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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002-2013 Vincent Richard <[email protected]>
//
// 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 3 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#include "vmime/config.hpp"
#if VMIME_HAVE_TLS_SUPPORT
#include "vmime/security/cert/defaultCertificateVerifier.hpp"
#include "vmime/security/cert/X509Certificate.hpp"
#include "vmime/exception.hpp"
namespace vmime {
namespace security {
namespace cert {
defaultCertificateVerifier::defaultCertificateVerifier()
{
}
defaultCertificateVerifier::~defaultCertificateVerifier()
{
}
defaultCertificateVerifier::defaultCertificateVerifier(const defaultCertificateVerifier&)
: certificateVerifier()
{
// Not used
}
void defaultCertificateVerifier::verify
(shared_ptr <certificateChain> chain, const string& hostname)
{
if (chain->getCount() == 0)
return;
const string type = chain->getAt(0)->getType();
if (type == "X.509")
verifyX509(chain, hostname);
else
throw exceptions::unsupported_certificate_type(type);
}
void defaultCertificateVerifier::verifyX509
(shared_ptr <certificateChain> chain, const string& hostname)
{
// For every certificate in the chain, verify that the certificate
// has been issued by the next certificate in the chain
if (chain->getCount() >= 2)
{
for (unsigned int i = 0 ; i < chain->getCount() - 1 ; ++i)
{
shared_ptr <X509Certificate> cert =
dynamicCast <X509Certificate>(chain->getAt(i));
shared_ptr <X509Certificate> next =
dynamicCast <X509Certificate>(chain->getAt(i + 1));
if (!cert->checkIssuer(next))
{
throw exceptions::certificate_verification_exception
("Subject/issuer verification failed.");
}
}
}
// For every certificate in the chain, verify that the certificate
// is valid at the current time
const datetime now = datetime::now();
for (unsigned int i = 0 ; i < chain->getCount() ; ++i)
{
shared_ptr <X509Certificate> cert =
dynamicCast <X509Certificate>(chain->getAt(i));
const datetime begin = cert->getActivationDate();
const datetime end = cert->getExpirationDate();
if (now < begin || now > end)
{
throw exceptions::certificate_verification_exception
("Validity date check failed.");
}
}
// Check whether the certificate can be trusted
// -- First, verify that the the last certificate in the chain was
// -- issued by a third-party that we trust
shared_ptr <X509Certificate> lastCert =
dynamicCast <X509Certificate>(chain->getAt(chain->getCount() - 1));
bool trusted = false;
for (unsigned int i = 0 ; !trusted && i < m_x509RootCAs.size() ; ++i)
{
shared_ptr <X509Certificate> rootCa = m_x509RootCAs[i];
if (lastCert->verify(rootCa))
trusted = true;
}
// -- Next, if the issuer certificate cannot be verified against
// -- root CAs, compare the subject's certificate against the
// -- trusted certificates
shared_ptr <X509Certificate> firstCert =
dynamicCast <X509Certificate>(chain->getAt(0));
for (unsigned int i = 0 ; !trusted && i < m_x509TrustedCerts.size() ; ++i)
{
shared_ptr <X509Certificate> cert = m_x509TrustedCerts[i];
if (firstCert->equals(cert))
trusted = true;
}
if (!trusted)
{
throw exceptions::certificate_verification_exception
("Cannot verify certificate against trusted certificates.");
}
// Ensure the first certificate's subject name matches server hostname
if (!firstCert->verifyHostName(hostname))
{
throw exceptions::certificate_verification_exception
("Server identity cannot be verified.");
}
}
void defaultCertificateVerifier::setX509RootCAs
(const std::vector <shared_ptr <X509Certificate> >& caCerts)
{
m_x509RootCAs = caCerts;
}
void defaultCertificateVerifier::setX509TrustedCerts
(const std::vector <shared_ptr <X509Certificate> >& trustedCerts)
{
m_x509TrustedCerts = trustedCerts;
}
} // cert
} // security
} // vmime
#endif
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