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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_server_session_gnutls.h"
#include <cassert>
#include <iostream>
#include <fstream>
#include <array>
#include <ngtcp2/ngtcp2_crypto_gnutls.h>
#include "tls_server_context_gnutls.h"
#include "server_base.h"
#include "util.h"
// Based on https://github.com/ueno/ngtcp2-gnutls-examples
using namespace ngtcp2;
extern Config config;
TLSServerSession::TLSServerSession() {}
TLSServerSession::~TLSServerSession() {}
namespace {
int client_hello_cb(gnutls_session_t session, unsigned int htype, unsigned when,
unsigned int incoming, const gnutls_datum_t *msg) {
assert(htype == GNUTLS_HANDSHAKE_CLIENT_HELLO);
assert(when == GNUTLS_HOOK_POST);
assert(incoming == 1);
// check if ALPN extension is present and properly selected h3
gnutls_datum_t alpn;
if (auto rv = gnutls_alpn_get_selected_protocol(session, &alpn); rv != 0) {
return rv;
}
// TODO Fix this to properly select ALPN based on app_proto.
// strip the first byte from H3_ALPN_V1
auto h3 = reinterpret_cast<const char *>(&H3_ALPN_V1[1]);
if (static_cast<size_t>(H3_ALPN_V1[0]) != alpn.size ||
!std::equal(alpn.data, alpn.data + alpn.size, h3)) {
return -1;
}
return 0;
}
} // namespace
int TLSServerSession::init(const TLSServerContext &tls_ctx,
HandlerBase *handler) {
if (auto rv =
gnutls_init(&session_, GNUTLS_SERVER | GNUTLS_ENABLE_EARLY_DATA |
GNUTLS_NO_AUTO_SEND_TICKET |
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;
}
auto rv = gnutls_session_ticket_enable_server(
session_, tls_ctx.get_session_ticket_key());
if (rv != 0) {
std::cerr << "gnutls_session_ticket_enable_server failed: "
<< gnutls_strerror(rv) << std::endl;
return -1;
}
gnutls_handshake_set_hook_function(session_, GNUTLS_HANDSHAKE_CLIENT_HELLO,
GNUTLS_HOOK_POST, client_hello_cb);
if (ngtcp2_crypto_gnutls_configure_server_session(session_) != 0) {
std::cerr << "ngtcp2_crypto_gnutls_configure_server_session failed"
<< std::endl;
return -1;
}
gnutls_anti_replay_enable(session_, tls_ctx.get_anti_replay());
gnutls_record_set_max_early_data_size(session_, 0xffffffffu);
gnutls_session_set_ptr(session_, handler->conn_ref());
if (auto rv = gnutls_credentials_set(session_, GNUTLS_CRD_CERTIFICATE,
tls_ctx.get_certificate_credentials());
rv != 0) {
std::cerr << "gnutls_credentials_set failed: " << gnutls_strerror(rv)
<< std::endl;
return -1;
}
// TODO Set all available ALPN based on app_proto.
// 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 |
GNUTLS_ALPN_SERVER_PRECEDENCE);
if (config.verify_client) {
gnutls_certificate_server_set_request(session_, GNUTLS_CERT_REQUIRE);
gnutls_certificate_send_x509_rdn_sequence(session_, 1);
}
return 0;
}
int TLSServerSession::send_session_ticket() {
if (auto rv = gnutls_session_ticket_send(session_, 1, 0); rv != 0) {
std::cerr << "gnutls_session_ticket_send failed: " << gnutls_strerror(rv)
<< std::endl;
return -1;
}
return 0;
}
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