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sys/kern/subr_acl_nfs4.c
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1 /*- 2 * Copyright (c) 2008-2010 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("$FreeBSD$"); 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/sysctl.h> 45 #include <sys/acl.h> 46 #else 47 #include <errno.h> 48 #include <assert.h> 49 #include <sys/acl.h> 50 #include <sys/stat.h> 51 #define KASSERT(a, b) assert(a) 52 #define CTASSERT(a) 53 54 #endif /* !_KERNEL */ 55 56 #ifdef _KERNEL 57 58 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 59 60 static int acl_nfs4_old_semantics = 0; 61 62 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 63 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 64 65 static struct { 66 accmode_t accmode; 67 int mask; 68 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 69 {VWRITE, ACL_WRITE_DATA}, 70 {VAPPEND, ACL_APPEND_DATA}, 71 {VEXEC, ACL_EXECUTE}, 72 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 73 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 74 {VDELETE_CHILD, ACL_DELETE_CHILD}, 75 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 76 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 77 {VDELETE, ACL_DELETE}, 78 {VREAD_ACL, ACL_READ_ACL}, 79 {VWRITE_ACL, ACL_WRITE_ACL}, 80 {VWRITE_OWNER, ACL_WRITE_OWNER}, 81 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 82 {0, 0}}; 83 84 static int 85 _access_mask_from_accmode(accmode_t accmode) 86 { 87 int access_mask = 0, i; 88 89 for (i = 0; accmode2mask[i].accmode != 0; i++) { 90 if (accmode & accmode2mask[i].accmode) 91 access_mask |= accmode2mask[i].mask; 92 } 93 94 /* 95 * VAPPEND is just a modifier for VWRITE; if the caller asked 96 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 97 */ 98 if (access_mask & ACL_APPEND_DATA) 99 access_mask &= ~ACL_WRITE_DATA; 100 101 return (access_mask); 102 } 103 104 /* 105 * Return 0, iff access is allowed, 1 otherwise. 106 */ 107 static int 108 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 109 int file_uid, int file_gid, int *denied_explicitly) 110 { 111 int i; 112 const struct acl_entry *entry; 113 114 if (denied_explicitly != NULL) 115 *denied_explicitly = 0; 116 117 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 118 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 119 120 for (i = 0; i < aclp->acl_cnt; i++) { 121 entry = &(aclp->acl_entry[i]); 122 123 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 124 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 125 continue; 126 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 127 continue; 128 switch (entry->ae_tag) { 129 case ACL_USER_OBJ: 130 if (file_uid != cred->cr_uid) 131 continue; 132 break; 133 case ACL_USER: 134 if (entry->ae_id != cred->cr_uid) 135 continue; 136 break; 137 case ACL_GROUP_OBJ: 138 if (!groupmember(file_gid, cred)) 139 continue; 140 break; 141 case ACL_GROUP: 142 if (!groupmember(entry->ae_id, cred)) 143 continue; 144 break; 145 default: 146 KASSERT(entry->ae_tag == ACL_EVERYONE, 147 ("entry->ae_tag == ACL_EVERYONE")); 148 } 149 150 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 151 if (entry->ae_perm & access_mask) { 152 if (denied_explicitly != NULL) 153 *denied_explicitly = 1; 154 return (1); 155 } 156 } 157 158 access_mask &= ~(entry->ae_perm); 159 if (access_mask == 0) 160 return (0); 161 } 162 163 if (access_mask == 0) 164 return (0); 165 166 return (1); 167 } 168 169 int 170 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 171 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 172 { 173 accmode_t priv_granted = 0; 174 int denied, explicitly_denied, access_mask, is_directory, 175 must_be_owner = 0; 176 mode_t file_mode = 0; 177 178 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 179 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 180 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 181 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 182 ("invalid bit in accmode")); 183 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 184 ("VAPPEND without VWRITE")); 185 186 if (privused != NULL) 187 *privused = 0; 188 189 if (accmode & VADMIN) 190 must_be_owner = 1; 191 192 /* 193 * Ignore VSYNCHRONIZE permission. 194 */ 195 accmode &= ~VSYNCHRONIZE; 196 197 access_mask = _access_mask_from_accmode(accmode); 198 199 if (type == VDIR) 200 is_directory = 1; 201 else 202 is_directory = 0; 203 204 /* 205 * File owner is always allowed to read and write the ACL 206 * and basic attributes. This is to prevent a situation 207 * where user would change ACL in a way that prevents him 208 * from undoing the change. 209 */ 210 if (file_uid == cred->cr_uid) 211 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 212 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 213 214 /* 215 * Ignore append permission for regular files; use write 216 * permission instead. 217 */ 218 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 219 access_mask &= ~ACL_APPEND_DATA; 220 access_mask |= ACL_WRITE_DATA; 221 } 222 223 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 224 &explicitly_denied); 225 226 if (must_be_owner) { 227 if (file_uid != cred->cr_uid) 228 denied = EPERM; 229 } 230 231 /* 232 * For VEXEC, ensure that at least one execute bit is set for 233 * non-directories. We have to check the mode here to stay 234 * consistent with execve(2). See the test in 235 * exec_check_permissions(). 236 */ 237 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 238 if (!denied && !is_directory && (accmode & VEXEC) && 239 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 240 denied = EACCES; 241 242 if (!denied) 243 return (0); 244 245 /* 246 * Access failed. Iff it was not denied explicitly and 247 * VEXPLICIT_DENY flag was specified, allow access. 248 */ 249 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 250 return (0); 251 252 accmode &= ~VEXPLICIT_DENY; 253 254 /* 255 * No match. Try to use privileges, if there are any. 256 */ 257 if (is_directory) { 258 if ((accmode & VEXEC) && !priv_check_cred(cred, 259 PRIV_VFS_LOOKUP, 0)) 260 priv_granted |= VEXEC; 261 } else { 262 /* 263 * Ensure that at least one execute bit is on. Otherwise, 264 * a privileged user will always succeed, and we don't want 265 * this to happen unless the file really is executable. 266 */ 267 if ((accmode & VEXEC) && (file_mode & 268 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 269 !priv_check_cred(cred, PRIV_VFS_EXEC, 0)) 270 priv_granted |= VEXEC; 271 } 272 273 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 274 priv_granted |= VREAD; 275 276 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 277 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 278 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 279 280 if ((accmode & VADMIN_PERMS) && 281 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 282 priv_granted |= VADMIN_PERMS; 283 284 if ((accmode & VSTAT_PERMS) && 285 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 286 priv_granted |= VSTAT_PERMS; 287 288 if ((accmode & priv_granted) == accmode) { 289 if (privused != NULL) 290 *privused = 1; 291 292 return (0); 293 } 294 295 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 296 denied = EPERM; 297 else 298 denied = EACCES; 299 300 return (denied); 301 } 302 #endif /* _KERNEL */ 303 304 static int 305 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 306 acl_entry_type_t entry_type) 307 { 308 if (entry->ae_tag != tag) 309 return (0); 310 311 if (entry->ae_id != ACL_UNDEFINED_ID) 312 return (0); 313 314 if (entry->ae_perm != perm) 315 return (0); 316 317 if (entry->ae_entry_type != entry_type) 318 return (0); 319 320 if (entry->ae_flags != 0) 321 return (0); 322 323 return (1); 324 } 325 326 static struct acl_entry * 327 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 328 acl_entry_type_t entry_type) 329 { 330 struct acl_entry *entry; 331 332 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 333 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 334 335 entry = &(aclp->acl_entry[aclp->acl_cnt]); 336 aclp->acl_cnt++; 337 338 entry->ae_tag = tag; 339 entry->ae_id = ACL_UNDEFINED_ID; 340 entry->ae_perm = perm; 341 entry->ae_entry_type = entry_type; 342 entry->ae_flags = 0; 343 344 return (entry); 345 } 346 347 static struct acl_entry * 348 _acl_duplicate_entry(struct acl *aclp, int entry_index) 349 { 350 int i; 351 352 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 353 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 354 355 for (i = aclp->acl_cnt; i > entry_index; i--) 356 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 357 358 aclp->acl_cnt++; 359 360 return (&(aclp->acl_entry[entry_index + 1])); 361 } 362 363 static void 364 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 365 int file_owner_id) 366 { 367 int i, meets, must_append; 368 struct acl_entry *entry, *copy, *previous, 369 *a1, *a2, *a3, *a4, *a5, *a6; 370 mode_t amode; 371 const int READ = 04; 372 const int WRITE = 02; 373 const int EXEC = 01; 374 375 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 376 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 377 378 /* 379 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 380 * 381 * 3.16.6.3. Applying a Mode to an Existing ACL 382 */ 383 384 /* 385 * 1. For each ACE: 386 */ 387 for (i = 0; i < aclp->acl_cnt; i++) { 388 entry = &(aclp->acl_entry[i]); 389 390 /* 391 * 1.1. If the type is neither ALLOW or DENY - skip. 392 */ 393 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 394 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 395 continue; 396 397 /* 398 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 399 */ 400 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 401 continue; 402 403 /* 404 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 405 * are set: 406 */ 407 if (entry->ae_flags & 408 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 409 /* 410 * 1.3.1. A copy of the current ACE is made, and placed 411 * in the ACL immediately following the current 412 * ACE. 413 */ 414 copy = _acl_duplicate_entry(aclp, i); 415 416 /* 417 * 1.3.2. In the first ACE, the flag 418 * ACL_ENTRY_INHERIT_ONLY is set. 419 */ 420 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 421 422 /* 423 * 1.3.3. In the second ACE, the following flags 424 * are cleared: 425 * ACL_ENTRY_FILE_INHERIT, 426 * ACL_ENTRY_DIRECTORY_INHERIT, 427 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 428 */ 429 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 430 ACL_ENTRY_DIRECTORY_INHERIT | 431 ACL_ENTRY_NO_PROPAGATE_INHERIT); 432 433 /* 434 * The algorithm continues on with the second ACE. 435 */ 436 i++; 437 entry = copy; 438 } 439 440 /* 441 * 1.4. If it's owner@, group@ or everyone@ entry, clear 442 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 443 * and ACL_EXECUTE. Continue to the next entry. 444 */ 445 if (entry->ae_tag == ACL_USER_OBJ || 446 entry->ae_tag == ACL_GROUP_OBJ || 447 entry->ae_tag == ACL_EVERYONE) { 448 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 449 ACL_APPEND_DATA | ACL_EXECUTE); 450 continue; 451 } 452 453 /* 454 * 1.5. Otherwise, if the "who" field did not match one 455 * of OWNER@, GROUP@, EVERYONE@: 456 * 457 * 1.5.1. If the type is ALLOW, check the preceding ACE. 458 * If it does not meet all of the following criteria: 459 */ 460 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 461 continue; 462 463 meets = 0; 464 if (i > 0) { 465 meets = 1; 466 previous = &(aclp->acl_entry[i - 1]); 467 468 /* 469 * 1.5.1.1. The type field is DENY, 470 */ 471 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 472 meets = 0; 473 474 /* 475 * 1.5.1.2. The "who" field is the same as the current 476 * ACE, 477 * 478 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 479 * is the same as it is in the current ACE, 480 * and no other flag bits are set, 481 */ 482 if (previous->ae_id != entry->ae_id || 483 previous->ae_tag != entry->ae_tag) 484 meets = 0; 485 486 if (previous->ae_flags) 487 meets = 0; 488 489 /* 490 * 1.5.1.4. The mask bits are a subset of the mask bits 491 * of the current ACE, and are also subset of 492 * the following: ACL_READ_DATA, 493 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 494 */ 495 if (previous->ae_perm & ~(entry->ae_perm)) 496 meets = 0; 497 498 if (previous->ae_perm & ~(ACL_READ_DATA | 499 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 500 meets = 0; 501 } 502 503 if (!meets) { 504 /* 505 * Then the ACE of type DENY, with a who equal 506 * to the current ACE, flag bits equal to 507 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 508 * and no mask bits, is prepended. 509 */ 510 previous = entry; 511 entry = _acl_duplicate_entry(aclp, i); 512 513 /* Adjust counter, as we've just added an entry. */ 514 i++; 515 516 previous->ae_tag = entry->ae_tag; 517 previous->ae_id = entry->ae_id; 518 previous->ae_flags = entry->ae_flags; 519 previous->ae_perm = 0; 520 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 521 } 522 523 /* 524 * 1.5.2. The following modifications are made to the prepended 525 * ACE. The intent is to mask the following ACE 526 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 527 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 528 * permissions of the new mode. As a special case, 529 * if the ACE matches the current owner of the file, 530 * the owner bits are used, rather than the group bits. 531 * This is reflected in the algorithm below. 532 */ 533 amode = mode >> 3; 534 535 /* 536 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 537 * in ACE matches the owner of the file, we shift amode three 538 * more bits, in order to have the owner permission bits 539 * placed in the three low order bits of amode. 540 */ 541 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 542 amode = amode >> 3; 543 544 if (entry->ae_perm & ACL_READ_DATA) { 545 if (amode & READ) 546 previous->ae_perm &= ~ACL_READ_DATA; 547 else 548 previous->ae_perm |= ACL_READ_DATA; 549 } 550 551 if (entry->ae_perm & ACL_WRITE_DATA) { 552 if (amode & WRITE) 553 previous->ae_perm &= ~ACL_WRITE_DATA; 554 else 555 previous->ae_perm |= ACL_WRITE_DATA; 556 } 557 558 if (entry->ae_perm & ACL_APPEND_DATA) { 559 if (amode & WRITE) 560 previous->ae_perm &= ~ACL_APPEND_DATA; 561 else 562 previous->ae_perm |= ACL_APPEND_DATA; 563 } 564 565 if (entry->ae_perm & ACL_EXECUTE) { 566 if (amode & EXEC) 567 previous->ae_perm &= ~ACL_EXECUTE; 568 else 569 previous->ae_perm |= ACL_EXECUTE; 570 } 571 572 /* 573 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 574 * of the ALLOW ace: 575 * 576 * XXX: This point is not there in the Falkner's draft. 577 */ 578 if (entry->ae_tag == ACL_GROUP && 579 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 580 mode_t extramode, ownermode; 581 extramode = (mode >> 3) & 07; 582 ownermode = mode >> 6; 583 extramode &= ~ownermode; 584 585 if (extramode) { 586 if (extramode & READ) { 587 entry->ae_perm &= ~ACL_READ_DATA; 588 previous->ae_perm &= ~ACL_READ_DATA; 589 } 590 591 if (extramode & WRITE) { 592 entry->ae_perm &= 593 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 594 previous->ae_perm &= 595 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 596 } 597 598 if (extramode & EXEC) { 599 entry->ae_perm &= ~ACL_EXECUTE; 600 previous->ae_perm &= ~ACL_EXECUTE; 601 } 602 } 603 } 604 } 605 606 /* 607 * 2. If there at least six ACEs, the final six ACEs are examined. 608 * If they are not equal to what we want, append six ACEs. 609 */ 610 must_append = 0; 611 if (aclp->acl_cnt < 6) { 612 must_append = 1; 613 } else { 614 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 615 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 616 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 617 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 618 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 619 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 620 621 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 622 ACL_ENTRY_TYPE_DENY)) 623 must_append = 1; 624 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 625 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 626 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 627 must_append = 1; 628 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 629 ACL_ENTRY_TYPE_DENY)) 630 must_append = 1; 631 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 632 ACL_ENTRY_TYPE_ALLOW)) 633 must_append = 1; 634 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 635 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 636 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 637 must_append = 1; 638 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 639 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 640 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 641 must_append = 1; 642 } 643 644 if (must_append) { 645 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 646 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 647 648 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 649 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 650 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 651 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 652 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 653 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 654 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 655 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 656 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 657 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 658 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 659 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 660 661 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 662 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 663 } 664 665 /* 666 * 3. The final six ACEs are adjusted according to the incoming mode. 667 */ 668 if (mode & S_IRUSR) 669 a2->ae_perm |= ACL_READ_DATA; 670 else 671 a1->ae_perm |= ACL_READ_DATA; 672 if (mode & S_IWUSR) 673 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 674 else 675 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 676 if (mode & S_IXUSR) 677 a2->ae_perm |= ACL_EXECUTE; 678 else 679 a1->ae_perm |= ACL_EXECUTE; 680 681 if (mode & S_IRGRP) 682 a4->ae_perm |= ACL_READ_DATA; 683 else 684 a3->ae_perm |= ACL_READ_DATA; 685 if (mode & S_IWGRP) 686 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 687 else 688 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 689 if (mode & S_IXGRP) 690 a4->ae_perm |= ACL_EXECUTE; 691 else 692 a3->ae_perm |= ACL_EXECUTE; 693 694 if (mode & S_IROTH) 695 a6->ae_perm |= ACL_READ_DATA; 696 else 697 a5->ae_perm |= ACL_READ_DATA; 698 if (mode & S_IWOTH) 699 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 700 else 701 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 702 if (mode & S_IXOTH) 703 a6->ae_perm |= ACL_EXECUTE; 704 else 705 a5->ae_perm |= ACL_EXECUTE; 706 } 707 708 #ifdef _KERNEL 709 void 710 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 711 int file_owner_id) 712 { 713 714 if (acl_nfs4_old_semantics) 715 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 716 else 717 acl_nfs4_trivial_from_mode(aclp, mode); 718 } 719 #endif /* _KERNEL */ 720 721 void 722 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 723 { 724 int i; 725 mode_t old_mode = *_mode, mode = 0, seen = 0; 726 const struct acl_entry *entry; 727 728 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 729 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 730 731 /* 732 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 733 * 734 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 735 */ 736 737 for (i = 0; i < aclp->acl_cnt; i++) { 738 entry = &(aclp->acl_entry[i]); 739 740 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 741 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 742 continue; 743 744 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 745 continue; 746 747 if (entry->ae_tag == ACL_USER_OBJ) { 748 if ((entry->ae_perm & ACL_READ_DATA) && 749 ((seen & S_IRUSR) == 0)) { 750 seen |= S_IRUSR; 751 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 752 mode |= S_IRUSR; 753 } 754 if ((entry->ae_perm & ACL_WRITE_DATA) && 755 ((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 ((entry->ae_perm & ACL_EXECUTE) && 761 ((seen & S_IXUSR) == 0)) { 762 seen |= S_IXUSR; 763 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 764 mode |= S_IXUSR; 765 } 766 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 767 if ((entry->ae_perm & ACL_READ_DATA) && 768 ((seen & S_IRGRP) == 0)) { 769 seen |= S_IRGRP; 770 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 771 mode |= S_IRGRP; 772 } 773 if ((entry->ae_perm & ACL_WRITE_DATA) && 774 ((seen & S_IWGRP) == 0)) { 775 seen |= S_IWGRP; 776 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 777 mode |= S_IWGRP; 778 } 779 if ((entry->ae_perm & ACL_EXECUTE) && 780 ((seen & S_IXGRP) == 0)) { 781 seen |= S_IXGRP; 782 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 783 mode |= S_IXGRP; 784 } 785 } else if (entry->ae_tag == ACL_EVERYONE) { 786 if (entry->ae_perm & ACL_READ_DATA) { 787 if ((seen & S_IRUSR) == 0) { 788 seen |= S_IRUSR; 789 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 790 mode |= S_IRUSR; 791 } 792 if ((seen & S_IRGRP) == 0) { 793 seen |= S_IRGRP; 794 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 795 mode |= S_IRGRP; 796 } 797 if ((seen & S_IROTH) == 0) { 798 seen |= S_IROTH; 799 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 800 mode |= S_IROTH; 801 } 802 } 803 if (entry->ae_perm & ACL_WRITE_DATA) { 804 if ((seen & S_IWUSR) == 0) { 805 seen |= S_IWUSR; 806 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 807 mode |= S_IWUSR; 808 } 809 if ((seen & S_IWGRP) == 0) { 810 seen |= S_IWGRP; 811 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 812 mode |= S_IWGRP; 813 } 814 if ((seen & S_IWOTH) == 0) { 815 seen |= S_IWOTH; 816 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 817 mode |= S_IWOTH; 818 } 819 } 820 if (entry->ae_perm & ACL_EXECUTE) { 821 if ((seen & S_IXUSR) == 0) { 822 seen |= S_IXUSR; 823 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 824 mode |= S_IXUSR; 825 } 826 if ((seen & S_IXGRP) == 0) { 827 seen |= S_IXGRP; 828 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 829 mode |= S_IXGRP; 830 } 831 if ((seen & S_IXOTH) == 0) { 832 seen |= S_IXOTH; 833 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 834 mode |= S_IXOTH; 835 } 836 } 837 } 838 } 839 840 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 841 } 842 843 #ifdef _KERNEL 844 /* 845 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 846 * draft-ietf-nfsv4-minorversion1-03.txt. 847 */ 848 static void 849 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 850 struct acl *child_aclp, mode_t mode, int file_owner_id, 851 int is_directory) 852 { 853 int i, flags; 854 const struct acl_entry *parent_entry; 855 struct acl_entry *entry, *copy; 856 857 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 858 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 859 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 860 861 /* 862 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 863 * 864 * 3.16.6.2. Applying the mode given to CREATE or OPEN 865 * to an inherited ACL 866 */ 867 868 /* 869 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 870 */ 871 for (i = 0; i < parent_aclp->acl_cnt; i++) { 872 parent_entry = &(parent_aclp->acl_entry[i]); 873 flags = parent_entry->ae_flags; 874 875 /* 876 * Entry is not inheritable at all. 877 */ 878 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 879 ACL_ENTRY_FILE_INHERIT)) == 0) 880 continue; 881 882 /* 883 * We're creating a file, but entry is not inheritable 884 * by files. 885 */ 886 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 887 continue; 888 889 /* 890 * Entry is inheritable only by files, but has NO_PROPAGATE 891 * flag set, and we're creating a directory, so it wouldn't 892 * propagate to any file in that directory anyway. 893 */ 894 if (is_directory && 895 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 896 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 897 continue; 898 899 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 900 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 901 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 902 child_aclp->acl_cnt++; 903 } 904 905 /* 906 * 2. For each entry in the new ACL, adjust its flags, possibly 907 * creating two entries in place of one. 908 */ 909 for (i = 0; i < child_aclp->acl_cnt; i++) { 910 entry = &(child_aclp->acl_entry[i]); 911 912 /* 913 * This is not in the specification, but SunOS 914 * apparently does that. 915 */ 916 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 917 !is_directory) && 918 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 919 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 920 921 /* 922 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 923 * being created is not a directory, then clear the 924 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 925 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 926 * ACL_ENTRY_INHERIT_ONLY. 927 */ 928 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 929 !is_directory) { 930 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 931 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 932 ACL_ENTRY_INHERIT_ONLY); 933 934 /* 935 * Continue on to the next ACE. 936 */ 937 continue; 938 } 939 940 /* 941 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 942 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 943 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 944 * next ACE. Otherwise... 945 */ 946 /* 947 * XXX: Read it again and make sure what does the "otherwise" 948 * apply to. 949 */ 950 if (is_directory && 951 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 952 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 953 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 954 continue; 955 } 956 957 /* 958 * 2.C. If the type of the ACE is neither ALLOW nor deny, 959 * then continue. 960 */ 961 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 962 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 963 continue; 964 965 /* 966 * 2.D. Copy the original ACE into a second, adjacent ACE. 967 */ 968 copy = _acl_duplicate_entry(child_aclp, i); 969 970 /* 971 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 972 * is set. 973 */ 974 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 975 976 /* 977 * 2.F. On the second ACE, clear the following flags: 978 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 979 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 980 */ 981 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 982 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 983 ACL_ENTRY_INHERIT_ONLY); 984 985 /* 986 * 2.G. On the second ACE, if the type is ALLOW, 987 * an implementation MAY clear the following 988 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 989 */ 990 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 991 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 992 993 /* 994 * Increment the counter to skip the copied entry. 995 */ 996 i++; 997 } 998 999 /* 1000 * 3. To ensure that the mode is honored, apply the algorithm describe 1001 * in Section 2.16.6.3, using the mode that is to be used for file 1002 * creation. 1003 */ 1004 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1005 } 1006 #endif /* _KERNEL */ 1007 1008 /* 1009 * Populate the ACL with entries inherited from parent_aclp. 1010 */ 1011 static void 1012 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1013 struct acl *child_aclp, mode_t mode, int file_owner_id, 1014 int is_directory) 1015 { 1016 int i, flags, tag; 1017 const struct acl_entry *parent_entry; 1018 struct acl_entry *entry; 1019 1020 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1021 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1022 1023 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1024 parent_entry = &(parent_aclp->acl_entry[i]); 1025 flags = parent_entry->ae_flags; 1026 tag = parent_entry->ae_tag; 1027 1028 /* 1029 * Don't inherit owner@, group@, or everyone@ entries. 1030 */ 1031 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1032 tag == ACL_EVERYONE) 1033 continue; 1034 1035 /* 1036 * Entry is not inheritable at all. 1037 */ 1038 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1039 ACL_ENTRY_FILE_INHERIT)) == 0) 1040 continue; 1041 1042 /* 1043 * We're creating a file, but entry is not inheritable 1044 * by files. 1045 */ 1046 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1047 continue; 1048 1049 /* 1050 * Entry is inheritable only by files, but has NO_PROPAGATE 1051 * flag set, and we're creating a directory, so it wouldn't 1052 * propagate to any file in that directory anyway. 1053 */ 1054 if (is_directory && 1055 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1056 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1057 continue; 1058 1059 /* 1060 * Entry qualifies for being inherited. 1061 */ 1062 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1063 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1064 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1065 *entry = *parent_entry; 1066 child_aclp->acl_cnt++; 1067 1068 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1069 1070 /* 1071 * If the type of the ACE is neither ALLOW nor DENY, 1072 * then leave it as it is and proceed to the next one. 1073 */ 1074 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1075 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1076 continue; 1077 1078 /* 1079 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1080 * the object being created is not a directory, then clear 1081 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1082 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1083 * ACL_ENTRY_INHERIT_ONLY. 1084 */ 1085 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1086 !is_directory) { 1087 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1088 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1089 ACL_ENTRY_INHERIT_ONLY); 1090 } 1091 1092 /* 1093 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1094 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1095 * that ACL_ENTRY_INHERIT_ONLY is set. 1096 */ 1097 if (is_directory && 1098 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1099 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1100 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1101 } 1102 1103 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1104 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1105 /* 1106 * Some permissions must never be inherited. 1107 */ 1108 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1109 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1110 1111 /* 1112 * Others must be masked according to the file mode. 1113 */ 1114 if ((mode & S_IRGRP) == 0) 1115 entry->ae_perm &= ~ACL_READ_DATA; 1116 if ((mode & S_IWGRP) == 0) 1117 entry->ae_perm &= 1118 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1119 if ((mode & S_IXGRP) == 0) 1120 entry->ae_perm &= ~ACL_EXECUTE; 1121 } 1122 } 1123 } 1124 1125 /* 1126 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1127 * It's also being used to calculate a trivial ACL, by inheriting from 1128 * a NULL ACL. 1129 */ 1130 static void 1131 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1132 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1133 { 1134 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1135 acl_perm_t user_allow, group_allow, everyone_allow; 1136 1137 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1138 1139 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1140 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1141 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1142 ACL_WRITE_NAMED_ATTRS; 1143 1144 if (mode & S_IRUSR) 1145 user_allow |= ACL_READ_DATA; 1146 if (mode & S_IWUSR) 1147 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1148 if (mode & S_IXUSR) 1149 user_allow |= ACL_EXECUTE; 1150 1151 if (mode & S_IRGRP) 1152 group_allow |= ACL_READ_DATA; 1153 if (mode & S_IWGRP) 1154 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1155 if (mode & S_IXGRP) 1156 group_allow |= ACL_EXECUTE; 1157 1158 if (mode & S_IROTH) 1159 everyone_allow |= ACL_READ_DATA; 1160 if (mode & S_IWOTH) 1161 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1162 if (mode & S_IXOTH) 1163 everyone_allow |= ACL_EXECUTE; 1164 1165 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1166 group_deny = everyone_allow & ~group_allow; 1167 user_allow_first = group_deny & ~user_deny; 1168 1169 if (user_allow_first != 0) 1170 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1171 ACL_ENTRY_TYPE_ALLOW); 1172 if (user_deny != 0) 1173 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1174 ACL_ENTRY_TYPE_DENY); 1175 if (group_deny != 0) 1176 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1177 ACL_ENTRY_TYPE_DENY); 1178 1179 if (parent_aclp != NULL) 1180 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1181 file_owner_id, is_directory); 1182 1183 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1184 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1185 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1186 } 1187 1188 #ifdef _KERNEL 1189 void 1190 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1191 struct acl *child_aclp, mode_t mode, int file_owner_id, 1192 int is_directory) 1193 { 1194 1195 if (acl_nfs4_old_semantics) 1196 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1197 mode, file_owner_id, is_directory); 1198 else 1199 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1200 mode, file_owner_id, is_directory); 1201 } 1202 #endif /* _KERNEL */ 1203 1204 /* 1205 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1206 * Note that this results in an ACL different from (but semantically 1207 * equal to) the "canonical six" trivial ACL computed using algorithm 1208 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1209 */ 1210 static void 1211 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1212 { 1213 1214 aclp->acl_cnt = 0; 1215 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1216 } 1217 1218 #ifndef _KERNEL 1219 /* 1220 * This routine is used by libc to implement acl_strip_np(3) 1221 * and acl_is_trivial_np(3). 1222 */ 1223 void 1224 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1225 { 1226 1227 aclp->acl_cnt = 0; 1228 if (canonical_six) 1229 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1230 else 1231 acl_nfs4_trivial_from_mode(aclp, mode); 1232 } 1233 #endif /* !_KERNEL */ 1234 1235 #ifdef _KERNEL 1236 static int 1237 _acls_are_equal(const struct acl *a, const struct acl *b) 1238 { 1239 int i; 1240 const struct acl_entry *entrya, *entryb; 1241 1242 if (a->acl_cnt != b->acl_cnt) 1243 return (0); 1244 1245 for (i = 0; i < b->acl_cnt; i++) { 1246 entrya = &(a->acl_entry[i]); 1247 entryb = &(b->acl_entry[i]); 1248 1249 if (entrya->ae_tag != entryb->ae_tag || 1250 entrya->ae_id != entryb->ae_id || 1251 entrya->ae_perm != entryb->ae_perm || 1252 entrya->ae_entry_type != entryb->ae_entry_type || 1253 entrya->ae_flags != entryb->ae_flags) 1254 return (0); 1255 } 1256 1257 return (1); 1258 } 1259 1260 /* 1261 * This routine is used to determine whether to remove extended attribute 1262 * that stores ACL contents. 1263 */ 1264 int 1265 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1266 { 1267 int trivial; 1268 mode_t tmpmode = 0; 1269 struct acl *tmpaclp; 1270 1271 if (aclp->acl_cnt > 6) 1272 return (0); 1273 1274 /* 1275 * Compute the mode from the ACL, then compute new ACL from that mode. 1276 * If the ACLs are identical, then the ACL is trivial. 1277 * 1278 * XXX: I guess there is a faster way to do this. However, even 1279 * this slow implementation significantly speeds things up 1280 * for files that don't have non-trivial ACLs - it's critical 1281 * for performance to not use EA when they are not needed. 1282 * 1283 * First try the PSARC/2010/029 semantics. 1284 */ 1285 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1286 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1287 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1288 trivial = _acls_are_equal(aclp, tmpaclp); 1289 if (trivial) { 1290 acl_free(tmpaclp); 1291 return (trivial); 1292 } 1293 1294 /* 1295 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1296 */ 1297 tmpaclp->acl_cnt = 0; 1298 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1299 trivial = _acls_are_equal(aclp, tmpaclp); 1300 acl_free(tmpaclp); 1301 1302 return (trivial); 1303 } 1304 #endif /* _KERNEL */ 1305 1306 int 1307 acl_nfs4_check(const struct acl *aclp, int is_directory) 1308 { 1309 int i; 1310 const struct acl_entry *entry; 1311 1312 /* 1313 * The spec doesn't seem to say anything about ACL validity. 1314 * It seems there is not much to do here. There is even no need 1315 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1316 * entries, as there can be several of them and that's perfectly 1317 * valid. There can be none of them too. Really. 1318 */ 1319 1320 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1321 return (EINVAL); 1322 1323 for (i = 0; i < aclp->acl_cnt; i++) { 1324 entry = &(aclp->acl_entry[i]); 1325 1326 switch (entry->ae_tag) { 1327 case ACL_USER_OBJ: 1328 case ACL_GROUP_OBJ: 1329 case ACL_EVERYONE: 1330 if (entry->ae_id != ACL_UNDEFINED_ID) 1331 return (EINVAL); 1332 break; 1333 1334 case ACL_USER: 1335 case ACL_GROUP: 1336 if (entry->ae_id == ACL_UNDEFINED_ID) 1337 return (EINVAL); 1338 break; 1339 1340 default: 1341 return (EINVAL); 1342 } 1343 1344 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1345 return (EINVAL); 1346 1347 /* 1348 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1349 */ 1350 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1351 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1352 return (EINVAL); 1353 1354 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1355 return (EINVAL); 1356 1357 /* Disallow unimplemented flags. */ 1358 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1359 ACL_ENTRY_FAILED_ACCESS)) 1360 return (EINVAL); 1361 1362 /* Disallow flags not allowed for ordinary files. */ 1363 if (!is_directory) { 1364 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1365 ACL_ENTRY_DIRECTORY_INHERIT | 1366 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1367 return (EINVAL); 1368 } 1369 } 1370 1371 return (0); 1372 }
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