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 "smb.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
  34 #include "libcli/auth/credentials.h"
  35 #include "libcli/security/security.h"
  36
  37 #include "libcli/ldap/ldap_client.h"
  38
  39 #include "auth/credentials/credentials.h"
  40
  41 /*
  42  * Initialize a domain:
  43  *
  44  * - With schannel credentials, try to open the SMB connection with the
  45  *   machine creds. This works against W2k3SP1 with an NTLMSSP session
  46  *   setup. Fall back to anonymous.
  47  *
  48  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  49  *   pipe.
  50  *
  51  * - Open LSA. If we have machine creds, try to open with ntlmssp. Fall back
  52  *   to schannel and then to anon bind.
  53  *
  54  * - With queryinfopolicy, verify that we're talking to the right domain
  55  *
  56  * A bit complex, but with all the combinations I think it's the best we can
  57  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  58  * have a signed&sealed lsa connection on all of them.
  59  *
  60  * Not sure if it is overkill, but it seems to work.
  61  */
  62
  63 struct init_domain_state {
  64         struct composite_context *ctx;
  65         struct wbsrv_domain *domain;
  66         struct wbsrv_service *service;
  67
  68         struct smb_composite_connect conn;
  69
  70         struct lsa_QueryInfoPolicy queryinfo;
  71 };
  72
  73 static void init_domain_recv_tree(struct composite_context *ctx);
  74 static void init_domain_recv_netlogoncreds(struct composite_context *ctx);
  75 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  76 static void init_domain_recv_schannel(struct composite_context *ctx);
  77 static void init_domain_recv_lsa(struct composite_context *ctx);
  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 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
  83                                               struct wbsrv_service *service,
  84                                               struct wb_dom_info *dom_info)
  85 {
  86         struct composite_context *result, *ctx;
  87         struct init_domain_state *state;
  88
  89         result = talloc(mem_ctx, struct composite_context);
  90         if (result == NULL) goto failed;
  91         result->state = COMPOSITE_STATE_IN_PROGRESS;
  92         result->async.fn = NULL;
  93         result->event_ctx = service->task->event_ctx;
  94
  95         state = talloc_zero(result, struct init_domain_state);
  96         if (state == NULL) goto failed;
  97         state->ctx = result;
  98         result->private_data = state;
  99
 100         state->service = service;
 101
 102         state->domain = talloc(state, struct wbsrv_domain);
 103         if (state->domain == NULL) goto failed;
 104
 105         state->domain->info = talloc_reference(state->domain, dom_info);
 106         if (state->domain->info == NULL) goto failed;
 107
 108         state->domain->schannel_creds = cli_credentials_init(state->domain);
 109         if (state->domain->schannel_creds == NULL) goto failed;
 110
 111         cli_credentials_set_conf(state->domain->schannel_creds);
 112         state->ctx->status =
 113                 cli_credentials_set_machine_account(state->domain->
 114                                                     schannel_creds);
 115         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 116
 117         state->conn.in.dest_host = dom_info->dc_address;
 118         state->conn.in.port = 0;
 119         state->conn.in.called_name = dom_info->dc_name;
 120         state->conn.in.service = "IPC$";
 121         state->conn.in.service_type = "IPC";
 122         state->conn.in.workgroup = dom_info->name;
 123         state->conn.in.credentials = state->domain->schannel_creds;
 124
 125         state->conn.in.fallback_to_anonymous = True;
 126
 127         ctx = smb_composite_connect_send(&state->conn, state->domain,
 128                                          result->event_ctx);
 129         if (ctx == NULL) goto failed;
 130
 131         ctx->async.fn = init_domain_recv_tree;
 132         ctx->async.private_data = state;
 133         return result;
 134
 135  failed:
 136         talloc_free(result);
 137         return NULL;
 138 }
 139
 140 static void init_domain_recv_tree(struct composite_context *ctx)
 141 {
 142         struct init_domain_state *state =
 143                 talloc_get_type(ctx->async.private_data,
 144                                 struct init_domain_state);
 145         state->ctx->status = smb_composite_connect_recv(ctx, state);
 146         if (!composite_is_ok(state->ctx)) return;
 147
 148         if ((state->domain->schannel_creds != NULL) &&
 149             (!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 150             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 151              (dom_sid_equal(state->domain->info->sid,
 152                             state->service->primary_sid)))) {
 153                 ctx = wb_get_schannel_creds_send(state,
 154                                                  state->domain->schannel_creds,
 155                                                  state->conn.out.tree,
 156                                                  state->ctx->event_ctx);
 157                 composite_continue(state->ctx, ctx,
 158                                    init_domain_recv_netlogoncreds, state);
 159                 return;
 160         }
 161
 162         ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 163         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 164 }
 165
 166 static void init_domain_recv_netlogoncreds(struct composite_context *ctx)
 167 {
 168         struct init_domain_state *state =
 169                 talloc_get_type(ctx->async.private_data,
 170                                 struct init_domain_state);
 171         struct dcerpc_pipe *auth2_pipe;
 172         struct smbcli_tree *tree = NULL;
 173
 174         state->ctx->status =
 175                 wb_get_schannel_creds_recv(ctx, state, &auth2_pipe);
 176         if (!composite_is_ok(state->ctx)) return;
 177
 178         if (!lp_winbind_sealed_pipes()) {
 179                 state->domain->netlogon_pipe = talloc_reference(state->domain,
 180                                                                 auth2_pipe);
 181                 ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 182                 composite_continue(state->ctx, ctx, init_domain_recv_lsa,
 183                                    state);
 184                 return;
 185         }
 186
 187         state->domain->netlogon_pipe =
 188                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 189         if (composite_nomem(state->domain->netlogon_pipe, state->ctx)) return;
 190
 191         tree = dcerpc_smb_tree(auth2_pipe->conn);
 192         if (tree == NULL) {
 193                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 194                 return;
 195         }
 196
 197         ctx = dcerpc_pipe_open_smb_send(state->domain->netlogon_pipe->conn,
 198                                         tree, "\\netlogon");
 199         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 200                            state);
 201 }
 202
 203 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 204 {
 205         struct init_domain_state *state =
 206                 talloc_get_type(ctx->async.private_data,
 207                                 struct init_domain_state);
 208
 209         state->ctx->status = dcerpc_pipe_open_smb_recv(ctx);
 210         if (!composite_is_ok(state->ctx)) return;
 211
 212         state->domain->netlogon_pipe->conn->flags |=
 213                 (DCERPC_SIGN | DCERPC_SEAL);
 214         ctx = dcerpc_bind_auth_send(state, state->domain->netlogon_pipe,
 215                                     &dcerpc_table_netlogon,
 216                                     state->domain->schannel_creds,
 217                                     DCERPC_AUTH_TYPE_SCHANNEL,
 218                                     DCERPC_AUTH_LEVEL_PRIVACY,
 219                                     NULL);
 220         composite_continue(state->ctx, ctx, init_domain_recv_schannel, state);
 221 }
 222
 223 static void init_domain_recv_schannel(struct composite_context *ctx)
 224 {
 225         struct init_domain_state *state =
 226                 talloc_get_type(ctx->async.private_data,
 227                                 struct init_domain_state);
 228
 229         state->ctx->status = dcerpc_bind_auth_recv(ctx);
 230         if (!composite_is_ok(state->ctx)) return;
 231
 232         ctx = wb_connect_lsa_send(state, state->conn.out.tree,
 233                                   state->domain->schannel_creds);
 234         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 235 }
 236
 237 static void init_domain_recv_lsa(struct composite_context *ctx)
 238 {
 239         struct init_domain_state *state =
 240                 talloc_get_type(ctx->async.private_data,
 241                                 struct init_domain_state);
 242
 243         struct rpc_request *req;
 244
 245         state->ctx->status = wb_connect_lsa_recv(ctx, state->domain,
 246                                                  &state->domain->lsa_auth_type,
 247                                                  &state->domain->lsa_pipe,
 248                                                  &state->domain->lsa_policy);
 249         if (!composite_is_ok(state->ctx)) return;
 250
 251         /* Give the tree to the pipes. */
 252         talloc_unlink(state, state->conn.out.tree);
 253
 254         state->queryinfo.in.handle = state->domain->lsa_policy;
 255         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 256
 257         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 258                                               &state->queryinfo);
 259         composite_continue_rpc(state->ctx, req,
 260                                init_domain_recv_queryinfo, state);
 261 }
 262
 263 static void init_domain_recv_queryinfo(struct rpc_request *req)
 264 {
 265         struct init_domain_state *state =
 266                 talloc_get_type(req->async.private, struct init_domain_state);
 267         struct lsa_DomainInfo *dominfo;
 268         struct composite_context *ctx;
 269         const char *ldap_url;
 270
 271         state->ctx->status = dcerpc_ndr_request_recv(req);
 272         if (!composite_is_ok(state->ctx)) return;
 273         state->ctx->status = state->queryinfo.out.result;
 274         if (!composite_is_ok(state->ctx)) return;
 275
 276         dominfo = &state->queryinfo.out.info->account_domain;
 277
 278         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 279                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 280                           state->domain->info->name,
 281                           dcerpc_server_name(state->domain->lsa_pipe),
 282                           dominfo->name.string));
 283                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 284                 return;
 285         }
 286
 287         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 288                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 289                           dom_sid_string(state, state->domain->info->sid),
 290                           dcerpc_server_name(state->domain->lsa_pipe),
 291                           dom_sid_string(state, dominfo->sid)));
 292                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 293                 return;
 294         }
 295
 296         state->domain->ldap_conn =
 297                 ldap_new_connection(state->domain, state->ctx->event_ctx);
 298         composite_nomem(state->domain->ldap_conn, state->ctx);
 299
 300         ldap_url = talloc_asprintf(state, "ldap://%s/",
 301                                    state->domain->info->dc_address);
 302         composite_nomem(ldap_url, state->ctx);
 303
 304         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 305         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 306 }
 307
 308 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 309 {
 310         struct init_domain_state *state =
 311                 talloc_get_type(ctx->async.private_data,
 312                                 struct init_domain_state);
 313
 314         state->ctx->status = ldap_connect_recv(ctx);
 315         if (NT_STATUS_IS_OK(state->ctx->status)) {
 316                 state->domain->ldap_conn->host =
 317                         talloc_strdup(state->domain->ldap_conn,
 318                                       state->domain->info->dc_name);
 319                 state->ctx->status =
 320                         ldap_bind_sasl(state->domain->ldap_conn,
 321                                        state->domain->schannel_creds);
 322                 DEBUG(0, ("ldap_bind returned %s\n",
 323                           nt_errstr(state->ctx->status)));
 324         }
 325
 326         state->domain->samr_pipe =
 327                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 328         if (composite_nomem(state->domain->samr_pipe, state->ctx)) return;
 329
 330         ctx = wb_connect_sam_send(state, state->conn.out.tree,
 331                                   state->domain->lsa_auth_type,
 332                                   state->domain->schannel_creds,
 333                                   state->domain->info->sid);
 334         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 335 }
 336
 337 static void init_domain_recv_samr(struct composite_context *ctx)
 338 {
 339         struct init_domain_state *state =
 340                 talloc_get_type(ctx->async.private_data,
 341                                 struct init_domain_state);
 342
 343         state->ctx->status = wb_connect_sam_recv(
 344                 ctx, state->domain, &state->domain->samr_pipe,
 345                 &state->domain->samr_handle, &state->domain->domain_handle);
 346         if (!composite_is_ok(state->ctx)) return;
 347
 348         composite_done(state->ctx);
 349 }
 350
 351 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 352                              TALLOC_CTX *mem_ctx,
 353                              struct wbsrv_domain **result)
 354 {
 355         NTSTATUS status = composite_wait(c);
 356         if (NT_STATUS_IS_OK(status)) {
 357                 struct init_domain_state *state =
 358                         talloc_get_type(c->private_data,
 359                                         struct init_domain_state);
 360                 *result = talloc_steal(mem_ctx, state->domain);
 361         }
 362         talloc_free(c);
 363         return status;
 364 }
 365
 366 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 367                         struct wb_dom_info *dom_info,
 368                         struct wbsrv_domain **result)
 369 {
 370         struct composite_context *c =
 371                 wb_init_domain_send(mem_ctx, service, dom_info);
 372         return wb_init_domain_recv(c, mem_ctx, result);
 373 }