/* * Copyright (c) 2000, 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 javax.security.auth.kerberos; import java.util.*;import java.security.Permission;import java.security.BasicPermission;import java.security.PermissionCollection;import java.io.ObjectStreamField;import java.io.ObjectOutputStream;import java.io.ObjectInputStream;import java.io.IOException; /** * This class is used to restrict the usage of the Kerberos * delegation model, ie: forwardable and proxiable tickets. * <p> * The target name of this <code>Permission</code> specifies a pair of * kerberos service principals. The first is the subordinate service principal * being entrusted to use the TGT. The second service principal designates * the target service the subordinate service principal is to * interact with on behalf of the initiating KerberosPrincipal. This * latter service principal is specified to restrict the use of a * proxiable ticket. * <p> * For example, to specify the "host" service use of a forwardable TGT the * target permission is specified as follows: * <p> * <pre> *  DelegationPermission("\"host/foo.example.com@EXAMPLE.COM\" \"krbtgt/EXAMPLE.COM@EXAMPLE.COM\""); * </pre> * <p> * To give the "backup" service a proxiable nfs service ticket the target permission * might be specified: * <p> * <pre> *  DelegationPermission("\"backup/bar.example.com@EXAMPLE.COM\" \"nfs/home.EXAMPLE.COM@EXAMPLE.COM\""); * </pre> * * @since 1.4 */ public final class DelegationPermission extends BasicPermission    implements java.io.Serializable {     private static final long serialVersionUID = 883133252142523922L;     private transient String subordinate, service;     /**     * Create a new <code>DelegationPermission</code>     * with the specified subordinate and target principals.     *     * <p>     *     * @param principals the name of the subordinate and target principals     *     * @throws NullPointerException if <code>principals</code> is <code>null</code>.     * @throws IllegalArgumentException if <code>principals</code> is empty.     */    public DelegationPermission(String principals) {        super(principals);        init(principals);    }     /**     * Create a new <code>DelegationPermission</code>     * with the specified subordinate and target principals.     * <p>     *     * @param principals the name of the subordinate and target principals     * <p>     * @param actions should be null.     *     * @throws NullPointerException if <code>principals</code> is <code>null</code>.     * @throws IllegalArgumentException if <code>principals</code> is empty.     */    public DelegationPermission(String principals, String actions) {        super(principals, actions);        init(principals);    }      /**     * Initialize the DelegationPermission object.     */    private void init(String target) {         StringTokenizer t = null;        if (!target.startsWith("\"")) {            throw new IllegalArgumentException                ("service principal [" + target +                 "] syntax invalid: " +                 "improperly quoted");        } else {            t = new StringTokenizer(target, "\"", false);            subordinate = t.nextToken();            if (t.countTokens() == 2) {                t.nextToken();  // bypass whitespace                service = t.nextToken();            } else if (t.countTokens() > 0) {                throw new IllegalArgumentException                    ("service principal [" + t.nextToken() +                     "] syntax invalid: " +                     "improperly quoted");            }        }    }     /**     * Checks if this Kerberos delegation permission object "implies" the     * specified permission.     * <P>     * If none of the above are true, <code>implies</code> returns false.     * @param p the permission to check against.     *     * @return true if the specified permission is implied by this object,     * false if not.     */    public boolean implies(Permission p) {        if (!(p instanceof DelegationPermission))            return false;         DelegationPermission that = (DelegationPermission) p;        if (this.subordinate.equals(that.subordinate) &&            this.service.equals(that.service))            return true;         return false;    }      /**     * Checks two DelegationPermission objects for equality.     * <P>     * @param obj the object to test for equality with this object.     *     * @return true if <i>obj</i> is a DelegationPermission, and     *  has the same subordinate and service principal as this.     *  DelegationPermission object.     */    public boolean equals(Object obj) {        if (obj == this)            return true;         if (! (obj instanceof DelegationPermission))            return false;         DelegationPermission that = (DelegationPermission) obj;        return implies(that);    }     /**     * Returns the hash code value for this object.     *     * @return a hash code value for this object.     */     public int hashCode() {        return getName().hashCode();    }      /**     * Returns a PermissionCollection object for storing     * DelegationPermission objects.     * <br>     * DelegationPermission objects must be stored in a manner that     * allows them to be inserted into the collection in any order, but     * that also enables the PermissionCollection implies method to     * be implemented in an efficient (and consistent) manner.     *     * @return a new PermissionCollection object suitable for storing     * DelegationPermissions.     */     public PermissionCollection newPermissionCollection() {        return new KrbDelegationPermissionCollection();    }     /**     * WriteObject is called to save the state of the DelegationPermission     * to a stream. The actions are serialized, and the superclass     * takes care of the name.     */    private synchronized void writeObject(java.io.ObjectOutputStream s)        throws IOException    {        s.defaultWriteObject();    }     /**     * readObject is called to restore the state of the     * DelegationPermission from a stream.     */    private synchronized void readObject(java.io.ObjectInputStream s)         throws IOException, ClassNotFoundException    {        // Read in the action, then initialize the rest        s.defaultReadObject();        init(getName());    }     /*      public static void main(String args[]) throws Exception {      DelegationPermission this_ =      new DelegationPermission(args[0]);      DelegationPermission that_ =      new DelegationPermission(args[1]);      System.out.println("-----\n");      System.out.println("this.implies(that) = " + this_.implies(that_));      System.out.println("-----\n");      System.out.println("this = "+this_);      System.out.println("-----\n");      System.out.println("that = "+that_);      System.out.println("-----\n");       KrbDelegationPermissionCollection nps =      new KrbDelegationPermissionCollection();      nps.add(this_);      nps.add(new DelegationPermission("\"host/foo.example.com@EXAMPLE.COM\" \"CN=Gary Ellison/OU=JSN/O=SUNW/L=Palo Alto/ST=CA/C=US\""));      try {      nps.add(new DelegationPermission("host/foo.example.com@EXAMPLE.COM \"CN=Gary Ellison/OU=JSN/O=SUNW/L=Palo Alto/ST=CA/C=US\""));      } catch (Exception e) {      System.err.println(e);      }       System.out.println("nps.implies(that) = " + nps.implies(that_));      System.out.println("-----\n");       Enumeration e = nps.elements();       while (e.hasMoreElements()) {      DelegationPermission x =      (DelegationPermission) e.nextElement();      System.out.println("nps.e = " + x);      }      }    */}  final class KrbDelegationPermissionCollection extends PermissionCollection    implements java.io.Serializable {     // Not serialized; see serialization section at end of class.    private transient List<Permission> perms;     public KrbDelegationPermissionCollection() {        perms = new ArrayList<Permission>();    }      /**     * Check and see if this collection of permissions implies the permissions     * expressed in "permission".     *     * @param p the Permission object to compare     *     * @return true if "permission" is a proper subset of a permission in     * the collection, false if not.     */     public boolean implies(Permission permission) {        if (! (permission instanceof DelegationPermission))                return false;         synchronized (this) {            for (Permission x : perms) {                if (x.implies(permission))                    return true;            }        }        return false;     }     /**     * Adds a permission to the DelegationPermissions. The key for     * the hash is the name.     *     * @param permission the Permission object to add.     *     * @exception IllegalArgumentException - if the permission is not a     *                                       DelegationPermission     *     * @exception SecurityException - if this PermissionCollection object     *                                has been marked readonly     */     public void add(Permission permission) {        if (! (permission instanceof DelegationPermission))            throw new IllegalArgumentException("invalid permission: "+                                               permission);        if (isReadOnly())            throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");         synchronized (this) {            perms.add(0, permission);        }    }     /**     * Returns an enumeration of all the DelegationPermission objects     * in the container.     *     * @return an enumeration of all the DelegationPermission objects.     */     public Enumeration<Permission> elements() {        // Convert Iterator into Enumeration        synchronized (this) {            return Collections.enumeration(perms);        }    }     private static final long serialVersionUID = -3383936936589966948L;     // Need to maintain serialization interoperability with earlier releases,    // which had the serializable field:    //    private Vector permissions;    /**     * @serialField permissions java.util.Vector     *     A list of DelegationPermission objects.     */    private static final ObjectStreamField[] serialPersistentFields = {        new ObjectStreamField("permissions", Vector.class),    };     /**     * @serialData "permissions" field (a Vector containing the DelegationPermissions).     */    /*     * Writes the contents of the perms field out as a Vector for     * serialization compatibility with earlier releases.     */    private void writeObject(ObjectOutputStream out) throws IOException {        // Don't call out.defaultWriteObject()         // Write out Vector        Vector<Permission> permissions = new Vector<>(perms.size());         synchronized (this) {            permissions.addAll(perms);        }         ObjectOutputStream.PutField pfields = out.putFields();        pfields.put("permissions", permissions);        out.writeFields();    }     /*     * Reads in a Vector of DelegationPermissions and saves them in the perms field.     */    private void readObject(ObjectInputStream in) throws IOException,    ClassNotFoundException {        // Don't call defaultReadObject()         // Read in serialized fields        ObjectInputStream.GetField gfields = in.readFields();         // Get the one we want        Vector<Permission> permissions =                (Vector<Permission>)gfields.get("permissions", null);        perms = new ArrayList<Permission>(permissions.size());        perms.addAll(permissions);    }}