source4/rpc_server/drsuapi/addentry.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    implement the DsAddEntry call
   5
   6    Copyright (C) Stefan Metzmacher 2009
   7    Copyright (C) Andrew Tridgell   2009
   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 "librpc/gen_ndr/ndr_drsuapi.h"
  25 #include "rpc_server/dcerpc_server.h"
  26 #include "rpc_server/common/common.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "lib/ldb/include/ldb_errors.h"
  29 #include "param/param.h"
  30 #include "librpc/gen_ndr/ndr_drsblobs.h"
  31 #include "auth/auth.h"
  32 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
  33 #include "libcli/security/security.h"
  34
  35
  36 /*
  37   add special SPNs needed for DRS replication to machine accounts when
  38   an AddEntry is done to create a nTDSDSA object
  39  */
  40 static WERROR drsuapi_add_SPNs(struct drsuapi_bind_state *b_state,
  41                                struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
  42                                const struct drsuapi_DsReplicaObjectListItem *first_object)
  43 {
  44         int ret;
  45         const struct drsuapi_DsReplicaObjectListItem *obj;
  46         const char *attrs[] = { "serverReference", "objectGUID", NULL };
  47
  48         for (obj = first_object; obj; obj=obj->next_object) {
  49                 const char *dn_string = obj->object.identifier->dn;
  50                 struct ldb_dn *dn = ldb_dn_new(mem_ctx, b_state->sam_ctx, dn_string);
  51                 struct ldb_result *res;
  52                 struct ldb_dn *ref_dn;
  53                 struct GUID ntds_guid;
  54                 struct ldb_message *msg;
  55                 struct ldb_message_element *el;
  56                 const char *ntds_guid_str;
  57                 const char *dom_string;
  58
  59                 ret = ldb_search(b_state->sam_ctx, mem_ctx, &res,
  60                                  dn, LDB_SCOPE_BASE, attrs,
  61                                  "(objectClass=ntDSDSA)");
  62                 if (ret != LDB_SUCCESS || res->count < 1) {
  63                         DEBUG(0,(__location__ ": Failed to find dn '%s'\n", dn_string));
  64                         return WERR_DS_DRA_INTERNAL_ERROR;
  65                 }
  66
  67                 ref_dn = samdb_result_dn(b_state->sam_ctx, mem_ctx, res->msgs[0], "serverReference", NULL);
  68                 if (ref_dn == NULL) {
  69                         /* we only add SPNs for objects with a
  70                            serverReference */
  71                         continue;
  72                 }
  73
  74                 ntds_guid = samdb_result_guid(res->msgs[0], "objectGUID");
  75
  76                 ntds_guid_str = GUID_string(res, &ntds_guid);
  77
  78                 dom_string = lp_realm(dce_call->conn->dce_ctx->lp_ctx);
  79
  80                 /*
  81                  * construct a modify request to add the new SPNs to
  82                  * the machine account
  83                  */
  84                 msg = ldb_msg_new(mem_ctx);
  85                 if (msg == NULL) {
  86                         return WERR_NOMEM;
  87                 }
  88
  89                 msg->dn = ref_dn;
  90                 ret = ldb_msg_add_empty(msg, "servicePrincipalName",
  91                                         LDB_FLAG_MOD_ADD, &el);
  92                 if (ret != LDB_SUCCESS) {
  93                         return WERR_NOMEM;
  94                 }
  95
  96                 el->num_values = 2;
  97                 el->values = talloc_array(el, struct ldb_val, 2);
  98                 if (el->values == NULL) {
  99                         return WERR_NOMEM;
 100                 }
 101                 /* the magic constant is the GUID of the DRSUAPI RPC
 102                    interface */
 103                 el->values[0].data = (uint8_t *)talloc_asprintf(el->values,
 104                                                                 "E3514235-4B06-11D1-AB04-00C04FC2DCD2/%s/%s",
 105                                                                 ntds_guid_str, dom_string);
 106                 el->values[0].length = strlen((char *)el->values[0].data);
 107                 el->values[1].data = (uint8_t *)talloc_asprintf(el->values, "ldap/%s._msdcs.%s",
 108                                                                 ntds_guid_str, dom_string);
 109                 el->values[1].length = strlen((char *)el->values[1].data);
 110
 111                 ret = ldb_modify(b_state->sam_ctx, msg);
 112                 if (ret != LDB_SUCCESS) {
 113                         DEBUG(0,(__location__ ": Failed to add SPNs - %s\n",
 114                                  ldb_errstring(b_state->sam_ctx)));
 115                         return WERR_DS_DRA_INTERNAL_ERROR;
 116                 }
 117         }
 118
 119         return WERR_OK;
 120 }
 121
 122
 123
 124
 125 /*
 126   drsuapi_DsAddEntry
 127 */
 128 WERROR dcesrv_drsuapi_DsAddEntry(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
 129                                  struct drsuapi_DsAddEntry *r)
 130 {
 131         WERROR status;
 132         struct drsuapi_bind_state *b_state;
 133         struct dcesrv_handle *h;
 134         uint32_t num = 0;
 135         struct drsuapi_DsReplicaObjectIdentifier2 *ids = NULL;
 136         int ret;
 137         const struct drsuapi_DsReplicaObjectListItem *first_object;
 138
 139         if (DEBUGLVL(4)) {
 140                 NDR_PRINT_FUNCTION_DEBUG(drsuapi_DsAddEntry, NDR_IN, r);
 141         }
 142
 143         /* TODO: check which out level the client supports */
 144
 145         ZERO_STRUCTP(r->out.ctr);
 146         *r->out.level_out = 3;
 147         r->out.ctr->ctr3.level = 1;
 148         r->out.ctr->ctr3.error = talloc_zero(mem_ctx, union drsuapi_DsAddEntryError);
 149
 150         DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
 151         b_state = h->data;
 152
 153         if (security_session_user_level(dce_call->conn->auth_state.session_info) <
 154             SECURITY_DOMAIN_CONTROLLER) {
 155                 DEBUG(0,("DsAddEntry refused for security token\n"));
 156                 return WERR_DS_DRA_ACCESS_DENIED;
 157         }
 158
 159         switch (r->in.level) {
 160         case 2:
 161                 ret = ldb_transaction_start(b_state->sam_ctx);
 162                 if (ret != LDB_SUCCESS) {
 163                         return WERR_DS_DRA_INTERNAL_ERROR;
 164                 }
 165
 166
 167                 first_object = &r->in.req->req2.first_object;
 168
 169                 status = dsdb_origin_objects_commit(b_state->sam_ctx,
 170                                                     mem_ctx,
 171                                                     first_object,
 172                                                     &num,
 173                                                     &ids);
 174                 if (!W_ERROR_IS_OK(status)) {
 175                         r->out.ctr->ctr3.error->info1.status = status;
 176                         ldb_transaction_cancel(b_state->sam_ctx);
 177                         return status;
 178                 }
 179
 180                 r->out.ctr->ctr3.count = num;
 181                 r->out.ctr->ctr3.objects = ids;
 182
 183                 break;
 184         default:
 185                 return WERR_FOOBAR;
 186         }
 187
 188         /* if any of the added entries are nTDSDSA objects then we
 189          * need to add the SPNs to the machine account
 190          */
 191         status = drsuapi_add_SPNs(b_state, dce_call, mem_ctx, first_object);
 192         if (!W_ERROR_IS_OK(status)) {
 193                 r->out.ctr->ctr3.error->info1.status = status;
 194                 ldb_transaction_cancel(b_state->sam_ctx);
 195                 return status;
 196         }
 197
 198         ret = ldb_transaction_commit(b_state->sam_ctx);
 199         if (ret != LDB_SUCCESS) {
 200                 return WERR_DS_DRA_INTERNAL_ERROR;
 201         }
 202
 203         return WERR_OK;
 204 }