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openldap/libraries/libldap/tls.c

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/* $OpenLDAP$ */
/*
* Copyright 1998-2002 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 "ldap_config.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 <ac/dirent.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>
#include <openssl/safestack.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 = LDAP_OPT_X_TLS_DEMAND;
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 *)&sb_tls_sbio )
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 int tls_verify_ok( 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 */
/*
* Tear down the TLS subsystem. Should only be called once.
*/
void
ldap_pvt_tls_destroy( void )
{
SSL_CTX_free(tls_def_ctx);
tls_def_ctx = NULL;
EVP_cleanup();
ERR_free_strings();
if ( tls_opt_certfile ) {
LDAP_FREE( tls_opt_certfile );
tls_opt_certfile = NULL;
}
if ( tls_opt_keyfile ) {
LDAP_FREE( tls_opt_keyfile );
tls_opt_keyfile = NULL;
}
if ( tls_opt_cacertfile ) {
LDAP_FREE( tls_opt_cacertfile );
tls_opt_cacertfile = NULL;
}
if ( tls_opt_cacertdir ) {
LDAP_FREE( tls_opt_cacertdir );
tls_opt_cacertdir = NULL;
}
if ( tls_opt_ciphersuite ) {
LDAP_FREE( tls_opt_ciphersuite );
tls_opt_ciphersuite = NULL;
}
if ( tls_opt_randfile ) {
LDAP_FREE( tls_opt_randfile );
tls_opt_randfile = NULL;
}
}
/*
* 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 ) {
int i;
tls_def_ctx = SSL_CTX_new( SSLv23_method() );
if ( tls_def_ctx == NULL ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_init_def_ctx: "
"TLS could not allocate default ctx (%d).\n",
ERR_peek_error(), 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: could not allocate default ctx (%lu).\n",
ERR_peek_error(),0,0);
#endif
goto error_exit;
}
if ( tls_opt_ciphersuite &&
!SSL_CTX_set_cipher_list( tls_def_ctx, tls_opt_ciphersuite ) )
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_init_def_ctx: "
"TLS could not set cipher list %s.\n",
tls_opt_ciphersuite, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: could not set cipher list %s.\n",
tls_opt_ciphersuite, 0, 0 );
#endif
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 ) )
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"ldap_pvt_tls_init_def_ctx: "
"TLS could not load verify locations "
"(file:`%s',dir:`%s').\n",
tls_opt_cacertfile ? tls_opt_cacertfile : "",
tls_opt_cacertdir ? tls_opt_cacertdir : "", 0 );
#else
Debug( LDAP_DEBUG_ANY, "TLS: "
"could not load verify locations (file:`%s',dir:`%s').\n",
tls_opt_cacertfile ? tls_opt_cacertfile : "",
tls_opt_cacertdir ? tls_opt_cacertdir : "",
0 );
#endif
tls_report_error();
goto error_exit;
}
calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir );
if ( !calist ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_init_def_ctx: "
"TLS could not load client CA list (file: `%s',dir:`%s')\n",
tls_opt_cacertfile ? tls_opt_cacertfile : "",
tls_opt_cacertdir ? tls_opt_cacertdir : "", 0 );
#else
Debug( LDAP_DEBUG_ANY, "TLS: "
"could not load client CA list (file:`%s',dir:`%s').\n",
tls_opt_cacertfile ? tls_opt_cacertfile : "",
tls_opt_cacertdir ? tls_opt_cacertdir : "",
0 );
#endif
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 ) )
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_init_def_ctx: "
"TLS could not use key file `%s'.\n", tls_opt_keyfile, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: could not use key file `%s'.\n",
tls_opt_keyfile,0,0);
#endif
tls_report_error();
goto error_exit;
}
if ( tls_opt_certfile &&
!SSL_CTX_use_certificate_file( tls_def_ctx,
tls_opt_certfile, SSL_FILETYPE_PEM ) )
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_init_def_ctx: "
"TLS could not use certificate `%s'.\n",
tls_opt_certfile, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: could not use certificate `%s'.\n",
tls_opt_certfile,0,0);
#endif
tls_report_error();
goto error_exit;
}
if ( ( tls_opt_certfile || tls_opt_keyfile ) &&
!SSL_CTX_check_private_key( tls_def_ctx ) )
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"ldap_pvt_tls_init_def_ctx: TLS private key mismatch.\n",
0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: private key mismatch.\n",
0,0,0);
#endif
tls_report_error();
goto error_exit;
}
if ( tls_opt_trace ) {
SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb );
}
i = SSL_VERIFY_NONE;
if ( tls_opt_require_cert ) {
i = SSL_VERIFY_PEER;
if ( tls_opt_require_cert == LDAP_OPT_X_TLS_DEMAND ||
tls_opt_require_cert == LDAP_OPT_X_TLS_HARD ) {
i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
}
SSL_CTX_set_verify( tls_def_ctx, i,
tls_opt_require_cert == LDAP_OPT_X_TLS_ALLOW ?
tls_verify_ok : 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 );
}
#if defined(HAVE_DIRENT_H) || defined(dirent)
if ( dir ) {
DIR *dirp;
struct dirent *d;
char buf[MAXPATHLEN];
int l = strlen(dir), freeit = 0;
if (l > sizeof(buf))
goto done;
dirp = opendir( dir );
if ( !ca_list ) {
ca_list = sk_X509_NAME_new_null();
freeit = 1;
}
strcpy(buf, dir);
while ( dirp ) {
if ( ( d = readdir( dirp )) == NULL) {
closedir( dirp );
break;
}
if (l + sizeof(LDAP_DIRSEP) + NAMLEN(d) > sizeof(buf))
continue;
sprintf( buf+l, LDAP_DIRSEP "%s", d->d_name );
if ( SSL_add_file_cert_subjects_to_stack(ca_list, buf)) {
freeit = 0;
}
}
if ( freeit ) {
sk_X509_NAME_free( ca_list );
ca_list = NULL;
}
}
#endif
done:
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 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"alloc_handle: TLS can't create ssl handle.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
#endif
return NULL;
}
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;
};
static BIO_METHOD sb_tls_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( &sb_tls_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;
} else if ( opt == LBER_SB_OPT_DATA_READY ) {
if( SSL_pending( p->ssl ) > 0 ) {
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;
errno = EWOULDBLOCK;
}
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;
errno = EWOULDBLOCK;
} else {
sbiod->sbiod_sb->sb_trans_needs_write = 0;
}
return ret;
}
static Sockbuf_IO sb_tls_sbio =
{
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, 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 && errno == EWOULDBLOCK ) {
BIO_set_retry_write( b );
}
return ret;
}
static long
sb_tls_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
sb_tls_bio_gets( BIO *b, char *buf, int len )
{
return -1;
}
static int
sb_tls_bio_puts( BIO *b, const char *str )
{
return sb_tls_bio_write( b, str, strlen( str ) );
}
static BIO_METHOD sb_tls_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.
*/
static int
ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
{
Sockbuf *sb = conn->lconn_sb;
int err;
SSL *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
void *ctx = ld->ld_defconn
? ld->ld_defconn->lconn_tls_ctx : NULL;
ssl = alloc_handle( ctx );
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, &sb_tls_sbio,
LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
if( ctx == NULL ) {
conn->lconn_tls_ctx = tls_def_ctx;
}
}
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));
}
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"ldap_int_tls_connect: TLS can't connect.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
#endif
ber_sockbuf_remove_io( sb, &sb_tls_sbio,
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, &sb_tls_sbio,
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;
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"ldap_pvt_tls_accept: TLS can't accept.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
#endif
tls_report_error();
ber_sockbuf_remove_io( sb, &sb_tls_sbio,
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 )
{
return HAS_TLS( sb ) ? 1 : 0;
}
void *
ldap_pvt_tls_sb_ctx( Sockbuf *sb )
{
void *p;
if (HAS_TLS( sb )) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
return p;
}
return NULL;
}
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);
}
int
ldap_pvt_tls_get_my_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags )
{
X509 *x;
X509_NAME *xn;
int rc;
x = SSL_get_certificate((SSL *)s);
if (!x) return LDAP_INVALID_CREDENTIALS;
xn = X509_get_subject_name(x);
rc = ldap_X509dn2bv(xn, dn, (LDAPDN_rewrite_func *)func, flags );
X509_free(x);
return rc;
}
static X509 *
tls_get_cert( SSL *s )
{
/* If peer cert was bad, treat as if no cert was given */
if (SSL_get_verify_result(s)) {
/* If we can send an alert, do so */
if (SSL_version(s) != SSL2_VERSION) {
ssl3_send_alert(s,SSL3_AL_WARNING,SSL3_AD_BAD_CERTIFICATE);
}
return NULL;
}
return SSL_get_peer_certificate(s);
}
int
ldap_pvt_tls_get_peer_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags )
{
X509 *x;
X509_NAME *xn;
int rc;
x = tls_get_cert((SSL *)s);
if (!x) return LDAP_INVALID_CREDENTIALS;
xn = X509_get_subject_name(x);
rc = ldap_X509dn2bv(xn, dn, (LDAPDN_rewrite_func *)func, flags);
X509_free(x);
return rc;
}
char *
ldap_pvt_tls_get_peer_hostname( void *s )
{
X509 *x;
X509_NAME *xn;
char buf[2048], *p;
int ret;
x = tls_get_cert((SSL *)s);
if (!x) return NULL;
xn = X509_get_subject_name(x);
ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf));
if( ret == -1 ) {
X509_free(x);
return NULL;
}
p = LDAP_STRDUP(buf);
X509_free(x);
return p;
}
int
ldap_pvt_tls_check_hostname( LDAP *ld, void *s, const char *name_in )
{
int i, ret = LDAP_LOCAL_ERROR;
X509 *x;
const char *name;
if( ldap_int_hostname &&
( !name_in || !strcasecmp( name_in, "localhost" ) ) )
{
name = ldap_int_hostname;
} else {
name = name_in;
}
x = tls_get_cert((SSL *)s);
if (!x) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"ldap_pvt_tls_check_hostname: "
"TLS unable to get peer certificate.\n" , 0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get peer certificate.\n",
0, 0, 0 );
#endif
/* If this was a fatal condition, things would have
* aborted long before now.
*/
return LDAP_SUCCESS;
}
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, len2 = 0;
char *domain;
GENERAL_NAME *gn;
len1 = strlen(name);
n = sk_GENERAL_NAME_num(alt);
domain = strchr(name, '.');
if (domain) {
len2 = len1 - (domain-name);
}
for (i=0; i<n; i++) {
gn = sk_GENERAL_NAME_value(alt, i);
if (gn->type == GEN_DNS) {
char *sn = ASN1_STRING_data(gn->d.ia5);
int sl = ASN1_STRING_length(gn->d.ia5);
/* Is this an exact match? */
if ((len1 == sl) && !strncasecmp(name, sn, len1)) {
break;
}
/* Is this a wildcard match? */
if ((*sn == '*') && domain && (len2 == sl-1) &&
!strncasecmp(domain, sn+1, len2))
{
break;
}
#if 0
/* Is this a RFC 2549 style wildcard match? */
if ((*sn == '.') && domain && (len2 == sl) &&
!strncasecmp(domain, sn, len2))
{
break;
}
#endif
}
}
GENERAL_NAMES_free(alt);
if (i < n) { /* Found a match */
ret = LDAP_SUCCESS;
}
}
}
if (ret != LDAP_SUCCESS) {
X509_NAME *xn;
char buf[2048];
xn = X509_get_subject_name(x);
if( X509_NAME_get_text_by_NID( xn, NID_commonName,
buf, sizeof(buf)) == -1)
{
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_check_hostname: "
"TLS unable to get common name from peer certificate.\n",
0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get common name from peer certificate.\n",
0, 0, 0 );
#endif
ld->ld_error = LDAP_STRDUP("TLS: unable to get CN from peer certificate");
} else if (strcasecmp(name, buf)) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR, "ldap_pvt_tls_check_hostname: "
"TLS hostname (%s) does not match "
"common name in certificate (%s).\n", name, buf, 0 );
#else
Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
"common name in certificate (%s).\n",
name, buf, 0 );
#endif
ret = LDAP_CONNECT_ERROR;
ld->ld_error = LDAP_STRDUP("TLS: hostname does not match CN in peer certificate");
} else {
ret = LDAP_SUCCESS;
}
}
X509_free(x);
return ret;
}
const char *
ldap_pvt_tls_get_peer_issuer( void *s )
{
#if 0 /* currently unused; see ldap_pvt_tls_get_peer_dn() 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( LDAP *ld, 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( ld, option, (void *) arg );
case LDAP_OPT_X_TLS_REQUIRE_CERT:
case LDAP_OPT_X_TLS:
i = -1;
if ( strcasecmp( arg, "never" ) == 0 ) {
i = LDAP_OPT_X_TLS_NEVER ;
} else if ( strcasecmp( arg, "demand" ) == 0 ) {
i = LDAP_OPT_X_TLS_DEMAND ;
} else if ( strcasecmp( arg, "allow" ) == 0 ) {
i = LDAP_OPT_X_TLS_ALLOW ;
} else if ( strcasecmp( arg, "try" ) == 0 ) {
i = LDAP_OPT_X_TLS_TRY ;
} else if ( ( strcasecmp( arg, "hard" ) == 0 ) ||
( strcasecmp( arg, "on" ) == 0 ) ||
( strcasecmp( arg, "yes" ) == 0) ||
( strcasecmp( arg, "true" ) == 0 ) )
{
i = LDAP_OPT_X_TLS_HARD ;
}
if (i >= 0) {
return ldap_pvt_tls_set_option( ld, option, &i );
}
return -1;
}
return -1;
}
int
ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
{
struct ldapoptions *lo;
if( ld != NULL ) {
assert( LDAP_VALID( ld ) );
if( !LDAP_VALID( ld ) ) {
return LDAP_OPT_ERROR;
}
lo = &ld->ld_options;
} else {
/* Get pointer to global option structure */
lo = LDAP_INT_GLOBAL_OPT();
if ( lo == NULL ) {
return LDAP_NO_MEMORY;
}
}
switch( option ) {
case LDAP_OPT_X_TLS:
*(int *)arg = lo->ldo_tls_mode;
break;
case LDAP_OPT_X_TLS_CTX:
if ( ld == NULL ) {
*(void **)arg = (void *) tls_def_ctx;
} else {
*(void **)arg = ld->ld_defconn->lconn_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 ?
LDAP_STRDUP( tls_opt_randfile ) : NULL;
break;
case LDAP_OPT_X_TLS_SSL_CTX: {
void *retval = 0;
if ( ld != NULL ) {
LDAPConn *conn = ld->ld_defconn;
if ( conn != NULL ) {
Sockbuf *sb = conn->lconn_sb;
retval = ldap_pvt_tls_sb_ctx( sb );
}
}
*(void **)arg = retval;
break;
}
default:
return -1;
}
return 0;
}
int
ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
{
struct ldapoptions *lo;
if( ld != NULL ) {
assert( LDAP_VALID( ld ) );
if( !LDAP_VALID( ld ) ) {
return LDAP_OPT_ERROR;
}
lo = &ld->ld_options;
} else {
/* Get pointer to global option structure */
lo = LDAP_INT_GLOBAL_OPT();
if ( lo == NULL ) {
return LDAP_NO_MEMORY;
}
}
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_CTX:
if ( ld == NULL ) {
tls_def_ctx = (SSL_CTX *) arg;
} else {
ld->ld_defconn->lconn_tls_ctx = arg;
}
return 0;
}
if ( ld != 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:
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:
tls_opt_require_cert = * (int *) arg;
return 0;
}
return -1;
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_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv )
{
Sockbuf *sb = conn->lconn_sb;
char *host;
void *ssl;
if( srv ) {
host = srv->lud_host;
} else {
host = conn->lconn_server->lud_host;
}
/* avoid NULL host */
if( host == NULL ) {
host = "localhost";
}
(void) ldap_pvt_tls_init();
/*
* Fortunately, the lib uses blocking io...
*/
if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
ld->ld_errno = LDAP_CONNECT_ERROR;
return (ld->ld_errno);
}
ssl = ldap_pvt_tls_sb_ctx( sb );
assert( ssl != NULL );
/*
* compare host with name(s) in certificate
*/
ld->ld_errno = ldap_pvt_tls_check_hostname( ld, ssl, host );
if (ld->ld_errno != LDAP_SUCCESS) {
return ld->ld_errno;
}
/*
* set SASL properties to TLS ssf and authid
*/
{
struct berval authid = { 0, NULL };
ber_len_t ssf;
/* we need to let SASL know */
ssf = ldap_pvt_tls_get_strength( ssl );
/* failure is OK, we just can't use SASL EXTERNAL */
(void) ldap_pvt_tls_get_my_dn( ssl, &authid, NULL, 0 );
(void) ldap_int_sasl_external( ld, conn, authid.bv_val, ssf );
LDAP_FREE( authid.bv_val );
}
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 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, DETAIL1, "tls_info_cb: "
"TLS trace: %s:%s\n", op, SSL_state_string_long( ssl ), 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:%s\n",
op, SSL_state_string_long( ssl ), 0 );
#endif
} else if ( where & SSL_CB_ALERT ) {
op = ( where & SSL_CB_READ ) ? "read" : "write";
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, DETAIL1,
"tls_info_cb: TLS trace: SSL3 alert %s:%s:%s\n",
op, SSL_alert_type_string_long( ret ),
SSL_alert_desc_string_long( ret) );
#else
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) );
#endif
} else if ( where & SSL_CB_EXIT ) {
if ( ret == 0 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"tls_info_cb: TLS trace: %s:failed in %s\n",
op, SSL_state_string_long( ssl ), 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:failed in %s\n",
op, SSL_state_string_long( ssl ), 0 );
#endif
} else if ( ret < 0 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"tls_info_cb: TLS trace: %s:error in %s\n",
op, SSL_state_string_long( ssl ), 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"TLS trace: %s:error in %s\n",
op, SSL_state_string_long( ssl ), 0 );
#endif
}
}
}
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 );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ERR,
"TLS certificate verification: depth: %d, err: %d, subject: %s,",
errdepth, errnum,
sname ? sname : "-unknown-" );
LDAP_LOG( TRANSPORT, ERR, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 );
if ( !ok ) {
LDAP_LOG ( TRANSPORT, ERR,
"TLS certificate verification: Error, %s\n",
X509_verify_cert_error_string(errnum), 0, 0 );
}
#else
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",
X509_verify_cert_error_string(errnum), 0, 0 );
}
#endif
if ( sname )
CRYPTO_free ( sname );
if ( iname )
CRYPTO_free ( iname );
return ok;
}
static int
tls_verify_ok( int ok, X509_STORE_CTX *ctx )
{
(void) tls_verify_cb( ok, ctx );
return 1;
}
/* 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 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"tls_report_error: TLS %s %s:%d\n",
ERR_error_string( l, buf ), file, line );
#else
Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
ERR_error_string( l, buf ), file, line );
#endif
}
}
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 ) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, ERR,
"tls_tmp_rsa_cb: TLS Failed to generate temporary %d-bit %s "
"RSA key\n", key_length, is_export ? "export" : "domestic", 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: Failed to generate temporary %d-bit %s RSA key\n",
key_length, is_export ? "export" : "domestic", 0 );
#endif
return NULL;
}
return tmp_rsa;
}
static int
tls_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 $HOME is NULL, .rnd is used.
*/
randfile = RAND_file_name( buffer, sizeof( buffer ) );
} else if (RAND_egd(randfile) > 0) {
/* EGD socket */
return 0;
}
if (randfile == NULL) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, DETAIL1,
"tls_seed_PRNG: TLS Use configuration file or "
"$RANDFILE to define seed PRNG\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
0, 0, 0);
#endif
return -1;
}
total = RAND_load_file(randfile, -1);
if (RAND_status() == 0) {
#ifdef NEW_LOGGING
LDAP_LOG ( TRANSPORT, DETAIL1,
"tls_seed_PRNG: TLS PRNG not been seeded with enough data\n",
0, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"TLS: PRNG not been seeded with enough data\n",
0, 0, 0);
#endif
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;
}
#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 )
{
int rc;
#ifdef HAVE_TLS
char *rspoid = NULL;
struct berval *rspdata = NULL;
/* XXYYZ: this initiates operation only on default connection! */
if ( ld->ld_sb != NULL && 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_int_tls_start( ld, ld->ld_defconn, NULL );
#else
rc = LDAP_NOT_SUPPORTED;
#endif
return rc;
}
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