source4/rpc_server/drsuapi/drsutil.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    useful utilities for the DRS server
   5
   6    Copyright (C) Andrew Tridgell 2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "rpc_server/dcerpc_server.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "libcli/security/security.h"
  26 #include "param/param.h"
  27 #include "auth/session.h"
  28
  29 int drsuapi_search_with_extended_dn(struct ldb_context *ldb,
  30                                     TALLOC_CTX *mem_ctx,
  31                                     struct ldb_result **_res,
  32                                     struct ldb_dn *basedn,
  33                                     enum ldb_scope scope,
  34                                     const char * const *attrs,
  35                                     const char *filter)
  36 {
  37         int ret;
  38         struct ldb_request *req;
  39         TALLOC_CTX *tmp_ctx;
  40         struct ldb_result *res;
  41
  42         tmp_ctx = talloc_new(mem_ctx);
  43
  44         res = talloc_zero(tmp_ctx, struct ldb_result);
  45         if (!res) {
  46                 return LDB_ERR_OPERATIONS_ERROR;
  47         }
  48
  49         ret = ldb_build_search_req(&req, ldb, tmp_ctx,
  50                                    basedn,
  51                                    scope,
  52                                    filter,
  53                                    attrs,
  54                                    NULL,
  55                                    res,
  56                                    ldb_search_default_callback,
  57                                    NULL);
  58         if (ret != LDB_SUCCESS) {
  59                 talloc_free(tmp_ctx);
  60                 return ret;
  61         }
  62
  63         ret = ldb_request_add_control(req, LDB_CONTROL_EXTENDED_DN_OID, true, NULL);
  64         if (ret != LDB_SUCCESS) {
  65                 return ret;
  66         }
  67
  68         ret = ldb_request_add_control(req, LDB_CONTROL_SHOW_RECYCLED_OID, true, NULL);
  69         if (ret != LDB_SUCCESS) {
  70                 return ret;
  71         }
  72
  73         ret = ldb_request_add_control(req, LDB_CONTROL_REVEAL_INTERNALS, false, NULL);
  74         if (ret != LDB_SUCCESS) {
  75                 return ret;
  76         }
  77
  78         ret = ldb_request(ldb, req);
  79         if (ret == LDB_SUCCESS) {
  80                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
  81         }
  82
  83         talloc_free(req);
  84         *_res = talloc_steal(mem_ctx, res);
  85         return ret;
  86 }
  87
  88 WERROR drs_security_level_check(struct dcesrv_call_state *dce_call,
  89                                 const char* call,
  90                                 enum security_user_level minimum_level,
  91                                 const struct dom_sid *domain_sid)
  92 {
  93         enum security_user_level level;
  94
  95         if (lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL,
  96                          "drs", "disable_sec_check", false)) {
  97                 return WERR_OK;
  98         }
  99
 100         level = security_session_user_level(dce_call->conn->auth_state.session_info, domain_sid);
 101         if (level < minimum_level) {
 102                 if (call) {
 103                         DEBUG(0,("%s refused for security token (level=%u)\n",
 104                                  call, (unsigned)level));
 105                         security_token_debug(2, dce_call->conn->auth_state.session_info->security_token);
 106                 }
 107                 return WERR_DS_DRA_ACCESS_DENIED;
 108         }
 109
 110         return WERR_OK;
 111 }
 112
 113 void drsuapi_process_secret_attribute(struct drsuapi_DsReplicaAttribute *attr,
 114                                       struct drsuapi_DsReplicaMetaData *meta_data)
 115 {
 116         if (attr->value_ctr.num_values == 0) {
 117                 return;
 118         }
 119
 120         switch (attr->attid) {
 121         case DRSUAPI_ATTRIBUTE_dBCSPwd:
 122         case DRSUAPI_ATTRIBUTE_unicodePwd:
 123         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 124         case DRSUAPI_ATTRIBUTE_lmPwdHistory:
 125         case DRSUAPI_ATTRIBUTE_supplementalCredentials:
 126         case DRSUAPI_ATTRIBUTE_priorValue:
 127         case DRSUAPI_ATTRIBUTE_currentValue:
 128         case DRSUAPI_ATTRIBUTE_trustAuthOutgoing:
 129         case DRSUAPI_ATTRIBUTE_trustAuthIncoming:
 130         case DRSUAPI_ATTRIBUTE_initialAuthOutgoing:
 131         case DRSUAPI_ATTRIBUTE_initialAuthIncoming:
 132                 /*set value to null*/
 133                 attr->value_ctr.num_values = 0;
 134                 talloc_free(attr->value_ctr.values);
 135                 attr->value_ctr.values = NULL;
 136                 meta_data->originating_change_time = 0;
 137                 return;
 138         default:
 139                 return;
 140         }
 141 }
 142
 143
 144 /*
 145   check security on a DN, with logging of errors
 146  */
 147 static WERROR drs_security_access_check_log(struct ldb_context *sam_ctx,
 148                                             TALLOC_CTX *mem_ctx,
 149                                             struct security_token *token,
 150                                             struct ldb_dn *dn,
 151                                             const char *ext_right)
 152 {
 153         int ret;
 154         if (!dn) {
 155                 DEBUG(3,("drs_security_access_check: Null dn provided, access is denied for %s\n",
 156                               ext_right));
 157                 return WERR_DS_DRA_ACCESS_DENIED;
 158         }
 159         ret = dsdb_check_access_on_dn(sam_ctx,
 160                                       mem_ctx,
 161                                       dn,
 162                                       token,
 163                                       SEC_ADS_CONTROL_ACCESS,
 164                                       ext_right);
 165         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 166                 DEBUG(3,("%s refused for security token on %s\n",
 167                          ext_right, ldb_dn_get_linearized(dn)));
 168                 security_token_debug(2, token);
 169                 return WERR_DS_DRA_ACCESS_DENIED;
 170         } else if (ret != LDB_SUCCESS) {
 171                 DEBUG(1,("Failed to perform access check on %s\n", ldb_dn_get_linearized(dn)));
 172                 return WERR_DS_DRA_INTERNAL_ERROR;
 173         }
 174         return WERR_OK;
 175 }
 176
 177
 178 /*
 179   check security on a object identifier
 180  */
 181 WERROR drs_security_access_check(struct ldb_context *sam_ctx,
 182                                  TALLOC_CTX *mem_ctx,
 183                                  struct security_token *token,
 184                                  struct drsuapi_DsReplicaObjectIdentifier *nc,
 185                                  const char *ext_right)
 186 {
 187         struct ldb_dn *dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 188         WERROR werr;
 189         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, dn, ext_right);
 190         talloc_free(dn);
 191         return werr;
 192 }
 193
 194 /*
 195   check security on the NC root of a object identifier
 196  */
 197 WERROR drs_security_access_check_nc_root(struct ldb_context *sam_ctx,
 198                                          TALLOC_CTX *mem_ctx,
 199                                          struct security_token *token,
 200                                          struct drsuapi_DsReplicaObjectIdentifier *nc,
 201                                          const char *ext_right)
 202 {
 203         struct ldb_dn *dn, *nc_root;
 204         WERROR werr;
 205         int ret;
 206
 207         dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 208         W_ERROR_HAVE_NO_MEMORY(dn);
 209         ret = dsdb_find_nc_root(sam_ctx, dn, dn, &nc_root);
 210         if (ret != LDB_SUCCESS) {
 211                 return WERR_DS_CANT_FIND_EXPECTED_NC;
 212         }
 213         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, nc_root, ext_right);
 214         talloc_free(dn);
 215         return werr;
 216 }