Mike Frysinger | 5ef22ca | 2018-01-20 13:42:10 -0500 | [diff] [blame] | 1 | /* Copyright 2018 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 | |
| 6 | #include <dlfcn.h> |
| 7 | #include <errno.h> |
| 8 | #include <getopt.h> |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #include <sys/capability.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <unistd.h> |
| 15 | |
| 16 | #include "libminijail.h" |
| 17 | #include "libsyscalls.h" |
| 18 | |
| 19 | #include "elfparse.h" |
| 20 | #include "minijail0_cli.h" |
| 21 | #include "system.h" |
| 22 | #include "util.h" |
| 23 | |
| 24 | #define IDMAP_LEN 32U |
| 25 | #define DEFAULT_TMP_SIZE (64 * 1024 * 1024) |
| 26 | |
| 27 | static void set_user(struct minijail *j, const char *arg, uid_t *out_uid, |
| 28 | gid_t *out_gid) |
| 29 | { |
| 30 | char *end = NULL; |
| 31 | int uid = strtod(arg, &end); |
| 32 | if (!*end && *arg) { |
| 33 | *out_uid = uid; |
| 34 | minijail_change_uid(j, uid); |
| 35 | return; |
| 36 | } |
| 37 | |
| 38 | if (lookup_user(arg, out_uid, out_gid)) { |
| 39 | fprintf(stderr, "Bad user: '%s'\n", arg); |
| 40 | exit(1); |
| 41 | } |
| 42 | |
| 43 | if (minijail_change_user(j, arg)) { |
| 44 | fprintf(stderr, "Bad user: '%s'\n", arg); |
| 45 | exit(1); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | static void set_group(struct minijail *j, const char *arg, gid_t *out_gid) |
| 50 | { |
| 51 | char *end = NULL; |
| 52 | int gid = strtod(arg, &end); |
| 53 | if (!*end && *arg) { |
| 54 | *out_gid = gid; |
| 55 | minijail_change_gid(j, gid); |
| 56 | return; |
| 57 | } |
| 58 | |
| 59 | if (lookup_group(arg, out_gid)) { |
| 60 | fprintf(stderr, "Bad group: '%s'\n", arg); |
| 61 | exit(1); |
| 62 | } |
| 63 | |
| 64 | if (minijail_change_group(j, arg)) { |
| 65 | fprintf(stderr, "Bad group: '%s'\n", arg); |
| 66 | exit(1); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static void skip_securebits(struct minijail *j, const char *arg) |
| 71 | { |
| 72 | uint64_t securebits_skip_mask; |
| 73 | char *end = NULL; |
| 74 | securebits_skip_mask = strtoull(arg, &end, 16); |
| 75 | if (*end) { |
| 76 | fprintf(stderr, "Invalid securebit mask: '%s'\n", arg); |
| 77 | exit(1); |
| 78 | } |
| 79 | minijail_skip_setting_securebits(j, securebits_skip_mask); |
| 80 | } |
| 81 | |
| 82 | static void use_caps(struct minijail *j, const char *arg) |
| 83 | { |
| 84 | uint64_t caps; |
| 85 | char *end = NULL; |
| 86 | caps = strtoull(arg, &end, 16); |
| 87 | if (*end) { |
| 88 | fprintf(stderr, "Invalid cap set: '%s'\n", arg); |
| 89 | exit(1); |
| 90 | } |
| 91 | minijail_use_caps(j, caps); |
| 92 | } |
| 93 | |
| 94 | static void add_binding(struct minijail *j, char *arg) |
| 95 | { |
| 96 | char *src = tokenize(&arg, ","); |
| 97 | char *dest = tokenize(&arg, ","); |
| 98 | char *flags = tokenize(&arg, ","); |
| 99 | if (!src || src[0] == '\0' || arg != NULL) { |
| 100 | fprintf(stderr, "Bad binding: %s %s\n", src, dest); |
| 101 | exit(1); |
| 102 | } |
| 103 | if (dest == NULL || dest[0] == '\0') |
| 104 | dest = src; |
| 105 | if (flags == NULL || flags[0] == '\0') |
| 106 | flags = "0"; |
| 107 | if (minijail_bind(j, src, dest, atoi(flags))) { |
| 108 | fprintf(stderr, "minijail_bind failed.\n"); |
| 109 | exit(1); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | static void add_rlimit(struct minijail *j, char *arg) |
| 114 | { |
| 115 | char *type = tokenize(&arg, ","); |
| 116 | char *cur = tokenize(&arg, ","); |
| 117 | char *max = tokenize(&arg, ","); |
| 118 | if (!type || type[0] == '\0' || !cur || cur[0] == '\0' || |
| 119 | !max || max[0] == '\0' || arg != NULL) { |
| 120 | fprintf(stderr, "Bad rlimit '%s'.\n", arg); |
| 121 | exit(1); |
| 122 | } |
| 123 | if (minijail_rlimit(j, atoi(type), atoi(cur), atoi(max))) { |
| 124 | fprintf(stderr, "minijail_rlimit '%s,%s,%s' failed.\n", type, |
| 125 | cur, max); |
| 126 | exit(1); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | static void add_mount(struct minijail *j, char *arg) |
| 131 | { |
| 132 | char *src = tokenize(&arg, ","); |
| 133 | char *dest = tokenize(&arg, ","); |
| 134 | char *type = tokenize(&arg, ","); |
| 135 | char *flags = tokenize(&arg, ","); |
| 136 | char *data = tokenize(&arg, ","); |
| 137 | if (!src || src[0] == '\0' || !dest || dest[0] == '\0' || |
| 138 | !type || type[0] == '\0' || arg != NULL) { |
| 139 | fprintf(stderr, "Bad mount: %s %s %s\n", src, dest, type); |
| 140 | exit(1); |
| 141 | } |
| 142 | if (minijail_mount_with_data(j, src, dest, type, |
| 143 | flags ? strtoul(flags, NULL, 16) : 0, |
| 144 | data)) { |
| 145 | fprintf(stderr, "minijail_mount failed.\n"); |
| 146 | exit(1); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static char *build_idmap(id_t id, id_t lowerid) |
| 151 | { |
| 152 | int ret; |
| 153 | char *idmap = malloc(IDMAP_LEN); |
| 154 | ret = snprintf(idmap, IDMAP_LEN, "%d %d 1", id, lowerid); |
| 155 | if (ret < 0 || (size_t)ret >= IDMAP_LEN) { |
| 156 | free(idmap); |
| 157 | fprintf(stderr, "Could not build id map.\n"); |
| 158 | exit(1); |
| 159 | } |
| 160 | return idmap; |
| 161 | } |
| 162 | |
| 163 | static int has_cap_setgid(void) |
| 164 | { |
| 165 | cap_t caps; |
| 166 | cap_flag_value_t cap_value; |
| 167 | |
| 168 | if (!CAP_IS_SUPPORTED(CAP_SETGID)) |
| 169 | return 0; |
| 170 | |
| 171 | caps = cap_get_proc(); |
| 172 | if (!caps) { |
| 173 | fprintf(stderr, "Could not get process' capabilities: %m\n"); |
| 174 | exit(1); |
| 175 | } |
| 176 | |
| 177 | if (cap_get_flag(caps, CAP_SETGID, CAP_EFFECTIVE, &cap_value)) { |
| 178 | fprintf(stderr, "Could not get the value of CAP_SETGID: %m\n"); |
| 179 | exit(1); |
| 180 | } |
| 181 | |
| 182 | if (cap_free(caps)) { |
| 183 | fprintf(stderr, "Could not free capabilities: %m\n"); |
| 184 | exit(1); |
| 185 | } |
| 186 | |
| 187 | return cap_value == CAP_SET; |
| 188 | } |
| 189 | |
| 190 | static void set_ugid_mapping(struct minijail *j, int set_uidmap, uid_t uid, |
| 191 | char *uidmap, int set_gidmap, gid_t gid, |
| 192 | char *gidmap) |
| 193 | { |
| 194 | if (set_uidmap) { |
| 195 | minijail_namespace_user(j); |
| 196 | minijail_namespace_pids(j); |
| 197 | |
| 198 | if (!uidmap) { |
| 199 | /* |
| 200 | * If no map is passed, map the current uid to the |
| 201 | * chosen uid in the target namespace (or root, if none |
| 202 | * was chosen). |
| 203 | */ |
| 204 | uidmap = build_idmap(uid, getuid()); |
| 205 | } |
| 206 | if (0 != minijail_uidmap(j, uidmap)) { |
| 207 | fprintf(stderr, "Could not set uid map.\n"); |
| 208 | exit(1); |
| 209 | } |
| 210 | free(uidmap); |
| 211 | } |
| 212 | if (set_gidmap) { |
| 213 | minijail_namespace_user(j); |
| 214 | minijail_namespace_pids(j); |
| 215 | |
| 216 | if (!gidmap) { |
| 217 | /* |
| 218 | * If no map is passed, map the current gid to the |
| 219 | * chosen gid in the target namespace. |
| 220 | */ |
| 221 | gidmap = build_idmap(gid, getgid()); |
| 222 | } |
| 223 | if (!has_cap_setgid()) { |
| 224 | /* |
| 225 | * This means that we are not running as root, |
| 226 | * so we also have to disable setgroups(2) to |
| 227 | * be able to set the gid map. |
| 228 | * See |
| 229 | * http://man7.org/linux/man-pages/man7/user_namespaces.7.html |
| 230 | */ |
| 231 | minijail_namespace_user_disable_setgroups(j); |
| 232 | } |
| 233 | if (0 != minijail_gidmap(j, gidmap)) { |
| 234 | fprintf(stderr, "Could not set gid map.\n"); |
| 235 | exit(1); |
| 236 | } |
| 237 | free(gidmap); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | static void use_chroot(struct minijail *j, const char *path, int *chroot, |
| 242 | int pivot_root) |
| 243 | { |
| 244 | if (pivot_root) { |
| 245 | fprintf(stderr, "Could not set chroot because " |
| 246 | "'-P' was specified.\n"); |
| 247 | exit(1); |
| 248 | } |
| 249 | if (minijail_enter_chroot(j, path)) { |
| 250 | fprintf(stderr, "Could not set chroot.\n"); |
| 251 | exit(1); |
| 252 | } |
| 253 | *chroot = 1; |
| 254 | } |
| 255 | |
| 256 | static void use_pivot_root(struct minijail *j, const char *path, |
| 257 | int *pivot_root, int chroot) |
| 258 | { |
| 259 | if (chroot) { |
| 260 | fprintf(stderr, "Could not set pivot_root because " |
| 261 | "'-C' was specified.\n"); |
| 262 | exit(1); |
| 263 | } |
| 264 | if (minijail_enter_pivot_root(j, path)) { |
| 265 | fprintf(stderr, "Could not set pivot_root.\n"); |
| 266 | exit(1); |
| 267 | } |
| 268 | minijail_namespace_vfs(j); |
| 269 | *pivot_root = 1; |
| 270 | } |
| 271 | |
| 272 | static void use_profile(struct minijail *j, const char *profile, |
| 273 | int *pivot_root, int chroot, size_t *tmp_size) |
| 274 | { |
| 275 | if (!strcmp(profile, "minimalistic-mountns")) { |
| 276 | minijail_namespace_vfs(j); |
| 277 | if (minijail_bind(j, "/", "/", 0)) { |
| 278 | fprintf(stderr, "minijail_bind failed.\n"); |
| 279 | exit(1); |
| 280 | } |
| 281 | if (minijail_bind(j, "/proc", "/proc", 0)) { |
| 282 | fprintf(stderr, "minijail_bind failed.\n"); |
| 283 | exit(1); |
| 284 | } |
| 285 | minijail_mount_dev(j); |
| 286 | if (!*tmp_size) { |
| 287 | /* Avoid clobbering |tmp_size| if it was already set. */ |
| 288 | *tmp_size = DEFAULT_TMP_SIZE; |
| 289 | } |
| 290 | minijail_remount_proc_readonly(j); |
| 291 | use_pivot_root(j, "/var/empty", pivot_root, chroot); |
| 292 | } else { |
| 293 | fprintf(stderr, "Unrecognized profile name '%s'\n", profile); |
| 294 | exit(1); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | static void usage(const char *progn) |
| 299 | { |
| 300 | size_t i; |
| 301 | /* clang-format off */ |
| 302 | printf("Usage: %s [-dGhHiIKlLnNprRstUvyYz]\n" |
| 303 | " [-a <table>]\n" |
| 304 | " [-b <src>[,<dest>[,<writeable>]]] [-k <src>,<dest>,<type>[,<flags>[,<data>]]]\n" |
| 305 | " [-c <caps>] [-C <dir>] [-P <dir>] [-e[file]] [-f <file>] [-g <group>]\n" |
| 306 | " [-m[<uid> <loweruid> <count>]*] [-M[<gid> <lowergid> <count>]*] [--profile <name>]\n" |
| 307 | " [-R <type,cur,max>] [-S <file>] [-t[size]] [-T <type>] [-u <user>] [-V <file>]\n" |
| 308 | " <program> [args...]\n" |
| 309 | " -a <table>: Use alternate syscall table <table>.\n" |
| 310 | " -b <...>: Bind <src> to <dest> in chroot.\n" |
| 311 | " Multiple instances allowed.\n" |
| 312 | " -B <mask>: Skip setting securebits in <mask> when restricting capabilities (-c).\n" |
| 313 | " By default, SECURE_NOROOT, SECURE_NO_SETUID_FIXUP, and \n" |
| 314 | " SECURE_KEEP_CAPS (together with their respective locks) are set.\n" |
| 315 | " -k <...>: Mount <src> at <dest> in chroot.\n" |
| 316 | " <flags> and <data> can be specified as in mount(2).\n" |
| 317 | " Multiple instances allowed.\n" |
| 318 | " -c <caps>: Restrict caps to <caps>.\n" |
| 319 | " -C <dir>: chroot(2) to <dir>.\n" |
| 320 | " Not compatible with -P.\n" |
| 321 | " -P <dir>: pivot_root(2) to <dir> (implies -v).\n" |
| 322 | " Not compatible with -C.\n" |
| 323 | " --mount-dev, Create a new /dev with a minimal set of device nodes (implies -v).\n" |
| 324 | " -d: See the minijail0(1) man page for the exact set.\n" |
| 325 | " -e[file]: Enter new network namespace, or existing one if |file| is provided.\n" |
| 326 | " -f <file>: Write the pid of the jailed process to <file>.\n" |
| 327 | " -g <group>: Change gid to <group>.\n" |
| 328 | " -G: Inherit supplementary groups from uid.\n" |
| 329 | " Not compatible with -y.\n" |
| 330 | " -y: Keep uid's supplementary groups.\n" |
| 331 | " Not compatible with -G.\n" |
| 332 | " -h: Help (this message).\n" |
| 333 | " -H: Seccomp filter help message.\n" |
| 334 | " -i: Exit immediately after fork (do not act as init).\n" |
| 335 | " -I: Run <program> as init (pid 1) inside a new pid namespace (implies -p).\n" |
| 336 | " -K: Don't mark all existing mounts as MS_PRIVATE.\n" |
| 337 | " -l: Enter new IPC namespace.\n" |
| 338 | " -L: Report blocked syscalls to syslog when using seccomp filter.\n" |
| 339 | " Forces the following syscalls to be allowed:\n" |
| 340 | " ", progn); |
| 341 | /* clang-format on */ |
| 342 | for (i = 0; i < log_syscalls_len; i++) |
| 343 | printf("%s ", log_syscalls[i]); |
| 344 | |
| 345 | /* clang-format off */ |
| 346 | printf("\n" |
| 347 | " -m[map]: Set the uid map of a user namespace (implies -pU).\n" |
| 348 | " Same arguments as newuidmap(1), multiple mappings should be separated by ',' (comma).\n" |
| 349 | " With no mapping, map the current uid to root inside the user namespace.\n" |
| 350 | " Not compatible with -b without the 'writable' option.\n" |
| 351 | " -M[map]: Set the gid map of a user namespace (implies -pU).\n" |
| 352 | " Same arguments as newgidmap(1), multiple mappings should be separated by ',' (comma).\n" |
| 353 | " With no mapping, map the current gid to root inside the user namespace.\n" |
| 354 | " Not compatible with -b without the 'writable' option.\n" |
| 355 | " -n: Set no_new_privs.\n" |
| 356 | " -N: Enter a new cgroup namespace.\n" |
| 357 | " -p: Enter new pid namespace (implies -vr).\n" |
| 358 | " -r: Remount /proc read-only (implies -v).\n" |
| 359 | " -R: Set rlimits, can be specified multiple times.\n" |
| 360 | " -s: Use seccomp mode 1 (not the same as -S).\n" |
| 361 | " -S <file>: Set seccomp filter using <file>.\n" |
| 362 | " E.g., '-S /usr/share/filters/<prog>.$(uname -m)'.\n" |
| 363 | " Requires -n when not running as root.\n" |
| 364 | " -t[size]: Mount tmpfs at /tmp (implies -v).\n" |
| 365 | " Optional argument specifies size (default \"64M\").\n" |
| 366 | " -T <type>: Assume <program> is a <type> ELF binary; <type> can be 'static' or 'dynamic'.\n" |
| 367 | " This will avoid accessing <program> binary before execve(2).\n" |
| 368 | " Type 'static' will avoid preload hooking.\n" |
| 369 | " -u <user>: Change uid to <user>.\n" |
| 370 | " -U: Enter new user namespace (implies -p).\n" |
| 371 | " -v: Enter new mount namespace.\n" |
| 372 | " -V <file>: Enter specified mount namespace.\n" |
| 373 | " -w: Create and join a new anonymous session keyring.\n" |
| 374 | " -Y: Synchronize seccomp filters across thread group.\n" |
| 375 | " -z: Don't forward signals to jailed process.\n" |
| 376 | " --ambient: Raise ambient capabilities. Requires -c.\n" |
| 377 | " --uts[=name]: Enter a new UTS namespace (and set hostname).\n" |
| 378 | " --logging=<s>:Use <s> as the logging system.\n" |
| 379 | " <s> must be 'syslog' (default) or 'stderr'.\n" |
| 380 | " --profile <p>,Configure minijail0 to run with the <p> sandboxing profile,\n" |
| 381 | " which is a convenient way to express multiple flags\n" |
| 382 | " that are typically used together.\n" |
| 383 | " See the minijail0(1) man page for the full list.\n"); |
| 384 | /* clang-format on */ |
| 385 | } |
| 386 | |
| 387 | static void seccomp_filter_usage(const char *progn) |
| 388 | { |
| 389 | const struct syscall_entry *entry = syscall_table; |
| 390 | printf("Usage: %s -S <policy.file> <program> [args...]\n\n" |
| 391 | "System call names supported:\n", |
| 392 | progn); |
| 393 | for (; entry->name && entry->nr >= 0; ++entry) |
| 394 | printf(" %s [%d]\n", entry->name, entry->nr); |
| 395 | printf("\nSee minijail0(5) for example policies.\n"); |
| 396 | } |
| 397 | |
| 398 | int parse_args(struct minijail *j, int argc, char * const argv[], |
| 399 | int *exit_immediately, ElfType *elftype) |
| 400 | { |
| 401 | int opt; |
| 402 | int use_seccomp_filter = 0; |
| 403 | int forward = 1; |
| 404 | int binding = 0; |
| 405 | int chroot = 0, pivot_root = 0; |
| 406 | int mount_ns = 0, skip_remount = 0; |
| 407 | int inherit_suppl_gids = 0, keep_suppl_gids = 0; |
| 408 | int caps = 0, ambient_caps = 0; |
| 409 | int seccomp = -1; |
| 410 | const size_t path_max = 4096; |
| 411 | uid_t uid = 0; |
| 412 | gid_t gid = 0; |
| 413 | char *uidmap = NULL, *gidmap = NULL; |
| 414 | int set_uidmap = 0, set_gidmap = 0; |
| 415 | size_t tmp_size = 0; |
| 416 | const char *filter_path = NULL; |
| 417 | int log_to_stderr = 0; |
| 418 | |
| 419 | const char *optstring = |
| 420 | "+u:g:sS:c:C:P:b:B:V:f:m::M::k:a:e::R:T:vrGhHinNplLt::IUKwyYzd"; |
| 421 | /* clang-format off */ |
| 422 | const struct option long_options[] = { |
| 423 | {"help", no_argument, 0, 'h'}, |
| 424 | {"mount-dev", no_argument, 0, 'd'}, |
| 425 | {"ambient", no_argument, 0, 128}, |
| 426 | {"uts", optional_argument, 0, 129}, |
| 427 | {"logging", required_argument, 0, 130}, |
| 428 | {"profile", required_argument, 0, 131}, |
| 429 | {0, 0, 0, 0}, |
| 430 | }; |
| 431 | /* clang-format on */ |
| 432 | |
| 433 | while ((opt = getopt_long(argc, argv, optstring, long_options, NULL)) != |
| 434 | -1) { |
| 435 | switch (opt) { |
| 436 | case 'u': |
| 437 | set_user(j, optarg, &uid, &gid); |
| 438 | break; |
| 439 | case 'g': |
| 440 | set_group(j, optarg, &gid); |
| 441 | break; |
| 442 | case 'n': |
| 443 | minijail_no_new_privs(j); |
| 444 | break; |
| 445 | case 's': |
| 446 | if (seccomp != -1 && seccomp != 1) { |
| 447 | fprintf(stderr, |
| 448 | "Do not use -s & -S together.\n"); |
| 449 | exit(1); |
| 450 | } |
| 451 | seccomp = 1; |
| 452 | minijail_use_seccomp(j); |
| 453 | break; |
| 454 | case 'S': |
| 455 | if (seccomp != -1 && seccomp != 2) { |
| 456 | fprintf(stderr, |
| 457 | "Do not use -s & -S together.\n"); |
| 458 | exit(1); |
| 459 | } |
| 460 | seccomp = 2; |
| 461 | minijail_use_seccomp_filter(j); |
| 462 | if (strlen(optarg) >= path_max) { |
| 463 | fprintf(stderr, "Filter path is too long.\n"); |
| 464 | exit(1); |
| 465 | } |
| 466 | filter_path = strndup(optarg, path_max); |
| 467 | if (!filter_path) { |
| 468 | fprintf(stderr, |
| 469 | "Could not strndup(3) filter path.\n"); |
| 470 | exit(1); |
| 471 | } |
| 472 | use_seccomp_filter = 1; |
| 473 | break; |
| 474 | case 'l': |
| 475 | minijail_namespace_ipc(j); |
| 476 | break; |
| 477 | case 'L': |
| 478 | minijail_log_seccomp_filter_failures(j); |
| 479 | break; |
| 480 | case 'b': |
| 481 | add_binding(j, optarg); |
| 482 | binding = 1; |
| 483 | break; |
| 484 | case 'B': |
| 485 | skip_securebits(j, optarg); |
| 486 | break; |
| 487 | case 'c': |
| 488 | caps = 1; |
| 489 | use_caps(j, optarg); |
| 490 | break; |
| 491 | case 'C': |
| 492 | use_chroot(j, optarg, &chroot, pivot_root); |
| 493 | break; |
| 494 | case 'k': |
| 495 | add_mount(j, optarg); |
| 496 | break; |
| 497 | case 'K': |
| 498 | minijail_skip_remount_private(j); |
| 499 | skip_remount = 1; |
| 500 | break; |
| 501 | case 'P': |
| 502 | use_pivot_root(j, optarg, &pivot_root, chroot); |
| 503 | break; |
| 504 | case 'f': |
| 505 | if (0 != minijail_write_pid_file(j, optarg)) { |
| 506 | fprintf(stderr, |
| 507 | "Could not prepare pid file path.\n"); |
| 508 | exit(1); |
| 509 | } |
| 510 | break; |
| 511 | case 't': |
| 512 | minijail_namespace_vfs(j); |
| 513 | if (!tmp_size) { |
| 514 | /* |
| 515 | * Avoid clobbering |tmp_size| if it was already |
| 516 | * set. |
| 517 | */ |
| 518 | tmp_size = DEFAULT_TMP_SIZE; |
| 519 | } |
| 520 | if (optarg != NULL && |
| 521 | 0 != parse_size(&tmp_size, optarg)) { |
| 522 | fprintf(stderr, "Invalid /tmp tmpfs size.\n"); |
| 523 | exit(1); |
| 524 | } |
| 525 | break; |
| 526 | case 'v': |
| 527 | minijail_namespace_vfs(j); |
| 528 | mount_ns = 1; |
| 529 | break; |
| 530 | case 'V': |
| 531 | minijail_namespace_enter_vfs(j, optarg); |
| 532 | break; |
| 533 | case 'r': |
| 534 | minijail_remount_proc_readonly(j); |
| 535 | break; |
| 536 | case 'G': |
| 537 | if (keep_suppl_gids) { |
| 538 | fprintf(stderr, |
| 539 | "-y and -G are not compatible.\n"); |
| 540 | exit(1); |
| 541 | } |
| 542 | minijail_inherit_usergroups(j); |
| 543 | inherit_suppl_gids = 1; |
| 544 | break; |
| 545 | case 'y': |
| 546 | if (inherit_suppl_gids) { |
| 547 | fprintf(stderr, |
| 548 | "-y and -G are not compatible.\n"); |
| 549 | exit(1); |
| 550 | } |
| 551 | minijail_keep_supplementary_gids(j); |
| 552 | keep_suppl_gids = 1; |
| 553 | break; |
| 554 | case 'N': |
| 555 | minijail_namespace_cgroups(j); |
| 556 | break; |
| 557 | case 'p': |
| 558 | minijail_namespace_pids(j); |
| 559 | break; |
| 560 | case 'e': |
| 561 | if (optarg) |
| 562 | minijail_namespace_enter_net(j, optarg); |
| 563 | else |
| 564 | minijail_namespace_net(j); |
| 565 | break; |
| 566 | case 'i': |
| 567 | *exit_immediately = 1; |
| 568 | break; |
| 569 | case 'H': |
| 570 | seccomp_filter_usage(argv[0]); |
| 571 | exit(0); |
| 572 | case 'I': |
| 573 | minijail_namespace_pids(j); |
| 574 | minijail_run_as_init(j); |
| 575 | break; |
| 576 | case 'U': |
| 577 | minijail_namespace_user(j); |
| 578 | minijail_namespace_pids(j); |
| 579 | break; |
| 580 | case 'm': |
| 581 | set_uidmap = 1; |
| 582 | if (uidmap) { |
| 583 | free(uidmap); |
| 584 | uidmap = NULL; |
| 585 | } |
| 586 | if (optarg) |
| 587 | uidmap = strdup(optarg); |
| 588 | break; |
| 589 | case 'M': |
| 590 | set_gidmap = 1; |
| 591 | if (gidmap) { |
| 592 | free(gidmap); |
| 593 | gidmap = NULL; |
| 594 | } |
| 595 | if (optarg) |
| 596 | gidmap = strdup(optarg); |
| 597 | break; |
| 598 | case 'a': |
| 599 | if (0 != minijail_use_alt_syscall(j, optarg)) { |
| 600 | fprintf(stderr, |
| 601 | "Could not set alt-syscall table.\n"); |
| 602 | exit(1); |
| 603 | } |
| 604 | break; |
| 605 | case 'R': |
| 606 | add_rlimit(j, optarg); |
| 607 | break; |
| 608 | case 'T': |
| 609 | if (!strcmp(optarg, "static")) |
| 610 | *elftype = ELFSTATIC; |
| 611 | else if (!strcmp(optarg, "dynamic")) |
| 612 | *elftype = ELFDYNAMIC; |
| 613 | else { |
| 614 | fprintf(stderr, "ELF type must be 'static' or " |
| 615 | "'dynamic'.\n"); |
| 616 | exit(1); |
| 617 | } |
| 618 | break; |
| 619 | case 'w': |
| 620 | minijail_new_session_keyring(j); |
| 621 | break; |
| 622 | case 'Y': |
| 623 | minijail_set_seccomp_filter_tsync(j); |
| 624 | break; |
| 625 | case 'z': |
| 626 | forward = 0; |
| 627 | break; |
| 628 | case 'd': |
| 629 | minijail_namespace_vfs(j); |
| 630 | minijail_mount_dev(j); |
| 631 | break; |
| 632 | /* Long options. */ |
| 633 | case 128: /* Ambient caps. */ |
| 634 | ambient_caps = 1; |
| 635 | minijail_set_ambient_caps(j); |
| 636 | break; |
| 637 | case 129: /* UTS/hostname namespace. */ |
| 638 | minijail_namespace_uts(j); |
| 639 | if (optarg) |
| 640 | minijail_namespace_set_hostname(j, optarg); |
| 641 | break; |
| 642 | case 130: /* Logging. */ |
| 643 | if (!strcmp(optarg, "syslog")) |
| 644 | log_to_stderr = 0; |
| 645 | else if (!strcmp(optarg, "stderr")) { |
| 646 | log_to_stderr = 1; |
| 647 | } else { |
| 648 | fprintf(stderr, "--logger must be 'syslog' or " |
| 649 | "'stderr'.\n"); |
| 650 | exit(1); |
| 651 | } |
| 652 | break; |
| 653 | case 131: /* Profile */ |
| 654 | use_profile(j, optarg, &pivot_root, chroot, &tmp_size); |
| 655 | break; |
| 656 | default: |
| 657 | usage(argv[0]); |
| 658 | exit(opt == 'h' ? 0 : 1); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | if (log_to_stderr) { |
| 663 | init_logging(LOG_TO_FD, STDERR_FILENO, LOG_INFO); |
| 664 | /* |
| 665 | * When logging to stderr, ensure the FD survives the jailing. |
| 666 | */ |
| 667 | if (0 != |
| 668 | minijail_preserve_fd(j, STDERR_FILENO, STDERR_FILENO)) { |
| 669 | fprintf(stderr, "Could not preserve stderr.\n"); |
| 670 | exit(1); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* Set up uid/gid mapping. */ |
| 675 | if (set_uidmap || set_gidmap) { |
| 676 | set_ugid_mapping(j, set_uidmap, uid, uidmap, set_gidmap, gid, |
| 677 | gidmap); |
| 678 | } |
| 679 | |
| 680 | /* Can only set ambient caps when using regular caps. */ |
| 681 | if (ambient_caps && !caps) { |
| 682 | fprintf(stderr, "Can't set ambient capabilities (--ambient) " |
| 683 | "without actually using capabilities (-c).\n"); |
| 684 | exit(1); |
| 685 | } |
| 686 | |
| 687 | /* Set up signal handlers in minijail unless asked not to. */ |
| 688 | if (forward) |
| 689 | minijail_forward_signals(j); |
| 690 | |
| 691 | /* |
| 692 | * Only allow bind mounts when entering a chroot, using pivot_root, or |
| 693 | * a new mount namespace. |
| 694 | */ |
| 695 | if (binding && !(chroot || pivot_root || mount_ns)) { |
| 696 | fprintf(stderr, "Bind mounts require a chroot, pivot_root, or " |
| 697 | " new mount namespace.\n"); |
| 698 | exit(1); |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Remounting / as MS_PRIVATE only happens when entering a new mount |
| 703 | * namespace, so skipping it only applies in that case. |
| 704 | */ |
| 705 | if (skip_remount && !mount_ns) { |
| 706 | fprintf(stderr, "Can't skip marking mounts as MS_PRIVATE" |
| 707 | " without mount namespaces.\n"); |
| 708 | exit(1); |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * We parse seccomp filters here to make sure we've collected all |
| 713 | * cmdline options. |
| 714 | */ |
| 715 | if (use_seccomp_filter) { |
| 716 | minijail_parse_seccomp_filters(j, filter_path); |
| 717 | free((void *)filter_path); |
| 718 | } |
| 719 | |
| 720 | /* Mount a tmpfs under /tmp and set its size. */ |
| 721 | if (tmp_size) |
| 722 | minijail_mount_tmp_size(j, tmp_size); |
| 723 | |
| 724 | /* |
| 725 | * There should be at least one additional unparsed argument: the |
| 726 | * executable name. |
| 727 | */ |
| 728 | if (argc == optind) { |
| 729 | usage(argv[0]); |
| 730 | exit(1); |
| 731 | } |
| 732 | |
| 733 | if (*elftype == ELFERROR) { |
| 734 | /* |
| 735 | * -T was not specified. |
| 736 | * Get the path to the program adjusted for changing root. |
| 737 | */ |
| 738 | char *program_path = |
| 739 | minijail_get_original_path(j, argv[optind]); |
| 740 | |
| 741 | /* Check that we can access the target program. */ |
| 742 | if (access(program_path, X_OK)) { |
| 743 | fprintf(stderr, |
| 744 | "Target program '%s' is not accessible.\n", |
| 745 | argv[optind]); |
| 746 | exit(1); |
| 747 | } |
| 748 | |
| 749 | /* Check if target is statically or dynamically linked. */ |
| 750 | *elftype = get_elf_linkage(program_path); |
| 751 | free(program_path); |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * Setting capabilities need either a dynamically-linked binary, or the |
| 756 | * use of ambient capabilities for them to be able to survive an |
| 757 | * execve(2). |
| 758 | */ |
| 759 | if (caps && *elftype == ELFSTATIC && !ambient_caps) { |
| 760 | fprintf(stderr, "Can't run statically-linked binaries with " |
| 761 | "capabilities (-c) without also setting " |
| 762 | "ambient capabilities. Try passing " |
| 763 | "--ambient.\n"); |
| 764 | exit(1); |
| 765 | } |
| 766 | |
| 767 | return optind; |
| 768 | } |