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


    try {
      objToSave = (new java.io.FilePermission("<<ALL FILES>>", "read"))
          .newPermissionCollection();
      ((java.security.PermissionCollection) objToSave)
          .add(new FilePermission("<<ALL FILES>>", "read"));
      ((java.security.PermissionCollection) objToSave)
          .add(new FilePermission("d:\\", "read"));
      if (DEBUG)
        System.out.println("Obj = " + objToSave);
      objLoaded = dumpAndReload(objToSave);


      // Has to have worked

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   */
  public void test_ConstructorLjava_lang_StringLjava_lang_String() {
    // Test for method java.io.FilePermission(java.lang.String,
    // java.lang.String)
    assertTrue("Used to test", true);
    FilePermission constructFile = new FilePermission("test constructor",
        "write");
    assertEquals("action given to the constructor did not correspond - constructor failed",
        "write", constructFile.getActions());
    assertTrue(
        "name given to the construcotr did not correspond - construcotr failed",
        constructFile.getName() == "test constructor");


        // Regression test for HARMONY-1050
        try {
            new FilePermission(null, "drink");
            fail("Expected IAE");
        } catch (IllegalArgumentException e) {
            // Expected
        }
        
        try {
            new FilePermission(null, "read");
            fail("Expected NPE");
        } catch (NullPointerException e) {
            // Expected
        }
        
        try {
            new FilePermission(null, null);
            fail("Expected IAE");
        } catch (IllegalArgumentException e) {
            // Expected
        }
  }

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    assertTrue("Returned false for subset of files and actions",
        allInCurrent.implies(readInFile));
    assertTrue("Returned false for equal FilePermissions", readAllFiles
        .implies(alsoReadAllFiles));


    FilePermission fp3 = new FilePermission("/bob/*".replace('/',
        File.separatorChar), "read,write");
    FilePermission fp4 = new FilePermission("/bob/".replace('/',
        File.separatorChar), "write");
    assertTrue("returned true for same dir using * and not *", !fp3
        .implies(fp4));
    FilePermission fp5 = new FilePermission("/bob/file".replace('/',
        File.separatorChar), "write");
    assertTrue("returned false for same dir using * and file", fp3
        .implies(fp5));


    FilePermission fp6 = new FilePermission("/bob/".replace('/',
        File.separatorChar), "read,write");
    FilePermission fp7 = new FilePermission("/bob/*".replace('/',
        File.separatorChar), "write");
    assertTrue("returned false for same dir using not * and *", !fp6
        .implies(fp7));
    assertTrue("returned false for same subdir", fp6.implies(fp4));


    FilePermission fp8 = new FilePermission("/".replace('/',
        File.separatorChar), "read,write");
    FilePermission fp9 = new FilePermission("/".replace('/',
        File.separatorChar), "write");
    assertTrue("returned false for same dir", fp8.implies(fp9));


    FilePermission fp10 = new FilePermission("/".replace('/',
        File.separatorChar), "read,write");
    FilePermission fp11 = new FilePermission("/".replace('/',
        File.separatorChar), "write");
    assertTrue("returned false for same dir", fp10.implies(fp11));


    FilePermission fp12 = new FilePermission("/*".replace('/',
        File.separatorChar), "read,write");
    assertTrue("returned false for same dir using * and dir", !fp12
        .implies(fp10));
  }

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   * @tests java.io.FilePermission#newPermissionCollection()
   */
  public void test_newPermissionCollection() {
    // test for method java.io.FilePermission.newPermissionCollection
    char s = File.separatorChar;
    FilePermission perm[] = new FilePermission[4];
    perm[0] = readAllFiles;
    perm[1] = allInCurrent;
    perm[2] = new FilePermission(s + "tmp" + s + "test" + s + "*",
        "read,write");
    perm[3] = new FilePermission(s + "tmp" + s + "test" + s
        + "collection.file", "read");


    PermissionCollection collect = perm[0].newPermissionCollection();
    for (int i = 0; i < perm.length; i++) {
      collect.add(perm[i]);
    }
    assertTrue("returned false for subset of files", collect
        .implies(new FilePermission("*", "write")));
    assertTrue("returned false for subset of name and action", collect
        .implies(new FilePermission(s + "tmp", "read")));
    assertTrue("returned true for non subset of file and action", collect
        .implies(readInFile));


    FilePermission fp1 = new FilePermission("/tmp/-".replace('/',
        File.separatorChar), "read");
    PermissionCollection fpc = fp1.newPermissionCollection();
    fpc.add(fp1);
    fpc.add(new FilePermission("/tmp/scratch/foo/*".replace('/',
        File.separatorChar), "write"));
    FilePermission fp2 = new FilePermission("/tmp/scratch/foo/file"
        .replace('/', File.separatorChar), "read,write");
    assertTrue("collection does not collate", fpc.implies(fp2));
  }

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            (File) servletContext.getAttribute(Globals.WORK_DIR_ATTR);
        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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                }
                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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                }
                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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                permissions = policy.getPermissions(source);


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


                // Spec says apps should have read/write for their temp
                // directory. This is fine, as no security sensitive files, at
                // least any that the app doesn't have full control of anyway,
                // will be written here.
                String workDir = options.getScratchDir().toString();
                if (!workDir.endsWith(File.separator)){
                    permissions.add
                        (new FilePermission(workDir,"read,write"));
                    workDir = workDir + File.separator;
                }
                workDir = workDir + "-";
                permissions.add(new FilePermission(
                        workDir,"read,write,delete"));


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


                if (parentClassLoader instanceof URLClassLoader) {
                    URL [] urls = ((URLClassLoader)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) {
                        permissions.add(
                                new FilePermission(jarUrl,"read"));
                        permissions.add(
                                new FilePermission(jarUrl.substring(4),"read"));
                    }
                    if (jndiUrl != null)
                        permissions.add(
                                new FilePermission(jndiUrl,"read") );
                }
            } catch(Exception e) {
                context.log("Security Init for context failed",e);
            }
        }

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