1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008-2010 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * ACL support routines specific to NFSv4 access control lists. These are 30 * utility routines for code common across file systems implementing NFSv4 31 * ACLs. 32 */ 33 34 #ifdef _KERNEL 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/systm.h> 42 #include <sys/mount.h> 43 #include <sys/priv.h> 44 #include <sys/vnode.h> 45 #include <sys/errno.h> 46 #include <sys/stat.h> 47 #include <sys/sysctl.h> 48 #include <sys/acl.h> 49 #else 50 #include <errno.h> 51 #include <assert.h> 52 #include <sys/acl.h> 53 #include <sys/stat.h> 54 #define KASSERT(a, b) assert(a) 55 #define CTASSERT(a) 56 57 #endif /* !_KERNEL */ 58 59 #ifdef _KERNEL 60 61 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 62 63 static int acl_nfs4_old_semantics = 0; 64 65 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 66 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 67 68 static struct { 69 accmode_t accmode; 70 int mask; 71 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 72 {VWRITE, ACL_WRITE_DATA}, 73 {VAPPEND, ACL_APPEND_DATA}, 74 {VEXEC, ACL_EXECUTE}, 75 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 76 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 77 {VDELETE_CHILD, ACL_DELETE_CHILD}, 78 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 79 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 80 {VDELETE, ACL_DELETE}, 81 {VREAD_ACL, ACL_READ_ACL}, 82 {VWRITE_ACL, ACL_WRITE_ACL}, 83 {VWRITE_OWNER, ACL_WRITE_OWNER}, 84 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 85 {0, 0}}; 86 87 static int 88 _access_mask_from_accmode(accmode_t accmode) 89 { 90 int access_mask = 0, i; 91 92 for (i = 0; accmode2mask[i].accmode != 0; i++) { 93 if (accmode & accmode2mask[i].accmode) 94 access_mask |= accmode2mask[i].mask; 95 } 96 97 /* 98 * VAPPEND is just a modifier for VWRITE; if the caller asked 99 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 100 */ 101 if (access_mask & ACL_APPEND_DATA) 102 access_mask &= ~ACL_WRITE_DATA; 103 104 return (access_mask); 105 } 106 107 /* 108 * Return 0, iff access is allowed, 1 otherwise. 109 */ 110 static int 111 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 112 int file_uid, int file_gid, int *denied_explicitly) 113 { 114 int i; 115 const struct acl_entry *entry; 116 117 if (denied_explicitly != NULL) 118 *denied_explicitly = 0; 119 120 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 121 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 122 123 for (i = 0; i < aclp->acl_cnt; i++) { 124 entry = &(aclp->acl_entry[i]); 125 126 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 127 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 128 continue; 129 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 130 continue; 131 switch (entry->ae_tag) { 132 case ACL_USER_OBJ: 133 if (file_uid != cred->cr_uid) 134 continue; 135 break; 136 case ACL_USER: 137 if (entry->ae_id != cred->cr_uid) 138 continue; 139 break; 140 case ACL_GROUP_OBJ: 141 if (!groupmember(file_gid, cred)) 142 continue; 143 break; 144 case ACL_GROUP: 145 if (!groupmember(entry->ae_id, cred)) 146 continue; 147 break; 148 default: 149 KASSERT(entry->ae_tag == ACL_EVERYONE, 150 ("entry->ae_tag == ACL_EVERYONE")); 151 } 152 153 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 154 if (entry->ae_perm & access_mask) { 155 if (denied_explicitly != NULL) 156 *denied_explicitly = 1; 157 return (1); 158 } 159 } 160 161 access_mask &= ~(entry->ae_perm); 162 if (access_mask == 0) 163 return (0); 164 } 165 166 if (access_mask == 0) 167 return (0); 168 169 return (1); 170 } 171 172 int 173 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 174 struct acl *aclp, accmode_t accmode, struct ucred *cred) 175 { 176 accmode_t priv_granted = 0; 177 int denied, explicitly_denied, access_mask, is_directory, 178 must_be_owner = 0; 179 mode_t file_mode = 0; 180 181 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 182 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 183 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 184 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 185 ("invalid bit in accmode")); 186 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 187 ("VAPPEND without VWRITE")); 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, PRIV_VFS_LOOKUP)) 259 priv_granted |= VEXEC; 260 } else { 261 /* 262 * Ensure that at least one execute bit is on. Otherwise, 263 * a privileged user will always succeed, and we don't want 264 * this to happen unless the file really is executable. 265 */ 266 if ((accmode & VEXEC) && (file_mode & 267 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 268 !priv_check_cred(cred, PRIV_VFS_EXEC)) 269 priv_granted |= VEXEC; 270 } 271 272 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ)) 273 priv_granted |= VREAD; 274 275 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 276 !priv_check_cred(cred, PRIV_VFS_WRITE)) 277 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 278 279 if ((accmode & VADMIN_PERMS) && 280 !priv_check_cred(cred, PRIV_VFS_ADMIN)) 281 priv_granted |= VADMIN_PERMS; 282 283 if ((accmode & VSTAT_PERMS) && 284 !priv_check_cred(cred, PRIV_VFS_STAT)) 285 priv_granted |= VSTAT_PERMS; 286 287 if ((accmode & priv_granted) == accmode) { 288 return (0); 289 } 290 291 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 292 denied = EPERM; 293 else 294 denied = EACCES; 295 296 return (denied); 297 } 298 #endif /* _KERNEL */ 299 300 static int 301 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 302 acl_entry_type_t entry_type) 303 { 304 if (entry->ae_tag != tag) 305 return (0); 306 307 if (entry->ae_id != ACL_UNDEFINED_ID) 308 return (0); 309 310 if (entry->ae_perm != perm) 311 return (0); 312 313 if (entry->ae_entry_type != entry_type) 314 return (0); 315 316 if (entry->ae_flags != 0) 317 return (0); 318 319 return (1); 320 } 321 322 static struct acl_entry * 323 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 324 acl_entry_type_t entry_type) 325 { 326 struct acl_entry *entry; 327 328 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 329 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 330 331 entry = &(aclp->acl_entry[aclp->acl_cnt]); 332 aclp->acl_cnt++; 333 334 entry->ae_tag = tag; 335 entry->ae_id = ACL_UNDEFINED_ID; 336 entry->ae_perm = perm; 337 entry->ae_entry_type = entry_type; 338 entry->ae_flags = 0; 339 340 return (entry); 341 } 342 343 static struct acl_entry * 344 _acl_duplicate_entry(struct acl *aclp, unsigned entry_index) 345 { 346 unsigned i; 347 348 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 349 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 350 351 for (i = aclp->acl_cnt; i > entry_index; i--) 352 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 353 354 aclp->acl_cnt++; 355 356 return (&(aclp->acl_entry[entry_index + 1])); 357 } 358 359 static void 360 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 361 int file_owner_id) 362 { 363 int meets, must_append; 364 unsigned i; 365 struct acl_entry *entry, *copy, *previous, 366 *a1, *a2, *a3, *a4, *a5, *a6; 367 mode_t amode; 368 const int READ = 04; 369 const int WRITE = 02; 370 const int EXEC = 01; 371 372 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 373 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 374 375 /* 376 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 377 * 378 * 3.16.6.3. Applying a Mode to an Existing ACL 379 */ 380 381 /* 382 * 1. For each ACE: 383 */ 384 for (i = 0; i < aclp->acl_cnt; i++) { 385 entry = &(aclp->acl_entry[i]); 386 387 /* 388 * 1.1. If the type is neither ALLOW or DENY - skip. 389 */ 390 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 391 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 392 continue; 393 394 /* 395 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 396 */ 397 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 398 continue; 399 400 /* 401 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 402 * are set: 403 */ 404 if (entry->ae_flags & 405 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 406 /* 407 * 1.3.1. A copy of the current ACE is made, and placed 408 * in the ACL immediately following the current 409 * ACE. 410 */ 411 copy = _acl_duplicate_entry(aclp, i); 412 413 /* 414 * 1.3.2. In the first ACE, the flag 415 * ACL_ENTRY_INHERIT_ONLY is set. 416 */ 417 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 418 419 /* 420 * 1.3.3. In the second ACE, the following flags 421 * are cleared: 422 * ACL_ENTRY_FILE_INHERIT, 423 * ACL_ENTRY_DIRECTORY_INHERIT, 424 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 425 */ 426 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 427 ACL_ENTRY_DIRECTORY_INHERIT | 428 ACL_ENTRY_NO_PROPAGATE_INHERIT); 429 430 /* 431 * The algorithm continues on with the second ACE. 432 */ 433 i++; 434 entry = copy; 435 } 436 437 /* 438 * 1.4. If it's owner@, group@ or everyone@ entry, clear 439 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 440 * and ACL_EXECUTE. Continue to the next entry. 441 */ 442 if (entry->ae_tag == ACL_USER_OBJ || 443 entry->ae_tag == ACL_GROUP_OBJ || 444 entry->ae_tag == ACL_EVERYONE) { 445 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 446 ACL_APPEND_DATA | ACL_EXECUTE); 447 continue; 448 } 449 450 /* 451 * 1.5. Otherwise, if the "who" field did not match one 452 * of OWNER@, GROUP@, EVERYONE@: 453 * 454 * 1.5.1. If the type is ALLOW, check the preceding ACE. 455 * If it does not meet all of the following criteria: 456 */ 457 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 458 continue; 459 460 meets = 0; 461 if (i > 0) { 462 meets = 1; 463 previous = &(aclp->acl_entry[i - 1]); 464 465 /* 466 * 1.5.1.1. The type field is DENY, 467 */ 468 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 469 meets = 0; 470 471 /* 472 * 1.5.1.2. The "who" field is the same as the current 473 * ACE, 474 * 475 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 476 * is the same as it is in the current ACE, 477 * and no other flag bits are set, 478 */ 479 if (previous->ae_id != entry->ae_id || 480 previous->ae_tag != entry->ae_tag) 481 meets = 0; 482 483 if (previous->ae_flags) 484 meets = 0; 485 486 /* 487 * 1.5.1.4. The mask bits are a subset of the mask bits 488 * of the current ACE, and are also subset of 489 * the following: ACL_READ_DATA, 490 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 491 */ 492 if (previous->ae_perm & ~(entry->ae_perm)) 493 meets = 0; 494 495 if (previous->ae_perm & ~(ACL_READ_DATA | 496 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 497 meets = 0; 498 } 499 500 if (!meets) { 501 /* 502 * Then the ACE of type DENY, with a who equal 503 * to the current ACE, flag bits equal to 504 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 505 * and no mask bits, is prepended. 506 */ 507 previous = entry; 508 entry = _acl_duplicate_entry(aclp, i); 509 510 /* Adjust counter, as we've just added an entry. */ 511 i++; 512 513 previous->ae_tag = entry->ae_tag; 514 previous->ae_id = entry->ae_id; 515 previous->ae_flags = entry->ae_flags; 516 previous->ae_perm = 0; 517 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 518 } 519 520 /* 521 * 1.5.2. The following modifications are made to the prepended 522 * ACE. The intent is to mask the following ACE 523 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 524 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 525 * permissions of the new mode. As a special case, 526 * if the ACE matches the current owner of the file, 527 * the owner bits are used, rather than the group bits. 528 * This is reflected in the algorithm below. 529 */ 530 amode = mode >> 3; 531 532 /* 533 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 534 * in ACE matches the owner of the file, we shift amode three 535 * more bits, in order to have the owner permission bits 536 * placed in the three low order bits of amode. 537 */ 538 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 539 amode = amode >> 3; 540 541 if (entry->ae_perm & ACL_READ_DATA) { 542 if (amode & READ) 543 previous->ae_perm &= ~ACL_READ_DATA; 544 else 545 previous->ae_perm |= ACL_READ_DATA; 546 } 547 548 if (entry->ae_perm & ACL_WRITE_DATA) { 549 if (amode & WRITE) 550 previous->ae_perm &= ~ACL_WRITE_DATA; 551 else 552 previous->ae_perm |= ACL_WRITE_DATA; 553 } 554 555 if (entry->ae_perm & ACL_APPEND_DATA) { 556 if (amode & WRITE) 557 previous->ae_perm &= ~ACL_APPEND_DATA; 558 else 559 previous->ae_perm |= ACL_APPEND_DATA; 560 } 561 562 if (entry->ae_perm & ACL_EXECUTE) { 563 if (amode & EXEC) 564 previous->ae_perm &= ~ACL_EXECUTE; 565 else 566 previous->ae_perm |= ACL_EXECUTE; 567 } 568 569 /* 570 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 571 * of the ALLOW ace: 572 * 573 * XXX: This point is not there in the Falkner's draft. 574 */ 575 if (entry->ae_tag == ACL_GROUP && 576 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 577 mode_t extramode, ownermode; 578 extramode = (mode >> 3) & 07; 579 ownermode = mode >> 6; 580 extramode &= ~ownermode; 581 582 if (extramode) { 583 if (extramode & READ) { 584 entry->ae_perm &= ~ACL_READ_DATA; 585 previous->ae_perm &= ~ACL_READ_DATA; 586 } 587 588 if (extramode & WRITE) { 589 entry->ae_perm &= 590 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 591 previous->ae_perm &= 592 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 593 } 594 595 if (extramode & EXEC) { 596 entry->ae_perm &= ~ACL_EXECUTE; 597 previous->ae_perm &= ~ACL_EXECUTE; 598 } 599 } 600 } 601 } 602 603 /* 604 * 2. If there at least six ACEs, the final six ACEs are examined. 605 * If they are not equal to what we want, append six ACEs. 606 */ 607 must_append = 0; 608 if (aclp->acl_cnt < 6) { 609 must_append = 1; 610 } else { 611 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 612 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 613 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 614 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 615 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 616 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 617 618 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 619 ACL_ENTRY_TYPE_DENY)) 620 must_append = 1; 621 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 622 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 623 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 624 must_append = 1; 625 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 626 ACL_ENTRY_TYPE_DENY)) 627 must_append = 1; 628 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 629 ACL_ENTRY_TYPE_ALLOW)) 630 must_append = 1; 631 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 632 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 633 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 634 must_append = 1; 635 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 636 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 637 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 638 must_append = 1; 639 } 640 641 if (must_append) { 642 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 643 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 644 645 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 646 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 647 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 648 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 649 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 650 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 651 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 652 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 653 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 654 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 655 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 656 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 657 658 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 659 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 660 } 661 662 /* 663 * 3. The final six ACEs are adjusted according to the incoming mode. 664 */ 665 if (mode & S_IRUSR) 666 a2->ae_perm |= ACL_READ_DATA; 667 else 668 a1->ae_perm |= ACL_READ_DATA; 669 if (mode & S_IWUSR) 670 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 671 else 672 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 673 if (mode & S_IXUSR) 674 a2->ae_perm |= ACL_EXECUTE; 675 else 676 a1->ae_perm |= ACL_EXECUTE; 677 678 if (mode & S_IRGRP) 679 a4->ae_perm |= ACL_READ_DATA; 680 else 681 a3->ae_perm |= ACL_READ_DATA; 682 if (mode & S_IWGRP) 683 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 684 else 685 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 686 if (mode & S_IXGRP) 687 a4->ae_perm |= ACL_EXECUTE; 688 else 689 a3->ae_perm |= ACL_EXECUTE; 690 691 if (mode & S_IROTH) 692 a6->ae_perm |= ACL_READ_DATA; 693 else 694 a5->ae_perm |= ACL_READ_DATA; 695 if (mode & S_IWOTH) 696 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 697 else 698 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 699 if (mode & S_IXOTH) 700 a6->ae_perm |= ACL_EXECUTE; 701 else 702 a5->ae_perm |= ACL_EXECUTE; 703 } 704 705 #ifdef _KERNEL 706 void 707 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 708 int file_owner_id) 709 { 710 711 if (acl_nfs4_old_semantics) 712 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 713 else 714 acl_nfs4_trivial_from_mode(aclp, mode); 715 } 716 #endif /* _KERNEL */ 717 718 void 719 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 720 { 721 int i; 722 mode_t old_mode = *_mode, mode = 0, seen = 0; 723 const struct acl_entry *entry; 724 725 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 726 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 727 728 /* 729 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 730 * 731 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 732 */ 733 734 for (i = 0; i < aclp->acl_cnt; i++) { 735 entry = &(aclp->acl_entry[i]); 736 737 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 738 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 739 continue; 740 741 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 742 continue; 743 744 if (entry->ae_tag == ACL_USER_OBJ) { 745 if ((entry->ae_perm & ACL_READ_DATA) && 746 ((seen & S_IRUSR) == 0)) { 747 seen |= S_IRUSR; 748 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 749 mode |= S_IRUSR; 750 } 751 if ((entry->ae_perm & ACL_WRITE_DATA) && 752 ((seen & S_IWUSR) == 0)) { 753 seen |= S_IWUSR; 754 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 755 mode |= S_IWUSR; 756 } 757 if ((entry->ae_perm & ACL_EXECUTE) && 758 ((seen & S_IXUSR) == 0)) { 759 seen |= S_IXUSR; 760 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 761 mode |= S_IXUSR; 762 } 763 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 764 if ((entry->ae_perm & ACL_READ_DATA) && 765 ((seen & S_IRGRP) == 0)) { 766 seen |= S_IRGRP; 767 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 768 mode |= S_IRGRP; 769 } 770 if ((entry->ae_perm & ACL_WRITE_DATA) && 771 ((seen & S_IWGRP) == 0)) { 772 seen |= S_IWGRP; 773 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 774 mode |= S_IWGRP; 775 } 776 if ((entry->ae_perm & ACL_EXECUTE) && 777 ((seen & S_IXGRP) == 0)) { 778 seen |= S_IXGRP; 779 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 780 mode |= S_IXGRP; 781 } 782 } else if (entry->ae_tag == ACL_EVERYONE) { 783 if (entry->ae_perm & ACL_READ_DATA) { 784 if ((seen & S_IRUSR) == 0) { 785 seen |= S_IRUSR; 786 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 787 mode |= S_IRUSR; 788 } 789 if ((seen & S_IRGRP) == 0) { 790 seen |= S_IRGRP; 791 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 792 mode |= S_IRGRP; 793 } 794 if ((seen & S_IROTH) == 0) { 795 seen |= S_IROTH; 796 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 797 mode |= S_IROTH; 798 } 799 } 800 if (entry->ae_perm & ACL_WRITE_DATA) { 801 if ((seen & S_IWUSR) == 0) { 802 seen |= S_IWUSR; 803 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 804 mode |= S_IWUSR; 805 } 806 if ((seen & S_IWGRP) == 0) { 807 seen |= S_IWGRP; 808 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 809 mode |= S_IWGRP; 810 } 811 if ((seen & S_IWOTH) == 0) { 812 seen |= S_IWOTH; 813 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 814 mode |= S_IWOTH; 815 } 816 } 817 if (entry->ae_perm & ACL_EXECUTE) { 818 if ((seen & S_IXUSR) == 0) { 819 seen |= S_IXUSR; 820 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 821 mode |= S_IXUSR; 822 } 823 if ((seen & S_IXGRP) == 0) { 824 seen |= S_IXGRP; 825 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 826 mode |= S_IXGRP; 827 } 828 if ((seen & S_IXOTH) == 0) { 829 seen |= S_IXOTH; 830 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 831 mode |= S_IXOTH; 832 } 833 } 834 } 835 } 836 837 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 838 } 839 840 #ifdef _KERNEL 841 /* 842 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 843 * draft-ietf-nfsv4-minorversion1-03.txt. 844 */ 845 static void 846 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 847 struct acl *child_aclp, mode_t mode, int file_owner_id, 848 int is_directory) 849 { 850 int i, flags; 851 const struct acl_entry *parent_entry; 852 struct acl_entry *entry, *copy; 853 854 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 855 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 856 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 857 858 /* 859 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 860 * 861 * 3.16.6.2. Applying the mode given to CREATE or OPEN 862 * to an inherited ACL 863 */ 864 865 /* 866 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 867 */ 868 for (i = 0; i < parent_aclp->acl_cnt; i++) { 869 parent_entry = &(parent_aclp->acl_entry[i]); 870 flags = parent_entry->ae_flags; 871 872 /* 873 * Entry is not inheritable at all. 874 */ 875 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 876 ACL_ENTRY_FILE_INHERIT)) == 0) 877 continue; 878 879 /* 880 * We're creating a file, but entry is not inheritable 881 * by files. 882 */ 883 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 884 continue; 885 886 /* 887 * Entry is inheritable only by files, but has NO_PROPAGATE 888 * flag set, and we're creating a directory, so it wouldn't 889 * propagate to any file in that directory anyway. 890 */ 891 if (is_directory && 892 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 893 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 894 continue; 895 896 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 897 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 898 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 899 child_aclp->acl_cnt++; 900 } 901 902 /* 903 * 2. For each entry in the new ACL, adjust its flags, possibly 904 * creating two entries in place of one. 905 */ 906 for (i = 0; i < child_aclp->acl_cnt; i++) { 907 entry = &(child_aclp->acl_entry[i]); 908 909 /* 910 * This is not in the specification, but SunOS 911 * apparently does that. 912 */ 913 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 914 !is_directory) && 915 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 916 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 917 918 /* 919 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 920 * being created is not a directory, then clear the 921 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 922 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 923 * ACL_ENTRY_INHERIT_ONLY. 924 */ 925 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 926 !is_directory) { 927 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 928 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 929 ACL_ENTRY_INHERIT_ONLY); 930 931 /* 932 * Continue on to the next ACE. 933 */ 934 continue; 935 } 936 937 /* 938 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 939 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 940 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 941 * next ACE. Otherwise... 942 */ 943 /* 944 * XXX: Read it again and make sure what does the "otherwise" 945 * apply to. 946 */ 947 if (is_directory && 948 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 949 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 950 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 951 continue; 952 } 953 954 /* 955 * 2.C. If the type of the ACE is neither ALLOW nor deny, 956 * then continue. 957 */ 958 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 959 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 960 continue; 961 962 /* 963 * 2.D. Copy the original ACE into a second, adjacent ACE. 964 */ 965 copy = _acl_duplicate_entry(child_aclp, i); 966 967 /* 968 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 969 * is set. 970 */ 971 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 972 973 /* 974 * 2.F. On the second ACE, clear the following flags: 975 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 976 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 977 */ 978 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 979 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 980 ACL_ENTRY_INHERIT_ONLY); 981 982 /* 983 * 2.G. On the second ACE, if the type is ALLOW, 984 * an implementation MAY clear the following 985 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 986 */ 987 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 988 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 989 990 /* 991 * Increment the counter to skip the copied entry. 992 */ 993 i++; 994 } 995 996 /* 997 * 3. To ensure that the mode is honored, apply the algorithm describe 998 * in Section 2.16.6.3, using the mode that is to be used for file 999 * creation. 1000 */ 1001 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1002 } 1003 #endif /* _KERNEL */ 1004 1005 /* 1006 * Populate the ACL with entries inherited from parent_aclp. 1007 */ 1008 static void 1009 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1010 struct acl *child_aclp, mode_t mode, int file_owner_id, 1011 int is_directory) 1012 { 1013 int i, flags, tag; 1014 const struct acl_entry *parent_entry; 1015 struct acl_entry *entry; 1016 1017 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1018 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1019 1020 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1021 parent_entry = &(parent_aclp->acl_entry[i]); 1022 flags = parent_entry->ae_flags; 1023 tag = parent_entry->ae_tag; 1024 1025 /* 1026 * Don't inherit owner@, group@, or everyone@ entries. 1027 */ 1028 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1029 tag == ACL_EVERYONE) 1030 continue; 1031 1032 /* 1033 * Entry is not inheritable at all. 1034 */ 1035 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1036 ACL_ENTRY_FILE_INHERIT)) == 0) 1037 continue; 1038 1039 /* 1040 * We're creating a file, but entry is not inheritable 1041 * by files. 1042 */ 1043 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1044 continue; 1045 1046 /* 1047 * Entry is inheritable only by files, but has NO_PROPAGATE 1048 * flag set, and we're creating a directory, so it wouldn't 1049 * propagate to any file in that directory anyway. 1050 */ 1051 if (is_directory && 1052 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1053 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1054 continue; 1055 1056 /* 1057 * Entry qualifies for being inherited. 1058 */ 1059 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1060 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1061 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1062 *entry = *parent_entry; 1063 child_aclp->acl_cnt++; 1064 1065 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1066 entry->ae_flags |= ACL_ENTRY_INHERITED; 1067 1068 /* 1069 * If the type of the ACE is neither ALLOW nor DENY, 1070 * then leave it as it is and proceed to the next one. 1071 */ 1072 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1073 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1074 continue; 1075 1076 /* 1077 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1078 * the object being created is not a directory, then clear 1079 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1080 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1081 * ACL_ENTRY_INHERIT_ONLY. 1082 */ 1083 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1084 !is_directory) { 1085 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1086 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1087 ACL_ENTRY_INHERIT_ONLY); 1088 } 1089 1090 /* 1091 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1092 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1093 * that ACL_ENTRY_INHERIT_ONLY is set. 1094 */ 1095 if (is_directory && 1096 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1097 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1098 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1099 } 1100 1101 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1102 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1103 /* 1104 * Some permissions must never be inherited. 1105 */ 1106 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1107 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1108 1109 /* 1110 * Others must be masked according to the file mode. 1111 */ 1112 if ((mode & S_IRGRP) == 0) 1113 entry->ae_perm &= ~ACL_READ_DATA; 1114 if ((mode & S_IWGRP) == 0) 1115 entry->ae_perm &= 1116 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1117 if ((mode & S_IXGRP) == 0) 1118 entry->ae_perm &= ~ACL_EXECUTE; 1119 } 1120 } 1121 } 1122 1123 /* 1124 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1125 * It's also being used to calculate a trivial ACL, by inheriting from 1126 * a NULL ACL. 1127 */ 1128 static void 1129 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1130 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1131 { 1132 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1133 acl_perm_t user_allow, group_allow, everyone_allow; 1134 1135 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1136 1137 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1138 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1139 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1140 ACL_WRITE_NAMED_ATTRS; 1141 1142 if (mode & S_IRUSR) 1143 user_allow |= ACL_READ_DATA; 1144 if (mode & S_IWUSR) 1145 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1146 if (mode & S_IXUSR) 1147 user_allow |= ACL_EXECUTE; 1148 1149 if (mode & S_IRGRP) 1150 group_allow |= ACL_READ_DATA; 1151 if (mode & S_IWGRP) 1152 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1153 if (mode & S_IXGRP) 1154 group_allow |= ACL_EXECUTE; 1155 1156 if (mode & S_IROTH) 1157 everyone_allow |= ACL_READ_DATA; 1158 if (mode & S_IWOTH) 1159 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1160 if (mode & S_IXOTH) 1161 everyone_allow |= ACL_EXECUTE; 1162 1163 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1164 group_deny = everyone_allow & ~group_allow; 1165 user_allow_first = group_deny & ~user_deny; 1166 1167 if (user_allow_first != 0) 1168 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1169 ACL_ENTRY_TYPE_ALLOW); 1170 if (user_deny != 0) 1171 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1172 ACL_ENTRY_TYPE_DENY); 1173 if (group_deny != 0) 1174 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1175 ACL_ENTRY_TYPE_DENY); 1176 1177 if (parent_aclp != NULL) 1178 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1179 file_owner_id, is_directory); 1180 1181 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1182 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1183 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1184 } 1185 1186 #ifdef _KERNEL 1187 void 1188 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1189 struct acl *child_aclp, mode_t mode, int file_owner_id, 1190 int is_directory) 1191 { 1192 1193 if (acl_nfs4_old_semantics) 1194 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1195 mode, file_owner_id, is_directory); 1196 else 1197 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1198 mode, file_owner_id, is_directory); 1199 } 1200 #endif /* _KERNEL */ 1201 1202 /* 1203 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1204 * Note that this results in an ACL different from (but semantically 1205 * equal to) the "canonical six" trivial ACL computed using algorithm 1206 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1207 */ 1208 static void 1209 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1210 { 1211 1212 aclp->acl_cnt = 0; 1213 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1214 } 1215 1216 #ifndef _KERNEL 1217 /* 1218 * This routine is used by libc to implement acl_strip_np(3) 1219 * and acl_is_trivial_np(3). 1220 */ 1221 void 1222 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1223 { 1224 1225 aclp->acl_cnt = 0; 1226 if (canonical_six) 1227 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1228 else 1229 acl_nfs4_trivial_from_mode(aclp, mode); 1230 } 1231 #endif /* !_KERNEL */ 1232 1233 #ifdef _KERNEL 1234 static int 1235 _acls_are_equal(const struct acl *a, const struct acl *b) 1236 { 1237 int i; 1238 const struct acl_entry *entrya, *entryb; 1239 1240 if (a->acl_cnt != b->acl_cnt) 1241 return (0); 1242 1243 for (i = 0; i < b->acl_cnt; i++) { 1244 entrya = &(a->acl_entry[i]); 1245 entryb = &(b->acl_entry[i]); 1246 1247 if (entrya->ae_tag != entryb->ae_tag || 1248 entrya->ae_id != entryb->ae_id || 1249 entrya->ae_perm != entryb->ae_perm || 1250 entrya->ae_entry_type != entryb->ae_entry_type || 1251 entrya->ae_flags != entryb->ae_flags) 1252 return (0); 1253 } 1254 1255 return (1); 1256 } 1257 1258 /* 1259 * This routine is used to determine whether to remove extended attribute 1260 * that stores ACL contents. 1261 */ 1262 int 1263 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1264 { 1265 int trivial; 1266 mode_t tmpmode = 0; 1267 struct acl *tmpaclp; 1268 1269 if (aclp->acl_cnt > 6) 1270 return (0); 1271 1272 /* 1273 * Compute the mode from the ACL, then compute new ACL from that mode. 1274 * If the ACLs are identical, then the ACL is trivial. 1275 * 1276 * XXX: I guess there is a faster way to do this. However, even 1277 * this slow implementation significantly speeds things up 1278 * for files that don't have non-trivial ACLs - it's critical 1279 * for performance to not use EA when they are not needed. 1280 * 1281 * First try the PSARC/2010/029 semantics. 1282 */ 1283 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1284 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1285 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1286 trivial = _acls_are_equal(aclp, tmpaclp); 1287 if (trivial) { 1288 acl_free(tmpaclp); 1289 return (trivial); 1290 } 1291 1292 /* 1293 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1294 */ 1295 tmpaclp->acl_cnt = 0; 1296 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1297 trivial = _acls_are_equal(aclp, tmpaclp); 1298 acl_free(tmpaclp); 1299 1300 return (trivial); 1301 } 1302 #endif /* _KERNEL */ 1303 1304 int 1305 acl_nfs4_check(const struct acl *aclp, int is_directory) 1306 { 1307 int i; 1308 const struct acl_entry *entry; 1309 1310 /* 1311 * The spec doesn't seem to say anything about ACL validity. 1312 * It seems there is not much to do here. There is even no need 1313 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1314 * entries, as there can be several of them and that's perfectly 1315 * valid. There can be none of them too. Really. 1316 */ 1317 1318 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1319 return (EINVAL); 1320 1321 for (i = 0; i < aclp->acl_cnt; i++) { 1322 entry = &(aclp->acl_entry[i]); 1323 1324 switch (entry->ae_tag) { 1325 case ACL_USER_OBJ: 1326 case ACL_GROUP_OBJ: 1327 case ACL_EVERYONE: 1328 if (entry->ae_id != ACL_UNDEFINED_ID) 1329 return (EINVAL); 1330 break; 1331 1332 case ACL_USER: 1333 case ACL_GROUP: 1334 if (entry->ae_id == ACL_UNDEFINED_ID) 1335 return (EINVAL); 1336 break; 1337 1338 default: 1339 return (EINVAL); 1340 } 1341 1342 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1343 return (EINVAL); 1344 1345 /* 1346 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1347 */ 1348 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1349 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1350 return (EINVAL); 1351 1352 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1353 return (EINVAL); 1354 1355 /* Disallow unimplemented flags. */ 1356 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1357 ACL_ENTRY_FAILED_ACCESS)) 1358 return (EINVAL); 1359 1360 /* Disallow flags not allowed for ordinary files. */ 1361 if (!is_directory) { 1362 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1363 ACL_ENTRY_DIRECTORY_INHERIT | 1364 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1365 return (EINVAL); 1366 } 1367 } 1368 1369 return (0); 1370 } 1371 1372 #ifdef _KERNEL 1373 static int 1374 acl_nfs4_modload(module_t module, int what, void *arg) 1375 { 1376 int ret; 1377 1378 ret = 0; 1379 1380 switch (what) { 1381 case MOD_LOAD: 1382 case MOD_SHUTDOWN: 1383 break; 1384 1385 case MOD_QUIESCE: 1386 /* XXX TODO */ 1387 ret = 0; 1388 break; 1389 1390 case MOD_UNLOAD: 1391 /* XXX TODO */ 1392 ret = 0; 1393 break; 1394 default: 1395 ret = EINVAL; 1396 break; 1397 } 1398 1399 return (ret); 1400 } 1401 1402 static moduledata_t acl_nfs4_mod = { 1403 "acl_nfs4", 1404 acl_nfs4_modload, 1405 NULL 1406 }; 1407 1408 /* 1409 * XXX TODO: which subsystem, order? 1410 */ 1411 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST); 1412 MODULE_VERSION(acl_nfs4, 1); 1413 #endif /* _KERNEL */ 1414