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 <ldb.h>
  27 #include "ldb_wrap.h"
  28 #include "param/param.h"
  29 #include "winbind/idmap.h"
  30 #include "libcli/security/security.h"
  31 #include "libcli/ldap/ldap_ndr.h"
  32 #include "dsdb/samdb/samdb.h"
  33 #include "../libds/common/flags.h"
  34
  35 /**
  36  * Get uid/gid bounds from idmap database
  37  *
  38  * \param idmap_ctx idmap context to use
  39  * \param low lower uid/gid bound is stored here
  40  * \param high upper uid/gid bound is stored here
  41  * \return 0 on success, nonzero on failure
  42  */
  43 static int idmap_get_bounds(struct idmap_context *idmap_ctx, uint32_t *low,
  44                 uint32_t *high)
  45 {
  46         int ret = -1;
  47         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
  48         struct ldb_dn *dn;
  49         struct ldb_result *res = NULL;
  50         TALLOC_CTX *tmp_ctx = talloc_new(idmap_ctx);
  51         uint32_t lower_bound = (uint32_t) -1;
  52         uint32_t upper_bound = (uint32_t) -1;
  53
  54         dn = ldb_dn_new(tmp_ctx, ldb, "CN=CONFIG");
  55         if (dn == NULL) goto failed;
  56
  57         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
  58         if (ret != LDB_SUCCESS) goto failed;
  59
  60         if (res->count != 1) {
  61                 ret = -1;
  62                 goto failed;
  63         }
  64
  65         lower_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "lowerBound", -1);
  66         if (lower_bound != (uint32_t) -1) {
  67                 ret = LDB_SUCCESS;
  68         } else {
  69                 ret = -1;
  70                 goto failed;
  71         }
  72
  73         upper_bound = ldb_msg_find_attr_as_uint(res->msgs[0], "upperBound", -1);
  74         if (upper_bound != (uint32_t) -1) {
  75                 ret = LDB_SUCCESS;
  76         } else {
  77                 ret = -1;
  78         }
  79
  80 failed:
  81         talloc_free(tmp_ctx);
  82         *low  = lower_bound;
  83         *high = upper_bound;
  84         return ret;
  85 }
  86
  87 /**
  88  * Add a dom_sid structure to a ldb_message
  89  * \param idmap_ctx idmap context to use
  90  * \param mem_ctx talloc context to use
  91  * \param ldb_message ldb message to add dom_sid to
  92  * \param attr_name name of the attribute to store the dom_sid in
  93  * \param sid dom_sid to store
  94  * \return 0 on success, an ldb error code on failure.
  95  */
  96 static int idmap_msg_add_dom_sid(struct idmap_context *idmap_ctx,
  97                 TALLOC_CTX *mem_ctx, struct ldb_message *msg,
  98                 const char *attr_name, const struct dom_sid *sid)
  99 {
 100         struct ldb_val val;
 101         enum ndr_err_code ndr_err;
 102
 103         ndr_err = ndr_push_struct_blob(&val, mem_ctx, sid,
 104                                        (ndr_push_flags_fn_t)ndr_push_dom_sid);
 105
 106         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 107                 return -1;
 108         }
 109
 110         return ldb_msg_add_value(msg, attr_name, &val, NULL);
 111 }
 112
 113 /**
 114  * Get a dom_sid structure from a ldb message.
 115  *
 116  * \param mem_ctx talloc context to allocate dom_sid memory in
 117  * \param msg ldb_message to get dom_sid from
 118  * \param attr_name key that has the dom_sid as data
 119  * \return dom_sid structure on success, NULL on failure
 120  */
 121 static struct dom_sid *idmap_msg_get_dom_sid(TALLOC_CTX *mem_ctx,
 122                 struct ldb_message *msg, const char *attr_name)
 123 {
 124         struct dom_sid *sid;
 125         const struct ldb_val *val;
 126         enum ndr_err_code ndr_err;
 127
 128         val = ldb_msg_find_ldb_val(msg, attr_name);
 129         if (val == NULL) {
 130                 return NULL;
 131         }
 132
 133         sid = talloc(mem_ctx, struct dom_sid);
 134         if (sid == NULL) {
 135                 return NULL;
 136         }
 137
 138         ndr_err = ndr_pull_struct_blob(val, sid, sid,
 139                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 140         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 141                 talloc_free(sid);
 142                 return NULL;
 143         }
 144
 145         return sid;
 146 }
 147
 148 /**
 149  * Initialize idmap context
 150  *
 151  * talloc_free to close.
 152  *
 153  * \param mem_ctx talloc context to use.
 154  * \return allocated idmap_context on success, NULL on error
 155  */
 156 struct idmap_context *idmap_init(TALLOC_CTX *mem_ctx,
 157                                  struct tevent_context *ev_ctx,
 158                                  struct loadparm_context *lp_ctx)
 159 {
 160         struct idmap_context *idmap_ctx;
 161
 162         idmap_ctx = talloc(mem_ctx, struct idmap_context);
 163         if (idmap_ctx == NULL) {
 164                 return NULL;
 165         }
 166
 167         idmap_ctx->lp_ctx = lp_ctx;
 168
 169         idmap_ctx->ldb_ctx = ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx,
 170                                               "idmap.ldb",
 171                                               system_session(lp_ctx),
 172                                               NULL, 0);
 173         if (idmap_ctx->ldb_ctx == NULL) {
 174                 return NULL;
 175         }
 176
 177         idmap_ctx->unix_groups_sid = dom_sid_parse_talloc(mem_ctx, "S-1-22-2");
 178         if (idmap_ctx->unix_groups_sid == NULL) {
 179                 return NULL;
 180         }
 181
 182         idmap_ctx->unix_users_sid = dom_sid_parse_talloc(mem_ctx, "S-1-22-1");
 183         if (idmap_ctx->unix_users_sid == NULL) {
 184                 return NULL;
 185         }
 186
 187         idmap_ctx->samdb = samdb_connect(idmap_ctx, ev_ctx, lp_ctx, system_session(lp_ctx), 0);
 188         if (idmap_ctx->samdb == NULL) {
 189                 DEBUG(0, ("Failed to load sam.ldb in idmap_init\n"));
 190                 return NULL;
 191         }
 192
 193         return idmap_ctx;
 194 }
 195
 196 /**
 197  * Convert an unixid to the corresponding SID
 198  *
 199  * \param idmap_ctx idmap context to use
 200  * \param mem_ctx talloc context the memory for the struct dom_sid is allocated
 201  * from.
 202  * \param unixid pointer to a unixid struct to convert
 203  * \param sid pointer that will take the struct dom_sid pointer if the mapping
 204  * succeeds.
 205  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping not
 206  * possible or some other NTSTATUS that is more descriptive on failure.
 207  */
 208
 209 static NTSTATUS idmap_xid_to_sid(struct idmap_context *idmap_ctx,
 210                                  TALLOC_CTX *mem_ctx,
 211                                  struct unixid *unixid,
 212                                  struct dom_sid **sid)
 213 {
 214         int ret;
 215         NTSTATUS status = NT_STATUS_NONE_MAPPED;
 216         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
 217         struct ldb_result *res = NULL;
 218         struct ldb_message *msg;
 219         struct dom_sid *unix_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 = dom_sid_parse_talloc(tmp_ctx, "S-1-22-1");
 358         } else {
 359                 unix_sid = dom_sid_parse_talloc(tmp_ctx, "S-1-22-2");
 360         }
 361         if (unix_sid == NULL) {
 362                 status = NT_STATUS_NO_MEMORY;
 363                 goto failed;
 364         }
 365
 366         new_sid = dom_sid_add_rid(mem_ctx, unix_sid, unixid->id);
 367         if (new_sid == NULL) {
 368                 status = NT_STATUS_NO_MEMORY;
 369                 goto failed;
 370         }
 371
 372         *sid = new_sid;
 373         talloc_free(tmp_ctx);
 374         return NT_STATUS_OK;
 375
 376 failed:
 377         talloc_free(tmp_ctx);
 378         return status;
 379 }
 380
 381
 382 /**
 383  * Map a SID to an unixid struct.
 384  *
 385  * If no mapping exists, a new mapping will be created.
 386  *
 387  * \param idmap_ctx idmap context to use
 388  * \param mem_ctx talloc context to use
 389  * \param sid SID to map to an unixid struct
 390  * \param unixid pointer to a unixid struct
 391  * \return NT_STATUS_OK on success, NT_STATUS_INVALID_SID if the sid is not from
 392  * a trusted domain and idmap trusted only = true, NT_STATUS_NONE_MAPPED if the
 393  * mapping failed.
 394  */
 395 static NTSTATUS idmap_sid_to_xid(struct idmap_context *idmap_ctx,
 396                                  TALLOC_CTX *mem_ctx,
 397                                  const struct dom_sid *sid,
 398                                  struct unixid *unixid)
 399 {
 400         int ret;
 401         NTSTATUS status = NT_STATUS_NONE_MAPPED;
 402         struct ldb_context *ldb = idmap_ctx->ldb_ctx;
 403         struct ldb_dn *dn;
 404         struct ldb_message *hwm_msg, *map_msg, *sam_msg;
 405         struct ldb_result *res = NULL;
 406         int trans = -1;
 407         uint32_t low, high, hwm, new_xid;
 408         char *sid_string, *unixid_string, *hwm_string;
 409         bool hwm_entry_exists;
 410         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 411         const char *sam_attrs[] = {"uidNumber", "gidNumber", "samAccountType", NULL};
 412
 413         if (dom_sid_in_domain(idmap_ctx->unix_users_sid, sid)) {
 414                 uint32_t rid;
 415                 DEBUG(6, ("This is a local unix uid, just calculate that.\n"));
 416                 status = dom_sid_split_rid(tmp_ctx, sid, NULL, &rid);
 417                 if (!NT_STATUS_IS_OK(status)) {
 418                         talloc_free(tmp_ctx);
 419                         return status;
 420                 }
 421
 422                 unixid->id = rid;
 423                 unixid->type = ID_TYPE_UID;
 424
 425                 talloc_free(tmp_ctx);
 426                 return NT_STATUS_OK;
 427         }
 428
 429         if (dom_sid_in_domain(idmap_ctx->unix_groups_sid, sid)) {
 430                 uint32_t rid;
 431                 DEBUG(6, ("This is a local unix gid, just calculate that.\n"));
 432                 status = dom_sid_split_rid(tmp_ctx, sid, NULL, &rid);
 433                 if (!NT_STATUS_IS_OK(status)) {
 434                         talloc_free(tmp_ctx);
 435                         return status;
 436                 }
 437
 438                 unixid->id = rid;
 439                 unixid->type = ID_TYPE_GID;
 440
 441                 talloc_free(tmp_ctx);
 442                 return NT_STATUS_OK;
 443         }
 444
 445         /*
 446          * First check against our local DB, to see if this user has a
 447          * mapping there.  This means that the Samba4 AD DC behaves
 448          * much like a winbindd member server running idmap_ad
 449          */
 450
 451         if (lpcfg_parm_bool(idmap_ctx->lp_ctx, NULL, "idmap_ldb", "use rfc2307", false)) {
 452                 ret = dsdb_search_one(idmap_ctx->samdb, tmp_ctx, &sam_msg,
 453                                       ldb_get_default_basedn(idmap_ctx->samdb),
 454                                       LDB_SCOPE_SUBTREE, sam_attrs, 0,
 455                                       "(&(objectSid=%s)"
 456                                       "(|(sAMaccountType=%u)(sAMaccountType=%u)(sAMaccountType=%u)"
 457                                       "(sAMaccountType=%u)(sAMaccountType=%u))"
 458                                       "(|(uidNumber=*)(gidNumber=*)))",
 459                                       dom_sid_string(tmp_ctx, sid),
 460                                       ATYPE_ACCOUNT, ATYPE_WORKSTATION_TRUST, ATYPE_INTERDOMAIN_TRUST,
 461                                       ATYPE_SECURITY_GLOBAL_GROUP, ATYPE_SECURITY_LOCAL_GROUP);
 462         } else {
 463                 /* If we are not to use the rfc2307 attributes, we just emulate a non-match */
 464                 ret = LDB_ERR_NO_SUCH_OBJECT;
 465         }
 466
 467         if (ret == LDB_ERR_CONSTRAINT_VIOLATION) {
 468                 DEBUG(1, ("Search for objectSid=%s gave duplicate results, failing to map to a unix ID!\n",
 469                           dom_sid_string(tmp_ctx, sid)));
 470                 status = NT_STATUS_NONE_MAPPED;
 471                 goto failed;
 472         } else if (ret == LDB_SUCCESS) {
 473                 uint32_t account_type = ldb_msg_find_attr_as_uint(sam_msg, "sAMaccountType", 0);
 474                 if ((account_type == ATYPE_ACCOUNT) ||
 475                     (account_type == ATYPE_WORKSTATION_TRUST ) ||
 476                     (account_type == ATYPE_INTERDOMAIN_TRUST ))
 477                 {
 478                         const struct ldb_val *v = ldb_msg_find_ldb_val(sam_msg, "uidNumber");
 479                         if (v) {
 480                                 unixid->type = ID_TYPE_UID;
 481                                 unixid->id = ldb_msg_find_attr_as_uint(sam_msg, "uidNumber", -1);
 482                                 talloc_free(tmp_ctx);
 483                                 return NT_STATUS_OK;
 484                         }
 485
 486                 } else if ((account_type == ATYPE_SECURITY_GLOBAL_GROUP) ||
 487                            (account_type == ATYPE_SECURITY_LOCAL_GROUP))
 488                 {
 489                         const struct ldb_val *v = ldb_msg_find_ldb_val(sam_msg, "gidNumber");
 490                         if (v) {
 491                                 unixid->type = ID_TYPE_GID;
 492                                 unixid->id = ldb_msg_find_attr_as_uint(sam_msg, "gidNumber", -1);
 493                                 talloc_free(tmp_ctx);
 494                                 return NT_STATUS_OK;
 495                         }
 496                 }
 497         } else if (ret != LDB_ERR_NO_SUCH_OBJECT) {
 498                 DEBUG(1, ("Search for objectSid=%s gave '%s', failing to map to a SID!\n",
 499                           dom_sid_string(tmp_ctx, sid), ldb_errstring(idmap_ctx->samdb)));
 500
 501                 status = NT_STATUS_NONE_MAPPED;
 502                 goto failed;
 503         }
 504
 505         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 506                                  NULL, "(&(objectClass=sidMap)(objectSid=%s))",
 507                                  ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 508         if (ret != LDB_SUCCESS) {
 509                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 510                 talloc_free(tmp_ctx);
 511                 return NT_STATUS_NONE_MAPPED;
 512         }
 513
 514         if (res->count == 1) {
 515                 const char *type = ldb_msg_find_attr_as_string(res->msgs[0],
 516                                                                "type", NULL);
 517                 new_xid = ldb_msg_find_attr_as_uint(res->msgs[0], "xidNumber",
 518                                                     -1);
 519                 if (new_xid == (uint32_t) -1) {
 520                         DEBUG(1, ("Invalid xid mapping.\n"));
 521                         talloc_free(tmp_ctx);
 522                         return NT_STATUS_NONE_MAPPED;
 523                 }
 524
 525                 if (type == NULL) {
 526                         DEBUG(1, ("Invalid type for mapping entry.\n"));
 527                         talloc_free(tmp_ctx);
 528                         return NT_STATUS_NONE_MAPPED;
 529                 }
 530
 531                 unixid->id = new_xid;
 532
 533                 if (strcmp(type, "ID_TYPE_BOTH") == 0) {
 534                         unixid->type = ID_TYPE_BOTH;
 535                 } else if (strcmp(type, "ID_TYPE_UID") == 0) {
 536                         unixid->type = ID_TYPE_UID;
 537                 } else {
 538                         unixid->type = ID_TYPE_GID;
 539                 }
 540
 541                 talloc_free(tmp_ctx);
 542                 return NT_STATUS_OK;
 543         }
 544
 545         DEBUG(6, ("No existing mapping found, attempting to create one.\n"));
 546
 547         trans = ldb_transaction_start(ldb);
 548         if (trans != LDB_SUCCESS) {
 549                 status = NT_STATUS_NONE_MAPPED;
 550                 goto failed;
 551         }
 552
 553         /* Redo the search to make sure noone changed the mapping while we
 554          * weren't looking */
 555         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 556                                  NULL, "(&(objectClass=sidMap)(objectSid=%s))",
 557                                  ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 558         if (ret != LDB_SUCCESS) {
 559                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 560                 status = NT_STATUS_NONE_MAPPED;
 561                 goto failed;
 562         }
 563
 564         if (res->count > 0) {
 565                 DEBUG(1, ("Database changed while trying to add a sidmap.\n"));
 566                 status = NT_STATUS_RETRY;
 567                 goto failed;
 568         }
 569
 570         ret = idmap_get_bounds(idmap_ctx, &low, &high);
 571         if (ret != LDB_SUCCESS) {
 572                 status = NT_STATUS_NONE_MAPPED;
 573                 goto failed;
 574         }
 575
 576         dn = ldb_dn_new(tmp_ctx, ldb, "CN=CONFIG");
 577         if (dn == NULL) {
 578                 status = NT_STATUS_NO_MEMORY;
 579                 goto failed;
 580         }
 581
 582         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
 583         if (ret != LDB_SUCCESS) {
 584                 DEBUG(1, ("Search failed: %s\n", ldb_errstring(ldb)));
 585                 status = NT_STATUS_NONE_MAPPED;
 586                 goto failed;
 587         }
 588
 589         if (res->count != 1) {
 590                 DEBUG(1, ("No CN=CONFIG record, idmap database is broken.\n"));
 591                 status = NT_STATUS_NONE_MAPPED;
 592                 goto failed;
 593         }
 594
 595         hwm = ldb_msg_find_attr_as_uint(res->msgs[0], "xidNumber", -1);
 596         if (hwm == (uint32_t)-1) {
 597                 hwm = low;
 598                 hwm_entry_exists = false;
 599         } else {
 600                 hwm_entry_exists = true;
 601         }
 602
 603         if (hwm > high) {
 604                 DEBUG(1, ("Out of xids to allocate.\n"));
 605                 status = NT_STATUS_NONE_MAPPED;
 606                 goto failed;
 607         }
 608
 609         hwm_msg = ldb_msg_new(tmp_ctx);
 610         if (hwm_msg == NULL) {
 611                 DEBUG(1, ("Out of memory when creating ldb_message\n"));
 612                 status = NT_STATUS_NO_MEMORY;
 613                 goto failed;
 614         }
 615
 616         hwm_msg->dn = dn;
 617
 618         new_xid = hwm;
 619         hwm++;
 620
 621         hwm_string = talloc_asprintf(tmp_ctx, "%u", hwm);
 622         if (hwm_string == NULL) {
 623                 status = NT_STATUS_NO_MEMORY;
 624                 goto failed;
 625         }
 626
 627         sid_string = dom_sid_string(tmp_ctx, sid);
 628         if (sid_string == NULL) {
 629                 status = NT_STATUS_NO_MEMORY;
 630                 goto failed;
 631         }
 632
 633         unixid_string = talloc_asprintf(tmp_ctx, "%u", new_xid);
 634         if (unixid_string == NULL) {
 635                 status = NT_STATUS_NO_MEMORY;
 636                 goto failed;
 637         }
 638
 639         if (hwm_entry_exists) {
 640                 struct ldb_message_element *els;
 641                 struct ldb_val *vals;
 642
 643                 /* We're modifying the entry, not just adding a new one. */
 644                 els = talloc_array(tmp_ctx, struct ldb_message_element, 2);
 645                 if (els == NULL) {
 646                         status = NT_STATUS_NO_MEMORY;
 647                         goto failed;
 648                 }
 649
 650                 vals = talloc_array(tmp_ctx, struct ldb_val, 2);
 651                 if (els == NULL) {
 652                         status = NT_STATUS_NO_MEMORY;
 653                         goto failed;
 654                 }
 655
 656                 hwm_msg->num_elements = 2;
 657                 hwm_msg->elements = els;
 658
 659                 els[0].num_values = 1;
 660                 els[0].values = &vals[0];
 661                 els[0].flags = LDB_FLAG_MOD_DELETE;
 662                 els[0].name = talloc_strdup(tmp_ctx, "xidNumber");
 663                 if (els[0].name == NULL) {
 664                         status = NT_STATUS_NO_MEMORY;
 665                         goto failed;
 666                 }
 667
 668                 els[1].num_values = 1;
 669                 els[1].values = &vals[1];
 670                 els[1].flags = LDB_FLAG_MOD_ADD;
 671                 els[1].name = els[0].name;
 672
 673                 vals[0].data = (uint8_t *)unixid_string;
 674                 vals[0].length = strlen(unixid_string);
 675                 vals[1].data = (uint8_t *)hwm_string;
 676                 vals[1].length = strlen(hwm_string);
 677         } else {
 678                 ret = ldb_msg_add_empty(hwm_msg, "xidNumber", LDB_FLAG_MOD_ADD,
 679                                         NULL);
 680                 if (ret != LDB_SUCCESS) {
 681                         status = NT_STATUS_NONE_MAPPED;
 682                         goto failed;
 683                 }
 684
 685                 ret = ldb_msg_add_string(hwm_msg, "xidNumber", hwm_string);
 686                 if (ret != LDB_SUCCESS)
 687                 {
 688                         status = NT_STATUS_NONE_MAPPED;
 689                         goto failed;
 690                 }
 691         }
 692
 693         ret = ldb_modify(ldb, hwm_msg);
 694         if (ret != LDB_SUCCESS) {
 695                 DEBUG(1, ("Updating the xid high water mark failed: %s\n",
 696                           ldb_errstring(ldb)));
 697                 status = NT_STATUS_NONE_MAPPED;
 698                 goto failed;
 699         }
 700
 701         map_msg = ldb_msg_new(tmp_ctx);
 702         if (map_msg == NULL) {
 703                 status = NT_STATUS_NO_MEMORY;
 704                 goto failed;
 705         }
 706
 707         map_msg->dn = ldb_dn_new_fmt(tmp_ctx, ldb, "CN=%s", sid_string);
 708         if (map_msg->dn == NULL) {
 709                 status = NT_STATUS_NO_MEMORY;
 710                 goto failed;
 711         }
 712
 713         ret = ldb_msg_add_string(map_msg, "xidNumber", unixid_string);
 714         if (ret != LDB_SUCCESS) {
 715                 status = NT_STATUS_NONE_MAPPED;
 716                 goto failed;
 717         }
 718
 719         ret = idmap_msg_add_dom_sid(idmap_ctx, tmp_ctx, map_msg, "objectSid",
 720                         sid);
 721         if (ret != LDB_SUCCESS) {
 722                 status = NT_STATUS_NONE_MAPPED;
 723                 goto failed;
 724         }
 725
 726         ret = ldb_msg_add_string(map_msg, "objectClass", "sidMap");
 727         if (ret != LDB_SUCCESS) {
 728                 status = NT_STATUS_NONE_MAPPED;
 729                 goto failed;
 730         }
 731
 732         ret = ldb_msg_add_string(map_msg, "type", "ID_TYPE_BOTH");
 733         if (ret != LDB_SUCCESS) {
 734                 status = NT_STATUS_NONE_MAPPED;
 735                 goto failed;
 736         }
 737
 738         ret = ldb_msg_add_string(map_msg, "cn", sid_string);
 739         if (ret != LDB_SUCCESS) {
 740                 status = NT_STATUS_NONE_MAPPED;
 741                 goto failed;
 742         }
 743
 744         ret = ldb_add(ldb, map_msg);
 745         if (ret != LDB_SUCCESS) {
 746                 DEBUG(1, ("Adding a sidmap failed: %s\n", ldb_errstring(ldb)));
 747                 status = NT_STATUS_NONE_MAPPED;
 748                 goto failed;
 749         }
 750
 751         trans = ldb_transaction_commit(ldb);
 752         if (trans != LDB_SUCCESS) {
 753                 DEBUG(1, ("Transaction failed: %s\n", ldb_errstring(ldb)));
 754                 status = NT_STATUS_NONE_MAPPED;
 755                 goto failed;
 756         }
 757
 758         unixid->id = new_xid;
 759         unixid->type = ID_TYPE_BOTH;
 760         talloc_free(tmp_ctx);
 761         return NT_STATUS_OK;
 762
 763 failed:
 764         if (trans == LDB_SUCCESS) ldb_transaction_cancel(ldb);
 765         talloc_free(tmp_ctx);
 766         return status;
 767 }
 768
 769 /**
 770  * Convert an array of unixids to the corresponding array of SIDs
 771  *
 772  * \param idmap_ctx idmap context to use
 773  * \param mem_ctx talloc context the memory for the dom_sids is allocated
 774  * from.
 775  * \param count length of id_mapping array.
 776  * \param id array of id_mappings.
 777  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping is not
 778  * possible at all, NT_STATUS_SOME_UNMAPPED if some mappings worked and some
 779  * did not.
 780  */
 781
 782 NTSTATUS idmap_xids_to_sids(struct idmap_context *idmap_ctx,
 783                             TALLOC_CTX *mem_ctx,
 784                             struct id_map **id)
 785 {
 786         unsigned int i, error_count = 0;
 787         NTSTATUS status;
 788
 789         for (i = 0; id && id[i]; i++) {
 790                 status = idmap_xid_to_sid(idmap_ctx, mem_ctx,
 791                                                 &id[i]->xid, &id[i]->sid);
 792                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 793                         status = idmap_xid_to_sid(idmap_ctx, mem_ctx,
 794                                                         &id[i]->xid,
 795                                                         &id[i]->sid);
 796                 }
 797                 if (!NT_STATUS_IS_OK(status)) {
 798                         DEBUG(1, ("idmapping xid_to_sid failed for id[%d]=%lu: %s\n",
 799                                   i, (unsigned long)id[i]->xid.id, nt_errstr(status)));
 800                         error_count++;
 801                         id[i]->status = ID_UNMAPPED;
 802                 } else {
 803                         id[i]->status = ID_MAPPED;
 804                 }
 805         }
 806
 807         if (error_count == i) {
 808                 /* Mapping did not work at all. */
 809                 return NT_STATUS_NONE_MAPPED;
 810         } else if (error_count > 0) {
 811                 /* Some mappings worked, some did not. */
 812                 return STATUS_SOME_UNMAPPED;
 813         } else {
 814                 return NT_STATUS_OK;
 815         }
 816 }
 817
 818 /**
 819  * Convert an array of SIDs to the corresponding array of unixids
 820  *
 821  * \param idmap_ctx idmap context to use
 822  * \param mem_ctx talloc context the memory for the unixids is allocated
 823  * from.
 824  * \param count length of id_mapping array.
 825  * \param id array of id_mappings.
 826  * \return NT_STATUS_OK on success, NT_STATUS_NONE_MAPPED if mapping is not
 827  * possible at all, NT_STATUS_SOME_UNMAPPED if some mappings worked and some
 828  * did not.
 829  */
 830
 831 NTSTATUS idmap_sids_to_xids(struct idmap_context *idmap_ctx,
 832                             TALLOC_CTX *mem_ctx,
 833                             struct id_map **id)
 834 {
 835         unsigned int i, error_count = 0;
 836         NTSTATUS status;
 837
 838         for (i = 0; id && id[i]; i++) {
 839                 status = idmap_sid_to_xid(idmap_ctx, mem_ctx,
 840                                           id[i]->sid, &id[i]->xid);
 841                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 842                         status = idmap_sid_to_xid(idmap_ctx, mem_ctx,
 843                                                   id[i]->sid,
 844                                                   &id[i]->xid);
 845                 }
 846                 if (!NT_STATUS_IS_OK(status)) {
 847                         char *str = dom_sid_string(mem_ctx, id[i]->sid);
 848                         DEBUG(1, ("idmapping sid_to_xid failed for id[%d]=%s: %s\n",
 849                                   i, str, nt_errstr(status)));
 850                         talloc_free(str);
 851                         error_count++;
 852                         id[i]->status = ID_UNMAPPED;
 853                 } else {
 854                         id[i]->status = ID_MAPPED;
 855                 }
 856         }
 857
 858         if (error_count == i) {
 859                 /* Mapping did not work at all. */
 860                 return NT_STATUS_NONE_MAPPED;
 861         } else if (error_count > 0) {
 862                 /* Some mappings worked, some did not. */
 863                 return STATUS_SOME_UNMAPPED;
 864         } else {
 865                 return NT_STATUS_OK;
 866         }
 867 }
 868