Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 783 insertions, 0 deletions

diff --git a/source4/ldap_server/ldap_bind.c b/source4/ldap_server/ldap_bind.c
new file mode 100644
index 0000000..b60dc71
--- /dev/null
+++ b/source4/ldap_server/ldap_bind.c
@@ -0,0 +1,783 @@
+/* 
+   Unix SMB/CIFS implementation.
+   LDAP server
+   Copyright (C) Stefan Metzmacher 2004
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "ldap_server/ldap_server.h"
+#include "auth/auth.h"
+#include "samba/service.h"
+#include <ldb.h>
+#include <ldb_errors.h>
+#include "../lib/util/dlinklist.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_tstream.h"
+#include "param/param.h"
+#include "../lib/util/tevent_ntstatus.h"
+#include "lib/util/time_basic.h"
+
+static char *ldapsrv_bind_error_msg(TALLOC_CTX *mem_ctx,
+				    HRESULT hresult,
+				    uint32_t DSID,
+				    NTSTATUS status)
+{
+	WERROR werr;
+	char *msg = NULL;
+
+	status = nt_status_squash(status);
+	werr = ntstatus_to_werror(status);
+
+	/*
+	 * There are 4 lower case hex digits following 'v' at the end,
+	 * but different Windows Versions return different values:
+	 *
+	 * Windows 2008R2 uses 'v1db1'
+	 * Windows 2012R2 uses 'v2580'
+	 *
+	 * We just match Windows 2008R2 as that's what was referenced
+	 * in https://bugzilla.samba.org/show_bug.cgi?id=9048
+	 */
+	msg = talloc_asprintf(mem_ctx, "%08X: LdapErr: DSID-%08X, comment: "
+			      "AcceptSecurityContext error, data %x, v1db1",
+			      (unsigned)HRES_ERROR_V(hresult),
+			      (unsigned)DSID,
+			      (unsigned)W_ERROR_V(werr));
+
+	return msg;
+}
+
+struct ldapsrv_bind_wait_context {
+	struct ldapsrv_reply *reply;
+	struct tevent_req *req;
+	NTSTATUS status;
+	bool done;
+};
+
+struct ldapsrv_bind_wait_state {
+	uint8_t dummy;
+};
+
+static struct tevent_req *ldapsrv_bind_wait_send(TALLOC_CTX *mem_ctx,
+						 struct tevent_context *ev,
+						 void *private_data)
+{
+	struct ldapsrv_bind_wait_context *bind_wait =
+		talloc_get_type_abort(private_data,
+		struct ldapsrv_bind_wait_context);
+	struct tevent_req *req;
+	struct ldapsrv_bind_wait_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ldapsrv_bind_wait_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	bind_wait->req = req;
+
+	tevent_req_defer_callback(req, ev);
+
+	if (!bind_wait->done) {
+		return req;
+	}
+
+	if (tevent_req_nterror(req, bind_wait->status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static NTSTATUS ldapsrv_bind_wait_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}
+
+static NTSTATUS ldapsrv_bind_wait_setup(struct ldapsrv_call *call,
+					struct ldapsrv_reply *reply)
+{
+	struct ldapsrv_bind_wait_context *bind_wait = NULL;
+
+	if (call->wait_private != NULL) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	bind_wait = talloc_zero(call, struct ldapsrv_bind_wait_context);
+	if (bind_wait == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	bind_wait->reply = reply;
+
+	call->wait_private = bind_wait;
+	call->wait_send = ldapsrv_bind_wait_send;
+	call->wait_recv = ldapsrv_bind_wait_recv;
+	return NT_STATUS_OK;
+}
+
+static void ldapsrv_bind_wait_finished(struct ldapsrv_call *call,
+				       NTSTATUS status)
+{
+	struct ldapsrv_bind_wait_context *bind_wait =
+		talloc_get_type_abort(call->wait_private,
+		struct ldapsrv_bind_wait_context);
+
+	bind_wait->done = true;
+	bind_wait->status = status;
+
+	if (bind_wait->req == NULL) {
+		return;
+	}
+
+	if (tevent_req_nterror(bind_wait->req, status)) {
+		return;
+	}
+
+	tevent_req_done(bind_wait->req);
+}
+
+static void ldapsrv_BindSimple_done(struct tevent_req *subreq);
+
+static NTSTATUS ldapsrv_BindSimple(struct ldapsrv_call *call)
+{
+	struct ldap_BindRequest *req = &call->request->r.BindRequest;
+	struct ldapsrv_reply *reply = NULL;
+	struct ldap_BindResponse *resp = NULL;
+	int result;
+	const char *errstr = NULL;
+	NTSTATUS status;
+	bool using_tls = call->conn->sockets.active == call->conn->sockets.tls;
+	struct tevent_req *subreq = NULL;
+
+	DEBUG(10, ("BindSimple dn: %s\n",req->dn));
+
+	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+	if (!reply) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (req->dn != NULL &&
+	    strlen(req->dn) != 0 &&
+	    call->conn->require_strong_auth > LDAP_SERVER_REQUIRE_STRONG_AUTH_NO &&
+	    !using_tls)
+	{
+		status = NT_STATUS_NETWORK_ACCESS_DENIED;
+		result = LDAP_STRONG_AUTH_REQUIRED;
+		errstr = talloc_asprintf(reply,
+					 "BindSimple: Transport encryption required.");
+		goto do_reply;
+	}
+
+	subreq = authenticate_ldap_simple_bind_send(call,
+					call->conn->connection->event.ctx,
+					call->conn->connection->msg_ctx,
+					call->conn->lp_ctx,
+					call->conn->connection->remote_address,
+					call->conn->connection->local_address,
+					using_tls,
+					req->dn,
+					req->creds.password);
+	if (subreq == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	tevent_req_set_callback(subreq, ldapsrv_BindSimple_done, call);
+
+	status = ldapsrv_bind_wait_setup(call, reply);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(subreq);
+		return status;
+	}
+
+	/*
+	 * The rest will be async.
+	 */
+	return NT_STATUS_OK;
+
+do_reply:
+	resp = &reply->msg->r.BindResponse;
+	resp->response.resultcode = result;
+	resp->response.errormessage = errstr;
+	resp->response.dn = NULL;
+	resp->response.referral = NULL;
+	resp->SASL.secblob = NULL;
+
+	ldapsrv_queue_reply(call, reply);
+	return NT_STATUS_OK;
+}
+
+static void ldapsrv_BindSimple_done(struct tevent_req *subreq)
+{
+	struct ldapsrv_call *call =
+		tevent_req_callback_data(subreq,
+		struct ldapsrv_call);
+	struct ldapsrv_bind_wait_context *bind_wait =
+		talloc_get_type_abort(call->wait_private,
+		struct ldapsrv_bind_wait_context);
+	struct ldapsrv_reply *reply = bind_wait->reply;
+	struct auth_session_info *session_info = NULL;
+	NTSTATUS status;
+	struct ldap_BindResponse *resp = NULL;
+	int result;
+	const char *errstr = NULL;
+
+	status = authenticate_ldap_simple_bind_recv(subreq,
+						    call,
+						    &session_info);
+	if (NT_STATUS_IS_OK(status)) {
+		char *ldb_errstring = NULL;
+		result = LDAP_SUCCESS;
+		errstr = NULL;
+
+		talloc_unlink(call->conn, call->conn->session_info);
+		call->conn->session_info = talloc_steal(call->conn, session_info);
+
+		call->conn->authz_logged = true;
+
+		/* don't leak the old LDB */
+		talloc_unlink(call->conn, call->conn->ldb);
+
+		result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
+
+		if (result != LDB_SUCCESS) {
+			/* Only put the detailed error in DEBUG() */
+			DBG_ERR("ldapsrv_backend_Init failed: %s: %s",
+				ldb_errstring, ldb_strerror(result));
+			errstr = talloc_strdup(reply,
+					       "Simple Bind: Failed to advise "
+					       "ldb new credentials");
+			result = LDB_ERR_OPERATIONS_ERROR;
+		}
+	} else {
+		status = nt_status_squash(status);
+
+		result = LDAP_INVALID_CREDENTIALS;
+		errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_INVALID_TOKEN,
+						0x0C0903A9, status);
+	}
+
+	resp = &reply->msg->r.BindResponse;
+	resp->response.resultcode = result;
+	resp->response.errormessage = errstr;
+	resp->response.dn = NULL;
+	resp->response.referral = NULL;
+	resp->SASL.secblob = NULL;
+
+	ldapsrv_queue_reply(call, reply);
+	ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
+}
+
+struct ldapsrv_sasl_postprocess_context {
+	struct ldapsrv_connection *conn;
+	struct tstream_context *sasl;
+};
+
+struct ldapsrv_sasl_postprocess_state {
+	uint8_t dummy;
+};
+
+static struct tevent_req *ldapsrv_sasl_postprocess_send(TALLOC_CTX *mem_ctx,
+						struct tevent_context *ev,
+						void *private_data)
+{
+	struct ldapsrv_sasl_postprocess_context *context =
+		talloc_get_type_abort(private_data,
+		struct ldapsrv_sasl_postprocess_context);
+	struct tevent_req *req;
+	struct ldapsrv_sasl_postprocess_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ldapsrv_sasl_postprocess_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	TALLOC_FREE(context->conn->sockets.sasl);
+	context->conn->sockets.sasl = talloc_move(context->conn, &context->sasl);
+	context->conn->sockets.active = context->conn->sockets.sasl;
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static NTSTATUS ldapsrv_sasl_postprocess_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}
+
+static NTSTATUS ldapsrv_setup_gensec(struct ldapsrv_connection *conn,
+				     const char *sasl_mech,
+				     struct gensec_security **_gensec_security)
+{
+	NTSTATUS status;
+
+	struct gensec_security *gensec_security;
+
+	status = samba_server_gensec_start(conn,
+					   conn->connection->event.ctx,
+					   conn->connection->msg_ctx,
+					   conn->lp_ctx,
+					   conn->server_credentials,
+					   "ldap",
+					   &gensec_security);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = gensec_set_target_service_description(gensec_security,
+						       "LDAP");
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = gensec_set_remote_address(gensec_security,
+					   conn->connection->remote_address);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = gensec_set_local_address(gensec_security,
+					  conn->connection->local_address);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	gensec_want_feature(gensec_security, GENSEC_FEATURE_ASYNC_REPLIES);
+	gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAP_STYLE);
+
+	if (conn->sockets.active == conn->sockets.tls) {
+		gensec_want_feature(gensec_security, GENSEC_FEATURE_LDAPS_TRANSPORT);
+	}
+
+	status = gensec_start_mech_by_sasl_name(gensec_security, sasl_mech);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	*_gensec_security = gensec_security;
+	return status;
+}
+
+static void ldapsrv_BindSASL_done(struct tevent_req *subreq);
+
+static NTSTATUS ldapsrv_BindSASL(struct ldapsrv_call *call)
+{
+	struct ldap_BindRequest *req = &call->request->r.BindRequest;
+	struct ldapsrv_reply *reply;
+	struct ldap_BindResponse *resp;
+	struct ldapsrv_connection *conn;
+	int result = 0;
+	const char *errstr=NULL;
+	NTSTATUS status = NT_STATUS_OK;
+	DATA_BLOB input = data_blob_null;
+	struct tevent_req *subreq = NULL;
+
+	DEBUG(10, ("BindSASL dn: %s\n",req->dn));
+
+	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+	if (!reply) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	resp = &reply->msg->r.BindResponse;
+	/* Windows 2000 mmc doesn't like secblob == NULL and reports a decoding error */
+	resp->SASL.secblob = talloc_zero(reply, DATA_BLOB);
+	if (resp->SASL.secblob == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	conn = call->conn;
+
+	/* 
+	 * TODO: a SASL bind with a different mechanism
+	 *       should cancel an inprogress SASL bind.
+	 *       (see RFC 4513)
+	 */
+
+	if (!conn->gensec) {
+		status = ldapsrv_setup_gensec(conn, req->creds.SASL.mechanism,
+					      &conn->gensec);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to start GENSEC server for [%s] code: %s\n",
+				  ldb_binary_encode_string(call, req->creds.SASL.mechanism),
+				  nt_errstr(status)));
+			result = LDAP_OPERATIONS_ERROR;
+			errstr = talloc_asprintf(reply, "SASL: Failed to start authentication system: %s", 
+						 nt_errstr(status));
+			goto do_reply;
+		}
+	}
+
+	if (req->creds.SASL.secblob) {
+		input = *req->creds.SASL.secblob;
+	}
+
+	subreq = gensec_update_send(call, conn->connection->event.ctx,
+				    conn->gensec, input);
+	if (subreq == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	tevent_req_set_callback(subreq, ldapsrv_BindSASL_done, call);
+
+	status = ldapsrv_bind_wait_setup(call, reply);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(subreq);
+		return status;
+	}
+
+	/*
+	 * The rest will be async.
+	 */
+	return NT_STATUS_OK;
+
+do_reply:
+	if (result != LDAP_SASL_BIND_IN_PROGRESS) {
+		/*
+		 * We should destroy the gensec context
+		 * when we hit a fatal error.
+		 *
+		 * Note: conn->gensec is already cleared
+		 * for the LDAP_SUCCESS case.
+		 */
+		talloc_unlink(conn, conn->gensec);
+		conn->gensec = NULL;
+	}
+
+	resp->response.resultcode = result;
+	resp->response.dn = NULL;
+	resp->response.errormessage = errstr;
+	resp->response.referral = NULL;
+
+	ldapsrv_queue_reply(call, reply);
+	return NT_STATUS_OK;
+}
+
+static void ldapsrv_BindSASL_done(struct tevent_req *subreq)
+{
+	struct ldapsrv_call *call =
+		tevent_req_callback_data(subreq,
+		struct ldapsrv_call);
+	struct ldapsrv_bind_wait_context *bind_wait =
+		talloc_get_type_abort(call->wait_private,
+		struct ldapsrv_bind_wait_context);
+	struct ldap_BindRequest *req = &call->request->r.BindRequest;
+	struct ldapsrv_reply *reply = bind_wait->reply;
+	struct ldap_BindResponse *resp = &reply->msg->r.BindResponse;
+	struct ldapsrv_connection *conn = call->conn;
+	struct auth_session_info *session_info = NULL;
+	struct ldapsrv_sasl_postprocess_context *context = NULL;
+	NTSTATUS status;
+	int result;
+	const char *errstr = NULL;
+	char *ldb_errstring = NULL;
+	DATA_BLOB output = data_blob_null;
+	NTTIME expire_time_nt;
+
+	status = gensec_update_recv(subreq, call, &output);
+	TALLOC_FREE(subreq);
+
+	if (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
+		*resp->SASL.secblob = output;
+		result = LDAP_SASL_BIND_IN_PROGRESS;
+		errstr = NULL;
+		goto do_reply;
+	}
+
+	if (!NT_STATUS_IS_OK(status)) {
+		status = nt_status_squash(status);
+		result = LDAP_INVALID_CREDENTIALS;
+		errstr = ldapsrv_bind_error_msg(reply, HRES_SEC_E_LOGON_DENIED,
+						0x0C0904DC, status);
+		goto do_reply;
+	}
+
+	if (gensec_have_feature(conn->gensec, GENSEC_FEATURE_SIGN) ||
+	    gensec_have_feature(conn->gensec, GENSEC_FEATURE_SEAL)) {
+
+		context = talloc_zero(call, struct ldapsrv_sasl_postprocess_context);
+		if (context == NULL) {
+			ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
+			return;
+		}
+	}
+
+	if (context && conn->sockets.tls) {
+		TALLOC_FREE(context);
+		status = NT_STATUS_NOT_SUPPORTED;
+		result = LDAP_UNWILLING_TO_PERFORM;
+		errstr = talloc_asprintf(reply,
+					 "SASL:[%s]: Sign or Seal are not allowed if TLS is used",
+					 req->creds.SASL.mechanism);
+		goto do_reply;
+	}
+
+	if (context && conn->sockets.sasl) {
+		TALLOC_FREE(context);
+		status = NT_STATUS_NOT_SUPPORTED;
+		result = LDAP_UNWILLING_TO_PERFORM;
+		errstr = talloc_asprintf(reply,
+					 "SASL:[%s]: Sign or Seal are not allowed if SASL encryption has already been set up",
+					 req->creds.SASL.mechanism);
+		goto do_reply;
+	}
+
+	if (context == NULL) {
+		switch (call->conn->require_strong_auth) {
+		case LDAP_SERVER_REQUIRE_STRONG_AUTH_NO:
+			break;
+		case LDAP_SERVER_REQUIRE_STRONG_AUTH_ALLOW_SASL_OVER_TLS:
+			if (call->conn->sockets.active == call->conn->sockets.tls) {
+				break;
+			}
+			status = NT_STATUS_NETWORK_ACCESS_DENIED;
+			result = LDAP_STRONG_AUTH_REQUIRED;
+			errstr = talloc_asprintf(reply,
+					"SASL:[%s]: not allowed if TLS is used.",
+					 req->creds.SASL.mechanism);
+			goto do_reply;
+
+		case LDAP_SERVER_REQUIRE_STRONG_AUTH_YES:
+			status = NT_STATUS_NETWORK_ACCESS_DENIED;
+			result = LDAP_STRONG_AUTH_REQUIRED;
+			errstr = talloc_asprintf(reply,
+					 "SASL:[%s]: Sign or Seal are required.",
+					 req->creds.SASL.mechanism);
+			goto do_reply;
+		}
+	}
+
+	if (context != NULL) {
+		context->conn = conn;
+		status = gensec_create_tstream(context,
+					       context->conn->gensec,
+					       context->conn->sockets.raw,
+					       &context->sasl);
+		if (!NT_STATUS_IS_OK(status)) {
+			result = LDAP_OPERATIONS_ERROR;
+			errstr = talloc_asprintf(reply,
+					 "SASL:[%s]: Failed to setup SASL socket: %s",
+					 req->creds.SASL.mechanism, nt_errstr(status));
+			goto do_reply;
+		}
+	}
+
+	status = gensec_session_info(conn->gensec, call, &session_info);
+	if (!NT_STATUS_IS_OK(status)) {
+		result = LDAP_OPERATIONS_ERROR;
+		errstr = talloc_asprintf(reply,
+					 "SASL:[%s]: Failed to get session info: %s",
+					 req->creds.SASL.mechanism, nt_errstr(status));
+		goto do_reply;
+	}
+
+	talloc_unlink(conn, conn->session_info);
+	conn->session_info = talloc_steal(conn, session_info);
+
+	/* don't leak the old LDB */
+	talloc_unlink(conn, conn->ldb);
+
+	call->conn->authz_logged = true;
+
+	result = ldapsrv_backend_Init(call->conn, &ldb_errstring);
+
+	if (result != LDB_SUCCESS) {
+		/* Only put the detailed error in DEBUG() */
+		DBG_ERR("ldapsrv_backend_Init failed: %s: %s",
+			ldb_errstring, ldb_strerror(result));
+		errstr = talloc_strdup(reply,
+				       "SASL Bind: Failed to advise "
+				       "ldb new credentials");
+		result = LDB_ERR_OPERATIONS_ERROR;
+		goto do_reply;
+	}
+
+	expire_time_nt = gensec_expire_time(conn->gensec);
+	if (expire_time_nt != GENSEC_EXPIRE_TIME_INFINITY) {
+		struct timeval_buf buf;
+
+		nttime_to_timeval(&conn->limits.expire_time, expire_time_nt);
+
+		DBG_DEBUG("Setting connection expire_time to %s\n",
+			  timeval_str_buf(&conn->limits.expire_time,
+					  false,
+					  true,
+					  &buf));
+	}
+
+	if (context != NULL) {
+		const void *ptr = NULL;
+
+		ptr = talloc_reparent(conn, context->sasl, conn->gensec);
+		if (ptr == NULL) {
+			ldapsrv_bind_wait_finished(call, NT_STATUS_NO_MEMORY);
+			return;
+		}
+
+		call->postprocess_send = ldapsrv_sasl_postprocess_send;
+		call->postprocess_recv = ldapsrv_sasl_postprocess_recv;
+		call->postprocess_private = context;
+	} else {
+		talloc_unlink(conn, conn->gensec);
+	}
+	conn->gensec = NULL;
+
+	*resp->SASL.secblob = output;
+	result = LDAP_SUCCESS;
+	errstr = NULL;
+
+do_reply:
+	if (result != LDAP_SASL_BIND_IN_PROGRESS) {
+		/*
+		 * We should destroy the gensec context
+		 * when we hit a fatal error.
+		 *
+		 * Note: conn->gensec is already cleared
+		 * for the LDAP_SUCCESS case.
+		 */
+		talloc_unlink(conn, conn->gensec);
+		conn->gensec = NULL;
+	}
+
+	resp->response.resultcode = result;
+	resp->response.dn = NULL;
+	resp->response.errormessage = errstr;
+	resp->response.referral = NULL;
+
+	ldapsrv_queue_reply(call, reply);
+	ldapsrv_bind_wait_finished(call, NT_STATUS_OK);
+}
+
+NTSTATUS ldapsrv_BindRequest(struct ldapsrv_call *call)
+{
+	struct ldap_BindRequest *req = &call->request->r.BindRequest;
+	struct ldapsrv_reply *reply;
+	struct ldap_BindResponse *resp;
+
+	if (call->conn->pending_calls != NULL) {
+		reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+		if (!reply) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		resp = &reply->msg->r.BindResponse;
+		resp->response.resultcode = LDAP_BUSY;
+		resp->response.dn = NULL;
+		resp->response.errormessage = talloc_asprintf(reply, "Pending requests on this LDAP session");
+		resp->response.referral = NULL;
+		resp->SASL.secblob = NULL;
+
+		ldapsrv_queue_reply(call, reply);
+		return NT_STATUS_OK;
+	}
+
+	/* 
+	 * TODO: a simple bind should cancel an
+	 *       inprogress SASL bind.
+	 *       (see RFC 4513)
+	 */
+	switch (req->mechanism) {
+		case LDAP_AUTH_MECH_SIMPLE:
+			return ldapsrv_BindSimple(call);
+		case LDAP_AUTH_MECH_SASL:
+			return ldapsrv_BindSASL(call);
+	}
+
+	reply = ldapsrv_init_reply(call, LDAP_TAG_BindResponse);
+	if (!reply) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	resp = &reply->msg->r.BindResponse;
+	resp->response.resultcode = LDAP_AUTH_METHOD_NOT_SUPPORTED;
+	resp->response.dn = NULL;
+	resp->response.errormessage = talloc_asprintf(reply, "Bad AuthenticationChoice [%d]", req->mechanism);
+	resp->response.referral = NULL;
+	resp->SASL.secblob = NULL;
+
+	ldapsrv_queue_reply(call, reply);
+	return NT_STATUS_OK;
+}
+
+struct ldapsrv_unbind_wait_context {
+	uint8_t dummy;
+};
+
+struct ldapsrv_unbind_wait_state {
+	uint8_t dummy;
+};
+
+static struct tevent_req *ldapsrv_unbind_wait_send(TALLOC_CTX *mem_ctx,
+						 struct tevent_context *ev,
+						 void *private_data)
+{
+	struct ldapsrv_unbind_wait_context *unbind_wait =
+		talloc_get_type_abort(private_data,
+		struct ldapsrv_unbind_wait_context);
+	struct tevent_req *req;
+	struct ldapsrv_unbind_wait_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ldapsrv_unbind_wait_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	(void)unbind_wait;
+
+	tevent_req_nterror(req, NT_STATUS_LOCAL_DISCONNECT);
+	return tevent_req_post(req, ev);
+}
+
+static NTSTATUS ldapsrv_unbind_wait_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}
+
+static NTSTATUS ldapsrv_unbind_wait_setup(struct ldapsrv_call *call)
+{
+	struct ldapsrv_unbind_wait_context *unbind_wait = NULL;
+
+	if (call->wait_private != NULL) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	unbind_wait = talloc_zero(call, struct ldapsrv_unbind_wait_context);
+	if (unbind_wait == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	call->wait_private = unbind_wait;
+	call->wait_send = ldapsrv_unbind_wait_send;
+	call->wait_recv = ldapsrv_unbind_wait_recv;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS ldapsrv_UnbindRequest(struct ldapsrv_call *call)
+{
+	struct ldapsrv_call *c = NULL;
+	struct ldapsrv_call *n = NULL;
+
+	DEBUG(10, ("UnbindRequest\n"));
+
+	for (c = call->conn->pending_calls; c != NULL; c = n) {
+		n = c->next;
+
+		DLIST_REMOVE(call->conn->pending_calls, c);
+		TALLOC_FREE(c);
+	}
+
+	return ldapsrv_unbind_wait_setup(call);
+}