author | avstepan |
Mon, 16 Mar 2015 19:09:13 +0400 | |
changeset 29492 | a4bf9a570035 |
parent 25859 | 3317bb8137f4 |
child 31080 | 00a25f4c4d44 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
29492
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* Copyright (c) 2000, 2015, 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} 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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* |
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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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* |
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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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* |
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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} |
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* with the specified {@code servicePrincipal} |
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* and {@code action}. |
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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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* |
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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} 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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* |
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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 {@code obj} 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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359 |
} |
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360 |
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361 |
// 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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364 |
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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368 |
break; |
2 | 369 |
case ' ': case '\r': case '\n': |
370 |
case '\f': case '\t': |
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371 |
break; |
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default: |
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373 |
throw new IllegalArgumentException( |
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"invalid permission: " + action); |
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375 |
} |
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376 |
i--; |
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377 |
} |
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378 |
||
379 |
// 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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382 |
||
383 |
return mask; |
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384 |
} |
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385 |
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386 |
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387 |
/** |
|
388 |
* WriteObject is called to save the state of the ServicePermission |
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389 |
* to a stream. The actions are serialized, and the superclass |
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390 |
* takes care of the name. |
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391 |
*/ |
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392 |
private void writeObject(java.io.ObjectOutputStream s) |
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throws IOException |
|
394 |
{ |
|
395 |
// Write out the actions. The superclass takes care of the name |
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396 |
// call getActions to make sure actions field is initialized |
|
397 |
if (actions == null) |
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398 |
getActions(); |
|
399 |
s.defaultWriteObject(); |
|
400 |
} |
|
401 |
||
402 |
/** |
|
403 |
* readObject is called to restore the state of the |
|
404 |
* ServicePermission from a stream. |
|
405 |
*/ |
|
406 |
private void readObject(java.io.ObjectInputStream s) |
|
407 |
throws IOException, ClassNotFoundException |
|
408 |
{ |
|
409 |
// Read in the action, then initialize the rest |
|
410 |
s.defaultReadObject(); |
|
411 |
init(getName(),getMask(actions)); |
|
412 |
} |
|
413 |
||
414 |
||
415 |
/* |
|
416 |
public static void main(String args[]) throws Exception { |
|
417 |
ServicePermission this_ = |
|
418 |
new ServicePermission(args[0], "accept"); |
|
419 |
ServicePermission that_ = |
|
420 |
new ServicePermission(args[1], "accept,initiate"); |
|
421 |
System.out.println("-----\n"); |
|
422 |
System.out.println("this.implies(that) = " + this_.implies(that_)); |
|
423 |
System.out.println("-----\n"); |
|
424 |
System.out.println("this = "+this_); |
|
425 |
System.out.println("-----\n"); |
|
426 |
System.out.println("that = "+that_); |
|
427 |
System.out.println("-----\n"); |
|
428 |
||
429 |
KrbServicePermissionCollection nps = |
|
430 |
new KrbServicePermissionCollection(); |
|
431 |
nps.add(this_); |
|
432 |
nps.add(new ServicePermission("nfs/example.com@EXAMPLE.COM", |
|
433 |
"accept")); |
|
434 |
nps.add(new ServicePermission("host/example.com@EXAMPLE.COM", |
|
435 |
"initiate")); |
|
436 |
System.out.println("nps.implies(that) = " + nps.implies(that_)); |
|
437 |
System.out.println("-----\n"); |
|
438 |
||
439 |
Enumeration e = nps.elements(); |
|
440 |
||
441 |
while (e.hasMoreElements()) { |
|
442 |
ServicePermission x = |
|
443 |
(ServicePermission) e.nextElement(); |
|
444 |
System.out.println("nps.e = " + x); |
|
445 |
} |
|
446 |
||
447 |
} |
|
448 |
*/ |
|
449 |
||
450 |
} |
|
451 |
||
452 |
||
453 |
final class KrbServicePermissionCollection extends PermissionCollection |
|
454 |
implements java.io.Serializable { |
|
455 |
||
456 |
// Not serialized; see serialization section at end of class |
|
457 |
private transient List<Permission> perms; |
|
458 |
||
459 |
public KrbServicePermissionCollection() { |
|
460 |
perms = new ArrayList<Permission>(); |
|
461 |
} |
|
462 |
||
463 |
/** |
|
464 |
* Check and see if this collection of permissions implies the permissions |
|
465 |
* expressed in "permission". |
|
466 |
* |
|
14014 | 467 |
* @param permission the Permission object to compare |
2 | 468 |
* |
469 |
* @return true if "permission" is a proper subset of a permission in |
|
470 |
* the collection, false if not. |
|
471 |
*/ |
|
472 |
public boolean implies(Permission permission) { |
|
473 |
if (! (permission instanceof ServicePermission)) |
|
474 |
return false; |
|
475 |
||
476 |
ServicePermission np = (ServicePermission) permission; |
|
477 |
int desired = np.getMask(); |
|
478 |
int effective = 0; |
|
479 |
int needed = desired; |
|
480 |
||
481 |
synchronized (this) { |
|
482 |
int len = perms.size(); |
|
483 |
||
484 |
// need to deal with the case where the needed permission has |
|
485 |
// more than one action and the collection has individual permissions |
|
486 |
// that sum up to the needed. |
|
487 |
||
488 |
for (int i = 0; i < len; i++) { |
|
489 |
ServicePermission x = (ServicePermission) perms.get(i); |
|
490 |
||
491 |
//System.out.println(" trying "+x); |
|
492 |
if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(np)) { |
|
493 |
effective |= x.getMask(); |
|
494 |
if ((effective & desired) == desired) |
|
495 |
return true; |
|
496 |
needed = (desired ^ effective); |
|
497 |
} |
|
498 |
} |
|
499 |
} |
|
500 |
return false; |
|
501 |
} |
|
502 |
||
503 |
/** |
|
504 |
* Adds a permission to the ServicePermissions. The key for |
|
505 |
* the hash is the name. |
|
506 |
* |
|
507 |
* @param permission the Permission object to add. |
|
508 |
* |
|
509 |
* @exception IllegalArgumentException - if the permission is not a |
|
510 |
* ServicePermission |
|
511 |
* |
|
512 |
* @exception SecurityException - if this PermissionCollection object |
|
513 |
* has been marked readonly |
|
514 |
*/ |
|
515 |
public void add(Permission permission) { |
|
516 |
if (! (permission instanceof ServicePermission)) |
|
517 |
throw new IllegalArgumentException("invalid permission: "+ |
|
518 |
permission); |
|
519 |
if (isReadOnly()) |
|
520 |
throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); |
|
521 |
||
522 |
synchronized (this) { |
|
523 |
perms.add(0, permission); |
|
524 |
} |
|
525 |
} |
|
526 |
||
527 |
/** |
|
528 |
* Returns an enumeration of all the ServicePermission objects |
|
529 |
* in the container. |
|
530 |
* |
|
531 |
* @return an enumeration of all the ServicePermission objects. |
|
532 |
*/ |
|
533 |
||
534 |
public Enumeration<Permission> elements() { |
|
535 |
// Convert Iterator into Enumeration |
|
536 |
synchronized (this) { |
|
537 |
return Collections.enumeration(perms); |
|
538 |
} |
|
539 |
} |
|
540 |
||
541 |
private static final long serialVersionUID = -4118834211490102011L; |
|
542 |
||
543 |
// Need to maintain serialization interoperability with earlier releases, |
|
544 |
// which had the serializable field: |
|
545 |
// private Vector permissions; |
|
546 |
||
547 |
/** |
|
548 |
* @serialField permissions java.util.Vector |
|
549 |
* A list of ServicePermission objects. |
|
550 |
*/ |
|
551 |
private static final ObjectStreamField[] serialPersistentFields = { |
|
552 |
new ObjectStreamField("permissions", Vector.class), |
|
553 |
}; |
|
554 |
||
555 |
/** |
|
556 |
* @serialData "permissions" field (a Vector containing the ServicePermissions). |
|
557 |
*/ |
|
558 |
/* |
|
559 |
* Writes the contents of the perms field out as a Vector for |
|
560 |
* serialization compatibility with earlier releases. |
|
561 |
*/ |
|
562 |
private void writeObject(ObjectOutputStream out) throws IOException { |
|
563 |
// Don't call out.defaultWriteObject() |
|
564 |
||
565 |
// Write out Vector |
|
7970
af1579474d16
7008728: diamond conversion of basic security, permissions, authentication
smarks
parents:
5506
diff
changeset
|
566 |
Vector<Permission> permissions = new Vector<>(perms.size()); |
2 | 567 |
|
568 |
synchronized (this) { |
|
569 |
permissions.addAll(perms); |
|
570 |
} |
|
571 |
||
572 |
ObjectOutputStream.PutField pfields = out.putFields(); |
|
573 |
pfields.put("permissions", permissions); |
|
574 |
out.writeFields(); |
|
575 |
} |
|
576 |
||
577 |
/* |
|
578 |
* Reads in a Vector of ServicePermissions and saves them in the perms field. |
|
579 |
*/ |
|
10709
d865c9f21240
7092375: Security Libraries don't build with javac -Werror
xuelei
parents:
9035
diff
changeset
|
580 |
@SuppressWarnings("unchecked") |
14014 | 581 |
private void readObject(ObjectInputStream in) |
582 |
throws IOException, ClassNotFoundException |
|
583 |
{ |
|
2 | 584 |
// Don't call defaultReadObject() |
585 |
||
586 |
// Read in serialized fields |
|
587 |
ObjectInputStream.GetField gfields = in.readFields(); |
|
588 |
||
589 |
// Get the one we want |
|
590 |
Vector<Permission> permissions = |
|
591 |
(Vector<Permission>)gfields.get("permissions", null); |
|
592 |
perms = new ArrayList<Permission>(permissions.size()); |
|
593 |
perms.addAll(permissions); |
|
594 |
} |
|
595 |
} |