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jeremybenn |
/* ServicePermission.java -- kerberos service permission
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Copyright (C) 2006 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.kerberos;
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import java.security.Permission;
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import java.security.PermissionCollection;
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import java.util.Enumeration;
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import java.util.StringTokenizer;
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import java.util.Vector;
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/**
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* This represents permission to access to a Kerberos service principal.
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* See the Kerberos authentication RFC for more information:
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* <a href="http://www.ietf.org/rfc/rfc1510.txt">RFC 1510</a>.
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*
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* @since 1.4
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*/
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public final class ServicePermission
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extends Permission
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{
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// FIXME: Enable this when serialization works.
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// private static final long serialVersionUID = -1227585031618624935L;
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private static final int INITIATE = 1;
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private static final int ACCEPT = 2;
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private int flags;
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/**
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* Create a new service permission with the indicated name and actions.
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*
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* The name is the name of the kerberos principal for the service.
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*
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* The actions are a comma-separated list of strings. The recognized
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* actions are "initiate" and "accept". The "initiate" action means
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* that the holder of the permission can access the service. The
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* "accept" action means that the holder of the permission can operate
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* as this service.
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*
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* @param name the prinicpal's name
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* @param action the allowed actions
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*/
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public ServicePermission(String name, String action)
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{
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super(name);
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parseActions(action);
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}
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public boolean implies(Permission perm)
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{
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if (! (perm instanceof ServicePermission))
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return false;
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ServicePermission sp = (ServicePermission) perm;
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if ((flags & sp.flags) != sp.flags)
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return false;
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return getName().equals(sp.getName());
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}
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public boolean equals(Object obj)
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{
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if (! (obj instanceof ServicePermission))
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return false;
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ServicePermission sp = (ServicePermission) obj;
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return flags == sp.flags && getName().equals(sp.getName());
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}
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public int hashCode()
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{
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return getName().hashCode() + flags;
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}
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/**
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* Return a string representing the actions.
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*/
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public String getActions()
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{
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if (flags == (INITIATE | ACCEPT))
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return "initiate,accept";
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if (flags == INITIATE)
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return "initiate";
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if (flags == ACCEPT)
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return "accept";
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return "";
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}
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public PermissionCollection newPermissionCollection()
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{
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return new PermissionCollection()
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{
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private Vector permissions = new Vector();
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public void add(Permission perm)
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{
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if (isReadOnly())
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throw new SecurityException("readonly");
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if (! (perm instanceof ServicePermission))
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throw new IllegalArgumentException("can only add DelegationPermissions");
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permissions.add(perm);
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}
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public boolean implies(Permission perm)
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{
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if (! (perm instanceof ServicePermission))
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return false;
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Enumeration e = elements();
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while (e.hasMoreElements())
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{
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ServicePermission sp = (ServicePermission) e.nextElement();
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if (sp.implies(perm))
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return true;
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}
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return false;
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}
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public Enumeration elements()
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{
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return permissions.elements();
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}
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};
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}
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private void parseActions(String actions)
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{
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StringTokenizer tok = new StringTokenizer(actions, ",");
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while (tok.hasMoreTokens())
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{
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String token = tok.nextToken();
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if ("accept".equals(token))
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flags |= ACCEPT;
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else if ("initiate".equals(token))
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flags |= INITIATE;
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else
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throw new IllegalArgumentException("unrecognized token: " + token);
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}
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}
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}
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