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jlechner |
/* Policy.java --- Policy Manager Class
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Copyright (C) 1999, 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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import java.util.Collections;
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import java.util.Enumeration;
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import java.util.LinkedHashMap;
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import java.util.Map;
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/**
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* <p>This is an abstract class for representing the system security policy for
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* a Java application environment (specifying which permissions are available
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* for code from various sources). That is, the security policy is represented
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* by a <code>Policy</code> subclass providing an implementation of the abstract
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* methods in this <code>Policy</code> class.</p>
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*
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* <p>There is only one <code>Policy</code> object in effect at any given time.
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* </p>
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*
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* <p>The source location for the policy information utilized by the
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* <code>Policy</code> object is up to the <code>Policy</code> implementation.
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* The policy configuration may be stored, for example, as a flat ASCII file, as
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* a serialized binary file of the <code>Policy</code> class, or as a database.
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* </p>
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*
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* <p>The currently-installed <code>Policy</code> object can be obtained by
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* calling the <code>getPolicy()</code> method, and it can be changed by a call
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* to the <code>setPolicy()</code> method (by code with permission to reset the
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* <code>Policy</code>).</p>
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*
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* <p>The <code>refresh()</code> method causes the policy object to refresh /
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* reload its current configuration.</p>
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*
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* <p>This is implementation-dependent. For example, if the policy object stores
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* its policy in configuration files, calling <code>refresh()</code> will cause
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* it to re-read the configuration policy files. The refreshed policy may not
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* have an effect on classes in a particular {@link ProtectionDomain}. This is
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* dependent on the <code>Policy</code> provider's implementation of the
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* <code>implies()</code> method and the {@link PermissionCollection} caching
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* strategy.</p>
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*
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* <p>The default <code>Policy</code> implementation can be changed by setting
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* the value of the <code>"policy.provider"</code> security property (in the
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* Java security properties file) to the fully qualified name of the desired
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* <code>Policy</code> implementation class. The Java security properties file
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* is located in the file named <code><JAVA_HOME>/lib/security/java.security
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* </code>, where <code><JAVA_HOME></code> refers to the directory where the
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* SDK was installed.</p>
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*
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* <p><b>IMPLEMENTATION NOTE:</b> This implementation attempts to read the
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* System property named <code>policy.provider</code> to find the concrete
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* implementation of the <code>Policy</code>. If/when this fails, it falls back
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* to a default implementation, which <b>allows everything</b>.
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*
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* @author Mark Benvenuto
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* @see CodeSource
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* @see PermissionCollection
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* @see SecureClassLoader
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* @since 1.2
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*/
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public abstract class Policy
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{
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private static Policy currentPolicy;
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/** Map of ProtectionDomains to PermissionCollections for this instance. */
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private Map pd2pc = null;
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/** Constructs a new <code>Policy</code> object. */
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public Policy()
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{
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}
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/**
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* Returns the installed <code>Policy</code> object. This value should not be
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* cached, as it may be changed by a call to <code>setPolicy()</code>. This
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* method first calls {@link SecurityManager#checkPermission(Permission)} with
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* a <code>SecurityPermission("getPolicy")</code> permission to ensure it's ok
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* to get the <code>Policy</code> object.
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*
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* @return the installed <code>Policy</code>.
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* @throws SecurityException if a security manager exists and its
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* <code>checkPermission()</code> method doesn't allow getting the
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* <code>Policy</code> object.
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* @see SecurityManager#checkPermission(Permission)
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* @see #setPolicy(Policy)
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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 getCurrentPolicy();
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}
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/**
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* Sets the system-wide <code>Policy</code> object. This method first calls
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* {@link SecurityManager#checkPermission(Permission)} with a
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* <code>SecurityPermission("setPolicy")</code> permission to ensure it's ok
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* to set the <code>Policy</code>.
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*
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* @param policy the new system <code>Policy</code> object.
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* @throws SecurityException if a security manager exists and its
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* <code>checkPermission()</code> method doesn't allow setting the
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* <code>Policy</code>.
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* @see SecurityManager#checkPermission(Permission)
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* @see #getPolicy()
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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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setup(policy);
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currentPolicy = policy;
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}
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private static void setup(final Policy policy)
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{
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if (policy.pd2pc == null)
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policy.pd2pc = Collections.synchronizedMap(new LinkedHashMap());
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ProtectionDomain pd = policy.getClass().getProtectionDomain();
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if (pd.getCodeSource() != null)
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{
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PermissionCollection pc = null;
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if (currentPolicy != null)
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pc = currentPolicy.getPermissions(pd);
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if (pc == null) // assume it has all
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{
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pc = new Permissions();
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pc.add(new AllPermission());
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}
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policy.pd2pc.put(pd, pc); // add the mapping pd -> pc
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}
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}
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/**
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* Ensures/forces loading of the configured policy provider, while bypassing
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* the {@link SecurityManager} checks for <code>"getPolicy"</code> security
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* permission. Needed by {@link ProtectionDomain}.
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*/
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static Policy getCurrentPolicy()
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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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if (currentPolicy == null)
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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 e)
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{
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// Ignored.
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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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return currentPolicy;
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}
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/**
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* Tests if <code>currentPolicy</code> is not <code>null</code>,
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* thus allowing clients to not force loading of any policy
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* provider; needed by {@link ProtectionDomain}.
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*/
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static boolean isLoaded()
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{
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return currentPolicy != null;
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}
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/**
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* Evaluates the global policy and returns a {@link PermissionCollection}
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* object specifying the set of permissions allowed for code from the
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* specified code source.
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*
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* @param codesource the {@link CodeSource} associated with the caller. This
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* encapsulates the original location of the code (where the code came from)
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* and the public key(s) of its signer.
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* @return the set of permissions allowed for code from codesource according
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* to the policy. The returned set of permissions must be a new mutable
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* instance and it must support heterogeneous {@link Permission} types.
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*/
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public abstract PermissionCollection getPermissions(CodeSource codesource);
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/**
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* Evaluates the global policy and returns a {@link PermissionCollection}
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* object specifying the set of permissions allowed given the characteristics
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* of the protection domain.
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*
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* @param domain the {@link ProtectionDomain} associated with the caller.
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* @return the set of permissions allowed for the domain according to the
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* policy. The returned set of permissions must be a new mutable instance and
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* it must support heterogeneous {@link Permission} types.
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* @since 1.4
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* @see ProtectionDomain
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* @see SecureClassLoader
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*/
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public PermissionCollection getPermissions(ProtectionDomain domain)
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{
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if (domain == null)
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return new Permissions();
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if (pd2pc == null)
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setup(this);
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PermissionCollection result = (PermissionCollection) pd2pc.get(domain);
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if (result != null)
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{
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Permissions realResult = new Permissions();
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for (Enumeration e = result.elements(); e.hasMoreElements(); )
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realResult.add((Permission) e.nextElement());
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return realResult;
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}
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result = getPermissions(domain.getCodeSource());
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if (result == null)
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result = new Permissions();
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PermissionCollection pc = domain.getPermissions();
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if (pc != null)
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for (Enumeration e = pc.elements(); e.hasMoreElements(); )
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result.add((Permission) e.nextElement());
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return result;
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}
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/**
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* Evaluates the global policy for the permissions granted to the {@link
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* ProtectionDomain} and tests whether the <code>permission</code> is granted.
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*
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* @param domain the {@link ProtectionDomain} to test.
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* @param permission the {@link Permission} object to be tested for
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* implication.
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* @return <code>true</code> if <code>permission</code> is a proper subset of
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* a permission granted to this {@link ProtectionDomain}.
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* @since 1.4
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* @see ProtectionDomain
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*/
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public boolean implies(ProtectionDomain domain, Permission permission)
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{
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if (pd2pc == null)
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setup(this);
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PermissionCollection pc = (PermissionCollection) pd2pc.get(domain);
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if (pc != null)
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return pc.implies(permission);
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boolean result = false;
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pc = getPermissions(domain);
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if (pc != null)
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{
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result = pc.implies(permission);
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pd2pc.put(domain, pc);
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}
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return result;
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}
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/**
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* Refreshes/reloads the policy configuration. The behavior of this method
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* depends on the implementation. For example, calling refresh on a file-based
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* policy will cause the file to be re-read.
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*/
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public abstract void refresh();
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}
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