fs/ksmbd/smbacl.c

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