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/*
* ngtcp2
*
* Copyright (c) 2020 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "tls_client_session_gnutls.h"
#include <iostream>
#include <fstream>
#include <array>
#include <ngtcp2/ngtcp2_crypto_gnutls.h>
#include <gnutls/crypto.h>
#include "tls_client_context_gnutls.h"
#include "client_base.h"
#include "template.h"
#include "util.h"
// Based on https://github.com/ueno/ngtcp2-gnutls-examples
extern Config config;
TLSClientSession::TLSClientSession() {}
TLSClientSession::~TLSClientSession() {}
namespace {
int hook_func(gnutls_session_t session, unsigned int htype, unsigned when,
unsigned int incoming, const gnutls_datum_t *msg) {
if (config.session_file && htype == GNUTLS_HANDSHAKE_NEW_SESSION_TICKET) {
gnutls_datum_t data;
if (auto rv = gnutls_session_get_data2(session, &data); rv != 0) {
std::cerr << "gnutls_session_get_data2 failed: " << gnutls_strerror(rv)
<< std::endl;
return rv;
}
auto f = std::ofstream(config.session_file);
if (!f) {
return -1;
}
gnutls_datum_t d;
if (auto rv =
gnutls_pem_base64_encode2("GNUTLS SESSION PARAMETERS", &data, &d);
rv < 0) {
std::cerr << "Could not encode session in " << config.session_file
<< std::endl;
return -1;
}
f.write(reinterpret_cast<const char *>(d.data), d.size);
if (!f) {
std::cerr << "Unable to write TLS session to file" << std::endl;
}
gnutls_free(d.data);
gnutls_free(data.data);
}
return 0;
}
} // namespace
int TLSClientSession::init(bool &early_data_enabled,
const TLSClientContext &tls_ctx,
const char *remote_addr, ClientBase *client,
uint32_t quic_version, AppProtocol app_proto) {
early_data_enabled = false;
if (auto rv =
gnutls_init(&session_, GNUTLS_CLIENT | GNUTLS_ENABLE_EARLY_DATA |
GNUTLS_NO_END_OF_EARLY_DATA);
rv != 0) {
std::cerr << "gnutls_init failed: " << gnutls_strerror(rv) << std::endl;
return -1;
}
std::string priority = "%DISABLE_TLS13_COMPAT_MODE:";
priority += config.ciphers;
priority += ':';
priority += config.groups;
if (auto rv = gnutls_priority_set_direct(session_, priority.c_str(), nullptr);
rv != 0) {
std::cerr << "gnutls_priority_set_direct failed: " << gnutls_strerror(rv)
<< std::endl;
return -1;
}
gnutls_handshake_set_hook_function(session_, GNUTLS_HANDSHAKE_ANY,
GNUTLS_HOOK_POST, hook_func);
if (ngtcp2_crypto_gnutls_configure_client_session(session_) != 0) {
std::cerr << "ngtcp2_crypto_gnutls_configure_client_session failed"
<< std::endl;
return -1;
}
if (config.session_file) {
auto f = std::ifstream(config.session_file);
if (f) {
f.seekg(0, std::ios::end);
auto pos = f.tellg();
std::vector<char> content(pos);
f.seekg(0, std::ios::beg);
f.read(content.data(), pos);
gnutls_datum_t s{
.data = reinterpret_cast<unsigned char *>(content.data()),
.size = static_cast<unsigned int>(content.size()),
};
gnutls_datum_t d;
if (auto rv =
gnutls_pem_base64_decode2("GNUTLS SESSION PARAMETERS", &s, &d);
rv < 0) {
std::cerr << "Could not read session in " << config.session_file
<< std::endl;
return -1;
}
auto d_d = defer(gnutls_free, d.data);
if (auto rv = gnutls_session_set_data(session_, d.data, d.size);
rv != 0) {
std::cerr << "gnutls_session_set_data failed: " << gnutls_strerror(rv)
<< std::endl;
return -1;
}
if (!config.disable_early_data) {
early_data_enabled = true;
}
}
}
gnutls_session_set_ptr(session_, client->conn_ref());
if (auto rv = gnutls_credentials_set(session_, GNUTLS_CRD_CERTIFICATE,
tls_ctx.get_native_handle());
rv != 0) {
std::cerr << "gnutls_credentials_set failed: " << gnutls_strerror(rv)
<< std::endl;
return -1;
}
// strip the first byte from H3_ALPN_V1
gnutls_datum_t alpn{
.data = const_cast<uint8_t *>(&H3_ALPN_V1[1]),
.size = H3_ALPN_V1[0],
};
gnutls_alpn_set_protocols(session_, &alpn, 1, GNUTLS_ALPN_MANDATORY);
if (util::numeric_host(remote_addr)) {
// If remote host is numeric address, just send "localhost" as SNI
// for now.
gnutls_server_name_set(session_, GNUTLS_NAME_DNS, "localhost",
strlen("localhost"));
} else {
gnutls_server_name_set(session_, GNUTLS_NAME_DNS, remote_addr,
strlen(remote_addr));
}
return 0;
}
bool TLSClientSession::get_early_data_accepted() const {
return gnutls_session_get_flags(session_) & GNUTLS_SFLAGS_EARLY_DATA;
}
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