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_samr(struct composite_context *ctx);
  80
  81 static struct dcerpc_binding *init_domain_binding(struct init_domain_state *state,
  82                                                   const struct ndr_interface_table *table)
  83 {
  84         struct dcerpc_binding *binding;
  85         NTSTATUS status;
  86
  87         /* Make a binding string */
  88         {
  89                 char *s = talloc_asprintf(state, "ncacn_np:%s", state->domain->dc_name);
  90                 if (s == NULL) return NULL;
  91                 status = dcerpc_parse_binding(state, s, &binding);
  92                 talloc_free(s);
  93                 if (!NT_STATUS_IS_OK(status)) {
  94                         return NULL;
  95                 }
  96         }
  97
  98         /* Alter binding to contain hostname, but also address (so we don't look it up twice) */
  99         binding->target_hostname = state->domain->dc_name;
 100         binding->host = state->domain->dc_address;
 101
 102         /* This shouldn't make a network call, as the mappings for named pipes are well known */
 103         status = dcerpc_epm_map_binding(binding, binding, table, state->service->task->event_ctx,
 104                                         state->service->task->lp_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                                                         service->task->lp_ctx);
 148
 149         /* Create a credentials structure */
 150         state->domain->libnet_ctx->cred = cli_credentials_init(state->domain);
 151         if (state->domain->libnet_ctx->cred == NULL) goto failed;
 152
 153         cli_credentials_set_conf(state->domain->libnet_ctx->cred, service->task->lp_ctx);
 154
 155         /* Connect the machine account to the credentials */
 156         state->ctx->status =
 157                 cli_credentials_set_machine_account(state->domain->libnet_ctx->cred, state->domain->libnet_ctx->lp_ctx);
 158         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 159
 160         state->domain->netlogon_binding = init_domain_binding(state, &ndr_table_netlogon);
 161
 162         state->domain->netlogon_pipe = NULL;
 163
 164         if ((!cli_credentials_is_anonymous(state->domain->libnet_ctx->cred)) &&
 165             ((lp_server_role(service->task->lp_ctx) == ROLE_DOMAIN_MEMBER) ||
 166              (lp_server_role(service->task->lp_ctx) == ROLE_DOMAIN_CONTROLLER)) &&
 167             (dom_sid_equal(state->domain->info->sid,
 168                            state->service->primary_sid))) {
 169                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL;
 170
 171                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 172                 if (lp_winbind_sealed_pipes(service->task->lp_ctx)) {
 173                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 174                 } else {
 175                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 176                 }
 177         }
 178
 179         /* No encryption on anonymous pipes */
 180
 181         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 182                                          &ndr_table_netlogon,
 183                                          state->domain->libnet_ctx->cred,
 184                                          service->task->event_ctx,
 185                                          service->task->lp_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                 return;
 212         }
 213         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
 214
 215         state->domain->lsa_binding = init_domain_binding(state, &ndr_table_lsarpc);
 216
 217         /* For debugging, it can be a real pain if all the traffic is encrypted */
 218         if (lp_winbind_sealed_pipes(state->service->task->lp_ctx)) {
 219                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 220         } else {
 221                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 222         }
 223
 224         state->domain->libnet_ctx->lsa.pipe = NULL;
 225
 226         /* this will make the secondary connection on the same IPC$ share,
 227            secured with SPNEGO or NTLMSSP */
 228         ctx = dcerpc_secondary_auth_connection_send(state->domain->netlogon_pipe,
 229                                                     state->domain->lsa_binding,
 230                                                     &ndr_table_lsarpc,
 231                                                     state->domain->libnet_ctx->cred,
 232                                                     state->domain->libnet_ctx->lp_ctx
 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                                                             state->domain->libnet_ctx->lp_ctx);
 260                 composite_continue(state->ctx, ctx, continuation, state);
 261                 return true;
 262         } else {
 263                 return false;
 264         }
 265 }
 266 /* We should now have either an authenticated LSA pipe, or an error.
 267  * On success, open a policy handle
 268  */
 269 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 270 {
 271         struct rpc_request *req;
 272         struct init_domain_state *state =
 273                 talloc_get_type(ctx->async.private_data,
 274                                 struct init_domain_state);
 275
 276         state->ctx->status = dcerpc_secondary_auth_connection_recv(ctx, state->domain,
 277                                                                    &state->domain->libnet_ctx->lsa.pipe);
 278         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 279                 if (retry_with_schannel(state, state->domain->lsa_binding,
 280                                         &ndr_table_lsarpc,
 281                                         init_domain_recv_lsa_pipe)) {
 282                         return;
 283                 }
 284         }
 285         if (!composite_is_ok(state->ctx)) return;
 286
 287         talloc_steal(state->domain->libnet_ctx, state->domain->libnet_ctx->lsa.pipe);
 288         talloc_steal(state->domain->libnet_ctx->lsa.pipe, state->domain->lsa_binding);
 289         state->domain->libnet_ctx->lsa.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 290         state->domain->libnet_ctx->lsa.name = state->domain->info->name;
 291
 292         ZERO_STRUCT(state->domain->libnet_ctx->lsa.handle);
 293         state->lsa_openpolicy.in.system_name =
 294                 talloc_asprintf(state, "\\\\%s",
 295                                 dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe));
 296         ZERO_STRUCT(state->objectattr);
 297         state->lsa_openpolicy.in.attr = &state->objectattr;
 298         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 299         state->lsa_openpolicy.out.handle = &state->domain->libnet_ctx->lsa.handle;
 300
 301         req = dcerpc_lsa_OpenPolicy2_send(state->domain->libnet_ctx->lsa.pipe, state,
 302                                           &state->lsa_openpolicy);
 303
 304         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
 305 }
 306
 307 /* Receive a policy handle (or not, and retry the authentication) and
 308  * obtain some basic information about the domain */
 309
 310 static void init_domain_recv_lsa_policy(struct rpc_request *req)
 311 {
 312         struct init_domain_state *state =
 313                 talloc_get_type(req->async.private_data,
 314                                 struct init_domain_state);
 315
 316         state->ctx->status = dcerpc_ndr_request_recv(req);
 317         if ((!NT_STATUS_IS_OK(state->ctx->status)
 318               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 319                 if (retry_with_schannel(state, state->domain->lsa_binding,
 320                                         &ndr_table_lsarpc,
 321                                         init_domain_recv_lsa_pipe)) {
 322                         return;
 323                 }
 324         }
 325         if (!composite_is_ok(state->ctx)) return;
 326         state->ctx->status = state->lsa_openpolicy.out.result;
 327         if (!composite_is_ok(state->ctx)) return;
 328
 329         state->queryinfo.in.handle = &state->domain->libnet_ctx->lsa.handle;
 330         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 331
 332         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->libnet_ctx->lsa.pipe, state,
 333                                               &state->queryinfo);
 334         composite_continue_rpc(state->ctx, req,
 335                                init_domain_recv_queryinfo, state);
 336 }
 337
 338 static void init_domain_recv_queryinfo(struct rpc_request *req)
 339 {
 340         struct init_domain_state *state =
 341                 talloc_get_type(req->async.private_data, struct init_domain_state);
 342         struct lsa_DomainInfo *dominfo;
 343         struct composite_context *ctx;
 344
 345         state->ctx->status = dcerpc_ndr_request_recv(req);
 346         if (!composite_is_ok(state->ctx)) return;
 347         state->ctx->status = state->queryinfo.out.result;
 348         if (!composite_is_ok(state->ctx)) return;
 349
 350         dominfo = &state->queryinfo.out.info->account_domain;
 351
 352         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 353                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 354                           state->domain->info->name,
 355                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 356                           dominfo->name.string));
 357                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 358                 return;
 359         }
 360
 361         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 362                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 363                           dom_sid_string(state, state->domain->info->sid),
 364                           dcerpc_server_name(state->domain->libnet_ctx->lsa.pipe),
 365                           dom_sid_string(state, dominfo->sid)));
 366                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 367                 return;
 368         }
 369
 370         state->domain->samr_binding = init_domain_binding(state, &ndr_table_samr);
 371
 372         /* We want to use the same flags as the LSA pipe did (so, if
 373          * it needed schannel, then we need that here too) */
 374         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 375
 376         state->domain->libnet_ctx->samr.pipe = NULL;
 377
 378         ctx = wb_connect_samr_send(state, state->domain);
 379         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 380 }
 381
 382 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 383  * open an LDAP connection */
 384 static void init_domain_recv_samr(struct composite_context *ctx)
 385 {
 386         const char *ldap_url;
 387         struct init_domain_state *state =
 388                 talloc_get_type(ctx->async.private_data,
 389                                 struct init_domain_state);
 390
 391         state->ctx->status = wb_connect_samr_recv(
 392                 ctx, state->domain,
 393                 &state->domain->libnet_ctx->samr.pipe,
 394                 &state->domain->libnet_ctx->samr.handle,
 395                 &state->domain->libnet_ctx->samr.handle);
 396         if (!composite_is_ok(state->ctx)) return;
 397
 398         talloc_steal(state->domain->libnet_ctx->samr.pipe, state->domain->samr_binding);
 399         state->domain->libnet_ctx->samr.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 400         state->domain->libnet_ctx->samr.name = state->domain->info->name;
 401         state->domain->libnet_ctx->samr.sid = 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 }