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
  42 /*
  43  * Initialize a domain:
  44  *
  45  * - With schannel credentials, try to open the SMB connection and
  46  *   NETLOGON pipe with the machine creds. This works against W2k3SP1
  47  *   with an NTLMSSP session setup. Fall back to anonymous (for the CIFS level).
  48  *
  49  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  50  *   pipe.
  51  *
  52  * - Open LSA. If we have machine creds, try to open with SPNEGO or NTLMSSP. Fall back
  53  *   to schannel.
  54  *
  55  * - With queryinfopolicy, verify that we're talking to the right domain
  56  *
  57  * A bit complex, but with all the combinations I think it's the best we can
  58  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  59  * have a signed&sealed lsa connection on all of them.
  60  *
  61  * Not sure if it is overkill, but it seems to work.
  62  */
  63
  64 struct init_domain_state {
  65         struct composite_context *ctx;
  66         struct wbsrv_domain *domain;
  67         struct wbsrv_service *service;
  68
  69         struct lsa_ObjectAttribute objectattr;
  70         struct lsa_OpenPolicy2 lsa_openpolicy;
  71         struct lsa_QueryInfoPolicy queryinfo;
  72 };
  73
  74 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  75 static void init_domain_recv_lsa_pipe(struct composite_context *ctx);
  76 static void init_domain_recv_lsa_policy(struct rpc_request *req);
  77 static void init_domain_recv_queryinfo(struct rpc_request *req);
  78 static void init_domain_recv_ldapconn(struct composite_context *ctx);
  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 dcerpc_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         if (!NT_STATUS_IS_OK(status)) {
 105                 return NULL;
 106         }
 107
 108         return binding;
 109 }
 110
 111 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
 112                                               struct wbsrv_service *service,
 113                                               struct wb_dom_info *dom_info)
 114 {
 115         struct composite_context *result, *ctx;
 116         struct init_domain_state *state;
 117
 118         result = composite_create(mem_ctx, service->task->event_ctx);
 119         if (result == NULL) goto failed;
 120
 121         state = talloc_zero(result, struct init_domain_state);
 122         if (state == NULL) goto failed;
 123         state->ctx = result;
 124         result->private_data = state;
 125
 126         state->service = service;
 127
 128         state->domain = talloc(state, struct wbsrv_domain);
 129         if (state->domain == NULL) goto failed;
 130
 131         state->domain->info = talloc_reference(state->domain, dom_info);
 132         if (state->domain->info == NULL) goto failed;
 133
 134         /* Caller should check, but to be safe: */
 135         if (dom_info->num_dcs < 1) {
 136                 goto failed;
 137         }
 138
 139         /* For now, we just pick the first.  The next step will be to
 140          * walk the entire list.  Also need to fix finddcs() to return
 141          * the entire list */
 142         state->domain->dc_name = dom_info->dcs[0].name;
 143         state->domain->dc_address = dom_info->dcs[0].address;
 144
 145         /* Create a credentials structure */
 146         state->domain->schannel_creds = cli_credentials_init(state->domain);
 147         if (state->domain->schannel_creds == NULL) goto failed;
 148
 149         cli_credentials_set_event_context(state->domain->schannel_creds, service->task->event_ctx);
 150
 151         cli_credentials_set_conf(state->domain->schannel_creds);
 152
 153         /* Connect the machine account to the credentials */
 154         state->ctx->status =
 155                 cli_credentials_set_machine_account(state->domain->
 156                                                     schannel_creds);
 157         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 158
 159         state->domain->netlogon_binding = init_domain_binding(state, &dcerpc_table_netlogon);
 160
 161         state->domain->netlogon_pipe = NULL;
 162
 163         if ((!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 164             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 165              (dom_sid_equal(state->domain->info->sid,
 166                             state->service->primary_sid)))) {
 167                 state->domain->netlogon_binding->flags |= DCERPC_SCHANNEL;
 168
 169                 /* For debugging, it can be a real pain if all the traffic is encrypted */
 170                 if (lp_winbind_sealed_pipes()) {
 171                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 172                 } else {
 173                         state->domain->netlogon_binding->flags |= (DCERPC_SIGN);
 174                 }
 175         }
 176
 177         /* No encryption on anonymous pipes */
 178
 179         ctx = dcerpc_pipe_connect_b_send(state, state->domain->netlogon_binding,
 180                                          &dcerpc_table_netlogon,
 181                                          state->domain->schannel_creds,
 182                                          service->task->event_ctx);
 183
 184         if (composite_nomem(ctx, state->ctx)) {
 185                 goto failed;
 186         }
 187
 188         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 189                            state);
 190         return result;
 191  failed:
 192         talloc_free(result);
 193         return NULL;
 194 }
 195
 196 /* Having make a netlogon connection (possibly secured with schannel),
 197  * make an LSA connection to the same DC, on the same IPC$ share */
 198 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 199 {
 200         struct init_domain_state *state =
 201                 talloc_get_type(ctx->async.private_data,
 202                                 struct init_domain_state);
 203
 204         state->ctx->status = dcerpc_pipe_connect_b_recv(ctx, state,
 205                                                    &state->domain->netlogon_pipe);
 206
 207         if (!composite_is_ok(state->ctx)) {
 208                 talloc_free(state->domain->netlogon_binding);
 209                 return;
 210         }
 211         talloc_steal(state->domain->netlogon_pipe, state->domain->netlogon_binding);
 212
 213         state->domain->lsa_binding = init_domain_binding(state, &dcerpc_table_lsarpc);
 214
 215         /* For debugging, it can be a real pain if all the traffic is encrypted */
 216         if (lp_winbind_sealed_pipes()) {
 217                 state->domain->lsa_binding->flags |= (DCERPC_SIGN | DCERPC_SEAL );
 218         } else {
 219                 state->domain->lsa_binding->flags |= (DCERPC_SIGN);
 220         }
 221
 222         state->domain->lsa_pipe = NULL;
 223
 224         /* this will make the secondary connection on the same IPC$ share,
 225            secured with SPNEGO or NTLMSSP */
 226         ctx = dcerpc_secondary_connection_send(state->domain->netlogon_pipe,
 227                                                state->domain->lsa_binding);
 228         composite_continue(state->ctx, ctx, init_domain_recv_lsa_pipe, state);
 229 }
 230
 231 static bool retry_with_schannel(struct init_domain_state *state,
 232                                 struct dcerpc_binding *binding,
 233                                 void (*continuation)(struct composite_context *))
 234 {
 235         struct composite_context *ctx;
 236         if (state->domain->netlogon_binding->flags & DCERPC_SCHANNEL
 237             && !(binding->flags & DCERPC_SCHANNEL)) {
 238                 /* Opening a policy handle failed, perhaps it was
 239                  * because we don't get a 'wrong password' error on
 240                  * NTLMSSP binds */
 241
 242                 /* Try again with schannel */
 243                 binding->flags |= DCERPC_SCHANNEL;
 244
 245                 /* Try again, likewise on the same IPC$ share,
 246                    secured with SCHANNEL */
 247                 ctx = dcerpc_secondary_connection_send(state->domain->netlogon_pipe,
 248                                                        binding);
 249                 composite_continue(state->ctx, ctx, continuation, state);
 250                 return true;
 251         } else {
 252                 return false;
 253         }
 254 }
 255 /* We should now have either an authenticated LSA pipe, or an error.
 256  * On success, open a policy handle
 257  */
 258 static void init_domain_recv_lsa_pipe(struct composite_context *ctx)
 259 {
 260         struct rpc_request *req;
 261         struct init_domain_state *state =
 262                 talloc_get_type(ctx->async.private_data,
 263                                 struct init_domain_state);
 264
 265         state->ctx->status = dcerpc_secondary_connection_recv(ctx,
 266                                                               &state->domain->lsa_pipe);
 267         if (NT_STATUS_EQUAL(state->ctx->status, NT_STATUS_LOGON_FAILURE)) {
 268                 if (retry_with_schannel(state, state->domain->lsa_binding,
 269                                         init_domain_recv_lsa_pipe)) {
 270                         return;
 271                 }
 272         }
 273         if (!composite_is_ok(state->ctx)) return;
 274
 275         talloc_steal(state->domain, state->domain->lsa_pipe);
 276         talloc_steal(state->domain->lsa_pipe, state->domain->lsa_binding);
 277
 278         state->domain->lsa_policy_handle = talloc(state, struct policy_handle);
 279         if (composite_nomem(state->domain->lsa_policy_handle, state->ctx)) return;
 280
 281         state->lsa_openpolicy.in.system_name =
 282                 talloc_asprintf(state, "\\\\%s",
 283                                 dcerpc_server_name(state->domain->lsa_pipe));
 284         ZERO_STRUCT(state->objectattr);
 285         state->lsa_openpolicy.in.attr = &state->objectattr;
 286         state->lsa_openpolicy.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 287         state->lsa_openpolicy.out.handle = state->domain->lsa_policy_handle;
 288
 289         req = dcerpc_lsa_OpenPolicy2_send(state->domain->lsa_pipe, state,
 290                                           &state->lsa_openpolicy);
 291
 292         composite_continue_rpc(state->ctx, req, init_domain_recv_lsa_policy, state);
 293 }
 294
 295 /* Receive a policy handle (or not, and retry the authentication) and
 296  * obtain some basic information about the domain */
 297
 298 static void init_domain_recv_lsa_policy(struct rpc_request *req)
 299 {
 300         struct init_domain_state *state =
 301                 talloc_get_type(req->async.private_data,
 302                                 struct init_domain_state);
 303
 304         state->ctx->status = dcerpc_ndr_request_recv(req);
 305         if ((!NT_STATUS_IS_OK(state->ctx->status)
 306               || !NT_STATUS_IS_OK(state->lsa_openpolicy.out.result))) {
 307                 if (retry_with_schannel(state, state->domain->lsa_binding,
 308                                         init_domain_recv_lsa_pipe)) {
 309                         return;
 310                 }
 311         }
 312         if (!composite_is_ok(state->ctx)) return;
 313         state->ctx->status = state->lsa_openpolicy.out.result;
 314         if (!composite_is_ok(state->ctx)) return;
 315
 316         state->queryinfo.in.handle = state->domain->lsa_policy_handle;
 317         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 318
 319         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 320                                               &state->queryinfo);
 321         composite_continue_rpc(state->ctx, req,
 322                                init_domain_recv_queryinfo, state);
 323 }
 324
 325 static void init_domain_recv_queryinfo(struct rpc_request *req)
 326 {
 327         struct init_domain_state *state =
 328                 talloc_get_type(req->async.private_data, struct init_domain_state);
 329         struct lsa_DomainInfo *dominfo;
 330         struct composite_context *ctx;
 331
 332         state->ctx->status = dcerpc_ndr_request_recv(req);
 333         if (!composite_is_ok(state->ctx)) return;
 334         state->ctx->status = state->queryinfo.out.result;
 335         if (!composite_is_ok(state->ctx)) return;
 336
 337         dominfo = &state->queryinfo.out.info->account_domain;
 338
 339         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 340                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 341                           state->domain->info->name,
 342                           dcerpc_server_name(state->domain->lsa_pipe),
 343                           dominfo->name.string));
 344                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 345                 return;
 346         }
 347
 348         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 349                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 350                           dom_sid_string(state, state->domain->info->sid),
 351                           dcerpc_server_name(state->domain->lsa_pipe),
 352                           dom_sid_string(state, dominfo->sid)));
 353                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 354                 return;
 355         }
 356
 357         state->domain->samr_binding = init_domain_binding(state, &dcerpc_table_samr);
 358
 359         /* We want to use the same flags as the LSA pipe did (so, if
 360          * it needed schannel, then we need that here too) */
 361         state->domain->samr_binding->flags = state->domain->lsa_binding->flags;
 362
 363         state->domain->samr_pipe = NULL;
 364
 365         ctx = wb_connect_samr_send(state, state->domain);
 366         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 367 }
 368
 369 /* Recv the SAMR details (SamrConnect and SamrOpenDomain handle) and
 370  * open an LDAP connection */
 371 static void init_domain_recv_samr(struct composite_context *ctx)
 372 {
 373         const char *ldap_url;
 374         struct init_domain_state *state =
 375                 talloc_get_type(ctx->async.private_data,
 376                                 struct init_domain_state);
 377
 378         state->ctx->status = wb_connect_samr_recv(
 379                 ctx, state->domain,
 380                 &state->domain->samr_pipe,
 381                 &state->domain->samr_handle,
 382                 &state->domain->domain_handle);
 383         if (!composite_is_ok(state->ctx)) return;
 384
 385         talloc_steal(state->domain->samr_pipe, state->domain->samr_binding);
 386
 387         state->domain->ldap_conn =
 388                 ldap4_new_connection(state->domain, state->ctx->event_ctx);
 389         composite_nomem(state->domain->ldap_conn, state->ctx);
 390
 391         ldap_url = talloc_asprintf(state, "ldap://%s/",
 392                                    state->domain->dc_address);
 393         composite_nomem(ldap_url, state->ctx);
 394
 395         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 396         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 397 }
 398
 399 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 400 {
 401         struct init_domain_state *state =
 402                 talloc_get_type(ctx->async.private_data,
 403                                 struct init_domain_state);
 404
 405         state->ctx->status = ldap_connect_recv(ctx);
 406         if (NT_STATUS_IS_OK(state->ctx->status)) {
 407                 state->domain->ldap_conn->host =
 408                         talloc_strdup(state->domain->ldap_conn,
 409                                       state->domain->dc_name);
 410                 state->ctx->status =
 411                         ldap_bind_sasl(state->domain->ldap_conn,
 412                                        state->domain->schannel_creds);
 413                 DEBUG(0, ("ldap_bind returned %s\n",
 414                           nt_errstr(state->ctx->status)));
 415         }
 416
 417         composite_done(state->ctx);
 418 }
 419
 420 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 421                              TALLOC_CTX *mem_ctx,
 422                              struct wbsrv_domain **result)
 423 {
 424         NTSTATUS status = composite_wait(c);
 425         if (NT_STATUS_IS_OK(status)) {
 426                 struct init_domain_state *state =
 427                         talloc_get_type(c->private_data,
 428                                         struct init_domain_state);
 429                 *result = talloc_steal(mem_ctx, state->domain);
 430         }
 431         talloc_free(c);
 432         return status;
 433 }
 434
 435 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 436                         struct wb_dom_info *dom_info,
 437                         struct wbsrv_domain **result)
 438 {
 439         struct composite_context *c =
 440                 wb_init_domain_send(mem_ctx, service, dom_info);
 441         return wb_init_domain_recv(c, mem_ctx, result);
 442 }