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cifsacl.c
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linux-6.19.14/fs/smb/client/cifsacl.c
1// SPDX-License-Identifier: LGPL-2.1 2/* 3 * 4 * Copyright (C) International Business Machines Corp., 2007,2008 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * 7 * Contains the routines for mapping CIFS/NTFS ACLs 8 * 9 */ 10 11#include <linux/fs.h> 12#include <linux/slab.h> 13#include <linux/string.h> 14#include <linux/keyctl.h> 15#include <linux/key-type.h> 16#include <uapi/linux/posix_acl.h> 17#include <linux/posix_acl.h> 18#include <linux/posix_acl_xattr.h> 19#include <keys/user-type.h> 20#include "cifspdu.h" 21#include "cifsglob.h" 22#include "cifsacl.h" 23#include "cifsproto.h" 24#include "cifs_debug.h" 25#include "fs_context.h" 26#include "cifs_fs_sb.h" 27#include "cifs_unicode.h" 28 29/* security id for everyone/world system group */ 30static const struct smb_sid sid_everyone = { 31 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; 32/* security id for Authenticated Users system group */ 33static const struct smb_sid sid_authusers = { 34 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} }; 35 36/* S-1-22-1 Unmapped Unix users */ 37static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22}, 38 {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 39 40/* S-1-22-2 Unmapped Unix groups */ 41static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22}, 42 {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 43 44/* 45 * See https://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx 46 */ 47 48/* S-1-5-88 MS NFS and Apple style UID/GID/mode */ 49 50/* S-1-5-88-1 Unix uid */ 51static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5}, 52 {cpu_to_le32(88), 53 cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 54 55/* S-1-5-88-2 Unix gid */ 56static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5}, 57 {cpu_to_le32(88), 58 cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 59 60/* S-1-5-88-3 Unix mode */ 61static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5}, 62 {cpu_to_le32(88), 63 cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 64 65static const struct cred *root_cred; 66 67static int 68cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep) 69{ 70 char *payload; 71 72 /* 73 * If the payload is less than or equal to the size of a pointer, then 74 * an allocation here is wasteful. Just copy the data directly to the 75 * payload.value union member instead. 76 * 77 * With this however, you must check the datalen before trying to 78 * dereference payload.data! 79 */ 80 if (prep->datalen <= sizeof(key->payload)) { 81 key->payload.data[0] = NULL; 82 memcpy(&key->payload, prep->data, prep->datalen); 83 } else { 84 payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL); 85 if (!payload) 86 return -ENOMEM; 87 key->payload.data[0] = payload; 88 } 89 90 key->datalen = prep->datalen; 91 return 0; 92} 93 94static inline void 95cifs_idmap_key_destroy(struct key *key) 96{ 97 if (key->datalen > sizeof(key->payload)) 98 kfree(key->payload.data[0]); 99} 100 101static struct key_type cifs_idmap_key_type = { 102 .name = "cifs.idmap", 103 .instantiate = cifs_idmap_key_instantiate, 104 .destroy = cifs_idmap_key_destroy, 105 .describe = user_describe, 106}; 107 108static char * 109sid_to_key_str(struct smb_sid *sidptr, unsigned int type) 110{ 111 int i, len; 112 unsigned int saval; 113 char *sidstr, *strptr; 114 unsigned long long id_auth_val; 115 116 /* 3 bytes for prefix */ 117 sidstr = kmalloc(3 + SID_STRING_BASE_SIZE + 118 (SID_STRING_SUBAUTH_SIZE * sidptr->num_subauth), 119 GFP_KERNEL); 120 if (!sidstr) 121 return sidstr; 122 123 strptr = sidstr; 124 len = sprintf(strptr, "%cs:S-%hhu", type == SIDOWNER ? 'o' : 'g', 125 sidptr->revision); 126 strptr += len; 127 128 /* The authority field is a single 48-bit number */ 129 id_auth_val = (unsigned long long)sidptr->authority[5]; 130 id_auth_val |= (unsigned long long)sidptr->authority[4] << 8; 131 id_auth_val |= (unsigned long long)sidptr->authority[3] << 16; 132 id_auth_val |= (unsigned long long)sidptr->authority[2] << 24; 133 id_auth_val |= (unsigned long long)sidptr->authority[1] << 32; 134 id_auth_val |= (unsigned long long)sidptr->authority[0] << 48; 135 136 /* 137 * MS-DTYP states that if the authority is >= 2^32, then it should be 138 * expressed as a hex value. 139 */ 140 if (id_auth_val <= UINT_MAX) 141 len = sprintf(strptr, "-%llu", id_auth_val); 142 else 143 len = sprintf(strptr, "-0x%llx", id_auth_val); 144 145 strptr += len; 146 147 for (i = 0; i < sidptr->num_subauth; ++i) { 148 saval = le32_to_cpu(sidptr->sub_auth[i]); 149 len = sprintf(strptr, "-%u", saval); 150 strptr += len; 151 } 152 153 return sidstr; 154} 155 156/* 157 * if the two SIDs (roughly equivalent to a UUID for a user or group) are 158 * the same returns zero, if they do not match returns non-zero. 159 */ 160static int 161compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid) 162{ 163 int i; 164 int num_subauth, num_sat, num_saw; 165 166 if ((!ctsid) || (!cwsid)) 167 return 1; 168 169 /* compare the revision */ 170 if (ctsid->revision != cwsid->revision) { 171 if (ctsid->revision > cwsid->revision) 172 return 1; 173 else 174 return -1; 175 } 176 177 /* compare all of the six auth values */ 178 for (i = 0; i < NUM_AUTHS; ++i) { 179 if (ctsid->authority[i] != cwsid->authority[i]) { 180 if (ctsid->authority[i] > cwsid->authority[i]) 181 return 1; 182 else 183 return -1; 184 } 185 } 186 187 /* compare all of the subauth values if any */ 188 num_sat = ctsid->num_subauth; 189 num_saw = cwsid->num_subauth; 190 num_subauth = min(num_sat, num_saw); 191 if (num_subauth) { 192 for (i = 0; i < num_subauth; ++i) { 193 if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { 194 if (le32_to_cpu(ctsid->sub_auth[i]) > 195 le32_to_cpu(cwsid->sub_auth[i])) 196 return 1; 197 else 198 return -1; 199 } 200 } 201 } 202 203 return 0; /* sids compare/match */ 204} 205 206static bool 207is_well_known_sid(const struct smb_sid *psid, uint32_t *puid, bool is_group) 208{ 209 int i; 210 int num_subauth; 211 const struct smb_sid *pwell_known_sid; 212 213 if (!psid || (puid == NULL)) 214 return false; 215 216 num_subauth = psid->num_subauth; 217 218 /* check if Mac (or Windows NFS) vs. Samba format for Unix owner SID */ 219 if (num_subauth == 2) { 220 if (is_group) 221 pwell_known_sid = &sid_unix_groups; 222 else 223 pwell_known_sid = &sid_unix_users; 224 } else if (num_subauth == 3) { 225 if (is_group) 226 pwell_known_sid = &sid_unix_NFS_groups; 227 else 228 pwell_known_sid = &sid_unix_NFS_users; 229 } else 230 return false; 231 232 /* compare the revision */ 233 if (psid->revision != pwell_known_sid->revision) 234 return false; 235 236 /* compare all of the six auth values */ 237 for (i = 0; i < NUM_AUTHS; ++i) { 238 if (psid->authority[i] != pwell_known_sid->authority[i]) { 239 cifs_dbg(FYI, "auth %d did not match\n", i); 240 return false; 241 } 242 } 243 244 if (num_subauth == 2) { 245 if (psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) 246 return false; 247 248 *puid = le32_to_cpu(psid->sub_auth[1]); 249 } else /* 3 subauths, ie Windows/Mac style */ { 250 *puid = le32_to_cpu(psid->sub_auth[0]); 251 if ((psid->sub_auth[0] != pwell_known_sid->sub_auth[0]) || 252 (psid->sub_auth[1] != pwell_known_sid->sub_auth[1])) 253 return false; 254 255 *puid = le32_to_cpu(psid->sub_auth[2]); 256 } 257 258 cifs_dbg(FYI, "Unix UID %d returned from SID\n", *puid); 259 return true; /* well known sid found, uid returned */ 260} 261 262static __u16 263cifs_copy_sid(struct smb_sid *dst, const struct smb_sid *src) 264{ 265 int i; 266 __u16 size = 1 + 1 + 6; 267 268 dst->revision = src->revision; 269 dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); 270 for (i = 0; i < NUM_AUTHS; ++i) 271 dst->authority[i] = src->authority[i]; 272 for (i = 0; i < dst->num_subauth; ++i) 273 dst->sub_auth[i] = src->sub_auth[i]; 274 size += (dst->num_subauth * 4); 275 276 return size; 277} 278 279static int 280id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid) 281{ 282 int rc; 283 struct key *sidkey; 284 struct smb_sid *ksid; 285 unsigned int ksid_size; 286 char desc[3 + 10 + 1]; /* 3 byte prefix + 10 bytes for value + NULL */ 287 const struct cred *saved_cred; 288 289 rc = snprintf(desc, sizeof(desc), "%ci:%u", 290 sidtype == SIDOWNER ? 'o' : 'g', cid); 291 if (rc >= sizeof(desc)) 292 return -EINVAL; 293 294 rc = 0; 295 saved_cred = override_creds(root_cred); 296 sidkey = request_key(&cifs_idmap_key_type, desc, ""); 297 if (IS_ERR(sidkey)) { 298 rc = -EINVAL; 299 cifs_dbg(FYI, "%s: Can't map %cid %u to a SID\n", 300 __func__, sidtype == SIDOWNER ? 'u' : 'g', cid); 301 goto out_revert_creds; 302 } else if (sidkey->datalen < CIFS_SID_BASE_SIZE) { 303 rc = smb_EIO1(smb_eio_trace_malformed_sid_key, sidkey->datalen); 304 cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", 305 __func__, sidkey->datalen); 306 goto invalidate_key; 307 } 308 309 /* 310 * A sid is usually too large to be embedded in payload.value, but if 311 * there are no subauthorities and the host has 8-byte pointers, then 312 * it could be. 313 */ 314 ksid = sidkey->datalen <= sizeof(sidkey->payload) ? 315 (struct smb_sid *)&sidkey->payload : 316 (struct smb_sid *)sidkey->payload.data[0]; 317 318 ksid_size = CIFS_SID_BASE_SIZE + (ksid->num_subauth * sizeof(__le32)); 319 if (ksid_size > sidkey->datalen) { 320 rc = smb_EIO2(smb_eio_trace_malformed_ksid_key, 321 ksid_size, sidkey->datalen); 322 cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu, ksid_size=%u)\n", 323 __func__, sidkey->datalen, ksid_size); 324 goto invalidate_key; 325 } 326 327 cifs_copy_sid(ssid, ksid); 328out_key_put: 329 key_put(sidkey); 330out_revert_creds: 331 revert_creds(saved_cred); 332 return rc; 333 334invalidate_key: 335 key_invalidate(sidkey); 336 goto out_key_put; 337} 338 339int 340sid_to_id(struct cifs_sb_info *cifs_sb, struct smb_sid *psid, 341 struct cifs_fattr *fattr, uint sidtype) 342{ 343 struct key *sidkey; 344 char *sidstr; 345 const struct cred *saved_cred; 346 kuid_t fuid = cifs_sb->ctx->linux_uid; 347 kgid_t fgid = cifs_sb->ctx->linux_gid; 348 349 /* 350 * If we have too many subauthorities, then something is really wrong. 351 * Just return an error. 352 */ 353 if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { 354 cifs_dbg(FYI, "%s: %u subauthorities is too many!\n", 355 __func__, psid->num_subauth); 356 return smb_EIO2(smb_eio_trace_sid_too_many_auth, 357 psid->num_subauth, SID_MAX_SUB_AUTHORITIES); 358 } 359 360 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) || 361 (cifs_sb_master_tcon(cifs_sb)->posix_extensions)) { 362 uint32_t unix_id; 363 bool is_group; 364 365 if (sidtype != SIDOWNER) 366 is_group = true; 367 else 368 is_group = false; 369 370 if (is_well_known_sid(psid, &unix_id, is_group) == false) 371 goto try_upcall_to_get_id; 372 373 if (is_group) { 374 kgid_t gid; 375 gid_t id; 376 377 id = (gid_t)unix_id; 378 gid = make_kgid(&init_user_ns, id); 379 if (gid_valid(gid)) { 380 fgid = gid; 381 goto got_valid_id; 382 } 383 } else { 384 kuid_t uid; 385 uid_t id; 386 387 id = (uid_t)unix_id; 388 uid = make_kuid(&init_user_ns, id); 389 if (uid_valid(uid)) { 390 fuid = uid; 391 goto got_valid_id; 392 } 393 } 394 /* If unable to find uid/gid easily from SID try via upcall */ 395 } 396 397try_upcall_to_get_id: 398 sidstr = sid_to_key_str(psid, sidtype); 399 if (!sidstr) 400 return -ENOMEM; 401 402 saved_cred = override_creds(root_cred); 403 sidkey = request_key(&cifs_idmap_key_type, sidstr, ""); 404 if (IS_ERR(sidkey)) { 405 cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n", 406 __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g'); 407 goto out_revert_creds; 408 } 409 410 /* 411 * FIXME: Here we assume that uid_t and gid_t are same size. It's 412 * probably a safe assumption but might be better to check based on 413 * sidtype. 414 */ 415 BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t)); 416 if (sidkey->datalen != sizeof(uid_t)) { 417 cifs_dbg(FYI, "%s: Downcall contained malformed key (datalen=%hu)\n", 418 __func__, sidkey->datalen); 419 key_invalidate(sidkey); 420 goto out_key_put; 421 } 422 423 if (sidtype == SIDOWNER) { 424 kuid_t uid; 425 uid_t id; 426 memcpy(&id, &sidkey->payload.data[0], sizeof(uid_t)); 427 uid = make_kuid(&init_user_ns, id); 428 if (uid_valid(uid)) 429 fuid = uid; 430 } else { 431 kgid_t gid; 432 gid_t id; 433 memcpy(&id, &sidkey->payload.data[0], sizeof(gid_t)); 434 gid = make_kgid(&init_user_ns, id); 435 if (gid_valid(gid)) 436 fgid = gid; 437 } 438 439out_key_put: 440 key_put(sidkey); 441out_revert_creds: 442 revert_creds(saved_cred); 443 kfree(sidstr); 444 445 /* 446 * Note that we return 0 here unconditionally. If the mapping 447 * fails then we just fall back to using the ctx->linux_uid/linux_gid. 448 */ 449got_valid_id: 450 if (sidtype == SIDOWNER) 451 fattr->cf_uid = fuid; 452 else 453 fattr->cf_gid = fgid; 454 455 return 0; 456} 457 458int 459init_cifs_idmap(void) 460{ 461 struct cred *cred; 462 struct key *keyring; 463 int ret; 464 465 cifs_dbg(FYI, "Registering the %s key type\n", 466 cifs_idmap_key_type.name); 467 468 /* create an override credential set with a special thread keyring in 469 * which requests are cached 470 * 471 * this is used to prevent malicious redirections from being installed 472 * with add_key(). 473 */ 474 cred = prepare_kernel_cred(&init_task); 475 if (!cred) 476 return -ENOMEM; 477 478 keyring = keyring_alloc(".cifs_idmap", 479 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 480 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 481 KEY_USR_VIEW | KEY_USR_READ, 482 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); 483 if (IS_ERR(keyring)) { 484 ret = PTR_ERR(keyring); 485 goto failed_put_cred; 486 } 487 488 ret = register_key_type(&cifs_idmap_key_type); 489 if (ret < 0) 490 goto failed_put_key; 491 492 /* instruct request_key() to use this special keyring as a cache for 493 * the results it looks up */ 494 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); 495 cred->thread_keyring = keyring; 496 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; 497 root_cred = cred; 498 499 cifs_dbg(FYI, "cifs idmap keyring: %d\n", key_serial(keyring)); 500 return 0; 501 502failed_put_key: 503 key_put(keyring); 504failed_put_cred: 505 put_cred(cred); 506 return ret; 507} 508 509void 510exit_cifs_idmap(void) 511{ 512 key_revoke(root_cred->thread_keyring); 513 unregister_key_type(&cifs_idmap_key_type); 514 put_cred(root_cred); 515 cifs_dbg(FYI, "Unregistered %s key type\n", cifs_idmap_key_type.name); 516} 517 518/* copy ntsd, owner sid, and group sid from a security descriptor to another */ 519static __u32 copy_sec_desc(const struct smb_ntsd *pntsd, 520 struct smb_ntsd *pnntsd, 521 __u32 sidsoffset, 522 struct smb_sid *pownersid, 523 struct smb_sid *pgrpsid) 524{ 525 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 526 struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr; 527 528 /* copy security descriptor control portion */ 529 pnntsd->revision = pntsd->revision; 530 pnntsd->type = pntsd->type; 531 pnntsd->dacloffset = cpu_to_le32(sizeof(struct smb_ntsd)); 532 pnntsd->sacloffset = 0; 533 pnntsd->osidoffset = cpu_to_le32(sidsoffset); 534 pnntsd->gsidoffset = cpu_to_le32(sidsoffset + sizeof(struct smb_sid)); 535 536 /* copy owner sid */ 537 if (pownersid) 538 owner_sid_ptr = pownersid; 539 else 540 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + 541 le32_to_cpu(pntsd->osidoffset)); 542 nowner_sid_ptr = (struct smb_sid *)((char *)pnntsd + sidsoffset); 543 cifs_copy_sid(nowner_sid_ptr, owner_sid_ptr); 544 545 /* copy group sid */ 546 if (pgrpsid) 547 group_sid_ptr = pgrpsid; 548 else 549 group_sid_ptr = (struct smb_sid *)((char *)pntsd + 550 le32_to_cpu(pntsd->gsidoffset)); 551 ngroup_sid_ptr = (struct smb_sid *)((char *)pnntsd + sidsoffset + 552 sizeof(struct smb_sid)); 553 cifs_copy_sid(ngroup_sid_ptr, group_sid_ptr); 554 555 return sidsoffset + (2 * sizeof(struct smb_sid)); 556} 557 558 559/* 560 change posix mode to reflect permissions 561 pmode is the existing mode (we only want to overwrite part of this 562 bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 563*/ 564static void access_flags_to_mode(__le32 ace_flags, int type, umode_t *pmode, 565 umode_t *pdenied, umode_t mask) 566{ 567 __u32 flags = le32_to_cpu(ace_flags); 568 /* 569 * Do not assume "preferred" or "canonical" order. 570 * The first DENY or ALLOW ACE which matches perfectly is 571 * the permission to be used. Once allowed or denied, same 572 * permission in later ACEs do not matter. 573 */ 574 575 /* If not already allowed, deny these bits */ 576 if (type == ACCESS_DENIED) { 577 if (flags & GENERIC_ALL && 578 !(*pmode & mask & 0777)) 579 *pdenied |= mask & 0777; 580 581 if (((flags & GENERIC_WRITE) || 582 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) && 583 !(*pmode & mask & 0222)) 584 *pdenied |= mask & 0222; 585 586 if (((flags & GENERIC_READ) || 587 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) && 588 !(*pmode & mask & 0444)) 589 *pdenied |= mask & 0444; 590 591 if (((flags & GENERIC_EXECUTE) || 592 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) && 593 !(*pmode & mask & 0111)) 594 *pdenied |= mask & 0111; 595 596 return; 597 } else if (type != ACCESS_ALLOWED) { 598 cifs_dbg(VFS, "unknown access control type %d\n", type); 599 return; 600 } 601 /* else ACCESS_ALLOWED type */ 602 603 if ((flags & GENERIC_ALL) && 604 !(*pdenied & mask & 0777)) { 605 *pmode |= mask & 0777; 606 cifs_dbg(NOISY, "all perms\n"); 607 return; 608 } 609 610 if (((flags & GENERIC_WRITE) || 611 ((flags & FILE_WRITE_RIGHTS) == FILE_WRITE_RIGHTS)) && 612 !(*pdenied & mask & 0222)) 613 *pmode |= mask & 0222; 614 615 if (((flags & GENERIC_READ) || 616 ((flags & FILE_READ_RIGHTS) == FILE_READ_RIGHTS)) && 617 !(*pdenied & mask & 0444)) 618 *pmode |= mask & 0444; 619 620 if (((flags & GENERIC_EXECUTE) || 621 ((flags & FILE_EXEC_RIGHTS) == FILE_EXEC_RIGHTS)) && 622 !(*pdenied & mask & 0111)) 623 *pmode |= mask & 0111; 624 625 /* If DELETE_CHILD is set only on an owner ACE, set sticky bit */ 626 if (flags & FILE_DELETE_CHILD) { 627 if (mask == ACL_OWNER_MASK) { 628 if (!(*pdenied & 01000)) 629 *pmode |= 01000; 630 } else if (!(*pdenied & 01000)) { 631 *pmode &= ~01000; 632 *pdenied |= 01000; 633 } 634 } 635 636 cifs_dbg(NOISY, "access flags 0x%x mode now %04o\n", flags, *pmode); 637 return; 638} 639 640/* 641 Generate access flags to reflect permissions mode is the existing mode. 642 This function is called for every ACE in the DACL whose SID matches 643 with either owner or group or everyone. 644*/ 645 646static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, 647 __u32 *pace_flags) 648{ 649 /* reset access mask */ 650 *pace_flags = 0x0; 651 652 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ 653 mode &= bits_to_use; 654 655 /* check for R/W/X UGO since we do not know whose flags 656 is this but we have cleared all the bits sans RWX for 657 either user or group or other as per bits_to_use */ 658 if (mode & S_IRUGO) 659 *pace_flags |= SET_FILE_READ_RIGHTS; 660 if (mode & S_IWUGO) 661 *pace_flags |= SET_FILE_WRITE_RIGHTS; 662 if (mode & S_IXUGO) 663 *pace_flags |= SET_FILE_EXEC_RIGHTS; 664 665 cifs_dbg(NOISY, "mode: %04o, access flags now 0x%x\n", 666 mode, *pace_flags); 667 return; 668} 669 670static __u16 cifs_copy_ace(struct smb_ace *dst, struct smb_ace *src, struct smb_sid *psid) 671{ 672 __u16 size = 1 + 1 + 2 + 4; 673 674 dst->type = src->type; 675 dst->flags = src->flags; 676 dst->access_req = src->access_req; 677 678 /* Check if there's a replacement sid specified */ 679 if (psid) 680 size += cifs_copy_sid(&dst->sid, psid); 681 else 682 size += cifs_copy_sid(&dst->sid, &src->sid); 683 684 dst->size = cpu_to_le16(size); 685 686 return size; 687} 688 689static __u16 fill_ace_for_sid(struct smb_ace *pntace, 690 const struct smb_sid *psid, __u64 nmode, 691 umode_t bits, __u8 access_type, 692 bool allow_delete_child) 693{ 694 int i; 695 __u16 size = 0; 696 __u32 access_req = 0; 697 698 pntace->type = access_type; 699 pntace->flags = 0x0; 700 mode_to_access_flags(nmode, bits, &access_req); 701 702 if (access_type == ACCESS_ALLOWED && allow_delete_child) 703 access_req |= FILE_DELETE_CHILD; 704 705 if (access_type == ACCESS_ALLOWED && !access_req) 706 access_req = SET_MINIMUM_RIGHTS; 707 else if (access_type == ACCESS_DENIED) 708 access_req &= ~SET_MINIMUM_RIGHTS; 709 710 pntace->access_req = cpu_to_le32(access_req); 711 712 pntace->sid.revision = psid->revision; 713 pntace->sid.num_subauth = psid->num_subauth; 714 for (i = 0; i < NUM_AUTHS; i++) 715 pntace->sid.authority[i] = psid->authority[i]; 716 for (i = 0; i < psid->num_subauth; i++) 717 pntace->sid.sub_auth[i] = psid->sub_auth[i]; 718 719 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); 720 pntace->size = cpu_to_le16(size); 721 722 return size; 723} 724 725 726#ifdef CONFIG_CIFS_DEBUG2 727static void dump_ace(struct smb_ace *pace, char *end_of_acl) 728{ 729 int num_subauth; 730 731 /* validate that we do not go past end of acl */ 732 733 if (le16_to_cpu(pace->size) < 16) { 734 cifs_dbg(VFS, "ACE too small %d\n", le16_to_cpu(pace->size)); 735 return; 736 } 737 738 if (end_of_acl < (char *)pace + le16_to_cpu(pace->size)) { 739 cifs_dbg(VFS, "ACL too small to parse ACE\n"); 740 return; 741 } 742 743 num_subauth = pace->sid.num_subauth; 744 if (num_subauth) { 745 int i; 746 cifs_dbg(FYI, "ACE revision %d num_auth %d type %d flags %d size %d\n", 747 pace->sid.revision, pace->sid.num_subauth, pace->type, 748 pace->flags, le16_to_cpu(pace->size)); 749 for (i = 0; i < num_subauth; ++i) { 750 cifs_dbg(FYI, "ACE sub_auth[%d]: 0x%x\n", 751 i, le32_to_cpu(pace->sid.sub_auth[i])); 752 } 753 754 /* BB add length check to make sure that we do not have huge 755 num auths and therefore go off the end */ 756 } 757 758 return; 759} 760#endif 761 762static void parse_dacl(struct smb_acl *pdacl, char *end_of_acl, 763 struct smb_sid *pownersid, struct smb_sid *pgrpsid, 764 struct cifs_fattr *fattr, bool mode_from_special_sid) 765{ 766 int i; 767 u16 num_aces = 0; 768 int acl_size; 769 char *acl_base; 770 struct smb_ace **ppace; 771 772 /* BB need to add parm so we can store the SID BB */ 773 774 if (!pdacl) { 775 /* no DACL in the security descriptor, set 776 all the permissions for user/group/other */ 777 fattr->cf_mode |= 0777; 778 return; 779 } 780 781 /* validate that we do not go past end of acl */ 782 if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) || 783 end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { 784 cifs_dbg(VFS, "ACL too small to parse DACL\n"); 785 return; 786 } 787 788 cifs_dbg(NOISY, "DACL revision %d size %d num aces %d\n", 789 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), 790 le16_to_cpu(pdacl->num_aces)); 791 792 /* reset rwx permissions for user/group/other. 793 Also, if num_aces is 0 i.e. DACL has no ACEs, 794 user/group/other have no permissions */ 795 fattr->cf_mode &= ~(0777); 796 797 acl_base = (char *)pdacl; 798 acl_size = sizeof(struct smb_acl); 799 800 num_aces = le16_to_cpu(pdacl->num_aces); 801 if (num_aces > 0) { 802 umode_t denied_mode = 0; 803 804 if (num_aces > (le16_to_cpu(pdacl->size) - sizeof(struct smb_acl)) / 805 (offsetof(struct smb_ace, sid) + 806 offsetof(struct smb_sid, sub_auth) + sizeof(__le16))) 807 return; 808 809 ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), 810 GFP_KERNEL); 811 if (!ppace) 812 return; 813 814 for (i = 0; i < num_aces; ++i) { 815 if (end_of_acl - acl_base < acl_size) 816 break; 817 818 ppace[i] = (struct smb_ace *) (acl_base + acl_size); 819 acl_base = (char *)ppace[i]; 820 acl_size = offsetof(struct smb_ace, sid) + 821 offsetof(struct smb_sid, sub_auth); 822 823 if (end_of_acl - acl_base < acl_size || 824 ppace[i]->sid.num_subauth == 0 || 825 ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES || 826 (end_of_acl - acl_base < 827 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) || 828 (le16_to_cpu(ppace[i]->size) < 829 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth)) 830 break; 831 832#ifdef CONFIG_CIFS_DEBUG2 833 dump_ace(ppace[i], end_of_acl); 834#endif 835 if (mode_from_special_sid && 836 (compare_sids(&(ppace[i]->sid), 837 &sid_unix_NFS_mode) == 0)) { 838 /* 839 * Full permissions are: 840 * 07777 = S_ISUID | S_ISGID | S_ISVTX | 841 * S_IRWXU | S_IRWXG | S_IRWXO 842 */ 843 fattr->cf_mode &= ~07777; 844 fattr->cf_mode |= 845 le32_to_cpu(ppace[i]->sid.sub_auth[2]); 846 break; 847 } else { 848 if (compare_sids(&(ppace[i]->sid), pownersid) == 0) { 849 access_flags_to_mode(ppace[i]->access_req, 850 ppace[i]->type, 851 &fattr->cf_mode, 852 &denied_mode, 853 ACL_OWNER_MASK); 854 } else if (compare_sids(&(ppace[i]->sid), pgrpsid) == 0) { 855 access_flags_to_mode(ppace[i]->access_req, 856 ppace[i]->type, 857 &fattr->cf_mode, 858 &denied_mode, 859 ACL_GROUP_MASK); 860 } else if ((compare_sids(&(ppace[i]->sid), &sid_everyone) == 0) || 861 (compare_sids(&(ppace[i]->sid), &sid_authusers) == 0)) { 862 access_flags_to_mode(ppace[i]->access_req, 863 ppace[i]->type, 864 &fattr->cf_mode, 865 &denied_mode, 866 ACL_EVERYONE_MASK); 867 } 868 } 869 870 871/* memcpy((void *)(&(cifscred->aces[i])), 872 (void *)ppace[i], 873 sizeof(struct smb_ace)); */ 874 875 acl_size = le16_to_cpu(ppace[i]->size); 876 } 877 878 kfree(ppace); 879 } 880 881 return; 882} 883 884unsigned int setup_authusers_ACE(struct smb_ace *pntace) 885{ 886 int i; 887 unsigned int ace_size = 20; 888 889 pntace->type = ACCESS_ALLOWED_ACE_TYPE; 890 pntace->flags = 0x0; 891 pntace->access_req = cpu_to_le32(GENERIC_ALL); 892 pntace->sid.num_subauth = 1; 893 pntace->sid.revision = 1; 894 for (i = 0; i < NUM_AUTHS; i++) 895 pntace->sid.authority[i] = sid_authusers.authority[i]; 896 897 pntace->sid.sub_auth[0] = sid_authusers.sub_auth[0]; 898 899 /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ 900 pntace->size = cpu_to_le16(ace_size); 901 return ace_size; 902} 903 904/* 905 * Fill in the special SID based on the mode. See 906 * https://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx 907 */ 908unsigned int setup_special_mode_ACE(struct smb_ace *pntace, 909 bool posix, 910 __u64 nmode) 911{ 912 int i; 913 unsigned int ace_size = 28; 914 915 if (posix) 916 pntace->type = ACCESS_ALLOWED_ACE_TYPE; 917 else 918 pntace->type = ACCESS_DENIED_ACE_TYPE; 919 pntace->flags = 0x0; 920 pntace->access_req = 0; 921 pntace->sid.num_subauth = 3; 922 pntace->sid.revision = 1; 923 for (i = 0; i < NUM_AUTHS; i++) 924 pntace->sid.authority[i] = sid_unix_NFS_mode.authority[i]; 925 926 pntace->sid.sub_auth[0] = sid_unix_NFS_mode.sub_auth[0]; 927 pntace->sid.sub_auth[1] = sid_unix_NFS_mode.sub_auth[1]; 928 pntace->sid.sub_auth[2] = cpu_to_le32(nmode & 07777); 929 930 /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ 931 pntace->size = cpu_to_le16(ace_size); 932 return ace_size; 933} 934 935unsigned int setup_special_user_owner_ACE(struct smb_ace *pntace) 936{ 937 int i; 938 unsigned int ace_size = 28; 939 940 pntace->type = ACCESS_ALLOWED_ACE_TYPE; 941 pntace->flags = 0x0; 942 pntace->access_req = cpu_to_le32(GENERIC_ALL); 943 pntace->sid.num_subauth = 3; 944 pntace->sid.revision = 1; 945 for (i = 0; i < NUM_AUTHS; i++) 946 pntace->sid.authority[i] = sid_unix_NFS_users.authority[i]; 947 948 pntace->sid.sub_auth[0] = sid_unix_NFS_users.sub_auth[0]; 949 pntace->sid.sub_auth[1] = sid_unix_NFS_users.sub_auth[1]; 950 pntace->sid.sub_auth[2] = cpu_to_le32(current_fsgid().val); 951 952 /* size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth*4) */ 953 pntace->size = cpu_to_le16(ace_size); 954 return ace_size; 955} 956 957static void populate_new_aces(char *nacl_base, 958 struct smb_sid *pownersid, 959 struct smb_sid *pgrpsid, 960 __u64 *pnmode, u16 *pnum_aces, u16 *pnsize, 961 bool modefromsid, 962 bool posix) 963{ 964 __u64 nmode; 965 u16 num_aces = 0; 966 u16 nsize = 0; 967 __u64 user_mode; 968 __u64 group_mode; 969 __u64 other_mode; 970 __u64 deny_user_mode = 0; 971 __u64 deny_group_mode = 0; 972 bool sticky_set = false; 973 struct smb_ace *pnntace = NULL; 974 975 nmode = *pnmode; 976 num_aces = *pnum_aces; 977 nsize = *pnsize; 978 979 if (modefromsid || posix) { 980 pnntace = (struct smb_ace *) (nacl_base + nsize); 981 nsize += setup_special_mode_ACE(pnntace, posix, nmode); 982 num_aces++; 983 if (modefromsid) { 984 pnntace = (struct smb_ace *) (nacl_base + nsize); 985 nsize += setup_authusers_ACE(pnntace); 986 num_aces++; 987 } 988 goto set_size; 989 } 990 991 /* 992 * We'll try to keep the mode as requested by the user. 993 * But in cases where we cannot meaningfully convert that 994 * into ACL, return back the updated mode, so that it is 995 * updated in the inode. 996 */ 997 998 if (!memcmp(pownersid, pgrpsid, sizeof(struct smb_sid))) { 999 /* 1000 * Case when owner and group SIDs are the same. 1001 * Set the more restrictive of the two modes. 1002 */ 1003 user_mode = nmode & (nmode << 3) & 0700; 1004 group_mode = nmode & (nmode >> 3) & 0070; 1005 } else { 1006 user_mode = nmode & 0700; 1007 group_mode = nmode & 0070; 1008 } 1009 1010 other_mode = nmode & 0007; 1011 1012 /* We need DENY ACE when the perm is more restrictive than the next sets. */ 1013 deny_user_mode = ~(user_mode) & ((group_mode << 3) | (other_mode << 6)) & 0700; 1014 deny_group_mode = ~(group_mode) & (other_mode << 3) & 0070; 1015 1016 *pnmode = user_mode | group_mode | other_mode | (nmode & ~0777); 1017 1018 /* This tells if we should allow delete child for group and everyone. */ 1019 if (nmode & 01000) 1020 sticky_set = true; 1021 1022 if (deny_user_mode) { 1023 pnntace = (struct smb_ace *) (nacl_base + nsize); 1024 nsize += fill_ace_for_sid(pnntace, pownersid, deny_user_mode, 1025 0700, ACCESS_DENIED, false); 1026 num_aces++; 1027 } 1028 1029 /* Group DENY ACE does not conflict with owner ALLOW ACE. Keep in preferred order*/ 1030 if (deny_group_mode && !(deny_group_mode & (user_mode >> 3))) { 1031 pnntace = (struct smb_ace *) (nacl_base + nsize); 1032 nsize += fill_ace_for_sid(pnntace, pgrpsid, deny_group_mode, 1033 0070, ACCESS_DENIED, false); 1034 num_aces++; 1035 } 1036 1037 pnntace = (struct smb_ace *) (nacl_base + nsize); 1038 nsize += fill_ace_for_sid(pnntace, pownersid, user_mode, 1039 0700, ACCESS_ALLOWED, true); 1040 num_aces++; 1041 1042 /* Group DENY ACE conflicts with owner ALLOW ACE. So keep it after. */ 1043 if (deny_group_mode && (deny_group_mode & (user_mode >> 3))) { 1044 pnntace = (struct smb_ace *) (nacl_base + nsize); 1045 nsize += fill_ace_for_sid(pnntace, pgrpsid, deny_group_mode, 1046 0070, ACCESS_DENIED, false); 1047 num_aces++; 1048 } 1049 1050 pnntace = (struct smb_ace *) (nacl_base + nsize); 1051 nsize += fill_ace_for_sid(pnntace, pgrpsid, group_mode, 1052 0070, ACCESS_ALLOWED, !sticky_set); 1053 num_aces++; 1054 1055 pnntace = (struct smb_ace *) (nacl_base + nsize); 1056 nsize += fill_ace_for_sid(pnntace, &sid_everyone, other_mode, 1057 0007, ACCESS_ALLOWED, !sticky_set); 1058 num_aces++; 1059 1060set_size: 1061 *pnum_aces = num_aces; 1062 *pnsize = nsize; 1063} 1064 1065static __u16 replace_sids_and_copy_aces(struct smb_acl *pdacl, struct smb_acl *pndacl, 1066 struct smb_sid *pownersid, struct smb_sid *pgrpsid, 1067 struct smb_sid *pnownersid, struct smb_sid *pngrpsid) 1068{ 1069 int i; 1070 u16 size = 0; 1071 struct smb_ace *pntace = NULL; 1072 char *acl_base = NULL; 1073 u16 src_num_aces = 0; 1074 u16 nsize = 0; 1075 struct smb_ace *pnntace = NULL; 1076 char *nacl_base = NULL; 1077 u16 ace_size = 0; 1078 1079 acl_base = (char *)pdacl; 1080 size = sizeof(struct smb_acl); 1081 src_num_aces = le16_to_cpu(pdacl->num_aces); 1082 1083 nacl_base = (char *)pndacl; 1084 nsize = sizeof(struct smb_acl); 1085 1086 /* Go through all the ACEs */ 1087 for (i = 0; i < src_num_aces; ++i) { 1088 pntace = (struct smb_ace *) (acl_base + size); 1089 pnntace = (struct smb_ace *) (nacl_base + nsize); 1090 1091 if (pnownersid && compare_sids(&pntace->sid, pownersid) == 0) 1092 ace_size = cifs_copy_ace(pnntace, pntace, pnownersid); 1093 else if (pngrpsid && compare_sids(&pntace->sid, pgrpsid) == 0) 1094 ace_size = cifs_copy_ace(pnntace, pntace, pngrpsid); 1095 else 1096 ace_size = cifs_copy_ace(pnntace, pntace, NULL); 1097 1098 size += le16_to_cpu(pntace->size); 1099 nsize += ace_size; 1100 } 1101 1102 return nsize; 1103} 1104 1105static int set_chmod_dacl(struct smb_acl *pdacl, struct smb_acl *pndacl, 1106 struct smb_sid *pownersid, struct smb_sid *pgrpsid, 1107 __u64 *pnmode, bool mode_from_sid, bool posix) 1108{ 1109 int i; 1110 u16 size = 0; 1111 struct smb_ace *pntace = NULL; 1112 char *acl_base = NULL; 1113 u16 src_num_aces = 0; 1114 u16 nsize = 0; 1115 struct smb_ace *pnntace = NULL; 1116 char *nacl_base = NULL; 1117 u16 num_aces = 0; 1118 bool new_aces_set = false; 1119 1120 /* Assuming that pndacl and pnmode are never NULL */ 1121 nacl_base = (char *)pndacl; 1122 nsize = sizeof(struct smb_acl); 1123 1124 /* If pdacl is NULL, we don't have a src. Simply populate new ACL. */ 1125 if (!pdacl || posix) { 1126 populate_new_aces(nacl_base, 1127 pownersid, pgrpsid, 1128 pnmode, &num_aces, &nsize, 1129 mode_from_sid, posix); 1130 goto finalize_dacl; 1131 } 1132 1133 acl_base = (char *)pdacl; 1134 size = sizeof(struct smb_acl); 1135 src_num_aces = le16_to_cpu(pdacl->num_aces); 1136 1137 /* Retain old ACEs which we can retain */ 1138 for (i = 0; i < src_num_aces; ++i) { 1139 pntace = (struct smb_ace *) (acl_base + size); 1140 1141 if (!new_aces_set && (pntace->flags & INHERITED_ACE)) { 1142 /* Place the new ACEs in between existing explicit and inherited */ 1143 populate_new_aces(nacl_base, 1144 pownersid, pgrpsid, 1145 pnmode, &num_aces, &nsize, 1146 mode_from_sid, posix); 1147 1148 new_aces_set = true; 1149 } 1150 1151 /* If it's any one of the ACE we're replacing, skip! */ 1152 if (((compare_sids(&pntace->sid, &sid_unix_NFS_mode) == 0) || 1153 (compare_sids(&pntace->sid, pownersid) == 0) || 1154 (compare_sids(&pntace->sid, pgrpsid) == 0) || 1155 (compare_sids(&pntace->sid, &sid_everyone) == 0) || 1156 (compare_sids(&pntace->sid, &sid_authusers) == 0))) { 1157 goto next_ace; 1158 } 1159 1160 /* update the pointer to the next ACE to populate*/ 1161 pnntace = (struct smb_ace *) (nacl_base + nsize); 1162 1163 nsize += cifs_copy_ace(pnntace, pntace, NULL); 1164 num_aces++; 1165 1166next_ace: 1167 size += le16_to_cpu(pntace->size); 1168 } 1169 1170 /* If inherited ACEs are not present, place the new ones at the tail */ 1171 if (!new_aces_set) { 1172 populate_new_aces(nacl_base, 1173 pownersid, pgrpsid, 1174 pnmode, &num_aces, &nsize, 1175 mode_from_sid, posix); 1176 1177 new_aces_set = true; 1178 } 1179 1180finalize_dacl: 1181 pndacl->num_aces = cpu_to_le16(num_aces); 1182 pndacl->size = cpu_to_le16(nsize); 1183 1184 return 0; 1185} 1186 1187static int parse_sid(struct smb_sid *psid, char *end_of_acl) 1188{ 1189 /* BB need to add parm so we can store the SID BB */ 1190 1191 /* validate that we do not go past end of ACL - sid must be at least 8 1192 bytes long (assuming no sub-auths - e.g. the null SID */ 1193 if (end_of_acl < (char *)psid + 8) { 1194 cifs_dbg(VFS, "ACL too small to parse SID %p\n", psid); 1195 return -EINVAL; 1196 } 1197 1198#ifdef CONFIG_CIFS_DEBUG2 1199 if (psid->num_subauth) { 1200 int i; 1201 cifs_dbg(FYI, "SID revision %d num_auth %d\n", 1202 psid->revision, psid->num_subauth); 1203 1204 for (i = 0; i < psid->num_subauth; i++) { 1205 cifs_dbg(FYI, "SID sub_auth[%d]: 0x%x\n", 1206 i, le32_to_cpu(psid->sub_auth[i])); 1207 } 1208 1209 /* BB add length check to make sure that we do not have huge 1210 num auths and therefore go off the end */ 1211 cifs_dbg(FYI, "RID 0x%x\n", 1212 le32_to_cpu(psid->sub_auth[psid->num_subauth-1])); 1213 } 1214#endif 1215 1216 return 0; 1217} 1218 1219 1220/* Convert CIFS ACL to POSIX form */ 1221static int parse_sec_desc(struct cifs_sb_info *cifs_sb, 1222 struct smb_ntsd *pntsd, int acl_len, struct cifs_fattr *fattr, 1223 bool get_mode_from_special_sid) 1224{ 1225 int rc = 0; 1226 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 1227 struct smb_acl *dacl_ptr; /* no need for SACL ptr */ 1228 char *end_of_acl = ((char *)pntsd) + acl_len; 1229 __u32 dacloffset; 1230 1231 if (pntsd == NULL) 1232 return smb_EIO(smb_eio_trace_null_pointers); 1233 1234 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + 1235 le32_to_cpu(pntsd->osidoffset)); 1236 group_sid_ptr = (struct smb_sid *)((char *)pntsd + 1237 le32_to_cpu(pntsd->gsidoffset)); 1238 dacloffset = le32_to_cpu(pntsd->dacloffset); 1239 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset); 1240 cifs_dbg(NOISY, "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", 1241 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), 1242 le32_to_cpu(pntsd->gsidoffset), 1243 le32_to_cpu(pntsd->sacloffset), dacloffset); 1244/* cifs_dump_mem("owner_sid: ", owner_sid_ptr, 64); */ 1245 rc = parse_sid(owner_sid_ptr, end_of_acl); 1246 if (rc) { 1247 cifs_dbg(FYI, "%s: Error %d parsing Owner SID\n", __func__, rc); 1248 return rc; 1249 } 1250 rc = sid_to_id(cifs_sb, owner_sid_ptr, fattr, SIDOWNER); 1251 if (rc) { 1252 cifs_dbg(FYI, "%s: Error %d mapping Owner SID to uid\n", 1253 __func__, rc); 1254 return rc; 1255 } 1256 1257 rc = parse_sid(group_sid_ptr, end_of_acl); 1258 if (rc) { 1259 cifs_dbg(FYI, "%s: Error %d mapping Owner SID to gid\n", 1260 __func__, rc); 1261 return rc; 1262 } 1263 rc = sid_to_id(cifs_sb, group_sid_ptr, fattr, SIDGROUP); 1264 if (rc) { 1265 cifs_dbg(FYI, "%s: Error %d mapping Group SID to gid\n", 1266 __func__, rc); 1267 return rc; 1268 } 1269 1270 if (dacloffset) 1271 parse_dacl(dacl_ptr, end_of_acl, owner_sid_ptr, 1272 group_sid_ptr, fattr, get_mode_from_special_sid); 1273 else 1274 cifs_dbg(FYI, "no ACL\n"); /* BB grant all or default perms? */ 1275 1276 return rc; 1277} 1278 1279/* Convert permission bits from mode to equivalent CIFS ACL */ 1280static int build_sec_desc(struct smb_ntsd *pntsd, struct smb_ntsd *pnntsd, 1281 __u32 secdesclen, __u32 *pnsecdesclen, __u64 *pnmode, kuid_t uid, kgid_t gid, 1282 bool mode_from_sid, bool id_from_sid, bool posix, int *aclflag) 1283{ 1284 int rc = 0; 1285 __u32 dacloffset; 1286 __u32 ndacloffset; 1287 __u32 sidsoffset; 1288 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 1289 struct smb_sid *nowner_sid_ptr = NULL, *ngroup_sid_ptr = NULL; 1290 struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */ 1291 struct smb_acl *ndacl_ptr = NULL; /* no need for SACL ptr */ 1292 char *end_of_acl = ((char *)pntsd) + secdesclen; 1293 u16 size = 0; 1294 1295 dacloffset = le32_to_cpu(pntsd->dacloffset); 1296 if (dacloffset) { 1297 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset); 1298 if (end_of_acl < (char *)dacl_ptr + le16_to_cpu(dacl_ptr->size)) { 1299 cifs_dbg(VFS, "Server returned illegal ACL size\n"); 1300 return -EINVAL; 1301 } 1302 } 1303 1304 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + 1305 le32_to_cpu(pntsd->osidoffset)); 1306 group_sid_ptr = (struct smb_sid *)((char *)pntsd + 1307 le32_to_cpu(pntsd->gsidoffset)); 1308 1309 if (pnmode && *pnmode != NO_CHANGE_64) { /* chmod */ 1310 ndacloffset = sizeof(struct smb_ntsd); 1311 ndacl_ptr = (struct smb_acl *)((char *)pnntsd + ndacloffset); 1312 ndacl_ptr->revision = 1313 dacloffset ? dacl_ptr->revision : cpu_to_le16(ACL_REVISION); 1314 1315 ndacl_ptr->size = cpu_to_le16(0); 1316 ndacl_ptr->num_aces = cpu_to_le16(0); 1317 1318 rc = set_chmod_dacl(dacl_ptr, ndacl_ptr, owner_sid_ptr, group_sid_ptr, 1319 pnmode, mode_from_sid, posix); 1320 1321 sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); 1322 /* copy the non-dacl portion of secdesc */ 1323 *pnsecdesclen = copy_sec_desc(pntsd, pnntsd, sidsoffset, 1324 NULL, NULL); 1325 1326 *aclflag |= CIFS_ACL_DACL; 1327 } else { 1328 ndacloffset = sizeof(struct smb_ntsd); 1329 ndacl_ptr = (struct smb_acl *)((char *)pnntsd + ndacloffset); 1330 ndacl_ptr->revision = 1331 dacloffset ? dacl_ptr->revision : cpu_to_le16(ACL_REVISION); 1332 ndacl_ptr->num_aces = dacl_ptr ? dacl_ptr->num_aces : 0; 1333 1334 if (uid_valid(uid)) { /* chown */ 1335 uid_t id; 1336 nowner_sid_ptr = kzalloc(sizeof(struct smb_sid), 1337 GFP_KERNEL); 1338 if (!nowner_sid_ptr) { 1339 rc = -ENOMEM; 1340 goto chown_chgrp_exit; 1341 } 1342 id = from_kuid(&init_user_ns, uid); 1343 if (id_from_sid) { 1344 struct owner_sid *osid = (struct owner_sid *)nowner_sid_ptr; 1345 /* Populate the user ownership fields S-1-5-88-1 */ 1346 osid->Revision = 1; 1347 osid->NumAuth = 3; 1348 osid->Authority[5] = 5; 1349 osid->SubAuthorities[0] = cpu_to_le32(88); 1350 osid->SubAuthorities[1] = cpu_to_le32(1); 1351 osid->SubAuthorities[2] = cpu_to_le32(id); 1352 1353 } else { /* lookup sid with upcall */ 1354 rc = id_to_sid(id, SIDOWNER, nowner_sid_ptr); 1355 if (rc) { 1356 cifs_dbg(FYI, "%s: Mapping error %d for owner id %d\n", 1357 __func__, rc, id); 1358 goto chown_chgrp_exit; 1359 } 1360 } 1361 *aclflag |= CIFS_ACL_OWNER; 1362 } 1363 if (gid_valid(gid)) { /* chgrp */ 1364 gid_t id; 1365 ngroup_sid_ptr = kzalloc(sizeof(struct smb_sid), 1366 GFP_KERNEL); 1367 if (!ngroup_sid_ptr) { 1368 rc = -ENOMEM; 1369 goto chown_chgrp_exit; 1370 } 1371 id = from_kgid(&init_user_ns, gid); 1372 if (id_from_sid) { 1373 struct owner_sid *gsid = (struct owner_sid *)ngroup_sid_ptr; 1374 /* Populate the group ownership fields S-1-5-88-2 */ 1375 gsid->Revision = 1; 1376 gsid->NumAuth = 3; 1377 gsid->Authority[5] = 5; 1378 gsid->SubAuthorities[0] = cpu_to_le32(88); 1379 gsid->SubAuthorities[1] = cpu_to_le32(2); 1380 gsid->SubAuthorities[2] = cpu_to_le32(id); 1381 1382 } else { /* lookup sid with upcall */ 1383 rc = id_to_sid(id, SIDGROUP, ngroup_sid_ptr); 1384 if (rc) { 1385 cifs_dbg(FYI, "%s: Mapping error %d for group id %d\n", 1386 __func__, rc, id); 1387 goto chown_chgrp_exit; 1388 } 1389 } 1390 *aclflag |= CIFS_ACL_GROUP; 1391 } 1392 1393 if (dacloffset) { 1394 /* Replace ACEs for old owner with new one */ 1395 size = replace_sids_and_copy_aces(dacl_ptr, ndacl_ptr, 1396 owner_sid_ptr, group_sid_ptr, 1397 nowner_sid_ptr, ngroup_sid_ptr); 1398 ndacl_ptr->size = cpu_to_le16(size); 1399 } 1400 1401 sidsoffset = ndacloffset + le16_to_cpu(ndacl_ptr->size); 1402 /* copy the non-dacl portion of secdesc */ 1403 *pnsecdesclen = copy_sec_desc(pntsd, pnntsd, sidsoffset, 1404 nowner_sid_ptr, ngroup_sid_ptr); 1405 1406chown_chgrp_exit: 1407 /* errors could jump here. So make sure we return soon after this */ 1408 kfree(nowner_sid_ptr); 1409 kfree(ngroup_sid_ptr); 1410 } 1411 1412 return rc; 1413} 1414 1415#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1416struct smb_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *cifs_sb, 1417 const struct cifs_fid *cifsfid, u32 *pacllen, 1418 u32 info) 1419{ 1420 struct smb_ntsd *pntsd = NULL; 1421 unsigned int xid; 1422 int rc; 1423 struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); 1424 1425 if (IS_ERR(tlink)) 1426 return ERR_CAST(tlink); 1427 1428 xid = get_xid(); 1429 rc = CIFSSMBGetCIFSACL(xid, tlink_tcon(tlink), cifsfid->netfid, &pntsd, 1430 pacllen, info); 1431 free_xid(xid); 1432 1433 cifs_put_tlink(tlink); 1434 1435 cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); 1436 if (rc) 1437 return ERR_PTR(rc); 1438 return pntsd; 1439} 1440 1441static struct smb_ntsd *get_cifs_acl_by_path(struct cifs_sb_info *cifs_sb, 1442 const char *path, u32 *pacllen, u32 info) 1443{ 1444 struct smb_ntsd *pntsd = NULL; 1445 int oplock = 0; 1446 unsigned int xid; 1447 int rc; 1448 struct cifs_tcon *tcon; 1449 struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); 1450 struct cifs_fid fid; 1451 struct cifs_open_parms oparms; 1452 1453 if (IS_ERR(tlink)) 1454 return ERR_CAST(tlink); 1455 1456 tcon = tlink_tcon(tlink); 1457 xid = get_xid(); 1458 1459 oparms = (struct cifs_open_parms) { 1460 .tcon = tcon, 1461 .cifs_sb = cifs_sb, 1462 .desired_access = READ_CONTROL, 1463 .create_options = cifs_create_options(cifs_sb, 0), 1464 .disposition = FILE_OPEN, 1465 .path = path, 1466 .fid = &fid, 1467 }; 1468 1469 if (info & SACL_SECINFO) 1470 oparms.desired_access |= SYSTEM_SECURITY; 1471 1472 rc = CIFS_open(xid, &oparms, &oplock, NULL); 1473 if (!rc) { 1474 rc = CIFSSMBGetCIFSACL(xid, tcon, fid.netfid, &pntsd, pacllen, info); 1475 CIFSSMBClose(xid, tcon, fid.netfid); 1476 } 1477 1478 cifs_put_tlink(tlink); 1479 free_xid(xid); 1480 1481 cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen); 1482 if (rc) 1483 return ERR_PTR(rc); 1484 return pntsd; 1485} 1486 1487/* Retrieve an ACL from the server */ 1488struct smb_ntsd *get_cifs_acl(struct cifs_sb_info *cifs_sb, 1489 struct inode *inode, const char *path, 1490 u32 *pacllen, u32 info) 1491{ 1492 struct smb_ntsd *pntsd = NULL; 1493 struct cifsFileInfo *open_file = NULL; 1494 1495 if (inode) 1496 open_file = find_readable_file(CIFS_I(inode), true); 1497 if (!open_file) 1498 return get_cifs_acl_by_path(cifs_sb, path, pacllen, info); 1499 1500 pntsd = get_cifs_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info); 1501 cifsFileInfo_put(open_file); 1502 return pntsd; 1503} 1504 1505 /* Set an ACL on the server */ 1506int set_cifs_acl(struct smb_ntsd *pnntsd, __u32 acllen, 1507 struct inode *inode, const char *path, int aclflag) 1508{ 1509 int oplock = 0; 1510 unsigned int xid; 1511 int rc, access_flags = 0; 1512 struct cifs_tcon *tcon; 1513 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1514 struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); 1515 struct cifs_fid fid; 1516 struct cifs_open_parms oparms; 1517 1518 if (IS_ERR(tlink)) 1519 return PTR_ERR(tlink); 1520 1521 tcon = tlink_tcon(tlink); 1522 xid = get_xid(); 1523 1524 if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP) 1525 access_flags |= WRITE_OWNER; 1526 if (aclflag & CIFS_ACL_SACL) 1527 access_flags |= SYSTEM_SECURITY; 1528 if (aclflag & CIFS_ACL_DACL) 1529 access_flags |= WRITE_DAC; 1530 1531 oparms = (struct cifs_open_parms) { 1532 .tcon = tcon, 1533 .cifs_sb = cifs_sb, 1534 .desired_access = access_flags, 1535 .create_options = cifs_create_options(cifs_sb, 0), 1536 .disposition = FILE_OPEN, 1537 .path = path, 1538 .fid = &fid, 1539 }; 1540 1541 rc = CIFS_open(xid, &oparms, &oplock, NULL); 1542 if (rc) { 1543 cifs_dbg(VFS, "Unable to open file to set ACL\n"); 1544 goto out; 1545 } 1546 1547 rc = CIFSSMBSetCIFSACL(xid, tcon, fid.netfid, pnntsd, acllen, aclflag); 1548 cifs_dbg(NOISY, "SetCIFSACL rc = %d\n", rc); 1549 1550 CIFSSMBClose(xid, tcon, fid.netfid); 1551out: 1552 free_xid(xid); 1553 cifs_put_tlink(tlink); 1554 return rc; 1555} 1556#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1557 1558/* Translate the CIFS ACL (similar to NTFS ACL) for a file into mode bits */ 1559int 1560cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, 1561 struct inode *inode, bool mode_from_special_sid, 1562 const char *path, const struct cifs_fid *pfid) 1563{ 1564 struct smb_ntsd *pntsd = NULL; 1565 u32 acllen = 0; 1566 int rc = 0; 1567 struct tcon_link *tlink = cifs_sb_tlink(cifs_sb); 1568 struct smb_version_operations *ops; 1569 const u32 info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO; 1570 1571 cifs_dbg(NOISY, "converting ACL to mode for %s\n", path); 1572 1573 if (IS_ERR(tlink)) 1574 return PTR_ERR(tlink); 1575 1576 ops = tlink_tcon(tlink)->ses->server->ops; 1577 1578 if (pfid && (ops->get_acl_by_fid)) 1579 pntsd = ops->get_acl_by_fid(cifs_sb, pfid, &acllen, info); 1580 else if (ops->get_acl) 1581 pntsd = ops->get_acl(cifs_sb, inode, path, &acllen, info); 1582 else { 1583 cifs_put_tlink(tlink); 1584 return -EOPNOTSUPP; 1585 } 1586 /* if we can retrieve the ACL, now parse Access Control Entries, ACEs */ 1587 if (IS_ERR(pntsd)) { 1588 rc = PTR_ERR(pntsd); 1589 cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); 1590 } else if (mode_from_special_sid) { 1591 rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, true); 1592 kfree(pntsd); 1593 } else { 1594 /* get approximated mode from ACL */ 1595 rc = parse_sec_desc(cifs_sb, pntsd, acllen, fattr, false); 1596 kfree(pntsd); 1597 if (rc) 1598 cifs_dbg(VFS, "parse sec desc failed rc = %d\n", rc); 1599 } 1600 1601 cifs_put_tlink(tlink); 1602 1603 return rc; 1604} 1605 1606/* Convert mode bits to an ACL so we can update the ACL on the server */ 1607int 1608id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode, 1609 kuid_t uid, kgid_t gid) 1610{ 1611 int rc = 0; 1612 int aclflag = CIFS_ACL_DACL; /* default flag to set */ 1613 __u32 secdesclen = 0; 1614 __u32 nsecdesclen = 0; 1615 __u32 dacloffset = 0; 1616 struct smb_acl *dacl_ptr = NULL; 1617 struct smb_ntsd *pntsd = NULL; /* acl obtained from server */ 1618 struct smb_ntsd *pnntsd = NULL; /* modified acl to be sent to server */ 1619 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1620 struct tcon_link *tlink; 1621 struct smb_version_operations *ops; 1622 bool mode_from_sid, id_from_sid; 1623 const u32 info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO; 1624 bool posix; 1625 1626 tlink = cifs_sb_tlink(cifs_sb); 1627 if (IS_ERR(tlink)) 1628 return PTR_ERR(tlink); 1629 posix = tlink_tcon(tlink)->posix_extensions; 1630 1631 ops = tlink_tcon(tlink)->ses->server->ops; 1632 1633 cifs_dbg(NOISY, "set ACL from mode for %s\n", path); 1634 1635 /* Get the security descriptor */ 1636 1637 if (ops->get_acl == NULL) { 1638 cifs_put_tlink(tlink); 1639 return -EOPNOTSUPP; 1640 } 1641 1642 pntsd = ops->get_acl(cifs_sb, inode, path, &secdesclen, info); 1643 if (IS_ERR(pntsd)) { 1644 rc = PTR_ERR(pntsd); 1645 cifs_dbg(VFS, "%s: error %d getting sec desc\n", __func__, rc); 1646 cifs_put_tlink(tlink); 1647 return rc; 1648 } 1649 1650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) 1651 mode_from_sid = true; 1652 else 1653 mode_from_sid = false; 1654 1655 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) 1656 id_from_sid = true; 1657 else 1658 id_from_sid = false; 1659 1660 /* Potentially, five new ACEs can be added to the ACL for U,G,O mapping */ 1661 if (pnmode && *pnmode != NO_CHANGE_64) { /* chmod */ 1662 if (posix) 1663 nsecdesclen = 1 * sizeof(struct smb_ace); 1664 else if (mode_from_sid) 1665 nsecdesclen = secdesclen + (2 * sizeof(struct smb_ace)); 1666 else /* cifsacl */ 1667 nsecdesclen = secdesclen + (5 * sizeof(struct smb_ace)); 1668 } else { /* chown */ 1669 /* When ownership changes, changes new owner sid length could be different */ 1670 nsecdesclen = sizeof(struct smb_ntsd) + (sizeof(struct smb_sid) * 2); 1671 dacloffset = le32_to_cpu(pntsd->dacloffset); 1672 if (dacloffset) { 1673 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset); 1674 if (mode_from_sid) 1675 nsecdesclen += 1676 le16_to_cpu(dacl_ptr->num_aces) * sizeof(struct smb_ace); 1677 else /* cifsacl */ 1678 nsecdesclen += le16_to_cpu(dacl_ptr->size); 1679 } 1680 } 1681 1682 /* 1683 * Add three ACEs for owner, group, everyone getting rid of other ACEs 1684 * as chmod disables ACEs and set the security descriptor. Allocate 1685 * memory for the smb header, set security descriptor request security 1686 * descriptor parameters, and security descriptor itself 1687 */ 1688 nsecdesclen = max_t(u32, nsecdesclen, DEFAULT_SEC_DESC_LEN); 1689 pnntsd = kmalloc(nsecdesclen, GFP_KERNEL); 1690 if (!pnntsd) { 1691 kfree(pntsd); 1692 cifs_put_tlink(tlink); 1693 return -ENOMEM; 1694 } 1695 1696 rc = build_sec_desc(pntsd, pnntsd, secdesclen, &nsecdesclen, pnmode, uid, gid, 1697 mode_from_sid, id_from_sid, posix, &aclflag); 1698 1699 cifs_dbg(NOISY, "build_sec_desc rc: %d\n", rc); 1700 1701 if (ops->set_acl == NULL) 1702 rc = -EOPNOTSUPP; 1703 1704 if (!rc) { 1705 /* Set the security descriptor */ 1706 rc = ops->set_acl(pnntsd, nsecdesclen, inode, path, aclflag); 1707 cifs_dbg(NOISY, "set_cifs_acl rc: %d\n", rc); 1708 } 1709 cifs_put_tlink(tlink); 1710 1711 kfree(pnntsd); 1712 kfree(pntsd); 1713 return rc; 1714} 1715 1716struct posix_acl *cifs_get_acl(struct mnt_idmap *idmap, 1717 struct dentry *dentry, int type) 1718{ 1719#if defined(CONFIG_CIFS_ALLOW_INSECURE_LEGACY) && defined(CONFIG_CIFS_POSIX) 1720 struct posix_acl *acl = NULL; 1721 ssize_t rc = -EOPNOTSUPP; 1722 unsigned int xid; 1723 struct super_block *sb = dentry->d_sb; 1724 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1725 struct tcon_link *tlink; 1726 struct cifs_tcon *pTcon; 1727 const char *full_path; 1728 void *page; 1729 1730 tlink = cifs_sb_tlink(cifs_sb); 1731 if (IS_ERR(tlink)) 1732 return ERR_CAST(tlink); 1733 pTcon = tlink_tcon(tlink); 1734 1735 xid = get_xid(); 1736 page = alloc_dentry_path(); 1737 1738 full_path = build_path_from_dentry(dentry, page); 1739 if (IS_ERR(full_path)) { 1740 acl = ERR_CAST(full_path); 1741 goto out; 1742 } 1743 1744 /* return alt name if available as pseudo attr */ 1745 switch (type) { 1746 case ACL_TYPE_ACCESS: 1747 if (sb->s_flags & SB_POSIXACL) 1748 rc = cifs_do_get_acl(xid, pTcon, full_path, &acl, 1749 ACL_TYPE_ACCESS, 1750 cifs_sb->local_nls, 1751 cifs_remap(cifs_sb)); 1752 break; 1753 1754 case ACL_TYPE_DEFAULT: 1755 if (sb->s_flags & SB_POSIXACL) 1756 rc = cifs_do_get_acl(xid, pTcon, full_path, &acl, 1757 ACL_TYPE_DEFAULT, 1758 cifs_sb->local_nls, 1759 cifs_remap(cifs_sb)); 1760 break; 1761 } 1762 1763 if (rc < 0) { 1764 if (rc == -EINVAL) 1765 acl = ERR_PTR(-EOPNOTSUPP); 1766 else 1767 acl = ERR_PTR(rc); 1768 } 1769 1770out: 1771 free_dentry_path(page); 1772 free_xid(xid); 1773 cifs_put_tlink(tlink); 1774 return acl; 1775#else 1776 return ERR_PTR(-EOPNOTSUPP); 1777#endif 1778} 1779 1780int cifs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 1781 struct posix_acl *acl, int type) 1782{ 1783#if defined(CONFIG_CIFS_ALLOW_INSECURE_LEGACY) && defined(CONFIG_CIFS_POSIX) 1784 int rc = -EOPNOTSUPP; 1785 unsigned int xid; 1786 struct super_block *sb = dentry->d_sb; 1787 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1788 struct tcon_link *tlink; 1789 struct cifs_tcon *pTcon; 1790 const char *full_path; 1791 void *page; 1792 1793 tlink = cifs_sb_tlink(cifs_sb); 1794 if (IS_ERR(tlink)) 1795 return PTR_ERR(tlink); 1796 pTcon = tlink_tcon(tlink); 1797 1798 xid = get_xid(); 1799 page = alloc_dentry_path(); 1800 1801 full_path = build_path_from_dentry(dentry, page); 1802 if (IS_ERR(full_path)) { 1803 rc = PTR_ERR(full_path); 1804 goto out; 1805 } 1806 1807 if (!acl) 1808 goto out; 1809 1810 /* return dos attributes as pseudo xattr */ 1811 /* return alt name if available as pseudo attr */ 1812 1813 /* if proc/fs/cifs/streamstoxattr is set then 1814 search server for EAs or streams to 1815 returns as xattrs */ 1816 if (posix_acl_xattr_size(acl->a_count) > CIFSMaxBufSize) { 1817 cifs_dbg(FYI, "size of EA value too large\n"); 1818 rc = -EOPNOTSUPP; 1819 goto out; 1820 } 1821 1822 switch (type) { 1823 case ACL_TYPE_ACCESS: 1824 if (sb->s_flags & SB_POSIXACL) 1825 rc = cifs_do_set_acl(xid, pTcon, full_path, acl, 1826 ACL_TYPE_ACCESS, 1827 cifs_sb->local_nls, 1828 cifs_remap(cifs_sb)); 1829 break; 1830 1831 case ACL_TYPE_DEFAULT: 1832 if (sb->s_flags & SB_POSIXACL) 1833 rc = cifs_do_set_acl(xid, pTcon, full_path, acl, 1834 ACL_TYPE_DEFAULT, 1835 cifs_sb->local_nls, 1836 cifs_remap(cifs_sb)); 1837 break; 1838 } 1839 1840out: 1841 free_dentry_path(page); 1842 free_xid(xid); 1843 cifs_put_tlink(tlink); 1844 return rc; 1845#else 1846 return -EOPNOTSUPP; 1847#endif 1848}
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