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jeremybenn |
/* Subject.java -- a single entity in the system.
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Copyright (C) 2004, 2005 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 javax.security.auth;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.Serializable;
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import java.security.AccessControlContext;
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import java.security.AccessController;
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import java.security.DomainCombiner;
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import java.security.Principal;
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import java.security.PrivilegedAction;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import java.util.AbstractSet;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.Set;
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public final class Subject implements Serializable
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{
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// Fields.
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// -------------------------------------------------------------------------
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private static final long serialVersionUID = -8308522755600156056L;
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/**
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* @serial The set of principals. The type of this field is SecureSet, a
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* private inner class.
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*/
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private final Set principals;
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/**
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* @serial The read-only flag.
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*/
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private boolean readOnly;
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private final transient SecureSet pubCred;
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private final transient SecureSet privCred;
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// Constructors.
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// -------------------------------------------------------------------------
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public Subject()
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{
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principals = new SecureSet (this, SecureSet.PRINCIPALS);
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pubCred = new SecureSet (this, SecureSet.PUBLIC_CREDENTIALS);
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privCred = new SecureSet (this, SecureSet.PRIVATE_CREDENTIALS);
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readOnly = false;
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}
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public Subject (final boolean readOnly,
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final Set<? extends Principal> principals,
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final Set<?> pubCred, final Set<?> privCred)
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{
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if (principals == null || pubCred == null || privCred == null)
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{
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throw new NullPointerException();
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}
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this.principals = new SecureSet (this, SecureSet.PRINCIPALS, principals);
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this.pubCred = new SecureSet (this, SecureSet.PUBLIC_CREDENTIALS, pubCred);
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this.privCred = new SecureSet (this, SecureSet.PRIVATE_CREDENTIALS, privCred);
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this.readOnly = readOnly;
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}
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// Class methods.
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// -------------------------------------------------------------------------
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/**
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* <p>Returns the subject associated with the given {@link
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* AccessControlContext}.</p>
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*
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* <p>All this method does is retrieve the Subject object from the supplied
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* context's {@link DomainCombiner}, if any, and if it is an instance of
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* a {@link SubjectDomainCombiner}.
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*
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* @param context The context to retrieve the subject from.
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* @return The subject assoctiated with the context, or <code>null</code>
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* if there is none.
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* @throws NullPointerException If <i>subject</i> is null.
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* @throws SecurityException If the caller does not have permission to get
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* the subject (<code>"getSubject"</code> target of {@link AuthPermission}.
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*/
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public static Subject getSubject (final AccessControlContext context)
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("getSubject"));
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}
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DomainCombiner dc = context.getDomainCombiner();
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if (!(dc instanceof SubjectDomainCombiner))
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{
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return null;
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}
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return ((SubjectDomainCombiner) dc).getSubject();
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}
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/**
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* <p>Run a method as another subject. This method will obtain the current
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* {@link AccessControlContext} for this thread, then creates another with
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* a {@link SubjectDomainCombiner} with the given subject. The supplied
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* action will then be run with the modified context.</p>
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*
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* @param subject The subject to run as.
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* @param action The action to run.
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* @return The value returned by the privileged action.
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* @throws SecurityException If the caller is not allowed to run under a
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* different identity (<code>"doAs"</code> target of {@link AuthPermission}.
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*/
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public static Object doAs (final Subject subject, final PrivilegedAction action)
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("doAs"));
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}
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AccessControlContext context =
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new AccessControlContext (AccessController.getContext(),
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new SubjectDomainCombiner (subject));
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return AccessController.doPrivileged (action, context);
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}
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/**
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* <p>Run a method as another subject. This method will obtain the current
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* {@link AccessControlContext} for this thread, then creates another with
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* a {@link SubjectDomainCombiner} with the given subject. The supplied
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* action will then be run with the modified context.</p>
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*
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* @param subject The subject to run as.
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* @param action The action to run.
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* @return The value returned by the privileged action.
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* @throws SecurityException If the caller is not allowed to run under a
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* different identity (<code>"doAs"</code> target of {@link AuthPermission}.
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* @throws PrivilegedActionException If the action throws an exception.
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*/
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public static Object doAs (final Subject subject,
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final PrivilegedExceptionAction action)
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throws PrivilegedActionException
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("doAs"));
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}
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AccessControlContext context =
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new AccessControlContext (AccessController.getContext(),
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new SubjectDomainCombiner(subject));
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return AccessController.doPrivileged (action, context);
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}
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/**
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* <p>Run a method as another subject. This method will create a new
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* {@link AccessControlContext} derived from the given one, with a
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* {@link SubjectDomainCombiner} with the given subject. The supplied
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* action will then be run with the modified context.</p>
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*
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* @param subject The subject to run as.
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* @param action The action to run.
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* @param acc The context to use.
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* @return The value returned by the privileged action.
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* @throws SecurityException If the caller is not allowed to run under a
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* different identity (<code>"doAsPrivileged"</code> target of {@link
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* AuthPermission}.
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*/
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public static Object doAsPrivileged (final Subject subject,
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final PrivilegedAction action,
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final AccessControlContext acc)
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("doAsPrivileged"));
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}
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AccessControlContext context =
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new AccessControlContext (acc, new SubjectDomainCombiner (subject));
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return AccessController.doPrivileged (action, context);
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}
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/**
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* <p>Run a method as another subject. This method will create a new
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* {@link AccessControlContext} derived from the given one, with a
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* {@link SubjectDomainCombiner} with the given subject. The supplied
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* action will then be run with the modified context.</p>
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*
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* @param subject The subject to run as.
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* @param action The action to run.
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* @param acc The context to use.
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* @return The value returned by the privileged action.
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* @throws SecurityException If the caller is not allowed to run under a
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* different identity (<code>"doAsPrivileged"</code> target of
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* {@link AuthPermission}.
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* @throws PrivilegedActionException If the action throws an exception.
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*/
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public static Object doAsPrivileged (final Subject subject,
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final PrivilegedExceptionAction action,
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AccessControlContext acc)
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throws PrivilegedActionException
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("doAsPrivileged"));
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}
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if (acc == null)
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acc = new AccessControlContext (new java.security.ProtectionDomain[0]);
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AccessControlContext context =
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new AccessControlContext (acc, new SubjectDomainCombiner (subject));
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return AccessController.doPrivileged (action, context);
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}
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// Instance methods.
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// -------------------------------------------------------------------------
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public boolean equals (Object o)
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{
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if (!(o instanceof Subject))
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{
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return false;
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}
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Subject that = (Subject) o;
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return principals.containsAll (that.getPrincipals()) &&
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pubCred.containsAll (that.getPublicCredentials()) &&
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privCred.containsAll (that.getPrivateCredentials());
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}
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public Set<Principal> getPrincipals()
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{
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return principals;
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}
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public <T extends Principal> Set<T> getPrincipals(Class<T> clazz)
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{
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HashSet result = new HashSet (principals.size());
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for (Iterator it = principals.iterator(); it.hasNext(); )
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{
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Object o = it.next();
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if (o != null && clazz.isAssignableFrom (o.getClass()))
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{
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result.add(o);
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}
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}
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return Collections.unmodifiableSet (result);
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}
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public Set<Object> getPrivateCredentials()
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{
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return privCred;
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}
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public <T> Set<T> getPrivateCredentials (Class<T> clazz)
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{
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HashSet result = new HashSet (privCred.size());
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for (Iterator it = privCred.iterator(); it.hasNext(); )
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{
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Object o = it.next();
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if (o != null && clazz.isAssignableFrom (o.getClass()))
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{
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result.add(o);
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}
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}
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return Collections.unmodifiableSet (result);
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}
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public Set<Object> getPublicCredentials()
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{
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return pubCred;
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}
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public <T> Set<T> getPublicCredentials (Class<T> clazz)
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{
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HashSet result = new HashSet (pubCred.size());
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for (Iterator it = pubCred.iterator(); it.hasNext(); )
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{
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Object o = it.next();
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if (o != null && clazz.isAssignableFrom (o.getClass()))
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{
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result.add(o);
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}
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}
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return Collections.unmodifiableSet (result);
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}
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public int hashCode()
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{
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return principals.hashCode() + privCred.hashCode() + pubCred.hashCode();
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}
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/**
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* <p>Returns whether or not this subject is read-only.</p>
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*
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* @return True is this subject is read-only.
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*/
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public boolean isReadOnly()
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{
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return readOnly;
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}
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/**
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* <p>Marks this subject as read-only.</p>
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*
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* @throws SecurityException If the caller does not have permission to
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* set this subject as read-only (<code>"setReadOnly"</code> target of
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* {@link AuthPermission}.
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*/
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public void setReadOnly()
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{
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final SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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{
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sm.checkPermission (new AuthPermission ("setReadOnly"));
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}
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readOnly = true;
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}
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public String toString()
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{
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return Subject.class.getName() + " [ principals=" + principals +
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", private credentials=" + privCred + ", public credentials=" +
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pubCred + ", read-only=" + readOnly + " ]";
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}
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364 |
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365 |
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// Inner class.
|
366 |
|
|
// -------------------------------------------------------------------------
|
367 |
|
|
|
368 |
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|
/**
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369 |
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* An undocumented inner class that is used for sets in the parent class.
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370 |
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*/
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371 |
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private static class SecureSet extends AbstractSet implements Serializable
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372 |
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{
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373 |
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// Fields.
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374 |
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// -----------------------------------------------------------------------
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375 |
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376 |
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private static final long serialVersionUID = 7911754171111800359L;
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377 |
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378 |
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static final int PRINCIPALS = 0;
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379 |
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static final int PUBLIC_CREDENTIALS = 1;
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380 |
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static final int PRIVATE_CREDENTIALS = 2;
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381 |
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382 |
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private final Subject subject;
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383 |
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private final LinkedList elements;
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384 |
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private final transient int type;
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385 |
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386 |
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// Constructors.
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387 |
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// -----------------------------------------------------------------------
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388 |
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389 |
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SecureSet (final Subject subject, final int type, final Collection inElements)
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390 |
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{
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391 |
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this (subject, type);
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392 |
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for (Iterator it = inElements.iterator(); it.hasNext(); )
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393 |
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{
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394 |
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Object o = it.next();
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395 |
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if (type == PRINCIPALS && !(o instanceof Principal))
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396 |
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{
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397 |
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throw new IllegalArgumentException(o+" is not a Principal");
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398 |
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}
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399 |
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if (!this.elements.contains (o))
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400 |
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{
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401 |
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this.elements.add (o);
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402 |
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}
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403 |
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}
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404 |
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}
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405 |
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406 |
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SecureSet (final Subject subject, final int type)
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407 |
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{
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408 |
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this.subject = subject;
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409 |
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this.type = type;
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410 |
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this.elements = new LinkedList();
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411 |
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}
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412 |
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413 |
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// Instance methods.
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414 |
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// -----------------------------------------------------------------------
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415 |
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|
416 |
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public synchronized int size()
|
417 |
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{
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418 |
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return elements.size();
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419 |
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}
|
420 |
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|
421 |
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public Iterator iterator()
|
422 |
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{
|
423 |
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return elements.iterator();
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424 |
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}
|
425 |
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|
426 |
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public synchronized boolean add(Object element)
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427 |
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{
|
428 |
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if (subject.isReadOnly())
|
429 |
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{
|
430 |
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throw new IllegalStateException ("subject is read-only");
|
431 |
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}
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432 |
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final SecurityManager sm = System.getSecurityManager();
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433 |
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switch (type)
|
434 |
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{
|
435 |
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case PRINCIPALS:
|
436 |
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if (sm != null)
|
437 |
|
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{
|
438 |
|
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sm.checkPermission (new AuthPermission ("modifyPrincipals"));
|
439 |
|
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}
|
440 |
|
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if (!(element instanceof Principal))
|
441 |
|
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{
|
442 |
|
|
throw new IllegalArgumentException ("element is not a Principal");
|
443 |
|
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}
|
444 |
|
|
break;
|
445 |
|
|
|
446 |
|
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case PUBLIC_CREDENTIALS:
|
447 |
|
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if (sm != null)
|
448 |
|
|
{
|
449 |
|
|
sm.checkPermission (new AuthPermission ("modifyPublicCredentials"));
|
450 |
|
|
}
|
451 |
|
|
break;
|
452 |
|
|
|
453 |
|
|
case PRIVATE_CREDENTIALS:
|
454 |
|
|
if (sm != null)
|
455 |
|
|
{
|
456 |
|
|
sm.checkPermission (new AuthPermission ("modifyPrivateCredentials"));
|
457 |
|
|
}
|
458 |
|
|
break;
|
459 |
|
|
|
460 |
|
|
default:
|
461 |
|
|
throw new Error ("this statement should be unreachable");
|
462 |
|
|
}
|
463 |
|
|
|
464 |
|
|
if (elements.contains (element))
|
465 |
|
|
{
|
466 |
|
|
return false;
|
467 |
|
|
}
|
468 |
|
|
|
469 |
|
|
return elements.add (element);
|
470 |
|
|
}
|
471 |
|
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|
472 |
|
|
public synchronized boolean remove (final Object element)
|
473 |
|
|
{
|
474 |
|
|
if (subject.isReadOnly())
|
475 |
|
|
{
|
476 |
|
|
throw new IllegalStateException ("subject is read-only");
|
477 |
|
|
}
|
478 |
|
|
final SecurityManager sm = System.getSecurityManager();
|
479 |
|
|
switch (type)
|
480 |
|
|
{
|
481 |
|
|
case PRINCIPALS:
|
482 |
|
|
if (sm != null)
|
483 |
|
|
{
|
484 |
|
|
sm.checkPermission (new AuthPermission ("modifyPrincipals"));
|
485 |
|
|
}
|
486 |
|
|
if (!(element instanceof Principal))
|
487 |
|
|
{
|
488 |
|
|
throw new IllegalArgumentException ("element is not a Principal");
|
489 |
|
|
}
|
490 |
|
|
break;
|
491 |
|
|
|
492 |
|
|
case PUBLIC_CREDENTIALS:
|
493 |
|
|
if (sm != null)
|
494 |
|
|
{
|
495 |
|
|
sm.checkPermission (new AuthPermission ("modifyPublicCredentials"));
|
496 |
|
|
}
|
497 |
|
|
break;
|
498 |
|
|
|
499 |
|
|
case PRIVATE_CREDENTIALS:
|
500 |
|
|
if (sm != null)
|
501 |
|
|
{
|
502 |
|
|
sm.checkPermission (new AuthPermission ("modifyPrivateCredentials"));
|
503 |
|
|
}
|
504 |
|
|
break;
|
505 |
|
|
|
506 |
|
|
default:
|
507 |
|
|
throw new Error("this statement should be unreachable");
|
508 |
|
|
}
|
509 |
|
|
|
510 |
|
|
return elements.remove(element);
|
511 |
|
|
}
|
512 |
|
|
|
513 |
|
|
public synchronized boolean contains (final Object element)
|
514 |
|
|
{
|
515 |
|
|
return elements.contains (element);
|
516 |
|
|
}
|
517 |
|
|
|
518 |
|
|
public boolean removeAll (final Collection c)
|
519 |
|
|
{
|
520 |
|
|
if (subject.isReadOnly())
|
521 |
|
|
{
|
522 |
|
|
throw new IllegalStateException ("subject is read-only");
|
523 |
|
|
}
|
524 |
|
|
return super.removeAll (c);
|
525 |
|
|
}
|
526 |
|
|
|
527 |
|
|
public boolean retainAll (final Collection c)
|
528 |
|
|
{
|
529 |
|
|
if (subject.isReadOnly())
|
530 |
|
|
{
|
531 |
|
|
throw new IllegalStateException ("subject is read-only");
|
532 |
|
|
}
|
533 |
|
|
return super.retainAll (c);
|
534 |
|
|
}
|
535 |
|
|
|
536 |
|
|
public void clear()
|
537 |
|
|
{
|
538 |
|
|
if (subject.isReadOnly())
|
539 |
|
|
{
|
540 |
|
|
throw new IllegalStateException ("subject is read-only");
|
541 |
|
|
}
|
542 |
|
|
elements.clear();
|
543 |
|
|
}
|
544 |
|
|
|
545 |
|
|
private synchronized void writeObject (ObjectOutputStream out)
|
546 |
|
|
throws IOException
|
547 |
|
|
{
|
548 |
|
|
throw new UnsupportedOperationException ("FIXME: determine serialization");
|
549 |
|
|
}
|
550 |
|
|
|
551 |
|
|
private void readObject (ObjectInputStream in)
|
552 |
|
|
throws ClassNotFoundException, IOException
|
553 |
|
|
{
|
554 |
|
|
throw new UnsupportedOperationException ("FIXME: determine serialization");
|
555 |
|
|
}
|
556 |
|
|
}
|
557 |
|
|
}
|