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         const char *domain_name;
  28         struct GUID domain_guid;
  29         struct netr_DsRGetDCNameInfo *dcinfo;
  30 };
  31
  32 static void wb_dsgetdcname_done(struct tevent_req *subreq);
  33
  34 struct tevent_req *wb_dsgetdcname_send(TALLOC_CTX *mem_ctx,
  35                                        struct tevent_context *ev,
  36                                        const char *domain_name,
  37                                        const struct GUID *domain_guid,
  38                                        const char *site_name,
  39                                        uint32_t flags)
  40 {
  41         struct tevent_req *req, *subreq;
  42         struct wb_dsgetdcname_state *state;
  43         struct dcerpc_binding_handle *child_binding_handle = NULL;
  44         struct GUID *guid_ptr = NULL;
  45
  46         req = tevent_req_create(mem_ctx, &state, struct wb_dsgetdcname_state);
  47         if (req == NULL) {
  48                 return NULL;
  49         }
  50
  51         D_INFO("WB command dsgetdcname start.\n"
  52                "Search domain name %s and site name %s.\n",
  53                domain_name,
  54                site_name);
  55         if (strequal(domain_name, "BUILTIN")) {
  56                 /*
  57                  * This makes no sense
  58                  */
  59                 tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  60                 return tevent_req_post(req, ev);
  61         }
  62
  63         if (strequal(domain_name, get_global_sam_name())) {
  64                 int role = lp_server_role();
  65                 if ( role != ROLE_ACTIVE_DIRECTORY_DC ) {
  66                         /*
  67                          * Two options here: Give back our own address, or say there's
  68                          * nobody around. Right now opting for the latter, one measure
  69                          * to prevent the loopback connects. This might change if
  70                          * needed.
  71                          */
  72                         tevent_req_nterror(req, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND);
  73                         return tevent_req_post(req, ev);
  74                 }
  75         }
  76
  77         if (IS_DC) {
  78                 /*
  79                  * We have to figure out the DC ourselves
  80                  */
  81                 child_binding_handle = locator_child_handle();
  82
  83                 if (IS_AD_DC) {
  84                         struct winbindd_domain *domain = NULL;
  85
  86                         /*
  87                          * If we know about the domain
  88                          * we replace a possible netbios domain name to
  89                          * a dns domain name, which means we'll always use
  90                          * dns+cldap because we have a fixed known number
  91                          * of trusted domains on a DC.
  92                          */
  93                         domain = find_domain_from_name_noinit(domain_name);
  94                         if (domain != NULL && domain->active_directory) {
  95                                 domain_name = domain->alt_name;
  96                         }
  97                 }
  98         } else {
  99                 struct winbindd_domain *domain = find_our_domain();
 100                 child_binding_handle = dom_child_handle(domain);
 101         }
 102
 103         if (domain_guid != NULL) {
 104                 /* work around a const issue in rpccli_ autogenerated code */
 105                 state->domain_guid = *domain_guid;
 106                 guid_ptr = &state->domain_guid;
 107         }
 108
 109         state->domain_name = talloc_strdup(state, domain_name);
 110         if (tevent_req_nomem(state->domain_name, req)) {
 111                 return tevent_req_post(req, ev);
 112         }
 113
 114         subreq = dcerpc_wbint_DsGetDcName_send(
 115                 state, ev, child_binding_handle, domain_name, guid_ptr, site_name,
 116                 flags, &state->dcinfo);
 117         if (tevent_req_nomem(subreq, req)) {
 118                 return tevent_req_post(req, ev);
 119         }
 120         tevent_req_set_callback(subreq, wb_dsgetdcname_done, req);
 121         return req;
 122 }
 123
 124 static void wb_dsgetdcname_done(struct tevent_req *subreq)
 125 {
 126         struct tevent_req *req = tevent_req_callback_data(
 127                 subreq, struct tevent_req);
 128         struct wb_dsgetdcname_state *state = tevent_req_data(
 129                 req, struct wb_dsgetdcname_state);
 130         NTSTATUS status, result;
 131
 132         status = dcerpc_wbint_DsGetDcName_recv(subreq, state, &result);
 133         TALLOC_FREE(subreq);
 134         if (any_nt_status_not_ok(status, result, &status)) {
 135                 tevent_req_nterror(req, status);
 136                 return;
 137         }
 138         tevent_req_done(req);
 139 }
 140
 141 NTSTATUS wb_dsgetdcname_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 142                              struct netr_DsRGetDCNameInfo **pdcinfo)
 143 {
 144         struct wb_dsgetdcname_state *state = tevent_req_data(
 145                 req, struct wb_dsgetdcname_state);
 146         NTSTATUS status;
 147
 148         D_INFO("WB command dsgetdcname for %s end.\n",
 149                state->domain_name);
 150         if (tevent_req_is_nterror(req, &status)) {
 151                 D_NOTICE("Failed for %s with %s.\n",
 152                          state->domain_name,
 153                          nt_errstr(status));
 154                 return status;
 155         }
 156         *pdcinfo = talloc_move(mem_ctx, &state->dcinfo);
 157         return NT_STATUS_OK;
 158 }
 159
 160 NTSTATUS wb_dsgetdcname_gencache_set(const char *domname,
 161                                      struct netr_DsRGetDCNameInfo *dcinfo)
 162 {
 163         DATA_BLOB blob;
 164         enum ndr_err_code ndr_err;
 165         char *key;
 166         bool ok;
 167
 168         key = talloc_asprintf_strupper_m(talloc_tos(), "DCINFO/%s", domname);
 169         if (key == NULL) {
 170                 return NT_STATUS_NO_MEMORY;
 171         }
 172
 173         if (DEBUGLEVEL >= DBGLVL_DEBUG) {
 174                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, dcinfo);
 175         }
 176
 177         ndr_err = ndr_push_struct_blob(
 178                 &blob, key, dcinfo,
 179                 (ndr_push_flags_fn_t)ndr_push_netr_DsRGetDCNameInfo);
 180         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 181                 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
 182                 DBG_WARNING("ndr_push_struct_blob failed: %s\n",
 183                             ndr_errstr(ndr_err));
 184                 TALLOC_FREE(key);
 185                 return status;
 186         }
 187
 188         ok = gencache_set_data_blob(key, blob, time(NULL)+3600);
 189
 190         if (!ok) {
 191                 DBG_WARNING("gencache_set_data_blob for key %s failed\n", key);
 192                 TALLOC_FREE(key);
 193                 return NT_STATUS_UNSUCCESSFUL;
 194         }
 195
 196         TALLOC_FREE(key);
 197         return NT_STATUS_OK;
 198 }
 199
 200 struct dcinfo_parser_state {
 201         NTSTATUS status;
 202         TALLOC_CTX *mem_ctx;
 203         struct netr_DsRGetDCNameInfo *dcinfo;
 204 };
 205
 206 static void dcinfo_parser(const struct gencache_timeout *timeout,
 207                           DATA_BLOB blob,
 208                           void *private_data)
 209 {
 210         struct dcinfo_parser_state *state = private_data;
 211         enum ndr_err_code ndr_err;
 212
 213         if (gencache_timeout_expired(timeout)) {
 214                 return;
 215         }
 216
 217         state->dcinfo = talloc(state->mem_ctx, struct netr_DsRGetDCNameInfo);
 218         if (state->dcinfo == NULL) {
 219                 state->status = NT_STATUS_NO_MEMORY;
 220                 return;
 221         }
 222
 223         ndr_err = ndr_pull_struct_blob_all(
 224                 &blob, state->dcinfo, state->dcinfo,
 225                 (ndr_pull_flags_fn_t)ndr_pull_netr_DsRGetDCNameInfo);
 226
 227         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 228                 DBG_ERR("ndr_pull_struct_blob failed\n");
 229                 state->status = ndr_map_error2ntstatus(ndr_err);
 230                 TALLOC_FREE(state->dcinfo);
 231                 return;
 232         }
 233
 234         state->status = NT_STATUS_OK;
 235 }
 236
 237 NTSTATUS wb_dsgetdcname_gencache_get(TALLOC_CTX *mem_ctx,
 238                                      const char *domname,
 239                                      struct netr_DsRGetDCNameInfo **dcinfo)
 240 {
 241         struct dcinfo_parser_state state;
 242         char *key;
 243         bool ok;
 244
 245         key = talloc_asprintf_strupper_m(mem_ctx, "DCINFO/%s", domname);
 246         if (key == NULL) {
 247                 return NT_STATUS_NO_MEMORY;
 248         }
 249
 250         state = (struct dcinfo_parser_state) {
 251                 .status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND,
 252                 .mem_ctx = mem_ctx,
 253         };
 254
 255         ok = gencache_parse(key, dcinfo_parser, &state);
 256         TALLOC_FREE(key);
 257         if (!ok) {
 258                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 259         }
 260
 261         if (!NT_STATUS_IS_OK(state.status)) {
 262                 return state.status;
 263         }
 264
 265         if (DEBUGLEVEL >= DBGLVL_DEBUG) {
 266                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, state.dcinfo);
 267         }
 268
 269         *dcinfo = state.dcinfo;
 270         return NT_STATUS_OK;
 271 }