mirror of
https://git.openldap.org/openldap/openldap.git
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de91bde800
names, we're only concerned with OpenSSL these days.
1258 lines
28 KiB
C
1258 lines
28 KiB
C
/* tls_o.c - Handle tls/ssl using OpenSSL */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2008-2009 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* ACKNOWLEDGEMENTS: Rewritten by Howard Chu
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*/
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#include "portable.h"
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#ifdef HAVE_OPENSSL
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#include "ldap_config.h"
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#include <stdio.h>
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#include <ac/stdlib.h>
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#include <ac/errno.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/ctype.h>
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#include <ac/time.h>
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#include <ac/unistd.h>
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#include <ac/param.h>
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#include <ac/dirent.h>
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#include "ldap-int.h"
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#include "ldap-tls.h"
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#ifdef LDAP_R_COMPILE
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#include <ldap_pvt_thread.h>
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#endif
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#ifdef HAVE_OPENSSL_SSL_H
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#include <openssl/ssl.h>
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#include <openssl/x509v3.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/safestack.h>
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#elif defined( HAVE_SSL_H )
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#include <ssl.h>
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#endif
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typedef SSL_CTX tlso_ctx;
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typedef SSL tlso_session;
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static int tlso_opt_trace = 1;
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static void tlso_report_error( void );
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static void tlso_info_cb( const SSL *ssl, int where, int ret );
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static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
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static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
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static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
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static DH * tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
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typedef struct dhplist {
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struct dhplist *next;
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int keylength;
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DH *param;
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} dhplist;
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static dhplist *tlso_dhparams;
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static int tlso_seed_PRNG( const char *randfile );
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#ifdef LDAP_R_COMPILE
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/*
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* provide mutexes for the OpenSSL library.
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*/
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static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS];
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static ldap_pvt_thread_mutex_t tlso_dh_mutex;
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static void tlso_locking_cb( int mode, int type, const char *file, int line )
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{
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if ( mode & CRYPTO_LOCK ) {
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ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
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} else {
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ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
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}
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}
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static unsigned long tlso_thread_self( void )
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{
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/* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
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* is an integral type that fits in an unsigned long
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*/
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/* force an error if the ldap_pvt_thread_t type is too large */
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enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
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typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];
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return (unsigned long) ldap_pvt_thread_self();
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}
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static void tlso_thr_init( void )
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{
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int i;
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for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
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ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
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}
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ldap_pvt_thread_mutex_init( &tlso_dh_mutex );
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CRYPTO_set_locking_callback( tlso_locking_cb );
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CRYPTO_set_id_callback( tlso_thread_self );
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}
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#endif /* LDAP_R_COMPILE */
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static STACK_OF(X509_NAME) *
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tlso_ca_list( char * bundle, char * dir )
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{
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STACK_OF(X509_NAME) *ca_list = NULL;
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if ( bundle ) {
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ca_list = SSL_load_client_CA_file( bundle );
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}
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#if defined(HAVE_DIRENT_H) || defined(dirent)
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if ( dir ) {
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int freeit = 0;
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if ( !ca_list ) {
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ca_list = sk_X509_NAME_new_null();
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freeit = 1;
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}
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if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
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freeit ) {
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sk_X509_NAME_free( ca_list );
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ca_list = NULL;
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}
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}
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#endif
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return ca_list;
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}
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/*
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* Initialize TLS subsystem. Should be called only once.
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*/
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static int
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tlso_init( void )
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{
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struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
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#ifdef HAVE_EBCDIC
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{
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char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
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if ( file ) __atoe( file );
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(void) tlso_seed_PRNG( file );
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LDAP_FREE( file );
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}
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#else
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(void) tlso_seed_PRNG( lo->ldo_tls_randfile );
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#endif
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SSL_load_error_strings();
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SSL_library_init();
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OpenSSL_add_all_digests();
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/* FIXME: mod_ssl does this */
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X509V3_add_standard_extensions();
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return 0;
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}
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/*
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* Tear down the TLS subsystem. Should only be called once.
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*/
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static void
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tlso_destroy( void )
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{
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struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
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EVP_cleanup();
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ERR_remove_state(0);
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ERR_free_strings();
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if ( lo->ldo_tls_randfile ) {
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LDAP_FREE( lo->ldo_tls_randfile );
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lo->ldo_tls_randfile = NULL;
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}
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}
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static tls_ctx *
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tlso_ctx_new( struct ldapoptions *lo )
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{
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return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
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}
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static void
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tlso_ctx_ref( tls_ctx *ctx )
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{
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tlso_ctx *c = (tlso_ctx *)ctx;
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CRYPTO_add( &c->references, 1, CRYPTO_LOCK_SSL_CTX );
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}
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static void
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tlso_ctx_free ( tls_ctx *ctx )
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{
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tlso_ctx *c = (tlso_ctx *)ctx;
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SSL_CTX_free( c );
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}
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/*
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* initialize a new TLS context
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*/
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static int
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tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
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{
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tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
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int i;
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if ( is_server ) {
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SSL_CTX_set_session_id_context( ctx,
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(const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
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}
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
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SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 );
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else if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 )
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SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 );
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if ( lo->ldo_tls_ciphersuite &&
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!SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
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{
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Debug( LDAP_DEBUG_ANY,
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"TLS: could not set cipher list %s.\n",
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lo->ldo_tls_ciphersuite, 0, 0 );
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tlso_report_error();
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return -1;
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}
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if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) {
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if ( !SSL_CTX_load_verify_locations( ctx,
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lt->lt_cacertfile, lt->lt_cacertdir ) ||
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!SSL_CTX_set_default_verify_paths( ctx ) )
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{
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Debug( LDAP_DEBUG_ANY, "TLS: "
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"could not load verify locations (file:`%s',dir:`%s').\n",
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lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
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lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
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0 );
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tlso_report_error();
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return -1;
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}
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if ( is_server ) {
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STACK_OF(X509_NAME) *calist;
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/* List of CA names to send to a client */
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calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir );
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if ( !calist ) {
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Debug( LDAP_DEBUG_ANY, "TLS: "
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"could not load client CA list (file:`%s',dir:`%s').\n",
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lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
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lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
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0 );
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tlso_report_error();
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return -1;
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}
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SSL_CTX_set_client_CA_list( ctx, calist );
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}
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}
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if ( lo->ldo_tls_certfile &&
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!SSL_CTX_use_certificate_file( ctx,
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lt->lt_certfile, SSL_FILETYPE_PEM ) )
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{
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Debug( LDAP_DEBUG_ANY,
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"TLS: could not use certificate `%s'.\n",
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lo->ldo_tls_certfile,0,0);
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tlso_report_error();
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return -1;
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}
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/* Key validity is checked automatically if cert has already been set */
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if ( lo->ldo_tls_keyfile &&
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!SSL_CTX_use_PrivateKey_file( ctx,
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lt->lt_keyfile, SSL_FILETYPE_PEM ) )
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{
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Debug( LDAP_DEBUG_ANY,
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"TLS: could not use key file `%s'.\n",
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lo->ldo_tls_keyfile,0,0);
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tlso_report_error();
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return -1;
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}
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if ( lo->ldo_tls_dhfile ) {
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DH *dh = NULL;
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BIO *bio;
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dhplist *p;
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if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
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Debug( LDAP_DEBUG_ANY,
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"TLS: could not use DH parameters file `%s'.\n",
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lo->ldo_tls_dhfile,0,0);
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tlso_report_error();
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return -1;
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}
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while (( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
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p = LDAP_MALLOC( sizeof(dhplist) );
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if ( p != NULL ) {
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p->keylength = DH_size( dh ) * 8;
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p->param = dh;
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p->next = tlso_dhparams;
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tlso_dhparams = p;
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}
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}
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BIO_free( bio );
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}
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if ( tlso_opt_trace ) {
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SSL_CTX_set_info_callback( ctx, tlso_info_cb );
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}
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i = SSL_VERIFY_NONE;
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if ( lo->ldo_tls_require_cert ) {
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i = SSL_VERIFY_PEER;
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if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
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lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
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i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
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}
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}
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SSL_CTX_set_verify( ctx, i,
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lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
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tlso_verify_ok : tlso_verify_cb );
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SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
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if ( lo->ldo_tls_dhfile ) {
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SSL_CTX_set_tmp_dh_callback( ctx, tlso_tmp_dh_cb );
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}
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#ifdef HAVE_OPENSSL_CRL
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if ( lo->ldo_tls_crlcheck ) {
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X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
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if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
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X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
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} else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
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X509_STORE_set_flags( x509_s,
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X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
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}
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}
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#endif
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return 0;
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}
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static tls_session *
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tlso_session_new( tls_ctx *ctx, int is_server )
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{
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tlso_ctx *c = (tlso_ctx *)ctx;
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return (tls_session *)SSL_new( c );
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}
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static int
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tlso_session_connect( LDAP *ld, tls_session *sess )
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{
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tlso_session *s = (tlso_session *)sess;
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/* Caller expects 0 = success, OpenSSL returns 1 = success */
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return SSL_connect( s ) - 1;
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}
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static int
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tlso_session_accept( tls_session *sess )
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{
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tlso_session *s = (tlso_session *)sess;
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/* Caller expects 0 = success, OpenSSL returns 1 = success */
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return SSL_accept( s ) - 1;
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}
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static int
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tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
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{
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tlso_session *s = (tlso_session *)sess;
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/* 1 was subtracted above, offset it back now */
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rc = SSL_get_error(s, rc+1);
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if (rc == SSL_ERROR_WANT_READ) {
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sb->sb_trans_needs_read = 1;
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return 1;
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} else if (rc == SSL_ERROR_WANT_WRITE) {
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sb->sb_trans_needs_write = 1;
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return 1;
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} else if (rc == SSL_ERROR_WANT_CONNECT) {
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return 1;
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}
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return 0;
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}
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static char *
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tlso_session_errmsg( int rc, char *buf, size_t len )
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{
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rc = ERR_peek_error();
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if ( rc ) {
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ERR_error_string_n( rc, buf, len );
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return buf;
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}
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return NULL;
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}
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static int
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tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
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{
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tlso_session *s = (tlso_session *)sess;
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X509 *x;
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X509_NAME *xn;
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x = SSL_get_certificate( s );
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if (!x) return LDAP_INVALID_CREDENTIALS;
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xn = X509_get_subject_name(x);
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der_dn->bv_len = i2d_X509_NAME( xn, NULL );
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der_dn->bv_val = xn->bytes->data;
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/* Don't X509_free, the session is still using it */
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return 0;
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}
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static X509 *
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tlso_get_cert( SSL *s )
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{
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/* If peer cert was bad, treat as if no cert was given */
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if (SSL_get_verify_result(s)) {
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return NULL;
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}
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return SSL_get_peer_certificate(s);
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}
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static int
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tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
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{
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tlso_session *s = (tlso_session *)sess;
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X509 *x = tlso_get_cert( s );
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X509_NAME *xn;
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if ( !x )
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return LDAP_INVALID_CREDENTIALS;
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xn = X509_get_subject_name(x);
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der_dn->bv_len = i2d_X509_NAME( xn, NULL );
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der_dn->bv_val = xn->bytes->data;
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X509_free(x);
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return 0;
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}
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/* what kind of hostname were we given? */
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#define IS_DNS 0
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#define IS_IP4 1
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#define IS_IP6 2
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static int
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tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
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{
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tlso_session *s = (tlso_session *)sess;
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int i, ret = LDAP_LOCAL_ERROR;
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X509 *x;
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const char *name;
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char *ptr;
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int ntype = IS_DNS;
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#ifdef LDAP_PF_INET6
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struct in6_addr addr;
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#else
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struct in_addr addr;
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#endif
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if( ldap_int_hostname &&
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( !name_in || !strcasecmp( name_in, "localhost" ) ) )
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{
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name = ldap_int_hostname;
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} else {
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name = name_in;
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}
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x = tlso_get_cert(s);
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if (!x) {
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Debug( LDAP_DEBUG_ANY,
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"TLS: unable to get peer certificate.\n",
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0, 0, 0 );
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/* If this was a fatal condition, things would have
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* aborted long before now.
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*/
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return LDAP_SUCCESS;
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}
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#ifdef LDAP_PF_INET6
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if (name[0] == '[' && strchr(name, ']')) {
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char *n2 = ldap_strdup(name+1);
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*strchr(n2, ']') = 0;
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if (inet_pton(AF_INET6, n2, &addr))
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ntype = IS_IP6;
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LDAP_FREE(n2);
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} else
|
|
#endif
|
|
if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
|
|
if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
|
|
}
|
|
|
|
i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
|
|
if (i >= 0) {
|
|
X509_EXTENSION *ex;
|
|
STACK_OF(GENERAL_NAME) *alt;
|
|
|
|
ex = X509_get_ext(x, i);
|
|
alt = X509V3_EXT_d2i(ex);
|
|
if (alt) {
|
|
int n, len1 = 0, len2 = 0;
|
|
char *domain = NULL;
|
|
GENERAL_NAME *gn;
|
|
|
|
if (ntype == IS_DNS) {
|
|
len1 = strlen(name);
|
|
domain = strchr(name, '.');
|
|
if (domain) {
|
|
len2 = len1 - (domain-name);
|
|
}
|
|
}
|
|
n = sk_GENERAL_NAME_num(alt);
|
|
for (i=0; i<n; i++) {
|
|
char *sn;
|
|
int sl;
|
|
gn = sk_GENERAL_NAME_value(alt, i);
|
|
if (gn->type == GEN_DNS) {
|
|
if (ntype != IS_DNS) continue;
|
|
|
|
sn = (char *) ASN1_STRING_data(gn->d.ia5);
|
|
sl = ASN1_STRING_length(gn->d.ia5);
|
|
|
|
/* ignore empty */
|
|
if (sl == 0) continue;
|
|
|
|
/* Is this an exact match? */
|
|
if ((len1 == sl) && !strncasecmp(name, sn, len1)) {
|
|
break;
|
|
}
|
|
|
|
/* Is this a wildcard match? */
|
|
if (domain && (sn[0] == '*') && (sn[1] == '.') &&
|
|
(len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
|
|
{
|
|
break;
|
|
}
|
|
|
|
} else if (gn->type == GEN_IPADD) {
|
|
if (ntype == IS_DNS) continue;
|
|
|
|
sn = (char *) ASN1_STRING_data(gn->d.ia5);
|
|
sl = ASN1_STRING_length(gn->d.ia5);
|
|
|
|
#ifdef LDAP_PF_INET6
|
|
if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
|
|
continue;
|
|
} else
|
|
#endif
|
|
if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
|
|
continue;
|
|
}
|
|
if (!memcmp(sn, &addr, sl)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
GENERAL_NAMES_free(alt);
|
|
if (i < n) { /* Found a match */
|
|
ret = LDAP_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ret != LDAP_SUCCESS) {
|
|
X509_NAME *xn;
|
|
char buf[2048];
|
|
buf[0] = '\0';
|
|
|
|
xn = X509_get_subject_name(x);
|
|
if( X509_NAME_get_text_by_NID( xn, NID_commonName,
|
|
buf, sizeof(buf)) == -1)
|
|
{
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"TLS: unable to get common name from peer certificate.\n",
|
|
0, 0, 0 );
|
|
ret = LDAP_CONNECT_ERROR;
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: unable to get CN from peer certificate"));
|
|
|
|
} else if (strcasecmp(name, buf) == 0 ) {
|
|
ret = LDAP_SUCCESS;
|
|
|
|
} else if (( buf[0] == '*' ) && ( buf[1] == '.' )) {
|
|
char *domain = strchr(name, '.');
|
|
if( domain ) {
|
|
size_t dlen = 0;
|
|
size_t sl;
|
|
|
|
sl = strlen(name);
|
|
dlen = sl - (domain-name);
|
|
sl = strlen(buf);
|
|
|
|
/* Is this a wildcard match? */
|
|
if ((dlen == sl-1) && !strncasecmp(domain, &buf[1], dlen)) {
|
|
ret = LDAP_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( ret == LDAP_LOCAL_ERROR ) {
|
|
Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
|
|
"common name in certificate (%s).\n",
|
|
name, buf, 0 );
|
|
ret = LDAP_CONNECT_ERROR;
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: hostname does not match CN in peer certificate"));
|
|
}
|
|
}
|
|
X509_free(x);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tlso_session_strength( tls_session *sess )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
SSL_CIPHER *c;
|
|
|
|
c = SSL_get_current_cipher(s);
|
|
return SSL_CIPHER_get_bits(c, NULL);
|
|
}
|
|
|
|
/*
|
|
* TLS support for LBER Sockbufs
|
|
*/
|
|
|
|
struct tls_data {
|
|
tlso_session *session;
|
|
Sockbuf_IO_Desc *sbiod;
|
|
};
|
|
|
|
static int
|
|
tlso_bio_create( BIO *b ) {
|
|
b->init = 1;
|
|
b->num = 0;
|
|
b->ptr = NULL;
|
|
b->flags = 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_destroy( BIO *b )
|
|
{
|
|
if ( b == NULL ) return 0;
|
|
|
|
b->ptr = NULL; /* sb_tls_remove() will free it */
|
|
b->init = 0;
|
|
b->flags = 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_read( BIO *b, char *buf, int len )
|
|
{
|
|
struct tls_data *p;
|
|
int ret;
|
|
|
|
if ( buf == NULL || len <= 0 ) return 0;
|
|
|
|
p = (struct tls_data *)b->ptr;
|
|
|
|
if ( p == NULL || p->sbiod == NULL ) {
|
|
return 0;
|
|
}
|
|
|
|
ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
|
|
|
|
BIO_clear_retry_flags( b );
|
|
if ( ret < 0 ) {
|
|
int err = sock_errno();
|
|
if ( err == EAGAIN || err == EWOULDBLOCK ) {
|
|
BIO_set_retry_read( b );
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_write( BIO *b, const char *buf, int len )
|
|
{
|
|
struct tls_data *p;
|
|
int ret;
|
|
|
|
if ( buf == NULL || len <= 0 ) return 0;
|
|
|
|
p = (struct tls_data *)b->ptr;
|
|
|
|
if ( p == NULL || p->sbiod == NULL ) {
|
|
return 0;
|
|
}
|
|
|
|
ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
|
|
|
|
BIO_clear_retry_flags( b );
|
|
if ( ret < 0 ) {
|
|
int err = sock_errno();
|
|
if ( err == EAGAIN || err == EWOULDBLOCK ) {
|
|
BIO_set_retry_write( b );
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long
|
|
tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
|
|
{
|
|
if ( cmd == BIO_CTRL_FLUSH ) {
|
|
/* The OpenSSL library needs this */
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_gets( BIO *b, char *buf, int len )
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_puts( BIO *b, const char *str )
|
|
{
|
|
return tlso_bio_write( b, str, strlen( str ) );
|
|
}
|
|
|
|
static BIO_METHOD tlso_bio_method =
|
|
{
|
|
( 100 | 0x400 ), /* it's a source/sink BIO */
|
|
"sockbuf glue",
|
|
tlso_bio_write,
|
|
tlso_bio_read,
|
|
tlso_bio_puts,
|
|
tlso_bio_gets,
|
|
tlso_bio_ctrl,
|
|
tlso_bio_create,
|
|
tlso_bio_destroy
|
|
};
|
|
|
|
static int
|
|
tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg )
|
|
{
|
|
struct tls_data *p;
|
|
BIO *bio;
|
|
|
|
assert( sbiod != NULL );
|
|
|
|
p = LBER_MALLOC( sizeof( *p ) );
|
|
if ( p == NULL ) {
|
|
return -1;
|
|
}
|
|
|
|
p->session = arg;
|
|
p->sbiod = sbiod;
|
|
bio = BIO_new( &tlso_bio_method );
|
|
bio->ptr = (void *)p;
|
|
SSL_set_bio( p->session, bio, bio );
|
|
sbiod->sbiod_pvt = p;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
|
|
{
|
|
struct tls_data *p;
|
|
|
|
assert( sbiod != NULL );
|
|
assert( sbiod->sbiod_pvt != NULL );
|
|
|
|
p = (struct tls_data *)sbiod->sbiod_pvt;
|
|
SSL_free( p->session );
|
|
LBER_FREE( sbiod->sbiod_pvt );
|
|
sbiod->sbiod_pvt = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tlso_sb_close( Sockbuf_IO_Desc *sbiod )
|
|
{
|
|
struct tls_data *p;
|
|
|
|
assert( sbiod != NULL );
|
|
assert( sbiod->sbiod_pvt != NULL );
|
|
|
|
p = (struct tls_data *)sbiod->sbiod_pvt;
|
|
SSL_shutdown( p->session );
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
|
|
{
|
|
struct tls_data *p;
|
|
|
|
assert( sbiod != NULL );
|
|
assert( sbiod->sbiod_pvt != NULL );
|
|
|
|
p = (struct tls_data *)sbiod->sbiod_pvt;
|
|
|
|
if ( opt == LBER_SB_OPT_GET_SSL ) {
|
|
*((tlso_session **)arg) = p->session;
|
|
return 1;
|
|
|
|
} else if ( opt == LBER_SB_OPT_DATA_READY ) {
|
|
if( SSL_pending( p->session ) > 0 ) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
|
|
}
|
|
|
|
static ber_slen_t
|
|
tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
|
|
{
|
|
struct tls_data *p;
|
|
ber_slen_t ret;
|
|
int err;
|
|
|
|
assert( sbiod != NULL );
|
|
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
|
|
|
|
p = (struct tls_data *)sbiod->sbiod_pvt;
|
|
|
|
ret = SSL_read( p->session, (char *)buf, len );
|
|
#ifdef HAVE_WINSOCK
|
|
errno = WSAGetLastError();
|
|
#endif
|
|
err = SSL_get_error( p->session, ret );
|
|
if (err == SSL_ERROR_WANT_READ ) {
|
|
sbiod->sbiod_sb->sb_trans_needs_read = 1;
|
|
sock_errset(EWOULDBLOCK);
|
|
}
|
|
else
|
|
sbiod->sbiod_sb->sb_trans_needs_read = 0;
|
|
return ret;
|
|
}
|
|
|
|
static ber_slen_t
|
|
tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
|
|
{
|
|
struct tls_data *p;
|
|
ber_slen_t ret;
|
|
int err;
|
|
|
|
assert( sbiod != NULL );
|
|
assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
|
|
|
|
p = (struct tls_data *)sbiod->sbiod_pvt;
|
|
|
|
ret = SSL_write( p->session, (char *)buf, len );
|
|
#ifdef HAVE_WINSOCK
|
|
errno = WSAGetLastError();
|
|
#endif
|
|
err = SSL_get_error( p->session, ret );
|
|
if (err == SSL_ERROR_WANT_WRITE ) {
|
|
sbiod->sbiod_sb->sb_trans_needs_write = 1;
|
|
sock_errset(EWOULDBLOCK);
|
|
|
|
} else {
|
|
sbiod->sbiod_sb->sb_trans_needs_write = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static Sockbuf_IO tlso_sbio =
|
|
{
|
|
tlso_sb_setup, /* sbi_setup */
|
|
tlso_sb_remove, /* sbi_remove */
|
|
tlso_sb_ctrl, /* sbi_ctrl */
|
|
tlso_sb_read, /* sbi_read */
|
|
tlso_sb_write, /* sbi_write */
|
|
tlso_sb_close /* sbi_close */
|
|
};
|
|
|
|
/* Derived from openssl/apps/s_cb.c */
|
|
static void
|
|
tlso_info_cb( const SSL *ssl, int where, int ret )
|
|
{
|
|
int w;
|
|
char *op;
|
|
char *state = (char *) SSL_state_string_long( (SSL *)ssl );
|
|
|
|
w = where & ~SSL_ST_MASK;
|
|
if ( w & SSL_ST_CONNECT ) {
|
|
op = "SSL_connect";
|
|
} else if ( w & SSL_ST_ACCEPT ) {
|
|
op = "SSL_accept";
|
|
} else {
|
|
op = "undefined";
|
|
}
|
|
|
|
#ifdef HAVE_EBCDIC
|
|
if ( state ) {
|
|
state = LDAP_STRDUP( state );
|
|
__etoa( state );
|
|
}
|
|
#endif
|
|
if ( where & SSL_CB_LOOP ) {
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:%s\n",
|
|
op, state, 0 );
|
|
|
|
} else if ( where & SSL_CB_ALERT ) {
|
|
char *atype = (char *) SSL_alert_type_string_long( ret );
|
|
char *adesc = (char *) SSL_alert_desc_string_long( ret );
|
|
op = ( where & SSL_CB_READ ) ? "read" : "write";
|
|
#ifdef HAVE_EBCDIC
|
|
if ( atype ) {
|
|
atype = LDAP_STRDUP( atype );
|
|
__etoa( atype );
|
|
}
|
|
if ( adesc ) {
|
|
adesc = LDAP_STRDUP( adesc );
|
|
__etoa( adesc );
|
|
}
|
|
#endif
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"TLS trace: SSL3 alert %s:%s:%s\n",
|
|
op, atype, adesc );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( atype ) LDAP_FREE( atype );
|
|
if ( adesc ) LDAP_FREE( adesc );
|
|
#endif
|
|
} else if ( where & SSL_CB_EXIT ) {
|
|
if ( ret == 0 ) {
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:failed in %s\n",
|
|
op, state, 0 );
|
|
} else if ( ret < 0 ) {
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:error in %s\n",
|
|
op, state, 0 );
|
|
}
|
|
}
|
|
#ifdef HAVE_EBCDIC
|
|
if ( state ) LDAP_FREE( state );
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
tlso_verify_cb( int ok, X509_STORE_CTX *ctx )
|
|
{
|
|
X509 *cert;
|
|
int errnum;
|
|
int errdepth;
|
|
X509_NAME *subject;
|
|
X509_NAME *issuer;
|
|
char *sname;
|
|
char *iname;
|
|
char *certerr = NULL;
|
|
|
|
cert = X509_STORE_CTX_get_current_cert( ctx );
|
|
errnum = X509_STORE_CTX_get_error( ctx );
|
|
errdepth = X509_STORE_CTX_get_error_depth( ctx );
|
|
|
|
/*
|
|
* X509_get_*_name return pointers to the internal copies of
|
|
* those things requested. So do not free them.
|
|
*/
|
|
subject = X509_get_subject_name( cert );
|
|
issuer = X509_get_issuer_name( cert );
|
|
/* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
|
|
sname = X509_NAME_oneline( subject, NULL, 0 );
|
|
iname = X509_NAME_oneline( issuer, NULL, 0 );
|
|
if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( sname ) __etoa( sname );
|
|
if ( iname ) __etoa( iname );
|
|
if ( certerr ) {
|
|
certerr = LDAP_STRDUP( certerr );
|
|
__etoa( certerr );
|
|
}
|
|
#endif
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"TLS certificate verification: depth: %d, err: %d, subject: %s,",
|
|
errdepth, errnum,
|
|
sname ? sname : "-unknown-" );
|
|
Debug( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 );
|
|
if ( !ok ) {
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"TLS certificate verification: Error, %s\n",
|
|
certerr, 0, 0 );
|
|
}
|
|
if ( sname )
|
|
CRYPTO_free ( sname );
|
|
if ( iname )
|
|
CRYPTO_free ( iname );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( certerr ) LDAP_FREE( certerr );
|
|
#endif
|
|
return ok;
|
|
}
|
|
|
|
static int
|
|
tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
|
|
{
|
|
(void) tlso_verify_cb( ok, ctx );
|
|
return 1;
|
|
}
|
|
|
|
/* Inspired by ERR_print_errors in OpenSSL */
|
|
static void
|
|
tlso_report_error( void )
|
|
{
|
|
unsigned long l;
|
|
char buf[200];
|
|
const char *file;
|
|
int line;
|
|
|
|
while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
|
|
ERR_error_string_n( l, buf, sizeof( buf ) );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( file ) {
|
|
file = LDAP_STRDUP( file );
|
|
__etoa( (char *)file );
|
|
}
|
|
__etoa( buf );
|
|
#endif
|
|
Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
|
|
buf, file, line );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( file ) LDAP_FREE( (void *)file );
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static RSA *
|
|
tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
|
|
{
|
|
RSA *tmp_rsa;
|
|
|
|
/* FIXME: Pregenerate the key on startup */
|
|
/* FIXME: Who frees the key? */
|
|
tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
|
|
|
|
if ( !tmp_rsa ) {
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"TLS: Failed to generate temporary %d-bit %s RSA key\n",
|
|
key_length, is_export ? "export" : "domestic", 0 );
|
|
return NULL;
|
|
}
|
|
return tmp_rsa;
|
|
}
|
|
|
|
static int
|
|
tlso_seed_PRNG( const char *randfile )
|
|
{
|
|
#ifndef URANDOM_DEVICE
|
|
/* no /dev/urandom (or equiv) */
|
|
long total=0;
|
|
char buffer[MAXPATHLEN];
|
|
|
|
if (randfile == NULL) {
|
|
/* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
|
|
* If $HOME is not set or buffer too small to hold the pathname,
|
|
* an error occurs. - From RAND_file_name() man page.
|
|
* The fact is that when $HOME is NULL, .rnd is used.
|
|
*/
|
|
randfile = RAND_file_name( buffer, sizeof( buffer ) );
|
|
|
|
} else if (RAND_egd(randfile) > 0) {
|
|
/* EGD socket */
|
|
return 0;
|
|
}
|
|
|
|
if (randfile == NULL) {
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
|
|
0, 0, 0);
|
|
return -1;
|
|
}
|
|
|
|
total = RAND_load_file(randfile, -1);
|
|
|
|
if (RAND_status() == 0) {
|
|
Debug( LDAP_DEBUG_ANY,
|
|
"TLS: PRNG not been seeded with enough data\n",
|
|
0, 0, 0);
|
|
return -1;
|
|
}
|
|
|
|
/* assume if there was enough bits to seed that it's okay
|
|
* to write derived bits to the file
|
|
*/
|
|
RAND_write_file(randfile);
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct dhinfo {
|
|
int keylength;
|
|
const char *pem;
|
|
size_t size;
|
|
};
|
|
|
|
|
|
/* From the OpenSSL 0.9.7 distro */
|
|
static const char tlso_dhpem512[] =
|
|
"-----BEGIN DH PARAMETERS-----\n\
|
|
MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\
|
|
a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\
|
|
-----END DH PARAMETERS-----\n";
|
|
|
|
static const char tlso_dhpem1024[] =
|
|
"-----BEGIN DH PARAMETERS-----\n\
|
|
MIGHAoGBAJf2QmHKtQXdKCjhPx1ottPb0PMTBH9A6FbaWMsTuKG/K3g6TG1Z1fkq\n\
|
|
/Gz/PWk/eLI9TzFgqVAuPvr3q14a1aZeVUMTgo2oO5/y2UHe6VaJ+trqCTat3xlx\n\
|
|
/mNbIK9HA2RgPC3gWfVLZQrY+gz3ASHHR5nXWHEyvpuZm7m3h+irAgEC\n\
|
|
-----END DH PARAMETERS-----\n";
|
|
|
|
static const char tlso_dhpem2048[] =
|
|
"-----BEGIN DH PARAMETERS-----\n\
|
|
MIIBCAKCAQEA7ZKJNYJFVcs7+6J2WmkEYb8h86tT0s0h2v94GRFS8Q7B4lW9aG9o\n\
|
|
AFO5Imov5Jo0H2XMWTKKvbHbSe3fpxJmw/0hBHAY8H/W91hRGXKCeyKpNBgdL8sh\n\
|
|
z22SrkO2qCnHJ6PLAMXy5fsKpFmFor2tRfCzrfnggTXu2YOzzK7q62bmqVdmufEo\n\
|
|
pT8igNcLpvZxk5uBDvhakObMym9mX3rAEBoe8PwttggMYiiw7NuJKO4MqD1llGkW\n\
|
|
aVM8U2ATsCun1IKHrRxynkE1/MJ86VHeYYX8GZt2YA8z+GuzylIOKcMH6JAWzMwA\n\
|
|
Gbatw6QwizOhr9iMjZ0B26TE3X8LvW84wwIBAg==\n\
|
|
-----END DH PARAMETERS-----\n";
|
|
|
|
static const char tlso_dhpem4096[] =
|
|
"-----BEGIN DH PARAMETERS-----\n\
|
|
MIICCAKCAgEA/urRnb6vkPYc/KEGXWnbCIOaKitq7ySIq9dTH7s+Ri59zs77zty7\n\
|
|
vfVlSe6VFTBWgYjD2XKUFmtqq6CqXMhVX5ElUDoYDpAyTH85xqNFLzFC7nKrff/H\n\
|
|
TFKNttp22cZE9V0IPpzedPfnQkE7aUdmF9JnDyv21Z/818O93u1B4r0szdnmEvEF\n\
|
|
bKuIxEHX+bp0ZR7RqE1AeifXGJX3d6tsd2PMAObxwwsv55RGkn50vHO4QxtTARr1\n\
|
|
rRUV5j3B3oPMgC7Offxx+98Xn45B1/G0Prp11anDsR1PGwtaCYipqsvMwQUSJtyE\n\
|
|
EOQWk+yFkeMe4vWv367eEi0Sd/wnC+TSXBE3pYvpYerJ8n1MceI5GQTdarJ77OW9\n\
|
|
bGTHmxRsLSCM1jpLdPja5jjb4siAa6EHc4qN9c/iFKS3PQPJEnX7pXKBRs5f7AF3\n\
|
|
W3RIGt+G9IVNZfXaS7Z/iCpgzgvKCs0VeqN38QsJGtC1aIkwOeyjPNy2G6jJ4yqH\n\
|
|
ovXYt/0mc00vCWeSNS1wren0pR2EiLxX0ypjjgsU1mk/Z3b/+zVf7fZSIB+nDLjb\n\
|
|
NPtUlJCVGnAeBK1J1nG3TQicqowOXoM6ISkdaXj5GPJdXHab2+S7cqhKGv5qC7rR\n\
|
|
jT6sx7RUr0CNTxzLI7muV2/a4tGmj0PSdXQdsZ7tw7gbXlaWT1+MM2MCAQI=\n\
|
|
-----END DH PARAMETERS-----\n";
|
|
|
|
static const struct dhinfo tlso_dhpem[] = {
|
|
{ 512, tlso_dhpem512, sizeof(tlso_dhpem512) },
|
|
{ 1024, tlso_dhpem1024, sizeof(tlso_dhpem1024) },
|
|
{ 2048, tlso_dhpem2048, sizeof(tlso_dhpem2048) },
|
|
{ 4096, tlso_dhpem4096, sizeof(tlso_dhpem4096) },
|
|
{ 0, NULL, 0 }
|
|
};
|
|
|
|
static DH *
|
|
tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
|
|
{
|
|
struct dhplist *p = NULL;
|
|
BIO *b = NULL;
|
|
DH *dh = NULL;
|
|
int i;
|
|
|
|
/* Do we have params of this length already? */
|
|
#ifdef LDAP_R_COMPILE
|
|
ldap_pvt_thread_mutex_lock( &tlso_dh_mutex );
|
|
#endif
|
|
for ( p = tlso_dhparams; p; p=p->next ) {
|
|
if ( p->keylength == key_length ) {
|
|
#ifdef LDAP_R_COMPILE
|
|
ldap_pvt_thread_mutex_unlock( &tlso_dh_mutex );
|
|
#endif
|
|
return p->param;
|
|
}
|
|
}
|
|
|
|
/* No - check for hardcoded params */
|
|
|
|
for (i=0; tlso_dhpem[i].keylength; i++) {
|
|
if ( tlso_dhpem[i].keylength == key_length ) {
|
|
b = BIO_new_mem_buf( (char *)tlso_dhpem[i].pem, tlso_dhpem[i].size );
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( b ) {
|
|
dh = PEM_read_bio_DHparams( b, NULL, NULL, NULL );
|
|
BIO_free( b );
|
|
}
|
|
|
|
/* Generating on the fly is expensive/slow... */
|
|
if ( !dh ) {
|
|
dh = DH_generate_parameters( key_length, DH_GENERATOR_2, NULL, NULL );
|
|
}
|
|
if ( dh ) {
|
|
p = LDAP_MALLOC( sizeof(struct dhplist) );
|
|
if ( p != NULL ) {
|
|
p->keylength = key_length;
|
|
p->param = dh;
|
|
p->next = tlso_dhparams;
|
|
tlso_dhparams = p;
|
|
}
|
|
}
|
|
|
|
#ifdef LDAP_R_COMPILE
|
|
ldap_pvt_thread_mutex_unlock( &tlso_dh_mutex );
|
|
#endif
|
|
return dh;
|
|
}
|
|
|
|
tls_impl ldap_int_tls_impl = {
|
|
"OpenSSL",
|
|
|
|
tlso_init,
|
|
tlso_destroy,
|
|
|
|
tlso_ctx_new,
|
|
tlso_ctx_ref,
|
|
tlso_ctx_free,
|
|
tlso_ctx_init,
|
|
|
|
tlso_session_new,
|
|
tlso_session_connect,
|
|
tlso_session_accept,
|
|
tlso_session_upflags,
|
|
tlso_session_errmsg,
|
|
tlso_session_my_dn,
|
|
tlso_session_peer_dn,
|
|
tlso_session_chkhost,
|
|
tlso_session_strength,
|
|
|
|
&tlso_sbio,
|
|
|
|
#ifdef LDAP_R_COMPILE
|
|
tlso_thr_init,
|
|
#else
|
|
NULL,
|
|
#endif
|
|
|
|
0
|
|
};
|
|
|
|
#endif /* HAVE_OPENSSL */
|