Skipping Kerberos authentication prompts with JSch

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SFTP connection through Java asking for weird authentication (2 answers)

Closed 2 years ago.

I am using the Connect() method in the Ssh Java class below in order to connect to a server using SSH (JSch) and running a command in the server.

The problem is that when running Connect() the server prompts the next messages:

Kerberos username [********]: 

Kerberos password for ********: 

And in order to continue running I need to manually press the Enter key twice, one for the user name and one for the password. I have tried to add the next code:

// Press ENTER
Robot r = new Robot();
r.keyPress(KeyEvent.VK_ENTER);
r.keyRelease(KeyEvent.VK_ENTER);

But this code only works for the user name, I can not figure out how to automatically press ENTER when the server asks for the password. So far I have tried to put another code snippet as the one shown above below the

session.connect();

line.

package ConnectSSH;

import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.*;

import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UserInfo;

public class Ssh{

    private static final String user = "********";
    private static final String host = "********";
    private static final Integer port = 22;
    private static final String pass = "********";

    public void Connect() throws Exception{
        JSch jsch = new JSch();
        Session session = jsch.getSession(user, host, port);
        UserInfo ui = new SUserInfo(pass, null);
        session.setUserInfo(ui);
        session.setPassword(pass);
        //Press ENTER
        Robot r = new Robot();
        r.keyPress(KeyEvent.VK_ENTER);
        r.keyRelease(KeyEvent.VK_ENTER);
        session.connect();
        ChannelExec channelExec = (ChannelExec)session.openChannel("exec");
        InputStream in = channelExec.getInputStream();
        channelExec.setCommand("RUN COMMAND");
        channelExec.connect();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String linea = null;
        int index = 0;
        while ((linea = reader.readLine()) != null) {
            System.out.println(++index + " : " + linea);
        }
        channelExec.disconnect();
        session.disconnect();
    } 
}

And this is the SUserInfo class

package ConnectSSH;

import com.jcraft.jsch.UserInfo;

public class SUserInfo implements UserInfo {

    private String password;
    private String passPhrase;

    public SUserInfo (String password, String passPhrase) {
        this.password = password;
        this.passPhrase = passPhrase;
    }

    public String getPassphrase() {
        return passPhrase;
    }

    public String getPassword() {
        return password;
    }

    public boolean promptPassphrase(String arg0) {
        return true;
    }

    public boolean promptPassword(String arg0) {
        return false;
    }

    public boolean promptYesNo(String arg0) {
        return true;
    }

    public void showMessage(String arg0) {
        System.out.println("SUserInfo.showMessage()");
    }
}

And this is what the logger returns:

INFO: Connecting to ****** port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-Sun_SSH_1.1.2
INFO: Local version string: SSH-2.0-JSCH-0.1.52
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: CheckKexes: diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: diffie-hellman-group14-sha1 is not available.
INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: aes128-ctr,aes128-cbc,arcfour,3des-cbc,blowfish-cbc,aes192-ctr,aes192-cbc,aes256-ctr,aes256-cbc
INFO: kex: server: aes128-ctr,aes128-cbc,arcfour,3des-cbc,blowfish-cbc,aes192-ctr,aes192-cbc,aes256-ctr,aes256-cbc
INFO: kex: server: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96
INFO: kex: server: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96
INFO: kex: server: none,zlib
INFO: kex: server: none,zlib
INFO: kex: server: ar-EG,ar-SA,bg-BG,ca-ES,cs-CZ,da-DK,de,de-AT,de-CH,de-DE,de-LU,el-CY,el-GR,en-AU,en-CA,en-GB,en-IE,en-MT,en-NZ,en-US,es,es-AR,es-BO,es-CL,es-CO,es-CR,es-EC,es-ES,es-GT,es-MX,es-NI,es-PA,es-PE,es-PY,es-SV,es-UY,es-VE,et-EE,fi-FI,fr,fr-BE,fr-CA,fr-CH,fr-FR,fr-LU,he-IL,hi-IN,hr-HR,hu-HU,is-IS,it,it-IT,ja-JP,kk-KZ,ko,ko-KR,lt-LT,lv-LV,mk-MK,mt-MT,nb-NO,nl-BE,nl-NL,nn-NO,pl,pl-PL,pt-BR,pt-PT,ro-RO,ru,ru-RU,sh-BA,sk-SK,sl-SI,sq-AL,sr-CS,sv,sv-SE,th-TH,tr-TR,uk-UA,zh,zh-CN,zh-HK,zh-TW,ar,ca,cz,da,el,et,fi,he,hu,ja,lt,lv,nl,no,no-NO,no-NY,nr,pt,sr-SP,sr-YU,th,tr,i-default
INFO: kex: server: ar-EG,ar-SA,bg-BG,ca-ES,cs-CZ,da-DK,de,de-AT,de-CH,de-DE,de-LU,el-CY,el-GR,en-AU,en-CA,en-GB,en-IE,en-MT,en-NZ,en-US,es,es-AR,es-BO,es-CL,es-CO,es-CR,es-EC,es-ES,es-GT,es-MX,es-NI,es-PA,es-PE,es-PY,es-SV,es-UY,es-VE,et-EE,fi-FI,fr,fr-BE,fr-CA,fr-CH,fr-FR,fr-LU,he-IL,hi-IN,hr-HR,hu-HU,is-IS,it,it-IT,ja-JP,kk-KZ,ko,ko-KR,lt-LT,lv-LV,mk-MK,mt-MT,nb-NO,nl-BE,nl-NL,nn-NO,pl,pl-PL,pt-BR,pt-PT,ro-RO,ru,ru-RU,sh-BA,sk-SK,sl-SI,sq-AL,sr-CS,sv,sv-SE,th-TH,tr-TR,uk-UA,zh,zh-CN,zh-HK,zh-TW,ar,ca,cz,da,el,et,fi,he,hu,ja,lt,lv,nl,no,no-NO,no-NY,nr,pt,sr-SP,sr-YU,th,tr,i-default
INFO: kex: client: diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: kex: client: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client: 
INFO: kex: client: 
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added '********' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: gssapi-with-mic,publickey,keyboard-interactive,password
INFO: Next authentication method: gssapi-with-mic

And then it shows the next message

Kerberos username [******]: Kerberos password for ********:

Where the Enter key is pressed automatically for the username by the robot, but the Enter key for the password needs to be pressed from the keyboard.

Answer 1

You have a Kerberos/GSSAPI authentication set as the preferred, yet you do not seem to actually use/want it. As you do not specify any username or password for the Kerberos prompts.

The solution is to remove the Kerberos/GSSAPI (gssapi-with-mic) from the list of preferred authentication methods:

session.setConfig(
    "PreferredAuthentications", 
    "publickey,keyboard-interactive,password");

Reference: SFTP connection through Java asking for weird authentication.

Answer 2

Try adding this:

config.put("PreferredAuthentications","publickey,keyboard-interactive,password");
session.setConfig(config);