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 "libcli/security/session.h"
  27 #include "param/param.h"
  28 #include "auth/session.h"
  29
  30 int drsuapi_search_with_extended_dn(struct ldb_context *ldb,
  31                                     TALLOC_CTX *mem_ctx,
  32                                     struct ldb_result **_res,
  33                                     struct ldb_dn *basedn,
  34                                     enum ldb_scope scope,
  35                                     const char * const *attrs,
  36                                     const char *filter)
  37 {
  38         int ret;
  39         struct ldb_request *req;
  40         TALLOC_CTX *tmp_ctx;
  41         struct ldb_result *res;
  42
  43         tmp_ctx = talloc_new(mem_ctx);
  44
  45         res = talloc_zero(tmp_ctx, struct ldb_result);
  46         if (!res) {
  47                 return LDB_ERR_OPERATIONS_ERROR;
  48         }
  49
  50         ret = ldb_build_search_req(&req, ldb, tmp_ctx,
  51                                    basedn,
  52                                    scope,
  53                                    filter,
  54                                    attrs,
  55                                    NULL,
  56                                    res,
  57                                    ldb_search_default_callback,
  58                                    NULL);
  59         if (ret != LDB_SUCCESS) {
  60                 talloc_free(tmp_ctx);
  61                 return ret;
  62         }
  63
  64         ret = ldb_request_add_control(req, LDB_CONTROL_EXTENDED_DN_OID, true, NULL);
  65         if (ret != LDB_SUCCESS) {
  66                 return ret;
  67         }
  68
  69         ret = ldb_request_add_control(req, LDB_CONTROL_SHOW_RECYCLED_OID, true, NULL);
  70         if (ret != LDB_SUCCESS) {
  71                 return ret;
  72         }
  73
  74         ret = ldb_request_add_control(req, LDB_CONTROL_REVEAL_INTERNALS, false, NULL);
  75         if (ret != LDB_SUCCESS) {
  76                 return ret;
  77         }
  78
  79         ret = ldb_request(ldb, req);
  80         if (ret == LDB_SUCCESS) {
  81                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
  82         }
  83
  84         talloc_free(req);
  85         *_res = talloc_steal(mem_ctx, res);
  86         return ret;
  87 }
  88
  89 WERROR drs_security_level_check(struct dcesrv_call_state *dce_call,
  90                                 const char* call,
  91                                 enum security_user_level minimum_level,
  92                                 const struct dom_sid *domain_sid)
  93 {
  94         enum security_user_level level;
  95
  96         if (lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL,
  97                          "drs", "disable_sec_check", false)) {
  98                 return WERR_OK;
  99         }
 100
 101         level = security_session_user_level(dce_call->conn->auth_state.session_info, domain_sid);
 102         if (level < minimum_level) {
 103                 if (call) {
 104                         DEBUG(0,("%s refused for security token (level=%u)\n",
 105                                  call, (unsigned)level));
 106                         security_token_debug(0, 2, dce_call->conn->auth_state.session_info->security_token);
 107                 }
 108                 return WERR_DS_DRA_ACCESS_DENIED;
 109         }
 110
 111         return WERR_OK;
 112 }
 113
 114 void drsuapi_process_secret_attribute(struct drsuapi_DsReplicaAttribute *attr,
 115                                       struct drsuapi_DsReplicaMetaData *meta_data)
 116 {
 117         if (attr->value_ctr.num_values == 0) {
 118                 return;
 119         }
 120
 121         switch (attr->attid) {
 122         case DRSUAPI_ATTRIBUTE_dBCSPwd:
 123         case DRSUAPI_ATTRIBUTE_unicodePwd:
 124         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 125         case DRSUAPI_ATTRIBUTE_lmPwdHistory:
 126         case DRSUAPI_ATTRIBUTE_supplementalCredentials:
 127         case DRSUAPI_ATTRIBUTE_priorValue:
 128         case DRSUAPI_ATTRIBUTE_currentValue:
 129         case DRSUAPI_ATTRIBUTE_trustAuthOutgoing:
 130         case DRSUAPI_ATTRIBUTE_trustAuthIncoming:
 131         case DRSUAPI_ATTRIBUTE_initialAuthOutgoing:
 132         case DRSUAPI_ATTRIBUTE_initialAuthIncoming:
 133                 /*set value to null*/
 134                 attr->value_ctr.num_values = 0;
 135                 talloc_free(attr->value_ctr.values);
 136                 attr->value_ctr.values = NULL;
 137                 meta_data->originating_change_time = 0;
 138                 return;
 139         default:
 140                 return;
 141         }
 142 }
 143
 144
 145 /*
 146   check security on a DN, with logging of errors
 147  */
 148 static WERROR drs_security_access_check_log(struct ldb_context *sam_ctx,
 149                                             TALLOC_CTX *mem_ctx,
 150                                             struct security_token *token,
 151                                             struct ldb_dn *dn,
 152                                             const char *ext_right)
 153 {
 154         int ret;
 155         if (!dn) {
 156                 DEBUG(3,("drs_security_access_check: Null dn provided, access is denied for %s\n",
 157                               ext_right));
 158                 return WERR_DS_DRA_ACCESS_DENIED;
 159         }
 160         ret = dsdb_check_access_on_dn(sam_ctx,
 161                                       mem_ctx,
 162                                       dn,
 163                                       token,
 164                                       SEC_ADS_CONTROL_ACCESS,
 165                                       ext_right);
 166         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 167                 DEBUG(3,("%s refused for security token on %s\n",
 168                          ext_right, ldb_dn_get_linearized(dn)));
 169                 security_token_debug(2, 0, token);
 170                 return WERR_DS_DRA_ACCESS_DENIED;
 171         } else if (ret != LDB_SUCCESS) {
 172                 DEBUG(1,("Failed to perform access check on %s\n", ldb_dn_get_linearized(dn)));
 173                 return WERR_DS_DRA_INTERNAL_ERROR;
 174         }
 175         return WERR_OK;
 176 }
 177
 178
 179 /*
 180   check security on a object identifier
 181  */
 182 WERROR drs_security_access_check(struct ldb_context *sam_ctx,
 183                                  TALLOC_CTX *mem_ctx,
 184                                  struct security_token *token,
 185                                  struct drsuapi_DsReplicaObjectIdentifier *nc,
 186                                  const char *ext_right)
 187 {
 188         struct ldb_dn *dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 189         WERROR werr;
 190         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, dn, ext_right);
 191         talloc_free(dn);
 192         return werr;
 193 }
 194
 195 /*
 196   check security on the NC root of a object identifier
 197  */
 198 WERROR drs_security_access_check_nc_root(struct ldb_context *sam_ctx,
 199                                          TALLOC_CTX *mem_ctx,
 200                                          struct security_token *token,
 201                                          struct drsuapi_DsReplicaObjectIdentifier *nc,
 202                                          const char *ext_right)
 203 {
 204         struct ldb_dn *dn, *nc_root;
 205         WERROR werr;
 206         int ret;
 207
 208         dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 209         W_ERROR_HAVE_NO_MEMORY(dn);
 210         ret = dsdb_find_nc_root(sam_ctx, dn, dn, &nc_root);
 211         if (ret != LDB_SUCCESS) {
 212                 return WERR_DS_CANT_FIND_EXPECTED_NC;
 213         }
 214         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, nc_root, ext_right);
 215         talloc_free(dn);
 216         return werr;
 217 }