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         char *s;
  82         NTSTATUS status;
  83
  84         /* Make a binding string */
  85         if ((lpcfg_server_role(state->service->task->lp_ctx) != ROLE_DOMAIN_MEMBER) &&
  86             dom_sid_equal(state->domain->info->sid, state->service->primary_sid) &&
  87             state->service->sec_channel_type != SEC_CHAN_RODC) {
  88                 s = talloc_asprintf(state, "ncalrpc:%s", state->domain->dc_name);
  89                 if (s == NULL) return NULL;
  90         } else {
  91                 s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
  92                 if (s == NULL) return NULL;
  93
  94         }
  95         status = dcerpc_parse_binding(state, s, &binding);
  96         talloc_free(s);
  97         if (!NT_STATUS_IS_OK(status)) {
  98                 return NULL;
  99         }
 100
 101         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
 102         binding->target_hostname = state->domain->dc_name;
 103         binding->host = state->domain->dc_address;
 104
 105         if (binding->transport == NCALRPC) {
 106                 return binding;
 107         }
 108
 109         /* This shouldn't make a network call, as the mappings for named pipes are well known */
 110         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx,
 111                                         state->service->task->lp_ctx);
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 return NULL;
 114         }
 115
 116         return binding;
 117 }
 118
 119 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
 120                                               struct wbsrv_service *service,
 121                                               struct wb_dom_info *dom_info)
 122 {
 123         struct composite_context *result, *ctx;
 124         struct init_domain_state *state;
 125
 126         result = composite_create(mem_ctx, service->task->event_ctx);
 127         if (result == NULL) goto failed;
 128
 129         state = talloc_zero(result, struct init_domain_state);
 130         if (state == NULL) goto failed;
 131         state->ctx = result;
 132         result->private_data = state;
 133
 134         state->service = service;
 135
 136         state->domain = talloc(state, struct wbsrv_domain);
 137         if (state->domain == NULL) goto failed;
 138
 139         state->domain->info = talloc_reference(state->domain, dom_info);
 140         if (state->domain->info == NULL) goto failed;
 141
 142         state->domain->dc_name = dom_info->dc->name;
 143         state->domain->dc_address = dom_info->dc->address;
 144
 145         state->domain->libnet_ctx = libnet_context_init(service->task->event_ctx,
 146                                                         service->task->lp_ctx);
 147
 148         /* Create a credentials structure */
 149         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
 150         if (state->domain->libnet_ctx->cred == NULL) goto failed;
 151
 152         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
 153
 154         /* Connect the machine account to the credentials */
 155         state->ctx->status =
 156                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
 157         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 158
 159         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
 160
 161         state->domain->netlogon_pipe = NULL;
 162
 163         state->domain->netlogon_queue = tevent_queue_create(state->domain,
 164                                                             "netlogon_queue");
 165         if (state->domain->netlogon_queue == NULL) goto failed;
 166
 167         /* We start the queue when the connection is usable */
 168         tevent_queue_stop(state->domain->netlogon_queue);
 169
 170         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
 171             ((lpcfg_server_role(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
 172              (lpcfg_server_role(service->task->lp_ctx) == ROLE_ACTIVE_DIRECTORY_DC)) &&
 173             (dom_sid_equal(state->domain->info->sid,
 174                            state->service->primary_sid))) {
 175                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL | DCERPC_SCHANNEL_AUTO;
 176
 177                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 178                 if (lpcfg_winbind_sealed_pipes(service->task->lp_ctx)) {
 179                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 180                 } else {
 181                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 182                 }
 183         }
 184
 185         /* No encryption on anonymous pipes */
 186
 187         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 188                                          &ndr_table_netlogon,
 189                                          state->domain->libnet_ctx->cred,
 190                                          service->task->event_ctx,
 191                                          service->task->lp_ctx);
 192
 193         if (composite_nomem(ctx, state->ctx)) {
 194                 goto failed;
 195         }
 196
 197         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 198                            state);
 199         return result;
 200  failed:
 201         talloc_free(result);
 202         return NULL;
 203 }
 204
 205 /* Having make a netlogon connection (possibly secured with schannel),
 206  * make an LSA connection to the same DC, on the same IPC$ share */
 207 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 208 {
 209         struct init_domain_state *state =
 210                 talloc_get_type(ctx->async.private_data,
 211                                 struct init_domain_state);
 212
 213         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain,
 214                                                    &state->domain->netlogon_pipe);
 215
 216         if (!composite_is_ok(state->ctx)) {
 217                 return;
 218         }
 219         talloc_reparent(state, state->domain->netlogon_pipe, state->domain->netlogon_binding);
 220
 221         /* the netlogon connection is ready */
 222         tevent_queue_start(state->domain->netlogon_queue);
 223
 224         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
 225
 226         /* For debugging, it can be a real pain if all the traffic is encrypted */
 227         if (lpcfg_winbind_sealed_pipes(state->service->task->lp_ctx)) {
 228                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 229         } else {
 230                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 231         }
 232
 233         state->domain->libnet_ctx->lsa.pipe = NULL;
 234
 235         /* this will make the secondary connection on the same IPC$ share,
 236            secured with SPNEGO or NTLMSSP */
 237         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 238                                                     state->domain->lsa_binding,
 239                                                     &ndr_table_lsarpc,
 240                                                     state->domain->libnet_ctx->cred,
 241                                                     state->domain->libnet_ctx->lp_ctx
 242                 );
 243         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 244 }
 245
 246 static bool retry_with_schannel(struct init_domain_state *state,
 247                                 struct dcerpc_binding *binding,
 248                                 const struct ndr_interface_table *table,
 249                                 void (*continuation)(struct composite_context *))
 250 {
 251         struct composite_context *ctx;
 252         state->ctx->status = NT_STATUS_OK;
 253         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 254             && !(binding->flags & DCERPC_SCHANNEL)) {
 255                 /* Opening a policy handle failed, perhaps it was
 256                  * because we don't get a 'wrong password' error on
 257                  * NTLMSSP binds */
 258
 259                 /* Try again with schannel */
 260                 binding->flags |= DCERPC_SCHANNEL | DCERPC_SCHANNEL_AUTO;
 261
 262                 /* Try again, likewise on the same IPC$ share,
 263                    secured with SCHANNEL */
 264                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 265                                                             binding,
 266                                                             table,
 267                                                             state->domain->libnet_ctx->cred,
 268                                                             state->domain->libnet_ctx->lp_ctx);
 269                 composite_continue(state->ctx, ctx, continuation, state);
 270                 return true;
 271         } else {
 272                 return false;
 273         }
 274 }
 275 /* We should now have either an authenticated LSA pipe, or an error.
 276  * On success, open a policy handle
 277  */
 278 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 279 {
 280         struct init_domain_state *state =
 281                 talloc_get_type(ctx->async.private_data,
 282                                 struct init_domain_state);
 283         struct tevent_req *subreq;
 284
 285         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
 286                                                                    &state->domain->libnet_ctx->lsa.pipe);
 287         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 288                 if (retry_with_schannel(state, state->domain->lsa_binding,
 289                                         &ndr_table_lsarpc,
 290                                         init_domain_recv_lsa_pipe)) {
 291                         return;
 292                 }
 293         }
 294         if (!composite_is_ok(state->ctx)) return;
 295
 296         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
 297         talloc_reparent(state, state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
 298         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 299         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
 300
 301         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
 302         state->lsa_openpolicy.in.system_name =
 303                 talloc_asprintf(state, "\\\\%s",
 304                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
 305         ZERO_STRUCT(state->objectattr);
 306         state->lsa_openpolicy.in.attr = &state->objectattr;
 307         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 308         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
 309
 310         subreq = dcerpc_lsa_OpenPolicy2_r_send(state,
 311                                                state->ctx->event_ctx,
 312                                                state->domain->libnet_ctx->lsa.pipe->binding_handle,
 313                                                &state->lsa_openpolicy);
 314         if (composite_nomem(subreq, state->ctx)) return;
 315         tevent_req_set_callback(subreq, init_domain_recv_lsa_policy, state);
 316 }
 317
 318 /* Receive a policy handle (or not, and retry the authentication) and
 319  * obtain some basic information about the domain */
 320
 321 static void init_domain_recv_lsa_policy(struct tevent_req *subreq)
 322 {
 323         struct init_domain_state *state =
 324                 tevent_req_callback_data(subreq,
 325                 struct init_domain_state);
 326
 327         state->ctx->status = dcerpc_lsa_OpenPolicy2_r_recv(subreq, state);
 328         TALLOC_FREE(subreq);
 329         if ((!NT_STATUS_IS_OK(state->ctx->status)
 330               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 331                 if (retry_with_schannel(state, state->domain->lsa_binding,
 332                                         &ndr_table_lsarpc,
 333                                         init_domain_recv_lsa_pipe)) {
 334                         return;
 335                 }
 336         }
 337         if (!composite_is_ok(state->ctx)) return;
 338         state->ctx->status = state->lsa_openpolicy.out.result;
 339         if (!composite_is_ok(state->ctx)) return;
 340
 341         state->info = talloc_zero(state->ctx, union lsa_PolicyInformation);
 342         if (composite_nomem(state->info, state->ctx)) return;
 343
 344         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
 345         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 346         state->queryinfo.out.info = &state->info;
 347
 348         subreq = dcerpc_lsa_QueryInfoPolicy_r_send(state,
 349                                                    state->ctx->event_ctx,
 350                                                    state->domain->libnet_ctx->lsa.pipe->binding_handle,
 351                                                    &state->queryinfo);
 352         if (composite_nomem(subreq, state->ctx)) return;
 353         tevent_req_set_callback(subreq, init_domain_recv_queryinfo, state);
 354 }
 355
 356 static void init_domain_recv_queryinfo(struct tevent_req *subreq)
 357 {
 358         struct init_domain_state *state =
 359                 tevent_req_callback_data(subreq,
 360                 struct init_domain_state);
 361         struct lsa_DomainInfo *dominfo;
 362         struct composite_context *ctx;
 363
 364         state->ctx->status = dcerpc_lsa_QueryInfoPolicy_r_recv(subreq, state);
 365         TALLOC_FREE(subreq);
 366         if (!composite_is_ok(state->ctx)) return;
 367         state->ctx->status = state->queryinfo.out.result;
 368         if (!composite_is_ok(state->ctx)) return;
 369
 370         dominfo = &(*state->queryinfo.out.info)->account_domain;
 371
 372         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 373                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 374                           state->domain->info->name,
 375                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 376                           dominfo->name.string));
 377                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 378                 return;
 379         }
 380
 381         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 382                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 383                           dom_sid_string(state, state->domain->info->sid),
 384                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 385                           dom_sid_string(state, dominfo->sid)));
 386                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 387                 return;
 388         }
 389
 390         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
 391
 392         /* We want to use the same flags as the LSA pipe did (so, if
 393          * it needed schannel, then we need that here too) */
 394         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 395
 396         state->domain->libnet_ctx->samr.pipe = NULL;
 397
 398         ctx = wb_connect_samr_send(state, state->domain);
 399         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 400 }
 401
 402 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 403  * open an LDAP connection */
 404 static void init_domain_recv_samr(struct composite_context *ctx)
 405 {
 406         struct init_domain_state *state =
 407                 talloc_get_type(ctx->async.private_data,
 408                                 struct init_domain_state);
 409
 410         state->ctx->status = wb_connect_samr_recv(
 411                 ctx, state->domain,
 412                 &state->domain->libnet_ctx->samr.pipe,
 413                 &state->domain->libnet_ctx->samr.connect_handle,
 414                 &state->domain->libnet_ctx->samr.handle);
 415         if (!composite_is_ok(state->ctx)) return;
 416
 417         talloc_reparent(state, state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
 418         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 419         state->domain->libnet_ctx->samr.name = state->domain->info->name;
 420         state->domain->libnet_ctx->samr.sid = dom_sid_dup(
 421                                                 state->domain->libnet_ctx,
 422                                                 state->domain->info->sid);
 423
 424         composite_done(state->ctx);
 425 }
 426
 427 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 428                              TALLOC_CTX *mem_ctx,
 429                              struct wbsrv_domain **result)
 430 {
 431         NTSTATUS status = composite_wait(c);
 432         if (NT_STATUS_IS_OK(status)) {
 433                 struct init_domain_state *state =
 434                         talloc_get_type(c->private_data,
 435                                         struct init_domain_state);
 436                 *result = talloc_steal(mem_ctx, state->domain);
 437         }
 438         talloc_free(c);
 439         return status;
 440 }
 441
 442 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 443                         struct wb_dom_info *dom_info,
 444                         struct wbsrv_domain **result)
 445 {
 446         struct composite_context *c =
 447                 wb_init_domain_send(mem_ctx, service, dom_info);
 448         return wb_init_domain_recv(c, mem_ctx, result);
 449 }