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|ACE_DELETE|ACE_DELETE_CHILD) 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 RESTRICTED_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 if (obj_type == VDIR && 436 (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE))) 437 aclp->z_hints |= ZFS_INHERIT_ACE; 438 439 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) { 440 if ((iflags & (ACE_FILE_INHERIT_ACE| 441 ACE_DIRECTORY_INHERIT_ACE)) == 0) { 442 return (B_FALSE); 443 } 444 } 445 446 return (B_TRUE); 447 } 448 449 static void * 450 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who, 451 uint32_t *access_mask, uint16_t *iflags, uint16_t *type) 452 { 453 zfs_acl_node_t *aclnode; 454 455 if (start == NULL) { 456 aclnode = list_head(&aclp->z_acl); 457 if (aclnode == NULL) 458 return (NULL); 459 460 aclp->z_next_ace = aclnode->z_acldata; 461 aclp->z_curr_node = aclnode; 462 aclnode->z_ace_idx = 0; 463 } 464 465 aclnode = aclp->z_curr_node; 466 467 if (aclnode == NULL) 468 return (NULL); 469 470 if (aclnode->z_ace_idx >= aclnode->z_ace_count) { 471 aclnode = list_next(&aclp->z_acl, aclnode); 472 if (aclnode == NULL) 473 return (NULL); 474 else { 475 aclp->z_curr_node = aclnode; 476 aclnode->z_ace_idx = 0; 477 aclp->z_next_ace = aclnode->z_acldata; 478 } 479 } 480 481 if (aclnode->z_ace_idx < aclnode->z_ace_count) { 482 void *acep = aclp->z_next_ace; 483 *iflags = aclp->z_ops.ace_flags_get(acep); 484 *type = aclp->z_ops.ace_type_get(acep); 485 *access_mask = aclp->z_ops.ace_mask_get(acep); 486 *who = aclp->z_ops.ace_who_get(acep); 487 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + 488 aclp->z_ops.ace_size(acep); 489 aclnode->z_ace_idx++; 490 return ((void *)acep); 491 } 492 return (NULL); 493 } 494 495 /*ARGSUSED*/ 496 static uint64_t 497 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt, 498 uint16_t *flags, uint16_t *type, uint32_t *mask) 499 { 500 zfs_acl_t *aclp = datap; 501 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie; 502 uint64_t who; 503 504 acep = zfs_acl_next_ace(aclp, acep, &who, mask, 505 flags, type); 506 return ((uint64_t)(uintptr_t)acep); 507 } 508 509 static zfs_acl_node_t * 510 zfs_acl_curr_node(zfs_acl_t *aclp) 511 { 512 ASSERT(aclp->z_curr_node); 513 return (aclp->z_curr_node); 514 } 515 516 /* 517 * Copy ACE to internal ZFS format. 518 * While processing the ACL each ACE will be validated for correctness. 519 * ACE FUIDs will be created later. 520 */ 521 int 522 zfs_copy_ace_2_fuid(vtype_t obj_type, zfs_acl_t *aclp, void *datap, 523 zfs_ace_t *z_acl, int aclcnt, size_t *size) 524 { 525 int i; 526 uint16_t entry_type; 527 zfs_ace_t *aceptr = z_acl; 528 ace_t *acep = datap; 529 zfs_object_ace_t *zobjacep; 530 ace_object_t *aceobjp; 531 532 for (i = 0; i != aclcnt; i++) { 533 aceptr->z_hdr.z_access_mask = acep->a_access_mask; 534 aceptr->z_hdr.z_flags = acep->a_flags; 535 aceptr->z_hdr.z_type = acep->a_type; 536 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS; 537 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP && 538 entry_type != ACE_EVERYONE) { 539 if (!aclp->z_has_fuids) 540 aclp->z_has_fuids = IS_EPHEMERAL(acep->a_who); 541 aceptr->z_fuid = (uint64_t)acep->a_who; 542 } 543 544 /* 545 * Make sure ACE is valid 546 */ 547 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type, 548 aceptr->z_hdr.z_flags) != B_TRUE) 549 return (EINVAL); 550 551 switch (acep->a_type) { 552 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 553 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 554 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 555 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 556 zobjacep = (zfs_object_ace_t *)aceptr; 557 aceobjp = (ace_object_t *)acep; 558 559 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type, 560 sizeof (aceobjp->a_obj_type)); 561 bcopy(aceobjp->a_inherit_obj_type, 562 zobjacep->z_inherit_type, 563 sizeof (aceobjp->a_inherit_obj_type)); 564 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t)); 565 break; 566 default: 567 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t)); 568 } 569 570 aceptr = (zfs_ace_t *)((caddr_t)aceptr + 571 aclp->z_ops.ace_size(aceptr)); 572 } 573 574 *size = (caddr_t)aceptr - (caddr_t)z_acl; 575 576 return (0); 577 } 578 579 /* 580 * Copy ZFS ACEs to fixed size ace_t layout 581 */ 582 static void 583 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr, 584 void *datap, int filter) 585 { 586 uint64_t who; 587 uint32_t access_mask; 588 uint16_t iflags, type; 589 zfs_ace_hdr_t *zacep = NULL; 590 ace_t *acep = datap; 591 ace_object_t *objacep; 592 zfs_object_ace_t *zobjacep; 593 size_t ace_size; 594 uint16_t entry_type; 595 596 while (zacep = zfs_acl_next_ace(aclp, zacep, 597 &who, &access_mask, &iflags, &type)) { 598 599 switch (type) { 600 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 601 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 602 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 603 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 604 if (filter) { 605 continue; 606 } 607 zobjacep = (zfs_object_ace_t *)zacep; 608 objacep = (ace_object_t *)acep; 609 bcopy(zobjacep->z_object_type, 610 objacep->a_obj_type, 611 sizeof (zobjacep->z_object_type)); 612 bcopy(zobjacep->z_inherit_type, 613 objacep->a_inherit_obj_type, 614 sizeof (zobjacep->z_inherit_type)); 615 ace_size = sizeof (ace_object_t); 616 break; 617 default: 618 ace_size = sizeof (ace_t); 619 break; 620 } 621 622 entry_type = (iflags & ACE_TYPE_FLAGS); 623 if ((entry_type != ACE_OWNER && 624 entry_type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 625 entry_type != ACE_EVERYONE)) { 626 acep->a_who = zfs_fuid_map_id(zfsvfs, who, 627 cr, (entry_type & ACE_IDENTIFIER_GROUP) ? 628 ZFS_ACE_GROUP : ZFS_ACE_USER); 629 } else { 630 acep->a_who = (uid_t)(int64_t)who; 631 } 632 acep->a_access_mask = access_mask; 633 acep->a_flags = iflags; 634 acep->a_type = type; 635 acep = (ace_t *)((caddr_t)acep + ace_size); 636 } 637 } 638 639 static int 640 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep, 641 zfs_oldace_t *z_acl, int aclcnt, size_t *size) 642 { 643 int i; 644 zfs_oldace_t *aceptr = z_acl; 645 646 for (i = 0; i != aclcnt; i++, aceptr++) { 647 aceptr->z_access_mask = acep[i].a_access_mask; 648 aceptr->z_type = acep[i].a_type; 649 aceptr->z_flags = acep[i].a_flags; 650 aceptr->z_fuid = acep[i].a_who; 651 /* 652 * Make sure ACE is valid 653 */ 654 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type, 655 aceptr->z_flags) != B_TRUE) 656 return (EINVAL); 657 } 658 *size = (caddr_t)aceptr - (caddr_t)z_acl; 659 return (0); 660 } 661 662 /* 663 * convert old ACL format to new 664 */ 665 void 666 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp) 667 { 668 zfs_oldace_t *oldaclp; 669 int i; 670 uint16_t type, iflags; 671 uint32_t access_mask; 672 uint64_t who; 673 void *cookie = NULL; 674 zfs_acl_node_t *newaclnode; 675 676 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL); 677 /* 678 * First create the ACE in a contiguous piece of memory 679 * for zfs_copy_ace_2_fuid(). 680 * 681 * We only convert an ACL once, so this won't happen 682 * everytime. 683 */ 684 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count, 685 KM_SLEEP); 686 i = 0; 687 while (cookie = zfs_acl_next_ace(aclp, cookie, &who, 688 &access_mask, &iflags, &type)) { 689 oldaclp[i].z_flags = iflags; 690 oldaclp[i].z_type = type; 691 oldaclp[i].z_fuid = who; 692 oldaclp[i++].z_access_mask = access_mask; 693 } 694 695 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count * 696 sizeof (zfs_object_ace_t)); 697 aclp->z_ops = zfs_acl_fuid_ops; 698 VERIFY(zfs_copy_ace_2_fuid(ZTOV(zp)->v_type, aclp, oldaclp, 699 newaclnode->z_acldata, aclp->z_acl_count, 700 &newaclnode->z_size) == 0); 701 newaclnode->z_ace_count = aclp->z_acl_count; 702 aclp->z_version = ZFS_ACL_VERSION; 703 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t)); 704 705 /* 706 * Release all previous ACL nodes 707 */ 708 709 zfs_acl_release_nodes(aclp); 710 711 list_insert_head(&aclp->z_acl, newaclnode); 712 713 aclp->z_acl_bytes = newaclnode->z_size; 714 aclp->z_acl_count = newaclnode->z_ace_count; 715 716 } 717 718 /* 719 * Convert unix access mask to v4 access mask 720 */ 721 static uint32_t 722 zfs_unix_to_v4(uint32_t access_mask) 723 { 724 uint32_t new_mask = 0; 725 726 if (access_mask & S_IXOTH) 727 new_mask |= ACE_EXECUTE; 728 if (access_mask & S_IWOTH) 729 new_mask |= ACE_WRITE_DATA; 730 if (access_mask & S_IROTH) 731 new_mask |= ACE_READ_DATA; 732 return (new_mask); 733 } 734 735 static void 736 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask, 737 uint16_t access_type, uint64_t fuid, uint16_t entry_type) 738 { 739 uint16_t type = entry_type & ACE_TYPE_FLAGS; 740 741 aclp->z_ops.ace_mask_set(acep, access_mask); 742 aclp->z_ops.ace_type_set(acep, access_type); 743 aclp->z_ops.ace_flags_set(acep, entry_type); 744 if ((type != ACE_OWNER && type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 745 type != ACE_EVERYONE)) 746 aclp->z_ops.ace_who_set(acep, fuid); 747 } 748 749 /* 750 * Determine mode of file based on ACL. 751 * Also, create FUIDs for any User/Group ACEs 752 */ 753 static uint64_t 754 zfs_mode_fuid_compute(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, 755 zfs_fuid_info_t **fuidp, dmu_tx_t *tx) 756 { 757 int entry_type; 758 mode_t mode; 759 mode_t seen = 0; 760 zfs_ace_hdr_t *acep = NULL; 761 uint64_t who; 762 uint16_t iflags, type; 763 uint32_t access_mask; 764 765 mode = (zp->z_phys->zp_mode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX)); 766 767 while (acep = zfs_acl_next_ace(aclp, acep, &who, 768 &access_mask, &iflags, &type)) { 769 770 /* 771 * Skip over inherit only ACEs 772 */ 773 if (iflags & ACE_INHERIT_ONLY_ACE) 774 continue; 775 776 entry_type = (iflags & ACE_TYPE_FLAGS); 777 778 if (entry_type == ACE_OWNER) { 779 if ((access_mask & ACE_READ_DATA) && 780 (!(seen & S_IRUSR))) { 781 seen |= S_IRUSR; 782 if (type == ALLOW) { 783 mode |= S_IRUSR; 784 } 785 } 786 if ((access_mask & ACE_WRITE_DATA) && 787 (!(seen & S_IWUSR))) { 788 seen |= S_IWUSR; 789 if (type == ALLOW) { 790 mode |= S_IWUSR; 791 } 792 } 793 if ((access_mask & ACE_EXECUTE) && 794 (!(seen & S_IXUSR))) { 795 seen |= S_IXUSR; 796 if (type == ALLOW) { 797 mode |= S_IXUSR; 798 } 799 } 800 } else if (entry_type == OWNING_GROUP) { 801 if ((access_mask & ACE_READ_DATA) && 802 (!(seen & S_IRGRP))) { 803 seen |= S_IRGRP; 804 if (type == ALLOW) { 805 mode |= S_IRGRP; 806 } 807 } 808 if ((access_mask & ACE_WRITE_DATA) && 809 (!(seen & S_IWGRP))) { 810 seen |= S_IWGRP; 811 if (type == ALLOW) { 812 mode |= S_IWGRP; 813 } 814 } 815 if ((access_mask & ACE_EXECUTE) && 816 (!(seen & S_IXGRP))) { 817 seen |= S_IXGRP; 818 if (type == ALLOW) { 819 mode |= S_IXGRP; 820 } 821 } 822 } else if (entry_type == ACE_EVERYONE) { 823 if ((access_mask & ACE_READ_DATA)) { 824 if (!(seen & S_IRUSR)) { 825 seen |= S_IRUSR; 826 if (type == ALLOW) { 827 mode |= S_IRUSR; 828 } 829 } 830 if (!(seen & S_IRGRP)) { 831 seen |= S_IRGRP; 832 if (type == ALLOW) { 833 mode |= S_IRGRP; 834 } 835 } 836 if (!(seen & S_IROTH)) { 837 seen |= S_IROTH; 838 if (type == ALLOW) { 839 mode |= S_IROTH; 840 } 841 } 842 } 843 if ((access_mask & ACE_WRITE_DATA)) { 844 if (!(seen & S_IWUSR)) { 845 seen |= S_IWUSR; 846 if (type == ALLOW) { 847 mode |= S_IWUSR; 848 } 849 } 850 if (!(seen & S_IWGRP)) { 851 seen |= S_IWGRP; 852 if (type == ALLOW) { 853 mode |= S_IWGRP; 854 } 855 } 856 if (!(seen & S_IWOTH)) { 857 seen |= S_IWOTH; 858 if (type == ALLOW) { 859 mode |= S_IWOTH; 860 } 861 } 862 } 863 if ((access_mask & ACE_EXECUTE)) { 864 if (!(seen & S_IXUSR)) { 865 seen |= S_IXUSR; 866 if (type == ALLOW) { 867 mode |= S_IXUSR; 868 } 869 } 870 if (!(seen & S_IXGRP)) { 871 seen |= S_IXGRP; 872 if (type == ALLOW) { 873 mode |= S_IXGRP; 874 } 875 } 876 if (!(seen & S_IXOTH)) { 877 seen |= S_IXOTH; 878 if (type == ALLOW) { 879 mode |= S_IXOTH; 880 } 881 } 882 } 883 } 884 /* 885 * Now handle FUID create for user/group ACEs 886 */ 887 if (entry_type == 0 || entry_type == ACE_IDENTIFIER_GROUP) { 888 aclp->z_ops.ace_who_set(acep, 889 zfs_fuid_create(zp->z_zfsvfs, who, cr, 890 (entry_type == 0) ? ZFS_ACE_USER : ZFS_ACE_GROUP, 891 tx, fuidp)); 892 } 893 } 894 return (mode); 895 } 896 897 static zfs_acl_t * 898 zfs_acl_node_read_internal(znode_t *zp, boolean_t will_modify) 899 { 900 zfs_acl_t *aclp; 901 zfs_acl_node_t *aclnode; 902 903 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 904 905 /* 906 * Version 0 to 1 znode_acl_phys has the size/count fields swapped. 907 * Version 0 didn't have a size field, only a count. 908 */ 909 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 910 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_size; 911 aclp->z_acl_bytes = ZFS_ACL_SIZE(aclp->z_acl_count); 912 } else { 913 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count; 914 aclp->z_acl_bytes = zp->z_phys->zp_acl.z_acl_size; 915 } 916 917 aclnode = zfs_acl_node_alloc(will_modify ? aclp->z_acl_bytes : 0); 918 aclnode->z_ace_count = aclp->z_acl_count; 919 if (will_modify) { 920 bcopy(zp->z_phys->zp_acl.z_ace_data, aclnode->z_acldata, 921 aclp->z_acl_bytes); 922 } else { 923 aclnode->z_size = aclp->z_acl_bytes; 924 aclnode->z_acldata = &zp->z_phys->zp_acl.z_ace_data[0]; 925 } 926 927 list_insert_head(&aclp->z_acl, aclnode); 928 929 return (aclp); 930 } 931 932 /* 933 * Read an external acl object. 934 */ 935 static int 936 zfs_acl_node_read(znode_t *zp, zfs_acl_t **aclpp, boolean_t will_modify) 937 { 938 uint64_t extacl = zp->z_phys->zp_acl.z_acl_extern_obj; 939 zfs_acl_t *aclp; 940 size_t aclsize; 941 size_t acl_count; 942 zfs_acl_node_t *aclnode; 943 int error; 944 945 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 946 947 if (zp->z_phys->zp_acl.z_acl_extern_obj == 0) { 948 *aclpp = zfs_acl_node_read_internal(zp, will_modify); 949 return (0); 950 } 951 952 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 953 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 954 zfs_acl_phys_v0_t *zacl0 = 955 (zfs_acl_phys_v0_t *)&zp->z_phys->zp_acl; 956 957 aclsize = ZFS_ACL_SIZE(zacl0->z_acl_count); 958 acl_count = zacl0->z_acl_count; 959 } else { 960 aclsize = zp->z_phys->zp_acl.z_acl_size; 961 acl_count = zp->z_phys->zp_acl.z_acl_count; 962 if (aclsize == 0) 963 aclsize = acl_count * sizeof (zfs_ace_t); 964 } 965 aclnode = zfs_acl_node_alloc(aclsize); 966 list_insert_head(&aclp->z_acl, aclnode); 967 error = dmu_read(zp->z_zfsvfs->z_os, extacl, 0, 968 aclsize, aclnode->z_acldata); 969 aclnode->z_ace_count = acl_count; 970 aclp->z_acl_count = acl_count; 971 aclp->z_acl_bytes = aclsize; 972 973 if (error != 0) { 974 zfs_acl_free(aclp); 975 return (error); 976 } 977 978 *aclpp = aclp; 979 return (0); 980 } 981 982 /* 983 * common code for setting ACLs. 984 * 985 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl. 986 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's 987 * already checked the acl and knows whether to inherit. 988 */ 989 int 990 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, 991 zfs_fuid_info_t **fuidp, dmu_tx_t *tx) 992 { 993 int error; 994 znode_phys_t *zphys = zp->z_phys; 995 zfs_acl_phys_t *zacl = &zphys->zp_acl; 996 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 997 uint64_t aoid = zphys->zp_acl.z_acl_extern_obj; 998 uint64_t off = 0; 999 dmu_object_type_t otype; 1000 zfs_acl_node_t *aclnode; 1001 1002 ASSERT(MUTEX_HELD(&zp->z_lock)); 1003 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1004 1005 dmu_buf_will_dirty(zp->z_dbuf, tx); 1006 1007 zphys->zp_mode = zfs_mode_fuid_compute(zp, aclp, cr, fuidp, tx); 1008 1009 /* 1010 * Decide which opbject type to use. If we are forced to 1011 * use old ACL format than transform ACL into zfs_oldace_t 1012 * layout. 1013 */ 1014 if (!zfsvfs->z_use_fuids) { 1015 otype = DMU_OT_OLDACL; 1016 } else { 1017 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) && 1018 (zfsvfs->z_version >= ZPL_VERSION_FUID)) 1019 zfs_acl_xform(zp, aclp); 1020 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID); 1021 otype = DMU_OT_ACL; 1022 } 1023 1024 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1025 /* 1026 * If ACL was previously external and we are now 1027 * converting to new ACL format then release old 1028 * ACL object and create a new one. 1029 */ 1030 if (aoid && aclp->z_version != zacl->z_acl_version) { 1031 error = dmu_object_free(zfsvfs->z_os, 1032 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1033 if (error) 1034 return (error); 1035 aoid = 0; 1036 } 1037 if (aoid == 0) { 1038 aoid = dmu_object_alloc(zfsvfs->z_os, 1039 otype, aclp->z_acl_bytes, 1040 otype == DMU_OT_ACL ? DMU_OT_SYSACL : DMU_OT_NONE, 1041 otype == DMU_OT_ACL ? DN_MAX_BONUSLEN : 0, tx); 1042 } else { 1043 (void) dmu_object_set_blocksize(zfsvfs->z_os, aoid, 1044 aclp->z_acl_bytes, 0, tx); 1045 } 1046 zphys->zp_acl.z_acl_extern_obj = aoid; 1047 for (aclnode = list_head(&aclp->z_acl); aclnode; 1048 aclnode = list_next(&aclp->z_acl, aclnode)) { 1049 if (aclnode->z_ace_count == 0) 1050 continue; 1051 dmu_write(zfsvfs->z_os, aoid, off, 1052 aclnode->z_size, aclnode->z_acldata, tx); 1053 off += aclnode->z_size; 1054 } 1055 } else { 1056 void *start = zacl->z_ace_data; 1057 /* 1058 * Migrating back embedded? 1059 */ 1060 if (zphys->zp_acl.z_acl_extern_obj) { 1061 error = dmu_object_free(zfsvfs->z_os, 1062 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1063 if (error) 1064 return (error); 1065 zphys->zp_acl.z_acl_extern_obj = 0; 1066 } 1067 1068 for (aclnode = list_head(&aclp->z_acl); aclnode; 1069 aclnode = list_next(&aclp->z_acl, aclnode)) { 1070 if (aclnode->z_ace_count == 0) 1071 continue; 1072 bcopy(aclnode->z_acldata, start, aclnode->z_size); 1073 start = (caddr_t)start + aclnode->z_size; 1074 } 1075 } 1076 1077 /* 1078 * If Old version then swap count/bytes to match old 1079 * layout of znode_acl_phys_t. 1080 */ 1081 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1082 zphys->zp_acl.z_acl_size = aclp->z_acl_count; 1083 zphys->zp_acl.z_acl_count = aclp->z_acl_bytes; 1084 } else { 1085 zphys->zp_acl.z_acl_size = aclp->z_acl_bytes; 1086 zphys->zp_acl.z_acl_count = aclp->z_acl_count; 1087 } 1088 1089 zphys->zp_acl.z_acl_version = aclp->z_version; 1090 1091 /* 1092 * Replace ACL wide bits, but first clear them. 1093 */ 1094 zp->z_phys->zp_flags &= ~ZFS_ACL_WIDE_FLAGS; 1095 1096 zp->z_phys->zp_flags |= aclp->z_hints; 1097 1098 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0) 1099 zp->z_phys->zp_flags |= ZFS_ACL_TRIVIAL; 1100 1101 zfs_time_stamper_locked(zp, STATE_CHANGED, tx); 1102 return (0); 1103 } 1104 1105 /* 1106 * Update access mask for prepended ACE 1107 * 1108 * This applies the "groupmask" value for aclmode property. 1109 */ 1110 static void 1111 zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep, 1112 mode_t mode, uint64_t owner) 1113 { 1114 int rmask, wmask, xmask; 1115 int user_ace; 1116 uint16_t aceflags; 1117 uint32_t origmask, acepmask; 1118 uint64_t fuid; 1119 1120 aceflags = aclp->z_ops.ace_flags_get(acep); 1121 fuid = aclp->z_ops.ace_who_get(acep); 1122 origmask = aclp->z_ops.ace_mask_get(origacep); 1123 acepmask = aclp->z_ops.ace_mask_get(acep); 1124 1125 user_ace = (!(aceflags & 1126 (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP))); 1127 1128 if (user_ace && (fuid == owner)) { 1129 rmask = S_IRUSR; 1130 wmask = S_IWUSR; 1131 xmask = S_IXUSR; 1132 } else { 1133 rmask = S_IRGRP; 1134 wmask = S_IWGRP; 1135 xmask = S_IXGRP; 1136 } 1137 1138 if (origmask & ACE_READ_DATA) { 1139 if (mode & rmask) { 1140 acepmask &= ~ACE_READ_DATA; 1141 } else { 1142 acepmask |= ACE_READ_DATA; 1143 } 1144 } 1145 1146 if (origmask & ACE_WRITE_DATA) { 1147 if (mode & wmask) { 1148 acepmask &= ~ACE_WRITE_DATA; 1149 } else { 1150 acepmask |= ACE_WRITE_DATA; 1151 } 1152 } 1153 1154 if (origmask & ACE_APPEND_DATA) { 1155 if (mode & wmask) { 1156 acepmask &= ~ACE_APPEND_DATA; 1157 } else { 1158 acepmask |= ACE_APPEND_DATA; 1159 } 1160 } 1161 1162 if (origmask & ACE_EXECUTE) { 1163 if (mode & xmask) { 1164 acepmask &= ~ACE_EXECUTE; 1165 } else { 1166 acepmask |= ACE_EXECUTE; 1167 } 1168 } 1169 aclp->z_ops.ace_mask_set(acep, acepmask); 1170 } 1171 1172 /* 1173 * Apply mode to canonical six ACEs. 1174 */ 1175 static void 1176 zfs_acl_fixup_canonical_six(zfs_acl_t *aclp, mode_t mode) 1177 { 1178 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1179 void *acep; 1180 int maskoff = aclp->z_ops.ace_mask_off(); 1181 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1182 1183 ASSERT(aclnode != NULL); 1184 1185 acep = (void *)((caddr_t)aclnode->z_acldata + 1186 aclnode->z_size - (abstract_size * 6)); 1187 1188 /* 1189 * Fixup final ACEs to match the mode 1190 */ 1191 1192 adjust_ace_pair_common(acep, maskoff, abstract_size, 1193 (mode & 0700) >> 6); /* owner@ */ 1194 1195 acep = (caddr_t)acep + (abstract_size * 2); 1196 1197 adjust_ace_pair_common(acep, maskoff, abstract_size, 1198 (mode & 0070) >> 3); /* group@ */ 1199 1200 acep = (caddr_t)acep + (abstract_size * 2); 1201 adjust_ace_pair_common(acep, maskoff, 1202 abstract_size, mode); /* everyone@ */ 1203 } 1204 1205 1206 static int 1207 zfs_acl_ace_match(zfs_acl_t *aclp, void *acep, int allow_deny, 1208 int entry_type, int accessmask) 1209 { 1210 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1211 uint16_t type = aclp->z_ops.ace_type_get(acep); 1212 uint16_t flags = aclp->z_ops.ace_flags_get(acep); 1213 1214 return (mask == accessmask && type == allow_deny && 1215 ((flags & ACE_TYPE_FLAGS) == entry_type)); 1216 } 1217 1218 /* 1219 * Can prepended ACE be reused? 1220 */ 1221 static int 1222 zfs_reuse_deny(zfs_acl_t *aclp, void *acep, void *prevacep) 1223 { 1224 int okay_masks; 1225 uint16_t prevtype; 1226 uint16_t prevflags; 1227 uint16_t flags; 1228 uint32_t mask, prevmask; 1229 1230 if (prevacep == NULL) 1231 return (B_FALSE); 1232 1233 prevtype = aclp->z_ops.ace_type_get(prevacep); 1234 prevflags = aclp->z_ops.ace_flags_get(prevacep); 1235 flags = aclp->z_ops.ace_flags_get(acep); 1236 mask = aclp->z_ops.ace_mask_get(acep); 1237 prevmask = aclp->z_ops.ace_mask_get(prevacep); 1238 1239 if (prevtype != DENY) 1240 return (B_FALSE); 1241 1242 if (prevflags != (flags & ACE_IDENTIFIER_GROUP)) 1243 return (B_FALSE); 1244 1245 okay_masks = (mask & OKAY_MASK_BITS); 1246 1247 if (prevmask & ~okay_masks) 1248 return (B_FALSE); 1249 1250 return (B_TRUE); 1251 } 1252 1253 1254 /* 1255 * Insert new ACL node into chain of zfs_acl_node_t's 1256 * 1257 * This will result in two possible results. 1258 * 1. If the ACL is currently just a single zfs_acl_node and 1259 * we are prepending the entry then current acl node will have 1260 * a new node inserted above it. 1261 * 1262 * 2. If we are inserting in the middle of current acl node then 1263 * the current node will be split in two and new node will be inserted 1264 * in between the two split nodes. 1265 */ 1266 static zfs_acl_node_t * 1267 zfs_acl_ace_insert(zfs_acl_t *aclp, void *acep) 1268 { 1269 zfs_acl_node_t *newnode; 1270 zfs_acl_node_t *trailernode = NULL; 1271 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1272 int curr_idx = aclp->z_curr_node->z_ace_idx; 1273 int trailer_count; 1274 size_t oldsize; 1275 1276 newnode = zfs_acl_node_alloc(aclp->z_ops.ace_size(acep)); 1277 newnode->z_ace_count = 1; 1278 1279 oldsize = currnode->z_size; 1280 1281 if (curr_idx != 1) { 1282 trailernode = zfs_acl_node_alloc(0); 1283 trailernode->z_acldata = acep; 1284 1285 trailer_count = currnode->z_ace_count - curr_idx + 1; 1286 currnode->z_ace_count = curr_idx - 1; 1287 currnode->z_size = (caddr_t)acep - (caddr_t)currnode->z_acldata; 1288 trailernode->z_size = oldsize - currnode->z_size; 1289 trailernode->z_ace_count = trailer_count; 1290 } 1291 1292 aclp->z_acl_count += 1; 1293 aclp->z_acl_bytes += aclp->z_ops.ace_size(acep); 1294 1295 if (curr_idx == 1) 1296 list_insert_before(&aclp->z_acl, currnode, newnode); 1297 else 1298 list_insert_after(&aclp->z_acl, currnode, newnode); 1299 if (trailernode) { 1300 list_insert_after(&aclp->z_acl, newnode, trailernode); 1301 aclp->z_curr_node = trailernode; 1302 trailernode->z_ace_idx = 1; 1303 } 1304 1305 return (newnode); 1306 } 1307 1308 /* 1309 * Prepend deny ACE 1310 */ 1311 static void * 1312 zfs_acl_prepend_deny(znode_t *zp, zfs_acl_t *aclp, void *acep, 1313 mode_t mode) 1314 { 1315 zfs_acl_node_t *aclnode; 1316 void *newacep; 1317 uint64_t fuid; 1318 uint16_t flags; 1319 1320 aclnode = zfs_acl_ace_insert(aclp, acep); 1321 newacep = aclnode->z_acldata; 1322 fuid = aclp->z_ops.ace_who_get(acep); 1323 flags = aclp->z_ops.ace_flags_get(acep); 1324 zfs_set_ace(aclp, newacep, 0, DENY, fuid, (flags & ACE_TYPE_FLAGS)); 1325 zfs_acl_prepend_fixup(aclp, newacep, acep, mode, zp->z_phys->zp_uid); 1326 1327 return (newacep); 1328 } 1329 1330 /* 1331 * Split an inherited ACE into inherit_only ACE 1332 * and original ACE with inheritance flags stripped off. 1333 */ 1334 static void 1335 zfs_acl_split_ace(zfs_acl_t *aclp, zfs_ace_hdr_t *acep) 1336 { 1337 zfs_acl_node_t *aclnode; 1338 zfs_acl_node_t *currnode; 1339 void *newacep; 1340 uint16_t type, flags; 1341 uint32_t mask; 1342 uint64_t fuid; 1343 1344 type = aclp->z_ops.ace_type_get(acep); 1345 flags = aclp->z_ops.ace_flags_get(acep); 1346 mask = aclp->z_ops.ace_mask_get(acep); 1347 fuid = aclp->z_ops.ace_who_get(acep); 1348 1349 aclnode = zfs_acl_ace_insert(aclp, acep); 1350 newacep = aclnode->z_acldata; 1351 1352 aclp->z_ops.ace_type_set(newacep, type); 1353 aclp->z_ops.ace_flags_set(newacep, flags | ACE_INHERIT_ONLY_ACE); 1354 aclp->z_ops.ace_mask_set(newacep, mask); 1355 aclp->z_ops.ace_type_set(newacep, type); 1356 aclp->z_ops.ace_who_set(newacep, fuid); 1357 aclp->z_next_ace = acep; 1358 flags &= ~ALL_INHERIT; 1359 aclp->z_ops.ace_flags_set(acep, flags); 1360 currnode = zfs_acl_curr_node(aclp); 1361 ASSERT(currnode->z_ace_idx >= 1); 1362 currnode->z_ace_idx -= 1; 1363 } 1364 1365 /* 1366 * Are ACES started at index i, the canonical six ACES? 1367 */ 1368 static int 1369 zfs_have_canonical_six(zfs_acl_t *aclp) 1370 { 1371 void *acep; 1372 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1373 int i = 0; 1374 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1375 1376 ASSERT(aclnode != NULL); 1377 1378 if (aclnode->z_ace_count < 6) 1379 return (0); 1380 1381 acep = (void *)((caddr_t)aclnode->z_acldata + 1382 aclnode->z_size - (aclp->z_ops.ace_abstract_size() * 6)); 1383 1384 if ((zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1385 DENY, ACE_OWNER, 0) && 1386 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1387 ALLOW, ACE_OWNER, OWNER_ALLOW_MASK) && 1388 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), DENY, 1389 OWNING_GROUP, 0) && zfs_acl_ace_match(aclp, (caddr_t)acep + 1390 (abstract_size * i++), 1391 ALLOW, OWNING_GROUP, 0) && 1392 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1393 DENY, ACE_EVERYONE, EVERYONE_DENY_MASK) && 1394 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1395 ALLOW, ACE_EVERYONE, EVERYONE_ALLOW_MASK))) { 1396 return (1); 1397 } else { 1398 return (0); 1399 } 1400 } 1401 1402 1403 /* 1404 * Apply step 1g, to group entries 1405 * 1406 * Need to deal with corner case where group may have 1407 * greater permissions than owner. If so then limit 1408 * group permissions, based on what extra permissions 1409 * group has. 1410 */ 1411 static void 1412 zfs_fixup_group_entries(zfs_acl_t *aclp, void *acep, void *prevacep, 1413 mode_t mode) 1414 { 1415 uint32_t prevmask = aclp->z_ops.ace_mask_get(prevacep); 1416 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1417 uint16_t prevflags = aclp->z_ops.ace_flags_get(prevacep); 1418 mode_t extramode = (mode >> 3) & 07; 1419 mode_t ownermode = (mode >> 6); 1420 1421 if (prevflags & ACE_IDENTIFIER_GROUP) { 1422 1423 extramode &= ~ownermode; 1424 1425 if (extramode) { 1426 if (extramode & S_IROTH) { 1427 prevmask &= ~ACE_READ_DATA; 1428 mask &= ~ACE_READ_DATA; 1429 } 1430 if (extramode & S_IWOTH) { 1431 prevmask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1432 mask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1433 } 1434 if (extramode & S_IXOTH) { 1435 prevmask &= ~ACE_EXECUTE; 1436 mask &= ~ACE_EXECUTE; 1437 } 1438 } 1439 } 1440 aclp->z_ops.ace_mask_set(acep, mask); 1441 aclp->z_ops.ace_mask_set(prevacep, prevmask); 1442 } 1443 1444 /* 1445 * Apply the chmod algorithm as described 1446 * in PSARC/2002/240 1447 */ 1448 static void 1449 zfs_acl_chmod(znode_t *zp, uint64_t mode, zfs_acl_t *aclp) 1450 { 1451 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1452 void *acep = NULL, *prevacep = NULL; 1453 uint64_t who; 1454 int i; 1455 int entry_type; 1456 int reuse_deny; 1457 int need_canonical_six = 1; 1458 uint16_t iflags, type; 1459 uint32_t access_mask; 1460 1461 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1462 ASSERT(MUTEX_HELD(&zp->z_lock)); 1463 1464 aclp->z_hints = (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 1465 1466 /* 1467 * If discard then just discard all ACL nodes which 1468 * represent the ACEs. 1469 * 1470 * New owner@/group@/everone@ ACEs will be added 1471 * later. 1472 */ 1473 if (zfsvfs->z_acl_mode == ZFS_ACL_DISCARD) 1474 zfs_acl_release_nodes(aclp); 1475 1476 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 1477 &iflags, &type)) { 1478 1479 entry_type = (iflags & ACE_TYPE_FLAGS); 1480 iflags = (iflags & ALL_INHERIT); 1481 1482 if ((type != ALLOW && type != DENY) || 1483 (iflags & ACE_INHERIT_ONLY_ACE)) { 1484 if (iflags) 1485 aclp->z_hints |= ZFS_INHERIT_ACE; 1486 switch (type) { 1487 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1488 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1489 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1490 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1491 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 1492 break; 1493 } 1494 goto nextace; 1495 } 1496 1497 /* 1498 * Need to split ace into two? 1499 */ 1500 if ((iflags & (ACE_FILE_INHERIT_ACE| 1501 ACE_DIRECTORY_INHERIT_ACE)) && 1502 (!(iflags & ACE_INHERIT_ONLY_ACE))) { 1503 zfs_acl_split_ace(aclp, acep); 1504 aclp->z_hints |= ZFS_INHERIT_ACE; 1505 goto nextace; 1506 } 1507 1508 if (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE || 1509 (entry_type == OWNING_GROUP)) { 1510 access_mask &= ~OGE_CLEAR; 1511 aclp->z_ops.ace_mask_set(acep, access_mask); 1512 goto nextace; 1513 } else { 1514 reuse_deny = B_TRUE; 1515 if (type == ALLOW) { 1516 1517 /* 1518 * Check preceding ACE if any, to see 1519 * if we need to prepend a DENY ACE. 1520 * This is only applicable when the acl_mode 1521 * property == groupmask. 1522 */ 1523 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK) { 1524 1525 reuse_deny = zfs_reuse_deny(aclp, acep, 1526 prevacep); 1527 1528 if (!reuse_deny) { 1529 prevacep = 1530 zfs_acl_prepend_deny(zp, 1531 aclp, acep, mode); 1532 } else { 1533 zfs_acl_prepend_fixup( 1534 aclp, prevacep, 1535 acep, mode, 1536 zp->z_phys->zp_uid); 1537 } 1538 zfs_fixup_group_entries(aclp, acep, 1539 prevacep, mode); 1540 1541 } 1542 } 1543 } 1544 nextace: 1545 prevacep = acep; 1546 } 1547 1548 /* 1549 * Check out last six aces, if we have six. 1550 */ 1551 1552 if (aclp->z_acl_count >= 6) { 1553 if (zfs_have_canonical_six(aclp)) { 1554 need_canonical_six = 0; 1555 } 1556 } 1557 1558 if (need_canonical_six) { 1559 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1560 void *zacep; 1561 zfs_acl_node_t *aclnode = 1562 zfs_acl_node_alloc(abstract_size * 6); 1563 1564 aclnode->z_size = abstract_size * 6; 1565 aclnode->z_ace_count = 6; 1566 aclp->z_acl_bytes += aclnode->z_size; 1567 list_insert_tail(&aclp->z_acl, aclnode); 1568 1569 zacep = aclnode->z_acldata; 1570 1571 i = 0; 1572 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1573 0, DENY, -1, ACE_OWNER); 1574 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1575 OWNER_ALLOW_MASK, ALLOW, -1, ACE_OWNER); 1576 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1577 DENY, -1, OWNING_GROUP); 1578 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1579 ALLOW, -1, OWNING_GROUP); 1580 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1581 EVERYONE_DENY_MASK, DENY, -1, ACE_EVERYONE); 1582 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1583 EVERYONE_ALLOW_MASK, ALLOW, -1, ACE_EVERYONE); 1584 aclp->z_acl_count += 6; 1585 } 1586 1587 zfs_acl_fixup_canonical_six(aclp, mode); 1588 } 1589 1590 int 1591 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode) 1592 { 1593 int error; 1594 1595 mutex_enter(&zp->z_lock); 1596 mutex_enter(&zp->z_acl_lock); 1597 *aclp = NULL; 1598 error = zfs_acl_node_read(zp, aclp, B_TRUE); 1599 if (error == 0) 1600 zfs_acl_chmod(zp, mode, *aclp); 1601 mutex_exit(&zp->z_acl_lock); 1602 mutex_exit(&zp->z_lock); 1603 return (error); 1604 } 1605 1606 /* 1607 * strip off write_owner and write_acl 1608 */ 1609 static void 1610 zfs_restricted_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep) 1611 { 1612 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1613 1614 if ((zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) && 1615 (aclp->z_ops.ace_type_get(acep) == ALLOW)) { 1616 mask &= ~RESTRICTED_CLEAR; 1617 aclp->z_ops.ace_mask_set(acep, mask); 1618 } 1619 } 1620 1621 /* 1622 * Should ACE be inherited? 1623 */ 1624 static int 1625 zfs_ace_can_use(znode_t *zp, uint16_t acep_flags) 1626 { 1627 int vtype = ZTOV(zp)->v_type; 1628 int iflags = (acep_flags & 0xf); 1629 1630 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE)) 1631 return (1); 1632 else if (iflags & ACE_FILE_INHERIT_ACE) 1633 return (!((vtype == VDIR) && 1634 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE))); 1635 return (0); 1636 } 1637 1638 /* 1639 * inherit inheritable ACEs from parent 1640 */ 1641 static zfs_acl_t * 1642 zfs_acl_inherit(znode_t *zp, zfs_acl_t *paclp, boolean_t *need_chmod) 1643 { 1644 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1645 void *pacep; 1646 void *acep, *acep2; 1647 zfs_acl_node_t *aclnode, *aclnode2; 1648 zfs_acl_t *aclp = NULL; 1649 uint64_t who; 1650 uint32_t access_mask; 1651 uint16_t iflags, newflags, type; 1652 size_t ace_size; 1653 void *data1, *data2; 1654 size_t data1sz, data2sz; 1655 enum vtype vntype = ZTOV(zp)->v_type; 1656 1657 *need_chmod = B_TRUE; 1658 pacep = NULL; 1659 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1660 if (zfsvfs->z_acl_inherit != ZFS_ACL_DISCARD) { 1661 while (pacep = zfs_acl_next_ace(paclp, pacep, &who, 1662 &access_mask, &iflags, &type)) { 1663 1664 if (zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW && 1665 type == ALLOW) 1666 continue; 1667 1668 ace_size = aclp->z_ops.ace_size(pacep); 1669 1670 if (!zfs_ace_can_use(zp, iflags)) 1671 continue; 1672 1673 /* 1674 * If owner@, group@, or everyone@ inheritable 1675 * then zfs_acl_chmod() isn't needed. 1676 */ 1677 if (zfsvfs->z_acl_inherit == 1678 ZFS_ACL_PASSTHROUGH && 1679 ((iflags & (ACE_OWNER|ACE_EVERYONE)) || 1680 ((iflags & OWNING_GROUP) == 1681 OWNING_GROUP)) && (vntype == VREG || 1682 (vntype == VDIR && 1683 (iflags & ACE_DIRECTORY_INHERIT_ACE)))) 1684 *need_chmod = B_FALSE; 1685 1686 aclnode = zfs_acl_node_alloc(ace_size); 1687 list_insert_tail(&aclp->z_acl, aclnode); 1688 acep = aclnode->z_acldata; 1689 zfs_set_ace(aclp, acep, access_mask, type, 1690 who, iflags|ACE_INHERITED_ACE); 1691 1692 /* 1693 * Copy special opaque data if any 1694 */ 1695 if ((data1sz = paclp->z_ops.ace_data(pacep, 1696 &data1)) != 0) { 1697 VERIFY((data2sz = aclp->z_ops.ace_data(acep, 1698 &data2)) == data1sz); 1699 bcopy(data1, data2, data2sz); 1700 } 1701 aclp->z_acl_count++; 1702 aclnode->z_ace_count++; 1703 aclp->z_acl_bytes += aclnode->z_size; 1704 newflags = aclp->z_ops.ace_flags_get(acep); 1705 1706 if (vntype == VDIR) 1707 aclp->z_hints |= ZFS_INHERIT_ACE; 1708 1709 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || 1710 (vntype != VDIR)) { 1711 newflags &= ~ALL_INHERIT; 1712 aclp->z_ops.ace_flags_set(acep, 1713 newflags|ACE_INHERITED_ACE); 1714 zfs_restricted_update(zfsvfs, aclp, acep); 1715 continue; 1716 } 1717 1718 ASSERT(vntype == VDIR); 1719 1720 newflags = aclp->z_ops.ace_flags_get(acep); 1721 if ((iflags & (ACE_FILE_INHERIT_ACE | 1722 ACE_DIRECTORY_INHERIT_ACE)) != 1723 ACE_FILE_INHERIT_ACE) { 1724 aclnode2 = zfs_acl_node_alloc(ace_size); 1725 list_insert_tail(&aclp->z_acl, aclnode2); 1726 acep2 = aclnode2->z_acldata; 1727 zfs_set_ace(aclp, acep2, 1728 access_mask, type, who, 1729 iflags|ACE_INHERITED_ACE); 1730 newflags |= ACE_INHERIT_ONLY_ACE; 1731 aclp->z_ops.ace_flags_set(acep, newflags); 1732 newflags &= ~ALL_INHERIT; 1733 aclp->z_ops.ace_flags_set(acep2, 1734 newflags|ACE_INHERITED_ACE); 1735 1736 /* 1737 * Copy special opaque data if any 1738 */ 1739 if ((data1sz = aclp->z_ops.ace_data(acep, 1740 &data1)) != 0) { 1741 VERIFY((data2sz = 1742 aclp->z_ops.ace_data(acep2, 1743 &data2)) == data1sz); 1744 bcopy(data1, data2, data1sz); 1745 } 1746 aclp->z_acl_count++; 1747 aclnode2->z_ace_count++; 1748 aclp->z_acl_bytes += aclnode->z_size; 1749 zfs_restricted_update(zfsvfs, aclp, acep2); 1750 } else { 1751 newflags |= ACE_INHERIT_ONLY_ACE; 1752 aclp->z_ops.ace_flags_set(acep, 1753 newflags|ACE_INHERITED_ACE); 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, fuid, fgid; 1770 int error; 1771 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1772 zfs_acl_t *aclp = NULL; 1773 zfs_acl_t *paclp; 1774 xvattr_t *xvap = (xvattr_t *)vap; 1775 gid_t gid; 1776 boolean_t need_chmod = B_TRUE; 1777 1778 if (setaclp) 1779 aclp = setaclp; 1780 1781 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1782 1783 /* 1784 * Determine uid and gid. 1785 */ 1786 if ((flag & (IS_ROOT_NODE | IS_REPLAY)) || 1787 ((flag & IS_XATTR) && (vap->va_type == VDIR))) { 1788 fuid = zfs_fuid_create(zfsvfs, vap->va_uid, cr, 1789 ZFS_OWNER, tx, fuidp); 1790 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1791 ZFS_GROUP, tx, fuidp); 1792 gid = vap->va_gid; 1793 } else { 1794 fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER, tx, cr, fuidp); 1795 fgid = 0; 1796 if (vap->va_mask & AT_GID) { 1797 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1798 ZFS_GROUP, tx, fuidp); 1799 gid = vap->va_gid; 1800 if (fgid != parent->z_phys->zp_gid && 1801 !groupmember(vap->va_gid, cr) && 1802 secpolicy_vnode_create_gid(cr) != 0) 1803 fgid = 0; 1804 } 1805 if (fgid == 0) { 1806 if (parent->z_phys->zp_mode & S_ISGID) { 1807 fgid = parent->z_phys->zp_gid; 1808 gid = zfs_fuid_map_id(zfsvfs, fgid, 1809 cr, ZFS_GROUP); 1810 } else { 1811 fgid = zfs_fuid_create_cred(zfsvfs, 1812 ZFS_GROUP, tx, cr, fuidp); 1813 gid = crgetgid(cr); 1814 } 1815 } 1816 } 1817 1818 /* 1819 * If we're creating a directory, and the parent directory has the 1820 * set-GID bit set, set in on the new directory. 1821 * Otherwise, if the user is neither privileged nor a member of the 1822 * file's new group, clear the file's set-GID bit. 1823 */ 1824 1825 if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR)) { 1826 mode |= S_ISGID; 1827 } else { 1828 if ((mode & S_ISGID) && 1829 secpolicy_vnode_setids_setgids(cr, gid) != 0) 1830 mode &= ~S_ISGID; 1831 } 1832 1833 zp->z_phys->zp_uid = fuid; 1834 zp->z_phys->zp_gid = fgid; 1835 zp->z_phys->zp_mode = mode; 1836 1837 if (aclp == NULL) { 1838 mutex_enter(&parent->z_lock); 1839 if ((ZTOV(parent)->v_type == VDIR && 1840 parent->z_phys->zp_flags & ZFS_INHERIT_ACE)) { 1841 mutex_enter(&parent->z_acl_lock); 1842 VERIFY(0 == zfs_acl_node_read(parent, &paclp, B_FALSE)); 1843 mutex_exit(&parent->z_acl_lock); 1844 aclp = zfs_acl_inherit(zp, paclp, &need_chmod); 1845 zfs_acl_free(paclp); 1846 } else { 1847 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1848 } 1849 mutex_exit(&parent->z_lock); 1850 mutex_enter(&zp->z_lock); 1851 mutex_enter(&zp->z_acl_lock); 1852 if (need_chmod) 1853 zfs_acl_chmod(zp, mode, aclp); 1854 } else { 1855 mutex_enter(&zp->z_lock); 1856 mutex_enter(&zp->z_acl_lock); 1857 } 1858 1859 /* Force auto_inherit on all new directory objects */ 1860 if (vap->va_type == VDIR) 1861 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 1862 1863 error = zfs_aclset_common(zp, aclp, cr, fuidp, tx); 1864 1865 /* Set optional attributes if any */ 1866 if (vap->va_mask & AT_XVATTR) 1867 zfs_xvattr_set(zp, xvap); 1868 1869 mutex_exit(&zp->z_lock); 1870 mutex_exit(&zp->z_acl_lock); 1871 ASSERT3U(error, ==, 0); 1872 1873 if (aclp != setaclp) 1874 zfs_acl_free(aclp); 1875 } 1876 1877 /* 1878 * Retrieve a files ACL 1879 */ 1880 int 1881 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1882 { 1883 zfs_acl_t *aclp; 1884 ulong_t mask; 1885 int error; 1886 int count = 0; 1887 int largeace = 0; 1888 1889 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1890 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1891 1892 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)) 1893 return (error); 1894 1895 if (mask == 0) 1896 return (ENOSYS); 1897 1898 mutex_enter(&zp->z_acl_lock); 1899 1900 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 1901 if (error != 0) { 1902 mutex_exit(&zp->z_acl_lock); 1903 return (error); 1904 } 1905 1906 /* 1907 * Scan ACL to determine number of ACEs 1908 */ 1909 if ((zp->z_phys->zp_flags & ZFS_ACL_OBJ_ACE) && 1910 !(mask & VSA_ACE_ALLTYPES)) { 1911 void *zacep = NULL; 1912 uint64_t who; 1913 uint32_t access_mask; 1914 uint16_t type, iflags; 1915 1916 while (zacep = zfs_acl_next_ace(aclp, zacep, 1917 &who, &access_mask, &iflags, &type)) { 1918 switch (type) { 1919 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1920 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1921 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1922 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1923 largeace++; 1924 continue; 1925 default: 1926 count++; 1927 } 1928 } 1929 vsecp->vsa_aclcnt = count; 1930 } else 1931 count = aclp->z_acl_count; 1932 1933 if (mask & VSA_ACECNT) { 1934 vsecp->vsa_aclcnt = count; 1935 } 1936 1937 if (mask & VSA_ACE) { 1938 size_t aclsz; 1939 1940 zfs_acl_node_t *aclnode = list_head(&aclp->z_acl); 1941 1942 aclsz = count * sizeof (ace_t) + 1943 sizeof (ace_object_t) * largeace; 1944 1945 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 1946 vsecp->vsa_aclentsz = aclsz; 1947 1948 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 1949 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr, 1950 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 1951 else { 1952 bcopy(aclnode->z_acldata, vsecp->vsa_aclentp, 1953 count * sizeof (ace_t)); 1954 } 1955 } 1956 if (mask & VSA_ACE_ACLFLAGS) { 1957 vsecp->vsa_aclflags = 0; 1958 if (zp->z_phys->zp_flags & ZFS_ACL_DEFAULTED) 1959 vsecp->vsa_aclflags |= ACL_DEFAULTED; 1960 if (zp->z_phys->zp_flags & ZFS_ACL_PROTECTED) 1961 vsecp->vsa_aclflags |= ACL_PROTECTED; 1962 if (zp->z_phys->zp_flags & ZFS_ACL_AUTO_INHERIT) 1963 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 1964 } 1965 1966 mutex_exit(&zp->z_acl_lock); 1967 1968 zfs_acl_free(aclp); 1969 1970 return (0); 1971 } 1972 1973 int 1974 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type, 1975 vsecattr_t *vsecp, zfs_acl_t **zaclp) 1976 { 1977 zfs_acl_t *aclp; 1978 zfs_acl_node_t *aclnode; 1979 int aclcnt = vsecp->vsa_aclcnt; 1980 int error; 1981 1982 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 1983 return (EINVAL); 1984 1985 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 1986 1987 aclp->z_hints = 0; 1988 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 1989 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1990 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp, 1991 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 1992 aclcnt, &aclnode->z_size)) != 0) { 1993 zfs_acl_free(aclp); 1994 zfs_acl_node_free(aclnode); 1995 return (error); 1996 } 1997 } else { 1998 if ((error = zfs_copy_ace_2_fuid(obj_type, aclp, 1999 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 2000 &aclnode->z_size)) != 0) { 2001 zfs_acl_free(aclp); 2002 zfs_acl_node_free(aclnode); 2003 return (error); 2004 } 2005 } 2006 aclp->z_acl_bytes = aclnode->z_size; 2007 aclnode->z_ace_count = aclcnt; 2008 aclp->z_acl_count = aclcnt; 2009 list_insert_head(&aclp->z_acl, aclnode); 2010 2011 /* 2012 * If flags are being set then add them to z_hints 2013 */ 2014 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2015 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2016 aclp->z_hints |= ZFS_ACL_PROTECTED; 2017 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2018 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2019 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2020 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2021 } 2022 2023 *zaclp = aclp; 2024 2025 return (0); 2026 } 2027 2028 /* 2029 * Set a files ACL 2030 */ 2031 int 2032 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2033 { 2034 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2035 zilog_t *zilog = zfsvfs->z_log; 2036 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2037 dmu_tx_t *tx; 2038 int error; 2039 zfs_acl_t *aclp; 2040 zfs_fuid_info_t *fuidp = NULL; 2041 2042 if (mask == 0) 2043 return (ENOSYS); 2044 2045 if (zp->z_phys->zp_flags & ZFS_IMMUTABLE) 2046 return (EPERM); 2047 2048 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) 2049 return (error); 2050 2051 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, &aclp); 2052 if (error) 2053 return (error); 2054 2055 /* 2056 * If ACL wide flags aren't being set then preserve any 2057 * existing flags. 2058 */ 2059 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2060 aclp->z_hints |= (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 2061 } 2062 top: 2063 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) { 2064 zfs_acl_free(aclp); 2065 return (error); 2066 } 2067 2068 mutex_enter(&zp->z_lock); 2069 mutex_enter(&zp->z_acl_lock); 2070 2071 tx = dmu_tx_create(zfsvfs->z_os); 2072 dmu_tx_hold_bonus(tx, zp->z_id); 2073 2074 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 2075 /* Are we upgrading ACL? */ 2076 if (zfsvfs->z_version <= ZPL_VERSION_FUID && 2077 zp->z_phys->zp_acl.z_acl_version == 2078 ZFS_ACL_VERSION_INITIAL) { 2079 dmu_tx_hold_free(tx, 2080 zp->z_phys->zp_acl.z_acl_extern_obj, 2081 0, DMU_OBJECT_END); 2082 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2083 0, aclp->z_acl_bytes); 2084 } else { 2085 dmu_tx_hold_write(tx, 2086 zp->z_phys->zp_acl.z_acl_extern_obj, 2087 0, aclp->z_acl_bytes); 2088 } 2089 } else if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2090 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2091 } 2092 if (aclp->z_has_fuids) { 2093 if (zfsvfs->z_fuid_obj == 0) { 2094 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 2095 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2096 FUID_SIZE_ESTIMATE(zfsvfs)); 2097 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); 2098 } else { 2099 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj); 2100 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0, 2101 FUID_SIZE_ESTIMATE(zfsvfs)); 2102 } 2103 } 2104 2105 error = dmu_tx_assign(tx, zfsvfs->z_assign); 2106 if (error) { 2107 mutex_exit(&zp->z_acl_lock); 2108 mutex_exit(&zp->z_lock); 2109 2110 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2111 dmu_tx_wait(tx); 2112 dmu_tx_abort(tx); 2113 goto top; 2114 } 2115 dmu_tx_abort(tx); 2116 zfs_acl_free(aclp); 2117 return (error); 2118 } 2119 2120 error = zfs_aclset_common(zp, aclp, cr, &fuidp, tx); 2121 ASSERT(error == 0); 2122 2123 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2124 2125 if (fuidp) 2126 zfs_fuid_info_free(fuidp); 2127 zfs_acl_free(aclp); 2128 dmu_tx_commit(tx); 2129 done: 2130 mutex_exit(&zp->z_acl_lock); 2131 mutex_exit(&zp->z_lock); 2132 2133 return (error); 2134 } 2135 2136 /* 2137 * working_mode returns the permissions that were not granted 2138 */ 2139 static int 2140 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2141 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr) 2142 { 2143 zfs_acl_t *aclp; 2144 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2145 int error; 2146 uid_t uid = crgetuid(cr); 2147 uint64_t who; 2148 uint16_t type, iflags; 2149 uint16_t entry_type; 2150 uint32_t access_mask; 2151 uint32_t deny_mask = 0; 2152 zfs_ace_hdr_t *acep = NULL; 2153 boolean_t checkit; 2154 uid_t fowner; 2155 uid_t gowner; 2156 2157 /* 2158 * Short circuit empty requests 2159 */ 2160 if (v4_mode == 0) 2161 return (0); 2162 2163 *check_privs = B_TRUE; 2164 2165 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ 2166 *working_mode = 0; 2167 return (0); 2168 } 2169 2170 *working_mode = v4_mode; 2171 2172 if ((v4_mode & WRITE_MASK) && 2173 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && 2174 (!IS_DEVVP(ZTOV(zp)))) { 2175 *check_privs = B_FALSE; 2176 return (EROFS); 2177 } 2178 2179 /* 2180 * Only check for READONLY on non-directories. 2181 */ 2182 if ((v4_mode & WRITE_MASK_DATA) && 2183 (((ZTOV(zp)->v_type != VDIR) && 2184 (zp->z_phys->zp_flags & (ZFS_READONLY | ZFS_IMMUTABLE))) || 2185 (ZTOV(zp)->v_type == VDIR && 2186 (zp->z_phys->zp_flags & ZFS_IMMUTABLE)))) { 2187 *check_privs = B_FALSE; 2188 return (EPERM); 2189 } 2190 2191 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2192 (zp->z_phys->zp_flags & ZFS_NOUNLINK)) { 2193 *check_privs = B_FALSE; 2194 return (EPERM); 2195 } 2196 2197 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2198 (zp->z_phys->zp_flags & ZFS_AV_QUARANTINED))) { 2199 *check_privs = B_FALSE; 2200 return (EACCES); 2201 } 2202 2203 /* 2204 * The caller requested that the ACL check be skipped. This 2205 * would only happen if the caller checked VOP_ACCESS() with a 2206 * 32 bit ACE mask and already had the appropriate permissions. 2207 */ 2208 if (skipaclchk) { 2209 *working_mode = 0; 2210 return (0); 2211 } 2212 2213 zfs_fuid_map_ids(zp, cr, &fowner, &gowner); 2214 2215 mutex_enter(&zp->z_acl_lock); 2216 2217 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 2218 if (error != 0) { 2219 mutex_exit(&zp->z_acl_lock); 2220 return (error); 2221 } 2222 2223 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2224 &iflags, &type)) { 2225 2226 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE)) 2227 continue; 2228 2229 entry_type = (iflags & ACE_TYPE_FLAGS); 2230 2231 checkit = B_FALSE; 2232 2233 switch (entry_type) { 2234 case ACE_OWNER: 2235 if (uid == fowner) 2236 checkit = B_TRUE; 2237 break; 2238 case OWNING_GROUP: 2239 who = gowner; 2240 /*FALLTHROUGH*/ 2241 case ACE_IDENTIFIER_GROUP: 2242 checkit = zfs_groupmember(zfsvfs, who, cr); 2243 break; 2244 case ACE_EVERYONE: 2245 checkit = B_TRUE; 2246 break; 2247 2248 /* USER Entry */ 2249 default: 2250 if (entry_type == 0) { 2251 uid_t newid; 2252 2253 newid = zfs_fuid_map_id(zfsvfs, who, cr, 2254 ZFS_ACE_USER); 2255 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2256 uid == newid) 2257 checkit = B_TRUE; 2258 break; 2259 } else { 2260 zfs_acl_free(aclp); 2261 mutex_exit(&zp->z_acl_lock); 2262 return (EIO); 2263 } 2264 } 2265 2266 if (checkit) { 2267 uint32_t mask_matched = (access_mask & *working_mode); 2268 2269 if (mask_matched) { 2270 if (type == DENY) 2271 deny_mask |= mask_matched; 2272 2273 *working_mode &= ~mask_matched; 2274 } 2275 } 2276 2277 /* Are we done? */ 2278 if (*working_mode == 0) 2279 break; 2280 } 2281 2282 mutex_exit(&zp->z_acl_lock); 2283 zfs_acl_free(aclp); 2284 2285 /* Put the found 'denies' back on the working mode */ 2286 if (deny_mask) { 2287 *working_mode |= deny_mask; 2288 return (EACCES); 2289 } else if (*working_mode) { 2290 return (-1); 2291 } 2292 2293 return (0); 2294 } 2295 2296 static int 2297 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2298 cred_t *cr) 2299 { 2300 if (*working_mode != ACE_WRITE_DATA) 2301 return (EACCES); 2302 2303 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2304 check_privs, B_FALSE, cr)); 2305 } 2306 2307 /* 2308 * Determine whether Access should be granted/denied, invoking least 2309 * priv subsytem when a deny is determined. 2310 */ 2311 int 2312 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) 2313 { 2314 uint32_t working_mode; 2315 int error; 2316 int is_attr; 2317 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2318 boolean_t check_privs; 2319 znode_t *xzp; 2320 znode_t *check_zp = zp; 2321 2322 is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && 2323 (ZTOV(zp)->v_type == VDIR)); 2324 2325 /* 2326 * If attribute then validate against base file 2327 */ 2328 if (is_attr) { 2329 if ((error = zfs_zget(zp->z_zfsvfs, 2330 zp->z_phys->zp_parent, &xzp)) != 0) { 2331 return (error); 2332 } 2333 2334 check_zp = xzp; 2335 2336 /* 2337 * fixup mode to map to xattr perms 2338 */ 2339 2340 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2341 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2342 mode |= ACE_WRITE_NAMED_ATTRS; 2343 } 2344 2345 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2346 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2347 mode |= ACE_READ_NAMED_ATTRS; 2348 } 2349 } 2350 2351 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2352 &check_privs, skipaclchk, cr)) == 0) { 2353 if (is_attr) 2354 VN_RELE(ZTOV(xzp)); 2355 return (0); 2356 } 2357 2358 if (error && !check_privs) { 2359 if (is_attr) 2360 VN_RELE(ZTOV(xzp)); 2361 return (error); 2362 } 2363 2364 if (error && (flags & V_APPEND)) { 2365 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr); 2366 } 2367 2368 if (error && check_privs) { 2369 uid_t owner; 2370 mode_t checkmode = 0; 2371 2372 owner = zfs_fuid_map_id(zfsvfs, check_zp->z_phys->zp_uid, cr, 2373 ZFS_OWNER); 2374 2375 /* 2376 * First check for implicit owner permission on 2377 * read_acl/read_attributes 2378 */ 2379 2380 error = 0; 2381 ASSERT(working_mode != 0); 2382 2383 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2384 owner == crgetuid(cr))) 2385 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2386 2387 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2388 ACE_READ_ACL|ACE_READ_ATTRIBUTES)) 2389 checkmode |= VREAD; 2390 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2391 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES)) 2392 checkmode |= VWRITE; 2393 if (working_mode & ACE_EXECUTE) 2394 checkmode |= VEXEC; 2395 2396 if (checkmode) 2397 error = secpolicy_vnode_access(cr, ZTOV(check_zp), 2398 owner, checkmode); 2399 2400 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2401 error = secpolicy_vnode_create_gid(cr); 2402 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2403 error = secpolicy_vnode_setdac(cr, owner); 2404 2405 if (error == 0 && (working_mode & 2406 (ACE_DELETE|ACE_DELETE_CHILD))) 2407 error = secpolicy_vnode_remove(cr); 2408 2409 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) 2410 error = secpolicy_vnode_owner(cr, owner); 2411 2412 if (error == 0) { 2413 /* 2414 * See if any bits other than those already checked 2415 * for are still present. If so then return EACCES 2416 */ 2417 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2418 error = EACCES; 2419 } 2420 } 2421 } 2422 2423 if (is_attr) 2424 VN_RELE(ZTOV(xzp)); 2425 2426 return (error); 2427 } 2428 2429 /* 2430 * Translate traditional unix VREAD/VWRITE/VEXEC mode into 2431 * native ACL format and call zfs_zaccess() 2432 */ 2433 int 2434 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr) 2435 { 2436 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr)); 2437 } 2438 2439 /* 2440 * Access function for secpolicy_vnode_setattr 2441 */ 2442 int 2443 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr) 2444 { 2445 int v4_mode = zfs_unix_to_v4(mode >> 6); 2446 2447 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr)); 2448 } 2449 2450 static int 2451 zfs_delete_final_check(znode_t *zp, znode_t *dzp, 2452 mode_t missing_perms, cred_t *cr) 2453 { 2454 int error; 2455 uid_t downer; 2456 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2457 2458 downer = zfs_fuid_map_id(zfsvfs, dzp->z_phys->zp_uid, cr, ZFS_OWNER); 2459 2460 error = secpolicy_vnode_access(cr, ZTOV(dzp), downer, missing_perms); 2461 2462 if (error == 0) 2463 error = zfs_sticky_remove_access(dzp, zp, cr); 2464 2465 return (error); 2466 } 2467 2468 /* 2469 * Determine whether Access should be granted/deny, without 2470 * consulting least priv subsystem. 2471 * 2472 * 2473 * The following chart is the recommended NFSv4 enforcement for 2474 * ability to delete an object. 2475 * 2476 * ------------------------------------------------------- 2477 * | Parent Dir | Target Object Permissions | 2478 * | permissions | | 2479 * ------------------------------------------------------- 2480 * | | ACL Allows | ACL Denies| Delete | 2481 * | | Delete | Delete | unspecified| 2482 * ------------------------------------------------------- 2483 * | ACL Allows | Permit | Permit | Permit | 2484 * | DELETE_CHILD | | 2485 * ------------------------------------------------------- 2486 * | ACL Denies | Permit | Deny | Deny | 2487 * | DELETE_CHILD | | | | 2488 * ------------------------------------------------------- 2489 * | ACL specifies | | | | 2490 * | only allow | Permit | Permit | Permit | 2491 * | write and | | | | 2492 * | execute | | | | 2493 * ------------------------------------------------------- 2494 * | ACL denies | | | | 2495 * | write and | Permit | Deny | Deny | 2496 * | execute | | | | 2497 * ------------------------------------------------------- 2498 * ^ 2499 * | 2500 * No search privilege, can't even look up file? 2501 * 2502 */ 2503 int 2504 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr) 2505 { 2506 uint32_t dzp_working_mode = 0; 2507 uint32_t zp_working_mode = 0; 2508 int dzp_error, zp_error; 2509 mode_t missing_perms; 2510 boolean_t dzpcheck_privs = B_TRUE; 2511 boolean_t zpcheck_privs = B_TRUE; 2512 2513 /* 2514 * We want specific DELETE permissions to 2515 * take precedence over WRITE/EXECUTE. We don't 2516 * want an ACL such as this to mess us up. 2517 * user:joe:write_data:deny,user:joe:delete:allow 2518 * 2519 * However, deny permissions may ultimately be overridden 2520 * by secpolicy_vnode_access(). 2521 * 2522 * We will ask for all of the necessary permissions and then 2523 * look at the working modes from the directory and target object 2524 * to determine what was found. 2525 */ 2526 2527 if (zp->z_phys->zp_flags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2528 return (EPERM); 2529 2530 /* 2531 * First row 2532 * If the directory permissions allow the delete, we are done. 2533 */ 2534 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD, 2535 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2536 return (0); 2537 2538 /* 2539 * If target object has delete permission then we are done 2540 */ 2541 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2542 &zpcheck_privs, B_FALSE, cr)) == 0) 2543 return (0); 2544 2545 ASSERT(dzp_error && zp_error); 2546 2547 if (!dzpcheck_privs) 2548 return (dzp_error); 2549 if (!zpcheck_privs) 2550 return (zp_error); 2551 2552 /* 2553 * Second row 2554 * 2555 * If directory returns EACCES then delete_child was denied 2556 * due to deny delete_child. In this case send the request through 2557 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check() 2558 * since that *could* allow the delete based on write/execute permission 2559 * and we want delete permissions to override write/execute. 2560 */ 2561 2562 if (dzp_error == EACCES) 2563 return (secpolicy_vnode_remove(cr)); 2564 2565 /* 2566 * Third Row 2567 * only need to see if we have write/execute on directory. 2568 */ 2569 2570 if ((dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA, 2571 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2572 return (zfs_sticky_remove_access(dzp, zp, cr)); 2573 2574 if (!dzpcheck_privs) 2575 return (dzp_error); 2576 2577 /* 2578 * Fourth row 2579 */ 2580 2581 missing_perms = (dzp_working_mode & ACE_WRITE_DATA) ? VWRITE : 0; 2582 missing_perms |= (dzp_working_mode & ACE_EXECUTE) ? VEXEC : 0; 2583 2584 ASSERT(missing_perms); 2585 2586 return (zfs_delete_final_check(zp, dzp, missing_perms, cr)); 2587 2588 } 2589 2590 int 2591 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2592 znode_t *tzp, cred_t *cr) 2593 { 2594 int add_perm; 2595 int error; 2596 2597 if (szp->z_phys->zp_flags & ZFS_AV_QUARANTINED) 2598 return (EACCES); 2599 2600 add_perm = (ZTOV(szp)->v_type == VDIR) ? 2601 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 2602 2603 /* 2604 * Rename permissions are combination of delete permission + 2605 * add file/subdir permission. 2606 */ 2607 2608 /* 2609 * first make sure we do the delete portion. 2610 * 2611 * If that succeeds then check for add_file/add_subdir permissions 2612 */ 2613 2614 if (error = zfs_zaccess_delete(sdzp, szp, cr)) 2615 return (error); 2616 2617 /* 2618 * If we have a tzp, see if we can delete it? 2619 */ 2620 if (tzp) { 2621 if (error = zfs_zaccess_delete(tdzp, tzp, cr)) 2622 return (error); 2623 } 2624 2625 /* 2626 * Now check for add permissions 2627 */ 2628 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr); 2629 2630 return (error); 2631 } 2632