mirror of
https://git.openldap.org/openldap/openldap.git
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338 lines
7.8 KiB
C
338 lines
7.8 KiB
C
/* bind.c - decode an ldap bind operation and pass it to a backend db */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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/*
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* Copyright (c) 1995 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include "ldap_pvt.h"
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#include "slap.h"
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int
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do_bind(
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Connection *conn,
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Operation *op
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)
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{
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BerElement *ber = op->o_ber;
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ber_int_t version;
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ber_tag_t method;
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char *mech;
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char *dn;
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char *ndn;
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ber_tag_t tag;
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int rc = LDAP_SUCCESS;
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struct berval cred;
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Backend *be;
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Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
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dn = NULL;
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ndn = NULL;
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mech = NULL;
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cred.bv_val = NULL;
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ldap_pvt_thread_mutex_lock( &conn->c_mutex );
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/* Force to connection to "anonymous" until bind succeeds.
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* This may need to be relocated or done on a case by case basis
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* to handle certain SASL mechanisms.
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*/
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if ( conn->c_cdn != NULL ) {
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free( conn->c_cdn );
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conn->c_cdn = NULL;
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}
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if ( conn->c_dn != NULL ) {
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free( conn->c_dn );
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conn->c_dn = NULL;
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}
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ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
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if ( op->o_dn != NULL ) {
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free( op->o_dn );
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op->o_dn = ch_strdup( "" );
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}
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if ( op->o_ndn != NULL ) {
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free( op->o_ndn );
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op->o_ndn = ch_strdup( "" );
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}
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/*
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* Parse the bind request. It looks like this:
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*
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* BindRequest ::= SEQUENCE {
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* version INTEGER, -- version
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* name DistinguishedName, -- dn
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* authentication CHOICE {
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* simple [0] OCTET STRING -- passwd
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* krbv42ldap [1] OCTET STRING
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* krbv42dsa [2] OCTET STRING
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* SASL [3] SaslCredentials
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* }
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* }
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*
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* SaslCredentials ::= SEQUENCE {
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* mechanism LDAPString,
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* credentials OCTET STRING OPTIONAL
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* }
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*/
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tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
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if ( tag == LBER_ERROR ) {
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Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
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send_ldap_disconnect( conn, op,
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LDAP_PROTOCOL_ERROR, "decoding error" );
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rc = -1;
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goto cleanup;
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}
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ndn = ch_strdup( dn );
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if ( dn_normalize( ndn ) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
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send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
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"invalid DN", NULL, NULL );
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goto cleanup;
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}
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op->o_protocol = version;
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if( method != LDAP_AUTH_SASL ) {
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tag = ber_scanf( ber, /*{*/ "o}", &cred );
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} else {
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tag = ber_scanf( ber, "{a" /*}*/, &mech );
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if ( tag != LBER_ERROR ) {
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ber_len_t len;
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tag = ber_peek_tag( ber, &len );
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if ( tag == LDAP_TAG_LDAPCRED ) {
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tag = ber_scanf( ber, "o", &cred );
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}
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if ( tag != LBER_ERROR ) {
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tag = ber_scanf( ber, /*{{*/ "}}" );
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}
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}
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}
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if ( tag == LBER_ERROR ) {
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send_ldap_disconnect( conn, op,
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LDAP_PROTOCOL_ERROR,
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"decoding error" );
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rc = -1;
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goto cleanup;
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}
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if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
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Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
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goto cleanup;
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}
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if( method == LDAP_AUTH_SASL ) {
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Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
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dn, mech, NULL );
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} else {
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Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
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(unsigned long) version, dn, (unsigned long) method );
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}
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Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
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op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
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if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
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Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
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(unsigned long) version, 0, 0 );
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send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
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NULL, "version not supported", NULL, NULL );
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goto cleanup;
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}
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if ( method == LDAP_AUTH_SASL ) {
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if ( version < LDAP_VERSION3 ) {
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Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
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(unsigned long) version, 0, 0 );
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send_ldap_disconnect( conn, op,
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LDAP_PROTOCOL_ERROR, "sasl bind requires LDAPv3" );
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rc = -1;
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goto cleanup;
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}
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if( mech == NULL || *mech == '\0' ) {
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Debug( LDAP_DEBUG_ANY,
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"do_bind: no sasl mechanism provided\n",
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0, 0, 0 );
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send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
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NULL, "no sasl mechanism provided", NULL, NULL );
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goto cleanup;
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}
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if( !charray_inlist( supportedSASLMechanisms, mech ) ) {
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Debug( LDAP_DEBUG_ANY,
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"do_bind: sasl mechanism=\"%s\" not supported.\n",
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mech, 0, 0 );
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send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
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NULL, "sasl mechanism not supported", NULL, NULL );
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goto cleanup;
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}
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ldap_pvt_thread_mutex_lock( &conn->c_mutex );
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if ( conn->c_authmech != NULL ) {
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assert( conn->c_bind_in_progress );
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if((strcmp(conn->c_authmech, mech) != 0)) {
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/* mechanism changed, cancel in progress bind */
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conn->c_bind_in_progress = 0;
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if( conn->c_authstate != NULL ) {
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free(conn->c_authstate);
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conn->c_authstate = NULL;
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}
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free(conn->c_authmech);
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conn->c_authmech = NULL;
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}
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#ifdef LDAP_DEBUG
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} else {
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assert( !conn->c_bind_in_progress );
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assert( conn->c_authmech == NULL );
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assert( conn->c_authstate == NULL );
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#endif
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}
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} else {
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ldap_pvt_thread_mutex_lock( &conn->c_mutex );
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if ( conn->c_authmech != NULL ) {
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assert( conn->c_bind_in_progress );
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/* cancel in progress bind */
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conn->c_bind_in_progress = 0;
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if( conn->c_authstate != NULL ) {
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free(conn->c_authstate);
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conn->c_authstate = NULL;
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}
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free(conn->c_authmech);
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conn->c_authmech = NULL;
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}
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}
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conn->c_protocol = version;
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ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
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/* accept null binds */
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if ( ndn == NULL || *ndn == '\0' ) {
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/*
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* we already forced connection to "anonymous", we just
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* need to send success
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*/
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send_ldap_result( conn, op, LDAP_SUCCESS,
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NULL, NULL, NULL, NULL );
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goto cleanup;
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}
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/*
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* We could be serving multiple database backends. Select the
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* appropriate one, or send a referral to our "referral server"
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* if we don't hold it.
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*/
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if ( (be = select_backend( ndn )) == NULL ) {
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if ( cred.bv_len == 0 ) {
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send_ldap_result( conn, op, LDAP_SUCCESS,
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NULL, NULL, NULL, NULL );
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} else if ( default_referral ) {
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send_ldap_result( conn, op, rc = LDAP_REFERRAL,
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NULL, NULL, default_referral, NULL );
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} else {
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/* noSuchObject is not allowed to be returned by bind */
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send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
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NULL, NULL, NULL, NULL );
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}
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goto cleanup;
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}
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if ( be->be_bind ) {
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/* alias suffix */
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char *edn = NULL;
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/* deref suffix alias if appropriate */
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ndn = suffix_alias( be, ndn );
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if ( (*be->be_bind)( be, conn, op, dn, ndn, method, mech, &cred, &edn ) == 0 ) {
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ldap_pvt_thread_mutex_lock( &conn->c_mutex );
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conn->c_cdn = dn;
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dn = NULL;
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if(edn != NULL) {
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conn->c_dn = edn;
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} else {
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conn->c_dn = ndn;
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ndn = NULL;
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}
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Debug( LDAP_DEBUG_TRACE, "do_bind: bound \"%s\" to \"%s\"\n",
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conn->c_cdn, conn->c_dn, method );
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ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
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/* send this here to avoid a race condition */
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send_ldap_result( conn, op, LDAP_SUCCESS,
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NULL, NULL, NULL, NULL );
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} else if (edn != NULL) {
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free( edn );
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}
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} else {
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send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
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NULL, "Function not implemented", NULL, NULL );
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}
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cleanup:
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if( dn != NULL ) {
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free( dn );
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}
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if( ndn != NULL ) {
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free( ndn );
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}
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if ( mech != NULL ) {
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free( mech );
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}
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if ( cred.bv_val != NULL ) {
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free( cred.bv_val );
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}
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return rc;
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}
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