Examples of java.util.PropertyPermission

java.util.PropertyPermission
This class is for property permissions.
The name is the name of the property ("java.home", "os.name", etc). The naming convention follows the hierarchical property naming convention. Also, an asterisk may appear at the end of the name, following a ".", or by itself, to signify a wildcard match. For example: "java.*" or "*" is valid, "*java" or "a*b" is not valid.

The actions to be granted are passed to the constructor in a string containing a list of zero or more comma-separated keywords. The possible keywords are "read" and "write". Their meaning is defined as follows:

read
read permission. Allows System.getProperty to be called.
write
write permission. Allows System.setProperty to be called.

The actions string is converted to lowercase before processing.
Care should be taken before granting code permission to access certain system properties. For example, granting permission to access the "java.home" system property gives potentially malevolent code sensitive information about the system environment (the Java installation directory). Also, granting permission to access the "user.name" and "user.home" system properties gives potentially malevolent code sensitive information about the user environment (the user's account name and home directory). @see java.security.BasicPermission @see java.security.Permission @see java.security.Permissions @see java.security.PermissionCollection @see java.lang.SecurityManager @version 1.35 06/04/21 @author Roland Schemers @since 1.2 @serial exclude

    private void setupDefaultPermissions()
    {
        //these properties straight out ot ${java.home}/lib/security/java.policy
        final Permissions permissions = createPermissionSetFor( getInclusiveURL(), null );


        permissions.add( new PropertyPermission( "os.name", "read" ) );
        permissions.add( new PropertyPermission( "os.arch", "read" ) );
        permissions.add( new PropertyPermission( "os.version", "read" ) );
        permissions.add( new PropertyPermission( "file.separator", "read" ) );
        permissions.add( new PropertyPermission( "path.separator", "read" ) );
        permissions.add( new PropertyPermission( "line.separator", "read" ) );


        permissions.add( new PropertyPermission( "java.version", "read" ) );
        permissions.add( new PropertyPermission( "java.vendor", "read" ) );
        permissions.add( new PropertyPermission( "java.vendor.url", "read" ) );


        permissions.add( new PropertyPermission( "java.class.version", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.version", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.vendor", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.name", "read" ) );


        permissions.add( new PropertyPermission( "java.specification.version", "read" ) );
        permissions.add( new PropertyPermission( "java.specification.vendor", "read" ) );
        permissions.add( new PropertyPermission( "java.specification.name", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.specification.version", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.specification.vendor", "read" ) );
        permissions.add( new PropertyPermission( "java.vm.specification.name", "read" ) );
    }

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     * @throws SecurityException
     *             if the calling thread is not allowed to access the {@code
     *             key} system property.
     */
    public void checkPropertyAccess(String key) {
        checkPermission(new PropertyPermission(key, "read")); //$NON-NLS-1$
    }

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        permissionsDenied.add(new AllPermission());
        permissionsGranted = new Permissions();


        // junit harness stuff
        permissionsGranted
                .add(new PropertyPermission("line.separator", "read"));
        permissionsGranted.add(new RuntimePermission("exitVM"));
        permissionsGranted.add(new LoggingPermission("control", null));


        //grant permission to install security manager :-)
        permissionsGranted.add(new RuntimePermission("setSecurityManager"));

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    Object objToSave = null;
    Object objLoaded;


    try {
      PropertyPermission test = new PropertyPermission("java.*",
          "read,write");
      PermissionCollection p = test.newPermissionCollection();
      p.add(new PropertyPermission("java.*", "read"));
      p.add(new PropertyPermission("java.*", "write"));
      // System.out.println("Does implies work? " + p.implies(test));


      objToSave = p;
      if (DEBUG)
        System.out.println("Obj = " + objToSave);

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   * @tests java.util.PropertyPermission#equals(java.lang.Object)
   */
  public void test_equalsLjava_lang_Object() {
    // Test for method boolean
    // java.util.PropertyPermission.equals(java.lang.Object)
    PropertyPermission equalToJavaPP = new PropertyPermission("java.*",
        "read");
    PropertyPermission notEqualToJavaPP = new PropertyPermission("java.*",
        "read, write");
    PropertyPermission alsoNotEqualToJavaPP = new PropertyPermission(
        "java.home", "read");


    assertTrue("Equal returned false for equal objects", javaPP
        .equals(equalToJavaPP));
    assertTrue("Equal returned true for objects with different names",

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   * @tests java.util.PropertyPermission#implies(java.security.Permission)
   */
  public void test_impliesLjava_security_Permission() {
    // Test for method boolean
    // java.util.PropertyPermission.implies(java.security.Permission)
    PropertyPermission impliedByJavaPP = new PropertyPermission(
        "java.home", "read");
    PropertyPermission notImpliedByJavaPP = new PropertyPermission(
        "java.home", "read,write");
    PropertyPermission impliedByUserPP = new PropertyPermission(
        "user.name", "read,write");
    PropertyPermission alsoImpliedByUserPP = new PropertyPermission(
        "user.name", "write");
    assertTrue("Returned false for implied permission (subset of .*)",
        javaPP.implies(impliedByJavaPP));
    assertTrue("Returned true for unimplied permission", !javaPP
        .implies(notImpliedByJavaPP));

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    /**
     * @tests java.util.PropertyPermission#readObject(ObjectInputStream)
     * @tests java.util.PropertyPermission#writeObject(ObjectOutputStream)
     */
    public void test_serialization() throws Exception{
        PropertyPermission pp = new PropertyPermission("test", "read");
        SerializationTest.verifySelf(pp, comparator);
        SerializationTest.verifyGolden(this, pp, comparator);
    }

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     * 
     * @param key
     *            the name of the property to be accessed.
     */
    public void checkPropertyAccess(String key) {
        checkPermission(new PropertyPermission(key, "read")); //$NON-NLS-1$
    }

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        if (prop.length() == 0) {
            throw new IllegalArgumentException();
        }
        SecurityManager secMgr = System.getSecurityManager();
        if (secMgr != null) {
            secMgr.checkPermission(new PropertyPermission(prop, "write"));
        }
        return (String) systemProperties.setProperty(prop, value);
    }

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            throw new IllegalArgumentException();
        }


        SecurityManager secMgr = System.getSecurityManager();
        if (secMgr != null) {
            secMgr.checkPermission(new PropertyPermission(key, "write"));
        }
        return (String) systemProperties.remove(key);
    }

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