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                                         state->service->task->lp_ctx);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 return NULL;
 108         }
 109
 110         return binding;
 111 }
 112
 113 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
 114                                               struct wbsrv_service *service,
 115                                               struct wb_dom_info *dom_info)
 116 {
 117         struct composite_context *result, *ctx;
 118         struct init_domain_state *state;
 119
 120         result = composite_create(mem_ctx, service->task->event_ctx);
 121         if (result == NULL) goto failed;
 122
 123         state = talloc_zero(result, struct init_domain_state);
 124         if (state == NULL) goto failed;
 125         state->ctx = result;
 126         result->private_data = state;
 127
 128         state->service = service;
 129
 130         state->domain = talloc(state, struct wbsrv_domain);
 131         if (state->domain == NULL) goto failed;
 132
 133         state->domain->info = talloc_reference(state->domain, dom_info);
 134         if (state->domain->info == NULL) goto failed;
 135
 136         /* Caller should check, but to be safe: */
 137         if (dom_info->num_dcs < 1) {
 138                 goto failed;
 139         }
 140
 141         /* For now, we just pick the first.  The next step will be to
 142          * walk the entire list.  Also need to fix finddcs() to return
 143          * the entire list */
 144         state->domain->dc_name = dom_info->dcs[0].name;
 145         state->domain->dc_address = dom_info->dcs[0].address;
 146
 147         state->domain->libnet_ctx = libnet_context_init(service->task->event_ctx,
 148                                                         service->task->lp_ctx);
 149
 150         /* Create a credentials structure */
 151         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
 152         if (state->domain->libnet_ctx->cred == NULL) goto failed;
 153
 154         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
 155
 156         /* Connect the machine account to the credentials */
 157         state->ctx->status =
 158                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
 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(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
 167              (lp_server_role(service->task->lp_ctx) == 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(service->task->lp_ctx)) {
 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                                          service->task->lp_ctx);
 187
 188         if (composite_nomem(ctx, state->ctx)) {
 189                 goto failed;
 190         }
 191
 192         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 193                            state);
 194         return result;
 195  failed:
 196         talloc_free(result);
 197         return NULL;
 198 }
 199
 200 /* Having make a netlogon connection (possibly secured with schannel),
 201  * make an LSA connection to the same DC, on the same IPC$ share */
 202 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 203 {
 204         struct init_domain_state *state =
 205                 talloc_get_type(ctx->async.private_data,
 206                                 struct init_domain_state);
 207
 208         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state->domain,
 209                                                    &state->domain->netlogon_pipe);
 210
 211         if (!composite_is_ok(state->ctx)) {
 212                 talloc_free(state->domain->netlogon_binding);
 213                 return;
 214         }
 215         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
 216
 217         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
 218
 219         /* For debugging, it can be a real pain if all the traffic is encrypted */
 220         if (lp_winbind_sealed_pipes(state->service->task->lp_ctx)) {
 221                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 222         } else {
 223                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 224         }
 225
 226         state->domain->libnet_ctx->lsa.pipe = NULL;
 227
 228         /* this will make the secondary connection on the same IPC$ share,
 229            secured with SPNEGO or NTLMSSP */
 230         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 231                                                     state->domain->lsa_binding,
 232                                                     &ndr_table_lsarpc,
 233                                                     state->domain->libnet_ctx->cred,
 234                                                     state->domain->libnet_ctx->lp_ctx
 235                 );
 236         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 237 }
 238
 239 static bool retry_with_schannel(struct init_domain_state *state,
 240                                 struct dcerpc_binding *binding,
 241                                 const struct ndr_interface_table *table,
 242                                 void (*continuation)(struct composite_context *))
 243 {
 244         struct composite_context *ctx;
 245         state->ctx->status = NT_STATUS_OK;
 246         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 247             && !(binding->flags & DCERPC_SCHANNEL)) {
 248                 /* Opening a policy handle failed, perhaps it was
 249                  * because we don't get a 'wrong password' error on
 250                  * NTLMSSP binds */
 251
 252                 /* Try again with schannel */
 253                 binding->flags |= DCERPC_SCHANNEL;
 254
 255                 /* Try again, likewise on the same IPC$ share,
 256                    secured with SCHANNEL */
 257                 ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 258                                                             binding,
 259                                                             table,
 260                                                             state->domain->libnet_ctx->cred,
 261                                                             state->domain->libnet_ctx->lp_ctx);
 262                 composite_continue(state->ctx, ctx, continuation, state);
 263                 return true;
 264         } else {
 265                 return false;
 266         }
 267 }
 268 /* We should now have either an authenticated LSA pipe, or an error.
 269  * On success, open a policy handle
 270  */
 271 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 272 {
 273         struct rpc_request *req;
 274         struct init_domain_state *state =
 275                 talloc_get_type(ctx->async.private_data,
 276                                 struct init_domain_state);
 277
 278         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
 279                                                                    &state->domain->libnet_ctx->lsa.pipe);
 280         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 281                 if (retry_with_schannel(state, state->domain->lsa_binding,
 282                                         &ndr_table_lsarpc,
 283                                         init_domain_recv_lsa_pipe)) {
 284                         return;
 285                 }
 286         }
 287         if (!composite_is_ok(state->ctx)) return;
 288
 289         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
 290         talloc_steal(state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
 291         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 292         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
 293
 294         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
 295         state->lsa_openpolicy.in.system_name =
 296                 talloc_asprintf(state, "\\\\%s",
 297                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
 298         ZERO_STRUCT(state->objectattr);
 299         state->lsa_openpolicy.in.attr = &state->objectattr;
 300         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 301         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
 302
 303         req = dcerpc_lsa_OpenPolicy2_send(state->domain->libnet_ctx->lsa.pipe, state,
 304                                           &state->lsa_openpolicy);
 305
 306         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
 307 }
 308
 309 /* Receive a policy handle (or not, and retry the authentication) and
 310  * obtain some basic information about the domain */
 311
 312 static void init_domain_recv_lsa_policy(struct rpc_request *req)
 313 {
 314         struct init_domain_state *state =
 315                 talloc_get_type(req->async.private_data,
 316                                 struct init_domain_state);
 317
 318         state->ctx->status = dcerpc_ndr_request_recv(req);
 319         if ((!NT_STATUS_IS_OK(state->ctx->status)
 320               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 321                 if (retry_with_schannel(state, state->domain->lsa_binding,
 322                                         &ndr_table_lsarpc,
 323                                         init_domain_recv_lsa_pipe)) {
 324                         return;
 325                 }
 326         }
 327         if (!composite_is_ok(state->ctx)) return;
 328         state->ctx->status = state->lsa_openpolicy.out.result;
 329         if (!composite_is_ok(state->ctx)) return;
 330
 331         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
 332         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 333
 334         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->libnet_ctx->lsa.pipe, state,
 335                                               &state->queryinfo);
 336         composite_continue_rpc(state->ctx, req,
 337                                init_domain_recv_queryinfo, state);
 338 }
 339
 340 static void init_domain_recv_queryinfo(struct rpc_request *req)
 341 {
 342         struct init_domain_state *state =
 343                 talloc_get_type(req->async.private_data, struct init_domain_state);
 344         struct lsa_DomainInfo *dominfo;
 345         struct composite_context *ctx;
 346
 347         state->ctx->status = dcerpc_ndr_request_recv(req);
 348         if (!composite_is_ok(state->ctx)) return;
 349         state->ctx->status = state->queryinfo.out.result;
 350         if (!composite_is_ok(state->ctx)) return;
 351
 352         dominfo = &state->queryinfo.out.info->account_domain;
 353
 354         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 355                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 356                           state->domain->info->name,
 357                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 358                           dominfo->name.string));
 359                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 360                 return;
 361         }
 362
 363         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 364                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 365                           dom_sid_string(state, state->domain->info->sid),
 366                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 367                           dom_sid_string(state, dominfo->sid)));
 368                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 369                 return;
 370         }
 371
 372         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
 373
 374         /* We want to use the same flags as the LSA pipe did (so, if
 375          * it needed schannel, then we need that here too) */
 376         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 377
 378         state->domain->libnet_ctx->samr.pipe = NULL;
 379
 380         ctx = wb_connect_samr_send(state, state->domain);
 381         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 382 }
 383
 384 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 385  * open an LDAP connection */
 386 static void init_domain_recv_samr(struct composite_context *ctx)
 387 {
 388         const char *ldap_url;
 389         struct init_domain_state *state =
 390                 talloc_get_type(ctx->async.private_data,
 391                                 struct init_domain_state);
 392
 393         state->ctx->status = wb_connect_samr_recv(
 394                 ctx, state->domain,
 395                 &state->domain->libnet_ctx->samr.pipe,
 396                 &state->domain->libnet_ctx->samr.handle,
 397                 &state->domain->libnet_ctx->samr.handle);
 398         if (!composite_is_ok(state->ctx)) return;
 399
 400         talloc_steal(state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
 401         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 402         state->domain->libnet_ctx->samr.name = state->domain->info->name;
 403         state->domain->libnet_ctx->samr.sid = state->domain->info->sid;
 404
 405         state->domain->ldap_conn =
 406                 ldap4_new_connection(state->domain, state->domain->libnet_ctx->lp_ctx, state->ctx->event_ctx);
 407         composite_nomem(state->domain->ldap_conn, state->ctx);
 408
 409         ldap_url = talloc_asprintf(state, "ldap://%s/",
 410                                    state->domain->dc_address);
 411         composite_nomem(ldap_url, state->ctx);
 412
 413         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 414         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 415 }
 416
 417 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 418 {
 419         struct init_domain_state *state =
 420                 talloc_get_type(ctx->async.private_data,
 421                                 struct init_domain_state);
 422
 423         state->ctx->status = ldap_connect_recv(ctx);
 424         if (NT_STATUS_IS_OK(state->ctx->status)) {
 425                 state->domain->ldap_conn->host =
 426                         talloc_strdup(state->domain->ldap_conn,
 427                                       state->domain->dc_name);
 428                 state->ctx->status =
 429                         ldap_bind_sasl(state->domain->ldap_conn,
 430                                        state->domain->libnet_ctx->cred,
 431                                        state->domain->libnet_ctx->lp_ctx);
 432                 DEBUG(0, ("ldap_bind returned %s\n",
 433                           nt_errstr(state->ctx->status)));
 434         }
 435
 436         composite_done(state->ctx);
 437 }
 438
 439 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 440                              TALLOC_CTX *mem_ctx,
 441                              struct wbsrv_domain **result)
 442 {
 443         NTSTATUS status = composite_wait(c);
 444         if (NT_STATUS_IS_OK(status)) {
 445                 struct init_domain_state *state =
 446                         talloc_get_type(c->private_data,
 447                                         struct init_domain_state);
 448                 *result = talloc_steal(mem_ctx, state->domain);
 449         }
 450         talloc_free(c);
 451         return status;
 452 }
 453
 454 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 455                         struct wb_dom_info *dom_info,
 456                         struct wbsrv_domain **result)
 457 {
 458         struct composite_context *c =
 459                 wb_init_domain_send(mem_ctx, service, dom_info);
 460         return wb_init_domain_recv(c, mem_ctx, result);
 461 }