/**
* 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.sts.token.realm;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.apache.cxf.common.logging.LogUtils;
/**
* This class provides the functionality to match a given X509Certificate against a list of
* regular expressions.
*/
public class CertConstraintsParser {
private static final Logger LOG = LogUtils.getL7dLogger(CertConstraintsParser.class);
/**
* a collection of compiled regular expression patterns for the subject DN
*/
private Collection<Pattern> subjectDNPatterns = new ArrayList<>();
/**
* Set a list of Strings corresponding to regular expression constraints on the subject DN
* of a certificate
*/
public void setSubjectConstraints(List<String> constraints) {
if (constraints != null) {
subjectDNPatterns = new ArrayList<>();
for (String constraint : constraints) {
try {
subjectDNPatterns.add(Pattern.compile(constraint.trim()));
} catch (PatternSyntaxException ex) {
LOG.severe(ex.getMessage());
throw ex;
}
}
}
}
public Collection<Pattern> getCompiledSubjectContraints() {
return subjectDNPatterns;
}
/**
* @return true if the certificate's SubjectDN matches the constraints defined in the
* subject DNConstraints; false, otherwise. The certificate subject DN only
* has to match ONE of the subject cert constraints (not all).
*/
public boolean matches(
final java.security.cert.X509Certificate cert
) {
if (!subjectDNPatterns.isEmpty()) {
if (cert == null) {
LOG.fine("The certificate is null so no constraints matching was possible");
return false;
}
String subjectName = cert.getSubjectX500Principal().getName();
boolean subjectMatch = false;
for (Pattern subjectDNPattern : subjectDNPatterns) {
final Matcher matcher = subjectDNPattern.matcher(subjectName);
if (matcher.matches()) {
if (LOG.isLoggable(Level.FINE)) {
LOG.fine("Subject DN " + subjectName + " matches with pattern " + subjectDNPattern);
}
subjectMatch = true;
break;
}
}
if (!subjectMatch) {
return false;
}
}
return true;
}
}