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The Netty project is an effort to provide an asynchronous event-driven
network application framework and tools for rapid development of
maintainable high performance and high scalability protocol servers and
clients. In other words, Netty is a NIO client server framework which
enables quick and easy development of network applications such as protocol
servers and clients. It greatly simplifies and streamlines network
programming such as TCP and UDP socket server.
/*
* Copyright 2014 The Netty Project
*
* The Netty Project 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.jboss.netty.handler.ssl.util;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.util.internal.EmptyArrays;
import javax.net.ssl.ManagerFactoryParameters;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
/**
* An {@link TrustManagerFactory} that trusts an X.509 certificate whose SHA1 checksum matches.
*
* NOTE:
* Never use this {@link TrustManagerFactory} in production unless you are not sure what you are exactly doing with it.
*
* The SHA1 checksum of an X.509 certificate is calculated from its DER encoded format. You can get the fingerprint of
* an X.509 certificate using the {@code openssl} command. For example:
*
* $ openssl x509 -fingerprint -sha1 -in my_certificate.crt
* SHA1 Fingerprint=4E:85:10:55:BC:7B:12:08:D1:EA:0A:12:C9:72:EE:F3:AA:B2:C7:CB
* -----BEGIN CERTIFICATE-----
* MIIBqjCCAROgAwIBAgIJALiT3Nvp0kvmMA0GCSqGSIb3DQEBBQUAMBYxFDASBgNV
* BAMTC2V4YW1wbGUuY29tMCAXDTcwMDEwMTAwMDAwMFoYDzk5OTkxMjMxMjM1OTU5
* WjAWMRQwEgYDVQQDEwtleGFtcGxlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAw
* gYkCgYEAnadvODG0QCiHhaFZlLHtr5gLIkDQS8ErZ//KfqeCHTC/KJsl3xYFk0zG
* aCv2FcmkOlokm77qV8qOW2DZdND7WuYzX6nLVuLb+GYxZ7b45iMAbAajvGh8jc9U
* o07fUIahGqTDAIAGCWsoLUOQ9nMzO/8GRHcXJAeQ2MGY2VpCcv0CAwEAATANBgkq
* hkiG9w0BAQUFAAOBgQBpRCnmjmNM0D7yrpkUJpBTNiqinhKLbeOvPWm+YmdInUUs
* LoMu0mZ1IANemLwqbwJJ76fknngeB+YuVAj46SurvVCV6ekwHcbgpW1u063IRwKk
* tQhOBO0HQxldUS4+4MYv/kuvnKkbjfgh5qfWw89Kx4kD+cycpP4yPtgDGk8ZMA==
* -----END CERTIFICATE-----
*
*
*/
public final class FingerprintTrustManagerFactory extends SimpleTrustManagerFactory {
private static final Pattern FINGERPRINT_PATTERN = Pattern.compile("^[0-9a-fA-F:]+$");
private static final Pattern FINGERPRINT_STRIP_PATTERN = Pattern.compile(":");
private static final int SHA1_BYTE_LEN = 20;
private static final int SHA1_HEX_LEN = SHA1_BYTE_LEN * 2;
private static final ThreadLocal tlmd = new ThreadLocal() {
@Override
protected MessageDigest initialValue() {
try {
return MessageDigest.getInstance("SHA1");
} catch (NoSuchAlgorithmException e) {
// All Java implementation must have SHA1 digest algorithm.
throw new Error(e);
}
}
};
private final TrustManager tm = new X509TrustManager() {
public void checkClientTrusted(X509Certificate[] chain, String s) throws CertificateException {
checkTrusted("client", chain);
}
public void checkServerTrusted(X509Certificate[] chain, String s) throws CertificateException {
checkTrusted("server", chain);
}
private void checkTrusted(String type, X509Certificate[] chain) throws CertificateException {
X509Certificate cert = chain[0];
byte[] fingerprint = fingerprint(cert);
boolean found = false;
for (byte[] allowedFingerprint: fingerprints) {
if (Arrays.equals(fingerprint, allowedFingerprint)) {
found = true;
break;
}
}
if (!found) {
throw new CertificateException(
type + " certificate with unknown fingerprint: " + cert.getSubjectDN());
}
}
private byte[] fingerprint(X509Certificate cert) throws CertificateEncodingException {
MessageDigest md = tlmd.get();
md.reset();
return md.digest(cert.getEncoded());
}
public X509Certificate[] getAcceptedIssuers() {
return EmptyArrays.EMPTY_X509_CERTIFICATES;
}
};
private final byte[][] fingerprints;
/**
* Creates a new instance.
*
* @param fingerprints a list of SHA1 fingerprints in heaxdecimal form
*/
public FingerprintTrustManagerFactory(Iterable fingerprints) {
this(toFingerprintArray(fingerprints));
}
/**
* Creates a new instance.
*
* @param fingerprints a list of SHA1 fingerprints in heaxdecimal form
*/
public FingerprintTrustManagerFactory(String... fingerprints) {
this(toFingerprintArray(Arrays.asList(fingerprints)));
}
/**
* Creates a new instance.
*
* @param fingerprints a list of SHA1 fingerprints
*/
public FingerprintTrustManagerFactory(byte[]... fingerprints) {
if (fingerprints == null) {
throw new NullPointerException("fingerprints");
}
List list = new ArrayList();
for (byte[] f: fingerprints) {
if (f == null) {
break;
}
if (f.length != SHA1_BYTE_LEN) {
throw new IllegalArgumentException("malformed fingerprint: " +
ChannelBuffers.hexDump(ChannelBuffers.wrappedBuffer(f)) + " (expected: SHA1)");
}
list.add(f.clone());
}
this.fingerprints = list.toArray(new byte[list.size()][]);
}
private static byte[][] toFingerprintArray(Iterable fingerprints) {
if (fingerprints == null) {
throw new NullPointerException("fingerprints");
}
List list = new ArrayList();
for (String f: fingerprints) {
if (f == null) {
break;
}
if (!FINGERPRINT_PATTERN.matcher(f).matches()) {
throw new IllegalArgumentException("malformed fingerprint: " + f);
}
f = FINGERPRINT_STRIP_PATTERN.matcher(f).replaceAll("");
if (f.length() != SHA1_HEX_LEN) {
throw new IllegalArgumentException("malformed fingerprint: " + f + " (expected: SHA1)");
}
byte[] farr = new byte[SHA1_BYTE_LEN];
for (int i = 0; i < farr.length; i ++) {
int strIdx = i << 1;
farr[i] = (byte) Integer.parseInt(f.substring(strIdx, strIdx + 2), 16);
}
}
return list.toArray(new byte[list.size()][]);
}
@Override
protected void engineInit(KeyStore keyStore) throws Exception { }
@Override
protected void engineInit(ManagerFactoryParameters managerFactoryParameters) throws Exception { }
@Override
protected TrustManager[] engineGetTrustManagers() {
return new TrustManager[] { tm };
}
}