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
   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 #include "librpc/gen_ndr/ndr_security.h"
  34
  35 #include "libcli/auth/credentials.h"
  36 #include "libcli/security/proto.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 with the
  46  *   machine creds. This works against W2k3SP1 with an NTLMSSP session
  47  *   setup. Fall back to anonymous.
  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 ntlmssp. Fall back
  53  *   to schannel and then to anon bind.
  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 smb_composite_connect conn;
  70
  71         struct lsa_QueryInfoPolicy queryinfo;
  72 };
  73
  74 static void init_domain_recv_tree(struct composite_context *ctx);
  75 static void init_domain_recv_netlogoncreds(struct composite_context *ctx);
  76 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  77 static void init_domain_recv_schannel(struct composite_context *ctx);
  78 static void init_domain_recv_lsa(struct composite_context *ctx);
  79 static void init_domain_recv_queryinfo(struct rpc_request *req);
  80 static void init_domain_recv_ldapconn(struct composite_context *ctx);
  81 static void init_domain_recv_samr(struct composite_context *ctx);
  82
  83 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
  84                                               struct wbsrv_service *service,
  85                                               struct wb_dom_info *dom_info)
  86 {
  87         struct composite_context *result, *ctx;
  88         struct init_domain_state *state;
  89
  90         result = talloc(mem_ctx, struct composite_context);
  91         if (result == NULL) goto failed;
  92         result->state = COMPOSITE_STATE_IN_PROGRESS;
  93         result->async.fn = NULL;
  94         result->event_ctx = service->task->event_ctx;
  95
  96         state = talloc_zero(result, struct init_domain_state);
  97         if (state == NULL) goto failed;
  98         state->ctx = result;
  99         result->private_data = state;
 100
 101         state->service = service;
 102
 103         state->domain = talloc(state, struct wbsrv_domain);
 104         if (state->domain == NULL) goto failed;
 105
 106         state->domain->info = talloc_reference(state->domain, dom_info);
 107         if (state->domain->info == NULL) goto failed;
 108
 109         state->domain->schannel_creds = cli_credentials_init(state->domain);
 110         if (state->domain->schannel_creds == NULL) goto failed;
 111
 112         cli_credentials_set_conf(state->domain->schannel_creds);
 113         state->ctx->status =
 114                 cli_credentials_set_machine_account(state->domain->
 115                                                     schannel_creds);
 116         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 117
 118         state->conn.in.dest_host = dom_info->dc_address;
 119         state->conn.in.port = 0;
 120         state->conn.in.called_name = dom_info->dc_name;
 121         state->conn.in.service = "IPC$";
 122         state->conn.in.service_type = "IPC";
 123         state->conn.in.workgroup = dom_info->name;
 124         state->conn.in.credentials = state->domain->schannel_creds;
 125
 126         state->conn.in.fallback_to_anonymous = True;
 127
 128         ctx = smb_composite_connect_send(&state->conn, state->domain,
 129                                          result->event_ctx);
 130         if (ctx == NULL) goto failed;
 131
 132         ctx->async.fn = init_domain_recv_tree;
 133         ctx->async.private_data = state;
 134         return result;
 135
 136  failed:
 137         talloc_free(result);
 138         return NULL;
 139 }
 140
 141 static void init_domain_recv_tree(struct composite_context *ctx)
 142 {
 143         struct init_domain_state *state =
 144                 talloc_get_type(ctx->async.private_data,
 145                                 struct init_domain_state);
 146         state->ctx->status = smb_composite_connect_recv(ctx, state);
 147         if (!composite_is_ok(state->ctx)) return;
 148
 149         if ((state->domain->schannel_creds != NULL) &&
 150             (!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 151             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 152              (dom_sid_equal(state->domain->info->sid,
 153                             state->service->primary_sid)))) {
 154                 ctx = wb_get_schannel_creds_send(state,
 155                                                  state->domain->schannel_creds,
 156                                                  state->conn.out.tree,
 157                                                  state->ctx->event_ctx);
 158                 composite_continue(state->ctx, ctx,
 159                                    init_domain_recv_netlogoncreds, state);
 160                 return;
 161         }
 162
 163         ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 164         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 165 }
 166
 167 static void init_domain_recv_netlogoncreds(struct composite_context *ctx)
 168 {
 169         struct init_domain_state *state =
 170                 talloc_get_type(ctx->async.private_data,
 171                                 struct init_domain_state);
 172         struct dcerpc_pipe *auth2_pipe;
 173         struct smbcli_tree *tree = NULL;
 174
 175         state->ctx->status =
 176                 wb_get_schannel_creds_recv(ctx, state, &auth2_pipe);
 177         if (!composite_is_ok(state->ctx)) return;
 178
 179         if (!lp_winbind_sealed_pipes()) {
 180                 state->domain->netlogon_pipe = talloc_reference(state->domain,
 181                                                                 auth2_pipe);
 182                 ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 183                 composite_continue(state->ctx, ctx, init_domain_recv_lsa,
 184                                    state);
 185                 return;
 186         }
 187
 188         state->domain->netlogon_pipe =
 189                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 190         if (composite_nomem(state->domain->netlogon_pipe, state->ctx)) return;
 191
 192         tree = dcerpc_smb_tree(auth2_pipe->conn);
 193         if (tree == NULL) {
 194                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 195                 return;
 196         }
 197
 198         ctx = dcerpc_pipe_open_smb_send(state->domain->netlogon_pipe->conn,
 199                                         tree, "\\netlogon");
 200         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 201                            state);
 202 }
 203
 204 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 205 {
 206         struct init_domain_state *state =
 207                 talloc_get_type(ctx->async.private_data,
 208                                 struct init_domain_state);
 209
 210         state->ctx->status = dcerpc_pipe_open_smb_recv(ctx);
 211         if (!composite_is_ok(state->ctx)) return;
 212
 213         state->domain->netlogon_pipe->conn->flags |=
 214                 (DCERPC_SIGN | DCERPC_SEAL);
 215         ctx = dcerpc_bind_auth_send(state, state->domain->netlogon_pipe,
 216                                     &dcerpc_table_netlogon,
 217                                     state->domain->schannel_creds,
 218                                     DCERPC_AUTH_TYPE_SCHANNEL,
 219                                     DCERPC_AUTH_LEVEL_PRIVACY,
 220                                     NULL);
 221         composite_continue(state->ctx, ctx, init_domain_recv_schannel, state);
 222 }
 223
 224 static void init_domain_recv_schannel(struct composite_context *ctx)
 225 {
 226         struct init_domain_state *state =
 227                 talloc_get_type(ctx->async.private_data,
 228                                 struct init_domain_state);
 229
 230         state->ctx->status = dcerpc_bind_auth_recv(ctx);
 231         if (!composite_is_ok(state->ctx)) return;
 232
 233         ctx = wb_connect_lsa_send(state, state->conn.out.tree,
 234                                   state->domain->schannel_creds);
 235         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 236 }
 237
 238 static void init_domain_recv_lsa(struct composite_context *ctx)
 239 {
 240         struct init_domain_state *state =
 241                 talloc_get_type(ctx->async.private_data,
 242                                 struct init_domain_state);
 243
 244         struct rpc_request *req;
 245
 246         state->ctx->status = wb_connect_lsa_recv(ctx, state->domain,
 247                                                  &state->domain->lsa_auth_type,
 248                                                  &state->domain->lsa_pipe,
 249                                                  &state->domain->lsa_policy);
 250         if (!composite_is_ok(state->ctx)) return;
 251
 252         /* Give the tree to the pipes. */
 253         talloc_unlink(state, state->conn.out.tree);
 254
 255         state->queryinfo.in.handle = state->domain->lsa_policy;
 256         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 257
 258         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 259                                               &state->queryinfo);
 260         composite_continue_rpc(state->ctx, req,
 261                                init_domain_recv_queryinfo, state);
 262 }
 263
 264 static void init_domain_recv_queryinfo(struct rpc_request *req)
 265 {
 266         struct init_domain_state *state =
 267                 talloc_get_type(req->async.private, struct init_domain_state);
 268         struct lsa_DomainInfo *dominfo;
 269         struct composite_context *ctx;
 270         const char *ldap_url;
 271
 272         state->ctx->status = dcerpc_ndr_request_recv(req);
 273         if (!composite_is_ok(state->ctx)) return;
 274         state->ctx->status = state->queryinfo.out.result;
 275         if (!composite_is_ok(state->ctx)) return;
 276
 277         dominfo = &state->queryinfo.out.info->account_domain;
 278
 279         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 280                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 281                           state->domain->info->name,
 282                           dcerpc_server_name(state->domain->lsa_pipe),
 283                           dominfo->name.string));
 284                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 285                 return;
 286         }
 287
 288         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 289                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 290                           dom_sid_string(state, state->domain->info->sid),
 291                           dcerpc_server_name(state->domain->lsa_pipe),
 292                           dom_sid_string(state, dominfo->sid)));
 293                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 294                 return;
 295         }
 296
 297         state->domain->ldap_conn =
 298                 ldap_new_connection(state->domain, state->ctx->event_ctx);
 299         composite_nomem(state->domain->ldap_conn, state->ctx);
 300
 301         ldap_url = talloc_asprintf(state, "ldap://%s/",
 302                                    state->domain->info->dc_address);
 303         composite_nomem(ldap_url, state->ctx);
 304
 305         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 306         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 307 }
 308
 309 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 310 {
 311         struct init_domain_state *state =
 312                 talloc_get_type(ctx->async.private_data,
 313                                 struct init_domain_state);
 314
 315         state->ctx->status = ldap_connect_recv(ctx);
 316         if (NT_STATUS_IS_OK(state->ctx->status)) {
 317                 state->domain->ldap_conn->host =
 318                         talloc_strdup(state->domain->ldap_conn,
 319                                       state->domain->info->dc_name);
 320                 state->ctx->status =
 321                         ldap_bind_sasl(state->domain->ldap_conn,
 322                                        state->domain->schannel_creds);
 323                 DEBUG(0, ("ldap_bind returned %s\n",
 324                           nt_errstr(state->ctx->status)));
 325         }
 326
 327         state->domain->samr_pipe =
 328                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 329         if (composite_nomem(state->domain->samr_pipe, state->ctx)) return;
 330
 331         ctx = wb_connect_sam_send(state, state->conn.out.tree,
 332                                   state->domain->lsa_auth_type,
 333                                   state->domain->schannel_creds,
 334                                   state->domain->info->sid);
 335         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 336 }
 337
 338 static void init_domain_recv_samr(struct composite_context *ctx)
 339 {
 340         struct init_domain_state *state =
 341                 talloc_get_type(ctx->async.private_data,
 342                                 struct init_domain_state);
 343
 344         state->ctx->status = wb_connect_sam_recv(
 345                 ctx, state->domain, &state->domain->samr_pipe,
 346                 &state->domain->samr_handle, &state->domain->domain_handle);
 347         if (!composite_is_ok(state->ctx)) return;
 348
 349         composite_done(state->ctx);
 350 }
 351
 352 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 353                              TALLOC_CTX *mem_ctx,
 354                              struct wbsrv_domain **result)
 355 {
 356         NTSTATUS status = composite_wait(c);
 357         if (NT_STATUS_IS_OK(status)) {
 358                 struct init_domain_state *state =
 359                         talloc_get_type(c->private_data,
 360                                         struct init_domain_state);
 361                 *result = talloc_steal(mem_ctx, state->domain);
 362         }
 363         talloc_free(c);
 364         return status;
 365 }
 366
 367 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 368                         struct wb_dom_info *dom_info,
 369                         struct wbsrv_domain **result)
 370 {
 371         struct composite_context *c =
 372                 wb_init_domain_send(mem_ctx, service, dom_info);
 373         return wb_init_domain_recv(c, mem_ctx, result);
 374 }