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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#pragma once
#include <string>
#include <map>
#include <set>
#include <tuple>
#include <memory>
#include <utility>
#include <openssl/ssl.h>
#include <openvpn/common/rc.hpp>
#include <openvpn/common/msfind.hpp>
namespace openvpn {
// Client-side session cache.
// (We don't cache server-side sessions because we use TLS
// session resumption tickets which are stateless on the server).
class OpenSSLSessionCache : public RC<thread_unsafe_refcount>
{
public:
typedef RCPtr<OpenSSLSessionCache> Ptr;
OPENVPN_EXCEPTION(openssl_sess_cache_error);
// Wrapper for OpenSSL SSL_SESSION pointers that manages reference counts.
class Session
{
public:
Session(::SSL_SESSION *sess) // caller must pre-increment refcount on sess
: sess_(sess)
{
}
Session(Session &&other) noexcept
{
sess_ = other.sess_;
other.sess_ = nullptr;
}
Session &operator=(Session &&other) noexcept
{
if (sess_)
::SSL_SESSION_free(sess_);
sess_ = other.sess_;
other.sess_ = nullptr;
return *this;
}
::SSL_SESSION *openssl_session() const
{
return sess_;
}
bool operator<(const Session &rhs) const // used when Session is a std::set key
{
return sess_ < rhs.sess_;
}
explicit operator bool() const
{
return sess_ != nullptr;
}
~Session()
{
if (sess_)
::SSL_SESSION_free(sess_);
}
private:
// These methods are deleted because we have no way to increment
// an SSL_SESSION refcount until OpenSSL 1.1.
Session(const Session &) = delete;
Session &operator=(const Session &) = delete;
::SSL_SESSION *sess_;
};
class Key
{
public:
typedef std::unique_ptr<Key> UPtr;
Key(const std::string &key_arg,
OpenSSLSessionCache::Ptr cache_arg)
: key(key_arg),
cache(std::move(cache_arg))
{
// OPENVPN_LOG("OpenSSLSessionCache::Key CONSTRUCT key=" << key);
}
void commit(::SSL_SESSION *sess)
{
if (!sess)
return;
auto mi = MSF::find(cache->map, key);
if (mi)
{
/* auto ins = */ mi->second.emplace(sess);
// OPENVPN_LOG("OpenSSLSessionCache::Key::commit ADD=" << ins.second << " key=" << key);
}
else
{
// OPENVPN_LOG("OpenSSLSessionCache::Key::commit CREATE key=" << key);
auto ins = cache->map.emplace(std::piecewise_construct,
std::forward_as_tuple(key),
std::forward_as_tuple());
ins.first->second.emplace(sess);
}
}
private:
const std::string key;
OpenSSLSessionCache::Ptr cache;
};
// Remove a session from the map after calling func() on it.
// This would be a lot cleaner if we had C++17 std::set::extract().
template <typename FUNC>
void extract(const std::string &key, FUNC func)
{
auto mi = MSF::find(map, key);
if (mi)
{
// OPENVPN_LOG("OpenSSLSessionCache::Key::lookup EXISTS key=" << key);
SessionSet &ss = mi->second;
if (ss.empty())
throw openssl_sess_cache_error("internal error: SessionSet is empty");
auto ssi = ss.begin();
try
{
func(ssi->openssl_session());
}
catch (...)
{
remove_session(mi, ss, ssi);
throw;
}
remove_session(mi, ss, ssi);
}
else
{
// OPENVPN_LOG("OpenSSLSessionCache::Key::lookup NOT_FOUND key=" << key);
}
}
private:
struct SessionSet : public std::set<Session>
{
};
typedef std::map<std::string, SessionSet> Map;
void remove_session(Map::iterator mi, SessionSet &ss, SessionSet::iterator ssi)
{
ss.erase(ssi);
if (ss.empty())
map.erase(mi);
}
Map map;
};
} // namespace openvpn
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