1 // SPDX-License-Identifier: LGPL-2.1+ 2 /* 3 * Copyright (C) International Business Machines Corp., 2007,2008 4 * Author(s): Steve French (sfrench@us.ibm.com) 5 * Copyright (C) 2020 Samsung Electronics Co., Ltd. 6 * Author(s): Namjae Jeon <linkinjeon@kernel.org> 7 */ 8 9 #include <linux/fs.h> 10 #include <linux/slab.h> 11 #include <linux/string.h> 12 #include <linux/mnt_idmapping.h> 13 14 #include "smbacl.h" 15 #include "smb_common.h" 16 #include "server.h" 17 #include "misc.h" 18 #include "mgmt/share_config.h" 19 20 static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5}, 21 {cpu_to_le32(21), cpu_to_le32(1), cpu_to_le32(2), cpu_to_le32(3), 22 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 23 24 /* security id for everyone/world system group */ 25 static const struct smb_sid creator_owner = { 26 1, 1, {0, 0, 0, 0, 0, 3}, {0} }; 27 /* security id for everyone/world system group */ 28 static const struct smb_sid creator_group = { 29 1, 1, {0, 0, 0, 0, 0, 3}, {cpu_to_le32(1)} }; 30 31 /* security id for everyone/world system group */ 32 static const struct smb_sid sid_everyone = { 33 1, 1, {0, 0, 0, 0, 0, 1}, {0} }; 34 /* security id for Authenticated Users system group */ 35 static const struct smb_sid sid_authusers = { 36 1, 1, {0, 0, 0, 0, 0, 5}, {cpu_to_le32(11)} }; 37 38 /* S-1-22-1 Unmapped Unix users */ 39 static const struct smb_sid sid_unix_users = {1, 1, {0, 0, 0, 0, 0, 22}, 40 {cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 41 42 /* S-1-22-2 Unmapped Unix groups */ 43 static const struct smb_sid sid_unix_groups = { 1, 1, {0, 0, 0, 0, 0, 22}, 44 {cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 45 46 /* 47 * See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx 48 */ 49 50 /* S-1-5-88 MS NFS and Apple style UID/GID/mode */ 51 52 /* S-1-5-88-1 Unix uid */ 53 static const struct smb_sid sid_unix_NFS_users = { 1, 2, {0, 0, 0, 0, 0, 5}, 54 {cpu_to_le32(88), 55 cpu_to_le32(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 56 57 /* S-1-5-88-2 Unix gid */ 58 static const struct smb_sid sid_unix_NFS_groups = { 1, 2, {0, 0, 0, 0, 0, 5}, 59 {cpu_to_le32(88), 60 cpu_to_le32(2), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 61 62 /* S-1-5-88-3 Unix mode */ 63 static const struct smb_sid sid_unix_NFS_mode = { 1, 2, {0, 0, 0, 0, 0, 5}, 64 {cpu_to_le32(88), 65 cpu_to_le32(3), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }; 66 67 /* 68 * if the two SIDs (roughly equivalent to a UUID for a user or group) are 69 * the same returns zero, if they do not match returns non-zero. 70 */ 71 int compare_sids(const struct smb_sid *ctsid, const struct smb_sid *cwsid) 72 { 73 int i; 74 int num_subauth, num_sat, num_saw; 75 76 if (!ctsid || !cwsid) 77 return 1; 78 79 /* compare the revision */ 80 if (ctsid->revision != cwsid->revision) { 81 if (ctsid->revision > cwsid->revision) 82 return 1; 83 else 84 return -1; 85 } 86 87 /* compare all of the six auth values */ 88 for (i = 0; i < NUM_AUTHS; ++i) { 89 if (ctsid->authority[i] != cwsid->authority[i]) { 90 if (ctsid->authority[i] > cwsid->authority[i]) 91 return 1; 92 else 93 return -1; 94 } 95 } 96 97 /* compare all of the subauth values if any */ 98 num_sat = ctsid->num_subauth; 99 num_saw = cwsid->num_subauth; 100 num_subauth = min(num_sat, num_saw); 101 if (num_subauth) { 102 for (i = 0; i < num_subauth; ++i) { 103 if (ctsid->sub_auth[i] != cwsid->sub_auth[i]) { 104 if (le32_to_cpu(ctsid->sub_auth[i]) > 105 le32_to_cpu(cwsid->sub_auth[i])) 106 return 1; 107 else 108 return -1; 109 } 110 } 111 } 112 113 return 0; /* sids compare/match */ 114 } 115 116 static void smb_copy_sid(struct smb_sid *dst, const struct smb_sid *src) 117 { 118 int i; 119 120 dst->revision = src->revision; 121 dst->num_subauth = min_t(u8, src->num_subauth, SID_MAX_SUB_AUTHORITIES); 122 for (i = 0; i < NUM_AUTHS; ++i) 123 dst->authority[i] = src->authority[i]; 124 for (i = 0; i < dst->num_subauth; ++i) 125 dst->sub_auth[i] = src->sub_auth[i]; 126 } 127 128 /* 129 * change posix mode to reflect permissions 130 * pmode is the existing mode (we only want to overwrite part of this 131 * bits to set can be: S_IRWXU, S_IRWXG or S_IRWXO ie 00700 or 00070 or 00007 132 */ 133 static umode_t access_flags_to_mode(struct smb_fattr *fattr, __le32 ace_flags, 134 int type) 135 { 136 __u32 flags = le32_to_cpu(ace_flags); 137 umode_t mode = 0; 138 139 if (flags & GENERIC_ALL) { 140 mode = 0777; 141 ksmbd_debug(SMB, "all perms\n"); 142 return mode; 143 } 144 145 if ((flags & GENERIC_READ) || (flags & FILE_READ_RIGHTS)) 146 mode = 0444; 147 if ((flags & GENERIC_WRITE) || (flags & FILE_WRITE_RIGHTS)) { 148 mode |= 0222; 149 if (S_ISDIR(fattr->cf_mode)) 150 mode |= 0111; 151 } 152 if ((flags & GENERIC_EXECUTE) || (flags & FILE_EXEC_RIGHTS)) 153 mode |= 0111; 154 155 if (type == ACCESS_DENIED_ACE_TYPE || type == ACCESS_DENIED_OBJECT_ACE_TYPE) 156 mode = ~mode; 157 158 ksmbd_debug(SMB, "access flags 0x%x mode now %04o\n", flags, mode); 159 160 return mode; 161 } 162 163 /* 164 * Generate access flags to reflect permissions mode is the existing mode. 165 * This function is called for every ACE in the DACL whose SID matches 166 * with either owner or group or everyone. 167 */ 168 static void mode_to_access_flags(umode_t mode, umode_t bits_to_use, 169 __u32 *pace_flags) 170 { 171 /* reset access mask */ 172 *pace_flags = 0x0; 173 174 /* bits to use are either S_IRWXU or S_IRWXG or S_IRWXO */ 175 mode &= bits_to_use; 176 177 /* 178 * check for R/W/X UGO since we do not know whose flags 179 * is this but we have cleared all the bits sans RWX for 180 * either user or group or other as per bits_to_use 181 */ 182 if (mode & 0444) 183 *pace_flags |= SET_FILE_READ_RIGHTS; 184 if (mode & 0222) 185 *pace_flags |= FILE_WRITE_RIGHTS; 186 if (mode & 0111) 187 *pace_flags |= SET_FILE_EXEC_RIGHTS; 188 189 ksmbd_debug(SMB, "mode: %o, access flags now 0x%x\n", 190 mode, *pace_flags); 191 } 192 193 static __u16 fill_ace_for_sid(struct smb_ace *pntace, 194 const struct smb_sid *psid, int type, int flags, 195 umode_t mode, umode_t bits) 196 { 197 int i; 198 __u16 size = 0; 199 __u32 access_req = 0; 200 201 pntace->type = type; 202 pntace->flags = flags; 203 mode_to_access_flags(mode, bits, &access_req); 204 if (!access_req) 205 access_req = SET_MINIMUM_RIGHTS; 206 pntace->access_req = cpu_to_le32(access_req); 207 208 pntace->sid.revision = psid->revision; 209 pntace->sid.num_subauth = psid->num_subauth; 210 for (i = 0; i < NUM_AUTHS; i++) 211 pntace->sid.authority[i] = psid->authority[i]; 212 for (i = 0; i < psid->num_subauth; i++) 213 pntace->sid.sub_auth[i] = psid->sub_auth[i]; 214 215 size = 1 + 1 + 2 + 4 + 1 + 1 + 6 + (psid->num_subauth * 4); 216 pntace->size = cpu_to_le16(size); 217 218 return size; 219 } 220 221 void id_to_sid(unsigned int cid, uint sidtype, struct smb_sid *ssid) 222 { 223 switch (sidtype) { 224 case SIDOWNER: 225 smb_copy_sid(ssid, &server_conf.domain_sid); 226 break; 227 case SIDUNIX_USER: 228 smb_copy_sid(ssid, &sid_unix_users); 229 break; 230 case SIDUNIX_GROUP: 231 smb_copy_sid(ssid, &sid_unix_groups); 232 break; 233 case SIDCREATOR_OWNER: 234 smb_copy_sid(ssid, &creator_owner); 235 return; 236 case SIDCREATOR_GROUP: 237 smb_copy_sid(ssid, &creator_group); 238 return; 239 case SIDNFS_USER: 240 smb_copy_sid(ssid, &sid_unix_NFS_users); 241 break; 242 case SIDNFS_GROUP: 243 smb_copy_sid(ssid, &sid_unix_NFS_groups); 244 break; 245 case SIDNFS_MODE: 246 smb_copy_sid(ssid, &sid_unix_NFS_mode); 247 break; 248 default: 249 return; 250 } 251 252 /* RID */ 253 ssid->sub_auth[ssid->num_subauth] = cpu_to_le32(cid); 254 ssid->num_subauth++; 255 } 256 257 static int sid_to_id(struct mnt_idmap *idmap, 258 struct smb_sid *psid, uint sidtype, 259 struct smb_fattr *fattr) 260 { 261 int rc = -EINVAL; 262 263 /* 264 * If we have too many subauthorities, then something is really wrong. 265 * Just return an error. 266 */ 267 if (unlikely(psid->num_subauth > SID_MAX_SUB_AUTHORITIES)) { 268 pr_err("%s: %u subauthorities is too many!\n", 269 __func__, psid->num_subauth); 270 return -EIO; 271 } 272 273 if (sidtype == SIDOWNER) { 274 kuid_t uid; 275 uid_t id; 276 277 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]); 278 uid = KUIDT_INIT(id); 279 uid = from_vfsuid(idmap, &init_user_ns, VFSUIDT_INIT(uid)); 280 if (uid_valid(uid)) { 281 fattr->cf_uid = uid; 282 rc = 0; 283 } 284 } else { 285 kgid_t gid; 286 gid_t id; 287 288 id = le32_to_cpu(psid->sub_auth[psid->num_subauth - 1]); 289 gid = KGIDT_INIT(id); 290 gid = from_vfsgid(idmap, &init_user_ns, VFSGIDT_INIT(gid)); 291 if (gid_valid(gid)) { 292 fattr->cf_gid = gid; 293 rc = 0; 294 } 295 } 296 297 return rc; 298 } 299 300 void posix_state_to_acl(struct posix_acl_state *state, 301 struct posix_acl_entry *pace) 302 { 303 int i; 304 305 pace->e_tag = ACL_USER_OBJ; 306 pace->e_perm = state->owner.allow; 307 for (i = 0; i < state->users->n; i++) { 308 pace++; 309 pace->e_tag = ACL_USER; 310 pace->e_uid = state->users->aces[i].uid; 311 pace->e_perm = state->users->aces[i].perms.allow; 312 } 313 314 pace++; 315 pace->e_tag = ACL_GROUP_OBJ; 316 pace->e_perm = state->group.allow; 317 318 for (i = 0; i < state->groups->n; i++) { 319 pace++; 320 pace->e_tag = ACL_GROUP; 321 pace->e_gid = state->groups->aces[i].gid; 322 pace->e_perm = state->groups->aces[i].perms.allow; 323 } 324 325 if (state->users->n || state->groups->n) { 326 pace++; 327 pace->e_tag = ACL_MASK; 328 pace->e_perm = state->mask.allow; 329 } 330 331 pace++; 332 pace->e_tag = ACL_OTHER; 333 pace->e_perm = state->other.allow; 334 } 335 336 int init_acl_state(struct posix_acl_state *state, int cnt) 337 { 338 int alloc; 339 340 memset(state, 0, sizeof(struct posix_acl_state)); 341 /* 342 * In the worst case, each individual acl could be for a distinct 343 * named user or group, but we don't know which, so we allocate 344 * enough space for either: 345 */ 346 alloc = sizeof(struct posix_ace_state_array) 347 + cnt * sizeof(struct posix_user_ace_state); 348 state->users = kzalloc(alloc, GFP_KERNEL); 349 if (!state->users) 350 return -ENOMEM; 351 state->groups = kzalloc(alloc, GFP_KERNEL); 352 if (!state->groups) { 353 kfree(state->users); 354 return -ENOMEM; 355 } 356 return 0; 357 } 358 359 void free_acl_state(struct posix_acl_state *state) 360 { 361 kfree(state->users); 362 kfree(state->groups); 363 } 364 365 static void parse_dacl(struct mnt_idmap *idmap, 366 struct smb_acl *pdacl, char *end_of_acl, 367 struct smb_sid *pownersid, struct smb_sid *pgrpsid, 368 struct smb_fattr *fattr) 369 { 370 int i, ret; 371 int num_aces = 0; 372 unsigned int acl_size; 373 char *acl_base; 374 struct smb_ace **ppace; 375 struct posix_acl_entry *cf_pace, *cf_pdace; 376 struct posix_acl_state acl_state, default_acl_state; 377 umode_t mode = 0, acl_mode; 378 bool owner_found = false, group_found = false, others_found = false; 379 380 if (!pdacl) 381 return; 382 383 /* validate that we do not go past end of acl */ 384 if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) || 385 end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { 386 pr_err("ACL too small to parse DACL\n"); 387 return; 388 } 389 390 ksmbd_debug(SMB, "DACL revision %d size %d num aces %d\n", 391 le16_to_cpu(pdacl->revision), le16_to_cpu(pdacl->size), 392 le32_to_cpu(pdacl->num_aces)); 393 394 acl_base = (char *)pdacl; 395 acl_size = sizeof(struct smb_acl); 396 397 num_aces = le32_to_cpu(pdacl->num_aces); 398 if (num_aces <= 0) 399 return; 400 401 if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) 402 return; 403 404 ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), GFP_KERNEL); 405 if (!ppace) 406 return; 407 408 ret = init_acl_state(&acl_state, num_aces); 409 if (ret) 410 return; 411 ret = init_acl_state(&default_acl_state, num_aces); 412 if (ret) { 413 free_acl_state(&acl_state); 414 return; 415 } 416 417 /* 418 * reset rwx permissions for user/group/other. 419 * Also, if num_aces is 0 i.e. DACL has no ACEs, 420 * user/group/other have no permissions 421 */ 422 for (i = 0; i < num_aces; ++i) { 423 if (end_of_acl - acl_base < acl_size) 424 break; 425 426 ppace[i] = (struct smb_ace *)(acl_base + acl_size); 427 acl_base = (char *)ppace[i]; 428 acl_size = offsetof(struct smb_ace, sid) + 429 offsetof(struct smb_sid, sub_auth); 430 431 if (end_of_acl - acl_base < acl_size || 432 ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES || 433 (end_of_acl - acl_base < 434 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) || 435 (le16_to_cpu(ppace[i]->size) < 436 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth)) 437 break; 438 439 acl_size = le16_to_cpu(ppace[i]->size); 440 ppace[i]->access_req = 441 smb_map_generic_desired_access(ppace[i]->access_req); 442 443 if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) { 444 fattr->cf_mode = 445 le32_to_cpu(ppace[i]->sid.sub_auth[2]); 446 break; 447 } else if (!compare_sids(&ppace[i]->sid, pownersid)) { 448 acl_mode = access_flags_to_mode(fattr, 449 ppace[i]->access_req, 450 ppace[i]->type); 451 acl_mode &= 0700; 452 453 if (!owner_found) { 454 mode &= ~(0700); 455 mode |= acl_mode; 456 } 457 owner_found = true; 458 } else if (!compare_sids(&ppace[i]->sid, pgrpsid) || 459 ppace[i]->sid.sub_auth[ppace[i]->sid.num_subauth - 1] == 460 DOMAIN_USER_RID_LE) { 461 acl_mode = access_flags_to_mode(fattr, 462 ppace[i]->access_req, 463 ppace[i]->type); 464 acl_mode &= 0070; 465 if (!group_found) { 466 mode &= ~(0070); 467 mode |= acl_mode; 468 } 469 group_found = true; 470 } else if (!compare_sids(&ppace[i]->sid, &sid_everyone)) { 471 acl_mode = access_flags_to_mode(fattr, 472 ppace[i]->access_req, 473 ppace[i]->type); 474 acl_mode &= 0007; 475 if (!others_found) { 476 mode &= ~(0007); 477 mode |= acl_mode; 478 } 479 others_found = true; 480 } else if (!compare_sids(&ppace[i]->sid, &creator_owner)) { 481 continue; 482 } else if (!compare_sids(&ppace[i]->sid, &creator_group)) { 483 continue; 484 } else if (!compare_sids(&ppace[i]->sid, &sid_authusers)) { 485 continue; 486 } else { 487 struct smb_fattr temp_fattr; 488 489 acl_mode = access_flags_to_mode(fattr, ppace[i]->access_req, 490 ppace[i]->type); 491 temp_fattr.cf_uid = INVALID_UID; 492 ret = sid_to_id(idmap, &ppace[i]->sid, SIDOWNER, &temp_fattr); 493 if (ret || uid_eq(temp_fattr.cf_uid, INVALID_UID)) { 494 pr_err("%s: Error %d mapping Owner SID to uid\n", 495 __func__, ret); 496 continue; 497 } 498 499 acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004; 500 acl_state.users->aces[acl_state.users->n].uid = 501 temp_fattr.cf_uid; 502 acl_state.users->aces[acl_state.users->n++].perms.allow = 503 ((acl_mode & 0700) >> 6) | 0004; 504 default_acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004; 505 default_acl_state.users->aces[default_acl_state.users->n].uid = 506 temp_fattr.cf_uid; 507 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow = 508 ((acl_mode & 0700) >> 6) | 0004; 509 } 510 } 511 kfree(ppace); 512 513 if (owner_found) { 514 /* The owner must be set to at least read-only. */ 515 acl_state.owner.allow = ((mode & 0700) >> 6) | 0004; 516 acl_state.users->aces[acl_state.users->n].uid = fattr->cf_uid; 517 acl_state.users->aces[acl_state.users->n++].perms.allow = 518 ((mode & 0700) >> 6) | 0004; 519 default_acl_state.owner.allow = ((mode & 0700) >> 6) | 0004; 520 default_acl_state.users->aces[default_acl_state.users->n].uid = 521 fattr->cf_uid; 522 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow = 523 ((mode & 0700) >> 6) | 0004; 524 } 525 526 if (group_found) { 527 acl_state.group.allow = (mode & 0070) >> 3; 528 acl_state.groups->aces[acl_state.groups->n].gid = 529 fattr->cf_gid; 530 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 531 (mode & 0070) >> 3; 532 default_acl_state.group.allow = (mode & 0070) >> 3; 533 default_acl_state.groups->aces[default_acl_state.groups->n].gid = 534 fattr->cf_gid; 535 default_acl_state.groups->aces[default_acl_state.groups->n++].perms.allow = 536 (mode & 0070) >> 3; 537 } 538 539 if (others_found) { 540 fattr->cf_mode &= ~(0007); 541 fattr->cf_mode |= mode & 0007; 542 543 acl_state.other.allow = mode & 0007; 544 default_acl_state.other.allow = mode & 0007; 545 } 546 547 if (acl_state.users->n || acl_state.groups->n) { 548 acl_state.mask.allow = 0x07; 549 550 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 551 fattr->cf_acls = 552 posix_acl_alloc(acl_state.users->n + 553 acl_state.groups->n + 4, GFP_KERNEL); 554 if (fattr->cf_acls) { 555 cf_pace = fattr->cf_acls->a_entries; 556 posix_state_to_acl(&acl_state, cf_pace); 557 } 558 } 559 } 560 561 if (default_acl_state.users->n || default_acl_state.groups->n) { 562 default_acl_state.mask.allow = 0x07; 563 564 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 565 fattr->cf_dacls = 566 posix_acl_alloc(default_acl_state.users->n + 567 default_acl_state.groups->n + 4, GFP_KERNEL); 568 if (fattr->cf_dacls) { 569 cf_pdace = fattr->cf_dacls->a_entries; 570 posix_state_to_acl(&default_acl_state, cf_pdace); 571 } 572 } 573 } 574 free_acl_state(&acl_state); 575 free_acl_state(&default_acl_state); 576 } 577 578 static void set_posix_acl_entries_dacl(struct mnt_idmap *idmap, 579 struct smb_ace *pndace, 580 struct smb_fattr *fattr, u32 *num_aces, 581 u16 *size, u32 nt_aces_num) 582 { 583 struct posix_acl_entry *pace; 584 struct smb_sid *sid; 585 struct smb_ace *ntace; 586 int i, j; 587 588 if (!fattr->cf_acls) 589 goto posix_default_acl; 590 591 pace = fattr->cf_acls->a_entries; 592 for (i = 0; i < fattr->cf_acls->a_count; i++, pace++) { 593 int flags = 0; 594 595 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL); 596 if (!sid) 597 break; 598 599 if (pace->e_tag == ACL_USER) { 600 uid_t uid; 601 unsigned int sid_type = SIDOWNER; 602 603 uid = posix_acl_uid_translate(idmap, pace); 604 if (!uid) 605 sid_type = SIDUNIX_USER; 606 id_to_sid(uid, sid_type, sid); 607 } else if (pace->e_tag == ACL_GROUP) { 608 gid_t gid; 609 610 gid = posix_acl_gid_translate(idmap, pace); 611 id_to_sid(gid, SIDUNIX_GROUP, sid); 612 } else if (pace->e_tag == ACL_OTHER && !nt_aces_num) { 613 smb_copy_sid(sid, &sid_everyone); 614 } else { 615 kfree(sid); 616 continue; 617 } 618 ntace = pndace; 619 for (j = 0; j < nt_aces_num; j++) { 620 if (ntace->sid.sub_auth[ntace->sid.num_subauth - 1] == 621 sid->sub_auth[sid->num_subauth - 1]) 622 goto pass_same_sid; 623 ntace = (struct smb_ace *)((char *)ntace + 624 le16_to_cpu(ntace->size)); 625 } 626 627 if (S_ISDIR(fattr->cf_mode) && pace->e_tag == ACL_OTHER) 628 flags = 0x03; 629 630 ntace = (struct smb_ace *)((char *)pndace + *size); 631 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags, 632 pace->e_perm, 0777); 633 (*num_aces)++; 634 if (pace->e_tag == ACL_USER) 635 ntace->access_req |= 636 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 637 638 if (S_ISDIR(fattr->cf_mode) && 639 (pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) { 640 ntace = (struct smb_ace *)((char *)pndace + *size); 641 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 642 0x03, pace->e_perm, 0777); 643 (*num_aces)++; 644 if (pace->e_tag == ACL_USER) 645 ntace->access_req |= 646 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 647 } 648 649 pass_same_sid: 650 kfree(sid); 651 } 652 653 if (nt_aces_num) 654 return; 655 656 posix_default_acl: 657 if (!fattr->cf_dacls) 658 return; 659 660 pace = fattr->cf_dacls->a_entries; 661 for (i = 0; i < fattr->cf_dacls->a_count; i++, pace++) { 662 sid = kmalloc(sizeof(struct smb_sid), GFP_KERNEL); 663 if (!sid) 664 break; 665 666 if (pace->e_tag == ACL_USER) { 667 uid_t uid; 668 669 uid = posix_acl_uid_translate(idmap, pace); 670 id_to_sid(uid, SIDCREATOR_OWNER, sid); 671 } else if (pace->e_tag == ACL_GROUP) { 672 gid_t gid; 673 674 gid = posix_acl_gid_translate(idmap, pace); 675 id_to_sid(gid, SIDCREATOR_GROUP, sid); 676 } else { 677 kfree(sid); 678 continue; 679 } 680 681 ntace = (struct smb_ace *)((char *)pndace + *size); 682 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b, 683 pace->e_perm, 0777); 684 (*num_aces)++; 685 if (pace->e_tag == ACL_USER) 686 ntace->access_req |= 687 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 688 kfree(sid); 689 } 690 } 691 692 static void set_ntacl_dacl(struct mnt_idmap *idmap, 693 struct smb_acl *pndacl, 694 struct smb_acl *nt_dacl, 695 unsigned int aces_size, 696 const struct smb_sid *pownersid, 697 const struct smb_sid *pgrpsid, 698 struct smb_fattr *fattr) 699 { 700 struct smb_ace *ntace, *pndace; 701 int nt_num_aces = le32_to_cpu(nt_dacl->num_aces), num_aces = 0; 702 unsigned short size = 0; 703 int i; 704 705 pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl)); 706 if (nt_num_aces) { 707 ntace = (struct smb_ace *)((char *)nt_dacl + sizeof(struct smb_acl)); 708 for (i = 0; i < nt_num_aces; i++) { 709 unsigned short nt_ace_size; 710 711 if (offsetof(struct smb_ace, access_req) > aces_size) 712 break; 713 714 nt_ace_size = le16_to_cpu(ntace->size); 715 if (nt_ace_size > aces_size) 716 break; 717 718 memcpy((char *)pndace + size, ntace, nt_ace_size); 719 size += nt_ace_size; 720 aces_size -= nt_ace_size; 721 ntace = (struct smb_ace *)((char *)ntace + nt_ace_size); 722 num_aces++; 723 } 724 } 725 726 set_posix_acl_entries_dacl(idmap, pndace, fattr, 727 &num_aces, &size, nt_num_aces); 728 pndacl->num_aces = cpu_to_le32(num_aces); 729 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); 730 } 731 732 static void set_mode_dacl(struct mnt_idmap *idmap, 733 struct smb_acl *pndacl, struct smb_fattr *fattr) 734 { 735 struct smb_ace *pace, *pndace; 736 u32 num_aces = 0; 737 u16 size = 0, ace_size = 0; 738 uid_t uid; 739 const struct smb_sid *sid; 740 741 pace = pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl)); 742 743 if (fattr->cf_acls) { 744 set_posix_acl_entries_dacl(idmap, pndace, fattr, 745 &num_aces, &size, num_aces); 746 goto out; 747 } 748 749 /* owner RID */ 750 uid = from_kuid(&init_user_ns, fattr->cf_uid); 751 if (uid) 752 sid = &server_conf.domain_sid; 753 else 754 sid = &sid_unix_users; 755 ace_size = fill_ace_for_sid(pace, sid, ACCESS_ALLOWED, 0, 756 fattr->cf_mode, 0700); 757 pace->sid.sub_auth[pace->sid.num_subauth++] = cpu_to_le32(uid); 758 pace->size = cpu_to_le16(ace_size + 4); 759 size += le16_to_cpu(pace->size); 760 pace = (struct smb_ace *)((char *)pndace + size); 761 762 /* Group RID */ 763 ace_size = fill_ace_for_sid(pace, &sid_unix_groups, 764 ACCESS_ALLOWED, 0, fattr->cf_mode, 0070); 765 pace->sid.sub_auth[pace->sid.num_subauth++] = 766 cpu_to_le32(from_kgid(&init_user_ns, fattr->cf_gid)); 767 pace->size = cpu_to_le16(ace_size + 4); 768 size += le16_to_cpu(pace->size); 769 pace = (struct smb_ace *)((char *)pndace + size); 770 num_aces = 3; 771 772 if (S_ISDIR(fattr->cf_mode)) { 773 pace = (struct smb_ace *)((char *)pndace + size); 774 775 /* creator owner */ 776 size += fill_ace_for_sid(pace, &creator_owner, ACCESS_ALLOWED, 777 0x0b, fattr->cf_mode, 0700); 778 pace = (struct smb_ace *)((char *)pndace + size); 779 780 /* creator group */ 781 size += fill_ace_for_sid(pace, &creator_group, ACCESS_ALLOWED, 782 0x0b, fattr->cf_mode, 0070); 783 pace = (struct smb_ace *)((char *)pndace + size); 784 num_aces = 5; 785 } 786 787 /* other */ 788 size += fill_ace_for_sid(pace, &sid_everyone, ACCESS_ALLOWED, 0, 789 fattr->cf_mode, 0007); 790 791 out: 792 pndacl->num_aces = cpu_to_le32(num_aces); 793 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); 794 } 795 796 static int parse_sid(struct smb_sid *psid, char *end_of_acl) 797 { 798 /* 799 * validate that we do not go past end of ACL - sid must be at least 8 800 * bytes long (assuming no sub-auths - e.g. the null SID 801 */ 802 if (end_of_acl < (char *)psid + 8) { 803 pr_err("ACL too small to parse SID %p\n", psid); 804 return -EINVAL; 805 } 806 807 return 0; 808 } 809 810 /* Convert CIFS ACL to POSIX form */ 811 int parse_sec_desc(struct mnt_idmap *idmap, struct smb_ntsd *pntsd, 812 int acl_len, struct smb_fattr *fattr) 813 { 814 int rc = 0; 815 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 816 struct smb_acl *dacl_ptr; /* no need for SACL ptr */ 817 char *end_of_acl = ((char *)pntsd) + acl_len; 818 __u32 dacloffset; 819 int pntsd_type; 820 821 if (!pntsd) 822 return -EIO; 823 824 if (acl_len < sizeof(struct smb_ntsd)) 825 return -EINVAL; 826 827 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + 828 le32_to_cpu(pntsd->osidoffset)); 829 group_sid_ptr = (struct smb_sid *)((char *)pntsd + 830 le32_to_cpu(pntsd->gsidoffset)); 831 dacloffset = le32_to_cpu(pntsd->dacloffset); 832 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset); 833 ksmbd_debug(SMB, 834 "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", 835 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), 836 le32_to_cpu(pntsd->gsidoffset), 837 le32_to_cpu(pntsd->sacloffset), dacloffset); 838 839 pntsd_type = le16_to_cpu(pntsd->type); 840 if (!(pntsd_type & DACL_PRESENT)) { 841 ksmbd_debug(SMB, "DACL_PRESENT in DACL type is not set\n"); 842 return rc; 843 } 844 845 pntsd->type = cpu_to_le16(DACL_PRESENT); 846 847 if (pntsd->osidoffset) { 848 rc = parse_sid(owner_sid_ptr, end_of_acl); 849 if (rc) { 850 pr_err("%s: Error %d parsing Owner SID\n", __func__, rc); 851 return rc; 852 } 853 854 rc = sid_to_id(idmap, owner_sid_ptr, SIDOWNER, fattr); 855 if (rc) { 856 pr_err("%s: Error %d mapping Owner SID to uid\n", 857 __func__, rc); 858 owner_sid_ptr = NULL; 859 } 860 } 861 862 if (pntsd->gsidoffset) { 863 rc = parse_sid(group_sid_ptr, end_of_acl); 864 if (rc) { 865 pr_err("%s: Error %d mapping Owner SID to gid\n", 866 __func__, rc); 867 return rc; 868 } 869 rc = sid_to_id(idmap, group_sid_ptr, SIDUNIX_GROUP, fattr); 870 if (rc) { 871 pr_err("%s: Error %d mapping Group SID to gid\n", 872 __func__, rc); 873 group_sid_ptr = NULL; 874 } 875 } 876 877 if ((pntsd_type & (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) == 878 (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) 879 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED); 880 if (pntsd_type & DACL_PROTECTED) 881 pntsd->type |= cpu_to_le16(DACL_PROTECTED); 882 883 if (dacloffset) { 884 parse_dacl(idmap, dacl_ptr, end_of_acl, 885 owner_sid_ptr, group_sid_ptr, fattr); 886 } 887 888 return 0; 889 } 890 891 /* Convert permission bits from mode to equivalent CIFS ACL */ 892 int build_sec_desc(struct mnt_idmap *idmap, 893 struct smb_ntsd *pntsd, struct smb_ntsd *ppntsd, 894 int ppntsd_size, int addition_info, __u32 *secdesclen, 895 struct smb_fattr *fattr) 896 { 897 int rc = 0; 898 __u32 offset; 899 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 900 struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr; 901 struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */ 902 uid_t uid; 903 gid_t gid; 904 unsigned int sid_type = SIDOWNER; 905 906 nowner_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL); 907 if (!nowner_sid_ptr) 908 return -ENOMEM; 909 910 uid = from_kuid(&init_user_ns, fattr->cf_uid); 911 if (!uid) 912 sid_type = SIDUNIX_USER; 913 id_to_sid(uid, sid_type, nowner_sid_ptr); 914 915 ngroup_sid_ptr = kmalloc(sizeof(struct smb_sid), GFP_KERNEL); 916 if (!ngroup_sid_ptr) { 917 kfree(nowner_sid_ptr); 918 return -ENOMEM; 919 } 920 921 gid = from_kgid(&init_user_ns, fattr->cf_gid); 922 id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr); 923 924 offset = sizeof(struct smb_ntsd); 925 pntsd->sacloffset = 0; 926 pntsd->revision = cpu_to_le16(1); 927 pntsd->type = cpu_to_le16(SELF_RELATIVE); 928 if (ppntsd) 929 pntsd->type |= ppntsd->type; 930 931 if (addition_info & OWNER_SECINFO) { 932 pntsd->osidoffset = cpu_to_le32(offset); 933 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + offset); 934 smb_copy_sid(owner_sid_ptr, nowner_sid_ptr); 935 offset += 1 + 1 + 6 + (nowner_sid_ptr->num_subauth * 4); 936 } 937 938 if (addition_info & GROUP_SECINFO) { 939 pntsd->gsidoffset = cpu_to_le32(offset); 940 group_sid_ptr = (struct smb_sid *)((char *)pntsd + offset); 941 smb_copy_sid(group_sid_ptr, ngroup_sid_ptr); 942 offset += 1 + 1 + 6 + (ngroup_sid_ptr->num_subauth * 4); 943 } 944 945 if (addition_info & DACL_SECINFO) { 946 pntsd->type |= cpu_to_le16(DACL_PRESENT); 947 dacl_ptr = (struct smb_acl *)((char *)pntsd + offset); 948 dacl_ptr->revision = cpu_to_le16(2); 949 dacl_ptr->size = cpu_to_le16(sizeof(struct smb_acl)); 950 dacl_ptr->num_aces = 0; 951 952 if (!ppntsd) { 953 set_mode_dacl(idmap, dacl_ptr, fattr); 954 } else { 955 struct smb_acl *ppdacl_ptr; 956 unsigned int dacl_offset = le32_to_cpu(ppntsd->dacloffset); 957 int ppdacl_size, ntacl_size = ppntsd_size - dacl_offset; 958 959 if (!dacl_offset || 960 (dacl_offset + sizeof(struct smb_acl) > ppntsd_size)) 961 goto out; 962 963 ppdacl_ptr = (struct smb_acl *)((char *)ppntsd + dacl_offset); 964 ppdacl_size = le16_to_cpu(ppdacl_ptr->size); 965 if (ppdacl_size > ntacl_size || 966 ppdacl_size < sizeof(struct smb_acl)) 967 goto out; 968 969 set_ntacl_dacl(idmap, dacl_ptr, ppdacl_ptr, 970 ntacl_size - sizeof(struct smb_acl), 971 nowner_sid_ptr, ngroup_sid_ptr, 972 fattr); 973 } 974 pntsd->dacloffset = cpu_to_le32(offset); 975 offset += le16_to_cpu(dacl_ptr->size); 976 } 977 978 out: 979 kfree(nowner_sid_ptr); 980 kfree(ngroup_sid_ptr); 981 *secdesclen = offset; 982 return rc; 983 } 984 985 static void smb_set_ace(struct smb_ace *ace, const struct smb_sid *sid, u8 type, 986 u8 flags, __le32 access_req) 987 { 988 ace->type = type; 989 ace->flags = flags; 990 ace->access_req = access_req; 991 smb_copy_sid(&ace->sid, sid); 992 ace->size = cpu_to_le16(1 + 1 + 2 + 4 + 1 + 1 + 6 + (sid->num_subauth * 4)); 993 } 994 995 int smb_inherit_dacl(struct ksmbd_conn *conn, 996 const struct path *path, 997 unsigned int uid, unsigned int gid) 998 { 999 const struct smb_sid *psid, *creator = NULL; 1000 struct smb_ace *parent_aces, *aces; 1001 struct smb_acl *parent_pdacl; 1002 struct smb_ntsd *parent_pntsd = NULL; 1003 struct smb_sid owner_sid, group_sid; 1004 struct dentry *parent = path->dentry->d_parent; 1005 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1006 int inherited_flags = 0, flags = 0, i, ace_cnt = 0, nt_size = 0, pdacl_size; 1007 int rc = 0, num_aces, dacloffset, pntsd_type, pntsd_size, acl_len, aces_size; 1008 char *aces_base; 1009 bool is_dir = S_ISDIR(d_inode(path->dentry)->i_mode); 1010 1011 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap, 1012 parent, &parent_pntsd); 1013 if (pntsd_size <= 0) 1014 return -ENOENT; 1015 dacloffset = le32_to_cpu(parent_pntsd->dacloffset); 1016 if (!dacloffset || (dacloffset + sizeof(struct smb_acl) > pntsd_size)) { 1017 rc = -EINVAL; 1018 goto free_parent_pntsd; 1019 } 1020 1021 parent_pdacl = (struct smb_acl *)((char *)parent_pntsd + dacloffset); 1022 acl_len = pntsd_size - dacloffset; 1023 num_aces = le32_to_cpu(parent_pdacl->num_aces); 1024 pntsd_type = le16_to_cpu(parent_pntsd->type); 1025 pdacl_size = le16_to_cpu(parent_pdacl->size); 1026 1027 if (pdacl_size > acl_len || pdacl_size < sizeof(struct smb_acl)) { 1028 rc = -EINVAL; 1029 goto free_parent_pntsd; 1030 } 1031 1032 aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, GFP_KERNEL); 1033 if (!aces_base) { 1034 rc = -ENOMEM; 1035 goto free_parent_pntsd; 1036 } 1037 1038 aces = (struct smb_ace *)aces_base; 1039 parent_aces = (struct smb_ace *)((char *)parent_pdacl + 1040 sizeof(struct smb_acl)); 1041 aces_size = acl_len - sizeof(struct smb_acl); 1042 1043 if (pntsd_type & DACL_AUTO_INHERITED) 1044 inherited_flags = INHERITED_ACE; 1045 1046 for (i = 0; i < num_aces; i++) { 1047 int pace_size; 1048 1049 if (offsetof(struct smb_ace, access_req) > aces_size) 1050 break; 1051 1052 pace_size = le16_to_cpu(parent_aces->size); 1053 if (pace_size > aces_size) 1054 break; 1055 1056 aces_size -= pace_size; 1057 1058 flags = parent_aces->flags; 1059 if (!smb_inherit_flags(flags, is_dir)) 1060 goto pass; 1061 if (is_dir) { 1062 flags &= ~(INHERIT_ONLY_ACE | INHERITED_ACE); 1063 if (!(flags & CONTAINER_INHERIT_ACE)) 1064 flags |= INHERIT_ONLY_ACE; 1065 if (flags & NO_PROPAGATE_INHERIT_ACE) 1066 flags = 0; 1067 } else { 1068 flags = 0; 1069 } 1070 1071 if (!compare_sids(&creator_owner, &parent_aces->sid)) { 1072 creator = &creator_owner; 1073 id_to_sid(uid, SIDOWNER, &owner_sid); 1074 psid = &owner_sid; 1075 } else if (!compare_sids(&creator_group, &parent_aces->sid)) { 1076 creator = &creator_group; 1077 id_to_sid(gid, SIDUNIX_GROUP, &group_sid); 1078 psid = &group_sid; 1079 } else { 1080 creator = NULL; 1081 psid = &parent_aces->sid; 1082 } 1083 1084 if (is_dir && creator && flags & CONTAINER_INHERIT_ACE) { 1085 smb_set_ace(aces, psid, parent_aces->type, inherited_flags, 1086 parent_aces->access_req); 1087 nt_size += le16_to_cpu(aces->size); 1088 ace_cnt++; 1089 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size)); 1090 flags |= INHERIT_ONLY_ACE; 1091 psid = creator; 1092 } else if (is_dir && !(parent_aces->flags & NO_PROPAGATE_INHERIT_ACE)) { 1093 psid = &parent_aces->sid; 1094 } 1095 1096 smb_set_ace(aces, psid, parent_aces->type, flags | inherited_flags, 1097 parent_aces->access_req); 1098 nt_size += le16_to_cpu(aces->size); 1099 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size)); 1100 ace_cnt++; 1101 pass: 1102 parent_aces = (struct smb_ace *)((char *)parent_aces + pace_size); 1103 } 1104 1105 if (nt_size > 0) { 1106 struct smb_ntsd *pntsd; 1107 struct smb_acl *pdacl; 1108 struct smb_sid *powner_sid = NULL, *pgroup_sid = NULL; 1109 int powner_sid_size = 0, pgroup_sid_size = 0, pntsd_size; 1110 int pntsd_alloc_size; 1111 1112 if (parent_pntsd->osidoffset) { 1113 powner_sid = (struct smb_sid *)((char *)parent_pntsd + 1114 le32_to_cpu(parent_pntsd->osidoffset)); 1115 powner_sid_size = 1 + 1 + 6 + (powner_sid->num_subauth * 4); 1116 } 1117 if (parent_pntsd->gsidoffset) { 1118 pgroup_sid = (struct smb_sid *)((char *)parent_pntsd + 1119 le32_to_cpu(parent_pntsd->gsidoffset)); 1120 pgroup_sid_size = 1 + 1 + 6 + (pgroup_sid->num_subauth * 4); 1121 } 1122 1123 pntsd_alloc_size = sizeof(struct smb_ntsd) + powner_sid_size + 1124 pgroup_sid_size + sizeof(struct smb_acl) + nt_size; 1125 1126 pntsd = kzalloc(pntsd_alloc_size, GFP_KERNEL); 1127 if (!pntsd) { 1128 rc = -ENOMEM; 1129 goto free_aces_base; 1130 } 1131 1132 pntsd->revision = cpu_to_le16(1); 1133 pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PRESENT); 1134 if (le16_to_cpu(parent_pntsd->type) & DACL_AUTO_INHERITED) 1135 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED); 1136 pntsd_size = sizeof(struct smb_ntsd); 1137 pntsd->osidoffset = parent_pntsd->osidoffset; 1138 pntsd->gsidoffset = parent_pntsd->gsidoffset; 1139 pntsd->dacloffset = parent_pntsd->dacloffset; 1140 1141 if ((u64)le32_to_cpu(pntsd->osidoffset) + powner_sid_size > 1142 pntsd_alloc_size) { 1143 rc = -EINVAL; 1144 kfree(pntsd); 1145 goto free_aces_base; 1146 } 1147 1148 if ((u64)le32_to_cpu(pntsd->gsidoffset) + pgroup_sid_size > 1149 pntsd_alloc_size) { 1150 rc = -EINVAL; 1151 kfree(pntsd); 1152 goto free_aces_base; 1153 } 1154 1155 if ((u64)le32_to_cpu(pntsd->dacloffset) + sizeof(struct smb_acl) + nt_size > 1156 pntsd_alloc_size) { 1157 rc = -EINVAL; 1158 kfree(pntsd); 1159 goto free_aces_base; 1160 } 1161 1162 if (pntsd->osidoffset) { 1163 struct smb_sid *owner_sid = (struct smb_sid *)((char *)pntsd + 1164 le32_to_cpu(pntsd->osidoffset)); 1165 memcpy(owner_sid, powner_sid, powner_sid_size); 1166 pntsd_size += powner_sid_size; 1167 } 1168 1169 if (pntsd->gsidoffset) { 1170 struct smb_sid *group_sid = (struct smb_sid *)((char *)pntsd + 1171 le32_to_cpu(pntsd->gsidoffset)); 1172 memcpy(group_sid, pgroup_sid, pgroup_sid_size); 1173 pntsd_size += pgroup_sid_size; 1174 } 1175 1176 if (pntsd->dacloffset) { 1177 struct smb_ace *pace; 1178 1179 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset)); 1180 pdacl->revision = cpu_to_le16(2); 1181 pdacl->size = cpu_to_le16(sizeof(struct smb_acl) + nt_size); 1182 pdacl->num_aces = cpu_to_le32(ace_cnt); 1183 pace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1184 memcpy(pace, aces_base, nt_size); 1185 pntsd_size += sizeof(struct smb_acl) + nt_size; 1186 } 1187 1188 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, pntsd_size); 1189 kfree(pntsd); 1190 } 1191 1192 free_aces_base: 1193 kfree(aces_base); 1194 free_parent_pntsd: 1195 kfree(parent_pntsd); 1196 return rc; 1197 } 1198 1199 bool smb_inherit_flags(int flags, bool is_dir) 1200 { 1201 if (!is_dir) 1202 return (flags & OBJECT_INHERIT_ACE) != 0; 1203 1204 if (flags & OBJECT_INHERIT_ACE && !(flags & NO_PROPAGATE_INHERIT_ACE)) 1205 return true; 1206 1207 if (flags & CONTAINER_INHERIT_ACE) 1208 return true; 1209 return false; 1210 } 1211 1212 int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path, 1213 __le32 *pdaccess, int uid) 1214 { 1215 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1216 struct smb_ntsd *pntsd = NULL; 1217 struct smb_acl *pdacl; 1218 struct posix_acl *posix_acls; 1219 int rc = 0, pntsd_size, acl_size, aces_size, pdacl_size, dacl_offset; 1220 struct smb_sid sid; 1221 int granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE); 1222 struct smb_ace *ace; 1223 int i, found = 0; 1224 unsigned int access_bits = 0; 1225 struct smb_ace *others_ace = NULL; 1226 struct posix_acl_entry *pa_entry; 1227 unsigned int sid_type = SIDOWNER; 1228 unsigned short ace_size; 1229 1230 ksmbd_debug(SMB, "check permission using windows acl\n"); 1231 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap, 1232 path->dentry, &pntsd); 1233 if (pntsd_size <= 0 || !pntsd) 1234 goto err_out; 1235 1236 dacl_offset = le32_to_cpu(pntsd->dacloffset); 1237 if (!dacl_offset || 1238 (dacl_offset + sizeof(struct smb_acl) > pntsd_size)) 1239 goto err_out; 1240 1241 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset)); 1242 acl_size = pntsd_size - dacl_offset; 1243 pdacl_size = le16_to_cpu(pdacl->size); 1244 1245 if (pdacl_size > acl_size || pdacl_size < sizeof(struct smb_acl)) 1246 goto err_out; 1247 1248 if (!pdacl->num_aces) { 1249 if (!(pdacl_size - sizeof(struct smb_acl)) && 1250 *pdaccess & ~(FILE_READ_CONTROL_LE | FILE_WRITE_DAC_LE)) { 1251 rc = -EACCES; 1252 goto err_out; 1253 } 1254 goto err_out; 1255 } 1256 1257 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE) { 1258 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES | 1259 DELETE; 1260 1261 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1262 aces_size = acl_size - sizeof(struct smb_acl); 1263 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) { 1264 if (offsetof(struct smb_ace, access_req) > aces_size) 1265 break; 1266 ace_size = le16_to_cpu(ace->size); 1267 if (ace_size > aces_size) 1268 break; 1269 aces_size -= ace_size; 1270 granted |= le32_to_cpu(ace->access_req); 1271 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size)); 1272 } 1273 1274 if (!pdacl->num_aces) 1275 granted = GENERIC_ALL_FLAGS; 1276 } 1277 1278 if (!uid) 1279 sid_type = SIDUNIX_USER; 1280 id_to_sid(uid, sid_type, &sid); 1281 1282 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1283 aces_size = acl_size - sizeof(struct smb_acl); 1284 for (i = 0; i < le32_to_cpu(pdacl->num_aces); i++) { 1285 if (offsetof(struct smb_ace, access_req) > aces_size) 1286 break; 1287 ace_size = le16_to_cpu(ace->size); 1288 if (ace_size > aces_size) 1289 break; 1290 aces_size -= ace_size; 1291 1292 if (!compare_sids(&sid, &ace->sid) || 1293 !compare_sids(&sid_unix_NFS_mode, &ace->sid)) { 1294 found = 1; 1295 break; 1296 } 1297 if (!compare_sids(&sid_everyone, &ace->sid)) 1298 others_ace = ace; 1299 1300 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size)); 1301 } 1302 1303 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE && found) { 1304 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES | 1305 DELETE; 1306 1307 granted |= le32_to_cpu(ace->access_req); 1308 1309 if (!pdacl->num_aces) 1310 granted = GENERIC_ALL_FLAGS; 1311 } 1312 1313 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 1314 posix_acls = get_inode_acl(d_inode(path->dentry), ACL_TYPE_ACCESS); 1315 if (!IS_ERR_OR_NULL(posix_acls) && !found) { 1316 unsigned int id = -1; 1317 1318 pa_entry = posix_acls->a_entries; 1319 for (i = 0; i < posix_acls->a_count; i++, pa_entry++) { 1320 if (pa_entry->e_tag == ACL_USER) 1321 id = posix_acl_uid_translate(idmap, pa_entry); 1322 else if (pa_entry->e_tag == ACL_GROUP) 1323 id = posix_acl_gid_translate(idmap, pa_entry); 1324 else 1325 continue; 1326 1327 if (id == uid) { 1328 mode_to_access_flags(pa_entry->e_perm, 1329 0777, 1330 &access_bits); 1331 if (!access_bits) 1332 access_bits = 1333 SET_MINIMUM_RIGHTS; 1334 posix_acl_release(posix_acls); 1335 goto check_access_bits; 1336 } 1337 } 1338 } 1339 if (!IS_ERR_OR_NULL(posix_acls)) 1340 posix_acl_release(posix_acls); 1341 } 1342 1343 if (!found) { 1344 if (others_ace) { 1345 ace = others_ace; 1346 } else { 1347 ksmbd_debug(SMB, "Can't find corresponding sid\n"); 1348 rc = -EACCES; 1349 goto err_out; 1350 } 1351 } 1352 1353 switch (ace->type) { 1354 case ACCESS_ALLOWED_ACE_TYPE: 1355 access_bits = le32_to_cpu(ace->access_req); 1356 break; 1357 case ACCESS_DENIED_ACE_TYPE: 1358 case ACCESS_DENIED_CALLBACK_ACE_TYPE: 1359 access_bits = le32_to_cpu(~ace->access_req); 1360 break; 1361 } 1362 1363 check_access_bits: 1364 if (granted & 1365 ~(access_bits | FILE_READ_ATTRIBUTES | READ_CONTROL | WRITE_DAC | DELETE)) { 1366 ksmbd_debug(SMB, "Access denied with winACL, granted : %x, access_req : %x\n", 1367 granted, le32_to_cpu(ace->access_req)); 1368 rc = -EACCES; 1369 goto err_out; 1370 } 1371 1372 *pdaccess = cpu_to_le32(granted); 1373 err_out: 1374 kfree(pntsd); 1375 return rc; 1376 } 1377 1378 int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon, 1379 const struct path *path, struct smb_ntsd *pntsd, int ntsd_len, 1380 bool type_check) 1381 { 1382 int rc; 1383 struct smb_fattr fattr = {{0}}; 1384 struct inode *inode = d_inode(path->dentry); 1385 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1386 struct iattr newattrs; 1387 1388 fattr.cf_uid = INVALID_UID; 1389 fattr.cf_gid = INVALID_GID; 1390 fattr.cf_mode = inode->i_mode; 1391 1392 rc = parse_sec_desc(idmap, pntsd, ntsd_len, &fattr); 1393 if (rc) 1394 goto out; 1395 1396 newattrs.ia_valid = ATTR_CTIME; 1397 if (!uid_eq(fattr.cf_uid, INVALID_UID)) { 1398 newattrs.ia_valid |= ATTR_UID; 1399 newattrs.ia_uid = fattr.cf_uid; 1400 } 1401 if (!gid_eq(fattr.cf_gid, INVALID_GID)) { 1402 newattrs.ia_valid |= ATTR_GID; 1403 newattrs.ia_gid = fattr.cf_gid; 1404 } 1405 newattrs.ia_valid |= ATTR_MODE; 1406 newattrs.ia_mode = (inode->i_mode & ~0777) | (fattr.cf_mode & 0777); 1407 1408 ksmbd_vfs_remove_acl_xattrs(idmap, path); 1409 /* Update posix acls */ 1410 if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) { 1411 rc = set_posix_acl(idmap, path->dentry, 1412 ACL_TYPE_ACCESS, fattr.cf_acls); 1413 if (rc < 0) 1414 ksmbd_debug(SMB, 1415 "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1416 rc); 1417 if (S_ISDIR(inode->i_mode) && fattr.cf_dacls) { 1418 rc = set_posix_acl(idmap, path->dentry, 1419 ACL_TYPE_DEFAULT, fattr.cf_dacls); 1420 if (rc) 1421 ksmbd_debug(SMB, 1422 "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1423 rc); 1424 } 1425 } 1426 1427 inode_lock(inode); 1428 rc = notify_change(idmap, path->dentry, &newattrs, NULL); 1429 inode_unlock(inode); 1430 if (rc) 1431 goto out; 1432 1433 /* Check it only calling from SD BUFFER context */ 1434 if (type_check && !(le16_to_cpu(pntsd->type) & DACL_PRESENT)) 1435 goto out; 1436 1437 if (test_share_config_flag(tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) { 1438 /* Update WinACL in xattr */ 1439 ksmbd_vfs_remove_sd_xattrs(idmap, path); 1440 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, ntsd_len); 1441 } 1442 1443 out: 1444 posix_acl_release(fattr.cf_acls); 1445 posix_acl_release(fattr.cf_dacls); 1446 return rc; 1447 } 1448 1449 void ksmbd_init_domain(u32 *sub_auth) 1450 { 1451 int i; 1452 1453 memcpy(&server_conf.domain_sid, &domain, sizeof(struct smb_sid)); 1454 for (i = 0; i < 3; ++i) 1455 server_conf.domain_sid.sub_auth[i + 1] = cpu_to_le32(sub_auth[i]); 1456 } 1457