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icinga2/lib/base/tlsstream.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "base/tlsstream.hpp"
#include "base/utility.hpp"
#include "base/exception.hpp"
#include "base/logger.hpp"
#include <boost/bind.hpp>
#include <iostream>
using namespace icinga;
int I2_EXPORT TlsStream::m_SSLIndex;
bool I2_EXPORT TlsStream::m_SSLIndexInitialized = false;
/**
* Constructor for the TlsStream class.
*
* @param role The role of the client.
* @param sslContext The SSL context for the client.
*/
TlsStream::TlsStream(const Socket::Ptr& socket, ConnectionRole role, const boost::shared_ptr<SSL_CTX>& sslContext)
: m_Eof(false), m_VerifyOK(true), m_Socket(socket), m_Role(role)
{
std::ostringstream msgbuf;
char errbuf[120];
m_SSL = boost::shared_ptr<SSL>(SSL_new(sslContext.get()), SSL_free);
if (!m_SSL) {
msgbuf << "SSL_new() failed with code " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
Log(LogCritical, "TlsStream", msgbuf.str());
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_new")
<< errinfo_openssl_error(ERR_peek_error()));
}
if (!m_SSLIndexInitialized) {
m_SSLIndex = SSL_get_ex_new_index(0, const_cast<char *>("TlsStream"), NULL, NULL, NULL);
m_SSLIndexInitialized = true;
}
SSL_set_ex_data(m_SSL.get(), m_SSLIndex, this);
SSL_set_verify(m_SSL.get(), SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, &TlsStream::ValidateCertificate);
socket->MakeNonBlocking();
SSL_set_fd(m_SSL.get(), socket->GetFD());
if (m_Role == RoleServer)
SSL_set_accept_state(m_SSL.get());
else
SSL_set_connect_state(m_SSL.get());
}
int TlsStream::ValidateCertificate(int preverify_ok, X509_STORE_CTX *ctx)
{
SSL *ssl = static_cast<SSL *>(X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()));
TlsStream *stream = static_cast<TlsStream *>(SSL_get_ex_data(ssl, m_SSLIndex));
if (!preverify_ok)
stream->m_VerifyOK = false;
return 1;
}
bool TlsStream::IsVerifyOK(void) const
{
return m_VerifyOK;
}
/**
* Retrieves the X509 certficate for this client.
*
* @returns The X509 certificate.
*/
boost::shared_ptr<X509> TlsStream::GetClientCertificate(void) const
{
boost::mutex::scoped_lock lock(m_SSLLock);
return boost::shared_ptr<X509>(SSL_get_certificate(m_SSL.get()), &Utility::NullDeleter);
}
/**
* Retrieves the X509 certficate for the peer.
*
* @returns The X509 certificate.
*/
boost::shared_ptr<X509> TlsStream::GetPeerCertificate(void) const
{
boost::mutex::scoped_lock lock(m_SSLLock);
return boost::shared_ptr<X509>(SSL_get_peer_certificate(m_SSL.get()), X509_free);
}
void TlsStream::Handshake(void)
{
std::ostringstream msgbuf;
char errbuf[120];
boost::mutex::scoped_lock alock(m_IOActionLock);
for (;;) {
int rc, err;
{
boost::mutex::scoped_lock lock(m_SSLLock);
rc = SSL_do_handshake(m_SSL.get());
if (rc > 0)
break;
err = SSL_get_error(m_SSL.get(), rc);
}
switch (err) {
case SSL_ERROR_WANT_READ:
try {
m_Socket->Poll(true, false);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_WANT_WRITE:
try {
m_Socket->Poll(false, true);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_ZERO_RETURN:
Close();
return;
default:
msgbuf << "SSL_do_handshake() failed with code " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
Log(LogCritical, "TlsStream", msgbuf.str());
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_do_handshake")
<< errinfo_openssl_error(ERR_peek_error()));
}
}
}
/**
* Processes data for the stream.
*/
size_t TlsStream::Read(void *buffer, size_t count)
{
size_t left = count;
std::ostringstream msgbuf;
char errbuf[120];
bool want_read;
{
boost::mutex::scoped_lock lock(m_SSLLock);
want_read = !SSL_pending(m_SSL.get()) || SSL_want_read(m_SSL.get());
}
if (want_read)
m_Socket->Poll(true, false);
boost::mutex::scoped_lock alock(m_IOActionLock);
while (left > 0) {
int rc, err;
{
boost::mutex::scoped_lock lock(m_SSLLock);
rc = SSL_read(m_SSL.get(), ((char *)buffer) + (count - left), left);
if (rc <= 0)
err = SSL_get_error(m_SSL.get(), rc);
}
if (rc <= 0) {
switch (err) {
case SSL_ERROR_WANT_READ:
try {
m_Socket->Poll(true, false);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_WANT_WRITE:
try {
m_Socket->Poll(false, true);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_ZERO_RETURN:
Close();
return count - left;
default:
if (ERR_peek_error() != 0) {
msgbuf << "SSL_read() failed with code " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
Log(LogCritical, "TlsStream", msgbuf.str());
}
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_read")
<< errinfo_openssl_error(ERR_peek_error()));
}
}
left -= rc;
}
return count;
}
void TlsStream::Write(const void *buffer, size_t count)
{
size_t left = count;
std::ostringstream msgbuf;
char errbuf[120];
m_Socket->Poll(false, true);
boost::mutex::scoped_lock alock(m_IOActionLock);
while (left > 0) {
int rc, err;
{
boost::mutex::scoped_lock lock(m_SSLLock);
rc = SSL_write(m_SSL.get(), ((const char *)buffer) + (count - left), left);
if (rc <= 0)
err = SSL_get_error(m_SSL.get(), rc);
}
if (rc <= 0) {
switch (err) {
case SSL_ERROR_WANT_READ:
try {
m_Socket->Poll(true, false);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_WANT_WRITE:
try {
m_Socket->Poll(false, true);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_ZERO_RETURN:
Close();
return;
default:
if (ERR_peek_error() != 0) {
msgbuf << "SSL_write() failed with code " << ERR_peek_error() << ", \"" << ERR_error_string(ERR_peek_error(), errbuf) << "\"";
Log(LogCritical, "TlsStream", msgbuf.str());
}
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_write")
<< errinfo_openssl_error(ERR_peek_error()));
}
}
left -= rc;
}
}
/**
* Closes the stream.
*/
void TlsStream::Close(void)
{
boost::mutex::scoped_lock alock(m_IOActionLock);
m_Eof = true;
for (int i = 0; i < 5; i++) {
int rc, err;
{
boost::mutex::scoped_lock lock(m_SSLLock);
rc = SSL_shutdown(m_SSL.get());
if (rc == 0)
continue;
if (rc > 0)
break;
err = SSL_get_error(m_SSL.get(), rc);
}
switch (err) {
case SSL_ERROR_WANT_READ:
try {
m_Socket->Poll(true, false);
} catch (const std::exception&) {}
continue;
case SSL_ERROR_WANT_WRITE:
try {
m_Socket->Poll(false, true);
} catch (const std::exception&) {}
continue;
default:
goto close_socket;
}
}
close_socket:
m_Socket->Close();
}
bool TlsStream::IsEof(void) const
{
return m_Eof;
}
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