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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.
*/
/**
* SAML1POSTDecoder.cpp
*
* SAML 1.x POST binding/profile message decoder.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/SecurityPolicy.h"
#include "saml1/binding/SAML1MessageDecoder.h"
#include "saml1/core/Assertions.h"
#include "saml1/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::saml1p;
using namespace opensaml::saml1;
using namespace opensaml;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace std;
namespace opensaml {
namespace saml1p {
class SAML_DLLLOCAL SAML1POSTDecoder : public SAML1MessageDecoder
{
public:
SAML1POSTDecoder() {}
virtual ~SAML1POSTDecoder() {}
xmltooling::XMLObject* decode(
std::string& relayState,
const GenericRequest& genericRequest,
GenericResponse* genericResponse,
SecurityPolicy& policy
) const;
};
MessageDecoder* SAML_DLLLOCAL SAML1POSTDecoderFactory(const DOMElement* const &, bool)
{
return new SAML1POSTDecoder();
}
};
};
XMLObject* SAML1POSTDecoder::decode(
string& relayState,
const GenericRequest& genericRequest,
GenericResponse*,
SecurityPolicy& policy
) const
{
#ifdef _DEBUG
xmltooling::NDC ndc("decode");
#endif
Category& log = Category::getInstance(SAML_LOGCAT ".MessageDecoder.SAML1POST");
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* samlResponse = httpRequest->getParameter("SAMLResponse");
const char* TARGET = httpRequest->getParameter("TARGET");
if (!samlResponse || !TARGET)
throw BindingException("Request missing SAMLResponse or TARGET form parameters.");
relayState = TARGET;
// Decode the base64 into XML.
XMLSize_t x;
XMLByte* decoded=Base64::decode(reinterpret_cast<const XMLByte*>(samlResponse),&x);
if (!decoded)
throw BindingException("Unable to decode base64 in POST profile response.");
log.debugStream() << "decoded SAML response:\n" << decoded << logging::eol;
// Parse and bind the document into an XMLObject.
MemBufInputSource src(decoded, x, "SAMLResponse", 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();
Response* response = dynamic_cast<Response*>(xmlObject.get());
if (!response)
throw BindingException("Decoded message was not a SAML 1.x Response.");
SchemaValidators.validate(response);
pair<bool,int> minor = response->getMinorVersion();
extractMessageDetails(
*response,
genericRequest,
(minor.first && minor.second==0) ? samlconstants::SAML10_PROTOCOL_ENUM : samlconstants::SAML11_PROTOCOL_ENUM,
policy
);
// Run through the policy.
policy.evaluate(*response,&genericRequest);
// Check recipient URL.
auto_ptr_char recipient(response->getRecipient());
const char* recipient2 = httpRequest->getRequestURL();
const char* delim = strchr(recipient2, '?');
if (!recipient.get() || !*(recipient.get())) {
log.error("response missing Recipient attribute");
throw BindingException("SAML response did not contain Recipient attribute identifying intended destination.");
}
else if ((delim && strncmp(recipient.get(), recipient2, delim - recipient2)) || (!delim && strcmp(recipient.get(),recipient2))) {
log.error("POST targeted at (%s), but delivered to (%s)", recipient.get(), recipient2);
throw BindingException("SAML message delivered with POST to incorrect server URL.");
}
return xmlObject.release();
}
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