mirror of
https://git.openldap.org/openldap/openldap.git
synced 2025-12-22 23:59:34 -05:00
a5953812f0
This will only have any effect if libldap is the first caller to initialize OpenSSL, but that should be all that matters when libldap is part of a dynmically loaded module. It prevents the crash in the example cases given.
1738 lines
40 KiB
C
1738 lines
40 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 2008-2022 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 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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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/dh.h>
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#endif
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#if OPENSSL_VERSION_NUMBER >= 0x10100000
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#define ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
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#endif
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#if OPENSSL_VERSION_MAJOR >= 3
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#define ERR_get_error_line( a, b ) ERR_get_error_all( a, b, NULL, NULL, NULL )
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#define SSL_get_peer_certificate( s ) SSL_get1_peer_certificate( s )
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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 BIO_METHOD * tlso_bio_method = NULL;
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static BIO_METHOD * tlso_bio_setup( void );
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static int tlso_opt_trace = 1;
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static void tlso_report_error( char *errmsg );
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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 int tlso_seed_PRNG( const char *randfile );
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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/*
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* OpenSSL 1.1 API and later has new locking code
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*/
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static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
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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 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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#if OPENSSL_VERSION_NUMBER >= 0x0909000
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static void tlso_thread_self( CRYPTO_THREADID *id )
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{
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CRYPTO_THREADID_set_pointer( id, (void *)ldap_pvt_thread_self() );
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}
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#define CRYPTO_set_id_callback(foo) CRYPTO_THREADID_set_callback(foo)
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#else
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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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#endif
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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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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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#else
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#ifdef LDAP_R_COMPILE
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static void tlso_thr_init( void ) {}
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#endif
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#endif /* OpenSSL 1.1 */
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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/*
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* OpenSSL 1.1 API and later makes the BIO method concrete types internal.
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*/
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static BIO_METHOD *
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BIO_meth_new( int type, const char *name )
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{
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BIO_METHOD *method = LDAP_MALLOC( sizeof(BIO_METHOD) );
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memset( method, 0, sizeof(BIO_METHOD) );
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method->type = type;
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method->name = name;
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return method;
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}
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static void
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BIO_meth_free( BIO_METHOD *meth )
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{
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if ( meth == NULL ) {
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return;
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}
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LDAP_FREE( meth );
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}
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#define BIO_meth_set_write(m, f) (m)->bwrite = (f)
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#define BIO_meth_set_read(m, f) (m)->bread = (f)
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#define BIO_meth_set_puts(m, f) (m)->bputs = (f)
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#define BIO_meth_set_gets(m, f) (m)->bgets = (f)
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#define BIO_meth_set_ctrl(m, f) (m)->ctrl = (f)
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#define BIO_meth_set_create(m, f) (m)->create = (f)
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#define BIO_meth_set_destroy(m, f) (m)->destroy = (f)
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#endif /* OpenSSL 1.1 */
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static STACK_OF(X509_NAME) *
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tlso_ca_list( char * bundle, char * dir, X509 *cert )
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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 ( dir ) {
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char **dirs = ldap_str2charray( dir, CERTPATHSEP );
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int freeit = 0, i, success = 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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for ( i=0; dirs[i]; i++ ) {
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success += SSL_add_dir_cert_subjects_to_stack( ca_list, dir );
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}
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if ( !success && 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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ldap_charray_free( dirs );
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}
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if ( cert ) {
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X509_NAME *xn = X509_get_subject_name( cert );
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xn = X509_NAME_dup( xn );
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if ( !ca_list )
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ca_list = sk_X509_NAME_new_null();
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if ( xn && ca_list )
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sk_X509_NAME_push( ca_list, xn );
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}
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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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#if OPENSSL_VERSION_NUMBER < 0x10100000
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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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#else
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OPENSSL_init_ssl(OPENSSL_INIT_NO_ATEXIT, NULL);
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#endif
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/* FIXME: mod_ssl does this */
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X509V3_add_standard_extensions();
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tlso_bio_method = tlso_bio_setup();
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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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BIO_meth_free( tlso_bio_method );
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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EVP_cleanup();
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ERR_remove_thread_state(NULL);
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ERR_free_strings();
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#endif
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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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#if OPENSSL_VERSION_NUMBER < 0x10100000
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#define SSL_CTX_up_ref(ctx) CRYPTO_add( &(ctx->references), 1, CRYPTO_LOCK_SSL_CTX )
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#endif
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SSL_CTX_up_ref( c );
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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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#if OPENSSL_VERSION_NUMBER >= 0x10101000
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static char *
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tlso_stecpy( char *dst, const char *src, const char *end )
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{
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while ( dst < end && *src )
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*dst++ = *src++;
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if ( dst < end )
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*dst = '\0';
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return dst;
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}
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/* OpenSSL 1.1.1 uses a separate API for TLS1.3 ciphersuites.
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* Try to find any TLS1.3 ciphers in the given list of suites.
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*/
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static void
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tlso_ctx_cipher13( tlso_ctx *ctx, char *suites, char **oldsuites )
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{
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char tls13_suites[1024], *ts = tls13_suites, *te = tls13_suites + sizeof(tls13_suites);
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char *ptr, *colon, *nptr;
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char sname[128];
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STACK_OF(SSL_CIPHER) *cs;
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SSL *s = SSL_new( ctx );
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int ret;
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*oldsuites = NULL;
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if ( !s )
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return;
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*ts = '\0';
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/* check individual suites in a separate SSL handle before
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* mucking with the provided ctx. Init it to a known
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* mostly-empty state.
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*/
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SSL_set_ciphersuites( s, "" );
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SSL_set_cipher_list( s, SSL3_TXT_RSA_NULL_SHA );
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for ( ptr = suites;; ) {
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colon = strchr( ptr, ':' );
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if ( colon ) {
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int len = colon - ptr;
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if ( len > 63 ) len = 63;
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strncpy( sname, ptr, len );
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sname[len] = '\0';
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nptr = sname;
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} else {
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nptr = ptr;
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}
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if ( SSL_set_ciphersuites( s, nptr )) {
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cs = SSL_get_ciphers( s );
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if ( cs ) {
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const char *ver = SSL_CIPHER_get_version( sk_SSL_CIPHER_value( cs, 0 ));
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if ( !strncmp( ver, "TLSv", 4 ) && strncmp( ver+4, "1.3", 3 ) >= 0 ) {
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if ( tls13_suites[0] )
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ts = tlso_stecpy( ts, ":", te );
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ts = tlso_stecpy( ts, nptr, te );
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} else if (! *oldsuites) {
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/* should never happen, set_ciphersuites should
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* only succeed for TLSv1.3 and above
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*/
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*oldsuites = ptr;
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}
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}
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} else if (! *oldsuites) {
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*oldsuites = ptr;
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}
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if ( !colon || ts >= te )
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break;
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ptr = colon+1;
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}
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SSL_free( s );
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/* If no TLS1.3 ciphersuites were specified, leave current settings untouched. */
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if ( tls13_suites[0] )
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SSL_CTX_set_ciphersuites( ctx, tls13_suites );
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}
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#endif /* OpenSSL 1.1.1 */
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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, char *errmsg )
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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 ) {
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int opt = 0;
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 ) {
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opt |= SSL_OP_NO_SSLv2;
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SSL_CTX_clear_options( ctx, SSL_OP_NO_SSLv3 );
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}
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
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opt |= SSL_OP_NO_SSLv3;
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#ifdef SSL_OP_NO_TLSv1
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
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opt |= SSL_OP_NO_TLSv1;
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#endif
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#ifdef SSL_OP_NO_TLSv1_1
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
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opt |= SSL_OP_NO_TLSv1_1;
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#endif
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#ifdef SSL_OP_NO_TLSv1_2
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
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opt |= SSL_OP_NO_TLSv1_2;
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#endif
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#ifdef SSL_OP_NO_TLSv1_3
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if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
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opt |= SSL_OP_NO_TLSv1_3;
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#endif
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if ( opt )
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SSL_CTX_set_options( ctx, opt );
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}
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if ( lo->ldo_tls_protocol_max ) {
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int opt = 0;
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#ifdef SSL_OP_NO_TLSv1_3
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if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
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opt |= SSL_OP_NO_TLSv1_3;
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#endif
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#ifdef SSL_OP_NO_TLSv1_2
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if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
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opt |= SSL_OP_NO_TLSv1_2;
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#endif
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#ifdef SSL_OP_NO_TLSv1_1
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if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
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opt |= SSL_OP_NO_TLSv1_1;
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#endif
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#ifdef SSL_OP_NO_TLSv1
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if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
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opt |= SSL_OP_NO_TLSv1;
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#endif
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if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
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opt |= SSL_OP_NO_SSLv3;
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if ( opt )
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SSL_CTX_set_options( ctx, opt );
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}
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if ( lo->ldo_tls_ciphersuite ) {
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char *oldsuites = lt->lt_ciphersuite;
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#if OPENSSL_VERSION_NUMBER >= 0x10101000
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tlso_ctx_cipher13( ctx, lt->lt_ciphersuite, &oldsuites );
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#endif
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if ( oldsuites && !SSL_CTX_set_cipher_list( ctx, oldsuites ) )
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{
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Debug1( LDAP_DEBUG_ANY,
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"TLS: could not set cipher list %s.\n",
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lo->ldo_tls_ciphersuite );
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tlso_report_error( errmsg );
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return -1;
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}
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}
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if ( lo->ldo_tls_cacertfile == NULL && lo->ldo_tls_cacertdir == NULL &&
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lo->ldo_tls_cacert.bv_val == NULL ) {
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if ( !SSL_CTX_set_default_verify_paths( ctx ) ) {
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Debug0( LDAP_DEBUG_ANY, "TLS: "
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"could not use default certificate paths" );
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tlso_report_error( errmsg );
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return -1;
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}
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} else {
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X509 *cert = NULL;
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if ( lo->ldo_tls_cacert.bv_val ) {
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const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cacert.bv_val);
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cert = d2i_X509( NULL, &pp, lo->ldo_tls_cacert.bv_len );
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X509_STORE *store = SSL_CTX_get_cert_store( ctx );
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if ( !X509_STORE_add_cert( store, cert )) {
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Debug0( LDAP_DEBUG_ANY, "TLS: "
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"could not use CA certificate" );
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tlso_report_error( errmsg );
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return -1;
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}
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}
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if ( lt->lt_cacertfile || lt->lt_cacertdir ) {
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char **dirs, *dummy = NULL;
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if ( lt->lt_cacertdir ) {
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dirs = ldap_str2charray( lt->lt_cacertdir, CERTPATHSEP );
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} else {
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dirs = &dummy;
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}
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/* Start with the first dir in path */
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if ( !SSL_CTX_load_verify_locations( ctx,
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lt->lt_cacertfile, dirs[0] ) )
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|
{
|
|
Debug2( LDAP_DEBUG_ANY, "TLS: "
|
|
"could not load verify locations (file:`%s',dir:`%s').\n",
|
|
lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
|
|
dirs[0] ? dirs[0] : "" );
|
|
tlso_report_error( errmsg );
|
|
if ( dirs != &dummy )
|
|
ldap_charray_free( dirs );
|
|
return -1;
|
|
}
|
|
/* Then additional dirs, if any */
|
|
if ( dirs != &dummy ) {
|
|
if ( dirs[1] ) {
|
|
int i;
|
|
X509_STORE *store = SSL_CTX_get_cert_store( ctx );
|
|
X509_LOOKUP *lookup = X509_STORE_add_lookup( store, X509_LOOKUP_hash_dir() );
|
|
for ( i=1; dirs[i]; i++ )
|
|
X509_LOOKUP_add_dir( lookup, dirs[i], X509_FILETYPE_PEM );
|
|
}
|
|
ldap_charray_free( dirs );
|
|
}
|
|
}
|
|
|
|
if ( is_server ) {
|
|
STACK_OF(X509_NAME) *calist;
|
|
/* List of CA names to send to a client */
|
|
calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir, cert );
|
|
if ( !calist ) {
|
|
Debug2( LDAP_DEBUG_ANY, "TLS: "
|
|
"could not load client CA list (file:`%s',dir:`%s').\n",
|
|
lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
|
|
lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
|
|
SSL_CTX_set_client_CA_list( ctx, calist );
|
|
}
|
|
if ( cert )
|
|
X509_free( cert );
|
|
}
|
|
|
|
if ( lo->ldo_tls_cert.bv_val )
|
|
{
|
|
const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cert.bv_val);
|
|
X509 *cert = d2i_X509( NULL, &pp, lo->ldo_tls_cert.bv_len );
|
|
if ( !SSL_CTX_use_certificate( ctx, cert )) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: could not use certificate.\n" );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
X509_free( cert );
|
|
} else
|
|
if ( lo->ldo_tls_certfile &&
|
|
!SSL_CTX_use_certificate_chain_file( ctx, lt->lt_certfile) )
|
|
{
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS: could not use certificate file `%s'.\n",
|
|
lo->ldo_tls_certfile );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
|
|
/* Key validity is checked automatically if cert has already been set */
|
|
if ( lo->ldo_tls_key.bv_val )
|
|
{
|
|
const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_key.bv_val);
|
|
EVP_PKEY *pkey = d2i_AutoPrivateKey( NULL, &pp, lo->ldo_tls_key.bv_len );
|
|
if ( !SSL_CTX_use_PrivateKey( ctx, pkey ))
|
|
{
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: could not use private key.\n" );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
EVP_PKEY_free( pkey );
|
|
} else
|
|
if ( lo->ldo_tls_keyfile &&
|
|
!SSL_CTX_use_PrivateKey_file( ctx,
|
|
lt->lt_keyfile, SSL_FILETYPE_PEM ) )
|
|
{
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS: could not use key file `%s'.\n",
|
|
lo->ldo_tls_keyfile );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
|
|
if ( is_server && lo->ldo_tls_dhfile ) {
|
|
#if OPENSSL_VERSION_MAJOR >= 3
|
|
EVP_PKEY *dh;
|
|
#define bio_params( bio, dh ) dh = PEM_read_bio_Parameters( bio, NULL )
|
|
#else
|
|
DH *dh;
|
|
#define bio_params( bio, dh ) dh = PEM_read_bio_DHparams( bio, NULL, NULL, NULL )
|
|
#endif
|
|
BIO *bio;
|
|
|
|
if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS: could not use DH parameters file `%s'.\n",
|
|
lo->ldo_tls_dhfile );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
if (!( bio_params( bio, dh ))) {
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS: could not read DH parameters file `%s'.\n",
|
|
lo->ldo_tls_dhfile );
|
|
tlso_report_error( errmsg );
|
|
BIO_free( bio );
|
|
return -1;
|
|
}
|
|
BIO_free( bio );
|
|
#if OPENSSL_VERSION_MAJOR >= 3
|
|
SSL_CTX_set0_tmp_dh_pkey( ctx, dh );
|
|
#else
|
|
SSL_CTX_set_tmp_dh( ctx, dh );
|
|
SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE );
|
|
DH_free( dh );
|
|
#endif
|
|
}
|
|
|
|
if ( lo->ldo_tls_ecname ) {
|
|
#ifdef OPENSSL_NO_EC
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: Elliptic Curves not supported.\n" );
|
|
return -1;
|
|
#else
|
|
if ( !SSL_CTX_set1_curves_list( ctx, lt->lt_ecname )) {
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS: could not set EC name `%s'.\n",
|
|
lo->ldo_tls_ecname );
|
|
tlso_report_error( errmsg );
|
|
return -1;
|
|
}
|
|
/*
|
|
* This is a NOP in OpenSSL 1.1.0 and later, where curves are always
|
|
* auto-negotiated.
|
|
*/
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000UL
|
|
if ( SSL_CTX_set_ecdh_auto( ctx, 1 ) <= 0 ) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: could not enable automatic EC negotiation.\n" );
|
|
}
|
|
#endif
|
|
#endif /* OPENSSL_NO_EC */
|
|
}
|
|
|
|
if ( tlso_opt_trace ) {
|
|
SSL_CTX_set_info_callback( ctx, tlso_info_cb );
|
|
}
|
|
|
|
i = SSL_VERIFY_NONE;
|
|
if ( lo->ldo_tls_require_cert ) {
|
|
i = SSL_VERIFY_PEER;
|
|
if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
|
|
lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
|
|
i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
|
|
}
|
|
}
|
|
|
|
SSL_CTX_set_verify( ctx, i,
|
|
lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
|
|
tlso_verify_ok : tlso_verify_cb );
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000
|
|
SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
|
|
#endif
|
|
if ( lo->ldo_tls_crlcheck ) {
|
|
X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
|
|
if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
|
|
X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
|
|
} else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
|
|
X509_STORE_set_flags( x509_s,
|
|
X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
|
|
}
|
|
}
|
|
/* Explicitly honor the server side cipher suite preference */
|
|
SSL_CTX_set_options( ctx, SSL_OP_CIPHER_SERVER_PREFERENCE );
|
|
return 0;
|
|
}
|
|
|
|
static tls_session *
|
|
tlso_session_new( tls_ctx *ctx, int is_server )
|
|
{
|
|
tlso_ctx *c = (tlso_ctx *)ctx;
|
|
return (tls_session *)SSL_new( c );
|
|
}
|
|
|
|
static int
|
|
tlso_session_connect( LDAP *ld, tls_session *sess, const char *name_in )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
int rc;
|
|
|
|
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
|
|
if ( name_in ) {
|
|
rc = SSL_set_tlsext_host_name( s, name_in );
|
|
if ( !rc ) /* can fail to strdup the name */
|
|
return -1;
|
|
}
|
|
#endif
|
|
/* Caller expects 0 = success, OpenSSL returns 1 = success */
|
|
rc = SSL_connect( s ) - 1;
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
tlso_session_accept( tls_session *sess )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
|
|
/* Caller expects 0 = success, OpenSSL returns 1 = success */
|
|
return SSL_accept( s ) - 1;
|
|
}
|
|
|
|
static int
|
|
tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
|
|
/* 1 was subtracted above, offset it back now */
|
|
rc = SSL_get_error(s, rc+1);
|
|
if (rc == SSL_ERROR_WANT_READ) {
|
|
sb->sb_trans_needs_read = 1;
|
|
return 1;
|
|
|
|
} else if (rc == SSL_ERROR_WANT_WRITE) {
|
|
sb->sb_trans_needs_write = 1;
|
|
return 1;
|
|
|
|
} else if (rc == SSL_ERROR_WANT_CONNECT) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static char *
|
|
tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
|
|
{
|
|
char err[256] = "";
|
|
const char *certerr=NULL;
|
|
tlso_session *s = (tlso_session *)sess;
|
|
|
|
rc = ERR_peek_error();
|
|
if ( rc ) {
|
|
ERR_error_string_n( rc, err, sizeof(err) );
|
|
if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) &&
|
|
( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
|
|
int certrc = SSL_get_verify_result(s);
|
|
certerr = (char *)X509_verify_cert_error_string(certrc);
|
|
}
|
|
snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"",
|
|
certerr ? certerr : "", certerr ? ")" : "" );
|
|
return buf;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
X509 *x;
|
|
X509_NAME *xn;
|
|
|
|
x = SSL_get_certificate( s );
|
|
|
|
if (!x) return LDAP_INVALID_CREDENTIALS;
|
|
|
|
xn = X509_get_subject_name(x);
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000
|
|
der_dn->bv_len = i2d_X509_NAME( xn, NULL );
|
|
der_dn->bv_val = xn->bytes->data;
|
|
#else
|
|
{
|
|
size_t len = 0;
|
|
der_dn->bv_val = NULL;
|
|
X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
|
|
der_dn->bv_len = len;
|
|
}
|
|
#endif
|
|
/* Don't X509_free, the session is still using it */
|
|
return 0;
|
|
}
|
|
|
|
static X509 *
|
|
tlso_get_cert( SSL *s )
|
|
{
|
|
/* If peer cert was bad, treat as if no cert was given */
|
|
if (SSL_get_verify_result(s)) {
|
|
return NULL;
|
|
}
|
|
return SSL_get_peer_certificate(s);
|
|
}
|
|
|
|
static int
|
|
tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
X509 *x = tlso_get_cert( s );
|
|
X509_NAME *xn;
|
|
|
|
if ( !x )
|
|
return LDAP_INVALID_CREDENTIALS;
|
|
|
|
xn = X509_get_subject_name(x);
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000
|
|
der_dn->bv_len = i2d_X509_NAME( xn, NULL );
|
|
der_dn->bv_val = xn->bytes->data;
|
|
#else
|
|
{
|
|
size_t len = 0;
|
|
der_dn->bv_val = NULL;
|
|
X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
|
|
der_dn->bv_len = len;
|
|
}
|
|
#endif
|
|
X509_free(x);
|
|
return 0;
|
|
}
|
|
|
|
/* what kind of hostname were we given? */
|
|
#define IS_DNS 0
|
|
#define IS_IP4 1
|
|
#define IS_IP6 2
|
|
|
|
static int
|
|
tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
int i, ret = LDAP_LOCAL_ERROR;
|
|
int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
|
|
X509 *x;
|
|
const char *name;
|
|
char *ptr;
|
|
int ntype = IS_DNS, nlen;
|
|
#ifdef LDAP_PF_INET6
|
|
struct in6_addr addr;
|
|
#else
|
|
struct in_addr addr;
|
|
#endif
|
|
|
|
if( ldap_int_hostname &&
|
|
( !name_in || !strcasecmp( name_in, "localhost" ) ) )
|
|
{
|
|
name = ldap_int_hostname;
|
|
} else {
|
|
name = name_in;
|
|
}
|
|
nlen = strlen(name);
|
|
|
|
x = tlso_get_cert(s);
|
|
if (!x) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: unable to get peer certificate.\n" );
|
|
/* If this was a fatal condition, things would have
|
|
* aborted long before now.
|
|
*/
|
|
return LDAP_SUCCESS;
|
|
}
|
|
|
|
#ifdef LDAP_PF_INET6
|
|
if (inet_pton(AF_INET6, name, &addr)) {
|
|
ntype = IS_IP6;
|
|
} else
|
|
#endif
|
|
if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
|
|
if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
|
|
}
|
|
|
|
if (chkSAN) {
|
|
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, len2 = 0;
|
|
char *domain = NULL;
|
|
GENERAL_NAME *gn;
|
|
|
|
gotSAN = 1;
|
|
if (ntype == IS_DNS) {
|
|
domain = strchr(name, '.');
|
|
if (domain) {
|
|
len2 = nlen - (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 ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
|
|
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 && chkSAN) {
|
|
switch(chkSAN) {
|
|
case LDAP_OPT_X_TLS_DEMAND:
|
|
case LDAP_OPT_X_TLS_HARD:
|
|
if (!gotSAN) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: unable to get subjectAltName from peer certificate.\n" );
|
|
ret = LDAP_CONNECT_ERROR;
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: unable to get subjectAltName from peer certificate"));
|
|
goto done;
|
|
}
|
|
/* FALLTHRU */
|
|
case LDAP_OPT_X_TLS_TRY:
|
|
if (gotSAN) {
|
|
Debug1( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
|
|
"subjectAltName in certificate.\n",
|
|
name );
|
|
ret = LDAP_CONNECT_ERROR;
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: hostname does not match subjectAltName in peer certificate"));
|
|
goto done;
|
|
}
|
|
break;
|
|
case LDAP_OPT_X_TLS_ALLOW:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret != LDAP_SUCCESS) {
|
|
X509_NAME *xn;
|
|
X509_NAME_ENTRY *ne;
|
|
ASN1_OBJECT *obj;
|
|
ASN1_STRING *cn = NULL;
|
|
int navas;
|
|
|
|
/* find the last CN */
|
|
obj = OBJ_nid2obj( NID_commonName );
|
|
if ( !obj ) goto no_cn; /* should never happen */
|
|
|
|
xn = X509_get_subject_name(x);
|
|
navas = X509_NAME_entry_count( xn );
|
|
for ( i=navas-1; i>=0; i-- ) {
|
|
ne = X509_NAME_get_entry( xn, i );
|
|
if ( !OBJ_cmp( X509_NAME_ENTRY_get_object(ne), obj )) {
|
|
cn = X509_NAME_ENTRY_get_data( ne );
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( !cn )
|
|
{
|
|
no_cn:
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: unable to get common name from peer certificate.\n" );
|
|
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 ( cn->length == nlen &&
|
|
strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
|
|
ret = LDAP_SUCCESS;
|
|
|
|
} else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
|
|
char *domain = strchr(name, '.');
|
|
if( domain ) {
|
|
int dlen;
|
|
|
|
dlen = nlen - (domain-name);
|
|
|
|
/* Is this a wildcard match? */
|
|
if ((dlen == cn->length-1) &&
|
|
!strncasecmp(domain, (char *) &cn->data[1], dlen)) {
|
|
ret = LDAP_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( ret == LDAP_LOCAL_ERROR ) {
|
|
Debug3( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
|
|
"common name in certificate (%.*s).\n",
|
|
name, cn->length, cn->data );
|
|
ret = LDAP_CONNECT_ERROR;
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: hostname does not match name in peer certificate"));
|
|
}
|
|
}
|
|
done:
|
|
X509_free(x);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tlso_session_strength( tls_session *sess )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
|
|
return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
|
|
}
|
|
|
|
static int
|
|
tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
|
|
/* Usually the client sends the finished msg. But if the
|
|
* session was resumed, the server sent the msg.
|
|
*/
|
|
if (SSL_session_reused(s) ^ !is_server)
|
|
buf->bv_len = SSL_get_finished(s, buf->bv_val, buf->bv_len);
|
|
else
|
|
buf->bv_len = SSL_get_peer_finished(s, buf->bv_val, buf->bv_len);
|
|
return buf->bv_len;
|
|
}
|
|
|
|
static int
|
|
tlso_session_endpoint( tls_session *sess, struct berval *buf, int is_server )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
const EVP_MD *md;
|
|
unsigned int md_len;
|
|
X509 *cert;
|
|
|
|
if ( buf->bv_len < EVP_MAX_MD_SIZE )
|
|
return 0;
|
|
|
|
if ( is_server )
|
|
cert = SSL_get_certificate( s );
|
|
else
|
|
cert = SSL_get_peer_certificate( s );
|
|
|
|
if ( cert == NULL )
|
|
return 0;
|
|
|
|
#if OPENSSL_VERSION_NUMBER >= 0x10100000
|
|
md = EVP_get_digestbynid( X509_get_signature_nid( cert ));
|
|
#else
|
|
md = EVP_get_digestbynid(OBJ_obj2nid( cert->sig_alg->algorithm ));
|
|
#endif
|
|
|
|
/* See RFC 5929 */
|
|
if ( md == NULL ||
|
|
md == EVP_md_null() ||
|
|
#ifndef OPENSSL_NO_MD2
|
|
md == EVP_md2() ||
|
|
#endif
|
|
#ifndef OPENSSL_NO_MD4
|
|
md == EVP_md4() ||
|
|
#endif
|
|
#ifndef OPENSSL_NO_MD5
|
|
md == EVP_md5() ||
|
|
#endif
|
|
md == EVP_sha1() )
|
|
md = EVP_sha256();
|
|
|
|
if ( !X509_digest( cert, md, (unsigned char *) (buf->bv_val), &md_len ))
|
|
md_len = 0;
|
|
|
|
buf->bv_len = md_len;
|
|
if ( !is_server )
|
|
X509_free( cert );
|
|
|
|
return md_len;
|
|
}
|
|
|
|
static const char *
|
|
tlso_session_version( tls_session *sess )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
return SSL_get_version(s);
|
|
}
|
|
|
|
static const char *
|
|
tlso_session_cipher( tls_session *sess )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
return SSL_CIPHER_get_name(SSL_get_current_cipher(s));
|
|
}
|
|
|
|
static int
|
|
tlso_session_peercert( tls_session *sess, struct berval *der )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
int ret = -1;
|
|
X509 *x = SSL_get_peer_certificate(s);
|
|
if ( x ) {
|
|
der->bv_len = i2d_X509(x, NULL);
|
|
der->bv_val = LDAP_MALLOC(der->bv_len);
|
|
if ( der->bv_val ) {
|
|
unsigned char *ptr = (unsigned char *) (der->bv_val);
|
|
i2d_X509(x, &ptr);
|
|
ret = 0;
|
|
}
|
|
X509_free( x );
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tlso_session_pinning( LDAP *ld, tls_session *sess, char *hashalg, struct berval *hash )
|
|
{
|
|
tlso_session *s = (tlso_session *)sess;
|
|
unsigned char *tmp, digest[EVP_MAX_MD_SIZE];
|
|
struct berval key,
|
|
keyhash = { sizeof(digest), (char *) digest };
|
|
X509 *cert = SSL_get_peer_certificate(s);
|
|
int len, rc = LDAP_SUCCESS;
|
|
|
|
if ( !cert )
|
|
return -1;
|
|
|
|
len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), NULL );
|
|
|
|
tmp = LDAP_MALLOC( len );
|
|
key.bv_val = (char *) tmp;
|
|
|
|
if ( !key.bv_val ) {
|
|
rc = -1;
|
|
goto done;
|
|
}
|
|
|
|
key.bv_len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), &tmp );
|
|
|
|
if ( hashalg ) {
|
|
const EVP_MD *md;
|
|
EVP_MD_CTX *mdctx;
|
|
unsigned int len = keyhash.bv_len;
|
|
|
|
md = EVP_get_digestbyname( hashalg );
|
|
if ( !md ) {
|
|
Debug1( LDAP_DEBUG_TRACE, "tlso_session_pinning: "
|
|
"hash %s not recognised by OpenSSL\n", hashalg );
|
|
rc = -1;
|
|
goto done;
|
|
}
|
|
|
|
#if OPENSSL_VERSION_NUMBER >= 0x10100000
|
|
mdctx = EVP_MD_CTX_new();
|
|
#else
|
|
mdctx = EVP_MD_CTX_create();
|
|
#endif
|
|
if ( !mdctx ) {
|
|
rc = -1;
|
|
goto done;
|
|
}
|
|
|
|
EVP_DigestInit_ex( mdctx, md, NULL );
|
|
EVP_DigestUpdate( mdctx, key.bv_val, key.bv_len );
|
|
EVP_DigestFinal_ex( mdctx, (unsigned char *)keyhash.bv_val, &len );
|
|
keyhash.bv_len = len;
|
|
#if OPENSSL_VERSION_NUMBER >= 0x10100000
|
|
EVP_MD_CTX_free( mdctx );
|
|
#else
|
|
EVP_MD_CTX_destroy( mdctx );
|
|
#endif
|
|
} else {
|
|
keyhash = key;
|
|
}
|
|
|
|
if ( ber_bvcmp( hash, &keyhash ) ) {
|
|
rc = LDAP_CONNECT_ERROR;
|
|
Debug0( LDAP_DEBUG_ANY, "tlso_session_pinning: "
|
|
"public key hash does not match provided pin.\n" );
|
|
if ( ld->ld_error ) {
|
|
LDAP_FREE( ld->ld_error );
|
|
}
|
|
ld->ld_error = LDAP_STRDUP(
|
|
_("TLS: public key hash does not match provided pin"));
|
|
}
|
|
|
|
done:
|
|
LDAP_FREE( key.bv_val );
|
|
X509_free( cert );
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* TLS support for LBER Sockbufs
|
|
*/
|
|
|
|
struct tls_data {
|
|
tlso_session *session;
|
|
Sockbuf_IO_Desc *sbiod;
|
|
};
|
|
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000
|
|
#define BIO_set_init(b, x) b->init = x
|
|
#define BIO_set_data(b, x) b->ptr = x
|
|
#define BIO_clear_flags(b, x) b->flags &= ~(x)
|
|
#define BIO_get_data(b) b->ptr
|
|
#endif
|
|
static int
|
|
tlso_bio_create( BIO *b ) {
|
|
BIO_set_init( b, 1 );
|
|
BIO_set_data( b, NULL );
|
|
BIO_clear_flags( b, ~0 );
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
tlso_bio_destroy( BIO *b )
|
|
{
|
|
if ( b == NULL ) return 0;
|
|
|
|
BIO_set_data( b, NULL ); /* sb_tls_remove() will free it */
|
|
BIO_set_init( b, 0 );
|
|
BIO_clear_flags( b, ~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 *)BIO_get_data(b);
|
|
|
|
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 *)BIO_get_data(b);
|
|
|
|
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_setup( void )
|
|
{
|
|
/* it's a source/sink BIO */
|
|
BIO_METHOD * method = BIO_meth_new( 100 | 0x400, "sockbuf glue" );
|
|
BIO_meth_set_write( method, tlso_bio_write );
|
|
BIO_meth_set_read( method, tlso_bio_read );
|
|
BIO_meth_set_puts( method, tlso_bio_puts );
|
|
BIO_meth_set_gets( method, tlso_bio_gets );
|
|
BIO_meth_set_ctrl( method, tlso_bio_ctrl );
|
|
BIO_meth_set_create( method, tlso_bio_create );
|
|
BIO_meth_set_destroy( method, tlso_bio_destroy );
|
|
|
|
return method;
|
|
}
|
|
|
|
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_set_data( bio, 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 ) {
|
|
Debug2( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:%s\n",
|
|
op, state );
|
|
|
|
} 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
|
|
Debug3( 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 ) {
|
|
Debug2( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:failed in %s\n",
|
|
op, state );
|
|
} else if ( ret < 0 ) {
|
|
Debug2( LDAP_DEBUG_TRACE,
|
|
"TLS trace: %s:error in %s\n",
|
|
op, state );
|
|
}
|
|
}
|
|
#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 memory */
|
|
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
|
|
Debug3( LDAP_DEBUG_TRACE,
|
|
"TLS certificate verification: depth: %d, err: %d, subject: %s,",
|
|
errdepth, errnum,
|
|
sname ? sname : "-unknown-" );
|
|
Debug1( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-" );
|
|
if ( !ok ) {
|
|
Debug1( LDAP_DEBUG_ANY,
|
|
"TLS certificate verification: Error, %s\n",
|
|
certerr );
|
|
}
|
|
if ( sname )
|
|
OPENSSL_free ( sname );
|
|
if ( iname )
|
|
OPENSSL_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( char *errmsg )
|
|
{
|
|
unsigned long l;
|
|
char buf[ERRBUFSIZE];
|
|
const char *file;
|
|
int line;
|
|
|
|
while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
|
|
ERR_error_string_n( l, buf, ERRBUFSIZE );
|
|
if ( !*errmsg )
|
|
strcpy(errmsg, buf );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( file ) {
|
|
file = LDAP_STRDUP( file );
|
|
__etoa( (char *)file );
|
|
}
|
|
__etoa( buf );
|
|
#endif
|
|
Debug3( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
|
|
buf, file, line );
|
|
#ifdef HAVE_EBCDIC
|
|
if ( file ) LDAP_FREE( (void *)file );
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000
|
|
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? */
|
|
BIGNUM *bn = BN_new();
|
|
tmp_rsa = NULL;
|
|
if ( bn ) {
|
|
if ( BN_set_word( bn, RSA_F4 )) {
|
|
tmp_rsa = RSA_new();
|
|
if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
|
|
RSA_free( tmp_rsa );
|
|
tmp_rsa = NULL;
|
|
}
|
|
}
|
|
BN_free( bn );
|
|
}
|
|
|
|
if ( !tmp_rsa ) {
|
|
Debug2( LDAP_DEBUG_ANY,
|
|
"TLS: Failed to generate temporary %d-bit %s RSA key\n",
|
|
key_length, is_export ? "export" : "domestic" );
|
|
}
|
|
return tmp_rsa;
|
|
}
|
|
#endif /* OPENSSL_VERSION_NUMBER < 1.1 */
|
|
|
|
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 ) );
|
|
}
|
|
#ifndef OPENSSL_NO_EGD
|
|
else if (RAND_egd(randfile) > 0) {
|
|
/* EGD socket */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
if (randfile == NULL) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: Use configuration file or $RANDFILE to define seed PRNG\n" );
|
|
return -1;
|
|
}
|
|
|
|
total = RAND_load_file(randfile, -1);
|
|
|
|
if (RAND_status() == 0) {
|
|
Debug0( LDAP_DEBUG_ANY,
|
|
"TLS: PRNG not been seeded with enough data\n" );
|
|
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;
|
|
}
|
|
|
|
|
|
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_session_unique,
|
|
tlso_session_endpoint,
|
|
tlso_session_version,
|
|
tlso_session_cipher,
|
|
tlso_session_peercert,
|
|
tlso_session_pinning,
|
|
|
|
&tlso_sbio,
|
|
|
|
#ifdef LDAP_R_COMPILE
|
|
tlso_thr_init,
|
|
#else
|
|
NULL,
|
|
#endif
|
|
|
|
0
|
|
};
|
|
|
|
#endif /* HAVE_OPENSSL */
|