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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/SSecurityTLS.h>
- #include <rfb/SConnection.h>
- #include <rfb/LogWriter.h>
- #include <rfb/Exception.h>
- #include <rdr/TLSInStream.h>
- #include <rdr/TLSOutStream.h>
-
- #define DH_BITS 1024 /* XXX This should be configurable! */
-
- using namespace rfb;
-
- StringParameter SSecurityTLS::X509_CertFile
- ("x509cert", "specifies path to the x509 certificate in PEM format", "", ConfServer);
-
- StringParameter SSecurityTLS::X509_KeyFile
- ("x509key", "specifies path to the key of the x509 certificate in PEM format", "", ConfServer);
-
- static LogWriter vlog("TLS");
- static LogWriter vlog_raw("RawTLS");
-
- static void debug_log(int level, const char* str)
- {
- vlog.debug("[%d]: %s", level, str);
- }
-
- void SSecurityTLS::initGlobal()
- {
- static bool globalInitDone = false;
-
- if (!globalInitDone) {
- if (gnutls_global_init() != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_global_init failed");
-
- /* 100 means debug log */
- if (vlog_raw.getLevel() >= 100) {
- gnutls_global_set_log_level(10);
- gnutls_global_set_log_function(debug_log);
- }
-
- globalInitDone = true;
- }
- }
-
- SSecurityTLS::SSecurityTLS(bool _anon) : session(0), dh_params(0),
- anon_cred(0), cert_cred(0),
- anon(_anon), fis(0), fos(0)
- {
- certfile = X509_CertFile.getData();
- keyfile = X509_KeyFile.getData();
- }
-
- void SSecurityTLS::shutdown()
- {
- if (session) {
- if (gnutls_bye(session, GNUTLS_SHUT_RDWR) != GNUTLS_E_SUCCESS) {
- /* FIXME: Treat as non-fatal error */
- vlog.error("TLS session wasn't terminated gracefully");
- }
- }
-
- if (dh_params) {
- gnutls_dh_params_deinit(dh_params);
- dh_params = 0;
- }
-
- if (anon_cred) {
- gnutls_anon_free_server_credentials(anon_cred);
- anon_cred = 0;
- }
-
- if (cert_cred) {
- gnutls_certificate_free_credentials(cert_cred);
- cert_cred = 0;
- }
-
- if (session) {
- gnutls_deinit(session);
- session = 0;
-
- gnutls_global_deinit();
- }
- }
-
-
- SSecurityTLS::~SSecurityTLS()
- {
- shutdown();
-
- if (fis)
- delete fis;
- if (fos)
- delete fos;
-
- delete[] keyfile;
- delete[] certfile;
- }
-
- bool SSecurityTLS::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));
- shutdown();
- 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;
- }
-
- void SSecurityTLS::setParams(gnutls_session session)
- {
- static const int kx_anon_priority[] = { GNUTLS_KX_ANON_DH, 0 };
- static const int kx_priority[] = { GNUTLS_KX_DHE_DSS, GNUTLS_KX_RSA,
- GNUTLS_KX_DHE_RSA, GNUTLS_KX_SRP, 0 };
-
- if (gnutls_kx_set_priority(session, anon ? kx_anon_priority : kx_priority)
- != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_kx_set_priority failed");
-
- if (gnutls_dh_params_init(&dh_params) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_dh_params_init failed");
-
- if (gnutls_dh_params_generate2(dh_params, DH_BITS) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_dh_params_generate2 failed");
-
- if (anon) {
- if (gnutls_anon_allocate_server_credentials(&anon_cred) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_anon_allocate_server_credentials failed");
-
- gnutls_anon_set_server_dh_params(anon_cred, dh_params);
-
- if (gnutls_credentials_set(session, GNUTLS_CRD_ANON, anon_cred)
- != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_credentials_set failed");
-
- vlog.debug("Anonymous session has been set");
-
- } else {
- if (gnutls_certificate_allocate_credentials(&cert_cred) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_certificate_allocate_credentials failed");
-
- gnutls_certificate_set_dh_params(cert_cred, dh_params);
-
- if (gnutls_certificate_set_x509_key_file(cert_cred, certfile, keyfile,
- GNUTLS_X509_FMT_PEM) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("load of key failed");
-
- if (gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, cert_cred)
- != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_credentials_set failed");
-
- vlog.debug("X509 session has been set");
-
- }
-
- }
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