mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-02-11 00:00:08 +08:00
125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Wrap a mbed TLS dhm_context object (Diffie Hellman parameters).
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#ifndef OPENVPN_MBEDTLS_PKI_DH_H
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#define OPENVPN_MBEDTLS_PKI_DH_H
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#include <string>
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#include <sstream>
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#include <cstring>
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#include <mbedtls/x509.h>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/rc.hpp>
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#include <openvpn/mbedtls/util/error.hpp>
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namespace openvpn {
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namespace MbedTLSPKI {
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class DH : public RC<thread_unsafe_refcount>
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{
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public:
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typedef RCPtr<DH> Ptr;
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DH() : dhc(nullptr) {}
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DH(const std::string& dh_txt, const std::string& title)
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: dhc(nullptr)
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{
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try {
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parse(dh_txt, title);
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}
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catch (...)
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{
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dealloc();
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throw;
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}
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}
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void parse(const std::string& dh_txt, const std::string& title)
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{
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alloc();
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// dh_txt.length() is increased by 1 as it does not include the NULL-terminator
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// which mbedtls_dhm_parse_dhm() expects to see.
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const int status = mbedtls_dhm_parse_dhm(dhc,
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(const unsigned char *)dh_txt.c_str(),
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dh_txt.length() + 1);
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if (status < 0)
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{
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throw MbedTLSException("error parsing " + title + " DH parameters", status);
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}
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if (status > 0)
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{
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std::ostringstream os;
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os << status << " DH parameters in " << title << " failed to parse";
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throw MbedTLSException(os.str());
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}
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// store PEM data to allow extraction
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pem_dhc = dh_txt;
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}
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std::string extract() const
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{
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return std::string(pem_dhc);
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}
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mbedtls_dhm_context* get() const
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{
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return dhc;
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}
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~DH()
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{
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dealloc();
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}
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private:
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void alloc()
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{
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if (!dhc)
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{
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dhc = new mbedtls_dhm_context;
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mbedtls_dhm_init(dhc);
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}
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}
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void dealloc()
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{
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if (dhc)
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{
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mbedtls_dhm_free(dhc);
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delete dhc;
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dhc = nullptr;
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}
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}
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mbedtls_dhm_context *dhc;
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std::string pem_dhc;
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};
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}
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}
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#endif
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