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FreeBSD/Linux Kernel Cross Reference
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/8.1/sys/kern/subr_acl_nfs4.c 205771 2010-03-27 18:12:00Z 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 void 327 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, int file_owner_id) 328 { 329 int i, meets, must_append; 330 struct acl_entry *entry, *copy, *previous, 331 *a1, *a2, *a3, *a4, *a5, *a6; 332 mode_t amode; 333 const int READ = 04; 334 const int WRITE = 02; 335 const int EXEC = 01; 336 337 KASSERT(aclp->acl_cnt >= 0, ("aclp->acl_cnt >= 0")); 338 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 339 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 340 341 /* 342 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 343 * 344 * 3.16.6.3. Applying a Mode to an Existing ACL 345 */ 346 347 /* 348 * 1. For each ACE: 349 */ 350 for (i = 0; i < aclp->acl_cnt; i++) { 351 entry = &(aclp->acl_entry[i]); 352 353 /* 354 * 1.1. If the type is neither ALLOW or DENY - skip. 355 */ 356 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 357 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 358 continue; 359 360 /* 361 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 362 */ 363 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 364 continue; 365 366 /* 367 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 368 * are set: 369 */ 370 if (entry->ae_flags & 371 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 372 /* 373 * 1.3.1. A copy of the current ACE is made, and placed 374 * in the ACL immediately following the current 375 * ACE. 376 */ 377 copy = _acl_duplicate_entry(aclp, i); 378 379 /* 380 * 1.3.2. In the first ACE, the flag 381 * ACL_ENTRY_INHERIT_ONLY is set. 382 */ 383 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 384 385 /* 386 * 1.3.3. In the second ACE, the following flags 387 * are cleared: 388 * ACL_ENTRY_FILE_INHERIT, 389 * ACL_ENTRY_DIRECTORY_INHERIT, 390 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 391 */ 392 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 393 ACL_ENTRY_DIRECTORY_INHERIT | 394 ACL_ENTRY_NO_PROPAGATE_INHERIT); 395 396 /* 397 * The algorithm continues on with the second ACE. 398 */ 399 i++; 400 entry = copy; 401 } 402 403 /* 404 * 1.4. If it's owner@, group@ or everyone@ entry, clear 405 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 406 * and ACL_EXECUTE. Continue to the next entry. 407 */ 408 if (entry->ae_tag == ACL_USER_OBJ || 409 entry->ae_tag == ACL_GROUP_OBJ || 410 entry->ae_tag == ACL_EVERYONE) { 411 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 412 ACL_APPEND_DATA | ACL_EXECUTE); 413 continue; 414 } 415 416 /* 417 * 1.5. Otherwise, if the "who" field did not match one 418 * of OWNER@, GROUP@, EVERYONE@: 419 * 420 * 1.5.1. If the type is ALLOW, check the preceding ACE. 421 * If it does not meet all of the following criteria: 422 */ 423 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 424 continue; 425 426 meets = 0; 427 if (i > 0) { 428 meets = 1; 429 previous = &(aclp->acl_entry[i - 1]); 430 431 /* 432 * 1.5.1.1. The type field is DENY, 433 */ 434 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 435 meets = 0; 436 437 /* 438 * 1.5.1.2. The "who" field is the same as the current 439 * ACE, 440 * 441 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 442 * is the same as it is in the current ACE, 443 * and no other flag bits are set, 444 */ 445 if (previous->ae_id != entry->ae_id || 446 previous->ae_tag != entry->ae_tag) 447 meets = 0; 448 449 if (previous->ae_flags) 450 meets = 0; 451 452 /* 453 * 1.5.1.4. The mask bits are a subset of the mask bits 454 * of the current ACE, and are also subset of 455 * the following: ACL_READ_DATA, 456 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 457 */ 458 if (previous->ae_perm & ~(entry->ae_perm)) 459 meets = 0; 460 461 if (previous->ae_perm & ~(ACL_READ_DATA | 462 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 463 meets = 0; 464 } 465 466 if (!meets) { 467 /* 468 * Then the ACE of type DENY, with a who equal 469 * to the current ACE, flag bits equal to 470 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 471 * and no mask bits, is prepended. 472 */ 473 previous = entry; 474 entry = _acl_duplicate_entry(aclp, i); 475 476 /* Adjust counter, as we've just added an entry. */ 477 i++; 478 479 previous->ae_tag = entry->ae_tag; 480 previous->ae_id = entry->ae_id; 481 previous->ae_flags = entry->ae_flags; 482 previous->ae_perm = 0; 483 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 484 } 485 486 /* 487 * 1.5.2. The following modifications are made to the prepended 488 * ACE. The intent is to mask the following ACE 489 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 490 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 491 * permissions of the new mode. As a special case, 492 * if the ACE matches the current owner of the file, 493 * the owner bits are used, rather than the group bits. 494 * This is reflected in the algorithm below. 495 */ 496 amode = mode >> 3; 497 498 /* 499 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 500 * in ACE matches the owner of the file, we shift amode three 501 * more bits, in order to have the owner permission bits 502 * placed in the three low order bits of amode. 503 */ 504 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 505 amode = amode >> 3; 506 507 if (entry->ae_perm & ACL_READ_DATA) { 508 if (amode & READ) 509 previous->ae_perm &= ~ACL_READ_DATA; 510 else 511 previous->ae_perm |= ACL_READ_DATA; 512 } 513 514 if (entry->ae_perm & ACL_WRITE_DATA) { 515 if (amode & WRITE) 516 previous->ae_perm &= ~ACL_WRITE_DATA; 517 else 518 previous->ae_perm |= ACL_WRITE_DATA; 519 } 520 521 if (entry->ae_perm & ACL_APPEND_DATA) { 522 if (amode & WRITE) 523 previous->ae_perm &= ~ACL_APPEND_DATA; 524 else 525 previous->ae_perm |= ACL_APPEND_DATA; 526 } 527 528 if (entry->ae_perm & ACL_EXECUTE) { 529 if (amode & EXEC) 530 previous->ae_perm &= ~ACL_EXECUTE; 531 else 532 previous->ae_perm |= ACL_EXECUTE; 533 } 534 535 /* 536 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 537 * of the ALLOW ace: 538 * 539 * XXX: This point is not there in the Falkner's draft. 540 */ 541 if (entry->ae_tag == ACL_GROUP && 542 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 543 mode_t extramode, ownermode; 544 extramode = (mode >> 3) & 07; 545 ownermode = mode >> 6; 546 extramode &= ~ownermode; 547 548 if (extramode) { 549 if (extramode & READ) { 550 entry->ae_perm &= ~ACL_READ_DATA; 551 previous->ae_perm &= ~ACL_READ_DATA; 552 } 553 554 if (extramode & WRITE) { 555 entry->ae_perm &= 556 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 557 previous->ae_perm &= 558 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 559 } 560 561 if (extramode & EXEC) { 562 entry->ae_perm &= ~ACL_EXECUTE; 563 previous->ae_perm &= ~ACL_EXECUTE; 564 } 565 } 566 } 567 } 568 569 /* 570 * 2. If there at least six ACEs, the final six ACEs are examined. 571 * If they are not equal to what we want, append six ACEs. 572 */ 573 must_append = 0; 574 if (aclp->acl_cnt < 6) { 575 must_append = 1; 576 } else { 577 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 578 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 579 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 580 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 581 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 582 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 583 584 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 585 ACL_ENTRY_TYPE_DENY)) 586 must_append = 1; 587 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 588 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 589 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 590 must_append = 1; 591 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 592 ACL_ENTRY_TYPE_DENY)) 593 must_append = 1; 594 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 595 ACL_ENTRY_TYPE_ALLOW)) 596 must_append = 1; 597 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 598 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 599 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 600 must_append = 1; 601 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 602 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 603 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 604 must_append = 1; 605 } 606 607 if (must_append) { 608 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 609 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 610 611 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 612 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 613 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 614 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 615 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 616 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 617 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 618 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 619 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 620 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 621 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 622 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 623 624 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 625 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 626 } 627 628 /* 629 * 3. The final six ACEs are adjusted according to the incoming mode. 630 */ 631 if (mode & S_IRUSR) 632 a2->ae_perm |= ACL_READ_DATA; 633 else 634 a1->ae_perm |= ACL_READ_DATA; 635 if (mode & S_IWUSR) 636 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 637 else 638 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 639 if (mode & S_IXUSR) 640 a2->ae_perm |= ACL_EXECUTE; 641 else 642 a1->ae_perm |= ACL_EXECUTE; 643 644 if (mode & S_IRGRP) 645 a4->ae_perm |= ACL_READ_DATA; 646 else 647 a3->ae_perm |= ACL_READ_DATA; 648 if (mode & S_IWGRP) 649 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 650 else 651 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 652 if (mode & S_IXGRP) 653 a4->ae_perm |= ACL_EXECUTE; 654 else 655 a3->ae_perm |= ACL_EXECUTE; 656 657 if (mode & S_IROTH) 658 a6->ae_perm |= ACL_READ_DATA; 659 else 660 a5->ae_perm |= ACL_READ_DATA; 661 if (mode & S_IWOTH) 662 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 663 else 664 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 665 if (mode & S_IXOTH) 666 a6->ae_perm |= ACL_EXECUTE; 667 else 668 a5->ae_perm |= ACL_EXECUTE; 669 } 670 671 void 672 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 673 { 674 int i; 675 mode_t old_mode = *_mode, mode = 0, seen = 0; 676 const struct acl_entry *entry; 677 678 KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0")); 679 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 680 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 681 682 /* 683 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 684 * 685 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 686 */ 687 688 for (i = 0; i < aclp->acl_cnt; i++) { 689 entry = &(aclp->acl_entry[i]); 690 691 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 692 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 693 continue; 694 695 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 696 continue; 697 698 if (entry->ae_tag == ACL_USER_OBJ) { 699 if ((entry->ae_perm & ACL_READ_DATA) && 700 ((seen & S_IRUSR) == 0)) { 701 seen |= S_IRUSR; 702 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 703 mode |= S_IRUSR; 704 } 705 if ((entry->ae_perm & ACL_WRITE_DATA) && 706 ((seen & S_IWUSR) == 0)) { 707 seen |= S_IWUSR; 708 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 709 mode |= S_IWUSR; 710 } 711 if ((entry->ae_perm & ACL_EXECUTE) && 712 ((seen & S_IXUSR) == 0)) { 713 seen |= S_IXUSR; 714 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 715 mode |= S_IXUSR; 716 } 717 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 718 if ((entry->ae_perm & ACL_READ_DATA) && 719 ((seen & S_IRGRP) == 0)) { 720 seen |= S_IRGRP; 721 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 722 mode |= S_IRGRP; 723 } 724 if ((entry->ae_perm & ACL_WRITE_DATA) && 725 ((seen & S_IWGRP) == 0)) { 726 seen |= S_IWGRP; 727 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 728 mode |= S_IWGRP; 729 } 730 if ((entry->ae_perm & ACL_EXECUTE) && 731 ((seen & S_IXGRP) == 0)) { 732 seen |= S_IXGRP; 733 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 734 mode |= S_IXGRP; 735 } 736 } else if (entry->ae_tag == ACL_EVERYONE) { 737 if (entry->ae_perm & ACL_READ_DATA) { 738 if ((seen & S_IRUSR) == 0) { 739 seen |= S_IRUSR; 740 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 741 mode |= S_IRUSR; 742 } 743 if ((seen & S_IRGRP) == 0) { 744 seen |= S_IRGRP; 745 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 746 mode |= S_IRGRP; 747 } 748 if ((seen & S_IROTH) == 0) { 749 seen |= S_IROTH; 750 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 751 mode |= S_IROTH; 752 } 753 } 754 if (entry->ae_perm & ACL_WRITE_DATA) { 755 if ((seen & S_IWUSR) == 0) { 756 seen |= S_IWUSR; 757 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 758 mode |= S_IWUSR; 759 } 760 if ((seen & S_IWGRP) == 0) { 761 seen |= S_IWGRP; 762 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 763 mode |= S_IWGRP; 764 } 765 if ((seen & S_IWOTH) == 0) { 766 seen |= S_IWOTH; 767 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 768 mode |= S_IWOTH; 769 } 770 } 771 if (entry->ae_perm & ACL_EXECUTE) { 772 if ((seen & S_IXUSR) == 0) { 773 seen |= S_IXUSR; 774 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 775 mode |= S_IXUSR; 776 } 777 if ((seen & S_IXGRP) == 0) { 778 seen |= S_IXGRP; 779 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 780 mode |= S_IXGRP; 781 } 782 if ((seen & S_IXOTH) == 0) { 783 seen |= S_IXOTH; 784 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 785 mode |= S_IXOTH; 786 } 787 } 788 } 789 } 790 791 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 792 } 793 794 void 795 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 796 struct acl *child_aclp, mode_t mode, int file_owner_id, 797 int is_directory) 798 { 799 int i, flags; 800 const struct acl_entry *parent_entry; 801 struct acl_entry *entry, *copy; 802 803 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 804 KASSERT(parent_aclp->acl_cnt > 0, ("parent_aclp->acl_cnt > 0")); 805 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 806 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 807 808 /* 809 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 810 * 811 * 3.16.6.2. Applying the mode given to CREATE or OPEN 812 * to an inherited ACL 813 */ 814 815 /* 816 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 817 */ 818 for (i = 0; i < parent_aclp->acl_cnt; i++) { 819 parent_entry = &(parent_aclp->acl_entry[i]); 820 flags = parent_entry->ae_flags; 821 822 /* 823 * Entry is not inheritable at all. 824 */ 825 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 826 ACL_ENTRY_FILE_INHERIT)) == 0) 827 continue; 828 829 /* 830 * We're creating a file, but entry is not inheritable 831 * by files. 832 */ 833 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 834 continue; 835 836 /* 837 * Entry is inheritable only by files, but has NO_PROPAGATE 838 * flag set, and we're creating a directory, so it wouldn't 839 * propagate to any file in that directory anyway. 840 */ 841 if (is_directory && 842 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 843 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 844 continue; 845 846 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 847 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 848 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 849 child_aclp->acl_cnt++; 850 } 851 852 /* 853 * 2. For each entry in the new ACL, adjust its flags, possibly 854 * creating two entries in place of one. 855 */ 856 for (i = 0; i < child_aclp->acl_cnt; i++) { 857 entry = &(child_aclp->acl_entry[i]); 858 859 /* 860 * This is not in the specification, but SunOS 861 * apparently does that. 862 */ 863 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 864 !is_directory) && 865 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 866 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 867 868 /* 869 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 870 * being created is not a directory, then clear the 871 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 872 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 873 * ACL_ENTRY_INHERIT_ONLY. 874 */ 875 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 876 !is_directory) { 877 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 878 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 879 ACL_ENTRY_INHERIT_ONLY); 880 881 /* 882 * Continue on to the next ACE. 883 */ 884 continue; 885 } 886 887 /* 888 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 889 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 890 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 891 * next ACE. Otherwise... 892 */ 893 /* 894 * XXX: Read it again and make sure what does the "otherwise" 895 * apply to. 896 */ 897 if (is_directory && 898 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 899 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 900 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 901 continue; 902 } 903 904 /* 905 * 2.C. If the type of the ACE is neither ALLOW nor deny, 906 * then continue. 907 */ 908 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 909 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 910 continue; 911 912 /* 913 * 2.D. Copy the original ACE into a second, adjacent ACE. 914 */ 915 copy = _acl_duplicate_entry(child_aclp, i); 916 917 /* 918 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 919 * is set. 920 */ 921 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 922 923 /* 924 * 2.F. On the second ACE, clear the following flags: 925 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 926 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 927 */ 928 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 929 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 930 ACL_ENTRY_INHERIT_ONLY); 931 932 /* 933 * 2.G. On the second ACE, if the type is ALLOW, 934 * an implementation MAY clear the following 935 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 936 */ 937 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 938 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 939 940 /* 941 * Increment the counter to skip the copied entry. 942 */ 943 i++; 944 } 945 946 /* 947 * 3. To ensure that the mode is honored, apply the algorithm describe 948 * in Section 2.16.6.3, using the mode that is to be used for file 949 * creation. 950 */ 951 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 952 } 953 954 #ifdef _KERNEL 955 static int 956 _acls_are_equal(const struct acl *a, const struct acl *b) 957 { 958 int i; 959 const struct acl_entry *entrya, *entryb; 960 961 if (a->acl_cnt != b->acl_cnt) 962 return (0); 963 964 for (i = 0; i < b->acl_cnt; i++) { 965 entrya = &(a->acl_entry[i]); 966 entryb = &(b->acl_entry[i]); 967 968 if (entrya->ae_tag != entryb->ae_tag || 969 entrya->ae_id != entryb->ae_id || 970 entrya->ae_perm != entryb->ae_perm || 971 entrya->ae_entry_type != entryb->ae_entry_type || 972 entrya->ae_flags != entryb->ae_flags) 973 return (0); 974 } 975 976 return (1); 977 } 978 979 /* 980 * This routine is used to determine whether to remove entry_type attribute 981 * that stores ACL contents. 982 */ 983 int 984 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 985 { 986 int trivial; 987 mode_t tmpmode = 0; 988 struct acl *tmpaclp; 989 990 if (aclp->acl_cnt != 6) 991 return (0); 992 993 /* 994 * Compute the mode from the ACL, then compute new ACL from that mode. 995 * If the ACLs are identical, then the ACL is trivial. 996 * 997 * XXX: I guess there is a faster way to do this. However, even 998 * this slow implementation significantly speeds things up 999 * for files that don't have any entry_type ACL entries - it's 1000 * critical for performance to not use EA when they are not 1001 * needed. 1002 */ 1003 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1004 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1005 acl_nfs4_sync_acl_from_mode(tmpaclp, tmpmode, file_owner_id); 1006 trivial = _acls_are_equal(aclp, tmpaclp); 1007 acl_free(tmpaclp); 1008 1009 return (trivial); 1010 } 1011 #endif /* _KERNEL */ 1012 1013 int 1014 acl_nfs4_check(const struct acl *aclp, int is_directory) 1015 { 1016 int i; 1017 const struct acl_entry *entry; 1018 1019 /* 1020 * The spec doesn't seem to say anything about ACL validity. 1021 * It seems there is not much to do here. There is even no need 1022 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1023 * entries, as there can be several of them and that's perfectly 1024 * valid. There can be none of them too. Really. 1025 */ 1026 1027 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1028 return (EINVAL); 1029 1030 for (i = 0; i < aclp->acl_cnt; i++) { 1031 entry = &(aclp->acl_entry[i]); 1032 1033 switch (entry->ae_tag) { 1034 case ACL_USER_OBJ: 1035 case ACL_GROUP_OBJ: 1036 case ACL_EVERYONE: 1037 if (entry->ae_id != ACL_UNDEFINED_ID) 1038 return (EINVAL); 1039 break; 1040 1041 case ACL_USER: 1042 case ACL_GROUP: 1043 if (entry->ae_id == ACL_UNDEFINED_ID) 1044 return (EINVAL); 1045 break; 1046 1047 default: 1048 return (EINVAL); 1049 } 1050 1051 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1052 return (EINVAL); 1053 1054 /* 1055 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1056 */ 1057 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1058 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1059 return (EINVAL); 1060 1061 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1062 return (EINVAL); 1063 1064 /* Disallow unimplemented flags. */ 1065 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1066 ACL_ENTRY_FAILED_ACCESS)) 1067 return (EINVAL); 1068 1069 /* Disallow flags not allowed for ordinary files. */ 1070 if (!is_directory) { 1071 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1072 ACL_ENTRY_DIRECTORY_INHERIT | 1073 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1074 return (EINVAL); 1075 } 1076 } 1077 1078 return (0); 1079 }
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