| Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame^] | 1 | /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| 2 | * Use of this source code is governed by a BSD-style license that can be |
| 3 | * found in the LICENSE file. */ |
| 4 | |
| 5 | /* The general pattern of use here: |
| 6 | * 1) Construct a minijail with minijail_new() |
| 7 | * 2) Apply the desired restrictions to it |
| 8 | * 3) Enter it, which locks the current process inside it, or: |
| 9 | * 3) Run a process inside it |
| 10 | * 4) Destroy it. |
| 11 | */ |
| 12 | |
| 13 | #ifndef LIBMINIJAIL_H_ |
| 14 | #define LIBMINIJAIL_H_ |
| 15 | |
| 16 | #include <stdint.h> |
| 17 | #include <sys/types.h> |
| 18 | |
| 19 | #ifdef __cplusplus |
| 20 | extern "C" { |
| 21 | #endif |
| 22 | |
| 23 | enum { |
| 24 | MINIJAIL_ERR_PRELOAD = 252, |
| 25 | MINIJAIL_ERR_JAIL = 253, |
| 26 | MINIJAIL_ERR_INIT = 254, |
| 27 | }; |
| 28 | |
| 29 | struct minijail; |
| 30 | |
| 31 | /* Allocates a new minijail with no restrictions. */ |
| 32 | struct minijail *minijail_new(void); |
| 33 | |
| 34 | /* These functions add restrictions to the minijail. They are not applied until |
| 35 | * minijail_enter() is called. See the documentation in minijail0.1 for |
| 36 | * explanations in detail of what the restrictions do. */ |
| 37 | void minijail_change_uid(struct minijail *j, uid_t uid); |
| 38 | void minijail_change_gid(struct minijail *j, gid_t gid); |
| 39 | /* 'user' should be kept valid until minijail_destroy() */ |
| 40 | int minijail_change_user(struct minijail *j, const char *user); |
| 41 | /* 'group' should be kept valid until minijail_destroy() */ |
| 42 | int minijail_change_group(struct minijail *j, const char *group); |
| 43 | void minijail_use_seccomp(struct minijail *j); |
| 44 | void minijail_use_caps(struct minijail *j, uint64_t capmask); |
| 45 | void minijail_namespace_vfs(struct minijail *j); |
| 46 | void minijail_namespace_pids(struct minijail *j); |
| 47 | void minijail_remount_readonly(struct minijail *j); |
| 48 | void minijail_inherit_usergroups(struct minijail *j); |
| 49 | void minijail_disable_ptrace(struct minijail *j); |
| 50 | |
| 51 | /* Lock this process into the given minijail. Note that this procedure cannot fail, |
| 52 | * since there is no way to undo privilege-dropping; therefore, if any part of |
| 53 | * the privilege-drop fails, minijail_enter() will abort the entire process. |
| 54 | * |
| 55 | * Some restrictions cannot be enabled this way (pid namespaces) and attempting |
| 56 | * to do so will cause an abort. |
| 57 | */ |
| 58 | void minijail_enter(const struct minijail *j); |
| 59 | |
| 60 | /* Run the specified command in the given minijail, execve(3)-style. This is |
| 61 | * required if minijail_namespace_pids() was used. */ |
| 62 | int minijail_run(struct minijail *j, const char *filename, char *const argv[]); |
| 63 | |
| 64 | /* Kill the specified minijail. The minijail must have been created with pid |
| 65 | * namespacing; if it was, all processes inside it are atomically killed. */ |
| 66 | int minijail_kill(struct minijail *j); |
| 67 | |
| 68 | /* Wait for all processed in the specified minijail to exit. Returns the exit |
| 69 | * status of the _first_ process spawned in the jail. */ |
| 70 | int minijail_wait(struct minijail *j); |
| 71 | |
| 72 | /* Frees the given minijail. It does not matter if the process is inside the minijail or |
| 73 | * not. */ |
| 74 | void minijail_destroy(struct minijail *j); |
| 75 | |
| 76 | #ifdef __cplusplus |
| 77 | }; /* extern "C" */ |
| 78 | #endif |
| 79 | |
| 80 | #endif /* !LIBMINIJAIL_H_ */ |