3925
3926 r = setup_machine_id(directory);
3927 if (r < 0)
3928 return r;
3929
3930 r = setup_journal(directory);
3931 if (r < 0)
3932 return r;
3933
3934 /* The same stuff as the $container env var, but nicely readable for the entire payload */
3935 p = prefix_roota(directory, "/run/host/container-manager");
3936 (void) write_string_file(p, arg_container_service_name, WRITE_STRING_FILE_CREATE);
3937
3938 /* The same stuff as the $container_uuid env var */
3939 p = prefix_roota(directory, "/run/host/container-uuid");
3940 (void) write_string_filef(p, WRITE_STRING_FILE_CREATE, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(arg_uuid));
3941
3942 if (!arg_use_cgns) {
3943 r = mount_cgroups(
3944 directory,
3945 arg_unified_cgroup_hierarchy,
3946 arg_userns_mode != USER_NAMESPACE_NO,
3947 arg_uid_shift,
3948 arg_uid_range,
3949 arg_selinux_apifs_context,
3950 false);
3951 if (r < 0)
3952 return r;
3953 }
3954
3955 r = mount_move_root(directory);
3956 if (r < 0)
3957 return log_error_errno(r, "Failed to move root directory: %m");
3958
3959 fd = setup_notify_child();
3960 if (fd < 0)
3961 return fd;
3962
3963 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
3964 arg_clone_ns_flags |
3965 (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
3966 if (pid < 0)
3967 return log_error_errno(errno, "Failed to fork inner child: %m");
3968 if (pid == 0) {
3969 pid_socket = safe_close(pid_socket);
3970 uuid_socket = safe_close(uuid_socket);
3971 notify_socket = safe_close(notify_socket);
3972 uid_shift_socket = safe_close(uid_shift_socket);
3973
3974 /* The inner child has all namespaces that are requested, so that we all are owned by the
3975 * user if user namespaces are turned on. */
3976
3977 if (arg_network_namespace_path) {
3978 r = namespace_enter(-1, -1, netns_fd, -1, -1);
3979 if (r < 0)
3980 return log_error_errno(r, "Failed to join network namespace: %m");
3981 }
3982
3983 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, master_pty_socket, fds, os_release_pairs);
3984 if (r < 0)
3985 _exit(EXIT_FAILURE);
3986
3987 _exit(EXIT_SUCCESS);
3988 }
3989
3990 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
3991 if (l < 0)
3992 return log_error_errno(errno, "Failed to send PID: %m");
3993 if (l != sizeof(pid))
3994 return log_error_errno(SYNTHETIC_ERRNO(EIO),
3995 "Short write while sending PID.");
3996
3997 l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL);
3998 if (l < 0)
3999 return log_error_errno(errno, "Failed to send machine ID: %m");
4000 if (l != sizeof(arg_uuid))
4001 return log_error_errno(SYNTHETIC_ERRNO(EIO),
4002 "Short write while sending machine ID.");
4003
4004 l = send_one_fd(notify_socket, fd, 0);
4005 if (l < 0)
4006 return log_error_errno(l, "Failed to send notify fd: %m");
4007
4008 pid_socket = safe_close(pid_socket);
4009 uuid_socket = safe_close(uuid_socket);
4010 notify_socket = safe_close(notify_socket);
4011 master_pty_socket = safe_close(master_pty_socket);
4012 kmsg_socket = safe_close(kmsg_socket);
4013 rtnl_socket = safe_close(rtnl_socket);
4014 netns_fd = safe_close(netns_fd);
4015
4016 return 0;
4017 }
4018
4019 static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) {
4020 bool tried_hashed = false;
4021 unsigned n_tries = 100;
4022 uid_t candidate;
4023 int r;
4024
4025 assert(shift);
4026 assert(ret_lock_file);
4027 assert(arg_userns_mode == USER_NAMESPACE_PICK);
4028 assert(arg_uid_range == 0x10000U);
4029
4030 candidate = *shift;
4031
4032 (void) mkdir("/run/systemd/nspawn-uid", 0755);
4033
4034 for (;;) {
4035 char lock_path[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1];
4036 _cleanup_(release_lock_file) LockFile lf = LOCK_FILE_INIT;
4037
4038 if (--n_tries <= 0)
4039 return -EBUSY;
4040
4041 if (candidate < CONTAINER_UID_BASE_MIN || candidate > CONTAINER_UID_BASE_MAX)
4042 goto next;
4043 if ((candidate & UINT32_C(0xFFFF)) != 0)
4044 goto next;
4045
4046 xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate);
4047 r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf);
4048 if (r == -EBUSY) /* Range already taken by another nspawn instance */
4049 goto next;
4050 if (r < 0)
4051 return r;
4052
4053 /* Make some superficial checks whether the range is currently known in the user database */
4054 if (getpwuid(candidate))
4055 goto next;
4056 if (getpwuid(candidate + UINT32_C(0xFFFE)))
4057 goto next;
4058 if (getgrgid(candidate))
4059 goto next;
4060 if (getgrgid(candidate + UINT32_C(0xFFFE)))
4061 goto next;
4062
4063 *ret_lock_file = lf;
4064 lf = (struct LockFile) LOCK_FILE_INIT;
4065 *shift = candidate;
4066 return 0;
4067
4068 next:
4069 if (arg_machine && !tried_hashed) {
4070 /* Try to hash the base from the container name */
4071
4072 static const uint8_t hash_key[] = {
4073 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf,
4074 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72
4075 };
4076
4077 candidate = (uid_t) siphash24(arg_machine, strlen(arg_machine), hash_key);
4078
4079 tried_hashed = true;
4080 } else
4081 random_bytes(&candidate, sizeof(candidate));
4082
4083 candidate = (candidate % (CONTAINER_UID_BASE_MAX - CONTAINER_UID_BASE_MIN)) + CONTAINER_UID_BASE_MIN;
4084 candidate &= (uid_t) UINT32_C(0xFFFF0000);
4085 }
4086 }
4087
4088 static int add_one_uid_map(
4089 char **p,
4090 uid_t container_uid,
4091 uid_t host_uid,
4092 uid_t range) {
4093
4094 return strextendf(p,
4095 UID_FMT " " UID_FMT " " UID_FMT "\n",
4096 container_uid, host_uid, range);
4097 }
4098
4099 static int make_uid_map_string(
4100 const uid_t bind_user_uid[],
4101 size_t n_bind_user_uid,
4102 size_t offset,
4103 char **ret) {
4104
4105 _cleanup_free_ char *s = NULL;
4106 uid_t previous_uid = 0;
4107 int r;
4108
4109 assert(n_bind_user_uid == 0 || bind_user_uid);
4110 assert(IN_SET(offset, 0, 2)); /* used to switch between UID and GID map */
4111 assert(ret);
4112
4113 /* The bind_user_uid[] array is a series of 4 uid_t values, for each --bind-user= entry one
4114 * quadruplet, consisting of host and container UID + GID. */
4115
4116 for (size_t i = 0; i < n_bind_user_uid; i++) {
4117 uid_t payload_uid = bind_user_uid[i*2+offset],
4118 host_uid = bind_user_uid[i*2+offset+1];
4119
4120 assert(previous_uid <= payload_uid);
4121 assert(payload_uid < arg_uid_range);
4122
4123 /* Add a range to close the gap to previous entry */
4124 if (payload_uid > previous_uid) {
4125 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, payload_uid - previous_uid);
4126 if (r < 0)
4127 return r;
4128 }
4129
4130 /* Map this specific user */
4131 r = add_one_uid_map(&s, payload_uid, host_uid, 1);
4132 if (r < 0)
4133 return r;
4134
4135 previous_uid = payload_uid + 1;
4136 }
4137
4138 /* And add a range to close the gap to finish the range */
4139 if (arg_uid_range > previous_uid) {
4140 r = add_one_uid_map(&s, previous_uid, arg_uid_shift + previous_uid, arg_uid_range - previous_uid);
4141 if (r < 0)
4142 return r;
4143 }
4144
4145 assert(s);
4146
4147 *ret = TAKE_PTR(s);
4148 return 0;
4149 }
4150
4151 static int setup_uid_map(
4152 pid_t pid,
4153 const uid_t bind_user_uid[],
4154 size_t n_bind_user_uid) {
4155
4156 char uid_map[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1];
4157 _cleanup_free_ char *s = NULL;
4158 int r;
4159
4160 assert(pid > 1);
4161
4162 /* Build the UID map string */
4163 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 0, &s) < 0) /* offset=0 contains the UID pair */
4164 return log_oom();
4165
4166 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
4167 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
4168 if (r < 0)
4169 return log_error_errno(r, "Failed to write UID map: %m");
4170
4171 /* And now build the GID map string */
4172 s = mfree(s);
4173 if (make_uid_map_string(bind_user_uid, n_bind_user_uid, 2, &s) < 0) /* offset=2 contains the GID pair */
4174 return log_oom();
4175
4176 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
4177 r = write_string_file(uid_map, s, WRITE_STRING_FILE_DISABLE_BUFFER);
4178 if (r < 0)
4179 return log_error_errno(r, "Failed to write GID map: %m");
4180
4181 return 0;
4182 }
4183
4184 static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
4185 char buf[NOTIFY_BUFFER_MAX+1];
4186 char *p = NULL;
4187 struct iovec iovec = {
4188 .iov_base = buf,
4189 .iov_len = sizeof(buf)-1,
4190 };
4191 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
4192 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control;
4193 struct msghdr msghdr = {
4194 .msg_iov = &iovec,
4195 .msg_iovlen = 1,
4196 .msg_control = &control,
4197 .msg_controllen = sizeof(control),
4198 };
4199 struct ucred *ucred;
4200 ssize_t n;
4201 pid_t inner_child_pid;
4202 _cleanup_strv_free_ char **tags = NULL;
4203 int r;
4204
4205 assert(userdata);
4206
4207 inner_child_pid = PTR_TO_PID(userdata);
4208
4209 if (revents != EPOLLIN) {
4210 log_warning("Got unexpected poll event for notify fd.");
4211 return 0;
4212 }
4213
4214 n = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
4215 if (n < 0) {
4216 if (ERRNO_IS_TRANSIENT(n))
4217 return 0;
4218 if (n == -EXFULL) {
4219 log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
4220 return 0;
4221 }
4222 return log_warning_errno(n, "Couldn't read notification socket: %m");
4223 }
4224
4225 cmsg_close_all(&msghdr);
4226
4227 ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred);
4228 if (!ucred || ucred->pid != inner_child_pid) {
4229 log_debug("Received notify message without valid credentials. Ignoring.");
4230 return 0;
4231 }
4232
4233 if ((size_t) n >= sizeof(buf)) {
4234 log_warning("Received notify message exceeded maximum size. Ignoring.");
4235 return 0;
4236 }
4237
4238 buf[n] = 0;
4239 tags = strv_split(buf, "\n\r");
4240 if (!tags)
4241 return log_oom();
4242
4243 if (strv_contains(tags, "READY=1")) {
4244 r = sd_notify(false, "READY=1\n");
4245 if (r < 0)
4246 log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
4247 }
4248
4249 p = strv_find_startswith(tags, "STATUS=");
4250 if (p)
4251 (void) sd_notifyf(false, "STATUS=Container running: %s", p);
4252
4253 return 0;
4254 }
4255
4256 static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
4257 int r;
4258
4259 r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
4260 if (r < 0)
4261 return log_error_errno(r, "Failed to allocate notify event source: %m");
4262
4263 (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify");
4264
4265 return 0;
4266 }
4267
4268 static int merge_settings(Settings *settings, const char *path) {
4269 int rl;
4270
4271 assert(settings);
4272 assert(path);
4273
4274 /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note
4275 * that this steals the fields of the Settings* structure, and hence modifies it. */
4276
4277 if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
4278 settings->start_mode >= 0) {
4279 arg_start_mode = settings->start_mode;
4280 strv_free_and_replace(arg_parameters, settings->parameters);
4281 }
4282
4283 if ((arg_settings_mask & SETTING_EPHEMERAL) == 0 &&
4284 settings->ephemeral >= 0)
4285 arg_ephemeral = settings->ephemeral;
4286
4287 if ((arg_settings_mask & SETTING_DIRECTORY) == 0 &&
4288 settings->root) {
4289
4290 if (!arg_settings_trusted)
4291 log_warning("Ignoring root directory setting, file %s is not trusted.", path);
4292 else
4293 free_and_replace(arg_directory, settings->root);
4294 }
4295
4296 if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 &&
4297 settings->pivot_root_new) {
4298 free_and_replace(arg_pivot_root_new, settings->pivot_root_new);
4299 free_and_replace(arg_pivot_root_old, settings->pivot_root_old);
4300 }
4301
4302 if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
4303 settings->working_directory)
4304 free_and_replace(arg_chdir, settings->working_directory);
4305
4306 if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
4307 settings->environment)
4308 strv_free_and_replace(arg_setenv, settings->environment);
4309
4310 if ((arg_settings_mask & SETTING_USER) == 0) {
4311
4312 if (settings->user)
4313 free_and_replace(arg_user, settings->user);
4314
4315 if (uid_is_valid(settings->uid))
4316 arg_uid = settings->uid;
4317 if (gid_is_valid(settings->gid))
4318 arg_gid = settings->gid;
4319 if (settings->n_supplementary_gids > 0) {
4320 free_and_replace(arg_supplementary_gids, settings->supplementary_gids);
4321 arg_n_supplementary_gids = settings->n_supplementary_gids;
4322 }
4323 }
4324
4325 if ((arg_settings_mask & SETTING_CAPABILITY) == 0) {
4326 uint64_t plus, minus;
4327 uint64_t network_minus = 0;
4328 uint64_t ambient;
4329
4330 /* Note that we copy both the simple plus/minus caps here, and the full quintet from the
4331 * Settings structure */
4332
4333 plus = settings->capability;
4334 minus = settings->drop_capability;
4335
4336 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
4337 settings_network_configured(settings)) {
4338 if (settings_private_network(settings))
4339 plus |= UINT64_C(1) << CAP_NET_ADMIN;
4340 else
4341 network_minus |= UINT64_C(1) << CAP_NET_ADMIN;
4342 }
4343
4344 if (!arg_settings_trusted && plus != 0) {
4345 if (settings->capability != 0)
4346 log_warning("Ignoring Capability= setting, file %s is not trusted.", path);
4347 } else {
4348 arg_caps_retain &= ~network_minus;
4349 arg_caps_retain |= plus;
4350 }
4351
4352 arg_caps_retain &= ~minus;
4353
4354 /* Copy the full capabilities over too */
4355 if (capability_quintet_is_set(&settings->full_capabilities)) {
4356 if (!arg_settings_trusted)
4357 log_warning("Ignoring capability settings, file %s is not trusted.", path);
4358 else
4359 arg_full_capabilities = settings->full_capabilities;
4360 }
4361
4362 ambient = settings->ambient_capability;
4363 if (!arg_settings_trusted && ambient != 0)
4364 log_warning("Ignoring AmbientCapability= setting, file %s is not trusted.", path);
4365 else
4366 arg_caps_ambient |= ambient;
4367 }
4368
4369 if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 &&
4370 settings->kill_signal > 0)
4371 arg_kill_signal = settings->kill_signal;
4372
4373 if ((arg_settings_mask & SETTING_PERSONALITY) == 0 &&
4374 settings->personality != PERSONALITY_INVALID)
4375 arg_personality = settings->personality;
4376
4377 if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 &&
4378 !sd_id128_is_null(settings->machine_id)) {
4379
4380 if (!arg_settings_trusted)
4381 log_warning("Ignoring MachineID= setting, file %s is not trusted.", path);
4382 else
4383 arg_uuid = settings->machine_id;
4384 }
4385
4386 if ((arg_settings_mask & SETTING_READ_ONLY) == 0 &&
4387 settings->read_only >= 0)
4388 arg_read_only = settings->read_only;
4389
4390 if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 &&
4391 settings->volatile_mode != _VOLATILE_MODE_INVALID)
4392 arg_volatile_mode = settings->volatile_mode;
4393
4394 if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 &&
4395 settings->n_custom_mounts > 0) {
4396
4397 if (!arg_settings_trusted)
4398 log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path);
4399 else {
4400 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
4401 arg_custom_mounts = TAKE_PTR(settings->custom_mounts);
4402 arg_n_custom_mounts = settings->n_custom_mounts;
4403 settings->n_custom_mounts = 0;
4404 }
4405 }
4406
4407 if ((arg_settings_mask & SETTING_NETWORK) == 0 &&
4408 settings_network_configured(settings)) {
4409
4410 if (!arg_settings_trusted)
4411 log_warning("Ignoring network settings, file %s is not trusted.", path);
4412 else {
4413 arg_network_veth = settings_network_veth(settings);
4414 arg_private_network = settings_private_network(settings);
4415
4416 strv_free_and_replace(arg_network_interfaces, settings->network_interfaces);
4417 strv_free_and_replace(arg_network_macvlan, settings->network_macvlan);
4418 strv_free_and_replace(arg_network_ipvlan, settings->network_ipvlan);
4419 strv_free_and_replace(arg_network_veth_extra, settings->network_veth_extra);
4420
4421 free_and_replace(arg_network_bridge, settings->network_bridge);
4422 free_and_replace(arg_network_zone, settings->network_zone);
4423
4424 free_and_replace(arg_network_namespace_path, settings->network_namespace_path);
4425 }
4426 }
4427
4428 if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 &&
4429 settings->expose_ports) {
4430
4431 if (!arg_settings_trusted)
4432 log_warning("Ignoring Port= setting, file %s is not trusted.", path);
4433 else {
4434 expose_port_free_all(arg_expose_ports);
4435 arg_expose_ports = TAKE_PTR(settings->expose_ports);
4436 }
4437 }
4438
4439 if ((arg_settings_mask & SETTING_USERNS) == 0 &&
4440 settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) {
4441
4442 if (!arg_settings_trusted)
4443 log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path);
4444 else {
4445 arg_userns_mode = settings->userns_mode;
4446 arg_uid_shift = settings->uid_shift;
4447 arg_uid_range = settings->uid_range;
4448 arg_userns_ownership = settings->userns_ownership;
4449 }
4450 }
4451
4452 if ((arg_settings_mask & SETTING_BIND_USER) == 0 &&
4453 !strv_isempty(settings->bind_user))
4454 strv_free_and_replace(arg_bind_user, settings->bind_user);
4455
4456 if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0 &&
4457 settings->notify_ready >= 0)
4458 arg_notify_ready = settings->notify_ready;
4459
4460 if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) {
4461
4462 if (!strv_isempty(settings->syscall_allow_list) || !strv_isempty(settings->syscall_deny_list)) {
4463 if (!arg_settings_trusted && !strv_isempty(settings->syscall_allow_list))
4464 log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path);
4465 else {
4466 strv_free_and_replace(arg_syscall_allow_list, settings->syscall_allow_list);
4467 strv_free_and_replace(arg_syscall_deny_list, settings->syscall_deny_list);
4468 }
4469 }
4470
4471 #if HAVE_SECCOMP
4472 if (settings->seccomp) {
4473 if (!arg_settings_trusted)
4474 log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path);
4475 else {
4476 seccomp_release(arg_seccomp);
4477 arg_seccomp = TAKE_PTR(settings->seccomp);
4478 }
4479 }
4480 #endif
4481 }
4482
4483 for (rl = 0; rl < _RLIMIT_MAX; rl ++) {
4484 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)))
4485 continue;
4486
4487 if (!settings->rlimit[rl])
4488 continue;
4489
4490 if (!arg_settings_trusted) {
4491 log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl), path);
4492 continue;
4493 }
4494
4495 free_and_replace(arg_rlimit[rl], settings->rlimit[rl]);
4496 }
4497
4498 if ((arg_settings_mask & SETTING_HOSTNAME) == 0 &&
4499 settings->hostname)
4500 free_and_replace(arg_hostname, settings->hostname);
4501
4502 if ((arg_settings_mask & SETTING_NO_NEW_PRIVILEGES) == 0 &&
4503 settings->no_new_privileges >= 0)
4504 arg_no_new_privileges = settings->no_new_privileges;
4505
4506 if ((arg_settings_mask & SETTING_OOM_SCORE_ADJUST) == 0 &&
4507 settings->oom_score_adjust_set) {
4508
4509 if (!arg_settings_trusted)
4510 log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path);
4511 else {
4512 arg_oom_score_adjust = settings->oom_score_adjust;
4513 arg_oom_score_adjust_set = true;
4514 }
4515 }
4516
4517 if ((arg_settings_mask & SETTING_CPU_AFFINITY) == 0 &&
4518 settings->cpu_set.set) {
4519
4520 if (!arg_settings_trusted)
4521 log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path);
4522 else {
4523 cpu_set_reset(&arg_cpu_set);
4524 arg_cpu_set = settings->cpu_set;
4525 settings->cpu_set = (CPUSet) {};
4526 }
4527 }
4528
4529 if ((arg_settings_mask & SETTING_RESOLV_CONF) == 0 &&
4530 settings->resolv_conf != _RESOLV_CONF_MODE_INVALID)
4531 arg_resolv_conf = settings->resolv_conf;
4532
4533 if ((arg_settings_mask & SETTING_LINK_JOURNAL) == 0 &&
4534 settings->link_journal != _LINK_JOURNAL_INVALID) {
4535
4536 if (!arg_settings_trusted)
4537 log_warning("Ignoring journal link setting, file '%s' is not trusted.", path);
4538 else {
4539 arg_link_journal = settings->link_journal;
4540 arg_link_journal_try = settings->link_journal_try;
4541 }
4542 }
4543
4544 if ((arg_settings_mask & SETTING_TIMEZONE) == 0 &&
4545 settings->timezone != _TIMEZONE_MODE_INVALID)
4546 arg_timezone = settings->timezone;
4547
4548 if ((arg_settings_mask & SETTING_SLICE) == 0 &&
4549 settings->slice) {
4550
4551 if (!arg_settings_trusted)
4552 log_warning("Ignoring slice setting, file '%s' is not trusted.", path);
4553 else
4554 free_and_replace(arg_slice, settings->slice);
4555 }
4556
4557 if ((arg_settings_mask & SETTING_USE_CGNS) == 0 &&
4558 settings->use_cgns >= 0) {
4559
4560 if (!arg_settings_trusted)
4561 log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path);
4562 else
4563 arg_use_cgns = settings->use_cgns;
4564 }
4565
4566 if ((arg_settings_mask & SETTING_CLONE_NS_FLAGS) == 0 &&
4567 settings->clone_ns_flags != ULONG_MAX) {
4568
4569 if (!arg_settings_trusted)
4570 log_warning("Ignoring namespace setting, file '%s' is not trusted.", path);
4571 else
4572 arg_clone_ns_flags = settings->clone_ns_flags;
4573 }
4574
4575 if ((arg_settings_mask & SETTING_CONSOLE_MODE) == 0 &&
4576 settings->console_mode >= 0) {
4577
4578 if (!arg_settings_trusted)
4579 log_warning("Ignoring console mode setting, file '%s' is not trusted.", path);
4580 else
4581 arg_console_mode = settings->console_mode;
4582 }
4583
4584 if ((arg_settings_mask & SETTING_SUPPRESS_SYNC) == 0 &&
4585 settings->suppress_sync >= 0)
4586 arg_suppress_sync = settings->suppress_sync;
4587
4588 /* The following properties can only be set through the OCI settings logic, not from the command line, hence we
4589 * don't consult arg_settings_mask for them. */
4590
4591 sd_bus_message_unref(arg_property_message);
4592 arg_property_message = TAKE_PTR(settings->properties);
4593
4594 arg_console_width = settings->console_width;
4595 arg_console_height = settings->console_height;
4596
4597 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
4598 arg_extra_nodes = TAKE_PTR(settings->extra_nodes);
4599 arg_n_extra_nodes = settings->n_extra_nodes;
4600
4601 return 0;
4602 }
4603
4604 static int load_settings(void) {
4605 _cleanup_(settings_freep) Settings *settings = NULL;
4606 _cleanup_fclose_ FILE *f = NULL;
4607 _cleanup_free_ char *p = NULL;
4608 const char *fn;
4609 int r;
4610
4611 if (arg_oci_bundle)
4612 return 0;
4613
4614 /* If all settings are masked, there's no point in looking for
4615 * the settings file */
4616 if (FLAGS_SET(arg_settings_mask, _SETTINGS_MASK_ALL))
4617 return 0;
4618
4619 fn = strjoina(arg_machine, ".nspawn");
4620
4621 /* We first look in the admin's directories in /etc and /run */
4622 FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") {
4623 _cleanup_free_ char *j = NULL;
4624
4625 j = path_join(i, fn);
4626 if (!j)
4627 return log_oom();
4628
4629 f = fopen(j, "re");
4630 if (f) {
4631 p = TAKE_PTR(j);
4632
4633 /* By default, we trust configuration from /etc and /run */
4634 if (arg_settings_trusted < 0)
4635 arg_settings_trusted = true;
4636
4637 break;
4638 }
4639
4640 if (errno != ENOENT)
4641 return log_error_errno(errno, "Failed to open %s: %m", j);
4642 }
4643
4644 if (!f) {
4645 /* After that, let's look for a file next to the
4646 * actual image we shall boot. */
4647
4648 if (arg_image) {
4649 p = file_in_same_dir(arg_image, fn);
4650 if (!p)
4651 return log_oom();
4652 } else if (arg_directory && !path_equal(arg_directory, "/")) {
4653 p = file_in_same_dir(arg_directory, fn);
4654 if (!p)
4655 return log_oom();
4656 }
4657
4658 if (p) {
4659 f = fopen(p, "re");
4660 if (!f && errno != ENOENT)
4661 return log_error_errno(errno, "Failed to open %s: %m", p);
4662
4663 /* By default, we do not trust configuration from /var/lib/machines */
4664 if (arg_settings_trusted < 0)
4665 arg_settings_trusted = false;
4666 }
4667 }
4668
4669 if (!f)
4670 return 0;
4671
4672 log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted));
4673
4674 r = settings_load(f, p, &settings);
4675 if (r < 0)
4676 return r;
4677
4678 return merge_settings(settings, p);
4679 }
4680
4681 static int load_oci_bundle(void) {
4682 _cleanup_(settings_freep) Settings *settings = NULL;
4683 int r;
4684
4685 if (!arg_oci_bundle)
4686 return 0;
4687
4688 /* By default let's trust OCI bundles */
4689 if (arg_settings_trusted < 0)
4690 arg_settings_trusted = true;
4691
4692 r = oci_load(NULL, arg_oci_bundle, &settings);
4693 if (r < 0)
4694 return r;
4695
4696 return merge_settings(settings, arg_oci_bundle);
4697 }
4698
4699 static int run_container(
4700 DissectedImage *dissected_image,
4701 bool secondary,
4702 FDSet *fds,
4703 char veth_name[IFNAMSIZ], bool *veth_created,
4704 struct ExposeArgs *expose_args,
4705 int *master, pid_t *pid, int *ret) {
4706
4707 static const struct sigaction sa = {
4708 .sa_handler = nop_signal_handler,
4709 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
4710 };
4711
4712 _cleanup_(release_lock_file) LockFile uid_shift_lock = LOCK_FILE_INIT;
4713 _cleanup_close_ int etc_passwd_lock = -1;
4714 _cleanup_close_pair_ int
4715 kmsg_socket_pair[2] = { -1, -1 },
4716 rtnl_socket_pair[2] = { -1, -1 },
4717 pid_socket_pair[2] = { -1, -1 },
4718 uuid_socket_pair[2] = { -1, -1 },
4719 notify_socket_pair[2] = { -1, -1 },
4720 uid_shift_socket_pair[2] = { -1, -1 },
4721 master_pty_socket_pair[2] = { -1, -1 },
4722 unified_cgroup_hierarchy_socket_pair[2] = { -1, -1};
4723
4724 _cleanup_close_ int notify_socket = -1;
4725 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
4726 _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL;
4727 _cleanup_(sd_event_unrefp) sd_event *event = NULL;
4728 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
4729 _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
4730 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
4731 _cleanup_free_ uid_t *bind_user_uid = NULL;
4732 size_t n_bind_user_uid = 0;
4733 ContainerStatus container_status = 0;
4734 int ifi = 0, r;
4735 ssize_t l;
4736 sigset_t mask_chld;
4737 _cleanup_close_ int child_netns_fd = -1;
4738
4739 assert_se(sigemptyset(&mask_chld) == 0);
4740 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
4741
4742 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4743 /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely
4744 * check with getpwuid() if the specific user already exists. Note that /etc might be
4745 * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we
4746 * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are
4747 * really just an extra safety net. We kinda assume that the UID range we allocate from is
4748 * really ours. */
4749
4750 etc_passwd_lock = take_etc_passwd_lock(NULL);
4751 if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS)
4752 return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m");
4753 }
4754
4755 r = barrier_create(&barrier);
4756 if (r < 0)
4757 return log_error_errno(r, "Cannot initialize IPC barrier: %m");
4758
4759 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0)
4760 return log_error_errno(errno, "Failed to create kmsg socket pair: %m");
4761
4762 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0)
4763 return log_error_errno(errno, "Failed to create rtnl socket pair: %m");
4764
4765 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0)
4766 return log_error_errno(errno, "Failed to create pid socket pair: %m");
4767
4768 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0)
4769 return log_error_errno(errno, "Failed to create id socket pair: %m");
4770
4771 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0)
4772 return log_error_errno(errno, "Failed to create notify socket pair: %m");
4773
4774 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, master_pty_socket_pair) < 0)
4775 return log_error_errno(errno, "Failed to create console socket pair: %m");
4776
4777 if (arg_userns_mode != USER_NAMESPACE_NO)
4778 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0)
4779 return log_error_errno(errno, "Failed to create uid shift socket pair: %m");
4780
4781 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN)
4782 if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, unified_cgroup_hierarchy_socket_pair) < 0)
4783 return log_error_errno(errno, "Failed to create unified cgroup socket pair: %m");
4784
4785 /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt
4786 * parent's blocking calls and give it a chance to call wait() and terminate. */
4787 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
4788 if (r < 0)
4789 return log_error_errno(errno, "Failed to change the signal mask: %m");
4790
4791 r = sigaction(SIGCHLD, &sa, NULL);
4792 if (r < 0)
4793 return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
4794
4795 if (arg_network_namespace_path) {
4796 child_netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
4797 if (child_netns_fd < 0)
4798 return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path);
4799
4800 r = fd_is_ns(child_netns_fd, CLONE_NEWNET);
4801 if (r == -EUCLEAN)
4802 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);
4803 else if (r < 0)
4804 return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path);
4805 else if (r == 0)
4806 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
4807 "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path);
4808 }
4809
4810 *pid = raw_clone(SIGCHLD|CLONE_NEWNS);
4811 if (*pid < 0)
4812 return log_error_errno(errno, "clone() failed%s: %m",
4813 errno == EINVAL ?
4814 ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : "");
4815
4816 if (*pid == 0) {
4817 /* The outer child only has a file system namespace. */
4818 barrier_set_role(&barrier, BARRIER_CHILD);
4819
4820 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
4821 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4822 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
4823 uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]);
4824 notify_socket_pair[0] = safe_close(notify_socket_pair[0]);
4825 master_pty_socket_pair[0] = safe_close(master_pty_socket_pair[0]);
4826 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
4827 unified_cgroup_hierarchy_socket_pair[0] = safe_close(unified_cgroup_hierarchy_socket_pair[0]);
4828
4829 (void) reset_all_signal_handlers();
4830 (void) reset_signal_mask();
4831
4832 r = outer_child(&barrier,
4833 arg_directory,
4834 dissected_image,
4835 secondary,
4836 pid_socket_pair[1],
4837 uuid_socket_pair[1],
4838 notify_socket_pair[1],
4839 kmsg_socket_pair[1],
4840 rtnl_socket_pair[1],
4841 uid_shift_socket_pair[1],
4842 master_pty_socket_pair[1],
4843 unified_cgroup_hierarchy_socket_pair[1],
4844 fds,
4845 child_netns_fd);
4846 if (r < 0)
4847 _exit(EXIT_FAILURE);
4848
4849 _exit(EXIT_SUCCESS);
4850 }
4851
4852 barrier_set_role(&barrier, BARRIER_PARENT);
4853
4854 fdset_close(fds);
4855
4856 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
4857 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
4858 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
4859 uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]);
4860 notify_socket_pair[1] = safe_close(notify_socket_pair[1]);
4861 master_pty_socket_pair[1] = safe_close(master_pty_socket_pair[1]);
4862 uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]);
4863 unified_cgroup_hierarchy_socket_pair[1] = safe_close(unified_cgroup_hierarchy_socket_pair[1]);
4864
4865 if (arg_userns_mode != USER_NAMESPACE_NO) {
4866 /* The child just let us know the UID shift it might have read from the image. */
4867 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
4868 if (l < 0)
4869 return log_error_errno(errno, "Failed to read UID shift: %m");
4870 if (l != sizeof arg_uid_shift)
4871 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading UID shift.");
4872
4873 if (arg_userns_mode == USER_NAMESPACE_PICK) {
4874 /* If we are supposed to pick the UID shift, let's try to use the shift read from the
4875 * image, but if that's already in use, pick a new one, and report back to the child,
4876 * which one we now picked. */
4877
4878 r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock);
4879 if (r < 0)
4880 return log_error_errno(r, "Failed to pick suitable UID/GID range: %m");
4881
4882 l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL);
4883 if (l < 0)
4884 return log_error_errno(errno, "Failed to send UID shift: %m");
4885 if (l != sizeof arg_uid_shift)
4886 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write while writing UID shift.");
4887 }
4888
4889 n_bind_user_uid = strv_length(arg_bind_user);
4890 if (n_bind_user_uid > 0) {
4891 /* Right after the UID shift, we'll receive the list of UID mappings for the
4892 * --bind-user= logic. Always a quadruplet of payload and host UID + GID. */
4893
4894 bind_user_uid = new(uid_t, n_bind_user_uid*4);
4895 if (!bind_user_uid)
4896 return log_oom();
4897
4898 for (size_t i = 0; i < n_bind_user_uid; i++) {
4899 l = recv(uid_shift_socket_pair[0], bind_user_uid + i*4, sizeof(uid_t)*4, 0);
4900 if (l < 0)
4901 return log_error_errno(errno, "Failed to read user UID map pair: %m");
4902 if (l != sizeof(uid_t)*4)
4903 return log_full_errno(l == 0 ? LOG_DEBUG : LOG_WARNING,
4904 SYNTHETIC_ERRNO(EIO),
4905 "Short read while reading bind user UID pairs.");
4906 }
4907 }
4908 }
4909
4910 if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
4911 /* The child let us know the support cgroup mode it might have read from the image. */
4912 l = recv(unified_cgroup_hierarchy_socket_pair[0], &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), 0);
4913 if (l < 0)
4914 return log_error_errno(errno, "Failed to read cgroup mode: %m");
4915 if (l != sizeof(arg_unified_cgroup_hierarchy))
4916 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading cgroup mode (%zu bytes).%s",
4917 l, l == 0 ? " The child is most likely dead." : "");
4918 }
4919
4920 /* Wait for the outer child. */
4921 r = wait_for_terminate_and_check("(sd-namespace)", *pid, WAIT_LOG_ABNORMAL);
4922 if (r < 0)
4923 return r;
4924 if (r != EXIT_SUCCESS)
4925 return -EIO;
4926
4927 /* And now retrieve the PID of the inner child. */
4928 l = recv(pid_socket_pair[0], pid, sizeof *pid, 0);
4929 if (l < 0)
4930 return log_error_errno(errno, "Failed to read inner child PID: %m");
4931 if (l != sizeof *pid)
4932 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading inner child PID.");
4933
4934 /* We also retrieve container UUID in case it was generated by outer child */
4935 l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0);
4936 if (l < 0)
4937 return log_error_errno(errno, "Failed to read container machine ID: %m");
4938 if (l != sizeof(arg_uuid))
4939 return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading container machined ID.");
4940
4941 /* We also retrieve the socket used for notifications generated by outer child */
4942 notify_socket = receive_one_fd(notify_socket_pair[0], 0);
4943 if (notify_socket < 0)
4944 return log_error_errno(notify_socket,
4945 "Failed to receive notification socket from the outer child: %m");
4946
4947 log_debug("Init process invoked as PID "PID_FMT, *pid);
4948
4949 if (arg_userns_mode != USER_NAMESPACE_NO) {
4950 if (!barrier_place_and_sync(&barrier)) /* #1 */
4951 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
4952
4953 r = setup_uid_map(*pid, bind_user_uid, n_bind_user_uid);
4954 if (r < 0)
4955 return r;
4956
4957 (void) barrier_place(&barrier); /* #2 */
4958 }
4959
4960 if (arg_private_network) {
4961 if (!arg_network_namespace_path) {
4962 /* Wait until the child has unshared its network namespace. */
4963 if (!barrier_place_and_sync(&barrier)) /* #3 */
4964 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early");
4965 }
4966
4967 if (child_netns_fd < 0) {
4968 /* Make sure we have an open file descriptor to the child's network
4969 * namespace so it stays alive even if the child exits. */
4970 r = namespace_open(*pid, NULL, NULL, &child_netns_fd, NULL, NULL);
4971 if (r < 0)
4972 return log_error_errno(r, "Failed to open child network namespace: %m");
4973 }
4974
4975 r = move_network_interfaces(child_netns_fd, arg_network_interfaces);
4976 if (r < 0)
4977 return r;
4978
4979 if (arg_network_veth) {
4980 r = setup_veth(arg_machine, *pid, veth_name,
4981 arg_network_bridge || arg_network_zone);
4982 if (r < 0)
4983 return r;
4984 else if (r > 0)
4985 ifi = r;
4986
4987 if (arg_network_bridge) {
4988 /* Add the interface to a bridge */
4989 r = setup_bridge(veth_name, arg_network_bridge, false);
4990 if (r < 0)
4991 return r;
4992 if (r > 0)
4993 ifi = r;
4994 } else if (arg_network_zone) {
4995 /* Add the interface to a bridge, possibly creating it */
4996 r = setup_bridge(veth_name, arg_network_zone, true);
4997 if (r < 0)
4998 return r;
4999 if (r > 0)
5000 ifi = r;
5001 }
5002 }
5003
5004 r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra);
5005 if (r < 0)
5006 return r;
5007
5008 /* We created the primary and extra veth links now; let's remember this, so that we know to
5009 remove them later on. Note that we don't bother with removing veth links that were created
5010 here when their setup failed half-way, because in that case the kernel should be able to
5011 remove them on its own, since they cannot be referenced by anything yet. */
5012 *veth_created = true;
5013
5014 r = setup_macvlan(arg_machine, *pid, arg_network_macvlan);
5015 if (r < 0)
5016 return r;
5017
5018 r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan);
5019 if (r < 0)
5020 return r;
5021 }
5022
5023 if (arg_register || !arg_keep_unit) {
5024 r = sd_bus_default_system(&bus);
5025 if (r < 0)
5026 return log_error_errno(r, "Failed to open system bus: %m");
5027
5028 r = sd_bus_set_close_on_exit(bus, false);
5029 if (r < 0)
5030 return log_error_errno(r, "Failed to disable close-on-exit behaviour: %m");
5031 }
5032
5033 if (!arg_keep_unit) {
5034 /* When a new scope is created for this container, then we'll be registered as its controller, in which
5035 * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the
5036 * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */
5037
5038 r = sd_bus_match_signal_async(
5039 bus,
5040 NULL,
5041 "org.freedesktop.systemd1",
5042 NULL,
5043 "org.freedesktop.systemd1.Scope",
5044 "RequestStop",
5045 on_request_stop, NULL, PID_TO_PTR(*pid));
5046 if (r < 0)
5047 return log_error_errno(r, "Failed to request RequestStop match: %m");
5048 }
5049
5050 if (arg_register) {
5051 r = register_machine(
5052 bus,
5053 arg_machine,
5054 *pid,
5055 arg_directory,
5056 arg_uuid,
5057 ifi,
5058 arg_slice,
5059 arg_custom_mounts, arg_n_custom_mounts,
5060 arg_kill_signal,
5061 arg_property,
5062 arg_property_message,
5063 arg_keep_unit,
5064 arg_container_service_name);
5065 if (r < 0)
5066 return r;
5067
5068 } else if (!arg_keep_unit) {
5069 r = allocate_scope(
5070 bus,
5071 arg_machine,
5072 *pid,
5073 arg_slice,
5074 arg_custom_mounts, arg_n_custom_mounts,
5075 arg_kill_signal,
5076 arg_property,
5077 arg_property_message);
5078 if (r < 0)
5079 return r;
5080
5081 } else if (arg_slice || arg_property)
5082 log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect.");
5083
5084 r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy);
5085 if (r < 0)
5086 return r;
5087
5088 r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
5089 if (r < 0)
5090 return r;
5091
5092 r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift);
5093 if (r < 0)
5094 return r;
5095
5096 /* Notify the child that the parent is ready with all
5097 * its setup (including cgroup-ification), and that
5098 * the child can now hand over control to the code to
5099 * run inside the container. */
5100 (void) barrier_place(&barrier); /* #4 */
5101
5102 /* Block SIGCHLD here, before notifying child.
5103 * process_pty() will handle it with the other signals. */
5104 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
5105
5106 /* Reset signal to default */
5107 r = default_signals(SIGCHLD);
5108 if (r < 0)
5109 return log_error_errno(r, "Failed to reset SIGCHLD: %m");
5110
5111 r = sd_event_new(&event);
5112 if (r < 0)
5113 return log_error_errno(r, "Failed to get default event source: %m");
5114
5115 (void) sd_event_set_watchdog(event, true);
5116
5117 if (bus) {
5118 r = sd_bus_attach_event(bus, event, 0);
5119 if (r < 0)
5120 return log_error_errno(r, "Failed to attach bus to event loop: %m");
5121 }
5122
5123 r = setup_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
5124 if (r < 0)
5125 return r;
5126
5127 /* Let the child know that we are ready and wait that the child is completely ready now. */
5128 if (!barrier_place_and_sync(&barrier)) /* #5 */
5129 return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early.");
5130
5131 /* At this point we have made use of the UID we picked, and thus nss-systemd/systemd-machined.service
5132 * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */
5133 etc_passwd_lock = safe_close(etc_passwd_lock);
5134
5135 (void) sd_notifyf(false,
5136 "STATUS=Container running.\n"
5137 "X_NSPAWN_LEADER_PID=" PID_FMT, *pid);
5138 if (!arg_notify_ready) {
5139 r = sd_notify(false, "READY=1\n");
5140 if (r < 0)
5141 log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
5142 }
5143
5144 if (arg_kill_signal > 0) {
5145 /* Try to kill the init system on SIGINT or SIGTERM */
5146 (void) sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid));
5147 (void) sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid));
5148 } else {
5149 /* Immediately exit */
5150 (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
5151 (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
5152 }
5153
5154 /* Exit when the child exits */
5155 (void) sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid));
5156
5157 if (arg_expose_ports) {
5158 r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, expose_args, &rtnl);
5159 if (r < 0)
5160 return r;
5161
5162 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5163 (void) expose_port_execute(rtnl, &expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
5164 }
5165
5166 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
5167
5168 if (arg_console_mode != CONSOLE_PIPE) {
5169 _cleanup_close_ int fd = -1;
5170 PTYForwardFlags flags = 0;
5171
5172 /* Retrieve the master pty allocated by inner child */
5173 fd = receive_one_fd(master_pty_socket_pair[0], 0);
5174 if (fd < 0)
5175 return log_error_errno(fd, "Failed to receive master pty from the inner child: %m");
5176
5177 switch (arg_console_mode) {
5178
5179 case CONSOLE_READ_ONLY:
5180 flags |= PTY_FORWARD_READ_ONLY;
5181
5182 _fallthrough_;
5183
5184 case CONSOLE_INTERACTIVE:
5185 flags |= PTY_FORWARD_IGNORE_VHANGUP;
5186
5187 r = pty_forward_new(event, fd, flags, &forward);
5188 if (r < 0)
5189 return log_error_errno(r, "Failed to create PTY forwarder: %m");
5190
5191 if (arg_console_width != UINT_MAX || arg_console_height != UINT_MAX)
5192 (void) pty_forward_set_width_height(forward,
5193 arg_console_width,
5194 arg_console_height);
5195 break;
5196
5197 default:
5198 assert(arg_console_mode == CONSOLE_PASSIVE);
5199 }
5200
5201 *master = TAKE_FD(fd);
5202 }
5203
5204 r = sd_event_loop(event);
5205 if (r < 0)
5206 return log_error_errno(r, "Failed to run event loop: %m");
5207
5208 if (forward) {
5209 char last_char = 0;
5210
5211 (void) pty_forward_get_last_char(forward, &last_char);
5212 forward = pty_forward_free(forward);
5213
5214 if (!arg_quiet && last_char != '\n')
5215 putc('\n', stdout);
5216 }
5217
5218 /* Kill if it is not dead yet anyway */
5219 if (!arg_register && !arg_keep_unit && bus)
5220 terminate_scope(bus, arg_machine);
5221
5222 /* Normally redundant, but better safe than sorry */
5223 (void) kill(*pid, SIGKILL);
5224
5225 if (arg_private_network) {
5226 /* Move network interfaces back to the parent network namespace. We use `safe_fork`
5227 * to avoid having to move the parent to the child network namespace. */
5228 r = safe_fork(NULL, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
5229 if (r < 0)
5230 return r;
5231
5232 if (r == 0) {
5233 _cleanup_close_ int parent_netns_fd = -1;
5234
5235 r = namespace_open(getpid(), NULL, NULL, &parent_netns_fd, NULL, NULL);
5236 if (r < 0) {
5237 log_error_errno(r, "Failed to open parent network namespace: %m");
5238 _exit(EXIT_FAILURE);
5239 }
5240
5241 r = namespace_enter(-1, -1, child_netns_fd, -1, -1);
5242 if (r < 0) {
5243 log_error_errno(r, "Failed to enter child network namespace: %m");
5244 _exit(EXIT_FAILURE);
5245 }
5246
5247 r = move_network_interfaces(parent_netns_fd, arg_network_interfaces);
5248 if (r < 0)
5249 log_error_errno(r, "Failed to move network interfaces back to parent network namespace: %m");
5250
5251 _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
5252 }
5253 }
5254
5255 r = wait_for_container(TAKE_PID(*pid), &container_status);
5256
5257 /* Tell machined that we are gone. */
5258 if (bus)
5259 (void) unregister_machine(bus, arg_machine);
5260
5261 if (r < 0)
5262 /* We failed to wait for the container, or the container exited abnormally. */
5263 return r;
5264 if (r > 0 || container_status == CONTAINER_TERMINATED) {
5265 /* r > 0 → The container exited with a non-zero status.
5266 * As a special case, we need to replace 133 with a different value,
5267 * because 133 is special-cased in the service file to reboot the container.
5268 * otherwise → The container exited with zero status and a reboot was not requested.
5269 */
5270 if (r == EXIT_FORCE_RESTART)
5271 r = EXIT_FAILURE; /* replace 133 with the general failure code */
5272 *ret = r;
5273 return 0; /* finito */
5274 }
5275
5276 /* CONTAINER_REBOOTED, loop again */
5277
5278 if (arg_keep_unit) {
5279 /* Special handling if we are running as a service: instead of simply
5280 * restarting the machine we want to restart the entire service, so let's
5281 * inform systemd about this with the special exit code 133. The service
5282 * file uses RestartForceExitStatus=133 so that this results in a full
5283 * nspawn restart. This is necessary since we might have cgroup parameters
5284 * set we want to have flushed out. */
5285 *ret = EXIT_FORCE_RESTART;
5286 return 0; /* finito */
5287 }
5288
5289 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET, &expose_args->address4);
5290 expose_port_flush(&expose_args->fw_ctx, arg_expose_ports, AF_INET6, &expose_args->address6);
5291
5292 (void) remove_veth_links(veth_name, arg_network_veth_extra);
5293 *veth_created = false;
5294 return 1; /* loop again */
5295 }
5296
5297 static int initialize_rlimits(void) {
5298 /* The default resource limits the kernel passes to PID 1, as per kernel 5.16. Let's pass our container payload
5299 * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and
5300 * container execution environments. */
5301
5302 static const struct rlimit kernel_defaults[_RLIMIT_MAX] = {
5303 [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY },
5304 [RLIMIT_CORE] = { 0, RLIM_INFINITY },
5305 [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY },
5306 [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY },
5307 [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY },
5308 [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY },
5309 [RLIMIT_MEMLOCK] = { DEFAULT_RLIMIT_MEMLOCK, DEFAULT_RLIMIT_MEMLOCK },
5310 [RLIMIT_MSGQUEUE] = { 819200, 819200 },
5311 [RLIMIT_NICE] = { 0, 0 },
5312 [RLIMIT_NOFILE] = { 1024, 4096 },
5313 [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY },
5314 [RLIMIT_RTPRIO] = { 0, 0 },
5315 [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY },
5316 [RLIMIT_STACK] = { 8388608, RLIM_INFINITY },
5317
5318 /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of
5319 * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them
5320 * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original
5321 * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note
5322 * that PID 1 changes a number of other resource limits during early initialization which is why we
5323 * don't read the other limits from PID 1 but prefer the static table above. */
5324 };
5325
5326 int rl;
5327
5328 for (rl = 0; rl < _RLIMIT_MAX; rl++) {
5329 /* Let's only fill in what the user hasn't explicitly configured anyway */
5330 if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)) == 0) {
5331 const struct rlimit *v;
5332 struct rlimit buffer;
5333
5334 if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) {
5335 /* For these two let's read the limits off PID 1. See above for an explanation. */
5336
5337 if (prlimit(1, rl, NULL, &buffer) < 0)
5338 return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl));
5339
5340 v = &buffer;
5341 } else if (rl == RLIMIT_NOFILE) {
5342 /* We nowadays bump RLIMIT_NOFILE's hard limit early in PID 1 for all
5343 * userspace. Given that nspawn containers are often run without our PID 1,
5344 * let's grant the containers a raised RLIMIT_NOFILE hard limit by default,
5345 * so that container userspace gets similar resources as host userspace
5346 * gets. */
5347 buffer = kernel_defaults[rl];
5348 buffer.rlim_max = MIN((rlim_t) read_nr_open(), (rlim_t) HIGH_RLIMIT_NOFILE);
5349 v = &buffer;
5350 } else
5351 v = kernel_defaults + rl;
5352
5353 arg_rlimit[rl] = newdup(struct rlimit, v, 1);
5354 if (!arg_rlimit[rl])
5355 return log_oom();
5356 }
5357
5358 if (DEBUG_LOGGING) {
5359 _cleanup_free_ char *k = NULL;
5360
5361 (void) rlimit_format(arg_rlimit[rl], &k);
5362 log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl), k);
5363 }
5364 }
5365
5366 return 0;
5367 }
5368
5369 static int cant_be_in_netns(void) {
5370 union sockaddr_union sa = {
5371 .un = {
5372 .sun_family = AF_UNIX,
5373 .sun_path = "/run/udev/control",
5374 },
5375 };
5376 char udev_path[STRLEN("/proc//ns/net") + DECIMAL_STR_MAX(pid_t)];
5377 _cleanup_free_ char *udev_ns = NULL, *our_ns = NULL;
5378 _cleanup_close_ int fd = -1;
5379 struct ucred ucred;
5380 int r;
5381
5382 /* Check if we are in the same netns as udev. If we aren't, then device monitoring (and thus waiting
5383 * for loopback block devices) won't work, and we will hang. Detect this case and exit early with a
5384 * nice message. */
5385
5386 if (!arg_image) /* only matters if --image= us used, i.e. we actually need to use loopback devices */
5387 return 0;
5388
5389 fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
5390 if (fd < 0)
5391 return log_error_errno(errno, "Failed to allocate udev control socket: %m");
5392
5393 if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
5394
5395 if (errno == ENOENT || ERRNO_IS_DISCONNECT(errno))
5396 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5397 "Sorry, but --image= requires access to the host's /run/ hierarchy, since we need access to udev.");
5398
5399 return log_error_errno(errno, "Failed to connect socket to udev control socket: %m");
5400 }
5401
5402 r = getpeercred(fd, &ucred);
5403 if (r < 0)
5404 return log_error_errno(r, "Failed to determine peer of udev control socket: %m");
5405
5406 xsprintf(udev_path, "/proc/" PID_FMT "/ns/net", ucred.pid);
5407 r = readlink_malloc(udev_path, &udev_ns);
5408 if (r < 0)
5409 return log_error_errno(r, "Failed to read network namespace of udev: %m");
5410
5411 r = readlink_malloc("/proc/self/ns/net", &our_ns);
5412 if (r < 0)
5413 return log_error_errno(r, "Failed to read our own network namespace: %m");
5414
5415 if (!streq(our_ns, udev_ns))
5416 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
5417 "Sorry, but --image= is only supported in the main network namespace, since we need access to udev/AF_NETLINK.");
5418 return 0;
5419 }
5420
5421 static int run(int argc, char *argv[]) {
5422 bool secondary = false, remove_directory = false, remove_image = false,
5423 veth_created = false, remove_tmprootdir = false;
5424 _cleanup_close_ int master = -1;
5425 _cleanup_fdset_free_ FDSet *fds = NULL;
5426 int r, n_fd_passed, ret = EXIT_SUCCESS;
5427 char veth_name[IFNAMSIZ] = "";
5428 struct ExposeArgs expose_args = {};
5429 _cleanup_(release_lock_file) LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
5430 char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
5431 _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
5432 _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
5433 _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL;
5434 _cleanup_(fw_ctx_freep) FirewallContext *fw_ctx = NULL;
5435 pid_t pid = 0;
5436
5437 log_parse_environment();
5438 log_open();
5439
5440 r = parse_argv(argc, argv);
5441 if (r <= 0)
5442 goto finish;
5443
5444 if (geteuid() != 0) {
5445 r = log_warning_errno(SYNTHETIC_ERRNO(EPERM),
5446 argc >= 2 ? "Need to be root." :
5447 "Need to be root (and some arguments are usually required).\nHint: try --help");
5448 goto finish;
5449 }
5450
5451 r = cant_be_in_netns();
5452 if (r < 0)
5453 goto finish;
5454
5455 r = initialize_rlimits();
5456 if (r < 0)
5457 goto finish;
5458
5459 r = load_oci_bundle();
5460 if (r < 0)
5461 goto finish;
5462
5463 r = determine_names();
5464 if (r < 0)
5465 goto finish;
5466
5467 r = load_settings();
5468 if (r < 0)
5469 goto finish;
5470
5471 r = cg_unified();
5472 if (r < 0) {
5473 log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
5474 goto finish;
5475 }
5476
5477 r = verify_arguments();
5478 if (r < 0)
5479 goto finish;
5480
5481 /* Reapply environment settings. */
5482 (void) detect_unified_cgroup_hierarchy_from_environment();
5483
5484 /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if
5485 * the result is closed. Note that the container payload child will reset signal mask+handler anyway,
5486 * so just turning this off here means we only turn it off in nspawn itself, not any children. */
5487 (void) ignore_signals(SIGPIPE);
5488
5489 n_fd_passed = sd_listen_fds(false);
5490 if (n_fd_passed > 0) {
5491 r = fdset_new_listen_fds(&fds, false);
5492 if (r < 0) {
5493 log_error_errno(r, "Failed to collect file descriptors: %m");
5494 goto finish;
5495 }
5496 }
5497
5498 /* The "default" umask. This is appropriate for most file and directory
5499 * operations performed by nspawn, and is the umask that will be used for
5500 * the child. Functions like copy_devnodes() change the umask temporarily. */
5501 umask(0022);
5502
5503 if (arg_directory) {
5504 assert(!arg_image);
5505
5506 /* Safety precaution: let's not allow running images from the live host OS image, as long as
5507 * /var from the host will propagate into container dynamically (because bad things happen if
5508 * two systems write to the same /var). Let's allow it for the special cases where /var is
5509 * either copied (i.e. --ephemeral) or replaced (i.e. --volatile=yes|state). */
5510 if (path_equal(arg_directory, "/") && !(arg_ephemeral || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_STATE))) {
5511 log_error("Spawning container on root directory is not supported. Consider using --ephemeral, --volatile=yes or --volatile=state.");
5512 r = -EINVAL;
5513 goto finish;
5514 }
5515
5516 if (arg_ephemeral) {
5517 _cleanup_free_ char *np = NULL;
5518
5519 r = chase_symlinks_and_update(&arg_directory, 0);
5520 if (r < 0)
5521 goto finish;
5522
5523 /* If the specified path is a mount point we generate the new snapshot immediately
5524 * inside it under a random name. However if the specified is not a mount point we
5525 * create the new snapshot in the parent directory, just next to it. */
5526 r = path_is_mount_point(arg_directory, NULL, 0);
5527 if (r < 0) {
5528 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
5529 goto finish;
5530 }
5531 if (r > 0)
5532 r = tempfn_random_child(arg_directory, "machine.", &np);
5533 else
5534 r = tempfn_random(arg_directory, "machine.", &np);
5535 if (r < 0) {
5536 log_error_errno(r, "Failed to generate name for directory snapshot: %m");
5537 goto finish;
5538 }
5539
5540 /* We take an exclusive lock on this image, since it's our private, ephemeral copy
5541 * only owned by us and no one else. */
5542 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
5543 if (r < 0) {
5544 log_error_errno(r, "Failed to lock %s: %m", np);
5545 goto finish;
5546 }
5547
5548 {
5549 BLOCK_SIGNALS(SIGINT);
5550 r = btrfs_subvol_snapshot(arg_directory, np,
5551 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5552 BTRFS_SNAPSHOT_FALLBACK_COPY |
5553 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5554 BTRFS_SNAPSHOT_RECURSIVE |
5555 BTRFS_SNAPSHOT_QUOTA |
5556 BTRFS_SNAPSHOT_SIGINT);
5557 }
5558 if (r == -EINTR) {
5559 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", np);
5560 goto finish;
5561 }
5562 if (r < 0) {
5563 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
5564 goto finish;
5565 }
5566
5567 free_and_replace(arg_directory, np);
5568 remove_directory = true;
5569 } else {
5570 r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0);
5571 if (r < 0)
5572 goto finish;
5573
5574 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5575 if (r == -EBUSY) {
5576 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
5577 goto finish;
5578 }
5579 if (r < 0) {
5580 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
5581 goto finish;
5582 }
5583
5584 if (arg_template) {
5585 r = chase_symlinks_and_update(&arg_template, 0);
5586 if (r < 0)
5587 goto finish;
5588
5589 {
5590 BLOCK_SIGNALS(SIGINT);
5591 r = btrfs_subvol_snapshot(arg_template, arg_directory,
5592 (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
5593 BTRFS_SNAPSHOT_FALLBACK_COPY |
5594 BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
5595 BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
5596 BTRFS_SNAPSHOT_RECURSIVE |
5597 BTRFS_SNAPSHOT_QUOTA |
5598 BTRFS_SNAPSHOT_SIGINT);
5599 }
5600 if (r == -EEXIST)
5601 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5602 "Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
5603 else if (r == -EINTR) {
5604 log_error_errno(r, "Interrupted while copying file system tree to %s, removed again.", arg_directory);
5605 goto finish;
5606 } else if (r < 0) {
5607 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
5608 goto finish;
5609 } else
5610 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
5611 "Populated %s from template %s.", arg_directory, arg_template);
5612 }
5613 }
5614
5615 if (arg_start_mode == START_BOOT) {
5616 _cleanup_free_ char *b = NULL;
5617 const char *p;
5618
5619 if (arg_pivot_root_new) {
5620 b = path_join(arg_directory, arg_pivot_root_new);
5621 if (!b)
5622 return log_oom();
5623
5624 p = b;
5625 } else
5626 p = arg_directory;
5627
5628 if (path_is_os_tree(p) <= 0) {
5629 r = log_error_errno(SYNTHETIC_ERRNO(EINVAL),
5630 "Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p);
5631 goto finish;
5632 }
5633 } else {
5634 _cleanup_free_ char *p = NULL;
5635
5636 if (arg_pivot_root_new)
5637 p = path_join(arg_directory, arg_pivot_root_new, "/usr/");
5638 else
5639 p = path_join(arg_directory, "/usr/");
5640 if (!p)
5641 return log_oom();
5642
5643 if (laccess(p, F_OK) < 0) {
5644 r = log_error_errno(SYNTHETIC_ERRNO(EINVAL),
5645 "Directory %s doesn't look like it has an OS tree (/usr/ directory is missing). Refusing.", arg_directory);
5646 goto finish;
5647 }
5648 }
5649
5650 } else {
5651 DissectImageFlags dissect_image_flags =
5652 DISSECT_IMAGE_GENERIC_ROOT |
5653 DISSECT_IMAGE_REQUIRE_ROOT |
5654 DISSECT_IMAGE_RELAX_VAR_CHECK |
5655 DISSECT_IMAGE_USR_NO_ROOT;
5656 assert(arg_image);
5657 assert(!arg_template);
5658
5659 r = chase_symlinks_and_update(&arg_image, 0);
5660 if (r < 0)
5661 goto finish;
5662
5663 if (arg_ephemeral) {
5664 _cleanup_free_ char *np = NULL;
5665
5666 r = tempfn_random(arg_image, "machine.", &np);
5667 if (r < 0) {
5668 log_error_errno(r, "Failed to generate name for image snapshot: %m");
5669 goto finish;
5670 }
5671
5672 /* Always take an exclusive lock on our own ephemeral copy. */
5673 r = image_path_lock(np, LOCK_EX|LOCK_NB, &tree_global_lock, &tree_local_lock);
5674 if (r < 0) {
5675 r = log_error_errno(r, "Failed to create image lock: %m");
5676 goto finish;
5677 }
5678
5679 {
5680 BLOCK_SIGNALS(SIGINT);
5681 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);
5682 }
5683 if (r == -EINTR) {
5684 log_error_errno(r, "Interrupted while copying image file to %s, removed again.", np);
5685 goto finish;
5686 }
5687 if (r < 0) {
5688 r = log_error_errno(r, "Failed to copy image file: %m");
5689 goto finish;
5690 }
5691
5692 free_and_replace(arg_image, np);
5693 remove_image = true;
5694 } else {
5695 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
5696 if (r == -EBUSY) {
5697 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
5698 goto finish;
5699 }
5700 if (r < 0) {
5701 r = log_error_errno(r, "Failed to create image lock: %m");
5702 goto finish;
5703 }
5704
5705 r = verity_settings_load(
5706 &arg_verity_settings,
5707 arg_image, NULL, NULL);
5708 if (r < 0) {
5709 log_error_errno(r, "Failed to read verity artefacts for %s: %m", arg_image);
5710 goto finish;
5711 }
5712
5713 if (arg_verity_settings.data_path)
5714 dissect_image_flags |= DISSECT_IMAGE_NO_PARTITION_TABLE;
5715 }
5716
5717 if (!mkdtemp(tmprootdir)) {
5718 r = log_error_errno(errno, "Failed to create temporary directory: %m");
5719 goto finish;
5720 }
5721
5722 remove_tmprootdir = true;
5723
5724 arg_directory = strdup(tmprootdir);
5725 if (!arg_directory) {
5726 r = log_oom();
5727 goto finish;
5728 }
5729
5730 r = loop_device_make_by_path(
5731 arg_image,
5732 arg_read_only ? O_RDONLY : O_RDWR,
5733 FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN,
5734 &loop);
5735 if (r < 0) {
5736 log_error_errno(r, "Failed to set up loopback block device: %m");
5737 goto finish;
5738 }
5739
5740 /* Take a LOCK_SH lock on the device, so that udevd doesn't issue BLKRRPART in our back */
5741 r = loop_device_flock(loop, LOCK_SH);
5742 if (r < 0) {
5743 log_error_errno(r, "Failed to take lock on loopback block device: %m");
5744 goto finish;
5745 }
5746
5747 r = dissect_image_and_warn(
5748 loop->fd,
5749 arg_image,
5750 &arg_verity_settings,
5751 NULL,
5752 loop->diskseq,
5753 loop->uevent_seqnum_not_before,
5754 loop->timestamp_not_before,
5755 dissect_image_flags,
5756 &dissected_image);
5757 if (r == -ENOPKG) {
5758 /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */
5759 log_notice("Note that the disk image needs to\n"
5760 " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n"
5761 " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n"
5762 " c) or follow https://systemd.io/DISCOVERABLE_PARTITIONS\n"
5763 " d) or contain a file system without a partition table\n"
5764 "in order to be bootable with systemd-nspawn.");
5765 goto finish;
5766 }
5767 if (r < 0)
5768 goto finish;
5769
5770 r = dissected_image_load_verity_sig_partition(
5771 dissected_image,
5772 loop->fd,
5773 &arg_verity_settings);
5774 if (r < 0)
5775 goto finish;
5776
5777 if (dissected_image->has_verity && !arg_verity_settings.root_hash && !dissected_image->has_verity_sig)
5778 log_notice("Note: image %s contains verity information, but no root hash specified and no embedded "
5779 "root hash signature found! Proceeding without integrity checking.", arg_image);
5780
5781 r = dissected_image_decrypt_interactively(
5782 dissected_image,
5783 NULL,
5784 &arg_verity_settings,
5785 0,
5786 &decrypted_image);
5787 if (r < 0)
5788 goto finish;
5789
5790 /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
5791 if (remove_image && unlink(arg_image) >= 0)
5792 remove_image = false;
5793 }
5794
5795 r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts);
5796 if (r < 0)
5797 goto finish;
5798
5799 if (arg_console_mode < 0)
5800 arg_console_mode =
5801 isatty(STDIN_FILENO) > 0 &&
5802 isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY;
5803
5804 if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */
5805 arg_quiet = true;
5806
5807 if (!arg_quiet)
5808 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
5809 arg_machine, arg_image ?: arg_directory);
5810
5811 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
5812
5813 if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) < 0) {
5814 r = log_error_errno(errno, "Failed to become subreaper: %m");
5815 goto finish;
5816 }
5817
5818 if (arg_expose_ports) {
5819 r = fw_ctx_new(&fw_ctx);
5820 if (r < 0) {
5821 log_error_errno(r, "Cannot expose configured ports, firewall initialization failed: %m");
5822 goto finish;
5823 }
5824 expose_args.fw_ctx = fw_ctx;
5825 }
5826 for (;;) {
5827 r = run_container(dissected_image,
5828 secondary,
5829 fds,
5830 veth_name, &veth_created,
5831 &expose_args, &master,
5832 &pid, &ret);
5833 if (r <= 0)
5834 break;
5835 }
5836
5837 finish:
5838 (void) sd_notify(false,
5839 r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." :
5840 "STOPPING=1\nSTATUS=Terminating...");
5841
5842 if (pid > 0)
5843 (void) kill(pid, SIGKILL);
5844
5845 /* Try to flush whatever is still queued in the pty */
5846 if (master >= 0) {
5847 (void) copy_bytes(master, STDOUT_FILENO, UINT64_MAX, 0);
5848 master = safe_close(master);
5849 }
5850
5851 if (pid > 0)
5852 (void) wait_for_terminate(pid, NULL);
5853
5854 pager_close();
5855
5856 if (remove_directory && arg_directory) {
5857 int k;
5858
5859 k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
5860 if (k < 0)
5861 log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
5862 }
5863
5864 if (remove_image && arg_image) {
5865 if (unlink(arg_image) < 0)
5866 log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
5867 }
5868
5869 if (remove_tmprootdir) {
5870 if (rmdir(tmprootdir) < 0)
5871 log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
5872 }
5873
5874 if (arg_machine) {
5875 const char *p;
5876
5877 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
5878 (void) rm_rf(p, REMOVE_ROOT);
5879 }
5880
5881 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET, &expose_args.address4);
5882 expose_port_flush(&fw_ctx, arg_expose_ports, AF_INET6, &expose_args.address6);
5883
5884 if (veth_created)
5885 (void) remove_veth_links(veth_name, arg_network_veth_extra);
5886 (void) remove_bridge(arg_network_zone);
5887
5888 custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts);
5889 expose_port_free_all(arg_expose_ports);
5890 rlimit_free_all(arg_rlimit);
5891 device_node_array_free(arg_extra_nodes, arg_n_extra_nodes);
5892 credential_free_all(arg_credentials, arg_n_credentials);
5893
5894 if (r < 0)
5895 return r;
5896
5897 return ret;
5898 }
5899
5900 DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
Unnamed repository; edit this file 'description' to name the repository.