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 #undef DBGC_CLASS
  36 #define DBGC_CLASS DBGC_LDAPSRV
  37
  38 static char *ldapsrv_bind_error_msg(TALLOC_CTX *mem_ctx,
  39                                     HRESULT hresult,
  40                                     uint32_t DSID,
  41                                     NTSTATUS status)
  42 {
  43         WERROR werr;
  44         char *msg = NULL;
  45
  46         status = nt_status_squash(status);
  47         werr = ntstatus_to_werror(status);
  48
  49         /*
  50          * There are 4 lower case hex digits following 'v' at the end,
  51          * but different Windows Versions return different values:
  52          *
  53          * Windows 2008R2 uses 'v1db1'
  54          * Windows 2012R2 uses 'v2580'
  55          *
  56          * We just match Windows 2008R2 as that's what was referenced
  57          * in https://bugzilla.samba.org/show_bug.cgi?id=9048
  58          */
  59         msg = talloc_asprintf(mem_ctx, "%08X: LdapErr: DSID-%08X, comment: "
  60                               "AcceptSecurityContext error, data %x, v1db1",
  61                               (unsigned)HRES_ERROR_V(hresult),
  62                               (unsigned)DSID,
  63                               (unsigned)W_ERROR_V(werr));
  64
  65         return msg;
  66 }
  67
  68 struct ldapsrv_bind_wait_context {
  69         struct ldapsrv_reply *reply;
  70         struct tevent_req *req;
  71         NTSTATUS status;
  72         bool done;
  73 };
  74
  75 struct ldapsrv_bind_wait_state {
  76         uint8_t dummy;
  77 };
  78
  79 static struct tevent_req *ldapsrv_bind_wait_send(TALLOC_CTX *mem_ctx,
  80                                                  struct tevent_context *ev,
  81                                                  void *private_data)
  82 {
  83         struct ldapsrv_bind_wait_context *bind_wait =
  84                 talloc_get_type_abort(private_data,
  85                 struct ldapsrv_bind_wait_context);
  86         struct tevent_req *req;
  87         struct ldapsrv_bind_wait_state *state;
  88
  89         req = tevent_req_create(mem_ctx, &state,
  90                                 struct ldapsrv_bind_wait_state);
  91         if (req == NULL) {
  92                 return NULL;
  93         }
  94         bind_wait->req = req;
  95
  96         tevent_req_defer_callback(req, ev);
  97
  98         if (!bind_wait->done) {
  99                 return req;
 100         }
 101
 102         if (tevent_req_nterror(req, bind_wait->status)) {
 103                 return tevent_req_post(req, ev);
 104         }
 105
 106         tevent_req_done(req);
 107         return tevent_req_post(req, ev);
 108 }
 109
 110 static NTSTATUS ldapsrv_bind_wait_recv(struct tevent_req *req)
 111 {
 112         return tevent_req_simple_recv_ntstatus(req);
 113 }
 114
 115 static NTSTATUS ldapsrv_bind_wait_setup(struct ldapsrv_call *call,
 116                                         struct ldapsrv_reply *reply)
 117 {
 118         struct ldapsrv_bind_wait_context *bind_wait = NULL;
 119
 120         if (call->wait_private != NULL) {
 121                 return NT_STATUS_INTERNAL_ERROR;
 122         }
 123
 124         bind_wait = talloc_zero(call, struct ldapsrv_bind_wait_context);
 125         if (bind_wait == NULL) {
 126                 return NT_STATUS_NO_MEMORY;
 127         }
 128         bind_wait->reply = reply;
 129
 130         call->wait_private = bind_wait;
 131         call->wait_send = ldapsrv_bind_wait_send;
 132         call->wait_recv = ldapsrv_bind_wait_recv;
 133         return NT_STATUS_OK;
 134 }
 135
 136 static void ldapsrv_bind_wait_finished(struct ldapsrv_call *call,
 137                                        NTSTATUS status)
 138 {
 139         struct ldapsrv_bind_wait_context *bind_wait =
 140                 talloc_get_type_abort(call->wait_private,
 141                 struct ldapsrv_bind_wait_context);
 142
 143         bind_wait->done = true;
 144         bind_wait->status = status;
 145
 146         if (bind_wait->req == NULL) {
 147                 return;
 148         }
 149
 150         if (tevent_req_nterror(bind_wait->req, status)) {
 151                 return;
 152         }
 153
 154         tevent_req_done(bind_wait->req);
 155 }
 156
 157 static void ldapsrv_BindSimple_done(struct tevent_req *subreq);
 158
 159 static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
 160 {
 161         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 162         struct ldapsrv_reply *reply = NULL;
 163         struct ldap_BindResponse *resp = NULL;
 164         int result;
 165         const char *errstr = NULL;
 166         NTSTATUS status;
 167         bool using_tls = call->conn->sockets.active == call->conn->sockets.tls;
 168         struct tevent_req *subreq = NULL;
 169
 170         DEBUG(10, ("BindSimple dn: %s\n",req->dn));
 171
 172         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 173         if (!reply) {
 174                 return NT_STATUS_NO_MEMORY;
 175         }
 176
 177         if (req->dn != NULL &&
 178             strlen(req->dn) != 0 &&
 179             call->conn->require_strong_auth > LDAP_SERVER_REQUIRE_STRONG_AUTH_NO &&
 180             !using_tls)
 181         {
 182                 status = NT_STATUS_NETWORK_ACCESS_DENIED;
 183                 result = LDAP_STRONG_AUTH_REQUIRED;
 184                 errstr = talloc_asprintf(reply,
 185                                          "BindSimple: Transport encryption required.");
 186                 goto do_reply;
 187         }
 188
 189         subreq = authenticate_ldap_simple_bind_send(call,
 190                                         call->conn->connection->event.ctx,
 191                                         call->conn->connection->msg_ctx,
 192                                         call->conn->lp_ctx,
 193                                         call->conn->connection->remote_address,
 194                                         call->conn->connection->local_address,
 195                                         using_tls,
 196                                         req->dn,
 197                                         req->creds.password);
 198         if (subreq == NULL) {
 199                 return NT_STATUS_NO_MEMORY;
 200         }
 201         tevent_req_set_callback(subreq, ldapsrv_BindSimple_done, call);
 202
 203         status = ldapsrv_bind_wait_setup(call, reply);
 204         if (!NT_STATUS_IS_OK(status)) {
 205                 TALLOC_FREE(subreq);
 206                 return status;
 207         }
 208
 209         /*
 210          * The rest will be async.
 211          */
 212         return NT_STATUS_OK;
 213
 214 do_reply:
 215         resp = &reply->msg->r.BindResponse;
 216         resp->response.resultcode = result;
 217         resp->response.errormessage = errstr;
 218         resp->response.dn = NULL;
 219         resp->response.referral = NULL;
 220         resp->SASL.secblob = NULL;
 221
 222         ldapsrv_queue_reply(call, reply);
 223         return NT_STATUS_OK;
 224 }
 225
 226 static void ldapsrv_BindSimple_done(struct tevent_req *subreq)
 227 {
 228         struct ldapsrv_call *call =
 229                 tevent_req_callback_data(subreq,
 230                 struct ldapsrv_call);
 231         struct ldapsrv_bind_wait_context *bind_wait =
 232                 talloc_get_type_abort(call->wait_private,
 233                 struct ldapsrv_bind_wait_context);
 234         struct ldapsrv_reply *reply = bind_wait->reply;
 235         struct auth_session_info *session_info = NULL;
 236         NTSTATUS status;
 237         struct ldap_BindResponse *resp = NULL;
 238         int result;
 239         const char *errstr = NULL;
 240
 241         status = authenticate_ldap_simple_bind_recv(subreq,
 242                                                     call,
 243                                                     &session_info);
 244         if (NT_STATUS_IS_OK(status)) {
 245                 char *ldb_errstring = NULL;
 246                 result = LDAP_SUCCESS;
 247                 errstr = NULL;
 248
 249                 talloc_unlink(call->conn, call->conn->session_info);
 250                 call->conn->session_info = talloc_steal(call->conn, session_info);
 251
 252                 call->conn->authz_logged = true;
 253
 254                 /* don't leak the old LDB */
 255                 talloc_unlink(call->conn, call->conn->ldb);
 256
 257                 result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
 258
 259                 if (result != LDB_SUCCESS) {
 260                         /* Only put the detailed error in DEBUG() */
 261                         DBG_ERR("ldapsrv_backend_Init failed: %s: %s\n",
 262                                 ldb_errstring, ldb_strerror(result));
 263                         errstr = talloc_strdup(reply,
 264                                                "Simple Bind: Failed to advise "
 265                                                "ldb new credentials");
 266                         result = LDB_ERR_OPERATIONS_ERROR;
 267                 }
 268         } else {
 269                 status = nt_status_squash(status);
 270
 271                 result = LDAP_INVALID_CREDENTIALS;
 272                 errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_INVALID_TOKEN,
 273                                                 0x0C0903A9, status);
 274         }
 275
 276         resp = &reply->msg->r.BindResponse;
 277         resp->response.resultcode = result;
 278         resp->response.errormessage = errstr;
 279         resp->response.dn = NULL;
 280         resp->response.referral = NULL;
 281         resp->SASL.secblob = NULL;
 282
 283         ldapsrv_queue_reply(call, reply);
 284         ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
 285 }
 286
 287 struct ldapsrv_sasl_postprocess_context {
 288         struct ldapsrv_connection *conn;
 289         struct tstream_context *sasl;
 290 };
 291
 292 struct ldapsrv_sasl_postprocess_state {
 293         uint8_t dummy;
 294 };
 295
 296 static struct tevent_req *ldapsrv_sasl_postprocess_send(TALLOC_CTX *mem_ctx,
 297                                                 struct tevent_context *ev,
 298                                                 void *private_data)
 299 {
 300         struct ldapsrv_sasl_postprocess_context *context =
 301                 talloc_get_type_abort(private_data,
 302                 struct ldapsrv_sasl_postprocess_context);
 303         struct tevent_req *req;
 304         struct ldapsrv_sasl_postprocess_state *state;
 305
 306         req = tevent_req_create(mem_ctx, &state,
 307                                 struct ldapsrv_sasl_postprocess_state);
 308         if (req == NULL) {
 309                 return NULL;
 310         }
 311
 312         TALLOC_FREE(context->conn->sockets.sasl);
 313         context->conn->sockets.sasl = talloc_move(context->conn, &context->sasl);
 314         context->conn->sockets.active = context->conn->sockets.sasl;
 315
 316         tevent_req_done(req);
 317         return tevent_req_post(req, ev);
 318 }
 319
 320 static NTSTATUS ldapsrv_sasl_postprocess_recv(struct tevent_req *req)
 321 {
 322         return tevent_req_simple_recv_ntstatus(req);
 323 }
 324
 325 static NTSTATUS ldapsrv_setup_gensec(struct ldapsrv_connection *conn,
 326                                      const char *sasl_mech,
 327                                      struct gensec_security **_gensec_security)
 328 {
 329         NTSTATUS status;
 330
 331         struct gensec_security *gensec_security;
 332
 333         status = samba_server_gensec_start(conn,
 334                                            conn->connection->event.ctx,
 335                                            conn->connection->msg_ctx,
 336                                            conn->lp_ctx,
 337                                            conn->server_credentials,
 338                                            "ldap",
 339                                            &gensec_security);
 340         if (!NT_STATUS_IS_OK(status)) {
 341                 return status;
 342         }
 343
 344         status = gensec_set_target_service_description(gensec_security,
 345                                                        "LDAP");
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 return status;
 348         }
 349
 350         status = gensec_set_remote_address(gensec_security,
 351                                            conn->connection->remote_address);
 352         if (!NT_STATUS_IS_OK(status)) {
 353                 return status;
 354         }
 355
 356         status = gensec_set_local_address(gensec_security,
 357                                           conn->connection->local_address);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 return status;
 360         }
 361
 362         gensec_want_feature(gensec_security, GENSEC_FEATURE_ASYNC_REPLIES);
 363         gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAP_STYLE);
 364
 365         if (conn->sockets.active == conn->sockets.tls) {
 366                 uint32_t initiator_addrtype = 0;
 367                 const DATA_BLOB *initiator_address = NULL;
 368                 uint32_t acceptor_addrtype = 0;
 369                 const DATA_BLOB *acceptor_address = NULL;
 370                 const DATA_BLOB *application_data =
 371                         tstream_tls_channel_bindings(conn->sockets.tls);
 372
 373                 status = gensec_set_channel_bindings(gensec_security,
 374                                                      initiator_addrtype,
 375                                                      initiator_address,
 376                                                      acceptor_addrtype,
 377                                                      acceptor_address,
 378                                                      application_data);
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         return status;
 381                 }
 382
 383                 /*
 384                  * By default channel bindings are required,
 385                  * so we only set GENSEC_FEATURE_CB_OPTIONAL
 386                  * for the legacy option:
 387                  *
 388                  * ldap server require strong auth = no
 389                  * or
 390                  * ldap server require strong auth =
 391                  *    allow_sasl_without_tls_channel_bindings
 392                  *
 393                  * And this as an alias to cope with existing smb.conf
 394                  * files:
 395                  *
 396                  * ldap server require strong auth = allow_sasl_over_tls
 397                  */
 398                 switch (conn->require_strong_auth) {
 399                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
 400                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
 401                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_WITHOUT_TLS_CB:
 402                         gensec_want_feature(gensec_security,
 403                                             GENSEC_FEATURE_CB_OPTIONAL);
 404                         break;
 405                 default:
 406                         break;
 407                 }
 408
 409                 gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAPS_TRANSPORT);
 410         }
 411
 412         status = gensec_start_mech_by_sasl_name(gensec_security, sasl_mech);
 413
 414         if (!NT_STATUS_IS_OK(status)) {
 415                 return status;
 416         }
 417
 418         *_gensec_security = gensec_security;
 419         return status;
 420 }
 421
 422 static void ldapsrv_BindSASL_done(struct tevent_req *subreq);
 423
 424 static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
 425 {
 426         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 427         struct ldapsrv_reply *reply;
 428         struct ldap_BindResponse *resp;
 429         struct ldapsrv_connection *conn;
 430         int result = 0;
 431         const char *errstr=NULL;
 432         NTSTATUS status = NT_STATUS_OK;
 433         DATA_BLOB input = data_blob_null;
 434         struct tevent_req *subreq = NULL;
 435
 436         DEBUG(10, ("BindSASL dn: %s\n",req->dn));
 437
 438         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 439         if (!reply) {
 440                 return NT_STATUS_NO_MEMORY;
 441         }
 442         resp = &reply->msg->r.BindResponse;
 443         /* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
 444         resp->SASL.secblob = talloc_zero(reply, DATA_BLOB);
 445         if (resp->SASL.secblob == NULL) {
 446                 return NT_STATUS_NO_MEMORY;
 447         }
 448
 449         conn = call->conn;
 450
 451         /*
 452          * TODO: a SASL bind with a different mechanism
 453          *       should cancel an inprogress SASL bind.
 454          *       (see RFC 4513)
 455          */
 456
 457         if (!conn->gensec) {
 458                 status = ldapsrv_setup_gensec(conn, req->creds.SASL.mechanism,
 459                                               &conn->gensec);
 460                 if (!NT_STATUS_IS_OK(status)) {
 461                         DEBUG(1, ("Failed to start GENSEC server for [%s] code: %s\n",
 462                                   ldb_binary_encode_string(call, req->creds.SASL.mechanism),
 463                                   nt_errstr(status)));
 464                         result = LDAP_OPERATIONS_ERROR;
 465                         errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s",
 466                                                  nt_errstr(status));
 467                         goto do_reply;
 468                 }
 469         }
 470
 471         if (req->creds.SASL.secblob) {
 472                 input = *req->creds.SASL.secblob;
 473         }
 474
 475         subreq = gensec_update_send(call, conn->connection->event.ctx,
 476                                     conn->gensec, input);
 477         if (subreq == NULL) {
 478                 return NT_STATUS_NO_MEMORY;
 479         }
 480         tevent_req_set_callback(subreq, ldapsrv_BindSASL_done, call);
 481
 482         status = ldapsrv_bind_wait_setup(call, reply);
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 TALLOC_FREE(subreq);
 485                 return status;
 486         }
 487
 488         /*
 489          * The rest will be async.
 490          */
 491         return NT_STATUS_OK;
 492
 493 do_reply:
 494         if (result != LDAP_SASL_BIND_IN_PROGRESS) {
 495                 /*
 496                  * We should destroy the gensec context
 497                  * when we hit a fatal error.
 498                  *
 499                  * Note: conn->gensec is already cleared
 500                  * for the LDAP_SUCCESS case.
 501                  */
 502                 talloc_unlink(conn, conn->gensec);
 503                 conn->gensec = NULL;
 504         }
 505
 506         resp->response.resultcode = result;
 507         resp->response.dn = NULL;
 508         resp->response.errormessage = errstr;
 509         resp->response.referral = NULL;
 510
 511         ldapsrv_queue_reply(call, reply);
 512         return NT_STATUS_OK;
 513 }
 514
 515 static void ldapsrv_BindSASL_done(struct tevent_req *subreq)
 516 {
 517         struct ldapsrv_call *call =
 518                 tevent_req_callback_data(subreq,
 519                 struct ldapsrv_call);
 520         struct ldapsrv_bind_wait_context *bind_wait =
 521                 talloc_get_type_abort(call->wait_private,
 522                 struct ldapsrv_bind_wait_context);
 523         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 524         struct ldapsrv_reply *reply = bind_wait->reply;
 525         struct ldap_BindResponse *resp = &reply->msg->r.BindResponse;
 526         struct ldapsrv_connection *conn = call->conn;
 527         struct auth_session_info *session_info = NULL;
 528         struct ldapsrv_sasl_postprocess_context *context = NULL;
 529         NTSTATUS status;
 530         int result;
 531         const char *errstr = NULL;
 532         char *ldb_errstring = NULL;
 533         DATA_BLOB output = data_blob_null;
 534         NTTIME expire_time_nt;
 535
 536         status = gensec_update_recv(subreq, call, &output);
 537         TALLOC_FREE(subreq);
 538
 539         if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
 540                 *resp->SASL.secblob = output;
 541                 result = LDAP_SASL_BIND_IN_PROGRESS;
 542                 errstr = NULL;
 543                 goto do_reply;
 544         }
 545
 546         if (NT_STATUS_EQUAL(status, NT_STATUS_BAD_BINDINGS)) {
 547                 result = LDAP_INVALID_CREDENTIALS;
 548                 errstr = ldapsrv_bind_error_msg(reply,
 549                                                 HRES_SEC_E_BAD_BINDINGS,
 550                                                 0x0C090711,
 551                                                 status);
 552                 goto do_reply;
 553         }
 554         if (!NT_STATUS_IS_OK(status)) {
 555                 status = nt_status_squash(status);
 556                 result = LDAP_INVALID_CREDENTIALS;
 557                 errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_LOGON_DENIED,
 558                                                 0x0C0904DC, status);
 559                 goto do_reply;
 560         }
 561
 562         if (gensec_have_feature(conn->gensec, GENSEC_FEATURE_SIGN) ||
 563             gensec_have_feature(conn->gensec, GENSEC_FEATURE_SEAL)) {
 564
 565                 context = talloc_zero(call, struct ldapsrv_sasl_postprocess_context);
 566                 if (context == NULL) {
 567                         ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
 568                         return;
 569                 }
 570         }
 571
 572         if (context && conn->sockets.tls) {
 573                 TALLOC_FREE(context);
 574                 status = NT_STATUS_NOT_SUPPORTED;
 575                 result = LDAP_UNWILLING_TO_PERFORM;
 576                 errstr = talloc_asprintf(reply,
 577                                          "SASL:[%s]: Sign or Seal are not allowed if TLS is used",
 578                                          req->creds.SASL.mechanism);
 579                 goto do_reply;
 580         }
 581
 582         if (context && conn->sockets.sasl) {
 583                 TALLOC_FREE(context);
 584                 status = NT_STATUS_NOT_SUPPORTED;
 585                 result = LDAP_UNWILLING_TO_PERFORM;
 586                 errstr = talloc_asprintf(reply,
 587                                          "SASL:[%s]: Sign or Seal are not allowed if SASL encryption has already been set up",
 588                                          req->creds.SASL.mechanism);
 589                 goto do_reply;
 590         }
 591
 592         if (context == NULL) {
 593                 switch (call->conn->require_strong_auth) {
 594                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
 595                         break;
 596                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
 597                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_WITHOUT_TLS_CB:
 598                 case LDAP_SERVER_REQUIRE_STRONG_AUTH_YES:
 599                         if (call->conn->sockets.active == call->conn->sockets.tls) {
 600                                 break;
 601                         }
 602                         status = NT_STATUS_NETWORK_ACCESS_DENIED;
 603                         result = LDAP_STRONG_AUTH_REQUIRED;
 604                         errstr = talloc_asprintf(reply,
 605                                          "SASL:[%s]: Sign or Seal are required.",
 606                                          req->creds.SASL.mechanism);
 607                         goto do_reply;
 608                 }
 609         }
 610
 611         if (context != NULL) {
 612                 context->conn = conn;
 613                 status = gensec_create_tstream(context,
 614                                                context->conn->gensec,
 615                                                context->conn->sockets.raw,
 616                                                &context->sasl);
 617                 if (!NT_STATUS_IS_OK(status)) {
 618                         result = LDAP_OPERATIONS_ERROR;
 619                         errstr = talloc_asprintf(reply,
 620                                          "SASL:[%s]: Failed to setup SASL socket: %s",
 621                                          req->creds.SASL.mechanism, nt_errstr(status));
 622                         goto do_reply;
 623                 }
 624         }
 625
 626         status = gensec_session_info(conn->gensec, call, &session_info);
 627         if (!NT_STATUS_IS_OK(status)) {
 628                 result = LDAP_OPERATIONS_ERROR;
 629                 errstr = talloc_asprintf(reply,
 630                                          "SASL:[%s]: Failed to get session info: %s",
 631                                          req->creds.SASL.mechanism, nt_errstr(status));
 632                 goto do_reply;
 633         }
 634
 635         talloc_unlink(conn, conn->session_info);
 636         conn->session_info = talloc_steal(conn, session_info);
 637
 638         /* don't leak the old LDB */
 639         talloc_unlink(conn, conn->ldb);
 640
 641         call->conn->authz_logged = true;
 642
 643         result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
 644
 645         if (result != LDB_SUCCESS) {
 646                 /* Only put the detailed error in DEBUG() */
 647                 DBG_ERR("ldapsrv_backend_Init failed: %s: %s\n",
 648                         ldb_errstring, ldb_strerror(result));
 649                 errstr = talloc_strdup(reply,
 650                                        "SASL Bind: Failed to advise "
 651                                        "ldb new credentials");
 652                 result = LDB_ERR_OPERATIONS_ERROR;
 653                 goto do_reply;
 654         }
 655
 656         expire_time_nt = gensec_expire_time(conn->gensec);
 657         if (expire_time_nt != GENSEC_EXPIRE_TIME_INFINITY) {
 658                 struct timeval_buf buf;
 659
 660                 nttime_to_timeval(&conn->limits.expire_time, expire_time_nt);
 661
 662                 DBG_DEBUG("Setting connection expire_time to %s\n",
 663                           timeval_str_buf(&conn->limits.expire_time,
 664                                           false,
 665                                           true,
 666                                           &buf));
 667         }
 668
 669         if (context != NULL) {
 670                 const void *ptr = NULL;
 671
 672                 ptr = talloc_reparent(conn, context->sasl, conn->gensec);
 673                 if (ptr == NULL) {
 674                         ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
 675                         return;
 676                 }
 677
 678                 call->postprocess_send = ldapsrv_sasl_postprocess_send;
 679                 call->postprocess_recv = ldapsrv_sasl_postprocess_recv;
 680                 call->postprocess_private = context;
 681         } else {
 682                 talloc_unlink(conn, conn->gensec);
 683         }
 684         conn->gensec = NULL;
 685
 686         *resp->SASL.secblob = output;
 687         result = LDAP_SUCCESS;
 688         errstr = NULL;
 689
 690 do_reply:
 691         if (result != LDAP_SASL_BIND_IN_PROGRESS) {
 692                 /*
 693                  * We should destroy the gensec context
 694                  * when we hit a fatal error.
 695                  *
 696                  * Note: conn->gensec is already cleared
 697                  * for the LDAP_SUCCESS case.
 698                  */
 699                 talloc_unlink(conn, conn->gensec);
 700                 conn->gensec = NULL;
 701         }
 702
 703         resp->response.resultcode = result;
 704         resp->response.dn = NULL;
 705         resp->response.errormessage = errstr;
 706         resp->response.referral = NULL;
 707
 708         ldapsrv_queue_reply(call, reply);
 709         ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
 710 }
 711
 712 NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
 713 {
 714         struct ldap_BindRequest *req = &call->request->r.BindRequest;
 715         struct ldapsrv_reply *reply;
 716         struct ldap_BindResponse *resp;
 717
 718         if (call->conn->pending_calls != NULL) {
 719                 reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 720                 if (!reply) {
 721                         return NT_STATUS_NO_MEMORY;
 722                 }
 723
 724                 resp = &reply->msg->r.BindResponse;
 725                 resp->response.resultcode = LDAP_BUSY;
 726                 resp->response.dn = NULL;
 727                 resp->response.errormessage = talloc_asprintf(reply, "Pending requests on this LDAP session");
 728                 resp->response.referral = NULL;
 729                 resp->SASL.secblob = NULL;
 730
 731                 ldapsrv_queue_reply(call, reply);
 732                 return NT_STATUS_OK;
 733         }
 734
 735         /*
 736          * TODO: a simple bind should cancel an
 737          *       inprogress SASL bind.
 738          *       (see RFC 4513)
 739          */
 740         switch (req->mechanism) {
 741                 case LDAP_AUTH_MECH_SIMPLE:
 742                         return ldapsrv_BindSimple(call);
 743                 case LDAP_AUTH_MECH_SASL:
 744                         return ldapsrv_BindSASL(call);
 745         }
 746
 747         reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
 748         if (!reply) {
 749                 return NT_STATUS_NO_MEMORY;
 750         }
 751
 752         resp = &reply->msg->r.BindResponse;
 753         resp->response.resultcode = LDAP_AUTH_METHOD_NOT_SUPPORTED;
 754         resp->response.dn = NULL;
 755         resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
 756         resp->response.referral = NULL;
 757         resp->SASL.secblob = NULL;
 758
 759         ldapsrv_queue_reply(call, reply);
 760         return NT_STATUS_OK;
 761 }
 762
 763 struct ldapsrv_unbind_wait_context {
 764         uint8_t dummy;
 765 };
 766
 767 struct ldapsrv_unbind_wait_state {
 768         uint8_t dummy;
 769 };
 770
 771 static struct tevent_req *ldapsrv_unbind_wait_send(TALLOC_CTX *mem_ctx,
 772                                                  struct tevent_context *ev,
 773                                                  void *private_data)
 774 {
 775         struct ldapsrv_unbind_wait_context *unbind_wait =
 776                 talloc_get_type_abort(private_data,
 777                 struct ldapsrv_unbind_wait_context);
 778         struct tevent_req *req;
 779         struct ldapsrv_unbind_wait_state *state;
 780
 781         req = tevent_req_create(mem_ctx, &state,
 782                                 struct ldapsrv_unbind_wait_state);
 783         if (req == NULL) {
 784                 return NULL;
 785         }
 786
 787         (void)unbind_wait;
 788
 789         tevent_req_nterror(req, NT_STATUS_LOCAL_DISCONNECT);
 790         return tevent_req_post(req, ev);
 791 }
 792
 793 static NTSTATUS ldapsrv_unbind_wait_recv(struct tevent_req *req)
 794 {
 795         return tevent_req_simple_recv_ntstatus(req);
 796 }
 797
 798 static NTSTATUS ldapsrv_unbind_wait_setup(struct ldapsrv_call *call)
 799 {
 800         struct ldapsrv_unbind_wait_context *unbind_wait = NULL;
 801
 802         if (call->wait_private != NULL) {
 803                 return NT_STATUS_INTERNAL_ERROR;
 804         }
 805
 806         unbind_wait = talloc_zero(call, struct ldapsrv_unbind_wait_context);
 807         if (unbind_wait == NULL) {
 808                 return NT_STATUS_NO_MEMORY;
 809         }
 810
 811         call->wait_private = unbind_wait;
 812         call->wait_send = ldapsrv_unbind_wait_send;
 813         call->wait_recv = ldapsrv_unbind_wait_recv;
 814         return NT_STATUS_OK;
 815 }
 816
 817 NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
 818 {
 819         struct ldapsrv_call *c = NULL;
 820         struct ldapsrv_call *n = NULL;
 821
 822         DEBUG(10, ("UnbindRequest\n"));
 823
 824         for (c = call->conn->pending_calls; c != NULL; c = n) {
 825                 n = c->next;
 826
 827                 DLIST_REMOVE(call->conn->pending_calls, c);
 828                 TALLOC_FREE(c);
 829         }
 830
 831         return ldapsrv_unbind_wait_setup(call);
 832 }