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Merge pull request #539 from poettering/tmpfiles-journal-acl
[thirdparty/systemd.git] / src / nspawn / nspawn.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <signal.h>
23 #include <sched.h>
24 #include <unistd.h>
25 #include <sys/types.h>
26 #include <sys/mount.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdio.h>
30 #include <errno.h>
31 #include <sys/prctl.h>
32 #include <getopt.h>
33 #include <grp.h>
34 #include <linux/fs.h>
35 #include <sys/socket.h>
36 #include <linux/netlink.h>
37 #include <net/if.h>
38 #include <linux/veth.h>
39 #include <sys/personality.h>
40 #include <linux/loop.h>
41 #include <sys/file.h>
42
43 #ifdef HAVE_SELINUX
44 #include <selinux/selinux.h>
45 #endif
46
47 #ifdef HAVE_SECCOMP
48 #include <seccomp.h>
49 #endif
50
51 #ifdef HAVE_BLKID
52 #include <blkid/blkid.h>
53 #endif
54
55 #include "sd-daemon.h"
56 #include "sd-bus.h"
57 #include "sd-id128.h"
58 #include "sd-netlink.h"
59 #include "random-util.h"
60 #include "log.h"
61 #include "util.h"
62 #include "mkdir.h"
63 #include "rm-rf.h"
64 #include "macro.h"
65 #include "missing.h"
66 #include "cgroup-util.h"
67 #include "strv.h"
68 #include "path-util.h"
69 #include "loopback-setup.h"
70 #include "dev-setup.h"
71 #include "fdset.h"
72 #include "build.h"
73 #include "fileio.h"
74 #include "bus-util.h"
75 #include "bus-error.h"
76 #include "ptyfwd.h"
77 #include "env-util.h"
78 #include "netlink-util.h"
79 #include "udev-util.h"
80 #include "blkid-util.h"
81 #include "gpt.h"
82 #include "siphash24.h"
83 #include "copy.h"
84 #include "base-filesystem.h"
85 #include "barrier.h"
86 #include "event-util.h"
87 #include "capability.h"
88 #include "cap-list.h"
89 #include "btrfs-util.h"
90 #include "machine-image.h"
91 #include "list.h"
92 #include "in-addr-util.h"
93 #include "firewall-util.h"
94 #include "local-addresses.h"
95 #include "formats-util.h"
96 #include "process-util.h"
97 #include "terminal-util.h"
98 #include "hostname-util.h"
99 #include "signal-util.h"
100
101 #ifdef HAVE_SECCOMP
102 #include "seccomp-util.h"
103 #endif
104
105 typedef struct ExposePort {
106 int protocol;
107 uint16_t host_port;
108 uint16_t container_port;
109 LIST_FIELDS(struct ExposePort, ports);
110 } ExposePort;
111
112 typedef enum ContainerStatus {
113 CONTAINER_TERMINATED,
114 CONTAINER_REBOOTED
115 } ContainerStatus;
116
117 typedef enum LinkJournal {
118 LINK_NO,
119 LINK_AUTO,
120 LINK_HOST,
121 LINK_GUEST
122 } LinkJournal;
123
124 typedef enum Volatile {
125 VOLATILE_NO,
126 VOLATILE_YES,
127 VOLATILE_STATE,
128 } Volatile;
129
130 typedef enum CustomMountType {
131 CUSTOM_MOUNT_BIND,
132 CUSTOM_MOUNT_TMPFS,
133 CUSTOM_MOUNT_OVERLAY,
134 } CustomMountType;
135
136 typedef struct CustomMount {
137 CustomMountType type;
138 bool read_only;
139 char *source; /* for overlayfs this is the upper directory */
140 char *destination;
141 char *options;
142 char *work_dir;
143 char **lower;
144 } CustomMount;
145
146 static char *arg_directory = NULL;
147 static char *arg_template = NULL;
148 static char *arg_user = NULL;
149 static sd_id128_t arg_uuid = {};
150 static char *arg_machine = NULL;
151 static const char *arg_selinux_context = NULL;
152 static const char *arg_selinux_apifs_context = NULL;
153 static const char *arg_slice = NULL;
154 static bool arg_private_network = false;
155 static bool arg_read_only = false;
156 static bool arg_boot = false;
157 static bool arg_ephemeral = false;
158 static LinkJournal arg_link_journal = LINK_AUTO;
159 static bool arg_link_journal_try = false;
160 static uint64_t arg_retain =
161 (1ULL << CAP_CHOWN) |
162 (1ULL << CAP_DAC_OVERRIDE) |
163 (1ULL << CAP_DAC_READ_SEARCH) |
164 (1ULL << CAP_FOWNER) |
165 (1ULL << CAP_FSETID) |
166 (1ULL << CAP_IPC_OWNER) |
167 (1ULL << CAP_KILL) |
168 (1ULL << CAP_LEASE) |
169 (1ULL << CAP_LINUX_IMMUTABLE) |
170 (1ULL << CAP_NET_BIND_SERVICE) |
171 (1ULL << CAP_NET_BROADCAST) |
172 (1ULL << CAP_NET_RAW) |
173 (1ULL << CAP_SETGID) |
174 (1ULL << CAP_SETFCAP) |
175 (1ULL << CAP_SETPCAP) |
176 (1ULL << CAP_SETUID) |
177 (1ULL << CAP_SYS_ADMIN) |
178 (1ULL << CAP_SYS_CHROOT) |
179 (1ULL << CAP_SYS_NICE) |
180 (1ULL << CAP_SYS_PTRACE) |
181 (1ULL << CAP_SYS_TTY_CONFIG) |
182 (1ULL << CAP_SYS_RESOURCE) |
183 (1ULL << CAP_SYS_BOOT) |
184 (1ULL << CAP_AUDIT_WRITE) |
185 (1ULL << CAP_AUDIT_CONTROL) |
186 (1ULL << CAP_MKNOD);
187 static CustomMount *arg_custom_mounts = NULL;
188 static unsigned arg_n_custom_mounts = 0;
189 static char **arg_setenv = NULL;
190 static bool arg_quiet = false;
191 static bool arg_share_system = false;
192 static bool arg_register = true;
193 static bool arg_keep_unit = false;
194 static char **arg_network_interfaces = NULL;
195 static char **arg_network_macvlan = NULL;
196 static char **arg_network_ipvlan = NULL;
197 static bool arg_network_veth = false;
198 static const char *arg_network_bridge = NULL;
199 static unsigned long arg_personality = PERSONALITY_INVALID;
200 static char *arg_image = NULL;
201 static Volatile arg_volatile = VOLATILE_NO;
202 static ExposePort *arg_expose_ports = NULL;
203 static char **arg_property = NULL;
204 static uid_t arg_uid_shift = UID_INVALID, arg_uid_range = 0x10000U;
205 static bool arg_userns = false;
206 static int arg_kill_signal = 0;
207
208 static void help(void) {
209 printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
210 "Spawn a minimal namespace container for debugging, testing and building.\n\n"
211 " -h --help Show this help\n"
212 " --version Print version string\n"
213 " -q --quiet Do not show status information\n"
214 " -D --directory=PATH Root directory for the container\n"
215 " --template=PATH Initialize root directory from template directory,\n"
216 " if missing\n"
217 " -x --ephemeral Run container with snapshot of root directory, and\n"
218 " remove it after exit\n"
219 " -i --image=PATH File system device or disk image for the container\n"
220 " -b --boot Boot up full system (i.e. invoke init)\n"
221 " -u --user=USER Run the command under specified user or uid\n"
222 " -M --machine=NAME Set the machine name for the container\n"
223 " --uuid=UUID Set a specific machine UUID for the container\n"
224 " -S --slice=SLICE Place the container in the specified slice\n"
225 " --property=NAME=VALUE Set scope unit property\n"
226 " --private-users[=UIDBASE[:NUIDS]]\n"
227 " Run within user namespace\n"
228 " --private-network Disable network in container\n"
229 " --network-interface=INTERFACE\n"
230 " Assign an existing network interface to the\n"
231 " container\n"
232 " --network-macvlan=INTERFACE\n"
233 " Create a macvlan network interface based on an\n"
234 " existing network interface to the container\n"
235 " --network-ipvlan=INTERFACE\n"
236 " Create a ipvlan network interface based on an\n"
237 " existing network interface to the container\n"
238 " -n --network-veth Add a virtual ethernet connection between host\n"
239 " and container\n"
240 " --network-bridge=INTERFACE\n"
241 " Add a virtual ethernet connection between host\n"
242 " and container and add it to an existing bridge on\n"
243 " the host\n"
244 " -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
245 " Expose a container IP port on the host\n"
246 " -Z --selinux-context=SECLABEL\n"
247 " Set the SELinux security context to be used by\n"
248 " processes in the container\n"
249 " -L --selinux-apifs-context=SECLABEL\n"
250 " Set the SELinux security context to be used by\n"
251 " API/tmpfs file systems in the container\n"
252 " --capability=CAP In addition to the default, retain specified\n"
253 " capability\n"
254 " --drop-capability=CAP Drop the specified capability from the default set\n"
255 " --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
256 " --link-journal=MODE Link up guest journal, one of no, auto, guest, host,\n"
257 " try-guest, try-host\n"
258 " -j Equivalent to --link-journal=try-guest\n"
259 " --read-only Mount the root directory read-only\n"
260 " --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
261 " the container\n"
262 " --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
263 " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
264 " --overlay=PATH[:PATH...]:PATH\n"
265 " Create an overlay mount from the host to \n"
266 " the container\n"
267 " --overlay-ro=PATH[:PATH...]:PATH\n"
268 " Similar, but creates a read-only overlay mount\n"
269 " --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
270 " --share-system Share system namespaces with host\n"
271 " --register=BOOLEAN Register container as machine\n"
272 " --keep-unit Do not register a scope for the machine, reuse\n"
273 " the service unit nspawn is running in\n"
274 " --volatile[=MODE] Run the system in volatile mode\n"
275 , program_invocation_short_name);
276 }
277
278 static CustomMount* custom_mount_add(CustomMountType t) {
279 CustomMount *c, *ret;
280
281 c = realloc(arg_custom_mounts, (arg_n_custom_mounts + 1) * sizeof(CustomMount));
282 if (!c)
283 return NULL;
284
285 arg_custom_mounts = c;
286 ret = arg_custom_mounts + arg_n_custom_mounts;
287 arg_n_custom_mounts++;
288
289 *ret = (CustomMount) { .type = t };
290
291 return ret;
292 }
293
294 static void custom_mount_free_all(void) {
295 unsigned i;
296
297 for (i = 0; i < arg_n_custom_mounts; i++) {
298 CustomMount *m = &arg_custom_mounts[i];
299
300 free(m->source);
301 free(m->destination);
302 free(m->options);
303
304 if (m->work_dir) {
305 (void) rm_rf(m->work_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
306 free(m->work_dir);
307 }
308
309 strv_free(m->lower);
310 }
311
312 free(arg_custom_mounts);
313 arg_custom_mounts = NULL;
314 arg_n_custom_mounts = 0;
315 }
316
317 static int custom_mount_compare(const void *a, const void *b) {
318 const CustomMount *x = a, *y = b;
319 int r;
320
321 r = path_compare(x->destination, y->destination);
322 if (r != 0)
323 return r;
324
325 if (x->type < y->type)
326 return -1;
327 if (x->type > y->type)
328 return 1;
329
330 return 0;
331 }
332
333 static int custom_mounts_prepare(void) {
334 unsigned i;
335 int r;
336
337 /* Ensure the mounts are applied prefix first. */
338 qsort_safe(arg_custom_mounts, arg_n_custom_mounts, sizeof(CustomMount), custom_mount_compare);
339
340 /* Allocate working directories for the overlay file systems that need it */
341 for (i = 0; i < arg_n_custom_mounts; i++) {
342 CustomMount *m = &arg_custom_mounts[i];
343
344 if (arg_userns && arg_uid_shift == UID_INVALID && path_equal(m->destination, "/")) {
345 log_error("--private-users with automatic UID shift may not be combined with custom root mounts.");
346 return -EINVAL;
347 }
348
349 if (m->type != CUSTOM_MOUNT_OVERLAY)
350 continue;
351
352 if (m->work_dir)
353 continue;
354
355 if (m->read_only)
356 continue;
357
358 r = tempfn_random(m->source, NULL, &m->work_dir);
359 if (r < 0)
360 return log_error_errno(r, "Failed to generate work directory from %s: %m", m->source);
361 }
362
363 return 0;
364 }
365
366 static int set_sanitized_path(char **b, const char *path) {
367 char *p;
368
369 assert(b);
370 assert(path);
371
372 p = canonicalize_file_name(path);
373 if (!p) {
374 if (errno != ENOENT)
375 return -errno;
376
377 p = path_make_absolute_cwd(path);
378 if (!p)
379 return -ENOMEM;
380 }
381
382 free(*b);
383 *b = path_kill_slashes(p);
384 return 0;
385 }
386
387 static int parse_argv(int argc, char *argv[]) {
388
389 enum {
390 ARG_VERSION = 0x100,
391 ARG_PRIVATE_NETWORK,
392 ARG_UUID,
393 ARG_READ_ONLY,
394 ARG_CAPABILITY,
395 ARG_DROP_CAPABILITY,
396 ARG_LINK_JOURNAL,
397 ARG_BIND,
398 ARG_BIND_RO,
399 ARG_TMPFS,
400 ARG_OVERLAY,
401 ARG_OVERLAY_RO,
402 ARG_SETENV,
403 ARG_SHARE_SYSTEM,
404 ARG_REGISTER,
405 ARG_KEEP_UNIT,
406 ARG_NETWORK_INTERFACE,
407 ARG_NETWORK_MACVLAN,
408 ARG_NETWORK_IPVLAN,
409 ARG_NETWORK_BRIDGE,
410 ARG_PERSONALITY,
411 ARG_VOLATILE,
412 ARG_TEMPLATE,
413 ARG_PROPERTY,
414 ARG_PRIVATE_USERS,
415 ARG_KILL_SIGNAL,
416 };
417
418 static const struct option options[] = {
419 { "help", no_argument, NULL, 'h' },
420 { "version", no_argument, NULL, ARG_VERSION },
421 { "directory", required_argument, NULL, 'D' },
422 { "template", required_argument, NULL, ARG_TEMPLATE },
423 { "ephemeral", no_argument, NULL, 'x' },
424 { "user", required_argument, NULL, 'u' },
425 { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
426 { "boot", no_argument, NULL, 'b' },
427 { "uuid", required_argument, NULL, ARG_UUID },
428 { "read-only", no_argument, NULL, ARG_READ_ONLY },
429 { "capability", required_argument, NULL, ARG_CAPABILITY },
430 { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
431 { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
432 { "bind", required_argument, NULL, ARG_BIND },
433 { "bind-ro", required_argument, NULL, ARG_BIND_RO },
434 { "tmpfs", required_argument, NULL, ARG_TMPFS },
435 { "overlay", required_argument, NULL, ARG_OVERLAY },
436 { "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
437 { "machine", required_argument, NULL, 'M' },
438 { "slice", required_argument, NULL, 'S' },
439 { "setenv", required_argument, NULL, ARG_SETENV },
440 { "selinux-context", required_argument, NULL, 'Z' },
441 { "selinux-apifs-context", required_argument, NULL, 'L' },
442 { "quiet", no_argument, NULL, 'q' },
443 { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
444 { "register", required_argument, NULL, ARG_REGISTER },
445 { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
446 { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
447 { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
448 { "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
449 { "network-veth", no_argument, NULL, 'n' },
450 { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
451 { "personality", required_argument, NULL, ARG_PERSONALITY },
452 { "image", required_argument, NULL, 'i' },
453 { "volatile", optional_argument, NULL, ARG_VOLATILE },
454 { "port", required_argument, NULL, 'p' },
455 { "property", required_argument, NULL, ARG_PROPERTY },
456 { "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
457 { "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
458 {}
459 };
460
461 int c, r;
462 uint64_t plus = 0, minus = 0;
463
464 assert(argc >= 0);
465 assert(argv);
466
467 while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:xp:n", options, NULL)) >= 0)
468
469 switch (c) {
470
471 case 'h':
472 help();
473 return 0;
474
475 case ARG_VERSION:
476 puts(PACKAGE_STRING);
477 puts(SYSTEMD_FEATURES);
478 return 0;
479
480 case 'D':
481 r = set_sanitized_path(&arg_directory, optarg);
482 if (r < 0)
483 return log_error_errno(r, "Invalid root directory: %m");
484
485 break;
486
487 case ARG_TEMPLATE:
488 r = set_sanitized_path(&arg_template, optarg);
489 if (r < 0)
490 return log_error_errno(r, "Invalid template directory: %m");
491
492 break;
493
494 case 'i':
495 r = set_sanitized_path(&arg_image, optarg);
496 if (r < 0)
497 return log_error_errno(r, "Invalid image path: %m");
498
499 break;
500
501 case 'x':
502 arg_ephemeral = true;
503 break;
504
505 case 'u':
506 free(arg_user);
507 arg_user = strdup(optarg);
508 if (!arg_user)
509 return log_oom();
510
511 break;
512
513 case ARG_NETWORK_BRIDGE:
514 arg_network_bridge = optarg;
515
516 /* fall through */
517
518 case 'n':
519 arg_network_veth = true;
520 arg_private_network = true;
521 break;
522
523 case ARG_NETWORK_INTERFACE:
524 if (strv_extend(&arg_network_interfaces, optarg) < 0)
525 return log_oom();
526
527 arg_private_network = true;
528 break;
529
530 case ARG_NETWORK_MACVLAN:
531 if (strv_extend(&arg_network_macvlan, optarg) < 0)
532 return log_oom();
533
534 arg_private_network = true;
535 break;
536
537 case ARG_NETWORK_IPVLAN:
538 if (strv_extend(&arg_network_ipvlan, optarg) < 0)
539 return log_oom();
540
541 /* fall through */
542
543 case ARG_PRIVATE_NETWORK:
544 arg_private_network = true;
545 break;
546
547 case 'b':
548 arg_boot = true;
549 break;
550
551 case ARG_UUID:
552 r = sd_id128_from_string(optarg, &arg_uuid);
553 if (r < 0) {
554 log_error("Invalid UUID: %s", optarg);
555 return r;
556 }
557 break;
558
559 case 'S':
560 arg_slice = optarg;
561 break;
562
563 case 'M':
564 if (isempty(optarg)) {
565 free(arg_machine);
566 arg_machine = NULL;
567 } else {
568 if (!machine_name_is_valid(optarg)) {
569 log_error("Invalid machine name: %s", optarg);
570 return -EINVAL;
571 }
572
573 r = free_and_strdup(&arg_machine, optarg);
574 if (r < 0)
575 return log_oom();
576
577 break;
578 }
579
580 case 'Z':
581 arg_selinux_context = optarg;
582 break;
583
584 case 'L':
585 arg_selinux_apifs_context = optarg;
586 break;
587
588 case ARG_READ_ONLY:
589 arg_read_only = true;
590 break;
591
592 case ARG_CAPABILITY:
593 case ARG_DROP_CAPABILITY: {
594 const char *state, *word;
595 size_t length;
596
597 FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
598 _cleanup_free_ char *t;
599
600 t = strndup(word, length);
601 if (!t)
602 return log_oom();
603
604 if (streq(t, "all")) {
605 if (c == ARG_CAPABILITY)
606 plus = (uint64_t) -1;
607 else
608 minus = (uint64_t) -1;
609 } else {
610 int cap;
611
612 cap = capability_from_name(t);
613 if (cap < 0) {
614 log_error("Failed to parse capability %s.", t);
615 return -EINVAL;
616 }
617
618 if (c == ARG_CAPABILITY)
619 plus |= 1ULL << (uint64_t) cap;
620 else
621 minus |= 1ULL << (uint64_t) cap;
622 }
623 }
624
625 break;
626 }
627
628 case 'j':
629 arg_link_journal = LINK_GUEST;
630 arg_link_journal_try = true;
631 break;
632
633 case ARG_LINK_JOURNAL:
634 if (streq(optarg, "auto")) {
635 arg_link_journal = LINK_AUTO;
636 arg_link_journal_try = false;
637 } else if (streq(optarg, "no")) {
638 arg_link_journal = LINK_NO;
639 arg_link_journal_try = false;
640 } else if (streq(optarg, "guest")) {
641 arg_link_journal = LINK_GUEST;
642 arg_link_journal_try = false;
643 } else if (streq(optarg, "host")) {
644 arg_link_journal = LINK_HOST;
645 arg_link_journal_try = false;
646 } else if (streq(optarg, "try-guest")) {
647 arg_link_journal = LINK_GUEST;
648 arg_link_journal_try = true;
649 } else if (streq(optarg, "try-host")) {
650 arg_link_journal = LINK_HOST;
651 arg_link_journal_try = true;
652 } else {
653 log_error("Failed to parse link journal mode %s", optarg);
654 return -EINVAL;
655 }
656
657 break;
658
659 case ARG_BIND:
660 case ARG_BIND_RO: {
661 _cleanup_free_ char *source = NULL, *destination = NULL;
662 CustomMount *m;
663 char *e;
664
665 e = strchr(optarg, ':');
666 if (e) {
667 source = strndup(optarg, e - optarg);
668 destination = strdup(e + 1);
669 } else {
670 source = strdup(optarg);
671 destination = strdup(optarg);
672 }
673
674 if (!source || !destination)
675 return log_oom();
676
677 if (!path_is_absolute(source) || !path_is_absolute(destination)) {
678 log_error("Invalid bind mount specification: %s", optarg);
679 return -EINVAL;
680 }
681
682 m = custom_mount_add(CUSTOM_MOUNT_BIND);
683 if (!m)
684 return log_oom();
685
686 m->source = source;
687 m->destination = destination;
688 m->read_only = c == ARG_BIND_RO;
689
690 source = destination = NULL;
691
692 break;
693 }
694
695 case ARG_TMPFS: {
696 _cleanup_free_ char *path = NULL, *opts = NULL;
697 CustomMount *m;
698 char *e;
699
700 e = strchr(optarg, ':');
701 if (e) {
702 path = strndup(optarg, e - optarg);
703 opts = strdup(e + 1);
704 } else {
705 path = strdup(optarg);
706 opts = strdup("mode=0755");
707 }
708
709 if (!path || !opts)
710 return log_oom();
711
712 if (!path_is_absolute(path)) {
713 log_error("Invalid tmpfs specification: %s", optarg);
714 return -EINVAL;
715 }
716
717 m = custom_mount_add(CUSTOM_MOUNT_TMPFS);
718 if (!m)
719 return log_oom();
720
721 m->destination = path;
722 m->options = opts;
723
724 path = opts = NULL;
725
726 break;
727 }
728
729 case ARG_OVERLAY:
730 case ARG_OVERLAY_RO: {
731 _cleanup_free_ char *upper = NULL, *destination = NULL;
732 _cleanup_strv_free_ char **lower = NULL;
733 CustomMount *m;
734 unsigned n = 0;
735 char **i;
736
737 lower = strv_split(optarg, ":");
738 if (!lower)
739 return log_oom();
740
741 STRV_FOREACH(i, lower) {
742 if (!path_is_absolute(*i)) {
743 log_error("Overlay path %s is not absolute.", *i);
744 return -EINVAL;
745 }
746
747 n++;
748 }
749
750 if (n < 2) {
751 log_error("--overlay= needs at least two colon-separated directories specified.");
752 return -EINVAL;
753 }
754
755 if (n == 2) {
756 /* If two parameters are specified,
757 * the first one is the lower, the
758 * second one the upper directory. And
759 * we'll also define the destination
760 * mount point the same as the upper. */
761 upper = lower[1];
762 lower[1] = NULL;
763
764 destination = strdup(upper);
765 if (!destination)
766 return log_oom();
767
768 } else {
769 upper = lower[n - 2];
770 destination = lower[n - 1];
771 lower[n - 2] = NULL;
772 }
773
774 m = custom_mount_add(CUSTOM_MOUNT_OVERLAY);
775 if (!m)
776 return log_oom();
777
778 m->destination = destination;
779 m->source = upper;
780 m->lower = lower;
781 m->read_only = c == ARG_OVERLAY_RO;
782
783 upper = destination = NULL;
784 lower = NULL;
785
786 break;
787 }
788
789 case ARG_SETENV: {
790 char **n;
791
792 if (!env_assignment_is_valid(optarg)) {
793 log_error("Environment variable assignment '%s' is not valid.", optarg);
794 return -EINVAL;
795 }
796
797 n = strv_env_set(arg_setenv, optarg);
798 if (!n)
799 return log_oom();
800
801 strv_free(arg_setenv);
802 arg_setenv = n;
803 break;
804 }
805
806 case 'q':
807 arg_quiet = true;
808 break;
809
810 case ARG_SHARE_SYSTEM:
811 arg_share_system = true;
812 break;
813
814 case ARG_REGISTER:
815 r = parse_boolean(optarg);
816 if (r < 0) {
817 log_error("Failed to parse --register= argument: %s", optarg);
818 return r;
819 }
820
821 arg_register = r;
822 break;
823
824 case ARG_KEEP_UNIT:
825 arg_keep_unit = true;
826 break;
827
828 case ARG_PERSONALITY:
829
830 arg_personality = personality_from_string(optarg);
831 if (arg_personality == PERSONALITY_INVALID) {
832 log_error("Unknown or unsupported personality '%s'.", optarg);
833 return -EINVAL;
834 }
835
836 break;
837
838 case ARG_VOLATILE:
839
840 if (!optarg)
841 arg_volatile = VOLATILE_YES;
842 else {
843 r = parse_boolean(optarg);
844 if (r < 0) {
845 if (streq(optarg, "state"))
846 arg_volatile = VOLATILE_STATE;
847 else {
848 log_error("Failed to parse --volatile= argument: %s", optarg);
849 return r;
850 }
851 } else
852 arg_volatile = r ? VOLATILE_YES : VOLATILE_NO;
853 }
854
855 break;
856
857 case 'p': {
858 const char *split, *e;
859 uint16_t container_port, host_port;
860 int protocol;
861 ExposePort *p;
862
863 if ((e = startswith(optarg, "tcp:")))
864 protocol = IPPROTO_TCP;
865 else if ((e = startswith(optarg, "udp:")))
866 protocol = IPPROTO_UDP;
867 else {
868 e = optarg;
869 protocol = IPPROTO_TCP;
870 }
871
872 split = strchr(e, ':');
873 if (split) {
874 char v[split - e + 1];
875
876 memcpy(v, e, split - e);
877 v[split - e] = 0;
878
879 r = safe_atou16(v, &host_port);
880 if (r < 0 || host_port <= 0) {
881 log_error("Failed to parse host port: %s", optarg);
882 return -EINVAL;
883 }
884
885 r = safe_atou16(split + 1, &container_port);
886 } else {
887 r = safe_atou16(e, &container_port);
888 host_port = container_port;
889 }
890
891 if (r < 0 || container_port <= 0) {
892 log_error("Failed to parse host port: %s", optarg);
893 return -EINVAL;
894 }
895
896 LIST_FOREACH(ports, p, arg_expose_ports) {
897 if (p->protocol == protocol && p->host_port == host_port) {
898 log_error("Duplicate port specification: %s", optarg);
899 return -EINVAL;
900 }
901 }
902
903 p = new(ExposePort, 1);
904 if (!p)
905 return log_oom();
906
907 p->protocol = protocol;
908 p->host_port = host_port;
909 p->container_port = container_port;
910
911 LIST_PREPEND(ports, arg_expose_ports, p);
912
913 break;
914 }
915
916 case ARG_PROPERTY:
917 if (strv_extend(&arg_property, optarg) < 0)
918 return log_oom();
919
920 break;
921
922 case ARG_PRIVATE_USERS:
923 if (optarg) {
924 _cleanup_free_ char *buffer = NULL;
925 const char *range, *shift;
926
927 range = strchr(optarg, ':');
928 if (range) {
929 buffer = strndup(optarg, range - optarg);
930 if (!buffer)
931 return log_oom();
932 shift = buffer;
933
934 range++;
935 if (safe_atou32(range, &arg_uid_range) < 0 || arg_uid_range <= 0) {
936 log_error("Failed to parse UID range: %s", range);
937 return -EINVAL;
938 }
939 } else
940 shift = optarg;
941
942 if (parse_uid(shift, &arg_uid_shift) < 0) {
943 log_error("Failed to parse UID: %s", optarg);
944 return -EINVAL;
945 }
946 }
947
948 arg_userns = true;
949 break;
950
951 case ARG_KILL_SIGNAL:
952 arg_kill_signal = signal_from_string_try_harder(optarg);
953 if (arg_kill_signal < 0) {
954 log_error("Cannot parse signal: %s", optarg);
955 return -EINVAL;
956 }
957
958 break;
959
960 case '?':
961 return -EINVAL;
962
963 default:
964 assert_not_reached("Unhandled option");
965 }
966
967 if (arg_share_system)
968 arg_register = false;
969
970 if (arg_boot && arg_share_system) {
971 log_error("--boot and --share-system may not be combined.");
972 return -EINVAL;
973 }
974
975 if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
976 log_error("--keep-unit may not be used when invoked from a user session.");
977 return -EINVAL;
978 }
979
980 if (arg_directory && arg_image) {
981 log_error("--directory= and --image= may not be combined.");
982 return -EINVAL;
983 }
984
985 if (arg_template && arg_image) {
986 log_error("--template= and --image= may not be combined.");
987 return -EINVAL;
988 }
989
990 if (arg_template && !(arg_directory || arg_machine)) {
991 log_error("--template= needs --directory= or --machine=.");
992 return -EINVAL;
993 }
994
995 if (arg_ephemeral && arg_template) {
996 log_error("--ephemeral and --template= may not be combined.");
997 return -EINVAL;
998 }
999
1000 if (arg_ephemeral && arg_image) {
1001 log_error("--ephemeral and --image= may not be combined.");
1002 return -EINVAL;
1003 }
1004
1005 if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
1006 log_error("--ephemeral and --link-journal= may not be combined.");
1007 return -EINVAL;
1008 }
1009
1010 if (arg_volatile != VOLATILE_NO && arg_read_only) {
1011 log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
1012 return -EINVAL;
1013 }
1014
1015 if (arg_expose_ports && !arg_private_network) {
1016 log_error("Cannot use --port= without private networking.");
1017 return -EINVAL;
1018 }
1019
1020 if (arg_userns && access("/proc/self/uid_map", F_OK) < 0)
1021 return log_error_errno(EOPNOTSUPP, "--private-users= is not supported, kernel compiled without user namespace support.");
1022
1023 arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
1024
1025 if (arg_boot && arg_kill_signal <= 0)
1026 arg_kill_signal = SIGRTMIN+3;
1027
1028 return 1;
1029 }
1030
1031 static int tmpfs_patch_options(const char *options, char **ret) {
1032 char *buf = NULL;
1033
1034 if (arg_userns && arg_uid_shift != 0) {
1035 assert(arg_uid_shift != UID_INVALID);
1036
1037 if (options)
1038 (void) asprintf(&buf, "%s,uid=" UID_FMT ",gid=" UID_FMT, options, arg_uid_shift, arg_uid_shift);
1039 else
1040 (void) asprintf(&buf, "uid=" UID_FMT ",gid=" UID_FMT, arg_uid_shift, arg_uid_shift);
1041 if (!buf)
1042 return -ENOMEM;
1043
1044 options = buf;
1045 }
1046
1047 #ifdef HAVE_SELINUX
1048 if (arg_selinux_apifs_context) {
1049 char *t;
1050
1051 if (options)
1052 t = strjoin(options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
1053 else
1054 t = strjoin("context=\"", arg_selinux_apifs_context, "\"", NULL);
1055 if (!t) {
1056 free(buf);
1057 return -ENOMEM;
1058 }
1059
1060 free(buf);
1061 buf = t;
1062 }
1063 #endif
1064
1065 *ret = buf;
1066 return !!buf;
1067 }
1068
1069 static int mount_all(const char *dest, bool userns) {
1070
1071 typedef struct MountPoint {
1072 const char *what;
1073 const char *where;
1074 const char *type;
1075 const char *options;
1076 unsigned long flags;
1077 bool fatal;
1078 bool userns;
1079 } MountPoint;
1080
1081 static const MountPoint mount_table[] = {
1082 { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true, true },
1083 { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true, true }, /* Bind mount first */
1084 { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, true, true }, /* Then, make it r/o */
1085 { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true, false },
1086 { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, true, false },
1087 { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true, false },
1088 { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
1089 { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true, false },
1090 { "tmpfs", "/tmp", "tmpfs", "mode=1777", MS_STRICTATIME, true, false },
1091 #ifdef HAVE_SELINUX
1092 { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false, false }, /* Bind mount first */
1093 { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT, false, false }, /* Then, make it r/o */
1094 #endif
1095 };
1096
1097 unsigned k;
1098 int r;
1099
1100 for (k = 0; k < ELEMENTSOF(mount_table); k++) {
1101 _cleanup_free_ char *where = NULL, *options = NULL;
1102 const char *o;
1103
1104 if (userns != mount_table[k].userns)
1105 continue;
1106
1107 where = prefix_root(dest, mount_table[k].where);
1108 if (!where)
1109 return log_oom();
1110
1111 r = path_is_mount_point(where, AT_SYMLINK_FOLLOW);
1112 if (r < 0 && r != -ENOENT)
1113 return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where);
1114
1115 /* Skip this entry if it is not a remount. */
1116 if (mount_table[k].what && r > 0)
1117 continue;
1118
1119 r = mkdir_p(where, 0755);
1120 if (r < 0) {
1121 if (mount_table[k].fatal)
1122 return log_error_errno(r, "Failed to create directory %s: %m", where);
1123
1124 log_warning_errno(r, "Failed to create directory %s: %m", where);
1125 continue;
1126 }
1127
1128 o = mount_table[k].options;
1129 if (streq_ptr(mount_table[k].type, "tmpfs")) {
1130 r = tmpfs_patch_options(o, &options);
1131 if (r < 0)
1132 return log_oom();
1133 if (r > 0)
1134 o = options;
1135 }
1136
1137 if (mount(mount_table[k].what,
1138 where,
1139 mount_table[k].type,
1140 mount_table[k].flags,
1141 o) < 0) {
1142
1143 if (mount_table[k].fatal)
1144 return log_error_errno(errno, "mount(%s) failed: %m", where);
1145
1146 log_warning_errno(errno, "mount(%s) failed, ignoring: %m", where);
1147 }
1148 }
1149
1150 return 0;
1151 }
1152
1153 static int mount_bind(const char *dest, CustomMount *m) {
1154 struct stat source_st, dest_st;
1155 const char *where;
1156 int r;
1157
1158 assert(m);
1159
1160 if (stat(m->source, &source_st) < 0)
1161 return log_error_errno(errno, "Failed to stat %s: %m", m->source);
1162
1163 where = prefix_roota(dest, m->destination);
1164
1165 if (stat(where, &dest_st) >= 0) {
1166 if (S_ISDIR(source_st.st_mode) && !S_ISDIR(dest_st.st_mode)) {
1167 log_error("Cannot bind mount directory %s on file %s.", m->source, where);
1168 return -EINVAL;
1169 }
1170
1171 if (!S_ISDIR(source_st.st_mode) && S_ISDIR(dest_st.st_mode)) {
1172 log_error("Cannot bind mount file %s on directory %s.", m->source, where);
1173 return -EINVAL;
1174 }
1175
1176 } else if (errno == ENOENT) {
1177 r = mkdir_parents_label(where, 0755);
1178 if (r < 0)
1179 return log_error_errno(r, "Failed to make parents of %s: %m", where);
1180 } else {
1181 log_error_errno(errno, "Failed to stat %s: %m", where);
1182 return -errno;
1183 }
1184
1185 /* Create the mount point. Any non-directory file can be
1186 * mounted on any non-directory file (regular, fifo, socket,
1187 * char, block).
1188 */
1189 if (S_ISDIR(source_st.st_mode))
1190 r = mkdir_label(where, 0755);
1191 else
1192 r = touch(where);
1193 if (r < 0 && r != -EEXIST)
1194 return log_error_errno(r, "Failed to create mount point %s: %m", where);
1195
1196 if (mount(m->source, where, NULL, MS_BIND, NULL) < 0)
1197 return log_error_errno(errno, "mount(%s) failed: %m", where);
1198
1199 if (m->read_only) {
1200 r = bind_remount_recursive(where, true);
1201 if (r < 0)
1202 return log_error_errno(r, "Read-only bind mount failed: %m");
1203 }
1204
1205 return 0;
1206 }
1207
1208 static int mount_tmpfs(const char *dest, CustomMount *m) {
1209 const char *where, *options;
1210 _cleanup_free_ char *buf = NULL;
1211 int r;
1212
1213 assert(dest);
1214 assert(m);
1215
1216 where = prefix_roota(dest, m->destination);
1217
1218 r = mkdir_p_label(where, 0755);
1219 if (r < 0 && r != -EEXIST)
1220 return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where);
1221
1222 r = tmpfs_patch_options(m->options, &buf);
1223 if (r < 0)
1224 return log_oom();
1225 options = r > 0 ? buf : m->options;
1226
1227 if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, options) < 0)
1228 return log_error_errno(errno, "tmpfs mount to %s failed: %m", where);
1229
1230 return 0;
1231 }
1232
1233 static int mount_overlay(const char *dest, CustomMount *m) {
1234 _cleanup_free_ char *lower = NULL;
1235 const char *where, *options;
1236 int r;
1237
1238 assert(dest);
1239 assert(m);
1240
1241 where = prefix_roota(dest, m->destination);
1242
1243 r = mkdir_label(where, 0755);
1244 if (r < 0 && r != -EEXIST)
1245 return log_error_errno(r, "Creating mount point for overlay %s failed: %m", where);
1246
1247 (void) mkdir_p_label(m->source, 0755);
1248
1249 strv_reverse(m->lower);
1250 lower = strv_join(m->lower, ":");
1251 strv_reverse(m->lower);
1252 if (!lower)
1253 return log_oom();
1254
1255 if (m->read_only)
1256 options = strjoina("lowerdir=", m->source, ":", lower);
1257 else {
1258 assert(m->work_dir);
1259 (void) mkdir_label(m->work_dir, 0700);
1260
1261 options = strjoina("lowerdir=", lower, ",upperdir=", m->source, ",workdir=", m->work_dir);
1262 }
1263
1264 if (mount("overlay", where, "overlay", m->read_only ? MS_RDONLY : 0, options) < 0)
1265 return log_error_errno(errno, "overlay mount to %s failed: %m", where);
1266
1267 return 0;
1268 }
1269
1270 static int mount_custom(const char *dest) {
1271 unsigned i;
1272 int r;
1273
1274 assert(dest);
1275
1276 for (i = 0; i < arg_n_custom_mounts; i++) {
1277 CustomMount *m = &arg_custom_mounts[i];
1278
1279 switch (m->type) {
1280
1281 case CUSTOM_MOUNT_BIND:
1282 r = mount_bind(dest, m);
1283 break;
1284
1285 case CUSTOM_MOUNT_TMPFS:
1286 r = mount_tmpfs(dest, m);
1287 break;
1288
1289 case CUSTOM_MOUNT_OVERLAY:
1290 r = mount_overlay(dest, m);
1291 break;
1292
1293 default:
1294 assert_not_reached("Unknown custom mount type");
1295 }
1296
1297 if (r < 0)
1298 return r;
1299 }
1300
1301 return 0;
1302 }
1303
1304 static int mount_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
1305 char *to;
1306 int r;
1307
1308 to = strjoina(dest, "/sys/fs/cgroup/", hierarchy);
1309
1310 r = path_is_mount_point(to, 0);
1311 if (r < 0 && r != -ENOENT)
1312 return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to);
1313 if (r > 0)
1314 return 0;
1315
1316 mkdir_p(to, 0755);
1317
1318 /* The superblock mount options of the mount point need to be
1319 * identical to the hosts', and hence writable... */
1320 if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV, controller) < 0)
1321 return log_error_errno(errno, "Failed to mount to %s: %m", to);
1322
1323 /* ... hence let's only make the bind mount read-only, not the
1324 * superblock. */
1325 if (read_only) {
1326 if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
1327 return log_error_errno(errno, "Failed to remount %s read-only: %m", to);
1328 }
1329 return 1;
1330 }
1331
1332 static int mount_cgroup(const char *dest) {
1333 _cleanup_set_free_free_ Set *controllers = NULL;
1334 const char *cgroup_root;
1335 int r;
1336
1337 controllers = set_new(&string_hash_ops);
1338 if (!controllers)
1339 return log_oom();
1340
1341 r = cg_kernel_controllers(controllers);
1342 if (r < 0)
1343 return log_error_errno(r, "Failed to determine cgroup controllers: %m");
1344
1345 for (;;) {
1346 _cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL;
1347
1348 controller = set_steal_first(controllers);
1349 if (!controller)
1350 break;
1351
1352 origin = prefix_root("/sys/fs/cgroup/", controller);
1353 if (!origin)
1354 return log_oom();
1355
1356 r = readlink_malloc(origin, &combined);
1357 if (r == -EINVAL) {
1358 /* Not a symbolic link, but directly a single cgroup hierarchy */
1359
1360 r = mount_cgroup_hierarchy(dest, controller, controller, true);
1361 if (r < 0)
1362 return r;
1363
1364 } else if (r < 0)
1365 return log_error_errno(r, "Failed to read link %s: %m", origin);
1366 else {
1367 _cleanup_free_ char *target = NULL;
1368
1369 target = prefix_root(dest, origin);
1370 if (!target)
1371 return log_oom();
1372
1373 /* A symbolic link, a combination of controllers in one hierarchy */
1374
1375 if (!filename_is_valid(combined)) {
1376 log_warning("Ignoring invalid combined hierarchy %s.", combined);
1377 continue;
1378 }
1379
1380 r = mount_cgroup_hierarchy(dest, combined, combined, true);
1381 if (r < 0)
1382 return r;
1383
1384 r = symlink_idempotent(combined, target);
1385 if (r == -EINVAL) {
1386 log_error("Invalid existing symlink for combined hierarchy");
1387 return r;
1388 }
1389 if (r < 0)
1390 return log_error_errno(r, "Failed to create symlink for combined hierarchy: %m");
1391 }
1392 }
1393
1394 r = mount_cgroup_hierarchy(dest, "name=systemd,xattr", "systemd", false);
1395 if (r < 0)
1396 return r;
1397
1398 cgroup_root = prefix_roota(dest, "/sys/fs/cgroup");
1399 if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
1400 return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
1401
1402 return 0;
1403 }
1404
1405 static int mount_systemd_cgroup_writable(const char *dest) {
1406 _cleanup_free_ char *own_cgroup_path = NULL;
1407 const char *systemd_root, *systemd_own;
1408 int r;
1409
1410 assert(dest);
1411
1412 r = cg_pid_get_path(NULL, 0, &own_cgroup_path);
1413 if (r < 0)
1414 return log_error_errno(r, "Failed to determine our own cgroup path: %m");
1415
1416 /* Make our own cgroup a (writable) bind mount */
1417 systemd_own = strjoina(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
1418 if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
1419 return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
1420
1421 /* And then remount the systemd cgroup root read-only */
1422 systemd_root = prefix_roota(dest, "/sys/fs/cgroup/systemd");
1423 if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
1424 return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
1425
1426 return 0;
1427 }
1428
1429 static int userns_lchown(const char *p, uid_t uid, gid_t gid) {
1430 assert(p);
1431
1432 if (!arg_userns)
1433 return 0;
1434
1435 if (uid == UID_INVALID && gid == GID_INVALID)
1436 return 0;
1437
1438 if (uid != UID_INVALID) {
1439 uid += arg_uid_shift;
1440
1441 if (uid < arg_uid_shift || uid >= arg_uid_shift + arg_uid_range)
1442 return -EOVERFLOW;
1443 }
1444
1445 if (gid != GID_INVALID) {
1446 gid += (gid_t) arg_uid_shift;
1447
1448 if (gid < (gid_t) arg_uid_shift || gid >= (gid_t) (arg_uid_shift + arg_uid_range))
1449 return -EOVERFLOW;
1450 }
1451
1452 if (lchown(p, uid, gid) < 0)
1453 return -errno;
1454
1455 return 0;
1456 }
1457
1458 static int userns_mkdir(const char *root, const char *path, mode_t mode, uid_t uid, gid_t gid) {
1459 const char *q;
1460
1461 q = prefix_roota(root, path);
1462 if (mkdir(q, mode) < 0) {
1463 if (errno == EEXIST)
1464 return 0;
1465 return -errno;
1466 }
1467
1468 return userns_lchown(q, uid, gid);
1469 }
1470
1471 static int setup_timezone(const char *dest) {
1472 _cleanup_free_ char *p = NULL, *q = NULL;
1473 const char *where, *check, *what;
1474 char *z, *y;
1475 int r;
1476
1477 assert(dest);
1478
1479 /* Fix the timezone, if possible */
1480 r = readlink_malloc("/etc/localtime", &p);
1481 if (r < 0) {
1482 log_warning("/etc/localtime is not a symlink, not updating container timezone.");
1483 return 0;
1484 }
1485
1486 z = path_startswith(p, "../usr/share/zoneinfo/");
1487 if (!z)
1488 z = path_startswith(p, "/usr/share/zoneinfo/");
1489 if (!z) {
1490 log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
1491 return 0;
1492 }
1493
1494 where = prefix_roota(dest, "/etc/localtime");
1495 r = readlink_malloc(where, &q);
1496 if (r >= 0) {
1497 y = path_startswith(q, "../usr/share/zoneinfo/");
1498 if (!y)
1499 y = path_startswith(q, "/usr/share/zoneinfo/");
1500
1501 /* Already pointing to the right place? Then do nothing .. */
1502 if (y && streq(y, z))
1503 return 0;
1504 }
1505
1506 check = strjoina("/usr/share/zoneinfo/", z);
1507 check = prefix_root(dest, check);
1508 if (laccess(check, F_OK) < 0) {
1509 log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
1510 return 0;
1511 }
1512
1513 r = unlink(where);
1514 if (r < 0 && errno != ENOENT) {
1515 log_error_errno(errno, "Failed to remove existing timezone info %s in container: %m", where);
1516 return 0;
1517 }
1518
1519 what = strjoina("../usr/share/zoneinfo/", z);
1520 if (symlink(what, where) < 0) {
1521 log_error_errno(errno, "Failed to correct timezone of container: %m");
1522 return 0;
1523 }
1524
1525 r = userns_lchown(where, 0, 0);
1526 if (r < 0)
1527 return log_warning_errno(r, "Failed to chown /etc/localtime: %m");
1528
1529 return 0;
1530 }
1531
1532 static int setup_resolv_conf(const char *dest) {
1533 const char *where = NULL;
1534 int r;
1535
1536 assert(dest);
1537
1538 if (arg_private_network)
1539 return 0;
1540
1541 /* Fix resolv.conf, if possible */
1542 where = prefix_roota(dest, "/etc/resolv.conf");
1543
1544 r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644, 0);
1545 if (r < 0) {
1546 /* If the file already exists as symlink, let's
1547 * suppress the warning, under the assumption that
1548 * resolved or something similar runs inside and the
1549 * symlink points there.
1550 *
1551 * If the disk image is read-only, there's also no
1552 * point in complaining.
1553 */
1554 log_full_errno(IN_SET(r, -ELOOP, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
1555 "Failed to copy /etc/resolv.conf to %s: %m", where);
1556 return 0;
1557 }
1558
1559 r = userns_lchown(where, 0, 0);
1560 if (r < 0)
1561 log_warning_errno(r, "Failed to chown /etc/resolv.conf: %m");
1562
1563 return 0;
1564 }
1565
1566 static int setup_volatile_state(const char *directory) {
1567 _cleanup_free_ char *buf = NULL;
1568 const char *p, *options;
1569 int r;
1570
1571 assert(directory);
1572
1573 if (arg_volatile != VOLATILE_STATE)
1574 return 0;
1575
1576 /* --volatile=state means we simply overmount /var
1577 with a tmpfs, and the rest read-only. */
1578
1579 r = bind_remount_recursive(directory, true);
1580 if (r < 0)
1581 return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
1582
1583 p = prefix_roota(directory, "/var");
1584 r = mkdir(p, 0755);
1585 if (r < 0 && errno != EEXIST)
1586 return log_error_errno(errno, "Failed to create %s: %m", directory);
1587
1588 options = "mode=755";
1589 r = tmpfs_patch_options(options, &buf);
1590 if (r < 0)
1591 return log_oom();
1592 if (r > 0)
1593 options = buf;
1594
1595 if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, options) < 0)
1596 return log_error_errno(errno, "Failed to mount tmpfs to /var: %m");
1597
1598 return 0;
1599 }
1600
1601 static int setup_volatile(const char *directory) {
1602 bool tmpfs_mounted = false, bind_mounted = false;
1603 char template[] = "/tmp/nspawn-volatile-XXXXXX";
1604 _cleanup_free_ char *buf = NULL;
1605 const char *f, *t, *options;
1606 int r;
1607
1608 assert(directory);
1609
1610 if (arg_volatile != VOLATILE_YES)
1611 return 0;
1612
1613 /* --volatile=yes means we mount a tmpfs to the root dir, and
1614 the original /usr to use inside it, and that read-only. */
1615
1616 if (!mkdtemp(template))
1617 return log_error_errno(errno, "Failed to create temporary directory: %m");
1618
1619 options = "mode=755";
1620 r = tmpfs_patch_options(options, &buf);
1621 if (r < 0)
1622 return log_oom();
1623 if (r > 0)
1624 options = buf;
1625
1626 if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, options) < 0) {
1627 r = log_error_errno(errno, "Failed to mount tmpfs for root directory: %m");
1628 goto fail;
1629 }
1630
1631 tmpfs_mounted = true;
1632
1633 f = prefix_roota(directory, "/usr");
1634 t = prefix_roota(template, "/usr");
1635
1636 r = mkdir(t, 0755);
1637 if (r < 0 && errno != EEXIST) {
1638 r = log_error_errno(errno, "Failed to create %s: %m", t);
1639 goto fail;
1640 }
1641
1642 if (mount(f, t, NULL, MS_BIND|MS_REC, NULL) < 0) {
1643 r = log_error_errno(errno, "Failed to create /usr bind mount: %m");
1644 goto fail;
1645 }
1646
1647 bind_mounted = true;
1648
1649 r = bind_remount_recursive(t, true);
1650 if (r < 0) {
1651 log_error_errno(r, "Failed to remount %s read-only: %m", t);
1652 goto fail;
1653 }
1654
1655 if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
1656 r = log_error_errno(errno, "Failed to move root mount: %m");
1657 goto fail;
1658 }
1659
1660 (void) rmdir(template);
1661
1662 return 0;
1663
1664 fail:
1665 if (bind_mounted)
1666 (void) umount(t);
1667
1668 if (tmpfs_mounted)
1669 (void) umount(template);
1670 (void) rmdir(template);
1671 return r;
1672 }
1673
1674 static char* id128_format_as_uuid(sd_id128_t id, char s[37]) {
1675 assert(s);
1676
1677 snprintf(s, 37,
1678 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
1679 SD_ID128_FORMAT_VAL(id));
1680
1681 return s;
1682 }
1683
1684 static int setup_boot_id(const char *dest) {
1685 const char *from, *to;
1686 sd_id128_t rnd = {};
1687 char as_uuid[37];
1688 int r;
1689
1690 if (arg_share_system)
1691 return 0;
1692
1693 /* Generate a new randomized boot ID, so that each boot-up of
1694 * the container gets a new one */
1695
1696 from = prefix_roota(dest, "/run/proc-sys-kernel-random-boot-id");
1697 to = prefix_roota(dest, "/proc/sys/kernel/random/boot_id");
1698
1699 r = sd_id128_randomize(&rnd);
1700 if (r < 0)
1701 return log_error_errno(r, "Failed to generate random boot id: %m");
1702
1703 id128_format_as_uuid(rnd, as_uuid);
1704
1705 r = write_string_file(from, as_uuid, WRITE_STRING_FILE_CREATE);
1706 if (r < 0)
1707 return log_error_errno(r, "Failed to write boot id: %m");
1708
1709 if (mount(from, to, NULL, MS_BIND, NULL) < 0)
1710 r = log_error_errno(errno, "Failed to bind mount boot id: %m");
1711 else if (mount(NULL, to, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY|MS_NOSUID|MS_NODEV, NULL) < 0)
1712 log_warning_errno(errno, "Failed to make boot id read-only: %m");
1713
1714 unlink(from);
1715 return r;
1716 }
1717
1718 static int copy_devnodes(const char *dest) {
1719
1720 static const char devnodes[] =
1721 "null\0"
1722 "zero\0"
1723 "full\0"
1724 "random\0"
1725 "urandom\0"
1726 "tty\0"
1727 "net/tun\0";
1728
1729 const char *d;
1730 int r = 0;
1731 _cleanup_umask_ mode_t u;
1732
1733 assert(dest);
1734
1735 u = umask(0000);
1736
1737 /* Create /dev/net, so that we can create /dev/net/tun in it */
1738 if (userns_mkdir(dest, "/dev/net", 0755, 0, 0) < 0)
1739 return log_error_errno(r, "Failed to create /dev/net directory: %m");
1740
1741 NULSTR_FOREACH(d, devnodes) {
1742 _cleanup_free_ char *from = NULL, *to = NULL;
1743 struct stat st;
1744
1745 from = strappend("/dev/", d);
1746 to = prefix_root(dest, from);
1747
1748 if (stat(from, &st) < 0) {
1749
1750 if (errno != ENOENT)
1751 return log_error_errno(errno, "Failed to stat %s: %m", from);
1752
1753 } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
1754
1755 log_error("%s is not a char or block device, cannot copy.", from);
1756 return -EIO;
1757
1758 } else {
1759 if (mknod(to, st.st_mode, st.st_rdev) < 0) {
1760 if (errno != EPERM)
1761 return log_error_errno(errno, "mknod(%s) failed: %m", to);
1762
1763 /* Some systems abusively restrict mknod but
1764 * allow bind mounts. */
1765 r = touch(to);
1766 if (r < 0)
1767 return log_error_errno(r, "touch (%s) failed: %m", to);
1768 if (mount(from, to, NULL, MS_BIND, NULL) < 0)
1769 return log_error_errno(errno, "Both mknod and bind mount (%s) failed: %m", to);
1770 }
1771
1772 r = userns_lchown(to, 0, 0);
1773 if (r < 0)
1774 return log_error_errno(r, "chown() of device node %s failed: %m", to);
1775 }
1776 }
1777
1778 return r;
1779 }
1780
1781 static int setup_pts(const char *dest) {
1782 _cleanup_free_ char *options = NULL;
1783 const char *p;
1784
1785 #ifdef HAVE_SELINUX
1786 if (arg_selinux_apifs_context)
1787 (void) asprintf(&options,
1788 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT ",context=\"%s\"",
1789 arg_uid_shift + TTY_GID,
1790 arg_selinux_apifs_context);
1791 else
1792 #endif
1793 (void) asprintf(&options,
1794 "newinstance,ptmxmode=0666,mode=620,gid=" GID_FMT,
1795 arg_uid_shift + TTY_GID);
1796
1797 if (!options)
1798 return log_oom();
1799
1800 /* Mount /dev/pts itself */
1801 p = prefix_roota(dest, "/dev/pts");
1802 if (mkdir(p, 0755) < 0)
1803 return log_error_errno(errno, "Failed to create /dev/pts: %m");
1804 if (mount("devpts", p, "devpts", MS_NOSUID|MS_NOEXEC, options) < 0)
1805 return log_error_errno(errno, "Failed to mount /dev/pts: %m");
1806 if (userns_lchown(p, 0, 0) < 0)
1807 return log_error_errno(errno, "Failed to chown /dev/pts: %m");
1808
1809 /* Create /dev/ptmx symlink */
1810 p = prefix_roota(dest, "/dev/ptmx");
1811 if (symlink("pts/ptmx", p) < 0)
1812 return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
1813 if (userns_lchown(p, 0, 0) < 0)
1814 return log_error_errno(errno, "Failed to chown /dev/ptmx: %m");
1815
1816 /* And fix /dev/pts/ptmx ownership */
1817 p = prefix_roota(dest, "/dev/pts/ptmx");
1818 if (userns_lchown(p, 0, 0) < 0)
1819 return log_error_errno(errno, "Failed to chown /dev/pts/ptmx: %m");
1820
1821 return 0;
1822 }
1823
1824 static int setup_dev_console(const char *dest, const char *console) {
1825 _cleanup_umask_ mode_t u;
1826 const char *to;
1827 int r;
1828
1829 assert(dest);
1830 assert(console);
1831
1832 u = umask(0000);
1833
1834 r = chmod_and_chown(console, 0600, arg_uid_shift, arg_uid_shift);
1835 if (r < 0)
1836 return log_error_errno(r, "Failed to correct access mode for TTY: %m");
1837
1838 /* We need to bind mount the right tty to /dev/console since
1839 * ptys can only exist on pts file systems. To have something
1840 * to bind mount things on we create a empty regular file. */
1841
1842 to = prefix_roota(dest, "/dev/console");
1843 r = touch(to);
1844 if (r < 0)
1845 return log_error_errno(r, "touch() for /dev/console failed: %m");
1846
1847 if (mount(console, to, NULL, MS_BIND, NULL) < 0)
1848 return log_error_errno(errno, "Bind mount for /dev/console failed: %m");
1849
1850 return 0;
1851 }
1852
1853 static int setup_kmsg(const char *dest, int kmsg_socket) {
1854 const char *from, *to;
1855 _cleanup_umask_ mode_t u;
1856 int fd, k;
1857 union {
1858 struct cmsghdr cmsghdr;
1859 uint8_t buf[CMSG_SPACE(sizeof(int))];
1860 } control = {};
1861 struct msghdr mh = {
1862 .msg_control = &control,
1863 .msg_controllen = sizeof(control),
1864 };
1865 struct cmsghdr *cmsg;
1866
1867 assert(kmsg_socket >= 0);
1868
1869 u = umask(0000);
1870
1871 /* We create the kmsg FIFO as /run/kmsg, but immediately
1872 * delete it after bind mounting it to /proc/kmsg. While FIFOs
1873 * on the reading side behave very similar to /proc/kmsg,
1874 * their writing side behaves differently from /dev/kmsg in
1875 * that writing blocks when nothing is reading. In order to
1876 * avoid any problems with containers deadlocking due to this
1877 * we simply make /dev/kmsg unavailable to the container. */
1878 from = prefix_roota(dest, "/run/kmsg");
1879 to = prefix_roota(dest, "/proc/kmsg");
1880
1881 if (mkfifo(from, 0600) < 0)
1882 return log_error_errno(errno, "mkfifo() for /run/kmsg failed: %m");
1883 if (mount(from, to, NULL, MS_BIND, NULL) < 0)
1884 return log_error_errno(errno, "Bind mount for /proc/kmsg failed: %m");
1885
1886 fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
1887 if (fd < 0)
1888 return log_error_errno(errno, "Failed to open fifo: %m");
1889
1890 cmsg = CMSG_FIRSTHDR(&mh);
1891 cmsg->cmsg_level = SOL_SOCKET;
1892 cmsg->cmsg_type = SCM_RIGHTS;
1893 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1894 memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
1895
1896 mh.msg_controllen = cmsg->cmsg_len;
1897
1898 /* Store away the fd in the socket, so that it stays open as
1899 * long as we run the child */
1900 k = sendmsg(kmsg_socket, &mh, MSG_NOSIGNAL);
1901 safe_close(fd);
1902
1903 if (k < 0)
1904 return log_error_errno(errno, "Failed to send FIFO fd: %m");
1905
1906 /* And now make the FIFO unavailable as /run/kmsg... */
1907 (void) unlink(from);
1908
1909 return 0;
1910 }
1911
1912 static int send_rtnl(int send_fd) {
1913 union {
1914 struct cmsghdr cmsghdr;
1915 uint8_t buf[CMSG_SPACE(sizeof(int))];
1916 } control = {};
1917 struct msghdr mh = {
1918 .msg_control = &control,
1919 .msg_controllen = sizeof(control),
1920 };
1921 struct cmsghdr *cmsg;
1922 _cleanup_close_ int fd = -1;
1923 ssize_t k;
1924
1925 assert(send_fd >= 0);
1926
1927 if (!arg_expose_ports)
1928 return 0;
1929
1930 fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
1931 if (fd < 0)
1932 return log_error_errno(errno, "Failed to allocate container netlink: %m");
1933
1934 cmsg = CMSG_FIRSTHDR(&mh);
1935 cmsg->cmsg_level = SOL_SOCKET;
1936 cmsg->cmsg_type = SCM_RIGHTS;
1937 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
1938 memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
1939
1940 mh.msg_controllen = cmsg->cmsg_len;
1941
1942 /* Store away the fd in the socket, so that it stays open as
1943 * long as we run the child */
1944 k = sendmsg(send_fd, &mh, MSG_NOSIGNAL);
1945 if (k < 0)
1946 return log_error_errno(errno, "Failed to send netlink fd: %m");
1947
1948 return 0;
1949 }
1950
1951 static int flush_ports(union in_addr_union *exposed) {
1952 ExposePort *p;
1953 int r, af = AF_INET;
1954
1955 assert(exposed);
1956
1957 if (!arg_expose_ports)
1958 return 0;
1959
1960 if (in_addr_is_null(af, exposed))
1961 return 0;
1962
1963 log_debug("Lost IP address.");
1964
1965 LIST_FOREACH(ports, p, arg_expose_ports) {
1966 r = fw_add_local_dnat(false,
1967 af,
1968 p->protocol,
1969 NULL,
1970 NULL, 0,
1971 NULL, 0,
1972 p->host_port,
1973 exposed,
1974 p->container_port,
1975 NULL);
1976 if (r < 0)
1977 log_warning_errno(r, "Failed to modify firewall: %m");
1978 }
1979
1980 *exposed = IN_ADDR_NULL;
1981 return 0;
1982 }
1983
1984 static int expose_ports(sd_netlink *rtnl, union in_addr_union *exposed) {
1985 _cleanup_free_ struct local_address *addresses = NULL;
1986 _cleanup_free_ char *pretty = NULL;
1987 union in_addr_union new_exposed;
1988 ExposePort *p;
1989 bool add;
1990 int af = AF_INET, r;
1991
1992 assert(exposed);
1993
1994 /* Invoked each time an address is added or removed inside the
1995 * container */
1996
1997 if (!arg_expose_ports)
1998 return 0;
1999
2000 r = local_addresses(rtnl, 0, af, &addresses);
2001 if (r < 0)
2002 return log_error_errno(r, "Failed to enumerate local addresses: %m");
2003
2004 add = r > 0 &&
2005 addresses[0].family == af &&
2006 addresses[0].scope < RT_SCOPE_LINK;
2007
2008 if (!add)
2009 return flush_ports(exposed);
2010
2011 new_exposed = addresses[0].address;
2012 if (in_addr_equal(af, exposed, &new_exposed))
2013 return 0;
2014
2015 in_addr_to_string(af, &new_exposed, &pretty);
2016 log_debug("New container IP is %s.", strna(pretty));
2017
2018 LIST_FOREACH(ports, p, arg_expose_ports) {
2019
2020 r = fw_add_local_dnat(true,
2021 af,
2022 p->protocol,
2023 NULL,
2024 NULL, 0,
2025 NULL, 0,
2026 p->host_port,
2027 &new_exposed,
2028 p->container_port,
2029 in_addr_is_null(af, exposed) ? NULL : exposed);
2030 if (r < 0)
2031 log_warning_errno(r, "Failed to modify firewall: %m");
2032 }
2033
2034 *exposed = new_exposed;
2035 return 0;
2036 }
2037
2038 static int on_address_change(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
2039 union in_addr_union *exposed = userdata;
2040
2041 assert(rtnl);
2042 assert(m);
2043 assert(exposed);
2044
2045 expose_ports(rtnl, exposed);
2046 return 0;
2047 }
2048
2049 static int watch_rtnl(sd_event *event, int recv_fd, union in_addr_union *exposed, sd_netlink **ret) {
2050 union {
2051 struct cmsghdr cmsghdr;
2052 uint8_t buf[CMSG_SPACE(sizeof(int))];
2053 } control = {};
2054 struct msghdr mh = {
2055 .msg_control = &control,
2056 .msg_controllen = sizeof(control),
2057 };
2058 struct cmsghdr *cmsg;
2059 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2060 int fd, r;
2061 ssize_t k;
2062
2063 assert(event);
2064 assert(recv_fd >= 0);
2065 assert(ret);
2066
2067 if (!arg_expose_ports)
2068 return 0;
2069
2070 k = recvmsg(recv_fd, &mh, MSG_NOSIGNAL);
2071 if (k < 0)
2072 return log_error_errno(errno, "Failed to recv netlink fd: %m");
2073
2074 cmsg = CMSG_FIRSTHDR(&mh);
2075 assert(cmsg->cmsg_level == SOL_SOCKET);
2076 assert(cmsg->cmsg_type == SCM_RIGHTS);
2077 assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int)));
2078 memcpy(&fd, CMSG_DATA(cmsg), sizeof(int));
2079
2080 r = sd_netlink_open_fd(&rtnl, fd);
2081 if (r < 0) {
2082 safe_close(fd);
2083 return log_error_errno(r, "Failed to create rtnl object: %m");
2084 }
2085
2086 r = sd_netlink_add_match(rtnl, RTM_NEWADDR, on_address_change, exposed);
2087 if (r < 0)
2088 return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m");
2089
2090 r = sd_netlink_add_match(rtnl, RTM_DELADDR, on_address_change, exposed);
2091 if (r < 0)
2092 return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m");
2093
2094 r = sd_netlink_attach_event(rtnl, event, 0);
2095 if (r < 0)
2096 return log_error_errno(r, "Failed to add to even loop: %m");
2097
2098 *ret = rtnl;
2099 rtnl = NULL;
2100
2101 return 0;
2102 }
2103
2104 static int setup_hostname(void) {
2105
2106 if (arg_share_system)
2107 return 0;
2108
2109 if (sethostname_idempotent(arg_machine) < 0)
2110 return -errno;
2111
2112 return 0;
2113 }
2114
2115 static int setup_journal(const char *directory) {
2116 sd_id128_t machine_id, this_id;
2117 _cleanup_free_ char *b = NULL, *d = NULL;
2118 const char *etc_machine_id, *p, *q;
2119 char *id;
2120 int r;
2121
2122 /* Don't link journals in ephemeral mode */
2123 if (arg_ephemeral)
2124 return 0;
2125
2126 etc_machine_id = prefix_roota(directory, "/etc/machine-id");
2127
2128 r = read_one_line_file(etc_machine_id, &b);
2129 if (r == -ENOENT && arg_link_journal == LINK_AUTO)
2130 return 0;
2131 else if (r < 0)
2132 return log_error_errno(r, "Failed to read machine ID from %s: %m", etc_machine_id);
2133
2134 id = strstrip(b);
2135 if (isempty(id) && arg_link_journal == LINK_AUTO)
2136 return 0;
2137
2138 /* Verify validity */
2139 r = sd_id128_from_string(id, &machine_id);
2140 if (r < 0)
2141 return log_error_errno(r, "Failed to parse machine ID from %s: %m", etc_machine_id);
2142
2143 r = sd_id128_get_machine(&this_id);
2144 if (r < 0)
2145 return log_error_errno(r, "Failed to retrieve machine ID: %m");
2146
2147 if (sd_id128_equal(machine_id, this_id)) {
2148 log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
2149 "Host and machine ids are equal (%s): refusing to link journals", id);
2150 if (arg_link_journal == LINK_AUTO)
2151 return 0;
2152 return -EEXIST;
2153 }
2154
2155 if (arg_link_journal == LINK_NO)
2156 return 0;
2157
2158 r = userns_mkdir(directory, "/var", 0755, 0, 0);
2159 if (r < 0)
2160 return log_error_errno(r, "Failed to create /var: %m");
2161
2162 r = userns_mkdir(directory, "/var/log", 0755, 0, 0);
2163 if (r < 0)
2164 return log_error_errno(r, "Failed to create /var/log: %m");
2165
2166 r = userns_mkdir(directory, "/var/log/journal", 0755, 0, 0);
2167 if (r < 0)
2168 return log_error_errno(r, "Failed to create /var/log/journal: %m");
2169
2170 p = strjoina("/var/log/journal/", id);
2171 q = prefix_roota(directory, p);
2172
2173 if (path_is_mount_point(p, 0) > 0) {
2174 if (arg_link_journal != LINK_AUTO) {
2175 log_error("%s: already a mount point, refusing to use for journal", p);
2176 return -EEXIST;
2177 }
2178
2179 return 0;
2180 }
2181
2182 if (path_is_mount_point(q, 0) > 0) {
2183 if (arg_link_journal != LINK_AUTO) {
2184 log_error("%s: already a mount point, refusing to use for journal", q);
2185 return -EEXIST;
2186 }
2187
2188 return 0;
2189 }
2190
2191 r = readlink_and_make_absolute(p, &d);
2192 if (r >= 0) {
2193 if ((arg_link_journal == LINK_GUEST ||
2194 arg_link_journal == LINK_AUTO) &&
2195 path_equal(d, q)) {
2196
2197 r = userns_mkdir(directory, p, 0755, 0, 0);
2198 if (r < 0)
2199 log_warning_errno(errno, "Failed to create directory %s: %m", q);
2200 return 0;
2201 }
2202
2203 if (unlink(p) < 0)
2204 return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
2205 } else if (r == -EINVAL) {
2206
2207 if (arg_link_journal == LINK_GUEST &&
2208 rmdir(p) < 0) {
2209
2210 if (errno == ENOTDIR) {
2211 log_error("%s already exists and is neither a symlink nor a directory", p);
2212 return r;
2213 } else {
2214 log_error_errno(errno, "Failed to remove %s: %m", p);
2215 return -errno;
2216 }
2217 }
2218 } else if (r != -ENOENT) {
2219 log_error_errno(errno, "readlink(%s) failed: %m", p);
2220 return r;
2221 }
2222
2223 if (arg_link_journal == LINK_GUEST) {
2224
2225 if (symlink(q, p) < 0) {
2226 if (arg_link_journal_try) {
2227 log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
2228 return 0;
2229 } else {
2230 log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
2231 return -errno;
2232 }
2233 }
2234
2235 r = userns_mkdir(directory, p, 0755, 0, 0);
2236 if (r < 0)
2237 log_warning_errno(errno, "Failed to create directory %s: %m", q);
2238 return 0;
2239 }
2240
2241 if (arg_link_journal == LINK_HOST) {
2242 /* don't create parents here -- if the host doesn't have
2243 * permanent journal set up, don't force it here */
2244 r = mkdir(p, 0755);
2245 if (r < 0) {
2246 if (arg_link_journal_try) {
2247 log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
2248 return 0;
2249 } else {
2250 log_error_errno(errno, "Failed to create %s: %m", p);
2251 return r;
2252 }
2253 }
2254
2255 } else if (access(p, F_OK) < 0)
2256 return 0;
2257
2258 if (dir_is_empty(q) == 0)
2259 log_warning("%s is not empty, proceeding anyway.", q);
2260
2261 r = userns_mkdir(directory, p, 0755, 0, 0);
2262 if (r < 0) {
2263 log_error_errno(errno, "Failed to create %s: %m", q);
2264 return r;
2265 }
2266
2267 if (mount(p, q, NULL, MS_BIND, NULL) < 0)
2268 return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
2269
2270 return 0;
2271 }
2272
2273 static int drop_capabilities(void) {
2274 return capability_bounding_set_drop(~arg_retain, false);
2275 }
2276
2277 static int register_machine(pid_t pid, int local_ifindex) {
2278 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2279 _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
2280 int r;
2281
2282 if (!arg_register)
2283 return 0;
2284
2285 r = sd_bus_default_system(&bus);
2286 if (r < 0)
2287 return log_error_errno(r, "Failed to open system bus: %m");
2288
2289 if (arg_keep_unit) {
2290 r = sd_bus_call_method(
2291 bus,
2292 "org.freedesktop.machine1",
2293 "/org/freedesktop/machine1",
2294 "org.freedesktop.machine1.Manager",
2295 "RegisterMachineWithNetwork",
2296 &error,
2297 NULL,
2298 "sayssusai",
2299 arg_machine,
2300 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
2301 "nspawn",
2302 "container",
2303 (uint32_t) pid,
2304 strempty(arg_directory),
2305 local_ifindex > 0 ? 1 : 0, local_ifindex);
2306 } else {
2307 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
2308 char **i;
2309 unsigned j;
2310
2311 r = sd_bus_message_new_method_call(
2312 bus,
2313 &m,
2314 "org.freedesktop.machine1",
2315 "/org/freedesktop/machine1",
2316 "org.freedesktop.machine1.Manager",
2317 "CreateMachineWithNetwork");
2318 if (r < 0)
2319 return bus_log_create_error(r);
2320
2321 r = sd_bus_message_append(
2322 m,
2323 "sayssusai",
2324 arg_machine,
2325 SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
2326 "nspawn",
2327 "container",
2328 (uint32_t) pid,
2329 strempty(arg_directory),
2330 local_ifindex > 0 ? 1 : 0, local_ifindex);
2331 if (r < 0)
2332 return bus_log_create_error(r);
2333
2334 r = sd_bus_message_open_container(m, 'a', "(sv)");
2335 if (r < 0)
2336 return bus_log_create_error(r);
2337
2338 if (!isempty(arg_slice)) {
2339 r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);
2340 if (r < 0)
2341 return bus_log_create_error(r);
2342 }
2343
2344 r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
2345 if (r < 0)
2346 return bus_log_create_error(r);
2347
2348 /* If you make changes here, also make sure to update
2349 * systemd-nspawn@.service, to keep the device
2350 * policies in sync regardless if we are run with or
2351 * without the --keep-unit switch. */
2352 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
2353 /* Allow the container to
2354 * access and create the API
2355 * device nodes, so that
2356 * PrivateDevices= in the
2357 * container can work
2358 * fine */
2359 "/dev/null", "rwm",
2360 "/dev/zero", "rwm",
2361 "/dev/full", "rwm",
2362 "/dev/random", "rwm",
2363 "/dev/urandom", "rwm",
2364 "/dev/tty", "rwm",
2365 "/dev/net/tun", "rwm",
2366 /* Allow the container
2367 * access to ptys. However,
2368 * do not permit the
2369 * container to ever create
2370 * these device nodes. */
2371 "/dev/pts/ptmx", "rw",
2372 "char-pts", "rw");
2373 if (r < 0)
2374 return bus_log_create_error(r);
2375
2376 for (j = 0; j < arg_n_custom_mounts; j++) {
2377 CustomMount *cm = &arg_custom_mounts[j];
2378
2379 if (cm->type != CUSTOM_MOUNT_BIND)
2380 continue;
2381
2382 r = is_device_node(cm->source);
2383 if (r < 0)
2384 return log_error_errno(r, "Failed to stat %s: %m", cm->source);
2385
2386 if (r) {
2387 r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 1,
2388 cm->source, cm->read_only ? "r" : "rw");
2389 if (r < 0)
2390 return log_error_errno(r, "Failed to append message arguments: %m");
2391 }
2392 }
2393
2394 if (arg_kill_signal != 0) {
2395 r = sd_bus_message_append(m, "(sv)", "KillSignal", "i", arg_kill_signal);
2396 if (r < 0)
2397 return bus_log_create_error(r);
2398
2399 r = sd_bus_message_append(m, "(sv)", "KillMode", "s", "mixed");
2400 if (r < 0)
2401 return bus_log_create_error(r);
2402 }
2403
2404 STRV_FOREACH(i, arg_property) {
2405 r = sd_bus_message_open_container(m, 'r', "sv");
2406 if (r < 0)
2407 return bus_log_create_error(r);
2408
2409 r = bus_append_unit_property_assignment(m, *i);
2410 if (r < 0)
2411 return r;
2412
2413 r = sd_bus_message_close_container(m);
2414 if (r < 0)
2415 return bus_log_create_error(r);
2416 }
2417
2418 r = sd_bus_message_close_container(m);
2419 if (r < 0)
2420 return bus_log_create_error(r);
2421
2422 r = sd_bus_call(bus, m, 0, &error, NULL);
2423 }
2424
2425 if (r < 0) {
2426 log_error("Failed to register machine: %s", bus_error_message(&error, r));
2427 return r;
2428 }
2429
2430 return 0;
2431 }
2432
2433 static int terminate_machine(pid_t pid) {
2434 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
2435 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
2436 _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
2437 const char *path;
2438 int r;
2439
2440 if (!arg_register)
2441 return 0;
2442
2443 /* If we are reusing the unit, then just exit, systemd will do
2444 * the right thing when we exit. */
2445 if (arg_keep_unit)
2446 return 0;
2447
2448 r = sd_bus_default_system(&bus);
2449 if (r < 0)
2450 return log_error_errno(r, "Failed to open system bus: %m");
2451
2452 r = sd_bus_call_method(
2453 bus,
2454 "org.freedesktop.machine1",
2455 "/org/freedesktop/machine1",
2456 "org.freedesktop.machine1.Manager",
2457 "GetMachineByPID",
2458 &error,
2459 &reply,
2460 "u",
2461 (uint32_t) pid);
2462 if (r < 0) {
2463 /* Note that the machine might already have been
2464 * cleaned up automatically, hence don't consider it a
2465 * failure if we cannot get the machine object. */
2466 log_debug("Failed to get machine: %s", bus_error_message(&error, r));
2467 return 0;
2468 }
2469
2470 r = sd_bus_message_read(reply, "o", &path);
2471 if (r < 0)
2472 return bus_log_parse_error(r);
2473
2474 r = sd_bus_call_method(
2475 bus,
2476 "org.freedesktop.machine1",
2477 path,
2478 "org.freedesktop.machine1.Machine",
2479 "Terminate",
2480 &error,
2481 NULL,
2482 NULL);
2483 if (r < 0) {
2484 log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
2485 return 0;
2486 }
2487
2488 return 0;
2489 }
2490
2491 static int reset_audit_loginuid(void) {
2492 _cleanup_free_ char *p = NULL;
2493 int r;
2494
2495 if (arg_share_system)
2496 return 0;
2497
2498 r = read_one_line_file("/proc/self/loginuid", &p);
2499 if (r == -ENOENT)
2500 return 0;
2501 if (r < 0)
2502 return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
2503
2504 /* Already reset? */
2505 if (streq(p, "4294967295"))
2506 return 0;
2507
2508 r = write_string_file("/proc/self/loginuid", "4294967295", 0);
2509 if (r < 0) {
2510 log_error_errno(r,
2511 "Failed to reset audit login UID. This probably means that your kernel is too\n"
2512 "old and you have audit enabled. Note that the auditing subsystem is known to\n"
2513 "be incompatible with containers on old kernels. Please make sure to upgrade\n"
2514 "your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
2515 "using systemd-nspawn. Sleeping for 5s... (%m)");
2516
2517 sleep(5);
2518 }
2519
2520 return 0;
2521 }
2522
2523 #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
2524 #define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
2525 #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
2526
2527 static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, uint64_t idx) {
2528 uint8_t result[8];
2529 size_t l, sz;
2530 uint8_t *v, *i;
2531 int r;
2532
2533 l = strlen(arg_machine);
2534 sz = sizeof(sd_id128_t) + l;
2535 if (idx > 0)
2536 sz += sizeof(idx);
2537
2538 v = alloca(sz);
2539
2540 /* fetch some persistent data unique to the host */
2541 r = sd_id128_get_machine((sd_id128_t*) v);
2542 if (r < 0)
2543 return r;
2544
2545 /* combine with some data unique (on this host) to this
2546 * container instance */
2547 i = mempcpy(v + sizeof(sd_id128_t), arg_machine, l);
2548 if (idx > 0) {
2549 idx = htole64(idx);
2550 memcpy(i, &idx, sizeof(idx));
2551 }
2552
2553 /* Let's hash the host machine ID plus the container name. We
2554 * use a fixed, but originally randomly created hash key here. */
2555 siphash24(result, v, sz, hash_key.bytes);
2556
2557 assert_cc(ETH_ALEN <= sizeof(result));
2558 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
2559
2560 /* see eth_random_addr in the kernel */
2561 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
2562 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
2563
2564 return 0;
2565 }
2566
2567 static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) {
2568 _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
2569 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2570 struct ether_addr mac_host, mac_container;
2571 int r, i;
2572
2573 if (!arg_private_network)
2574 return 0;
2575
2576 if (!arg_network_veth)
2577 return 0;
2578
2579 /* Use two different interface name prefixes depending whether
2580 * we are in bridge mode or not. */
2581 snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
2582 arg_network_bridge ? "vb" : "ve", arg_machine);
2583
2584 r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0);
2585 if (r < 0)
2586 return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
2587
2588 r = generate_mac(&mac_host, HOST_HASH_KEY, 0);
2589 if (r < 0)
2590 return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
2591
2592 r = sd_netlink_open(&rtnl);
2593 if (r < 0)
2594 return log_error_errno(r, "Failed to connect to netlink: %m");
2595
2596 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
2597 if (r < 0)
2598 return log_error_errno(r, "Failed to allocate netlink message: %m");
2599
2600 r = sd_netlink_message_append_string(m, IFLA_IFNAME, iface_name);
2601 if (r < 0)
2602 return log_error_errno(r, "Failed to add netlink interface name: %m");
2603
2604 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
2605 if (r < 0)
2606 return log_error_errno(r, "Failed to add netlink MAC address: %m");
2607
2608 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2609 if (r < 0)
2610 return log_error_errno(r, "Failed to open netlink container: %m");
2611
2612 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
2613 if (r < 0)
2614 return log_error_errno(r, "Failed to open netlink container: %m");
2615
2616 r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
2617 if (r < 0)
2618 return log_error_errno(r, "Failed to open netlink container: %m");
2619
2620 r = sd_netlink_message_append_string(m, IFLA_IFNAME, "host0");
2621 if (r < 0)
2622 return log_error_errno(r, "Failed to add netlink interface name: %m");
2623
2624 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
2625 if (r < 0)
2626 return log_error_errno(r, "Failed to add netlink MAC address: %m");
2627
2628 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
2629 if (r < 0)
2630 return log_error_errno(r, "Failed to add netlink namespace field: %m");
2631
2632 r = sd_netlink_message_close_container(m);
2633 if (r < 0)
2634 return log_error_errno(r, "Failed to close netlink container: %m");
2635
2636 r = sd_netlink_message_close_container(m);
2637 if (r < 0)
2638 return log_error_errno(r, "Failed to close netlink container: %m");
2639
2640 r = sd_netlink_message_close_container(m);
2641 if (r < 0)
2642 return log_error_errno(r, "Failed to close netlink container: %m");
2643
2644 r = sd_netlink_call(rtnl, m, 0, NULL);
2645 if (r < 0)
2646 return log_error_errno(r, "Failed to add new veth interfaces (host0, %s): %m", iface_name);
2647
2648 i = (int) if_nametoindex(iface_name);
2649 if (i <= 0)
2650 return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
2651
2652 *ifi = i;
2653
2654 return 0;
2655 }
2656
2657 static int setup_bridge(const char veth_name[], int *ifi) {
2658 _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
2659 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2660 int r, bridge;
2661
2662 if (!arg_private_network)
2663 return 0;
2664
2665 if (!arg_network_veth)
2666 return 0;
2667
2668 if (!arg_network_bridge)
2669 return 0;
2670
2671 bridge = (int) if_nametoindex(arg_network_bridge);
2672 if (bridge <= 0)
2673 return log_error_errno(errno, "Failed to resolve interface %s: %m", arg_network_bridge);
2674
2675 *ifi = bridge;
2676
2677 r = sd_netlink_open(&rtnl);
2678 if (r < 0)
2679 return log_error_errno(r, "Failed to connect to netlink: %m");
2680
2681 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
2682 if (r < 0)
2683 return log_error_errno(r, "Failed to allocate netlink message: %m");
2684
2685 r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
2686 if (r < 0)
2687 return log_error_errno(r, "Failed to set IFF_UP flag: %m");
2688
2689 r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
2690 if (r < 0)
2691 return log_error_errno(r, "Failed to add netlink interface name field: %m");
2692
2693 r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge);
2694 if (r < 0)
2695 return log_error_errno(r, "Failed to add netlink master field: %m");
2696
2697 r = sd_netlink_call(rtnl, m, 0, NULL);
2698 if (r < 0)
2699 return log_error_errno(r, "Failed to add veth interface to bridge: %m");
2700
2701 return 0;
2702 }
2703
2704 static int parse_interface(struct udev *udev, const char *name) {
2705 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
2706 char ifi_str[2 + DECIMAL_STR_MAX(int)];
2707 int ifi;
2708
2709 ifi = (int) if_nametoindex(name);
2710 if (ifi <= 0)
2711 return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
2712
2713 sprintf(ifi_str, "n%i", ifi);
2714 d = udev_device_new_from_device_id(udev, ifi_str);
2715 if (!d)
2716 return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
2717
2718 if (udev_device_get_is_initialized(d) <= 0) {
2719 log_error("Network interface %s is not initialized yet.", name);
2720 return -EBUSY;
2721 }
2722
2723 return ifi;
2724 }
2725
2726 static int move_network_interfaces(pid_t pid) {
2727 _cleanup_udev_unref_ struct udev *udev = NULL;
2728 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2729 char **i;
2730 int r;
2731
2732 if (!arg_private_network)
2733 return 0;
2734
2735 if (strv_isempty(arg_network_interfaces))
2736 return 0;
2737
2738 r = sd_netlink_open(&rtnl);
2739 if (r < 0)
2740 return log_error_errno(r, "Failed to connect to netlink: %m");
2741
2742 udev = udev_new();
2743 if (!udev) {
2744 log_error("Failed to connect to udev.");
2745 return -ENOMEM;
2746 }
2747
2748 STRV_FOREACH(i, arg_network_interfaces) {
2749 _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
2750 int ifi;
2751
2752 ifi = parse_interface(udev, *i);
2753 if (ifi < 0)
2754 return ifi;
2755
2756 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
2757 if (r < 0)
2758 return log_error_errno(r, "Failed to allocate netlink message: %m");
2759
2760 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
2761 if (r < 0)
2762 return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
2763
2764 r = sd_netlink_call(rtnl, m, 0, NULL);
2765 if (r < 0)
2766 return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
2767 }
2768
2769 return 0;
2770 }
2771
2772 static int setup_macvlan(pid_t pid) {
2773 _cleanup_udev_unref_ struct udev *udev = NULL;
2774 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2775 unsigned idx = 0;
2776 char **i;
2777 int r;
2778
2779 if (!arg_private_network)
2780 return 0;
2781
2782 if (strv_isempty(arg_network_macvlan))
2783 return 0;
2784
2785 r = sd_netlink_open(&rtnl);
2786 if (r < 0)
2787 return log_error_errno(r, "Failed to connect to netlink: %m");
2788
2789 udev = udev_new();
2790 if (!udev) {
2791 log_error("Failed to connect to udev.");
2792 return -ENOMEM;
2793 }
2794
2795 STRV_FOREACH(i, arg_network_macvlan) {
2796 _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
2797 _cleanup_free_ char *n = NULL;
2798 struct ether_addr mac;
2799 int ifi;
2800
2801 ifi = parse_interface(udev, *i);
2802 if (ifi < 0)
2803 return ifi;
2804
2805 r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++);
2806 if (r < 0)
2807 return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
2808
2809 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
2810 if (r < 0)
2811 return log_error_errno(r, "Failed to allocate netlink message: %m");
2812
2813 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
2814 if (r < 0)
2815 return log_error_errno(r, "Failed to add netlink interface index: %m");
2816
2817 n = strappend("mv-", *i);
2818 if (!n)
2819 return log_oom();
2820
2821 strshorten(n, IFNAMSIZ-1);
2822
2823 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
2824 if (r < 0)
2825 return log_error_errno(r, "Failed to add netlink interface name: %m");
2826
2827 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
2828 if (r < 0)
2829 return log_error_errno(r, "Failed to add netlink MAC address: %m");
2830
2831 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
2832 if (r < 0)
2833 return log_error_errno(r, "Failed to add netlink namespace field: %m");
2834
2835 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2836 if (r < 0)
2837 return log_error_errno(r, "Failed to open netlink container: %m");
2838
2839 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
2840 if (r < 0)
2841 return log_error_errno(r, "Failed to open netlink container: %m");
2842
2843 r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
2844 if (r < 0)
2845 return log_error_errno(r, "Failed to append macvlan mode: %m");
2846
2847 r = sd_netlink_message_close_container(m);
2848 if (r < 0)
2849 return log_error_errno(r, "Failed to close netlink container: %m");
2850
2851 r = sd_netlink_message_close_container(m);
2852 if (r < 0)
2853 return log_error_errno(r, "Failed to close netlink container: %m");
2854
2855 r = sd_netlink_call(rtnl, m, 0, NULL);
2856 if (r < 0)
2857 return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
2858 }
2859
2860 return 0;
2861 }
2862
2863 static int setup_ipvlan(pid_t pid) {
2864 _cleanup_udev_unref_ struct udev *udev = NULL;
2865 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
2866 char **i;
2867 int r;
2868
2869 if (!arg_private_network)
2870 return 0;
2871
2872 if (strv_isempty(arg_network_ipvlan))
2873 return 0;
2874
2875 r = sd_netlink_open(&rtnl);
2876 if (r < 0)
2877 return log_error_errno(r, "Failed to connect to netlink: %m");
2878
2879 udev = udev_new();
2880 if (!udev) {
2881 log_error("Failed to connect to udev.");
2882 return -ENOMEM;
2883 }
2884
2885 STRV_FOREACH(i, arg_network_ipvlan) {
2886 _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
2887 _cleanup_free_ char *n = NULL;
2888 int ifi;
2889
2890 ifi = parse_interface(udev, *i);
2891 if (ifi < 0)
2892 return ifi;
2893
2894 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
2895 if (r < 0)
2896 return log_error_errno(r, "Failed to allocate netlink message: %m");
2897
2898 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
2899 if (r < 0)
2900 return log_error_errno(r, "Failed to add netlink interface index: %m");
2901
2902 n = strappend("iv-", *i);
2903 if (!n)
2904 return log_oom();
2905
2906 strshorten(n, IFNAMSIZ-1);
2907
2908 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
2909 if (r < 0)
2910 return log_error_errno(r, "Failed to add netlink interface name: %m");
2911
2912 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
2913 if (r < 0)
2914 return log_error_errno(r, "Failed to add netlink namespace field: %m");
2915
2916 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
2917 if (r < 0)
2918 return log_error_errno(r, "Failed to open netlink container: %m");
2919
2920 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
2921 if (r < 0)
2922 return log_error_errno(r, "Failed to open netlink container: %m");
2923
2924 r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
2925 if (r < 0)
2926 return log_error_errno(r, "Failed to add ipvlan mode: %m");
2927
2928 r = sd_netlink_message_close_container(m);
2929 if (r < 0)
2930 return log_error_errno(r, "Failed to close netlink container: %m");
2931
2932 r = sd_netlink_message_close_container(m);
2933 if (r < 0)
2934 return log_error_errno(r, "Failed to close netlink container: %m");
2935
2936 r = sd_netlink_call(rtnl, m, 0, NULL);
2937 if (r < 0)
2938 return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
2939 }
2940
2941 return 0;
2942 }
2943
2944 static int setup_seccomp(void) {
2945
2946 #ifdef HAVE_SECCOMP
2947 static const struct {
2948 uint64_t capability;
2949 int syscall_num;
2950 } blacklist[] = {
2951 { CAP_SYS_RAWIO, SCMP_SYS(iopl) },
2952 { CAP_SYS_RAWIO, SCMP_SYS(ioperm) },
2953 { CAP_SYS_BOOT, SCMP_SYS(kexec_load) },
2954 { CAP_SYS_ADMIN, SCMP_SYS(swapon) },
2955 { CAP_SYS_ADMIN, SCMP_SYS(swapoff) },
2956 { CAP_SYS_ADMIN, SCMP_SYS(open_by_handle_at) },
2957 { CAP_SYS_MODULE, SCMP_SYS(init_module) },
2958 { CAP_SYS_MODULE, SCMP_SYS(finit_module) },
2959 { CAP_SYS_MODULE, SCMP_SYS(delete_module) },
2960 { CAP_SYSLOG, SCMP_SYS(syslog) },
2961 };
2962
2963 scmp_filter_ctx seccomp;
2964 unsigned i;
2965 int r;
2966
2967 seccomp = seccomp_init(SCMP_ACT_ALLOW);
2968 if (!seccomp)
2969 return log_oom();
2970
2971 r = seccomp_add_secondary_archs(seccomp);
2972 if (r < 0) {
2973 log_error_errno(r, "Failed to add secondary archs to seccomp filter: %m");
2974 goto finish;
2975 }
2976
2977 for (i = 0; i < ELEMENTSOF(blacklist); i++) {
2978 if (arg_retain & (1ULL << blacklist[i].capability))
2979 continue;
2980
2981 r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i].syscall_num, 0);
2982 if (r == -EFAULT)
2983 continue; /* unknown syscall */
2984 if (r < 0) {
2985 log_error_errno(r, "Failed to block syscall: %m");
2986 goto finish;
2987 }
2988 }
2989
2990
2991 /*
2992 Audit is broken in containers, much of the userspace audit
2993 hookup will fail if running inside a container. We don't
2994 care and just turn off creation of audit sockets.
2995
2996 This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
2997 with EAFNOSUPPORT which audit userspace uses as indication
2998 that audit is disabled in the kernel.
2999 */
3000
3001 r = seccomp_rule_add(
3002 seccomp,
3003 SCMP_ACT_ERRNO(EAFNOSUPPORT),
3004 SCMP_SYS(socket),
3005 2,
3006 SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),
3007 SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));
3008 if (r < 0) {
3009 log_error_errno(r, "Failed to add audit seccomp rule: %m");
3010 goto finish;
3011 }
3012
3013 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
3014 if (r < 0) {
3015 log_error_errno(r, "Failed to unset NO_NEW_PRIVS: %m");
3016 goto finish;
3017 }
3018
3019 r = seccomp_load(seccomp);
3020 if (r == -EINVAL) {
3021 log_debug_errno(r, "Kernel is probably not configured with CONFIG_SECCOMP. Disabling seccomp audit filter: %m");
3022 r = 0;
3023 goto finish;
3024 }
3025 if (r < 0) {
3026 log_error_errno(r, "Failed to install seccomp audit filter: %m");
3027 goto finish;
3028 }
3029
3030 finish:
3031 seccomp_release(seccomp);
3032 return r;
3033 #else
3034 return 0;
3035 #endif
3036
3037 }
3038
3039 static int setup_propagate(const char *root) {
3040 const char *p, *q;
3041
3042 (void) mkdir_p("/run/systemd/nspawn/", 0755);
3043 (void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
3044 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
3045 (void) mkdir_p(p, 0600);
3046
3047 if (userns_mkdir(root, "/run/systemd", 0755, 0, 0) < 0)
3048 return log_error_errno(errno, "Failed to create /run/systemd: %m");
3049
3050 if (userns_mkdir(root, "/run/systemd/nspawn", 0755, 0, 0) < 0)
3051 return log_error_errno(errno, "Failed to create /run/systemd/nspawn: %m");
3052
3053 if (userns_mkdir(root, "/run/systemd/nspawn/incoming", 0600, 0, 0) < 0)
3054 return log_error_errno(errno, "Failed to create /run/systemd/nspawn/incoming: %m");
3055
3056 q = prefix_roota(root, "/run/systemd/nspawn/incoming");
3057 if (mount(p, q, NULL, MS_BIND, NULL) < 0)
3058 return log_error_errno(errno, "Failed to install propagation bind mount.");
3059
3060 if (mount(NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0)
3061 return log_error_errno(errno, "Failed to make propagation mount read-only");
3062
3063 return 0;
3064 }
3065
3066 static int setup_image(char **device_path, int *loop_nr) {
3067 struct loop_info64 info = {
3068 .lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN
3069 };
3070 _cleanup_close_ int fd = -1, control = -1, loop = -1;
3071 _cleanup_free_ char* loopdev = NULL;
3072 struct stat st;
3073 int r, nr;
3074
3075 assert(device_path);
3076 assert(loop_nr);
3077 assert(arg_image);
3078
3079 fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
3080 if (fd < 0)
3081 return log_error_errno(errno, "Failed to open %s: %m", arg_image);
3082
3083 if (fstat(fd, &st) < 0)
3084 return log_error_errno(errno, "Failed to stat %s: %m", arg_image);
3085
3086 if (S_ISBLK(st.st_mode)) {
3087 char *p;
3088
3089 p = strdup(arg_image);
3090 if (!p)
3091 return log_oom();
3092
3093 *device_path = p;
3094
3095 *loop_nr = -1;
3096
3097 r = fd;
3098 fd = -1;
3099
3100 return r;
3101 }
3102
3103 if (!S_ISREG(st.st_mode)) {
3104 log_error_errno(errno, "%s is not a regular file or block device: %m", arg_image);
3105 return -EINVAL;
3106 }
3107
3108 control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
3109 if (control < 0)
3110 return log_error_errno(errno, "Failed to open /dev/loop-control: %m");
3111
3112 nr = ioctl(control, LOOP_CTL_GET_FREE);
3113 if (nr < 0)
3114 return log_error_errno(errno, "Failed to allocate loop device: %m");
3115
3116 if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)
3117 return log_oom();
3118
3119 loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
3120 if (loop < 0)
3121 return log_error_errno(errno, "Failed to open loop device %s: %m", loopdev);
3122
3123 if (ioctl(loop, LOOP_SET_FD, fd) < 0)
3124 return log_error_errno(errno, "Failed to set loopback file descriptor on %s: %m", loopdev);
3125
3126 if (arg_read_only)
3127 info.lo_flags |= LO_FLAGS_READ_ONLY;
3128
3129 if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0)
3130 return log_error_errno(errno, "Failed to set loopback settings on %s: %m", loopdev);
3131
3132 *device_path = loopdev;
3133 loopdev = NULL;
3134
3135 *loop_nr = nr;
3136
3137 r = loop;
3138 loop = -1;
3139
3140 return r;
3141 }
3142
3143 #define PARTITION_TABLE_BLURB \
3144 "Note that the disk image needs to either contain only a single MBR partition of\n" \
3145 "type 0x83 that is marked bootable, or a single GPT partition of type " \
3146 "0FC63DAF-8483-4772-8E79-3D69D8477DE4 or follow\n" \
3147 " http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/\n" \
3148 "to be bootable with systemd-nspawn."
3149
3150 static int dissect_image(
3151 int fd,
3152 char **root_device, bool *root_device_rw,
3153 char **home_device, bool *home_device_rw,
3154 char **srv_device, bool *srv_device_rw,
3155 bool *secondary) {
3156
3157 #ifdef HAVE_BLKID
3158 int home_nr = -1, srv_nr = -1;
3159 #ifdef GPT_ROOT_NATIVE
3160 int root_nr = -1;
3161 #endif
3162 #ifdef GPT_ROOT_SECONDARY
3163 int secondary_root_nr = -1;
3164 #endif
3165 _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL, *generic = NULL;
3166 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
3167 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
3168 _cleanup_blkid_free_probe_ blkid_probe b = NULL;
3169 _cleanup_udev_unref_ struct udev *udev = NULL;
3170 struct udev_list_entry *first, *item;
3171 bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true, generic_rw = true;
3172 bool is_gpt, is_mbr, multiple_generic = false;
3173 const char *pttype = NULL;
3174 blkid_partlist pl;
3175 struct stat st;
3176 unsigned i;
3177 int r;
3178
3179 assert(fd >= 0);
3180 assert(root_device);
3181 assert(home_device);
3182 assert(srv_device);
3183 assert(secondary);
3184 assert(arg_image);
3185
3186 b = blkid_new_probe();
3187 if (!b)
3188 return log_oom();
3189
3190 errno = 0;
3191 r = blkid_probe_set_device(b, fd, 0, 0);
3192 if (r != 0) {
3193 if (errno == 0)
3194 return log_oom();
3195
3196 log_error_errno(errno, "Failed to set device on blkid probe: %m");
3197 return -errno;
3198 }
3199
3200 blkid_probe_enable_partitions(b, 1);
3201 blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
3202
3203 errno = 0;
3204 r = blkid_do_safeprobe(b);
3205 if (r == -2 || r == 1) {
3206 log_error("Failed to identify any partition table on\n"
3207 " %s\n"
3208 PARTITION_TABLE_BLURB, arg_image);
3209 return -EINVAL;
3210 } else if (r != 0) {
3211 if (errno == 0)
3212 errno = EIO;
3213 log_error_errno(errno, "Failed to probe: %m");
3214 return -errno;
3215 }
3216
3217 (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
3218
3219 is_gpt = streq_ptr(pttype, "gpt");
3220 is_mbr = streq_ptr(pttype, "dos");
3221
3222 if (!is_gpt && !is_mbr) {
3223 log_error("No GPT or MBR partition table discovered on\n"
3224 " %s\n"
3225 PARTITION_TABLE_BLURB, arg_image);
3226 return -EINVAL;
3227 }
3228
3229 errno = 0;
3230 pl = blkid_probe_get_partitions(b);
3231 if (!pl) {
3232 if (errno == 0)
3233 return log_oom();
3234
3235 log_error("Failed to list partitions of %s", arg_image);
3236 return -errno;
3237 }
3238
3239 udev = udev_new();
3240 if (!udev)
3241 return log_oom();
3242
3243 if (fstat(fd, &st) < 0)
3244 return log_error_errno(errno, "Failed to stat block device: %m");
3245
3246 d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
3247 if (!d)
3248 return log_oom();
3249
3250 for (i = 0;; i++) {
3251 int n, m;
3252
3253 if (i >= 10) {
3254 log_error("Kernel partitions never appeared.");
3255 return -ENXIO;
3256 }
3257
3258 e = udev_enumerate_new(udev);
3259 if (!e)
3260 return log_oom();
3261
3262 r = udev_enumerate_add_match_parent(e, d);
3263 if (r < 0)
3264 return log_oom();
3265
3266 r = udev_enumerate_scan_devices(e);
3267 if (r < 0)
3268 return log_error_errno(r, "Failed to scan for partition devices of %s: %m", arg_image);
3269
3270 /* Count the partitions enumerated by the kernel */
3271 n = 0;
3272 first = udev_enumerate_get_list_entry(e);
3273 udev_list_entry_foreach(item, first)
3274 n++;
3275
3276 /* Count the partitions enumerated by blkid */
3277 m = blkid_partlist_numof_partitions(pl);
3278 if (n == m + 1)
3279 break;
3280 if (n > m + 1) {
3281 log_error("blkid and kernel partition list do not match.");
3282 return -EIO;
3283 }
3284 if (n < m + 1) {
3285 unsigned j;
3286
3287 /* The kernel has probed fewer partitions than
3288 * blkid? Maybe the kernel prober is still
3289 * running or it got EBUSY because udev
3290 * already opened the device. Let's reprobe
3291 * the device, which is a synchronous call
3292 * that waits until probing is complete. */
3293
3294 for (j = 0; j < 20; j++) {
3295
3296 r = ioctl(fd, BLKRRPART, 0);
3297 if (r < 0)
3298 r = -errno;
3299 if (r >= 0 || r != -EBUSY)
3300 break;
3301
3302 /* If something else has the device
3303 * open, such as an udev rule, the
3304 * ioctl will return EBUSY. Since
3305 * there's no way to wait until it
3306 * isn't busy anymore, let's just wait
3307 * a bit, and try again.
3308 *
3309 * This is really something they
3310 * should fix in the kernel! */
3311
3312 usleep(50 * USEC_PER_MSEC);
3313 }
3314
3315 if (r < 0)
3316 return log_error_errno(r, "Failed to reread partition table: %m");
3317 }
3318
3319 e = udev_enumerate_unref(e);
3320 }
3321
3322 first = udev_enumerate_get_list_entry(e);
3323 udev_list_entry_foreach(item, first) {
3324 _cleanup_udev_device_unref_ struct udev_device *q;
3325 const char *node;
3326 unsigned long long flags;
3327 blkid_partition pp;
3328 dev_t qn;
3329 int nr;
3330
3331 errno = 0;
3332 q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
3333 if (!q) {
3334 if (!errno)
3335 errno = ENOMEM;
3336
3337 log_error_errno(errno, "Failed to get partition device of %s: %m", arg_image);
3338 return -errno;
3339 }
3340
3341 qn = udev_device_get_devnum(q);
3342 if (major(qn) == 0)
3343 continue;
3344
3345 if (st.st_rdev == qn)
3346 continue;
3347
3348 node = udev_device_get_devnode(q);
3349 if (!node)
3350 continue;
3351
3352 pp = blkid_partlist_devno_to_partition(pl, qn);
3353 if (!pp)
3354 continue;
3355
3356 flags = blkid_partition_get_flags(pp);
3357
3358 nr = blkid_partition_get_partno(pp);
3359 if (nr < 0)
3360 continue;
3361
3362 if (is_gpt) {
3363 sd_id128_t type_id;
3364 const char *stype;
3365
3366 if (flags & GPT_FLAG_NO_AUTO)
3367 continue;
3368
3369 stype = blkid_partition_get_type_string(pp);
3370 if (!stype)
3371 continue;
3372
3373 if (sd_id128_from_string(stype, &type_id) < 0)
3374 continue;
3375
3376 if (sd_id128_equal(type_id, GPT_HOME)) {
3377
3378 if (home && nr >= home_nr)
3379 continue;
3380
3381 home_nr = nr;
3382 home_rw = !(flags & GPT_FLAG_READ_ONLY);
3383
3384 r = free_and_strdup(&home, node);
3385 if (r < 0)
3386 return log_oom();
3387
3388 } else if (sd_id128_equal(type_id, GPT_SRV)) {
3389
3390 if (srv && nr >= srv_nr)
3391 continue;
3392
3393 srv_nr = nr;
3394 srv_rw = !(flags & GPT_FLAG_READ_ONLY);
3395
3396 r = free_and_strdup(&srv, node);
3397 if (r < 0)
3398 return log_oom();
3399 }
3400 #ifdef GPT_ROOT_NATIVE
3401 else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
3402
3403 if (root && nr >= root_nr)
3404 continue;
3405
3406 root_nr = nr;
3407 root_rw = !(flags & GPT_FLAG_READ_ONLY);
3408
3409 r = free_and_strdup(&root, node);
3410 if (r < 0)
3411 return log_oom();
3412 }
3413 #endif
3414 #ifdef GPT_ROOT_SECONDARY
3415 else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
3416
3417 if (secondary_root && nr >= secondary_root_nr)
3418 continue;
3419
3420 secondary_root_nr = nr;
3421 secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);
3422
3423 r = free_and_strdup(&secondary_root, node);
3424 if (r < 0)
3425 return log_oom();
3426 }
3427 #endif
3428 else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
3429
3430 if (generic)
3431 multiple_generic = true;
3432 else {
3433 generic_rw = !(flags & GPT_FLAG_READ_ONLY);
3434
3435 r = free_and_strdup(&generic, node);
3436 if (r < 0)
3437 return log_oom();
3438 }
3439 }
3440
3441 } else if (is_mbr) {
3442 int type;
3443
3444 if (flags != 0x80) /* Bootable flag */
3445 continue;
3446
3447 type = blkid_partition_get_type(pp);
3448 if (type != 0x83) /* Linux partition */
3449 continue;
3450
3451 if (generic)
3452 multiple_generic = true;
3453 else {
3454 generic_rw = true;
3455
3456 r = free_and_strdup(&root, node);
3457 if (r < 0)
3458 return log_oom();
3459 }
3460 }
3461 }
3462
3463 if (root) {
3464 *root_device = root;
3465 root = NULL;
3466
3467 *root_device_rw = root_rw;
3468 *secondary = false;
3469 } else if (secondary_root) {
3470 *root_device = secondary_root;
3471 secondary_root = NULL;
3472
3473 *root_device_rw = secondary_root_rw;
3474 *secondary = true;
3475 } else if (generic) {
3476
3477 /* There were no partitions with precise meanings
3478 * around, but we found generic partitions. In this
3479 * case, if there's only one, we can go ahead and boot
3480 * it, otherwise we bail out, because we really cannot
3481 * make any sense of it. */
3482
3483 if (multiple_generic) {
3484 log_error("Identified multiple bootable Linux partitions on\n"
3485 " %s\n"
3486 PARTITION_TABLE_BLURB, arg_image);
3487 return -EINVAL;
3488 }
3489
3490 *root_device = generic;
3491 generic = NULL;
3492
3493 *root_device_rw = generic_rw;
3494 *secondary = false;
3495 } else {
3496 log_error("Failed to identify root partition in disk image\n"
3497 " %s\n"
3498 PARTITION_TABLE_BLURB, arg_image);
3499 return -EINVAL;
3500 }
3501
3502 if (home) {
3503 *home_device = home;
3504 home = NULL;
3505
3506 *home_device_rw = home_rw;
3507 }
3508
3509 if (srv) {
3510 *srv_device = srv;
3511 srv = NULL;
3512
3513 *srv_device_rw = srv_rw;
3514 }
3515
3516 return 0;
3517 #else
3518 log_error("--image= is not supported, compiled without blkid support.");
3519 return -EOPNOTSUPP;
3520 #endif
3521 }
3522
3523 static int mount_device(const char *what, const char *where, const char *directory, bool rw) {
3524 #ifdef HAVE_BLKID
3525 _cleanup_blkid_free_probe_ blkid_probe b = NULL;
3526 const char *fstype, *p;
3527 int r;
3528
3529 assert(what);
3530 assert(where);
3531
3532 if (arg_read_only)
3533 rw = false;
3534
3535 if (directory)
3536 p = strjoina(where, directory);
3537 else
3538 p = where;
3539
3540 errno = 0;
3541 b = blkid_new_probe_from_filename(what);
3542 if (!b) {
3543 if (errno == 0)
3544 return log_oom();
3545 log_error_errno(errno, "Failed to allocate prober for %s: %m", what);
3546 return -errno;
3547 }
3548
3549 blkid_probe_enable_superblocks(b, 1);
3550 blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
3551
3552 errno = 0;
3553 r = blkid_do_safeprobe(b);
3554 if (r == -1 || r == 1) {
3555 log_error("Cannot determine file system type of %s", what);
3556 return -EINVAL;
3557 } else if (r != 0) {
3558 if (errno == 0)
3559 errno = EIO;
3560 log_error_errno(errno, "Failed to probe %s: %m", what);
3561 return -errno;
3562 }
3563
3564 errno = 0;
3565 if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {
3566 if (errno == 0)
3567 errno = EINVAL;
3568 log_error("Failed to determine file system type of %s", what);
3569 return -errno;
3570 }
3571
3572 if (streq(fstype, "crypto_LUKS")) {
3573 log_error("nspawn currently does not support LUKS disk images.");
3574 return -EOPNOTSUPP;
3575 }
3576
3577 if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0)
3578 return log_error_errno(errno, "Failed to mount %s: %m", what);
3579
3580 return 0;
3581 #else
3582 log_error("--image= is not supported, compiled without blkid support.");
3583 return -EOPNOTSUPP;
3584 #endif
3585 }
3586
3587 static int mount_devices(
3588 const char *where,
3589 const char *root_device, bool root_device_rw,
3590 const char *home_device, bool home_device_rw,
3591 const char *srv_device, bool srv_device_rw) {
3592 int r;
3593
3594 assert(where);
3595
3596 if (root_device) {
3597 r = mount_device(root_device, arg_directory, NULL, root_device_rw);
3598 if (r < 0)
3599 return log_error_errno(r, "Failed to mount root directory: %m");
3600 }
3601
3602 if (home_device) {
3603 r = mount_device(home_device, arg_directory, "/home", home_device_rw);
3604 if (r < 0)
3605 return log_error_errno(r, "Failed to mount home directory: %m");
3606 }
3607
3608 if (srv_device) {
3609 r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
3610 if (r < 0)
3611 return log_error_errno(r, "Failed to mount server data directory: %m");
3612 }
3613
3614 return 0;
3615 }
3616
3617 static void loop_remove(int nr, int *image_fd) {
3618 _cleanup_close_ int control = -1;
3619 int r;
3620
3621 if (nr < 0)
3622 return;
3623
3624 if (image_fd && *image_fd >= 0) {
3625 r = ioctl(*image_fd, LOOP_CLR_FD);
3626 if (r < 0)
3627 log_debug_errno(errno, "Failed to close loop image: %m");
3628 *image_fd = safe_close(*image_fd);
3629 }
3630
3631 control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
3632 if (control < 0) {
3633 log_warning_errno(errno, "Failed to open /dev/loop-control: %m");
3634 return;
3635 }
3636
3637 r = ioctl(control, LOOP_CTL_REMOVE, nr);
3638 if (r < 0)
3639 log_debug_errno(errno, "Failed to remove loop %d: %m", nr);
3640 }
3641
3642 static int spawn_getent(const char *database, const char *key, pid_t *rpid) {
3643 int pipe_fds[2];
3644 pid_t pid;
3645
3646 assert(database);
3647 assert(key);
3648 assert(rpid);
3649
3650 if (pipe2(pipe_fds, O_CLOEXEC) < 0)
3651 return log_error_errno(errno, "Failed to allocate pipe: %m");
3652
3653 pid = fork();
3654 if (pid < 0)
3655 return log_error_errno(errno, "Failed to fork getent child: %m");
3656 else if (pid == 0) {
3657 int nullfd;
3658 char *empty_env = NULL;
3659
3660 if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)
3661 _exit(EXIT_FAILURE);
3662
3663 if (pipe_fds[0] > 2)
3664 safe_close(pipe_fds[0]);
3665 if (pipe_fds[1] > 2)
3666 safe_close(pipe_fds[1]);
3667
3668 nullfd = open("/dev/null", O_RDWR);
3669 if (nullfd < 0)
3670 _exit(EXIT_FAILURE);
3671
3672 if (dup3(nullfd, STDIN_FILENO, 0) < 0)
3673 _exit(EXIT_FAILURE);
3674
3675 if (dup3(nullfd, STDERR_FILENO, 0) < 0)
3676 _exit(EXIT_FAILURE);
3677
3678 if (nullfd > 2)
3679 safe_close(nullfd);
3680
3681 (void) reset_all_signal_handlers();
3682 (void) reset_signal_mask();
3683 close_all_fds(NULL, 0);
3684
3685 execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);
3686 execle("/bin/getent", "getent", database, key, NULL, &empty_env);
3687 _exit(EXIT_FAILURE);
3688 }
3689
3690 pipe_fds[1] = safe_close(pipe_fds[1]);
3691
3692 *rpid = pid;
3693
3694 return pipe_fds[0];
3695 }
3696
3697 static int change_uid_gid(char **_home) {
3698 char line[LINE_MAX], *x, *u, *g, *h;
3699 const char *word, *state;
3700 _cleanup_free_ uid_t *uids = NULL;
3701 _cleanup_free_ char *home = NULL;
3702 _cleanup_fclose_ FILE *f = NULL;
3703 _cleanup_close_ int fd = -1;
3704 unsigned n_uids = 0;
3705 size_t sz = 0, l;
3706 uid_t uid;
3707 gid_t gid;
3708 pid_t pid;
3709 int r;
3710
3711 assert(_home);
3712
3713 if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {
3714 /* Reset everything fully to 0, just in case */
3715
3716 r = reset_uid_gid();
3717 if (r < 0)
3718 return log_error_errno(r, "Failed to become root: %m");
3719
3720 *_home = NULL;
3721 return 0;
3722 }
3723
3724 /* First, get user credentials */
3725 fd = spawn_getent("passwd", arg_user, &pid);
3726 if (fd < 0)
3727 return fd;
3728
3729 f = fdopen(fd, "r");
3730 if (!f)
3731 return log_oom();
3732 fd = -1;
3733
3734 if (!fgets(line, sizeof(line), f)) {
3735
3736 if (!ferror(f)) {
3737 log_error("Failed to resolve user %s.", arg_user);
3738 return -ESRCH;
3739 }
3740
3741 log_error_errno(errno, "Failed to read from getent: %m");
3742 return -errno;
3743 }
3744
3745 truncate_nl(line);
3746
3747 wait_for_terminate_and_warn("getent passwd", pid, true);
3748
3749 x = strchr(line, ':');
3750 if (!x) {
3751 log_error("/etc/passwd entry has invalid user field.");
3752 return -EIO;
3753 }
3754
3755 u = strchr(x+1, ':');
3756 if (!u) {
3757 log_error("/etc/passwd entry has invalid password field.");
3758 return -EIO;
3759 }
3760
3761 u++;
3762 g = strchr(u, ':');
3763 if (!g) {
3764 log_error("/etc/passwd entry has invalid UID field.");
3765 return -EIO;
3766 }
3767
3768 *g = 0;
3769 g++;
3770 x = strchr(g, ':');
3771 if (!x) {
3772 log_error("/etc/passwd entry has invalid GID field.");
3773 return -EIO;
3774 }
3775
3776 *x = 0;
3777 h = strchr(x+1, ':');
3778 if (!h) {
3779 log_error("/etc/passwd entry has invalid GECOS field.");
3780 return -EIO;
3781 }
3782
3783 h++;
3784 x = strchr(h, ':');
3785 if (!x) {
3786 log_error("/etc/passwd entry has invalid home directory field.");
3787 return -EIO;
3788 }
3789
3790 *x = 0;
3791
3792 r = parse_uid(u, &uid);
3793 if (r < 0) {
3794 log_error("Failed to parse UID of user.");
3795 return -EIO;
3796 }
3797
3798 r = parse_gid(g, &gid);
3799 if (r < 0) {
3800 log_error("Failed to parse GID of user.");
3801 return -EIO;
3802 }
3803
3804 home = strdup(h);
3805 if (!home)
3806 return log_oom();
3807
3808 /* Second, get group memberships */
3809 fd = spawn_getent("initgroups", arg_user, &pid);
3810 if (fd < 0)
3811 return fd;
3812
3813 fclose(f);
3814 f = fdopen(fd, "r");
3815 if (!f)
3816 return log_oom();
3817 fd = -1;
3818
3819 if (!fgets(line, sizeof(line), f)) {
3820 if (!ferror(f)) {
3821 log_error("Failed to resolve user %s.", arg_user);
3822 return -ESRCH;
3823 }
3824
3825 log_error_errno(errno, "Failed to read from getent: %m");
3826 return -errno;
3827 }
3828
3829 truncate_nl(line);
3830
3831 wait_for_terminate_and_warn("getent initgroups", pid, true);
3832
3833 /* Skip over the username and subsequent separator whitespace */
3834 x = line;
3835 x += strcspn(x, WHITESPACE);
3836 x += strspn(x, WHITESPACE);
3837
3838 FOREACH_WORD(word, l, x, state) {
3839 char c[l+1];
3840
3841 memcpy(c, word, l);
3842 c[l] = 0;
3843
3844 if (!GREEDY_REALLOC(uids, sz, n_uids+1))
3845 return log_oom();
3846
3847 r = parse_uid(c, &uids[n_uids++]);
3848 if (r < 0) {
3849 log_error("Failed to parse group data from getent.");
3850 return -EIO;
3851 }
3852 }
3853
3854 r = mkdir_parents(home, 0775);
3855 if (r < 0)
3856 return log_error_errno(r, "Failed to make home root directory: %m");
3857
3858 r = mkdir_safe(home, 0755, uid, gid);
3859 if (r < 0 && r != -EEXIST)
3860 return log_error_errno(r, "Failed to make home directory: %m");
3861
3862 (void) fchown(STDIN_FILENO, uid, gid);
3863 (void) fchown(STDOUT_FILENO, uid, gid);
3864 (void) fchown(STDERR_FILENO, uid, gid);
3865
3866 if (setgroups(n_uids, uids) < 0)
3867 return log_error_errno(errno, "Failed to set auxiliary groups: %m");
3868
3869 if (setresgid(gid, gid, gid) < 0)
3870 return log_error_errno(errno, "setregid() failed: %m");
3871
3872 if (setresuid(uid, uid, uid) < 0)
3873 return log_error_errno(errno, "setreuid() failed: %m");
3874
3875 if (_home) {
3876 *_home = home;
3877 home = NULL;
3878 }
3879
3880 return 0;
3881 }
3882
3883 /*
3884 * Return values:
3885 * < 0 : wait_for_terminate() failed to get the state of the
3886 * container, the container was terminated by a signal, or
3887 * failed for an unknown reason. No change is made to the
3888 * container argument.
3889 * > 0 : The program executed in the container terminated with an
3890 * error. The exit code of the program executed in the
3891 * container is returned. The container argument has been set
3892 * to CONTAINER_TERMINATED.
3893 * 0 : The container is being rebooted, has been shut down or exited
3894 * successfully. The container argument has been set to either
3895 * CONTAINER_TERMINATED or CONTAINER_REBOOTED.
3896 *
3897 * That is, success is indicated by a return value of zero, and an
3898 * error is indicated by a non-zero value.
3899 */
3900 static int wait_for_container(pid_t pid, ContainerStatus *container) {
3901 siginfo_t status;
3902 int r;
3903
3904 r = wait_for_terminate(pid, &status);
3905 if (r < 0)
3906 return log_warning_errno(r, "Failed to wait for container: %m");
3907
3908 switch (status.si_code) {
3909
3910 case CLD_EXITED:
3911 if (status.si_status == 0) {
3912 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
3913
3914 } else
3915 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
3916
3917 *container = CONTAINER_TERMINATED;
3918 return status.si_status;
3919
3920 case CLD_KILLED:
3921 if (status.si_status == SIGINT) {
3922
3923 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
3924 *container = CONTAINER_TERMINATED;
3925 return 0;
3926
3927 } else if (status.si_status == SIGHUP) {
3928
3929 log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
3930 *container = CONTAINER_REBOOTED;
3931 return 0;
3932 }
3933
3934 /* CLD_KILLED fallthrough */
3935
3936 case CLD_DUMPED:
3937 log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
3938 return -EIO;
3939
3940 default:
3941 log_error("Container %s failed due to unknown reason.", arg_machine);
3942 return -EIO;
3943 }
3944
3945 return r;
3946 }
3947
3948 static void nop_handler(int sig) {}
3949
3950 static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
3951 pid_t pid;
3952
3953 pid = PTR_TO_UINT32(userdata);
3954 if (pid > 0) {
3955 if (kill(pid, arg_kill_signal) >= 0) {
3956 log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
3957 sd_event_source_set_userdata(s, NULL);
3958 return 0;
3959 }
3960 }
3961
3962 sd_event_exit(sd_event_source_get_event(s), 0);
3963 return 0;
3964 }
3965
3966 static int determine_names(void) {
3967 int r;
3968
3969 if (!arg_image && !arg_directory) {
3970 if (arg_machine) {
3971 _cleanup_(image_unrefp) Image *i = NULL;
3972
3973 r = image_find(arg_machine, &i);
3974 if (r < 0)
3975 return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
3976 else if (r == 0) {
3977 log_error("No image for machine '%s': %m", arg_machine);
3978 return -ENOENT;
3979 }
3980
3981 if (i->type == IMAGE_RAW)
3982 r = set_sanitized_path(&arg_image, i->path);
3983 else
3984 r = set_sanitized_path(&arg_directory, i->path);
3985 if (r < 0)
3986 return log_error_errno(r, "Invalid image directory: %m");
3987
3988 if (!arg_ephemeral)
3989 arg_read_only = arg_read_only || i->read_only;
3990 } else
3991 arg_directory = get_current_dir_name();
3992
3993 if (!arg_directory && !arg_machine) {
3994 log_error("Failed to determine path, please use -D or -i.");
3995 return -EINVAL;
3996 }
3997 }
3998
3999 if (!arg_machine) {
4000 if (arg_directory && path_equal(arg_directory, "/"))
4001 arg_machine = gethostname_malloc();
4002 else
4003 arg_machine = strdup(basename(arg_image ?: arg_directory));
4004
4005 if (!arg_machine)
4006 return log_oom();
4007
4008 hostname_cleanup(arg_machine, false);
4009 if (!machine_name_is_valid(arg_machine)) {
4010 log_error("Failed to determine machine name automatically, please use -M.");
4011 return -EINVAL;
4012 }
4013
4014 if (arg_ephemeral) {
4015 char *b;
4016
4017 /* Add a random suffix when this is an
4018 * ephemeral machine, so that we can run many
4019 * instances at once without manually having
4020 * to specify -M each time. */
4021
4022 if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
4023 return log_oom();
4024
4025 free(arg_machine);
4026 arg_machine = b;
4027 }
4028 }
4029
4030 return 0;
4031 }
4032
4033 static int determine_uid_shift(const char *directory) {
4034 int r;
4035
4036 if (!arg_userns) {
4037 arg_uid_shift = 0;
4038 return 0;
4039 }
4040
4041 if (arg_uid_shift == UID_INVALID) {
4042 struct stat st;
4043
4044 r = stat(directory, &st);
4045 if (r < 0)
4046 return log_error_errno(errno, "Failed to determine UID base of %s: %m", directory);
4047
4048 arg_uid_shift = st.st_uid & UINT32_C(0xffff0000);
4049
4050 if (arg_uid_shift != (st.st_gid & UINT32_C(0xffff0000))) {
4051 log_error("UID and GID base of %s don't match.", directory);
4052 return -EINVAL;
4053 }
4054
4055 arg_uid_range = UINT32_C(0x10000);
4056 }
4057
4058 if (arg_uid_shift > (uid_t) -1 - arg_uid_range) {
4059 log_error("UID base too high for UID range.");
4060 return -EINVAL;
4061 }
4062
4063 log_info("Using user namespaces with base " UID_FMT " and range " UID_FMT ".", arg_uid_shift, arg_uid_range);
4064 return 0;
4065 }
4066
4067 static int inner_child(
4068 Barrier *barrier,
4069 const char *directory,
4070 bool secondary,
4071 int kmsg_socket,
4072 int rtnl_socket,
4073 FDSet *fds,
4074 int argc,
4075 char *argv[]) {
4076
4077 _cleanup_free_ char *home = NULL;
4078 unsigned n_env = 2;
4079 const char *envp[] = {
4080 "PATH=" DEFAULT_PATH_SPLIT_USR,
4081 "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
4082 NULL, /* TERM */
4083 NULL, /* HOME */
4084 NULL, /* USER */
4085 NULL, /* LOGNAME */
4086 NULL, /* container_uuid */
4087 NULL, /* LISTEN_FDS */
4088 NULL, /* LISTEN_PID */
4089 NULL
4090 };
4091
4092 _cleanup_strv_free_ char **env_use = NULL;
4093 int r;
4094
4095 assert(barrier);
4096 assert(directory);
4097 assert(kmsg_socket >= 0);
4098
4099 if (arg_userns) {
4100 /* Tell the parent, that it now can write the UID map. */
4101 (void) barrier_place(barrier); /* #1 */
4102
4103 /* Wait until the parent wrote the UID map */
4104 if (!barrier_place_and_sync(barrier)) { /* #2 */
4105 log_error("Parent died too early");
4106 return -ESRCH;
4107 }
4108 }
4109
4110 r = mount_all(NULL, true);
4111 if (r < 0)
4112 return r;
4113
4114 /* Wait until we are cgroup-ified, so that we
4115 * can mount the right cgroup path writable */
4116 if (!barrier_place_and_sync(barrier)) { /* #3 */
4117 log_error("Parent died too early");
4118 return -ESRCH;
4119 }
4120
4121 r = mount_systemd_cgroup_writable("");
4122 if (r < 0)
4123 return r;
4124
4125 r = reset_uid_gid();
4126 if (r < 0)
4127 return log_error_errno(r, "Couldn't become new root: %m");
4128
4129 r = setup_boot_id(NULL);
4130 if (r < 0)
4131 return r;
4132
4133 r = setup_kmsg(NULL, kmsg_socket);
4134 if (r < 0)
4135 return r;
4136 kmsg_socket = safe_close(kmsg_socket);
4137
4138 umask(0022);
4139
4140 if (setsid() < 0)
4141 return log_error_errno(errno, "setsid() failed: %m");
4142
4143 if (arg_private_network)
4144 loopback_setup();
4145
4146 r = send_rtnl(rtnl_socket);
4147 if (r < 0)
4148 return r;
4149 rtnl_socket = safe_close(rtnl_socket);
4150
4151 if (drop_capabilities() < 0)
4152 return log_error_errno(errno, "drop_capabilities() failed: %m");
4153
4154 setup_hostname();
4155
4156 if (arg_personality != PERSONALITY_INVALID) {
4157 if (personality(arg_personality) < 0)
4158 return log_error_errno(errno, "personality() failed: %m");
4159 } else if (secondary) {
4160 if (personality(PER_LINUX32) < 0)
4161 return log_error_errno(errno, "personality() failed: %m");
4162 }
4163
4164 #ifdef HAVE_SELINUX
4165 if (arg_selinux_context)
4166 if (setexeccon((security_context_t) arg_selinux_context) < 0)
4167 return log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
4168 #endif
4169
4170 r = change_uid_gid(&home);
4171 if (r < 0)
4172 return r;
4173
4174 envp[n_env] = strv_find_prefix(environ, "TERM=");
4175 if (envp[n_env])
4176 n_env ++;
4177
4178 if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
4179 (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
4180 (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0))
4181 return log_oom();
4182
4183 if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
4184 char as_uuid[37];
4185
4186 if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_format_as_uuid(arg_uuid, as_uuid)) < 0)
4187 return log_oom();
4188 }
4189
4190 if (fdset_size(fds) > 0) {
4191 r = fdset_cloexec(fds, false);
4192 if (r < 0)
4193 return log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
4194
4195 if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", fdset_size(fds)) < 0) ||
4196 (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0))
4197 return log_oom();
4198 }
4199
4200 env_use = strv_env_merge(2, envp, arg_setenv);
4201 if (!env_use)
4202 return log_oom();
4203
4204 /* Let the parent know that we are ready and
4205 * wait until the parent is ready with the
4206 * setup, too... */
4207 if (!barrier_place_and_sync(barrier)) { /* #4 */
4208 log_error("Parent died too early");
4209 return -ESRCH;
4210 }
4211
4212 /* Now, explicitly close the log, so that we
4213 * then can close all remaining fds. Closing
4214 * the log explicitly first has the benefit
4215 * that the logging subsystem knows about it,
4216 * and is thus ready to be reopened should we
4217 * need it again. Note that the other fds
4218 * closed here are at least the locking and
4219 * barrier fds. */
4220 log_close();
4221 (void) fdset_close_others(fds);
4222
4223 if (arg_boot) {
4224 char **a;
4225 size_t m;
4226
4227 /* Automatically search for the init system */
4228
4229 m = 1 + argc - optind;
4230 a = newa(char*, m + 1);
4231 memcpy(a + 1, argv + optind, m * sizeof(char*));
4232
4233 a[0] = (char*) "/usr/lib/systemd/systemd";
4234 execve(a[0], a, env_use);
4235
4236 a[0] = (char*) "/lib/systemd/systemd";
4237 execve(a[0], a, env_use);
4238
4239 a[0] = (char*) "/sbin/init";
4240 execve(a[0], a, env_use);
4241 } else if (argc > optind)
4242 execvpe(argv[optind], argv + optind, env_use);
4243 else {
4244 chdir(home ? home : "/root");
4245 execle("/bin/bash", "-bash", NULL, env_use);
4246 execle("/bin/sh", "-sh", NULL, env_use);
4247 }
4248
4249 (void) log_open();
4250 return log_error_errno(errno, "execv() failed: %m");
4251 }
4252
4253 static int outer_child(
4254 Barrier *barrier,
4255 const char *directory,
4256 const char *console,
4257 const char *root_device, bool root_device_rw,
4258 const char *home_device, bool home_device_rw,
4259 const char *srv_device, bool srv_device_rw,
4260 bool interactive,
4261 bool secondary,
4262 int pid_socket,
4263 int kmsg_socket,
4264 int rtnl_socket,
4265 int uid_shift_socket,
4266 FDSet *fds,
4267 int argc,
4268 char *argv[]) {
4269
4270 pid_t pid;
4271 ssize_t l;
4272 int r;
4273
4274 assert(barrier);
4275 assert(directory);
4276 assert(console);
4277 assert(pid_socket >= 0);
4278 assert(kmsg_socket >= 0);
4279
4280 if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
4281 return log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
4282
4283 if (interactive) {
4284 close_nointr(STDIN_FILENO);
4285 close_nointr(STDOUT_FILENO);
4286 close_nointr(STDERR_FILENO);
4287
4288 r = open_terminal(console, O_RDWR);
4289 if (r != STDIN_FILENO) {
4290 if (r >= 0) {
4291 safe_close(r);
4292 r = -EINVAL;
4293 }
4294
4295 return log_error_errno(r, "Failed to open console: %m");
4296 }
4297
4298 if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
4299 dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
4300 return log_error_errno(errno, "Failed to duplicate console: %m");
4301 }
4302
4303 r = reset_audit_loginuid();
4304 if (r < 0)
4305 return r;
4306
4307 /* Mark everything as slave, so that we still
4308 * receive mounts from the real root, but don't
4309 * propagate mounts to the real root. */
4310 if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
4311 return log_error_errno(errno, "MS_SLAVE|MS_REC failed: %m");
4312
4313 r = mount_devices(directory,
4314 root_device, root_device_rw,
4315 home_device, home_device_rw,
4316 srv_device, srv_device_rw);
4317 if (r < 0)
4318 return r;
4319
4320 r = determine_uid_shift(directory);
4321 if (r < 0)
4322 return r;
4323
4324 if (arg_userns) {
4325 l = send(uid_shift_socket, &arg_uid_shift, sizeof(arg_uid_shift), MSG_NOSIGNAL);
4326 if (l < 0)
4327 return log_error_errno(errno, "Failed to send UID shift: %m");
4328 if (l != sizeof(arg_uid_shift)) {
4329 log_error("Short write while sending UID shift.");
4330 return -EIO;
4331 }
4332 }
4333
4334 /* Turn directory into bind mount */
4335 if (mount(directory, directory, NULL, MS_BIND|MS_REC, NULL) < 0)
4336 return log_error_errno(errno, "Failed to make bind mount: %m");
4337
4338 r = setup_volatile(directory);
4339 if (r < 0)
4340 return r;
4341
4342 r = setup_volatile_state(directory);
4343 if (r < 0)
4344 return r;
4345
4346 r = base_filesystem_create(directory, arg_uid_shift, (gid_t) arg_uid_shift);
4347 if (r < 0)
4348 return r;
4349
4350 if (arg_read_only) {
4351 r = bind_remount_recursive(directory, true);
4352 if (r < 0)
4353 return log_error_errno(r, "Failed to make tree read-only: %m");
4354 }
4355
4356 r = mount_all(directory, false);
4357 if (r < 0)
4358 return r;
4359
4360 if (copy_devnodes(directory) < 0)
4361 return r;
4362
4363 dev_setup(directory, arg_uid_shift, arg_uid_shift);
4364
4365 if (setup_pts(directory) < 0)
4366 return r;
4367
4368 r = setup_propagate(directory);
4369 if (r < 0)
4370 return r;
4371
4372 r = setup_dev_console(directory, console);
4373 if (r < 0)
4374 return r;
4375
4376 r = setup_seccomp();
4377 if (r < 0)
4378 return r;
4379
4380 r = setup_timezone(directory);
4381 if (r < 0)
4382 return r;
4383
4384 r = setup_resolv_conf(directory);
4385 if (r < 0)
4386 return r;
4387
4388 r = setup_journal(directory);
4389 if (r < 0)
4390 return r;
4391
4392 r = mount_custom(directory);
4393 if (r < 0)
4394 return r;
4395
4396 r = mount_cgroup(directory);
4397 if (r < 0)
4398 return r;
4399
4400 r = mount_move_root(directory);
4401 if (r < 0)
4402 return log_error_errno(r, "Failed to move root directory: %m");
4403
4404 pid = raw_clone(SIGCHLD|CLONE_NEWNS|
4405 (arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS) |
4406 (arg_private_network ? CLONE_NEWNET : 0) |
4407 (arg_userns ? CLONE_NEWUSER : 0),
4408 NULL);
4409 if (pid < 0)
4410 return log_error_errno(errno, "Failed to fork inner child: %m");
4411
4412 if (pid == 0) {
4413 pid_socket = safe_close(pid_socket);
4414 uid_shift_socket = safe_close(uid_shift_socket);
4415
4416 /* The inner child has all namespaces that are
4417 * requested, so that we all are owned by the user if
4418 * user namespaces are turned on. */
4419
4420 r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, fds, argc, argv);
4421 if (r < 0)
4422 _exit(EXIT_FAILURE);
4423
4424 _exit(EXIT_SUCCESS);
4425 }
4426
4427 l = send(pid_socket, &pid, sizeof(pid), MSG_NOSIGNAL);
4428 if (l < 0)
4429 return log_error_errno(errno, "Failed to send PID: %m");
4430 if (l != sizeof(pid)) {
4431 log_error("Short write while sending PID.");
4432 return -EIO;
4433 }
4434
4435 pid_socket = safe_close(pid_socket);
4436
4437 return 0;
4438 }
4439
4440 static int setup_uid_map(pid_t pid) {
4441 char uid_map[strlen("/proc//uid_map") + DECIMAL_STR_MAX(uid_t) + 1], line[DECIMAL_STR_MAX(uid_t)*3+3+1];
4442 int r;
4443
4444 assert(pid > 1);
4445
4446 xsprintf(uid_map, "/proc/" PID_FMT "/uid_map", pid);
4447 xsprintf(line, UID_FMT " " UID_FMT " " UID_FMT "\n", 0, arg_uid_shift, arg_uid_range);
4448 r = write_string_file(uid_map, line, 0);
4449 if (r < 0)
4450 return log_error_errno(r, "Failed to write UID map: %m");
4451
4452 /* We always assign the same UID and GID ranges */
4453 xsprintf(uid_map, "/proc/" PID_FMT "/gid_map", pid);
4454 r = write_string_file(uid_map, line, 0);
4455 if (r < 0)
4456 return log_error_errno(r, "Failed to write GID map: %m");
4457
4458 return 0;
4459 }
4460
4461 static int chown_cgroup(pid_t pid) {
4462 _cleanup_free_ char *path = NULL, *fs = NULL;
4463 _cleanup_close_ int fd = -1;
4464 const char *fn;
4465 int r;
4466
4467 r = cg_pid_get_path(NULL, pid, &path);
4468 if (r < 0)
4469 return log_error_errno(r, "Failed to get container cgroup path: %m");
4470
4471 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, path, NULL, &fs);
4472 if (r < 0)
4473 return log_error_errno(r, "Failed to get file system path for container cgroup: %m");
4474
4475 fd = open(fs, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
4476 if (fd < 0)
4477 return log_error_errno(errno, "Failed to open %s: %m", fs);
4478
4479 FOREACH_STRING(fn, ".", "tasks", "notify_on_release", "cgroup.procs", "cgroup.clone_children")
4480 if (fchownat(fd, fn, arg_uid_shift, arg_uid_shift, 0) < 0)
4481 log_warning_errno(errno, "Failed to chown() cgroup file %s, ignoring: %m", fn);
4482
4483 return 0;
4484 }
4485
4486 int main(int argc, char *argv[]) {
4487
4488 _cleanup_free_ char *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL, *console = NULL;
4489 bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
4490 _cleanup_close_ int master = -1, image_fd = -1;
4491 _cleanup_fdset_free_ FDSet *fds = NULL;
4492 int r, n_fd_passed, loop_nr = -1;
4493 char veth_name[IFNAMSIZ];
4494 bool secondary = false, remove_subvol = false;
4495 sigset_t mask_chld;
4496 pid_t pid = 0;
4497 int ret = EXIT_SUCCESS;
4498 union in_addr_union exposed = {};
4499 _cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
4500 bool interactive;
4501
4502 log_parse_environment();
4503 log_open();
4504
4505 r = parse_argv(argc, argv);
4506 if (r <= 0)
4507 goto finish;
4508
4509 r = determine_names();
4510 if (r < 0)
4511 goto finish;
4512
4513 if (geteuid() != 0) {
4514 log_error("Need to be root.");
4515 r = -EPERM;
4516 goto finish;
4517 }
4518
4519 n_fd_passed = sd_listen_fds(false);
4520 if (n_fd_passed > 0) {
4521 r = fdset_new_listen_fds(&fds, false);
4522 if (r < 0) {
4523 log_error_errno(r, "Failed to collect file descriptors: %m");
4524 goto finish;
4525 }
4526 }
4527
4528 if (arg_directory) {
4529 assert(!arg_image);
4530
4531 if (path_equal(arg_directory, "/") && !arg_ephemeral) {
4532 log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
4533 r = -EINVAL;
4534 goto finish;
4535 }
4536
4537 if (arg_ephemeral) {
4538 _cleanup_free_ char *np = NULL;
4539
4540 /* If the specified path is a mount point we
4541 * generate the new snapshot immediately
4542 * inside it under a random name. However if
4543 * the specified is not a mount point we
4544 * create the new snapshot in the parent
4545 * directory, just next to it. */
4546 r = path_is_mount_point(arg_directory, 0);
4547 if (r < 0) {
4548 log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
4549 goto finish;
4550 }
4551 if (r > 0)
4552 r = tempfn_random_child(arg_directory, "machine.", &np);
4553 else
4554 r = tempfn_random(arg_directory, "machine.", &np);
4555 if (r < 0) {
4556 log_error_errno(r, "Failed to generate name for snapshot: %m");
4557 goto finish;
4558 }
4559
4560 r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4561 if (r < 0) {
4562 log_error_errno(r, "Failed to lock %s: %m", np);
4563 goto finish;
4564 }
4565
4566 r = btrfs_subvol_snapshot(arg_directory, np, (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE);
4567 if (r < 0) {
4568 log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
4569 goto finish;
4570 }
4571
4572 free(arg_directory);
4573 arg_directory = np;
4574 np = NULL;
4575
4576 remove_subvol = true;
4577
4578 } else {
4579 r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4580 if (r == -EBUSY) {
4581 log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
4582 goto finish;
4583 }
4584 if (r < 0) {
4585 log_error_errno(r, "Failed to lock %s: %m", arg_directory);
4586 return r;
4587 }
4588
4589 if (arg_template) {
4590 r = btrfs_subvol_snapshot(arg_template, arg_directory, (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE);
4591 if (r == -EEXIST) {
4592 if (!arg_quiet)
4593 log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
4594 } else if (r < 0) {
4595 log_error_errno(r, "Couldn't create snapshot %s from %s: %m", arg_directory, arg_template);
4596 goto finish;
4597 } else {
4598 if (!arg_quiet)
4599 log_info("Populated %s from template %s.", arg_directory, arg_template);
4600 }
4601 }
4602 }
4603
4604 if (arg_boot) {
4605 if (path_is_os_tree(arg_directory) <= 0) {
4606 log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
4607 r = -EINVAL;
4608 goto finish;
4609 }
4610 } else {
4611 const char *p;
4612
4613 p = strjoina(arg_directory,
4614 argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
4615 if (access(p, F_OK) < 0) {
4616 log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
4617 r = -EINVAL;
4618 goto finish;
4619 }
4620 }
4621
4622 } else {
4623 char template[] = "/tmp/nspawn-root-XXXXXX";
4624
4625 assert(arg_image);
4626 assert(!arg_template);
4627
4628 r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
4629 if (r == -EBUSY) {
4630 r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
4631 goto finish;
4632 }
4633 if (r < 0) {
4634 r = log_error_errno(r, "Failed to create image lock: %m");
4635 goto finish;
4636 }
4637
4638 if (!mkdtemp(template)) {
4639 log_error_errno(errno, "Failed to create temporary directory: %m");
4640 r = -errno;
4641 goto finish;
4642 }
4643
4644 arg_directory = strdup(template);
4645 if (!arg_directory) {
4646 r = log_oom();
4647 goto finish;
4648 }
4649
4650 image_fd = setup_image(&device_path, &loop_nr);
4651 if (image_fd < 0) {
4652 r = image_fd;
4653 goto finish;
4654 }
4655
4656 r = dissect_image(image_fd,
4657 &root_device, &root_device_rw,
4658 &home_device, &home_device_rw,
4659 &srv_device, &srv_device_rw,
4660 &secondary);
4661 if (r < 0)
4662 goto finish;
4663 }
4664
4665 r = custom_mounts_prepare();
4666 if (r < 0)
4667 goto finish;
4668
4669 interactive =
4670 isatty(STDIN_FILENO) > 0 &&
4671 isatty(STDOUT_FILENO) > 0;
4672
4673 master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
4674 if (master < 0) {
4675 r = log_error_errno(errno, "Failed to acquire pseudo tty: %m");
4676 goto finish;
4677 }
4678
4679 r = ptsname_malloc(master, &console);
4680 if (r < 0) {
4681 r = log_error_errno(r, "Failed to determine tty name: %m");
4682 goto finish;
4683 }
4684
4685 if (unlockpt(master) < 0) {
4686 r = log_error_errno(errno, "Failed to unlock tty: %m");
4687 goto finish;
4688 }
4689
4690 if (!arg_quiet)
4691 log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
4692 arg_machine, arg_image ?: arg_directory);
4693
4694 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
4695
4696 assert_se(sigemptyset(&mask_chld) == 0);
4697 assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
4698
4699 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) {
4700 r = log_error_errno(errno, "Failed to become subreaper: %m");
4701 goto finish;
4702 }
4703
4704 for (;;) {
4705 _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 }, rtnl_socket_pair[2] = { -1, -1 }, pid_socket_pair[2] = { -1, -1 },
4706 uid_shift_socket_pair[2] = { -1, -1 };
4707 ContainerStatus container_status;
4708 _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
4709 static const struct sigaction sa = {
4710 .sa_handler = nop_handler,
4711 .sa_flags = SA_NOCLDSTOP,
4712 };
4713 int ifi = 0;
4714 ssize_t l;
4715 _cleanup_event_unref_ sd_event *event = NULL;
4716 _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
4717 _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
4718 char last_char = 0;
4719
4720 r = barrier_create(&barrier);
4721 if (r < 0) {
4722 log_error_errno(r, "Cannot initialize IPC barrier: %m");
4723 goto finish;
4724 }
4725
4726 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
4727 r = log_error_errno(errno, "Failed to create kmsg socket pair: %m");
4728 goto finish;
4729 }
4730
4731 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) {
4732 r = log_error_errno(errno, "Failed to create rtnl socket pair: %m");
4733 goto finish;
4734 }
4735
4736 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, pid_socket_pair) < 0) {
4737 r = log_error_errno(errno, "Failed to create pid socket pair: %m");
4738 goto finish;
4739 }
4740
4741 if (arg_userns)
4742 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, uid_shift_socket_pair) < 0) {
4743 r = log_error_errno(errno, "Failed to create uid shift socket pair: %m");
4744 goto finish;
4745 }
4746
4747 /* Child can be killed before execv(), so handle SIGCHLD
4748 * in order to interrupt parent's blocking calls and
4749 * give it a chance to call wait() and terminate. */
4750 r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
4751 if (r < 0) {
4752 r = log_error_errno(errno, "Failed to change the signal mask: %m");
4753 goto finish;
4754 }
4755
4756 r = sigaction(SIGCHLD, &sa, NULL);
4757 if (r < 0) {
4758 r = log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
4759 goto finish;
4760 }
4761
4762 pid = raw_clone(SIGCHLD|CLONE_NEWNS, NULL);
4763 if (pid < 0) {
4764 if (errno == EINVAL)
4765 r = log_error_errno(errno, "clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
4766 else
4767 r = log_error_errno(errno, "clone() failed: %m");
4768
4769 goto finish;
4770 }
4771
4772 if (pid == 0) {
4773 /* The outer child only has a file system namespace. */
4774 barrier_set_role(&barrier, BARRIER_CHILD);
4775
4776 master = safe_close(master);
4777
4778 kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
4779 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4780 pid_socket_pair[0] = safe_close(pid_socket_pair[0]);
4781 uid_shift_socket_pair[0] = safe_close(uid_shift_socket_pair[0]);
4782
4783 (void) reset_all_signal_handlers();
4784 (void) reset_signal_mask();
4785
4786 r = outer_child(&barrier,
4787 arg_directory,
4788 console,
4789 root_device, root_device_rw,
4790 home_device, home_device_rw,
4791 srv_device, srv_device_rw,
4792 interactive,
4793 secondary,
4794 pid_socket_pair[1],
4795 kmsg_socket_pair[1],
4796 rtnl_socket_pair[1],
4797 uid_shift_socket_pair[1],
4798 fds,
4799 argc, argv);
4800 if (r < 0)
4801 _exit(EXIT_FAILURE);
4802
4803 _exit(EXIT_SUCCESS);
4804 }
4805
4806 barrier_set_role(&barrier, BARRIER_PARENT);
4807
4808 fdset_free(fds);
4809 fds = NULL;
4810
4811 kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
4812 rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
4813 pid_socket_pair[1] = safe_close(pid_socket_pair[1]);
4814
4815 /* Wait for the outer child. */
4816 r = wait_for_terminate_and_warn("namespace helper", pid, NULL);
4817 if (r < 0)
4818 goto finish;
4819 if (r != 0) {
4820 r = -EIO;
4821 goto finish;
4822 }
4823 pid = 0;
4824
4825 /* And now retrieve the PID of the inner child. */
4826 l = recv(pid_socket_pair[0], &pid, sizeof(pid), 0);
4827 if (l < 0) {
4828 r = log_error_errno(errno, "Failed to read inner child PID: %m");
4829 goto finish;
4830 }
4831 if (l != sizeof(pid)) {
4832 log_error("Short read while reading inner child PID: %m");
4833 r = EIO;
4834 goto finish;
4835 }
4836
4837 log_debug("Init process invoked as PID " PID_FMT, pid);
4838
4839 if (arg_userns) {
4840 if (!barrier_place_and_sync(&barrier)) { /* #1 */
4841 log_error("Child died too early.");
4842 r = -ESRCH;
4843 goto finish;
4844 }
4845
4846 l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof(arg_uid_shift), 0);
4847 if (l < 0) {
4848 r = log_error_errno(errno, "Failed to read UID shift: %m");
4849 goto finish;
4850 }
4851 if (l != sizeof(arg_uid_shift)) {
4852 log_error("Short read while reading UID shift: %m");
4853 r = EIO;
4854 goto finish;
4855 }
4856
4857 r = setup_uid_map(pid);
4858 if (r < 0)
4859 goto finish;
4860
4861 (void) barrier_place(&barrier); /* #2 */
4862 }
4863
4864 r = move_network_interfaces(pid);
4865 if (r < 0)
4866 goto finish;
4867
4868 r = setup_veth(pid, veth_name, &ifi);
4869 if (r < 0)
4870 goto finish;
4871
4872 r = setup_bridge(veth_name, &ifi);
4873 if (r < 0)
4874 goto finish;
4875
4876 r = setup_macvlan(pid);
4877 if (r < 0)
4878 goto finish;
4879
4880 r = setup_ipvlan(pid);
4881 if (r < 0)
4882 goto finish;
4883
4884 r = register_machine(pid, ifi);
4885 if (r < 0)
4886 goto finish;
4887
4888 r = chown_cgroup(pid);
4889 if (r < 0)
4890 goto finish;
4891
4892 /* Notify the child that the parent is ready with all
4893 * its setup (including cgroup-ification), and that
4894 * the child can now hand over control to the code to
4895 * run inside the container. */
4896 (void) barrier_place(&barrier); /* #3 */
4897
4898 /* Block SIGCHLD here, before notifying child.
4899 * process_pty() will handle it with the other signals. */
4900 assert_se(sigprocmask(SIG_BLOCK, &mask_chld, NULL) >= 0);
4901
4902 /* Reset signal to default */
4903 r = default_signals(SIGCHLD, -1);
4904 if (r < 0) {
4905 log_error_errno(r, "Failed to reset SIGCHLD: %m");
4906 goto finish;
4907 }
4908
4909 /* Let the child know that we are ready and wait that the child is completely ready now. */
4910 if (!barrier_place_and_sync(&barrier)) { /* #5 */
4911 log_error("Client died too early.");
4912 r = -ESRCH;
4913 goto finish;
4914 }
4915
4916 sd_notifyf(false,
4917 "READY=1\n"
4918 "STATUS=Container running.\n"
4919 "X_NSPAWN_LEADER_PID=" PID_FMT, pid);
4920
4921 r = sd_event_new(&event);
4922 if (r < 0) {
4923 log_error_errno(r, "Failed to get default event source: %m");
4924 goto finish;
4925 }
4926
4927 if (arg_kill_signal > 0) {
4928 /* Try to kill the init system on SIGINT or SIGTERM */
4929 sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, UINT32_TO_PTR(pid));
4930 sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, UINT32_TO_PTR(pid));
4931 } else {
4932 /* Immediately exit */
4933 sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
4934 sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
4935 }
4936
4937 /* simply exit on sigchld */
4938 sd_event_add_signal(event, NULL, SIGCHLD, NULL, NULL);
4939
4940 if (arg_expose_ports) {
4941 r = watch_rtnl(event, rtnl_socket_pair[0], &exposed, &rtnl);
4942 if (r < 0)
4943 goto finish;
4944
4945 (void) expose_ports(rtnl, &exposed);
4946 }
4947
4948 rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
4949
4950 r = pty_forward_new(event, master, true, !interactive, &forward);
4951 if (r < 0) {
4952 log_error_errno(r, "Failed to create PTY forwarder: %m");
4953 goto finish;
4954 }
4955
4956 r = sd_event_loop(event);
4957 if (r < 0) {
4958 log_error_errno(r, "Failed to run event loop: %m");
4959 goto finish;
4960 }
4961
4962 pty_forward_get_last_char(forward, &last_char);
4963
4964 forward = pty_forward_free(forward);
4965
4966 if (!arg_quiet && last_char != '\n')
4967 putc('\n', stdout);
4968
4969 /* Kill if it is not dead yet anyway */
4970 terminate_machine(pid);
4971
4972 /* Normally redundant, but better safe than sorry */
4973 kill(pid, SIGKILL);
4974
4975 r = wait_for_container(pid, &container_status);
4976 pid = 0;
4977
4978 if (r < 0)
4979 /* We failed to wait for the container, or the
4980 * container exited abnormally */
4981 goto finish;
4982 else if (r > 0 || container_status == CONTAINER_TERMINATED){
4983 /* The container exited with a non-zero
4984 * status, or with zero status and no reboot
4985 * was requested. */
4986 ret = r;
4987 break;
4988 }
4989
4990 /* CONTAINER_REBOOTED, loop again */
4991
4992 if (arg_keep_unit) {
4993 /* Special handling if we are running as a
4994 * service: instead of simply restarting the
4995 * machine we want to restart the entire
4996 * service, so let's inform systemd about this
4997 * with the special exit code 133. The service
4998 * file uses RestartForceExitStatus=133 so
4999 * that this results in a full nspawn
5000 * restart. This is necessary since we might
5001 * have cgroup parameters set we want to have
5002 * flushed out. */
5003 ret = 133;
5004 r = 0;
5005 break;
5006 }
5007
5008 flush_ports(&exposed);
5009 }
5010
5011 finish:
5012 sd_notify(false,
5013 "STOPPING=1\n"
5014 "STATUS=Terminating...");
5015
5016 if (pid > 0)
5017 kill(pid, SIGKILL);
5018
5019 /* Try to flush whatever is still queued in the pty */
5020 if (master >= 0)
5021 (void) copy_bytes(master, STDOUT_FILENO, (off_t) -1, false);
5022
5023 loop_remove(loop_nr, &image_fd);
5024
5025 if (remove_subvol && arg_directory) {
5026 int k;
5027
5028 k = btrfs_subvol_remove(arg_directory, true);
5029 if (k < 0)
5030 log_warning_errno(k, "Cannot remove subvolume '%s', ignoring: %m", arg_directory);
5031 }
5032
5033 if (arg_machine) {
5034 const char *p;
5035
5036 p = strjoina("/run/systemd/nspawn/propagate/", arg_machine);
5037 (void) rm_rf(p, REMOVE_ROOT);
5038 }
5039
5040 free(arg_directory);
5041 free(arg_template);
5042 free(arg_image);
5043 free(arg_machine);
5044 free(arg_user);
5045 strv_free(arg_setenv);
5046 strv_free(arg_network_interfaces);
5047 strv_free(arg_network_macvlan);
5048 strv_free(arg_network_ipvlan);
5049 custom_mount_free_all();
5050
5051 flush_ports(&exposed);
5052
5053 while (arg_expose_ports) {
5054 ExposePort *p = arg_expose_ports;
5055 LIST_REMOVE(ports, arg_expose_ports, p);
5056 free(p);
5057 }
5058
5059 return r < 0 ? EXIT_FAILURE : ret;
5060 }
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