1/* 2 * Common NFSv4 ACL handling code. 3 * 4 * Copyright (c) 2002, 2003 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Marius Aamodt Eriksen <marius@umich.edu> 8 * Jeff Sedlak <jsedlak@umich.edu> 9 * J. Bruce Fields <bfields@umich.edu> 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37#include <linux/slab.h> 38#include <linux/nfs_fs.h> 39#include <linux/nfs4_acl.h> 40 41 42/* mode bit translations: */ 43#define NFS4_READ_MODE (NFS4_ACE_READ_DATA) 44#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA) 45#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE 46#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE) 47#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL) 48 49/* We don't support these bits; insist they be neither allowed nor denied */ 50#define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \ 51 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS) 52 53/* flags used to simulate posix default ACLs */ 54#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \ 55 | NFS4_ACE_DIRECTORY_INHERIT_ACE) 56 57#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \ 58 | NFS4_ACE_INHERIT_ONLY_ACE \ 59 | NFS4_ACE_IDENTIFIER_GROUP) 60 61#define MASK_EQUAL(mask1, mask2) \ 62 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) ) 63 64static u32 65mask_from_posix(unsigned short perm, unsigned int flags) 66{ 67 int mask = NFS4_ANYONE_MODE; 68 69 if (flags & NFS4_ACL_OWNER) 70 mask |= NFS4_OWNER_MODE; 71 if (perm & ACL_READ) 72 mask |= NFS4_READ_MODE; 73 if (perm & ACL_WRITE) 74 mask |= NFS4_WRITE_MODE; 75 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) 76 mask |= NFS4_ACE_DELETE_CHILD; 77 if (perm & ACL_EXECUTE) 78 mask |= NFS4_EXECUTE_MODE; 79 return mask; 80} 81 82static u32 83deny_mask_from_posix(unsigned short perm, u32 flags) 84{ 85 u32 mask = 0; 86 87 if (perm & ACL_READ) 88 mask |= NFS4_READ_MODE; 89 if (perm & ACL_WRITE) 90 mask |= NFS4_WRITE_MODE; 91 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR)) 92 mask |= NFS4_ACE_DELETE_CHILD; 93 if (perm & ACL_EXECUTE) 94 mask |= NFS4_EXECUTE_MODE; 95 return mask; 96} 97 98 99/* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the 100 * side of being more restrictive, so the mode bit mapping below is 101 * pessimistic. An optimistic version would be needed to handle DENY's, 102 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode 103 * bits. */ 104 105static void 106low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags) 107{ 108 u32 write_mode = NFS4_WRITE_MODE; 109 110 if (flags & NFS4_ACL_DIR) 111 write_mode |= NFS4_ACE_DELETE_CHILD; 112 *mode = 0; 113 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE) 114 *mode |= ACL_READ; 115 if ((perm & write_mode) == write_mode) 116 *mode |= ACL_WRITE; 117 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE) 118 *mode |= ACL_EXECUTE; 119} 120 121struct ace_container { 122 struct nfs4_ace *ace; 123 struct list_head ace_l; 124}; 125 126static short ace2type(struct nfs4_ace *); 127static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, 128 unsigned int); 129 130struct nfs4_acl * 131nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl, 132 unsigned int flags) 133{ 134 struct nfs4_acl *acl; 135 int size = 0; 136 137 if (pacl) { 138 if (posix_acl_valid(pacl) < 0) 139 return ERR_PTR(-EINVAL); 140 size += 2*pacl->a_count; 141 } 142 if (dpacl) { 143 if (posix_acl_valid(dpacl) < 0) 144 return ERR_PTR(-EINVAL); 145 size += 2*dpacl->a_count; 146 } 147 148 /* Allocate for worst case: one (deny, allow) pair each: */ 149 acl = nfs4_acl_new(size); 150 if (acl == NULL) 151 return ERR_PTR(-ENOMEM); 152 153 if (pacl) 154 _posix_to_nfsv4_one(pacl, acl, flags & ~NFS4_ACL_TYPE_DEFAULT); 155 156 if (dpacl) 157 _posix_to_nfsv4_one(dpacl, acl, flags | NFS4_ACL_TYPE_DEFAULT); 158 159 return acl; 160} 161 162struct posix_acl_summary { 163 unsigned short owner; 164 unsigned short users; 165 unsigned short group; 166 unsigned short groups; 167 unsigned short other; 168 unsigned short mask; 169}; 170 171static void 172summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas) 173{ 174 struct posix_acl_entry *pa, *pe; 175 176 /* 177 * Only pas.users and pas.groups need initialization; previous 178 * posix_acl_valid() calls ensure that the other fields will be 179 * initialized in the following loop. But, just to placate gcc: 180 */ 181 memset(pas, 0, sizeof(*pas)); 182 pas->mask = 07; 183 184 pe = acl->a_entries + acl->a_count; 185 186 FOREACH_ACL_ENTRY(pa, acl, pe) { 187 switch (pa->e_tag) { 188 case ACL_USER_OBJ: 189 pas->owner = pa->e_perm; 190 break; 191 case ACL_GROUP_OBJ: 192 pas->group = pa->e_perm; 193 break; 194 case ACL_USER: 195 pas->users |= pa->e_perm; 196 break; 197 case ACL_GROUP: 198 pas->groups |= pa->e_perm; 199 break; 200 case ACL_OTHER: 201 pas->other = pa->e_perm; 202 break; 203 case ACL_MASK: 204 pas->mask = pa->e_perm; 205 break; 206 } 207 } 208 /* We'll only care about effective permissions: */ 209 pas->users &= pas->mask; 210 pas->group &= pas->mask; 211 pas->groups &= pas->mask; 212} 213 214/* We assume the acl has been verified with posix_acl_valid. */ 215static void 216_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl, 217 unsigned int flags) 218{ 219 struct posix_acl_entry *pa, *group_owner_entry; 220 struct nfs4_ace *ace; 221 struct posix_acl_summary pas; 222 unsigned short deny; 223 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ? 224 NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0); 225 226 BUG_ON(pacl->a_count < 3); 227 summarize_posix_acl(pacl, &pas); 228 229 pa = pacl->a_entries; 230 ace = acl->aces + acl->naces; 231 232 /* We could deny everything not granted by the owner: */ 233 deny = ~pas.owner; 234 /* 235 * but it is equivalent (and simpler) to deny only what is not 236 * granted by later entries: 237 */ 238 deny &= pas.users | pas.group | pas.groups | pas.other; 239 if (deny) { 240 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; 241 ace->flag = eflag; 242 ace->access_mask = deny_mask_from_posix(deny, flags); 243 ace->whotype = NFS4_ACL_WHO_OWNER; 244 ace++; 245 acl->naces++; 246 } 247 248 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; 249 ace->flag = eflag; 250 ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER); 251 ace->whotype = NFS4_ACL_WHO_OWNER; 252 ace++; 253 acl->naces++; 254 pa++; 255 256 while (pa->e_tag == ACL_USER) { 257 deny = ~(pa->e_perm & pas.mask); 258 deny &= pas.groups | pas.group | pas.other; 259 if (deny) { 260 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; 261 ace->flag = eflag; 262 ace->access_mask = deny_mask_from_posix(deny, flags); 263 ace->whotype = NFS4_ACL_WHO_NAMED; 264 ace->who = pa->e_id; 265 ace++; 266 acl->naces++; 267 } 268 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; 269 ace->flag = eflag; 270 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, 271 flags); 272 ace->whotype = NFS4_ACL_WHO_NAMED; 273 ace->who = pa->e_id; 274 ace++; 275 acl->naces++; 276 pa++; 277 } 278 279 /* In the case of groups, we apply allow ACEs first, then deny ACEs, 280 * since a user can be in more than one group. */ 281 282 /* allow ACEs */ 283 284 group_owner_entry = pa; 285 286 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; 287 ace->flag = eflag; 288 ace->access_mask = mask_from_posix(pas.group, flags); 289 ace->whotype = NFS4_ACL_WHO_GROUP; 290 ace++; 291 acl->naces++; 292 pa++; 293 294 while (pa->e_tag == ACL_GROUP) { 295 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; 296 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; 297 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask, 298 flags); 299 ace->whotype = NFS4_ACL_WHO_NAMED; 300 ace->who = pa->e_id; 301 ace++; 302 acl->naces++; 303 pa++; 304 } 305 306 /* deny ACEs */ 307 308 pa = group_owner_entry; 309 310 deny = ~pas.group & pas.other; 311 if (deny) { 312 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; 313 ace->flag = eflag; 314 ace->access_mask = deny_mask_from_posix(deny, flags); 315 ace->whotype = NFS4_ACL_WHO_GROUP; 316 ace++; 317 acl->naces++; 318 } 319 pa++; 320 321 while (pa->e_tag == ACL_GROUP) { 322 deny = ~(pa->e_perm & pas.mask); 323 deny &= pas.other; 324 if (deny) { 325 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE; 326 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP; 327 ace->access_mask = deny_mask_from_posix(deny, flags); 328 ace->whotype = NFS4_ACL_WHO_NAMED; 329 ace->who = pa->e_id; 330 ace++; 331 acl->naces++; 332 } 333 pa++; 334 } 335 336 if (pa->e_tag == ACL_MASK) 337 pa++; 338 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE; 339 ace->flag = eflag; 340 ace->access_mask = mask_from_posix(pa->e_perm, flags); 341 ace->whotype = NFS4_ACL_WHO_EVERYONE; 342 acl->naces++; 343} 344 345static void 346sort_pacl_range(struct posix_acl *pacl, int start, int end) { 347 int sorted = 0, i; 348 struct posix_acl_entry tmp; 349 350 /* We just do a bubble sort; easy to do in place, and we're not 351 * expecting acl's to be long enough to justify anything more. */ 352 while (!sorted) { 353 sorted = 1; 354 for (i = start; i < end; i++) { 355 if (pacl->a_entries[i].e_id 356 > pacl->a_entries[i+1].e_id) { 357 sorted = 0; 358 tmp = pacl->a_entries[i]; 359 pacl->a_entries[i] = pacl->a_entries[i+1]; 360 pacl->a_entries[i+1] = tmp; 361 } 362 } 363 } 364} 365 366static void 367sort_pacl(struct posix_acl *pacl) 368{ 369 /* posix_acl_valid requires that users and groups be in order 370 * by uid/gid. */ 371 int i, j; 372 373 if (pacl->a_count <= 4) 374 return; /* no users or groups */ 375 i = 1; 376 while (pacl->a_entries[i].e_tag == ACL_USER) 377 i++; 378 sort_pacl_range(pacl, 1, i-1); 379 380 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ); 381 j = ++i; 382 while (pacl->a_entries[j].e_tag == ACL_GROUP) 383 j++; 384 sort_pacl_range(pacl, i, j-1); 385 return; 386} 387 388/* 389 * While processing the NFSv4 ACE, this maintains bitmasks representing 390 * which permission bits have been allowed and which denied to a given 391 * entity: */ 392struct posix_ace_state { 393 u32 allow; 394 u32 deny; 395}; 396 397struct posix_user_ace_state { 398 uid_t uid; 399 struct posix_ace_state perms; 400}; 401 402struct posix_ace_state_array { 403 int n; 404 struct posix_user_ace_state aces[]; 405}; 406 407/* 408 * While processing the NFSv4 ACE, this maintains the partial permissions 409 * calculated so far: */ 410 411struct posix_acl_state { 412 int empty; 413 struct posix_ace_state owner; 414 struct posix_ace_state group; 415 struct posix_ace_state other; 416 struct posix_ace_state everyone; 417 struct posix_ace_state mask; /* Deny unused in this case */ 418 struct posix_ace_state_array *users; 419 struct posix_ace_state_array *groups; 420}; 421 422static int 423init_state(struct posix_acl_state *state, int cnt) 424{ 425 int alloc; 426 427 memset(state, 0, sizeof(struct posix_acl_state)); 428 state->empty = 1; 429 /* 430 * In the worst case, each individual acl could be for a distinct 431 * named user or group, but we don't no which, so we allocate 432 * enough space for either: 433 */ 434 alloc = sizeof(struct posix_ace_state_array) 435 + cnt*sizeof(struct posix_user_ace_state); 436 state->users = kzalloc(alloc, GFP_KERNEL); 437 if (!state->users) 438 return -ENOMEM; 439 state->groups = kzalloc(alloc, GFP_KERNEL); 440 if (!state->groups) { 441 kfree(state->users); 442 return -ENOMEM; 443 } 444 return 0; 445} 446 447static void 448free_state(struct posix_acl_state *state) { 449 kfree(state->users); 450 kfree(state->groups); 451} 452 453static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate) 454{ 455 state->mask.allow |= astate->allow; 456} 457 458/* 459 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS, 460 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate 461 * to traditional read/write/execute permissions. 462 * 463 * It's problematic to reject acls that use certain mode bits, because it 464 * places the burden on users to learn the rules about which bits one 465 * particular server sets, without giving the user a lot of help--we return an 466 * error that could mean any number of different things. To make matters 467 * worse, the problematic bits might be introduced by some application that's 468 * automatically mapping from some other acl model. 469 * 470 * So wherever possible we accept anything, possibly erring on the side of 471 * denying more permissions than necessary. 472 * 473 * However we do reject *explicit* DENY's of a few bits representing 474 * permissions we could never deny: 475 */ 476 477static inline int check_deny(u32 mask, int isowner) 478{ 479 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL)) 480 return -EINVAL; 481 if (!isowner) 482 return 0; 483 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)) 484 return -EINVAL; 485 return 0; 486} 487 488static struct posix_acl * 489posix_state_to_acl(struct posix_acl_state *state, unsigned int flags) 490{ 491 struct posix_acl_entry *pace; 492 struct posix_acl *pacl; 493 int nace; 494 int i, error = 0; 495 496 /* 497 * ACLs with no ACEs are treated differently in the inheritable 498 * and effective cases: when there are no inheritable ACEs, we 499 * set a zero-length default posix acl: 500 */ 501 if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) { 502 pacl = posix_acl_alloc(0, GFP_KERNEL); 503 return pacl ? pacl : ERR_PTR(-ENOMEM); 504 } 505 /* 506 * When there are no effective ACEs, the following will end 507 * up setting a 3-element effective posix ACL with all 508 * permissions zero. 509 */ 510 nace = 4 + state->users->n + state->groups->n; 511 pacl = posix_acl_alloc(nace, GFP_KERNEL); 512 if (!pacl) 513 return ERR_PTR(-ENOMEM); 514 515 pace = pacl->a_entries; 516 pace->e_tag = ACL_USER_OBJ; 517 error = check_deny(state->owner.deny, 1); 518 if (error) 519 goto out_err; 520 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags); 521 pace->e_id = ACL_UNDEFINED_ID; 522 523 for (i=0; i < state->users->n; i++) { 524 pace++; 525 pace->e_tag = ACL_USER; 526 error = check_deny(state->users->aces[i].perms.deny, 0); 527 if (error) 528 goto out_err; 529 low_mode_from_nfs4(state->users->aces[i].perms.allow, 530 &pace->e_perm, flags); 531 pace->e_id = state->users->aces[i].uid; 532 add_to_mask(state, &state->users->aces[i].perms); 533 } 534 535 pace++; 536 pace->e_tag = ACL_GROUP_OBJ; 537 error = check_deny(state->group.deny, 0); 538 if (error) 539 goto out_err; 540 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags); 541 pace->e_id = ACL_UNDEFINED_ID; 542 add_to_mask(state, &state->group); 543 544 for (i=0; i < state->groups->n; i++) { 545 pace++; 546 pace->e_tag = ACL_GROUP; 547 error = check_deny(state->groups->aces[i].perms.deny, 0); 548 if (error) 549 goto out_err; 550 low_mode_from_nfs4(state->groups->aces[i].perms.allow, 551 &pace->e_perm, flags); 552 pace->e_id = state->groups->aces[i].uid; 553 add_to_mask(state, &state->groups->aces[i].perms); 554 } 555 556 pace++; 557 pace->e_tag = ACL_MASK; 558 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags); 559 pace->e_id = ACL_UNDEFINED_ID; 560 561 pace++; 562 pace->e_tag = ACL_OTHER; 563 error = check_deny(state->other.deny, 0); 564 if (error) 565 goto out_err; 566 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags); 567 pace->e_id = ACL_UNDEFINED_ID; 568 569 return pacl; 570out_err: 571 posix_acl_release(pacl); 572 return ERR_PTR(error); 573} 574 575static inline void allow_bits(struct posix_ace_state *astate, u32 mask) 576{ 577 /* Allow all bits in the mask not already denied: */ 578 astate->allow |= mask & ~astate->deny; 579} 580 581static inline void deny_bits(struct posix_ace_state *astate, u32 mask) 582{ 583 /* Deny all bits in the mask not already allowed: */ 584 astate->deny |= mask & ~astate->allow; 585} 586 587static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid) 588{ 589 int i; 590 591 for (i = 0; i < a->n; i++) 592 if (a->aces[i].uid == uid) 593 return i; 594 /* Not found: */ 595 a->n++; 596 a->aces[i].uid = uid; 597 a->aces[i].perms.allow = state->everyone.allow; 598 a->aces[i].perms.deny = state->everyone.deny; 599 600 return i; 601} 602 603static void deny_bits_array(struct posix_ace_state_array *a, u32 mask) 604{ 605 int i; 606 607 for (i=0; i < a->n; i++) 608 deny_bits(&a->aces[i].perms, mask); 609} 610 611static void allow_bits_array(struct posix_ace_state_array *a, u32 mask) 612{ 613 int i; 614 615 for (i=0; i < a->n; i++) 616 allow_bits(&a->aces[i].perms, mask); 617} 618 619static void process_one_v4_ace(struct posix_acl_state *state, 620 struct nfs4_ace *ace) 621{ 622 u32 mask = ace->access_mask; 623 int i; 624 625 state->empty = 0; 626 627 switch (ace2type(ace)) { 628 case ACL_USER_OBJ: 629 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { 630 allow_bits(&state->owner, mask); 631 } else { 632 deny_bits(&state->owner, mask); 633 } 634 break; 635 case ACL_USER: 636 i = find_uid(state, state->users, ace->who); 637 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { 638 allow_bits(&state->users->aces[i].perms, mask); 639 } else { 640 deny_bits(&state->users->aces[i].perms, mask); 641 mask = state->users->aces[i].perms.deny; 642 deny_bits(&state->owner, mask); 643 } 644 break; 645 case ACL_GROUP_OBJ: 646 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { 647 allow_bits(&state->group, mask); 648 } else { 649 deny_bits(&state->group, mask); 650 mask = state->group.deny; 651 deny_bits(&state->owner, mask); 652 deny_bits(&state->everyone, mask); 653 deny_bits_array(state->users, mask); 654 deny_bits_array(state->groups, mask); 655 } 656 break; 657 case ACL_GROUP: 658 i = find_uid(state, state->groups, ace->who); 659 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { 660 allow_bits(&state->groups->aces[i].perms, mask); 661 } else { 662 deny_bits(&state->groups->aces[i].perms, mask); 663 mask = state->groups->aces[i].perms.deny; 664 deny_bits(&state->owner, mask); 665 deny_bits(&state->group, mask); 666 deny_bits(&state->everyone, mask); 667 deny_bits_array(state->users, mask); 668 deny_bits_array(state->groups, mask); 669 } 670 break; 671 case ACL_OTHER: 672 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) { 673 allow_bits(&state->owner, mask); 674 allow_bits(&state->group, mask); 675 allow_bits(&state->other, mask); 676 allow_bits(&state->everyone, mask); 677 allow_bits_array(state->users, mask); 678 allow_bits_array(state->groups, mask); 679 } else { 680 deny_bits(&state->owner, mask); 681 deny_bits(&state->group, mask); 682 deny_bits(&state->other, mask); 683 deny_bits(&state->everyone, mask); 684 deny_bits_array(state->users, mask); 685 deny_bits_array(state->groups, mask); 686 } 687 } 688} 689 690int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl, 691 struct posix_acl **dpacl, unsigned int flags) 692{ 693 struct posix_acl_state effective_acl_state, default_acl_state; 694 struct nfs4_ace *ace; 695 int ret; 696 697 ret = init_state(&effective_acl_state, acl->naces); 698 if (ret) 699 return ret; 700 ret = init_state(&default_acl_state, acl->naces); 701 if (ret) 702 goto out_estate; 703 ret = -EINVAL; 704 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 705 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE && 706 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE) 707 goto out_dstate; 708 if (ace->flag & ~NFS4_SUPPORTED_FLAGS) 709 goto out_dstate; 710 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) { 711 process_one_v4_ace(&effective_acl_state, ace); 712 continue; 713 } 714 if (!(flags & NFS4_ACL_DIR)) 715 goto out_dstate; 716 /* 717 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT 718 * is set, we're effectively turning on the other. That's OK, 719 * according to rfc 3530. 720 */ 721 process_one_v4_ace(&default_acl_state, ace); 722 723 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE)) 724 process_one_v4_ace(&effective_acl_state, ace); 725 } 726 *pacl = posix_state_to_acl(&effective_acl_state, flags); 727 if (IS_ERR(*pacl)) { 728 ret = PTR_ERR(*pacl); 729 *pacl = NULL; 730 goto out_dstate; 731 } 732 *dpacl = posix_state_to_acl(&default_acl_state, 733 flags | NFS4_ACL_TYPE_DEFAULT); 734 if (IS_ERR(*dpacl)) { 735 ret = PTR_ERR(*dpacl); 736 *dpacl = NULL; 737 posix_acl_release(*pacl); 738 *pacl = NULL; 739 goto out_dstate; 740 } 741 sort_pacl(*pacl); 742 sort_pacl(*dpacl); 743 ret = 0; 744out_dstate: 745 free_state(&default_acl_state); 746out_estate: 747 free_state(&effective_acl_state); 748 return ret; 749} 750 751static short 752ace2type(struct nfs4_ace *ace) 753{ 754 switch (ace->whotype) { 755 case NFS4_ACL_WHO_NAMED: 756 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ? 757 ACL_GROUP : ACL_USER); 758 case NFS4_ACL_WHO_OWNER: 759 return ACL_USER_OBJ; 760 case NFS4_ACL_WHO_GROUP: 761 return ACL_GROUP_OBJ; 762 case NFS4_ACL_WHO_EVERYONE: 763 return ACL_OTHER; 764 } 765 BUG(); 766 return -1; 767} 768 769EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4); 770EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix); 771 772struct nfs4_acl * 773nfs4_acl_new(int n) 774{ 775 struct nfs4_acl *acl; 776 777 acl = kmalloc(sizeof(*acl) + n*sizeof(struct nfs4_ace), GFP_KERNEL); 778 if (acl == NULL) 779 return NULL; 780 acl->naces = 0; 781 return acl; 782} 783 784static struct { 785 char *string; 786 int stringlen; 787 int type; 788} s2t_map[] = { 789 { 790 .string = "OWNER@", 791 .stringlen = sizeof("OWNER@") - 1, 792 .type = NFS4_ACL_WHO_OWNER, 793 }, 794 { 795 .string = "GROUP@", 796 .stringlen = sizeof("GROUP@") - 1, 797 .type = NFS4_ACL_WHO_GROUP, 798 }, 799 { 800 .string = "EVERYONE@", 801 .stringlen = sizeof("EVERYONE@") - 1, 802 .type = NFS4_ACL_WHO_EVERYONE, 803 }, 804}; 805 806int 807nfs4_acl_get_whotype(char *p, u32 len) 808{ 809 int i; 810 811 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { 812 if (s2t_map[i].stringlen == len && 813 0 == memcmp(s2t_map[i].string, p, len)) 814 return s2t_map[i].type; 815 } 816 return NFS4_ACL_WHO_NAMED; 817} 818 819int 820nfs4_acl_write_who(int who, char *p) 821{ 822 int i; 823 824 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) { 825 if (s2t_map[i].type == who) { 826 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen); 827 return s2t_map[i].stringlen; 828 } 829 } 830 BUG(); 831 return -1; 832} 833 834EXPORT_SYMBOL(nfs4_acl_new); 835EXPORT_SYMBOL(nfs4_acl_get_whotype); 836EXPORT_SYMBOL(nfs4_acl_write_who); 837