2 * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
3 * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
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
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.
16 #include <sys/mount.h>
17 #include <sys/prctl.h>
19 #include <sys/types.h>
21 #include <sys/resource.h>
23 #include <sys/sysmacros.h>
25 /* musl only defined 15 limit types, make sure all 16 are supported */
27 #define RLIMIT_RTTIME 15
29 #define RLIMIT_NLIMITS 16
31 #define RLIM_NLIMITS 16
43 #include <linux/filter.h>
44 #include <linux/limits.h>
45 #include <linux/nsfs.h>
46 #include <linux/securebits.h>
50 #include "capabilities.h"
55 #include "seccomp-oci.h"
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>
67 #ifndef CLONE_NEWCGROUP
68 #define CLONE_NEWCGROUP 0x02000000
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"
74 #define OCI_VERSION_STRING "1.0.2"
102 struct sock_fprog
*ociseccomp
;
104 struct jail_capset capset
;
109 char *tmpoverlaysize
;
114 struct sysctl_val
**sysctl
;
137 gid_t
*additional_gids
;
138 size_t num_additional_gids
;
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
;
149 struct rlimit
*rlimits
[RLIM_NLIMITS
];
151 bool set_oom_score_adj
;
152 struct mknod_args
**devices
;
155 struct blob_attr
*annotations
;
158 static struct blob_buf ocibuf
;
160 extern int pivot_root(const char *new_root
, const char *put_old
);
164 static char child_stack
[STACK_SIZE
];
166 static struct ubus_context
*parent_ctx
;
171 static inline bool has_namespaces(void)
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) ||
181 (opts
.setns
.time
!= -1) ||
186 static void free_oci_envp(char **p
) {
198 static void free_hooklist(struct hook_execvpe
**hooklist
)
200 struct hook_execvpe
*cur
;
207 free_oci_envp(cur
->argv
);
208 free_oci_envp(cur
->envp
);
215 static void free_sysctl(void) {
216 struct sysctl_val
*cur
;
227 static void free_devices(void) {
228 struct mknod_args
**cur
;
242 static void free_rlimits(void) {
245 for (type
= 0; type
< RLIM_NLIMITS
; ++type
)
246 free(opts
.rlimits
[type
]);
249 static void free_opts(bool parent
) {
251 free_library_search();
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
);
262 free_oci_envp(opts
.jail_argv
);
263 free_oci_envp(opts
.envp
);
273 free(opts
.annotations
);
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
);
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";
288 if (asprintf(&upperdir
, "%s%s", overlaydir
, "/upper") < 0)
291 if (asprintf(&workdir
, "%s%s", overlaydir
, "/work") < 0)
294 if (asprintf(&optsstr
, mountoptsformat
, jail_root
, upperdir
, workdir
) < 0)
297 if (mkdir_p(upperdir
, 0755) || mkdir_p(workdir
, 0755))
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
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.
309 if (asprintf(&upperetc
, "%s/etc", upperdir
) < 0)
312 if (mkdir_p(upperetc
, 0755))
313 goto upper_etc_printf
;
315 if (asprintf(&upperresolvconf
, "%s/resolv.conf", upperetc
) < 0)
316 goto upper_etc_printf
;
318 fd
= creat(upperresolvconf
, 0644);
321 ERROR("creat(%s) failed: %m\n", upperresolvconf
);
325 DEBUG("mount -t overlay %s %s (%s)\n", jail_root
, jail_root
, optsstr
);
327 if (mount(jail_root
, jail_root
, "overlay", MS_NOATIME
, optsstr
))
328 goto upper_resolvconf_printf
;
332 upper_resolvconf_printf
:
333 free(upperresolvconf
);
346 static void pass_console(int console_fd
)
348 struct ubus_context
*child_ctx
= ubus_connect(NULL
);
349 static struct blob_buf req
;
355 blob_buf_init(&req
, 0);
356 blobmsg_add_string(&req
, "name", opts
.name
);
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");
365 ubus_free(child_ctx
);
368 static int create_dev_console(const char *jail_root
)
371 char dev_console_path
[PATH_MAX
];
372 int slave_console_fd
;
374 /* Open UNIX/98 virtual console */
375 console_fd
= posix_openpt(O_RDWR
| O_NOCTTY
);
379 console_fname
= ptsname(console_fd
);
380 DEBUG("got console fd %d and PTS client name %s\n", console_fd
, console_fname
);
385 unlockpt(console_fd
);
387 /* pass PTY master to procd */
388 pass_console(console_fd
);
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));
394 if (mount(console_fname
, dev_console_path
, "bind", MS_BIND
, NULL
))
397 /* use PTY slave for stdio */
398 slave_console_fd
= open(console_fname
, O_RDWR
); /* | O_NOCTTY */
399 if (slave_console_fd
< 0)
402 dup2(slave_console_fd
, 0);
403 dup2(slave_console_fd
, 1);
404 dup2(slave_console_fd
, 2);
405 close(slave_console_fd
);
407 INFO("using guest console %s\n", console_fname
);
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
;
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
,
427 static void run_hooklist(void);
428 static void hook_process_handler(struct uloop_process
*c
, int ret
)
430 uloop_timeout_cancel(&hook_process_timeout
);
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
);
437 DEBUG("hook (%d) exited with exit: %d\n", c
->pid
, hook_return_code
);
440 hook_return_code
= WTERMSIG(ret
);
441 ERROR("hook (%d) exited with signal: %d\n", c
->pid
, hook_return_code
);
448 static struct uloop_process hook_process
= {
449 .cb
= hook_process_handler
,
452 static void hook_process_timeout_cb(struct uloop_timeout
*t
)
454 DEBUG("hook process failed to stop, sending SIGKILL\n");
455 kill(hook_process
.pid
, SIGKILL
);
458 static void run_hooklist(void)
460 struct hook_execvpe
*hook
= *current_hook
;
464 return hook_return_cb();
466 DEBUG("executing hook %s\n", hook
->file
);
468 if (stat(hook
->file
, &s
))
469 hook_process_handler(&hook_process
, ENOENT
);
471 if (!((unsigned long)s
.st_mode
& (S_IXUSR
| S_IXGRP
| S_IXOTH
)))
472 hook_process_handler(&hook_process
, EPERM
);
475 hook_process
.pid
= fork();
476 if (hook_process
.pid
== 0) {
478 execve(hook
->file
, hook
->argv
, hook
->envp
);
479 ERROR("execve error %m\n");
481 } else if (hook_process
.pid
< 0) {
483 ERROR("hook fork error\n");
485 hook_process_handler(&hook_process
, errno
);
489 uloop_process_add(&hook_process
);
491 if (hook
->timeout
> 0)
492 uloop_timeout_set(&hook_process_timeout
, 1000 * hook
->timeout
);
496 DEBUG("uloop interrupted, killing jail process\n");
497 kill(hook_process
.pid
, SIGTERM
);
498 uloop_timeout_set(&hook_process_timeout
, 1000);
503 static void run_hooks(struct hook_execvpe
**hooklist
, hook_return_handler return_cb
)
508 current_hook
= hooklist
;
509 hook_return_cb
= return_cb
;
514 static int apply_sysctl(const char *jail_root
)
516 struct sysctl_val
**cur
;
517 char *procdir
, *fname
;
523 if (asprintf(&procdir
, "%s/proc", jail_root
) < 0)
526 mkdir(procdir
, 0700);
527 if (mount("proc", procdir
, "proc", MS_NOATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
, 0))
533 if (asprintf(&fname
, "%s/sys/%s", procdir
, (*cur
)->entry
) < 0)
536 DEBUG("sysctl: writing '%s' to %s\n", (*cur
)->value
, fname
);
538 f
= open(fname
, O_WRONLY
);
540 ERROR("sysctl: can't open %s\n", fname
);
544 if (write(f
, (*cur
)->value
, strlen((*cur
)->value
)) < 0) {
545 ERROR("sysctl: write to %s\n", fname
);
562 /* glibc defines makedev calling a function. make sure it's a pure macro */
563 #if defined(__GLIBC__)
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)) )
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 },
583 static int create_devices(void)
585 struct mknod_args
**cur
, *curdef
;
589 goto only_default_devices
;
595 /* don't allow devices outside of /dev */
596 if (strncmp(path
, "/dev", 4))
599 /* make sure parent folder exists */
600 tmp
= strrchr(path
, '/');
605 if (strcmp(path
, "/dev")) {
606 DEBUG("creating directory %s\n", path
);
612 DEBUG("creating %s (mode=%08o)\n", path
, (*cur
)->mode
);
615 if (mknod(path
, (*cur
)->mode
, (*cur
)->dev
))
618 /* change owner, if needed */
619 if (((*cur
)->uid
|| (*cur
)->gid
) &&
620 chown(path
, (*cur
)->uid
, (*cur
)->gid
))
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
)) {
632 continue; /* may already exist, eg. due to a bind-mount */
634 if ((curdef
->uid
|| curdef
->gid
) &&
635 chown(curdef
->path
, curdef
->uid
, curdef
->gid
))
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");
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)
657 char *overlaydir
= NULL
;
660 old_umask
= umask(0);
662 if (mkdtemp(jail_root
) == NULL
) {
663 ERROR("mkdtemp(%s) failed: %m\n", jail_root
);
667 if (apply_sysctl(jail_root
)) {
668 ERROR("failed to apply sysctl values\n");
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");
679 if (mount(opts
.extroot
, jail_root
, "bind", MS_BIND
, NULL
)) {
680 ERROR("extroot mount failed %m\n");
684 if (mount("tmpfs", jail_root
, "tmpfs", MS_NOATIME
, "mode=0755")) {
685 ERROR("tmpfs mount failed %m\n");
690 if (opts
.tmpoverlaysize
) {
691 char mountoptsstr
[] = "mode=0755,size=XXXXXXXX";
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
);
699 if (mount("tmpfs", tmpovdir
, "tmpfs", MS_NOATIME
,
701 ERROR("failed to mount tmpfs for overlay (size=%s)\n", opts
.tmpoverlaysize
);
704 overlaydir
= tmpovdir
;
708 overlaydir
= opts
.overlaydir
;
711 ret
= mount_overlay(jail_root
, overlaydir
);
716 if (chdir(jail_root
)) {
717 ERROR("chdir(%s) (jail_root) failed: %m\n", jail_root
);
721 if (mount_all(jail_root
)) {
722 ERROR("mount_all() failed\n");
727 create_dev_console(jail_root
);
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
];
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
);
739 (void) symlink("../dev/resolv.conf.d/resolv.conf.auto", jaillink
);
742 run_hooks(opts
.hooks
.createContainer
, enter_jail_fs
);
747 static bool exit_from_child
;
748 static void free_and_exit(int ret
)
750 if (!exit_from_child
&& opts
.ocibundle
)
753 if (!exit_from_child
&& parent_ctx
)
754 ubus_free(parent_ctx
);
756 free_opts(!exit_from_child
);
761 static void post_jail_fs(void);
762 static void enter_jail_fs(void)
764 char dirbuf
[sizeof(jail_root
) + 4];
766 snprintf(dirbuf
, sizeof(dirbuf
), "%s/old", jail_root
);
769 if (pivot_root(jail_root
, dirbuf
) == -1) {
770 ERROR("pivot_root(%s, %s) failed: %m\n", jail_root
, dirbuf
);
774 ERROR("chdir(/) (after pivot_root) failed: %m\n");
778 snprintf(dirbuf
, sizeof(dirbuf
), "/old%s", jail_root
);
779 umount2(dirbuf
, MNT_DETACH
);
781 if (opts
.tmpoverlaysize
) {
782 char tmpdirbuf
[sizeof(tmpovdir
) + 4];
783 snprintf(tmpdirbuf
, sizeof(tmpdirbuf
), "/old%s", tmpovdir
);
784 umount2(tmpdirbuf
, MNT_DETACH
);
788 umount2("/old", MNT_DETACH
);
791 if (create_devices()) {
792 ERROR("create_devices() failed\n");
796 mount(NULL
, "/", "bind", MS_REMOUNT
| MS_BIND
| MS_RDONLY
, 0);
802 static int write_uid_gid_map(pid_t child_pid
, bool gidmap
, char *mapstr
)
807 if (snprintf(map_path
, sizeof(map_path
), "/proc/%d/%s",
808 child_pid
, gidmap
?"gid_map":"uid_map") < 0)
811 if ((map_file
= open(map_path
, O_WRONLY
)) < 0)
814 if (dprintf(map_file
, "%s", mapstr
)) {
823 static int write_single_uid_gid_map(pid_t child_pid
, bool gidmap
, int id
)
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)
832 if ((map_file
= open(map_path
, O_WRONLY
)) < 0)
835 if (dprintf(map_file
, map_format
, 0, id
, 1) < 0) {
844 static int write_setgroups(pid_t child_pid
, bool allow
)
847 char setgroups_path
[64];
849 if (snprintf(setgroups_path
, sizeof(setgroups_path
), "/proc/%d/setgroups",
854 if ((setgroups_file
= open(setgroups_path
, O_WRONLY
)) < 0) {
858 if (dprintf(setgroups_file
, "%s", allow
?"allow":"deny") == -1) {
859 close(setgroups_file
);
863 close(setgroups_file
);
867 static void get_jail_user(int *user
, int *user_gid
, int *gr_gid
)
869 struct passwd
*p
= NULL
;
870 struct group
*g
= NULL
;
873 p
= getpwnam(opts
.user
);
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
);
880 *user_gid
= p
->pw_gid
;
887 g
= getgrnam(opts
.group
);
889 ERROR("failed to get gid for group %s: %m\n", opts
.group
);
890 free_and_exit(EXIT_FAILURE
);
898 static void set_jail_user(int pw_uid
, int user_gid
, int gr_gid
)
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
);
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
);
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
);
916 static int apply_rlimits(void)
920 for (resource
= 0; resource
< RLIM_NLIMITS
; ++resource
) {
921 if (opts
.rlimits
[resource
])
922 DEBUG("applying limits to resource %u\n", resource
);
924 if (opts
.rlimits
[resource
] &&
925 setrlimit(resource
, opts
.rlimits
[resource
]))
933 static char** build_envp(const char *seccomp
, char **ocienvp
)
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");
946 if (seccomp
&& !preload_lib
) {
947 ERROR("failed to add preload-lib to env\n");
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
;
959 envp
[count
++] = container_var
;
962 envp
[count
++] = debug_var
;
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
);
975 static void usage(void)
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");
1014 static int* get_namespace_fd(const unsigned int nstype
)
1018 return &opts
.setns
.pid
;
1020 return &opts
.setns
.net
;
1022 return &opts
.setns
.ns
;
1024 return &opts
.setns
.ipc
;
1026 return &opts
.setns
.uts
;
1028 return &opts
.setns
.user
;
1029 case CLONE_NEWCGROUP
:
1030 return &opts
.setns
.cgroup
;
1031 #ifdef CLONE_NEWTIME
1033 return &opts
.setns
.time
;
1040 static int setns_open(unsigned long nstype
)
1042 int *fd
= get_namespace_fd(nstype
);
1049 if (setns(*fd
, nstype
) == -1) {
1058 static int jail_running
= 0;
1059 static int jail_return_code
= 0;
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
,
1065 static void poststop(void);
1066 static void jail_process_handler(struct uloop_process
*c
, int ret
)
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
);
1073 jail_return_code
= WTERMSIG(ret
);
1074 INFO("jail (%d) exited with signal: %d\n", c
->pid
, jail_return_code
);
1080 static struct uloop_process jail_process
= {
1081 .cb
= jail_process_handler
,
1084 static void jail_process_timeout_cb(struct uloop_timeout
*t
)
1086 DEBUG("jail process failed to stop, sending SIGKILL\n");
1087 kill(jail_process
.pid
, SIGKILL
);
1090 static void jail_handle_signal(int signo
)
1093 DEBUG("forwarding signal %d to the hook process\n", signo
);
1094 kill(hook_process
.pid
, signo
);
1098 DEBUG("forwarding signal %d to the jailed process\n", signo
);
1099 kill(jail_process
.pid
, signo
);
1103 static void signals_init(void)
1108 sigfillset(&sigmask
);
1109 for (i
= 0; i
< _NSIG
; i
++) {
1110 struct sigaction s
= { 0 };
1112 if (!sigismember(&sigmask
, i
))
1114 if ((i
== SIGCHLD
) || (i
== SIGPIPE
) || (i
== SIGSEGV
))
1117 s
.sa_handler
= jail_handle_signal
;
1118 sigaction(i
, &s
, NULL
);
1122 static void pre_exec_jail(struct uloop_timeout
*t
);
1123 static struct uloop_timeout pre_exec_timeout
= {
1124 .cb
= pre_exec_jail
,
1128 static int exec_jail(void *arg
)
1132 exit_from_child
= true;
1133 prctl(PR_SET_SECUREBITS
, 0);
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
);
1148 if (write(pipes
[1], buf
, 1) < 1) {
1149 ERROR("can't write to parent\n");
1150 return EXIT_FAILURE
;
1153 if (read(pipes
[2], buf
, 1) < 1) {
1154 ERROR("can't read from parent\n");
1155 return EXIT_FAILURE
;
1157 if (buf
[0] != 'O') {
1158 ERROR("parent had an error, child exiting\n");
1159 return EXIT_FAILURE
;
1162 if (opts
.namespace & CLONE_NEWCGROUP
)
1163 unshare(CLONE_NEWCGROUP
);
1165 setns_open(CLONE_NEWCGROUP
);
1167 if ((opts
.namespace & CLONE_NEWUSER
) || (opts
.setns
.user
!= -1)) {
1168 if (setregid(0, 0) < 0) {
1170 free_and_exit(EXIT_FAILURE
);
1172 if (setreuid(0, 0) < 0) {
1174 free_and_exit(EXIT_FAILURE
);
1176 if (setgroups(0, NULL
) < 0) {
1177 ERROR("setgroups\n");
1178 free_and_exit(EXIT_FAILURE
);
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
);
1188 uloop_timeout_add(&pre_exec_timeout
);
1195 static void pre_exec_jail(struct uloop_timeout
*t
)
1197 if ((opts
.namespace & CLONE_NEWNS
) && build_jail_fs()) {
1198 ERROR("failed to build jail fs\n");
1199 free_and_exit(EXIT_FAILURE
);
1201 run_hooks(opts
.hooks
.createContainer
, post_jail_fs
);
1205 static void post_start_hook(void);
1206 static void post_jail_fs(void)
1210 if (read(pipes
[2], buf
, 1) < 1) {
1211 ERROR("can't read from parent\n");
1212 free_and_exit(EXIT_FAILURE
);
1214 if (buf
[0] != '!') {
1215 ERROR("parent had an error, child exiting\n");
1216 free_and_exit(EXIT_FAILURE
);
1220 run_hooks(opts
.hooks
.startContainer
, post_start_hook
);
1223 static void post_start_hook(void)
1225 int pw_uid
, pw_gid
, gr_gid
;
1228 * make sure setuid/setgid won't drop capabilities in case capabilities
1229 * have been specified explicitely.
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
);
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
);
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
);
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
);
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
);
1264 /* drop remaining capabilities to end up with specified sets */
1265 if (applyOCIcapabilities(opts
.capset
, 0))
1266 free_and_exit(EXIT_FAILURE
);
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
);
1273 char **envp
= build_envp(opts
.seccomp
, opts
.envp
);
1275 free_and_exit(EXIT_FAILURE
);
1277 if (opts
.cwd
&& chdir(opts
.cwd
))
1278 free_and_exit(EXIT_FAILURE
);
1280 if (opts
.ociseccomp
&& applyOCIlinuxseccomp(opts
.ociseccomp
))
1281 free_and_exit(EXIT_FAILURE
);
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
);
1289 execve(*opts
.jail_argv
, opts
.jail_argv
, envp
);
1291 /* we get there only if execve fails */
1292 ERROR("failed to execve %s: %m\n", *opts
.jail_argv
);
1296 static int ns_open_pid(const char *nstype
, const pid_t target_ns
)
1298 char pid_pid_path
[PATH_MAX
];
1300 snprintf(pid_pid_path
, sizeof(pid_pid_path
), "/proc/%u/ns/%s", target_ns
, nstype
);
1302 return open(pid_pid_path
, O_RDONLY
);
1305 static void netns_updown(pid_t pid
, bool start
)
1307 static struct blob_buf req
;
1313 blob_buf_init(&req
, 0);
1314 blobmsg_add_string(&req
, "jail", opts
.name
);
1315 blobmsg_add_u32(&req
, "pid", pid
);
1316 blobmsg_add_u8(&req
, "start", start
);
1318 if (ubus_lookup_id(parent_ctx
, "network", &id
) ||
1319 ubus_invoke(parent_ctx
, id
, "netns_updown", req
.head
, NULL
, NULL
, 3000))
1320 INFO("ubus request failed\n");
1322 blob_buf_free(&req
);
1325 static int parseOCIenvarray(struct blob_attr
*msg
, char ***envp
)
1327 struct blob_attr
*cur
;
1330 blobmsg_for_each_attr(cur
, msg
, rem
)
1334 *envp
= calloc(1 + sz
, sizeof(char*));
1343 blobmsg_for_each_attr(cur
, msg
, rem
)
1344 (*envp
)[sz
++] = strdup(blobmsg_get_string(cur
));
1358 static const struct blobmsg_policy oci_root_policy
[] = {
1359 [OCI_ROOT_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1360 [OCI_ROOT_READONLY
] = { "readonly", BLOBMSG_TYPE_BOOL
},
1363 static int parseOCIroot(const char *jsonfile
, struct blob_attr
*msg
)
1365 char extroot
[PATH_MAX
] = { 0 };
1366 struct blob_attr
*tb
[__OCI_ROOT_MAX
];
1370 blobmsg_parse(oci_root_policy
, __OCI_ROOT_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1372 if (!tb
[OCI_ROOT_PATH
])
1375 root_path
= blobmsg_get_string(tb
[OCI_ROOT_PATH
]);
1377 /* prepend bundle directory in case of relative paths */
1378 if (root_path
[0] != '/') {
1379 strncpy(extroot
, jsonfile
, PATH_MAX
- 1);
1381 cur
= strrchr(extroot
, '/');
1389 strncat(extroot
, root_path
, PATH_MAX
- (strlen(extroot
) + 1));
1391 /* follow symbolic link(s) */
1392 opts
.extroot
= realpath(extroot
, NULL
);
1396 if (tb
[OCI_ROOT_READONLY
])
1397 opts
.ronly
= blobmsg_get_bool(tb
[OCI_ROOT_READONLY
]);
1411 static const struct blobmsg_policy oci_hook_policy
[] = {
1412 [OCI_HOOK_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1413 [OCI_HOOK_ARGS
] = { "args", BLOBMSG_TYPE_ARRAY
},
1414 [OCI_HOOK_ENV
] = { "env", BLOBMSG_TYPE_ARRAY
},
1415 [OCI_HOOK_TIMEOUT
] = { "timeout", BLOBMSG_TYPE_INT32
},
1419 static int parseOCIhook(struct hook_execvpe
***hooklist
, struct blob_attr
*msg
)
1421 struct blob_attr
*tb
[__OCI_HOOK_MAX
];
1422 struct blob_attr
*cur
;
1426 blobmsg_for_each_attr(cur
, msg
, rem
)
1432 *hooklist
= calloc(idx
+ 1, sizeof(struct hook_execvpe
*));
1438 blobmsg_for_each_attr(cur
, msg
, rem
) {
1439 blobmsg_parse(oci_hook_policy
, __OCI_HOOK_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1441 if (!tb
[OCI_HOOK_PATH
]) {
1446 (*hooklist
)[idx
] = calloc(1, sizeof(struct hook_execvpe
));
1447 if (tb
[OCI_HOOK_ARGS
]) {
1448 ret
= parseOCIenvarray(tb
[OCI_HOOK_ARGS
], &((*hooklist
)[idx
]->argv
));
1452 (*hooklist
)[idx
]->argv
= calloc(2, sizeof(char *));
1453 ((*hooklist
)[idx
]->argv
)[0] = strdup(blobmsg_get_string(tb
[OCI_HOOK_PATH
]));
1454 ((*hooklist
)[idx
]->argv
)[1] = NULL
;
1458 if (tb
[OCI_HOOK_ENV
]) {
1459 ret
= parseOCIenvarray(tb
[OCI_HOOK_ENV
], &((*hooklist
)[idx
]->envp
));
1464 if (tb
[OCI_HOOK_TIMEOUT
])
1465 (*hooklist
)[idx
]->timeout
= blobmsg_get_u32(tb
[OCI_HOOK_TIMEOUT
]);
1467 (*hooklist
)[idx
]->file
= strdup(blobmsg_get_string(tb
[OCI_HOOK_PATH
]));
1472 (*hooklist
)[idx
] = NULL
;
1474 DEBUG("added %d hooks\n", idx
);
1479 free_hooklist(*hooklist
);
1488 OCI_HOOKS_CREATERUNTIME
,
1489 OCI_HOOKS_CREATECONTAINER
,
1490 OCI_HOOKS_STARTCONTAINER
,
1491 OCI_HOOKS_POSTSTART
,
1496 static const struct blobmsg_policy oci_hooks_policy
[] = {
1497 [OCI_HOOKS_PRESTART
] = { "prestart", BLOBMSG_TYPE_ARRAY
},
1498 [OCI_HOOKS_CREATERUNTIME
] = { "createRuntime", BLOBMSG_TYPE_ARRAY
},
1499 [OCI_HOOKS_CREATECONTAINER
] = { "createContainer", BLOBMSG_TYPE_ARRAY
},
1500 [OCI_HOOKS_STARTCONTAINER
] = { "startContainer", BLOBMSG_TYPE_ARRAY
},
1501 [OCI_HOOKS_POSTSTART
] = { "poststart", BLOBMSG_TYPE_ARRAY
},
1502 [OCI_HOOKS_POSTSTOP
] = { "poststop", BLOBMSG_TYPE_ARRAY
},
1505 static int parseOCIhooks(struct blob_attr
*msg
)
1507 struct blob_attr
*tb
[__OCI_HOOKS_MAX
];
1510 blobmsg_parse(oci_hooks_policy
, __OCI_HOOKS_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1512 if (tb
[OCI_HOOKS_PRESTART
])
1513 INFO("warning: ignoring deprecated prestart hook\n");
1515 if (tb
[OCI_HOOKS_CREATERUNTIME
]) {
1516 ret
= parseOCIhook(&opts
.hooks
.createRuntime
, tb
[OCI_HOOKS_CREATERUNTIME
]);
1521 if (tb
[OCI_HOOKS_CREATECONTAINER
]) {
1522 ret
= parseOCIhook(&opts
.hooks
.createContainer
, tb
[OCI_HOOKS_CREATECONTAINER
]);
1524 goto out_createruntime
;
1527 if (tb
[OCI_HOOKS_STARTCONTAINER
]) {
1528 ret
= parseOCIhook(&opts
.hooks
.startContainer
, tb
[OCI_HOOKS_STARTCONTAINER
]);
1530 goto out_createcontainer
;
1533 if (tb
[OCI_HOOKS_POSTSTART
]) {
1534 ret
= parseOCIhook(&opts
.hooks
.poststart
, tb
[OCI_HOOKS_POSTSTART
]);
1536 goto out_startcontainer
;
1539 if (tb
[OCI_HOOKS_POSTSTOP
]) {
1540 ret
= parseOCIhook(&opts
.hooks
.poststop
, tb
[OCI_HOOKS_POSTSTOP
]);
1548 free_hooklist(opts
.hooks
.poststart
);
1550 free_hooklist(opts
.hooks
.startContainer
);
1551 out_createcontainer
:
1552 free_hooklist(opts
.hooks
.createContainer
);
1554 free_hooklist(opts
.hooks
.createRuntime
);
1561 OCI_PROCESS_USER_UID
,
1562 OCI_PROCESS_USER_GID
,
1563 OCI_PROCESS_USER_UMASK
,
1564 OCI_PROCESS_USER_ADDITIONALGIDS
,
1565 __OCI_PROCESS_USER_MAX
,
1568 static const struct blobmsg_policy oci_process_user_policy
[] = {
1569 [OCI_PROCESS_USER_UID
] = { "uid", BLOBMSG_TYPE_INT32
},
1570 [OCI_PROCESS_USER_GID
] = { "gid", BLOBMSG_TYPE_INT32
},
1571 [OCI_PROCESS_USER_UMASK
] = { "umask", BLOBMSG_TYPE_INT32
},
1572 [OCI_PROCESS_USER_ADDITIONALGIDS
] = { "additionalGids", BLOBMSG_TYPE_ARRAY
},
1575 static int parseOCIprocessuser(struct blob_attr
*msg
) {
1576 struct blob_attr
*tb
[__OCI_PROCESS_USER_MAX
];
1577 struct blob_attr
*cur
;
1581 blobmsg_parse(oci_process_user_policy
, __OCI_PROCESS_USER_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1583 if (tb
[OCI_PROCESS_USER_UID
])
1584 opts
.pw_uid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_UID
]);
1586 if (tb
[OCI_PROCESS_USER_GID
]) {
1587 opts
.pw_gid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_GID
]);
1588 opts
.gr_gid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_GID
]);
1592 if (tb
[OCI_PROCESS_USER_ADDITIONALGIDS
]) {
1595 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_USER_ADDITIONALGIDS
], rem
) {
1597 if (has_gid
&& (blobmsg_get_u32(cur
) == opts
.gr_gid
))
1602 opts
.additional_gids
= calloc(gidcnt
+ has_gid
, sizeof(gid_t
));
1605 /* always add primary GID to set of GIDs if set */
1607 opts
.additional_gids
[gidcnt
++] = opts
.gr_gid
;
1609 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_USER_ADDITIONALGIDS
], rem
) {
1610 if (has_gid
&& (blobmsg_get_u32(cur
) == opts
.gr_gid
))
1612 opts
.additional_gids
[gidcnt
++] = blobmsg_get_u32(cur
);
1614 opts
.num_additional_gids
= gidcnt
;
1616 DEBUG("read %zu additional groups\n", gidcnt
);
1619 if (tb
[OCI_PROCESS_USER_UMASK
]) {
1620 opts
.umask
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_UMASK
]);
1621 opts
.set_umask
= true;
1628 OCI_PROCESS_RLIMIT_TYPE
,
1629 OCI_PROCESS_RLIMIT_SOFT
,
1630 OCI_PROCESS_RLIMIT_HARD
,
1631 __OCI_PROCESS_RLIMIT_MAX
,
1634 static const struct blobmsg_policy oci_process_rlimit_policy
[] = {
1635 [OCI_PROCESS_RLIMIT_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
1636 [OCI_PROCESS_RLIMIT_SOFT
] = { "soft", BLOBMSG_CAST_INT64
},
1637 [OCI_PROCESS_RLIMIT_HARD
] = { "hard", BLOBMSG_CAST_INT64
},
1640 /* from manpage GETRLIMIT(2) */
1641 static const char* const rlimit_names
[RLIM_NLIMITS
] = {
1643 [RLIMIT_CORE
] = "CORE",
1644 [RLIMIT_CPU
] = "CPU",
1645 [RLIMIT_DATA
] = "DATA",
1646 [RLIMIT_FSIZE
] = "FSIZE",
1647 [RLIMIT_LOCKS
] = "LOCKS",
1648 [RLIMIT_MEMLOCK
] = "MEMLOCK",
1649 [RLIMIT_MSGQUEUE
] = "MSGQUEUE",
1650 [RLIMIT_NICE
] = "NICE",
1651 [RLIMIT_NOFILE
] = "NOFILE",
1652 [RLIMIT_NPROC
] = "NPROC",
1653 [RLIMIT_RSS
] = "RSS",
1654 [RLIMIT_RTPRIO
] = "RTPRIO",
1655 [RLIMIT_RTTIME
] = "RTTIME",
1656 [RLIMIT_SIGPENDING
] = "SIGPENDING",
1657 [RLIMIT_STACK
] = "STACK",
1660 static int resolve_rlimit(char *type
) {
1661 unsigned int rltype
;
1663 for (rltype
= 0; rltype
< RLIM_NLIMITS
; ++rltype
)
1664 if (rlimit_names
[rltype
] &&
1665 !strncmp("RLIMIT_", type
, 7) &&
1666 !strcmp(rlimit_names
[rltype
], type
+ 7))
1673 static int parseOCIrlimit(struct blob_attr
*msg
)
1675 struct blob_attr
*tb
[__OCI_PROCESS_RLIMIT_MAX
];
1677 struct rlimit
*curlim
;
1679 blobmsg_parse(oci_process_rlimit_policy
, __OCI_PROCESS_RLIMIT_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1681 if (!tb
[OCI_PROCESS_RLIMIT_TYPE
] ||
1682 !tb
[OCI_PROCESS_RLIMIT_SOFT
] ||
1683 !tb
[OCI_PROCESS_RLIMIT_HARD
])
1686 limtype
= resolve_rlimit(blobmsg_get_string(tb
[OCI_PROCESS_RLIMIT_TYPE
]));
1691 if (opts
.rlimits
[limtype
])
1694 curlim
= malloc(sizeof(struct rlimit
));
1695 curlim
->rlim_cur
= blobmsg_cast_u64(tb
[OCI_PROCESS_RLIMIT_SOFT
]);
1696 curlim
->rlim_max
= blobmsg_cast_u64(tb
[OCI_PROCESS_RLIMIT_HARD
]);
1698 opts
.rlimits
[limtype
] = curlim
;
1705 OCI_PROCESS_CAPABILITIES
,
1708 OCI_PROCESS_OOMSCOREADJ
,
1709 OCI_PROCESS_NONEWPRIVILEGES
,
1710 OCI_PROCESS_RLIMITS
,
1711 OCI_PROCESS_TERMINAL
,
1716 static const struct blobmsg_policy oci_process_policy
[] = {
1717 [OCI_PROCESS_ARGS
] = { "args", BLOBMSG_TYPE_ARRAY
},
1718 [OCI_PROCESS_CAPABILITIES
] = { "capabilities", BLOBMSG_TYPE_TABLE
},
1719 [OCI_PROCESS_CWD
] = { "cwd", BLOBMSG_TYPE_STRING
},
1720 [OCI_PROCESS_ENV
] = { "env", BLOBMSG_TYPE_ARRAY
},
1721 [OCI_PROCESS_OOMSCOREADJ
] = { "oomScoreAdj", BLOBMSG_TYPE_INT32
},
1722 [OCI_PROCESS_NONEWPRIVILEGES
] = { "noNewPrivileges", BLOBMSG_TYPE_BOOL
},
1723 [OCI_PROCESS_RLIMITS
] = { "rlimits", BLOBMSG_TYPE_ARRAY
},
1724 [OCI_PROCESS_TERMINAL
] = { "terminal", BLOBMSG_TYPE_BOOL
},
1725 [OCI_PROCESS_USER
] = { "user", BLOBMSG_TYPE_TABLE
},
1729 static int parseOCIprocess(struct blob_attr
*msg
)
1731 struct blob_attr
*tb
[__OCI_PROCESS_MAX
], *cur
;
1734 blobmsg_parse(oci_process_policy
, __OCI_PROCESS_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1736 if (!tb
[OCI_PROCESS_ARGS
])
1739 res
= parseOCIenvarray(tb
[OCI_PROCESS_ARGS
], &opts
.jail_argv
);
1743 if (tb
[OCI_PROCESS_TERMINAL
])
1744 opts
.console
= blobmsg_get_bool(tb
[OCI_PROCESS_TERMINAL
]);
1746 if (tb
[OCI_PROCESS_NONEWPRIVILEGES
])
1747 opts
.no_new_privs
= blobmsg_get_bool(tb
[OCI_PROCESS_NONEWPRIVILEGES
]);
1749 if (tb
[OCI_PROCESS_CWD
])
1750 opts
.cwd
= strdup(blobmsg_get_string(tb
[OCI_PROCESS_CWD
]));
1752 if (tb
[OCI_PROCESS_ENV
]) {
1753 res
= parseOCIenvarray(tb
[OCI_PROCESS_ENV
], &opts
.envp
);
1758 if (tb
[OCI_PROCESS_USER
] && (res
= parseOCIprocessuser(tb
[OCI_PROCESS_USER
])))
1761 if (tb
[OCI_PROCESS_CAPABILITIES
] &&
1762 (res
= parseOCIcapabilities(&opts
.capset
, tb
[OCI_PROCESS_CAPABILITIES
])))
1765 if (tb
[OCI_PROCESS_RLIMITS
]) {
1766 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_RLIMITS
], rem
) {
1767 res
= parseOCIrlimit(cur
);
1773 if (tb
[OCI_PROCESS_OOMSCOREADJ
]) {
1774 opts
.oom_score_adj
= blobmsg_get_u32(tb
[OCI_PROCESS_OOMSCOREADJ
]);
1775 opts
.set_oom_score_adj
= true;
1782 OCI_LINUX_NAMESPACE_TYPE
,
1783 OCI_LINUX_NAMESPACE_PATH
,
1784 __OCI_LINUX_NAMESPACE_MAX
,
1787 static const struct blobmsg_policy oci_linux_namespace_policy
[] = {
1788 [OCI_LINUX_NAMESPACE_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
1789 [OCI_LINUX_NAMESPACE_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1792 static int resolve_nstype(char *type
) {
1793 if (!strcmp("pid", type
))
1794 return CLONE_NEWPID
;
1795 else if (!strcmp("network", type
))
1796 return CLONE_NEWNET
;
1797 else if (!strcmp("net", type
))
1798 return CLONE_NEWNET
;
1799 else if (!strcmp("mount", type
))
1801 else if (!strcmp("ipc", type
))
1802 return CLONE_NEWIPC
;
1803 else if (!strcmp("uts", type
))
1804 return CLONE_NEWUTS
;
1805 else if (!strcmp("user", type
))
1806 return CLONE_NEWUSER
;
1807 else if (!strcmp("cgroup", type
))
1808 return CLONE_NEWCGROUP
;
1809 #ifdef CLONE_NEWTIME
1810 else if (!strcmp("time", type
))
1811 return CLONE_NEWTIME
;
1817 static int parseOCIlinuxns(struct blob_attr
*msg
)
1819 struct blob_attr
*tb
[__OCI_LINUX_NAMESPACE_MAX
];
1824 blobmsg_parse(oci_linux_namespace_policy
, __OCI_LINUX_NAMESPACE_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1826 if (!tb
[OCI_LINUX_NAMESPACE_TYPE
])
1829 nstype
= resolve_nstype(blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]));
1833 if (opts
.namespace & nstype
)
1836 setns
= get_namespace_fd(nstype
);
1844 if (tb
[OCI_LINUX_NAMESPACE_PATH
]) {
1845 DEBUG("opening existing %s namespace from path %s\n",
1846 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]),
1847 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_PATH
]));
1849 fd
= open(blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_PATH
]), O_RDONLY
);
1851 return errno
?:ESTALE
;
1853 if (ioctl(fd
, NS_GET_NSTYPE
) != nstype
) {
1858 DEBUG("opened existing %s namespace got filehandler %u\n",
1859 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]),
1864 opts
.namespace |= nstype
;
1871 * join namespace of existing PID
1872 * The string argument is the reference PID followed by ':' and a
1873 * ',' separated list of namespaces to to join.
1875 static int jail_join_ns(char *arg
)
1880 char *tmp
, *etmp
, *nspath
;
1883 tmp
= strchr(arg
, ':');
1892 etmp
= strchr(tmp
, ',');
1896 nstype
= resolve_nstype(tmp
);
1900 if (opts
.namespace & nstype
)
1903 setns
= get_namespace_fd(nstype
);
1911 if (asprintf(&nspath
, "/proc/%d/ns/%s", pid
, tmp
) < 0)
1914 fd
= open(nspath
, O_RDONLY
);
1918 return errno
?:ESTALE
;
1931 static void get_jail_root_user(bool is_gidmap
, uint32_t container_id
, uint32_t host_id
, uint32_t size
)
1933 if (container_id
== 0 && size
>= 1)
1935 opts
.root_map_uid
= host_id
;
1939 OCI_LINUX_UIDGIDMAP_CONTAINERID
,
1940 OCI_LINUX_UIDGIDMAP_HOSTID
,
1941 OCI_LINUX_UIDGIDMAP_SIZE
,
1942 __OCI_LINUX_UIDGIDMAP_MAX
,
1945 static const struct blobmsg_policy oci_linux_uidgidmap_policy
[] = {
1946 [OCI_LINUX_UIDGIDMAP_CONTAINERID
] = { "containerID", BLOBMSG_TYPE_INT32
},
1947 [OCI_LINUX_UIDGIDMAP_HOSTID
] = { "hostID", BLOBMSG_TYPE_INT32
},
1948 [OCI_LINUX_UIDGIDMAP_SIZE
] = { "size", BLOBMSG_TYPE_INT32
},
1951 static int parseOCIuidgidmappings(struct blob_attr
*msg
, bool is_gidmap
)
1953 struct blob_attr
*tb
[__OCI_LINUX_UIDGIDMAP_MAX
];
1954 struct blob_attr
*cur
;
1957 size_t len
, pos
, totallen
= 0;
1959 blobmsg_for_each_attr(cur
, msg
, rem
) {
1960 blobmsg_parse(oci_linux_uidgidmap_policy
, __OCI_LINUX_UIDGIDMAP_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1962 if (!tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
] ||
1963 !tb
[OCI_LINUX_UIDGIDMAP_HOSTID
] ||
1964 !tb
[OCI_LINUX_UIDGIDMAP_SIZE
])
1968 totallen
+= snprintf(NULL
, 0, "%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
]));
1974 /* allocate combined mapping string */
1975 map
= malloc(totallen
+ 1);
1980 blobmsg_for_each_attr(cur
, msg
, rem
) {
1981 blobmsg_parse(oci_linux_uidgidmap_policy
, __OCI_LINUX_UIDGIDMAP_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1983 get_jail_root_user(is_gidmap
, blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
]),
1984 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_HOSTID
]),
1985 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_SIZE
]));
1987 /* write mapping line into pre-allocated string */
1988 len
= snprintf(&map
[pos
], totallen
+ 1, "%d %d %d\n",
1989 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
]),
1990 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_HOSTID
]),
1991 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_SIZE
]));
1996 assert(totallen
== 0);
2011 OCI_DEVICES_FILEMODE
,
2017 static const struct blobmsg_policy oci_devices_policy
[] = {
2018 [OCI_DEVICES_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
2019 [OCI_DEVICES_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
2020 [OCI_DEVICES_MAJOR
] = { "major", BLOBMSG_TYPE_INT32
},
2021 [OCI_DEVICES_MINOR
] = { "minor", BLOBMSG_TYPE_INT32
},
2022 [OCI_DEVICES_FILEMODE
] = { "fileMode", BLOBMSG_TYPE_INT32
},
2023 [OCI_DEVICES_UID
] = { "uid", BLOBMSG_TYPE_INT32
},
2024 [OCI_DEVICES_GID
] = { "uid", BLOBMSG_TYPE_INT32
},
2027 static mode_t
resolve_devtype(char *tstr
)
2029 if (!strcmp("c", tstr
) ||
2032 else if (!strcmp("b", tstr
))
2034 else if (!strcmp("p", tstr
))
2040 static int parseOCIdevices(struct blob_attr
*msg
)
2042 struct blob_attr
*tb
[__OCI_DEVICES_MAX
];
2043 struct blob_attr
*cur
;
2046 struct mknod_args
*tmp
;
2048 blobmsg_for_each_attr(cur
, msg
, rem
)
2051 opts
.devices
= calloc(cnt
+ 1, sizeof(struct mknod_args
*));
2054 blobmsg_for_each_attr(cur
, msg
, rem
) {
2055 blobmsg_parse(oci_devices_policy
, __OCI_DEVICES_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
2056 if (!tb
[OCI_DEVICES_TYPE
] ||
2057 !tb
[OCI_DEVICES_PATH
])
2060 tmp
= calloc(1, sizeof(struct mknod_args
));
2064 tmp
->mode
= resolve_devtype(blobmsg_get_string(tb
[OCI_DEVICES_TYPE
]));
2070 if (tmp
->mode
!= S_IFIFO
) {
2071 if (!tb
[OCI_DEVICES_MAJOR
] || !tb
[OCI_DEVICES_MINOR
]) {
2076 tmp
->dev
= makedev(blobmsg_get_u32(tb
[OCI_DEVICES_MAJOR
]),
2077 blobmsg_get_u32(tb
[OCI_DEVICES_MINOR
]));
2080 if (tb
[OCI_DEVICES_FILEMODE
]) {
2081 if (~(S_IRWXU
|S_IRWXG
|S_IRWXO
) & blobmsg_get_u32(tb
[OCI_DEVICES_FILEMODE
])) {
2086 tmp
->mode
|= blobmsg_get_u32(tb
[OCI_DEVICES_FILEMODE
]);
2088 tmp
->mode
|= (S_IRUSR
|S_IWUSR
); /* 0600 */
2091 tmp
->path
= strdup(blobmsg_get_string(tb
[OCI_DEVICES_PATH
]));
2093 if (tb
[OCI_DEVICES_UID
])
2094 tmp
->uid
= blobmsg_get_u32(tb
[OCI_DEVICES_UID
]);
2098 if (tb
[OCI_DEVICES_GID
])
2099 tmp
->gid
= blobmsg_get_u32(tb
[OCI_DEVICES_GID
]);
2103 DEBUG("read device %s (%s)\n", blobmsg_get_string(tb
[OCI_DEVICES_PATH
]), blobmsg_get_string(tb
[OCI_DEVICES_TYPE
]));
2104 opts
.devices
[cnt
++] = tmp
;
2107 opts
.devices
[cnt
] = NULL
;
2112 static int parseOCIsysctl(struct blob_attr
*msg
)
2114 struct blob_attr
*cur
;
2119 blobmsg_for_each_attr(cur
, msg
, rem
) {
2120 if (!blobmsg_name(cur
) || !blobmsg_get_string(cur
))
2129 opts
.sysctl
= calloc(cnt
+ 1, sizeof(struct sysctl_val
*));
2134 blobmsg_for_each_attr(cur
, msg
, rem
) {
2135 opts
.sysctl
[cnt
] = malloc(sizeof(struct sysctl_val
));
2136 if (!opts
.sysctl
[cnt
])
2139 /* replace '.' with '/' in entry name */
2140 tc
= tmp
= strdup(blobmsg_name(cur
));
2141 while ((tc
= strchr(tc
, '.')))
2144 opts
.sysctl
[cnt
]->value
= strdup(blobmsg_get_string(cur
));
2145 opts
.sysctl
[cnt
]->entry
= tmp
;
2150 opts
.sysctl
[cnt
] = NULL
;
2157 OCI_LINUX_CGROUPSPATH
,
2158 OCI_LINUX_RESOURCES
,
2161 OCI_LINUX_NAMESPACES
,
2163 OCI_LINUX_UIDMAPPINGS
,
2164 OCI_LINUX_GIDMAPPINGS
,
2165 OCI_LINUX_MASKEDPATHS
,
2166 OCI_LINUX_READONLYPATHS
,
2167 OCI_LINUX_ROOTFSPROPAGATION
,
2171 static const struct blobmsg_policy oci_linux_policy
[] = {
2172 [OCI_LINUX_CGROUPSPATH
] = { "cgroupsPath", BLOBMSG_TYPE_STRING
},
2173 [OCI_LINUX_RESOURCES
] = { "resources", BLOBMSG_TYPE_TABLE
},
2174 [OCI_LINUX_SECCOMP
] = { "seccomp", BLOBMSG_TYPE_TABLE
},
2175 [OCI_LINUX_SYSCTL
] = { "sysctl", BLOBMSG_TYPE_TABLE
},
2176 [OCI_LINUX_NAMESPACES
] = { "namespaces", BLOBMSG_TYPE_ARRAY
},
2177 [OCI_LINUX_DEVICES
] = { "devices", BLOBMSG_TYPE_ARRAY
},
2178 [OCI_LINUX_UIDMAPPINGS
] = { "uidMappings", BLOBMSG_TYPE_ARRAY
},
2179 [OCI_LINUX_GIDMAPPINGS
] = { "gidMappings", BLOBMSG_TYPE_ARRAY
},
2180 [OCI_LINUX_MASKEDPATHS
] = { "maskedPaths", BLOBMSG_TYPE_ARRAY
},
2181 [OCI_LINUX_READONLYPATHS
] = { "readonlyPaths", BLOBMSG_TYPE_ARRAY
},
2182 [OCI_LINUX_ROOTFSPROPAGATION
] = { "rootfsPropagation", BLOBMSG_TYPE_STRING
},
2185 static int parseOCIlinux(struct blob_attr
*msg
)
2187 struct blob_attr
*tb
[__OCI_LINUX_MAX
];
2188 struct blob_attr
*cur
;
2192 char cgfullpath
[256] = "/sys/fs/cgroup";
2194 blobmsg_parse(oci_linux_policy
, __OCI_LINUX_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
2196 if (tb
[OCI_LINUX_NAMESPACES
]) {
2197 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_NAMESPACES
], rem
) {
2198 res
= parseOCIlinuxns(cur
);
2204 if (tb
[OCI_LINUX_UIDMAPPINGS
]) {
2205 res
= parseOCIuidgidmappings(tb
[OCI_LINUX_GIDMAPPINGS
], 0);
2210 if (tb
[OCI_LINUX_GIDMAPPINGS
]) {
2211 res
= parseOCIuidgidmappings(tb
[OCI_LINUX_GIDMAPPINGS
], 1);
2216 if (tb
[OCI_LINUX_READONLYPATHS
]) {
2217 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_READONLYPATHS
], rem
) {
2218 res
= add_mount(NULL
, blobmsg_get_string(cur
), NULL
, MS_BIND
| MS_REC
| MS_RDONLY
, 0, NULL
, 0);
2224 if (tb
[OCI_LINUX_MASKEDPATHS
]) {
2225 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_MASKEDPATHS
], rem
) {
2226 res
= add_mount((void *)(-1), blobmsg_get_string(cur
), NULL
, 0, 0, NULL
, 0);
2232 if (tb
[OCI_LINUX_SYSCTL
]) {
2233 res
= parseOCIsysctl(tb
[OCI_LINUX_SYSCTL
]);
2238 if (tb
[OCI_LINUX_SECCOMP
]) {
2239 opts
.ociseccomp
= parseOCIlinuxseccomp(tb
[OCI_LINUX_SECCOMP
]);
2240 if (!opts
.ociseccomp
)
2244 if (tb
[OCI_LINUX_DEVICES
]) {
2245 res
= parseOCIdevices(tb
[OCI_LINUX_DEVICES
]);
2250 if (tb
[OCI_LINUX_CGROUPSPATH
]) {
2251 cgpath
= blobmsg_get_string(tb
[OCI_LINUX_CGROUPSPATH
]);
2252 if (cgpath
[0] == '/') {
2253 if (strlen(cgpath
) + 1 >= (sizeof(cgfullpath
) - strlen(cgfullpath
)))
2256 strcat(cgfullpath
, cgpath
);
2258 strcat(cgfullpath
, "/containers/");
2259 if (strlen(opts
.name
) + strlen(cgpath
) + 2 >= (sizeof(cgfullpath
) - strlen(cgfullpath
)))
2262 strcat(cgfullpath
, opts
.name
); /* should be container name rather than jail name */
2263 strcat(cgfullpath
, "/");
2264 strcat(cgfullpath
, cgpath
);
2267 strcat(cgfullpath
, "/containers/");
2268 if (2 * strlen(opts
.name
) + 2 >= (sizeof(cgfullpath
) - strlen(cgfullpath
)))
2271 strcat(cgfullpath
, opts
.name
); /* should be container name rather than jail name */
2272 strcat(cgfullpath
, "/");
2273 strcat(cgfullpath
, opts
.name
); /* should be container instance name rather than jail name */
2276 cgroups_init(cgfullpath
);
2278 if (tb
[OCI_LINUX_RESOURCES
]) {
2279 res
= parseOCIlinuxcgroups(tb
[OCI_LINUX_RESOURCES
]);
2299 static const struct blobmsg_policy oci_policy
[] = {
2300 [OCI_VERSION
] = { "ociVersion", BLOBMSG_TYPE_STRING
},
2301 [OCI_HOSTNAME
] = { "hostname", BLOBMSG_TYPE_STRING
},
2302 [OCI_PROCESS
] = { "process", BLOBMSG_TYPE_TABLE
},
2303 [OCI_ROOT
] = { "root", BLOBMSG_TYPE_TABLE
},
2304 [OCI_MOUNTS
] = { "mounts", BLOBMSG_TYPE_ARRAY
},
2305 [OCI_HOOKS
] = { "hooks", BLOBMSG_TYPE_TABLE
},
2306 [OCI_LINUX
] = { "linux", BLOBMSG_TYPE_TABLE
},
2307 [OCI_ANNOTATIONS
] = { "annotations", BLOBMSG_TYPE_TABLE
},
2310 static int parseOCI(const char *jsonfile
)
2312 struct blob_attr
*tb
[__OCI_MAX
];
2313 struct blob_attr
*cur
;
2317 blob_buf_init(&ocibuf
, 0);
2319 if (!blobmsg_add_json_from_file(&ocibuf
, jsonfile
)) {
2324 blobmsg_parse(oci_policy
, __OCI_MAX
, tb
, blob_data(ocibuf
.head
), blob_len(ocibuf
.head
));
2326 if (!tb
[OCI_VERSION
]) {
2331 if (strncmp("1.0", blobmsg_get_string(tb
[OCI_VERSION
]), 3)) {
2332 ERROR("unsupported ociVersion %s\n", blobmsg_get_string(tb
[OCI_VERSION
]));
2337 if (tb
[OCI_HOSTNAME
])
2338 opts
.hostname
= strdup(blobmsg_get_string(tb
[OCI_HOSTNAME
]));
2340 if (!tb
[OCI_PROCESS
]) {
2345 if ((res
= parseOCIprocess(tb
[OCI_PROCESS
])))
2348 if (!tb
[OCI_ROOT
]) {
2352 if ((res
= parseOCIroot(jsonfile
, tb
[OCI_ROOT
])))
2355 if (!tb
[OCI_MOUNTS
]) {
2360 blobmsg_for_each_attr(cur
, tb
[OCI_MOUNTS
], rem
)
2361 if ((res
= parseOCImount(cur
)))
2364 if (tb
[OCI_LINUX
] && (res
= parseOCIlinux(tb
[OCI_LINUX
])))
2367 if (tb
[OCI_HOOKS
] && (res
= parseOCIhooks(tb
[OCI_HOOKS
])))
2370 if (tb
[OCI_ANNOTATIONS
])
2371 opts
.annotations
= blob_memdup(tb
[OCI_ANNOTATIONS
]);
2374 blob_buf_free(&ocibuf
);
2379 static int set_oom_score_adj(void)
2384 if (!opts
.set_oom_score_adj
)
2387 snprintf(fname
, sizeof(fname
), "/proc/%u/oom_score_adj", jail_process
.pid
);
2388 f
= open(fname
, O_WRONLY
| O_TRUNC
);
2392 dprintf(f
, "%d", opts
.oom_score_adj
);
2406 static int jail_oci_state
= OCI_STATE_CREATED
;
2407 static void pipe_send_start_container(struct uloop_timeout
*t
);
2408 static struct uloop_timeout start_container_timeout
= {
2409 .cb
= pipe_send_start_container
,
2412 static int handle_start(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2413 struct ubus_request_data
*req
, const char *method
,
2414 struct blob_attr
*msg
)
2416 if (jail_oci_state
!= OCI_STATE_CREATED
)
2417 return UBUS_STATUS_INVALID_ARGUMENT
;
2419 uloop_timeout_add(&start_container_timeout
);
2421 return UBUS_STATUS_OK
;
2424 static struct blob_buf bb
;
2425 static int handle_state(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2426 struct ubus_request_data
*req
, const char *method
,
2427 struct blob_attr
*msg
)
2431 switch (jail_oci_state
) {
2432 case OCI_STATE_CREATING
:
2433 statusstr
= "creating";
2435 case OCI_STATE_CREATED
:
2436 statusstr
= "created";
2438 case OCI_STATE_RUNNING
:
2439 statusstr
= "running";
2441 case OCI_STATE_STOPPED
:
2442 statusstr
= "stopped";
2445 statusstr
= "unknown";
2448 blob_buf_init(&bb
, 0);
2449 blobmsg_add_string(&bb
, "ociVersion", OCI_VERSION_STRING
);
2450 blobmsg_add_string(&bb
, "id", opts
.name
);
2451 blobmsg_add_string(&bb
, "status", statusstr
);
2452 if (jail_oci_state
== OCI_STATE_CREATED
||
2453 jail_oci_state
== OCI_STATE_RUNNING
)
2454 blobmsg_add_u32(&bb
, "pid", jail_process
.pid
);
2456 blobmsg_add_string(&bb
, "bundle", opts
.ocibundle
);
2458 if (opts
.annotations
)
2459 blobmsg_add_blob(&bb
, opts
.annotations
);
2461 ubus_send_reply(ctx
, req
, bb
.head
);
2463 return UBUS_STATUS_OK
;
2467 CONTAINER_KILL_ATTR_SIGNAL
,
2468 __CONTAINER_KILL_ATTR_MAX
,
2471 static const struct blobmsg_policy container_kill_attrs
[__CONTAINER_KILL_ATTR_MAX
] = {
2472 [CONTAINER_KILL_ATTR_SIGNAL
] = { "signal", BLOBMSG_TYPE_INT32
},
2476 container_handle_kill(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2477 struct ubus_request_data
*req
, const char *method
,
2478 struct blob_attr
*msg
)
2480 struct blob_attr
*tb
[__CONTAINER_KILL_ATTR_MAX
], *cur
;
2483 blobmsg_parse(container_kill_attrs
, __CONTAINER_KILL_ATTR_MAX
, tb
, blobmsg_data(msg
), blobmsg_data_len(msg
));
2485 cur
= tb
[CONTAINER_KILL_ATTR_SIGNAL
];
2487 sig
= blobmsg_get_u32(cur
);
2489 if (jail_oci_state
== OCI_STATE_CREATING
)
2490 return UBUS_STATUS_NOT_FOUND
;
2492 if (kill(jail_process
.pid
, sig
) == 0)
2496 case EINVAL
: return UBUS_STATUS_INVALID_ARGUMENT
;
2497 case EPERM
: return UBUS_STATUS_PERMISSION_DENIED
;
2498 case ESRCH
: return UBUS_STATUS_NOT_FOUND
;
2501 return UBUS_STATUS_UNKNOWN_ERROR
;
2505 jail_writepid(pid_t pid
)
2512 _pidfile
= fopen(opts
.pidfile
, "w");
2513 if (_pidfile
== NULL
)
2516 if (fprintf(_pidfile
, "%d\n", pid
) < 0) {
2521 if (fclose(_pidfile
))
2527 static int checkpath(const char *path
)
2529 int dirfd
= open(path
, O_RDONLY
| O_DIRECTORY
| O_CLOEXEC
);
2531 ERROR("path %s open failed %m\n", path
);
2539 static struct ubus_method container_methods
[] = {
2540 UBUS_METHOD_NOARG("start", handle_start
),
2541 UBUS_METHOD_NOARG("state", handle_state
),
2542 UBUS_METHOD("kill", container_handle_kill
, container_kill_attrs
),
2545 static struct ubus_object_type container_object_type
=
2546 UBUS_OBJECT_TYPE("container", container_methods
);
2548 static struct ubus_object container_object
= {
2549 .type
= &container_object_type
,
2550 .methods
= container_methods
,
2551 .n_methods
= ARRAY_SIZE(container_methods
),
2554 static void post_main(struct uloop_timeout
*t
);
2555 static struct uloop_timeout post_main_timeout
= {
2558 static int netns_fd
;
2559 static int pidns_fd
;
2560 #ifdef CLONE_NEWTIME
2561 static int timens_fd
;
2563 static void post_create_runtime(void);
2564 int main(int argc
, char **argv
)
2566 uid_t uid
= getuid();
2567 const char log
[] = "/dev/log";
2568 const char ubus
[] = "/var/run/ubus/ubus.sock";
2569 int ret
= EXIT_FAILURE
;
2574 ERROR("not root, aborting: %m\n");
2575 return EXIT_FAILURE
;
2578 /* those are filehandlers, so -1 indicates unused */
2579 opts
.setns
.pid
= -1;
2580 opts
.setns
.net
= -1;
2582 opts
.setns
.ipc
= -1;
2583 opts
.setns
.uts
= -1;
2584 opts
.setns
.user
= -1;
2585 opts
.setns
.cgroup
= -1;
2586 #ifdef CLONE_NEWTIME
2587 opts
.setns
.time
= -1;
2592 init_library_search();
2594 exit_from_child
= false;
2596 while ((ch
= getopt(argc
, argv
, OPT_ARGS
)) != -1) {
2599 debug
= atoi(optarg
);
2602 opts
.namespace |= CLONE_NEWNS
;
2606 opts
.namespace |= CLONE_NEWNS
;
2610 opts
.namespace |= CLONE_NEWUSER
;
2613 opts
.namespace |= CLONE_NEWCGROUP
;
2616 opts
.extroot
= realpath(optarg
, NULL
);
2619 opts
.namespace |= CLONE_NEWNS
;
2623 opts
.seccomp
= optarg
;
2624 add_mount_bind(optarg
, 1, -1);
2627 opts
.capabilities
= optarg
;
2630 opts
.no_new_privs
= 1;
2636 opts
.namespace |= CLONE_NEWNET
;
2639 opts
.namespace |= CLONE_NEWUTS
;
2640 opts
.hostname
= strdup(optarg
);
2643 jail_join_ns(optarg
);
2646 opts
.namespace |= CLONE_NEWNS
;
2647 tmp
= strchr(optarg
, ':');
2650 add_2paths_and_deps(optarg
, tmp
, 1, 0, 0);
2652 add_path_and_deps(optarg
, 1, 0, 0);
2656 opts
.namespace |= CLONE_NEWNS
;
2657 tmp
= strchr(optarg
, ':');
2660 add_2paths_and_deps(optarg
, tmp
, 0, 0, 0);
2662 add_path_and_deps(optarg
, 0, 0, 0);
2666 opts
.namespace |= CLONE_NEWNS
;
2667 add_mount_bind(ubus
, 0, -1);
2670 opts
.namespace |= CLONE_NEWNS
;
2671 add_mount_bind(log
, 0, -1);
2677 opts
.group
= optarg
;
2680 opts
.overlaydir
= realpath(optarg
, NULL
);
2683 opts
.tmpoverlaysize
= optarg
;
2686 opts
.require_jail
= 1;
2692 opts
.ocibundle
= optarg
;
2695 opts
.immediately
= true;
2698 opts
.pidfile
= optarg
;
2703 if (opts
.namespace && !opts
.ocibundle
)
2704 opts
.namespace |= CLONE_NEWIPC
| CLONE_NEWPID
;
2707 * uid in parent user namespace representing root user in new
2708 * user namespace, defaults to nobody unless specified in uidMappings
2710 opts
.root_map_uid
= 65534;
2712 if (opts
.capabilities
&& parseOCIcapabilities_from_file(&opts
.capset
, opts
.capabilities
)) {
2713 ERROR("failed to read capabilities from file %s\n", opts
.capabilities
);
2718 if (opts
.ocibundle
) {
2723 ERROR("OCI bundle needs a named jail\n");
2727 if (asprintf(&jsonfile
, "%s/config.json", opts
.ocibundle
) < 0) {
2731 ocires
= parseOCI(jsonfile
);
2734 ERROR("parsing of OCI JSON spec has failed: %s (%d)\n", strerror(ocires
), ocires
);
2740 if (opts
.namespace & CLONE_NEWNET
) {
2742 ERROR("netns needs a named jail\n");
2749 if (opts
.tmpoverlaysize
&& strlen(opts
.tmpoverlaysize
) > 8) {
2750 ERROR("size parameter too long: \"%s\"\n", opts
.tmpoverlaysize
);
2755 if (opts
.extroot
&& checkpath(opts
.extroot
)) {
2756 ERROR("invalid rootfs path '%s'", opts
.extroot
);
2761 if (opts
.overlaydir
&& checkpath(opts
.overlaydir
)) {
2762 ERROR("invalid rootfs overlay path '%s'", opts
.overlaydir
);
2767 /* no <binary> param found */
2768 if (!opts
.ocibundle
&& (argc
- optind
< 1)) {
2773 if (!(opts
.ocibundle
||opts
.namespace||opts
.capabilities
||opts
.seccomp
||
2774 (opts
.setns
.net
!= -1) ||
2775 (opts
.setns
.ns
!= -1) ||
2776 (opts
.setns
.ipc
!= -1) ||
2777 (opts
.setns
.uts
!= -1) ||
2778 (opts
.setns
.user
!= -1) ||
2779 (opts
.setns
.cgroup
!= -1))) {
2780 ERROR("Not using namespaces, capabilities or seccomp !!!\n\n");
2785 DEBUG("Using namespaces(0x%08x), capabilities(%d), seccomp(%d)\n",
2788 opts
.seccomp
!= 0 || opts
.ociseccomp
!= 0);
2793 parent_ctx
= ubus_connect(NULL
);
2794 ubus_add_uloop(parent_ctx
);
2796 if (opts
.ocibundle
) {
2798 if (asprintf(&objname
, "container.%s", opts
.name
) < 0) {
2803 container_object
.name
= objname
;
2804 ret
= ubus_add_object(parent_ctx
, &container_object
);
2806 ERROR("Failed to add object: %s\n", ubus_strerror(ret
));
2812 /* deliberately not using 'else' on unrelated conditional branches */
2813 if (!opts
.ocibundle
) {
2814 /* allocate NULL-terminated array for argv */
2815 opts
.jail_argv
= calloc(1 + argc
- optind
, sizeof(void *));
2816 if (!opts
.jail_argv
) {
2820 for (size_t s
= optind
; s
< argc
; s
++)
2821 opts
.jail_argv
[s
- optind
] = strdup(argv
[s
]);
2823 if (opts
.namespace & CLONE_NEWUSER
)
2824 get_jail_user(&opts
.pw_uid
, &opts
.pw_gid
, &opts
.gr_gid
);
2827 if (!opts
.extroot
) {
2828 if (opts
.namespace && add_path_and_deps(*opts
.jail_argv
, 1, -1, 0)) {
2829 ERROR("failed to load dependencies\n");
2835 if (opts
.namespace && opts
.seccomp
&& add_path_and_deps("libpreload-seccomp.so", 1, -1, 1)) {
2836 ERROR("failed to load libpreload-seccomp.so\n");
2838 if (opts
.require_jail
) {
2844 uloop_timeout_add(&post_main_timeout
);
2856 static void post_main(struct uloop_timeout
*t
)
2858 if (apply_rlimits()) {
2859 ERROR("error applying resource limits\n");
2860 free_and_exit(EXIT_FAILURE
);
2864 prctl(PR_SET_NAME
, opts
.name
, NULL
, NULL
, NULL
);
2866 if (pipe(&pipes
[0]) < 0 || pipe(&pipes
[2]) < 0)
2869 if (has_namespaces()) {
2870 if (opts
.namespace & CLONE_NEWNS
) {
2871 if (!opts
.extroot
&& (opts
.user
|| opts
.group
)) {
2872 add_mount_bind("/etc/passwd", 1, -1);
2873 add_mount_bind("/etc/group", 1, -1);
2876 #if defined(__GLIBC__)
2878 add_mount_bind("/etc/nsswitch.conf", 1, -1);
2880 if (opts
.setns
.ns
== -1) {
2881 if (!(opts
.namespace & CLONE_NEWNET
)) {
2882 add_mount_bind("/etc/resolv.conf", 1, 0);
2884 /* new mount namespace to provide /dev/resolv.conf.d */
2885 char hostdir
[PATH_MAX
];
2887 snprintf(hostdir
, PATH_MAX
, "/tmp/resolv.conf-%s.d", opts
.name
);
2888 mkdir_p(hostdir
, 0755);
2889 add_mount(hostdir
, "/dev/resolv.conf.d", NULL
,
2890 MS_BIND
| MS_NOEXEC
| MS_NOATIME
| MS_NOSUID
| MS_NODEV
| MS_RDONLY
, 0, NULL
, 0);
2893 /* default mounts */
2894 add_mount(NULL
, "/dev", "tmpfs", MS_NOATIME
| MS_NOEXEC
| MS_NOSUID
, 0, "size=1M", -1);
2895 add_mount(NULL
, "/dev/pts", "devpts", MS_NOATIME
| MS_NOEXEC
| MS_NOSUID
, 0, "newinstance,ptmxmode=0666,mode=0620,gid=5", 0);
2897 if (opts
.procfs
|| opts
.ocibundle
) {
2898 add_mount("proc", "/proc", "proc", MS_NOATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
, 0, NULL
, -1);
2901 * hack to make /proc/sys/net read-write while the rest of /proc/sys is read-only
2902 * which cannot be expressed with OCI spec, but happends to be very useful.
2903 * Only apply it if '/proc/sys' is not already listed as mount, maskedPath or
2905 * If not running in a new network namespace, only make /proc/sys read-only.
2906 * If running in a new network namespace, temporarily stash (ie. mount-bind)
2907 * /proc/sys/net into (totally unrelated, but surely existing) /proc/self/net.
2908 * Then we mount-bind /proc/sys read-only and then mount-move /proc/self/net into
2910 * This works because mounts are executed in incrementing strcmp() order and
2911 * /proc/self/net appears there before /proc/sys/net and hence the operation
2912 * succeeds as the bind-mount of /proc/self/net is performed first and then
2913 * move-mount of /proc/sys/net follows because 'e' preceeds 'y' in the ASCII
2914 * table (and in the alphabet).
2916 if (!add_mount(NULL
, "/proc/sys", NULL
, MS_BIND
| MS_RDONLY
, 0, NULL
, -1))
2917 if (opts
.namespace & CLONE_NEWNET
)
2918 if (!add_mount_inner("/proc/self/net", "/proc/sys/net", NULL
, MS_MOVE
, 0, NULL
, -1))
2919 add_mount_inner("/proc/sys/net", "/proc/self/net", NULL
, MS_BIND
, 0, NULL
, -1);
2922 if (opts
.sysfs
|| opts
.ocibundle
)
2923 add_mount("sysfs", "/sys", "sysfs", MS_RELATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
| MS_RDONLY
, 0, NULL
, -1);
2926 add_mount("shm", "/dev/shm", "tmpfs", MS_NOSUID
| MS_NOEXEC
| MS_NODEV
, 0, "mode=1777", -1);
2930 if (opts
.setns
.pid
!= -1) {
2931 pidns_fd
= ns_open_pid("pid", getpid());
2932 setns_open(CLONE_NEWPID
);
2937 #ifdef CLONE_NEWTIME
2938 if (opts
.setns
.time
!= -1) {
2939 timens_fd
= ns_open_pid("time", getpid());
2940 setns_open(CLONE_NEWTIME
);
2946 if (opts
.namespace & CLONE_NEWUSER
) {
2947 if (prctl(PR_SET_SECUREBITS
, SECBIT_NO_SETUID_FIXUP
)) {
2948 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
2949 free_and_exit(EXIT_FAILURE
);
2951 if (seteuid(opts
.root_map_uid
)) {
2952 ERROR("seteuid(%d) failed: %m\n", opts
.root_map_uid
);
2953 free_and_exit(EXIT_FAILURE
);
2957 jail_process
.pid
= clone(exec_jail
, child_stack
+ STACK_SIZE
, SIGCHLD
| (opts
.namespace & (~CLONE_NEWCGROUP
)), NULL
);
2959 jail_process
.pid
= fork();
2962 if (jail_process
.pid
> 0) {
2963 /* parent process */
2966 uloop_process_add(&jail_process
);
2969 ERROR("seteuid(%d) failed: %m\n", opts
.root_map_uid
);
2970 free_and_exit(EXIT_FAILURE
);
2973 prctl(PR_SET_SECUREBITS
, 0);
2975 if (pidns_fd
!= -1) {
2976 setns(pidns_fd
, CLONE_NEWPID
);
2979 #ifdef CLONE_NEWTIME
2980 if (timens_fd
!= -1) {
2981 setns(timens_fd
, CLONE_NEWTIME
);
2985 if (opts
.setns
.net
!= -1)
2986 close(opts
.setns
.net
);
2987 if (opts
.setns
.ns
!= -1)
2988 close(opts
.setns
.ns
);
2989 if (opts
.setns
.ipc
!= -1)
2990 close(opts
.setns
.ipc
);
2991 if (opts
.setns
.uts
!= -1)
2992 close(opts
.setns
.uts
);
2993 if (opts
.setns
.user
!= -1)
2994 close(opts
.setns
.user
);
2995 if (opts
.setns
.cgroup
!= -1)
2996 close(opts
.setns
.cgroup
);
2999 if (read(pipes
[0], sig_buf
, 1) < 1) {
3000 ERROR("can't read from child\n");
3004 set_oom_score_adj();
3007 cgroups_apply(jail_process
.pid
);
3009 if (opts
.namespace & CLONE_NEWUSER
) {
3010 if (write_setgroups(jail_process
.pid
, true)) {
3011 ERROR("can't write setgroups\n");
3015 bool has_gr
= (opts
.gr_gid
!= -1);
3016 if (opts
.pw_uid
!= -1) {
3017 write_single_uid_gid_map(jail_process
.pid
, 0, opts
.pw_uid
);
3018 write_single_uid_gid_map(jail_process
.pid
, 1, has_gr
?opts
.gr_gid
:opts
.pw_gid
);
3020 write_single_uid_gid_map(jail_process
.pid
, 0, 65534);
3021 write_single_uid_gid_map(jail_process
.pid
, 1, has_gr
?opts
.gr_gid
:65534);
3024 write_uid_gid_map(jail_process
.pid
, 0, opts
.uidmap
);
3026 write_uid_gid_map(jail_process
.pid
, 1, opts
.gidmap
);
3030 if (opts
.namespace & CLONE_NEWNET
) {
3031 jail_network_start(parent_ctx
, opts
.name
, jail_process
.pid
);
3032 netns_fd
= ns_open_pid("net", jail_process
.pid
);
3033 netns_updown(jail_process
.pid
, true);
3036 if (jail_writepid(jail_process
.pid
)) {
3037 ERROR("failed to write pidfile: %m\n");
3040 } else if (jail_process
.pid
== 0) {
3041 /* fork child process */
3042 free_and_exit(exec_jail(NULL
));
3044 ERROR("failed to clone/fork: %m\n");
3045 free_and_exit(EXIT_FAILURE
);
3047 run_hooks(opts
.hooks
.createRuntime
, post_create_runtime
);
3050 static void post_poststart(void);
3051 static void post_create_runtime(void)
3056 if (write(pipes
[3], sig_buf
, 1) < 0) {
3057 ERROR("can't write to child\n");
3061 jail_oci_state
= OCI_STATE_CREATED
;
3062 if (opts
.ocibundle
&& !opts
.immediately
)
3063 uloop_run(); /* wait for 'start' command via ubus */
3065 pipe_send_start_container(NULL
);
3068 static void pipe_send_start_container(struct uloop_timeout
*t
)
3072 jail_oci_state
= OCI_STATE_RUNNING
;
3074 if (write(pipes
[3], sig_buf
, 1) < 0) {
3075 ERROR("can't write to child\n");
3080 run_hooks(opts
.hooks
.poststart
, post_poststart
);
3083 static void post_poststart(void)
3085 uloop_run(); /* idle here while jail is running */
3087 DEBUG("uloop interrupted, killing jail process\n");
3088 kill(jail_process
.pid
, SIGTERM
);
3089 uloop_timeout_set(&jail_process_timeout
, 1000);
3096 static void post_poststop(void);
3097 static void poststop(void) {
3098 if (opts
.namespace & CLONE_NEWNET
) {
3099 setns(netns_fd
, CLONE_NEWNET
);
3100 netns_updown(getpid(), false);
3101 jail_network_stop();
3104 run_hooks(opts
.hooks
.poststop
, post_poststop
);
3107 static void post_poststop(void)
3111 ubus_free(parent_ctx
);
3113 exit(jail_return_code
);