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// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
/// @file openssl_tls.cc OpenSSL implementation of the TLS API.
#include <config.h>
#ifdef WITH_OPENSSL
#include <asiolink/asio_wrapper.h>
#include <asiolink/crypto_tls.h>
#include <sys/stat.h>
#include <openssl/opensslv.h>
using namespace boost::asio;
using namespace boost::asio::ssl;
using namespace boost::system;
using namespace isc::cryptolink;
namespace isc {
namespace asiolink {
// Enforce TLS 1.2 when the generic TLS method is not available (i.e.
// the boost version is older than 1.64.0).
TlsContext::TlsContext(TlsRole role)
: TlsContextBase(role), cert_required_(true),
#ifdef HAVE_GENERIC_TLS_METHOD
context_(context::method::tls)
#else
#ifdef HAVE_TLS_1_2_METHOD
context_(context::method::tlsv12)
#else
context_(context::method::tlsv1)
#endif
#endif
{
// Not leave the verify mode to OpenSSL default.
setCertRequired(true);
}
boost::asio::ssl::context&
TlsContext::getContext() {
return (context_);
}
::SSL_CTX*
TlsContext::getNativeContext() {
return (context_.native_handle());
}
void
TlsContext::setCertRequired(bool cert_required) {
if (!cert_required && (getRole() == TlsRole::CLIENT)) {
isc_throw(BadValue,
"'cert-required' parameter must be true for a TLS client");
}
cert_required_ = cert_required;
error_code ec;
int mode = verify_peer | verify_fail_if_no_peer_cert;
if (!cert_required_) {
mode = verify_none;
}
context_.set_verify_mode(mode, ec);
if (ec) {
isc_throw(LibraryError, getErrMsg(ec));
}
}
bool
TlsContext::getCertRequired() const {
return (cert_required_);
}
void
TlsContext::loadCaFile(const std::string& ca_file) {
error_code ec;
context_.load_verify_file(ca_file, ec);
if (ec) {
isc_throw(LibraryError, getErrMsg(ec));
}
}
void
TlsContext::loadCaPath(const std::string& ca_path) {
error_code ec;
context_.add_verify_path(ca_path, ec);
if (ec) {
isc_throw(LibraryError, getErrMsg(ec));
}
}
void
TlsContext::loadCertFile(const std::string& cert_file) {
error_code ec;
context_.use_certificate_chain_file(cert_file, ec);
if (ec) {
isc_throw(LibraryError, getErrMsg(ec));
}
}
void
TlsContext::loadKeyFile(const std::string& key_file) {
error_code ec;
context_.use_private_key_file(key_file, context::file_format::pem, ec);
if (ec) {
isc_throw(LibraryError, getErrMsg(ec));
}
}
std::string
TlsContext::getErrMsg(error_code ec) {
std::string msg = ec.message();
#ifdef ERR_SYSTEM_ERROR
// The SSL category message() method uses ERR_reason_error_string()
// which since OpenSSL 3.0 returns NULL on system errors in order
// to avoid a memory leak with the strerror_r() buffer.
// This code recovers the user-friendly message from the error code
// value i.e. the OpenSSL error. Layout of OpenSSL errors is detailed
// in the OpenSSL err.h header.
unsigned long err = static_cast<unsigned long>(ec.value());
if ((msg == "asio.ssl error") && (ERR_SYSTEM_ERROR(err))) {
char buf[1024];
#ifndef __USE_GNU
if (strerror_r(err & ERR_SYSTEM_MASK, &buf[0], sizeof(buf)) == 0) {
msg = buf;
}
#else
msg = strerror_r(err & ERR_SYSTEM_MASK, &buf[0], sizeof(buf));
#endif
}
#endif
return (msg);
}
} // namespace asiolink
} // namespace isc
#endif // WITH_OPENSSL
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