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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.
*/
/**
* SAML2ArtifactDecoder.cpp
*
* SAML 2.0 Artifact binding message decoder.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/SecurityPolicy.h"
#include "saml2/binding/SAML2Artifact.h"
#include "saml2/binding/SAML2MessageDecoder.h"
#include "saml2/core/Protocols.h"
#include "saml2/metadata/Metadata.h"
#include "saml2/metadata/MetadataProvider.h"
#include <boost/scoped_ptr.hpp>
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/io/HTTPRequest.h>
#include <xmltooling/util/NDC.h>
#include <xmltooling/util/ReplayCache.h>
using namespace opensaml::saml2md;
using namespace opensaml::saml2p;
using namespace opensaml::saml2;
using namespace opensaml;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace boost;
using namespace std;
namespace opensaml {
namespace saml2p {
class SAML_DLLLOCAL SAML2ArtifactDecoder : public SAML2MessageDecoder
{
public:
SAML2ArtifactDecoder() {}
virtual ~SAML2ArtifactDecoder() {}
xmltooling::XMLObject* decode(
std::string& relayState,
const GenericRequest& genericRequest,
SecurityPolicy& policy
) const;
};
MessageDecoder* SAML_DLLLOCAL SAML2ArtifactDecoderFactory(const pair<const DOMElement*,const XMLCh*>& p)
{
return new SAML2ArtifactDecoder();
}
};
};
XMLObject* SAML2ArtifactDecoder::decode(
string& relayState,
const GenericRequest& genericRequest,
SecurityPolicy& policy
) const
{
#ifdef _DEBUG
xmltooling::NDC ndc("decode");
#endif
Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2Artifact");
log.debug("validating input");
const HTTPRequest* httpRequest=dynamic_cast<const HTTPRequest*>(&genericRequest);
if (!httpRequest)
throw BindingException("Unable to cast request object to HTTPRequest type.");
const char* SAMLart = httpRequest->getParameter("SAMLart");
if (!SAMLart)
throw BindingException("Request missing SAMLart query string or form parameter.");
const char* state = httpRequest->getParameter("RelayState");
if (state)
relayState = state;
if (!m_artifactResolver || !policy.getMetadataProvider() || !policy.getRole())
throw BindingException("Artifact binding requires ArtifactResolver and MetadataProvider implementations be supplied.");
// Import the artifact.
scoped_ptr<SAMLArtifact> artifact;
try {
log.debug("processing encoded artifact (%s)", SAMLart);
// Check replay.
ReplayCache* replayCache = XMLToolingConfig::getConfig().getReplayCache();
if (replayCache) {
if (!replayCache->check("SAML2Artifact", SAMLart, time(nullptr) + (2*XMLToolingConfig::getConfig().clock_skew_secs))) {
log.error("replay detected of artifact (%s)", SAMLart);
throw BindingException("Rejecting replayed artifact ($1).", params(1,SAMLart));
}
}
else
log.warn("replay cache was not provided, this is a serious security risk!");
artifact.reset(SAMLArtifact::parse(SAMLart));
}
catch (ArtifactException&) {
log.error("error parsing artifact (%s)", SAMLart);
throw;
}
// Check the type.
SAML2Artifact* artifact2 = dynamic_cast<SAML2Artifact*>(artifact.get());
if (!artifact2) {
log.error("wrong artifact type");
throw BindingException("Artifact binding requires SAML 2.0 artifact.");
}
log.debug("attempting to determine source of artifact...");
MetadataProvider::Criteria& mc = policy.getMetadataProviderCriteria();
mc.artifact = artifact.get();
mc.role = policy.getRole();
mc.protocol = samlconstants::SAML20P_NS;
pair<const EntityDescriptor*,const RoleDescriptor*> provider=policy.getMetadataProvider()->getEntityDescriptor(mc);
if (!provider.first) {
log.error(
"metadata lookup failed, unable to determine issuer of artifact (0x%s)",
SAMLArtifact::toHex(artifact->getBytes()).c_str()
);
throw BindingException("Metadata lookup failed, unable to determine artifact issuer.");
}
if (log.isDebugEnabled()) {
auto_ptr_char issuer(provider.first->getEntityID());
log.debug("lookup succeeded, artifact issued by (%s)", issuer.get());
}
if (!provider.second || !dynamic_cast<const SSODescriptorType*>(provider.second)) {
log.error("unable to find compatible SAML 2.0 role (%s) in metadata", policy.getRole()->toString().c_str());
throw BindingException("Unable to find compatible metadata role for artifact issuer.");
}
// Set issuer into policy.
policy.setIssuer(provider.first->getEntityID());
policy.setIssuerMetadata(provider.second);
log.debug("calling ArtifactResolver...");
auto_ptr<ArtifactResponse> response(
m_artifactResolver->resolve(*artifact2, dynamic_cast<const SSODescriptorType&>(*provider.second), policy)
);
// The policy should be enforced against the ArtifactResponse by the resolve step.
// Reset only the message state.
policy.reset(true);
// Now extract details from the payload and check that message.
XMLObject* payload = response->getPayload();
if (!payload) {
log.error("ArtifactResponse message did not contain a protocol message");
throw BindingException("ArtifactResponse message did not contain a protocol message.");
}
extractMessageDetails(*payload, genericRequest, samlconstants::SAML20P_NS, policy);
policy.evaluate(*payload, &genericRequest);
// Return the payload only.
response.release();
payload->detach();
return payload;
}
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