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 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS            DBGC_DRS_REPL
  33
  34 int drsuapi_search_with_extended_dn(struct ldb_context *ldb,
  35                                     TALLOC_CTX *mem_ctx,
  36                                     struct ldb_result **_res,
  37                                     struct ldb_dn *basedn,
  38                                     enum ldb_scope scope,
  39                                     const char * const *attrs,
  40                                     const char *filter)
  41 {
  42         int ret;
  43         struct ldb_request *req;
  44         TALLOC_CTX *tmp_ctx;
  45         struct ldb_result *res;
  46
  47         tmp_ctx = talloc_new(mem_ctx);
  48
  49         res = talloc_zero(tmp_ctx, struct ldb_result);
  50         if (!res) {
  51                 return LDB_ERR_OPERATIONS_ERROR;
  52         }
  53
  54         ret = ldb_build_search_req(&req, ldb, tmp_ctx,
  55                                    basedn,
  56                                    scope,
  57                                    filter,
  58                                    attrs,
  59                                    NULL,
  60                                    res,
  61                                    ldb_search_default_callback,
  62                                    NULL);
  63         if (ret != LDB_SUCCESS) {
  64                 talloc_free(tmp_ctx);
  65                 return ret;
  66         }
  67
  68         ret = ldb_request_add_control(req, LDB_CONTROL_EXTENDED_DN_OID, true, NULL);
  69         if (ret != LDB_SUCCESS) {
  70                 return ret;
  71         }
  72
  73         ret = ldb_request_add_control(req, LDB_CONTROL_SHOW_RECYCLED_OID, true, NULL);
  74         if (ret != LDB_SUCCESS) {
  75                 return ret;
  76         }
  77
  78         ret = ldb_request_add_control(req, LDB_CONTROL_REVEAL_INTERNALS, false, NULL);
  79         if (ret != LDB_SUCCESS) {
  80                 return ret;
  81         }
  82
  83         ret = ldb_request(ldb, req);
  84         if (ret == LDB_SUCCESS) {
  85                 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
  86         }
  87
  88         talloc_free(req);
  89         *_res = talloc_steal(mem_ctx, res);
  90         return ret;
  91 }
  92
  93 WERROR drs_security_level_check(struct dcesrv_call_state *dce_call,
  94                                 const char* call,
  95                                 enum security_user_level minimum_level,
  96                                 const struct dom_sid *domain_sid)
  97 {
  98         enum security_user_level level;
  99
 100         if (lpcfg_parm_bool(dce_call->conn->dce_ctx->lp_ctx, NULL,
 101                          "drs", "disable_sec_check", false)) {
 102                 return WERR_OK;
 103         }
 104
 105         level = security_session_user_level(dce_call->conn->auth_state.session_info, domain_sid);
 106         if (level < minimum_level) {
 107                 if (call) {
 108                         DEBUG(0,("%s refused for security token (level=%u)\n",
 109                                  call, (unsigned)level));
 110                         security_token_debug(DBGC_DRS_REPL, 2, dce_call->conn->auth_state.session_info->security_token);
 111                 }
 112                 return WERR_DS_DRA_ACCESS_DENIED;
 113         }
 114
 115         return WERR_OK;
 116 }
 117
 118 void drsuapi_process_secret_attribute(struct drsuapi_DsReplicaAttribute *attr,
 119                                       struct drsuapi_DsReplicaMetaData *meta_data)
 120 {
 121         if (attr->value_ctr.num_values == 0) {
 122                 return;
 123         }
 124
 125         switch (attr->attid) {
 126         case DRSUAPI_ATTID_dBCSPwd:
 127         case DRSUAPI_ATTID_unicodePwd:
 128         case DRSUAPI_ATTID_ntPwdHistory:
 129         case DRSUAPI_ATTID_lmPwdHistory:
 130         case DRSUAPI_ATTID_supplementalCredentials:
 131         case DRSUAPI_ATTID_priorValue:
 132         case DRSUAPI_ATTID_currentValue:
 133         case DRSUAPI_ATTID_trustAuthOutgoing:
 134         case DRSUAPI_ATTID_trustAuthIncoming:
 135         case DRSUAPI_ATTID_initialAuthOutgoing:
 136         case DRSUAPI_ATTID_initialAuthIncoming:
 137                 /*set value to null*/
 138                 attr->value_ctr.num_values = 0;
 139                 talloc_free(attr->value_ctr.values);
 140                 attr->value_ctr.values = NULL;
 141                 meta_data->originating_change_time = 0;
 142                 return;
 143         default:
 144                 return;
 145         }
 146 }
 147
 148
 149 /*
 150   check security on a DN, with logging of errors
 151  */
 152 static WERROR drs_security_access_check_log(struct ldb_context *sam_ctx,
 153                                             TALLOC_CTX *mem_ctx,
 154                                             struct security_token *token,
 155                                             struct ldb_dn *dn,
 156                                             const char *ext_right)
 157 {
 158         int ret;
 159         if (!dn) {
 160                 DEBUG(3,("drs_security_access_check: Null dn provided, access is denied for %s\n",
 161                               ext_right));
 162                 return WERR_DS_DRA_ACCESS_DENIED;
 163         }
 164         ret = dsdb_check_access_on_dn(sam_ctx,
 165                                       mem_ctx,
 166                                       dn,
 167                                       token,
 168                                       SEC_ADS_CONTROL_ACCESS,
 169                                       ext_right);
 170         if (ret == LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS) {
 171                 DEBUG(3,("%s refused for security token on %s\n",
 172                          ext_right, ldb_dn_get_linearized(dn)));
 173                 security_token_debug(DBGC_DRS_REPL, 3, token);
 174                 return WERR_DS_DRA_ACCESS_DENIED;
 175         } else if (ret != LDB_SUCCESS) {
 176                 DEBUG(1,("Failed to perform access check on %s: %s\n", ldb_dn_get_linearized(dn), ldb_strerror(ret)));
 177                 return WERR_DS_DRA_INTERNAL_ERROR;
 178         }
 179         return WERR_OK;
 180 }
 181
 182
 183 /*
 184   check security on a object identifier
 185  */
 186 WERROR drs_security_access_check(struct ldb_context *sam_ctx,
 187                                  TALLOC_CTX *mem_ctx,
 188                                  struct security_token *token,
 189                                  struct drsuapi_DsReplicaObjectIdentifier *nc,
 190                                  const char *ext_right)
 191 {
 192         struct ldb_dn *dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 193         WERROR werr;
 194         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, dn, ext_right);
 195         talloc_free(dn);
 196         return werr;
 197 }
 198
 199 /*
 200   check security on the NC root of a object identifier
 201  */
 202 WERROR drs_security_access_check_nc_root(struct ldb_context *sam_ctx,
 203                                          TALLOC_CTX *mem_ctx,
 204                                          struct security_token *token,
 205                                          struct drsuapi_DsReplicaObjectIdentifier *nc,
 206                                          const char *ext_right)
 207 {
 208         struct ldb_dn *dn, *nc_root;
 209         WERROR werr;
 210         int ret;
 211
 212         dn = drs_ObjectIdentifier_to_dn(mem_ctx, sam_ctx, nc);
 213         W_ERROR_HAVE_NO_MEMORY(dn);
 214         ret = dsdb_find_nc_root(sam_ctx, dn, dn, &nc_root);
 215         if (ret != LDB_SUCCESS) {
 216                 return WERR_DS_CANT_FIND_EXPECTED_NC;
 217         }
 218         werr = drs_security_access_check_log(sam_ctx, mem_ctx, token, nc_root, ext_right);
 219         talloc_free(dn);
 220         return werr;
 221 }