source4/libcli/finddcs_cldap.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    a composite API for finding a DC and its name via CLDAP
   5
   6    Copyright (C) Andrew Tridgell 2010
   7    Copyright (C) Andrew Bartlett 2010
   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 "include/includes.h"
  24 #include <tevent.h>
  25 #include "libcli/resolve/resolve.h"
  26 #include "libcli/cldap/cldap.h"
  27 #include "libcli/finddc.h"
  28 #include "libcli/security/security.h"
  29 #include "lib/util/tevent_ntstatus.h"
  30 #include "lib/tsocket/tsocket.h"
  31 #include "libcli/composite/composite.h"
  32 #include "lib/util/util_net.h"
  33
  34 struct finddcs_cldap_state {
  35         struct tevent_context *ev;
  36         struct tevent_req *req;
  37         const char *domain_name;
  38         struct dom_sid *domain_sid;
  39         const char *srv_name;
  40         const char **srv_addresses;
  41         uint32_t minimum_dc_flags;
  42         uint32_t srv_address_index;
  43         struct cldap_socket *cldap;
  44         struct cldap_netlogon *netlogon;
  45 };
  46
  47 static void finddcs_cldap_srv_resolved(struct composite_context *ctx);
  48 static void finddcs_cldap_netlogon_replied(struct tevent_req *req);
  49 static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
  50                                      struct finddcs *io,
  51                                      struct resolve_context *resolve_ctx,
  52                                      struct tevent_context *event_ctx);
  53 static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
  54                                      struct finddcs *io,
  55                                      struct resolve_context *resolve_ctx,
  56                                      struct tevent_context *event_ctx);
  57 static void finddcs_cldap_nbt_resolved(struct composite_context *ctx);
  58 static bool finddcs_cldap_name_lookup(struct finddcs_cldap_state *state,
  59                                       struct finddcs *io,
  60                                       struct resolve_context *resolve_ctx,
  61                                       struct tevent_context *event_ctx);
  62 static void finddcs_cldap_name_resolved(struct composite_context *ctx);
  63 static void finddcs_cldap_next_server(struct finddcs_cldap_state *state);
  64 static bool finddcs_cldap_ipaddress(struct finddcs_cldap_state *state, struct finddcs *io);
  65
  66
  67 /*
  68  * find a list of DCs via DNS/CLDAP
  69  */
  70 struct tevent_req *finddcs_cldap_send(TALLOC_CTX *mem_ctx,
  71                                       struct finddcs *io,
  72                                       struct resolve_context *resolve_ctx,
  73                                       struct tevent_context *event_ctx)
  74 {
  75         struct finddcs_cldap_state *state;
  76         struct tevent_req *req;
  77
  78         req = tevent_req_create(mem_ctx, &state, struct finddcs_cldap_state);
  79         if (req == NULL) {
  80                 return NULL;
  81         }
  82
  83         state->req = req;
  84         state->ev = event_ctx;
  85         state->minimum_dc_flags = io->in.minimum_dc_flags;
  86
  87         if (io->in.domain_name) {
  88                 state->domain_name = talloc_strdup(state, io->in.domain_name);
  89                 if (tevent_req_nomem(state->domain_name, req)) {
  90                         return tevent_req_post(req, event_ctx);
  91                 }
  92         } else {
  93                 state->domain_name = NULL;
  94         }
  95
  96         if (io->in.domain_sid) {
  97                 state->domain_sid = dom_sid_dup(state, io->in.domain_sid);
  98                 if (tevent_req_nomem(state->domain_sid, req)) {
  99                         return tevent_req_post(req, event_ctx);
 100                 }
 101         } else {
 102                 state->domain_sid = NULL;
 103         }
 104
 105         if (io->in.server_address) {
 106                 if (is_ipaddress(io->in.server_address)) {
 107                         DEBUG(4,("finddcs: searching for a DC by IP %s\n",
 108                                  io->in.server_address));
 109                         if (!finddcs_cldap_ipaddress(state, io)) {
 110                                 return tevent_req_post(req, event_ctx);
 111                         }
 112                 } else {
 113                         if (!finddcs_cldap_name_lookup(state, io, resolve_ctx,
 114                                                        event_ctx)) {
 115                                 return tevent_req_post(req, event_ctx);
 116                         }
 117                 }
 118         } else if (io->in.domain_name) {
 119                 if (strchr(state->domain_name, '.')) {
 120                         /* looks like a DNS name */
 121                         DEBUG(4,("finddcs: searching for a DC by DNS domain %s\n", state->domain_name));
 122                         if (!finddcs_cldap_srv_lookup(state, io, resolve_ctx,
 123                                                       event_ctx)) {
 124                                 return tevent_req_post(req, event_ctx);
 125                         }
 126                 } else {
 127                         DEBUG(4,("finddcs: searching for a DC by NBT lookup %s\n", state->domain_name));
 128                         if (!finddcs_cldap_nbt_lookup(state, io, resolve_ctx,
 129                                                       event_ctx)) {
 130                                 return tevent_req_post(req, event_ctx);
 131                         }
 132                 }
 133         } else {
 134                 /* either we have the domain name or the IP address */
 135                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
 136                 DEBUG(2,("finddcs: Please specify at least the domain name or the IP address! \n"));
 137                 return tevent_req_post(req, event_ctx);
 138         }
 139
 140         return req;
 141 }
 142
 143
 144 /*
 145   we've been told the IP of the server, bypass name
 146   resolution and go straight to CLDAP
 147 */
 148 static bool finddcs_cldap_ipaddress(struct finddcs_cldap_state *state, struct finddcs *io)
 149 {
 150         NTSTATUS status;
 151
 152         state->srv_addresses = talloc_array(state, const char *, 2);
 153         if (tevent_req_nomem(state->srv_addresses, state->req)) {
 154                 return false;
 155         }
 156         state->srv_addresses[0] = talloc_strdup(state->srv_addresses, io->in.server_address);
 157         if (tevent_req_nomem(state->srv_addresses[0], state->req)) {
 158                 return false;
 159         }
 160         state->srv_addresses[1] = NULL;
 161         state->srv_address_index = 0;
 162
 163         finddcs_cldap_next_server(state);
 164         return tevent_req_is_nterror(state->req, &status);
 165 }
 166
 167 /*
 168   start a SRV DNS lookup
 169  */
 170 static bool finddcs_cldap_srv_lookup(struct finddcs_cldap_state *state,
 171                                      struct finddcs *io,
 172                                      struct resolve_context *resolve_ctx,
 173                                      struct tevent_context *event_ctx)
 174 {
 175         struct composite_context *creq;
 176         struct nbt_name name;
 177
 178         if (io->in.site_name) {
 179                 state->srv_name = talloc_asprintf(state, "_ldap._tcp.%s._sites.%s",
 180                                            io->in.site_name, io->in.domain_name);
 181         } else {
 182                 state->srv_name = talloc_asprintf(state, "_ldap._tcp.%s", io->in.domain_name);
 183         }
 184
 185         DEBUG(4,("finddcs: looking for SRV records for %s\n", state->srv_name));
 186
 187         make_nbt_name(&name, state->srv_name, 0);
 188
 189         creq = resolve_name_ex_send(resolve_ctx, state,
 190                                     RESOLVE_NAME_FLAG_FORCE_DNS | RESOLVE_NAME_FLAG_DNS_SRV,
 191                                     0, &name, event_ctx);
 192         if (tevent_req_nomem(creq, state->req)) {
 193                 return false;
 194         }
 195         creq->async.fn = finddcs_cldap_srv_resolved;
 196         creq->async.private_data = state;
 197
 198         return true;
 199 }
 200
 201 /*
 202   start a NBT name lookup for domain<1C>
 203  */
 204 static bool finddcs_cldap_nbt_lookup(struct finddcs_cldap_state *state,
 205                                      struct finddcs *io,
 206                                      struct resolve_context *resolve_ctx,
 207                                      struct tevent_context *event_ctx)
 208 {
 209         struct composite_context *creq;
 210         struct nbt_name name;
 211
 212         make_nbt_name(&name, state->domain_name, NBT_NAME_LOGON);
 213         creq = resolve_name_send(resolve_ctx, state, &name, event_ctx);
 214         if (tevent_req_nomem(creq, state->req)) {
 215                 return false;
 216         }
 217         creq->async.fn = finddcs_cldap_nbt_resolved;
 218         creq->async.private_data = state;
 219         return true;
 220 }
 221
 222 static bool finddcs_cldap_name_lookup(struct finddcs_cldap_state *state,
 223                                       struct finddcs *io,
 224                                       struct resolve_context *resolve_ctx,
 225                                       struct tevent_context *event_ctx)
 226 {
 227         struct composite_context *creq;
 228         struct nbt_name name;
 229
 230         make_nbt_name(&name, io->in.server_address, NBT_NAME_SERVER);
 231         creq = resolve_name_send(resolve_ctx, state, &name, event_ctx);
 232         if (tevent_req_nomem(creq, state->req)) {
 233                 return false;
 234         }
 235         creq->async.fn = finddcs_cldap_name_resolved;
 236         creq->async.private_data = state;
 237         return true;
 238 }
 239
 240 /*
 241   fire off a CLDAP query to the next server
 242  */
 243 static void finddcs_cldap_next_server(struct finddcs_cldap_state *state)
 244 {
 245         struct tevent_req *subreq;
 246         struct tsocket_address *dest;
 247         int ret;
 248         NTSTATUS status;
 249
 250         if (state->srv_addresses[state->srv_address_index] == NULL) {
 251                 tevent_req_nterror(state->req, NT_STATUS_OBJECT_NAME_NOT_FOUND);
 252                 DEBUG(2,("finddcs: No matching CLDAP server found\n"));
 253                 return;
 254         }
 255
 256         /* we should get the port from the SRV response */
 257         ret = tsocket_address_inet_from_strings(state, "ip",
 258                                                 state->srv_addresses[state->srv_address_index],
 259                                                 389,
 260                                                 &dest);
 261         if (ret == 0) {
 262                 status = NT_STATUS_OK;
 263         } else {
 264                 status = map_nt_error_from_unix_common(errno);
 265         }
 266         if (tevent_req_nterror(state->req, status)) {
 267                 return;
 268         }
 269
 270         status = cldap_socket_init(state, NULL, dest, &state->cldap);
 271         if (tevent_req_nterror(state->req, status)) {
 272                 return;
 273         }
 274
 275         TALLOC_FREE(state->netlogon);
 276         state->netlogon = talloc_zero(state, struct cldap_netlogon);
 277         if (tevent_req_nomem(state->netlogon, state->req)) {
 278                 return;
 279         }
 280
 281         if ((state->domain_name != NULL) && (strchr(state->domain_name, '.'))) {
 282                 state->netlogon->in.realm = state->domain_name;
 283         }
 284         if (state->domain_sid) {
 285                 state->netlogon->in.domain_sid = dom_sid_string(state, state->domain_sid);
 286                 if (tevent_req_nomem(state->netlogon->in.domain_sid, state->req)) {
 287                         return;
 288                 }
 289         }
 290         state->netlogon->in.acct_control = -1;
 291         state->netlogon->in.version =
 292                 NETLOGON_NT_VERSION_5 |
 293                 NETLOGON_NT_VERSION_5EX |
 294                 NETLOGON_NT_VERSION_IP;
 295         state->netlogon->in.map_response = true;
 296
 297         DEBUG(4,("finddcs: performing CLDAP query on %s\n",
 298                  state->srv_addresses[state->srv_address_index]));
 299
 300         subreq = cldap_netlogon_send(state, state->ev,
 301                                      state->cldap, state->netlogon);
 302         if (tevent_req_nomem(subreq, state->req)) {
 303                 return;
 304         }
 305
 306         tevent_req_set_callback(subreq, finddcs_cldap_netlogon_replied, state);
 307 }
 308
 309
 310 /*
 311   we have a response from a CLDAP server for a netlogon request
 312  */
 313 static void finddcs_cldap_netlogon_replied(struct tevent_req *subreq)
 314 {
 315         struct finddcs_cldap_state *state;
 316         NTSTATUS status;
 317
 318         state = tevent_req_callback_data(subreq, struct finddcs_cldap_state);
 319
 320         status = cldap_netlogon_recv(subreq, state->netlogon, state->netlogon);
 321         TALLOC_FREE(subreq);
 322         TALLOC_FREE(state->cldap);
 323         if (!NT_STATUS_IS_OK(status)) {
 324                 state->srv_address_index++;
 325                 finddcs_cldap_next_server(state);
 326                 return;
 327         }
 328         if (state->minimum_dc_flags !=
 329             (state->minimum_dc_flags & state->netlogon->out.netlogon.data.nt5_ex.server_type)) {
 330                 /* the server didn't match the minimum requirements */
 331                 DEBUG(4,("finddcs: Skipping DC %s with server_type=0x%08x - required 0x%08x\n",
 332                          state->srv_addresses[state->srv_address_index],
 333                          state->netlogon->out.netlogon.data.nt5_ex.server_type,
 334                          state->minimum_dc_flags));
 335                 state->srv_address_index++;
 336                 finddcs_cldap_next_server(state);
 337                 return;
 338         }
 339
 340         DEBUG(4,("finddcs: Found matching DC %s with server_type=0x%08x\n",
 341                  state->srv_addresses[state->srv_address_index],
 342                  state->netlogon->out.netlogon.data.nt5_ex.server_type));
 343
 344         tevent_req_done(state->req);
 345 }
 346
 347 static void finddcs_cldap_name_resolved(struct composite_context *ctx)
 348 {
 349         struct finddcs_cldap_state *state =
 350                 talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
 351         NTSTATUS status;
 352         unsigned i;
 353
 354         status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
 355         if (tevent_req_nterror(state->req, status)) {
 356                 DEBUG(2,("finddcs: No matching server found\n"));
 357                 return;
 358         }
 359
 360         for (i=0; state->srv_addresses[i]; i++) {
 361                 DEBUG(4,("finddcs: response %u at '%s'\n",
 362                          i, state->srv_addresses[i]));
 363         }
 364
 365         state->srv_address_index = 0;
 366
 367         finddcs_cldap_next_server(state);
 368 }
 369
 370 /*
 371    handle NBT name lookup reply
 372  */
 373 static void finddcs_cldap_nbt_resolved(struct composite_context *ctx)
 374 {
 375         struct finddcs_cldap_state *state =
 376                 talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
 377         NTSTATUS status;
 378         unsigned i;
 379
 380         status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
 381         if (tevent_req_nterror(state->req, status)) {
 382                 DEBUG(2,("finddcs: No matching NBT <1c> server found\n"));
 383                 return;
 384         }
 385
 386         for (i=0; state->srv_addresses[i]; i++) {
 387                 DEBUG(4,("finddcs: NBT <1c> response %u at '%s'\n",
 388                          i, state->srv_addresses[i]));
 389         }
 390
 391         state->srv_address_index = 0;
 392
 393         finddcs_cldap_next_server(state);
 394 }
 395
 396
 397 /*
 398  * Having got a DNS SRV answer, fire off the first CLDAP request
 399  */
 400 static void finddcs_cldap_srv_resolved(struct composite_context *ctx)
 401 {
 402         struct finddcs_cldap_state *state =
 403                 talloc_get_type(ctx->async.private_data, struct finddcs_cldap_state);
 404         NTSTATUS status;
 405         unsigned i;
 406
 407         status = resolve_name_multiple_recv(ctx, state, &state->srv_addresses);
 408         if (tevent_req_nterror(state->req, status)) {
 409                 DEBUG(2,("finddcs: Failed to find SRV record for %s\n", state->srv_name));
 410                 return;
 411         }
 412
 413         for (i=0; state->srv_addresses[i]; i++) {
 414                 DEBUG(4,("finddcs: DNS SRV response %u at '%s'\n", i, state->srv_addresses[i]));
 415         }
 416
 417         state->srv_address_index = 0;
 418
 419         finddcs_cldap_next_server(state);
 420 }
 421
 422
 423 NTSTATUS finddcs_cldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct finddcs *io)
 424 {
 425         struct finddcs_cldap_state *state = tevent_req_data(req, struct finddcs_cldap_state);
 426         bool ok;
 427         NTSTATUS status;
 428
 429         ok = tevent_req_poll(req, state->ev);
 430         if (!ok) {
 431                 talloc_free(req);
 432                 return NT_STATUS_INTERNAL_ERROR;
 433         }
 434         if (tevent_req_is_nterror(req, &status)) {
 435                 tevent_req_received(req);
 436                 return status;
 437         }
 438
 439         talloc_steal(mem_ctx, state->netlogon);
 440         io->out.netlogon = state->netlogon->out.netlogon;
 441         io->out.address = talloc_steal(
 442                 mem_ctx, state->srv_addresses[state->srv_address_index]);
 443
 444         tevent_req_received(req);
 445         return NT_STATUS_OK;
 446 }
 447
 448 NTSTATUS finddcs_cldap(TALLOC_CTX *mem_ctx,
 449                        struct finddcs *io,
 450                        struct resolve_context *resolve_ctx,
 451                        struct tevent_context *event_ctx)
 452 {
 453         NTSTATUS status;
 454         struct tevent_req *req = finddcs_cldap_send(mem_ctx,
 455                                                     io,
 456                                                     resolve_ctx,
 457                                                     event_ctx);
 458         status = finddcs_cldap_recv(req, mem_ctx, io);
 459         talloc_free(req);
 460         return status;
 461 }