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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/systm.h> 32 #include <sys/sysmacros.h> 33 #include <sys/resource.h> 34 #include <sys/vfs.h> 35 #include <sys/vnode.h> 36 #include <sys/sid.h> 37 #include <sys/file.h> 38 #include <sys/stat.h> 39 #include <sys/kmem.h> 40 #include <sys/cmn_err.h> 41 #include <sys/errno.h> 42 #include <sys/unistd.h> 43 #include <sys/sdt.h> 44 #include <sys/fs/zfs.h> 45 #include <sys/mode.h> 46 #include <sys/policy.h> 47 #include <sys/zfs_znode.h> 48 #include <sys/zfs_fuid.h> 49 #include <sys/zfs_acl.h> 50 #include <sys/zfs_dir.h> 51 #include <sys/zfs_vfsops.h> 52 #include <sys/dmu.h> 53 #include <sys/dnode.h> 54 #include <sys/zap.h> 55 #include "fs/fs_subr.h" 56 #include <acl/acl_common.h> 57 58 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE 59 #define DENY ACE_ACCESS_DENIED_ACE_TYPE 60 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE 61 62 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP) 63 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \ 64 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE) 65 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \ 66 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 67 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \ 68 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS) 69 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS) 70 71 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \ 72 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \ 73 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \ 74 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE) 75 76 #define WRITE_MASK (WRITE_MASK_DATA|ACE_WRITE_ATTRIBUTES|ACE_WRITE_ACL|\ 77 ACE_WRITE_OWNER) 78 79 #define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 80 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 81 82 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \ 83 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE) 84 85 #define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \ 86 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE) 87 88 #define SECURE_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER) 89 90 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\ 91 ZFS_ACL_PROTECTED) 92 93 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\ 94 ZFS_ACL_OBJ_ACE) 95 96 static uint16_t 97 zfs_ace_v0_get_type(void *acep) 98 { 99 return (((zfs_oldace_t *)acep)->z_type); 100 } 101 102 static uint16_t 103 zfs_ace_v0_get_flags(void *acep) 104 { 105 return (((zfs_oldace_t *)acep)->z_flags); 106 } 107 108 static uint32_t 109 zfs_ace_v0_get_mask(void *acep) 110 { 111 return (((zfs_oldace_t *)acep)->z_access_mask); 112 } 113 114 static uint64_t 115 zfs_ace_v0_get_who(void *acep) 116 { 117 return (((zfs_oldace_t *)acep)->z_fuid); 118 } 119 120 static void 121 zfs_ace_v0_set_type(void *acep, uint16_t type) 122 { 123 ((zfs_oldace_t *)acep)->z_type = type; 124 } 125 126 static void 127 zfs_ace_v0_set_flags(void *acep, uint16_t flags) 128 { 129 ((zfs_oldace_t *)acep)->z_flags = flags; 130 } 131 132 static void 133 zfs_ace_v0_set_mask(void *acep, uint32_t mask) 134 { 135 ((zfs_oldace_t *)acep)->z_access_mask = mask; 136 } 137 138 static void 139 zfs_ace_v0_set_who(void *acep, uint64_t who) 140 { 141 ((zfs_oldace_t *)acep)->z_fuid = who; 142 } 143 144 /*ARGSUSED*/ 145 static size_t 146 zfs_ace_v0_size(void *acep) 147 { 148 return (sizeof (zfs_oldace_t)); 149 } 150 151 static size_t 152 zfs_ace_v0_abstract_size(void) 153 { 154 return (sizeof (zfs_oldace_t)); 155 } 156 157 static int 158 zfs_ace_v0_mask_off(void) 159 { 160 return (offsetof(zfs_oldace_t, z_access_mask)); 161 } 162 163 /*ARGSUSED*/ 164 static int 165 zfs_ace_v0_data(void *acep, void **datap) 166 { 167 *datap = NULL; 168 return (0); 169 } 170 171 static acl_ops_t zfs_acl_v0_ops = { 172 zfs_ace_v0_get_mask, 173 zfs_ace_v0_set_mask, 174 zfs_ace_v0_get_flags, 175 zfs_ace_v0_set_flags, 176 zfs_ace_v0_get_type, 177 zfs_ace_v0_set_type, 178 zfs_ace_v0_get_who, 179 zfs_ace_v0_set_who, 180 zfs_ace_v0_size, 181 zfs_ace_v0_abstract_size, 182 zfs_ace_v0_mask_off, 183 zfs_ace_v0_data 184 }; 185 186 static uint16_t 187 zfs_ace_fuid_get_type(void *acep) 188 { 189 return (((zfs_ace_hdr_t *)acep)->z_type); 190 } 191 192 static uint16_t 193 zfs_ace_fuid_get_flags(void *acep) 194 { 195 return (((zfs_ace_hdr_t *)acep)->z_flags); 196 } 197 198 static uint32_t 199 zfs_ace_fuid_get_mask(void *acep) 200 { 201 return (((zfs_ace_hdr_t *)acep)->z_access_mask); 202 } 203 204 static uint64_t 205 zfs_ace_fuid_get_who(void *args) 206 { 207 uint16_t entry_type; 208 zfs_ace_t *acep = args; 209 210 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 211 212 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 213 entry_type == ACE_EVERYONE) 214 return (-1); 215 return (((zfs_ace_t *)acep)->z_fuid); 216 } 217 218 static void 219 zfs_ace_fuid_set_type(void *acep, uint16_t type) 220 { 221 ((zfs_ace_hdr_t *)acep)->z_type = type; 222 } 223 224 static void 225 zfs_ace_fuid_set_flags(void *acep, uint16_t flags) 226 { 227 ((zfs_ace_hdr_t *)acep)->z_flags = flags; 228 } 229 230 static void 231 zfs_ace_fuid_set_mask(void *acep, uint32_t mask) 232 { 233 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask; 234 } 235 236 static void 237 zfs_ace_fuid_set_who(void *arg, uint64_t who) 238 { 239 zfs_ace_t *acep = arg; 240 241 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS; 242 243 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP || 244 entry_type == ACE_EVERYONE) 245 return; 246 acep->z_fuid = who; 247 } 248 249 static size_t 250 zfs_ace_fuid_size(void *acep) 251 { 252 zfs_ace_hdr_t *zacep = acep; 253 uint16_t entry_type; 254 255 switch (zacep->z_type) { 256 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 257 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 258 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 259 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 260 return (sizeof (zfs_object_ace_t)); 261 case ALLOW: 262 case DENY: 263 entry_type = 264 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS); 265 if (entry_type == ACE_OWNER || 266 entry_type == (ACE_GROUP | ACE_IDENTIFIER_GROUP) || 267 entry_type == ACE_EVERYONE) 268 return (sizeof (zfs_ace_hdr_t)); 269 /*FALLTHROUGH*/ 270 default: 271 return (sizeof (zfs_ace_t)); 272 } 273 } 274 275 static size_t 276 zfs_ace_fuid_abstract_size(void) 277 { 278 return (sizeof (zfs_ace_hdr_t)); 279 } 280 281 static int 282 zfs_ace_fuid_mask_off(void) 283 { 284 return (offsetof(zfs_ace_hdr_t, z_access_mask)); 285 } 286 287 static int 288 zfs_ace_fuid_data(void *acep, void **datap) 289 { 290 zfs_ace_t *zacep = acep; 291 zfs_object_ace_t *zobjp; 292 293 switch (zacep->z_hdr.z_type) { 294 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 295 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 296 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 297 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 298 zobjp = acep; 299 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t); 300 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t)); 301 default: 302 *datap = NULL; 303 return (0); 304 } 305 } 306 307 static acl_ops_t zfs_acl_fuid_ops = { 308 zfs_ace_fuid_get_mask, 309 zfs_ace_fuid_set_mask, 310 zfs_ace_fuid_get_flags, 311 zfs_ace_fuid_set_flags, 312 zfs_ace_fuid_get_type, 313 zfs_ace_fuid_set_type, 314 zfs_ace_fuid_get_who, 315 zfs_ace_fuid_set_who, 316 zfs_ace_fuid_size, 317 zfs_ace_fuid_abstract_size, 318 zfs_ace_fuid_mask_off, 319 zfs_ace_fuid_data 320 }; 321 322 static int 323 zfs_acl_version(int version) 324 { 325 if (version < ZPL_VERSION_FUID) 326 return (ZFS_ACL_VERSION_INITIAL); 327 else 328 return (ZFS_ACL_VERSION_FUID); 329 } 330 331 static int 332 zfs_acl_version_zp(znode_t *zp) 333 { 334 return (zfs_acl_version(zp->z_zfsvfs->z_version)); 335 } 336 337 static zfs_acl_t * 338 zfs_acl_alloc(int vers) 339 { 340 zfs_acl_t *aclp; 341 342 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP); 343 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t), 344 offsetof(zfs_acl_node_t, z_next)); 345 aclp->z_version = vers; 346 if (vers == ZFS_ACL_VERSION_FUID) 347 aclp->z_ops = zfs_acl_fuid_ops; 348 else 349 aclp->z_ops = zfs_acl_v0_ops; 350 return (aclp); 351 } 352 353 static zfs_acl_node_t * 354 zfs_acl_node_alloc(size_t bytes) 355 { 356 zfs_acl_node_t *aclnode; 357 358 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP); 359 if (bytes) { 360 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP); 361 aclnode->z_allocdata = aclnode->z_acldata; 362 aclnode->z_allocsize = bytes; 363 aclnode->z_size = bytes; 364 } 365 366 return (aclnode); 367 } 368 369 static void 370 zfs_acl_node_free(zfs_acl_node_t *aclnode) 371 { 372 if (aclnode->z_allocsize) 373 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize); 374 kmem_free(aclnode, sizeof (zfs_acl_node_t)); 375 } 376 377 void 378 zfs_acl_free(zfs_acl_t *aclp) 379 { 380 zfs_acl_node_t *aclnode; 381 382 while (aclnode = list_head(&aclp->z_acl)) { 383 list_remove(&aclp->z_acl, aclnode); 384 zfs_acl_node_free(aclnode); 385 } 386 387 list_destroy(&aclp->z_acl); 388 kmem_free(aclp, sizeof (zfs_acl_t)); 389 } 390 391 static boolean_t 392 zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags) 393 { 394 /* 395 * first check type of entry 396 */ 397 398 switch (iflags & ACE_TYPE_FLAGS) { 399 case ACE_OWNER: 400 case (ACE_IDENTIFIER_GROUP | ACE_GROUP): 401 case ACE_IDENTIFIER_GROUP: 402 case ACE_EVERYONE: 403 case 0: /* User entry */ 404 break; 405 default: 406 return (B_FALSE); 407 408 } 409 410 /* 411 * next check inheritance level flags 412 */ 413 414 if (type != ALLOW && type > MAX_ACE_TYPE) { 415 return (B_FALSE); 416 } 417 418 switch (type) { 419 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 420 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 421 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 422 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 423 if (aclp->z_version < ZFS_ACL_VERSION_FUID) 424 return (B_FALSE); 425 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 426 } 427 428 /* 429 * Only directories should have inheritance flags. 430 */ 431 if (obj_type != VDIR && (iflags & 432 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE| 433 ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE))) { 434 return (B_FALSE); 435 } 436 437 if (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)) 438 aclp->z_hints |= ZFS_INHERIT_ACE; 439 440 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) { 441 if ((iflags & (ACE_FILE_INHERIT_ACE| 442 ACE_DIRECTORY_INHERIT_ACE)) == 0) { 443 return (B_FALSE); 444 } 445 } 446 447 return (B_TRUE); 448 } 449 450 static void * 451 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who, 452 uint32_t *access_mask, uint16_t *iflags, uint16_t *type) 453 { 454 zfs_acl_node_t *aclnode; 455 456 if (start == NULL) { 457 aclnode = list_head(&aclp->z_acl); 458 if (aclnode == NULL) 459 return (NULL); 460 461 aclp->z_next_ace = aclnode->z_acldata; 462 aclp->z_curr_node = aclnode; 463 aclnode->z_ace_idx = 0; 464 } 465 466 aclnode = aclp->z_curr_node; 467 468 if (aclnode == NULL) 469 return (NULL); 470 471 if (aclnode->z_ace_idx >= aclnode->z_ace_count) { 472 aclnode = list_next(&aclp->z_acl, aclnode); 473 if (aclnode == NULL) 474 return (NULL); 475 else { 476 aclp->z_curr_node = aclnode; 477 aclnode->z_ace_idx = 0; 478 aclp->z_next_ace = aclnode->z_acldata; 479 } 480 } 481 482 if (aclnode->z_ace_idx < aclnode->z_ace_count) { 483 void *acep = aclp->z_next_ace; 484 *iflags = aclp->z_ops.ace_flags_get(acep); 485 *type = aclp->z_ops.ace_type_get(acep); 486 *access_mask = aclp->z_ops.ace_mask_get(acep); 487 *who = aclp->z_ops.ace_who_get(acep); 488 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + 489 aclp->z_ops.ace_size(acep); 490 aclnode->z_ace_idx++; 491 return ((void *)acep); 492 } 493 return (NULL); 494 } 495 496 /*ARGSUSED*/ 497 static uint64_t 498 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt, 499 uint16_t *flags, uint16_t *type, uint32_t *mask) 500 { 501 zfs_acl_t *aclp = datap; 502 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie; 503 uint64_t who; 504 505 acep = zfs_acl_next_ace(aclp, acep, &who, mask, 506 flags, type); 507 return ((uint64_t)(uintptr_t)acep); 508 } 509 510 static zfs_acl_node_t * 511 zfs_acl_curr_node(zfs_acl_t *aclp) 512 { 513 ASSERT(aclp->z_curr_node); 514 return (aclp->z_curr_node); 515 } 516 517 /* 518 * Copy ACE to internal ZFS format. 519 * While processing the ACL each ACE will be validated for correctness. 520 * ACE FUIDs will be created later. 521 */ 522 int 523 zfs_copy_ace_2_fuid(vtype_t obj_type, zfs_acl_t *aclp, void *datap, 524 zfs_ace_t *z_acl, int aclcnt, size_t *size) 525 { 526 int i; 527 uint16_t entry_type; 528 zfs_ace_t *aceptr = z_acl; 529 ace_t *acep = datap; 530 zfs_object_ace_t *zobjacep; 531 ace_object_t *aceobjp; 532 533 for (i = 0; i != aclcnt; i++) { 534 aceptr->z_hdr.z_access_mask = acep->a_access_mask; 535 aceptr->z_hdr.z_flags = acep->a_flags; 536 aceptr->z_hdr.z_type = acep->a_type; 537 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS; 538 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP && 539 entry_type != ACE_EVERYONE) 540 aceptr->z_fuid = (uint64_t)acep->a_who; 541 /* 542 * Make sure ACE is valid 543 */ 544 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type, 545 aceptr->z_hdr.z_flags) != B_TRUE) 546 return (EINVAL); 547 548 switch (acep->a_type) { 549 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 550 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 551 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 552 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 553 zobjacep = (zfs_object_ace_t *)aceptr; 554 aceobjp = (ace_object_t *)acep; 555 556 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type, 557 sizeof (aceobjp->a_obj_type)); 558 bcopy(aceobjp->a_inherit_obj_type, 559 zobjacep->z_inherit_type, 560 sizeof (aceobjp->a_inherit_obj_type)); 561 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t)); 562 break; 563 default: 564 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t)); 565 } 566 567 aceptr = (zfs_ace_t *)((caddr_t)aceptr + 568 aclp->z_ops.ace_size(aceptr)); 569 } 570 571 *size = (caddr_t)aceptr - (caddr_t)z_acl; 572 573 return (0); 574 } 575 576 /* 577 * Copy ZFS ACEs to fixed size ace_t layout 578 */ 579 static void 580 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *datap, int filter) 581 { 582 uint64_t who; 583 uint32_t access_mask; 584 uint16_t iflags, type; 585 zfs_ace_hdr_t *zacep = NULL; 586 ace_t *acep = datap; 587 ace_object_t *objacep; 588 zfs_object_ace_t *zobjacep; 589 zfs_fuid_hdl_t hdl = { 0 }; 590 size_t ace_size; 591 uint16_t entry_type; 592 593 while (zacep = zfs_acl_next_ace(aclp, zacep, 594 &who, &access_mask, &iflags, &type)) { 595 596 switch (type) { 597 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 598 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 599 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 600 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 601 if (filter) { 602 continue; 603 } 604 zobjacep = (zfs_object_ace_t *)zacep; 605 objacep = (ace_object_t *)acep; 606 bcopy(zobjacep->z_object_type, 607 objacep->a_obj_type, 608 sizeof (zobjacep->z_object_type)); 609 bcopy(zobjacep->z_inherit_type, 610 objacep->a_inherit_obj_type, 611 sizeof (zobjacep->z_inherit_type)); 612 ace_size = sizeof (ace_object_t); 613 break; 614 default: 615 ace_size = sizeof (ace_t); 616 break; 617 } 618 619 entry_type = (iflags & ACE_TYPE_FLAGS); 620 if ((entry_type != ACE_OWNER && 621 entry_type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 622 entry_type != ACE_EVERYONE)) 623 zfs_fuid_queue_map_id(zfsvfs, &hdl, who, 624 (entry_type & ACE_IDENTIFIER_GROUP) ? 625 ZFS_ACE_GROUP : ZFS_ACE_USER, &acep->a_who); 626 else 627 acep->a_who = (uid_t)(int64_t)who; 628 acep->a_access_mask = access_mask; 629 acep->a_flags = iflags; 630 acep->a_type = type; 631 acep = (ace_t *)((caddr_t)acep + ace_size); 632 } 633 zfs_fuid_get_mappings(&hdl); 634 } 635 636 static int 637 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep, 638 zfs_oldace_t *z_acl, int aclcnt, size_t *size) 639 { 640 int i; 641 zfs_oldace_t *aceptr = z_acl; 642 643 for (i = 0; i != aclcnt; i++, aceptr++) { 644 aceptr->z_access_mask = acep[i].a_access_mask; 645 aceptr->z_type = acep[i].a_type; 646 aceptr->z_flags = acep[i].a_flags; 647 aceptr->z_fuid = acep[i].a_who; 648 /* 649 * Make sure ACE is valid 650 */ 651 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type, 652 aceptr->z_flags) != B_TRUE) 653 return (EINVAL); 654 } 655 *size = (caddr_t)aceptr - (caddr_t)z_acl; 656 return (0); 657 } 658 659 /* 660 * convert old ACL format to new 661 */ 662 void 663 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp) 664 { 665 zfs_oldace_t *oldaclp; 666 int i; 667 uint16_t type, iflags; 668 uint32_t access_mask; 669 uint64_t who; 670 void *cookie = NULL; 671 zfs_acl_node_t *aclnode, *newaclnode; 672 673 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL); 674 /* 675 * First create the ACE in a contiguous piece of memory 676 * for zfs_copy_ace_2_fuid(). 677 * 678 * We only convert an ACL once, so this won't happen 679 * everytime. 680 */ 681 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count, 682 KM_SLEEP); 683 i = 0; 684 while (cookie = zfs_acl_next_ace(aclp, cookie, &who, 685 &access_mask, &iflags, &type)) { 686 oldaclp[i].z_flags = iflags; 687 oldaclp[i].z_type = type; 688 oldaclp[i].z_fuid = who; 689 oldaclp[i++].z_access_mask = access_mask; 690 } 691 692 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count * 693 sizeof (zfs_object_ace_t)); 694 aclp->z_ops = zfs_acl_fuid_ops; 695 VERIFY(zfs_copy_ace_2_fuid(ZTOV(zp)->v_type, aclp, oldaclp, 696 newaclnode->z_acldata, aclp->z_acl_count, 697 &newaclnode->z_size) == 0); 698 aclp->z_acl_bytes = newaclnode->z_size; 699 newaclnode->z_ace_count = aclp->z_acl_count; 700 aclp->z_version = ZFS_ACL_VERSION; 701 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t)); 702 703 /* 704 * Release all previous ACL nodes 705 */ 706 707 while (aclnode = list_head(&aclp->z_acl)) { 708 list_remove(&aclp->z_acl, aclnode); 709 if (aclnode->z_allocsize) 710 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize); 711 kmem_free(aclnode, sizeof (zfs_acl_node_t)); 712 } 713 list_insert_head(&aclp->z_acl, newaclnode); 714 } 715 716 /* 717 * Convert unix access mask to v4 access mask 718 */ 719 static uint32_t 720 zfs_unix_to_v4(uint32_t access_mask) 721 { 722 uint32_t new_mask = 0; 723 724 if (access_mask & S_IXOTH) 725 new_mask |= ACE_EXECUTE; 726 if (access_mask & S_IWOTH) 727 new_mask |= ACE_WRITE_DATA; 728 if (access_mask & S_IROTH) 729 new_mask |= ACE_READ_DATA; 730 return (new_mask); 731 } 732 733 static void 734 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask, 735 uint16_t access_type, uint64_t fuid, uint16_t entry_type) 736 { 737 uint16_t type = entry_type & ACE_TYPE_FLAGS; 738 739 aclp->z_ops.ace_mask_set(acep, access_mask); 740 aclp->z_ops.ace_type_set(acep, access_type); 741 aclp->z_ops.ace_flags_set(acep, entry_type); 742 if ((type != ACE_OWNER && type != (ACE_GROUP | ACE_IDENTIFIER_GROUP) && 743 type != ACE_EVERYONE)) 744 aclp->z_ops.ace_who_set(acep, fuid); 745 } 746 747 /* 748 * Determine mode of file based on ACL. 749 * Also, create FUIDs for any User/Group ACEs 750 */ 751 static uint64_t 752 zfs_mode_fuid_compute(znode_t *zp, zfs_acl_t *aclp, zfs_fuid_info_t **fuidp, 753 dmu_tx_t *tx) 754 { 755 int entry_type; 756 mode_t mode; 757 mode_t seen = 0; 758 zfs_ace_hdr_t *acep = NULL; 759 uint64_t who; 760 uint16_t iflags, type; 761 uint32_t access_mask; 762 763 mode = (zp->z_phys->zp_mode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX)); 764 765 while (acep = zfs_acl_next_ace(aclp, acep, &who, 766 &access_mask, &iflags, &type)) { 767 entry_type = (iflags & ACE_TYPE_FLAGS); 768 769 /* 770 * Skip over inherit only ACEs 771 */ 772 if (entry_type == ACE_INHERIT_ONLY_ACE) 773 continue; 774 775 if (entry_type == ACE_OWNER) { 776 if ((access_mask & ACE_READ_DATA) && 777 (!(seen & S_IRUSR))) { 778 seen |= S_IRUSR; 779 if (type == ALLOW) { 780 mode |= S_IRUSR; 781 } 782 } 783 if ((access_mask & ACE_WRITE_DATA) && 784 (!(seen & S_IWUSR))) { 785 seen |= S_IWUSR; 786 if (type == ALLOW) { 787 mode |= S_IWUSR; 788 } 789 } 790 if ((access_mask & ACE_EXECUTE) && 791 (!(seen & S_IXUSR))) { 792 seen |= S_IXUSR; 793 if (type == ALLOW) { 794 mode |= S_IXUSR; 795 } 796 } 797 } else if (entry_type == OWNING_GROUP) { 798 if ((access_mask & ACE_READ_DATA) && 799 (!(seen & S_IRGRP))) { 800 seen |= S_IRGRP; 801 if (type == ALLOW) { 802 mode |= S_IRGRP; 803 } 804 } 805 if ((access_mask & ACE_WRITE_DATA) && 806 (!(seen & S_IWGRP))) { 807 seen |= S_IWGRP; 808 if (type == ALLOW) { 809 mode |= S_IWGRP; 810 } 811 } 812 if ((access_mask & ACE_EXECUTE) && 813 (!(seen & S_IXGRP))) { 814 seen |= S_IXGRP; 815 if (type == ALLOW) { 816 mode |= S_IXGRP; 817 } 818 } 819 } else if (entry_type == ACE_EVERYONE) { 820 if ((access_mask & ACE_READ_DATA)) { 821 if (!(seen & S_IRUSR)) { 822 seen |= S_IRUSR; 823 if (type == ALLOW) { 824 mode |= S_IRUSR; 825 } 826 } 827 if (!(seen & S_IRGRP)) { 828 seen |= S_IRGRP; 829 if (type == ALLOW) { 830 mode |= S_IRGRP; 831 } 832 } 833 if (!(seen & S_IROTH)) { 834 seen |= S_IROTH; 835 if (type == ALLOW) { 836 mode |= S_IROTH; 837 } 838 } 839 } 840 if ((access_mask & ACE_WRITE_DATA)) { 841 if (!(seen & S_IWUSR)) { 842 seen |= S_IWUSR; 843 if (type == ALLOW) { 844 mode |= S_IWUSR; 845 } 846 } 847 if (!(seen & S_IWGRP)) { 848 seen |= S_IWGRP; 849 if (type == ALLOW) { 850 mode |= S_IWGRP; 851 } 852 } 853 if (!(seen & S_IWOTH)) { 854 seen |= S_IWOTH; 855 if (type == ALLOW) { 856 mode |= S_IWOTH; 857 } 858 } 859 } 860 if ((access_mask & ACE_EXECUTE)) { 861 if (!(seen & S_IXUSR)) { 862 seen |= S_IXUSR; 863 if (type == ALLOW) { 864 mode |= S_IXUSR; 865 } 866 } 867 if (!(seen & S_IXGRP)) { 868 seen |= S_IXGRP; 869 if (type == ALLOW) { 870 mode |= S_IXGRP; 871 } 872 } 873 if (!(seen & S_IXOTH)) { 874 seen |= S_IXOTH; 875 if (type == ALLOW) { 876 mode |= S_IXOTH; 877 } 878 } 879 } 880 } 881 /* 882 * Now handle FUID create for user/group ACEs 883 */ 884 if (entry_type == 0 || entry_type == ACE_IDENTIFIER_GROUP) { 885 aclp->z_ops.ace_who_set(acep, 886 zfs_fuid_create(zp->z_zfsvfs, who, 887 entry_type == 0 ? ZFS_ACE_USER : ZFS_ACE_GROUP, tx, 888 fuidp)); 889 } 890 } 891 return (mode); 892 } 893 894 static zfs_acl_t * 895 zfs_acl_node_read_internal(znode_t *zp, boolean_t will_modify) 896 { 897 zfs_acl_t *aclp; 898 zfs_acl_node_t *aclnode; 899 900 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 901 902 /* 903 * Version 0 to 1 znode_acl_phys has the size/count fields swapped. 904 * Version 0 didn't have a size field, only a count. 905 */ 906 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 907 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_size; 908 aclp->z_acl_bytes = ZFS_ACL_SIZE(aclp->z_acl_count); 909 } else { 910 aclp->z_acl_count = zp->z_phys->zp_acl.z_acl_count; 911 aclp->z_acl_bytes = zp->z_phys->zp_acl.z_acl_size; 912 } 913 914 aclnode = zfs_acl_node_alloc(will_modify ? aclp->z_acl_bytes : 0); 915 aclnode->z_ace_count = aclp->z_acl_count; 916 if (will_modify) { 917 bcopy(zp->z_phys->zp_acl.z_ace_data, aclnode->z_acldata, 918 aclp->z_acl_bytes); 919 } else { 920 aclnode->z_size = aclp->z_acl_bytes; 921 aclnode->z_acldata = &zp->z_phys->zp_acl.z_ace_data[0]; 922 } 923 924 list_insert_head(&aclp->z_acl, aclnode); 925 926 return (aclp); 927 } 928 929 /* 930 * Read an external acl object. 931 */ 932 static int 933 zfs_acl_node_read(znode_t *zp, zfs_acl_t **aclpp, boolean_t will_modify) 934 { 935 uint64_t extacl = zp->z_phys->zp_acl.z_acl_extern_obj; 936 zfs_acl_t *aclp; 937 size_t aclsize; 938 size_t acl_count; 939 zfs_acl_node_t *aclnode; 940 int error; 941 942 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 943 944 if (zp->z_phys->zp_acl.z_acl_extern_obj == 0) { 945 *aclpp = zfs_acl_node_read_internal(zp, will_modify); 946 return (0); 947 } 948 949 aclp = zfs_acl_alloc(zp->z_phys->zp_acl.z_acl_version); 950 if (zp->z_phys->zp_acl.z_acl_version == ZFS_ACL_VERSION_INITIAL) { 951 zfs_acl_phys_v0_t *zacl0 = 952 (zfs_acl_phys_v0_t *)&zp->z_phys->zp_acl; 953 954 aclsize = ZFS_ACL_SIZE(zacl0->z_acl_count); 955 acl_count = zacl0->z_acl_count; 956 } else { 957 aclsize = zp->z_phys->zp_acl.z_acl_size; 958 acl_count = zp->z_phys->zp_acl.z_acl_count; 959 if (aclsize == 0) 960 aclsize = acl_count * sizeof (zfs_ace_t); 961 } 962 aclnode = zfs_acl_node_alloc(aclsize); 963 list_insert_head(&aclp->z_acl, aclnode); 964 error = dmu_read(zp->z_zfsvfs->z_os, extacl, 0, 965 aclsize, aclnode->z_acldata); 966 aclnode->z_ace_count = acl_count; 967 aclp->z_acl_count = acl_count; 968 aclp->z_acl_bytes = aclsize; 969 970 if (error != 0) { 971 zfs_acl_free(aclp); 972 return (error); 973 } 974 975 *aclpp = aclp; 976 return (0); 977 } 978 979 /* 980 * common code for setting ACLs. 981 * 982 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl. 983 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's 984 * already checked the acl and knows whether to inherit. 985 */ 986 int 987 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, zfs_fuid_info_t **fuidp, 988 dmu_tx_t *tx) 989 { 990 int error; 991 znode_phys_t *zphys = zp->z_phys; 992 zfs_acl_phys_t *zacl = &zphys->zp_acl; 993 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 994 uint64_t aoid = zphys->zp_acl.z_acl_extern_obj; 995 uint64_t off = 0; 996 dmu_object_type_t otype; 997 zfs_acl_node_t *aclnode; 998 999 ASSERT(MUTEX_HELD(&zp->z_lock)); 1000 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1001 1002 dmu_buf_will_dirty(zp->z_dbuf, tx); 1003 1004 zphys->zp_mode = zfs_mode_fuid_compute(zp, aclp, fuidp, tx); 1005 1006 /* 1007 * Decide which opbject type to use. If we are forced to 1008 * use old ACL format than transform ACL into zfs_oldace_t 1009 * layout. 1010 */ 1011 if (!zfsvfs->z_use_fuids) { 1012 otype = DMU_OT_OLDACL; 1013 } else { 1014 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) && 1015 (zfsvfs->z_version >= ZPL_VERSION_FUID)) 1016 zfs_acl_xform(zp, aclp); 1017 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID); 1018 otype = DMU_OT_ACL; 1019 } 1020 1021 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1022 /* 1023 * If ACL was previously external and we are now 1024 * converting to new ACL format then release old 1025 * ACL object and create a new one. 1026 */ 1027 if (aoid && aclp->z_version != zacl->z_acl_version) { 1028 error = dmu_object_free(zfsvfs->z_os, 1029 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1030 if (error) 1031 return (error); 1032 aoid = 0; 1033 } 1034 if (aoid == 0) { 1035 aoid = dmu_object_alloc(zfsvfs->z_os, 1036 otype, aclp->z_acl_bytes, 1037 otype == DMU_OT_ACL ? DMU_OT_SYSACL : DMU_OT_NONE, 1038 otype == DMU_OT_ACL ? DN_MAX_BONUSLEN : 0, tx); 1039 } else { 1040 (void) dmu_object_set_blocksize(zfsvfs->z_os, aoid, 1041 aclp->z_acl_bytes, 0, tx); 1042 } 1043 zphys->zp_acl.z_acl_extern_obj = aoid; 1044 for (aclnode = list_head(&aclp->z_acl); aclnode; 1045 aclnode = list_next(&aclp->z_acl, aclnode)) { 1046 if (aclnode->z_ace_count == 0) 1047 continue; 1048 dmu_write(zfsvfs->z_os, aoid, off, 1049 aclnode->z_size, aclnode->z_acldata, tx); 1050 off += aclnode->z_size; 1051 } 1052 } else { 1053 void *start = zacl->z_ace_data; 1054 /* 1055 * Migrating back embedded? 1056 */ 1057 if (zphys->zp_acl.z_acl_extern_obj) { 1058 error = dmu_object_free(zfsvfs->z_os, 1059 zp->z_phys->zp_acl.z_acl_extern_obj, tx); 1060 if (error) 1061 return (error); 1062 zphys->zp_acl.z_acl_extern_obj = 0; 1063 } 1064 1065 for (aclnode = list_head(&aclp->z_acl); aclnode; 1066 aclnode = list_next(&aclp->z_acl, aclnode)) { 1067 if (aclnode->z_ace_count == 0) 1068 continue; 1069 bcopy(aclnode->z_acldata, start, aclnode->z_size); 1070 start = (caddr_t)start + aclnode->z_size; 1071 } 1072 } 1073 1074 /* 1075 * If Old version then swap count/bytes to match old 1076 * layout of znode_acl_phys_t. 1077 */ 1078 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1079 zphys->zp_acl.z_acl_size = aclp->z_acl_count; 1080 zphys->zp_acl.z_acl_count = aclp->z_acl_bytes; 1081 } else { 1082 zphys->zp_acl.z_acl_size = aclp->z_acl_bytes; 1083 zphys->zp_acl.z_acl_count = aclp->z_acl_count; 1084 } 1085 1086 zphys->zp_acl.z_acl_version = aclp->z_version; 1087 1088 /* 1089 * Replace ACL wide bits, but first clear them. 1090 */ 1091 zp->z_phys->zp_flags &= ~ZFS_ACL_WIDE_FLAGS; 1092 1093 zp->z_phys->zp_flags |= aclp->z_hints; 1094 1095 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0) 1096 zp->z_phys->zp_flags |= ZFS_ACL_TRIVIAL; 1097 1098 zfs_time_stamper_locked(zp, STATE_CHANGED, tx); 1099 return (0); 1100 } 1101 1102 /* 1103 * Remove ACE from aclp 1104 */ 1105 static void 1106 zfs_ace_remove(zfs_acl_t *aclp, void *acep) 1107 { 1108 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1109 size_t length; 1110 1111 /* 1112 * If first entry then just alter acldata ptr 1113 * 1114 * Otherwise split node in two 1115 */ 1116 if (currnode->z_ace_count > 1) { 1117 length = currnode->z_size - ((caddr_t)aclp->z_next_ace - 1118 (caddr_t)currnode->z_acldata); 1119 (void) memmove(acep, aclp->z_next_ace, length); 1120 currnode->z_size = currnode->z_size - 1121 aclp->z_ops.ace_size(acep); 1122 aclp->z_next_ace = acep; 1123 aclp->z_acl_bytes -= ((caddr_t)aclp->z_next_ace - 1124 (caddr_t)currnode->z_acldata); 1125 } else { 1126 list_remove(&aclp->z_acl, currnode); 1127 aclp->z_next_ace = NULL; 1128 aclp->z_acl_bytes = 0; 1129 } 1130 currnode->z_ace_count--; 1131 currnode->z_ace_idx--; 1132 aclp->z_acl_count--; 1133 } 1134 1135 /* 1136 * Update access mask for prepended ACE 1137 * 1138 * This applies the "groupmask" value for aclmode property. 1139 */ 1140 static void 1141 zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep, 1142 mode_t mode, uint64_t owner) 1143 { 1144 int rmask, wmask, xmask; 1145 int user_ace; 1146 uint16_t aceflags; 1147 uint32_t origmask, acepmask; 1148 uint64_t fuid; 1149 1150 aceflags = aclp->z_ops.ace_flags_get(acep); 1151 fuid = aclp->z_ops.ace_who_get(acep); 1152 origmask = aclp->z_ops.ace_mask_get(origacep); 1153 acepmask = aclp->z_ops.ace_mask_get(acep); 1154 1155 user_ace = (!(aceflags & 1156 (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP))); 1157 1158 if (user_ace && (fuid == owner)) { 1159 rmask = S_IRUSR; 1160 wmask = S_IWUSR; 1161 xmask = S_IXUSR; 1162 } else { 1163 rmask = S_IRGRP; 1164 wmask = S_IWGRP; 1165 xmask = S_IXGRP; 1166 } 1167 1168 if (origmask & ACE_READ_DATA) { 1169 if (mode & rmask) { 1170 acepmask &= ~ACE_READ_DATA; 1171 } else { 1172 acepmask |= ACE_READ_DATA; 1173 } 1174 } 1175 1176 if (origmask & ACE_WRITE_DATA) { 1177 if (mode & wmask) { 1178 acepmask &= ~ACE_WRITE_DATA; 1179 } else { 1180 acepmask |= ACE_WRITE_DATA; 1181 } 1182 } 1183 1184 if (origmask & ACE_APPEND_DATA) { 1185 if (mode & wmask) { 1186 acepmask &= ~ACE_APPEND_DATA; 1187 } else { 1188 acepmask |= ACE_APPEND_DATA; 1189 } 1190 } 1191 1192 if (origmask & ACE_EXECUTE) { 1193 if (mode & xmask) { 1194 acepmask &= ~ACE_EXECUTE; 1195 } else { 1196 acepmask |= ACE_EXECUTE; 1197 } 1198 } 1199 aclp->z_ops.ace_mask_set(acep, acepmask); 1200 } 1201 1202 /* 1203 * Apply mode to canonical six ACEs. 1204 */ 1205 static void 1206 zfs_acl_fixup_canonical_six(zfs_acl_t *aclp, mode_t mode) 1207 { 1208 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1209 void *acep; 1210 int maskoff = aclp->z_ops.ace_mask_off(); 1211 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1212 1213 ASSERT(aclnode != NULL); 1214 1215 acep = (void *)((caddr_t)aclnode->z_acldata + 1216 aclnode->z_size - (abstract_size * 6)); 1217 1218 /* 1219 * Fixup final ACEs to match the mode 1220 */ 1221 1222 adjust_ace_pair_common(acep, maskoff, abstract_size, 1223 (mode & 0700) >> 6); /* owner@ */ 1224 1225 acep = (caddr_t)acep + (abstract_size * 2); 1226 1227 adjust_ace_pair_common(acep, maskoff, abstract_size, 1228 (mode & 0070) >> 3); /* group@ */ 1229 1230 acep = (caddr_t)acep + (abstract_size * 2); 1231 adjust_ace_pair_common(acep, maskoff, 1232 abstract_size, mode); /* everyone@ */ 1233 } 1234 1235 1236 static int 1237 zfs_acl_ace_match(zfs_acl_t *aclp, void *acep, int allow_deny, 1238 int entry_type, int accessmask) 1239 { 1240 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1241 uint16_t type = aclp->z_ops.ace_type_get(acep); 1242 uint16_t flags = aclp->z_ops.ace_flags_get(acep); 1243 1244 return (mask == accessmask && type == allow_deny && 1245 ((flags & ACE_TYPE_FLAGS) == entry_type)); 1246 } 1247 1248 /* 1249 * Can prepended ACE be reused? 1250 */ 1251 static int 1252 zfs_reuse_deny(zfs_acl_t *aclp, void *acep, void *prevacep) 1253 { 1254 int okay_masks; 1255 uint16_t prevtype; 1256 uint16_t prevflags; 1257 uint16_t flags; 1258 uint32_t mask, prevmask; 1259 1260 if (prevacep == NULL) 1261 return (B_FALSE); 1262 1263 prevtype = aclp->z_ops.ace_type_get(prevacep); 1264 prevflags = aclp->z_ops.ace_flags_get(prevacep); 1265 flags = aclp->z_ops.ace_flags_get(acep); 1266 mask = aclp->z_ops.ace_mask_get(acep); 1267 prevmask = aclp->z_ops.ace_mask_get(prevacep); 1268 1269 if (prevtype != DENY) 1270 return (B_FALSE); 1271 1272 if (prevflags != (flags & ACE_IDENTIFIER_GROUP)) 1273 return (B_FALSE); 1274 1275 okay_masks = (mask & OKAY_MASK_BITS); 1276 1277 if (prevmask & ~okay_masks) 1278 return (B_FALSE); 1279 1280 return (B_TRUE); 1281 } 1282 1283 1284 /* 1285 * Insert new ACL node into chain of zfs_acl_node_t's 1286 * 1287 * This will result in two possible results. 1288 * 1. If the ACL is currently just a single zfs_acl_node and 1289 * we are prepending the entry then current acl node will have 1290 * a new node inserted above it. 1291 * 1292 * 2. If we are inserting in the middle of current acl node then 1293 * the current node will be split in two and new node will be inserted 1294 * in between the two split nodes. 1295 */ 1296 static zfs_acl_node_t * 1297 zfs_acl_ace_insert(zfs_acl_t *aclp, void *acep) 1298 { 1299 zfs_acl_node_t *newnode; 1300 zfs_acl_node_t *trailernode = NULL; 1301 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1302 int curr_idx = aclp->z_curr_node->z_ace_idx; 1303 int trailer_count; 1304 size_t oldsize; 1305 1306 newnode = zfs_acl_node_alloc(aclp->z_ops.ace_size(acep)); 1307 newnode->z_ace_count = 1; 1308 1309 oldsize = currnode->z_size; 1310 1311 if (curr_idx != 1) { 1312 trailernode = zfs_acl_node_alloc(0); 1313 trailernode->z_acldata = acep; 1314 1315 trailer_count = currnode->z_ace_count - curr_idx + 1; 1316 currnode->z_ace_count = curr_idx - 1; 1317 currnode->z_size = (caddr_t)acep - (caddr_t)currnode->z_acldata; 1318 trailernode->z_size = oldsize - currnode->z_size; 1319 trailernode->z_ace_count = trailer_count; 1320 } 1321 1322 aclp->z_acl_count += 1; 1323 aclp->z_acl_bytes += aclp->z_ops.ace_size(acep); 1324 1325 if (curr_idx == 1) 1326 list_insert_before(&aclp->z_acl, currnode, newnode); 1327 else 1328 list_insert_after(&aclp->z_acl, currnode, newnode); 1329 if (trailernode) { 1330 list_insert_after(&aclp->z_acl, newnode, trailernode); 1331 aclp->z_curr_node = trailernode; 1332 trailernode->z_ace_idx = 1; 1333 } 1334 1335 return (newnode); 1336 } 1337 1338 /* 1339 * Prepend deny ACE 1340 */ 1341 static void * 1342 zfs_acl_prepend_deny(znode_t *zp, zfs_acl_t *aclp, void *acep, 1343 mode_t mode) 1344 { 1345 zfs_acl_node_t *aclnode; 1346 void *newacep; 1347 uint64_t fuid; 1348 uint16_t flags; 1349 1350 aclnode = zfs_acl_ace_insert(aclp, acep); 1351 newacep = aclnode->z_acldata; 1352 fuid = aclp->z_ops.ace_who_get(acep); 1353 flags = aclp->z_ops.ace_flags_get(acep); 1354 zfs_set_ace(aclp, newacep, 0, DENY, fuid, (flags & ACE_TYPE_FLAGS)); 1355 zfs_acl_prepend_fixup(aclp, newacep, acep, mode, zp->z_phys->zp_uid); 1356 1357 return (newacep); 1358 } 1359 1360 /* 1361 * Split an inherited ACE into inherit_only ACE 1362 * and original ACE with inheritance flags stripped off. 1363 */ 1364 static void 1365 zfs_acl_split_ace(zfs_acl_t *aclp, zfs_ace_hdr_t *acep) 1366 { 1367 zfs_acl_node_t *aclnode; 1368 zfs_acl_node_t *currnode = zfs_acl_curr_node(aclp); 1369 void *newacep; 1370 uint16_t type, flags; 1371 uint32_t mask; 1372 uint64_t fuid; 1373 1374 type = aclp->z_ops.ace_type_get(acep); 1375 flags = aclp->z_ops.ace_flags_get(acep); 1376 mask = aclp->z_ops.ace_mask_get(acep); 1377 fuid = aclp->z_ops.ace_who_get(acep); 1378 1379 aclnode = zfs_acl_ace_insert(aclp, acep); 1380 newacep = aclnode->z_acldata; 1381 1382 aclp->z_ops.ace_type_set(newacep, type); 1383 aclp->z_ops.ace_flags_set(newacep, flags | ACE_INHERIT_ONLY_ACE); 1384 aclp->z_ops.ace_mask_set(newacep, mask); 1385 aclp->z_ops.ace_type_set(newacep, type); 1386 aclp->z_ops.ace_who_set(newacep, fuid); 1387 aclp->z_next_ace = acep; 1388 flags &= ~ALL_INHERIT; 1389 aclp->z_ops.ace_flags_set(acep, flags); 1390 currnode->z_ace_idx -= 1; 1391 } 1392 1393 /* 1394 * Are ACES started at index i, the canonical six ACES? 1395 */ 1396 static int 1397 zfs_have_canonical_six(zfs_acl_t *aclp) 1398 { 1399 void *acep; 1400 zfs_acl_node_t *aclnode = list_tail(&aclp->z_acl); 1401 int i = 0; 1402 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1403 1404 ASSERT(aclnode != NULL); 1405 1406 if (aclnode->z_ace_count < 6) 1407 return (0); 1408 1409 acep = (void *)((caddr_t)aclnode->z_acldata + 1410 aclnode->z_size - (aclp->z_ops.ace_abstract_size() * 6)); 1411 1412 if ((zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1413 DENY, ACE_OWNER, 0) && 1414 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1415 ALLOW, ACE_OWNER, OWNER_ALLOW_MASK) && 1416 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), DENY, 1417 OWNING_GROUP, 0) && zfs_acl_ace_match(aclp, (caddr_t)acep + 1418 (abstract_size * i++), 1419 ALLOW, OWNING_GROUP, 0) && 1420 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1421 DENY, ACE_EVERYONE, EVERYONE_DENY_MASK) && 1422 zfs_acl_ace_match(aclp, (caddr_t)acep + (abstract_size * i++), 1423 ALLOW, ACE_EVERYONE, EVERYONE_ALLOW_MASK))) { 1424 return (1); 1425 } else { 1426 return (0); 1427 } 1428 } 1429 1430 1431 /* 1432 * Apply step 1g, to group entries 1433 * 1434 * Need to deal with corner case where group may have 1435 * greater permissions than owner. If so then limit 1436 * group permissions, based on what extra permissions 1437 * group has. 1438 */ 1439 static void 1440 zfs_fixup_group_entries(zfs_acl_t *aclp, void *acep, void *prevacep, 1441 mode_t mode) 1442 { 1443 uint32_t prevmask = aclp->z_ops.ace_mask_get(prevacep); 1444 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1445 uint16_t prevflags = aclp->z_ops.ace_flags_get(prevacep); 1446 mode_t extramode = (mode >> 3) & 07; 1447 mode_t ownermode = (mode >> 6); 1448 1449 if (prevflags & ACE_IDENTIFIER_GROUP) { 1450 1451 extramode &= ~ownermode; 1452 1453 if (extramode) { 1454 if (extramode & S_IROTH) { 1455 prevmask &= ~ACE_READ_DATA; 1456 mask &= ~ACE_READ_DATA; 1457 } 1458 if (extramode & S_IWOTH) { 1459 prevmask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1460 mask &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 1461 } 1462 if (extramode & S_IXOTH) { 1463 prevmask &= ~ACE_EXECUTE; 1464 mask &= ~ACE_EXECUTE; 1465 } 1466 } 1467 } 1468 aclp->z_ops.ace_mask_set(acep, mask); 1469 aclp->z_ops.ace_mask_set(prevacep, prevmask); 1470 } 1471 1472 /* 1473 * Apply the chmod algorithm as described 1474 * in PSARC/2002/240 1475 */ 1476 static int 1477 zfs_acl_chmod(znode_t *zp, uint64_t mode, zfs_acl_t *aclp, 1478 dmu_tx_t *tx) 1479 { 1480 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1481 void *acep = NULL, *prevacep = NULL; 1482 uint64_t who; 1483 int i; 1484 int error; 1485 int entry_type; 1486 int reuse_deny; 1487 int need_canonical_six = 1; 1488 uint16_t iflags, type; 1489 uint32_t access_mask; 1490 1491 ASSERT(MUTEX_HELD(&zp->z_acl_lock)); 1492 ASSERT(MUTEX_HELD(&zp->z_lock)); 1493 1494 aclp->z_hints = (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 1495 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 1496 &iflags, &type)) { 1497 1498 entry_type = (iflags & ACE_TYPE_FLAGS); 1499 iflags = (iflags & ALL_INHERIT); 1500 1501 if ((type != ALLOW && type != DENY) || 1502 (iflags & ACE_INHERIT_ONLY_ACE)) { 1503 if (iflags) 1504 aclp->z_hints |= ZFS_INHERIT_ACE; 1505 switch (type) { 1506 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1507 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1508 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1509 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1510 aclp->z_hints |= ZFS_ACL_OBJ_ACE; 1511 break; 1512 } 1513 goto nextace; 1514 } 1515 1516 if (zfsvfs->z_acl_mode == ZFS_ACL_DISCARD) { 1517 zfs_ace_remove(aclp, acep); 1518 goto nextace; 1519 } 1520 /* 1521 * Need to split ace into two? 1522 */ 1523 if ((iflags & (ACE_FILE_INHERIT_ACE| 1524 ACE_DIRECTORY_INHERIT_ACE)) && 1525 (!(iflags & ACE_INHERIT_ONLY_ACE))) { 1526 zfs_acl_split_ace(aclp, acep); 1527 aclp->z_hints |= ZFS_INHERIT_ACE; 1528 goto nextace; 1529 } 1530 1531 if (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE || 1532 (entry_type == OWNING_GROUP)) { 1533 access_mask &= ~OGE_CLEAR; 1534 aclp->z_ops.ace_mask_set(acep, access_mask); 1535 goto nextace; 1536 } else { 1537 reuse_deny = B_TRUE; 1538 if (type == ALLOW) { 1539 1540 /* 1541 * Check preceding ACE if any, to see 1542 * if we need to prepend a DENY ACE. 1543 * This is only applicable when the acl_mode 1544 * property == groupmask. 1545 */ 1546 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK) { 1547 1548 reuse_deny = zfs_reuse_deny(aclp, acep, 1549 prevacep); 1550 1551 if (reuse_deny == B_FALSE) { 1552 prevacep = 1553 zfs_acl_prepend_deny(zp, 1554 aclp, acep, mode); 1555 } else { 1556 zfs_acl_prepend_fixup( 1557 aclp, prevacep, 1558 acep, mode, 1559 zp->z_phys->zp_uid); 1560 } 1561 zfs_fixup_group_entries(aclp, acep, 1562 prevacep, mode); 1563 1564 } 1565 } 1566 } 1567 nextace: 1568 prevacep = acep; 1569 } 1570 1571 /* 1572 * Check out last six aces, if we have six. 1573 */ 1574 1575 if (aclp->z_acl_count >= 6) { 1576 if (zfs_have_canonical_six(aclp)) { 1577 need_canonical_six = 0; 1578 } 1579 } 1580 1581 if (need_canonical_six) { 1582 size_t abstract_size = aclp->z_ops.ace_abstract_size(); 1583 void *zacep; 1584 zfs_acl_node_t *aclnode = 1585 zfs_acl_node_alloc(abstract_size * 6); 1586 1587 aclnode->z_size = abstract_size * 6; 1588 aclnode->z_ace_count = 6; 1589 aclp->z_acl_bytes += aclnode->z_size; 1590 list_insert_tail(&aclp->z_acl, aclnode); 1591 1592 zacep = aclnode->z_acldata; 1593 1594 i = 0; 1595 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1596 0, DENY, -1, ACE_OWNER); 1597 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1598 OWNER_ALLOW_MASK, ALLOW, -1, ACE_OWNER); 1599 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1600 DENY, -1, OWNING_GROUP); 1601 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 0, 1602 ALLOW, -1, OWNING_GROUP); 1603 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1604 EVERYONE_DENY_MASK, DENY, -1, ACE_EVERYONE); 1605 zfs_set_ace(aclp, (caddr_t)zacep + (abstract_size * i++), 1606 EVERYONE_ALLOW_MASK, ALLOW, -1, ACE_EVERYONE); 1607 aclp->z_acl_count += 6; 1608 } 1609 1610 zfs_acl_fixup_canonical_six(aclp, mode); 1611 zp->z_phys->zp_mode = mode; 1612 error = zfs_aclset_common(zp, aclp, NULL, tx); 1613 return (error); 1614 } 1615 1616 int 1617 zfs_acl_chmod_setattr(znode_t *zp, uint64_t mode, dmu_tx_t *tx) 1618 { 1619 zfs_acl_t *aclp = NULL; 1620 int error; 1621 1622 ASSERT(MUTEX_HELD(&zp->z_lock)); 1623 mutex_enter(&zp->z_acl_lock); 1624 error = zfs_acl_node_read(zp, &aclp, B_TRUE); 1625 if (error == 0) 1626 error = zfs_acl_chmod(zp, mode, aclp, tx); 1627 mutex_exit(&zp->z_acl_lock); 1628 if (aclp) 1629 zfs_acl_free(aclp); 1630 return (error); 1631 } 1632 1633 /* 1634 * strip off write_owner and write_acl 1635 */ 1636 static void 1637 zfs_securemode_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep) 1638 { 1639 uint32_t mask = aclp->z_ops.ace_mask_get(acep); 1640 1641 if ((zfsvfs->z_acl_inherit == ZFS_ACL_SECURE) && 1642 (aclp->z_ops.ace_type_get(acep) == ALLOW)) { 1643 mask &= ~SECURE_CLEAR; 1644 aclp->z_ops.ace_mask_set(acep, mask); 1645 } 1646 } 1647 1648 /* 1649 * Should ACE be inherited? 1650 */ 1651 static int 1652 zfs_ace_can_use(znode_t *zp, uint16_t acep_flags) 1653 { 1654 int vtype = ZTOV(zp)->v_type; 1655 int iflags = (acep_flags & 0xf); 1656 1657 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE)) 1658 return (1); 1659 else if (iflags & ACE_FILE_INHERIT_ACE) 1660 return (!((vtype == VDIR) && 1661 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE))); 1662 return (0); 1663 } 1664 1665 /* 1666 * inherit inheritable ACEs from parent 1667 */ 1668 static zfs_acl_t * 1669 zfs_acl_inherit(znode_t *zp, zfs_acl_t *paclp) 1670 { 1671 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1672 void *pacep; 1673 void *acep, *acep2; 1674 zfs_acl_node_t *aclnode, *aclnode2; 1675 zfs_acl_t *aclp = NULL; 1676 uint64_t who; 1677 uint32_t access_mask; 1678 uint16_t iflags, newflags, type; 1679 size_t ace_size; 1680 void *data1, *data2; 1681 size_t data1sz, data2sz; 1682 1683 pacep = NULL; 1684 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1685 if (zfsvfs->z_acl_inherit != ZFS_ACL_DISCARD) { 1686 while (pacep = zfs_acl_next_ace(paclp, pacep, &who, 1687 &access_mask, &iflags, &type)) { 1688 1689 if (zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW && 1690 type == ALLOW) 1691 continue; 1692 1693 ace_size = aclp->z_ops.ace_size(pacep); 1694 1695 if (zfs_ace_can_use(zp, iflags)) { 1696 aclnode = 1697 zfs_acl_node_alloc(ace_size); 1698 1699 list_insert_tail(&aclp->z_acl, aclnode); 1700 acep = aclnode->z_acldata; 1701 zfs_set_ace(aclp, acep, access_mask, type, 1702 who, iflags|ACE_INHERITED_ACE); 1703 1704 /* 1705 * Copy special opaque data if any 1706 */ 1707 if ((data1sz = paclp->z_ops.ace_data(pacep, 1708 &data1)) != 0) { 1709 VERIFY((data2sz = 1710 aclp->z_ops.ace_data(acep, 1711 &data2)) == data1sz); 1712 bcopy(data1, data2, data2sz); 1713 } 1714 aclp->z_acl_count++; 1715 aclnode->z_ace_count++; 1716 aclp->z_acl_bytes += aclnode->z_size; 1717 newflags = aclp->z_ops.ace_flags_get(acep); 1718 if ((iflags & 1719 ACE_NO_PROPAGATE_INHERIT_ACE) || 1720 (ZTOV(zp)->v_type != VDIR)) { 1721 newflags &= ~ALL_INHERIT; 1722 aclp->z_ops.ace_flags_set(acep, 1723 newflags|ACE_INHERITED_ACE); 1724 zfs_securemode_update(zfsvfs, 1725 aclp, acep); 1726 continue; 1727 } 1728 1729 ASSERT(ZTOV(zp)->v_type == VDIR); 1730 1731 newflags = aclp->z_ops.ace_flags_get(acep); 1732 if ((iflags & (ACE_FILE_INHERIT_ACE | 1733 ACE_DIRECTORY_INHERIT_ACE)) != 1734 ACE_FILE_INHERIT_ACE) { 1735 aclnode2 = zfs_acl_node_alloc(ace_size); 1736 list_insert_tail(&aclp->z_acl, 1737 aclnode2); 1738 acep2 = aclnode2->z_acldata; 1739 zfs_set_ace(aclp, acep2, 1740 access_mask, type, who, 1741 iflags|ACE_INHERITED_ACE); 1742 newflags |= ACE_INHERIT_ONLY_ACE; 1743 aclp->z_ops.ace_flags_set(acep, 1744 newflags); 1745 newflags &= ~ALL_INHERIT; 1746 aclp->z_ops.ace_flags_set(acep2, 1747 newflags|ACE_INHERITED_ACE); 1748 1749 /* 1750 * Copy special opaque data if any 1751 */ 1752 if ((data1sz = 1753 aclp->z_ops.ace_data(acep, 1754 &data1)) != 0) { 1755 VERIFY((data2sz = 1756 aclp->z_ops.ace_data(acep2, 1757 &data2)) == data1sz); 1758 bcopy(data1, data2, data1sz); 1759 } 1760 aclp->z_acl_count++; 1761 aclnode2->z_ace_count++; 1762 aclp->z_acl_bytes += aclnode->z_size; 1763 zfs_securemode_update(zfsvfs, 1764 aclp, acep2); 1765 } else { 1766 newflags |= ACE_INHERIT_ONLY_ACE; 1767 aclp->z_ops.ace_flags_set(acep, 1768 newflags|ACE_INHERITED_ACE); 1769 } 1770 1771 } 1772 } 1773 } 1774 return (aclp); 1775 } 1776 1777 /* 1778 * Create file system object initial permissions 1779 * including inheritable ACEs. 1780 */ 1781 void 1782 zfs_perm_init(znode_t *zp, znode_t *parent, int flag, 1783 vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 1784 zfs_acl_t *setaclp, zfs_fuid_info_t **fuidp) 1785 { 1786 uint64_t mode; 1787 uint64_t uid; 1788 uint64_t gid; 1789 int error; 1790 int pull_down; 1791 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1792 zfs_acl_t *aclp = NULL; 1793 zfs_acl_t *paclp; 1794 xvattr_t *xvap = (xvattr_t *)vap; 1795 1796 if (setaclp) 1797 aclp = setaclp; 1798 1799 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1800 1801 /* 1802 * Determine uid and gid. 1803 */ 1804 if ((flag & (IS_ROOT_NODE | IS_REPLAY)) || 1805 ((flag & IS_XATTR) && (vap->va_type == VDIR))) { 1806 uid = zfs_fuid_create(zfsvfs, vap->va_uid, 1807 ZFS_OWNER, tx, fuidp); 1808 gid = zfs_fuid_create(zfsvfs, vap->va_gid, 1809 ZFS_GROUP, tx, fuidp); 1810 } else { 1811 uid = zfs_fuid_create_cred(zfsvfs, crgetuid(cr), 1812 ZFS_OWNER, tx, cr, fuidp); 1813 if ((vap->va_mask & AT_GID) && 1814 ((vap->va_gid == parent->z_phys->zp_gid) || 1815 groupmember(vap->va_gid, cr) || 1816 secpolicy_vnode_create_gid(cr) == 0)) { 1817 gid = zfs_fuid_create_cred(zfsvfs, vap->va_gid, 1818 ZFS_GROUP, tx, cr, fuidp); 1819 } else { 1820 gid = (parent->z_phys->zp_mode & S_ISGID) ? 1821 parent->z_phys->zp_gid : crgetgid(cr); 1822 gid = zfs_fuid_create_cred(zfsvfs, gid, 1823 ZFS_GROUP, tx, cr, fuidp); 1824 } 1825 } 1826 1827 /* 1828 * If we're creating a directory, and the parent directory has the 1829 * set-GID bit set, set in on the new directory. 1830 * Otherwise, if the user is neither privileged nor a member of the 1831 * file's new group, clear the file's set-GID bit. 1832 */ 1833 1834 if ((parent->z_phys->zp_mode & S_ISGID) && (vap->va_type == VDIR)) 1835 mode |= S_ISGID; 1836 else { 1837 if ((mode & S_ISGID) && 1838 secpolicy_vnode_setids_setgids(cr, gid) != 0) 1839 mode &= ~S_ISGID; 1840 } 1841 1842 zp->z_phys->zp_uid = uid; 1843 zp->z_phys->zp_gid = gid; 1844 zp->z_phys->zp_mode = mode; 1845 1846 if (aclp == NULL) { 1847 mutex_enter(&parent->z_lock); 1848 pull_down = (parent->z_phys->zp_flags & ZFS_INHERIT_ACE); 1849 if (pull_down) { 1850 mutex_enter(&parent->z_acl_lock); 1851 VERIFY(0 == zfs_acl_node_read(parent, &paclp, B_FALSE)); 1852 mutex_exit(&parent->z_acl_lock); 1853 aclp = zfs_acl_inherit(zp, paclp); 1854 zfs_acl_free(paclp); 1855 } else { 1856 aclp = zfs_acl_alloc(zfs_acl_version_zp(zp)); 1857 } 1858 mutex_exit(&parent->z_lock); 1859 mutex_enter(&zp->z_lock); 1860 mutex_enter(&zp->z_acl_lock); 1861 error = zfs_acl_chmod(zp, mode, aclp, tx); 1862 } else { 1863 mutex_enter(&zp->z_lock); 1864 mutex_enter(&zp->z_acl_lock); 1865 } 1866 1867 /* Force auto_inherit on all new directory objects */ 1868 if (vap->va_type == VDIR) 1869 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 1870 1871 error = zfs_aclset_common(zp, aclp, fuidp, tx); 1872 1873 /* Set optional attributes if any */ 1874 if (vap->va_mask & AT_XVATTR) 1875 zfs_xvattr_set(zp, xvap); 1876 1877 mutex_exit(&zp->z_lock); 1878 mutex_exit(&zp->z_acl_lock); 1879 ASSERT3U(error, ==, 0); 1880 1881 if (aclp != setaclp) { 1882 zfs_acl_free(aclp); 1883 } 1884 } 1885 1886 /* 1887 * Retrieve a files ACL 1888 */ 1889 int 1890 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 1891 { 1892 zfs_acl_t *aclp; 1893 ulong_t mask; 1894 int error; 1895 int count = 0; 1896 int largeace = 0; 1897 1898 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT | 1899 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES); 1900 1901 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)) 1902 return (error); 1903 1904 if (mask == 0) 1905 return (ENOSYS); 1906 1907 mutex_enter(&zp->z_acl_lock); 1908 1909 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 1910 if (error != 0) { 1911 mutex_exit(&zp->z_acl_lock); 1912 return (error); 1913 } 1914 1915 /* 1916 * Scan ACL to determine number of ACEs 1917 */ 1918 if ((zp->z_phys->zp_flags & ZFS_ACL_OBJ_ACE) && 1919 !(mask & VSA_ACE_ALLTYPES)) { 1920 void *zacep = NULL; 1921 uint64_t who; 1922 uint32_t access_mask; 1923 uint16_t type, iflags; 1924 1925 while (zacep = zfs_acl_next_ace(aclp, zacep, 1926 &who, &access_mask, &iflags, &type)) { 1927 switch (type) { 1928 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE: 1929 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE: 1930 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE: 1931 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE: 1932 largeace++; 1933 continue; 1934 default: 1935 count++; 1936 } 1937 } 1938 vsecp->vsa_aclcnt = count; 1939 } else 1940 count = aclp->z_acl_count; 1941 1942 if (mask & VSA_ACECNT) { 1943 vsecp->vsa_aclcnt = count; 1944 } 1945 1946 if (mask & VSA_ACE) { 1947 size_t aclsz; 1948 1949 zfs_acl_node_t *aclnode = list_head(&aclp->z_acl); 1950 1951 aclsz = count * sizeof (ace_t) + 1952 sizeof (ace_object_t) * largeace; 1953 1954 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP); 1955 vsecp->vsa_aclentsz = aclsz; 1956 1957 if (aclp->z_version == ZFS_ACL_VERSION_FUID) 1958 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, 1959 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES)); 1960 else { 1961 bcopy(aclnode->z_acldata, vsecp->vsa_aclentp, 1962 count * sizeof (ace_t)); 1963 } 1964 } 1965 if (mask & VSA_ACE_ACLFLAGS) { 1966 vsecp->vsa_aclflags = 0; 1967 if (zp->z_phys->zp_flags & ZFS_ACL_DEFAULTED) 1968 vsecp->vsa_aclflags |= ACL_DEFAULTED; 1969 if (zp->z_phys->zp_flags & ZFS_ACL_PROTECTED) 1970 vsecp->vsa_aclflags |= ACL_PROTECTED; 1971 if (zp->z_phys->zp_flags & ZFS_ACL_AUTO_INHERIT) 1972 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT; 1973 } 1974 1975 mutex_exit(&zp->z_acl_lock); 1976 1977 zfs_acl_free(aclp); 1978 1979 return (0); 1980 } 1981 1982 int 1983 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type, 1984 vsecattr_t *vsecp, zfs_acl_t **zaclp) 1985 { 1986 zfs_acl_t *aclp; 1987 zfs_acl_node_t *aclnode; 1988 int aclcnt = vsecp->vsa_aclcnt; 1989 int error; 1990 1991 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0) 1992 return (EINVAL); 1993 1994 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version)); 1995 1996 aclp->z_hints = 0; 1997 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t)); 1998 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) { 1999 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp, 2000 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata, 2001 aclcnt, &aclnode->z_size)) != 0) { 2002 zfs_acl_free(aclp); 2003 zfs_acl_node_free(aclnode); 2004 return (error); 2005 } 2006 } else { 2007 if ((error = zfs_copy_ace_2_fuid(obj_type, aclp, 2008 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt, 2009 &aclnode->z_size)) != 0) { 2010 zfs_acl_free(aclp); 2011 zfs_acl_node_free(aclnode); 2012 return (error); 2013 } 2014 } 2015 aclp->z_acl_bytes = aclnode->z_size; 2016 aclnode->z_ace_count = aclcnt; 2017 aclp->z_acl_count = aclcnt; 2018 list_insert_head(&aclp->z_acl, aclnode); 2019 2020 /* 2021 * If flags are being set then add them to z_hints 2022 */ 2023 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) { 2024 if (vsecp->vsa_aclflags & ACL_PROTECTED) 2025 aclp->z_hints |= ZFS_ACL_PROTECTED; 2026 if (vsecp->vsa_aclflags & ACL_DEFAULTED) 2027 aclp->z_hints |= ZFS_ACL_DEFAULTED; 2028 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT) 2029 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT; 2030 } 2031 2032 *zaclp = aclp; 2033 2034 return (0); 2035 } 2036 2037 /* 2038 * Set a files ACL 2039 */ 2040 int 2041 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr) 2042 { 2043 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2044 zilog_t *zilog = zfsvfs->z_log; 2045 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT); 2046 dmu_tx_t *tx; 2047 int error; 2048 zfs_acl_t *aclp; 2049 zfs_fuid_info_t *fuidp = NULL; 2050 2051 if (mask == 0) 2052 return (ENOSYS); 2053 2054 if (zp->z_phys->zp_flags & ZFS_IMMUTABLE) 2055 return (EPERM); 2056 2057 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) 2058 return (error); 2059 2060 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, &aclp); 2061 if (error) 2062 return (error); 2063 2064 /* 2065 * If ACL wide flags aren't being set then preserve any 2066 * existing flags. 2067 */ 2068 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) { 2069 aclp->z_hints |= (zp->z_phys->zp_flags & V4_ACL_WIDE_FLAGS); 2070 } 2071 top: 2072 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)) { 2073 zfs_acl_free(aclp); 2074 return (error); 2075 } 2076 2077 mutex_enter(&zp->z_lock); 2078 mutex_enter(&zp->z_acl_lock); 2079 2080 tx = dmu_tx_create(zfsvfs->z_os); 2081 dmu_tx_hold_bonus(tx, zp->z_id); 2082 2083 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 2084 /* Are we upgrading ACL? */ 2085 if (zfsvfs->z_version <= ZPL_VERSION_FUID && 2086 zp->z_phys->zp_acl.z_acl_version == 2087 ZFS_ACL_VERSION_INITIAL) { 2088 dmu_tx_hold_free(tx, 2089 zp->z_phys->zp_acl.z_acl_extern_obj, 2090 0, DMU_OBJECT_END); 2091 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2092 0, sizeof (zfs_object_ace_t) * 2048 + 6); 2093 } else { 2094 dmu_tx_hold_write(tx, 2095 zp->z_phys->zp_acl.z_acl_extern_obj, 2096 0, aclp->z_acl_bytes); 2097 } 2098 } else if (aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2099 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes); 2100 } 2101 if (zfsvfs->z_fuid_obj == 0) { 2102 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 2103 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2104 SPA_MAXBLOCKSIZE); 2105 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL); 2106 } else { 2107 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj); 2108 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0, 2109 SPA_MAXBLOCKSIZE); 2110 } 2111 2112 error = dmu_tx_assign(tx, zfsvfs->z_assign); 2113 if (error) { 2114 mutex_exit(&zp->z_acl_lock); 2115 mutex_exit(&zp->z_lock); 2116 2117 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2118 dmu_tx_wait(tx); 2119 dmu_tx_abort(tx); 2120 goto top; 2121 } 2122 dmu_tx_abort(tx); 2123 zfs_acl_free(aclp); 2124 return (error); 2125 } 2126 2127 error = zfs_aclset_common(zp, aclp, &fuidp, tx); 2128 ASSERT(error == 0); 2129 2130 zfs_log_acl(zilog, tx, zp, vsecp, fuidp); 2131 2132 if (fuidp) 2133 zfs_fuid_info_free(fuidp); 2134 zfs_acl_free(aclp); 2135 dmu_tx_commit(tx); 2136 done: 2137 mutex_exit(&zp->z_acl_lock); 2138 mutex_exit(&zp->z_lock); 2139 2140 return (error); 2141 } 2142 2143 /* 2144 * working_mode returns the permissions that were not granted 2145 */ 2146 static int 2147 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode, 2148 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr) 2149 { 2150 zfs_acl_t *aclp; 2151 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2152 int error; 2153 int access_deny = ACCESS_UNDETERMINED; 2154 uid_t uid = crgetuid(cr); 2155 uint64_t who; 2156 uint16_t type, iflags; 2157 uint16_t entry_type; 2158 uint32_t access_mask; 2159 zfs_ace_hdr_t *acep = NULL; 2160 boolean_t checkit; 2161 uid_t fowner; 2162 uid_t gowner; 2163 2164 /* 2165 * Short circuit empty requests 2166 */ 2167 if (v4_mode == 0) 2168 return (0); 2169 2170 *check_privs = B_TRUE; 2171 2172 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ 2173 *working_mode = 0; 2174 return (0); 2175 } 2176 2177 *working_mode = v4_mode; 2178 2179 if ((v4_mode & WRITE_MASK) && 2180 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) && 2181 (!IS_DEVVP(ZTOV(zp)))) { 2182 *check_privs = B_FALSE; 2183 return (EROFS); 2184 } 2185 2186 /* 2187 * Only check for READONLY on non-directories. 2188 */ 2189 if ((v4_mode & WRITE_MASK_DATA) && 2190 (((ZTOV(zp)->v_type != VDIR) && 2191 (zp->z_phys->zp_flags & (ZFS_READONLY | ZFS_IMMUTABLE))) || 2192 (ZTOV(zp)->v_type == VDIR && 2193 (zp->z_phys->zp_flags & ZFS_IMMUTABLE)))) { 2194 *check_privs = B_FALSE; 2195 return (EPERM); 2196 } 2197 2198 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) && 2199 (zp->z_phys->zp_flags & ZFS_NOUNLINK)) { 2200 *check_privs = B_FALSE; 2201 return (EPERM); 2202 } 2203 2204 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) && 2205 (zp->z_phys->zp_flags & ZFS_AV_QUARANTINED))) { 2206 *check_privs = B_FALSE; 2207 return (EACCES); 2208 } 2209 2210 /* 2211 * The caller requested that the ACL check be skipped. This 2212 * would only happen if the caller checked VOP_ACCESS() with a 2213 * 32 bit ACE mask and already had the appropriate permissions. 2214 */ 2215 if (skipaclchk) { 2216 *working_mode = 0; 2217 return (0); 2218 } 2219 2220 zfs_fuid_map_ids(zp, &fowner, &gowner); 2221 2222 mutex_enter(&zp->z_acl_lock); 2223 2224 error = zfs_acl_node_read(zp, &aclp, B_FALSE); 2225 if (error != 0) { 2226 mutex_exit(&zp->z_acl_lock); 2227 return (error); 2228 } 2229 2230 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask, 2231 &iflags, &type)) { 2232 2233 if (iflags & ACE_INHERIT_ONLY_ACE) 2234 continue; 2235 2236 entry_type = (iflags & ACE_TYPE_FLAGS); 2237 2238 checkit = B_FALSE; 2239 2240 switch (entry_type) { 2241 case ACE_OWNER: 2242 if (uid == fowner) 2243 checkit = B_TRUE; 2244 break; 2245 case OWNING_GROUP: 2246 who = gowner; 2247 /*FALLTHROUGH*/ 2248 case ACE_IDENTIFIER_GROUP: 2249 checkit = zfs_groupmember(zfsvfs, who, cr); 2250 break; 2251 case ACE_EVERYONE: 2252 checkit = B_TRUE; 2253 break; 2254 2255 /* USER Entry */ 2256 default: 2257 if (entry_type == 0) { 2258 uid_t newid; 2259 2260 zfs_fuid_map_id(zfsvfs, who, 2261 ZFS_ACE_USER, &newid); 2262 if (newid != IDMAP_WK_CREATOR_OWNER_UID && 2263 uid == newid) 2264 checkit = B_TRUE; 2265 break; 2266 } else { 2267 zfs_acl_free(aclp); 2268 mutex_exit(&zp->z_acl_lock); 2269 return (EIO); 2270 } 2271 } 2272 2273 if (checkit) { 2274 if (access_mask & *working_mode) { 2275 if (type == ALLOW) { 2276 *working_mode &= 2277 ~(*working_mode & access_mask); 2278 if (*working_mode == 0) { 2279 access_deny = 0; 2280 } 2281 } else if (type == DENY) { 2282 access_deny = EACCES; 2283 } 2284 } 2285 } 2286 2287 if (access_deny != ACCESS_UNDETERMINED) 2288 break; 2289 } 2290 2291 mutex_exit(&zp->z_acl_lock); 2292 zfs_acl_free(aclp); 2293 out: 2294 return (access_deny); 2295 } 2296 2297 static int 2298 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs, 2299 cred_t *cr) 2300 { 2301 if (*working_mode != ACE_WRITE_DATA) 2302 return (EACCES); 2303 2304 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode, 2305 check_privs, B_FALSE, cr)); 2306 } 2307 2308 /* 2309 * Determine whether Access should be granted/denied, invoking least 2310 * priv subsytem when a deny is determined. 2311 */ 2312 int 2313 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) 2314 { 2315 uint32_t working_mode; 2316 int error; 2317 int is_attr; 2318 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2319 boolean_t check_privs; 2320 znode_t *xzp; 2321 znode_t *check_zp = zp; 2322 2323 is_attr = ((zp->z_phys->zp_flags & ZFS_XATTR) && 2324 (ZTOV(zp)->v_type == VDIR)); 2325 2326 /* 2327 * If attribute then validate against base file 2328 */ 2329 if (is_attr) { 2330 if ((error = zfs_zget(zp->z_zfsvfs, 2331 zp->z_phys->zp_parent, &xzp)) != 0) { 2332 return (error); 2333 } 2334 2335 check_zp = xzp; 2336 2337 /* 2338 * fixup mode to map to xattr perms 2339 */ 2340 2341 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) { 2342 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA); 2343 mode |= ACE_WRITE_NAMED_ATTRS; 2344 } 2345 2346 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) { 2347 mode &= ~(ACE_READ_DATA|ACE_EXECUTE); 2348 mode |= ACE_READ_NAMED_ATTRS; 2349 } 2350 } 2351 2352 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, 2353 &check_privs, skipaclchk, cr)) == 0) { 2354 if (is_attr) 2355 VN_RELE(ZTOV(xzp)); 2356 return (0); 2357 } 2358 2359 if (error && check_privs == B_FALSE) { 2360 if (is_attr) 2361 VN_RELE(ZTOV(xzp)); 2362 return (error); 2363 } 2364 2365 if (error && (flags & V_APPEND)) { 2366 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr); 2367 } 2368 2369 if (error && check_privs) { 2370 uid_t owner; 2371 mode_t checkmode = 0; 2372 2373 zfs_fuid_map_id(zfsvfs, check_zp->z_phys->zp_uid, 2374 ZFS_OWNER, &owner); 2375 2376 /* 2377 * First check for implicit owner permission on 2378 * read_acl/read_attributes 2379 */ 2380 2381 error = 0; 2382 ASSERT(working_mode != 0); 2383 2384 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) && 2385 owner == crgetuid(cr))) 2386 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES); 2387 2388 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS| 2389 ACE_READ_ACL|ACE_READ_ATTRIBUTES)) 2390 checkmode |= VREAD; 2391 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS| 2392 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES)) 2393 checkmode |= VWRITE; 2394 if (working_mode & ACE_EXECUTE) 2395 checkmode |= VEXEC; 2396 2397 if (checkmode) 2398 error = secpolicy_vnode_access(cr, ZTOV(check_zp), 2399 owner, checkmode); 2400 2401 if (error == 0 && (working_mode & ACE_WRITE_OWNER)) 2402 error = secpolicy_vnode_create_gid(cr); 2403 if (error == 0 && (working_mode & ACE_WRITE_ACL)) 2404 error = secpolicy_vnode_setdac(cr, owner); 2405 2406 if (error == 0 && (working_mode & 2407 (ACE_DELETE|ACE_DELETE_CHILD))) 2408 error = secpolicy_vnode_remove(cr); 2409 2410 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) 2411 error = secpolicy_vnode_owner(cr, owner); 2412 2413 if (error == 0) { 2414 /* 2415 * See if any bits other than those already checked 2416 * for are still present. If so then return EACCES 2417 */ 2418 if (working_mode & ~(ZFS_CHECKED_MASKS)) { 2419 error = EACCES; 2420 } 2421 } 2422 } 2423 2424 if (is_attr) 2425 VN_RELE(ZTOV(xzp)); 2426 2427 return (error); 2428 } 2429 2430 /* 2431 * Translate traditional unix VREAD/VWRITE/VEXEC mode into 2432 * native ACL format and call zfs_zaccess() 2433 */ 2434 int 2435 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr) 2436 { 2437 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr)); 2438 } 2439 2440 /* 2441 * Access function for secpolicy_vnode_setattr 2442 */ 2443 int 2444 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr) 2445 { 2446 int v4_mode = zfs_unix_to_v4(mode >> 6); 2447 2448 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr)); 2449 } 2450 2451 static int 2452 zfs_delete_final_check(znode_t *zp, znode_t *dzp, cred_t *cr) 2453 { 2454 int error; 2455 uid_t downer; 2456 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2457 2458 zfs_fuid_map_id(zfsvfs, dzp->z_phys->zp_uid, ZFS_OWNER, &downer); 2459 2460 error = secpolicy_vnode_access(cr, ZTOV(zp), downer, S_IWRITE|S_IEXEC); 2461 2462 if (error == 0) 2463 error = zfs_sticky_remove_access(dzp, zp, cr); 2464 2465 return (error); 2466 } 2467 2468 /* 2469 * Determine whether Access should be granted/deny, without 2470 * consulting least priv subsystem. 2471 * 2472 * 2473 * The following chart is the recommended NFSv4 enforcement for 2474 * ability to delete an object. 2475 * 2476 * ------------------------------------------------------- 2477 * | Parent Dir | Target Object Permissions | 2478 * | permissions | | 2479 * ------------------------------------------------------- 2480 * | | ACL Allows | ACL Denies| Delete | 2481 * | | Delete | Delete | unspecified| 2482 * ------------------------------------------------------- 2483 * | ACL Allows | Permit | Permit | Permit | 2484 * | DELETE_CHILD | | 2485 * ------------------------------------------------------- 2486 * | ACL Denies | Permit | Deny | Deny | 2487 * | DELETE_CHILD | | | | 2488 * ------------------------------------------------------- 2489 * | ACL specifies | | | | 2490 * | only allow | Permit | Permit | Permit | 2491 * | write and | | | | 2492 * | execute | | | | 2493 * ------------------------------------------------------- 2494 * | ACL denies | | | | 2495 * | write and | Permit | Deny | Deny | 2496 * | execute | | | | 2497 * ------------------------------------------------------- 2498 * ^ 2499 * | 2500 * No search privilege, can't even look up file? 2501 * 2502 */ 2503 int 2504 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr) 2505 { 2506 uint32_t dzp_working_mode = 0; 2507 uint32_t zp_working_mode = 0; 2508 int dzp_error, zp_error; 2509 boolean_t dzpcheck_privs = B_TRUE; 2510 boolean_t zpcheck_privs = B_TRUE; 2511 2512 /* 2513 * Arghh, this check is going to require a couple of questions 2514 * to be asked. We want specific DELETE permissions to 2515 * take precedence over WRITE/EXECUTE. We don't 2516 * want an ACL such as this to mess us up. 2517 * user:joe:write_data:deny,user:joe:delete:allow 2518 * 2519 * However, deny permissions may ultimately be overridden 2520 * by secpolicy_vnode_access(). 2521 */ 2522 2523 if (zp->z_phys->zp_flags & (ZFS_IMMUTABLE | ZFS_NOUNLINK)) 2524 return (EPERM); 2525 2526 dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD, 2527 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr); 2528 zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode, 2529 &zpcheck_privs, B_FALSE, cr); 2530 2531 if ((dzp_error && dzpcheck_privs == B_FALSE) || 2532 (zp_error && zpcheck_privs == B_FALSE)) 2533 return (dzp_error); 2534 2535 /* 2536 * First check the first row. 2537 * We only need to see if parent Allows delete_child 2538 */ 2539 if ((dzp_working_mode & ACE_DELETE_CHILD) == 0) 2540 return (0); 2541 2542 /* 2543 * Second row 2544 * we already have the necessary information in 2545 * zp_working_mode, zp_error and dzp_error. 2546 */ 2547 2548 if ((zp_working_mode & ACE_DELETE) == 0) 2549 return (0); 2550 2551 /* 2552 * Now zp_error should either be EACCES which indicates 2553 * a "deny" delete entry or ACCESS_UNDETERMINED if the "delete" 2554 * entry exists on the target. 2555 * 2556 * dzp_error should be either EACCES which indicates a "deny" 2557 * entry for delete_child or ACCESS_UNDETERMINED if no delete_child 2558 * entry exists. If value is EACCES then we are done 2559 * and zfs_delete_final_check() will make the final decision 2560 * regarding to allow the delete. 2561 */ 2562 2563 ASSERT(zp_error != 0 && dzp_error != 0); 2564 if (dzp_error == EACCES) 2565 return (zfs_delete_final_check(zp, dzp, cr)); 2566 2567 /* 2568 * Third Row 2569 * Only need to check for write/execute on parent 2570 */ 2571 2572 dzp_error = zfs_zaccess_common(dzp, ACE_WRITE_DATA|ACE_EXECUTE, 2573 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr); 2574 2575 if (dzp_error && dzpcheck_privs == B_FALSE) 2576 return (dzp_error); 2577 2578 if ((dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE)) == 0) 2579 return (zfs_sticky_remove_access(dzp, zp, cr)); 2580 2581 /* 2582 * Fourth Row 2583 */ 2584 2585 if (((dzp_working_mode & (ACE_WRITE_DATA|ACE_EXECUTE)) != 0) && 2586 ((zp_working_mode & ACE_DELETE) == 0)) 2587 return (zfs_sticky_remove_access(dzp, zp, cr)); 2588 2589 return (zfs_delete_final_check(zp, dzp, cr)); 2590 } 2591 2592 int 2593 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp, 2594 znode_t *tzp, cred_t *cr) 2595 { 2596 int add_perm; 2597 int error; 2598 2599 if (szp->z_phys->zp_flags & ZFS_AV_QUARANTINED) 2600 return (EACCES); 2601 2602 add_perm = (ZTOV(szp)->v_type == VDIR) ? 2603 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE; 2604 2605 /* 2606 * Rename permissions are combination of delete permission + 2607 * add file/subdir permission. 2608 */ 2609 2610 /* 2611 * first make sure we do the delete portion. 2612 * 2613 * If that succeeds then check for add_file/add_subdir permissions 2614 */ 2615 2616 if (error = zfs_zaccess_delete(sdzp, szp, cr)) 2617 return (error); 2618 2619 /* 2620 * If we have a tzp, see if we can delete it? 2621 */ 2622 if (tzp) { 2623 if (error = zfs_zaccess_delete(tdzp, tzp, cr)) 2624 return (error); 2625 } 2626 2627 /* 2628 * Now check for add permissions 2629 */ 2630 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr); 2631 2632 return (error); 2633 } 2634