Encrypt tomcat keystore password

Question

Is there an option to encrypt keystorePass value in tomcat server.xml? I don\'t want it to be a plain text

Answer 1

We were also facing similar problem but we created our own encryption and decryption logic to tackle this. Here is the code

/* class is used to generate encrypted password */

public class ClientForPasswordGeneration {

    public static void main(String[] args) {
        //final String secretKey = "ssshhhhhhhhhhh!!!!";
        final String secretKey = PasswordKey.getEncryptionKey();
        GenerateLogic object = new GenerateLogic();

        String password = PasswordField.readPassword("Enter password: ");

        String encryptPassword = object.encrypt(password, secretKey);
        System.out.println("Encrypted Password:");
        System.out.println(encryptPassword);

    }

}

Another Class

class EraserThread implements Runnable {
    private boolean stop;

    /**
     * @param The
     *            prompt displayed to the user
     */
    public EraserThread(String prompt) {
        System.out.print(prompt);
    }

    /**
     * Begin masking...display asterisks (*)
     */
    public void run() {
        stop = true;
        while (stop) {

            System.out.print("\010*");

            try {

                Thread.currentThread().sleep(1);
                // System.out.println("current thread::" + Thread.currentThread());
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }
        }
    }

    /**
     * Instruct the thread to stop masking
     */
    public void stopMasking() {
        this.stop = false;
    }

}

Logic which generated hashed code

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class GenerateLogic {
    private static SecretKeySpec secretKey;
    private static byte[] key;

    public static void setKey(String myKey) {
        MessageDigest sha = null;
        try {
            key = myKey.getBytes("UTF-8");
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16);
            secretKey = new SecretKeySpec(key, "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String strToEncrypt, String secret) {
        try {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
        } catch (Exception e) {
            System.out.println("Error while encrypting: " + e.toString());
        }
        return null;
    }

    public static String decrypt(String strToDecrypt) {
        try {
            //System.out.println("decryptedString methods");
            //String secret = "ssshhhhhhhhhhh!!!!";
            String secret = PasswordKey.getEncryptionKey();
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            //System.out.println("testing string values::" + new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt))));
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } catch (Exception e) {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }

    public static void main(String[] args) {
        final String secretKey = "ssshhhhhhhhhhh!!!!";

        String originalString = "changeit";
        String encryptedString = GenerateLogic.encrypt(originalString, secretKey);
        String decryptedString = GenerateLogic.decrypt(encryptedString);

        System.out.println(originalString);
        System.out.println(encryptedString);
        System.out.println(decryptedString);
    }

}

This is where we extended the class org.apache.coyote.http11.Http11Nio2Protocol which is present in tomcat-coyote-8.0.29.jar which is present in lib folder of tomcat 8. So while compiling these classes tomcat-coyote-8.0.29.jar should be present.

public class Http11Nio2Protocol extends org.apache.coyote.http11.Http11Nio2Protocol {

    @Override
    public void setKeystorePass(String s) {
        try {
            super.setKeystorePass(new GenerateLogic().decrypt(s));
        } catch (final Exception e) {
            super.setKeystorePass("");
        }
    }

}

This is where user has to enter password in cmd which should be hashed

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class PasswordField {

    /**
     * @param prompt
     *            The prompt to display to the user
     * @return The password as entered by the user
     */
    public static String readPassword(String prompt) {
        EraserThread et = new EraserThread(prompt);
        Thread mask = new Thread(et);
        mask.start();

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String password = "";

        try {
            password = in.readLine();

        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        // stop masking
        et.stopMasking();
        // return the password entered by the user
        return password;
    }
}

This is where you keep your password key. You should change it.

public class PasswordKey {

    private static String ENCRYPTION_KEY = "myKeysecretkey";

    protected static String getEncryptionKey()
    {
        return ENCRYPTION_KEY;
    }

}

compile above classes to generate class files with below command in cmd. Remember tomcat-coyote-8.0.29.jar should be present in same folder where all the java files are present.

javac  -cp ".;tomcat-coyote-8.0.29.jar" *.java

Make a jar with the generated class file using this command in cmd

jar -cvf  PasswordEncryptor.jar  *.class

This will create a jar file PasswordEncryptor.jar

Paste the generated PasswordEncryptor.jar in lib folder of Tomcat8. i.e. apache-tomcat-8.5.9\lib

Now go to this location and type below command to generate the hashed password.

java -cp ".;PasswordEncryptor.jar" ClientForPasswordGeneration

Now go to apache-tomcat-8.5.9\conf and edit server.xml

Use the hashed password in keystorpasss of certificate

Notice the protocol is the custom class name.

Hope this will help you.

Thanks