source4/ldap_server/ldap_bind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    LDAP server
   4    Copyright (C) Stefan Metzmacher 2004
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "ldap_server/ldap_server.h"
  22 #include "auth/auth.h"
  23 #include "samba/service.h"
  24 #include <ldb.h>
  25 #include <ldb_errors.h>
  26 #include "../lib/util/dlinklist.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "auth/gensec/gensec_tstream.h"
  30 #include "lib/tls/tls.h"
  31 #include "param/param.h"
  32 #include "../lib/util/tevent_ntstatus.h"
  33 #include "lib/util/time_basic.h"
  34
  35 static char *ldapsrv_bind_error_msg(TALLOC_CTX *mem_ctx,
  36                                     HRESULT hresult,
  37                                     uint32_t DSID,
  38                                     NTSTATUS status)
  39 {
  40         WERROR werr;
  41         char *msg = NULL;
  42
  43         status = nt_status_squash(status);
  44         werr = ntstatus_to_werror(status);
  45
  46         /*
  47          * There are 4 lower case hex digits following 'v' at the end,
  48          * but different Windows Versions return different values:
  49          *
  50          * Windows 2008R2 uses 'v1db1'
  51          * Windows 2012R2 uses 'v2580'
  52          *
  53          * We just match Windows 2008R2 as that's what was referenced
  54          * in https://bugzilla.samba.org/show_bug.cgi?id=9048
  55          */
  56         msg = talloc_asprintf(mem_ctx, "%08X: LdapErr: DSID-%08X, comment: "
  57                               "AcceptSecurityContext error, data %x, v1db1",
  58                               (unsigned)HRES_ERROR_V(hresult),
  59                               (unsigned)DSID,
  60                               (unsigned)W_ERROR_V(werr));
  61
  62         return msg;
  63 }
  64
  65 struct ldapsrv_bind_wait_context {
  66         struct ldapsrv_reply *reply;
  67         struct tevent_req *req;
  68         NTSTATUS status;
  69         bool done;
  70 };
  71
  72 struct ldapsrv_bind_wait_state {
  73         uint8_t dummy;
  74 };
  75
  76 static struct tevent_req *ldapsrv_bind_wait_send(TALLOC_CTX *mem_ctx,
  77                                                  struct tevent_context *ev,
  78                                                  void *private_data)
  79 {
  80         struct ldapsrv_bind_wait_context *bind_wait =
  81                 talloc_get_type_abort(private_data,
  82                 struct ldapsrv_bind_wait_context);
  83         struct tevent_req *req;
  84         struct ldapsrv_bind_wait_state *state;
  85
  86         req = tevent_req_create(mem_ctx, &state,
  87                                 struct ldapsrv_bind_wait_state);
  88         if (req == NULL) {
  89                 return NULL;
  90         }
  91         bind_wait->req = req;
  92
  93         tevent_req_defer_callback(req, ev);
  94
  95         if (!bind_wait->done) {
  96                 return req;
  97         }
  98
  99         if (tevent_req_nterror(req, bind_wait->status)) {
 100                 return tevent_req_post(req, ev);
 101         }
 102
 103         tevent_req_done(req);
 104         return tevent_req_post(req, ev);
 105 }
 106
 107 static NTSTATUS ldapsrv_bind_wait_recv(struct tevent_req *req)
 108 {
 109         return tevent_req_simple_recv_ntstatus(req);
 110 }
 111
 112 static NTSTATUS ldapsrv_bind_wait_setup(struct ldapsrv_call *call,
 113                                         struct ldapsrv_reply *reply)
 114 {
 115         struct ldapsrv_bind_wait_context *bind_wait = NULL;
 116
 117         if (call->wait_private != NULL) {
 118                 return NT_STATUS_INTERNAL_ERROR;
 119         }
 120
 121         bind_wait = talloc_zero(call, struct ldapsrv_bind_wait_context);
 122         if (bind_wait == NULL) {
 123                 return NT_STATUS_NO_MEMORY;
 124         }
 125         bind_wait->reply = reply;
 126
 127         call->wait_private = bind_wait;
 128         call->wait_send = ldapsrv_bind_wait_send;
 129         call->wait_recv = ldapsrv_bind_wait_recv;
 130         return NT_STATUS_OK;
 131 }
 132
 133 static void ldapsrv_bind_wait_finished(struct ldapsrv_call *call,
 134                                        NTSTATUS status)
 135 {
 136         struct ldapsrv_bind_wait_context *bind_wait =
 137                 talloc_get_type_abort(call->wait_private,
 138                 struct ldapsrv_bind_wait_context);
 139
 140         bind_wait->done = true;
 141         bind_wait->status = status;
 142
 143         if (bind_wait->req == NULL) {
 144                 return;
 145         }
 146
 147         if (tevent_req_nterror(bind_wait->req, status)) {
 148                 return;
 149         }
 150
 151         tevent_req_done(bind_wait->req);
 152 }
 153
 154 static void ldapsrv_BindSimple_done(struct tevent_req *subreq);
 155
 156 static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
 157 {
 158         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 159         struct ldapsrv_reply *reply = NULL;
 160         struct ldap_BindResponse *resp = NULL;
 161         int result;
 162         const char *errstr = NULL;
 163         NTSTATUS status;
 164         bool using_tls = call->conn->sockets.active == call->conn->sockets.tls;
 165         struct tevent_req *subreq = NULL;
 166
 167         DEBUG(10, ("BindSimple dn: %s\n",req->dn));
 168
 169         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 170         if (!reply) {
 171                 return NT_STATUS_NO_MEMORY;
 172         }
 173
 174         if (req->dn != NULL &&
 175             strlen(req->dn) != 0 &&
 176             call->conn->require_strong_auth > LDAP_SERVER_REQUIRE_STRONG_AUTH_NO &&
 177             !using_tls)
 178         {
 179                 status = NT_STATUS_NETWORK_ACCESS_DENIED;
 180                 result = LDAP_STRONG_AUTH_REQUIRED;
 181                 errstr = talloc_asprintf(reply,
 182                                          "BindSimple: Transport encryption required.");
 183                 goto do_reply;
 184         }
 185
 186         subreq = authenticate_ldap_simple_bind_send(call,
 187                                         call->conn->connection->event.ctx,
 188                                         call->conn->connection->msg_ctx,
 189                                         call->conn->lp_ctx,
 190                                         call->conn->connection->remote_address,
 191                                         call->conn->connection->local_address,
 192                                         using_tls,
 193                                         req->dn,
 194                                         req->creds.password);
 195         if (subreq == NULL) {
 196                 return NT_STATUS_NO_MEMORY;
 197         }
 198         tevent_req_set_callback(subreq, ldapsrv_BindSimple_done, call);
 199
 200         status = ldapsrv_bind_wait_setup(call, reply);
 201         if (!NT_STATUS_IS_OK(status)) {
 202                 TALLOC_FREE(subreq);
 203                 return status;
 204         }
 205
 206         /*
 207          * The rest will be async.
 208          */
 209         return NT_STATUS_OK;
 210
 211 do_reply:
 212         resp = &reply->msg->r.BindResponse;
 213         resp->response.resultcode = result;
 214         resp->response.errormessage = errstr;
 215         resp->response.dn = NULL;
 216         resp->response.referral = NULL;
 217         resp->SASL.secblob = NULL;
 218
 219         ldapsrv_queue_reply(call, reply);
 220         return NT_STATUS_OK;
 221 }
 222
 223 static void ldapsrv_BindSimple_done(struct tevent_req *subreq)
 224 {
 225         struct ldapsrv_call *call =
 226                 tevent_req_callback_data(subreq,
 227                 struct ldapsrv_call);
 228         struct ldapsrv_bind_wait_context *bind_wait =
 229                 talloc_get_type_abort(call->wait_private,
 230                 struct ldapsrv_bind_wait_context);
 231         struct ldapsrv_reply *reply = bind_wait->reply;
 232         struct auth_session_info *session_info = NULL;
 233         NTSTATUS status;
 234         struct ldap_BindResponse *resp = NULL;
 235         int result;
 236         const char *errstr = NULL;
 237
 238         status = authenticate_ldap_simple_bind_recv(subreq,
 239                                                     call,
 240                                                     &session_info);
 241         if (NT_STATUS_IS_OK(status)) {
 242                 char *ldb_errstring = NULL;
 243                 result = LDAP_SUCCESS;
 244                 errstr = NULL;
 245
 246                 talloc_unlink(call->conn, call->conn->session_info);
 247                 call->conn->session_info = talloc_steal(call->conn, session_info);
 248
 249                 call->conn->authz_logged = true;
 250
 251                 /* don't leak the old LDB */
 252                 talloc_unlink(call->conn, call->conn->ldb);
 253
 254                 result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
 255
 256                 if (result != LDB_SUCCESS) {
 257                         /* Only put the detailed error in DEBUG() */
 258                         DBG_ERR("ldapsrv_backend_Init failed: %s: %s\n",
 259                                 ldb_errstring, ldb_strerror(result));
 260                         errstr = talloc_strdup(reply,
 261                                                "Simple Bind: Failed to advise "
 262                                                "ldb new credentials");
 263                         result = LDB_ERR_OPERATIONS_ERROR;
 264                 }
 265         } else {
 266                 status = nt_status_squash(status);
 267
 268                 result = LDAP_INVALID_CREDENTIALS;
 269                 errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_INVALID_TOKEN,
 270                                                 0x0C0903A9, status);
 271         }
 272
 273         resp = &reply->msg->r.BindResponse;
 274         resp->response.resultcode = result;
 275         resp->response.errormessage = errstr;
 276         resp->response.dn = NULL;
 277         resp->response.referral = NULL;
 278         resp->SASL.secblob = NULL;
 279
 280         ldapsrv_queue_reply(call, reply);
 281         ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
 282 }
 283
 284 struct ldapsrv_sasl_postprocess_context {
 285         struct ldapsrv_connection *conn;
 286         struct tstream_context *sasl;
 287 };
 288
 289 struct ldapsrv_sasl_postprocess_state {
 290         uint8_t dummy;
 291 };
 292
 293 static struct tevent_req *ldapsrv_sasl_postprocess_send(TALLOC_CTX *mem_ctx,
 294                                                 struct tevent_context *ev,
 295                                                 void *private_data)
 296 {
 297         struct ldapsrv_sasl_postprocess_context *context =
 298                 talloc_get_type_abort(private_data,
 299                 struct ldapsrv_sasl_postprocess_context);
 300         struct tevent_req *req;
 301         struct ldapsrv_sasl_postprocess_state *state;
 302
 303         req = tevent_req_create(mem_ctx, &state,
 304                                 struct ldapsrv_sasl_postprocess_state);
 305         if (req == NULL) {
 306                 return NULL;
 307         }
 308
 309         TALLOC_FREE(context->conn->sockets.sasl);
 310         context->conn->sockets.sasl = talloc_move(context->conn, &context->sasl);
 311         context->conn->sockets.active = context->conn->sockets.sasl;
 312
 313         tevent_req_done(req);
 314         return tevent_req_post(req, ev);
 315 }
 316
 317 static NTSTATUS ldapsrv_sasl_postprocess_recv(struct tevent_req *req)
 318 {
 319         return tevent_req_simple_recv_ntstatus(req);
 320 }
 321
 322 static NTSTATUS ldapsrv_setup_gensec(struct ldapsrv_connection *conn,
 323                                      const char *sasl_mech,
 324                                      struct gensec_security **_gensec_security)
 325 {
 326         NTSTATUS status;
 327
 328         struct gensec_security *gensec_security;
 329
 330         status = samba_server_gensec_start(conn,
 331                                            conn->connection->event.ctx,
 332                                            conn->connection->msg_ctx,
 333                                            conn->lp_ctx,
 334                                            conn->server_credentials,
 335                                            "ldap",
 336                                            &gensec_security);
 337         if (!NT_STATUS_IS_OK(status)) {
 338                 return status;
 339         }
 340
 341         status = gensec_set_target_service_description(gensec_security,
 342                                                        "LDAP");
 343         if (!NT_STATUS_IS_OK(status)) {
 344                 return status;
 345         }
 346
 347         status = gensec_set_remote_address(gensec_security,
 348                                            conn->connection->remote_address);
 349         if (!NT_STATUS_IS_OK(status)) {
 350                 return status;
 351         }
 352
 353         status = gensec_set_local_address(gensec_security,
 354                                           conn->connection->local_address);
 355         if (!NT_STATUS_IS_OK(status)) {
 356                 return status;
 357         }
 358
 359         gensec_want_feature(gensec_security, GENSEC_FEATURE_ASYNC_REPLIES);
 360         gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAP_STYLE);
 361
 362         if (conn->sockets.active == conn->sockets.tls) {
 363                 uint32_t initiator_addrtype = 0;
 364                 const DATA_BLOB *initiator_address = NULL;
 365                 uint32_t acceptor_addrtype = 0;
 366                 const DATA_BLOB *acceptor_address = NULL;
 367                 const DATA_BLOB *application_data =
 368                         tstream_tls_channel_bindings(conn->sockets.tls);
 369
 370                 status = gensec_set_channel_bindings(gensec_security,
 371                                                      initiator_addrtype,
 372                                                      initiator_address,
 373                                                      acceptor_addrtype,
 374                                                      acceptor_address,
 375                                                      application_data);
 376                 if (!NT_STATUS_IS_OK(status)) {
 377                         return status;
 378                 }
 379
 380                 /*
 381                  * By default channel bindings are required,
 382                  * so we only set GENSEC_FEATURE_CB_OPTIONAL
 383                  * for the legacy option:
 384                  *
 385                  * ldap server require strong auth = no
 386                  * or
 387                  * ldap server require strong auth =
 388                  *    allow_sasl_without_tls_channel_bindings
 389                  *
 390                  * And this as an alias to cope with existing smb.conf
 391                  * files:
 392                  *
 393                  * ldap server require strong auth = allow_sasl_over_tls
 394                  */
 395                 switch (conn->require_strong_auth) {
 396                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
 397                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
 398                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_WITHOUT_TLS_CB:
 399                         gensec_want_feature(gensec_security,
 400                                             GENSEC_FEATURE_CB_OPTIONAL);
 401                         break;
 402                 default:
 403                         break;
 404                 }
 405
 406                 gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAPS_TRANSPORT);
 407         }
 408
 409         status = gensec_start_mech_by_sasl_name(gensec_security, sasl_mech);
 410
 411         if (!NT_STATUS_IS_OK(status)) {
 412                 return status;
 413         }
 414
 415         *_gensec_security = gensec_security;
 416         return status;
 417 }
 418
 419 static void ldapsrv_BindSASL_done(struct tevent_req *subreq);
 420
 421 static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
 422 {
 423         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 424         struct ldapsrv_reply *reply;
 425         struct ldap_BindResponse *resp;
 426         struct ldapsrv_connection *conn;
 427         int result = 0;
 428         const char *errstr=NULL;
 429         NTSTATUS status = NT_STATUS_OK;
 430         DATA_BLOB input = data_blob_null;
 431         struct tevent_req *subreq = NULL;
 432
 433         DEBUG(10, ("BindSASL dn: %s\n",req->dn));
 434
 435         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 436         if (!reply) {
 437                 return NT_STATUS_NO_MEMORY;
 438         }
 439         resp = &reply->msg->r.BindResponse;
 440         /* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
 441         resp->SASL.secblob = talloc_zero(reply, DATA_BLOB);
 442         if (resp->SASL.secblob == NULL) {
 443                 return NT_STATUS_NO_MEMORY;
 444         }
 445
 446         conn = call->conn;
 447
 448         /*
 449          * TODO: a SASL bind with a different mechanism
 450          *       should cancel an inprogress SASL bind.
 451          *       (see RFC 4513)
 452          */
 453
 454         if (!conn->gensec) {
 455                 status = ldapsrv_setup_gensec(conn, req->creds.SASL.mechanism,
 456                                               &conn->gensec);
 457                 if (!NT_STATUS_IS_OK(status)) {
 458                         DEBUG(1, ("Failed to start GENSEC server for [%s] code: %s\n",
 459                                   ldb_binary_encode_string(call, req->creds.SASL.mechanism),
 460                                   nt_errstr(status)));
 461                         result = LDAP_OPERATIONS_ERROR;
 462                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 463                                                  nt_errstr(status));
 464                         goto do_reply;
 465                 }
 466         }
 467
 468         if (req->creds.SASL.secblob) {
 469                 input = *req->creds.SASL.secblob;
 470         }
 471
 472         subreq = gensec_update_send(call, conn->connection->event.ctx,
 473                                     conn->gensec, input);
 474         if (subreq == NULL) {
 475                 return NT_STATUS_NO_MEMORY;
 476         }
 477         tevent_req_set_callback(subreq, ldapsrv_BindSASL_done, call);
 478
 479         status = ldapsrv_bind_wait_setup(call, reply);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 TALLOC_FREE(subreq);
 482                 return status;
 483         }
 484
 485         /*
 486          * The rest will be async.
 487          */
 488         return NT_STATUS_OK;
 489
 490 do_reply:
 491         if (result != LDAP_SASL_BIND_IN_PROGRESS) {
 492                 /*
 493                  * We should destroy the gensec context
 494                  * when we hit a fatal error.
 495                  *
 496                  * Note: conn->gensec is already cleared
 497                  * for the LDAP_SUCCESS case.
 498                  */
 499                 talloc_unlink(conn, conn->gensec);
 500                 conn->gensec = NULL;
 501         }
 502
 503         resp->response.resultcode = result;
 504         resp->response.dn = NULL;
 505         resp->response.errormessage = errstr;
 506         resp->response.referral = NULL;
 507
 508         ldapsrv_queue_reply(call, reply);
 509         return NT_STATUS_OK;
 510 }
 511
 512 static void ldapsrv_BindSASL_done(struct tevent_req *subreq)
 513 {
 514         struct ldapsrv_call *call =
 515                 tevent_req_callback_data(subreq,
 516                 struct ldapsrv_call);
 517         struct ldapsrv_bind_wait_context *bind_wait =
 518                 talloc_get_type_abort(call->wait_private,
 519                 struct ldapsrv_bind_wait_context);
 520         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 521         struct ldapsrv_reply *reply = bind_wait->reply;
 522         struct ldap_BindResponse *resp = &reply->msg->r.BindResponse;
 523         struct ldapsrv_connection *conn = call->conn;
 524         struct auth_session_info *session_info = NULL;
 525         struct ldapsrv_sasl_postprocess_context *context = NULL;
 526         NTSTATUS status;
 527         int result;
 528         const char *errstr = NULL;
 529         char *ldb_errstring = NULL;
 530         DATA_BLOB output = data_blob_null;
 531         NTTIME expire_time_nt;
 532
 533         status = gensec_update_recv(subreq, call, &output);
 534         TALLOC_FREE(subreq);
 535
 536         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 537                 *resp->SASL.secblob = output;
 538                 result = LDAP_SASL_BIND_IN_PROGRESS;
 539                 errstr = NULL;
 540                 goto do_reply;
 541         }
 542
 543         if (NT_STATUS_EQUAL(status, NT_STATUS_BAD_BINDINGS)) {
 544                 result = LDAP_INVALID_CREDENTIALS;
 545                 errstr = ldapsrv_bind_error_msg(reply,
 546                                                 HRES_SEC_E_BAD_BINDINGS,
 547                                                 0x0C090711,
 548                                                 status);
 549                 goto do_reply;
 550         }
 551         if (!NT_STATUS_IS_OK(status)) {
 552                 status = nt_status_squash(status);
 553                 result = LDAP_INVALID_CREDENTIALS;
 554                 errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_LOGON_DENIED,
 555                                                 0x0C0904DC, status);
 556                 goto do_reply;
 557         }
 558
 559         if (gensec_have_feature(conn->gensec, GENSEC_FEATURE_SIGN) ||
 560             gensec_have_feature(conn->gensec, GENSEC_FEATURE_SEAL)) {
 561
 562                 context = talloc_zero(call, struct ldapsrv_sasl_postprocess_context);
 563                 if (context == NULL) {
 564                         ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
 565                         return;
 566                 }
 567         }
 568
 569         if (context && conn->sockets.tls) {
 570                 TALLOC_FREE(context);
 571                 status = NT_STATUS_NOT_SUPPORTED;
 572                 result = LDAP_UNWILLING_TO_PERFORM;
 573                 errstr = talloc_asprintf(reply,
 574                                          "SASL:[%s]: Sign or Seal are not allowed if TLS is used",
 575                                          req->creds.SASL.mechanism);
 576                 goto do_reply;
 577         }
 578
 579         if (context && conn->sockets.sasl) {
 580                 TALLOC_FREE(context);
 581                 status = NT_STATUS_NOT_SUPPORTED;
 582                 result = LDAP_UNWILLING_TO_PERFORM;
 583                 errstr = talloc_asprintf(reply,
 584                                          "SASL:[%s]: Sign or Seal are not allowed if SASL encryption has already been set up",
 585                                          req->creds.SASL.mechanism);
 586                 goto do_reply;
 587         }
 588
 589         if (context == NULL) {
 590                 switch (call->conn->require_strong_auth) {
 591                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
 592                         break;
 593                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
 594                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_WITHOUT_TLS_CB:
 595                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_YES:
 596                         if (call->conn->sockets.active == call->conn->sockets.tls) {
 597                                 break;
 598                         }
 599                         status = NT_STATUS_NETWORK_ACCESS_DENIED;
 600                         result = LDAP_STRONG_AUTH_REQUIRED;
 601                         errstr = talloc_asprintf(reply,
 602                                          "SASL:[%s]: Sign or Seal are required.",
 603                                          req->creds.SASL.mechanism);
 604                         goto do_reply;
 605                 }
 606         }
 607
 608         if (context != NULL) {
 609                 context->conn = conn;
 610                 status = gensec_create_tstream(context,
 611                                                context->conn->gensec,
 612                                                context->conn->sockets.raw,
 613                                                &context->sasl);
 614                 if (!NT_STATUS_IS_OK(status)) {
 615                         result = LDAP_OPERATIONS_ERROR;
 616                         errstr = talloc_asprintf(reply,
 617                                          "SASL:[%s]: Failed to setup SASL socket: %s",
 618                                          req->creds.SASL.mechanism, nt_errstr(status));
 619                         goto do_reply;
 620                 }
 621         }
 622
 623         status = gensec_session_info(conn->gensec, call, &session_info);
 624         if (!NT_STATUS_IS_OK(status)) {
 625                 result = LDAP_OPERATIONS_ERROR;
 626                 errstr = talloc_asprintf(reply,
 627                                          "SASL:[%s]: Failed to get session info: %s",
 628                                          req->creds.SASL.mechanism, nt_errstr(status));
 629                 goto do_reply;
 630         }
 631
 632         talloc_unlink(conn, conn->session_info);
 633         conn->session_info = talloc_steal(conn, session_info);
 634
 635         /* don't leak the old LDB */
 636         talloc_unlink(conn, conn->ldb);
 637
 638         call->conn->authz_logged = true;
 639
 640         result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
 641
 642         if (result != LDB_SUCCESS) {
 643                 /* Only put the detailed error in DEBUG() */
 644                 DBG_ERR("ldapsrv_backend_Init failed: %s: %s\n",
 645                         ldb_errstring, ldb_strerror(result));
 646                 errstr = talloc_strdup(reply,
 647                                        "SASL Bind: Failed to advise "
 648                                        "ldb new credentials");
 649                 result = LDB_ERR_OPERATIONS_ERROR;
 650                 goto do_reply;
 651         }
 652
 653         expire_time_nt = gensec_expire_time(conn->gensec);
 654         if (expire_time_nt != GENSEC_EXPIRE_TIME_INFINITY) {
 655                 struct timeval_buf buf;
 656
 657                 nttime_to_timeval(&conn->limits.expire_time, expire_time_nt);
 658
 659                 DBG_DEBUG("Setting connection expire_time to %s\n",
 660                           timeval_str_buf(&conn->limits.expire_time,
 661                                           false,
 662                                           true,
 663                                           &buf));
 664         }
 665
 666         if (context != NULL) {
 667                 const void *ptr = NULL;
 668
 669                 ptr = talloc_reparent(conn, context->sasl, conn->gensec);
 670                 if (ptr == NULL) {
 671                         ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
 672                         return;
 673                 }
 674
 675                 call->postprocess_send = ldapsrv_sasl_postprocess_send;
 676                 call->postprocess_recv = ldapsrv_sasl_postprocess_recv;
 677                 call->postprocess_private = context;
 678         } else {
 679                 talloc_unlink(conn, conn->gensec);
 680         }
 681         conn->gensec = NULL;
 682
 683         *resp->SASL.secblob = output;
 684         result = LDAP_SUCCESS;
 685         errstr = NULL;
 686
 687 do_reply:
 688         if (result != LDAP_SASL_BIND_IN_PROGRESS) {
 689                 /*
 690                  * We should destroy the gensec context
 691                  * when we hit a fatal error.
 692                  *
 693                  * Note: conn->gensec is already cleared
 694                  * for the LDAP_SUCCESS case.
 695                  */
 696                 talloc_unlink(conn, conn->gensec);
 697                 conn->gensec = NULL;
 698         }
 699
 700         resp->response.resultcode = result;
 701         resp->response.dn = NULL;
 702         resp->response.errormessage = errstr;
 703         resp->response.referral = NULL;
 704
 705         ldapsrv_queue_reply(call, reply);
 706         ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
 707 }
 708
 709 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 710 {
 711         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 712         struct ldapsrv_reply *reply;
 713         struct ldap_BindResponse *resp;
 714
 715         if (call->conn->pending_calls != NULL) {
 716                 reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 717                 if (!reply) {
 718                         return NT_STATUS_NO_MEMORY;
 719                 }
 720
 721                 resp = &reply->msg->r.BindResponse;
 722                 resp->response.resultcode = LDAP_BUSY;
 723                 resp->response.dn = NULL;
 724                 resp->response.errormessage = talloc_asprintf(reply, "Pending requests on this LDAP session");
 725                 resp->response.referral = NULL;
 726                 resp->SASL.secblob = NULL;
 727
 728                 ldapsrv_queue_reply(call, reply);
 729                 return NT_STATUS_OK;
 730         }
 731
 732         /*
 733          * TODO: a simple bind should cancel an
 734          *       inprogress SASL bind.
 735          *       (see RFC 4513)
 736          */
 737         switch (req->mechanism) {
 738                 case LDAP_AUTH_MECH_SIMPLE:
 739                         return ldapsrv_BindSimple(call);
 740                 case LDAP_AUTH_MECH_SASL:
 741                         return ldapsrv_BindSASL(call);
 742         }
 743
 744         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 745         if (!reply) {
 746                 return NT_STATUS_NO_MEMORY;
 747         }
 748
 749         resp = &reply->msg->r.BindResponse;
 750         resp->response.resultcode = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 751         resp->response.dn = NULL;
 752         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 753         resp->response.referral = NULL;
 754         resp->SASL.secblob = NULL;
 755
 756         ldapsrv_queue_reply(call, reply);
 757         return NT_STATUS_OK;
 758 }
 759
 760 struct ldapsrv_unbind_wait_context {
 761         uint8_t dummy;
 762 };
 763
 764 struct ldapsrv_unbind_wait_state {
 765         uint8_t dummy;
 766 };
 767
 768 static struct tevent_req *ldapsrv_unbind_wait_send(TALLOC_CTX *mem_ctx,
 769                                                  struct tevent_context *ev,
 770                                                  void *private_data)
 771 {
 772         struct ldapsrv_unbind_wait_context *unbind_wait =
 773                 talloc_get_type_abort(private_data,
 774                 struct ldapsrv_unbind_wait_context);
 775         struct tevent_req *req;
 776         struct ldapsrv_unbind_wait_state *state;
 777
 778         req = tevent_req_create(mem_ctx, &state,
 779                                 struct ldapsrv_unbind_wait_state);
 780         if (req == NULL) {
 781                 return NULL;
 782         }
 783
 784         (void)unbind_wait;
 785
 786         tevent_req_nterror(req, NT_STATUS_LOCAL_DISCONNECT);
 787         return tevent_req_post(req, ev);
 788 }
 789
 790 static NTSTATUS ldapsrv_unbind_wait_recv(struct tevent_req *req)
 791 {
 792         return tevent_req_simple_recv_ntstatus(req);
 793 }
 794
 795 static NTSTATUS ldapsrv_unbind_wait_setup(struct ldapsrv_call *call)
 796 {
 797         struct ldapsrv_unbind_wait_context *unbind_wait = NULL;
 798
 799         if (call->wait_private != NULL) {
 800                 return NT_STATUS_INTERNAL_ERROR;
 801         }
 802
 803         unbind_wait = talloc_zero(call, struct ldapsrv_unbind_wait_context);
 804         if (unbind_wait == NULL) {
 805                 return NT_STATUS_NO_MEMORY;
 806         }
 807
 808         call->wait_private = unbind_wait;
 809         call->wait_send = ldapsrv_unbind_wait_send;
 810         call->wait_recv = ldapsrv_unbind_wait_recv;
 811         return NT_STATUS_OK;
 812 }
 813
 814 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 815 {
 816         struct ldapsrv_call *c = NULL;
 817         struct ldapsrv_call *n = NULL;
 818
 819         DEBUG(10, ("UnbindRequest\n"));
 820
 821         for (c = call->conn->pending_calls; c != NULL; c = n) {
 822                 n = c->next;
 823
 824                 DLIST_REMOVE(call->conn->pending_calls, c);
 825                 TALLOC_FREE(c);
 826         }
 827
 828         return ldapsrv_unbind_wait_setup(call);
 829 }