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//
// SecureSocketImpl.cpp
//
// $Id: //poco/1.4/NetSSL_OpenSSL/src/SecureSocketImpl.cpp#11 $
//
// Library: NetSSL_OpenSSL
// Package: SSLSockets
// Module: SecureSocketImpl
//
// Copyright (c) 2006-2010, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Net/SecureSocketImpl.h"
#include "Poco/Net/SSLException.h"
#include "Poco/Net/Context.h"
#include "Poco/Net/X509Certificate.h"
#include "Poco/Net/Utility.h"
#include "Poco/Net/SecureStreamSocket.h"
#include "Poco/Net/SecureStreamSocketImpl.h"
#include "Poco/Net/StreamSocketImpl.h"
#include "Poco/Net/StreamSocket.h"
#include "Poco/Net/NetException.h"
#include "Poco/Net/DNS.h"
#include "Poco/NumberFormatter.h"
#include "Poco/NumberParser.h"
#include "Poco/Format.h"
#include <openssl/x509v3.h>
#include <openssl/err.h>
using Poco::IOException;
using Poco::TimeoutException;
using Poco::InvalidArgumentException;
using Poco::NumberFormatter;
using Poco::Timespan;
// workaround for C++-incompatible macro
#define POCO_BIO_set_nbio_accept(b,n) BIO_ctrl(b,BIO_C_SET_ACCEPT,1,(void*)((n)?"a":NULL))
namespace Poco {
namespace Net {
SecureSocketImpl::SecureSocketImpl(Poco::AutoPtr<SocketImpl> pSocketImpl, Context::Ptr pContext):
_pSSL(0),
_pSocket(pSocketImpl),
_pContext(pContext),
_needHandshake(false)
{
poco_check_ptr (_pSocket);
poco_check_ptr (_pContext);
}
SecureSocketImpl::~SecureSocketImpl()
{
try
{
reset();
}
catch (...)
{
}
}
SocketImpl* SecureSocketImpl::acceptConnection(SocketAddress& clientAddr)
{
poco_assert (!_pSSL);
StreamSocket ss = _pSocket->acceptConnection(clientAddr);
Poco::AutoPtr<SecureStreamSocketImpl> pSecureStreamSocketImpl = new SecureStreamSocketImpl(static_cast<StreamSocketImpl*>(ss.impl()), _pContext);
pSecureStreamSocketImpl->acceptSSL();
pSecureStreamSocketImpl->duplicate();
return pSecureStreamSocketImpl;
}
void SecureSocketImpl::acceptSSL()
{
poco_assert (!_pSSL);
BIO* pBIO = BIO_new(BIO_s_socket());
if (!pBIO) throw SSLException("Cannot create BIO object");
BIO_set_fd(pBIO, static_cast<int>(_pSocket->sockfd()), BIO_NOCLOSE);
_pSSL = SSL_new(_pContext->sslContext());
if (!_pSSL)
{
BIO_free(pBIO);
throw SSLException("Cannot create SSL object");
}
SSL_set_bio(_pSSL, pBIO, pBIO);
SSL_set_accept_state(_pSSL);
_needHandshake = true;
}
void SecureSocketImpl::connect(const SocketAddress& address, bool performHandshake)
{
if (_pSSL) reset();
poco_assert (!_pSSL);
_pSocket->connect(address);
connectSSL(performHandshake);
}
void SecureSocketImpl::connect(const SocketAddress& address, const Poco::Timespan& timeout, bool performHandshake)
{
if (_pSSL) reset();
poco_assert (!_pSSL);
_pSocket->connect(address, timeout);
Poco::Timespan receiveTimeout = _pSocket->getReceiveTimeout();
Poco::Timespan sendTimeout = _pSocket->getSendTimeout();
_pSocket->setReceiveTimeout(timeout);
_pSocket->setSendTimeout(timeout);
connectSSL(performHandshake);
_pSocket->setReceiveTimeout(receiveTimeout);
_pSocket->setSendTimeout(sendTimeout);
}
void SecureSocketImpl::connectNB(const SocketAddress& address)
{
if (_pSSL) reset();
poco_assert (!_pSSL);
_pSocket->connectNB(address);
connectSSL(false);
}
void SecureSocketImpl::connectSSL(bool performHandshake)
{
poco_assert (!_pSSL);
poco_assert (_pSocket->initialized());
BIO* pBIO = BIO_new(BIO_s_socket());
if (!pBIO) throw SSLException("Cannot create SSL BIO object");
BIO_set_fd(pBIO, static_cast<int>(_pSocket->sockfd()), BIO_NOCLOSE);
_pSSL = SSL_new(_pContext->sslContext());
if (!_pSSL)
{
BIO_free(pBIO);
throw SSLException("Cannot create SSL object");
}
SSL_set_bio(_pSSL, pBIO, pBIO);
#if OPENSSL_VERSION_NUMBER >= 0x0908060L && !defined(OPENSSL_NO_TLSEXT)
if (!_peerHostName.empty())
{
SSL_set_tlsext_host_name(_pSSL, _peerHostName.c_str());
}
#endif
if (_pSession)
{
SSL_set_session(_pSSL, _pSession->sslSession());
}
try
{
if (performHandshake && _pSocket->getBlocking())
{
int ret = SSL_connect(_pSSL);
handleError(ret);
verifyPeerCertificate();
}
else
{
SSL_set_connect_state(_pSSL);
_needHandshake = true;
}
}
catch (...)
{
SSL_free(_pSSL);
_pSSL = 0;
throw;
}
}
void SecureSocketImpl::bind(const SocketAddress& address, bool reuseAddress)
{
poco_check_ptr (_pSocket);
_pSocket->bind(address, reuseAddress);
}
void SecureSocketImpl::listen(int backlog)
{
poco_check_ptr (_pSocket);
_pSocket->listen(backlog);
}
void SecureSocketImpl::shutdown()
{
if (_pSSL)
{
// Don't shut down the socket more than once.
int shutdownState = SSL_get_shutdown(_pSSL);
bool shutdownSent = (shutdownState & SSL_SENT_SHUTDOWN) == SSL_SENT_SHUTDOWN;
if (!shutdownSent)
{
// A proper clean shutdown would require us to
// retry the shutdown if we get a zero return
// value, until SSL_shutdown() returns 1.
// However, this will lead to problems with
// most web browsers, so we just set the shutdown
// flag by calling SSL_shutdown() once and be
// done with it.
int rc = SSL_shutdown(_pSSL);
if (rc < 0) handleError(rc);
if (_pSocket->getBlocking())
{
_pSocket->shutdown();
}
}
}
}
void SecureSocketImpl::close()
{
try
{
shutdown();
}
catch (...)
{
}
_pSocket->close();
}
int SecureSocketImpl::sendBytes(const void* buffer, int length, int flags)
{
poco_assert (_pSocket->initialized());
poco_check_ptr (_pSSL);
int rc;
if (_needHandshake)
{
rc = completeHandshake();
if (rc == 1)
verifyPeerCertificate();
else if (rc == 0)
throw SSLConnectionUnexpectedlyClosedException();
else
return rc;
}
do
{
rc = SSL_write(_pSSL, buffer, length);
}
while (rc <= 0 && _pSocket->lastError() == POCO_EINTR);
if (rc <= 0)
{
rc = handleError(rc);
if (rc == 0) throw SSLConnectionUnexpectedlyClosedException();
}
return rc;
}
int SecureSocketImpl::receiveBytes(void* buffer, int length, int flags)
{
poco_assert (_pSocket->initialized());
poco_check_ptr (_pSSL);
int rc;
if (_needHandshake)
{
rc = completeHandshake();
if (rc == 1)
verifyPeerCertificate();
else
return rc;
}
do
{
rc = SSL_read(_pSSL, buffer, length);
}
while (rc <= 0 && _pSocket->lastError() == POCO_EINTR);
if (rc <= 0)
{
return handleError(rc);
}
return rc;
}
int SecureSocketImpl::available() const
{
poco_check_ptr (_pSSL);
return SSL_pending(_pSSL);
}
int SecureSocketImpl::completeHandshake()
{
poco_assert (_pSocket->initialized());
poco_check_ptr (_pSSL);
int rc;
do
{
rc = SSL_do_handshake(_pSSL);
}
while (rc <= 0 && _pSocket->lastError() == POCO_EINTR);
if (rc <= 0)
{
return handleError(rc);
}
_needHandshake = false;
return rc;
}
void SecureSocketImpl::verifyPeerCertificate()
{
if (_peerHostName.empty())
_peerHostName = _pSocket->peerAddress().host().toString();
verifyPeerCertificate(_peerHostName);
}
void SecureSocketImpl::verifyPeerCertificate(const std::string& hostName)
{
long certErr = verifyPeerCertificateImpl(hostName);
if (certErr != X509_V_OK)
{
std::string msg = Utility::convertCertificateError(certErr);
throw CertificateValidationException("Unacceptable certificate from " + hostName, msg);
}
}
long SecureSocketImpl::verifyPeerCertificateImpl(const std::string& hostName)
{
Context::VerificationMode mode = _pContext->verificationMode();
if (mode == Context::VERIFY_NONE || !_pContext->extendedCertificateVerificationEnabled() ||
(isLocalHost(hostName) && mode != Context::VERIFY_STRICT))
{
return X509_V_OK;
}
X509* pCert = SSL_get_peer_certificate(_pSSL);
if (pCert)
{
X509Certificate cert(pCert);
return cert.verify(hostName) ? X509_V_OK : X509_V_ERR_APPLICATION_VERIFICATION;
}
else return X509_V_OK;
}
bool SecureSocketImpl::isLocalHost(const std::string& hostName)
{
SocketAddress addr(hostName, 0);
return addr.host().isLoopback();
}
X509* SecureSocketImpl::peerCertificate() const
{
if (_pSSL)
return SSL_get_peer_certificate(_pSSL);
else
return 0;
}
int SecureSocketImpl::handleError(int rc)
{
if (rc > 0) return rc;
int sslError = SSL_get_error(_pSSL, rc);
int error = SocketImpl::lastError();
switch (sslError)
{
case SSL_ERROR_ZERO_RETURN:
return 0;
case SSL_ERROR_WANT_READ:
if (_pSocket->getBlocking() && error != 0)
{
if (error == POCO_EAGAIN)
throw TimeoutException(error);
else
SocketImpl::error(error);
}
return SecureStreamSocket::ERR_SSL_WANT_READ;
case SSL_ERROR_WANT_WRITE:
return SecureStreamSocket::ERR_SSL_WANT_WRITE;
case SSL_ERROR_WANT_CONNECT:
case SSL_ERROR_WANT_ACCEPT:
case SSL_ERROR_WANT_X509_LOOKUP:
// these should not occur
poco_bugcheck();
return rc;
case SSL_ERROR_SYSCALL:
if (error != 0)
{
if (_pSocket->getBlocking() && error == POCO_EAGAIN)
throw TimeoutException(error);
else
SocketImpl::error(error);
return rc;
}
// fallthrough
default:
{
long lastError = ERR_get_error();
if (lastError == 0)
{
if (rc == 0 || rc == -1)
{
throw SSLConnectionUnexpectedlyClosedException();
}
else
{
SecureStreamSocketImpl::error(Poco::format("The BIO reported an error: %d", rc));
}
}
else
{
char buffer[256];
ERR_error_string_n(lastError, buffer, sizeof(buffer));
std::string msg(buffer);
throw SSLException(msg);
}
}
break;
}
return rc;
}
void SecureSocketImpl::setPeerHostName(const std::string& peerHostName)
{
_peerHostName = peerHostName;
}
void SecureSocketImpl::reset()
{
close();
if (_pSSL)
{
SSL_free(_pSSL);
_pSSL = 0;
}
}
void SecureSocketImpl::abort()
{
_pSocket->shutdown();
}
Session::Ptr SecureSocketImpl::currentSession()
{
if (_pSSL)
{
SSL_SESSION* pSession = SSL_get1_session(_pSSL);
if (pSession)
{
if (_pSession && pSession == _pSession->sslSession())
{
SSL_SESSION_free(pSession);
return _pSession;
}
else return new Session(pSession);
}
}
return 0;
}
void SecureSocketImpl::useSession(Session::Ptr pSession)
{
_pSession = pSession;
}
bool SecureSocketImpl::sessionWasReused()
{
if (_pSSL)
return SSL_session_reused(_pSSL) != 0;
else
return false;
}
} } // namespace Poco::Net