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- /*
- * Copyright (C) 2004 Red Hat Inc.
- * Copyright (C) 2005 Martin Koegler
- * Copyright (C) 2010 TigerVNC Team
- * Copyright (C) 2012-2021 Pierre Ossman for Cendio AB
- *
- * 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 <stdlib.h>
-
- #include <rfb/SSecurityTLS.h>
- #include <rfb/SConnection.h>
- #include <rfb/LogWriter.h>
- #include <rfb/Exception.h>
- #include <rdr/TLSInStream.h>
- #include <rdr/TLSOutStream.h>
- #include <gnutls/x509.h>
-
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- /* FFDHE (RFC-7919) 2048-bit parameters, PEM-encoded */
- static unsigned char ffdhe2048[] =
- "-----BEGIN DH PARAMETERS-----\n"
- "MIIBDAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz\n"
- "+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a\n"
- "87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7\n"
- "YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi\n"
- "7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD\n"
- "ssbzSibBsu/6iGtCOGEoXJf//////////wIBAgICAOE=\n"
- "-----END DH PARAMETERS-----\n";
-
- static const gnutls_datum_t ffdhe_pkcs3_param = {
- ffdhe2048,
- sizeof(ffdhe2048)
- };
- #endif
-
- using namespace rfb;
-
- StringParameter SSecurityTLS::X509_CertFile
- ("X509Cert", "Path to the X509 certificate in PEM format", "", ConfServer);
-
- StringParameter SSecurityTLS::X509_KeyFile
- ("X509Key", "Path to the key of the X509 certificate in PEM format", "", ConfServer);
-
- static LogWriter vlog("TLS");
-
- SSecurityTLS::SSecurityTLS(SConnection* sc, bool _anon)
- : SSecurity(sc), session(NULL), anon_cred(NULL),
- cert_cred(NULL), anon(_anon), tlsis(NULL), tlsos(NULL),
- rawis(NULL), rawos(NULL)
- {
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- dh_params = NULL;
- #endif
-
- certfile = X509_CertFile.getData();
- keyfile = X509_KeyFile.getData();
-
- if (gnutls_global_init() != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_global_init failed");
- }
-
- void SSecurityTLS::shutdown()
- {
- if (session) {
- int ret;
- // FIXME: We can't currently wait for the response, so we only send
- // our close and hope for the best
- ret = gnutls_bye(session, GNUTLS_SHUT_WR);
- if ((ret != GNUTLS_E_SUCCESS) && (ret != GNUTLS_E_INVALID_SESSION))
- vlog.error("TLS shutdown failed: %s", gnutls_strerror(ret));
- }
-
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- if (dh_params) {
- gnutls_dh_params_deinit(dh_params);
- dh_params = 0;
- }
- #endif
-
- 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 (rawis && rawos) {
- sc->setStreams(rawis, rawos);
- rawis = NULL;
- rawos = NULL;
- }
-
- if (tlsis) {
- delete tlsis;
- tlsis = NULL;
- }
- if (tlsos) {
- delete tlsos;
- tlsos = NULL;
- }
-
- if (session) {
- gnutls_deinit(session);
- session = 0;
- }
- }
-
-
- SSecurityTLS::~SSecurityTLS()
- {
- shutdown();
-
- delete[] keyfile;
- delete[] certfile;
-
- gnutls_global_deinit();
- }
-
- bool SSecurityTLS::processMsg()
- {
- vlog.debug("Process security message (session %p)", session);
-
- if (!session) {
- rdr::InStream* is = sc->getInStream();
- rdr::OutStream* os = sc->getOutStream();
-
- 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;
- }
-
- os->writeU8(1);
- os->flush();
-
- // Create these early as they set up the push/pull functions
- // for GnuTLS
- tlsis = new rdr::TLSInStream(is, session);
- tlsos = new rdr::TLSOutStream(os, session);
-
- rawis = is;
- rawos = os;
- }
-
- int err;
- err = gnutls_handshake(session);
- if (err != 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("TLS handshake completed with %s",
- gnutls_session_get_desc(session));
-
- sc->setStreams(tlsis, tlsos);
-
- return true;
- }
-
- void SSecurityTLS::setParams(gnutls_session_t session)
- {
- static const char kx_anon_priority[] = ":+ANON-ECDH:+ANON-DH";
-
- int ret;
-
- // Custom priority string specified?
- if (strcmp(Security::GnuTLSPriority, "") != 0) {
- char *prio;
- const char *err;
-
- prio = (char*)malloc(strlen(Security::GnuTLSPriority) +
- strlen(kx_anon_priority) + 1);
- if (prio == NULL)
- throw AuthFailureException("Not enough memory for GnuTLS priority string");
-
- strcpy(prio, Security::GnuTLSPriority);
- if (anon)
- strcat(prio, kx_anon_priority);
-
- ret = gnutls_priority_set_direct(session, prio, &err);
-
- free(prio);
-
- if (ret != GNUTLS_E_SUCCESS) {
- if (ret == GNUTLS_E_INVALID_REQUEST)
- vlog.error("GnuTLS priority syntax error at: %s", err);
- throw AuthFailureException("gnutls_set_priority_direct failed");
- }
- } else if (anon) {
- const char *err;
-
- #if GNUTLS_VERSION_NUMBER >= 0x030603
- // gnutls_set_default_priority_appends() expects a normal priority string that
- // doesn't start with ":".
- ret = gnutls_set_default_priority_append(session, kx_anon_priority + 1, &err, 0);
- if (ret != GNUTLS_E_SUCCESS) {
- if (ret == GNUTLS_E_INVALID_REQUEST)
- vlog.error("GnuTLS priority syntax error at: %s", err);
- throw AuthFailureException("gnutls_set_default_priority_append failed");
- }
- #else
- // We don't know what the system default priority is, so we guess
- // it's what upstream GnuTLS has
- static const char gnutls_default_priority[] = "NORMAL";
- char *prio;
-
- prio = (char*)malloc(strlen(gnutls_default_priority) +
- strlen(kx_anon_priority) + 1);
- if (prio == NULL)
- throw AuthFailureException("Not enough memory for GnuTLS priority string");
-
- strcpy(prio, gnutls_default_priority);
- strcat(prio, kx_anon_priority);
-
- ret = gnutls_priority_set_direct(session, prio, &err);
-
- free(prio);
-
- if (ret != GNUTLS_E_SUCCESS) {
- if (ret == GNUTLS_E_INVALID_REQUEST)
- vlog.error("GnuTLS priority syntax error at: %s", err);
- throw AuthFailureException("gnutls_set_priority_direct failed");
- }
- #endif
- }
-
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- if (gnutls_dh_params_init(&dh_params) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_dh_params_init failed");
-
- if (gnutls_dh_params_import_pkcs3(dh_params, &ffdhe_pkcs3_param, GNUTLS_X509_FMT_PEM) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_dh_params_import_pkcs3 failed");
- #endif
-
- if (anon) {
- if (gnutls_anon_allocate_server_credentials(&anon_cred) != GNUTLS_E_SUCCESS)
- throw AuthFailureException("gnutls_anon_allocate_server_credentials failed");
-
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- gnutls_anon_set_server_dh_params(anon_cred, dh_params);
- #endif
-
- 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");
-
- #if defined (SSECURITYTLS__USE_DEPRECATED_DH)
- gnutls_certificate_set_dh_params(cert_cred, dh_params);
- #endif
-
- switch (gnutls_certificate_set_x509_key_file(cert_cred, certfile, keyfile, GNUTLS_X509_FMT_PEM)) {
- case GNUTLS_E_SUCCESS:
- break;
- case GNUTLS_E_CERTIFICATE_KEY_MISMATCH:
- throw AuthFailureException("Private key does not match certificate");
- case GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE:
- throw AuthFailureException("Unsupported certificate type");
- default:
- throw AuthFailureException("Error loading X509 certificate or key");
- }
-
- 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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