1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/systm.h> 32 #include <sys/sysmacros.h> 33 #include <sys/resource.h> 34 #include <sys/vfs.h> 35 #include <sys/vnode.h> 36 #include <sys/sid.h> 37 #include <sys/file.h> 38 #include <sys/stat.h> 39 #include <sys/kmem.h> 40 #include <sys/cmn_err.h> 41 #include <sys/errno.h> 42 #include <sys/unistd.h> 43 #include <sys/sdt.h> 44 #include <sys/fs/zfs.h> 45 #include <sys/mode.h> 46 #include <sys/policy.h> 47 #include <sys/zfs_znode.h> 48 #include <sys/zfs_fuid.h> 49 #include <sys/zfs_acl.h> 50 #include <sys/zfs_dir.h> 51 #include <sys/zfs_vfsops.h> 52 #include <sys/dmu.h> 53 #include <sys/dnode.h> 54 #include <sys/zap.h> 55 #include "fs/fs_subr.h" 56 #include <acl/acl_common.h> 57 58 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE 59 #define DENY ACE_ACCESS_DENIED_ACE_TYPE 60 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 61 62 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP) 63 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \ 64 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE) 65 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \ 66 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 67 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \ 68 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 69 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS) 70 71 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \ 72 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \ 73 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \ 74 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE) 75 76 #define WRITE_MASK (WRITE_MASK_DATA|ACE_WRITE_ATTRIBUTES|ACE_WRITE_ACL|\ 77 ACE_WRITE_OWNER) 78 79 #define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 80 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 81 82 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 83 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 84 85 #define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \ 86 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE) 87 88 #define SECURE_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER) 89 90 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\ 91 ZFS_ACL_PROTECTED) 92 93 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\ 94 ZFS_ACL_OBJ_ACE) 95 96 static uint16_t 97 zfs_ace_v0_get_type(void *acep) 98 { 99 return (((zfs_oldace_t *)acep)->z_type); 100 } 101 102 static uint16_t 103 zfs_ace_v0_get_flags(void *acep) 104 { 105 return (((zfs_oldace_t *)acep)->z_flags); 106 } 107 108 static uint32_t 109 zfs_ace_v0_get_mask(void *acep) 110 { 111 return (((zfs_oldace_t *)acep)->z_access_mask); 112 } 113 114 static uint64_t 115 zfs_ace_v0_get_who(void *acep) 116 { 117 return (((zfs_oldace_t *)acep)->z_fuid); 118 } 119 120 static void 121 zfs_ace_v0_set_type(void *acep, uint16_t type) 122 { 123 ((zfs_oldace_t *)acep)->z_type = type; 124 } 125 126 static void 127 zfs_ace_v0_set_flags(void *acep, uint16_t flags) 128 { 129 ((zfs_oldace_t *)acep)->z_flags = flags; 130 } 131 132 static void 133 zfs_ace_v0_set_mask(void *acep, uint32_t mask) 134 { 135 ((zfs_oldace_t *)acep)->z_access_mask = mask; 136 } 137 138 static void 139 zfs_ace_v0_set_who(void *acep, uint64_t who) 140 { 141 ((zfs_oldace_t *)acep)->z_fuid = who; 142 } 143 144 /*ARGSUSED*/ 145 static size_t 146 zfs_ace_v0_size(void *acep) 147 { 148 return (sizeof (zfs_oldace_t)); 149 } 150 151 static size_t 152 zfs_ace_v0_abstract_size(void) 153 { 154 return (sizeof (zfs_oldace_t)); 155 } 156 157 static int 158 zfs_ace_v0_mask_off(void) 159 { 160 return (offsetof(zfs_oldace_t, z_access_mask)); 161 } 162 163 /*ARGSUSED*/ 164 static int 165 zfs_ace_v0_data(void *acep, void **datap) 166 { 167 *datap = NULL; 168 return (0); 169 } 170 171 static acl_ops_t zfs_acl_v0_ops = { 172 zfs_ace_v0_get_mask, 173 zfs_ace_v0_set_mask, 174 zfs_ace_v0_get_flags, 175 zfs_ace_v0_set_flags, 176 zfs_ace_v0_get_type, 177 zfs_ace_v0_set_type, 178 zfs_ace_v0_get_who, 179 zfs_ace_v0_set_who, 180 zfs_ace_v0_size, 181 zfs_ace_v0_abstract_size, 182 zfs_ace_v0_mask_off, 183 zfs_ace_v0_data 184 }; 185 186 static uint16_t 187 zfs_ace_fuid_get_type(void *acep) 188 { 189 return (((zfs_ace_hdr_t *)acep)->z_type); 190 } 191 192 static uint16_t 193 zfs_ace_fuid_get_flags(void *acep) 194 { 195 return (((zfs_ace_hdr_t *)acep)->z_flags); 196 } 197 198 static uint32_t 199 zfs_ace_fuid_get_mask(void *acep) 200 { 201 return (((zfs_ace_hdr_t *)acep)->z_access_mask); 202 } 203 204 static uint64_t 205 zfs_ace_fuid_get_who(void *args) 206 { 207 uint16_t entry_type; 208 zfs_ace_t *acep = args; 209 210 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 211 212 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 213 entry_type == ACE_EVERYONE) 214 return (-1); 215 return (((zfs_ace_t *)acep)->z_fuid); 216 } 217 218 static void 219 zfs_ace_fuid_set_type(void *acep, uint16_t type) 220 { 221 ((zfs_ace_hdr_t *)acep)->z_type = type; 222 } 223 224 static void 225 zfs_ace_fuid_set_flags(void *acep, uint16_t flags) 226 { 227 ((zfs_ace_hdr_t *)acep)->z_flags = flags; 228 } 229 230 static void 231 zfs_ace_fuid_set_mask(void *acep, uint32_t mask) 232 { 233 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask; 234 } 235 236 static void 237 zfs_ace_fuid_set_who(void *arg, uint64_t who) 238 { 239 zfs_ace_t *acep = arg; 240 241 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 242 243 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 244 entry_type == ACE_EVERYONE) 245 return; 246 acep->z_fuid = who; 247 } 248 249 static size_t 250 zfs_ace_fuid_size(void *acep) 251 { 252 zfs_ace_hdr_t *zacep = acep; 253 uint16_t entry_type; 254 255 switch (zacep->z_type) { 256 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 257 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 258 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 259 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 260 return (sizeof (zfs_object_ace_t)); 261 case ALLOW: 262 case DENY: 263 entry_type = 264 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS); 265 if (entry_type == ACE_OWNER || 266 entry_type == (ACE_GROUP | ACE_IDENTIFIER_GROUP) || 267 entry_type == ACE_EVERYONE) 268 return (sizeof (zfs_ace_hdr_t)); 269 /*FALLTHROUGH*/ 270 default: 271 return (sizeof (zfs_ace_t)); 272 } 273 } 274 275 static size_t 276 zfs_ace_fuid_abstract_size(void) 277 { 278 return (sizeof (zfs_ace_hdr_t)); 279 } 280 281 static int 282 zfs_ace_fuid_mask_off(void) 283 { 284 return (offsetof(zfs_ace_hdr_t, z_access_mask)); 285 } 286 287 static int 288 zfs_ace_fuid_data(void *acep, void **datap) 289 { 290 zfs_ace_t *zacep = acep; 291 zfs_object_ace_t *zobjp; 292 293 switch (zacep->z_hdr.z_type) { 294 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 295 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 296 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 297 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 298 zobjp = acep; 299 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t); 300 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t)); 301 default: 302 *datap = NULL; 303 return (0); 304 } 305 } 306 307 static acl_ops_t zfs_acl_fuid_ops = { 308 zfs_ace_fuid_get_mask, 309 zfs_ace_fuid_set_mask, 310 zfs_ace_fuid_get_flags, 311 zfs_ace_fuid_set_flags, 312 zfs_ace_fuid_get_type, 313 zfs_ace_fuid_set_type, 314 zfs_ace_fuid_get_who, 315 zfs_ace_fuid_set_who, 316 zfs_ace_fuid_size, 317 zfs_ace_fuid_abstract_size, 318 zfs_ace_fuid_mask_off, 319 zfs_ace_fuid_data 320 }; 321 322 static int 323 zfs_acl_version(int version) 324 { 325 if (version < ZPL_VERSION_FUID) 326 return (ZFS_ACL_VERSION_INITIAL); 327 else 328 return (ZFS_ACL_VERSION_FUID); 329 } 330 331 static int 332 zfs_acl_version_zp(znode_t *zp) 333 { 334 return (zfs_acl_version(zp->z_zfsvfs->z_version)); 335 } 336 337 static zfs_acl_t * 338 zfs_acl_alloc(int vers) 339 { 340 zfs_acl_t *aclp; 341 342 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP); 343 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t), 344 offsetof(zfs_acl_node_t, z_next)); 345 aclp->z_version = vers; 346 if (vers == ZFS_ACL_VERSION_FUID) 347 aclp->z_ops = zfs_acl_fuid_ops; 348 else 349 aclp->z_ops = zfs_acl_v0_ops; 350 return (aclp); 351 } 352 353 static zfs_acl_node_t * 354 zfs_acl_node_alloc(size_t bytes) 355 { 356 zfs_acl_node_t *aclnode; 357 358 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP); 359 if (bytes) { 360 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP); 361 aclnode->z_allocdata = aclnode->z_acldata; 362 aclnode->z_allocsize = bytes; 363 aclnode->z_size = bytes; 364 } 365 366 return (aclnode); 367 } 368 369 static void 370 zfs_acl_node_free(zfs_acl_node_t *aclnode) 371 { 372 if (aclnode->z_allocsize) 373 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize); 374 kmem_free(aclnode, sizeof (zfs_acl_node_t)); 375 } 376 377 static void 378 zfs_acl_release_nodes(zfs_acl_t *aclp) 379 { 380 zfs_acl_node_t *aclnode; 381 382 while (aclnode = list_head(&aclp->z_acl)) { 383 list_remove(&aclp->z_acl, aclnode); 384 zfs_acl_node_free(aclnode); 385 } 386 aclp->z_acl_count = 0; 387 aclp->z_acl_bytes = 0; 388 } 389 390 void 391 zfs_acl_free(zfs_acl_t *aclp) 392 { 393 zfs_acl_release_nodes(aclp); 394 list_destroy(&aclp->z_acl); 395 kmem_free(aclp, sizeof (zfs_acl_t)); 396 } 397 398 static boolean_t 399 zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags) 400 { 401 /* 402 * first check type of entry 403 */ 404 405 switch (iflags & ACE_TYPE_FLAGS) { 406 case ACE_OWNER: 407 case (ACE_IDENTIFIER_GROUP | ACE_GROUP): 408 case ACE_IDENTIFIER_GROUP: 409 case ACE_EVERYONE: 410 case 0: /* User entry */ 411 break; 412 default: 413 return (B_FALSE); 414 415 } 416 417 /* 418 * next check inheritance level flags 419 */ 420 421 if (type != ALLOW && type > MAX_ACE_TYPE) { 422 return (B_FALSE); 423 } 424 425 switch (type) { 426 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 427 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 428 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 429 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 430 if (aclp->z_version < ZFS_ACL_VERSION_FUID) 431 return (B_FALSE); 432 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 433 } 434 435 /* 436 * Only directories should have inheritance flags. 437 */ 438 if (obj_type != VDIR && (iflags & 439 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE| 440 ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE))) { 441 return (B_FALSE); 442 } 443 444 if (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)) 445 aclp->z_hints |= ZFS_INHERIT_ACE; 446 447 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) { 448 if ((iflags & (ACE_FILE_INHERIT_ACE| 449 ACE_DIRECTORY_INHERIT_ACE)) == 0) { 450 return (B_FALSE); 451 } 452 } 453 454 return (B_TRUE); 455 } 456 457 static void * 458 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who, 459 uint32_t *access_mask, uint16_t *iflags, uint16_t *type) 460 { 461 zfs_acl_node_t *aclnode; 462 463 if (start == NULL) { 464 aclnode = list_head(&aclp->z_acl); 465 if (aclnode == NULL) 466 return (NULL); 467 468 aclp->z_next_ace = aclnode->z_acldata; 469 aclp->z_curr_node = aclnode; 470 aclnode->z_ace_idx = 0; 471 } 472 473 aclnode = aclp->z_curr_node; 474 475 if (aclnode == NULL) 476 return (NULL); 477 478 if (aclnode->z_ace_idx >= aclnode->z_ace_count) { 479 aclnode = list_next(&aclp->z_acl, aclnode); 480 if (aclnode == NULL) 481 return (NULL); 482 else { 483 aclp->z_curr_node = aclnode; 484 aclnode->z_ace_idx = 0; 485 aclp->z_next_ace = aclnode->z_acldata; 486 } 487 } 488 489 if (aclnode->z_ace_idx < aclnode->z_ace_count) { 490 void *acep = aclp->z_next_ace; 491 *iflags = aclp->z_ops.ace_flags_get(acep); 492 *type = aclp->z_ops.ace_type_get(acep); 493 *access_mask = aclp->z_ops.ace_mask_get(acep); 494 *who = aclp->z_ops.ace_who_get(acep); 495 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + 496 aclp->z_ops.ace_size(acep); 497 aclnode->z_ace_idx++; 498 return ((void *)acep); 499 } 500 return (NULL); 501 } 502 503 /*ARGSUSED*/ 504 static uint64_t 505 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt, 506 uint16_t *flags, uint16_t *type, uint32_t *mask) 507 { 508 zfs_acl_t *aclp = datap; 509 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie; 510 uint64_t who; 511 512 acep = zfs_acl_next_ace(aclp, acep, &who, mask, 513 flags, type); 514 return ((uint64_t)(uintptr_t)acep); 515 } 516 517 static zfs_acl_node_t * 518 zfs_acl_curr_node(zfs_acl_t *aclp) 519 { 520 ASSERT(aclp->z_curr_node); 521 return (aclp->z_curr_node); 522 } 523 524 /* 525 * Copy ACE to internal ZFS format. 526 * While processing the ACL each ACE will be validated for correctness. 527 * ACE FUIDs will be created later. 528 */ 529 int 530 zfs_copy_ace_2_fuid(vtype_t obj_type, zfs_acl_t *aclp, void *datap, 531 zfs_ace_t *z_acl, int aclcnt, size_t *size) 532 { 533 int i; 534 uint16_t entry_type; 535 zfs_ace_t *aceptr = z_acl; 536 ace_t *acep = datap; 537 zfs_object_ace_t *zobjacep; 538 ace_object_t *aceobjp; 539 540 for (i = 0; i != aclcnt; i++) { 541 aceptr->z_hdr.z_access_mask = acep->a_access_mask; 542 aceptr->z_hdr.z_flags = acep->a_flags; 543 aceptr->z_hdr.z_type = acep->a_type; 544 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS; 545 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP && 546 entry_type != ACE_EVERYONE) 547 aceptr->z_fuid = (uint64_t)acep->a_who; 548 /* 549 * Make sure ACE is valid 550 */ 551 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type, 552 aceptr->z_hdr.z_flags) != B_TRUE) 553 return (EINVAL); 554 555 switch (acep->a_type) { 556 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 557 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 558 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 559 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 560 zobjacep = (zfs_object_ace_t *)aceptr; 561 aceobjp = (ace_object_t *)acep; 562 563 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type, 564 sizeof (aceobjp->a_obj_type)); 565 bcopy(aceobjp->a_inherit_obj_type, 566 zobjacep->z_inherit_type, 567 sizeof (aceobjp->a_inherit_obj_type)); 568 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t)); 569 break; 570 default: 571 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t)); 572 } 573 574 aceptr = (zfs_ace_t *)((caddr_t)aceptr + 575 aclp->z_ops.ace_size(aceptr)); 576 } 577 578 *size = (caddr_t)aceptr - (caddr_t)z_acl; 579 580 return (0); 581 } 582 583 /* 584 * Copy ZFS ACEs to fixed size ace_t layout 585 */ 586 static void 587 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *datap, int filter) 588 { 589 uint64_t who; 590 uint32_t access_mask; 591 uint16_t iflags, type; 592 zfs_ace_hdr_t *zacep = NULL; 593 ace_t *acep = datap; 594 ace_object_t *objacep; 595 zfs_object_ace_t *zobjacep; 596 zfs_fuid_hdl_t hdl = { 0 }; 597 size_t ace_size; 598 uint16_t entry_type; 599 600 while (zacep = zfs_acl_next_ace(aclp, zacep, 601 &who, &access_mask, &iflags, &type)) { 602 603 switch (type) { 604 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 605 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 606 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 607 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 608 if (filter) { 609 continue; 610 } 611 zobjacep = (zfs_object_ace_t *)zacep; 612 objacep = (ace_object_t *)acep; 613 bcopy(zobjacep->z_object_type, 614 objacep->a_obj_type, 615 sizeof (zobjacep->z_object_type)); 616 bcopy(zobjacep->z_inherit_type, 617 objacep->a_inherit_obj_type, 618 sizeof (zobjacep->z_inherit_type)); 619 ace_size = sizeof (ace_object_t); 620 break; 621 default: 622 ace_size = sizeof (ace_t); 623 break; 624 } 625 626 entry_type = (iflags & ACE_TYPE_FLAGS); 627 if ((entry_type != ACE_OWNER && 628 entry_type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 629 entry_type != ACE_EVERYONE)) 630 zfs_fuid_queue_map_id(zfsvfs, &hdl, who, 631 (entry_type & ACE_IDENTIFIER_GROUP) ? 632 ZFS_ACE_GROUP : ZFS_ACE_USER, &acep->a_who); 633 else 634 acep->a_who = (uid_t)(int64_t)who; 635 acep->a_access_mask = access_mask; 636 acep->a_flags = iflags; 637 acep->a_type = type; 638 acep = (ace_t *)((caddr_t)acep + ace_size); 639 } 640 zfs_fuid_get_mappings(&hdl); 641 } 642 643 static int 644 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep, 645 zfs_oldace_t *z_acl, int aclcnt, size_t *size) 646 { 647 int i; 648 zfs_oldace_t *aceptr = z_acl; 649 650 for (i = 0; i != aclcnt; i++, aceptr++) { 651 aceptr->z_access_mask = acep[i].a_access_mask; 652 aceptr->z_type = acep[i].a_type; 653 aceptr->z_flags = acep[i].a_flags; 654 aceptr->z_fuid = acep[i].a_who; 655 /* 656 * Make sure ACE is valid 657 */ 658 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type, 659 aceptr->z_flags) != B_TRUE) 660 return (EINVAL); 661 } 662 *size = (caddr_t)aceptr - (caddr_t)z_acl; 663 return (0); 664 } 665 666 /* 667 * convert old ACL format to new 668 */ 669 void 670 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp) 671 { 672 zfs_oldace_t *oldaclp; 673 int i; 674 uint16_t type, iflags; 675 uint32_t access_mask; 676 uint64_t who; 677 void *cookie = NULL; 678 zfs_acl_node_t *newaclnode; 679 680 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL); 681 /* 682 * First create the ACE in a contiguous piece of memory 683 * for zfs_copy_ace_2_fuid(). 684 * 685 * We only convert an ACL once, so this won't happen 686 * everytime. 687 */ 688 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count, 689 KM_SLEEP); 690 i = 0; 691 while (cookie = zfs_acl_next_ace(aclp, cookie, &who, 692 &access_mask, &iflags, &type)) { 693 oldaclp[i].z_flags = iflags; 694 oldaclp[i].z_type = type; 695 oldaclp[i].z_fuid = who; 696 oldaclp[i++].z_access_mask = access_mask; 697 } 698 699 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count * 700 sizeof (zfs_object_ace_t)); 701 aclp->z_ops = zfs_acl_fuid_ops; 702 VERIFY(zfs_copy_ace_2_fuid(ZTOV(zp)->v_type, aclp, oldaclp, 703 newaclnode->z_acldata, aclp->z_acl_count, 704 &newaclnode->z_size) == 0); 705 newaclnode->z_ace_count = aclp->z_acl_count; 706 aclp->z_version = ZFS_ACL_VERSION; 707 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t)); 708 709 /* 710 * Release all previous ACL nodes 711 */ 712 713 zfs_acl_release_nodes(aclp); 714 715 list_insert_head(&aclp->z_acl, newaclnode); 716 717 aclp->z_acl_bytes = newaclnode->z_size; 718 aclp->z_acl_count = newaclnode->z_ace_count; 719 720 } 721 722 /* 723 * Convert unix access mask to v4 access mask 724 */ 725 static uint32_t 726 zfs_unix_to_v4(uint32_t access_mask) 727 { 728 uint32_t new_mask = 0; 729 730 if (access_mask & S_IXOTH) 731 new_mask |= ACE_EXECUTE; 732 if (access_mask & S_IWOTH) 733 new_mask |= ACE_WRITE_DATA; 734 if (access_mask & S_IROTH) 735 new_mask |= ACE_READ_DATA; 736 return (new_mask); 737 } 738 739 static void 740 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask, 741 uint16_t access_type, uint64_t fuid, uint16_t entry_type) 742 { 743 uint16_t type = entry_type & ACE_TYPE_FLAGS; 744 745 aclp->z_ops.ace_mask_set(acep, access_mask); 746 aclp->z_ops.ace_type_set(acep, access_type); 747 aclp->z_ops.ace_flags_set(acep, entry_type); 748 if ((type != ACE_OWNER && type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 749 type != ACE_EVERYONE)) 750 aclp->z_ops.ace_who_set(acep, fuid); 751 } 752 753 /* 754 * Determine mode of file based on ACL. 755 * Also, create FUIDs for any User/Group ACEs 756 */ 757 static uint64_t 758 zfs_mode_fuid_compute(znode_t *zp, zfs_acl_t *aclp, zfs_fuid_info_t **fuidp, 759 dmu_tx_t *tx) 760 { 761 int entry_type; 762 mode_t mode; 763 mode_t seen = 0; 764 zfs_ace_hdr_t *acep = NULL; 765 uint64_t who; 766 uint16_t iflags, type; 767 uint32_t access_mask; 768 769 mode = (zp->z_phys->zp_mode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX)); 770 771 while (acep = zfs_acl_next_ace(aclp, acep, &who, 772 &access_mask, &iflags, &type)) { 773 774 /* 775 * Skip over inherit only ACEs 776 */ 777 if (iflags & ACE_INHERIT_ONLY_ACE) 778 continue; 779 780 entry_type = (iflags & ACE_TYPE_FLAGS); 781 782 if (entry_type == ACE_OWNER) { 783 if ((access_mask & ACE_READ_DATA) && 784 (!(seen & S_IRUSR))) { 785 seen |= S_IRUSR; 786 if (type == ALLOW) { 787 mode |= S_IRUSR; 788 } 789 } 790 if ((access_mask & ACE_WRITE_DATA) && 791 (!(seen & S_IWUSR))) { 792 seen |= S_IWUSR; 793 if (type == ALLOW) { 794 mode |= S_IWUSR; 795 } 796 } 797 if ((access_mask & ACE_EXECUTE) && 798 (!(seen & S_IXUSR))) { 799 seen |= S_IXUSR; 800 if (type == ALLOW) { 801 mode |= S_IXUSR; 802 } 803 } 804 } else if (entry_type == OWNING_GROUP) { 805 if ((access_mask & ACE_READ_DATA) && 806 (!(seen & S_IRGRP))) { 807 seen |= S_IRGRP; 808 if (type == ALLOW) { 809 mode |= S_IRGRP; 810 } 811 } 812 if ((access_mask & ACE_WRITE_DATA) && 813 (!(seen & S_IWGRP))) { 814 seen |= S_IWGRP; 815 if (type == ALLOW) { 816 mode |= S_IWGRP; 817 } 818 } 819 if ((access_mask & ACE_EXECUTE) && 820 (!(seen & S_IXGRP))) { 821 seen |= S_IXGRP; 822 if (type == ALLOW) { 823 mode |= S_IXGRP; 824 } 825 } 826 } else if (entry_type == ACE_EVERYONE) { 827 if ((access_mask & ACE_READ_DATA)) { 828 if (!(seen & S_IRUSR)) { 829 seen |= S_IRUSR; 830 if (type == ALLOW) { 831 mode |= S_IRUSR; 832 } 833 } 834 if (!(seen & S_IRGRP)) { 835 seen |= S_IRGRP; 836 if (type == ALLOW) { 837 mode |= S_IRGRP; 838 } 839 } 840 if (!(seen & S_IROTH)) { 841 seen |= S_IROTH; 842 if (type == ALLOW) { 843 mode |= S_IROTH; 844 } 845 } 846 } 847 if ((access_mask & ACE_WRITE_DATA)) { 848 if (!(seen & S_IWUSR)) { 849 seen |= S_IWUSR; 850 if (type == ALLOW) { 851 mode |= S_IWUSR; 852 } 853 } 854 if (!(seen & S_IWGRP)) { 855 seen |= S_IWGRP; 856 if (type == ALLOW) { 857 mode |= S_IWGRP; 858 } 859 } 860 if (!(seen & S_IWOTH)) { 861 seen |= S_IWOTH; 862 if (type == ALLOW) { 863 mode |= S_IWOTH; 864 } 865 } 866 } 867 if ((access_mask & ACE_EXECUTE)) { 868 if (!(seen & S_IXUSR)) { 869 seen |= S_IXUSR; 870 if (type == ALLOW) { 871 mode |= S_IXUSR; 872 } 873 } 874 if (!(seen & S_IXGRP)) { 875 seen |= S_IXGRP; 876 if (type == ALLOW) { 877 mode |= S_IXGRP; 878 } 879 } 880 if (!(seen & S_IXOTH)) { 881 seen |= S_IXOTH; 882 if (type == ALLOW) { 883 mode |= S_IXOTH; 884 } 885 } 886 } 887 } 888 /* 889 * Now handle FUID create for user/group ACEs 890 */ 891 if (entry_type == 0 || entry_type == ACE_IDENTIFIER_GROUP) { 892 aclp->z_ops.ace_who_set(acep, 893 zfs_fuid_create(zp->z_zfsvfs, who, 894 entry_type == 0 ? ZFS_ACE_USER : ZFS_ACE_GROUP, tx, 895 fuidp)); 896 } 897 } 898 return (mode); 899 } 900 901 static zfs_acl_t * 902 zfs_acl_node_read_internal(znode_t *zp, boolean_t will_modify) 903 { 904 zfs_acl_t *aclp; 905 zfs_acl_node_t *aclnode; 906 907 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 908 909 /* 910 * Version 0 to 1 znode_acl_phys has the size/count fields swapped. 911 * Version 0 didn't have a size field, only a count. 912 */ 913 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 914 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_size; 915 aclp->z_acl_bytes = ZFS_ACL_SIZE(aclp->z_acl_count); 916 } else { 917 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count; 918 aclp->z_acl_bytes = zp->z_phys->zp_acl.z_acl_size; 919 } 920 921 aclnode = zfs_acl_node_alloc(will_modify ? aclp->z_acl_bytes : 0); 922 aclnode->z_ace_count = aclp->z_acl_count; 923 if (will_modify) { 924 bcopy(zp->z_phys->zp_acl.z_ace_data, aclnode->z_acldata, 925 aclp->z_acl_bytes); 926 } else { 927 aclnode->z_size = aclp->z_acl_bytes; 928 aclnode->z_acldata = &zp->z_phys->zp_acl.z_ace_data[0]; 929 } 930 931 list_insert_head(&aclp->z_acl, aclnode); 932 933 return (aclp); 934 } 935 936 /* 937 * Read an external acl object. 938 */ 939 static int 940 zfs_acl_node_read(znode_t *zp, zfs_acl_t **aclpp, boolean_t will_modify) 941 { 942 uint64_t extacl = zp->z_phys->zp_acl.z_acl_extern_obj; 943 zfs_acl_t *aclp; 944 size_t aclsize; 945 size_t acl_count; 946 zfs_acl_node_t *aclnode; 947 int error; 948 949 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 950 951 if (zp->z_phys->zp_acl.z_acl_extern_obj == 0) { 952 *aclpp = zfs_acl_node_read_internal(zp, will_modify); 953 return (0); 954 } 955 956 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 957 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 958 zfs_acl_phys_v0_t *zacl0 = 959 (zfs_acl_phys_v0_t *)&zp->z_phys->zp_acl; 960 961 aclsize = ZFS_ACL_SIZE(zacl0->z_acl_count); 962 acl_count = zacl0->z_acl_count; 963 } else { 964 aclsize = zp->z_phys->zp_acl.z_acl_size; 965 acl_count = zp->z_phys->zp_acl.z_acl_count; 966 if (aclsize == 0) 967 aclsize = acl_count * sizeof (zfs_ace_t); 968 } 969 aclnode = zfs_acl_node_alloc(aclsize); 970 list_insert_head(&aclp->z_acl, aclnode); 971 error = dmu_read(zp->z_zfsvfs->z_os, extacl, 0, 972 aclsize, aclnode->z_acldata); 973 aclnode->z_ace_count = acl_count; 974 aclp->z_acl_count = acl_count; 975 aclp->z_acl_bytes = aclsize; 976 977 if (error != 0) { 978 zfs_acl_free(aclp); 979 return (error); 980 } 981 982 *aclpp = aclp; 983 return (0); 984 } 985 986 /* 987 * common code for setting ACLs. 988 * 989 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl. 990 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's 991 * already checked the acl and knows whether to inherit. 992 */ 993 int 994 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, zfs_fuid_info_t **fuidp, 995 dmu_tx_t *tx) 996 { 997 int error; 998 znode_phys_t *zphys = zp->z_phys; 999 zfs_acl_phys_t *zacl = &zphys->zp_acl; 1000 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1001 uint64_t aoid = zphys->zp_acl.z_acl_extern_obj; 1002 uint64_t off = 0; 1003 dmu_object_type_t otype; 1004 zfs_acl_node_t *aclnode; 1005 1006 ASSERT(MUTEX_HELD(&zp->z_lock)); 1007 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1008 1009 dmu_buf_will_dirty(zp->z_dbuf, tx); 1010 1011 zphys->zp_mode = zfs_mode_fuid_compute(zp, aclp, fuidp, tx); 1012 1013 /* 1014 * Decide which opbject type to use. If we are forced to 1015 * use old ACL format than transform ACL into zfs_oldace_t 1016 * layout. 1017 */ 1018 if (!zfsvfs->z_use_fuids) { 1019 otype = DMU_OT_OLDACL; 1020 } else { 1021 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) && 1022 (zfsvfs->z_version >= ZPL_VERSION_FUID)) 1023 zfs_acl_xform(zp, aclp); 1024 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID); 1025 otype = DMU_OT_ACL; 1026 } 1027 1028 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1029 /* 1030 * If ACL was previously external and we are now 1031 * converting to new ACL format then release old 1032 * ACL object and create a new one. 1033 */ 1034 if (aoid && aclp->z_version != zacl->z_acl_version) { 1035 error = dmu_object_free(zfsvfs->z_os, 1036 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1037 if (error) 1038 return (error); 1039 aoid = 0; 1040 } 1041 if (aoid == 0) { 1042 aoid = dmu_object_alloc(zfsvfs->z_os, 1043 otype, aclp->z_acl_bytes, 1044 otype == DMU_OT_ACL ? DMU_OT_SYSACL : DMU_OT_NONE, 1045 otype == DMU_OT_ACL ? DN_MAX_BONUSLEN : 0, tx); 1046 } else { 1047 (void) dmu_object_set_blocksize(zfsvfs->z_os, aoid, 1048 aclp->z_acl_bytes, 0, tx); 1049 } 1050 zphys->zp_acl.z_acl_extern_obj = aoid; 1051 for (aclnode = list_head(&aclp->z_acl); aclnode; 1052 aclnode = list_next(&aclp->z_acl, aclnode)) { 1053 if (aclnode->z_ace_count == 0) 1054 continue; 1055 dmu_write(zfsvfs->z_os, aoid, off, 1056 aclnode->z_size, aclnode->z_acldata, tx); 1057 off += aclnode->z_size; 1058 } 1059 } else { 1060 void *start = zacl->z_ace_data; 1061 /* 1062 * Migrating back embedded? 1063 */ 1064 if (zphys->zp_acl.z_acl_extern_obj) { 1065 error = dmu_object_free(zfsvfs->z_os, 1066 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1067 if (error) 1068 return (error); 1069 zphys->zp_acl.z_acl_extern_obj = 0; 1070 } 1071 1072 for (aclnode = list_head(&aclp->z_acl); aclnode; 1073 aclnode = list_next(&aclp->z_acl, aclnode)) { 1074 if (aclnode->z_ace_count == 0) 1075 continue; 1076 bcopy(aclnode->z_acldata, start, aclnode->z_size); 1077 start = (caddr_t)start + aclnode->z_size; 1078 } 1079 } 1080 1081 /* 1082 * If Old version then swap count/bytes to match old 1083 * layout of znode_acl_phys_t. 1084 */ 1085 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1086 zphys->zp_acl.z_acl_size = aclp->z_acl_count; 1087 zphys->zp_acl.z_acl_count = aclp->z_acl_bytes; 1088 } else { 1089 zphys->zp_acl.z_acl_size = aclp->z_acl_bytes; 1090 zphys->zp_acl.z_acl_count = aclp->z_acl_count; 1091 } 1092 1093 zphys->zp_acl.z_acl_version = aclp->z_version; 1094 1095 /* 1096 * Replace ACL wide bits, but first clear them. 1097 */ 1098 zp->z_phys->zp_flags &= ~ZFS_ACL_WIDE_FLAGS; 1099 1100 zp->z_phys->zp_flags |= aclp->z_hints; 1101 1102 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0) 1103 zp->z_phys->zp_flags |= ZFS_ACL_TRIVIAL; 1104 1105 zfs_time_stamper_locked(zp, STATE_CHANGED, tx); 1106 return (0); 1107 } 1108 1109 /* 1110 * Update access mask for prepended ACE 1111 * 1112 * This applies the "groupmask" value for aclmode property. 1113 */ 1114 static void 1115 zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep, 1116 mode_t mode, uint64_t owner) 1117 { 1118 int rmask, wmask, xmask; 1119 int user_ace; 1120 uint16_t aceflags; 1121 uint32_t origmask, acepmask; 1122 uint64_t fuid; 1123 1124 aceflags = aclp->z_ops.ace_flags_get(acep); 1125 fuid = aclp->z_ops.ace_who_get(acep); 1126 origmask = aclp->z_ops.ace_mask_get(origacep); 1127 acepmask = aclp->z_ops.ace_mask_get(acep); 1128 1129 user_ace = (!(aceflags & 1130 (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP))); 1131 1132 if (user_ace && (fuid == owner)) { 1133 rmask = S_IRUSR; 1134 wmask = S_IWUSR; 1135 xmask = S_IXUSR; 1136 } else { 1137 rmask = S_IRGRP; 1138 wmask = S_IWGRP; 1139 xmask = S_IXGRP; 1140 } 1141 1142 if (origmask & ACE_READ_DATA) { 1143 if (mode & rmask) { 1144 acepmask &= ~ACE_READ_DATA; 1145 } else { 1146 acepmask |= ACE_READ_DATA; 1147 } 1148 } 1149 1150 if (origmask & ACE_WRITE_DATA) { 1151 if (mode & wmask) { 1152 acepmask &= ~ACE_WRITE_DATA; 1153 } else { 1154 acepmask |= ACE_WRITE_DATA; 1155 } 1156 } 1157 1158 if (origmask & ACE_APPEND_DATA) { 1159 if (mode & wmask) { 1160 acepmask &= ~ACE_APPEND_DATA; 1161 } else { 1162 acepmask |= ACE_APPEND_DATA; 1163 } 1164 } 1165 1166 if (origmask & ACE_EXECUTE) { 1167 if (mode & xmask) { 1168 acepmask &= ~ACE_EXECUTE; 1169 } else { 1170 acepmask |= ACE_EXECUTE; 1171 } 1172 } 1173 aclp->z_ops.ace_mask_set(acep, acepmask); 1174 } 1175 1176 /* 1177 * Apply mode to canonical six ACEs. 1178 */ 1179 static void 1180 zfs_acl_fixup_canonical_six(zfs_acl_t *aclp, mode_t mode) 1181 { 1182 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1183 void *acep; 1184 int maskoff = aclp->z_ops.ace_mask_off(); 1185 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1186 1187 ASSERT(aclnode != NULL); 1188 1189 acep = (void *)((caddr_t)aclnode->z_acldata + 1190 aclnode->z_size - (abstract_size * 6)); 1191 1192 /* 1193 * Fixup final ACEs to match the mode 1194 */ 1195 1196 adjust_ace_pair_common(acep, maskoff, abstract_size, 1197 (mode & 0700) >> 6); /* owner@ */ 1198 1199 acep = (caddr_t)acep + (abstract_size * 2); 1200 1201 adjust_ace_pair_common(acep, maskoff, abstract_size, 1202 (mode & 0070) >> 3); /* group@ */ 1203 1204 acep = (caddr_t)acep + (abstract_size * 2); 1205 adjust_ace_pair_common(acep, maskoff, 1206 abstract_size, mode); /* everyone@ */ 1207 } 1208 1209 1210 static int 1211 zfs_acl_ace_match(zfs_acl_t *aclp, void *acep, int allow_deny, 1212 int entry_type, int accessmask) 1213 { 1214 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1215 uint16_t type = aclp->z_ops.ace_type_get(acep); 1216 uint16_t flags = aclp->z_ops.ace_flags_get(acep); 1217 1218 return (mask == accessmask && type == allow_deny && 1219 ((flags & ACE_TYPE_FLAGS) == entry_type)); 1220 } 1221 1222 /* 1223 * Can prepended ACE be reused? 1224 */ 1225 static int 1226 zfs_reuse_deny(zfs_acl_t *aclp, void *acep, void *prevacep) 1227 { 1228 int okay_masks; 1229 uint16_t prevtype; 1230 uint16_t prevflags; 1231 uint16_t flags; 1232 uint32_t mask, prevmask; 1233 1234 if (prevacep == NULL) 1235 return (B_FALSE); 1236 1237 prevtype = aclp->z_ops.ace_type_get(prevacep); 1238 prevflags = aclp->z_ops.ace_flags_get(prevacep); 1239 flags = aclp->z_ops.ace_flags_get(acep); 1240 mask = aclp->z_ops.ace_mask_get(acep); 1241 prevmask = aclp->z_ops.ace_mask_get(prevacep); 1242 1243 if (prevtype != DENY) 1244 return (B_FALSE); 1245 1246 if (prevflags != (flags & ACE_IDENTIFIER_GROUP)) 1247 return (B_FALSE); 1248 1249 okay_masks = (mask & OKAY_MASK_BITS); 1250 1251 if (prevmask & ~okay_masks) 1252 return (B_FALSE); 1253 1254 return (B_TRUE); 1255 } 1256 1257 1258 /* 1259 * Insert new ACL node into chain of zfs_acl_node_t's 1260 * 1261 * This will result in two possible results. 1262 * 1. If the ACL is currently just a single zfs_acl_node and 1263 * we are prepending the entry then current acl node will have 1264 * a new node inserted above it. 1265 * 1266 * 2. If we are inserting in the middle of current acl node then 1267 * the current node will be split in two and new node will be inserted 1268 * in between the two split nodes. 1269 */ 1270 static zfs_acl_node_t * 1271 zfs_acl_ace_insert(zfs_acl_t *aclp, void *acep) 1272 { 1273 zfs_acl_node_t *newnode; 1274 zfs_acl_node_t *trailernode = NULL; 1275 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1276 int curr_idx = aclp->z_curr_node->z_ace_idx; 1277 int trailer_count; 1278 size_t oldsize; 1279 1280 newnode = zfs_acl_node_alloc(aclp->z_ops.ace_size(acep)); 1281 newnode->z_ace_count = 1; 1282 1283 oldsize = currnode->z_size; 1284 1285 if (curr_idx != 1) { 1286 trailernode = zfs_acl_node_alloc(0); 1287 trailernode->z_acldata = acep; 1288 1289 trailer_count = currnode->z_ace_count - curr_idx + 1; 1290 currnode->z_ace_count = curr_idx - 1; 1291 currnode->z_size = (caddr_t)acep - (caddr_t)currnode->z_acldata; 1292 trailernode->z_size = oldsize - currnode->z_size; 1293 trailernode->z_ace_count = trailer_count; 1294 } 1295 1296 aclp->z_acl_count += 1; 1297 aclp->z_acl_bytes += aclp->z_ops.ace_size(acep); 1298 1299 if (curr_idx == 1) 1300 list_insert_before(&aclp->z_acl, currnode, newnode); 1301 else 1302 list_insert_after(&aclp->z_acl, currnode, newnode); 1303 if (trailernode) { 1304 list_insert_after(&aclp->z_acl, newnode, trailernode); 1305 aclp->z_curr_node = trailernode; 1306 trailernode->z_ace_idx = 1; 1307 } 1308 1309 return (newnode); 1310 } 1311 1312 /* 1313 * Prepend deny ACE 1314 */ 1315 static void * 1316 zfs_acl_prepend_deny(znode_t *zp, zfs_acl_t *aclp, void *acep, 1317 mode_t mode) 1318 { 1319 zfs_acl_node_t *aclnode; 1320 void *newacep; 1321 uint64_t fuid; 1322 uint16_t flags; 1323 1324 aclnode = zfs_acl_ace_insert(aclp, acep); 1325 newacep = aclnode->z_acldata; 1326 fuid = aclp->z_ops.ace_who_get(acep); 1327 flags = aclp->z_ops.ace_flags_get(acep); 1328 zfs_set_ace(aclp, newacep, 0, DENY, fuid, (flags & ACE_TYPE_FLAGS)); 1329 zfs_acl_prepend_fixup(aclp, newacep, acep, mode, zp->z_phys->zp_uid); 1330 1331 return (newacep); 1332 } 1333 1334 /* 1335 * Split an inherited ACE into inherit_only ACE 1336 * and original ACE with inheritance flags stripped off. 1337 */ 1338 static void 1339 zfs_acl_split_ace(zfs_acl_t *aclp, zfs_ace_hdr_t *acep) 1340 { 1341 zfs_acl_node_t *aclnode; 1342 zfs_acl_node_t *currnode; 1343 void *newacep; 1344 uint16_t type, flags; 1345 uint32_t mask; 1346 uint64_t fuid; 1347 1348 type = aclp->z_ops.ace_type_get(acep); 1349 flags = aclp->z_ops.ace_flags_get(acep); 1350 mask = aclp->z_ops.ace_mask_get(acep); 1351 fuid = aclp->z_ops.ace_who_get(acep); 1352 1353 aclnode = zfs_acl_ace_insert(aclp, acep); 1354 newacep = aclnode->z_acldata; 1355 1356 aclp->z_ops.ace_type_set(newacep, type); 1357 aclp->z_ops.ace_flags_set(newacep, flags | ACE_INHERIT_ONLY_ACE); 1358 aclp->z_ops.ace_mask_set(newacep, mask); 1359 aclp->z_ops.ace_type_set(newacep, type); 1360 aclp->z_ops.ace_who_set(newacep, fuid); 1361 aclp->z_next_ace = acep; 1362 flags &= ~ALL_INHERIT; 1363 aclp->z_ops.ace_flags_set(acep, flags); 1364 currnode = zfs_acl_curr_node(aclp); 1365 ASSERT(currnode->z_ace_idx >= 1); 1366 currnode->z_ace_idx -= 1; 1367 } 1368 1369 /* 1370 * Are ACES started at index i, the canonical six ACES? 1371 */ 1372 static int 1373 zfs_have_canonical_six(zfs_acl_t *aclp) 1374 { 1375 void *acep; 1376 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1377 int i = 0; 1378 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1379 1380 ASSERT(aclnode != NULL); 1381 1382 if (aclnode->z_ace_count < 6) 1383 return (0); 1384 1385 acep = (void *)((caddr_t)aclnode->z_acldata + 1386 aclnode->z_size - (aclp->z_ops.ace_abstract_size() * 6)); 1387 1388 if ((zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1389 DENY, ACE_OWNER, 0) && 1390 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1391 ALLOW, ACE_OWNER, OWNER_ALLOW_MASK) && 1392 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), DENY, 1393 OWNING_GROUP, 0) && zfs_acl_ace_match(aclp, (caddr_t)acep + 1394 (abstract_size * i++), 1395 ALLOW, OWNING_GROUP, 0) && 1396 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1397 DENY, ACE_EVERYONE, EVERYONE_DENY_MASK) && 1398 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1399 ALLOW, ACE_EVERYONE, EVERYONE_ALLOW_MASK))) { 1400 return (1); 1401 } else { 1402 return (0); 1403 } 1404 } 1405 1406 1407 /* 1408 * Apply step 1g, to group entries 1409 * 1410 * Need to deal with corner case where group may have 1411 * greater permissions than owner. If so then limit 1412 * group permissions, based on what extra permissions 1413 * group has. 1414 */ 1415 static void 1416 zfs_fixup_group_entries(zfs_acl_t *aclp, void *acep, void *prevacep, 1417 mode_t mode) 1418 { 1419 uint32_t prevmask = aclp->z_ops.ace_mask_get(prevacep); 1420 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1421 uint16_t prevflags = aclp->z_ops.ace_flags_get(prevacep); 1422 mode_t extramode = (mode >> 3) & 07; 1423 mode_t ownermode = (mode >> 6); 1424 1425 if (prevflags & ACE_IDENTIFIER_GROUP) { 1426 1427 extramode &= ~ownermode; 1428 1429 if (extramode) { 1430 if (extramode & S_IROTH) { 1431 prevmask &= ~ACE_READ_DATA; 1432 mask &= ~ACE_READ_DATA; 1433 } 1434 if (extramode & S_IWOTH) { 1435 prevmask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1436 mask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1437 } 1438 if (extramode & S_IXOTH) { 1439 prevmask &= ~ACE_EXECUTE; 1440 mask &= ~ACE_EXECUTE; 1441 } 1442 } 1443 } 1444 aclp->z_ops.ace_mask_set(acep, mask); 1445 aclp->z_ops.ace_mask_set(prevacep, prevmask); 1446 } 1447 1448 /* 1449 * Apply the chmod algorithm as described 1450 * in PSARC/2002/240 1451 */ 1452 static int 1453 zfs_acl_chmod(znode_t *zp, uint64_t mode, zfs_acl_t *aclp, 1454 dmu_tx_t *tx) 1455 { 1456 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1457 void *acep = NULL, *prevacep = NULL; 1458 uint64_t who; 1459 int i; 1460 int error; 1461 int entry_type; 1462 int reuse_deny; 1463 int need_canonical_six = 1; 1464 uint16_t iflags, type; 1465 uint32_t access_mask; 1466 1467 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1468 ASSERT(MUTEX_HELD(&zp->z_lock)); 1469 1470 aclp->z_hints = (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 1471 1472 /* 1473 * If discard then just discard all ACL nodes which 1474 * represent the ACEs. 1475 * 1476 * New owner@/group@/everone@ ACEs will be added 1477 * later. 1478 */ 1479 if (zfsvfs->z_acl_mode == ZFS_ACL_DISCARD) 1480 zfs_acl_release_nodes(aclp); 1481 1482 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 1483 &iflags, &type)) { 1484 1485 entry_type = (iflags & ACE_TYPE_FLAGS); 1486 iflags = (iflags & ALL_INHERIT); 1487 1488 if ((type != ALLOW && type != DENY) || 1489 (iflags & ACE_INHERIT_ONLY_ACE)) { 1490 if (iflags) 1491 aclp->z_hints |= ZFS_INHERIT_ACE; 1492 switch (type) { 1493 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1494 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1495 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1496 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1497 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 1498 break; 1499 } 1500 goto nextace; 1501 } 1502 1503 /* 1504 * Need to split ace into two? 1505 */ 1506 if ((iflags & (ACE_FILE_INHERIT_ACE| 1507 ACE_DIRECTORY_INHERIT_ACE)) && 1508 (!(iflags & ACE_INHERIT_ONLY_ACE))) { 1509 zfs_acl_split_ace(aclp, acep); 1510 aclp->z_hints |= ZFS_INHERIT_ACE; 1511 goto nextace; 1512 } 1513 1514 if (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE || 1515 (entry_type == OWNING_GROUP)) { 1516 access_mask &= ~OGE_CLEAR; 1517 aclp->z_ops.ace_mask_set(acep, access_mask); 1518 goto nextace; 1519 } else { 1520 reuse_deny = B_TRUE; 1521 if (type == ALLOW) { 1522 1523 /* 1524 * Check preceding ACE if any, to see 1525 * if we need to prepend a DENY ACE. 1526 * This is only applicable when the acl_mode 1527 * property == groupmask. 1528 */ 1529 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK) { 1530 1531 reuse_deny = zfs_reuse_deny(aclp, acep, 1532 prevacep); 1533 1534 if (reuse_deny == B_FALSE) { 1535 prevacep = 1536 zfs_acl_prepend_deny(zp, 1537 aclp, acep, mode); 1538 } else { 1539 zfs_acl_prepend_fixup( 1540 aclp, prevacep, 1541 acep, mode, 1542 zp->z_phys->zp_uid); 1543 } 1544 zfs_fixup_group_entries(aclp, acep, 1545 prevacep, mode); 1546 1547 } 1548 } 1549 } 1550 nextace: 1551 prevacep = acep; 1552 } 1553 1554 /* 1555 * Check out last six aces, if we have six. 1556 */ 1557 1558 if (aclp->z_acl_count >= 6) { 1559 if (zfs_have_canonical_six(aclp)) { 1560 need_canonical_six = 0; 1561 } 1562 } 1563 1564 if (need_canonical_six) { 1565 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1566 void *zacep; 1567 zfs_acl_node_t *aclnode = 1568 zfs_acl_node_alloc(abstract_size * 6); 1569 1570 aclnode->z_size = abstract_size * 6; 1571 aclnode->z_ace_count = 6; 1572 aclp->z_acl_bytes += aclnode->z_size; 1573 list_insert_tail(&aclp->z_acl, aclnode); 1574 1575 zacep = aclnode->z_acldata; 1576 1577 i = 0; 1578 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1579 0, DENY, -1, ACE_OWNER); 1580 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1581 OWNER_ALLOW_MASK, ALLOW, -1, ACE_OWNER); 1582 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1583 DENY, -1, OWNING_GROUP); 1584 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1585 ALLOW, -1, OWNING_GROUP); 1586 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1587 EVERYONE_DENY_MASK, DENY, -1, ACE_EVERYONE); 1588 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1589 EVERYONE_ALLOW_MASK, ALLOW, -1, ACE_EVERYONE); 1590 aclp->z_acl_count += 6; 1591 } 1592 1593 zfs_acl_fixup_canonical_six(aclp, mode); 1594 zp->z_phys->zp_mode = mode; 1595 error = zfs_aclset_common(zp, aclp, NULL, tx); 1596 return (error); 1597 } 1598 1599 int 1600 zfs_acl_chmod_setattr(znode_t *zp, uint64_t mode, dmu_tx_t *tx) 1601 { 1602 zfs_acl_t *aclp = NULL; 1603 int error; 1604 1605 ASSERT(MUTEX_HELD(&zp->z_lock)); 1606 mutex_enter(&zp->z_acl_lock); 1607 error = zfs_acl_node_read(zp, &aclp, B_TRUE); 1608 if (error == 0) 1609 error = zfs_acl_chmod(zp, mode, aclp, tx); 1610 mutex_exit(&zp->z_acl_lock); 1611 if (aclp) 1612 zfs_acl_free(aclp); 1613 return (error); 1614 } 1615 1616 /* 1617 * strip off write_owner and write_acl 1618 */ 1619 static void 1620 zfs_securemode_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep) 1621 { 1622 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1623 1624 if ((zfsvfs->z_acl_inherit == ZFS_ACL_SECURE) && 1625 (aclp->z_ops.ace_type_get(acep) == ALLOW)) { 1626 mask &= ~SECURE_CLEAR; 1627 aclp->z_ops.ace_mask_set(acep, mask); 1628 } 1629 } 1630 1631 /* 1632 * Should ACE be inherited? 1633 */ 1634 static int 1635 zfs_ace_can_use(znode_t *zp, uint16_t acep_flags) 1636 { 1637 int vtype = ZTOV(zp)->v_type; 1638 int iflags = (acep_flags & 0xf); 1639 1640 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE)) 1641 return (1); 1642 else if (iflags & ACE_FILE_INHERIT_ACE) 1643 return (!((vtype == VDIR) && 1644 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE))); 1645 return (0); 1646 } 1647 1648 /* 1649 * inherit inheritable ACEs from parent 1650 */ 1651 static zfs_acl_t * 1652 zfs_acl_inherit(znode_t *zp, zfs_acl_t *paclp) 1653 { 1654 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1655 void *pacep; 1656 void *acep, *acep2; 1657 zfs_acl_node_t *aclnode, *aclnode2; 1658 zfs_acl_t *aclp = NULL; 1659 uint64_t who; 1660 uint32_t access_mask; 1661 uint16_t iflags, newflags, type; 1662 size_t ace_size; 1663 void *data1, *data2; 1664 size_t data1sz, data2sz; 1665 1666 pacep = NULL; 1667 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1668 if (zfsvfs->z_acl_inherit != ZFS_ACL_DISCARD) { 1669 while (pacep = zfs_acl_next_ace(paclp, pacep, &who, 1670 &access_mask, &iflags, &type)) { 1671 1672 if (zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW && 1673 type == ALLOW) 1674 continue; 1675 1676 ace_size = aclp->z_ops.ace_size(pacep); 1677 1678 if (zfs_ace_can_use(zp, iflags)) { 1679 aclnode = 1680 zfs_acl_node_alloc(ace_size); 1681 1682 list_insert_tail(&aclp->z_acl, aclnode); 1683 acep = aclnode->z_acldata; 1684 zfs_set_ace(aclp, acep, access_mask, type, 1685 who, iflags|ACE_INHERITED_ACE); 1686 1687 /* 1688 * Copy special opaque data if any 1689 */ 1690 if ((data1sz = paclp->z_ops.ace_data(pacep, 1691 &data1)) != 0) { 1692 VERIFY((data2sz = 1693 aclp->z_ops.ace_data(acep, 1694 &data2)) == data1sz); 1695 bcopy(data1, data2, data2sz); 1696 } 1697 aclp->z_acl_count++; 1698 aclnode->z_ace_count++; 1699 aclp->z_acl_bytes += aclnode->z_size; 1700 newflags = aclp->z_ops.ace_flags_get(acep); 1701 if ((iflags & 1702 ACE_NO_PROPAGATE_INHERIT_ACE) || 1703 (ZTOV(zp)->v_type != VDIR)) { 1704 newflags &= ~ALL_INHERIT; 1705 aclp->z_ops.ace_flags_set(acep, 1706 newflags|ACE_INHERITED_ACE); 1707 zfs_securemode_update(zfsvfs, 1708 aclp, acep); 1709 continue; 1710 } 1711 1712 ASSERT(ZTOV(zp)->v_type == VDIR); 1713 1714 newflags = aclp->z_ops.ace_flags_get(acep); 1715 if ((iflags & (ACE_FILE_INHERIT_ACE | 1716 ACE_DIRECTORY_INHERIT_ACE)) != 1717 ACE_FILE_INHERIT_ACE) { 1718 aclnode2 = zfs_acl_node_alloc(ace_size); 1719 list_insert_tail(&aclp->z_acl, 1720 aclnode2); 1721 acep2 = aclnode2->z_acldata; 1722 zfs_set_ace(aclp, acep2, 1723 access_mask, type, who, 1724 iflags|ACE_INHERITED_ACE); 1725 newflags |= ACE_INHERIT_ONLY_ACE; 1726 aclp->z_ops.ace_flags_set(acep, 1727 newflags); 1728 newflags &= ~ALL_INHERIT; 1729 aclp->z_ops.ace_flags_set(acep2, 1730 newflags|ACE_INHERITED_ACE); 1731 1732 /* 1733 * Copy special opaque data if any 1734 */ 1735 if ((data1sz = 1736 aclp->z_ops.ace_data(acep, 1737 &data1)) != 0) { 1738 VERIFY((data2sz = 1739 aclp->z_ops.ace_data(acep2, 1740 &data2)) == data1sz); 1741 bcopy(data1, data2, data1sz); 1742 } 1743 aclp->z_acl_count++; 1744 aclnode2->z_ace_count++; 1745 aclp->z_acl_bytes += aclnode->z_size; 1746 zfs_securemode_update(zfsvfs, 1747 aclp, acep2); 1748 } else { 1749 newflags |= ACE_INHERIT_ONLY_ACE; 1750 aclp->z_ops.ace_flags_set(acep, 1751 newflags|ACE_INHERITED_ACE); 1752 } 1753 1754 } 1755 } 1756 } 1757 return (aclp); 1758 } 1759 1760 /* 1761 * Create file system object initial permissions 1762 * including inheritable ACEs. 1763 */ 1764 void 1765 zfs_perm_init(znode_t *zp, znode_t *parent, int flag, 1766 vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 1767 zfs_acl_t *setaclp, zfs_fuid_info_t **fuidp) 1768 { 1769 uint64_t mode; 1770 uint64_t uid; 1771 uint64_t gid; 1772 int error; 1773 int pull_down; 1774 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1775 zfs_acl_t *aclp = NULL; 1776 zfs_acl_t *paclp; 1777 xvattr_t *xvap = (xvattr_t *)vap; 1778 1779 if (setaclp) 1780 aclp = setaclp; 1781 1782 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1783 1784 /* 1785 * Determine uid and gid. 1786 */ 1787 if ((flag & (IS_ROOT_NODE | IS_REPLAY)) || 1788 ((flag & IS_XATTR) && (vap->va_type == VDIR))) { 1789 uid = zfs_fuid_create(zfsvfs, vap->va_uid, 1790 ZFS_OWNER, tx, fuidp); 1791 gid = zfs_fuid_create(zfsvfs, vap->va_gid, 1792 ZFS_GROUP, tx, fuidp); 1793 } else { 1794 uid = zfs_fuid_create_cred(zfsvfs, crgetuid(cr), 1795 ZFS_OWNER, tx, cr, fuidp); 1796 if ((vap->va_mask & AT_GID) && 1797 ((vap->va_gid == parent->z_phys->zp_gid) || 1798 groupmember(vap->va_gid, cr) || 1799 secpolicy_vnode_create_gid(cr) == 0)) { 1800 gid = zfs_fuid_create_cred(zfsvfs, vap->va_gid, 1801 ZFS_GROUP, tx, cr, fuidp); 1802 } else { 1803 gid = (parent->z_phys->zp_mode & S_ISGID) ? 1804 parent->z_phys->zp_gid : crgetgid(cr); 1805 gid = zfs_fuid_create_cred(zfsvfs, gid, 1806 ZFS_GROUP, tx, cr, fuidp); 1807 } 1808 } 1809 1810 /* 1811 * If we're creating a directory, and the parent directory has the 1812 * set-GID bit set, set in on the new directory. 1813 * Otherwise, if the user is neither privileged nor a member of the 1814 * file's new group, clear the file's set-GID bit. 1815 */ 1816 1817 if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR)) 1818 mode |= S_ISGID; 1819 else { 1820 if ((mode & S_ISGID) && 1821 secpolicy_vnode_setids_setgids(cr, gid) != 0) 1822 mode &= ~S_ISGID; 1823 } 1824 1825 zp->z_phys->zp_uid = uid; 1826 zp->z_phys->zp_gid = gid; 1827 zp->z_phys->zp_mode = mode; 1828 1829 if (aclp == NULL) { 1830 mutex_enter(&parent->z_lock); 1831 pull_down = (parent->z_phys->zp_flags & ZFS_INHERIT_ACE); 1832 if (pull_down) { 1833 mutex_enter(&parent->z_acl_lock); 1834 VERIFY(0 == zfs_acl_node_read(parent, &paclp, B_FALSE)); 1835 mutex_exit(&parent->z_acl_lock); 1836 aclp = zfs_acl_inherit(zp, paclp); 1837 zfs_acl_free(paclp); 1838 } else { 1839 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1840 } 1841 mutex_exit(&parent->z_lock); 1842 mutex_enter(&zp->z_lock); 1843 mutex_enter(&zp->z_acl_lock); 1844 error = zfs_acl_chmod(zp, mode, aclp, tx); 1845 } else { 1846 mutex_enter(&zp->z_lock); 1847 mutex_enter(&zp->z_acl_lock); 1848 } 1849 1850 /* Force auto_inherit on all new directory objects */ 1851 if (vap->va_type == VDIR) 1852 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 1853 1854 error = zfs_aclset_common(zp, aclp, fuidp, tx); 1855 1856 /* Set optional attributes if any */ 1857 if (vap->va_mask & AT_XVATTR) 1858 zfs_xvattr_set(zp, xvap); 1859 1860 mutex_exit(&zp->z_lock); 1861 mutex_exit(&zp->z_acl_lock); 1862 ASSERT3U(error, ==, 0); 1863 1864 if (aclp != setaclp) { 1865 zfs_acl_free(aclp); 1866 } 1867 } 1868 1869 /* 1870 * Retrieve a files ACL 1871 */ 1872 int 1873 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1874 { 1875 zfs_acl_t *aclp; 1876 ulong_t mask; 1877 int error; 1878 int count = 0; 1879 int largeace = 0; 1880 1881 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1882 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1883 1884 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)) 1885 return (error); 1886 1887 if (mask == 0) 1888 return (ENOSYS); 1889 1890 mutex_enter(&zp->z_acl_lock); 1891 1892 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 1893 if (error != 0) { 1894 mutex_exit(&zp->z_acl_lock); 1895 return (error); 1896 } 1897 1898 /* 1899 * Scan ACL to determine number of ACEs 1900 */ 1901 if ((zp->z_phys->zp_flags & ZFS_ACL_OBJ_ACE) && 1902 !(mask & VSA_ACE_ALLTYPES)) { 1903 void *zacep = NULL; 1904 uint64_t who; 1905 uint32_t access_mask; 1906 uint16_t type, iflags; 1907 1908 while (zacep = zfs_acl_next_ace(aclp, zacep, 1909 &who, &access_mask, &iflags, &type)) { 1910 switch (type) { 1911 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1912 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1913 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1914 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1915 largeace++; 1916 continue; 1917 default: 1918 count++; 1919 } 1920 } 1921 vsecp->vsa_aclcnt = count; 1922 } else 1923 count = aclp->z_acl_count; 1924 1925 if (mask & VSA_ACECNT) { 1926 vsecp->vsa_aclcnt = count; 1927 } 1928 1929 if (mask & VSA_ACE) { 1930 size_t aclsz; 1931 1932 zfs_acl_node_t *aclnode = list_head(&aclp->z_acl); 1933 1934 aclsz = count * sizeof (ace_t) + 1935 sizeof (ace_object_t) * largeace; 1936 1937 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 1938 vsecp->vsa_aclentsz = aclsz; 1939 1940 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 1941 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, 1942 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 1943 else { 1944 bcopy(aclnode->z_acldata, vsecp->vsa_aclentp, 1945 count * sizeof (ace_t)); 1946 } 1947 } 1948 if (mask & VSA_ACE_ACLFLAGS) { 1949 vsecp->vsa_aclflags = 0; 1950 if (zp->z_phys->zp_flags & ZFS_ACL_DEFAULTED) 1951 vsecp->vsa_aclflags |= ACL_DEFAULTED; 1952 if (zp->z_phys->zp_flags & ZFS_ACL_PROTECTED) 1953 vsecp->vsa_aclflags |= ACL_PROTECTED; 1954 if (zp->z_phys->zp_flags & ZFS_ACL_AUTO_INHERIT) 1955 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 1956 } 1957 1958 mutex_exit(&zp->z_acl_lock); 1959 1960 zfs_acl_free(aclp); 1961 1962 return (0); 1963 } 1964 1965 int 1966 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type, 1967 vsecattr_t *vsecp, zfs_acl_t **zaclp) 1968 { 1969 zfs_acl_t *aclp; 1970 zfs_acl_node_t *aclnode; 1971 int aclcnt = vsecp->vsa_aclcnt; 1972 int error; 1973 1974 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 1975 return (EINVAL); 1976 1977 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 1978 1979 aclp->z_hints = 0; 1980 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 1981 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1982 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp, 1983 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 1984 aclcnt, &aclnode->z_size)) != 0) { 1985 zfs_acl_free(aclp); 1986 zfs_acl_node_free(aclnode); 1987 return (error); 1988 } 1989 } else { 1990 if ((error = zfs_copy_ace_2_fuid(obj_type, aclp, 1991 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 1992 &aclnode->z_size)) != 0) { 1993 zfs_acl_free(aclp); 1994 zfs_acl_node_free(aclnode); 1995 return (error); 1996 } 1997 } 1998 aclp->z_acl_bytes = aclnode->z_size; 1999 aclnode->z_ace_count = aclcnt; 2000 aclp->z_acl_count = aclcnt; 2001 list_insert_head(&aclp->z_acl, aclnode); 2002 2003 /* 2004 * If flags are being set then add them to z_hints 2005 */ 2006 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2007 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2008 aclp->z_hints |= ZFS_ACL_PROTECTED; 2009 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2010 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2011 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2012 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2013 } 2014 2015 *zaclp = aclp; 2016 2017 return (0); 2018 } 2019 2020 /* 2021 * Set a files ACL 2022 */ 2023 int 2024 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2025 { 2026 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2027 zilog_t *zilog = zfsvfs->z_log; 2028 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2029 dmu_tx_t *tx; 2030 int error; 2031 zfs_acl_t *aclp; 2032 zfs_fuid_info_t *fuidp = NULL; 2033 2034 if (mask == 0) 2035 return (ENOSYS); 2036 2037 if (zp->z_phys->zp_flags & ZFS_IMMUTABLE) 2038 return (EPERM); 2039 2040 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) 2041 return (error); 2042 2043 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, &aclp); 2044 if (error) 2045 return (error); 2046 2047 /* 2048 * If ACL wide flags aren't being set then preserve any 2049 * existing flags. 2050 */ 2051 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2052 aclp->z_hints |= (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 2053 } 2054 top: 2055 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) { 2056 zfs_acl_free(aclp); 2057 return (error); 2058 } 2059 2060 mutex_enter(&zp->z_lock); 2061 mutex_enter(&zp->z_acl_lock); 2062 2063 tx = dmu_tx_create(zfsvfs->z_os); 2064 dmu_tx_hold_bonus(tx, zp->z_id); 2065 2066 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 2067 /* Are we upgrading ACL? */ 2068 if (zfsvfs->z_version <= ZPL_VERSION_FUID && 2069 zp->z_phys->zp_acl.z_acl_version == 2070 ZFS_ACL_VERSION_INITIAL) { 2071 dmu_tx_hold_free(tx, 2072 zp->z_phys->zp_acl.z_acl_extern_obj, 2073 0, DMU_OBJECT_END); 2074 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2075 0, sizeof (zfs_object_ace_t) * 2048 + 6); 2076 } else { 2077 dmu_tx_hold_write(tx, 2078 zp->z_phys->zp_acl.z_acl_extern_obj, 2079 0, aclp->z_acl_bytes); 2080 } 2081 } else if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2082 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2083 } 2084 if (zfsvfs->z_fuid_obj == 0) { 2085 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 2086 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2087 SPA_MAXBLOCKSIZE); 2088 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); 2089 } else { 2090 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj); 2091 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0, 2092 SPA_MAXBLOCKSIZE); 2093 } 2094 2095 error = dmu_tx_assign(tx, zfsvfs->z_assign); 2096 if (error) { 2097 mutex_exit(&zp->z_acl_lock); 2098 mutex_exit(&zp->z_lock); 2099 2100 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2101 dmu_tx_wait(tx); 2102 dmu_tx_abort(tx); 2103 goto top; 2104 } 2105 dmu_tx_abort(tx); 2106 zfs_acl_free(aclp); 2107 return (error); 2108 } 2109 2110 error = zfs_aclset_common(zp, aclp, &fuidp, tx); 2111 ASSERT(error == 0); 2112 2113 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2114 2115 if (fuidp) 2116 zfs_fuid_info_free(fuidp); 2117 zfs_acl_free(aclp); 2118 dmu_tx_commit(tx); 2119 done: 2120 mutex_exit(&zp->z_acl_lock); 2121 mutex_exit(&zp->z_lock); 2122 2123 return (error); 2124 } 2125 2126 /* 2127 * working_mode returns the permissions that were not granted 2128 */ 2129 static int 2130 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2131 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr) 2132 { 2133 zfs_acl_t *aclp; 2134 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2135 int error; 2136 int access_deny = ACCESS_UNDETERMINED; 2137 uid_t uid = crgetuid(cr); 2138 uint64_t who; 2139 uint16_t type, iflags; 2140 uint16_t entry_type; 2141 uint32_t access_mask; 2142 zfs_ace_hdr_t *acep = NULL; 2143 boolean_t checkit; 2144 uid_t fowner; 2145 uid_t gowner; 2146 2147 /* 2148 * Short circuit empty requests 2149 */ 2150 if (v4_mode == 0) 2151 return (0); 2152 2153 *check_privs = B_TRUE; 2154 2155 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ 2156 *working_mode = 0; 2157 return (0); 2158 } 2159 2160 *working_mode = v4_mode; 2161 2162 if ((v4_mode & WRITE_MASK) && 2163 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && 2164 (!IS_DEVVP(ZTOV(zp)))) { 2165 *check_privs = B_FALSE; 2166 return (EROFS); 2167 } 2168 2169 /* 2170 * Only check for READONLY on non-directories. 2171 */ 2172 if ((v4_mode & WRITE_MASK_DATA) && 2173 (((ZTOV(zp)->v_type != VDIR) && 2174 (zp->z_phys->zp_flags & (ZFS_READONLY | ZFS_IMMUTABLE))) || 2175 (ZTOV(zp)->v_type == VDIR && 2176 (zp->z_phys->zp_flags & ZFS_IMMUTABLE)))) { 2177 *check_privs = B_FALSE; 2178 return (EPERM); 2179 } 2180 2181 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2182 (zp->z_phys->zp_flags & ZFS_NOUNLINK)) { 2183 *check_privs = B_FALSE; 2184 return (EPERM); 2185 } 2186 2187 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2188 (zp->z_phys->zp_flags & ZFS_AV_QUARANTINED))) { 2189 *check_privs = B_FALSE; 2190 return (EACCES); 2191 } 2192 2193 /* 2194 * The caller requested that the ACL check be skipped. This 2195 * would only happen if the caller checked VOP_ACCESS() with a 2196 * 32 bit ACE mask and already had the appropriate permissions. 2197 */ 2198 if (skipaclchk) { 2199 *working_mode = 0; 2200 return (0); 2201 } 2202 2203 zfs_fuid_map_ids(zp, &fowner, &gowner); 2204 2205 mutex_enter(&zp->z_acl_lock); 2206 2207 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 2208 if (error != 0) { 2209 mutex_exit(&zp->z_acl_lock); 2210 return (error); 2211 } 2212 2213 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2214 &iflags, &type)) { 2215 2216 if (iflags & ACE_INHERIT_ONLY_ACE) 2217 continue; 2218 2219 entry_type = (iflags & ACE_TYPE_FLAGS); 2220 2221 checkit = B_FALSE; 2222 2223 switch (entry_type) { 2224 case ACE_OWNER: 2225 if (uid == fowner) 2226 checkit = B_TRUE; 2227 break; 2228 case OWNING_GROUP: 2229 who = gowner; 2230 /*FALLTHROUGH*/ 2231 case ACE_IDENTIFIER_GROUP: 2232 checkit = zfs_groupmember(zfsvfs, who, cr); 2233 break; 2234 case ACE_EVERYONE: 2235 checkit = B_TRUE; 2236 break; 2237 2238 /* USER Entry */ 2239 default: 2240 if (entry_type == 0) { 2241 uid_t newid; 2242 2243 zfs_fuid_map_id(zfsvfs, who, 2244 ZFS_ACE_USER, &newid); 2245 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2246 uid == newid) 2247 checkit = B_TRUE; 2248 break; 2249 } else { 2250 zfs_acl_free(aclp); 2251 mutex_exit(&zp->z_acl_lock); 2252 return (EIO); 2253 } 2254 } 2255 2256 if (checkit) { 2257 if (access_mask & *working_mode) { 2258 if (type == ALLOW) { 2259 *working_mode &= 2260 ~(*working_mode & access_mask); 2261 if (*working_mode == 0) { 2262 access_deny = 0; 2263 } 2264 } else if (type == DENY) { 2265 access_deny = EACCES; 2266 } 2267 } 2268 } 2269 2270 if (access_deny != ACCESS_UNDETERMINED) 2271 break; 2272 } 2273 2274 mutex_exit(&zp->z_acl_lock); 2275 zfs_acl_free(aclp); 2276 out: 2277 return (access_deny); 2278 } 2279 2280 static int 2281 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2282 cred_t *cr) 2283 { 2284 if (*working_mode != ACE_WRITE_DATA) 2285 return (EACCES); 2286 2287 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2288 check_privs, B_FALSE, cr)); 2289 } 2290 2291 /* 2292 * Determine whether Access should be granted/denied, invoking least 2293 * priv subsytem when a deny is determined. 2294 */ 2295 int 2296 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) 2297 { 2298 uint32_t working_mode; 2299 int error; 2300 int is_attr; 2301 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2302 boolean_t check_privs; 2303 znode_t *xzp; 2304 znode_t *check_zp = zp; 2305 2306 is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && 2307 (ZTOV(zp)->v_type == VDIR)); 2308 2309 /* 2310 * If attribute then validate against base file 2311 */ 2312 if (is_attr) { 2313 if ((error = zfs_zget(zp->z_zfsvfs, 2314 zp->z_phys->zp_parent, &xzp)) != 0) { 2315 return (error); 2316 } 2317 2318 check_zp = xzp; 2319 2320 /* 2321 * fixup mode to map to xattr perms 2322 */ 2323 2324 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2325 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2326 mode |= ACE_WRITE_NAMED_ATTRS; 2327 } 2328 2329 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2330 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2331 mode |= ACE_READ_NAMED_ATTRS; 2332 } 2333 } 2334 2335 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2336 &check_privs, skipaclchk, cr)) == 0) { 2337 if (is_attr) 2338 VN_RELE(ZTOV(xzp)); 2339 return (0); 2340 } 2341 2342 if (error && check_privs == B_FALSE) { 2343 if (is_attr) 2344 VN_RELE(ZTOV(xzp)); 2345 return (error); 2346 } 2347 2348 if (error && (flags & V_APPEND)) { 2349 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr); 2350 } 2351 2352 if (error && check_privs) { 2353 uid_t owner; 2354 mode_t checkmode = 0; 2355 2356 zfs_fuid_map_id(zfsvfs, check_zp->z_phys->zp_uid, 2357 ZFS_OWNER, &owner); 2358 2359 /* 2360 * First check for implicit owner permission on 2361 * read_acl/read_attributes 2362 */ 2363 2364 error = 0; 2365 ASSERT(working_mode != 0); 2366 2367 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2368 owner == crgetuid(cr))) 2369 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2370 2371 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2372 ACE_READ_ACL|ACE_READ_ATTRIBUTES)) 2373 checkmode |= VREAD; 2374 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2375 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES)) 2376 checkmode |= VWRITE; 2377 if (working_mode & ACE_EXECUTE) 2378 checkmode |= VEXEC; 2379 2380 if (checkmode) 2381 error = secpolicy_vnode_access(cr, ZTOV(check_zp), 2382 owner, checkmode); 2383 2384 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2385 error = secpolicy_vnode_create_gid(cr); 2386 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2387 error = secpolicy_vnode_setdac(cr, owner); 2388 2389 if (error == 0 && (working_mode & 2390 (ACE_DELETE|ACE_DELETE_CHILD))) 2391 error = secpolicy_vnode_remove(cr); 2392 2393 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) 2394 error = secpolicy_vnode_owner(cr, owner); 2395 2396 if (error == 0) { 2397 /* 2398 * See if any bits other than those already checked 2399 * for are still present. If so then return EACCES 2400 */ 2401 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2402 error = EACCES; 2403 } 2404 } 2405 } 2406 2407 if (is_attr) 2408 VN_RELE(ZTOV(xzp)); 2409 2410 return (error); 2411 } 2412 2413 /* 2414 * Translate traditional unix VREAD/VWRITE/VEXEC mode into 2415 * native ACL format and call zfs_zaccess() 2416 */ 2417 int 2418 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr) 2419 { 2420 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr)); 2421 } 2422 2423 /* 2424 * Access function for secpolicy_vnode_setattr 2425 */ 2426 int 2427 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr) 2428 { 2429 int v4_mode = zfs_unix_to_v4(mode >> 6); 2430 2431 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr)); 2432 } 2433 2434 static int 2435 zfs_delete_final_check(znode_t *zp, znode_t *dzp, cred_t *cr) 2436 { 2437 int error; 2438 uid_t downer; 2439 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2440 2441 zfs_fuid_map_id(zfsvfs, dzp->z_phys->zp_uid, ZFS_OWNER, &downer); 2442 2443 error = secpolicy_vnode_access(cr, ZTOV(zp), downer, S_IWRITE|S_IEXEC); 2444 2445 if (error == 0) 2446 error = zfs_sticky_remove_access(dzp, zp, cr); 2447 2448 return (error); 2449 } 2450 2451 /* 2452 * Determine whether Access should be granted/deny, without 2453 * consulting least priv subsystem. 2454 * 2455 * 2456 * The following chart is the recommended NFSv4 enforcement for 2457 * ability to delete an object. 2458 * 2459 * ------------------------------------------------------- 2460 * | Parent Dir | Target Object Permissions | 2461 * | permissions | | 2462 * ------------------------------------------------------- 2463 * | | ACL Allows | ACL Denies| Delete | 2464 * | | Delete | Delete | unspecified| 2465 * ------------------------------------------------------- 2466 * | ACL Allows | Permit | Permit | Permit | 2467 * | DELETE_CHILD | | 2468 * ------------------------------------------------------- 2469 * | ACL Denies | Permit | Deny | Deny | 2470 * | DELETE_CHILD | | | | 2471 * ------------------------------------------------------- 2472 * | ACL specifies | | | | 2473 * | only allow | Permit | Permit | Permit | 2474 * | write and | | | | 2475 * | execute | | | | 2476 * ------------------------------------------------------- 2477 * | ACL denies | | | | 2478 * | write and | Permit | Deny | Deny | 2479 * | execute | | | | 2480 * ------------------------------------------------------- 2481 * ^ 2482 * | 2483 * No search privilege, can't even look up file? 2484 * 2485 */ 2486 int 2487 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr) 2488 { 2489 uint32_t dzp_working_mode = 0; 2490 uint32_t zp_working_mode = 0; 2491 int dzp_error, zp_error; 2492 boolean_t dzpcheck_privs = B_TRUE; 2493 boolean_t zpcheck_privs = B_TRUE; 2494 2495 /* 2496 * Arghh, this check is going to require a couple of questions 2497 * to be asked. We want specific DELETE permissions to 2498 * take precedence over WRITE/EXECUTE. We don't 2499 * want an ACL such as this to mess us up. 2500 * user:joe:write_data:deny,user:joe:delete:allow 2501 * 2502 * However, deny permissions may ultimately be overridden 2503 * by secpolicy_vnode_access(). 2504 */ 2505 2506 if (zp->z_phys->zp_flags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2507 return (EPERM); 2508 2509 dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD, 2510 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr); 2511 zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2512 &zpcheck_privs, B_FALSE, cr); 2513 2514 if ((dzp_error && dzpcheck_privs == B_FALSE) || 2515 (zp_error && zpcheck_privs == B_FALSE)) 2516 return (dzp_error); 2517 2518 /* 2519 * First check the first row. 2520 * We only need to see if parent Allows delete_child 2521 */ 2522 if ((dzp_working_mode & ACE_DELETE_CHILD) == 0) 2523 return (0); 2524 2525 /* 2526 * Second row 2527 * we already have the necessary information in 2528 * zp_working_mode, zp_error and dzp_error. 2529 */ 2530 2531 if ((zp_working_mode & ACE_DELETE) == 0) 2532 return (0); 2533 2534 /* 2535 * Now zp_error should either be EACCES which indicates 2536 * a "deny" delete entry or ACCESS_UNDETERMINED if the "delete" 2537 * entry exists on the target. 2538 * 2539 * dzp_error should be either EACCES which indicates a "deny" 2540 * entry for delete_child or ACCESS_UNDETERMINED if no delete_child 2541 * entry exists. If value is EACCES then we are done 2542 * and zfs_delete_final_check() will make the final decision 2543 * regarding to allow the delete. 2544 */ 2545 2546 ASSERT(zp_error != 0 && dzp_error != 0); 2547 if (dzp_error == EACCES) 2548 return (zfs_delete_final_check(zp, dzp, cr)); 2549 2550 /* 2551 * Third Row 2552 * Only need to check for write/execute on parent 2553 */ 2554 2555 dzp_error = zfs_zaccess_common(dzp, ACE_WRITE_DATA|ACE_EXECUTE, 2556 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr); 2557 2558 if (dzp_error && dzpcheck_privs == B_FALSE) 2559 return (dzp_error); 2560 2561 if ((dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE)) == 0) 2562 return (zfs_sticky_remove_access(dzp, zp, cr)); 2563 2564 /* 2565 * Fourth Row 2566 */ 2567 2568 if (((dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE)) != 0) && 2569 ((zp_working_mode & ACE_DELETE) == 0)) 2570 return (zfs_sticky_remove_access(dzp, zp, cr)); 2571 2572 return (zfs_delete_final_check(zp, dzp, cr)); 2573 } 2574 2575 int 2576 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2577 znode_t *tzp, cred_t *cr) 2578 { 2579 int add_perm; 2580 int error; 2581 2582 if (szp->z_phys->zp_flags & ZFS_AV_QUARANTINED) 2583 return (EACCES); 2584 2585 add_perm = (ZTOV(szp)->v_type == VDIR) ? 2586 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 2587 2588 /* 2589 * Rename permissions are combination of delete permission + 2590 * add file/subdir permission. 2591 */ 2592 2593 /* 2594 * first make sure we do the delete portion. 2595 * 2596 * If that succeeds then check for add_file/add_subdir permissions 2597 */ 2598 2599 if (error = zfs_zaccess_delete(sdzp, szp, cr)) 2600 return (error); 2601 2602 /* 2603 * If we have a tzp, see if we can delete it? 2604 */ 2605 if (tzp) { 2606 if (error = zfs_zaccess_delete(tdzp, tzp, cr)) 2607 return (error); 2608 } 2609 2610 /* 2611 * Now check for add permissions 2612 */ 2613 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr); 2614 2615 return (error); 2616 } 2617