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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 | // SPDX-License-Identifier: GPL-2.0 /* * Landlock tests - Common user space base * * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net> * Copyright © 2019-2020 ANSSI */ #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <linux/keyctl.h> #include <linux/landlock.h> #include <string.h> #include <sys/prctl.h> #include <sys/socket.h> #include <sys/types.h> #include "common.h" #ifndef O_PATH #define O_PATH 010000000 #endif TEST(inconsistent_attr) { const long page_size = sysconf(_SC_PAGESIZE); char *const buf = malloc(page_size + 1); struct landlock_ruleset_attr *const ruleset_attr = (void *)buf; ASSERT_NE(NULL, buf); /* Checks copy_from_user(). */ ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 0, 0)); /* The size if less than sizeof(struct landlock_attr_enforce). */ ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 1, 0)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 7, 0)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(NULL, 1, 0)); /* The size if less than sizeof(struct landlock_attr_enforce). */ ASSERT_EQ(EFAULT, errno); ASSERT_EQ(-1, landlock_create_ruleset( NULL, sizeof(struct landlock_ruleset_attr), 0)); ASSERT_EQ(EFAULT, errno); ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, page_size + 1, 0)); ASSERT_EQ(E2BIG, errno); /* Checks minimal valid attribute size. */ ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 8, 0)); ASSERT_EQ(ENOMSG, errno); ASSERT_EQ(-1, landlock_create_ruleset( ruleset_attr, sizeof(struct landlock_ruleset_attr), 0)); ASSERT_EQ(ENOMSG, errno); ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, page_size, 0)); ASSERT_EQ(ENOMSG, errno); /* Checks non-zero value. */ buf[page_size - 2] = '.'; ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, page_size, 0)); ASSERT_EQ(E2BIG, errno); ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, page_size + 1, 0)); ASSERT_EQ(E2BIG, errno); free(buf); } TEST(abi_version) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE, }; ASSERT_EQ(5, landlock_create_ruleset(NULL, 0, LANDLOCK_CREATE_RULESET_VERSION)); ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 0, LANDLOCK_CREATE_RULESET_VERSION)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(NULL, sizeof(ruleset_attr), LANDLOCK_CREATE_RULESET_VERSION)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), LANDLOCK_CREATE_RULESET_VERSION)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(NULL, 0, LANDLOCK_CREATE_RULESET_VERSION | 1 << 31)); ASSERT_EQ(EINVAL, errno); } /* Tests ordering of syscall argument checks. */ TEST(create_ruleset_checks_ordering) { const int last_flag = LANDLOCK_CREATE_RULESET_VERSION; const int invalid_flag = last_flag << 1; int ruleset_fd; const struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE, }; /* Checks priority for invalid flags. */ ASSERT_EQ(-1, landlock_create_ruleset(NULL, 0, invalid_flag)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 0, invalid_flag)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(NULL, sizeof(ruleset_attr), invalid_flag)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), invalid_flag)); ASSERT_EQ(EINVAL, errno); /* Checks too big ruleset_attr size. */ ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, -1, 0)); ASSERT_EQ(E2BIG, errno); /* Checks too small ruleset_attr size. */ ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 0, 0)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 1, 0)); ASSERT_EQ(EINVAL, errno); /* Checks valid call. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, close(ruleset_fd)); } /* Tests ordering of syscall argument checks. */ TEST(add_rule_checks_ordering) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE, }; struct landlock_path_beneath_attr path_beneath_attr = { .allowed_access = LANDLOCK_ACCESS_FS_EXECUTE, .parent_fd = -1, }; const int ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Checks invalid flags. */ ASSERT_EQ(-1, landlock_add_rule(-1, 0, NULL, 1)); ASSERT_EQ(EINVAL, errno); /* Checks invalid ruleset FD. */ ASSERT_EQ(-1, landlock_add_rule(-1, 0, NULL, 0)); ASSERT_EQ(EBADF, errno); /* Checks invalid rule type. */ ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, 0, NULL, 0)); ASSERT_EQ(EINVAL, errno); /* Checks invalid rule attr. */ ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, NULL, 0)); ASSERT_EQ(EFAULT, errno); /* Checks invalid path_beneath.parent_fd. */ ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_attr, 0)); ASSERT_EQ(EBADF, errno); /* Checks valid call. */ path_beneath_attr.parent_fd = open("/tmp", O_PATH | O_NOFOLLOW | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath_attr.parent_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_attr, 0)); ASSERT_EQ(0, close(path_beneath_attr.parent_fd)); ASSERT_EQ(0, close(ruleset_fd)); } /* Tests ordering of syscall argument and permission checks. */ TEST(restrict_self_checks_ordering) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE, }; struct landlock_path_beneath_attr path_beneath_attr = { .allowed_access = LANDLOCK_ACCESS_FS_EXECUTE, .parent_fd = -1, }; const int ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); path_beneath_attr.parent_fd = open("/tmp", O_PATH | O_NOFOLLOW | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath_attr.parent_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_attr, 0)); ASSERT_EQ(0, close(path_beneath_attr.parent_fd)); /* Checks unprivileged enforcement without no_new_privs. */ drop_caps(_metadata); ASSERT_EQ(-1, landlock_restrict_self(-1, -1)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, landlock_restrict_self(-1, 0)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(-1, landlock_restrict_self(ruleset_fd, 0)); ASSERT_EQ(EPERM, errno); ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); /* Checks invalid flags. */ ASSERT_EQ(-1, landlock_restrict_self(-1, -1)); ASSERT_EQ(EINVAL, errno); /* Checks invalid ruleset FD. */ ASSERT_EQ(-1, landlock_restrict_self(-1, 0)); ASSERT_EQ(EBADF, errno); /* Checks valid call. */ ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)); ASSERT_EQ(0, close(ruleset_fd)); } TEST(ruleset_fd_io) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE, }; int ruleset_fd; char buf; drop_caps(_metadata); ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(-1, write(ruleset_fd, ".", 1)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(-1, read(ruleset_fd, &buf, 1)); ASSERT_EQ(EINVAL, errno); ASSERT_EQ(0, close(ruleset_fd)); } /* Tests enforcement of a ruleset FD transferred through a UNIX socket. */ TEST(ruleset_fd_transfer) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR, }; struct landlock_path_beneath_attr path_beneath_attr = { .allowed_access = LANDLOCK_ACCESS_FS_READ_DIR, }; int ruleset_fd_tx, dir_fd; int socket_fds[2]; pid_t child; int status; drop_caps(_metadata); /* Creates a test ruleset with a simple rule. */ ruleset_fd_tx = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd_tx); path_beneath_attr.parent_fd = open("/tmp", O_PATH | O_NOFOLLOW | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath_attr.parent_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd_tx, LANDLOCK_RULE_PATH_BENEATH, &path_beneath_attr, 0)); ASSERT_EQ(0, close(path_beneath_attr.parent_fd)); /* Sends the ruleset FD over a socketpair and then close it. */ ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, socket_fds)); ASSERT_EQ(0, send_fd(socket_fds[0], ruleset_fd_tx)); ASSERT_EQ(0, close(socket_fds[0])); ASSERT_EQ(0, close(ruleset_fd_tx)); child = fork(); ASSERT_LE(0, child); if (child == 0) { const int ruleset_fd_rx = recv_fd(socket_fds[1]); ASSERT_LE(0, ruleset_fd_rx); ASSERT_EQ(0, close(socket_fds[1])); /* Enforces the received ruleset on the child. */ ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); ASSERT_EQ(0, landlock_restrict_self(ruleset_fd_rx, 0)); ASSERT_EQ(0, close(ruleset_fd_rx)); /* Checks that the ruleset enforcement. */ ASSERT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC)); ASSERT_EQ(EACCES, errno); dir_fd = open("/tmp", O_RDONLY | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, dir_fd); ASSERT_EQ(0, close(dir_fd)); _exit(_metadata->exit_code); return; } ASSERT_EQ(0, close(socket_fds[1])); /* Checks that the parent is unrestricted. */ dir_fd = open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, dir_fd); ASSERT_EQ(0, close(dir_fd)); dir_fd = open("/tmp", O_RDONLY | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, dir_fd); ASSERT_EQ(0, close(dir_fd)); ASSERT_EQ(child, waitpid(child, &status, 0)); ASSERT_EQ(1, WIFEXITED(status)); ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); } TEST(cred_transfer) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR, }; int ruleset_fd, dir_fd; pid_t child; int status; drop_caps(_metadata); dir_fd = open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC); EXPECT_LE(0, dir_fd); EXPECT_EQ(0, close(dir_fd)); /* Denies opening directories. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)); EXPECT_EQ(0, close(ruleset_fd)); /* Checks ruleset enforcement. */ EXPECT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC)); EXPECT_EQ(EACCES, errno); /* Needed for KEYCTL_SESSION_TO_PARENT permission checks */ EXPECT_NE(-1, syscall(__NR_keyctl, KEYCTL_JOIN_SESSION_KEYRING, NULL, 0, 0, 0)) { TH_LOG("Failed to join session keyring: %s", strerror(errno)); } child = fork(); ASSERT_LE(0, child); if (child == 0) { /* Checks ruleset enforcement. */ EXPECT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC)); EXPECT_EQ(EACCES, errno); /* * KEYCTL_SESSION_TO_PARENT is a no-op unless we have a * different session keyring in the child, so make that happen. */ EXPECT_NE(-1, syscall(__NR_keyctl, KEYCTL_JOIN_SESSION_KEYRING, NULL, 0, 0, 0)); /* * KEYCTL_SESSION_TO_PARENT installs credentials on the parent * that never go through the cred_prepare hook, this path uses * cred_transfer instead. */ EXPECT_EQ(0, syscall(__NR_keyctl, KEYCTL_SESSION_TO_PARENT, 0, 0, 0, 0)); /* Re-checks ruleset enforcement. */ EXPECT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC)); EXPECT_EQ(EACCES, errno); _exit(_metadata->exit_code); return; } EXPECT_EQ(child, waitpid(child, &status, 0)); EXPECT_EQ(1, WIFEXITED(status)); EXPECT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); /* Re-checks ruleset enforcement. */ EXPECT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC)); EXPECT_EQ(EACCES, errno); } TEST_HARNESS_MAIN |