| /* |
| * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| package java.security; |
| |
| import java.io.*; |
| import java.lang.RuntimePermission; |
| import java.lang.reflect.*; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| import java.util.PropertyPermission; |
| import java.util.StringTokenizer; |
| import java.util.Vector; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.atomic.AtomicReference; |
| import sun.security.jca.GetInstance; |
| import sun.security.util.Debug; |
| import sun.security.util.SecurityConstants; |
| |
| |
| /** |
| * A Policy object is responsible for determining whether code executing |
| * in the Java runtime environment has permission to perform a |
| * security-sensitive operation. |
| * |
| * <p> There is only one Policy object installed in the runtime at any |
| * given time. A Policy object can be installed by calling the |
| * <code>setPolicy</code> method. The installed Policy object can be |
| * obtained by calling the <code>getPolicy</code> method. |
| * |
| * <p> If no Policy object has been installed in the runtime, a call to |
| * <code>getPolicy</code> installs an instance of the default Policy |
| * implementation (a default subclass implementation of this abstract class). |
| * The default Policy implementation can be changed by setting the value |
| * of the "policy.provider" security property (in the Java security properties |
| * file) to the fully qualified name of the desired Policy subclass |
| * implementation. The Java security properties file is located in the |
| * file named <JAVA_HOME>/lib/security/java.security. |
| * <JAVA_HOME> refers to the value of the java.home system property, |
| * and specifies the directory where the JRE is installed. |
| * |
| * <p> Application code can directly subclass Policy to provide a custom |
| * implementation. In addition, an instance of a Policy object can be |
| * constructed by invoking one of the <code>getInstance</code> factory methods |
| * with a standard type. The default policy type is "JavaPolicy". |
| * |
| * <p> Once a Policy instance has been installed (either by default, or by |
| * calling <code>setPolicy</code>), the Java runtime invokes its |
| * <code>implies</code> method when it needs to |
| * determine whether executing code (encapsulated in a ProtectionDomain) |
| * can perform SecurityManager-protected operations. How a Policy object |
| * retrieves its policy data is up to the Policy implementation itself. |
| * The policy data may be stored, for example, in a flat ASCII file, |
| * in a serialized binary file of the Policy class, or in a database. |
| * |
| * <p> The <code>refresh</code> method causes the policy object to |
| * refresh/reload its data. This operation is implementation-dependent. |
| * For example, if the policy object stores its data in configuration files, |
| * calling <code>refresh</code> will cause it to re-read the configuration |
| * policy files. If a refresh operation is not supported, this method does |
| * nothing. Note that refreshed policy may not have an effect on classes |
| * in a particular ProtectionDomain. This is dependent on the Policy |
| * provider's implementation of the <code>implies</code> |
| * method and its PermissionCollection caching strategy. |
| * |
| * @author Roland Schemers |
| * @author Gary Ellison |
| * @see java.security.Provider |
| * @see java.security.ProtectionDomain |
| * @see java.security.Permission |
| */ |
| |
| public abstract class Policy { |
| |
| /** |
| * A read-only empty PermissionCollection instance. |
| * @since 1.6 |
| */ |
| public static final PermissionCollection UNSUPPORTED_EMPTY_COLLECTION = |
| new UnsupportedEmptyCollection(); |
| |
| // Information about the system-wide policy. |
| private static class PolicyInfo { |
| // the system-wide policy |
| final Policy policy; |
| // a flag indicating if the system-wide policy has been initialized |
| final boolean initialized; |
| |
| PolicyInfo(Policy policy, boolean initialized) { |
| this.policy = policy; |
| this.initialized = initialized; |
| } |
| } |
| |
| // PolicyInfo is stored in an AtomicReference |
| private static AtomicReference<PolicyInfo> policy = |
| new AtomicReference<>(new PolicyInfo(null, false)); |
| |
| private static final Debug debug = Debug.getInstance("policy"); |
| |
| // Cache mapping ProtectionDomain.Key to PermissionCollection |
| private WeakHashMap<ProtectionDomain.Key, PermissionCollection> pdMapping; |
| |
| /** package private for AccessControlContext and ProtectionDomain */ |
| static boolean isSet() |
| { |
| PolicyInfo pi = policy.get(); |
| return pi.policy != null && pi.initialized == true; |
| } |
| |
| private static void checkPermission(String type) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(new SecurityPermission("createPolicy." + type)); |
| } |
| } |
| |
| /** |
| * Returns the installed Policy object. This value should not be cached, |
| * as it may be changed by a call to <code>setPolicy</code>. |
| * This method first calls |
| * <code>SecurityManager.checkPermission</code> with a |
| * <code>SecurityPermission("getPolicy")</code> permission |
| * to ensure it's ok to get the Policy object. |
| * |
| * @return the installed Policy. |
| * |
| * @throws SecurityException |
| * if a security manager exists and its |
| * <code>checkPermission</code> method doesn't allow |
| * getting the Policy object. |
| * |
| * @see SecurityManager#checkPermission(Permission) |
| * @see #setPolicy(java.security.Policy) |
| */ |
| public static Policy getPolicy() |
| { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) |
| sm.checkPermission(SecurityConstants.GET_POLICY_PERMISSION); |
| return getPolicyNoCheck(); |
| } |
| |
| /** |
| * Returns the installed Policy object, skipping the security check. |
| * Used by ProtectionDomain and getPolicy. |
| * |
| * @return the installed Policy. |
| */ |
| static Policy getPolicyNoCheck() |
| { |
| PolicyInfo pi = policy.get(); |
| // Use double-check idiom to avoid locking if system-wide policy is |
| // already initialized |
| if (pi.initialized == false || pi.policy == null) { |
| synchronized (Policy.class) { |
| PolicyInfo pinfo = policy.get(); |
| if (pinfo.policy == null) { |
| String policy_class = AccessController.doPrivileged( |
| new PrivilegedAction<String>() { |
| public String run() { |
| return Security.getProperty("policy.provider"); |
| } |
| }); |
| if (policy_class == null) { |
| policy_class = "sun.security.provider.PolicyFile"; |
| } |
| |
| try { |
| pinfo = new PolicyInfo( |
| (Policy) Class.forName(policy_class).newInstance(), |
| true); |
| } catch (Exception e) { |
| /* |
| * The policy_class seems to be an extension |
| * so we have to bootstrap loading it via a policy |
| * provider that is on the bootclasspath. |
| * If it loads then shift gears to using the configured |
| * provider. |
| */ |
| |
| // install the bootstrap provider to avoid recursion |
| Policy polFile = new sun.security.provider.PolicyFile(); |
| pinfo = new PolicyInfo(polFile, false); |
| policy.set(pinfo); |
| |
| final String pc = policy_class; |
| Policy pol = AccessController.doPrivileged( |
| new PrivilegedAction<Policy>() { |
| public Policy run() { |
| try { |
| ClassLoader cl = |
| ClassLoader.getSystemClassLoader(); |
| // we want the extension loader |
| ClassLoader extcl = null; |
| while (cl != null) { |
| extcl = cl; |
| cl = cl.getParent(); |
| } |
| return (extcl != null ? (Policy)Class.forName( |
| pc, true, extcl).newInstance() : null); |
| } catch (Exception e) { |
| if (debug != null) { |
| debug.println("policy provider " + |
| pc + |
| " not available"); |
| e.printStackTrace(); |
| } |
| return null; |
| } |
| } |
| }); |
| /* |
| * if it loaded install it as the policy provider. Otherwise |
| * continue to use the system default implementation |
| */ |
| if (pol != null) { |
| pinfo = new PolicyInfo(pol, true); |
| } else { |
| if (debug != null) { |
| debug.println("using sun.security.provider.PolicyFile"); |
| } |
| pinfo = new PolicyInfo(polFile, true); |
| } |
| } |
| policy.set(pinfo); |
| } |
| return pinfo.policy; |
| } |
| } |
| return pi.policy; |
| } |
| |
| /** |
| * Sets the system-wide Policy object. This method first calls |
| * <code>SecurityManager.checkPermission</code> with a |
| * <code>SecurityPermission("setPolicy")</code> |
| * permission to ensure it's ok to set the Policy. |
| * |
| * @param p the new system Policy object. |
| * |
| * @throws SecurityException |
| * if a security manager exists and its |
| * <code>checkPermission</code> method doesn't allow |
| * setting the Policy. |
| * |
| * @see SecurityManager#checkPermission(Permission) |
| * @see #getPolicy() |
| * |
| */ |
| public static void setPolicy(Policy p) |
| { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) sm.checkPermission( |
| new SecurityPermission("setPolicy")); |
| if (p != null) { |
| initPolicy(p); |
| } |
| synchronized (Policy.class) { |
| policy.set(new PolicyInfo(p, p != null)); |
| } |
| } |
| |
| /** |
| * Initialize superclass state such that a legacy provider can |
| * handle queries for itself. |
| * |
| * @since 1.4 |
| */ |
| private static void initPolicy (final Policy p) { |
| /* |
| * A policy provider not on the bootclasspath could trigger |
| * security checks fulfilling a call to either Policy.implies |
| * or Policy.getPermissions. If this does occur the provider |
| * must be able to answer for it's own ProtectionDomain |
| * without triggering additional security checks, otherwise |
| * the policy implementation will end up in an infinite |
| * recursion. |
| * |
| * To mitigate this, the provider can collect it's own |
| * ProtectionDomain and associate a PermissionCollection while |
| * it is being installed. The currently installed policy |
| * provider (if there is one) will handle calls to |
| * Policy.implies or Policy.getPermissions during this |
| * process. |
| * |
| * This Policy superclass caches away the ProtectionDomain and |
| * statically binds permissions so that legacy Policy |
| * implementations will continue to function. |
| */ |
| |
| ProtectionDomain policyDomain = |
| AccessController.doPrivileged(new PrivilegedAction<ProtectionDomain>() { |
| public ProtectionDomain run() { |
| return p.getClass().getProtectionDomain(); |
| } |
| }); |
| |
| /* |
| * Collect the permissions granted to this protection domain |
| * so that the provider can be security checked while processing |
| * calls to Policy.implies or Policy.getPermissions. |
| */ |
| PermissionCollection policyPerms = null; |
| synchronized (p) { |
| if (p.pdMapping == null) { |
| p.pdMapping = new WeakHashMap<>(); |
| } |
| } |
| |
| if (policyDomain.getCodeSource() != null) { |
| Policy pol = policy.get().policy; |
| if (pol != null) { |
| policyPerms = pol.getPermissions(policyDomain); |
| } |
| |
| if (policyPerms == null) { // assume it has all |
| policyPerms = new Permissions(); |
| policyPerms.add(SecurityConstants.ALL_PERMISSION); |
| } |
| |
| synchronized (p.pdMapping) { |
| // cache of pd to permissions |
| p.pdMapping.put(policyDomain.key, policyPerms); |
| } |
| } |
| return; |
| } |
| |
| |
| /** |
| * Returns a Policy object of the specified type. |
| * |
| * <p> This method traverses the list of registered security providers, |
| * starting with the most preferred Provider. |
| * A new Policy object encapsulating the |
| * PolicySpi implementation from the first |
| * Provider that supports the specified type is returned. |
| * |
| * <p> Note that the list of registered providers may be retrieved via |
| * the {@link Security#getProviders() Security.getProviders()} method. |
| * |
| * @param type the specified Policy type. See the Policy section in the |
| * <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Policy"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for a list of standard Policy types. |
| * |
| * @param params parameters for the Policy, which may be null. |
| * |
| * @return the new Policy object. |
| * |
| * @exception SecurityException if the caller does not have permission |
| * to get a Policy instance for the specified type. |
| * |
| * @exception NullPointerException if the specified type is null. |
| * |
| * @exception IllegalArgumentException if the specified parameters |
| * are not understood by the PolicySpi implementation |
| * from the selected Provider. |
| * |
| * @exception NoSuchAlgorithmException if no Provider supports a PolicySpi |
| * implementation for the specified type. |
| * |
| * @see Provider |
| * @since 1.6 |
| */ |
| public static Policy getInstance(String type, Policy.Parameters params) |
| throws NoSuchAlgorithmException { |
| |
| checkPermission(type); |
| try { |
| GetInstance.Instance instance = GetInstance.getInstance("Policy", |
| PolicySpi.class, |
| type, |
| params); |
| return new PolicyDelegate((PolicySpi)instance.impl, |
| instance.provider, |
| type, |
| params); |
| } catch (NoSuchAlgorithmException nsae) { |
| return handleException(nsae); |
| } |
| } |
| |
| /** |
| * Returns a Policy object of the specified type. |
| * |
| * <p> A new Policy object encapsulating the |
| * PolicySpi implementation from the specified provider |
| * is returned. The specified provider must be registered |
| * in the provider list. |
| * |
| * <p> Note that the list of registered providers may be retrieved via |
| * the {@link Security#getProviders() Security.getProviders()} method. |
| * |
| * @param type the specified Policy type. See the Policy section in the |
| * <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Policy"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for a list of standard Policy types. |
| * |
| * @param params parameters for the Policy, which may be null. |
| * |
| * @param provider the provider. |
| * |
| * @return the new Policy object. |
| * |
| * @exception SecurityException if the caller does not have permission |
| * to get a Policy instance for the specified type. |
| * |
| * @exception NullPointerException if the specified type is null. |
| * |
| * @exception IllegalArgumentException if the specified provider |
| * is null or empty, |
| * or if the specified parameters are not understood by |
| * the PolicySpi implementation from the specified provider. |
| * |
| * @exception NoSuchProviderException if the specified provider is not |
| * registered in the security provider list. |
| * |
| * @exception NoSuchAlgorithmException if the specified provider does not |
| * support a PolicySpi implementation for the specified type. |
| * |
| * @see Provider |
| * @since 1.6 |
| */ |
| public static Policy getInstance(String type, |
| Policy.Parameters params, |
| String provider) |
| throws NoSuchProviderException, NoSuchAlgorithmException { |
| |
| if (provider == null || provider.length() == 0) { |
| throw new IllegalArgumentException("missing provider"); |
| } |
| |
| checkPermission(type); |
| try { |
| GetInstance.Instance instance = GetInstance.getInstance("Policy", |
| PolicySpi.class, |
| type, |
| params, |
| provider); |
| return new PolicyDelegate((PolicySpi)instance.impl, |
| instance.provider, |
| type, |
| params); |
| } catch (NoSuchAlgorithmException nsae) { |
| return handleException(nsae); |
| } |
| } |
| |
| /** |
| * Returns a Policy object of the specified type. |
| * |
| * <p> A new Policy object encapsulating the |
| * PolicySpi implementation from the specified Provider |
| * object is returned. Note that the specified Provider object |
| * does not have to be registered in the provider list. |
| * |
| * @param type the specified Policy type. See the Policy section in the |
| * <a href= |
| * "{@docRoot}/../technotes/guides/security/StandardNames.html#Policy"> |
| * Java Cryptography Architecture Standard Algorithm Name Documentation</a> |
| * for a list of standard Policy types. |
| * |
| * @param params parameters for the Policy, which may be null. |
| * |
| * @param provider the Provider. |
| * |
| * @return the new Policy object. |
| * |
| * @exception SecurityException if the caller does not have permission |
| * to get a Policy instance for the specified type. |
| * |
| * @exception NullPointerException if the specified type is null. |
| * |
| * @exception IllegalArgumentException if the specified Provider is null, |
| * or if the specified parameters are not understood by |
| * the PolicySpi implementation from the specified Provider. |
| * |
| * @exception NoSuchAlgorithmException if the specified Provider does not |
| * support a PolicySpi implementation for the specified type. |
| * |
| * @see Provider |
| * @since 1.6 |
| */ |
| public static Policy getInstance(String type, |
| Policy.Parameters params, |
| Provider provider) |
| throws NoSuchAlgorithmException { |
| |
| if (provider == null) { |
| throw new IllegalArgumentException("missing provider"); |
| } |
| |
| checkPermission(type); |
| try { |
| GetInstance.Instance instance = GetInstance.getInstance("Policy", |
| PolicySpi.class, |
| type, |
| params, |
| provider); |
| return new PolicyDelegate((PolicySpi)instance.impl, |
| instance.provider, |
| type, |
| params); |
| } catch (NoSuchAlgorithmException nsae) { |
| return handleException(nsae); |
| } |
| } |
| |
| private static Policy handleException(NoSuchAlgorithmException nsae) |
| throws NoSuchAlgorithmException { |
| Throwable cause = nsae.getCause(); |
| if (cause instanceof IllegalArgumentException) { |
| throw (IllegalArgumentException)cause; |
| } |
| throw nsae; |
| } |
| |
| /** |
| * Return the Provider of this Policy. |
| * |
| * <p> This Policy instance will only have a Provider if it |
| * was obtained via a call to <code>Policy.getInstance</code>. |
| * Otherwise this method returns null. |
| * |
| * @return the Provider of this Policy, or null. |
| * |
| * @since 1.6 |
| */ |
| public Provider getProvider() { |
| return null; |
| } |
| |
| /** |
| * Return the type of this Policy. |
| * |
| * <p> This Policy instance will only have a type if it |
| * was obtained via a call to <code>Policy.getInstance</code>. |
| * Otherwise this method returns null. |
| * |
| * @return the type of this Policy, or null. |
| * |
| * @since 1.6 |
| */ |
| public String getType() { |
| return null; |
| } |
| |
| /** |
| * Return Policy parameters. |
| * |
| * <p> This Policy instance will only have parameters if it |
| * was obtained via a call to <code>Policy.getInstance</code>. |
| * Otherwise this method returns null. |
| * |
| * @return Policy parameters, or null. |
| * |
| * @since 1.6 |
| */ |
| public Policy.Parameters getParameters() { |
| return null; |
| } |
| |
| /** |
| * Return a PermissionCollection object containing the set of |
| * permissions granted to the specified CodeSource. |
| * |
| * <p> Applications are discouraged from calling this method |
| * since this operation may not be supported by all policy implementations. |
| * Applications should solely rely on the <code>implies</code> method |
| * to perform policy checks. If an application absolutely must call |
| * a getPermissions method, it should call |
| * <code>getPermissions(ProtectionDomain)</code>. |
| * |
| * <p> The default implementation of this method returns |
| * Policy.UNSUPPORTED_EMPTY_COLLECTION. This method can be |
| * overridden if the policy implementation can return a set of |
| * permissions granted to a CodeSource. |
| * |
| * @param codesource the CodeSource to which the returned |
| * PermissionCollection has been granted. |
| * |
| * @return a set of permissions granted to the specified CodeSource. |
| * If this operation is supported, the returned |
| * set of permissions must be a new mutable instance |
| * and it must support heterogeneous Permission types. |
| * If this operation is not supported, |
| * Policy.UNSUPPORTED_EMPTY_COLLECTION is returned. |
| */ |
| public PermissionCollection getPermissions(CodeSource codesource) { |
| return Policy.UNSUPPORTED_EMPTY_COLLECTION; |
| } |
| |
| /** |
| * Return a PermissionCollection object containing the set of |
| * permissions granted to the specified ProtectionDomain. |
| * |
| * <p> Applications are discouraged from calling this method |
| * since this operation may not be supported by all policy implementations. |
| * Applications should rely on the <code>implies</code> method |
| * to perform policy checks. |
| * |
| * <p> The default implementation of this method first retrieves |
| * the permissions returned via <code>getPermissions(CodeSource)</code> |
| * (the CodeSource is taken from the specified ProtectionDomain), |
| * as well as the permissions located inside the specified ProtectionDomain. |
| * All of these permissions are then combined and returned in a new |
| * PermissionCollection object. If <code>getPermissions(CodeSource)</code> |
| * returns Policy.UNSUPPORTED_EMPTY_COLLECTION, then this method |
| * returns the permissions contained inside the specified ProtectionDomain |
| * in a new PermissionCollection object. |
| * |
| * <p> This method can be overridden if the policy implementation |
| * supports returning a set of permissions granted to a ProtectionDomain. |
| * |
| * @param domain the ProtectionDomain to which the returned |
| * PermissionCollection has been granted. |
| * |
| * @return a set of permissions granted to the specified ProtectionDomain. |
| * If this operation is supported, the returned |
| * set of permissions must be a new mutable instance |
| * and it must support heterogeneous Permission types. |
| * If this operation is not supported, |
| * Policy.UNSUPPORTED_EMPTY_COLLECTION is returned. |
| * |
| * @since 1.4 |
| */ |
| public PermissionCollection getPermissions(ProtectionDomain domain) { |
| PermissionCollection pc = null; |
| |
| if (domain == null) |
| return new Permissions(); |
| |
| if (pdMapping == null) { |
| initPolicy(this); |
| } |
| |
| synchronized (pdMapping) { |
| pc = pdMapping.get(domain.key); |
| } |
| |
| if (pc != null) { |
| Permissions perms = new Permissions(); |
| synchronized (pc) { |
| for (Enumeration<Permission> e = pc.elements() ; e.hasMoreElements() ;) { |
| perms.add(e.nextElement()); |
| } |
| } |
| return perms; |
| } |
| |
| pc = getPermissions(domain.getCodeSource()); |
| if (pc == null || pc == UNSUPPORTED_EMPTY_COLLECTION) { |
| pc = new Permissions(); |
| } |
| |
| addStaticPerms(pc, domain.getPermissions()); |
| return pc; |
| } |
| |
| /** |
| * add static permissions to provided permission collection |
| */ |
| private void addStaticPerms(PermissionCollection perms, |
| PermissionCollection statics) { |
| if (statics != null) { |
| synchronized (statics) { |
| Enumeration<Permission> e = statics.elements(); |
| while (e.hasMoreElements()) { |
| perms.add(e.nextElement()); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Evaluates the global policy for the permissions granted to |
| * the ProtectionDomain and tests whether the permission is |
| * granted. |
| * |
| * @param domain the ProtectionDomain to test |
| * @param permission the Permission object to be tested for implication. |
| * |
| * @return true if "permission" is a proper subset of a permission |
| * granted to this ProtectionDomain. |
| * |
| * @see java.security.ProtectionDomain |
| * @since 1.4 |
| */ |
| public boolean implies(ProtectionDomain domain, Permission permission) { |
| PermissionCollection pc; |
| |
| if (pdMapping == null) { |
| initPolicy(this); |
| } |
| |
| synchronized (pdMapping) { |
| pc = pdMapping.get(domain.key); |
| } |
| |
| if (pc != null) { |
| return pc.implies(permission); |
| } |
| |
| pc = getPermissions(domain); |
| if (pc == null) { |
| return false; |
| } |
| |
| synchronized (pdMapping) { |
| // cache it |
| pdMapping.put(domain.key, pc); |
| } |
| |
| return pc.implies(permission); |
| } |
| |
| /** |
| * Refreshes/reloads the policy configuration. The behavior of this method |
| * depends on the implementation. For example, calling <code>refresh</code> |
| * on a file-based policy will cause the file to be re-read. |
| * |
| * <p> The default implementation of this method does nothing. |
| * This method should be overridden if a refresh operation is supported |
| * by the policy implementation. |
| */ |
| public void refresh() { } |
| |
| /** |
| * This subclass is returned by the getInstance calls. All Policy calls |
| * are delegated to the underlying PolicySpi. |
| */ |
| private static class PolicyDelegate extends Policy { |
| |
| private PolicySpi spi; |
| private Provider p; |
| private String type; |
| private Policy.Parameters params; |
| |
| private PolicyDelegate(PolicySpi spi, Provider p, |
| String type, Policy.Parameters params) { |
| this.spi = spi; |
| this.p = p; |
| this.type = type; |
| this.params = params; |
| } |
| |
| @Override public String getType() { return type; } |
| |
| @Override public Policy.Parameters getParameters() { return params; } |
| |
| @Override public Provider getProvider() { return p; } |
| |
| @Override |
| public PermissionCollection getPermissions(CodeSource codesource) { |
| return spi.engineGetPermissions(codesource); |
| } |
| @Override |
| public PermissionCollection getPermissions(ProtectionDomain domain) { |
| return spi.engineGetPermissions(domain); |
| } |
| @Override |
| public boolean implies(ProtectionDomain domain, Permission perm) { |
| return spi.engineImplies(domain, perm); |
| } |
| @Override |
| public void refresh() { |
| spi.engineRefresh(); |
| } |
| } |
| |
| /** |
| * This represents a marker interface for Policy parameters. |
| * |
| * @since 1.6 |
| */ |
| public static interface Parameters { } |
| |
| /** |
| * This class represents a read-only empty PermissionCollection object that |
| * is returned from the <code>getPermissions(CodeSource)</code> and |
| * <code>getPermissions(ProtectionDomain)</code> |
| * methods in the Policy class when those operations are not |
| * supported by the Policy implementation. |
| */ |
| private static class UnsupportedEmptyCollection |
| extends PermissionCollection { |
| |
| private Permissions perms; |
| |
| /** |
| * Create a read-only empty PermissionCollection object. |
| */ |
| public UnsupportedEmptyCollection() { |
| this.perms = new Permissions(); |
| perms.setReadOnly(); |
| } |
| |
| /** |
| * Adds a permission object to the current collection of permission |
| * objects. |
| * |
| * @param permission the Permission object to add. |
| * |
| * @exception SecurityException - if this PermissionCollection object |
| * has been marked readonly |
| */ |
| @Override public void add(Permission permission) { |
| perms.add(permission); |
| } |
| |
| /** |
| * Checks to see if the specified permission is implied by the |
| * collection of Permission objects held in this PermissionCollection. |
| * |
| * @param permission the Permission object to compare. |
| * |
| * @return true if "permission" is implied by the permissions in |
| * the collection, false if not. |
| */ |
| @Override public boolean implies(Permission permission) { |
| return perms.implies(permission); |
| } |
| |
| /** |
| * Returns an enumeration of all the Permission objects in the |
| * collection. |
| * |
| * @return an enumeration of all the Permissions. |
| */ |
| @Override public Enumeration<Permission> elements() { |
| return perms.elements(); |
| } |
| } |
| } |
