author | mullan |
Mon, 18 Jun 2012 10:00:55 -0400 | |
changeset 14208 | fd8e875982e9 |
parent 10336 | 0bb1999251f8 |
child 14213 | 91ba926457c6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, 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.security; |
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import sun.security.util.Debug; |
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/** |
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* <p> The AccessController class is used for access control operations |
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* and decisions. |
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* |
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* <p> More specifically, the AccessController class is used for |
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* three purposes: |
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* |
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* <ul> |
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* <li> to decide whether an access to a critical system |
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* resource is to be allowed or denied, based on the security policy |
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* currently in effect,<p> |
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* <li>to mark code as being "privileged", thus affecting subsequent |
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* access determinations, and<p> |
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* <li>to obtain a "snapshot" of the current calling context so |
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* access-control decisions from a different context can be made with |
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* respect to the saved context. </ul> |
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* |
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* <p> The {@link #checkPermission(Permission) checkPermission} method |
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* determines whether the access request indicated by a specified |
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* permission should be granted or denied. A sample call appears |
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* below. In this example, <code>checkPermission</code> will determine |
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* whether or not to grant "read" access to the file named "testFile" in |
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* the "/temp" directory. |
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* |
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* <pre> |
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* |
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* FilePermission perm = new FilePermission("/temp/testFile", "read"); |
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* AccessController.checkPermission(perm); |
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* |
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* </pre> |
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* |
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* <p> If a requested access is allowed, |
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* <code>checkPermission</code> returns quietly. If denied, an |
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* AccessControlException is |
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* thrown. AccessControlException can also be thrown if the requested |
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* permission is of an incorrect type or contains an invalid value. |
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* Such information is given whenever possible. |
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* |
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* Suppose the current thread traversed m callers, in the order of caller 1 |
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* to caller 2 to caller m. Then caller m invoked the |
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* <code>checkPermission</code> method. |
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* The <code>checkPermission </code>method determines whether access |
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* is granted or denied based on the following algorithm: |
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* |
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* <pre> {@code |
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* for (int i = m; i > 0; i--) { |
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* |
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* if (caller i's domain does not have the permission) |
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* throw AccessControlException |
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* |
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* else if (caller i is marked as privileged) { |
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* if (a context was specified in the call to doPrivileged) |
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* context.checkPermission(permission) |
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* return; |
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* } |
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* }; |
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* |
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* // Next, check the context inherited when the thread was created. |
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* // Whenever a new thread is created, the AccessControlContext at |
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* // that time is stored and associated with the new thread, as the |
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* // "inherited" context. |
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* |
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* inheritedContext.checkPermission(permission); |
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* }</pre> |
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* |
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* <p> A caller can be marked as being "privileged" |
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* (see {@link #doPrivileged(PrivilegedAction) doPrivileged} and below). |
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* When making access control decisions, the <code>checkPermission</code> |
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* method stops checking if it reaches a caller that |
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* was marked as "privileged" via a <code>doPrivileged</code> |
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* call without a context argument (see below for information about a |
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* context argument). If that caller's domain has the |
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* specified permission, no further checking is done and |
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* <code>checkPermission</code> |
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* returns quietly, indicating that the requested access is allowed. |
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* If that domain does not have the specified permission, an exception |
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* is thrown, as usual. |
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* |
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* <p> The normal use of the "privileged" feature is as follows. If you |
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* don't need to return a value from within the "privileged" block, do |
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* the following: |
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* |
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* <pre> {@code |
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* somemethod() { |
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* ...normal code here... |
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* AccessController.doPrivileged(new PrivilegedAction<Void>() { |
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* public Void run() { |
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* // privileged code goes here, for example: |
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* System.loadLibrary("awt"); |
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* return null; // nothing to return |
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* } |
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* }); |
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* ...normal code here... |
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* }}</pre> |
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* |
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* <p> |
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* PrivilegedAction is an interface with a single method, named |
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* <code>run</code>. |
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* The above example shows creation of an implementation |
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* of that interface; a concrete implementation of the |
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* <code>run</code> method is supplied. |
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* When the call to <code>doPrivileged</code> is made, an |
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* instance of the PrivilegedAction implementation is passed |
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* to it. The <code>doPrivileged</code> method calls the |
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* <code>run</code> method from the PrivilegedAction |
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* implementation after enabling privileges, and returns the |
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* <code>run</code> method's return value as the |
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* <code>doPrivileged</code> return value (which is |
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* ignored in this example). |
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* |
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* <p> If you need to return a value, you can do something like the following: |
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* |
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* <pre> {@code |
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* somemethod() { |
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* ...normal code here... |
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* String user = AccessController.doPrivileged( |
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* new PrivilegedAction<String>() { |
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* public String run() { |
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* return System.getProperty("user.name"); |
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* } |
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* }); |
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* ...normal code here... |
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* }}</pre> |
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* |
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* <p>If the action performed in your <code>run</code> method could |
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* throw a "checked" exception (those listed in the <code>throws</code> clause |
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* of a method), then you need to use the |
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* <code>PrivilegedExceptionAction</code> interface instead of the |
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* <code>PrivilegedAction</code> interface: |
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* |
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* <pre> {@code |
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* somemethod() throws FileNotFoundException { |
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* ...normal code here... |
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* try { |
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* FileInputStream fis = AccessController.doPrivileged( |
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* new PrivilegedExceptionAction<FileInputStream>() { |
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* public FileInputStream run() throws FileNotFoundException { |
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* return new FileInputStream("someFile"); |
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* } |
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* }); |
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* } catch (PrivilegedActionException e) { |
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* // e.getException() should be an instance of FileNotFoundException, |
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* // as only "checked" exceptions will be "wrapped" in a |
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* // PrivilegedActionException. |
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* throw (FileNotFoundException) e.getException(); |
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* } |
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* ...normal code here... |
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* }}</pre> |
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* |
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* <p> Be *very* careful in your use of the "privileged" construct, and |
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* always remember to make the privileged code section as small as possible. |
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* |
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* <p> Note that <code>checkPermission</code> always performs security checks |
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* within the context of the currently executing thread. |
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* Sometimes a security check that should be made within a given context |
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* will actually need to be done from within a |
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* <i>different</i> context (for example, from within a worker thread). |
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* The {@link #getContext() getContext} method and |
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* AccessControlContext class are provided |
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* for this situation. The <code>getContext</code> method takes a "snapshot" |
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* of the current calling context, and places |
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* it in an AccessControlContext object, which it returns. A sample call is |
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* the following: |
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* |
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* <pre> |
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* |
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* AccessControlContext acc = AccessController.getContext() |
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* |
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* </pre> |
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* |
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* <p> |
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* AccessControlContext itself has a <code>checkPermission</code> method |
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* that makes access decisions based on the context <i>it</i> encapsulates, |
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* rather than that of the current execution thread. |
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* Code within a different context can thus call that method on the |
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* previously-saved AccessControlContext object. A sample call is the |
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* following: |
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* |
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* <pre> |
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* |
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* acc.checkPermission(permission) |
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* |
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* </pre> |
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* |
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* <p> There are also times where you don't know a priori which permissions |
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* to check the context against. In these cases you can use the |
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* doPrivileged method that takes a context: |
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* |
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* <pre> {@code |
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* somemethod() { |
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* AccessController.doPrivileged(new PrivilegedAction<Object>() { |
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* public Object run() { |
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* // Code goes here. Any permission checks within this |
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* // run method will require that the intersection of the |
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* // callers protection domain and the snapshot's |
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* // context have the desired permission. |
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* } |
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* }, acc); |
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* ...normal code here... |
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* }}</pre> |
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* |
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* @see AccessControlContext |
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* |
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* @author Li Gong |
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* @author Roland Schemers |
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*/ |
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public final class AccessController { |
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/** |
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* Don't allow anyone to instantiate an AccessController |
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*/ |
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private AccessController() { } |
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/** |
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* Performs the specified <code>PrivilegedAction</code> with privileges |
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* enabled. The action is performed with <i>all</i> of the permissions |
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* possessed by the caller's protection domain. |
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* |
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* <p> If the action's <code>run</code> method throws an (unchecked) |
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* exception, it will propagate through this method. |
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* |
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* <p> Note that any DomainCombiner associated with the current |
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* AccessControlContext will be ignored while the action is performed. |
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* |
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* @param action the action to be performed. |
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* |
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* @return the value returned by the action's <code>run</code> method. |
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* |
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* @exception NullPointerException if the action is <code>null</code> |
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* |
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* @see #doPrivileged(PrivilegedAction,AccessControlContext) |
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* @see #doPrivileged(PrivilegedExceptionAction) |
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* @see #doPrivilegedWithCombiner(PrivilegedAction) |
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* @see java.security.DomainCombiner |
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*/ |
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public static native <T> T doPrivileged(PrivilegedAction<T> action); |
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/** |
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* Performs the specified <code>PrivilegedAction</code> with privileges |
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* enabled. The action is performed with <i>all</i> of the permissions |
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* possessed by the caller's protection domain. |
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* |
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* <p> If the action's <code>run</code> method throws an (unchecked) |
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* exception, it will propagate through this method. |
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* |
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* <p> This method preserves the current AccessControlContext's |
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* DomainCombiner (which may be null) while the action is performed. |
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* |
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* @param action the action to be performed. |
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* |
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* @return the value returned by the action's <code>run</code> method. |
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* |
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* @exception NullPointerException if the action is <code>null</code> |
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* |
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* @see #doPrivileged(PrivilegedAction) |
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* @see java.security.DomainCombiner |
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* |
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* @since 1.6 |
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*/ |
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public static <T> T doPrivilegedWithCombiner(PrivilegedAction<T> action) { |
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DomainCombiner dc = null; |
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AccessControlContext acc = getStackAccessControlContext(); |
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if (acc == null || (dc = acc.getAssignedCombiner()) == null) { |
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return AccessController.doPrivileged(action, acc); |
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} |
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return AccessController.doPrivileged(action, preserveCombiner(dc)); |
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} |
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/** |
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* Performs the specified <code>PrivilegedAction</code> with privileges |
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* enabled and restricted by the specified |
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* <code>AccessControlContext</code>. |
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* The action is performed with the intersection of the permissions |
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* possessed by the caller's protection domain, and those possessed |
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* by the domains represented by the specified |
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* <code>AccessControlContext</code>. |
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* <p> |
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* If the action's <code>run</code> method throws an (unchecked) exception, |
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* it will propagate through this method. |
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* |
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* @param action the action to be performed. |
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* @param context an <i>access control context</i> |
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* representing the restriction to be applied to the |
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* caller's domain's privileges before performing |
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* the specified action. If the context is |
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* <code>null</code>, |
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* then no additional restriction is applied. |
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* |
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* @return the value returned by the action's <code>run</code> method. |
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* |
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* @exception NullPointerException if the action is <code>null</code> |
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* |
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* @see #doPrivileged(PrivilegedAction) |
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* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext) |
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*/ |
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public static native <T> T doPrivileged(PrivilegedAction<T> action, |
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AccessControlContext context); |
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/** |
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* Performs the specified <code>PrivilegedExceptionAction</code> with |
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* privileges enabled. The action is performed with <i>all</i> of the |
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* permissions possessed by the caller's protection domain. |
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* |
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* <p> If the action's <code>run</code> method throws an <i>unchecked</i> |
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* exception, it will propagate through this method. |
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* |
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* <p> Note that any DomainCombiner associated with the current |
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* AccessControlContext will be ignored while the action is performed. |
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* |
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* @param action the action to be performed |
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* |
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* @return the value returned by the action's <code>run</code> method |
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* |
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* @exception PrivilegedActionException if the specified action's |
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* <code>run</code> method threw a <i>checked</i> exception |
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* @exception NullPointerException if the action is <code>null</code> |
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* |
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* @see #doPrivileged(PrivilegedAction) |
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* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext) |
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* @see #doPrivilegedWithCombiner(PrivilegedExceptionAction) |
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* @see java.security.DomainCombiner |
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*/ |
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public static native <T> T |
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doPrivileged(PrivilegedExceptionAction<T> action) |
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throws PrivilegedActionException; |
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||
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||
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/** |
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* Performs the specified <code>PrivilegedExceptionAction</code> with |
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* privileges enabled. The action is performed with <i>all</i> of the |
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* permissions possessed by the caller's protection domain. |
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* |
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* <p> If the action's <code>run</code> method throws an <i>unchecked</i> |
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* exception, it will propagate through this method. |
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* |
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* <p> This method preserves the current AccessControlContext's |
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* DomainCombiner (which may be null) while the action is performed. |
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* |
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* @param action the action to be performed. |
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* |
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* @return the value returned by the action's <code>run</code> method |
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* |
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* @exception PrivilegedActionException if the specified action's |
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* <code>run</code> method threw a <i>checked</i> exception |
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* @exception NullPointerException if the action is <code>null</code> |
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* |
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* @see #doPrivileged(PrivilegedAction) |
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* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext) |
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* @see java.security.DomainCombiner |
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* |
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* @since 1.6 |
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*/ |
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public static <T> T doPrivilegedWithCombiner |
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(PrivilegedExceptionAction<T> action) throws PrivilegedActionException { |
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DomainCombiner dc = null; |
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AccessControlContext acc = getStackAccessControlContext(); |
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if (acc == null || (dc = acc.getAssignedCombiner()) == null) { |
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return AccessController.doPrivileged(action, acc); |
2 | 393 |
} |
394 |
return AccessController.doPrivileged(action, preserveCombiner(dc)); |
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} |
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397 |
/** |
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* preserve the combiner across the doPrivileged call |
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*/ |
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private static AccessControlContext preserveCombiner |
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(DomainCombiner combiner) { |
|
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||
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/** |
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* callerClass[0] = Reflection.getCallerClass |
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* callerClass[1] = AccessController.preserveCombiner |
|
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* callerClass[2] = AccessController.doPrivileged |
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* callerClass[3] = caller |
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*/ |
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10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
409 |
final Class<?> callerClass = sun.reflect.Reflection.getCallerClass(3); |
2 | 410 |
ProtectionDomain callerPd = doPrivileged |
411 |
(new PrivilegedAction<ProtectionDomain>() { |
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public ProtectionDomain run() { |
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return callerClass.getProtectionDomain(); |
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} |
|
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}); |
|
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||
417 |
// perform 'combine' on the caller of doPrivileged, |
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// even if the caller is from the bootclasspath |
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ProtectionDomain[] pds = new ProtectionDomain[] {callerPd}; |
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return new AccessControlContext(combiner.combine(pds, null), combiner); |
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} |
|
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||
423 |
||
424 |
/** |
|
425 |
* Performs the specified <code>PrivilegedExceptionAction</code> with |
|
426 |
* privileges enabled and restricted by the specified |
|
427 |
* <code>AccessControlContext</code>. The action is performed with the |
|
2589 | 428 |
* intersection of the permissions possessed by the caller's |
2 | 429 |
* protection domain, and those possessed by the domains represented by the |
430 |
* specified <code>AccessControlContext</code>. |
|
431 |
* <p> |
|
432 |
* If the action's <code>run</code> method throws an <i>unchecked</i> |
|
433 |
* exception, it will propagate through this method. |
|
434 |
* |
|
435 |
* @param action the action to be performed |
|
436 |
* @param context an <i>access control context</i> |
|
437 |
* representing the restriction to be applied to the |
|
438 |
* caller's domain's privileges before performing |
|
439 |
* the specified action. If the context is |
|
440 |
* <code>null</code>, |
|
441 |
* then no additional restriction is applied. |
|
442 |
* |
|
443 |
* @return the value returned by the action's <code>run</code> method |
|
444 |
* |
|
445 |
* @exception PrivilegedActionException if the specified action's |
|
446 |
* <code>run</code> method |
|
447 |
* threw a <i>checked</i> exception |
|
448 |
* @exception NullPointerException if the action is <code>null</code> |
|
449 |
* |
|
450 |
* @see #doPrivileged(PrivilegedAction) |
|
451 |
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext) |
|
452 |
*/ |
|
453 |
public static native <T> T |
|
454 |
doPrivileged(PrivilegedExceptionAction<T> action, |
|
455 |
AccessControlContext context) |
|
456 |
throws PrivilegedActionException; |
|
457 |
||
458 |
/** |
|
459 |
* Returns the AccessControl context. i.e., it gets |
|
460 |
* the protection domains of all the callers on the stack, |
|
461 |
* starting at the first class with a non-null |
|
462 |
* ProtectionDomain. |
|
463 |
* |
|
464 |
* @return the access control context based on the current stack or |
|
465 |
* null if there was only privileged system code. |
|
466 |
*/ |
|
467 |
||
468 |
private static native AccessControlContext getStackAccessControlContext(); |
|
469 |
||
470 |
/** |
|
471 |
* Returns the "inherited" AccessControl context. This is the context |
|
472 |
* that existed when the thread was created. Package private so |
|
473 |
* AccessControlContext can use it. |
|
474 |
*/ |
|
475 |
||
476 |
static native AccessControlContext getInheritedAccessControlContext(); |
|
477 |
||
478 |
/** |
|
479 |
* This method takes a "snapshot" of the current calling context, which |
|
480 |
* includes the current Thread's inherited AccessControlContext, |
|
481 |
* and places it in an AccessControlContext object. This context may then |
|
482 |
* be checked at a later point, possibly in another thread. |
|
483 |
* |
|
484 |
* @see AccessControlContext |
|
485 |
* |
|
486 |
* @return the AccessControlContext based on the current context. |
|
487 |
*/ |
|
488 |
||
489 |
public static AccessControlContext getContext() |
|
490 |
{ |
|
491 |
AccessControlContext acc = getStackAccessControlContext(); |
|
492 |
if (acc == null) { |
|
493 |
// all we had was privileged system code. We don't want |
|
494 |
// to return null though, so we construct a real ACC. |
|
495 |
return new AccessControlContext(null, true); |
|
496 |
} else { |
|
497 |
return acc.optimize(); |
|
498 |
} |
|
499 |
} |
|
500 |
||
501 |
/** |
|
502 |
* Determines whether the access request indicated by the |
|
503 |
* specified permission should be allowed or denied, based on |
|
504 |
* the current AccessControlContext and security policy. |
|
505 |
* This method quietly returns if the access request |
|
506 |
* is permitted, or throws an AccessControlException otherwise. The |
|
507 |
* getPermission method of the AccessControlException returns the |
|
508 |
* <code>perm</code> Permission object instance. |
|
509 |
* |
|
510 |
* @param perm the requested permission. |
|
511 |
* |
|
512 |
* @exception AccessControlException if the specified permission |
|
513 |
* is not permitted, based on the current security policy. |
|
514 |
* @exception NullPointerException if the specified permission |
|
515 |
* is <code>null</code> and is checked based on the |
|
516 |
* security policy currently in effect. |
|
517 |
*/ |
|
518 |
||
519 |
public static void checkPermission(Permission perm) |
|
520 |
throws AccessControlException |
|
521 |
{ |
|
522 |
//System.err.println("checkPermission "+perm); |
|
523 |
//Thread.currentThread().dumpStack(); |
|
524 |
||
525 |
if (perm == null) { |
|
526 |
throw new NullPointerException("permission can't be null"); |
|
527 |
} |
|
528 |
||
529 |
AccessControlContext stack = getStackAccessControlContext(); |
|
530 |
// if context is null, we had privileged system code on the stack. |
|
531 |
if (stack == null) { |
|
532 |
Debug debug = AccessControlContext.getDebug(); |
|
533 |
boolean dumpDebug = false; |
|
534 |
if (debug != null) { |
|
535 |
dumpDebug = !Debug.isOn("codebase="); |
|
536 |
dumpDebug &= !Debug.isOn("permission=") || |
|
537 |
Debug.isOn("permission=" + perm.getClass().getCanonicalName()); |
|
538 |
} |
|
539 |
||
540 |
if (dumpDebug && Debug.isOn("stack")) { |
|
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
541 |
Thread.dumpStack(); |
2 | 542 |
} |
543 |
||
544 |
if (dumpDebug && Debug.isOn("domain")) { |
|
545 |
debug.println("domain (context is null)"); |
|
546 |
} |
|
547 |
||
548 |
if (dumpDebug) { |
|
549 |
debug.println("access allowed "+perm); |
|
550 |
} |
|
551 |
return; |
|
552 |
} |
|
553 |
||
554 |
AccessControlContext acc = stack.optimize(); |
|
555 |
acc.checkPermission(perm); |
|
556 |
} |
|
557 |
} |