author | mullan |
Tue, 09 Jun 2015 09:18:07 -0400 | |
changeset 31080 | 00a25f4c4d44 |
parent 29492 | a4bf9a570035 |
child 31538 | 0981099a3e54 |
permissions | -rw-r--r-- |
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/* |
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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.io.IOException; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.ObjectStreamField; |
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import java.security.Permission; |
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import java.security.PermissionCollection; |
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import java.util.*; |
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import java.util.concurrent.ConcurrentHashMap; |
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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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* Creates a ServicePermission object with the specified servicePrincipal |
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* and a pre-calculated mask. Avoids the overhead of re-computing the mask. |
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* Called by ServicePermissionCollection. |
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*/ |
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ServicePermission(String servicePrincipal, int mask) { |
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super(servicePrincipal); |
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init(servicePrincipal, mask); |
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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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@Override |
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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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@Override |
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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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@Override |
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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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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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@Override |
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public String getActions() { |
276 |
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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@Override |
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public PermissionCollection newPermissionCollection() { |
297 |
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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308 |
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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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324 |
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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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||
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while (i != -1) { |
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char c; |
|
335 |
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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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343 |
||
344 |
// check for the known strings |
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int matchlen; |
|
346 |
||
347 |
if (i >= 7 && (a[i-7] == 'i' || a[i-7] == 'I') && |
|
348 |
(a[i-6] == 'n' || a[i-6] == 'N') && |
|
349 |
(a[i-5] == 'i' || a[i-5] == 'I') && |
|
350 |
(a[i-4] == 't' || a[i-4] == 'T') && |
|
351 |
(a[i-3] == 'i' || a[i-3] == 'I') && |
|
352 |
(a[i-2] == 'a' || a[i-2] == 'A') && |
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(a[i-1] == 't' || a[i-1] == 'T') && |
|
354 |
(a[i] == 'e' || a[i] == 'E')) |
|
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{ |
|
356 |
matchlen = 8; |
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mask |= INITIATE; |
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358 |
||
359 |
} else if (i >= 5 && (a[i-5] == 'a' || a[i-5] == 'A') && |
|
360 |
(a[i-4] == 'c' || a[i-4] == 'C') && |
|
361 |
(a[i-3] == 'c' || a[i-3] == 'C') && |
|
362 |
(a[i-2] == 'e' || a[i-2] == 'E') && |
|
363 |
(a[i-1] == 'p' || a[i-1] == 'P') && |
|
364 |
(a[i] == 't' || a[i] == 'T')) |
|
365 |
{ |
|
366 |
matchlen = 6; |
|
367 |
mask |= ACCEPT; |
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368 |
||
369 |
} else { |
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370 |
// parse error |
|
371 |
throw new IllegalArgumentException( |
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372 |
"invalid permission: " + action); |
|
373 |
} |
|
374 |
||
375 |
// make sure we didn't just match the tail of a word |
|
376 |
// like "ackbarfaccept". Also, skip to the comma. |
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377 |
boolean seencomma = false; |
|
378 |
while (i >= matchlen && !seencomma) { |
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379 |
switch(a[i-matchlen]) { |
|
380 |
case ',': |
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seencomma = true; |
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break; |
2 | 383 |
case ' ': case '\r': case '\n': |
384 |
case '\f': case '\t': |
|
385 |
break; |
|
386 |
default: |
|
387 |
throw new IllegalArgumentException( |
|
388 |
"invalid permission: " + action); |
|
389 |
} |
|
390 |
i--; |
|
391 |
} |
|
392 |
||
393 |
// point i at the location of the comma minus one (or -1). |
|
394 |
i -= matchlen; |
|
395 |
} |
|
396 |
||
397 |
return mask; |
|
398 |
} |
|
399 |
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400 |
||
401 |
/** |
|
402 |
* WriteObject is called to save the state of the ServicePermission |
|
403 |
* to a stream. The actions are serialized, and the superclass |
|
404 |
* takes care of the name. |
|
405 |
*/ |
|
406 |
private void writeObject(java.io.ObjectOutputStream s) |
|
407 |
throws IOException |
|
408 |
{ |
|
409 |
// Write out the actions. The superclass takes care of the name |
|
410 |
// call getActions to make sure actions field is initialized |
|
411 |
if (actions == null) |
|
412 |
getActions(); |
|
413 |
s.defaultWriteObject(); |
|
414 |
} |
|
415 |
||
416 |
/** |
|
417 |
* readObject is called to restore the state of the |
|
418 |
* ServicePermission from a stream. |
|
419 |
*/ |
|
420 |
private void readObject(java.io.ObjectInputStream s) |
|
421 |
throws IOException, ClassNotFoundException |
|
422 |
{ |
|
423 |
// Read in the action, then initialize the rest |
|
424 |
s.defaultReadObject(); |
|
425 |
init(getName(),getMask(actions)); |
|
426 |
} |
|
427 |
||
428 |
||
429 |
/* |
|
430 |
public static void main(String args[]) throws Exception { |
|
431 |
ServicePermission this_ = |
|
432 |
new ServicePermission(args[0], "accept"); |
|
433 |
ServicePermission that_ = |
|
434 |
new ServicePermission(args[1], "accept,initiate"); |
|
435 |
System.out.println("-----\n"); |
|
436 |
System.out.println("this.implies(that) = " + this_.implies(that_)); |
|
437 |
System.out.println("-----\n"); |
|
438 |
System.out.println("this = "+this_); |
|
439 |
System.out.println("-----\n"); |
|
440 |
System.out.println("that = "+that_); |
|
441 |
System.out.println("-----\n"); |
|
442 |
||
443 |
KrbServicePermissionCollection nps = |
|
444 |
new KrbServicePermissionCollection(); |
|
445 |
nps.add(this_); |
|
446 |
nps.add(new ServicePermission("nfs/example.com@EXAMPLE.COM", |
|
447 |
"accept")); |
|
448 |
nps.add(new ServicePermission("host/example.com@EXAMPLE.COM", |
|
449 |
"initiate")); |
|
450 |
System.out.println("nps.implies(that) = " + nps.implies(that_)); |
|
451 |
System.out.println("-----\n"); |
|
452 |
||
453 |
Enumeration e = nps.elements(); |
|
454 |
||
455 |
while (e.hasMoreElements()) { |
|
456 |
ServicePermission x = |
|
457 |
(ServicePermission) e.nextElement(); |
|
458 |
System.out.println("nps.e = " + x); |
|
459 |
} |
|
460 |
||
461 |
} |
|
462 |
*/ |
|
463 |
||
464 |
} |
|
465 |
||
466 |
||
467 |
final class KrbServicePermissionCollection extends PermissionCollection |
|
468 |
implements java.io.Serializable { |
|
469 |
||
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470 |
// Key is the service principal, value is the ServicePermission. |
2 | 471 |
// Not serialized; see serialization section at end of class |
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472 |
private transient ConcurrentHashMap<String, Permission> perms; |
2 | 473 |
|
474 |
public KrbServicePermissionCollection() { |
|
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|
475 |
perms = new ConcurrentHashMap<>(); |
2 | 476 |
} |
477 |
||
478 |
/** |
|
479 |
* Check and see if this collection of permissions implies the permissions |
|
480 |
* expressed in "permission". |
|
481 |
* |
|
14014 | 482 |
* @param permission the Permission object to compare |
2 | 483 |
* |
484 |
* @return true if "permission" is a proper subset of a permission in |
|
485 |
* the collection, false if not. |
|
486 |
*/ |
|
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|
487 |
@Override |
2 | 488 |
public boolean implies(Permission permission) { |
489 |
if (! (permission instanceof ServicePermission)) |
|
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|
490 |
return false; |
2 | 491 |
|
492 |
ServicePermission np = (ServicePermission) permission; |
|
493 |
int desired = np.getMask(); |
|
494 |
||
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|
495 |
// first, check for wildcard principal |
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|
496 |
ServicePermission x = (ServicePermission)perms.get("*"); |
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|
497 |
if (x != null) { |
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|
498 |
if ((x.getMask() & desired) == desired) { |
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|
499 |
return true; |
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|
500 |
} |
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|
501 |
} |
2 | 502 |
|
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|
503 |
// otherwise, check for match on principal |
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|
504 |
x = (ServicePermission)perms.get(np.getName()); |
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|
505 |
if (x != null) { |
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|
506 |
//System.out.println(" trying "+x); |
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|
507 |
if ((x.getMask() & desired) == desired) { |
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|
508 |
return true; |
2 | 509 |
} |
510 |
} |
|
511 |
return false; |
|
512 |
} |
|
513 |
||
514 |
/** |
|
515 |
* Adds a permission to the ServicePermissions. The key for |
|
516 |
* the hash is the name. |
|
517 |
* |
|
518 |
* @param permission the Permission object to add. |
|
519 |
* |
|
520 |
* @exception IllegalArgumentException - if the permission is not a |
|
521 |
* ServicePermission |
|
522 |
* |
|
523 |
* @exception SecurityException - if this PermissionCollection object |
|
524 |
* has been marked readonly |
|
525 |
*/ |
|
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changeset
|
526 |
@Override |
2 | 527 |
public void add(Permission permission) { |
528 |
if (! (permission instanceof ServicePermission)) |
|
529 |
throw new IllegalArgumentException("invalid permission: "+ |
|
530 |
permission); |
|
531 |
if (isReadOnly()) |
|
532 |
throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); |
|
533 |
||
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diff
changeset
|
534 |
ServicePermission sp = (ServicePermission)permission; |
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|
535 |
String princName = sp.getName(); |
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diff
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|
536 |
|
00a25f4c4d44
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diff
changeset
|
537 |
// Add permission to map if it is absent, or replace with new |
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diff
changeset
|
538 |
// permission if applicable. NOTE: cannot use lambda for |
00a25f4c4d44
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diff
changeset
|
539 |
// remappingFunction parameter until JDK-8076596 is fixed. |
00a25f4c4d44
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diff
changeset
|
540 |
perms.merge(princName, sp, |
00a25f4c4d44
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diff
changeset
|
541 |
new java.util.function.BiFunction<>() { |
00a25f4c4d44
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diff
changeset
|
542 |
@Override |
00a25f4c4d44
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diff
changeset
|
543 |
public Permission apply(Permission existingVal, |
00a25f4c4d44
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diff
changeset
|
544 |
Permission newVal) { |
00a25f4c4d44
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diff
changeset
|
545 |
int oldMask = ((ServicePermission)existingVal).getMask(); |
00a25f4c4d44
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diff
changeset
|
546 |
int newMask = ((ServicePermission)newVal).getMask(); |
00a25f4c4d44
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diff
changeset
|
547 |
if (oldMask != newMask) { |
00a25f4c4d44
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diff
changeset
|
548 |
int effective = oldMask | newMask; |
00a25f4c4d44
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diff
changeset
|
549 |
if (effective == newMask) { |
00a25f4c4d44
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diff
changeset
|
550 |
return newVal; |
00a25f4c4d44
8056179: Store permissions in concurrent collections in PermissionCollection subclasses
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29492
diff
changeset
|
551 |
} |
00a25f4c4d44
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parents:
29492
diff
changeset
|
552 |
if (effective != oldMask) { |
00a25f4c4d44
8056179: Store permissions in concurrent collections in PermissionCollection subclasses
mullan
parents:
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diff
changeset
|
553 |
return new ServicePermission(princName, effective); |
00a25f4c4d44
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mullan
parents:
29492
diff
changeset
|
554 |
} |
00a25f4c4d44
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mullan
parents:
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diff
changeset
|
555 |
} |
00a25f4c4d44
8056179: Store permissions in concurrent collections in PermissionCollection subclasses
mullan
parents:
29492
diff
changeset
|
556 |
return existingVal; |
00a25f4c4d44
8056179: Store permissions in concurrent collections in PermissionCollection subclasses
mullan
parents:
29492
diff
changeset
|
557 |
} |
00a25f4c4d44
8056179: Store permissions in concurrent collections in PermissionCollection subclasses
mullan
parents:
29492
diff
changeset
|
558 |
} |
00a25f4c4d44
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parents:
29492
diff
changeset
|
559 |
); |
2 | 560 |
} |
561 |
||
562 |
/** |
|
563 |
* Returns an enumeration of all the ServicePermission objects |
|
564 |
* in the container. |
|
565 |
* |
|
566 |
* @return an enumeration of all the ServicePermission objects. |
|
567 |
*/ |
|
31080
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parents:
29492
diff
changeset
|
568 |
@Override |
2 | 569 |
public Enumeration<Permission> elements() { |
31080
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parents:
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diff
changeset
|
570 |
return perms.elements(); |
2 | 571 |
} |
572 |
||
573 |
private static final long serialVersionUID = -4118834211490102011L; |
|
574 |
||
575 |
// Need to maintain serialization interoperability with earlier releases, |
|
576 |
// which had the serializable field: |
|
577 |
// private Vector permissions; |
|
578 |
||
579 |
/** |
|
580 |
* @serialField permissions java.util.Vector |
|
581 |
* A list of ServicePermission objects. |
|
582 |
*/ |
|
583 |
private static final ObjectStreamField[] serialPersistentFields = { |
|
584 |
new ObjectStreamField("permissions", Vector.class), |
|
585 |
}; |
|
586 |
||
587 |
/** |
|
588 |
* @serialData "permissions" field (a Vector containing the ServicePermissions). |
|
589 |
*/ |
|
590 |
/* |
|
591 |
* Writes the contents of the perms field out as a Vector for |
|
592 |
* serialization compatibility with earlier releases. |
|
593 |
*/ |
|
594 |
private void writeObject(ObjectOutputStream out) throws IOException { |
|
595 |
// Don't call out.defaultWriteObject() |
|
596 |
||
597 |
// Write out Vector |
|
31080
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diff
changeset
|
598 |
Vector<Permission> permissions = new Vector<>(perms.values()); |
2 | 599 |
|
600 |
ObjectOutputStream.PutField pfields = out.putFields(); |
|
601 |
pfields.put("permissions", permissions); |
|
602 |
out.writeFields(); |
|
603 |
} |
|
604 |
||
605 |
/* |
|
606 |
* Reads in a Vector of ServicePermissions and saves them in the perms field. |
|
607 |
*/ |
|
10709
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parents:
9035
diff
changeset
|
608 |
@SuppressWarnings("unchecked") |
14014 | 609 |
private void readObject(ObjectInputStream in) |
610 |
throws IOException, ClassNotFoundException |
|
611 |
{ |
|
2 | 612 |
// Don't call defaultReadObject() |
613 |
||
614 |
// Read in serialized fields |
|
615 |
ObjectInputStream.GetField gfields = in.readFields(); |
|
616 |
||
617 |
// Get the one we want |
|
618 |
Vector<Permission> permissions = |
|
619 |
(Vector<Permission>)gfields.get("permissions", null); |
|
31080
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diff
changeset
|
620 |
perms = new ConcurrentHashMap<>(permissions.size()); |
00a25f4c4d44
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parents:
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diff
changeset
|
621 |
for (Permission perm : permissions) { |
00a25f4c4d44
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parents:
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diff
changeset
|
622 |
perms.put(perm.getName(), perm); |
00a25f4c4d44
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diff
changeset
|
623 |
} |
2 | 624 |
} |
625 |
} |