Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream

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

1 files changed, 3204 insertions, 0 deletions

diff --git a/servers/slapd/back-ldap/bind.c b/servers/slapd/back-ldap/bind.c
new file mode 100644
index 0000000..2da66c4
--- /dev/null
+++ b/servers/slapd/back-ldap/bind.c
@@ -0,0 +1,3204 @@
+/* bind.c - ldap backend bind function */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1999-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2000-2003 Pierangelo Masarati.
+ * Portions Copyright 1999-2003 Howard Chu.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Howard Chu for inclusion
+ * in OpenLDAP Software and subsequently enhanced by Pierangelo
+ * Masarati.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/errno.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+
+#define AVL_INTERNAL
+#include "slap.h"
+#include "back-ldap.h"
+#include "lutil.h"
+#include "lutil_ldap.h"
+#include "ldap_rq.h"
+
+#define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ	"2.16.840.1.113730.3.4.12"
+
+#ifdef LDAP_DEVEL
+#define SLAP_AUTH_DN 1
+#endif
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+
+static const struct {
+	slap_mask_t	f;
+	char		c;
+} flagsmap[] = {
+	{ LDAP_BACK_FCONN_ISBOUND,	'B' },
+	{ LDAP_BACK_FCONN_ISANON,	'A' },
+	{ LDAP_BACK_FCONN_ISPRIV,	'P' },
+	{ LDAP_BACK_FCONN_ISTLS,	'T' },
+	{ LDAP_BACK_FCONN_BINDING,	'X' },
+	{ LDAP_BACK_FCONN_TAINTED,	'E' },
+	{ LDAP_BACK_FCONN_ABANDON,	'N' },
+	{ LDAP_BACK_FCONN_ISIDASR,	'S' },
+	{ LDAP_BACK_FCONN_CACHED,	'C' },
+	{ 0,				'\0' }
+};
+
+static void
+ldap_back_conn_print( ldapconn_t *lc )
+{
+	char buf[ SLAP_TEXT_BUFLEN ];
+	char fbuf[ sizeof("BAPTIENSC") ];
+	int i;
+
+	ldap_back_conn2str( &lc->lc_base, buf, sizeof( buf ) );
+	for ( i = 0; flagsmap[ i ].c != '\0'; i++ ) {
+		if ( lc->lc_lcflags & flagsmap[i].f ) {
+			fbuf[i] = flagsmap[i].c;
+
+		} else {
+			fbuf[i] = '.';
+		}
+	}
+	fbuf[i] = '\0';
+	
+	fprintf( stderr, "lc=%p %s flags=0x%08x (%s)\n",
+		(void *)lc, buf, lc->lc_lcflags, fbuf );
+}
+
+
+static char* priv2str[] = {
+	"privileged",
+	"privileged/TLS",
+	"anonymous",
+	"anonymous/TLS",
+	"bind",
+	"bind/TLS",
+	NULL
+};
+
+void
+ldap_back_print_conntree( ldapinfo_t *li, char *msg )
+{
+	int	c;
+
+	fprintf( stderr, "========> %s\n", msg );
+
+	for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
+		int		i = 0;
+		ldapconn_t	*lc;
+
+		fprintf( stderr, "  %s[%d]\n", priv2str[ c ], li->li_conn_priv[ c ].lic_num );
+
+		LDAP_TAILQ_FOREACH( lc, &li->li_conn_priv[ c ].lic_priv, lc_q )
+		{
+			fprintf( stderr, "    [%d] ", i );
+			ldap_back_conn_print( lc );
+			i++;
+		}
+	}
+	
+	if ( li->li_conninfo.lai_tree == 0 ) {
+		fprintf( stderr, "\t(empty)\n" );
+
+	} else {
+		TAvlnode *edge = ldap_tavl_end( li->li_conninfo.lai_tree, TAVL_DIR_LEFT );
+		while ( edge ) {
+			ldap_back_conn_print( (ldapconn_t *)edge->avl_data );
+			edge = ldap_tavl_next( edge, TAVL_DIR_RIGHT );
+		}
+	}
+	
+	fprintf( stderr, "<======== %s\n", msg );
+}
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+static int
+ldap_back_freeconn( ldapinfo_t *li, ldapconn_t *lc, int dolock );
+
+static ldapconn_t *
+ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
+	struct berval *binddn, struct berval *bindcred );
+
+static int
+ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
+	struct berval *binddn, struct berval *bindcred );
+
+static int
+ldap_back_proxy_authz_bind( ldapconn_t *lc, Operation *op, SlapReply *rs,
+	ldap_back_send_t sendok, struct berval *binddn, struct berval *bindcred );
+
+static int
+ldap_back_prepare_conn( ldapconn_t *lc, Operation *op, SlapReply *rs,
+	ldap_back_send_t sendok );
+
+static int
+ldap_back_conndnlc_cmp( const void *c1, const void *c2 );
+
+static void
+ldap_back_conn_prune( ldapinfo_t *li );
+
+static void
+ldap_back_schedule_conn_expiry( ldapinfo_t *li, ldapconn_t *lc );
+
+ldapconn_t *
+ldap_back_conn_delete( ldapinfo_t *li, ldapconn_t *lc )
+{
+	if ( LDAP_BACK_PCONN_ISPRIV( lc ) ) {
+		if ( LDAP_BACK_CONN_CACHED( lc ) ) {
+			assert( lc->lc_q.tqe_prev != NULL );
+			assert( li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num > 0 );
+			li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num--;
+			LDAP_TAILQ_REMOVE( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv, lc, lc_q );
+			LDAP_TAILQ_ENTRY_INIT( lc, lc_q );
+			LDAP_BACK_CONN_CACHED_CLEAR( lc );
+
+		} else {
+			assert( LDAP_BACK_CONN_TAINTED( lc ) );
+			assert( lc->lc_q.tqe_prev == NULL );
+		}
+
+	} else {
+		ldapconn_t	*tmplc = NULL;
+
+		if ( LDAP_BACK_CONN_CACHED( lc ) ) {
+			assert( !LDAP_BACK_CONN_TAINTED( lc ) );
+			tmplc = ldap_tavl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc,
+				ldap_back_conndnlc_cmp );
+			assert( tmplc == lc );
+			LDAP_BACK_CONN_CACHED_CLEAR( lc );
+		}
+
+		assert( LDAP_BACK_CONN_TAINTED( lc ) || tmplc == lc );
+	}
+
+	return lc;
+}
+
+int
+ldap_back_bind( Operation *op, SlapReply *rs )
+{
+	ldapinfo_t		*li = (ldapinfo_t *) op->o_bd->be_private;
+	ldapconn_t		*lc;
+
+	LDAPControl		**ctrls = NULL;
+	struct berval		save_o_dn;
+	int			save_o_do_not_cache,
+				rc = 0;
+	ber_int_t		msgid;
+	ldap_back_send_t	retrying = LDAP_BACK_RETRYING;
+
+	/* allow rootdn as a means to auth without the need to actually
+ 	 * contact the proxied DSA */
+	switch ( be_rootdn_bind( op, rs ) ) {
+	case SLAP_CB_CONTINUE:
+		break;
+
+	default:
+		return rs->sr_err;
+	}
+
+	lc = ldap_back_getconn( op, rs, LDAP_BACK_BIND_SERR, NULL, NULL );
+	if ( !lc ) {
+		return rs->sr_err;
+	}
+
+	/* we can do (almost) whatever we want with this conn,
+	 * because either it's temporary, or it's marked as binding */
+	if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
+		ch_free( lc->lc_bound_ndn.bv_val );
+		BER_BVZERO( &lc->lc_bound_ndn );
+	}
+	if ( !BER_BVISNULL( &lc->lc_cred ) ) {
+		memset( lc->lc_cred.bv_val, 0, lc->lc_cred.bv_len );
+		ch_free( lc->lc_cred.bv_val );
+		BER_BVZERO( &lc->lc_cred );
+	}
+	LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+
+	/* don't add proxyAuthz; set the bindDN */
+	save_o_dn = op->o_dn;
+	save_o_do_not_cache = op->o_do_not_cache;
+	op->o_dn = op->o_req_dn;
+	op->o_do_not_cache = 1;
+
+	ctrls = op->o_ctrls;
+	rc = ldap_back_controls_add( op, rs, lc, &ctrls );
+	op->o_dn = save_o_dn;
+	op->o_do_not_cache = save_o_do_not_cache;
+	if ( rc != LDAP_SUCCESS ) {
+		send_ldap_result( op, rs );
+		ldap_back_release_conn( li, lc );
+		return( rc );
+	}
+
+retry:;
+	/* method is always LDAP_AUTH_SIMPLE if we got here */
+	rs->sr_err = ldap_sasl_bind( lc->lc_ld, op->o_req_dn.bv_val,
+			LDAP_SASL_SIMPLE,
+			&op->orb_cred, ctrls, NULL, &msgid );
+	/* FIXME: should we always retry, or only when piping the bind
+	 * in the "override" connection pool? */
+	rc = ldap_back_op_result( lc, op, rs, msgid,
+		li->li_timeout[ SLAP_OP_BIND ],
+		LDAP_BACK_BIND_SERR | retrying );
+	if ( rc == LDAP_UNAVAILABLE && retrying ) {
+		retrying &= ~LDAP_BACK_RETRYING;
+		if ( ldap_back_retry( &lc, op, rs, LDAP_BACK_BIND_SERR ) ) {
+			goto retry;
+		}
+		if ( !lc )
+			return( rc );
+	}
+
+	ldap_pvt_thread_mutex_lock( &li->li_counter_mutex );
+	ldap_pvt_mp_add( li->li_ops_completed[ SLAP_OP_BIND ], 1 );
+	ldap_pvt_thread_mutex_unlock( &li->li_counter_mutex );
+
+	ldap_back_controls_free( op, rs, &ctrls );
+
+	if ( rc == LDAP_SUCCESS ) {
+		op->o_conn->c_authz_cookie = op->o_bd->be_private;
+
+		/* If defined, proxyAuthz will be used also when
+		 * back-ldap is the authorizing backend; for this
+		 * purpose, after a successful bind the connection
+		 * is left for further binds, and further operations 
+		 * on this client connection will use a default
+		 * connection with identity assertion */
+		/* NOTE: use with care */
+		if ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
+			ldap_back_release_conn( li, lc );
+			return( rc );
+		}
+
+		/* rebind is now done inside ldap_back_proxy_authz_bind()
+		 * in case of success */
+		LDAP_BACK_CONN_ISBOUND_SET( lc );
+		ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
+
+		if ( !BER_BVISNULL( &lc->lc_cred ) ) {
+			memset( lc->lc_cred.bv_val, 0,
+					lc->lc_cred.bv_len );
+		}
+
+		if ( LDAP_BACK_SAVECRED( li ) ) {
+			ber_bvreplace( &lc->lc_cred, &op->orb_cred );
+			ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
+
+		} else {
+			lc->lc_cred.bv_len = 0;
+		}
+	}
+
+	/* must re-insert if local DN changed as result of bind */
+	if ( !LDAP_BACK_CONN_ISBOUND( lc )
+		|| ( !dn_match( &op->o_req_ndn, &lc->lc_local_ndn )
+			&& !LDAP_BACK_PCONN_ISPRIV( lc ) ) )
+	{
+		int		lerr = -1;
+		ldapconn_t	*tmplc;
+
+		/* wait for all other ops to release the connection */
+retry_lock:;
+		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+		if ( lc->lc_refcnt > 1 ) {
+			ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+			ldap_pvt_thread_yield();
+			goto retry_lock;
+		}
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+		ldap_back_print_conntree( li, ">>> ldap_back_bind" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+		assert( lc->lc_refcnt == 1 );
+		ldap_back_conn_delete( li, lc );
+
+		/* delete all cached connections with the current connection */
+		if ( LDAP_BACK_SINGLECONN( li ) ) {
+			while ( ( tmplc = ldap_tavl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
+			{
+				assert( !LDAP_BACK_PCONN_ISPRIV( lc ) );
+				Debug( LDAP_DEBUG_TRACE,
+					"=>ldap_back_bind: destroying conn %lu (refcnt=%u)\n",
+					lc->lc_conn->c_connid, lc->lc_refcnt );
+
+				if ( tmplc->lc_refcnt != 0 ) {
+					/* taint it */
+					LDAP_BACK_CONN_TAINTED_SET( tmplc );
+					LDAP_BACK_CONN_CACHED_CLEAR( tmplc );
+
+				} else {
+					/*
+					 * Needs a test because the handler may be corrupted,
+					 * and calling ldap_unbind on a corrupted header results
+					 * in a segmentation fault
+					 */
+					ldap_back_conn_free( tmplc );
+				}
+			}
+		}
+
+		if ( LDAP_BACK_CONN_ISBOUND( lc ) ) {
+			ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
+			if ( be_isroot_dn( op->o_bd, &op->o_req_ndn ) ) {
+				LDAP_BACK_PCONN_ROOTDN_SET( lc, op );
+			}
+			lerr = ldap_tavl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
+				ldap_back_conndn_cmp, ldap_back_conndn_dup );
+		}
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+		ldap_back_print_conntree( li, "<<< ldap_back_bind" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+	
+		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+		switch ( lerr ) {
+		case 0:
+			LDAP_BACK_CONN_CACHED_SET( lc );
+			break;
+
+		case -1:
+			/* duplicate; someone else successfully bound
+			 * on the same connection with the same identity;
+			 * we can do this because lc_refcnt == 1 */
+			ldap_back_conn_free( lc );
+			lc = NULL;
+		}
+	}
+
+	if ( lc != NULL ) {
+		ldap_back_release_conn( li, lc );
+	}
+
+	return( rc );
+}
+
+/*
+ * ldap_back_conndn_cmp
+ *
+ * compares two ldapconn_t based on the value of the conn pointer
+ * and of the local DN; used by avl stuff for insert, lookup
+ * and direct delete
+ */
+int
+ldap_back_conndn_cmp( const void *c1, const void *c2 )
+{
+	const ldapconn_t	*lc1 = (const ldapconn_t *)c1;
+	const ldapconn_t	*lc2 = (const ldapconn_t *)c2;
+	int rc;
+
+	/* If local DNs don't match, it is definitely not a match */
+	/* For shared sessions, conn is NULL. Only explicitly
+	 * bound sessions will have non-NULL conn.
+	 */
+	rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
+	if ( rc == 0 ) {
+		rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
+	}
+
+	return rc;
+}
+
+/*
+ * ldap_back_conndnlc_cmp
+ *
+ * compares two ldapconn_t based on the value of the conn pointer,
+ * the local DN and the lc pointer; used by avl stuff for insert, lookup
+ * and direct delete
+ */
+static int
+ldap_back_conndnlc_cmp( const void *c1, const void *c2 )
+{
+	const ldapconn_t	*lc1 = (const ldapconn_t *)c1;
+	const ldapconn_t	*lc2 = (const ldapconn_t *)c2;
+	int rc;
+
+	/* If local DNs don't match, it is definitely not a match */
+	/* For shared sessions, conn is NULL. Only explicitly
+	 * bound sessions will have non-NULL conn.
+	 */
+	rc = SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
+	if ( rc == 0 ) {
+		rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
+		if ( rc == 0 ) {
+			rc = SLAP_PTRCMP( lc1, lc2 );
+		}
+	}
+
+	return rc;
+}
+
+/*
+ * ldap_back_conn_cmp
+ *
+ * compares two ldapconn_t based on the value of the conn pointer;
+ * used by avl stuff for delete of all conns with the same connid
+ */
+int
+ldap_back_conn_cmp( const void *c1, const void *c2 )
+{
+	const ldapconn_t	*lc1 = (const ldapconn_t *)c1;
+	const ldapconn_t	*lc2 = (const ldapconn_t *)c2;
+
+	/* For shared sessions, conn is NULL. Only explicitly
+	 * bound sessions will have non-NULL conn.
+	 */
+	return SLAP_PTRCMP( lc1->lc_conn, lc2->lc_conn );
+}
+
+/*
+ * ldap_back_conndn_dup
+ *
+ * returns -1 in case a duplicate ldapconn_t has been inserted;
+ * used by avl stuff
+ */
+int
+ldap_back_conndn_dup( void *c1, void *c2 )
+{
+	ldapconn_t	*lc1 = (ldapconn_t *)c1;
+	ldapconn_t	*lc2 = (ldapconn_t *)c2;
+
+	/* Cannot have more than one shared session with same DN */
+	if ( lc1->lc_conn == lc2->lc_conn &&
+		dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) )
+	{
+		return -1;
+	}
+		
+	return 0;
+}
+
+static int
+ldap_back_freeconn( ldapinfo_t *li, ldapconn_t *lc, int dolock )
+{
+	if ( dolock ) {
+		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+	}
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+	ldap_back_print_conntree( li, ">>> ldap_back_freeconn" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+	(void)ldap_back_conn_delete( li, lc );
+
+	if ( lc->lc_refcnt == 0 ) {
+		ldap_back_conn_free( (void *)lc );
+	}
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+	ldap_back_print_conntree( li, "<<< ldap_back_freeconn" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+	if ( dolock ) {
+		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+	}
+
+	return 0;
+}
+
+#ifdef HAVE_TLS
+static int
+ldap_back_start_tls(
+	LDAP		*ld,
+	int		protocol,
+	int		*is_tls,
+	const char	*url,
+	unsigned	flags,
+	int		timeout,
+	const char	**text )
+{
+	int		rc = LDAP_SUCCESS;
+
+	/* start TLS ("tls-[try-]{start,propagate}" statements) */
+	if ( ( LDAP_BACK_USE_TLS_F( flags ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS_F( flags ) ) )
+				&& !ldap_is_ldaps_url( url ) )
+	{
+#ifdef SLAP_STARTTLS_ASYNCHRONOUS
+		/*
+		 * use asynchronous StartTLS
+		 * in case, chase referral (not implemented yet)
+		 */
+		int		msgid;
+
+		if ( protocol == 0 ) {
+			ldap_get_option( ld, LDAP_OPT_PROTOCOL_VERSION,
+					(void *)&protocol );
+		}
+
+		if ( protocol < LDAP_VERSION3 ) {
+			/* we should rather bail out... */
+			rc = LDAP_UNWILLING_TO_PERFORM;
+			*text = "invalid protocol version";
+		}
+
+		if ( rc == LDAP_SUCCESS ) {
+			rc = ldap_start_tls( ld, NULL, NULL, &msgid );
+		}
+
+		if ( rc == LDAP_SUCCESS ) {
+			LDAPMessage	*res = NULL;
+			struct timeval	tv;
+
+			if ( timeout ) {
+				tv.tv_sec = timeout;
+				tv.tv_usec = 0;
+			} else {
+				LDAP_BACK_TV_SET( &tv );
+			}
+			rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
+			if ( rc <= 0 ) {
+				rc = LDAP_UNAVAILABLE;
+
+			} else if ( rc == LDAP_RES_EXTENDED ) {
+				struct berval	*data = NULL;
+
+				rc = ldap_parse_extended_result( ld, res,
+						NULL, &data, 0 );
+				if ( rc == LDAP_SUCCESS ) {
+					SlapReply rs;
+					rc = ldap_parse_result( ld, res, &rs.sr_err,
+						NULL, NULL, NULL, NULL, 1 );
+					if ( rc != LDAP_SUCCESS ) {
+						rs.sr_err = rc;
+					}
+					rc = slap_map_api2result( &rs );
+					res = NULL;
+					
+					/* FIXME: in case a referral 
+					 * is returned, should we try
+					 * using it instead of the 
+					 * configured URI? */
+					if ( rc == LDAP_SUCCESS ) {
+						rc = ldap_install_tls( ld );
+
+					} else if ( rc == LDAP_REFERRAL ) {
+						rc = LDAP_UNWILLING_TO_PERFORM;
+						*text = "unwilling to chase referral returned by Start TLS exop";
+					}
+
+					if ( data ) {
+						if ( data->bv_val ) {
+							ber_memfree( data->bv_val );
+						}
+						ber_memfree( data );
+					}
+				}
+
+			} else {
+				rc = LDAP_OTHER;
+			}
+
+			if ( res != NULL ) {
+				ldap_msgfree( res );
+			}
+		}
+#else /* ! SLAP_STARTTLS_ASYNCHRONOUS */
+		/*
+		 * use synchronous StartTLS
+		 */
+		rc = ldap_start_tls_s( ld, NULL, NULL );
+#endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */
+
+		/* if StartTLS is requested, only attempt it if the URL
+		 * is not "ldaps://"; this may occur not only in case
+		 * of misconfiguration, but also when used in the chain 
+		 * overlay, where the "uri" can be parsed out of a referral */
+		switch ( rc ) {
+		case LDAP_SUCCESS:
+			*is_tls = 1;
+			break;
+
+		case LDAP_SERVER_DOWN:
+			break;
+
+		default:
+			if ( LDAP_BACK_TLS_CRITICAL_F( flags ) ) {
+				*text = "could not start TLS";
+				break;
+			}
+
+			/* in case Start TLS is not critical */
+			*is_tls = 0;
+			rc = LDAP_SUCCESS;
+			break;
+		}
+
+	} else {
+		*is_tls = 0;
+	}
+
+	return rc;
+}
+#endif /* HAVE_TLS */
+
+static int
+ldap_back_prepare_conn( ldapconn_t *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+	int		version;
+	LDAP		*ld = NULL;
+#ifdef HAVE_TLS
+	int		is_tls = op->o_conn->c_is_tls;
+	int		flags = li->li_flags;
+	time_t		lctime = (time_t)(-1);
+	slap_bindconf *sb;
+#endif /* HAVE_TLS */
+
+	ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
+	rs->sr_err = ldap_initialize( &ld, li->li_uri );
+	ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+		goto error_return;
+	}
+
+	if ( li->li_urllist_f ) {
+		ldap_set_urllist_proc( ld, li->li_urllist_f, li->li_urllist_p );
+	}
+
+	/* Set LDAP version. This will always succeed: If the client
+	 * bound with a particular version, then so can we.
+	 */
+	if ( li->li_version != 0 ) {
+		version = li->li_version;
+
+	} else if ( op->o_protocol != 0 ) {
+		version = op->o_protocol;
+
+	} else {
+		/* assume it's an internal op; set to LDAPv3 */
+		version = LDAP_VERSION3;
+	}
+	ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&version );
+
+	/* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */
+	ldap_set_option( ld, LDAP_OPT_REFERRALS,
+		LDAP_BACK_CHASE_REFERRALS( li ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
+
+	if ( li->li_network_timeout > 0 ) {
+		struct timeval		tv;
+
+		tv.tv_sec = li->li_network_timeout;
+		tv.tv_usec = 0;
+		ldap_set_option( ld, LDAP_OPT_NETWORK_TIMEOUT, (const void *)&tv );
+	}
+
+	/* turn on network keepalive, if configured so */
+	slap_client_keepalive(ld, &li->li_tls.sb_keepalive);
+
+	if ( li->li_tls.sb_tcp_user_timeout > 0 ) {
+		ldap_set_option( ld, LDAP_OPT_TCP_USER_TIMEOUT,
+				&li->li_tls.sb_tcp_user_timeout );
+	}
+
+#ifdef HAVE_TLS
+	if ( LDAP_BACK_CONN_ISPRIV( lc ) ) {
+		/* See "rationale" comment in ldap_back_getconn() */
+		if ( li->li_acl_authmethod == LDAP_AUTH_NONE &&
+			 li->li_idassert_authmethod != LDAP_AUTH_NONE )
+			sb = &li->li_idassert.si_bc;
+		else
+			sb = &li->li_acl;
+
+	} else if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
+		sb = &li->li_idassert.si_bc;
+
+	} else {
+		sb = &li->li_tls;
+	}
+
+	bindconf_tls_set( sb, ld );
+
+	/* if required by the bindconf configuration, force TLS */
+	if ( ( sb == &li->li_acl || sb == &li->li_idassert.si_bc ) &&
+		sb->sb_tls_ctx )
+	{
+		flags |= LDAP_BACK_F_USE_TLS;
+	}
+
+	ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
+	assert( li->li_uri_mutex_do_not_lock == 0 );
+	li->li_uri_mutex_do_not_lock = 1;
+	rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
+			li->li_uri, flags, li->li_timeout[ SLAP_OP_BIND ], &rs->sr_text );
+	li->li_uri_mutex_do_not_lock = 0;
+	ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+		ldap_unbind_ext( ld, NULL, NULL );
+		rs->sr_text = "Start TLS failed";
+		goto error_return;
+
+	} else if ( li->li_idle_timeout ) {
+		/* only touch when activity actually took place... */
+		lctime = op->o_time;
+	}
+#endif /* HAVE_TLS */
+
+	lc->lc_ld = ld;
+	lc->lc_refcnt = 1;
+#ifdef HAVE_TLS
+	if ( is_tls ) {
+		LDAP_BACK_CONN_ISTLS_SET( lc );
+	} else {
+		LDAP_BACK_CONN_ISTLS_CLEAR( lc );
+	}
+	if ( lctime != (time_t)(-1) ) {
+		lc->lc_time = lctime;
+	}
+#endif /* HAVE_TLS */
+
+error_return:;
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+		rs->sr_err = slap_map_api2result( rs );
+		if ( sendok & LDAP_BACK_SENDERR ) {
+			if ( rs->sr_text == NULL ) {
+				rs->sr_text = "Proxy connection initialization failed";
+			}
+			send_ldap_result( op, rs );
+		}
+
+	} else {
+		if ( li->li_conn_ttl > 0 ) {
+			lc->lc_create_time = op->o_time;
+		}
+	}
+
+	return rs->sr_err;
+}
+
+static ldapconn_t *
+ldap_back_getconn(
+	Operation		*op,
+	SlapReply		*rs,
+	ldap_back_send_t	sendok,
+	struct berval		*binddn,
+	struct berval		*bindcred )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+	ldapconn_t	*lc = NULL,
+			lc_curr = {{ 0 }};
+	int		refcnt = 1,
+			lookupconn = !( sendok & LDAP_BACK_BINDING );
+
+	/* if the server is quarantined, and
+	 * - the current interval did not expire yet, or
+	 * - no more retries should occur,
+	 * don't return the connection */
+	if ( li->li_isquarantined ) {
+		slap_retry_info_t	*ri = &li->li_quarantine;
+		int			dont_retry = 1;
+
+		if ( li->li_quarantine.ri_interval ) {
+			ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
+			if ( li->li_isquarantined == LDAP_BACK_FQ_YES ) {
+				dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL
+					|| slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] );
+				if ( !dont_retry ) {
+					Debug( LDAP_DEBUG_ANY,
+						"%s: ldap_back_getconn quarantine "
+						"retry block #%d try #%d.\n",
+						op->o_log_prefix, ri->ri_idx, ri->ri_count );
+					li->li_isquarantined = LDAP_BACK_FQ_RETRYING;
+				}
+			}
+			ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
+		}
+
+		if ( dont_retry ) {
+			rs->sr_err = LDAP_UNAVAILABLE;
+			if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
+				rs->sr_text = "Target is quarantined";
+				send_ldap_result( op, rs );
+			}
+			return NULL;
+		}
+	}
+
+	/* Internal searches are privileged and shared. So is root. */
+	if ( op->o_do_not_cache || be_isroot( op ) ) {
+		LDAP_BACK_CONN_ISPRIV_SET( &lc_curr );
+		lc_curr.lc_local_ndn = op->o_bd->be_rootndn;
+		LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
+
+	} else {
+		struct berval	tmpbinddn,
+				tmpbindcred,
+				save_o_dn,
+				save_o_ndn;
+		int		isproxyauthz;
+
+		/* need cleanup */
+		if ( binddn == NULL ) {
+			binddn = &tmpbinddn;
+		}	
+		if ( bindcred == NULL ) {
+			bindcred = &tmpbindcred;
+		}
+		if ( op->o_tag == LDAP_REQ_BIND ) {
+			save_o_dn = op->o_dn;
+			save_o_ndn = op->o_ndn;
+			op->o_dn = op->o_req_dn;
+			op->o_ndn = op->o_req_ndn;
+		}
+		isproxyauthz = ldap_back_is_proxy_authz( op, rs, sendok, binddn, bindcred );
+		if ( op->o_tag == LDAP_REQ_BIND ) {
+			op->o_dn = save_o_dn;
+			op->o_ndn = save_o_ndn;
+		}
+		if ( isproxyauthz == -1 ) {
+			return NULL;
+		}
+
+		lc_curr.lc_local_ndn = op->o_ndn;
+		/* Explicit binds must not be shared;
+		 * however, explicit binds are piped in a special connection
+		 * when idassert is to occur with "override" set */
+		if ( op->o_tag == LDAP_REQ_BIND && !isproxyauthz ) {
+			lc_curr.lc_conn = op->o_conn;
+
+		} else {
+			if ( isproxyauthz && !( sendok & LDAP_BACK_BINDING ) ) {
+				lc_curr.lc_local_ndn = *binddn;
+				LDAP_BACK_PCONN_ROOTDN_SET( &lc_curr, op );
+				LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
+
+			} else if ( isproxyauthz && ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) {
+				lc_curr.lc_local_ndn = slap_empty_bv;
+				LDAP_BACK_PCONN_BIND_SET( &lc_curr, op );
+				LDAP_BACK_CONN_ISIDASSERT_SET( &lc_curr );
+				lookupconn = 1;
+
+			} else if ( SLAP_IS_AUTHZ_BACKEND( op ) ) {
+				lc_curr.lc_conn = op->o_conn;
+
+			} else {
+				LDAP_BACK_PCONN_ANON_SET( &lc_curr, op );
+			}
+		}
+	}
+
+	/* Explicit Bind requests always get their own conn */
+	if ( lookupconn ) {
+retry_lock:
+		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+		if ( LDAP_BACK_PCONN_ISPRIV( &lc_curr ) ) {
+			/* lookup a conn that's not binding */
+			LDAP_TAILQ_FOREACH( lc,
+				&li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv,
+				lc_q )
+			{
+				if ( !LDAP_BACK_CONN_BINDING( lc ) && lc->lc_refcnt == 0 ) {
+					break;
+				}
+			}
+
+			if ( lc != NULL ) {
+				if ( lc != LDAP_TAILQ_LAST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
+					lc_conn_priv_q ) )
+				{
+					LDAP_TAILQ_REMOVE( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
+						lc, lc_q );
+					LDAP_TAILQ_ENTRY_INIT( lc, lc_q );
+					LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv,
+						lc, lc_q );
+				}
+
+			} else if ( !LDAP_BACK_USE_TEMPORARIES( li )
+				&& li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_num == li->li_conn_priv_max )
+			{
+				lc = LDAP_TAILQ_FIRST( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( &lc_curr ) ].lic_priv );
+			}
+			
+		} else {
+
+			/* Searches for a ldapconn in the avl tree */
+			lc = (ldapconn_t *)ldap_tavl_find( li->li_conninfo.lai_tree, 
+					(caddr_t)&lc_curr, ldap_back_conndn_cmp );
+		}
+
+		if ( lc != NULL ) {
+			/* Don't reuse connections while they're still binding */
+			if ( LDAP_BACK_CONN_BINDING( lc ) ) {
+				if ( !LDAP_BACK_USE_TEMPORARIES( li ) ) {
+					ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+					ldap_pvt_thread_yield();
+					goto retry_lock;
+				}
+				lc = NULL;
+			}
+
+			if ( lc != NULL ) {
+				if ( op->o_tag == LDAP_REQ_BIND ) {
+					/* right now, this is the only possible case */
+					assert( ( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) );
+					LDAP_BACK_CONN_BINDING_SET( lc );
+				}
+
+				refcnt = ++lc->lc_refcnt;
+			}
+		}
+		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+	}
+
+	/* Looks like we didn't get a bind. Open a new session... */
+	if ( lc == NULL ) {
+		lc = (ldapconn_t *)ch_calloc( 1, sizeof( ldapconn_t ) );
+		lc->lc_flags = li->li_flags;
+		lc->lc_lcflags = lc_curr.lc_lcflags;
+		lc->lc_ldapinfo = li;
+		if ( ldap_back_prepare_conn( lc, op, rs, sendok ) != LDAP_SUCCESS ) {
+			ch_free( lc );
+			return NULL;
+		}
+
+		if ( sendok & LDAP_BACK_BINDING ) {
+			LDAP_BACK_CONN_BINDING_SET( lc );
+		}
+
+		lc->lc_conn = lc_curr.lc_conn;
+		ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
+
+		/*
+		 * the rationale is: connections as the rootdn are privileged,
+		 * so li_acl is to be used; however, in some cases
+		 * one already configured identity assertion with a highly
+		 * privileged idassert_authcDN, so if li_acl is not configured
+		 * and idassert is, use idassert instead.
+		 *
+		 * might change in the future, because it's preferable
+		 * to make clear what identity is being used, since
+		 * the only drawback is that one risks to configure
+		 * the same identity twice...
+		 */
+		if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
+			if ( li->li_acl_authmethod == LDAP_AUTH_NONE &&
+				 li->li_idassert_authmethod != LDAP_AUTH_NONE ) {
+				ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
+				ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
+
+			} else {
+				ber_dupbv( &lc->lc_bound_ndn, &li->li_acl_authcDN );
+				ber_dupbv( &lc->lc_cred, &li->li_acl_passwd );
+			}
+			LDAP_BACK_CONN_ISPRIV_SET( lc );
+
+		} else if ( LDAP_BACK_CONN_ISIDASSERT( &lc_curr ) ) {
+			if ( !LDAP_BACK_PCONN_ISBIND( &lc_curr ) ) {
+				ber_dupbv( &lc->lc_bound_ndn, &li->li_idassert_authcDN );
+				ber_dupbv( &lc->lc_cred, &li->li_idassert_passwd );
+			}
+			LDAP_BACK_CONN_ISIDASSERT_SET( lc );
+
+		} else {
+			BER_BVZERO( &lc->lc_cred );
+			BER_BVZERO( &lc->lc_bound_ndn );
+			if ( !BER_BVISEMPTY( &op->o_ndn )
+				&& SLAP_IS_AUTHZ_BACKEND( op ) )
+			{
+				ber_dupbv( &lc->lc_bound_ndn, &op->o_ndn );
+			}
+		}
+
+#ifdef HAVE_TLS
+		/* if start TLS failed but it was not mandatory,
+		 * check if the non-TLS connection was already
+		 * in cache; in case, destroy the newly created
+		 * connection and use the existing one */
+		if ( LDAP_BACK_PCONN_ISTLS( lc ) 
+				&& !ldap_tls_inplace( lc->lc_ld ) )
+		{
+			ldapconn_t	*tmplc = NULL;
+			int		idx = LDAP_BACK_CONN2PRIV( &lc_curr ) - 1;
+			
+			ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+			LDAP_TAILQ_FOREACH( tmplc,
+				&li->li_conn_priv[ idx ].lic_priv,
+				lc_q )
+			{
+				if ( !LDAP_BACK_CONN_BINDING( tmplc ) ) {
+					break;
+				}
+			}
+
+			if ( tmplc != NULL ) {
+				refcnt = ++tmplc->lc_refcnt;
+				ldap_back_conn_free( lc );
+				lc = tmplc;
+			}
+			ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+			if ( tmplc != NULL ) {
+				goto done;
+			}
+		}
+#endif /* HAVE_TLS */
+
+		/* Inserts the newly created ldapconn in the avl tree */
+		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+
+		LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+		lc->lc_connid = li->li_conn_nextid++;
+
+		assert( lc->lc_refcnt == 1 );
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+		ldap_back_print_conntree( li, ">>> ldap_back_getconn(insert)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+	
+		if ( LDAP_BACK_PCONN_ISPRIV( lc ) ) {
+			if ( li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num < li->li_conn_priv_max ) {
+				LDAP_TAILQ_INSERT_TAIL( &li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_priv, lc, lc_q );
+				li->li_conn_priv[ LDAP_BACK_CONN2PRIV( lc ) ].lic_num++;
+				LDAP_BACK_CONN_CACHED_SET( lc );
+
+			} else {
+				LDAP_BACK_CONN_TAINTED_SET( lc );
+			}
+			rs->sr_err = 0;
+
+		} else {
+			rs->sr_err = ldap_tavl_insert( &li->li_conninfo.lai_tree, (caddr_t)lc,
+				ldap_back_conndn_cmp, ldap_back_conndn_dup );
+			LDAP_BACK_CONN_CACHED_SET( lc );
+		}
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+		ldap_back_print_conntree( li, "<<< ldap_back_getconn(insert)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+	
+		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+		Debug(LDAP_DEBUG_TRACE,
+		      "=>ldap_back_getconn: %s: lc=%p inserted refcnt=%u rc=%d\n",
+		      op->o_log_prefix, (void *)lc, refcnt,
+		      rs->sr_err );
+	
+		if ( !LDAP_BACK_PCONN_ISPRIV( lc ) ) {
+			/* Err could be -1 in case a duplicate ldapconn is inserted */
+			switch ( rs->sr_err ) {
+			case 0:
+				break;
+
+			case -1:
+				LDAP_BACK_CONN_CACHED_CLEAR( lc );
+				if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( li ) ) {
+					/* duplicate: free and try to get the newly created one */
+					ldap_back_conn_free( lc );
+					lc = NULL;
+					goto retry_lock;
+				}
+
+				/* taint connection, so that it'll be freed when released */
+				LDAP_BACK_CONN_TAINTED_SET( lc );
+				break;
+
+			default:
+				LDAP_BACK_CONN_CACHED_CLEAR( lc );
+				ldap_back_conn_free( lc );
+				rs->sr_err = LDAP_OTHER;
+				rs->sr_text = "Proxy bind collision";
+				if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
+					send_ldap_result( op, rs );
+				}
+				return NULL;
+			}
+		}
+		ldap_back_schedule_conn_expiry( li, lc );
+
+	} else {
+		int	expiring = 0;
+
+		if ( ( li->li_idle_timeout != 0 && op->o_time > lc->lc_time + li->li_idle_timeout )
+			|| ( li->li_conn_ttl != 0 && op->o_time > lc->lc_create_time + li->li_conn_ttl ) )
+		{
+			expiring = 1;
+
+			/* let it be used, but taint/delete it so that 
+			 * no-one else can look it up any further */
+			ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+			ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+			(void)ldap_back_conn_delete( li, lc );
+			LDAP_BACK_CONN_TAINTED_SET( lc );
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+			ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+			ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+		}
+
+		Debug(LDAP_DEBUG_TRACE,
+		      "=>ldap_back_getconn: conn %p fetched refcnt=%u%s.\n",
+		      (void *)lc, refcnt, expiring ? " expiring" : "" );
+	}
+
+#ifdef HAVE_TLS
+done:;
+#endif /* HAVE_TLS */
+
+	return lc;
+}
+
+void
+ldap_back_release_conn_lock(
+	ldapinfo_t		*li,
+	ldapconn_t		**lcp,
+	int			dolock )
+{
+
+	ldapconn_t	*lc = *lcp;
+
+	if ( dolock ) {
+		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+	}
+	assert( lc->lc_refcnt > 0 );
+	LDAP_BACK_CONN_BINDING_CLEAR( lc );
+	lc->lc_refcnt--;
+	if ( LDAP_BACK_CONN_TAINTED( lc ) ) {
+		ldap_back_freeconn( li, lc, 0 );
+		*lcp = NULL;
+	}
+	if ( dolock ) {
+		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+	}
+}
+
+void
+ldap_back_quarantine(
+	Operation	*op,
+	SlapReply	*rs )
+{
+	ldapinfo_t		*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	slap_retry_info_t	*ri = &li->li_quarantine;
+
+	ldap_pvt_thread_mutex_lock( &li->li_quarantine_mutex );
+
+	if ( rs->sr_err == LDAP_UNAVAILABLE ) {
+		time_t		new_last = slap_get_time();
+
+		switch ( li->li_isquarantined ) {
+		case LDAP_BACK_FQ_NO:
+			if ( ri->ri_last == new_last ) {
+				goto done;
+			}
+
+			Debug( LDAP_DEBUG_ANY,
+				"%s: ldap_back_quarantine enter.\n",
+				op->o_log_prefix );
+
+			ri->ri_idx = 0;
+			ri->ri_count = 0;
+			break;
+
+		case LDAP_BACK_FQ_RETRYING:
+			Debug( LDAP_DEBUG_ANY,
+				"%s: ldap_back_quarantine block #%d try #%d failed.\n",
+				op->o_log_prefix, ri->ri_idx, ri->ri_count );
+
+			++ri->ri_count;
+			if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER
+				&& ri->ri_count == ri->ri_num[ ri->ri_idx ] )
+			{
+				ri->ri_count = 0;
+				++ri->ri_idx;
+			}
+			break;
+
+		default:
+			goto done;
+		}
+
+		li->li_isquarantined = LDAP_BACK_FQ_YES;
+		ri->ri_last = new_last;
+
+	} else if ( li->li_isquarantined != LDAP_BACK_FQ_NO ) {
+		if ( ri->ri_last == slap_get_time() ) {
+			goto done;
+		}
+
+		Debug( LDAP_DEBUG_ANY,
+			"%s: ldap_back_quarantine exit (%d) err=%d.\n",
+			op->o_log_prefix, li->li_isquarantined, rs->sr_err );
+
+		if ( li->li_quarantine_f ) {
+			(void)li->li_quarantine_f( li, li->li_quarantine_p );
+		}
+
+		ri->ri_count = 0;
+		ri->ri_idx = 0;
+		li->li_isquarantined = LDAP_BACK_FQ_NO;
+	}
+
+done:;
+	ldap_pvt_thread_mutex_unlock( &li->li_quarantine_mutex );
+}
+
+static int
+ldap_back_dobind_cb(
+	Operation *op,
+	SlapReply *rs
+)
+{
+	ber_tag_t *tptr = op->o_callback->sc_private;
+	op->o_tag = *tptr;
+	rs->sr_tag = slap_req2res( op->o_tag );
+
+	return SLAP_CB_CONTINUE;
+}
+
+/*
+ * ldap_back_dobind_int
+ *
+ * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
+ */
+static int
+ldap_back_dobind_int(
+	ldapconn_t		**lcp,
+	Operation		*op,
+	SlapReply		*rs,
+	ldap_back_send_t	sendok,
+	int			retries,
+	int			dolock )
+{	
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	ldapconn_t	*lc;
+	struct berval	binddn = slap_empty_bv,
+			bindcred = slap_empty_bv;
+
+	int		rc = 0,
+			isbound,
+			binding = 0;
+	ber_int_t	msgid;
+	ber_tag_t	o_tag = op->o_tag;
+	slap_callback cb = {0};
+	char		*tmp_dn;
+
+	assert( lcp != NULL );
+	assert( retries >= 0 );
+
+	if ( sendok & LDAP_BACK_GETCONN ) {
+		assert( *lcp == NULL );
+
+		lc = ldap_back_getconn( op, rs, sendok, &binddn, &bindcred );
+		if ( lc == NULL ) {
+			return 0;
+		}
+		*lcp = lc;
+
+	} else {
+		lc = *lcp;
+	}
+
+	assert( lc != NULL );
+
+retry_lock:;
+ 	if ( dolock ) {
+ 		ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+ 	}
+
+ 	if ( binding == 0 ) {
+		/* check if already bound */
+		rc = isbound = LDAP_BACK_CONN_ISBOUND( lc );
+		if ( isbound ) {
+ 			if ( dolock ) {
+ 				ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+ 			}
+			return rc;
+		}
+
+		if ( LDAP_BACK_CONN_BINDING( lc ) ) {
+			/* if someone else is about to bind it, give up and retry */
+ 			if ( dolock ) {
+ 				ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+ 			}
+			ldap_pvt_thread_yield();
+			goto retry_lock;
+
+		} else {
+			/* otherwise this thread will bind it */
+ 			LDAP_BACK_CONN_BINDING_SET( lc );
+			binding = 1;
+		}
+	}
+
+ 	if ( dolock ) {
+ 		ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+ 	}
+
+	/*
+	 * FIXME: we need to let clients use proxyAuthz
+	 * otherwise we cannot do symmetric pools of servers;
+	 * we have to live with the fact that a user can
+	 * authorize itself as any ID that is allowed
+	 * by the authzTo directive of the "proxyauthzdn".
+	 */
+	/*
+	 * NOTE: current Proxy Authorization specification
+	 * and implementation do not allow proxy authorization
+	 * control to be provided with Bind requests
+	 */
+	/*
+	 * if no bind took place yet, but the connection is bound
+	 * and the "idassert-authcDN" (or other ID) is set, 
+	 * then bind as the asserting identity and explicitly 
+	 * add the proxyAuthz control to every operation with the
+	 * dn bound to the connection as control value.
+	 * This is done also if this is the authorizing backend,
+	 * but the "override" flag is given to idassert.
+	 * It allows to use SASL bind and yet proxyAuthz users
+	 */
+	op->o_tag = LDAP_REQ_BIND;
+	cb.sc_next = op->o_callback;
+	cb.sc_private = &o_tag;
+	cb.sc_response = ldap_back_dobind_cb;
+	op->o_callback = &cb;
+
+	if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
+		if ( BER_BVISEMPTY( &binddn ) && BER_BVISEMPTY( &bindcred ) ) {
+			/* if we got here, it shouldn't return result */
+			rc = ldap_back_is_proxy_authz( op, rs,
+				LDAP_BACK_DONTSEND, &binddn, &bindcred );
+			if ( rc != 1 ) {
+				Debug( LDAP_DEBUG_ANY, "Error: ldap_back_is_proxy_authz "
+					"returned %d, misconfigured URI?\n", rc );
+				rs->sr_err = LDAP_OTHER;
+				rs->sr_text = "misconfigured URI?";
+				LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+				if ( sendok & LDAP_BACK_SENDERR ) {
+					send_ldap_result( op, rs );
+				}
+				goto done;
+			}
+		}
+		rc = ldap_back_proxy_authz_bind( lc, op, rs, sendok, &binddn, &bindcred );
+		goto done;
+	}
+
+#ifdef HAVE_CYRUS_SASL
+	if ( LDAP_BACK_CONN_ISPRIV( lc )) {
+	slap_bindconf *sb;
+	if ( li->li_acl_authmethod != LDAP_AUTH_NONE )
+		sb = &li->li_acl;
+	else
+		sb = &li->li_idassert.si_bc;
+
+	if ( sb->sb_method == LDAP_AUTH_SASL ) {
+		void		*defaults = NULL;
+
+		if ( sb->sb_secprops != NULL ) {
+			rc = ldap_set_option( lc->lc_ld,
+				LDAP_OPT_X_SASL_SECPROPS, sb->sb_secprops );
+
+			if ( rc != LDAP_OPT_SUCCESS ) {
+				Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
+					"(SECPROPS,\"%s\") failed!\n",
+					sb->sb_secprops );
+				goto done;
+			}
+		}
+
+		defaults = lutil_sasl_defaults( lc->lc_ld,
+				sb->sb_saslmech.bv_val,
+				sb->sb_realm.bv_val,
+				sb->sb_authcId.bv_val,
+				sb->sb_cred.bv_val,
+				NULL );
+		if ( defaults == NULL ) {
+			rs->sr_err = LDAP_OTHER;
+			LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+			if ( sendok & LDAP_BACK_SENDERR ) {
+				send_ldap_result( op, rs );
+			}
+			goto done;
+		}
+
+		rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
+				sb->sb_binddn.bv_val,
+				sb->sb_saslmech.bv_val, NULL, NULL,
+				LDAP_SASL_QUIET, lutil_sasl_interact,
+				defaults );
+
+		ldap_pvt_thread_mutex_lock( &li->li_counter_mutex );
+		ldap_pvt_mp_add( li->li_ops_completed[ SLAP_OP_BIND ], 1 );
+		ldap_pvt_thread_mutex_unlock( &li->li_counter_mutex );
+
+		lutil_sasl_freedefs( defaults );
+
+		switch ( rs->sr_err ) {
+		case LDAP_SUCCESS:
+			LDAP_BACK_CONN_ISBOUND_SET( lc );
+			break;
+
+		case LDAP_LOCAL_ERROR:
+			/* list client API error codes that require
+			 * to taint the connection */
+			/* FIXME: should actually retry? */
+			LDAP_BACK_CONN_TAINTED_SET( lc );
+
+			/* fallthru */
+
+		default:
+			LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+			rs->sr_err = slap_map_api2result( rs );
+			if ( sendok & LDAP_BACK_SENDERR ) {
+				send_ldap_result( op, rs );
+			}
+			break;
+		}
+
+		if ( LDAP_BACK_QUARANTINE( li ) ) {
+			ldap_back_quarantine( op, rs );
+		}
+
+		goto done;
+	}
+	}
+#endif /* HAVE_CYRUS_SASL */
+
+retry:;
+	if ( BER_BVISNULL( &lc->lc_cred ) ) {
+		tmp_dn = "";
+		if ( !BER_BVISNULL( &lc->lc_bound_ndn ) && !BER_BVISEMPTY( &lc->lc_bound_ndn ) ) {
+			Debug( LDAP_DEBUG_ANY, "%s ldap_back_dobind_int: DN=\"%s\" without creds, binding anonymously",
+				op->o_log_prefix, lc->lc_bound_ndn.bv_val );
+		}
+
+	} else {
+		tmp_dn = lc->lc_bound_ndn.bv_val;
+	}
+	rs->sr_err = ldap_sasl_bind( lc->lc_ld,
+			tmp_dn,
+			LDAP_SASL_SIMPLE, &lc->lc_cred,
+			NULL, NULL, &msgid );
+
+	ldap_pvt_thread_mutex_lock( &li->li_counter_mutex );
+	ldap_pvt_mp_add( li->li_ops_completed[ SLAP_OP_BIND ], 1 );
+	ldap_pvt_thread_mutex_unlock( &li->li_counter_mutex );
+
+	if ( rs->sr_err == LDAP_SERVER_DOWN ) {
+		if ( retries != LDAP_BACK_RETRY_NEVER ) {
+			if ( dolock ) {
+				ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+			}
+
+			assert( lc->lc_refcnt > 0 );
+			if ( lc->lc_refcnt == 1 ) {
+				ldap_unbind_ext( lc->lc_ld, NULL, NULL );
+				lc->lc_ld = NULL;
+
+				/* lc here must be the regular lc, reset and ready for init */
+				rs->sr_err = ldap_back_prepare_conn( lc, op, rs, sendok );
+				if ( rs->sr_err != LDAP_SUCCESS ) {
+					sendok &= ~LDAP_BACK_SENDERR;
+					lc->lc_refcnt = 0;
+				}
+			}
+
+			if ( dolock ) {
+				ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+			}
+
+			if ( rs->sr_err == LDAP_SUCCESS ) {
+				if ( retries > 0 ) {
+					retries--;
+				}
+				goto retry;
+			}
+		}
+
+		assert( lc->lc_refcnt == 1 );
+		lc->lc_refcnt = 0;
+		ldap_back_freeconn( li, lc, dolock );
+		*lcp = NULL;
+		rs->sr_err = slap_map_api2result( rs );
+
+		if ( LDAP_BACK_QUARANTINE( li ) ) {
+			ldap_back_quarantine( op, rs );
+		}
+
+		if ( rs->sr_err != LDAP_SUCCESS &&
+			( sendok & LDAP_BACK_SENDERR ) )
+		{
+			if ( op->o_callback == &cb )
+				op->o_callback = cb.sc_next;
+			op->o_tag = o_tag;
+			rs->sr_text = "Proxy can't contact remote server";
+			send_ldap_result( op, rs );
+			/* if we originally bound and wanted rebind-as-user, must drop
+			 * the connection now because we just discarded the credentials.
+			 * ITS#7464, #8142
+			 */
+			if ( LDAP_BACK_SAVECRED( li ) && SLAP_IS_AUTHZ_BACKEND( op ) )
+				rs->sr_err = SLAPD_DISCONNECT;
+		}
+
+		rc = 0;
+		goto func_leave;
+	}
+
+	rc = ldap_back_op_result( lc, op, rs, msgid,
+		-1, ( sendok | LDAP_BACK_BINDING ) );
+	if ( rc == LDAP_SUCCESS ) {
+		LDAP_BACK_CONN_ISBOUND_SET( lc );
+	}
+
+done:;
+	LDAP_BACK_CONN_BINDING_CLEAR( lc );
+	rc = LDAP_BACK_CONN_ISBOUND( lc );
+	if ( !rc ) {
+		ldap_back_release_conn_lock( li, lcp, dolock );
+
+	} else if ( LDAP_BACK_SAVECRED( li ) ) {
+		ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
+	}
+
+func_leave:;
+	if ( op->o_callback == &cb )
+		op->o_callback = cb.sc_next;
+	op->o_tag = o_tag;
+
+	return rc;
+}
+
+/*
+ * ldap_back_dobind
+ *
+ * Note: dolock indicates whether li->li_conninfo.lai_mutex must be locked or not
+ */
+int
+ldap_back_dobind( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	return ldap_back_dobind_int( lcp, op, rs,
+		( sendok | LDAP_BACK_GETCONN ), li->li_nretries, 1 );
+}
+
+/*
+ * ldap_back_default_rebind
+ *
+ * This is a callback used for chasing referrals using the same
+ * credentials as the original user on this session.
+ */
+int 
+ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
+	ber_int_t msgid, void *params )
+{
+	ldapconn_t	*lc = (ldapconn_t *)params;
+
+#ifdef HAVE_TLS
+	/* ... otherwise we couldn't get here */
+	assert( lc != NULL );
+
+	if ( !ldap_tls_inplace( ld ) ) {
+		int		is_tls = LDAP_BACK_CONN_ISTLS( lc ),
+				rc;
+		const char	*text = NULL;
+
+		rc = ldap_back_start_tls( ld, 0, &is_tls, url, lc->lc_flags,
+			lc->lc_ldapinfo->li_timeout[ SLAP_OP_BIND ], &text );
+		if ( rc != LDAP_SUCCESS ) {
+			return rc;
+		}
+	}
+#endif /* HAVE_TLS */
+
+	/* FIXME: add checks on the URL/identity? */
+	/* TODO: would like to count this bind operation for monitoring
+	 * too, but where do we get the ldapinfo_t? */
+
+	return ldap_sasl_bind_s( ld,
+			BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
+			LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
+}
+
+/*
+ * ldap_back_default_urllist
+ */
+int 
+ldap_back_default_urllist(
+	LDAP		*ld,
+	LDAPURLDesc	**urllist,
+	LDAPURLDesc	**url,
+	void		*params )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)params;
+	LDAPURLDesc	**urltail;
+
+	if ( urllist == url ) {
+		return LDAP_SUCCESS;
+	}
+
+	for ( urltail = &(*url)->lud_next; *urltail; urltail = &(*urltail)->lud_next )
+		/* count */ ;
+
+	*urltail = *urllist;
+	*urllist = *url;
+	*url = NULL;
+
+	if ( !li->li_uri_mutex_do_not_lock ) {
+		ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
+	}
+
+	if ( li->li_uri ) {
+		ch_free( li->li_uri );
+	}
+
+	ldap_get_option( ld, LDAP_OPT_URI, (void *)&li->li_uri );
+
+	if ( !li->li_uri_mutex_do_not_lock ) {
+		ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
+	}
+
+	return LDAP_SUCCESS;
+}
+
+int
+ldap_back_cancel(
+		ldapconn_t		*lc,
+		Operation		*op,
+		SlapReply		*rs,
+		ber_int_t		msgid,
+		ldap_back_send_t	sendok )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	/* default behavior */
+	if ( LDAP_BACK_ABANDON( li ) ) {
+		return ldap_abandon_ext( lc->lc_ld, msgid, NULL, NULL );
+	}
+
+	if ( LDAP_BACK_IGNORE( li ) ) {
+		return ldap_pvt_discard( lc->lc_ld, msgid );
+	}
+
+	if ( LDAP_BACK_CANCEL( li ) ) {
+		/* FIXME: asynchronous? */
+		return ldap_cancel_s( lc->lc_ld, msgid, NULL, NULL );
+	}
+
+	assert( 0 );
+
+	return LDAP_OTHER;
+}
+
+int
+ldap_back_op_result(
+		ldapconn_t		*lc,
+		Operation		*op,
+		SlapReply		*rs,
+		ber_int_t		msgid,
+		time_t			timeout,
+		ldap_back_send_t	sendok )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	char		*match = NULL;
+	char		*text = NULL;
+	char		**refs = NULL;
+	LDAPControl	**ctrls = NULL;
+
+	rs->sr_text = NULL;
+	rs->sr_matched = NULL;
+	rs->sr_ref = NULL;
+	rs->sr_ctrls = NULL;
+
+	/* if the error recorded in the reply corresponds
+	 * to a successful state, get the error from the
+	 * remote server response */
+	if ( LDAP_ERR_OK( rs->sr_err ) ) {
+		int		rc;
+		struct timeval	tv;
+		LDAPMessage	*res = NULL;
+		time_t		stoptime = (time_t)(-1);
+		int		timeout_err = op->o_protocol >= LDAP_VERSION3 ?
+					LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
+		const char	*timeout_text = "Operation timed out";
+
+		/* if timeout is not specified, compute and use
+		 * the one specific to the ongoing operation */
+		if ( timeout == (time_t)(-1) ) {
+			slap_op_t	opidx = slap_req2op( op->o_tag );
+
+			if ( opidx == SLAP_OP_SEARCH ) {
+				if ( op->ors_tlimit <= 0 ) {
+					timeout = 0;
+
+				} else {
+					timeout = op->ors_tlimit;
+					timeout_err = LDAP_TIMELIMIT_EXCEEDED;
+					timeout_text = NULL;
+				}
+
+			} else {
+				timeout = li->li_timeout[ opidx ];
+			}
+		}
+
+		/* better than nothing :) */
+		if ( timeout == 0 ) {
+			if ( li->li_idle_timeout ) {
+				timeout = li->li_idle_timeout;
+
+			} else if ( li->li_conn_ttl ) {
+				timeout = li->li_conn_ttl;
+			}
+		}
+
+		if ( timeout ) {
+			stoptime = op->o_time + timeout;
+		}
+
+		LDAP_BACK_TV_SET( &tv );
+
+retry:;
+		/* if result parsing fails, note the failure reason */
+		rc = ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
+		switch ( rc ) {
+		case 0:
+			if ( timeout && slap_get_time() > stoptime ) {
+				if ( sendok & LDAP_BACK_BINDING ) {
+					ldap_unbind_ext( lc->lc_ld, NULL, NULL );
+					lc->lc_ld = NULL;
+
+					/* let it be used, but taint/delete it so that 
+					 * no-one else can look it up any further */
+					ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+					ldap_back_print_conntree( li, ">>> ldap_back_getconn(timeout)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+
+					(void)ldap_back_conn_delete( li, lc );
+					LDAP_BACK_CONN_TAINTED_SET( lc );
+
+#if LDAP_BACK_PRINT_CONNTREE > 0
+					ldap_back_print_conntree( li, "<<< ldap_back_getconn(timeout)" );
+#endif /* LDAP_BACK_PRINT_CONNTREE */
+					ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+				} else {
+					(void)ldap_back_cancel( lc, op, rs, msgid, sendok );
+				}
+				rs->sr_err = timeout_err;
+				rs->sr_text = timeout_text;
+				break;
+			}
+
+			/* timeout == 0 */
+			LDAP_BACK_TV_SET( &tv );
+			ldap_pvt_thread_yield();
+			goto retry;
+
+		case -1:
+			ldap_get_option( lc->lc_ld, LDAP_OPT_ERROR_NUMBER,
+					&rs->sr_err );
+			break;
+
+
+		/* otherwise get the result; if it is not
+		 * LDAP_SUCCESS, record it in the reply
+		 * structure (this includes 
+		 * LDAP_COMPARE_{TRUE|FALSE}) */
+		default:
+			/* only touch when activity actually took place... */
+			if ( li->li_idle_timeout ) {
+				lc->lc_time = op->o_time;
+			}
+
+			rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
+					&match, &text, &refs, &ctrls, 1 );
+			if ( rc == LDAP_SUCCESS ) {
+				rs->sr_text = text;
+			} else {
+				rs->sr_err = rc;
+			}
+			rs->sr_err = slap_map_api2result( rs );
+
+			/* RFC 4511: referrals can only appear
+			 * if result code is LDAP_REFERRAL */
+			if ( refs != NULL
+				&& refs[ 0 ] != NULL
+				&& refs[ 0 ][ 0 ] != '\0' )
+			{
+				if ( rs->sr_err != LDAP_REFERRAL ) {
+					Debug( LDAP_DEBUG_ANY,
+						"%s ldap_back_op_result: "
+						"got referrals with err=%d\n",
+						op->o_log_prefix,
+						rs->sr_err );
+
+				} else {
+					int	i;
+
+					for ( i = 0; refs[ i ] != NULL; i++ )
+						/* count */ ;
+					rs->sr_ref = op->o_tmpalloc( sizeof( struct berval ) * ( i + 1 ),
+						op->o_tmpmemctx );
+					for ( i = 0; refs[ i ] != NULL; i++ ) {
+						ber_str2bv( refs[ i ], 0, 0, &rs->sr_ref[ i ] );
+					}
+					BER_BVZERO( &rs->sr_ref[ i ] );
+				}
+
+			} else if ( rs->sr_err == LDAP_REFERRAL ) {
+				Debug( LDAP_DEBUG_ANY,
+					"%s ldap_back_op_result: "
+					"got err=%d with null "
+					"or empty referrals\n",
+					op->o_log_prefix,
+					rs->sr_err );
+
+				rs->sr_err = LDAP_NO_SUCH_OBJECT;
+			}
+
+			if ( ctrls != NULL ) {
+				rs->sr_ctrls = ctrls;
+			}
+		}
+	}
+
+	/* if the error in the reply structure is not
+	 * LDAP_SUCCESS, try to map it from client 
+	 * to server error */
+	if ( !LDAP_ERR_OK( rs->sr_err ) ) {
+		rs->sr_err = slap_map_api2result( rs );
+
+		/* internal ops ( op->o_conn == NULL ) 
+		 * must not reply to client */
+		if ( op->o_conn && !op->o_do_not_cache && match ) {
+
+			/* record the (massaged) matched
+			 * DN into the reply structure */
+			rs->sr_matched = match;
+		}
+	}
+
+	if ( rs->sr_err == LDAP_UNAVAILABLE ) {
+		if ( !( sendok & LDAP_BACK_RETRYING ) ) {
+			if ( LDAP_BACK_QUARANTINE( li ) ) {
+				ldap_back_quarantine( op, rs );
+			}
+			if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
+				if ( rs->sr_text == NULL ) rs->sr_text = "Proxy operation retry failed";
+				send_ldap_result( op, rs );
+			}
+		}
+
+	} else if ( op->o_conn &&
+		( ( ( sendok & LDAP_BACK_SENDOK ) && LDAP_ERR_OK( rs->sr_err ) )
+			|| ( ( sendok & LDAP_BACK_SENDERR ) && !LDAP_ERR_OK( rs->sr_err ) ) ) )
+	{
+		send_ldap_result( op, rs );
+	}
+
+	if ( text ) {
+		ldap_memfree( text );
+	}
+	rs->sr_text = NULL;
+
+	/* there can't be refs with a (successful) bind */
+	if ( rs->sr_ref ) {
+		op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
+		rs->sr_ref = NULL;
+	}
+
+	if ( refs ) {
+		ber_memvfree( (void **)refs );
+	}
+
+	/* match should not be possible with a successful bind */
+	if ( match ) {
+		if ( rs->sr_matched != match ) {
+			free( (char *)rs->sr_matched );
+		}
+		rs->sr_matched = NULL;
+		ldap_memfree( match );
+	}
+
+	if ( ctrls != NULL ) {
+		if ( op->o_tag == LDAP_REQ_BIND && rs->sr_err == LDAP_SUCCESS ) {
+			int i;
+
+			for ( i = 0; ctrls[i] != NULL; i++ );
+
+			rs->sr_ctrls = op->o_tmpalloc( sizeof( LDAPControl * )*( i + 1 ),
+				op->o_tmpmemctx );
+			for ( i = 0; ctrls[ i ] != NULL; i++ ) {
+				char *ptr;
+				ber_len_t oidlen = strlen( ctrls[i]->ldctl_oid );
+				ber_len_t size = sizeof( LDAPControl )
+					+ oidlen + 1
+					+ ctrls[i]->ldctl_value.bv_len + 1;
+	
+				rs->sr_ctrls[ i ] = op->o_tmpalloc( size, op->o_tmpmemctx );
+				rs->sr_ctrls[ i ]->ldctl_oid = (char *)&rs->sr_ctrls[ i ][ 1 ];
+				lutil_strcopy( rs->sr_ctrls[ i ]->ldctl_oid, ctrls[i]->ldctl_oid );
+				rs->sr_ctrls[ i ]->ldctl_value.bv_val
+						= (char *)&rs->sr_ctrls[ i ]->ldctl_oid[oidlen + 1];
+				rs->sr_ctrls[ i ]->ldctl_value.bv_len
+					= ctrls[i]->ldctl_value.bv_len;
+				ptr = lutil_memcopy( rs->sr_ctrls[ i ]->ldctl_value.bv_val,
+					ctrls[i]->ldctl_value.bv_val, ctrls[i]->ldctl_value.bv_len );
+				*ptr = '\0';
+			}
+			rs->sr_ctrls[ i ] = NULL;
+			rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
+
+		} else {
+			assert( rs->sr_ctrls != NULL );
+			rs->sr_ctrls = NULL;
+		}
+
+		ldap_controls_free( ctrls );
+	}
+
+	return( LDAP_ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
+}
+
+/* return true if bound, false if failed */
+int
+ldap_back_retry( ldapconn_t **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+	int		rc = 0;
+
+	assert( lcp != NULL );
+	assert( *lcp != NULL );
+
+	ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+
+	if ( (*lcp)->lc_refcnt == 1 ) {
+		int binding = LDAP_BACK_CONN_BINDING( *lcp );
+
+		ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
+		Debug( LDAP_DEBUG_ANY,
+			"%s ldap_back_retry: retrying URI=\"%s\" DN=\"%s\"\n",
+			op->o_log_prefix, li->li_uri,
+			BER_BVISNULL( &(*lcp)->lc_bound_ndn ) ?
+				"" : (*lcp)->lc_bound_ndn.bv_val );
+		ldap_pvt_thread_mutex_unlock( &li->li_uri_mutex );
+
+		ldap_unbind_ext( (*lcp)->lc_ld, NULL, NULL );
+		(*lcp)->lc_ld = NULL;
+		LDAP_BACK_CONN_ISBOUND_CLEAR( (*lcp) );
+
+		/* lc here must be the regular lc, reset and ready for init */
+		rc = ldap_back_prepare_conn( *lcp, op, rs, sendok );
+		if ( rc != LDAP_SUCCESS ) {
+			/* freeit, because lc_refcnt == 1 */
+			(*lcp)->lc_refcnt = 0;
+			(void)ldap_back_freeconn( li, *lcp, 0 );
+			*lcp = NULL;
+			rc = 0;
+
+		} else if ( ( sendok & LDAP_BACK_BINDING ) ) {
+			if ( binding ) {
+				LDAP_BACK_CONN_BINDING_SET( *lcp );
+			}
+			rc = 1;
+
+		} else {
+			rc = ldap_back_dobind_int( lcp, op, rs, sendok, 0, 0 );
+			if ( rc == 0 && *lcp != NULL ) {
+				/* freeit, because lc_refcnt == 1 */
+				(*lcp)->lc_refcnt = 0;
+				(void)ldap_back_freeconn( li, *lcp, 0 );
+				*lcp = NULL;
+			}
+		}
+
+	} else {
+		Debug( LDAP_DEBUG_TRACE,
+			"ldap_back_retry: conn %p refcnt=%u unable to retry.\n",
+			(void *)(*lcp), (*lcp)->lc_refcnt );
+
+		LDAP_BACK_CONN_TAINTED_SET( *lcp );
+		ldap_back_release_conn_lock( li, lcp, 0 );
+		assert( *lcp == NULL );
+
+		if ( sendok & LDAP_BACK_SENDERR ) {
+			rs->sr_err = LDAP_UNAVAILABLE;
+			rs->sr_text = "Unable to retry";
+			send_ldap_result( op, rs );
+		}
+	}
+
+	ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+	return rc;
+}
+
+static int
+ldap_back_is_proxy_authz( Operation *op, SlapReply *rs, ldap_back_send_t sendok,
+	struct berval *binddn, struct berval *bindcred )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+	struct berval	ndn;
+	int		dobind = 0;
+
+	if ( op->o_conn == NULL || op->o_do_not_cache ) {
+		goto done;
+	}
+
+	/* don't proxyAuthz if protocol is not LDAPv3 */
+	switch ( li->li_version ) {
+	case LDAP_VERSION3:
+		break;
+
+	case 0:
+		if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
+			break;
+		}
+		/* fall thru */
+
+	default:
+		rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+		if ( sendok & LDAP_BACK_SENDERR ) {
+			send_ldap_result( op, rs );
+			dobind = -1;
+		}
+		goto done;
+	}
+
+	/* safe default */
+	*binddn = slap_empty_bv;
+	*bindcred = slap_empty_bv;
+
+	if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
+		ndn = op->o_conn->c_ndn;
+
+	} else {
+		ndn = op->o_ndn;
+	}
+
+	if ( !( li->li_idassert_flags & LDAP_BACK_AUTH_OVERRIDE )) {
+		if ( op->o_tag == LDAP_REQ_BIND && ( sendok & LDAP_BACK_SENDERR )) {
+			if ( !BER_BVISEMPTY( &ndn )) {
+				dobind = 0;
+				goto done;
+			}
+		} else if ( SLAP_IS_AUTHZ_BACKEND( op )) {
+			dobind = 0;
+			goto done;
+		}
+	}
+
+	switch ( li->li_idassert_mode ) {
+	case LDAP_BACK_IDASSERT_LEGACY:
+		if ( !BER_BVISNULL( &ndn ) && !BER_BVISEMPTY( &ndn ) ) {
+			if ( !BER_BVISNULL( &li->li_idassert_authcDN ) && !BER_BVISEMPTY( &li->li_idassert_authcDN ) )
+			{
+				*binddn = li->li_idassert_authcDN;
+				*bindcred = li->li_idassert_passwd;
+				dobind = 1;
+			}
+		}
+		break;
+
+	default:
+		/* NOTE: rootdn can always idassert */
+		if ( BER_BVISNULL( &ndn )
+			&& li->li_idassert_authz == NULL
+			&& !( li->li_idassert_flags & LDAP_BACK_AUTH_AUTHZ_ALL ) )
+		{
+			if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
+				rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
+				if ( sendok & LDAP_BACK_SENDERR ) {
+					send_ldap_result( op, rs );
+					dobind = -1;
+				}
+
+			} else {
+				rs->sr_err = LDAP_SUCCESS;
+				*binddn = slap_empty_bv;
+				*bindcred = slap_empty_bv;
+				break;
+			}
+
+			goto done;
+
+		} else if ( !be_isroot( op ) ) {
+			if ( li->li_idassert_passthru ) {
+				struct berval authcDN;
+
+				if ( BER_BVISNULL( &ndn ) ) {
+					authcDN = slap_empty_bv;
+
+				} else {
+					authcDN = ndn;
+				}	
+				rs->sr_err = slap_sasl_matches( op, li->li_idassert_passthru,
+						&authcDN, &authcDN );
+				if ( rs->sr_err == LDAP_SUCCESS ) {
+					dobind = 0;
+					break;
+				}
+			}
+
+			if ( li->li_idassert_authz ) {
+				struct berval authcDN;
+
+				if ( BER_BVISNULL( &ndn ) ) {
+					authcDN = slap_empty_bv;
+
+				} else {
+					authcDN = ndn;
+				}	
+				rs->sr_err = slap_sasl_matches( op, li->li_idassert_authz,
+						&authcDN, &authcDN );
+				if ( rs->sr_err != LDAP_SUCCESS ) {
+					if ( li->li_idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
+						if ( sendok & LDAP_BACK_SENDERR ) {
+							send_ldap_result( op, rs );
+							dobind = -1;
+						}
+
+					} else {
+						rs->sr_err = LDAP_SUCCESS;
+						*binddn = slap_empty_bv;
+						*bindcred = slap_empty_bv;
+						break;
+					}
+
+					goto done;
+				}
+			}
+		}
+
+		*binddn = li->li_idassert_authcDN;
+		*bindcred = li->li_idassert_passwd;
+		dobind = 1;
+		break;
+	}
+
+done:;
+	return dobind;
+}
+
+static int
+ldap_back_proxy_authz_bind(
+	ldapconn_t		*lc,
+	Operation		*op,
+	SlapReply		*rs,
+	ldap_back_send_t	sendok,
+	struct berval		*binddn,
+	struct berval		*bindcred )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+	struct berval	ndn;
+	int		msgid;
+	int		rc;
+
+	if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
+		ndn = op->o_conn->c_ndn;
+
+	} else {
+		ndn = op->o_ndn;
+	}
+
+	if ( li->li_idassert_authmethod == LDAP_AUTH_SASL ) {
+#ifdef HAVE_CYRUS_SASL
+		void		*defaults = NULL;
+		struct berval	authzID = BER_BVNULL;
+		int		freeauthz = 0;
+		LDAPControl **ctrlsp = NULL;
+		LDAPMessage *result = NULL;
+		const char *rmech = NULL;
+		const char *save_text = rs->sr_text;
+
+#ifdef SLAP_AUTH_DN
+		LDAPControl ctrl, *ctrls[2];
+		int msgid;
+#endif /* SLAP_AUTH_DN */
+
+		/* if SASL supports native authz, prepare for it */
+		if ( ( !op->o_do_not_cache || !op->o_is_auth_check ) &&
+				( li->li_idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
+		{
+			switch ( li->li_idassert_mode ) {
+			case LDAP_BACK_IDASSERT_OTHERID:
+			case LDAP_BACK_IDASSERT_OTHERDN:
+				authzID = li->li_idassert_authzID;
+				break;
+
+			case LDAP_BACK_IDASSERT_ANONYMOUS:
+				BER_BVSTR( &authzID, "dn:" );
+				break;
+
+			case LDAP_BACK_IDASSERT_SELF:
+				if ( BER_BVISNULL( &ndn ) ) {
+					/* connection is not authc'd, so don't idassert */
+					BER_BVSTR( &authzID, "dn:" );
+					break;
+				}
+				authzID.bv_len = STRLENOF( "dn:" ) + ndn.bv_len;
+				authzID.bv_val = slap_sl_malloc( authzID.bv_len + 1, op->o_tmpmemctx );
+				AC_MEMCPY( authzID.bv_val, "dn:", STRLENOF( "dn:" ) );
+				AC_MEMCPY( authzID.bv_val + STRLENOF( "dn:" ),
+						ndn.bv_val, ndn.bv_len + 1 );
+				freeauthz = 1;
+				break;
+
+			default:
+				break;
+			}
+		}
+
+		if ( li->li_idassert_secprops != NULL ) {
+			rs->sr_err = ldap_set_option( lc->lc_ld,
+				LDAP_OPT_X_SASL_SECPROPS,
+				(void *)li->li_idassert_secprops );
+
+			if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
+				rs->sr_err = LDAP_OTHER;
+				if ( sendok & LDAP_BACK_SENDERR ) {
+					send_ldap_result( op, rs );
+				}
+				LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+				goto done;
+			}
+		}
+
+		defaults = lutil_sasl_defaults( lc->lc_ld,
+				li->li_idassert_sasl_mech.bv_val,
+				li->li_idassert_sasl_realm.bv_val,
+				li->li_idassert_authcID.bv_val,
+				li->li_idassert_passwd.bv_val,
+				authzID.bv_val );
+		if ( defaults == NULL ) {
+			rs->sr_err = LDAP_OTHER;
+			LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+			if ( sendok & LDAP_BACK_SENDERR ) {
+				send_ldap_result( op, rs );
+			}
+			goto done;
+		}
+
+#ifdef SLAP_AUTH_DN
+		if ( li->li_idassert_flags & LDAP_BACK_AUTH_DN_AUTHZID ) {
+			assert( BER_BVISNULL( binddn ) );
+
+			ctrl.ldctl_oid = LDAP_CONTROL_AUTHZID_REQUEST;
+			ctrl.ldctl_iscritical = 0;
+			BER_BVZERO( &ctrl.ldctl_value );
+			ctrls[0] = &ctrl;
+			ctrls[1] = NULL;
+			ctrlsp = ctrls;
+		}
+#endif /* SLAP_AUTH_DN */
+
+		do {
+			rs->sr_err = ldap_sasl_interactive_bind( lc->lc_ld, binddn->bv_val,
+				li->li_idassert_sasl_mech.bv_val, 
+				ctrlsp, NULL, LDAP_SASL_QUIET, lutil_sasl_interact, defaults,
+				result, &rmech, &msgid );
+
+			if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS )
+				break;
+
+			ldap_msgfree( result );
+
+			if ( ldap_result( lc->lc_ld, msgid, LDAP_MSG_ALL, NULL, &result ) == -1 || !result ) {
+				ldap_get_option( lc->lc_ld, LDAP_OPT_RESULT_CODE, (void*)&rs->sr_err );
+				ldap_get_option( lc->lc_ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&rs->sr_text );
+				break;
+			}
+		} while ( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
+
+		ldap_pvt_thread_mutex_lock( &li->li_counter_mutex );
+		ldap_pvt_mp_add( li->li_ops_completed[ SLAP_OP_BIND ], 1 );
+		ldap_pvt_thread_mutex_unlock( &li->li_counter_mutex );
+
+		switch ( rs->sr_err ) {
+		case LDAP_SUCCESS:
+#ifdef SLAP_AUTH_DN
+			/* FIXME: right now, the only reason to check
+			 * response controls is RFC 3829 authzid */
+			if ( li->li_idassert_flags & LDAP_BACK_AUTH_DN_AUTHZID ) {
+				ctrlsp = NULL;
+				rc = ldap_parse_result( lc->lc_ld, result, NULL, NULL, NULL, NULL,
+					&ctrlsp, 0 );
+				if ( rc == LDAP_SUCCESS && ctrlsp ) {
+					LDAPControl *ctrl;
+		
+					ctrl = ldap_control_find( LDAP_CONTROL_AUTHZID_RESPONSE,
+						ctrlsp, NULL );
+					if ( ctrl ) {
+						Debug( LDAP_DEBUG_TRACE, "%s: ldap_back_proxy_authz_bind: authzID=\"%s\" (authzid)\n",
+							op->o_log_prefix, ctrl->ldctl_value.bv_val );
+						if ( ctrl->ldctl_value.bv_len > STRLENOF("dn:") &&
+							strncasecmp( ctrl->ldctl_value.bv_val, "dn:", STRLENOF("dn:") ) == 0 )
+						{
+							struct berval bv;
+							bv.bv_val = &ctrl->ldctl_value.bv_val[STRLENOF("dn:")];
+							bv.bv_len = ctrl->ldctl_value.bv_len - STRLENOF("dn:");
+							ber_bvreplace( &lc->lc_bound_ndn, &bv );
+						}
+					}
+				}
+
+				ldap_controls_free( ctrlsp );
+
+			} else if ( li->li_idassert_flags & LDAP_BACK_AUTH_DN_WHOAMI ) {
+				struct berval *val = NULL;
+				rc = ldap_whoami_s( lc->lc_ld, &val, NULL, NULL );
+				if ( rc == LDAP_SUCCESS && val != NULL ) {
+					Debug( LDAP_DEBUG_TRACE, "%s: ldap_back_proxy_authz_bind: authzID=\"%s\" (whoami)\n",
+						op->o_log_prefix, val->bv_val );
+					if ( val->bv_len > STRLENOF("dn:") &&
+						strncasecmp( val->bv_val, "dn:", STRLENOF("dn:") ) == 0 )
+					{
+						struct berval bv;
+						bv.bv_val = &val->bv_val[STRLENOF("dn:")];
+						bv.bv_len = val->bv_len - STRLENOF("dn:");
+						ber_bvreplace( &lc->lc_bound_ndn, &bv );
+					}
+					ber_bvfree( val );
+				}
+			}
+
+			if ( ( li->li_idassert_flags & LDAP_BACK_AUTH_DN_MASK ) &&
+				BER_BVISNULL( &lc->lc_bound_ndn ) )
+			{
+				/* all in all, we only need it to be non-null */
+				/* FIXME: should this be configurable? */
+				static struct berval bv = BER_BVC("cn=authzdn");
+				ber_bvreplace( &lc->lc_bound_ndn, &bv );
+			}
+#endif /* SLAP_AUTH_DN */
+			LDAP_BACK_CONN_ISBOUND_SET( lc );
+			break;
+
+		case LDAP_LOCAL_ERROR:
+			/* list client API error codes that require
+			 * to taint the connection */
+			/* FIXME: should actually retry? */
+			LDAP_BACK_CONN_TAINTED_SET( lc );
+
+			/* fallthru */
+
+		default:
+			LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+			rs->sr_err = slap_map_api2result( rs );
+			if ( sendok & LDAP_BACK_SENDERR ) {
+				send_ldap_result( op, rs );
+			}
+			break;
+		}
+
+		if ( save_text != rs->sr_text ) {
+			ldap_memfree( (char *)rs->sr_text );
+			rs->sr_text = save_text;
+		}
+
+		ldap_msgfree( result );
+
+		lutil_sasl_freedefs( defaults );
+		if ( freeauthz ) {
+			slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
+		}
+
+		goto done;
+#endif /* HAVE_CYRUS_SASL */
+	}
+
+	switch ( li->li_idassert_authmethod ) {
+	case LDAP_AUTH_NONE:
+		/* FIXME: do we really need this? */
+		BER_BVSTR( binddn, "" );
+		BER_BVSTR( bindcred, "" );
+		/* fallthru */
+
+	case LDAP_AUTH_SIMPLE:
+		rs->sr_err = ldap_sasl_bind( lc->lc_ld,
+				binddn->bv_val, LDAP_SASL_SIMPLE,
+				bindcred, NULL, NULL, &msgid );
+		rc = ldap_back_op_result( lc, op, rs, msgid,
+			-1, ( sendok | LDAP_BACK_BINDING ) );
+
+		ldap_pvt_thread_mutex_lock( &li->li_counter_mutex );
+		ldap_pvt_mp_add( li->li_ops_completed[ SLAP_OP_BIND ], 1 );
+		ldap_pvt_thread_mutex_unlock( &li->li_counter_mutex );
+		break;
+
+	default:
+		/* unsupported! */
+		LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
+		rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
+		if ( sendok & LDAP_BACK_SENDERR ) {
+			send_ldap_result( op, rs );
+		}
+		goto done;
+	}
+
+	if ( rc == LDAP_SUCCESS ) {
+		/* set rebind stuff in case of successful proxyAuthz bind,
+		 * so that referral chasing is attempted using the right
+		 * identity */
+		LDAP_BACK_CONN_ISBOUND_SET( lc );
+		if ( !BER_BVISNULL( binddn ) ) {
+			ber_bvreplace( &lc->lc_bound_ndn, binddn );
+		}
+
+		if ( !BER_BVISNULL( &lc->lc_cred ) ) {
+			memset( lc->lc_cred.bv_val, 0,
+					lc->lc_cred.bv_len );
+		}
+
+		if ( LDAP_BACK_SAVECRED( li ) ) {
+			if ( !BER_BVISNULL( bindcred ) ) {
+				ber_bvreplace( &lc->lc_cred, bindcred );
+				ldap_set_rebind_proc( lc->lc_ld, li->li_rebind_f, lc );
+			}
+
+		} else {
+			lc->lc_cred.bv_len = 0;
+		}
+	}
+
+done:;
+	return LDAP_BACK_CONN_ISBOUND( lc );
+}
+
+/*
+ * ldap_back_proxy_authz_ctrl() prepends a proxyAuthz control
+ * to existing server-side controls if required; if not,
+ * the existing server-side controls are placed in *pctrls.
+ * The caller, after using the controls in client API 
+ * operations, if ( *pctrls != op->o_ctrls ), should
+ * free( (*pctrls)[ 0 ] ) and free( *pctrls ).
+ * The function returns success if the control could
+ * be added if required, or if it did nothing; in the future,
+ * it might return some error if it failed.
+ * 
+ * if no bind took place yet, but the connection is bound
+ * and the "proxyauthzdn" is set, then bind as "proxyauthzdn" 
+ * and explicitly add proxyAuthz the control to every operation
+ * with the dn bound to the connection as control value.
+ *
+ * If no server-side controls are defined for the operation,
+ * simply add the proxyAuthz control; otherwise, if the
+ * proxyAuthz control is not already set, add it as
+ * the first one
+ *
+ * FIXME: is controls order significant for security?
+ * ANSWER: controls ordering and interoperability
+ * must be indicated by the specs of each control; if none
+ * is specified, the order is irrelevant.
+ */
+int
+ldap_back_proxy_authz_ctrl(
+		Operation	*op,
+		SlapReply	*rs,
+		struct berval	*bound_ndn,
+		int		version,
+		slap_idassert_t	*si,
+		LDAPControl	*ctrl )
+{
+	slap_idassert_mode_t	mode;
+	struct berval		assertedID,
+				ndn;
+	int			isroot = 0;
+
+	rs->sr_err = SLAP_CB_CONTINUE;
+
+	/* FIXME: SASL/EXTERNAL over ldapi:// doesn't honor the authcID,
+	 * but if it is not set this test fails.  We need a different
+	 * means to detect if idassert is enabled */
+	if ( ( BER_BVISNULL( &si->si_bc.sb_authcId ) || BER_BVISEMPTY( &si->si_bc.sb_authcId ) )
+		&& ( BER_BVISNULL( &si->si_bc.sb_binddn ) || BER_BVISEMPTY( &si->si_bc.sb_binddn ) )
+		&& BER_BVISNULL( &si->si_bc.sb_saslmech ) )
+	{
+		goto done;
+	}
+
+	if ( !op->o_conn || op->o_do_not_cache || ( isroot = be_isroot( op ) ) ) {
+		goto done;
+	}
+
+	if ( op->o_tag == LDAP_REQ_BIND ) {
+		ndn = op->o_req_ndn;
+	} else {
+		ndn = op->o_ndn;
+	}
+
+	if ( si->si_mode == LDAP_BACK_IDASSERT_LEGACY ) {
+		if ( op->o_proxy_authz ) {
+			/*
+			 * FIXME: we do not want to perform proxyAuthz
+			 * on behalf of the client, because this would
+			 * be performed with "proxyauthzdn" privileges.
+			 *
+			 * This might actually be too strict, since
+			 * the "proxyauthzdn" authzTo, and each entry's
+			 * authzFrom attributes may be crafted
+			 * to avoid unwanted proxyAuthz to take place.
+			 */
+#if 0
+			rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+			rs->sr_text = "proxyAuthz not allowed within namingContext";
+#endif
+			goto done;
+		}
+
+		if ( !BER_BVISNULL( bound_ndn ) ) {
+			goto done;
+		}
+
+		if ( BER_BVISNULL( &ndn ) ) {
+			goto done;
+		}
+
+		if ( BER_BVISNULL( &si->si_bc.sb_binddn ) ) {
+			goto done;
+		}
+
+	} else if ( si->si_bc.sb_method == LDAP_AUTH_SASL ) {
+		if ( ( si->si_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
+		{
+			/* already asserted in SASL via native authz */
+			goto done;
+		}
+
+	} else if ( si->si_authz && !isroot ) {
+		int		rc;
+		struct berval authcDN;
+
+		if ( BER_BVISNULL( &ndn ) ) {
+			authcDN = slap_empty_bv;
+		} else {
+			authcDN = ndn;
+		}
+		rc = slap_sasl_matches( op, si->si_authz,
+				&authcDN, &authcDN );
+		if ( rc != LDAP_SUCCESS ) {
+			if ( si->si_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
+				/* ndn is not authorized
+				 * to use idassert */
+				rs->sr_err = rc;
+			}
+			goto done;
+		}
+	}
+
+	if ( op->o_proxy_authz ) {
+		/*
+		 * FIXME: we can:
+		 * 1) ignore the already set proxyAuthz control
+		 * 2) leave it in place, and don't set ours
+		 * 3) add both
+		 * 4) reject the operation
+		 *
+		 * option (4) is very drastic
+		 * option (3) will make the remote server reject
+		 * the operation, thus being equivalent to (4)
+		 * option (2) will likely break the idassert
+		 * assumptions, so we cannot accept it;
+		 * option (1) means that we are contradicting
+		 * the client's request.
+		 *
+		 * I think (4) is the only correct choice.
+		 */
+		rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+		rs->sr_text = "proxyAuthz not allowed within namingContext";
+	}
+
+	if ( op->o_is_auth_check ) {
+		mode = LDAP_BACK_IDASSERT_NOASSERT;
+
+	} else {
+		mode = si->si_mode;
+	}
+
+	switch ( mode ) {
+	case LDAP_BACK_IDASSERT_LEGACY:
+		/* original behavior:
+		 * assert the client's identity */
+	case LDAP_BACK_IDASSERT_SELF:
+		assertedID = ndn;
+		break;
+
+	case LDAP_BACK_IDASSERT_ANONYMOUS:
+		/* assert "anonymous" */
+		assertedID = slap_empty_bv;
+		break;
+
+	case LDAP_BACK_IDASSERT_NOASSERT:
+		/* don't assert; bind as proxyauthzdn */
+		goto done;
+
+	case LDAP_BACK_IDASSERT_OTHERID:
+	case LDAP_BACK_IDASSERT_OTHERDN:
+		/* assert idassert DN */
+		assertedID = si->si_bc.sb_authzId;
+		break;
+
+	default:
+		assert( 0 );
+	}
+
+	/* if we got here, "" is allowed to proxyAuthz */
+	if ( BER_BVISNULL( &assertedID ) ) {
+		assertedID = slap_empty_bv;
+	}
+
+	/* don't idassert the bound DN (ITS#4497) */
+	if ( dn_match( &assertedID, bound_ndn ) ) {
+		goto done;
+	}
+
+	ctrl->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
+	ctrl->ldctl_iscritical = ( ( si->si_flags & LDAP_BACK_AUTH_PROXYAUTHZ_CRITICAL ) == LDAP_BACK_AUTH_PROXYAUTHZ_CRITICAL );
+
+	switch ( si->si_mode ) {
+	/* already in u:ID or dn:DN form */
+	case LDAP_BACK_IDASSERT_OTHERID:
+	case LDAP_BACK_IDASSERT_OTHERDN:
+		ber_dupbv_x( &ctrl->ldctl_value, &assertedID, op->o_tmpmemctx );
+		rs->sr_err = LDAP_SUCCESS;
+		break;
+
+	/* needs the dn: prefix */
+	default:
+		ctrl->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
+		ctrl->ldctl_value.bv_val = op->o_tmpalloc( ctrl->ldctl_value.bv_len + 1,
+				op->o_tmpmemctx );
+		AC_MEMCPY( ctrl->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
+		AC_MEMCPY( &ctrl->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
+				assertedID.bv_val, assertedID.bv_len + 1 );
+		rs->sr_err = LDAP_SUCCESS;
+		break;
+	}
+
+	/* Older versions of <draft-weltman-ldapv3-proxy> required
+	 * to encode the value of the authzID (and called it proxyDN);
+	 * this hack provides compatibility with those DSAs that
+	 * implement it this way */
+	if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_ENCODING_WORKAROUND ) {
+		struct berval		authzID = ctrl->ldctl_value;
+		BerElementBuffer	berbuf;
+		BerElement		*ber = (BerElement *)&berbuf;
+		ber_tag_t		tag;
+
+		ber_init2( ber, 0, LBER_USE_DER );
+		ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
+
+		tag = ber_printf( ber, "O", &authzID );
+		if ( tag == LBER_ERROR ) {
+			rs->sr_err = LDAP_OTHER;
+			goto free_ber;
+		}
+
+		if ( ber_flatten2( ber, &ctrl->ldctl_value, 1 ) == -1 ) {
+			rs->sr_err = LDAP_OTHER;
+			goto free_ber;
+		}
+
+		rs->sr_err = LDAP_SUCCESS;
+
+free_ber:;
+		op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
+		ber_free_buf( ber );
+
+		if ( rs->sr_err != LDAP_SUCCESS ) {
+			goto done;
+		}
+
+	} else if ( si->si_flags & LDAP_BACK_AUTH_OBSOLETE_PROXY_AUTHZ ) {
+		struct berval		authzID = ctrl->ldctl_value,
+					tmp;
+		BerElementBuffer	berbuf;
+		BerElement		*ber = (BerElement *)&berbuf;
+		ber_tag_t		tag;
+
+		if ( strncasecmp( authzID.bv_val, "dn:", STRLENOF( "dn:" ) ) != 0 ) {
+			rs->sr_err = LDAP_PROTOCOL_ERROR;
+			goto done;
+		}
+
+		tmp = authzID;
+		tmp.bv_val += STRLENOF( "dn:" );
+		tmp.bv_len -= STRLENOF( "dn:" );
+
+		ber_init2( ber, 0, LBER_USE_DER );
+		ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
+
+		/* apparently, Mozilla API encodes this
+		 * as "SEQUENCE { LDAPDN }" */
+		tag = ber_printf( ber, "{O}", &tmp );
+		if ( tag == LBER_ERROR ) {
+			rs->sr_err = LDAP_OTHER;
+			goto free_ber2;
+		}
+
+		if ( ber_flatten2( ber, &ctrl->ldctl_value, 1 ) == -1 ) {
+			rs->sr_err = LDAP_OTHER;
+			goto free_ber2;
+		}
+
+		ctrl->ldctl_oid = LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ;
+		rs->sr_err = LDAP_SUCCESS;
+
+free_ber2:;
+		op->o_tmpfree( authzID.bv_val, op->o_tmpmemctx );
+		ber_free_buf( ber );
+
+		if ( rs->sr_err != LDAP_SUCCESS ) {
+			goto done;
+		}
+	}
+
+done:;
+
+	return rs->sr_err;
+}
+
+/*
+ * Add controls;
+ *
+ * if any needs to be added, it is prepended to existing ones,
+ * in a newly allocated array.  The companion function
+ * ldap_back_controls_free() must be used to restore the original
+ * status of op->o_ctrls.
+ */
+int
+ldap_back_controls_add(
+		Operation	*op,
+		SlapReply	*rs,
+		ldapconn_t	*lc,
+		LDAPControl	***pctrls )
+{
+	ldapinfo_t	*li = (ldapinfo_t *)op->o_bd->be_private;
+
+	LDAPControl	**ctrls = NULL;
+	/* set to the maximum number of controls this backend can add */
+	LDAPControl	c[ 2 ] = { { 0 } };
+	int		n = 0, i, j1 = 0, j2 = 0, skipped = 0;
+
+	*pctrls = NULL;
+
+	rs->sr_err = LDAP_SUCCESS;
+
+	/* don't add controls if protocol is not LDAPv3 */
+	switch ( li->li_version ) {
+	case LDAP_VERSION3:
+		break;
+
+	case 0:
+		if ( op->o_protocol == 0 || op->o_protocol == LDAP_VERSION3 ) {
+			break;
+		}
+		/* fall thru */
+
+	default:
+		goto done;
+	}
+
+	/* put controls that go __before__ existing ones here */
+
+	/* proxyAuthz for identity assertion */
+	switch ( ldap_back_proxy_authz_ctrl( op, rs, &lc->lc_bound_ndn,
+		li->li_version, &li->li_idassert, &c[ j1 ] ) )
+	{
+	case SLAP_CB_CONTINUE:
+		break;
+
+	case LDAP_SUCCESS:
+		j1++;
+		break;
+
+	default:
+		goto done;
+	}
+
+	/* put controls that go __after__ existing ones here */
+
+#ifdef SLAP_CONTROL_X_SESSION_TRACKING
+	/* FIXME: according to <draft-wahl-ldap-session>, 
+	 * the server should check if the control can be added
+	 * based on the identity of the client and so */
+
+	/* session tracking */
+	if ( LDAP_BACK_ST_REQUEST( li ) ) {
+		switch ( slap_ctrl_session_tracking_request_add( op, rs, &c[ j1 + j2 ] ) ) {
+		case SLAP_CB_CONTINUE:
+			break;
+
+		case LDAP_SUCCESS:
+			j2++;
+			break;
+
+		default:
+			goto done;
+		}
+	}
+#endif /* SLAP_CONTROL_X_SESSION_TRACKING */
+
+	if ( rs->sr_err == SLAP_CB_CONTINUE ) {
+		rs->sr_err = LDAP_SUCCESS;
+	}
+
+	/* if nothing to do, just bail out */
+	if ( j1 == 0 && j2 == 0 ) {
+		goto done;
+	}
+
+	assert( j1 + j2 <= (int) (sizeof( c )/sizeof( c[0] )) );
+
+	if ( op->o_ctrls ) {
+		for ( n = 0; op->o_ctrls[ n ]; n++ )
+			/* just count ctrls */ ;
+	}
+
+	ctrls = op->o_tmpalloc( (n + j1 + j2 + 1) * sizeof( LDAPControl * ) + ( j1 + j2 ) * sizeof( LDAPControl ),
+			op->o_tmpmemctx );
+	if ( j1 ) {
+		ctrls[ 0 ] = (LDAPControl *)&ctrls[ n + j1 + j2 + 1 ];
+		*ctrls[ 0 ] = c[ 0 ];
+		for ( i = 1; i < j1; i++ ) {
+			ctrls[ i ] = &ctrls[ 0 ][ i ];
+			*ctrls[ i ] = c[ i ];
+		}
+	}
+
+	i = 0;
+	if ( op->o_ctrls ) {
+		LDAPControl *proxyauthz = ldap_control_find(
+				LDAP_CONTROL_PROXY_AUTHZ, op->o_ctrls, NULL );
+
+		for ( i = 0; op->o_ctrls[ i ]; i++ ) {
+			/* Only replace it if we generated one */
+			if ( j1 && proxyauthz && proxyauthz == op->o_ctrls[ i ] ) {
+				/* Frontend has already checked only one is present */
+				assert( skipped == 0 );
+				skipped++;
+				continue;
+			}
+			ctrls[ i + j1 - skipped ] = op->o_ctrls[ i ];
+		}
+	}
+
+	n += j1 - skipped;
+	if ( j2 ) {
+		ctrls[ n ] = (LDAPControl *)&ctrls[ n + j2 + 1 ] + j1;
+		*ctrls[ n ] = c[ j1 ];
+		for ( i = 1; i < j2; i++ ) {
+			ctrls[ n + i ] = &ctrls[ n ][ i ];
+			*ctrls[ n + i ] = c[ i ];
+		}
+	}
+
+	ctrls[ n + j2 ] = NULL;
+
+done:;
+	if ( ctrls == NULL ) {
+		ctrls = op->o_ctrls;
+	}
+
+	*pctrls = ctrls;
+	
+	return rs->sr_err;
+}
+
+int
+ldap_back_controls_free( Operation *op, SlapReply *rs, LDAPControl ***pctrls )
+{
+	LDAPControl	**ctrls = *pctrls;
+
+	/* we assume that the controls added by the proxy come first,
+	 * so as soon as we find op->o_ctrls[ 0 ] we can stop */
+	if ( ctrls && ctrls != op->o_ctrls ) {
+		int		i = 0, n = 0, n_added;
+		LDAPControl	*lower, *upper;
+
+		assert( ctrls[ 0 ] != NULL );
+
+		for ( n = 0; ctrls[ n ] != NULL; n++ )
+			/* count 'em */ ;
+
+		if ( op->o_ctrls ) {
+			for ( i = 0; op->o_ctrls[ i ] != NULL; i++ )
+				/* count 'em */ ;
+		}
+
+		n_added = n - i;
+		lower = (LDAPControl *)&ctrls[ n ];
+		upper = &lower[ n_added ];
+
+		for ( i = 0; ctrls[ i ] != NULL; i++ ) {
+			if ( ctrls[ i ] < lower || ctrls[ i ] >= upper ) {
+				/* original; don't touch */
+				continue;
+			}
+
+			if ( !BER_BVISNULL( &ctrls[ i ]->ldctl_value ) ) {
+				op->o_tmpfree( ctrls[ i ]->ldctl_value.bv_val, op->o_tmpmemctx );
+			}
+		}
+
+		op->o_tmpfree( ctrls, op->o_tmpmemctx );
+	} 
+
+	*pctrls = NULL;
+
+	return 0;
+}
+
+int
+ldap_back_conn2str( const ldapconn_base_t *lc, char *buf, ber_len_t buflen )
+{
+	char tbuf[ SLAP_TEXT_BUFLEN ];
+	char *ptr = buf, *end = buf + buflen;
+	int len;
+
+	if ( ptr + sizeof("conn=") > end ) return -1;
+	ptr = lutil_strcopy( ptr, "conn=" );
+
+	len = ldap_back_connid2str( lc, ptr, (ber_len_t)(end - ptr) );
+	ptr += len;
+	if ( ptr >= end ) return -1;
+
+	if ( !BER_BVISNULL( &lc->lcb_local_ndn ) ) {
+		if ( ptr + sizeof(" DN=\"\"") + lc->lcb_local_ndn.bv_len > end ) return -1;
+		ptr = lutil_strcopy( ptr, " DN=\"" );
+		ptr = lutil_strncopy( ptr, lc->lcb_local_ndn.bv_val, lc->lcb_local_ndn.bv_len );
+		*ptr++ = '"';
+	}
+
+	if ( lc->lcb_create_time != 0 ) {
+		len = snprintf( tbuf, sizeof(tbuf), "%ld", lc->lcb_create_time );
+		if ( ptr + sizeof(" created=") + len >= end ) return -1;
+		ptr = lutil_strcopy( ptr, " created=" );
+		ptr = lutil_strcopy( ptr, tbuf );
+	}
+
+	if ( lc->lcb_time != 0 ) {
+		len = snprintf( tbuf, sizeof(tbuf), "%ld", lc->lcb_time );
+		if ( ptr + sizeof(" modified=") + len >= end ) return -1;
+		ptr = lutil_strcopy( ptr, " modified=" );
+		ptr = lutil_strcopy( ptr, tbuf );
+	}
+
+	len = snprintf( tbuf, sizeof(tbuf), "%u", lc->lcb_refcnt );
+	if ( ptr + sizeof(" refcnt=") + len >= end ) return -1;
+	ptr = lutil_strcopy( ptr, " refcnt=" );
+	ptr = lutil_strcopy( ptr, tbuf );
+
+	return ptr - buf;
+}
+
+int
+ldap_back_connid2str( const ldapconn_base_t *lc, char *buf, ber_len_t buflen )
+{
+	static struct berval conns[] = {
+		BER_BVC("ROOTDN"),
+		BER_BVC("ROOTDN-TLS"),
+		BER_BVC("ANON"),
+		BER_BVC("ANON-TLS"),
+		BER_BVC("BIND"),
+		BER_BVC("BIND-TLS"),
+		BER_BVNULL
+	};
+
+	int len = 0;
+
+	if ( LDAP_BACK_PCONN_ISPRIV( (const ldapconn_t *)lc ) ) {
+		long cid;
+		struct berval *bv;
+
+		cid = (long)lc->lcb_conn;
+		assert( cid >= LDAP_BACK_PCONN_FIRST && cid < LDAP_BACK_PCONN_LAST );
+
+		bv = &conns[ cid ];
+
+		if ( bv->bv_len >= buflen ) {
+			return bv->bv_len + 1;
+		}
+
+		len = bv->bv_len;
+		lutil_strncopy( buf, bv->bv_val, bv->bv_len + 1 );
+
+	} else {
+		len = snprintf( buf, buflen, "%lu", lc->lcb_conn->c_connid );
+	}
+
+	return len;
+}
+
+void *
+ldap_back_conn_expire_fn( void *ctx, void *arg )
+{
+	struct re_s *rtask = arg;
+	ldapinfo_t *li = (ldapinfo_t *)rtask->arg;
+	ldap_back_conn_prune( li );
+
+	return NULL;
+}
+
+/* Pick which expires first: connection TTL or idle timeout */
+static time_t
+ldap_back_conn_expire_time( ldapinfo_t *li, ldapconn_t *lc) {
+	if ( li->li_conn_ttl != 0 && li->li_idle_timeout != 0 ) {
+		return ( lc->lc_create_time + li->li_conn_ttl ) < ( lc->lc_time + li->li_idle_timeout ) ?
+			( lc->lc_create_time + li->li_conn_ttl ) : ( lc->lc_time + li->li_idle_timeout );
+	} else if ( li->li_conn_ttl != 0 ) {
+		return lc->lc_create_time + li->li_conn_ttl;
+	} else if ( li->li_idle_timeout != 0 ) {
+		return lc->lc_time + li->li_idle_timeout;
+	}
+	return -1;
+}
+
+static void
+ldap_back_conn_prune( ldapinfo_t *li )
+{
+	time_t		now = slap_get_time();
+	time_t 		next_timeout = -1; /* -1 means uninitialized */
+	TAvlnode	*edge;
+	int		c;
+
+	/*
+	 * Iterate though connections and close those that are pass the expiry time.
+	 * Also calculate the time for next connection to to expire.
+	 */
+	ldap_pvt_thread_mutex_lock( &li->li_conninfo.lai_mutex );
+
+	for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) {
+		ldapconn_t *lc = LDAP_TAILQ_FIRST( &li->li_conn_priv[ c ].lic_priv );
+
+		while ( lc ) {
+			ldapconn_t *next = LDAP_TAILQ_NEXT( lc, lc_q );
+			time_t conn_expires = ldap_back_conn_expire_time( li, lc );
+
+			if ( now >= conn_expires ) {
+				if ( lc->lc_refcnt == 0 ) {
+					Debug( LDAP_DEBUG_TRACE,
+						"ldap_back_conn_prune: closing expired connection lc=%p\n",
+						lc );
+					ldap_back_freeconn( li, lc, 0 );
+				} else {
+					Debug( LDAP_DEBUG_TRACE,
+						"ldap_back_conn_prune: tainting expired connection lc=%p\n",
+						lc );
+					LDAP_BACK_CONN_TAINTED_SET( lc );
+				}
+			} else if ( next_timeout == -1 || conn_expires < next_timeout ) {
+				/* next_timeout was not yet initialized or current connection expires sooner */
+				next_timeout = conn_expires;
+			}
+
+			lc = next;
+		}
+	}
+
+	edge = ldap_tavl_end( li->li_conninfo.lai_tree, TAVL_DIR_LEFT );
+	while ( edge ) {
+		TAvlnode *next = ldap_tavl_next( edge, TAVL_DIR_RIGHT );
+		ldapconn_t *lc = (ldapconn_t *)edge->avl_data;
+		time_t conn_expires = ldap_back_conn_expire_time( li, lc );
+
+		if ( now >= conn_expires ) {
+			if ( lc->lc_refcnt == 0 ) {
+				Debug( LDAP_DEBUG_TRACE,
+					"ldap_back_conn_prune: closing expired connection lc=%p\n",
+					lc );
+				ldap_back_freeconn( li, lc, 0 );
+			} else {
+				Debug( LDAP_DEBUG_TRACE,
+					"ldap_back_conn_prune: tainting expired connection lc=%p\n",
+					lc );
+				LDAP_BACK_CONN_TAINTED_SET( lc );
+			}
+		} else if ( next_timeout == -1 || conn_expires < next_timeout ) {
+			next_timeout = conn_expires;
+		}
+
+		edge = next;
+	}
+
+	ldap_pvt_thread_mutex_unlock( &li->li_conninfo.lai_mutex );
+
+	/* Reschedule for next timeout or cancel the task */
+	ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
+	if ( next_timeout > 0 ) {
+		if ( ldap_pvt_runqueue_isrunning( &slapd_rq, li->li_conn_expire_task ) ) {
+			ldap_pvt_runqueue_stoptask( &slapd_rq, li->li_conn_expire_task );
+		}
+		li->li_conn_expire_task->interval.tv_sec = next_timeout - now;
+		ldap_pvt_runqueue_resched( &slapd_rq, li->li_conn_expire_task, 0 );
+
+		/*
+		 * The thread that handles runqueue might have already processed all tasks
+		 * before we insertered new task or rescheduled the existing task with new
+		 * timeout period. Wake it up to ensure that the task will be picked up.
+		 */
+		slap_wake_listener();
+		Debug( LDAP_DEBUG_TRACE,
+			"ldap_back_conn_prune: scheduled connection expiry timer to %ld sec\n",
+			li->li_conn_expire_task->interval.tv_sec );
+	} else if ( next_timeout == -1 && li->li_conn_expire_task != NULL ) {
+		if ( ldap_pvt_runqueue_isrunning( &slapd_rq, li->li_conn_expire_task ) ) {
+			ldap_pvt_runqueue_stoptask( &slapd_rq, li->li_conn_expire_task );
+		}
+		ldap_pvt_runqueue_remove( &slapd_rq, li->li_conn_expire_task );
+		li->li_conn_expire_task = NULL;
+	}
+	ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
+
+	return;
+}
+
+static void
+ldap_back_schedule_conn_expiry( ldapinfo_t *li, ldapconn_t *lc ) {
+	/* Do nothing if timeouts are not set. */
+	if ( li->li_conn_ttl == 0 && li->li_idle_timeout == 0 ) {
+		return;
+	}
+
+	/*
+	 * If connection expire task is not running, create it and schedule for
+	 * timeout of this connection.
+	 *
+	 * If the task is already running, this connection cannot be next one
+	 * to expire and therefore timeout does not need to be re-calculated.
+	 */
+	ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
+	if ( li->li_conn_expire_task == NULL ) {
+		li->li_conn_expire_task = ldap_pvt_runqueue_insert( &slapd_rq,
+			ldap_back_conn_expire_time( li, lc ) - slap_get_time(),
+			ldap_back_conn_expire_fn, li, "ldap_back_conn_expire_fn",
+			"ldap_back_conn_expire_timer" );
+		slap_wake_listener();
+		Debug( LDAP_DEBUG_TRACE,
+			"ldap_back_conn_prune: scheduled connection expiry timer to %ld sec\n",
+			li->li_conn_expire_task->interval.tv_sec );
+	}
+	ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
+
+	return;
+}
\ No newline at end of file