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[project/procd.git] / jail / jail.c
1 /*
2 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
3 * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <sys/mount.h>
17 #include <sys/prctl.h>
18 #include <sys/wait.h>
19 #include <sys/types.h>
20 #include <sys/time.h>
21 #include <sys/resource.h>
22 #include <sys/stat.h>
23 #include <sys/sysmacros.h>
24
25 /* musl only defined 15 limit types, make sure all 16 are supported */
26 #ifndef RLIMIT_RTTIME
27 #define RLIMIT_RTTIME 15
28 #undef RLIMIT_NLIMITS
29 #define RLIMIT_NLIMITS 16
30 #undef RLIM_NLIMITS
31 #define RLIM_NLIMITS 16
32 #endif
33
34 #include <assert.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <errno.h>
38 #include <pwd.h>
39 #include <grp.h>
40 #include <string.h>
41 #include <fcntl.h>
42 #include <sched.h>
43 #include <linux/filter.h>
44 #include <linux/limits.h>
45 #include <linux/nsfs.h>
46 #include <linux/securebits.h>
47 #include <signal.h>
48 #include <inttypes.h>
49
50 #include "capabilities.h"
51 #include "elf.h"
52 #include "fs.h"
53 #include "jail.h"
54 #include "log.h"
55 #include "seccomp-oci.h"
56 #include "cgroups.h"
57 #include "netifd.h"
58
59 #include <libubox/blobmsg.h>
60 #include <libubox/blobmsg_json.h>
61 #include <libubox/list.h>
62 #include <libubox/vlist.h>
63 #include <libubox/uloop.h>
64 #include <libubox/utils.h>
65 #include <libubus.h>
66
67 #ifndef CLONE_NEWCGROUP
68 #define CLONE_NEWCGROUP 0x02000000
69 #endif
70
71 #define STACK_SIZE (1024 * 1024)
72 #define OPT_ARGS "cC:d:EfFG:h:ij:J:ln:NoO:pP:r:R:sS:uU:w:T:y"
73
74 #define OCI_VERSION_STRING "1.0.2"
75
76 struct hook_execvpe {
77 char *file;
78 char **argv;
79 char **envp;
80 int timeout;
81 };
82
83 struct sysctl_val {
84 char *entry;
85 char *value;
86 };
87
88 struct mknod_args {
89 char *path;
90 mode_t mode;
91 dev_t dev;
92 uid_t uid;
93 gid_t gid;
94 };
95
96 static struct {
97 char *name;
98 char *hostname;
99 char **jail_argv;
100 char *cwd;
101 char *seccomp;
102 struct sock_fprog *ociseccomp;
103 char *capabilities;
104 struct jail_capset capset;
105 char *user;
106 char *group;
107 char *extroot;
108 char *overlaydir;
109 char *tmpoverlaysize;
110 char **envp;
111 char *uidmap;
112 char *gidmap;
113 char *pidfile;
114 struct sysctl_val **sysctl;
115 int no_new_privs;
116 int namespace;
117 struct {
118 int pid;
119 int net;
120 int ns;
121 int ipc;
122 int uts;
123 int user;
124 int cgroup;
125 #ifdef CLONE_NEWTIME
126 int time;
127 #endif
128 } setns;
129 int procfs;
130 int ronly;
131 int sysfs;
132 int console;
133 int pw_uid;
134 int pw_gid;
135 int gr_gid;
136 int root_map_uid;
137 gid_t *additional_gids;
138 size_t num_additional_gids;
139 mode_t umask;
140 bool set_umask;
141 int require_jail;
142 struct {
143 struct hook_execvpe **createRuntime;
144 struct hook_execvpe **createContainer;
145 struct hook_execvpe **startContainer;
146 struct hook_execvpe **poststart;
147 struct hook_execvpe **poststop;
148 } hooks;
149 struct rlimit *rlimits[RLIM_NLIMITS];
150 int oom_score_adj;
151 bool set_oom_score_adj;
152 struct mknod_args **devices;
153 char *ocibundle;
154 bool immediately;
155 struct blob_attr *annotations;
156 } opts;
157
158 static struct blob_buf ocibuf;
159
160 extern int pivot_root(const char *new_root, const char *put_old);
161
162 int debug = 0;
163
164 static char child_stack[STACK_SIZE];
165
166 static struct ubus_context *parent_ctx;
167
168 int console_fd;
169
170
171 static inline bool has_namespaces(void)
172 {
173 return ((opts.setns.pid != -1) ||
174 (opts.setns.net != -1) ||
175 (opts.setns.ns != -1) ||
176 (opts.setns.ipc != -1) ||
177 (opts.setns.uts != -1) ||
178 (opts.setns.user != -1) ||
179 (opts.setns.cgroup != -1) ||
180 #ifdef CLONE_NEWTIME
181 (opts.setns.time != -1) ||
182 #endif
183 opts.namespace);
184 }
185
186 static void free_oci_envp(char **p) {
187 char **tmp;
188
189 if (p) {
190 tmp = p;
191 while (*tmp)
192 free(*(tmp++));
193
194 free(p);
195 }
196 }
197
198 static void free_hooklist(struct hook_execvpe **hooklist)
199 {
200 struct hook_execvpe *cur;
201
202 if (!hooklist)
203 return;
204
205 cur = *hooklist;
206 while (cur) {
207 free_oci_envp(cur->argv);
208 free_oci_envp(cur->envp);
209 free(cur->file);
210 free(cur++);
211 }
212 free(hooklist);
213 }
214
215 static void free_sysctl(void) {
216 struct sysctl_val *cur;
217 cur = *opts.sysctl;
218
219 while (cur) {
220 free(cur->entry);
221 free(cur->value);
222 free(cur++);
223 }
224 free(opts.sysctl);
225 }
226
227 static void free_devices(void) {
228 struct mknod_args **cur;
229
230 if (!opts.devices)
231 return;
232
233 cur = opts.devices;
234
235 while (*cur) {
236 free((*cur)->path);
237 free(*(cur++));
238 }
239 free(opts.devices);
240 }
241
242 static void free_rlimits(void) {
243 int type;
244
245 for (type = 0; type < RLIM_NLIMITS; ++type)
246 free(opts.rlimits[type]);
247 }
248
249 static void free_opts(bool parent) {
250
251 free_library_search();
252 mount_free();
253 cgroups_free();
254
255 /* we need to keep argv, envp and seccomp filter in child */
256 if (parent) { /* parent-only */
257 if (opts.ociseccomp) {
258 free(opts.ociseccomp->filter);
259 free(opts.ociseccomp);
260 }
261
262 free_oci_envp(opts.jail_argv);
263 free_oci_envp(opts.envp);
264 }
265
266 free_rlimits();
267 free_sysctl();
268 free_devices();
269 free(opts.hostname);
270 free(opts.cwd);
271 free(opts.uidmap);
272 free(opts.gidmap);
273 free(opts.annotations);
274 free(opts.extroot);
275 free(opts.overlaydir);
276 free_hooklist(opts.hooks.createRuntime);
277 free_hooklist(opts.hooks.createContainer);
278 free_hooklist(opts.hooks.startContainer);
279 free_hooklist(opts.hooks.poststart);
280 free_hooklist(opts.hooks.poststop);
281 }
282
283 static int mount_overlay(char *jail_root, char *overlaydir) {
284 char *upperdir, *workdir, *optsstr, *upperetc, *upperresolvconf;
285 const char mountoptsformat[] = "lowerdir=%s,upperdir=%s,workdir=%s";
286 int ret = -1, fd;
287
288 if (asprintf(&upperdir, "%s%s", overlaydir, "/upper") < 0)
289 goto out;
290
291 if (asprintf(&workdir, "%s%s", overlaydir, "/work") < 0)
292 goto upper_printf;
293
294 if (asprintf(&optsstr, mountoptsformat, jail_root, upperdir, workdir) < 0)
295 goto work_printf;
296
297 if (mkdir_p(upperdir, 0755) || mkdir_p(workdir, 0755))
298 goto opts_printf;
299
300 /*
301 * make sure /etc/resolv.conf exists in overlay and is owned by jail userns root
302 * this is to work-around a bug in overlayfs described in the overlayfs-userns
303 * patch:
304 * 3. modification of a file 'hithere' which is in l but not yet
305 * in u, and which is not owned by T, is not allowed, even if
306 * writes to u are allowed. This may be a bug in overlayfs,
307 * but it is safe behavior.
308 */
309 if (asprintf(&upperetc, "%s/etc", upperdir) < 0)
310 goto opts_printf;
311
312 if (mkdir_p(upperetc, 0755))
313 goto upper_etc_printf;
314
315 if (asprintf(&upperresolvconf, "%s/resolv.conf", upperetc) < 0)
316 goto upper_etc_printf;
317
318 fd = creat(upperresolvconf, 0644);
319 if (fd < 0) {
320 if (errno != EEXIST)
321 ERROR("creat(%s) failed: %m\n", upperresolvconf);
322 } else {
323 close(fd);
324 }
325 DEBUG("mount -t overlay %s %s (%s)\n", jail_root, jail_root, optsstr);
326
327 if (mount(jail_root, jail_root, "overlay", MS_NOATIME, optsstr))
328 goto upper_resolvconf_printf;
329
330 ret = 0;
331
332 upper_resolvconf_printf:
333 free(upperresolvconf);
334 upper_etc_printf:
335 free(upperetc);
336 opts_printf:
337 free(optsstr);
338 work_printf:
339 free(workdir);
340 upper_printf:
341 free(upperdir);
342 out:
343 return ret;
344 }
345
346 static void pass_console(int console_fd)
347 {
348 struct ubus_context *child_ctx = ubus_connect(NULL);
349 static struct blob_buf req;
350 uint32_t id;
351
352 if (!child_ctx)
353 return;
354
355 blob_buf_init(&req, 0);
356 blobmsg_add_string(&req, "name", opts.name);
357
358 if (ubus_lookup_id(child_ctx, "container", &id) ||
359 ubus_invoke_fd(child_ctx, id, "console_set", req.head, NULL, NULL, 3000, console_fd))
360 INFO("ubus request failed\n");
361 else
362 close(console_fd);
363
364 blob_buf_free(&req);
365 ubus_free(child_ctx);
366 }
367
368 static int create_dev_console(const char *jail_root)
369 {
370 char *console_fname;
371 char dev_console_path[PATH_MAX];
372 int slave_console_fd;
373
374 /* Open UNIX/98 virtual console */
375 console_fd = posix_openpt(O_RDWR | O_NOCTTY);
376 if (console_fd < 0)
377 return -1;
378
379 console_fname = ptsname(console_fd);
380 DEBUG("got console fd %d and PTS client name %s\n", console_fd, console_fname);
381 if (!console_fname)
382 goto no_console;
383
384 grantpt(console_fd);
385 unlockpt(console_fd);
386
387 /* pass PTY master to procd */
388 pass_console(console_fd);
389
390 /* mount-bind PTY slave to /dev/console in jail */
391 snprintf(dev_console_path, sizeof(dev_console_path), "%s/dev/console", jail_root);
392 close(creat(dev_console_path, 0620));
393
394 if (mount(console_fname, dev_console_path, "bind", MS_BIND, NULL))
395 goto no_console;
396
397 /* use PTY slave for stdio */
398 slave_console_fd = open(console_fname, O_RDWR); /* | O_NOCTTY */
399 if (slave_console_fd < 0)
400 goto no_console;
401
402 dup2(slave_console_fd, 0);
403 dup2(slave_console_fd, 1);
404 dup2(slave_console_fd, 2);
405 close(slave_console_fd);
406
407 INFO("using guest console %s\n", console_fname);
408
409 return 0;
410
411 no_console:
412 close(console_fd);
413 return 1;
414 }
415
416 static int hook_running = 0;
417 static int hook_return_code = 0;
418 static struct hook_execvpe **current_hook = NULL;
419 typedef void (*hook_return_handler)(void);
420 static hook_return_handler hook_return_cb = NULL;
421
422 static void hook_process_timeout_cb(struct uloop_timeout *t);
423 static struct uloop_timeout hook_process_timeout = {
424 .cb = hook_process_timeout_cb,
425 };
426
427 static void run_hooklist(void);
428 static void hook_process_handler(struct uloop_process *c, int ret)
429 {
430 uloop_timeout_cancel(&hook_process_timeout);
431
432 if (WIFEXITED(ret)) {
433 hook_return_code = WEXITSTATUS(ret);
434 if (hook_return_code)
435 ERROR("hook (%d) exited with exit: %d\n", c->pid, hook_return_code);
436 else
437 DEBUG("hook (%d) exited with exit: %d\n", c->pid, hook_return_code);
438
439 } else {
440 hook_return_code = WTERMSIG(ret);
441 ERROR("hook (%d) exited with signal: %d\n", c->pid, hook_return_code);
442 }
443 hook_running = 0;
444 ++current_hook;
445 run_hooklist();
446 }
447
448 static struct uloop_process hook_process = {
449 .cb = hook_process_handler,
450 };
451
452 static void hook_process_timeout_cb(struct uloop_timeout *t)
453 {
454 DEBUG("hook process failed to stop, sending SIGKILL\n");
455 kill(hook_process.pid, SIGKILL);
456 }
457
458 static void run_hooklist(void)
459 {
460 struct hook_execvpe *hook = *current_hook;
461 struct stat s;
462
463 if (!hook)
464 return hook_return_cb();
465
466 DEBUG("executing hook %s\n", hook->file);
467
468 if (stat(hook->file, &s))
469 hook_process_handler(&hook_process, ENOENT);
470
471 if (!((unsigned long)s.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
472 hook_process_handler(&hook_process, EPERM);
473
474 hook_running = 1;
475 hook_process.pid = fork();
476 if (hook_process.pid == 0) {
477 /* child */
478 execve(hook->file, hook->argv, hook->envp);
479 ERROR("execve error %m\n");
480 _exit(errno);
481 } else if (hook_process.pid < 0) {
482 /* fork error */
483 ERROR("hook fork error\n");
484 hook_running = 0;
485 hook_process_handler(&hook_process, errno);
486 }
487
488 /* parent */
489 uloop_process_add(&hook_process);
490
491 if (hook->timeout > 0)
492 uloop_timeout_set(&hook_process_timeout, 1000 * hook->timeout);
493
494 uloop_run();
495 if (hook_running) {
496 DEBUG("uloop interrupted, killing jail process\n");
497 kill(hook_process.pid, SIGTERM);
498 uloop_timeout_set(&hook_process_timeout, 1000);
499 uloop_run();
500 }
501 }
502
503 static void run_hooks(struct hook_execvpe **hooklist, hook_return_handler return_cb)
504 {
505 if (!hooklist)
506 return_cb();
507
508 current_hook = hooklist;
509 hook_return_cb = return_cb;
510
511 run_hooklist();
512 }
513
514 static int apply_sysctl(const char *jail_root)
515 {
516 struct sysctl_val **cur;
517 char *procdir, *fname;
518 int f;
519
520 if (!opts.sysctl)
521 return 0;
522
523 if (asprintf(&procdir, "%s/proc", jail_root) < 0)
524 return ENOMEM;
525
526 mkdir(procdir, 0700);
527 if (mount("proc", procdir, "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0))
528 return EPERM;
529
530 cur = opts.sysctl;
531
532 while (*cur) {
533 if (asprintf(&fname, "%s/sys/%s", procdir, (*cur)->entry) < 0)
534 return ENOMEM;
535
536 DEBUG("sysctl: writing '%s' to %s\n", (*cur)->value, fname);
537
538 f = open(fname, O_WRONLY);
539 if (f < 0) {
540 ERROR("sysctl: can't open %s\n", fname);
541 free(fname);
542 return errno;
543 }
544 if (write(f, (*cur)->value, strlen((*cur)->value)) < 0) {
545 ERROR("sysctl: write to %s\n", fname);
546 free(fname);
547 close(f);
548 return errno;
549 }
550
551 free(fname);
552 close(f);
553 ++cur;
554 }
555 umount(procdir);
556 rmdir(procdir);
557 free(procdir);
558
559 return 0;
560 }
561
562 /* glibc defines makedev calling a function. make sure it's a pure macro */
563 #if defined(__GLIBC__)
564 #undef makedev
565 /* from musl's sys/sysmacros.h */
566 #define makedev(x,y) ( \
567 (((x)&0xfffff000ULL) << 32) | \
568 (((x)&0x00000fffULL) << 8) | \
569 (((y)&0xffffff00ULL) << 12) | \
570 (((y)&0x000000ffULL)) )
571 #endif
572
573 static struct mknod_args default_devices[] = {
574 { .path = "/dev/null", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 3) },
575 { .path = "/dev/zero", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 5) },
576 { .path = "/dev/full", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 7) },
577 { .path = "/dev/random", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 8) },
578 { .path = "/dev/urandom", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 9) },
579 { .path = "/dev/tty", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP), .dev = makedev(5, 0), .gid = 5 },
580 { 0 },
581 };
582
583 static int create_devices(void)
584 {
585 struct mknod_args **cur, *curdef;
586 char *path, *tmp;
587
588 if (!opts.devices)
589 goto only_default_devices;
590
591 cur = opts.devices;
592
593 while (*cur) {
594 path = (*cur)->path;
595 /* don't allow devices outside of /dev */
596 if (strncmp(path, "/dev", 4))
597 return EPERM;
598
599 /* make sure parent folder exists */
600 tmp = strrchr(path, '/');
601 if (!tmp)
602 return EINVAL;
603
604 *tmp = '\0';
605 if (strcmp(path, "/dev")) {
606 DEBUG("creating directory %s\n", path);
607
608 mkdir_p(path, 0755);
609 }
610 *tmp = '/';
611
612 DEBUG("creating %s (mode=%08o)\n", path, (*cur)->mode);
613
614 /* create device */
615 if (mknod(path, (*cur)->mode, (*cur)->dev))
616 return errno;
617
618 /* change owner, if needed */
619 if (((*cur)->uid || (*cur)->gid) &&
620 chown(path, (*cur)->uid, (*cur)->gid))
621 return errno;
622
623 ++cur;
624 }
625
626 only_default_devices:
627 curdef = default_devices;
628 while(curdef->path) {
629 DEBUG("creating %s (mode=%08o)\n", curdef->path, curdef->mode);
630 if (mknod(curdef->path, curdef->mode, curdef->dev)) {
631 ++curdef;
632 continue; /* may already exist, eg. due to a bind-mount */
633 }
634 if ((curdef->uid || curdef->gid) &&
635 chown(curdef->path, curdef->uid, curdef->gid))
636 return errno;
637
638 ++curdef;
639 }
640
641 /* Dev symbolic links as defined in OCI spec */
642 (void) symlink("/dev/pts/ptmx", "/dev/ptmx");
643 (void) symlink("/proc/self/fd", "/dev/fd");
644 (void) symlink("/proc/self/fd/0", "/dev/stdin");
645 (void) symlink("/proc/self/fd/1", "/dev/stdout");
646 (void) symlink("/proc/self/fd/2", "/dev/stderr");
647
648 return 0;
649 }
650
651 static char jail_root[] = "/tmp/ujail-XXXXXX";
652 static char tmpovdir[] = "/tmp/ujail-overlay-XXXXXX";
653 static mode_t old_umask;
654 static void enter_jail_fs(void);
655 static int build_jail_fs(void)
656 {
657 char *overlaydir = NULL;
658 int ret;
659
660 old_umask = umask(0);
661
662 if (mkdtemp(jail_root) == NULL) {
663 ERROR("mkdtemp(%s) failed: %m\n", jail_root);
664 return -1;
665 }
666
667 if (apply_sysctl(jail_root)) {
668 ERROR("failed to apply sysctl values\n");
669 return -1;
670 }
671
672 /* oldroot can't be MS_SHARED else pivot_root() fails */
673 if (mount("none", "/", "none", MS_REC|MS_PRIVATE, NULL)) {
674 ERROR("private mount failed %m\n");
675 return -1;
676 }
677
678 if (opts.extroot) {
679 if (mount(opts.extroot, jail_root, "bind", MS_BIND, NULL)) {
680 ERROR("extroot mount failed %m\n");
681 return -1;
682 }
683 } else {
684 if (mount("tmpfs", jail_root, "tmpfs", MS_NOATIME, "mode=0755")) {
685 ERROR("tmpfs mount failed %m\n");
686 return -1;
687 }
688 }
689
690 if (opts.tmpoverlaysize) {
691 char mountoptsstr[] = "mode=0755,size=XXXXXXXX";
692
693 snprintf(mountoptsstr, sizeof(mountoptsstr),
694 "mode=0755,size=%s", opts.tmpoverlaysize);
695 if (mkdtemp(tmpovdir) == NULL) {
696 ERROR("mkdtemp(%s) failed: %m\n", jail_root);
697 return -1;
698 }
699 if (mount("tmpfs", tmpovdir, "tmpfs", MS_NOATIME,
700 mountoptsstr)) {
701 ERROR("failed to mount tmpfs for overlay (size=%s)\n", opts.tmpoverlaysize);
702 return -1;
703 }
704 overlaydir = tmpovdir;
705 }
706
707 if (opts.overlaydir)
708 overlaydir = opts.overlaydir;
709
710 if (overlaydir) {
711 ret = mount_overlay(jail_root, overlaydir);
712 if (ret)
713 return ret;
714 }
715
716 if (chdir(jail_root)) {
717 ERROR("chdir(%s) (jail_root) failed: %m\n", jail_root);
718 return -1;
719 }
720
721 if (mount_all(jail_root)) {
722 ERROR("mount_all() failed\n");
723 return -1;
724 }
725
726 if (opts.console)
727 create_dev_console(jail_root);
728
729 /* make sure /etc/resolv.conf exists if in new network namespace */
730 if (opts.namespace & CLONE_NEWNET) {
731 char jailetc[PATH_MAX], jaillink[PATH_MAX];
732
733 snprintf(jailetc, PATH_MAX, "%s/etc", jail_root);
734 mkdir_p(jailetc, 0755);
735 snprintf(jaillink, PATH_MAX, "%s/etc/resolv.conf", jail_root);
736 if (overlaydir)
737 unlink(jaillink);
738
739 (void) symlink("../dev/resolv.conf.d/resolv.conf.auto", jaillink);
740 }
741
742 run_hooks(opts.hooks.createContainer, enter_jail_fs);
743
744 return 0;
745 }
746
747 static bool exit_from_child;
748 static void free_and_exit(int ret)
749 {
750 if (!exit_from_child && opts.ocibundle)
751 cgroups_free();
752
753 if (!exit_from_child && parent_ctx)
754 ubus_free(parent_ctx);
755
756 free_opts(!exit_from_child);
757
758 exit(ret);
759 }
760
761 static void post_jail_fs(void);
762 static void enter_jail_fs(void)
763 {
764 char dirbuf[sizeof(jail_root) + 4];
765
766 snprintf(dirbuf, sizeof(dirbuf), "%s/old", jail_root);
767 mkdir(dirbuf, 0755);
768
769 if (pivot_root(jail_root, dirbuf) == -1) {
770 ERROR("pivot_root(%s, %s) failed: %m\n", jail_root, dirbuf);
771 free_and_exit(-1);
772 }
773 if (chdir("/")) {
774 ERROR("chdir(/) (after pivot_root) failed: %m\n");
775 free_and_exit(-1);
776 }
777
778 snprintf(dirbuf, sizeof(dirbuf), "/old%s", jail_root);
779 umount2(dirbuf, MNT_DETACH);
780 rmdir(dirbuf);
781 if (opts.tmpoverlaysize) {
782 char tmpdirbuf[sizeof(tmpovdir) + 4];
783 snprintf(tmpdirbuf, sizeof(tmpdirbuf), "/old%s", tmpovdir);
784 umount2(tmpdirbuf, MNT_DETACH);
785 rmdir(tmpdirbuf);
786 }
787
788 umount2("/old", MNT_DETACH);
789 rmdir("/old");
790
791 if (create_devices()) {
792 ERROR("create_devices() failed\n");
793 free_and_exit(-1);
794 }
795 if (opts.ronly)
796 mount(NULL, "/", "bind", MS_REMOUNT | MS_BIND | MS_RDONLY, 0);
797
798 umask(old_umask);
799 post_jail_fs();
800 }
801
802 static int write_uid_gid_map(pid_t child_pid, bool gidmap, char *mapstr)
803 {
804 int map_file;
805 char map_path[64];
806
807 if (snprintf(map_path, sizeof(map_path), "/proc/%d/%s",
808 child_pid, gidmap?"gid_map":"uid_map") < 0)
809 return -1;
810
811 if ((map_file = open(map_path, O_WRONLY)) < 0)
812 return -1;
813
814 if (dprintf(map_file, "%s", mapstr)) {
815 close(map_file);
816 return -1;
817 }
818
819 close(map_file);
820 return 0;
821 }
822
823 static int write_single_uid_gid_map(pid_t child_pid, bool gidmap, int id)
824 {
825 int map_file;
826 char map_path[64];
827 const char *map_format = "%d %d %d\n";
828 if (snprintf(map_path, sizeof(map_path), "/proc/%d/%s",
829 child_pid, gidmap?"gid_map":"uid_map") < 0)
830 return -1;
831
832 if ((map_file = open(map_path, O_WRONLY)) < 0)
833 return -1;
834
835 if (dprintf(map_file, map_format, 0, id, 1) < 0) {
836 close(map_file);
837 return -1;
838 }
839
840 close(map_file);
841 return 0;
842 }
843
844 static int write_setgroups(pid_t child_pid, bool allow)
845 {
846 int setgroups_file;
847 char setgroups_path[64];
848
849 if (snprintf(setgroups_path, sizeof(setgroups_path), "/proc/%d/setgroups",
850 child_pid) < 0) {
851 return -1;
852 }
853
854 if ((setgroups_file = open(setgroups_path, O_WRONLY)) < 0) {
855 return -1;
856 }
857
858 if (dprintf(setgroups_file, "%s", allow?"allow":"deny") == -1) {
859 close(setgroups_file);
860 return -1;
861 }
862
863 close(setgroups_file);
864 return 0;
865 }
866
867 static void get_jail_user(int *user, int *user_gid, int *gr_gid)
868 {
869 struct passwd *p = NULL;
870 struct group *g = NULL;
871
872 if (opts.user) {
873 p = getpwnam(opts.user);
874 if (!p) {
875 ERROR("failed to get uid/gid for user %s: %d (%s)\n",
876 opts.user, errno, strerror(errno));
877 free_and_exit(EXIT_FAILURE);
878 }
879 *user = p->pw_uid;
880 *user_gid = p->pw_gid;
881 } else {
882 *user = -1;
883 *user_gid = -1;
884 }
885
886 if (opts.group) {
887 g = getgrnam(opts.group);
888 if (!g) {
889 ERROR("failed to get gid for group %s: %m\n", opts.group);
890 free_and_exit(EXIT_FAILURE);
891 }
892 *gr_gid = g->gr_gid;
893 } else {
894 *gr_gid = -1;
895 }
896 };
897
898 static void set_jail_user(int pw_uid, int user_gid, int gr_gid)
899 {
900 if (opts.user && (user_gid != -1) && initgroups(opts.user, user_gid)) {
901 ERROR("failed to initgroups() for user %s: %m\n", opts.user);
902 free_and_exit(EXIT_FAILURE);
903 }
904
905 if ((gr_gid != -1) && setregid(gr_gid, gr_gid)) {
906 ERROR("failed to set group id %d: %m\n", gr_gid);
907 free_and_exit(EXIT_FAILURE);
908 }
909
910 if ((pw_uid != -1) && setreuid(pw_uid, pw_uid)) {
911 ERROR("failed to set user id %d: %m\n", pw_uid);
912 free_and_exit(EXIT_FAILURE);
913 }
914 }
915
916 static int apply_rlimits(void)
917 {
918 int resource;
919
920 for (resource = 0; resource < RLIM_NLIMITS; ++resource) {
921 if (opts.rlimits[resource])
922 DEBUG("applying limits to resource %u\n", resource);
923
924 if (opts.rlimits[resource] &&
925 setrlimit(resource, opts.rlimits[resource]))
926 return errno;
927 }
928
929 return 0;
930 }
931
932 #define MAX_ENVP 64
933 static char** build_envp(const char *seccomp, char **ocienvp)
934 {
935 static char *envp[MAX_ENVP];
936 static char preload_var[PATH_MAX];
937 static char seccomp_var[PATH_MAX];
938 static char seccomp_debug_var[20];
939 static char debug_var[] = "LD_DEBUG=all";
940 static char container_var[] = "container=ujail";
941 const char *preload_lib = find_lib("libpreload-seccomp.so");
942 char **addenv;
943
944 int count = 0;
945
946 if (seccomp && !preload_lib) {
947 ERROR("failed to add preload-lib to env\n");
948 return NULL;
949 }
950 if (seccomp) {
951 snprintf(seccomp_var, sizeof(seccomp_var), "SECCOMP_FILE=%s", seccomp);
952 envp[count++] = seccomp_var;
953 snprintf(seccomp_debug_var, sizeof(seccomp_debug_var), "SECCOMP_DEBUG=%2d", debug);
954 envp[count++] = seccomp_debug_var;
955 snprintf(preload_var, sizeof(preload_var), "LD_PRELOAD=%s", preload_lib);
956 envp[count++] = preload_var;
957 }
958
959 envp[count++] = container_var;
960
961 if (debug > 1)
962 envp[count++] = debug_var;
963
964 addenv = ocienvp;
965 while (addenv && *addenv) {
966 envp[count++] = *(addenv++);
967 if (count >= MAX_ENVP) {
968 ERROR("environment limited to %d extra records, truncating\n", MAX_ENVP);
969 break;
970 }
971 }
972 return envp;
973 }
974
975 static void usage(void)
976 {
977 fprintf(stderr, "ujail <options> -- <binary> <params ...>\n");
978 fprintf(stderr, " -d <num>\tshow debug log (increase num to increase verbosity)\n");
979 fprintf(stderr, " -S <file>\tseccomp filter config\n");
980 fprintf(stderr, " -C <file>\tcapabilities drop config\n");
981 fprintf(stderr, " -c\t\tset PR_SET_NO_NEW_PRIVS\n");
982 fprintf(stderr, " -n <name>\tthe name of the jail\n");
983 fprintf(stderr, "namespace jail options:\n");
984 fprintf(stderr, " -h <hostname>\tchange the hostname of the jail\n");
985 fprintf(stderr, " -N\t\tjail has network namespace\n");
986 fprintf(stderr, " -f\t\tjail has user namespace\n");
987 fprintf(stderr, " -F\t\tjail has cgroups namespace\n");
988 fprintf(stderr, " -r <file>\treadonly files that should be staged\n");
989 fprintf(stderr, " -w <file>\twriteable files that should be staged\n");
990 fprintf(stderr, " -p\t\tjail has /proc\n");
991 fprintf(stderr, " -s\t\tjail has /sys\n");
992 fprintf(stderr, " -l\t\tjail has /dev/log\n");
993 fprintf(stderr, " -u\t\tjail has a ubus socket\n");
994 fprintf(stderr, " -U <name>\tuser to run jailed process\n");
995 fprintf(stderr, " -G <name>\tgroup to run jailed process\n");
996 fprintf(stderr, " -o\t\tremont jail root (/) read only\n");
997 fprintf(stderr, " -R <dir>\texternal jail rootfs (system container)\n");
998 fprintf(stderr, " -O <dir>\tdirectory for r/w overlayfs\n");
999 fprintf(stderr, " -T <size>\tuse tmpfs r/w overlayfs with <size>\n");
1000 fprintf(stderr, " -E\t\tfail if jail cannot be setup\n");
1001 fprintf(stderr, " -y\t\tprovide jail console\n");
1002 fprintf(stderr, " -J <dir>\tcreate container from OCI bundle\n");
1003 fprintf(stderr, " -i\t\tstart container immediately\n");
1004 fprintf(stderr, " -P <pidfile>\tcreate <pidfile>\n");
1005 fprintf(stderr, "\nWarning: by default root inside the jail is the same\n\
1006 and he has the same powers as root outside the jail,\n\
1007 thus he can escape the jail and/or break stuff.\n\
1008 Please use seccomp/capabilities (-S/-C) to restrict his powers\n\n\
1009 If you use none of the namespace jail options,\n\
1010 ujail will not use namespace/build a jail,\n\
1011 and will only drop capabilities/apply seccomp filter.\n\n");
1012 }
1013
1014 static int* get_namespace_fd(const unsigned int nstype)
1015 {
1016 switch (nstype) {
1017 case CLONE_NEWPID:
1018 return &opts.setns.pid;
1019 case CLONE_NEWNET:
1020 return &opts.setns.net;
1021 case CLONE_NEWNS:
1022 return &opts.setns.ns;
1023 case CLONE_NEWIPC:
1024 return &opts.setns.ipc;
1025 case CLONE_NEWUTS:
1026 return &opts.setns.uts;
1027 case CLONE_NEWUSER:
1028 return &opts.setns.user;
1029 case CLONE_NEWCGROUP:
1030 return &opts.setns.cgroup;
1031 #ifdef CLONE_NEWTIME
1032 case CLONE_NEWTIME:
1033 return &opts.setns.time;
1034 #endif
1035 default:
1036 return NULL;
1037 }
1038 }
1039
1040 static int setns_open(unsigned long nstype)
1041 {
1042 int *fd = get_namespace_fd(nstype);
1043
1044 assert(fd != NULL);
1045
1046 if (*fd < 0)
1047 return 0;
1048
1049 if (setns(*fd, nstype) == -1) {
1050 close(*fd);
1051 return errno;
1052 }
1053
1054 close(*fd);
1055 return 0;
1056 }
1057
1058 static int jail_running = 0;
1059 static int jail_return_code = 0;
1060
1061 static void jail_process_timeout_cb(struct uloop_timeout *t);
1062 static struct uloop_timeout jail_process_timeout = {
1063 .cb = jail_process_timeout_cb,
1064 };
1065 static void poststop(void);
1066 static void jail_process_handler(struct uloop_process *c, int ret)
1067 {
1068 uloop_timeout_cancel(&jail_process_timeout);
1069 if (WIFEXITED(ret)) {
1070 jail_return_code = WEXITSTATUS(ret);
1071 INFO("jail (%d) exited with exit: %d\n", c->pid, jail_return_code);
1072 } else {
1073 jail_return_code = WTERMSIG(ret);
1074 INFO("jail (%d) exited with signal: %d\n", c->pid, jail_return_code);
1075 }
1076 jail_running = 0;
1077 poststop();
1078 }
1079
1080 static struct uloop_process jail_process = {
1081 .cb = jail_process_handler,
1082 };
1083
1084 static void jail_process_timeout_cb(struct uloop_timeout *t)
1085 {
1086 DEBUG("jail process failed to stop, sending SIGKILL\n");
1087 kill(jail_process.pid, SIGKILL);
1088 }
1089
1090 static void jail_handle_signal(int signo)
1091 {
1092 if (hook_running) {
1093 DEBUG("forwarding signal %d to the hook process\n", signo);
1094 kill(hook_process.pid, signo);
1095 }
1096
1097 if (jail_running) {
1098 DEBUG("forwarding signal %d to the jailed process\n", signo);
1099 kill(jail_process.pid, signo);
1100 }
1101 }
1102
1103 static void signals_init(void)
1104 {
1105 int i;
1106 sigset_t sigmask;
1107
1108 sigfillset(&sigmask);
1109 for (i = 0; i < _NSIG; i++) {
1110 struct sigaction s = { 0 };
1111
1112 if (!sigismember(&sigmask, i))
1113 continue;
1114 if ((i == SIGCHLD) || (i == SIGPIPE) || (i == SIGSEGV))
1115 continue;
1116
1117 s.sa_handler = jail_handle_signal;
1118 sigaction(i, &s, NULL);
1119 }
1120 }
1121
1122 static void pre_exec_jail(struct uloop_timeout *t);
1123 static struct uloop_timeout pre_exec_timeout = {
1124 .cb = pre_exec_jail,
1125 };
1126
1127 int pipes[4];
1128 static int exec_jail(void *arg)
1129 {
1130 char buf[1];
1131
1132 exit_from_child = true;
1133 prctl(PR_SET_SECUREBITS, 0);
1134
1135 uloop_init();
1136 signals_init();
1137
1138 close(pipes[0]);
1139 close(pipes[3]);
1140
1141 setns_open(CLONE_NEWUSER);
1142 setns_open(CLONE_NEWNET);
1143 setns_open(CLONE_NEWNS);
1144 setns_open(CLONE_NEWIPC);
1145 setns_open(CLONE_NEWUTS);
1146
1147 buf[0] = 'i';
1148 if (write(pipes[1], buf, 1) < 1) {
1149 ERROR("can't write to parent\n");
1150 return EXIT_FAILURE;
1151 }
1152 close(pipes[1]);
1153 if (read(pipes[2], buf, 1) < 1) {
1154 ERROR("can't read from parent\n");
1155 return EXIT_FAILURE;
1156 }
1157 if (buf[0] != 'O') {
1158 ERROR("parent had an error, child exiting\n");
1159 return EXIT_FAILURE;
1160 }
1161
1162 if (opts.namespace & CLONE_NEWCGROUP)
1163 unshare(CLONE_NEWCGROUP);
1164
1165 setns_open(CLONE_NEWCGROUP);
1166
1167 if ((opts.namespace & CLONE_NEWUSER) || (opts.setns.user != -1)) {
1168 if (setregid(0, 0) < 0) {
1169 ERROR("setgid\n");
1170 free_and_exit(EXIT_FAILURE);
1171 }
1172 if (setreuid(0, 0) < 0) {
1173 ERROR("setuid\n");
1174 free_and_exit(EXIT_FAILURE);
1175 }
1176 if (setgroups(0, NULL) < 0) {
1177 ERROR("setgroups\n");
1178 free_and_exit(EXIT_FAILURE);
1179 }
1180 }
1181
1182 if (opts.namespace && opts.hostname && strlen(opts.hostname) > 0
1183 && sethostname(opts.hostname, strlen(opts.hostname))) {
1184 ERROR("sethostname(%s) failed: %m\n", opts.hostname);
1185 free_and_exit(EXIT_FAILURE);
1186 }
1187
1188 uloop_timeout_add(&pre_exec_timeout);
1189 uloop_run();
1190
1191 free_and_exit(-1);
1192 return -1;
1193 }
1194
1195 static void pre_exec_jail(struct uloop_timeout *t)
1196 {
1197 if ((opts.namespace & CLONE_NEWNS) && build_jail_fs()) {
1198 ERROR("failed to build jail fs\n");
1199 free_and_exit(EXIT_FAILURE);
1200 } else {
1201 run_hooks(opts.hooks.createContainer, post_jail_fs);
1202 }
1203 }
1204
1205 static void post_start_hook(void);
1206 static void post_jail_fs(void)
1207 {
1208 char buf[1];
1209
1210 if (read(pipes[2], buf, 1) < 1) {
1211 ERROR("can't read from parent\n");
1212 free_and_exit(EXIT_FAILURE);
1213 }
1214 if (buf[0] != '!') {
1215 ERROR("parent had an error, child exiting\n");
1216 free_and_exit(EXIT_FAILURE);
1217 }
1218 close(pipes[2]);
1219
1220 run_hooks(opts.hooks.startContainer, post_start_hook);
1221 }
1222
1223 static void post_start_hook(void)
1224 {
1225 int pw_uid, pw_gid, gr_gid;
1226
1227 /*
1228 * make sure setuid/setgid won't drop capabilities in case capabilities
1229 * have been specified explicitely.
1230 */
1231 if (opts.capset.apply) {
1232 if (prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP)) {
1233 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
1234 free_and_exit(EXIT_FAILURE);
1235 }
1236 }
1237
1238 /* drop capabilities, retain those still needed to further setup jail */
1239 if (applyOCIcapabilities(opts.capset, (1LLU << CAP_SETGID) | (1LLU << CAP_SETUID) | (1LLU << CAP_SETPCAP)))
1240 free_and_exit(EXIT_FAILURE);
1241
1242 /* use either cmdline-supplied user/group or uid/gid from OCI spec */
1243 get_jail_user(&pw_uid, &pw_gid, &gr_gid);
1244 set_jail_user(opts.pw_uid?:pw_uid, opts.pw_gid?:pw_gid, opts.gr_gid?:gr_gid);
1245
1246 if (opts.additional_gids &&
1247 (setgroups(opts.num_additional_gids, opts.additional_gids) < 0)) {
1248 ERROR("setgroups failed: %m\n");
1249 free_and_exit(EXIT_FAILURE);
1250 }
1251
1252 if (opts.set_umask)
1253 umask(opts.umask);
1254
1255 /* restore securebits back to normal (and lock them if not in userns) */
1256 if (opts.capset.apply) {
1257 if (prctl(PR_SET_SECUREBITS, (opts.namespace & CLONE_NEWUSER)?0:
1258 SECBIT_KEEP_CAPS_LOCKED|SECBIT_NO_SETUID_FIXUP_LOCKED|SECBIT_NOROOT_LOCKED)) {
1259 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
1260 free_and_exit(EXIT_FAILURE);
1261 }
1262 }
1263
1264 /* drop remaining capabilities to end up with specified sets */
1265 if (applyOCIcapabilities(opts.capset, 0))
1266 free_and_exit(EXIT_FAILURE);
1267
1268 if (opts.no_new_privs && prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1269 ERROR("prctl(PR_SET_NO_NEW_PRIVS) failed: %m\n");
1270 free_and_exit(EXIT_FAILURE);
1271 }
1272
1273 char **envp = build_envp(opts.seccomp, opts.envp);
1274 if (!envp)
1275 free_and_exit(EXIT_FAILURE);
1276
1277 if (opts.cwd && chdir(opts.cwd))
1278 free_and_exit(EXIT_FAILURE);
1279
1280 if (opts.ociseccomp && applyOCIlinuxseccomp(opts.ociseccomp))
1281 free_and_exit(EXIT_FAILURE);
1282
1283 uloop_end();
1284 free_opts(false);
1285 INFO("exec-ing %s\n", *opts.jail_argv);
1286 if (opts.envp) /* respect PATH if potentially set in ENV */
1287 execvpe(*opts.jail_argv, opts.jail_argv, envp);
1288 else
1289 execve(*opts.jail_argv, opts.jail_argv, envp);
1290
1291 /* we get there only if execve fails */
1292 ERROR("failed to execve %s: %m\n", *opts.jail_argv);
1293 exit(EXIT_FAILURE);
1294 }
1295
1296 int ns_open_pid(const char *nstype, const pid_t target_ns)
1297 {
1298 char pid_pid_path[PATH_MAX];
1299
1300 snprintf(pid_pid_path, sizeof(pid_pid_path), "/proc/%u/ns/%s", target_ns, nstype);
1301
1302 return open(pid_pid_path, O_RDONLY);
1303 }
1304
1305 static int parseOCIenvarray(struct blob_attr *msg, char ***envp)
1306 {
1307 struct blob_attr *cur;
1308 int sz = 0, rem;
1309
1310 blobmsg_for_each_attr(cur, msg, rem)
1311 ++sz;
1312
1313 if (sz > 0) {
1314 *envp = calloc(1 + sz, sizeof(char*));
1315 if (!(*envp))
1316 return ENOMEM;
1317 } else {
1318 *envp = NULL;
1319 return 0;
1320 }
1321
1322 sz = 0;
1323 blobmsg_for_each_attr(cur, msg, rem)
1324 (*envp)[sz++] = strdup(blobmsg_get_string(cur));
1325
1326 if (sz)
1327 (*envp)[sz] = NULL;
1328
1329 return 0;
1330 }
1331
1332 enum {
1333 OCI_ROOT_PATH,
1334 OCI_ROOT_READONLY,
1335 __OCI_ROOT_MAX,
1336 };
1337
1338 static const struct blobmsg_policy oci_root_policy[] = {
1339 [OCI_ROOT_PATH] = { "path", BLOBMSG_TYPE_STRING },
1340 [OCI_ROOT_READONLY] = { "readonly", BLOBMSG_TYPE_BOOL },
1341 };
1342
1343 static int parseOCIroot(const char *jsonfile, struct blob_attr *msg)
1344 {
1345 char extroot[PATH_MAX] = { 0 };
1346 struct blob_attr *tb[__OCI_ROOT_MAX];
1347 char *cur;
1348 char *root_path;
1349
1350 blobmsg_parse(oci_root_policy, __OCI_ROOT_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1351
1352 if (!tb[OCI_ROOT_PATH])
1353 return ENODATA;
1354
1355 root_path = blobmsg_get_string(tb[OCI_ROOT_PATH]);
1356
1357 /* prepend bundle directory in case of relative paths */
1358 if (root_path[0] != '/') {
1359 strncpy(extroot, jsonfile, PATH_MAX - 1);
1360
1361 cur = strrchr(extroot, '/');
1362
1363 if (!cur)
1364 return ENOTDIR;
1365
1366 *(++cur) = '\0';
1367 }
1368
1369 strncat(extroot, root_path, PATH_MAX - (strlen(extroot) + 1));
1370
1371 /* follow symbolic link(s) */
1372 opts.extroot = realpath(extroot, NULL);
1373 if (!opts.extroot)
1374 return errno;
1375
1376 if (tb[OCI_ROOT_READONLY])
1377 opts.ronly = blobmsg_get_bool(tb[OCI_ROOT_READONLY]);
1378
1379 return 0;
1380 }
1381
1382
1383 enum {
1384 OCI_HOOK_PATH,
1385 OCI_HOOK_ARGS,
1386 OCI_HOOK_ENV,
1387 OCI_HOOK_TIMEOUT,
1388 __OCI_HOOK_MAX,
1389 };
1390
1391 static const struct blobmsg_policy oci_hook_policy[] = {
1392 [OCI_HOOK_PATH] = { "path", BLOBMSG_TYPE_STRING },
1393 [OCI_HOOK_ARGS] = { "args", BLOBMSG_TYPE_ARRAY },
1394 [OCI_HOOK_ENV] = { "env", BLOBMSG_TYPE_ARRAY },
1395 [OCI_HOOK_TIMEOUT] = { "timeout", BLOBMSG_TYPE_INT32 },
1396 };
1397
1398
1399 static int parseOCIhook(struct hook_execvpe ***hooklist, struct blob_attr *msg)
1400 {
1401 struct blob_attr *tb[__OCI_HOOK_MAX];
1402 struct blob_attr *cur;
1403 int rem, ret = 0;
1404 int idx = 0;
1405
1406 blobmsg_for_each_attr(cur, msg, rem)
1407 ++idx;
1408
1409 if (!idx)
1410 return 0;
1411
1412 *hooklist = calloc(idx + 1, sizeof(struct hook_execvpe *));
1413 idx = 0;
1414
1415 if (!(*hooklist))
1416 return ENOMEM;
1417
1418 blobmsg_for_each_attr(cur, msg, rem) {
1419 blobmsg_parse(oci_hook_policy, __OCI_HOOK_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
1420
1421 if (!tb[OCI_HOOK_PATH]) {
1422 ret = EINVAL;
1423 goto errout;
1424 }
1425
1426 (*hooklist)[idx] = calloc(1, sizeof(struct hook_execvpe));
1427 if (tb[OCI_HOOK_ARGS]) {
1428 ret = parseOCIenvarray(tb[OCI_HOOK_ARGS], &((*hooklist)[idx]->argv));
1429 if (ret)
1430 goto errout;
1431 } else {
1432 (*hooklist)[idx]->argv = calloc(2, sizeof(char *));
1433 ((*hooklist)[idx]->argv)[0] = strdup(blobmsg_get_string(tb[OCI_HOOK_PATH]));
1434 ((*hooklist)[idx]->argv)[1] = NULL;
1435 };
1436
1437
1438 if (tb[OCI_HOOK_ENV]) {
1439 ret = parseOCIenvarray(tb[OCI_HOOK_ENV], &((*hooklist)[idx]->envp));
1440 if (ret)
1441 goto errout;
1442 }
1443
1444 if (tb[OCI_HOOK_TIMEOUT])
1445 (*hooklist)[idx]->timeout = blobmsg_get_u32(tb[OCI_HOOK_TIMEOUT]);
1446
1447 (*hooklist)[idx]->file = strdup(blobmsg_get_string(tb[OCI_HOOK_PATH]));
1448
1449 ++idx;
1450 }
1451
1452 (*hooklist)[idx] = NULL;
1453
1454 DEBUG("added %d hooks\n", idx);
1455
1456 return 0;
1457
1458 errout:
1459 free_hooklist(*hooklist);
1460 *hooklist = NULL;
1461
1462 return ret;
1463 };
1464
1465
1466 enum {
1467 OCI_HOOKS_PRESTART,
1468 OCI_HOOKS_CREATERUNTIME,
1469 OCI_HOOKS_CREATECONTAINER,
1470 OCI_HOOKS_STARTCONTAINER,
1471 OCI_HOOKS_POSTSTART,
1472 OCI_HOOKS_POSTSTOP,
1473 __OCI_HOOKS_MAX,
1474 };
1475
1476 static const struct blobmsg_policy oci_hooks_policy[] = {
1477 [OCI_HOOKS_PRESTART] = { "prestart", BLOBMSG_TYPE_ARRAY },
1478 [OCI_HOOKS_CREATERUNTIME] = { "createRuntime", BLOBMSG_TYPE_ARRAY },
1479 [OCI_HOOKS_CREATECONTAINER] = { "createContainer", BLOBMSG_TYPE_ARRAY },
1480 [OCI_HOOKS_STARTCONTAINER] = { "startContainer", BLOBMSG_TYPE_ARRAY },
1481 [OCI_HOOKS_POSTSTART] = { "poststart", BLOBMSG_TYPE_ARRAY },
1482 [OCI_HOOKS_POSTSTOP] = { "poststop", BLOBMSG_TYPE_ARRAY },
1483 };
1484
1485 static int parseOCIhooks(struct blob_attr *msg)
1486 {
1487 struct blob_attr *tb[__OCI_HOOKS_MAX];
1488 int ret;
1489
1490 blobmsg_parse(oci_hooks_policy, __OCI_HOOKS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1491
1492 if (tb[OCI_HOOKS_PRESTART])
1493 INFO("warning: ignoring deprecated prestart hook\n");
1494
1495 if (tb[OCI_HOOKS_CREATERUNTIME]) {
1496 ret = parseOCIhook(&opts.hooks.createRuntime, tb[OCI_HOOKS_CREATERUNTIME]);
1497 if (ret)
1498 return ret;
1499 }
1500
1501 if (tb[OCI_HOOKS_CREATECONTAINER]) {
1502 ret = parseOCIhook(&opts.hooks.createContainer, tb[OCI_HOOKS_CREATECONTAINER]);
1503 if (ret)
1504 goto out_createruntime;
1505 }
1506
1507 if (tb[OCI_HOOKS_STARTCONTAINER]) {
1508 ret = parseOCIhook(&opts.hooks.startContainer, tb[OCI_HOOKS_STARTCONTAINER]);
1509 if (ret)
1510 goto out_createcontainer;
1511 }
1512
1513 if (tb[OCI_HOOKS_POSTSTART]) {
1514 ret = parseOCIhook(&opts.hooks.poststart, tb[OCI_HOOKS_POSTSTART]);
1515 if (ret)
1516 goto out_startcontainer;
1517 }
1518
1519 if (tb[OCI_HOOKS_POSTSTOP]) {
1520 ret = parseOCIhook(&opts.hooks.poststop, tb[OCI_HOOKS_POSTSTOP]);
1521 if (ret)
1522 goto out_poststart;
1523 }
1524
1525 return 0;
1526
1527 out_poststart:
1528 free_hooklist(opts.hooks.poststart);
1529 out_startcontainer:
1530 free_hooklist(opts.hooks.startContainer);
1531 out_createcontainer:
1532 free_hooklist(opts.hooks.createContainer);
1533 out_createruntime:
1534 free_hooklist(opts.hooks.createRuntime);
1535
1536 return ret;
1537 };
1538
1539
1540 enum {
1541 OCI_PROCESS_USER_UID,
1542 OCI_PROCESS_USER_GID,
1543 OCI_PROCESS_USER_UMASK,
1544 OCI_PROCESS_USER_ADDITIONALGIDS,
1545 __OCI_PROCESS_USER_MAX,
1546 };
1547
1548 static const struct blobmsg_policy oci_process_user_policy[] = {
1549 [OCI_PROCESS_USER_UID] = { "uid", BLOBMSG_TYPE_INT32 },
1550 [OCI_PROCESS_USER_GID] = { "gid", BLOBMSG_TYPE_INT32 },
1551 [OCI_PROCESS_USER_UMASK] = { "umask", BLOBMSG_TYPE_INT32 },
1552 [OCI_PROCESS_USER_ADDITIONALGIDS] = { "additionalGids", BLOBMSG_TYPE_ARRAY },
1553 };
1554
1555 static int parseOCIprocessuser(struct blob_attr *msg) {
1556 struct blob_attr *tb[__OCI_PROCESS_USER_MAX];
1557 struct blob_attr *cur;
1558 int rem;
1559 int has_gid = 0;
1560
1561 blobmsg_parse(oci_process_user_policy, __OCI_PROCESS_USER_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1562
1563 if (tb[OCI_PROCESS_USER_UID])
1564 opts.pw_uid = blobmsg_get_u32(tb[OCI_PROCESS_USER_UID]);
1565
1566 if (tb[OCI_PROCESS_USER_GID]) {
1567 opts.pw_gid = blobmsg_get_u32(tb[OCI_PROCESS_USER_GID]);
1568 opts.gr_gid = blobmsg_get_u32(tb[OCI_PROCESS_USER_GID]);
1569 has_gid = 1;
1570 }
1571
1572 if (tb[OCI_PROCESS_USER_ADDITIONALGIDS]) {
1573 size_t gidcnt = 0;
1574
1575 blobmsg_for_each_attr(cur, tb[OCI_PROCESS_USER_ADDITIONALGIDS], rem) {
1576 ++gidcnt;
1577 if (has_gid && (blobmsg_get_u32(cur) == opts.gr_gid))
1578 continue;
1579 }
1580
1581 if (gidcnt) {
1582 opts.additional_gids = calloc(gidcnt + has_gid, sizeof(gid_t));
1583 gidcnt = 0;
1584
1585 /* always add primary GID to set of GIDs if set */
1586 if (has_gid)
1587 opts.additional_gids[gidcnt++] = opts.gr_gid;
1588
1589 blobmsg_for_each_attr(cur, tb[OCI_PROCESS_USER_ADDITIONALGIDS], rem) {
1590 if (has_gid && (blobmsg_get_u32(cur) == opts.gr_gid))
1591 continue;
1592 opts.additional_gids[gidcnt++] = blobmsg_get_u32(cur);
1593 }
1594 opts.num_additional_gids = gidcnt;
1595 }
1596 DEBUG("read %zu additional groups\n", gidcnt);
1597 }
1598
1599 if (tb[OCI_PROCESS_USER_UMASK]) {
1600 opts.umask = blobmsg_get_u32(tb[OCI_PROCESS_USER_UMASK]);
1601 opts.set_umask = true;
1602 }
1603
1604 return 0;
1605 }
1606
1607 enum {
1608 OCI_PROCESS_RLIMIT_TYPE,
1609 OCI_PROCESS_RLIMIT_SOFT,
1610 OCI_PROCESS_RLIMIT_HARD,
1611 __OCI_PROCESS_RLIMIT_MAX,
1612 };
1613
1614 static const struct blobmsg_policy oci_process_rlimit_policy[] = {
1615 [OCI_PROCESS_RLIMIT_TYPE] = { "type", BLOBMSG_TYPE_STRING },
1616 [OCI_PROCESS_RLIMIT_SOFT] = { "soft", BLOBMSG_CAST_INT64 },
1617 [OCI_PROCESS_RLIMIT_HARD] = { "hard", BLOBMSG_CAST_INT64 },
1618 };
1619
1620 /* from manpage GETRLIMIT(2) */
1621 static const char* const rlimit_names[RLIM_NLIMITS] = {
1622 [RLIMIT_AS] = "AS",
1623 [RLIMIT_CORE] = "CORE",
1624 [RLIMIT_CPU] = "CPU",
1625 [RLIMIT_DATA] = "DATA",
1626 [RLIMIT_FSIZE] = "FSIZE",
1627 [RLIMIT_LOCKS] = "LOCKS",
1628 [RLIMIT_MEMLOCK] = "MEMLOCK",
1629 [RLIMIT_MSGQUEUE] = "MSGQUEUE",
1630 [RLIMIT_NICE] = "NICE",
1631 [RLIMIT_NOFILE] = "NOFILE",
1632 [RLIMIT_NPROC] = "NPROC",
1633 [RLIMIT_RSS] = "RSS",
1634 [RLIMIT_RTPRIO] = "RTPRIO",
1635 [RLIMIT_RTTIME] = "RTTIME",
1636 [RLIMIT_SIGPENDING] = "SIGPENDING",
1637 [RLIMIT_STACK] = "STACK",
1638 };
1639
1640 static int resolve_rlimit(char *type) {
1641 unsigned int rltype;
1642
1643 for (rltype = 0; rltype < RLIM_NLIMITS; ++rltype)
1644 if (rlimit_names[rltype] &&
1645 !strncmp("RLIMIT_", type, 7) &&
1646 !strcmp(rlimit_names[rltype], type + 7))
1647 return rltype;
1648
1649 return -1;
1650 }
1651
1652
1653 static int parseOCIrlimit(struct blob_attr *msg)
1654 {
1655 struct blob_attr *tb[__OCI_PROCESS_RLIMIT_MAX];
1656 int limtype = -1;
1657 struct rlimit *curlim;
1658
1659 blobmsg_parse(oci_process_rlimit_policy, __OCI_PROCESS_RLIMIT_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1660
1661 if (!tb[OCI_PROCESS_RLIMIT_TYPE] ||
1662 !tb[OCI_PROCESS_RLIMIT_SOFT] ||
1663 !tb[OCI_PROCESS_RLIMIT_HARD])
1664 return ENODATA;
1665
1666 limtype = resolve_rlimit(blobmsg_get_string(tb[OCI_PROCESS_RLIMIT_TYPE]));
1667
1668 if (limtype < 0)
1669 return EINVAL;
1670
1671 if (opts.rlimits[limtype])
1672 return ENOTUNIQ;
1673
1674 curlim = malloc(sizeof(struct rlimit));
1675 curlim->rlim_cur = blobmsg_cast_u64(tb[OCI_PROCESS_RLIMIT_SOFT]);
1676 curlim->rlim_max = blobmsg_cast_u64(tb[OCI_PROCESS_RLIMIT_HARD]);
1677
1678 opts.rlimits[limtype] = curlim;
1679
1680 return 0;
1681 };
1682
1683 enum {
1684 OCI_PROCESS_ARGS,
1685 OCI_PROCESS_CAPABILITIES,
1686 OCI_PROCESS_CWD,
1687 OCI_PROCESS_ENV,
1688 OCI_PROCESS_OOMSCOREADJ,
1689 OCI_PROCESS_NONEWPRIVILEGES,
1690 OCI_PROCESS_RLIMITS,
1691 OCI_PROCESS_TERMINAL,
1692 OCI_PROCESS_USER,
1693 __OCI_PROCESS_MAX,
1694 };
1695
1696 static const struct blobmsg_policy oci_process_policy[] = {
1697 [OCI_PROCESS_ARGS] = { "args", BLOBMSG_TYPE_ARRAY },
1698 [OCI_PROCESS_CAPABILITIES] = { "capabilities", BLOBMSG_TYPE_TABLE },
1699 [OCI_PROCESS_CWD] = { "cwd", BLOBMSG_TYPE_STRING },
1700 [OCI_PROCESS_ENV] = { "env", BLOBMSG_TYPE_ARRAY },
1701 [OCI_PROCESS_OOMSCOREADJ] = { "oomScoreAdj", BLOBMSG_TYPE_INT32 },
1702 [OCI_PROCESS_NONEWPRIVILEGES] = { "noNewPrivileges", BLOBMSG_TYPE_BOOL },
1703 [OCI_PROCESS_RLIMITS] = { "rlimits", BLOBMSG_TYPE_ARRAY },
1704 [OCI_PROCESS_TERMINAL] = { "terminal", BLOBMSG_TYPE_BOOL },
1705 [OCI_PROCESS_USER] = { "user", BLOBMSG_TYPE_TABLE },
1706 };
1707
1708
1709 static int parseOCIprocess(struct blob_attr *msg)
1710 {
1711 struct blob_attr *tb[__OCI_PROCESS_MAX], *cur;
1712 int rem, res;
1713
1714 blobmsg_parse(oci_process_policy, __OCI_PROCESS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1715
1716 if (!tb[OCI_PROCESS_ARGS])
1717 return ENOENT;
1718
1719 res = parseOCIenvarray(tb[OCI_PROCESS_ARGS], &opts.jail_argv);
1720 if (res)
1721 return res;
1722
1723 if (tb[OCI_PROCESS_TERMINAL])
1724 opts.console = blobmsg_get_bool(tb[OCI_PROCESS_TERMINAL]);
1725
1726 if (tb[OCI_PROCESS_NONEWPRIVILEGES])
1727 opts.no_new_privs = blobmsg_get_bool(tb[OCI_PROCESS_NONEWPRIVILEGES]);
1728
1729 if (tb[OCI_PROCESS_CWD])
1730 opts.cwd = strdup(blobmsg_get_string(tb[OCI_PROCESS_CWD]));
1731
1732 if (tb[OCI_PROCESS_ENV]) {
1733 res = parseOCIenvarray(tb[OCI_PROCESS_ENV], &opts.envp);
1734 if (res)
1735 return res;
1736 }
1737
1738 if (tb[OCI_PROCESS_USER] && (res = parseOCIprocessuser(tb[OCI_PROCESS_USER])))
1739 return res;
1740
1741 if (tb[OCI_PROCESS_CAPABILITIES] &&
1742 (res = parseOCIcapabilities(&opts.capset, tb[OCI_PROCESS_CAPABILITIES])))
1743 return res;
1744
1745 if (tb[OCI_PROCESS_RLIMITS]) {
1746 blobmsg_for_each_attr(cur, tb[OCI_PROCESS_RLIMITS], rem) {
1747 res = parseOCIrlimit(cur);
1748 if (res)
1749 return res;
1750 }
1751 }
1752
1753 if (tb[OCI_PROCESS_OOMSCOREADJ]) {
1754 opts.oom_score_adj = blobmsg_get_u32(tb[OCI_PROCESS_OOMSCOREADJ]);
1755 opts.set_oom_score_adj = true;
1756 }
1757
1758 return 0;
1759 }
1760
1761 enum {
1762 OCI_LINUX_NAMESPACE_TYPE,
1763 OCI_LINUX_NAMESPACE_PATH,
1764 __OCI_LINUX_NAMESPACE_MAX,
1765 };
1766
1767 static const struct blobmsg_policy oci_linux_namespace_policy[] = {
1768 [OCI_LINUX_NAMESPACE_TYPE] = { "type", BLOBMSG_TYPE_STRING },
1769 [OCI_LINUX_NAMESPACE_PATH] = { "path", BLOBMSG_TYPE_STRING },
1770 };
1771
1772 static int resolve_nstype(char *type) {
1773 if (!strcmp("pid", type))
1774 return CLONE_NEWPID;
1775 else if (!strcmp("network", type))
1776 return CLONE_NEWNET;
1777 else if (!strcmp("net", type))
1778 return CLONE_NEWNET;
1779 else if (!strcmp("mount", type))
1780 return CLONE_NEWNS;
1781 else if (!strcmp("ipc", type))
1782 return CLONE_NEWIPC;
1783 else if (!strcmp("uts", type))
1784 return CLONE_NEWUTS;
1785 else if (!strcmp("user", type))
1786 return CLONE_NEWUSER;
1787 else if (!strcmp("cgroup", type))
1788 return CLONE_NEWCGROUP;
1789 #ifdef CLONE_NEWTIME
1790 else if (!strcmp("time", type))
1791 return CLONE_NEWTIME;
1792 #endif
1793 else
1794 return 0;
1795 }
1796
1797 static int parseOCIlinuxns(struct blob_attr *msg)
1798 {
1799 struct blob_attr *tb[__OCI_LINUX_NAMESPACE_MAX];
1800 int nstype;
1801 int *setns;
1802 int fd;
1803
1804 blobmsg_parse(oci_linux_namespace_policy, __OCI_LINUX_NAMESPACE_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
1805
1806 if (!tb[OCI_LINUX_NAMESPACE_TYPE])
1807 return EINVAL;
1808
1809 nstype = resolve_nstype(blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]));
1810 if (!nstype)
1811 return EINVAL;
1812
1813 if (opts.namespace & nstype)
1814 return ENOTUNIQ;
1815
1816 setns = get_namespace_fd(nstype);
1817
1818 if (!setns)
1819 return EFAULT;
1820
1821 if (*setns != -1)
1822 return ENOTUNIQ;
1823
1824 if (tb[OCI_LINUX_NAMESPACE_PATH]) {
1825 DEBUG("opening existing %s namespace from path %s\n",
1826 blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]),
1827 blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_PATH]));
1828
1829 fd = open(blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_PATH]), O_RDONLY);
1830 if (fd < 0)
1831 return errno?:ESTALE;
1832
1833 if (ioctl(fd, NS_GET_NSTYPE) != nstype) {
1834 close(fd);
1835 return EINVAL;
1836 }
1837
1838 DEBUG("opened existing %s namespace got filehandler %u\n",
1839 blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]),
1840 fd);
1841
1842 *setns = fd;
1843 } else {
1844 opts.namespace |= nstype;
1845 }
1846
1847 return 0;
1848 }
1849
1850 /*
1851 * join namespace of existing PID
1852 * The string argument is the reference PID followed by ':' and a
1853 * ',' separated list of namespaces to to join.
1854 */
1855 static int jail_join_ns(char *arg)
1856 {
1857 pid_t pid;
1858 int fd;
1859 int nstype;
1860 char *tmp, *etmp, *nspath;
1861 int *setns;
1862
1863 tmp = strchr(arg, ':');
1864 if (!tmp)
1865 return EINVAL;
1866
1867 *tmp = '\0';
1868 pid = atoi(arg);
1869
1870 do {
1871 ++tmp;
1872 etmp = strchr(tmp, ',');
1873 if (etmp)
1874 *etmp = '\0';
1875
1876 nstype = resolve_nstype(tmp);
1877 if (!nstype)
1878 return EINVAL;
1879
1880 if (opts.namespace & nstype)
1881 return ENOTUNIQ;
1882
1883 setns = get_namespace_fd(nstype);
1884
1885 if (!setns)
1886 return EFAULT;
1887
1888 if (*setns != -1)
1889 return ENOTUNIQ;
1890
1891 if (asprintf(&nspath, "/proc/%d/ns/%s", pid, tmp) < 0)
1892 return ENOMEM;
1893
1894 fd = open(nspath, O_RDONLY);
1895 free(nspath);
1896
1897 if (fd < 0)
1898 return errno?:ESTALE;
1899
1900 *setns = fd;
1901
1902 if (etmp)
1903 tmp = etmp;
1904 else
1905 tmp = NULL;
1906 } while (tmp);
1907
1908 return 0;
1909 }
1910
1911 static void get_jail_root_user(bool is_gidmap, uint32_t container_id, uint32_t host_id, uint32_t size)
1912 {
1913 if (container_id == 0 && size >= 1)
1914 if (!is_gidmap)
1915 opts.root_map_uid = host_id;
1916 }
1917
1918 enum {
1919 OCI_LINUX_UIDGIDMAP_CONTAINERID,
1920 OCI_LINUX_UIDGIDMAP_HOSTID,
1921 OCI_LINUX_UIDGIDMAP_SIZE,
1922 __OCI_LINUX_UIDGIDMAP_MAX,
1923 };
1924
1925 static const struct blobmsg_policy oci_linux_uidgidmap_policy[] = {
1926 [OCI_LINUX_UIDGIDMAP_CONTAINERID] = { "containerID", BLOBMSG_TYPE_INT32 },
1927 [OCI_LINUX_UIDGIDMAP_HOSTID] = { "hostID", BLOBMSG_TYPE_INT32 },
1928 [OCI_LINUX_UIDGIDMAP_SIZE] = { "size", BLOBMSG_TYPE_INT32 },
1929 };
1930
1931 static int parseOCIuidgidmappings(struct blob_attr *msg, bool is_gidmap)
1932 {
1933 struct blob_attr *tb[__OCI_LINUX_UIDGIDMAP_MAX];
1934 struct blob_attr *cur;
1935 int rem;
1936 char *map;
1937 size_t len, pos, totallen = 0;
1938
1939 blobmsg_for_each_attr(cur, msg, rem) {
1940 blobmsg_parse(oci_linux_uidgidmap_policy, __OCI_LINUX_UIDGIDMAP_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
1941
1942 if (!tb[OCI_LINUX_UIDGIDMAP_CONTAINERID] ||
1943 !tb[OCI_LINUX_UIDGIDMAP_HOSTID] ||
1944 !tb[OCI_LINUX_UIDGIDMAP_SIZE])
1945 return EINVAL;
1946
1947 /* count length */
1948 totallen += snprintf(NULL, 0, "%d %d %d\n",
1949 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
1950 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
1951 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
1952 }
1953
1954 /* allocate combined mapping string */
1955 map = malloc(totallen + 1);
1956 if (!map)
1957 return ENOMEM;
1958
1959 pos = 0;
1960 blobmsg_for_each_attr(cur, msg, rem) {
1961 blobmsg_parse(oci_linux_uidgidmap_policy, __OCI_LINUX_UIDGIDMAP_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
1962
1963 get_jail_root_user(is_gidmap, blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
1964 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
1965 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
1966
1967 /* write mapping line into pre-allocated string */
1968 len = snprintf(&map[pos], totallen + 1, "%d %d %d\n",
1969 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
1970 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
1971 blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
1972 pos += len;
1973 totallen -= len;
1974 }
1975
1976 assert(totallen == 0);
1977
1978 if (is_gidmap)
1979 opts.gidmap = map;
1980 else
1981 opts.uidmap = map;
1982
1983 return 0;
1984 }
1985
1986 enum {
1987 OCI_DEVICES_TYPE,
1988 OCI_DEVICES_PATH,
1989 OCI_DEVICES_MAJOR,
1990 OCI_DEVICES_MINOR,
1991 OCI_DEVICES_FILEMODE,
1992 OCI_DEVICES_UID,
1993 OCI_DEVICES_GID,
1994 __OCI_DEVICES_MAX,
1995 };
1996
1997 static const struct blobmsg_policy oci_devices_policy[] = {
1998 [OCI_DEVICES_TYPE] = { "type", BLOBMSG_TYPE_STRING },
1999 [OCI_DEVICES_PATH] = { "path", BLOBMSG_TYPE_STRING },
2000 [OCI_DEVICES_MAJOR] = { "major", BLOBMSG_TYPE_INT32 },
2001 [OCI_DEVICES_MINOR] = { "minor", BLOBMSG_TYPE_INT32 },
2002 [OCI_DEVICES_FILEMODE] = { "fileMode", BLOBMSG_TYPE_INT32 },
2003 [OCI_DEVICES_UID] = { "uid", BLOBMSG_TYPE_INT32 },
2004 [OCI_DEVICES_GID] = { "uid", BLOBMSG_TYPE_INT32 },
2005 };
2006
2007 static mode_t resolve_devtype(char *tstr)
2008 {
2009 if (!strcmp("c", tstr) ||
2010 !strcmp("u", tstr))
2011 return S_IFCHR;
2012 else if (!strcmp("b", tstr))
2013 return S_IFBLK;
2014 else if (!strcmp("p", tstr))
2015 return S_IFIFO;
2016 else
2017 return 0;
2018 }
2019
2020 static int parseOCIdevices(struct blob_attr *msg)
2021 {
2022 struct blob_attr *tb[__OCI_DEVICES_MAX];
2023 struct blob_attr *cur;
2024 int rem;
2025 size_t cnt = 0;
2026 struct mknod_args *tmp;
2027
2028 blobmsg_for_each_attr(cur, msg, rem)
2029 ++cnt;
2030
2031 opts.devices = calloc(cnt + 1, sizeof(struct mknod_args *));
2032
2033 cnt = 0;
2034 blobmsg_for_each_attr(cur, msg, rem) {
2035 blobmsg_parse(oci_devices_policy, __OCI_DEVICES_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
2036 if (!tb[OCI_DEVICES_TYPE] ||
2037 !tb[OCI_DEVICES_PATH])
2038 return ENODATA;
2039
2040 tmp = calloc(1, sizeof(struct mknod_args));
2041 if (!tmp)
2042 return ENOMEM;
2043
2044 tmp->mode = resolve_devtype(blobmsg_get_string(tb[OCI_DEVICES_TYPE]));
2045 if (!tmp->mode) {
2046 free(tmp);
2047 return EINVAL;
2048 }
2049
2050 if (tmp->mode != S_IFIFO) {
2051 if (!tb[OCI_DEVICES_MAJOR] || !tb[OCI_DEVICES_MINOR]) {
2052 free(tmp);
2053 return ENODATA;
2054 }
2055
2056 tmp->dev = makedev(blobmsg_get_u32(tb[OCI_DEVICES_MAJOR]),
2057 blobmsg_get_u32(tb[OCI_DEVICES_MINOR]));
2058 }
2059
2060 if (tb[OCI_DEVICES_FILEMODE]) {
2061 if (~(S_IRWXU|S_IRWXG|S_IRWXO) & blobmsg_get_u32(tb[OCI_DEVICES_FILEMODE])) {
2062 free(tmp);
2063 return EINVAL;
2064 }
2065
2066 tmp->mode |= blobmsg_get_u32(tb[OCI_DEVICES_FILEMODE]);
2067 } else {
2068 tmp->mode |= (S_IRUSR|S_IWUSR); /* 0600 */
2069 }
2070
2071 tmp->path = strdup(blobmsg_get_string(tb[OCI_DEVICES_PATH]));
2072
2073 if (tb[OCI_DEVICES_UID])
2074 tmp->uid = blobmsg_get_u32(tb[OCI_DEVICES_UID]);
2075 else
2076 tmp->uid = -1;
2077
2078 if (tb[OCI_DEVICES_GID])
2079 tmp->gid = blobmsg_get_u32(tb[OCI_DEVICES_GID]);
2080 else
2081 tmp->gid = -1;
2082
2083 DEBUG("read device %s (%s)\n", blobmsg_get_string(tb[OCI_DEVICES_PATH]), blobmsg_get_string(tb[OCI_DEVICES_TYPE]));
2084 opts.devices[cnt++] = tmp;
2085 }
2086
2087 opts.devices[cnt] = NULL;
2088
2089 return 0;
2090 }
2091
2092 static int parseOCIsysctl(struct blob_attr *msg)
2093 {
2094 struct blob_attr *cur;
2095 int rem;
2096 char *tmp, *tc;
2097 size_t cnt = 0;
2098
2099 blobmsg_for_each_attr(cur, msg, rem) {
2100 if (!blobmsg_name(cur) || !blobmsg_get_string(cur))
2101 return EINVAL;
2102
2103 ++cnt;
2104 }
2105
2106 if (!cnt)
2107 return 0;
2108
2109 opts.sysctl = calloc(cnt + 1, sizeof(struct sysctl_val *));
2110 if (!opts.sysctl)
2111 return ENOMEM;
2112
2113 cnt = 0;
2114 blobmsg_for_each_attr(cur, msg, rem) {
2115 opts.sysctl[cnt] = malloc(sizeof(struct sysctl_val));
2116 if (!opts.sysctl[cnt])
2117 return ENOMEM;
2118
2119 /* replace '.' with '/' in entry name */
2120 tc = tmp = strdup(blobmsg_name(cur));
2121 while ((tc = strchr(tc, '.')))
2122 *tc = '/';
2123
2124 opts.sysctl[cnt]->value = strdup(blobmsg_get_string(cur));
2125 opts.sysctl[cnt]->entry = tmp;
2126
2127 ++cnt;
2128 }
2129
2130 opts.sysctl[cnt] = NULL;
2131
2132 return 0;
2133 }
2134
2135
2136 enum {
2137 OCI_LINUX_CGROUPSPATH,
2138 OCI_LINUX_RESOURCES,
2139 OCI_LINUX_SECCOMP,
2140 OCI_LINUX_SYSCTL,
2141 OCI_LINUX_NAMESPACES,
2142 OCI_LINUX_DEVICES,
2143 OCI_LINUX_UIDMAPPINGS,
2144 OCI_LINUX_GIDMAPPINGS,
2145 OCI_LINUX_MASKEDPATHS,
2146 OCI_LINUX_READONLYPATHS,
2147 OCI_LINUX_ROOTFSPROPAGATION,
2148 __OCI_LINUX_MAX,
2149 };
2150
2151 static const struct blobmsg_policy oci_linux_policy[] = {
2152 [OCI_LINUX_CGROUPSPATH] = { "cgroupsPath", BLOBMSG_TYPE_STRING },
2153 [OCI_LINUX_RESOURCES] = { "resources", BLOBMSG_TYPE_TABLE },
2154 [OCI_LINUX_SECCOMP] = { "seccomp", BLOBMSG_TYPE_TABLE },
2155 [OCI_LINUX_SYSCTL] = { "sysctl", BLOBMSG_TYPE_TABLE },
2156 [OCI_LINUX_NAMESPACES] = { "namespaces", BLOBMSG_TYPE_ARRAY },
2157 [OCI_LINUX_DEVICES] = { "devices", BLOBMSG_TYPE_ARRAY },
2158 [OCI_LINUX_UIDMAPPINGS] = { "uidMappings", BLOBMSG_TYPE_ARRAY },
2159 [OCI_LINUX_GIDMAPPINGS] = { "gidMappings", BLOBMSG_TYPE_ARRAY },
2160 [OCI_LINUX_MASKEDPATHS] = { "maskedPaths", BLOBMSG_TYPE_ARRAY },
2161 [OCI_LINUX_READONLYPATHS] = { "readonlyPaths", BLOBMSG_TYPE_ARRAY },
2162 [OCI_LINUX_ROOTFSPROPAGATION] = { "rootfsPropagation", BLOBMSG_TYPE_STRING },
2163 };
2164
2165 static int parseOCIlinux(struct blob_attr *msg)
2166 {
2167 struct blob_attr *tb[__OCI_LINUX_MAX];
2168 struct blob_attr *cur;
2169 int rem;
2170 int res = 0;
2171 char *cgpath;
2172 char cgfullpath[256] = "/sys/fs/cgroup";
2173
2174 blobmsg_parse(oci_linux_policy, __OCI_LINUX_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
2175
2176 if (tb[OCI_LINUX_NAMESPACES]) {
2177 blobmsg_for_each_attr(cur, tb[OCI_LINUX_NAMESPACES], rem) {
2178 res = parseOCIlinuxns(cur);
2179 if (res)
2180 return res;
2181 }
2182 }
2183
2184 if (tb[OCI_LINUX_UIDMAPPINGS]) {
2185 res = parseOCIuidgidmappings(tb[OCI_LINUX_GIDMAPPINGS], 0);
2186 if (res)
2187 return res;
2188 }
2189
2190 if (tb[OCI_LINUX_GIDMAPPINGS]) {
2191 res = parseOCIuidgidmappings(tb[OCI_LINUX_GIDMAPPINGS], 1);
2192 if (res)
2193 return res;
2194 }
2195
2196 if (tb[OCI_LINUX_READONLYPATHS]) {
2197 blobmsg_for_each_attr(cur, tb[OCI_LINUX_READONLYPATHS], rem) {
2198 res = add_mount(NULL, blobmsg_get_string(cur), NULL, MS_BIND | MS_REC | MS_RDONLY, 0, NULL, 0);
2199 if (res)
2200 return res;
2201 }
2202 }
2203
2204 if (tb[OCI_LINUX_MASKEDPATHS]) {
2205 blobmsg_for_each_attr(cur, tb[OCI_LINUX_MASKEDPATHS], rem) {
2206 res = add_mount((void *)(-1), blobmsg_get_string(cur), NULL, 0, 0, NULL, 0);
2207 if (res)
2208 return res;
2209 }
2210 }
2211
2212 if (tb[OCI_LINUX_SYSCTL]) {
2213 res = parseOCIsysctl(tb[OCI_LINUX_SYSCTL]);
2214 if (res)
2215 return res;
2216 }
2217
2218 if (tb[OCI_LINUX_SECCOMP]) {
2219 opts.ociseccomp = parseOCIlinuxseccomp(tb[OCI_LINUX_SECCOMP]);
2220 if (!opts.ociseccomp)
2221 return EINVAL;
2222 }
2223
2224 if (tb[OCI_LINUX_DEVICES]) {
2225 res = parseOCIdevices(tb[OCI_LINUX_DEVICES]);
2226 if (res)
2227 return res;
2228 }
2229
2230 if (tb[OCI_LINUX_CGROUPSPATH]) {
2231 cgpath = blobmsg_get_string(tb[OCI_LINUX_CGROUPSPATH]);
2232 if (cgpath[0] == '/') {
2233 if (strlen(cgpath) + 1 >= (sizeof(cgfullpath) - strlen(cgfullpath)))
2234 return E2BIG;
2235
2236 strcat(cgfullpath, cgpath);
2237 } else {
2238 strcat(cgfullpath, "/containers/");
2239 if (strlen(opts.name) + strlen(cgpath) + 2 >= (sizeof(cgfullpath) - strlen(cgfullpath)))
2240 return E2BIG;
2241
2242 strcat(cgfullpath, opts.name); /* should be container name rather than jail name */
2243 strcat(cgfullpath, "/");
2244 strcat(cgfullpath, cgpath);
2245 }
2246 } else {
2247 strcat(cgfullpath, "/containers/");
2248 if (2 * strlen(opts.name) + 2 >= (sizeof(cgfullpath) - strlen(cgfullpath)))
2249 return E2BIG;
2250
2251 strcat(cgfullpath, opts.name); /* should be container name rather than jail name */
2252 strcat(cgfullpath, "/");
2253 strcat(cgfullpath, opts.name); /* should be container instance name rather than jail name */
2254 }
2255
2256 cgroups_init(cgfullpath);
2257
2258 if (tb[OCI_LINUX_RESOURCES]) {
2259 res = parseOCIlinuxcgroups(tb[OCI_LINUX_RESOURCES]);
2260 if (res)
2261 return res;
2262 }
2263
2264 return 0;
2265 }
2266
2267 enum {
2268 OCI_VERSION,
2269 OCI_HOSTNAME,
2270 OCI_PROCESS,
2271 OCI_ROOT,
2272 OCI_MOUNTS,
2273 OCI_HOOKS,
2274 OCI_LINUX,
2275 OCI_ANNOTATIONS,
2276 __OCI_MAX,
2277 };
2278
2279 static const struct blobmsg_policy oci_policy[] = {
2280 [OCI_VERSION] = { "ociVersion", BLOBMSG_TYPE_STRING },
2281 [OCI_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
2282 [OCI_PROCESS] = { "process", BLOBMSG_TYPE_TABLE },
2283 [OCI_ROOT] = { "root", BLOBMSG_TYPE_TABLE },
2284 [OCI_MOUNTS] = { "mounts", BLOBMSG_TYPE_ARRAY },
2285 [OCI_HOOKS] = { "hooks", BLOBMSG_TYPE_TABLE },
2286 [OCI_LINUX] = { "linux", BLOBMSG_TYPE_TABLE },
2287 [OCI_ANNOTATIONS] = { "annotations", BLOBMSG_TYPE_TABLE },
2288 };
2289
2290 static int parseOCI(const char *jsonfile)
2291 {
2292 struct blob_attr *tb[__OCI_MAX];
2293 struct blob_attr *cur;
2294 int rem;
2295 int res;
2296
2297 blob_buf_init(&ocibuf, 0);
2298
2299 if (!blobmsg_add_json_from_file(&ocibuf, jsonfile)) {
2300 res=ENOENT;
2301 goto errout;
2302 }
2303
2304 blobmsg_parse(oci_policy, __OCI_MAX, tb, blob_data(ocibuf.head), blob_len(ocibuf.head));
2305
2306 if (!tb[OCI_VERSION]) {
2307 res=ENOMSG;
2308 goto errout;
2309 }
2310
2311 if (strncmp("1.0", blobmsg_get_string(tb[OCI_VERSION]), 3)) {
2312 ERROR("unsupported ociVersion %s\n", blobmsg_get_string(tb[OCI_VERSION]));
2313 res=ENOTSUP;
2314 goto errout;
2315 }
2316
2317 if (tb[OCI_HOSTNAME])
2318 opts.hostname = strdup(blobmsg_get_string(tb[OCI_HOSTNAME]));
2319
2320 if (!tb[OCI_PROCESS]) {
2321 res=ENODATA;
2322 goto errout;
2323 }
2324
2325 if ((res = parseOCIprocess(tb[OCI_PROCESS])))
2326 goto errout;
2327
2328 if (!tb[OCI_ROOT]) {
2329 res=ENODATA;
2330 goto errout;
2331 }
2332 if ((res = parseOCIroot(jsonfile, tb[OCI_ROOT])))
2333 goto errout;
2334
2335 if (!tb[OCI_MOUNTS]) {
2336 res=ENODATA;
2337 goto errout;
2338 }
2339
2340 blobmsg_for_each_attr(cur, tb[OCI_MOUNTS], rem)
2341 if ((res = parseOCImount(cur)))
2342 goto errout;
2343
2344 if (tb[OCI_LINUX] && (res = parseOCIlinux(tb[OCI_LINUX])))
2345 goto errout;
2346
2347 if (tb[OCI_HOOKS] && (res = parseOCIhooks(tb[OCI_HOOKS])))
2348 goto errout;
2349
2350 if (tb[OCI_ANNOTATIONS])
2351 opts.annotations = blob_memdup(tb[OCI_ANNOTATIONS]);
2352
2353 errout:
2354 blob_buf_free(&ocibuf);
2355
2356 return res;
2357 }
2358
2359 static int set_oom_score_adj(void)
2360 {
2361 int f;
2362 char fname[32];
2363
2364 if (!opts.set_oom_score_adj)
2365 return 0;
2366
2367 snprintf(fname, sizeof(fname), "/proc/%u/oom_score_adj", jail_process.pid);
2368 f = open(fname, O_WRONLY | O_TRUNC);
2369 if (f < 0)
2370 return errno;
2371
2372 dprintf(f, "%d", opts.oom_score_adj);
2373 close(f);
2374
2375 return 0;
2376 }
2377
2378
2379 enum {
2380 OCI_STATE_CREATING,
2381 OCI_STATE_CREATED,
2382 OCI_STATE_RUNNING,
2383 OCI_STATE_STOPPED,
2384 };
2385
2386 static int jail_oci_state = OCI_STATE_CREATED;
2387 static void pipe_send_start_container(struct uloop_timeout *t);
2388 static struct uloop_timeout start_container_timeout = {
2389 .cb = pipe_send_start_container,
2390 };
2391
2392 static int handle_start(struct ubus_context *ctx, struct ubus_object *obj,
2393 struct ubus_request_data *req, const char *method,
2394 struct blob_attr *msg)
2395 {
2396 if (jail_oci_state != OCI_STATE_CREATED)
2397 return UBUS_STATUS_INVALID_ARGUMENT;
2398
2399 uloop_timeout_add(&start_container_timeout);
2400
2401 return UBUS_STATUS_OK;
2402 }
2403
2404 static struct blob_buf bb;
2405 static int handle_state(struct ubus_context *ctx, struct ubus_object *obj,
2406 struct ubus_request_data *req, const char *method,
2407 struct blob_attr *msg)
2408 {
2409 char *statusstr;
2410
2411 switch (jail_oci_state) {
2412 case OCI_STATE_CREATING:
2413 statusstr = "creating";
2414 break;
2415 case OCI_STATE_CREATED:
2416 statusstr = "created";
2417 break;
2418 case OCI_STATE_RUNNING:
2419 statusstr = "running";
2420 break;
2421 case OCI_STATE_STOPPED:
2422 statusstr = "stopped";
2423 break;
2424 default:
2425 statusstr = "unknown";
2426 }
2427
2428 blob_buf_init(&bb, 0);
2429 blobmsg_add_string(&bb, "ociVersion", OCI_VERSION_STRING);
2430 blobmsg_add_string(&bb, "id", opts.name);
2431 blobmsg_add_string(&bb, "status", statusstr);
2432 if (jail_oci_state == OCI_STATE_CREATED ||
2433 jail_oci_state == OCI_STATE_RUNNING)
2434 blobmsg_add_u32(&bb, "pid", jail_process.pid);
2435
2436 blobmsg_add_string(&bb, "bundle", opts.ocibundle);
2437
2438 if (opts.annotations)
2439 blobmsg_add_blob(&bb, opts.annotations);
2440
2441 ubus_send_reply(ctx, req, bb.head);
2442
2443 return UBUS_STATUS_OK;
2444 }
2445
2446 enum {
2447 CONTAINER_KILL_ATTR_SIGNAL,
2448 __CONTAINER_KILL_ATTR_MAX,
2449 };
2450
2451 static const struct blobmsg_policy container_kill_attrs[__CONTAINER_KILL_ATTR_MAX] = {
2452 [CONTAINER_KILL_ATTR_SIGNAL] = { "signal", BLOBMSG_TYPE_INT32 },
2453 };
2454
2455 static int
2456 container_handle_kill(struct ubus_context *ctx, struct ubus_object *obj,
2457 struct ubus_request_data *req, const char *method,
2458 struct blob_attr *msg)
2459 {
2460 struct blob_attr *tb[__CONTAINER_KILL_ATTR_MAX], *cur;
2461 int sig = SIGTERM;
2462
2463 blobmsg_parse(container_kill_attrs, __CONTAINER_KILL_ATTR_MAX, tb, blobmsg_data(msg), blobmsg_data_len(msg));
2464
2465 cur = tb[CONTAINER_KILL_ATTR_SIGNAL];
2466 if (cur)
2467 sig = blobmsg_get_u32(cur);
2468
2469 if (jail_oci_state == OCI_STATE_CREATING)
2470 return UBUS_STATUS_NOT_FOUND;
2471
2472 if (kill(jail_process.pid, sig) == 0)
2473 return 0;
2474
2475 switch (errno) {
2476 case EINVAL: return UBUS_STATUS_INVALID_ARGUMENT;
2477 case EPERM: return UBUS_STATUS_PERMISSION_DENIED;
2478 case ESRCH: return UBUS_STATUS_NOT_FOUND;
2479 }
2480
2481 return UBUS_STATUS_UNKNOWN_ERROR;
2482 }
2483
2484 static int
2485 jail_writepid(pid_t pid)
2486 {
2487 FILE *_pidfile;
2488
2489 if (!opts.pidfile)
2490 return 0;
2491
2492 _pidfile = fopen(opts.pidfile, "w");
2493 if (_pidfile == NULL)
2494 return errno;
2495
2496 if (fprintf(_pidfile, "%d\n", pid) < 0) {
2497 fclose(_pidfile);
2498 return errno;
2499 }
2500
2501 if (fclose(_pidfile))
2502 return errno;
2503
2504 return 0;
2505 }
2506
2507 static int checkpath(const char *path)
2508 {
2509 int dirfd = open(path, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
2510 if (dirfd < 0) {
2511 ERROR("path %s open failed %m\n", path);
2512 return -1;
2513 }
2514 close(dirfd);
2515
2516 return 0;
2517 }
2518
2519 static struct ubus_method container_methods[] = {
2520 UBUS_METHOD_NOARG("start", handle_start),
2521 UBUS_METHOD_NOARG("state", handle_state),
2522 UBUS_METHOD("kill", container_handle_kill, container_kill_attrs),
2523 };
2524
2525 static struct ubus_object_type container_object_type =
2526 UBUS_OBJECT_TYPE("container", container_methods);
2527
2528 static struct ubus_object container_object = {
2529 .type = &container_object_type,
2530 .methods = container_methods,
2531 .n_methods = ARRAY_SIZE(container_methods),
2532 };
2533
2534 static void post_main(struct uloop_timeout *t);
2535 static struct uloop_timeout post_main_timeout = {
2536 .cb = post_main,
2537 };
2538 static int netns_fd;
2539 static int pidns_fd;
2540 #ifdef CLONE_NEWTIME
2541 static int timens_fd;
2542 #endif
2543 static void post_create_runtime(void);
2544 int main(int argc, char **argv)
2545 {
2546 uid_t uid = getuid();
2547 const char log[] = "/dev/log";
2548 const char ubus[] = "/var/run/ubus/ubus.sock";
2549 int ret = EXIT_FAILURE;
2550 int ch;
2551 char *tmp;
2552
2553 if (uid) {
2554 ERROR("not root, aborting: %m\n");
2555 return EXIT_FAILURE;
2556 }
2557
2558 /* those are filehandlers, so -1 indicates unused */
2559 opts.setns.pid = -1;
2560 opts.setns.net = -1;
2561 opts.setns.ns = -1;
2562 opts.setns.ipc = -1;
2563 opts.setns.uts = -1;
2564 opts.setns.user = -1;
2565 opts.setns.cgroup = -1;
2566 #ifdef CLONE_NEWTIME
2567 opts.setns.time = -1;
2568 #endif
2569
2570 umask(022);
2571 mount_list_init();
2572 init_library_search();
2573 cgroups_prepare();
2574 exit_from_child = false;
2575
2576 while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
2577 switch (ch) {
2578 case 'd':
2579 debug = atoi(optarg);
2580 break;
2581 case 'p':
2582 opts.namespace |= CLONE_NEWNS;
2583 opts.procfs = 1;
2584 break;
2585 case 'o':
2586 opts.namespace |= CLONE_NEWNS;
2587 opts.ronly = 1;
2588 break;
2589 case 'f':
2590 opts.namespace |= CLONE_NEWUSER;
2591 break;
2592 case 'F':
2593 opts.namespace |= CLONE_NEWCGROUP;
2594 break;
2595 case 'R':
2596 opts.extroot = realpath(optarg, NULL);
2597 break;
2598 case 's':
2599 opts.namespace |= CLONE_NEWNS;
2600 opts.sysfs = 1;
2601 break;
2602 case 'S':
2603 opts.seccomp = optarg;
2604 add_mount_bind(optarg, 1, -1);
2605 break;
2606 case 'C':
2607 opts.capabilities = optarg;
2608 break;
2609 case 'c':
2610 opts.no_new_privs = 1;
2611 break;
2612 case 'n':
2613 opts.name = optarg;
2614 break;
2615 case 'N':
2616 opts.namespace |= CLONE_NEWNET;
2617 break;
2618 case 'h':
2619 opts.namespace |= CLONE_NEWUTS;
2620 opts.hostname = strdup(optarg);
2621 break;
2622 case 'j':
2623 jail_join_ns(optarg);
2624 break;
2625 case 'r':
2626 opts.namespace |= CLONE_NEWNS;
2627 tmp = strchr(optarg, ':');
2628 if (tmp) {
2629 *(tmp++) = '\0';
2630 add_2paths_and_deps(optarg, tmp, 1, 0, 0);
2631 } else {
2632 add_path_and_deps(optarg, 1, 0, 0);
2633 }
2634 break;
2635 case 'w':
2636 opts.namespace |= CLONE_NEWNS;
2637 tmp = strchr(optarg, ':');
2638 if (tmp) {
2639 *(tmp++) = '\0';
2640 add_2paths_and_deps(optarg, tmp, 0, 0, 0);
2641 } else {
2642 add_path_and_deps(optarg, 0, 0, 0);
2643 }
2644 break;
2645 case 'u':
2646 opts.namespace |= CLONE_NEWNS;
2647 add_mount_bind(ubus, 0, -1);
2648 break;
2649 case 'l':
2650 opts.namespace |= CLONE_NEWNS;
2651 add_mount_bind(log, 0, -1);
2652 break;
2653 case 'U':
2654 opts.user = optarg;
2655 break;
2656 case 'G':
2657 opts.group = optarg;
2658 break;
2659 case 'O':
2660 opts.overlaydir = realpath(optarg, NULL);
2661 break;
2662 case 'T':
2663 opts.tmpoverlaysize = optarg;
2664 break;
2665 case 'E':
2666 opts.require_jail = 1;
2667 break;
2668 case 'y':
2669 opts.console = 1;
2670 break;
2671 case 'J':
2672 opts.ocibundle = optarg;
2673 break;
2674 case 'i':
2675 opts.immediately = true;
2676 break;
2677 case 'P':
2678 opts.pidfile = optarg;
2679 break;
2680 }
2681 }
2682
2683 if (opts.namespace && !opts.ocibundle)
2684 opts.namespace |= CLONE_NEWIPC | CLONE_NEWPID;
2685
2686 /*
2687 * uid in parent user namespace representing root user in new
2688 * user namespace, defaults to nobody unless specified in uidMappings
2689 */
2690 opts.root_map_uid = 65534;
2691
2692 if (opts.capabilities && parseOCIcapabilities_from_file(&opts.capset, opts.capabilities)) {
2693 ERROR("failed to read capabilities from file %s\n", opts.capabilities);
2694 ret=-1;
2695 goto errout;
2696 }
2697
2698 if (opts.ocibundle) {
2699 char *jsonfile;
2700 int ocires;
2701
2702 if (!opts.name) {
2703 ERROR("OCI bundle needs a named jail\n");
2704 ret=-1;
2705 goto errout;
2706 }
2707 if (asprintf(&jsonfile, "%s/config.json", opts.ocibundle) < 0) {
2708 ret=-ENOMEM;
2709 goto errout;
2710 }
2711 ocires = parseOCI(jsonfile);
2712 free(jsonfile);
2713 if (ocires) {
2714 ERROR("parsing of OCI JSON spec has failed: %s (%d)\n", strerror(ocires), ocires);
2715 ret=ocires;
2716 goto errout;
2717 }
2718 }
2719
2720 if (opts.namespace & CLONE_NEWNET) {
2721 if (!opts.name) {
2722 ERROR("netns needs a named jail\n");
2723 ret=-1;
2724 goto errout;
2725 }
2726 }
2727
2728
2729 if (opts.tmpoverlaysize && strlen(opts.tmpoverlaysize) > 8) {
2730 ERROR("size parameter too long: \"%s\"\n", opts.tmpoverlaysize);
2731 ret=-1;
2732 goto errout;
2733 }
2734
2735 if (opts.extroot && checkpath(opts.extroot)) {
2736 ERROR("invalid rootfs path '%s'", opts.extroot);
2737 ret=-1;
2738 goto errout;
2739 }
2740
2741 if (opts.overlaydir && checkpath(opts.overlaydir)) {
2742 ERROR("invalid rootfs overlay path '%s'", opts.overlaydir);
2743 ret=-1;
2744 goto errout;
2745 }
2746
2747 /* no <binary> param found */
2748 if (!opts.ocibundle && (argc - optind < 1)) {
2749 usage();
2750 ret=EXIT_FAILURE;
2751 goto errout;
2752 }
2753 if (!(opts.ocibundle||opts.namespace||opts.capabilities||opts.seccomp||
2754 (opts.setns.net != -1) ||
2755 (opts.setns.ns != -1) ||
2756 (opts.setns.ipc != -1) ||
2757 (opts.setns.uts != -1) ||
2758 (opts.setns.user != -1) ||
2759 (opts.setns.cgroup != -1))) {
2760 ERROR("Not using namespaces, capabilities or seccomp !!!\n\n");
2761 usage();
2762 ret=EXIT_FAILURE;
2763 goto errout;
2764 }
2765 DEBUG("Using namespaces(0x%08x), capabilities(%d), seccomp(%d)\n",
2766 opts.namespace,
2767 opts.capset.apply,
2768 opts.seccomp != 0 || opts.ociseccomp != 0);
2769
2770 uloop_init();
2771 signals_init();
2772
2773 parent_ctx = ubus_connect(NULL);
2774 ubus_add_uloop(parent_ctx);
2775
2776 if (opts.ocibundle) {
2777 char *objname;
2778 if (asprintf(&objname, "container.%s", opts.name) < 0) {
2779 ret=-ENOMEM;
2780 goto errout;
2781 }
2782
2783 container_object.name = objname;
2784 ret = ubus_add_object(parent_ctx, &container_object);
2785 if (ret) {
2786 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
2787 ret=-1;
2788 goto errout;
2789 }
2790 }
2791
2792 /* deliberately not using 'else' on unrelated conditional branches */
2793 if (!opts.ocibundle) {
2794 /* allocate NULL-terminated array for argv */
2795 opts.jail_argv = calloc(1 + argc - optind, sizeof(void *));
2796 if (!opts.jail_argv) {
2797 ret=EXIT_FAILURE;
2798 goto errout;
2799 }
2800 for (size_t s = optind; s < argc; s++)
2801 opts.jail_argv[s - optind] = strdup(argv[s]);
2802
2803 if (opts.namespace & CLONE_NEWUSER)
2804 get_jail_user(&opts.pw_uid, &opts.pw_gid, &opts.gr_gid);
2805 }
2806
2807 if (!opts.extroot) {
2808 if (opts.namespace && add_path_and_deps(*opts.jail_argv, 1, -1, 0)) {
2809 ERROR("failed to load dependencies\n");
2810 ret=-1;
2811 goto errout;
2812 }
2813 }
2814
2815 if (opts.namespace && opts.seccomp && add_path_and_deps("libpreload-seccomp.so", 1, -1, 1)) {
2816 ERROR("failed to load libpreload-seccomp.so\n");
2817 opts.seccomp = 0;
2818 if (opts.require_jail) {
2819 ret=-1;
2820 goto errout;
2821 }
2822 }
2823
2824 uloop_timeout_add(&post_main_timeout);
2825 uloop_run();
2826
2827 errout:
2828 if (opts.ocibundle)
2829 cgroups_free();
2830
2831 free_opts(true);
2832
2833 return ret;
2834 }
2835
2836 static void post_main(struct uloop_timeout *t)
2837 {
2838 if (apply_rlimits()) {
2839 ERROR("error applying resource limits\n");
2840 free_and_exit(EXIT_FAILURE);
2841 }
2842
2843 if (opts.name)
2844 prctl(PR_SET_NAME, opts.name, NULL, NULL, NULL);
2845
2846 if (pipe(&pipes[0]) < 0 || pipe(&pipes[2]) < 0)
2847 free_and_exit(-1);
2848
2849 if (has_namespaces()) {
2850 if (opts.namespace & CLONE_NEWNS) {
2851 if (!opts.extroot && (opts.user || opts.group)) {
2852 add_mount_bind("/etc/passwd", 1, -1);
2853 add_mount_bind("/etc/group", 1, -1);
2854 }
2855
2856 #if defined(__GLIBC__)
2857 if (!opts.extroot)
2858 add_mount_bind("/etc/nsswitch.conf", 1, -1);
2859 #endif
2860 if (opts.setns.ns == -1) {
2861 if (!(opts.namespace & CLONE_NEWNET)) {
2862 add_mount_bind("/etc/resolv.conf", 1, 0);
2863 } else {
2864 /* new mount namespace to provide /dev/resolv.conf.d */
2865 char hostdir[PATH_MAX];
2866
2867 snprintf(hostdir, PATH_MAX, "/tmp/resolv.conf-%s.d", opts.name);
2868 mkdir_p(hostdir, 0755);
2869 add_mount(hostdir, "/dev/resolv.conf.d", NULL,
2870 MS_BIND | MS_NOEXEC | MS_NOATIME | MS_NOSUID | MS_NODEV | MS_RDONLY, 0, NULL, 0);
2871 }
2872 }
2873 /* default mounts */
2874 add_mount(NULL, "/dev", "tmpfs", MS_NOATIME | MS_NOEXEC | MS_NOSUID, 0, "size=1M", -1);
2875 add_mount(NULL, "/dev/pts", "devpts", MS_NOATIME | MS_NOEXEC | MS_NOSUID, 0, "newinstance,ptmxmode=0666,mode=0620,gid=5", 0);
2876
2877 if (opts.procfs || opts.ocibundle) {
2878 add_mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0, NULL, -1);
2879
2880 /*
2881 * hack to make /proc/sys/net read-write while the rest of /proc/sys is read-only
2882 * which cannot be expressed with OCI spec, but happends to be very useful.
2883 * Only apply it if '/proc/sys' is not already listed as mount, maskedPath or
2884 * readonlyPath.
2885 * If not running in a new network namespace, only make /proc/sys read-only.
2886 * If running in a new network namespace, temporarily stash (ie. mount-bind)
2887 * /proc/sys/net into (totally unrelated, but surely existing) /proc/self/net.
2888 * Then we mount-bind /proc/sys read-only and then mount-move /proc/self/net into
2889 * /proc/sys/net.
2890 * This works because mounts are executed in incrementing strcmp() order and
2891 * /proc/self/net appears there before /proc/sys/net and hence the operation
2892 * succeeds as the bind-mount of /proc/self/net is performed first and then
2893 * move-mount of /proc/sys/net follows because 'e' preceeds 'y' in the ASCII
2894 * table (and in the alphabet).
2895 */
2896 if (!add_mount(NULL, "/proc/sys", NULL, MS_BIND | MS_RDONLY, 0, NULL, -1))
2897 if (opts.namespace & CLONE_NEWNET)
2898 if (!add_mount_inner("/proc/self/net", "/proc/sys/net", NULL, MS_MOVE, 0, NULL, -1))
2899 add_mount_inner("/proc/sys/net", "/proc/self/net", NULL, MS_BIND, 0, NULL, -1);
2900
2901 }
2902 if (opts.sysfs || opts.ocibundle)
2903 add_mount("sysfs", "/sys", "sysfs", MS_RELATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_RDONLY, 0, NULL, -1);
2904
2905 if (opts.ocibundle)
2906 add_mount("shm", "/dev/shm", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV, 0, "mode=1777", -1);
2907
2908 }
2909
2910 if (opts.setns.pid != -1) {
2911 pidns_fd = ns_open_pid("pid", getpid());
2912 setns_open(CLONE_NEWPID);
2913 } else {
2914 pidns_fd = -1;
2915 }
2916
2917 #ifdef CLONE_NEWTIME
2918 if (opts.setns.time != -1) {
2919 timens_fd = ns_open_pid("time", getpid());
2920 setns_open(CLONE_NEWTIME);
2921 } else {
2922 timens_fd = -1;
2923 }
2924 #endif
2925
2926 if (opts.namespace & CLONE_NEWUSER) {
2927 if (prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP)) {
2928 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
2929 free_and_exit(EXIT_FAILURE);
2930 }
2931 if (seteuid(opts.root_map_uid)) {
2932 ERROR("seteuid(%d) failed: %m\n", opts.root_map_uid);
2933 free_and_exit(EXIT_FAILURE);
2934 }
2935 }
2936
2937 jail_process.pid = clone(exec_jail, child_stack + STACK_SIZE, SIGCHLD | (opts.namespace & (~CLONE_NEWCGROUP)), NULL);
2938 } else {
2939 jail_process.pid = fork();
2940 }
2941
2942 if (jail_process.pid > 0) {
2943 /* parent process */
2944 char sig_buf[1];
2945
2946 uloop_process_add(&jail_process);
2947 jail_running = 1;
2948 if (seteuid(0)) {
2949 ERROR("seteuid(%d) failed: %m\n", opts.root_map_uid);
2950 free_and_exit(EXIT_FAILURE);
2951 }
2952
2953 prctl(PR_SET_SECUREBITS, 0);
2954
2955 if (pidns_fd != -1) {
2956 setns(pidns_fd, CLONE_NEWPID);
2957 close(pidns_fd);
2958 }
2959 #ifdef CLONE_NEWTIME
2960 if (timens_fd != -1) {
2961 setns(timens_fd, CLONE_NEWTIME);
2962 close(timens_fd);
2963 }
2964 #endif
2965 if (opts.setns.net != -1)
2966 close(opts.setns.net);
2967 if (opts.setns.ns != -1)
2968 close(opts.setns.ns);
2969 if (opts.setns.ipc != -1)
2970 close(opts.setns.ipc);
2971 if (opts.setns.uts != -1)
2972 close(opts.setns.uts);
2973 if (opts.setns.user != -1)
2974 close(opts.setns.user);
2975 if (opts.setns.cgroup != -1)
2976 close(opts.setns.cgroup);
2977 close(pipes[1]);
2978 close(pipes[2]);
2979 if (read(pipes[0], sig_buf, 1) < 1) {
2980 ERROR("can't read from child\n");
2981 free_and_exit(-1);
2982 }
2983 close(pipes[0]);
2984 set_oom_score_adj();
2985
2986 if (opts.ocibundle)
2987 cgroups_apply(jail_process.pid);
2988
2989 if (opts.namespace & CLONE_NEWUSER) {
2990 if (write_setgroups(jail_process.pid, true)) {
2991 ERROR("can't write setgroups\n");
2992 free_and_exit(-1);
2993 }
2994 if (!opts.uidmap) {
2995 bool has_gr = (opts.gr_gid != -1);
2996 if (opts.pw_uid != -1) {
2997 write_single_uid_gid_map(jail_process.pid, 0, opts.pw_uid);
2998 write_single_uid_gid_map(jail_process.pid, 1, has_gr?opts.gr_gid:opts.pw_gid);
2999 } else {
3000 write_single_uid_gid_map(jail_process.pid, 0, 65534);
3001 write_single_uid_gid_map(jail_process.pid, 1, has_gr?opts.gr_gid:65534);
3002 }
3003 } else {
3004 write_uid_gid_map(jail_process.pid, 0, opts.uidmap);
3005 if (opts.gidmap)
3006 write_uid_gid_map(jail_process.pid, 1, opts.gidmap);
3007 }
3008 }
3009
3010 if (opts.namespace & CLONE_NEWNET)
3011 jail_network_start(parent_ctx, opts.name, jail_process.pid);
3012
3013 if (jail_writepid(jail_process.pid)) {
3014 ERROR("failed to write pidfile: %m\n");
3015 free_and_exit(-1);
3016 }
3017 } else if (jail_process.pid == 0) {
3018 /* fork child process */
3019 free_and_exit(exec_jail(NULL));
3020 } else {
3021 ERROR("failed to clone/fork: %m\n");
3022 free_and_exit(EXIT_FAILURE);
3023 }
3024 run_hooks(opts.hooks.createRuntime, post_create_runtime);
3025 }
3026
3027 static void post_poststart(void);
3028 static void post_create_runtime(void)
3029 {
3030 char sig_buf[1];
3031
3032 sig_buf[0] = 'O';
3033 if (write(pipes[3], sig_buf, 1) < 0) {
3034 ERROR("can't write to child\n");
3035 free_and_exit(-1);
3036 }
3037
3038 jail_oci_state = OCI_STATE_CREATED;
3039 if (opts.ocibundle && !opts.immediately)
3040 uloop_run(); /* wait for 'start' command via ubus */
3041 else
3042 pipe_send_start_container(NULL);
3043 }
3044
3045 static void pipe_send_start_container(struct uloop_timeout *t)
3046 {
3047 char sig_buf[1];
3048
3049 jail_oci_state = OCI_STATE_RUNNING;
3050 sig_buf[0] = '!';
3051 if (write(pipes[3], sig_buf, 1) < 0) {
3052 ERROR("can't write to child\n");
3053 free_and_exit(-1);
3054 }
3055 close(pipes[3]);
3056
3057 run_hooks(opts.hooks.poststart, post_poststart);
3058 }
3059
3060 static void post_poststart(void)
3061 {
3062 uloop_run(); /* idle here while jail is running */
3063 if (jail_running) {
3064 DEBUG("uloop interrupted, killing jail process\n");
3065 kill(jail_process.pid, SIGTERM);
3066 uloop_timeout_set(&jail_process_timeout, 1000);
3067 uloop_run();
3068 }
3069 uloop_done();
3070 poststop();
3071 }
3072
3073 static void post_poststop(void);
3074 static void poststop(void) {
3075 if (opts.namespace & CLONE_NEWNET) {
3076 setns(netns_fd, CLONE_NEWNET);
3077 jail_network_stop();
3078 close(netns_fd);
3079 }
3080 run_hooks(opts.hooks.poststop, post_poststop);
3081 }
3082
3083 static void post_poststop(void)
3084 {
3085 free_opts(true);
3086 if (parent_ctx)
3087 ubus_free(parent_ctx);
3088
3089 exit(jail_return_code);
3090 }
OpenWrt service / process manager