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
  25 struct wb_dsgetdcname_state {
  26         struct netr_DsRGetDCNameInfo *dcinfo;
  27 };
  28
  29 static void wb_dsgetdcname_done(struct tevent_req *subreq);
  30
  31 struct tevent_req *wb_dsgetdcname_send(TALLOC_CTX *mem_ctx,
  32                                        struct tevent_context *ev,
  33                                        const char *domain_name,
  34                                        const struct GUID *domain_guid,
  35                                        const char *site_name,
  36                                        uint32_t flags)
  37 {
  38         struct tevent_req *req, *subreq;
  39         struct wb_dsgetdcname_state *state;
  40         struct winbindd_child *child;
  41         struct GUID guid;
  42         struct GUID *guid_ptr = NULL;
  43
  44         req = tevent_req_create(mem_ctx, &state, struct wb_dsgetdcname_state);
  45         if (req == NULL) {
  46                 return NULL;
  47         }
  48
  49         if (strequal(domain_name, "BUILTIN")) {
  50                 /*
  51                  * This makes no sense
  52                  */
  53                 tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  54                 return tevent_req_post(req, ev);
  55         }
  56
  57         if (strequal(domain_name, get_global_sam_name())) {
  58                 int role = lp_server_role();
  59                 if ( role != ROLE_ACTIVE_DIRECTORY_DC ) {
  60                         /*
  61                          * Two options here: Give back our own address, or say there's
  62                          * nobody around. Right now opting for the latter, one measure
  63                          * to prevent the loopback connects. This might change if
  64                          * needed.
  65                          */
  66                         tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  67                         return tevent_req_post(req, ev);
  68                 }
  69         }
  70
  71         if (IS_DC) {
  72                 /*
  73                  * We have to figure out the DC ourselves
  74                  */
  75                 child = locator_child();
  76         } else {
  77                 struct winbindd_domain *domain = find_our_domain();
  78                 child = choose_domain_child(domain);
  79         }
  80
  81         if (domain_guid != NULL) {
  82                 /* work around a const issue in rpccli_ autogenerated code */
  83                 guid = *domain_guid;
  84                 guid_ptr = &guid;
  85         }
  86
  87         subreq = dcerpc_wbint_DsGetDcName_send(
  88                 state, ev, child->binding_handle, domain_name, guid_ptr, site_name,
  89                 flags, &state->dcinfo);
  90         if (tevent_req_nomem(subreq, req)) {
  91                 return tevent_req_post(req, ev);
  92         }
  93         tevent_req_set_callback(subreq, wb_dsgetdcname_done, req);
  94         return req;
  95 }
  96
  97 static void wb_dsgetdcname_done(struct tevent_req *subreq)
  98 {
  99         struct tevent_req *req = tevent_req_callback_data(
 100                 subreq, struct tevent_req);
 101         struct wb_dsgetdcname_state *state = tevent_req_data(
 102                 req, struct wb_dsgetdcname_state);
 103         NTSTATUS status, result;
 104
 105         status = dcerpc_wbint_DsGetDcName_recv(subreq, state, &result);
 106         TALLOC_FREE(subreq);
 107         if (any_nt_status_not_ok(status, result, &status)) {
 108                 tevent_req_nterror(req, status);
 109                 return;
 110         }
 111         tevent_req_done(req);
 112 }
 113
 114 NTSTATUS wb_dsgetdcname_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 115                              struct netr_DsRGetDCNameInfo **pdcinfo)
 116 {
 117         struct wb_dsgetdcname_state *state = tevent_req_data(
 118                 req, struct wb_dsgetdcname_state);
 119         NTSTATUS status;
 120
 121         if (tevent_req_is_nterror(req, &status)) {
 122                 return status;
 123         }
 124         *pdcinfo = talloc_move(mem_ctx, &state->dcinfo);
 125         return NT_STATUS_OK;
 126 }
 127
 128 NTSTATUS wb_dsgetdcname_gencache_set(const char *domname,
 129                                      struct netr_DsRGetDCNameInfo *dcinfo)
 130 {
 131         DATA_BLOB blob;
 132         enum ndr_err_code ndr_err;
 133         char *key;
 134         bool ok;
 135
 136         key = talloc_asprintf_strupper_m(talloc_tos(), "DCINFO/%s", domname);
 137         if (key == NULL) {
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         if (DEBUGLEVEL >= 10) {
 142                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, dcinfo);
 143         }
 144
 145         ndr_err = ndr_push_struct_blob(
 146                 &blob, key, dcinfo,
 147                 (ndr_push_flags_fn_t)ndr_push_netr_DsRGetDCNameInfo);
 148         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 149                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 150                 DBG_WARNING("ndr_push_struct_blob failed: %s\n",
 151                             ndr_errstr(ndr_err));
 152                 TALLOC_FREE(key);
 153                 return status;
 154         }
 155
 156         ok = gencache_set_data_blob(key, &blob, time(NULL)+3600);
 157
 158         if (!ok) {
 159                 DBG_WARNING("gencache_set_data_blob for key %s failed\n", key);
 160                 TALLOC_FREE(key);
 161                 return NT_STATUS_UNSUCCESSFUL;
 162         }
 163
 164         TALLOC_FREE(key);
 165         return NT_STATUS_OK;
 166 }
 167
 168 struct dcinfo_parser_state {
 169         NTSTATUS status;
 170         TALLOC_CTX *mem_ctx;
 171         struct netr_DsRGetDCNameInfo *dcinfo;
 172 };
 173
 174 static void dcinfo_parser(time_t timeout, DATA_BLOB blob, void *private_data)
 175 {
 176         struct dcinfo_parser_state *state = private_data;
 177         enum ndr_err_code ndr_err;
 178
 179         if (timeout <= time(NULL)) {
 180                 return;
 181         }
 182
 183         state->dcinfo = talloc(state->mem_ctx, struct netr_DsRGetDCNameInfo);
 184         if (state->dcinfo == NULL) {
 185                 state->status = NT_STATUS_NO_MEMORY;
 186                 return;
 187         }
 188
 189         ndr_err = ndr_pull_struct_blob_all(
 190                 &blob, state->dcinfo, state->dcinfo,
 191                 (ndr_pull_flags_fn_t)ndr_pull_netr_DsRGetDCNameInfo);
 192
 193         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 194                 DBG_ERR("ndr_pull_struct_blob failed\n");
 195                 state->status = ndr_map_error2ntstatus(ndr_err);
 196                 return;
 197         }
 198
 199         state->status = NT_STATUS_OK;
 200 }
 201
 202 NTSTATUS wb_dsgetdcname_gencache_get(TALLOC_CTX *mem_ctx,
 203                                      const char *domname,
 204                                      struct netr_DsRGetDCNameInfo **dcinfo)
 205 {
 206         struct dcinfo_parser_state state;
 207         char *key;
 208         bool ok;
 209
 210         key = talloc_asprintf_strupper_m(mem_ctx, "DCINFO/%s", domname);
 211         if (key == NULL) {
 212                 return NT_STATUS_NO_MEMORY;
 213         }
 214
 215         state = (struct dcinfo_parser_state) {
 216                 .status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND,
 217                 .mem_ctx = mem_ctx,
 218         };
 219
 220         ok = gencache_parse(key, dcinfo_parser, &state);
 221         TALLOC_FREE(key);
 222         if (!ok) {
 223                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 224         }
 225
 226         if (!NT_STATUS_IS_OK(state.status)) {
 227                 return state.status;
 228         }
 229
 230         if (DEBUGLEVEL >= 10) {
 231                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, state.dcinfo);
 232         }
 233
 234         *dcinfo = state.dcinfo;
 235         return NT_STATUS_OK;
 236 }