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_lsa_c.h"
  32
  33 #include "libcli/auth/credentials.h"
  34 #include "libcli/security/proto.h"
  35
  36 #include "libcli/ldap/ldap_client.h"
  37
  38 #include "auth/credentials/credentials.h"
  39
  40 /*
  41  * Initialize a domain:
  42  *
  43  * - With schannel credentials, try to open the SMB connection with the
  44  *   machine creds. This works against W2k3SP1 with an NTLMSSP session
  45  *   setup. Fall back to anonymous.
  46  *
  47  * - If we have schannel creds, do the auth2 and open the schannel'ed netlogon
  48  *   pipe.
  49  *
  50  * - Open LSA. If we have machine creds, try to open with ntlmssp. Fall back
  51  *   to schannel and then to anon bind.
  52  *
  53  * - With queryinfopolicy, verify that we're talking to the right domain
  54  *
  55  * A bit complex, but with all the combinations I think it's the best we can
  56  * get. NT4, W2k3 and W2k all have different combinations, but in the end we
  57  * have a signed&sealed lsa connection on all of them.
  58  *
  59  * Not sure if it is overkill, but it seems to work.
  60  */
  61
  62 struct init_domain_state {
  63         struct composite_context *ctx;
  64         struct wbsrv_domain *domain;
  65         struct wbsrv_service *service;
  66
  67         struct smb_composite_connect conn;
  68
  69         struct lsa_QueryInfoPolicy queryinfo;
  70 };
  71
  72 static void init_domain_recv_tree(struct composite_context *ctx);
  73 static void init_domain_recv_netlogoncreds(struct composite_context *ctx);
  74 static void init_domain_recv_netlogonpipe(struct composite_context *ctx);
  75 static void init_domain_recv_schannel(struct composite_context *ctx);
  76 static void init_domain_recv_lsa(struct composite_context *ctx);
  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 struct composite_context *wb_init_domain_send(TALLOC_CTX *mem_ctx,
  82                                               struct wbsrv_service *service,
  83                                               struct wb_dom_info *dom_info)
  84 {
  85         struct composite_context *result, *ctx;
  86         struct init_domain_state *state;
  87
  88         result = talloc(mem_ctx, struct composite_context);
  89         if (result == NULL) goto failed;
  90         result->state = COMPOSITE_STATE_IN_PROGRESS;
  91         result->async.fn = NULL;
  92         result->event_ctx = service->task->event_ctx;
  93
  94         state = talloc_zero(result, struct init_domain_state);
  95         if (state == NULL) goto failed;
  96         state->ctx = result;
  97         result->private_data = state;
  98
  99         state->service = service;
 100
 101         state->domain = talloc(state, struct wbsrv_domain);
 102         if (state->domain == NULL) goto failed;
 103
 104         state->domain->info = talloc_reference(state->domain, dom_info);
 105         if (state->domain->info == NULL) goto failed;
 106
 107         state->domain->schannel_creds = cli_credentials_init(state->domain);
 108         if (state->domain->schannel_creds == NULL) goto failed;
 109
 110         cli_credentials_set_conf(state->domain->schannel_creds);
 111         state->ctx->status =
 112                 cli_credentials_set_machine_account(state->domain->
 113                                                     schannel_creds);
 114         if (!NT_STATUS_IS_OK(state->ctx->status)) goto failed;
 115
 116         state->conn.in.dest_host = dom_info->dc_address;
 117         state->conn.in.port = 0;
 118         state->conn.in.called_name = dom_info->dc_name;
 119         state->conn.in.service = "IPC$";
 120         state->conn.in.service_type = "IPC";
 121         state->conn.in.workgroup = dom_info->name;
 122         state->conn.in.credentials = state->domain->schannel_creds;
 123
 124         state->conn.in.fallback_to_anonymous = True;
 125
 126         ctx = smb_composite_connect_send(&state->conn, state->domain,
 127                                          result->event_ctx);
 128         if (ctx == NULL) goto failed;
 129
 130         ctx->async.fn = init_domain_recv_tree;
 131         ctx->async.private_data = state;
 132         return result;
 133
 134  failed:
 135         talloc_free(result);
 136         return NULL;
 137 }
 138
 139 static void init_domain_recv_tree(struct composite_context *ctx)
 140 {
 141         struct init_domain_state *state =
 142                 talloc_get_type(ctx->async.private_data,
 143                                 struct init_domain_state);
 144         state->ctx->status = smb_composite_connect_recv(ctx, state);
 145         if (!composite_is_ok(state->ctx)) return;
 146
 147         if ((state->domain->schannel_creds != NULL) &&
 148             (!cli_credentials_is_anonymous(state->domain->schannel_creds)) &&
 149             ((lp_server_role() == ROLE_DOMAIN_MEMBER) &&
 150              (dom_sid_equal(state->domain->info->sid,
 151                             state->service->primary_sid)))) {
 152                 ctx = wb_get_schannel_creds_send(state,
 153                                                  state->domain->schannel_creds,
 154                                                  state->conn.out.tree,
 155                                                  state->ctx->event_ctx);
 156                 composite_continue(state->ctx, ctx,
 157                                    init_domain_recv_netlogoncreds, state);
 158                 return;
 159         }
 160
 161         ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 162         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 163 }
 164
 165 static void init_domain_recv_netlogoncreds(struct composite_context *ctx)
 166 {
 167         struct init_domain_state *state =
 168                 talloc_get_type(ctx->async.private_data,
 169                                 struct init_domain_state);
 170         struct dcerpc_pipe *auth2_pipe;
 171         struct smbcli_tree *tree = NULL;
 172
 173         state->ctx->status =
 174                 wb_get_schannel_creds_recv(ctx, state, &auth2_pipe);
 175         if (!composite_is_ok(state->ctx)) return;
 176
 177         if (!lp_winbind_sealed_pipes()) {
 178                 state->domain->netlogon_pipe = talloc_reference(state->domain,
 179                                                                 auth2_pipe);
 180                 ctx = wb_connect_lsa_send(state, state->conn.out.tree, NULL);
 181                 composite_continue(state->ctx, ctx, init_domain_recv_lsa,
 182                                    state);
 183                 return;
 184         }
 185
 186         state->domain->netlogon_pipe =
 187                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 188         if (composite_nomem(state->domain->netlogon_pipe, state->ctx)) return;
 189
 190         tree = dcerpc_smb_tree(auth2_pipe->conn);
 191         if (tree == NULL) {
 192                 composite_error(state->ctx, NT_STATUS_INTERNAL_ERROR);
 193                 return;
 194         }
 195
 196         ctx = dcerpc_pipe_open_smb_send(state->domain->netlogon_pipe->conn,
 197                                         tree, "\\netlogon");
 198         composite_continue(state->ctx, ctx, init_domain_recv_netlogonpipe,
 199                            state);
 200 }
 201
 202 static void init_domain_recv_netlogonpipe(struct composite_context *ctx)
 203 {
 204         struct init_domain_state *state =
 205                 talloc_get_type(ctx->async.private_data,
 206                                 struct init_domain_state);
 207
 208         state->ctx->status = dcerpc_pipe_open_smb_recv(ctx);
 209         if (!composite_is_ok(state->ctx)) return;
 210
 211         state->domain->netlogon_pipe->conn->flags |=
 212                 (DCERPC_SIGN | DCERPC_SEAL);
 213         ctx = dcerpc_bind_auth_send(state, state->domain->netlogon_pipe,
 214                                     &dcerpc_table_netlogon,
 215                                     state->domain->schannel_creds,
 216                                     DCERPC_AUTH_TYPE_SCHANNEL,
 217                                     DCERPC_AUTH_LEVEL_PRIVACY,
 218                                     NULL);
 219         composite_continue(state->ctx, ctx, init_domain_recv_schannel, state);
 220 }
 221
 222 static void init_domain_recv_schannel(struct composite_context *ctx)
 223 {
 224         struct init_domain_state *state =
 225                 talloc_get_type(ctx->async.private_data,
 226                                 struct init_domain_state);
 227
 228         state->ctx->status = dcerpc_bind_auth_recv(ctx);
 229         if (!composite_is_ok(state->ctx)) return;
 230
 231         ctx = wb_connect_lsa_send(state, state->conn.out.tree,
 232                                   state->domain->schannel_creds);
 233         composite_continue(state->ctx, ctx, init_domain_recv_lsa, state);
 234 }
 235
 236 static void init_domain_recv_lsa(struct composite_context *ctx)
 237 {
 238         struct init_domain_state *state =
 239                 talloc_get_type(ctx->async.private_data,
 240                                 struct init_domain_state);
 241
 242         struct rpc_request *req;
 243
 244         state->ctx->status = wb_connect_lsa_recv(ctx, state->domain,
 245                                                  &state->domain->lsa_auth_type,
 246                                                  &state->domain->lsa_pipe,
 247                                                  &state->domain->lsa_policy);
 248         if (!composite_is_ok(state->ctx)) return;
 249
 250         /* Give the tree to the pipes. */
 251         talloc_unlink(state, state->conn.out.tree);
 252
 253         state->queryinfo.in.handle = state->domain->lsa_policy;
 254         state->queryinfo.in.level = LSA_POLICY_INFO_ACCOUNT_DOMAIN;
 255
 256         req = dcerpc_lsa_QueryInfoPolicy_send(state->domain->lsa_pipe, state,
 257                                               &state->queryinfo);
 258         composite_continue_rpc(state->ctx, req,
 259                                init_domain_recv_queryinfo, state);
 260 }
 261
 262 static void init_domain_recv_queryinfo(struct rpc_request *req)
 263 {
 264         struct init_domain_state *state =
 265                 talloc_get_type(req->async.private, struct init_domain_state);
 266         struct lsa_DomainInfo *dominfo;
 267         struct composite_context *ctx;
 268         const char *ldap_url;
 269
 270         state->ctx->status = dcerpc_ndr_request_recv(req);
 271         if (!composite_is_ok(state->ctx)) return;
 272         state->ctx->status = state->queryinfo.out.result;
 273         if (!composite_is_ok(state->ctx)) return;
 274
 275         dominfo = &state->queryinfo.out.info->account_domain;
 276
 277         if (strcasecmp(state->domain->info->name, dominfo->name.string) != 0) {
 278                 DEBUG(2, ("Expected domain name %s, DC %s said %s\n",
 279                           state->domain->info->name,
 280                           dcerpc_server_name(state->domain->lsa_pipe),
 281                           dominfo->name.string));
 282                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 283                 return;
 284         }
 285
 286         if (!dom_sid_equal(state->domain->info->sid, dominfo->sid)) {
 287                 DEBUG(2, ("Expected domain sid %s, DC %s said %s\n",
 288                           dom_sid_string(state, state->domain->info->sid),
 289                           dcerpc_server_name(state->domain->lsa_pipe),
 290                           dom_sid_string(state, dominfo->sid)));
 291                 composite_error(state->ctx, NT_STATUS_INVALID_DOMAIN_STATE);
 292                 return;
 293         }
 294
 295         state->domain->ldap_conn =
 296                 ldap_new_connection(state->domain, state->ctx->event_ctx);
 297         composite_nomem(state->domain->ldap_conn, state->ctx);
 298
 299         ldap_url = talloc_asprintf(state, "ldap://%s/",
 300                                    state->domain->info->dc_address);
 301         composite_nomem(ldap_url, state->ctx);
 302
 303         ctx = ldap_connect_send(state->domain->ldap_conn, ldap_url);
 304         composite_continue(state->ctx, ctx, init_domain_recv_ldapconn, state);
 305 }
 306
 307 static void init_domain_recv_ldapconn(struct composite_context *ctx)
 308 {
 309         struct init_domain_state *state =
 310                 talloc_get_type(ctx->async.private_data,
 311                                 struct init_domain_state);
 312
 313         state->ctx->status = ldap_connect_recv(ctx);
 314         if (NT_STATUS_IS_OK(state->ctx->status)) {
 315                 state->domain->ldap_conn->host =
 316                         talloc_strdup(state->domain->ldap_conn,
 317                                       state->domain->info->dc_name);
 318                 state->ctx->status =
 319                         ldap_bind_sasl(state->domain->ldap_conn,
 320                                        state->domain->schannel_creds);
 321                 DEBUG(0, ("ldap_bind returned %s\n",
 322                           nt_errstr(state->ctx->status)));
 323         }
 324
 325         state->domain->samr_pipe =
 326                 dcerpc_pipe_init(state->domain, state->ctx->event_ctx);
 327         if (composite_nomem(state->domain->samr_pipe, state->ctx)) return;
 328
 329         ctx = wb_connect_sam_send(state, state->conn.out.tree,
 330                                   state->domain->lsa_auth_type,
 331                                   state->domain->schannel_creds,
 332                                   state->domain->info->sid);
 333         composite_continue(state->ctx, ctx, init_domain_recv_samr, state);
 334 }
 335
 336 static void init_domain_recv_samr(struct composite_context *ctx)
 337 {
 338         struct init_domain_state *state =
 339                 talloc_get_type(ctx->async.private_data,
 340                                 struct init_domain_state);
 341
 342         state->ctx->status = wb_connect_sam_recv(
 343                 ctx, state->domain, &state->domain->samr_pipe,
 344                 &state->domain->samr_handle, &state->domain->domain_handle);
 345         if (!composite_is_ok(state->ctx)) return;
 346
 347         composite_done(state->ctx);
 348 }
 349
 350 NTSTATUS wb_init_domain_recv(struct composite_context *c,
 351                              TALLOC_CTX *mem_ctx,
 352                              struct wbsrv_domain **result)
 353 {
 354         NTSTATUS status = composite_wait(c);
 355         if (NT_STATUS_IS_OK(status)) {
 356                 struct init_domain_state *state =
 357                         talloc_get_type(c->private_data,
 358                                         struct init_domain_state);
 359                 *result = talloc_steal(mem_ctx, state->domain);
 360         }
 361         talloc_free(c);
 362         return status;
 363 }
 364
 365 NTSTATUS wb_init_domain(TALLOC_CTX *mem_ctx, struct wbsrv_service *service,
 366                         struct wb_dom_info *dom_info,
 367                         struct wbsrv_domain **result)
 368 {
 369         struct composite_context *c =
 370                 wb_init_domain_send(mem_ctx, service, dom_info);
 371         return wb_init_domain_recv(c, mem_ctx, result);
 372 }