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 "libcli/composite/composite.h"
  25 #include "libcli/smb_composite/smb_composite.h"
  26 #include "winbind/wb_async_helpers.h"
  27 #include "winbind/wb_server.h"
  28 #include "smbd/service_stream.h"
  29 #include "smbd/service_task.h"
  30 #include "dlinklist.h"
  31
  32 #include "librpc/gen_ndr/nbt.h"
  33 #include "librpc/gen_ndr/samr.h"
  34 #include "lib/messaging/irpc.h"
  35 #include "librpc/gen_ndr/irpc.h"
  36 #include "librpc/gen_ndr/ndr_irpc.h"
  37 #include "libcli/raw/libcliraw.h"
  38 #include "librpc/gen_ndr/ndr_netlogon.h"
  39 #include "librpc/gen_ndr/ndr_lsa.h"
  40 #include "libcli/auth/credentials.h"
  41
  42 #include "libcli/ldap/ldap_client.h"
  43
  44
  45 /*
  46  * Initialize a domain:
  47  *
  48  * - With schannel credentials, try to open the SMB connection with the
  49  *   machine creds. This works against W2k3SP1 with an NTLMSSP session
  50  *   setup. Fall back to anonymous.
  51  *
  52  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  53  *   pipe.
  54  *
  55  * - Open LSA. If we have machine creds, try to open with ntlmssp. Fall back
  56  *   to schannel and then to anon bind.
  57  *
  58  * - With queryinfopolicy, verify that we're talking to the right domain
  59  *
  60  * A bit complex, but with all the combinations I think it's the best we can
  61  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  62  * have a signed&sealed lsa connection on all of them.
  63  *
  64  * Not sure if it is overkill, but it seems to work.
  65  */
  66
  67 struct init_domain_state {
  68         struct composite_context *ctx;
  69         struct wbsrv_domain *domain;
  70         struct wbsrv_service *service;
  71
  72         struct smb_composite_connect conn;
  73
  74         struct lsa_QueryInfoPolicy queryinfo;
  75 };
  76
  77 static void init_domain_recv_tree(struct composite_context *ctx);
  78 static void init_domain_recv_netlogoncreds(struct composite_context *ctx);
  79 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  80 static void init_domain_recv_lsa(struct composite_context *ctx);
  81 static void init_domain_recv_queryinfo(struct rpc_request *req);
  82 static void init_domain_recv_ldapconn(struct composite_context *ctx);
  83 static void init_domain_recv_samr(struct composite_context *ctx);
  84
  85 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
  86                                               struct wbsrv_service *service,
  87                                               struct wb_dom_info *dom_info)
  88 {
  89         struct composite_context *result, *ctx;
  90         struct init_domain_state *state;
  91
  92         result = talloc(mem_ctx, struct composite_context);
  93         if (result == NULL) goto failed;
  94         result->state = COMPOSITE_STATE_IN_PROGRESS;
  95         result->async.fn = NULL;
  96         result->event_ctx = service->task->event_ctx;
  97
  98         state = talloc_zero(result, struct init_domain_state);
  99         if (state == NULL) goto failed;
 100         state->ctx = result;
 101         result->private_data = state;
 102
 103         state->service = service;
 104
 105         state->domain = talloc(state, struct wbsrv_domain);
 106         if (state->domain == NULL) goto failed;
 107
 108         state->domain->info = talloc_reference(state->domain, dom_info);
 109         if (state->domain->info == NULL) goto failed;
 110
 111         state->domain->schannel_creds = cli_credentials_init(state->domain);
 112         if (state->domain->schannel_creds == NULL) goto failed;
 113
 114         cli_credentials_set_conf(state->domain->schannel_creds);
 115         state->ctx->status =
 116                 cli_credentials_set_machine_account(state->domain->
 117                                                     schannel_creds);
 118         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 119
 120         state->conn.in.dest_host = dom_info->dc_address;
 121         state->conn.in.port = 0;
 122         state->conn.in.called_name = dom_info->dc_name;
 123         state->conn.in.service = "IPC$";
 124         state->conn.in.service_type = "IPC";
 125         state->conn.in.workgroup = dom_info->name;
 126         state->conn.in.credentials = state->domain->schannel_creds;
 127
 128         state->conn.in.fallback_to_anonymous = True;
 129
 130         ctx = smb_composite_connect_send(&state->conn, state->domain,
 131                                          result->event_ctx);
 132         if (ctx == NULL) goto failed;
 133
 134         ctx->async.fn = init_domain_recv_tree;
 135         ctx->async.private_data = state;
 136         return result;
 137
 138  failed:
 139         talloc_free(result);
 140         return NULL;
 141 }
 142
 143 static void init_domain_recv_tree(struct composite_context *ctx)
 144 {
 145         struct init_domain_state *state =
 146                 talloc_get_type(ctx->async.private_data,
 147                                 struct init_domain_state);
 148         state->ctx->status = smb_composite_connect_recv(ctx, state);
 149         if (!composite_is_ok(state->ctx)) return;
 150
 151         if ((state->domain->schannel_creds != NULL) &&
 152             (!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 153             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 154              (dom_sid_equal(state->domain->info->sid,
 155                             state->service->primary_sid)))) {
 156                 ctx = wb_get_schannel_creds_send(state,
 157                                                  state->domain->schannel_creds,
 158                                                  state->conn.out.tree,
 159                                                  state->ctx->event_ctx);
 160                 composite_continue(state->ctx, ctx,
 161                                    init_domain_recv_netlogoncreds, state);
 162                 return;
 163         }
 164
 165         ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 166         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 167 }
 168
 169 static void init_domain_recv_netlogoncreds(struct composite_context *ctx)
 170 {
 171         struct init_domain_state *state =
 172                 talloc_get_type(ctx->async.private_data,
 173                                 struct init_domain_state);
 174         struct dcerpc_pipe *auth2_pipe;
 175         struct smbcli_tree *tree = NULL;
 176
 177         state->ctx->status =
 178                 wb_get_schannel_creds_recv(ctx, state, &auth2_pipe);
 179         if (!composite_is_ok(state->ctx)) return;
 180
 181         if (!lp_winbind_sealed_pipes()) {
 182                 state->domain->netlogon_pipe = talloc_reference(state->domain,
 183                                                                 auth2_pipe);
 184                 ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 185                 composite_continue(state->ctx, ctx, init_domain_recv_lsa,
 186                                    state);
 187                 return;
 188         }
 189
 190         state->domain->netlogon_pipe =
 191                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 192         if (composite_nomem(state->domain->netlogon_pipe, state->ctx)) return;
 193
 194         tree = dcerpc_smb_tree(auth2_pipe->conn);
 195         if (tree == NULL) {
 196                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 197                 return;
 198         }
 199
 200         ctx = dcerpc_pipe_open_smb_send(state->domain->netlogon_pipe->conn,
 201                                         tree, "\\netlogon");
 202         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 203                            state);
 204 }
 205
 206 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 207 {
 208         struct init_domain_state *state =
 209                 talloc_get_type(ctx->async.private_data,
 210                                 struct init_domain_state);
 211
 212         state->ctx->status = dcerpc_pipe_open_smb_recv(ctx);
 213         if (!composite_is_ok(state->ctx)) return;
 214
 215         state->domain->netlogon_pipe->conn->flags |=
 216                 (DCERPC_SIGN | DCERPC_SEAL);
 217         state->ctx->status =
 218                 dcerpc_bind_auth(state->domain->netlogon_pipe,
 219                                  DCERPC_NETLOGON_UUID,
 220                                  DCERPC_NETLOGON_VERSION,
 221                                  state->domain->schannel_creds,
 222                                  DCERPC_AUTH_TYPE_SCHANNEL,
 223                                  NULL);
 224         if (!composite_is_ok(state->ctx)) return;
 225
 226         ctx = wb_connect_lsa_send(state, state->conn.out.tree,
 227                                   state->domain->schannel_creds);
 228         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 229 }
 230
 231 static void init_domain_recv_lsa(struct composite_context *ctx)
 232 {
 233         struct init_domain_state *state =
 234                 talloc_get_type(ctx->async.private_data,
 235                                 struct init_domain_state);
 236
 237         struct rpc_request *req;
 238
 239         state->ctx->status = wb_connect_lsa_recv(ctx, state->domain,
 240                                                  &state->domain->lsa_auth_type,
 241                                                  &state->domain->lsa_pipe,
 242                                                  &state->domain->lsa_policy);
 243         if (!composite_is_ok(state->ctx)) return;
 244
 245         /* Give the tree to the pipes. */
 246         talloc_unlink(state, state->conn.out.tree);
 247
 248         state->queryinfo.in.handle = state->domain->lsa_policy;
 249         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 250
 251         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 252                                               &state->queryinfo);
 253         composite_continue_rpc(state->ctx, req,
 254                                init_domain_recv_queryinfo, state);
 255 }
 256
 257 static void init_domain_recv_queryinfo(struct rpc_request *req)
 258 {
 259         struct init_domain_state *state =
 260                 talloc_get_type(req->async.private, struct init_domain_state);
 261         struct lsa_DomainInfo *dominfo;
 262         struct composite_context *ctx;
 263         const char *ldap_url;
 264
 265         state->ctx->status = dcerpc_ndr_request_recv(req);
 266         if (!composite_is_ok(state->ctx)) return;
 267         state->ctx->status = state->queryinfo.out.result;
 268         if (!composite_is_ok(state->ctx)) return;
 269
 270         dominfo = &state->queryinfo.out.info->account_domain;
 271
 272         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 273                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 274                           state->domain->info->name,
 275                           dcerpc_server_name(state->domain->lsa_pipe),
 276                           dominfo->name.string));
 277                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 278                 return;
 279         }
 280
 281         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 282                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 283                           dom_sid_string(state, state->domain->info->sid),
 284                           dcerpc_server_name(state->domain->lsa_pipe),
 285                           dom_sid_string(state, dominfo->sid)));
 286                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 287                 return;
 288         }
 289
 290         state->domain->ldap_conn =
 291                 ldap_new_connection(state->domain, state->ctx->event_ctx);
 292         composite_nomem(state->domain->ldap_conn, state->ctx);
 293
 294         ldap_url = talloc_asprintf(state, "ldap://%s/",
 295                                    state->domain->info->dc_address);
 296         composite_nomem(ldap_url, state->ctx);
 297
 298         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 299         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 300 }
 301
 302 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 303 {
 304         struct init_domain_state *state =
 305                 talloc_get_type(ctx->async.private_data,
 306                                 struct init_domain_state);
 307
 308         state->ctx->status = ldap_connect_recv(ctx);
 309         if (NT_STATUS_IS_OK(state->ctx->status)) {
 310                 state->domain->ldap_conn->host =
 311                         talloc_strdup(state->domain->ldap_conn,
 312                                       state->domain->info->dc_name);
 313                 state->ctx->status =
 314                         ldap_bind_sasl(state->domain->ldap_conn,
 315                                        state->domain->schannel_creds);
 316                 DEBUG(0, ("ldap_bind returned %s\n",
 317                           nt_errstr(state->ctx->status)));
 318         }
 319
 320         state->domain->samr_pipe =
 321                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 322         if (composite_nomem(state->domain->samr_pipe, state->ctx)) return;
 323
 324         ctx = wb_connect_sam_send(state, state->conn.out.tree,
 325                                   state->domain->lsa_auth_type,
 326                                   state->domain->schannel_creds,
 327                                   state->domain->info->sid);
 328         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 329 }
 330
 331 static void init_domain_recv_samr(struct composite_context *ctx)
 332 {
 333         struct init_domain_state *state =
 334                 talloc_get_type(ctx->async.private_data,
 335                                 struct init_domain_state);
 336
 337         state->ctx->status = wb_connect_sam_recv(
 338                 ctx, state->domain, &state->domain->samr_pipe,
 339                 &state->domain->samr_handle, &state->domain->domain_handle);
 340         if (!composite_is_ok(state->ctx)) return;
 341
 342         composite_done(state->ctx);
 343 }
 344
 345 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 346                              TALLOC_CTX *mem_ctx,
 347                              struct wbsrv_domain **result)
 348 {
 349         NTSTATUS status = composite_wait(c);
 350         if (NT_STATUS_IS_OK(status)) {
 351                 struct init_domain_state *state =
 352                         talloc_get_type(c->private_data,
 353                                         struct init_domain_state);
 354                 *result = talloc_steal(mem_ctx, state->domain);
 355         }
 356         talloc_free(c);
 357         return status;
 358 }
 359
 360 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 361                         struct wb_dom_info *dom_info,
 362                         struct wbsrv_domain **result)
 363 {
 364         struct composite_context *c =
 365                 wb_init_domain_send(mem_ctx, service, dom_info);
 366         return wb_init_domain_recv(c, mem_ctx, result);
 367 }