InstallCert

InstallCert.java

package com.thjug.tools.sslcert;

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;

/**
 * Default cert path : $JAVA_HOME\jre\lib\security
 * @author nuboat
 */
public class InstallCert {

    public static void main(final String[] args) throws Exception {
		final String host = "facebook.com";
		final int port = 443;
		final char[] passphrase = "changeit".toCharArray();
		final String source = "./src/main/resources/cacerts";
		final String output = "./src/main/resources/jssecacerts";
		final char[] outputpassphase = "changeit".toCharArray();

        final File file = new File(source);

        System.out.println("Loading KeyStore " + file + "...");
		final KeyStore ks;
		try (final InputStream in = new FileInputStream(file)) {
			ks = KeyStore.getInstance(KeyStore.getDefaultType());
			ks.load(in, passphrase);
		}

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

        System.out.println("Opening connection to " + host + ":" + port + "...");
        
        try (final SSLSocket socket = (SSLSocket) factory.createSocket(host, port)) {
			socket.setSoTimeout(10000);
            System.out.println("Starting SSL handshake...");
            socket.startHandshake();
			
			System.out.println();
			System.out.println("No errors, certificate is already trusted");
			return;
        } catch (final Exception e) {
			System.out.println("Errors: " + e.getMessage());
		}

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

        System.out.println();
        System.out.println("Server sent " + chain.length + " certificate(s):");
        System.out.println();
        final MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        final MessageDigest md5 = MessageDigest.getInstance("MD5");
        for (final X509Certificate cert : chain) {
            System.out.println(" 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()));
        }

		int i = 1;
		try (final OutputStream out = new FileOutputStream(output)) {
			for (final X509Certificate cert : chain) {
				final String alias = host + "-" + i++;
				ks.setCertificateEntry(alias, cert);
				ks.store(out, outputpassphase);
		
				System.out.println();
				System.out.println(cert);
				System.out.println();
				System.out.println("Added certificate to keystore 'cacerts.jks' using alias '"  + alias + "'");
			}
		}
    }

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

    private static String toHexString(final byte[] bytes) {
        final 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(final X509TrustManager tm) {
            this.tm = tm;
        }

		@Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }

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

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

}