InstallCert.java

/*
 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */
/**
 * Originally from: http://blogs.sun.com/andreas/resource/InstallCert.java Use: java InstallCert
 * hostname Example: % java InstallCert ecc.fedora.redhat.com
 */
import java.net.Proxy;
import java.net.Socket;
import java.net.InetSocketAddress;
import javax.net.ssl.*;
import java.io.*;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/** Class used to add the server's certificate to the KeyStore with your trusted certificates. */
public class InstallCert {

  public static void main(String[] args) throws Exception {

    String host = null;
    int port = -1;
    char[] passphrase = null;

    // proxy
    boolean useProxy = false;
    String proxyHost = null;
    int proxyPort = -1;
    InetSocketAddress proxyAddr = null;
    Socket underlying = null;

    int numArg = 0;
    int nbArgs = args.length;
    boolean invalidArgs = false;
    boolean isQuiet = false;
    while (numArg < nbArgs) {
      String arg = args[numArg++];
      if (arg.startsWith("--proxy=")) {
        String proxy = arg.substring("--proxy=".length());
        useProxy = true;
        String[] c = proxy.split(":");
        proxyHost = c[0];
        proxyPort = Integer.parseInt(c[1]); // proxy port is mandatory (we don't default to 8080)
      } else if (arg.startsWith("--quiet")) {
        isQuiet = true;
      } else if (host == null) { // 1st argument is the "host:port"
        String[] c = arg.split(":");
        host = c[0];
        port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
      } else if (passphrase == null) { //  2nd argument is the keystore passphrase
        passphrase = arg.toCharArray();
      } else {
        invalidArgs = true; // too many args
      }
    }

    if (host == null) {
      invalidArgs = true;
    }

    if (invalidArgs) {
      System.out.println(
          "Usage: java InstallCert [--proxy=proxyHost:proxyPort] host[:port] [passphrase] [--quiet]");
      return;
    }

    // default values
    if (port == -1) {
      port = 443;
    }
    if (passphrase == null) {
      passphrase = "changeit".toCharArray();
    }

    File file = new File("jssecacerts");
    if (file.isFile() == false) {
      char SEP = File.separatorChar;
      File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");
      file = new File(dir, "jssecacerts");
      if (file.isFile() == false) {
        file = new File(dir, "cacerts");
      }
    }
    System.out.println("Loading KeyStore " + file + "...");
    InputStream in = new FileInputStream(file);
    KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
    ks.load(in, passphrase);
    in.close();

    if (useProxy) {
      proxyAddr = new InetSocketAddress(proxyHost, proxyPort);
      underlying = new Socket(new Proxy(Proxy.Type.HTTP, proxyAddr));
    }

    SSLContext context = SSLContext.getInstance("TLS");
    TrustManagerFactory tmf =
        TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
    tmf.init(ks);
    X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
    SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
    context.init(null, new TrustManager[] {tm}, null);
    SSLSocketFactory factory = context.getSocketFactory();

    System.out.println(
        "Opening connection to "
            + host
            + ":"
            + port
            + (useProxy ? (" via proxy " + proxyHost + ":" + proxyPort) : "")
            + " ...");
    SSLSocket socket;
    if (useProxy) {
      underlying.connect(new InetSocketAddress(host, port));
      socket = (SSLSocket) factory.createSocket(underlying, host, port, true);
    } else {
      socket = (SSLSocket) factory.createSocket(host, port);
    }
    socket.setSoTimeout(10000);
    try {
      System.out.println("Starting SSL handshake...");
      socket.startHandshake();
      socket.close();
      System.out.println();
      System.out.println("No errors, certificate is already trusted");
    } catch (SSLException e) {
      System.out.println();
      e.printStackTrace(System.out);
    }

    X509Certificate[] chain = tm.chain;
    if (chain == null) {
      System.out.println("Could not obtain server certificate chain");
      return;
    }

    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

    System.out.println();
    System.out.println("Server sent " + chain.length + " certificate(s):");
    System.out.println();
    MessageDigest sha1 = MessageDigest.getInstance("SHA1");
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    for (int i = 0; i < chain.length; i++) {
      X509Certificate cert = chain[i];
      System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
      System.out.println("   Issuer  " + cert.getIssuerDN());
      sha1.update(cert.getEncoded());
      System.out.println("   sha1    " + toHexString(sha1.digest()));
      md5.update(cert.getEncoded());
      System.out.println("   md5     " + toHexString(md5.digest()));
      System.out.println();
    }

    int k;
    if (isQuiet) {
      System.out.println("Adding first certificate to trusted keystore");
      k = 0;
    } else {
      System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
      String line = reader.readLine().trim();
      try {
        k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
      } catch (NumberFormatException e) {
        System.out.println("KeyStore not changed");
        return;
      }
    }

    X509Certificate cert = chain[k];
    String alias = host + "-" + (k + 1);
    ks.setCertificateEntry(alias, cert);

    OutputStream out = new FileOutputStream("jssecacerts");
    ks.store(out, passphrase);
    out.close();

    System.out.println();
    System.out.println(cert);
    System.out.println();
    System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");
  }

  private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();

  private static String toHexString(byte[] bytes) {
    StringBuilder sb = new StringBuilder(bytes.length * 3);
    for (int b : bytes) {
      b &= 0xff;
      sb.append(HEXDIGITS[b >> 4]);
      sb.append(HEXDIGITS[b & 15]);
      sb.append(' ');
    }
    return sb.toString();
  }

  private static class SavingTrustManager implements X509TrustManager {

    private final X509TrustManager tm;
    private X509Certificate[] chain;

    SavingTrustManager(X509TrustManager tm) {
      this.tm = tm;
    }

    public X509Certificate[] getAcceptedIssuers() {
      // This change has been done due to the following resolution advised for Java 1.7+
      // http://infposs.blogspot.kr/2013/06/installcert-and-java-7.html
      return new X509Certificate[0];
      // throw new UnsupportedOperationException();
    }

    public void checkClientTrusted(X509Certificate[] chain, String authType)
        throws CertificateException {
      throw new UnsupportedOperationException();
    }

    public void checkServerTrusted(X509Certificate[] chain, String authType)
        throws CertificateException {
      this.chain = chain;
      tm.checkServerTrusted(chain, authType);
    }
  }
}