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, uint64_t mode, 1670 boolean_t *need_chmod) 1671 { 1672 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1673 void *pacep; 1674 void *acep, *acep2; 1675 zfs_acl_node_t *aclnode, *aclnode2; 1676 zfs_acl_t *aclp = NULL; 1677 uint64_t who; 1678 uint32_t access_mask; 1679 uint16_t iflags, newflags, type; 1680 size_t ace_size; 1681 void *data1, *data2; 1682 size_t data1sz, data2sz; 1683 boolean_t vdir = ZTOV(zp)->v_type == VDIR; 1684 boolean_t vreg = ZTOV(zp)->v_type == VREG; 1685 boolean_t passthrough, passthrough_x, noallow; 1686 1687 passthrough_x = 1688 zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X; 1689 passthrough = passthrough_x || 1690 zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH; 1691 noallow = 1692 zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW; 1693 1694 *need_chmod = B_TRUE; 1695 pacep = NULL; 1696 aclp = zfs_acl_alloc(paclp->z_version); 1697 if (zfsvfs->z_acl_inherit == ZFS_ACL_DISCARD) 1698 return (aclp); 1699 while (pacep = zfs_acl_next_ace(paclp, pacep, &who, 1700 &access_mask, &iflags, &type)) { 1701 1702 /* 1703 * don't inherit bogus ACEs 1704 */ 1705 if (!zfs_acl_valid_ace_type(type, iflags)) 1706 continue; 1707 1708 if (noallow && type == ALLOW) 1709 continue; 1710 1711 ace_size = aclp->z_ops.ace_size(pacep); 1712 1713 if (!zfs_ace_can_use(zp, iflags)) 1714 continue; 1715 1716 /* 1717 * If owner@, group@, or everyone@ inheritable 1718 * then zfs_acl_chmod() isn't needed. 1719 */ 1720 if (passthrough && 1721 ((iflags & (ACE_OWNER|ACE_EVERYONE)) || 1722 ((iflags & OWNING_GROUP) == 1723 OWNING_GROUP)) && (vreg || (vdir && (iflags & 1724 ACE_DIRECTORY_INHERIT_ACE)))) { 1725 *need_chmod = B_FALSE; 1726 1727 if (!vdir && passthrough_x && 1728 ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) { 1729 access_mask &= ~ACE_EXECUTE; 1730 } 1731 } 1732 1733 aclnode = zfs_acl_node_alloc(ace_size); 1734 list_insert_tail(&aclp->z_acl, aclnode); 1735 acep = aclnode->z_acldata; 1736 1737 zfs_set_ace(aclp, acep, access_mask, type, 1738 who, iflags|ACE_INHERITED_ACE); 1739 1740 /* 1741 * Copy special opaque data if any 1742 */ 1743 if ((data1sz = paclp->z_ops.ace_data(pacep, &data1)) != 0) { 1744 VERIFY((data2sz = aclp->z_ops.ace_data(acep, 1745 &data2)) == data1sz); 1746 bcopy(data1, data2, data2sz); 1747 } 1748 aclp->z_acl_count++; 1749 aclnode->z_ace_count++; 1750 aclp->z_acl_bytes += aclnode->z_size; 1751 newflags = aclp->z_ops.ace_flags_get(acep); 1752 1753 if (vdir) 1754 aclp->z_hints |= ZFS_INHERIT_ACE; 1755 1756 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) { 1757 newflags &= ~ALL_INHERIT; 1758 aclp->z_ops.ace_flags_set(acep, 1759 newflags|ACE_INHERITED_ACE); 1760 zfs_restricted_update(zfsvfs, aclp, acep); 1761 continue; 1762 } 1763 1764 ASSERT(vdir); 1765 1766 newflags = aclp->z_ops.ace_flags_get(acep); 1767 if ((iflags & (ACE_FILE_INHERIT_ACE | 1768 ACE_DIRECTORY_INHERIT_ACE)) != 1769 ACE_FILE_INHERIT_ACE) { 1770 aclnode2 = zfs_acl_node_alloc(ace_size); 1771 list_insert_tail(&aclp->z_acl, aclnode2); 1772 acep2 = aclnode2->z_acldata; 1773 zfs_set_ace(aclp, acep2, 1774 access_mask, type, who, 1775 iflags|ACE_INHERITED_ACE); 1776 newflags |= ACE_INHERIT_ONLY_ACE; 1777 aclp->z_ops.ace_flags_set(acep, newflags); 1778 newflags &= ~ALL_INHERIT; 1779 aclp->z_ops.ace_flags_set(acep2, 1780 newflags|ACE_INHERITED_ACE); 1781 1782 /* 1783 * Copy special opaque data if any 1784 */ 1785 if ((data1sz = aclp->z_ops.ace_data(acep, 1786 &data1)) != 0) { 1787 VERIFY((data2sz = 1788 aclp->z_ops.ace_data(acep2, 1789 &data2)) == data1sz); 1790 bcopy(data1, data2, data1sz); 1791 } 1792 aclp->z_acl_count++; 1793 aclnode2->z_ace_count++; 1794 aclp->z_acl_bytes += aclnode->z_size; 1795 zfs_restricted_update(zfsvfs, aclp, acep2); 1796 } else { 1797 newflags |= ACE_INHERIT_ONLY_ACE; 1798 aclp->z_ops.ace_flags_set(acep, 1799 newflags|ACE_INHERITED_ACE); 1800 } 1801 } 1802 return (aclp); 1803 } 1804 1805 /* 1806 * Create file system object initial permissions 1807 * including inheritable ACEs. 1808 */ 1809 void 1810 zfs_perm_init(znode_t *zp, znode_t *parent, int flag, 1811 vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 1812 zfs_acl_t *setaclp, zfs_fuid_info_t **fuidp) 1813 { 1814 uint64_t mode, fuid, fgid; 1815 int error; 1816 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1817 zfs_acl_t *aclp = NULL; 1818 zfs_acl_t *paclp; 1819 xvattr_t *xvap = (xvattr_t *)vap; 1820 gid_t gid; 1821 boolean_t need_chmod = B_TRUE; 1822 1823 if (setaclp) 1824 aclp = setaclp; 1825 1826 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1827 1828 /* 1829 * Determine uid and gid. 1830 */ 1831 if ((flag & (IS_ROOT_NODE | IS_REPLAY)) || 1832 ((flag & IS_XATTR) && (vap->va_type == VDIR))) { 1833 fuid = zfs_fuid_create(zfsvfs, vap->va_uid, cr, 1834 ZFS_OWNER, tx, fuidp); 1835 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1836 ZFS_GROUP, tx, fuidp); 1837 gid = vap->va_gid; 1838 } else { 1839 fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER, tx, cr, fuidp); 1840 fgid = 0; 1841 if (vap->va_mask & AT_GID) { 1842 fgid = zfs_fuid_create(zfsvfs, vap->va_gid, cr, 1843 ZFS_GROUP, tx, fuidp); 1844 gid = vap->va_gid; 1845 if (fgid != parent->z_phys->zp_gid && 1846 !groupmember(vap->va_gid, cr) && 1847 secpolicy_vnode_create_gid(cr) != 0) 1848 fgid = 0; 1849 } 1850 if (fgid == 0) { 1851 if (parent->z_phys->zp_mode & S_ISGID) { 1852 fgid = parent->z_phys->zp_gid; 1853 gid = zfs_fuid_map_id(zfsvfs, fgid, 1854 cr, ZFS_GROUP); 1855 } else { 1856 fgid = zfs_fuid_create_cred(zfsvfs, 1857 ZFS_GROUP, tx, cr, fuidp); 1858 gid = crgetgid(cr); 1859 } 1860 } 1861 } 1862 1863 /* 1864 * If we're creating a directory, and the parent directory has the 1865 * set-GID bit set, set in on the new directory. 1866 * Otherwise, if the user is neither privileged nor a member of the 1867 * file's new group, clear the file's set-GID bit. 1868 */ 1869 1870 if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR)) { 1871 mode |= S_ISGID; 1872 } else { 1873 if ((mode & S_ISGID) && 1874 secpolicy_vnode_setids_setgids(cr, gid) != 0) 1875 mode &= ~S_ISGID; 1876 } 1877 1878 zp->z_phys->zp_uid = fuid; 1879 zp->z_phys->zp_gid = fgid; 1880 zp->z_phys->zp_mode = mode; 1881 1882 if (aclp == NULL) { 1883 mutex_enter(&parent->z_lock); 1884 if ((ZTOV(parent)->v_type == VDIR && 1885 (parent->z_phys->zp_flags & ZFS_INHERIT_ACE)) && 1886 !(zp->z_phys->zp_flags & ZFS_XATTR)) { 1887 mutex_enter(&parent->z_acl_lock); 1888 VERIFY(0 == zfs_acl_node_read(parent, &paclp, B_FALSE)); 1889 mutex_exit(&parent->z_acl_lock); 1890 aclp = zfs_acl_inherit(zp, paclp, mode, &need_chmod); 1891 zfs_acl_free(paclp); 1892 } else { 1893 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1894 } 1895 mutex_exit(&parent->z_lock); 1896 mutex_enter(&zp->z_lock); 1897 mutex_enter(&zp->z_acl_lock); 1898 if (need_chmod) 1899 zfs_acl_chmod(zp, mode, aclp); 1900 } else { 1901 mutex_enter(&zp->z_lock); 1902 mutex_enter(&zp->z_acl_lock); 1903 } 1904 1905 /* Force auto_inherit on all new directory objects */ 1906 if (vap->va_type == VDIR) 1907 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 1908 1909 error = zfs_aclset_common(zp, aclp, cr, fuidp, tx); 1910 1911 /* Set optional attributes if any */ 1912 if (vap->va_mask & AT_XVATTR) 1913 zfs_xvattr_set(zp, xvap); 1914 1915 mutex_exit(&zp->z_lock); 1916 mutex_exit(&zp->z_acl_lock); 1917 ASSERT3U(error, ==, 0); 1918 1919 if (aclp != setaclp) 1920 zfs_acl_free(aclp); 1921 } 1922 1923 /* 1924 * Retrieve a files ACL 1925 */ 1926 int 1927 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1928 { 1929 zfs_acl_t *aclp; 1930 ulong_t mask; 1931 int error; 1932 int count = 0; 1933 int largeace = 0; 1934 1935 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1936 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1937 1938 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)) 1939 return (error); 1940 1941 if (mask == 0) 1942 return (ENOSYS); 1943 1944 mutex_enter(&zp->z_acl_lock); 1945 1946 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 1947 if (error != 0) { 1948 mutex_exit(&zp->z_acl_lock); 1949 return (error); 1950 } 1951 1952 /* 1953 * Scan ACL to determine number of ACEs 1954 */ 1955 if ((zp->z_phys->zp_flags & ZFS_ACL_OBJ_ACE) && 1956 !(mask & VSA_ACE_ALLTYPES)) { 1957 void *zacep = NULL; 1958 uint64_t who; 1959 uint32_t access_mask; 1960 uint16_t type, iflags; 1961 1962 while (zacep = zfs_acl_next_ace(aclp, zacep, 1963 &who, &access_mask, &iflags, &type)) { 1964 switch (type) { 1965 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1966 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1967 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1968 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1969 largeace++; 1970 continue; 1971 default: 1972 count++; 1973 } 1974 } 1975 vsecp->vsa_aclcnt = count; 1976 } else 1977 count = aclp->z_acl_count; 1978 1979 if (mask & VSA_ACECNT) { 1980 vsecp->vsa_aclcnt = count; 1981 } 1982 1983 if (mask & VSA_ACE) { 1984 size_t aclsz; 1985 1986 zfs_acl_node_t *aclnode = list_head(&aclp->z_acl); 1987 1988 aclsz = count * sizeof (ace_t) + 1989 sizeof (ace_object_t) * largeace; 1990 1991 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 1992 vsecp->vsa_aclentsz = aclsz; 1993 1994 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 1995 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr, 1996 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 1997 else { 1998 bcopy(aclnode->z_acldata, vsecp->vsa_aclentp, 1999 count * sizeof (ace_t)); 2000 } 2001 } 2002 if (mask & VSA_ACE_ACLFLAGS) { 2003 vsecp->vsa_aclflags = 0; 2004 if (zp->z_phys->zp_flags & ZFS_ACL_DEFAULTED) 2005 vsecp->vsa_aclflags |= ACL_DEFAULTED; 2006 if (zp->z_phys->zp_flags & ZFS_ACL_PROTECTED) 2007 vsecp->vsa_aclflags |= ACL_PROTECTED; 2008 if (zp->z_phys->zp_flags & ZFS_ACL_AUTO_INHERIT) 2009 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 2010 } 2011 2012 mutex_exit(&zp->z_acl_lock); 2013 2014 zfs_acl_free(aclp); 2015 2016 return (0); 2017 } 2018 2019 int 2020 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type, 2021 vsecattr_t *vsecp, zfs_acl_t **zaclp) 2022 { 2023 zfs_acl_t *aclp; 2024 zfs_acl_node_t *aclnode; 2025 int aclcnt = vsecp->vsa_aclcnt; 2026 int error; 2027 2028 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 2029 return (EINVAL); 2030 2031 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 2032 2033 aclp->z_hints = 0; 2034 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 2035 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 2036 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp, 2037 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 2038 aclcnt, &aclnode->z_size)) != 0) { 2039 zfs_acl_free(aclp); 2040 zfs_acl_node_free(aclnode); 2041 return (error); 2042 } 2043 } else { 2044 if ((error = zfs_copy_ace_2_fuid(obj_type, aclp, 2045 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 2046 &aclnode->z_size)) != 0) { 2047 zfs_acl_free(aclp); 2048 zfs_acl_node_free(aclnode); 2049 return (error); 2050 } 2051 } 2052 aclp->z_acl_bytes = aclnode->z_size; 2053 aclnode->z_ace_count = aclcnt; 2054 aclp->z_acl_count = aclcnt; 2055 list_insert_head(&aclp->z_acl, aclnode); 2056 2057 /* 2058 * If flags are being set then add them to z_hints 2059 */ 2060 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2061 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2062 aclp->z_hints |= ZFS_ACL_PROTECTED; 2063 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2064 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2065 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2066 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2067 } 2068 2069 *zaclp = aclp; 2070 2071 return (0); 2072 } 2073 2074 /* 2075 * Set a files ACL 2076 */ 2077 int 2078 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2079 { 2080 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2081 zilog_t *zilog = zfsvfs->z_log; 2082 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2083 dmu_tx_t *tx; 2084 int error; 2085 zfs_acl_t *aclp; 2086 zfs_fuid_info_t *fuidp = NULL; 2087 2088 if (mask == 0) 2089 return (ENOSYS); 2090 2091 if (zp->z_phys->zp_flags & ZFS_IMMUTABLE) 2092 return (EPERM); 2093 2094 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) 2095 return (error); 2096 2097 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, &aclp); 2098 if (error) 2099 return (error); 2100 2101 /* 2102 * If ACL wide flags aren't being set then preserve any 2103 * existing flags. 2104 */ 2105 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2106 aclp->z_hints |= (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 2107 } 2108 top: 2109 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) { 2110 zfs_acl_free(aclp); 2111 return (error); 2112 } 2113 2114 mutex_enter(&zp->z_lock); 2115 mutex_enter(&zp->z_acl_lock); 2116 2117 tx = dmu_tx_create(zfsvfs->z_os); 2118 dmu_tx_hold_bonus(tx, zp->z_id); 2119 2120 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 2121 /* Are we upgrading ACL? */ 2122 if (zfsvfs->z_version <= ZPL_VERSION_FUID && 2123 zp->z_phys->zp_acl.z_acl_version == 2124 ZFS_ACL_VERSION_INITIAL) { 2125 dmu_tx_hold_free(tx, 2126 zp->z_phys->zp_acl.z_acl_extern_obj, 2127 0, DMU_OBJECT_END); 2128 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2129 0, aclp->z_acl_bytes); 2130 } else { 2131 dmu_tx_hold_write(tx, 2132 zp->z_phys->zp_acl.z_acl_extern_obj, 2133 0, aclp->z_acl_bytes); 2134 } 2135 } else if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2136 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2137 } 2138 if (aclp->z_has_fuids) { 2139 if (zfsvfs->z_fuid_obj == 0) { 2140 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 2141 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2142 FUID_SIZE_ESTIMATE(zfsvfs)); 2143 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); 2144 } else { 2145 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj); 2146 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0, 2147 FUID_SIZE_ESTIMATE(zfsvfs)); 2148 } 2149 } 2150 2151 error = dmu_tx_assign(tx, TXG_NOWAIT); 2152 if (error) { 2153 mutex_exit(&zp->z_acl_lock); 2154 mutex_exit(&zp->z_lock); 2155 2156 if (error == ERESTART) { 2157 dmu_tx_wait(tx); 2158 dmu_tx_abort(tx); 2159 goto top; 2160 } 2161 dmu_tx_abort(tx); 2162 zfs_acl_free(aclp); 2163 return (error); 2164 } 2165 2166 error = zfs_aclset_common(zp, aclp, cr, &fuidp, tx); 2167 ASSERT(error == 0); 2168 2169 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2170 2171 if (fuidp) 2172 zfs_fuid_info_free(fuidp); 2173 zfs_acl_free(aclp); 2174 dmu_tx_commit(tx); 2175 done: 2176 mutex_exit(&zp->z_acl_lock); 2177 mutex_exit(&zp->z_lock); 2178 2179 return (error); 2180 } 2181 2182 /* 2183 * working_mode returns the permissions that were not granted 2184 */ 2185 static int 2186 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2187 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr) 2188 { 2189 zfs_acl_t *aclp; 2190 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2191 int error; 2192 uid_t uid = crgetuid(cr); 2193 uint64_t who; 2194 uint16_t type, iflags; 2195 uint16_t entry_type; 2196 uint32_t access_mask; 2197 uint32_t deny_mask = 0; 2198 zfs_ace_hdr_t *acep = NULL; 2199 boolean_t checkit; 2200 uid_t fowner; 2201 uid_t gowner; 2202 2203 /* 2204 * Short circuit empty requests 2205 */ 2206 if (v4_mode == 0) 2207 return (0); 2208 2209 *check_privs = B_TRUE; 2210 2211 if (zfsvfs->z_replay) { 2212 *working_mode = 0; 2213 return (0); 2214 } 2215 2216 *working_mode = v4_mode; 2217 2218 if ((v4_mode & WRITE_MASK) && 2219 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && 2220 (!IS_DEVVP(ZTOV(zp)))) { 2221 *check_privs = B_FALSE; 2222 return (EROFS); 2223 } 2224 2225 /* 2226 * Only check for READONLY on non-directories. 2227 */ 2228 if ((v4_mode & WRITE_MASK_DATA) && 2229 (((ZTOV(zp)->v_type != VDIR) && 2230 (zp->z_phys->zp_flags & (ZFS_READONLY | ZFS_IMMUTABLE))) || 2231 (ZTOV(zp)->v_type == VDIR && 2232 (zp->z_phys->zp_flags & ZFS_IMMUTABLE)))) { 2233 *check_privs = B_FALSE; 2234 return (EPERM); 2235 } 2236 2237 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2238 (zp->z_phys->zp_flags & ZFS_NOUNLINK)) { 2239 *check_privs = B_FALSE; 2240 return (EPERM); 2241 } 2242 2243 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2244 (zp->z_phys->zp_flags & ZFS_AV_QUARANTINED))) { 2245 *check_privs = B_FALSE; 2246 return (EACCES); 2247 } 2248 2249 /* 2250 * The caller requested that the ACL check be skipped. This 2251 * would only happen if the caller checked VOP_ACCESS() with a 2252 * 32 bit ACE mask and already had the appropriate permissions. 2253 */ 2254 if (skipaclchk) { 2255 *working_mode = 0; 2256 return (0); 2257 } 2258 2259 zfs_fuid_map_ids(zp, cr, &fowner, &gowner); 2260 2261 mutex_enter(&zp->z_acl_lock); 2262 2263 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 2264 if (error != 0) { 2265 mutex_exit(&zp->z_acl_lock); 2266 return (error); 2267 } 2268 2269 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2270 &iflags, &type)) { 2271 2272 if (!zfs_acl_valid_ace_type(type, iflags)) 2273 continue; 2274 2275 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE)) 2276 continue; 2277 2278 entry_type = (iflags & ACE_TYPE_FLAGS); 2279 2280 checkit = B_FALSE; 2281 2282 switch (entry_type) { 2283 case ACE_OWNER: 2284 if (uid == fowner) 2285 checkit = B_TRUE; 2286 break; 2287 case OWNING_GROUP: 2288 who = gowner; 2289 /*FALLTHROUGH*/ 2290 case ACE_IDENTIFIER_GROUP: 2291 checkit = zfs_groupmember(zfsvfs, who, cr); 2292 break; 2293 case ACE_EVERYONE: 2294 checkit = B_TRUE; 2295 break; 2296 2297 /* USER Entry */ 2298 default: 2299 if (entry_type == 0) { 2300 uid_t newid; 2301 2302 newid = zfs_fuid_map_id(zfsvfs, who, cr, 2303 ZFS_ACE_USER); 2304 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2305 uid == newid) 2306 checkit = B_TRUE; 2307 break; 2308 } else { 2309 zfs_acl_free(aclp); 2310 mutex_exit(&zp->z_acl_lock); 2311 return (EIO); 2312 } 2313 } 2314 2315 if (checkit) { 2316 uint32_t mask_matched = (access_mask & *working_mode); 2317 2318 if (mask_matched) { 2319 if (type == DENY) 2320 deny_mask |= mask_matched; 2321 2322 *working_mode &= ~mask_matched; 2323 } 2324 } 2325 2326 /* Are we done? */ 2327 if (*working_mode == 0) 2328 break; 2329 } 2330 2331 mutex_exit(&zp->z_acl_lock); 2332 zfs_acl_free(aclp); 2333 2334 /* Put the found 'denies' back on the working mode */ 2335 if (deny_mask) { 2336 *working_mode |= deny_mask; 2337 return (EACCES); 2338 } else if (*working_mode) { 2339 return (-1); 2340 } 2341 2342 return (0); 2343 } 2344 2345 static int 2346 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2347 cred_t *cr) 2348 { 2349 if (*working_mode != ACE_WRITE_DATA) 2350 return (EACCES); 2351 2352 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2353 check_privs, B_FALSE, cr)); 2354 } 2355 2356 /* 2357 * Determine whether Access should be granted/denied, invoking least 2358 * priv subsytem when a deny is determined. 2359 */ 2360 int 2361 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) 2362 { 2363 uint32_t working_mode; 2364 int error; 2365 int is_attr; 2366 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2367 boolean_t check_privs; 2368 znode_t *xzp; 2369 znode_t *check_zp = zp; 2370 2371 is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && 2372 (ZTOV(zp)->v_type == VDIR)); 2373 2374 /* 2375 * If attribute then validate against base file 2376 */ 2377 if (is_attr) { 2378 if ((error = zfs_zget(zp->z_zfsvfs, 2379 zp->z_phys->zp_parent, &xzp)) != 0) { 2380 return (error); 2381 } 2382 2383 check_zp = xzp; 2384 2385 /* 2386 * fixup mode to map to xattr perms 2387 */ 2388 2389 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2390 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2391 mode |= ACE_WRITE_NAMED_ATTRS; 2392 } 2393 2394 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2395 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2396 mode |= ACE_READ_NAMED_ATTRS; 2397 } 2398 } 2399 2400 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2401 &check_privs, skipaclchk, cr)) == 0) { 2402 if (is_attr) 2403 VN_RELE(ZTOV(xzp)); 2404 return (0); 2405 } 2406 2407 if (error && !check_privs) { 2408 if (is_attr) 2409 VN_RELE(ZTOV(xzp)); 2410 return (error); 2411 } 2412 2413 if (error && (flags & V_APPEND)) { 2414 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr); 2415 } 2416 2417 if (error && check_privs) { 2418 uid_t owner; 2419 mode_t checkmode = 0; 2420 2421 owner = zfs_fuid_map_id(zfsvfs, check_zp->z_phys->zp_uid, cr, 2422 ZFS_OWNER); 2423 2424 /* 2425 * First check for implicit owner permission on 2426 * read_acl/read_attributes 2427 */ 2428 2429 error = 0; 2430 ASSERT(working_mode != 0); 2431 2432 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2433 owner == crgetuid(cr))) 2434 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2435 2436 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2437 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE)) 2438 checkmode |= VREAD; 2439 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2440 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE)) 2441 checkmode |= VWRITE; 2442 if (working_mode & ACE_EXECUTE) 2443 checkmode |= VEXEC; 2444 2445 if (checkmode) 2446 error = secpolicy_vnode_access(cr, ZTOV(check_zp), 2447 owner, checkmode); 2448 2449 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2450 error = secpolicy_vnode_chown(cr, B_TRUE); 2451 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2452 error = secpolicy_vnode_setdac(cr, owner); 2453 2454 if (error == 0 && (working_mode & 2455 (ACE_DELETE|ACE_DELETE_CHILD))) 2456 error = secpolicy_vnode_remove(cr); 2457 2458 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) { 2459 error = secpolicy_vnode_chown(cr, B_FALSE); 2460 } 2461 if (error == 0) { 2462 /* 2463 * See if any bits other than those already checked 2464 * for are still present. If so then return EACCES 2465 */ 2466 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2467 error = EACCES; 2468 } 2469 } 2470 } 2471 2472 if (is_attr) 2473 VN_RELE(ZTOV(xzp)); 2474 2475 return (error); 2476 } 2477 2478 /* 2479 * Translate traditional unix VREAD/VWRITE/VEXEC mode into 2480 * native ACL format and call zfs_zaccess() 2481 */ 2482 int 2483 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr) 2484 { 2485 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr)); 2486 } 2487 2488 /* 2489 * Access function for secpolicy_vnode_setattr 2490 */ 2491 int 2492 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr) 2493 { 2494 int v4_mode = zfs_unix_to_v4(mode >> 6); 2495 2496 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr)); 2497 } 2498 2499 static int 2500 zfs_delete_final_check(znode_t *zp, znode_t *dzp, 2501 mode_t missing_perms, cred_t *cr) 2502 { 2503 int error; 2504 uid_t downer; 2505 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2506 2507 downer = zfs_fuid_map_id(zfsvfs, dzp->z_phys->zp_uid, cr, ZFS_OWNER); 2508 2509 error = secpolicy_vnode_access(cr, ZTOV(dzp), downer, missing_perms); 2510 2511 if (error == 0) 2512 error = zfs_sticky_remove_access(dzp, zp, cr); 2513 2514 return (error); 2515 } 2516 2517 /* 2518 * Determine whether Access should be granted/deny, without 2519 * consulting least priv subsystem. 2520 * 2521 * 2522 * The following chart is the recommended NFSv4 enforcement for 2523 * ability to delete an object. 2524 * 2525 * ------------------------------------------------------- 2526 * | Parent Dir | Target Object Permissions | 2527 * | permissions | | 2528 * ------------------------------------------------------- 2529 * | | ACL Allows | ACL Denies| Delete | 2530 * | | Delete | Delete | unspecified| 2531 * ------------------------------------------------------- 2532 * | ACL Allows | Permit | Permit | Permit | 2533 * | DELETE_CHILD | | 2534 * ------------------------------------------------------- 2535 * | ACL Denies | Permit | Deny | Deny | 2536 * | DELETE_CHILD | | | | 2537 * ------------------------------------------------------- 2538 * | ACL specifies | | | | 2539 * | only allow | Permit | Permit | Permit | 2540 * | write and | | | | 2541 * | execute | | | | 2542 * ------------------------------------------------------- 2543 * | ACL denies | | | | 2544 * | write and | Permit | Deny | Deny | 2545 * | execute | | | | 2546 * ------------------------------------------------------- 2547 * ^ 2548 * | 2549 * No search privilege, can't even look up file? 2550 * 2551 */ 2552 int 2553 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr) 2554 { 2555 uint32_t dzp_working_mode = 0; 2556 uint32_t zp_working_mode = 0; 2557 int dzp_error, zp_error; 2558 mode_t missing_perms; 2559 boolean_t dzpcheck_privs = B_TRUE; 2560 boolean_t zpcheck_privs = B_TRUE; 2561 2562 /* 2563 * We want specific DELETE permissions to 2564 * take precedence over WRITE/EXECUTE. We don't 2565 * want an ACL such as this to mess us up. 2566 * user:joe:write_data:deny,user:joe:delete:allow 2567 * 2568 * However, deny permissions may ultimately be overridden 2569 * by secpolicy_vnode_access(). 2570 * 2571 * We will ask for all of the necessary permissions and then 2572 * look at the working modes from the directory and target object 2573 * to determine what was found. 2574 */ 2575 2576 if (zp->z_phys->zp_flags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2577 return (EPERM); 2578 2579 /* 2580 * First row 2581 * If the directory permissions allow the delete, we are done. 2582 */ 2583 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD, 2584 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2585 return (0); 2586 2587 /* 2588 * If target object has delete permission then we are done 2589 */ 2590 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2591 &zpcheck_privs, B_FALSE, cr)) == 0) 2592 return (0); 2593 2594 ASSERT(dzp_error && zp_error); 2595 2596 if (!dzpcheck_privs) 2597 return (dzp_error); 2598 if (!zpcheck_privs) 2599 return (zp_error); 2600 2601 /* 2602 * Second row 2603 * 2604 * If directory returns EACCES then delete_child was denied 2605 * due to deny delete_child. In this case send the request through 2606 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check() 2607 * since that *could* allow the delete based on write/execute permission 2608 * and we want delete permissions to override write/execute. 2609 */ 2610 2611 if (dzp_error == EACCES) 2612 return (secpolicy_vnode_remove(cr)); 2613 2614 /* 2615 * Third Row 2616 * only need to see if we have write/execute on directory. 2617 */ 2618 2619 if ((dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA, 2620 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0) 2621 return (zfs_sticky_remove_access(dzp, zp, cr)); 2622 2623 if (!dzpcheck_privs) 2624 return (dzp_error); 2625 2626 /* 2627 * Fourth row 2628 */ 2629 2630 missing_perms = (dzp_working_mode & ACE_WRITE_DATA) ? VWRITE : 0; 2631 missing_perms |= (dzp_working_mode & ACE_EXECUTE) ? VEXEC : 0; 2632 2633 ASSERT(missing_perms); 2634 2635 return (zfs_delete_final_check(zp, dzp, missing_perms, cr)); 2636 2637 } 2638 2639 int 2640 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2641 znode_t *tzp, cred_t *cr) 2642 { 2643 int add_perm; 2644 int error; 2645 2646 if (szp->z_phys->zp_flags & ZFS_AV_QUARANTINED) 2647 return (EACCES); 2648 2649 add_perm = (ZTOV(szp)->v_type == VDIR) ? 2650 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 2651 2652 /* 2653 * Rename permissions are combination of delete permission + 2654 * add file/subdir permission. 2655 */ 2656 2657 /* 2658 * first make sure we do the delete portion. 2659 * 2660 * If that succeeds then check for add_file/add_subdir permissions 2661 */ 2662 2663 if (error = zfs_zaccess_delete(sdzp, szp, cr)) 2664 return (error); 2665 2666 /* 2667 * If we have a tzp, see if we can delete it? 2668 */ 2669 if (tzp) { 2670 if (error = zfs_zaccess_delete(tdzp, tzp, cr)) 2671 return (error); 2672 } 2673 2674 /* 2675 * Now check for add permissions 2676 */ 2677 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr); 2678 2679 return (error); 2680 } 2681