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/*
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* Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.security.auth.kerberos;
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import java.util.*;
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import java.security.Permission;
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import java.security.PermissionCollection;
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import java.io.ObjectStreamField;
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import java.io.ObjectOutputStream;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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/**
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* This class is used to protect Kerberos services and the
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* credentials necessary to access those services. There is a one to
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* one mapping of a service principal and the credentials necessary
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* to access the service. Therefore granting access to a service
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* principal implicitly grants access to the credential necessary to
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* establish a security context with the service principal. This
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* applies regardless of whether the credentials are in a cache
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* or acquired via an exchange with the KDC. The credential can
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* be either a ticket granting ticket, a service ticket or a secret
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* key from a key table.
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* <p>
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* A ServicePermission contains a service principal name and
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* a list of actions which specify the context the credential can be
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* used within.
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* <p>
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* The service principal name is the canonical name of the
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* <code>KereberosPrincipal</code> supplying the service, that is
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* the KerberosPrincipal represents a Kerberos service
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* principal. This name is treated in a case sensitive manner.
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* An asterisk may appear by itself, to signify any service principal.
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* <p>
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* Granting this permission implies that the caller can use a cached
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* credential (TGT, service ticket or secret key) within the context
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* designated by the action. In the case of the TGT, granting this
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* permission also implies that the TGT can be obtained by an
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* Authentication Service exchange.
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* <p>
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* The possible actions are:
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* <p>
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* <pre>
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* initiate - allow the caller to use the credential to
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* initiate a security context with a service
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* principal.
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*
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* accept - allow the caller to use the credential to
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* accept security context as a particular
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* principal.
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* </pre>
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*
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* For example, to specify the permission to access to the TGT to
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* initiate a security context the permission is constructed as follows:
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* <p>
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* <pre>
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* ServicePermission("krbtgt/EXAMPLE.COM@EXAMPLE.COM", "initiate");
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* </pre>
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* <p>
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* To obtain a service ticket to initiate a context with the "host"
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* service the permission is constructed as follows:
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* <pre>
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* ServicePermission("host/foo.example.com@EXAMPLE.COM", "initiate");
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* </pre>
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* <p>
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* For a Kerberized server the action is "accept". For example, the permission
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* necessary to access and use the secret key of the Kerberized "host"
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* service (telnet and the likes) would be constructed as follows:
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* <p>
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* <pre>
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* ServicePermission("host/foo.example.com@EXAMPLE.COM", "accept");
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* </pre>
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*
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* @since 1.4
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*/
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public final class ServicePermission extends Permission
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implements java.io.Serializable {
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private static final long serialVersionUID = -1227585031618624935L;
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/**
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* Initiate a security context to the specified service
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*/
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private final static int INITIATE = 0x1;
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/**
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* Accept a security context
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*/
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private final static int ACCEPT = 0x2;
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/**
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* All actions
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*/
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private final static int ALL = INITIATE|ACCEPT;
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/**
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* No actions.
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*/
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private final static int NONE = 0x0;
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// the actions mask
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private transient int mask;
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/**
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* the actions string.
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*
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* @serial
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*/
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private String actions; // Left null as long as possible, then
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// created and re-used in the getAction function.
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/**
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* Create a new <code>ServicePermission</code>
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* with the specified <code>servicePrincipal</code>
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* and <code>action</code>.
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*
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* @param servicePrincipal the name of the service principal.
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* An asterisk may appear by itself, to signify any service principal.
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* <p>
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* @param action the action string
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*/
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public ServicePermission(String servicePrincipal, String action) {
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super(servicePrincipal);
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init(servicePrincipal, getMask(action));
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}
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/**
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* Initialize the ServicePermission object.
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*/
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private void init(String servicePrincipal, int mask) {
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if (servicePrincipal == null)
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throw new NullPointerException("service principal can't be null");
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if ((mask & ALL) != mask)
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throw new IllegalArgumentException("invalid actions mask");
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this.mask = mask;
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}
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/**
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* Checks if this Kerberos service permission object "implies" the
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* specified permission.
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* <P>
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* If none of the above are true, <code>implies</code> returns false.
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* @param p the permission to check against.
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*
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* @return true if the specified permission is implied by this object,
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* false if not.
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*/
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public boolean implies(Permission p) {
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if (!(p instanceof ServicePermission))
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return false;
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ServicePermission that = (ServicePermission) p;
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return ((this.mask & that.mask) == that.mask) &&
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impliesIgnoreMask(that);
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}
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boolean impliesIgnoreMask(ServicePermission p) {
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return ((this.getName().equals("*")) ||
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this.getName().equals(p.getName()));
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}
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/**
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* Checks two ServicePermission objects for equality.
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* <P>
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* @param obj the object to test for equality with this object.
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*
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* @return true if <i>obj</i> is a ServicePermission, and has the
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* same service principal, and actions as this
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* ServicePermission object.
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*/
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public boolean equals(Object obj) {
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if (obj == this)
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return true;
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if (! (obj instanceof ServicePermission))
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return false;
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ServicePermission that = (ServicePermission) obj;
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return ((this.mask & that.mask) == that.mask) &&
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this.getName().equals(that.getName());
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}
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/**
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* Returns the hash code value for this object.
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*
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* @return a hash code value for this object.
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*/
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public int hashCode() {
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return (getName().hashCode() ^ mask);
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}
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/**
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* Returns the "canonical string representation" of the actions in the
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* specified mask.
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* Always returns present actions in the following order:
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* initiate, accept.
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*
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* @param mask a specific integer action mask to translate into a string
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* @return the canonical string representation of the actions
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*/
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private static String getActions(int mask)
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{
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StringBuilder sb = new StringBuilder();
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boolean comma = false;
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if ((mask & INITIATE) == INITIATE) {
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if (comma) sb.append(',');
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else comma = true;
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sb.append("initiate");
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}
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if ((mask & ACCEPT) == ACCEPT) {
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if (comma) sb.append(',');
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else comma = true;
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sb.append("accept");
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}
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return sb.toString();
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}
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/**
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* Returns the canonical string representation of the actions.
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* Always returns present actions in the following order:
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* initiate, accept.
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*/
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public String getActions() {
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if (actions == null)
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actions = getActions(this.mask);
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return actions;
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}
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/**
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* Returns a PermissionCollection object for storing
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* ServicePermission objects.
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* <br>
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* ServicePermission objects must be stored in a manner that
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* allows them to be inserted into the collection in any order, but
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* that also enables the PermissionCollection implies method to
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* be implemented in an efficient (and consistent) manner.
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*
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* @return a new PermissionCollection object suitable for storing
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* ServicePermissions.
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*/
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public PermissionCollection newPermissionCollection() {
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return new KrbServicePermissionCollection();
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}
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/**
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* Return the current action mask.
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*
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* @return the actions mask.
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*/
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int getMask() {
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return mask;
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}
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/**
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* Convert an action string to an integer actions mask.
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*
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* @param action the action string
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* @return the action mask
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*/
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private static int getMask(String action) {
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if (action == null) {
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throw new NullPointerException("action can't be null");
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}
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if (action.equals("")) {
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throw new IllegalArgumentException("action can't be empty");
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}
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int mask = NONE;
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char[] a = action.toCharArray();
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int i = a.length - 1;
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if (i < 0)
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return mask;
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while (i != -1) {
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char c;
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// skip whitespace
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while ((i!=-1) && ((c = a[i]) == ' ' ||
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c == '\r' ||
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c == '\n' ||
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c == '\f' ||
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c == '\t'))
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i--;
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// check for the known strings
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int matchlen;
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if (i >= 7 && (a[i-7] == 'i' || a[i-7] == 'I') &&
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(a[i-6] == 'n' || a[i-6] == 'N') &&
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(a[i-5] == 'i' || a[i-5] == 'I') &&
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(a[i-4] == 't' || a[i-4] == 'T') &&
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(a[i-3] == 'i' || a[i-3] == 'I') &&
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(a[i-2] == 'a' || a[i-2] == 'A') &&
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(a[i-1] == 't' || a[i-1] == 'T') &&
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(a[i] == 'e' || a[i] == 'E'))
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{
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matchlen = 8;
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mask |= INITIATE;
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} else if (i >= 5 && (a[i-5] == 'a' || a[i-5] == 'A') &&
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(a[i-4] == 'c' || a[i-4] == 'C') &&
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(a[i-3] == 'c' || a[i-3] == 'C') &&
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(a[i-2] == 'e' || a[i-2] == 'E') &&
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(a[i-1] == 'p' || a[i-1] == 'P') &&
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(a[i] == 't' || a[i] == 'T'))
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{
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matchlen = 6;
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mask |= ACCEPT;
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} else {
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// parse error
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throw new IllegalArgumentException(
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"invalid permission: " + action);
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}
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// make sure we didn't just match the tail of a word
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// like "ackbarfaccept". Also, skip to the comma.
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boolean seencomma = false;
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while (i >= matchlen && !seencomma) {
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switch(a[i-matchlen]) {
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case ',':
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seencomma = true;
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/*FALLTHROUGH*/
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case ' ': case '\r': case '\n':
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case '\f': case '\t':
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break;
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default:
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throw new IllegalArgumentException(
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"invalid permission: " + action);
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}
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i--;
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}
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// point i at the location of the comma minus one (or -1).
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i -= matchlen;
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}
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return mask;
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}
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/**
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* WriteObject is called to save the state of the ServicePermission
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* to a stream. The actions are serialized, and the superclass
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* takes care of the name.
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*/
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private void writeObject(java.io.ObjectOutputStream s)
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throws IOException
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{
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// Write out the actions. The superclass takes care of the name
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// call getActions to make sure actions field is initialized
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if (actions == null)
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getActions();
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s.defaultWriteObject();
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}
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/**
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* readObject is called to restore the state of the
|
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* ServicePermission from a stream.
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409 |
*/
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410 |
private void readObject(java.io.ObjectInputStream s)
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throws IOException, ClassNotFoundException
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|
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{
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// Read in the action, then initialize the rest
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s.defaultReadObject();
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init(getName(),getMask(actions));
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}
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|
417 |
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|
|
419 |
/*
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|
420 |
public static void main(String args[]) throws Exception {
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|
421 |
ServicePermission this_ =
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422 |
new ServicePermission(args[0], "accept");
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423 |
ServicePermission that_ =
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new ServicePermission(args[1], "accept,initiate");
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425 |
System.out.println("-----\n");
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System.out.println("this.implies(that) = " + this_.implies(that_));
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|
427 |
System.out.println("-----\n");
|
|
428 |
System.out.println("this = "+this_);
|
|
429 |
System.out.println("-----\n");
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|
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System.out.println("that = "+that_);
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|
431 |
System.out.println("-----\n");
|
|
432 |
|
|
433 |
KrbServicePermissionCollection nps =
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434 |
new KrbServicePermissionCollection();
|
|
435 |
nps.add(this_);
|
|
436 |
nps.add(new ServicePermission("nfs/example.com@EXAMPLE.COM",
|
|
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"accept"));
|
|
438 |
nps.add(new ServicePermission("host/example.com@EXAMPLE.COM",
|
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"initiate"));
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440 |
System.out.println("nps.implies(that) = " + nps.implies(that_));
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441 |
System.out.println("-----\n");
|
|
442 |
|
|
443 |
Enumeration e = nps.elements();
|
|
444 |
|
|
445 |
while (e.hasMoreElements()) {
|
|
446 |
ServicePermission x =
|
|
447 |
(ServicePermission) e.nextElement();
|
|
448 |
System.out.println("nps.e = " + x);
|
|
449 |
}
|
|
450 |
|
|
451 |
}
|
|
452 |
*/
|
|
453 |
|
|
454 |
}
|
|
455 |
|
|
456 |
|
|
457 |
final class KrbServicePermissionCollection extends PermissionCollection
|
|
458 |
implements java.io.Serializable {
|
|
459 |
|
|
460 |
// Not serialized; see serialization section at end of class
|
|
461 |
private transient List<Permission> perms;
|
|
462 |
|
|
463 |
public KrbServicePermissionCollection() {
|
|
464 |
perms = new ArrayList<Permission>();
|
|
465 |
}
|
|
466 |
|
|
467 |
/**
|
|
468 |
* Check and see if this collection of permissions implies the permissions
|
|
469 |
* expressed in "permission".
|
|
470 |
*
|
|
471 |
* @param p the Permission object to compare
|
|
472 |
*
|
|
473 |
* @return true if "permission" is a proper subset of a permission in
|
|
474 |
* the collection, false if not.
|
|
475 |
*/
|
|
476 |
|
|
477 |
public boolean implies(Permission permission) {
|
|
478 |
if (! (permission instanceof ServicePermission))
|
|
479 |
return false;
|
|
480 |
|
|
481 |
ServicePermission np = (ServicePermission) permission;
|
|
482 |
int desired = np.getMask();
|
|
483 |
int effective = 0;
|
|
484 |
int needed = desired;
|
|
485 |
|
|
486 |
synchronized (this) {
|
|
487 |
int len = perms.size();
|
|
488 |
|
|
489 |
// need to deal with the case where the needed permission has
|
|
490 |
// more than one action and the collection has individual permissions
|
|
491 |
// that sum up to the needed.
|
|
492 |
|
|
493 |
for (int i = 0; i < len; i++) {
|
|
494 |
ServicePermission x = (ServicePermission) perms.get(i);
|
|
495 |
|
|
496 |
//System.out.println(" trying "+x);
|
|
497 |
if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(np)) {
|
|
498 |
effective |= x.getMask();
|
|
499 |
if ((effective & desired) == desired)
|
|
500 |
return true;
|
|
501 |
needed = (desired ^ effective);
|
|
502 |
}
|
|
503 |
}
|
|
504 |
}
|
|
505 |
return false;
|
|
506 |
}
|
|
507 |
|
|
508 |
/**
|
|
509 |
* Adds a permission to the ServicePermissions. The key for
|
|
510 |
* the hash is the name.
|
|
511 |
*
|
|
512 |
* @param permission the Permission object to add.
|
|
513 |
*
|
|
514 |
* @exception IllegalArgumentException - if the permission is not a
|
|
515 |
* ServicePermission
|
|
516 |
*
|
|
517 |
* @exception SecurityException - if this PermissionCollection object
|
|
518 |
* has been marked readonly
|
|
519 |
*/
|
|
520 |
|
|
521 |
public void add(Permission permission) {
|
|
522 |
if (! (permission instanceof ServicePermission))
|
|
523 |
throw new IllegalArgumentException("invalid permission: "+
|
|
524 |
permission);
|
|
525 |
if (isReadOnly())
|
|
526 |
throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");
|
|
527 |
|
|
528 |
synchronized (this) {
|
|
529 |
perms.add(0, permission);
|
|
530 |
}
|
|
531 |
}
|
|
532 |
|
|
533 |
/**
|
|
534 |
* Returns an enumeration of all the ServicePermission objects
|
|
535 |
* in the container.
|
|
536 |
*
|
|
537 |
* @return an enumeration of all the ServicePermission objects.
|
|
538 |
*/
|
|
539 |
|
|
540 |
public Enumeration<Permission> elements() {
|
|
541 |
// Convert Iterator into Enumeration
|
|
542 |
synchronized (this) {
|
|
543 |
return Collections.enumeration(perms);
|
|
544 |
}
|
|
545 |
}
|
|
546 |
|
|
547 |
private static final long serialVersionUID = -4118834211490102011L;
|
|
548 |
|
|
549 |
// Need to maintain serialization interoperability with earlier releases,
|
|
550 |
// which had the serializable field:
|
|
551 |
// private Vector permissions;
|
|
552 |
|
|
553 |
/**
|
|
554 |
* @serialField permissions java.util.Vector
|
|
555 |
* A list of ServicePermission objects.
|
|
556 |
*/
|
|
557 |
private static final ObjectStreamField[] serialPersistentFields = {
|
|
558 |
new ObjectStreamField("permissions", Vector.class),
|
|
559 |
};
|
|
560 |
|
|
561 |
/**
|
|
562 |
* @serialData "permissions" field (a Vector containing the ServicePermissions).
|
|
563 |
*/
|
|
564 |
/*
|
|
565 |
* Writes the contents of the perms field out as a Vector for
|
|
566 |
* serialization compatibility with earlier releases.
|
|
567 |
*/
|
|
568 |
private void writeObject(ObjectOutputStream out) throws IOException {
|
|
569 |
// Don't call out.defaultWriteObject()
|
|
570 |
|
|
571 |
// Write out Vector
|
|
572 |
Vector<Permission> permissions = new Vector<Permission>(perms.size());
|
|
573 |
|
|
574 |
synchronized (this) {
|
|
575 |
permissions.addAll(perms);
|
|
576 |
}
|
|
577 |
|
|
578 |
ObjectOutputStream.PutField pfields = out.putFields();
|
|
579 |
pfields.put("permissions", permissions);
|
|
580 |
out.writeFields();
|
|
581 |
}
|
|
582 |
|
|
583 |
/*
|
|
584 |
* Reads in a Vector of ServicePermissions and saves them in the perms field.
|
|
585 |
*/
|
|
586 |
private void readObject(ObjectInputStream in) throws IOException,
|
|
587 |
ClassNotFoundException {
|
|
588 |
// Don't call defaultReadObject()
|
|
589 |
|
|
590 |
// Read in serialized fields
|
|
591 |
ObjectInputStream.GetField gfields = in.readFields();
|
|
592 |
|
|
593 |
// Get the one we want
|
|
594 |
Vector<Permission> permissions =
|
|
595 |
(Vector<Permission>)gfields.get("permissions", null);
|
|
596 |
perms = new ArrayList<Permission>(permissions.size());
|
|
597 |
perms.addAll(permissions);
|
|
598 |
}
|
|
599 |
}
|