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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.wss4j.dom.saml;
import java.security.MessageDigest;
import java.security.Principal;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.principal.WSDerivedKeyTokenPrincipal;
import org.apache.wss4j.common.saml.OpenSAMLUtil;
import org.apache.wss4j.common.saml.SAMLKeyInfo;
import org.apache.wss4j.common.saml.SamlAssertionWrapper;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.dom.WSDataRef;
import org.apache.wss4j.dom.engine.WSSecurityEngineResult;
import org.apache.wss4j.dom.handler.WSHandlerResult;
import org.w3c.dom.Element;
/**
* Some SAML Utility methods only for use in the DOM code.
*/
public final class DOMSAMLUtil {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(DOMSAMLUtil.class);
private DOMSAMLUtil() {
// complete
}
public static void validateSAMLResults(
WSHandlerResult handlerResults,
Certificate[] tlsCerts,
Element body
) throws WSSecurityException {
List samlResults = new ArrayList<>();
if (handlerResults.getActionResults().containsKey(WSConstants.ST_SIGNED)) {
samlResults.addAll(handlerResults.getActionResults().get(WSConstants.ST_SIGNED));
}
if (handlerResults.getActionResults().containsKey(WSConstants.ST_UNSIGNED)) {
samlResults.addAll(handlerResults.getActionResults().get(WSConstants.ST_UNSIGNED));
}
if (samlResults.isEmpty()) {
return;
}
List signedResults = new ArrayList<>();
if (handlerResults.getActionResults().containsKey(WSConstants.SIGN)) {
signedResults.addAll(handlerResults.getActionResults().get(WSConstants.SIGN));
}
if (handlerResults.getActionResults().containsKey(WSConstants.UT_SIGN)) {
signedResults.addAll(handlerResults.getActionResults().get(WSConstants.UT_SIGN));
}
for (WSSecurityEngineResult samlResult : samlResults) {
SamlAssertionWrapper assertionWrapper =
(SamlAssertionWrapper)samlResult.get(WSSecurityEngineResult.TAG_SAML_ASSERTION);
if (!checkHolderOfKey(assertionWrapper, signedResults, tlsCerts)) {
LOG.warn("Assertion fails holder-of-key requirements");
throw new WSSecurityException(WSSecurityException.ErrorCode.INVALID_SECURITY);
}
if (!checkSenderVouches(assertionWrapper, tlsCerts, body, signedResults)) {
LOG.warn("Assertion fails sender-vouches requirements");
throw new WSSecurityException(WSSecurityException.ErrorCode.INVALID_SECURITY);
}
}
}
/**
* Check the holder-of-key requirements against the received assertion. The subject
* credential of the SAML Assertion must have been used to sign some portion of
* the message, thus showing proof-of-possession of the private/secret key. Alternatively,
* the subject credential of the SAML Assertion must match a client certificate credential
* when 2-way TLS is used.
* @param assertionWrapper the SAML Assertion wrapper object
* @param signedResults a list of all of the signed results
*/
public static boolean checkHolderOfKey(
SamlAssertionWrapper assertionWrapper,
List signedResults,
Certificate[] tlsCerts
) {
List confirmationMethods = assertionWrapper.getConfirmationMethods();
boolean isHolderOfKey = false;
for (String confirmationMethod : confirmationMethods) {
if (OpenSAMLUtil.isMethodHolderOfKey(confirmationMethod)) {
isHolderOfKey = true;
break;
}
}
if (isHolderOfKey) {
if (tlsCerts == null && (signedResults == null || signedResults.isEmpty())) {
return false;
}
SAMLKeyInfo subjectKeyInfo = assertionWrapper.getSubjectKeyInfo();
if (!compareCredentials(subjectKeyInfo, signedResults, tlsCerts)) {
return false;
}
}
return true;
}
/**
* Compare the credentials of the assertion to the credentials used in 2-way TLS or those
* used to verify signatures.
* Return true on a match
* @param subjectKeyInfo the SAMLKeyInfo object
* @param signedResults a list of all of the signed results
* @return true if the credentials of the assertion were used to verify a signature
*/
public static boolean compareCredentials(
SAMLKeyInfo subjectKeyInfo,
List signedResults,
Certificate[] tlsCerts
) {
X509Certificate[] subjectCerts = subjectKeyInfo.getCerts();
PublicKey subjectPublicKey = subjectKeyInfo.getPublicKey();
byte[] subjectSecretKey = subjectKeyInfo.getSecret();
//
// Try to match the TLS certs first
//
if (tlsCerts != null && tlsCerts.length > 0 && subjectCerts != null
&& subjectCerts.length > 0 && tlsCerts[0].equals(subjectCerts[0])) {
return true;
} else if (tlsCerts != null && tlsCerts.length > 0 && subjectPublicKey != null
&& tlsCerts[0].getPublicKey().equals(subjectPublicKey)) {
return true;
}
if (subjectPublicKey == null && subjectCerts != null && subjectCerts.length > 0) {
subjectPublicKey = subjectCerts[0].getPublicKey();
}
//
// Now try the message-level signatures
//
for (WSSecurityEngineResult signedResult : signedResults) {
X509Certificate[] certs =
(X509Certificate[])signedResult.get(WSSecurityEngineResult.TAG_X509_CERTIFICATES);
PublicKey publicKey =
(PublicKey)signedResult.get(WSSecurityEngineResult.TAG_PUBLIC_KEY);
byte[] secretKey =
(byte[])signedResult.get(WSSecurityEngineResult.TAG_SECRET);
if (certs != null && certs.length > 0 && subjectCerts != null
&& subjectCerts.length > 0 && certs[0].equals(subjectCerts[0])) {
return true;
}
if (publicKey != null && publicKey.equals(subjectPublicKey)) {
return true;
}
if (checkSecretKey(secretKey, subjectSecretKey, signedResult)) {
return true;
}
}
return false;
}
private static boolean checkSecretKey(
byte[] secretKey,
byte[] subjectSecretKey,
WSSecurityEngineResult signedResult
) {
if (secretKey != null && subjectSecretKey != null) {
if (MessageDigest.isEqual(secretKey, subjectSecretKey)) {
return true;
} else {
Principal principal =
(Principal)signedResult.get(WSSecurityEngineResult.TAG_PRINCIPAL);
if (principal instanceof WSDerivedKeyTokenPrincipal) {
secretKey = ((WSDerivedKeyTokenPrincipal)principal).getSecret();
if (MessageDigest.isEqual(secretKey, subjectSecretKey)) {
return true;
}
}
}
}
return false;
}
/**
* Check the sender-vouches requirements against the received assertion. The SAML
* Assertion and the SOAP Body must be signed by the same signature.
*/
public static boolean checkSenderVouches(
SamlAssertionWrapper assertionWrapper,
Certificate[] tlsCerts,
Element body,
List signed
) {
//
// If we have a 2-way TLS connection, then we don't have to check that the
// assertion + SOAP body are signed
//
if (tlsCerts != null && tlsCerts.length > 0) {
return true;
}
List confirmationMethods = assertionWrapper.getConfirmationMethods();
boolean isSenderVouches = false;
for (String confirmationMethod : confirmationMethods) {
if (OpenSAMLUtil.isMethodSenderVouches(confirmationMethod)) {
isSenderVouches = true;
break;
}
}
if (isSenderVouches) {
if (signed == null || signed.isEmpty()) {
return false;
}
if (!checkAssertionAndBodyAreSigned(assertionWrapper, body, signed)) {
return false;
}
}
return true;
}
/**
* Return true if there is a signature which references the Assertion and the SOAP Body.
* @param assertionWrapper the SamlAssertionWrapper object
* @param body The SOAP body
* @param signed The List of signed results
* @return true if there is a signature which references the Assertion and the SOAP Body.
*/
private static boolean checkAssertionAndBodyAreSigned(
SamlAssertionWrapper assertionWrapper,
Element body,
List signed
) {
for (WSSecurityEngineResult signedResult : signed) {
@SuppressWarnings("unchecked")
List sl =
(List)signedResult.get(
WSSecurityEngineResult.TAG_DATA_REF_URIS
);
boolean assertionIsSigned = false;
boolean bodyIsSigned = false;
if (sl != null) {
for (WSDataRef dataRef : sl) {
Element se = dataRef.getProtectedElement();
if (se == assertionWrapper.getElement()) {
assertionIsSigned = true;
}
if (se == body) {
bodyIsSigned = true;
}
if (assertionIsSigned && bodyIsSigned) {
return true;
}
}
}
}
return false;
}
}
