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8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson
parent
270fe13182
commit
3789983e89
56923 changed files with 3 additions and 15727 deletions
897
src/java.base/share/classes/java/security/AccessController.java
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897
src/java.base/share/classes/java/security/AccessController.java
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@ -0,0 +1,897 @@
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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
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* version 2 for more details (a copy is included in the LICENSE file that
|
||||
* accompanied this code).
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||||
*
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* You should have received a copy of the GNU General Public License version
|
||||
* 2 along with this work; if not, write to the Free Software Foundation,
|
||||
* 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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import jdk.internal.reflect.CallerSensitive;
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import jdk.internal.reflect.Reflection;
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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,
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* <li>to mark code as being "privileged", thus affecting subsequent
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* access determinations, and
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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} 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} 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} method.
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* The {@code checkPermission} 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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* if (limited permissions were specified in the call to doPrivileged) {
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* for (each limited permission) {
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* if (the limited permission implies the requested permission)
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* return;
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* }
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* } else
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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}
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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}
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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 and at least one limiting permission argument (if any)
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* implies the requested permission, no further checking is done and
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* {@code checkPermission}
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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. If the caller's domain had the specified permission
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* but it was not implied by any limiting permission arguments given in the call
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* to {@code doPrivileged} then the permission checking continues
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* until there are no more callers or another {@code doPrivileged}
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* call matches the requested permission and returns normally.
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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}.
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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} method is supplied.
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* When the call to {@code doPrivileged} is made, an
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* instance of the PrivilegedAction implementation is passed
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* to it. The {@code doPrivileged} method calls the
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* {@code run} method from the PrivilegedAction
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* implementation after enabling privileges, and returns the
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* {@code run} method's return value as the
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* {@code doPrivileged} 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} method could
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* throw a "checked" exception (those listed in the {@code throws} clause
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* of a method), then you need to use the
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* {@code PrivilegedExceptionAction} interface instead of the
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* {@code PrivilegedAction} 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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* You can pass {@code Permission} arguments to further limit the
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* scope of the "privilege" (see below).
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*
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*
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* <p> Note that {@code checkPermission} 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} 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} 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. You can also limit the scope
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* of the privileged code by passing additional {@code Permission}
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* parameters.
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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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* // caller's protection domain and the snapshot's
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* // context have the desired permission. If a requested
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* // permission is not implied by the limiting FilePermission
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* // argument then checking of the thread continues beyond the
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* // caller of doPrivileged.
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* }
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* }, acc, new FilePermission("/temp/*", read));
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* ...normal code here...
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* }}</pre>
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* <p> Passing a limiting {@code Permission} argument of an instance of
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* {@code AllPermission} is equivalent to calling the equivalent
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* {@code doPrivileged} method without limiting {@code Permission}
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* arguments. Passing a zero length array of {@code Permission} disables
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* the code privileges so that checking always continues beyond the caller of
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* that {@code doPrivileged} method.
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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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* @since 1.2
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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} 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} 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 <T> the type of the value returned by the PrivilegedAction's
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* {@code run} method.
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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} method.
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*
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* @exception NullPointerException if the action is {@code null}
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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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@CallerSensitive
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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} 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} 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 <T> the type of the value returned by the PrivilegedAction's
|
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* {@code run} method.
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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} method.
|
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*
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* @exception NullPointerException if the action is {@code null}
|
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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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@CallerSensitive
|
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public static <T> T doPrivilegedWithCombiner(PrivilegedAction<T> action) {
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AccessControlContext acc = getStackAccessControlContext();
|
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if (acc == null) {
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return AccessController.doPrivileged(action);
|
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}
|
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DomainCombiner dc = acc.getAssignedCombiner();
|
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return AccessController.doPrivileged(action,
|
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preserveCombiner(dc, Reflection.getCallerClass()));
|
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}
|
||||
|
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|
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/**
|
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* Performs the specified {@code PrivilegedAction} with privileges
|
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* enabled and restricted by the specified {@code AccessControlContext}.
|
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* The action is performed with the intersection of the permissions
|
||||
* possessed by the caller's protection domain, and those possessed
|
||||
* by the domains represented by the specified {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an (unchecked) exception,
|
||||
* it will propagate through this method.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the PrivilegedAction's
|
||||
* {@code run} method.
|
||||
* @param action the action to be performed.
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null}, then no additional restriction is applied.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method.
|
||||
*
|
||||
* @exception NullPointerException if the action is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext)
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static native <T> T doPrivileged(PrivilegedAction<T> action,
|
||||
AccessControlContext context);
|
||||
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedAction} with privileges
|
||||
* enabled and restricted by the specified
|
||||
* {@code AccessControlContext} and with a privilege scope limited
|
||||
* by specified {@code Permission} arguments.
|
||||
*
|
||||
* The action is performed with the intersection of the permissions
|
||||
* possessed by the caller's protection domain, and those possessed
|
||||
* by the domains represented by the specified
|
||||
* {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an (unchecked) exception,
|
||||
* it will propagate through this method.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the PrivilegedAction's
|
||||
* {@code run} method.
|
||||
* @param action the action to be performed.
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null},
|
||||
* then no additional restriction is applied.
|
||||
* @param perms the {@code Permission} arguments which limit the
|
||||
* scope of the caller's privileges. The number of arguments
|
||||
* is variable.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method.
|
||||
*
|
||||
* @throws NullPointerException if action or perms or any element of
|
||||
* perms is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext)
|
||||
*
|
||||
* @since 1.8
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static <T> T doPrivileged(PrivilegedAction<T> action,
|
||||
AccessControlContext context, Permission... perms) {
|
||||
|
||||
AccessControlContext parent = getContext();
|
||||
if (perms == null) {
|
||||
throw new NullPointerException("null permissions parameter");
|
||||
}
|
||||
Class <?> caller = Reflection.getCallerClass();
|
||||
return AccessController.doPrivileged(action, createWrapper(null,
|
||||
caller, parent, context, perms));
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedAction} with privileges
|
||||
* enabled and restricted by the specified
|
||||
* {@code AccessControlContext} and with a privilege scope limited
|
||||
* by specified {@code Permission} arguments.
|
||||
*
|
||||
* The action is performed with the intersection of the permissions
|
||||
* possessed by the caller's protection domain, and those possessed
|
||||
* by the domains represented by the specified
|
||||
* {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an (unchecked) exception,
|
||||
* it will propagate through this method.
|
||||
*
|
||||
* <p> This method preserves the current AccessControlContext's
|
||||
* DomainCombiner (which may be null) while the action is performed.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the PrivilegedAction's
|
||||
* {@code run} method.
|
||||
* @param action the action to be performed.
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null},
|
||||
* then no additional restriction is applied.
|
||||
* @param perms the {@code Permission} arguments which limit the
|
||||
* scope of the caller's privileges. The number of arguments
|
||||
* is variable.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method.
|
||||
*
|
||||
* @throws NullPointerException if action or perms or any element of
|
||||
* perms is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext)
|
||||
* @see java.security.DomainCombiner
|
||||
*
|
||||
* @since 1.8
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static <T> T doPrivilegedWithCombiner(PrivilegedAction<T> action,
|
||||
AccessControlContext context, Permission... perms) {
|
||||
|
||||
AccessControlContext parent = getContext();
|
||||
DomainCombiner dc = parent.getCombiner();
|
||||
if (dc == null && context != null) {
|
||||
dc = context.getCombiner();
|
||||
}
|
||||
if (perms == null) {
|
||||
throw new NullPointerException("null permissions parameter");
|
||||
}
|
||||
Class <?> caller = Reflection.getCallerClass();
|
||||
return AccessController.doPrivileged(action, createWrapper(dc, caller,
|
||||
parent, context, perms));
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedExceptionAction} with
|
||||
* privileges enabled. The action is performed with <i>all</i> of the
|
||||
* permissions possessed by the caller's protection domain.
|
||||
*
|
||||
* <p> If the action's {@code run} method throws an <i>unchecked</i>
|
||||
* exception, it will propagate through this method.
|
||||
*
|
||||
* <p> Note that any DomainCombiner associated with the current
|
||||
* AccessControlContext will be ignored while the action is performed.
|
||||
*
|
||||
* @param <T> the type of the value returned by the
|
||||
* PrivilegedExceptionAction's {@code run} method.
|
||||
*
|
||||
* @param action the action to be performed
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method
|
||||
*
|
||||
* @exception PrivilegedActionException if the specified action's
|
||||
* {@code run} method threw a <i>checked</i> exception
|
||||
* @exception NullPointerException if the action is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext)
|
||||
* @see #doPrivilegedWithCombiner(PrivilegedExceptionAction)
|
||||
* @see java.security.DomainCombiner
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static native <T> T
|
||||
doPrivileged(PrivilegedExceptionAction<T> action)
|
||||
throws PrivilegedActionException;
|
||||
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedExceptionAction} with
|
||||
* privileges enabled. The action is performed with <i>all</i> of the
|
||||
* permissions possessed by the caller's protection domain.
|
||||
*
|
||||
* <p> If the action's {@code run} method throws an <i>unchecked</i>
|
||||
* exception, it will propagate through this method.
|
||||
*
|
||||
* <p> This method preserves the current AccessControlContext's
|
||||
* DomainCombiner (which may be null) while the action is performed.
|
||||
*
|
||||
* @param <T> the type of the value returned by the
|
||||
* PrivilegedExceptionAction's {@code run} method.
|
||||
*
|
||||
* @param action the action to be performed.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method
|
||||
*
|
||||
* @exception PrivilegedActionException if the specified action's
|
||||
* {@code run} method threw a <i>checked</i> exception
|
||||
* @exception NullPointerException if the action is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedExceptionAction,AccessControlContext)
|
||||
* @see java.security.DomainCombiner
|
||||
*
|
||||
* @since 1.6
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static <T> T doPrivilegedWithCombiner(PrivilegedExceptionAction<T> action)
|
||||
throws PrivilegedActionException
|
||||
{
|
||||
AccessControlContext acc = getStackAccessControlContext();
|
||||
if (acc == null) {
|
||||
return AccessController.doPrivileged(action);
|
||||
}
|
||||
DomainCombiner dc = acc.getAssignedCombiner();
|
||||
return AccessController.doPrivileged(action,
|
||||
preserveCombiner(dc, Reflection.getCallerClass()));
|
||||
}
|
||||
|
||||
/**
|
||||
* preserve the combiner across the doPrivileged call
|
||||
*/
|
||||
private static AccessControlContext preserveCombiner(DomainCombiner combiner,
|
||||
Class<?> caller)
|
||||
{
|
||||
return createWrapper(combiner, caller, null, null, null);
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a wrapper to contain the limited privilege scope data.
|
||||
*/
|
||||
private static AccessControlContext
|
||||
createWrapper(DomainCombiner combiner, Class<?> caller,
|
||||
AccessControlContext parent, AccessControlContext context,
|
||||
Permission[] perms)
|
||||
{
|
||||
ProtectionDomain callerPD = getCallerPD(caller);
|
||||
// check if caller is authorized to create context
|
||||
if (context != null && !context.isAuthorized() &&
|
||||
System.getSecurityManager() != null &&
|
||||
!callerPD.impliesCreateAccessControlContext())
|
||||
{
|
||||
return getInnocuousAcc();
|
||||
} else {
|
||||
return new AccessControlContext(callerPD, combiner, parent,
|
||||
context, perms);
|
||||
}
|
||||
}
|
||||
|
||||
private static class AccHolder {
|
||||
// An AccessControlContext with no granted permissions.
|
||||
// Only initialized on demand when getInnocuousAcc() is called.
|
||||
static final AccessControlContext innocuousAcc =
|
||||
new AccessControlContext(new ProtectionDomain[] {
|
||||
new ProtectionDomain(null, null) });
|
||||
}
|
||||
private static AccessControlContext getInnocuousAcc() {
|
||||
return AccHolder.innocuousAcc;
|
||||
}
|
||||
|
||||
private static ProtectionDomain getCallerPD(final Class <?> caller) {
|
||||
ProtectionDomain callerPd = doPrivileged
|
||||
(new PrivilegedAction<>() {
|
||||
public ProtectionDomain run() {
|
||||
return caller.getProtectionDomain();
|
||||
}
|
||||
});
|
||||
|
||||
return callerPd;
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedExceptionAction} with
|
||||
* privileges enabled and restricted by the specified
|
||||
* {@code AccessControlContext}. The action is performed with the
|
||||
* intersection of the permissions possessed by the caller's
|
||||
* protection domain, and those possessed by the domains represented by the
|
||||
* specified {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an <i>unchecked</i>
|
||||
* exception, it will propagate through this method.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the
|
||||
* PrivilegedExceptionAction's {@code run} method.
|
||||
* @param action the action to be performed
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null}, then no additional restriction is applied.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method
|
||||
*
|
||||
* @exception PrivilegedActionException if the specified action's
|
||||
* {@code run} method threw a <i>checked</i> exception
|
||||
* @exception NullPointerException if the action is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedAction,AccessControlContext)
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static native <T> T
|
||||
doPrivileged(PrivilegedExceptionAction<T> action,
|
||||
AccessControlContext context)
|
||||
throws PrivilegedActionException;
|
||||
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedExceptionAction} with
|
||||
* privileges enabled and restricted by the specified
|
||||
* {@code AccessControlContext} and with a privilege scope limited by
|
||||
* specified {@code Permission} arguments.
|
||||
*
|
||||
* The action is performed with the intersection of the permissions
|
||||
* possessed by the caller's protection domain, and those possessed
|
||||
* by the domains represented by the specified
|
||||
* {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an (unchecked) exception,
|
||||
* it will propagate through this method.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the
|
||||
* PrivilegedExceptionAction's {@code run} method.
|
||||
* @param action the action to be performed.
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null},
|
||||
* then no additional restriction is applied.
|
||||
* @param perms the {@code Permission} arguments which limit the
|
||||
* scope of the caller's privileges. The number of arguments
|
||||
* is variable.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method.
|
||||
*
|
||||
* @throws PrivilegedActionException if the specified action's
|
||||
* {@code run} method threw a <i>checked</i> exception
|
||||
* @throws NullPointerException if action or perms or any element of
|
||||
* perms is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedAction,AccessControlContext)
|
||||
*
|
||||
* @since 1.8
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static <T> T doPrivileged(PrivilegedExceptionAction<T> action,
|
||||
AccessControlContext context, Permission... perms)
|
||||
throws PrivilegedActionException
|
||||
{
|
||||
AccessControlContext parent = getContext();
|
||||
if (perms == null) {
|
||||
throw new NullPointerException("null permissions parameter");
|
||||
}
|
||||
Class <?> caller = Reflection.getCallerClass();
|
||||
return AccessController.doPrivileged(action, createWrapper(null, caller, parent, context, perms));
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Performs the specified {@code PrivilegedExceptionAction} with
|
||||
* privileges enabled and restricted by the specified
|
||||
* {@code AccessControlContext} and with a privilege scope limited by
|
||||
* specified {@code Permission} arguments.
|
||||
*
|
||||
* The action is performed with the intersection of the permissions
|
||||
* possessed by the caller's protection domain, and those possessed
|
||||
* by the domains represented by the specified
|
||||
* {@code AccessControlContext}.
|
||||
* <p>
|
||||
* If the action's {@code run} method throws an (unchecked) exception,
|
||||
* it will propagate through this method.
|
||||
*
|
||||
* <p> This method preserves the current AccessControlContext's
|
||||
* DomainCombiner (which may be null) while the action is performed.
|
||||
* <p>
|
||||
* If a security manager is installed and the specified
|
||||
* {@code AccessControlContext} was not created by system code and the
|
||||
* caller's {@code ProtectionDomain} has not been granted the
|
||||
* {@literal "createAccessControlContext"}
|
||||
* {@link java.security.SecurityPermission}, then the action is performed
|
||||
* with no permissions.
|
||||
*
|
||||
* @param <T> the type of the value returned by the
|
||||
* PrivilegedExceptionAction's {@code run} method.
|
||||
* @param action the action to be performed.
|
||||
* @param context an <i>access control context</i>
|
||||
* representing the restriction to be applied to the
|
||||
* caller's domain's privileges before performing
|
||||
* the specified action. If the context is
|
||||
* {@code null},
|
||||
* then no additional restriction is applied.
|
||||
* @param perms the {@code Permission} arguments which limit the
|
||||
* scope of the caller's privileges. The number of arguments
|
||||
* is variable.
|
||||
*
|
||||
* @return the value returned by the action's {@code run} method.
|
||||
*
|
||||
* @throws PrivilegedActionException if the specified action's
|
||||
* {@code run} method threw a <i>checked</i> exception
|
||||
* @throws NullPointerException if action or perms or any element of
|
||||
* perms is {@code null}
|
||||
*
|
||||
* @see #doPrivileged(PrivilegedAction)
|
||||
* @see #doPrivileged(PrivilegedAction,AccessControlContext)
|
||||
* @see java.security.DomainCombiner
|
||||
*
|
||||
* @since 1.8
|
||||
*/
|
||||
@CallerSensitive
|
||||
public static <T> T doPrivilegedWithCombiner(PrivilegedExceptionAction<T> action,
|
||||
AccessControlContext context,
|
||||
Permission... perms)
|
||||
throws PrivilegedActionException
|
||||
{
|
||||
AccessControlContext parent = getContext();
|
||||
DomainCombiner dc = parent.getCombiner();
|
||||
if (dc == null && context != null) {
|
||||
dc = context.getCombiner();
|
||||
}
|
||||
if (perms == null) {
|
||||
throw new NullPointerException("null permissions parameter");
|
||||
}
|
||||
Class <?> caller = Reflection.getCallerClass();
|
||||
return AccessController.doPrivileged(action, createWrapper(dc, caller,
|
||||
parent, context, perms));
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the AccessControl context. i.e., it gets
|
||||
* the protection domains of all the callers on the stack,
|
||||
* starting at the first class with a non-null
|
||||
* ProtectionDomain.
|
||||
*
|
||||
* @return the access control context based on the current stack or
|
||||
* null if there was only privileged system code.
|
||||
*/
|
||||
|
||||
private static native AccessControlContext getStackAccessControlContext();
|
||||
|
||||
|
||||
/**
|
||||
* Returns the "inherited" AccessControl context. This is the context
|
||||
* that existed when the thread was created. Package private so
|
||||
* AccessControlContext can use it.
|
||||
*/
|
||||
|
||||
static native AccessControlContext getInheritedAccessControlContext();
|
||||
|
||||
/**
|
||||
* This method takes a "snapshot" of the current calling context, which
|
||||
* includes the current Thread's inherited AccessControlContext and any
|
||||
* limited privilege scope, and places it in an AccessControlContext object.
|
||||
* This context may then be checked at a later point, possibly in another thread.
|
||||
*
|
||||
* @see AccessControlContext
|
||||
*
|
||||
* @return the AccessControlContext based on the current context.
|
||||
*/
|
||||
|
||||
public static AccessControlContext getContext()
|
||||
{
|
||||
AccessControlContext acc = getStackAccessControlContext();
|
||||
if (acc == null) {
|
||||
// all we had was privileged system code. We don't want
|
||||
// to return null though, so we construct a real ACC.
|
||||
return new AccessControlContext(null, true);
|
||||
} else {
|
||||
return acc.optimize();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Determines whether the access request indicated by the
|
||||
* specified permission should be allowed or denied, based on
|
||||
* the current AccessControlContext and security policy.
|
||||
* This method quietly returns if the access request
|
||||
* is permitted, or throws an AccessControlException otherwise. The
|
||||
* getPermission method of the AccessControlException returns the
|
||||
* {@code perm} Permission object instance.
|
||||
*
|
||||
* @param perm the requested permission.
|
||||
*
|
||||
* @exception AccessControlException if the specified permission
|
||||
* is not permitted, based on the current security policy.
|
||||
* @exception NullPointerException if the specified permission
|
||||
* is {@code null} and is checked based on the
|
||||
* security policy currently in effect.
|
||||
*/
|
||||
|
||||
public static void checkPermission(Permission perm)
|
||||
throws AccessControlException
|
||||
{
|
||||
//System.err.println("checkPermission "+perm);
|
||||
//Thread.currentThread().dumpStack();
|
||||
|
||||
if (perm == null) {
|
||||
throw new NullPointerException("permission can't be null");
|
||||
}
|
||||
|
||||
AccessControlContext stack = getStackAccessControlContext();
|
||||
// if context is null, we had privileged system code on the stack.
|
||||
if (stack == null) {
|
||||
Debug debug = AccessControlContext.getDebug();
|
||||
boolean dumpDebug = false;
|
||||
if (debug != null) {
|
||||
dumpDebug = !Debug.isOn("codebase=");
|
||||
dumpDebug &= !Debug.isOn("permission=") ||
|
||||
Debug.isOn("permission=" + perm.getClass().getCanonicalName());
|
||||
}
|
||||
|
||||
if (dumpDebug && Debug.isOn("stack")) {
|
||||
Thread.dumpStack();
|
||||
}
|
||||
|
||||
if (dumpDebug && Debug.isOn("domain")) {
|
||||
debug.println("domain (context is null)");
|
||||
}
|
||||
|
||||
if (dumpDebug) {
|
||||
debug.println("access allowed "+perm);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
AccessControlContext acc = stack.optimize();
|
||||
acc.checkPermission(perm);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue