openldap/libraries/libldap/tls.c
2000-10-05 18:30:06 +00:00

1077 lines
23 KiB
C

/* $OpenLDAP$ */
/*
* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*
* tls.c - Handle tls/ssl using SSLeay or OpenSSL.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
#include <ac/unistd.h>
#include <ac/param.h>
#include "ldap-int.h"
#ifdef HAVE_TLS
#ifdef LDAP_R_COMPILE
#include <ldap_pvt_thread.h>
#endif
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#elif defined( HAVE_SSL_H )
#include <ssl.h>
#endif
static int tls_opt_trace = 1;
static char *tls_opt_certfile = NULL;
static char *tls_opt_keyfile = NULL;
static char *tls_opt_cacertfile = NULL;
static char *tls_opt_cacertdir = NULL;
static int tls_opt_require_cert = 0;
static char *tls_opt_ciphersuite = NULL;
static char *tls_opt_randfile = NULL;
#define HAS_TLS( sb ) ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO, \
(void *)&ldap_pvt_sockbuf_io_tls )
static void tls_report_error( void );
static void tls_info_cb( SSL *ssl, int where, int ret );
static int tls_verify_cb( int ok, X509_STORE_CTX *ctx );
static RSA * tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
static STACK_OF(X509_NAME) * get_ca_list( char * bundle, char * dir );
#if 0 /* Currently this is not used by anyone */
static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
#endif
static SSL_CTX *tls_def_ctx = NULL;
static int tls_seed_PRNG( const char *randfile );
#ifdef LDAP_R_COMPILE
/*
* provide mutexes for the SSLeay library.
*/
static ldap_pvt_thread_mutex_t tls_mutexes[CRYPTO_NUM_LOCKS];
static void tls_locking_cb( int mode, int type, const char *file, int line )
{
if ( mode & CRYPTO_LOCK ) {
ldap_pvt_thread_mutex_lock( &tls_mutexes[type] );
} else {
ldap_pvt_thread_mutex_unlock( &tls_mutexes[type] );
}
}
/*
* an extra mutex for the default ctx.
*/
static ldap_pvt_thread_mutex_t tls_def_ctx_mutex;
static void tls_init_threads( void )
{
int i;
for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
ldap_pvt_thread_mutex_init( &tls_mutexes[i] );
}
CRYPTO_set_locking_callback( tls_locking_cb );
/* FIXME: the thread id should be added somehow... */
ldap_pvt_thread_mutex_init( &tls_def_ctx_mutex );
}
#endif /* LDAP_R_COMPILE */
/*
* Initialize TLS subsystem. Should be called only once.
*/
int
ldap_pvt_tls_init( void )
{
static int tls_initialized = 0;
if ( tls_initialized ) return 0;
tls_initialized = 1;
(void) tls_seed_PRNG( tls_opt_randfile );
#ifdef LDAP_R_COMPILE
tls_init_threads();
#endif
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
/* FIXME: mod_ssl does this */
X509V3_add_standard_extensions();
return 0;
}
/*
* initialize the default context
*/
int
ldap_pvt_tls_init_def_ctx( void )
{
STACK_OF(X509_NAME) *calist;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex );
#endif
if ( tls_def_ctx == NULL ) {
tls_def_ctx = SSL_CTX_new( SSLv23_method() );
if ( tls_def_ctx == NULL ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not allocate default ctx.\n",0,0,0);
goto error_exit;
}
if ( tls_opt_ciphersuite &&
!SSL_CTX_set_cipher_list( tls_def_ctx,
tls_opt_ciphersuite ) ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not set cipher list %s.\n",
tls_opt_ciphersuite, 0, 0 );
tls_report_error();
goto error_exit;
}
if (tls_opt_cacertfile != NULL || tls_opt_cacertdir != NULL) {
if ( !SSL_CTX_load_verify_locations( tls_def_ctx,
tls_opt_cacertfile,
tls_opt_cacertdir )
|| !SSL_CTX_set_default_verify_paths( tls_def_ctx ) )
{
Debug( LDAP_DEBUG_ANY,
"TLS: could not load verify locations (file:`%s',dir:`%s').\n",
tls_opt_cacertfile,tls_opt_cacertdir,0);
tls_report_error();
goto error_exit;
}
calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir );
if ( !calist ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not load client CA list (file:`%s',dir:`%s').\n",
tls_opt_cacertfile,tls_opt_cacertdir,0);
tls_report_error();
goto error_exit;
}
SSL_CTX_set_client_CA_list( tls_def_ctx, calist );
}
if ( tls_opt_keyfile &&
!SSL_CTX_use_PrivateKey_file( tls_def_ctx,
tls_opt_keyfile,
SSL_FILETYPE_PEM ) ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not use key file `%s'.\n",
tls_opt_keyfile,0,0);
tls_report_error();
goto error_exit;
}
if ( tls_opt_certfile &&
!SSL_CTX_use_certificate_file( tls_def_ctx,
tls_opt_certfile,
SSL_FILETYPE_PEM ) ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not use certificate `%s'.\n",
tls_opt_certfile,0,0);
tls_report_error();
goto error_exit;
}
if ( ( tls_opt_certfile || tls_opt_keyfile ) &&
!SSL_CTX_check_private_key( tls_def_ctx ) ) {
Debug( LDAP_DEBUG_ANY,
"TLS: private key mismatch.\n",
0,0,0);
tls_report_error();
goto error_exit;
}
if ( tls_opt_trace ) {
SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb );
}
SSL_CTX_set_verify( tls_def_ctx,
tls_opt_require_cert ?
(SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT) :
SSL_VERIFY_NONE,
tls_verify_cb );
SSL_CTX_set_tmp_rsa_callback( tls_def_ctx, tls_tmp_rsa_cb );
/* SSL_CTX_set_tmp_dh_callback( tls_def_ctx, tls_tmp_dh_cb ); */
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
#endif
return 0;
error_exit:
if ( tls_def_ctx != NULL ) {
SSL_CTX_free( tls_def_ctx );
tls_def_ctx = NULL;
}
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
#endif
return -1;
}
static STACK_OF(X509_NAME) *
get_ca_list( char * bundle, char * dir )
{
STACK_OF(X509_NAME) *ca_list = NULL;
if ( bundle ) {
ca_list = SSL_load_client_CA_file( bundle );
}
/*
* FIXME: We have now to go over all files in dir, load them
* and add every certificate there to ca_list.
*/
return ca_list;
}
static SSL *
alloc_handle( void *ctx_arg )
{
SSL_CTX *ctx;
SSL *ssl;
if ( ctx_arg ) {
ctx = (SSL_CTX *) ctx_arg;
} else {
if ( ldap_pvt_tls_init_def_ctx() < 0 )
return NULL;
ctx = tls_def_ctx;
}
ssl = SSL_new( ctx );
if ( ssl == NULL ) {
Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
return NULL;
}
if ( tls_opt_trace ) {
SSL_set_info_callback( ssl, tls_info_cb );
}
return ssl;
}
static int
update_flags( Sockbuf *sb, SSL * ssl, int rc )
{
int err = SSL_get_error(ssl, rc);
sb->sb_trans_needs_read = 0;
sb->sb_trans_needs_write = 0;
if (err == SSL_ERROR_WANT_READ)
{
sb->sb_trans_needs_read = 1;
return 1;
} else if (err == SSL_ERROR_WANT_WRITE)
{
sb->sb_trans_needs_write = 1;
return 1;
} else if (err == SSL_ERROR_WANT_CONNECT)
{
return 1;
}
return 0;
}
/*
* TLS support for LBER Sockbufs
*/
struct tls_data {
SSL *ssl;
Sockbuf_IO_Desc *sbiod;
};
extern BIO_METHOD ldap_pvt_sb_bio_method;
static int
sb_tls_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->ssl = (SSL *)arg;
p->sbiod = sbiod;
bio = BIO_new( &ldap_pvt_sb_bio_method );
bio->ptr = (void *)p;
SSL_set_bio( p->ssl, bio, bio );
sbiod->sbiod_pvt = p;
return 0;
}
static int
sb_tls_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->ssl );
LBER_FREE( sbiod->sbiod_pvt );
sbiod->sbiod_pvt = NULL;
return 0;
}
static int
sb_tls_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->ssl );
return 0;
}
static int
sb_tls_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 ) {
*((SSL **)arg) = p->ssl;
return 1;
}
return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
}
static ber_slen_t
sb_tls_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->ssl, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->ssl, ret );
if (err == SSL_ERROR_WANT_READ ) {
sbiod->sbiod_sb->sb_trans_needs_read = 1;
#ifdef WIN32
errno = EWOULDBLOCK;
#endif
}
else
sbiod->sbiod_sb->sb_trans_needs_read = 0;
return ret;
}
static ber_slen_t
sb_tls_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->ssl, (char *)buf, len );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
err = SSL_get_error( p->ssl, ret );
if (err == SSL_ERROR_WANT_WRITE ) {
sbiod->sbiod_sb->sb_trans_needs_write = 1;
#ifdef WIN32
errno = EWOULDBLOCK;
#endif
}
else
sbiod->sbiod_sb->sb_trans_needs_write = 0;
return ret;
}
Sockbuf_IO ldap_pvt_sockbuf_io_tls =
{
sb_tls_setup, /* sbi_setup */
sb_tls_remove, /* sbi_remove */
sb_tls_ctrl, /* sbi_ctrl */
sb_tls_read, /* sbi_read */
sb_tls_write, /* sbi_write */
sb_tls_close /* sbi_close */
};
static int
sb_tls_bio_create( BIO *b ) {
b->init = 1;
b->num = 0;
b->ptr = NULL;
b->flags = 0;
return 1;
}
static int
sb_tls_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
sb_tls_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 && errno == EWOULDBLOCK )
BIO_set_retry_read( b );
return ret;
}
static int
sb_tls_bio_write( 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_WRITE_NEXT( p->sbiod, buf, len );
BIO_clear_retry_flags( b );
if ( ret < 0 && errno == EWOULDBLOCK )
BIO_set_retry_write( b );
return ret;
}
static long
sb_tls_bio_ctrl( BIO *b, int cmd, long num, char *ptr )
{
if ( cmd == BIO_CTRL_FLUSH ) {
/* The OpenSSL library needs this */
return 1;
}
return 0;
}
static int
sb_tls_bio_gets( BIO *b, char *buf, int len )
{
return -1;
}
static int
sb_tls_bio_puts( BIO *b, char *str )
{
return sb_tls_bio_write( b, str, strlen( str ) );
}
BIO_METHOD ldap_pvt_sb_bio_method =
{
( 100 | 0x400 ), /* it's a source/sink BIO */
"sockbuf glue",
sb_tls_bio_write,
sb_tls_bio_read,
sb_tls_bio_puts,
sb_tls_bio_gets,
sb_tls_bio_ctrl,
sb_tls_bio_create,
sb_tls_bio_destroy
};
/*
* Call this to do a TLS connect on a sockbuf. ctx_arg can be
* a SSL_CTX * or NULL, in which case the default ctx is used.
*
* Return value:
*
* 0 - Success. Connection is ready for communication.
* <0 - Error. Can't create a TLS stream.
* >0 - Partial success.
* Do a select (using information from lber_pvt_sb_needs_{read,write}
* and call again.
*/
int
ldap_pvt_tls_connect( LDAP *ld, Sockbuf *sb, void *ctx_arg )
{
int err;
SSL *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
ssl = alloc_handle( ctx_arg );
if ( ssl == NULL )
return -1;
#ifdef LDAP_DEBUG
ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
#endif
ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
}
err = SSL_connect( ssl );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
if ( err <= 0 ) {
if ( update_flags( sb, ssl, err ))
return 1;
if ((err = ERR_peek_error())) {
char buf[256];
ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
}
Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
LBER_SBIOD_LEVEL_TRANSPORT );
#ifdef LDAP_DEBUG
ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT );
#endif
return -1;
}
return 0;
}
/*
* Call this to do a TLS accept on a sockbuf.
* Everything else is the same as with tls_connect.
*/
int
ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
{
int err;
SSL *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
ssl = alloc_handle( ctx_arg );
if ( ssl == NULL )
return -1;
#ifdef LDAP_DEBUG
ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
#endif
ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
}
err = SSL_accept( ssl );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
if ( err <= 0 ) {
if ( update_flags( sb, ssl, err ))
return 1;
Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
tls_report_error();
ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
LBER_SBIOD_LEVEL_TRANSPORT );
#ifdef LDAP_DEBUG
ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
LBER_SBIOD_LEVEL_TRANSPORT );
#endif
return -1;
}
return 0;
}
int
ldap_pvt_tls_inplace ( Sockbuf *sb )
{
if ( HAS_TLS( sb ) )
return(1);
return(0);
}
void *
ldap_pvt_tls_sb_handle( Sockbuf *sb )
{
void *p;
if (HAS_TLS( sb )) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
return p;
}
return NULL;
}
void *
ldap_pvt_tls_get_handle( LDAP *ld )
{
return ldap_pvt_tls_sb_handle( ld->ld_sb );
}
int
ldap_pvt_tls_get_strength( void *s )
{
SSL_CIPHER *c;
c = SSL_get_current_cipher((SSL *)s);
return SSL_CIPHER_get_bits(c, NULL);
}
const char *
ldap_pvt_tls_get_peer( void *s )
{
X509 *x;
X509_NAME *xn;
char buf[2048], *p;
x = SSL_get_peer_certificate((SSL *)s);
if (!x)
return NULL;
xn = X509_get_subject_name(x);
p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
X509_free(x);
return p;
}
const char *
ldap_pvt_tls_get_peer_issuer( void *s )
{
#if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */
X509 *x;
X509_NAME *xn;
char buf[2048], *p;
x = SSL_get_peer_certificate((SSL *)s);
if (!x)
return NULL;
xn = X509_get_issuer_name(x);
p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
X509_free(x);
return p;
#else
return NULL;
#endif
}
int
ldap_int_tls_config( struct ldapoptions *lo, int option, const char *arg )
{
int i;
switch( option ) {
case LDAP_OPT_X_TLS_CACERTFILE:
case LDAP_OPT_X_TLS_CACERTDIR:
case LDAP_OPT_X_TLS_CERTFILE:
case LDAP_OPT_X_TLS_KEYFILE:
case LDAP_OPT_X_TLS_RANDOM_FILE:
return ldap_pvt_tls_set_option( NULL, option, (void *) arg );
case LDAP_OPT_X_TLS_REQUIRE_CERT:
i = ( ( strcasecmp( arg, "on" ) == 0 ) ||
( strcasecmp( arg, "yes" ) == 0) ||
( strcasecmp( arg, "true" ) == 0 ) );
return ldap_pvt_tls_set_option( NULL, option, (void *) &i );
case LDAP_OPT_X_TLS:
i = -1;
if ( strcasecmp( arg, "never" ) == 0 )
i = LDAP_OPT_X_TLS_NEVER ;
if ( strcasecmp( arg, "demand" ) == 0 )
i = LDAP_OPT_X_TLS_DEMAND ;
if ( strcasecmp( arg, "allow" ) == 0 )
i = LDAP_OPT_X_TLS_ALLOW ;
if ( strcasecmp( arg, "try" ) == 0 )
i = LDAP_OPT_X_TLS_TRY ;
if ( strcasecmp( arg, "hard" ) == 0 )
i = LDAP_OPT_X_TLS_HARD ;
if (i >= 0)
return ldap_pvt_tls_set_option( lo, option, &i );
return -1;
}
return -1;
}
int
ldap_pvt_tls_get_option( struct ldapoptions *lo, int option, void *arg )
{
switch( option ) {
case LDAP_OPT_X_TLS:
*(int *)arg = lo->ldo_tls_mode;
break;
case LDAP_OPT_X_TLS_CERT:
if ( lo == NULL )
*(void **)arg = (void *) tls_def_ctx;
else
*(void **)arg = lo->ldo_tls_ctx;
break;
case LDAP_OPT_X_TLS_CACERTFILE:
*(char **)arg = tls_opt_cacertfile ?
LDAP_STRDUP( tls_opt_cacertfile ) : NULL;
break;
case LDAP_OPT_X_TLS_CACERTDIR:
*(char **)arg = tls_opt_cacertdir ?
LDAP_STRDUP( tls_opt_cacertdir ) : NULL;
break;
case LDAP_OPT_X_TLS_CERTFILE:
*(char **)arg = tls_opt_certfile ?
LDAP_STRDUP( tls_opt_certfile ) : NULL;
break;
case LDAP_OPT_X_TLS_KEYFILE:
*(char **)arg = tls_opt_keyfile ?
LDAP_STRDUP( tls_opt_keyfile ) : NULL;
break;
case LDAP_OPT_X_TLS_REQUIRE_CERT:
*(int *)arg = tls_opt_require_cert;
break;
case LDAP_OPT_X_TLS_RANDOM_FILE:
*(char **)arg = tls_opt_randfile;
break;
default:
return -1;
}
return 0;
}
int
ldap_pvt_tls_set_option( struct ldapoptions *lo, int option, void *arg )
{
switch( option ) {
case LDAP_OPT_X_TLS:
switch( *(int *) arg ) {
case LDAP_OPT_X_TLS_NEVER:
case LDAP_OPT_X_TLS_DEMAND:
case LDAP_OPT_X_TLS_ALLOW:
case LDAP_OPT_X_TLS_TRY:
case LDAP_OPT_X_TLS_HARD:
if (lo != NULL) {
lo->ldo_tls_mode = *(int *)arg;
}
return 0;
}
return -1;
case LDAP_OPT_X_TLS_CERT:
if ( lo == NULL ) {
tls_def_ctx = (SSL_CTX *) arg;
} else {
lo->ldo_tls_ctx = arg;
}
return 0;
}
if ( lo != NULL ) {
return -1;
}
switch( option ) {
case LDAP_OPT_X_TLS_CACERTFILE:
if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile );
tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
case LDAP_OPT_X_TLS_CACERTDIR:
if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir );
tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
case LDAP_OPT_X_TLS_CERTFILE:
if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile );
tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
case LDAP_OPT_X_TLS_KEYFILE:
if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile );
tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
case LDAP_OPT_X_TLS_REQUIRE_CERT:
tls_opt_require_cert = * (int *) arg;
break;
case LDAP_OPT_X_TLS_CIPHER_SUITE:
if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite );
tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
case LDAP_OPT_X_TLS_RANDOM_FILE:
if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
break;
default:
return -1;
}
return 0;
}
int
ldap_pvt_tls_start ( LDAP *ld, Sockbuf *sb, void *ctx_arg )
{
(void) ldap_pvt_tls_init();
/*
* Fortunately, the lib uses blocking io...
*/
if ( ldap_pvt_tls_connect( ld, sb, ctx_arg ) < 0 ) {
return LDAP_CONNECT_ERROR;
}
/* FIXME: hostname of server must be compared with name in
* certificate....
*/
return LDAP_SUCCESS;
}
/* Derived from openssl/apps/s_cb.c */
static void
tls_info_cb( SSL *ssl, int where, int ret )
{
int w;
char *op;
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";
}
if ( where & SSL_CB_LOOP ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:%s\n",
op, SSL_state_string_long( ssl ), 0 );
} else if ( where & SSL_CB_ALERT ) {
op = ( where & SSL_CB_READ ) ? "read" : "write";
Debug( LDAP_DEBUG_TRACE,
"TLS trace: SSL3 alert %s:%s:%s\n",
op,
SSL_alert_type_string_long( ret ),
SSL_alert_desc_string_long( ret) );
} else if ( where & SSL_CB_EXIT ) {
if ( ret == 0 ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:failed in %s\n",
op, SSL_state_string_long( ssl ), 0 );
} else if ( ret < 0 ) {
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:error in %s\n",
op, SSL_state_string_long( ssl ), 0 );
}
}
}
static int
tls_verify_cb( int ok, X509_STORE_CTX *ctx )
{
X509 *cert;
int errnum;
int errdepth;
X509_NAME *subject;
X509_NAME *issuer;
char *sname;
char *iname;
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 );
Debug( LDAP_DEBUG_TRACE,
"TLS certificate verification: depth: %d, subject: %s, issuer: %s\n",
errdepth,
sname ? sname : "-unknown-",
iname ? iname : "-unknown-" );
if ( sname )
CRYPTO_free ( sname );
if ( iname )
CRYPTO_free ( iname );
return ok;
}
/* Inspired by ERR_print_errors in OpenSSL */
static void
tls_report_error( void )
{
unsigned long l;
char buf[200];
const char *file;
int line;
while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
ERR_error_string( l, buf ), file, line );
}
}
static RSA *
tls_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
tls_seed_PRNG( const char *randfile )
{
#ifndef URANDOM_DEVICE
/* no /dev/urandom (or equiv) */
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;
}
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;
}
#endif
return 0;
}
#if 0
static DH *
tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
{
return NULL;
}
#endif
#endif
int
ldap_start_tls_s ( LDAP *ld,
LDAPControl **serverctrls,
LDAPControl **clientctrls )
{
#ifdef HAVE_TLS
int rc;
char *rspoid = NULL;
struct berval *rspdata = NULL;
/* XXYYZ: this initiates operaton only on default connection! */
if ( ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) {
return LDAP_LOCAL_ERROR;
}
rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
NULL, serverctrls, clientctrls, &rspoid, &rspdata );
if ( rc != LDAP_SUCCESS ) {
return rc;
}
if ( rspoid != NULL ) {
LDAP_FREE(rspoid);
}
if ( rspdata != NULL ) {
ber_bvfree( rspdata );
}
rc = ldap_pvt_tls_start( ld, ld->ld_sb, ld->ld_options.ldo_tls_ctx );
return rc;
#else
return LDAP_NOT_SUPPORTED;
#endif
}