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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | ||
3 | #if HAVE_BLKID | |
4 | #include <blkid.h> | |
5 | #endif | |
6 | #include <errno.h> | |
7 | #include <getopt.h> | |
8 | #include <grp.h> | |
9 | #include <linux/fs.h> | |
10 | #include <linux/loop.h> | |
11 | #include <pwd.h> | |
12 | #include <sched.h> | |
13 | #if HAVE_SELINUX | |
14 | #include <selinux/selinux.h> | |
15 | #endif | |
16 | #include <signal.h> | |
17 | #include <stdio.h> | |
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
20 | #include <sys/file.h> | |
21 | #include <sys/personality.h> | |
22 | #include <sys/prctl.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/wait.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "sd-bus.h" | |
28 | #include "sd-daemon.h" | |
29 | #include "sd-id128.h" | |
30 | ||
31 | #include "alloc-util.h" | |
32 | #include "barrier.h" | |
33 | #include "base-filesystem.h" | |
34 | #include "blkid-util.h" | |
35 | #include "btrfs-util.h" | |
36 | #include "bus-error.h" | |
37 | #include "bus-util.h" | |
38 | #include "cap-list.h" | |
39 | #include "capability-util.h" | |
40 | #include "cgroup-util.h" | |
41 | #include "copy.h" | |
42 | #include "cpu-set-util.h" | |
43 | #include "dev-setup.h" | |
44 | #include "dissect-image.h" | |
45 | #include "env-util.h" | |
46 | #include "fd-util.h" | |
47 | #include "fdset.h" | |
48 | #include "fileio.h" | |
49 | #include "format-util.h" | |
50 | #include "fs-util.h" | |
51 | #include "gpt.h" | |
52 | #include "hexdecoct.h" | |
53 | #include "hostname-util.h" | |
54 | #include "id128-util.h" | |
55 | #include "log.h" | |
56 | #include "loop-util.h" | |
57 | #include "loopback-setup.h" | |
58 | #include "machine-image.h" | |
59 | #include "macro.h" | |
60 | #include "main-func.h" | |
61 | #include "missing.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-cgroup.h" | |
68 | #include "nspawn-def.h" | |
69 | #include "nspawn-expose-ports.h" | |
70 | #include "nspawn-mount.h" | |
71 | #include "nspawn-network.h" | |
72 | #include "nspawn-oci.h" | |
73 | #include "nspawn-patch-uid.h" | |
74 | #include "nspawn-register.h" | |
75 | #include "nspawn-seccomp.h" | |
76 | #include "nspawn-settings.h" | |
77 | #include "nspawn-setuid.h" | |
78 | #include "nspawn-stub-pid1.h" | |
79 | #include "nulstr-util.h" | |
80 | #include "os-util.h" | |
81 | #include "pager.h" | |
82 | #include "parse-util.h" | |
83 | #include "path-util.h" | |
84 | #include "pretty-print.h" | |
85 | #include "process-util.h" | |
86 | #include "ptyfwd.h" | |
87 | #include "random-util.h" | |
88 | #include "raw-clone.h" | |
89 | #include "rlimit-util.h" | |
90 | #include "rm-rf.h" | |
91 | #if HAVE_SECCOMP | |
92 | #include "seccomp-util.h" | |
93 | #endif | |
94 | #include "selinux-util.h" | |
95 | #include "signal-util.h" | |
96 | #include "socket-util.h" | |
97 | #include "stat-util.h" | |
98 | #include "stdio-util.h" | |
99 | #include "string-table.h" | |
100 | #include "string-util.h" | |
101 | #include "strv.h" | |
102 | #include "sysctl-util.h" | |
103 | #include "terminal-util.h" | |
104 | #include "tmpfile-util.h" | |
105 | #include "umask-util.h" | |
106 | #include "user-util.h" | |
107 | #include "util.h" | |
108 | ||
109 | #if HAVE_SPLIT_USR | |
110 | #define STATIC_RESOLV_CONF "/lib/systemd/resolv.conf" | |
111 | #else | |
112 | #define STATIC_RESOLV_CONF "/usr/lib/systemd/resolv.conf" | |
113 | #endif | |
114 | ||
115 | /* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path | |
116 | * nspawn_notify_socket_path is relative to the container | |
117 | * the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */ | |
118 | #define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify" | |
119 | ||
120 | #define EXIT_FORCE_RESTART 133 | |
121 | ||
122 | typedef enum ContainerStatus { | |
123 | CONTAINER_TERMINATED, | |
124 | CONTAINER_REBOOTED, | |
125 | } ContainerStatus; | |
126 | ||
127 | static char *arg_directory = NULL; | |
128 | static char *arg_template = NULL; | |
129 | static char *arg_chdir = NULL; | |
130 | static char *arg_pivot_root_new = NULL; | |
131 | static char *arg_pivot_root_old = NULL; | |
132 | static char *arg_user = NULL; | |
133 | static uid_t arg_uid = UID_INVALID; | |
134 | static gid_t arg_gid = GID_INVALID; | |
135 | static gid_t* arg_supplementary_gids = NULL; | |
136 | static size_t arg_n_supplementary_gids = 0; | |
137 | static sd_id128_t arg_uuid = {}; | |
138 | static char *arg_machine = NULL; /* The name used by the host to refer to this */ | |
139 | static char *arg_hostname = NULL; /* The name the payload sees by default */ | |
140 | static const char *arg_selinux_context = NULL; | |
141 | static const char *arg_selinux_apifs_context = NULL; | |
142 | static char *arg_slice = NULL; | |
143 | static bool arg_private_network = false; | |
144 | static bool arg_read_only = false; | |
145 | static StartMode arg_start_mode = START_PID1; | |
146 | static bool arg_ephemeral = false; | |
147 | static LinkJournal arg_link_journal = LINK_AUTO; | |
148 | static bool arg_link_journal_try = false; | |
149 | static uint64_t arg_caps_retain = | |
150 | (1ULL << CAP_AUDIT_CONTROL) | | |
151 | (1ULL << CAP_AUDIT_WRITE) | | |
152 | (1ULL << CAP_CHOWN) | | |
153 | (1ULL << CAP_DAC_OVERRIDE) | | |
154 | (1ULL << CAP_DAC_READ_SEARCH) | | |
155 | (1ULL << CAP_FOWNER) | | |
156 | (1ULL << CAP_FSETID) | | |
157 | (1ULL << CAP_IPC_OWNER) | | |
158 | (1ULL << CAP_KILL) | | |
159 | (1ULL << CAP_LEASE) | | |
160 | (1ULL << CAP_LINUX_IMMUTABLE) | | |
161 | (1ULL << CAP_MKNOD) | | |
162 | (1ULL << CAP_NET_BIND_SERVICE) | | |
163 | (1ULL << CAP_NET_BROADCAST) | | |
164 | (1ULL << CAP_NET_RAW) | | |
165 | (1ULL << CAP_SETFCAP) | | |
166 | (1ULL << CAP_SETGID) | | |
167 | (1ULL << CAP_SETPCAP) | | |
168 | (1ULL << CAP_SETUID) | | |
169 | (1ULL << CAP_SYS_ADMIN) | | |
170 | (1ULL << CAP_SYS_BOOT) | | |
171 | (1ULL << CAP_SYS_CHROOT) | | |
172 | (1ULL << CAP_SYS_NICE) | | |
173 | (1ULL << CAP_SYS_PTRACE) | | |
174 | (1ULL << CAP_SYS_RESOURCE) | | |
175 | (1ULL << CAP_SYS_TTY_CONFIG); | |
176 | static CapabilityQuintet arg_full_capabilities = CAPABILITY_QUINTET_NULL; | |
177 | static CustomMount *arg_custom_mounts = NULL; | |
178 | static size_t arg_n_custom_mounts = 0; | |
179 | static char **arg_setenv = NULL; | |
180 | static bool arg_quiet = false; | |
181 | static bool arg_register = true; | |
182 | static bool arg_keep_unit = false; | |
183 | static char **arg_network_interfaces = NULL; | |
184 | static char **arg_network_macvlan = NULL; | |
185 | static char **arg_network_ipvlan = NULL; | |
186 | static bool arg_network_veth = false; | |
187 | static char **arg_network_veth_extra = NULL; | |
188 | static char *arg_network_bridge = NULL; | |
189 | static char *arg_network_zone = NULL; | |
190 | static char *arg_network_namespace_path = NULL; | |
191 | static PagerFlags arg_pager_flags = 0; | |
192 | static unsigned long arg_personality = PERSONALITY_INVALID; | |
193 | static char *arg_image = NULL; | |
194 | static char *arg_oci_bundle = NULL; | |
195 | static VolatileMode arg_volatile_mode = VOLATILE_NO; | |
196 | static ExposePort *arg_expose_ports = NULL; | |
197 | static char **arg_property = NULL; | |
198 | static sd_bus_message *arg_property_message = NULL; | |
199 | static UserNamespaceMode arg_userns_mode = USER_NAMESPACE_NO; | |
200 | static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U; | |
201 | static bool arg_userns_chown = false; | |
202 | static int arg_kill_signal = 0; | |
203 | static CGroupUnified arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_UNKNOWN; | |
204 | static SettingsMask arg_settings_mask = 0; | |
205 | static int arg_settings_trusted = -1; | |
206 | static char **arg_parameters = NULL; | |
207 | static const char *arg_container_service_name = "systemd-nspawn"; | |
208 | static bool arg_notify_ready = false; | |
209 | static bool arg_use_cgns = true; | |
210 | static unsigned long arg_clone_ns_flags = CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS; | |
211 | static MountSettingsMask arg_mount_settings = MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_TMPFS_TMP; | |
212 | static void *arg_root_hash = NULL; | |
213 | static size_t arg_root_hash_size = 0; | |
214 | static char **arg_syscall_whitelist = NULL; | |
215 | static char **arg_syscall_blacklist = NULL; | |
216 | #if HAVE_SECCOMP | |
217 | static scmp_filter_ctx arg_seccomp = NULL; | |
218 | #endif | |
219 | static struct rlimit *arg_rlimit[_RLIMIT_MAX] = {}; | |
220 | static bool arg_no_new_privileges = false; | |
221 | static int arg_oom_score_adjust = 0; | |
222 | static bool arg_oom_score_adjust_set = false; | |
223 | static CPUSet arg_cpu_set = {}; | |
224 | static ResolvConfMode arg_resolv_conf = RESOLV_CONF_AUTO; | |
225 | static TimezoneMode arg_timezone = TIMEZONE_AUTO; | |
226 | static unsigned arg_console_width = (unsigned) -1, arg_console_height = (unsigned) -1; | |
227 | static DeviceNode* arg_extra_nodes = NULL; | |
228 | static size_t arg_n_extra_nodes = 0; | |
229 | static char **arg_sysctl = NULL; | |
230 | static ConsoleMode arg_console_mode = _CONSOLE_MODE_INVALID; | |
231 | ||
232 | STATIC_DESTRUCTOR_REGISTER(arg_directory, freep); | |
233 | STATIC_DESTRUCTOR_REGISTER(arg_template, freep); | |
234 | STATIC_DESTRUCTOR_REGISTER(arg_chdir, freep); | |
235 | STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_new, freep); | |
236 | STATIC_DESTRUCTOR_REGISTER(arg_pivot_root_old, freep); | |
237 | STATIC_DESTRUCTOR_REGISTER(arg_user, freep); | |
238 | STATIC_DESTRUCTOR_REGISTER(arg_supplementary_gids, freep); | |
239 | STATIC_DESTRUCTOR_REGISTER(arg_machine, freep); | |
240 | STATIC_DESTRUCTOR_REGISTER(arg_hostname, freep); | |
241 | STATIC_DESTRUCTOR_REGISTER(arg_slice, freep); | |
242 | STATIC_DESTRUCTOR_REGISTER(arg_setenv, strv_freep); | |
243 | STATIC_DESTRUCTOR_REGISTER(arg_network_interfaces, strv_freep); | |
244 | STATIC_DESTRUCTOR_REGISTER(arg_network_macvlan, strv_freep); | |
245 | STATIC_DESTRUCTOR_REGISTER(arg_network_ipvlan, strv_freep); | |
246 | STATIC_DESTRUCTOR_REGISTER(arg_network_veth_extra, strv_freep); | |
247 | STATIC_DESTRUCTOR_REGISTER(arg_network_bridge, freep); | |
248 | STATIC_DESTRUCTOR_REGISTER(arg_network_zone, freep); | |
249 | STATIC_DESTRUCTOR_REGISTER(arg_network_namespace_path, freep); | |
250 | STATIC_DESTRUCTOR_REGISTER(arg_image, freep); | |
251 | STATIC_DESTRUCTOR_REGISTER(arg_oci_bundle, freep); | |
252 | STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep); | |
253 | STATIC_DESTRUCTOR_REGISTER(arg_property_message, sd_bus_message_unrefp); | |
254 | STATIC_DESTRUCTOR_REGISTER(arg_parameters, strv_freep); | |
255 | STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep); | |
256 | STATIC_DESTRUCTOR_REGISTER(arg_syscall_whitelist, strv_freep); | |
257 | STATIC_DESTRUCTOR_REGISTER(arg_syscall_blacklist, strv_freep); | |
258 | #if HAVE_SECCOMP | |
259 | STATIC_DESTRUCTOR_REGISTER(arg_seccomp, seccomp_releasep); | |
260 | #endif | |
261 | STATIC_DESTRUCTOR_REGISTER(arg_cpu_set, cpu_set_reset); | |
262 | STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep); | |
263 | ||
264 | static int help(void) { | |
265 | _cleanup_free_ char *link = NULL; | |
266 | int r; | |
267 | ||
268 | (void) pager_open(arg_pager_flags); | |
269 | ||
270 | r = terminal_urlify_man("systemd-nspawn", "1", &link); | |
271 | if (r < 0) | |
272 | return log_oom(); | |
273 | ||
274 | printf("%1$s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n" | |
275 | "Spawn a command or OS in a light-weight container.\n\n" | |
276 | " -h --help Show this help\n" | |
277 | " --version Print version string\n" | |
278 | " -q --quiet Do not show status information\n" | |
279 | " --no-pager Do not pipe output into a pager\n" | |
280 | " --settings=BOOLEAN Load additional settings from .nspawn file\n\n" | |
281 | "%3$sImage:%4$s\n" | |
282 | " -D --directory=PATH Root directory for the container\n" | |
283 | " --template=PATH Initialize root directory from template directory,\n" | |
284 | " if missing\n" | |
285 | " -x --ephemeral Run container with snapshot of root directory, and\n" | |
286 | " remove it after exit\n" | |
287 | " -i --image=PATH Root file system disk image (or device node) for\n" | |
288 | " the container\n" | |
289 | " --oci-bundle=PATH OCI bundle directory\n" | |
290 | " --read-only Mount the root directory read-only\n" | |
291 | " --volatile[=MODE] Run the system in volatile mode\n" | |
292 | " --root-hash=HASH Specify verity root hash for root disk image\n" | |
293 | " --pivot-root=PATH[:PATH]\n" | |
294 | " Pivot root to given directory in the container\n\n" | |
295 | "%3$sExecution:%4$s\n" | |
296 | " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n" | |
297 | " -b --boot Boot up full system (i.e. invoke init)\n" | |
298 | " --chdir=PATH Set working directory in the container\n" | |
299 | " -E --setenv=NAME=VALUE Pass an environment variable to PID 1\n" | |
300 | " -u --user=USER Run the command under specified user or UID\n" | |
301 | " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n" | |
302 | " --notify-ready=BOOLEAN Receive notifications from the child init process\n\n" | |
303 | "%3$sSystem Identity:%4$s\n" | |
304 | " -M --machine=NAME Set the machine name for the container\n" | |
305 | " --hostname=NAME Override the hostname for the container\n" | |
306 | " --uuid=UUID Set a specific machine UUID for the container\n\n" | |
307 | "%3$sProperties:%4$s\n" | |
308 | " -S --slice=SLICE Place the container in the specified slice\n" | |
309 | " --property=NAME=VALUE Set scope unit property\n" | |
310 | " --register=BOOLEAN Register container as machine\n" | |
311 | " --keep-unit Do not register a scope for the machine, reuse\n" | |
312 | " the service unit nspawn is running in\n\n" | |
313 | "%3$sUser Namespacing:%4$s\n" | |
314 | " -U --private-users=pick Run within user namespace, autoselect UID/GID range\n" | |
315 | " --private-users[=UIDBASE[:NUIDS]]\n" | |
316 | " Similar, but with user configured UID/GID range\n" | |
317 | " --private-users-chown Adjust OS tree ownership to private UID/GID range\n\n" | |
318 | "%3$sNetworking:%4$s\n" | |
319 | " --private-network Disable network in container\n" | |
320 | " --network-interface=INTERFACE\n" | |
321 | " Assign an existing network interface to the\n" | |
322 | " container\n" | |
323 | " --network-macvlan=INTERFACE\n" | |
324 | " Create a macvlan network interface based on an\n" | |
325 | " existing network interface to the container\n" | |
326 | " --network-ipvlan=INTERFACE\n" | |
327 | " Create a ipvlan network interface based on an\n" | |
328 | " existing network interface to the container\n" | |
329 | " -n --network-veth Add a virtual Ethernet connection between host\n" | |
330 | " and container\n" | |
331 | " --network-veth-extra=HOSTIF[:CONTAINERIF]\n" | |
332 | " Add an additional virtual Ethernet link between\n" | |
333 | " host and container\n" | |
334 | " --network-bridge=INTERFACE\n" | |
335 | " Add a virtual Ethernet connection to the container\n" | |
336 | " and attach it to an existing bridge on the host\n" | |
337 | " --network-zone=NAME Similar, but attach the new interface to an\n" | |
338 | " an automatically managed bridge interface\n" | |
339 | " --network-namespace-path=PATH\n" | |
340 | " Set network namespace to the one represented by\n" | |
341 | " the specified kernel namespace file node\n" | |
342 | " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n" | |
343 | " Expose a container IP port on the host\n\n" | |
344 | "%3$sSecurity:%4$s\n" | |
345 | " --capability=CAP In addition to the default, retain specified\n" | |
346 | " capability\n" | |
347 | " --drop-capability=CAP Drop the specified capability from the default set\n" | |
348 | " --no-new-privileges Set PR_SET_NO_NEW_PRIVS flag for container payload\n" | |
349 | " --system-call-filter=LIST|~LIST\n" | |
350 | " Permit/prohibit specific system calls\n" | |
351 | " -Z --selinux-context=SECLABEL\n" | |
352 | " Set the SELinux security context to be used by\n" | |
353 | " processes in the container\n" | |
354 | " -L --selinux-apifs-context=SECLABEL\n" | |
355 | " Set the SELinux security context to be used by\n" | |
356 | " API/tmpfs file systems in the container\n\n" | |
357 | "%3$sResources:%4$s\n" | |
358 | " --rlimit=NAME=LIMIT Set a resource limit for the payload\n" | |
359 | " --oom-score-adjust=VALUE\n" | |
360 | " Adjust the OOM score value for the payload\n" | |
361 | " --cpu-affinity=CPUS Adjust the CPU affinity of the container\n" | |
362 | " --personality=ARCH Pick personality for this container\n\n" | |
363 | "%3$sIntegration:%4$s\n" | |
364 | " --resolv-conf=MODE Select mode of /etc/resolv.conf initialization\n" | |
365 | " --timezone=MODE Select mode of /etc/localtime initialization\n" | |
366 | " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n" | |
367 | " host, try-guest, try-host\n" | |
368 | " -j Equivalent to --link-journal=try-guest\n\n" | |
369 | "%3$sMounts:%4$s\n" | |
370 | " --bind=PATH[:PATH[:OPTIONS]]\n" | |
371 | " Bind mount a file or directory from the host into\n" | |
372 | " the container\n" | |
373 | " --bind-ro=PATH[:PATH[:OPTIONS]\n" | |
374 | " Similar, but creates a read-only bind mount\n" | |
375 | " --inaccessible=PATH Over-mount file node with inaccessible node to mask\n" | |
376 | " it\n" | |
377 | " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n" | |
378 | " --overlay=PATH[:PATH...]:PATH\n" | |
379 | " Create an overlay mount from the host to \n" | |
380 | " the container\n" | |
381 | " --overlay-ro=PATH[:PATH...]:PATH\n" | |
382 | " Similar, but creates a read-only overlay mount\n\n" | |
383 | "%3$sInput/Output:%4$s\n" | |
384 | " --console=MODE Select how stdin/stdout/stderr and /dev/console are\n" | |
385 | " set up for the container.\n" | |
386 | " -P --pipe Equivalent to --console=pipe\n" | |
387 | "\nSee the %2$s for details.\n" | |
388 | , program_invocation_short_name | |
389 | , link | |
390 | , ansi_underline(), ansi_normal()); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | static int custom_mount_check_all(void) { | |
396 | size_t i; | |
397 | ||
398 | for (i = 0; i < arg_n_custom_mounts; i++) { | |
399 | CustomMount *m = &arg_custom_mounts[i]; | |
400 | ||
401 | if (path_equal(m->destination, "/") && arg_userns_mode != USER_NAMESPACE_NO) { | |
402 | if (arg_userns_chown) | |
403 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
404 | "--private-users-chown may not be combined with custom root mounts."); | |
405 | else if (arg_uid_shift == UID_INVALID) | |
406 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
407 | "--private-users with automatic UID shift may not be combined with custom root mounts."); | |
408 | } | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static int detect_unified_cgroup_hierarchy_from_environment(void) { | |
415 | const char *e; | |
416 | int r; | |
417 | ||
418 | /* Allow the user to control whether the unified hierarchy is used */ | |
419 | e = getenv("UNIFIED_CGROUP_HIERARCHY"); | |
420 | if (e) { | |
421 | r = parse_boolean(e); | |
422 | if (r < 0) | |
423 | return log_error_errno(r, "Failed to parse $UNIFIED_CGROUP_HIERARCHY."); | |
424 | if (r > 0) | |
425 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL; | |
426 | else | |
427 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static int detect_unified_cgroup_hierarchy_from_image(const char *directory) { | |
434 | int r; | |
435 | ||
436 | /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd in the | |
437 | * image actually supports. */ | |
438 | r = cg_all_unified(); | |
439 | if (r < 0) | |
440 | return log_error_errno(r, "Failed to determine whether we are in all unified mode."); | |
441 | if (r > 0) { | |
442 | /* Unified cgroup hierarchy support was added in 230. Unfortunately the detection | |
443 | * routine only detects 231, so we'll have a false negative here for 230. */ | |
444 | r = systemd_installation_has_version(directory, 230); | |
445 | if (r < 0) | |
446 | return log_error_errno(r, "Failed to determine systemd version in container: %m"); | |
447 | if (r > 0) | |
448 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL; | |
449 | else | |
450 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE; | |
451 | } else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) { | |
452 | /* Mixed cgroup hierarchy support was added in 233 */ | |
453 | r = systemd_installation_has_version(directory, 233); | |
454 | if (r < 0) | |
455 | return log_error_errno(r, "Failed to determine systemd version in container: %m"); | |
456 | if (r > 0) | |
457 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD; | |
458 | else | |
459 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE; | |
460 | } else | |
461 | arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE; | |
462 | ||
463 | log_debug("Using %s hierarchy for container.", | |
464 | arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_NONE ? "legacy" : | |
465 | arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_SYSTEMD ? "hybrid" : "unified"); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | static void parse_share_ns_env(const char *name, unsigned long ns_flag) { | |
471 | int r; | |
472 | ||
473 | r = getenv_bool(name); | |
474 | if (r == -ENXIO) | |
475 | return; | |
476 | if (r < 0) | |
477 | log_warning_errno(r, "Failed to parse %s from environment, defaulting to false.", name); | |
478 | ||
479 | arg_clone_ns_flags = (arg_clone_ns_flags & ~ns_flag) | (r > 0 ? 0 : ns_flag); | |
480 | arg_settings_mask |= SETTING_CLONE_NS_FLAGS; | |
481 | } | |
482 | ||
483 | static void parse_mount_settings_env(void) { | |
484 | const char *e; | |
485 | int r; | |
486 | ||
487 | r = getenv_bool("SYSTEMD_NSPAWN_TMPFS_TMP"); | |
488 | if (r >= 0) | |
489 | SET_FLAG(arg_mount_settings, MOUNT_APPLY_TMPFS_TMP, r > 0); | |
490 | else if (r != -ENXIO) | |
491 | log_warning_errno(r, "Failed to parse $SYSTEMD_NSPAWN_TMPFS_TMP, ignoring: %m"); | |
492 | ||
493 | e = getenv("SYSTEMD_NSPAWN_API_VFS_WRITABLE"); | |
494 | if (!e) | |
495 | return; | |
496 | ||
497 | if (streq(e, "network")) { | |
498 | arg_mount_settings |= MOUNT_APPLY_APIVFS_RO|MOUNT_APPLY_APIVFS_NETNS; | |
499 | return; | |
500 | } | |
501 | ||
502 | r = parse_boolean(e); | |
503 | if (r < 0) { | |
504 | log_warning_errno(r, "Failed to parse SYSTEMD_NSPAWN_API_VFS_WRITABLE from environment, ignoring."); | |
505 | return; | |
506 | } | |
507 | ||
508 | SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_RO, r == 0); | |
509 | SET_FLAG(arg_mount_settings, MOUNT_APPLY_APIVFS_NETNS, false); | |
510 | } | |
511 | ||
512 | static void parse_environment(void) { | |
513 | const char *e; | |
514 | int r; | |
515 | ||
516 | parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC); | |
517 | parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID); | |
518 | parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS); | |
519 | parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_SYSTEM", CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS); | |
520 | ||
521 | parse_mount_settings_env(); | |
522 | ||
523 | /* SYSTEMD_NSPAWN_USE_CGNS=0 can be used to disable CLONE_NEWCGROUP use, | |
524 | * even if it is supported. If not supported, it has no effect. */ | |
525 | if (!cg_ns_supported()) | |
526 | arg_use_cgns = false; | |
527 | else { | |
528 | r = getenv_bool("SYSTEMD_NSPAWN_USE_CGNS"); | |
529 | if (r < 0) { | |
530 | if (r != -ENXIO) | |
531 | log_warning_errno(r, "Failed to parse $SYSTEMD_NSPAWN_USE_CGNS, ignoring: %m"); | |
532 | ||
533 | arg_use_cgns = true; | |
534 | } else { | |
535 | arg_use_cgns = r > 0; | |
536 | arg_settings_mask |= SETTING_USE_CGNS; | |
537 | } | |
538 | } | |
539 | ||
540 | e = getenv("SYSTEMD_NSPAWN_CONTAINER_SERVICE"); | |
541 | if (e) | |
542 | arg_container_service_name = e; | |
543 | ||
544 | detect_unified_cgroup_hierarchy_from_environment(); | |
545 | } | |
546 | ||
547 | static int parse_argv(int argc, char *argv[]) { | |
548 | enum { | |
549 | ARG_VERSION = 0x100, | |
550 | ARG_PRIVATE_NETWORK, | |
551 | ARG_UUID, | |
552 | ARG_READ_ONLY, | |
553 | ARG_CAPABILITY, | |
554 | ARG_DROP_CAPABILITY, | |
555 | ARG_LINK_JOURNAL, | |
556 | ARG_BIND, | |
557 | ARG_BIND_RO, | |
558 | ARG_TMPFS, | |
559 | ARG_OVERLAY, | |
560 | ARG_OVERLAY_RO, | |
561 | ARG_INACCESSIBLE, | |
562 | ARG_SHARE_SYSTEM, | |
563 | ARG_REGISTER, | |
564 | ARG_KEEP_UNIT, | |
565 | ARG_NETWORK_INTERFACE, | |
566 | ARG_NETWORK_MACVLAN, | |
567 | ARG_NETWORK_IPVLAN, | |
568 | ARG_NETWORK_BRIDGE, | |
569 | ARG_NETWORK_ZONE, | |
570 | ARG_NETWORK_VETH_EXTRA, | |
571 | ARG_NETWORK_NAMESPACE_PATH, | |
572 | ARG_PERSONALITY, | |
573 | ARG_VOLATILE, | |
574 | ARG_TEMPLATE, | |
575 | ARG_PROPERTY, | |
576 | ARG_PRIVATE_USERS, | |
577 | ARG_KILL_SIGNAL, | |
578 | ARG_SETTINGS, | |
579 | ARG_CHDIR, | |
580 | ARG_PIVOT_ROOT, | |
581 | ARG_PRIVATE_USERS_CHOWN, | |
582 | ARG_NOTIFY_READY, | |
583 | ARG_ROOT_HASH, | |
584 | ARG_SYSTEM_CALL_FILTER, | |
585 | ARG_RLIMIT, | |
586 | ARG_HOSTNAME, | |
587 | ARG_NO_NEW_PRIVILEGES, | |
588 | ARG_OOM_SCORE_ADJUST, | |
589 | ARG_CPU_AFFINITY, | |
590 | ARG_RESOLV_CONF, | |
591 | ARG_TIMEZONE, | |
592 | ARG_CONSOLE, | |
593 | ARG_PIPE, | |
594 | ARG_OCI_BUNDLE, | |
595 | ARG_NO_PAGER, | |
596 | }; | |
597 | ||
598 | static const struct option options[] = { | |
599 | { "help", no_argument, NULL, 'h' }, | |
600 | { "version", no_argument, NULL, ARG_VERSION }, | |
601 | { "directory", required_argument, NULL, 'D' }, | |
602 | { "template", required_argument, NULL, ARG_TEMPLATE }, | |
603 | { "ephemeral", no_argument, NULL, 'x' }, | |
604 | { "user", required_argument, NULL, 'u' }, | |
605 | { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK }, | |
606 | { "as-pid2", no_argument, NULL, 'a' }, | |
607 | { "boot", no_argument, NULL, 'b' }, | |
608 | { "uuid", required_argument, NULL, ARG_UUID }, | |
609 | { "read-only", no_argument, NULL, ARG_READ_ONLY }, | |
610 | { "capability", required_argument, NULL, ARG_CAPABILITY }, | |
611 | { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY }, | |
612 | { "no-new-privileges", required_argument, NULL, ARG_NO_NEW_PRIVILEGES }, | |
613 | { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL }, | |
614 | { "bind", required_argument, NULL, ARG_BIND }, | |
615 | { "bind-ro", required_argument, NULL, ARG_BIND_RO }, | |
616 | { "tmpfs", required_argument, NULL, ARG_TMPFS }, | |
617 | { "overlay", required_argument, NULL, ARG_OVERLAY }, | |
618 | { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO }, | |
619 | { "inaccessible", required_argument, NULL, ARG_INACCESSIBLE }, | |
620 | { "machine", required_argument, NULL, 'M' }, | |
621 | { "hostname", required_argument, NULL, ARG_HOSTNAME }, | |
622 | { "slice", required_argument, NULL, 'S' }, | |
623 | { "setenv", required_argument, NULL, 'E' }, | |
624 | { "selinux-context", required_argument, NULL, 'Z' }, | |
625 | { "selinux-apifs-context", required_argument, NULL, 'L' }, | |
626 | { "quiet", no_argument, NULL, 'q' }, | |
627 | { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */ | |
628 | { "register", required_argument, NULL, ARG_REGISTER }, | |
629 | { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT }, | |
630 | { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE }, | |
631 | { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN }, | |
632 | { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN }, | |
633 | { "network-veth", no_argument, NULL, 'n' }, | |
634 | { "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA }, | |
635 | { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE }, | |
636 | { "network-zone", required_argument, NULL, ARG_NETWORK_ZONE }, | |
637 | { "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH }, | |
638 | { "personality", required_argument, NULL, ARG_PERSONALITY }, | |
639 | { "image", required_argument, NULL, 'i' }, | |
640 | { "volatile", optional_argument, NULL, ARG_VOLATILE }, | |
641 | { "port", required_argument, NULL, 'p' }, | |
642 | { "property", required_argument, NULL, ARG_PROPERTY }, | |
643 | { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS }, | |
644 | { "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN }, | |
645 | { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL }, | |
646 | { "settings", required_argument, NULL, ARG_SETTINGS }, | |
647 | { "chdir", required_argument, NULL, ARG_CHDIR }, | |
648 | { "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT }, | |
649 | { "notify-ready", required_argument, NULL, ARG_NOTIFY_READY }, | |
650 | { "root-hash", required_argument, NULL, ARG_ROOT_HASH }, | |
651 | { "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER }, | |
652 | { "rlimit", required_argument, NULL, ARG_RLIMIT }, | |
653 | { "oom-score-adjust", required_argument, NULL, ARG_OOM_SCORE_ADJUST }, | |
654 | { "cpu-affinity", required_argument, NULL, ARG_CPU_AFFINITY }, | |
655 | { "resolv-conf", required_argument, NULL, ARG_RESOLV_CONF }, | |
656 | { "timezone", required_argument, NULL, ARG_TIMEZONE }, | |
657 | { "console", required_argument, NULL, ARG_CONSOLE }, | |
658 | { "pipe", no_argument, NULL, ARG_PIPE }, | |
659 | { "oci-bundle", required_argument, NULL, ARG_OCI_BUNDLE }, | |
660 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
661 | {} | |
662 | }; | |
663 | ||
664 | int c, r; | |
665 | const char *p; | |
666 | uint64_t plus = 0, minus = 0; | |
667 | bool mask_all_settings = false, mask_no_settings = false; | |
668 | ||
669 | assert(argc >= 0); | |
670 | assert(argv); | |
671 | ||
672 | while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:nUE:P", options, NULL)) >= 0) | |
673 | switch (c) { | |
674 | ||
675 | case 'h': | |
676 | return help(); | |
677 | ||
678 | case ARG_VERSION: | |
679 | return version(); | |
680 | ||
681 | case 'D': | |
682 | r = parse_path_argument_and_warn(optarg, false, &arg_directory); | |
683 | if (r < 0) | |
684 | return r; | |
685 | ||
686 | arg_settings_mask |= SETTING_DIRECTORY; | |
687 | break; | |
688 | ||
689 | case ARG_TEMPLATE: | |
690 | r = parse_path_argument_and_warn(optarg, false, &arg_template); | |
691 | if (r < 0) | |
692 | return r; | |
693 | ||
694 | arg_settings_mask |= SETTING_DIRECTORY; | |
695 | break; | |
696 | ||
697 | case 'i': | |
698 | r = parse_path_argument_and_warn(optarg, false, &arg_image); | |
699 | if (r < 0) | |
700 | return r; | |
701 | ||
702 | arg_settings_mask |= SETTING_DIRECTORY; | |
703 | break; | |
704 | ||
705 | case ARG_OCI_BUNDLE: | |
706 | r = parse_path_argument_and_warn(optarg, false, &arg_oci_bundle); | |
707 | if (r < 0) | |
708 | return r; | |
709 | ||
710 | break; | |
711 | ||
712 | case 'x': | |
713 | arg_ephemeral = true; | |
714 | arg_settings_mask |= SETTING_EPHEMERAL; | |
715 | break; | |
716 | ||
717 | case 'u': | |
718 | r = free_and_strdup(&arg_user, optarg); | |
719 | if (r < 0) | |
720 | return log_oom(); | |
721 | ||
722 | arg_settings_mask |= SETTING_USER; | |
723 | break; | |
724 | ||
725 | case ARG_NETWORK_ZONE: { | |
726 | char *j; | |
727 | ||
728 | j = strappend("vz-", optarg); | |
729 | if (!j) | |
730 | return log_oom(); | |
731 | ||
732 | if (!ifname_valid(j)) { | |
733 | log_error("Network zone name not valid: %s", j); | |
734 | free(j); | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
738 | free_and_replace(arg_network_zone, j); | |
739 | ||
740 | arg_network_veth = true; | |
741 | arg_private_network = true; | |
742 | arg_settings_mask |= SETTING_NETWORK; | |
743 | break; | |
744 | } | |
745 | ||
746 | case ARG_NETWORK_BRIDGE: | |
747 | ||
748 | if (!ifname_valid(optarg)) | |
749 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
750 | "Bridge interface name not valid: %s", optarg); | |
751 | ||
752 | r = free_and_strdup(&arg_network_bridge, optarg); | |
753 | if (r < 0) | |
754 | return log_oom(); | |
755 | ||
756 | _fallthrough_; | |
757 | case 'n': | |
758 | arg_network_veth = true; | |
759 | arg_private_network = true; | |
760 | arg_settings_mask |= SETTING_NETWORK; | |
761 | break; | |
762 | ||
763 | case ARG_NETWORK_VETH_EXTRA: | |
764 | r = veth_extra_parse(&arg_network_veth_extra, optarg); | |
765 | if (r < 0) | |
766 | return log_error_errno(r, "Failed to parse --network-veth-extra= parameter: %s", optarg); | |
767 | ||
768 | arg_private_network = true; | |
769 | arg_settings_mask |= SETTING_NETWORK; | |
770 | break; | |
771 | ||
772 | case ARG_NETWORK_INTERFACE: | |
773 | if (!ifname_valid(optarg)) | |
774 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
775 | "Network interface name not valid: %s", optarg); | |
776 | ||
777 | if (strv_extend(&arg_network_interfaces, optarg) < 0) | |
778 | return log_oom(); | |
779 | ||
780 | arg_private_network = true; | |
781 | arg_settings_mask |= SETTING_NETWORK; | |
782 | break; | |
783 | ||
784 | case ARG_NETWORK_MACVLAN: | |
785 | ||
786 | if (!ifname_valid(optarg)) | |
787 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
788 | "MACVLAN network interface name not valid: %s", optarg); | |
789 | ||
790 | if (strv_extend(&arg_network_macvlan, optarg) < 0) | |
791 | return log_oom(); | |
792 | ||
793 | arg_private_network = true; | |
794 | arg_settings_mask |= SETTING_NETWORK; | |
795 | break; | |
796 | ||
797 | case ARG_NETWORK_IPVLAN: | |
798 | ||
799 | if (!ifname_valid(optarg)) | |
800 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
801 | "IPVLAN network interface name not valid: %s", optarg); | |
802 | ||
803 | if (strv_extend(&arg_network_ipvlan, optarg) < 0) | |
804 | return log_oom(); | |
805 | ||
806 | _fallthrough_; | |
807 | case ARG_PRIVATE_NETWORK: | |
808 | arg_private_network = true; | |
809 | arg_settings_mask |= SETTING_NETWORK; | |
810 | break; | |
811 | ||
812 | case ARG_NETWORK_NAMESPACE_PATH: | |
813 | r = parse_path_argument_and_warn(optarg, false, &arg_network_namespace_path); | |
814 | if (r < 0) | |
815 | return r; | |
816 | ||
817 | arg_settings_mask |= SETTING_NETWORK; | |
818 | break; | |
819 | ||
820 | case 'b': | |
821 | if (arg_start_mode == START_PID2) | |
822 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
823 | "--boot and --as-pid2 may not be combined."); | |
824 | ||
825 | arg_start_mode = START_BOOT; | |
826 | arg_settings_mask |= SETTING_START_MODE; | |
827 | break; | |
828 | ||
829 | case 'a': | |
830 | if (arg_start_mode == START_BOOT) | |
831 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
832 | "--boot and --as-pid2 may not be combined."); | |
833 | ||
834 | arg_start_mode = START_PID2; | |
835 | arg_settings_mask |= SETTING_START_MODE; | |
836 | break; | |
837 | ||
838 | case ARG_UUID: | |
839 | r = sd_id128_from_string(optarg, &arg_uuid); | |
840 | if (r < 0) | |
841 | return log_error_errno(r, "Invalid UUID: %s", optarg); | |
842 | ||
843 | if (sd_id128_is_null(arg_uuid)) | |
844 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
845 | "Machine UUID may not be all zeroes."); | |
846 | ||
847 | arg_settings_mask |= SETTING_MACHINE_ID; | |
848 | break; | |
849 | ||
850 | case 'S': | |
851 | r = free_and_strdup(&arg_slice, optarg); | |
852 | if (r < 0) | |
853 | return log_oom(); | |
854 | ||
855 | arg_settings_mask |= SETTING_SLICE; | |
856 | break; | |
857 | ||
858 | case 'M': | |
859 | if (isempty(optarg)) | |
860 | arg_machine = mfree(arg_machine); | |
861 | else { | |
862 | if (!machine_name_is_valid(optarg)) | |
863 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
864 | "Invalid machine name: %s", optarg); | |
865 | ||
866 | r = free_and_strdup(&arg_machine, optarg); | |
867 | if (r < 0) | |
868 | return log_oom(); | |
869 | } | |
870 | break; | |
871 | ||
872 | case ARG_HOSTNAME: | |
873 | if (isempty(optarg)) | |
874 | arg_hostname = mfree(arg_hostname); | |
875 | else { | |
876 | if (!hostname_is_valid(optarg, false)) | |
877 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
878 | "Invalid hostname: %s", optarg); | |
879 | ||
880 | r = free_and_strdup(&arg_hostname, optarg); | |
881 | if (r < 0) | |
882 | return log_oom(); | |
883 | } | |
884 | ||
885 | arg_settings_mask |= SETTING_HOSTNAME; | |
886 | break; | |
887 | ||
888 | case 'Z': | |
889 | arg_selinux_context = optarg; | |
890 | break; | |
891 | ||
892 | case 'L': | |
893 | arg_selinux_apifs_context = optarg; | |
894 | break; | |
895 | ||
896 | case ARG_READ_ONLY: | |
897 | arg_read_only = true; | |
898 | arg_settings_mask |= SETTING_READ_ONLY; | |
899 | break; | |
900 | ||
901 | case ARG_CAPABILITY: | |
902 | case ARG_DROP_CAPABILITY: { | |
903 | p = optarg; | |
904 | for (;;) { | |
905 | _cleanup_free_ char *t = NULL; | |
906 | ||
907 | r = extract_first_word(&p, &t, ",", 0); | |
908 | if (r < 0) | |
909 | return log_error_errno(r, "Failed to parse capability %s.", t); | |
910 | if (r == 0) | |
911 | break; | |
912 | ||
913 | if (streq(t, "all")) { | |
914 | if (c == ARG_CAPABILITY) | |
915 | plus = (uint64_t) -1; | |
916 | else | |
917 | minus = (uint64_t) -1; | |
918 | } else { | |
919 | r = capability_from_name(t); | |
920 | if (r < 0) | |
921 | return log_error_errno(r, "Failed to parse capability %s.", t); | |
922 | ||
923 | if (c == ARG_CAPABILITY) | |
924 | plus |= 1ULL << r; | |
925 | else | |
926 | minus |= 1ULL << r; | |
927 | } | |
928 | } | |
929 | ||
930 | arg_settings_mask |= SETTING_CAPABILITY; | |
931 | break; | |
932 | } | |
933 | ||
934 | case ARG_NO_NEW_PRIVILEGES: | |
935 | r = parse_boolean(optarg); | |
936 | if (r < 0) | |
937 | return log_error_errno(r, "Failed to parse --no-new-privileges= argument: %s", optarg); | |
938 | ||
939 | arg_no_new_privileges = r; | |
940 | arg_settings_mask |= SETTING_NO_NEW_PRIVILEGES; | |
941 | break; | |
942 | ||
943 | case 'j': | |
944 | arg_link_journal = LINK_GUEST; | |
945 | arg_link_journal_try = true; | |
946 | arg_settings_mask |= SETTING_LINK_JOURNAL; | |
947 | break; | |
948 | ||
949 | case ARG_LINK_JOURNAL: | |
950 | r = parse_link_journal(optarg, &arg_link_journal, &arg_link_journal_try); | |
951 | if (r < 0) | |
952 | return log_error_errno(r, "Failed to parse link journal mode %s", optarg); | |
953 | ||
954 | arg_settings_mask |= SETTING_LINK_JOURNAL; | |
955 | break; | |
956 | ||
957 | case ARG_BIND: | |
958 | case ARG_BIND_RO: | |
959 | r = bind_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_BIND_RO); | |
960 | if (r < 0) | |
961 | return log_error_errno(r, "Failed to parse --bind(-ro)= argument %s: %m", optarg); | |
962 | ||
963 | arg_settings_mask |= SETTING_CUSTOM_MOUNTS; | |
964 | break; | |
965 | ||
966 | case ARG_TMPFS: | |
967 | r = tmpfs_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg); | |
968 | if (r < 0) | |
969 | return log_error_errno(r, "Failed to parse --tmpfs= argument %s: %m", optarg); | |
970 | ||
971 | arg_settings_mask |= SETTING_CUSTOM_MOUNTS; | |
972 | break; | |
973 | ||
974 | case ARG_OVERLAY: | |
975 | case ARG_OVERLAY_RO: | |
976 | r = overlay_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg, c == ARG_OVERLAY_RO); | |
977 | if (r == -EADDRNOTAVAIL) | |
978 | return log_error_errno(r, "--overlay(-ro)= needs at least two colon-separated directories specified."); | |
979 | if (r < 0) | |
980 | return log_error_errno(r, "Failed to parse --overlay(-ro)= argument %s: %m", optarg); | |
981 | ||
982 | arg_settings_mask |= SETTING_CUSTOM_MOUNTS; | |
983 | break; | |
984 | ||
985 | case ARG_INACCESSIBLE: | |
986 | r = inaccessible_mount_parse(&arg_custom_mounts, &arg_n_custom_mounts, optarg); | |
987 | if (r < 0) | |
988 | return log_error_errno(r, "Failed to parse --inaccessible= argument %s: %m", optarg); | |
989 | ||
990 | arg_settings_mask |= SETTING_CUSTOM_MOUNTS; | |
991 | break; | |
992 | ||
993 | case 'E': { | |
994 | char **n; | |
995 | ||
996 | if (!env_assignment_is_valid(optarg)) | |
997 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
998 | "Environment variable assignment '%s' is not valid.", optarg); | |
999 | ||
1000 | n = strv_env_set(arg_setenv, optarg); | |
1001 | if (!n) | |
1002 | return log_oom(); | |
1003 | ||
1004 | strv_free_and_replace(arg_setenv, n); | |
1005 | arg_settings_mask |= SETTING_ENVIRONMENT; | |
1006 | break; | |
1007 | } | |
1008 | ||
1009 | case 'q': | |
1010 | arg_quiet = true; | |
1011 | break; | |
1012 | ||
1013 | case ARG_SHARE_SYSTEM: | |
1014 | /* We don't officially support this anymore, except for compat reasons. People should use the | |
1015 | * $SYSTEMD_NSPAWN_SHARE_* environment variables instead. */ | |
1016 | log_warning("Please do not use --share-system anymore, use $SYSTEMD_NSPAWN_SHARE_* instead."); | |
1017 | arg_clone_ns_flags = 0; | |
1018 | break; | |
1019 | ||
1020 | case ARG_REGISTER: | |
1021 | r = parse_boolean(optarg); | |
1022 | if (r < 0) { | |
1023 | log_error("Failed to parse --register= argument: %s", optarg); | |
1024 | return r; | |
1025 | } | |
1026 | ||
1027 | arg_register = r; | |
1028 | break; | |
1029 | ||
1030 | case ARG_KEEP_UNIT: | |
1031 | arg_keep_unit = true; | |
1032 | break; | |
1033 | ||
1034 | case ARG_PERSONALITY: | |
1035 | ||
1036 | arg_personality = personality_from_string(optarg); | |
1037 | if (arg_personality == PERSONALITY_INVALID) | |
1038 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1039 | "Unknown or unsupported personality '%s'.", optarg); | |
1040 | ||
1041 | arg_settings_mask |= SETTING_PERSONALITY; | |
1042 | break; | |
1043 | ||
1044 | case ARG_VOLATILE: | |
1045 | ||
1046 | if (!optarg) | |
1047 | arg_volatile_mode = VOLATILE_YES; | |
1048 | else if (streq(optarg, "help")) { | |
1049 | DUMP_STRING_TABLE(volatile_mode, VolatileMode, _VOLATILE_MODE_MAX); | |
1050 | return 0; | |
1051 | } else { | |
1052 | VolatileMode m; | |
1053 | ||
1054 | m = volatile_mode_from_string(optarg); | |
1055 | if (m < 0) | |
1056 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1057 | "Failed to parse --volatile= argument: %s", optarg); | |
1058 | else | |
1059 | arg_volatile_mode = m; | |
1060 | } | |
1061 | ||
1062 | arg_settings_mask |= SETTING_VOLATILE_MODE; | |
1063 | break; | |
1064 | ||
1065 | case 'p': | |
1066 | r = expose_port_parse(&arg_expose_ports, optarg); | |
1067 | if (r == -EEXIST) | |
1068 | return log_error_errno(r, "Duplicate port specification: %s", optarg); | |
1069 | if (r < 0) | |
1070 | return log_error_errno(r, "Failed to parse host port %s: %m", optarg); | |
1071 | ||
1072 | arg_settings_mask |= SETTING_EXPOSE_PORTS; | |
1073 | break; | |
1074 | ||
1075 | case ARG_PROPERTY: | |
1076 | if (strv_extend(&arg_property, optarg) < 0) | |
1077 | return log_oom(); | |
1078 | ||
1079 | break; | |
1080 | ||
1081 | case ARG_PRIVATE_USERS: { | |
1082 | int boolean = -1; | |
1083 | ||
1084 | if (!optarg) | |
1085 | boolean = true; | |
1086 | else if (!in_charset(optarg, DIGITS)) | |
1087 | /* do *not* parse numbers as booleans */ | |
1088 | boolean = parse_boolean(optarg); | |
1089 | ||
1090 | if (boolean == false) { | |
1091 | /* no: User namespacing off */ | |
1092 | arg_userns_mode = USER_NAMESPACE_NO; | |
1093 | arg_uid_shift = UID_INVALID; | |
1094 | arg_uid_range = UINT32_C(0x10000); | |
1095 | } else if (boolean == true) { | |
1096 | /* yes: User namespacing on, UID range is read from root dir */ | |
1097 | arg_userns_mode = USER_NAMESPACE_FIXED; | |
1098 | arg_uid_shift = UID_INVALID; | |
1099 | arg_uid_range = UINT32_C(0x10000); | |
1100 | } else if (streq(optarg, "pick")) { | |
1101 | /* pick: User namespacing on, UID range is picked randomly */ | |
1102 | arg_userns_mode = USER_NAMESPACE_PICK; | |
1103 | arg_uid_shift = UID_INVALID; | |
1104 | arg_uid_range = UINT32_C(0x10000); | |
1105 | } else { | |
1106 | _cleanup_free_ char *buffer = NULL; | |
1107 | const char *range, *shift; | |
1108 | ||
1109 | /* anything else: User namespacing on, UID range is explicitly configured */ | |
1110 | ||
1111 | range = strchr(optarg, ':'); | |
1112 | if (range) { | |
1113 | buffer = strndup(optarg, range - optarg); | |
1114 | if (!buffer) | |
1115 | return log_oom(); | |
1116 | shift = buffer; | |
1117 | ||
1118 | range++; | |
1119 | r = safe_atou32(range, &arg_uid_range); | |
1120 | if (r < 0) | |
1121 | return log_error_errno(r, "Failed to parse UID range \"%s\": %m", range); | |
1122 | } else | |
1123 | shift = optarg; | |
1124 | ||
1125 | r = parse_uid(shift, &arg_uid_shift); | |
1126 | if (r < 0) | |
1127 | return log_error_errno(r, "Failed to parse UID \"%s\": %m", optarg); | |
1128 | ||
1129 | arg_userns_mode = USER_NAMESPACE_FIXED; | |
1130 | } | |
1131 | ||
1132 | if (arg_uid_range <= 0) | |
1133 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1134 | "UID range cannot be 0."); | |
1135 | ||
1136 | arg_settings_mask |= SETTING_USERNS; | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | case 'U': | |
1141 | if (userns_supported()) { | |
1142 | arg_userns_mode = USER_NAMESPACE_PICK; | |
1143 | arg_uid_shift = UID_INVALID; | |
1144 | arg_uid_range = UINT32_C(0x10000); | |
1145 | ||
1146 | arg_settings_mask |= SETTING_USERNS; | |
1147 | } | |
1148 | ||
1149 | break; | |
1150 | ||
1151 | case ARG_PRIVATE_USERS_CHOWN: | |
1152 | arg_userns_chown = true; | |
1153 | ||
1154 | arg_settings_mask |= SETTING_USERNS; | |
1155 | break; | |
1156 | ||
1157 | case ARG_KILL_SIGNAL: | |
1158 | if (streq(optarg, "help")) { | |
1159 | DUMP_STRING_TABLE(signal, int, _NSIG); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | arg_kill_signal = signal_from_string(optarg); | |
1164 | if (arg_kill_signal < 0) | |
1165 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1166 | "Cannot parse signal: %s", optarg); | |
1167 | ||
1168 | arg_settings_mask |= SETTING_KILL_SIGNAL; | |
1169 | break; | |
1170 | ||
1171 | case ARG_SETTINGS: | |
1172 | ||
1173 | /* no → do not read files | |
1174 | * yes → read files, do not override cmdline, trust only subset | |
1175 | * override → read files, override cmdline, trust only subset | |
1176 | * trusted → read files, do not override cmdline, trust all | |
1177 | */ | |
1178 | ||
1179 | r = parse_boolean(optarg); | |
1180 | if (r < 0) { | |
1181 | if (streq(optarg, "trusted")) { | |
1182 | mask_all_settings = false; | |
1183 | mask_no_settings = false; | |
1184 | arg_settings_trusted = true; | |
1185 | ||
1186 | } else if (streq(optarg, "override")) { | |
1187 | mask_all_settings = false; | |
1188 | mask_no_settings = true; | |
1189 | arg_settings_trusted = -1; | |
1190 | } else | |
1191 | return log_error_errno(r, "Failed to parse --settings= argument: %s", optarg); | |
1192 | } else if (r > 0) { | |
1193 | /* yes */ | |
1194 | mask_all_settings = false; | |
1195 | mask_no_settings = false; | |
1196 | arg_settings_trusted = -1; | |
1197 | } else { | |
1198 | /* no */ | |
1199 | mask_all_settings = true; | |
1200 | mask_no_settings = false; | |
1201 | arg_settings_trusted = false; | |
1202 | } | |
1203 | ||
1204 | break; | |
1205 | ||
1206 | case ARG_CHDIR: | |
1207 | if (!path_is_absolute(optarg)) | |
1208 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1209 | "Working directory %s is not an absolute path.", optarg); | |
1210 | ||
1211 | r = free_and_strdup(&arg_chdir, optarg); | |
1212 | if (r < 0) | |
1213 | return log_oom(); | |
1214 | ||
1215 | arg_settings_mask |= SETTING_WORKING_DIRECTORY; | |
1216 | break; | |
1217 | ||
1218 | case ARG_PIVOT_ROOT: | |
1219 | r = pivot_root_parse(&arg_pivot_root_new, &arg_pivot_root_old, optarg); | |
1220 | if (r < 0) | |
1221 | return log_error_errno(r, "Failed to parse --pivot-root= argument %s: %m", optarg); | |
1222 | ||
1223 | arg_settings_mask |= SETTING_PIVOT_ROOT; | |
1224 | break; | |
1225 | ||
1226 | case ARG_NOTIFY_READY: | |
1227 | r = parse_boolean(optarg); | |
1228 | if (r < 0) | |
1229 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1230 | "%s is not a valid notify mode. Valid modes are: yes, no, and ready.", optarg); | |
1231 | arg_notify_ready = r; | |
1232 | arg_settings_mask |= SETTING_NOTIFY_READY; | |
1233 | break; | |
1234 | ||
1235 | case ARG_ROOT_HASH: { | |
1236 | void *k; | |
1237 | size_t l; | |
1238 | ||
1239 | r = unhexmem(optarg, strlen(optarg), &k, &l); | |
1240 | if (r < 0) | |
1241 | return log_error_errno(r, "Failed to parse root hash: %s", optarg); | |
1242 | if (l < sizeof(sd_id128_t)) { | |
1243 | free(k); | |
1244 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg); | |
1245 | } | |
1246 | ||
1247 | free(arg_root_hash); | |
1248 | arg_root_hash = k; | |
1249 | arg_root_hash_size = l; | |
1250 | break; | |
1251 | } | |
1252 | ||
1253 | case ARG_SYSTEM_CALL_FILTER: { | |
1254 | bool negative; | |
1255 | const char *items; | |
1256 | ||
1257 | negative = optarg[0] == '~'; | |
1258 | items = negative ? optarg + 1 : optarg; | |
1259 | ||
1260 | for (;;) { | |
1261 | _cleanup_free_ char *word = NULL; | |
1262 | ||
1263 | r = extract_first_word(&items, &word, NULL, 0); | |
1264 | if (r == 0) | |
1265 | break; | |
1266 | if (r == -ENOMEM) | |
1267 | return log_oom(); | |
1268 | if (r < 0) | |
1269 | return log_error_errno(r, "Failed to parse system call filter: %m"); | |
1270 | ||
1271 | if (negative) | |
1272 | r = strv_extend(&arg_syscall_blacklist, word); | |
1273 | else | |
1274 | r = strv_extend(&arg_syscall_whitelist, word); | |
1275 | if (r < 0) | |
1276 | return log_oom(); | |
1277 | } | |
1278 | ||
1279 | arg_settings_mask |= SETTING_SYSCALL_FILTER; | |
1280 | break; | |
1281 | } | |
1282 | ||
1283 | case ARG_RLIMIT: { | |
1284 | const char *eq; | |
1285 | char *name; | |
1286 | int rl; | |
1287 | ||
1288 | if (streq(optarg, "help")) { | |
1289 | DUMP_STRING_TABLE(rlimit, int, _RLIMIT_MAX); | |
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | eq = strchr(optarg, '='); | |
1294 | if (!eq) | |
1295 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1296 | "--rlimit= expects an '=' assignment."); | |
1297 | ||
1298 | name = strndup(optarg, eq - optarg); | |
1299 | if (!name) | |
1300 | return log_oom(); | |
1301 | ||
1302 | rl = rlimit_from_string_harder(name); | |
1303 | if (rl < 0) | |
1304 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1305 | "Unknown resource limit: %s", name); | |
1306 | ||
1307 | if (!arg_rlimit[rl]) { | |
1308 | arg_rlimit[rl] = new0(struct rlimit, 1); | |
1309 | if (!arg_rlimit[rl]) | |
1310 | return log_oom(); | |
1311 | } | |
1312 | ||
1313 | r = rlimit_parse(rl, eq + 1, arg_rlimit[rl]); | |
1314 | if (r < 0) | |
1315 | return log_error_errno(r, "Failed to parse resource limit: %s", eq + 1); | |
1316 | ||
1317 | arg_settings_mask |= SETTING_RLIMIT_FIRST << rl; | |
1318 | break; | |
1319 | } | |
1320 | ||
1321 | case ARG_OOM_SCORE_ADJUST: | |
1322 | r = parse_oom_score_adjust(optarg, &arg_oom_score_adjust); | |
1323 | if (r < 0) | |
1324 | return log_error_errno(r, "Failed to parse --oom-score-adjust= parameter: %s", optarg); | |
1325 | ||
1326 | arg_oom_score_adjust_set = true; | |
1327 | arg_settings_mask |= SETTING_OOM_SCORE_ADJUST; | |
1328 | break; | |
1329 | ||
1330 | case ARG_CPU_AFFINITY: { | |
1331 | CPUSet cpuset; | |
1332 | ||
1333 | r = parse_cpu_set(optarg, &cpuset); | |
1334 | if (r < 0) | |
1335 | return log_error_errno(r, "Failed to parse CPU affinity mask %s: %m", optarg); | |
1336 | ||
1337 | cpu_set_reset(&arg_cpu_set); | |
1338 | arg_cpu_set = cpuset; | |
1339 | arg_settings_mask |= SETTING_CPU_AFFINITY; | |
1340 | break; | |
1341 | } | |
1342 | ||
1343 | case ARG_RESOLV_CONF: | |
1344 | if (streq(optarg, "help")) { | |
1345 | DUMP_STRING_TABLE(resolv_conf_mode, ResolvConfMode, _RESOLV_CONF_MODE_MAX); | |
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | arg_resolv_conf = resolv_conf_mode_from_string(optarg); | |
1350 | if (arg_resolv_conf < 0) | |
1351 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1352 | "Failed to parse /etc/resolv.conf mode: %s", optarg); | |
1353 | ||
1354 | arg_settings_mask |= SETTING_RESOLV_CONF; | |
1355 | break; | |
1356 | ||
1357 | case ARG_TIMEZONE: | |
1358 | if (streq(optarg, "help")) { | |
1359 | DUMP_STRING_TABLE(timezone_mode, TimezoneMode, _TIMEZONE_MODE_MAX); | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | arg_timezone = timezone_mode_from_string(optarg); | |
1364 | if (arg_timezone < 0) | |
1365 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1366 | "Failed to parse /etc/localtime mode: %s", optarg); | |
1367 | ||
1368 | arg_settings_mask |= SETTING_TIMEZONE; | |
1369 | break; | |
1370 | ||
1371 | case ARG_CONSOLE: | |
1372 | if (streq(optarg, "interactive")) | |
1373 | arg_console_mode = CONSOLE_INTERACTIVE; | |
1374 | else if (streq(optarg, "read-only")) | |
1375 | arg_console_mode = CONSOLE_READ_ONLY; | |
1376 | else if (streq(optarg, "passive")) | |
1377 | arg_console_mode = CONSOLE_PASSIVE; | |
1378 | else if (streq(optarg, "pipe")) | |
1379 | arg_console_mode = CONSOLE_PIPE; | |
1380 | else if (streq(optarg, "help")) | |
1381 | puts("interactive\n" | |
1382 | "read-only\n" | |
1383 | "passive\n" | |
1384 | "pipe"); | |
1385 | else | |
1386 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown console mode: %s", optarg); | |
1387 | ||
1388 | arg_settings_mask |= SETTING_CONSOLE_MODE; | |
1389 | break; | |
1390 | ||
1391 | case 'P': | |
1392 | case ARG_PIPE: | |
1393 | arg_console_mode = CONSOLE_PIPE; | |
1394 | arg_settings_mask |= SETTING_CONSOLE_MODE; | |
1395 | break; | |
1396 | ||
1397 | case ARG_NO_PAGER: | |
1398 | arg_pager_flags |= PAGER_DISABLE; | |
1399 | break; | |
1400 | ||
1401 | case '?': | |
1402 | return -EINVAL; | |
1403 | ||
1404 | default: | |
1405 | assert_not_reached("Unhandled option"); | |
1406 | } | |
1407 | ||
1408 | if (argc > optind) { | |
1409 | strv_free(arg_parameters); | |
1410 | arg_parameters = strv_copy(argv + optind); | |
1411 | if (!arg_parameters) | |
1412 | return log_oom(); | |
1413 | ||
1414 | arg_settings_mask |= SETTING_START_MODE; | |
1415 | } | |
1416 | ||
1417 | if (arg_ephemeral && arg_template && !arg_directory) | |
1418 | /* User asked for ephemeral execution but specified --template= instead of --directory=. Semantically | |
1419 | * such an invocation makes some sense, see https://github.com/systemd/systemd/issues/3667. Let's | |
1420 | * accept this here, and silently make "--ephemeral --template=" equivalent to "--ephemeral | |
1421 | * --directory=". */ | |
1422 | arg_directory = TAKE_PTR(arg_template); | |
1423 | ||
1424 | arg_caps_retain = (arg_caps_retain | plus | (arg_private_network ? UINT64_C(1) << CAP_NET_ADMIN : 0)) & ~minus; | |
1425 | ||
1426 | /* Make sure to parse environment before we reset the settings mask below */ | |
1427 | parse_environment(); | |
1428 | ||
1429 | /* Load all settings from .nspawn files */ | |
1430 | if (mask_no_settings) | |
1431 | arg_settings_mask = 0; | |
1432 | ||
1433 | /* Don't load any settings from .nspawn files */ | |
1434 | if (mask_all_settings) | |
1435 | arg_settings_mask = _SETTINGS_MASK_ALL; | |
1436 | ||
1437 | return 1; | |
1438 | } | |
1439 | ||
1440 | static int verify_arguments(void) { | |
1441 | int r; | |
1442 | ||
1443 | if (arg_userns_mode != USER_NAMESPACE_NO) | |
1444 | arg_mount_settings |= MOUNT_USE_USERNS; | |
1445 | ||
1446 | if (arg_private_network) | |
1447 | arg_mount_settings |= MOUNT_APPLY_APIVFS_NETNS; | |
1448 | ||
1449 | if (!(arg_clone_ns_flags & CLONE_NEWPID) || | |
1450 | !(arg_clone_ns_flags & CLONE_NEWUTS)) { | |
1451 | arg_register = false; | |
1452 | if (arg_start_mode != START_PID1) | |
1453 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--boot cannot be used without namespacing."); | |
1454 | } | |
1455 | ||
1456 | if (arg_userns_mode == USER_NAMESPACE_PICK) | |
1457 | arg_userns_chown = true; | |
1458 | ||
1459 | if (arg_start_mode == START_BOOT && arg_kill_signal <= 0) | |
1460 | arg_kill_signal = SIGRTMIN+3; | |
1461 | ||
1462 | 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 */ | |
1463 | arg_read_only = true; | |
1464 | ||
1465 | if (arg_keep_unit && arg_register && cg_pid_get_owner_uid(0, NULL) >= 0) | |
1466 | /* Save the user from accidentally registering either user-$SESSION.scope or user@.service. | |
1467 | * The latter is not technically a user session, but we don't need to labour the point. */ | |
1468 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--keep-unit --register=yes may not be used when invoked from a user session."); | |
1469 | ||
1470 | if (arg_directory && arg_image) | |
1471 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--directory= and --image= may not be combined."); | |
1472 | ||
1473 | if (arg_template && arg_image) | |
1474 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= and --image= may not be combined."); | |
1475 | ||
1476 | if (arg_template && !(arg_directory || arg_machine)) | |
1477 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--template= needs --directory= or --machine=."); | |
1478 | ||
1479 | if (arg_ephemeral && arg_template) | |
1480 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined."); | |
1481 | ||
1482 | if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) | |
1483 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined."); | |
1484 | ||
1485 | if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported()) | |
1486 | return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support."); | |
1487 | ||
1488 | if (arg_userns_chown && arg_read_only) | |
1489 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1490 | "--read-only and --private-users-chown may not be combined."); | |
1491 | ||
1492 | /* We don't support --private-users-chown together with any of the volatile modes since we couldn't | |
1493 | * change the read-only part of the tree (i.e. /usr) anyway, or because it would trigger a massive | |
1494 | * copy-up (in case of overlay) making the entire exercise pointless. */ | |
1495 | if (arg_userns_chown && arg_volatile_mode != VOLATILE_NO) | |
1496 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--volatile= and --private-users-chown may not be combined."); | |
1497 | ||
1498 | /* If --network-namespace-path is given with any other network-related option, we need to error out, | |
1499 | * to avoid conflicts between different network options. */ | |
1500 | if (arg_network_namespace_path && | |
1501 | (arg_network_interfaces || arg_network_macvlan || | |
1502 | arg_network_ipvlan || arg_network_veth_extra || | |
1503 | arg_network_bridge || arg_network_zone || | |
1504 | arg_network_veth || arg_private_network)) | |
1505 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--network-namespace-path= cannot be combined with other network options."); | |
1506 | ||
1507 | if (arg_network_bridge && arg_network_zone) | |
1508 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1509 | "--network-bridge= and --network-zone= may not be combined."); | |
1510 | ||
1511 | if (arg_userns_mode != USER_NAMESPACE_NO && (arg_mount_settings & MOUNT_APPLY_APIVFS_NETNS) && !arg_private_network) | |
1512 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid namespacing settings. Mounting sysfs with --private-users requires --private-network."); | |
1513 | ||
1514 | if (arg_userns_mode != USER_NAMESPACE_NO && !(arg_mount_settings & MOUNT_APPLY_APIVFS_RO)) | |
1515 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot combine --private-users with read-write mounts."); | |
1516 | ||
1517 | if (arg_expose_ports && !arg_private_network) | |
1518 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot use --port= without private networking."); | |
1519 | ||
1520 | #if ! HAVE_LIBIPTC | |
1521 | if (arg_expose_ports) | |
1522 | return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--port= is not supported, compiled without libiptc support."); | |
1523 | #endif | |
1524 | ||
1525 | r = custom_mount_check_all(); | |
1526 | if (r < 0) | |
1527 | return r; | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | static int userns_lchown(const char *p, uid_t uid, gid_t gid) { | |
1533 | assert(p); | |
1534 | ||
1535 | if (arg_userns_mode == USER_NAMESPACE_NO) | |
1536 | return 0; | |
1537 | ||
1538 | if (uid == UID_INVALID && gid == GID_INVALID) | |
1539 | return 0; | |
1540 | ||
1541 | if (uid != UID_INVALID) { | |
1542 | uid += arg_uid_shift; | |
1543 | ||
1544 | if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range) | |
1545 | return -EOVERFLOW; | |
1546 | } | |
1547 | ||
1548 | if (gid != GID_INVALID) { | |
1549 | gid += (gid_t) arg_uid_shift; | |
1550 | ||
1551 | if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range)) | |
1552 | return -EOVERFLOW; | |
1553 | } | |
1554 | ||
1555 | if (lchown(p, uid, gid) < 0) | |
1556 | return -errno; | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | static int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
1562 | const char *q; | |
1563 | int r; | |
1564 | ||
1565 | q = prefix_roota(root, path); | |
1566 | r = mkdir_errno_wrapper(q, mode); | |
1567 | if (r == -EEXIST) | |
1568 | return 0; | |
1569 | if (r < 0) | |
1570 | return r; | |
1571 | ||
1572 | return userns_lchown(q, uid, gid); | |
1573 | } | |
1574 | ||
1575 | static const char *timezone_from_path(const char *path) { | |
1576 | return PATH_STARTSWITH_SET( | |
1577 | path, | |
1578 | "../usr/share/zoneinfo/", | |
1579 | "/usr/share/zoneinfo/"); | |
1580 | } | |
1581 | ||
1582 | static bool etc_writable(void) { | |
1583 | return !arg_read_only || IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY); | |
1584 | } | |
1585 | ||
1586 | static int setup_timezone(const char *dest) { | |
1587 | _cleanup_free_ char *p = NULL, *etc = NULL; | |
1588 | const char *where, *check; | |
1589 | TimezoneMode m; | |
1590 | int r; | |
1591 | ||
1592 | assert(dest); | |
1593 | ||
1594 | if (IN_SET(arg_timezone, TIMEZONE_AUTO, TIMEZONE_SYMLINK)) { | |
1595 | r = readlink_malloc("/etc/localtime", &p); | |
1596 | if (r == -ENOENT && arg_timezone == TIMEZONE_AUTO) | |
1597 | m = etc_writable() ? TIMEZONE_DELETE : TIMEZONE_OFF; | |
1598 | else if (r == -EINVAL && arg_timezone == TIMEZONE_AUTO) /* regular file? */ | |
1599 | m = etc_writable() ? TIMEZONE_COPY : TIMEZONE_BIND; | |
1600 | else if (r < 0) { | |
1601 | log_warning_errno(r, "Failed to read host's /etc/localtime symlink, not updating container timezone: %m"); | |
1602 | /* To handle warning, delete /etc/localtime and replace it with a symbolic link to a time zone data | |
1603 | * file. | |
1604 | * | |
1605 | * Example: | |
1606 | * ln -s /usr/share/zoneinfo/UTC /etc/localtime | |
1607 | */ | |
1608 | return 0; | |
1609 | } else if (arg_timezone == TIMEZONE_AUTO) | |
1610 | m = etc_writable() ? TIMEZONE_SYMLINK : TIMEZONE_BIND; | |
1611 | else | |
1612 | m = arg_timezone; | |
1613 | } else | |
1614 | m = arg_timezone; | |
1615 | ||
1616 | if (m == TIMEZONE_OFF) | |
1617 | return 0; | |
1618 | ||
1619 | r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc); | |
1620 | if (r < 0) { | |
1621 | log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m"); | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | where = strjoina(etc, "/localtime"); | |
1626 | ||
1627 | switch (m) { | |
1628 | ||
1629 | case TIMEZONE_DELETE: | |
1630 | if (unlink(where) < 0) | |
1631 | log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where); | |
1632 | ||
1633 | return 0; | |
1634 | ||
1635 | case TIMEZONE_SYMLINK: { | |
1636 | _cleanup_free_ char *q = NULL; | |
1637 | const char *z, *what; | |
1638 | ||
1639 | z = timezone_from_path(p); | |
1640 | if (!z) { | |
1641 | log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone."); | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | r = readlink_malloc(where, &q); | |
1646 | if (r >= 0 && streq_ptr(timezone_from_path(q), z)) | |
1647 | return 0; /* Already pointing to the right place? Then do nothing .. */ | |
1648 | ||
1649 | check = strjoina(dest, "/usr/share/zoneinfo/", z); | |
1650 | r = chase_symlinks(check, dest, 0, NULL); | |
1651 | if (r < 0) | |
1652 | log_debug_errno(r, "Timezone %s does not exist (or is not accessible) in container, not creating symlink: %m", z); | |
1653 | else { | |
1654 | if (unlink(where) < 0 && errno != ENOENT) { | |
1655 | log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, /* Don't complain on read-only images */ | |
1656 | errno, "Failed to remove existing timezone info %s in container, ignoring: %m", where); | |
1657 | return 0; | |
1658 | } | |
1659 | ||
1660 | what = strjoina("../usr/share/zoneinfo/", z); | |
1661 | if (symlink(what, where) < 0) { | |
1662 | log_full_errno(IN_SET(errno, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING, | |
1663 | errno, "Failed to correct timezone of container, ignoring: %m"); | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | break; | |
1668 | } | |
1669 | ||
1670 | _fallthrough_; | |
1671 | } | |
1672 | ||
1673 | case TIMEZONE_BIND: { | |
1674 | _cleanup_free_ char *resolved = NULL; | |
1675 | int found; | |
1676 | ||
1677 | found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved); | |
1678 | if (found < 0) { | |
1679 | log_warning_errno(found, "Failed to resolve /etc/localtime path in container, ignoring: %m"); | |
1680 | return 0; | |
1681 | } | |
1682 | ||
1683 | if (found == 0) /* missing? */ | |
1684 | (void) touch(resolved); | |
1685 | ||
1686 | r = mount_verbose(LOG_WARNING, "/etc/localtime", resolved, NULL, MS_BIND, NULL); | |
1687 | if (r >= 0) | |
1688 | return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL); | |
1689 | ||
1690 | _fallthrough_; | |
1691 | } | |
1692 | ||
1693 | case TIMEZONE_COPY: | |
1694 | /* If mounting failed, try to copy */ | |
1695 | r = copy_file_atomic("/etc/localtime", where, 0644, 0, 0, COPY_REFLINK|COPY_REPLACE); | |
1696 | if (r < 0) { | |
1697 | log_full_errno(IN_SET(r, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r, | |
1698 | "Failed to copy /etc/localtime to %s, ignoring: %m", where); | |
1699 | return 0; | |
1700 | } | |
1701 | ||
1702 | break; | |
1703 | ||
1704 | default: | |
1705 | assert_not_reached("unexpected mode"); | |
1706 | } | |
1707 | ||
1708 | /* Fix permissions of the symlink or file copy we just created */ | |
1709 | r = userns_lchown(where, 0, 0); | |
1710 | if (r < 0) | |
1711 | log_warning_errno(r, "Failed to chown /etc/localtime, ignoring: %m"); | |
1712 | ||
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | static int have_resolv_conf(const char *path) { | |
1717 | assert(path); | |
1718 | ||
1719 | if (access(path, F_OK) < 0) { | |
1720 | if (errno == ENOENT) | |
1721 | return 0; | |
1722 | ||
1723 | return log_debug_errno(errno, "Failed to determine whether '%s' is available: %m", path); | |
1724 | } | |
1725 | ||
1726 | return 1; | |
1727 | } | |
1728 | ||
1729 | static int resolved_listening(void) { | |
1730 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
1731 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
1732 | _cleanup_free_ char *dns_stub_listener_mode = NULL; | |
1733 | int r; | |
1734 | ||
1735 | /* Check if resolved is listening */ | |
1736 | ||
1737 | r = sd_bus_open_system(&bus); | |
1738 | if (r < 0) | |
1739 | return log_debug_errno(r, "Failed to open system bus: %m"); | |
1740 | ||
1741 | r = bus_name_has_owner(bus, "org.freedesktop.resolve1", NULL); | |
1742 | if (r < 0) | |
1743 | return log_debug_errno(r, "Failed to check whether the 'org.freedesktop.resolve1' bus name is taken: %m"); | |
1744 | if (r == 0) | |
1745 | return 0; | |
1746 | ||
1747 | r = sd_bus_get_property_string(bus, | |
1748 | "org.freedesktop.resolve1", | |
1749 | "/org/freedesktop/resolve1", | |
1750 | "org.freedesktop.resolve1.Manager", | |
1751 | "DNSStubListener", | |
1752 | &error, | |
1753 | &dns_stub_listener_mode); | |
1754 | if (r < 0) | |
1755 | return log_debug_errno(r, "Failed to query DNSStubListener property: %s", bus_error_message(&error, r)); | |
1756 | ||
1757 | return STR_IN_SET(dns_stub_listener_mode, "udp", "yes"); | |
1758 | } | |
1759 | ||
1760 | static int setup_resolv_conf(const char *dest) { | |
1761 | _cleanup_free_ char *etc = NULL; | |
1762 | const char *where, *what; | |
1763 | ResolvConfMode m; | |
1764 | int r; | |
1765 | ||
1766 | assert(dest); | |
1767 | ||
1768 | if (arg_resolv_conf == RESOLV_CONF_AUTO) { | |
1769 | if (arg_private_network) | |
1770 | m = RESOLV_CONF_OFF; | |
1771 | else if (have_resolv_conf(STATIC_RESOLV_CONF) > 0 && resolved_listening() > 0) | |
1772 | m = etc_writable() ? RESOLV_CONF_COPY_STATIC : RESOLV_CONF_BIND_STATIC; | |
1773 | else if (have_resolv_conf("/etc/resolv.conf") > 0) | |
1774 | m = etc_writable() ? RESOLV_CONF_COPY_HOST : RESOLV_CONF_BIND_HOST; | |
1775 | else | |
1776 | m = etc_writable() ? RESOLV_CONF_DELETE : RESOLV_CONF_OFF; | |
1777 | } else | |
1778 | m = arg_resolv_conf; | |
1779 | ||
1780 | if (m == RESOLV_CONF_OFF) | |
1781 | return 0; | |
1782 | ||
1783 | r = chase_symlinks("/etc", dest, CHASE_PREFIX_ROOT, &etc); | |
1784 | if (r < 0) { | |
1785 | log_warning_errno(r, "Failed to resolve /etc path in container, ignoring: %m"); | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | where = strjoina(etc, "/resolv.conf"); | |
1790 | ||
1791 | if (m == RESOLV_CONF_DELETE) { | |
1792 | if (unlink(where) < 0) | |
1793 | log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to remove '%s', ignoring: %m", where); | |
1794 | ||
1795 | return 0; | |
1796 | } | |
1797 | ||
1798 | if (IN_SET(m, RESOLV_CONF_BIND_STATIC, RESOLV_CONF_COPY_STATIC)) | |
1799 | what = STATIC_RESOLV_CONF; | |
1800 | else | |
1801 | what = "/etc/resolv.conf"; | |
1802 | ||
1803 | if (IN_SET(m, RESOLV_CONF_BIND_HOST, RESOLV_CONF_BIND_STATIC)) { | |
1804 | _cleanup_free_ char *resolved = NULL; | |
1805 | int found; | |
1806 | ||
1807 | found = chase_symlinks(where, dest, CHASE_NONEXISTENT, &resolved); | |
1808 | if (found < 0) { | |
1809 | log_warning_errno(found, "Failed to resolve /etc/resolv.conf path in container, ignoring: %m"); | |
1810 | return 0; | |
1811 | } | |
1812 | ||
1813 | if (found == 0) /* missing? */ | |
1814 | (void) touch(resolved); | |
1815 | ||
1816 | r = mount_verbose(LOG_WARNING, what, resolved, NULL, MS_BIND, NULL); | |
1817 | if (r >= 0) | |
1818 | return mount_verbose(LOG_ERR, NULL, resolved, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL); | |
1819 | } | |
1820 | ||
1821 | /* If that didn't work, let's copy the file */ | |
1822 | r = copy_file(what, where, O_TRUNC|O_NOFOLLOW, 0644, 0, 0, COPY_REFLINK); | |
1823 | if (r < 0) { | |
1824 | /* If the file already exists as symlink, let's suppress the warning, under the assumption that | |
1825 | * resolved or something similar runs inside and the symlink points there. | |
1826 | * | |
1827 | * If the disk image is read-only, there's also no point in complaining. | |
1828 | */ | |
1829 | log_full_errno(!IN_SET(RESOLV_CONF_COPY_HOST, RESOLV_CONF_COPY_STATIC) && IN_SET(r, -ELOOP, -EROFS, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r, | |
1830 | "Failed to copy /etc/resolv.conf to %s, ignoring: %m", where); | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | r = userns_lchown(where, 0, 0); | |
1835 | if (r < 0) | |
1836 | log_warning_errno(r, "Failed to chown /etc/resolv.conf, ignoring: %m"); | |
1837 | ||
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | static int setup_boot_id(void) { | |
1842 | _cleanup_(unlink_and_freep) char *from = NULL; | |
1843 | _cleanup_free_ char *path = NULL; | |
1844 | sd_id128_t rnd = SD_ID128_NULL; | |
1845 | const char *to; | |
1846 | int r; | |
1847 | ||
1848 | /* Generate a new randomized boot ID, so that each boot-up of the container gets a new one */ | |
1849 | ||
1850 | r = tempfn_random_child("/run", "proc-sys-kernel-random-boot-id", &path); | |
1851 | if (r < 0) | |
1852 | return log_error_errno(r, "Failed to generate random boot ID path: %m"); | |
1853 | ||
1854 | r = sd_id128_randomize(&rnd); | |
1855 | if (r < 0) | |
1856 | return log_error_errno(r, "Failed to generate random boot id: %m"); | |
1857 | ||
1858 | r = id128_write(path, ID128_UUID, rnd, false); | |
1859 | if (r < 0) | |
1860 | return log_error_errno(r, "Failed to write boot id: %m"); | |
1861 | ||
1862 | from = TAKE_PTR(path); | |
1863 | to = "/proc/sys/kernel/random/boot_id"; | |
1864 | ||
1865 | r = mount_verbose(LOG_ERR, from, to, NULL, MS_BIND, NULL); | |
1866 | if (r < 0) | |
1867 | return r; | |
1868 | ||
1869 | return mount_verbose(LOG_ERR, NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL); | |
1870 | } | |
1871 | ||
1872 | static int copy_devnodes(const char *dest) { | |
1873 | static const char devnodes[] = | |
1874 | "null\0" | |
1875 | "zero\0" | |
1876 | "full\0" | |
1877 | "random\0" | |
1878 | "urandom\0" | |
1879 | "tty\0" | |
1880 | "net/tun\0"; | |
1881 | ||
1882 | _cleanup_umask_ mode_t u; | |
1883 | const char *d; | |
1884 | int r = 0; | |
1885 | ||
1886 | assert(dest); | |
1887 | ||
1888 | u = umask(0000); | |
1889 | ||
1890 | /* Create /dev/net, so that we can create /dev/net/tun in it */ | |
1891 | if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0) | |
1892 | return log_error_errno(r, "Failed to create /dev/net directory: %m"); | |
1893 | ||
1894 | NULSTR_FOREACH(d, devnodes) { | |
1895 | _cleanup_free_ char *from = NULL, *to = NULL; | |
1896 | struct stat st; | |
1897 | ||
1898 | from = strappend("/dev/", d); | |
1899 | if (!from) | |
1900 | return log_oom(); | |
1901 | ||
1902 | to = prefix_root(dest, from); | |
1903 | if (!to) | |
1904 | return log_oom(); | |
1905 | ||
1906 | if (stat(from, &st) < 0) { | |
1907 | ||
1908 | if (errno != ENOENT) | |
1909 | return log_error_errno(errno, "Failed to stat %s: %m", from); | |
1910 | ||
1911 | } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) | |
1912 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
1913 | "%s is not a char or block device, cannot copy.", from); | |
1914 | else { | |
1915 | _cleanup_free_ char *sl = NULL, *prefixed = NULL, *dn = NULL, *t = NULL; | |
1916 | ||
1917 | if (mknod(to, st.st_mode, st.st_rdev) < 0) { | |
1918 | /* Explicitly warn the user when /dev is already populated. */ | |
1919 | if (errno == EEXIST) | |
1920 | 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); | |
1921 | if (errno != EPERM) | |
1922 | return log_error_errno(errno, "mknod(%s) failed: %m", to); | |
1923 | ||
1924 | /* Some systems abusively restrict mknod but allow bind mounts. */ | |
1925 | r = touch(to); | |
1926 | if (r < 0) | |
1927 | return log_error_errno(r, "touch (%s) failed: %m", to); | |
1928 | r = mount_verbose(LOG_DEBUG, from, to, NULL, MS_BIND, NULL); | |
1929 | if (r < 0) | |
1930 | return log_error_errno(r, "Both mknod and bind mount (%s) failed: %m", to); | |
1931 | } | |
1932 | ||
1933 | r = userns_lchown(to, 0, 0); | |
1934 | if (r < 0) | |
1935 | return log_error_errno(r, "chown() of device node %s failed: %m", to); | |
1936 | ||
1937 | dn = path_join("/dev", S_ISCHR(st.st_mode) ? "char" : "block"); | |
1938 | if (!dn) | |
1939 | return log_oom(); | |
1940 | ||
1941 | r = userns_mkdir(dest, dn, 0755, 0, 0); | |
1942 | if (r < 0) | |
1943 | return log_error_errno(r, "Failed to create '%s': %m", dn); | |
1944 | ||
1945 | if (asprintf(&sl, "%s/%u:%u", dn, major(st.st_rdev), minor(st.st_rdev)) < 0) | |
1946 | return log_oom(); | |
1947 | ||
1948 | prefixed = prefix_root(dest, sl); | |
1949 | if (!prefixed) | |
1950 | return log_oom(); | |
1951 | ||
1952 | t = strjoin("../", d); | |
1953 | if (!t) | |
1954 | return log_oom(); | |
1955 | ||
1956 | if (symlink(t, prefixed) < 0) | |
1957 | log_debug_errno(errno, "Failed to symlink '%s' to '%s': %m", t, prefixed); | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | return r; | |
1962 | } | |
1963 | ||
1964 | static int make_extra_nodes(const char *dest) { | |
1965 | _cleanup_umask_ mode_t u; | |
1966 | size_t i; | |
1967 | int r; | |
1968 | ||
1969 | u = umask(0000); | |
1970 | ||
1971 | for (i = 0; i < arg_n_extra_nodes; i++) { | |
1972 | _cleanup_free_ char *path = NULL; | |
1973 | DeviceNode *n = arg_extra_nodes + i; | |
1974 | ||
1975 | path = prefix_root(dest, n->path); | |
1976 | if (!path) | |
1977 | return log_oom(); | |
1978 | ||
1979 | if (mknod(path, n->mode, S_ISCHR(n->mode) || S_ISBLK(n->mode) ? makedev(n->major, n->minor) : 0) < 0) | |
1980 | return log_error_errno(errno, "Failed to create device node '%s': %m", path); | |
1981 | ||
1982 | r = chmod_and_chown(path, n->mode, n->uid, n->gid); | |
1983 | if (r < 0) | |
1984 | return log_error_errno(r, "Failed to adjust device node ownership of '%s': %m", path); | |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
1990 | static int setup_pts(const char *dest) { | |
1991 | _cleanup_free_ char *options = NULL; | |
1992 | const char *p; | |
1993 | int r; | |
1994 | ||
1995 | #if HAVE_SELINUX | |
1996 | if (arg_selinux_apifs_context) | |
1997 | (void) asprintf(&options, | |
1998 | "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"", | |
1999 | arg_uid_shift + TTY_GID, | |
2000 | arg_selinux_apifs_context); | |
2001 | else | |
2002 | #endif | |
2003 | (void) asprintf(&options, | |
2004 | "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT, | |
2005 | arg_uid_shift + TTY_GID); | |
2006 | ||
2007 | if (!options) | |
2008 | return log_oom(); | |
2009 | ||
2010 | /* Mount /dev/pts itself */ | |
2011 | p = prefix_roota(dest, "/dev/pts"); | |
2012 | r = mkdir_errno_wrapper(p, 0755); | |
2013 | if (r < 0) | |
2014 | return log_error_errno(r, "Failed to create /dev/pts: %m"); | |
2015 | ||
2016 | r = mount_verbose(LOG_ERR, "devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options); | |
2017 | if (r < 0) | |
2018 | return r; | |
2019 | r = userns_lchown(p, 0, 0); | |
2020 | if (r < 0) | |
2021 | return log_error_errno(r, "Failed to chown /dev/pts: %m"); | |
2022 | ||
2023 | /* Create /dev/ptmx symlink */ | |
2024 | p = prefix_roota(dest, "/dev/ptmx"); | |
2025 | if (symlink("pts/ptmx", p) < 0) | |
2026 | return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m"); | |
2027 | r = userns_lchown(p, 0, 0); | |
2028 | if (r < 0) | |
2029 | return log_error_errno(r, "Failed to chown /dev/ptmx: %m"); | |
2030 | ||
2031 | /* And fix /dev/pts/ptmx ownership */ | |
2032 | p = prefix_roota(dest, "/dev/pts/ptmx"); | |
2033 | r = userns_lchown(p, 0, 0); | |
2034 | if (r < 0) | |
2035 | return log_error_errno(r, "Failed to chown /dev/pts/ptmx: %m"); | |
2036 | ||
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | static int setup_stdio_as_dev_console(void) { | |
2041 | int terminal; | |
2042 | int r; | |
2043 | ||
2044 | terminal = open_terminal("/dev/console", O_RDWR); | |
2045 | if (terminal < 0) | |
2046 | return log_error_errno(terminal, "Failed to open console: %m"); | |
2047 | ||
2048 | /* Make sure we can continue logging to the original stderr, even if | |
2049 | * stderr points elsewhere now */ | |
2050 | r = log_dup_console(); | |
2051 | if (r < 0) | |
2052 | return log_error_errno(r, "Failed to duplicate stderr: %m"); | |
2053 | ||
2054 | /* invalidates 'terminal' on success and failure */ | |
2055 | r = rearrange_stdio(terminal, terminal, terminal); | |
2056 | if (r < 0) | |
2057 | return log_error_errno(r, "Failed to move console to stdin/stdout/stderr: %m"); | |
2058 | ||
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | static int setup_dev_console(const char *console) { | |
2063 | _cleanup_free_ char *p = NULL; | |
2064 | int r; | |
2065 | ||
2066 | /* Create /dev/console symlink */ | |
2067 | r = path_make_relative("/dev", console, &p); | |
2068 | if (r < 0) | |
2069 | return log_error_errno(r, "Failed to create relative path: %m"); | |
2070 | ||
2071 | if (symlink(p, "/dev/console") < 0) | |
2072 | return log_error_errno(errno, "Failed to create /dev/console symlink: %m"); | |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | static int setup_keyring(void) { | |
2078 | key_serial_t keyring; | |
2079 | ||
2080 | /* Allocate a new session keyring for the container. This makes sure the keyring of the session systemd-nspawn | |
2081 | * was invoked from doesn't leak into the container. Note that by default we block keyctl() and request_key() | |
2082 | * anyway via seccomp so doing this operation isn't strictly necessary, but in case people explicitly whitelist | |
2083 | * these system calls let's make sure we don't leak anything into the container. */ | |
2084 | ||
2085 | keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0); | |
2086 | if (keyring == -1) { | |
2087 | if (errno == ENOSYS) | |
2088 | log_debug_errno(errno, "Kernel keyring not supported, ignoring."); | |
2089 | else if (IN_SET(errno, EACCES, EPERM)) | |
2090 | log_debug_errno(errno, "Kernel keyring access prohibited, ignoring."); | |
2091 | else | |
2092 | return log_error_errno(errno, "Setting up kernel keyring failed: %m"); | |
2093 | } | |
2094 | ||
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | static int setup_kmsg(int kmsg_socket) { | |
2099 | _cleanup_(unlink_and_freep) char *from = NULL; | |
2100 | _cleanup_free_ char *fifo = NULL; | |
2101 | _cleanup_close_ int fd = -1; | |
2102 | _cleanup_umask_ mode_t u; | |
2103 | int r; | |
2104 | ||
2105 | assert(kmsg_socket >= 0); | |
2106 | ||
2107 | u = umask(0000); | |
2108 | ||
2109 | /* We create the kmsg FIFO as as temporary file in /run, but immediately delete it after bind mounting it to | |
2110 | * /proc/kmsg. While FIFOs on the reading side behave very similar to /proc/kmsg, their writing side behaves | |
2111 | * differently from /dev/kmsg in that writing blocks when nothing is reading. In order to avoid any problems | |
2112 | * with containers deadlocking due to this we simply make /dev/kmsg unavailable to the container. */ | |
2113 | ||
2114 | r = tempfn_random_child("/run", "proc-kmsg", &fifo); | |
2115 | if (r < 0) | |
2116 | return log_error_errno(r, "Failed to generate kmsg path: %m"); | |
2117 | ||
2118 | if (mkfifo(fifo, 0600) < 0) | |
2119 | return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m"); | |
2120 | ||
2121 | from = TAKE_PTR(fifo); | |
2122 | ||
2123 | r = mount_verbose(LOG_ERR, from, "/proc/kmsg", NULL, MS_BIND, NULL); | |
2124 | if (r < 0) | |
2125 | return r; | |
2126 | ||
2127 | fd = open(from, O_RDWR|O_NONBLOCK|O_CLOEXEC); | |
2128 | if (fd < 0) | |
2129 | return log_error_errno(errno, "Failed to open fifo: %m"); | |
2130 | ||
2131 | /* Store away the fd in the socket, so that it stays open as long as we run the child */ | |
2132 | r = send_one_fd(kmsg_socket, fd, 0); | |
2133 | if (r < 0) | |
2134 | return log_error_errno(r, "Failed to send FIFO fd: %m"); | |
2135 | ||
2136 | return 0; | |
2137 | } | |
2138 | ||
2139 | static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { | |
2140 | union in_addr_union *exposed = userdata; | |
2141 | ||
2142 | assert(rtnl); | |
2143 | assert(m); | |
2144 | assert(exposed); | |
2145 | ||
2146 | expose_port_execute(rtnl, arg_expose_ports, exposed); | |
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | static int setup_hostname(void) { | |
2151 | int r; | |
2152 | ||
2153 | if ((arg_clone_ns_flags & CLONE_NEWUTS) == 0) | |
2154 | return 0; | |
2155 | ||
2156 | r = sethostname_idempotent(arg_hostname ?: arg_machine); | |
2157 | if (r < 0) | |
2158 | return log_error_errno(r, "Failed to set hostname: %m"); | |
2159 | ||
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | static int setup_journal(const char *directory) { | |
2164 | _cleanup_free_ char *d = NULL; | |
2165 | const char *dirname, *p, *q; | |
2166 | sd_id128_t this_id; | |
2167 | char id[33]; | |
2168 | bool try; | |
2169 | int r; | |
2170 | ||
2171 | /* Don't link journals in ephemeral mode */ | |
2172 | if (arg_ephemeral) | |
2173 | return 0; | |
2174 | ||
2175 | if (arg_link_journal == LINK_NO) | |
2176 | return 0; | |
2177 | ||
2178 | try = arg_link_journal_try || arg_link_journal == LINK_AUTO; | |
2179 | ||
2180 | r = sd_id128_get_machine(&this_id); | |
2181 | if (r < 0) | |
2182 | return log_error_errno(r, "Failed to retrieve machine ID: %m"); | |
2183 | ||
2184 | if (sd_id128_equal(arg_uuid, this_id)) { | |
2185 | log_full(try ? LOG_WARNING : LOG_ERR, | |
2186 | "Host and machine ids are equal (%s): refusing to link journals", sd_id128_to_string(arg_uuid, id)); | |
2187 | if (try) | |
2188 | return 0; | |
2189 | return -EEXIST; | |
2190 | } | |
2191 | ||
2192 | FOREACH_STRING(dirname, "/var", "/var/log", "/var/log/journal") { | |
2193 | r = userns_mkdir(directory, dirname, 0755, 0, 0); | |
2194 | if (r < 0) { | |
2195 | bool ignore = r == -EROFS && try; | |
2196 | log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r, | |
2197 | "Failed to create %s%s: %m", dirname, ignore ? ", ignoring" : ""); | |
2198 | return ignore ? 0 : r; | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | (void) sd_id128_to_string(arg_uuid, id); | |
2203 | ||
2204 | p = strjoina("/var/log/journal/", id); | |
2205 | q = prefix_roota(directory, p); | |
2206 | ||
2207 | if (path_is_mount_point(p, NULL, 0) > 0) { | |
2208 | if (try) | |
2209 | return 0; | |
2210 | ||
2211 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
2212 | "%s: already a mount point, refusing to use for journal", p); | |
2213 | } | |
2214 | ||
2215 | if (path_is_mount_point(q, NULL, 0) > 0) { | |
2216 | if (try) | |
2217 | return 0; | |
2218 | ||
2219 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
2220 | "%s: already a mount point, refusing to use for journal", q); | |
2221 | } | |
2222 | ||
2223 | r = readlink_and_make_absolute(p, &d); | |
2224 | if (r >= 0) { | |
2225 | if (IN_SET(arg_link_journal, LINK_GUEST, LINK_AUTO) && | |
2226 | path_equal(d, q)) { | |
2227 | ||
2228 | r = userns_mkdir(directory, p, 0755, 0, 0); | |
2229 | if (r < 0) | |
2230 | log_warning_errno(r, "Failed to create directory %s: %m", q); | |
2231 | return 0; | |
2232 | } | |
2233 | ||
2234 | if (unlink(p) < 0) | |
2235 | return log_error_errno(errno, "Failed to remove symlink %s: %m", p); | |
2236 | } else if (r == -EINVAL) { | |
2237 | ||
2238 | if (arg_link_journal == LINK_GUEST && | |
2239 | rmdir(p) < 0) { | |
2240 | ||
2241 | if (errno == ENOTDIR) { | |
2242 | log_error("%s already exists and is neither a symlink nor a directory", p); | |
2243 | return r; | |
2244 | } else | |
2245 | return log_error_errno(errno, "Failed to remove %s: %m", p); | |
2246 | } | |
2247 | } else if (r != -ENOENT) | |
2248 | return log_error_errno(r, "readlink(%s) failed: %m", p); | |
2249 | ||
2250 | if (arg_link_journal == LINK_GUEST) { | |
2251 | ||
2252 | if (symlink(q, p) < 0) { | |
2253 | if (try) { | |
2254 | log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p); | |
2255 | return 0; | |
2256 | } else | |
2257 | return log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p); | |
2258 | } | |
2259 | ||
2260 | r = userns_mkdir(directory, p, 0755, 0, 0); | |
2261 | if (r < 0) | |
2262 | log_warning_errno(r, "Failed to create directory %s: %m", q); | |
2263 | return 0; | |
2264 | } | |
2265 | ||
2266 | if (arg_link_journal == LINK_HOST) { | |
2267 | /* don't create parents here — if the host doesn't have | |
2268 | * permanent journal set up, don't force it here */ | |
2269 | ||
2270 | r = mkdir_errno_wrapper(p, 0755); | |
2271 | if (r < 0 && r != -EEXIST) { | |
2272 | if (try) { | |
2273 | log_debug_errno(r, "Failed to create %s, skipping journal setup: %m", p); | |
2274 | return 0; | |
2275 | } else | |
2276 | return log_error_errno(r, "Failed to create %s: %m", p); | |
2277 | } | |
2278 | ||
2279 | } else if (access(p, F_OK) < 0) | |
2280 | return 0; | |
2281 | ||
2282 | if (dir_is_empty(q) == 0) | |
2283 | log_warning("%s is not empty, proceeding anyway.", q); | |
2284 | ||
2285 | r = userns_mkdir(directory, p, 0755, 0, 0); | |
2286 | if (r < 0) | |
2287 | return log_error_errno(r, "Failed to create %s: %m", q); | |
2288 | ||
2289 | r = mount_verbose(LOG_DEBUG, p, q, NULL, MS_BIND, NULL); | |
2290 | if (r < 0) | |
2291 | return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m"); | |
2292 | ||
2293 | return 0; | |
2294 | } | |
2295 | ||
2296 | static int drop_capabilities(uid_t uid) { | |
2297 | CapabilityQuintet q; | |
2298 | ||
2299 | /* Let's initialize all five capability sets to something valid. If the quintet was configured via | |
2300 | * OCI use that, but fill in missing bits. If it wasn't then derive the quintet in full from | |
2301 | * arg_caps_retain. */ | |
2302 | ||
2303 | if (capability_quintet_is_set(&arg_full_capabilities)) { | |
2304 | q = arg_full_capabilities; | |
2305 | ||
2306 | if (q.bounding == (uint64_t) -1) | |
2307 | q.bounding = uid == 0 ? arg_caps_retain : 0; | |
2308 | ||
2309 | if (q.effective == (uint64_t) -1) | |
2310 | q.effective = uid == 0 ? q.bounding : 0; | |
2311 | ||
2312 | if (q.inheritable == (uint64_t) -1) | |
2313 | q.inheritable = uid == 0 ? q.bounding : 0; | |
2314 | ||
2315 | if (q.permitted == (uint64_t) -1) | |
2316 | q.permitted = uid == 0 ? q.bounding : 0; | |
2317 | ||
2318 | if (q.ambient == (uint64_t) -1 && ambient_capabilities_supported()) | |
2319 | q.ambient = 0; | |
2320 | } else | |
2321 | q = (CapabilityQuintet) { | |
2322 | .bounding = arg_caps_retain, | |
2323 | .effective = uid == 0 ? arg_caps_retain : 0, | |
2324 | .inheritable = uid == 0 ? arg_caps_retain : 0, | |
2325 | .permitted = uid == 0 ? arg_caps_retain : 0, | |
2326 | .ambient = ambient_capabilities_supported() ? 0 : (uint64_t) -1, | |
2327 | }; | |
2328 | ||
2329 | return capability_quintet_enforce(&q); | |
2330 | } | |
2331 | ||
2332 | static int reset_audit_loginuid(void) { | |
2333 | _cleanup_free_ char *p = NULL; | |
2334 | int r; | |
2335 | ||
2336 | if ((arg_clone_ns_flags & CLONE_NEWPID) == 0) | |
2337 | return 0; | |
2338 | ||
2339 | r = read_one_line_file("/proc/self/loginuid", &p); | |
2340 | if (r == -ENOENT) | |
2341 | return 0; | |
2342 | if (r < 0) | |
2343 | return log_error_errno(r, "Failed to read /proc/self/loginuid: %m"); | |
2344 | ||
2345 | /* Already reset? */ | |
2346 | if (streq(p, "4294967295")) | |
2347 | return 0; | |
2348 | ||
2349 | r = write_string_file("/proc/self/loginuid", "4294967295", WRITE_STRING_FILE_DISABLE_BUFFER); | |
2350 | if (r < 0) { | |
2351 | log_error_errno(r, | |
2352 | "Failed to reset audit login UID. This probably means that your kernel is too\n" | |
2353 | "old and you have audit enabled. Note that the auditing subsystem is known to\n" | |
2354 | "be incompatible with containers on old kernels. Please make sure to upgrade\n" | |
2355 | "your kernel or to off auditing with 'audit=0' on the kernel command line before\n" | |
2356 | "using systemd-nspawn. Sleeping for 5s... (%m)"); | |
2357 | ||
2358 | sleep(5); | |
2359 | } | |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
2364 | static int setup_propagate(const char *root) { | |
2365 | const char *p, *q; | |
2366 | int r; | |
2367 | ||
2368 | (void) mkdir_p("/run/systemd/nspawn/", 0755); | |
2369 | (void) mkdir_p("/run/systemd/nspawn/propagate", 0600); | |
2370 | p = strjoina("/run/systemd/nspawn/propagate/", arg_machine); | |
2371 | (void) mkdir_p(p, 0600); | |
2372 | ||
2373 | r = userns_mkdir(root, "/run/systemd", 0755, 0, 0); | |
2374 | if (r < 0) | |
2375 | return log_error_errno(r, "Failed to create /run/systemd: %m"); | |
2376 | ||
2377 | r = userns_mkdir(root, "/run/systemd/nspawn", 0755, 0, 0); | |
2378 | if (r < 0) | |
2379 | return log_error_errno(r, "Failed to create /run/systemd/nspawn: %m"); | |
2380 | ||
2381 | r = userns_mkdir(root, "/run/systemd/nspawn/incoming", 0600, 0, 0); | |
2382 | if (r < 0) | |
2383 | return log_error_errno(r, "Failed to create /run/systemd/nspawn/incoming: %m"); | |
2384 | ||
2385 | q = prefix_roota(root, "/run/systemd/nspawn/incoming"); | |
2386 | r = mount_verbose(LOG_ERR, p, q, NULL, MS_BIND, NULL); | |
2387 | if (r < 0) | |
2388 | return r; | |
2389 | ||
2390 | r = mount_verbose(LOG_ERR, NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL); | |
2391 | if (r < 0) | |
2392 | return r; | |
2393 | ||
2394 | /* machined will MS_MOVE into that directory, and that's only | |
2395 | * supported for non-shared mounts. */ | |
2396 | return mount_verbose(LOG_ERR, NULL, q, NULL, MS_SLAVE, NULL); | |
2397 | } | |
2398 | ||
2399 | static int setup_machine_id(const char *directory) { | |
2400 | const char *etc_machine_id; | |
2401 | sd_id128_t id; | |
2402 | int r; | |
2403 | ||
2404 | /* If the UUID in the container is already set, then that's what counts, and we use. If it isn't set, and the | |
2405 | * caller passed --uuid=, then we'll pass it in the $container_uuid env var to PID 1 of the container. The | |
2406 | * assumption is that PID 1 will then write it to /etc/machine-id to make it persistent. If --uuid= is not | |
2407 | * passed we generate a random UUID, and pass it via $container_uuid. In effect this means that /etc/machine-id | |
2408 | * in the container and our idea of the container UUID will always be in sync (at least if PID 1 in the | |
2409 | * container behaves nicely). */ | |
2410 | ||
2411 | etc_machine_id = prefix_roota(directory, "/etc/machine-id"); | |
2412 | ||
2413 | r = id128_read(etc_machine_id, ID128_PLAIN, &id); | |
2414 | if (r < 0) { | |
2415 | if (!IN_SET(r, -ENOENT, -ENOMEDIUM)) /* If the file is missing or empty, we don't mind */ | |
2416 | return log_error_errno(r, "Failed to read machine ID from container image: %m"); | |
2417 | ||
2418 | if (sd_id128_is_null(arg_uuid)) { | |
2419 | r = sd_id128_randomize(&arg_uuid); | |
2420 | if (r < 0) | |
2421 | return log_error_errno(r, "Failed to acquire randomized machine UUID: %m"); | |
2422 | } | |
2423 | } else { | |
2424 | if (sd_id128_is_null(id)) | |
2425 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
2426 | "Machine ID in container image is zero, refusing."); | |
2427 | ||
2428 | arg_uuid = id; | |
2429 | } | |
2430 | ||
2431 | return 0; | |
2432 | } | |
2433 | ||
2434 | static int recursive_chown(const char *directory, uid_t shift, uid_t range) { | |
2435 | int r; | |
2436 | ||
2437 | assert(directory); | |
2438 | ||
2439 | if (arg_userns_mode == USER_NAMESPACE_NO || !arg_userns_chown) | |
2440 | return 0; | |
2441 | ||
2442 | r = path_patch_uid(directory, arg_uid_shift, arg_uid_range); | |
2443 | if (r == -EOPNOTSUPP) | |
2444 | 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."); | |
2445 | if (r == -EBADE) | |
2446 | return log_error_errno(r, "Upper 16 bits of root directory UID and GID do not match."); | |
2447 | if (r < 0) | |
2448 | return log_error_errno(r, "Failed to adjust UID/GID shift of OS tree: %m"); | |
2449 | if (r == 0) | |
2450 | log_debug("Root directory of image is already owned by the right UID/GID range, skipping recursive chown operation."); | |
2451 | else | |
2452 | log_debug("Patched directory tree to match UID/GID range."); | |
2453 | ||
2454 | return r; | |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * Return values: | |
2459 | * < 0 : wait_for_terminate() failed to get the state of the | |
2460 | * container, the container was terminated by a signal, or | |
2461 | * failed for an unknown reason. No change is made to the | |
2462 | * container argument. | |
2463 | * > 0 : The program executed in the container terminated with an | |
2464 | * error. The exit code of the program executed in the | |
2465 | * container is returned. The container argument has been set | |
2466 | * to CONTAINER_TERMINATED. | |
2467 | * 0 : The container is being rebooted, has been shut down or exited | |
2468 | * successfully. The container argument has been set to either | |
2469 | * CONTAINER_TERMINATED or CONTAINER_REBOOTED. | |
2470 | * | |
2471 | * That is, success is indicated by a return value of zero, and an | |
2472 | * error is indicated by a non-zero value. | |
2473 | */ | |
2474 | static int wait_for_container(pid_t pid, ContainerStatus *container) { | |
2475 | siginfo_t status; | |
2476 | int r; | |
2477 | ||
2478 | r = wait_for_terminate(pid, &status); | |
2479 | if (r < 0) | |
2480 | return log_warning_errno(r, "Failed to wait for container: %m"); | |
2481 | ||
2482 | switch (status.si_code) { | |
2483 | ||
2484 | case CLD_EXITED: | |
2485 | if (status.si_status == 0) | |
2486 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine); | |
2487 | else | |
2488 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status); | |
2489 | ||
2490 | *container = CONTAINER_TERMINATED; | |
2491 | return status.si_status; | |
2492 | ||
2493 | case CLD_KILLED: | |
2494 | if (status.si_status == SIGINT) { | |
2495 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine); | |
2496 | *container = CONTAINER_TERMINATED; | |
2497 | return 0; | |
2498 | ||
2499 | } else if (status.si_status == SIGHUP) { | |
2500 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine); | |
2501 | *container = CONTAINER_REBOOTED; | |
2502 | return 0; | |
2503 | } | |
2504 | ||
2505 | _fallthrough_; | |
2506 | case CLD_DUMPED: | |
2507 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
2508 | "Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status)); | |
2509 | ||
2510 | default: | |
2511 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
2512 | "Container %s failed due to unknown reason.", arg_machine); | |
2513 | } | |
2514 | } | |
2515 | ||
2516 | static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
2517 | pid_t pid; | |
2518 | ||
2519 | pid = PTR_TO_PID(userdata); | |
2520 | if (pid > 0) { | |
2521 | if (kill(pid, arg_kill_signal) >= 0) { | |
2522 | log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination."); | |
2523 | sd_event_source_set_userdata(s, NULL); | |
2524 | return 0; | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | sd_event_exit(sd_event_source_get_event(s), 0); | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *ssi, void *userdata) { | |
2533 | pid_t pid; | |
2534 | ||
2535 | assert(s); | |
2536 | assert(ssi); | |
2537 | ||
2538 | pid = PTR_TO_PID(userdata); | |
2539 | ||
2540 | for (;;) { | |
2541 | siginfo_t si = {}; | |
2542 | ||
2543 | if (waitid(P_ALL, 0, &si, WNOHANG|WNOWAIT|WEXITED) < 0) | |
2544 | return log_error_errno(errno, "Failed to waitid(): %m"); | |
2545 | if (si.si_pid == 0) /* No pending children. */ | |
2546 | break; | |
2547 | if (si.si_pid == pid) { | |
2548 | /* The main process we care for has exited. Return from | |
2549 | * signal handler but leave the zombie. */ | |
2550 | sd_event_exit(sd_event_source_get_event(s), 0); | |
2551 | break; | |
2552 | } | |
2553 | ||
2554 | /* Reap all other children. */ | |
2555 | (void) waitid(P_PID, si.si_pid, &si, WNOHANG|WEXITED); | |
2556 | } | |
2557 | ||
2558 | return 0; | |
2559 | } | |
2560 | ||
2561 | static int on_request_stop(sd_bus_message *m, void *userdata, sd_bus_error *error) { | |
2562 | pid_t pid; | |
2563 | ||
2564 | assert(m); | |
2565 | ||
2566 | pid = PTR_TO_PID(userdata); | |
2567 | ||
2568 | if (arg_kill_signal > 0) { | |
2569 | log_info("Container termination requested. Attempting to halt container."); | |
2570 | (void) kill(pid, arg_kill_signal); | |
2571 | } else { | |
2572 | log_info("Container termination requested. Exiting."); | |
2573 | sd_event_exit(sd_bus_get_event(sd_bus_message_get_bus(m)), 0); | |
2574 | } | |
2575 | ||
2576 | return 0; | |
2577 | } | |
2578 | ||
2579 | static int determine_names(void) { | |
2580 | int r; | |
2581 | ||
2582 | if (arg_template && !arg_directory && arg_machine) { | |
2583 | ||
2584 | /* If --template= was specified then we should not | |
2585 | * search for a machine, but instead create a new one | |
2586 | * in /var/lib/machine. */ | |
2587 | ||
2588 | arg_directory = path_join("/var/lib/machines", arg_machine); | |
2589 | if (!arg_directory) | |
2590 | return log_oom(); | |
2591 | } | |
2592 | ||
2593 | if (!arg_image && !arg_directory) { | |
2594 | if (arg_machine) { | |
2595 | _cleanup_(image_unrefp) Image *i = NULL; | |
2596 | ||
2597 | r = image_find(IMAGE_MACHINE, arg_machine, &i); | |
2598 | if (r == -ENOENT) | |
2599 | return log_error_errno(r, "No image for machine '%s'.", arg_machine); | |
2600 | if (r < 0) | |
2601 | return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine); | |
2602 | ||
2603 | if (IN_SET(i->type, IMAGE_RAW, IMAGE_BLOCK)) | |
2604 | r = free_and_strdup(&arg_image, i->path); | |
2605 | else | |
2606 | r = free_and_strdup(&arg_directory, i->path); | |
2607 | if (r < 0) | |
2608 | return log_oom(); | |
2609 | ||
2610 | if (!arg_ephemeral) | |
2611 | arg_read_only = arg_read_only || i->read_only; | |
2612 | } else { | |
2613 | r = safe_getcwd(&arg_directory); | |
2614 | if (r < 0) | |
2615 | return log_error_errno(r, "Failed to determine current directory: %m"); | |
2616 | } | |
2617 | ||
2618 | if (!arg_directory && !arg_image) | |
2619 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine path, please use -D or -i."); | |
2620 | } | |
2621 | ||
2622 | if (!arg_machine) { | |
2623 | if (arg_directory && path_equal(arg_directory, "/")) | |
2624 | arg_machine = gethostname_malloc(); | |
2625 | else { | |
2626 | if (arg_image) { | |
2627 | char *e; | |
2628 | ||
2629 | arg_machine = strdup(basename(arg_image)); | |
2630 | ||
2631 | /* Truncate suffix if there is one */ | |
2632 | e = endswith(arg_machine, ".raw"); | |
2633 | if (e) | |
2634 | *e = 0; | |
2635 | } else | |
2636 | arg_machine = strdup(basename(arg_directory)); | |
2637 | } | |
2638 | if (!arg_machine) | |
2639 | return log_oom(); | |
2640 | ||
2641 | hostname_cleanup(arg_machine); | |
2642 | if (!machine_name_is_valid(arg_machine)) | |
2643 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to determine machine name automatically, please use -M."); | |
2644 | ||
2645 | if (arg_ephemeral) { | |
2646 | char *b; | |
2647 | ||
2648 | /* Add a random suffix when this is an | |
2649 | * ephemeral machine, so that we can run many | |
2650 | * instances at once without manually having | |
2651 | * to specify -M each time. */ | |
2652 | ||
2653 | if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0) | |
2654 | return log_oom(); | |
2655 | ||
2656 | free(arg_machine); | |
2657 | arg_machine = b; | |
2658 | } | |
2659 | } | |
2660 | ||
2661 | return 0; | |
2662 | } | |
2663 | ||
2664 | static int chase_symlinks_and_update(char **p, unsigned flags) { | |
2665 | char *chased; | |
2666 | int r; | |
2667 | ||
2668 | assert(p); | |
2669 | ||
2670 | if (!*p) | |
2671 | return 0; | |
2672 | ||
2673 | r = chase_symlinks(*p, NULL, flags, &chased); | |
2674 | if (r < 0) | |
2675 | return log_error_errno(r, "Failed to resolve path %s: %m", *p); | |
2676 | ||
2677 | free_and_replace(*p, chased); | |
2678 | return r; /* r might be an fd here in case we ever use CHASE_OPEN in flags */ | |
2679 | } | |
2680 | ||
2681 | static int determine_uid_shift(const char *directory) { | |
2682 | int r; | |
2683 | ||
2684 | if (arg_userns_mode == USER_NAMESPACE_NO) { | |
2685 | arg_uid_shift = 0; | |
2686 | return 0; | |
2687 | } | |
2688 | ||
2689 | if (arg_uid_shift == UID_INVALID) { | |
2690 | struct stat st; | |
2691 | ||
2692 | r = stat(directory, &st); | |
2693 | if (r < 0) | |
2694 | return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory); | |
2695 | ||
2696 | arg_uid_shift = st.st_uid & UINT32_C(0xffff0000); | |
2697 | ||
2698 | if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000))) | |
2699 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
2700 | "UID and GID base of %s don't match.", directory); | |
2701 | ||
2702 | arg_uid_range = UINT32_C(0x10000); | |
2703 | } | |
2704 | ||
2705 | if (arg_uid_shift > (uid_t) -1 - arg_uid_range) | |
2706 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
2707 | "UID base too high for UID range."); | |
2708 | ||
2709 | return 0; | |
2710 | } | |
2711 | ||
2712 | static unsigned long effective_clone_ns_flags(void) { | |
2713 | unsigned long flags = arg_clone_ns_flags; | |
2714 | ||
2715 | if (arg_private_network) | |
2716 | flags |= CLONE_NEWNET; | |
2717 | if (arg_use_cgns) | |
2718 | flags |= CLONE_NEWCGROUP; | |
2719 | if (arg_userns_mode != USER_NAMESPACE_NO) | |
2720 | flags |= CLONE_NEWUSER; | |
2721 | ||
2722 | return flags; | |
2723 | } | |
2724 | ||
2725 | static int patch_sysctl(void) { | |
2726 | ||
2727 | /* This table is inspired by runc's sysctl() function */ | |
2728 | static const struct { | |
2729 | const char *key; | |
2730 | bool prefix; | |
2731 | unsigned long clone_flags; | |
2732 | } safe_sysctl[] = { | |
2733 | { "kernel.hostname", false, CLONE_NEWUTS }, | |
2734 | { "kernel.domainname", false, CLONE_NEWUTS }, | |
2735 | { "kernel.msgmax", false, CLONE_NEWIPC }, | |
2736 | { "kernel.msgmnb", false, CLONE_NEWIPC }, | |
2737 | { "kernel.msgmni", false, CLONE_NEWIPC }, | |
2738 | { "kernel.sem", false, CLONE_NEWIPC }, | |
2739 | { "kernel.shmall", false, CLONE_NEWIPC }, | |
2740 | { "kernel.shmmax", false, CLONE_NEWIPC }, | |
2741 | { "kernel.shmmni", false, CLONE_NEWIPC }, | |
2742 | { "fs.mqueue.", true, CLONE_NEWIPC }, | |
2743 | { "net.", true, CLONE_NEWNET }, | |
2744 | }; | |
2745 | ||
2746 | unsigned long flags; | |
2747 | char **k, **v; | |
2748 | int r; | |
2749 | ||
2750 | flags = effective_clone_ns_flags(); | |
2751 | ||
2752 | STRV_FOREACH_PAIR(k, v, arg_sysctl) { | |
2753 | bool good = false; | |
2754 | size_t i; | |
2755 | ||
2756 | for (i = 0; i < ELEMENTSOF(safe_sysctl); i++) { | |
2757 | ||
2758 | if (!FLAGS_SET(flags, safe_sysctl[i].clone_flags)) | |
2759 | continue; | |
2760 | ||
2761 | if (safe_sysctl[i].prefix) | |
2762 | good = startswith(*k, safe_sysctl[i].key); | |
2763 | else | |
2764 | good = streq(*k, safe_sysctl[i].key); | |
2765 | ||
2766 | if (good) | |
2767 | break; | |
2768 | } | |
2769 | ||
2770 | if (!good) | |
2771 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to write to sysctl '%s', as it is not safe in the selected namespaces.", *k); | |
2772 | ||
2773 | r = sysctl_write(*k, *v); | |
2774 | if (r < 0) | |
2775 | return log_error_errno(r, "Failed to write sysctl '%s': %m", *k); | |
2776 | } | |
2777 | ||
2778 | return 0; | |
2779 | } | |
2780 | ||
2781 | static int inner_child( | |
2782 | Barrier *barrier, | |
2783 | const char *directory, | |
2784 | bool secondary, | |
2785 | int kmsg_socket, | |
2786 | int rtnl_socket, | |
2787 | int master_pty_socket, | |
2788 | FDSet *fds) { | |
2789 | ||
2790 | _cleanup_close_ int master = -1; | |
2791 | _cleanup_free_ char *home = NULL; | |
2792 | char as_uuid[37]; | |
2793 | size_t n_env = 1; | |
2794 | const char *envp[] = { | |
2795 | "PATH=" DEFAULT_PATH_COMPAT, | |
2796 | NULL, /* container */ | |
2797 | NULL, /* TERM */ | |
2798 | NULL, /* HOME */ | |
2799 | NULL, /* USER */ | |
2800 | NULL, /* LOGNAME */ | |
2801 | NULL, /* container_uuid */ | |
2802 | NULL, /* LISTEN_FDS */ | |
2803 | NULL, /* LISTEN_PID */ | |
2804 | NULL, /* NOTIFY_SOCKET */ | |
2805 | NULL | |
2806 | }; | |
2807 | const char *exec_target; | |
2808 | _cleanup_strv_free_ char **env_use = NULL; | |
2809 | int r, which_failed; | |
2810 | ||
2811 | /* This is the "inner" child process, i.e. the one forked off by the "outer" child process, which is the one | |
2812 | * the container manager itself forked off. At the time of clone() it gained its own CLONE_NEWNS, CLONE_NEWPID, | |
2813 | * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER namespaces. Note that it has its own CLONE_NEWNS namespace, | |
2814 | * separate from the CLONE_NEWNS created for the "outer" child, and also separate from the host's CLONE_NEWNS | |
2815 | * namespace. The reason for having two levels of CLONE_NEWNS namespaces is that the "inner" one is owned by | |
2816 | * the CLONE_NEWUSER namespace of the container, while the "outer" one is owned by the host's CLONE_NEWUSER | |
2817 | * namespace. | |
2818 | * | |
2819 | * Note at this point we have no CLONE_NEWNET namespace yet. We'll acquire that one later through | |
2820 | * unshare(). See below. */ | |
2821 | ||
2822 | assert(barrier); | |
2823 | assert(directory); | |
2824 | assert(kmsg_socket >= 0); | |
2825 | ||
2826 | log_debug("Inner child is initializing."); | |
2827 | ||
2828 | if (arg_userns_mode != USER_NAMESPACE_NO) { | |
2829 | /* Tell the parent, that it now can write the UID map. */ | |
2830 | (void) barrier_place(barrier); /* #1 */ | |
2831 | ||
2832 | /* Wait until the parent wrote the UID map */ | |
2833 | if (!barrier_place_and_sync(barrier)) /* #2 */ | |
2834 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), | |
2835 | "Parent died too early"); | |
2836 | } | |
2837 | ||
2838 | r = reset_uid_gid(); | |
2839 | if (r < 0) | |
2840 | return log_error_errno(r, "Couldn't become new root: %m"); | |
2841 | ||
2842 | r = mount_all(NULL, | |
2843 | arg_mount_settings | MOUNT_IN_USERNS, | |
2844 | arg_uid_shift, | |
2845 | arg_selinux_apifs_context); | |
2846 | if (r < 0) | |
2847 | return r; | |
2848 | ||
2849 | if (!arg_network_namespace_path && arg_private_network) { | |
2850 | r = unshare(CLONE_NEWNET); | |
2851 | if (r < 0) | |
2852 | return log_error_errno(errno, "Failed to unshare network namespace: %m"); | |
2853 | ||
2854 | /* Tell the parent that it can setup network interfaces. */ | |
2855 | (void) barrier_place(barrier); /* #3 */ | |
2856 | } | |
2857 | ||
2858 | r = mount_sysfs(NULL, arg_mount_settings); | |
2859 | if (r < 0) | |
2860 | return r; | |
2861 | ||
2862 | /* Wait until we are cgroup-ified, so that we | |
2863 | * can mount the right cgroup path writable */ | |
2864 | if (!barrier_place_and_sync(barrier)) /* #4 */ | |
2865 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), | |
2866 | "Parent died too early"); | |
2867 | ||
2868 | if (arg_use_cgns) { | |
2869 | r = unshare(CLONE_NEWCGROUP); | |
2870 | if (r < 0) | |
2871 | return log_error_errno(errno, "Failed to unshare cgroup namespace: %m"); | |
2872 | r = mount_cgroups( | |
2873 | "", | |
2874 | arg_unified_cgroup_hierarchy, | |
2875 | arg_userns_mode != USER_NAMESPACE_NO, | |
2876 | arg_uid_shift, | |
2877 | arg_uid_range, | |
2878 | arg_selinux_apifs_context, | |
2879 | true); | |
2880 | if (r < 0) | |
2881 | return r; | |
2882 | } else { | |
2883 | r = mount_systemd_cgroup_writable("", arg_unified_cgroup_hierarchy); | |
2884 | if (r < 0) | |
2885 | return r; | |
2886 | } | |
2887 | ||
2888 | r = setup_boot_id(); | |
2889 | if (r < 0) | |
2890 | return r; | |
2891 | ||
2892 | r = setup_kmsg(kmsg_socket); | |
2893 | if (r < 0) | |
2894 | return r; | |
2895 | kmsg_socket = safe_close(kmsg_socket); | |
2896 | ||
2897 | r = mount_custom( | |
2898 | "/", | |
2899 | arg_custom_mounts, | |
2900 | arg_n_custom_mounts, | |
2901 | false, | |
2902 | 0, | |
2903 | 0, | |
2904 | arg_selinux_apifs_context, | |
2905 | true); | |
2906 | if (r < 0) | |
2907 | return r; | |
2908 | ||
2909 | if (setsid() < 0) | |
2910 | return log_error_errno(errno, "setsid() failed: %m"); | |
2911 | ||
2912 | if (arg_private_network) | |
2913 | loopback_setup(); | |
2914 | ||
2915 | if (arg_expose_ports) { | |
2916 | r = expose_port_send_rtnl(rtnl_socket); | |
2917 | if (r < 0) | |
2918 | return r; | |
2919 | rtnl_socket = safe_close(rtnl_socket); | |
2920 | } | |
2921 | ||
2922 | if (arg_console_mode != CONSOLE_PIPE) { | |
2923 | _cleanup_free_ char *console = NULL; | |
2924 | ||
2925 | /* Allocate a pty and make it available as /dev/console. */ | |
2926 | master = openpt_allocate(O_RDWR|O_NONBLOCK, &console); | |
2927 | if (master < 0) | |
2928 | return log_error_errno(master, "Failed to allocate a pty: %m"); | |
2929 | ||
2930 | r = setup_dev_console(console); | |
2931 | if (r < 0) | |
2932 | return log_error_errno(r, "Failed to setup /dev/console: %m"); | |
2933 | ||
2934 | r = send_one_fd(master_pty_socket, master, 0); | |
2935 | if (r < 0) | |
2936 | return log_error_errno(r, "Failed to send master fd: %m"); | |
2937 | master_pty_socket = safe_close(master_pty_socket); | |
2938 | ||
2939 | r = setup_stdio_as_dev_console(); | |
2940 | if (r < 0) | |
2941 | return r; | |
2942 | } | |
2943 | ||
2944 | r = patch_sysctl(); | |
2945 | if (r < 0) | |
2946 | return r; | |
2947 | ||
2948 | if (arg_oom_score_adjust_set) { | |
2949 | r = set_oom_score_adjust(arg_oom_score_adjust); | |
2950 | if (r < 0) | |
2951 | return log_error_errno(r, "Failed to adjust OOM score: %m"); | |
2952 | } | |
2953 | ||
2954 | if (arg_cpu_set.set) | |
2955 | if (sched_setaffinity(0, arg_cpu_set.allocated, arg_cpu_set.set) < 0) | |
2956 | return log_error_errno(errno, "Failed to set CPU affinity: %m"); | |
2957 | ||
2958 | (void) setup_hostname(); | |
2959 | ||
2960 | if (arg_personality != PERSONALITY_INVALID) { | |
2961 | r = safe_personality(arg_personality); | |
2962 | if (r < 0) | |
2963 | return log_error_errno(r, "personality() failed: %m"); | |
2964 | } else if (secondary) { | |
2965 | r = safe_personality(PER_LINUX32); | |
2966 | if (r < 0) | |
2967 | return log_error_errno(r, "personality() failed: %m"); | |
2968 | } | |
2969 | ||
2970 | r = setrlimit_closest_all((const struct rlimit *const*) arg_rlimit, &which_failed); | |
2971 | if (r < 0) | |
2972 | return log_error_errno(r, "Failed to apply resource limit RLIMIT_%s: %m", rlimit_to_string(which_failed)); | |
2973 | ||
2974 | #if HAVE_SECCOMP | |
2975 | if (arg_seccomp) { | |
2976 | ||
2977 | if (is_seccomp_available()) { | |
2978 | ||
2979 | r = seccomp_load(arg_seccomp); | |
2980 | if (ERRNO_IS_SECCOMP_FATAL(r)) | |
2981 | return log_error_errno(r, "Failed to install seccomp filter: %m"); | |
2982 | if (r < 0) | |
2983 | log_debug_errno(r, "Failed to install seccomp filter: %m"); | |
2984 | } | |
2985 | } else | |
2986 | #endif | |
2987 | { | |
2988 | r = setup_seccomp(arg_caps_retain, arg_syscall_whitelist, arg_syscall_blacklist); | |
2989 | if (r < 0) | |
2990 | return r; | |
2991 | } | |
2992 | ||
2993 | #if HAVE_SELINUX | |
2994 | if (arg_selinux_context) | |
2995 | if (setexeccon(arg_selinux_context) < 0) | |
2996 | return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context); | |
2997 | #endif | |
2998 | ||
2999 | /* Make sure we keep the caps across the uid/gid dropping, so that we can retain some selected caps | |
3000 | * if we need to later on. */ | |
3001 | if (prctl(PR_SET_KEEPCAPS, 1) < 0) | |
3002 | return log_error_errno(errno, "Failed to set PR_SET_KEEPCAPS: %m"); | |
3003 | ||
3004 | if (uid_is_valid(arg_uid) || gid_is_valid(arg_gid)) | |
3005 | r = change_uid_gid_raw(arg_uid, arg_gid, arg_supplementary_gids, arg_n_supplementary_gids); | |
3006 | else | |
3007 | r = change_uid_gid(arg_user, &home); | |
3008 | if (r < 0) | |
3009 | return r; | |
3010 | ||
3011 | r = drop_capabilities(getuid()); | |
3012 | if (r < 0) | |
3013 | return log_error_errno(r, "Dropping capabilities failed: %m"); | |
3014 | ||
3015 | if (arg_no_new_privileges) | |
3016 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) | |
3017 | return log_error_errno(errno, "Failed to disable new privileges: %m"); | |
3018 | ||
3019 | /* LXC sets container=lxc, so follow the scheme here */ | |
3020 | envp[n_env++] = strjoina("container=", arg_container_service_name); | |
3021 | ||
3022 | envp[n_env] = strv_find_prefix(environ, "TERM="); | |
3023 | if (envp[n_env]) | |
3024 | n_env++; | |
3025 | ||
3026 | if (home || !uid_is_valid(arg_uid) || arg_uid == 0) | |
3027 | if (asprintf((char**)(envp + n_env++), "HOME=%s", home ?: "/root") < 0) | |
3028 | return log_oom(); | |
3029 | ||
3030 | if (arg_user || !uid_is_valid(arg_uid) || arg_uid == 0) | |
3031 | if (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ?: "root") < 0 || | |
3032 | asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0) | |
3033 | return log_oom(); | |
3034 | ||
3035 | assert(!sd_id128_is_null(arg_uuid)); | |
3036 | ||
3037 | if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_to_uuid_string(arg_uuid, as_uuid)) < 0) | |
3038 | return log_oom(); | |
3039 | ||
3040 | if (fdset_size(fds) > 0) { | |
3041 | r = fdset_cloexec(fds, false); | |
3042 | if (r < 0) | |
3043 | return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors."); | |
3044 | ||
3045 | if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", fdset_size(fds)) < 0) || | |
3046 | (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) | |
3047 | return log_oom(); | |
3048 | } | |
3049 | if (asprintf((char **)(envp + n_env++), "NOTIFY_SOCKET=%s", NSPAWN_NOTIFY_SOCKET_PATH) < 0) | |
3050 | return log_oom(); | |
3051 | ||
3052 | env_use = strv_env_merge(2, envp, arg_setenv); | |
3053 | if (!env_use) | |
3054 | return log_oom(); | |
3055 | ||
3056 | /* Let the parent know that we are ready and | |
3057 | * wait until the parent is ready with the | |
3058 | * setup, too... */ | |
3059 | if (!barrier_place_and_sync(barrier)) /* #5 */ | |
3060 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), | |
3061 | "Parent died too early"); | |
3062 | ||
3063 | if (arg_chdir) | |
3064 | if (chdir(arg_chdir) < 0) | |
3065 | return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir); | |
3066 | ||
3067 | if (arg_start_mode == START_PID2) { | |
3068 | r = stub_pid1(arg_uuid); | |
3069 | if (r < 0) | |
3070 | return r; | |
3071 | } | |
3072 | ||
3073 | log_debug("Inner child completed, invoking payload."); | |
3074 | ||
3075 | /* Now, explicitly close the log, so that we then can close all remaining fds. Closing the log explicitly first | |
3076 | * has the benefit that the logging subsystem knows about it, and is thus ready to be reopened should we need | |
3077 | * it again. Note that the other fds closed here are at least the locking and barrier fds. */ | |
3078 | log_close(); | |
3079 | log_set_open_when_needed(true); | |
3080 | ||
3081 | (void) fdset_close_others(fds); | |
3082 | ||
3083 | if (arg_start_mode == START_BOOT) { | |
3084 | char **a; | |
3085 | size_t m; | |
3086 | ||
3087 | /* Automatically search for the init system */ | |
3088 | ||
3089 | m = strv_length(arg_parameters); | |
3090 | a = newa(char*, m + 2); | |
3091 | memcpy_safe(a + 1, arg_parameters, m * sizeof(char*)); | |
3092 | a[1 + m] = NULL; | |
3093 | ||
3094 | a[0] = (char*) "/usr/lib/systemd/systemd"; | |
3095 | execve(a[0], a, env_use); | |
3096 | ||
3097 | a[0] = (char*) "/lib/systemd/systemd"; | |
3098 | execve(a[0], a, env_use); | |
3099 | ||
3100 | a[0] = (char*) "/sbin/init"; | |
3101 | execve(a[0], a, env_use); | |
3102 | ||
3103 | exec_target = "/usr/lib/systemd/systemd, /lib/systemd/systemd, /sbin/init"; | |
3104 | } else if (!strv_isempty(arg_parameters)) { | |
3105 | const char *dollar_path; | |
3106 | ||
3107 | exec_target = arg_parameters[0]; | |
3108 | ||
3109 | /* Use the user supplied search $PATH if there is one, or DEFAULT_PATH_COMPAT if not to search the | |
3110 | * binary. */ | |
3111 | dollar_path = strv_env_get(env_use, "PATH"); | |
3112 | if (dollar_path) { | |
3113 | if (putenv((char*) dollar_path) != 0) | |
3114 | return log_error_errno(errno, "Failed to update $PATH: %m"); | |
3115 | } | |
3116 | ||
3117 | execvpe(arg_parameters[0], arg_parameters, env_use); | |
3118 | } else { | |
3119 | if (!arg_chdir) | |
3120 | /* If we cannot change the directory, we'll end up in /, that is expected. */ | |
3121 | (void) chdir(home ?: "/root"); | |
3122 | ||
3123 | execle("/bin/bash", "-bash", NULL, env_use); | |
3124 | execle("/bin/sh", "-sh", NULL, env_use); | |
3125 | ||
3126 | exec_target = "/bin/bash, /bin/sh"; | |
3127 | } | |
3128 | ||
3129 | return log_error_errno(errno, "execv(%s) failed: %m", exec_target); | |
3130 | } | |
3131 | ||
3132 | static int setup_sd_notify_child(void) { | |
3133 | _cleanup_close_ int fd = -1; | |
3134 | union sockaddr_union sa = { | |
3135 | .un.sun_family = AF_UNIX, | |
3136 | .un.sun_path = NSPAWN_NOTIFY_SOCKET_PATH, | |
3137 | }; | |
3138 | int r; | |
3139 | ||
3140 | fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
3141 | if (fd < 0) | |
3142 | return log_error_errno(errno, "Failed to allocate notification socket: %m"); | |
3143 | ||
3144 | (void) mkdir_parents(NSPAWN_NOTIFY_SOCKET_PATH, 0755); | |
3145 | (void) sockaddr_un_unlink(&sa.un); | |
3146 | ||
3147 | r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); | |
3148 | if (r < 0) | |
3149 | return log_error_errno(errno, "bind(" NSPAWN_NOTIFY_SOCKET_PATH ") failed: %m"); | |
3150 | ||
3151 | r = userns_lchown(NSPAWN_NOTIFY_SOCKET_PATH, 0, 0); | |
3152 | if (r < 0) | |
3153 | return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m"); | |
3154 | ||
3155 | r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true); | |
3156 | if (r < 0) | |
3157 | return log_error_errno(r, "SO_PASSCRED failed: %m"); | |
3158 | ||
3159 | return TAKE_FD(fd); | |
3160 | } | |
3161 | ||
3162 | static int outer_child( | |
3163 | Barrier *barrier, | |
3164 | const char *directory, | |
3165 | DissectedImage *dissected_image, | |
3166 | bool secondary, | |
3167 | int pid_socket, | |
3168 | int uuid_socket, | |
3169 | int notify_socket, | |
3170 | int kmsg_socket, | |
3171 | int rtnl_socket, | |
3172 | int uid_shift_socket, | |
3173 | int master_pty_socket, | |
3174 | int unified_cgroup_hierarchy_socket, | |
3175 | FDSet *fds, | |
3176 | int netns_fd) { | |
3177 | ||
3178 | _cleanup_close_ int fd = -1; | |
3179 | pid_t pid; | |
3180 | ssize_t l; | |
3181 | int r; | |
3182 | ||
3183 | /* This is the "outer" child process, i.e the one forked off by the container manager itself. It already has | |
3184 | * its own CLONE_NEWNS namespace (which was created by the clone()). It still lives in the host's CLONE_NEWPID, | |
3185 | * CLONE_NEWUTS, CLONE_NEWIPC, CLONE_NEWUSER and CLONE_NEWNET namespaces. After it completed a number of | |
3186 | * initializations a second child (the "inner" one) is forked off it, and it exits. */ | |
3187 | ||
3188 | assert(barrier); | |
3189 | assert(directory); | |
3190 | assert(pid_socket >= 0); | |
3191 | assert(uuid_socket >= 0); | |
3192 | assert(notify_socket >= 0); | |
3193 | assert(master_pty_socket >= 0); | |
3194 | assert(kmsg_socket >= 0); | |
3195 | ||
3196 | log_debug("Outer child is initializing."); | |
3197 | ||
3198 | if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) | |
3199 | return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m"); | |
3200 | ||
3201 | r = reset_audit_loginuid(); | |
3202 | if (r < 0) | |
3203 | return r; | |
3204 | ||
3205 | /* Mark everything as slave, so that we still | |
3206 | * receive mounts from the real root, but don't | |
3207 | * propagate mounts to the real root. */ | |
3208 | r = mount_verbose(LOG_ERR, NULL, "/", NULL, MS_SLAVE|MS_REC, NULL); | |
3209 | if (r < 0) | |
3210 | return r; | |
3211 | ||
3212 | if (dissected_image) { | |
3213 | /* If we are operating on a disk image, then mount its root directory now, but leave out the rest. We | |
3214 | * can read the UID shift from it if we need to. Further down we'll mount the rest, but then with the | |
3215 | * uid shift known. That way we can mount VFAT file systems shifted to the right place right away. This | |
3216 | * makes sure ESP partitions and userns are compatible. */ | |
3217 | ||
3218 | r = dissected_image_mount(dissected_image, directory, arg_uid_shift, | |
3219 | DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_DISCARD_ON_LOOP| | |
3220 | (arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0)| | |
3221 | (arg_start_mode == START_BOOT ? DISSECT_IMAGE_VALIDATE_OS : 0)); | |
3222 | if (r < 0) | |
3223 | return r; | |
3224 | } | |
3225 | ||
3226 | r = determine_uid_shift(directory); | |
3227 | if (r < 0) | |
3228 | return r; | |
3229 | ||
3230 | if (arg_userns_mode != USER_NAMESPACE_NO) { | |
3231 | /* Let the parent know which UID shift we read from the image */ | |
3232 | l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL); | |
3233 | if (l < 0) | |
3234 | return log_error_errno(errno, "Failed to send UID shift: %m"); | |
3235 | if (l != sizeof(arg_uid_shift)) | |
3236 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
3237 | "Short write while sending UID shift."); | |
3238 | ||
3239 | if (arg_userns_mode == USER_NAMESPACE_PICK) { | |
3240 | /* When we are supposed to pick the UID shift, the parent will check now whether the UID shift | |
3241 | * we just read from the image is available. If yes, it will send the UID shift back to us, if | |
3242 | * not it will pick a different one, and send it back to us. */ | |
3243 | ||
3244 | l = recv(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), 0); | |
3245 | if (l < 0) | |
3246 | return log_error_errno(errno, "Failed to recv UID shift: %m"); | |
3247 | if (l != sizeof(arg_uid_shift)) | |
3248 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
3249 | "Short read while receiving UID shift."); | |
3250 | } | |
3251 | ||
3252 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, | |
3253 | "Selected user namespace base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range); | |
3254 | } | |
3255 | ||
3256 | if (!dissected_image) { | |
3257 | /* Turn directory into bind mount */ | |
3258 | r = mount_verbose(LOG_ERR, directory, directory, NULL, MS_BIND|MS_REC, NULL); | |
3259 | if (r < 0) | |
3260 | return r; | |
3261 | } | |
3262 | ||
3263 | r = setup_pivot_root( | |
3264 | directory, | |
3265 | arg_pivot_root_new, | |
3266 | arg_pivot_root_old); | |
3267 | if (r < 0) | |
3268 | return r; | |
3269 | ||
3270 | r = setup_volatile_mode( | |
3271 | directory, | |
3272 | arg_volatile_mode, | |
3273 | arg_userns_mode != USER_NAMESPACE_NO, | |
3274 | arg_uid_shift, | |
3275 | arg_uid_range, | |
3276 | arg_selinux_apifs_context); | |
3277 | if (r < 0) | |
3278 | return r; | |
3279 | ||
3280 | if (dissected_image) { | |
3281 | /* Now we know the uid shift, let's now mount everything else that might be in the image. */ | |
3282 | r = dissected_image_mount(dissected_image, directory, arg_uid_shift, | |
3283 | DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY|DISSECT_IMAGE_DISCARD_ON_LOOP|(arg_read_only ? DISSECT_IMAGE_READ_ONLY : 0)); | |
3284 | if (r < 0) | |
3285 | return r; | |
3286 | } | |
3287 | ||
3288 | if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) { | |
3289 | /* OK, we don't know yet which cgroup mode to use yet. Let's figure it out, and tell the parent. */ | |
3290 | ||
3291 | r = detect_unified_cgroup_hierarchy_from_image(directory); | |
3292 | if (r < 0) | |
3293 | return r; | |
3294 | ||
3295 | l = send(unified_cgroup_hierarchy_socket, &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), MSG_NOSIGNAL); | |
3296 | if (l < 0) | |
3297 | return log_error_errno(errno, "Failed to send cgroup mode: %m"); | |
3298 | if (l != sizeof(arg_unified_cgroup_hierarchy)) | |
3299 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
3300 | "Short write while sending cgroup mode."); | |
3301 | ||
3302 | unified_cgroup_hierarchy_socket = safe_close(unified_cgroup_hierarchy_socket); | |
3303 | } | |
3304 | ||
3305 | /* Mark everything as shared so our mounts get propagated down. This is | |
3306 | * required to make new bind mounts available in systemd services | |
3307 | * inside the container that create a new mount namespace. | |
3308 | * See https://github.com/systemd/systemd/issues/3860 | |
3309 | * Further submounts (such as /dev) done after this will inherit the | |
3310 | * shared propagation mode. */ | |
3311 | r = mount_verbose(LOG_ERR, NULL, directory, NULL, MS_SHARED|MS_REC, NULL); | |
3312 | if (r < 0) | |
3313 | return r; | |
3314 | ||
3315 | r = recursive_chown(directory, arg_uid_shift, arg_uid_range); | |
3316 | if (r < 0) | |
3317 | return r; | |
3318 | ||
3319 | r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift); | |
3320 | if (r < 0) | |
3321 | return r; | |
3322 | ||
3323 | if (arg_read_only && arg_volatile_mode == VOLATILE_NO) { | |
3324 | r = bind_remount_recursive(directory, MS_RDONLY, MS_RDONLY, NULL); | |
3325 | if (r < 0) | |
3326 | return log_error_errno(r, "Failed to make tree read-only: %m"); | |
3327 | } | |
3328 | ||
3329 | r = mount_all(directory, | |
3330 | arg_mount_settings, | |
3331 | arg_uid_shift, | |
3332 | arg_selinux_apifs_context); | |
3333 | if (r < 0) | |
3334 | return r; | |
3335 | ||
3336 | r = copy_devnodes(directory); | |
3337 | if (r < 0) | |
3338 | return r; | |
3339 | ||
3340 | r = make_extra_nodes(directory); | |
3341 | if (r < 0) | |
3342 | return r; | |
3343 | ||
3344 | (void) dev_setup(directory, arg_uid_shift, arg_uid_shift); | |
3345 | (void) make_inaccessible_nodes(directory, arg_uid_shift, arg_uid_shift); | |
3346 | ||
3347 | r = setup_pts(directory); | |
3348 | if (r < 0) | |
3349 | return r; | |
3350 | ||
3351 | r = setup_propagate(directory); | |
3352 | if (r < 0) | |
3353 | return r; | |
3354 | ||
3355 | r = setup_keyring(); | |
3356 | if (r < 0) | |
3357 | return r; | |
3358 | ||
3359 | r = setup_timezone(directory); | |
3360 | if (r < 0) | |
3361 | return r; | |
3362 | ||
3363 | r = setup_resolv_conf(directory); | |
3364 | if (r < 0) | |
3365 | return r; | |
3366 | ||
3367 | r = setup_machine_id(directory); | |
3368 | if (r < 0) | |
3369 | return r; | |
3370 | ||
3371 | r = setup_journal(directory); | |
3372 | if (r < 0) | |
3373 | return r; | |
3374 | ||
3375 | r = mount_custom( | |
3376 | directory, | |
3377 | arg_custom_mounts, | |
3378 | arg_n_custom_mounts, | |
3379 | arg_userns_mode != USER_NAMESPACE_NO, | |
3380 | arg_uid_shift, | |
3381 | arg_uid_range, | |
3382 | arg_selinux_apifs_context, | |
3383 | false); | |
3384 | if (r < 0) | |
3385 | return r; | |
3386 | ||
3387 | if (!arg_use_cgns) { | |
3388 | r = mount_cgroups( | |
3389 | directory, | |
3390 | arg_unified_cgroup_hierarchy, | |
3391 | arg_userns_mode != USER_NAMESPACE_NO, | |
3392 | arg_uid_shift, | |
3393 | arg_uid_range, | |
3394 | arg_selinux_apifs_context, | |
3395 | false); | |
3396 | if (r < 0) | |
3397 | return r; | |
3398 | } | |
3399 | ||
3400 | r = mount_move_root(directory); | |
3401 | if (r < 0) | |
3402 | return log_error_errno(r, "Failed to move root directory: %m"); | |
3403 | ||
3404 | fd = setup_sd_notify_child(); | |
3405 | if (fd < 0) | |
3406 | return fd; | |
3407 | ||
3408 | pid = raw_clone(SIGCHLD|CLONE_NEWNS| | |
3409 | arg_clone_ns_flags | | |
3410 | (arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0)); | |
3411 | if (pid < 0) | |
3412 | return log_error_errno(errno, "Failed to fork inner child: %m"); | |
3413 | if (pid == 0) { | |
3414 | pid_socket = safe_close(pid_socket); | |
3415 | uuid_socket = safe_close(uuid_socket); | |
3416 | notify_socket = safe_close(notify_socket); | |
3417 | uid_shift_socket = safe_close(uid_shift_socket); | |
3418 | ||
3419 | /* The inner child has all namespaces that are | |
3420 | * requested, so that we all are owned by the user if | |
3421 | * user namespaces are turned on. */ | |
3422 | ||
3423 | if (arg_network_namespace_path) { | |
3424 | r = namespace_enter(-1, -1, netns_fd, -1, -1); | |
3425 | if (r < 0) | |
3426 | return log_error_errno(r, "Failed to join network namespace: %m"); | |
3427 | } | |
3428 | ||
3429 | r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, master_pty_socket, fds); | |
3430 | if (r < 0) | |
3431 | _exit(EXIT_FAILURE); | |
3432 | ||
3433 | _exit(EXIT_SUCCESS); | |
3434 | } | |
3435 | ||
3436 | l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL); | |
3437 | if (l < 0) | |
3438 | return log_error_errno(errno, "Failed to send PID: %m"); | |
3439 | if (l != sizeof(pid)) | |
3440 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
3441 | "Short write while sending PID."); | |
3442 | ||
3443 | l = send(uuid_socket, &arg_uuid, sizeof(arg_uuid), MSG_NOSIGNAL); | |
3444 | if (l < 0) | |
3445 | return log_error_errno(errno, "Failed to send machine ID: %m"); | |
3446 | if (l != sizeof(arg_uuid)) | |
3447 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
3448 | "Short write while sending machine ID."); | |
3449 | ||
3450 | l = send_one_fd(notify_socket, fd, 0); | |
3451 | if (l < 0) | |
3452 | return log_error_errno(l, "Failed to send notify fd: %m"); | |
3453 | ||
3454 | pid_socket = safe_close(pid_socket); | |
3455 | uuid_socket = safe_close(uuid_socket); | |
3456 | notify_socket = safe_close(notify_socket); | |
3457 | master_pty_socket = safe_close(master_pty_socket); | |
3458 | kmsg_socket = safe_close(kmsg_socket); | |
3459 | rtnl_socket = safe_close(rtnl_socket); | |
3460 | netns_fd = safe_close(netns_fd); | |
3461 | ||
3462 | return 0; | |
3463 | } | |
3464 | ||
3465 | static int uid_shift_pick(uid_t *shift, LockFile *ret_lock_file) { | |
3466 | bool tried_hashed = false; | |
3467 | unsigned n_tries = 100; | |
3468 | uid_t candidate; | |
3469 | int r; | |
3470 | ||
3471 | assert(shift); | |
3472 | assert(ret_lock_file); | |
3473 | assert(arg_userns_mode == USER_NAMESPACE_PICK); | |
3474 | assert(arg_uid_range == 0x10000U); | |
3475 | ||
3476 | candidate = *shift; | |
3477 | ||
3478 | (void) mkdir("/run/systemd/nspawn-uid", 0755); | |
3479 | ||
3480 | for (;;) { | |
3481 | char lock_path[STRLEN("/run/systemd/nspawn-uid/") + DECIMAL_STR_MAX(uid_t) + 1]; | |
3482 | _cleanup_(release_lock_file) LockFile lf = LOCK_FILE_INIT; | |
3483 | ||
3484 | if (--n_tries <= 0) | |
3485 | return -EBUSY; | |
3486 | ||
3487 | if (candidate < CONTAINER_UID_BASE_MIN || candidate > CONTAINER_UID_BASE_MAX) | |
3488 | goto next; | |
3489 | if ((candidate & UINT32_C(0xFFFF)) != 0) | |
3490 | goto next; | |
3491 | ||
3492 | xsprintf(lock_path, "/run/systemd/nspawn-uid/" UID_FMT, candidate); | |
3493 | r = make_lock_file(lock_path, LOCK_EX|LOCK_NB, &lf); | |
3494 | if (r == -EBUSY) /* Range already taken by another nspawn instance */ | |
3495 | goto next; | |
3496 | if (r < 0) | |
3497 | return r; | |
3498 | ||
3499 | /* Make some superficial checks whether the range is currently known in the user database */ | |
3500 | if (getpwuid(candidate)) | |
3501 | goto next; | |
3502 | if (getpwuid(candidate + UINT32_C(0xFFFE))) | |
3503 | goto next; | |
3504 | if (getgrgid(candidate)) | |
3505 | goto next; | |
3506 | if (getgrgid(candidate + UINT32_C(0xFFFE))) | |
3507 | goto next; | |
3508 | ||
3509 | *ret_lock_file = lf; | |
3510 | lf = (struct LockFile) LOCK_FILE_INIT; | |
3511 | *shift = candidate; | |
3512 | return 0; | |
3513 | ||
3514 | next: | |
3515 | if (arg_machine && !tried_hashed) { | |
3516 | /* Try to hash the base from the container name */ | |
3517 | ||
3518 | static const uint8_t hash_key[] = { | |
3519 | 0xe1, 0x56, 0xe0, 0xf0, 0x4a, 0xf0, 0x41, 0xaf, | |
3520 | 0x96, 0x41, 0xcf, 0x41, 0x33, 0x94, 0xff, 0x72 | |
3521 | }; | |
3522 | ||
3523 | candidate = (uid_t) siphash24(arg_machine, strlen(arg_machine), hash_key); | |
3524 | ||
3525 | tried_hashed = true; | |
3526 | } else | |
3527 | random_bytes(&candidate, sizeof(candidate)); | |
3528 | ||
3529 | candidate = (candidate % (CONTAINER_UID_BASE_MAX - CONTAINER_UID_BASE_MIN)) + CONTAINER_UID_BASE_MIN; | |
3530 | candidate &= (uid_t) UINT32_C(0xFFFF0000); | |
3531 | } | |
3532 | } | |
3533 | ||
3534 | static int setup_uid_map(pid_t pid) { | |
3535 | char uid_map[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1]; | |
3536 | int r; | |
3537 | ||
3538 | assert(pid > 1); | |
3539 | ||
3540 | xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid); | |
3541 | xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range); | |
3542 | r = write_string_file(uid_map, line, WRITE_STRING_FILE_DISABLE_BUFFER); | |
3543 | if (r < 0) | |
3544 | return log_error_errno(r, "Failed to write UID map: %m"); | |
3545 | ||
3546 | /* We always assign the same UID and GID ranges */ | |
3547 | xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid); | |
3548 | r = write_string_file(uid_map, line, WRITE_STRING_FILE_DISABLE_BUFFER); | |
3549 | if (r < 0) | |
3550 | return log_error_errno(r, "Failed to write GID map: %m"); | |
3551 | ||
3552 | return 0; | |
3553 | } | |
3554 | ||
3555 | static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
3556 | char buf[NOTIFY_BUFFER_MAX+1]; | |
3557 | char *p = NULL; | |
3558 | struct iovec iovec = { | |
3559 | .iov_base = buf, | |
3560 | .iov_len = sizeof(buf)-1, | |
3561 | }; | |
3562 | union { | |
3563 | struct cmsghdr cmsghdr; | |
3564 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) + | |
3565 | CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)]; | |
3566 | } control = {}; | |
3567 | struct msghdr msghdr = { | |
3568 | .msg_iov = &iovec, | |
3569 | .msg_iovlen = 1, | |
3570 | .msg_control = &control, | |
3571 | .msg_controllen = sizeof(control), | |
3572 | }; | |
3573 | struct cmsghdr *cmsg; | |
3574 | struct ucred *ucred = NULL; | |
3575 | ssize_t n; | |
3576 | pid_t inner_child_pid; | |
3577 | _cleanup_strv_free_ char **tags = NULL; | |
3578 | ||
3579 | assert(userdata); | |
3580 | ||
3581 | inner_child_pid = PTR_TO_PID(userdata); | |
3582 | ||
3583 | if (revents != EPOLLIN) { | |
3584 | log_warning("Got unexpected poll event for notify fd."); | |
3585 | return 0; | |
3586 | } | |
3587 | ||
3588 | n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); | |
3589 | if (n < 0) { | |
3590 | if (IN_SET(errno, EAGAIN, EINTR)) | |
3591 | return 0; | |
3592 | ||
3593 | return log_warning_errno(errno, "Couldn't read notification socket: %m"); | |
3594 | } | |
3595 | cmsg_close_all(&msghdr); | |
3596 | ||
3597 | CMSG_FOREACH(cmsg, &msghdr) { | |
3598 | if (cmsg->cmsg_level == SOL_SOCKET && | |
3599 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
3600 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
3601 | ||
3602 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
3603 | } | |
3604 | } | |
3605 | ||
3606 | if (!ucred || ucred->pid != inner_child_pid) { | |
3607 | log_debug("Received notify message without valid credentials. Ignoring."); | |
3608 | return 0; | |
3609 | } | |
3610 | ||
3611 | if ((size_t) n >= sizeof(buf)) { | |
3612 | log_warning("Received notify message exceeded maximum size. Ignoring."); | |
3613 | return 0; | |
3614 | } | |
3615 | ||
3616 | buf[n] = 0; | |
3617 | tags = strv_split(buf, "\n\r"); | |
3618 | if (!tags) | |
3619 | return log_oom(); | |
3620 | ||
3621 | if (strv_find(tags, "READY=1")) | |
3622 | (void) sd_notifyf(false, "READY=1\n"); | |
3623 | ||
3624 | p = strv_find_startswith(tags, "STATUS="); | |
3625 | if (p) | |
3626 | (void) sd_notifyf(false, "STATUS=Container running: %s", p); | |
3627 | ||
3628 | return 0; | |
3629 | } | |
3630 | ||
3631 | static int setup_sd_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) { | |
3632 | int r; | |
3633 | ||
3634 | r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid); | |
3635 | if (r < 0) | |
3636 | return log_error_errno(r, "Failed to allocate notify event source: %m"); | |
3637 | ||
3638 | (void) sd_event_source_set_description(*notify_event_source, "nspawn-notify"); | |
3639 | ||
3640 | return 0; | |
3641 | } | |
3642 | ||
3643 | static int merge_settings(Settings *settings, const char *path) { | |
3644 | int rl; | |
3645 | ||
3646 | assert(settings); | |
3647 | assert(path); | |
3648 | ||
3649 | /* Copy over bits from the settings, unless they have been explicitly masked by command line switches. Note | |
3650 | * that this steals the fields of the Settings* structure, and hence modifies it. */ | |
3651 | ||
3652 | if ((arg_settings_mask & SETTING_START_MODE) == 0 && | |
3653 | settings->start_mode >= 0) { | |
3654 | arg_start_mode = settings->start_mode; | |
3655 | strv_free_and_replace(arg_parameters, settings->parameters); | |
3656 | } | |
3657 | ||
3658 | if ((arg_settings_mask & SETTING_EPHEMERAL) == 0) | |
3659 | arg_ephemeral = settings->ephemeral; | |
3660 | ||
3661 | if ((arg_settings_mask & SETTING_DIRECTORY) == 0 && | |
3662 | settings->root) { | |
3663 | ||
3664 | if (!arg_settings_trusted) | |
3665 | log_warning("Ignoring root directory setting, file %s is not trusted.", path); | |
3666 | else | |
3667 | free_and_replace(arg_directory, settings->root); | |
3668 | } | |
3669 | ||
3670 | if ((arg_settings_mask & SETTING_PIVOT_ROOT) == 0 && | |
3671 | settings->pivot_root_new) { | |
3672 | free_and_replace(arg_pivot_root_new, settings->pivot_root_new); | |
3673 | free_and_replace(arg_pivot_root_old, settings->pivot_root_old); | |
3674 | } | |
3675 | ||
3676 | if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 && | |
3677 | settings->working_directory) | |
3678 | free_and_replace(arg_chdir, settings->working_directory); | |
3679 | ||
3680 | if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 && | |
3681 | settings->environment) | |
3682 | strv_free_and_replace(arg_setenv, settings->environment); | |
3683 | ||
3684 | if ((arg_settings_mask & SETTING_USER) == 0) { | |
3685 | ||
3686 | if (settings->user) | |
3687 | free_and_replace(arg_user, settings->user); | |
3688 | ||
3689 | if (uid_is_valid(settings->uid)) | |
3690 | arg_uid = settings->uid; | |
3691 | if (gid_is_valid(settings->gid)) | |
3692 | arg_gid = settings->gid; | |
3693 | if (settings->n_supplementary_gids > 0) { | |
3694 | free_and_replace(arg_supplementary_gids, settings->supplementary_gids); | |
3695 | arg_n_supplementary_gids = settings->n_supplementary_gids; | |
3696 | } | |
3697 | } | |
3698 | ||
3699 | if ((arg_settings_mask & SETTING_CAPABILITY) == 0) { | |
3700 | uint64_t plus, minus; | |
3701 | ||
3702 | /* Note that we copy both the simple plus/minus caps here, and the full quintet from the | |
3703 | * Settings structure */ | |
3704 | ||
3705 | plus = settings->capability; | |
3706 | minus = settings->drop_capability; | |
3707 | ||
3708 | if ((arg_settings_mask & SETTING_NETWORK) == 0) { | |
3709 | if (settings_private_network(settings)) | |
3710 | plus |= UINT64_C(1) << CAP_NET_ADMIN; | |
3711 | else | |
3712 | minus |= UINT64_C(1) << CAP_NET_ADMIN; | |
3713 | } | |
3714 | ||
3715 | if (!arg_settings_trusted && plus != 0) { | |
3716 | if (settings->capability != 0) | |
3717 | log_warning("Ignoring Capability= setting, file %s is not trusted.", path); | |
3718 | } else | |
3719 | arg_caps_retain |= plus; | |
3720 | ||
3721 | arg_caps_retain &= ~minus; | |
3722 | ||
3723 | /* Copy the full capabilities over too */ | |
3724 | if (capability_quintet_is_set(&settings->full_capabilities)) { | |
3725 | if (!arg_settings_trusted) | |
3726 | log_warning("Ignoring capability settings, file %s is not trusted.", path); | |
3727 | else | |
3728 | arg_full_capabilities = settings->full_capabilities; | |
3729 | } | |
3730 | } | |
3731 | ||
3732 | if ((arg_settings_mask & SETTING_KILL_SIGNAL) == 0 && | |
3733 | settings->kill_signal > 0) | |
3734 | arg_kill_signal = settings->kill_signal; | |
3735 | ||
3736 | if ((arg_settings_mask & SETTING_PERSONALITY) == 0 && | |
3737 | settings->personality != PERSONALITY_INVALID) | |
3738 | arg_personality = settings->personality; | |
3739 | ||
3740 | if ((arg_settings_mask & SETTING_MACHINE_ID) == 0 && | |
3741 | !sd_id128_is_null(settings->machine_id)) { | |
3742 | ||
3743 | if (!arg_settings_trusted) | |
3744 | log_warning("Ignoring MachineID= setting, file %s is not trusted.", path); | |
3745 | else | |
3746 | arg_uuid = settings->machine_id; | |
3747 | } | |
3748 | ||
3749 | if ((arg_settings_mask & SETTING_READ_ONLY) == 0 && | |
3750 | settings->read_only >= 0) | |
3751 | arg_read_only = settings->read_only; | |
3752 | ||
3753 | if ((arg_settings_mask & SETTING_VOLATILE_MODE) == 0 && | |
3754 | settings->volatile_mode != _VOLATILE_MODE_INVALID) | |
3755 | arg_volatile_mode = settings->volatile_mode; | |
3756 | ||
3757 | if ((arg_settings_mask & SETTING_CUSTOM_MOUNTS) == 0 && | |
3758 | settings->n_custom_mounts > 0) { | |
3759 | ||
3760 | if (!arg_settings_trusted) | |
3761 | log_warning("Ignoring TemporaryFileSystem=, Bind= and BindReadOnly= settings, file %s is not trusted.", path); | |
3762 | else { | |
3763 | custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts); | |
3764 | arg_custom_mounts = TAKE_PTR(settings->custom_mounts); | |
3765 | arg_n_custom_mounts = settings->n_custom_mounts; | |
3766 | settings->n_custom_mounts = 0; | |
3767 | } | |
3768 | } | |
3769 | ||
3770 | if ((arg_settings_mask & SETTING_NETWORK) == 0 && | |
3771 | (settings->private_network >= 0 || | |
3772 | settings->network_veth >= 0 || | |
3773 | settings->network_bridge || | |
3774 | settings->network_zone || | |
3775 | settings->network_interfaces || | |
3776 | settings->network_macvlan || | |
3777 | settings->network_ipvlan || | |
3778 | settings->network_veth_extra || | |
3779 | settings->network_namespace_path)) { | |
3780 | ||
3781 | if (!arg_settings_trusted) | |
3782 | log_warning("Ignoring network settings, file %s is not trusted.", path); | |
3783 | else { | |
3784 | arg_network_veth = settings_network_veth(settings); | |
3785 | arg_private_network = settings_private_network(settings); | |
3786 | ||
3787 | strv_free_and_replace(arg_network_interfaces, settings->network_interfaces); | |
3788 | strv_free_and_replace(arg_network_macvlan, settings->network_macvlan); | |
3789 | strv_free_and_replace(arg_network_ipvlan, settings->network_ipvlan); | |
3790 | strv_free_and_replace(arg_network_veth_extra, settings->network_veth_extra); | |
3791 | ||
3792 | free_and_replace(arg_network_bridge, settings->network_bridge); | |
3793 | free_and_replace(arg_network_zone, settings->network_zone); | |
3794 | ||
3795 | free_and_replace(arg_network_namespace_path, settings->network_namespace_path); | |
3796 | } | |
3797 | } | |
3798 | ||
3799 | if ((arg_settings_mask & SETTING_EXPOSE_PORTS) == 0 && | |
3800 | settings->expose_ports) { | |
3801 | ||
3802 | if (!arg_settings_trusted) | |
3803 | log_warning("Ignoring Port= setting, file %s is not trusted.", path); | |
3804 | else { | |
3805 | expose_port_free_all(arg_expose_ports); | |
3806 | arg_expose_ports = TAKE_PTR(settings->expose_ports); | |
3807 | } | |
3808 | } | |
3809 | ||
3810 | if ((arg_settings_mask & SETTING_USERNS) == 0 && | |
3811 | settings->userns_mode != _USER_NAMESPACE_MODE_INVALID) { | |
3812 | ||
3813 | if (!arg_settings_trusted) | |
3814 | log_warning("Ignoring PrivateUsers= and PrivateUsersChown= settings, file %s is not trusted.", path); | |
3815 | else { | |
3816 | arg_userns_mode = settings->userns_mode; | |
3817 | arg_uid_shift = settings->uid_shift; | |
3818 | arg_uid_range = settings->uid_range; | |
3819 | arg_userns_chown = settings->userns_chown; | |
3820 | } | |
3821 | } | |
3822 | ||
3823 | if ((arg_settings_mask & SETTING_NOTIFY_READY) == 0) | |
3824 | arg_notify_ready = settings->notify_ready; | |
3825 | ||
3826 | if ((arg_settings_mask & SETTING_SYSCALL_FILTER) == 0) { | |
3827 | ||
3828 | if (!arg_settings_trusted && !strv_isempty(settings->syscall_whitelist)) | |
3829 | log_warning("Ignoring SystemCallFilter= settings, file %s is not trusted.", path); | |
3830 | else { | |
3831 | strv_free_and_replace(arg_syscall_whitelist, settings->syscall_whitelist); | |
3832 | strv_free_and_replace(arg_syscall_blacklist, settings->syscall_blacklist); | |
3833 | } | |
3834 | ||
3835 | #if HAVE_SECCOMP | |
3836 | if (!arg_settings_trusted && settings->seccomp) | |
3837 | log_warning("Ignoring SECCOMP filter, file %s is not trusted.", path); | |
3838 | else { | |
3839 | seccomp_release(arg_seccomp); | |
3840 | arg_seccomp = TAKE_PTR(settings->seccomp); | |
3841 | } | |
3842 | #endif | |
3843 | } | |
3844 | ||
3845 | for (rl = 0; rl < _RLIMIT_MAX; rl ++) { | |
3846 | if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl))) | |
3847 | continue; | |
3848 | ||
3849 | if (!settings->rlimit[rl]) | |
3850 | continue; | |
3851 | ||
3852 | if (!arg_settings_trusted) { | |
3853 | log_warning("Ignoring Limit%s= setting, file '%s' is not trusted.", rlimit_to_string(rl), path); | |
3854 | continue; | |
3855 | } | |
3856 | ||
3857 | free_and_replace(arg_rlimit[rl], settings->rlimit[rl]); | |
3858 | } | |
3859 | ||
3860 | if ((arg_settings_mask & SETTING_HOSTNAME) == 0 && | |
3861 | settings->hostname) | |
3862 | free_and_replace(arg_hostname, settings->hostname); | |
3863 | ||
3864 | if ((arg_settings_mask & SETTING_NO_NEW_PRIVILEGES) == 0 && | |
3865 | settings->no_new_privileges >= 0) | |
3866 | arg_no_new_privileges = settings->no_new_privileges; | |
3867 | ||
3868 | if ((arg_settings_mask & SETTING_OOM_SCORE_ADJUST) == 0 && | |
3869 | settings->oom_score_adjust_set) { | |
3870 | ||
3871 | if (!arg_settings_trusted) | |
3872 | log_warning("Ignoring OOMScoreAdjust= setting, file '%s' is not trusted.", path); | |
3873 | else { | |
3874 | arg_oom_score_adjust = settings->oom_score_adjust; | |
3875 | arg_oom_score_adjust_set = true; | |
3876 | } | |
3877 | } | |
3878 | ||
3879 | if ((arg_settings_mask & SETTING_CPU_AFFINITY) == 0 && | |
3880 | settings->cpu_set.set) { | |
3881 | ||
3882 | if (!arg_settings_trusted) | |
3883 | log_warning("Ignoring CPUAffinity= setting, file '%s' is not trusted.", path); | |
3884 | else { | |
3885 | cpu_set_reset(&arg_cpu_set); | |
3886 | arg_cpu_set = settings->cpu_set; | |
3887 | settings->cpu_set = (CPUSet) {}; | |
3888 | } | |
3889 | } | |
3890 | ||
3891 | if ((arg_settings_mask & SETTING_RESOLV_CONF) == 0 && | |
3892 | settings->resolv_conf != _RESOLV_CONF_MODE_INVALID) | |
3893 | arg_resolv_conf = settings->resolv_conf; | |
3894 | ||
3895 | if ((arg_settings_mask & SETTING_LINK_JOURNAL) == 0 && | |
3896 | settings->link_journal != _LINK_JOURNAL_INVALID) { | |
3897 | ||
3898 | if (!arg_settings_trusted) | |
3899 | log_warning("Ignoring journal link setting, file '%s' is not trusted.", path); | |
3900 | else { | |
3901 | arg_link_journal = settings->link_journal; | |
3902 | arg_link_journal_try = settings->link_journal_try; | |
3903 | } | |
3904 | } | |
3905 | ||
3906 | if ((arg_settings_mask & SETTING_TIMEZONE) == 0 && | |
3907 | settings->timezone != _TIMEZONE_MODE_INVALID) | |
3908 | arg_timezone = settings->timezone; | |
3909 | ||
3910 | if ((arg_settings_mask & SETTING_SLICE) == 0 && | |
3911 | settings->slice) { | |
3912 | ||
3913 | if (!arg_settings_trusted) | |
3914 | log_warning("Ignoring slice setting, file '%s' is not trusted.", path); | |
3915 | else | |
3916 | free_and_replace(arg_slice, settings->slice); | |
3917 | } | |
3918 | ||
3919 | if ((arg_settings_mask & SETTING_USE_CGNS) == 0 && | |
3920 | settings->use_cgns >= 0) { | |
3921 | ||
3922 | if (!arg_settings_trusted) | |
3923 | log_warning("Ignoring cgroup namespace setting, file '%s' is not trusted.", path); | |
3924 | else | |
3925 | arg_use_cgns = settings->use_cgns; | |
3926 | } | |
3927 | ||
3928 | if ((arg_settings_mask & SETTING_CLONE_NS_FLAGS) == 0 && | |
3929 | settings->clone_ns_flags != (unsigned long) -1) { | |
3930 | ||
3931 | if (!arg_settings_trusted) | |
3932 | log_warning("Ignoring namespace setting, file '%s' is not trusted.", path); | |
3933 | else | |
3934 | arg_clone_ns_flags = settings->clone_ns_flags; | |
3935 | } | |
3936 | ||
3937 | if ((arg_settings_mask & SETTING_CONSOLE_MODE) == 0 && | |
3938 | settings->console_mode >= 0) { | |
3939 | ||
3940 | if (!arg_settings_trusted) | |
3941 | log_warning("Ignoring console mode setting, file '%s' is not trusted.", path); | |
3942 | else | |
3943 | arg_console_mode = settings->console_mode; | |
3944 | } | |
3945 | ||
3946 | /* The following properties can only be set through the OCI settings logic, not from the command line, hence we | |
3947 | * don't consult arg_settings_mask for them. */ | |
3948 | ||
3949 | sd_bus_message_unref(arg_property_message); | |
3950 | arg_property_message = TAKE_PTR(settings->properties); | |
3951 | ||
3952 | arg_console_width = settings->console_width; | |
3953 | arg_console_height = settings->console_height; | |
3954 | ||
3955 | device_node_array_free(arg_extra_nodes, arg_n_extra_nodes); | |
3956 | arg_extra_nodes = TAKE_PTR(settings->extra_nodes); | |
3957 | arg_n_extra_nodes = settings->n_extra_nodes; | |
3958 | ||
3959 | return 0; | |
3960 | } | |
3961 | ||
3962 | static int load_settings(void) { | |
3963 | _cleanup_(settings_freep) Settings *settings = NULL; | |
3964 | _cleanup_fclose_ FILE *f = NULL; | |
3965 | _cleanup_free_ char *p = NULL; | |
3966 | const char *fn, *i; | |
3967 | int r; | |
3968 | ||
3969 | if (arg_oci_bundle) | |
3970 | return 0; | |
3971 | ||
3972 | /* If all settings are masked, there's no point in looking for | |
3973 | * the settings file */ | |
3974 | if ((arg_settings_mask & _SETTINGS_MASK_ALL) == _SETTINGS_MASK_ALL) | |
3975 | return 0; | |
3976 | ||
3977 | fn = strjoina(arg_machine, ".nspawn"); | |
3978 | ||
3979 | /* We first look in the admin's directories in /etc and /run */ | |
3980 | FOREACH_STRING(i, "/etc/systemd/nspawn", "/run/systemd/nspawn") { | |
3981 | _cleanup_free_ char *j = NULL; | |
3982 | ||
3983 | j = path_join(i, fn); | |
3984 | if (!j) | |
3985 | return log_oom(); | |
3986 | ||
3987 | f = fopen(j, "re"); | |
3988 | if (f) { | |
3989 | p = TAKE_PTR(j); | |
3990 | ||
3991 | /* By default, we trust configuration from /etc and /run */ | |
3992 | if (arg_settings_trusted < 0) | |
3993 | arg_settings_trusted = true; | |
3994 | ||
3995 | break; | |
3996 | } | |
3997 | ||
3998 | if (errno != ENOENT) | |
3999 | return log_error_errno(errno, "Failed to open %s: %m", j); | |
4000 | } | |
4001 | ||
4002 | if (!f) { | |
4003 | /* After that, let's look for a file next to the | |
4004 | * actual image we shall boot. */ | |
4005 | ||
4006 | if (arg_image) { | |
4007 | p = file_in_same_dir(arg_image, fn); | |
4008 | if (!p) | |
4009 | return log_oom(); | |
4010 | } else if (arg_directory) { | |
4011 | p = file_in_same_dir(arg_directory, fn); | |
4012 | if (!p) | |
4013 | return log_oom(); | |
4014 | } | |
4015 | ||
4016 | if (p) { | |
4017 | f = fopen(p, "re"); | |
4018 | if (!f && errno != ENOENT) | |
4019 | return log_error_errno(errno, "Failed to open %s: %m", p); | |
4020 | ||
4021 | /* By default, we do not trust configuration from /var/lib/machines */ | |
4022 | if (arg_settings_trusted < 0) | |
4023 | arg_settings_trusted = false; | |
4024 | } | |
4025 | } | |
4026 | ||
4027 | if (!f) | |
4028 | return 0; | |
4029 | ||
4030 | log_debug("Settings are trusted: %s", yes_no(arg_settings_trusted)); | |
4031 | ||
4032 | r = settings_load(f, p, &settings); | |
4033 | if (r < 0) | |
4034 | return r; | |
4035 | ||
4036 | return merge_settings(settings, p); | |
4037 | } | |
4038 | ||
4039 | static int load_oci_bundle(void) { | |
4040 | _cleanup_(settings_freep) Settings *settings = NULL; | |
4041 | int r; | |
4042 | ||
4043 | if (!arg_oci_bundle) | |
4044 | return 0; | |
4045 | ||
4046 | /* By default let's trust OCI bundles */ | |
4047 | if (arg_settings_trusted < 0) | |
4048 | arg_settings_trusted = true; | |
4049 | ||
4050 | r = oci_load(NULL, arg_oci_bundle, &settings); | |
4051 | if (r < 0) | |
4052 | return r; | |
4053 | ||
4054 | return merge_settings(settings, arg_oci_bundle); | |
4055 | } | |
4056 | ||
4057 | static int run_container( | |
4058 | DissectedImage *dissected_image, | |
4059 | bool secondary, | |
4060 | FDSet *fds, | |
4061 | char veth_name[IFNAMSIZ], bool *veth_created, | |
4062 | union in_addr_union *exposed, | |
4063 | int *master, pid_t *pid, int *ret) { | |
4064 | ||
4065 | static const struct sigaction sa = { | |
4066 | .sa_handler = nop_signal_handler, | |
4067 | .sa_flags = SA_NOCLDSTOP|SA_RESTART, | |
4068 | }; | |
4069 | ||
4070 | _cleanup_(release_lock_file) LockFile uid_shift_lock = LOCK_FILE_INIT; | |
4071 | _cleanup_close_ int etc_passwd_lock = -1; | |
4072 | _cleanup_close_pair_ int | |
4073 | kmsg_socket_pair[2] = { -1, -1 }, | |
4074 | rtnl_socket_pair[2] = { -1, -1 }, | |
4075 | pid_socket_pair[2] = { -1, -1 }, | |
4076 | uuid_socket_pair[2] = { -1, -1 }, | |
4077 | notify_socket_pair[2] = { -1, -1 }, | |
4078 | uid_shift_socket_pair[2] = { -1, -1 }, | |
4079 | master_pty_socket_pair[2] = { -1, -1 }, | |
4080 | unified_cgroup_hierarchy_socket_pair[2] = { -1, -1}; | |
4081 | ||
4082 | _cleanup_close_ int notify_socket = -1; | |
4083 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; | |
4084 | _cleanup_(sd_event_source_unrefp) sd_event_source *notify_event_source = NULL; | |
4085 | _cleanup_(sd_event_unrefp) sd_event *event = NULL; | |
4086 | _cleanup_(pty_forward_freep) PTYForward *forward = NULL; | |
4087 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; | |
4088 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
4089 | ContainerStatus container_status = 0; | |
4090 | int ifi = 0, r; | |
4091 | ssize_t l; | |
4092 | sigset_t mask_chld; | |
4093 | _cleanup_close_ int netns_fd = -1; | |
4094 | ||
4095 | assert_se(sigemptyset(&mask_chld) == 0); | |
4096 | assert_se(sigaddset(&mask_chld, SIGCHLD) == 0); | |
4097 | ||
4098 | if (arg_userns_mode == USER_NAMESPACE_PICK) { | |
4099 | /* When we shall pick the UID/GID range, let's first lock /etc/passwd, so that we can safely | |
4100 | * check with getpwuid() if the specific user already exists. Note that /etc might be | |
4101 | * read-only, in which case this will fail with EROFS. But that's really OK, as in that case we | |
4102 | * can be reasonably sure that no users are going to be added. Note that getpwuid() checks are | |
4103 | * really just an extra safety net. We kinda assume that the UID range we allocate from is | |
4104 | * really ours. */ | |
4105 | ||
4106 | etc_passwd_lock = take_etc_passwd_lock(NULL); | |
4107 | if (etc_passwd_lock < 0 && etc_passwd_lock != -EROFS) | |
4108 | return log_error_errno(etc_passwd_lock, "Failed to take /etc/passwd lock: %m"); | |
4109 | } | |
4110 | ||
4111 | r = barrier_create(&barrier); | |
4112 | if (r < 0) | |
4113 | return log_error_errno(r, "Cannot initialize IPC barrier: %m"); | |
4114 | ||
4115 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) | |
4116 | return log_error_errno(errno, "Failed to create kmsg socket pair: %m"); | |
4117 | ||
4118 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) | |
4119 | return log_error_errno(errno, "Failed to create rtnl socket pair: %m"); | |
4120 | ||
4121 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, pid_socket_pair) < 0) | |
4122 | return log_error_errno(errno, "Failed to create pid socket pair: %m"); | |
4123 | ||
4124 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uuid_socket_pair) < 0) | |
4125 | return log_error_errno(errno, "Failed to create id socket pair: %m"); | |
4126 | ||
4127 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, notify_socket_pair) < 0) | |
4128 | return log_error_errno(errno, "Failed to create notify socket pair: %m"); | |
4129 | ||
4130 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, master_pty_socket_pair) < 0) | |
4131 | return log_error_errno(errno, "Failed to create console socket pair: %m"); | |
4132 | ||
4133 | if (arg_userns_mode != USER_NAMESPACE_NO) | |
4134 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0) | |
4135 | return log_error_errno(errno, "Failed to create uid shift socket pair: %m"); | |
4136 | ||
4137 | if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) | |
4138 | if (socketpair(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0, unified_cgroup_hierarchy_socket_pair) < 0) | |
4139 | return log_error_errno(errno, "Failed to create unified cgroup socket pair: %m"); | |
4140 | ||
4141 | /* Child can be killed before execv(), so handle SIGCHLD in order to interrupt | |
4142 | * parent's blocking calls and give it a chance to call wait() and terminate. */ | |
4143 | r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL); | |
4144 | if (r < 0) | |
4145 | return log_error_errno(errno, "Failed to change the signal mask: %m"); | |
4146 | ||
4147 | r = sigaction(SIGCHLD, &sa, NULL); | |
4148 | if (r < 0) | |
4149 | return log_error_errno(errno, "Failed to install SIGCHLD handler: %m"); | |
4150 | ||
4151 | if (arg_network_namespace_path) { | |
4152 | netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
4153 | if (netns_fd < 0) | |
4154 | return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path); | |
4155 | ||
4156 | r = fd_is_network_ns(netns_fd); | |
4157 | if (r == -EUCLEAN) | |
4158 | 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); | |
4159 | else if (r < 0) | |
4160 | return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path); | |
4161 | else if (r == 0) | |
4162 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
4163 | "Path %s doesn't refer to a network namespace, refusing.", arg_network_namespace_path); | |
4164 | } | |
4165 | ||
4166 | *pid = raw_clone(SIGCHLD|CLONE_NEWNS); | |
4167 | if (*pid < 0) | |
4168 | return log_error_errno(errno, "clone() failed%s: %m", | |
4169 | errno == EINVAL ? | |
4170 | ", do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in)" : ""); | |
4171 | ||
4172 | if (*pid == 0) { | |
4173 | /* The outer child only has a file system namespace. */ | |
4174 | barrier_set_role(&barrier, BARRIER_CHILD); | |
4175 | ||
4176 | kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]); | |
4177 | rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]); | |
4178 | pid_socket_pair[0] = safe_close(pid_socket_pair[0]); | |
4179 | uuid_socket_pair[0] = safe_close(uuid_socket_pair[0]); | |
4180 | notify_socket_pair[0] = safe_close(notify_socket_pair[0]); | |
4181 | master_pty_socket_pair[0] = safe_close(master_pty_socket_pair[0]); | |
4182 | uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]); | |
4183 | unified_cgroup_hierarchy_socket_pair[0] = safe_close(unified_cgroup_hierarchy_socket_pair[0]); | |
4184 | ||
4185 | (void) reset_all_signal_handlers(); | |
4186 | (void) reset_signal_mask(); | |
4187 | ||
4188 | r = outer_child(&barrier, | |
4189 | arg_directory, | |
4190 | dissected_image, | |
4191 | secondary, | |
4192 | pid_socket_pair[1], | |
4193 | uuid_socket_pair[1], | |
4194 | notify_socket_pair[1], | |
4195 | kmsg_socket_pair[1], | |
4196 | rtnl_socket_pair[1], | |
4197 | uid_shift_socket_pair[1], | |
4198 | master_pty_socket_pair[1], | |
4199 | unified_cgroup_hierarchy_socket_pair[1], | |
4200 | fds, | |
4201 | netns_fd); | |
4202 | if (r < 0) | |
4203 | _exit(EXIT_FAILURE); | |
4204 | ||
4205 | _exit(EXIT_SUCCESS); | |
4206 | } | |
4207 | ||
4208 | barrier_set_role(&barrier, BARRIER_PARENT); | |
4209 | ||
4210 | fdset_close(fds); | |
4211 | ||
4212 | kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]); | |
4213 | rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]); | |
4214 | pid_socket_pair[1] = safe_close(pid_socket_pair[1]); | |
4215 | uuid_socket_pair[1] = safe_close(uuid_socket_pair[1]); | |
4216 | notify_socket_pair[1] = safe_close(notify_socket_pair[1]); | |
4217 | master_pty_socket_pair[1] = safe_close(master_pty_socket_pair[1]); | |
4218 | uid_shift_socket_pair[1] = safe_close(uid_shift_socket_pair[1]); | |
4219 | unified_cgroup_hierarchy_socket_pair[1] = safe_close(unified_cgroup_hierarchy_socket_pair[1]); | |
4220 | ||
4221 | if (arg_userns_mode != USER_NAMESPACE_NO) { | |
4222 | /* The child just let us know the UID shift it might have read from the image. */ | |
4223 | l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0); | |
4224 | if (l < 0) | |
4225 | return log_error_errno(errno, "Failed to read UID shift: %m"); | |
4226 | if (l != sizeof arg_uid_shift) | |
4227 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading UID shift."); | |
4228 | ||
4229 | if (arg_userns_mode == USER_NAMESPACE_PICK) { | |
4230 | /* If we are supposed to pick the UID shift, let's try to use the shift read from the | |
4231 | * image, but if that's already in use, pick a new one, and report back to the child, | |
4232 | * which one we now picked. */ | |
4233 | ||
4234 | r = uid_shift_pick(&arg_uid_shift, &uid_shift_lock); | |
4235 | if (r < 0) | |
4236 | return log_error_errno(r, "Failed to pick suitable UID/GID range: %m"); | |
4237 | ||
4238 | l = send(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, MSG_NOSIGNAL); | |
4239 | if (l < 0) | |
4240 | return log_error_errno(errno, "Failed to send UID shift: %m"); | |
4241 | if (l != sizeof arg_uid_shift) | |
4242 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write while writing UID shift."); | |
4243 | } | |
4244 | } | |
4245 | ||
4246 | if (arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) { | |
4247 | /* The child let us know the support cgroup mode it might have read from the image. */ | |
4248 | l = recv(unified_cgroup_hierarchy_socket_pair[0], &arg_unified_cgroup_hierarchy, sizeof(arg_unified_cgroup_hierarchy), 0); | |
4249 | if (l < 0) | |
4250 | return log_error_errno(errno, "Failed to read cgroup mode: %m"); | |
4251 | if (l != sizeof(arg_unified_cgroup_hierarchy)) | |
4252 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading cgroup mode (%zu bytes).%s", | |
4253 | l, l == 0 ? " The child is most likely dead." : ""); | |
4254 | } | |
4255 | ||
4256 | /* Wait for the outer child. */ | |
4257 | r = wait_for_terminate_and_check("(sd-namespace)", *pid, WAIT_LOG_ABNORMAL); | |
4258 | if (r < 0) | |
4259 | return r; | |
4260 | if (r != EXIT_SUCCESS) | |
4261 | return -EIO; | |
4262 | ||
4263 | /* And now retrieve the PID of the inner child. */ | |
4264 | l = recv(pid_socket_pair[0], pid, sizeof *pid, 0); | |
4265 | if (l < 0) | |
4266 | return log_error_errno(errno, "Failed to read inner child PID: %m"); | |
4267 | if (l != sizeof *pid) | |
4268 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading inner child PID."); | |
4269 | ||
4270 | /* We also retrieve container UUID in case it was generated by outer child */ | |
4271 | l = recv(uuid_socket_pair[0], &arg_uuid, sizeof arg_uuid, 0); | |
4272 | if (l < 0) | |
4273 | return log_error_errno(errno, "Failed to read container machine ID: %m"); | |
4274 | if (l != sizeof(arg_uuid)) | |
4275 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read while reading container machined ID."); | |
4276 | ||
4277 | /* We also retrieve the socket used for notifications generated by outer child */ | |
4278 | notify_socket = receive_one_fd(notify_socket_pair[0], 0); | |
4279 | if (notify_socket < 0) | |
4280 | return log_error_errno(notify_socket, | |
4281 | "Failed to receive notification socket from the outer child: %m"); | |
4282 | ||
4283 | log_debug("Init process invoked as PID "PID_FMT, *pid); | |
4284 | ||
4285 | if (arg_userns_mode != USER_NAMESPACE_NO) { | |
4286 | if (!barrier_place_and_sync(&barrier)) /* #1 */ | |
4287 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early."); | |
4288 | ||
4289 | r = setup_uid_map(*pid); | |
4290 | if (r < 0) | |
4291 | return r; | |
4292 | ||
4293 | (void) barrier_place(&barrier); /* #2 */ | |
4294 | } | |
4295 | ||
4296 | if (arg_private_network) { | |
4297 | if (!arg_network_namespace_path) { | |
4298 | /* Wait until the child has unshared its network namespace. */ | |
4299 | if (!barrier_place_and_sync(&barrier)) /* #3 */ | |
4300 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early"); | |
4301 | } | |
4302 | ||
4303 | r = move_network_interfaces(*pid, arg_network_interfaces); | |
4304 | if (r < 0) | |
4305 | return r; | |
4306 | ||
4307 | if (arg_network_veth) { | |
4308 | r = setup_veth(arg_machine, *pid, veth_name, | |
4309 | arg_network_bridge || arg_network_zone); | |
4310 | if (r < 0) | |
4311 | return r; | |
4312 | else if (r > 0) | |
4313 | ifi = r; | |
4314 | ||
4315 | if (arg_network_bridge) { | |
4316 | /* Add the interface to a bridge */ | |
4317 | r = setup_bridge(veth_name, arg_network_bridge, false); | |
4318 | if (r < 0) | |
4319 | return r; | |
4320 | if (r > 0) | |
4321 | ifi = r; | |
4322 | } else if (arg_network_zone) { | |
4323 | /* Add the interface to a bridge, possibly creating it */ | |
4324 | r = setup_bridge(veth_name, arg_network_zone, true); | |
4325 | if (r < 0) | |
4326 | return r; | |
4327 | if (r > 0) | |
4328 | ifi = r; | |
4329 | } | |
4330 | } | |
4331 | ||
4332 | r = setup_veth_extra(arg_machine, *pid, arg_network_veth_extra); | |
4333 | if (r < 0) | |
4334 | return r; | |
4335 | ||
4336 | /* We created the primary and extra veth links now; let's remember this, so that we know to | |
4337 | remove them later on. Note that we don't bother with removing veth links that were created | |
4338 | here when their setup failed half-way, because in that case the kernel should be able to | |
4339 | remove them on its own, since they cannot be referenced by anything yet. */ | |
4340 | *veth_created = true; | |
4341 | ||
4342 | r = setup_macvlan(arg_machine, *pid, arg_network_macvlan); | |
4343 | if (r < 0) | |
4344 | return r; | |
4345 | ||
4346 | r = setup_ipvlan(arg_machine, *pid, arg_network_ipvlan); | |
4347 | if (r < 0) | |
4348 | return r; | |
4349 | } | |
4350 | ||
4351 | if (arg_register || !arg_keep_unit) { | |
4352 | r = sd_bus_default_system(&bus); | |
4353 | if (r < 0) | |
4354 | return log_error_errno(r, "Failed to open system bus: %m"); | |
4355 | ||
4356 | r = sd_bus_set_close_on_exit(bus, false); | |
4357 | if (r < 0) | |
4358 | return log_error_errno(r, "Failed to disable close-on-exit behaviour: %m"); | |
4359 | } | |
4360 | ||
4361 | if (!arg_keep_unit) { | |
4362 | /* When a new scope is created for this container, then we'll be registered as its controller, in which | |
4363 | * case PID 1 will send us a friendly RequestStop signal, when it is asked to terminate the | |
4364 | * scope. Let's hook into that, and cleanly shut down the container, and print a friendly message. */ | |
4365 | ||
4366 | r = sd_bus_match_signal_async( | |
4367 | bus, | |
4368 | NULL, | |
4369 | "org.freedesktop.systemd1", | |
4370 | NULL, | |
4371 | "org.freedesktop.systemd1.Scope", | |
4372 | "RequestStop", | |
4373 | on_request_stop, NULL, PID_TO_PTR(*pid)); | |
4374 | if (r < 0) | |
4375 | return log_error_errno(r, "Failed to request RequestStop match: %m"); | |
4376 | } | |
4377 | ||
4378 | if (arg_register) { | |
4379 | r = register_machine( | |
4380 | bus, | |
4381 | arg_machine, | |
4382 | *pid, | |
4383 | arg_directory, | |
4384 | arg_uuid, | |
4385 | ifi, | |
4386 | arg_slice, | |
4387 | arg_custom_mounts, arg_n_custom_mounts, | |
4388 | arg_kill_signal, | |
4389 | arg_property, | |
4390 | arg_property_message, | |
4391 | arg_keep_unit, | |
4392 | arg_container_service_name); | |
4393 | if (r < 0) | |
4394 | return r; | |
4395 | ||
4396 | } else if (!arg_keep_unit) { | |
4397 | r = allocate_scope( | |
4398 | bus, | |
4399 | arg_machine, | |
4400 | *pid, | |
4401 | arg_slice, | |
4402 | arg_custom_mounts, arg_n_custom_mounts, | |
4403 | arg_kill_signal, | |
4404 | arg_property, | |
4405 | arg_property_message); | |
4406 | if (r < 0) | |
4407 | return r; | |
4408 | ||
4409 | } else if (arg_slice || arg_property) | |
4410 | log_notice("Machine and scope registration turned off, --slice= and --property= settings will have no effect."); | |
4411 | ||
4412 | r = create_subcgroup(*pid, arg_keep_unit, arg_unified_cgroup_hierarchy); | |
4413 | if (r < 0) | |
4414 | return r; | |
4415 | ||
4416 | r = sync_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift); | |
4417 | if (r < 0) | |
4418 | return r; | |
4419 | ||
4420 | r = chown_cgroup(*pid, arg_unified_cgroup_hierarchy, arg_uid_shift); | |
4421 | if (r < 0) | |
4422 | return r; | |
4423 | ||
4424 | /* Notify the child that the parent is ready with all | |
4425 | * its setup (including cgroup-ification), and that | |
4426 | * the child can now hand over control to the code to | |
4427 | * run inside the container. */ | |
4428 | (void) barrier_place(&barrier); /* #4 */ | |
4429 | ||
4430 | /* Block SIGCHLD here, before notifying child. | |
4431 | * process_pty() will handle it with the other signals. */ | |
4432 | assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0); | |
4433 | ||
4434 | /* Reset signal to default */ | |
4435 | r = default_signals(SIGCHLD, -1); | |
4436 | if (r < 0) | |
4437 | return log_error_errno(r, "Failed to reset SIGCHLD: %m"); | |
4438 | ||
4439 | r = sd_event_new(&event); | |
4440 | if (r < 0) | |
4441 | return log_error_errno(r, "Failed to get default event source: %m"); | |
4442 | ||
4443 | (void) sd_event_set_watchdog(event, true); | |
4444 | ||
4445 | if (bus) { | |
4446 | r = sd_bus_attach_event(bus, event, 0); | |
4447 | if (r < 0) | |
4448 | return log_error_errno(r, "Failed to attach bus to event loop: %m"); | |
4449 | } | |
4450 | ||
4451 | r = setup_sd_notify_parent(event, notify_socket, PID_TO_PTR(*pid), ¬ify_event_source); | |
4452 | if (r < 0) | |
4453 | return r; | |
4454 | ||
4455 | /* Let the child know that we are ready and wait that the child is completely ready now. */ | |
4456 | if (!barrier_place_and_sync(&barrier)) /* #5 */ | |
4457 | return log_error_errno(SYNTHETIC_ERRNO(ESRCH), "Child died too early."); | |
4458 | ||
4459 | /* At this point we have made use of the UID we picked, and thus nss-mymachines | |
4460 | * will make them appear in getpwuid(), thus we can release the /etc/passwd lock. */ | |
4461 | etc_passwd_lock = safe_close(etc_passwd_lock); | |
4462 | ||
4463 | (void) sd_notifyf(false, | |
4464 | "STATUS=Container running.\n" | |
4465 | "X_NSPAWN_LEADER_PID=" PID_FMT, *pid); | |
4466 | if (!arg_notify_ready) | |
4467 | (void) sd_notify(false, "READY=1\n"); | |
4468 | ||
4469 | if (arg_kill_signal > 0) { | |
4470 | /* Try to kill the init system on SIGINT or SIGTERM */ | |
4471 | (void) sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, PID_TO_PTR(*pid)); | |
4472 | (void) sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, PID_TO_PTR(*pid)); | |
4473 | } else { | |
4474 | /* Immediately exit */ | |
4475 | (void) sd_event_add_signal(event, NULL, SIGINT, NULL, NULL); | |
4476 | (void) sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL); | |
4477 | } | |
4478 | ||
4479 | /* Exit when the child exits */ | |
4480 | (void) sd_event_add_signal(event, NULL, SIGCHLD, on_sigchld, PID_TO_PTR(*pid)); | |
4481 | ||
4482 | if (arg_expose_ports) { | |
4483 | r = expose_port_watch_rtnl(event, rtnl_socket_pair[0], on_address_change, exposed, &rtnl); | |
4484 | if (r < 0) | |
4485 | return r; | |
4486 | ||
4487 | (void) expose_port_execute(rtnl, arg_expose_ports, exposed); | |
4488 | } | |
4489 | ||
4490 | rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]); | |
4491 | ||
4492 | if (arg_console_mode != CONSOLE_PIPE) { | |
4493 | _cleanup_close_ int fd = -1; | |
4494 | PTYForwardFlags flags = 0; | |
4495 | ||
4496 | /* Retrieve the master pty allocated by inner child */ | |
4497 | fd = receive_one_fd(master_pty_socket_pair[0], 0); | |
4498 | if (fd < 0) | |
4499 | return log_error_errno(fd, "Failed to receive master pty from the inner child: %m"); | |
4500 | ||
4501 | switch (arg_console_mode) { | |
4502 | ||
4503 | case CONSOLE_READ_ONLY: | |
4504 | flags |= PTY_FORWARD_READ_ONLY; | |
4505 | ||
4506 | _fallthrough_; | |
4507 | ||
4508 | case CONSOLE_INTERACTIVE: | |
4509 | flags |= PTY_FORWARD_IGNORE_VHANGUP; | |
4510 | ||
4511 | r = pty_forward_new(event, fd, flags, &forward); | |
4512 | if (r < 0) | |
4513 | return log_error_errno(r, "Failed to create PTY forwarder: %m"); | |
4514 | ||
4515 | if (arg_console_width != (unsigned) -1 || arg_console_height != (unsigned) -1) | |
4516 | (void) pty_forward_set_width_height(forward, | |
4517 | arg_console_width, | |
4518 | arg_console_height); | |
4519 | break; | |
4520 | ||
4521 | default: | |
4522 | assert(arg_console_mode == CONSOLE_PASSIVE); | |
4523 | } | |
4524 | ||
4525 | *master = TAKE_FD(fd); | |
4526 | } | |
4527 | ||
4528 | r = sd_event_loop(event); | |
4529 | if (r < 0) | |
4530 | return log_error_errno(r, "Failed to run event loop: %m"); | |
4531 | ||
4532 | if (forward) { | |
4533 | char last_char = 0; | |
4534 | ||
4535 | (void) pty_forward_get_last_char(forward, &last_char); | |
4536 | forward = pty_forward_free(forward); | |
4537 | ||
4538 | if (!arg_quiet && last_char != '\n') | |
4539 | putc('\n', stdout); | |
4540 | } | |
4541 | ||
4542 | /* Kill if it is not dead yet anyway */ | |
4543 | if (bus) { | |
4544 | if (arg_register) | |
4545 | terminate_machine(bus, arg_machine); | |
4546 | else if (!arg_keep_unit) | |
4547 | terminate_scope(bus, arg_machine); | |
4548 | } | |
4549 | ||
4550 | /* Normally redundant, but better safe than sorry */ | |
4551 | (void) kill(*pid, SIGKILL); | |
4552 | ||
4553 | r = wait_for_container(*pid, &container_status); | |
4554 | *pid = 0; | |
4555 | ||
4556 | if (r < 0) | |
4557 | /* We failed to wait for the container, or the container exited abnormally. */ | |
4558 | return r; | |
4559 | if (r > 0 || container_status == CONTAINER_TERMINATED) { | |
4560 | /* r > 0 → The container exited with a non-zero status. | |
4561 | * As a special case, we need to replace 133 with a different value, | |
4562 | * because 133 is special-cased in the service file to reboot the container. | |
4563 | * otherwise → The container exited with zero status and a reboot was not requested. | |
4564 | */ | |
4565 | if (r == EXIT_FORCE_RESTART) | |
4566 | r = EXIT_FAILURE; /* replace 133 with the general failure code */ | |
4567 | *ret = r; | |
4568 | return 0; /* finito */ | |
4569 | } | |
4570 | ||
4571 | /* CONTAINER_REBOOTED, loop again */ | |
4572 | ||
4573 | if (arg_keep_unit) { | |
4574 | /* Special handling if we are running as a service: instead of simply | |
4575 | * restarting the machine we want to restart the entire service, so let's | |
4576 | * inform systemd about this with the special exit code 133. The service | |
4577 | * file uses RestartForceExitStatus=133 so that this results in a full | |
4578 | * nspawn restart. This is necessary since we might have cgroup parameters | |
4579 | * set we want to have flushed out. */ | |
4580 | *ret = EXIT_FORCE_RESTART; | |
4581 | return 0; /* finito */ | |
4582 | } | |
4583 | ||
4584 | expose_port_flush(arg_expose_ports, exposed); | |
4585 | ||
4586 | (void) remove_veth_links(veth_name, arg_network_veth_extra); | |
4587 | *veth_created = false; | |
4588 | return 1; /* loop again */ | |
4589 | } | |
4590 | ||
4591 | static int initialize_rlimits(void) { | |
4592 | /* The default resource limits the kernel passes to PID 1, as per kernel 4.16. Let's pass our container payload | |
4593 | * the same values as the kernel originally passed to PID 1, in order to minimize differences between host and | |
4594 | * container execution environments. */ | |
4595 | ||
4596 | static const struct rlimit kernel_defaults[_RLIMIT_MAX] = { | |
4597 | [RLIMIT_AS] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4598 | [RLIMIT_CORE] = { 0, RLIM_INFINITY }, | |
4599 | [RLIMIT_CPU] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4600 | [RLIMIT_DATA] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4601 | [RLIMIT_FSIZE] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4602 | [RLIMIT_LOCKS] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4603 | [RLIMIT_MEMLOCK] = { 65536, 65536 }, | |
4604 | [RLIMIT_MSGQUEUE] = { 819200, 819200 }, | |
4605 | [RLIMIT_NICE] = { 0, 0 }, | |
4606 | [RLIMIT_NOFILE] = { 1024, 4096 }, | |
4607 | [RLIMIT_RSS] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4608 | [RLIMIT_RTPRIO] = { 0, 0 }, | |
4609 | [RLIMIT_RTTIME] = { RLIM_INFINITY, RLIM_INFINITY }, | |
4610 | [RLIMIT_STACK] = { 8388608, RLIM_INFINITY }, | |
4611 | ||
4612 | /* The kernel scales the default for RLIMIT_NPROC and RLIMIT_SIGPENDING based on the system's amount of | |
4613 | * RAM. To provide best compatibility we'll read these limits off PID 1 instead of hardcoding them | |
4614 | * here. This is safe as we know that PID 1 doesn't change these two limits and thus the original | |
4615 | * kernel's initialization should still be valid during runtime — at least if PID 1 is systemd. Note | |
4616 | * that PID 1 changes a number of other resource limits during early initialization which is why we | |
4617 | * don't read the other limits from PID 1 but prefer the static table above. */ | |
4618 | }; | |
4619 | ||
4620 | int rl; | |
4621 | ||
4622 | for (rl = 0; rl < _RLIMIT_MAX; rl++) { | |
4623 | /* Let's only fill in what the user hasn't explicitly configured anyway */ | |
4624 | if ((arg_settings_mask & (SETTING_RLIMIT_FIRST << rl)) == 0) { | |
4625 | const struct rlimit *v; | |
4626 | struct rlimit buffer; | |
4627 | ||
4628 | if (IN_SET(rl, RLIMIT_NPROC, RLIMIT_SIGPENDING)) { | |
4629 | /* For these two let's read the limits off PID 1. See above for an explanation. */ | |
4630 | ||
4631 | if (prlimit(1, rl, NULL, &buffer) < 0) | |
4632 | return log_error_errno(errno, "Failed to read resource limit RLIMIT_%s of PID 1: %m", rlimit_to_string(rl)); | |
4633 | ||
4634 | v = &buffer; | |
4635 | } else | |
4636 | v = kernel_defaults + rl; | |
4637 | ||
4638 | arg_rlimit[rl] = newdup(struct rlimit, v, 1); | |
4639 | if (!arg_rlimit[rl]) | |
4640 | return log_oom(); | |
4641 | } | |
4642 | ||
4643 | if (DEBUG_LOGGING) { | |
4644 | _cleanup_free_ char *k = NULL; | |
4645 | ||
4646 | (void) rlimit_format(arg_rlimit[rl], &k); | |
4647 | log_debug("Setting RLIMIT_%s to %s.", rlimit_to_string(rl), k); | |
4648 | } | |
4649 | } | |
4650 | ||
4651 | return 0; | |
4652 | } | |
4653 | ||
4654 | static int run(int argc, char *argv[]) { | |
4655 | _cleanup_close_ int master = -1; | |
4656 | _cleanup_fdset_free_ FDSet *fds = NULL; | |
4657 | int r, n_fd_passed, ret = EXIT_SUCCESS; | |
4658 | char veth_name[IFNAMSIZ] = ""; | |
4659 | bool secondary = false, remove_directory = false, remove_image = false; | |
4660 | pid_t pid = 0; | |
4661 | union in_addr_union exposed = {}; | |
4662 | _cleanup_(release_lock_file) LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT; | |
4663 | bool veth_created = false, remove_tmprootdir = false; | |
4664 | char tmprootdir[] = "/tmp/nspawn-root-XXXXXX"; | |
4665 | _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL; | |
4666 | _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; | |
4667 | _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; | |
4668 | ||
4669 | log_parse_environment(); | |
4670 | log_open(); | |
4671 | ||
4672 | r = parse_argv(argc, argv); | |
4673 | if (r <= 0) | |
4674 | goto finish; | |
4675 | ||
4676 | r = must_be_root(); | |
4677 | if (r < 0) | |
4678 | goto finish; | |
4679 | ||
4680 | r = initialize_rlimits(); | |
4681 | if (r < 0) | |
4682 | goto finish; | |
4683 | ||
4684 | r = load_oci_bundle(); | |
4685 | if (r < 0) | |
4686 | goto finish; | |
4687 | ||
4688 | r = determine_names(); | |
4689 | if (r < 0) | |
4690 | goto finish; | |
4691 | ||
4692 | r = load_settings(); | |
4693 | if (r < 0) | |
4694 | goto finish; | |
4695 | ||
4696 | r = cg_unified_flush(); | |
4697 | if (r < 0) { | |
4698 | log_error_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m"); | |
4699 | goto finish; | |
4700 | } | |
4701 | ||
4702 | r = verify_arguments(); | |
4703 | if (r < 0) | |
4704 | goto finish; | |
4705 | ||
4706 | r = detect_unified_cgroup_hierarchy_from_environment(); | |
4707 | if (r < 0) | |
4708 | goto finish; | |
4709 | ||
4710 | /* Ignore SIGPIPE here, because we use splice() on the ptyfwd stuff and that will generate SIGPIPE if | |
4711 | * the result is closed. Note that the container payload child will reset signal mask+handler anyway, | |
4712 | * so just turning this off here means we only turn it off in nspawn itself, not any children. */ | |
4713 | (void) ignore_signals(SIGPIPE, -1); | |
4714 | ||
4715 | n_fd_passed = sd_listen_fds(false); | |
4716 | if (n_fd_passed > 0) { | |
4717 | r = fdset_new_listen_fds(&fds, false); | |
4718 | if (r < 0) { | |
4719 | log_error_errno(r, "Failed to collect file descriptors: %m"); | |
4720 | goto finish; | |
4721 | } | |
4722 | } | |
4723 | ||
4724 | /* The "default" umask. This is appropriate for most file and directory | |
4725 | * operations performed by nspawn, and is the umask that will be used for | |
4726 | * the child. Functions like copy_devnodes() change the umask temporarily. */ | |
4727 | umask(0022); | |
4728 | ||
4729 | if (arg_directory) { | |
4730 | assert(!arg_image); | |
4731 | ||
4732 | if (path_equal(arg_directory, "/") && !arg_ephemeral) { | |
4733 | log_error("Spawning container on root directory is not supported. Consider using --ephemeral."); | |
4734 | r = -EINVAL; | |
4735 | goto finish; | |
4736 | } | |
4737 | ||
4738 | if (arg_ephemeral) { | |
4739 | _cleanup_free_ char *np = NULL; | |
4740 | ||
4741 | r = chase_symlinks_and_update(&arg_directory, 0); | |
4742 | if (r < 0) | |
4743 | goto finish; | |
4744 | ||
4745 | /* If the specified path is a mount point we | |
4746 | * generate the new snapshot immediately | |
4747 | * inside it under a random name. However if | |
4748 | * the specified is not a mount point we | |
4749 | * create the new snapshot in the parent | |
4750 | * directory, just next to it. */ | |
4751 | r = path_is_mount_point(arg_directory, NULL, 0); | |
4752 | if (r < 0) { | |
4753 | log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory); | |
4754 | goto finish; | |
4755 | } | |
4756 | if (r > 0) | |
4757 | r = tempfn_random_child(arg_directory, "machine.", &np); | |
4758 | else | |
4759 | r = tempfn_random(arg_directory, "machine.", &np); | |
4760 | if (r < 0) { | |
4761 | log_error_errno(r, "Failed to generate name for directory snapshot: %m"); | |
4762 | goto finish; | |
4763 | } | |
4764 | ||
4765 | r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock); | |
4766 | if (r < 0) { | |
4767 | log_error_errno(r, "Failed to lock %s: %m", np); | |
4768 | goto finish; | |
4769 | } | |
4770 | ||
4771 | r = btrfs_subvol_snapshot(arg_directory, np, | |
4772 | (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
4773 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
4774 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
4775 | BTRFS_SNAPSHOT_RECURSIVE | | |
4776 | BTRFS_SNAPSHOT_QUOTA); | |
4777 | if (r < 0) { | |
4778 | log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory); | |
4779 | goto finish; | |
4780 | } | |
4781 | ||
4782 | free_and_replace(arg_directory, np); | |
4783 | ||
4784 | remove_directory = true; | |
4785 | ||
4786 | } else { | |
4787 | r = chase_symlinks_and_update(&arg_directory, arg_template ? CHASE_NONEXISTENT : 0); | |
4788 | if (r < 0) | |
4789 | goto finish; | |
4790 | ||
4791 | r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock); | |
4792 | if (r == -EBUSY) { | |
4793 | log_error_errno(r, "Directory tree %s is currently busy.", arg_directory); | |
4794 | goto finish; | |
4795 | } | |
4796 | if (r < 0) { | |
4797 | log_error_errno(r, "Failed to lock %s: %m", arg_directory); | |
4798 | goto finish; | |
4799 | } | |
4800 | ||
4801 | if (arg_template) { | |
4802 | r = chase_symlinks_and_update(&arg_template, 0); | |
4803 | if (r < 0) | |
4804 | goto finish; | |
4805 | ||
4806 | r = btrfs_subvol_snapshot(arg_template, arg_directory, | |
4807 | (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | | |
4808 | BTRFS_SNAPSHOT_FALLBACK_COPY | | |
4809 | BTRFS_SNAPSHOT_FALLBACK_DIRECTORY | | |
4810 | BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE | | |
4811 | BTRFS_SNAPSHOT_RECURSIVE | | |
4812 | BTRFS_SNAPSHOT_QUOTA); | |
4813 | if (r == -EEXIST) | |
4814 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, | |
4815 | "Directory %s already exists, not populating from template %s.", arg_directory, arg_template); | |
4816 | else if (r < 0) { | |
4817 | log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template); | |
4818 | goto finish; | |
4819 | } else | |
4820 | log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, | |
4821 | "Populated %s from template %s.", arg_directory, arg_template); | |
4822 | } | |
4823 | } | |
4824 | ||
4825 | if (arg_start_mode == START_BOOT) { | |
4826 | const char *p; | |
4827 | ||
4828 | if (arg_pivot_root_new) | |
4829 | p = prefix_roota(arg_directory, arg_pivot_root_new); | |
4830 | else | |
4831 | p = arg_directory; | |
4832 | ||
4833 | if (path_is_os_tree(p) <= 0) { | |
4834 | log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", p); | |
4835 | r = -EINVAL; | |
4836 | goto finish; | |
4837 | } | |
4838 | } else { | |
4839 | const char *p, *q; | |
4840 | ||
4841 | if (arg_pivot_root_new) | |
4842 | p = prefix_roota(arg_directory, arg_pivot_root_new); | |
4843 | else | |
4844 | p = arg_directory; | |
4845 | ||
4846 | q = strjoina(p, "/usr/"); | |
4847 | ||
4848 | if (laccess(q, F_OK) < 0) { | |
4849 | log_error("Directory %s doesn't look like it has an OS tree. Refusing.", p); | |
4850 | r = -EINVAL; | |
4851 | goto finish; | |
4852 | } | |
4853 | } | |
4854 | ||
4855 | } else { | |
4856 | assert(arg_image); | |
4857 | assert(!arg_template); | |
4858 | ||
4859 | r = chase_symlinks_and_update(&arg_image, 0); | |
4860 | if (r < 0) | |
4861 | goto finish; | |
4862 | ||
4863 | if (arg_ephemeral) { | |
4864 | _cleanup_free_ char *np = NULL; | |
4865 | ||
4866 | r = tempfn_random(arg_image, "machine.", &np); | |
4867 | if (r < 0) { | |
4868 | log_error_errno(r, "Failed to generate name for image snapshot: %m"); | |
4869 | goto finish; | |
4870 | } | |
4871 | ||
4872 | r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock); | |
4873 | if (r < 0) { | |
4874 | r = log_error_errno(r, "Failed to create image lock: %m"); | |
4875 | goto finish; | |
4876 | } | |
4877 | ||
4878 | r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL, FS_NOCOW_FL, COPY_REFLINK|COPY_CRTIME); | |
4879 | if (r < 0) { | |
4880 | r = log_error_errno(r, "Failed to copy image file: %m"); | |
4881 | goto finish; | |
4882 | } | |
4883 | ||
4884 | free_and_replace(arg_image, np); | |
4885 | ||
4886 | remove_image = true; | |
4887 | } else { | |
4888 | r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock); | |
4889 | if (r == -EBUSY) { | |
4890 | r = log_error_errno(r, "Disk image %s is currently busy.", arg_image); | |
4891 | goto finish; | |
4892 | } | |
4893 | if (r < 0) { | |
4894 | r = log_error_errno(r, "Failed to create image lock: %m"); | |
4895 | goto finish; | |
4896 | } | |
4897 | ||
4898 | if (!arg_root_hash) { | |
4899 | r = root_hash_load(arg_image, &arg_root_hash, &arg_root_hash_size); | |
4900 | if (r < 0) { | |
4901 | log_error_errno(r, "Failed to load root hash file for %s: %m", arg_image); | |
4902 | goto finish; | |
4903 | } | |
4904 | } | |
4905 | } | |
4906 | ||
4907 | if (!mkdtemp(tmprootdir)) { | |
4908 | r = log_error_errno(errno, "Failed to create temporary directory: %m"); | |
4909 | goto finish; | |
4910 | } | |
4911 | ||
4912 | remove_tmprootdir = true; | |
4913 | ||
4914 | arg_directory = strdup(tmprootdir); | |
4915 | if (!arg_directory) { | |
4916 | r = log_oom(); | |
4917 | goto finish; | |
4918 | } | |
4919 | ||
4920 | r = loop_device_make_by_path(arg_image, arg_read_only ? O_RDONLY : O_RDWR, &loop); | |
4921 | if (r < 0) { | |
4922 | log_error_errno(r, "Failed to set up loopback block device: %m"); | |
4923 | goto finish; | |
4924 | } | |
4925 | ||
4926 | r = dissect_image_and_warn( | |
4927 | loop->fd, | |
4928 | arg_image, | |
4929 | arg_root_hash, arg_root_hash_size, | |
4930 | DISSECT_IMAGE_REQUIRE_ROOT, | |
4931 | &dissected_image); | |
4932 | if (r == -ENOPKG) { | |
4933 | /* dissected_image_and_warn() already printed a brief error message. Extend on that with more details */ | |
4934 | log_notice("Note that the disk image needs to\n" | |
4935 | " a) either contain only a single MBR partition of type 0x83 that is marked bootable\n" | |
4936 | " b) or contain a single GPT partition of type 0FC63DAF-8483-4772-8E79-3D69D8477DE4\n" | |
4937 | " c) or follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n" | |
4938 | " d) or contain a file system without a partition table\n" | |
4939 | "in order to be bootable with systemd-nspawn."); | |
4940 | goto finish; | |
4941 | } | |
4942 | if (r < 0) | |
4943 | goto finish; | |
4944 | ||
4945 | if (!arg_root_hash && dissected_image->can_verity) | |
4946 | log_notice("Note: image %s contains verity information, but no root hash specified! Proceeding without integrity checking.", arg_image); | |
4947 | ||
4948 | r = dissected_image_decrypt_interactively(dissected_image, NULL, arg_root_hash, arg_root_hash_size, 0, &decrypted_image); | |
4949 | if (r < 0) | |
4950 | goto finish; | |
4951 | ||
4952 | /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */ | |
4953 | if (remove_image && unlink(arg_image) >= 0) | |
4954 | remove_image = false; | |
4955 | } | |
4956 | ||
4957 | r = custom_mount_prepare_all(arg_directory, arg_custom_mounts, arg_n_custom_mounts); | |
4958 | if (r < 0) | |
4959 | goto finish; | |
4960 | ||
4961 | if (arg_console_mode < 0) | |
4962 | arg_console_mode = | |
4963 | isatty(STDIN_FILENO) > 0 && | |
4964 | isatty(STDOUT_FILENO) > 0 ? CONSOLE_INTERACTIVE : CONSOLE_READ_ONLY; | |
4965 | ||
4966 | if (arg_console_mode == CONSOLE_PIPE) /* if we pass STDERR on to the container, don't add our own logs into it too */ | |
4967 | arg_quiet = true; | |
4968 | ||
4969 | if (!arg_quiet) | |
4970 | log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.", | |
4971 | arg_machine, arg_image ?: arg_directory); | |
4972 | ||
4973 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0); | |
4974 | ||
4975 | if (prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0) < 0) { | |
4976 | r = log_error_errno(errno, "Failed to become subreaper: %m"); | |
4977 | goto finish; | |
4978 | } | |
4979 | ||
4980 | for (;;) { | |
4981 | r = run_container(dissected_image, | |
4982 | secondary, | |
4983 | fds, | |
4984 | veth_name, &veth_created, | |
4985 | &exposed, &master, | |
4986 | &pid, &ret); | |
4987 | if (r <= 0) | |
4988 | break; | |
4989 | } | |
4990 | ||
4991 | finish: | |
4992 | (void) sd_notify(false, | |
4993 | r == 0 && ret == EXIT_FORCE_RESTART ? "STOPPING=1\nSTATUS=Restarting..." : | |
4994 | "STOPPING=1\nSTATUS=Terminating..."); | |
4995 | ||
4996 | if (pid > 0) | |
4997 | (void) kill(pid, SIGKILL); | |
4998 | ||
4999 | /* Try to flush whatever is still queued in the pty */ | |
5000 | if (master >= 0) { | |
5001 | (void) copy_bytes(master, STDOUT_FILENO, (uint64_t) -1, 0); | |
5002 | master = safe_close(master); | |
5003 | } | |
5004 | ||
5005 | if (pid > 0) | |
5006 | (void) wait_for_terminate(pid, NULL); | |
5007 | ||
5008 | pager_close(); | |
5009 | ||
5010 | if (remove_directory && arg_directory) { | |
5011 | int k; | |
5012 | ||
5013 | k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
5014 | if (k < 0) | |
5015 | log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory); | |
5016 | } | |
5017 | ||
5018 | if (remove_image && arg_image) { | |
5019 | if (unlink(arg_image) < 0) | |
5020 | log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image); | |
5021 | } | |
5022 | ||
5023 | if (remove_tmprootdir) { | |
5024 | if (rmdir(tmprootdir) < 0) | |
5025 | log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir); | |
5026 | } | |
5027 | ||
5028 | if (arg_machine) { | |
5029 | const char *p; | |
5030 | ||
5031 | p = strjoina("/run/systemd/nspawn/propagate/", arg_machine); | |
5032 | (void) rm_rf(p, REMOVE_ROOT); | |
5033 | } | |
5034 | ||
5035 | expose_port_flush(arg_expose_ports, &exposed); | |
5036 | ||
5037 | if (veth_created) | |
5038 | (void) remove_veth_links(veth_name, arg_network_veth_extra); | |
5039 | (void) remove_bridge(arg_network_zone); | |
5040 | ||
5041 | custom_mount_free_all(arg_custom_mounts, arg_n_custom_mounts); | |
5042 | expose_port_free_all(arg_expose_ports); | |
5043 | rlimit_free_all(arg_rlimit); | |
5044 | device_node_array_free(arg_extra_nodes, arg_n_extra_nodes); | |
5045 | ||
5046 | if (r < 0) | |
5047 | return r; | |
5048 | ||
5049 | return ret; | |
5050 | } | |
5051 | ||
5052 | DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run); |