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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.
*/
/**
* SAML2RedirectEncoder.cpp
*
* SAML 2.0 HTTP-POST binding message encoder.
*/
#include "internal.h"
#include "exceptions.h"
#include "binding/MessageEncoder.h"
#include "saml2/binding/SAML2Redirect.h"
#include "saml2/core/Protocols.h"
#include <fstream>
#include <sstream>
#include <xercesc/util/Base64.hpp>
#include <xsec/dsig/DSIGConstants.hpp>
#include <xmltooling/logging.h>
#include <xmltooling/XMLToolingConfig.h>
#include <xmltooling/io/HTTPResponse.h>
#include <xmltooling/security/Credential.h>
#include <xmltooling/signature/Signature.h>
#include <xmltooling/util/NDC.h>
#include <xmltooling/util/URLEncoder.h>
using namespace opensaml::saml2p;
using namespace opensaml::saml2md;
using namespace opensaml;
using namespace xmlsignature;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace std;
namespace opensaml {
namespace saml2p {
class SAML_DLLLOCAL SAML2RedirectEncoder : public MessageEncoder
{
public:
SAML2RedirectEncoder() {}
virtual ~SAML2RedirectEncoder() {}
bool isCompact() const {
return true;
}
const XMLCh* getProtocolFamily() const {
return samlconstants::SAML20P_NS;
}
long encode(
GenericResponse& genericResponse,
XMLObject* xmlObject,
const char* destination,
const EntityDescriptor* recipient=nullptr,
const char* relayState=nullptr,
const ArtifactGenerator* artifactGenerator=nullptr,
const Credential* credential=nullptr,
const XMLCh* signatureAlg=nullptr,
const XMLCh* digestAlg=nullptr
) const;
};
MessageEncoder* SAML_DLLLOCAL SAML2RedirectEncoderFactory(const pair<const DOMElement*,const XMLCh*>& p)
{
return new SAML2RedirectEncoder();
}
};
};
long SAML2RedirectEncoder::encode(
GenericResponse& genericResponse,
XMLObject* xmlObject,
const char* destination,
const EntityDescriptor* recipient,
const char* relayState,
const ArtifactGenerator* artifactGenerator,
const Credential* credential,
const XMLCh* signatureAlg,
const XMLCh* digestAlg
) const
{
#ifdef _DEBUG
xmltooling::NDC ndc("encode");
#endif
Category& log = Category::getInstance(SAML_LOGCAT".MessageEncoder.SAML2Redirect");
log.debug("validating input");
HTTPResponse* httpResponse=dynamic_cast<HTTPResponse*>(&genericResponse);
if (!httpResponse)
throw BindingException("Unable to cast response interface to HTTPResponse type.");
if (xmlObject->getParent())
throw BindingException("Cannot encode XML content with parent.");
StatusResponseType* response = nullptr;
RequestAbstractType* request = dynamic_cast<RequestAbstractType*>(xmlObject);
if (!request) {
response = dynamic_cast<StatusResponseType*>(xmlObject);
if (!response)
throw BindingException("XML content for SAML 2.0 HTTP-Redirect Encoder must be a SAML 2.0 protocol message.");
}
// Check for XML signature.
if (request ? request->getSignature() : response->getSignature()) {
log.debug("message already signed, removing native signature due to size considerations");
request ? request->setSignature(nullptr) : response->setSignature(nullptr);
}
log.debug("marshalling, deflating, base64-encoding the message");
DOMElement* rootElement = xmlObject->marshall();
string xmlbuf;
XMLHelper::serialize(rootElement, xmlbuf);
log.debug("marshalled message:\n%s", xmlbuf.c_str());
unsigned int len;
char* deflated = deflate(const_cast<char*>(xmlbuf.c_str()), xmlbuf.length(), &len);
if (!deflated)
throw BindingException("Failed to deflate message.");
xsecsize_t xlen;
XMLByte* encoded=Base64::encode(reinterpret_cast<XMLByte*>(deflated), len, &xlen);
delete[] deflated;
if (!encoded)
throw BindingException("Base64 encoding of XML failed.");
// Create beginnings of redirect query string.
xmlbuf.erase();
for (const XMLByte* xb = encoded; *xb; ++xb) {
if (!isspace(*xb))
xmlbuf += *xb;
}
#ifdef OPENSAML_XERCESC_HAS_XMLBYTE_RELEASE
XMLString::release(&encoded);
#else
XMLString::release((char**)&encoded);
#endif
const URLEncoder* escaper = XMLToolingConfig::getConfig().getURLEncoder();
xmlbuf = (request ? "SAMLRequest=" : "SAMLResponse=") + escaper->encode(xmlbuf.c_str());
if (relayState && *relayState)
xmlbuf = xmlbuf + "&RelayState=" + escaper->encode(relayState);
if (credential) {
log.debug("signing the message");
// Sign the query string after adding the algorithm.
if (!signatureAlg)
signatureAlg = DSIGConstants::s_unicodeStrURIRSA_SHA1;
auto_ptr_char alg(signatureAlg);
xmlbuf = xmlbuf + "&SigAlg=" + escaper->encode(alg.get());
char sigbuf[1024];
memset(sigbuf,0,sizeof(sigbuf));
Signature::createRawSignature(credential->getPrivateKey(), signatureAlg, xmlbuf.c_str(), xmlbuf.length(), sigbuf, sizeof(sigbuf)-1);
xmlbuf = xmlbuf + "&Signature=" + escaper->encode(sigbuf);
}
// Generate redirect.
log.debug("message encoded, sending redirect to client");
xmlbuf.insert((string::size_type)0,(string::size_type)1,(strchr(destination,'?') ? '&' : '?'));
xmlbuf.insert(0,destination);
long ret = httpResponse->sendRedirect(xmlbuf.c_str());
// Cleanup by destroying XML.
delete xmlObject;
return ret;
}
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