openldap/servers/slapd/sasl.c
Kurt Zeilenga 5fc22599e2 Update SASL code to reuse context through life of session.
Replace 'negotiated' with 'interactive' bind
Add hooks for SASL/EXTERNAL
Disable SASL security layers
Rework SASL command line and config file parameters
2000-07-13 22:54:38 +00:00

404 lines
7.8 KiB
C

/* $OpenLDAP$ */
/*
* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
#include "portable.h"
#include <ac/stdlib.h>
#include <stdio.h>
#include "slap.h"
#include "proto-slap.h"
#include <lber.h>
#include <ldap_log.h>
#ifdef HAVE_CYRUS_SASL
#include <limits.h>
#include <sasl.h>
#include <ldap_pvt.h>
#ifdef SLAPD_SPASSWD
#include <lutil.h>
#endif
static char *sasl_host = NULL;
static sasl_security_properties_t sasl_secprops;
static int
slap_sasl_err2ldap( int saslerr )
{
int rc;
switch (saslerr) {
case SASL_CONTINUE:
rc = LDAP_SASL_BIND_IN_PROGRESS;
break;
case SASL_FAIL:
rc = LDAP_OTHER;
break;
case SASL_NOMEM:
rc = LDAP_OTHER;
break;
case SASL_NOMECH:
rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
break;
case SASL_BADAUTH:
rc = LDAP_INVALID_CREDENTIALS;
break;
case SASL_NOAUTHZ:
rc = LDAP_INSUFFICIENT_ACCESS;
break;
case SASL_TOOWEAK:
case SASL_ENCRYPT:
rc = LDAP_INAPPROPRIATE_AUTH;
break;
default:
rc = LDAP_OTHER;
break;
}
return rc;
}
#endif
int slap_sasl_init( void )
{
#ifdef HAVE_CYRUS_SASL
int rc;
sasl_conn_t *server = NULL;
static sasl_callback_t server_callbacks[] = {
{ SASL_CB_LIST_END, NULL, NULL }
};
sasl_set_alloc(
ch_malloc,
ch_calloc,
ch_realloc,
ch_free );
sasl_set_mutex(
ldap_pvt_sasl_mutex_new,
ldap_pvt_sasl_mutex_lock,
ldap_pvt_sasl_mutex_unlock,
ldap_pvt_sasl_mutex_dispose );
/* should provide callbacks for logging */
/* server name should be configurable */
rc = sasl_server_init( server_callbacks, "slapd" );
if( rc != SASL_OK ) {
Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
0, 0, 0 );
return -1;
}
if( sasl_host == NULL ) {
static char hostname[MAXHOSTNAMELEN+1];
if( gethostname( hostname, MAXHOSTNAMELEN ) == 0 ) {
hostname[MAXHOSTNAMELEN] = '\0';
sasl_host = hostname;
}
}
Debug( LDAP_DEBUG_TRACE,
"slap_sasl_init: %s initialized!\n",
sasl_host, 0, 0 );
/* default security properties */
memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
sasl_secprops.max_ssf = UINT_MAX;
sasl_secprops.maxbufsize = 65536;
sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
#ifdef SLAPD_SPASSWD
lutil_passwd_sasl_conn = server;
#else
sasl_dispose( &server );
#endif
#endif
return 0;
}
int slap_sasl_destroy( void )
{
#ifdef HAVE_CYRUS_SASL
#ifdef SLAPD_SPASSWD
sasl_dispose( &lutil_passwd_sasl_conn );
#endif
sasl_done();
#endif
return 0;
}
int slap_sasl_open( Connection *conn )
{
int sc = LDAP_SUCCESS;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = NULL;
/* create new SASL context */
sc = sasl_server_new( "ldap", sasl_host, global_realm, NULL,
#ifdef LDAP_SASL_SECURITY_LAYER
SASL_SECURITY_LAYER,
#else
0,
#endif
&ctx );
if( sc != SASL_OK ) {
Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
sc, 0, 0 );
return -1;
}
conn->c_sasl_context = ctx;
if( sc == SASL_OK ) {
sc = sasl_setprop( ctx,
SASL_SEC_PROPS, &sasl_secprops );
if( sc != SASL_OK ) {
Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
sc, 0, 0 );
slap_sasl_close( conn );
return -1;
}
}
sc = slap_sasl_err2ldap( sc );
#endif
return sc;
}
int slap_sasl_external(
Connection *conn,
unsigned ssf,
char *auth_id )
{
#ifdef HAVE_CYRUS_SASL
int sc;
sasl_conn_t *ctx = conn->c_sasl_context;
sasl_external_properties_t extprops;
if ( ctx == NULL ) {
return LDAP_UNAVAILABLE;
}
memset( &extprops, 0L, sizeof(extprops) );
extprops.ssf = ssf;
extprops.auth_id = auth_id;
sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
(void *) &extprops );
if ( sc != SASL_OK ) {
return LDAP_OTHER;
}
#endif
return LDAP_SUCCESS;
}
int slap_sasl_reset( Connection *conn )
{
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
}
#endif
/* must return "anonymous" */
return LDAP_SUCCESS;
}
char ** slap_sasl_mechs( Connection *conn )
{
char **mechs = NULL;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
int sc;
char *mechstr;
sc = sasl_listmech( ctx,
NULL, NULL, ",", NULL,
&mechstr, NULL, NULL );
if( sc != SASL_OK ) {
Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
sc, 0, 0 );
return NULL;
}
mechs = str2charray( mechstr, "," );
ch_free( mechstr );
}
#endif
return mechs;
}
int slap_sasl_close( Connection *conn )
{
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
sasl_dispose( &ctx );
}
conn->c_sasl_context = NULL;
#endif
return LDAP_SUCCESS;
}
int slap_sasl_bind(
Connection *conn,
Operation *op,
const char *dn,
const char *ndn,
const char *mech,
struct berval *cred,
char **edn )
{
int rc = 1;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
struct berval response;
unsigned reslen;
const char *errstr;
int sc;
Debug(LDAP_DEBUG_ARGS,
"==> sasl_bind: dn=\"%s\" mech=%s cred->bv_len=%d\n",
dn, mech, cred ? cred->bv_len : 0 );
if( ctx == NULL ) {
send_ldap_result( conn, op, LDAP_UNAVAILABLE,
NULL, "SASL unavailable on this session", NULL, NULL );
return rc;
}
if ( mech != NULL ) {
sc = sasl_server_start( ctx,
mech,
cred->bv_val, cred->bv_len,
(char **)&response.bv_val, &reslen, &errstr );
} else {
sc = sasl_server_step( ctx,
cred->bv_val, cred->bv_len,
(char **)&response.bv_val, &reslen, &errstr );
}
response.bv_len = reslen;
if ( sc == SASL_OK ) {
char *username = NULL;
sc = sasl_getprop( ctx,
SASL_USERNAME, (void **)&username );
if ( sc != SASL_OK ) {
Debug(LDAP_DEBUG_TRACE,
"slap_sasl_bind: getprop(USERNAME) failed!\n",
0, 0, 0);
send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
NULL, "no SASL username", NULL, NULL );
} else if ( username == NULL || *username == '\0' ) {
Debug(LDAP_DEBUG_TRACE,
"slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
0, 0, 0);
send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
NULL, "no SASL username", NULL, NULL );
} else {
char *realm = NULL;
sasl_ssf_t ssf = 0;
(void) sasl_getprop( ctx,
SASL_REALM, (void **)&realm );
(void) sasl_getprop( ctx,
SASL_SSF, (void *)&ssf );
Debug(LDAP_DEBUG_TRACE,
"slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
username ? username : "",
realm ? realm : "",
(unsigned long) ssf );
if( !strncasecmp( username, "anonymous", sizeof("anonyous")-1 ) &&
( ( username[sizeof("anonymous")] == '\0' ) ||
( username[sizeof("anonymous")] == '@' ) ) )
{
Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
0, 0, 0);
} else {
*edn = ch_malloc( sizeof( "uid= + realm=" )
+ ( username ? strlen( username ) : 0 )
+ ( realm ? strlen( realm ) : 0 ) );
strcpy( *edn, "uid=" );
strcat( *edn, username );
if( realm && *realm ) {
strcat( *edn, " + realm=" );
strcat( *edn, realm );
}
Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
*edn, 0, 0);
}
send_ldap_sasl( conn, op, rc = LDAP_SUCCESS,
NULL, NULL, NULL, NULL, &response );
}
} else if ( sc == SASL_CONTINUE ) {
send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
NULL, NULL, NULL, NULL, &response );
} else {
send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
NULL, errstr, NULL, NULL );
}
Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
#else
send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
NULL, "SASL not supported", NULL, NULL );
#endif
return rc;
}
char* slap_sasl_secprops( const char *in )
{
#ifdef HAVE_CYRUS_SASL
int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
#else
return "SASL not supported";
#endif
}