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openldap/libraries/libldap/gnutls.c

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/* gnutls.c - Handle tls/ssl using GNUTLS. */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2007 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
*/
#include "portable.h"
#if 1 /* HAVE_GNUTLS */
#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/ctype.h>
#include <ac/time.h>
#include <ac/unistd.h>
#include <ac/param.h>
#include <ac/dirent.h>
#include "ldap-int.h"
#include "ldap_schema.h"
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gcrypt.h>
#define DH_BITS (1024)
#ifdef LDAP_R_COMPILE
# include <ldap_pvt_thread.h>
static int
ldap_pvt_gcry_mutex_init( void **priv )
{
int err = 0;
ldap_pvt_thread_mutex_t *lock = LDAP_MALLOC( sizeof( ldap_pvt_thread_mutex_t ));
if ( !lock )
err = ENOMEM;
if ( !err ) {
err = ldap_pvt_thread_mutex_init( lock );
if ( err )
LDAP_FREE( lock );
else
*priv = lock;
}
return err;
}
static int
ldap_pvt_gcry_mutex_destroy( void **lock )
{
int err = ldap_pvt_thread_mutex_destroy( *lock );
LDAP_FREE( *lock );
return err;
}
static int
ldap_pvt_gcry_mutex_lock( void **lock )
{
return ldap_pvt_thread_mutex_lock( *lock );
}
static int
ldap_pvt_gcry_mutex_unlock( void **lock )
{
return ldap_pvt_thread_mutex_unlock( *lock );
}
static struct gcry_thread_cbs ldap_generic_thread_cbs = {
GCRY_THREAD_OPTION_USER,
NULL,
ldap_pvt_gcry_mutex_init,
ldap_pvt_gcry_mutex_destroy,
ldap_pvt_gcry_mutex_lock,
ldap_pvt_gcry_mutex_unlock,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
#endif
/* sorta replacing SSL_CTX */
typedef struct ldap_pvt_tls_ctx {
struct ldapoptions *lo;
int *cipher_list;
gnutls_certificate_credentials_t cred;
gnutls_dh_params_t dh_params;
unsigned long verify_depth;
int refcount;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_t ref_mutex;
#endif
} ldap_pvt_tls_ctx_t;
/* sorta replacing SSL */
typedef struct ldap_pvt_gnutls_session {
gnutls_session_t session;
struct berval peer_der_dn;
} ldap_pvt_gnutls_session_t;
#define HAS_TLS( sb ) ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO, \
(void *)&sb_tls_sbio )
/* RFC2459 minimum required set of supported attribute types
*/
typedef struct oid_name {
struct berval oid;
struct berval name;
} oid_name;
#define CN_OID oids[0].oid.bv_val
static oid_name oids[] = {
{ BER_BVC("2.5.4.3"), BER_BVC("cn") },
{ BER_BVC("2.5.4.4"), BER_BVC("sn") },
{ BER_BVC("2.5.4.6"), BER_BVC("c") },
{ BER_BVC("2.5.4.7"), BER_BVC("l") },
{ BER_BVC("2.5.4.8"), BER_BVC("st") },
{ BER_BVC("2.5.4.10"), BER_BVC("o") },
{ BER_BVC("2.5.4.11"), BER_BVC("ou") },
{ BER_BVC("2.5.4.12"), BER_BVC("title") },
{ BER_BVC("2.5.4.41"), BER_BVC("name") },
{ BER_BVC("2.5.4.42"), BER_BVC("givenName") },
{ BER_BVC("2.5.4.43"), BER_BVC("initials") },
{ BER_BVC("2.5.4.44"), BER_BVC("generationQualifier") },
{ BER_BVC("2.5.4.46"), BER_BVC("dnQualifier") },
{ BER_BVC("1.2.840.113549.1.9.1"), BER_BVC("email") },
{ BER_BVC("0.9.2342.19200300.100.1.25"), BER_BVC("dc") },
{ BER_BVNULL, BER_BVNULL }
};
ldap_pvt_tls_ctx_t *
ldap_pvt_tls_ctx_new ( struct ldapoptions *lo )
{
ldap_pvt_tls_ctx_t *ctx;
ctx = ber_memcalloc ( 1, sizeof (*ctx) );
if ( ctx ) {
ctx->lo = lo;
if ( gnutls_certificate_allocate_credentials( &ctx->cred ) < 0 ) {
ber_memfree( ctx );
return NULL;
}
ctx->refcount = 1;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_init( &ctx->ref_mutex );
#endif
}
return ctx;
}
void
ldap_pvt_tls_ctx_free ( void *c )
{
int refcount;
ldap_pvt_tls_ctx_t *ctx = c;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ctx->ref_mutex );
#endif
refcount = --ctx->refcount;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ctx->ref_mutex );
#endif
if ( refcount )
return;
gnutls_certificate_free_credentials( ctx->cred );
ber_memfree ( ctx );
}
static void
ldap_pvt_tls_ctx_ref( ldap_pvt_tls_ctx_t * ctx )
{
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_lock( &ctx->ref_mutex );
#endif
ctx->refcount++;
#ifdef LDAP_R_COMPILE
ldap_pvt_thread_mutex_unlock( &ctx->ref_mutex );
#endif
}
ldap_pvt_gnutls_session_t *
ldap_pvt_gnutls_session_new ( ldap_pvt_tls_ctx_t * ctx, int is_server )
{
ldap_pvt_gnutls_session_t *session;
session = ber_memcalloc ( 1, sizeof (*session) );
if ( !session )
return NULL;
gnutls_init( &session->session, is_server ? GNUTLS_SERVER : GNUTLS_CLIENT );
gnutls_set_default_priority( session->session );
if ( ctx->cred )
gnutls_credentials_set( session->session, GNUTLS_CRD_CERTIFICATE, ctx->cred );
if ( is_server ) {
int flag = 0;
if ( ctx->lo->ldo_tls_require_cert ) {
flag = GNUTLS_CERT_REQUEST;
if ( ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
ctx->lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD )
flag = GNUTLS_CERT_REQUIRE;
gnutls_certificate_server_set_request( session->session, flag );
}
}
return session;
}
void
ldap_pvt_gnutls_session_free ( ldap_pvt_gnutls_session_t * session )
{
ber_memfree ( session );
}
#ifdef LDAP_R_COMPILE
static void
tls_init_threads( void )
{
gcry_control (GCRYCTL_SET_THREAD_CBS, &ldap_generic_thread_cbs);
}
#endif
void
ldap_int_tls_destroy( struct ldapoptions *lo )
{
if ( lo->ldo_tls_ctx ) {
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = NULL;
}
if ( lo->ldo_tls_certfile ) {
LDAP_FREE( lo->ldo_tls_certfile );
lo->ldo_tls_certfile = NULL;
}
if ( lo->ldo_tls_keyfile ) {
LDAP_FREE( lo->ldo_tls_keyfile );
lo->ldo_tls_keyfile = NULL;
}
if ( lo->ldo_tls_dhfile ) {
LDAP_FREE( lo->ldo_tls_dhfile );
lo->ldo_tls_dhfile = NULL;
}
if ( lo->ldo_tls_cacertfile ) {
LDAP_FREE( lo->ldo_tls_cacertfile );
lo->ldo_tls_cacertfile = NULL;
}
if ( lo->ldo_tls_cacertdir ) {
LDAP_FREE( lo->ldo_tls_cacertdir );
lo->ldo_tls_cacertdir = NULL;
}
if ( lo->ldo_tls_ciphersuite ) {
LDAP_FREE( lo->ldo_tls_ciphersuite );
lo->ldo_tls_ciphersuite = NULL;
}
}
/*
* Tear down the TLS subsystem. Should only be called once.
*/
void
ldap_pvt_tls_destroy( void )
{
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
ldap_int_tls_destroy( lo );
gnutls_global_deinit();
}
/*
* Initialize TLS subsystem. Should be called only once.
*/
int
ldap_pvt_tls_init( void )
{
static int tls_initialized = 0;
if ( tls_initialized++ ) return 0;
#ifdef LDAP_R_COMPILE
tls_init_threads();
#endif
gnutls_global_init ();
return 0;
}
/*
* initialize a new TLS context
*/
static int
ldap_int_tls_init_ctx( struct ldapoptions *lo, int is_server )
{
int i, rc = 0;
char *ciphersuite = lo->ldo_tls_ciphersuite;
char *cacertfile = lo->ldo_tls_cacertfile;
char *cacertdir = lo->ldo_tls_cacertdir;
char *certfile = lo->ldo_tls_certfile;
char *keyfile = lo->ldo_tls_keyfile;
char *dhfile = lo->ldo_tls_dhfile;
if ( lo->ldo_tls_ctx )
return 0;
ldap_pvt_tls_init();
if ( is_server && !certfile && !keyfile && !cacertfile && !cacertdir ) {
/* minimum configuration not provided */
return LDAP_NOT_SUPPORTED;
}
#ifdef HAVE_EBCDIC
/* This ASCII/EBCDIC handling is a real pain! */
if ( ciphersuite ) {
ciphersuite = LDAP_STRDUP( ciphersuite );
__atoe( ciphersuite );
}
if ( cacertfile ) {
cacertfile = LDAP_STRDUP( cacertfile );
__atoe( cacertfile );
}
if ( cacertdir ) {
cacertdir = LDAP_STRDUP( cacertdir );
__atoe( cacertdir );
}
if ( certfile ) {
certfile = LDAP_STRDUP( certfile );
__atoe( certfile );
}
if ( keyfile ) {
keyfile = LDAP_STRDUP( keyfile );
__atoe( keyfile );
}
if ( dhfile ) {
dhfile = LDAP_STRDUP( dhfile );
__atoe( dhfile );
}
#endif
lo->ldo_tls_ctx = ldap_pvt_tls_ctx_new ( lo );
if ( lo->ldo_tls_ctx == NULL ) {
Debug( LDAP_DEBUG_ANY,
"TLS: could not allocate default ctx.\n",
0,0,0);
rc = -1;
goto error_exit;
}
/* fixme convert ciphersuite spec formats? */
/* if ( lo->ldo_tls_ciphersuite && hm ) { */
/* Debug( LDAP_DEBUG_ANY, */
/* "TLS: could not set cipher list %s.\n", */
/* lo->ldo_tls_ciphersuite, 0, 0 ); */
/* tls_report_error(); */
/* rc = -1; */
/* goto error_exit; */
/* } */
if (lo->ldo_tls_cacertdir != NULL) {
Debug( LDAP_DEBUG_ANY,
"TLS: warning: cacertdir not implemented for gnutls\n",
NULL, NULL, NULL );
}
if (lo->ldo_tls_cacertfile != NULL) {
rc = gnutls_certificate_set_x509_trust_file(
((ldap_pvt_tls_ctx_t*) lo->ldo_tls_ctx)->cred,
lo->ldo_tls_cacertfile,
GNUTLS_X509_FMT_PEM );
if ( rc < 0 ) goto error_exit;
}
if ( lo->ldo_tls_certfile && lo->ldo_tls_keyfile ) {
rc = gnutls_certificate_set_x509_key_file(
((ldap_pvt_tls_ctx_t*) lo->ldo_tls_ctx)->cred,
lo->ldo_tls_certfile,
lo->ldo_tls_keyfile,
GNUTLS_X509_FMT_PEM );
if ( rc ) goto error_exit;
} else if ( lo->ldo_tls_certfile || lo->ldo_tls_keyfile ) {
Debug( LDAP_DEBUG_ANY,
"TLS: only one of certfile and keyfile specified\n",
NULL, NULL, NULL );
rc = 1;
goto error_exit;
}
if ( lo->ldo_tls_dhfile ) {
Debug( LDAP_DEBUG_ANY,
"TLS: warning: ignoring dhfile\n",
NULL, NULL, NULL );
}
gnutls_dh_params_init (&((ldap_pvt_tls_ctx_t*)
lo->ldo_tls_ctx)->dh_params);
gnutls_dh_params_generate2 (((ldap_pvt_tls_ctx_t*)
lo->ldo_tls_ctx)->dh_params,
DH_BITS);
/* fixme verify options */
/* 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( lo->ldo_tls_ctx, i, */
/* lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ? */
/* tls_verify_ok : tls_verify_cb ); */
/* SSL_CTX_set_tmp_rsa_callback( lo->ldo_tls_ctx, tls_tmp_rsa_cb ); */
/* if ( lo->ldo_tls_dhfile ) { */
/* SSL_CTX_set_tmp_dh_callback( lo->ldo_tls_ctx, tls_tmp_dh_cb ); */
/* } */
/* fixme crl check */
error_exit:
#ifdef HAVE_EBCDIC
LDAP_FREE( ciphersuite );
LDAP_FREE( cacertfile );
LDAP_FREE( cacertdir );
LDAP_FREE( certfile );
LDAP_FREE( keyfile );
LDAP_FREE( dhfile );
#endif
return rc;
}
/*
* initialize the default context
*/
int
ldap_pvt_tls_init_def_ctx( int is_server )
{
return ldap_int_tls_init_ctx( LDAP_INT_GLOBAL_OPT(), is_server );
}
static ldap_pvt_gnutls_session_t *
alloc_handle( void *ctx_arg, int is_server )
{
ldap_pvt_tls_ctx_t *ctx;
ldap_pvt_gnutls_session_t *session;
if ( ctx_arg ) {
ctx = (ldap_pvt_tls_ctx_t *) ctx_arg;
} else {
struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
if ( ldap_pvt_tls_init_def_ctx( is_server ) < 0 ) return NULL;
ctx = lo->ldo_tls_ctx;
}
session = ldap_pvt_gnutls_session_new( ctx, is_server );
if ( session == NULL ) {
Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
return NULL;
}
return session;
}
static int
update_flags( Sockbuf *sb,
ldap_pvt_gnutls_session_t * session,
int rc )
{
sb->sb_trans_needs_read = 0;
sb->sb_trans_needs_write = 0;
if ( rc != GNUTLS_E_INTERRUPTED && rc != GNUTLS_E_AGAIN )
return 0;
switch (gnutls_record_get_direction (session->session)) {
case 0:
sb->sb_trans_needs_read = 1;
return 1;
case 1:
sb->sb_trans_needs_write = 1;
return 1;
}
return 0;
}
/*
* TLS support for LBER Sockbufs
*/
struct tls_data {
ldap_pvt_gnutls_session_t *session;
Sockbuf_IO_Desc *sbiod;
};
static ssize_t
sb_gtls_recv( gnutls_transport_ptr_t ptr, void *buf, size_t len )
{
struct tls_data *p;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
return LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
}
static ssize_t
sb_gtls_send( gnutls_transport_ptr_t ptr, const void *buf, size_t len )
{
struct tls_data *p;
if ( buf == NULL || len <= 0 ) return 0;
p = (struct tls_data *)ptr;
if ( p == NULL || p->sbiod == NULL ) {
return 0;
}
return LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
}
static int
sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
{
struct tls_data *p;
ldap_pvt_gnutls_session_t *session = arg;
assert( sbiod != NULL );
p = LBER_MALLOC( sizeof( *p ) );
if ( p == NULL ) {
return -1;
}
gnutls_transport_set_ptr( session->session, (gnutls_transport_ptr)p );
gnutls_transport_set_pull_function( session->session, sb_gtls_recv );
gnutls_transport_set_push_function( session->session, sb_gtls_send );
p->session = arg;
p->sbiod = sbiod;
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;
gnutls_deinit ( p->session->session );
LBER_FREE( p->session );
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;
gnutls_bye ( p->session->session, GNUTLS_SHUT_RDWR );
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 ) {
*((ldap_pvt_gnutls_session_t **)arg) = p->session;
return 1;
} else if ( opt == LBER_SB_OPT_DATA_READY ) {
if( gnutls_record_check_pending( p->session->session ) > 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 = gnutls_record_recv ( p->session->session, buf, len );
switch (ret) {
case GNUTLS_E_INTERRUPTED:
case GNUTLS_E_AGAIN:
sbiod->sbiod_sb->sb_trans_needs_read = 1;
sock_errset(EWOULDBLOCK);
ret = 0;
break;
case GNUTLS_E_REHANDSHAKE:
for ( ret = gnutls_handshake ( p->session->session );
ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN;
ret = gnutls_handshake ( p->session->session ) );
sbiod->sbiod_sb->sb_trans_needs_read = 1;
ret = 0;
break;
default:
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 = gnutls_record_send ( p->session->session, (char *)buf, len );
if ( ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ) {
sbiod->sbiod_sb->sb_trans_needs_write = 1;
sock_errset(EWOULDBLOCK);
ret = 0;
} 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 */
};
/*
* 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;
ldap_pvt_gnutls_session_t *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
struct ldapoptions *lo;
ldap_pvt_tls_ctx_t *ctx;
ctx = ld->ld_options.ldo_tls_ctx;
ssl = alloc_handle( ctx, 0 );
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 );
lo = LDAP_INT_GLOBAL_OPT();
if( ctx == NULL ) {
ctx = lo->ldo_tls_ctx;
ldap_pvt_tls_ctx_ref( ctx );
ld->ld_options.ldo_tls_ctx = ctx;
}
if ( ld->ld_options.ldo_tls_connect_cb )
ld->ld_options.ldo_tls_connect_cb( ld, ssl, ctx,
ld->ld_options.ldo_tls_connect_arg );
if ( lo && lo->ldo_tls_connect_cb && lo->ldo_tls_connect_cb !=
ld->ld_options.ldo_tls_connect_cb )
lo->ldo_tls_connect_cb( ld, ssl, ctx, lo->ldo_tls_connect_arg );
}
err = gnutls_handshake( ssl->session );
#ifdef HAVE_WINSOCK
errno = WSAGetLastError();
#endif
if ( err < 0 ) {
if ( update_flags( sb, ssl, err )) {
return 1;
}
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(gnutls_strerror( err ));
#ifdef HAVE_EBCDIC
if ( ld->ld_error ) __etoa(ld->ld_error);
#endif
Debug( LDAP_DEBUG_ANY,"TLS: can't connect: %s\n",
ld->ld_error ? ld->ld_error : "" ,0,0);
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;
ldap_pvt_gnutls_session_t *ssl;
if ( HAS_TLS( sb ) ) {
ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
} else {
ssl = alloc_handle( ctx_arg, 1 );
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 = gnutls_handshake( ssl->session );
#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: %s.\n",
gnutls_strerror( err ),0,0 );
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;
}
int
ldap_tls_inplace( LDAP *ld )
{
Sockbuf *sb = NULL;
if ( ld->ld_defconn && ld->ld_defconn->lconn_sb ) {
sb = ld->ld_defconn->lconn_sb;
} else if ( ld->ld_sb ) {
sb = ld->ld_sb;
} else {
return 0;
}
return ldap_pvt_tls_inplace( sb );
}
static void
x509_cert_get_dn( struct berval *cert, struct berval *dn, int get_subject )
{
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
ber_tag_t tag;
ber_len_t len;
ber_int_t i;
ber_init2( ber, cert, LBER_USE_DER );
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Context + Constructed (version) */
if ( tag == 0xa0 ) /* Version is optional */
tag = ber_get_int( ber, &i ); /* Int: Version */
tag = ber_get_int( ber, &i ); /* Int: Serial */
tag = ber_skip_tag( ber, &len ); /* Sequence: Signature */
ber_skip_data( ber, len );
if ( !get_subject ) {
tag = ber_peek_tag( ber, &len ); /* Sequence: Issuer DN */
} else {
tag = ber_skip_tag( ber, &len );
ber_skip_data( ber, len );
tag = ber_skip_tag( ber, &len ); /* Sequence: Validity */
ber_skip_data( ber, len );
tag = ber_peek_tag( ber, &len ); /* Sequence: Subject DN */
}
len = ber_ptrlen( ber );
dn->bv_val = cert->bv_val + len;
dn->bv_len = cert->bv_len - len;
}
static int
tls_get_cert_dn( ldap_pvt_gnutls_session_t *session )
{
if ( !session->peer_der_dn.bv_val ) {
const gnutls_datum_t *peer_cert_list;
int list_size;
struct berval bv;
peer_cert_list = gnutls_certificate_get_peers( session->session,
&list_size );
if ( !peer_cert_list ) return LDAP_INVALID_CREDENTIALS;
bv.bv_len = peer_cert_list->size;
bv.bv_val = peer_cert_list->data;
x509_cert_get_dn( &bv, &session->peer_der_dn, 1 );
}
return 0;
}
int
ldap_pvt_tls_get_peer_dn( void *s, struct berval *dn,
LDAPDN_rewrite_dummy *func, unsigned flags )
{
ldap_pvt_gnutls_session_t *session = s;
int rc;
rc = tls_get_cert_dn( session );
if ( rc ) return rc;
rc = ldap_X509dn2bv( &session->peer_der_dn, dn,
(LDAPDN_rewrite_func *)func, flags);
return rc;
}
/* what kind of hostname were we given? */
#define IS_DNS 0
#define IS_IP4 1
#define IS_IP6 2
int
ldap_pvt_tls_check_hostname( LDAP *ld, void *s, const char *name_in )
{
ldap_pvt_gnutls_session_t *session = s;
int i, ret;
const gnutls_datum_t *peer_cert_list;
int list_size;
struct berval bv;
char altname[NI_MAXHOST];
size_t altnamesize;
gnutls_x509_crt_t cert;
gnutls_datum_t *x;
const char *name;
char *ptr;
char *domain = NULL;
#ifdef LDAP_PF_INET6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
int n, len1 = 0, len2 = 0;
int ntype = IS_DNS;
if( ldap_int_hostname &&
( !name_in || !strcasecmp( name_in, "localhost" ) ) )
{
name = ldap_int_hostname;
} else {
name = name_in;
}
peer_cert_list = gnutls_certificate_get_peers( session->session,
&list_size );
if ( !peer_cert_list ) {
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get peer certificate.\n",
0, 0, 0 );
/* If this was a fatal condition, things would have
* aborted long before now.
*/
return LDAP_SUCCESS;
}
ret = gnutls_x509_crt_init( &cert );
if ( ret < 0 )
return LDAP_LOCAL_ERROR;
ret = gnutls_x509_crt_import( cert, peer_cert_list, GNUTLS_X509_FMT_DER );
if ( ret ) {
gnutls_x509_crt_deinit( cert );
return LDAP_LOCAL_ERROR;
}
#ifdef LDAP_PF_INET6
if (name[0] == '[' && strchr(name, ']')) {
char *n2 = ldap_strdup(name+1);
*strchr(n2, ']') = 2;
if (inet_pton(AF_INET6, n2, &addr))
ntype = IS_IP6;
LDAP_FREE(n2);
} else
#endif
if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
}
if (ntype == IS_DNS) {
len1 = strlen(name);
domain = strchr(name, '.');
if (domain) {
len2 = len1 - (domain-name);
}
}
for ( i=0, ret=0; ret >= 0; i++ ) {
altnamesize = sizeof(altname);
ret = gnutls_x509_crt_get_subject_alt_name( cert, i,
altname, &altnamesize, NULL );
if ( ret < 0 ) break;
/* ignore empty */
if ( altnamesize == 0 ) continue;
if ( ret == GNUTLS_SAN_DNSNAME ) {
if (ntype != IS_DNS) continue;
/* Is this an exact match? */
if ((len1 == altnamesize) && !strncasecmp(name, altname, len1)) {
break;
}
/* Is this a wildcard match? */
if (domain && (altname[0] == '*') && (altname[1] == '.') &&
(len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2))
{
break;
}
} else if ( ret == GNUTLS_SAN_IPADDRESS ) {
if (ntype == IS_DNS) continue;
#ifdef LDAP_PF_INET6
if (ntype == IS_IP6 && altnamesize != sizeof(struct in6_addr)) {
continue;
} else
#endif
if (ntype == IS_IP4 && altnamesize != sizeof(struct in_addr)) {
continue;
}
if (!memcmp(altname, &addr, altnamesize)) {
break;
}
}
}
if ( ret >= 0 ) {
ret = LDAP_SUCCESS;
} else {
altnamesize = sizeof(altname);
ret = gnutls_x509_crt_get_dn_by_oid( cert, CN_OID,
0, 0, altname, &altnamesize );
if ( ret < 0 ) {
Debug( LDAP_DEBUG_ANY,
"TLS: unable to get common name from peer certificate.\n",
0, 0, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: unable to get CN from peer certificate"));
} else {
ret = LDAP_LOCAL_ERROR;
if ( len1 == altnamesize && strncasecmp(name, altname, altnamesize) == 0 ) {
ret = LDAP_SUCCESS;
} else if (( altname[0] == '*' ) && ( altname[1] == '.' )) {
/* Is this a wildcard match? */
if( domain &&
(len2 == altnamesize-1) && !strncasecmp(domain, &altname[1], len2)) {
ret = LDAP_SUCCESS;
}
}
}
if( ret == LDAP_LOCAL_ERROR ) {
altname[altnamesize] = '\0';
Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
"common name in certificate (%s).\n",
name, altname, 0 );
ret = LDAP_CONNECT_ERROR;
if ( ld->ld_error ) {
LDAP_FREE( ld->ld_error );
}
ld->ld_error = LDAP_STRDUP(
_("TLS: hostname does not match CN in peer certificate"));
}
}
gnutls_x509_crt_deinit( cert );
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 */
gnutls_datum_t *x;
gnutls_x509_dn *xn;
char buf[2048], *p;
x = SSL_get_peer_certificate((ldap_pvt_gnutls_session_t *)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:
case LDAP_OPT_X_TLS_CIPHER_SUITE:
case LDAP_OPT_X_TLS_DHFILE:
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:
*(void **)arg = lo->ldo_tls_ctx;
if ( lo->ldo_tls_ctx ) {
ldap_pvt_tls_ctx_ref( lo->ldo_tls_ctx );
}
break;
case LDAP_OPT_X_TLS_CACERTFILE:
*(char **)arg = lo->ldo_tls_cacertfile ?
LDAP_STRDUP( lo->ldo_tls_cacertfile ) : NULL;
break;
case LDAP_OPT_X_TLS_CACERTDIR:
*(char **)arg = lo->ldo_tls_cacertdir ?
LDAP_STRDUP( lo->ldo_tls_cacertdir ) : NULL;
break;
case LDAP_OPT_X_TLS_CERTFILE:
*(char **)arg = lo->ldo_tls_certfile ?
LDAP_STRDUP( lo->ldo_tls_certfile ) : NULL;
break;
case LDAP_OPT_X_TLS_KEYFILE:
*(char **)arg = lo->ldo_tls_keyfile ?
LDAP_STRDUP( lo->ldo_tls_keyfile ) : NULL;
break;
case LDAP_OPT_X_TLS_DHFILE:
*(char **)arg = lo->ldo_tls_dhfile ?
LDAP_STRDUP( lo->ldo_tls_dhfile ) : NULL;
break;
case LDAP_OPT_X_TLS_REQUIRE_CERT:
*(int *)arg = lo->ldo_tls_require_cert;
break;
#ifdef HAVE_OPENSSL_CRL
case LDAP_OPT_X_TLS_CRLCHECK:
*(int *)arg = lo->ldo_tls_crlcheck;
break;
#endif
case LDAP_OPT_X_TLS_CIPHER_SUITE:
*(char **)arg = lo->ldo_tls_ciphersuite ?
LDAP_STRDUP( lo->ldo_tls_ciphersuite ) : NULL;
break;
case LDAP_OPT_X_TLS_RANDOM_FILE:
*(char **)arg = 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;
}
case LDAP_OPT_X_TLS_CONNECT_CB:
*(LDAP_TLS_CONNECT_CB **)arg = lo->ldo_tls_connect_cb;
break;
case LDAP_OPT_X_TLS_CONNECT_ARG:
*(void **)arg = lo->ldo_tls_connect_arg;
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:
if ( !arg ) return -1;
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 ( lo->ldo_tls_ctx )
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = arg;
ldap_pvt_tls_ctx_ref( lo->ldo_tls_ctx );
return 0;
case LDAP_OPT_X_TLS_CONNECT_CB:
lo->ldo_tls_connect_cb = (LDAP_TLS_CONNECT_CB *)arg;
return 0;
case LDAP_OPT_X_TLS_CONNECT_ARG:
lo->ldo_tls_connect_arg = arg;
return 0;
case LDAP_OPT_X_TLS_CACERTFILE:
if ( lo->ldo_tls_cacertfile ) LDAP_FREE( lo->ldo_tls_cacertfile );
lo->ldo_tls_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_CACERTDIR:
if ( lo->ldo_tls_cacertdir ) LDAP_FREE( lo->ldo_tls_cacertdir );
lo->ldo_tls_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_CERTFILE:
if ( lo->ldo_tls_certfile ) LDAP_FREE( lo->ldo_tls_certfile );
lo->ldo_tls_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_KEYFILE:
if ( lo->ldo_tls_keyfile ) LDAP_FREE( lo->ldo_tls_keyfile );
lo->ldo_tls_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_DHFILE:
if ( lo->ldo_tls_dhfile ) LDAP_FREE( lo->ldo_tls_dhfile );
lo->ldo_tls_dhfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_REQUIRE_CERT:
if ( !arg ) return -1;
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:
lo->ldo_tls_require_cert = * (int *) arg;
return 0;
}
return -1;
#ifdef HAVE_OPENSSL_CRL
case LDAP_OPT_X_TLS_CRLCHECK:
if ( !arg ) return -1;
switch( *(int *) arg ) {
case LDAP_OPT_X_TLS_CRL_NONE:
case LDAP_OPT_X_TLS_CRL_PEER:
case LDAP_OPT_X_TLS_CRL_ALL:
lo->ldo_tls_crlcheck = * (int *) arg;
return 0;
}
return -1;
#endif
case LDAP_OPT_X_TLS_CIPHER_SUITE:
if ( lo->ldo_tls_ciphersuite ) LDAP_FREE( lo->ldo_tls_ciphersuite );
lo->ldo_tls_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
return 0;
case LDAP_OPT_X_TLS_RANDOM_FILE:
return 0;
break;
case LDAP_OPT_X_TLS_NEWCTX:
if ( !arg ) return -1;
if ( lo->ldo_tls_ctx )
ldap_pvt_tls_ctx_free( lo->ldo_tls_ctx );
lo->ldo_tls_ctx = NULL;
return ldap_int_tls_init_ctx( lo, *(int *)arg );
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
*/
if (ld->ld_options.ldo_tls_require_cert != LDAP_OPT_X_TLS_NEVER) {
ld->ld_errno = ldap_pvt_tls_check_hostname( ld, ssl, host );
if (ld->ld_errno != LDAP_SUCCESS) {
return ld->ld_errno;
}
}
return LDAP_SUCCESS;
}
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 )
{
ldap_pvt_gnutls_session_t *session = s;
gnutls_cipher_algorithm_t c;
c = gnutls_cipher_get( session->session );
return gnutls_cipher_get_key_size( c );
}
int
ldap_pvt_tls_get_my_dn( void *s, struct berval *dn, LDAPDN_rewrite_dummy *func, unsigned flags )
{
ldap_pvt_gnutls_session_t *session = s;
const gnutls_datum_t *x;
struct berval bv, der_dn;
int rc;
x = gnutls_certificate_get_ours( session->session );
if (!x) return LDAP_INVALID_CREDENTIALS;
bv.bv_val = x->data;
bv.bv_len = x->size;
x509_cert_get_dn( &bv, &der_dn, 1 );
rc = ldap_X509dn2bv(&der_dn, dn, (LDAPDN_rewrite_func *)func, flags );
return rc;
}
int
ldap_start_tls( LDAP *ld,
LDAPControl **serverctrls,
LDAPControl **clientctrls,
int *msgidp )
{
return ldap_extended_operation( ld, LDAP_EXOP_START_TLS,
NULL, serverctrls, clientctrls, msgidp );
}
int
ldap_install_tls( LDAP *ld )
{
#ifndef HAVE_TLS
return LDAP_NOT_SUPPORTED;
#else
if ( ldap_tls_inplace( ld ) ) {
return LDAP_LOCAL_ERROR;
}
return ldap_int_tls_start( ld, ld->ld_defconn, NULL );
#endif
}
int
ldap_start_tls_s ( LDAP *ld,
LDAPControl **serverctrls,
LDAPControl **clientctrls )
{
#ifndef HAVE_TLS
return LDAP_NOT_SUPPORTED;
#else
int rc;
char *rspoid = NULL;
struct berval *rspdata = NULL;
/* XXYYZ: this initiates operation only on default connection! */
if ( ldap_tls_inplace( ld ) ) {
return LDAP_LOCAL_ERROR;
}
rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
NULL, serverctrls, clientctrls, &rspoid, &rspdata );
if ( rspoid != NULL ) {
LDAP_FREE(rspoid);
}
if ( rspdata != NULL ) {
ber_bvfree( rspdata );
}
if ( rc == LDAP_SUCCESS ) {
rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL );
}
return rc;
#endif
}
/* These tags probably all belong in lber.h, but they're
* not normally encountered when processing LDAP, so maybe
* they belong somewhere else instead.
*/
#define LBER_TAG_OID ((ber_tag_t) 0x06UL)
/* Tags for string types used in a DirectoryString.
*
* Note that IA5string is not one of the defined choices for
* DirectoryString in X.520, but it gets used for email AVAs.
*/
#define LBER_TAG_UTF8 ((ber_tag_t) 0x0cUL)
#define LBER_TAG_PRINTABLE ((ber_tag_t) 0x13UL)
#define LBER_TAG_TELETEX ((ber_tag_t) 0x14UL)
#define LBER_TAG_IA5 ((ber_tag_t) 0x16UL)
#define LBER_TAG_UNIVERSAL ((ber_tag_t) 0x1cUL)
#define LBER_TAG_BMP ((ber_tag_t) 0x1eUL)
static oid_name *
find_oid( struct berval *oid )
{
int i;
for ( i=0; !BER_BVISNULL( &oids[i].oid ); i++ ) {
if ( oids[i].oid.bv_len != oid->bv_len ) continue;
if ( !strcmp( oids[i].oid.bv_val, oid->bv_val ))
return &oids[i];
}
return NULL;
}
/* Convert a structured DN from an X.509 certificate into an LDAPV3 DN.
* x509_name must be raw DER. If func is non-NULL, the
* constructed DN will use numeric OIDs to identify attributeTypes,
* and the func() will be invoked to rewrite the DN with the given
* flags.
*
* Otherwise the DN will use shortNames from a hardcoded table.
*/
int
ldap_X509dn2bv( void *x509_name, struct berval *bv, LDAPDN_rewrite_func *func,
unsigned flags )
{
LDAPDN newDN;
LDAPRDN newRDN;
LDAPAVA *newAVA, *baseAVA;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
char oids[8192], *oidptr = oids, *oidbuf = NULL;
void *ptrs[2048];
char *dn_end, *rdn_end;
int i, navas, nrdns, rc = LDAP_SUCCESS;
size_t dnsize, oidrem = sizeof(oids), oidsize = 0;
int csize;
ber_tag_t tag;
ber_len_t len;
oid_name *oidname;
struct berval Oid, Val, oid2, *in = x509_name;
assert( bv != NULL );
bv->bv_len = 0;
bv->bv_val = NULL;
navas = 0;
nrdns = 0;
/* A DN is a SEQUENCE of RDNs. An RDN is a SET of AVAs.
* An AVA is a SEQUENCE of attr and value.
* Count the number of AVAs and RDNs
*/
ber_init2( ber, in, LBER_USE_DER );
tag = ber_peek_tag( ber, &len );
if ( tag != LBER_SEQUENCE )
return LDAP_DECODING_ERROR;
for ( tag = ber_first_element( ber, &len, &dn_end );
tag == LBER_SET;
tag = ber_next_element( ber, &len, dn_end )) {
nrdns++;
for ( tag = ber_first_element( ber, &len, &rdn_end );
tag == LBER_SEQUENCE;
tag = ber_next_element( ber, &len, rdn_end )) {
tag = ber_skip_tag( ber, &len );
ber_skip_data( ber, len );
navas++;
}
}
/* Allocate the DN/RDN/AVA stuff as a single block */
dnsize = sizeof(LDAPRDN) * (nrdns+1);
dnsize += sizeof(LDAPAVA *) * (navas+nrdns);
dnsize += sizeof(LDAPAVA) * navas;
if (dnsize > sizeof(ptrs)) {
newDN = (LDAPDN)LDAP_MALLOC( dnsize );
if ( newDN == NULL )
return LDAP_NO_MEMORY;
} else {
newDN = (LDAPDN)(char *)ptrs;
}
newDN[nrdns] = NULL;
newRDN = (LDAPRDN)(newDN + nrdns+1);
newAVA = (LDAPAVA *)(newRDN + navas + nrdns);
baseAVA = newAVA;
/* Rewind and start extracting */
ber_rewind( ber );
tag = ber_first_element( ber, &len, &dn_end );
for ( i = nrdns - 1; i >= 0; i-- ) {
newDN[i] = newRDN;
for ( tag = ber_first_element( ber, &len, &rdn_end );
tag == LBER_SEQUENCE;
tag = ber_next_element( ber, &len, rdn_end )) {
*newRDN++ = newAVA;
tag = ber_skip_tag( ber, &len );
tag = ber_get_stringbv( ber, &Oid, 0 );
if ( tag != LBER_TAG_OID ) {
rc = LDAP_DECODING_ERROR;
goto nomem;
}
oid2.bv_val = oidptr;
oid2.bv_len = oidrem;
ber_decode_oid( &Oid, &oid2 );
oidname = find_oid( &oid2 );
if ( !oidname ) {
newAVA->la_attr = oid2;
oidptr += oid2.bv_len + 1;
oidrem -= oid2.bv_len + 1;
/* Running out of OID buffer space? */
if (oidrem < 128) {
if ( oidsize == 0 ) {
oidsize = sizeof(oids) * 2;
oidrem = oidsize;
oidbuf = LDAP_MALLOC( oidsize );
if ( oidbuf == NULL ) goto nomem;
oidptr = oidbuf;
} else {
char *old = oidbuf;
oidbuf = LDAP_REALLOC( oidbuf, oidsize*2 );
if ( oidbuf == NULL ) goto nomem;
/* Buffer moved! Fix AVA pointers */
if ( old != oidbuf ) {
LDAPAVA *a;
long dif = oidbuf - old;
for (a=baseAVA; a<=newAVA; a++){
if (a->la_attr.bv_val >= old &&
a->la_attr.bv_val <= (old + oidsize))
a->la_attr.bv_val += dif;
}
}
oidptr = oidbuf + oidsize - oidrem;
oidrem += oidsize;
oidsize *= 2;
}
}
} else {
if ( func ) {
newAVA->la_attr = oidname->oid;
} else {
newAVA->la_attr = oidname->name;
}
}
tag = ber_get_stringbv( ber, &Val, 0 );
switch(tag) {
case LBER_TAG_UNIVERSAL:
/* This uses 32-bit ISO 10646-1 */
csize = 4; goto to_utf8;
case LBER_TAG_BMP:
/* This uses 16-bit ISO 10646-1 */
csize = 2; goto to_utf8;
case LBER_TAG_TELETEX:
/* This uses 8-bit, assume ISO 8859-1 */
csize = 1;
to_utf8: rc = ldap_ucs_to_utf8s( &Val, csize, &newAVA->la_value );
newAVA->la_flags |= LDAP_AVA_FREE_VALUE;
if (rc != LDAP_SUCCESS) goto nomem;
newAVA->la_flags = LDAP_AVA_NONPRINTABLE;
break;
case LBER_TAG_UTF8:
newAVA->la_flags = LDAP_AVA_NONPRINTABLE;
/* This is already in UTF-8 encoding */
case LBER_TAG_IA5:
case LBER_TAG_PRINTABLE:
/* These are always 7-bit strings */
newAVA->la_value = Val;
default:
;
}
newAVA->la_private = NULL;
newAVA->la_flags = LDAP_AVA_STRING;
newAVA++;
}
*newRDN++ = NULL;
tag = ber_next_element( ber, &len, dn_end );
}
if ( func ) {
rc = func( newDN, flags, NULL );
if ( rc != LDAP_SUCCESS )
goto nomem;
}
rc = ldap_dn2bv_x( newDN, bv, LDAP_DN_FORMAT_LDAPV3, NULL );
nomem:
for (;baseAVA < newAVA; baseAVA++) {
if (baseAVA->la_flags & LDAP_AVA_FREE_ATTR)
LDAP_FREE( baseAVA->la_attr.bv_val );
if (baseAVA->la_flags & LDAP_AVA_FREE_VALUE)
LDAP_FREE( baseAVA->la_value.bv_val );
}
if ( oidsize != 0 )
LDAP_FREE( oidbuf );
if ( newDN != (LDAPDN)(char *) ptrs )
LDAP_FREE( newDN );
return rc;
}
#if 0
/* test driver - feed in a DER cert on stdin */
main( int argc, char *argv ) {
char buf[8192];
struct berval bv, bv2, dn;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
ber_tag_t tag;
ber_len_t len;
bv.bv_len = fread(buf, 1, sizeof(buf), stdin);
bv.bv_val = buf;
ber_init2( ber, &bv, LBER_USE_DER );
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Sequence */
tag = ber_skip_tag( ber, &len ); /* Context + Constructed (version) */
if ( tag == 0xa0 ) /* Version is optional */
tag = ber_get_int( ber, &len ); /* Int: Version */
tag = ber_get_int( ber, &len ); /* Int: Serial */
tag = ber_skip_tag( ber, &len ); /* Sequence: Signature */
tag = ber_skip_tag( ber, &len ); /* : Signature */
ber_skip_data( ber, len );
tag = ber_skip_tag( ber, &len ); /* : Signature */
ber_skip_data( ber, len );
tag = ber_peek_tag( ber, &len ); /* Sequence: Issuer DN */
len = ber_ptrlen( ber );
bv2.bv_val = bv.bv_val + len;
bv2.bv_len = bv.bv_len - len;
X509dn2bv( &bv2, &dn, NULL, 0 );
printf( "Issuer: %s\n", dn.bv_val );
}
#endif
#endif /* HAVE_GNUTLS */
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