| 1 | /* |
| 2 | * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #include <common/compat/directory-handle.h> |
| 19 | #include <common/error.h> |
| 20 | #include <common/macros.h> |
| 21 | #include <common/runas.h> |
| 22 | #include <common/credentials.h> |
| 23 | #include <lttng/constant.h> |
| 24 | |
| 25 | #include <assert.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/stat.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | /* |
| 32 | * This compatibility layer shares a common "base" that is implemented |
| 33 | * in terms of an internal API. This file contains two implementations |
| 34 | * of the internal API below. |
| 35 | */ |
| 36 | static |
| 37 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 38 | const char *path, struct stat *st); |
| 39 | static |
| 40 | int lttng_directory_handle_mkdir( |
| 41 | const struct lttng_directory_handle *handle, |
| 42 | const char *path, mode_t mode); |
| 43 | static |
| 44 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, |
| 45 | mode_t mode, uid_t uid, gid_t gid); |
| 46 | static |
| 47 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 48 | const char *path, mode_t mode, uid_t uid, gid_t gid); |
| 49 | static |
| 50 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 51 | const char *filename, int flags, mode_t mode); |
| 52 | static |
| 53 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 54 | const char *filename, |
| 55 | int flags, mode_t mode, uid_t uid, gid_t gid); |
| 56 | static |
| 57 | int lttng_directory_handle_unlink( |
| 58 | const struct lttng_directory_handle *handle, |
| 59 | const char *filename); |
| 60 | static |
| 61 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 62 | const char *filename, uid_t uid, gid_t gid); |
| 63 | static |
| 64 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle); |
| 65 | |
| 66 | #ifdef COMPAT_DIRFD |
| 67 | |
| 68 | LTTNG_HIDDEN |
| 69 | int lttng_directory_handle_init(struct lttng_directory_handle *new_handle, |
| 70 | const char *path) |
| 71 | { |
| 72 | const struct lttng_directory_handle cwd_handle = { |
| 73 | .dirfd = AT_FDCWD, |
| 74 | }; |
| 75 | |
| 76 | /* Open a handle to the CWD if NULL is passed. */ |
| 77 | return lttng_directory_handle_init_from_handle(new_handle, |
| 78 | path, |
| 79 | &cwd_handle); |
| 80 | } |
| 81 | |
| 82 | LTTNG_HIDDEN |
| 83 | int lttng_directory_handle_init_from_handle( |
| 84 | struct lttng_directory_handle *new_handle, const char *path, |
| 85 | const struct lttng_directory_handle *handle) |
| 86 | { |
| 87 | int ret; |
| 88 | |
| 89 | if (!path) { |
| 90 | ret = lttng_directory_handle_copy(handle, new_handle); |
| 91 | goto end; |
| 92 | } |
| 93 | if (!*path) { |
| 94 | ERR("Failed to initialize directory handle: provided path is an empty string"); |
| 95 | ret = -1; |
| 96 | goto end; |
| 97 | } |
| 98 | ret = openat(handle->dirfd, path, O_RDONLY | O_DIRECTORY | O_CLOEXEC); |
| 99 | if (ret == -1) { |
| 100 | PERROR("Failed to initialize directory handle to \"%s\"", path); |
| 101 | goto end; |
| 102 | } |
| 103 | new_handle->dirfd = ret; |
| 104 | ret = 0; |
| 105 | end: |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | LTTNG_HIDDEN |
| 110 | int lttng_directory_handle_init_from_dirfd( |
| 111 | struct lttng_directory_handle *handle, int dirfd) |
| 112 | { |
| 113 | handle->dirfd = dirfd; |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | LTTNG_HIDDEN |
| 118 | void lttng_directory_handle_fini(struct lttng_directory_handle *handle) |
| 119 | { |
| 120 | int ret; |
| 121 | |
| 122 | if (handle->dirfd == AT_FDCWD || handle->dirfd == -1) { |
| 123 | goto end; |
| 124 | } |
| 125 | ret = close(handle->dirfd); |
| 126 | if (ret == -1) { |
| 127 | PERROR("Failed to close directory file descriptor of directory handle"); |
| 128 | } |
| 129 | end: |
| 130 | lttng_directory_handle_invalidate(handle); |
| 131 | } |
| 132 | |
| 133 | LTTNG_HIDDEN |
| 134 | int lttng_directory_handle_copy(const struct lttng_directory_handle *handle, |
| 135 | struct lttng_directory_handle *new_copy) |
| 136 | { |
| 137 | int ret = 0; |
| 138 | |
| 139 | if (handle->dirfd == AT_FDCWD) { |
| 140 | new_copy->dirfd = handle->dirfd; |
| 141 | } else { |
| 142 | new_copy->dirfd = dup(handle->dirfd); |
| 143 | if (new_copy->dirfd == -1) { |
| 144 | PERROR("Failed to duplicate directory fd of directory handle"); |
| 145 | ret = -1; |
| 146 | } |
| 147 | } |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | static |
| 152 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) |
| 153 | { |
| 154 | handle->dirfd = -1; |
| 155 | } |
| 156 | |
| 157 | static |
| 158 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 159 | const char *path, struct stat *st) |
| 160 | { |
| 161 | return fstatat(handle->dirfd, path, st, 0); |
| 162 | } |
| 163 | |
| 164 | static |
| 165 | int lttng_directory_handle_mkdir( |
| 166 | const struct lttng_directory_handle *handle, |
| 167 | const char *path, mode_t mode) |
| 168 | { |
| 169 | return mkdirat(handle->dirfd, path, mode); |
| 170 | } |
| 171 | |
| 172 | static |
| 173 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 174 | const char *filename, int flags, mode_t mode) |
| 175 | { |
| 176 | return openat(handle->dirfd, filename, flags, mode); |
| 177 | } |
| 178 | |
| 179 | static |
| 180 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 181 | const char *filename, |
| 182 | int flags, mode_t mode, uid_t uid, gid_t gid) |
| 183 | { |
| 184 | return run_as_openat(handle->dirfd, filename, flags, mode, uid, gid); |
| 185 | } |
| 186 | |
| 187 | static |
| 188 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 189 | const char *filename, uid_t uid, gid_t gid) |
| 190 | { |
| 191 | return run_as_unlinkat(handle->dirfd, filename, uid, gid); |
| 192 | } |
| 193 | |
| 194 | static |
| 195 | int lttng_directory_handle_unlink( |
| 196 | const struct lttng_directory_handle *handle, |
| 197 | const char *filename) |
| 198 | { |
| 199 | return unlinkat(handle->dirfd, filename, 0); |
| 200 | } |
| 201 | |
| 202 | static |
| 203 | int _run_as_mkdir(const struct lttng_directory_handle *handle, |
| 204 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 205 | { |
| 206 | return run_as_mkdirat(handle->dirfd, path, mode, uid, gid); |
| 207 | } |
| 208 | |
| 209 | static |
| 210 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 211 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 212 | { |
| 213 | return run_as_mkdirat_recursive(handle->dirfd, path, mode, uid, gid); |
| 214 | } |
| 215 | |
| 216 | #else /* COMPAT_DIRFD */ |
| 217 | |
| 218 | static |
| 219 | int get_full_path(const struct lttng_directory_handle *handle, |
| 220 | const char *subdirectory, char *fullpath, size_t size) |
| 221 | { |
| 222 | int ret; |
| 223 | |
| 224 | subdirectory = subdirectory ? : ""; |
| 225 | /* |
| 226 | * Don't include the base path if subdirectory is absolute. |
| 227 | * This is the same behaviour than mkdirat. |
| 228 | */ |
| 229 | ret = snprintf(fullpath, size, "%s%s", |
| 230 | *subdirectory != '/' ? handle->base_path : "", |
| 231 | subdirectory); |
| 232 | if (ret == -1 || ret >= size) { |
| 233 | ERR("Failed to format subdirectory from directory handle"); |
| 234 | ret = -1; |
| 235 | } |
| 236 | ret = 0; |
| 237 | return ret; |
| 238 | } |
| 239 | |
| 240 | LTTNG_HIDDEN |
| 241 | int lttng_directory_handle_init(struct lttng_directory_handle *handle, |
| 242 | const char *path) |
| 243 | { |
| 244 | int ret; |
| 245 | const char *cwd; |
| 246 | size_t cwd_len, path_len; |
| 247 | char cwd_buf[LTTNG_PATH_MAX] = {}; |
| 248 | char handle_buf[LTTNG_PATH_MAX] = {}; |
| 249 | bool add_cwd_slash, add_trailing_slash; |
| 250 | const struct lttng_directory_handle cwd_handle = { |
| 251 | .base_path = handle_buf, |
| 252 | }; |
| 253 | |
| 254 | if (path && *path == '/') { |
| 255 | /* |
| 256 | * Creation of an handle to an absolute path; no need to sample |
| 257 | * the cwd. |
| 258 | */ |
| 259 | goto create; |
| 260 | } |
| 261 | path_len = path ? strlen(path) : 0; |
| 262 | |
| 263 | cwd = getcwd(cwd_buf, sizeof(cwd_buf)); |
| 264 | if (!cwd) { |
| 265 | PERROR("Failed to initialize directory handle, can't get current working directory"); |
| 266 | ret = -1; |
| 267 | goto end; |
| 268 | } |
| 269 | cwd_len = strlen(cwd); |
| 270 | if (cwd_len == 0) { |
| 271 | ERR("Failed to initialize directory handle, current working directory path has a length of 0"); |
| 272 | ret = -1; |
| 273 | goto end; |
| 274 | } |
| 275 | |
| 276 | add_cwd_slash = cwd[cwd_len - 1] != '/'; |
| 277 | add_trailing_slash = path && path[path_len - 1] != '/'; |
| 278 | |
| 279 | ret = snprintf(handle_buf, sizeof(handle_buf), "%s%s%s%s", |
| 280 | cwd, |
| 281 | add_cwd_slash ? "/" : "", |
| 282 | path ? : "", |
| 283 | add_trailing_slash ? "/" : ""); |
| 284 | if (ret == -1 || ret >= LTTNG_PATH_MAX) { |
| 285 | ERR("Failed to initialize directory handle, failed to format directory path"); |
| 286 | goto end; |
| 287 | } |
| 288 | create: |
| 289 | ret = lttng_directory_handle_init_from_handle(handle, path, |
| 290 | &cwd_handle); |
| 291 | end: |
| 292 | return ret; |
| 293 | } |
| 294 | |
| 295 | LTTNG_HIDDEN |
| 296 | int lttng_directory_handle_init_from_handle( |
| 297 | struct lttng_directory_handle *new_handle, const char *path, |
| 298 | const struct lttng_directory_handle *handle) |
| 299 | { |
| 300 | int ret; |
| 301 | size_t path_len, handle_path_len; |
| 302 | bool add_trailing_slash; |
| 303 | struct stat stat_buf; |
| 304 | |
| 305 | assert(handle && handle->base_path); |
| 306 | |
| 307 | ret = lttng_directory_handle_stat(handle, path, &stat_buf); |
| 308 | if (ret == -1) { |
| 309 | PERROR("Failed to create directory handle"); |
| 310 | goto end; |
| 311 | } else if (!S_ISDIR(stat_buf.st_mode)) { |
| 312 | char full_path[LTTNG_PATH_MAX]; |
| 313 | |
| 314 | /* Best effort for logging purposes. */ |
| 315 | ret = get_full_path(handle, path, full_path, |
| 316 | sizeof(full_path)); |
| 317 | if (ret) { |
| 318 | full_path[0] = '\0'; |
| 319 | } |
| 320 | |
| 321 | ERR("Failed to initialize directory handle to \"%s\": not a directory", |
| 322 | full_path); |
| 323 | ret = -1; |
| 324 | goto end; |
| 325 | } |
| 326 | if (!path) { |
| 327 | ret = lttng_directory_handle_copy(handle, new_handle); |
| 328 | goto end; |
| 329 | } |
| 330 | |
| 331 | path_len = strlen(path); |
| 332 | if (path_len == 0) { |
| 333 | ERR("Failed to initialize directory handle: provided path is an empty string"); |
| 334 | ret = -1; |
| 335 | goto end; |
| 336 | } |
| 337 | if (*path == '/') { |
| 338 | new_handle->base_path = strdup(path); |
| 339 | ret = new_handle->base_path ? 0 : -1; |
| 340 | goto end; |
| 341 | } |
| 342 | |
| 343 | add_trailing_slash = path[path_len - 1] != '/'; |
| 344 | |
| 345 | handle_path_len = strlen(handle->base_path) + path_len + |
| 346 | !!add_trailing_slash; |
| 347 | if (handle_path_len >= LTTNG_PATH_MAX) { |
| 348 | ERR("Failed to initialize directory handle as the resulting path's length (%zu bytes) exceeds the maximal allowed length (%d bytes)", |
| 349 | handle_path_len, LTTNG_PATH_MAX); |
| 350 | ret = -1; |
| 351 | goto end; |
| 352 | } |
| 353 | new_handle->base_path = zmalloc(handle_path_len); |
| 354 | if (!new_handle->base_path) { |
| 355 | PERROR("Failed to initialize directory handle"); |
| 356 | ret = -1; |
| 357 | goto end; |
| 358 | } |
| 359 | |
| 360 | ret = sprintf(new_handle->base_path, "%s%s%s", |
| 361 | handle->base_path, |
| 362 | path, |
| 363 | add_trailing_slash ? "/" : ""); |
| 364 | if (ret == -1 || ret >= handle_path_len) { |
| 365 | ERR("Failed to initialize directory handle: path formatting failed"); |
| 366 | ret = -1; |
| 367 | goto end; |
| 368 | } |
| 369 | end: |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | LTTNG_HIDDEN |
| 374 | int lttng_directory_handle_init_from_dirfd( |
| 375 | struct lttng_directory_handle *handle, int dirfd) |
| 376 | { |
| 377 | assert(dirfd == AT_FDCWD); |
| 378 | return lttng_directory_handle_init(handle, NULL); |
| 379 | } |
| 380 | |
| 381 | LTTNG_HIDDEN |
| 382 | void lttng_directory_handle_fini(struct lttng_directory_handle *handle) |
| 383 | { |
| 384 | free(handle->base_path); |
| 385 | lttng_directory_handle_invalidate(handle); |
| 386 | } |
| 387 | |
| 388 | LTTNG_HIDDEN |
| 389 | int lttng_directory_handle_copy(const struct lttng_directory_handle *handle, |
| 390 | struct lttng_directory_handle *new_copy) |
| 391 | { |
| 392 | new_copy->base_path = strdup(handle->base_path); |
| 393 | return new_copy->base_path ? 0 : -1; |
| 394 | } |
| 395 | |
| 396 | static |
| 397 | void lttng_directory_handle_invalidate(struct lttng_directory_handle *handle) |
| 398 | { |
| 399 | handle->base_path = NULL; |
| 400 | } |
| 401 | |
| 402 | static |
| 403 | int lttng_directory_handle_stat(const struct lttng_directory_handle *handle, |
| 404 | const char *subdirectory, struct stat *st) |
| 405 | { |
| 406 | int ret; |
| 407 | char fullpath[LTTNG_PATH_MAX]; |
| 408 | |
| 409 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); |
| 410 | if (ret) { |
| 411 | errno = ENOMEM; |
| 412 | goto end; |
| 413 | } |
| 414 | |
| 415 | ret = stat(fullpath, st); |
| 416 | end: |
| 417 | return ret; |
| 418 | } |
| 419 | |
| 420 | static |
| 421 | int lttng_directory_handle_mkdir(const struct lttng_directory_handle *handle, |
| 422 | const char *subdirectory, mode_t mode) |
| 423 | { |
| 424 | int ret; |
| 425 | char fullpath[LTTNG_PATH_MAX]; |
| 426 | |
| 427 | ret = get_full_path(handle, subdirectory, fullpath, sizeof(fullpath)); |
| 428 | if (ret) { |
| 429 | errno = ENOMEM; |
| 430 | goto end; |
| 431 | } |
| 432 | |
| 433 | ret = mkdir(fullpath, mode); |
| 434 | end: |
| 435 | return ret; |
| 436 | } |
| 437 | |
| 438 | static |
| 439 | int lttng_directory_handle_open(const struct lttng_directory_handle *handle, |
| 440 | const char *filename, int flags, mode_t mode) |
| 441 | { |
| 442 | int ret; |
| 443 | char fullpath[LTTNG_PATH_MAX]; |
| 444 | |
| 445 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 446 | if (ret) { |
| 447 | errno = ENOMEM; |
| 448 | goto end; |
| 449 | } |
| 450 | |
| 451 | ret = open(fullpath, flags, mode); |
| 452 | end: |
| 453 | return ret; |
| 454 | } |
| 455 | |
| 456 | static |
| 457 | int lttng_directory_handle_unlink( |
| 458 | const struct lttng_directory_handle *handle, |
| 459 | const char *filename) |
| 460 | { |
| 461 | int ret; |
| 462 | char fullpath[LTTNG_PATH_MAX]; |
| 463 | |
| 464 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 465 | if (ret) { |
| 466 | errno = ENOMEM; |
| 467 | goto end; |
| 468 | } |
| 469 | |
| 470 | ret = unlink(fullpath); |
| 471 | end: |
| 472 | return ret; |
| 473 | } |
| 474 | |
| 475 | static |
| 476 | int _run_as_mkdir(const struct lttng_directory_handle *handle, const char *path, |
| 477 | mode_t mode, uid_t uid, gid_t gid) |
| 478 | { |
| 479 | int ret; |
| 480 | char fullpath[LTTNG_PATH_MAX]; |
| 481 | |
| 482 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); |
| 483 | if (ret) { |
| 484 | errno = ENOMEM; |
| 485 | goto end; |
| 486 | } |
| 487 | |
| 488 | ret = run_as_mkdir(fullpath, mode, uid, gid); |
| 489 | end: |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | static |
| 494 | int _run_as_open(const struct lttng_directory_handle *handle, |
| 495 | const char *filename, |
| 496 | int flags, mode_t mode, uid_t uid, gid_t gid) |
| 497 | { |
| 498 | int ret; |
| 499 | char fullpath[LTTNG_PATH_MAX]; |
| 500 | |
| 501 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 502 | if (ret) { |
| 503 | errno = ENOMEM; |
| 504 | goto end; |
| 505 | } |
| 506 | |
| 507 | ret = run_as_open(fullpath, flags, mode, uid, gid); |
| 508 | end: |
| 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | static |
| 513 | int _run_as_unlink(const struct lttng_directory_handle *handle, |
| 514 | const char *filename, uid_t uid, gid_t gid) |
| 515 | { |
| 516 | int ret; |
| 517 | char fullpath[LTTNG_PATH_MAX]; |
| 518 | |
| 519 | ret = get_full_path(handle, filename, fullpath, sizeof(fullpath)); |
| 520 | if (ret) { |
| 521 | errno = ENOMEM; |
| 522 | goto end; |
| 523 | } |
| 524 | |
| 525 | ret = run_as_unlink(fullpath, uid, gid); |
| 526 | end: |
| 527 | return ret; |
| 528 | } |
| 529 | |
| 530 | static |
| 531 | int _run_as_mkdir_recursive(const struct lttng_directory_handle *handle, |
| 532 | const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 533 | { |
| 534 | int ret; |
| 535 | char fullpath[LTTNG_PATH_MAX]; |
| 536 | |
| 537 | ret = get_full_path(handle, path, fullpath, sizeof(fullpath)); |
| 538 | if (ret) { |
| 539 | errno = ENOMEM; |
| 540 | goto end; |
| 541 | } |
| 542 | |
| 543 | ret = run_as_mkdir_recursive(fullpath, mode, uid, gid); |
| 544 | end: |
| 545 | return ret; |
| 546 | } |
| 547 | |
| 548 | #endif /* COMPAT_DIRFD */ |
| 549 | |
| 550 | /* |
| 551 | * On some filesystems (e.g. nfs), mkdir will validate access rights before |
| 552 | * checking for the existence of the path element. This means that on a setup |
| 553 | * where "/home/" is a mounted NFS share, and running as an unpriviledged user, |
| 554 | * recursively creating a path of the form "/home/my_user/trace/" will fail with |
| 555 | * EACCES on mkdir("/home", ...). |
| 556 | * |
| 557 | * Checking the path for existence allows us to work around this behaviour. |
| 558 | */ |
| 559 | static |
| 560 | int create_directory_check_exists(const struct lttng_directory_handle *handle, |
| 561 | const char *path, mode_t mode) |
| 562 | { |
| 563 | int ret = 0; |
| 564 | struct stat st; |
| 565 | |
| 566 | ret = lttng_directory_handle_stat(handle, path, &st); |
| 567 | if (ret == 0) { |
| 568 | if (S_ISDIR(st.st_mode)) { |
| 569 | /* Directory exists, skip. */ |
| 570 | goto end; |
| 571 | } else { |
| 572 | /* Exists, but is not a directory. */ |
| 573 | errno = ENOTDIR; |
| 574 | ret = -1; |
| 575 | goto end; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Let mkdir handle other errors as the caller expects mkdir |
| 581 | * semantics. |
| 582 | */ |
| 583 | ret = lttng_directory_handle_mkdir(handle, path, mode); |
| 584 | end: |
| 585 | return ret; |
| 586 | } |
| 587 | |
| 588 | /* Common implementation. */ |
| 589 | LTTNG_HIDDEN |
| 590 | struct lttng_directory_handle |
| 591 | lttng_directory_handle_move(struct lttng_directory_handle *original) |
| 592 | { |
| 593 | const struct lttng_directory_handle tmp = *original; |
| 594 | |
| 595 | lttng_directory_handle_invalidate(original); |
| 596 | return tmp; |
| 597 | } |
| 598 | |
| 599 | static |
| 600 | int create_directory_recursive(const struct lttng_directory_handle *handle, |
| 601 | const char *path, mode_t mode) |
| 602 | { |
| 603 | char *p, tmp[LTTNG_PATH_MAX]; |
| 604 | size_t len; |
| 605 | int ret; |
| 606 | |
| 607 | assert(path); |
| 608 | |
| 609 | ret = lttng_strncpy(tmp, path, sizeof(tmp)); |
| 610 | if (ret) { |
| 611 | ERR("Failed to create directory: provided path's length (%zu bytes) exceeds the maximal allowed length (%zu bytes)", |
| 612 | strlen(path) + 1, sizeof(tmp)); |
| 613 | goto error; |
| 614 | } |
| 615 | |
| 616 | len = strlen(path); |
| 617 | if (tmp[len - 1] == '/') { |
| 618 | tmp[len - 1] = 0; |
| 619 | } |
| 620 | |
| 621 | for (p = tmp + 1; *p; p++) { |
| 622 | if (*p == '/') { |
| 623 | *p = 0; |
| 624 | if (tmp[strlen(tmp) - 1] == '.' && |
| 625 | tmp[strlen(tmp) - 2] == '.' && |
| 626 | tmp[strlen(tmp) - 3] == '/') { |
| 627 | ERR("Using '/../' is not permitted in the trace path (%s)", |
| 628 | tmp); |
| 629 | ret = -1; |
| 630 | goto error; |
| 631 | } |
| 632 | ret = create_directory_check_exists(handle, tmp, mode); |
| 633 | if (ret < 0) { |
| 634 | if (errno != EACCES) { |
| 635 | PERROR("Failed to create directory \"%s\"", |
| 636 | path); |
| 637 | ret = -errno; |
| 638 | goto error; |
| 639 | } |
| 640 | } |
| 641 | *p = '/'; |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | ret = create_directory_check_exists(handle, tmp, mode); |
| 646 | if (ret < 0) { |
| 647 | PERROR("mkdirat recursive last element"); |
| 648 | ret = -errno; |
| 649 | } |
| 650 | error: |
| 651 | return ret; |
| 652 | } |
| 653 | |
| 654 | LTTNG_HIDDEN |
| 655 | int lttng_directory_handle_create_subdirectory_as_user( |
| 656 | const struct lttng_directory_handle *handle, |
| 657 | const char *subdirectory, |
| 658 | mode_t mode, const struct lttng_credentials *creds) |
| 659 | { |
| 660 | int ret; |
| 661 | |
| 662 | if (!creds) { |
| 663 | /* Run as current user. */ |
| 664 | ret = create_directory_check_exists(handle, |
| 665 | subdirectory, mode); |
| 666 | } else { |
| 667 | ret = _run_as_mkdir(handle, subdirectory, |
| 668 | mode, creds->uid, creds->gid); |
| 669 | } |
| 670 | |
| 671 | return ret; |
| 672 | } |
| 673 | |
| 674 | LTTNG_HIDDEN |
| 675 | int lttng_directory_handle_create_subdirectory_recursive_as_user( |
| 676 | const struct lttng_directory_handle *handle, |
| 677 | const char *subdirectory_path, |
| 678 | mode_t mode, const struct lttng_credentials *creds) |
| 679 | { |
| 680 | int ret; |
| 681 | |
| 682 | if (!creds) { |
| 683 | /* Run as current user. */ |
| 684 | ret = create_directory_recursive(handle, |
| 685 | subdirectory_path, mode); |
| 686 | } else { |
| 687 | ret = _run_as_mkdir_recursive(handle, subdirectory_path, |
| 688 | mode, creds->uid, creds->gid); |
| 689 | } |
| 690 | |
| 691 | return ret; |
| 692 | } |
| 693 | |
| 694 | LTTNG_HIDDEN |
| 695 | int lttng_directory_handle_create_subdirectory( |
| 696 | const struct lttng_directory_handle *handle, |
| 697 | const char *subdirectory, |
| 698 | mode_t mode) |
| 699 | { |
| 700 | return lttng_directory_handle_create_subdirectory_as_user( |
| 701 | handle, subdirectory, mode, NULL); |
| 702 | } |
| 703 | |
| 704 | LTTNG_HIDDEN |
| 705 | int lttng_directory_handle_create_subdirectory_recursive( |
| 706 | const struct lttng_directory_handle *handle, |
| 707 | const char *subdirectory_path, |
| 708 | mode_t mode) |
| 709 | { |
| 710 | return lttng_directory_handle_create_subdirectory_recursive_as_user( |
| 711 | handle, subdirectory_path, mode, NULL); |
| 712 | } |
| 713 | |
| 714 | LTTNG_HIDDEN |
| 715 | int lttng_directory_handle_open_file_as_user( |
| 716 | const struct lttng_directory_handle *handle, |
| 717 | const char *filename, |
| 718 | int flags, mode_t mode, |
| 719 | const struct lttng_credentials *creds) |
| 720 | { |
| 721 | int ret; |
| 722 | |
| 723 | if (!creds) { |
| 724 | /* Run as current user. */ |
| 725 | ret = lttng_directory_handle_open(handle, filename, flags, |
| 726 | mode); |
| 727 | } else { |
| 728 | ret = _run_as_open(handle, filename, flags, mode, |
| 729 | creds->uid, creds->gid); |
| 730 | } |
| 731 | return ret; |
| 732 | } |
| 733 | |
| 734 | LTTNG_HIDDEN |
| 735 | int lttng_directory_handle_open_file( |
| 736 | const struct lttng_directory_handle *handle, |
| 737 | const char *filename, |
| 738 | int flags, mode_t mode) |
| 739 | { |
| 740 | return lttng_directory_handle_open_file_as_user(handle, filename, flags, |
| 741 | mode, NULL); |
| 742 | } |
| 743 | |
| 744 | LTTNG_HIDDEN |
| 745 | int lttng_directory_handle_unlink_file_as_user( |
| 746 | const struct lttng_directory_handle *handle, |
| 747 | const char *filename, |
| 748 | const struct lttng_credentials *creds) |
| 749 | { |
| 750 | int ret; |
| 751 | |
| 752 | if (!creds) { |
| 753 | /* Run as current user. */ |
| 754 | ret = lttng_directory_handle_unlink(handle, filename); |
| 755 | } else { |
| 756 | ret = _run_as_unlink(handle, filename, creds->uid, creds->gid); |
| 757 | } |
| 758 | return ret; |
| 759 | } |
| 760 | |
| 761 | LTTNG_HIDDEN |
| 762 | int lttng_directory_handle_unlink_file( |
| 763 | const struct lttng_directory_handle *handle, |
| 764 | const char *filename) |
| 765 | { |
| 766 | return lttng_directory_handle_unlink_file_as_user(handle, |
| 767 | filename, NULL); |
| 768 | } |