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 https://opensource.org/licenses/CDDL-1.0. 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2013 by Delphix. All rights reserved. 24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved. 25 */ 26 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/sysmacros.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/fs/zfs.h> 41 #include <sys/policy.h> 42 #include <sys/zfs_znode.h> 43 #include <sys/zfs_fuid.h> 44 #include <sys/zfs_acl.h> 45 #include <sys/zfs_dir.h> 46 #include <sys/zfs_quota.h> 47 #include <sys/zfs_vfsops.h> 48 #include <sys/dmu.h> 49 #include <sys/dnode.h> 50 #include <sys/zap.h> 51 #include <sys/sa.h> 52 #include <sys/trace_acl.h> 53 #include <sys/zpl.h> 54 55 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE 56 #define DENY ACE_ACCESS_DENIED_ACE_TYPE 57 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 58 #define MIN_ACE_TYPE ALLOW 59 60 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP) 61 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \ 62 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE) 63 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \ 64 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 65 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \ 66 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 67 68 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \ 69 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \ 70 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \ 71 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE) 72 73 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS) 74 #define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \ 75 ACE_DELETE|ACE_DELETE_CHILD) 76 #define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS) 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 #define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH) 96 97 #define IDMAP_WK_CREATOR_OWNER_UID 2147483648U 98 99 static uint16_t 100 zfs_ace_v0_get_type(void *acep) 101 { 102 return (((zfs_oldace_t *)acep)->z_type); 103 } 104 105 static uint16_t 106 zfs_ace_v0_get_flags(void *acep) 107 { 108 return (((zfs_oldace_t *)acep)->z_flags); 109 } 110 111 static uint32_t 112 zfs_ace_v0_get_mask(void *acep) 113 { 114 return (((zfs_oldace_t *)acep)->z_access_mask); 115 } 116 117 static uint64_t 118 zfs_ace_v0_get_who(void *acep) 119 { 120 return (((zfs_oldace_t *)acep)->z_fuid); 121 } 122 123 static void 124 zfs_ace_v0_set_type(void *acep, uint16_t type) 125 { 126 ((zfs_oldace_t *)acep)->z_type = type; 127 } 128 129 static void 130 zfs_ace_v0_set_flags(void *acep, uint16_t flags) 131 { 132 ((zfs_oldace_t *)acep)->z_flags = flags; 133 } 134 135 static void 136 zfs_ace_v0_set_mask(void *acep, uint32_t mask) 137 { 138 ((zfs_oldace_t *)acep)->z_access_mask = mask; 139 } 140 141 static void 142 zfs_ace_v0_set_who(void *acep, uint64_t who) 143 { 144 ((zfs_oldace_t *)acep)->z_fuid = who; 145 } 146 147 static size_t 148 zfs_ace_v0_size(void *acep) 149 { 150 (void) acep; 151 return (sizeof (zfs_oldace_t)); 152 } 153 154 static size_t 155 zfs_ace_v0_abstract_size(void) 156 { 157 return (sizeof (zfs_oldace_t)); 158 } 159 160 static int 161 zfs_ace_v0_mask_off(void) 162 { 163 return (offsetof(zfs_oldace_t, z_access_mask)); 164 } 165 166 static int 167 zfs_ace_v0_data(void *acep, void **datap) 168 { 169 (void) acep; 170 *datap = NULL; 171 return (0); 172 } 173 174 static const acl_ops_t zfs_acl_v0_ops = { 175 .ace_mask_get = zfs_ace_v0_get_mask, 176 .ace_mask_set = zfs_ace_v0_set_mask, 177 .ace_flags_get = zfs_ace_v0_get_flags, 178 .ace_flags_set = zfs_ace_v0_set_flags, 179 .ace_type_get = zfs_ace_v0_get_type, 180 .ace_type_set = zfs_ace_v0_set_type, 181 .ace_who_get = zfs_ace_v0_get_who, 182 .ace_who_set = zfs_ace_v0_set_who, 183 .ace_size = zfs_ace_v0_size, 184 .ace_abstract_size = zfs_ace_v0_abstract_size, 185 .ace_mask_off = zfs_ace_v0_mask_off, 186 .ace_data = zfs_ace_v0_data 187 }; 188 189 static uint16_t 190 zfs_ace_fuid_get_type(void *acep) 191 { 192 return (((zfs_ace_hdr_t *)acep)->z_type); 193 } 194 195 static uint16_t 196 zfs_ace_fuid_get_flags(void *acep) 197 { 198 return (((zfs_ace_hdr_t *)acep)->z_flags); 199 } 200 201 static uint32_t 202 zfs_ace_fuid_get_mask(void *acep) 203 { 204 return (((zfs_ace_hdr_t *)acep)->z_access_mask); 205 } 206 207 static uint64_t 208 zfs_ace_fuid_get_who(void *args) 209 { 210 uint16_t entry_type; 211 zfs_ace_t *acep = args; 212 213 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 214 215 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 216 entry_type == ACE_EVERYONE) 217 return (-1); 218 return (((zfs_ace_t *)acep)->z_fuid); 219 } 220 221 static void 222 zfs_ace_fuid_set_type(void *acep, uint16_t type) 223 { 224 ((zfs_ace_hdr_t *)acep)->z_type = type; 225 } 226 227 static void 228 zfs_ace_fuid_set_flags(void *acep, uint16_t flags) 229 { 230 ((zfs_ace_hdr_t *)acep)->z_flags = flags; 231 } 232 233 static void 234 zfs_ace_fuid_set_mask(void *acep, uint32_t mask) 235 { 236 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask; 237 } 238 239 static void 240 zfs_ace_fuid_set_who(void *arg, uint64_t who) 241 { 242 zfs_ace_t *acep = arg; 243 244 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 245 246 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 247 entry_type == ACE_EVERYONE) 248 return; 249 acep->z_fuid = who; 250 } 251 252 static size_t 253 zfs_ace_fuid_size(void *acep) 254 { 255 zfs_ace_hdr_t *zacep = acep; 256 uint16_t entry_type; 257 258 switch (zacep->z_type) { 259 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 260 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 261 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 262 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 263 return (sizeof (zfs_object_ace_t)); 264 case ALLOW: 265 case DENY: 266 entry_type = 267 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS); 268 if (entry_type == ACE_OWNER || 269 entry_type == OWNING_GROUP || 270 entry_type == ACE_EVERYONE) 271 return (sizeof (zfs_ace_hdr_t)); 272 zfs_fallthrough; 273 default: 274 return (sizeof (zfs_ace_t)); 275 } 276 } 277 278 static size_t 279 zfs_ace_fuid_abstract_size(void) 280 { 281 return (sizeof (zfs_ace_hdr_t)); 282 } 283 284 static int 285 zfs_ace_fuid_mask_off(void) 286 { 287 return (offsetof(zfs_ace_hdr_t, z_access_mask)); 288 } 289 290 static int 291 zfs_ace_fuid_data(void *acep, void **datap) 292 { 293 zfs_ace_t *zacep = acep; 294 zfs_object_ace_t *zobjp; 295 296 switch (zacep->z_hdr.z_type) { 297 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 298 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 299 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 300 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 301 zobjp = acep; 302 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t); 303 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t)); 304 default: 305 *datap = NULL; 306 return (0); 307 } 308 } 309 310 static const acl_ops_t zfs_acl_fuid_ops = { 311 .ace_mask_get = zfs_ace_fuid_get_mask, 312 .ace_mask_set = zfs_ace_fuid_set_mask, 313 .ace_flags_get = zfs_ace_fuid_get_flags, 314 .ace_flags_set = zfs_ace_fuid_set_flags, 315 .ace_type_get = zfs_ace_fuid_get_type, 316 .ace_type_set = zfs_ace_fuid_set_type, 317 .ace_who_get = zfs_ace_fuid_get_who, 318 .ace_who_set = zfs_ace_fuid_set_who, 319 .ace_size = zfs_ace_fuid_size, 320 .ace_abstract_size = zfs_ace_fuid_abstract_size, 321 .ace_mask_off = zfs_ace_fuid_mask_off, 322 .ace_data = zfs_ace_fuid_data 323 }; 324 325 /* 326 * The following three functions are provided for compatibility with 327 * older ZPL version in order to determine if the file use to have 328 * an external ACL and what version of ACL previously existed on the 329 * file. Would really be nice to not need this, sigh. 330 */ 331 uint64_t 332 zfs_external_acl(znode_t *zp) 333 { 334 zfs_acl_phys_t acl_phys; 335 int error; 336 337 if (zp->z_is_sa) 338 return (0); 339 340 /* 341 * Need to deal with a potential 342 * race where zfs_sa_upgrade could cause 343 * z_isa_sa to change. 344 * 345 * If the lookup fails then the state of z_is_sa should have 346 * changed. 347 */ 348 349 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(ZTOZSB(zp)), 350 &acl_phys, sizeof (acl_phys))) == 0) 351 return (acl_phys.z_acl_extern_obj); 352 else { 353 /* 354 * after upgrade the SA_ZPL_ZNODE_ACL should have been 355 * removed 356 */ 357 VERIFY(zp->z_is_sa && error == ENOENT); 358 return (0); 359 } 360 } 361 362 /* 363 * Determine size of ACL in bytes 364 * 365 * This is more complicated than it should be since we have to deal 366 * with old external ACLs. 367 */ 368 static int 369 zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount, 370 zfs_acl_phys_t *aclphys) 371 { 372 zfsvfs_t *zfsvfs = ZTOZSB(zp); 373 uint64_t acl_count; 374 int size; 375 int error; 376 377 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 378 if (zp->z_is_sa) { 379 if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zfsvfs), 380 &size)) != 0) 381 return (error); 382 *aclsize = size; 383 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs), 384 &acl_count, sizeof (acl_count))) != 0) 385 return (error); 386 *aclcount = acl_count; 387 } else { 388 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs), 389 aclphys, sizeof (*aclphys))) != 0) 390 return (error); 391 392 if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) { 393 *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size); 394 *aclcount = aclphys->z_acl_size; 395 } else { 396 *aclsize = aclphys->z_acl_size; 397 *aclcount = aclphys->z_acl_count; 398 } 399 } 400 return (0); 401 } 402 403 int 404 zfs_znode_acl_version(znode_t *zp) 405 { 406 zfs_acl_phys_t acl_phys; 407 408 if (zp->z_is_sa) 409 return (ZFS_ACL_VERSION_FUID); 410 else { 411 int error; 412 413 /* 414 * Need to deal with a potential 415 * race where zfs_sa_upgrade could cause 416 * z_isa_sa to change. 417 * 418 * If the lookup fails then the state of z_is_sa should have 419 * changed. 420 */ 421 if ((error = sa_lookup(zp->z_sa_hdl, 422 SA_ZPL_ZNODE_ACL(ZTOZSB(zp)), 423 &acl_phys, sizeof (acl_phys))) == 0) 424 return (acl_phys.z_acl_version); 425 else { 426 /* 427 * After upgrade SA_ZPL_ZNODE_ACL should have 428 * been removed. 429 */ 430 VERIFY(zp->z_is_sa && error == ENOENT); 431 return (ZFS_ACL_VERSION_FUID); 432 } 433 } 434 } 435 436 static int 437 zfs_acl_version(int version) 438 { 439 if (version < ZPL_VERSION_FUID) 440 return (ZFS_ACL_VERSION_INITIAL); 441 else 442 return (ZFS_ACL_VERSION_FUID); 443 } 444 445 static int 446 zfs_acl_version_zp(znode_t *zp) 447 { 448 return (zfs_acl_version(ZTOZSB(zp)->z_version)); 449 } 450 451 zfs_acl_t * 452 zfs_acl_alloc(int vers) 453 { 454 zfs_acl_t *aclp; 455 456 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP); 457 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t), 458 offsetof(zfs_acl_node_t, z_next)); 459 aclp->z_version = vers; 460 if (vers == ZFS_ACL_VERSION_FUID) 461 aclp->z_ops = &zfs_acl_fuid_ops; 462 else 463 aclp->z_ops = &zfs_acl_v0_ops; 464 return (aclp); 465 } 466 467 zfs_acl_node_t * 468 zfs_acl_node_alloc(size_t bytes) 469 { 470 zfs_acl_node_t *aclnode; 471 472 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP); 473 if (bytes) { 474 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP); 475 aclnode->z_allocdata = aclnode->z_acldata; 476 aclnode->z_allocsize = bytes; 477 aclnode->z_size = bytes; 478 } 479 480 return (aclnode); 481 } 482 483 static void 484 zfs_acl_node_free(zfs_acl_node_t *aclnode) 485 { 486 if (aclnode->z_allocsize) 487 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize); 488 kmem_free(aclnode, sizeof (zfs_acl_node_t)); 489 } 490 491 static void 492 zfs_acl_release_nodes(zfs_acl_t *aclp) 493 { 494 zfs_acl_node_t *aclnode; 495 496 while ((aclnode = list_remove_head(&aclp->z_acl))) 497 zfs_acl_node_free(aclnode); 498 aclp->z_acl_count = 0; 499 aclp->z_acl_bytes = 0; 500 } 501 502 void 503 zfs_acl_free(zfs_acl_t *aclp) 504 { 505 zfs_acl_release_nodes(aclp); 506 list_destroy(&aclp->z_acl); 507 kmem_free(aclp, sizeof (zfs_acl_t)); 508 } 509 510 static boolean_t 511 zfs_acl_valid_ace_type(uint_t type, uint_t flags) 512 { 513 uint16_t entry_type; 514 515 switch (type) { 516 case ALLOW: 517 case DENY: 518 case ACE_SYSTEM_AUDIT_ACE_TYPE: 519 case ACE_SYSTEM_ALARM_ACE_TYPE: 520 entry_type = flags & ACE_TYPE_FLAGS; 521 return (entry_type == ACE_OWNER || 522 entry_type == OWNING_GROUP || 523 entry_type == ACE_EVERYONE || entry_type == 0 || 524 entry_type == ACE_IDENTIFIER_GROUP); 525 default: 526 if (type <= MAX_ACE_TYPE) 527 return (B_TRUE); 528 } 529 return (B_FALSE); 530 } 531 532 static boolean_t 533 zfs_ace_valid(umode_t obj_mode, zfs_acl_t *aclp, uint16_t type, uint16_t iflags) 534 { 535 /* 536 * first check type of entry 537 */ 538 539 if (!zfs_acl_valid_ace_type(type, iflags)) 540 return (B_FALSE); 541 542 switch (type) { 543 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 544 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 545 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 546 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 547 if (aclp->z_version < ZFS_ACL_VERSION_FUID) 548 return (B_FALSE); 549 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 550 } 551 552 /* 553 * next check inheritance level flags 554 */ 555 556 if (S_ISDIR(obj_mode) && 557 (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE))) 558 aclp->z_hints |= ZFS_INHERIT_ACE; 559 560 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) { 561 if ((iflags & (ACE_FILE_INHERIT_ACE| 562 ACE_DIRECTORY_INHERIT_ACE)) == 0) { 563 return (B_FALSE); 564 } 565 } 566 567 return (B_TRUE); 568 } 569 570 static void * 571 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who, 572 uint32_t *access_mask, uint16_t *iflags, uint16_t *type) 573 { 574 zfs_acl_node_t *aclnode; 575 576 ASSERT(aclp); 577 578 if (start == NULL) { 579 aclnode = list_head(&aclp->z_acl); 580 if (aclnode == NULL) 581 return (NULL); 582 583 aclp->z_next_ace = aclnode->z_acldata; 584 aclp->z_curr_node = aclnode; 585 aclnode->z_ace_idx = 0; 586 } 587 588 aclnode = aclp->z_curr_node; 589 590 if (aclnode == NULL) 591 return (NULL); 592 593 if (aclnode->z_ace_idx >= aclnode->z_ace_count) { 594 aclnode = list_next(&aclp->z_acl, aclnode); 595 if (aclnode == NULL) 596 return (NULL); 597 else { 598 aclp->z_curr_node = aclnode; 599 aclnode->z_ace_idx = 0; 600 aclp->z_next_ace = aclnode->z_acldata; 601 } 602 } 603 604 if (aclnode->z_ace_idx < aclnode->z_ace_count) { 605 void *acep = aclp->z_next_ace; 606 size_t ace_size; 607 608 /* 609 * Make sure we don't overstep our bounds 610 */ 611 ace_size = aclp->z_ops->ace_size(acep); 612 613 if (((caddr_t)acep + ace_size) > 614 ((caddr_t)aclnode->z_acldata + aclnode->z_size)) { 615 return (NULL); 616 } 617 618 *iflags = aclp->z_ops->ace_flags_get(acep); 619 *type = aclp->z_ops->ace_type_get(acep); 620 *access_mask = aclp->z_ops->ace_mask_get(acep); 621 *who = aclp->z_ops->ace_who_get(acep); 622 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size; 623 aclnode->z_ace_idx++; 624 625 return ((void *)acep); 626 } 627 return (NULL); 628 } 629 630 static uintptr_t 631 zfs_ace_walk(void *datap, uintptr_t cookie, int aclcnt, 632 uint16_t *flags, uint16_t *type, uint32_t *mask) 633 { 634 (void) aclcnt; 635 zfs_acl_t *aclp = datap; 636 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)cookie; 637 uint64_t who; 638 639 acep = zfs_acl_next_ace(aclp, acep, &who, mask, 640 flags, type); 641 return ((uintptr_t)acep); 642 } 643 644 /* 645 * Copy ACE to internal ZFS format. 646 * While processing the ACL each ACE will be validated for correctness. 647 * ACE FUIDs will be created later. 648 */ 649 static int 650 zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, umode_t obj_mode, zfs_acl_t *aclp, 651 void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size, 652 zfs_fuid_info_t **fuidp, cred_t *cr) 653 { 654 int i; 655 uint16_t entry_type; 656 zfs_ace_t *aceptr = z_acl; 657 ace_t *acep = datap; 658 zfs_object_ace_t *zobjacep; 659 ace_object_t *aceobjp; 660 661 for (i = 0; i != aclcnt; i++) { 662 aceptr->z_hdr.z_access_mask = acep->a_access_mask; 663 aceptr->z_hdr.z_flags = acep->a_flags; 664 aceptr->z_hdr.z_type = acep->a_type; 665 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS; 666 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP && 667 entry_type != ACE_EVERYONE) { 668 aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who, 669 cr, (entry_type == 0) ? 670 ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp); 671 } 672 673 /* 674 * Make sure ACE is valid 675 */ 676 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_hdr.z_type, 677 aceptr->z_hdr.z_flags) != B_TRUE) 678 return (SET_ERROR(EINVAL)); 679 680 switch (acep->a_type) { 681 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 682 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 683 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 684 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 685 zobjacep = (zfs_object_ace_t *)aceptr; 686 aceobjp = (ace_object_t *)acep; 687 688 memcpy(zobjacep->z_object_type, aceobjp->a_obj_type, 689 sizeof (aceobjp->a_obj_type)); 690 memcpy(zobjacep->z_inherit_type, 691 aceobjp->a_inherit_obj_type, 692 sizeof (aceobjp->a_inherit_obj_type)); 693 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t)); 694 break; 695 default: 696 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t)); 697 } 698 699 aceptr = (zfs_ace_t *)((caddr_t)aceptr + 700 aclp->z_ops->ace_size(aceptr)); 701 } 702 703 *size = (caddr_t)aceptr - (caddr_t)z_acl; 704 705 return (0); 706 } 707 708 /* 709 * Copy ZFS ACEs to fixed size ace_t layout 710 */ 711 static void 712 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr, 713 void *datap, int filter) 714 { 715 uint64_t who; 716 uint32_t access_mask; 717 uint16_t iflags, type; 718 zfs_ace_hdr_t *zacep = NULL; 719 ace_t *acep = datap; 720 ace_object_t *objacep; 721 zfs_object_ace_t *zobjacep; 722 size_t ace_size; 723 uint16_t entry_type; 724 725 while ((zacep = zfs_acl_next_ace(aclp, zacep, 726 &who, &access_mask, &iflags, &type))) { 727 728 switch (type) { 729 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 730 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 731 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 732 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 733 if (filter) { 734 continue; 735 } 736 zobjacep = (zfs_object_ace_t *)zacep; 737 objacep = (ace_object_t *)acep; 738 memcpy(objacep->a_obj_type, 739 zobjacep->z_object_type, 740 sizeof (zobjacep->z_object_type)); 741 memcpy(objacep->a_inherit_obj_type, 742 zobjacep->z_inherit_type, 743 sizeof (zobjacep->z_inherit_type)); 744 ace_size = sizeof (ace_object_t); 745 break; 746 default: 747 ace_size = sizeof (ace_t); 748 break; 749 } 750 751 entry_type = (iflags & ACE_TYPE_FLAGS); 752 if ((entry_type != ACE_OWNER && 753 entry_type != OWNING_GROUP && 754 entry_type != ACE_EVERYONE)) { 755 acep->a_who = zfs_fuid_map_id(zfsvfs, who, 756 cr, (entry_type & ACE_IDENTIFIER_GROUP) ? 757 ZFS_ACE_GROUP : ZFS_ACE_USER); 758 } else { 759 acep->a_who = (uid_t)(int64_t)who; 760 } 761 acep->a_access_mask = access_mask; 762 acep->a_flags = iflags; 763 acep->a_type = type; 764 acep = (ace_t *)((caddr_t)acep + ace_size); 765 } 766 } 767 768 static int 769 zfs_copy_ace_2_oldace(umode_t obj_mode, zfs_acl_t *aclp, ace_t *acep, 770 zfs_oldace_t *z_acl, int aclcnt, size_t *size) 771 { 772 int i; 773 zfs_oldace_t *aceptr = z_acl; 774 775 for (i = 0; i != aclcnt; i++, aceptr++) { 776 aceptr->z_access_mask = acep[i].a_access_mask; 777 aceptr->z_type = acep[i].a_type; 778 aceptr->z_flags = acep[i].a_flags; 779 aceptr->z_fuid = acep[i].a_who; 780 /* 781 * Make sure ACE is valid 782 */ 783 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_type, 784 aceptr->z_flags) != B_TRUE) 785 return (SET_ERROR(EINVAL)); 786 } 787 *size = (caddr_t)aceptr - (caddr_t)z_acl; 788 return (0); 789 } 790 791 /* 792 * convert old ACL format to new 793 */ 794 void 795 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr) 796 { 797 zfs_oldace_t *oldaclp; 798 int i; 799 uint16_t type, iflags; 800 uint32_t access_mask; 801 uint64_t who; 802 void *cookie = NULL; 803 zfs_acl_node_t *newaclnode; 804 805 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL); 806 /* 807 * First create the ACE in a contiguous piece of memory 808 * for zfs_copy_ace_2_fuid(). 809 * 810 * We only convert an ACL once, so this won't happen 811 * every time. 812 */ 813 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count, 814 KM_SLEEP); 815 i = 0; 816 while ((cookie = zfs_acl_next_ace(aclp, cookie, &who, 817 &access_mask, &iflags, &type))) { 818 oldaclp[i].z_flags = iflags; 819 oldaclp[i].z_type = type; 820 oldaclp[i].z_fuid = who; 821 oldaclp[i++].z_access_mask = access_mask; 822 } 823 824 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count * 825 sizeof (zfs_object_ace_t)); 826 aclp->z_ops = &zfs_acl_fuid_ops; 827 VERIFY(zfs_copy_ace_2_fuid(ZTOZSB(zp), ZTOI(zp)->i_mode, 828 aclp, oldaclp, newaclnode->z_acldata, aclp->z_acl_count, 829 &newaclnode->z_size, NULL, cr) == 0); 830 newaclnode->z_ace_count = aclp->z_acl_count; 831 aclp->z_version = ZFS_ACL_VERSION; 832 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t)); 833 834 /* 835 * Release all previous ACL nodes 836 */ 837 838 zfs_acl_release_nodes(aclp); 839 840 list_insert_head(&aclp->z_acl, newaclnode); 841 842 aclp->z_acl_bytes = newaclnode->z_size; 843 aclp->z_acl_count = newaclnode->z_ace_count; 844 845 } 846 847 /* 848 * Convert unix access mask to v4 access mask 849 */ 850 static uint32_t 851 zfs_unix_to_v4(uint32_t access_mask) 852 { 853 uint32_t new_mask = 0; 854 855 if (access_mask & S_IXOTH) 856 new_mask |= ACE_EXECUTE; 857 if (access_mask & S_IWOTH) 858 new_mask |= ACE_WRITE_DATA; 859 if (access_mask & S_IROTH) 860 new_mask |= ACE_READ_DATA; 861 return (new_mask); 862 } 863 864 865 static int 866 zfs_v4_to_unix(uint32_t access_mask, int *unmapped) 867 { 868 int new_mask = 0; 869 870 *unmapped = access_mask & 871 (ACE_WRITE_OWNER | ACE_WRITE_ACL | ACE_DELETE); 872 873 if (access_mask & WRITE_MASK) 874 new_mask |= S_IWOTH; 875 if (access_mask & ACE_READ_DATA) 876 new_mask |= S_IROTH; 877 if (access_mask & ACE_EXECUTE) 878 new_mask |= S_IXOTH; 879 880 return (new_mask); 881 } 882 883 884 static void 885 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask, 886 uint16_t access_type, uint64_t fuid, uint16_t entry_type) 887 { 888 uint16_t type = entry_type & ACE_TYPE_FLAGS; 889 890 aclp->z_ops->ace_mask_set(acep, access_mask); 891 aclp->z_ops->ace_type_set(acep, access_type); 892 aclp->z_ops->ace_flags_set(acep, entry_type); 893 if ((type != ACE_OWNER && type != OWNING_GROUP && 894 type != ACE_EVERYONE)) 895 aclp->z_ops->ace_who_set(acep, fuid); 896 } 897 898 /* 899 * Determine mode of file based on ACL. 900 */ 901 uint64_t 902 zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp, 903 uint64_t *pflags, uint64_t fuid, uint64_t fgid) 904 { 905 int entry_type; 906 mode_t mode; 907 mode_t seen = 0; 908 zfs_ace_hdr_t *acep = NULL; 909 uint64_t who; 910 uint16_t iflags, type; 911 uint32_t access_mask; 912 boolean_t an_exec_denied = B_FALSE; 913 914 mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX)); 915 916 while ((acep = zfs_acl_next_ace(aclp, acep, &who, 917 &access_mask, &iflags, &type))) { 918 919 if (!zfs_acl_valid_ace_type(type, iflags)) 920 continue; 921 922 entry_type = (iflags & ACE_TYPE_FLAGS); 923 924 /* 925 * Skip over any inherit_only ACEs 926 */ 927 if (iflags & ACE_INHERIT_ONLY_ACE) 928 continue; 929 930 if (entry_type == ACE_OWNER || (entry_type == 0 && 931 who == fuid)) { 932 if ((access_mask & ACE_READ_DATA) && 933 (!(seen & S_IRUSR))) { 934 seen |= S_IRUSR; 935 if (type == ALLOW) { 936 mode |= S_IRUSR; 937 } 938 } 939 if ((access_mask & ACE_WRITE_DATA) && 940 (!(seen & S_IWUSR))) { 941 seen |= S_IWUSR; 942 if (type == ALLOW) { 943 mode |= S_IWUSR; 944 } 945 } 946 if ((access_mask & ACE_EXECUTE) && 947 (!(seen & S_IXUSR))) { 948 seen |= S_IXUSR; 949 if (type == ALLOW) { 950 mode |= S_IXUSR; 951 } 952 } 953 } else if (entry_type == OWNING_GROUP || 954 (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) { 955 if ((access_mask & ACE_READ_DATA) && 956 (!(seen & S_IRGRP))) { 957 seen |= S_IRGRP; 958 if (type == ALLOW) { 959 mode |= S_IRGRP; 960 } 961 } 962 if ((access_mask & ACE_WRITE_DATA) && 963 (!(seen & S_IWGRP))) { 964 seen |= S_IWGRP; 965 if (type == ALLOW) { 966 mode |= S_IWGRP; 967 } 968 } 969 if ((access_mask & ACE_EXECUTE) && 970 (!(seen & S_IXGRP))) { 971 seen |= S_IXGRP; 972 if (type == ALLOW) { 973 mode |= S_IXGRP; 974 } 975 } 976 } else if (entry_type == ACE_EVERYONE) { 977 if ((access_mask & ACE_READ_DATA)) { 978 if (!(seen & S_IRUSR)) { 979 seen |= S_IRUSR; 980 if (type == ALLOW) { 981 mode |= S_IRUSR; 982 } 983 } 984 if (!(seen & S_IRGRP)) { 985 seen |= S_IRGRP; 986 if (type == ALLOW) { 987 mode |= S_IRGRP; 988 } 989 } 990 if (!(seen & S_IROTH)) { 991 seen |= S_IROTH; 992 if (type == ALLOW) { 993 mode |= S_IROTH; 994 } 995 } 996 } 997 if ((access_mask & ACE_WRITE_DATA)) { 998 if (!(seen & S_IWUSR)) { 999 seen |= S_IWUSR; 1000 if (type == ALLOW) { 1001 mode |= S_IWUSR; 1002 } 1003 } 1004 if (!(seen & S_IWGRP)) { 1005 seen |= S_IWGRP; 1006 if (type == ALLOW) { 1007 mode |= S_IWGRP; 1008 } 1009 } 1010 if (!(seen & S_IWOTH)) { 1011 seen |= S_IWOTH; 1012 if (type == ALLOW) { 1013 mode |= S_IWOTH; 1014 } 1015 } 1016 } 1017 if ((access_mask & ACE_EXECUTE)) { 1018 if (!(seen & S_IXUSR)) { 1019 seen |= S_IXUSR; 1020 if (type == ALLOW) { 1021 mode |= S_IXUSR; 1022 } 1023 } 1024 if (!(seen & S_IXGRP)) { 1025 seen |= S_IXGRP; 1026 if (type == ALLOW) { 1027 mode |= S_IXGRP; 1028 } 1029 } 1030 if (!(seen & S_IXOTH)) { 1031 seen |= S_IXOTH; 1032 if (type == ALLOW) { 1033 mode |= S_IXOTH; 1034 } 1035 } 1036 } 1037 } else { 1038 /* 1039 * Only care if this IDENTIFIER_GROUP or 1040 * USER ACE denies execute access to someone, 1041 * mode is not affected 1042 */ 1043 if ((access_mask & ACE_EXECUTE) && type == DENY) 1044 an_exec_denied = B_TRUE; 1045 } 1046 } 1047 1048 /* 1049 * Failure to allow is effectively a deny, so execute permission 1050 * is denied if it was never mentioned or if we explicitly 1051 * weren't allowed it. 1052 */ 1053 if (!an_exec_denied && 1054 ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS || 1055 (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS)) 1056 an_exec_denied = B_TRUE; 1057 1058 if (an_exec_denied) 1059 *pflags &= ~ZFS_NO_EXECS_DENIED; 1060 else 1061 *pflags |= ZFS_NO_EXECS_DENIED; 1062 1063 return (mode); 1064 } 1065 1066 /* 1067 * Read an external acl object. If the intent is to modify, always 1068 * create a new acl and leave any cached acl in place. 1069 */ 1070 int 1071 zfs_acl_node_read(struct znode *zp, boolean_t have_lock, zfs_acl_t **aclpp, 1072 boolean_t will_modify) 1073 { 1074 zfs_acl_t *aclp; 1075 int aclsize = 0; 1076 int acl_count = 0; 1077 zfs_acl_node_t *aclnode; 1078 zfs_acl_phys_t znode_acl; 1079 int version; 1080 int error; 1081 boolean_t drop_lock = B_FALSE; 1082 1083 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1084 1085 if (zp->z_acl_cached && !will_modify) { 1086 *aclpp = zp->z_acl_cached; 1087 return (0); 1088 } 1089 1090 /* 1091 * close race where znode could be upgrade while trying to 1092 * read the znode attributes. 1093 * 1094 * But this could only happen if the file isn't already an SA 1095 * znode 1096 */ 1097 if (!zp->z_is_sa && !have_lock) { 1098 mutex_enter(&zp->z_lock); 1099 drop_lock = B_TRUE; 1100 } 1101 version = zfs_znode_acl_version(zp); 1102 1103 if ((error = zfs_acl_znode_info(zp, &aclsize, 1104 &acl_count, &znode_acl)) != 0) { 1105 goto done; 1106 } 1107 1108 aclp = zfs_acl_alloc(version); 1109 1110 aclp->z_acl_count = acl_count; 1111 aclp->z_acl_bytes = aclsize; 1112 1113 aclnode = zfs_acl_node_alloc(aclsize); 1114 aclnode->z_ace_count = aclp->z_acl_count; 1115 aclnode->z_size = aclsize; 1116 1117 if (!zp->z_is_sa) { 1118 if (znode_acl.z_acl_extern_obj) { 1119 error = dmu_read(ZTOZSB(zp)->z_os, 1120 znode_acl.z_acl_extern_obj, 0, aclnode->z_size, 1121 aclnode->z_acldata, DMU_READ_PREFETCH); 1122 } else { 1123 memcpy(aclnode->z_acldata, znode_acl.z_ace_data, 1124 aclnode->z_size); 1125 } 1126 } else { 1127 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(ZTOZSB(zp)), 1128 aclnode->z_acldata, aclnode->z_size); 1129 } 1130 1131 if (error != 0) { 1132 zfs_acl_free(aclp); 1133 zfs_acl_node_free(aclnode); 1134 /* convert checksum errors into IO errors */ 1135 if (error == ECKSUM) 1136 error = SET_ERROR(EIO); 1137 goto done; 1138 } 1139 1140 list_insert_head(&aclp->z_acl, aclnode); 1141 1142 *aclpp = aclp; 1143 if (!will_modify) 1144 zp->z_acl_cached = aclp; 1145 done: 1146 if (drop_lock) 1147 mutex_exit(&zp->z_lock); 1148 return (error); 1149 } 1150 1151 void 1152 zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen, 1153 boolean_t start, void *userdata) 1154 { 1155 (void) buflen; 1156 zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata; 1157 1158 if (start) { 1159 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl); 1160 } else { 1161 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl, 1162 cb->cb_acl_node); 1163 } 1164 ASSERT3P(cb->cb_acl_node, !=, NULL); 1165 *dataptr = cb->cb_acl_node->z_acldata; 1166 *length = cb->cb_acl_node->z_size; 1167 } 1168 1169 int 1170 zfs_acl_chown_setattr(znode_t *zp) 1171 { 1172 int error; 1173 zfs_acl_t *aclp; 1174 1175 if (ZTOZSB(zp)->z_acl_type == ZFS_ACLTYPE_POSIX) 1176 return (0); 1177 1178 ASSERT(MUTEX_HELD(&zp->z_lock)); 1179 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1180 1181 error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE); 1182 if (error == 0 && aclp->z_acl_count > 0) 1183 zp->z_mode = ZTOI(zp)->i_mode = 1184 zfs_mode_compute(zp->z_mode, aclp, 1185 &zp->z_pflags, KUID_TO_SUID(ZTOI(zp)->i_uid), 1186 KGID_TO_SGID(ZTOI(zp)->i_gid)); 1187 1188 /* 1189 * Some ZFS implementations (ZEVO) create neither a ZNODE_ACL 1190 * nor a DACL_ACES SA in which case ENOENT is returned from 1191 * zfs_acl_node_read() when the SA can't be located. 1192 * Allow chown/chgrp to succeed in these cases rather than 1193 * returning an error that makes no sense in the context of 1194 * the caller. 1195 */ 1196 if (error == ENOENT) 1197 return (0); 1198 1199 return (error); 1200 } 1201 1202 typedef struct trivial_acl { 1203 uint32_t allow0; /* allow mask for bits only in owner */ 1204 uint32_t deny1; /* deny mask for bits not in owner */ 1205 uint32_t deny2; /* deny mask for bits not in group */ 1206 uint32_t owner; /* allow mask matching mode */ 1207 uint32_t group; /* allow mask matching mode */ 1208 uint32_t everyone; /* allow mask matching mode */ 1209 } trivial_acl_t; 1210 1211 static void 1212 acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks) 1213 { 1214 uint32_t read_mask = ACE_READ_DATA; 1215 uint32_t write_mask = ACE_WRITE_DATA|ACE_APPEND_DATA; 1216 uint32_t execute_mask = ACE_EXECUTE; 1217 1218 if (isdir) 1219 write_mask |= ACE_DELETE_CHILD; 1220 1221 masks->deny1 = 0; 1222 1223 if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) 1224 masks->deny1 |= read_mask; 1225 if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) 1226 masks->deny1 |= write_mask; 1227 if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))) 1228 masks->deny1 |= execute_mask; 1229 1230 masks->deny2 = 0; 1231 if (!(mode & S_IRGRP) && (mode & S_IROTH)) 1232 masks->deny2 |= read_mask; 1233 if (!(mode & S_IWGRP) && (mode & S_IWOTH)) 1234 masks->deny2 |= write_mask; 1235 if (!(mode & S_IXGRP) && (mode & S_IXOTH)) 1236 masks->deny2 |= execute_mask; 1237 1238 masks->allow0 = 0; 1239 if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH))) 1240 masks->allow0 |= read_mask; 1241 if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH))) 1242 masks->allow0 |= write_mask; 1243 if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH))) 1244 masks->allow0 |= execute_mask; 1245 1246 masks->owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL| 1247 ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES| 1248 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE; 1249 if (mode & S_IRUSR) 1250 masks->owner |= read_mask; 1251 if (mode & S_IWUSR) 1252 masks->owner |= write_mask; 1253 if (mode & S_IXUSR) 1254 masks->owner |= execute_mask; 1255 1256 masks->group = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS| 1257 ACE_SYNCHRONIZE; 1258 if (mode & S_IRGRP) 1259 masks->group |= read_mask; 1260 if (mode & S_IWGRP) 1261 masks->group |= write_mask; 1262 if (mode & S_IXGRP) 1263 masks->group |= execute_mask; 1264 1265 masks->everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS| 1266 ACE_SYNCHRONIZE; 1267 if (mode & S_IROTH) 1268 masks->everyone |= read_mask; 1269 if (mode & S_IWOTH) 1270 masks->everyone |= write_mask; 1271 if (mode & S_IXOTH) 1272 masks->everyone |= execute_mask; 1273 } 1274 1275 /* 1276 * ace_trivial: 1277 * determine whether an ace_t acl is trivial 1278 * 1279 * Trivialness implies that the acl is composed of only 1280 * owner, group, everyone entries. ACL can't 1281 * have read_acl denied, and write_owner/write_acl/write_attributes 1282 * can only be owner@ entry. 1283 */ 1284 static int 1285 ace_trivial_common(void *acep, int aclcnt, 1286 uintptr_t (*walk)(void *, uintptr_t, int, 1287 uint16_t *, uint16_t *, uint32_t *)) 1288 { 1289 uint16_t flags; 1290 uint32_t mask; 1291 uint16_t type; 1292 uint64_t cookie = 0; 1293 1294 while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) { 1295 switch (flags & ACE_TYPE_FLAGS) { 1296 case ACE_OWNER: 1297 case ACE_GROUP|ACE_IDENTIFIER_GROUP: 1298 case ACE_EVERYONE: 1299 break; 1300 default: 1301 return (1); 1302 } 1303 1304 if (flags & (ACE_FILE_INHERIT_ACE| 1305 ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE| 1306 ACE_INHERIT_ONLY_ACE)) 1307 return (1); 1308 1309 /* 1310 * Special check for some special bits 1311 * 1312 * Don't allow anybody to deny reading basic 1313 * attributes or a files ACL. 1314 */ 1315 if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) && 1316 (type == ACE_ACCESS_DENIED_ACE_TYPE)) 1317 return (1); 1318 1319 /* 1320 * Delete permission is never set by default 1321 */ 1322 if (mask & ACE_DELETE) 1323 return (1); 1324 1325 /* 1326 * Child delete permission should be accompanied by write 1327 */ 1328 if ((mask & ACE_DELETE_CHILD) && !(mask & ACE_WRITE_DATA)) 1329 return (1); 1330 1331 /* 1332 * only allow owner@ to have 1333 * write_acl/write_owner/write_attributes/write_xattr/ 1334 */ 1335 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE && 1336 (!(flags & ACE_OWNER) && (mask & 1337 (ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES| 1338 ACE_WRITE_NAMED_ATTRS)))) 1339 return (1); 1340 1341 } 1342 1343 return (0); 1344 } 1345 1346 /* 1347 * common code for setting ACLs. 1348 * 1349 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl. 1350 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's 1351 * already checked the acl and knows whether to inherit. 1352 */ 1353 int 1354 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx) 1355 { 1356 int error; 1357 zfsvfs_t *zfsvfs = ZTOZSB(zp); 1358 dmu_object_type_t otype; 1359 zfs_acl_locator_cb_t locate = { 0 }; 1360 uint64_t mode; 1361 sa_bulk_attr_t bulk[5]; 1362 uint64_t ctime[2]; 1363 int count = 0; 1364 zfs_acl_phys_t acl_phys; 1365 1366 mode = zp->z_mode; 1367 1368 mode = zfs_mode_compute(mode, aclp, &zp->z_pflags, 1369 KUID_TO_SUID(ZTOI(zp)->i_uid), KGID_TO_SGID(ZTOI(zp)->i_gid)); 1370 1371 zp->z_mode = ZTOI(zp)->i_mode = mode; 1372 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1373 &mode, sizeof (mode)); 1374 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1375 &zp->z_pflags, sizeof (zp->z_pflags)); 1376 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 1377 &ctime, sizeof (ctime)); 1378 1379 if (zp->z_acl_cached) { 1380 zfs_acl_free(zp->z_acl_cached); 1381 zp->z_acl_cached = NULL; 1382 } 1383 1384 /* 1385 * Upgrade needed? 1386 */ 1387 if (!zfsvfs->z_use_fuids) { 1388 otype = DMU_OT_OLDACL; 1389 } else { 1390 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) && 1391 (zfsvfs->z_version >= ZPL_VERSION_FUID)) 1392 zfs_acl_xform(zp, aclp, cr); 1393 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID); 1394 otype = DMU_OT_ACL; 1395 } 1396 1397 /* 1398 * Arrgh, we have to handle old on disk format 1399 * as well as newer (preferred) SA format. 1400 */ 1401 1402 if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */ 1403 locate.cb_aclp = aclp; 1404 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs), 1405 zfs_acl_data_locator, &locate, aclp->z_acl_bytes); 1406 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs), 1407 NULL, &aclp->z_acl_count, sizeof (uint64_t)); 1408 } else { /* Painful legacy way */ 1409 zfs_acl_node_t *aclnode; 1410 uint64_t off = 0; 1411 uint64_t aoid; 1412 1413 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs), 1414 &acl_phys, sizeof (acl_phys))) != 0) 1415 return (error); 1416 1417 aoid = acl_phys.z_acl_extern_obj; 1418 1419 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1420 /* 1421 * If ACL was previously external and we are now 1422 * converting to new ACL format then release old 1423 * ACL object and create a new one. 1424 */ 1425 if (aoid && 1426 aclp->z_version != acl_phys.z_acl_version) { 1427 error = dmu_object_free(zfsvfs->z_os, aoid, tx); 1428 if (error) 1429 return (error); 1430 aoid = 0; 1431 } 1432 if (aoid == 0) { 1433 aoid = dmu_object_alloc(zfsvfs->z_os, 1434 otype, aclp->z_acl_bytes, 1435 otype == DMU_OT_ACL ? 1436 DMU_OT_SYSACL : DMU_OT_NONE, 1437 otype == DMU_OT_ACL ? 1438 DN_OLD_MAX_BONUSLEN : 0, tx); 1439 } else { 1440 (void) dmu_object_set_blocksize(zfsvfs->z_os, 1441 aoid, aclp->z_acl_bytes, 0, tx); 1442 } 1443 acl_phys.z_acl_extern_obj = aoid; 1444 for (aclnode = list_head(&aclp->z_acl); aclnode; 1445 aclnode = list_next(&aclp->z_acl, aclnode)) { 1446 if (aclnode->z_ace_count == 0) 1447 continue; 1448 dmu_write(zfsvfs->z_os, aoid, off, 1449 aclnode->z_size, aclnode->z_acldata, tx); 1450 off += aclnode->z_size; 1451 } 1452 } else { 1453 void *start = acl_phys.z_ace_data; 1454 /* 1455 * Migrating back embedded? 1456 */ 1457 if (acl_phys.z_acl_extern_obj) { 1458 error = dmu_object_free(zfsvfs->z_os, 1459 acl_phys.z_acl_extern_obj, tx); 1460 if (error) 1461 return (error); 1462 acl_phys.z_acl_extern_obj = 0; 1463 } 1464 1465 for (aclnode = list_head(&aclp->z_acl); aclnode; 1466 aclnode = list_next(&aclp->z_acl, aclnode)) { 1467 if (aclnode->z_ace_count == 0) 1468 continue; 1469 memcpy(start, aclnode->z_acldata, 1470 aclnode->z_size); 1471 start = (caddr_t)start + aclnode->z_size; 1472 } 1473 } 1474 /* 1475 * If Old version then swap count/bytes to match old 1476 * layout of znode_acl_phys_t. 1477 */ 1478 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1479 acl_phys.z_acl_size = aclp->z_acl_count; 1480 acl_phys.z_acl_count = aclp->z_acl_bytes; 1481 } else { 1482 acl_phys.z_acl_size = aclp->z_acl_bytes; 1483 acl_phys.z_acl_count = aclp->z_acl_count; 1484 } 1485 acl_phys.z_acl_version = aclp->z_version; 1486 1487 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 1488 &acl_phys, sizeof (acl_phys)); 1489 } 1490 1491 /* 1492 * Replace ACL wide bits, but first clear them. 1493 */ 1494 zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS; 1495 1496 zp->z_pflags |= aclp->z_hints; 1497 1498 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0) 1499 zp->z_pflags |= ZFS_ACL_TRIVIAL; 1500 1501 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime); 1502 return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx)); 1503 } 1504 1505 static void 1506 zfs_acl_chmod(boolean_t isdir, uint64_t mode, boolean_t split, boolean_t trim, 1507 zfs_acl_t *aclp) 1508 { 1509 void *acep = NULL; 1510 uint64_t who; 1511 int new_count, new_bytes; 1512 int ace_size; 1513 int entry_type; 1514 uint16_t iflags, type; 1515 uint32_t access_mask; 1516 zfs_acl_node_t *newnode; 1517 size_t abstract_size = aclp->z_ops->ace_abstract_size(); 1518 void *zacep; 1519 trivial_acl_t masks; 1520 1521 new_count = new_bytes = 0; 1522 1523 acl_trivial_access_masks((mode_t)mode, isdir, &masks); 1524 1525 newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes); 1526 1527 zacep = newnode->z_acldata; 1528 if (masks.allow0) { 1529 zfs_set_ace(aclp, zacep, masks.allow0, ALLOW, -1, ACE_OWNER); 1530 zacep = (void *)((uintptr_t)zacep + abstract_size); 1531 new_count++; 1532 new_bytes += abstract_size; 1533 } 1534 if (masks.deny1) { 1535 zfs_set_ace(aclp, zacep, masks.deny1, DENY, -1, ACE_OWNER); 1536 zacep = (void *)((uintptr_t)zacep + abstract_size); 1537 new_count++; 1538 new_bytes += abstract_size; 1539 } 1540 if (masks.deny2) { 1541 zfs_set_ace(aclp, zacep, masks.deny2, DENY, -1, OWNING_GROUP); 1542 zacep = (void *)((uintptr_t)zacep + abstract_size); 1543 new_count++; 1544 new_bytes += abstract_size; 1545 } 1546 1547 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 1548 &iflags, &type))) { 1549 entry_type = (iflags & ACE_TYPE_FLAGS); 1550 /* 1551 * ACEs used to represent the file mode may be divided 1552 * into an equivalent pair of inherit-only and regular 1553 * ACEs, if they are inheritable. 1554 * Skip regular ACEs, which are replaced by the new mode. 1555 */ 1556 if (split && (entry_type == ACE_OWNER || 1557 entry_type == OWNING_GROUP || 1558 entry_type == ACE_EVERYONE)) { 1559 if (!isdir || !(iflags & 1560 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE))) 1561 continue; 1562 /* 1563 * We preserve owner@, group@, or @everyone 1564 * permissions, if they are inheritable, by 1565 * copying them to inherit_only ACEs. This 1566 * prevents inheritable permissions from being 1567 * altered along with the file mode. 1568 */ 1569 iflags |= ACE_INHERIT_ONLY_ACE; 1570 } 1571 1572 /* 1573 * If this ACL has any inheritable ACEs, mark that in 1574 * the hints (which are later masked into the pflags) 1575 * so create knows to do inheritance. 1576 */ 1577 if (isdir && (iflags & 1578 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE))) 1579 aclp->z_hints |= ZFS_INHERIT_ACE; 1580 1581 if ((type != ALLOW && type != DENY) || 1582 (iflags & ACE_INHERIT_ONLY_ACE)) { 1583 switch (type) { 1584 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1585 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1586 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1587 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1588 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 1589 break; 1590 } 1591 } else { 1592 /* 1593 * Limit permissions to be no greater than 1594 * group permissions. 1595 * The "aclinherit" and "aclmode" properties 1596 * affect policy for create and chmod(2), 1597 * respectively. 1598 */ 1599 if ((type == ALLOW) && trim) 1600 access_mask &= masks.group; 1601 } 1602 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags); 1603 ace_size = aclp->z_ops->ace_size(acep); 1604 zacep = (void *)((uintptr_t)zacep + ace_size); 1605 new_count++; 1606 new_bytes += ace_size; 1607 } 1608 zfs_set_ace(aclp, zacep, masks.owner, ALLOW, -1, ACE_OWNER); 1609 zacep = (void *)((uintptr_t)zacep + abstract_size); 1610 zfs_set_ace(aclp, zacep, masks.group, ALLOW, -1, OWNING_GROUP); 1611 zacep = (void *)((uintptr_t)zacep + abstract_size); 1612 zfs_set_ace(aclp, zacep, masks.everyone, ALLOW, -1, ACE_EVERYONE); 1613 1614 new_count += 3; 1615 new_bytes += abstract_size * 3; 1616 zfs_acl_release_nodes(aclp); 1617 aclp->z_acl_count = new_count; 1618 aclp->z_acl_bytes = new_bytes; 1619 newnode->z_ace_count = new_count; 1620 newnode->z_size = new_bytes; 1621 list_insert_tail(&aclp->z_acl, newnode); 1622 } 1623 1624 int 1625 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode) 1626 { 1627 int error = 0; 1628 1629 mutex_enter(&zp->z_acl_lock); 1630 mutex_enter(&zp->z_lock); 1631 if (ZTOZSB(zp)->z_acl_mode == ZFS_ACL_DISCARD) 1632 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1633 else 1634 error = zfs_acl_node_read(zp, B_TRUE, aclp, B_TRUE); 1635 1636 if (error == 0) { 1637 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS; 1638 zfs_acl_chmod(S_ISDIR(ZTOI(zp)->i_mode), mode, B_TRUE, 1639 (ZTOZSB(zp)->z_acl_mode == ZFS_ACL_GROUPMASK), *aclp); 1640 } 1641 mutex_exit(&zp->z_lock); 1642 mutex_exit(&zp->z_acl_lock); 1643 1644 return (error); 1645 } 1646 1647 /* 1648 * Should ACE be inherited? 1649 */ 1650 static int 1651 zfs_ace_can_use(umode_t obj_mode, uint16_t acep_flags) 1652 { 1653 int iflags = (acep_flags & 0xf); 1654 1655 if (S_ISDIR(obj_mode) && (iflags & ACE_DIRECTORY_INHERIT_ACE)) 1656 return (1); 1657 else if (iflags & ACE_FILE_INHERIT_ACE) 1658 return (!(S_ISDIR(obj_mode) && 1659 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE))); 1660 return (0); 1661 } 1662 1663 /* 1664 * inherit inheritable ACEs from parent 1665 */ 1666 static zfs_acl_t * 1667 zfs_acl_inherit(zfsvfs_t *zfsvfs, umode_t va_mode, zfs_acl_t *paclp, 1668 uint64_t mode, boolean_t *need_chmod) 1669 { 1670 void *pacep = NULL; 1671 void *acep; 1672 zfs_acl_node_t *aclnode; 1673 zfs_acl_t *aclp = NULL; 1674 uint64_t who; 1675 uint32_t access_mask; 1676 uint16_t iflags, newflags, type; 1677 size_t ace_size; 1678 void *data1, *data2; 1679 size_t data1sz, data2sz; 1680 uint_t aclinherit; 1681 boolean_t isdir = S_ISDIR(va_mode); 1682 boolean_t isreg = S_ISREG(va_mode); 1683 1684 *need_chmod = B_TRUE; 1685 1686 aclp = zfs_acl_alloc(paclp->z_version); 1687 aclinherit = zfsvfs->z_acl_inherit; 1688 if (aclinherit == ZFS_ACL_DISCARD || S_ISLNK(va_mode)) 1689 return (aclp); 1690 1691 while ((pacep = zfs_acl_next_ace(paclp, pacep, &who, 1692 &access_mask, &iflags, &type))) { 1693 1694 /* 1695 * don't inherit bogus ACEs 1696 */ 1697 if (!zfs_acl_valid_ace_type(type, iflags)) 1698 continue; 1699 1700 /* 1701 * Check if ACE is inheritable by this vnode 1702 */ 1703 if ((aclinherit == ZFS_ACL_NOALLOW && type == ALLOW) || 1704 !zfs_ace_can_use(va_mode, iflags)) 1705 continue; 1706 1707 /* 1708 * If owner@, group@, or everyone@ inheritable 1709 * then zfs_acl_chmod() isn't needed. 1710 */ 1711 if ((aclinherit == ZFS_ACL_PASSTHROUGH || 1712 aclinherit == ZFS_ACL_PASSTHROUGH_X) && 1713 ((iflags & (ACE_OWNER|ACE_EVERYONE)) || 1714 ((iflags & OWNING_GROUP) == OWNING_GROUP)) && 1715 (isreg || (isdir && (iflags & ACE_DIRECTORY_INHERIT_ACE)))) 1716 *need_chmod = B_FALSE; 1717 1718 /* 1719 * Strip inherited execute permission from file if 1720 * not in mode 1721 */ 1722 if (aclinherit == ZFS_ACL_PASSTHROUGH_X && type == ALLOW && 1723 !isdir && ((mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)) { 1724 access_mask &= ~ACE_EXECUTE; 1725 } 1726 1727 /* 1728 * Strip write_acl and write_owner from permissions 1729 * when inheriting an ACE 1730 */ 1731 if (aclinherit == ZFS_ACL_RESTRICTED && type == ALLOW) { 1732 access_mask &= ~RESTRICTED_CLEAR; 1733 } 1734 1735 ace_size = aclp->z_ops->ace_size(pacep); 1736 aclnode = zfs_acl_node_alloc(ace_size); 1737 list_insert_tail(&aclp->z_acl, aclnode); 1738 acep = aclnode->z_acldata; 1739 1740 zfs_set_ace(aclp, acep, access_mask, type, 1741 who, iflags|ACE_INHERITED_ACE); 1742 1743 /* 1744 * Copy special opaque data if any 1745 */ 1746 if ((data1sz = paclp->z_ops->ace_data(pacep, &data1)) != 0) { 1747 VERIFY((data2sz = aclp->z_ops->ace_data(acep, 1748 &data2)) == data1sz); 1749 memcpy(data2, data1, data2sz); 1750 } 1751 1752 aclp->z_acl_count++; 1753 aclnode->z_ace_count++; 1754 aclp->z_acl_bytes += aclnode->z_size; 1755 newflags = aclp->z_ops->ace_flags_get(acep); 1756 1757 /* 1758 * If ACE is not to be inherited further, or if the vnode is 1759 * not a directory, remove all inheritance flags 1760 */ 1761 if (!isdir || (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)) { 1762 newflags &= ~ALL_INHERIT; 1763 aclp->z_ops->ace_flags_set(acep, 1764 newflags|ACE_INHERITED_ACE); 1765 continue; 1766 } 1767 1768 /* 1769 * This directory has an inheritable ACE 1770 */ 1771 aclp->z_hints |= ZFS_INHERIT_ACE; 1772 1773 /* 1774 * If only FILE_INHERIT is set then turn on 1775 * inherit_only 1776 */ 1777 if ((iflags & (ACE_FILE_INHERIT_ACE | 1778 ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) { 1779 newflags |= ACE_INHERIT_ONLY_ACE; 1780 aclp->z_ops->ace_flags_set(acep, 1781 newflags|ACE_INHERITED_ACE); 1782 } else { 1783 newflags &= ~ACE_INHERIT_ONLY_ACE; 1784 aclp->z_ops->ace_flags_set(acep, 1785 newflags|ACE_INHERITED_ACE); 1786 } 1787 } 1788 if (zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED && 1789 aclp->z_acl_count != 0) { 1790 *need_chmod = B_FALSE; 1791 } 1792 1793 return (aclp); 1794 } 1795 1796 /* 1797 * Create file system object initial permissions 1798 * including inheritable ACEs. 1799 * Also, create FUIDs for owner and group. 1800 */ 1801 int 1802 zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr, 1803 vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids, zidmap_t *mnt_ns) 1804 { 1805 int error; 1806 zfsvfs_t *zfsvfs = ZTOZSB(dzp); 1807 zfs_acl_t *paclp; 1808 gid_t gid = vap->va_gid; 1809 boolean_t need_chmod = B_TRUE; 1810 boolean_t trim = B_FALSE; 1811 boolean_t inherited = B_FALSE; 1812 1813 memset(acl_ids, 0, sizeof (zfs_acl_ids_t)); 1814 acl_ids->z_mode = vap->va_mode; 1815 1816 if (vsecp) 1817 if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_mode, vsecp, 1818 cr, &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0) 1819 return (error); 1820 1821 acl_ids->z_fuid = vap->va_uid; 1822 acl_ids->z_fgid = vap->va_gid; 1823 #ifdef HAVE_KSID 1824 /* 1825 * Determine uid and gid. 1826 */ 1827 if ((flag & IS_ROOT_NODE) || zfsvfs->z_replay || 1828 ((flag & IS_XATTR) && (S_ISDIR(vap->va_mode)))) { 1829 acl_ids->z_fuid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_uid, 1830 cr, ZFS_OWNER, &acl_ids->z_fuidp); 1831 acl_ids->z_fgid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid, 1832 cr, ZFS_GROUP, &acl_ids->z_fuidp); 1833 gid = vap->va_gid; 1834 } else { 1835 acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER, 1836 cr, &acl_ids->z_fuidp); 1837 acl_ids->z_fgid = 0; 1838 if (vap->va_mask & AT_GID) { 1839 acl_ids->z_fgid = zfs_fuid_create(zfsvfs, 1840 (uint64_t)vap->va_gid, 1841 cr, ZFS_GROUP, &acl_ids->z_fuidp); 1842 gid = vap->va_gid; 1843 if (acl_ids->z_fgid != KGID_TO_SGID(ZTOI(dzp)->i_gid) && 1844 !groupmember(vap->va_gid, cr) && 1845 secpolicy_vnode_create_gid(cr) != 0) 1846 acl_ids->z_fgid = 0; 1847 } 1848 if (acl_ids->z_fgid == 0) { 1849 if (dzp->z_mode & S_ISGID) { 1850 char *domain; 1851 uint32_t rid; 1852 1853 acl_ids->z_fgid = KGID_TO_SGID( 1854 ZTOI(dzp)->i_gid); 1855 gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid, 1856 cr, ZFS_GROUP); 1857 1858 if (zfsvfs->z_use_fuids && 1859 IS_EPHEMERAL(acl_ids->z_fgid)) { 1860 domain = zfs_fuid_idx_domain( 1861 &zfsvfs->z_fuid_idx, 1862 FUID_INDEX(acl_ids->z_fgid)); 1863 rid = FUID_RID(acl_ids->z_fgid); 1864 zfs_fuid_node_add(&acl_ids->z_fuidp, 1865 domain, rid, 1866 FUID_INDEX(acl_ids->z_fgid), 1867 acl_ids->z_fgid, ZFS_GROUP); 1868 } 1869 } else { 1870 acl_ids->z_fgid = zfs_fuid_create_cred(zfsvfs, 1871 ZFS_GROUP, cr, &acl_ids->z_fuidp); 1872 gid = crgetgid(cr); 1873 } 1874 } 1875 } 1876 #endif /* HAVE_KSID */ 1877 1878 /* 1879 * If we're creating a directory, and the parent directory has the 1880 * set-GID bit set, set in on the new directory. 1881 * Otherwise, if the user is neither privileged nor a member of the 1882 * file's new group, clear the file's set-GID bit. 1883 */ 1884 1885 if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) && 1886 (S_ISDIR(vap->va_mode))) { 1887 acl_ids->z_mode |= S_ISGID; 1888 } else { 1889 if ((acl_ids->z_mode & S_ISGID) && 1890 secpolicy_vnode_setids_setgids(cr, gid, mnt_ns, 1891 zfs_i_user_ns(ZTOI(dzp))) != 0) { 1892 acl_ids->z_mode &= ~S_ISGID; 1893 } 1894 } 1895 1896 if (acl_ids->z_aclp == NULL) { 1897 mutex_enter(&dzp->z_acl_lock); 1898 mutex_enter(&dzp->z_lock); 1899 if (!(flag & IS_ROOT_NODE) && 1900 (dzp->z_pflags & ZFS_INHERIT_ACE) && 1901 !(dzp->z_pflags & ZFS_XATTR)) { 1902 VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE, 1903 &paclp, B_FALSE)); 1904 acl_ids->z_aclp = zfs_acl_inherit(zfsvfs, 1905 vap->va_mode, paclp, acl_ids->z_mode, &need_chmod); 1906 inherited = B_TRUE; 1907 } else { 1908 acl_ids->z_aclp = 1909 zfs_acl_alloc(zfs_acl_version_zp(dzp)); 1910 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL; 1911 } 1912 mutex_exit(&dzp->z_lock); 1913 mutex_exit(&dzp->z_acl_lock); 1914 1915 if (need_chmod) { 1916 if (S_ISDIR(vap->va_mode)) 1917 acl_ids->z_aclp->z_hints |= 1918 ZFS_ACL_AUTO_INHERIT; 1919 1920 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK && 1921 zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH && 1922 zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH_X) 1923 trim = B_TRUE; 1924 zfs_acl_chmod(vap->va_mode, acl_ids->z_mode, B_FALSE, 1925 trim, acl_ids->z_aclp); 1926 } 1927 } 1928 1929 if (inherited || vsecp) { 1930 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode, 1931 acl_ids->z_aclp, &acl_ids->z_aclp->z_hints, 1932 acl_ids->z_fuid, acl_ids->z_fgid); 1933 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0) 1934 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL; 1935 } 1936 1937 return (0); 1938 } 1939 1940 /* 1941 * Free ACL and fuid_infop, but not the acl_ids structure 1942 */ 1943 void 1944 zfs_acl_ids_free(zfs_acl_ids_t *acl_ids) 1945 { 1946 if (acl_ids->z_aclp) 1947 zfs_acl_free(acl_ids->z_aclp); 1948 if (acl_ids->z_fuidp) 1949 zfs_fuid_info_free(acl_ids->z_fuidp); 1950 acl_ids->z_aclp = NULL; 1951 acl_ids->z_fuidp = NULL; 1952 } 1953 1954 boolean_t 1955 zfs_acl_ids_overquota(zfsvfs_t *zv, zfs_acl_ids_t *acl_ids, uint64_t projid) 1956 { 1957 return (zfs_id_overquota(zv, DMU_USERUSED_OBJECT, acl_ids->z_fuid) || 1958 zfs_id_overquota(zv, DMU_GROUPUSED_OBJECT, acl_ids->z_fgid) || 1959 (projid != ZFS_DEFAULT_PROJID && projid != ZFS_INVALID_PROJID && 1960 zfs_id_overquota(zv, DMU_PROJECTUSED_OBJECT, projid))); 1961 } 1962 1963 /* 1964 * Retrieve a file's ACL 1965 */ 1966 int 1967 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1968 { 1969 zfs_acl_t *aclp; 1970 ulong_t mask; 1971 int error; 1972 int count = 0; 1973 int largeace = 0; 1974 1975 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1976 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1977 1978 if (mask == 0) 1979 return (SET_ERROR(ENOSYS)); 1980 1981 if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr, 1982 zfs_init_idmap))) 1983 return (error); 1984 1985 mutex_enter(&zp->z_acl_lock); 1986 1987 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE); 1988 if (error != 0) { 1989 mutex_exit(&zp->z_acl_lock); 1990 return (error); 1991 } 1992 1993 /* 1994 * Scan ACL to determine number of ACEs 1995 */ 1996 if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) { 1997 void *zacep = NULL; 1998 uint64_t who; 1999 uint32_t access_mask; 2000 uint16_t type, iflags; 2001 2002 while ((zacep = zfs_acl_next_ace(aclp, zacep, 2003 &who, &access_mask, &iflags, &type))) { 2004 switch (type) { 2005 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 2006 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 2007 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 2008 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 2009 largeace++; 2010 continue; 2011 default: 2012 count++; 2013 } 2014 } 2015 vsecp->vsa_aclcnt = count; 2016 } else 2017 count = (int)aclp->z_acl_count; 2018 2019 if (mask & VSA_ACECNT) { 2020 vsecp->vsa_aclcnt = count; 2021 } 2022 2023 if (mask & VSA_ACE) { 2024 size_t aclsz; 2025 2026 aclsz = count * sizeof (ace_t) + 2027 sizeof (ace_object_t) * largeace; 2028 2029 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 2030 vsecp->vsa_aclentsz = aclsz; 2031 2032 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 2033 zfs_copy_fuid_2_ace(ZTOZSB(zp), aclp, cr, 2034 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 2035 else { 2036 zfs_acl_node_t *aclnode; 2037 void *start = vsecp->vsa_aclentp; 2038 2039 for (aclnode = list_head(&aclp->z_acl); aclnode; 2040 aclnode = list_next(&aclp->z_acl, aclnode)) { 2041 memcpy(start, aclnode->z_acldata, 2042 aclnode->z_size); 2043 start = (caddr_t)start + aclnode->z_size; 2044 } 2045 ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp == 2046 aclp->z_acl_bytes); 2047 } 2048 } 2049 if (mask & VSA_ACE_ACLFLAGS) { 2050 vsecp->vsa_aclflags = 0; 2051 if (zp->z_pflags & ZFS_ACL_DEFAULTED) 2052 vsecp->vsa_aclflags |= ACL_DEFAULTED; 2053 if (zp->z_pflags & ZFS_ACL_PROTECTED) 2054 vsecp->vsa_aclflags |= ACL_PROTECTED; 2055 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT) 2056 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 2057 } 2058 2059 mutex_exit(&zp->z_acl_lock); 2060 2061 return (0); 2062 } 2063 2064 int 2065 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, umode_t obj_mode, 2066 vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp) 2067 { 2068 zfs_acl_t *aclp; 2069 zfs_acl_node_t *aclnode; 2070 int aclcnt = vsecp->vsa_aclcnt; 2071 int error; 2072 2073 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 2074 return (SET_ERROR(EINVAL)); 2075 2076 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 2077 2078 aclp->z_hints = 0; 2079 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 2080 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 2081 if ((error = zfs_copy_ace_2_oldace(obj_mode, aclp, 2082 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 2083 aclcnt, &aclnode->z_size)) != 0) { 2084 zfs_acl_free(aclp); 2085 zfs_acl_node_free(aclnode); 2086 return (error); 2087 } 2088 } else { 2089 if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_mode, aclp, 2090 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 2091 &aclnode->z_size, fuidp, cr)) != 0) { 2092 zfs_acl_free(aclp); 2093 zfs_acl_node_free(aclnode); 2094 return (error); 2095 } 2096 } 2097 aclp->z_acl_bytes = aclnode->z_size; 2098 aclnode->z_ace_count = aclcnt; 2099 aclp->z_acl_count = aclcnt; 2100 list_insert_head(&aclp->z_acl, aclnode); 2101 2102 /* 2103 * If flags are being set then add them to z_hints 2104 */ 2105 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2106 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2107 aclp->z_hints |= ZFS_ACL_PROTECTED; 2108 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2109 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2110 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2111 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2112 } 2113 2114 *zaclp = aclp; 2115 2116 return (0); 2117 } 2118 2119 /* 2120 * Set a file's ACL 2121 */ 2122 int 2123 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2124 { 2125 zfsvfs_t *zfsvfs = ZTOZSB(zp); 2126 zilog_t *zilog = zfsvfs->z_log; 2127 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2128 dmu_tx_t *tx; 2129 int error; 2130 zfs_acl_t *aclp; 2131 zfs_fuid_info_t *fuidp = NULL; 2132 boolean_t fuid_dirtied; 2133 uint64_t acl_obj; 2134 2135 if (mask == 0) 2136 return (SET_ERROR(ENOSYS)); 2137 2138 if (zp->z_pflags & ZFS_IMMUTABLE) 2139 return (SET_ERROR(EPERM)); 2140 2141 if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr, 2142 zfs_init_idmap))) 2143 return (error); 2144 2145 error = zfs_vsec_2_aclp(zfsvfs, ZTOI(zp)->i_mode, vsecp, cr, &fuidp, 2146 &aclp); 2147 if (error) 2148 return (error); 2149 2150 /* 2151 * If ACL wide flags aren't being set then preserve any 2152 * existing flags. 2153 */ 2154 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2155 aclp->z_hints |= 2156 (zp->z_pflags & V4_ACL_WIDE_FLAGS); 2157 } 2158 top: 2159 mutex_enter(&zp->z_acl_lock); 2160 mutex_enter(&zp->z_lock); 2161 2162 tx = dmu_tx_create(zfsvfs->z_os); 2163 2164 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 2165 2166 fuid_dirtied = zfsvfs->z_fuid_dirty; 2167 if (fuid_dirtied) 2168 zfs_fuid_txhold(zfsvfs, tx); 2169 2170 /* 2171 * If old version and ACL won't fit in bonus and we aren't 2172 * upgrading then take out necessary DMU holds 2173 */ 2174 2175 if ((acl_obj = zfs_external_acl(zp)) != 0) { 2176 if (zfsvfs->z_version >= ZPL_VERSION_FUID && 2177 zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) { 2178 dmu_tx_hold_free(tx, acl_obj, 0, 2179 DMU_OBJECT_END); 2180 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2181 aclp->z_acl_bytes); 2182 } else { 2183 dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes); 2184 } 2185 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2186 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2187 } 2188 2189 zfs_sa_upgrade_txholds(tx, zp); 2190 error = dmu_tx_assign(tx, TXG_NOWAIT); 2191 if (error) { 2192 mutex_exit(&zp->z_acl_lock); 2193 mutex_exit(&zp->z_lock); 2194 2195 if (error == ERESTART) { 2196 dmu_tx_wait(tx); 2197 dmu_tx_abort(tx); 2198 goto top; 2199 } 2200 dmu_tx_abort(tx); 2201 zfs_acl_free(aclp); 2202 return (error); 2203 } 2204 2205 error = zfs_aclset_common(zp, aclp, cr, tx); 2206 ASSERT(error == 0); 2207 ASSERT(zp->z_acl_cached == NULL); 2208 zp->z_acl_cached = aclp; 2209 2210 if (fuid_dirtied) 2211 zfs_fuid_sync(zfsvfs, tx); 2212 2213 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2214 2215 if (fuidp) 2216 zfs_fuid_info_free(fuidp); 2217 dmu_tx_commit(tx); 2218 2219 mutex_exit(&zp->z_lock); 2220 mutex_exit(&zp->z_acl_lock); 2221 2222 return (error); 2223 } 2224 2225 /* 2226 * Check accesses of interest (AoI) against attributes of the dataset 2227 * such as read-only. Returns zero if no AoI conflict with dataset 2228 * attributes, otherwise an appropriate errno is returned. 2229 */ 2230 static int 2231 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode) 2232 { 2233 if ((v4_mode & WRITE_MASK) && (zfs_is_readonly(ZTOZSB(zp))) && 2234 (!Z_ISDEV(ZTOI(zp)->i_mode) || (v4_mode & WRITE_MASK_ATTRS))) { 2235 return (SET_ERROR(EROFS)); 2236 } 2237 2238 /* 2239 * Intentionally allow ZFS_READONLY through here. 2240 * See zfs_zaccess_common(). 2241 */ 2242 if ((v4_mode & WRITE_MASK_DATA) && 2243 (zp->z_pflags & ZFS_IMMUTABLE)) { 2244 return (SET_ERROR(EPERM)); 2245 } 2246 2247 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2248 (zp->z_pflags & ZFS_NOUNLINK)) { 2249 return (SET_ERROR(EPERM)); 2250 } 2251 2252 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2253 (zp->z_pflags & ZFS_AV_QUARANTINED))) { 2254 return (SET_ERROR(EACCES)); 2255 } 2256 2257 return (0); 2258 } 2259 2260 /* 2261 * The primary usage of this function is to loop through all of the 2262 * ACEs in the znode, determining what accesses of interest (AoI) to 2263 * the caller are allowed or denied. The AoI are expressed as bits in 2264 * the working_mode parameter. As each ACE is processed, bits covered 2265 * by that ACE are removed from the working_mode. This removal 2266 * facilitates two things. The first is that when the working mode is 2267 * empty (= 0), we know we've looked at all the AoI. The second is 2268 * that the ACE interpretation rules don't allow a later ACE to undo 2269 * something granted or denied by an earlier ACE. Removing the 2270 * discovered access or denial enforces this rule. At the end of 2271 * processing the ACEs, all AoI that were found to be denied are 2272 * placed into the working_mode, giving the caller a mask of denied 2273 * accesses. Returns: 2274 * 0 if all AoI granted 2275 * EACCES if the denied mask is non-zero 2276 * other error if abnormal failure (e.g., IO error) 2277 * 2278 * A secondary usage of the function is to determine if any of the 2279 * AoI are granted. If an ACE grants any access in 2280 * the working_mode, we immediately short circuit out of the function. 2281 * This mode is chosen by setting anyaccess to B_TRUE. The 2282 * working_mode is not a denied access mask upon exit if the function 2283 * is used in this manner. 2284 */ 2285 static int 2286 zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode, 2287 boolean_t anyaccess, cred_t *cr, zidmap_t *mnt_ns) 2288 { 2289 zfsvfs_t *zfsvfs = ZTOZSB(zp); 2290 zfs_acl_t *aclp; 2291 int error; 2292 uid_t uid = crgetuid(cr); 2293 uint64_t who; 2294 uint16_t type, iflags; 2295 uint16_t entry_type; 2296 uint32_t access_mask; 2297 uint32_t deny_mask = 0; 2298 zfs_ace_hdr_t *acep = NULL; 2299 boolean_t checkit; 2300 uid_t gowner; 2301 uid_t fowner; 2302 2303 if (mnt_ns) { 2304 fowner = zfs_uid_to_vfsuid(mnt_ns, zfs_i_user_ns(ZTOI(zp)), 2305 KUID_TO_SUID(ZTOI(zp)->i_uid)); 2306 gowner = zfs_gid_to_vfsgid(mnt_ns, zfs_i_user_ns(ZTOI(zp)), 2307 KGID_TO_SGID(ZTOI(zp)->i_gid)); 2308 } else 2309 zfs_fuid_map_ids(zp, cr, &fowner, &gowner); 2310 2311 mutex_enter(&zp->z_acl_lock); 2312 2313 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE); 2314 if (error != 0) { 2315 mutex_exit(&zp->z_acl_lock); 2316 return (error); 2317 } 2318 2319 ASSERT(zp->z_acl_cached); 2320 2321 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2322 &iflags, &type))) { 2323 uint32_t mask_matched; 2324 2325 if (!zfs_acl_valid_ace_type(type, iflags)) 2326 continue; 2327 2328 if (S_ISDIR(ZTOI(zp)->i_mode) && 2329 (iflags & ACE_INHERIT_ONLY_ACE)) 2330 continue; 2331 2332 /* Skip ACE if it does not affect any AoI */ 2333 mask_matched = (access_mask & *working_mode); 2334 if (!mask_matched) 2335 continue; 2336 2337 entry_type = (iflags & ACE_TYPE_FLAGS); 2338 2339 checkit = B_FALSE; 2340 2341 switch (entry_type) { 2342 case ACE_OWNER: 2343 if (uid == fowner) 2344 checkit = B_TRUE; 2345 break; 2346 case OWNING_GROUP: 2347 who = gowner; 2348 zfs_fallthrough; 2349 case ACE_IDENTIFIER_GROUP: 2350 checkit = zfs_groupmember(zfsvfs, who, cr); 2351 break; 2352 case ACE_EVERYONE: 2353 checkit = B_TRUE; 2354 break; 2355 2356 /* USER Entry */ 2357 default: 2358 if (entry_type == 0) { 2359 uid_t newid; 2360 2361 newid = zfs_fuid_map_id(zfsvfs, who, cr, 2362 ZFS_ACE_USER); 2363 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2364 uid == newid) 2365 checkit = B_TRUE; 2366 break; 2367 } else { 2368 mutex_exit(&zp->z_acl_lock); 2369 return (SET_ERROR(EIO)); 2370 } 2371 } 2372 2373 if (checkit) { 2374 if (type == DENY) { 2375 DTRACE_PROBE3(zfs__ace__denies, 2376 znode_t *, zp, 2377 zfs_ace_hdr_t *, acep, 2378 uint32_t, mask_matched); 2379 deny_mask |= mask_matched; 2380 } else { 2381 DTRACE_PROBE3(zfs__ace__allows, 2382 znode_t *, zp, 2383 zfs_ace_hdr_t *, acep, 2384 uint32_t, mask_matched); 2385 if (anyaccess) { 2386 mutex_exit(&zp->z_acl_lock); 2387 return (0); 2388 } 2389 } 2390 *working_mode &= ~mask_matched; 2391 } 2392 2393 /* Are we done? */ 2394 if (*working_mode == 0) 2395 break; 2396 } 2397 2398 mutex_exit(&zp->z_acl_lock); 2399 2400 /* Put the found 'denies' back on the working mode */ 2401 if (deny_mask) { 2402 *working_mode |= deny_mask; 2403 return (SET_ERROR(EACCES)); 2404 } else if (*working_mode) { 2405 return (-1); 2406 } 2407 2408 return (0); 2409 } 2410 2411 /* 2412 * Return true if any access whatsoever granted, we don't actually 2413 * care what access is granted. 2414 */ 2415 boolean_t 2416 zfs_has_access(znode_t *zp, cred_t *cr) 2417 { 2418 uint32_t have = ACE_ALL_PERMS; 2419 2420 if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr, 2421 zfs_init_idmap) != 0) { 2422 uid_t owner; 2423 2424 owner = zfs_fuid_map_id(ZTOZSB(zp), 2425 KUID_TO_SUID(ZTOI(zp)->i_uid), cr, ZFS_OWNER); 2426 return (secpolicy_vnode_any_access(cr, ZTOI(zp), owner) == 0); 2427 } 2428 return (B_TRUE); 2429 } 2430 2431 /* 2432 * Simplified access check for case where ACL is known to not contain 2433 * information beyond what is defined in the mode. In this case, we 2434 * can pass along to the kernel / vfs generic_permission() check, which 2435 * evaluates the mode and POSIX ACL. 2436 * 2437 * NFSv4 ACLs allow granting permissions that are usually relegated only 2438 * to the file owner or superuser. Examples are ACE_WRITE_OWNER (chown), 2439 * ACE_WRITE_ACL(chmod), and ACE_DELETE. ACE_DELETE requests must fail 2440 * because with conventional posix permissions, right to delete file 2441 * is determined by write bit on the parent dir. 2442 * 2443 * If unmappable perms are requested, then we must return EPERM 2444 * and include those bits in the working_mode so that the caller of 2445 * zfs_zaccess_common() can decide whether to perform additional 2446 * policy / capability checks. EACCES is used in zfs_zaccess_aces_check() 2447 * to indicate access check failed due to explicit DENY entry, and so 2448 * we want to avoid that here. 2449 */ 2450 static int 2451 zfs_zaccess_trivial(znode_t *zp, uint32_t *working_mode, cred_t *cr, 2452 zidmap_t *mnt_ns) 2453 { 2454 int err, mask; 2455 int unmapped = 0; 2456 2457 ASSERT(zp->z_pflags & ZFS_ACL_TRIVIAL); 2458 2459 mask = zfs_v4_to_unix(*working_mode, &unmapped); 2460 if (mask == 0 || unmapped) { 2461 *working_mode = unmapped; 2462 return (unmapped ? SET_ERROR(EPERM) : 0); 2463 } 2464 2465 #if (defined(HAVE_IOPS_PERMISSION_USERNS) || \ 2466 defined(HAVE_IOPS_PERMISSION_IDMAP)) 2467 err = generic_permission(mnt_ns, ZTOI(zp), mask); 2468 #else 2469 err = generic_permission(ZTOI(zp), mask); 2470 #endif 2471 if (err != 0) { 2472 return (SET_ERROR(EPERM)); 2473 } 2474 2475 *working_mode = unmapped; 2476 2477 return (0); 2478 } 2479 2480 static int 2481 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2482 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr, zidmap_t *mnt_ns) 2483 { 2484 zfsvfs_t *zfsvfs = ZTOZSB(zp); 2485 int err; 2486 2487 *working_mode = v4_mode; 2488 *check_privs = B_TRUE; 2489 2490 /* 2491 * Short circuit empty requests 2492 */ 2493 if (v4_mode == 0 || zfsvfs->z_replay) { 2494 *working_mode = 0; 2495 return (0); 2496 } 2497 2498 if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) { 2499 *check_privs = B_FALSE; 2500 return (err); 2501 } 2502 2503 /* 2504 * The caller requested that the ACL check be skipped. This 2505 * would only happen if the caller checked VOP_ACCESS() with a 2506 * 32 bit ACE mask and already had the appropriate permissions. 2507 */ 2508 if (skipaclchk) { 2509 *working_mode = 0; 2510 return (0); 2511 } 2512 2513 /* 2514 * Note: ZFS_READONLY represents the "DOS R/O" attribute. 2515 * When that flag is set, we should behave as if write access 2516 * were not granted by anything in the ACL. In particular: 2517 * We _must_ allow writes after opening the file r/w, then 2518 * setting the DOS R/O attribute, and writing some more. 2519 * (Similar to how you can write after fchmod(fd, 0444).) 2520 * 2521 * Therefore ZFS_READONLY is ignored in the dataset check 2522 * above, and checked here as if part of the ACL check. 2523 * Also note: DOS R/O is ignored for directories. 2524 */ 2525 if ((v4_mode & WRITE_MASK_DATA) && 2526 S_ISDIR(ZTOI(zp)->i_mode) && 2527 (zp->z_pflags & ZFS_READONLY)) { 2528 return (SET_ERROR(EPERM)); 2529 } 2530 2531 if (zp->z_pflags & ZFS_ACL_TRIVIAL) 2532 return (zfs_zaccess_trivial(zp, working_mode, cr, mnt_ns)); 2533 2534 return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr, mnt_ns)); 2535 } 2536 2537 static int 2538 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2539 cred_t *cr, zidmap_t *mnt_ns) 2540 { 2541 if (*working_mode != ACE_WRITE_DATA) 2542 return (SET_ERROR(EACCES)); 2543 2544 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2545 check_privs, B_FALSE, cr, mnt_ns)); 2546 } 2547 2548 int 2549 zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr) 2550 { 2551 boolean_t owner = B_FALSE; 2552 boolean_t groupmbr = B_FALSE; 2553 boolean_t is_attr; 2554 uid_t uid = crgetuid(cr); 2555 int error; 2556 2557 if (zdp->z_pflags & ZFS_AV_QUARANTINED) 2558 return (SET_ERROR(EACCES)); 2559 2560 is_attr = ((zdp->z_pflags & ZFS_XATTR) && 2561 (S_ISDIR(ZTOI(zdp)->i_mode))); 2562 if (is_attr) 2563 goto slow; 2564 2565 2566 mutex_enter(&zdp->z_acl_lock); 2567 2568 if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) { 2569 mutex_exit(&zdp->z_acl_lock); 2570 return (0); 2571 } 2572 2573 if (KUID_TO_SUID(ZTOI(zdp)->i_uid) != 0 || 2574 KGID_TO_SGID(ZTOI(zdp)->i_gid) != 0) { 2575 mutex_exit(&zdp->z_acl_lock); 2576 goto slow; 2577 } 2578 2579 if (uid == KUID_TO_SUID(ZTOI(zdp)->i_uid)) { 2580 if (zdp->z_mode & S_IXUSR) { 2581 mutex_exit(&zdp->z_acl_lock); 2582 return (0); 2583 } else { 2584 mutex_exit(&zdp->z_acl_lock); 2585 goto slow; 2586 } 2587 } 2588 if (groupmember(KGID_TO_SGID(ZTOI(zdp)->i_gid), cr)) { 2589 if (zdp->z_mode & S_IXGRP) { 2590 mutex_exit(&zdp->z_acl_lock); 2591 return (0); 2592 } else { 2593 mutex_exit(&zdp->z_acl_lock); 2594 goto slow; 2595 } 2596 } 2597 if (!owner && !groupmbr) { 2598 if (zdp->z_mode & S_IXOTH) { 2599 mutex_exit(&zdp->z_acl_lock); 2600 return (0); 2601 } 2602 } 2603 2604 mutex_exit(&zdp->z_acl_lock); 2605 2606 slow: 2607 DTRACE_PROBE(zfs__fastpath__execute__access__miss); 2608 if ((error = zfs_enter(ZTOZSB(zdp), FTAG)) != 0) 2609 return (error); 2610 error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr, 2611 zfs_init_idmap); 2612 zfs_exit(ZTOZSB(zdp), FTAG); 2613 return (error); 2614 } 2615 2616 /* 2617 * Determine whether Access should be granted/denied. 2618 * 2619 * The least priv subsystem is always consulted as a basic privilege 2620 * can define any form of access. 2621 */ 2622 int 2623 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr, 2624 zidmap_t *mnt_ns) 2625 { 2626 uint32_t working_mode; 2627 int error; 2628 int is_attr; 2629 boolean_t check_privs; 2630 znode_t *xzp; 2631 znode_t *check_zp = zp; 2632 mode_t needed_bits; 2633 uid_t owner; 2634 2635 is_attr = ((zp->z_pflags & ZFS_XATTR) && S_ISDIR(ZTOI(zp)->i_mode)); 2636 2637 /* 2638 * If attribute then validate against base file 2639 */ 2640 if (is_attr) { 2641 if ((error = zfs_zget(ZTOZSB(zp), 2642 zp->z_xattr_parent, &xzp)) != 0) { 2643 return (error); 2644 } 2645 2646 check_zp = xzp; 2647 2648 /* 2649 * fixup mode to map to xattr perms 2650 */ 2651 2652 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2653 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2654 mode |= ACE_WRITE_NAMED_ATTRS; 2655 } 2656 2657 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2658 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2659 mode |= ACE_READ_NAMED_ATTRS; 2660 } 2661 } 2662 2663 owner = zfs_uid_to_vfsuid(mnt_ns, zfs_i_user_ns(ZTOI(zp)), 2664 KUID_TO_SUID(ZTOI(zp)->i_uid)); 2665 owner = zfs_fuid_map_id(ZTOZSB(zp), owner, cr, ZFS_OWNER); 2666 2667 /* 2668 * Map the bits required to the standard inode flags 2669 * S_IRUSR|S_IWUSR|S_IXUSR in the needed_bits. Map the bits 2670 * mapped by working_mode (currently missing) in missing_bits. 2671 * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode), 2672 * needed_bits. 2673 */ 2674 needed_bits = 0; 2675 2676 working_mode = mode; 2677 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) && 2678 owner == crgetuid(cr)) 2679 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2680 2681 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2682 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE)) 2683 needed_bits |= S_IRUSR; 2684 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2685 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE)) 2686 needed_bits |= S_IWUSR; 2687 if (working_mode & ACE_EXECUTE) 2688 needed_bits |= S_IXUSR; 2689 2690 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2691 &check_privs, skipaclchk, cr, mnt_ns)) == 0) { 2692 if (is_attr) 2693 zrele(xzp); 2694 return (secpolicy_vnode_access2(cr, ZTOI(zp), owner, 2695 needed_bits, needed_bits)); 2696 } 2697 2698 if (error && !check_privs) { 2699 if (is_attr) 2700 zrele(xzp); 2701 return (error); 2702 } 2703 2704 if (error && (flags & V_APPEND)) { 2705 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr, 2706 mnt_ns); 2707 } 2708 2709 if (error && check_privs) { 2710 mode_t checkmode = 0; 2711 2712 /* 2713 * First check for implicit owner permission on 2714 * read_acl/read_attributes 2715 */ 2716 2717 ASSERT(working_mode != 0); 2718 2719 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2720 owner == crgetuid(cr))) 2721 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2722 2723 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2724 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE)) 2725 checkmode |= S_IRUSR; 2726 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2727 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE)) 2728 checkmode |= S_IWUSR; 2729 if (working_mode & ACE_EXECUTE) 2730 checkmode |= S_IXUSR; 2731 2732 error = secpolicy_vnode_access2(cr, ZTOI(check_zp), owner, 2733 needed_bits & ~checkmode, needed_bits); 2734 2735 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2736 error = secpolicy_vnode_chown(cr, owner); 2737 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2738 error = secpolicy_vnode_setdac(cr, owner); 2739 2740 if (error == 0 && (working_mode & 2741 (ACE_DELETE|ACE_DELETE_CHILD))) 2742 error = secpolicy_vnode_remove(cr); 2743 2744 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) { 2745 error = secpolicy_vnode_chown(cr, owner); 2746 } 2747 if (error == 0) { 2748 /* 2749 * See if any bits other than those already checked 2750 * for are still present. If so then return EACCES 2751 */ 2752 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2753 error = SET_ERROR(EACCES); 2754 } 2755 } 2756 } else if (error == 0) { 2757 error = secpolicy_vnode_access2(cr, ZTOI(zp), owner, 2758 needed_bits, needed_bits); 2759 } 2760 2761 if (is_attr) 2762 zrele(xzp); 2763 2764 return (error); 2765 } 2766 2767 /* 2768 * Translate traditional unix S_IRUSR/S_IWUSR/S_IXUSR mode into 2769 * NFSv4-style ZFS ACL format and call zfs_zaccess() 2770 */ 2771 int 2772 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr, 2773 zidmap_t *mnt_ns) 2774 { 2775 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr, 2776 mnt_ns)); 2777 } 2778 2779 /* 2780 * Access function for secpolicy_vnode_setattr 2781 */ 2782 int 2783 zfs_zaccess_unix(void *zp, int mode, cred_t *cr) 2784 { 2785 int v4_mode = zfs_unix_to_v4(mode >> 6); 2786 2787 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr, zfs_init_idmap)); 2788 } 2789 2790 /* See zfs_zaccess_delete() */ 2791 static const boolean_t zfs_write_implies_delete_child = B_TRUE; 2792 2793 /* 2794 * Determine whether delete access should be granted. 2795 * 2796 * The following chart outlines how we handle delete permissions which is 2797 * how recent versions of windows (Windows 2008) handles it. The efficiency 2798 * comes from not having to check the parent ACL where the object itself grants 2799 * delete: 2800 * 2801 * ------------------------------------------------------- 2802 * | Parent Dir | Target Object Permissions | 2803 * | permissions | | 2804 * ------------------------------------------------------- 2805 * | | ACL Allows | ACL Denies| Delete | 2806 * | | Delete | Delete | unspecified| 2807 * ------------------------------------------------------- 2808 * | ACL Allows | Permit | Deny * | Permit | 2809 * | DELETE_CHILD | | | | 2810 * ------------------------------------------------------- 2811 * | ACL Denies | Permit | Deny | Deny | 2812 * | DELETE_CHILD | | | | 2813 * ------------------------------------------------------- 2814 * | ACL specifies | | | | 2815 * | only allow | Permit | Deny * | Permit | 2816 * | write and | | | | 2817 * | execute | | | | 2818 * ------------------------------------------------------- 2819 * | ACL denies | | | | 2820 * | write and | Permit | Deny | Deny | 2821 * | execute | | | | 2822 * ------------------------------------------------------- 2823 * ^ 2824 * | 2825 * Re. execute permission on the directory: if that's missing, 2826 * the vnode lookup of the target will fail before we get here. 2827 * 2828 * Re [*] in the table above: NFSv4 would normally Permit delete for 2829 * these two cells of the matrix. 2830 * See acl.h for notes on which ACE_... flags should be checked for which 2831 * operations. Specifically, the NFSv4 committee recommendation is in 2832 * conflict with the Windows interpretation of DENY ACEs, where DENY ACEs 2833 * should take precedence ahead of ALLOW ACEs. 2834 * 2835 * This implementation always consults the target object's ACL first. 2836 * If a DENY ACE is present on the target object that specifies ACE_DELETE, 2837 * delete access is denied. If an ALLOW ACE with ACE_DELETE is present on 2838 * the target object, access is allowed. If and only if no entries with 2839 * ACE_DELETE are present in the object's ACL, check the container's ACL 2840 * for entries with ACE_DELETE_CHILD. 2841 * 2842 * A summary of the logic implemented from the table above is as follows: 2843 * 2844 * First check for DENY ACEs that apply. 2845 * If either target or container has a deny, EACCES. 2846 * 2847 * Delete access can then be summarized as follows: 2848 * 1: The object to be deleted grants ACE_DELETE, or 2849 * 2: The containing directory grants ACE_DELETE_CHILD. 2850 * In a Windows system, that would be the end of the story. 2851 * In this system, (2) has some complications... 2852 * 2a: "sticky" bit on a directory adds restrictions, and 2853 * 2b: existing ACEs from previous versions of ZFS may 2854 * not carry ACE_DELETE_CHILD where they should, so we 2855 * also allow delete when ACE_WRITE_DATA is granted. 2856 * 2857 * Note: 2b is technically a work-around for a prior bug, 2858 * which hopefully can go away some day. For those who 2859 * no longer need the work around, and for testing, this 2860 * work-around is made conditional via the tunable: 2861 * zfs_write_implies_delete_child 2862 */ 2863 int 2864 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr, zidmap_t *mnt_ns) 2865 { 2866 uint32_t wanted_dirperms; 2867 uint32_t dzp_working_mode = 0; 2868 uint32_t zp_working_mode = 0; 2869 int dzp_error, zp_error; 2870 boolean_t dzpcheck_privs; 2871 boolean_t zpcheck_privs; 2872 2873 if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2874 return (SET_ERROR(EPERM)); 2875 2876 /* 2877 * Case 1: 2878 * If target object grants ACE_DELETE then we are done. This is 2879 * indicated by a return value of 0. For this case we don't worry 2880 * about the sticky bit because sticky only applies to the parent 2881 * directory and this is the child access result. 2882 * 2883 * If we encounter a DENY ACE here, we're also done (EACCES). 2884 * Note that if we hit a DENY ACE here (on the target) it should 2885 * take precedence over a DENY ACE on the container, so that when 2886 * we have more complete auditing support we will be able to 2887 * report an access failure against the specific target. 2888 * (This is part of why we're checking the target first.) 2889 */ 2890 zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2891 &zpcheck_privs, B_FALSE, cr, mnt_ns); 2892 if (zp_error == EACCES) { 2893 /* We hit a DENY ACE. */ 2894 if (!zpcheck_privs) 2895 return (SET_ERROR(zp_error)); 2896 return (secpolicy_vnode_remove(cr)); 2897 2898 } 2899 if (zp_error == 0) 2900 return (0); 2901 2902 /* 2903 * Case 2: 2904 * If the containing directory grants ACE_DELETE_CHILD, 2905 * or we're in backward compatibility mode and the 2906 * containing directory has ACE_WRITE_DATA, allow. 2907 * Case 2b is handled with wanted_dirperms. 2908 */ 2909 wanted_dirperms = ACE_DELETE_CHILD; 2910 if (zfs_write_implies_delete_child) 2911 wanted_dirperms |= ACE_WRITE_DATA; 2912 dzp_error = zfs_zaccess_common(dzp, wanted_dirperms, 2913 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr, mnt_ns); 2914 if (dzp_error == EACCES) { 2915 /* We hit a DENY ACE. */ 2916 if (!dzpcheck_privs) 2917 return (SET_ERROR(dzp_error)); 2918 return (secpolicy_vnode_remove(cr)); 2919 } 2920 2921 /* 2922 * Cases 2a, 2b (continued) 2923 * 2924 * Note: dzp_working_mode now contains any permissions 2925 * that were NOT granted. Therefore, if any of the 2926 * wanted_dirperms WERE granted, we will have: 2927 * dzp_working_mode != wanted_dirperms 2928 * We're really asking if ANY of those permissions 2929 * were granted, and if so, grant delete access. 2930 */ 2931 if (dzp_working_mode != wanted_dirperms) 2932 dzp_error = 0; 2933 2934 /* 2935 * dzp_error is 0 if the container granted us permissions to "modify". 2936 * If we do not have permission via one or more ACEs, our current 2937 * privileges may still permit us to modify the container. 2938 * 2939 * dzpcheck_privs is false when i.e. the FS is read-only. 2940 * Otherwise, do privilege checks for the container. 2941 */ 2942 if (dzp_error != 0 && dzpcheck_privs) { 2943 uid_t owner; 2944 2945 /* 2946 * The secpolicy call needs the requested access and 2947 * the current access mode of the container, but it 2948 * only knows about Unix-style modes (VEXEC, VWRITE), 2949 * so this must condense the fine-grained ACE bits into 2950 * Unix modes. 2951 * 2952 * The VEXEC flag is easy, because we know that has 2953 * always been checked before we get here (during the 2954 * lookup of the target vnode). The container has not 2955 * granted us permissions to "modify", so we do not set 2956 * the VWRITE flag in the current access mode. 2957 */ 2958 owner = zfs_fuid_map_id(ZTOZSB(dzp), 2959 KUID_TO_SUID(ZTOI(dzp)->i_uid), cr, ZFS_OWNER); 2960 dzp_error = secpolicy_vnode_access2(cr, ZTOI(dzp), 2961 owner, S_IXUSR, S_IWUSR|S_IXUSR); 2962 } 2963 if (dzp_error != 0) { 2964 /* 2965 * Note: We may have dzp_error = -1 here (from 2966 * zfs_zacess_common). Don't return that. 2967 */ 2968 return (SET_ERROR(EACCES)); 2969 } 2970 2971 2972 /* 2973 * At this point, we know that the directory permissions allow 2974 * us to modify, but we still need to check for the additional 2975 * restrictions that apply when the "sticky bit" is set. 2976 * 2977 * Yes, zfs_sticky_remove_access() also checks this bit, but 2978 * checking it here and skipping the call below is nice when 2979 * you're watching all of this with dtrace. 2980 */ 2981 if ((dzp->z_mode & S_ISVTX) == 0) 2982 return (0); 2983 2984 /* 2985 * zfs_sticky_remove_access will succeed if: 2986 * 1. The sticky bit is absent. 2987 * 2. We pass the sticky bit restrictions. 2988 * 3. We have privileges that always allow file removal. 2989 */ 2990 return (zfs_sticky_remove_access(dzp, zp, cr)); 2991 } 2992 2993 int 2994 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2995 znode_t *tzp, cred_t *cr, zidmap_t *mnt_ns) 2996 { 2997 int add_perm; 2998 int error; 2999 3000 if (szp->z_pflags & ZFS_AV_QUARANTINED) 3001 return (SET_ERROR(EACCES)); 3002 3003 add_perm = S_ISDIR(ZTOI(szp)->i_mode) ? 3004 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 3005 3006 /* 3007 * Rename permissions are combination of delete permission + 3008 * add file/subdir permission. 3009 */ 3010 3011 /* 3012 * first make sure we do the delete portion. 3013 * 3014 * If that succeeds then check for add_file/add_subdir permissions 3015 */ 3016 3017 if ((error = zfs_zaccess_delete(sdzp, szp, cr, mnt_ns))) 3018 return (error); 3019 3020 /* 3021 * If we have a tzp, see if we can delete it? 3022 */ 3023 if (tzp) { 3024 if ((error = zfs_zaccess_delete(tdzp, tzp, cr, mnt_ns))) 3025 return (error); 3026 } 3027 3028 /* 3029 * Now check for add permissions 3030 */ 3031 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr, mnt_ns); 3032 3033 return (error); 3034 } 3035