Authenticate and login context : File Read Write « Security « Java

1. Java
2. Security
3. File Read Write

Authenticate and login context

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.security.PrivilegedAction;

import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

public class AuthenticateNT {
  public static void main(String[] args) {
    try {
      LoginContext loginContext = new LoginContext("AuthenticateNT");
      loginContext.login();
      System.out.println("Login Successful");
      Subject subject = loginContext.getSubject();
      System.out.println(subject);
      Subject.doAs(subject, new WriteFileAction());
      loginContext.logout();
      System.exit(0);
    } catch (LoginException loginException) {
      loginException.printStackTrace();
      System.exit(-1);
    }
  }
}


class WriteFileAction implements PrivilegedAction {
  public Object run() 
  {
     try {
        File file = new File( "D:/", "privilegedFile.txt" );
        FileWriter fileWriter = new FileWriter( file );
        
        fileWriter.write( "Welcome to JAAS!" );
        fileWriter.close();
     }    
     catch ( IOException ioException ) {
        ioException.printStackTrace();
     }
     
     return null;
     
  } 
}

/*
// java.policy
// Policy file that grants AllPermission to JAAS modules and specific permissions to the D:\Projects\Java codebase.
grant codebase "file:/D:/jdk1.3.1/jre/lib/ext/jaas.jar" {
   permission java.security.AllPermission;
}; 

grant codebase "file:/D:/JavaProjects/src/-" {
   permission javax.security.auth.AuthPermission 
      "createLoginContext";

   permission javax.security.auth.AuthPermission "doAs";

   permission java.io.FilePermission "D:/privilegedFile.txt", 
      "write";

   permission java.io.FilePermission "D:/privilegedFile.txt", 
      "read";
};

*/

/*
// jaas.policy
// Policy file defining the permissions for the named Principal
grant codeBase "file:D:/", 
   Principal com.sun.security.auth.NTUserPrincipal "santry" {

   permission java.io.FilePermission "D:/privilegedFile.txt", 
      "write";

   permission java.io.FilePermission "D:/privilegedFile.txt", 
      "read";
};

*/

/*
// jaas.config 
// Configures JAAS to use NTLoginModule
// for authentication.
AuthenticateNT {
   com.sun.security.auth.module.NTLoginModule required debug=false;
};

*/

           
       

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