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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.
*/
/**
* SignatureProfileValidator.cpp
*
* SAML-specific signature verification.
*/
#include "internal.h"
#include "exceptions.h"
#include "signature/SignableObject.h"
#include "signature/SignatureProfileValidator.h"
#include <xmltooling/logging.h>
#include <xmltooling/signature/Signature.h>
#include <xercesc/util/XMLUniDefs.hpp>
#include <xsec/dsig/DSIGReference.hpp>
#include <xsec/dsig/DSIGSignature.hpp>
#include <xsec/dsig/DSIGTransformList.hpp>
#include <xsec/dsig/DSIGTransformEnvelope.hpp>
#include <xsec/dsig/DSIGTransformC14n.hpp>
using namespace opensaml;
using namespace xmlsignature;
using namespace xmltooling::logging;
using namespace xmltooling;
using namespace std;
SignatureProfileValidator::SignatureProfileValidator()
{
}
SignatureProfileValidator::~SignatureProfileValidator()
{
}
void SignatureProfileValidator::validate(const XMLObject* xmlObject) const
{
const Signature* sigObj=dynamic_cast<const Signature*>(xmlObject);
if (!sigObj)
throw ValidationException("Validator only applies to Signature objects.");
validateSignature(*sigObj);
}
void SignatureProfileValidator::validateSignature(const Signature& sigObj) const
{
DSIGSignature* sig=sigObj.getXMLSignature();
if (!sig)
throw ValidationException("Signature does not exist yet.");
const SignableObject* signableObj=dynamic_cast<const SignableObject*>(sigObj.getParent());
if (!signableObj)
throw ValidationException("Signature is not a child of a signable SAML object.");
if (sig->getObjectLength() != 0) {
Category::getInstance(SAML_LOGCAT ".SignatureProfileValidator").error("signature contained an embedded <Object> element");
throw ValidationException("Invalid signature profile for SAML object.");
}
sig->setIdByAttributeName(false);
bool valid=false;
const DSIGReferenceList* refs=sig->getReferenceList();
if (refs && refs->getSize()==1) {
const DSIGReference* ref=refs->item(0);
if (ref) {
const XMLCh* URI=ref->getURI();
const XMLCh* ID=signableObj->getXMLID();
if (URI==nullptr || *URI==0 || (*URI==chPound && ID && !XMLString::compareString(URI+1,ID))) {
const DSIGTransformList* tlist=ref->getTransforms();
if (tlist->getSize() <= 2) {
for (unsigned int i=0; tlist && i<tlist->getSize(); i++) {
const DSIGTransform* t = tlist->item(i);
if (dynamic_cast<const DSIGTransformEnvelope*>(t)) {
valid=true;
}
else if (!dynamic_cast<const DSIGTransformC14n*>(t)) {
Category::getInstance(SAML_LOGCAT ".SignatureProfileValidator").error("signature contained an invalid transform");
valid = false;
break;
}
}
}
if (valid && URI && *URI) {
valid = false;
if (sigObj.getDOM() && signableObj->getDOM()) {
DOMElement* signedNode = sigObj.getDOM()->getOwnerDocument()->getElementById(ID);
if (signedNode && signedNode->isSameNode(signableObj->getDOM())) {
valid = true;
}
else {
Category::getInstance(SAML_LOGCAT ".SignatureProfileValidator").error("signature reference does not match parent object node");
}
}
}
}
else {
Category::getInstance(SAML_LOGCAT ".SignatureProfileValidator").error("signature reference does not match parent object ID");
}
}
}
else {
Category::getInstance(SAML_LOGCAT ".SignatureProfileValidator").error("signature contained multiple or zero references");
}
if (!valid)
throw ValidationException("Invalid signature profile for SAML object.");
}
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