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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*/
package org.apache.cxf.ws.security.wss4j.policyvalidators;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.xml.namespace.QName;
import org.w3c.dom.Element;
import org.apache.cxf.helpers.CastUtils;
import org.apache.cxf.message.Message;
import org.apache.cxf.ws.policy.AssertionInfo;
import org.apache.cxf.ws.policy.AssertionInfoMap;
import org.apache.cxf.ws.security.policy.SP12Constants;
import org.apache.cxf.ws.security.policy.SPConstants;
import org.apache.cxf.ws.security.policy.model.EncryptionToken;
import org.apache.cxf.ws.security.policy.model.Layout;
import org.apache.cxf.ws.security.policy.model.ProtectionToken;
import org.apache.cxf.ws.security.policy.model.SignatureToken;
import org.apache.cxf.ws.security.policy.model.SymmetricAsymmetricBindingBase;
import org.apache.cxf.ws.security.policy.model.Token;
import org.apache.cxf.ws.security.policy.model.TokenWrapper;
import org.apache.cxf.ws.security.policy.model.X509Token;
import org.apache.neethi.Assertion;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSDataRef;
import org.apache.ws.security.WSSecurityEngineResult;
import org.apache.ws.security.message.token.Timestamp;
import org.apache.ws.security.util.WSSecurityUtil;
/**
* Some abstract functionality for validating a security binding.
*/
public abstract class AbstractBindingPolicyValidator implements BindingPolicyValidator {
private static final QName SIG_QNAME = new QName(WSConstants.SIG_NS, WSConstants.SIG_LN);
/**
* Validate a Timestamp
* @param includeTimestamp whether a Timestamp must be included or not
* @param transportBinding whether the Transport binding is in use or not
* @param signedResults the signed results list
* @param message the Message object
* @return whether the Timestamp policy is valid or not
*/
protected boolean validateTimestamp(
boolean includeTimestamp,
boolean transportBinding,
List results,
List signedResults,
Message message
) {
List timestampResults = new ArrayList();
WSSecurityUtil.fetchAllActionResults(results, WSConstants.TS, timestampResults);
// Check whether we received a timestamp and compare it to the policy
if (includeTimestamp && timestampResults.size() != 1) {
return false;
} else if (!includeTimestamp) {
if (timestampResults.isEmpty()) {
return true;
}
return false;
}
// At this point we received a (required) Timestamp. Now check that it is integrity protected.
if (transportBinding) {
return true;
} else if (!signedResults.isEmpty()) {
Timestamp timestamp =
(Timestamp)timestampResults.get(0).get(WSSecurityEngineResult.TAG_TIMESTAMP);
for (WSSecurityEngineResult signedResult : signedResults) {
List dataRefs =
CastUtils.cast((List)signedResult.get(WSSecurityEngineResult.TAG_DATA_REF_URIS));
for (WSDataRef dataRef : dataRefs) {
if (timestamp.getElement() == dataRef.getProtectedElement()) {
return true;
}
}
}
}
return false;
}
/**
* Validate the entire header and body signature property.
*/
protected boolean validateEntireHeaderAndBodySignatures(
List signedResults
) {
for (WSSecurityEngineResult signedResult : signedResults) {
List dataRefs =
CastUtils.cast((List)signedResult.get(WSSecurityEngineResult.TAG_DATA_REF_URIS));
for (WSDataRef dataRef : dataRefs) {
String xpath = dataRef.getXpath();
if (xpath != null) {
String[] nodes = xpath.split("/");
// envelope/Body || envelope/Header/header || envelope/Header/wsse:Security/header
if (nodes.length == 5 && nodes[3].contains("Security")) {
continue;
} else if (nodes.length < 3 || nodes.length > 4) {
return false;
}
}
}
}
return true;
}
/**
* Validate the layout assertion. It just checks the LaxTsFirst and LaxTsLast properties
*/
protected boolean validateLayout(
boolean laxTimestampFirst,
boolean laxTimestampLast,
List results
) {
if (laxTimestampFirst) {
if (results.isEmpty()) {
return false;
}
Integer firstAction = (Integer)results.get(0).get(WSSecurityEngineResult.TAG_ACTION);
if (firstAction.intValue() != WSConstants.TS) {
return false;
}
} else if (laxTimestampLast) {
if (results.isEmpty()) {
return false;
}
Integer lastAction =
(Integer)results.get(results.size() - 1).get(WSSecurityEngineResult.TAG_ACTION);
if (lastAction.intValue() != WSConstants.TS) {
return false;
}
}
return true;
}
/**
* Check various properties set in the policy of the binding
*/
protected boolean checkProperties(
SymmetricAsymmetricBindingBase binding,
AssertionInfo ai,
AssertionInfoMap aim,
List results,
List signedResults,
Message message
) {
// Check the AlgorithmSuite
AlgorithmSuitePolicyValidator algorithmValidator = new AlgorithmSuitePolicyValidator(results);
if (!algorithmValidator.validatePolicy(ai, binding.getAlgorithmSuite())) {
return false;
}
// Check the IncludeTimestamp
if (!validateTimestamp(binding.isIncludeTimestamp(), false, results, signedResults, message)) {
String error = "Received Timestamp does not match the requirements";
notAssertPolicy(aim, SP12Constants.INCLUDE_TIMESTAMP, error);
ai.setNotAsserted(error);
return false;
}
assertPolicy(aim, SP12Constants.INCLUDE_TIMESTAMP);
// Check the Layout
Layout layout = binding.getLayout();
boolean timestampFirst = layout.getValue() == SPConstants.Layout.LaxTimestampFirst;
boolean timestampLast = layout.getValue() == SPConstants.Layout.LaxTimestampLast;
if (!validateLayout(timestampFirst, timestampLast, results)) {
String error = "Layout does not match the requirements";
notAssertPolicy(aim, SP12Constants.LAYOUT, error);
ai.setNotAsserted(error);
return false;
}
assertPolicy(aim, SP12Constants.LAYOUT);
// Check the EntireHeaderAndBodySignatures property
if (binding.isEntireHeadersAndBodySignatures()
&& !validateEntireHeaderAndBodySignatures(signedResults)) {
String error = "OnlySignEntireHeadersAndBody does not match the requirements";
ai.setNotAsserted(error);
return false;
}
// Check whether the signatures were encrypted or not
if (binding.isSignatureProtection() && !isSignatureEncrypted(results)) {
ai.setNotAsserted("The signature is not protected");
return false;
}
return true;
}
/**
* Check the Protection Order of the binding
*/
protected boolean checkProtectionOrder(
SymmetricAsymmetricBindingBase binding,
AssertionInfo ai,
List results
) {
if (binding.getProtectionOrder() == SPConstants.ProtectionOrder.EncryptBeforeSigning) {
if (!binding.isSignatureProtection() && isSignedBeforeEncrypted(results)) {
ai.setNotAsserted("Not encrypted before signed");
return false;
}
} else if (isEncryptedBeforeSigned(results)) {
ai.setNotAsserted("Not signed before encrypted");
return false;
}
return true;
}
/**
* Check to see if a signature was applied before encryption.
* Note that results are stored in the reverse order.
*/
private boolean isSignedBeforeEncrypted(List results) {
boolean signed = false;
for (WSSecurityEngineResult result : results) {
Integer actInt = (Integer)result.get(WSSecurityEngineResult.TAG_ACTION);
List el =
CastUtils.cast((List)result.get(WSSecurityEngineResult.TAG_DATA_REF_URIS));
// Don't count an endorsing signature
if (actInt.intValue() == WSConstants.SIGN && el != null
&& !(el.size() == 1 && el.get(0).getName().equals(SIG_QNAME))) {
signed = true;
}
if (actInt.intValue() == WSConstants.ENCR && el != null) {
if (signed) {
return true;
}
return false;
}
}
return false;
}
/**
* Check to see if encryption was applied before signature.
* Note that results are stored in the reverse order.
*/
private boolean isEncryptedBeforeSigned(List results) {
boolean encrypted = false;
for (WSSecurityEngineResult result : results) {
Integer actInt = (Integer)result.get(WSSecurityEngineResult.TAG_ACTION);
List el =
CastUtils.cast((List)result.get(WSSecurityEngineResult.TAG_DATA_REF_URIS));
if (actInt.intValue() == WSConstants.ENCR && el != null) {
encrypted = true;
}
// Don't count an endorsing signature
if (actInt.intValue() == WSConstants.SIGN && el != null
&& !(el.size() == 1 && el.get(0).getName().equals(SIG_QNAME))) {
if (encrypted) {
return true;
}
return false;
}
}
return false;
}
/**
* Check the derived key requirement.
*/
protected boolean checkDerivedKeys(
TokenWrapper tokenWrapper,
boolean hasDerivedKeys,
List signedResults,
List encryptedResults
) {
Token token = tokenWrapper.getToken();
// If derived keys are not required then just return
if (!(token instanceof X509Token && token.isDerivedKeys())) {
return true;
}
if (tokenWrapper instanceof EncryptionToken
&& !hasDerivedKeys && !encryptedResults.isEmpty()) {
return false;
} else if (tokenWrapper instanceof SignatureToken
&& !hasDerivedKeys && !signedResults.isEmpty()) {
return false;
} else if (tokenWrapper instanceof ProtectionToken
&& !hasDerivedKeys && !(signedResults.isEmpty() || encryptedResults.isEmpty())) {
return false;
}
return true;
}
/**
* Check whether all Signature (and SignatureConfirmation) elements were encrypted
*/
protected boolean isSignatureEncrypted(List results) {
for (WSSecurityEngineResult result : results) {
Integer actInt = (Integer)result.get(WSSecurityEngineResult.TAG_ACTION);
if (actInt.intValue() == WSConstants.SIGN
|| actInt.intValue() == WSConstants.SC) {
String sigId = (String)result.get(WSSecurityEngineResult.TAG_ID);
if (sigId == null || !isIdEncrypted(sigId, results)) {
return false;
}
}
}
return true;
}
/**
* Return true if the given id was encrypted
*/
private boolean isIdEncrypted(String sigId, List results) {
for (WSSecurityEngineResult wser : results) {
Integer actInt = (Integer)wser.get(WSSecurityEngineResult.TAG_ACTION);
if (actInt.intValue() == WSConstants.ENCR) {
List el =
CastUtils.cast((List)wser.get(WSSecurityEngineResult.TAG_DATA_REF_URIS));
if (el != null) {
for (WSDataRef r : el) {
Element protectedElement = r.getProtectedElement();
if (protectedElement != null) {
String id = protectedElement.getAttribute("Id");
String wsuId = protectedElement.getAttributeNS(WSConstants.WSU_NS, "Id");
if (sigId.equals(id) || sigId.equals(wsuId)) {
return true;
}
}
}
}
}
}
return false;
}
protected void assertPolicy(AssertionInfoMap aim, Assertion token) {
Collection ais = aim.get(token.getName());
if (ais != null && !ais.isEmpty()) {
for (AssertionInfo ai : ais) {
if (ai.getAssertion() == token) {
ai.setAsserted(true);
}
}
}
}
protected boolean assertPolicy(AssertionInfoMap aim, QName q) {
Collection ais = aim.get(q);
if (ais != null && !ais.isEmpty()) {
for (AssertionInfo ai : ais) {
ai.setAsserted(true);
}
return true;
}
return false;
}
protected void notAssertPolicy(AssertionInfoMap aim, QName q, String msg) {
Collection ais = aim.get(q);
if (ais != null && !ais.isEmpty()) {
for (AssertionInfo ai : ais) {
ai.setNotAsserted(msg);
}
}
}
}