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Smack/source/org/jivesoftware/smack/ServerTrustManager.java

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/**
* $RCSfile$
* $Revision: $
* $Date: $
*
* Copyright 2003-2005 Jive Software.
*
* All rights reserved. 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.jivesoftware.smack;
import javax.net.ssl.X509TrustManager;
import java.io.FileInputStream;
import java.security.*;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Date;
/**
* Trust manager that checks all certificates presented by the server. This class
* is used during TLS negotiation. It is possible to disable/enable some or all checkings
* by configuring the {@link ConnectionConfiguration}. The truststore file that contains
* knows and trusted CA root certificates can also be configure in {@link ConnectionConfiguration}.
*
* @author Gaston Dombiak
*/
class ServerTrustManager implements X509TrustManager {
private ConnectionConfiguration configuration;
/**
* Holds the domain of the remote server we are trying to connect
*/
private String server;
private KeyStore trustStore;
public ServerTrustManager(String server, ConnectionConfiguration configuration) {
this.configuration = configuration;
this.server = server;
try {
trustStore = KeyStore.getInstance(configuration.getTruststoreType());
trustStore.load(new FileInputStream(configuration.getTruststorePath()),
configuration.getTruststorePassword().toCharArray());
}
catch (Exception e) {
e.printStackTrace();
// Disable root CA checking
configuration.setVerifyRootCAEnabled(false);
}
}
public X509Certificate[] getAcceptedIssuers() {
return new X509Certificate[0];
}
public void checkClientTrusted(X509Certificate[] arg0, String arg1)
throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] x509Certificates, String arg1)
throws CertificateException {
int nSize = x509Certificates.length;
String peerIdentity = getPeerIdentity(x509Certificates[0]);
if (configuration.isVerifyChainEnabled()) {
// Working down the chain, for every certificate in the chain,
// verify that the subject of the certificate is the issuer of the
// next certificate in the chain.
Principal principalLast = null;
for (int i = nSize -1; i >= 0 ; i--) {
X509Certificate x509certificate = x509Certificates[i];
Principal principalIssuer = x509certificate.getIssuerDN();
Principal principalSubject = x509certificate.getSubjectDN();
if (principalLast != null) {
if (principalIssuer.equals(principalLast)) {
try {
PublicKey publickey =
x509Certificates[i + 1].getPublicKey();
x509Certificates[i].verify(publickey);
}
catch (GeneralSecurityException generalsecurityexception) {
throw new CertificateException(
"signature verification failed of " + peerIdentity);
}
}
else {
throw new CertificateException(
"subject/issuer verification failed of " + peerIdentity);
}
}
principalLast = principalSubject;
}
}
if (configuration.isVerifyRootCAEnabled()) {
// Verify that the the last certificate in the chain was issued
// by a third-party that the client trusts.
boolean trusted = false;
try {
trusted = trustStore.getCertificateAlias(x509Certificates[nSize - 1]) != null;
if (!trusted && nSize == 1 && configuration.isSelfSignedCertificateEnabled())
{
System.out.println("Accepting self-signed certificate of remote server: " +
peerIdentity);
trusted = true;
}
}
catch (KeyStoreException e) {
e.printStackTrace();
}
if (!trusted) {
throw new CertificateException("root certificate not trusted of " + peerIdentity);
}
}
if (configuration.isNotMatchingDomainCheckEnabled()) {
// Verify that the first certificate in the chain corresponds to
// the server we desire to authenticate.
// Check if the certificate uses a wildcard indicating that subdomains are valid
if (peerIdentity.startsWith("*.")) {
// Remove the wildcard
peerIdentity = peerIdentity.substring(2);
// Check if the requested subdomain matches the certified domain
if (!server.endsWith(peerIdentity)) {
throw new CertificateException("target verification failed of " + peerIdentity);
}
}
else if (!server.equals(peerIdentity)) {
throw new CertificateException("target verification failed of " + peerIdentity);
}
}
if (configuration.isExpiredCertificatesCheckEnabled()) {
// For every certificate in the chain, verify that the certificate
// is valid at the current time.
Date date = new Date();
for (int i = 0; i < nSize; i++) {
try {
x509Certificates[i].checkValidity(date);
}
catch (GeneralSecurityException generalsecurityexception) {
throw new CertificateException("invalid date of " + server);
}
}
}
}
/**
* Returns the identity of the remote server as defined in the specified certificate. The
* identity is defined in the subjectDN of the certificate and it can also be defined in
* the subjectAltName extension of type "xmpp". When the extension is being used then the
* identity defined in the extension in going to be returned. Otherwise, the value stored in
* the subjectDN is returned.
*
* @param x509Certificate the certificate the holds the identity of the remote server.
* @return the identity of the remote server as defined in the specified certificate.
*/
public static String getPeerIdentity(X509Certificate x509Certificate) {
Principal principalSubject = x509Certificate.getSubjectDN();
// TODO Look the identity in the subjectAltName extension if available
String name = principalSubject.getName();
if (name.startsWith("CN=")) {
// Remove the CN= prefix
name = name.substring(3);
}
return name;
}
}