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openldap/servers/slapd/back-ldap/bind.c

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/* bind.c - ldap backend bind function */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1999-2008 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"
#undef ldap_debug /* silence a warning in ldap-int.h */
#include "../../../libraries/libldap/ldap-int.h"
#include "lutil_ldap.h"
#define LDAP_CONTROL_OBSOLETE_PROXY_AUTHZ "2.16.840.1.113730.3.4.12"
#if LDAP_BACK_PRINT_CONNTREE > 0
static void
ldap_back_ravl_print( Avlnode *root, int depth )
{
int i;
ldapconn_t *lc;
if ( root == 0 ) {
return;
}
ldap_back_ravl_print( root->avl_right, depth+1 );
for ( i = 0; i < depth; i++ ) {
fprintf( stderr, "-" );
}
lc = root->avl_data;
fprintf( stderr, "lc=%p local=\"%s\" conn=%p %s refcnt=%d flags=0x%08x\n",
(void *)lc,
lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
(void *)lc->lc_conn,
avl_bf2str( root->avl_bf ), lc->lc_refcnt, lc->lc_lcflags );
ldap_back_ravl_print( root->avl_left, depth+1 );
}
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] lc=%p local=\"%s\" conn=%p refcnt=%d flags=0x%08x\n",
i,
(void *)lc,
lc->lc_local_ndn.bv_val ? lc->lc_local_ndn.bv_val : "",
(void *)lc->lc_conn, lc->lc_refcnt, lc->lc_lcflags );
i++;
}
}
if ( li->li_conninfo.lai_tree == 0 ) {
fprintf( stderr, "\t(empty)\n" );
} else {
ldap_back_ravl_print( li->li_conninfo.lai_tree, 0 );
}
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 );
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 = avl_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;
}
}
ldap_back_controls_free( op, rs, &ctrls );
if ( rc == LDAP_SUCCESS ) {
/* 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 = avl_delete( &li->li_conninfo.lai_tree, (caddr_t)lc, ldap_back_conn_cmp ) ) != NULL )
{
Debug( LDAP_DEBUG_TRACE,
"=>ldap_back_bind: destroying conn %ld (refcnt=%u)\n",
LDAP_BACK_PCONN_ID( lc ), lc->lc_refcnt, 0 );
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 = avl_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 retries,
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;
LDAP_BACK_TV_SET( &tv );
retry:;
rc = ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res );
if ( rc < 0 ) {
rc = LDAP_UNAVAILABLE;
} else if ( rc == 0 ) {
if ( retries != LDAP_BACK_RETRY_NEVER ) {
ldap_pvt_thread_yield();
if ( retries > 0 ) {
retries--;
}
LDAP_BACK_TV_SET( &tv );
goto retry;
}
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 ) {
int err;
rc = ldap_parse_result( ld, res, &err,
NULL, NULL, NULL, NULL, 1 );
if ( rc == LDAP_SUCCESS ) {
rc = err;
}
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;
time_t lc_time = (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 );
}
#ifdef HAVE_TLS
if ( LDAP_BACK_CONN_ISPRIV( lc ) ) {
sb = &li->li_acl;
} else if ( LDAP_BACK_CONN_ISIDASSERT( lc ) ) {
sb = &li->li_idassert.si_bc;
} else {
sb = &li->li_tls;
}
if ( sb->sb_tls_do_init ) {
bindconf_tls_set( sb, ld );
} else if ( sb->sb_tls_ctx ) {
ldap_set_option( ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx );
}
ldap_pvt_thread_mutex_lock( &li->li_uri_mutex );
rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
li->li_uri, li->li_flags, li->li_nretries, &rs->sr_text );
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... */
lc_time = 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 ( lc_time != (time_t)(-1) ) {
lc->lc_time = lc_time;
}
#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,
ldapconn_t, lc_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 *)avl_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;
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 acl_authcDN is to be used; however, in some cases
* one already configured identity assertion with a highly
* privileged idassert_authcDN, so if acl_authcDN is NULL
* and idassert_authcDN is not, use the second 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 ( BER_BVISNULL( &li->li_acl_authcDN ) && !BER_BVISNULL( &li->li_idassert_authcDN ) ) {
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 );
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 = avl_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 );
if ( LogTest( LDAP_DEBUG_TRACE ) ) {
char buf[ SLAP_TEXT_BUFLEN ];
snprintf( buf, sizeof( buf ),
"lc=%p inserted refcnt=%u rc=%d",
(void *)lc, refcnt, rs->sr_err );
Debug( LDAP_DEBUG_TRACE,
"=>ldap_back_getconn: %s: %s\n",
op->o_log_prefix, buf, 0 );
}
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;
}
}
} 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 );
}
if ( LogTest( LDAP_DEBUG_TRACE ) ) {
char buf[ SLAP_TEXT_BUFLEN ];
snprintf( buf, sizeof( buf ),
"conn %p fetched refcnt=%u%s",
(void *)lc, refcnt,
expiring ? " expiring" : "" );
Debug( LDAP_DEBUG_TRACE,
"=>ldap_back_getconn: %s.\n", buf, 0, 0 );
}
}
#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, 0, 0 );
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:
break;
}
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};
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 );
assert( rc == 1 );
}
rc = ldap_back_proxy_authz_bind( lc, op, rs, sendok, &binddn, &bindcred );
goto done;
}
#ifdef HAVE_CYRUS_SASL
if ( LDAP_BACK_CONN_ISPRIV( lc )
&& li->li_acl_authmethod == LDAP_AUTH_SASL )
{
void *defaults = NULL;
if ( li->li_acl_secprops != NULL ) {
rc = ldap_set_option( lc->lc_ld,
LDAP_OPT_X_SASL_SECPROPS, li->li_acl_secprops );
if ( rc != LDAP_OPT_SUCCESS ) {
Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
"(SECPROPS,\"%s\") failed!\n",
li->li_acl_secprops, 0, 0 );
goto done;
}
}
defaults = lutil_sasl_defaults( lc->lc_ld,
li->li_acl_sasl_mech.bv_val,
li->li_acl_sasl_realm.bv_val,
li->li_acl_authcID.bv_val,
li->li_acl_passwd.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,
li->li_acl_authcDN.bv_val,
li->li_acl_sasl_mech.bv_val, NULL, NULL,
LDAP_SASL_QUIET, lutil_sasl_interact,
defaults );
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:;
rs->sr_err = ldap_sasl_bind( lc->lc_ld,
BER_BVISNULL( &lc->lc_cred ) ? "" : lc->lc_bound_ndn.bv_val,
LDAP_SASL_SIMPLE, &lc->lc_cred,
NULL, NULL, &msgid );
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 );
}
rc = 0;
goto 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 );
}
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,
LDAP_BACK_RETRY_DEFAULT, &text );
if ( rc != LDAP_SUCCESS ) {
return rc;
}
}
#endif /* HAVE_TLS */
/* FIXME: add checks on the URL/identity? */
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;
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 );
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;
#define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
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 ( 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->lc_time = op->o_time;
}
rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
&match, &text, &refs, &ctrls, 1 );
rs->sr_text = text;
if ( rc != LDAP_SUCCESS ) {
rs->sr_err = rc;
}
/* 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, 0 );
} 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, 0 );
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 ( !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 ) && ERR_OK( rs->sr_err ) )
|| ( ( sendok & LDAP_BACK_SENDERR ) && rs->sr_err != LDAP_SUCCESS ) ) )
{
send_ldap_result( op, rs );
}
if ( match ) {
if ( rs->sr_matched != match ) {
free( (char *)rs->sr_matched );
}
rs->sr_matched = NULL;
ldap_memfree( match );
}
if ( text ) {
ldap_memfree( text );
}
rs->sr_text = NULL;
if ( rs->sr_ref ) {
op->o_tmpfree( rs->sr_ref, op->o_tmpmemctx );
rs->sr_ref = NULL;
}
if ( refs ) {
ber_memvfree( (void **)refs );
}
if ( ctrls ) {
assert( rs->sr_ctrls != NULL );
ldap_controls_free( ctrls );
rs->sr_ctrls = NULL;
}
return( 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;
LDAP_BACK_CONN_TAINTED_SET( *lcp );
(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, 0 );
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;
}
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 ( li->li_idassert_authz && !be_isroot( op ) ) {
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;
/* 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;
}
rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn->bv_val,
li->li_idassert_sasl_mech.bv_val, NULL, NULL,
LDAP_SASL_QUIET, lutil_sasl_interact,
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;
}
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 ) );
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 );
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 ) ) {
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 if ( !BER_BVISNULL( &op->o_conn->c_ndn ) ) {
ndn = op->o_conn->c_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 reques.
*
* 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;
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;
*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 + j1 <= sizeof( c )/sizeof(LDAPControl) );
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 ) {
for ( i = 0; op->o_ctrls[ i ]; i++ ) {
ctrls[ i + j1 ] = op->o_ctrls[ i ];
}
}
n += j1;
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;
}
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