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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: releng/9.0/sys/kern/subr_acl_nfs4.c 219880 2011-03-22 19:52:29Z 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/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 > 0, ("aclp->acl_cnt > 0")); 118 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 119 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 120 121 for (i = 0; i < aclp->acl_cnt; i++) { 122 entry = &(aclp->acl_entry[i]); 123 124 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 125 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 126 continue; 127 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 128 continue; 129 switch (entry->ae_tag) { 130 case ACL_USER_OBJ: 131 if (file_uid != cred->cr_uid) 132 continue; 133 break; 134 case ACL_USER: 135 if (entry->ae_id != cred->cr_uid) 136 continue; 137 break; 138 case ACL_GROUP_OBJ: 139 if (!groupmember(file_gid, cred)) 140 continue; 141 break; 142 case ACL_GROUP: 143 if (!groupmember(entry->ae_id, cred)) 144 continue; 145 break; 146 default: 147 KASSERT(entry->ae_tag == ACL_EVERYONE, 148 ("entry->ae_tag == ACL_EVERYONE")); 149 } 150 151 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 152 if (entry->ae_perm & access_mask) { 153 if (denied_explicitly != NULL) 154 *denied_explicitly = 1; 155 return (1); 156 } 157 } 158 159 access_mask &= ~(entry->ae_perm); 160 if (access_mask == 0) 161 return (0); 162 } 163 164 return (1); 165 } 166 167 int 168 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 169 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 170 { 171 accmode_t priv_granted = 0; 172 int denied, explicitly_denied, access_mask, is_directory, 173 must_be_owner = 0; 174 mode_t file_mode = 0; 175 176 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 177 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 178 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 179 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 180 ("invalid bit in accmode")); 181 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 182 ("VAPPEND without VWRITE")); 183 184 if (privused != NULL) 185 *privused = 0; 186 187 if (accmode & VADMIN) 188 must_be_owner = 1; 189 190 /* 191 * Ignore VSYNCHRONIZE permission. 192 */ 193 accmode &= ~VSYNCHRONIZE; 194 195 access_mask = _access_mask_from_accmode(accmode); 196 197 if (type == VDIR) 198 is_directory = 1; 199 else 200 is_directory = 0; 201 202 /* 203 * File owner is always allowed to read and write the ACL 204 * and basic attributes. This is to prevent a situation 205 * where user would change ACL in a way that prevents him 206 * from undoing the change. 207 */ 208 if (file_uid == cred->cr_uid) 209 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 210 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 211 212 /* 213 * Ignore append permission for regular files; use write 214 * permission instead. 215 */ 216 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 217 access_mask &= ~ACL_APPEND_DATA; 218 access_mask |= ACL_WRITE_DATA; 219 } 220 221 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 222 &explicitly_denied); 223 224 if (must_be_owner) { 225 if (file_uid != cred->cr_uid) 226 denied = EPERM; 227 } 228 229 /* 230 * For VEXEC, ensure that at least one execute bit is set for 231 * non-directories. We have to check the mode here to stay 232 * consistent with execve(2). See the test in 233 * exec_check_permissions(). 234 */ 235 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 236 if (!denied && !is_directory && (accmode & VEXEC) && 237 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 238 denied = EACCES; 239 240 if (!denied) 241 return (0); 242 243 /* 244 * Access failed. Iff it was not denied explicitly and 245 * VEXPLICIT_DENY flag was specified, allow access. 246 */ 247 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 248 return (0); 249 250 accmode &= ~VEXPLICIT_DENY; 251 252 /* 253 * No match. Try to use privileges, if there are any. 254 */ 255 if (is_directory) { 256 if ((accmode & VEXEC) && !priv_check_cred(cred, 257 PRIV_VFS_LOOKUP, 0)) 258 priv_granted |= VEXEC; 259 } else { 260 /* 261 * Ensure that at least one execute bit is on. Otherwise, 262 * a privileged user will always succeed, and we don't want 263 * this to happen unless the file really is executable. 264 */ 265 if ((accmode & VEXEC) && (file_mode & 266 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 267 !priv_check_cred(cred, PRIV_VFS_EXEC, 0)) 268 priv_granted |= VEXEC; 269 } 270 271 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0)) 272 priv_granted |= VREAD; 273 274 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 275 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 276 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 277 278 if ((accmode & VADMIN_PERMS) && 279 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 280 priv_granted |= VADMIN_PERMS; 281 282 if ((accmode & VSTAT_PERMS) && 283 !priv_check_cred(cred, PRIV_VFS_STAT, 0)) 284 priv_granted |= VSTAT_PERMS; 285 286 if ((accmode & priv_granted) == accmode) { 287 if (privused != NULL) 288 *privused = 1; 289 290 return (0); 291 } 292 293 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 294 denied = EPERM; 295 else 296 denied = EACCES; 297 298 return (denied); 299 } 300 #endif /* _KERNEL */ 301 302 static int 303 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 304 acl_entry_type_t entry_type) 305 { 306 if (entry->ae_tag != tag) 307 return (0); 308 309 if (entry->ae_id != ACL_UNDEFINED_ID) 310 return (0); 311 312 if (entry->ae_perm != perm) 313 return (0); 314 315 if (entry->ae_entry_type != entry_type) 316 return (0); 317 318 if (entry->ae_flags != 0) 319 return (0); 320 321 return (1); 322 } 323 324 static struct acl_entry * 325 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 326 acl_entry_type_t entry_type) 327 { 328 struct acl_entry *entry; 329 330 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 331 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 332 333 entry = &(aclp->acl_entry[aclp->acl_cnt]); 334 aclp->acl_cnt++; 335 336 entry->ae_tag = tag; 337 entry->ae_id = ACL_UNDEFINED_ID; 338 entry->ae_perm = perm; 339 entry->ae_entry_type = entry_type; 340 entry->ae_flags = 0; 341 342 return (entry); 343 } 344 345 static struct acl_entry * 346 _acl_duplicate_entry(struct acl *aclp, int entry_index) 347 { 348 int i; 349 350 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 351 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 352 353 for (i = aclp->acl_cnt; i > entry_index; i--) 354 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 355 356 aclp->acl_cnt++; 357 358 return (&(aclp->acl_entry[entry_index + 1])); 359 } 360 361 static void 362 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 363 int file_owner_id) 364 { 365 int i, meets, must_append; 366 struct acl_entry *entry, *copy, *previous, 367 *a1, *a2, *a3, *a4, *a5, *a6; 368 mode_t amode; 369 const int READ = 04; 370 const int WRITE = 02; 371 const int EXEC = 01; 372 373 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 374 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 375 376 /* 377 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 378 * 379 * 3.16.6.3. Applying a Mode to an Existing ACL 380 */ 381 382 /* 383 * 1. For each ACE: 384 */ 385 for (i = 0; i < aclp->acl_cnt; i++) { 386 entry = &(aclp->acl_entry[i]); 387 388 /* 389 * 1.1. If the type is neither ALLOW or DENY - skip. 390 */ 391 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 392 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 393 continue; 394 395 /* 396 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 397 */ 398 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 399 continue; 400 401 /* 402 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 403 * are set: 404 */ 405 if (entry->ae_flags & 406 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 407 /* 408 * 1.3.1. A copy of the current ACE is made, and placed 409 * in the ACL immediately following the current 410 * ACE. 411 */ 412 copy = _acl_duplicate_entry(aclp, i); 413 414 /* 415 * 1.3.2. In the first ACE, the flag 416 * ACL_ENTRY_INHERIT_ONLY is set. 417 */ 418 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 419 420 /* 421 * 1.3.3. In the second ACE, the following flags 422 * are cleared: 423 * ACL_ENTRY_FILE_INHERIT, 424 * ACL_ENTRY_DIRECTORY_INHERIT, 425 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 426 */ 427 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 428 ACL_ENTRY_DIRECTORY_INHERIT | 429 ACL_ENTRY_NO_PROPAGATE_INHERIT); 430 431 /* 432 * The algorithm continues on with the second ACE. 433 */ 434 i++; 435 entry = copy; 436 } 437 438 /* 439 * 1.4. If it's owner@, group@ or everyone@ entry, clear 440 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 441 * and ACL_EXECUTE. Continue to the next entry. 442 */ 443 if (entry->ae_tag == ACL_USER_OBJ || 444 entry->ae_tag == ACL_GROUP_OBJ || 445 entry->ae_tag == ACL_EVERYONE) { 446 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 447 ACL_APPEND_DATA | ACL_EXECUTE); 448 continue; 449 } 450 451 /* 452 * 1.5. Otherwise, if the "who" field did not match one 453 * of OWNER@, GROUP@, EVERYONE@: 454 * 455 * 1.5.1. If the type is ALLOW, check the preceding ACE. 456 * If it does not meet all of the following criteria: 457 */ 458 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 459 continue; 460 461 meets = 0; 462 if (i > 0) { 463 meets = 1; 464 previous = &(aclp->acl_entry[i - 1]); 465 466 /* 467 * 1.5.1.1. The type field is DENY, 468 */ 469 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 470 meets = 0; 471 472 /* 473 * 1.5.1.2. The "who" field is the same as the current 474 * ACE, 475 * 476 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 477 * is the same as it is in the current ACE, 478 * and no other flag bits are set, 479 */ 480 if (previous->ae_id != entry->ae_id || 481 previous->ae_tag != entry->ae_tag) 482 meets = 0; 483 484 if (previous->ae_flags) 485 meets = 0; 486 487 /* 488 * 1.5.1.4. The mask bits are a subset of the mask bits 489 * of the current ACE, and are also subset of 490 * the following: ACL_READ_DATA, 491 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 492 */ 493 if (previous->ae_perm & ~(entry->ae_perm)) 494 meets = 0; 495 496 if (previous->ae_perm & ~(ACL_READ_DATA | 497 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 498 meets = 0; 499 } 500 501 if (!meets) { 502 /* 503 * Then the ACE of type DENY, with a who equal 504 * to the current ACE, flag bits equal to 505 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 506 * and no mask bits, is prepended. 507 */ 508 previous = entry; 509 entry = _acl_duplicate_entry(aclp, i); 510 511 /* Adjust counter, as we've just added an entry. */ 512 i++; 513 514 previous->ae_tag = entry->ae_tag; 515 previous->ae_id = entry->ae_id; 516 previous->ae_flags = entry->ae_flags; 517 previous->ae_perm = 0; 518 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 519 } 520 521 /* 522 * 1.5.2. The following modifications are made to the prepended 523 * ACE. The intent is to mask the following ACE 524 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 525 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 526 * permissions of the new mode. As a special case, 527 * if the ACE matches the current owner of the file, 528 * the owner bits are used, rather than the group bits. 529 * This is reflected in the algorithm below. 530 */ 531 amode = mode >> 3; 532 533 /* 534 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 535 * in ACE matches the owner of the file, we shift amode three 536 * more bits, in order to have the owner permission bits 537 * placed in the three low order bits of amode. 538 */ 539 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 540 amode = amode >> 3; 541 542 if (entry->ae_perm & ACL_READ_DATA) { 543 if (amode & READ) 544 previous->ae_perm &= ~ACL_READ_DATA; 545 else 546 previous->ae_perm |= ACL_READ_DATA; 547 } 548 549 if (entry->ae_perm & ACL_WRITE_DATA) { 550 if (amode & WRITE) 551 previous->ae_perm &= ~ACL_WRITE_DATA; 552 else 553 previous->ae_perm |= ACL_WRITE_DATA; 554 } 555 556 if (entry->ae_perm & ACL_APPEND_DATA) { 557 if (amode & WRITE) 558 previous->ae_perm &= ~ACL_APPEND_DATA; 559 else 560 previous->ae_perm |= ACL_APPEND_DATA; 561 } 562 563 if (entry->ae_perm & ACL_EXECUTE) { 564 if (amode & EXEC) 565 previous->ae_perm &= ~ACL_EXECUTE; 566 else 567 previous->ae_perm |= ACL_EXECUTE; 568 } 569 570 /* 571 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 572 * of the ALLOW ace: 573 * 574 * XXX: This point is not there in the Falkner's draft. 575 */ 576 if (entry->ae_tag == ACL_GROUP && 577 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 578 mode_t extramode, ownermode; 579 extramode = (mode >> 3) & 07; 580 ownermode = mode >> 6; 581 extramode &= ~ownermode; 582 583 if (extramode) { 584 if (extramode & READ) { 585 entry->ae_perm &= ~ACL_READ_DATA; 586 previous->ae_perm &= ~ACL_READ_DATA; 587 } 588 589 if (extramode & WRITE) { 590 entry->ae_perm &= 591 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 592 previous->ae_perm &= 593 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 594 } 595 596 if (extramode & EXEC) { 597 entry->ae_perm &= ~ACL_EXECUTE; 598 previous->ae_perm &= ~ACL_EXECUTE; 599 } 600 } 601 } 602 } 603 604 /* 605 * 2. If there at least six ACEs, the final six ACEs are examined. 606 * If they are not equal to what we want, append six ACEs. 607 */ 608 must_append = 0; 609 if (aclp->acl_cnt < 6) { 610 must_append = 1; 611 } else { 612 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 613 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 614 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 615 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 616 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 617 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 618 619 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 620 ACL_ENTRY_TYPE_DENY)) 621 must_append = 1; 622 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 623 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 624 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 625 must_append = 1; 626 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 627 ACL_ENTRY_TYPE_DENY)) 628 must_append = 1; 629 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 630 ACL_ENTRY_TYPE_ALLOW)) 631 must_append = 1; 632 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 633 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 634 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 635 must_append = 1; 636 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 637 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 638 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 639 must_append = 1; 640 } 641 642 if (must_append) { 643 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 644 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 645 646 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 647 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 648 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 649 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 650 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 651 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 652 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 653 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 654 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 655 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 656 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 657 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 658 659 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 660 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 661 } 662 663 /* 664 * 3. The final six ACEs are adjusted according to the incoming mode. 665 */ 666 if (mode & S_IRUSR) 667 a2->ae_perm |= ACL_READ_DATA; 668 else 669 a1->ae_perm |= ACL_READ_DATA; 670 if (mode & S_IWUSR) 671 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 672 else 673 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 674 if (mode & S_IXUSR) 675 a2->ae_perm |= ACL_EXECUTE; 676 else 677 a1->ae_perm |= ACL_EXECUTE; 678 679 if (mode & S_IRGRP) 680 a4->ae_perm |= ACL_READ_DATA; 681 else 682 a3->ae_perm |= ACL_READ_DATA; 683 if (mode & S_IWGRP) 684 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 685 else 686 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 687 if (mode & S_IXGRP) 688 a4->ae_perm |= ACL_EXECUTE; 689 else 690 a3->ae_perm |= ACL_EXECUTE; 691 692 if (mode & S_IROTH) 693 a6->ae_perm |= ACL_READ_DATA; 694 else 695 a5->ae_perm |= ACL_READ_DATA; 696 if (mode & S_IWOTH) 697 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 698 else 699 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 700 if (mode & S_IXOTH) 701 a6->ae_perm |= ACL_EXECUTE; 702 else 703 a5->ae_perm |= ACL_EXECUTE; 704 } 705 706 #ifdef _KERNEL 707 void 708 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 709 int file_owner_id) 710 { 711 712 if (acl_nfs4_old_semantics) 713 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 714 else 715 acl_nfs4_trivial_from_mode(aclp, mode); 716 } 717 #endif /* _KERNEL */ 718 719 void 720 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 721 { 722 int i; 723 mode_t old_mode = *_mode, mode = 0, seen = 0; 724 const struct acl_entry *entry; 725 726 KASSERT(aclp->acl_cnt > 0, ("aclp->acl_cnt > 0")); 727 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 728 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 729 730 /* 731 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 732 * 733 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 734 */ 735 736 for (i = 0; i < aclp->acl_cnt; i++) { 737 entry = &(aclp->acl_entry[i]); 738 739 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 740 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 741 continue; 742 743 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 744 continue; 745 746 if (entry->ae_tag == ACL_USER_OBJ) { 747 if ((entry->ae_perm & ACL_READ_DATA) && 748 ((seen & S_IRUSR) == 0)) { 749 seen |= S_IRUSR; 750 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 751 mode |= S_IRUSR; 752 } 753 if ((entry->ae_perm & ACL_WRITE_DATA) && 754 ((seen & S_IWUSR) == 0)) { 755 seen |= S_IWUSR; 756 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 757 mode |= S_IWUSR; 758 } 759 if ((entry->ae_perm & ACL_EXECUTE) && 760 ((seen & S_IXUSR) == 0)) { 761 seen |= S_IXUSR; 762 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 763 mode |= S_IXUSR; 764 } 765 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 766 if ((entry->ae_perm & ACL_READ_DATA) && 767 ((seen & S_IRGRP) == 0)) { 768 seen |= S_IRGRP; 769 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 770 mode |= S_IRGRP; 771 } 772 if ((entry->ae_perm & ACL_WRITE_DATA) && 773 ((seen & S_IWGRP) == 0)) { 774 seen |= S_IWGRP; 775 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 776 mode |= S_IWGRP; 777 } 778 if ((entry->ae_perm & ACL_EXECUTE) && 779 ((seen & S_IXGRP) == 0)) { 780 seen |= S_IXGRP; 781 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 782 mode |= S_IXGRP; 783 } 784 } else if (entry->ae_tag == ACL_EVERYONE) { 785 if (entry->ae_perm & ACL_READ_DATA) { 786 if ((seen & S_IRUSR) == 0) { 787 seen |= S_IRUSR; 788 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 789 mode |= S_IRUSR; 790 } 791 if ((seen & S_IRGRP) == 0) { 792 seen |= S_IRGRP; 793 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 794 mode |= S_IRGRP; 795 } 796 if ((seen & S_IROTH) == 0) { 797 seen |= S_IROTH; 798 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 799 mode |= S_IROTH; 800 } 801 } 802 if (entry->ae_perm & ACL_WRITE_DATA) { 803 if ((seen & S_IWUSR) == 0) { 804 seen |= S_IWUSR; 805 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 806 mode |= S_IWUSR; 807 } 808 if ((seen & S_IWGRP) == 0) { 809 seen |= S_IWGRP; 810 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 811 mode |= S_IWGRP; 812 } 813 if ((seen & S_IWOTH) == 0) { 814 seen |= S_IWOTH; 815 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 816 mode |= S_IWOTH; 817 } 818 } 819 if (entry->ae_perm & ACL_EXECUTE) { 820 if ((seen & S_IXUSR) == 0) { 821 seen |= S_IXUSR; 822 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 823 mode |= S_IXUSR; 824 } 825 if ((seen & S_IXGRP) == 0) { 826 seen |= S_IXGRP; 827 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 828 mode |= S_IXGRP; 829 } 830 if ((seen & S_IXOTH) == 0) { 831 seen |= S_IXOTH; 832 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 833 mode |= S_IXOTH; 834 } 835 } 836 } 837 } 838 839 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 840 } 841 842 #ifdef _KERNEL 843 /* 844 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 845 * draft-ietf-nfsv4-minorversion1-03.txt. 846 */ 847 static void 848 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 849 struct acl *child_aclp, mode_t mode, int file_owner_id, 850 int is_directory) 851 { 852 int i, flags; 853 const struct acl_entry *parent_entry; 854 struct acl_entry *entry, *copy; 855 856 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 857 KASSERT(parent_aclp->acl_cnt > 0, ("parent_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 > 0, ("parent_aclp->acl_cnt > 0")); 1021 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1022 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1023 1024 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1025 parent_entry = &(parent_aclp->acl_entry[i]); 1026 flags = parent_entry->ae_flags; 1027 tag = parent_entry->ae_tag; 1028 1029 /* 1030 * Don't inherit owner@, group@, or everyone@ entries. 1031 */ 1032 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1033 tag == ACL_EVERYONE) 1034 continue; 1035 1036 /* 1037 * Entry is not inheritable at all. 1038 */ 1039 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1040 ACL_ENTRY_FILE_INHERIT)) == 0) 1041 continue; 1042 1043 /* 1044 * We're creating a file, but entry is not inheritable 1045 * by files. 1046 */ 1047 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1048 continue; 1049 1050 /* 1051 * Entry is inheritable only by files, but has NO_PROPAGATE 1052 * flag set, and we're creating a directory, so it wouldn't 1053 * propagate to any file in that directory anyway. 1054 */ 1055 if (is_directory && 1056 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1057 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1058 continue; 1059 1060 /* 1061 * Entry qualifies for being inherited. 1062 */ 1063 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1064 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1065 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1066 *entry = *parent_entry; 1067 child_aclp->acl_cnt++; 1068 1069 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1070 1071 /* 1072 * If the type of the ACE is neither ALLOW nor DENY, 1073 * then leave it as it is and proceed to the next one. 1074 */ 1075 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1076 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1077 continue; 1078 1079 /* 1080 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1081 * the object being created is not a directory, then clear 1082 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1083 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1084 * ACL_ENTRY_INHERIT_ONLY. 1085 */ 1086 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1087 !is_directory) { 1088 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1089 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1090 ACL_ENTRY_INHERIT_ONLY); 1091 } 1092 1093 /* 1094 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1095 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1096 * that ACL_ENTRY_INHERIT_ONLY is set. 1097 */ 1098 if (is_directory && 1099 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1100 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1101 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1102 } 1103 1104 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1105 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1106 /* 1107 * Some permissions must never be inherited. 1108 */ 1109 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1110 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1111 1112 /* 1113 * Others must be masked according to the file mode. 1114 */ 1115 if ((mode & S_IRGRP) == 0) 1116 entry->ae_perm &= ~ACL_READ_DATA; 1117 if ((mode & S_IWGRP) == 0) 1118 entry->ae_perm &= 1119 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1120 if ((mode & S_IXGRP) == 0) 1121 entry->ae_perm &= ~ACL_EXECUTE; 1122 } 1123 } 1124 } 1125 1126 /* 1127 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1128 * It's also being used to calculate a trivial ACL, by inheriting from 1129 * a NULL ACL. 1130 */ 1131 static void 1132 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1133 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1134 { 1135 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1136 acl_perm_t user_allow, group_allow, everyone_allow; 1137 1138 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1139 1140 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1141 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1142 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1143 ACL_WRITE_NAMED_ATTRS; 1144 1145 if (mode & S_IRUSR) 1146 user_allow |= ACL_READ_DATA; 1147 if (mode & S_IWUSR) 1148 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1149 if (mode & S_IXUSR) 1150 user_allow |= ACL_EXECUTE; 1151 1152 if (mode & S_IRGRP) 1153 group_allow |= ACL_READ_DATA; 1154 if (mode & S_IWGRP) 1155 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1156 if (mode & S_IXGRP) 1157 group_allow |= ACL_EXECUTE; 1158 1159 if (mode & S_IROTH) 1160 everyone_allow |= ACL_READ_DATA; 1161 if (mode & S_IWOTH) 1162 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1163 if (mode & S_IXOTH) 1164 everyone_allow |= ACL_EXECUTE; 1165 1166 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1167 group_deny = everyone_allow & ~group_allow; 1168 user_allow_first = group_deny & ~user_deny; 1169 1170 if (user_allow_first != 0) 1171 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1172 ACL_ENTRY_TYPE_ALLOW); 1173 if (user_deny != 0) 1174 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1175 ACL_ENTRY_TYPE_DENY); 1176 if (group_deny != 0) 1177 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1178 ACL_ENTRY_TYPE_DENY); 1179 1180 if (parent_aclp != NULL) 1181 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1182 file_owner_id, is_directory); 1183 1184 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1185 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1186 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1187 } 1188 1189 #ifdef _KERNEL 1190 void 1191 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1192 struct acl *child_aclp, mode_t mode, int file_owner_id, 1193 int is_directory) 1194 { 1195 1196 if (acl_nfs4_old_semantics) 1197 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1198 mode, file_owner_id, is_directory); 1199 else 1200 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1201 mode, file_owner_id, is_directory); 1202 } 1203 #endif /* _KERNEL */ 1204 1205 /* 1206 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1207 * Note that this results in an ACL different from (but semantically 1208 * equal to) the "canonical six" trivial ACL computed using algorithm 1209 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1210 */ 1211 static void 1212 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1213 { 1214 1215 aclp->acl_cnt = 0; 1216 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1217 } 1218 1219 #ifndef _KERNEL 1220 /* 1221 * This routine is used by libc to implement acl_strip_np(3) 1222 * and acl_is_trivial_np(3). 1223 */ 1224 void 1225 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1226 { 1227 1228 aclp->acl_cnt = 0; 1229 if (canonical_six) 1230 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1231 else 1232 acl_nfs4_trivial_from_mode(aclp, mode); 1233 } 1234 #endif /* !_KERNEL */ 1235 1236 #ifdef _KERNEL 1237 static int 1238 _acls_are_equal(const struct acl *a, const struct acl *b) 1239 { 1240 int i; 1241 const struct acl_entry *entrya, *entryb; 1242 1243 if (a->acl_cnt != b->acl_cnt) 1244 return (0); 1245 1246 for (i = 0; i < b->acl_cnt; i++) { 1247 entrya = &(a->acl_entry[i]); 1248 entryb = &(b->acl_entry[i]); 1249 1250 if (entrya->ae_tag != entryb->ae_tag || 1251 entrya->ae_id != entryb->ae_id || 1252 entrya->ae_perm != entryb->ae_perm || 1253 entrya->ae_entry_type != entryb->ae_entry_type || 1254 entrya->ae_flags != entryb->ae_flags) 1255 return (0); 1256 } 1257 1258 return (1); 1259 } 1260 1261 /* 1262 * This routine is used to determine whether to remove extended attribute 1263 * that stores ACL contents. 1264 */ 1265 int 1266 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1267 { 1268 int trivial; 1269 mode_t tmpmode = 0; 1270 struct acl *tmpaclp; 1271 1272 if (aclp->acl_cnt > 6) 1273 return (0); 1274 1275 /* 1276 * Compute the mode from the ACL, then compute new ACL from that mode. 1277 * If the ACLs are identical, then the ACL is trivial. 1278 * 1279 * XXX: I guess there is a faster way to do this. However, even 1280 * this slow implementation significantly speeds things up 1281 * for files that don't have non-trivial ACLs - it's critical 1282 * for performance to not use EA when they are not needed. 1283 * 1284 * First try the PSARC/2010/029 semantics. 1285 */ 1286 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1287 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1288 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1289 trivial = _acls_are_equal(aclp, tmpaclp); 1290 if (trivial) { 1291 acl_free(tmpaclp); 1292 return (trivial); 1293 } 1294 1295 /* 1296 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1297 */ 1298 tmpaclp->acl_cnt = 0; 1299 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1300 trivial = _acls_are_equal(aclp, tmpaclp); 1301 acl_free(tmpaclp); 1302 1303 return (trivial); 1304 } 1305 #endif /* _KERNEL */ 1306 1307 int 1308 acl_nfs4_check(const struct acl *aclp, int is_directory) 1309 { 1310 int i; 1311 const struct acl_entry *entry; 1312 1313 /* 1314 * The spec doesn't seem to say anything about ACL validity. 1315 * It seems there is not much to do here. There is even no need 1316 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1317 * entries, as there can be several of them and that's perfectly 1318 * valid. There can be none of them too. Really. 1319 */ 1320 1321 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1322 return (EINVAL); 1323 1324 for (i = 0; i < aclp->acl_cnt; i++) { 1325 entry = &(aclp->acl_entry[i]); 1326 1327 switch (entry->ae_tag) { 1328 case ACL_USER_OBJ: 1329 case ACL_GROUP_OBJ: 1330 case ACL_EVERYONE: 1331 if (entry->ae_id != ACL_UNDEFINED_ID) 1332 return (EINVAL); 1333 break; 1334 1335 case ACL_USER: 1336 case ACL_GROUP: 1337 if (entry->ae_id == ACL_UNDEFINED_ID) 1338 return (EINVAL); 1339 break; 1340 1341 default: 1342 return (EINVAL); 1343 } 1344 1345 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1346 return (EINVAL); 1347 1348 /* 1349 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1350 */ 1351 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1352 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1353 return (EINVAL); 1354 1355 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1356 return (EINVAL); 1357 1358 /* Disallow unimplemented flags. */ 1359 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1360 ACL_ENTRY_FAILED_ACCESS)) 1361 return (EINVAL); 1362 1363 /* Disallow flags not allowed for ordinary files. */ 1364 if (!is_directory) { 1365 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1366 ACL_ENTRY_DIRECTORY_INHERIT | 1367 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1368 return (EINVAL); 1369 } 1370 } 1371 1372 return (0); 1373 }
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