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"
58 #include <libubox/utils.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>
66 #ifndef CLONE_NEWCGROUP
67 #define CLONE_NEWCGROUP 0x02000000
70 #define STACK_SIZE (1024 * 1024)
71 #define OPT_ARGS "S:C:n:h:r:w:d:psulocU:G:NR:fFO:T:EyJ:iP:"
73 #define OCI_VERSION_STRING "1.0.2"
101 struct sock_fprog
*ociseccomp
;
103 struct jail_capset capset
;
108 char *tmpoverlaysize
;
113 struct sysctl_val
**sysctl
;
136 gid_t
*additional_gids
;
137 size_t num_additional_gids
;
142 struct hook_execvpe
**createRuntime
;
143 struct hook_execvpe
**createContainer
;
144 struct hook_execvpe
**startContainer
;
145 struct hook_execvpe
**poststart
;
146 struct hook_execvpe
**poststop
;
148 struct rlimit
*rlimits
[RLIM_NLIMITS
];
150 bool set_oom_score_adj
;
151 struct mknod_args
**devices
;
154 struct blob_attr
*annotations
;
157 static struct blob_buf ocibuf
;
159 extern int pivot_root(const char *new_root
, const char *put_old
);
163 static char child_stack
[STACK_SIZE
];
165 static struct ubus_context
*parent_ctx
;
170 static inline bool has_namespaces(void)
172 return ((opts
.setns
.pid
!= -1) ||
173 (opts
.setns
.net
!= -1) ||
174 (opts
.setns
.ns
!= -1) ||
175 (opts
.setns
.ipc
!= -1) ||
176 (opts
.setns
.uts
!= -1) ||
177 (opts
.setns
.user
!= -1) ||
178 (opts
.setns
.cgroup
!= -1) ||
180 (opts
.setns
.time
!= -1) ||
185 static void free_oci_envp(char **p
) {
197 static void free_hooklist(struct hook_execvpe
**hooklist
)
199 struct hook_execvpe
*cur
;
206 free_oci_envp(cur
->argv
);
207 free_oci_envp(cur
->envp
);
214 static void free_sysctl(void) {
215 struct sysctl_val
*cur
;
226 static void free_devices(void) {
227 struct mknod_args
**cur
;
241 static void free_rlimits(void) {
244 for (type
= 0; type
< RLIM_NLIMITS
; ++type
)
245 free(opts
.rlimits
[type
]);
248 static void free_opts(bool parent
) {
250 free_library_search();
253 /* we need to keep argv, envp and seccomp filter in child */
254 if (parent
) { /* parent-only */
255 if (opts
.ociseccomp
) {
256 free(opts
.ociseccomp
->filter
);
257 free(opts
.ociseccomp
);
260 free_oci_envp(opts
.jail_argv
);
261 free_oci_envp(opts
.envp
);
262 } else { /* child-only */
274 free(opts
.annotations
);
275 free_hooklist(opts
.hooks
.createRuntime
);
276 free_hooklist(opts
.hooks
.createContainer
);
277 free_hooklist(opts
.hooks
.startContainer
);
278 free_hooklist(opts
.hooks
.poststart
);
279 free_hooklist(opts
.hooks
.poststop
);
282 static int mount_overlay(char *jail_root
, char *overlaydir
) {
283 char *upperdir
, *workdir
, *optsstr
, *upperetc
, *upperresolvconf
;
284 const char mountoptsformat
[] = "lowerdir=%s,upperdir=%s,workdir=%s";
287 if (asprintf(&upperdir
, "%s%s", overlaydir
, "/upper") < 0)
290 if (asprintf(&workdir
, "%s%s", overlaydir
, "/work") < 0)
293 if (asprintf(&optsstr
, mountoptsformat
, jail_root
, upperdir
, workdir
) < 0)
296 if (mkdir_p(upperdir
, 0755) || mkdir_p(workdir
, 0755))
300 * make sure /etc/resolv.conf exists in overlay and is owned by jail userns root
301 * this is to work-around a bug in overlayfs described in the overlayfs-userns
303 * 3. modification of a file 'hithere' which is in l but not yet
304 * in u, and which is not owned by T, is not allowed, even if
305 * writes to u are allowed. This may be a bug in overlayfs,
306 * but it is safe behavior.
308 if (asprintf(&upperetc
, "%s/etc", upperdir
) < 0)
311 if (mkdir_p(upperetc
, 0755))
312 goto upper_etc_printf
;
314 if (asprintf(&upperresolvconf
, "%s/resolv.conf", upperetc
) < 0)
315 goto upper_etc_printf
;
317 fd
= creat(upperresolvconf
, 0644);
320 ERROR("creat(%s) failed: %m\n", upperresolvconf
);
324 DEBUG("mount -t overlay %s %s (%s)\n", jail_root
, jail_root
, optsstr
);
326 if (mount(jail_root
, jail_root
, "overlay", MS_NOATIME
, optsstr
))
327 goto upper_resolvconf_printf
;
331 upper_resolvconf_printf
:
332 free(upperresolvconf
);
345 static void pass_console(int console_fd
)
347 struct ubus_context
*child_ctx
= ubus_connect(NULL
);
348 static struct blob_buf req
;
354 blob_buf_init(&req
, 0);
355 blobmsg_add_string(&req
, "name", opts
.name
);
357 if (ubus_lookup_id(child_ctx
, "container", &id
) ||
358 ubus_invoke_fd(child_ctx
, id
, "console_set", req
.head
, NULL
, NULL
, 3000, console_fd
))
359 INFO("ubus request failed\n");
364 ubus_free(child_ctx
);
367 static int create_dev_console(const char *jail_root
)
370 char dev_console_path
[PATH_MAX
];
371 int slave_console_fd
;
373 /* Open UNIX/98 virtual console */
374 console_fd
= posix_openpt(O_RDWR
| O_NOCTTY
);
375 if (console_fd
== -1)
378 console_fname
= ptsname(console_fd
);
379 DEBUG("got console fd %d and PTS client name %s\n", console_fd
, console_fname
);
384 unlockpt(console_fd
);
386 /* pass PTY master to procd */
387 pass_console(console_fd
);
389 /* mount-bind PTY slave to /dev/console in jail */
390 snprintf(dev_console_path
, sizeof(dev_console_path
), "%s/dev/console", jail_root
);
391 close(creat(dev_console_path
, 0620));
393 if (mount(console_fname
, dev_console_path
, "bind", MS_BIND
, NULL
))
396 /* use PTY slave for stdio */
397 slave_console_fd
= open(console_fname
, O_RDWR
); /* | O_NOCTTY */
398 dup2(slave_console_fd
, 0);
399 dup2(slave_console_fd
, 1);
400 dup2(slave_console_fd
, 2);
401 close(slave_console_fd
);
403 INFO("using guest console %s\n", console_fname
);
412 static int hook_running
= 0;
413 static int hook_return_code
= 0;
414 static struct hook_execvpe
**current_hook
= NULL
;
415 typedef void (*hook_return_handler
)(void);
416 static hook_return_handler hook_return_cb
= NULL
;
418 static void hook_process_timeout_cb(struct uloop_timeout
*t
);
419 static struct uloop_timeout hook_process_timeout
= {
420 .cb
= hook_process_timeout_cb
,
423 static void run_hooklist(void);
424 static void hook_process_handler(struct uloop_process
*c
, int ret
)
426 uloop_timeout_cancel(&hook_process_timeout
);
428 if (WIFEXITED(ret
)) {
429 hook_return_code
= WEXITSTATUS(ret
);
430 if (hook_return_code
)
431 ERROR("hook (%d) exited with exit: %d\n", c
->pid
, hook_return_code
);
433 DEBUG("hook (%d) exited with exit: %d\n", c
->pid
, hook_return_code
);
436 hook_return_code
= WTERMSIG(ret
);
437 ERROR("hook (%d) exited with signal: %d\n", c
->pid
, hook_return_code
);
444 static struct uloop_process hook_process
= {
445 .cb
= hook_process_handler
,
448 static void hook_process_timeout_cb(struct uloop_timeout
*t
)
450 DEBUG("hook process failed to stop, sending SIGKILL\n");
451 kill(hook_process
.pid
, SIGKILL
);
454 static void run_hooklist(void)
456 struct hook_execvpe
*hook
= *current_hook
;
462 DEBUG("executing hook %s\n", hook
->file
);
464 if (stat(hook
->file
, &s
))
465 hook_process_handler(&hook_process
, ENOENT
);
467 if (!((unsigned long)s
.st_mode
& (S_IXUSR
| S_IXGRP
| S_IXOTH
)))
468 hook_process_handler(&hook_process
, EPERM
);
470 if (!((unsigned long)s
.st_mode
& (S_IRUSR
| S_IRGRP
| S_IROTH
)))
471 hook_process_handler(&hook_process
, EPERM
);
474 hook_process
.pid
= fork();
475 if (hook_process
.pid
== 0) {
477 execve(hook
->file
, hook
->argv
, hook
->envp
);
478 ERROR("execve error %m\n");
480 } else if (hook_process
.pid
< 0) {
482 ERROR("hook fork error\n");
484 hook_process_handler(&hook_process
, errno
);
488 uloop_process_add(&hook_process
);
490 if (hook
->timeout
> 0)
491 uloop_timeout_set(&hook_process_timeout
, 1000 * hook
->timeout
);
495 DEBUG("uloop interrupted, killing jail process\n");
496 kill(hook_process
.pid
, SIGTERM
);
497 uloop_timeout_set(&hook_process_timeout
, 1000);
502 static void run_hooks(struct hook_execvpe
**hooklist
, hook_return_handler return_cb
)
507 current_hook
= hooklist
;
508 hook_return_cb
= return_cb
;
513 static int apply_sysctl(const char *jail_root
)
515 struct sysctl_val
**cur
;
516 char *procdir
, *fname
;
522 asprintf(&procdir
, "%s/proc", jail_root
);
526 mkdir(procdir
, 0700);
527 if (mount("proc", procdir
, "proc", MS_NOATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
, 0))
533 asprintf(&fname
, "%s/sys/%s", procdir
, (*cur
)->entry
);
537 DEBUG("sysctl: writing '%s' to %s\n", (*cur
)->value
, fname
);
539 f
= open(fname
, O_WRONLY
);
541 ERROR("sysctl: can't open %s\n", fname
);
544 write(f
, (*cur
)->value
, strlen((*cur
)->value
));
557 /* glibc defines makedev calling a function. make sure it's a pure macro */
558 #if defined(__GLIBC__)
560 /* from musl's sys/sysmacros.h */
561 #define makedev(x,y) ( \
562 (((x)&0xfffff000ULL) << 32) | \
563 (((x)&0x00000fffULL) << 8) | \
564 (((y)&0xffffff00ULL) << 12) | \
565 (((y)&0x000000ffULL)) )
568 static struct mknod_args default_devices
[] = {
569 { .path
= "/dev/null", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
|S_IROTH
|S_IWOTH
), .dev
= makedev(1, 3) },
570 { .path
= "/dev/zero", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
|S_IROTH
|S_IWOTH
), .dev
= makedev(1, 5) },
571 { .path
= "/dev/full", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
|S_IROTH
|S_IWOTH
), .dev
= makedev(1, 7) },
572 { .path
= "/dev/random", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
|S_IROTH
|S_IWOTH
), .dev
= makedev(1, 8) },
573 { .path
= "/dev/urandom", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
|S_IROTH
|S_IWOTH
), .dev
= makedev(1, 9) },
574 { .path
= "/dev/tty", .mode
= (S_IFCHR
|S_IRUSR
|S_IWUSR
|S_IRGRP
|S_IWGRP
), .dev
= makedev(5, 0), .gid
= 5 },
578 static int create_devices(void)
580 struct mknod_args
**cur
, *curdef
;
583 goto only_default_devices
;
588 DEBUG("creating %s (mode=%08o)\n", (*cur
)->path
, (*cur
)->mode
);
589 if (mknod((*cur
)->path
, (*cur
)->mode
, (*cur
)->dev
))
592 if (((*cur
)->uid
|| (*cur
)->gid
) &&
593 chown((*cur
)->path
, (*cur
)->uid
, (*cur
)->gid
))
599 only_default_devices
:
600 curdef
= default_devices
;
601 while(curdef
->path
) {
602 DEBUG("creating %s (mode=%08o)\n", curdef
->path
, curdef
->mode
);
603 if (mknod(curdef
->path
, curdef
->mode
, curdef
->dev
)) {
605 continue; /* may already exist, eg. due to a bind-mount */
607 if ((curdef
->uid
|| curdef
->gid
) &&
608 chown(curdef
->path
, curdef
->uid
, curdef
->gid
))
614 /* Dev symbolic links as defined in OCI spec */
615 symlink("/dev/pts/ptmx", "/dev/ptmx");
616 symlink("/proc/self/fd", "/dev/fd");
617 symlink("/proc/self/fd/0", "/dev/stdin");
618 symlink("/proc/self/fd/1", "/dev/stdout");
619 symlink("/proc/self/fd/2", "/dev/stderr");
624 static char jail_root
[] = "/tmp/ujail-XXXXXX";
625 static char tmpovdir
[] = "/tmp/ujail-overlay-XXXXXX";
626 static mode_t old_umask
;
627 static void enter_jail_fs(void);
628 static int build_jail_fs(void)
630 char *overlaydir
= NULL
;
632 old_umask
= umask(0);
634 if (mkdtemp(jail_root
) == NULL
) {
635 ERROR("mkdtemp(%s) failed: %m\n", jail_root
);
639 if (apply_sysctl(jail_root
)) {
640 ERROR("failed to apply sysctl values\n");
644 /* oldroot can't be MS_SHARED else pivot_root() fails */
645 if (mount("none", "/", "none", MS_REC
|MS_PRIVATE
, NULL
)) {
646 ERROR("private mount failed %m\n");
651 if (mount(opts
.extroot
, jail_root
, "bind", MS_BIND
, NULL
)) {
652 ERROR("extroot mount failed %m\n");
656 if (mount("tmpfs", jail_root
, "tmpfs", MS_NOATIME
, "mode=0755")) {
657 ERROR("tmpfs mount failed %m\n");
662 if (opts
.tmpoverlaysize
) {
663 char mountoptsstr
[] = "mode=0755,size=XXXXXXXX";
665 snprintf(mountoptsstr
, sizeof(mountoptsstr
),
666 "mode=0755,size=%s", opts
.tmpoverlaysize
);
667 if (mkdtemp(tmpovdir
) == NULL
) {
668 ERROR("mkdtemp(%s) failed: %m\n", jail_root
);
671 if (mount("tmpfs", tmpovdir
, "tmpfs", MS_NOATIME
,
673 ERROR("failed to mount tmpfs for overlay (size=%s)\n", opts
.tmpoverlaysize
);
676 overlaydir
= tmpovdir
;
680 overlaydir
= opts
.overlaydir
;
683 mount_overlay(jail_root
, overlaydir
);
685 if (chdir(jail_root
)) {
686 ERROR("chdir(%s) (jail_root) failed: %m\n", jail_root
);
690 if (mount_all(jail_root
)) {
691 ERROR("mount_all() failed\n");
696 create_dev_console(jail_root
);
698 /* make sure /etc/resolv.conf exists if in new network namespace */
699 if (opts
.namespace & CLONE_NEWNET
) {
700 char jailetc
[PATH_MAX
], jaillink
[PATH_MAX
];
702 snprintf(jailetc
, PATH_MAX
, "%s/etc", jail_root
);
703 mkdir_p(jailetc
, 0755);
704 snprintf(jaillink
, PATH_MAX
, "%s/etc/resolv.conf", jail_root
);
708 symlink("../dev/resolv.conf.d/resolv.conf.auto", jaillink
);
711 run_hooks(opts
.hooks
.createContainer
, enter_jail_fs
);
716 static bool exit_from_child
;
717 static void free_and_exit(int ret
)
719 if (!exit_from_child
&& opts
.ocibundle
)
722 if (!exit_from_child
&& parent_ctx
)
723 ubus_free(parent_ctx
);
725 free_opts(!exit_from_child
);
730 static void post_jail_fs(void);
731 static void enter_jail_fs(void)
733 char dirbuf
[sizeof(jail_root
) + 4];
735 snprintf(dirbuf
, sizeof(dirbuf
), "%s/old", jail_root
);
738 if (pivot_root(jail_root
, dirbuf
) == -1) {
739 ERROR("pivot_root(%s, %s) failed: %m\n", jail_root
, dirbuf
);
743 ERROR("chdir(/) (after pivot_root) failed: %m\n");
747 snprintf(dirbuf
, sizeof(dirbuf
), "/old%s", jail_root
);
748 umount2(dirbuf
, MNT_DETACH
);
750 if (opts
.tmpoverlaysize
) {
751 char tmpdirbuf
[sizeof(tmpovdir
) + 4];
752 snprintf(tmpdirbuf
, sizeof(tmpdirbuf
), "/old%s", tmpovdir
);
753 umount2(tmpdirbuf
, MNT_DETACH
);
757 umount2("/old", MNT_DETACH
);
760 if (create_devices()) {
761 ERROR("create_devices() failed\n");
765 mount(NULL
, "/", "bind", MS_REMOUNT
| MS_BIND
| MS_RDONLY
, 0);
771 static int write_uid_gid_map(pid_t child_pid
, bool gidmap
, char *mapstr
)
776 if (snprintf(map_path
, sizeof(map_path
), "/proc/%d/%s",
777 child_pid
, gidmap
?"gid_map":"uid_map") < 0)
780 if ((map_file
= open(map_path
, O_WRONLY
)) == -1)
783 if (dprintf(map_file
, "%s", mapstr
)) {
792 static int write_single_uid_gid_map(pid_t child_pid
, bool gidmap
, int id
)
796 const char *map_format
= "%d %d %d\n";
797 if (snprintf(map_path
, sizeof(map_path
), "/proc/%d/%s",
798 child_pid
, gidmap
?"gid_map":"uid_map") < 0)
801 if ((map_file
= open(map_path
, O_WRONLY
)) == -1)
804 if (dprintf(map_file
, map_format
, 0, id
, 1) == -1) {
813 static int write_setgroups(pid_t child_pid
, bool allow
)
816 char setgroups_path
[64];
818 if (snprintf(setgroups_path
, sizeof(setgroups_path
), "/proc/%d/setgroups",
823 if ((setgroups_file
= open(setgroups_path
, O_WRONLY
)) == -1) {
827 if (dprintf(setgroups_file
, "%s", allow
?"allow":"deny") == -1) {
828 close(setgroups_file
);
832 close(setgroups_file
);
836 static void get_jail_user(int *user
, int *user_gid
, int *gr_gid
)
838 struct passwd
*p
= NULL
;
839 struct group
*g
= NULL
;
842 p
= getpwnam(opts
.user
);
844 ERROR("failed to get uid/gid for user %s: %d (%s)\n",
845 opts
.user
, errno
, strerror(errno
));
846 free_and_exit(EXIT_FAILURE
);
849 *user_gid
= p
->pw_gid
;
856 g
= getgrnam(opts
.group
);
858 ERROR("failed to get gid for group %s: %m\n", opts
.group
);
859 free_and_exit(EXIT_FAILURE
);
867 static void set_jail_user(int pw_uid
, int user_gid
, int gr_gid
)
869 if (opts
.user
&& (user_gid
!= -1) && initgroups(opts
.user
, user_gid
)) {
870 ERROR("failed to initgroups() for user %s: %m\n", opts
.user
);
871 free_and_exit(EXIT_FAILURE
);
874 if ((gr_gid
!= -1) && setregid(gr_gid
, gr_gid
)) {
875 ERROR("failed to set group id %d: %m\n", gr_gid
);
876 free_and_exit(EXIT_FAILURE
);
879 if ((pw_uid
!= -1) && setreuid(pw_uid
, pw_uid
)) {
880 ERROR("failed to set user id %d: %m\n", pw_uid
);
881 free_and_exit(EXIT_FAILURE
);
885 static int apply_rlimits(void)
889 for (resource
= 0; resource
< RLIM_NLIMITS
; ++resource
) {
890 if (opts
.rlimits
[resource
])
891 DEBUG("applying limits to resource %u\n", resource
);
893 if (opts
.rlimits
[resource
] &&
894 setrlimit(resource
, opts
.rlimits
[resource
]))
902 static char** build_envp(const char *seccomp
, char **ocienvp
)
904 static char *envp
[MAX_ENVP
];
905 static char preload_var
[PATH_MAX
];
906 static char seccomp_var
[PATH_MAX
];
907 static char debug_var
[] = "LD_DEBUG=all";
908 static char container_var
[] = "container=ujail";
909 const char *preload_lib
= find_lib("libpreload-seccomp.so");
914 if (seccomp
&& !preload_lib
) {
915 ERROR("failed to add preload-lib to env\n");
919 snprintf(seccomp_var
, sizeof(seccomp_var
), "SECCOMP_FILE=%s", seccomp
);
920 envp
[count
++] = seccomp_var
;
921 snprintf(preload_var
, sizeof(preload_var
), "LD_PRELOAD=%s", preload_lib
);
922 envp
[count
++] = preload_var
;
925 envp
[count
++] = container_var
;
928 envp
[count
++] = debug_var
;
931 while (addenv
&& *addenv
) {
932 envp
[count
++] = *(addenv
++);
933 if (count
>= MAX_ENVP
) {
934 ERROR("environment limited to %d extra records, truncating\n", MAX_ENVP
);
941 static void usage(void)
943 fprintf(stderr
, "ujail <options> -- <binary> <params ...>\n");
944 fprintf(stderr
, " -d <num>\tshow debug log (increase num to increase verbosity)\n");
945 fprintf(stderr
, " -S <file>\tseccomp filter config\n");
946 fprintf(stderr
, " -C <file>\tcapabilities drop config\n");
947 fprintf(stderr
, " -c\t\tset PR_SET_NO_NEW_PRIVS\n");
948 fprintf(stderr
, " -n <name>\tthe name of the jail\n");
949 fprintf(stderr
, "namespace jail options:\n");
950 fprintf(stderr
, " -h <hostname>\tchange the hostname of the jail\n");
951 fprintf(stderr
, " -N\t\tjail has network namespace\n");
952 fprintf(stderr
, " -f\t\tjail has user namespace\n");
953 fprintf(stderr
, " -F\t\tjail has cgroups namespace\n");
954 fprintf(stderr
, " -r <file>\treadonly files that should be staged\n");
955 fprintf(stderr
, " -w <file>\twriteable files that should be staged\n");
956 fprintf(stderr
, " -p\t\tjail has /proc\n");
957 fprintf(stderr
, " -s\t\tjail has /sys\n");
958 fprintf(stderr
, " -l\t\tjail has /dev/log\n");
959 fprintf(stderr
, " -u\t\tjail has a ubus socket\n");
960 fprintf(stderr
, " -U <name>\tuser to run jailed process\n");
961 fprintf(stderr
, " -G <name>\tgroup to run jailed process\n");
962 fprintf(stderr
, " -o\t\tremont jail root (/) read only\n");
963 fprintf(stderr
, " -R <dir>\texternal jail rootfs (system container)\n");
964 fprintf(stderr
, " -O <dir>\tdirectory for r/w overlayfs\n");
965 fprintf(stderr
, " -T <size>\tuse tmpfs r/w overlayfs with <size>\n");
966 fprintf(stderr
, " -E\t\tfail if jail cannot be setup\n");
967 fprintf(stderr
, " -y\t\tprovide jail console\n");
968 fprintf(stderr
, " -J <dir>\tcreate container from OCI bundle\n");
969 fprintf(stderr
, " -i\t\tstart container immediately\n");
970 fprintf(stderr
, " -P <pidfile>\tcreate <pidfile>\n");
971 fprintf(stderr
, "\nWarning: by default root inside the jail is the same\n\
972 and he has the same powers as root outside the jail,\n\
973 thus he can escape the jail and/or break stuff.\n\
974 Please use seccomp/capabilities (-S/-C) to restrict his powers\n\n\
975 If you use none of the namespace jail options,\n\
976 ujail will not use namespace/build a jail,\n\
977 and will only drop capabilities/apply seccomp filter.\n\n");
980 static int* get_namespace_fd(const unsigned int nstype
)
984 return &opts
.setns
.pid
;
986 return &opts
.setns
.net
;
988 return &opts
.setns
.ns
;
990 return &opts
.setns
.ipc
;
992 return &opts
.setns
.uts
;
994 return &opts
.setns
.user
;
995 case CLONE_NEWCGROUP
:
996 return &opts
.setns
.cgroup
;
999 return &opts
.setns
.time
;
1006 static int setns_open(unsigned long nstype
)
1008 int *fd
= get_namespace_fd(nstype
);
1016 if (setns(*fd
, nstype
) == -1) {
1025 static int jail_running
= 0;
1026 static int jail_return_code
= 0;
1028 static void jail_process_timeout_cb(struct uloop_timeout
*t
);
1029 static struct uloop_timeout jail_process_timeout
= {
1030 .cb
= jail_process_timeout_cb
,
1032 static void poststop(void);
1033 static void jail_process_handler(struct uloop_process
*c
, int ret
)
1035 uloop_timeout_cancel(&jail_process_timeout
);
1036 if (WIFEXITED(ret
)) {
1037 jail_return_code
= WEXITSTATUS(ret
);
1038 INFO("jail (%d) exited with exit: %d\n", c
->pid
, jail_return_code
);
1040 jail_return_code
= WTERMSIG(ret
);
1041 INFO("jail (%d) exited with signal: %d\n", c
->pid
, jail_return_code
);
1047 static struct uloop_process jail_process
= {
1048 .cb
= jail_process_handler
,
1051 static void jail_process_timeout_cb(struct uloop_timeout
*t
)
1053 DEBUG("jail process failed to stop, sending SIGKILL\n");
1054 kill(jail_process
.pid
, SIGKILL
);
1057 static void jail_handle_signal(int signo
)
1060 DEBUG("forwarding signal %d to the hook process\n", signo
);
1061 kill(hook_process
.pid
, signo
);
1065 DEBUG("forwarding signal %d to the jailed process\n", signo
);
1066 kill(jail_process
.pid
, signo
);
1070 static void signals_init(void)
1075 sigfillset(&sigmask
);
1076 for (i
= 0; i
< _NSIG
; i
++) {
1077 struct sigaction s
= { 0 };
1079 if (!sigismember(&sigmask
, i
))
1081 if ((i
== SIGCHLD
) || (i
== SIGPIPE
) || (i
== SIGSEGV
))
1084 s
.sa_handler
= jail_handle_signal
;
1085 sigaction(i
, &s
, NULL
);
1089 static void pre_exec_jail(struct uloop_timeout
*t
);
1090 static struct uloop_timeout pre_exec_timeout
= {
1091 .cb
= pre_exec_jail
,
1095 static int exec_jail(void *arg
)
1099 exit_from_child
= true;
1100 prctl(PR_SET_SECUREBITS
, 0);
1108 setns_open(CLONE_NEWUSER
);
1109 setns_open(CLONE_NEWNET
);
1110 setns_open(CLONE_NEWNS
);
1111 setns_open(CLONE_NEWIPC
);
1112 setns_open(CLONE_NEWUTS
);
1115 if (write(pipes
[1], buf
, 1) < 1) {
1116 ERROR("can't write to parent\n");
1117 return EXIT_FAILURE
;
1120 if (read(pipes
[2], buf
, 1) < 1) {
1121 ERROR("can't read from parent\n");
1122 return EXIT_FAILURE
;
1124 if (buf
[0] != 'O') {
1125 ERROR("parent had an error, child exiting\n");
1126 return EXIT_FAILURE
;
1129 if (opts
.namespace & CLONE_NEWCGROUP
)
1130 unshare(CLONE_NEWCGROUP
);
1132 if ((opts
.namespace & CLONE_NEWUSER
) || (opts
.setns
.user
!= -1)) {
1133 if (setregid(0, 0) < 0) {
1135 free_and_exit(EXIT_FAILURE
);
1137 if (setreuid(0, 0) < 0) {
1139 free_and_exit(EXIT_FAILURE
);
1141 if (setgroups(0, NULL
) < 0) {
1142 ERROR("setgroups\n");
1143 free_and_exit(EXIT_FAILURE
);
1147 if (opts
.namespace && opts
.hostname
&& strlen(opts
.hostname
) > 0
1148 && sethostname(opts
.hostname
, strlen(opts
.hostname
))) {
1149 ERROR("sethostname(%s) failed: %m\n", opts
.hostname
);
1150 free_and_exit(EXIT_FAILURE
);
1153 uloop_timeout_add(&pre_exec_timeout
);
1160 static void pre_exec_jail(struct uloop_timeout
*t
)
1162 if ((opts
.namespace & CLONE_NEWNS
) && build_jail_fs()) {
1163 ERROR("failed to build jail fs\n");
1164 free_and_exit(EXIT_FAILURE
);
1166 run_hooks(opts
.hooks
.createContainer
, post_jail_fs
);
1170 static void post_start_hook(void);
1171 static void post_jail_fs(void)
1175 if (read(pipes
[2], buf
, 1) < 1) {
1176 ERROR("can't read from parent\n");
1177 free_and_exit(EXIT_FAILURE
);
1179 if (buf
[0] != '!') {
1180 ERROR("parent had an error, child exiting\n");
1181 free_and_exit(EXIT_FAILURE
);
1185 run_hooks(opts
.hooks
.startContainer
, post_start_hook
);
1188 static void post_start_hook(void)
1190 int pw_uid
, pw_gid
, gr_gid
;
1193 * make sure setuid/setgid won't drop capabilities in case capabilities
1194 * have been specified explicitely.
1196 if (opts
.capset
.apply
) {
1197 if (prctl(PR_SET_SECUREBITS
, SECBIT_NO_SETUID_FIXUP
)) {
1198 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
1199 free_and_exit(EXIT_FAILURE
);
1203 /* drop capabilities, retain those still needed to further setup jail */
1204 if (applyOCIcapabilities(opts
.capset
, (1LLU << CAP_SETGID
) | (1LLU << CAP_SETUID
) | (1LLU << CAP_SETPCAP
)))
1205 free_and_exit(EXIT_FAILURE
);
1207 /* use either cmdline-supplied user/group or uid/gid from OCI spec */
1208 get_jail_user(&pw_uid
, &pw_gid
, &gr_gid
);
1209 set_jail_user(opts
.pw_uid
?:pw_uid
, opts
.pw_gid
?:pw_gid
, opts
.gr_gid
?:gr_gid
);
1211 if (opts
.additional_gids
&&
1212 (setgroups(opts
.num_additional_gids
, opts
.additional_gids
) < 0)) {
1213 ERROR("setgroups failed: %m\n");
1214 free_and_exit(EXIT_FAILURE
);
1220 /* restore securebits back to normal (and lock them if not in userns) */
1221 if (opts
.capset
.apply
) {
1222 if (prctl(PR_SET_SECUREBITS
, (opts
.namespace & CLONE_NEWUSER
)?0:
1223 SECBIT_KEEP_CAPS_LOCKED
|SECBIT_NO_SETUID_FIXUP_LOCKED
|SECBIT_NOROOT_LOCKED
)) {
1224 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
1225 free_and_exit(EXIT_FAILURE
);
1229 /* drop remaining capabilities to end up with specified sets */
1230 if (applyOCIcapabilities(opts
.capset
, 0))
1231 free_and_exit(EXIT_FAILURE
);
1233 if (opts
.no_new_privs
&& prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
1234 ERROR("prctl(PR_SET_NO_NEW_PRIVS) failed: %m\n");
1235 free_and_exit(EXIT_FAILURE
);
1238 char **envp
= build_envp(opts
.seccomp
, opts
.envp
);
1240 free_and_exit(EXIT_FAILURE
);
1242 if (opts
.cwd
&& chdir(opts
.cwd
))
1243 free_and_exit(EXIT_FAILURE
);
1245 if (opts
.ociseccomp
&& applyOCIlinuxseccomp(opts
.ociseccomp
))
1246 free_and_exit(EXIT_FAILURE
);
1250 INFO("exec-ing %s\n", *opts
.jail_argv
);
1251 if (opts
.envp
) /* respect PATH if potentially set in ENV */
1252 execvpe(*opts
.jail_argv
, opts
.jail_argv
, envp
);
1254 execve(*opts
.jail_argv
, opts
.jail_argv
, envp
);
1256 /* we get there only if execve fails */
1257 ERROR("failed to execve %s: %m\n", *opts
.jail_argv
);
1261 static int ns_open_pid(const char *nstype
, const pid_t target_ns
)
1263 char pid_pid_path
[PATH_MAX
];
1265 snprintf(pid_pid_path
, sizeof(pid_pid_path
), "/proc/%u/ns/%s", target_ns
, nstype
);
1267 return open(pid_pid_path
, O_RDONLY
);
1270 static void netns_updown(pid_t pid
, bool start
)
1272 static struct blob_buf req
;
1278 blob_buf_init(&req
, 0);
1279 blobmsg_add_string(&req
, "jail", opts
.name
);
1280 blobmsg_add_u32(&req
, "pid", pid
);
1281 blobmsg_add_u8(&req
, "start", start
);
1283 if (ubus_lookup_id(parent_ctx
, "network", &id
) ||
1284 ubus_invoke(parent_ctx
, id
, "netns_updown", req
.head
, NULL
, NULL
, 3000))
1285 INFO("ubus request failed\n");
1287 blob_buf_free(&req
);
1290 static int parseOCIenvarray(struct blob_attr
*msg
, char ***envp
)
1292 struct blob_attr
*cur
;
1295 blobmsg_for_each_attr(cur
, msg
, rem
)
1299 *envp
= calloc(1 + sz
, sizeof(char*));
1308 blobmsg_for_each_attr(cur
, msg
, rem
)
1309 (*envp
)[sz
++] = strdup(blobmsg_get_string(cur
));
1323 static const struct blobmsg_policy oci_root_policy
[] = {
1324 [OCI_ROOT_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1325 [OCI_ROOT_READONLY
] = { "readonly", BLOBMSG_TYPE_BOOL
},
1328 static int parseOCIroot(const char *jsonfile
, struct blob_attr
*msg
)
1330 static char extroot
[PATH_MAX
] = { 0 };
1331 struct blob_attr
*tb
[__OCI_ROOT_MAX
];
1335 blobmsg_parse(oci_root_policy
, __OCI_ROOT_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1337 if (!tb
[OCI_ROOT_PATH
])
1340 root_path
= blobmsg_get_string(tb
[OCI_ROOT_PATH
]);
1342 /* prepend bundle directory in case of relative paths */
1343 if (root_path
[0] != '/') {
1344 strncpy(extroot
, jsonfile
, PATH_MAX
);
1345 cur
= strrchr(extroot
, '/');
1353 strncat(extroot
, root_path
, PATH_MAX
- (strlen(extroot
) + 1));
1355 opts
.extroot
= extroot
;
1357 if (tb
[OCI_ROOT_READONLY
])
1358 opts
.ronly
= blobmsg_get_bool(tb
[OCI_ROOT_READONLY
]);
1372 static const struct blobmsg_policy oci_hook_policy
[] = {
1373 [OCI_HOOK_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1374 [OCI_HOOK_ARGS
] = { "args", BLOBMSG_TYPE_ARRAY
},
1375 [OCI_HOOK_ENV
] = { "env", BLOBMSG_TYPE_ARRAY
},
1376 [OCI_HOOK_TIMEOUT
] = { "timeout", BLOBMSG_TYPE_INT32
},
1380 static int parseOCIhook(struct hook_execvpe
***hooklist
, struct blob_attr
*msg
)
1382 struct blob_attr
*tb
[__OCI_HOOK_MAX
];
1383 struct blob_attr
*cur
;
1387 blobmsg_for_each_attr(cur
, msg
, rem
)
1393 *hooklist
= calloc(idx
+ 1, sizeof(struct hook_execvpe
*));
1399 blobmsg_for_each_attr(cur
, msg
, rem
) {
1400 blobmsg_parse(oci_hook_policy
, __OCI_HOOK_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1402 if (!tb
[OCI_HOOK_PATH
]) {
1407 (*hooklist
)[idx
] = calloc(1, sizeof(struct hook_execvpe
));
1408 if (tb
[OCI_HOOK_ARGS
]) {
1409 ret
= parseOCIenvarray(tb
[OCI_HOOK_ARGS
], &((*hooklist
)[idx
]->argv
));
1413 (*hooklist
)[idx
]->argv
= calloc(2, sizeof(char *));
1414 ((*hooklist
)[idx
]->argv
)[0] = strdup(blobmsg_get_string(tb
[OCI_HOOK_PATH
]));
1415 ((*hooklist
)[idx
]->argv
)[1] = NULL
;
1419 if (tb
[OCI_HOOK_ENV
]) {
1420 ret
= parseOCIenvarray(tb
[OCI_HOOK_ENV
], &((*hooklist
)[idx
]->envp
));
1425 if (tb
[OCI_HOOK_TIMEOUT
])
1426 (*hooklist
)[idx
]->timeout
= blobmsg_get_u32(tb
[OCI_HOOK_TIMEOUT
]);
1428 (*hooklist
)[idx
]->file
= strdup(blobmsg_get_string(tb
[OCI_HOOK_PATH
]));
1433 (*hooklist
)[idx
] = NULL
;
1435 DEBUG("added %d hooks\n", idx
);
1440 free_hooklist(*hooklist
);
1449 OCI_HOOKS_CREATERUNTIME
,
1450 OCI_HOOKS_CREATECONTAINER
,
1451 OCI_HOOKS_STARTCONTAINER
,
1452 OCI_HOOKS_POSTSTART
,
1457 static const struct blobmsg_policy oci_hooks_policy
[] = {
1458 [OCI_HOOKS_PRESTART
] = { "prestart", BLOBMSG_TYPE_ARRAY
},
1459 [OCI_HOOKS_CREATERUNTIME
] = { "createRuntime", BLOBMSG_TYPE_ARRAY
},
1460 [OCI_HOOKS_CREATECONTAINER
] = { "createContainer", BLOBMSG_TYPE_ARRAY
},
1461 [OCI_HOOKS_STARTCONTAINER
] = { "startContainer", BLOBMSG_TYPE_ARRAY
},
1462 [OCI_HOOKS_POSTSTART
] = { "poststart", BLOBMSG_TYPE_ARRAY
},
1463 [OCI_HOOKS_POSTSTOP
] = { "poststop", BLOBMSG_TYPE_ARRAY
},
1466 static int parseOCIhooks(struct blob_attr
*msg
)
1468 struct blob_attr
*tb
[__OCI_HOOKS_MAX
];
1471 blobmsg_parse(oci_hooks_policy
, __OCI_HOOKS_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1473 if (tb
[OCI_HOOKS_PRESTART
])
1474 INFO("warning: ignoring deprecated prestart hook\n");
1476 if (tb
[OCI_HOOKS_CREATERUNTIME
]) {
1477 ret
= parseOCIhook(&opts
.hooks
.createRuntime
, tb
[OCI_HOOKS_CREATERUNTIME
]);
1482 if (tb
[OCI_HOOKS_CREATECONTAINER
]) {
1483 ret
= parseOCIhook(&opts
.hooks
.createContainer
, tb
[OCI_HOOKS_CREATECONTAINER
]);
1485 goto out_createruntime
;
1488 if (tb
[OCI_HOOKS_STARTCONTAINER
]) {
1489 ret
= parseOCIhook(&opts
.hooks
.startContainer
, tb
[OCI_HOOKS_STARTCONTAINER
]);
1491 goto out_createcontainer
;
1494 if (tb
[OCI_HOOKS_POSTSTART
]) {
1495 ret
= parseOCIhook(&opts
.hooks
.poststart
, tb
[OCI_HOOKS_POSTSTART
]);
1497 goto out_startcontainer
;
1500 if (tb
[OCI_HOOKS_POSTSTOP
]) {
1501 ret
= parseOCIhook(&opts
.hooks
.poststop
, tb
[OCI_HOOKS_POSTSTOP
]);
1509 free_hooklist(opts
.hooks
.poststart
);
1511 free_hooklist(opts
.hooks
.startContainer
);
1512 out_createcontainer
:
1513 free_hooklist(opts
.hooks
.createContainer
);
1515 free_hooklist(opts
.hooks
.createRuntime
);
1522 OCI_PROCESS_USER_UID
,
1523 OCI_PROCESS_USER_GID
,
1524 OCI_PROCESS_USER_UMASK
,
1525 OCI_PROCESS_USER_ADDITIONALGIDS
,
1526 __OCI_PROCESS_USER_MAX
,
1529 static const struct blobmsg_policy oci_process_user_policy
[] = {
1530 [OCI_PROCESS_USER_UID
] = { "uid", BLOBMSG_TYPE_INT32
},
1531 [OCI_PROCESS_USER_GID
] = { "gid", BLOBMSG_TYPE_INT32
},
1532 [OCI_PROCESS_USER_UMASK
] = { "umask", BLOBMSG_TYPE_INT32
},
1533 [OCI_PROCESS_USER_ADDITIONALGIDS
] = { "additionalGids", BLOBMSG_TYPE_ARRAY
},
1536 static int parseOCIprocessuser(struct blob_attr
*msg
) {
1537 struct blob_attr
*tb
[__OCI_PROCESS_USER_MAX
];
1538 struct blob_attr
*cur
;
1542 blobmsg_parse(oci_process_user_policy
, __OCI_PROCESS_USER_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1544 if (tb
[OCI_PROCESS_USER_UID
])
1545 opts
.pw_uid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_UID
]);
1547 if (tb
[OCI_PROCESS_USER_GID
]) {
1548 opts
.pw_gid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_GID
]);
1549 opts
.gr_gid
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_GID
]);
1553 if (tb
[OCI_PROCESS_USER_ADDITIONALGIDS
]) {
1556 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_USER_ADDITIONALGIDS
], rem
) {
1558 if (has_gid
&& (blobmsg_get_u32(cur
) == opts
.gr_gid
))
1563 opts
.additional_gids
= calloc(gidcnt
+ has_gid
, sizeof(gid_t
));
1566 /* always add primary GID to set of GIDs if set */
1568 opts
.additional_gids
[gidcnt
++] = opts
.gr_gid
;
1570 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_USER_ADDITIONALGIDS
], rem
) {
1571 if (has_gid
&& (blobmsg_get_u32(cur
) == opts
.gr_gid
))
1573 opts
.additional_gids
[gidcnt
++] = blobmsg_get_u32(cur
);
1575 opts
.num_additional_gids
= gidcnt
;
1577 DEBUG("read %zu additional groups\n", gidcnt
);
1580 if (tb
[OCI_PROCESS_USER_UMASK
]) {
1581 opts
.umask
= blobmsg_get_u32(tb
[OCI_PROCESS_USER_UMASK
]);
1582 opts
.set_umask
= true;
1589 OCI_PROCESS_RLIMIT_TYPE
,
1590 OCI_PROCESS_RLIMIT_SOFT
,
1591 OCI_PROCESS_RLIMIT_HARD
,
1592 __OCI_PROCESS_RLIMIT_MAX
,
1595 static const struct blobmsg_policy oci_process_rlimit_policy
[] = {
1596 [OCI_PROCESS_RLIMIT_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
1597 [OCI_PROCESS_RLIMIT_SOFT
] = { "soft", BLOBMSG_CAST_INT64
},
1598 [OCI_PROCESS_RLIMIT_HARD
] = { "hard", BLOBMSG_CAST_INT64
},
1601 /* from manpage GETRLIMIT(2) */
1602 static const char* const rlimit_names
[RLIM_NLIMITS
] = {
1604 [RLIMIT_CORE
] = "CORE",
1605 [RLIMIT_CPU
] = "CPU",
1606 [RLIMIT_DATA
] = "DATA",
1607 [RLIMIT_FSIZE
] = "FSIZE",
1608 [RLIMIT_LOCKS
] = "LOCKS",
1609 [RLIMIT_MEMLOCK
] = "MEMLOCK",
1610 [RLIMIT_MSGQUEUE
] = "MSGQUEUE",
1611 [RLIMIT_NICE
] = "NICE",
1612 [RLIMIT_NOFILE
] = "NOFILE",
1613 [RLIMIT_NPROC
] = "NPROC",
1614 [RLIMIT_RSS
] = "RSS",
1615 [RLIMIT_RTPRIO
] = "RTPRIO",
1616 [RLIMIT_RTTIME
] = "RTTIME",
1617 [RLIMIT_SIGPENDING
] = "SIGPENDING",
1618 [RLIMIT_STACK
] = "STACK",
1621 static int resolve_rlimit(char *type
) {
1622 unsigned int rltype
;
1624 for (rltype
= 0; rltype
< RLIM_NLIMITS
; ++rltype
)
1625 if (rlimit_names
[rltype
] &&
1626 !strncmp("RLIMIT_", type
, 7) &&
1627 !strcmp(rlimit_names
[rltype
], type
+ 7))
1634 static int parseOCIrlimit(struct blob_attr
*msg
)
1636 struct blob_attr
*tb
[__OCI_PROCESS_RLIMIT_MAX
];
1638 struct rlimit
*curlim
;
1640 blobmsg_parse(oci_process_rlimit_policy
, __OCI_PROCESS_RLIMIT_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1642 if (!tb
[OCI_PROCESS_RLIMIT_TYPE
] ||
1643 !tb
[OCI_PROCESS_RLIMIT_SOFT
] ||
1644 !tb
[OCI_PROCESS_RLIMIT_HARD
])
1647 limtype
= resolve_rlimit(blobmsg_get_string(tb
[OCI_PROCESS_RLIMIT_TYPE
]));
1652 if (opts
.rlimits
[limtype
])
1655 curlim
= malloc(sizeof(struct rlimit
));
1656 curlim
->rlim_cur
= blobmsg_cast_u64(tb
[OCI_PROCESS_RLIMIT_SOFT
]);
1657 curlim
->rlim_max
= blobmsg_cast_u64(tb
[OCI_PROCESS_RLIMIT_HARD
]);
1659 opts
.rlimits
[limtype
] = curlim
;
1666 OCI_PROCESS_CAPABILITIES
,
1669 OCI_PROCESS_OOMSCOREADJ
,
1670 OCI_PROCESS_NONEWPRIVILEGES
,
1671 OCI_PROCESS_RLIMITS
,
1672 OCI_PROCESS_TERMINAL
,
1677 static const struct blobmsg_policy oci_process_policy
[] = {
1678 [OCI_PROCESS_ARGS
] = { "args", BLOBMSG_TYPE_ARRAY
},
1679 [OCI_PROCESS_CAPABILITIES
] = { "capabilities", BLOBMSG_TYPE_TABLE
},
1680 [OCI_PROCESS_CWD
] = { "cwd", BLOBMSG_TYPE_STRING
},
1681 [OCI_PROCESS_ENV
] = { "env", BLOBMSG_TYPE_ARRAY
},
1682 [OCI_PROCESS_OOMSCOREADJ
] = { "oomScoreAdj", BLOBMSG_TYPE_INT32
},
1683 [OCI_PROCESS_NONEWPRIVILEGES
] = { "noNewPrivileges", BLOBMSG_TYPE_BOOL
},
1684 [OCI_PROCESS_RLIMITS
] = { "rlimits", BLOBMSG_TYPE_ARRAY
},
1685 [OCI_PROCESS_TERMINAL
] = { "terminal", BLOBMSG_TYPE_BOOL
},
1686 [OCI_PROCESS_USER
] = { "user", BLOBMSG_TYPE_TABLE
},
1690 static int parseOCIprocess(struct blob_attr
*msg
)
1692 struct blob_attr
*tb
[__OCI_PROCESS_MAX
], *cur
;
1695 blobmsg_parse(oci_process_policy
, __OCI_PROCESS_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1697 if (!tb
[OCI_PROCESS_ARGS
])
1700 res
= parseOCIenvarray(tb
[OCI_PROCESS_ARGS
], &opts
.jail_argv
);
1704 if (tb
[OCI_PROCESS_TERMINAL
])
1705 opts
.console
= blobmsg_get_bool(tb
[OCI_PROCESS_TERMINAL
]);
1707 if (tb
[OCI_PROCESS_NONEWPRIVILEGES
])
1708 opts
.no_new_privs
= blobmsg_get_bool(tb
[OCI_PROCESS_NONEWPRIVILEGES
]);
1710 if (tb
[OCI_PROCESS_CWD
])
1711 opts
.cwd
= strdup(blobmsg_get_string(tb
[OCI_PROCESS_CWD
]));
1713 if (tb
[OCI_PROCESS_ENV
]) {
1714 res
= parseOCIenvarray(tb
[OCI_PROCESS_ENV
], &opts
.envp
);
1719 if (tb
[OCI_PROCESS_USER
] && (res
= parseOCIprocessuser(tb
[OCI_PROCESS_USER
])))
1722 if (tb
[OCI_PROCESS_CAPABILITIES
] &&
1723 (res
= parseOCIcapabilities(&opts
.capset
, tb
[OCI_PROCESS_CAPABILITIES
])))
1726 if (tb
[OCI_PROCESS_RLIMITS
]) {
1727 blobmsg_for_each_attr(cur
, tb
[OCI_PROCESS_RLIMITS
], rem
) {
1728 res
= parseOCIrlimit(cur
);
1734 if (tb
[OCI_PROCESS_OOMSCOREADJ
]) {
1735 opts
.oom_score_adj
= blobmsg_get_u32(tb
[OCI_PROCESS_OOMSCOREADJ
]);
1736 opts
.set_oom_score_adj
= true;
1743 OCI_LINUX_NAMESPACE_TYPE
,
1744 OCI_LINUX_NAMESPACE_PATH
,
1745 __OCI_LINUX_NAMESPACE_MAX
,
1748 static const struct blobmsg_policy oci_linux_namespace_policy
[] = {
1749 [OCI_LINUX_NAMESPACE_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
1750 [OCI_LINUX_NAMESPACE_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1753 static int resolve_nstype(char *type
) {
1754 if (!strcmp("pid", type
))
1755 return CLONE_NEWPID
;
1756 else if (!strcmp("network", type
))
1757 return CLONE_NEWNET
;
1758 else if (!strcmp("mount", type
))
1760 else if (!strcmp("ipc", type
))
1761 return CLONE_NEWIPC
;
1762 else if (!strcmp("uts", type
))
1763 return CLONE_NEWUTS
;
1764 else if (!strcmp("user", type
))
1765 return CLONE_NEWUSER
;
1766 else if (!strcmp("cgroup", type
))
1767 return CLONE_NEWCGROUP
;
1768 #ifdef CLONE_NEWTIME
1769 else if (!strcmp("time", type
))
1770 return CLONE_NEWTIME
;
1776 static int parseOCIlinuxns(struct blob_attr
*msg
)
1778 struct blob_attr
*tb
[__OCI_LINUX_NAMESPACE_MAX
];
1783 blobmsg_parse(oci_linux_namespace_policy
, __OCI_LINUX_NAMESPACE_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
1785 if (!tb
[OCI_LINUX_NAMESPACE_TYPE
])
1788 nstype
= resolve_nstype(blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]));
1792 if (opts
.namespace & nstype
)
1795 setns
= get_namespace_fd(nstype
);
1803 if (tb
[OCI_LINUX_NAMESPACE_PATH
]) {
1804 DEBUG("opening existing %s namespace from path %s\n",
1805 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]),
1806 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_PATH
]));
1808 fd
= open(blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_PATH
]), O_RDONLY
);
1810 return errno
?:ESTALE
;
1812 if (ioctl(fd
, NS_GET_NSTYPE
) != nstype
)
1815 DEBUG("opened existing %s namespace got filehandler %u\n",
1816 blobmsg_get_string(tb
[OCI_LINUX_NAMESPACE_TYPE
]),
1821 opts
.namespace |= nstype
;
1827 static void get_jail_root_user(bool is_gidmap
, uint32_t container_id
, uint32_t host_id
, uint32_t size
)
1829 if (container_id
== 0 && size
>= 1)
1831 opts
.root_map_uid
= host_id
;
1835 OCI_LINUX_UIDGIDMAP_CONTAINERID
,
1836 OCI_LINUX_UIDGIDMAP_HOSTID
,
1837 OCI_LINUX_UIDGIDMAP_SIZE
,
1838 __OCI_LINUX_UIDGIDMAP_MAX
,
1841 static const struct blobmsg_policy oci_linux_uidgidmap_policy
[] = {
1842 [OCI_LINUX_UIDGIDMAP_CONTAINERID
] = { "containerID", BLOBMSG_TYPE_INT32
},
1843 [OCI_LINUX_UIDGIDMAP_HOSTID
] = { "hostID", BLOBMSG_TYPE_INT32
},
1844 [OCI_LINUX_UIDGIDMAP_SIZE
] = { "size", BLOBMSG_TYPE_INT32
},
1847 static int parseOCIuidgidmappings(struct blob_attr
*msg
, bool is_gidmap
)
1849 struct blob_attr
*tb
[__OCI_LINUX_UIDGIDMAP_MAX
];
1850 struct blob_attr
*cur
;
1853 size_t len
, pos
, totallen
= 0;
1855 blobmsg_for_each_attr(cur
, msg
, rem
) {
1856 blobmsg_parse(oci_linux_uidgidmap_policy
, __OCI_LINUX_UIDGIDMAP_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1858 if (!tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
] ||
1859 !tb
[OCI_LINUX_UIDGIDMAP_HOSTID
] ||
1860 !tb
[OCI_LINUX_UIDGIDMAP_SIZE
])
1864 totallen
+= snprintf(NULL
, 0, "%d %d %d\n",
1865 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
]),
1866 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_HOSTID
]),
1867 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_SIZE
]));
1870 /* allocate combined mapping string */
1871 map
= malloc(totallen
+ 1);
1876 blobmsg_for_each_attr(cur
, msg
, rem
) {
1877 blobmsg_parse(oci_linux_uidgidmap_policy
, __OCI_LINUX_UIDGIDMAP_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1879 get_jail_root_user(is_gidmap
, blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
]),
1880 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_HOSTID
]),
1881 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_SIZE
]));
1883 /* write mapping line into pre-allocated string */
1884 len
= snprintf(&map
[pos
], totallen
+ 1, "%d %d %d\n",
1885 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_CONTAINERID
]),
1886 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_HOSTID
]),
1887 blobmsg_get_u32(tb
[OCI_LINUX_UIDGIDMAP_SIZE
]));
1892 assert(totallen
== 0);
1907 OCI_DEVICES_FILEMODE
,
1913 static const struct blobmsg_policy oci_devices_policy
[] = {
1914 [OCI_DEVICES_TYPE
] = { "type", BLOBMSG_TYPE_STRING
},
1915 [OCI_DEVICES_PATH
] = { "path", BLOBMSG_TYPE_STRING
},
1916 [OCI_DEVICES_MAJOR
] = { "major", BLOBMSG_TYPE_INT32
},
1917 [OCI_DEVICES_MINOR
] = { "minor", BLOBMSG_TYPE_INT32
},
1918 [OCI_DEVICES_FILEMODE
] = { "fileMode", BLOBMSG_TYPE_INT32
},
1919 [OCI_DEVICES_UID
] = { "uid", BLOBMSG_TYPE_INT32
},
1920 [OCI_DEVICES_GID
] = { "uid", BLOBMSG_TYPE_INT32
},
1923 static mode_t
resolve_devtype(char *tstr
)
1925 if (!strcmp("c", tstr
) ||
1928 else if (!strcmp("b", tstr
))
1930 else if (!strcmp("p", tstr
))
1936 static int parseOCIdevices(struct blob_attr
*msg
)
1938 struct blob_attr
*tb
[__OCI_DEVICES_MAX
];
1939 struct blob_attr
*cur
;
1942 struct mknod_args
*tmp
;
1944 blobmsg_for_each_attr(cur
, msg
, rem
)
1947 opts
.devices
= calloc(cnt
+ 1, sizeof(struct mknod_args
*));
1950 blobmsg_for_each_attr(cur
, msg
, rem
) {
1951 blobmsg_parse(oci_devices_policy
, __OCI_DEVICES_MAX
, tb
, blobmsg_data(cur
), blobmsg_len(cur
));
1952 if (!tb
[OCI_DEVICES_TYPE
] ||
1953 !tb
[OCI_DEVICES_PATH
])
1956 tmp
= calloc(1, sizeof(struct mknod_args
));
1960 tmp
->mode
= resolve_devtype(blobmsg_get_string(tb
[OCI_DEVICES_TYPE
]));
1964 if (tmp
->mode
!= S_IFIFO
) {
1965 if (!tb
[OCI_DEVICES_MAJOR
] || !tb
[OCI_DEVICES_MINOR
])
1968 tmp
->dev
= makedev(blobmsg_get_u32(tb
[OCI_DEVICES_MAJOR
]),
1969 blobmsg_get_u32(tb
[OCI_DEVICES_MINOR
]));
1972 if (tb
[OCI_DEVICES_FILEMODE
]) {
1973 if (~(S_IRWXU
|S_IRWXG
|S_IRWXO
) & blobmsg_get_u32(tb
[OCI_DEVICES_FILEMODE
]))
1976 tmp
->mode
|= blobmsg_get_u32(tb
[OCI_DEVICES_FILEMODE
]);
1978 tmp
->mode
|= (S_IRUSR
|S_IWUSR
); /* 0600 */
1981 tmp
->path
= strdup(blobmsg_get_string(tb
[OCI_DEVICES_PATH
]));
1983 if (tb
[OCI_DEVICES_UID
])
1984 tmp
->uid
= blobmsg_get_u32(tb
[OCI_DEVICES_UID
]);
1988 if (tb
[OCI_DEVICES_GID
])
1989 tmp
->gid
= blobmsg_get_u32(tb
[OCI_DEVICES_GID
]);
1993 DEBUG("read device %s (%s)\n", blobmsg_get_string(tb
[OCI_DEVICES_PATH
]), blobmsg_get_string(tb
[OCI_DEVICES_TYPE
]));
1994 opts
.devices
[cnt
++] = tmp
;
1997 opts
.devices
[cnt
] = NULL
;
2002 static int parseOCIsysctl(struct blob_attr
*msg
)
2004 struct blob_attr
*cur
;
2009 blobmsg_for_each_attr(cur
, msg
, rem
) {
2010 if (!blobmsg_name(cur
) || !blobmsg_get_string(cur
))
2019 opts
.sysctl
= calloc(cnt
+ 1, sizeof(struct sysctl_val
*));
2024 blobmsg_for_each_attr(cur
, msg
, rem
) {
2025 opts
.sysctl
[cnt
] = malloc(sizeof(struct sysctl_val
));
2026 if (!opts
.sysctl
[cnt
])
2029 /* replace '.' with '/' in entry name */
2030 tc
= tmp
= strdup(blobmsg_name(cur
));
2031 while ((tc
= strchr(tc
, '.')))
2034 opts
.sysctl
[cnt
]->value
= strdup(blobmsg_get_string(cur
));
2035 opts
.sysctl
[cnt
]->entry
= tmp
;
2040 opts
.sysctl
[cnt
] = NULL
;
2047 OCI_LINUX_CGROUPSPATH
,
2048 OCI_LINUX_RESOURCES
,
2051 OCI_LINUX_NAMESPACES
,
2053 OCI_LINUX_UIDMAPPINGS
,
2054 OCI_LINUX_GIDMAPPINGS
,
2055 OCI_LINUX_MASKEDPATHS
,
2056 OCI_LINUX_READONLYPATHS
,
2057 OCI_LINUX_ROOTFSPROPAGATION
,
2061 static const struct blobmsg_policy oci_linux_policy
[] = {
2062 [OCI_LINUX_CGROUPSPATH
] = { "cgroupsPath", BLOBMSG_TYPE_STRING
},
2063 [OCI_LINUX_RESOURCES
] = { "resources", BLOBMSG_TYPE_TABLE
},
2064 [OCI_LINUX_SECCOMP
] = { "seccomp", BLOBMSG_TYPE_TABLE
},
2065 [OCI_LINUX_SYSCTL
] = { "sysctl", BLOBMSG_TYPE_TABLE
},
2066 [OCI_LINUX_NAMESPACES
] = { "namespaces", BLOBMSG_TYPE_ARRAY
},
2067 [OCI_LINUX_DEVICES
] = { "devices", BLOBMSG_TYPE_ARRAY
},
2068 [OCI_LINUX_UIDMAPPINGS
] = { "uidMappings", BLOBMSG_TYPE_ARRAY
},
2069 [OCI_LINUX_GIDMAPPINGS
] = { "gidMappings", BLOBMSG_TYPE_ARRAY
},
2070 [OCI_LINUX_MASKEDPATHS
] = { "maskedPaths", BLOBMSG_TYPE_ARRAY
},
2071 [OCI_LINUX_READONLYPATHS
] = { "readonlyPaths", BLOBMSG_TYPE_ARRAY
},
2072 [OCI_LINUX_ROOTFSPROPAGATION
] = { "rootfsPropagation", BLOBMSG_TYPE_STRING
},
2075 static int parseOCIlinux(struct blob_attr
*msg
)
2077 struct blob_attr
*tb
[__OCI_LINUX_MAX
];
2078 struct blob_attr
*cur
;
2082 char cgfullpath
[256] = "/sys/fs/cgroup";
2084 blobmsg_parse(oci_linux_policy
, __OCI_LINUX_MAX
, tb
, blobmsg_data(msg
), blobmsg_len(msg
));
2086 if (tb
[OCI_LINUX_NAMESPACES
]) {
2087 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_NAMESPACES
], rem
) {
2088 res
= parseOCIlinuxns(cur
);
2094 if (tb
[OCI_LINUX_UIDMAPPINGS
]) {
2095 res
= parseOCIuidgidmappings(tb
[OCI_LINUX_GIDMAPPINGS
], 0);
2100 if (tb
[OCI_LINUX_GIDMAPPINGS
]) {
2101 res
= parseOCIuidgidmappings(tb
[OCI_LINUX_GIDMAPPINGS
], 1);
2106 if (tb
[OCI_LINUX_READONLYPATHS
]) {
2107 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_READONLYPATHS
], rem
) {
2108 res
= add_mount(NULL
, blobmsg_get_string(cur
), NULL
, MS_BIND
| MS_REC
| MS_RDONLY
, 0, NULL
, 0);
2114 if (tb
[OCI_LINUX_MASKEDPATHS
]) {
2115 blobmsg_for_each_attr(cur
, tb
[OCI_LINUX_MASKEDPATHS
], rem
) {
2116 res
= add_mount((void *)(-1), blobmsg_get_string(cur
), NULL
, 0, 0, NULL
, 0);
2122 if (tb
[OCI_LINUX_SYSCTL
]) {
2123 res
= parseOCIsysctl(tb
[OCI_LINUX_SYSCTL
]);
2128 if (tb
[OCI_LINUX_SECCOMP
]) {
2129 opts
.ociseccomp
= parseOCIlinuxseccomp(tb
[OCI_LINUX_SECCOMP
]);
2130 if (!opts
.ociseccomp
)
2134 if (tb
[OCI_LINUX_DEVICES
]) {
2135 res
= parseOCIdevices(tb
[OCI_LINUX_DEVICES
]);
2140 if (tb
[OCI_LINUX_CGROUPSPATH
]) {
2141 cgpath
= blobmsg_get_string(tb
[OCI_LINUX_CGROUPSPATH
]);
2142 if (cgpath
[0] == '/') {
2143 if (strlen(cgpath
) >= (sizeof(cgfullpath
) - strlen(cgfullpath
)))
2146 strcat(cgfullpath
, cgpath
);
2148 strcat(cgfullpath
, "/containers/");
2149 strcat(cgfullpath
, opts
.name
); /* should be container name rather than jail name */
2150 strcat(cgfullpath
, "/");
2151 if (strlen(cgpath
) >= (sizeof(cgfullpath
) - strlen(cgfullpath
)))
2154 strcat(cgfullpath
, cgpath
);
2157 strcat(cgfullpath
, "/containers/");
2158 strcat(cgfullpath
, opts
.name
); /* should be container name rather than jail name */
2159 strcat(cgfullpath
, "/");
2160 strcat(cgfullpath
, opts
.name
); /* should be container instance name rather than jail name */
2163 cgroups_init(cgfullpath
);
2165 if (tb
[OCI_LINUX_RESOURCES
]) {
2166 res
= parseOCIlinuxcgroups(tb
[OCI_LINUX_RESOURCES
]);
2186 static const struct blobmsg_policy oci_policy
[] = {
2187 [OCI_VERSION
] = { "ociVersion", BLOBMSG_TYPE_STRING
},
2188 [OCI_HOSTNAME
] = { "hostname", BLOBMSG_TYPE_STRING
},
2189 [OCI_PROCESS
] = { "process", BLOBMSG_TYPE_TABLE
},
2190 [OCI_ROOT
] = { "root", BLOBMSG_TYPE_TABLE
},
2191 [OCI_MOUNTS
] = { "mounts", BLOBMSG_TYPE_ARRAY
},
2192 [OCI_HOOKS
] = { "hooks", BLOBMSG_TYPE_TABLE
},
2193 [OCI_LINUX
] = { "linux", BLOBMSG_TYPE_TABLE
},
2194 [OCI_ANNOTATIONS
] = { "annotations", BLOBMSG_TYPE_TABLE
},
2197 static int parseOCI(const char *jsonfile
)
2199 struct blob_attr
*tb
[__OCI_MAX
];
2200 struct blob_attr
*cur
;
2204 blob_buf_init(&ocibuf
, 0);
2206 if (!blobmsg_add_json_from_file(&ocibuf
, jsonfile
)) {
2211 blobmsg_parse(oci_policy
, __OCI_MAX
, tb
, blob_data(ocibuf
.head
), blob_len(ocibuf
.head
));
2213 if (!tb
[OCI_VERSION
]) {
2218 if (strncmp("1.0", blobmsg_get_string(tb
[OCI_VERSION
]), 3)) {
2219 ERROR("unsupported ociVersion %s\n", blobmsg_get_string(tb
[OCI_VERSION
]));
2224 if (tb
[OCI_HOSTNAME
])
2225 opts
.hostname
= strdup(blobmsg_get_string(tb
[OCI_HOSTNAME
]));
2227 if (!tb
[OCI_PROCESS
]) {
2232 if ((res
= parseOCIprocess(tb
[OCI_PROCESS
])))
2235 if (!tb
[OCI_ROOT
]) {
2239 if ((res
= parseOCIroot(jsonfile
, tb
[OCI_ROOT
])))
2242 if (!tb
[OCI_MOUNTS
]) {
2247 blobmsg_for_each_attr(cur
, tb
[OCI_MOUNTS
], rem
)
2248 if ((res
= parseOCImount(cur
)))
2251 if (tb
[OCI_LINUX
] && (res
= parseOCIlinux(tb
[OCI_LINUX
])))
2254 if (tb
[OCI_HOOKS
] && (res
= parseOCIhooks(tb
[OCI_HOOKS
])))
2257 if (tb
[OCI_ANNOTATIONS
])
2258 opts
.annotations
= blob_memdup(tb
[OCI_ANNOTATIONS
]);
2261 blob_buf_free(&ocibuf
);
2266 static int set_oom_score_adj(void)
2271 if (!opts
.set_oom_score_adj
)
2274 snprintf(fname
, sizeof(fname
), "/proc/%u/oom_score_adj", jail_process
.pid
);
2275 f
= open(fname
, O_WRONLY
| O_TRUNC
);
2279 dprintf(f
, "%d", opts
.oom_score_adj
);
2293 static int jail_oci_state
= OCI_STATE_CREATED
;
2294 static void pipe_send_start_container(struct uloop_timeout
*t
);
2295 static struct uloop_timeout start_container_timeout
= {
2296 .cb
= pipe_send_start_container
,
2299 static int handle_start(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2300 struct ubus_request_data
*req
, const char *method
,
2301 struct blob_attr
*msg
)
2303 if (jail_oci_state
!= OCI_STATE_CREATED
)
2304 return UBUS_STATUS_INVALID_ARGUMENT
;
2306 uloop_timeout_add(&start_container_timeout
);
2308 return UBUS_STATUS_OK
;
2311 static struct blob_buf bb
;
2312 static int handle_state(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2313 struct ubus_request_data
*req
, const char *method
,
2314 struct blob_attr
*msg
)
2318 switch (jail_oci_state
) {
2319 case OCI_STATE_CREATING
:
2320 statusstr
= "creating";
2322 case OCI_STATE_CREATED
:
2323 statusstr
= "created";
2325 case OCI_STATE_RUNNING
:
2326 statusstr
= "running";
2328 case OCI_STATE_STOPPED
:
2329 statusstr
= "stopped";
2332 statusstr
= "unknown";
2335 blob_buf_init(&bb
, 0);
2336 blobmsg_add_string(&bb
, "ociVersion", OCI_VERSION_STRING
);
2337 blobmsg_add_string(&bb
, "id", opts
.name
);
2338 blobmsg_add_string(&bb
, "status", statusstr
);
2339 if (jail_oci_state
== OCI_STATE_CREATED
||
2340 jail_oci_state
== OCI_STATE_RUNNING
)
2341 blobmsg_add_u32(&bb
, "pid", jail_process
.pid
);
2343 blobmsg_add_string(&bb
, "bundle", opts
.ocibundle
);
2345 if (opts
.annotations
)
2346 blobmsg_add_blob(&bb
, opts
.annotations
);
2348 ubus_send_reply(ctx
, req
, bb
.head
);
2350 return UBUS_STATUS_OK
;
2354 CONTAINER_KILL_ATTR_SIGNAL
,
2355 __CONTAINER_KILL_ATTR_MAX
,
2358 static const struct blobmsg_policy container_kill_attrs
[__CONTAINER_KILL_ATTR_MAX
] = {
2359 [CONTAINER_KILL_ATTR_SIGNAL
] = { "signal", BLOBMSG_TYPE_INT32
},
2363 container_handle_kill(struct ubus_context
*ctx
, struct ubus_object
*obj
,
2364 struct ubus_request_data
*req
, const char *method
,
2365 struct blob_attr
*msg
)
2367 struct blob_attr
*tb
[__CONTAINER_KILL_ATTR_MAX
], *cur
;
2370 blobmsg_parse(container_kill_attrs
, __CONTAINER_KILL_ATTR_MAX
, tb
, blobmsg_data(msg
), blobmsg_data_len(msg
));
2372 cur
= tb
[CONTAINER_KILL_ATTR_SIGNAL
];
2374 sig
= blobmsg_get_u32(cur
);
2376 if (jail_oci_state
== OCI_STATE_CREATING
)
2377 return UBUS_STATUS_NOT_FOUND
;
2379 if (kill(jail_process
.pid
, sig
) == 0)
2383 case EINVAL
: return UBUS_STATUS_INVALID_ARGUMENT
;
2384 case EPERM
: return UBUS_STATUS_PERMISSION_DENIED
;
2385 case ESRCH
: return UBUS_STATUS_NOT_FOUND
;
2388 return UBUS_STATUS_UNKNOWN_ERROR
;
2392 jail_writepid(pid_t pid
)
2399 _pidfile
= fopen(opts
.pidfile
, "w");
2400 if (_pidfile
== NULL
)
2403 if (fprintf(_pidfile
, "%d\n", pid
) < 0) {
2408 if (fclose(_pidfile
))
2414 static struct ubus_method container_methods
[] = {
2415 UBUS_METHOD_NOARG("start", handle_start
),
2416 UBUS_METHOD_NOARG("state", handle_state
),
2417 UBUS_METHOD("kill", container_handle_kill
, container_kill_attrs
),
2420 static struct ubus_object_type container_object_type
=
2421 UBUS_OBJECT_TYPE("container", container_methods
);
2423 static struct ubus_object container_object
= {
2424 .type
= &container_object_type
,
2425 .methods
= container_methods
,
2426 .n_methods
= ARRAY_SIZE(container_methods
),
2429 static void post_main(struct uloop_timeout
*t
);
2430 static struct uloop_timeout post_main_timeout
= {
2433 static int netns_fd
;
2434 static int pidns_fd
;
2435 #ifdef CLONE_NEWTIME
2436 static int timens_fd
;
2438 static void post_create_runtime(void);
2439 int main(int argc
, char **argv
)
2441 uid_t uid
= getuid();
2442 const char log
[] = "/dev/log";
2443 const char ubus
[] = "/var/run/ubus/ubus.sock";
2447 ERROR("not root, aborting: %m\n");
2448 return EXIT_FAILURE
;
2453 init_library_search();
2455 exit_from_child
= false;
2457 while ((ch
= getopt(argc
, argv
, OPT_ARGS
)) != -1) {
2460 debug
= atoi(optarg
);
2463 opts
.namespace |= CLONE_NEWNS
;
2467 opts
.namespace |= CLONE_NEWNS
;
2471 opts
.namespace |= CLONE_NEWUSER
;
2474 opts
.namespace |= CLONE_NEWCGROUP
;
2477 opts
.extroot
= optarg
;
2480 opts
.namespace |= CLONE_NEWNS
;
2484 opts
.seccomp
= optarg
;
2485 add_mount_bind(optarg
, 1, -1);
2488 opts
.capabilities
= optarg
;
2491 opts
.no_new_privs
= 1;
2497 opts
.namespace |= CLONE_NEWNET
;
2500 opts
.namespace |= CLONE_NEWUTS
;
2501 opts
.hostname
= strdup(optarg
);
2504 opts
.namespace |= CLONE_NEWNS
;
2505 add_path_and_deps(optarg
, 1, 0, 0);
2508 opts
.namespace |= CLONE_NEWNS
;
2509 add_path_and_deps(optarg
, 0, 0, 0);
2512 opts
.namespace |= CLONE_NEWNS
;
2513 add_mount_bind(ubus
, 0, -1);
2516 opts
.namespace |= CLONE_NEWNS
;
2517 add_mount_bind(log
, 0, -1);
2523 opts
.group
= optarg
;
2526 opts
.overlaydir
= optarg
;
2529 opts
.tmpoverlaysize
= optarg
;
2532 opts
.require_jail
= 1;
2538 opts
.ocibundle
= optarg
;
2541 opts
.immediately
= true;
2544 opts
.pidfile
= optarg
;
2549 if (opts
.namespace && !opts
.ocibundle
)
2550 opts
.namespace |= CLONE_NEWIPC
| CLONE_NEWPID
;
2552 /* those are filehandlers, so -1 indicates unused */
2553 opts
.setns
.pid
= -1;
2554 opts
.setns
.net
= -1;
2556 opts
.setns
.ipc
= -1;
2557 opts
.setns
.uts
= -1;
2558 opts
.setns
.user
= -1;
2559 opts
.setns
.cgroup
= -1;
2560 #ifdef CLONE_NEWTIME
2561 opts
.setns
.time
= -1;
2565 * uid in parent user namespace representing root user in new
2566 * user namespace, defaults to nobody unless specified in uidMappings
2568 opts
.root_map_uid
= 65534;
2570 if (opts
.capabilities
&& parseOCIcapabilities_from_file(&opts
.capset
, opts
.capabilities
)) {
2571 ERROR("failed to read capabilities from file %s\n", opts
.capabilities
);
2576 if (opts
.ocibundle
) {
2581 ERROR("OCI bundle needs a named jail\n");
2585 asprintf(&jsonfile
, "%s/config.json", opts
.ocibundle
);
2586 ocires
= parseOCI(jsonfile
);
2589 ERROR("parsing of OCI JSON spec has failed: %s (%d)\n", strerror(ocires
), ocires
);
2595 if (opts
.namespace & CLONE_NEWNET
) {
2597 ERROR("netns needs a named jail\n");
2604 if (opts
.tmpoverlaysize
&& strlen(opts
.tmpoverlaysize
) > 8) {
2605 ERROR("size parameter too long: \"%s\"\n", opts
.tmpoverlaysize
);
2610 /* no <binary> param found */
2611 if (!opts
.ocibundle
&& (argc
- optind
< 1)) {
2616 if (!(opts
.ocibundle
||opts
.namespace||opts
.capabilities
||opts
.seccomp
)) {
2617 ERROR("Not using namespaces, capabilities or seccomp !!!\n\n");
2622 DEBUG("Using namespaces(0x%08x), capabilities(%d), seccomp(%d)\n",
2625 opts
.seccomp
!= 0 || opts
.ociseccomp
!= 0);
2630 parent_ctx
= ubus_connect(NULL
);
2631 ubus_add_uloop(parent_ctx
);
2633 if (opts
.ocibundle
) {
2635 if (asprintf(&objname
, "container.%s", opts
.name
) < 0) {
2640 container_object
.name
= objname
;
2641 ret
= ubus_add_object(parent_ctx
, &container_object
);
2643 ERROR("Failed to add object: %s\n", ubus_strerror(ret
));
2649 /* deliberately not using 'else' on unrelated conditional branches */
2650 if (!opts
.ocibundle
) {
2651 /* allocate NULL-terminated array for argv */
2652 opts
.jail_argv
= calloc(1 + argc
- optind
, sizeof(char**));
2653 if (!opts
.jail_argv
) {
2657 for (size_t s
= optind
; s
< argc
; s
++)
2658 opts
.jail_argv
[s
- optind
] = strdup(argv
[s
]);
2660 if (opts
.namespace & CLONE_NEWUSER
)
2661 get_jail_user(&opts
.pw_uid
, &opts
.pw_gid
, &opts
.gr_gid
);
2664 if (!opts
.extroot
) {
2665 if (opts
.namespace && add_path_and_deps(*opts
.jail_argv
, 1, -1, 0)) {
2666 ERROR("failed to load dependencies\n");
2672 if (opts
.namespace && opts
.seccomp
&& add_path_and_deps("libpreload-seccomp.so", 1, -1, 1)) {
2673 ERROR("failed to load libpreload-seccomp.so\n");
2675 if (opts
.require_jail
) {
2681 uloop_timeout_add(&post_main_timeout
);
2693 static void post_main(struct uloop_timeout
*t
)
2695 if (apply_rlimits()) {
2696 ERROR("error applying resource limits\n");
2697 free_and_exit(EXIT_FAILURE
);
2701 prctl(PR_SET_NAME
, opts
.name
, NULL
, NULL
, NULL
);
2703 if (pipe(&pipes
[0]) < 0 || pipe(&pipes
[2]) < 0)
2706 if (has_namespaces()) {
2707 if (opts
.namespace & CLONE_NEWNS
) {
2708 if (!opts
.extroot
&& (opts
.user
|| opts
.group
)) {
2709 add_mount_bind("/etc/passwd", 1, -1);
2710 add_mount_bind("/etc/group", 1, -1);
2713 #if defined(__GLIBC__)
2715 add_mount_bind("/etc/nsswitch.conf", 1, -1);
2718 if (!(opts
.namespace & CLONE_NEWNET
)) {
2719 add_mount_bind("/etc/resolv.conf", 1, 0);
2720 } else if (opts
.setns
.net
== -1) {
2721 char hostdir
[PATH_MAX
];
2723 snprintf(hostdir
, PATH_MAX
, "/tmp/resolv.conf-%s.d", opts
.name
);
2724 mkdir_p(hostdir
, 0755);
2725 add_mount(hostdir
, "/dev/resolv.conf.d", NULL
, MS_BIND
| MS_NOEXEC
| MS_NOATIME
| MS_NOSUID
| MS_NODEV
| MS_RDONLY
, 0, NULL
, 0);
2728 /* default mounts */
2729 add_mount(NULL
, "/dev", "tmpfs", MS_NOATIME
| MS_NOEXEC
| MS_NOSUID
, 0, "size=1M", -1);
2730 add_mount(NULL
, "/dev/pts", "devpts", MS_NOATIME
| MS_NOEXEC
| MS_NOSUID
, 0, "newinstance,ptmxmode=0666,mode=0620,gid=5", 0);
2732 if (opts
.procfs
|| opts
.ocibundle
) {
2733 add_mount("proc", "/proc", "proc", MS_NOATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
, 0, NULL
, -1);
2736 * hack to make /proc/sys/net read-write while the rest of /proc/sys is read-only
2737 * which cannot be expressed with OCI spec, but happends to be very useful.
2738 * Only apply it if '/proc/sys' is not already listed as mount, maskedPath or
2740 * If not running in a new network namespace, only make /proc/sys read-only.
2741 * If running in a new network namespace, temporarily stash (ie. mount-bind)
2742 * /proc/sys/net into (totally unrelated, but surely existing) /proc/self/net.
2743 * Then we mount-bind /proc/sys read-only and then mount-move /proc/self/net into
2745 * This works because mounts are executed in incrementing strcmp() order and
2746 * /proc/self/net appears there before /proc/sys/net and hence the operation
2747 * succeeds as the bind-mount of /proc/self/net is performed first and then
2748 * move-mount of /proc/sys/net follows because 'e' preceeds 'y' in the ASCII
2749 * table (and in the alphabet).
2751 if (!add_mount(NULL
, "/proc/sys", NULL
, MS_BIND
| MS_RDONLY
, 0, NULL
, -1))
2752 if (opts
.namespace & CLONE_NEWNET
)
2753 if (!add_mount_inner("/proc/self/net", "/proc/sys/net", NULL
, MS_MOVE
, 0, NULL
, -1))
2754 add_mount_inner("/proc/sys/net", "/proc/self/net", NULL
, MS_BIND
, 0, NULL
, -1);
2757 if (opts
.sysfs
|| opts
.ocibundle
)
2758 add_mount("sysfs", "/sys", "sysfs", MS_RELATIME
| MS_NODEV
| MS_NOEXEC
| MS_NOSUID
| MS_RDONLY
, 0, NULL
, -1);
2761 add_mount("shm", "/dev/shm", "tmpfs", MS_NOSUID
| MS_NOEXEC
| MS_NODEV
, 0, "mode=1777", -1);
2765 if (opts
.setns
.pid
!= -1) {
2766 pidns_fd
= ns_open_pid("pid", getpid());
2767 setns_open(CLONE_NEWPID
);
2772 #ifdef CLONE_NEWTIME
2773 if (opts
.setns
.time
!= -1) {
2774 timens_fd
= ns_open_pid("time", getpid());
2775 setns_open(CLONE_NEWTIME
);
2779 if (opts
.namespace & CLONE_NEWUSER
) {
2780 if (prctl(PR_SET_SECUREBITS
, SECBIT_NO_SETUID_FIXUP
)) {
2781 ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
2782 free_and_exit(EXIT_FAILURE
);
2784 seteuid(opts
.root_map_uid
);
2787 jail_process
.pid
= clone(exec_jail
, child_stack
+ STACK_SIZE
, SIGCHLD
| (opts
.namespace & (~CLONE_NEWCGROUP
)), NULL
);
2789 jail_process
.pid
= fork();
2792 if (jail_process
.pid
> 0) {
2793 /* parent process */
2796 uloop_process_add(&jail_process
);
2799 prctl(PR_SET_SECUREBITS
, 0);
2801 if (pidns_fd
!= -1) {
2802 setns(pidns_fd
, CLONE_NEWPID
);
2805 #ifdef CLONE_NEWTIME
2806 if (timens_fd
!= -1)
2807 setns(timens_fd
, CLONE_NEWTIME
);
2811 if (opts
.setns
.net
!= -1)
2812 close(opts
.setns
.net
);
2813 if (opts
.setns
.ns
!= -1)
2814 close(opts
.setns
.ns
);
2815 if (opts
.setns
.ipc
!= -1)
2816 close(opts
.setns
.ipc
);
2817 if (opts
.setns
.uts
!= -1)
2818 close(opts
.setns
.uts
);
2819 if (opts
.setns
.user
!= -1)
2820 close(opts
.setns
.user
);
2821 if (opts
.setns
.cgroup
!= -1)
2822 close(opts
.setns
.cgroup
);
2825 if (read(pipes
[0], sig_buf
, 1) < 1) {
2826 ERROR("can't read from child\n");
2830 set_oom_score_adj();
2833 cgroups_apply(jail_process
.pid
);
2835 if (opts
.namespace & CLONE_NEWUSER
) {
2836 if (write_setgroups(jail_process
.pid
, true)) {
2837 ERROR("can't write setgroups\n");
2841 bool has_gr
= (opts
.gr_gid
!= -1);
2842 if (opts
.pw_uid
!= -1) {
2843 write_single_uid_gid_map(jail_process
.pid
, 0, opts
.pw_uid
);
2844 write_single_uid_gid_map(jail_process
.pid
, 1, has_gr
?opts
.gr_gid
:opts
.pw_gid
);
2846 write_single_uid_gid_map(jail_process
.pid
, 0, 65534);
2847 write_single_uid_gid_map(jail_process
.pid
, 1, has_gr
?opts
.gr_gid
:65534);
2850 write_uid_gid_map(jail_process
.pid
, 0, opts
.uidmap
);
2852 write_uid_gid_map(jail_process
.pid
, 1, opts
.gidmap
);
2856 if (opts
.namespace & CLONE_NEWNET
) {
2857 netns_fd
= ns_open_pid("net", jail_process
.pid
);
2858 netns_updown(jail_process
.pid
, true);
2861 if (jail_writepid(jail_process
.pid
)) {
2862 ERROR("failed to write pidfile: %m\n");
2865 } else if (jail_process
.pid
== 0) {
2866 /* fork child process */
2867 free_and_exit(exec_jail(NULL
));
2869 ERROR("failed to clone/fork: %m\n");
2870 free_and_exit(EXIT_FAILURE
);
2872 run_hooks(opts
.hooks
.createRuntime
, post_create_runtime
);
2875 static void post_poststart(void);
2876 static void post_create_runtime(void)
2881 if (write(pipes
[3], sig_buf
, 1) < 0) {
2882 ERROR("can't write to child\n");
2886 jail_oci_state
= OCI_STATE_CREATED
;
2887 if (opts
.ocibundle
&& !opts
.immediately
)
2888 uloop_run(); /* wait for 'start' command via ubus */
2890 pipe_send_start_container(NULL
);
2893 static void pipe_send_start_container(struct uloop_timeout
*t
)
2897 jail_oci_state
= OCI_STATE_RUNNING
;
2899 if (write(pipes
[3], sig_buf
, 1) < 0) {
2900 ERROR("can't write to child\n");
2905 run_hooks(opts
.hooks
.poststart
, post_poststart
);
2908 static void post_poststart(void)
2910 uloop_run(); /* idle here while jail is running */
2912 DEBUG("uloop interrupted, killing jail process\n");
2913 kill(jail_process
.pid
, SIGTERM
);
2914 uloop_timeout_set(&jail_process_timeout
, 1000);
2921 static void post_poststop(void);
2922 static void poststop(void) {
2923 if (opts
.namespace & CLONE_NEWNET
) {
2924 setns(netns_fd
, CLONE_NEWNET
);
2925 netns_updown(getpid(), false);
2928 run_hooks(opts
.hooks
.poststop
, post_poststop
);
2931 static void post_poststop(void)
2935 ubus_free(parent_ctx
);
2937 exit(jail_return_code
);