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  1. package kerberos;
  2.  
  3. import java.io.BufferedReader;
  4. import java.io.IOException;
  5. import java.io.InputStreamReader;
  6. import java.security.PrivilegedActionException;
  7. import java.security.PrivilegedExceptionAction;
  8.  
  9. import javax.security.auth.Subject;
  10. import javax.security.auth.callback.Callback;
  11. import javax.security.auth.callback.CallbackHandler;
  12. import javax.security.auth.callback.PasswordCallback;
  13. import javax.security.auth.callback.TextOutputCallback;
  14. import javax.security.auth.callback.UnsupportedCallbackException;
  15. import javax.security.auth.login.LoginContext;
  16. import javax.security.auth.login.LoginException;
  17.  
  18. import org.ietf.jgss.GSSCredential;
  19. import org.ietf.jgss.GSSException;
  20. import org.ietf.jgss.GSSManager;
  21. import org.ietf.jgss.Oid;
  22.  
  23. public class KerberosLogin {
  24.     public GSSCredential getGSSCredentials(GSSManager mgr, String spn, String keytab, int GSSCredentialType ) throws LoginException, GSSException {
  25. 		LoginContext lc = new LoginContext("Sample", null, null, new LoginConfiguration(spn, keytab, GSSCredentialType));
  26.  
  27. 		lc.login();
  28.  
  29. 		try {
  30. 			return (GSSCredential) Subject.doAs(lc.getSubject(), new SubjectAction(mgr, GSSCredentialType ));
  31. 		} catch (PrivilegedActionException e) {
  32. 			throw (GSSException) e.getCause();
  33. 		}
  34. 	}
  35.  
  36. 	public GSSCredential getGSSCredentials(GSSManager mgr, String spn, int GSSCredentialType  ) throws LoginException, GSSException {
  37. 		LoginContext lc = new LoginContext("Sample", null, new KerberosCallBackHandler(), new LoginConfiguration(spn, GSSCredentialType));
  38.  
  39. 		lc.login();
  40.  
  41. 		try {
  42. 			return (GSSCredential) Subject.doAs(lc.getSubject(), new SubjectAction(mgr, GSSCredentialType));
  43. 		} catch (PrivilegedActionException e) {
  44. 			throw (GSSException) e.getCause();
  45. 		}
  46. 	}
  47.  
  48. 	// Privileged action which runs as the subject to get the credentials and throws the exception thrown by the run() method
  49. 	private static final class SubjectAction implements PrivilegedExceptionAction<GSSCredential> {    
  50. 	    private GSSManager mgr;
  51. 	    private int GSSCredentialType = GSSCredential.INITIATE_AND_ACCEPT;
  52.  
  53. 	    private static final Oid KRB5_MECH = createOid("1.2.840.113554.1.2.2");
  54.  
  55. 	    private static Oid createOid(String rep) {
  56. 			try {
  57. 				return new Oid(rep);
  58. 			} catch (GSSException e) {
  59. 				return null;
  60. 			}
  61. 		}
  62.  
  63. 	    private SubjectAction(GSSManager mgr, int GSSCredentialType) {
  64. 	      this.mgr  = mgr;
  65. 	      this.GSSCredentialType = GSSCredentialType;
  66. 	    }
  67.  
  68. 	    public GSSCredential run() throws GSSException {
  69. 	      return mgr.createCredential(null, GSSCredential.INDEFINITE_LIFETIME, KRB5_MECH, GSSCredentialType );      
  70. 	    }
  71. 	  }
  72. }
  73.  
  74. class KerberosCallBackHandler implements CallbackHandler {
  75. 	public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
  76. 		for (int i = 0; i < callbacks.length; i++) {
  77. 			// display the message
  78. 			if (callbacks[i] instanceof TextOutputCallback) {
  79. 				TextOutputCallback toc = (TextOutputCallback) callbacks[i];
  80.  
  81. 				switch (toc.getMessageType()) {
  82. 				case TextOutputCallback.INFORMATION:
  83. 					System.out.println(toc.getMessage());
  84. 					break;
  85. 				case TextOutputCallback.ERROR:
  86. 					System.out.println("ERROR: " + toc.getMessage());
  87. 					break;
  88. 				case TextOutputCallback.WARNING:
  89. 					System.out.println("WARNING: " + toc.getMessage());
  90. 					break;
  91. 				default:
  92. 					throw new IOException("Unsupported message type: " + toc.getMessageType());
  93. 				}
  94. 			} else if (callbacks[i] instanceof PasswordCallback) {
  95. 				// prompt the user for password
  96. 				PasswordCallback pc = (PasswordCallback) callbacks[i];
  97. 				System.err.print(pc.getPrompt());
  98. 				System.err.flush();
  99. 				pc.setPassword(readPassword());
  100. 			} else {
  101. 				throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");
  102. 			}
  103. 		}
  104. 	}
  105.  
  106. 	private char[] readPassword() throws IOException {
  107. 		BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );
  108. 		return br.readLine().trim().toCharArray();
  109. 	}
  110. }
  111.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:23: error: class KerberosLogin is public, should be declared in a file named KerberosLogin.java
public class KerberosLogin {
       ^
Main.java:25: error: cannot find symbol
		LoginContext lc = new LoginContext("Sample", null, null, new LoginConfiguration(spn, keytab, GSSCredentialType));
		                                                             ^
  symbol:   class LoginConfiguration
  location: class KerberosLogin
Main.java:37: error: cannot find symbol
		LoginContext lc = new LoginContext("Sample", null, new KerberosCallBackHandler(), new LoginConfiguration(spn, GSSCredentialType));
		                                                                                      ^
  symbol:   class LoginConfiguration
  location: class KerberosLogin
3 errors
stdout
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Standard output is empty
https://ideone.com/vaip3H
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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