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/**
* Licensed to the University Corporation for Advanced Internet
* Development, Inc. (UCAID) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* UCAID licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
/**
* XMLSigningRule.cpp
*
* XML Signature checking SecurityPolicyRule.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/SecurityPolicy.h"
#include "binding/SecurityPolicyRule.h"
#include "saml2/core/Assertions.h"
#include "saml2/metadata/Metadata.h"
#include "saml2/metadata/MetadataCredentialCriteria.h"
#include "saml2/metadata/MetadataProvider.h"
#include "signature/SignatureProfileValidator.h"
#include <xmltooling/logging.h>
#include <xmltooling/security/SignatureTrustEngine.h>
#include <xmltooling/signature/Signature.h>
using namespace opensaml::saml2md;
using namespace opensaml;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace std;
using xmlsignature::SignatureException;
namespace opensaml {
class SAML_DLLLOCAL XMLSigningRule : public SecurityPolicyRule
{
public:
XMLSigningRule(const DOMElement* e);
virtual ~XMLSigningRule() {}
const char* getType() const {
return XMLSIGNING_POLICY_RULE;
}
bool evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const;
private:
bool m_errorFatal;
};
SecurityPolicyRule* SAML_DLLLOCAL XMLSigningRuleFactory(const DOMElement* const & e)
{
return new XMLSigningRule(e);
}
static const XMLCh errorFatal[] = UNICODE_LITERAL_10(e,r,r,o,r,F,a,t,a,l);
};
XMLSigningRule::XMLSigningRule(const DOMElement* e) : m_errorFatal(XMLHelper::getAttrBool(e, false, errorFatal))
{
}
bool XMLSigningRule::evaluate(const XMLObject& message, const GenericRequest* request, SecurityPolicy& policy) const
{
Category& log=Category::getInstance(SAML_LOGCAT".SecurityPolicyRule.XMLSigning");
if (!policy.getIssuerMetadata()) {
log.debug("ignoring message, no issuer metadata supplied");
return false;
}
const SignatureTrustEngine* sigtrust;
if (!(sigtrust=dynamic_cast<const SignatureTrustEngine*>(policy.getTrustEngine()))) {
log.debug("ignoring message, no SignatureTrustEngine supplied");
return false;
}
const SignableObject* signable = dynamic_cast<const SignableObject*>(&message);
if (!signable || !signable->getSignature())
return false;
log.debug("validating signature profile");
try {
SignatureProfileValidator sigval;
sigval.validateSignature(*(signable->getSignature()));
}
catch (ValidationException& ve) {
log.error("signature profile failed to validate: %s", ve.what());
if (m_errorFatal)
throw;
return false;
}
// Set up criteria object.
MetadataCredentialCriteria cc(*(policy.getIssuerMetadata()));
if (!sigtrust->validate(*(signable->getSignature()), *(policy.getMetadataProvider()), &cc)) {
log.error("unable to verify message signature with supplied trust engine");
if (m_errorFatal)
throw SecurityPolicyException("Message was signed, but signature could not be verified.");
return false;
}
log.debug("signature verified against message issuer");
policy.setAuthenticated(true);
return true;
}
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