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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 1999-2005 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_ldap.h>
#define PRINT_CONNTREE 0
static LDAP_REBIND_PROC ldap_back_default_rebind;
LDAP_REBIND_PROC *ldap_back_rebind_f = ldap_back_default_rebind;
static int
ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs );
static int
ldap_back_prepare_conn( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok );
int
ldap_back_bind( Operation *op, SlapReply *rs )
{
struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
struct ldapconn *lc;
int rc = 0;
ber_int_t msgid;
lc = ldap_back_getconn( op, rs, LDAP_BACK_SENDERR );
if ( !lc ) {
return rs->sr_err;
}
if ( !BER_BVISNULL( &lc->lc_bound_ndn ) ) {
ch_free( lc->lc_bound_ndn.bv_val );
BER_BVZERO( &lc->lc_bound_ndn );
}
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
/* 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, op->o_ctrls, NULL, &msgid );
rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
if ( rc == LDAP_SUCCESS ) {
/* If defined, proxyAuthz will be used also when
* back-ldap is the authorizing backend; for this
* purpose, a successful bind is followed by a
* bind with the configured identity assertion */
/* NOTE: use with care */
if ( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) {
ldap_back_proxy_authz_bind( lc, op, rs );
if ( !LDAP_BACK_CONN_ISBOUND( lc ) ) {
rc = 1;
goto done;
}
}
LDAP_BACK_CONN_ISBOUND_SET( lc );
ber_dupbv( &lc->lc_bound_ndn, &op->o_req_ndn );
if ( LDAP_BACK_SAVECRED( li ) ) {
if ( !BER_BVISNULL( &lc->lc_cred ) ) {
memset( lc->lc_cred.bv_val, 0,
lc->lc_cred.bv_len );
}
ber_bvreplace( &lc->lc_cred, &op->orb_cred );
ldap_set_rebind_proc( lc->lc_ld, ldap_back_rebind_f, lc );
}
}
done:;
/* 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 ) )
{
int lerr;
/* wait for all other ops to release the connection */
retry_lock:;
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
if ( lc->lc_refcnt > 1 ) {
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
ldap_pvt_thread_yield();
goto retry_lock;
}
assert( lc->lc_refcnt == 1 );
lc = avl_delete( &li->conntree, (caddr_t)lc,
ldap_back_conn_cmp );
assert( lc != NULL );
ber_bvreplace( &lc->lc_local_ndn, &op->o_req_ndn );
lerr = avl_insert( &li->conntree, (caddr_t)lc,
ldap_back_conn_cmp, ldap_back_conn_dup );
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
if ( lerr == -1 ) {
/* we can do this because lc_refcnt == 1 */
ldap_back_conn_free( lc );
lc = NULL;
}
}
if ( lc != NULL ) {
ldap_back_release_conn( op, rs, lc );
}
return( rc );
}
/*
* ldap_back_conn_cmp
*
* compares two struct ldapconn based on the value of the conn pointer;
* used by avl stuff
*/
int
ldap_back_conn_cmp( const void *c1, const void *c2 )
{
const struct ldapconn *lc1 = (const struct ldapconn *)c1;
const struct ldapconn *lc2 = (const struct ldapconn *)c2;
int rc;
/* If local DNs don't match, it is definitely not a match */
rc = ber_bvcmp( &lc1->lc_local_ndn, &lc2->lc_local_ndn );
if ( rc ) {
return rc;
}
/* 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_conn_dup
*
* returns -1 in case a duplicate struct ldapconn has been inserted;
* used by avl stuff
*/
int
ldap_back_conn_dup( void *c1, void *c2 )
{
struct ldapconn *lc1 = (struct ldapconn *)c1;
struct ldapconn *lc2 = (struct ldapconn *)c2;
/* Cannot have more than one shared session with same DN */
if ( dn_match( &lc1->lc_local_ndn, &lc2->lc_local_ndn ) &&
lc1->lc_conn == lc2->lc_conn )
{
return -1;
}
return 0;
}
#if PRINT_CONNTREE > 0
static void
ravl_print( Avlnode *root, int depth )
{
int i;
struct ldapconn *lc;
if ( root == 0 ) {
return;
}
ravl_print( root->avl_right, depth+1 );
for ( i = 0; i < depth; i++ ) {
printf( " " );
}
lc = root->avl_data;
printf( "lc(%lx) local(%s) conn(%lx) %d\n",
lc, lc->lc_local_ndn.bv_val, lc->lc_conn, root->avl_bf );
ravl_print( root->avl_left, depth+1 );
}
static void
myprint( Avlnode *root )
{
printf( "********\n" );
if ( root == 0 ) {
printf( "\tNULL\n" );
} else {
ravl_print( root, 0 );
}
printf( "********\n" );
}
#endif /* PRINT_CONNTREE */
int
ldap_back_freeconn( Operation *op, struct ldapconn *lc )
{
struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
assert( lc->lc_refcnt > 0 );
if ( --lc->lc_refcnt == 0 ) {
lc = avl_delete( &li->conntree, (caddr_t)lc,
ldap_back_conn_cmp );
assert( lc != NULL );
ldap_back_conn_free( (void *)lc );
}
ldap_pvt_thread_mutex_unlock( &li->conn_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;
struct ldapinfo dummy;
/* this is ridiculous... */
dummy.flags = flags;
/* start TLS ("tls-[try-]{start,propagate}" statements) */
if ( ( LDAP_BACK_USE_TLS( &dummy ) || ( *is_tls && LDAP_BACK_PROPAGATE_TLS( &dummy ) ) )
&& !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 ) {
protocol = LDAP_VERSION3;
/* Set LDAP version */
ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
(const void *)&protocol );
}
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_OTHER;
} 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_OTHER;
} else if ( rc == LDAP_RES_EXTENDED ) {
struct berval *data = NULL;
rc = ldap_parse_extended_result( ld, res,
NULL, &data, 0 );
if ( rc == LDAP_SUCCESS ) {
rc = ldap_result2error( ld, res, 1 );
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_OTHER;
*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( &dummy ) ) {
*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( struct ldapconn **lcp, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
int vers = op->o_protocol;
LDAP *ld = NULL;
#ifdef HAVE_TLS
int is_tls = op->o_conn->c_is_tls;
#endif /* HAVE_TLS */
assert( lcp != NULL );
rs->sr_err = ldap_initialize( &ld, li->url );
if ( rs->sr_err != LDAP_SUCCESS ) {
goto error_return;
}
/* Set LDAP version. This will always succeed: If the client
* bound with a particular version, then so can we.
*/
ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, (const void *)&vers );
/* automatically chase referrals ("[dont-]chase-referrals" statement) */
if ( LDAP_BACK_CHASE_REFERRALS( li ) ) {
ldap_set_option( ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
}
#ifdef HAVE_TLS
rs->sr_err = ldap_back_start_tls( ld, op->o_protocol, &is_tls,
li->url, li->flags, li->nretries, &rs->sr_text );
if ( rs->sr_err != LDAP_SUCCESS ) {
ldap_unbind_ext( ld, NULL, NULL );
goto error_return;
}
#endif /* HAVE_TLS */
if ( *lcp == NULL ) {
*lcp = (struct ldapconn *)ch_calloc( 1, sizeof( struct ldapconn ) );
(*lcp)->lc_flags= li->flags;
}
(*lcp)->lc_ld = ld;
(*lcp)->lc_refcnt = 1;
#ifdef HAVE_TLS
if ( is_tls ) {
LDAP_BACK_CONN_ISTLS_SET( *lcp );
} else {
LDAP_BACK_CONN_ISTLS_CLEAR( *lcp );
}
#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 = "ldap_initialize() failed";
}
send_ldap_result( op, rs );
rs->sr_text = NULL;
}
}
return rs->sr_err;
}
struct ldapconn *
ldap_back_getconn( Operation *op, SlapReply *rs, ldap_back_send_t sendok )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
struct ldapconn *lc,
lc_curr = { 0 };
int refcnt = 1;
/* 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;
lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
} else {
lc_curr.lc_local_ndn = op->o_ndn;
/* Explicit binds must not be shared */
if ( op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) {
lc_curr.lc_conn = op->o_conn;
} else {
lc_curr.lc_conn = LDAP_BACK_PCONN_SET( op );
}
}
/* Searches for a ldapconn in the avl tree */
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
lc = (struct ldapconn *)avl_find( li->conntree,
(caddr_t)&lc_curr, ldap_back_conn_cmp );
if ( lc != NULL ) {
refcnt = ++lc->lc_refcnt;
}
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
/* Looks like we didn't get a bind. Open a new session... */
if ( lc == NULL ) {
if ( ldap_back_prepare_conn( &lc, op, rs, sendok ) != LDAP_SUCCESS ) {
return NULL;
}
lc->lc_conn = lc_curr.lc_conn;
ber_dupbv( &lc->lc_local_ndn, &lc_curr.lc_local_ndn );
if ( LDAP_BACK_CONN_ISPRIV( &lc_curr ) ) {
ber_dupbv( &lc->lc_cred, &li->acl_passwd );
ber_dupbv( &lc->lc_bound_ndn, &li->acl_authcDN );
LDAP_BACK_CONN_ISPRIV_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 ( lc->lc_conn == LDAP_BACK_PCONN_TLS
&& !ldap_tls_inplace( lc->lc_ld ) )
{
struct ldapconn *tmplc;
lc_curr.lc_conn = LDAP_BACK_PCONN;
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
tmplc = (struct ldapconn *)avl_find( li->conntree,
(caddr_t)&lc_curr, ldap_back_conn_cmp );
if ( tmplc != NULL ) {
refcnt = ++tmplc->lc_refcnt;
ldap_back_conn_free( lc );
lc = tmplc;
}
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
if ( tmplc != NULL ) {
goto done;
}
}
#endif /* HAVE_TLS */
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
/* Inserts the newly created ldapconn in the avl tree */
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
assert( lc->lc_refcnt == 1 );
rs->sr_err = avl_insert( &li->conntree, (caddr_t)lc,
ldap_back_conn_cmp, ldap_back_conn_dup );
#if PRINT_CONNTREE > 0
myprint( li->conntree );
#endif /* PRINT_CONNTREE */
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
Debug( LDAP_DEBUG_TRACE,
"=>ldap_back_getconn: conn %p inserted (refcnt=%u)\n",
(void *)lc, refcnt, 0 );
/* Err could be -1 in case a duplicate ldapconn is inserted */
if ( rs->sr_err != 0 ) {
ldap_back_conn_free( lc );
rs->sr_err = LDAP_OTHER;
if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) {
send_ldap_error( op, rs, LDAP_OTHER,
"internal server error" );
}
return NULL;
}
} else {
Debug( LDAP_DEBUG_TRACE,
"=>ldap_back_getconn: conn %p fetched (refcnt=%u)\n",
(void *)lc, refcnt, 0 );
}
done:;
return lc;
}
void
ldap_back_release_conn(
Operation *op,
SlapReply *rs,
struct ldapconn *lc )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
assert( lc->lc_refcnt > 0 );
lc->lc_refcnt--;
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
}
/*
* ldap_back_dobind
*
* Note: as the check for the value of lc->lc_bound was already here, I removed
* it from all the callers, and I made the function return the flag, so
* it can be used to simplify the check.
*
* Note: dolock indicates whether li->conn_mutex must be locked or not
*/
static int
ldap_back_dobind_int(
struct ldapconn *lc,
Operation *op,
SlapReply *rs,
ldap_back_send_t sendok,
int retries,
int dolock )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
int rc = LDAP_BACK_CONN_ISBOUND( lc );
ber_int_t msgid;
assert( retries >= 0 );
if ( rc ) {
return rc;
}
/*
* 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 authrizing backend,
* but the "override" flag is given to idassert.
* It allows to use SASL bind and yet proxyAuthz users
*/
if ( op->o_conn != NULL &&
!op->o_do_not_cache &&
( BER_BVISNULL( &lc->lc_bound_ndn ) ||
( li->idassert_flags & LDAP_BACK_AUTH_OVERRIDE ) ) )
{
(void)ldap_back_proxy_authz_bind( lc, op, rs );
goto done;
}
#ifdef HAVE_CYRUS_SASL
if ( LDAP_BACK_CONN_ISPRIV( lc )
&& li->acl_authmethod == LDAP_AUTH_SASL )
{
void *defaults = NULL;
if ( li->acl_secprops != NULL ) {
rc = ldap_set_option( lc->lc_ld,
LDAP_OPT_X_SASL_SECPROPS, li->acl_secprops);
if ( rc != LDAP_OPT_SUCCESS ) {
Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
"(%s,SECPROPS,\"%s\") failed!\n",
li->url, li->acl_secprops, 0 );
goto done;
}
}
defaults = lutil_sasl_defaults( lc->lc_ld,
li->acl_sasl_mech.bv_val,
li->acl_sasl_realm.bv_val,
li->acl_authcID.bv_val,
li->acl_passwd.bv_val,
NULL );
rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld,
li->acl_authcDN.bv_val,
li->acl_sasl_mech.bv_val, NULL, NULL,
LDAP_SASL_QUIET, lutil_sasl_interact,
defaults );
lutil_sasl_freedefs( defaults );
rs->sr_err = slap_map_api2result( rs );
if ( rs->sr_err != LDAP_SUCCESS ) {
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
send_ldap_result( op, rs );
} else {
LDAP_BACK_CONN_ISBOUND_SET( lc );
}
goto done;
}
#endif /* HAVE_CYRUS_SASL */
retry:;
rs->sr_err = ldap_sasl_bind( lc->lc_ld,
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->conn_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 ( dolock ) {
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
}
if ( rs->sr_err == LDAP_SUCCESS ) {
if ( retries > 0 ) {
retries--;
}
goto retry;
}
}
ldap_back_freeconn( op, lc );
rs->sr_err = slap_map_api2result( rs );
return 0;
}
rc = ldap_back_op_result( lc, op, rs, msgid, sendok );
if ( rc == LDAP_SUCCESS ) {
LDAP_BACK_CONN_ISBOUND_SET( lc );
} else {
ldap_back_release_conn( op, rs, lc );
}
done:;
rc = LDAP_BACK_CONN_ISBOUND( lc );
return rc;
}
int
ldap_back_dobind( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
return ldap_back_dobind_int( lc, op, rs, sendok, 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.
*/
static int
ldap_back_default_rebind( LDAP *ld, LDAP_CONST char *url, ber_tag_t request,
ber_int_t msgid, void *params )
{
struct ldapconn *lc = (struct ldapconn *)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, lc->lc_bound_ndn.bv_val,
LDAP_SASL_SIMPLE, &lc->lc_cred, NULL, NULL, NULL );
}
int
ldap_back_op_result(
struct ldapconn *lc,
Operation *op,
SlapReply *rs,
ber_int_t msgid,
ldap_back_send_t sendok )
{
char *match = NULL;
LDAPMessage *res = NULL;
char *text = NULL;
#define ERR_OK(err) ((err) == LDAP_SUCCESS || (err) == LDAP_COMPARE_FALSE || (err) == LDAP_COMPARE_TRUE)
rs->sr_text = NULL;
rs->sr_matched = 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;
LDAP_BACK_TV_SET( &tv );
retry:;
/* if result parsing fails, note the failure reason */
switch ( ldap_result( lc->lc_ld, msgid, 1, &tv, &res ) ) {
case 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:
rc = ldap_parse_result( lc->lc_ld, res, &rs->sr_err,
&match, &text, NULL, NULL, 1 );
rs->sr_text = text;
if ( rc != LDAP_SUCCESS ) {
rs->sr_err = rc;
}
}
}
/* 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 ( op->o_conn &&
( ( sendok & LDAP_BACK_SENDOK )
|| ( ( 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;
return( ERR_OK( rs->sr_err ) ? LDAP_SUCCESS : rs->sr_err );
}
/* return true if bound, false if failed */
int
ldap_back_retry( struct ldapconn *lc, Operation *op, SlapReply *rs, ldap_back_send_t sendok )
{
int rc = 0;
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
ldap_pvt_thread_mutex_lock( &li->conn_mutex );
if ( lc->lc_refcnt == 1 ) {
ldap_unbind_ext( lc->lc_ld, NULL, NULL );
lc->lc_ld = NULL;
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
/* lc here must be the regular lc, reset and ready for init */
rc = ldap_back_prepare_conn( &lc, op, rs, sendok );
if ( rc == LDAP_SUCCESS ) {
rc = ldap_back_dobind_int( lc, op, rs, sendok, 0, 0 );
}
}
ldap_pvt_thread_mutex_unlock( &li->conn_mutex );
return rc;
}
static int
ldap_back_proxy_authz_bind( struct ldapconn *lc, Operation *op, SlapReply *rs )
{
struct ldapinfo *li = (struct ldapinfo *)op->o_bd->be_private;
struct berval binddn = slap_empty_bv;
struct berval bindcred = slap_empty_bv;
int dobind = 0;
int msgid;
int rc;
/*
* 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 "proxyauthzdn" is set, then bind as
* "proxyauthzdn" and explicitly add the proxyAuthz
* control to every operation with the dn bound
* to the connection as control value.
*/
/* bind as proxyauthzdn only if no idassert mode
* is requested, or if the client's identity
* is authorized */
switch ( li->idassert_mode ) {
case LDAP_BACK_IDASSERT_LEGACY:
if ( !BER_BVISNULL( &op->o_conn->c_ndn ) && !BER_BVISEMPTY( &op->o_conn->c_ndn ) ) {
if ( !BER_BVISNULL( &li->idassert_authcDN ) && !BER_BVISEMPTY( &li->idassert_authcDN ) )
{
binddn = li->idassert_authcDN;
bindcred = li->idassert_passwd;
dobind = 1;
}
}
break;
default:
/* NOTE: rootdn can always idassert */
if ( li->idassert_authz && !be_isroot( op ) ) {
struct berval authcDN;
if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
authcDN = slap_empty_bv;
} else {
authcDN = op->o_conn->c_ndn;
}
rs->sr_err = slap_sasl_matches( op, li->idassert_authz,
&authcDN, &authcDN );
if ( rs->sr_err != LDAP_SUCCESS ) {
if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE ) {
send_ldap_result( op, rs );
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
} else {
rs->sr_err = LDAP_SUCCESS;
binddn = slap_empty_bv;
bindcred = slap_empty_bv;
break;
}
goto done;
}
}
binddn = li->idassert_authcDN;
bindcred = li->idassert_passwd;
dobind = 1;
break;
}
if ( dobind && 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->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ ) )
{
switch ( li->idassert_mode ) {
case LDAP_BACK_IDASSERT_OTHERID:
case LDAP_BACK_IDASSERT_OTHERDN:
authzID = li->idassert_authzID;
break;
case LDAP_BACK_IDASSERT_ANONYMOUS:
BER_BVSTR( &authzID, "dn:" );
break;
case LDAP_BACK_IDASSERT_SELF:
if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
/* connection is not authc'd, so don't idassert */
BER_BVSTR( &authzID, "dn:" );
break;
}
authzID.bv_len = STRLENOF( "dn:" ) + op->o_conn->c_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:" ),
op->o_conn->c_ndn.bv_val, op->o_conn->c_ndn.bv_len + 1 );
freeauthz = 1;
break;
default:
break;
}
}
if ( li->idassert_secprops != NULL ) {
rs->sr_err = ldap_set_option( lc->lc_ld,
LDAP_OPT_X_SASL_SECPROPS,
(void *)li->idassert_secprops );
if ( rs->sr_err != LDAP_OPT_SUCCESS ) {
send_ldap_result( op, rs );
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
goto done;
}
}
defaults = lutil_sasl_defaults( lc->lc_ld,
li->idassert_sasl_mech.bv_val,
li->idassert_sasl_realm.bv_val,
li->idassert_authcID.bv_val,
li->idassert_passwd.bv_val,
authzID.bv_val );
rs->sr_err = ldap_sasl_interactive_bind_s( lc->lc_ld, binddn.bv_val,
li->idassert_sasl_mech.bv_val, NULL, NULL,
LDAP_SASL_QUIET, lutil_sasl_interact,
defaults );
rs->sr_err = slap_map_api2result( rs );
if ( rs->sr_err != LDAP_SUCCESS ) {
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
send_ldap_result( op, rs );
} else {
LDAP_BACK_CONN_ISBOUND_SET( lc );
}
lutil_sasl_freedefs( defaults );
if ( freeauthz ) {
slap_sl_free( authzID.bv_val, op->o_tmpmemctx );
}
goto done;
#endif /* HAVE_CYRUS_SASL */
}
switch ( li->idassert_authmethod ) {
case LDAP_AUTH_NONE:
LDAP_BACK_CONN_ISBOUND_SET( lc );
goto done;
case LDAP_AUTH_SIMPLE:
rs->sr_err = ldap_sasl_bind( lc->lc_ld,
binddn.bv_val, LDAP_SASL_SIMPLE,
&bindcred, NULL, NULL, &msgid );
break;
default:
/* unsupported! */
LDAP_BACK_CONN_ISBOUND_CLEAR( lc );
rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
send_ldap_result( op, rs );
goto done;
}
rc = ldap_back_op_result( lc, op, rs, msgid, LDAP_BACK_SENDERR );
if ( rc == LDAP_SUCCESS ) {
LDAP_BACK_CONN_ISBOUND_SET( lc );
}
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(
struct ldapconn *lc,
Operation *op,
SlapReply *rs,
LDAPControl ***pctrls )
{
struct ldapinfo *li = (struct ldapinfo *) op->o_bd->be_private;
LDAPControl **ctrls = NULL;
int i = 0,
mode;
struct berval assertedID;
*pctrls = NULL;
rs->sr_err = LDAP_SUCCESS;
/* 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( &li->idassert_authcID ) || BER_BVISEMPTY( &li->idassert_authcID ) )
&& ( BER_BVISNULL( &li->idassert_authcDN ) || BER_BVISEMPTY( &li->idassert_authcDN ) ) )
{
goto done;
}
if ( !op->o_conn || op->o_do_not_cache || be_isroot( op ) ) {
goto done;
}
if ( li->idassert_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( &lc->lc_bound_ndn ) ) {
goto done;
}
if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
goto done;
}
if ( BER_BVISNULL( &li->idassert_authcDN ) ) {
goto done;
}
} else if ( li->idassert_authmethod == LDAP_AUTH_SASL ) {
if ( ( li->idassert_flags & LDAP_BACK_AUTH_NATIVE_AUTHZ )
/* && ( !BER_BVISNULL( &op->o_conn->c_ndn )
|| LDAP_BACK_CONN_ISBOUND( lc ) ) */ )
{
/* already asserted in SASL via native authz */
/* NOTE: the test on lc->lc_bound is used to trap
* native authorization of anonymous users,
* since in that case op->o_conn->c_ndn is NULL */
goto done;
}
} else if ( li->idassert_authz && !be_isroot( op ) ) {
int rc;
struct berval authcDN;
if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
authcDN = slap_empty_bv;
} else {
authcDN = op->o_conn->c_ndn;
}
rc = slap_sasl_matches( op, li->idassert_authz,
&authcDN, & authcDN );
if ( rc != LDAP_SUCCESS ) {
if ( li->idassert_flags & LDAP_BACK_AUTH_PRESCRIPTIVE )
{
/* op->o_conn->c_ndn is not authorized
* to use idassert */
return rc;
}
return rs->sr_err;
}
}
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_do_not_cache && op->o_is_auth_check ) {
mode = LDAP_BACK_IDASSERT_NOASSERT;
} else {
mode = li->idassert_mode;
}
switch ( mode ) {
case LDAP_BACK_IDASSERT_LEGACY:
case LDAP_BACK_IDASSERT_SELF:
/* original behavior:
* assert the client's identity */
if ( BER_BVISNULL( &op->o_conn->c_ndn ) ) {
assertedID = slap_empty_bv;
} else {
assertedID = op->o_conn->c_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 = li->idassert_authzID;
break;
default:
assert( 0 );
}
if ( BER_BVISNULL( &assertedID ) ) {
assertedID = slap_empty_bv;
}
if ( op->o_ctrls ) {
for ( i = 0; op->o_ctrls[ i ]; i++ )
/* just count ctrls */ ;
}
ctrls = ch_malloc( sizeof( LDAPControl * ) * (i + 2) );
ctrls[ 0 ] = ch_malloc( sizeof( LDAPControl ) );
ctrls[ 0 ]->ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
ctrls[ 0 ]->ldctl_iscritical = 1;
switch ( li->idassert_mode ) {
/* already in u:ID or dn:DN form */
case LDAP_BACK_IDASSERT_OTHERID:
case LDAP_BACK_IDASSERT_OTHERDN:
ber_dupbv( &ctrls[ 0 ]->ldctl_value, &assertedID );
break;
/* needs the dn: prefix */
default:
ctrls[ 0 ]->ldctl_value.bv_len = assertedID.bv_len + STRLENOF( "dn:" );
ctrls[ 0 ]->ldctl_value.bv_val = ch_malloc( ctrls[ 0 ]->ldctl_value.bv_len + 1 );
AC_MEMCPY( ctrls[ 0 ]->ldctl_value.bv_val, "dn:", STRLENOF( "dn:" ) );
AC_MEMCPY( &ctrls[ 0 ]->ldctl_value.bv_val[ STRLENOF( "dn:" ) ],
assertedID.bv_val, assertedID.bv_len + 1 );
break;
}
if ( op->o_ctrls ) {
for ( i = 0; op->o_ctrls[ i ]; i++ ) {
ctrls[ i + 1 ] = op->o_ctrls[ i ];
}
}
ctrls[ i + 1 ] = NULL;
done:;
if ( ctrls == NULL ) {
ctrls = op->o_ctrls;
}
*pctrls = ctrls;
return rs->sr_err;
}
int
ldap_back_proxy_authz_ctrl_free( Operation *op, LDAPControl ***pctrls )
{
LDAPControl **ctrls = *pctrls;
/* we assume that the first control is the proxyAuthz
* added by back-ldap, so it's the only one we explicitly
* free */
if ( ctrls && ctrls != op->o_ctrls ) {
assert( ctrls[ 0 ] != NULL );
if ( !BER_BVISNULL( &ctrls[ 0 ]->ldctl_value ) ) {
free( ctrls[ 0 ]->ldctl_value.bv_val );
}
free( ctrls[ 0 ] );
free( ctrls );
}
*pctrls = NULL;
return 0;
}
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