Elly Jones | e58176c | 2012-01-23 11:46:17 -0500 | [diff] [blame] | 1 | /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 2 | * Use of this source code is governed by a BSD-style license that can be |
Will Drewry | 32ac9f5 | 2011-08-18 21:36:27 -0500 | [diff] [blame] | 3 | * found in the LICENSE file. |
| 4 | */ |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | #include <unistd.h> |
| 10 | |
| 11 | #include "libminijail.h" |
Will Drewry | 32ac9f5 | 2011-08-18 21:36:27 -0500 | [diff] [blame] | 12 | #include "libsyscalls.h" |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 13 | |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 14 | #include "util.h" |
| 15 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 16 | static void set_user(struct minijail *j, const char *arg) |
| 17 | { |
| 18 | char *end = NULL; |
| 19 | int uid = strtod(arg, &end); |
| 20 | if (!*end && *arg) { |
| 21 | minijail_change_uid(j, uid); |
| 22 | return; |
| 23 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 24 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 25 | if (minijail_change_user(j, arg)) { |
| 26 | fprintf(stderr, "Bad user: '%s'\n", arg); |
| 27 | exit(1); |
| 28 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 29 | } |
| 30 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 31 | static void set_group(struct minijail *j, const char *arg) |
| 32 | { |
| 33 | char *end = NULL; |
| 34 | int gid = strtod(arg, &end); |
| 35 | if (!*end && *arg) { |
| 36 | minijail_change_gid(j, gid); |
| 37 | return; |
| 38 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 39 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 40 | if (minijail_change_group(j, arg)) { |
| 41 | fprintf(stderr, "Bad group: '%s'\n", arg); |
| 42 | exit(1); |
| 43 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 44 | } |
| 45 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 46 | static void use_caps(struct minijail *j, const char *arg) |
| 47 | { |
| 48 | uint64_t caps; |
| 49 | char *end = NULL; |
| 50 | caps = strtoull(arg, &end, 16); |
| 51 | if (*end) { |
| 52 | fprintf(stderr, "Invalid cap set: '%s'\n", arg); |
| 53 | exit(1); |
| 54 | } |
| 55 | minijail_use_caps(j, caps); |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 56 | } |
| 57 | |
Elly Jones | 51a5b6c | 2011-10-12 19:09:26 -0400 | [diff] [blame] | 58 | static void add_binding(struct minijail *j, char *arg) { |
| 59 | char *src = strtok(arg, ","); |
Elly Jones | 5ba42b5 | 2011-12-07 13:31:43 -0500 | [diff] [blame] | 60 | char *dest = strtok(NULL, ","); |
| 61 | char *flags = strtok(NULL, ","); |
Elly Jones | 51a5b6c | 2011-10-12 19:09:26 -0400 | [diff] [blame] | 62 | if (!src || !dest) { |
| 63 | fprintf(stderr, "Bad binding: %s %s\n", src, dest); |
| 64 | exit(1); |
| 65 | } |
| 66 | if (minijail_bind(j, src, dest, flags ? atoi(flags) : 0)) { |
| 67 | fprintf(stderr, "Bind failure\n"); |
| 68 | exit(1); |
| 69 | } |
| 70 | } |
| 71 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 72 | static void usage(const char *progn) |
| 73 | { |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 74 | size_t i; |
| 75 | |
Jorge Lucangeli Obes | c2c9bcc | 2012-05-01 09:30:24 -0700 | [diff] [blame] | 76 | printf("Usage: %s [-Ghnprsv] [-b <src>,<dest>[,<writeable>]] " |
| 77 | "[-c <caps>] [-C <dir>] [-g <group>] [-S <file>] [-u <user>] " |
| 78 | "<program> [args...]\n" |
Elly Jones | a8d1e1b | 2011-10-21 15:38:00 -0400 | [diff] [blame] | 79 | " -b: binds <src> to <dest> in chroot. Multiple " |
| 80 | "instances allowed\n" |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 81 | " -c <caps>: restrict caps to <caps>\n" |
Elly Jones | a8d1e1b | 2011-10-21 15:38:00 -0400 | [diff] [blame] | 82 | " -C <dir>: chroot to <dir>\n" |
Elly Fong-Jones | 6c08630 | 2013-03-20 17:15:28 -0400 | [diff] [blame] | 83 | " -e enter a network namespace\n" |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 84 | " -G: inherit secondary groups from uid\n" |
| 85 | " -g <group>: change gid to <group>\n" |
| 86 | " -h: help (this message)\n" |
| 87 | " -H: seccomp filter help message\n" |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 88 | " -L: log blocked syscalls when using seccomp filter. " |
| 89 | "Forces the following syscalls to be allowed:\n" |
| 90 | " ", progn); |
| 91 | for (i = 0; i < log_syscalls_len; i++) |
| 92 | printf("%s ", log_syscalls[i]); |
| 93 | |
| 94 | printf("\n" |
Jorge Lucangeli Obes | c2c9bcc | 2012-05-01 09:30:24 -0700 | [diff] [blame] | 95 | " -n: set no_new_privs\n" |
Elly Jones | e58176c | 2012-01-23 11:46:17 -0500 | [diff] [blame] | 96 | " -p: use pid namespace (implies -vr)\n" |
Elly Jones | fdd5f2d | 2012-01-23 13:27:43 -0500 | [diff] [blame] | 97 | " -r: remount /proc readonly (implies -v)\n" |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 98 | " -s: use seccomp\n" |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 99 | " -S <file>: set seccomp filter using <file>\n" |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 100 | " E.g., -S /usr/share/filters/<prog>.$(uname -m)\n" |
| 101 | " -u <user>: change uid to <user>\n" |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 102 | " -v: use vfs namespace\n"); |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 103 | } |
| 104 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 105 | static void seccomp_filter_usage(const char *progn) |
| 106 | { |
| 107 | const struct syscall_entry *entry = syscall_table; |
| 108 | printf("Usage: %s -S <policy.file> <program> [args...]\n\n" |
| 109 | "System call names supported:\n", progn); |
| 110 | for (; entry->name && entry->nr >= 0; ++entry) |
| 111 | printf(" %s [%d]\n", entry->name, entry->nr); |
| 112 | printf("\nSee minijail0(5) for example policies.\n"); |
Will Drewry | 32ac9f5 | 2011-08-18 21:36:27 -0500 | [diff] [blame] | 113 | } |
| 114 | |
Elly Fong-Jones | f65c9fe | 2013-01-22 13:55:02 -0500 | [diff] [blame] | 115 | static int parse_args(struct minijail *j, int argc, char *argv[]) |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 116 | { |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 117 | int opt; |
Elly Fong-Jones | f65c9fe | 2013-01-22 13:55:02 -0500 | [diff] [blame] | 118 | if (argc > 1 && argv[1][0] != '-') |
| 119 | return 1; |
Elly Fong-Jones | 6c08630 | 2013-03-20 17:15:28 -0400 | [diff] [blame] | 120 | while ((opt = getopt(argc, argv, "u:g:sS:c:C:b:vrGhHnpLe")) != -1) { |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 121 | switch (opt) { |
| 122 | case 'u': |
| 123 | set_user(j, optarg); |
| 124 | break; |
| 125 | case 'g': |
| 126 | set_group(j, optarg); |
| 127 | break; |
Jorge Lucangeli Obes | c2c9bcc | 2012-05-01 09:30:24 -0700 | [diff] [blame] | 128 | case 'n': |
| 129 | minijail_no_new_privs(j); |
Jorge Lucangeli Obes | 0341d6c | 2012-07-16 15:27:31 -0700 | [diff] [blame] | 130 | break; |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 131 | case 's': |
| 132 | minijail_use_seccomp(j); |
| 133 | break; |
| 134 | case 'S': |
| 135 | minijail_parse_seccomp_filters(j, optarg); |
| 136 | minijail_use_seccomp_filter(j); |
| 137 | break; |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 138 | case 'L': |
| 139 | minijail_log_seccomp_filter_failures(j); |
| 140 | break; |
Elly Jones | 51a5b6c | 2011-10-12 19:09:26 -0400 | [diff] [blame] | 141 | case 'b': |
| 142 | add_binding(j, optarg); |
| 143 | break; |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 144 | case 'c': |
| 145 | use_caps(j, optarg); |
| 146 | break; |
Elly Jones | 51a5b6c | 2011-10-12 19:09:26 -0400 | [diff] [blame] | 147 | case 'C': |
| 148 | minijail_enter_chroot(j, optarg); |
| 149 | break; |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 150 | case 'v': |
| 151 | minijail_namespace_vfs(j); |
| 152 | break; |
| 153 | case 'r': |
| 154 | minijail_remount_readonly(j); |
| 155 | break; |
| 156 | case 'G': |
| 157 | minijail_inherit_usergroups(j); |
| 158 | break; |
| 159 | case 'p': |
| 160 | minijail_namespace_pids(j); |
| 161 | break; |
Elly Fong-Jones | 6c08630 | 2013-03-20 17:15:28 -0400 | [diff] [blame] | 162 | case 'e': |
| 163 | minijail_namespace_net(j); |
| 164 | break; |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 165 | case 'H': |
| 166 | seccomp_filter_usage(argv[0]); |
| 167 | exit(1); |
| 168 | default: |
| 169 | usage(argv[0]); |
| 170 | exit(1); |
| 171 | } |
Elly Fong-Jones | f65c9fe | 2013-01-22 13:55:02 -0500 | [diff] [blame] | 172 | if (optind < argc && argv[optind][0] != '-') |
| 173 | return optind; |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 174 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 175 | |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 176 | if (argc == optind) { |
| 177 | usage(argv[0]); |
| 178 | exit(1); |
| 179 | } |
Elly Fong-Jones | f65c9fe | 2013-01-22 13:55:02 -0500 | [diff] [blame] | 180 | return optind; |
| 181 | } |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 182 | |
Elly Fong-Jones | f65c9fe | 2013-01-22 13:55:02 -0500 | [diff] [blame] | 183 | int main(int argc, char *argv[]) |
| 184 | { |
| 185 | struct minijail *j = minijail_new(); |
| 186 | int consumed = parse_args(j, argc, argv); |
| 187 | argc -= consumed; |
| 188 | argv += consumed; |
Elly Fong-Jones | 6d71785 | 2013-03-19 16:29:03 -0400 | [diff] [blame] | 189 | if (access(argv[0], X_OK)) { |
| 190 | fprintf(stderr, "Target program '%s' not accessible\n", |
| 191 | argv[0]); |
| 192 | return 1; |
| 193 | } |
Elly Jones | e1749eb | 2011-10-07 13:54:59 -0400 | [diff] [blame] | 194 | minijail_run(j, argv[0], argv); |
| 195 | return minijail_wait(j); |
Elly Jones | cd7a904 | 2011-07-22 13:56:51 -0400 | [diff] [blame] | 196 | } |