source4/winbind/idmap.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Map SIDs to unixids and back
   5
   6    Copyright (C) Kai Blin 2008
   7    Copyright (C) Andrew Bartlett 2012
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth/auth.h"
  25 #include "librpc/gen_ndr/ndr_security.h"
  26 #include "lib/util_unixsids.h"
  27 #include <ldb.h>
  28 #include "ldb_wrap.h"
  29 #include "param/param.h"
  30 #include "winbind/idmap.h"
  31 #include "libcli/security/security.h"
  32 #include "libcli/ldap/ldap_ndr.h"
  33 #include "dsdb/samdb/samdb.h"
  34 #include "../libds/common/flags.h"
  35
  36 /**
  37  * Get uid/gid bounds from idmap database
  38  *
  39  * \param idmap_ctx idmap context to use
  40  * \param low lower uid/gid bound is stored here
  41  * \param high upper uid/gid bound is stored here
  42  * \return 0 on success, nonzero on failure
  43  */
  44 static int idmap_get_bounds(struct idmap_context *idmap_ctx, uint32_t *low,
  45                 uint32_t *high)
  46 {
  47         int ret = -1;
  48         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
  49         struct ldb_dn *dn;
  50         struct ldb_result *res = NULL;
  51         TALLOC_CTX *tmp_ctx = talloc_new(idmap_ctx);
  52         uint32_t lower_bound = (uint32_t) -1;
  53         uint32_t upper_bound = (uint32_t) -1;
  54
  55         dn = ldb_dn_new(tmp_ctx, ldb, "CN=CONFIG");
  56         if (dn == NULL) goto failed;
  57
  58         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
  59         if (ret != LDB_SUCCESS) goto failed;
  60
  61         if (res->count != 1) {
  62                 ret = -1;
  63                 goto failed;
  64         }
  65
  66         lower_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "lowerBound", -1);
  67         if (lower_bound != (uint32_t) -1) {
  68                 ret = LDB_SUCCESS;
  69         } else {
  70                 ret = -1;
  71                 goto failed;
  72         }
  73
  74         upper_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "upperBound", -1);
  75         if (upper_bound != (uint32_t) -1) {
  76                 ret = LDB_SUCCESS;
  77         } else {
  78                 ret = -1;
  79         }
  80
  81 failed:
  82         talloc_free(tmp_ctx);
  83         *low  = lower_bound;
  84         *high = upper_bound;
  85         return ret;
  86 }
  87
  88 /**
  89  * Add a dom_sid structure to a ldb_message
  90  * \param idmap_ctx idmap context to use
  91  * \param mem_ctx talloc context to use
  92  * \param ldb_message ldb message to add dom_sid to
  93  * \param attr_name name of the attribute to store the dom_sid in
  94  * \param sid dom_sid to store
  95  * \return 0 on success, an ldb error code on failure.
  96  */
  97 static int idmap_msg_add_dom_sid(struct idmap_context *idmap_ctx,
  98                 TALLOC_CTX *mem_ctx, struct ldb_message *msg,
  99                 const char *attr_name, const struct dom_sid *sid)
 100 {
 101         struct ldb_val val;
 102         enum ndr_err_code ndr_err;
 103
 104         ndr_err = ndr_push_struct_blob(&val, mem_ctx, sid,
 105                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 106
 107         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 108                 return -1;
 109         }
 110
 111         return ldb_msg_add_value(msg, attr_name, &val, NULL);
 112 }
 113
 114 /**
 115  * Get a dom_sid structure from a ldb message.
 116  *
 117  * \param mem_ctx talloc context to allocate dom_sid memory in
 118  * \param msg ldb_message to get dom_sid from
 119  * \param attr_name key that has the dom_sid as data
 120  * \return dom_sid structure on success, NULL on failure
 121  */
 122 static struct dom_sid *idmap_msg_get_dom_sid(TALLOC_CTX *mem_ctx,
 123                 struct ldb_message *msg, const char *attr_name)
 124 {
 125         struct dom_sid *sid;
 126         const struct ldb_val *val;
 127         enum ndr_err_code ndr_err;
 128
 129         val = ldb_msg_find_ldb_val(msg, attr_name);
 130         if (val == NULL) {
 131                 return NULL;
 132         }
 133
 134         sid = talloc(mem_ctx, struct dom_sid);
 135         if (sid == NULL) {
 136                 return NULL;
 137         }
 138
 139         ndr_err = ndr_pull_struct_blob(val, sid, sid,
 140                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 141         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 142                 talloc_free(sid);
 143                 return NULL;
 144         }
 145
 146         return sid;
 147 }
 148
 149 /**
 150  * Initialize idmap context
 151  *
 152  * talloc_free to close.
 153  *
 154  * \param mem_ctx talloc context to use.
 155  * \return allocated idmap_context on success, NULL on error
 156  */
 157 struct idmap_context *idmap_init(TALLOC_CTX *mem_ctx,
 158                                  struct tevent_context *ev_ctx,
 159                                  struct loadparm_context *lp_ctx)
 160 {
 161         struct idmap_context *idmap_ctx;
 162
 163         idmap_ctx = talloc(mem_ctx, struct idmap_context);
 164         if (idmap_ctx == NULL) {
 165                 return NULL;
 166         }
 167
 168         idmap_ctx->lp_ctx = lp_ctx;
 169
 170         idmap_ctx->ldb_ctx = ldb_wrap_connect(idmap_ctx, ev_ctx, lp_ctx,
 171                                               "idmap.ldb",
 172                                               system_session(lp_ctx),
 173                                               NULL, 0);
 174         if (idmap_ctx->ldb_ctx == NULL) {
 175                 goto fail;
 176         }
 177
 178         idmap_ctx->samdb = samdb_connect(idmap_ctx,
 179                                          ev_ctx,
 180                                          lp_ctx,
 181                                          system_session(lp_ctx),
 182                                          NULL,
 183                                          0);
 184         if (idmap_ctx->samdb == NULL) {
 185                 DEBUG(0, ("Failed to load sam.ldb in idmap_init\n"));
 186                 goto fail;
 187         }
 188
 189         return idmap_ctx;
 190 fail:
 191         TALLOC_FREE(idmap_ctx);
 192         return NULL;
 193 }
 194
 195 /**
 196  * Convert an unixid to the corresponding SID
 197  *
 198  * \param idmap_ctx idmap context to use
 199  * \param mem_ctx talloc context the memory for the struct dom_sid is allocated
 200  * from.
 201  * \param unixid pointer to a unixid struct to convert
 202  * \param sid pointer that will take the struct dom_sid pointer if the mapping
 203  * succeeds.
 204  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping not
 205  * possible or some other NTSTATUS that is more descriptive on failure.
 206  */
 207
 208 static NTSTATUS idmap_xid_to_sid(struct idmap_context *idmap_ctx,
 209                                  TALLOC_CTX *mem_ctx,
 210                                  struct unixid *unixid,
 211                                  struct dom_sid **sid)
 212 {
 213         int ret;
 214         NTSTATUS status = NT_STATUS_NONE_MAPPED;
 215         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
 216         struct ldb_result *res = NULL;
 217         struct ldb_message *msg;
 218         const struct dom_sid *unix_sid;
 219         struct dom_sid *new_sid;
 220         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 221         const char *id_type;
 222
 223         const char *sam_attrs[] = {"objectSid", NULL};
 224
 225         /*
 226          * First check against our local DB, to see if this user has a
 227          * mapping there.  This means that the Samba4 AD DC behaves
 228          * much like a winbindd member server running idmap_ad
 229          */
 230
 231         switch (unixid->type) {
 232                 case ID_TYPE_UID:
 233                         if (lpcfg_parm_bool(idmap_ctx->lp_ctx, NULL, "idmap_ldb", "use rfc2307", false)) {
 234                                 ret = dsdb_search_one(idmap_ctx->samdb, tmp_ctx, &msg,
 235                                                       ldb_get_default_basedn(idmap_ctx->samdb),
 236                                                       LDB_SCOPE_SUBTREE,
 237                                                       sam_attrs, 0,
 238                                                       "(&(|(sAMaccountType=%u)(sAMaccountType=%u)(sAMaccountType=%u))"
 239                                                       "(uidNumber=%u)(objectSid=*))",
 240                                                       ATYPE_ACCOUNT, ATYPE_WORKSTATION_TRUST, ATYPE_INTERDOMAIN_TRUST, unixid->id);
 241                         } else {
 242                                 /* If we are not to use the rfc2307 attributes, we just emulate a non-match */
 243                                 ret = LDB_ERR_NO_SUCH_OBJECT;
 244                         }
 245
 246                         if (ret == LDB_ERR_CONSTRAINT_VIOLATION) {
 247                                 DEBUG(1, ("Search for uidNumber=%lu gave duplicate results, failing to map to a SID!\n",
 248                                           (unsigned long)unixid->id));
 249                                 status = NT_STATUS_NONE_MAPPED;
 250                                 goto failed;
 251                         } else if (ret == LDB_SUCCESS) {
 252                                 *sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
 253                                 if (*sid == NULL) {
 254                                         DEBUG(1, ("Search for uidNumber=%lu did not return an objectSid!\n",
 255                                                   (unsigned long)unixid->id));
 256                                         status = NT_STATUS_NONE_MAPPED;
 257                                         goto failed;
 258                                 }
 259                                 talloc_free(tmp_ctx);
 260                                 return NT_STATUS_OK;
 261                         } else if (ret != LDB_ERR_NO_SUCH_OBJECT) {
 262                                 DEBUG(1, ("Search for uidNumber=%lu gave '%s', failing to map to a SID!\n",
 263                                           (unsigned long)unixid->id, ldb_errstring(idmap_ctx->samdb)));
 264                                 status = NT_STATUS_NONE_MAPPED;
 265                                 goto failed;
 266                         }
 267
 268                         id_type = "ID_TYPE_UID";
 269                         break;
 270                 case ID_TYPE_GID:
 271                         if (lpcfg_parm_bool(idmap_ctx->lp_ctx, NULL, "idmap_ldb", "use rfc2307", false)) {
 272                                 ret = dsdb_search_one(idmap_ctx->samdb, tmp_ctx, &msg,
 273                                                       ldb_get_default_basedn(idmap_ctx->samdb),
 274                                                       LDB_SCOPE_SUBTREE,
 275                                                       sam_attrs, 0,
 276                                                       "(&(|(sAMaccountType=%u)(sAMaccountType=%u))(gidNumber=%u))",
 277                                                       ATYPE_SECURITY_GLOBAL_GROUP, ATYPE_SECURITY_LOCAL_GROUP,
 278                                                       unixid->id);
 279                         } else {
 280                                 /* If we are not to use the rfc2307 attributes, we just emulate a non-match */
 281                                 ret = LDB_ERR_NO_SUCH_OBJECT;
 282                         }
 283                         if (ret == LDB_ERR_CONSTRAINT_VIOLATION) {
 284                                 DEBUG(1, ("Search for gidNumber=%lu gave duplicate results, failing to map to a SID!\n",
 285                                           (unsigned long)unixid->id));
 286                                 status = NT_STATUS_NONE_MAPPED;
 287                                 goto failed;
 288                         } else if (ret == LDB_SUCCESS) {
 289                                 *sid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
 290                                 if (*sid == NULL) {
 291                                         DEBUG(1, ("Search for gidNumber=%lu did not return an objectSid!\n",
 292                                                   (unsigned long)unixid->id));
 293                                         status = NT_STATUS_NONE_MAPPED;
 294                                         goto failed;
 295                                 }
 296                                 talloc_free(tmp_ctx);
 297                                 return NT_STATUS_OK;
 298                         } else if (ret != LDB_ERR_NO_SUCH_OBJECT) {
 299                                 DEBUG(1, ("Search for gidNumber=%lu gave '%s', failing to map to a SID!\n",
 300                                           (unsigned long)unixid->id, ldb_errstring(idmap_ctx->samdb)));
 301                                 status = NT_STATUS_NONE_MAPPED;
 302                                 goto failed;
 303                         }
 304
 305                         id_type = "ID_TYPE_GID";
 306                         break;
 307                 default:
 308                         DEBUG(1, ("unixid->type must be type gid or uid (got %u) for lookup with id %lu\n",
 309                                   (unsigned)unixid->type, (unsigned long)unixid->id));
 310                         status = NT_STATUS_NONE_MAPPED;
 311                         goto failed;
 312         }
 313
 314         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 315                                  NULL, "(&(|(type=ID_TYPE_BOTH)(type=%s))"
 316                                  "(xidNumber=%u))", id_type, unixid->id);
 317         if (ret != LDB_SUCCESS) {
 318                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 319                 status = NT_STATUS_NONE_MAPPED;
 320                 goto failed;
 321         }
 322
 323         if (res->count == 1) {
 324                 const char *type = ldb_msg_find_attr_as_string(res->msgs[0],
 325                                                                "type", NULL);
 326
 327                 *sid = idmap_msg_get_dom_sid(mem_ctx, res->msgs[0],
 328                                              "objectSid");
 329                 if (*sid == NULL) {
 330                         DEBUG(1, ("Failed to get sid from db: %u\n", ret));
 331                         status = NT_STATUS_NONE_MAPPED;
 332                         goto failed;
 333                 }
 334
 335                 if (type == NULL) {
 336                         DEBUG(1, ("Invalid type for mapping entry.\n"));
 337                         talloc_free(tmp_ctx);
 338                         return NT_STATUS_NONE_MAPPED;
 339                 }
 340
 341                 if (strcmp(type, "ID_TYPE_BOTH") == 0) {
 342                         unixid->type = ID_TYPE_BOTH;
 343                 } else if (strcmp(type, "ID_TYPE_UID") == 0) {
 344                         unixid->type = ID_TYPE_UID;
 345                 } else {
 346                         unixid->type = ID_TYPE_GID;
 347                 }
 348
 349                 talloc_free(tmp_ctx);
 350                 return NT_STATUS_OK;
 351         }
 352
 353         DEBUG(6, ("xid not found in idmap db, create S-1-22- SID.\n"));
 354
 355         /* For local users/groups , we just create a rid = uid/gid */
 356         if (unixid->type == ID_TYPE_UID) {
 357                 unix_sid = &global_sid_Unix_Users;
 358         } else {
 359                 unix_sid = &global_sid_Unix_Groups;
 360         }
 361
 362         new_sid = dom_sid_add_rid(mem_ctx, unix_sid, unixid->id);
 363         if (new_sid == NULL) {
 364                 status = NT_STATUS_NO_MEMORY;
 365                 goto failed;
 366         }
 367
 368         *sid = new_sid;
 369         talloc_free(tmp_ctx);
 370         return NT_STATUS_OK;
 371
 372 failed:
 373         talloc_free(tmp_ctx);
 374         return status;
 375 }
 376
 377
 378 /**
 379  * Map a SID to an unixid struct.
 380  *
 381  * If no mapping exists, a new mapping will be created.
 382  *
 383  * \param idmap_ctx idmap context to use
 384  * \param mem_ctx talloc context to use
 385  * \param sid SID to map to an unixid struct
 386  * \param unixid pointer to a unixid struct
 387  * \return NT_STATUS_OK on success, NT_STATUS_INVALID_SID if the sid is not from
 388  * a trusted domain and idmap trusted only = true, NT_STATUS_NONE_MAPPED if the
 389  * mapping failed.
 390  */
 391 static NTSTATUS idmap_sid_to_xid(struct idmap_context *idmap_ctx,
 392                                  TALLOC_CTX *mem_ctx,
 393                                  const struct dom_sid *sid,
 394                                  struct unixid *unixid)
 395 {
 396         int ret;
 397         NTSTATUS status = NT_STATUS_NONE_MAPPED;
 398         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
 399         struct ldb_dn *dn;
 400         struct ldb_message *hwm_msg, *map_msg, *sam_msg;
 401         struct ldb_result *res = NULL;
 402         int trans = -1;
 403         uint32_t low, high, hwm, new_xid;
 404         struct dom_sid_buf sid_string;
 405         char *unixid_string, *hwm_string;
 406         bool hwm_entry_exists;
 407         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 408         const char *sam_attrs[] = {"uidNumber", "gidNumber", "samAccountType", NULL};
 409
 410         if (sid_check_is_in_unix_users(sid)) {
 411                 uint32_t rid;
 412                 DEBUG(6, ("This is a local unix uid, just calculate that.\n"));
 413                 status = dom_sid_split_rid(tmp_ctx, sid, NULL, &rid);
 414                 if (!NT_STATUS_IS_OK(status)) {
 415                         talloc_free(tmp_ctx);
 416                         return status;
 417                 }
 418
 419                 unixid->id = rid;
 420                 unixid->type = ID_TYPE_UID;
 421
 422                 talloc_free(tmp_ctx);
 423                 return NT_STATUS_OK;
 424         }
 425
 426         if (sid_check_is_in_unix_groups(sid)) {
 427                 uint32_t rid;
 428                 DEBUG(6, ("This is a local unix gid, just calculate that.\n"));
 429                 status = dom_sid_split_rid(tmp_ctx, sid, NULL, &rid);
 430                 if (!NT_STATUS_IS_OK(status)) {
 431                         talloc_free(tmp_ctx);
 432                         return status;
 433                 }
 434
 435                 unixid->id = rid;
 436                 unixid->type = ID_TYPE_GID;
 437
 438                 talloc_free(tmp_ctx);
 439                 return NT_STATUS_OK;
 440         }
 441
 442         /*
 443          * First check against our local DB, to see if this user has a
 444          * mapping there.  This means that the Samba4 AD DC behaves
 445          * much like a winbindd member server running idmap_ad
 446          */
 447
 448         if (lpcfg_parm_bool(idmap_ctx->lp_ctx, NULL, "idmap_ldb", "use rfc2307", false)) {
 449                 struct dom_sid_buf buf;
 450                 ret = dsdb_search_one(idmap_ctx->samdb, tmp_ctx, &sam_msg,
 451                                       ldb_get_default_basedn(idmap_ctx->samdb),
 452                                       LDB_SCOPE_SUBTREE, sam_attrs, 0,
 453                                       "(&(objectSid=%s)"
 454                                       "(|(sAMaccountType=%u)(sAMaccountType=%u)(sAMaccountType=%u)"
 455                                       "(sAMaccountType=%u)(sAMaccountType=%u))"
 456                                       "(|(uidNumber=*)(gidNumber=*)))",
 457                                       dom_sid_str_buf(sid, &buf),
 458                                       ATYPE_ACCOUNT, ATYPE_WORKSTATION_TRUST, ATYPE_INTERDOMAIN_TRUST,
 459                                       ATYPE_SECURITY_GLOBAL_GROUP, ATYPE_SECURITY_LOCAL_GROUP);
 460         } else {
 461                 /* If we are not to use the rfc2307 attributes, we just emulate a non-match */
 462                 ret = LDB_ERR_NO_SUCH_OBJECT;
 463         }
 464
 465         if (ret == LDB_ERR_CONSTRAINT_VIOLATION) {
 466                 struct dom_sid_buf buf;
 467                 DEBUG(1, ("Search for objectSid=%s gave duplicate results, failing to map to a unix ID!\n",
 468                           dom_sid_str_buf(sid, &buf)));
 469                 status = NT_STATUS_NONE_MAPPED;
 470                 goto failed;
 471         } else if (ret == LDB_SUCCESS) {
 472                 uint32_t account_type = ldb_msg_find_attr_as_uint(sam_msg, "sAMaccountType", 0);
 473                 if ((account_type == ATYPE_ACCOUNT) ||
 474                     (account_type == ATYPE_WORKSTATION_TRUST ) ||
 475                     (account_type == ATYPE_INTERDOMAIN_TRUST ))
 476                 {
 477                         const struct ldb_val *v = ldb_msg_find_ldb_val(sam_msg, "uidNumber");
 478                         if (v) {
 479                                 unixid->type = ID_TYPE_UID;
 480                                 unixid->id = ldb_msg_find_attr_as_uint(sam_msg, "uidNumber", -1);
 481                                 talloc_free(tmp_ctx);
 482                                 return NT_STATUS_OK;
 483                         }
 484
 485                 } else if ((account_type == ATYPE_SECURITY_GLOBAL_GROUP) ||
 486                            (account_type == ATYPE_SECURITY_LOCAL_GROUP))
 487                 {
 488                         const struct ldb_val *v = ldb_msg_find_ldb_val(sam_msg, "gidNumber");
 489                         if (v) {
 490                                 unixid->type = ID_TYPE_GID;
 491                                 unixid->id = ldb_msg_find_attr_as_uint(sam_msg, "gidNumber", -1);
 492                                 talloc_free(tmp_ctx);
 493                                 return NT_STATUS_OK;
 494                         }
 495                 }
 496         } else if (ret != LDB_ERR_NO_SUCH_OBJECT) {
 497                 struct dom_sid_buf buf;
 498                 DEBUG(1, ("Search for objectSid=%s gave '%s', failing to map to a SID!\n",
 499                           dom_sid_str_buf(sid, &buf),
 500                           ldb_errstring(idmap_ctx->samdb)));
 501
 502                 status = NT_STATUS_NONE_MAPPED;
 503                 goto failed;
 504         }
 505
 506         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 507                                  NULL, "(&(objectClass=sidMap)(objectSid=%s))",
 508                                  ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 509         if (ret != LDB_SUCCESS) {
 510                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 511                 talloc_free(tmp_ctx);
 512                 return NT_STATUS_NONE_MAPPED;
 513         }
 514
 515         if (res->count == 1) {
 516                 const char *type = ldb_msg_find_attr_as_string(res->msgs[0],
 517                                                                "type", NULL);
 518                 new_xid = ldb_msg_find_attr_as_uint(res->msgs[0], "xidNumber",
 519                                                     -1);
 520                 if (new_xid == (uint32_t) -1) {
 521                         DEBUG(1, ("Invalid xid mapping.\n"));
 522                         talloc_free(tmp_ctx);
 523                         return NT_STATUS_NONE_MAPPED;
 524                 }
 525
 526                 if (type == NULL) {
 527                         DEBUG(1, ("Invalid type for mapping entry.\n"));
 528                         talloc_free(tmp_ctx);
 529                         return NT_STATUS_NONE_MAPPED;
 530                 }
 531
 532                 unixid->id = new_xid;
 533
 534                 if (strcmp(type, "ID_TYPE_BOTH") == 0) {
 535                         unixid->type = ID_TYPE_BOTH;
 536                 } else if (strcmp(type, "ID_TYPE_UID") == 0) {
 537                         unixid->type = ID_TYPE_UID;
 538                 } else {
 539                         unixid->type = ID_TYPE_GID;
 540                 }
 541
 542                 talloc_free(tmp_ctx);
 543                 return NT_STATUS_OK;
 544         }
 545
 546         DEBUG(6, ("No existing mapping found, attempting to create one.\n"));
 547
 548         trans = ldb_transaction_start(ldb);
 549         if (trans != LDB_SUCCESS) {
 550                 status = NT_STATUS_NONE_MAPPED;
 551                 goto failed;
 552         }
 553
 554         /* Redo the search to make sure noone changed the mapping while we
 555          * weren't looking */
 556         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 557                                  NULL, "(&(objectClass=sidMap)(objectSid=%s))",
 558                                  ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 559         if (ret != LDB_SUCCESS) {
 560                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 561                 status = NT_STATUS_NONE_MAPPED;
 562                 goto failed;
 563         }
 564
 565         if (res->count > 0) {
 566                 DEBUG(1, ("Database changed while trying to add a sidmap.\n"));
 567                 status = NT_STATUS_RETRY;
 568                 goto failed;
 569         }
 570
 571         ret = idmap_get_bounds(idmap_ctx, &low, &high);
 572         if (ret != LDB_SUCCESS) {
 573                 status = NT_STATUS_NONE_MAPPED;
 574                 goto failed;
 575         }
 576
 577         dn = ldb_dn_new(tmp_ctx, ldb, "CN=CONFIG");
 578         if (dn == NULL) {
 579                 status = NT_STATUS_NO_MEMORY;
 580                 goto failed;
 581         }
 582
 583         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
 584         if (ret != LDB_SUCCESS) {
 585                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 586                 status = NT_STATUS_NONE_MAPPED;
 587                 goto failed;
 588         }
 589
 590         if (res->count != 1) {
 591                 DEBUG(1, ("No CN=CONFIG record, idmap database is broken.\n"));
 592                 status = NT_STATUS_NONE_MAPPED;
 593                 goto failed;
 594         }
 595
 596         hwm = ldb_msg_find_attr_as_uint(res->msgs[0], "xidNumber", -1);
 597         if (hwm == (uint32_t)-1) {
 598                 hwm = low;
 599                 hwm_entry_exists = false;
 600         } else {
 601                 hwm_entry_exists = true;
 602         }
 603
 604         if (hwm > high) {
 605                 DEBUG(1, ("Out of xids to allocate.\n"));
 606                 status = NT_STATUS_NONE_MAPPED;
 607                 goto failed;
 608         }
 609
 610         hwm_msg = ldb_msg_new(tmp_ctx);
 611         if (hwm_msg == NULL) {
 612                 DEBUG(1, ("Out of memory when creating ldb_message\n"));
 613                 status = NT_STATUS_NO_MEMORY;
 614                 goto failed;
 615         }
 616
 617         hwm_msg->dn = dn;
 618
 619         new_xid = hwm;
 620         hwm++;
 621
 622         hwm_string = talloc_asprintf(tmp_ctx, "%u", hwm);
 623         if (hwm_string == NULL) {
 624                 status = NT_STATUS_NO_MEMORY;
 625                 goto failed;
 626         }
 627
 628         dom_sid_str_buf(sid, &sid_string);
 629
 630         unixid_string = talloc_asprintf(tmp_ctx, "%u", new_xid);
 631         if (unixid_string == NULL) {
 632                 status = NT_STATUS_NO_MEMORY;
 633                 goto failed;
 634         }
 635
 636         if (hwm_entry_exists) {
 637                 struct ldb_message_element *els;
 638                 struct ldb_val *vals;
 639
 640                 /* We're modifying the entry, not just adding a new one. */
 641                 els = talloc_array(tmp_ctx, struct ldb_message_element, 2);
 642                 if (els == NULL) {
 643                         status = NT_STATUS_NO_MEMORY;
 644                         goto failed;
 645                 }
 646
 647                 vals = talloc_array(tmp_ctx, struct ldb_val, 2);
 648                 if (els == NULL) {
 649                         status = NT_STATUS_NO_MEMORY;
 650                         goto failed;
 651                 }
 652
 653                 hwm_msg->num_elements = 2;
 654                 hwm_msg->elements = els;
 655
 656                 els[0].num_values = 1;
 657                 els[0].values = &vals[0];
 658                 els[0].flags = LDB_FLAG_MOD_DELETE;
 659                 els[0].name = talloc_strdup(tmp_ctx, "xidNumber");
 660                 if (els[0].name == NULL) {
 661                         status = NT_STATUS_NO_MEMORY;
 662                         goto failed;
 663                 }
 664
 665                 els[1].num_values = 1;
 666                 els[1].values = &vals[1];
 667                 els[1].flags = LDB_FLAG_MOD_ADD;
 668                 els[1].name = els[0].name;
 669
 670                 vals[0].data = (uint8_t *)unixid_string;
 671                 vals[0].length = strlen(unixid_string);
 672                 vals[1].data = (uint8_t *)hwm_string;
 673                 vals[1].length = strlen(hwm_string);
 674         } else {
 675                 ret = ldb_msg_add_empty(hwm_msg, "xidNumber", LDB_FLAG_MOD_ADD,
 676                                         NULL);
 677                 if (ret != LDB_SUCCESS) {
 678                         status = NT_STATUS_NONE_MAPPED;
 679                         goto failed;
 680                 }
 681
 682                 ret = ldb_msg_add_string(hwm_msg, "xidNumber", hwm_string);
 683                 if (ret != LDB_SUCCESS)
 684                 {
 685                         status = NT_STATUS_NONE_MAPPED;
 686                         goto failed;
 687                 }
 688         }
 689
 690         ret = ldb_modify(ldb, hwm_msg);
 691         if (ret != LDB_SUCCESS) {
 692                 DEBUG(1, ("Updating the xid high water mark failed: %s\n",
 693                           ldb_errstring(ldb)));
 694                 status = NT_STATUS_NONE_MAPPED;
 695                 goto failed;
 696         }
 697
 698         map_msg = ldb_msg_new(tmp_ctx);
 699         if (map_msg == NULL) {
 700                 status = NT_STATUS_NO_MEMORY;
 701                 goto failed;
 702         }
 703
 704         map_msg->dn = ldb_dn_new_fmt(tmp_ctx, ldb, "CN=%s", sid_string.buf);
 705         if (map_msg->dn == NULL) {
 706                 status = NT_STATUS_NO_MEMORY;
 707                 goto failed;
 708         }
 709
 710         ret = ldb_msg_add_string(map_msg, "xidNumber", unixid_string);
 711         if (ret != LDB_SUCCESS) {
 712                 status = NT_STATUS_NONE_MAPPED;
 713                 goto failed;
 714         }
 715
 716         ret = idmap_msg_add_dom_sid(idmap_ctx, tmp_ctx, map_msg, "objectSid",
 717                         sid);
 718         if (ret != LDB_SUCCESS) {
 719                 status = NT_STATUS_NONE_MAPPED;
 720                 goto failed;
 721         }
 722
 723         ret = ldb_msg_add_string(map_msg, "objectClass", "sidMap");
 724         if (ret != LDB_SUCCESS) {
 725                 status = NT_STATUS_NONE_MAPPED;
 726                 goto failed;
 727         }
 728
 729         ret = ldb_msg_add_string(map_msg, "type", "ID_TYPE_BOTH");
 730         if (ret != LDB_SUCCESS) {
 731                 status = NT_STATUS_NONE_MAPPED;
 732                 goto failed;
 733         }
 734
 735         ret = ldb_msg_add_string(map_msg, "cn", sid_string.buf);
 736         if (ret != LDB_SUCCESS) {
 737                 status = NT_STATUS_NONE_MAPPED;
 738                 goto failed;
 739         }
 740
 741         ret = ldb_add(ldb, map_msg);
 742         if (ret != LDB_SUCCESS) {
 743                 DEBUG(1, ("Adding a sidmap failed: %s\n", ldb_errstring(ldb)));
 744                 status = NT_STATUS_NONE_MAPPED;
 745                 goto failed;
 746         }
 747
 748         trans = ldb_transaction_commit(ldb);
 749         if (trans != LDB_SUCCESS) {
 750                 DEBUG(1, ("Transaction failed: %s\n", ldb_errstring(ldb)));
 751                 status = NT_STATUS_NONE_MAPPED;
 752                 goto failed;
 753         }
 754
 755         unixid->id = new_xid;
 756         unixid->type = ID_TYPE_BOTH;
 757         talloc_free(tmp_ctx);
 758         return NT_STATUS_OK;
 759
 760 failed:
 761         if (trans == LDB_SUCCESS) ldb_transaction_cancel(ldb);
 762         talloc_free(tmp_ctx);
 763         return status;
 764 }
 765
 766 /**
 767  * Convert an array of unixids to the corresponding array of SIDs
 768  *
 769  * \param idmap_ctx idmap context to use
 770  * \param mem_ctx talloc context the memory for the dom_sids is allocated
 771  * from.
 772  * \param count length of id_mapping array.
 773  * \param id array of id_mappings.
 774  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping is not
 775  * possible at all, NT_STATUS_SOME_UNMAPPED if some mappings worked and some
 776  * did not.
 777  */
 778
 779 NTSTATUS idmap_xids_to_sids(struct idmap_context *idmap_ctx,
 780                             TALLOC_CTX *mem_ctx,
 781                             struct id_map **id)
 782 {
 783         unsigned int i, error_count = 0;
 784         NTSTATUS status;
 785
 786         for (i = 0; id && id[i]; i++) {
 787                 status = idmap_xid_to_sid(idmap_ctx, mem_ctx,
 788                                                 &id[i]->xid, &id[i]->sid);
 789                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 790                         status = idmap_xid_to_sid(idmap_ctx, mem_ctx,
 791                                                         &id[i]->xid,
 792                                                         &id[i]->sid);
 793                 }
 794                 if (!NT_STATUS_IS_OK(status)) {
 795                         DEBUG(1, ("idmapping xid_to_sid failed for id[%d]=%lu: %s\n",
 796                                   i, (unsigned long)id[i]->xid.id, nt_errstr(status)));
 797                         error_count++;
 798                         id[i]->status = ID_UNMAPPED;
 799                 } else {
 800                         id[i]->status = ID_MAPPED;
 801                 }
 802         }
 803
 804         if (error_count == i) {
 805                 /* Mapping did not work at all. */
 806                 return NT_STATUS_NONE_MAPPED;
 807         } else if (error_count > 0) {
 808                 /* Some mappings worked, some did not. */
 809                 return STATUS_SOME_UNMAPPED;
 810         } else {
 811                 return NT_STATUS_OK;
 812         }
 813 }
 814
 815 /**
 816  * Convert an array of SIDs to the corresponding array of unixids
 817  *
 818  * \param idmap_ctx idmap context to use
 819  * \param mem_ctx talloc context the memory for the unixids is allocated
 820  * from.
 821  * \param count length of id_mapping array.
 822  * \param id array of id_mappings.
 823  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping is not
 824  * possible at all, NT_STATUS_SOME_UNMAPPED if some mappings worked and some
 825  * did not.
 826  */
 827
 828 NTSTATUS idmap_sids_to_xids(struct idmap_context *idmap_ctx,
 829                             TALLOC_CTX *mem_ctx,
 830                             struct id_map **id)
 831 {
 832         unsigned int i, error_count = 0;
 833         NTSTATUS status;
 834
 835         for (i = 0; id && id[i]; i++) {
 836                 status = idmap_sid_to_xid(idmap_ctx, mem_ctx,
 837                                           id[i]->sid, &id[i]->xid);
 838                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 839                         status = idmap_sid_to_xid(idmap_ctx, mem_ctx,
 840                                                   id[i]->sid,
 841                                                   &id[i]->xid);
 842                 }
 843                 if (!NT_STATUS_IS_OK(status)) {
 844                         struct dom_sid_buf buf;
 845                         DEBUG(1, ("idmapping sid_to_xid failed for id[%d]=%s: %s\n",
 846                                   i,
 847                                   dom_sid_str_buf(id[i]->sid, &buf),
 848                                   nt_errstr(status)));
 849                         error_count++;
 850                         id[i]->status = ID_UNMAPPED;
 851                 } else {
 852                         id[i]->status = ID_MAPPED;
 853                 }
 854         }
 855
 856         if (error_count == i) {
 857                 /* Mapping did not work at all. */
 858                 return NT_STATUS_NONE_MAPPED;
 859         } else if (error_count > 0) {
 860                 /* Some mappings worked, some did not. */
 861                 return STATUS_SOME_UNMAPPED;
 862         } else {
 863                 return NT_STATUS_OK;
 864         }
 865 }
 866