88 lines
2.7 KiB
Java
88 lines
2.7 KiB
Java
/**
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* Copyright (C) 2014 Open Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.whispersystems.textsecure.util;
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import java.math.BigInteger;
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import java.security.cert.CertificateException;
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import java.security.cert.X509Certificate;
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import java.util.LinkedList;
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import java.util.List;
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import javax.net.ssl.TrustManager;
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import javax.net.ssl.X509TrustManager;
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/**
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* Trust manager that defers to a system X509 trust manager, and
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* additionally rejects certificates if they have a blacklisted
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* serial.
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*
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* @author Moxie Marlinspike
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*/
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public class BlacklistingTrustManager implements X509TrustManager {
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private static final List<BigInteger> BLACKLIST = new LinkedList<BigInteger>() {{
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add(new BigInteger("4098"));
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}};
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public static TrustManager[] createFor(TrustManager[] trustManagers) {
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for (TrustManager trustManager : trustManagers) {
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if (trustManager instanceof X509TrustManager) {
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TrustManager[] results = new BlacklistingTrustManager[1];
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results[0] = new BlacklistingTrustManager((X509TrustManager)trustManager);
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return results;
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}
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}
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throw new AssertionError("No X509 Trust Managers!");
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}
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private final X509TrustManager trustManager;
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public BlacklistingTrustManager(X509TrustManager trustManager) {
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this.trustManager = trustManager;
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}
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@Override
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public void checkClientTrusted(X509Certificate[] chain, String authType)
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throws CertificateException
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{
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trustManager.checkClientTrusted(chain, authType);
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}
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@Override
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public void checkServerTrusted(X509Certificate[] chain, String authType)
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throws CertificateException
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{
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trustManager.checkServerTrusted(chain, authType);
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for (X509Certificate certificate : chain) {
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for (BigInteger blacklistedSerial : BLACKLIST) {
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if (certificate.getSerialNumber().equals(blacklistedSerial)) {
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throw new CertificateException("Blacklisted Serial: " + certificate.getSerialNumber());
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}
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}
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}
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}
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@Override
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public X509Certificate[] getAcceptedIssuers() {
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return trustManager.getAcceptedIssuers();
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}
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}
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