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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_context_wolfssl.h"
#include <iostream>
#include <fstream>
#include <limits>
#include <ngtcp2/ngtcp2_crypto_wolfssl.h>
#include "server_base.h"
#include "template.h"
extern Config config;
TLSServerContext::TLSServerContext() : ssl_ctx_{nullptr} {}
TLSServerContext::~TLSServerContext() {
if (ssl_ctx_) {
wolfSSL_CTX_free(ssl_ctx_);
}
}
WOLFSSL_CTX *TLSServerContext::get_native_handle() const { return ssl_ctx_; }
namespace {
int alpn_select_proto_h3_cb(WOLFSSL *ssl, const unsigned char **out,
unsigned char *outlen, const unsigned char *in,
unsigned int inlen, void *arg) {
auto conn_ref =
static_cast<ngtcp2_crypto_conn_ref *>(wolfSSL_get_app_data(ssl));
auto h = static_cast<HandlerBase *>(conn_ref->user_data);
const uint8_t *alpn;
size_t alpnlen;
// This should be the negotiated version, but we have not set the
// negotiated version when this callback is called.
auto version = ngtcp2_conn_get_client_chosen_version(h->conn());
switch (version) {
case QUIC_VER_DRAFT29:
alpn = H3_ALPN_DRAFT29;
alpnlen = str_size(H3_ALPN_DRAFT29);
break;
case QUIC_VER_DRAFT30:
alpn = H3_ALPN_DRAFT30;
alpnlen = str_size(H3_ALPN_DRAFT30);
break;
case QUIC_VER_DRAFT31:
alpn = H3_ALPN_DRAFT31;
alpnlen = str_size(H3_ALPN_DRAFT31);
break;
case QUIC_VER_DRAFT32:
alpn = H3_ALPN_DRAFT32;
alpnlen = str_size(H3_ALPN_DRAFT32);
break;
case NGTCP2_PROTO_VER_V1:
case NGTCP2_PROTO_VER_V2_DRAFT:
alpn = H3_ALPN_V1;
alpnlen = str_size(H3_ALPN_V1);
break;
default:
if (!config.quiet) {
std::cerr << "Unexpected quic protocol version: " << std::hex << "0x"
<< version << std::dec << std::endl;
}
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
for (auto p = in, end = in + inlen; p + alpnlen <= end; p += *p + 1) {
if (std::equal(alpn, alpn + alpnlen, p)) {
*out = p + 1;
*outlen = *p;
return SSL_TLSEXT_ERR_OK;
}
}
if (!config.quiet) {
std::cerr << "Client did not present ALPN " << &alpn[1] << std::endl;
}
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
} // namespace
namespace {
int alpn_select_proto_hq_cb(WOLFSSL *ssl, const unsigned char **out,
unsigned char *outlen, const unsigned char *in,
unsigned int inlen, void *arg) {
auto conn_ref =
static_cast<ngtcp2_crypto_conn_ref *>(wolfSSL_get_app_data(ssl));
auto h = static_cast<HandlerBase *>(conn_ref->user_data);
const uint8_t *alpn;
size_t alpnlen;
// This should be the negotiated version, but we have not set the
// negotiated version when this callback is called.
auto version = ngtcp2_conn_get_client_chosen_version(h->conn());
switch (version) {
case QUIC_VER_DRAFT29:
alpn = HQ_ALPN_DRAFT29;
alpnlen = str_size(HQ_ALPN_DRAFT29);
break;
case QUIC_VER_DRAFT30:
alpn = HQ_ALPN_DRAFT30;
alpnlen = str_size(HQ_ALPN_DRAFT30);
break;
case QUIC_VER_DRAFT31:
alpn = HQ_ALPN_DRAFT31;
alpnlen = str_size(HQ_ALPN_DRAFT31);
break;
case QUIC_VER_DRAFT32:
alpn = HQ_ALPN_DRAFT32;
alpnlen = str_size(HQ_ALPN_DRAFT32);
break;
case NGTCP2_PROTO_VER_V1:
case NGTCP2_PROTO_VER_V2_DRAFT:
alpn = HQ_ALPN_V1;
alpnlen = str_size(HQ_ALPN_V1);
break;
default:
if (!config.quiet) {
std::cerr << "Unexpected quic protocol version: " << std::hex << "0x"
<< version << std::dec << std::endl;
}
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
for (auto p = in, end = in + inlen; p + alpnlen <= end; p += *p + 1) {
if (std::equal(alpn, alpn + alpnlen, p)) {
*out = p + 1;
*outlen = *p;
return SSL_TLSEXT_ERR_OK;
}
}
if (!config.quiet) {
std::cerr << "Client did not present ALPN " << &alpn[1] << std::endl;
}
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
} // namespace
namespace {
int verify_cb(int preverify_ok, X509_STORE_CTX *ctx) {
// We don't verify the client certificate. Just request it for the
// testing purpose.
return 1;
}
} // namespace
int TLSServerContext::init(const char *private_key_file, const char *cert_file,
AppProtocol app_proto) {
constexpr static unsigned char sid_ctx[] = "ngtcp2 server";
#if defined(DEBUG_WOLFSSL)
if (!config.quiet) {
/*wolfSSL_Debugging_ON();*/
}
#endif
ssl_ctx_ = wolfSSL_CTX_new(wolfTLSv1_3_server_method());
if (!ssl_ctx_) {
std::cerr << "wolfSSL_CTX_new: "
<< wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), nullptr)
<< std::endl;
return -1;
}
if (ngtcp2_crypto_wolfssl_configure_server_context(ssl_ctx_) != 0) {
std::cerr << "ngtcp2_crypto_wolfssl_configure_server_context failed"
<< std::endl;
return -1;
}
#ifdef WOLFSSL_EARLY_DATA
wolfSSL_CTX_set_max_early_data(ssl_ctx_, UINT32_MAX);
#endif
constexpr auto ssl_opts =
(WOLFSSL_OP_ALL & ~WOLFSSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) |
WOLFSSL_OP_SINGLE_ECDH_USE | WOLFSSL_OP_CIPHER_SERVER_PREFERENCE;
wolfSSL_CTX_set_options(ssl_ctx_, ssl_opts);
if (wolfSSL_CTX_set_cipher_list(ssl_ctx_, config.ciphers) != 1) {
std::cerr << "wolfSSL_CTX_set_cipher_list: "
<< ERR_error_string(ERR_get_error(), nullptr) << std::endl;
return -1;
}
if (wolfSSL_CTX_set1_curves_list(ssl_ctx_,
const_cast<char *>(config.groups)) != 1) {
std::cerr << "wolfSSL_CTX_set1_curves_list(" << config.groups << ") failed"
<< std::endl;
return -1;
}
wolfSSL_CTX_set_mode(ssl_ctx_, SSL_MODE_RELEASE_BUFFERS);
switch (app_proto) {
case AppProtocol::H3:
wolfSSL_CTX_set_alpn_select_cb(ssl_ctx_, alpn_select_proto_h3_cb, nullptr);
break;
case AppProtocol::HQ:
wolfSSL_CTX_set_alpn_select_cb(ssl_ctx_, alpn_select_proto_hq_cb, nullptr);
break;
}
wolfSSL_CTX_set_default_verify_paths(ssl_ctx_);
if (wolfSSL_CTX_use_PrivateKey_file(ssl_ctx_, private_key_file,
SSL_FILETYPE_PEM) != 1) {
std::cerr << "wolfSSL_CTX_use_PrivateKey_file: "
<< wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), nullptr)
<< std::endl;
return -1;
}
if (wolfSSL_CTX_use_certificate_chain_file(ssl_ctx_, cert_file) != 1) {
std::cerr << "wolfSSL_CTX_use_certificate_chain_file: "
<< wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), nullptr)
<< std::endl;
return -1;
}
if (wolfSSL_CTX_check_private_key(ssl_ctx_) != 1) {
std::cerr << "wolfSSL_CTX_check_private_key: "
<< wolfSSL_ERR_error_string(wolfSSL_ERR_get_error(), nullptr)
<< std::endl;
return -1;
}
wolfSSL_CTX_set_session_id_context(ssl_ctx_, sid_ctx, sizeof(sid_ctx) - 1);
if (config.verify_client) {
wolfSSL_CTX_set_verify(ssl_ctx_,
WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_CLIENT_ONCE |
WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT,
verify_cb);
}
return 0;
}
extern std::ofstream keylog_file;
#ifdef HAVE_SECRET_CALLBACK
namespace {
void keylog_callback(const WOLFSSL *ssl, const char *line) {
keylog_file.write(line, strlen(line));
keylog_file.put('\n');
keylog_file.flush();
}
} // namespace
#endif
void TLSServerContext::enable_keylog() {
#ifdef HAVE_SECRET_CALLBACK
wolfSSL_CTX_set_keylog_callback(ssl_ctx_, keylog_callback);
#endif
}
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