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