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XMLTooling-J is a low-level library that may be used to construct libraries that allow developers to work with
XML in a Java beans manner.
/*
* Copyright [2006] [University Corporation for Advanced Internet Development, Inc.]
*
* Licensed 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.opensaml.xml.security.x509;
import java.security.cert.X509Certificate;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.security.auth.x500.X500Principal;
import org.opensaml.xml.security.SecurityException;
import org.opensaml.xml.util.DatatypeHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A basic implementaion of {@link X509CredentialNameEvaluator} which evaluates various identifiers
* extracted from an {@link X509Credential}'s entity certificate against a set of trusted names.
*
*
* Supported types of entity certificate-derived names for name checking purposes are:
*
* - Subject alternative names.
* - The first (i.e. most specific) common name (CN) from the subject distinguished name.
* - The complete subject distinguished name.
*
*
*
*
* Name checking is enabled by default for all of the supported name types. The types of subject alternative names to
* process are specified by using the appropriate constant values defined in {@link X509Util}. By default the following
* types of subject alternative names are checked: DNS ({@link X509Util#DNS_ALT_NAME})
* and URI ({@link X509Util#URI_ALT_NAME}).
*
*
*
* The subject distinguished name from the entity certificate is compared to the trusted key names for complete DN
* matching purposes by parsing each trusted key name into an {@link X500Principal} as returned by the configured
* instance of {@link X500DNHandler}. The resulting distinguished name is then compared with the certificate subject
* using {@link X500Principal#equals(Object)}. The default X500DNHandler used is {@link InternalX500DNHandler}.
*
*
*/
public class BasicX509CredentialNameEvaluator implements X509CredentialNameEvaluator {
/** Class logger. */
private final Logger log = LoggerFactory.getLogger(BasicX509CredentialNameEvaluator.class);
/** Flag as to whether to perform name checking using credential's subject alt names. */
private boolean checkSubjectAltNames;
/** Flag as to whether to perform name checking using credential's subject DN's common name (CN). */
private boolean checkSubjectDNCommonName;
/** Flag as to whether to perform name checking using credential's subject DN. */
private boolean checkSubjectDN;
/** The set of types of subject alternative names to process. */
private Set subjectAltNameTypes;
/** Responsible for parsing and serializing X.500 names to/from {@link X500Principal} instances. */
private X500DNHandler x500DNHandler;
/** Constructor. */
public BasicX509CredentialNameEvaluator() {
x500DNHandler = new InternalX500DNHandler();
subjectAltNameTypes = new HashSet(5);
// Add some defaults
setCheckSubjectAltNames(true);
setCheckSubjectDNCommonName(true);
setCheckSubjectDN(true);
subjectAltNameTypes.add(X509Util.DNS_ALT_NAME);
subjectAltNameTypes.add(X509Util.URI_ALT_NAME);
}
/**
* Gets whether any of the supported name type checking is currently enabled.
*
* @return true if any of the supported name type checking categories is currently enabled, false otherwise
*/
public boolean isNameCheckingActive() {
return checkSubjectAltNames() || checkSubjectDNCommonName() || checkSubjectDN();
}
/**
* The set of types of subject alternative names to process.
*
* Name types are represented using the constant OID tag name values defined in {@link X509Util}.
*
*
* @return the modifiable set of alt name identifiers
*/
public Set getSubjectAltNameTypes() {
return subjectAltNameTypes;
}
/**
* Gets whether to check the credential's entity certificate subject alt names against the trusted key
* name values.
*
* @return whether to check the credential's entity certificate subject alt names against the trusted key
* names
*/
public boolean checkSubjectAltNames() {
return checkSubjectAltNames;
}
/**
* Sets whether to check the credential's entity certificate subject alt names against the trusted key
* name values.
*
* @param check whether to check the credential's entity certificate subject alt names against the trusted
* key names
*/
public void setCheckSubjectAltNames(boolean check) {
checkSubjectAltNames = check;
}
/**
* Gets whether to check the credential's entity certificate subject DN's common name (CN) against the
* trusted key name values.
*
* @return whether to check the credential's entity certificate subject DN's CN against the trusted key
* names
*/
public boolean checkSubjectDNCommonName() {
return checkSubjectDNCommonName;
}
/**
* Sets whether to check the credential's entity certificate subject DN's common name (CN) against the
* trusted key name values.
*
* @param check whether to check the credential's entity certificate subject DN's CN against the trusted
* key names
*/
public void setCheckSubjectDNCommonName(boolean check) {
checkSubjectDNCommonName = check;
}
/**
* Gets whether to check the credential's entity certificate subject DN against the trusted key name
* values.
*
* @return whether to check the credential's entity certificate subject DN against the trusted key names
*/
public boolean checkSubjectDN() {
return checkSubjectDN;
}
/**
* Sets whether to check the credential's entity certificate subject DN against the trusted key name
* values.
*
* @param check whether to check the credential's entity certificate subject DN against the trusted key
* names
*/
public void setCheckSubjectDN(boolean check) {
checkSubjectDN = check;
}
/**
* Get the handler which process X.500 distinguished names.
*
* Defaults to {@link InternalX500DNHandler}.
*
* @return returns the X500DNHandler instance
*/
public X500DNHandler getX500DNHandler() {
return x500DNHandler;
}
/**
* Set the handler which process X.500 distinguished names.
*
* Defaults to {@link InternalX500DNHandler}.
*
* @param handler the new X500DNHandler instance
*/
public void setX500DNHandler(X500DNHandler handler) {
if (handler == null) {
throw new IllegalArgumentException("X500DNHandler may not be null");
}
x500DNHandler = handler;
}
/**
* {@inheritDoc}
*
*
* If the set of trusted names is null or empty, or if no supported name types are configured to be
* checked, then the evaluation is considered successful.
*
*
*/
@SuppressWarnings("unchecked")
public boolean evaluate(X509Credential credential, Set trustedNames) throws SecurityException {
if (!isNameCheckingActive()) {
log.debug("No trusted name options are active, skipping name evaluation");
return true;
} else if (trustedNames == null || trustedNames.isEmpty()) {
log.debug("Supplied trusted names are null or empty, skipping name evaluation");
return true;
}
if (log.isDebugEnabled()) {
log.debug("Checking trusted names against credential: {}",
X509Util.getIdentifiersToken(credential, x500DNHandler));
log.debug("Trusted names being evaluated are: {}",
trustedNames.toString());
}
return processNameChecks(credential, trustedNames);
}
/**
* Process any name checks that are enabled.
*
* @param credential the credential for the entity to validate
* @param trustedNames trusted names against which the credential will be evaluated
* @return if true the name check succeeds, false if not
*/
protected boolean processNameChecks(X509Credential credential, Set trustedNames) {
X509Certificate entityCertificate = credential.getEntityCertificate();
if (checkSubjectAltNames()) {
if (processSubjectAltNames(entityCertificate, trustedNames)) {
if (log.isDebugEnabled()) {
log.debug("Credential {} passed name check based on subject alt names.",
X509Util.getIdentifiersToken(credential, x500DNHandler));
}
return true;
}
}
if (checkSubjectDNCommonName()) {
if (processSubjectDNCommonName(entityCertificate, trustedNames)) {
if (log.isDebugEnabled()) {
log.debug("Credential {} passed name check based on subject common name.",
X509Util.getIdentifiersToken(credential, x500DNHandler));
}
return true;
}
}
if (checkSubjectDN()) {
if (processSubjectDN(entityCertificate, trustedNames)) {
if (log.isDebugEnabled()) {
log.debug("Credential {} passed name check based on subject DN.",
X509Util.getIdentifiersToken(credential, x500DNHandler));
}
return true;
}
}
log.error("Credential failed name check: "
+ X509Util.getIdentifiersToken(credential, x500DNHandler));
return false;
}
/**
* Process name checking for a certificate subject DN's common name.
*
* @param certificate the certificate to process
* @param trustedNames the set of trusted names
*
* @return true if the subject DN common name matches the set of trusted names, false otherwise
*
*/
protected boolean processSubjectDNCommonName(X509Certificate certificate, Set trustedNames) {
log.debug("Processing subject DN common name");
X500Principal subjectPrincipal = certificate.getSubjectX500Principal();
List commonNames = X509Util.getCommonNames(subjectPrincipal);
if (commonNames == null || commonNames.isEmpty()) {
return false;
}
// TODO We only check the first one returned by X509Util. Maybe we should check all,
// if there are multiple CN AVA's from the same (first) RDN.
String commonName = commonNames.get(0);
log.debug("Extracted common name from certificate: {}", commonName);
if (DatatypeHelper.isEmpty(commonName)) {
return false;
}
if (trustedNames.contains(commonName)) {
log.debug("Matched subject DN common name to trusted names: {}", commonName);
return true;
} else {
return false;
}
}
/**
* Process name checking for the certificate subject DN.
*
* @param certificate the certificate to process
* @param trustedNames the set of trusted names
*
* @return true if the subject DN matches the set of trusted names, false otherwise
*/
protected boolean processSubjectDN(X509Certificate certificate, Set trustedNames) {
log.debug("Processing subject DN");
X500Principal subjectPrincipal = certificate.getSubjectX500Principal();
if (log.isDebugEnabled()) {
log.debug("Extracted X500Principal from certificate: {}", x500DNHandler.getName(subjectPrincipal));
}
for (String trustedName : trustedNames) {
X500Principal trustedNamePrincipal = null;
try {
trustedNamePrincipal = x500DNHandler.parse(trustedName);
log.debug("Evaluating principal successfully parsed from trusted name: {}", trustedName);
if (subjectPrincipal.equals(trustedNamePrincipal)) {
if (log.isDebugEnabled()) {
log.debug("Matched subject DN to trusted names: {}", x500DNHandler.getName(subjectPrincipal));
}
return true;
}
} catch (IllegalArgumentException e) {
// Do nothing, probably wasn't a distinguished name.
// TODO maybe try and match only the "suspected" DN values above
// - maybe match with regex for '='or something
log.debug("Trusted name was not a DN or could not be parsed: {}", trustedName);
continue;
}
}
return false;
}
/**
* Process name checking for the subject alt names within the certificate.
*
* @param certificate the certificate to process
* @param trustedNames the set of trusted names
*
* @return true if one of the subject alt names matches the set of trusted names, false otherwise
*/
protected boolean processSubjectAltNames(X509Certificate certificate, Set trustedNames) {
log.debug("Processing subject alt names");
Integer[] nameTypes = new Integer[subjectAltNameTypes.size()];
subjectAltNameTypes.toArray(nameTypes);
List altNames = X509Util.getAltNames(certificate, nameTypes);
log.debug("Extracted subject alt names from certificate: {}", altNames);
for (Object altName : altNames) {
if (trustedNames.contains(altName)) {
log.debug("Matched subject alt name to trusted names: {}", altName.toString());
return true;
}
}
return false;
}
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