java.net.NetPermission Class in Java
Last Updated :
13 Jun, 2022
NetPermission class is used to allow network permissions. NetPermission class extends BasicPermission class. It is a “named” permission i.e it contains a name but no action.
| Permission name | What permission allows | Risks associated with this permission |
|---|
| allowHttpTrace | This permission allows using the HTTP TRACE method in HttpURLConnection | Attackers may use HTTP TRACE to access security in the HTTP headers |
| getCookieHandler | This permission allows getting the cookie handler that processes highly secure cookie information for this HTTP session | Attackers may get a cookie handler and get access to highly secure cookie information |
| getNetworkInformation | This permission allows getting information about local network interfaces | Attackers may get information about local hardware |
| getProxySelector | This permission allows the proxy selector to select which proxies to use when making network connections | Attackers may get a ProxySelector and get information about the proxy hosts and ports of internal networks |
| getResponseCache | The permission allows accessing the local response cache | Attackers may get access the local cache which may contain security information |
| requestPasswordAuthentication | This permission grants the ability to ask the authenticator for a password | Attackers may steal this password |
| setCookieHandler | This permission allows setting the cookie handler that processes highly secure cookie information for this HTTP session | Attackers may get a cookie handler and get access to highly secure cookie information |
| setDefaultAuthenticator | This allows to set an authenticator | Attackers may set an authenticator and get security information |
| setProxySelector | This permission allows the proxy selector to set which proxies to use when making network connections | Attackers may set a ProxySelector and get information about the proxy hosts and ports of internal networks |
| setResponseCache | The permission allows setting the local response cache | Attackers may get access the local cache which may contain security information |
| specifyStreamHandler | The permission allows specifying a StreamHandler to create URLs | Attackers may create a URL and get access to resources to which they normally not have access |
Syntax: Class declaration
public final class NetPermission
extends BasicPermission
Constructors of this class
| Constructor | Description |
|---|
| NetPermission(String name) | Used for creating a new NetPermission object with the given name |
| NetPermission(String name, String action) | Used for creating a new NetPermission object with the given name and action |
Methods inherited from class java.security.BasicPermission
| Method | Description |
|---|
| equals(Object obj) | Checks whether the two BasicPermission objects are equal or not |
| getActions() | Returns the actions in String format |
| hashCode() | Returns the hash value for this object |
| implies(Permission permission) | Checks whether the given permission is implied by this object or not |
| newPermissionCollection() | Returns a new PermissionCollection object |
Methods inherited from class java.security.Permission
| Method | Description |
|---|
| checkGuard() | Used to implement guard interface |
| getName() | Returns name of this permission object |
| toString() | Returns string representation of this permission object |
| Methods inherited from class java.lang.Object |
|---|
| clone(), finalize(), getClass(), notify(), notifyAll(), wait(), wait(), wait() |
Example 1:
Java
// Java program to Create a New allow HttpTrace Permission
// Importing required network permission classes
import java.net.NetPermission;
import java.security.Permission;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new allowHttpTrace permission
Permission permission
= new NetPermission("allowHttpTrace");
// Printing the name of the permission using
// getName() method
System.out.println(permission.getName());
// Printing the class of the permission using
// getClass method
System.out.println(permission.getClass());
// Printing the hash value of this permission
// object using hashCode() method
System.out.println(permission.hashCode());
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where the exception occurred
e.printStackTrace();
}
}
}
Output:
allowHttpTrace
class java.net.NetPermission
303901780
Example 2:
Java
// Java Program to Create a New getCookieHandler Permission
// Importing required network permission classes
import java.net.NetPermission;
import java.security.Permission;
// Main Class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new getCookieHandler permission
Permission permission
= new NetPermission("getCookieHandler");
// Printing the name of the permission using
// getName() method
System.out.println(permission.getName());
// Printing the class of the permission using
// getClass method
System.out.println(permission.getClass());
// Printing the hash value of this permission
// object using hashCode() method
System.out.println(permission.hashCode());
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where exception occurred
// using printStackTrace() method
e.printStackTrace();
}
}
}
Output:
getCookieHandler
class java.net.NetPermission
1381623952
Example 3:
Java
// Java Program to Illustrate the Working of equals() Method
// Importing permission classes for networking
import java.net.NetPermission;
import java.security.Permission;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Try block to check for exceptions
try {
// Creating a new getNetworkInformation
// permission
Permission Permission1 = new NetPermission(
"getNetworkInformation");
// Creating a new getProxySelector permission
Permission Permission2
= new NetPermission("getProxySelector");
// Checking if both the given permissions are
// equal or not using equals() method
if (Permission1.equals(Permission2)) {
// Print statement
System.out.println(
"Both permission are equal");
}
// Statements differ
else {
// Print statement
System.out.println(
"Both permission are not equal");
}
}
// Catch block to handle the exceptions
catch (Exception e) {
// Print the line number where the exception occurred
e.printStackTrace();
}
}
}
Output:
Both permission are not equal
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