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sys/kern/subr_acl_nfs4.c
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1 /*- 2 * Copyright (c) 2008-2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * ACL support routines specific to NFSv4 access control lists. These are 29 * utility routines for code common across file systems implementing NFSv4 30 * ACLs. 31 */ 32 33 #ifdef _KERNEL 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: releng/8.2/sys/kern/subr_acl_nfs4.c 214627 2010-11-01 15:43:42Z trasz $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mount.h> 40 #include <sys/priv.h> 41 #include <sys/vnode.h> 42 #include <sys/errno.h> 43 #include <sys/stat.h> 44 #include <sys/acl.h> 45 #else 46 #include <errno.h> 47 #include <assert.h> 48 #include <sys/acl.h> 49 #include <sys/stat.h> 50 #define KASSERT(a, b) assert(a) 51 #define CTASSERT(a) 52 #endif /* _KERNEL */ 53 54 #ifdef _KERNEL 55 56 static struct { 57 accmode_t accmode; 58 int mask; 59 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 60 {VWRITE, ACL_WRITE_DATA}, 61 {VAPPEND, ACL_APPEND_DATA}, 62 {VEXEC, ACL_EXECUTE}, 63 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 64 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 65 {VDELETE_CHILD, ACL_DELETE_CHILD}, 66 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 67 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 68 {VDELETE, ACL_DELETE}, 69 {VREAD_ACL, ACL_READ_ACL}, 70 {VWRITE_ACL, ACL_WRITE_ACL}, 71 {VWRITE_OWNER, ACL_WRITE_OWNER}, 72 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 73 {0, 0}}; 74 75 static int 76 _access_mask_from_accmode(accmode_t accmode) 77 { 78 int access_mask = 0, i; 79 80 for (i = 0; accmode2mask[i].accmode != 0; i++) { 81 if (accmode & accmode2mask[i].accmode) 82 access_mask |= accmode2mask[i].mask; 83 } 84 85 /* 86 * VAPPEND is just a modifier for VWRITE; if the caller asked 87 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 88 */ 89 if (access_mask & ACL_APPEND_DATA) 90 access_mask &= ~ACL_WRITE_DATA; 91 92 return (access_mask); 93 } 94 95 /* 96 * Return 0, iff access is allowed, 1 otherwise. 97 */ 98 static int 99 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 100 int file_uid, int file_gid, int *denied_explicitly) 101 { 102 int i; 103 const struct acl_entry *entry; 104 105 if (denied_explicitly != NULL) 106 *denied_explicitly = 0; 107 108 KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0")); 109 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 110 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 111 112 for (i = 0; i < aclp->acl_cnt; i++) { 113 entry = &(aclp->acl_entry[i]); 114 115 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 116 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 117 continue; 118 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 119 continue; 120 switch (entry->ae_tag) { 121 case ACL_USER_OBJ: 122 if (file_uid != cred->cr_uid) 123 continue; 124 break; 125 case ACL_USER: 126 if (entry->ae_id != cred->cr_uid) 127 continue; 128 break; 129 case ACL_GROUP_OBJ: 130 if (!groupmember(file_gid, cred)) 131 continue; 132 break; 133 case ACL_GROUP: 134 if (!groupmember(entry->ae_id, cred)) 135 continue; 136 break; 137 default: 138 KASSERT(entry->ae_tag == ACL_EVERYONE, 139 ("entry->ae_tag == ACL_EVERYONE")); 140 } 141 142 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 143 if (entry->ae_perm & access_mask) { 144 if (denied_explicitly != NULL) 145 *denied_explicitly = 1; 146 return (1); 147 } 148 } 149 150 access_mask &= ~(entry->ae_perm); 151 if (access_mask == 0) 152 return (0); 153 } 154 155 return (1); 156 } 157 158 int 159 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 160 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 161 { 162 accmode_t priv_granted = 0; 163 int denied, explicitly_denied, access_mask, is_directory, 164 must_be_owner = 0; 165 166 if (privused != NULL) 167 *privused = 0; 168 169 if (accmode & VADMIN) 170 must_be_owner = 1; 171 172 /* 173 * Ignore VSYNCHRONIZE permission. 174 */ 175 accmode &= ~VSYNCHRONIZE; 176 177 access_mask = _access_mask_from_accmode(accmode); 178 179 if (type == VDIR) 180 is_directory = 1; 181 else 182 is_directory = 0; 183 184 /* 185 * File owner is always allowed to read and write the ACL 186 * and basic attributes. This is to prevent a situation 187 * where user would change ACL in a way that prevents him 188 * from undoing the change. 189 */ 190 if (file_uid == cred->cr_uid) 191 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 192 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 193 194 /* 195 * Ignore append permission for regular files; use write 196 * permission instead. 197 */ 198 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 199 access_mask &= ~ACL_APPEND_DATA; 200 access_mask |= ACL_WRITE_DATA; 201 } 202 203 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 204 &explicitly_denied); 205 206 if (must_be_owner) { 207 if (file_uid != cred->cr_uid) 208 denied = EPERM; 209 } 210 211 if (!denied) 212 return (0); 213 214 /* 215 * Access failed. Iff it was not denied explicitly and 216 * VEXPLICIT_DENY flag was specified, allow access. 217 */ 218 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 219 return (0); 220 221 accmode &= ~VEXPLICIT_DENY; 222 223 /* 224 * No match. Try to use privileges, if there are any. 225 */ 226 if (is_directory) { 227 if ((accmode & VEXEC) && !priv_check_cred(cred, 228 PRIV_VFS_LOOKUP, 0)) 229 priv_granted |= VEXEC; 230 } else { 231 if ((accmode & VEXEC) && !priv_check_cred(cred, 232 PRIV_VFS_EXEC, 0)) 233 priv_granted |= VEXEC; 234 } 235 236 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 237 priv_granted |= VREAD; 238 239 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 240 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 241 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 242 243 if ((accmode & VADMIN_PERMS) && 244 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 245 priv_granted |= VADMIN_PERMS; 246 247 if ((accmode & VSTAT_PERMS) && 248 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 249 priv_granted |= VSTAT_PERMS; 250 251 if ((accmode & priv_granted) == accmode) { 252 if (privused != NULL) 253 *privused = 1; 254 255 return (0); 256 } 257 258 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 259 denied = EPERM; 260 else 261 denied = EACCES; 262 263 return (denied); 264 } 265 #endif /* _KERNEL */ 266 267 static int 268 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 269 acl_entry_type_t entry_type) 270 { 271 if (entry->ae_tag != tag) 272 return (0); 273 274 if (entry->ae_id != ACL_UNDEFINED_ID) 275 return (0); 276 277 if (entry->ae_perm != perm) 278 return (0); 279 280 if (entry->ae_entry_type != entry_type) 281 return (0); 282 283 if (entry->ae_flags != 0) 284 return (0); 285 286 return (1); 287 } 288 289 static struct acl_entry * 290 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 291 acl_entry_type_t entry_type) 292 { 293 struct acl_entry *entry; 294 295 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 296 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 297 298 entry = &(aclp->acl_entry[aclp->acl_cnt]); 299 aclp->acl_cnt++; 300 301 entry->ae_tag = tag; 302 entry->ae_id = ACL_UNDEFINED_ID; 303 entry->ae_perm = perm; 304 entry->ae_entry_type = entry_type; 305 entry->ae_flags = 0; 306 307 return (entry); 308 } 309 310 static struct acl_entry * 311 _acl_duplicate_entry(struct acl *aclp, int entry_index) 312 { 313 int i; 314 315 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 316 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 317 318 for (i = aclp->acl_cnt; i > entry_index; i--) 319 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 320 321 aclp->acl_cnt++; 322 323 return (&(aclp->acl_entry[entry_index + 1])); 324 } 325 326 /* 327 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 328 * Note that this results in an ACL different from (but semantically 329 * equal to) the "canonical six" trivial ACL computed using algorithm 330 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 331 */ 332 void 333 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 334 { 335 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 336 acl_perm_t user_allow, group_allow, everyone_allow; 337 338 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 339 340 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 341 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 342 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 343 ACL_WRITE_NAMED_ATTRS; 344 345 if (mode & S_IRUSR) 346 user_allow |= ACL_READ_DATA; 347 if (mode & S_IWUSR) 348 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 349 if (mode & S_IXUSR) 350 user_allow |= ACL_EXECUTE; 351 352 if (mode & S_IRGRP) 353 group_allow |= ACL_READ_DATA; 354 if (mode & S_IWGRP) 355 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 356 if (mode & S_IXGRP) 357 group_allow |= ACL_EXECUTE; 358 359 if (mode & S_IROTH) 360 everyone_allow |= ACL_READ_DATA; 361 if (mode & S_IWOTH) 362 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 363 if (mode & S_IXOTH) 364 everyone_allow |= ACL_EXECUTE; 365 366 user_deny = ((group_allow | everyone_allow) & ~user_allow); 367 group_deny = everyone_allow & ~group_allow; 368 user_allow_first = group_deny & ~user_deny; 369 370 if (user_allow_first != 0) 371 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, ACL_ENTRY_TYPE_ALLOW); 372 if (user_deny != 0) 373 _acl_append(aclp, ACL_USER_OBJ, user_deny, ACL_ENTRY_TYPE_DENY); 374 if (group_deny != 0) 375 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, ACL_ENTRY_TYPE_DENY); 376 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 377 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 378 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 379 } 380 381 void 382 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, int file_owner_id) 383 { 384 int i, meets, must_append; 385 struct acl_entry *entry, *copy, *previous, 386 *a1, *a2, *a3, *a4, *a5, *a6; 387 mode_t amode; 388 const int READ = 04; 389 const int WRITE = 02; 390 const int EXEC = 01; 391 392 KASSERT(aclp->acl_cnt >= 0, ("aclp->acl_cnt >= 0")); 393 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 394 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 395 396 /* 397 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 398 * 399 * 3.16.6.3. Applying a Mode to an Existing ACL 400 */ 401 402 /* 403 * 1. For each ACE: 404 */ 405 for (i = 0; i < aclp->acl_cnt; i++) { 406 entry = &(aclp->acl_entry[i]); 407 408 /* 409 * 1.1. If the type is neither ALLOW or DENY - skip. 410 */ 411 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 412 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 413 continue; 414 415 /* 416 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 417 */ 418 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 419 continue; 420 421 /* 422 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 423 * are set: 424 */ 425 if (entry->ae_flags & 426 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 427 /* 428 * 1.3.1. A copy of the current ACE is made, and placed 429 * in the ACL immediately following the current 430 * ACE. 431 */ 432 copy = _acl_duplicate_entry(aclp, i); 433 434 /* 435 * 1.3.2. In the first ACE, the flag 436 * ACL_ENTRY_INHERIT_ONLY is set. 437 */ 438 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 439 440 /* 441 * 1.3.3. In the second ACE, the following flags 442 * are cleared: 443 * ACL_ENTRY_FILE_INHERIT, 444 * ACL_ENTRY_DIRECTORY_INHERIT, 445 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 446 */ 447 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 448 ACL_ENTRY_DIRECTORY_INHERIT | 449 ACL_ENTRY_NO_PROPAGATE_INHERIT); 450 451 /* 452 * The algorithm continues on with the second ACE. 453 */ 454 i++; 455 entry = copy; 456 } 457 458 /* 459 * 1.4. If it's owner@, group@ or everyone@ entry, clear 460 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 461 * and ACL_EXECUTE. Continue to the next entry. 462 */ 463 if (entry->ae_tag == ACL_USER_OBJ || 464 entry->ae_tag == ACL_GROUP_OBJ || 465 entry->ae_tag == ACL_EVERYONE) { 466 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 467 ACL_APPEND_DATA | ACL_EXECUTE); 468 continue; 469 } 470 471 /* 472 * 1.5. Otherwise, if the "who" field did not match one 473 * of OWNER@, GROUP@, EVERYONE@: 474 * 475 * 1.5.1. If the type is ALLOW, check the preceding ACE. 476 * If it does not meet all of the following criteria: 477 */ 478 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 479 continue; 480 481 meets = 0; 482 if (i > 0) { 483 meets = 1; 484 previous = &(aclp->acl_entry[i - 1]); 485 486 /* 487 * 1.5.1.1. The type field is DENY, 488 */ 489 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 490 meets = 0; 491 492 /* 493 * 1.5.1.2. The "who" field is the same as the current 494 * ACE, 495 * 496 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 497 * is the same as it is in the current ACE, 498 * and no other flag bits are set, 499 */ 500 if (previous->ae_id != entry->ae_id || 501 previous->ae_tag != entry->ae_tag) 502 meets = 0; 503 504 if (previous->ae_flags) 505 meets = 0; 506 507 /* 508 * 1.5.1.4. The mask bits are a subset of the mask bits 509 * of the current ACE, and are also subset of 510 * the following: ACL_READ_DATA, 511 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 512 */ 513 if (previous->ae_perm & ~(entry->ae_perm)) 514 meets = 0; 515 516 if (previous->ae_perm & ~(ACL_READ_DATA | 517 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 518 meets = 0; 519 } 520 521 if (!meets) { 522 /* 523 * Then the ACE of type DENY, with a who equal 524 * to the current ACE, flag bits equal to 525 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 526 * and no mask bits, is prepended. 527 */ 528 previous = entry; 529 entry = _acl_duplicate_entry(aclp, i); 530 531 /* Adjust counter, as we've just added an entry. */ 532 i++; 533 534 previous->ae_tag = entry->ae_tag; 535 previous->ae_id = entry->ae_id; 536 previous->ae_flags = entry->ae_flags; 537 previous->ae_perm = 0; 538 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 539 } 540 541 /* 542 * 1.5.2. The following modifications are made to the prepended 543 * ACE. The intent is to mask the following ACE 544 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 545 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 546 * permissions of the new mode. As a special case, 547 * if the ACE matches the current owner of the file, 548 * the owner bits are used, rather than the group bits. 549 * This is reflected in the algorithm below. 550 */ 551 amode = mode >> 3; 552 553 /* 554 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 555 * in ACE matches the owner of the file, we shift amode three 556 * more bits, in order to have the owner permission bits 557 * placed in the three low order bits of amode. 558 */ 559 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 560 amode = amode >> 3; 561 562 if (entry->ae_perm & ACL_READ_DATA) { 563 if (amode & READ) 564 previous->ae_perm &= ~ACL_READ_DATA; 565 else 566 previous->ae_perm |= ACL_READ_DATA; 567 } 568 569 if (entry->ae_perm & ACL_WRITE_DATA) { 570 if (amode & WRITE) 571 previous->ae_perm &= ~ACL_WRITE_DATA; 572 else 573 previous->ae_perm |= ACL_WRITE_DATA; 574 } 575 576 if (entry->ae_perm & ACL_APPEND_DATA) { 577 if (amode & WRITE) 578 previous->ae_perm &= ~ACL_APPEND_DATA; 579 else 580 previous->ae_perm |= ACL_APPEND_DATA; 581 } 582 583 if (entry->ae_perm & ACL_EXECUTE) { 584 if (amode & EXEC) 585 previous->ae_perm &= ~ACL_EXECUTE; 586 else 587 previous->ae_perm |= ACL_EXECUTE; 588 } 589 590 /* 591 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 592 * of the ALLOW ace: 593 * 594 * XXX: This point is not there in the Falkner's draft. 595 */ 596 if (entry->ae_tag == ACL_GROUP && 597 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 598 mode_t extramode, ownermode; 599 extramode = (mode >> 3) & 07; 600 ownermode = mode >> 6; 601 extramode &= ~ownermode; 602 603 if (extramode) { 604 if (extramode & READ) { 605 entry->ae_perm &= ~ACL_READ_DATA; 606 previous->ae_perm &= ~ACL_READ_DATA; 607 } 608 609 if (extramode & WRITE) { 610 entry->ae_perm &= 611 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 612 previous->ae_perm &= 613 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 614 } 615 616 if (extramode & EXEC) { 617 entry->ae_perm &= ~ACL_EXECUTE; 618 previous->ae_perm &= ~ACL_EXECUTE; 619 } 620 } 621 } 622 } 623 624 /* 625 * 2. If there at least six ACEs, the final six ACEs are examined. 626 * If they are not equal to what we want, append six ACEs. 627 */ 628 must_append = 0; 629 if (aclp->acl_cnt < 6) { 630 must_append = 1; 631 } else { 632 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 633 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 634 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 635 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 636 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 637 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 638 639 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 640 ACL_ENTRY_TYPE_DENY)) 641 must_append = 1; 642 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 643 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 644 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 645 must_append = 1; 646 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 647 ACL_ENTRY_TYPE_DENY)) 648 must_append = 1; 649 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 650 ACL_ENTRY_TYPE_ALLOW)) 651 must_append = 1; 652 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 653 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 654 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 655 must_append = 1; 656 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 657 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 658 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 659 must_append = 1; 660 } 661 662 if (must_append) { 663 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 664 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 665 666 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 667 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 668 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 669 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 670 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 671 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 672 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 673 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 674 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 675 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 676 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 677 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 678 679 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 680 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 681 } 682 683 /* 684 * 3. The final six ACEs are adjusted according to the incoming mode. 685 */ 686 if (mode & S_IRUSR) 687 a2->ae_perm |= ACL_READ_DATA; 688 else 689 a1->ae_perm |= ACL_READ_DATA; 690 if (mode & S_IWUSR) 691 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 692 else 693 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 694 if (mode & S_IXUSR) 695 a2->ae_perm |= ACL_EXECUTE; 696 else 697 a1->ae_perm |= ACL_EXECUTE; 698 699 if (mode & S_IRGRP) 700 a4->ae_perm |= ACL_READ_DATA; 701 else 702 a3->ae_perm |= ACL_READ_DATA; 703 if (mode & S_IWGRP) 704 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 705 else 706 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 707 if (mode & S_IXGRP) 708 a4->ae_perm |= ACL_EXECUTE; 709 else 710 a3->ae_perm |= ACL_EXECUTE; 711 712 if (mode & S_IROTH) 713 a6->ae_perm |= ACL_READ_DATA; 714 else 715 a5->ae_perm |= ACL_READ_DATA; 716 if (mode & S_IWOTH) 717 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 718 else 719 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 720 if (mode & S_IXOTH) 721 a6->ae_perm |= ACL_EXECUTE; 722 else 723 a5->ae_perm |= ACL_EXECUTE; 724 } 725 726 void 727 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 728 { 729 int i; 730 mode_t old_mode = *_mode, mode = 0, seen = 0; 731 const struct acl_entry *entry; 732 733 KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0")); 734 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 735 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 736 737 /* 738 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 739 * 740 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 741 */ 742 743 for (i = 0; i < aclp->acl_cnt; i++) { 744 entry = &(aclp->acl_entry[i]); 745 746 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 747 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 748 continue; 749 750 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 751 continue; 752 753 if (entry->ae_tag == ACL_USER_OBJ) { 754 if ((entry->ae_perm & ACL_READ_DATA) && 755 ((seen & S_IRUSR) == 0)) { 756 seen |= S_IRUSR; 757 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 758 mode |= S_IRUSR; 759 } 760 if ((entry->ae_perm & ACL_WRITE_DATA) && 761 ((seen & S_IWUSR) == 0)) { 762 seen |= S_IWUSR; 763 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 764 mode |= S_IWUSR; 765 } 766 if ((entry->ae_perm & ACL_EXECUTE) && 767 ((seen & S_IXUSR) == 0)) { 768 seen |= S_IXUSR; 769 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 770 mode |= S_IXUSR; 771 } 772 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 773 if ((entry->ae_perm & ACL_READ_DATA) && 774 ((seen & S_IRGRP) == 0)) { 775 seen |= S_IRGRP; 776 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 777 mode |= S_IRGRP; 778 } 779 if ((entry->ae_perm & ACL_WRITE_DATA) && 780 ((seen & S_IWGRP) == 0)) { 781 seen |= S_IWGRP; 782 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 783 mode |= S_IWGRP; 784 } 785 if ((entry->ae_perm & ACL_EXECUTE) && 786 ((seen & S_IXGRP) == 0)) { 787 seen |= S_IXGRP; 788 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 789 mode |= S_IXGRP; 790 } 791 } else if (entry->ae_tag == ACL_EVERYONE) { 792 if (entry->ae_perm & ACL_READ_DATA) { 793 if ((seen & S_IRUSR) == 0) { 794 seen |= S_IRUSR; 795 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 796 mode |= S_IRUSR; 797 } 798 if ((seen & S_IRGRP) == 0) { 799 seen |= S_IRGRP; 800 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 801 mode |= S_IRGRP; 802 } 803 if ((seen & S_IROTH) == 0) { 804 seen |= S_IROTH; 805 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 806 mode |= S_IROTH; 807 } 808 } 809 if (entry->ae_perm & ACL_WRITE_DATA) { 810 if ((seen & S_IWUSR) == 0) { 811 seen |= S_IWUSR; 812 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 813 mode |= S_IWUSR; 814 } 815 if ((seen & S_IWGRP) == 0) { 816 seen |= S_IWGRP; 817 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 818 mode |= S_IWGRP; 819 } 820 if ((seen & S_IWOTH) == 0) { 821 seen |= S_IWOTH; 822 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 823 mode |= S_IWOTH; 824 } 825 } 826 if (entry->ae_perm & ACL_EXECUTE) { 827 if ((seen & S_IXUSR) == 0) { 828 seen |= S_IXUSR; 829 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 830 mode |= S_IXUSR; 831 } 832 if ((seen & S_IXGRP) == 0) { 833 seen |= S_IXGRP; 834 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 835 mode |= S_IXGRP; 836 } 837 if ((seen & S_IXOTH) == 0) { 838 seen |= S_IXOTH; 839 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 840 mode |= S_IXOTH; 841 } 842 } 843 } 844 } 845 846 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 847 } 848 849 void 850 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 851 struct acl *child_aclp, mode_t mode, int file_owner_id, 852 int is_directory) 853 { 854 int i, flags; 855 const struct acl_entry *parent_entry; 856 struct acl_entry *entry, *copy; 857 858 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 859 KASSERT(parent_aclp->acl_cnt > 0, ("parent_aclp->acl_cnt > 0")); 860 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 861 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 862 863 /* 864 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 865 * 866 * 3.16.6.2. Applying the mode given to CREATE or OPEN 867 * to an inherited ACL 868 */ 869 870 /* 871 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 872 */ 873 for (i = 0; i < parent_aclp->acl_cnt; i++) { 874 parent_entry = &(parent_aclp->acl_entry[i]); 875 flags = parent_entry->ae_flags; 876 877 /* 878 * Entry is not inheritable at all. 879 */ 880 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 881 ACL_ENTRY_FILE_INHERIT)) == 0) 882 continue; 883 884 /* 885 * We're creating a file, but entry is not inheritable 886 * by files. 887 */ 888 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 889 continue; 890 891 /* 892 * Entry is inheritable only by files, but has NO_PROPAGATE 893 * flag set, and we're creating a directory, so it wouldn't 894 * propagate to any file in that directory anyway. 895 */ 896 if (is_directory && 897 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 898 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 899 continue; 900 901 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 902 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 903 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 904 child_aclp->acl_cnt++; 905 } 906 907 /* 908 * 2. For each entry in the new ACL, adjust its flags, possibly 909 * creating two entries in place of one. 910 */ 911 for (i = 0; i < child_aclp->acl_cnt; i++) { 912 entry = &(child_aclp->acl_entry[i]); 913 914 /* 915 * This is not in the specification, but SunOS 916 * apparently does that. 917 */ 918 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 919 !is_directory) && 920 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 921 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 922 923 /* 924 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 925 * being created is not a directory, then clear the 926 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 927 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 928 * ACL_ENTRY_INHERIT_ONLY. 929 */ 930 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 931 !is_directory) { 932 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 933 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 934 ACL_ENTRY_INHERIT_ONLY); 935 936 /* 937 * Continue on to the next ACE. 938 */ 939 continue; 940 } 941 942 /* 943 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 944 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 945 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 946 * next ACE. Otherwise... 947 */ 948 /* 949 * XXX: Read it again and make sure what does the "otherwise" 950 * apply to. 951 */ 952 if (is_directory && 953 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 954 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 955 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 956 continue; 957 } 958 959 /* 960 * 2.C. If the type of the ACE is neither ALLOW nor deny, 961 * then continue. 962 */ 963 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 964 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 965 continue; 966 967 /* 968 * 2.D. Copy the original ACE into a second, adjacent ACE. 969 */ 970 copy = _acl_duplicate_entry(child_aclp, i); 971 972 /* 973 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 974 * is set. 975 */ 976 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 977 978 /* 979 * 2.F. On the second ACE, clear the following flags: 980 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 981 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 982 */ 983 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 984 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 985 ACL_ENTRY_INHERIT_ONLY); 986 987 /* 988 * 2.G. On the second ACE, if the type is ALLOW, 989 * an implementation MAY clear the following 990 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 991 */ 992 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 993 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 994 995 /* 996 * Increment the counter to skip the copied entry. 997 */ 998 i++; 999 } 1000 1001 /* 1002 * 3. To ensure that the mode is honored, apply the algorithm describe 1003 * in Section 2.16.6.3, using the mode that is to be used for file 1004 * creation. 1005 */ 1006 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1007 } 1008 1009 #ifdef _KERNEL 1010 static int 1011 _acls_are_equal(const struct acl *a, const struct acl *b) 1012 { 1013 int i; 1014 const struct acl_entry *entrya, *entryb; 1015 1016 if (a->acl_cnt != b->acl_cnt) 1017 return (0); 1018 1019 for (i = 0; i < b->acl_cnt; i++) { 1020 entrya = &(a->acl_entry[i]); 1021 entryb = &(b->acl_entry[i]); 1022 1023 if (entrya->ae_tag != entryb->ae_tag || 1024 entrya->ae_id != entryb->ae_id || 1025 entrya->ae_perm != entryb->ae_perm || 1026 entrya->ae_entry_type != entryb->ae_entry_type || 1027 entrya->ae_flags != entryb->ae_flags) 1028 return (0); 1029 } 1030 1031 return (1); 1032 } 1033 1034 /* 1035 * This routine is used to determine whether to remove entry_type attribute 1036 * that stores ACL contents. 1037 */ 1038 int 1039 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1040 { 1041 int trivial; 1042 mode_t tmpmode = 0; 1043 struct acl *tmpaclp; 1044 1045 if (aclp->acl_cnt != 6) 1046 return (0); 1047 1048 /* 1049 * Compute the mode from the ACL, then compute new ACL from that mode. 1050 * If the ACLs are identical, then the ACL is trivial. 1051 * 1052 * XXX: I guess there is a faster way to do this. However, even 1053 * this slow implementation significantly speeds things up 1054 * for files that don't have any entry_type ACL entries - it's 1055 * critical for performance to not use EA when they are not 1056 * needed. 1057 */ 1058 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1059 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1060 acl_nfs4_sync_acl_from_mode(tmpaclp, tmpmode, file_owner_id); 1061 trivial = _acls_are_equal(aclp, tmpaclp); 1062 acl_free(tmpaclp); 1063 1064 return (trivial); 1065 } 1066 #endif /* _KERNEL */ 1067 1068 int 1069 acl_nfs4_check(const struct acl *aclp, int is_directory) 1070 { 1071 int i; 1072 const struct acl_entry *entry; 1073 1074 /* 1075 * The spec doesn't seem to say anything about ACL validity. 1076 * It seems there is not much to do here. There is even no need 1077 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1078 * entries, as there can be several of them and that's perfectly 1079 * valid. There can be none of them too. Really. 1080 */ 1081 1082 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1083 return (EINVAL); 1084 1085 for (i = 0; i < aclp->acl_cnt; i++) { 1086 entry = &(aclp->acl_entry[i]); 1087 1088 switch (entry->ae_tag) { 1089 case ACL_USER_OBJ: 1090 case ACL_GROUP_OBJ: 1091 case ACL_EVERYONE: 1092 if (entry->ae_id != ACL_UNDEFINED_ID) 1093 return (EINVAL); 1094 break; 1095 1096 case ACL_USER: 1097 case ACL_GROUP: 1098 if (entry->ae_id == ACL_UNDEFINED_ID) 1099 return (EINVAL); 1100 break; 1101 1102 default: 1103 return (EINVAL); 1104 } 1105 1106 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1107 return (EINVAL); 1108 1109 /* 1110 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1111 */ 1112 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1113 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1114 return (EINVAL); 1115 1116 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1117 return (EINVAL); 1118 1119 /* Disallow unimplemented flags. */ 1120 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1121 ACL_ENTRY_FAILED_ACCESS)) 1122 return (EINVAL); 1123 1124 /* Disallow flags not allowed for ordinary files. */ 1125 if (!is_directory) { 1126 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1127 ACL_ENTRY_DIRECTORY_INHERIT | 1128 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1129 return (EINVAL); 1130 } 1131 } 1132 1133 return (0); 1134 }
Cache object: e3deed3b9d2d1bbedf5a050194548961
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