1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <sys/avl.h> 31 #if defined(_KERNEL) 32 #include <sys/systm.h> 33 #include <sys/sysmacros.h> 34 #include <acl/acl_common.h> 35 #else 36 #include <errno.h> 37 #include <stdlib.h> 38 #include <stddef.h> 39 #include <strings.h> 40 #include <unistd.h> 41 #include <assert.h> 42 #include <grp.h> 43 #include <pwd.h> 44 #include <acl_common.h> 45 #define ASSERT assert 46 #endif 47 48 #define ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA | \ 49 ACE_WRITE_DATA | ACE_APPEND_DATA | ACE_EXECUTE | \ 50 ACE_READ_ATTRIBUTES | ACE_READ_ACL | ACE_WRITE_ACL) 51 52 53 #define ACL_SYNCHRONIZE_SET_DENY 0x0000001 54 #define ACL_SYNCHRONIZE_SET_ALLOW 0x0000002 55 #define ACL_SYNCHRONIZE_ERR_DENY 0x0000004 56 #define ACL_SYNCHRONIZE_ERR_ALLOW 0x0000008 57 58 #define ACL_WRITE_OWNER_SET_DENY 0x0000010 59 #define ACL_WRITE_OWNER_SET_ALLOW 0x0000020 60 #define ACL_WRITE_OWNER_ERR_DENY 0x0000040 61 #define ACL_WRITE_OWNER_ERR_ALLOW 0x0000080 62 63 #define ACL_DELETE_SET_DENY 0x0000100 64 #define ACL_DELETE_SET_ALLOW 0x0000200 65 #define ACL_DELETE_ERR_DENY 0x0000400 66 #define ACL_DELETE_ERR_ALLOW 0x0000800 67 68 #define ACL_WRITE_ATTRS_OWNER_SET_DENY 0x0001000 69 #define ACL_WRITE_ATTRS_OWNER_SET_ALLOW 0x0002000 70 #define ACL_WRITE_ATTRS_OWNER_ERR_DENY 0x0004000 71 #define ACL_WRITE_ATTRS_OWNER_ERR_ALLOW 0x0008000 72 73 #define ACL_WRITE_ATTRS_WRITER_SET_DENY 0x0010000 74 #define ACL_WRITE_ATTRS_WRITER_SET_ALLOW 0x0020000 75 #define ACL_WRITE_ATTRS_WRITER_ERR_DENY 0x0040000 76 #define ACL_WRITE_ATTRS_WRITER_ERR_ALLOW 0x0080000 77 78 #define ACL_WRITE_NAMED_WRITER_SET_DENY 0x0100000 79 #define ACL_WRITE_NAMED_WRITER_SET_ALLOW 0x0200000 80 #define ACL_WRITE_NAMED_WRITER_ERR_DENY 0x0400000 81 #define ACL_WRITE_NAMED_WRITER_ERR_ALLOW 0x0800000 82 83 #define ACL_READ_NAMED_READER_SET_DENY 0x1000000 84 #define ACL_READ_NAMED_READER_SET_ALLOW 0x2000000 85 #define ACL_READ_NAMED_READER_ERR_DENY 0x4000000 86 #define ACL_READ_NAMED_READER_ERR_ALLOW 0x8000000 87 88 89 #define ACE_VALID_MASK_BITS (\ 90 ACE_READ_DATA | \ 91 ACE_LIST_DIRECTORY | \ 92 ACE_WRITE_DATA | \ 93 ACE_ADD_FILE | \ 94 ACE_APPEND_DATA | \ 95 ACE_ADD_SUBDIRECTORY | \ 96 ACE_READ_NAMED_ATTRS | \ 97 ACE_WRITE_NAMED_ATTRS | \ 98 ACE_EXECUTE | \ 99 ACE_DELETE_CHILD | \ 100 ACE_READ_ATTRIBUTES | \ 101 ACE_WRITE_ATTRIBUTES | \ 102 ACE_DELETE | \ 103 ACE_READ_ACL | \ 104 ACE_WRITE_ACL | \ 105 ACE_WRITE_OWNER | \ 106 ACE_SYNCHRONIZE) 107 108 #define ACE_MASK_UNDEFINED 0x80000000 109 110 #define ACE_VALID_FLAG_BITS (ACE_FILE_INHERIT_ACE | \ 111 ACE_DIRECTORY_INHERIT_ACE | \ 112 ACE_NO_PROPAGATE_INHERIT_ACE | ACE_INHERIT_ONLY_ACE | \ 113 ACE_SUCCESSFUL_ACCESS_ACE_FLAG | ACE_FAILED_ACCESS_ACE_FLAG | \ 114 ACE_IDENTIFIER_GROUP | ACE_OWNER | ACE_GROUP | ACE_EVERYONE) 115 116 /* 117 * ACL conversion helpers 118 */ 119 120 typedef enum { 121 ace_unused, 122 ace_user_obj, 123 ace_user, 124 ace_group, /* includes GROUP and GROUP_OBJ */ 125 ace_other_obj 126 } ace_to_aent_state_t; 127 128 typedef struct acevals { 129 uid_t key; 130 avl_node_t avl; 131 uint32_t mask; 132 uint32_t allowed; 133 uint32_t denied; 134 int aent_type; 135 } acevals_t; 136 137 typedef struct ace_list { 138 acevals_t user_obj; 139 avl_tree_t user; 140 int numusers; 141 acevals_t group_obj; 142 avl_tree_t group; 143 int numgroups; 144 acevals_t other_obj; 145 uint32_t acl_mask; 146 int hasmask; 147 int dfacl_flag; 148 ace_to_aent_state_t state; 149 int seen; /* bitmask of all aclent_t a_type values seen */ 150 } ace_list_t; 151 152 ace_t trivial_acl[] = { 153 {(uid_t)-1, 0, ACE_OWNER, ACE_ACCESS_DENIED_ACE_TYPE}, 154 {(uid_t)-1, ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| 155 ACE_WRITE_NAMED_ATTRS, ACE_OWNER, ACE_ACCESS_ALLOWED_ACE_TYPE}, 156 {(uid_t)-1, 0, ACE_GROUP|ACE_IDENTIFIER_GROUP, 157 ACE_ACCESS_DENIED_ACE_TYPE}, 158 {(uid_t)-1, 0, ACE_GROUP|ACE_IDENTIFIER_GROUP, 159 ACE_ACCESS_ALLOWED_ACE_TYPE}, 160 {(uid_t)-1, ACE_WRITE_ACL|ACE_WRITE_OWNER| ACE_WRITE_ATTRIBUTES| 161 ACE_WRITE_NAMED_ATTRS, ACE_EVERYONE, ACE_ACCESS_DENIED_ACE_TYPE}, 162 {(uid_t)-1, ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS| 163 ACE_SYNCHRONIZE, ACE_EVERYONE, ACE_ACCESS_ALLOWED_ACE_TYPE} 164 }; 165 166 167 void 168 adjust_ace_pair_common(void *pair, size_t access_off, 169 size_t pairsize, mode_t mode) 170 { 171 char *datap = (char *)pair; 172 uint32_t *amask0 = (uint32_t *)(uintptr_t)(datap + access_off); 173 uint32_t *amask1 = (uint32_t *)(uintptr_t)(datap + pairsize + 174 access_off); 175 if (mode & S_IROTH) 176 *amask1 |= ACE_READ_DATA; 177 else 178 *amask0 |= ACE_READ_DATA; 179 if (mode & S_IWOTH) 180 *amask1 |= ACE_WRITE_DATA|ACE_APPEND_DATA; 181 else 182 *amask0 |= ACE_WRITE_DATA|ACE_APPEND_DATA; 183 if (mode & S_IXOTH) 184 *amask1 |= ACE_EXECUTE; 185 else 186 *amask0 |= ACE_EXECUTE; 187 } 188 189 void 190 adjust_ace_pair(ace_t *pair, mode_t mode) 191 { 192 adjust_ace_pair_common(pair, offsetof(ace_t, a_access_mask), 193 sizeof (ace_t), mode); 194 } 195 196 static void 197 ace_allow_deny_helper(uint16_t type, boolean_t *allow, boolean_t *deny) 198 { 199 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE) 200 *allow = B_TRUE; 201 else if (type == ACE_ACCESS_DENIED_ACE_TYPE) 202 *deny = B_TRUE; 203 } 204 205 /* 206 * ace_trivial: 207 * determine whether an ace_t acl is trivial 208 * 209 * Trivialness implies that the acl is composed of only 210 * owner, group, everyone entries. ACL can't 211 * have read_acl denied, and write_owner/write_acl/write_attributes 212 * can only be owner@ entry. 213 */ 214 int 215 ace_trivial_common(void *acep, int aclcnt, 216 uint64_t (*walk)(void *, uint64_t, int aclcnt, 217 uint16_t *, uint16_t *, uint32_t *)) 218 { 219 boolean_t owner_allow = B_FALSE; 220 boolean_t group_allow = B_FALSE; 221 boolean_t everyone_allow = B_FALSE; 222 boolean_t owner_deny = B_FALSE; 223 boolean_t group_deny = B_FALSE; 224 boolean_t everyone_deny = B_FALSE; 225 uint16_t flags; 226 uint32_t mask; 227 uint16_t type; 228 uint64_t cookie = 0; 229 230 while (cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask)) { 231 switch (flags & ACE_TYPE_FLAGS) { 232 case ACE_OWNER: 233 if (group_allow || group_deny || everyone_allow || 234 everyone_deny) 235 return (1); 236 ace_allow_deny_helper(type, &owner_allow, &owner_deny); 237 break; 238 case ACE_GROUP|ACE_IDENTIFIER_GROUP: 239 if (everyone_allow || everyone_deny && 240 (!owner_allow && !owner_deny)) 241 return (1); 242 ace_allow_deny_helper(type, &group_allow, &group_deny); 243 break; 244 245 case ACE_EVERYONE: 246 if (!owner_allow && !owner_deny && 247 !group_allow && !group_deny) 248 return (1); 249 ace_allow_deny_helper(type, 250 &everyone_allow, &everyone_deny); 251 break; 252 default: 253 return (1); 254 255 } 256 257 if (flags & (ACE_FILE_INHERIT_ACE| 258 ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE| 259 ACE_INHERIT_ONLY_ACE)) 260 return (1); 261 262 /* 263 * Special check for some special bits 264 * 265 * Don't allow anybody to deny reading basic 266 * attributes or a files ACL. 267 */ 268 if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) && 269 (type == ACE_ACCESS_DENIED_ACE_TYPE)) 270 return (1); 271 272 /* 273 * Allow on owner@ to allow 274 * write_acl/write_owner/write_attributes 275 */ 276 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE && 277 (!(flags & ACE_OWNER) && (mask & 278 (ACE_WRITE_OWNER|ACE_WRITE_ACL|ACE_WRITE_ATTRIBUTES)))) 279 return (1); 280 281 } 282 283 if (!owner_allow || !owner_deny || !group_allow || !group_deny || 284 !everyone_allow || !everyone_deny) 285 return (1); 286 287 return (0); 288 } 289 290 uint64_t 291 ace_walk(void *datap, uint64_t cookie, int aclcnt, uint16_t *flags, 292 uint16_t *type, uint32_t *mask) 293 { 294 ace_t *acep = datap; 295 296 if (cookie >= aclcnt) 297 return (0); 298 299 *flags = acep[cookie].a_flags; 300 *type = acep[cookie].a_type; 301 *mask = acep[cookie++].a_access_mask; 302 303 return (cookie); 304 } 305 306 int 307 ace_trivial(ace_t *acep, int aclcnt) 308 { 309 return (ace_trivial_common(acep, aclcnt, ace_walk)); 310 } 311 312 /* 313 * Generic shellsort, from K&R (1st ed, p 58.), somewhat modified. 314 * v = Ptr to array/vector of objs 315 * n = # objs in the array 316 * s = size of each obj (must be multiples of a word size) 317 * f = ptr to function to compare two objs 318 * returns (-1 = less than, 0 = equal, 1 = greater than 319 */ 320 void 321 ksort(caddr_t v, int n, int s, int (*f)()) 322 { 323 int g, i, j, ii; 324 unsigned int *p1, *p2; 325 unsigned int tmp; 326 327 /* No work to do */ 328 if (v == NULL || n <= 1) 329 return; 330 331 /* Sanity check on arguments */ 332 ASSERT(((uintptr_t)v & 0x3) == 0 && (s & 0x3) == 0); 333 ASSERT(s > 0); 334 for (g = n / 2; g > 0; g /= 2) { 335 for (i = g; i < n; i++) { 336 for (j = i - g; j >= 0 && 337 (*f)(v + j * s, v + (j + g) * s) == 1; 338 j -= g) { 339 p1 = (void *)(v + j * s); 340 p2 = (void *)(v + (j + g) * s); 341 for (ii = 0; ii < s / 4; ii++) { 342 tmp = *p1; 343 *p1++ = *p2; 344 *p2++ = tmp; 345 } 346 } 347 } 348 } 349 } 350 351 /* 352 * Compare two acls, all fields. Returns: 353 * -1 (less than) 354 * 0 (equal) 355 * +1 (greater than) 356 */ 357 int 358 cmp2acls(void *a, void *b) 359 { 360 aclent_t *x = (aclent_t *)a; 361 aclent_t *y = (aclent_t *)b; 362 363 /* Compare types */ 364 if (x->a_type < y->a_type) 365 return (-1); 366 if (x->a_type > y->a_type) 367 return (1); 368 /* Equal types; compare id's */ 369 if (x->a_id < y->a_id) 370 return (-1); 371 if (x->a_id > y->a_id) 372 return (1); 373 /* Equal ids; compare perms */ 374 if (x->a_perm < y->a_perm) 375 return (-1); 376 if (x->a_perm > y->a_perm) 377 return (1); 378 /* Totally equal */ 379 return (0); 380 } 381 382 /*ARGSUSED*/ 383 static void * 384 cacl_realloc(void *ptr, size_t size, size_t new_size) 385 { 386 #if defined(_KERNEL) 387 void *tmp; 388 389 tmp = kmem_alloc(new_size, KM_SLEEP); 390 (void) memcpy(tmp, ptr, (size < new_size) ? size : new_size); 391 kmem_free(ptr, size); 392 return (tmp); 393 #else 394 return (realloc(ptr, new_size)); 395 #endif 396 } 397 398 static int 399 cacl_malloc(void **ptr, size_t size) 400 { 401 #if defined(_KERNEL) 402 *ptr = kmem_zalloc(size, KM_SLEEP); 403 return (0); 404 #else 405 *ptr = calloc(1, size); 406 if (*ptr == NULL) 407 return (errno); 408 409 return (0); 410 #endif 411 } 412 413 /*ARGSUSED*/ 414 static void 415 cacl_free(void *ptr, size_t size) 416 { 417 #if defined(_KERNEL) 418 kmem_free(ptr, size); 419 #else 420 free(ptr); 421 #endif 422 } 423 424 acl_t * 425 acl_alloc(enum acl_type type) 426 { 427 acl_t *aclp; 428 429 if (cacl_malloc((void **)&aclp, sizeof (acl_t)) != 0) 430 return (NULL); 431 432 aclp->acl_aclp = NULL; 433 aclp->acl_cnt = 0; 434 435 switch (type) { 436 case ACE_T: 437 aclp->acl_type = ACE_T; 438 aclp->acl_entry_size = sizeof (ace_t); 439 break; 440 case ACLENT_T: 441 aclp->acl_type = ACLENT_T; 442 aclp->acl_entry_size = sizeof (aclent_t); 443 break; 444 default: 445 acl_free(aclp); 446 aclp = NULL; 447 } 448 return (aclp); 449 } 450 451 /* 452 * Free acl_t structure 453 */ 454 void 455 acl_free(acl_t *aclp) 456 { 457 int acl_size; 458 459 if (aclp == NULL) 460 return; 461 462 if (aclp->acl_aclp) { 463 acl_size = aclp->acl_cnt * aclp->acl_entry_size; 464 cacl_free(aclp->acl_aclp, acl_size); 465 } 466 467 cacl_free(aclp, sizeof (acl_t)); 468 } 469 470 static uint32_t 471 access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow) 472 { 473 uint32_t access_mask = 0; 474 int acl_produce; 475 int synchronize_set = 0, write_owner_set = 0; 476 int delete_set = 0, write_attrs_set = 0; 477 int read_named_set = 0, write_named_set = 0; 478 479 acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW | 480 ACL_WRITE_ATTRS_OWNER_SET_ALLOW | 481 ACL_WRITE_ATTRS_WRITER_SET_DENY); 482 483 if (isallow) { 484 synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW; 485 write_owner_set = ACL_WRITE_OWNER_SET_ALLOW; 486 delete_set = ACL_DELETE_SET_ALLOW; 487 if (hasreadperm) 488 read_named_set = ACL_READ_NAMED_READER_SET_ALLOW; 489 if (haswriteperm) 490 write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW; 491 if (isowner) 492 write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW; 493 else if (haswriteperm) 494 write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW; 495 } else { 496 497 synchronize_set = ACL_SYNCHRONIZE_SET_DENY; 498 write_owner_set = ACL_WRITE_OWNER_SET_DENY; 499 delete_set = ACL_DELETE_SET_DENY; 500 if (hasreadperm) 501 read_named_set = ACL_READ_NAMED_READER_SET_DENY; 502 if (haswriteperm) 503 write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY; 504 if (isowner) 505 write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY; 506 else if (haswriteperm) 507 write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY; 508 else 509 /* 510 * If the entity is not the owner and does not 511 * have write permissions ACE_WRITE_ATTRIBUTES will 512 * always go in the DENY ACE. 513 */ 514 access_mask |= ACE_WRITE_ATTRIBUTES; 515 } 516 517 if (acl_produce & synchronize_set) 518 access_mask |= ACE_SYNCHRONIZE; 519 if (acl_produce & write_owner_set) 520 access_mask |= ACE_WRITE_OWNER; 521 if (acl_produce & delete_set) 522 access_mask |= ACE_DELETE; 523 if (acl_produce & write_attrs_set) 524 access_mask |= ACE_WRITE_ATTRIBUTES; 525 if (acl_produce & read_named_set) 526 access_mask |= ACE_READ_NAMED_ATTRS; 527 if (acl_produce & write_named_set) 528 access_mask |= ACE_WRITE_NAMED_ATTRS; 529 530 return (access_mask); 531 } 532 533 /* 534 * Given an mode_t, convert it into an access_mask as used 535 * by nfsace, assuming aclent_t -> nfsace semantics. 536 */ 537 static uint32_t 538 mode_to_ace_access(mode_t mode, int isdir, int isowner, int isallow) 539 { 540 uint32_t access = 0; 541 int haswriteperm = 0; 542 int hasreadperm = 0; 543 544 if (isallow) { 545 haswriteperm = (mode & S_IWOTH); 546 hasreadperm = (mode & S_IROTH); 547 } else { 548 haswriteperm = !(mode & S_IWOTH); 549 hasreadperm = !(mode & S_IROTH); 550 } 551 552 /* 553 * The following call takes care of correctly setting the following 554 * mask bits in the access_mask: 555 * ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE, 556 * ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS 557 */ 558 access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow); 559 560 if (isallow) { 561 access |= ACE_READ_ACL | ACE_READ_ATTRIBUTES; 562 if (isowner) 563 access |= ACE_WRITE_ACL; 564 } else { 565 if (! isowner) 566 access |= ACE_WRITE_ACL; 567 } 568 569 /* read */ 570 if (mode & S_IROTH) { 571 access |= ACE_READ_DATA; 572 } 573 /* write */ 574 if (mode & S_IWOTH) { 575 access |= ACE_WRITE_DATA | 576 ACE_APPEND_DATA; 577 if (isdir) 578 access |= ACE_DELETE_CHILD; 579 } 580 /* exec */ 581 if (mode & 01) { 582 access |= ACE_EXECUTE; 583 } 584 585 return (access); 586 } 587 588 /* 589 * Given an nfsace (presumably an ALLOW entry), make a 590 * corresponding DENY entry at the address given. 591 */ 592 static void 593 ace_make_deny(ace_t *allow, ace_t *deny, int isdir, int isowner) 594 { 595 (void) memcpy(deny, allow, sizeof (ace_t)); 596 597 deny->a_who = allow->a_who; 598 599 deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE; 600 deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS; 601 if (isdir) 602 deny->a_access_mask ^= ACE_DELETE_CHILD; 603 604 deny->a_access_mask &= ~(ACE_SYNCHRONIZE | ACE_WRITE_OWNER | 605 ACE_DELETE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS | 606 ACE_WRITE_NAMED_ATTRS); 607 deny->a_access_mask |= access_mask_set((allow->a_access_mask & 608 ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner, 609 B_FALSE); 610 } 611 /* 612 * Make an initial pass over an array of aclent_t's. Gather 613 * information such as an ACL_MASK (if any), number of users, 614 * number of groups, and whether the array needs to be sorted. 615 */ 616 static int 617 ln_aent_preprocess(aclent_t *aclent, int n, 618 int *hasmask, mode_t *mask, 619 int *numuser, int *numgroup, int *needsort) 620 { 621 int error = 0; 622 int i; 623 int curtype = 0; 624 625 *hasmask = 0; 626 *mask = 07; 627 *needsort = 0; 628 *numuser = 0; 629 *numgroup = 0; 630 631 for (i = 0; i < n; i++) { 632 if (aclent[i].a_type < curtype) 633 *needsort = 1; 634 else if (aclent[i].a_type > curtype) 635 curtype = aclent[i].a_type; 636 if (aclent[i].a_type & USER) 637 (*numuser)++; 638 if (aclent[i].a_type & (GROUP | GROUP_OBJ)) 639 (*numgroup)++; 640 if (aclent[i].a_type & CLASS_OBJ) { 641 if (*hasmask) { 642 error = EINVAL; 643 goto out; 644 } else { 645 *hasmask = 1; 646 *mask = aclent[i].a_perm; 647 } 648 } 649 } 650 651 if ((! *hasmask) && (*numuser + *numgroup > 1)) { 652 error = EINVAL; 653 goto out; 654 } 655 656 out: 657 return (error); 658 } 659 660 /* 661 * Convert an array of aclent_t into an array of nfsace entries, 662 * following POSIX draft -> nfsv4 conversion semantics as outlined in 663 * the IETF draft. 664 */ 665 static int 666 ln_aent_to_ace(aclent_t *aclent, int n, ace_t **acepp, int *rescount, int isdir) 667 { 668 int error = 0; 669 mode_t mask; 670 int numuser, numgroup, needsort; 671 int resultsize = 0; 672 int i, groupi = 0, skip; 673 ace_t *acep, *result = NULL; 674 int hasmask; 675 676 error = ln_aent_preprocess(aclent, n, &hasmask, &mask, 677 &numuser, &numgroup, &needsort); 678 if (error != 0) 679 goto out; 680 681 /* allow + deny for each aclent */ 682 resultsize = n * 2; 683 if (hasmask) { 684 /* 685 * stick extra deny on the group_obj and on each 686 * user|group for the mask (the group_obj was added 687 * into the count for numgroup) 688 */ 689 resultsize += numuser + numgroup; 690 /* ... and don't count the mask itself */ 691 resultsize -= 2; 692 } 693 694 /* sort the source if necessary */ 695 if (needsort) 696 ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls); 697 698 if (cacl_malloc((void **)&result, resultsize * sizeof (ace_t)) != 0) 699 goto out; 700 701 acep = result; 702 703 for (i = 0; i < n; i++) { 704 /* 705 * don't process CLASS_OBJ (mask); mask was grabbed in 706 * ln_aent_preprocess() 707 */ 708 if (aclent[i].a_type & CLASS_OBJ) 709 continue; 710 711 /* If we need an ACL_MASK emulator, prepend it now */ 712 if ((hasmask) && 713 (aclent[i].a_type & (USER | GROUP | GROUP_OBJ))) { 714 acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE; 715 acep->a_flags = 0; 716 if (aclent[i].a_type & GROUP_OBJ) { 717 acep->a_who = (uid_t)-1; 718 acep->a_flags |= 719 (ACE_IDENTIFIER_GROUP|ACE_GROUP); 720 } else if (aclent[i].a_type & USER) { 721 acep->a_who = aclent[i].a_id; 722 } else { 723 acep->a_who = aclent[i].a_id; 724 acep->a_flags |= ACE_IDENTIFIER_GROUP; 725 } 726 if (aclent[i].a_type & ACL_DEFAULT) { 727 acep->a_flags |= ACE_INHERIT_ONLY_ACE | 728 ACE_FILE_INHERIT_ACE | 729 ACE_DIRECTORY_INHERIT_ACE; 730 } 731 /* 732 * Set the access mask for the prepended deny 733 * ace. To do this, we invert the mask (found 734 * in ln_aent_preprocess()) then convert it to an 735 * DENY ace access_mask. 736 */ 737 acep->a_access_mask = mode_to_ace_access((mask ^ 07), 738 isdir, 0, 0); 739 acep += 1; 740 } 741 742 /* handle a_perm -> access_mask */ 743 acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm, 744 isdir, aclent[i].a_type & USER_OBJ, 1); 745 746 /* emulate a default aclent */ 747 if (aclent[i].a_type & ACL_DEFAULT) { 748 acep->a_flags |= ACE_INHERIT_ONLY_ACE | 749 ACE_FILE_INHERIT_ACE | 750 ACE_DIRECTORY_INHERIT_ACE; 751 } 752 753 /* 754 * handle a_perm and a_id 755 * 756 * this must be done last, since it involves the 757 * corresponding deny aces, which are handled 758 * differently for each different a_type. 759 */ 760 if (aclent[i].a_type & USER_OBJ) { 761 acep->a_who = (uid_t)-1; 762 acep->a_flags |= ACE_OWNER; 763 ace_make_deny(acep, acep + 1, isdir, B_TRUE); 764 acep += 2; 765 } else if (aclent[i].a_type & USER) { 766 acep->a_who = aclent[i].a_id; 767 ace_make_deny(acep, acep + 1, isdir, B_FALSE); 768 acep += 2; 769 } else if (aclent[i].a_type & (GROUP_OBJ | GROUP)) { 770 if (aclent[i].a_type & GROUP_OBJ) { 771 acep->a_who = (uid_t)-1; 772 acep->a_flags |= ACE_GROUP; 773 } else { 774 acep->a_who = aclent[i].a_id; 775 } 776 acep->a_flags |= ACE_IDENTIFIER_GROUP; 777 /* 778 * Set the corresponding deny for the group ace. 779 * 780 * The deny aces go after all of the groups, unlike 781 * everything else, where they immediately follow 782 * the allow ace. 783 * 784 * We calculate "skip", the number of slots to 785 * skip ahead for the deny ace, here. 786 * 787 * The pattern is: 788 * MD1 A1 MD2 A2 MD3 A3 D1 D2 D3 789 * thus, skip is 790 * (2 * numgroup) - 1 - groupi 791 * (2 * numgroup) to account for MD + A 792 * - 1 to account for the fact that we're on the 793 * access (A), not the mask (MD) 794 * - groupi to account for the fact that we have 795 * passed up groupi number of MD's. 796 */ 797 skip = (2 * numgroup) - 1 - groupi; 798 ace_make_deny(acep, acep + skip, isdir, B_FALSE); 799 /* 800 * If we just did the last group, skip acep past 801 * all of the denies; else, just move ahead one. 802 */ 803 if (++groupi >= numgroup) 804 acep += numgroup + 1; 805 else 806 acep += 1; 807 } else if (aclent[i].a_type & OTHER_OBJ) { 808 acep->a_who = (uid_t)-1; 809 acep->a_flags |= ACE_EVERYONE; 810 ace_make_deny(acep, acep + 1, isdir, B_FALSE); 811 acep += 2; 812 } else { 813 error = EINVAL; 814 goto out; 815 } 816 } 817 818 *acepp = result; 819 *rescount = resultsize; 820 821 out: 822 if (error != 0) { 823 if ((result != NULL) && (resultsize > 0)) { 824 cacl_free(result, resultsize * sizeof (ace_t)); 825 } 826 } 827 828 return (error); 829 } 830 831 static int 832 convert_aent_to_ace(aclent_t *aclentp, int aclcnt, int isdir, 833 ace_t **retacep, int *retacecnt) 834 { 835 ace_t *acep; 836 ace_t *dfacep; 837 int acecnt = 0; 838 int dfacecnt = 0; 839 int dfaclstart = 0; 840 int dfaclcnt = 0; 841 aclent_t *aclp; 842 int i; 843 int error; 844 int acesz, dfacesz; 845 846 ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls); 847 848 for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) { 849 if (aclp->a_type & ACL_DEFAULT) 850 break; 851 } 852 853 if (i < aclcnt) { 854 dfaclstart = i; 855 dfaclcnt = aclcnt - i; 856 } 857 858 if (dfaclcnt && isdir == 0) { 859 return (EINVAL); 860 } 861 862 error = ln_aent_to_ace(aclentp, i, &acep, &acecnt, isdir); 863 if (error) 864 return (error); 865 866 if (dfaclcnt) { 867 error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt, 868 &dfacep, &dfacecnt, isdir); 869 if (error) { 870 if (acep) { 871 cacl_free(acep, acecnt * sizeof (ace_t)); 872 } 873 return (error); 874 } 875 } 876 877 if (dfacecnt != 0) { 878 acesz = sizeof (ace_t) * acecnt; 879 dfacesz = sizeof (ace_t) * dfacecnt; 880 acep = cacl_realloc(acep, acesz, acesz + dfacesz); 881 if (acep == NULL) 882 return (ENOMEM); 883 if (dfaclcnt) { 884 (void) memcpy(acep + acecnt, dfacep, dfacesz); 885 } 886 } 887 if (dfaclcnt) 888 cacl_free(dfacep, dfacecnt * sizeof (ace_t)); 889 890 *retacecnt = acecnt + dfacecnt; 891 *retacep = acep; 892 return (0); 893 } 894 895 static int 896 ace_mask_to_mode(uint32_t mask, o_mode_t *modep, int isdir) 897 { 898 int error = 0; 899 o_mode_t mode = 0; 900 uint32_t bits, wantbits; 901 902 /* read */ 903 if (mask & ACE_READ_DATA) 904 mode |= S_IROTH; 905 906 /* write */ 907 wantbits = (ACE_WRITE_DATA | ACE_APPEND_DATA); 908 if (isdir) 909 wantbits |= ACE_DELETE_CHILD; 910 bits = mask & wantbits; 911 if (bits != 0) { 912 if (bits != wantbits) { 913 error = ENOTSUP; 914 goto out; 915 } 916 mode |= S_IWOTH; 917 } 918 919 /* exec */ 920 if (mask & ACE_EXECUTE) { 921 mode |= S_IXOTH; 922 } 923 924 *modep = mode; 925 926 out: 927 return (error); 928 } 929 930 static void 931 acevals_init(acevals_t *vals, uid_t key) 932 { 933 bzero(vals, sizeof (*vals)); 934 vals->allowed = ACE_MASK_UNDEFINED; 935 vals->denied = ACE_MASK_UNDEFINED; 936 vals->mask = ACE_MASK_UNDEFINED; 937 vals->key = key; 938 } 939 940 static void 941 ace_list_init(ace_list_t *al, int dfacl_flag) 942 { 943 acevals_init(&al->user_obj, NULL); 944 acevals_init(&al->group_obj, NULL); 945 acevals_init(&al->other_obj, NULL); 946 al->numusers = 0; 947 al->numgroups = 0; 948 al->acl_mask = 0; 949 al->hasmask = 0; 950 al->state = ace_unused; 951 al->seen = 0; 952 al->dfacl_flag = dfacl_flag; 953 } 954 955 /* 956 * Find or create an acevals holder for a given id and avl tree. 957 * 958 * Note that only one thread will ever touch these avl trees, so 959 * there is no need for locking. 960 */ 961 static acevals_t * 962 acevals_find(ace_t *ace, avl_tree_t *avl, int *num) 963 { 964 acevals_t key, *rc; 965 avl_index_t where; 966 967 key.key = ace->a_who; 968 rc = avl_find(avl, &key, &where); 969 if (rc != NULL) 970 return (rc); 971 972 /* this memory is freed by ln_ace_to_aent()->ace_list_free() */ 973 if (cacl_malloc((void **)&rc, sizeof (acevals_t)) != 0) 974 return (NULL); 975 976 acevals_init(rc, ace->a_who); 977 avl_insert(avl, rc, where); 978 (*num)++; 979 980 return (rc); 981 } 982 983 static int 984 access_mask_check(ace_t *acep, int mask_bit, int isowner) 985 { 986 int set_deny, err_deny; 987 int set_allow, err_allow; 988 int acl_consume; 989 int haswriteperm, hasreadperm; 990 991 if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) { 992 haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 0 : 1; 993 hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 0 : 1; 994 } else { 995 haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 1 : 0; 996 hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 1 : 0; 997 } 998 999 acl_consume = (ACL_SYNCHRONIZE_ERR_DENY | 1000 ACL_DELETE_ERR_DENY | 1001 ACL_WRITE_OWNER_ERR_DENY | 1002 ACL_WRITE_OWNER_ERR_ALLOW | 1003 ACL_WRITE_ATTRS_OWNER_SET_ALLOW | 1004 ACL_WRITE_ATTRS_OWNER_ERR_DENY | 1005 ACL_WRITE_ATTRS_WRITER_SET_DENY | 1006 ACL_WRITE_ATTRS_WRITER_ERR_ALLOW | 1007 ACL_WRITE_NAMED_WRITER_ERR_DENY | 1008 ACL_READ_NAMED_READER_ERR_DENY); 1009 1010 if (mask_bit == ACE_SYNCHRONIZE) { 1011 set_deny = ACL_SYNCHRONIZE_SET_DENY; 1012 err_deny = ACL_SYNCHRONIZE_ERR_DENY; 1013 set_allow = ACL_SYNCHRONIZE_SET_ALLOW; 1014 err_allow = ACL_SYNCHRONIZE_ERR_ALLOW; 1015 } else if (mask_bit == ACE_WRITE_OWNER) { 1016 set_deny = ACL_WRITE_OWNER_SET_DENY; 1017 err_deny = ACL_WRITE_OWNER_ERR_DENY; 1018 set_allow = ACL_WRITE_OWNER_SET_ALLOW; 1019 err_allow = ACL_WRITE_OWNER_ERR_ALLOW; 1020 } else if (mask_bit == ACE_DELETE) { 1021 set_deny = ACL_DELETE_SET_DENY; 1022 err_deny = ACL_DELETE_ERR_DENY; 1023 set_allow = ACL_DELETE_SET_ALLOW; 1024 err_allow = ACL_DELETE_ERR_ALLOW; 1025 } else if (mask_bit == ACE_WRITE_ATTRIBUTES) { 1026 if (isowner) { 1027 set_deny = ACL_WRITE_ATTRS_OWNER_SET_DENY; 1028 err_deny = ACL_WRITE_ATTRS_OWNER_ERR_DENY; 1029 set_allow = ACL_WRITE_ATTRS_OWNER_SET_ALLOW; 1030 err_allow = ACL_WRITE_ATTRS_OWNER_ERR_ALLOW; 1031 } else if (haswriteperm) { 1032 set_deny = ACL_WRITE_ATTRS_WRITER_SET_DENY; 1033 err_deny = ACL_WRITE_ATTRS_WRITER_ERR_DENY; 1034 set_allow = ACL_WRITE_ATTRS_WRITER_SET_ALLOW; 1035 err_allow = ACL_WRITE_ATTRS_WRITER_ERR_ALLOW; 1036 } else { 1037 if ((acep->a_access_mask & mask_bit) && 1038 (acep->a_type & ACE_ACCESS_ALLOWED_ACE_TYPE)) { 1039 return (ENOTSUP); 1040 } 1041 return (0); 1042 } 1043 } else if (mask_bit == ACE_READ_NAMED_ATTRS) { 1044 if (!hasreadperm) 1045 return (0); 1046 1047 set_deny = ACL_READ_NAMED_READER_SET_DENY; 1048 err_deny = ACL_READ_NAMED_READER_ERR_DENY; 1049 set_allow = ACL_READ_NAMED_READER_SET_ALLOW; 1050 err_allow = ACL_READ_NAMED_READER_ERR_ALLOW; 1051 } else if (mask_bit == ACE_WRITE_NAMED_ATTRS) { 1052 if (!haswriteperm) 1053 return (0); 1054 1055 set_deny = ACL_WRITE_NAMED_WRITER_SET_DENY; 1056 err_deny = ACL_WRITE_NAMED_WRITER_ERR_DENY; 1057 set_allow = ACL_WRITE_NAMED_WRITER_SET_ALLOW; 1058 err_allow = ACL_WRITE_NAMED_WRITER_ERR_ALLOW; 1059 } else { 1060 return (EINVAL); 1061 } 1062 1063 if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) { 1064 if (acl_consume & set_deny) { 1065 if (!(acep->a_access_mask & mask_bit)) { 1066 return (ENOTSUP); 1067 } 1068 } else if (acl_consume & err_deny) { 1069 if (acep->a_access_mask & mask_bit) { 1070 return (ENOTSUP); 1071 } 1072 } 1073 } else { 1074 /* ACE_ACCESS_ALLOWED_ACE_TYPE */ 1075 if (acl_consume & set_allow) { 1076 if (!(acep->a_access_mask & mask_bit)) { 1077 return (ENOTSUP); 1078 } 1079 } else if (acl_consume & err_allow) { 1080 if (acep->a_access_mask & mask_bit) { 1081 return (ENOTSUP); 1082 } 1083 } 1084 } 1085 return (0); 1086 } 1087 1088 static int 1089 ace_to_aent_legal(ace_t *acep) 1090 { 1091 int error = 0; 1092 int isowner; 1093 1094 /* only ALLOW or DENY */ 1095 if ((acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE) && 1096 (acep->a_type != ACE_ACCESS_DENIED_ACE_TYPE)) { 1097 error = ENOTSUP; 1098 goto out; 1099 } 1100 1101 /* check for invalid flags */ 1102 if (acep->a_flags & ~(ACE_VALID_FLAG_BITS)) { 1103 error = EINVAL; 1104 goto out; 1105 } 1106 1107 /* some flags are illegal */ 1108 if (acep->a_flags & (ACE_SUCCESSFUL_ACCESS_ACE_FLAG | 1109 ACE_FAILED_ACCESS_ACE_FLAG | 1110 ACE_NO_PROPAGATE_INHERIT_ACE)) { 1111 error = ENOTSUP; 1112 goto out; 1113 } 1114 1115 /* check for invalid masks */ 1116 if (acep->a_access_mask & ~(ACE_VALID_MASK_BITS)) { 1117 error = EINVAL; 1118 goto out; 1119 } 1120 1121 if ((acep->a_flags & ACE_OWNER)) { 1122 isowner = 1; 1123 } else { 1124 isowner = 0; 1125 } 1126 1127 error = access_mask_check(acep, ACE_SYNCHRONIZE, isowner); 1128 if (error) 1129 goto out; 1130 1131 error = access_mask_check(acep, ACE_WRITE_OWNER, isowner); 1132 if (error) 1133 goto out; 1134 1135 error = access_mask_check(acep, ACE_DELETE, isowner); 1136 if (error) 1137 goto out; 1138 1139 error = access_mask_check(acep, ACE_WRITE_ATTRIBUTES, isowner); 1140 if (error) 1141 goto out; 1142 1143 error = access_mask_check(acep, ACE_READ_NAMED_ATTRS, isowner); 1144 if (error) 1145 goto out; 1146 1147 error = access_mask_check(acep, ACE_WRITE_NAMED_ATTRS, isowner); 1148 if (error) 1149 goto out; 1150 1151 /* more detailed checking of masks */ 1152 if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) { 1153 if (! (acep->a_access_mask & ACE_READ_ATTRIBUTES)) { 1154 error = ENOTSUP; 1155 goto out; 1156 } 1157 if ((acep->a_access_mask & ACE_WRITE_DATA) && 1158 (! (acep->a_access_mask & ACE_APPEND_DATA))) { 1159 error = ENOTSUP; 1160 goto out; 1161 } 1162 if ((! (acep->a_access_mask & ACE_WRITE_DATA)) && 1163 (acep->a_access_mask & ACE_APPEND_DATA)) { 1164 error = ENOTSUP; 1165 goto out; 1166 } 1167 } 1168 1169 /* ACL enforcement */ 1170 if ((acep->a_access_mask & ACE_READ_ACL) && 1171 (acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE)) { 1172 error = ENOTSUP; 1173 goto out; 1174 } 1175 if (acep->a_access_mask & ACE_WRITE_ACL) { 1176 if ((acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) && 1177 (isowner)) { 1178 error = ENOTSUP; 1179 goto out; 1180 } 1181 if ((acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) && 1182 (! isowner)) { 1183 error = ENOTSUP; 1184 goto out; 1185 } 1186 } 1187 1188 out: 1189 return (error); 1190 } 1191 1192 static int 1193 ace_allow_to_mode(uint32_t mask, o_mode_t *modep, int isdir) 1194 { 1195 /* ACE_READ_ACL and ACE_READ_ATTRIBUTES must both be set */ 1196 if ((mask & (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) != 1197 (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) { 1198 return (ENOTSUP); 1199 } 1200 1201 return (ace_mask_to_mode(mask, modep, isdir)); 1202 } 1203 1204 static int 1205 acevals_to_aent(acevals_t *vals, aclent_t *dest, ace_list_t *list, 1206 uid_t owner, gid_t group, int isdir) 1207 { 1208 int error; 1209 uint32_t flips = ACE_POSIX_SUPPORTED_BITS; 1210 1211 if (isdir) 1212 flips |= ACE_DELETE_CHILD; 1213 if (vals->allowed != (vals->denied ^ flips)) { 1214 error = ENOTSUP; 1215 goto out; 1216 } 1217 if ((list->hasmask) && (list->acl_mask != vals->mask) && 1218 (vals->aent_type & (USER | GROUP | GROUP_OBJ))) { 1219 error = ENOTSUP; 1220 goto out; 1221 } 1222 error = ace_allow_to_mode(vals->allowed, &dest->a_perm, isdir); 1223 if (error != 0) 1224 goto out; 1225 dest->a_type = vals->aent_type; 1226 if (dest->a_type & (USER | GROUP)) { 1227 dest->a_id = vals->key; 1228 } else if (dest->a_type & USER_OBJ) { 1229 dest->a_id = owner; 1230 } else if (dest->a_type & GROUP_OBJ) { 1231 dest->a_id = group; 1232 } else if (dest->a_type & OTHER_OBJ) { 1233 dest->a_id = 0; 1234 } else { 1235 error = EINVAL; 1236 goto out; 1237 } 1238 1239 out: 1240 return (error); 1241 } 1242 1243 1244 static int 1245 ace_list_to_aent(ace_list_t *list, aclent_t **aclentp, int *aclcnt, 1246 uid_t owner, gid_t group, int isdir) 1247 { 1248 int error = 0; 1249 aclent_t *aent, *result = NULL; 1250 acevals_t *vals; 1251 int resultcount; 1252 1253 if ((list->seen & (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) != 1254 (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) { 1255 error = ENOTSUP; 1256 goto out; 1257 } 1258 if ((! list->hasmask) && (list->numusers + list->numgroups > 0)) { 1259 error = ENOTSUP; 1260 goto out; 1261 } 1262 1263 resultcount = 3 + list->numusers + list->numgroups; 1264 /* 1265 * This must be the same condition as below, when we add the CLASS_OBJ 1266 * (aka ACL mask) 1267 */ 1268 if ((list->hasmask) || (! list->dfacl_flag)) 1269 resultcount += 1; 1270 1271 if (cacl_malloc((void **)&result, 1272 resultcount * sizeof (aclent_t)) != 0) { 1273 error = ENOMEM; 1274 goto out; 1275 } 1276 aent = result; 1277 1278 /* USER_OBJ */ 1279 if (!(list->user_obj.aent_type & USER_OBJ)) { 1280 error = EINVAL; 1281 goto out; 1282 } 1283 1284 error = acevals_to_aent(&list->user_obj, aent, list, owner, group, 1285 isdir); 1286 1287 if (error != 0) 1288 goto out; 1289 ++aent; 1290 /* USER */ 1291 vals = NULL; 1292 for (vals = avl_first(&list->user); vals != NULL; 1293 vals = AVL_NEXT(&list->user, vals)) { 1294 if (!(vals->aent_type & USER)) { 1295 error = EINVAL; 1296 goto out; 1297 } 1298 error = acevals_to_aent(vals, aent, list, owner, group, 1299 isdir); 1300 if (error != 0) 1301 goto out; 1302 ++aent; 1303 } 1304 /* GROUP_OBJ */ 1305 if (!(list->group_obj.aent_type & GROUP_OBJ)) { 1306 error = EINVAL; 1307 goto out; 1308 } 1309 error = acevals_to_aent(&list->group_obj, aent, list, owner, group, 1310 isdir); 1311 if (error != 0) 1312 goto out; 1313 ++aent; 1314 /* GROUP */ 1315 vals = NULL; 1316 for (vals = avl_first(&list->group); vals != NULL; 1317 vals = AVL_NEXT(&list->group, vals)) { 1318 if (!(vals->aent_type & GROUP)) { 1319 error = EINVAL; 1320 goto out; 1321 } 1322 error = acevals_to_aent(vals, aent, list, owner, group, 1323 isdir); 1324 if (error != 0) 1325 goto out; 1326 ++aent; 1327 } 1328 /* 1329 * CLASS_OBJ (aka ACL_MASK) 1330 * 1331 * An ACL_MASK is not fabricated if the ACL is a default ACL. 1332 * This is to follow UFS's behavior. 1333 */ 1334 if ((list->hasmask) || (! list->dfacl_flag)) { 1335 if (list->hasmask) { 1336 uint32_t flips = ACE_POSIX_SUPPORTED_BITS; 1337 if (isdir) 1338 flips |= ACE_DELETE_CHILD; 1339 error = ace_mask_to_mode(list->acl_mask ^ flips, 1340 &aent->a_perm, isdir); 1341 if (error != 0) 1342 goto out; 1343 } else { 1344 /* fabricate the ACL_MASK from the group permissions */ 1345 error = ace_mask_to_mode(list->group_obj.allowed, 1346 &aent->a_perm, isdir); 1347 if (error != 0) 1348 goto out; 1349 } 1350 aent->a_id = 0; 1351 aent->a_type = CLASS_OBJ | list->dfacl_flag; 1352 ++aent; 1353 } 1354 /* OTHER_OBJ */ 1355 if (!(list->other_obj.aent_type & OTHER_OBJ)) { 1356 error = EINVAL; 1357 goto out; 1358 } 1359 error = acevals_to_aent(&list->other_obj, aent, list, owner, group, 1360 isdir); 1361 if (error != 0) 1362 goto out; 1363 ++aent; 1364 1365 *aclentp = result; 1366 *aclcnt = resultcount; 1367 1368 out: 1369 if (error != 0) { 1370 if (result != NULL) 1371 cacl_free(result, resultcount * sizeof (aclent_t)); 1372 } 1373 1374 return (error); 1375 } 1376 1377 1378 /* 1379 * free all data associated with an ace_list 1380 */ 1381 static void 1382 ace_list_free(ace_list_t *al) 1383 { 1384 acevals_t *node; 1385 void *cookie; 1386 1387 if (al == NULL) 1388 return; 1389 1390 cookie = NULL; 1391 while ((node = avl_destroy_nodes(&al->user, &cookie)) != NULL) 1392 cacl_free(node, sizeof (acevals_t)); 1393 cookie = NULL; 1394 while ((node = avl_destroy_nodes(&al->group, &cookie)) != NULL) 1395 cacl_free(node, sizeof (acevals_t)); 1396 1397 avl_destroy(&al->user); 1398 avl_destroy(&al->group); 1399 1400 /* free the container itself */ 1401 cacl_free(al, sizeof (ace_list_t)); 1402 } 1403 1404 static int 1405 acevals_compare(const void *va, const void *vb) 1406 { 1407 const acevals_t *a = va, *b = vb; 1408 1409 if (a->key == b->key) 1410 return (0); 1411 1412 if (a->key > b->key) 1413 return (1); 1414 1415 else 1416 return (-1); 1417 } 1418 1419 /* 1420 * Convert a list of ace_t entries to equivalent regular and default 1421 * aclent_t lists. Return error (ENOTSUP) when conversion is not possible. 1422 */ 1423 static int 1424 ln_ace_to_aent(ace_t *ace, int n, uid_t owner, gid_t group, 1425 aclent_t **aclentp, int *aclcnt, aclent_t **dfaclentp, int *dfaclcnt, 1426 int isdir) 1427 { 1428 int error = 0; 1429 ace_t *acep; 1430 uint32_t bits; 1431 int i; 1432 ace_list_t *normacl = NULL, *dfacl = NULL, *acl; 1433 acevals_t *vals; 1434 1435 *aclentp = NULL; 1436 *aclcnt = 0; 1437 *dfaclentp = NULL; 1438 *dfaclcnt = 0; 1439 1440 /* we need at least user_obj, group_obj, and other_obj */ 1441 if (n < 6) { 1442 error = ENOTSUP; 1443 goto out; 1444 } 1445 if (ace == NULL) { 1446 error = EINVAL; 1447 goto out; 1448 } 1449 1450 error = cacl_malloc((void **)&normacl, sizeof (ace_list_t)); 1451 if (error != 0) 1452 goto out; 1453 1454 avl_create(&normacl->user, acevals_compare, sizeof (acevals_t), 1455 offsetof(acevals_t, avl)); 1456 avl_create(&normacl->group, acevals_compare, sizeof (acevals_t), 1457 offsetof(acevals_t, avl)); 1458 1459 ace_list_init(normacl, 0); 1460 1461 error = cacl_malloc((void **)&dfacl, sizeof (ace_list_t)); 1462 if (error != 0) 1463 goto out; 1464 1465 avl_create(&dfacl->user, acevals_compare, sizeof (acevals_t), 1466 offsetof(acevals_t, avl)); 1467 avl_create(&dfacl->group, acevals_compare, sizeof (acevals_t), 1468 offsetof(acevals_t, avl)); 1469 ace_list_init(dfacl, ACL_DEFAULT); 1470 1471 /* process every ace_t... */ 1472 for (i = 0; i < n; i++) { 1473 acep = &ace[i]; 1474 1475 /* rule out certain cases quickly */ 1476 error = ace_to_aent_legal(acep); 1477 if (error != 0) 1478 goto out; 1479 1480 /* 1481 * Turn off these bits in order to not have to worry about 1482 * them when doing the checks for compliments. 1483 */ 1484 acep->a_access_mask &= ~(ACE_WRITE_OWNER | ACE_DELETE | 1485 ACE_SYNCHRONIZE | ACE_WRITE_ATTRIBUTES | 1486 ACE_READ_NAMED_ATTRS | ACE_WRITE_NAMED_ATTRS); 1487 1488 /* see if this should be a regular or default acl */ 1489 bits = acep->a_flags & 1490 (ACE_INHERIT_ONLY_ACE | 1491 ACE_FILE_INHERIT_ACE | 1492 ACE_DIRECTORY_INHERIT_ACE); 1493 if (bits != 0) { 1494 /* all or nothing on these inherit bits */ 1495 if (bits != (ACE_INHERIT_ONLY_ACE | 1496 ACE_FILE_INHERIT_ACE | 1497 ACE_DIRECTORY_INHERIT_ACE)) { 1498 error = ENOTSUP; 1499 goto out; 1500 } 1501 acl = dfacl; 1502 } else { 1503 acl = normacl; 1504 } 1505 1506 if ((acep->a_flags & ACE_OWNER)) { 1507 if (acl->state > ace_user_obj) { 1508 error = ENOTSUP; 1509 goto out; 1510 } 1511 acl->state = ace_user_obj; 1512 acl->seen |= USER_OBJ; 1513 vals = &acl->user_obj; 1514 vals->aent_type = USER_OBJ | acl->dfacl_flag; 1515 } else if ((acep->a_flags & ACE_EVERYONE)) { 1516 acl->state = ace_other_obj; 1517 acl->seen |= OTHER_OBJ; 1518 vals = &acl->other_obj; 1519 vals->aent_type = OTHER_OBJ | acl->dfacl_flag; 1520 } else if (acep->a_flags & ACE_IDENTIFIER_GROUP) { 1521 if (acl->state > ace_group) { 1522 error = ENOTSUP; 1523 goto out; 1524 } 1525 if ((acep->a_flags & ACE_GROUP)) { 1526 acl->seen |= GROUP_OBJ; 1527 vals = &acl->group_obj; 1528 vals->aent_type = GROUP_OBJ | acl->dfacl_flag; 1529 } else { 1530 acl->seen |= GROUP; 1531 vals = acevals_find(acep, &acl->group, 1532 &acl->numgroups); 1533 if (vals == NULL) { 1534 error = ENOMEM; 1535 goto out; 1536 } 1537 vals->aent_type = GROUP | acl->dfacl_flag; 1538 } 1539 acl->state = ace_group; 1540 } else { 1541 if (acl->state > ace_user) { 1542 error = ENOTSUP; 1543 goto out; 1544 } 1545 acl->state = ace_user; 1546 acl->seen |= USER; 1547 vals = acevals_find(acep, &acl->user, 1548 &acl->numusers); 1549 if (vals == NULL) { 1550 error = ENOMEM; 1551 goto out; 1552 } 1553 vals->aent_type = USER | acl->dfacl_flag; 1554 } 1555 1556 if (!(acl->state > ace_unused)) { 1557 error = EINVAL; 1558 goto out; 1559 } 1560 1561 if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) { 1562 /* no more than one allowed per aclent_t */ 1563 if (vals->allowed != ACE_MASK_UNDEFINED) { 1564 error = ENOTSUP; 1565 goto out; 1566 } 1567 vals->allowed = acep->a_access_mask; 1568 } else { 1569 /* 1570 * it's a DENY; if there was a previous DENY, it 1571 * must have been an ACL_MASK. 1572 */ 1573 if (vals->denied != ACE_MASK_UNDEFINED) { 1574 /* ACL_MASK is for USER and GROUP only */ 1575 if ((acl->state != ace_user) && 1576 (acl->state != ace_group)) { 1577 error = ENOTSUP; 1578 goto out; 1579 } 1580 1581 if (! acl->hasmask) { 1582 acl->hasmask = 1; 1583 acl->acl_mask = vals->denied; 1584 /* check for mismatched ACL_MASK emulations */ 1585 } else if (acl->acl_mask != vals->denied) { 1586 error = ENOTSUP; 1587 goto out; 1588 } 1589 vals->mask = vals->denied; 1590 } 1591 vals->denied = acep->a_access_mask; 1592 } 1593 } 1594 1595 /* done collating; produce the aclent_t lists */ 1596 if (normacl->state != ace_unused) { 1597 error = ace_list_to_aent(normacl, aclentp, aclcnt, 1598 owner, group, isdir); 1599 if (error != 0) { 1600 goto out; 1601 } 1602 } 1603 if (dfacl->state != ace_unused) { 1604 error = ace_list_to_aent(dfacl, dfaclentp, dfaclcnt, 1605 owner, group, isdir); 1606 if (error != 0) { 1607 goto out; 1608 } 1609 } 1610 1611 out: 1612 if (normacl != NULL) 1613 ace_list_free(normacl); 1614 if (dfacl != NULL) 1615 ace_list_free(dfacl); 1616 1617 return (error); 1618 } 1619 1620 static int 1621 convert_ace_to_aent(ace_t *acebufp, int acecnt, int isdir, 1622 uid_t owner, gid_t group, aclent_t **retaclentp, int *retaclcnt) 1623 { 1624 int error = 0; 1625 aclent_t *aclentp, *dfaclentp; 1626 int aclcnt, dfaclcnt; 1627 int aclsz, dfaclsz; 1628 1629 error = ln_ace_to_aent(acebufp, acecnt, owner, group, 1630 &aclentp, &aclcnt, &dfaclentp, &dfaclcnt, isdir); 1631 1632 if (error) 1633 return (error); 1634 1635 1636 if (dfaclcnt != 0) { 1637 /* 1638 * Slap aclentp and dfaclentp into a single array. 1639 */ 1640 aclsz = sizeof (aclent_t) * aclcnt; 1641 dfaclsz = sizeof (aclent_t) * dfaclcnt; 1642 aclentp = cacl_realloc(aclentp, aclsz, aclsz + dfaclsz); 1643 if (aclentp != NULL) { 1644 (void) memcpy(aclentp + aclcnt, dfaclentp, dfaclsz); 1645 } else { 1646 error = ENOMEM; 1647 } 1648 } 1649 1650 if (aclentp) { 1651 *retaclentp = aclentp; 1652 *retaclcnt = aclcnt + dfaclcnt; 1653 } 1654 1655 if (dfaclentp) 1656 cacl_free(dfaclentp, dfaclsz); 1657 1658 return (error); 1659 } 1660 1661 1662 int 1663 acl_translate(acl_t *aclp, int target_flavor, int isdir, uid_t owner, 1664 gid_t group) 1665 { 1666 int aclcnt; 1667 void *acldata; 1668 int error; 1669 1670 /* 1671 * See if we need to translate 1672 */ 1673 if ((target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACE_T) || 1674 (target_flavor == _ACL_ACLENT_ENABLED && 1675 aclp->acl_type == ACLENT_T)) 1676 return (0); 1677 1678 if (target_flavor == -1) { 1679 error = EINVAL; 1680 goto out; 1681 } 1682 1683 if (target_flavor == _ACL_ACE_ENABLED && 1684 aclp->acl_type == ACLENT_T) { 1685 error = convert_aent_to_ace(aclp->acl_aclp, 1686 aclp->acl_cnt, isdir, (ace_t **)&acldata, &aclcnt); 1687 if (error) 1688 goto out; 1689 1690 } else if (target_flavor == _ACL_ACLENT_ENABLED && 1691 aclp->acl_type == ACE_T) { 1692 error = convert_ace_to_aent(aclp->acl_aclp, aclp->acl_cnt, 1693 isdir, owner, group, (aclent_t **)&acldata, &aclcnt); 1694 if (error) 1695 goto out; 1696 } else { 1697 error = ENOTSUP; 1698 goto out; 1699 } 1700 1701 /* 1702 * replace old acl with newly translated acl 1703 */ 1704 cacl_free(aclp->acl_aclp, aclp->acl_cnt * aclp->acl_entry_size); 1705 aclp->acl_aclp = acldata; 1706 aclp->acl_cnt = aclcnt; 1707 if (target_flavor == _ACL_ACE_ENABLED) { 1708 aclp->acl_type = ACE_T; 1709 aclp->acl_entry_size = sizeof (ace_t); 1710 } else { 1711 aclp->acl_type = ACLENT_T; 1712 aclp->acl_entry_size = sizeof (aclent_t); 1713 } 1714 return (0); 1715 1716 out: 1717 1718 #if !defined(_KERNEL) 1719 errno = error; 1720 return (-1); 1721 #else 1722 return (error); 1723 #endif 1724 } 1725
Indexes created Wed Feb 10 04:24:43 UTC 2010
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