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
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  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
  31 #include "libcli/auth/credentials.h"
  32 #include "libcli/security/proto.h"
  33
  34 #include "libcli/ldap/ldap_client.h"
  35
  36
  37 /*
  38  * Initialize a domain:
  39  *
  40  * - With schannel credentials, try to open the SMB connection with the
  41  *   machine creds. This works against W2k3SP1 with an NTLMSSP session
  42  *   setup. Fall back to anonymous.
  43  *
  44  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  45  *   pipe.
  46  *
  47  * - Open LSA. If we have machine creds, try to open with ntlmssp. Fall back
  48  *   to schannel and then to anon bind.
  49  *
  50  * - With queryinfopolicy, verify that we're talking to the right domain
  51  *
  52  * A bit complex, but with all the combinations I think it's the best we can
  53  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  54  * have a signed&sealed lsa connection on all of them.
  55  *
  56  * Not sure if it is overkill, but it seems to work.
  57  */
  58
  59 struct init_domain_state {
  60         struct composite_context *ctx;
  61         struct wbsrv_domain *domain;
  62         struct wbsrv_service *service;
  63
  64         struct smb_composite_connect conn;
  65
  66         struct lsa_QueryInfoPolicy queryinfo;
  67 };
  68
  69 static void init_domain_recv_tree(struct composite_context *ctx);
  70 static void init_domain_recv_netlogoncreds(struct composite_context *ctx);
  71 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  72 static void init_domain_recv_schannel(struct composite_context *ctx);
  73 static void init_domain_recv_lsa(struct composite_context *ctx);
  74 static void init_domain_recv_queryinfo(struct rpc_request *req);
  75 static void init_domain_recv_ldapconn(struct composite_context *ctx);
  76 static void init_domain_recv_samr(struct composite_context *ctx);
  77
  78 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
  79                                               struct wbsrv_service *service,
  80                                               struct wb_dom_info *dom_info)
  81 {
  82         struct composite_context *result, *ctx;
  83         struct init_domain_state *state;
  84
  85         result = talloc(mem_ctx, struct composite_context);
  86         if (result == NULL) goto failed;
  87         result->state = COMPOSITE_STATE_IN_PROGRESS;
  88         result->async.fn = NULL;
  89         result->event_ctx = service->task->event_ctx;
  90
  91         state = talloc_zero(result, struct init_domain_state);
  92         if (state == NULL) goto failed;
  93         state->ctx = result;
  94         result->private_data = state;
  95
  96         state->service = service;
  97
  98         state->domain = talloc(state, struct wbsrv_domain);
  99         if (state->domain == NULL) goto failed;
 100
 101         state->domain->info = talloc_reference(state->domain, dom_info);
 102         if (state->domain->info == NULL) goto failed;
 103
 104         state->domain->schannel_creds = cli_credentials_init(state->domain);
 105         if (state->domain->schannel_creds == NULL) goto failed;
 106
 107         cli_credentials_set_conf(state->domain->schannel_creds);
 108         state->ctx->status =
 109                 cli_credentials_set_machine_account(state->domain->
 110                                                     schannel_creds);
 111         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 112
 113         state->conn.in.dest_host = dom_info->dc_address;
 114         state->conn.in.port = 0;
 115         state->conn.in.called_name = dom_info->dc_name;
 116         state->conn.in.service = "IPC$";
 117         state->conn.in.service_type = "IPC";
 118         state->conn.in.workgroup = dom_info->name;
 119         state->conn.in.credentials = state->domain->schannel_creds;
 120
 121         state->conn.in.fallback_to_anonymous = True;
 122
 123         ctx = smb_composite_connect_send(&state->conn, state->domain,
 124                                          result->event_ctx);
 125         if (ctx == NULL) goto failed;
 126
 127         ctx->async.fn = init_domain_recv_tree;
 128         ctx->async.private_data = state;
 129         return result;
 130
 131  failed:
 132         talloc_free(result);
 133         return NULL;
 134 }
 135
 136 static void init_domain_recv_tree(struct composite_context *ctx)
 137 {
 138         struct init_domain_state *state =
 139                 talloc_get_type(ctx->async.private_data,
 140                                 struct init_domain_state);
 141         state->ctx->status = smb_composite_connect_recv(ctx, state);
 142         if (!composite_is_ok(state->ctx)) return;
 143
 144         if ((state->domain->schannel_creds != NULL) &&
 145             (!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 146             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 147              (dom_sid_equal(state->domain->info->sid,
 148                             state->service->primary_sid)))) {
 149                 ctx = wb_get_schannel_creds_send(state,
 150                                                  state->domain->schannel_creds,
 151                                                  state->conn.out.tree,
 152                                                  state->ctx->event_ctx);
 153                 composite_continue(state->ctx, ctx,
 154                                    init_domain_recv_netlogoncreds, state);
 155                 return;
 156         }
 157
 158         ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 159         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 160 }
 161
 162 static void init_domain_recv_netlogoncreds(struct composite_context *ctx)
 163 {
 164         struct init_domain_state *state =
 165                 talloc_get_type(ctx->async.private_data,
 166                                 struct init_domain_state);
 167         struct dcerpc_pipe *auth2_pipe;
 168         struct smbcli_tree *tree = NULL;
 169
 170         state->ctx->status =
 171                 wb_get_schannel_creds_recv(ctx, state, &auth2_pipe);
 172         if (!composite_is_ok(state->ctx)) return;
 173
 174         if (!lp_winbind_sealed_pipes()) {
 175                 state->domain->netlogon_pipe = talloc_reference(state->domain,
 176                                                                 auth2_pipe);
 177                 ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 178                 composite_continue(state->ctx, ctx, init_domain_recv_lsa,
 179                                    state);
 180                 return;
 181         }
 182
 183         state->domain->netlogon_pipe =
 184                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 185         if (composite_nomem(state->domain->netlogon_pipe, state->ctx)) return;
 186
 187         tree = dcerpc_smb_tree(auth2_pipe->conn);
 188         if (tree == NULL) {
 189                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 190                 return;
 191         }
 192
 193         ctx = dcerpc_pipe_open_smb_send(state->domain->netlogon_pipe->conn,
 194                                         tree, "\\netlogon");
 195         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 196                            state);
 197 }
 198
 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_open_smb_recv(ctx);
 206         if (!composite_is_ok(state->ctx)) return;
 207
 208         state->domain->netlogon_pipe->conn->flags |=
 209                 (DCERPC_SIGN | DCERPC_SEAL);
 210         ctx = dcerpc_bind_auth_send(state, state->domain->netlogon_pipe,
 211                                     &dcerpc_table_netlogon,
 212                                     state->domain->schannel_creds,
 213                                     DCERPC_AUTH_TYPE_SCHANNEL,
 214                                     DCERPC_AUTH_LEVEL_PRIVACY,
 215                                     NULL);
 216         composite_continue(state->ctx, ctx, init_domain_recv_schannel, state);
 217 }
 218
 219 static void init_domain_recv_schannel(struct composite_context *ctx)
 220 {
 221         struct init_domain_state *state =
 222                 talloc_get_type(ctx->async.private_data,
 223                                 struct init_domain_state);
 224
 225         state->ctx->status = dcerpc_bind_auth_recv(ctx);
 226         if (!composite_is_ok(state->ctx)) return;
 227
 228         ctx = wb_connect_lsa_send(state, state->conn.out.tree,
 229                                   state->domain->schannel_creds);
 230         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 231 }
 232
 233 static void init_domain_recv_lsa(struct composite_context *ctx)
 234 {
 235         struct init_domain_state *state =
 236                 talloc_get_type(ctx->async.private_data,
 237                                 struct init_domain_state);
 238
 239         struct rpc_request *req;
 240
 241         state->ctx->status = wb_connect_lsa_recv(ctx, state->domain,
 242                                                  &state->domain->lsa_auth_type,
 243                                                  &state->domain->lsa_pipe,
 244                                                  &state->domain->lsa_policy);
 245         if (!composite_is_ok(state->ctx)) return;
 246
 247         /* Give the tree to the pipes. */
 248         talloc_unlink(state, state->conn.out.tree);
 249
 250         state->queryinfo.in.handle = state->domain->lsa_policy;
 251         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 252
 253         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 254                                               &state->queryinfo);
 255         composite_continue_rpc(state->ctx, req,
 256                                init_domain_recv_queryinfo, state);
 257 }
 258
 259 static void init_domain_recv_queryinfo(struct rpc_request *req)
 260 {
 261         struct init_domain_state *state =
 262                 talloc_get_type(req->async.private, struct init_domain_state);
 263         struct lsa_DomainInfo *dominfo;
 264         struct composite_context *ctx;
 265         const char *ldap_url;
 266
 267         state->ctx->status = dcerpc_ndr_request_recv(req);
 268         if (!composite_is_ok(state->ctx)) return;
 269         state->ctx->status = state->queryinfo.out.result;
 270         if (!composite_is_ok(state->ctx)) return;
 271
 272         dominfo = &state->queryinfo.out.info->account_domain;
 273
 274         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 275                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 276                           state->domain->info->name,
 277                           dcerpc_server_name(state->domain->lsa_pipe),
 278                           dominfo->name.string));
 279                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 280                 return;
 281         }
 282
 283         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 284                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 285                           dom_sid_string(state, state->domain->info->sid),
 286                           dcerpc_server_name(state->domain->lsa_pipe),
 287                           dom_sid_string(state, dominfo->sid)));
 288                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 289                 return;
 290         }
 291
 292         state->domain->ldap_conn =
 293                 ldap_new_connection(state->domain, state->ctx->event_ctx);
 294         composite_nomem(state->domain->ldap_conn, state->ctx);
 295
 296         ldap_url = talloc_asprintf(state, "ldap://%s/",
 297                                    state->domain->info->dc_address);
 298         composite_nomem(ldap_url, state->ctx);
 299
 300         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 301         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 302 }
 303
 304 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 305 {
 306         struct init_domain_state *state =
 307                 talloc_get_type(ctx->async.private_data,
 308                                 struct init_domain_state);
 309
 310         state->ctx->status = ldap_connect_recv(ctx);
 311         if (NT_STATUS_IS_OK(state->ctx->status)) {
 312                 state->domain->ldap_conn->host =
 313                         talloc_strdup(state->domain->ldap_conn,
 314                                       state->domain->info->dc_name);
 315                 state->ctx->status =
 316                         ldap_bind_sasl(state->domain->ldap_conn,
 317                                        state->domain->schannel_creds);
 318                 DEBUG(0, ("ldap_bind returned %s\n",
 319                           nt_errstr(state->ctx->status)));
 320         }
 321
 322         state->domain->samr_pipe =
 323                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 324         if (composite_nomem(state->domain->samr_pipe, state->ctx)) return;
 325
 326         ctx = wb_connect_sam_send(state, state->conn.out.tree,
 327                                   state->domain->lsa_auth_type,
 328                                   state->domain->schannel_creds,
 329                                   state->domain->info->sid);
 330         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 331 }
 332
 333 static void init_domain_recv_samr(struct composite_context *ctx)
 334 {
 335         struct init_domain_state *state =
 336                 talloc_get_type(ctx->async.private_data,
 337                                 struct init_domain_state);
 338
 339         state->ctx->status = wb_connect_sam_recv(
 340                 ctx, state->domain, &state->domain->samr_pipe,
 341                 &state->domain->samr_handle, &state->domain->domain_handle);
 342         if (!composite_is_ok(state->ctx)) return;
 343
 344         composite_done(state->ctx);
 345 }
 346
 347 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 348                              TALLOC_CTX *mem_ctx,
 349                              struct wbsrv_domain **result)
 350 {
 351         NTSTATUS status = composite_wait(c);
 352         if (NT_STATUS_IS_OK(status)) {
 353                 struct init_domain_state *state =
 354                         talloc_get_type(c->private_data,
 355                                         struct init_domain_state);
 356                 *result = talloc_steal(mem_ctx, state->domain);
 357         }
 358         talloc_free(c);
 359         return status;
 360 }
 361
 362 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 363                         struct wb_dom_info *dom_info,
 364                         struct wbsrv_domain **result)
 365 {
 366         struct composite_context *c =
 367                 wb_init_domain_send(mem_ctx, service, dom_info);
 368         return wb_init_domain_recv(c, mem_ctx, result);
 369 }