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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.
*/
/**
* SAML2POSTDecoder.cpp
*
* SAML 2.0 HTTP POST binding message encoder.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/SecurityPolicy.h"
#include "saml2/binding/SAML2MessageDecoder.h"
#include "saml2/core/Protocols.h"
#include "saml2/metadata/Metadata.h"
#include "saml2/metadata/MetadataProvider.h"
#include <xercesc/framework/MemBufInputSource.hpp>
#include <xercesc/framework/Wrapper4InputSource.hpp>
#include <xercesc/util/Base64.hpp>
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/io/HTTPRequest.h>
#include <xmltooling/util/NDC.h>
#include <xmltooling/util/ParserPool.h>
#include <xmltooling/validation/ValidatorSuite.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 std;
namespace opensaml {
namespace saml2p {
class SAML_DLLLOCAL SAML2POSTDecoder : public SAML2MessageDecoder
{
public:
SAML2POSTDecoder() {}
virtual ~SAML2POSTDecoder() {}
xmltooling::XMLObject* decode(
std::string& relayState,
const GenericRequest& genericRequest,
SecurityPolicy& policy
) const;
};
MessageDecoder* SAML_DLLLOCAL SAML2POSTDecoderFactory(const pair<const DOMElement*,const XMLCh*>&)
{
return new SAML2POSTDecoder();
}
};
};
XMLObject* SAML2POSTDecoder::decode(
std::string& relayState,
const GenericRequest& genericRequest,
SecurityPolicy& policy
) const
{
#ifdef _DEBUG
xmltooling::NDC ndc("decode");
#endif
Category& log = Category::getInstance(SAML_LOGCAT".MessageDecoder.SAML2POST");
log.debug("validating input");
const HTTPRequest* httpRequest=dynamic_cast<const HTTPRequest*>(&genericRequest);
if (!httpRequest)
throw BindingException("Unable to cast request object to HTTPRequest type.");
if (strcmp(httpRequest->getMethod(),"POST"))
throw BindingException("Invalid HTTP method ($1).", params(1, httpRequest->getMethod()));
const char* msg = httpRequest->getParameter("SAMLResponse");
if (!msg)
msg = httpRequest->getParameter("SAMLRequest");
if (!msg)
throw BindingException("Request missing SAMLRequest or SAMLResponse form parameter.");
const char* state = httpRequest->getParameter("RelayState");
if (state)
relayState = state;
else
relayState.erase();
// Decode the base64 into SAML.
xsecsize_t x;
XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(msg),&x);
if (!decoded)
throw BindingException("Unable to decode base64 in POST binding message.");
log.debugStream() << "decoded SAML message:\n" << decoded << logging::eol;
// Parse and bind the document into an XMLObject.
MemBufInputSource src(decoded, x, "SAMLMessage", true);
Wrapper4InputSource dsrc(&src, false);
DOMDocument* doc = (policy.getValidating() ? XMLToolingConfig::getConfig().getValidatingParser()
: XMLToolingConfig::getConfig().getParser()).parse(dsrc);
XercesJanitor<DOMDocument> janitor(doc);
auto_ptr<XMLObject> xmlObject(XMLObjectBuilder::buildOneFromElement(doc->getDocumentElement(), true));
janitor.release();
saml2::RootObject* root = nullptr;
StatusResponseType* response = nullptr;
RequestAbstractType* request = dynamic_cast<RequestAbstractType*>(xmlObject.get());
if (!request) {
response = dynamic_cast<StatusResponseType*>(xmlObject.get());
if (!response)
throw BindingException("XML content for SAML 2.0 HTTP-POST Decoder must be a SAML 2.0 protocol message.");
root = static_cast<saml2::RootObject*>(response);
}
else {
root = static_cast<saml2::RootObject*>(request);
}
SchemaValidators.validate(root);
// Run through the policy.
extractMessageDetails(*root, genericRequest, samlconstants::SAML20P_NS, policy);
policy.evaluate(*root, &genericRequest);
// Check destination URL.
auto_ptr_char dest(request ? request->getDestination() : response->getDestination());
const char* dest2 = httpRequest->getRequestURL();
const char* delim = strchr(dest2, '?');
if ((root->getSignature() || httpRequest->getParameter("Signature")) && (!dest.get() || !*(dest.get()))) {
log.error("signed SAML message missing Destination attribute");
throw BindingException("Signed SAML message missing Destination attribute identifying intended destination.");
}
else if (dest.get() && *dest.get() && ((delim && strncmp(dest.get(), dest2, delim - dest2)) || (!delim && strcmp(dest.get(),dest2)))) {
log.error("POST targeted at (%s), but delivered to (%s)", dest.get(), dest2);
throw BindingException("SAML message delivered with POST to incorrect server URL.");
}
return xmlObject.release();
}
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