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 #include <sys/types.h> 27 #include <sys/param.h> 28 #include <sys/time.h> 29 #include <sys/systm.h> 30 #include <sys/sysmacros.h> 31 #include <sys/resource.h> 32 #include <sys/vfs.h> 33 #include <sys/vnode.h> 34 #include <sys/sid.h> 35 #include <sys/file.h> 36 #include <sys/stat.h> 37 #include <sys/kmem.h> 38 #include <sys/cmn_err.h> 39 #include <sys/errno.h> 40 #include <sys/unistd.h> 41 #include <sys/sdt.h> 42 #include <sys/fs/zfs.h> 43 #include <sys/mode.h> 44 #include <sys/policy.h> 45 #include <sys/zfs_znode.h> 46 #include <sys/zfs_fuid.h> 47 #include <sys/zfs_acl.h> 48 #include <sys/zfs_dir.h> 49 #include <sys/zfs_vfsops.h> 50 #include <sys/dmu.h> 51 #include <sys/dnode.h> 52 #include <sys/zap.h> 53 #include "fs/fs_subr.h" 54 #include <acl/acl_common.h> 55 56 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE 57 #define DENY ACE_ACCESS_DENIED_ACE_TYPE 58 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 59 #define MIN_ACE_TYPE ALLOW 60 61 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP) 62 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \ 63 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE) 64 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \ 65 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 66 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \ 67 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 68 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS) 69 70 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \ 71 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \ 72 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \ 73 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE) 74 75 #define WRITE_MASK (WRITE_MASK_DATA|ACE_WRITE_ATTRIBUTES|ACE_WRITE_ACL|\ 76 ACE_WRITE_OWNER|ACE_DELETE|ACE_DELETE_CHILD) 77 78 #define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 79 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 80 81 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 82 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 83 84 #define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \ 85 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE) 86 87 #define RESTRICTED_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER) 88 89 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\ 90 ZFS_ACL_PROTECTED) 91 92 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\ 93 ZFS_ACL_OBJ_ACE) 94 95 static uint16_t 96 zfs_ace_v0_get_type(void *acep) 97 { 98 return (((zfs_oldace_t *)acep)->z_type); 99 } 100 101 static uint16_t 102 zfs_ace_v0_get_flags(void *acep) 103 { 104 return (((zfs_oldace_t *)acep)->z_flags); 105 } 106 107 static uint32_t 108 zfs_ace_v0_get_mask(void *acep) 109 { 110 return (((zfs_oldace_t *)acep)->z_access_mask); 111 } 112 113 static uint64_t 114 zfs_ace_v0_get_who(void *acep) 115 { 116 return (((zfs_oldace_t *)acep)->z_fuid); 117 } 118 119 static void 120 zfs_ace_v0_set_type(void *acep, uint16_t type) 121 { 122 ((zfs_oldace_t *)acep)->z_type = type; 123 } 124 125 static void 126 zfs_ace_v0_set_flags(void *acep, uint16_t flags) 127 { 128 ((zfs_oldace_t *)acep)->z_flags = flags; 129 } 130 131 static void 132 zfs_ace_v0_set_mask(void *acep, uint32_t mask) 133 { 134 ((zfs_oldace_t *)acep)->z_access_mask = mask; 135 } 136 137 static void 138 zfs_ace_v0_set_who(void *acep, uint64_t who) 139 { 140 ((zfs_oldace_t *)acep)->z_fuid = who; 141 } 142 143 /*ARGSUSED*/ 144 static size_t 145 zfs_ace_v0_size(void *acep) 146 { 147 return (sizeof (zfs_oldace_t)); 148 } 149 150 static size_t 151 zfs_ace_v0_abstract_size(void) 152 { 153 return (sizeof (zfs_oldace_t)); 154 } 155 156 static int 157 zfs_ace_v0_mask_off(void) 158 { 159 return (offsetof(zfs_oldace_t, z_access_mask)); 160 } 161 162 /*ARGSUSED*/ 163 static int 164 zfs_ace_v0_data(void *acep, void **datap) 165 { 166 *datap = NULL; 167 return (0); 168 } 169 170 static acl_ops_t zfs_acl_v0_ops = { 171 zfs_ace_v0_get_mask, 172 zfs_ace_v0_set_mask, 173 zfs_ace_v0_get_flags, 174 zfs_ace_v0_set_flags, 175 zfs_ace_v0_get_type, 176 zfs_ace_v0_set_type, 177 zfs_ace_v0_get_who, 178 zfs_ace_v0_set_who, 179 zfs_ace_v0_size, 180 zfs_ace_v0_abstract_size, 181 zfs_ace_v0_mask_off, 182 zfs_ace_v0_data 183 }; 184 185 static uint16_t 186 zfs_ace_fuid_get_type(void *acep) 187 { 188 return (((zfs_ace_hdr_t *)acep)->z_type); 189 } 190 191 static uint16_t 192 zfs_ace_fuid_get_flags(void *acep) 193 { 194 return (((zfs_ace_hdr_t *)acep)->z_flags); 195 } 196 197 static uint32_t 198 zfs_ace_fuid_get_mask(void *acep) 199 { 200 return (((zfs_ace_hdr_t *)acep)->z_access_mask); 201 } 202 203 static uint64_t 204 zfs_ace_fuid_get_who(void *args) 205 { 206 uint16_t entry_type; 207 zfs_ace_t *acep = args; 208 209 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 210 211 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 212 entry_type == ACE_EVERYONE) 213 return (-1); 214 return (((zfs_ace_t *)acep)->z_fuid); 215 } 216 217 static void 218 zfs_ace_fuid_set_type(void *acep, uint16_t type) 219 { 220 ((zfs_ace_hdr_t *)acep)->z_type = type; 221 } 222 223 static void 224 zfs_ace_fuid_set_flags(void *acep, uint16_t flags) 225 { 226 ((zfs_ace_hdr_t *)acep)->z_flags = flags; 227 } 228 229 static void 230 zfs_ace_fuid_set_mask(void *acep, uint32_t mask) 231 { 232 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask; 233 } 234 235 static void 236 zfs_ace_fuid_set_who(void *arg, uint64_t who) 237 { 238 zfs_ace_t *acep = arg; 239 240 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 241 242 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 243 entry_type == ACE_EVERYONE) 244 return; 245 acep->z_fuid = who; 246 } 247 248 static size_t 249 zfs_ace_fuid_size(void *acep) 250 { 251 zfs_ace_hdr_t *zacep = acep; 252 uint16_t entry_type; 253 254 switch (zacep->z_type) { 255 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 256 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 257 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 258 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 259 return (sizeof (zfs_object_ace_t)); 260 case ALLOW: 261 case DENY: 262 entry_type = 263 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS); 264 if (entry_type == ACE_OWNER || 265 entry_type == OWNING_GROUP || 266 entry_type == ACE_EVERYONE) 267 return (sizeof (zfs_ace_hdr_t)); 268 /*FALLTHROUGH*/ 269 default: 270 return (sizeof (zfs_ace_t)); 271 } 272 } 273 274 static size_t 275 zfs_ace_fuid_abstract_size(void) 276 { 277 return (sizeof (zfs_ace_hdr_t)); 278 } 279 280 static int 281 zfs_ace_fuid_mask_off(void) 282 { 283 return (offsetof(zfs_ace_hdr_t, z_access_mask)); 284 } 285 286 static int 287 zfs_ace_fuid_data(void *acep, void **datap) 288 { 289 zfs_ace_t *zacep = acep; 290 zfs_object_ace_t *zobjp; 291 292 switch (zacep->z_hdr.z_type) { 293 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 294 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 295 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 296 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 297 zobjp = acep; 298 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t); 299 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t)); 300 default: 301 *datap = NULL; 302 return (0); 303 } 304 } 305 306 static acl_ops_t zfs_acl_fuid_ops = { 307 zfs_ace_fuid_get_mask, 308 zfs_ace_fuid_set_mask, 309 zfs_ace_fuid_get_flags, 310 zfs_ace_fuid_set_flags, 311 zfs_ace_fuid_get_type, 312 zfs_ace_fuid_set_type, 313 zfs_ace_fuid_get_who, 314 zfs_ace_fuid_set_who, 315 zfs_ace_fuid_size, 316 zfs_ace_fuid_abstract_size, 317 zfs_ace_fuid_mask_off, 318 zfs_ace_fuid_data 319 }; 320 321 static int 322 zfs_acl_version(int version) 323 { 324 if (version < ZPL_VERSION_FUID) 325 return (ZFS_ACL_VERSION_INITIAL); 326 else 327 return (ZFS_ACL_VERSION_FUID); 328 } 329 330 static int 331 zfs_acl_version_zp(znode_t *zp) 332 { 333 return (zfs_acl_version(zp->z_zfsvfs->z_version)); 334 } 335 336 static zfs_acl_t * 337 zfs_acl_alloc(int vers) 338 { 339 zfs_acl_t *aclp; 340 341 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP); 342 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t), 343 offsetof(zfs_acl_node_t, z_next)); 344 aclp->z_version = vers; 345 if (vers == ZFS_ACL_VERSION_FUID) 346 aclp->z_ops = zfs_acl_fuid_ops; 347 else 348 aclp->z_ops = zfs_acl_v0_ops; 349 return (aclp); 350 } 351 352 static zfs_acl_node_t * 353 zfs_acl_node_alloc(size_t bytes) 354 { 355 zfs_acl_node_t *aclnode; 356 357 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP); 358 if (bytes) { 359 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP); 360 aclnode->z_allocdata = aclnode->z_acldata; 361 aclnode->z_allocsize = bytes; 362 aclnode->z_size = bytes; 363 } 364 365 return (aclnode); 366 } 367 368 static void 369 zfs_acl_node_free(zfs_acl_node_t *aclnode) 370 { 371 if (aclnode->z_allocsize) 372 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize); 373 kmem_free(aclnode, sizeof (zfs_acl_node_t)); 374 } 375 376 static void 377 zfs_acl_release_nodes(zfs_acl_t *aclp) 378 { 379 zfs_acl_node_t *aclnode; 380 381 while (aclnode = list_head(&aclp->z_acl)) { 382 list_remove(&aclp->z_acl, aclnode); 383 zfs_acl_node_free(aclnode); 384 } 385 aclp->z_acl_count = 0; 386 aclp->z_acl_bytes = 0; 387 } 388 389 void 390 zfs_acl_free(zfs_acl_t *aclp) 391 { 392 zfs_acl_release_nodes(aclp); 393 list_destroy(&aclp->z_acl); 394 kmem_free(aclp, sizeof (zfs_acl_t)); 395 } 396 397 static boolean_t 398 zfs_acl_valid_ace_type(uint_t type, uint_t flags) 399 { 400 uint16_t entry_type; 401 402 switch (type) { 403 case ALLOW: 404 case DENY: 405 case ACE_SYSTEM_AUDIT_ACE_TYPE: 406 case ACE_SYSTEM_ALARM_ACE_TYPE: 407 entry_type = flags & ACE_TYPE_FLAGS; 408 return (entry_type == ACE_OWNER || 409 entry_type == OWNING_GROUP || 410 entry_type == ACE_EVERYONE || entry_type == 0 || 411 entry_type == ACE_IDENTIFIER_GROUP); 412 default: 413 if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE) 414 return (B_TRUE); 415 } 416 return (B_FALSE); 417 } 418 419 static boolean_t 420 zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags) 421 { 422 /* 423 * first check type of entry 424 */ 425 426 if (!zfs_acl_valid_ace_type(type, iflags)) 427 return (B_FALSE); 428 429 switch (type) { 430 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 431 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 432 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 433 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 434 if (aclp->z_version < ZFS_ACL_VERSION_FUID) 435 return (B_FALSE); 436 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 437 } 438 439 /* 440 * next check inheritance level flags 441 */ 442 443 if (obj_type == VDIR && 444 (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 size_t ace_size; 492 493 /* 494 * Make sure we don't overstep our bounds 495 */ 496 ace_size = aclp->z_ops.ace_size(acep); 497 498 if (((caddr_t)acep + ace_size) > 499 ((caddr_t)aclnode->z_acldata + aclnode->z_size)) { 500 return (NULL); 501 } 502 503 *iflags = aclp->z_ops.ace_flags_get(acep); 504 *type = aclp->z_ops.ace_type_get(acep); 505 *access_mask = aclp->z_ops.ace_mask_get(acep); 506 *who = aclp->z_ops.ace_who_get(acep); 507 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size; 508 aclnode->z_ace_idx++; 509 return ((void *)acep); 510 } 511 return (NULL); 512 } 513 514 /*ARGSUSED*/ 515 static uint64_t 516 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt, 517 uint16_t *flags, uint16_t *type, uint32_t *mask) 518 { 519 zfs_acl_t *aclp = datap; 520 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie; 521 uint64_t who; 522 523 acep = zfs_acl_next_ace(aclp, acep, &who, mask, 524 flags, type); 525 return ((uint64_t)(uintptr_t)acep); 526 } 527 528 static zfs_acl_node_t * 529 zfs_acl_curr_node(zfs_acl_t *aclp) 530 { 531 ASSERT(aclp->z_curr_node); 532 return (aclp->z_curr_node); 533 } 534 535 /* 536 * Copy ACE to internal ZFS format. 537 * While processing the ACL each ACE will be validated for correctness. 538 * ACE FUIDs will be created later. 539 */ 540 int 541 zfs_copy_ace_2_fuid(vtype_t obj_type, zfs_acl_t *aclp, void *datap, 542 zfs_ace_t *z_acl, int aclcnt, size_t *size) 543 { 544 int i; 545 uint16_t entry_type; 546 zfs_ace_t *aceptr = z_acl; 547 ace_t *acep = datap; 548 zfs_object_ace_t *zobjacep; 549 ace_object_t *aceobjp; 550 551 for (i = 0; i != aclcnt; i++) { 552 aceptr->z_hdr.z_access_mask = acep->a_access_mask; 553 aceptr->z_hdr.z_flags = acep->a_flags; 554 aceptr->z_hdr.z_type = acep->a_type; 555 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS; 556 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP && 557 entry_type != ACE_EVERYONE) { 558 if (!aclp->z_has_fuids) 559 aclp->z_has_fuids = IS_EPHEMERAL(acep->a_who); 560 aceptr->z_fuid = (uint64_t)acep->a_who; 561 } 562 563 /* 564 * Make sure ACE is valid 565 */ 566 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type, 567 aceptr->z_hdr.z_flags) != B_TRUE) 568 return (EINVAL); 569 570 switch (acep->a_type) { 571 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 572 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 573 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 574 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 575 zobjacep = (zfs_object_ace_t *)aceptr; 576 aceobjp = (ace_object_t *)acep; 577 578 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type, 579 sizeof (aceobjp->a_obj_type)); 580 bcopy(aceobjp->a_inherit_obj_type, 581 zobjacep->z_inherit_type, 582 sizeof (aceobjp->a_inherit_obj_type)); 583 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t)); 584 break; 585 default: 586 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t)); 587 } 588 589 aceptr = (zfs_ace_t *)((caddr_t)aceptr + 590 aclp->z_ops.ace_size(aceptr)); 591 } 592 593 *size = (caddr_t)aceptr - (caddr_t)z_acl; 594 595 return (0); 596 } 597 598 /* 599 * Copy ZFS ACEs to fixed size ace_t layout 600 */ 601 static void 602 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr, 603 void *datap, int filter) 604 { 605 uint64_t who; 606 uint32_t access_mask; 607 uint16_t iflags, type; 608 zfs_ace_hdr_t *zacep = NULL; 609 ace_t *acep = datap; 610 ace_object_t *objacep; 611 zfs_object_ace_t *zobjacep; 612 size_t ace_size; 613 uint16_t entry_type; 614 615 while (zacep = zfs_acl_next_ace(aclp, zacep, 616 &who, &access_mask, &iflags, &type)) { 617 618 switch (type) { 619 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 620 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 621 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 622 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 623 if (filter) { 624 continue; 625 } 626 zobjacep = (zfs_object_ace_t *)zacep; 627 objacep = (ace_object_t *)acep; 628 bcopy(zobjacep->z_object_type, 629 objacep->a_obj_type, 630 sizeof (zobjacep->z_object_type)); 631 bcopy(zobjacep->z_inherit_type, 632 objacep->a_inherit_obj_type, 633 sizeof (zobjacep->z_inherit_type)); 634 ace_size = sizeof (ace_object_t); 635 break; 636 default: 637 ace_size = sizeof (ace_t); 638 break; 639 } 640 641 entry_type = (iflags & ACE_TYPE_FLAGS); 642 if ((entry_type != ACE_OWNER && 643 entry_type != OWNING_GROUP && 644 entry_type != ACE_EVERYONE)) { 645 acep->a_who = zfs_fuid_map_id(zfsvfs, who, 646 cr, (entry_type & ACE_IDENTIFIER_GROUP) ? 647 ZFS_ACE_GROUP : ZFS_ACE_USER); 648 } else { 649 acep->a_who = (uid_t)(int64_t)who; 650 } 651 acep->a_access_mask = access_mask; 652 acep->a_flags = iflags; 653 acep->a_type = type; 654 acep = (ace_t *)((caddr_t)acep + ace_size); 655 } 656 } 657 658 static int 659 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep, 660 zfs_oldace_t *z_acl, int aclcnt, size_t *size) 661 { 662 int i; 663 zfs_oldace_t *aceptr = z_acl; 664 665 for (i = 0; i != aclcnt; i++, aceptr++) { 666 aceptr->z_access_mask = acep[i].a_access_mask; 667 aceptr->z_type = acep[i].a_type; 668 aceptr->z_flags = acep[i].a_flags; 669 aceptr->z_fuid = acep[i].a_who; 670 /* 671 * Make sure ACE is valid 672 */ 673 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type, 674 aceptr->z_flags) != B_TRUE) 675 return (EINVAL); 676 } 677 *size = (caddr_t)aceptr - (caddr_t)z_acl; 678 return (0); 679 } 680 681 /* 682 * convert old ACL format to new 683 */ 684 void 685 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp) 686 { 687 zfs_oldace_t *oldaclp; 688 int i; 689 uint16_t type, iflags; 690 uint32_t access_mask; 691 uint64_t who; 692 void *cookie = NULL; 693 zfs_acl_node_t *newaclnode; 694 695 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL); 696 /* 697 * First create the ACE in a contiguous piece of memory 698 * for zfs_copy_ace_2_fuid(). 699 * 700 * We only convert an ACL once, so this won't happen 701 * everytime. 702 */ 703 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count, 704 KM_SLEEP); 705 i = 0; 706 while (cookie = zfs_acl_next_ace(aclp, cookie, &who, 707 &access_mask, &iflags, &type)) { 708 oldaclp[i].z_flags = iflags; 709 oldaclp[i].z_type = type; 710 oldaclp[i].z_fuid = who; 711 oldaclp[i++].z_access_mask = access_mask; 712 } 713 714 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count * 715 sizeof (zfs_object_ace_t)); 716 aclp->z_ops = zfs_acl_fuid_ops; 717 VERIFY(zfs_copy_ace_2_fuid(ZTOV(zp)->v_type, aclp, oldaclp, 718 newaclnode->z_acldata, aclp->z_acl_count, 719 &newaclnode->z_size) == 0); 720 newaclnode->z_ace_count = aclp->z_acl_count; 721 aclp->z_version = ZFS_ACL_VERSION; 722 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t)); 723 724 /* 725 * Release all previous ACL nodes 726 */ 727 728 zfs_acl_release_nodes(aclp); 729 730 list_insert_head(&aclp->z_acl, newaclnode); 731 732 aclp->z_acl_bytes = newaclnode->z_size; 733 aclp->z_acl_count = newaclnode->z_ace_count; 734 735 } 736 737 /* 738 * Convert unix access mask to v4 access mask 739 */ 740 static uint32_t 741 zfs_unix_to_v4(uint32_t access_mask) 742 { 743 uint32_t new_mask = 0; 744 745 if (access_mask & S_IXOTH) 746 new_mask |= ACE_EXECUTE; 747 if (access_mask & S_IWOTH) 748 new_mask |= ACE_WRITE_DATA; 749 if (access_mask & S_IROTH) 750 new_mask |= ACE_READ_DATA; 751 return (new_mask); 752 } 753 754 static void 755 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask, 756 uint16_t access_type, uint64_t fuid, uint16_t entry_type) 757 { 758 uint16_t type = entry_type & ACE_TYPE_FLAGS; 759 760 aclp->z_ops.ace_mask_set(acep, access_mask); 761 aclp->z_ops.ace_type_set(acep, access_type); 762 aclp->z_ops.ace_flags_set(acep, entry_type); 763 if ((type != ACE_OWNER && type != OWNING_GROUP && 764 type != ACE_EVERYONE)) 765 aclp->z_ops.ace_who_set(acep, fuid); 766 } 767 768 /* 769 * Determine mode of file based on ACL. 770 * Also, create FUIDs for any User/Group ACEs 771 */ 772 static uint64_t 773 zfs_mode_fuid_compute(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, 774 zfs_fuid_info_t **fuidp, dmu_tx_t *tx) 775 { 776 int entry_type; 777 mode_t mode; 778 mode_t seen = 0; 779 zfs_ace_hdr_t *acep = NULL; 780 uint64_t who; 781 uint16_t iflags, type; 782 uint32_t access_mask; 783 784 mode = (zp->z_phys->zp_mode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX)); 785 786 while (acep = zfs_acl_next_ace(aclp, acep, &who, 787 &access_mask, &iflags, &type)) { 788 789 if (!zfs_acl_valid_ace_type(type, iflags)) 790 continue; 791 792 entry_type = (iflags & ACE_TYPE_FLAGS); 793 794 /* 795 * Skip over owner@, group@ or everyone@ inherit only ACEs 796 */ 797 if ((iflags & ACE_INHERIT_ONLY_ACE) && 798 (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE || 799 entry_type == OWNING_GROUP)) 800 continue; 801 802 if (entry_type == ACE_OWNER) { 803 if ((access_mask & ACE_READ_DATA) && 804 (!(seen & S_IRUSR))) { 805 seen |= S_IRUSR; 806 if (type == ALLOW) { 807 mode |= S_IRUSR; 808 } 809 } 810 if ((access_mask & ACE_WRITE_DATA) && 811 (!(seen & S_IWUSR))) { 812 seen |= S_IWUSR; 813 if (type == ALLOW) { 814 mode |= S_IWUSR; 815 } 816 } 817 if ((access_mask & ACE_EXECUTE) && 818 (!(seen & S_IXUSR))) { 819 seen |= S_IXUSR; 820 if (type == ALLOW) { 821 mode |= S_IXUSR; 822 } 823 } 824 } else if (entry_type == OWNING_GROUP) { 825 if ((access_mask & ACE_READ_DATA) && 826 (!(seen & S_IRGRP))) { 827 seen |= S_IRGRP; 828 if (type == ALLOW) { 829 mode |= S_IRGRP; 830 } 831 } 832 if ((access_mask & ACE_WRITE_DATA) && 833 (!(seen & S_IWGRP))) { 834 seen |= S_IWGRP; 835 if (type == ALLOW) { 836 mode |= S_IWGRP; 837 } 838 } 839 if ((access_mask & ACE_EXECUTE) && 840 (!(seen & S_IXGRP))) { 841 seen |= S_IXGRP; 842 if (type == ALLOW) { 843 mode |= S_IXGRP; 844 } 845 } 846 } else if (entry_type == ACE_EVERYONE) { 847 if ((access_mask & ACE_READ_DATA)) { 848 if (!(seen & S_IRUSR)) { 849 seen |= S_IRUSR; 850 if (type == ALLOW) { 851 mode |= S_IRUSR; 852 } 853 } 854 if (!(seen & S_IRGRP)) { 855 seen |= S_IRGRP; 856 if (type == ALLOW) { 857 mode |= S_IRGRP; 858 } 859 } 860 if (!(seen & S_IROTH)) { 861 seen |= S_IROTH; 862 if (type == ALLOW) { 863 mode |= S_IROTH; 864 } 865 } 866 } 867 if ((access_mask & ACE_WRITE_DATA)) { 868 if (!(seen & S_IWUSR)) { 869 seen |= S_IWUSR; 870 if (type == ALLOW) { 871 mode |= S_IWUSR; 872 } 873 } 874 if (!(seen & S_IWGRP)) { 875 seen |= S_IWGRP; 876 if (type == ALLOW) { 877 mode |= S_IWGRP; 878 } 879 } 880 if (!(seen & S_IWOTH)) { 881 seen |= S_IWOTH; 882 if (type == ALLOW) { 883 mode |= S_IWOTH; 884 } 885 } 886 } 887 if ((access_mask & ACE_EXECUTE)) { 888 if (!(seen & S_IXUSR)) { 889 seen |= S_IXUSR; 890 if (type == ALLOW) { 891 mode |= S_IXUSR; 892 } 893 } 894 if (!(seen & S_IXGRP)) { 895 seen |= S_IXGRP; 896 if (type == ALLOW) { 897 mode |= S_IXGRP; 898 } 899 } 900 if (!(seen & S_IXOTH)) { 901 seen |= S_IXOTH; 902 if (type == ALLOW) { 903 mode |= S_IXOTH; 904 } 905 } 906 } 907 } 908 /* 909 * Now handle FUID create for user/group ACEs 910 */ 911 if (entry_type == 0 || entry_type == ACE_IDENTIFIER_GROUP) { 912 aclp->z_ops.ace_who_set(acep, 913 zfs_fuid_create(zp->z_zfsvfs, who, cr, 914 (entry_type == 0) ? ZFS_ACE_USER : ZFS_ACE_GROUP, 915 tx, fuidp)); 916 } 917 } 918 return (mode); 919 } 920 921 static zfs_acl_t * 922 zfs_acl_node_read_internal(znode_t *zp, boolean_t will_modify) 923 { 924 zfs_acl_t *aclp; 925 zfs_acl_node_t *aclnode; 926 927 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 928 929 /* 930 * Version 0 to 1 znode_acl_phys has the size/count fields swapped. 931 * Version 0 didn't have a size field, only a count. 932 */ 933 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 934 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_size; 935 aclp->z_acl_bytes = ZFS_ACL_SIZE(aclp->z_acl_count); 936 } else { 937 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count; 938 aclp->z_acl_bytes = zp->z_phys->zp_acl.z_acl_size; 939 } 940 941 aclnode = zfs_acl_node_alloc(will_modify ? aclp->z_acl_bytes : 0); 942 aclnode->z_ace_count = aclp->z_acl_count; 943 if (will_modify) { 944 bcopy(zp->z_phys->zp_acl.z_ace_data, aclnode->z_acldata, 945 aclp->z_acl_bytes); 946 } else { 947 aclnode->z_size = aclp->z_acl_bytes; 948 aclnode->z_acldata = &zp->z_phys->zp_acl.z_ace_data[0]; 949 } 950 951 list_insert_head(&aclp->z_acl, aclnode); 952 953 return (aclp); 954 } 955 956 /* 957 * Read an external acl object. 958 */ 959 static int 960 zfs_acl_node_read(znode_t *zp, zfs_acl_t **aclpp, boolean_t will_modify) 961 { 962 uint64_t extacl = zp->z_phys->zp_acl.z_acl_extern_obj; 963 zfs_acl_t *aclp; 964 size_t aclsize; 965 size_t acl_count; 966 zfs_acl_node_t *aclnode; 967 int error; 968 969 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 970 971 if (zp->z_phys->zp_acl.z_acl_extern_obj == 0) { 972 *aclpp = zfs_acl_node_read_internal(zp, will_modify); 973 return (0); 974 } 975 976 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 977 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 978 zfs_acl_phys_v0_t *zacl0 = 979 (zfs_acl_phys_v0_t *)&zp->z_phys->zp_acl; 980 981 aclsize = ZFS_ACL_SIZE(zacl0->z_acl_count); 982 acl_count = zacl0->z_acl_count; 983 } else { 984 aclsize = zp->z_phys->zp_acl.z_acl_size; 985 acl_count = zp->z_phys->zp_acl.z_acl_count; 986 if (aclsize == 0) 987 aclsize = acl_count * sizeof (zfs_ace_t); 988 } 989 aclnode = zfs_acl_node_alloc(aclsize); 990 list_insert_head(&aclp->z_acl, aclnode); 991 error = dmu_read(zp->z_zfsvfs->z_os, extacl, 0, 992 aclsize, aclnode->z_acldata); 993 aclnode->z_ace_count = acl_count; 994 aclp->z_acl_count = acl_count; 995 aclp->z_acl_bytes = aclsize; 996 997 if (error != 0) { 998 zfs_acl_free(aclp); 999 /* convert checksum errors into IO errors */ 1000 if (error == ECKSUM) 1001 error = EIO; 1002 return (error); 1003 } 1004 1005 *aclpp = aclp; 1006 return (0); 1007 } 1008 1009 /* 1010 * common code for setting ACLs. 1011 * 1012 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl. 1013 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's 1014 * already checked the acl and knows whether to inherit. 1015 */ 1016 int 1017 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, 1018 zfs_fuid_info_t **fuidp, dmu_tx_t *tx) 1019 { 1020 int error; 1021 znode_phys_t *zphys = zp->z_phys; 1022 zfs_acl_phys_t *zacl = &zphys->zp_acl; 1023 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1024 uint64_t aoid = zphys->zp_acl.z_acl_extern_obj; 1025 uint64_t off = 0; 1026 dmu_object_type_t otype; 1027 zfs_acl_node_t *aclnode; 1028 1029 ASSERT(MUTEX_HELD(&zp->z_lock)); 1030 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1031 1032 dmu_buf_will_dirty(zp->z_dbuf, tx); 1033 1034 zphys->zp_mode = zfs_mode_fuid_compute(zp, aclp, cr, fuidp, tx); 1035 1036 /* 1037 * Decide which opbject type to use. If we are forced to 1038 * use old ACL format than transform ACL into zfs_oldace_t 1039 * layout. 1040 */ 1041 if (!zfsvfs->z_use_fuids) { 1042 otype = DMU_OT_OLDACL; 1043 } else { 1044 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) && 1045 (zfsvfs->z_version >= ZPL_VERSION_FUID)) 1046 zfs_acl_xform(zp, aclp); 1047 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID); 1048 otype = DMU_OT_ACL; 1049 } 1050 1051 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1052 /* 1053 * If ACL was previously external and we are now 1054 * converting to new ACL format then release old 1055 * ACL object and create a new one. 1056 */ 1057 if (aoid && aclp->z_version != zacl->z_acl_version) { 1058 error = dmu_object_free(zfsvfs->z_os, 1059 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1060 if (error) 1061 return (error); 1062 aoid = 0; 1063 } 1064 if (aoid == 0) { 1065 aoid = dmu_object_alloc(zfsvfs->z_os, 1066 otype, aclp->z_acl_bytes, 1067 otype == DMU_OT_ACL ? DMU_OT_SYSACL : DMU_OT_NONE, 1068 otype == DMU_OT_ACL ? DN_MAX_BONUSLEN : 0, tx); 1069 } else { 1070 (void) dmu_object_set_blocksize(zfsvfs->z_os, aoid, 1071 aclp->z_acl_bytes, 0, tx); 1072 } 1073 zphys->zp_acl.z_acl_extern_obj = aoid; 1074 for (aclnode = list_head(&aclp->z_acl); aclnode; 1075 aclnode = list_next(&aclp->z_acl, aclnode)) { 1076 if (aclnode->z_ace_count == 0) 1077 continue; 1078 dmu_write(zfsvfs->z_os, aoid, off, 1079 aclnode->z_size, aclnode->z_acldata, tx); 1080 off += aclnode->z_size; 1081 } 1082 } else { 1083 void *start = zacl->z_ace_data; 1084 /* 1085 * Migrating back embedded? 1086 */ 1087 if (zphys->zp_acl.z_acl_extern_obj) { 1088 error = dmu_object_free(zfsvfs->z_os, 1089 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1090 if (error) 1091 return (error); 1092 zphys->zp_acl.z_acl_extern_obj = 0; 1093 } 1094 1095 for (aclnode = list_head(&aclp->z_acl); aclnode; 1096 aclnode = list_next(&aclp->z_acl, aclnode)) { 1097 if (aclnode->z_ace_count == 0) 1098 continue; 1099 bcopy(aclnode->z_acldata, start, aclnode->z_size); 1100 start = (caddr_t)start + aclnode->z_size; 1101 } 1102 } 1103 1104 /* 1105 * If Old version then swap count/bytes to match old 1106 * layout of znode_acl_phys_t. 1107 */ 1108 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1109 zphys->zp_acl.z_acl_size = aclp->z_acl_count; 1110 zphys->zp_acl.z_acl_count = aclp->z_acl_bytes; 1111 } else { 1112 zphys->zp_acl.z_acl_size = aclp->z_acl_bytes; 1113 zphys->zp_acl.z_acl_count = aclp->z_acl_count; 1114 } 1115 1116 zphys->zp_acl.z_acl_version = aclp->z_version; 1117 1118 /* 1119 * Replace ACL wide bits, but first clear them. 1120 */ 1121 zp->z_phys->zp_flags &= ~ZFS_ACL_WIDE_FLAGS; 1122 1123 zp->z_phys->zp_flags |= aclp->z_hints; 1124 1125 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0) 1126 zp->z_phys->zp_flags |= ZFS_ACL_TRIVIAL; 1127 1128 zfs_time_stamper_locked(zp, STATE_CHANGED, tx); 1129 return (0); 1130 } 1131 1132 /* 1133 * Update access mask for prepended ACE 1134 * 1135 * This applies the "groupmask" value for aclmode property. 1136 */ 1137 static void 1138 zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep, 1139 mode_t mode, uint64_t owner) 1140 { 1141 int rmask, wmask, xmask; 1142 int user_ace; 1143 uint16_t aceflags; 1144 uint32_t origmask, acepmask; 1145 uint64_t fuid; 1146 1147 aceflags = aclp->z_ops.ace_flags_get(acep); 1148 fuid = aclp->z_ops.ace_who_get(acep); 1149 origmask = aclp->z_ops.ace_mask_get(origacep); 1150 acepmask = aclp->z_ops.ace_mask_get(acep); 1151 1152 user_ace = (!(aceflags & 1153 (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP))); 1154 1155 if (user_ace && (fuid == owner)) { 1156 rmask = S_IRUSR; 1157 wmask = S_IWUSR; 1158 xmask = S_IXUSR; 1159 } else { 1160 rmask = S_IRGRP; 1161 wmask = S_IWGRP; 1162 xmask = S_IXGRP; 1163 } 1164 1165 if (origmask & ACE_READ_DATA) { 1166 if (mode & rmask) { 1167 acepmask &= ~ACE_READ_DATA; 1168 } else { 1169 acepmask |= ACE_READ_DATA; 1170 } 1171 } 1172 1173 if (origmask & ACE_WRITE_DATA) { 1174 if (mode & wmask) { 1175 acepmask &= ~ACE_WRITE_DATA; 1176 } else { 1177 acepmask |= ACE_WRITE_DATA; 1178 } 1179 } 1180 1181 if (origmask & ACE_APPEND_DATA) { 1182 if (mode & wmask) { 1183 acepmask &= ~ACE_APPEND_DATA; 1184 } else { 1185 acepmask |= ACE_APPEND_DATA; 1186 } 1187 } 1188 1189 if (origmask & ACE_EXECUTE) { 1190 if (mode & xmask) { 1191 acepmask &= ~ACE_EXECUTE; 1192 } else { 1193 acepmask |= ACE_EXECUTE; 1194 } 1195 } 1196 aclp->z_ops.ace_mask_set(acep, acepmask); 1197 } 1198 1199 /* 1200 * Apply mode to canonical six ACEs. 1201 */ 1202 static void 1203 zfs_acl_fixup_canonical_six(zfs_acl_t *aclp, mode_t mode) 1204 { 1205 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1206 void *acep; 1207 int maskoff = aclp->z_ops.ace_mask_off(); 1208 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1209 1210 ASSERT(aclnode != NULL); 1211 1212 acep = (void *)((caddr_t)aclnode->z_acldata + 1213 aclnode->z_size - (abstract_size * 6)); 1214 1215 /* 1216 * Fixup final ACEs to match the mode 1217 */ 1218 1219 adjust_ace_pair_common(acep, maskoff, abstract_size, 1220 (mode & 0700) >> 6); /* owner@ */ 1221 1222 acep = (caddr_t)acep + (abstract_size * 2); 1223 1224 adjust_ace_pair_common(acep, maskoff, abstract_size, 1225 (mode & 0070) >> 3); /* group@ */ 1226 1227 acep = (caddr_t)acep + (abstract_size * 2); 1228 adjust_ace_pair_common(acep, maskoff, 1229 abstract_size, mode); /* everyone@ */ 1230 } 1231 1232 1233 static int 1234 zfs_acl_ace_match(zfs_acl_t *aclp, void *acep, int allow_deny, 1235 int entry_type, int accessmask) 1236 { 1237 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1238 uint16_t type = aclp->z_ops.ace_type_get(acep); 1239 uint16_t flags = aclp->z_ops.ace_flags_get(acep); 1240 1241 return (mask == accessmask && type == allow_deny && 1242 ((flags & ACE_TYPE_FLAGS) == entry_type)); 1243 } 1244 1245 /* 1246 * Can prepended ACE be reused? 1247 */ 1248 static int 1249 zfs_reuse_deny(zfs_acl_t *aclp, void *acep, void *prevacep) 1250 { 1251 int okay_masks; 1252 uint16_t prevtype; 1253 uint16_t prevflags; 1254 uint16_t flags; 1255 uint32_t mask, prevmask; 1256 1257 if (prevacep == NULL) 1258 return (B_FALSE); 1259 1260 prevtype = aclp->z_ops.ace_type_get(prevacep); 1261 prevflags = aclp->z_ops.ace_flags_get(prevacep); 1262 flags = aclp->z_ops.ace_flags_get(acep); 1263 mask = aclp->z_ops.ace_mask_get(acep); 1264 prevmask = aclp->z_ops.ace_mask_get(prevacep); 1265 1266 if (prevtype != DENY) 1267 return (B_FALSE); 1268 1269 if (prevflags != (flags & ACE_IDENTIFIER_GROUP)) 1270 return (B_FALSE); 1271 1272 okay_masks = (mask & OKAY_MASK_BITS); 1273 1274 if (prevmask & ~okay_masks) 1275 return (B_FALSE); 1276 1277 return (B_TRUE); 1278 } 1279 1280 1281 /* 1282 * Insert new ACL node into chain of zfs_acl_node_t's 1283 * 1284 * This will result in two possible results. 1285 * 1. If the ACL is currently just a single zfs_acl_node and 1286 * we are prepending the entry then current acl node will have 1287 * a new node inserted above it. 1288 * 1289 * 2. If we are inserting in the middle of current acl node then 1290 * the current node will be split in two and new node will be inserted 1291 * in between the two split nodes. 1292 */ 1293 static zfs_acl_node_t * 1294 zfs_acl_ace_insert(zfs_acl_t *aclp, void *acep) 1295 { 1296 zfs_acl_node_t *newnode; 1297 zfs_acl_node_t *trailernode = NULL; 1298 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1299 int curr_idx = aclp->z_curr_node->z_ace_idx; 1300 int trailer_count; 1301 size_t oldsize; 1302 1303 newnode = zfs_acl_node_alloc(aclp->z_ops.ace_size(acep)); 1304 newnode->z_ace_count = 1; 1305 1306 oldsize = currnode->z_size; 1307 1308 if (curr_idx != 1) { 1309 trailernode = zfs_acl_node_alloc(0); 1310 trailernode->z_acldata = acep; 1311 1312 trailer_count = currnode->z_ace_count - curr_idx + 1; 1313 currnode->z_ace_count = curr_idx - 1; 1314 currnode->z_size = (caddr_t)acep - (caddr_t)currnode->z_acldata; 1315 trailernode->z_size = oldsize - currnode->z_size; 1316 trailernode->z_ace_count = trailer_count; 1317 } 1318 1319 aclp->z_acl_count += 1; 1320 aclp->z_acl_bytes += aclp->z_ops.ace_size(acep); 1321 1322 if (curr_idx == 1) 1323 list_insert_before(&aclp->z_acl, currnode, newnode); 1324 else 1325 list_insert_after(&aclp->z_acl, currnode, newnode); 1326 if (trailernode) { 1327 list_insert_after(&aclp->z_acl, newnode, trailernode); 1328 aclp->z_curr_node = trailernode; 1329 trailernode->z_ace_idx = 1; 1330 } 1331 1332 return (newnode); 1333 } 1334 1335 /* 1336 * Prepend deny ACE 1337 */ 1338 static void * 1339 zfs_acl_prepend_deny(znode_t *zp, zfs_acl_t *aclp, void *acep, 1340 mode_t mode) 1341 { 1342 zfs_acl_node_t *aclnode; 1343 void *newacep; 1344 uint64_t fuid; 1345 uint16_t flags; 1346 1347 aclnode = zfs_acl_ace_insert(aclp, acep); 1348 newacep = aclnode->z_acldata; 1349 fuid = aclp->z_ops.ace_who_get(acep); 1350 flags = aclp->z_ops.ace_flags_get(acep); 1351 zfs_set_ace(aclp, newacep, 0, DENY, fuid, (flags & ACE_TYPE_FLAGS)); 1352 zfs_acl_prepend_fixup(aclp, newacep, acep, mode, zp->z_phys->zp_uid); 1353 1354 return (newacep); 1355 } 1356 1357 /* 1358 * Split an inherited ACE into inherit_only ACE 1359 * and original ACE with inheritance flags stripped off. 1360 */ 1361 static void 1362 zfs_acl_split_ace(zfs_acl_t *aclp, zfs_ace_hdr_t *acep) 1363 { 1364 zfs_acl_node_t *aclnode; 1365 zfs_acl_node_t *currnode; 1366 void *newacep; 1367 uint16_t type, flags; 1368 uint32_t mask; 1369 uint64_t fuid; 1370 1371 type = aclp->z_ops.ace_type_get(acep); 1372 flags = aclp->z_ops.ace_flags_get(acep); 1373 mask = aclp->z_ops.ace_mask_get(acep); 1374 fuid = aclp->z_ops.ace_who_get(acep); 1375 1376 aclnode = zfs_acl_ace_insert(aclp, acep); 1377 newacep = aclnode->z_acldata; 1378 1379 aclp->z_ops.ace_type_set(newacep, type); 1380 aclp->z_ops.ace_flags_set(newacep, flags | ACE_INHERIT_ONLY_ACE); 1381 aclp->z_ops.ace_mask_set(newacep, mask); 1382 aclp->z_ops.ace_type_set(newacep, type); 1383 aclp->z_ops.ace_who_set(newacep, fuid); 1384 aclp->z_next_ace = acep; 1385 flags &= ~ALL_INHERIT; 1386 aclp->z_ops.ace_flags_set(acep, flags); 1387 currnode = zfs_acl_curr_node(aclp); 1388 ASSERT(currnode->z_ace_idx >= 1); 1389 currnode->z_ace_idx -= 1; 1390 } 1391 1392 /* 1393 * Are ACES started at index i, the canonical six ACES? 1394 */ 1395 static int 1396 zfs_have_canonical_six(zfs_acl_t *aclp) 1397 { 1398 void *acep; 1399 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1400 int i = 0; 1401 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1402 1403 ASSERT(aclnode != NULL); 1404 1405 if (aclnode->z_ace_count < 6) 1406 return (0); 1407 1408 acep = (void *)((caddr_t)aclnode->z_acldata + 1409 aclnode->z_size - (aclp->z_ops.ace_abstract_size() * 6)); 1410 1411 if ((zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1412 DENY, ACE_OWNER, 0) && 1413 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1414 ALLOW, ACE_OWNER, OWNER_ALLOW_MASK) && 1415 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), DENY, 1416 OWNING_GROUP, 0) && zfs_acl_ace_match(aclp, (caddr_t)acep + 1417 (abstract_size * i++), 1418 ALLOW, OWNING_GROUP, 0) && 1419 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1420 DENY, ACE_EVERYONE, EVERYONE_DENY_MASK) && 1421 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1422 ALLOW, ACE_EVERYONE, EVERYONE_ALLOW_MASK))) { 1423 return (1); 1424 } else { 1425 return (0); 1426 } 1427 } 1428 1429 1430 /* 1431 * Apply step 1g, to group entries 1432 * 1433 * Need to deal with corner case where group may have 1434 * greater permissions than owner. If so then limit 1435 * group permissions, based on what extra permissions 1436 * group has. 1437 */ 1438 static void 1439 zfs_fixup_group_entries(zfs_acl_t *aclp, void *acep, void *prevacep, 1440 mode_t mode) 1441 { 1442 uint32_t prevmask = aclp->z_ops.ace_mask_get(prevacep); 1443 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1444 uint16_t prevflags = aclp->z_ops.ace_flags_get(prevacep); 1445 mode_t extramode = (mode >> 3) & 07; 1446 mode_t ownermode = (mode >> 6); 1447 1448 if (prevflags & ACE_IDENTIFIER_GROUP) { 1449 1450 extramode &= ~ownermode; 1451 1452 if (extramode) { 1453 if (extramode & S_IROTH) { 1454 prevmask &= ~ACE_READ_DATA; 1455 mask &= ~ACE_READ_DATA; 1456 } 1457 if (extramode & S_IWOTH) { 1458 prevmask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1459 mask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1460 } 1461 if (extramode & S_IXOTH) { 1462 prevmask &= ~ACE_EXECUTE; 1463 mask &= ~ACE_EXECUTE; 1464 } 1465 } 1466 } 1467 aclp->z_ops.ace_mask_set(acep, mask); 1468 aclp->z_ops.ace_mask_set(prevacep, prevmask); 1469 } 1470 1471 /* 1472 * Apply the chmod algorithm as described 1473 * in PSARC/2002/240 1474 */ 1475 static void 1476 zfs_acl_chmod(znode_t *zp, uint64_t mode, zfs_acl_t *aclp) 1477 { 1478 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1479 void *acep = NULL, *prevacep = NULL; 1480 uint64_t who; 1481 int i; 1482 int entry_type; 1483 int reuse_deny; 1484 int need_canonical_six = 1; 1485 uint16_t iflags, type; 1486 uint32_t access_mask; 1487 1488 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1489 ASSERT(MUTEX_HELD(&zp->z_lock)); 1490 1491 aclp->z_hints = (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 1492 1493 /* 1494 * If discard then just discard all ACL nodes which 1495 * represent the ACEs. 1496 * 1497 * New owner@/group@/everone@ ACEs will be added 1498 * later. 1499 */ 1500 if (zfsvfs->z_acl_mode == ZFS_ACL_DISCARD) 1501 zfs_acl_release_nodes(aclp); 1502 1503 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 1504 &iflags, &type)) { 1505 1506 entry_type = (iflags & ACE_TYPE_FLAGS); 1507 iflags = (iflags & ALL_INHERIT); 1508 1509 if ((type != ALLOW && type != DENY) || 1510 (iflags & ACE_INHERIT_ONLY_ACE)) { 1511 if (iflags) 1512 aclp->z_hints |= ZFS_INHERIT_ACE; 1513 switch (type) { 1514 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1515 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1516 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1517 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1518 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 1519 break; 1520 } 1521 goto nextace; 1522 } 1523 1524 /* 1525 * Need to split ace into two? 1526 */ 1527 if ((iflags & (ACE_FILE_INHERIT_ACE| 1528 ACE_DIRECTORY_INHERIT_ACE)) && 1529 (!(iflags & ACE_INHERIT_ONLY_ACE))) { 1530 zfs_acl_split_ace(aclp, acep); 1531 aclp->z_hints |= ZFS_INHERIT_ACE; 1532 goto nextace; 1533 } 1534 1535 if (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE || 1536 (entry_type == OWNING_GROUP)) { 1537 access_mask &= ~OGE_CLEAR; 1538 aclp->z_ops.ace_mask_set(acep, access_mask); 1539 goto nextace; 1540 } else { 1541 reuse_deny = B_TRUE; 1542 if (type == ALLOW) { 1543 1544 /* 1545 * Check preceding ACE if any, to see 1546 * if we need to prepend a DENY ACE. 1547 * This is only applicable when the acl_mode 1548 * property == groupmask. 1549 */ 1550 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK) { 1551 1552 reuse_deny = zfs_reuse_deny(aclp, acep, 1553 prevacep); 1554 1555 if (!reuse_deny) { 1556 prevacep = 1557 zfs_acl_prepend_deny(zp, 1558 aclp, acep, mode); 1559 } else { 1560 zfs_acl_prepend_fixup( 1561 aclp, prevacep, 1562 acep, mode, 1563 zp->z_phys->zp_uid); 1564 } 1565 zfs_fixup_group_entries(aclp, acep, 1566 prevacep, mode); 1567 1568 } 1569 } 1570 } 1571 nextace: 1572 prevacep = acep; 1573 } 1574 1575 /* 1576 * Check out last six aces, if we have six. 1577 */ 1578 1579 if (aclp->z_acl_count >= 6) { 1580 if (zfs_have_canonical_six(aclp)) { 1581 need_canonical_six = 0; 1582 } 1583 } 1584 1585 if (need_canonical_six) { 1586 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1587 void *zacep; 1588 zfs_acl_node_t *aclnode = 1589 zfs_acl_node_alloc(abstract_size * 6); 1590 1591 aclnode->z_size = abstract_size * 6; 1592 aclnode->z_ace_count = 6; 1593 aclp->z_acl_bytes += aclnode->z_size; 1594 list_insert_tail(&aclp->z_acl, aclnode); 1595 1596 zacep = aclnode->z_acldata; 1597 1598 i = 0; 1599 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1600 0, DENY, -1, ACE_OWNER); 1601 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1602 OWNER_ALLOW_MASK, ALLOW, -1, ACE_OWNER); 1603 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1604 DENY, -1, OWNING_GROUP); 1605 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1606 ALLOW, -1, OWNING_GROUP); 1607 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1608 EVERYONE_DENY_MASK, DENY, -1, ACE_EVERYONE); 1609 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1610 EVERYONE_ALLOW_MASK, ALLOW, -1, ACE_EVERYONE); 1611 aclp->z_acl_count += 6; 1612 } 1613 1614 zfs_acl_fixup_canonical_six(aclp, mode); 1615 } 1616 1617 int 1618 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode) 1619 { 1620 int error; 1621 1622 mutex_enter(&zp->z_lock); 1623 mutex_enter(&zp->z_acl_lock); 1624 *aclp = NULL; 1625 error = zfs_acl_node_read(zp, aclp, B_TRUE); 1626 if (error == 0) 1627 zfs_acl_chmod(zp, mode, *aclp); 1628 mutex_exit(&zp->z_acl_lock); 1629 mutex_exit(&zp->z_lock); 1630 return (error); 1631 } 1632 1633 /* 1634 * strip off write_owner and write_acl 1635 */ 1636 static void 1637 zfs_restricted_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep) 1638 { 1639 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1640 1641 if ((zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) && 1642 (aclp->z_ops.ace_type_get(acep) == ALLOW)) { 1643 mask &= ~RESTRICTED_CLEAR; 1644 aclp->z_ops.ace_mask_set(acep, mask); 1645 } 1646 } 1647 1648 /* 1649 * Should ACE be inherited? 1650 */ 1651 static int 1652 zfs_ace_can_use(znode_t *zp, uint16_t acep_flags) 1653 { 1654 int vtype = ZTOV(zp)->v_type; 1655 int iflags = (acep_flags & 0xf); 1656 1657 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE)) 1658 return (1); 1659 else if (iflags & ACE_FILE_INHERIT_ACE) 1660 return (!((vtype == VDIR) && 1661 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE))); 1662 return (0); 1663 } 1664 1665 /* 1666 * inherit inheritable ACEs from parent 1667 */ 1668 static zfs_acl_t * 1669 zfs_acl_inherit(znode_t *zp, zfs_acl_t *paclp, boolean_t *need_chmod) 1670 { 1671 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1672 void *pacep; 1673 void *acep, *acep2; 1674 zfs_acl_node_t *aclnode, *aclnode2; 1675 zfs_acl_t *aclp = NULL; 1676 uint64_t who; 1677 uint32_t access_mask; 1678 uint16_t iflags, newflags, type; 1679 size_t ace_size; 1680 void *data1, *data2; 1681 size_t data1sz, data2sz; 1682 enum vtype vntype = ZTOV(zp)->v_type; 1683 1684 *need_chmod = B_TRUE; 1685 pacep = NULL; 1686 aclp = zfs_acl_alloc(paclp->z_version); 1687 if (zfsvfs->z_acl_inherit != ZFS_ACL_DISCARD) { 1688 while (pacep = zfs_acl_next_ace(paclp, pacep, &who, 1689 &access_mask, &iflags, &type)) { 1690 1691 /* 1692 * don't inherit bogus ACEs 1693 */ 1694 if (!zfs_acl_valid_ace_type(type, iflags)) 1695 continue; 1696 1697 if (zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW && 1698 type == ALLOW) 1699 continue; 1700 1701 ace_size = aclp->z_ops.ace_size(pacep); 1702 1703 if (!zfs_ace_can_use(zp, iflags)) 1704 continue; 1705 1706 /* 1707 * If owner@, group@, or everyone@ inheritable 1708 * then zfs_acl_chmod() isn't needed. 1709 */ 1710 if (zfsvfs->z_acl_inherit == 1711 ZFS_ACL_PASSTHROUGH && 1712 ((iflags & (ACE_OWNER|ACE_EVERYONE)) || 1713 ((iflags & OWNING_GROUP) == 1714 OWNING_GROUP)) && (vntype == VREG || 1715 (vntype == VDIR && 1716 (iflags & ACE_DIRECTORY_INHERIT_ACE)))) 1717 *need_chmod = B_FALSE; 1718 1719 aclnode = zfs_acl_node_alloc(ace_size); 1720 list_insert_tail(&aclp->z_acl, aclnode); 1721 acep = aclnode->z_acldata; 1722 zfs_set_ace(aclp, acep, access_mask, type, 1723 who, iflags|ACE_INHERITED_ACE); 1724 1725 /* 1726 * Copy special opaque data if any 1727 */ 1728 if ((data1sz = paclp->z_ops.ace_data(pacep, 1729 &data1)) != 0) { 1730 VERIFY((data2sz = aclp->z_ops.ace_data(acep, 1731 &data2)) == data1sz); 1732 bcopy(data1, data2, data2sz); 1733 } 1734 aclp->z_acl_count++; 1735 aclnode->z_ace_count++; 1736 aclp->z_acl_bytes += aclnode->z_size; 1737 newflags = aclp->z_ops.ace_flags_get(acep); 1738 1739 if (vntype == VDIR) 1740 aclp->z_hints |= ZFS_INHERIT_ACE; 1741 1742 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || 1743 (vntype != VDIR)) { 1744 newflags &= ~ALL_INHERIT; 1745 aclp->z_ops.ace_flags_set(acep, 1746 newflags|ACE_INHERITED_ACE); 1747 zfs_restricted_update(zfsvfs, aclp, acep); 1748 continue; 1749 } 1750 1751 ASSERT(vntype == VDIR); 1752 1753 newflags = aclp->z_ops.ace_flags_get(acep); 1754 if ((iflags & (ACE_FILE_INHERIT_ACE | 1755 ACE_DIRECTORY_INHERIT_ACE)) != 1756 ACE_FILE_INHERIT_ACE) { 1757 aclnode2 = zfs_acl_node_alloc(ace_size); 1758 list_insert_tail(&aclp->z_acl, aclnode2); 1759 acep2 = aclnode2->z_acldata; 1760 zfs_set_ace(aclp, acep2, 1761 access_mask, type, who, 1762 iflags|ACE_INHERITED_ACE); 1763 newflags |= ACE_INHERIT_ONLY_ACE; 1764 aclp->z_ops.ace_flags_set(acep, newflags); 1765 newflags &= ~ALL_INHERIT; 1766 aclp->z_ops.ace_flags_set(acep2, 1767 newflags|ACE_INHERITED_ACE); 1768 1769 /* 1770 * Copy special opaque data if any 1771 */ 1772 if ((data1sz = aclp->z_ops.ace_data(acep, 1773 &data1)) != 0) { 1774 VERIFY((data2sz = 1775 aclp->z_ops.ace_data(acep2, 1776 &data2)) == data1sz); 1777 bcopy(data1, data2, data1sz); 1778 } 1779 aclp->z_acl_count++; 1780 aclnode2->z_ace_count++; 1781 aclp->z_acl_bytes += aclnode->z_size; 1782 zfs_restricted_update(zfsvfs, aclp, acep2); 1783 } else { 1784 newflags |= ACE_INHERIT_ONLY_ACE; 1785 aclp->z_ops.ace_flags_set(acep, 1786 newflags|ACE_INHERITED_ACE); 1787 } 1788 } 1789 } 1790 return (aclp); 1791 } 1792 1793 /* 1794 * Create file system object initial permissions 1795 * including inheritable ACEs. 1796 */ 1797 void 1798 zfs_perm_init(znode_t *zp, znode_t *parent, int flag, 1799 vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 1800 zfs_acl_t *setaclp, zfs_fuid_info_t **fuidp) 1801 { 1802 uint64_t mode, fuid, fgid; 1803 int error; 1804 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1805 zfs_acl_t *aclp = NULL; 1806 zfs_acl_t *paclp; 1807 xvattr_t *xvap = (xvattr_t *)vap; 1808 gid_t gid; 1809 boolean_t need_chmod = B_TRUE; 1810 1811 if (setaclp) 1812 aclp = setaclp; 1813 1814 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1815 1816 /* 1817 * Determine uid and gid. 1818 */ 1819 if ((flag & (IS_ROOT_NODE | IS_REPLAY)) || 1820 ((flag & IS_XATTR) && (vap->va_type == VDIR))) { 1821 fuid = zfs_fuid_create(zfsvfs, vap->va_uid, cr, 1822 ZFS_OWNER, tx, fuidp); 1823 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1824 ZFS_GROUP, tx, fuidp); 1825 gid = vap->va_gid; 1826 } else { 1827 fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER, tx, cr, fuidp); 1828 fgid = 0; 1829 if (vap->va_mask & AT_GID) { 1830 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1831 ZFS_GROUP, tx, fuidp); 1832 gid = vap->va_gid; 1833 if (fgid != parent->z_phys->zp_gid && 1834 !groupmember(vap->va_gid, cr) && 1835 secpolicy_vnode_create_gid(cr) != 0) 1836 fgid = 0; 1837 } 1838 if (fgid == 0) { 1839 if (parent->z_phys->zp_mode & S_ISGID) { 1840 fgid = parent->z_phys->zp_gid; 1841 gid = zfs_fuid_map_id(zfsvfs, fgid, 1842 cr, ZFS_GROUP); 1843 } else { 1844 fgid = zfs_fuid_create_cred(zfsvfs, 1845 ZFS_GROUP, tx, cr, fuidp); 1846 gid = crgetgid(cr); 1847 } 1848 } 1849 } 1850 1851 /* 1852 * If we're creating a directory, and the parent directory has the 1853 * set-GID bit set, set in on the new directory. 1854 * Otherwise, if the user is neither privileged nor a member of the 1855 * file's new group, clear the file's set-GID bit. 1856 */ 1857 1858 if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR)) { 1859 mode |= S_ISGID; 1860 } else { 1861 if ((mode & S_ISGID) && 1862 secpolicy_vnode_setids_setgids(cr, gid) != 0) 1863 mode &= ~S_ISGID; 1864 } 1865 1866 zp->z_phys->zp_uid = fuid; 1867 zp->z_phys->zp_gid = fgid; 1868 zp->z_phys->zp_mode = mode; 1869 1870 if (aclp == NULL) { 1871 mutex_enter(&parent->z_lock); 1872 if ((ZTOV(parent)->v_type == VDIR && 1873 (parent->z_phys->zp_flags & ZFS_INHERIT_ACE)) && 1874 !(zp->z_phys->zp_flags & ZFS_XATTR)) { 1875 mutex_enter(&parent->z_acl_lock); 1876 VERIFY(0 == zfs_acl_node_read(parent, &paclp, B_FALSE)); 1877 mutex_exit(&parent->z_acl_lock); 1878 aclp = zfs_acl_inherit(zp, paclp, &need_chmod); 1879 zfs_acl_free(paclp); 1880 } else { 1881 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1882 } 1883 mutex_exit(&parent->z_lock); 1884 mutex_enter(&zp->z_lock); 1885 mutex_enter(&zp->z_acl_lock); 1886 if (need_chmod) 1887 zfs_acl_chmod(zp, mode, aclp); 1888 } else { 1889 mutex_enter(&zp->z_lock); 1890 mutex_enter(&zp->z_acl_lock); 1891 } 1892 1893 /* Force auto_inherit on all new directory objects */ 1894 if (vap->va_type == VDIR) 1895 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 1896 1897 error = zfs_aclset_common(zp, aclp, cr, fuidp, tx); 1898 1899 /* Set optional attributes if any */ 1900 if (vap->va_mask & AT_XVATTR) 1901 zfs_xvattr_set(zp, xvap); 1902 1903 mutex_exit(&zp->z_lock); 1904 mutex_exit(&zp->z_acl_lock); 1905 ASSERT3U(error, ==, 0); 1906 1907 if (aclp != setaclp) 1908 zfs_acl_free(aclp); 1909 } 1910 1911 /* 1912 * Retrieve a files ACL 1913 */ 1914 int 1915 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1916 { 1917 zfs_acl_t *aclp; 1918 ulong_t mask; 1919 int error; 1920 int count = 0; 1921 int largeace = 0; 1922 1923 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1924 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1925 1926 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)) 1927 return (error); 1928 1929 if (mask == 0) 1930 return (ENOSYS); 1931 1932 mutex_enter(&zp->z_acl_lock); 1933 1934 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 1935 if (error != 0) { 1936 mutex_exit(&zp->z_acl_lock); 1937 return (error); 1938 } 1939 1940 /* 1941 * Scan ACL to determine number of ACEs 1942 */ 1943 if ((zp->z_phys->zp_flags & ZFS_ACL_OBJ_ACE) && 1944 !(mask & VSA_ACE_ALLTYPES)) { 1945 void *zacep = NULL; 1946 uint64_t who; 1947 uint32_t access_mask; 1948 uint16_t type, iflags; 1949 1950 while (zacep = zfs_acl_next_ace(aclp, zacep, 1951 &who, &access_mask, &iflags, &type)) { 1952 switch (type) { 1953 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1954 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1955 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1956 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1957 largeace++; 1958 continue; 1959 default: 1960 count++; 1961 } 1962 } 1963 vsecp->vsa_aclcnt = count; 1964 } else 1965 count = aclp->z_acl_count; 1966 1967 if (mask & VSA_ACECNT) { 1968 vsecp->vsa_aclcnt = count; 1969 } 1970 1971 if (mask & VSA_ACE) { 1972 size_t aclsz; 1973 1974 zfs_acl_node_t *aclnode = list_head(&aclp->z_acl); 1975 1976 aclsz = count * sizeof (ace_t) + 1977 sizeof (ace_object_t) * largeace; 1978 1979 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 1980 vsecp->vsa_aclentsz = aclsz; 1981 1982 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 1983 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr, 1984 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 1985 else { 1986 bcopy(aclnode->z_acldata, vsecp->vsa_aclentp, 1987 count * sizeof (ace_t)); 1988 } 1989 } 1990 if (mask & VSA_ACE_ACLFLAGS) { 1991 vsecp->vsa_aclflags = 0; 1992 if (zp->z_phys->zp_flags & ZFS_ACL_DEFAULTED) 1993 vsecp->vsa_aclflags |= ACL_DEFAULTED; 1994 if (zp->z_phys->zp_flags & ZFS_ACL_PROTECTED) 1995 vsecp->vsa_aclflags |= ACL_PROTECTED; 1996 if (zp->z_phys->zp_flags & ZFS_ACL_AUTO_INHERIT) 1997 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 1998 } 1999 2000 mutex_exit(&zp->z_acl_lock); 2001 2002 zfs_acl_free(aclp); 2003 2004 return (0); 2005 } 2006 2007 int 2008 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type, 2009 vsecattr_t *vsecp, zfs_acl_t **zaclp) 2010 { 2011 zfs_acl_t *aclp; 2012 zfs_acl_node_t *aclnode; 2013 int aclcnt = vsecp->vsa_aclcnt; 2014 int error; 2015 2016 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 2017 return (EINVAL); 2018 2019 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 2020 2021 aclp->z_hints = 0; 2022 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 2023 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 2024 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp, 2025 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 2026 aclcnt, &aclnode->z_size)) != 0) { 2027 zfs_acl_free(aclp); 2028 zfs_acl_node_free(aclnode); 2029 return (error); 2030 } 2031 } else { 2032 if ((error = zfs_copy_ace_2_fuid(obj_type, aclp, 2033 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 2034 &aclnode->z_size)) != 0) { 2035 zfs_acl_free(aclp); 2036 zfs_acl_node_free(aclnode); 2037 return (error); 2038 } 2039 } 2040 aclp->z_acl_bytes = aclnode->z_size; 2041 aclnode->z_ace_count = aclcnt; 2042 aclp->z_acl_count = aclcnt; 2043 list_insert_head(&aclp->z_acl, aclnode); 2044 2045 /* 2046 * If flags are being set then add them to z_hints 2047 */ 2048 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2049 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2050 aclp->z_hints |= ZFS_ACL_PROTECTED; 2051 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2052 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2053 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2054 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2055 } 2056 2057 *zaclp = aclp; 2058 2059 return (0); 2060 } 2061 2062 /* 2063 * Set a files ACL 2064 */ 2065 int 2066 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2067 { 2068 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2069 zilog_t *zilog = zfsvfs->z_log; 2070 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2071 dmu_tx_t *tx; 2072 int error; 2073 zfs_acl_t *aclp; 2074 zfs_fuid_info_t *fuidp = NULL; 2075 2076 if (mask == 0) 2077 return (ENOSYS); 2078 2079 if (zp->z_phys->zp_flags & ZFS_IMMUTABLE) 2080 return (EPERM); 2081 2082 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) 2083 return (error); 2084 2085 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, &aclp); 2086 if (error) 2087 return (error); 2088 2089 /* 2090 * If ACL wide flags aren't being set then preserve any 2091 * existing flags. 2092 */ 2093 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2094 aclp->z_hints |= (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 2095 } 2096 top: 2097 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) { 2098 zfs_acl_free(aclp); 2099 return (error); 2100 } 2101 2102 mutex_enter(&zp->z_lock); 2103 mutex_enter(&zp->z_acl_lock); 2104 2105 tx = dmu_tx_create(zfsvfs->z_os); 2106 dmu_tx_hold_bonus(tx, zp->z_id); 2107 2108 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 2109 /* Are we upgrading ACL? */ 2110 if (zfsvfs->z_version <= ZPL_VERSION_FUID && 2111 zp->z_phys->zp_acl.z_acl_version == 2112 ZFS_ACL_VERSION_INITIAL) { 2113 dmu_tx_hold_free(tx, 2114 zp->z_phys->zp_acl.z_acl_extern_obj, 2115 0, DMU_OBJECT_END); 2116 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2117 0, aclp->z_acl_bytes); 2118 } else { 2119 dmu_tx_hold_write(tx, 2120 zp->z_phys->zp_acl.z_acl_extern_obj, 2121 0, aclp->z_acl_bytes); 2122 } 2123 } else if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2124 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2125 } 2126 if (aclp->z_has_fuids) { 2127 if (zfsvfs->z_fuid_obj == 0) { 2128 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 2129 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2130 FUID_SIZE_ESTIMATE(zfsvfs)); 2131 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); 2132 } else { 2133 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj); 2134 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0, 2135 FUID_SIZE_ESTIMATE(zfsvfs)); 2136 } 2137 } 2138 2139 error = dmu_tx_assign(tx, zfsvfs->z_assign); 2140 if (error) { 2141 mutex_exit(&zp->z_acl_lock); 2142 mutex_exit(&zp->z_lock); 2143 2144 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2145 dmu_tx_wait(tx); 2146 dmu_tx_abort(tx); 2147 goto top; 2148 } 2149 dmu_tx_abort(tx); 2150 zfs_acl_free(aclp); 2151 return (error); 2152 } 2153 2154 error = zfs_aclset_common(zp, aclp, cr, &fuidp, tx); 2155 ASSERT(error == 0); 2156 2157 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2158 2159 if (fuidp) 2160 zfs_fuid_info_free(fuidp); 2161 zfs_acl_free(aclp); 2162 dmu_tx_commit(tx); 2163 done: 2164 mutex_exit(&zp->z_acl_lock); 2165 mutex_exit(&zp->z_lock); 2166 2167 return (error); 2168 } 2169 2170 /* 2171 * working_mode returns the permissions that were not granted 2172 */ 2173 static int 2174 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2175 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr) 2176 { 2177 zfs_acl_t *aclp; 2178 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2179 int error; 2180 uid_t uid = crgetuid(cr); 2181 uint64_t who; 2182 uint16_t type, iflags; 2183 uint16_t entry_type; 2184 uint32_t access_mask; 2185 uint32_t deny_mask = 0; 2186 zfs_ace_hdr_t *acep = NULL; 2187 boolean_t checkit; 2188 uid_t fowner; 2189 uid_t gowner; 2190 2191 /* 2192 * Short circuit empty requests 2193 */ 2194 if (v4_mode == 0) 2195 return (0); 2196 2197 *check_privs = B_TRUE; 2198 2199 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ 2200 *working_mode = 0; 2201 return (0); 2202 } 2203 2204 *working_mode = v4_mode; 2205 2206 if ((v4_mode & WRITE_MASK) && 2207 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && 2208 (!IS_DEVVP(ZTOV(zp)))) { 2209 *check_privs = B_FALSE; 2210 return (EROFS); 2211 } 2212 2213 /* 2214 * Only check for READONLY on non-directories. 2215 */ 2216 if ((v4_mode & WRITE_MASK_DATA) && 2217 (((ZTOV(zp)->v_type != VDIR) && 2218 (zp->z_phys->zp_flags & (ZFS_READONLY | ZFS_IMMUTABLE))) || 2219 (ZTOV(zp)->v_type == VDIR && 2220 (zp->z_phys->zp_flags & ZFS_IMMUTABLE)))) { 2221 *check_privs = B_FALSE; 2222 return (EPERM); 2223 } 2224 2225 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2226 (zp->z_phys->zp_flags & ZFS_NOUNLINK)) { 2227 *check_privs = B_FALSE; 2228 return (EPERM); 2229 } 2230 2231 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2232 (zp->z_phys->zp_flags & ZFS_AV_QUARANTINED))) { 2233 *check_privs = B_FALSE; 2234 return (EACCES); 2235 } 2236 2237 /* 2238 * The caller requested that the ACL check be skipped. This 2239 * would only happen if the caller checked VOP_ACCESS() with a 2240 * 32 bit ACE mask and already had the appropriate permissions. 2241 */ 2242 if (skipaclchk) { 2243 *working_mode = 0; 2244 return (0); 2245 } 2246 2247 zfs_fuid_map_ids(zp, cr, &fowner, &gowner); 2248 2249 mutex_enter(&zp->z_acl_lock); 2250 2251 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 2252 if (error != 0) { 2253 mutex_exit(&zp->z_acl_lock); 2254 return (error); 2255 } 2256 2257 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2258 &iflags, &type)) { 2259 2260 if (!zfs_acl_valid_ace_type(type, iflags)) 2261 continue; 2262 2263 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE)) 2264 continue; 2265 2266 entry_type = (iflags & ACE_TYPE_FLAGS); 2267 2268 checkit = B_FALSE; 2269 2270 switch (entry_type) { 2271 case ACE_OWNER: 2272 if (uid == fowner) 2273 checkit = B_TRUE; 2274 break; 2275 case OWNING_GROUP: 2276 who = gowner; 2277 /*FALLTHROUGH*/ 2278 case ACE_IDENTIFIER_GROUP: 2279 checkit = zfs_groupmember(zfsvfs, who, cr); 2280 break; 2281 case ACE_EVERYONE: 2282 checkit = B_TRUE; 2283 break; 2284 2285 /* USER Entry */ 2286 default: 2287 if (entry_type == 0) { 2288 uid_t newid; 2289 2290 newid = zfs_fuid_map_id(zfsvfs, who, cr, 2291 ZFS_ACE_USER); 2292 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2293 uid == newid) 2294 checkit = B_TRUE; 2295 break; 2296 } else { 2297 zfs_acl_free(aclp); 2298 mutex_exit(&zp->z_acl_lock); 2299 return (EIO); 2300 } 2301 } 2302 2303 if (checkit) { 2304 uint32_t mask_matched = (access_mask & *working_mode); 2305 2306 if (mask_matched) { 2307 if (type == DENY) 2308 deny_mask |= mask_matched; 2309 2310 *working_mode &= ~mask_matched; 2311 } 2312 } 2313 2314 /* Are we done? */ 2315 if (*working_mode == 0) 2316 break; 2317 } 2318 2319 mutex_exit(&zp->z_acl_lock); 2320 zfs_acl_free(aclp); 2321 2322 /* Put the found 'denies' back on the working mode */ 2323 if (deny_mask) { 2324 *working_mode |= deny_mask; 2325 return (EACCES); 2326 } else if (*working_mode) { 2327 return (-1); 2328 } 2329 2330 return (0); 2331 } 2332 2333 static int 2334 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2335 cred_t *cr) 2336 { 2337 if (*working_mode != ACE_WRITE_DATA) 2338 return (EACCES); 2339 2340 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2341 check_privs, B_FALSE, cr)); 2342 } 2343 2344 /* 2345 * Determine whether Access should be granted/denied, invoking least 2346 * priv subsytem when a deny is determined. 2347 */ 2348 int 2349 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) 2350 { 2351 uint32_t working_mode; 2352 int error; 2353 int is_attr; 2354 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2355 boolean_t check_privs; 2356 znode_t *xzp; 2357 znode_t *check_zp = zp; 2358 2359 is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && 2360 (ZTOV(zp)->v_type == VDIR)); 2361 2362 /* 2363 * If attribute then validate against base file 2364 */ 2365 if (is_attr) { 2366 if ((error = zfs_zget(zp->z_zfsvfs, 2367 zp->z_phys->zp_parent, &xzp)) != 0) { 2368 return (error); 2369 } 2370 2371 check_zp = xzp; 2372 2373 /* 2374 * fixup mode to map to xattr perms 2375 */ 2376 2377 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2378 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2379 mode |= ACE_WRITE_NAMED_ATTRS; 2380 } 2381 2382 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2383 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2384 mode |= ACE_READ_NAMED_ATTRS; 2385 } 2386 } 2387 2388 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2389 &check_privs, skipaclchk, cr)) == 0) { 2390 if (is_attr) 2391 VN_RELE(ZTOV(xzp)); 2392 return (0); 2393 } 2394 2395 if (error && !check_privs) { 2396 if (is_attr) 2397 VN_RELE(ZTOV(xzp)); 2398 return (error); 2399 } 2400 2401 if (error && (flags & V_APPEND)) { 2402 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr); 2403 } 2404 2405 if (error && check_privs) { 2406 uid_t owner; 2407 mode_t checkmode = 0; 2408 2409 owner = zfs_fuid_map_id(zfsvfs, check_zp->z_phys->zp_uid, cr, 2410 ZFS_OWNER); 2411 2412 /* 2413 * First check for implicit owner permission on 2414 * read_acl/read_attributes 2415 */ 2416 2417 error = 0; 2418 ASSERT(working_mode != 0); 2419 2420 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2421 owner == crgetuid(cr))) 2422 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2423 2424 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2425 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE)) 2426 checkmode |= VREAD; 2427 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2428 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE)) 2429 checkmode |= VWRITE; 2430 if (working_mode & ACE_EXECUTE) 2431 checkmode |= VEXEC; 2432 2433 if (checkmode) 2434 error = secpolicy_vnode_access(cr, ZTOV(check_zp), 2435 owner, checkmode); 2436 2437 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2438 error = secpolicy_vnode_chown(cr, B_TRUE); 2439 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2440 error = secpolicy_vnode_setdac(cr, owner); 2441 2442 if (error == 0 && (working_mode & 2443 (ACE_DELETE|ACE_DELETE_CHILD))) 2444 error = secpolicy_vnode_remove(cr); 2445 2446 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) { 2447 error = secpolicy_vnode_chown(cr, B_FALSE); 2448 } 2449 if (error == 0) { 2450 /* 2451 * See if any bits other than those already checked 2452 * for are still present. If so then return EACCES 2453 */ 2454 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2455 error = EACCES; 2456 } 2457 } 2458 } 2459 2460 if (is_attr) 2461 VN_RELE(ZTOV(xzp)); 2462 2463 return (error); 2464 } 2465 2466 /* 2467 * Translate traditional unix VREAD/VWRITE/VEXEC mode into 2468 * native ACL format and call zfs_zaccess() 2469 */ 2470 int 2471 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr) 2472 { 2473 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr)); 2474 } 2475 2476 /* 2477 * Access function for secpolicy_vnode_setattr 2478 */ 2479 int 2480 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr) 2481 { 2482 int v4_mode = zfs_unix_to_v4(mode >> 6); 2483 2484 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr)); 2485 } 2486 2487 static int 2488 zfs_delete_final_check(znode_t *zp, znode_t *dzp, 2489 mode_t missing_perms, cred_t *cr) 2490 { 2491 int error; 2492 uid_t downer; 2493 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2494 2495 downer = zfs_fuid_map_id(zfsvfs, dzp->z_phys->zp_uid, cr, ZFS_OWNER); 2496 2497 error = secpolicy_vnode_access(cr, ZTOV(dzp), downer, missing_perms); 2498 2499 if (error == 0) 2500 error = zfs_sticky_remove_access(dzp, zp, cr); 2501 2502 return (error); 2503 } 2504 2505 /* 2506 * Determine whether Access should be granted/deny, without 2507 * consulting least priv subsystem. 2508 * 2509 * 2510 * The following chart is the recommended NFSv4 enforcement for 2511 * ability to delete an object. 2512 * 2513 * ------------------------------------------------------- 2514 * | Parent Dir | Target Object Permissions | 2515 * | permissions | | 2516 * ------------------------------------------------------- 2517 * | | ACL Allows | ACL Denies| Delete | 2518 * | | Delete | Delete | unspecified| 2519 * ------------------------------------------------------- 2520 * | ACL Allows | Permit | Permit | Permit | 2521 * | DELETE_CHILD | | 2522 * ------------------------------------------------------- 2523 * | ACL Denies | Permit | Deny | Deny | 2524 * | DELETE_CHILD | | | | 2525 * ------------------------------------------------------- 2526 * | ACL specifies | | | | 2527 * | only allow | Permit | Permit | Permit | 2528 * | write and | | | | 2529 * | execute | | | | 2530 * ------------------------------------------------------- 2531 * | ACL denies | | | | 2532 * | write and | Permit | Deny | Deny | 2533 * | execute | | | | 2534 * ------------------------------------------------------- 2535 * ^ 2536 * | 2537 * No search privilege, can't even look up file? 2538 * 2539 */ 2540 int 2541 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr) 2542 { 2543 uint32_t dzp_working_mode = 0; 2544 uint32_t zp_working_mode = 0; 2545 int dzp_error, zp_error; 2546 mode_t missing_perms; 2547 boolean_t dzpcheck_privs = B_TRUE; 2548 boolean_t zpcheck_privs = B_TRUE; 2549 2550 /* 2551 * We want specific DELETE permissions to 2552 * take precedence over WRITE/EXECUTE. We don't 2553 * want an ACL such as this to mess us up. 2554 * user:joe:write_data:deny,user:joe:delete:allow 2555 * 2556 * However, deny permissions may ultimately be overridden 2557 * by secpolicy_vnode_access(). 2558 * 2559 * We will ask for all of the necessary permissions and then 2560 * look at the working modes from the directory and target object 2561 * to determine what was found. 2562 */ 2563 2564 if (zp->z_phys->zp_flags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2565 return (EPERM); 2566 2567 /* 2568 * First row 2569 * If the directory permissions allow the delete, we are done. 2570 */ 2571 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD, 2572 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2573 return (0); 2574 2575 /* 2576 * If target object has delete permission then we are done 2577 */ 2578 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2579 &zpcheck_privs, B_FALSE, cr)) == 0) 2580 return (0); 2581 2582 ASSERT(dzp_error && zp_error); 2583 2584 if (!dzpcheck_privs) 2585 return (dzp_error); 2586 if (!zpcheck_privs) 2587 return (zp_error); 2588 2589 /* 2590 * Second row 2591 * 2592 * If directory returns EACCES then delete_child was denied 2593 * due to deny delete_child. In this case send the request through 2594 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check() 2595 * since that *could* allow the delete based on write/execute permission 2596 * and we want delete permissions to override write/execute. 2597 */ 2598 2599 if (dzp_error == EACCES) 2600 return (secpolicy_vnode_remove(cr)); 2601 2602 /* 2603 * Third Row 2604 * only need to see if we have write/execute on directory. 2605 */ 2606 2607 if ((dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA, 2608 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2609 return (zfs_sticky_remove_access(dzp, zp, cr)); 2610 2611 if (!dzpcheck_privs) 2612 return (dzp_error); 2613 2614 /* 2615 * Fourth row 2616 */ 2617 2618 missing_perms = (dzp_working_mode & ACE_WRITE_DATA) ? VWRITE : 0; 2619 missing_perms |= (dzp_working_mode & ACE_EXECUTE) ? VEXEC : 0; 2620 2621 ASSERT(missing_perms); 2622 2623 return (zfs_delete_final_check(zp, dzp, missing_perms, cr)); 2624 2625 } 2626 2627 int 2628 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2629 znode_t *tzp, cred_t *cr) 2630 { 2631 int add_perm; 2632 int error; 2633 2634 if (szp->z_phys->zp_flags & ZFS_AV_QUARANTINED) 2635 return (EACCES); 2636 2637 add_perm = (ZTOV(szp)->v_type == VDIR) ? 2638 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 2639 2640 /* 2641 * Rename permissions are combination of delete permission + 2642 * add file/subdir permission. 2643 */ 2644 2645 /* 2646 * first make sure we do the delete portion. 2647 * 2648 * If that succeeds then check for add_file/add_subdir permissions 2649 */ 2650 2651 if (error = zfs_zaccess_delete(sdzp, szp, cr)) 2652 return (error); 2653 2654 /* 2655 * If we have a tzp, see if we can delete it? 2656 */ 2657 if (tzp) { 2658 if (error = zfs_zaccess_delete(tdzp, tzp, cr)) 2659 return (error); 2660 } 2661 2662 /* 2663 * Now check for add permissions 2664 */ 2665 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr); 2666 2667 return (error); 2668 } 2669