source4/winbind/wb_init_domain.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    A composite API for initializing a domain
   5
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
   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 "libcli/composite/composite.h"
  25 #include "winbind/wb_server.h"
  26 #include "smbd/service_task.h"
  27 #include "librpc/gen_ndr/ndr_netlogon.h"
  28 #include "librpc/gen_ndr/ndr_lsa_c.h"
  29 #include "librpc/gen_ndr/ndr_samr_c.h"
  30 #include "libcli/libcli.h"
  31
  32 #include "libcli/security/security.h"
  33
  34
  35 #include "auth/credentials/credentials.h"
  36 #include "param/param.h"
  37
  38 /*
  39  * Initialize a domain:
  40  *
  41  * - With schannel credentials, try to open the SMB connection and
  42  *   NETLOGON pipe with the machine creds. This works against W2k3SP1
  43  *   with an NTLMSSP session setup. Fall back to anonymous (for the CIFS level).
  44  *
  45  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  46  *   pipe.
  47  *
  48  * - Open LSA. If we have machine creds, try to open with SPNEGO or NTLMSSP. Fall back
  49  *   to schannel.
  50  *
  51  * - With queryinfopolicy, verify that we're talking to the right domain
  52  *
  53  * A bit complex, but with all the combinations I think it's the best we can
  54  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  55  * have a signed&sealed lsa connection on all of them.
  56  *
  57  * Not sure if it is overkill, but it seems to work.
  58  */
  59
  60 struct init_domain_state {
  61         struct composite_context *ctx;
  62         struct wbsrv_domain *domain;
  63         struct wbsrv_service *service;
  64
  65         struct lsa_ObjectAttribute objectattr;
  66         struct lsa_OpenPolicy2 lsa_openpolicy;
  67         struct lsa_QueryInfoPolicy queryinfo;
  68         union lsa_PolicyInformation *info;
  69 };
  70
  71 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  72 static void init_domain_recv_lsa_pipe(struct composite_context *ctx);
  73 static void init_domain_recv_lsa_policy(struct tevent_req *subreq);
  74 static void init_domain_recv_queryinfo(struct tevent_req *subreq);
  75 static void init_domain_recv_samr(struct composite_context *ctx);
  76
  77 static struct dcerpc_binding *init_domain_binding(struct init_domain_state *state,
  78                                                   const struct ndr_interface_table *table)
  79 {
  80         struct dcerpc_binding *binding;
  81         NTSTATUS status;
  82
  83         /* Make a binding string */
  84         {
  85                 char *s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
  86                 if (s == NULL) return NULL;
  87                 status = dcerpc_parse_binding(state, s, &binding);
  88                 talloc_free(s);
  89                 if (!NT_STATUS_IS_OK(status)) {
  90                         return NULL;
  91                 }
  92         }
  93
  94         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
  95         binding->target_hostname = state->domain->dc_name;
  96         binding->host = state->domain->dc_address;
  97
  98         /* This shouldn't make a network call, as the mappings for named pipes are well known */
  99         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx,
 100                                         state->service->task->lp_ctx);
 101         if (!NT_STATUS_IS_OK(status)) {
 102                 return NULL;
 103         }
 104
 105         return binding;
 106 }
 107
 108 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
 109                                               struct wbsrv_service *service,
 110                                               struct wb_dom_info *dom_info)
 111 {
 112         struct composite_context *result, *ctx;
 113         struct init_domain_state *state;
 114
 115         result = composite_create(mem_ctx, service->task->event_ctx);
 116         if (result == NULL) goto failed;
 117
 118         state = talloc_zero(result, struct init_domain_state);
 119         if (state == NULL) goto failed;
 120         state->ctx = result;
 121         result->private_data = state;
 122
 123         state->service = service;
 124
 125         state->domain = talloc(state, struct wbsrv_domain);
 126         if (state->domain == NULL) goto failed;
 127
 128         state->domain->info = talloc_reference(state->domain, dom_info);
 129         if (state->domain->info == NULL) goto failed;
 130
 131         state->domain->dc_name = dom_info->dc->name;
 132         state->domain->dc_address = dom_info->dc->address;
 133
 134         state->domain->libnet_ctx = libnet_context_init(service->task->event_ctx,
 135                                                         service->task->lp_ctx);
 136
 137         /* Create a credentials structure */
 138         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
 139         if (state->domain->libnet_ctx->cred == NULL) goto failed;
 140
 141         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
 142
 143         /* Connect the machine account to the credentials */
 144         state->ctx->status =
 145                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
 146         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 147
 148         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
 149
 150         state->domain->netlogon_pipe = NULL;
 151
 152         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
 153             ((lpcfg_server_role(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
 154              (lpcfg_server_role(service->task->lp_ctx) == ROLE_DOMAIN_CONTROLLER)) &&
 155             (dom_sid_equal(state->domain->info->sid,
 156                            state->service->primary_sid))) {
 157                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL | DCERPC_SCHANNEL_128;
 158
 159                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 160                 if (lpcfg_winbind_sealed_pipes(service->task->lp_ctx)) {
 161                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 162                 } else {
 163                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 164                 }
 165         }
 166
 167         /* No encryption on anonymous pipes */
 168
 169         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 170                                          &ndr_table_netlogon,
 171                                          state->domain->libnet_ctx->cred,
 172                                          service->task->event_ctx,
 173                                          service->task->lp_ctx);
 174
 175         if (composite_nomem(ctx, state->ctx)) {
 176                 goto failed;
 177         }
 178
 179         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 180                            state);
 181         return result;
 182  failed:
 183         talloc_free(result);
 184         return NULL;
 185 }
 186
 187 /* Having make a netlogon connection (possibly secured with schannel),
 188  * make an LSA connection to the same DC, on the same IPC$ share */
 189 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 190 {
 191         struct init_domain_state *state =
 192                 talloc_get_type(ctx->async.private_data,
 193                                 struct init_domain_state);
 194
 195         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain,
 196                                                    &state->domain->netlogon_pipe);
 197
 198         if (!composite_is_ok(state->ctx)) {
 199                 return;
 200         }
 201         talloc_reparent(state, state->domain->netlogon_pipe, state->domain->netlogon_binding);
 202
 203         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
 204
 205         /* For debugging, it can be a real pain if all the traffic is encrypted */
 206         if (lpcfg_winbind_sealed_pipes(state->service->task->lp_ctx)) {
 207                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 208         } else {
 209                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 210         }
 211
 212         state->domain->libnet_ctx->lsa.pipe = NULL;
 213
 214         /* this will make the secondary connection on the same IPC$ share,
 215            secured with SPNEGO or NTLMSSP */
 216         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 217                                                     state->domain->lsa_binding,
 218                                                     &ndr_table_lsarpc,
 219                                                     state->domain->libnet_ctx->cred,
 220                                                     state->domain->libnet_ctx->lp_ctx
 221                 );
 222         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 223 }
 224
 225 static bool retry_with_schannel(struct init_domain_state *state,
 226                                 struct dcerpc_binding *binding,
 227                                 const struct ndr_interface_table *table,
 228                                 void (*continuation)(struct composite_context *))
 229 {
 230         struct composite_context *ctx;
 231         state->ctx->status = NT_STATUS_OK;
 232         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 233             && !(binding->flags & DCERPC_SCHANNEL)) {
 234                 /* Opening a policy handle failed, perhaps it was
 235                  * because we don't get a 'wrong password' error on
 236                  * NTLMSSP binds */
 237
 238                 /* Try again with schannel */
 239                 binding->flags |= DCERPC_SCHANNEL;
 240
 241                 /* Try again, likewise on the same IPC$ share,
 242                    secured with SCHANNEL */
 243                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 244                                                             binding,
 245                                                             table,
 246                                                             state->domain->libnet_ctx->cred,
 247                                                             state->domain->libnet_ctx->lp_ctx);
 248                 composite_continue(state->ctx, ctx, continuation, state);
 249                 return true;
 250         } else {
 251                 return false;
 252         }
 253 }
 254 /* We should now have either an authenticated LSA pipe, or an error.
 255  * On success, open a policy handle
 256  */
 257 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 258 {
 259         struct init_domain_state *state =
 260                 talloc_get_type(ctx->async.private_data,
 261                                 struct init_domain_state);
 262         struct tevent_req *subreq;
 263
 264         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
 265                                                                    &state->domain->libnet_ctx->lsa.pipe);
 266         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 267                 if (retry_with_schannel(state, state->domain->lsa_binding,
 268                                         &ndr_table_lsarpc,
 269                                         init_domain_recv_lsa_pipe)) {
 270                         return;
 271                 }
 272         }
 273         if (!composite_is_ok(state->ctx)) return;
 274
 275         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
 276         talloc_reparent(state, state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
 277         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 278         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
 279
 280         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
 281         state->lsa_openpolicy.in.system_name =
 282                 talloc_asprintf(state, "\\\\%s",
 283                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
 284         ZERO_STRUCT(state->objectattr);
 285         state->lsa_openpolicy.in.attr = &state->objectattr;
 286         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 287         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
 288
 289         subreq = dcerpc_lsa_OpenPolicy2_r_send(state,
 290                                                state->ctx->event_ctx,
 291                                                state->domain->libnet_ctx->lsa.pipe->binding_handle,
 292                                                &state->lsa_openpolicy);
 293         if (composite_nomem(subreq, state->ctx)) return;
 294         tevent_req_set_callback(subreq, init_domain_recv_lsa_policy, state);
 295 }
 296
 297 /* Receive a policy handle (or not, and retry the authentication) and
 298  * obtain some basic information about the domain */
 299
 300 static void init_domain_recv_lsa_policy(struct tevent_req *subreq)
 301 {
 302         struct init_domain_state *state =
 303                 tevent_req_callback_data(subreq,
 304                 struct init_domain_state);
 305
 306         state->ctx->status = dcerpc_lsa_OpenPolicy2_r_recv(subreq, state);
 307         TALLOC_FREE(subreq);
 308         if ((!NT_STATUS_IS_OK(state->ctx->status)
 309               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 310                 if (retry_with_schannel(state, state->domain->lsa_binding,
 311                                         &ndr_table_lsarpc,
 312                                         init_domain_recv_lsa_pipe)) {
 313                         return;
 314                 }
 315         }
 316         if (!composite_is_ok(state->ctx)) return;
 317         state->ctx->status = state->lsa_openpolicy.out.result;
 318         if (!composite_is_ok(state->ctx)) return;
 319
 320         state->info = talloc_zero(state->ctx, union lsa_PolicyInformation);
 321         if (composite_nomem(state->info, state->ctx)) return;
 322
 323         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
 324         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 325         state->queryinfo.out.info = &state->info;
 326
 327         subreq = dcerpc_lsa_QueryInfoPolicy_r_send(state,
 328                                                    state->ctx->event_ctx,
 329                                                    state->domain->libnet_ctx->lsa.pipe->binding_handle,
 330                                                    &state->queryinfo);
 331         if (composite_nomem(subreq, state->ctx)) return;
 332         tevent_req_set_callback(subreq, init_domain_recv_queryinfo, state);
 333 }
 334
 335 static void init_domain_recv_queryinfo(struct tevent_req *subreq)
 336 {
 337         struct init_domain_state *state =
 338                 tevent_req_callback_data(subreq,
 339                 struct init_domain_state);
 340         struct lsa_DomainInfo *dominfo;
 341         struct composite_context *ctx;
 342
 343         state->ctx->status = dcerpc_lsa_QueryInfoPolicy_r_recv(subreq, state);
 344         TALLOC_FREE(subreq);
 345         if (!composite_is_ok(state->ctx)) return;
 346         state->ctx->status = state->queryinfo.out.result;
 347         if (!composite_is_ok(state->ctx)) return;
 348
 349         dominfo = &(*state->queryinfo.out.info)->account_domain;
 350
 351         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 352                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 353                           state->domain->info->name,
 354                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 355                           dominfo->name.string));
 356                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 357                 return;
 358         }
 359
 360         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 361                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 362                           dom_sid_string(state, state->domain->info->sid),
 363                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 364                           dom_sid_string(state, dominfo->sid)));
 365                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 366                 return;
 367         }
 368
 369         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
 370
 371         /* We want to use the same flags as the LSA pipe did (so, if
 372          * it needed schannel, then we need that here too) */
 373         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 374
 375         state->domain->libnet_ctx->samr.pipe = NULL;
 376
 377         ctx = wb_connect_samr_send(state, state->domain);
 378         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 379 }
 380
 381 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 382  * open an LDAP connection */
 383 static void init_domain_recv_samr(struct composite_context *ctx)
 384 {
 385         struct init_domain_state *state =
 386                 talloc_get_type(ctx->async.private_data,
 387                                 struct init_domain_state);
 388
 389         state->ctx->status = wb_connect_samr_recv(
 390                 ctx, state->domain,
 391                 &state->domain->libnet_ctx->samr.pipe,
 392                 &state->domain->libnet_ctx->samr.connect_handle,
 393                 &state->domain->libnet_ctx->samr.handle);
 394         if (!composite_is_ok(state->ctx)) return;
 395
 396         talloc_reparent(state, state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
 397         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 398         state->domain->libnet_ctx->samr.name = state->domain->info->name;
 399         state->domain->libnet_ctx->samr.sid = dom_sid_dup(
 400                                                 state->domain->libnet_ctx,
 401                                                 state->domain->info->sid);
 402
 403         composite_done(state->ctx);
 404 }
 405
 406 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 407                              TALLOC_CTX *mem_ctx,
 408                              struct wbsrv_domain **result)
 409 {
 410         NTSTATUS status = composite_wait(c);
 411         if (NT_STATUS_IS_OK(status)) {
 412                 struct init_domain_state *state =
 413                         talloc_get_type(c->private_data,
 414                                         struct init_domain_state);
 415                 *result = talloc_steal(mem_ctx, state->domain);
 416         }
 417         talloc_free(c);
 418         return status;
 419 }
 420
 421 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 422                         struct wb_dom_info *dom_info,
 423                         struct wbsrv_domain **result)
 424 {
 425         struct composite_context *c =
 426                 wb_init_domain_send(mem_ctx, service, dom_info);
 427         return wb_init_domain_recv(c, mem_ctx, result);
 428 }