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, u16 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, KSMBD_DEFAULT_GFP); 349 if (!state->users) 350 return -ENOMEM; 351 state->groups = kzalloc(alloc, KSMBD_DEFAULT_GFP); 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 u16 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 le16_to_cpu(pdacl->num_aces)); 393 394 acl_base = (char *)pdacl; 395 acl_size = sizeof(struct smb_acl); 396 397 num_aces = le16_to_cpu(pdacl->num_aces); 398 if (num_aces <= 0) 399 return; 400 401 if (num_aces > (le16_to_cpu(pdacl->size) - sizeof(struct smb_acl)) / 402 (offsetof(struct smb_ace, sid) + 403 offsetof(struct smb_sid, sub_auth) + sizeof(__le16))) 404 return; 405 406 ret = init_acl_state(&acl_state, num_aces); 407 if (ret) 408 return; 409 ret = init_acl_state(&default_acl_state, num_aces); 410 if (ret) { 411 free_acl_state(&acl_state); 412 return; 413 } 414 415 ppace = kmalloc_array(num_aces, sizeof(struct smb_ace *), KSMBD_DEFAULT_GFP); 416 if (!ppace) { 417 free_acl_state(&default_acl_state); 418 free_acl_state(&acl_state); 419 return; 420 } 421 422 /* 423 * reset rwx permissions for user/group/other. 424 * Also, if num_aces is 0 i.e. DACL has no ACEs, 425 * user/group/other have no permissions 426 */ 427 for (i = 0; i < num_aces; ++i) { 428 if (end_of_acl - acl_base < acl_size) 429 break; 430 431 ppace[i] = (struct smb_ace *)(acl_base + acl_size); 432 acl_base = (char *)ppace[i]; 433 acl_size = offsetof(struct smb_ace, sid) + 434 offsetof(struct smb_sid, sub_auth); 435 436 if (end_of_acl - acl_base < acl_size || 437 ppace[i]->sid.num_subauth == 0 || 438 ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES || 439 (end_of_acl - acl_base < 440 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) || 441 (le16_to_cpu(ppace[i]->size) < 442 acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth)) 443 break; 444 445 acl_size = le16_to_cpu(ppace[i]->size); 446 ppace[i]->access_req = 447 smb_map_generic_desired_access(ppace[i]->access_req); 448 449 if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) { 450 fattr->cf_mode = 451 le32_to_cpu(ppace[i]->sid.sub_auth[2]); 452 break; 453 } else if (!compare_sids(&ppace[i]->sid, pownersid)) { 454 acl_mode = access_flags_to_mode(fattr, 455 ppace[i]->access_req, 456 ppace[i]->type); 457 acl_mode &= 0700; 458 459 if (!owner_found) { 460 mode &= ~(0700); 461 mode |= acl_mode; 462 } 463 owner_found = true; 464 } else if (!compare_sids(&ppace[i]->sid, pgrpsid) || 465 ppace[i]->sid.sub_auth[ppace[i]->sid.num_subauth - 1] == 466 DOMAIN_USER_RID_LE) { 467 acl_mode = access_flags_to_mode(fattr, 468 ppace[i]->access_req, 469 ppace[i]->type); 470 acl_mode &= 0070; 471 if (!group_found) { 472 mode &= ~(0070); 473 mode |= acl_mode; 474 } 475 group_found = true; 476 } else if (!compare_sids(&ppace[i]->sid, &sid_everyone)) { 477 acl_mode = access_flags_to_mode(fattr, 478 ppace[i]->access_req, 479 ppace[i]->type); 480 acl_mode &= 0007; 481 if (!others_found) { 482 mode &= ~(0007); 483 mode |= acl_mode; 484 } 485 others_found = true; 486 } else if (!compare_sids(&ppace[i]->sid, &creator_owner)) { 487 continue; 488 } else if (!compare_sids(&ppace[i]->sid, &creator_group)) { 489 continue; 490 } else if (!compare_sids(&ppace[i]->sid, &sid_authusers)) { 491 continue; 492 } else { 493 struct smb_fattr temp_fattr; 494 495 acl_mode = access_flags_to_mode(fattr, ppace[i]->access_req, 496 ppace[i]->type); 497 temp_fattr.cf_uid = INVALID_UID; 498 ret = sid_to_id(idmap, &ppace[i]->sid, SIDOWNER, &temp_fattr); 499 if (ret || uid_eq(temp_fattr.cf_uid, INVALID_UID)) { 500 pr_err("%s: Error %d mapping Owner SID to uid\n", 501 __func__, ret); 502 continue; 503 } 504 505 acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004; 506 acl_state.users->aces[acl_state.users->n].uid = 507 temp_fattr.cf_uid; 508 acl_state.users->aces[acl_state.users->n++].perms.allow = 509 ((acl_mode & 0700) >> 6) | 0004; 510 default_acl_state.owner.allow = ((acl_mode & 0700) >> 6) | 0004; 511 default_acl_state.users->aces[default_acl_state.users->n].uid = 512 temp_fattr.cf_uid; 513 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow = 514 ((acl_mode & 0700) >> 6) | 0004; 515 } 516 } 517 kfree(ppace); 518 519 if (owner_found) { 520 /* The owner must be set to at least read-only. */ 521 acl_state.owner.allow = ((mode & 0700) >> 6) | 0004; 522 acl_state.users->aces[acl_state.users->n].uid = fattr->cf_uid; 523 acl_state.users->aces[acl_state.users->n++].perms.allow = 524 ((mode & 0700) >> 6) | 0004; 525 default_acl_state.owner.allow = ((mode & 0700) >> 6) | 0004; 526 default_acl_state.users->aces[default_acl_state.users->n].uid = 527 fattr->cf_uid; 528 default_acl_state.users->aces[default_acl_state.users->n++].perms.allow = 529 ((mode & 0700) >> 6) | 0004; 530 } 531 532 if (group_found) { 533 acl_state.group.allow = (mode & 0070) >> 3; 534 acl_state.groups->aces[acl_state.groups->n].gid = 535 fattr->cf_gid; 536 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 537 (mode & 0070) >> 3; 538 default_acl_state.group.allow = (mode & 0070) >> 3; 539 default_acl_state.groups->aces[default_acl_state.groups->n].gid = 540 fattr->cf_gid; 541 default_acl_state.groups->aces[default_acl_state.groups->n++].perms.allow = 542 (mode & 0070) >> 3; 543 } 544 545 if (others_found) { 546 fattr->cf_mode &= ~(0007); 547 fattr->cf_mode |= mode & 0007; 548 549 acl_state.other.allow = mode & 0007; 550 default_acl_state.other.allow = mode & 0007; 551 } 552 553 if (acl_state.users->n || acl_state.groups->n) { 554 acl_state.mask.allow = 0x07; 555 556 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 557 fattr->cf_acls = 558 posix_acl_alloc(acl_state.users->n + 559 acl_state.groups->n + 4, KSMBD_DEFAULT_GFP); 560 if (fattr->cf_acls) { 561 cf_pace = fattr->cf_acls->a_entries; 562 posix_state_to_acl(&acl_state, cf_pace); 563 } 564 } 565 } 566 567 if (default_acl_state.users->n || default_acl_state.groups->n) { 568 default_acl_state.mask.allow = 0x07; 569 570 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 571 fattr->cf_dacls = 572 posix_acl_alloc(default_acl_state.users->n + 573 default_acl_state.groups->n + 4, KSMBD_DEFAULT_GFP); 574 if (fattr->cf_dacls) { 575 cf_pdace = fattr->cf_dacls->a_entries; 576 posix_state_to_acl(&default_acl_state, cf_pdace); 577 } 578 } 579 } 580 free_acl_state(&acl_state); 581 free_acl_state(&default_acl_state); 582 } 583 584 static void set_posix_acl_entries_dacl(struct mnt_idmap *idmap, 585 struct smb_ace *pndace, 586 struct smb_fattr *fattr, u16 *num_aces, 587 u16 *size, u32 nt_aces_num) 588 { 589 struct posix_acl_entry *pace; 590 struct smb_sid *sid; 591 struct smb_ace *ntace; 592 int i, j; 593 594 if (!fattr->cf_acls) 595 goto posix_default_acl; 596 597 pace = fattr->cf_acls->a_entries; 598 for (i = 0; i < fattr->cf_acls->a_count; i++, pace++) { 599 int flags = 0; 600 601 sid = kmalloc(sizeof(struct smb_sid), KSMBD_DEFAULT_GFP); 602 if (!sid) 603 break; 604 605 if (pace->e_tag == ACL_USER) { 606 uid_t uid; 607 unsigned int sid_type = SIDOWNER; 608 609 uid = posix_acl_uid_translate(idmap, pace); 610 if (!uid) 611 sid_type = SIDUNIX_USER; 612 id_to_sid(uid, sid_type, sid); 613 } else if (pace->e_tag == ACL_GROUP) { 614 gid_t gid; 615 616 gid = posix_acl_gid_translate(idmap, pace); 617 id_to_sid(gid, SIDUNIX_GROUP, sid); 618 } else if (pace->e_tag == ACL_OTHER && !nt_aces_num) { 619 smb_copy_sid(sid, &sid_everyone); 620 } else { 621 kfree(sid); 622 continue; 623 } 624 ntace = pndace; 625 for (j = 0; j < nt_aces_num; j++) { 626 if (ntace->sid.sub_auth[ntace->sid.num_subauth - 1] == 627 sid->sub_auth[sid->num_subauth - 1]) 628 goto pass_same_sid; 629 ntace = (struct smb_ace *)((char *)ntace + 630 le16_to_cpu(ntace->size)); 631 } 632 633 if (S_ISDIR(fattr->cf_mode) && pace->e_tag == ACL_OTHER) 634 flags = 0x03; 635 636 ntace = (struct smb_ace *)((char *)pndace + *size); 637 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags, 638 pace->e_perm, 0777); 639 (*num_aces)++; 640 if (pace->e_tag == ACL_USER) 641 ntace->access_req |= 642 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 643 644 if (S_ISDIR(fattr->cf_mode) && 645 (pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) { 646 ntace = (struct smb_ace *)((char *)pndace + *size); 647 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 648 0x03, pace->e_perm, 0777); 649 (*num_aces)++; 650 if (pace->e_tag == ACL_USER) 651 ntace->access_req |= 652 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 653 } 654 655 pass_same_sid: 656 kfree(sid); 657 } 658 659 if (nt_aces_num) 660 return; 661 662 posix_default_acl: 663 if (!fattr->cf_dacls) 664 return; 665 666 pace = fattr->cf_dacls->a_entries; 667 for (i = 0; i < fattr->cf_dacls->a_count; i++, pace++) { 668 sid = kmalloc(sizeof(struct smb_sid), KSMBD_DEFAULT_GFP); 669 if (!sid) 670 break; 671 672 if (pace->e_tag == ACL_USER) { 673 uid_t uid; 674 675 uid = posix_acl_uid_translate(idmap, pace); 676 id_to_sid(uid, SIDCREATOR_OWNER, sid); 677 } else if (pace->e_tag == ACL_GROUP) { 678 gid_t gid; 679 680 gid = posix_acl_gid_translate(idmap, pace); 681 id_to_sid(gid, SIDCREATOR_GROUP, sid); 682 } else { 683 kfree(sid); 684 continue; 685 } 686 687 ntace = (struct smb_ace *)((char *)pndace + *size); 688 *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b, 689 pace->e_perm, 0777); 690 (*num_aces)++; 691 if (pace->e_tag == ACL_USER) 692 ntace->access_req |= 693 FILE_DELETE_LE | FILE_DELETE_CHILD_LE; 694 kfree(sid); 695 } 696 } 697 698 static void set_ntacl_dacl(struct mnt_idmap *idmap, 699 struct smb_acl *pndacl, 700 struct smb_acl *nt_dacl, 701 unsigned int aces_size, 702 const struct smb_sid *pownersid, 703 const struct smb_sid *pgrpsid, 704 struct smb_fattr *fattr) 705 { 706 struct smb_ace *ntace, *pndace; 707 u16 nt_num_aces = le16_to_cpu(nt_dacl->num_aces), num_aces = 0; 708 unsigned short size = 0; 709 int i; 710 711 pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl)); 712 if (nt_num_aces) { 713 ntace = (struct smb_ace *)((char *)nt_dacl + sizeof(struct smb_acl)); 714 for (i = 0; i < nt_num_aces; i++) { 715 unsigned short nt_ace_size; 716 717 if (offsetof(struct smb_ace, access_req) > aces_size) 718 break; 719 720 nt_ace_size = le16_to_cpu(ntace->size); 721 if (nt_ace_size > aces_size) 722 break; 723 724 memcpy((char *)pndace + size, ntace, nt_ace_size); 725 size += nt_ace_size; 726 aces_size -= nt_ace_size; 727 ntace = (struct smb_ace *)((char *)ntace + nt_ace_size); 728 num_aces++; 729 } 730 } 731 732 set_posix_acl_entries_dacl(idmap, pndace, fattr, 733 &num_aces, &size, nt_num_aces); 734 pndacl->num_aces = cpu_to_le16(num_aces); 735 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); 736 } 737 738 static void set_mode_dacl(struct mnt_idmap *idmap, 739 struct smb_acl *pndacl, struct smb_fattr *fattr) 740 { 741 struct smb_ace *pace, *pndace; 742 u16 num_aces = 0; 743 u16 size = 0, ace_size = 0; 744 uid_t uid; 745 const struct smb_sid *sid; 746 747 pace = pndace = (struct smb_ace *)((char *)pndacl + sizeof(struct smb_acl)); 748 749 if (fattr->cf_acls) { 750 set_posix_acl_entries_dacl(idmap, pndace, fattr, 751 &num_aces, &size, num_aces); 752 goto out; 753 } 754 755 /* owner RID */ 756 uid = from_kuid(&init_user_ns, fattr->cf_uid); 757 if (uid) 758 sid = &server_conf.domain_sid; 759 else 760 sid = &sid_unix_users; 761 ace_size = fill_ace_for_sid(pace, sid, ACCESS_ALLOWED, 0, 762 fattr->cf_mode, 0700); 763 pace->sid.sub_auth[pace->sid.num_subauth++] = cpu_to_le32(uid); 764 pace->size = cpu_to_le16(ace_size + 4); 765 size += le16_to_cpu(pace->size); 766 pace = (struct smb_ace *)((char *)pndace + size); 767 768 /* Group RID */ 769 ace_size = fill_ace_for_sid(pace, &sid_unix_groups, 770 ACCESS_ALLOWED, 0, fattr->cf_mode, 0070); 771 pace->sid.sub_auth[pace->sid.num_subauth++] = 772 cpu_to_le32(from_kgid(&init_user_ns, fattr->cf_gid)); 773 pace->size = cpu_to_le16(ace_size + 4); 774 size += le16_to_cpu(pace->size); 775 pace = (struct smb_ace *)((char *)pndace + size); 776 num_aces = 3; 777 778 if (S_ISDIR(fattr->cf_mode)) { 779 pace = (struct smb_ace *)((char *)pndace + size); 780 781 /* creator owner */ 782 size += fill_ace_for_sid(pace, &creator_owner, ACCESS_ALLOWED, 783 0x0b, fattr->cf_mode, 0700); 784 pace = (struct smb_ace *)((char *)pndace + size); 785 786 /* creator group */ 787 size += fill_ace_for_sid(pace, &creator_group, ACCESS_ALLOWED, 788 0x0b, fattr->cf_mode, 0070); 789 pace = (struct smb_ace *)((char *)pndace + size); 790 num_aces = 5; 791 } 792 793 /* other */ 794 size += fill_ace_for_sid(pace, &sid_everyone, ACCESS_ALLOWED, 0, 795 fattr->cf_mode, 0007); 796 797 out: 798 pndacl->num_aces = cpu_to_le16(num_aces); 799 pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); 800 } 801 802 static int parse_sid(struct smb_sid *psid, char *end_of_acl) 803 { 804 /* 805 * validate that we do not go past end of ACL - sid must be at least 8 806 * bytes long (assuming no sub-auths - e.g. the null SID 807 */ 808 if (end_of_acl < (char *)psid + 8) { 809 pr_err("ACL too small to parse SID %p\n", psid); 810 return -EINVAL; 811 } 812 813 if (!psid->num_subauth) 814 return 0; 815 816 if (psid->num_subauth > SID_MAX_SUB_AUTHORITIES || 817 end_of_acl < (char *)psid + 8 + sizeof(__le32) * psid->num_subauth) 818 return -EINVAL; 819 820 return 0; 821 } 822 823 /* Convert CIFS ACL to POSIX form */ 824 int parse_sec_desc(struct mnt_idmap *idmap, struct smb_ntsd *pntsd, 825 int acl_len, struct smb_fattr *fattr) 826 { 827 int rc = 0; 828 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 829 struct smb_acl *dacl_ptr; /* no need for SACL ptr */ 830 char *end_of_acl = ((char *)pntsd) + acl_len; 831 __u32 dacloffset; 832 int pntsd_type; 833 834 if (!pntsd) 835 return -EIO; 836 837 if (acl_len < sizeof(struct smb_ntsd)) 838 return -EINVAL; 839 840 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + 841 le32_to_cpu(pntsd->osidoffset)); 842 group_sid_ptr = (struct smb_sid *)((char *)pntsd + 843 le32_to_cpu(pntsd->gsidoffset)); 844 dacloffset = le32_to_cpu(pntsd->dacloffset); 845 dacl_ptr = (struct smb_acl *)((char *)pntsd + dacloffset); 846 ksmbd_debug(SMB, 847 "revision %d type 0x%x ooffset 0x%x goffset 0x%x sacloffset 0x%x dacloffset 0x%x\n", 848 pntsd->revision, pntsd->type, le32_to_cpu(pntsd->osidoffset), 849 le32_to_cpu(pntsd->gsidoffset), 850 le32_to_cpu(pntsd->sacloffset), dacloffset); 851 852 pntsd_type = le16_to_cpu(pntsd->type); 853 if (!(pntsd_type & DACL_PRESENT)) { 854 ksmbd_debug(SMB, "DACL_PRESENT in DACL type is not set\n"); 855 return rc; 856 } 857 858 pntsd->type = cpu_to_le16(DACL_PRESENT); 859 860 if (pntsd->osidoffset) { 861 if (le32_to_cpu(pntsd->osidoffset) < sizeof(struct smb_ntsd)) 862 return -EINVAL; 863 864 rc = parse_sid(owner_sid_ptr, end_of_acl); 865 if (rc) { 866 pr_err("%s: Error %d parsing Owner SID\n", __func__, rc); 867 return rc; 868 } 869 870 rc = sid_to_id(idmap, owner_sid_ptr, SIDOWNER, fattr); 871 if (rc) { 872 pr_err("%s: Error %d mapping Owner SID to uid\n", 873 __func__, rc); 874 owner_sid_ptr = NULL; 875 } 876 } 877 878 if (pntsd->gsidoffset) { 879 if (le32_to_cpu(pntsd->gsidoffset) < sizeof(struct smb_ntsd)) 880 return -EINVAL; 881 882 rc = parse_sid(group_sid_ptr, end_of_acl); 883 if (rc) { 884 pr_err("%s: Error %d mapping Owner SID to gid\n", 885 __func__, rc); 886 return rc; 887 } 888 rc = sid_to_id(idmap, group_sid_ptr, SIDUNIX_GROUP, fattr); 889 if (rc) { 890 pr_err("%s: Error %d mapping Group SID to gid\n", 891 __func__, rc); 892 group_sid_ptr = NULL; 893 } 894 } 895 896 if ((pntsd_type & (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) == 897 (DACL_AUTO_INHERITED | DACL_AUTO_INHERIT_REQ)) 898 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED); 899 if (pntsd_type & DACL_PROTECTED) 900 pntsd->type |= cpu_to_le16(DACL_PROTECTED); 901 902 if (dacloffset) { 903 if (dacloffset < sizeof(struct smb_ntsd)) 904 return -EINVAL; 905 906 parse_dacl(idmap, dacl_ptr, end_of_acl, 907 owner_sid_ptr, group_sid_ptr, fattr); 908 } 909 910 return 0; 911 } 912 913 /* Convert permission bits from mode to equivalent CIFS ACL */ 914 int build_sec_desc(struct mnt_idmap *idmap, 915 struct smb_ntsd *pntsd, struct smb_ntsd *ppntsd, 916 int ppntsd_size, int addition_info, __u32 *secdesclen, 917 struct smb_fattr *fattr) 918 { 919 int rc = 0; 920 __u32 offset; 921 struct smb_sid *owner_sid_ptr, *group_sid_ptr; 922 struct smb_sid *nowner_sid_ptr, *ngroup_sid_ptr; 923 struct smb_acl *dacl_ptr = NULL; /* no need for SACL ptr */ 924 uid_t uid; 925 gid_t gid; 926 unsigned int sid_type = SIDOWNER; 927 928 nowner_sid_ptr = kmalloc(sizeof(struct smb_sid), KSMBD_DEFAULT_GFP); 929 if (!nowner_sid_ptr) 930 return -ENOMEM; 931 932 uid = from_kuid(&init_user_ns, fattr->cf_uid); 933 if (!uid) 934 sid_type = SIDUNIX_USER; 935 id_to_sid(uid, sid_type, nowner_sid_ptr); 936 937 ngroup_sid_ptr = kmalloc(sizeof(struct smb_sid), KSMBD_DEFAULT_GFP); 938 if (!ngroup_sid_ptr) { 939 kfree(nowner_sid_ptr); 940 return -ENOMEM; 941 } 942 943 gid = from_kgid(&init_user_ns, fattr->cf_gid); 944 id_to_sid(gid, SIDUNIX_GROUP, ngroup_sid_ptr); 945 946 offset = sizeof(struct smb_ntsd); 947 pntsd->sacloffset = 0; 948 pntsd->revision = cpu_to_le16(1); 949 pntsd->type = cpu_to_le16(SELF_RELATIVE); 950 if (ppntsd) 951 pntsd->type |= ppntsd->type; 952 953 if (addition_info & OWNER_SECINFO) { 954 pntsd->osidoffset = cpu_to_le32(offset); 955 owner_sid_ptr = (struct smb_sid *)((char *)pntsd + offset); 956 smb_copy_sid(owner_sid_ptr, nowner_sid_ptr); 957 offset += 1 + 1 + 6 + (nowner_sid_ptr->num_subauth * 4); 958 } 959 960 if (addition_info & GROUP_SECINFO) { 961 pntsd->gsidoffset = cpu_to_le32(offset); 962 group_sid_ptr = (struct smb_sid *)((char *)pntsd + offset); 963 smb_copy_sid(group_sid_ptr, ngroup_sid_ptr); 964 offset += 1 + 1 + 6 + (ngroup_sid_ptr->num_subauth * 4); 965 } 966 967 if (addition_info & DACL_SECINFO) { 968 pntsd->type |= cpu_to_le16(DACL_PRESENT); 969 dacl_ptr = (struct smb_acl *)((char *)pntsd + offset); 970 dacl_ptr->revision = cpu_to_le16(2); 971 dacl_ptr->size = cpu_to_le16(sizeof(struct smb_acl)); 972 dacl_ptr->num_aces = 0; 973 974 if (!ppntsd) { 975 set_mode_dacl(idmap, dacl_ptr, fattr); 976 } else { 977 struct smb_acl *ppdacl_ptr; 978 unsigned int dacl_offset = le32_to_cpu(ppntsd->dacloffset); 979 int ppdacl_size, ntacl_size = ppntsd_size - dacl_offset; 980 981 if (!dacl_offset || 982 (dacl_offset + sizeof(struct smb_acl) > ppntsd_size)) 983 goto out; 984 985 ppdacl_ptr = (struct smb_acl *)((char *)ppntsd + dacl_offset); 986 ppdacl_size = le16_to_cpu(ppdacl_ptr->size); 987 if (ppdacl_size > ntacl_size || 988 ppdacl_size < sizeof(struct smb_acl)) 989 goto out; 990 991 set_ntacl_dacl(idmap, dacl_ptr, ppdacl_ptr, 992 ntacl_size - sizeof(struct smb_acl), 993 nowner_sid_ptr, ngroup_sid_ptr, 994 fattr); 995 } 996 pntsd->dacloffset = cpu_to_le32(offset); 997 offset += le16_to_cpu(dacl_ptr->size); 998 } 999 1000 out: 1001 kfree(nowner_sid_ptr); 1002 kfree(ngroup_sid_ptr); 1003 *secdesclen = offset; 1004 return rc; 1005 } 1006 1007 static void smb_set_ace(struct smb_ace *ace, const struct smb_sid *sid, u8 type, 1008 u8 flags, __le32 access_req) 1009 { 1010 ace->type = type; 1011 ace->flags = flags; 1012 ace->access_req = access_req; 1013 smb_copy_sid(&ace->sid, sid); 1014 ace->size = cpu_to_le16(1 + 1 + 2 + 4 + 1 + 1 + 6 + (sid->num_subauth * 4)); 1015 } 1016 1017 int smb_inherit_dacl(struct ksmbd_conn *conn, 1018 const struct path *path, 1019 unsigned int uid, unsigned int gid) 1020 { 1021 const struct smb_sid *psid, *creator = NULL; 1022 struct smb_ace *parent_aces, *aces; 1023 struct smb_acl *parent_pdacl; 1024 struct smb_ntsd *parent_pntsd = NULL; 1025 struct smb_sid owner_sid, group_sid; 1026 struct dentry *parent = path->dentry->d_parent; 1027 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1028 int inherited_flags = 0, flags = 0, i, nt_size = 0, pdacl_size; 1029 int rc = 0, dacloffset, pntsd_type, pntsd_size, acl_len, aces_size; 1030 u16 num_aces, ace_cnt = 0; 1031 char *aces_base; 1032 bool is_dir = S_ISDIR(d_inode(path->dentry)->i_mode); 1033 1034 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap, 1035 parent, &parent_pntsd); 1036 if (pntsd_size <= 0) 1037 return -ENOENT; 1038 dacloffset = le32_to_cpu(parent_pntsd->dacloffset); 1039 if (!dacloffset || (dacloffset + sizeof(struct smb_acl) > pntsd_size)) { 1040 rc = -EINVAL; 1041 goto free_parent_pntsd; 1042 } 1043 1044 parent_pdacl = (struct smb_acl *)((char *)parent_pntsd + dacloffset); 1045 acl_len = pntsd_size - dacloffset; 1046 num_aces = le16_to_cpu(parent_pdacl->num_aces); 1047 pntsd_type = le16_to_cpu(parent_pntsd->type); 1048 pdacl_size = le16_to_cpu(parent_pdacl->size); 1049 1050 if (pdacl_size > acl_len || pdacl_size < sizeof(struct smb_acl)) { 1051 rc = -EINVAL; 1052 goto free_parent_pntsd; 1053 } 1054 1055 aces_base = kmalloc(sizeof(struct smb_ace) * num_aces * 2, 1056 KSMBD_DEFAULT_GFP); 1057 if (!aces_base) { 1058 rc = -ENOMEM; 1059 goto free_parent_pntsd; 1060 } 1061 1062 aces = (struct smb_ace *)aces_base; 1063 parent_aces = (struct smb_ace *)((char *)parent_pdacl + 1064 sizeof(struct smb_acl)); 1065 aces_size = acl_len - sizeof(struct smb_acl); 1066 1067 if (pntsd_type & DACL_AUTO_INHERITED) 1068 inherited_flags = INHERITED_ACE; 1069 1070 for (i = 0; i < num_aces; i++) { 1071 int pace_size; 1072 1073 if (offsetof(struct smb_ace, access_req) > aces_size) 1074 break; 1075 1076 pace_size = le16_to_cpu(parent_aces->size); 1077 if (pace_size > aces_size) 1078 break; 1079 1080 aces_size -= pace_size; 1081 1082 flags = parent_aces->flags; 1083 if (!smb_inherit_flags(flags, is_dir)) 1084 goto pass; 1085 if (is_dir) { 1086 flags &= ~(INHERIT_ONLY_ACE | INHERITED_ACE); 1087 if (!(flags & CONTAINER_INHERIT_ACE)) 1088 flags |= INHERIT_ONLY_ACE; 1089 if (flags & NO_PROPAGATE_INHERIT_ACE) 1090 flags = 0; 1091 } else { 1092 flags = 0; 1093 } 1094 1095 if (!compare_sids(&creator_owner, &parent_aces->sid)) { 1096 creator = &creator_owner; 1097 id_to_sid(uid, SIDOWNER, &owner_sid); 1098 psid = &owner_sid; 1099 } else if (!compare_sids(&creator_group, &parent_aces->sid)) { 1100 creator = &creator_group; 1101 id_to_sid(gid, SIDUNIX_GROUP, &group_sid); 1102 psid = &group_sid; 1103 } else { 1104 creator = NULL; 1105 psid = &parent_aces->sid; 1106 } 1107 1108 if (is_dir && creator && flags & CONTAINER_INHERIT_ACE) { 1109 smb_set_ace(aces, psid, parent_aces->type, inherited_flags, 1110 parent_aces->access_req); 1111 nt_size += le16_to_cpu(aces->size); 1112 ace_cnt++; 1113 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size)); 1114 flags |= INHERIT_ONLY_ACE; 1115 psid = creator; 1116 } else if (is_dir && !(parent_aces->flags & NO_PROPAGATE_INHERIT_ACE)) { 1117 psid = &parent_aces->sid; 1118 } 1119 1120 smb_set_ace(aces, psid, parent_aces->type, flags | inherited_flags, 1121 parent_aces->access_req); 1122 nt_size += le16_to_cpu(aces->size); 1123 aces = (struct smb_ace *)((char *)aces + le16_to_cpu(aces->size)); 1124 ace_cnt++; 1125 pass: 1126 parent_aces = (struct smb_ace *)((char *)parent_aces + pace_size); 1127 } 1128 1129 if (nt_size > 0) { 1130 struct smb_ntsd *pntsd; 1131 struct smb_acl *pdacl; 1132 struct smb_sid *powner_sid = NULL, *pgroup_sid = NULL; 1133 int powner_sid_size = 0, pgroup_sid_size = 0, pntsd_size; 1134 int pntsd_alloc_size; 1135 1136 if (parent_pntsd->osidoffset) { 1137 powner_sid = (struct smb_sid *)((char *)parent_pntsd + 1138 le32_to_cpu(parent_pntsd->osidoffset)); 1139 powner_sid_size = 1 + 1 + 6 + (powner_sid->num_subauth * 4); 1140 } 1141 if (parent_pntsd->gsidoffset) { 1142 pgroup_sid = (struct smb_sid *)((char *)parent_pntsd + 1143 le32_to_cpu(parent_pntsd->gsidoffset)); 1144 pgroup_sid_size = 1 + 1 + 6 + (pgroup_sid->num_subauth * 4); 1145 } 1146 1147 pntsd_alloc_size = sizeof(struct smb_ntsd) + powner_sid_size + 1148 pgroup_sid_size + sizeof(struct smb_acl) + nt_size; 1149 1150 pntsd = kzalloc(pntsd_alloc_size, KSMBD_DEFAULT_GFP); 1151 if (!pntsd) { 1152 rc = -ENOMEM; 1153 goto free_aces_base; 1154 } 1155 1156 pntsd->revision = cpu_to_le16(1); 1157 pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PRESENT); 1158 if (le16_to_cpu(parent_pntsd->type) & DACL_AUTO_INHERITED) 1159 pntsd->type |= cpu_to_le16(DACL_AUTO_INHERITED); 1160 pntsd_size = sizeof(struct smb_ntsd); 1161 pntsd->osidoffset = parent_pntsd->osidoffset; 1162 pntsd->gsidoffset = parent_pntsd->gsidoffset; 1163 pntsd->dacloffset = parent_pntsd->dacloffset; 1164 1165 if ((u64)le32_to_cpu(pntsd->osidoffset) + powner_sid_size > 1166 pntsd_alloc_size) { 1167 rc = -EINVAL; 1168 kfree(pntsd); 1169 goto free_aces_base; 1170 } 1171 1172 if ((u64)le32_to_cpu(pntsd->gsidoffset) + pgroup_sid_size > 1173 pntsd_alloc_size) { 1174 rc = -EINVAL; 1175 kfree(pntsd); 1176 goto free_aces_base; 1177 } 1178 1179 if ((u64)le32_to_cpu(pntsd->dacloffset) + sizeof(struct smb_acl) + nt_size > 1180 pntsd_alloc_size) { 1181 rc = -EINVAL; 1182 kfree(pntsd); 1183 goto free_aces_base; 1184 } 1185 1186 if (pntsd->osidoffset) { 1187 struct smb_sid *owner_sid = (struct smb_sid *)((char *)pntsd + 1188 le32_to_cpu(pntsd->osidoffset)); 1189 memcpy(owner_sid, powner_sid, powner_sid_size); 1190 pntsd_size += powner_sid_size; 1191 } 1192 1193 if (pntsd->gsidoffset) { 1194 struct smb_sid *group_sid = (struct smb_sid *)((char *)pntsd + 1195 le32_to_cpu(pntsd->gsidoffset)); 1196 memcpy(group_sid, pgroup_sid, pgroup_sid_size); 1197 pntsd_size += pgroup_sid_size; 1198 } 1199 1200 if (pntsd->dacloffset) { 1201 struct smb_ace *pace; 1202 1203 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset)); 1204 pdacl->revision = cpu_to_le16(2); 1205 pdacl->size = cpu_to_le16(sizeof(struct smb_acl) + nt_size); 1206 pdacl->num_aces = cpu_to_le16(ace_cnt); 1207 pace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1208 memcpy(pace, aces_base, nt_size); 1209 pntsd_size += sizeof(struct smb_acl) + nt_size; 1210 } 1211 1212 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, pntsd_size, false); 1213 kfree(pntsd); 1214 } 1215 1216 free_aces_base: 1217 kfree(aces_base); 1218 free_parent_pntsd: 1219 kfree(parent_pntsd); 1220 return rc; 1221 } 1222 1223 bool smb_inherit_flags(int flags, bool is_dir) 1224 { 1225 if (!is_dir) 1226 return (flags & OBJECT_INHERIT_ACE) != 0; 1227 1228 if (flags & OBJECT_INHERIT_ACE && !(flags & NO_PROPAGATE_INHERIT_ACE)) 1229 return true; 1230 1231 if (flags & CONTAINER_INHERIT_ACE) 1232 return true; 1233 return false; 1234 } 1235 1236 int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path, 1237 __le32 *pdaccess, int uid) 1238 { 1239 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1240 struct smb_ntsd *pntsd = NULL; 1241 struct smb_acl *pdacl; 1242 struct posix_acl *posix_acls; 1243 int rc = 0, pntsd_size, acl_size, aces_size, pdacl_size, dacl_offset; 1244 struct smb_sid sid; 1245 int granted = le32_to_cpu(*pdaccess & ~FILE_MAXIMAL_ACCESS_LE); 1246 struct smb_ace *ace; 1247 int i, found = 0; 1248 unsigned int access_bits = 0; 1249 struct smb_ace *others_ace = NULL; 1250 struct posix_acl_entry *pa_entry; 1251 unsigned int sid_type = SIDOWNER; 1252 unsigned short ace_size; 1253 1254 ksmbd_debug(SMB, "check permission using windows acl\n"); 1255 pntsd_size = ksmbd_vfs_get_sd_xattr(conn, idmap, 1256 path->dentry, &pntsd); 1257 if (pntsd_size <= 0 || !pntsd) 1258 goto err_out; 1259 1260 dacl_offset = le32_to_cpu(pntsd->dacloffset); 1261 if (!dacl_offset || 1262 (dacl_offset + sizeof(struct smb_acl) > pntsd_size)) 1263 goto err_out; 1264 1265 pdacl = (struct smb_acl *)((char *)pntsd + le32_to_cpu(pntsd->dacloffset)); 1266 acl_size = pntsd_size - dacl_offset; 1267 pdacl_size = le16_to_cpu(pdacl->size); 1268 1269 if (pdacl_size > acl_size || pdacl_size < sizeof(struct smb_acl)) 1270 goto err_out; 1271 1272 if (!pdacl->num_aces) { 1273 if (!(pdacl_size - sizeof(struct smb_acl)) && 1274 *pdaccess & ~(FILE_READ_CONTROL_LE | FILE_WRITE_DAC_LE)) { 1275 rc = -EACCES; 1276 goto err_out; 1277 } 1278 goto err_out; 1279 } 1280 1281 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE) { 1282 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES | 1283 DELETE; 1284 1285 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1286 aces_size = acl_size - sizeof(struct smb_acl); 1287 for (i = 0; i < le16_to_cpu(pdacl->num_aces); i++) { 1288 if (offsetof(struct smb_ace, access_req) > aces_size) 1289 break; 1290 ace_size = le16_to_cpu(ace->size); 1291 if (ace_size > aces_size) 1292 break; 1293 aces_size -= ace_size; 1294 granted |= le32_to_cpu(ace->access_req); 1295 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size)); 1296 } 1297 1298 if (!pdacl->num_aces) 1299 granted = GENERIC_ALL_FLAGS; 1300 } 1301 1302 if (!uid) 1303 sid_type = SIDUNIX_USER; 1304 id_to_sid(uid, sid_type, &sid); 1305 1306 ace = (struct smb_ace *)((char *)pdacl + sizeof(struct smb_acl)); 1307 aces_size = acl_size - sizeof(struct smb_acl); 1308 for (i = 0; i < le16_to_cpu(pdacl->num_aces); i++) { 1309 if (offsetof(struct smb_ace, access_req) > aces_size) 1310 break; 1311 ace_size = le16_to_cpu(ace->size); 1312 if (ace_size > aces_size) 1313 break; 1314 aces_size -= ace_size; 1315 1316 if (!compare_sids(&sid, &ace->sid) || 1317 !compare_sids(&sid_unix_NFS_mode, &ace->sid)) { 1318 found = 1; 1319 break; 1320 } 1321 if (!compare_sids(&sid_everyone, &ace->sid)) 1322 others_ace = ace; 1323 1324 ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size)); 1325 } 1326 1327 if (*pdaccess & FILE_MAXIMAL_ACCESS_LE && found) { 1328 granted = READ_CONTROL | WRITE_DAC | FILE_READ_ATTRIBUTES | 1329 DELETE; 1330 1331 granted |= le32_to_cpu(ace->access_req); 1332 1333 if (!pdacl->num_aces) 1334 granted = GENERIC_ALL_FLAGS; 1335 } 1336 1337 if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { 1338 posix_acls = get_inode_acl(d_inode(path->dentry), ACL_TYPE_ACCESS); 1339 if (!IS_ERR_OR_NULL(posix_acls) && !found) { 1340 unsigned int id = -1; 1341 1342 pa_entry = posix_acls->a_entries; 1343 for (i = 0; i < posix_acls->a_count; i++, pa_entry++) { 1344 if (pa_entry->e_tag == ACL_USER) 1345 id = posix_acl_uid_translate(idmap, pa_entry); 1346 else if (pa_entry->e_tag == ACL_GROUP) 1347 id = posix_acl_gid_translate(idmap, pa_entry); 1348 else 1349 continue; 1350 1351 if (id == uid) { 1352 mode_to_access_flags(pa_entry->e_perm, 1353 0777, 1354 &access_bits); 1355 if (!access_bits) 1356 access_bits = 1357 SET_MINIMUM_RIGHTS; 1358 posix_acl_release(posix_acls); 1359 goto check_access_bits; 1360 } 1361 } 1362 } 1363 if (!IS_ERR_OR_NULL(posix_acls)) 1364 posix_acl_release(posix_acls); 1365 } 1366 1367 if (!found) { 1368 if (others_ace) { 1369 ace = others_ace; 1370 } else { 1371 ksmbd_debug(SMB, "Can't find corresponding sid\n"); 1372 rc = -EACCES; 1373 goto err_out; 1374 } 1375 } 1376 1377 switch (ace->type) { 1378 case ACCESS_ALLOWED_ACE_TYPE: 1379 access_bits = le32_to_cpu(ace->access_req); 1380 break; 1381 case ACCESS_DENIED_ACE_TYPE: 1382 case ACCESS_DENIED_CALLBACK_ACE_TYPE: 1383 access_bits = le32_to_cpu(~ace->access_req); 1384 break; 1385 } 1386 1387 check_access_bits: 1388 if (granted & 1389 ~(access_bits | FILE_READ_ATTRIBUTES | READ_CONTROL | WRITE_DAC | DELETE)) { 1390 ksmbd_debug(SMB, "Access denied with winACL, granted : %x, access_req : %x\n", 1391 granted, le32_to_cpu(ace->access_req)); 1392 rc = -EACCES; 1393 goto err_out; 1394 } 1395 1396 *pdaccess = cpu_to_le32(granted); 1397 err_out: 1398 kfree(pntsd); 1399 return rc; 1400 } 1401 1402 int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon, 1403 const struct path *path, struct smb_ntsd *pntsd, int ntsd_len, 1404 bool type_check, bool get_write) 1405 { 1406 int rc; 1407 struct smb_fattr fattr = {{0}}; 1408 struct inode *inode = d_inode(path->dentry); 1409 struct mnt_idmap *idmap = mnt_idmap(path->mnt); 1410 struct iattr newattrs; 1411 1412 fattr.cf_uid = INVALID_UID; 1413 fattr.cf_gid = INVALID_GID; 1414 fattr.cf_mode = inode->i_mode; 1415 1416 rc = parse_sec_desc(idmap, pntsd, ntsd_len, &fattr); 1417 if (rc) 1418 goto out; 1419 1420 newattrs.ia_valid = ATTR_CTIME; 1421 if (!uid_eq(fattr.cf_uid, INVALID_UID)) { 1422 newattrs.ia_valid |= ATTR_UID; 1423 newattrs.ia_uid = fattr.cf_uid; 1424 } 1425 if (!gid_eq(fattr.cf_gid, INVALID_GID)) { 1426 newattrs.ia_valid |= ATTR_GID; 1427 newattrs.ia_gid = fattr.cf_gid; 1428 } 1429 newattrs.ia_valid |= ATTR_MODE; 1430 newattrs.ia_mode = (inode->i_mode & ~0777) | (fattr.cf_mode & 0777); 1431 1432 ksmbd_vfs_remove_acl_xattrs(idmap, path); 1433 /* Update posix acls */ 1434 if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) { 1435 rc = set_posix_acl(idmap, path->dentry, 1436 ACL_TYPE_ACCESS, fattr.cf_acls); 1437 if (rc < 0) 1438 ksmbd_debug(SMB, 1439 "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1440 rc); 1441 if (S_ISDIR(inode->i_mode) && fattr.cf_dacls) { 1442 rc = set_posix_acl(idmap, path->dentry, 1443 ACL_TYPE_DEFAULT, fattr.cf_dacls); 1444 if (rc) 1445 ksmbd_debug(SMB, 1446 "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1447 rc); 1448 } 1449 } 1450 1451 inode_lock(inode); 1452 rc = notify_change(idmap, path->dentry, &newattrs, NULL); 1453 inode_unlock(inode); 1454 if (rc) 1455 goto out; 1456 1457 /* Check it only calling from SD BUFFER context */ 1458 if (type_check && !(le16_to_cpu(pntsd->type) & DACL_PRESENT)) 1459 goto out; 1460 1461 if (test_share_config_flag(tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) { 1462 /* Update WinACL in xattr */ 1463 ksmbd_vfs_remove_sd_xattrs(idmap, path); 1464 ksmbd_vfs_set_sd_xattr(conn, idmap, path, pntsd, ntsd_len, 1465 get_write); 1466 } 1467 1468 out: 1469 posix_acl_release(fattr.cf_acls); 1470 posix_acl_release(fattr.cf_dacls); 1471 return rc; 1472 } 1473 1474 void ksmbd_init_domain(u32 *sub_auth) 1475 { 1476 int i; 1477 1478 memcpy(&server_conf.domain_sid, &domain, sizeof(struct smb_sid)); 1479 for (i = 0; i < 3; ++i) 1480 server_conf.domain_sid.sub_auth[i + 1] = cpu_to_le32(sub_auth[i]); 1481 } 1482