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