mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
531 lines
11 KiB
C
531 lines
11 KiB
C
/* $OpenLDAP$ */
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/*
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* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#include "portable.h"
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#include <ac/stdlib.h>
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#include <stdio.h>
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#include "slap.h"
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#include "proto-slap.h"
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#include <lber.h>
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#include <ldap_log.h>
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#ifdef HAVE_CYRUS_SASL
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#include <limits.h>
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#include <sasl.h>
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#include <ldap_pvt.h>
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#ifdef SLAPD_SPASSWD
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#include <lutil.h>
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#endif
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static sasl_security_properties_t sasl_secprops;
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static int
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slap_sasl_log(
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void *context,
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int priority,
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const char *message)
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{
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Connection *conn = context;
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int level;
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const char * label;
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if ( message == NULL ) {
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return SASL_BADPARAM;
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}
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switch (priority) {
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case SASL_LOG_ERR:
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level = LDAP_DEBUG_ANY;
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label = "Error";
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break;
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case SASL_LOG_WARNING:
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level = LDAP_DEBUG_TRACE;
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label = "Warning";
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break;
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case SASL_LOG_INFO:
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level = LDAP_DEBUG_TRACE;
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label = "Info";
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break;
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default:
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return SASL_BADPARAM;
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}
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Debug( level, "SASL [conn=%d] %s: %s\n",
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conn ? conn->c_connid: -1,
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label, message );
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return SASL_OK;
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}
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static int
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slap_sasl_authorize(
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void *context,
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const char *authcid,
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const char *authzid,
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const char **user,
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const char **errstr)
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{
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char *cuser;
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int rc;
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Connection *conn = context;
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*user = NULL;
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if ( authcid == NULL || *authcid == '\0' ) {
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*errstr = "empty authentication identity";
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Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
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"empty authentication identity\n",
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(long) (conn ? conn->c_connid : -1),
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0, 0 );
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return SASL_BADAUTH;
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}
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Debug( LDAP_DEBUG_ARGS, "SASL Authorize [conn=%ld]: "
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"authcid=\"%s\" authzid=\"%s\"\n",
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(long) (conn ? conn->c_connid : -1),
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authcid ? authcid : "<empty>",
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authzid ? authzid : "<empty>" );
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if ( authzid == NULL || *authzid == '\0' ||
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strcmp( authcid, authzid ) == 0 )
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{
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size_t len = sizeof("u:") + strlen( authcid );
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cuser = ch_malloc( len );
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strcpy( cuser, "u:" );
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strcpy( &cuser[sizeof("u:")-1], authcid );
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*user = cuser;
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Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
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"\"%s\" as \"%s\"\n",
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(long) (conn ? conn->c_connid : -1),
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authcid, cuser );
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return SASL_OK;
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}
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rc = slap_sasl_authorized( conn, authcid, authzid );
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Debug( LDAP_DEBUG_TRACE, "SASL Authorization returned %d\n", rc,0,0);
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if( rc ) {
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*errstr = "not authorized";
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return SASL_NOAUTHZ;
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}
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cuser = ch_strdup( authzid );
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dn_normalize( cuser );
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*errstr = NULL;
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*user = cuser;
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return SASL_OK;
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}
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static int
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slap_sasl_err2ldap( int saslerr )
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{
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int rc;
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switch (saslerr) {
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case SASL_CONTINUE:
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rc = LDAP_SASL_BIND_IN_PROGRESS;
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break;
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case SASL_FAIL:
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rc = LDAP_OTHER;
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break;
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case SASL_NOMEM:
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rc = LDAP_OTHER;
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break;
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case SASL_NOMECH:
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rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
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break;
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case SASL_BADAUTH:
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rc = LDAP_INVALID_CREDENTIALS;
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break;
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case SASL_NOAUTHZ:
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rc = LDAP_INSUFFICIENT_ACCESS;
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break;
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case SASL_TOOWEAK:
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case SASL_ENCRYPT:
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rc = LDAP_INAPPROPRIATE_AUTH;
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break;
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default:
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rc = LDAP_OTHER;
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break;
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}
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return rc;
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}
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#endif
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int slap_sasl_init( void )
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{
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#ifdef HAVE_CYRUS_SASL
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int rc;
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sasl_conn_t *server = NULL;
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static sasl_callback_t server_callbacks[] = {
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{ SASL_CB_LOG, &slap_sasl_log, NULL },
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{ SASL_CB_LIST_END, NULL, NULL }
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};
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sasl_set_alloc(
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ch_malloc,
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ch_calloc,
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ch_realloc,
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ch_free );
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sasl_set_mutex(
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ldap_pvt_sasl_mutex_new,
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ldap_pvt_sasl_mutex_lock,
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ldap_pvt_sasl_mutex_unlock,
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ldap_pvt_sasl_mutex_dispose );
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/* should provide callbacks for logging */
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/* server name should be configurable */
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rc = sasl_server_init( server_callbacks, "slapd" );
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if( rc != SASL_OK ) {
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Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
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0, 0, 0 );
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return -1;
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}
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Debug( LDAP_DEBUG_TRACE, "slap_sasl_init: initialized!\n",
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0, 0, 0 );
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/* default security properties */
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memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
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sasl_secprops.max_ssf = INT_MAX;
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sasl_secprops.maxbufsize = 65536;
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sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
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sasl_dispose( &server );
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#endif
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return 0;
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}
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int slap_sasl_destroy( void )
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{
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#ifdef HAVE_CYRUS_SASL
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sasl_done();
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#endif
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return 0;
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}
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int slap_sasl_open( Connection *conn )
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{
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int sc = LDAP_SUCCESS;
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#ifdef HAVE_CYRUS_SASL
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sasl_conn_t *ctx = NULL;
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sasl_callback_t *session_callbacks;
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assert( conn->c_sasl_context == NULL );
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assert( conn->c_sasl_extra == NULL );
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conn->c_sasl_layers = 0;
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session_callbacks =
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ch_calloc( 3, sizeof(sasl_callback_t));
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conn->c_sasl_extra = session_callbacks;
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session_callbacks[0].id = SASL_CB_LOG;
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session_callbacks[0].proc = &slap_sasl_log;
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session_callbacks[0].context = conn;
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session_callbacks[1].id = SASL_CB_PROXY_POLICY;
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session_callbacks[1].proc = &slap_sasl_authorize;
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session_callbacks[1].context = conn;
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session_callbacks[2].id = SASL_CB_LIST_END;
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session_callbacks[2].proc = NULL;
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session_callbacks[2].context = NULL;
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if( global_host == NULL ) {
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global_host = ldap_pvt_get_fqdn( NULL );
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}
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/* create new SASL context */
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sc = sasl_server_new( "ldap", global_host, global_realm,
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session_callbacks, SASL_SECURITY_LAYER, &ctx );
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if( sc != SASL_OK ) {
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Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
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sc, 0, 0 );
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return -1;
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}
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conn->c_sasl_context = ctx;
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if( sc == SASL_OK ) {
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sc = sasl_setprop( ctx,
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SASL_SEC_PROPS, &sasl_secprops );
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if( sc != SASL_OK ) {
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Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
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sc, 0, 0 );
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slap_sasl_close( conn );
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return -1;
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}
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}
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sc = slap_sasl_err2ldap( sc );
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#endif
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return sc;
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}
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int slap_sasl_external(
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Connection *conn,
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slap_ssf_t ssf,
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const char *auth_id )
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{
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#ifdef HAVE_CYRUS_SASL
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int sc;
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sasl_conn_t *ctx = conn->c_sasl_context;
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sasl_external_properties_t extprops;
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if ( ctx == NULL ) {
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return LDAP_UNAVAILABLE;
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}
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memset( &extprops, '\0', sizeof(extprops) );
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extprops.ssf = ssf;
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extprops.auth_id = (char *) auth_id;
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sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
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(void *) &extprops );
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if ( sc != SASL_OK ) {
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return LDAP_OTHER;
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}
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#endif
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return LDAP_SUCCESS;
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}
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int slap_sasl_reset( Connection *conn )
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{
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#ifdef HAVE_CYRUS_SASL
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sasl_conn_t *ctx = conn->c_sasl_context;
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if( ctx != NULL ) {
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}
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#endif
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/* must return "anonymous" */
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return LDAP_SUCCESS;
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}
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char ** slap_sasl_mechs( Connection *conn )
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{
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char **mechs = NULL;
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#ifdef HAVE_CYRUS_SASL
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sasl_conn_t *ctx = conn->c_sasl_context;
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if( ctx != NULL ) {
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int sc;
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char *mechstr;
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sc = sasl_listmech( ctx,
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NULL, NULL, ",", NULL,
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&mechstr, NULL, NULL );
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if( sc != SASL_OK ) {
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Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
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sc, 0, 0 );
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return NULL;
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}
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mechs = str2charray( mechstr, "," );
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ch_free( mechstr );
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}
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#endif
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return mechs;
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}
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int slap_sasl_close( Connection *conn )
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{
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#ifdef HAVE_CYRUS_SASL
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sasl_conn_t *ctx = conn->c_sasl_context;
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if( ctx != NULL ) {
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sasl_dispose( &ctx );
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}
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conn->c_sasl_context = NULL;
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free( conn->c_sasl_extra );
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conn->c_sasl_extra = NULL;
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#endif
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return LDAP_SUCCESS;
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}
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int slap_sasl_bind(
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Connection *conn,
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Operation *op,
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const char *dn,
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const char *ndn,
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struct berval *cred,
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char **edn,
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slap_ssf_t *ssfp )
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{
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int rc = 1;
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#ifdef HAVE_CYRUS_SASL
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sasl_conn_t *ctx = conn->c_sasl_context;
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struct berval response;
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unsigned reslen;
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const char *errstr;
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int sc;
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Debug(LDAP_DEBUG_ARGS,
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"==> sasl_bind: dn=\"%s\" mech=%s datalen=%d\n", dn,
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conn->c_sasl_bind_in_progress ? "<continuing>":conn->c_sasl_bind_mech,
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cred ? cred->bv_len : 0 );
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if( ctx == NULL ) {
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send_ldap_result( conn, op, LDAP_UNAVAILABLE,
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NULL, "SASL unavailable on this session", NULL, NULL );
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return rc;
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}
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if ( !conn->c_sasl_bind_in_progress ) {
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sc = sasl_server_start( ctx,
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conn->c_sasl_bind_mech,
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cred->bv_val, cred->bv_len,
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(char **)&response.bv_val, &reslen, &errstr );
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} else {
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sc = sasl_server_step( ctx,
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cred->bv_val, cred->bv_len,
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(char **)&response.bv_val, &reslen, &errstr );
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}
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response.bv_len = reslen;
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if ( sc == SASL_OK ) {
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char *username = NULL;
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sc = sasl_getprop( ctx,
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SASL_USERNAME, (void **)&username );
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if ( sc != SASL_OK ) {
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Debug(LDAP_DEBUG_TRACE,
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"slap_sasl_bind: getprop(USERNAME) failed!\n",
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0, 0, 0);
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send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
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NULL, "no SASL username", NULL, NULL );
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} else if ( username == NULL || *username == '\0' ) {
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Debug(LDAP_DEBUG_TRACE,
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"slap_sasl_bind: getprop(USERNAME) returned NULL!\n",
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0, 0, 0);
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send_ldap_result( conn, op, rc = LDAP_INSUFFICIENT_ACCESS,
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NULL, "no SASL username", NULL, NULL );
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} else {
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char *realm = NULL;
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sasl_ssf_t *ssf = NULL;
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(void) sasl_getprop( ctx,
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SASL_REALM, (void **)&realm );
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(void) sasl_getprop( ctx,
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SASL_SSF, (void *)&ssf );
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Debug(LDAP_DEBUG_TRACE,
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"slap_sasl_bind: username=\"%s\" realm=\"%s\" ssf=%lu\n",
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username ? username : "",
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realm ? realm : "",
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(unsigned long) ( ssf ? *ssf : 0 ) );
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*ssfp = ssf ? *ssf : 0;
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rc = LDAP_SUCCESS;
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if( username == NULL || (
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!strncasecmp( username, "anonymous", sizeof("anonymous")-1 ) &&
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( username[sizeof("anonymous")-1] == '\0' ||
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username[sizeof("anonymous")-1] == '@' ) ) )
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{
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Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: anonymous\n",
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0, 0, 0);
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} else if ( username[0] == 'u' && username[1] == ':'
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&& username[2] != '\0'
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&& strpbrk( &username[2], "+=,;\"\\ \t") == NULL )
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{
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*edn = ch_malloc( sizeof( "uid= + realm=" )
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+ strlen( &username[2] )
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+ ( realm ? strlen( realm ) : 0 ) );
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strcpy( *edn, "uid=" );
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strcat( *edn, &username[2] );
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if( realm && *realm ) {
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strcat( *edn, " + realm=" );
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strcat( *edn, realm );
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}
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Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: authzdn: \"%s\"\n",
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*edn, 0, 0);
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}
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if( rc == LDAP_SUCCESS ) {
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send_ldap_sasl( conn, op, rc,
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NULL, NULL, NULL, NULL,
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response.bv_len ? &response : NULL );
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} else {
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send_ldap_result( conn, op, rc,
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NULL, errstr, NULL, NULL );
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}
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}
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} else if ( sc == SASL_CONTINUE ) {
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send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
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NULL, NULL, NULL, NULL, &response );
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} else {
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send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
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NULL, errstr, NULL, NULL );
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}
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Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
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#else
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send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
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NULL, "SASL not supported", NULL, NULL );
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#endif
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return rc;
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}
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char* slap_sasl_secprops( const char *in )
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{
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#ifdef HAVE_CYRUS_SASL
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int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
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return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
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#else
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return "SASL not supported";
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#endif
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}
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