1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008-2010 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * ACL support routines specific to NFSv4 access control lists. These are 31 * utility routines for code common across file systems implementing NFSv4 32 * ACLs. 33 */ 34 35 #ifdef _KERNEL 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/systm.h> 43 #include <sys/mount.h> 44 #include <sys/priv.h> 45 #include <sys/vnode.h> 46 #include <sys/errno.h> 47 #include <sys/stat.h> 48 #include <sys/sysctl.h> 49 #include <sys/acl.h> 50 #else 51 #include <errno.h> 52 #include <assert.h> 53 #include <sys/acl.h> 54 #include <sys/stat.h> 55 #define KASSERT(a, b) assert(a) 56 #define CTASSERT(a) 57 58 #endif /* !_KERNEL */ 59 60 #ifdef _KERNEL 61 62 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 63 64 static int acl_nfs4_old_semantics = 0; 65 66 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 67 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 68 69 static struct { 70 accmode_t accmode; 71 int mask; 72 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 73 {VWRITE, ACL_WRITE_DATA}, 74 {VAPPEND, ACL_APPEND_DATA}, 75 {VEXEC, ACL_EXECUTE}, 76 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 77 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 78 {VDELETE_CHILD, ACL_DELETE_CHILD}, 79 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 80 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 81 {VDELETE, ACL_DELETE}, 82 {VREAD_ACL, ACL_READ_ACL}, 83 {VWRITE_ACL, ACL_WRITE_ACL}, 84 {VWRITE_OWNER, ACL_WRITE_OWNER}, 85 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 86 {0, 0}}; 87 88 static int 89 _access_mask_from_accmode(accmode_t accmode) 90 { 91 int access_mask = 0, i; 92 93 for (i = 0; accmode2mask[i].accmode != 0; i++) { 94 if (accmode & accmode2mask[i].accmode) 95 access_mask |= accmode2mask[i].mask; 96 } 97 98 /* 99 * VAPPEND is just a modifier for VWRITE; if the caller asked 100 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 101 */ 102 if (access_mask & ACL_APPEND_DATA) 103 access_mask &= ~ACL_WRITE_DATA; 104 105 return (access_mask); 106 } 107 108 /* 109 * Return 0, iff access is allowed, 1 otherwise. 110 */ 111 static int 112 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 113 int file_uid, int file_gid, int *denied_explicitly) 114 { 115 int i; 116 const struct acl_entry *entry; 117 118 if (denied_explicitly != NULL) 119 *denied_explicitly = 0; 120 121 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 122 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 123 124 for (i = 0; i < aclp->acl_cnt; i++) { 125 entry = &(aclp->acl_entry[i]); 126 127 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 128 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 129 continue; 130 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 131 continue; 132 switch (entry->ae_tag) { 133 case ACL_USER_OBJ: 134 if (file_uid != cred->cr_uid) 135 continue; 136 break; 137 case ACL_USER: 138 if (entry->ae_id != cred->cr_uid) 139 continue; 140 break; 141 case ACL_GROUP_OBJ: 142 if (!groupmember(file_gid, cred)) 143 continue; 144 break; 145 case ACL_GROUP: 146 if (!groupmember(entry->ae_id, cred)) 147 continue; 148 break; 149 default: 150 KASSERT(entry->ae_tag == ACL_EVERYONE, 151 ("entry->ae_tag == ACL_EVERYONE")); 152 } 153 154 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 155 if (entry->ae_perm & access_mask) { 156 if (denied_explicitly != NULL) 157 *denied_explicitly = 1; 158 return (1); 159 } 160 } 161 162 access_mask &= ~(entry->ae_perm); 163 if (access_mask == 0) 164 return (0); 165 } 166 167 if (access_mask == 0) 168 return (0); 169 170 return (1); 171 } 172 173 int 174 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 175 struct acl *aclp, accmode_t accmode, struct ucred *cred) 176 { 177 accmode_t priv_granted = 0; 178 int denied, explicitly_denied, access_mask, is_directory, 179 must_be_owner = 0; 180 mode_t file_mode = 0; 181 182 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 183 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 184 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 185 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 186 ("invalid bit in accmode")); 187 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 188 ("VAPPEND without VWRITE")); 189 190 if (accmode & VADMIN) 191 must_be_owner = 1; 192 193 /* 194 * Ignore VSYNCHRONIZE permission. 195 */ 196 accmode &= ~VSYNCHRONIZE; 197 198 access_mask = _access_mask_from_accmode(accmode); 199 200 if (type == VDIR) 201 is_directory = 1; 202 else 203 is_directory = 0; 204 205 /* 206 * File owner is always allowed to read and write the ACL 207 * and basic attributes. This is to prevent a situation 208 * where user would change ACL in a way that prevents him 209 * from undoing the change. 210 */ 211 if (file_uid == cred->cr_uid) 212 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 213 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 214 215 /* 216 * Ignore append permission for regular files; use write 217 * permission instead. 218 */ 219 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 220 access_mask &= ~ACL_APPEND_DATA; 221 access_mask |= ACL_WRITE_DATA; 222 } 223 224 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 225 &explicitly_denied); 226 227 if (must_be_owner) { 228 if (file_uid != cred->cr_uid) 229 denied = EPERM; 230 } 231 232 /* 233 * For VEXEC, ensure that at least one execute bit is set for 234 * non-directories. We have to check the mode here to stay 235 * consistent with execve(2). See the test in 236 * exec_check_permissions(). 237 */ 238 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 239 if (!denied && !is_directory && (accmode & VEXEC) && 240 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 241 denied = EACCES; 242 243 if (!denied) 244 return (0); 245 246 /* 247 * Access failed. Iff it was not denied explicitly and 248 * VEXPLICIT_DENY flag was specified, allow access. 249 */ 250 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 251 return (0); 252 253 accmode &= ~VEXPLICIT_DENY; 254 255 /* 256 * No match. Try to use privileges, if there are any. 257 */ 258 if (is_directory) { 259 if ((accmode & VEXEC) && !priv_check_cred(cred, PRIV_VFS_LOOKUP)) 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)) 270 priv_granted |= VEXEC; 271 } 272 273 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ)) 274 priv_granted |= VREAD; 275 276 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 277 !priv_check_cred(cred, PRIV_VFS_WRITE)) 278 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 279 280 if ((accmode & VADMIN_PERMS) && 281 !priv_check_cred(cred, PRIV_VFS_ADMIN)) 282 priv_granted |= VADMIN_PERMS; 283 284 if ((accmode & VSTAT_PERMS) && 285 !priv_check_cred(cred, PRIV_VFS_STAT)) 286 priv_granted |= VSTAT_PERMS; 287 288 if ((accmode & priv_granted) == accmode) { 289 return (0); 290 } 291 292 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 293 denied = EPERM; 294 else 295 denied = EACCES; 296 297 return (denied); 298 } 299 #endif /* _KERNEL */ 300 301 static int 302 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 303 acl_entry_type_t entry_type) 304 { 305 if (entry->ae_tag != tag) 306 return (0); 307 308 if (entry->ae_id != ACL_UNDEFINED_ID) 309 return (0); 310 311 if (entry->ae_perm != perm) 312 return (0); 313 314 if (entry->ae_entry_type != entry_type) 315 return (0); 316 317 if (entry->ae_flags != 0) 318 return (0); 319 320 return (1); 321 } 322 323 static struct acl_entry * 324 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 325 acl_entry_type_t entry_type) 326 { 327 struct acl_entry *entry; 328 329 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 330 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 331 332 entry = &(aclp->acl_entry[aclp->acl_cnt]); 333 aclp->acl_cnt++; 334 335 entry->ae_tag = tag; 336 entry->ae_id = ACL_UNDEFINED_ID; 337 entry->ae_perm = perm; 338 entry->ae_entry_type = entry_type; 339 entry->ae_flags = 0; 340 341 return (entry); 342 } 343 344 static struct acl_entry * 345 _acl_duplicate_entry(struct acl *aclp, unsigned entry_index) 346 { 347 unsigned i; 348 349 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 350 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 351 352 for (i = aclp->acl_cnt; i > entry_index; i--) 353 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 354 355 aclp->acl_cnt++; 356 357 return (&(aclp->acl_entry[entry_index + 1])); 358 } 359 360 static void 361 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 362 int file_owner_id) 363 { 364 int meets, must_append; 365 unsigned i; 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 <= ACL_MAX_ENTRIES, 727 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 728 729 /* 730 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 731 * 732 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 733 */ 734 735 for (i = 0; i < aclp->acl_cnt; i++) { 736 entry = &(aclp->acl_entry[i]); 737 738 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 739 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 740 continue; 741 742 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 743 continue; 744 745 if (entry->ae_tag == ACL_USER_OBJ) { 746 if ((entry->ae_perm & ACL_READ_DATA) && 747 ((seen & S_IRUSR) == 0)) { 748 seen |= S_IRUSR; 749 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 750 mode |= S_IRUSR; 751 } 752 if ((entry->ae_perm & ACL_WRITE_DATA) && 753 ((seen & S_IWUSR) == 0)) { 754 seen |= S_IWUSR; 755 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 756 mode |= S_IWUSR; 757 } 758 if ((entry->ae_perm & ACL_EXECUTE) && 759 ((seen & S_IXUSR) == 0)) { 760 seen |= S_IXUSR; 761 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 762 mode |= S_IXUSR; 763 } 764 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 765 if ((entry->ae_perm & ACL_READ_DATA) && 766 ((seen & S_IRGRP) == 0)) { 767 seen |= S_IRGRP; 768 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 769 mode |= S_IRGRP; 770 } 771 if ((entry->ae_perm & ACL_WRITE_DATA) && 772 ((seen & S_IWGRP) == 0)) { 773 seen |= S_IWGRP; 774 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 775 mode |= S_IWGRP; 776 } 777 if ((entry->ae_perm & ACL_EXECUTE) && 778 ((seen & S_IXGRP) == 0)) { 779 seen |= S_IXGRP; 780 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 781 mode |= S_IXGRP; 782 } 783 } else if (entry->ae_tag == ACL_EVERYONE) { 784 if (entry->ae_perm & ACL_READ_DATA) { 785 if ((seen & S_IRUSR) == 0) { 786 seen |= S_IRUSR; 787 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 788 mode |= S_IRUSR; 789 } 790 if ((seen & S_IRGRP) == 0) { 791 seen |= S_IRGRP; 792 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 793 mode |= S_IRGRP; 794 } 795 if ((seen & S_IROTH) == 0) { 796 seen |= S_IROTH; 797 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 798 mode |= S_IROTH; 799 } 800 } 801 if (entry->ae_perm & ACL_WRITE_DATA) { 802 if ((seen & S_IWUSR) == 0) { 803 seen |= S_IWUSR; 804 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 805 mode |= S_IWUSR; 806 } 807 if ((seen & S_IWGRP) == 0) { 808 seen |= S_IWGRP; 809 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 810 mode |= S_IWGRP; 811 } 812 if ((seen & S_IWOTH) == 0) { 813 seen |= S_IWOTH; 814 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 815 mode |= S_IWOTH; 816 } 817 } 818 if (entry->ae_perm & ACL_EXECUTE) { 819 if ((seen & S_IXUSR) == 0) { 820 seen |= S_IXUSR; 821 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 822 mode |= S_IXUSR; 823 } 824 if ((seen & S_IXGRP) == 0) { 825 seen |= S_IXGRP; 826 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 827 mode |= S_IXGRP; 828 } 829 if ((seen & S_IXOTH) == 0) { 830 seen |= S_IXOTH; 831 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 832 mode |= S_IXOTH; 833 } 834 } 835 } 836 } 837 838 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 839 } 840 841 #ifdef _KERNEL 842 /* 843 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 844 * draft-ietf-nfsv4-minorversion1-03.txt. 845 */ 846 static void 847 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 848 struct acl *child_aclp, mode_t mode, int file_owner_id, 849 int is_directory) 850 { 851 int i, flags; 852 const struct acl_entry *parent_entry; 853 struct acl_entry *entry, *copy; 854 855 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 856 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 857 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 858 859 /* 860 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 861 * 862 * 3.16.6.2. Applying the mode given to CREATE or OPEN 863 * to an inherited ACL 864 */ 865 866 /* 867 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 868 */ 869 for (i = 0; i < parent_aclp->acl_cnt; i++) { 870 parent_entry = &(parent_aclp->acl_entry[i]); 871 flags = parent_entry->ae_flags; 872 873 /* 874 * Entry is not inheritable at all. 875 */ 876 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 877 ACL_ENTRY_FILE_INHERIT)) == 0) 878 continue; 879 880 /* 881 * We're creating a file, but entry is not inheritable 882 * by files. 883 */ 884 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 885 continue; 886 887 /* 888 * Entry is inheritable only by files, but has NO_PROPAGATE 889 * flag set, and we're creating a directory, so it wouldn't 890 * propagate to any file in that directory anyway. 891 */ 892 if (is_directory && 893 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 894 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 895 continue; 896 897 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 898 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 899 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 900 child_aclp->acl_cnt++; 901 } 902 903 /* 904 * 2. For each entry in the new ACL, adjust its flags, possibly 905 * creating two entries in place of one. 906 */ 907 for (i = 0; i < child_aclp->acl_cnt; i++) { 908 entry = &(child_aclp->acl_entry[i]); 909 910 /* 911 * This is not in the specification, but SunOS 912 * apparently does that. 913 */ 914 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 915 !is_directory) && 916 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 917 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 918 919 /* 920 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 921 * being created is not a directory, then clear the 922 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 923 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 924 * ACL_ENTRY_INHERIT_ONLY. 925 */ 926 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 927 !is_directory) { 928 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 929 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 930 ACL_ENTRY_INHERIT_ONLY); 931 932 /* 933 * Continue on to the next ACE. 934 */ 935 continue; 936 } 937 938 /* 939 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 940 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 941 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 942 * next ACE. Otherwise... 943 */ 944 /* 945 * XXX: Read it again and make sure what does the "otherwise" 946 * apply to. 947 */ 948 if (is_directory && 949 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 950 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 951 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 952 continue; 953 } 954 955 /* 956 * 2.C. If the type of the ACE is neither ALLOW nor deny, 957 * then continue. 958 */ 959 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 960 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 961 continue; 962 963 /* 964 * 2.D. Copy the original ACE into a second, adjacent ACE. 965 */ 966 copy = _acl_duplicate_entry(child_aclp, i); 967 968 /* 969 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 970 * is set. 971 */ 972 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 973 974 /* 975 * 2.F. On the second ACE, clear the following flags: 976 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 977 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 978 */ 979 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 980 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 981 ACL_ENTRY_INHERIT_ONLY); 982 983 /* 984 * 2.G. On the second ACE, if the type is ALLOW, 985 * an implementation MAY clear the following 986 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 987 */ 988 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 989 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 990 991 /* 992 * Increment the counter to skip the copied entry. 993 */ 994 i++; 995 } 996 997 /* 998 * 3. To ensure that the mode is honored, apply the algorithm describe 999 * in Section 2.16.6.3, using the mode that is to be used for file 1000 * creation. 1001 */ 1002 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1003 } 1004 #endif /* _KERNEL */ 1005 1006 /* 1007 * Populate the ACL with entries inherited from parent_aclp. 1008 */ 1009 static void 1010 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1011 struct acl *child_aclp, mode_t mode, int file_owner_id, 1012 int is_directory) 1013 { 1014 int i, flags, tag; 1015 const struct acl_entry *parent_entry; 1016 struct acl_entry *entry; 1017 1018 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1019 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1020 1021 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1022 parent_entry = &(parent_aclp->acl_entry[i]); 1023 flags = parent_entry->ae_flags; 1024 tag = parent_entry->ae_tag; 1025 1026 /* 1027 * Don't inherit owner@, group@, or everyone@ entries. 1028 */ 1029 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1030 tag == ACL_EVERYONE) 1031 continue; 1032 1033 /* 1034 * Entry is not inheritable at all. 1035 */ 1036 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1037 ACL_ENTRY_FILE_INHERIT)) == 0) 1038 continue; 1039 1040 /* 1041 * We're creating a file, but entry is not inheritable 1042 * by files. 1043 */ 1044 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1045 continue; 1046 1047 /* 1048 * Entry is inheritable only by files, but has NO_PROPAGATE 1049 * flag set, and we're creating a directory, so it wouldn't 1050 * propagate to any file in that directory anyway. 1051 */ 1052 if (is_directory && 1053 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1054 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1055 continue; 1056 1057 /* 1058 * Entry qualifies for being inherited. 1059 */ 1060 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1061 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1062 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1063 *entry = *parent_entry; 1064 child_aclp->acl_cnt++; 1065 1066 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1067 entry->ae_flags |= ACL_ENTRY_INHERITED; 1068 1069 /* 1070 * If the type of the ACE is neither ALLOW nor DENY, 1071 * then leave it as it is and proceed to the next one. 1072 */ 1073 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1074 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1075 continue; 1076 1077 /* 1078 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1079 * the object being created is not a directory, then clear 1080 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1081 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1082 * ACL_ENTRY_INHERIT_ONLY. 1083 */ 1084 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1085 !is_directory) { 1086 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1087 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1088 ACL_ENTRY_INHERIT_ONLY); 1089 } 1090 1091 /* 1092 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1093 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1094 * that ACL_ENTRY_INHERIT_ONLY is set. 1095 */ 1096 if (is_directory && 1097 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1098 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1099 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1100 } 1101 1102 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1103 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1104 /* 1105 * Some permissions must never be inherited. 1106 */ 1107 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1108 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1109 1110 /* 1111 * Others must be masked according to the file mode. 1112 */ 1113 if ((mode & S_IRGRP) == 0) 1114 entry->ae_perm &= ~ACL_READ_DATA; 1115 if ((mode & S_IWGRP) == 0) 1116 entry->ae_perm &= 1117 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1118 if ((mode & S_IXGRP) == 0) 1119 entry->ae_perm &= ~ACL_EXECUTE; 1120 } 1121 } 1122 } 1123 1124 /* 1125 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1126 * It's also being used to calculate a trivial ACL, by inheriting from 1127 * a NULL ACL. 1128 */ 1129 static void 1130 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1131 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1132 { 1133 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1134 acl_perm_t user_allow, group_allow, everyone_allow; 1135 1136 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1137 1138 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1139 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1140 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1141 ACL_WRITE_NAMED_ATTRS; 1142 1143 if (mode & S_IRUSR) 1144 user_allow |= ACL_READ_DATA; 1145 if (mode & S_IWUSR) 1146 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1147 if (mode & S_IXUSR) 1148 user_allow |= ACL_EXECUTE; 1149 1150 if (mode & S_IRGRP) 1151 group_allow |= ACL_READ_DATA; 1152 if (mode & S_IWGRP) 1153 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1154 if (mode & S_IXGRP) 1155 group_allow |= ACL_EXECUTE; 1156 1157 if (mode & S_IROTH) 1158 everyone_allow |= ACL_READ_DATA; 1159 if (mode & S_IWOTH) 1160 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1161 if (mode & S_IXOTH) 1162 everyone_allow |= ACL_EXECUTE; 1163 1164 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1165 group_deny = everyone_allow & ~group_allow; 1166 user_allow_first = group_deny & ~user_deny; 1167 1168 if (user_allow_first != 0) 1169 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1170 ACL_ENTRY_TYPE_ALLOW); 1171 if (user_deny != 0) 1172 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1173 ACL_ENTRY_TYPE_DENY); 1174 if (group_deny != 0) 1175 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1176 ACL_ENTRY_TYPE_DENY); 1177 1178 if (parent_aclp != NULL) 1179 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1180 file_owner_id, is_directory); 1181 1182 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1183 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1184 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1185 } 1186 1187 #ifdef _KERNEL 1188 void 1189 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1190 struct acl *child_aclp, mode_t mode, int file_owner_id, 1191 int is_directory) 1192 { 1193 1194 if (acl_nfs4_old_semantics) 1195 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1196 mode, file_owner_id, is_directory); 1197 else 1198 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1199 mode, file_owner_id, is_directory); 1200 } 1201 #endif /* _KERNEL */ 1202 1203 /* 1204 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1205 * Note that this results in an ACL different from (but semantically 1206 * equal to) the "canonical six" trivial ACL computed using algorithm 1207 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1208 */ 1209 static void 1210 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1211 { 1212 1213 aclp->acl_cnt = 0; 1214 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1215 } 1216 1217 #ifndef _KERNEL 1218 /* 1219 * This routine is used by libc to implement acl_strip_np(3) 1220 * and acl_is_trivial_np(3). 1221 */ 1222 void 1223 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1224 { 1225 1226 aclp->acl_cnt = 0; 1227 if (canonical_six) 1228 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1229 else 1230 acl_nfs4_trivial_from_mode(aclp, mode); 1231 } 1232 #endif /* !_KERNEL */ 1233 1234 #ifdef _KERNEL 1235 static int 1236 _acls_are_equal(const struct acl *a, const struct acl *b) 1237 { 1238 int i; 1239 const struct acl_entry *entrya, *entryb; 1240 1241 if (a->acl_cnt != b->acl_cnt) 1242 return (0); 1243 1244 for (i = 0; i < b->acl_cnt; i++) { 1245 entrya = &(a->acl_entry[i]); 1246 entryb = &(b->acl_entry[i]); 1247 1248 if (entrya->ae_tag != entryb->ae_tag || 1249 entrya->ae_id != entryb->ae_id || 1250 entrya->ae_perm != entryb->ae_perm || 1251 entrya->ae_entry_type != entryb->ae_entry_type || 1252 entrya->ae_flags != entryb->ae_flags) 1253 return (0); 1254 } 1255 1256 return (1); 1257 } 1258 1259 /* 1260 * This routine is used to determine whether to remove extended attribute 1261 * that stores ACL contents. 1262 */ 1263 int 1264 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1265 { 1266 int trivial; 1267 mode_t tmpmode = 0; 1268 struct acl *tmpaclp; 1269 1270 if (aclp->acl_cnt > 6) 1271 return (0); 1272 1273 /* 1274 * Compute the mode from the ACL, then compute new ACL from that mode. 1275 * If the ACLs are identical, then the ACL is trivial. 1276 * 1277 * XXX: I guess there is a faster way to do this. However, even 1278 * this slow implementation significantly speeds things up 1279 * for files that don't have non-trivial ACLs - it's critical 1280 * for performance to not use EA when they are not needed. 1281 * 1282 * First try the PSARC/2010/029 semantics. 1283 */ 1284 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1285 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1286 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1287 trivial = _acls_are_equal(aclp, tmpaclp); 1288 if (trivial) { 1289 acl_free(tmpaclp); 1290 return (trivial); 1291 } 1292 1293 /* 1294 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1295 */ 1296 tmpaclp->acl_cnt = 0; 1297 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1298 trivial = _acls_are_equal(aclp, tmpaclp); 1299 acl_free(tmpaclp); 1300 1301 return (trivial); 1302 } 1303 #endif /* _KERNEL */ 1304 1305 int 1306 acl_nfs4_check(const struct acl *aclp, int is_directory) 1307 { 1308 int i; 1309 const struct acl_entry *entry; 1310 1311 /* 1312 * The spec doesn't seem to say anything about ACL validity. 1313 * It seems there is not much to do here. There is even no need 1314 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1315 * entries, as there can be several of them and that's perfectly 1316 * valid. There can be none of them too. Really. 1317 */ 1318 1319 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1320 return (EINVAL); 1321 1322 for (i = 0; i < aclp->acl_cnt; i++) { 1323 entry = &(aclp->acl_entry[i]); 1324 1325 switch (entry->ae_tag) { 1326 case ACL_USER_OBJ: 1327 case ACL_GROUP_OBJ: 1328 case ACL_EVERYONE: 1329 if (entry->ae_id != ACL_UNDEFINED_ID) 1330 return (EINVAL); 1331 break; 1332 1333 case ACL_USER: 1334 case ACL_GROUP: 1335 if (entry->ae_id == ACL_UNDEFINED_ID) 1336 return (EINVAL); 1337 break; 1338 1339 default: 1340 return (EINVAL); 1341 } 1342 1343 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1344 return (EINVAL); 1345 1346 /* 1347 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1348 */ 1349 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1350 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1351 return (EINVAL); 1352 1353 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1354 return (EINVAL); 1355 1356 /* Disallow unimplemented flags. */ 1357 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1358 ACL_ENTRY_FAILED_ACCESS)) 1359 return (EINVAL); 1360 1361 /* Disallow flags not allowed for ordinary files. */ 1362 if (!is_directory) { 1363 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1364 ACL_ENTRY_DIRECTORY_INHERIT | 1365 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1366 return (EINVAL); 1367 } 1368 } 1369 1370 return (0); 1371 } 1372 1373 #ifdef _KERNEL 1374 static int 1375 acl_nfs4_modload(module_t module, int what, void *arg) 1376 { 1377 int ret; 1378 1379 ret = 0; 1380 1381 switch (what) { 1382 case MOD_LOAD: 1383 case MOD_SHUTDOWN: 1384 break; 1385 1386 case MOD_QUIESCE: 1387 /* XXX TODO */ 1388 ret = 0; 1389 break; 1390 1391 case MOD_UNLOAD: 1392 /* XXX TODO */ 1393 ret = 0; 1394 break; 1395 default: 1396 ret = EINVAL; 1397 break; 1398 } 1399 1400 return (ret); 1401 } 1402 1403 static moduledata_t acl_nfs4_mod = { 1404 "acl_nfs4", 1405 acl_nfs4_modload, 1406 NULL 1407 }; 1408 1409 /* 1410 * XXX TODO: which subsystem, order? 1411 */ 1412 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST); 1413 MODULE_VERSION(acl_nfs4, 1); 1414 #endif /* _KERNEL */ 1415