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663996b3 MS |
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/syscall.h> | |
27 | #include <sys/mount.h> | |
28 | #include <sys/wait.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <stdio.h> | |
32 | #include <errno.h> | |
33 | #include <sys/prctl.h> | |
34 | #include <sys/capability.h> | |
35 | #include <getopt.h> | |
663996b3 MS |
36 | #include <termios.h> |
37 | #include <sys/signalfd.h> | |
38 | #include <grp.h> | |
39 | #include <linux/fs.h> | |
40 | #include <sys/un.h> | |
41 | #include <sys/socket.h> | |
14228c0d | 42 | #include <linux/netlink.h> |
60f067b4 JS |
43 | #include <net/if.h> |
44 | #include <linux/veth.h> | |
45 | #include <sys/personality.h> | |
46 | #include <linux/loop.h> | |
663996b3 | 47 | |
60f067b4 JS |
48 | #ifdef HAVE_SELINUX |
49 | #include <selinux/selinux.h> | |
50 | #endif | |
51 | ||
52 | #ifdef HAVE_SECCOMP | |
53 | #include <seccomp.h> | |
54 | #endif | |
663996b3 | 55 | |
60f067b4 JS |
56 | #ifdef HAVE_BLKID |
57 | #include <blkid/blkid.h> | |
58 | #endif | |
59 | ||
60 | #include "sd-daemon.h" | |
61 | #include "sd-bus.h" | |
62 | #include "sd-id128.h" | |
63 | #include "sd-rtnl.h" | |
663996b3 MS |
64 | #include "log.h" |
65 | #include "util.h" | |
66 | #include "mkdir.h" | |
67 | #include "macro.h" | |
68 | #include "audit.h" | |
69 | #include "missing.h" | |
70 | #include "cgroup-util.h" | |
71 | #include "strv.h" | |
72 | #include "path-util.h" | |
73 | #include "loopback-setup.h" | |
663996b3 MS |
74 | #include "dev-setup.h" |
75 | #include "fdset.h" | |
76 | #include "build.h" | |
77 | #include "fileio.h" | |
60f067b4 JS |
78 | #include "bus-util.h" |
79 | #include "bus-error.h" | |
80 | #include "ptyfwd.h" | |
81 | #include "bus-kernel.h" | |
82 | #include "env-util.h" | |
83 | #include "def.h" | |
84 | #include "rtnl-util.h" | |
85 | #include "udev-util.h" | |
60f067b4 JS |
86 | #include "blkid-util.h" |
87 | #include "gpt.h" | |
88 | #include "siphash24.h" | |
89 | #include "copy.h" | |
e842803a | 90 | #include "base-filesystem.h" |
5eef597e | 91 | #include "barrier.h" |
60f067b4 JS |
92 | |
93 | #ifdef HAVE_SECCOMP | |
94 | #include "seccomp-util.h" | |
663996b3 MS |
95 | #endif |
96 | ||
60f067b4 JS |
97 | typedef enum ContainerStatus { |
98 | CONTAINER_TERMINATED, | |
99 | CONTAINER_REBOOTED | |
100 | } ContainerStatus; | |
101 | ||
663996b3 MS |
102 | typedef enum LinkJournal { |
103 | LINK_NO, | |
104 | LINK_AUTO, | |
105 | LINK_HOST, | |
106 | LINK_GUEST | |
107 | } LinkJournal; | |
108 | ||
5eef597e MP |
109 | typedef enum Volatile { |
110 | VOLATILE_NO, | |
111 | VOLATILE_YES, | |
112 | VOLATILE_STATE, | |
113 | } Volatile; | |
114 | ||
663996b3 MS |
115 | static char *arg_directory = NULL; |
116 | static char *arg_user = NULL; | |
14228c0d | 117 | static sd_id128_t arg_uuid = {}; |
663996b3 | 118 | static char *arg_machine = NULL; |
60f067b4 JS |
119 | static const char *arg_selinux_context = NULL; |
120 | static const char *arg_selinux_apifs_context = NULL; | |
14228c0d | 121 | static const char *arg_slice = NULL; |
663996b3 MS |
122 | static bool arg_private_network = false; |
123 | static bool arg_read_only = false; | |
124 | static bool arg_boot = false; | |
125 | static LinkJournal arg_link_journal = LINK_AUTO; | |
126 | static uint64_t arg_retain = | |
127 | (1ULL << CAP_CHOWN) | | |
128 | (1ULL << CAP_DAC_OVERRIDE) | | |
129 | (1ULL << CAP_DAC_READ_SEARCH) | | |
130 | (1ULL << CAP_FOWNER) | | |
131 | (1ULL << CAP_FSETID) | | |
132 | (1ULL << CAP_IPC_OWNER) | | |
133 | (1ULL << CAP_KILL) | | |
134 | (1ULL << CAP_LEASE) | | |
135 | (1ULL << CAP_LINUX_IMMUTABLE) | | |
136 | (1ULL << CAP_NET_BIND_SERVICE) | | |
137 | (1ULL << CAP_NET_BROADCAST) | | |
138 | (1ULL << CAP_NET_RAW) | | |
139 | (1ULL << CAP_SETGID) | | |
140 | (1ULL << CAP_SETFCAP) | | |
141 | (1ULL << CAP_SETPCAP) | | |
142 | (1ULL << CAP_SETUID) | | |
143 | (1ULL << CAP_SYS_ADMIN) | | |
144 | (1ULL << CAP_SYS_CHROOT) | | |
145 | (1ULL << CAP_SYS_NICE) | | |
146 | (1ULL << CAP_SYS_PTRACE) | | |
147 | (1ULL << CAP_SYS_TTY_CONFIG) | | |
148 | (1ULL << CAP_SYS_RESOURCE) | | |
149 | (1ULL << CAP_SYS_BOOT) | | |
150 | (1ULL << CAP_AUDIT_WRITE) | | |
60f067b4 JS |
151 | (1ULL << CAP_AUDIT_CONTROL) | |
152 | (1ULL << CAP_MKNOD); | |
663996b3 MS |
153 | static char **arg_bind = NULL; |
154 | static char **arg_bind_ro = NULL; | |
60f067b4 JS |
155 | static char **arg_tmpfs = NULL; |
156 | static char **arg_setenv = NULL; | |
157 | static bool arg_quiet = false; | |
158 | static bool arg_share_system = false; | |
159 | static bool arg_register = true; | |
160 | static bool arg_keep_unit = false; | |
161 | static char **arg_network_interfaces = NULL; | |
162 | static char **arg_network_macvlan = NULL; | |
163 | static bool arg_network_veth = false; | |
164 | static const char *arg_network_bridge = NULL; | |
165 | static unsigned long arg_personality = 0xffffffffLU; | |
166 | static const char *arg_image = NULL; | |
5eef597e | 167 | static Volatile arg_volatile = VOLATILE_NO; |
663996b3 | 168 | |
5eef597e | 169 | static void help(void) { |
663996b3 MS |
170 | printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n" |
171 | "Spawn a minimal namespace container for debugging, testing and building.\n\n" | |
60f067b4 JS |
172 | " -h --help Show this help\n" |
173 | " --version Print version string\n" | |
174 | " -q --quiet Do not show status information\n" | |
175 | " -D --directory=PATH Root directory for the container\n" | |
176 | " -i --image=PATH File system device or image for the container\n" | |
177 | " -b --boot Boot up full system (i.e. invoke init)\n" | |
178 | " -u --user=USER Run the command under specified user or uid\n" | |
179 | " -M --machine=NAME Set the machine name for the container\n" | |
180 | " --uuid=UUID Set a specific machine UUID for the container\n" | |
181 | " -S --slice=SLICE Place the container in the specified slice\n" | |
182 | " --private-network Disable network in container\n" | |
183 | " --network-interface=INTERFACE\n" | |
184 | " Assign an existing network interface to the\n" | |
185 | " container\n" | |
186 | " --network-macvlan=INTERFACE\n" | |
187 | " Create a macvlan network interface based on an\n" | |
188 | " existing network interface to the container\n" | |
189 | " --network-veth Add a virtual ethernet connection between host\n" | |
190 | " and container\n" | |
191 | " --network-bridge=INTERFACE\n" | |
192 | " Add a virtual ethernet connection between host\n" | |
193 | " and container and add it to an existing bridge on\n" | |
194 | " the host\n" | |
195 | " -Z --selinux-context=SECLABEL\n" | |
196 | " Set the SELinux security context to be used by\n" | |
197 | " processes in the container\n" | |
198 | " -L --selinux-apifs-context=SECLABEL\n" | |
199 | " Set the SELinux security context to be used by\n" | |
200 | " API/tmpfs file systems in the container\n" | |
201 | " --capability=CAP In addition to the default, retain specified\n" | |
202 | " capability\n" | |
203 | " --drop-capability=CAP Drop the specified capability from the default set\n" | |
204 | " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n" | |
205 | " -j Equivalent to --link-journal=host\n" | |
206 | " --read-only Mount the root directory read-only\n" | |
207 | " --bind=PATH[:PATH] Bind mount a file or directory from the host into\n" | |
208 | " the container\n" | |
209 | " --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n" | |
210 | " --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n" | |
211 | " --setenv=NAME=VALUE Pass an environment variable to PID 1\n" | |
212 | " --share-system Share system namespaces with host\n" | |
213 | " --register=BOOLEAN Register container as machine\n" | |
214 | " --keep-unit Do not register a scope for the machine, reuse\n" | |
5eef597e MP |
215 | " the service unit nspawn is running in\n" |
216 | " --volatile[=MODE] Run the system in volatile mode\n", | |
663996b3 | 217 | program_invocation_short_name); |
663996b3 MS |
218 | } |
219 | ||
220 | static int parse_argv(int argc, char *argv[]) { | |
221 | ||
222 | enum { | |
223 | ARG_VERSION = 0x100, | |
224 | ARG_PRIVATE_NETWORK, | |
225 | ARG_UUID, | |
226 | ARG_READ_ONLY, | |
227 | ARG_CAPABILITY, | |
60f067b4 | 228 | ARG_DROP_CAPABILITY, |
663996b3 MS |
229 | ARG_LINK_JOURNAL, |
230 | ARG_BIND, | |
60f067b4 JS |
231 | ARG_BIND_RO, |
232 | ARG_TMPFS, | |
233 | ARG_SETENV, | |
234 | ARG_SHARE_SYSTEM, | |
235 | ARG_REGISTER, | |
236 | ARG_KEEP_UNIT, | |
237 | ARG_NETWORK_INTERFACE, | |
238 | ARG_NETWORK_MACVLAN, | |
239 | ARG_NETWORK_VETH, | |
240 | ARG_NETWORK_BRIDGE, | |
241 | ARG_PERSONALITY, | |
5eef597e | 242 | ARG_VOLATILE, |
663996b3 MS |
243 | }; |
244 | ||
245 | static const struct option options[] = { | |
60f067b4 JS |
246 | { "help", no_argument, NULL, 'h' }, |
247 | { "version", no_argument, NULL, ARG_VERSION }, | |
248 | { "directory", required_argument, NULL, 'D' }, | |
249 | { "user", required_argument, NULL, 'u' }, | |
250 | { "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK }, | |
251 | { "boot", no_argument, NULL, 'b' }, | |
252 | { "uuid", required_argument, NULL, ARG_UUID }, | |
253 | { "read-only", no_argument, NULL, ARG_READ_ONLY }, | |
254 | { "capability", required_argument, NULL, ARG_CAPABILITY }, | |
255 | { "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY }, | |
256 | { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL }, | |
257 | { "bind", required_argument, NULL, ARG_BIND }, | |
258 | { "bind-ro", required_argument, NULL, ARG_BIND_RO }, | |
259 | { "tmpfs", required_argument, NULL, ARG_TMPFS }, | |
260 | { "machine", required_argument, NULL, 'M' }, | |
261 | { "slice", required_argument, NULL, 'S' }, | |
262 | { "setenv", required_argument, NULL, ARG_SETENV }, | |
263 | { "selinux-context", required_argument, NULL, 'Z' }, | |
264 | { "selinux-apifs-context", required_argument, NULL, 'L' }, | |
265 | { "quiet", no_argument, NULL, 'q' }, | |
266 | { "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, | |
267 | { "register", required_argument, NULL, ARG_REGISTER }, | |
268 | { "keep-unit", no_argument, NULL, ARG_KEEP_UNIT }, | |
269 | { "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE }, | |
270 | { "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN }, | |
271 | { "network-veth", no_argument, NULL, ARG_NETWORK_VETH }, | |
272 | { "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE }, | |
273 | { "personality", required_argument, NULL, ARG_PERSONALITY }, | |
274 | { "image", required_argument, NULL, 'i' }, | |
5eef597e | 275 | { "volatile", optional_argument, NULL, ARG_VOLATILE }, |
60f067b4 | 276 | {} |
663996b3 MS |
277 | }; |
278 | ||
14228c0d | 279 | int c, r; |
60f067b4 | 280 | uint64_t plus = 0, minus = 0; |
663996b3 MS |
281 | |
282 | assert(argc >= 0); | |
283 | assert(argv); | |
284 | ||
5eef597e | 285 | while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:", options, NULL)) >= 0) |
663996b3 MS |
286 | |
287 | switch (c) { | |
288 | ||
289 | case 'h': | |
5eef597e MP |
290 | help(); |
291 | return 0; | |
663996b3 MS |
292 | |
293 | case ARG_VERSION: | |
294 | puts(PACKAGE_STRING); | |
295 | puts(SYSTEMD_FEATURES); | |
296 | return 0; | |
297 | ||
298 | case 'D': | |
299 | free(arg_directory); | |
300 | arg_directory = canonicalize_file_name(optarg); | |
301 | if (!arg_directory) { | |
60f067b4 | 302 | log_error("Invalid root directory: %m"); |
663996b3 MS |
303 | return -ENOMEM; |
304 | } | |
305 | ||
306 | break; | |
307 | ||
60f067b4 JS |
308 | case 'i': |
309 | arg_image = optarg; | |
310 | break; | |
311 | ||
663996b3 MS |
312 | case 'u': |
313 | free(arg_user); | |
314 | arg_user = strdup(optarg); | |
315 | if (!arg_user) | |
316 | return log_oom(); | |
317 | ||
318 | break; | |
319 | ||
60f067b4 JS |
320 | case ARG_NETWORK_BRIDGE: |
321 | arg_network_bridge = optarg; | |
322 | ||
323 | /* fall through */ | |
324 | ||
325 | case ARG_NETWORK_VETH: | |
326 | arg_network_veth = true; | |
327 | arg_private_network = true; | |
328 | break; | |
329 | ||
330 | case ARG_NETWORK_INTERFACE: | |
331 | if (strv_extend(&arg_network_interfaces, optarg) < 0) | |
332 | return log_oom(); | |
333 | ||
334 | arg_private_network = true; | |
335 | break; | |
336 | ||
337 | case ARG_NETWORK_MACVLAN: | |
338 | if (strv_extend(&arg_network_macvlan, optarg) < 0) | |
339 | return log_oom(); | |
340 | ||
341 | /* fall through */ | |
342 | ||
663996b3 MS |
343 | case ARG_PRIVATE_NETWORK: |
344 | arg_private_network = true; | |
345 | break; | |
346 | ||
347 | case 'b': | |
348 | arg_boot = true; | |
349 | break; | |
350 | ||
351 | case ARG_UUID: | |
14228c0d MB |
352 | r = sd_id128_from_string(optarg, &arg_uuid); |
353 | if (r < 0) { | |
663996b3 | 354 | log_error("Invalid UUID: %s", optarg); |
14228c0d | 355 | return r; |
663996b3 | 356 | } |
14228c0d | 357 | break; |
663996b3 | 358 | |
14228c0d | 359 | case 'S': |
60f067b4 | 360 | arg_slice = optarg; |
663996b3 MS |
361 | break; |
362 | ||
363 | case 'M': | |
60f067b4 JS |
364 | if (isempty(optarg)) { |
365 | free(arg_machine); | |
366 | arg_machine = NULL; | |
367 | } else { | |
368 | ||
369 | if (!hostname_is_valid(optarg)) { | |
370 | log_error("Invalid machine name: %s", optarg); | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | free(arg_machine); | |
375 | arg_machine = strdup(optarg); | |
376 | if (!arg_machine) | |
377 | return log_oom(); | |
378 | ||
379 | break; | |
663996b3 MS |
380 | } |
381 | ||
60f067b4 JS |
382 | case 'Z': |
383 | arg_selinux_context = optarg; | |
384 | break; | |
663996b3 | 385 | |
60f067b4 JS |
386 | case 'L': |
387 | arg_selinux_apifs_context = optarg; | |
663996b3 MS |
388 | break; |
389 | ||
390 | case ARG_READ_ONLY: | |
391 | arg_read_only = true; | |
392 | break; | |
393 | ||
60f067b4 JS |
394 | case ARG_CAPABILITY: |
395 | case ARG_DROP_CAPABILITY: { | |
5eef597e | 396 | const char *state, *word; |
663996b3 MS |
397 | size_t length; |
398 | ||
399 | FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) { | |
60f067b4 | 400 | _cleanup_free_ char *t; |
663996b3 | 401 | cap_value_t cap; |
663996b3 MS |
402 | |
403 | t = strndup(word, length); | |
404 | if (!t) | |
405 | return log_oom(); | |
406 | ||
60f067b4 JS |
407 | if (streq(t, "all")) { |
408 | if (c == ARG_CAPABILITY) | |
409 | plus = (uint64_t) -1; | |
410 | else | |
411 | minus = (uint64_t) -1; | |
412 | } else { | |
413 | if (cap_from_name(t, &cap) < 0) { | |
414 | log_error("Failed to parse capability %s.", t); | |
415 | return -EINVAL; | |
416 | } | |
663996b3 | 417 | |
60f067b4 JS |
418 | if (c == ARG_CAPABILITY) |
419 | plus |= 1ULL << (uint64_t) cap; | |
420 | else | |
421 | minus |= 1ULL << (uint64_t) cap; | |
422 | } | |
663996b3 MS |
423 | } |
424 | ||
425 | break; | |
426 | } | |
427 | ||
428 | case 'j': | |
429 | arg_link_journal = LINK_GUEST; | |
430 | break; | |
431 | ||
432 | case ARG_LINK_JOURNAL: | |
433 | if (streq(optarg, "auto")) | |
434 | arg_link_journal = LINK_AUTO; | |
435 | else if (streq(optarg, "no")) | |
436 | arg_link_journal = LINK_NO; | |
437 | else if (streq(optarg, "guest")) | |
438 | arg_link_journal = LINK_GUEST; | |
439 | else if (streq(optarg, "host")) | |
440 | arg_link_journal = LINK_HOST; | |
441 | else { | |
442 | log_error("Failed to parse link journal mode %s", optarg); | |
443 | return -EINVAL; | |
444 | } | |
445 | ||
446 | break; | |
447 | ||
448 | case ARG_BIND: | |
449 | case ARG_BIND_RO: { | |
450 | _cleanup_free_ char *a = NULL, *b = NULL; | |
451 | char *e; | |
452 | char ***x; | |
663996b3 MS |
453 | |
454 | x = c == ARG_BIND ? &arg_bind : &arg_bind_ro; | |
455 | ||
456 | e = strchr(optarg, ':'); | |
457 | if (e) { | |
458 | a = strndup(optarg, e - optarg); | |
459 | b = strdup(e + 1); | |
460 | } else { | |
461 | a = strdup(optarg); | |
462 | b = strdup(optarg); | |
463 | } | |
464 | ||
465 | if (!a || !b) | |
466 | return log_oom(); | |
467 | ||
468 | if (!path_is_absolute(a) || !path_is_absolute(b)) { | |
469 | log_error("Invalid bind mount specification: %s", optarg); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | r = strv_extend(x, a); | |
474 | if (r < 0) | |
60f067b4 | 475 | return log_oom(); |
663996b3 MS |
476 | |
477 | r = strv_extend(x, b); | |
478 | if (r < 0) | |
60f067b4 JS |
479 | return log_oom(); |
480 | ||
481 | break; | |
482 | } | |
483 | ||
484 | case ARG_TMPFS: { | |
485 | _cleanup_free_ char *a = NULL, *b = NULL; | |
486 | char *e; | |
487 | ||
488 | e = strchr(optarg, ':'); | |
489 | if (e) { | |
490 | a = strndup(optarg, e - optarg); | |
491 | b = strdup(e + 1); | |
492 | } else { | |
493 | a = strdup(optarg); | |
494 | b = strdup("mode=0755"); | |
495 | } | |
496 | ||
497 | if (!a || !b) | |
498 | return log_oom(); | |
499 | ||
500 | if (!path_is_absolute(a)) { | |
501 | log_error("Invalid tmpfs specification: %s", optarg); | |
502 | return -EINVAL; | |
503 | } | |
504 | ||
505 | r = strv_push(&arg_tmpfs, a); | |
506 | if (r < 0) | |
507 | return log_oom(); | |
508 | ||
509 | a = NULL; | |
510 | ||
511 | r = strv_push(&arg_tmpfs, b); | |
512 | if (r < 0) | |
513 | return log_oom(); | |
514 | ||
515 | b = NULL; | |
516 | ||
517 | break; | |
518 | } | |
519 | ||
520 | case ARG_SETENV: { | |
521 | char **n; | |
522 | ||
523 | if (!env_assignment_is_valid(optarg)) { | |
524 | log_error("Environment variable assignment '%s' is not valid.", optarg); | |
525 | return -EINVAL; | |
526 | } | |
527 | ||
528 | n = strv_env_set(arg_setenv, optarg); | |
529 | if (!n) | |
530 | return log_oom(); | |
663996b3 | 531 | |
60f067b4 JS |
532 | strv_free(arg_setenv); |
533 | arg_setenv = n; | |
663996b3 MS |
534 | break; |
535 | } | |
536 | ||
60f067b4 JS |
537 | case 'q': |
538 | arg_quiet = true; | |
539 | break; | |
540 | ||
541 | case ARG_SHARE_SYSTEM: | |
542 | arg_share_system = true; | |
543 | break; | |
544 | ||
545 | case ARG_REGISTER: | |
546 | r = parse_boolean(optarg); | |
547 | if (r < 0) { | |
548 | log_error("Failed to parse --register= argument: %s", optarg); | |
549 | return r; | |
550 | } | |
551 | ||
552 | arg_register = r; | |
553 | break; | |
554 | ||
555 | case ARG_KEEP_UNIT: | |
556 | arg_keep_unit = true; | |
557 | break; | |
558 | ||
559 | case ARG_PERSONALITY: | |
560 | ||
561 | arg_personality = personality_from_string(optarg); | |
562 | if (arg_personality == 0xffffffffLU) { | |
563 | log_error("Unknown or unsupported personality '%s'.", optarg); | |
564 | return -EINVAL; | |
565 | } | |
566 | ||
567 | break; | |
568 | ||
5eef597e MP |
569 | case ARG_VOLATILE: |
570 | ||
571 | if (!optarg) | |
572 | arg_volatile = VOLATILE_YES; | |
573 | else { | |
574 | r = parse_boolean(optarg); | |
575 | if (r < 0) { | |
576 | if (streq(optarg, "state")) | |
577 | arg_volatile = VOLATILE_STATE; | |
578 | else { | |
579 | log_error("Failed to parse --volatile= argument: %s", optarg); | |
580 | return r; | |
581 | } | |
582 | } else | |
583 | arg_volatile = r ? VOLATILE_YES : VOLATILE_NO; | |
584 | } | |
585 | ||
586 | break; | |
587 | ||
663996b3 MS |
588 | case '?': |
589 | return -EINVAL; | |
590 | ||
591 | default: | |
60f067b4 | 592 | assert_not_reached("Unhandled option"); |
663996b3 | 593 | } |
663996b3 | 594 | |
60f067b4 JS |
595 | if (arg_share_system) |
596 | arg_register = false; | |
597 | ||
598 | if (arg_boot && arg_share_system) { | |
599 | log_error("--boot and --share-system may not be combined."); | |
600 | return -EINVAL; | |
601 | } | |
602 | ||
603 | if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) { | |
604 | log_error("--keep-unit may not be used when invoked from a user session."); | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | if (arg_directory && arg_image) { | |
609 | log_error("--directory= and --image= may not be combined."); | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
5eef597e MP |
613 | if (arg_volatile != VOLATILE_NO && arg_read_only) { |
614 | log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy."); | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
60f067b4 JS |
618 | arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus; |
619 | ||
663996b3 MS |
620 | return 1; |
621 | } | |
622 | ||
623 | static int mount_all(const char *dest) { | |
624 | ||
625 | typedef struct MountPoint { | |
626 | const char *what; | |
627 | const char *where; | |
628 | const char *type; | |
629 | const char *options; | |
630 | unsigned long flags; | |
631 | bool fatal; | |
632 | } MountPoint; | |
633 | ||
634 | static const MountPoint mount_table[] = { | |
60f067b4 JS |
635 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, |
636 | { "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */ | |
637 | { NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */ | |
638 | { "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, | |
639 | { "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true }, | |
663996b3 | 640 | { "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true }, |
60f067b4 JS |
641 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true }, |
642 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true }, | |
663996b3 | 643 | #ifdef HAVE_SELINUX |
60f067b4 JS |
644 | { "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */ |
645 | { NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */ | |
663996b3 MS |
646 | #endif |
647 | }; | |
648 | ||
649 | unsigned k; | |
650 | int r = 0; | |
651 | ||
652 | for (k = 0; k < ELEMENTSOF(mount_table); k++) { | |
653 | _cleanup_free_ char *where = NULL; | |
60f067b4 JS |
654 | #ifdef HAVE_SELINUX |
655 | _cleanup_free_ char *options = NULL; | |
656 | #endif | |
657 | const char *o; | |
663996b3 MS |
658 | int t; |
659 | ||
660 | where = strjoin(dest, "/", mount_table[k].where, NULL); | |
661 | if (!where) | |
662 | return log_oom(); | |
663 | ||
664 | t = path_is_mount_point(where, true); | |
665 | if (t < 0) { | |
666 | log_error("Failed to detect whether %s is a mount point: %s", where, strerror(-t)); | |
667 | ||
668 | if (r == 0) | |
669 | r = t; | |
670 | ||
671 | continue; | |
672 | } | |
673 | ||
674 | /* Skip this entry if it is not a remount. */ | |
675 | if (mount_table[k].what && t > 0) | |
676 | continue; | |
677 | ||
5eef597e MP |
678 | t = mkdir_p(where, 0755); |
679 | if (t < 0) { | |
680 | if (mount_table[k].fatal) { | |
681 | log_error("Failed to create directory %s: %s", where, strerror(-t)); | |
682 | ||
683 | if (r == 0) | |
684 | r = t; | |
685 | } else | |
686 | log_warning("Failed to create directory %s: %s", where, strerror(-t)); | |
687 | ||
688 | continue; | |
689 | } | |
663996b3 | 690 | |
60f067b4 JS |
691 | #ifdef HAVE_SELINUX |
692 | if (arg_selinux_apifs_context && | |
693 | (streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) { | |
694 | options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL); | |
695 | if (!options) | |
696 | return log_oom(); | |
697 | ||
698 | o = options; | |
699 | } else | |
700 | #endif | |
701 | o = mount_table[k].options; | |
702 | ||
703 | ||
663996b3 MS |
704 | if (mount(mount_table[k].what, |
705 | where, | |
706 | mount_table[k].type, | |
707 | mount_table[k].flags, | |
5eef597e | 708 | o) < 0) { |
663996b3 | 709 | |
5eef597e MP |
710 | if (mount_table[k].fatal) { |
711 | log_error("mount(%s) failed: %m", where); | |
663996b3 | 712 | |
5eef597e MP |
713 | if (r == 0) |
714 | r = -errno; | |
715 | } else | |
716 | log_warning("mount(%s) failed: %m", where); | |
663996b3 MS |
717 | } |
718 | } | |
719 | ||
720 | return r; | |
721 | } | |
722 | ||
60f067b4 | 723 | static int mount_binds(const char *dest, char **l, bool ro) { |
663996b3 MS |
724 | char **x, **y; |
725 | ||
726 | STRV_FOREACH_PAIR(x, y, l) { | |
727 | _cleanup_free_ char *where = NULL; | |
14228c0d | 728 | struct stat source_st, dest_st; |
60f067b4 | 729 | int r; |
14228c0d MB |
730 | |
731 | if (stat(*x, &source_st) < 0) { | |
60f067b4 | 732 | log_error("Failed to stat %s: %m", *x); |
14228c0d MB |
733 | return -errno; |
734 | } | |
663996b3 | 735 | |
60f067b4 | 736 | where = strappend(dest, *y); |
663996b3 MS |
737 | if (!where) |
738 | return log_oom(); | |
739 | ||
60f067b4 JS |
740 | r = stat(where, &dest_st); |
741 | if (r == 0) { | |
14228c0d | 742 | if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) { |
60f067b4 | 743 | log_error("The file types of %s and %s do not match. Refusing bind mount", *x, where); |
14228c0d MB |
744 | return -EINVAL; |
745 | } | |
60f067b4 JS |
746 | } else if (errno == ENOENT) { |
747 | r = mkdir_parents_label(where, 0755); | |
748 | if (r < 0) { | |
749 | log_error("Failed to bind mount %s: %s", *x, strerror(-r)); | |
750 | return r; | |
14228c0d | 751 | } |
60f067b4 JS |
752 | } else { |
753 | log_error("Failed to bind mount %s: %m", *x); | |
754 | return -errno; | |
755 | } | |
756 | ||
757 | /* Create the mount point, but be conservative -- refuse to create block | |
5eef597e MP |
758 | * and char devices. */ |
759 | if (S_ISDIR(source_st.st_mode)) { | |
760 | r = mkdir_label(where, 0755); | |
761 | if (r < 0) { | |
762 | log_error("Failed to create mount point %s: %s", where, strerror(-r)); | |
763 | ||
764 | return r; | |
765 | } | |
766 | } else if (S_ISFIFO(source_st.st_mode)) { | |
767 | r = mkfifo(where, 0644); | |
768 | if (r < 0 && errno != EEXIST) { | |
769 | log_error("Failed to create mount point %s: %m", where); | |
770 | ||
771 | return -errno; | |
772 | } | |
773 | } else if (S_ISSOCK(source_st.st_mode)) { | |
774 | r = mknod(where, 0644 | S_IFSOCK, 0); | |
775 | if (r < 0 && errno != EEXIST) { | |
776 | log_error("Failed to create mount point %s: %m", where); | |
777 | ||
778 | return -errno; | |
779 | } | |
780 | } else if (S_ISREG(source_st.st_mode)) { | |
781 | r = touch(where); | |
782 | if (r < 0) { | |
783 | log_error("Failed to create mount point %s: %s", where, strerror(-r)); | |
784 | ||
785 | return r; | |
786 | } | |
787 | } else { | |
60f067b4 JS |
788 | log_error("Refusing to create mountpoint for file: %s", *x); |
789 | return -ENOTSUP; | |
14228c0d | 790 | } |
663996b3 MS |
791 | |
792 | if (mount(*x, where, "bind", MS_BIND, NULL) < 0) { | |
793 | log_error("mount(%s) failed: %m", where); | |
794 | return -errno; | |
795 | } | |
796 | ||
60f067b4 JS |
797 | if (ro) { |
798 | r = bind_remount_recursive(where, true); | |
799 | if (r < 0) { | |
800 | log_error("Read-Only bind mount failed: %s", strerror(-r)); | |
801 | return r; | |
802 | } | |
803 | } | |
804 | } | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | static int mount_tmpfs(const char *dest) { | |
810 | char **i, **o; | |
811 | ||
812 | STRV_FOREACH_PAIR(i, o, arg_tmpfs) { | |
813 | _cleanup_free_ char *where = NULL; | |
5eef597e | 814 | int r; |
60f067b4 JS |
815 | |
816 | where = strappend(dest, *i); | |
817 | if (!where) | |
818 | return log_oom(); | |
819 | ||
5eef597e MP |
820 | r = mkdir_label(where, 0755); |
821 | if (r < 0) { | |
822 | log_error("creating mount point for tmpfs %s failed: %s", where, strerror(-r)); | |
823 | ||
824 | return r; | |
825 | } | |
60f067b4 JS |
826 | |
827 | if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, *o) < 0) { | |
828 | log_error("tmpfs mount to %s failed: %m", where); | |
663996b3 MS |
829 | return -errno; |
830 | } | |
831 | } | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | static int setup_timezone(const char *dest) { | |
837 | _cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL; | |
838 | char *z, *y; | |
839 | int r; | |
840 | ||
841 | assert(dest); | |
842 | ||
843 | /* Fix the timezone, if possible */ | |
844 | r = readlink_malloc("/etc/localtime", &p); | |
845 | if (r < 0) { | |
846 | log_warning("/etc/localtime is not a symlink, not updating container timezone."); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | z = path_startswith(p, "../usr/share/zoneinfo/"); | |
851 | if (!z) | |
852 | z = path_startswith(p, "/usr/share/zoneinfo/"); | |
853 | if (!z) { | |
854 | log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone."); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | where = strappend(dest, "/etc/localtime"); | |
859 | if (!where) | |
860 | return log_oom(); | |
861 | ||
862 | r = readlink_malloc(where, &q); | |
863 | if (r >= 0) { | |
864 | y = path_startswith(q, "../usr/share/zoneinfo/"); | |
865 | if (!y) | |
866 | y = path_startswith(q, "/usr/share/zoneinfo/"); | |
867 | ||
663996b3 MS |
868 | /* Already pointing to the right place? Then do nothing .. */ |
869 | if (y && streq(y, z)) | |
870 | return 0; | |
871 | } | |
872 | ||
873 | check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL); | |
874 | if (!check) | |
875 | return log_oom(); | |
876 | ||
877 | if (access(check, F_OK) < 0) { | |
878 | log_warning("Timezone %s does not exist in container, not updating container timezone.", z); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | what = strappend("../usr/share/zoneinfo/", z); | |
883 | if (!what) | |
884 | return log_oom(); | |
885 | ||
5eef597e MP |
886 | r = mkdir_parents(where, 0755); |
887 | if (r < 0) { | |
888 | log_error("Failed to create directory for timezone info %s in container: %s", where, strerror(-r)); | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | r = unlink(where); | |
894 | if (r < 0 && errno != ENOENT) { | |
895 | log_error("Failed to remove existing timezone info %s in container: %m", where); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
663996b3 MS |
900 | if (symlink(what, where) < 0) { |
901 | log_error("Failed to correct timezone of container: %m"); | |
902 | return 0; | |
903 | } | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | static int setup_resolv_conf(const char *dest) { | |
e842803a | 909 | _cleanup_free_ char *where = NULL; |
5eef597e | 910 | int r; |
663996b3 MS |
911 | |
912 | assert(dest); | |
913 | ||
914 | if (arg_private_network) | |
915 | return 0; | |
916 | ||
917 | /* Fix resolv.conf, if possible */ | |
918 | where = strappend(dest, "/etc/resolv.conf"); | |
919 | if (!where) | |
920 | return log_oom(); | |
921 | ||
663996b3 MS |
922 | /* We don't really care for the results of this really. If it |
923 | * fails, it fails, but meh... */ | |
5eef597e MP |
924 | r = mkdir_parents(where, 0755); |
925 | if (r < 0) { | |
926 | log_warning("Failed to create parent directory for resolv.conf %s: %s", where, strerror(-r)); | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
931 | r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644); | |
932 | if (r < 0) { | |
933 | log_warning("Failed to copy /etc/resolv.conf to %s: %s", where, strerror(-r)); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
941 | static int setup_volatile_state(const char *directory) { | |
942 | const char *p; | |
943 | int r; | |
944 | ||
945 | assert(directory); | |
946 | ||
947 | if (arg_volatile != VOLATILE_STATE) | |
948 | return 0; | |
949 | ||
950 | /* --volatile=state means we simply overmount /var | |
951 | with a tmpfs, and the rest read-only. */ | |
952 | ||
953 | r = bind_remount_recursive(directory, true); | |
954 | if (r < 0) { | |
955 | log_error("Failed to remount %s read-only: %s", directory, strerror(-r)); | |
956 | return r; | |
957 | } | |
958 | ||
959 | p = strappenda(directory, "/var"); | |
960 | r = mkdir(p, 0755); | |
961 | if (r < 0 && errno != EEXIST) { | |
962 | log_error("Failed to create %s: %m", directory); | |
963 | return -errno; | |
964 | } | |
965 | ||
966 | if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, "mode=755") < 0) { | |
967 | log_error("Failed to mount tmpfs to /var: %m"); | |
968 | return -errno; | |
969 | } | |
663996b3 MS |
970 | |
971 | return 0; | |
972 | } | |
973 | ||
5eef597e MP |
974 | static int setup_volatile(const char *directory) { |
975 | bool tmpfs_mounted = false, bind_mounted = false; | |
976 | char template[] = "/tmp/nspawn-volatile-XXXXXX"; | |
977 | const char *f, *t; | |
978 | int r; | |
979 | ||
980 | assert(directory); | |
981 | ||
982 | if (arg_volatile != VOLATILE_YES) | |
983 | return 0; | |
984 | ||
985 | /* --volatile=yes means we mount a tmpfs to the root dir, and | |
986 | the original /usr to use inside it, and that read-only. */ | |
987 | ||
988 | if (!mkdtemp(template)) { | |
989 | log_error("Failed to create temporary directory: %m"); | |
990 | return -errno; | |
991 | } | |
992 | ||
993 | if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, "mode=755") < 0) { | |
994 | log_error("Failed to mount tmpfs for root directory: %m"); | |
995 | r = -errno; | |
996 | goto fail; | |
997 | } | |
998 | ||
999 | tmpfs_mounted = true; | |
1000 | ||
1001 | f = strappenda(directory, "/usr"); | |
1002 | t = strappenda(template, "/usr"); | |
1003 | ||
1004 | r = mkdir(t, 0755); | |
1005 | if (r < 0 && errno != EEXIST) { | |
1006 | log_error("Failed to create %s: %m", t); | |
1007 | r = -errno; | |
1008 | goto fail; | |
1009 | } | |
1010 | ||
1011 | if (mount(f, t, "bind", MS_BIND|MS_REC, NULL) < 0) { | |
1012 | log_error("Failed to create /usr bind mount: %m"); | |
1013 | r = -errno; | |
1014 | goto fail; | |
1015 | } | |
1016 | ||
1017 | bind_mounted = true; | |
1018 | ||
1019 | r = bind_remount_recursive(t, true); | |
1020 | if (r < 0) { | |
1021 | log_error("Failed to remount %s read-only: %s", t, strerror(-r)); | |
1022 | goto fail; | |
1023 | } | |
1024 | ||
1025 | if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) { | |
1026 | log_error("Failed to move root mount: %m"); | |
1027 | r = -errno; | |
1028 | goto fail; | |
1029 | } | |
1030 | ||
1031 | rmdir(template); | |
1032 | ||
1033 | return 0; | |
1034 | ||
1035 | fail: | |
1036 | if (bind_mounted) | |
1037 | umount(t); | |
1038 | if (tmpfs_mounted) | |
1039 | umount(template); | |
1040 | rmdir(template); | |
1041 | return r; | |
1042 | } | |
1043 | ||
60f067b4 JS |
1044 | static char* id128_format_as_uuid(sd_id128_t id, char s[37]) { |
1045 | ||
1046 | snprintf(s, 37, | |
1047 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1048 | SD_ID128_FORMAT_VAL(id)); | |
1049 | ||
1050 | return s; | |
1051 | } | |
1052 | ||
663996b3 MS |
1053 | static int setup_boot_id(const char *dest) { |
1054 | _cleanup_free_ char *from = NULL, *to = NULL; | |
60f067b4 | 1055 | sd_id128_t rnd = {}; |
663996b3 MS |
1056 | char as_uuid[37]; |
1057 | int r; | |
1058 | ||
1059 | assert(dest); | |
1060 | ||
60f067b4 JS |
1061 | if (arg_share_system) |
1062 | return 0; | |
1063 | ||
663996b3 MS |
1064 | /* Generate a new randomized boot ID, so that each boot-up of |
1065 | * the container gets a new one */ | |
1066 | ||
1067 | from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id"); | |
1068 | to = strappend(dest, "/proc/sys/kernel/random/boot_id"); | |
1069 | if (!from || !to) | |
1070 | return log_oom(); | |
1071 | ||
1072 | r = sd_id128_randomize(&rnd); | |
1073 | if (r < 0) { | |
1074 | log_error("Failed to generate random boot id: %s", strerror(-r)); | |
1075 | return r; | |
1076 | } | |
1077 | ||
60f067b4 | 1078 | id128_format_as_uuid(rnd, as_uuid); |
663996b3 MS |
1079 | |
1080 | r = write_string_file(from, as_uuid); | |
1081 | if (r < 0) { | |
1082 | log_error("Failed to write boot id: %s", strerror(-r)); | |
1083 | return r; | |
1084 | } | |
1085 | ||
1086 | if (mount(from, to, "bind", MS_BIND, NULL) < 0) { | |
1087 | log_error("Failed to bind mount boot id: %m"); | |
1088 | r = -errno; | |
1089 | } else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL)) | |
1090 | log_warning("Failed to make boot id read-only: %m"); | |
1091 | ||
1092 | unlink(from); | |
1093 | return r; | |
1094 | } | |
1095 | ||
1096 | static int copy_devnodes(const char *dest) { | |
1097 | ||
1098 | static const char devnodes[] = | |
1099 | "null\0" | |
1100 | "zero\0" | |
1101 | "full\0" | |
1102 | "random\0" | |
1103 | "urandom\0" | |
5eef597e MP |
1104 | "tty\0" |
1105 | "net/tun\0"; | |
663996b3 MS |
1106 | |
1107 | const char *d; | |
1108 | int r = 0; | |
1109 | _cleanup_umask_ mode_t u; | |
1110 | ||
1111 | assert(dest); | |
1112 | ||
1113 | u = umask(0000); | |
1114 | ||
1115 | NULSTR_FOREACH(d, devnodes) { | |
663996b3 | 1116 | _cleanup_free_ char *from = NULL, *to = NULL; |
60f067b4 | 1117 | struct stat st; |
663996b3 | 1118 | |
60f067b4 JS |
1119 | from = strappend("/dev/", d); |
1120 | to = strjoin(dest, "/dev/", d, NULL); | |
1121 | if (!from || !to) | |
1122 | return log_oom(); | |
663996b3 MS |
1123 | |
1124 | if (stat(from, &st) < 0) { | |
1125 | ||
1126 | if (errno != ENOENT) { | |
1127 | log_error("Failed to stat %s: %m", from); | |
60f067b4 | 1128 | return -errno; |
663996b3 MS |
1129 | } |
1130 | ||
1131 | } else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { | |
1132 | ||
1133 | log_error("%s is not a char or block device, cannot copy", from); | |
60f067b4 | 1134 | return -EIO; |
663996b3 | 1135 | |
5eef597e MP |
1136 | } else { |
1137 | r = mkdir_parents(to, 0775); | |
1138 | if (r < 0) { | |
1139 | log_error("Failed to create parent directory of %s: %s", to, strerror(-r)); | |
1140 | return -r; | |
1141 | } | |
663996b3 | 1142 | |
5eef597e MP |
1143 | if (mknod(to, st.st_mode, st.st_rdev) < 0) { |
1144 | log_error("mknod(%s) failed: %m", dest); | |
1145 | return -errno; | |
1146 | } | |
663996b3 MS |
1147 | } |
1148 | } | |
1149 | ||
1150 | return r; | |
1151 | } | |
1152 | ||
1153 | static int setup_ptmx(const char *dest) { | |
1154 | _cleanup_free_ char *p = NULL; | |
1155 | ||
1156 | p = strappend(dest, "/dev/ptmx"); | |
1157 | if (!p) | |
1158 | return log_oom(); | |
1159 | ||
1160 | if (symlink("pts/ptmx", p) < 0) { | |
1161 | log_error("Failed to create /dev/ptmx symlink: %m"); | |
1162 | return -errno; | |
1163 | } | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static int setup_dev_console(const char *dest, const char *console) { | |
60f067b4 JS |
1169 | _cleanup_umask_ mode_t u; |
1170 | const char *to; | |
663996b3 | 1171 | struct stat st; |
663996b3 | 1172 | int r; |
663996b3 MS |
1173 | |
1174 | assert(dest); | |
1175 | assert(console); | |
1176 | ||
1177 | u = umask(0000); | |
1178 | ||
60f067b4 JS |
1179 | if (stat("/dev/null", &st) < 0) { |
1180 | log_error("Failed to stat /dev/null: %m"); | |
663996b3 | 1181 | return -errno; |
663996b3 MS |
1182 | } |
1183 | ||
1184 | r = chmod_and_chown(console, 0600, 0, 0); | |
1185 | if (r < 0) { | |
1186 | log_error("Failed to correct access mode for TTY: %s", strerror(-r)); | |
1187 | return r; | |
1188 | } | |
1189 | ||
663996b3 MS |
1190 | /* We need to bind mount the right tty to /dev/console since |
1191 | * ptys can only exist on pts file systems. To have something | |
60f067b4 JS |
1192 | * to bind mount things on we create a device node first, and |
1193 | * use /dev/null for that since we the cgroups device policy | |
1194 | * allows us to create that freely, while we cannot create | |
1195 | * /dev/console. (Note that the major minor doesn't actually | |
1196 | * matter here, since we mount it over anyway). */ | |
663996b3 | 1197 | |
60f067b4 | 1198 | to = strappenda(dest, "/dev/console"); |
663996b3 MS |
1199 | if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0) { |
1200 | log_error("mknod() for /dev/console failed: %m"); | |
1201 | return -errno; | |
1202 | } | |
1203 | ||
1204 | if (mount(console, to, "bind", MS_BIND, NULL) < 0) { | |
1205 | log_error("Bind mount for /dev/console failed: %m"); | |
1206 | return -errno; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | static int setup_kmsg(const char *dest, int kmsg_socket) { | |
1213 | _cleanup_free_ char *from = NULL, *to = NULL; | |
1214 | int r, fd, k; | |
1215 | _cleanup_umask_ mode_t u; | |
1216 | union { | |
1217 | struct cmsghdr cmsghdr; | |
1218 | uint8_t buf[CMSG_SPACE(sizeof(int))]; | |
1219 | } control = {}; | |
1220 | struct msghdr mh = { | |
1221 | .msg_control = &control, | |
1222 | .msg_controllen = sizeof(control), | |
1223 | }; | |
1224 | struct cmsghdr *cmsg; | |
1225 | ||
1226 | assert(dest); | |
1227 | assert(kmsg_socket >= 0); | |
1228 | ||
1229 | u = umask(0000); | |
1230 | ||
1231 | /* We create the kmsg FIFO as /dev/kmsg, but immediately | |
1232 | * delete it after bind mounting it to /proc/kmsg. While FIFOs | |
1233 | * on the reading side behave very similar to /proc/kmsg, | |
1234 | * their writing side behaves differently from /dev/kmsg in | |
1235 | * that writing blocks when nothing is reading. In order to | |
1236 | * avoid any problems with containers deadlocking due to this | |
1237 | * we simply make /dev/kmsg unavailable to the container. */ | |
1238 | if (asprintf(&from, "%s/dev/kmsg", dest) < 0 || | |
1239 | asprintf(&to, "%s/proc/kmsg", dest) < 0) | |
1240 | return log_oom(); | |
1241 | ||
1242 | if (mkfifo(from, 0600) < 0) { | |
1243 | log_error("mkfifo() for /dev/kmsg failed: %m"); | |
1244 | return -errno; | |
1245 | } | |
1246 | ||
1247 | r = chmod_and_chown(from, 0600, 0, 0); | |
1248 | if (r < 0) { | |
1249 | log_error("Failed to correct access mode for /dev/kmsg: %s", strerror(-r)); | |
1250 | return r; | |
1251 | } | |
1252 | ||
1253 | if (mount(from, to, "bind", MS_BIND, NULL) < 0) { | |
1254 | log_error("Bind mount for /proc/kmsg failed: %m"); | |
1255 | return -errno; | |
1256 | } | |
1257 | ||
1258 | fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC); | |
1259 | if (fd < 0) { | |
1260 | log_error("Failed to open fifo: %m"); | |
1261 | return -errno; | |
1262 | } | |
1263 | ||
1264 | cmsg = CMSG_FIRSTHDR(&mh); | |
1265 | cmsg->cmsg_level = SOL_SOCKET; | |
1266 | cmsg->cmsg_type = SCM_RIGHTS; | |
1267 | cmsg->cmsg_len = CMSG_LEN(sizeof(int)); | |
1268 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); | |
1269 | ||
1270 | mh.msg_controllen = cmsg->cmsg_len; | |
1271 | ||
1272 | /* Store away the fd in the socket, so that it stays open as | |
1273 | * long as we run the child */ | |
1274 | k = sendmsg(kmsg_socket, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
60f067b4 | 1275 | safe_close(fd); |
663996b3 MS |
1276 | |
1277 | if (k < 0) { | |
1278 | log_error("Failed to send FIFO fd: %m"); | |
1279 | return -errno; | |
1280 | } | |
1281 | ||
1282 | /* And now make the FIFO unavailable as /dev/kmsg... */ | |
1283 | unlink(from); | |
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | static int setup_hostname(void) { | |
1288 | ||
60f067b4 JS |
1289 | if (arg_share_system) |
1290 | return 0; | |
1291 | ||
5eef597e | 1292 | if (sethostname_idempotent(arg_machine) < 0) |
663996b3 MS |
1293 | return -errno; |
1294 | ||
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | static int setup_journal(const char *directory) { | |
60f067b4 | 1299 | sd_id128_t machine_id, this_id; |
663996b3 MS |
1300 | _cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL; |
1301 | char *id; | |
1302 | int r; | |
1303 | ||
663996b3 MS |
1304 | p = strappend(directory, "/etc/machine-id"); |
1305 | if (!p) | |
1306 | return log_oom(); | |
1307 | ||
1308 | r = read_one_line_file(p, &b); | |
1309 | if (r == -ENOENT && arg_link_journal == LINK_AUTO) | |
1310 | return 0; | |
1311 | else if (r < 0) { | |
1312 | log_error("Failed to read machine ID from %s: %s", p, strerror(-r)); | |
1313 | return r; | |
1314 | } | |
1315 | ||
1316 | id = strstrip(b); | |
1317 | if (isempty(id) && arg_link_journal == LINK_AUTO) | |
1318 | return 0; | |
1319 | ||
1320 | /* Verify validity */ | |
1321 | r = sd_id128_from_string(id, &machine_id); | |
1322 | if (r < 0) { | |
1323 | log_error("Failed to parse machine ID from %s: %s", p, strerror(-r)); | |
1324 | return r; | |
1325 | } | |
1326 | ||
60f067b4 JS |
1327 | r = sd_id128_get_machine(&this_id); |
1328 | if (r < 0) { | |
1329 | log_error("Failed to retrieve machine ID: %s", strerror(-r)); | |
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | if (sd_id128_equal(machine_id, this_id)) { | |
1334 | log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR, | |
1335 | "Host and machine ids are equal (%s): refusing to link journals", id); | |
1336 | if (arg_link_journal == LINK_AUTO) | |
1337 | return 0; | |
1338 | return | |
1339 | -EEXIST; | |
1340 | } | |
1341 | ||
1342 | if (arg_link_journal == LINK_NO) | |
1343 | return 0; | |
1344 | ||
663996b3 MS |
1345 | free(p); |
1346 | p = strappend("/var/log/journal/", id); | |
1347 | q = strjoin(directory, "/var/log/journal/", id, NULL); | |
1348 | if (!p || !q) | |
1349 | return log_oom(); | |
1350 | ||
1351 | if (path_is_mount_point(p, false) > 0) { | |
1352 | if (arg_link_journal != LINK_AUTO) { | |
1353 | log_error("%s: already a mount point, refusing to use for journal", p); | |
1354 | return -EEXIST; | |
1355 | } | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
1360 | if (path_is_mount_point(q, false) > 0) { | |
1361 | if (arg_link_journal != LINK_AUTO) { | |
1362 | log_error("%s: already a mount point, refusing to use for journal", q); | |
1363 | return -EEXIST; | |
1364 | } | |
1365 | ||
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | r = readlink_and_make_absolute(p, &d); | |
1370 | if (r >= 0) { | |
1371 | if ((arg_link_journal == LINK_GUEST || | |
1372 | arg_link_journal == LINK_AUTO) && | |
1373 | path_equal(d, q)) { | |
1374 | ||
1375 | r = mkdir_p(q, 0755); | |
1376 | if (r < 0) | |
5eef597e | 1377 | log_warning("Failed to create directory %s: %m", q); |
663996b3 MS |
1378 | return 0; |
1379 | } | |
1380 | ||
1381 | if (unlink(p) < 0) { | |
1382 | log_error("Failed to remove symlink %s: %m", p); | |
1383 | return -errno; | |
1384 | } | |
1385 | } else if (r == -EINVAL) { | |
1386 | ||
1387 | if (arg_link_journal == LINK_GUEST && | |
1388 | rmdir(p) < 0) { | |
1389 | ||
1390 | if (errno == ENOTDIR) { | |
1391 | log_error("%s already exists and is neither a symlink nor a directory", p); | |
1392 | return r; | |
1393 | } else { | |
1394 | log_error("Failed to remove %s: %m", p); | |
1395 | return -errno; | |
1396 | } | |
1397 | } | |
1398 | } else if (r != -ENOENT) { | |
1399 | log_error("readlink(%s) failed: %m", p); | |
1400 | return r; | |
1401 | } | |
1402 | ||
1403 | if (arg_link_journal == LINK_GUEST) { | |
1404 | ||
1405 | if (symlink(q, p) < 0) { | |
1406 | log_error("Failed to symlink %s to %s: %m", q, p); | |
1407 | return -errno; | |
1408 | } | |
1409 | ||
1410 | r = mkdir_p(q, 0755); | |
1411 | if (r < 0) | |
5eef597e | 1412 | log_warning("Failed to create directory %s: %m", q); |
663996b3 MS |
1413 | return 0; |
1414 | } | |
1415 | ||
1416 | if (arg_link_journal == LINK_HOST) { | |
1417 | r = mkdir_p(p, 0755); | |
1418 | if (r < 0) { | |
1419 | log_error("Failed to create %s: %m", p); | |
1420 | return r; | |
1421 | } | |
1422 | ||
1423 | } else if (access(p, F_OK) < 0) | |
1424 | return 0; | |
1425 | ||
60f067b4 JS |
1426 | if (dir_is_empty(q) == 0) |
1427 | log_warning("%s is not empty, proceeding anyway.", q); | |
663996b3 MS |
1428 | |
1429 | r = mkdir_p(q, 0755); | |
1430 | if (r < 0) { | |
1431 | log_error("Failed to create %s: %m", q); | |
1432 | return r; | |
1433 | } | |
1434 | ||
1435 | if (mount(p, q, "bind", MS_BIND, NULL) < 0) { | |
1436 | log_error("Failed to bind mount journal from host into guest: %m"); | |
1437 | return -errno; | |
1438 | } | |
1439 | ||
1440 | return 0; | |
1441 | } | |
1442 | ||
60f067b4 JS |
1443 | static int setup_kdbus(const char *dest, const char *path) { |
1444 | const char *p; | |
1445 | ||
1446 | if (!path) | |
1447 | return 0; | |
1448 | ||
1449 | p = strappenda(dest, "/dev/kdbus"); | |
1450 | if (mkdir(p, 0755) < 0) { | |
1451 | log_error("Failed to create kdbus path: %m"); | |
1452 | return -errno; | |
1453 | } | |
1454 | ||
1455 | if (mount(path, p, "bind", MS_BIND, NULL) < 0) { | |
1456 | log_error("Failed to mount kdbus domain path: %m"); | |
1457 | return -errno; | |
1458 | } | |
1459 | ||
1460 | return 0; | |
1461 | } | |
1462 | ||
663996b3 MS |
1463 | static int drop_capabilities(void) { |
1464 | return capability_bounding_set_drop(~arg_retain, false); | |
1465 | } | |
1466 | ||
5eef597e | 1467 | static int register_machine(pid_t pid, int local_ifindex) { |
60f067b4 | 1468 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
5eef597e | 1469 | _cleanup_bus_close_unref_ sd_bus *bus = NULL; |
60f067b4 | 1470 | int r; |
663996b3 | 1471 | |
60f067b4 JS |
1472 | if (!arg_register) |
1473 | return 0; | |
663996b3 | 1474 | |
60f067b4 JS |
1475 | r = sd_bus_default_system(&bus); |
1476 | if (r < 0) { | |
1477 | log_error("Failed to open system bus: %s", strerror(-r)); | |
1478 | return r; | |
663996b3 MS |
1479 | } |
1480 | ||
60f067b4 JS |
1481 | if (arg_keep_unit) { |
1482 | r = sd_bus_call_method( | |
1483 | bus, | |
1484 | "org.freedesktop.machine1", | |
1485 | "/org/freedesktop/machine1", | |
1486 | "org.freedesktop.machine1.Manager", | |
5eef597e | 1487 | "RegisterMachineWithNetwork", |
60f067b4 JS |
1488 | &error, |
1489 | NULL, | |
5eef597e | 1490 | "sayssusai", |
60f067b4 JS |
1491 | arg_machine, |
1492 | SD_BUS_MESSAGE_APPEND_ID128(arg_uuid), | |
1493 | "nspawn", | |
1494 | "container", | |
1495 | (uint32_t) pid, | |
5eef597e MP |
1496 | strempty(arg_directory), |
1497 | local_ifindex > 0 ? 1 : 0, local_ifindex); | |
60f067b4 JS |
1498 | } else { |
1499 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
1500 | ||
1501 | r = sd_bus_message_new_method_call( | |
1502 | bus, | |
1503 | &m, | |
1504 | "org.freedesktop.machine1", | |
1505 | "/org/freedesktop/machine1", | |
1506 | "org.freedesktop.machine1.Manager", | |
5eef597e | 1507 | "CreateMachineWithNetwork"); |
60f067b4 JS |
1508 | if (r < 0) { |
1509 | log_error("Failed to create message: %s", strerror(-r)); | |
1510 | return r; | |
1511 | } | |
663996b3 | 1512 | |
60f067b4 JS |
1513 | r = sd_bus_message_append( |
1514 | m, | |
5eef597e | 1515 | "sayssusai", |
60f067b4 JS |
1516 | arg_machine, |
1517 | SD_BUS_MESSAGE_APPEND_ID128(arg_uuid), | |
1518 | "nspawn", | |
1519 | "container", | |
1520 | (uint32_t) pid, | |
5eef597e MP |
1521 | strempty(arg_directory), |
1522 | local_ifindex > 0 ? 1 : 0, local_ifindex); | |
60f067b4 JS |
1523 | if (r < 0) { |
1524 | log_error("Failed to append message arguments: %s", strerror(-r)); | |
1525 | return r; | |
1526 | } | |
663996b3 | 1527 | |
60f067b4 JS |
1528 | r = sd_bus_message_open_container(m, 'a', "(sv)"); |
1529 | if (r < 0) { | |
1530 | log_error("Failed to open container: %s", strerror(-r)); | |
1531 | return r; | |
663996b3 | 1532 | } |
663996b3 | 1533 | |
60f067b4 JS |
1534 | if (!isempty(arg_slice)) { |
1535 | r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice); | |
1536 | if (r < 0) { | |
1537 | log_error("Failed to append slice: %s", strerror(-r)); | |
1538 | return r; | |
1539 | } | |
1540 | } | |
663996b3 | 1541 | |
60f067b4 JS |
1542 | r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict"); |
1543 | if (r < 0) { | |
1544 | log_error("Failed to add device policy: %s", strerror(-r)); | |
1545 | return r; | |
1546 | } | |
663996b3 | 1547 | |
5eef597e | 1548 | r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 11, |
60f067b4 JS |
1549 | /* Allow the container to |
1550 | * access and create the API | |
1551 | * device nodes, so that | |
1552 | * PrivateDevices= in the | |
1553 | * container can work | |
1554 | * fine */ | |
1555 | "/dev/null", "rwm", | |
1556 | "/dev/zero", "rwm", | |
1557 | "/dev/full", "rwm", | |
1558 | "/dev/random", "rwm", | |
1559 | "/dev/urandom", "rwm", | |
1560 | "/dev/tty", "rwm", | |
5eef597e | 1561 | "/dev/net/tun", "rwm", |
60f067b4 JS |
1562 | /* Allow the container |
1563 | * access to ptys. However, | |
1564 | * do not permit the | |
1565 | * container to ever create | |
1566 | * these device nodes. */ | |
1567 | "/dev/pts/ptmx", "rw", | |
1568 | "char-pts", "rw", | |
1569 | /* Allow the container | |
1570 | * access to all kdbus | |
1571 | * devices. Again, the | |
1572 | * container cannot create | |
1573 | * these nodes, only use | |
1574 | * them. We use a pretty | |
1575 | * open match here, so that | |
1576 | * the kernel API can still | |
1577 | * change. */ | |
1578 | "char-kdbus", "rw", | |
1579 | "char-kdbus/*", "rw"); | |
1580 | if (r < 0) { | |
1581 | log_error("Failed to add device whitelist: %s", strerror(-r)); | |
1582 | return r; | |
1583 | } | |
663996b3 | 1584 | |
60f067b4 JS |
1585 | r = sd_bus_message_close_container(m); |
1586 | if (r < 0) { | |
1587 | log_error("Failed to close container: %s", strerror(-r)); | |
1588 | return r; | |
663996b3 | 1589 | } |
60f067b4 JS |
1590 | |
1591 | r = sd_bus_call(bus, m, 0, &error, NULL); | |
663996b3 MS |
1592 | } |
1593 | ||
60f067b4 JS |
1594 | if (r < 0) { |
1595 | log_error("Failed to register machine: %s", bus_error_message(&error, r)); | |
1596 | return r; | |
663996b3 MS |
1597 | } |
1598 | ||
60f067b4 JS |
1599 | return 0; |
1600 | } | |
663996b3 | 1601 | |
60f067b4 JS |
1602 | static int terminate_machine(pid_t pid) { |
1603 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1604 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
5eef597e | 1605 | _cleanup_bus_close_unref_ sd_bus *bus = NULL; |
60f067b4 JS |
1606 | const char *path; |
1607 | int r; | |
663996b3 | 1608 | |
60f067b4 JS |
1609 | if (!arg_register) |
1610 | return 0; | |
663996b3 | 1611 | |
60f067b4 JS |
1612 | r = sd_bus_default_system(&bus); |
1613 | if (r < 0) { | |
1614 | log_error("Failed to open system bus: %s", strerror(-r)); | |
1615 | return r; | |
1616 | } | |
1617 | ||
1618 | r = sd_bus_call_method( | |
1619 | bus, | |
1620 | "org.freedesktop.machine1", | |
1621 | "/org/freedesktop/machine1", | |
1622 | "org.freedesktop.machine1.Manager", | |
1623 | "GetMachineByPID", | |
1624 | &error, | |
1625 | &reply, | |
1626 | "u", | |
1627 | (uint32_t) pid); | |
1628 | if (r < 0) { | |
1629 | /* Note that the machine might already have been | |
1630 | * cleaned up automatically, hence don't consider it a | |
1631 | * failure if we cannot get the machine object. */ | |
1632 | log_debug("Failed to get machine: %s", bus_error_message(&error, r)); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | r = sd_bus_message_read(reply, "o", &path); | |
1637 | if (r < 0) | |
1638 | return bus_log_parse_error(r); | |
1639 | ||
1640 | r = sd_bus_call_method( | |
1641 | bus, | |
1642 | "org.freedesktop.machine1", | |
1643 | path, | |
1644 | "org.freedesktop.machine1.Machine", | |
1645 | "Terminate", | |
1646 | &error, | |
1647 | NULL, | |
1648 | NULL); | |
1649 | if (r < 0) { | |
1650 | log_debug("Failed to terminate machine: %s", bus_error_message(&error, r)); | |
1651 | return 0; | |
1652 | } | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static int reset_audit_loginuid(void) { | |
1658 | _cleanup_free_ char *p = NULL; | |
1659 | int r; | |
1660 | ||
1661 | if (arg_share_system) | |
1662 | return 0; | |
1663 | ||
1664 | r = read_one_line_file("/proc/self/loginuid", &p); | |
1665 | if (r == -ENOENT) | |
1666 | return 0; | |
1667 | if (r < 0) { | |
1668 | log_error("Failed to read /proc/self/loginuid: %s", strerror(-r)); | |
1669 | return r; | |
1670 | } | |
1671 | ||
1672 | /* Already reset? */ | |
1673 | if (streq(p, "4294967295")) | |
1674 | return 0; | |
1675 | ||
1676 | r = write_string_file("/proc/self/loginuid", "4294967295"); | |
1677 | if (r < 0) { | |
1678 | log_error("Failed to reset audit login UID. This probably means that your kernel is too\n" | |
1679 | "old and you have audit enabled. Note that the auditing subsystem is known to\n" | |
1680 | "be incompatible with containers on old kernels. Please make sure to upgrade\n" | |
1681 | "your kernel or to off auditing with 'audit=0' on the kernel command line before\n" | |
1682 | "using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r)); | |
1683 | ||
1684 | sleep(5); | |
1685 | } | |
1686 | ||
1687 | return 0; | |
1688 | } | |
1689 | ||
5eef597e MP |
1690 | #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1) |
1691 | #define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2) | |
60f067b4 | 1692 | |
5eef597e | 1693 | static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key) { |
60f067b4 JS |
1694 | int r; |
1695 | ||
1696 | uint8_t result[8]; | |
1697 | size_t l, sz; | |
1698 | uint8_t *v; | |
1699 | ||
1700 | l = strlen(arg_machine); | |
1701 | sz = sizeof(sd_id128_t) + l; | |
1702 | v = alloca(sz); | |
1703 | ||
1704 | /* fetch some persistent data unique to the host */ | |
1705 | r = sd_id128_get_machine((sd_id128_t*) v); | |
1706 | if (r < 0) | |
1707 | return r; | |
1708 | ||
1709 | /* combine with some data unique (on this host) to this | |
1710 | * container instance */ | |
1711 | memcpy(v + sizeof(sd_id128_t), arg_machine, l); | |
1712 | ||
1713 | /* Let's hash the host machine ID plus the container name. We | |
1714 | * use a fixed, but originally randomly created hash key here. */ | |
5eef597e | 1715 | siphash24(result, v, sz, hash_key.bytes); |
60f067b4 JS |
1716 | |
1717 | assert_cc(ETH_ALEN <= sizeof(result)); | |
1718 | memcpy(mac->ether_addr_octet, result, ETH_ALEN); | |
1719 | ||
1720 | /* see eth_random_addr in the kernel */ | |
1721 | mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */ | |
1722 | mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */ | |
1723 | ||
1724 | return 0; | |
1725 | } | |
1726 | ||
5eef597e | 1727 | static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) { |
60f067b4 JS |
1728 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
1729 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; | |
5eef597e MP |
1730 | struct ether_addr mac_host, mac_container; |
1731 | int r, i; | |
60f067b4 JS |
1732 | |
1733 | if (!arg_private_network) | |
1734 | return 0; | |
1735 | ||
1736 | if (!arg_network_veth) | |
1737 | return 0; | |
1738 | ||
1739 | /* Use two different interface name prefixes depending whether | |
1740 | * we are in bridge mode or not. */ | |
5eef597e MP |
1741 | snprintf(iface_name, IFNAMSIZ - 1, "%s-%s", |
1742 | arg_network_bridge ? "vb" : "ve", arg_machine); | |
1743 | ||
1744 | r = generate_mac(&mac_container, CONTAINER_HASH_KEY); | |
1745 | if (r < 0) { | |
1746 | log_error("Failed to generate predictable MAC address for container side"); | |
1747 | return r; | |
1748 | } | |
60f067b4 | 1749 | |
5eef597e | 1750 | r = generate_mac(&mac_host, HOST_HASH_KEY); |
60f067b4 | 1751 | if (r < 0) { |
5eef597e | 1752 | log_error("Failed to generate predictable MAC address for host side"); |
60f067b4 JS |
1753 | return r; |
1754 | } | |
1755 | ||
1756 | r = sd_rtnl_open(&rtnl, 0); | |
1757 | if (r < 0) { | |
1758 | log_error("Failed to connect to netlink: %s", strerror(-r)); | |
1759 | return r; | |
1760 | } | |
1761 | ||
1762 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
1763 | if (r < 0) { | |
1764 | log_error("Failed to allocate netlink message: %s", strerror(-r)); | |
1765 | return r; | |
1766 | } | |
1767 | ||
1768 | r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name); | |
1769 | if (r < 0) { | |
1770 | log_error("Failed to add netlink interface name: %s", strerror(-r)); | |
1771 | return r; | |
1772 | } | |
1773 | ||
5eef597e MP |
1774 | r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host); |
1775 | if (r < 0) { | |
1776 | log_error("Failed to add netlink MAC address: %s", strerror(-r)); | |
1777 | return r; | |
1778 | } | |
1779 | ||
60f067b4 JS |
1780 | r = sd_rtnl_message_open_container(m, IFLA_LINKINFO); |
1781 | if (r < 0) { | |
1782 | log_error("Failed to open netlink container: %s", strerror(-r)); | |
1783 | return r; | |
1784 | } | |
1785 | ||
1786 | r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth"); | |
1787 | if (r < 0) { | |
1788 | log_error("Failed to open netlink container: %s", strerror(-r)); | |
1789 | return r; | |
1790 | } | |
1791 | ||
1792 | r = sd_rtnl_message_open_container(m, VETH_INFO_PEER); | |
1793 | if (r < 0) { | |
1794 | log_error("Failed to open netlink container: %s", strerror(-r)); | |
1795 | return r; | |
1796 | } | |
1797 | ||
1798 | r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0"); | |
1799 | if (r < 0) { | |
1800 | log_error("Failed to add netlink interface name: %s", strerror(-r)); | |
1801 | return r; | |
1802 | } | |
1803 | ||
5eef597e | 1804 | r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container); |
60f067b4 JS |
1805 | if (r < 0) { |
1806 | log_error("Failed to add netlink MAC address: %s", strerror(-r)); | |
1807 | return r; | |
1808 | } | |
1809 | ||
1810 | r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
1811 | if (r < 0) { | |
1812 | log_error("Failed to add netlink namespace field: %s", strerror(-r)); | |
1813 | return r; | |
1814 | } | |
1815 | ||
1816 | r = sd_rtnl_message_close_container(m); | |
1817 | if (r < 0) { | |
1818 | log_error("Failed to close netlink container: %s", strerror(-r)); | |
1819 | return r; | |
1820 | } | |
1821 | ||
1822 | r = sd_rtnl_message_close_container(m); | |
1823 | if (r < 0) { | |
1824 | log_error("Failed to close netlink container: %s", strerror(-r)); | |
1825 | return r; | |
1826 | } | |
1827 | ||
1828 | r = sd_rtnl_message_close_container(m); | |
1829 | if (r < 0) { | |
1830 | log_error("Failed to close netlink container: %s", strerror(-r)); | |
1831 | return r; | |
1832 | } | |
1833 | ||
1834 | r = sd_rtnl_call(rtnl, m, 0, NULL); | |
1835 | if (r < 0) { | |
1836 | log_error("Failed to add new veth interfaces: %s", strerror(-r)); | |
1837 | return r; | |
1838 | } | |
1839 | ||
5eef597e MP |
1840 | i = (int) if_nametoindex(iface_name); |
1841 | if (i <= 0) { | |
1842 | log_error("Failed to resolve interface %s: %m", iface_name); | |
1843 | return -errno; | |
1844 | } | |
1845 | ||
1846 | *ifi = i; | |
1847 | ||
60f067b4 JS |
1848 | return 0; |
1849 | } | |
1850 | ||
5eef597e | 1851 | static int setup_bridge(const char veth_name[], int *ifi) { |
60f067b4 JS |
1852 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; |
1853 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; | |
1854 | int r, bridge; | |
1855 | ||
1856 | if (!arg_private_network) | |
1857 | return 0; | |
1858 | ||
1859 | if (!arg_network_veth) | |
1860 | return 0; | |
1861 | ||
1862 | if (!arg_network_bridge) | |
1863 | return 0; | |
1864 | ||
1865 | bridge = (int) if_nametoindex(arg_network_bridge); | |
1866 | if (bridge <= 0) { | |
1867 | log_error("Failed to resolve interface %s: %m", arg_network_bridge); | |
1868 | return -errno; | |
1869 | } | |
1870 | ||
5eef597e MP |
1871 | *ifi = bridge; |
1872 | ||
60f067b4 JS |
1873 | r = sd_rtnl_open(&rtnl, 0); |
1874 | if (r < 0) { | |
1875 | log_error("Failed to connect to netlink: %s", strerror(-r)); | |
1876 | return r; | |
1877 | } | |
1878 | ||
1879 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); | |
1880 | if (r < 0) { | |
1881 | log_error("Failed to allocate netlink message: %s", strerror(-r)); | |
1882 | return r; | |
1883 | } | |
1884 | ||
1885 | r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); | |
1886 | if (r < 0) { | |
1887 | log_error("Failed to set IFF_UP flag: %s", strerror(-r)); | |
1888 | return r; | |
1889 | } | |
1890 | ||
1891 | r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name); | |
1892 | if (r < 0) { | |
1893 | log_error("Failed to add netlink interface name field: %s", strerror(-r)); | |
1894 | return r; | |
1895 | } | |
1896 | ||
1897 | r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge); | |
1898 | if (r < 0) { | |
1899 | log_error("Failed to add netlink master field: %s", strerror(-r)); | |
1900 | return r; | |
1901 | } | |
1902 | ||
1903 | r = sd_rtnl_call(rtnl, m, 0, NULL); | |
1904 | if (r < 0) { | |
1905 | log_error("Failed to add veth interface to bridge: %s", strerror(-r)); | |
1906 | return r; | |
1907 | } | |
1908 | ||
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | static int parse_interface(struct udev *udev, const char *name) { | |
1913 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1914 | char ifi_str[2 + DECIMAL_STR_MAX(int)]; | |
1915 | int ifi; | |
1916 | ||
1917 | ifi = (int) if_nametoindex(name); | |
1918 | if (ifi <= 0) { | |
1919 | log_error("Failed to resolve interface %s: %m", name); | |
1920 | return -errno; | |
1921 | } | |
1922 | ||
1923 | sprintf(ifi_str, "n%i", ifi); | |
1924 | d = udev_device_new_from_device_id(udev, ifi_str); | |
1925 | if (!d) { | |
1926 | log_error("Failed to get udev device for interface %s: %m", name); | |
1927 | return -errno; | |
1928 | } | |
1929 | ||
1930 | if (udev_device_get_is_initialized(d) <= 0) { | |
1931 | log_error("Network interface %s is not initialized yet.", name); | |
1932 | return -EBUSY; | |
1933 | } | |
1934 | ||
1935 | return ifi; | |
1936 | } | |
1937 | ||
1938 | static int move_network_interfaces(pid_t pid) { | |
1939 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
1940 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; | |
1941 | char **i; | |
1942 | int r; | |
1943 | ||
1944 | if (!arg_private_network) | |
1945 | return 0; | |
1946 | ||
1947 | if (strv_isempty(arg_network_interfaces)) | |
1948 | return 0; | |
1949 | ||
1950 | r = sd_rtnl_open(&rtnl, 0); | |
1951 | if (r < 0) { | |
1952 | log_error("Failed to connect to netlink: %s", strerror(-r)); | |
1953 | return r; | |
1954 | } | |
1955 | ||
1956 | udev = udev_new(); | |
1957 | if (!udev) { | |
1958 | log_error("Failed to connect to udev."); | |
1959 | return -ENOMEM; | |
1960 | } | |
1961 | ||
1962 | STRV_FOREACH(i, arg_network_interfaces) { | |
1963 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; | |
1964 | int ifi; | |
1965 | ||
1966 | ifi = parse_interface(udev, *i); | |
1967 | if (ifi < 0) | |
1968 | return ifi; | |
1969 | ||
5eef597e | 1970 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi); |
60f067b4 JS |
1971 | if (r < 0) { |
1972 | log_error("Failed to allocate netlink message: %s", strerror(-r)); | |
1973 | return r; | |
1974 | } | |
1975 | ||
1976 | r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
1977 | if (r < 0) { | |
1978 | log_error("Failed to append namespace PID to netlink message: %s", strerror(-r)); | |
1979 | return r; | |
1980 | } | |
1981 | ||
1982 | r = sd_rtnl_call(rtnl, m, 0, NULL); | |
1983 | if (r < 0) { | |
1984 | log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r)); | |
1985 | return r; | |
1986 | } | |
1987 | } | |
1988 | ||
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | static int setup_macvlan(pid_t pid) { | |
1993 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
1994 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; | |
1995 | char **i; | |
1996 | int r; | |
1997 | ||
1998 | if (!arg_private_network) | |
1999 | return 0; | |
2000 | ||
2001 | if (strv_isempty(arg_network_macvlan)) | |
2002 | return 0; | |
2003 | ||
2004 | r = sd_rtnl_open(&rtnl, 0); | |
2005 | if (r < 0) { | |
2006 | log_error("Failed to connect to netlink: %s", strerror(-r)); | |
2007 | return r; | |
2008 | } | |
2009 | ||
2010 | udev = udev_new(); | |
2011 | if (!udev) { | |
2012 | log_error("Failed to connect to udev."); | |
2013 | return -ENOMEM; | |
2014 | } | |
2015 | ||
2016 | STRV_FOREACH(i, arg_network_macvlan) { | |
2017 | _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL; | |
2018 | _cleanup_free_ char *n = NULL; | |
2019 | int ifi; | |
2020 | ||
2021 | ifi = parse_interface(udev, *i); | |
2022 | if (ifi < 0) | |
2023 | return ifi; | |
2024 | ||
2025 | r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); | |
2026 | if (r < 0) { | |
2027 | log_error("Failed to allocate netlink message: %s", strerror(-r)); | |
2028 | return r; | |
2029 | } | |
2030 | ||
2031 | r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi); | |
2032 | if (r < 0) { | |
2033 | log_error("Failed to add netlink interface index: %s", strerror(-r)); | |
2034 | return r; | |
2035 | } | |
2036 | ||
2037 | n = strappend("mv-", *i); | |
2038 | if (!n) | |
2039 | return log_oom(); | |
2040 | ||
2041 | strshorten(n, IFNAMSIZ-1); | |
2042 | ||
2043 | r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n); | |
2044 | if (r < 0) { | |
2045 | log_error("Failed to add netlink interface name: %s", strerror(-r)); | |
2046 | return r; | |
2047 | } | |
2048 | ||
2049 | r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid); | |
2050 | if (r < 0) { | |
2051 | log_error("Failed to add netlink namespace field: %s", strerror(-r)); | |
2052 | return r; | |
2053 | } | |
2054 | ||
2055 | r = sd_rtnl_message_open_container(m, IFLA_LINKINFO); | |
2056 | if (r < 0) { | |
2057 | log_error("Failed to open netlink container: %s", strerror(-r)); | |
2058 | return r; | |
2059 | } | |
2060 | ||
2061 | r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan"); | |
2062 | if (r < 0) { | |
2063 | log_error("Failed to open netlink container: %s", strerror(-r)); | |
2064 | return r; | |
2065 | } | |
2066 | ||
2067 | r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE); | |
2068 | if (r < 0) { | |
2069 | log_error("Failed to append macvlan mode: %s", strerror(-r)); | |
2070 | return r; | |
2071 | } | |
2072 | ||
2073 | r = sd_rtnl_message_close_container(m); | |
2074 | if (r < 0) { | |
2075 | log_error("Failed to close netlink container: %s", strerror(-r)); | |
2076 | return r; | |
2077 | } | |
2078 | ||
2079 | r = sd_rtnl_message_close_container(m); | |
2080 | if (r < 0) { | |
2081 | log_error("Failed to close netlink container: %s", strerror(-r)); | |
2082 | return r; | |
2083 | } | |
2084 | ||
2085 | r = sd_rtnl_call(rtnl, m, 0, NULL); | |
2086 | if (r < 0) { | |
2087 | log_error("Failed to add new macvlan interfaces: %s", strerror(-r)); | |
2088 | return r; | |
2089 | } | |
2090 | } | |
2091 | ||
2092 | return 0; | |
2093 | } | |
2094 | ||
e842803a | 2095 | static int setup_seccomp(void) { |
60f067b4 JS |
2096 | |
2097 | #ifdef HAVE_SECCOMP | |
e842803a MB |
2098 | static const int blacklist[] = { |
2099 | SCMP_SYS(kexec_load), | |
2100 | SCMP_SYS(open_by_handle_at), | |
2101 | SCMP_SYS(init_module), | |
2102 | SCMP_SYS(finit_module), | |
2103 | SCMP_SYS(delete_module), | |
2104 | SCMP_SYS(iopl), | |
2105 | SCMP_SYS(ioperm), | |
2106 | SCMP_SYS(swapon), | |
2107 | SCMP_SYS(swapoff), | |
2108 | }; | |
2109 | ||
60f067b4 | 2110 | scmp_filter_ctx seccomp; |
e842803a | 2111 | unsigned i; |
60f067b4 JS |
2112 | int r; |
2113 | ||
60f067b4 JS |
2114 | seccomp = seccomp_init(SCMP_ACT_ALLOW); |
2115 | if (!seccomp) | |
2116 | return log_oom(); | |
2117 | ||
2118 | r = seccomp_add_secondary_archs(seccomp); | |
2119 | if (r < 0) { | |
2120 | log_error("Failed to add secondary archs to seccomp filter: %s", strerror(-r)); | |
2121 | goto finish; | |
2122 | } | |
2123 | ||
e842803a MB |
2124 | for (i = 0; i < ELEMENTSOF(blacklist); i++) { |
2125 | r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i], 0); | |
2126 | if (r == -EFAULT) | |
2127 | continue; /* unknown syscall */ | |
2128 | if (r < 0) { | |
2129 | log_error("Failed to block syscall: %s", strerror(-r)); | |
2130 | goto finish; | |
2131 | } | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | Audit is broken in containers, much of the userspace audit | |
2136 | hookup will fail if running inside a container. We don't | |
2137 | care and just turn off creation of audit sockets. | |
2138 | ||
2139 | This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail | |
2140 | with EAFNOSUPPORT which audit userspace uses as indication | |
2141 | that audit is disabled in the kernel. | |
2142 | */ | |
2143 | ||
60f067b4 JS |
2144 | r = seccomp_rule_add( |
2145 | seccomp, | |
2146 | SCMP_ACT_ERRNO(EAFNOSUPPORT), | |
2147 | SCMP_SYS(socket), | |
2148 | 2, | |
2149 | SCMP_A0(SCMP_CMP_EQ, AF_NETLINK), | |
2150 | SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT)); | |
2151 | if (r < 0) { | |
2152 | log_error("Failed to add audit seccomp rule: %s", strerror(-r)); | |
2153 | goto finish; | |
2154 | } | |
2155 | ||
2156 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
2157 | if (r < 0) { | |
2158 | log_error("Failed to unset NO_NEW_PRIVS: %s", strerror(-r)); | |
2159 | goto finish; | |
2160 | } | |
2161 | ||
2162 | r = seccomp_load(seccomp); | |
2163 | if (r < 0) | |
2164 | log_error("Failed to install seccomp audit filter: %s", strerror(-r)); | |
2165 | ||
2166 | finish: | |
2167 | seccomp_release(seccomp); | |
2168 | return r; | |
2169 | #else | |
2170 | return 0; | |
2171 | #endif | |
2172 | ||
2173 | } | |
2174 | ||
2175 | static int setup_image(char **device_path, int *loop_nr) { | |
2176 | struct loop_info64 info = { | |
2177 | .lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN | |
2178 | }; | |
2179 | _cleanup_close_ int fd = -1, control = -1, loop = -1; | |
2180 | _cleanup_free_ char* loopdev = NULL; | |
2181 | struct stat st; | |
2182 | int r, nr; | |
2183 | ||
2184 | assert(device_path); | |
2185 | assert(loop_nr); | |
2186 | ||
2187 | fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY); | |
2188 | if (fd < 0) { | |
2189 | log_error("Failed to open %s: %m", arg_image); | |
2190 | return -errno; | |
2191 | } | |
2192 | ||
2193 | if (fstat(fd, &st) < 0) { | |
2194 | log_error("Failed to stat %s: %m", arg_image); | |
2195 | return -errno; | |
2196 | } | |
2197 | ||
2198 | if (S_ISBLK(st.st_mode)) { | |
2199 | char *p; | |
2200 | ||
2201 | p = strdup(arg_image); | |
2202 | if (!p) | |
2203 | return log_oom(); | |
2204 | ||
2205 | *device_path = p; | |
2206 | ||
2207 | *loop_nr = -1; | |
2208 | ||
2209 | r = fd; | |
2210 | fd = -1; | |
2211 | ||
2212 | return r; | |
2213 | } | |
2214 | ||
2215 | if (!S_ISREG(st.st_mode)) { | |
2216 | log_error("%s is not a regular file or block device: %m", arg_image); | |
2217 | return -EINVAL; | |
2218 | } | |
2219 | ||
2220 | control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); | |
2221 | if (control < 0) { | |
2222 | log_error("Failed to open /dev/loop-control: %m"); | |
2223 | return -errno; | |
2224 | } | |
2225 | ||
2226 | nr = ioctl(control, LOOP_CTL_GET_FREE); | |
2227 | if (nr < 0) { | |
2228 | log_error("Failed to allocate loop device: %m"); | |
2229 | return -errno; | |
2230 | } | |
2231 | ||
2232 | if (asprintf(&loopdev, "/dev/loop%i", nr) < 0) | |
2233 | return log_oom(); | |
2234 | ||
2235 | loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY); | |
2236 | if (loop < 0) { | |
2237 | log_error("Failed to open loop device %s: %m", loopdev); | |
2238 | return -errno; | |
2239 | } | |
2240 | ||
2241 | if (ioctl(loop, LOOP_SET_FD, fd) < 0) { | |
2242 | log_error("Failed to set loopback file descriptor on %s: %m", loopdev); | |
2243 | return -errno; | |
2244 | } | |
2245 | ||
2246 | if (arg_read_only) | |
2247 | info.lo_flags |= LO_FLAGS_READ_ONLY; | |
2248 | ||
2249 | if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) { | |
2250 | log_error("Failed to set loopback settings on %s: %m", loopdev); | |
2251 | return -errno; | |
2252 | } | |
2253 | ||
2254 | *device_path = loopdev; | |
2255 | loopdev = NULL; | |
2256 | ||
2257 | *loop_nr = nr; | |
2258 | ||
2259 | r = loop; | |
2260 | loop = -1; | |
2261 | ||
2262 | return r; | |
2263 | } | |
2264 | ||
2265 | static int dissect_image( | |
2266 | int fd, | |
2267 | char **root_device, bool *root_device_rw, | |
2268 | char **home_device, bool *home_device_rw, | |
2269 | char **srv_device, bool *srv_device_rw, | |
2270 | bool *secondary) { | |
2271 | ||
2272 | #ifdef HAVE_BLKID | |
2273 | int home_nr = -1, root_nr = -1, secondary_root_nr = -1, srv_nr = -1; | |
2274 | _cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL; | |
2275 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
2276 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
2277 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
2278 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
2279 | struct udev_list_entry *first, *item; | |
2280 | bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true; | |
2281 | const char *pttype = NULL; | |
2282 | blkid_partlist pl; | |
2283 | struct stat st; | |
2284 | int r; | |
2285 | ||
2286 | assert(fd >= 0); | |
2287 | assert(root_device); | |
2288 | assert(home_device); | |
2289 | assert(srv_device); | |
2290 | assert(secondary); | |
2291 | ||
2292 | b = blkid_new_probe(); | |
2293 | if (!b) | |
2294 | return log_oom(); | |
2295 | ||
2296 | errno = 0; | |
2297 | r = blkid_probe_set_device(b, fd, 0, 0); | |
2298 | if (r != 0) { | |
2299 | if (errno == 0) | |
2300 | return log_oom(); | |
2301 | ||
2302 | log_error("Failed to set device on blkid probe: %m"); | |
2303 | return -errno; | |
2304 | } | |
2305 | ||
2306 | blkid_probe_enable_partitions(b, 1); | |
2307 | blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); | |
2308 | ||
2309 | errno = 0; | |
2310 | r = blkid_do_safeprobe(b); | |
2311 | if (r == -2 || r == 1) { | |
2312 | log_error("Failed to identify any partition table on %s.\n" | |
2313 | "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image); | |
2314 | return -EINVAL; | |
2315 | } else if (r != 0) { | |
2316 | if (errno == 0) | |
2317 | errno = EIO; | |
2318 | log_error("Failed to probe: %m"); | |
2319 | return -errno; | |
2320 | } | |
2321 | ||
2322 | blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); | |
2323 | if (!streq_ptr(pttype, "gpt")) { | |
2324 | log_error("Image %s does not carry a GUID Partition Table.\n" | |
2325 | "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image); | |
2326 | return -EINVAL; | |
2327 | } | |
2328 | ||
2329 | errno = 0; | |
2330 | pl = blkid_probe_get_partitions(b); | |
2331 | if (!pl) { | |
2332 | if (errno == 0) | |
2333 | return log_oom(); | |
2334 | ||
2335 | log_error("Failed to list partitions of %s", arg_image); | |
2336 | return -errno; | |
2337 | } | |
2338 | ||
2339 | udev = udev_new(); | |
2340 | if (!udev) | |
2341 | return log_oom(); | |
2342 | ||
2343 | if (fstat(fd, &st) < 0) { | |
2344 | log_error("Failed to stat block device: %m"); | |
2345 | return -errno; | |
2346 | } | |
2347 | ||
2348 | d = udev_device_new_from_devnum(udev, 'b', st.st_rdev); | |
2349 | if (!d) | |
2350 | return log_oom(); | |
2351 | ||
2352 | e = udev_enumerate_new(udev); | |
2353 | if (!e) | |
2354 | return log_oom(); | |
2355 | ||
2356 | r = udev_enumerate_add_match_parent(e, d); | |
2357 | if (r < 0) | |
2358 | return log_oom(); | |
2359 | ||
2360 | r = udev_enumerate_scan_devices(e); | |
2361 | if (r < 0) { | |
2362 | log_error("Failed to scan for partition devices of %s: %s", arg_image, strerror(-r)); | |
2363 | return r; | |
2364 | } | |
2365 | ||
2366 | first = udev_enumerate_get_list_entry(e); | |
2367 | udev_list_entry_foreach(item, first) { | |
2368 | _cleanup_udev_device_unref_ struct udev_device *q; | |
2369 | const char *stype, *node; | |
2370 | unsigned long long flags; | |
2371 | sd_id128_t type_id; | |
2372 | blkid_partition pp; | |
2373 | dev_t qn; | |
2374 | int nr; | |
2375 | ||
2376 | errno = 0; | |
2377 | q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
2378 | if (!q) { | |
2379 | if (!errno) | |
2380 | errno = ENOMEM; | |
2381 | ||
2382 | log_error("Failed to get partition device of %s: %m", arg_image); | |
2383 | return -errno; | |
663996b3 MS |
2384 | } |
2385 | ||
60f067b4 JS |
2386 | qn = udev_device_get_devnum(q); |
2387 | if (major(qn) == 0) | |
2388 | continue; | |
663996b3 | 2389 | |
60f067b4 JS |
2390 | if (st.st_rdev == qn) |
2391 | continue; | |
663996b3 | 2392 | |
60f067b4 JS |
2393 | node = udev_device_get_devnode(q); |
2394 | if (!node) | |
2395 | continue; | |
663996b3 | 2396 | |
60f067b4 JS |
2397 | pp = blkid_partlist_devno_to_partition(pl, qn); |
2398 | if (!pp) | |
2399 | continue; | |
663996b3 | 2400 | |
60f067b4 JS |
2401 | flags = blkid_partition_get_flags(pp); |
2402 | if (flags & GPT_FLAG_NO_AUTO) | |
2403 | continue; | |
663996b3 | 2404 | |
60f067b4 JS |
2405 | nr = blkid_partition_get_partno(pp); |
2406 | if (nr < 0) | |
2407 | continue; | |
663996b3 | 2408 | |
60f067b4 JS |
2409 | stype = blkid_partition_get_type_string(pp); |
2410 | if (!stype) | |
2411 | continue; | |
663996b3 | 2412 | |
60f067b4 JS |
2413 | if (sd_id128_from_string(stype, &type_id) < 0) |
2414 | continue; | |
663996b3 | 2415 | |
60f067b4 | 2416 | if (sd_id128_equal(type_id, GPT_HOME)) { |
663996b3 | 2417 | |
60f067b4 JS |
2418 | if (home && nr >= home_nr) |
2419 | continue; | |
663996b3 | 2420 | |
60f067b4 JS |
2421 | home_nr = nr; |
2422 | home_rw = !(flags & GPT_FLAG_READ_ONLY); | |
663996b3 | 2423 | |
60f067b4 JS |
2424 | free(home); |
2425 | home = strdup(node); | |
2426 | if (!home) | |
2427 | return log_oom(); | |
2428 | } else if (sd_id128_equal(type_id, GPT_SRV)) { | |
2429 | ||
2430 | if (srv && nr >= srv_nr) | |
2431 | continue; | |
2432 | ||
2433 | srv_nr = nr; | |
2434 | srv_rw = !(flags & GPT_FLAG_READ_ONLY); | |
2435 | ||
2436 | free(srv); | |
2437 | srv = strdup(node); | |
2438 | if (!srv) | |
2439 | return log_oom(); | |
2440 | } | |
2441 | #ifdef GPT_ROOT_NATIVE | |
2442 | else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { | |
2443 | ||
2444 | if (root && nr >= root_nr) | |
2445 | continue; | |
2446 | ||
2447 | root_nr = nr; | |
2448 | root_rw = !(flags & GPT_FLAG_READ_ONLY); | |
2449 | ||
2450 | free(root); | |
2451 | root = strdup(node); | |
2452 | if (!root) | |
2453 | return log_oom(); | |
2454 | } | |
2455 | #endif | |
2456 | #ifdef GPT_ROOT_SECONDARY | |
2457 | else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { | |
2458 | ||
2459 | if (secondary_root && nr >= secondary_root_nr) | |
2460 | continue; | |
2461 | ||
2462 | secondary_root_nr = nr; | |
2463 | secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY); | |
2464 | ||
2465 | ||
2466 | free(secondary_root); | |
2467 | secondary_root = strdup(node); | |
2468 | if (!secondary_root) | |
2469 | return log_oom(); | |
2470 | } | |
2471 | #endif | |
2472 | } | |
2473 | ||
2474 | if (!root && !secondary_root) { | |
2475 | log_error("Failed to identify root partition in disk image %s.\n" | |
2476 | "Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image); | |
2477 | return -EINVAL; | |
2478 | } | |
2479 | ||
2480 | if (root) { | |
2481 | *root_device = root; | |
2482 | root = NULL; | |
2483 | ||
2484 | *root_device_rw = root_rw; | |
2485 | *secondary = false; | |
2486 | } else if (secondary_root) { | |
2487 | *root_device = secondary_root; | |
2488 | secondary_root = NULL; | |
2489 | ||
2490 | *root_device_rw = secondary_root_rw; | |
2491 | *secondary = true; | |
2492 | } | |
2493 | ||
2494 | if (home) { | |
2495 | *home_device = home; | |
2496 | home = NULL; | |
2497 | ||
2498 | *home_device_rw = home_rw; | |
2499 | } | |
2500 | ||
2501 | if (srv) { | |
2502 | *srv_device = srv; | |
2503 | srv = NULL; | |
2504 | ||
2505 | *srv_device_rw = srv_rw; | |
2506 | } | |
2507 | ||
2508 | return 0; | |
2509 | #else | |
2510 | log_error("--image= is not supported, compiled without blkid support."); | |
2511 | return -ENOTSUP; | |
2512 | #endif | |
2513 | } | |
2514 | ||
2515 | static int mount_device(const char *what, const char *where, const char *directory, bool rw) { | |
2516 | #ifdef HAVE_BLKID | |
2517 | _cleanup_blkid_free_probe_ blkid_probe b = NULL; | |
2518 | const char *fstype, *p; | |
2519 | int r; | |
2520 | ||
2521 | assert(what); | |
2522 | assert(where); | |
2523 | ||
2524 | if (arg_read_only) | |
2525 | rw = false; | |
2526 | ||
2527 | if (directory) | |
2528 | p = strappenda(where, directory); | |
2529 | else | |
2530 | p = where; | |
2531 | ||
2532 | errno = 0; | |
2533 | b = blkid_new_probe_from_filename(what); | |
2534 | if (!b) { | |
2535 | if (errno == 0) | |
2536 | return log_oom(); | |
2537 | log_error("Failed to allocate prober for %s: %m", what); | |
2538 | return -errno; | |
2539 | } | |
2540 | ||
2541 | blkid_probe_enable_superblocks(b, 1); | |
2542 | blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); | |
2543 | ||
2544 | errno = 0; | |
2545 | r = blkid_do_safeprobe(b); | |
2546 | if (r == -1 || r == 1) { | |
2547 | log_error("Cannot determine file system type of %s", what); | |
2548 | return -EINVAL; | |
2549 | } else if (r != 0) { | |
2550 | if (errno == 0) | |
2551 | errno = EIO; | |
2552 | log_error("Failed to probe %s: %m", what); | |
2553 | return -errno; | |
2554 | } | |
2555 | ||
2556 | errno = 0; | |
2557 | if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) { | |
2558 | if (errno == 0) | |
2559 | errno = EINVAL; | |
2560 | log_error("Failed to determine file system type of %s", what); | |
2561 | return -errno; | |
2562 | } | |
2563 | ||
2564 | if (streq(fstype, "crypto_LUKS")) { | |
2565 | log_error("nspawn currently does not support LUKS disk images."); | |
2566 | return -ENOTSUP; | |
2567 | } | |
2568 | ||
2569 | if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0) { | |
2570 | log_error("Failed to mount %s: %m", what); | |
2571 | return -errno; | |
2572 | } | |
2573 | ||
2574 | return 0; | |
2575 | #else | |
2576 | log_error("--image= is not supported, compiled without blkid support."); | |
2577 | return -ENOTSUP; | |
2578 | #endif | |
2579 | } | |
2580 | ||
2581 | static int mount_devices( | |
2582 | const char *where, | |
2583 | const char *root_device, bool root_device_rw, | |
2584 | const char *home_device, bool home_device_rw, | |
2585 | const char *srv_device, bool srv_device_rw) { | |
2586 | int r; | |
2587 | ||
2588 | assert(where); | |
2589 | ||
2590 | if (root_device) { | |
2591 | r = mount_device(root_device, arg_directory, NULL, root_device_rw); | |
2592 | if (r < 0) { | |
2593 | log_error("Failed to mount root directory: %s", strerror(-r)); | |
2594 | return r; | |
2595 | } | |
2596 | } | |
2597 | ||
2598 | if (home_device) { | |
2599 | r = mount_device(home_device, arg_directory, "/home", home_device_rw); | |
2600 | if (r < 0) { | |
2601 | log_error("Failed to mount home directory: %s", strerror(-r)); | |
2602 | return r; | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | if (srv_device) { | |
2607 | r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw); | |
2608 | if (r < 0) { | |
2609 | log_error("Failed to mount server data directory: %s", strerror(-r)); | |
2610 | return r; | |
2611 | } | |
2612 | } | |
2613 | ||
2614 | return 0; | |
2615 | } | |
2616 | ||
2617 | static void loop_remove(int nr, int *image_fd) { | |
2618 | _cleanup_close_ int control = -1; | |
5eef597e | 2619 | int r; |
60f067b4 JS |
2620 | |
2621 | if (nr < 0) | |
2622 | return; | |
2623 | ||
2624 | if (image_fd && *image_fd >= 0) { | |
5eef597e MP |
2625 | r = ioctl(*image_fd, LOOP_CLR_FD); |
2626 | if (r < 0) | |
2627 | log_warning("Failed to close loop image: %m"); | |
60f067b4 JS |
2628 | *image_fd = safe_close(*image_fd); |
2629 | } | |
2630 | ||
2631 | control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); | |
5eef597e MP |
2632 | if (control < 0) { |
2633 | log_warning("Failed to open /dev/loop-control: %m"); | |
60f067b4 | 2634 | return; |
5eef597e | 2635 | } |
60f067b4 | 2636 | |
5eef597e MP |
2637 | r = ioctl(control, LOOP_CTL_REMOVE, nr); |
2638 | if (r < 0) | |
2639 | log_warning("Failed to remove loop %d: %m", nr); | |
60f067b4 JS |
2640 | } |
2641 | ||
2642 | static int spawn_getent(const char *database, const char *key, pid_t *rpid) { | |
2643 | int pipe_fds[2]; | |
2644 | pid_t pid; | |
2645 | ||
2646 | assert(database); | |
2647 | assert(key); | |
2648 | assert(rpid); | |
2649 | ||
2650 | if (pipe2(pipe_fds, O_CLOEXEC) < 0) { | |
2651 | log_error("Failed to allocate pipe: %m"); | |
2652 | return -errno; | |
2653 | } | |
2654 | ||
2655 | pid = fork(); | |
2656 | if (pid < 0) { | |
2657 | log_error("Failed to fork getent child: %m"); | |
2658 | return -errno; | |
2659 | } else if (pid == 0) { | |
2660 | int nullfd; | |
2661 | char *empty_env = NULL; | |
2662 | ||
2663 | if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0) | |
2664 | _exit(EXIT_FAILURE); | |
2665 | ||
2666 | if (pipe_fds[0] > 2) | |
2667 | safe_close(pipe_fds[0]); | |
2668 | if (pipe_fds[1] > 2) | |
2669 | safe_close(pipe_fds[1]); | |
2670 | ||
2671 | nullfd = open("/dev/null", O_RDWR); | |
2672 | if (nullfd < 0) | |
2673 | _exit(EXIT_FAILURE); | |
2674 | ||
2675 | if (dup3(nullfd, STDIN_FILENO, 0) < 0) | |
2676 | _exit(EXIT_FAILURE); | |
2677 | ||
2678 | if (dup3(nullfd, STDERR_FILENO, 0) < 0) | |
2679 | _exit(EXIT_FAILURE); | |
2680 | ||
2681 | if (nullfd > 2) | |
2682 | safe_close(nullfd); | |
2683 | ||
2684 | reset_all_signal_handlers(); | |
2685 | close_all_fds(NULL, 0); | |
2686 | ||
2687 | execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env); | |
2688 | execle("/bin/getent", "getent", database, key, NULL, &empty_env); | |
2689 | _exit(EXIT_FAILURE); | |
2690 | } | |
2691 | ||
2692 | pipe_fds[1] = safe_close(pipe_fds[1]); | |
2693 | ||
2694 | *rpid = pid; | |
2695 | ||
2696 | return pipe_fds[0]; | |
2697 | } | |
2698 | ||
2699 | static int change_uid_gid(char **_home) { | |
5eef597e MP |
2700 | char line[LINE_MAX], *x, *u, *g, *h; |
2701 | const char *word, *state; | |
60f067b4 JS |
2702 | _cleanup_free_ uid_t *uids = NULL; |
2703 | _cleanup_free_ char *home = NULL; | |
2704 | _cleanup_fclose_ FILE *f = NULL; | |
2705 | _cleanup_close_ int fd = -1; | |
2706 | unsigned n_uids = 0; | |
2707 | size_t sz = 0, l; | |
2708 | uid_t uid; | |
2709 | gid_t gid; | |
2710 | pid_t pid; | |
2711 | int r; | |
2712 | ||
2713 | assert(_home); | |
2714 | ||
2715 | if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) { | |
2716 | /* Reset everything fully to 0, just in case */ | |
2717 | ||
2718 | if (setgroups(0, NULL) < 0) { | |
2719 | log_error("setgroups() failed: %m"); | |
2720 | return -errno; | |
2721 | } | |
2722 | ||
2723 | if (setresgid(0, 0, 0) < 0) { | |
2724 | log_error("setregid() failed: %m"); | |
2725 | return -errno; | |
2726 | } | |
2727 | ||
2728 | if (setresuid(0, 0, 0) < 0) { | |
2729 | log_error("setreuid() failed: %m"); | |
2730 | return -errno; | |
2731 | } | |
2732 | ||
2733 | *_home = NULL; | |
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | /* First, get user credentials */ | |
2738 | fd = spawn_getent("passwd", arg_user, &pid); | |
2739 | if (fd < 0) | |
2740 | return fd; | |
2741 | ||
2742 | f = fdopen(fd, "r"); | |
2743 | if (!f) | |
2744 | return log_oom(); | |
2745 | fd = -1; | |
2746 | ||
2747 | if (!fgets(line, sizeof(line), f)) { | |
2748 | ||
2749 | if (!ferror(f)) { | |
2750 | log_error("Failed to resolve user %s.", arg_user); | |
2751 | return -ESRCH; | |
2752 | } | |
2753 | ||
2754 | log_error("Failed to read from getent: %m"); | |
2755 | return -errno; | |
2756 | } | |
2757 | ||
2758 | truncate_nl(line); | |
2759 | ||
2760 | wait_for_terminate_and_warn("getent passwd", pid); | |
2761 | ||
2762 | x = strchr(line, ':'); | |
2763 | if (!x) { | |
2764 | log_error("/etc/passwd entry has invalid user field."); | |
2765 | return -EIO; | |
2766 | } | |
2767 | ||
2768 | u = strchr(x+1, ':'); | |
2769 | if (!u) { | |
2770 | log_error("/etc/passwd entry has invalid password field."); | |
2771 | return -EIO; | |
2772 | } | |
2773 | ||
2774 | u++; | |
2775 | g = strchr(u, ':'); | |
2776 | if (!g) { | |
2777 | log_error("/etc/passwd entry has invalid UID field."); | |
2778 | return -EIO; | |
2779 | } | |
2780 | ||
2781 | *g = 0; | |
2782 | g++; | |
2783 | x = strchr(g, ':'); | |
2784 | if (!x) { | |
2785 | log_error("/etc/passwd entry has invalid GID field."); | |
2786 | return -EIO; | |
2787 | } | |
2788 | ||
2789 | *x = 0; | |
2790 | h = strchr(x+1, ':'); | |
2791 | if (!h) { | |
2792 | log_error("/etc/passwd entry has invalid GECOS field."); | |
2793 | return -EIO; | |
2794 | } | |
2795 | ||
2796 | h++; | |
2797 | x = strchr(h, ':'); | |
2798 | if (!x) { | |
2799 | log_error("/etc/passwd entry has invalid home directory field."); | |
2800 | return -EIO; | |
2801 | } | |
663996b3 | 2802 | |
60f067b4 | 2803 | *x = 0; |
663996b3 | 2804 | |
60f067b4 JS |
2805 | r = parse_uid(u, &uid); |
2806 | if (r < 0) { | |
2807 | log_error("Failed to parse UID of user."); | |
2808 | return -EIO; | |
2809 | } | |
663996b3 | 2810 | |
60f067b4 JS |
2811 | r = parse_gid(g, &gid); |
2812 | if (r < 0) { | |
2813 | log_error("Failed to parse GID of user."); | |
2814 | return -EIO; | |
2815 | } | |
663996b3 | 2816 | |
60f067b4 JS |
2817 | home = strdup(h); |
2818 | if (!home) | |
2819 | return log_oom(); | |
663996b3 | 2820 | |
60f067b4 JS |
2821 | /* Second, get group memberships */ |
2822 | fd = spawn_getent("initgroups", arg_user, &pid); | |
2823 | if (fd < 0) | |
2824 | return fd; | |
663996b3 | 2825 | |
60f067b4 JS |
2826 | fclose(f); |
2827 | f = fdopen(fd, "r"); | |
2828 | if (!f) | |
2829 | return log_oom(); | |
2830 | fd = -1; | |
663996b3 | 2831 | |
60f067b4 JS |
2832 | if (!fgets(line, sizeof(line), f)) { |
2833 | if (!ferror(f)) { | |
2834 | log_error("Failed to resolve user %s.", arg_user); | |
2835 | return -ESRCH; | |
2836 | } | |
663996b3 | 2837 | |
60f067b4 JS |
2838 | log_error("Failed to read from getent: %m"); |
2839 | return -errno; | |
2840 | } | |
663996b3 | 2841 | |
60f067b4 | 2842 | truncate_nl(line); |
663996b3 | 2843 | |
60f067b4 | 2844 | wait_for_terminate_and_warn("getent initgroups", pid); |
663996b3 | 2845 | |
60f067b4 JS |
2846 | /* Skip over the username and subsequent separator whitespace */ |
2847 | x = line; | |
2848 | x += strcspn(x, WHITESPACE); | |
2849 | x += strspn(x, WHITESPACE); | |
663996b3 | 2850 | |
5eef597e | 2851 | FOREACH_WORD(word, l, x, state) { |
60f067b4 | 2852 | char c[l+1]; |
663996b3 | 2853 | |
5eef597e | 2854 | memcpy(c, word, l); |
60f067b4 | 2855 | c[l] = 0; |
663996b3 | 2856 | |
60f067b4 JS |
2857 | if (!GREEDY_REALLOC(uids, sz, n_uids+1)) |
2858 | return log_oom(); | |
663996b3 | 2859 | |
60f067b4 JS |
2860 | r = parse_uid(c, &uids[n_uids++]); |
2861 | if (r < 0) { | |
2862 | log_error("Failed to parse group data from getent."); | |
2863 | return -EIO; | |
2864 | } | |
2865 | } | |
663996b3 | 2866 | |
60f067b4 JS |
2867 | r = mkdir_parents(home, 0775); |
2868 | if (r < 0) { | |
2869 | log_error("Failed to make home root directory: %s", strerror(-r)); | |
2870 | return r; | |
2871 | } | |
663996b3 | 2872 | |
60f067b4 JS |
2873 | r = mkdir_safe(home, 0755, uid, gid); |
2874 | if (r < 0 && r != -EEXIST) { | |
2875 | log_error("Failed to make home directory: %s", strerror(-r)); | |
2876 | return r; | |
2877 | } | |
663996b3 | 2878 | |
60f067b4 JS |
2879 | fchown(STDIN_FILENO, uid, gid); |
2880 | fchown(STDOUT_FILENO, uid, gid); | |
2881 | fchown(STDERR_FILENO, uid, gid); | |
663996b3 | 2882 | |
60f067b4 JS |
2883 | if (setgroups(n_uids, uids) < 0) { |
2884 | log_error("Failed to set auxiliary groups: %m"); | |
2885 | return -errno; | |
2886 | } | |
663996b3 | 2887 | |
60f067b4 JS |
2888 | if (setresgid(gid, gid, gid) < 0) { |
2889 | log_error("setregid() failed: %m"); | |
2890 | return -errno; | |
663996b3 MS |
2891 | } |
2892 | ||
60f067b4 JS |
2893 | if (setresuid(uid, uid, uid) < 0) { |
2894 | log_error("setreuid() failed: %m"); | |
2895 | return -errno; | |
2896 | } | |
663996b3 | 2897 | |
60f067b4 JS |
2898 | if (_home) { |
2899 | *_home = home; | |
2900 | home = NULL; | |
2901 | } | |
663996b3 | 2902 | |
60f067b4 | 2903 | return 0; |
663996b3 MS |
2904 | } |
2905 | ||
60f067b4 | 2906 | /* |
e842803a MB |
2907 | * Return values: |
2908 | * < 0 : wait_for_terminate() failed to get the state of the | |
2909 | * container, the container was terminated by a signal, or | |
2910 | * failed for an unknown reason. No change is made to the | |
2911 | * container argument. | |
2912 | * > 0 : The program executed in the container terminated with an | |
2913 | * error. The exit code of the program executed in the | |
2914 | * container is returned. No change is made to the container | |
2915 | * argument. | |
2916 | * 0 : The container is being rebooted, has been shut down or exited | |
2917 | * successfully. The container argument has been set to either | |
2918 | * CONTAINER_TERMINATED or CONTAINER_REBOOTED. | |
60f067b4 | 2919 | * |
e842803a MB |
2920 | * That is, success is indicated by a return value of zero, and an |
2921 | * error is indicated by a non-zero value. | |
60f067b4 JS |
2922 | */ |
2923 | static int wait_for_container(pid_t pid, ContainerStatus *container) { | |
14228c0d | 2924 | int r; |
60f067b4 | 2925 | siginfo_t status; |
14228c0d | 2926 | |
60f067b4 | 2927 | r = wait_for_terminate(pid, &status); |
e842803a MB |
2928 | if (r < 0) { |
2929 | log_warning("Failed to wait for container: %s", strerror(-r)); | |
14228c0d | 2930 | return r; |
e842803a | 2931 | } |
14228c0d | 2932 | |
60f067b4 JS |
2933 | switch (status.si_code) { |
2934 | case CLD_EXITED: | |
2935 | r = status.si_status; | |
2936 | if (r == 0) { | |
2937 | if (!arg_quiet) | |
2938 | log_debug("Container %s exited successfully.", | |
2939 | arg_machine); | |
14228c0d | 2940 | |
60f067b4 JS |
2941 | *container = CONTAINER_TERMINATED; |
2942 | } else { | |
2943 | log_error("Container %s failed with error code %i.", | |
2944 | arg_machine, status.si_status); | |
60f067b4 JS |
2945 | } |
2946 | break; | |
2947 | ||
2948 | case CLD_KILLED: | |
2949 | if (status.si_status == SIGINT) { | |
2950 | if (!arg_quiet) | |
2951 | log_info("Container %s has been shut down.", | |
2952 | arg_machine); | |
14228c0d | 2953 | |
60f067b4 JS |
2954 | *container = CONTAINER_TERMINATED; |
2955 | r = 0; | |
2956 | break; | |
2957 | } else if (status.si_status == SIGHUP) { | |
2958 | if (!arg_quiet) | |
2959 | log_info("Container %s is being rebooted.", | |
2960 | arg_machine); | |
14228c0d | 2961 | |
60f067b4 JS |
2962 | *container = CONTAINER_REBOOTED; |
2963 | r = 0; | |
2964 | break; | |
2965 | } | |
2966 | /* CLD_KILLED fallthrough */ | |
2967 | ||
2968 | case CLD_DUMPED: | |
2969 | log_error("Container %s terminated by signal %s.", | |
2970 | arg_machine, signal_to_string(status.si_status)); | |
2971 | r = -1; | |
2972 | break; | |
2973 | ||
2974 | default: | |
2975 | log_error("Container %s failed due to unknown reason.", | |
2976 | arg_machine); | |
2977 | r = -1; | |
2978 | break; | |
14228c0d | 2979 | } |
60f067b4 JS |
2980 | |
2981 | return r; | |
14228c0d MB |
2982 | } |
2983 | ||
60f067b4 JS |
2984 | static void nop_handler(int sig) {} |
2985 | ||
663996b3 | 2986 | int main(int argc, char *argv[]) { |
60f067b4 JS |
2987 | |
2988 | _cleanup_free_ char *kdbus_domain = NULL, *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL; | |
2989 | bool root_device_rw = true, home_device_rw = true, srv_device_rw = true; | |
2990 | _cleanup_close_ int master = -1, kdbus_fd = -1, image_fd = -1; | |
2991 | _cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 }; | |
2992 | _cleanup_fdset_free_ FDSet *fds = NULL; | |
2993 | int r = EXIT_FAILURE, k, n_fd_passed, loop_nr = -1; | |
663996b3 | 2994 | const char *console = NULL; |
60f067b4 JS |
2995 | char veth_name[IFNAMSIZ]; |
2996 | bool secondary = false; | |
2997 | sigset_t mask, mask_chld; | |
2998 | pid_t pid = 0; | |
663996b3 MS |
2999 | |
3000 | log_parse_environment(); | |
3001 | log_open(); | |
3002 | ||
3003 | k = parse_argv(argc, argv); | |
3004 | if (k < 0) | |
3005 | goto finish; | |
3006 | else if (k == 0) { | |
3007 | r = EXIT_SUCCESS; | |
3008 | goto finish; | |
3009 | } | |
3010 | ||
60f067b4 JS |
3011 | if (!arg_image) { |
3012 | if (arg_directory) { | |
3013 | char *p; | |
663996b3 | 3014 | |
60f067b4 JS |
3015 | p = path_make_absolute_cwd(arg_directory); |
3016 | free(arg_directory); | |
3017 | arg_directory = p; | |
3018 | } else | |
3019 | arg_directory = get_current_dir_name(); | |
663996b3 | 3020 | |
60f067b4 JS |
3021 | if (!arg_directory) { |
3022 | log_error("Failed to determine path, please use -D."); | |
3023 | goto finish; | |
3024 | } | |
3025 | path_kill_slashes(arg_directory); | |
663996b3 MS |
3026 | } |
3027 | ||
663996b3 | 3028 | if (!arg_machine) { |
60f067b4 | 3029 | arg_machine = strdup(basename(arg_image ? arg_image : arg_directory)); |
663996b3 MS |
3030 | if (!arg_machine) { |
3031 | log_oom(); | |
3032 | goto finish; | |
3033 | } | |
3034 | ||
3035 | hostname_cleanup(arg_machine, false); | |
3036 | if (isempty(arg_machine)) { | |
3037 | log_error("Failed to determine machine name automatically, please use -M."); | |
3038 | goto finish; | |
3039 | } | |
3040 | } | |
3041 | ||
3042 | if (geteuid() != 0) { | |
3043 | log_error("Need to be root."); | |
3044 | goto finish; | |
3045 | } | |
3046 | ||
3047 | if (sd_booted() <= 0) { | |
3048 | log_error("Not running on a systemd system."); | |
3049 | goto finish; | |
3050 | } | |
3051 | ||
663996b3 MS |
3052 | log_close(); |
3053 | n_fd_passed = sd_listen_fds(false); | |
3054 | if (n_fd_passed > 0) { | |
3055 | k = fdset_new_listen_fds(&fds, false); | |
3056 | if (k < 0) { | |
3057 | log_error("Failed to collect file descriptors: %s", strerror(-k)); | |
3058 | goto finish; | |
3059 | } | |
3060 | } | |
3061 | fdset_close_others(fds); | |
3062 | log_open(); | |
3063 | ||
60f067b4 JS |
3064 | if (arg_directory) { |
3065 | if (path_equal(arg_directory, "/")) { | |
3066 | log_error("Spawning container on root directory not supported."); | |
3067 | goto finish; | |
3068 | } | |
3069 | ||
3070 | if (arg_boot) { | |
3071 | if (path_is_os_tree(arg_directory) <= 0) { | |
e842803a | 3072 | log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory); |
60f067b4 JS |
3073 | goto finish; |
3074 | } | |
3075 | } else { | |
3076 | const char *p; | |
3077 | ||
3078 | p = strappenda(arg_directory, | |
3079 | argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/"); | |
3080 | if (access(p, F_OK) < 0) { | |
3081 | log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory); | |
3082 | goto finish; | |
3083 | ||
3084 | } | |
3085 | } | |
3086 | } else { | |
3087 | char template[] = "/tmp/nspawn-root-XXXXXX"; | |
3088 | ||
3089 | if (!mkdtemp(template)) { | |
3090 | log_error("Failed to create temporary directory: %m"); | |
3091 | r = -errno; | |
3092 | goto finish; | |
3093 | } | |
3094 | ||
3095 | arg_directory = strdup(template); | |
3096 | if (!arg_directory) { | |
3097 | r = log_oom(); | |
3098 | goto finish; | |
3099 | } | |
3100 | ||
3101 | image_fd = setup_image(&device_path, &loop_nr); | |
3102 | if (image_fd < 0) { | |
3103 | r = image_fd; | |
3104 | goto finish; | |
3105 | } | |
3106 | ||
5eef597e MP |
3107 | r = dissect_image(image_fd, |
3108 | &root_device, &root_device_rw, | |
3109 | &home_device, &home_device_rw, | |
3110 | &srv_device, &srv_device_rw, | |
3111 | &secondary); | |
60f067b4 JS |
3112 | if (r < 0) |
3113 | goto finish; | |
3114 | } | |
3115 | ||
663996b3 MS |
3116 | master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY); |
3117 | if (master < 0) { | |
3118 | log_error("Failed to acquire pseudo tty: %m"); | |
3119 | goto finish; | |
3120 | } | |
3121 | ||
3122 | console = ptsname(master); | |
3123 | if (!console) { | |
3124 | log_error("Failed to determine tty name: %m"); | |
3125 | goto finish; | |
3126 | } | |
3127 | ||
60f067b4 JS |
3128 | if (!arg_quiet) |
3129 | log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.", | |
3130 | arg_machine, arg_image ? arg_image : arg_directory); | |
663996b3 MS |
3131 | |
3132 | if (unlockpt(master) < 0) { | |
3133 | log_error("Failed to unlock tty: %m"); | |
3134 | goto finish; | |
3135 | } | |
3136 | ||
60f067b4 JS |
3137 | if (access("/dev/kdbus/control", F_OK) >= 0) { |
3138 | ||
3139 | if (arg_share_system) { | |
3140 | kdbus_domain = strdup("/dev/kdbus"); | |
3141 | if (!kdbus_domain) { | |
3142 | log_oom(); | |
3143 | goto finish; | |
3144 | } | |
3145 | } else { | |
3146 | const char *ns; | |
663996b3 | 3147 | |
60f067b4 JS |
3148 | ns = strappenda("machine-", arg_machine); |
3149 | kdbus_fd = bus_kernel_create_domain(ns, &kdbus_domain); | |
3150 | if (r < 0) | |
3151 | log_debug("Failed to create kdbus domain: %s", strerror(-r)); | |
3152 | else | |
3153 | log_debug("Successfully created kdbus domain as %s", kdbus_domain); | |
3154 | } | |
663996b3 MS |
3155 | } |
3156 | ||
3157 | if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) { | |
60f067b4 | 3158 | log_error("Failed to create kmsg socket pair: %m"); |
663996b3 MS |
3159 | goto finish; |
3160 | } | |
3161 | ||
5eef597e MP |
3162 | sd_notify(false, |
3163 | "READY=1\n" | |
3164 | "STATUS=Container running."); | |
663996b3 MS |
3165 | |
3166 | assert_se(sigemptyset(&mask) == 0); | |
60f067b4 JS |
3167 | assert_se(sigemptyset(&mask_chld) == 0); |
3168 | sigaddset(&mask_chld, SIGCHLD); | |
663996b3 MS |
3169 | sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1); |
3170 | assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0); | |
3171 | ||
3172 | for (;;) { | |
60f067b4 | 3173 | ContainerStatus container_status; |
5eef597e | 3174 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; |
60f067b4 JS |
3175 | struct sigaction sa = { |
3176 | .sa_handler = nop_handler, | |
3177 | .sa_flags = SA_NOCLDSTOP, | |
3178 | }; | |
3179 | ||
5eef597e MP |
3180 | r = barrier_create(&barrier); |
3181 | if (r < 0) { | |
3182 | log_error("Cannot initialize IPC barrier: %s", strerror(-r)); | |
3183 | goto finish; | |
3184 | } | |
3185 | ||
60f067b4 JS |
3186 | /* Child can be killed before execv(), so handle SIGCHLD |
3187 | * in order to interrupt parent's blocking calls and | |
3188 | * give it a chance to call wait() and terminate. */ | |
3189 | r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL); | |
3190 | if (r < 0) { | |
3191 | log_error("Failed to change the signal mask: %m"); | |
663996b3 MS |
3192 | goto finish; |
3193 | } | |
3194 | ||
60f067b4 JS |
3195 | r = sigaction(SIGCHLD, &sa, NULL); |
3196 | if (r < 0) { | |
3197 | log_error("Failed to install SIGCHLD handler: %m"); | |
663996b3 MS |
3198 | goto finish; |
3199 | } | |
3200 | ||
5eef597e MP |
3201 | pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWNS| |
3202 | (arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)| | |
3203 | (arg_private_network ? CLONE_NEWNET : 0), NULL); | |
663996b3 MS |
3204 | if (pid < 0) { |
3205 | if (errno == EINVAL) | |
3206 | log_error("clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m"); | |
3207 | else | |
3208 | log_error("clone() failed: %m"); | |
3209 | ||
60f067b4 | 3210 | r = pid; |
663996b3 MS |
3211 | goto finish; |
3212 | } | |
3213 | ||
3214 | if (pid == 0) { | |
3215 | /* child */ | |
60f067b4 | 3216 | _cleanup_free_ char *home = NULL; |
663996b3 MS |
3217 | unsigned n_env = 2; |
3218 | const char *envp[] = { | |
60f067b4 | 3219 | "PATH=" DEFAULT_PATH_SPLIT_USR, |
663996b3 MS |
3220 | "container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */ |
3221 | NULL, /* TERM */ | |
3222 | NULL, /* HOME */ | |
3223 | NULL, /* USER */ | |
3224 | NULL, /* LOGNAME */ | |
3225 | NULL, /* container_uuid */ | |
3226 | NULL, /* LISTEN_FDS */ | |
3227 | NULL, /* LISTEN_PID */ | |
3228 | NULL | |
3229 | }; | |
60f067b4 | 3230 | char **env_use; |
663996b3 | 3231 | |
5eef597e MP |
3232 | barrier_set_role(&barrier, BARRIER_CHILD); |
3233 | ||
663996b3 MS |
3234 | envp[n_env] = strv_find_prefix(environ, "TERM="); |
3235 | if (envp[n_env]) | |
3236 | n_env ++; | |
3237 | ||
60f067b4 | 3238 | master = safe_close(master); |
663996b3 MS |
3239 | |
3240 | close_nointr(STDIN_FILENO); | |
3241 | close_nointr(STDOUT_FILENO); | |
3242 | close_nointr(STDERR_FILENO); | |
3243 | ||
60f067b4 | 3244 | kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]); |
663996b3 MS |
3245 | |
3246 | reset_all_signal_handlers(); | |
5eef597e | 3247 | reset_signal_mask(); |
663996b3 MS |
3248 | |
3249 | k = open_terminal(console, O_RDWR); | |
3250 | if (k != STDIN_FILENO) { | |
3251 | if (k >= 0) { | |
60f067b4 | 3252 | safe_close(k); |
663996b3 MS |
3253 | k = -EINVAL; |
3254 | } | |
3255 | ||
3256 | log_error("Failed to open console: %s", strerror(-k)); | |
5eef597e | 3257 | _exit(EXIT_FAILURE); |
663996b3 MS |
3258 | } |
3259 | ||
3260 | if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO || | |
3261 | dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) { | |
3262 | log_error("Failed to duplicate console: %m"); | |
5eef597e | 3263 | _exit(EXIT_FAILURE); |
663996b3 MS |
3264 | } |
3265 | ||
3266 | if (setsid() < 0) { | |
3267 | log_error("setsid() failed: %m"); | |
5eef597e | 3268 | _exit(EXIT_FAILURE); |
663996b3 MS |
3269 | } |
3270 | ||
60f067b4 | 3271 | if (reset_audit_loginuid() < 0) |
5eef597e | 3272 | _exit(EXIT_FAILURE); |
60f067b4 | 3273 | |
663996b3 MS |
3274 | if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) { |
3275 | log_error("PR_SET_PDEATHSIG failed: %m"); | |
5eef597e | 3276 | _exit(EXIT_FAILURE); |
663996b3 MS |
3277 | } |
3278 | ||
663996b3 MS |
3279 | /* Mark everything as slave, so that we still |
3280 | * receive mounts from the real root, but don't | |
3281 | * propagate mounts to the real root. */ | |
3282 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) { | |
3283 | log_error("MS_SLAVE|MS_REC failed: %m"); | |
5eef597e | 3284 | _exit(EXIT_FAILURE); |
663996b3 MS |
3285 | } |
3286 | ||
60f067b4 JS |
3287 | if (mount_devices(arg_directory, |
3288 | root_device, root_device_rw, | |
3289 | home_device, home_device_rw, | |
3290 | srv_device, srv_device_rw) < 0) | |
5eef597e | 3291 | _exit(EXIT_FAILURE); |
e842803a | 3292 | |
663996b3 MS |
3293 | /* Turn directory into bind mount */ |
3294 | if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) { | |
60f067b4 | 3295 | log_error("Failed to make bind mount: %m"); |
5eef597e | 3296 | _exit(EXIT_FAILURE); |
663996b3 MS |
3297 | } |
3298 | ||
5eef597e MP |
3299 | r = setup_volatile(arg_directory); |
3300 | if (r < 0) | |
3301 | _exit(EXIT_FAILURE); | |
3302 | ||
3303 | if (setup_volatile_state(arg_directory) < 0) | |
3304 | _exit(EXIT_FAILURE); | |
3305 | ||
3306 | r = base_filesystem_create(arg_directory); | |
3307 | if (r < 0) | |
3308 | _exit(EXIT_FAILURE); | |
3309 | ||
60f067b4 JS |
3310 | if (arg_read_only) { |
3311 | k = bind_remount_recursive(arg_directory, true); | |
3312 | if (k < 0) { | |
3313 | log_error("Failed to make tree read-only: %s", strerror(-k)); | |
5eef597e | 3314 | _exit(EXIT_FAILURE); |
663996b3 | 3315 | } |
60f067b4 | 3316 | } |
663996b3 MS |
3317 | |
3318 | if (mount_all(arg_directory) < 0) | |
5eef597e | 3319 | _exit(EXIT_FAILURE); |
663996b3 MS |
3320 | |
3321 | if (copy_devnodes(arg_directory) < 0) | |
5eef597e | 3322 | _exit(EXIT_FAILURE); |
663996b3 MS |
3323 | |
3324 | if (setup_ptmx(arg_directory) < 0) | |
5eef597e | 3325 | _exit(EXIT_FAILURE); |
663996b3 MS |
3326 | |
3327 | dev_setup(arg_directory); | |
3328 | ||
e842803a | 3329 | if (setup_seccomp() < 0) |
5eef597e | 3330 | _exit(EXIT_FAILURE); |
60f067b4 | 3331 | |
663996b3 | 3332 | if (setup_dev_console(arg_directory, console) < 0) |
5eef597e | 3333 | _exit(EXIT_FAILURE); |
663996b3 MS |
3334 | |
3335 | if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0) | |
5eef597e | 3336 | _exit(EXIT_FAILURE); |
663996b3 | 3337 | |
60f067b4 | 3338 | kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]); |
663996b3 MS |
3339 | |
3340 | if (setup_boot_id(arg_directory) < 0) | |
5eef597e | 3341 | _exit(EXIT_FAILURE); |
663996b3 MS |
3342 | |
3343 | if (setup_timezone(arg_directory) < 0) | |
5eef597e | 3344 | _exit(EXIT_FAILURE); |
663996b3 MS |
3345 | |
3346 | if (setup_resolv_conf(arg_directory) < 0) | |
5eef597e | 3347 | _exit(EXIT_FAILURE); |
663996b3 MS |
3348 | |
3349 | if (setup_journal(arg_directory) < 0) | |
5eef597e | 3350 | _exit(EXIT_FAILURE); |
663996b3 | 3351 | |
60f067b4 | 3352 | if (mount_binds(arg_directory, arg_bind, false) < 0) |
5eef597e | 3353 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3354 | |
3355 | if (mount_binds(arg_directory, arg_bind_ro, true) < 0) | |
5eef597e | 3356 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3357 | |
3358 | if (mount_tmpfs(arg_directory) < 0) | |
5eef597e | 3359 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3360 | |
3361 | if (setup_kdbus(arg_directory, kdbus_domain) < 0) | |
5eef597e | 3362 | _exit(EXIT_FAILURE); |
663996b3 | 3363 | |
60f067b4 JS |
3364 | /* Tell the parent that we are ready, and that |
3365 | * it can cgroupify us to that we lack access | |
3366 | * to certain devices and resources. */ | |
5eef597e | 3367 | barrier_place(&barrier); |
663996b3 MS |
3368 | |
3369 | if (chdir(arg_directory) < 0) { | |
3370 | log_error("chdir(%s) failed: %m", arg_directory); | |
5eef597e | 3371 | _exit(EXIT_FAILURE); |
663996b3 MS |
3372 | } |
3373 | ||
3374 | if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) { | |
3375 | log_error("mount(MS_MOVE) failed: %m"); | |
5eef597e | 3376 | _exit(EXIT_FAILURE); |
663996b3 MS |
3377 | } |
3378 | ||
3379 | if (chroot(".") < 0) { | |
3380 | log_error("chroot() failed: %m"); | |
5eef597e | 3381 | _exit(EXIT_FAILURE); |
663996b3 MS |
3382 | } |
3383 | ||
3384 | if (chdir("/") < 0) { | |
3385 | log_error("chdir() failed: %m"); | |
5eef597e | 3386 | _exit(EXIT_FAILURE); |
663996b3 MS |
3387 | } |
3388 | ||
3389 | umask(0022); | |
3390 | ||
60f067b4 JS |
3391 | if (arg_private_network) |
3392 | loopback_setup(); | |
663996b3 MS |
3393 | |
3394 | if (drop_capabilities() < 0) { | |
3395 | log_error("drop_capabilities() failed: %m"); | |
5eef597e | 3396 | _exit(EXIT_FAILURE); |
663996b3 MS |
3397 | } |
3398 | ||
60f067b4 JS |
3399 | r = change_uid_gid(&home); |
3400 | if (r < 0) | |
5eef597e | 3401 | _exit(EXIT_FAILURE); |
663996b3 MS |
3402 | |
3403 | if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) || | |
3404 | (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) || | |
3405 | (asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) { | |
3406 | log_oom(); | |
5eef597e | 3407 | _exit(EXIT_FAILURE); |
663996b3 MS |
3408 | } |
3409 | ||
14228c0d | 3410 | if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) { |
60f067b4 JS |
3411 | char as_uuid[37]; |
3412 | ||
3413 | if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_format_as_uuid(arg_uuid, as_uuid)) < 0) { | |
663996b3 | 3414 | log_oom(); |
5eef597e | 3415 | _exit(EXIT_FAILURE); |
663996b3 MS |
3416 | } |
3417 | } | |
3418 | ||
3419 | if (fdset_size(fds) > 0) { | |
3420 | k = fdset_cloexec(fds, false); | |
3421 | if (k < 0) { | |
3422 | log_error("Failed to unset O_CLOEXEC for file descriptors."); | |
5eef597e | 3423 | _exit(EXIT_FAILURE); |
663996b3 MS |
3424 | } |
3425 | ||
3426 | if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) || | |
14228c0d | 3427 | (asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) { |
663996b3 | 3428 | log_oom(); |
5eef597e | 3429 | _exit(EXIT_FAILURE); |
663996b3 MS |
3430 | } |
3431 | } | |
3432 | ||
3433 | setup_hostname(); | |
3434 | ||
60f067b4 JS |
3435 | if (arg_personality != 0xffffffffLU) { |
3436 | if (personality(arg_personality) < 0) { | |
3437 | log_error("personality() failed: %m"); | |
5eef597e | 3438 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3439 | } |
3440 | } else if (secondary) { | |
3441 | if (personality(PER_LINUX32) < 0) { | |
3442 | log_error("personality() failed: %m"); | |
5eef597e | 3443 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3444 | } |
3445 | } | |
3446 | ||
3447 | #ifdef HAVE_SELINUX | |
3448 | if (arg_selinux_context) | |
3449 | if (setexeccon((security_context_t) arg_selinux_context) < 0) { | |
3450 | log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context); | |
5eef597e | 3451 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3452 | } |
3453 | #endif | |
3454 | ||
3455 | if (!strv_isempty(arg_setenv)) { | |
3456 | char **n; | |
3457 | ||
3458 | n = strv_env_merge(2, envp, arg_setenv); | |
3459 | if (!n) { | |
3460 | log_oom(); | |
5eef597e | 3461 | _exit(EXIT_FAILURE); |
60f067b4 JS |
3462 | } |
3463 | ||
3464 | env_use = n; | |
3465 | } else | |
3466 | env_use = (char**) envp; | |
3467 | ||
3468 | /* Wait until the parent is ready with the setup, too... */ | |
5eef597e MP |
3469 | if (!barrier_place_and_sync(&barrier)) |
3470 | _exit(EXIT_FAILURE); | |
60f067b4 | 3471 | |
663996b3 MS |
3472 | if (arg_boot) { |
3473 | char **a; | |
3474 | size_t l; | |
3475 | ||
3476 | /* Automatically search for the init system */ | |
3477 | ||
3478 | l = 1 + argc - optind; | |
3479 | a = newa(char*, l + 1); | |
3480 | memcpy(a + 1, argv + optind, l * sizeof(char*)); | |
3481 | ||
3482 | a[0] = (char*) "/usr/lib/systemd/systemd"; | |
60f067b4 | 3483 | execve(a[0], a, env_use); |
663996b3 MS |
3484 | |
3485 | a[0] = (char*) "/lib/systemd/systemd"; | |
60f067b4 | 3486 | execve(a[0], a, env_use); |
663996b3 MS |
3487 | |
3488 | a[0] = (char*) "/sbin/init"; | |
60f067b4 | 3489 | execve(a[0], a, env_use); |
663996b3 | 3490 | } else if (argc > optind) |
60f067b4 | 3491 | execvpe(argv[optind], argv + optind, env_use); |
663996b3 MS |
3492 | else { |
3493 | chdir(home ? home : "/root"); | |
60f067b4 JS |
3494 | execle("/bin/bash", "-bash", NULL, env_use); |
3495 | execle("/bin/sh", "-sh", NULL, env_use); | |
663996b3 MS |
3496 | } |
3497 | ||
3498 | log_error("execv() failed: %m"); | |
663996b3 MS |
3499 | _exit(EXIT_FAILURE); |
3500 | } | |
3501 | ||
5eef597e | 3502 | barrier_set_role(&barrier, BARRIER_PARENT); |
663996b3 MS |
3503 | fdset_free(fds); |
3504 | fds = NULL; | |
3505 | ||
5eef597e MP |
3506 | /* wait for child-setup to be done */ |
3507 | if (barrier_place_and_sync(&barrier)) { | |
3508 | int ifi = 0; | |
60f067b4 | 3509 | |
e842803a MB |
3510 | r = move_network_interfaces(pid); |
3511 | if (r < 0) | |
3512 | goto finish; | |
60f067b4 | 3513 | |
5eef597e | 3514 | r = setup_veth(pid, veth_name, &ifi); |
e842803a MB |
3515 | if (r < 0) |
3516 | goto finish; | |
60f067b4 | 3517 | |
5eef597e | 3518 | r = setup_bridge(veth_name, &ifi); |
e842803a MB |
3519 | if (r < 0) |
3520 | goto finish; | |
60f067b4 | 3521 | |
e842803a MB |
3522 | r = setup_macvlan(pid); |
3523 | if (r < 0) | |
3524 | goto finish; | |
60f067b4 | 3525 | |
5eef597e MP |
3526 | r = register_machine(pid, ifi); |
3527 | if (r < 0) | |
3528 | goto finish; | |
3529 | ||
e842803a MB |
3530 | /* Block SIGCHLD here, before notifying child. |
3531 | * process_pty() will handle it with the other signals. */ | |
3532 | r = sigprocmask(SIG_BLOCK, &mask_chld, NULL); | |
3533 | if (r < 0) | |
3534 | goto finish; | |
60f067b4 | 3535 | |
e842803a MB |
3536 | /* Reset signal to default */ |
3537 | r = default_signals(SIGCHLD, -1); | |
3538 | if (r < 0) | |
3539 | goto finish; | |
663996b3 | 3540 | |
e842803a MB |
3541 | /* Notify the child that the parent is ready with all |
3542 | * its setup, and that the child can now hand over | |
3543 | * control to the code to run inside the container. */ | |
5eef597e | 3544 | barrier_place(&barrier); |
663996b3 | 3545 | |
e842803a MB |
3546 | k = process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3); |
3547 | if (k < 0) { | |
3548 | r = EXIT_FAILURE; | |
3549 | break; | |
3550 | } | |
663996b3 | 3551 | |
e842803a MB |
3552 | if (!arg_quiet) |
3553 | putc('\n', stdout); | |
663996b3 | 3554 | |
e842803a MB |
3555 | /* Kill if it is not dead yet anyway */ |
3556 | terminate_machine(pid); | |
3557 | } | |
60f067b4 | 3558 | |
e842803a | 3559 | /* Normally redundant, but better safe than sorry */ |
60f067b4 | 3560 | kill(pid, SIGKILL); |
663996b3 | 3561 | |
60f067b4 JS |
3562 | r = wait_for_container(pid, &container_status); |
3563 | pid = 0; | |
3564 | ||
3565 | if (r < 0) { | |
e842803a MB |
3566 | /* We failed to wait for the container, or the |
3567 | * container exited abnormally */ | |
663996b3 MS |
3568 | r = EXIT_FAILURE; |
3569 | break; | |
e842803a MB |
3570 | } else if (r > 0 || container_status == CONTAINER_TERMINATED) |
3571 | /* The container exited with a non-zero | |
3572 | * status, or with zero status and no reboot | |
3573 | * was requested. */ | |
663996b3 | 3574 | break; |
60f067b4 JS |
3575 | |
3576 | /* CONTAINER_REBOOTED, loop again */ | |
e842803a MB |
3577 | |
3578 | if (arg_keep_unit) { | |
3579 | /* Special handling if we are running as a | |
3580 | * service: instead of simply restarting the | |
3581 | * machine we want to restart the entire | |
3582 | * service, so let's inform systemd about this | |
3583 | * with the special exit code 133. The service | |
3584 | * file uses RestartForceExitStatus=133 so | |
3585 | * that this results in a full nspawn | |
3586 | * restart. This is necessary since we might | |
3587 | * have cgroup parameters set we want to have | |
3588 | * flushed out. */ | |
3589 | r = 133; | |
3590 | break; | |
3591 | } | |
663996b3 MS |
3592 | } |
3593 | ||
3594 | finish: | |
5eef597e MP |
3595 | sd_notify(false, |
3596 | "STOPPING=1\n" | |
3597 | "STATUS=Terminating..."); | |
3598 | ||
60f067b4 | 3599 | loop_remove(loop_nr, &image_fd); |
663996b3 | 3600 | |
14228c0d MB |
3601 | if (pid > 0) |
3602 | kill(pid, SIGKILL); | |
663996b3 MS |
3603 | |
3604 | free(arg_directory); | |
3605 | free(arg_machine); | |
60f067b4 JS |
3606 | free(arg_user); |
3607 | strv_free(arg_setenv); | |
3608 | strv_free(arg_network_interfaces); | |
3609 | strv_free(arg_network_macvlan); | |
3610 | strv_free(arg_bind); | |
3611 | strv_free(arg_bind_ro); | |
3612 | strv_free(arg_tmpfs); | |
663996b3 MS |
3613 | |
3614 | return r; | |
3615 | } |