Android Open Source - wototoplayer Ok Hostname Verifier

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License

The source code is released under:

Copyright (c) 2015, Chris Greenhalgh All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met...

Java Source Code

/*
 *  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
 */*www. jav  a  2 s  .c  om*/
 *     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 com.squareup.okhttp.internal.tls;

import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.security.auth.x500.X500Principal;

/**
 * A HostnameVerifier consistent with <a
 * href="http://www.ietf.org/rfc/rfc2818.txt">RFC 2818</a>.
 */
public final class OkHostnameVerifier implements HostnameVerifier {
  public static final OkHostnameVerifier INSTANCE = new OkHostnameVerifier();

  /**
   * Quick and dirty pattern to differentiate IP addresses from hostnames. This
   * is an approximation of Android's private InetAddress#isNumeric API.
   *
   * <p>This matches IPv6 addresses as a hex string containing at least one
   * colon, and possibly including dots after the first colon. It matches IPv4
   * addresses as strings containing only decimal digits and dots. This pattern
   * matches strings like "a:.23" and "54" that are neither IP addresses nor
   * hostnames; they will be verified as IP addresses (which is a more strict
   * verification).
   */
  private static final Pattern VERIFY_AS_IP_ADDRESS = Pattern.compile(
      "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)");

  private static final int ALT_DNS_NAME = 2;
  private static final int ALT_IPA_NAME = 7;

  private OkHostnameVerifier() {
  }

  public boolean verify(String host, SSLSession session) {
    try {
      Certificate[] certificates = session.getPeerCertificates();
      return verify(host, (X509Certificate) certificates[0]);
    } catch (SSLException e) {
      return false;
    }
  }

  public boolean verify(String host, X509Certificate certificate) {
    return verifyAsIpAddress(host)
        ? verifyIpAddress(host, certificate)
        : verifyHostName(host, certificate);
  }

  static boolean verifyAsIpAddress(String host) {
    return VERIFY_AS_IP_ADDRESS.matcher(host).matches();
  }

  /**
   * Returns true if {@code certificate} matches {@code ipAddress}.
   */
  private boolean verifyIpAddress(String ipAddress, X509Certificate certificate) {
    for (String altName : getSubjectAltNames(certificate, ALT_IPA_NAME)) {
      if (ipAddress.equalsIgnoreCase(altName)) {
        return true;
      }
    }
    return false;
  }

  /**
   * Returns true if {@code certificate} matches {@code hostName}.
   */
  private boolean verifyHostName(String hostName, X509Certificate certificate) {
    hostName = hostName.toLowerCase(Locale.US);
    boolean hasDns = false;
    for (String altName : getSubjectAltNames(certificate, ALT_DNS_NAME)) {
      hasDns = true;
      if (verifyHostName(hostName, altName)) {
        return true;
      }
    }

    if (!hasDns) {
      X500Principal principal = certificate.getSubjectX500Principal();
      // RFC 2818 advises using the most specific name for matching.
      String cn = new DistinguishedNameParser(principal).findMostSpecific("cn");
      if (cn != null) {
        return verifyHostName(hostName, cn);
      }
    }

    return false;
  }

  private List<String> getSubjectAltNames(X509Certificate certificate, int type) {
    List<String> result = new ArrayList<String>();
    try {
      Collection<?> subjectAltNames = certificate.getSubjectAlternativeNames();
      if (subjectAltNames == null) {
        return Collections.emptyList();
      }
      for (Object subjectAltName : subjectAltNames) {
        List<?> entry = (List<?>) subjectAltName;
        if (entry == null || entry.size() < 2) {
          continue;
        }
        Integer altNameType = (Integer) entry.get(0);
        if (altNameType == null) {
          continue;
        }
        if (altNameType == type) {
          String altName = (String) entry.get(1);
          if (altName != null) {
            result.add(altName);
          }
        }
      }
      return result;
    } catch (CertificateParsingException e) {
      return Collections.emptyList();
    }
  }

  /**
   * Returns true if {@code hostName} matches the name or pattern {@code cn}.
   *
   * @param hostName lowercase host name.
   * @param cn certificate host name. May include wildcards like
   *     {@code *.android.com}.
   */
  public boolean verifyHostName(String hostName, String cn) {
    // Check length == 0 instead of .isEmpty() to support Java 5.
    if (hostName == null || hostName.length() == 0 || cn == null || cn.length() == 0) {
      return false;
    }

    cn = cn.toLowerCase(Locale.US);

    if (!cn.contains("*")) {
      return hostName.equals(cn);
    }

    if (cn.startsWith("*.") && hostName.regionMatches(0, cn, 2, cn.length() - 2)) {
      return true; // "*.foo.com" matches "foo.com"
    }

    int asterisk = cn.indexOf('*');
    int dot = cn.indexOf('.');
    if (asterisk > dot) {
      return false; // malformed; wildcard must be in the first part of the cn
    }

    if (!hostName.regionMatches(0, cn, 0, asterisk)) {
      return false; // prefix before '*' doesn't match
    }

    int suffixLength = cn.length() - (asterisk + 1);
    int suffixStart = hostName.length() - suffixLength;
    if (hostName.indexOf('.', asterisk) < suffixStart) {
      // TODO: remove workaround for *.clients.google.com http://b/5426333
      if (!hostName.endsWith(".clients.google.com")) {
        return false; // wildcard '*' can't match a '.'
      }
    }

    if (!hostName.regionMatches(suffixStart, cn, asterisk + 1, suffixLength)) {
      return false; // suffix after '*' doesn't match
    }

    return true;
  }
}

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