source/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/composite/composite.h"
  26 #include "libcli/smb_composite/smb_composite.h"
  27 #include "winbind/wb_server.h"
  28 #include "winbind/wb_async_helpers.h"
  29 #include "winbind/wb_helper.h"
  30 #include "smbd/service_task.h"
  31 #include "librpc/gen_ndr/ndr_netlogon.h"
  32 #include "librpc/gen_ndr/ndr_lsa_c.h"
  33 #include "librpc/gen_ndr/ndr_samr_c.h"
  34 #include "libcli/libcli.h"
  35
  36 #include "libcli/auth/credentials.h"
  37 #include "libcli/security/security.h"
  38
  39 #include "libcli/ldap/ldap_client.h"
  40
  41 #include "auth/credentials/credentials.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 dcerpc_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         /* Create a credentials structure */
 147         state->domain->schannel_creds = cli_credentials_init(state->domain);
 148         if (state->domain->schannel_creds == NULL) goto failed;
 149
 150         cli_credentials_set_event_context(state->domain->schannel_creds, service->task->event_ctx);
 151
 152         cli_credentials_set_conf(state->domain->schannel_creds);
 153
 154         /* Connect the machine account to the credentials */
 155         state->ctx->status =
 156                 cli_credentials_set_machine_account(state->domain->
 157                                                     schannel_creds);
 158         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 159
 160         state->domain->netlogon_binding = init_domain_binding(state, &dcerpc_table_netlogon);
 161
 162         state->domain->netlogon_pipe = NULL;
 163
 164         if ((!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 165             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 166              (dom_sid_equal(state->domain->info->sid,
 167                             state->service->primary_sid)))) {
 168                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL;
 169
 170                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 171                 if (lp_winbind_sealed_pipes()) {
 172                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 173                 } else {
 174                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 175                 }
 176         }
 177
 178         /* No encryption on anonymous pipes */
 179
 180         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 181                                          &dcerpc_table_netlogon,
 182                                          state->domain->schannel_creds,
 183                                          service->task->event_ctx);
 184
 185         if (composite_nomem(ctx, state->ctx)) {
 186                 goto failed;
 187         }
 188
 189         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 190                            state);
 191         return result;
 192  failed:
 193         talloc_free(result);
 194         return NULL;
 195 }
 196
 197 /* Having make a netlogon connection (possibly secured with schannel),
 198  * make an LSA connection to the same DC, on the same IPC$ share */
 199 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 200 {
 201         struct init_domain_state *state =
 202                 talloc_get_type(ctx->async.private_data,
 203                                 struct init_domain_state);
 204
 205         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state,
 206                                                    &state->domain->netlogon_pipe);
 207
 208         if (!composite_is_ok(state->ctx)) {
 209                 talloc_free(state->domain->netlogon_binding);
 210                 return;
 211         }
 212         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
 213
 214         state->domain->lsa_binding = init_domain_binding(state, &dcerpc_table_lsarpc);
 215
 216         /* For debugging, it can be a real pain if all the traffic is encrypted */
 217         if (lp_winbind_sealed_pipes()) {
 218                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 219         } else {
 220                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 221         }
 222
 223         state->domain->lsa_pipe = NULL;
 224
 225         /* this will make the secondary connection on the same IPC$ share,
 226            secured with SPNEGO or NTLMSSP */
 227         ctx = dcerpc_secondary_connection_send(state->domain->netlogon_pipe,
 228                                                state->domain->lsa_binding);
 229         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 230 }
 231
 232 static bool retry_with_schannel(struct init_domain_state *state,
 233                                 struct dcerpc_binding *binding,
 234                                 void (*continuation)(struct composite_context *))
 235 {
 236         struct composite_context *ctx;
 237         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 238             && !(binding->flags & DCERPC_SCHANNEL)) {
 239                 /* Opening a policy handle failed, perhaps it was
 240                  * because we don't get a 'wrong password' error on
 241                  * NTLMSSP binds */
 242
 243                 /* Try again with schannel */
 244                 binding->flags |= DCERPC_SCHANNEL;
 245
 246                 /* Try again, likewise on the same IPC$ share,
 247                    secured with SCHANNEL */
 248                 ctx = dcerpc_secondary_connection_send(state->domain->netlogon_pipe,
 249                                                        binding);
 250                 composite_continue(state->ctx, ctx, continuation, state);
 251                 return true;
 252         } else {
 253                 return false;
 254         }
 255 }
 256 /* We should now have either an authenticated LSA pipe, or an error.
 257  * On success, open a policy handle
 258  */
 259 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 260 {
 261         struct rpc_request *req;
 262         struct init_domain_state *state =
 263                 talloc_get_type(ctx->async.private_data,
 264                                 struct init_domain_state);
 265
 266         state->ctx->status = dcerpc_secondary_connection_recv(ctx,
 267                                                               &state->domain->lsa_pipe);
 268         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 269                 if (retry_with_schannel(state, state->domain->lsa_binding,
 270                                         init_domain_recv_lsa_pipe)) {
 271                         return;
 272                 }
 273         }
 274         if (!composite_is_ok(state->ctx)) return;
 275
 276         talloc_steal(state->domain, state->domain->lsa_pipe);
 277         talloc_steal(state->domain->lsa_pipe, state->domain->lsa_binding);
 278
 279         state->domain->lsa_policy_handle = talloc(state, struct policy_handle);
 280         if (composite_nomem(state->domain->lsa_policy_handle, state->ctx)) return;
 281
 282         state->lsa_openpolicy.in.system_name =
 283                 talloc_asprintf(state, "\\\\%s",
 284                                 dcerpc_server_name(state->domain->lsa_pipe));
 285         ZERO_STRUCT(state->objectattr);
 286         state->lsa_openpolicy.in.attr = &state->objectattr;
 287         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 288         state->lsa_openpolicy.out.handle = state->domain->lsa_policy_handle;
 289
 290         req = dcerpc_lsa_OpenPolicy2_send(state->domain->lsa_pipe, state,
 291                                           &state->lsa_openpolicy);
 292
 293         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
 294 }
 295
 296 /* Receive a policy handle (or not, and retry the authentication) and
 297  * obtain some basic information about the domain */
 298
 299 static void init_domain_recv_lsa_policy(struct rpc_request *req)
 300 {
 301         struct init_domain_state *state =
 302                 talloc_get_type(req->async.private_data,
 303                                 struct init_domain_state);
 304
 305         state->ctx->status = dcerpc_ndr_request_recv(req);
 306         if (!(NT_STATUS_IS_OK(state->ctx->status)
 307               && NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 308                 if (retry_with_schannel(state, state->domain->lsa_binding,
 309                                         init_domain_recv_lsa_pipe)) {
 310                         return;
 311                 }
 312         }
 313         if (!composite_is_ok(state->ctx)) return;
 314         state->ctx->status = state->lsa_openpolicy.out.result;
 315         if (!composite_is_ok(state->ctx)) return;
 316
 317         state->queryinfo.in.handle = state->domain->lsa_policy_handle;
 318         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 319
 320         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 321                                               &state->queryinfo);
 322         composite_continue_rpc(state->ctx, req,
 323                                init_domain_recv_queryinfo, state);
 324 }
 325
 326 static void init_domain_recv_queryinfo(struct rpc_request *req)
 327 {
 328         struct init_domain_state *state =
 329                 talloc_get_type(req->async.private_data, struct init_domain_state);
 330         struct lsa_DomainInfo *dominfo;
 331         struct composite_context *ctx;
 332
 333         state->ctx->status = dcerpc_ndr_request_recv(req);
 334         if (!composite_is_ok(state->ctx)) return;
 335         state->ctx->status = state->queryinfo.out.result;
 336         if (!composite_is_ok(state->ctx)) return;
 337
 338         dominfo = &state->queryinfo.out.info->account_domain;
 339
 340         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 341                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 342                           state->domain->info->name,
 343                           dcerpc_server_name(state->domain->lsa_pipe),
 344                           dominfo->name.string));
 345                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 346                 return;
 347         }
 348
 349         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 350                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 351                           dom_sid_string(state, state->domain->info->sid),
 352                           dcerpc_server_name(state->domain->lsa_pipe),
 353                           dom_sid_string(state, dominfo->sid)));
 354                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 355                 return;
 356         }
 357
 358         state->domain->samr_binding = init_domain_binding(state, &dcerpc_table_samr);
 359
 360         /* We want to use the same flags as the LSA pipe did (so, if
 361          * it needed schannel, then we need that here too) */
 362         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 363
 364         state->domain->samr_pipe = NULL;
 365
 366         ctx = wb_connect_samr_send(state, state->domain);
 367         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 368 }
 369
 370 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 371  * open an LDAP connection */
 372 static void init_domain_recv_samr(struct composite_context *ctx)
 373 {
 374         const char *ldap_url;
 375         struct init_domain_state *state =
 376                 talloc_get_type(ctx->async.private_data,
 377                                 struct init_domain_state);
 378
 379         state->ctx->status = wb_connect_samr_recv(
 380                 ctx, state->domain,
 381                 &state->domain->samr_pipe,
 382                 &state->domain->samr_handle,
 383                 &state->domain->domain_handle);
 384         if (!composite_is_ok(state->ctx)) return;
 385
 386         talloc_steal(state->domain->samr_pipe, state->domain->samr_binding);
 387
 388         state->domain->ldap_conn =
 389                 ldap4_new_connection(state->domain, state->ctx->event_ctx);
 390         composite_nomem(state->domain->ldap_conn, state->ctx);
 391
 392         ldap_url = talloc_asprintf(state, "ldap://%s/",
 393                                    state->domain->dc_address);
 394         composite_nomem(ldap_url, state->ctx);
 395
 396         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 397         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 398 }
 399
 400 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 401 {
 402         struct init_domain_state *state =
 403                 talloc_get_type(ctx->async.private_data,
 404                                 struct init_domain_state);
 405
 406         state->ctx->status = ldap_connect_recv(ctx);
 407         if (NT_STATUS_IS_OK(state->ctx->status)) {
 408                 state->domain->ldap_conn->host =
 409                         talloc_strdup(state->domain->ldap_conn,
 410                                       state->domain->dc_name);
 411                 state->ctx->status =
 412                         ldap_bind_sasl(state->domain->ldap_conn,
 413                                        state->domain->schannel_creds);
 414                 DEBUG(0, ("ldap_bind returned %s\n",
 415                           nt_errstr(state->ctx->status)));
 416         }
 417
 418         composite_done(state->ctx);
 419 }
 420
 421 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 422                              TALLOC_CTX *mem_ctx,
 423                              struct wbsrv_domain **result)
 424 {
 425         NTSTATUS status = composite_wait(c);
 426         if (NT_STATUS_IS_OK(status)) {
 427                 struct init_domain_state *state =
 428                         talloc_get_type(c->private_data,
 429                                         struct init_domain_state);
 430                 *result = talloc_steal(mem_ctx, state->domain);
 431         }
 432         talloc_free(c);
 433         return status;
 434 }
 435
 436 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 437                         struct wb_dom_info *dom_info,
 438                         struct wbsrv_domain **result)
 439 {
 440         struct composite_context *c =
 441                 wb_init_domain_send(mem_ctx, service, dom_info);
 442         return wb_init_domain_recv(c, mem_ctx, result);
 443 }