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

                permissionCollection = policy.getPermissions(codeSource);


                // Create a file read permission for web app context directory
                if (!docBase.endsWith(File.separator)){
                    permissionCollection.add
                        (new FilePermission(docBase,"read"));
                    docBase = docBase + File.separator;
                } else {
                    permissionCollection.add
                        (new FilePermission
                            (docBase.substring(0,docBase.length() - 1),"read"));
                }
                docBase = docBase + "-";
                permissionCollection.add(new FilePermission(docBase,"read"));


                // Create a file read permission for web app tempdir (work)
                // directory
                String workDir = options.getScratchDir().toString();
                if (!workDir.endsWith(File.separator)){
                    permissionCollection.add
                        (new FilePermission(workDir,"read"));
                    workDir = workDir + File.separator;
                }
                workDir = workDir + "-";
                permissionCollection.add(new FilePermission(workDir,"read"));


                // Allow the JSP to access org.apache.jasper.runtime.HttpJspBase
                permissionCollection.add( new RuntimePermission(
                    "accessClassInPackage.org.apache.jasper.runtime") );


                if (parentClassLoader instanceof URLClassLoader) {
                    URL [] urls = parentClassLoader.getURLs();
                    String jarUrl = null;
                    String jndiUrl = null;
                    for (int i=0; i<urls.length; i++) {
                        if (jndiUrl == null
                                && urls[i].toString().startsWith("jndi:") ) {
                            jndiUrl = urls[i].toString() + "-";
                        }
                        if (jarUrl == null
                                && urls[i].toString().startsWith("jar:jndi:")
                                ) {
                            jarUrl = urls[i].toString();
                            jarUrl = jarUrl.substring(0,jarUrl.length() - 2);
                            jarUrl = jarUrl.substring(0,
                                     jarUrl.lastIndexOf('/')) + "/-";
                        }
                    }
                    if (jarUrl != null) {
                        permissionCollection.add(
                                new FilePermission(jarUrl,"read"));
                        permissionCollection.add(
                                new FilePermission(jarUrl.substring(4),"read"));
                    }
                    if (jndiUrl != null)
                        permissionCollection.add(
                                new FilePermission(jndiUrl,"read") );
                }
            } catch(Exception e) {
                context.log("Security Init for context failed",e);
            }
        }

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                    int dirEnd = path.lastIndexOf(File.separator);
                    if (dirEnd != -1){
                        // Include trailing file separator
                        path = path.substring(0, dirEnd + 1);
                        path += "-";
                        dirPerm = new FilePermission(path, "read");
                        perms.add(dirPerm);
                    }
                }
            }
        }

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        if (__userURL.toString().endsWith("/modules/jetty/") ||
            __userURL.toString().endsWith("/modules/jetty"))
        {
            __userURL=new URL(__userURL.toString()+
                              "src/test/java/org/mortbay/resource/");
            FilePermission perm = (FilePermission)
                __userURL.openConnection().getPermission();
            __userDir=new File(perm.getName()).getCanonicalPath()+File.separatorChar;
            __relDir="src/test/java/org/mortbay/resource/"
                .replace('/',File.separatorChar);
        }
        else
        {
            __userURL=new URL(__userURL.toString()+
                              "modules/jetty/src/test/java/org/mortbay/resource/");
            FilePermission perm = (FilePermission)
                __userURL.openConnection().getPermission();
            __userDir=new File(perm.getName()).getCanonicalPath()+File.separatorChar;
            __relDir="modules/jetty/src/test/java/org/mortbay/resource/"
                .replace('/',File.separatorChar);
        }
        
        System.err.println("User Dir="+__userDir);

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      resp.setContentType("text/html");
    
    // Allow user to only read any file in docs directory
    final String aHome = System.getenv("ACCUMULO_HOME");
    PermissionCollection pc = new Permissions();
    pc.add(new FilePermission(aHome + "/docs/-", "read"));
    
    AccessControlContext acc = new AccessControlContext(new ProtectionDomain[] {new ProtectionDomain(null, pc)});
    
    IOException e = AccessController.doPrivileged(new PrivilegedAction<IOException>() {

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         connect();
      SecurityManager sm = System.getSecurityManager();
      if( sm != null )
      {
         // Check for write access
         FilePermission p = new FilePermission(file.getPath(), "write");
         sm.checkPermission(p);
      }
      return new FileOutputStream(file);
   }

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   /** 
    * Return a permission for reading of the file
    */
   public Permission getPermission() throws IOException
   {
      return new FilePermission(file.getPath(), "read");
   }

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         connect();
      SecurityManager sm = System.getSecurityManager();
      if( sm != null )
      {
         // Check for write access
         FilePermission p = new FilePermission(file.getPath(), "write");
         sm.checkPermission(p);
      }
      return new FileOutputStream(file);
   }

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      SecurityManager sm = System.getSecurityManager();
      if (sm != null)
      {
         // Check for write access
         FilePermission p = new FilePermission(file.getPath(), "write");
         sm.checkPermission(p);
      }
      return new FileOutputStream(file);
   }

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   /** 
    * Return a permission for reading of the file
    */
   public Permission getPermission() throws IOException
   {
      return new FilePermission(file.getPath(), "read");
   }

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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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