How to get saved passwords in Finalshell

After connecting to the linux service through the Finalshell tool, but forgetting the linux login password, you can retrieve it without resetting. The steps are as follows

Step 1, find the finalshell tool installation path

Step 2, the files under this folder are all named after the connected service host name, open the host name file whose password you forgot

Step 3, the green color behind the password in the file is the encrypted password as shown in the figure

 

Step 4, decrypt the code as shown in the figure below, take the encrypted password as an input parameter, execute the main method, and the console can print out the decrypted password

package cn.demo.controller;
import java.io.ByteArrayOutputStream;
        import java.io.DataOutputStream;
        import java.io.IOException;
        import java.math.BigInteger;
        import java.security.MessageDigest;
        import java.security.NoSuchAlgorithmException;
        import java.security.SecureRandom;
        import java.util.Base64;
        import java.util.Random;

        import javax.crypto.Cipher;
        import javax.crypto.SecretKey;
        import javax.crypto.SecretKeyFactory;
        import javax.crypto.spec.DESKeySpec;

public class FinalShellDecodePass {
    public static void main(String[] args)throws Exception {
        //入参改成加密的密码，运行一下，其他地方不需要修改
        System.out.println(decodePass("e0QlMF52FiAGXQl0r1RQao7UE9PbfFm+"));
    }
    public static byte[] desDecode(byte[] data, byte[] head) throws Exception {
        SecureRandom sr = new SecureRandom();
        DESKeySpec dks = new DESKeySpec(head);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(2, securekey, sr);
        return cipher.doFinal(data);
    }
    public static String decodePass(String data) throws Exception {
        if (data == null) {
            return null;
        } else {
            String rs = "";
            byte[] buf = Base64.getDecoder().decode(data);
            byte[] head = new byte[8];
            System.arraycopy(buf, 0, head, 0, head.length);
            byte[] d = new byte[buf.length - head.length];
            System.arraycopy(buf, head.length, d, 0, d.length);
            byte[] bt = desDecode(d, ranDomKey(head));
            rs = new String(bt);

            return rs;
        }
    }
    static byte[] ranDomKey(byte[] head) {
        long ks = 3680984568597093857L / (long)(new Random((long)head[5])).nextInt(127);
        Random random = new Random(ks);
        int t = head[0];

        for(int i = 0; i < t; ++i) {
            random.nextLong();
        }

        long n = random.nextLong();
        Random r2 = new Random(n);
        long[] ld = new long[]{(long)head[4], r2.nextLong(), (long)head[7], (long)head[3], r2.nextLong(), (long)head[1], random.nextLong(), (long)head[2]};
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(bos);
        long[] var15 = ld;
        int var14 = ld.length;

        for(int var13 = 0; var13 < var14; ++var13) {
            long l = var15[var13];

            try {
                dos.writeLong(l);
            } catch (IOException var18) {
                var18.printStackTrace();
            }
        }

        try {
            dos.close();
        } catch (IOException var17) {
            var17.printStackTrace();
        }

        byte[] keyData = bos.toByteArray();
        keyData = md5(keyData);
        return keyData;
    }
    public static byte[] md5(byte[] data) {
        String ret = null;
        byte[] res=null;

        try {
            MessageDigest m;
            m = MessageDigest.getInstance("MD5");
            m.update(data, 0, data.length);
            res=m.digest();
            ret = new BigInteger(1, res).toString(16);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return res;
    }
}

Step 5, as shown in the figure

 

 

Step 6, the connection is successful.