| 1 | /* copy-acl.c - copy access control list from one file to another file |
| 2 | |
| 3 | Copyright (C) 2002-2003, 2005-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */ |
| 19 | |
| 20 | #include <config.h> |
| 21 | |
| 22 | #include "acl.h" |
| 23 | |
| 24 | #include "acl-internal.h" |
| 25 | |
| 26 | |
| 27 | /* Copy access control lists from one file to another. If SOURCE_DESC is |
| 28 | a valid file descriptor, use file descriptor operations, else use |
| 29 | filename based operations on SRC_NAME. Likewise for DEST_DESC and |
| 30 | DST_NAME. |
| 31 | If access control lists are not available, fchmod the target file to |
| 32 | MODE. Also sets the non-permission bits of the destination file |
| 33 | (S_ISUID, S_ISGID, S_ISVTX) to those from MODE if any are set. |
| 34 | Return 0 if successful. |
| 35 | Return -2 and set errno for an error relating to the source file. |
| 36 | Return -1 and set errno for an error relating to the destination file. */ |
| 37 | |
| 38 | int |
| 39 | qcopy_acl (const char *src_name, int source_desc, const char *dst_name, |
| 40 | int dest_desc, mode_t mode) |
| 41 | { |
| 42 | #if USE_ACL && HAVE_ACL_GET_FILE |
| 43 | /* POSIX 1003.1e (draft 17 -- abandoned) specific version. */ |
| 44 | /* Linux, FreeBSD, Mac OS X, IRIX, Tru64 */ |
| 45 | # if !HAVE_ACL_TYPE_EXTENDED |
| 46 | /* Linux, FreeBSD, IRIX, Tru64 */ |
| 47 | |
| 48 | acl_t acl; |
| 49 | int ret; |
| 50 | |
| 51 | if (HAVE_ACL_GET_FD && source_desc != -1) |
| 52 | acl = acl_get_fd (source_desc); |
| 53 | else |
| 54 | acl = acl_get_file (src_name, ACL_TYPE_ACCESS); |
| 55 | if (acl == NULL) |
| 56 | { |
| 57 | if (! acl_errno_valid (errno)) |
| 58 | return qset_acl (dst_name, dest_desc, mode); |
| 59 | else |
| 60 | return -2; |
| 61 | } |
| 62 | |
| 63 | if (HAVE_ACL_SET_FD && dest_desc != -1) |
| 64 | ret = acl_set_fd (dest_desc, acl); |
| 65 | else |
| 66 | ret = acl_set_file (dst_name, ACL_TYPE_ACCESS, acl); |
| 67 | if (ret != 0) |
| 68 | { |
| 69 | int saved_errno = errno; |
| 70 | |
| 71 | if (! acl_errno_valid (errno) && !acl_access_nontrivial (acl)) |
| 72 | { |
| 73 | acl_free (acl); |
| 74 | return chmod_or_fchmod (dst_name, dest_desc, mode); |
| 75 | } |
| 76 | else |
| 77 | { |
| 78 | acl_free (acl); |
| 79 | chmod_or_fchmod (dst_name, dest_desc, mode); |
| 80 | errno = saved_errno; |
| 81 | return -1; |
| 82 | } |
| 83 | } |
| 84 | else |
| 85 | acl_free (acl); |
| 86 | |
| 87 | if (!MODE_INSIDE_ACL || (mode & (S_ISUID | S_ISGID | S_ISVTX))) |
| 88 | { |
| 89 | /* We did not call chmod so far, and either the mode and the ACL are |
| 90 | separate or special bits are to be set which don't fit into ACLs. */ |
| 91 | |
| 92 | if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0) |
| 93 | return -1; |
| 94 | } |
| 95 | |
| 96 | if (S_ISDIR (mode)) |
| 97 | { |
| 98 | acl = acl_get_file (src_name, ACL_TYPE_DEFAULT); |
| 99 | if (acl == NULL) |
| 100 | return -2; |
| 101 | |
| 102 | if (acl_set_file (dst_name, ACL_TYPE_DEFAULT, acl)) |
| 103 | { |
| 104 | int saved_errno = errno; |
| 105 | |
| 106 | acl_free (acl); |
| 107 | errno = saved_errno; |
| 108 | return -1; |
| 109 | } |
| 110 | else |
| 111 | acl_free (acl); |
| 112 | } |
| 113 | return 0; |
| 114 | |
| 115 | # else /* HAVE_ACL_TYPE_EXTENDED */ |
| 116 | /* Mac OS X */ |
| 117 | |
| 118 | /* On Mac OS X, acl_get_file (name, ACL_TYPE_ACCESS) |
| 119 | and acl_get_file (name, ACL_TYPE_DEFAULT) |
| 120 | always return NULL / EINVAL. You have to use |
| 121 | acl_get_file (name, ACL_TYPE_EXTENDED) |
| 122 | or acl_get_fd (open (name, ...)) |
| 123 | to retrieve an ACL. |
| 124 | On the other hand, |
| 125 | acl_set_file (name, ACL_TYPE_ACCESS, acl) |
| 126 | and acl_set_file (name, ACL_TYPE_DEFAULT, acl) |
| 127 | have the same effect as |
| 128 | acl_set_file (name, ACL_TYPE_EXTENDED, acl): |
| 129 | Each of these calls sets the file's ACL. */ |
| 130 | |
| 131 | acl_t acl; |
| 132 | int ret; |
| 133 | |
| 134 | if (HAVE_ACL_GET_FD && source_desc != -1) |
| 135 | acl = acl_get_fd (source_desc); |
| 136 | else |
| 137 | acl = acl_get_file (src_name, ACL_TYPE_EXTENDED); |
| 138 | if (acl == NULL) |
| 139 | { |
| 140 | if (!acl_errno_valid (errno)) |
| 141 | return qset_acl (dst_name, dest_desc, mode); |
| 142 | else |
| 143 | return -2; |
| 144 | } |
| 145 | |
| 146 | if (HAVE_ACL_SET_FD && dest_desc != -1) |
| 147 | ret = acl_set_fd (dest_desc, acl); |
| 148 | else |
| 149 | ret = acl_set_file (dst_name, ACL_TYPE_EXTENDED, acl); |
| 150 | if (ret != 0) |
| 151 | { |
| 152 | int saved_errno = errno; |
| 153 | |
| 154 | if (!acl_errno_valid (saved_errno) && !acl_extended_nontrivial (acl)) |
| 155 | { |
| 156 | acl_free (acl); |
| 157 | return chmod_or_fchmod (dst_name, dest_desc, mode); |
| 158 | } |
| 159 | else |
| 160 | { |
| 161 | acl_free (acl); |
| 162 | chmod_or_fchmod (dst_name, dest_desc, mode); |
| 163 | errno = saved_errno; |
| 164 | return -1; |
| 165 | } |
| 166 | } |
| 167 | else |
| 168 | acl_free (acl); |
| 169 | |
| 170 | /* Since !MODE_INSIDE_ACL, we have to call chmod explicitly. */ |
| 171 | return chmod_or_fchmod (dst_name, dest_desc, mode); |
| 172 | |
| 173 | # endif |
| 174 | |
| 175 | #elif USE_ACL && defined GETACL /* Solaris, Cygwin, not HP-UX */ |
| 176 | |
| 177 | /* Solaris 2.5 through Solaris 10, Cygwin, and contemporaneous versions |
| 178 | of Unixware. The acl() call returns the access and default ACL both |
| 179 | at once. */ |
| 180 | # ifdef ACE_GETACL |
| 181 | int ace_count; |
| 182 | ace_t *ace_entries; |
| 183 | # endif |
| 184 | int count; |
| 185 | aclent_t *entries; |
| 186 | int did_chmod; |
| 187 | int saved_errno; |
| 188 | int ret; |
| 189 | |
| 190 | # ifdef ACE_GETACL |
| 191 | /* Solaris also has a different variant of ACLs, used in ZFS and NFSv4 |
| 192 | file systems (whereas the other ones are used in UFS file systems). |
| 193 | There is an API |
| 194 | pathconf (name, _PC_ACL_ENABLED) |
| 195 | fpathconf (desc, _PC_ACL_ENABLED) |
| 196 | that allows to determine which of the two kinds of ACLs is supported |
| 197 | for the given file. But some file systems may implement this call |
| 198 | incorrectly, so better not use it. |
| 199 | When fetching the source ACL, we simply fetch both ACL types. |
| 200 | When setting the destination ACL, we try either ACL types, assuming |
| 201 | that the kernel will translate the ACL from one form to the other. |
| 202 | (See in <http://docs.sun.com/app/docs/doc/819-2241/6n4huc7ia?l=en&a=view> |
| 203 | the description of ENOTSUP.) */ |
| 204 | for (;;) |
| 205 | { |
| 206 | ace_count = (source_desc != -1 |
| 207 | ? facl (source_desc, ACE_GETACLCNT, 0, NULL) |
| 208 | : acl (src_name, ACE_GETACLCNT, 0, NULL)); |
| 209 | |
| 210 | if (ace_count < 0) |
| 211 | { |
| 212 | if (errno == ENOSYS || errno == EINVAL) |
| 213 | { |
| 214 | ace_count = 0; |
| 215 | ace_entries = NULL; |
| 216 | break; |
| 217 | } |
| 218 | else |
| 219 | return -2; |
| 220 | } |
| 221 | |
| 222 | if (ace_count == 0) |
| 223 | { |
| 224 | ace_entries = NULL; |
| 225 | break; |
| 226 | } |
| 227 | |
| 228 | ace_entries = (ace_t *) malloc (ace_count * sizeof (ace_t)); |
| 229 | if (ace_entries == NULL) |
| 230 | { |
| 231 | errno = ENOMEM; |
| 232 | return -2; |
| 233 | } |
| 234 | |
| 235 | ret = (source_desc != -1 |
| 236 | ? facl (source_desc, ACE_GETACL, ace_count, ace_entries) |
| 237 | : acl (src_name, ACE_GETACL, ace_count, ace_entries)); |
| 238 | if (ret < 0) |
| 239 | { |
| 240 | free (ace_entries); |
| 241 | if (errno == ENOSYS || errno == EINVAL) |
| 242 | { |
| 243 | ace_count = 0; |
| 244 | ace_entries = NULL; |
| 245 | break; |
| 246 | } |
| 247 | else |
| 248 | return -2; |
| 249 | } |
| 250 | if (ret == ace_count) |
| 251 | break; |
| 252 | /* Huh? The number of ACL entries changed since the last call. |
| 253 | Repeat. */ |
| 254 | } |
| 255 | # endif |
| 256 | |
| 257 | for (;;) |
| 258 | { |
| 259 | count = (source_desc != -1 |
| 260 | ? facl (source_desc, GETACLCNT, 0, NULL) |
| 261 | : acl (src_name, GETACLCNT, 0, NULL)); |
| 262 | |
| 263 | if (count < 0) |
| 264 | { |
| 265 | if (errno == ENOSYS || errno == ENOTSUP || errno == EOPNOTSUPP) |
| 266 | { |
| 267 | count = 0; |
| 268 | entries = NULL; |
| 269 | break; |
| 270 | } |
| 271 | else |
| 272 | return -2; |
| 273 | } |
| 274 | |
| 275 | if (count == 0) |
| 276 | { |
| 277 | entries = NULL; |
| 278 | break; |
| 279 | } |
| 280 | |
| 281 | entries = (aclent_t *) malloc (count * sizeof (aclent_t)); |
| 282 | if (entries == NULL) |
| 283 | { |
| 284 | errno = ENOMEM; |
| 285 | return -2; |
| 286 | } |
| 287 | |
| 288 | if ((source_desc != -1 |
| 289 | ? facl (source_desc, GETACL, count, entries) |
| 290 | : acl (src_name, GETACL, count, entries)) |
| 291 | == count) |
| 292 | break; |
| 293 | /* Huh? The number of ACL entries changed since the last call. |
| 294 | Repeat. */ |
| 295 | } |
| 296 | |
| 297 | /* Is there an ACL of either kind? */ |
| 298 | # ifdef ACE_GETACL |
| 299 | if (ace_count == 0) |
| 300 | # endif |
| 301 | if (count == 0) |
| 302 | return qset_acl (dst_name, dest_desc, mode); |
| 303 | |
| 304 | did_chmod = 0; /* set to 1 once the mode bits in 0777 have been set */ |
| 305 | saved_errno = 0; /* the first non-ignorable error code */ |
| 306 | |
| 307 | if (!MODE_INSIDE_ACL) |
| 308 | { |
| 309 | /* On Cygwin, it is necessary to call chmod before acl, because |
| 310 | chmod can change the contents of the ACL (in ways that don't |
| 311 | change the allowed accesses, but still visible). */ |
| 312 | if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0) |
| 313 | saved_errno = errno; |
| 314 | did_chmod = 1; |
| 315 | } |
| 316 | |
| 317 | /* If both ace_entries and entries are available, try SETACL before |
| 318 | ACE_SETACL, because SETACL cannot fail with ENOTSUP whereas ACE_SETACL |
| 319 | can. */ |
| 320 | |
| 321 | if (count > 0) |
| 322 | { |
| 323 | ret = (dest_desc != -1 |
| 324 | ? facl (dest_desc, SETACL, count, entries) |
| 325 | : acl (dst_name, SETACL, count, entries)); |
| 326 | if (ret < 0 && saved_errno == 0) |
| 327 | { |
| 328 | saved_errno = errno; |
| 329 | if ((errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL) |
| 330 | && !acl_nontrivial (count, entries)) |
| 331 | saved_errno = 0; |
| 332 | } |
| 333 | else |
| 334 | did_chmod = 1; |
| 335 | } |
| 336 | free (entries); |
| 337 | |
| 338 | # ifdef ACE_GETACL |
| 339 | if (ace_count > 0) |
| 340 | { |
| 341 | ret = (dest_desc != -1 |
| 342 | ? facl (dest_desc, ACE_SETACL, ace_count, ace_entries) |
| 343 | : acl (dst_name, ACE_SETACL, ace_count, ace_entries)); |
| 344 | if (ret < 0 && saved_errno == 0) |
| 345 | { |
| 346 | saved_errno = errno; |
| 347 | if ((errno == ENOSYS || errno == EINVAL || errno == ENOTSUP) |
| 348 | && !acl_ace_nontrivial (ace_count, ace_entries)) |
| 349 | saved_errno = 0; |
| 350 | } |
| 351 | } |
| 352 | free (ace_entries); |
| 353 | # endif |
| 354 | |
| 355 | if (MODE_INSIDE_ACL |
| 356 | && did_chmod <= ((mode & (S_ISUID | S_ISGID | S_ISVTX)) ? 1 : 0)) |
| 357 | { |
| 358 | /* We did not call chmod so far, and either the mode and the ACL are |
| 359 | separate or special bits are to be set which don't fit into ACLs. */ |
| 360 | |
| 361 | if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0) |
| 362 | { |
| 363 | if (saved_errno == 0) |
| 364 | saved_errno = errno; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | if (saved_errno) |
| 369 | { |
| 370 | errno = saved_errno; |
| 371 | return -1; |
| 372 | } |
| 373 | return 0; |
| 374 | |
| 375 | #elif USE_ACL && HAVE_GETACL /* HP-UX */ |
| 376 | |
| 377 | struct acl_entry entries[NACLENTRIES]; |
| 378 | int count; |
| 379 | # if HAVE_ACLV_H |
| 380 | struct acl aclv_entries[NACLVENTRIES]; |
| 381 | int aclv_count; |
| 382 | # endif |
| 383 | int did_chmod; |
| 384 | int saved_errno; |
| 385 | int ret; |
| 386 | |
| 387 | count = (source_desc != -1 |
| 388 | ? fgetacl (source_desc, NACLENTRIES, entries) |
| 389 | : getacl (src_name, NACLENTRIES, entries)); |
| 390 | |
| 391 | if (count < 0) |
| 392 | { |
| 393 | if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP) |
| 394 | count = 0; |
| 395 | else |
| 396 | return -2; |
| 397 | } |
| 398 | else if (count > 0) |
| 399 | { |
| 400 | if (count > NACLENTRIES) |
| 401 | /* If NACLENTRIES cannot be trusted, use dynamic memory allocation. */ |
| 402 | abort (); |
| 403 | } |
| 404 | |
| 405 | # if HAVE_ACLV_H |
| 406 | aclv_count = acl ((char *) src_name, ACL_GET, NACLVENTRIES, aclv_entries); |
| 407 | |
| 408 | if (aclv_count < 0) |
| 409 | { |
| 410 | if (errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL) |
| 411 | count = 0; |
| 412 | else |
| 413 | return -2; |
| 414 | } |
| 415 | else if (aclv_count > 0) |
| 416 | { |
| 417 | if (aclv_count > NACLVENTRIES) |
| 418 | /* If NACLVENTRIES cannot be trusted, use dynamic memory allocation. */ |
| 419 | abort (); |
| 420 | } |
| 421 | # endif |
| 422 | |
| 423 | if (count == 0) |
| 424 | # if HAVE_ACLV_H |
| 425 | if (aclv_count == 0) |
| 426 | # endif |
| 427 | return qset_acl (dst_name, dest_desc, mode); |
| 428 | |
| 429 | did_chmod = 0; /* set to 1 once the mode bits in 0777 have been set */ |
| 430 | saved_errno = 0; /* the first non-ignorable error code */ |
| 431 | |
| 432 | if (count > 0) |
| 433 | { |
| 434 | ret = (dest_desc != -1 |
| 435 | ? fsetacl (dest_desc, count, entries) |
| 436 | : setacl (dst_name, count, entries)); |
| 437 | if (ret < 0 && saved_errno == 0) |
| 438 | { |
| 439 | saved_errno = errno; |
| 440 | if (errno == ENOSYS || errno == EOPNOTSUPP || errno == ENOTSUP) |
| 441 | { |
| 442 | struct stat source_statbuf; |
| 443 | |
| 444 | if ((source_desc != -1 |
| 445 | ? fstat (source_desc, &source_statbuf) |
| 446 | : stat (src_name, &source_statbuf)) == 0) |
| 447 | { |
| 448 | if (!acl_nontrivial (count, entries, &source_statbuf)) |
| 449 | saved_errno = 0; |
| 450 | } |
| 451 | else |
| 452 | saved_errno = errno; |
| 453 | } |
| 454 | } |
| 455 | else |
| 456 | did_chmod = 1; |
| 457 | } |
| 458 | |
| 459 | # if HAVE_ACLV_H |
| 460 | if (aclv_count > 0) |
| 461 | { |
| 462 | ret = acl ((char *) dst_name, ACL_SET, aclv_count, aclv_entries); |
| 463 | if (ret < 0 && saved_errno == 0) |
| 464 | { |
| 465 | saved_errno = errno; |
| 466 | if (errno == ENOSYS || errno == EOPNOTSUPP || errno == EINVAL) |
| 467 | { |
| 468 | if (!aclv_nontrivial (aclv_count, aclv_entries)) |
| 469 | saved_errno = 0; |
| 470 | } |
| 471 | } |
| 472 | else |
| 473 | did_chmod = 1; |
| 474 | } |
| 475 | # endif |
| 476 | |
| 477 | if (did_chmod <= ((mode & (S_ISUID | S_ISGID | S_ISVTX)) ? 1 : 0)) |
| 478 | { |
| 479 | /* We did not call chmod so far, and special bits are to be set which |
| 480 | don't fit into ACLs. */ |
| 481 | |
| 482 | if (chmod_or_fchmod (dst_name, dest_desc, mode) != 0) |
| 483 | { |
| 484 | if (saved_errno == 0) |
| 485 | saved_errno = errno; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | if (saved_errno) |
| 490 | { |
| 491 | errno = saved_errno; |
| 492 | return -1; |
| 493 | } |
| 494 | return 0; |
| 495 | |
| 496 | #elif USE_ACL && HAVE_ACLX_GET && 0 /* AIX */ |
| 497 | |
| 498 | /* TODO */ |
| 499 | |
| 500 | #elif USE_ACL && HAVE_STATACL /* older AIX */ |
| 501 | |
| 502 | union { struct acl a; char room[4096]; } u; |
| 503 | int ret; |
| 504 | |
| 505 | if ((source_desc != -1 |
| 506 | ? fstatacl (source_desc, STX_NORMAL, &u.a, sizeof (u)) |
| 507 | : statacl (src_name, STX_NORMAL, &u.a, sizeof (u))) |
| 508 | < 0) |
| 509 | return -2; |
| 510 | |
| 511 | ret = (dest_desc != -1 |
| 512 | ? fchacl (dest_desc, &u.a, u.a.acl_len) |
| 513 | : chacl (dst_name, &u.a, u.a.acl_len)); |
| 514 | if (ret < 0) |
| 515 | { |
| 516 | int saved_errno = errno; |
| 517 | |
| 518 | chmod_or_fchmod (dst_name, dest_desc, mode); |
| 519 | errno = saved_errno; |
| 520 | return -1; |
| 521 | } |
| 522 | |
| 523 | /* No need to call chmod_or_fchmod at this point, since the mode bits |
| 524 | S_ISUID, S_ISGID, S_ISVTX are also stored in the ACL. */ |
| 525 | |
| 526 | return 0; |
| 527 | |
| 528 | #elif USE_ACL && HAVE_ACLSORT /* NonStop Kernel */ |
| 529 | |
| 530 | struct acl entries[NACLENTRIES]; |
| 531 | int count; |
| 532 | int ret; |
| 533 | |
| 534 | count = acl ((char *) src_name, ACL_GET, NACLENTRIES, entries); |
| 535 | |
| 536 | if (count < 0) |
| 537 | { |
| 538 | if (0) |
| 539 | count = 0; |
| 540 | else |
| 541 | return -2; |
| 542 | } |
| 543 | else if (count > 0) |
| 544 | { |
| 545 | if (count > NACLENTRIES) |
| 546 | /* If NACLENTRIES cannot be trusted, use dynamic memory allocation. */ |
| 547 | abort (); |
| 548 | } |
| 549 | |
| 550 | if (count == 0) |
| 551 | return qset_acl (dst_name, dest_desc, mode); |
| 552 | |
| 553 | ret = acl ((char *) dst_name, ACL_SET, count, entries); |
| 554 | if (ret < 0) |
| 555 | { |
| 556 | int saved_errno = errno; |
| 557 | |
| 558 | if (0) |
| 559 | { |
| 560 | if (!acl_nontrivial (count, entries)) |
| 561 | return chmod_or_fchmod (dst_name, dest_desc, mode); |
| 562 | } |
| 563 | |
| 564 | chmod_or_fchmod (dst_name, dest_desc, mode); |
| 565 | errno = saved_errno; |
| 566 | return -1; |
| 567 | } |
| 568 | |
| 569 | if (mode & (S_ISUID | S_ISGID | S_ISVTX)) |
| 570 | { |
| 571 | /* We did not call chmod so far, and either the mode and the ACL are |
| 572 | separate or special bits are to be set which don't fit into ACLs. */ |
| 573 | |
| 574 | return chmod_or_fchmod (dst_name, dest_desc, mode); |
| 575 | } |
| 576 | return 0; |
| 577 | |
| 578 | #else |
| 579 | |
| 580 | return qset_acl (dst_name, dest_desc, mode); |
| 581 | |
| 582 | #endif |
| 583 | } |