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"Implementing a Security Policy"
Vol. 2, Issue 8, p. 50

	

Listing 1: New Security Manager
  
class ServeSecurityManager extends SecurityManager {  
    // the following operations are allowed:  
    public void checkConnect(String host, int port) { };  
    public void checkCreateClassLoader() { };  
    public void checkAccess(Thread g) { };  
    public void checkListen(int port) { };  
    public void checkLink(String lib) { };  
    public void checkPropertyAccess(String key) { };   
    public void checkAccept(String host, int port) { };  
    public void checkAccess(ThreadGroup g) { };  
    public void checkRead(FileDescriptor fd) { };  
    public void checkWrite(String f) { };  
    public void checkWrite(FileDescriptor fd) { };  
      
    // here goes more methods that we want to override...  
     
    public void checkRead(String filename){  
     if ((filename.indexOf("..") != -1) || (filename.startWith("/"))) {  
       throw new SecurityException("403 Forbidden. No enough rights to read:"+filename+");  
        }  
    }  
}


 

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