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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package javax.security.auth.kerberos;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.security.BasicPermission;
import java.security.Permission;
import java.security.PermissionCollection;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* 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} 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:
*
* <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:
*
* <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}
* with the specified subordinate and target principals.
*
* @param principals the name of the subordinate and target principals
*
* @throws NullPointerException if {@code principals} is {@code null}.
* @throws IllegalArgumentException if {@code principals} is empty,
* or does not contain a pair of principals, or is improperly quoted
*/
public DelegationPermission(String principals) {
super(principals);
init(principals);
}
/**
* Create a new {@code DelegationPermission}
* with the specified subordinate and target principals.
*
* @param principals the name of the subordinate and target principals
*
* @param actions should be null.
*
* @throws NullPointerException if {@code principals} is {@code null}.
* @throws IllegalArgumentException if {@code principals} is empty,
* or does not contain a pair of principals, or is improperly quoted
*/
public DelegationPermission(String principals, String actions) {
super(principals, actions);
init(principals);
}
/**
* Initialize the DelegationPermission object.
*/
private void init(String target) {
// 7 tokens in a string:
// "subordinate@R1" "service@R2"
// 1<------2----->345<----6--->7
StringTokenizer t = new StringTokenizer(target, "\"", true);
try {
if (!t.nextToken().equals("\"")) { // 1
throw new IllegalArgumentException("Illegal input [" + target
+ "]: improperly quoted");
}
subordinate = t.nextToken(); // 2
if (subordinate.equals("\"")) {
throw new IllegalArgumentException("Illegal input [" + target
+ "]: bad subordinate name");
}
t.nextToken(); // 3
if (!t.nextToken().trim().isEmpty()) { // 4
throw new IllegalArgumentException("Illegal input [" + target
+ "]: improperly separated");
}
t.nextToken(); // 5
service = t.nextToken(); // 6
if (service.equals("\"")) {
throw new IllegalArgumentException("Illegal input [" + target
+ "]: bad service name");
}
t.nextToken(); // 7
} catch (NoSuchElementException e) {
throw new IllegalArgumentException("Illegal input [" + target
+ "]: not enough input");
}
if (t.hasMoreTokens()) {
throw new IllegalArgumentException("Illegal input [" + target
+ "]: extra input");
}
}
/**
* Checks if this Kerberos delegation permission object "implies" the
* specified permission.
* <P>
* This method returns true if this {@code DelegationPermission}
* is equal to {@code p}, and returns false otherwise.
*
* @param p the permission to check against.
*
* @return true if the specified permission is implied by this object,
* false if not.
*/
@Override
public boolean implies(Permission p) {
return equals(p);
}
/**
* Checks two DelegationPermission objects for equality.
*
* @param obj the object to test for equality with this object.
*
* @return true if {@code obj} is a DelegationPermission, and
* has the same subordinate and service principal as this
* DelegationPermission object.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof DelegationPermission)) {
return false;
}
DelegationPermission that = (DelegationPermission) obj;
return this.subordinate.equals(that.subordinate) &&
this.service.equals(that.service);
}
/**
* Returns the hash code value for this object.
*
* @return a hash code value for this object.
*/
@Override
public int hashCode() {
return 17 * subordinate.hashCode() + 31 * service.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.
*/
@Override
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());
}
}
final class KrbDelegationPermissionCollection extends PermissionCollection
implements java.io.Serializable {
// Not serialized; see serialization section at end of class.
private transient ConcurrentHashMap<Permission, Boolean> perms;
public KrbDelegationPermissionCollection() {
perms = new ConcurrentHashMap<>();
}
/**
* Check and see if this collection of permissions implies the permissions
* expressed in "permission".
*
* @param permission the Permission object to compare
*
* @return true if "permission" is a proper subset of a permission in
* the collection, false if not.
*/
@Override
public boolean implies(Permission permission) {
if (! (permission instanceof DelegationPermission))
return false;
// if map contains key, then it automatically implies it
return perms.containsKey(permission);
}
/**
* 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
*/
@Override
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");
perms.put(permission, Boolean.TRUE);
}
/**
* Returns an enumeration of all the DelegationPermission objects
* in the container.
*
* @return an enumeration of all the DelegationPermission objects.
*/
@Override
public Enumeration<Permission> elements() {
return perms.keys();
}
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),
};
/**
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