openldap/servers/slapd/bind.c
2000-07-28 00:04:07 +00:00

382 lines
8.7 KiB
C

/* bind.c - decode an ldap bind operation and pass it to a backend db */
/* $OpenLDAP$ */
/*
* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
/*
* Copyright (c) 1995 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include <ac/socket.h>
#include "ldap_pvt.h"
#include "slap.h"
int
do_bind(
Connection *conn,
Operation *op
)
{
BerElement *ber = op->o_ber;
ber_int_t version;
ber_tag_t method;
char *mech;
char *saslmech;
char *dn;
char *ndn;
ber_tag_t tag;
int rc = LDAP_SUCCESS;
const char *text;
struct berval cred;
Backend *be;
Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
dn = NULL;
ndn = NULL;
mech = NULL;
cred.bv_val = NULL;
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
/*
* Force to connection to "anonymous" until bind succeeds.
*/
if ( conn->c_cdn != NULL ) {
free( conn->c_cdn );
conn->c_cdn = NULL;
}
if ( conn->c_dn != NULL ) {
free( conn->c_dn );
conn->c_dn = NULL;
}
conn->c_authc_backend = NULL;
conn->c_authz_backend = NULL;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
if ( op->o_dn != NULL ) {
free( op->o_dn );
op->o_dn = ch_strdup( "" );
}
if ( op->o_ndn != NULL ) {
free( op->o_ndn );
op->o_ndn = ch_strdup( "" );
}
/*
* Parse the bind request. It looks like this:
*
* BindRequest ::= SEQUENCE {
* version INTEGER, -- version
* name DistinguishedName, -- dn
* authentication CHOICE {
* simple [0] OCTET STRING -- passwd
* krbv42ldap [1] OCTET STRING
* krbv42dsa [2] OCTET STRING
* SASL [3] SaslCredentials
* }
* }
*
* SaslCredentials ::= SEQUENCE {
* mechanism LDAPString,
* credentials OCTET STRING OPTIONAL
* }
*/
tag = ber_scanf( ber, "{iat" /*}*/, &version, &dn, &method );
if ( tag == LBER_ERROR ) {
Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR, "decoding error" );
rc = -1;
goto cleanup;
}
op->o_protocol = version;
if( method != LDAP_AUTH_SASL ) {
tag = ber_scanf( ber, /*{*/ "o}", &cred );
} else {
tag = ber_scanf( ber, "{a" /*}*/, &mech );
if ( tag != LBER_ERROR ) {
ber_len_t len;
tag = ber_peek_tag( ber, &len );
if ( tag == LDAP_TAG_LDAPCRED ) {
tag = ber_scanf( ber, "o", &cred );
}
if ( tag != LBER_ERROR ) {
tag = ber_scanf( ber, /*{{*/ "}}" );
}
}
}
if ( tag == LBER_ERROR ) {
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR,
"decoding error" );
rc = SLAPD_DISCONNECT;
goto cleanup;
}
if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
goto cleanup;
}
ndn = ch_strdup( dn );
if ( dn_normalize( ndn ) == NULL ) {
Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn, 0, 0 );
send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
"invalid DN", NULL, NULL );
goto cleanup;
}
if( method == LDAP_AUTH_SASL ) {
Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
dn, mech, NULL );
} else {
Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n",
(unsigned long) version, dn, (unsigned long) method );
}
Statslog( LDAP_DEBUG_STATS, "conn=%ld op=%d BIND dn=\"%s\" method=%ld\n",
op->o_connid, op->o_opid, ndn, (unsigned long) method, 0 );
if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
(unsigned long) version, 0, 0 );
send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
NULL, "requested protocol version not supported", NULL, NULL );
goto cleanup;
}
/* we set connection version regardless of whether bind succeeds
* or not.
*/
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
conn->c_protocol = version;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
if ( method == LDAP_AUTH_SASL ) {
char *edn;
unsigned long ssf = 0;
if ( version < LDAP_VERSION3 ) {
Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
(unsigned long) version, 0, 0 );
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
rc = SLAPD_DISCONNECT;
goto cleanup;
}
if( mech == NULL || *mech == '\0' ) {
Debug( LDAP_DEBUG_ANY,
"do_bind: no sasl mechanism provided\n",
0, 0, 0 );
send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
NULL, "no SASL mechanism provided", NULL, NULL );
goto cleanup;
}
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if ( conn->c_sasl_bind_mech != NULL ) {
/* SASL bind is in progress */
saslmech = NULL;
if((strcmp(conn->c_sasl_bind_mech, mech) != 0)) {
/* mechanism changed */
slap_sasl_reset(conn);
}
free( conn->c_sasl_bind_mech );
conn->c_sasl_bind_mech = NULL;
#ifdef LDAP_DEBUG
} else {
/* SASL bind is NOT in progress */
saslmech = mech;
assert( conn->c_sasl_bind_mech == NULL );
#endif
}
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
edn = NULL;
rc = slap_sasl_bind( conn, op, dn, ndn, saslmech, &cred,
&edn, &ssf );
if( rc == LDAP_SUCCESS ) {
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
conn->c_dn = edn;
conn->c_authmech = mech;
if( ssf ) conn->c_sasl_layers++;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
} else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
conn->c_sasl_bind_mech = mech;
}
mech = NULL;
goto cleanup;
} else {
/* Not SASL, cancel any in-progress bind */
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if ( conn->c_sasl_bind_mech != NULL ) {
assert( conn->c_sasl_bind_in_progress );
free(conn->c_sasl_bind_mech);
conn->c_sasl_bind_mech = NULL;
} else {
assert( !conn->c_sasl_bind_in_progress );
}
slap_sasl_reset( conn );
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
}
/* accept "anonymous" binds */
if ( cred.bv_len == 0 || ndn == NULL || *ndn == '\0' ) {
/*
* we already forced connection to "anonymous",
* just need to send success
*/
send_ldap_result( conn, op, LDAP_SUCCESS,
NULL, NULL, NULL, NULL );
Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
version, 0, 0 );
goto cleanup;
}
/*
* We could be serving multiple database backends. Select the
* appropriate one, or send a referral to our "referral server"
* if we don't hold it.
*/
if ( (be = select_backend( ndn )) == NULL ) {
if ( default_referral ) {
send_ldap_result( conn, op, rc = LDAP_REFERRAL,
NULL, NULL, default_referral, NULL );
} else {
/* noSuchObject is not allowed to be returned by bind */
send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
NULL, NULL, NULL, NULL );
}
goto cleanup;
}
conn->c_authz_backend = be;
/* make sure this backend recongizes critical controls */
rc = backend_check_controls( be, conn, op, &text ) ;
if( rc != LDAP_SUCCESS ) {
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
goto cleanup;
}
if ( be->be_bind ) {
int ret;
/* alias suffix */
char *edn = NULL;
/* deref suffix alias if appropriate */
ndn = suffix_alias( be, ndn );
ret = (*be->be_bind)( be, conn, op, dn, ndn,
method, &cred, &edn );
if ( ret == 0 ) {
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
conn->c_cdn = dn;
dn = NULL;
if(edn != NULL) {
conn->c_dn = edn;
} else {
conn->c_dn = ndn;
ndn = NULL;
}
Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n",
version, conn->c_cdn, conn->c_dn );
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
/* send this here to avoid a race condition */
send_ldap_result( conn, op, LDAP_SUCCESS,
NULL, NULL, NULL, NULL );
} else if (edn != NULL) {
free( edn );
}
} else {
send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
NULL, "operation not supported within namingContext", NULL, NULL );
}
cleanup:
if( rc != LDAP_SASL_BIND_IN_PROGRESS ) {
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
/* dispose of mech */
free( conn->c_sasl_bind_mech );
conn->c_sasl_bind_mech = NULL;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
}
if( dn != NULL ) {
free( dn );
}
if( ndn != NULL ) {
free( ndn );
}
if ( mech != NULL ) {
free( mech );
}
if ( cred.bv_val != NULL ) {
free( cred.bv_val );
}
return rc;
}