source3/winbindd/wb_dsgetdcname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    async dsgetdcname
   4    Copyright (C) Volker Lendecke 2009
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "winbindd.h"
  22 #include "librpc/gen_ndr/ndr_winbind_c.h"
  23 #include "librpc/gen_ndr/ndr_netlogon.h"
  24 #include "lib/gencache.h"
  25
  26 struct wb_dsgetdcname_state {
  27         struct netr_DsRGetDCNameInfo *dcinfo;
  28 };
  29
  30 static void wb_dsgetdcname_done(struct tevent_req *subreq);
  31
  32 struct tevent_req *wb_dsgetdcname_send(TALLOC_CTX *mem_ctx,
  33                                        struct tevent_context *ev,
  34                                        const char *domain_name,
  35                                        const struct GUID *domain_guid,
  36                                        const char *site_name,
  37                                        uint32_t flags)
  38 {
  39         struct tevent_req *req, *subreq;
  40         struct wb_dsgetdcname_state *state;
  41         struct dcerpc_binding_handle *child_binding_handle = NULL;
  42         struct GUID guid;
  43         struct GUID *guid_ptr = NULL;
  44
  45         req = tevent_req_create(mem_ctx, &state, struct wb_dsgetdcname_state);
  46         if (req == NULL) {
  47                 return NULL;
  48         }
  49
  50         if (strequal(domain_name, "BUILTIN")) {
  51                 /*
  52                  * This makes no sense
  53                  */
  54                 tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  55                 return tevent_req_post(req, ev);
  56         }
  57
  58         if (strequal(domain_name, get_global_sam_name())) {
  59                 int role = lp_server_role();
  60                 if ( role != ROLE_ACTIVE_DIRECTORY_DC ) {
  61                         /*
  62                          * Two options here: Give back our own address, or say there's
  63                          * nobody around. Right now opting for the latter, one measure
  64                          * to prevent the loopback connects. This might change if
  65                          * needed.
  66                          */
  67                         tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  68                         return tevent_req_post(req, ev);
  69                 }
  70         }
  71
  72         if (IS_DC) {
  73                 /*
  74                  * We have to figure out the DC ourselves
  75                  */
  76                 child_binding_handle = locator_child_handle();
  77         } else {
  78                 struct winbindd_domain *domain = find_our_domain();
  79                 child_binding_handle = dom_child_handle(domain);
  80         }
  81
  82         if (domain_guid != NULL) {
  83                 /* work around a const issue in rpccli_ autogenerated code */
  84                 guid = *domain_guid;
  85                 guid_ptr = &guid;
  86         }
  87
  88         subreq = dcerpc_wbint_DsGetDcName_send(
  89                 state, ev, child_binding_handle, domain_name, guid_ptr, site_name,
  90                 flags, &state->dcinfo);
  91         if (tevent_req_nomem(subreq, req)) {
  92                 return tevent_req_post(req, ev);
  93         }
  94         tevent_req_set_callback(subreq, wb_dsgetdcname_done, req);
  95         return req;
  96 }
  97
  98 static void wb_dsgetdcname_done(struct tevent_req *subreq)
  99 {
 100         struct tevent_req *req = tevent_req_callback_data(
 101                 subreq, struct tevent_req);
 102         struct wb_dsgetdcname_state *state = tevent_req_data(
 103                 req, struct wb_dsgetdcname_state);
 104         NTSTATUS status, result;
 105
 106         status = dcerpc_wbint_DsGetDcName_recv(subreq, state, &result);
 107         TALLOC_FREE(subreq);
 108         if (any_nt_status_not_ok(status, result, &status)) {
 109                 tevent_req_nterror(req, status);
 110                 return;
 111         }
 112         tevent_req_done(req);
 113 }
 114
 115 NTSTATUS wb_dsgetdcname_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 116                              struct netr_DsRGetDCNameInfo **pdcinfo)
 117 {
 118         struct wb_dsgetdcname_state *state = tevent_req_data(
 119                 req, struct wb_dsgetdcname_state);
 120         NTSTATUS status;
 121
 122         if (tevent_req_is_nterror(req, &status)) {
 123                 return status;
 124         }
 125         *pdcinfo = talloc_move(mem_ctx, &state->dcinfo);
 126         return NT_STATUS_OK;
 127 }
 128
 129 NTSTATUS wb_dsgetdcname_gencache_set(const char *domname,
 130                                      struct netr_DsRGetDCNameInfo *dcinfo)
 131 {
 132         DATA_BLOB blob;
 133         enum ndr_err_code ndr_err;
 134         char *key;
 135         bool ok;
 136
 137         key = talloc_asprintf_strupper_m(talloc_tos(), "DCINFO/%s", domname);
 138         if (key == NULL) {
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141
 142         if (DEBUGLEVEL >= 10) {
 143                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, dcinfo);
 144         }
 145
 146         ndr_err = ndr_push_struct_blob(
 147                 &blob, key, dcinfo,
 148                 (ndr_push_flags_fn_t)ndr_push_netr_DsRGetDCNameInfo);
 149         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 150                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 151                 DBG_WARNING("ndr_push_struct_blob failed: %s\n",
 152                             ndr_errstr(ndr_err));
 153                 TALLOC_FREE(key);
 154                 return status;
 155         }
 156
 157         ok = gencache_set_data_blob(key, blob, time(NULL)+3600);
 158
 159         if (!ok) {
 160                 DBG_WARNING("gencache_set_data_blob for key %s failed\n", key);
 161                 TALLOC_FREE(key);
 162                 return NT_STATUS_UNSUCCESSFUL;
 163         }
 164
 165         TALLOC_FREE(key);
 166         return NT_STATUS_OK;
 167 }
 168
 169 struct dcinfo_parser_state {
 170         NTSTATUS status;
 171         TALLOC_CTX *mem_ctx;
 172         struct netr_DsRGetDCNameInfo *dcinfo;
 173 };
 174
 175 static void dcinfo_parser(const struct gencache_timeout *timeout,
 176                           DATA_BLOB blob,
 177                           void *private_data)
 178 {
 179         struct dcinfo_parser_state *state = private_data;
 180         enum ndr_err_code ndr_err;
 181
 182         if (gencache_timeout_expired(timeout)) {
 183                 return;
 184         }
 185
 186         state->dcinfo = talloc(state->mem_ctx, struct netr_DsRGetDCNameInfo);
 187         if (state->dcinfo == NULL) {
 188                 state->status = NT_STATUS_NO_MEMORY;
 189                 return;
 190         }
 191
 192         ndr_err = ndr_pull_struct_blob_all(
 193                 &blob, state->dcinfo, state->dcinfo,
 194                 (ndr_pull_flags_fn_t)ndr_pull_netr_DsRGetDCNameInfo);
 195
 196         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 197                 DBG_ERR("ndr_pull_struct_blob failed\n");
 198                 state->status = ndr_map_error2ntstatus(ndr_err);
 199                 TALLOC_FREE(state->dcinfo);
 200                 return;
 201         }
 202
 203         state->status = NT_STATUS_OK;
 204 }
 205
 206 NTSTATUS wb_dsgetdcname_gencache_get(TALLOC_CTX *mem_ctx,
 207                                      const char *domname,
 208                                      struct netr_DsRGetDCNameInfo **dcinfo)
 209 {
 210         struct dcinfo_parser_state state;
 211         char *key;
 212         bool ok;
 213
 214         key = talloc_asprintf_strupper_m(mem_ctx, "DCINFO/%s", domname);
 215         if (key == NULL) {
 216                 return NT_STATUS_NO_MEMORY;
 217         }
 218
 219         state = (struct dcinfo_parser_state) {
 220                 .status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND,
 221                 .mem_ctx = mem_ctx,
 222         };
 223
 224         ok = gencache_parse(key, dcinfo_parser, &state);
 225         TALLOC_FREE(key);
 226         if (!ok) {
 227                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 228         }
 229
 230         if (!NT_STATUS_IS_OK(state.status)) {
 231                 return state.status;
 232         }
 233
 234         if (DEBUGLEVEL >= 10) {
 235                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, state.dcinfo);
 236         }
 237
 238         *dcinfo = state.dcinfo;
 239         return NT_STATUS_OK;
 240 }