176 lines
5.9 KiB
Java
176 lines
5.9 KiB
Java
/* Policy.java --- Policy Manager Class
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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/**
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Policy is an abstract class for managing the system security
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policy for the Java application environment. It specifies
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which permissions are available for code from various
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sources. The security policy is represented through a
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subclass of Policy.
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Only one Policy is in effect at any time. ProtectionDomain
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initializes itself with information from this class on the
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set of permssions to grant.
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The location for the actual Policy could be anywhere in any
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form because it depends on the Policy implementation. The
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default system is in a flat ASCII file or it could be in a
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database.
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The current installed Policy can be accessed with getPolicy
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and changed with setPolicy if the code has the correct
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permissions.
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The refresh method causes the Policy class to refresh/reload
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its configuration. The method used to refresh depends on the
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Policy implementation.
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When a protection domain initializes its permissions it uses
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code like:
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<code>
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policy = Policy.getPolicy();
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permissionCollection perms = policy.getPermissions(MyCodeSource)
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</code>
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The protection domain passes the Policy handler a CodeSource
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object which contains the codebase URL and public key. The
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Policy implementation then returns the proper set of
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permissions for the CodeSource.
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The default Policy implementation can be changed by setting
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the "policy.provider" security provider in java.security
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to the correct Policy implementation class.
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@author Mark Benvenuto
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@since JDK 1.2
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*/
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public abstract class Policy
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{
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// FIXME: The class name of the Policy provider should really be sourced
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// from the "java.security" configuration file. For now, just hard-code
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// a stub implementation.
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static private Policy currentPolicy = null;
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static
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{
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String pp = System.getProperty ("policy.provider");
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if (pp != null)
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try
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{
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currentPolicy = (Policy)Class.forName(pp).newInstance();
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}
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catch (Exception _)
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{
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currentPolicy = null;
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}
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if (currentPolicy == null)
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currentPolicy = new gnu.java.security.provider.DefaultPolicy();
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}
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/**
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Constructs a new Policy class.
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*/
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public Policy()
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{
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}
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/**
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Gets the currently installed Policy handler. The value should
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not be cached as it can be changed by setPolicy. This
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function first calls <code>SecurityManager.checkPermission</code>
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with <code>SecurityPermission("getPolicy")</code> to check
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if the caller has Permission to get the current Policy.
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@return the current Policy
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@throws SecurityException if the security manager exists
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the caller does not have permission to
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<code>getPolicy</code>.
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*/
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public static Policy getPolicy()
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new SecurityPermission("getPolicy"));
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return currentPolicy;
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}
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/**
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Sets the currently installed Policy handler. This
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function first calls <code>SecurityManager.checkPermission</code>
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with <code>SecurityPermission("setPolicy")</code> to check
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if the caller has Permission to get the current Policy.
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@param policy the new Policy to use
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@throws SecurityException if the security manager exists
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the caller does not have permission to
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<code>getPolicy</code>.
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*/
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public static void setPolicy(Policy policy)
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new SecurityPermission("setPolicy"));
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currentPolicy = policy;
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}
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/**
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Evalutes the global policy and returns a set of Permissions
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allowed for the specified CodeSource.
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@param codesource The CodeSource to get Permission for
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@return a set of permissions for codesource specified by
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the current policy
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@throws SecurityException if the current thread does not
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have permission to call <code>getPermissions</code>
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*/
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public abstract PermissionCollection getPermissions(CodeSource codesource);
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/**
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Refreshes and/or reloads the current Policy. The actual
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behavior of this method depends on the implementation.
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*/
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public abstract void refresh();
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}
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