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/*
* Copyright (C) 2004 Red Hat Inc.
* Copyright (C) 2005 Martin Koegler
* Copyright (C) 2010 TigerVNC Team
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef HAVE_GNUTLS
#error "This source should not be compiled without HAVE_GNUTLS defined"
#endif
#include <rfb/SSecurityTLSBase.h>
#include <rfb/SConnection.h>
#include <rfb/LogWriter.h>
#include <rfb/Exception.h>
#include <rdr/TLSInStream.h>
#include <rdr/TLSOutStream.h>
#define TLS_DEBUG
using namespace rfb;
static LogWriter vlog("TLS");
#ifdef TLS_DEBUG
static void debug_log(int level, const char* str)
{
vlog.debug(str);
}
#endif
void SSecurityTLSBase::initGlobal()
{
static bool globalInitDone = false;
if (!globalInitDone) {
if (gnutls_global_init() != GNUTLS_E_SUCCESS)
throw AuthFailureException("gnutls_global_init failed");
#ifdef TLS_DEBUG
gnutls_global_set_log_level(10);
gnutls_global_set_log_function(debug_log);
#endif
globalInitDone = true;
}
}
SSecurityTLSBase::SSecurityTLSBase() : session(0)
{
fis=0;
fos=0;
}
void SSecurityTLSBase::shutdown()
{
if(session)
;//gnutls_bye(session, GNUTLS_SHUT_RDWR);
}
SSecurityTLSBase::~SSecurityTLSBase()
{
if (session) {
//gnutls_bye(session, GNUTLS_SHUT_RDWR);
gnutls_deinit(session);
}
if(fis)
delete fis;
if(fos)
delete fos;
/* FIXME: should be doing gnutls_global_deinit() at some point */
}
bool SSecurityTLSBase::processMsg(SConnection *sc)
{
rdr::InStream* is = sc->getInStream();
rdr::OutStream* os = sc->getOutStream();
vlog.debug("Process security message (session %p)", session);
if (!session) {
initGlobal();
if (gnutls_init(&session, GNUTLS_SERVER) != GNUTLS_E_SUCCESS)
throw AuthFailureException("gnutls_init failed");
if (gnutls_set_default_priority(session) != GNUTLS_E_SUCCESS)
throw AuthFailureException("gnutls_set_default_priority failed");
try {
setParams(session);
}
catch(...) {
os->writeU8(0);
throw;
}
gnutls_transport_set_pull_function(session,rdr::gnutls_InStream_pull);
gnutls_transport_set_push_function(session,rdr::gnutls_OutStream_push);
gnutls_transport_set_ptr2(session,
(gnutls_transport_ptr)is,
(gnutls_transport_ptr)os);
os->writeU8(1);
os->flush();
}
int err;
if ((err = gnutls_handshake(session)) != GNUTLS_E_SUCCESS) {
if (!gnutls_error_is_fatal(err)) {
vlog.debug("Deferring completion of TLS handshake: %s", gnutls_strerror(err));
return false;
}
vlog.error("TLS Handshake failed: %s", gnutls_strerror (err));
gnutls_bye(session, GNUTLS_SHUT_RDWR);
freeResources();
gnutls_deinit(session);
session = 0;
throw AuthFailureException("TLS Handshake failed");
}
vlog.debug("Handshake completed");
sc->setStreams(fis=new rdr::TLSInStream(is,session),
fos=new rdr::TLSOutStream(os,session));
return true;
}
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