Skipping Kerberos authentication prompts with JSch [duplicate]

Question

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.

This problem can appear spontaneously, when either Kerberos gets installed on the the client PC or the server starts to support Kerberos.

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

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

Reference: SFTP connection through Java asking for weird authentication.