| /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* |
| * The general pattern of use here: |
| * 1) Construct a minijail with minijail_new() |
| * 2) Apply the desired restrictions to it |
| * 3) Enter it, which locks the current process inside it, or: |
| * 3) Run a process inside it |
| * 4) Destroy it. |
| */ |
| |
| #ifndef _LIBMINIJAIL_H_ |
| #define _LIBMINIJAIL_H_ |
| |
| #include <stdint.h> |
| #include <sys/types.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| enum { |
| MINIJAIL_ERR_PRELOAD = 252, |
| MINIJAIL_ERR_JAIL = 253, |
| MINIJAIL_ERR_INIT = 254, |
| }; |
| |
| struct minijail; |
| |
| /* Allocates a new minijail with no restrictions. */ |
| struct minijail *minijail_new(void); |
| |
| /* |
| * These functions add restrictions to the minijail. They are not applied until |
| * minijail_enter() is called. See the documentation in minijail0.1 for |
| * explanations in detail of what the restrictions do. |
| */ |
| void minijail_change_uid(struct minijail *j, uid_t uid); |
| void minijail_change_gid(struct minijail *j, gid_t gid); |
| /* Copies |list|. */ |
| void minijail_set_supplementary_gids(struct minijail *j, size_t size, |
| const gid_t *list); |
| /* Stores user to change to and copies |user| for internal consistency. */ |
| int minijail_change_user(struct minijail *j, const char *user); |
| /* Does not take ownership of |group|. */ |
| int minijail_change_group(struct minijail *j, const char *group); |
| void minijail_use_seccomp(struct minijail *j); |
| void minijail_no_new_privs(struct minijail *j); |
| void minijail_use_seccomp_filter(struct minijail *j); |
| void minijail_parse_seccomp_filters(struct minijail *j, const char *path); |
| void minijail_log_seccomp_filter_failures(struct minijail *j); |
| /* 'minijail_use_caps' and 'minijail_capbset_drop' are mutually exclusive. */ |
| void minijail_use_caps(struct minijail *j, uint64_t capmask); |
| void minijail_capbset_drop(struct minijail *j, uint64_t capmask); |
| void minijail_reset_signal_mask(struct minijail *j); |
| void minijail_namespace_vfs(struct minijail *j); |
| void minijail_namespace_enter_vfs(struct minijail *j, const char *ns_path); |
| /* |
| * This option is *dangerous* as it negates most of the functionality of |
| * minijail_namespace_vfs(). You very likely don't need this. |
| */ |
| void minijail_skip_remount_private(struct minijail *j); |
| void minijail_namespace_ipc(struct minijail *j); |
| void minijail_namespace_net(struct minijail *j); |
| void minijail_namespace_enter_net(struct minijail *j, const char *ns_path); |
| /* |
| * Implies namespace_vfs and remount_proc_readonly. |
| * WARNING: this is NOT THREAD SAFE. See the block comment in </libminijail.c>. |
| */ |
| void minijail_namespace_pids(struct minijail *j); |
| void minijail_namespace_user(struct minijail *j); |
| int minijail_uidmap(struct minijail *j, const char *uidmap); |
| int minijail_gidmap(struct minijail *j, const char *gidmap); |
| void minijail_remount_proc_readonly(struct minijail *j); |
| void minijail_run_as_init(struct minijail *j); |
| int minijail_write_pid_file(struct minijail *j, const char *path); |
| void minijail_inherit_usergroups(struct minijail *j); |
| void minijail_disable_ptrace(struct minijail *j); |
| /* |
| * Changes the jailed process's syscall table to the alt_syscall table |
| * named |table|. |
| */ |
| int minijail_use_alt_syscall(struct minijail *j, const char *table); |
| |
| /* |
| * Adds the jailed process to the cgroup given by |path|. |path| should be the |
| * full path to the cgroups "tasks" file. |
| * Example: /sys/fs/cgroup/cpu/jailed_procs/tasks adds to the "jailed_procs" cpu |
| * cgroup. |
| */ |
| int minijail_add_to_cgroup(struct minijail *j, const char *path); |
| |
| /* |
| * minijail_enter_chroot: enables chroot() restriction for @j |
| * @j minijail to apply restriction to |
| * @dir directory to chroot() to. Owned by caller. |
| * |
| * Enters @dir, binding all bind mounts specified with minijail_bind() into |
| * place. Requires @dir to contain all necessary directories for bind mounts |
| * (i.e., if you have requested a bind mount at /etc, /etc must exist in @dir.) |
| * |
| * Returns 0 on success. |
| */ |
| int minijail_enter_chroot(struct minijail *j, const char *dir); |
| int minijail_enter_pivot_root(struct minijail *j, const char *dir); |
| |
| /* |
| * minijail_get_original_path: returns the path of a given file outside of the |
| * chroot. |
| * @j minijail to obtain the path from. |
| * @chroot_path path inside of the chroot() to. |
| * |
| * When executing a binary in a chroot or pivot_root, return path to the binary |
| * outside of the chroot. |
| * |
| * Returns a string containing the path. This must be freed by the caller. |
| */ |
| char *minijail_get_original_path(struct minijail *j, const char *chroot_path); |
| |
| /* |
| * minijail_mount_tmp: enables mounting of a tmpfs filesystem on /tmp. |
| * As be rules of bind mounts, /tmp must exist in chroot. |
| */ |
| void minijail_mount_tmp(struct minijail *j); |
| |
| /* |
| * minijail_mount: when entering minijail @j, mounts @src at @dst with @flags |
| * @j minijail to bind inside |
| * @src source to bind |
| * @dest location to bind (inside chroot) |
| * @type type of filesystem |
| * @flags flags passed to mount |
| * |
| * This may be called multiple times; all bindings will be applied in the order |
| * of minijail_mount() calls. |
| */ |
| int minijail_mount(struct minijail *j, const char *src, const char *dest, |
| const char *type, unsigned long flags); |
| |
| /* |
| * minijail_bind: bind-mounts @src into @j as @dest, optionally writeable |
| * @j minijail to bind inside |
| * @src source to bind |
| * @dest location to bind (inside chroot) |
| * @writeable 1 if the bind mount should be writeable |
| * |
| * This may be called multiple times; all bindings will be applied in the order |
| * of minijail_bind() calls. |
| */ |
| int minijail_bind(struct minijail *j, const char *src, const char *dest, |
| int writeable); |
| |
| /* |
| * Lock this process into the given minijail. Note that this procedure cannot fail, |
| * since there is no way to undo privilege-dropping; therefore, if any part of |
| * the privilege-drop fails, minijail_enter() will abort the entire process. |
| * |
| * Some restrictions cannot be enabled this way (pid namespaces) and attempting |
| * to do so will cause an abort. |
| */ |
| void minijail_enter(const struct minijail *j); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. This is |
| * required if minijail_namespace_pids() was used. |
| */ |
| int minijail_run(struct minijail *j, const char *filename, |
| char *const argv[]); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. |
| * Used with static binaries, or on systems without support for LD_PRELOAD. |
| */ |
| int minijail_run_no_preload(struct minijail *j, const char *filename, |
| char *const argv[]); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. |
| * Update |*pchild_pid| with the pid of the child. |
| */ |
| int minijail_run_pid(struct minijail *j, const char *filename, |
| char *const argv[], pid_t *pchild_pid); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. |
| * Update |*pstdin_fd| with a fd that allows writing to the child's |
| * standard input. |
| */ |
| int minijail_run_pipe(struct minijail *j, const char *filename, |
| char *const argv[], int *pstdin_fd); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. |
| * Update |*pchild_pid| with the pid of the child. |
| * Update |*pstdin_fd| with a fd that allows writing to the child's |
| * standard input. |
| * Update |*pstdout_fd| with a fd that allows reading from the child's |
| * standard output. |
| * Update |*pstderr_fd| with a fd that allows reading from the child's |
| * standard error. |
| */ |
| int minijail_run_pid_pipes(struct minijail *j, const char *filename, |
| char *const argv[], pid_t *pchild_pid, |
| int *pstdin_fd, int *pstdout_fd, int *pstderr_fd); |
| |
| /* |
| * Run the specified command in the given minijail, execve(2)-style. |
| * Update |*pchild_pid| with the pid of the child. |
| * Update |*pstdin_fd| with a fd that allows writing to the child's |
| * standard input. |
| * Update |*pstdout_fd| with a fd that allows reading from the child's |
| * standard output. |
| * Update |*pstderr_fd| with a fd that allows reading from the child's |
| * standard error. |
| * Used with static binaries, or on systems without support for LD_PRELOAD. |
| */ |
| int minijail_run_pid_pipes_no_preload(struct minijail *j, const char *filename, |
| char *const argv[], pid_t *pchild_pid, |
| int *pstdin_fd, int *pstdout_fd, |
| int *pstderr_fd); |
| |
| /* |
| * Kill the specified minijail. The minijail must have been created with pid |
| * namespacing; if it was, all processes inside it are atomically killed. |
| */ |
| int minijail_kill(struct minijail *j); |
| |
| /* |
| * Wait for all processed in the specified minijail to exit. Returns the exit |
| * status of the _first_ process spawned in the jail. |
| */ |
| int minijail_wait(struct minijail *j); |
| |
| /* |
| * Frees the given minijail. It does not matter if the process is inside the minijail or |
| * not. |
| */ |
| void minijail_destroy(struct minijail *j); |
| |
| #ifdef __cplusplus |
| }; /* extern "C" */ |
| #endif |
| |
| #endif /* !_LIBMINIJAIL_H_ */ |