org.springframework.security.web.authentication.preauth.x509.SubjectDnX509PrincipalExtractor Maven / Gradle / Ivy
/*
* Copyright 2002-2016 the original author or authors.
*
* 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.springframework.security.web.authentication.preauth.x509;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.core.SpringSecurityMessageSource;
import org.springframework.util.Assert;
import org.springframework.context.support.MessageSourceAccessor;
import org.springframework.context.MessageSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.security.cert.X509Certificate;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
/**
* Obtains the principal from a certificate using a regular expression match against the
* Subject (as returned by a call to {@link X509Certificate#getSubjectDN()}).
*
* The regular expression should contain a single group; for example the default
* expression "CN=(.*?)(?:,|$)" matches the common name field. So
* "CN=Jimi Hendrix, OU=..." will give a user name of "Jimi Hendrix".
*
* The matches are case insensitive. So "emailAddress=(.*?)," will match
* "[email protected], CN=..." giving a user name "[email protected]"
*
* @author Luke Taylor
*/
public class SubjectDnX509PrincipalExtractor implements X509PrincipalExtractor {
// ~ Instance fields
// ================================================================================================
protected final Log logger = LogFactory.getLog(getClass());
protected MessageSourceAccessor messages = SpringSecurityMessageSource.getAccessor();
private Pattern subjectDnPattern;
public SubjectDnX509PrincipalExtractor() {
setSubjectDnRegex("CN=(.*?)(?:,|$)");
}
public Object extractPrincipal(X509Certificate clientCert) {
// String subjectDN = clientCert.getSubjectX500Principal().getName();
String subjectDN = clientCert.getSubjectDN().getName();
logger.debug("Subject DN is '" + subjectDN + "'");
Matcher matcher = subjectDnPattern.matcher(subjectDN);
if (!matcher.find()) {
throw new BadCredentialsException(messages.getMessage(
"SubjectDnX509PrincipalExtractor.noMatching",
new Object[] { subjectDN },
"No matching pattern was found in subject DN: {0}"));
}
if (matcher.groupCount() != 1) {
throw new IllegalArgumentException(
"Regular expression must contain a single group ");
}
String username = matcher.group(1);
logger.debug("Extracted Principal name is '" + username + "'");
return username;
}
/**
* Sets the regular expression which will by used to extract the user name from the
* certificate's Subject DN.
*
* It should contain a single group; for example the default expression
* "CN=(.*?)(?:,|$)" matches the common name field. So "CN=Jimi Hendrix, OU=..." will
* give a user name of "Jimi Hendrix".
*
* The matches are case insensitive. So "emailAddress=(.?)," will match
* "[email protected], CN=..." giving a user name "[email protected]"
*
* @param subjectDnRegex the regular expression to find in the subject
*/
public void setSubjectDnRegex(String subjectDnRegex) {
Assert.hasText(subjectDnRegex, "Regular expression may not be null or empty");
subjectDnPattern = Pattern.compile(subjectDnRegex, Pattern.CASE_INSENSITIVE);
}
public void setMessageSource(MessageSource messageSource) {
this.messages = new MessageSourceAccessor(messageSource);
}
}