Admin: 1 версия

2010-06-01T06:49:24Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:45Z

Новая страница

== Authenticate and login context ==



<source lang="java">
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;
};
*/

</source>



== Checking permissions ==



<source lang="java">

import java.io.File;
public class Permissions {
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("usage: java Permissions filespec");
return;
}
File file = new File(args[0]);
System.out.println("Checking permissions for " + args[0]);
System.out.println(" Execute = " + file.canExecute());
System.out.println(" Read = " + file.canRead());
System.out.println(" Write = " + file.canWrite());
}
}
</source>



== Writable, read only file ==



<source lang="java">

import java.io.File;
public class ROW {
public static void main(String[] args) {
File filespec = new File("c:\text.txt");
if (filespec.setWritable(false))
System.out.println(filespec + " made read-only");
else
System.out.println("Permission denied");
if (filespec.setWritable(true))
System.out.println(filespec + " made writable");
else
System.out.println("Permission denied");
System.out.println(filespec + " is currently "
+ (filespec.canWrite() ? "writable" : "read-only"));
}
}
</source>

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Java/Security/File Read Write - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010