Examples of java.io.FilePermission

java.io.FilePermission
This class represents access to a file or directory. A FilePermission consists of a pathname and a set of actions valid for that pathname.
Pathname is the pathname of the file or directory granted the specified actions. A pathname that ends in "/*" (where "/" is the file separator character, File.separatorChar) indicates all the files and directories contained in that directory. A pathname that ends with "/-" indicates (recursively) all files and subdirectories contained in that directory. A pathname consisting of the special token "<<ALL FILES>>" matches any file.
Note: A pathname consisting of a single "*" indicates all the files in the current directory, while a pathname consisting of a single "-" indicates all the files in the current directory and (recursively) all files and subdirectories contained in the current directory.
The actions to be granted are passed to the constructor in a string containing a list of one or more comma-separated keywords. The possible keywords are "read", "write", "execute", and "delete". Their meaning is defined as follows:

read
read permission
write
write permission
execute
execute permission. Allows Runtime.exec to be called. Corresponds to SecurityManager.checkExec.
delete
delete permission. Allows File.delete to be called. Corresponds to SecurityManager.checkDelete.

The actions string is converted to lowercase before processing.
Be careful when granting FilePermissions. Think about the implications of granting read and especially write access to various files and directories. The "<<ALL FILES>>" permission with write action is especially dangerous. This grants permission to write to the entire file system. One thing this effectively allows is replacement of the system binary, including the JVM runtime environment.
Please note: Code can always read a file from the same directory it's in (or a subdirectory of that directory); it does not need explicit permission to do so. @see java.security.Permission @see java.security.Permissions @see java.security.PermissionCollection @version 1.80 05/11/17 @author Marianne Mueller @author Roland Schemers @since 1.2 @serial exclude

            (File) servletContext.getAttribute(ServletContext.TEMPDIR);
        if (workDir != null) {
            try {
                String workDirPath = workDir.getCanonicalPath();
                classLoader.addPermission
                    (new FilePermission(workDirPath, "read,write"));
                classLoader.addPermission
                    (new FilePermission(workDirPath + File.separator + "-", 
                                        "read,write,delete"));
            } catch (IOException e) {
                // Ignore
            }
        }

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                }
                permission = new JndiPermission(path + "*");
                addPermission(permission);
            } else {
                if (!path.endsWith(File.separator)) {
                    permission = new FilePermission(path, "read");
                    addPermission(permission);
                    path = path + File.separator;
                }
                permission = new FilePermission(path + "-", "read");
                addPermission(permission);
            }
        }
    }

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            (File) servletContext.getAttribute(ServletContext.TEMPDIR);
        if (workDir != null) {
            try {
                String workDirPath = workDir.getCanonicalPath();
                classLoader.addPermission
                    (new FilePermission(workDirPath, "read,write"));
                classLoader.addPermission
                    (new FilePermission(workDirPath + File.separator + "-",
                                        "read,write,delete"));
            } catch (IOException e) {
                // Ignore
            }
        }

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   */
  public Connection(URL url)
  {
    super (url);


    permission = new FilePermission(getURL().getFile(), DEFAULT_PERMISSION);
  }

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    }
    
    public void engineSecured() throws Exception {
        Permissions perms = new Permissions();
        //we need to be able to read files and props so that the default module source provider can work
        perms.add(new FilePermission("<<ALL FILES>>", "read"));
        perms.add(new PropertyPermission("*", "read"));
        
        ScriptEngine eng = new JsEngineInitializer().instantiate(Collections.<String>emptySet(), perms);
        
        try {

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        Permissions perms = new Permissions();
        perms.add(new RuntimePermission("createClassLoader"));
        perms.add(new RuntimePermission("getProtectionDomain"));


        //add permission to read files so that modules can be loaded, but writing should fail
        perms.add(new FilePermission("<<ALL FILES>>", "read"));


        ScriptEngine engine = initializer.instantiate(Collections.<String> emptySet(), perms);


        try {
            engine.eval("import os\nfp = open('pom.xml', 'w')");

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        //allow the scripts to connect via sockets
        add(new SocketPermission("*", "connect,accept"));
        
        //allow access to the server's file system. let the file perms 
        //guard what is writeable and what is not.
        add(new FilePermission("<<ALL FILES>>", "read,write,execute,delete"));
        
        //we don't suppose the serverside scripts to be malevolent, so let's
        //give them the read access to the system properties.
        add(new PropertyPermission("*", "read"));

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            if (File.separatorChar != '/') {
                path = path.replace('/', File.separatorChar);
            }
            if (isDirectory(u)) {
                pc.add(new FilePermission(path + "-", "read"));
            } else {
                pc.add(new FilePermission(path, "read"));
            }
        } else {
            String host = u.getHost();
            if (host.length() == 0) {
                host = "localhost";

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        if (permission == null) {
            String path = fileName;
            if (File.separatorChar != '/') {
                path = path.replace('/', File.separatorChar);
            }
            permission = new FilePermission(path, new String("read"));
        }
        return permission;
    }

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   * 
   * @param file
   *            the name of the file to check
   */
  public void checkDelete(String file) {
    checkPermission(new FilePermission(file, "delete"));
  }

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