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 "libcli/smb_composite/smb_composite.h"
  26 #include "winbind/wb_server.h"
  27 #include "winbind/wb_async_helpers.h"
  28 #include "winbind/wb_helper.h"
  29 #include "smbd/service_task.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "librpc/gen_ndr/ndr_lsa_c.h"
  32 #include "librpc/gen_ndr/ndr_samr_c.h"
  33 #include "libcli/libcli.h"
  34
  35 #include "libcli/auth/credentials.h"
  36 #include "libcli/security/security.h"
  37
  38 #include "libcli/ldap/ldap_client.h"
  39
  40 #include "auth/credentials/credentials.h"
  41 #include "param/param.h"
  42
  43 /*
  44  * Initialize a domain:
  45  *
  46  * - With schannel credentials, try to open the SMB connection and
  47  *   NETLOGON pipe with the machine creds. This works against W2k3SP1
  48  *   with an NTLMSSP session setup. Fall back to anonymous (for the CIFS level).
  49  *
  50  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  51  *   pipe.
  52  *
  53  * - Open LSA. If we have machine creds, try to open with SPNEGO or NTLMSSP. Fall back
  54  *   to schannel.
  55  *
  56  * - With queryinfopolicy, verify that we're talking to the right domain
  57  *
  58  * A bit complex, but with all the combinations I think it's the best we can
  59  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  60  * have a signed&sealed lsa connection on all of them.
  61  *
  62  * Not sure if it is overkill, but it seems to work.
  63  */
  64
  65 struct init_domain_state {
  66         struct composite_context *ctx;
  67         struct wbsrv_domain *domain;
  68         struct wbsrv_service *service;
  69
  70         struct lsa_ObjectAttribute objectattr;
  71         struct lsa_OpenPolicy2 lsa_openpolicy;
  72         struct lsa_QueryInfoPolicy queryinfo;
  73 };
  74
  75 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  76 static void init_domain_recv_lsa_pipe(struct composite_context *ctx);
  77 static void init_domain_recv_lsa_policy(struct rpc_request *req);
  78 static void init_domain_recv_queryinfo(struct rpc_request *req);
  79 static void init_domain_recv_ldapconn(struct composite_context *ctx);
  80 static void init_domain_recv_samr(struct composite_context *ctx);
  81
  82 static struct dcerpc_binding *init_domain_binding(struct init_domain_state *state,
  83                                                   const struct ndr_interface_table *table)
  84 {
  85         struct dcerpc_binding *binding;
  86         NTSTATUS status;
  87
  88         /* Make a binding string */
  89         {
  90                 char *s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
  91                 if (s == NULL) return NULL;
  92                 status = dcerpc_parse_binding(state, s, &binding);
  93                 talloc_free(s);
  94                 if (!NT_STATUS_IS_OK(status)) {
  95                         return NULL;
  96                 }
  97         }
  98
  99         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
 100         binding->target_hostname = state->domain->dc_name;
 101         binding->host = state->domain->dc_address;
 102
 103         /* This shouldn't make a network call, as the mappings for named pipes are well known */
 104         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx);
 105         if (!NT_STATUS_IS_OK(status)) {
 106                 return NULL;
 107         }
 108
 109         return binding;
 110 }
 111
 112 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
 113                                               struct wbsrv_service *service,
 114                                               struct wb_dom_info *dom_info)
 115 {
 116         struct composite_context *result, *ctx;
 117         struct init_domain_state *state;
 118
 119         result = composite_create(mem_ctx, service->task->event_ctx);
 120         if (result == NULL) goto failed;
 121
 122         state = talloc_zero(result, struct init_domain_state);
 123         if (state == NULL) goto failed;
 124         state->ctx = result;
 125         result->private_data = state;
 126
 127         state->service = service;
 128
 129         state->domain = talloc(state, struct wbsrv_domain);
 130         if (state->domain == NULL) goto failed;
 131
 132         state->domain->info = talloc_reference(state->domain, dom_info);
 133         if (state->domain->info == NULL) goto failed;
 134
 135         /* Caller should check, but to be safe: */
 136         if (dom_info->num_dcs < 1) {
 137                 goto failed;
 138         }
 139
 140         /* For now, we just pick the first.  The next step will be to
 141          * walk the entire list.  Also need to fix finddcs() to return
 142          * the entire list */
 143         state->domain->dc_name = dom_info->dcs[0].name;
 144         state->domain->dc_address = dom_info->dcs[0].address;
 145
 146         state->domain->libnet_ctx = libnet_context_init(service->task->event_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_event_context(state->domain->libnet_ctx->cred, service->task->event_ctx);
 153
 154         cli_credentials_set_conf(state->domain->libnet_ctx->cred);
 155
 156         /* Connect the machine account to the credentials */
 157         state->ctx->status =
 158                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred);
 159         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 160
 161         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
 162
 163         state->domain->netlogon_pipe = NULL;
 164
 165         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
 166             ((lp_server_role() == ROLE_DOMAIN_MEMBER) ||
 167              (lp_server_role() == ROLE_DOMAIN_CONTROLLER)) &&
 168             (dom_sid_equal(state->domain->info->sid,
 169                            state->service->primary_sid))) {
 170                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL;
 171
 172                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 173                 if (lp_winbind_sealed_pipes()) {
 174                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 175                 } else {
 176                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 177                 }
 178         }
 179
 180         /* No encryption on anonymous pipes */
 181
 182         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 183                                          &ndr_table_netlogon,
 184                                          state->domain->libnet_ctx->cred,
 185                                          service->task->event_ctx);
 186
 187         if (composite_nomem(ctx, state->ctx)) {
 188                 goto failed;
 189         }
 190
 191         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 192                            state);
 193         return result;
 194  failed:
 195         talloc_free(result);
 196         return NULL;
 197 }
 198
 199 /* Having make a netlogon connection (possibly secured with schannel),
 200  * make an LSA connection to the same DC, on the same IPC$ share */
 201 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 202 {
 203         struct init_domain_state *state =
 204                 talloc_get_type(ctx->async.private_data,
 205                                 struct init_domain_state);
 206
 207         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain,
 208                                                    &state->domain->netlogon_pipe);
 209
 210         if (!composite_is_ok(state->ctx)) {
 211                 talloc_free(state->domain->netlogon_binding);
 212                 return;
 213         }
 214         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
 215
 216         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
 217
 218         /* For debugging, it can be a real pain if all the traffic is encrypted */
 219         if (lp_winbind_sealed_pipes()) {
 220                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 221         } else {
 222                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 223         }
 224
 225         state->domain->libnet_ctx->lsa.pipe = NULL;
 226
 227         /* this will make the secondary connection on the same IPC$ share,
 228            secured with SPNEGO or NTLMSSP */
 229         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 230                                                     state->domain->lsa_binding,
 231                                                     &ndr_table_lsarpc,
 232                                                     state->domain->libnet_ctx->cred
 233                 );
 234         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 235 }
 236
 237 static bool retry_with_schannel(struct init_domain_state *state,
 238                                 struct dcerpc_binding *binding,
 239                                 const struct ndr_interface_table *table,
 240                                 void (*continuation)(struct composite_context *))
 241 {
 242         struct composite_context *ctx;
 243         state->ctx->status = NT_STATUS_OK;
 244         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 245             && !(binding->flags & DCERPC_SCHANNEL)) {
 246                 /* Opening a policy handle failed, perhaps it was
 247                  * because we don't get a 'wrong password' error on
 248                  * NTLMSSP binds */
 249
 250                 /* Try again with schannel */
 251                 binding->flags |= DCERPC_SCHANNEL;
 252
 253                 /* Try again, likewise on the same IPC$ share,
 254                    secured with SCHANNEL */
 255                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 256                                                             binding,
 257                                                             table,
 258                                                             state->domain->libnet_ctx->cred);
 259                 composite_continue(state->ctx, ctx, continuation, state);
 260                 return true;
 261         } else {
 262                 return false;
 263         }
 264 }
 265 /* We should now have either an authenticated LSA pipe, or an error.
 266  * On success, open a policy handle
 267  */
 268 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 269 {
 270         struct rpc_request *req;
 271         struct init_domain_state *state =
 272                 talloc_get_type(ctx->async.private_data,
 273                                 struct init_domain_state);
 274
 275         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
 276                                                                    &state->domain->libnet_ctx->lsa.pipe);
 277         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 278                 if (retry_with_schannel(state, state->domain->lsa_binding,
 279                                         &ndr_table_lsarpc,
 280                                         init_domain_recv_lsa_pipe)) {
 281                         return;
 282                 }
 283         }
 284         if (!composite_is_ok(state->ctx)) return;
 285
 286         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
 287         talloc_steal(state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
 288         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 289         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
 290
 291         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
 292         state->lsa_openpolicy.in.system_name =
 293                 talloc_asprintf(state, "\\\\%s",
 294                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
 295         ZERO_STRUCT(state->objectattr);
 296         state->lsa_openpolicy.in.attr = &state->objectattr;
 297         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 298         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
 299
 300         req = dcerpc_lsa_OpenPolicy2_send(state->domain->libnet_ctx->lsa.pipe, state,
 301                                           &state->lsa_openpolicy);
 302
 303         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
 304 }
 305
 306 /* Receive a policy handle (or not, and retry the authentication) and
 307  * obtain some basic information about the domain */
 308
 309 static void init_domain_recv_lsa_policy(struct rpc_request *req)
 310 {
 311         struct init_domain_state *state =
 312                 talloc_get_type(req->async.private_data,
 313                                 struct init_domain_state);
 314
 315         state->ctx->status = dcerpc_ndr_request_recv(req);
 316         if ((!NT_STATUS_IS_OK(state->ctx->status)
 317               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 318                 if (retry_with_schannel(state, state->domain->lsa_binding,
 319                                         &ndr_table_lsarpc,
 320                                         init_domain_recv_lsa_pipe)) {
 321                         return;
 322                 }
 323         }
 324         if (!composite_is_ok(state->ctx)) return;
 325         state->ctx->status = state->lsa_openpolicy.out.result;
 326         if (!composite_is_ok(state->ctx)) return;
 327
 328         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
 329         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 330
 331         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->libnet_ctx->lsa.pipe, state,
 332                                               &state->queryinfo);
 333         composite_continue_rpc(state->ctx, req,
 334                                init_domain_recv_queryinfo, state);
 335 }
 336
 337 static void init_domain_recv_queryinfo(struct rpc_request *req)
 338 {
 339         struct init_domain_state *state =
 340                 talloc_get_type(req->async.private_data, struct init_domain_state);
 341         struct lsa_DomainInfo *dominfo;
 342         struct composite_context *ctx;
 343
 344         state->ctx->status = dcerpc_ndr_request_recv(req);
 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         const char *ldap_url;
 386         struct init_domain_state *state =
 387                 talloc_get_type(ctx->async.private_data,
 388                                 struct init_domain_state);
 389
 390         state->ctx->status = wb_connect_samr_recv(
 391                 ctx, state->domain,
 392                 &state->domain->libnet_ctx->samr.pipe,
 393                 &state->domain->libnet_ctx->samr.handle,
 394                 &state->domain->libnet_ctx->samr.handle);
 395         if (!composite_is_ok(state->ctx)) return;
 396
 397         talloc_steal(state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
 398         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 399         state->domain->libnet_ctx->samr.name = state->domain->info->name;
 400         state->domain->libnet_ctx->samr.sid = state->domain->info->sid;
 401
 402         state->domain->ldap_conn =
 403                 ldap4_new_connection(state->domain, state->ctx->event_ctx);
 404         composite_nomem(state->domain->ldap_conn, state->ctx);
 405
 406         ldap_url = talloc_asprintf(state, "ldap://%s/",
 407                                    state->domain->dc_address);
 408         composite_nomem(ldap_url, state->ctx);
 409
 410         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 411         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 412 }
 413
 414 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 415 {
 416         struct init_domain_state *state =
 417                 talloc_get_type(ctx->async.private_data,
 418                                 struct init_domain_state);
 419
 420         state->ctx->status = ldap_connect_recv(ctx);
 421         if (NT_STATUS_IS_OK(state->ctx->status)) {
 422                 state->domain->ldap_conn->host =
 423                         talloc_strdup(state->domain->ldap_conn,
 424                                       state->domain->dc_name);
 425                 state->ctx->status =
 426                         ldap_bind_sasl(state->domain->ldap_conn,
 427                                        state->domain->libnet_ctx->cred);
 428                 DEBUG(0, ("ldap_bind returned %s\n",
 429                           nt_errstr(state->ctx->status)));
 430         }
 431
 432         composite_done(state->ctx);
 433 }
 434
 435 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 436                              TALLOC_CTX *mem_ctx,
 437                              struct wbsrv_domain **result)
 438 {
 439         NTSTATUS status = composite_wait(c);
 440         if (NT_STATUS_IS_OK(status)) {
 441                 struct init_domain_state *state =
 442                         talloc_get_type(c->private_data,
 443                                         struct init_domain_state);
 444                 *result = talloc_steal(mem_ctx, state->domain);
 445         }
 446         talloc_free(c);
 447         return status;
 448 }
 449
 450 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 451                         struct wb_dom_info *dom_info,
 452                         struct wbsrv_domain **result)
 453 {
 454         struct composite_context *c =
 455                 wb_init_domain_send(mem_ctx, service, dom_info);
 456         return wb_init_domain_recv(c, mem_ctx, result);
 457 }