author | chegar |
Sun, 17 Aug 2014 15:54:13 +0100 | |
changeset 25859 | 3317bb8137f4 |
parent 23010 | jdk/src/share/classes/java/io/FilePermission.java@6dadb192ad81 |
child 26219 | 1a19360ff122 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.io; |
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import java.security.*; |
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import java.util.Enumeration; |
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import java.util.List; |
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import java.util.ArrayList; |
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import java.util.Vector; |
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import java.util.Collections; |
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import sun.security.util.SecurityConstants; |
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/** |
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* This class represents access to a file or directory. A FilePermission consists |
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* of a pathname and a set of actions valid for that pathname. |
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* <P> |
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* Pathname is the pathname of the file or directory granted the specified |
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* actions. A pathname that ends in "/*" (where "/" is |
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* the file separator character, <code>File.separatorChar</code>) indicates |
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* all the files and directories contained in that directory. A pathname |
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* that ends with "/-" indicates (recursively) all files |
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* and subdirectories contained in that directory. A pathname consisting of |
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* the special token "<<ALL FILES>>" matches <b>any</b> file. |
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* <P> |
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* Note: A pathname consisting of a single "*" indicates all the files |
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* in the current directory, while a pathname consisting of a single "-" |
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* indicates all the files in the current directory and |
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* (recursively) all files and subdirectories contained in the current |
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* directory. |
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* <P> |
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* The actions to be granted are passed to the constructor in a string containing |
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* a list of one or more comma-separated keywords. The possible keywords are |
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* "read", "write", "execute", "delete", and "readlink". Their meaning is |
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* defined as follows: |
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* |
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* <DL> |
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* <DT> read <DD> read permission |
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* <DT> write <DD> write permission |
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* <DT> execute |
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* <DD> execute permission. Allows <code>Runtime.exec</code> to |
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* be called. Corresponds to <code>SecurityManager.checkExec</code>. |
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* <DT> delete |
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* <DD> delete permission. Allows <code>File.delete</code> to |
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* be called. Corresponds to <code>SecurityManager.checkDelete</code>. |
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* <DT> readlink |
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* <DD> read link permission. Allows the target of a |
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* <a href="../nio/file/package-summary.html#links">symbolic link</a> |
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* to be read by invoking the {@link java.nio.file.Files#readSymbolicLink |
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* readSymbolicLink } method. |
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* </DL> |
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* <P> |
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* The actions string is converted to lowercase before processing. |
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* <P> |
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* Be careful when granting FilePermissions. Think about the implications |
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* of granting read and especially write access to various files and |
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* directories. The "<<ALL FILES>>" permission with write action is |
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* especially dangerous. This grants permission to write to the entire |
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* file system. One thing this effectively allows is replacement of the |
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* system binary, including the JVM runtime environment. |
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* |
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* <p>Please note: Code can always read a file from the same |
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* directory it's in (or a subdirectory of that directory); it does not |
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* need explicit permission to do so. |
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* |
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* @see java.security.Permission |
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* @see java.security.Permissions |
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* @see java.security.PermissionCollection |
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* |
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* |
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* @author Marianne Mueller |
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* @author Roland Schemers |
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* @since 1.2 |
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* |
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* @serial exclude |
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*/ |
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public final class FilePermission extends Permission implements Serializable { |
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/** |
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* Execute action. |
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*/ |
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private final static int EXECUTE = 0x1; |
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/** |
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* Write action. |
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*/ |
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private final static int WRITE = 0x2; |
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/** |
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* Read action. |
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*/ |
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private final static int READ = 0x4; |
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/** |
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* Delete action. |
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*/ |
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private final static int DELETE = 0x8; |
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/** |
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* Read link action. |
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*/ |
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private final static int READLINK = 0x10; |
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/** |
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* All actions (read,write,execute,delete,readlink) |
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*/ |
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private final static int ALL = READ|WRITE|EXECUTE|DELETE|READLINK; |
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/** |
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* No actions. |
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*/ |
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private final static int NONE = 0x0; |
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// the actions mask |
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private transient int mask; |
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// does path indicate a directory? (wildcard or recursive) |
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private transient boolean directory; |
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// is it a recursive directory specification? |
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private transient boolean recursive; |
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/** |
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* the actions string. |
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* |
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* @serial |
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*/ |
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private String actions; // Left null as long as possible, then |
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// created and re-used in the getAction function. |
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// canonicalized dir path. In the case of |
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// directories, it is the name "/blah/*" or "/blah/-" without |
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// the last character (the "*" or "-"). |
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private transient String cpath; |
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// static Strings used by init(int mask) |
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private static final char RECURSIVE_CHAR = '-'; |
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private static final char WILD_CHAR = '*'; |
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/* |
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public String toString() |
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{ |
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StringBuffer sb = new StringBuffer(); |
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sb.append("***\n"); |
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sb.append("cpath = "+cpath+"\n"); |
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sb.append("mask = "+mask+"\n"); |
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sb.append("actions = "+getActions()+"\n"); |
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sb.append("directory = "+directory+"\n"); |
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sb.append("recursive = "+recursive+"\n"); |
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sb.append("***\n"); |
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return sb.toString(); |
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} |
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*/ |
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private static final long serialVersionUID = 7930732926638008763L; |
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/** |
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* initialize a FilePermission object. Common to all constructors. |
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* Also called during de-serialization. |
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* |
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* @param mask the actions mask to use. |
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* |
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*/ |
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private void init(int mask) { |
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if ((mask & ALL) != mask) |
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throw new IllegalArgumentException("invalid actions mask"); |
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if (mask == NONE) |
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throw new IllegalArgumentException("invalid actions mask"); |
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if ((cpath = getName()) == null) |
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throw new NullPointerException("name can't be null"); |
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this.mask = mask; |
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if (cpath.equals("<<ALL FILES>>")) { |
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directory = true; |
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recursive = true; |
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cpath = ""; |
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return; |
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} |
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// store only the canonical cpath if possible |
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cpath = AccessController.doPrivileged(new PrivilegedAction<String>() { |
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public String run() { |
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try { |
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String path = cpath; |
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if (cpath.endsWith("*")) { |
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// call getCanonicalPath with a path with wildcard character |
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// replaced to avoid calling it with paths that are |
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// intended to match all entries in a directory |
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path = path.substring(0, path.length()-1) + "-"; |
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path = new File(path).getCanonicalPath(); |
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return path.substring(0, path.length()-1) + "*"; |
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} else { |
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return new File(path).getCanonicalPath(); |
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} |
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} catch (IOException ioe) { |
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return cpath; |
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} |
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} |
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}); |
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int len = cpath.length(); |
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char last = ((len > 0) ? cpath.charAt(len - 1) : 0); |
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if (last == RECURSIVE_CHAR && |
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cpath.charAt(len - 2) == File.separatorChar) { |
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directory = true; |
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recursive = true; |
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cpath = cpath.substring(0, --len); |
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} else if (last == WILD_CHAR && |
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cpath.charAt(len - 2) == File.separatorChar) { |
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directory = true; |
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//recursive = false; |
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cpath = cpath.substring(0, --len); |
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} else { |
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// overkill since they are initialized to false, but |
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// commented out here to remind us... |
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//directory = false; |
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//recursive = false; |
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} |
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// XXX: at this point the path should be absolute. die if it isn't? |
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} |
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/** |
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* Creates a new FilePermission object with the specified actions. |
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* <i>path</i> is the pathname of a file or directory, and <i>actions</i> |
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* contains a comma-separated list of the desired actions granted on the |
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* file or directory. Possible actions are |
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* "read", "write", "execute", "delete", and "readlink". |
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* |
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* <p>A pathname that ends in "/*" (where "/" is |
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* the file separator character, <code>File.separatorChar</code>) |
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* indicates all the files and directories contained in that directory. |
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* A pathname that ends with "/-" indicates (recursively) all files and |
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* subdirectories contained in that directory. The special pathname |
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* "<<ALL FILES>>" matches any file. |
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* |
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* <p>A pathname consisting of a single "*" indicates all the files |
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* in the current directory, while a pathname consisting of a single "-" |
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* indicates all the files in the current directory and |
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* (recursively) all files and subdirectories contained in the current |
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* directory. |
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* |
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* <p>A pathname containing an empty string represents an empty path. |
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* |
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* @param path the pathname of the file/directory. |
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* @param actions the action string. |
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* |
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* @throws IllegalArgumentException |
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* If actions is <code>null</code>, empty or contains an action |
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* other than the specified possible actions. |
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*/ |
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14014 | 275 |
public FilePermission(String path, String actions) { |
2 | 276 |
super(path); |
277 |
init(getMask(actions)); |
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} |
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/** |
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* Creates a new FilePermission object using an action mask. |
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* More efficient than the FilePermission(String, String) constructor. |
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* Can be used from within |
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* code that needs to create a FilePermission object to pass into the |
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* <code>implies</code> method. |
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* |
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* @param path the pathname of the file/directory. |
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* @param mask the action mask to use. |
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*/ |
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// package private for use by the FilePermissionCollection add method |
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14014 | 292 |
FilePermission(String path, int mask) { |
2 | 293 |
super(path); |
294 |
init(mask); |
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295 |
} |
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296 |
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297 |
/** |
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298 |
* Checks if this FilePermission object "implies" the specified permission. |
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299 |
* <P> |
|
21334 | 300 |
* More specifically, this method returns true if: |
2 | 301 |
* <ul> |
21334 | 302 |
* <li> <i>p</i> is an instanceof FilePermission, |
2 | 303 |
* <li> <i>p</i>'s actions are a proper subset of this |
21334 | 304 |
* object's actions, and |
2 | 305 |
* <li> <i>p</i>'s pathname is implied by this object's |
306 |
* pathname. For example, "/tmp/*" implies "/tmp/foo", since |
|
307 |
* "/tmp/*" encompasses all files in the "/tmp" directory, |
|
308 |
* including the one named "foo". |
|
309 |
* </ul> |
|
310 |
* |
|
311 |
* @param p the permission to check against. |
|
312 |
* |
|
313 |
* @return <code>true</code> if the specified permission is not |
|
314 |
* <code>null</code> and is implied by this object, |
|
315 |
* <code>false</code> otherwise. |
|
316 |
*/ |
|
317 |
public boolean implies(Permission p) { |
|
318 |
if (!(p instanceof FilePermission)) |
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319 |
return false; |
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320 |
||
321 |
FilePermission that = (FilePermission) p; |
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322 |
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323 |
// we get the effective mask. i.e., the "and" of this and that. |
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324 |
// They must be equal to that.mask for implies to return true. |
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325 |
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326 |
return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that); |
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327 |
} |
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328 |
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329 |
/** |
|
330 |
* Checks if the Permission's actions are a proper subset of the |
|
331 |
* this object's actions. Returns the effective mask iff the |
|
332 |
* this FilePermission's path also implies that FilePermission's path. |
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333 |
* |
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334 |
* @param that the FilePermission to check against. |
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335 |
* @return the effective mask |
|
336 |
*/ |
|
337 |
boolean impliesIgnoreMask(FilePermission that) { |
|
338 |
if (this.directory) { |
|
339 |
if (this.recursive) { |
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340 |
// make sure that.path is longer then path so |
|
341 |
// something like /foo/- does not imply /foo |
|
342 |
if (that.directory) { |
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343 |
return (that.cpath.length() >= this.cpath.length()) && |
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344 |
that.cpath.startsWith(this.cpath); |
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345 |
} else { |
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346 |
return ((that.cpath.length() > this.cpath.length()) && |
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that.cpath.startsWith(this.cpath)); |
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348 |
} |
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349 |
} else { |
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350 |
if (that.directory) { |
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351 |
// if the permission passed in is a directory |
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352 |
// specification, make sure that a non-recursive |
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353 |
// permission (i.e., this object) can't imply a recursive |
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354 |
// permission. |
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355 |
if (that.recursive) |
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356 |
return false; |
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357 |
else |
|
358 |
return (this.cpath.equals(that.cpath)); |
|
359 |
} else { |
|
360 |
int last = that.cpath.lastIndexOf(File.separatorChar); |
|
361 |
if (last == -1) |
|
362 |
return false; |
|
363 |
else { |
|
364 |
// this.cpath.equals(that.cpath.substring(0, last+1)); |
|
365 |
// Use regionMatches to avoid creating new string |
|
366 |
return (this.cpath.length() == (last + 1)) && |
|
367 |
this.cpath.regionMatches(0, that.cpath, 0, last+1); |
|
368 |
} |
|
369 |
} |
|
370 |
} |
|
371 |
} else if (that.directory) { |
|
372 |
// if this is NOT recursive/wildcarded, |
|
373 |
// do not let it imply a recursive/wildcarded permission |
|
374 |
return false; |
|
375 |
} else { |
|
376 |
return (this.cpath.equals(that.cpath)); |
|
377 |
} |
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378 |
} |
|
379 |
||
380 |
/** |
|
381 |
* Checks two FilePermission objects for equality. Checks that <i>obj</i> is |
|
382 |
* a FilePermission, and has the same pathname and actions as this object. |
|
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|
383 |
* |
2 | 384 |
* @param obj the object we are testing for equality with this object. |
385 |
* @return <code>true</code> if obj is a FilePermission, and has the same |
|
386 |
* pathname and actions as this FilePermission object, |
|
387 |
* <code>false</code> otherwise. |
|
388 |
*/ |
|
389 |
public boolean equals(Object obj) { |
|
390 |
if (obj == this) |
|
391 |
return true; |
|
392 |
||
393 |
if (! (obj instanceof FilePermission)) |
|
394 |
return false; |
|
395 |
||
396 |
FilePermission that = (FilePermission) obj; |
|
397 |
||
398 |
return (this.mask == that.mask) && |
|
399 |
this.cpath.equals(that.cpath) && |
|
400 |
(this.directory == that.directory) && |
|
401 |
(this.recursive == that.recursive); |
|
402 |
} |
|
403 |
||
404 |
/** |
|
405 |
* Returns the hash code value for this object. |
|
406 |
* |
|
407 |
* @return a hash code value for this object. |
|
408 |
*/ |
|
409 |
public int hashCode() { |
|
14207 | 410 |
return 0; |
2 | 411 |
} |
412 |
||
413 |
/** |
|
414 |
* Converts an actions String to an actions mask. |
|
415 |
* |
|
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|
416 |
* @param actions the action string. |
2 | 417 |
* @return the actions mask. |
418 |
*/ |
|
419 |
private static int getMask(String actions) { |
|
420 |
int mask = NONE; |
|
421 |
||
422 |
// Null action valid? |
|
423 |
if (actions == null) { |
|
424 |
return mask; |
|
425 |
} |
|
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|
426 |
|
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|
427 |
// Use object identity comparison against known-interned strings for |
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|
428 |
// performance benefit (these values are used heavily within the JDK). |
2 | 429 |
if (actions == SecurityConstants.FILE_READ_ACTION) { |
430 |
return READ; |
|
431 |
} else if (actions == SecurityConstants.FILE_WRITE_ACTION) { |
|
432 |
return WRITE; |
|
433 |
} else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) { |
|
434 |
return EXECUTE; |
|
435 |
} else if (actions == SecurityConstants.FILE_DELETE_ACTION) { |
|
436 |
return DELETE; |
|
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|
437 |
} else if (actions == SecurityConstants.FILE_READLINK_ACTION) { |
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|
438 |
return READLINK; |
2 | 439 |
} |
440 |
||
441 |
char[] a = actions.toCharArray(); |
|
442 |
||
443 |
int i = a.length - 1; |
|
444 |
if (i < 0) |
|
445 |
return mask; |
|
446 |
||
447 |
while (i != -1) { |
|
448 |
char c; |
|
449 |
||
450 |
// skip whitespace |
|
451 |
while ((i!=-1) && ((c = a[i]) == ' ' || |
|
452 |
c == '\r' || |
|
453 |
c == '\n' || |
|
454 |
c == '\f' || |
|
455 |
c == '\t')) |
|
456 |
i--; |
|
457 |
||
458 |
// check for the known strings |
|
459 |
int matchlen; |
|
460 |
||
461 |
if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') && |
|
462 |
(a[i-2] == 'e' || a[i-2] == 'E') && |
|
463 |
(a[i-1] == 'a' || a[i-1] == 'A') && |
|
464 |
(a[i] == 'd' || a[i] == 'D')) |
|
465 |
{ |
|
466 |
matchlen = 4; |
|
467 |
mask |= READ; |
|
468 |
||
469 |
} else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') && |
|
470 |
(a[i-3] == 'r' || a[i-3] == 'R') && |
|
471 |
(a[i-2] == 'i' || a[i-2] == 'I') && |
|
472 |
(a[i-1] == 't' || a[i-1] == 'T') && |
|
473 |
(a[i] == 'e' || a[i] == 'E')) |
|
474 |
{ |
|
475 |
matchlen = 5; |
|
476 |
mask |= WRITE; |
|
477 |
||
478 |
} else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') && |
|
479 |
(a[i-5] == 'x' || a[i-5] == 'X') && |
|
480 |
(a[i-4] == 'e' || a[i-4] == 'E') && |
|
481 |
(a[i-3] == 'c' || a[i-3] == 'C') && |
|
482 |
(a[i-2] == 'u' || a[i-2] == 'U') && |
|
483 |
(a[i-1] == 't' || a[i-1] == 'T') && |
|
484 |
(a[i] == 'e' || a[i] == 'E')) |
|
485 |
{ |
|
486 |
matchlen = 7; |
|
487 |
mask |= EXECUTE; |
|
488 |
||
489 |
} else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') && |
|
490 |
(a[i-4] == 'e' || a[i-4] == 'E') && |
|
491 |
(a[i-3] == 'l' || a[i-3] == 'L') && |
|
492 |
(a[i-2] == 'e' || a[i-2] == 'E') && |
|
493 |
(a[i-1] == 't' || a[i-1] == 'T') && |
|
494 |
(a[i] == 'e' || a[i] == 'E')) |
|
495 |
{ |
|
496 |
matchlen = 6; |
|
497 |
mask |= DELETE; |
|
498 |
||
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|
499 |
} else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') && |
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|
500 |
(a[i-6] == 'e' || a[i-6] == 'E') && |
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|
501 |
(a[i-5] == 'a' || a[i-5] == 'A') && |
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|
502 |
(a[i-4] == 'd' || a[i-4] == 'D') && |
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diff
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|
503 |
(a[i-3] == 'l' || a[i-3] == 'L') && |
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diff
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|
504 |
(a[i-2] == 'i' || a[i-2] == 'I') && |
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changeset
|
505 |
(a[i-1] == 'n' || a[i-1] == 'N') && |
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|
506 |
(a[i] == 'k' || a[i] == 'K')) |
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|
507 |
{ |
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|
508 |
matchlen = 8; |
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|
509 |
mask |= READLINK; |
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changeset
|
510 |
|
2 | 511 |
} else { |
512 |
// parse error |
|
513 |
throw new IllegalArgumentException( |
|
514 |
"invalid permission: " + actions); |
|
515 |
} |
|
516 |
||
517 |
// make sure we didn't just match the tail of a word |
|
518 |
// like "ackbarfaccept". Also, skip to the comma. |
|
519 |
boolean seencomma = false; |
|
520 |
while (i >= matchlen && !seencomma) { |
|
521 |
switch(a[i-matchlen]) { |
|
522 |
case ',': |
|
523 |
seencomma = true; |
|
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diff
changeset
|
524 |
break; |
2 | 525 |
case ' ': case '\r': case '\n': |
526 |
case '\f': case '\t': |
|
527 |
break; |
|
528 |
default: |
|
529 |
throw new IllegalArgumentException( |
|
530 |
"invalid permission: " + actions); |
|
531 |
} |
|
532 |
i--; |
|
533 |
} |
|
534 |
||
535 |
// point i at the location of the comma minus one (or -1). |
|
536 |
i -= matchlen; |
|
537 |
} |
|
538 |
||
539 |
return mask; |
|
540 |
} |
|
541 |
||
542 |
/** |
|
543 |
* Return the current action mask. Used by the FilePermissionCollection. |
|
544 |
* |
|
545 |
* @return the actions mask. |
|
546 |
*/ |
|
547 |
int getMask() { |
|
548 |
return mask; |
|
549 |
} |
|
550 |
||
551 |
/** |
|
552 |
* Return the canonical string representation of the actions. |
|
553 |
* Always returns present actions in the following order: |
|
2057
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diff
changeset
|
554 |
* read, write, execute, delete, readlink. |
2 | 555 |
* |
556 |
* @return the canonical string representation of the actions. |
|
557 |
*/ |
|
14014 | 558 |
private static String getActions(int mask) { |
2 | 559 |
StringBuilder sb = new StringBuilder(); |
560 |
boolean comma = false; |
|
561 |
||
562 |
if ((mask & READ) == READ) { |
|
563 |
comma = true; |
|
564 |
sb.append("read"); |
|
565 |
} |
|
566 |
||
567 |
if ((mask & WRITE) == WRITE) { |
|
568 |
if (comma) sb.append(','); |
|
569 |
else comma = true; |
|
570 |
sb.append("write"); |
|
571 |
} |
|
572 |
||
573 |
if ((mask & EXECUTE) == EXECUTE) { |
|
574 |
if (comma) sb.append(','); |
|
575 |
else comma = true; |
|
576 |
sb.append("execute"); |
|
577 |
} |
|
578 |
||
579 |
if ((mask & DELETE) == DELETE) { |
|
580 |
if (comma) sb.append(','); |
|
581 |
else comma = true; |
|
582 |
sb.append("delete"); |
|
583 |
} |
|
584 |
||
2057
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2
diff
changeset
|
585 |
if ((mask & READLINK) == READLINK) { |
3acf8e5e2ca0
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2
diff
changeset
|
586 |
if (comma) sb.append(','); |
3acf8e5e2ca0
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2
diff
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|
587 |
else comma = true; |
3acf8e5e2ca0
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parents:
2
diff
changeset
|
588 |
sb.append("readlink"); |
3acf8e5e2ca0
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2
diff
changeset
|
589 |
} |
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2
diff
changeset
|
590 |
|
2 | 591 |
return sb.toString(); |
592 |
} |
|
593 |
||
594 |
/** |
|
595 |
* Returns the "canonical string representation" of the actions. |
|
596 |
* That is, this method always returns present actions in the following order: |
|
2057
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2
diff
changeset
|
597 |
* read, write, execute, delete, readlink. For example, if this FilePermission |
3acf8e5e2ca0
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2
diff
changeset
|
598 |
* object allows both write and read actions, a call to <code>getActions</code> |
2 | 599 |
* will return the string "read,write". |
600 |
* |
|
601 |
* @return the canonical string representation of the actions. |
|
602 |
*/ |
|
14014 | 603 |
public String getActions() { |
2 | 604 |
if (actions == null) |
605 |
actions = getActions(this.mask); |
|
606 |
||
607 |
return actions; |
|
608 |
} |
|
609 |
||
610 |
/** |
|
611 |
* Returns a new PermissionCollection object for storing FilePermission |
|
612 |
* objects. |
|
613 |
* <p> |
|
614 |
* FilePermission objects must be stored in a manner that allows them |
|
615 |
* to be inserted into the collection in any order, but that also enables the |
|
616 |
* PermissionCollection <code>implies</code> |
|
617 |
* method to be implemented in an efficient (and consistent) manner. |
|
618 |
* |
|
619 |
* <p>For example, if you have two FilePermissions: |
|
620 |
* <OL> |
|
621 |
* <LI> <code>"/tmp/-", "read"</code> |
|
622 |
* <LI> <code>"/tmp/scratch/foo", "write"</code> |
|
623 |
* </OL> |
|
624 |
* |
|
625 |
* <p>and you are calling the <code>implies</code> method with the FilePermission: |
|
626 |
* |
|
627 |
* <pre> |
|
628 |
* "/tmp/scratch/foo", "read,write", |
|
629 |
* </pre> |
|
630 |
* |
|
631 |
* then the <code>implies</code> function must |
|
632 |
* take into account both the "/tmp/-" and "/tmp/scratch/foo" |
|
633 |
* permissions, so the effective permission is "read,write", |
|
634 |
* and <code>implies</code> returns true. The "implies" semantics for |
|
635 |
* FilePermissions are handled properly by the PermissionCollection object |
|
636 |
* returned by this <code>newPermissionCollection</code> method. |
|
637 |
* |
|
638 |
* @return a new PermissionCollection object suitable for storing |
|
639 |
* FilePermissions. |
|
640 |
*/ |
|
641 |
public PermissionCollection newPermissionCollection() { |
|
642 |
return new FilePermissionCollection(); |
|
643 |
} |
|
644 |
||
645 |
/** |
|
646 |
* WriteObject is called to save the state of the FilePermission |
|
647 |
* to a stream. The actions are serialized, and the superclass |
|
648 |
* takes care of the name. |
|
649 |
*/ |
|
650 |
private void writeObject(ObjectOutputStream s) |
|
651 |
throws IOException |
|
652 |
{ |
|
653 |
// Write out the actions. The superclass takes care of the name |
|
654 |
// call getActions to make sure actions field is initialized |
|
655 |
if (actions == null) |
|
656 |
getActions(); |
|
657 |
s.defaultWriteObject(); |
|
658 |
} |
|
659 |
||
660 |
/** |
|
661 |
* readObject is called to restore the state of the FilePermission from |
|
662 |
* a stream. |
|
663 |
*/ |
|
664 |
private void readObject(ObjectInputStream s) |
|
665 |
throws IOException, ClassNotFoundException |
|
666 |
{ |
|
667 |
// Read in the actions, then restore everything else by calling init. |
|
668 |
s.defaultReadObject(); |
|
669 |
init(getMask(actions)); |
|
670 |
} |
|
671 |
} |
|
672 |
||
673 |
/** |
|
674 |
* A FilePermissionCollection stores a set of FilePermission permissions. |
|
675 |
* FilePermission objects |
|
676 |
* must be stored in a manner that allows them to be inserted in any |
|
677 |
* order, but enable the implies function to evaluate the implies |
|
678 |
* method. |
|
679 |
* For example, if you have two FilePermissions: |
|
680 |
* <OL> |
|
681 |
* <LI> "/tmp/-", "read" |
|
682 |
* <LI> "/tmp/scratch/foo", "write" |
|
683 |
* </OL> |
|
684 |
* And you are calling the implies function with the FilePermission: |
|
685 |
* "/tmp/scratch/foo", "read,write", then the implies function must |
|
686 |
* take into account both the /tmp/- and /tmp/scratch/foo |
|
687 |
* permissions, so the effective permission is "read,write". |
|
688 |
* |
|
689 |
* @see java.security.Permission |
|
690 |
* @see java.security.Permissions |
|
691 |
* @see java.security.PermissionCollection |
|
692 |
* |
|
693 |
* |
|
694 |
* @author Marianne Mueller |
|
695 |
* @author Roland Schemers |
|
696 |
* |
|
697 |
* @serial include |
|
698 |
* |
|
699 |
*/ |
|
700 |
||
701 |
final class FilePermissionCollection extends PermissionCollection |
|
14014 | 702 |
implements Serializable |
703 |
{ |
|
2 | 704 |
// Not serialized; see serialization section at end of class |
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|
705 |
private transient List<Permission> perms; |
2 | 706 |
|
707 |
/** |
|
14014 | 708 |
* Create an empty FilePermissionCollection object. |
2 | 709 |
*/ |
710 |
public FilePermissionCollection() { |
|
7803
56bc97d69d93
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diff
changeset
|
711 |
perms = new ArrayList<>(); |
2 | 712 |
} |
713 |
||
714 |
/** |
|
14014 | 715 |
* Adds a permission to the FilePermissionCollection. The key for the hash is |
2 | 716 |
* permission.path. |
717 |
* |
|
718 |
* @param permission the Permission object to add. |
|
719 |
* |
|
720 |
* @exception IllegalArgumentException - if the permission is not a |
|
721 |
* FilePermission |
|
722 |
* |
|
723 |
* @exception SecurityException - if this FilePermissionCollection object |
|
724 |
* has been marked readonly |
|
725 |
*/ |
|
14014 | 726 |
public void add(Permission permission) { |
2 | 727 |
if (! (permission instanceof FilePermission)) |
728 |
throw new IllegalArgumentException("invalid permission: "+ |
|
729 |
permission); |
|
730 |
if (isReadOnly()) |
|
731 |
throw new SecurityException( |
|
732 |
"attempt to add a Permission to a readonly PermissionCollection"); |
|
733 |
||
734 |
synchronized (this) { |
|
735 |
perms.add(permission); |
|
736 |
} |
|
737 |
} |
|
738 |
||
739 |
/** |
|
740 |
* Check and see if this set of permissions implies the permissions |
|
741 |
* expressed in "permission". |
|
742 |
* |
|
14014 | 743 |
* @param permission the Permission object to compare |
2 | 744 |
* |
745 |
* @return true if "permission" is a proper subset of a permission in |
|
746 |
* the set, false if not. |
|
747 |
*/ |
|
14014 | 748 |
public boolean implies(Permission permission) { |
2 | 749 |
if (! (permission instanceof FilePermission)) |
14014 | 750 |
return false; |
2 | 751 |
|
752 |
FilePermission fp = (FilePermission) permission; |
|
753 |
||
754 |
int desired = fp.getMask(); |
|
755 |
int effective = 0; |
|
756 |
int needed = desired; |
|
757 |
||
758 |
synchronized (this) { |
|
759 |
int len = perms.size(); |
|
760 |
for (int i = 0; i < len; i++) { |
|
761 |
FilePermission x = (FilePermission) perms.get(i); |
|
762 |
if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) { |
|
763 |
effective |= x.getMask(); |
|
764 |
if ((effective & desired) == desired) |
|
765 |
return true; |
|
766 |
needed = (desired ^ effective); |
|
767 |
} |
|
768 |
} |
|
769 |
} |
|
770 |
return false; |
|
771 |
} |
|
772 |
||
773 |
/** |
|
774 |
* Returns an enumeration of all the FilePermission objects in the |
|
775 |
* container. |
|
776 |
* |
|
777 |
* @return an enumeration of all the FilePermission objects. |
|
778 |
*/ |
|
13795
73850c397272
7193406: Clean-up JDK Build Warnings in java.util, java.io
dxu
parents:
9035
diff
changeset
|
779 |
public Enumeration<Permission> elements() { |
2 | 780 |
// Convert Iterator into Enumeration |
781 |
synchronized (this) { |
|
782 |
return Collections.enumeration(perms); |
|
783 |
} |
|
784 |
} |
|
785 |
||
786 |
private static final long serialVersionUID = 2202956749081564585L; |
|
787 |
||
788 |
// Need to maintain serialization interoperability with earlier releases, |
|
789 |
// which had the serializable field: |
|
790 |
// private Vector permissions; |
|
791 |
||
792 |
/** |
|
793 |
* @serialField permissions java.util.Vector |
|
794 |
* A list of FilePermission objects. |
|
795 |
*/ |
|
796 |
private static final ObjectStreamField[] serialPersistentFields = { |
|
797 |
new ObjectStreamField("permissions", Vector.class), |
|
798 |
}; |
|
799 |
||
800 |
/** |
|
801 |
* @serialData "permissions" field (a Vector containing the FilePermissions). |
|
802 |
*/ |
|
803 |
/* |
|
804 |
* Writes the contents of the perms field out as a Vector for |
|
805 |
* serialization compatibility with earlier releases. |
|
806 |
*/ |
|
807 |
private void writeObject(ObjectOutputStream out) throws IOException { |
|
808 |
// Don't call out.defaultWriteObject() |
|
809 |
||
810 |
// Write out Vector |
|
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
811 |
Vector<Permission> permissions = new Vector<>(perms.size()); |
2 | 812 |
synchronized (this) { |
813 |
permissions.addAll(perms); |
|
814 |
} |
|
815 |
||
816 |
ObjectOutputStream.PutField pfields = out.putFields(); |
|
817 |
pfields.put("permissions", permissions); |
|
818 |
out.writeFields(); |
|
819 |
} |
|
820 |
||
821 |
/* |
|
822 |
* Reads in a Vector of FilePermissions and saves them in the perms field. |
|
823 |
*/ |
|
14014 | 824 |
private void readObject(ObjectInputStream in) |
825 |
throws IOException, ClassNotFoundException |
|
826 |
{ |
|
2 | 827 |
// Don't call defaultReadObject() |
828 |
||
829 |
// Read in serialized fields |
|
830 |
ObjectInputStream.GetField gfields = in.readFields(); |
|
831 |
||
832 |
// Get the one we want |
|
13795
73850c397272
7193406: Clean-up JDK Build Warnings in java.util, java.io
dxu
parents:
9035
diff
changeset
|
833 |
@SuppressWarnings("unchecked") |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
834 |
Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null); |
7803
56bc97d69d93
6880112: Project Coin: Port JDK core library code to use diamond operator
smarks
parents:
5506
diff
changeset
|
835 |
perms = new ArrayList<>(permissions.size()); |
2 | 836 |
perms.addAll(permissions); |
837 |
} |
|
838 |
} |