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