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Diffstat (limited to 'libjava/classpath/java/security/Policy.java')
| -rw-r--r-- | libjava/classpath/java/security/Policy.java | 297 |
1 files changed, 0 insertions, 297 deletions
diff --git a/libjava/classpath/java/security/Policy.java b/libjava/classpath/java/security/Policy.java deleted file mode 100644 index 118626e..0000000 --- a/libjava/classpath/java/security/Policy.java +++ /dev/null @@ -1,297 +0,0 @@ -/* Policy.java --- Policy Manager Class - Copyright (C) 1999, 2003, 2004 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - -package java.security; - -import java.util.Collections; -import java.util.Enumeration; -import java.util.LinkedHashMap; -import java.util.Map; - -/** - * <code>Policy</code> is an abstract class for managing the system security - * policy for the Java application environment. It specifies which permissions - * are available for code from various sources. The security policy is - * represented through a subclass of <code>Policy</code>. - * - * <p>Only one <code>Policy</code> is in effect at any time. A - * {@link ProtectionDomain} initializes itself with information from this class - * on the set of permssions to grant.</p> - * - * <p>The location for the actual <code>Policy</code> could be anywhere in any - * form because it depends on the Policy implementation. The default system is - * in a flat ASCII file or it could be in a database.</p> - * - * <p>The current installed <code>Policy</code> can be accessed with - * {@link #getPolicy()} and changed with {@link #setPolicy(Policy)} if the code - * has the correct permissions.</p> - * - * <p>The {@link #refresh()} method causes the <code>Policy</code> instance to - * refresh/reload its configuration. The method used to refresh depends on the - * <code>Policy</code> implementation.</p> - * - * <p>When a protection domain initializes its permissions, it uses code like - * the following:</p> - * - * <code> - * policy = Policy.getPolicy(); - * PermissionCollection perms = policy.getPermissions(myCodeSource); - * </code> - * - * <p>The protection domain passes the <code>Policy</code> handler a - * {@link CodeSource} instance which contains the codebase URL and a public key. - * The <code>Policy</code> implementation then returns the proper set of - * permissions for that {@link CodeSource}.</p> - * - * <p>The default <code>Policy</code> implementation can be changed by setting - * the "policy.provider" security provider in the "java.security" file to the - * correct <code>Policy</code> implementation class.</p> - * - * @author Mark Benvenuto - * @see CodeSource - * @see PermissionCollection - * @see SecureClassLoader - * @since 1.2 - */ -public abstract class Policy -{ - private static Policy currentPolicy; - - /** Map of ProtectionDomains to PermissionCollections for this instance. */ - private Map pd2pc = null; - - /** Constructs a new <code>Policy</code> object. */ - public Policy() - { - } - - /** - * Returns the currently installed <code>Policy</code> handler. The value - * should not be cached as it can be changed any time by - * {@link #setPolicy(Policy)}. - * - * @return the current <code>Policy</code>. - * @throws SecurityException - * if a {@link SecurityManager} is installed which disallows this - * operation. - */ - public static Policy getPolicy() - { - SecurityManager sm = System.getSecurityManager(); - if (sm != null) - sm.checkPermission(new SecurityPermission("getPolicy")); - - return getCurrentPolicy(); - } - - /** - * Sets the <code>Policy</code> handler to a new value. - * - * @param policy - * the new <code>Policy</code> to use. - * @throws SecurityException - * if a {@link SecurityManager} is installed which disallows this - * operation. - */ - public static void setPolicy(Policy policy) - { - SecurityManager sm = System.getSecurityManager(); - if (sm != null) - sm.checkPermission(new SecurityPermission("setPolicy")); - - setup(policy); - currentPolicy = policy; - } - - private static void setup(final Policy policy) - { - if (policy.pd2pc == null) - policy.pd2pc = Collections.synchronizedMap(new LinkedHashMap()); - - ProtectionDomain pd = policy.getClass().getProtectionDomain(); - if (pd.getCodeSource() != null) - { - PermissionCollection pc = null; - if (currentPolicy != null) - pc = currentPolicy.getPermissions(pd); - - if (pc == null) // assume it has all - { - pc = new Permissions(); - pc.add(new AllPermission()); - } - - policy.pd2pc.put(pd, pc); // add the mapping pd -> pc - } - } - - /** - * Ensures/forces loading of the configured policy provider, while bypassing - * the {@link SecurityManager} checks for <code>"getPolicy"</code> security - * permission. Needed by {@link ProtectionDomain}. - */ - static Policy getCurrentPolicy() - { - // FIXME: The class name of the Policy provider should really be sourced - // from the "java.security" configuration file. For now, just hard-code - // a stub implementation. - if (currentPolicy == null) - { - String pp = System.getProperty ("policy.provider"); - if (pp != null) - try - { - currentPolicy = (Policy) Class.forName(pp).newInstance(); - } - catch (Exception e) - { - // Ignored. - } - - if (currentPolicy == null) - currentPolicy = new gnu.java.security.provider.DefaultPolicy(); - } - return currentPolicy; - } - - /** - * Tests if <code>currentPolicy</code> is not <code>null</code>, - * thus allowing clients to not force loading of any policy - * provider; needed by {@link ProtectionDomain}. - */ - static boolean isLoaded() - { - return currentPolicy != null; - } - - /** - * Returns the set of Permissions allowed for a given {@link CodeSource}. - * - * @param codesource - * the {@link CodeSource} for which, the caller needs to find the - * set of granted permissions. - * @return a set of permissions for {@link CodeSource} specified by the - * current <code>Policy</code>. - * @throws SecurityException - * if a {@link SecurityManager} is installed which disallows this - * operation. - */ - public abstract PermissionCollection getPermissions(CodeSource codesource); - - /** - * Returns the set of Permissions allowed for a given {@link ProtectionDomain}. - * - * @param domain - * the {@link ProtectionDomain} for which, the caller needs to find - * the set of granted permissions. - * @return a set of permissions for {@link ProtectionDomain} specified by the - * current <code>Policy.</code>. - * @since 1.4 - * @see ProtectionDomain - * @see SecureClassLoader - */ - public PermissionCollection getPermissions(ProtectionDomain domain) - { - if (domain == null) - return new Permissions(); - - if (pd2pc == null) - setup(this); - - PermissionCollection result = (PermissionCollection) pd2pc.get(domain); - if (result != null) - { - Permissions realResult = new Permissions(); - for (Enumeration e = result.elements(); e.hasMoreElements(); ) - realResult.add((Permission) e.nextElement()); - - return realResult; - } - - result = getPermissions(domain.getCodeSource()); - if (result == null) - result = new Permissions(); - - PermissionCollection pc = domain.getPermissions(); - if (pc != null) - for (Enumeration e = pc.elements(); e.hasMoreElements(); ) - result.add((Permission) e.nextElement()); - - return result; - } - - /** - * Checks if the designated {@link Permission} is granted to a designated - * {@link ProtectionDomain}. - * - * @param domain - * the {@link ProtectionDomain} to test. - * @param permission - * the {@link Permission} to check. - * @return <code>true</code> if <code>permission</code> is implied by a - * permission granted to this {@link ProtectionDomain}. Returns - * <code>false</code> otherwise. - * @since 1.4 - * @see ProtectionDomain - */ - public boolean implies(ProtectionDomain domain, Permission permission) - { - if (pd2pc == null) - setup(this); - - PermissionCollection pc = (PermissionCollection) pd2pc.get(domain); - if (pc != null) - return pc.implies(permission); - - boolean result = false; - pc = getPermissions(domain); - if (pc != null) - { - result = pc.implies(permission); - pd2pc.put(domain, pc); - } - - return result; - } - - /** - * Causes this <code>Policy</code> instance to refresh / reload its - * configuration. The method used to refresh depends on the concrete - * implementation. - */ - public abstract void refresh(); -} |