| author | weijun |
| Fri, 28 Apr 2017 06:45:21 +0800 | |
| changeset 44850 | 8ff7d16ab3f6 |
| parent 29820 | 7a3f0268f55b |
| child 45665 | 6f21cd7ec80e |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
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<html> |
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<head> |
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<!-- |
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44850
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8179369: src/java.security.jgss/share/classes/org/ietf/jgss/package.html should be HTML5-friendly
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Copyright (c) 2000, 2017, 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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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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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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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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327690766109
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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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</head> |
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<body bgcolor="white"> |
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This package presents a framework that allows application developers to |
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make use of security services like authentication, data integrity and |
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data confidentiality from a variety of underlying security mechanisms |
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like Kerberos, using a unified API. The security mechanisms that an |
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application can |
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chose to use are identified with unique object identifiers. One example |
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of such a mechanism is the Kerberos v5 GSS-API mechanism (object |
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identifier 1.2.840.113554.1.2.2). This mechanism is available through |
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the default instance of the GSSManager class.<p> |
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The GSS-API is defined in a language independent way in |
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<a href=http://www.ietf.org/rfc/rfc2743.txt>RFC 2743</a>. The Java |
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language bindings are defined in |
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<a href=http://www.ietf.org/rfc/rfc2853.txt>RFC 2853</a><p> |
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An application starts out by instantiating a <code>GSSManager</code> |
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which then serves as a factory for a security context. An application |
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can use specific principal names and credentials that are also created |
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using the GSSManager; or it can instantiate a |
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context with system defaults. It then goes through a context |
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establishment loop. Once a context is established with the |
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peer, authentication is complete. Data protection such as integrity |
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and confidentiality can then be obtained from this context.<p> |
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The GSS-API does not perform any communication with the peer. It merely |
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produces tokens that the application must somehow transport to the |
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other end. |
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8179369: src/java.security.jgss/share/classes/org/ietf/jgss/package.html should be HTML5-friendly
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<h3 id="useSubjectCredsOnly">Credential Acquisition</h3> |
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The GSS-API itself does not dictate how an underlying mechanism |
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obtains the credentials that are needed for authentication. It is |
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assumed that prior to calling the GSS-API, these credentials are |
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obtained and stored in a location that the mechanism provider is |
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aware of. However, the default model in the Java platform will be |
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that mechanism providers must obtain credentials only from the private |
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or public credential sets associated with the |
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{@link javax.security.auth.Subject Subject} in the
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current access control context. The Kerberos v5 |
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mechanism will search for the required INITIATE and ACCEPT credentials |
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({@link javax.security.auth.kerberos.KerberosTicket KerberosTicket} and
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{@link javax.security.auth.kerberos.KerberosKey KerberosKey}) in
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the private credential set where as some other mechanism might look |
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in the public set or in both. If the desired credential is not |
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present in the appropriate sets of the current Subject, the GSS-API |
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call must fail.<p> |
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This model has the advantage that credential management |
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is simple and predictable from the applications point of view. An |
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application, given the right permissions, can purge the credentials in |
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the Subject or renew them using standard Java API's. If it purged |
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the credentials, it would be sure that the JGSS mechanism would fail, |
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or if it renewed a time based credential it would be sure that a JGSS |
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mechanism would succeed.<p> |
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This model does require that a {@link
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javax.security.auth.login JAAS login} be performed in order to |
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authenticate and populate a Subject that the JGSS mechanism can later |
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utilize. However, applications have the ability to relax this |
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restriction by means of a system property: |
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<code>javax.security.auth.useSubjectCredsOnly</code>. By default |
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this system property will be assumed to be <code>true</code> (even when |
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it is unset) indicating that providers must only use the credentials |
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that are present in the current Subject. However, if this property is |
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explicitly set to false by the application, then it indicates that |
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the provider is free to use any credentials cache of its choice. Such |
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a credential cache might be a disk cache, an in-memory cache, or even |
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just the current Subject itself. |
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<h2>Related Documentation</h2> |
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<p> |
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For an online tutorial on using Java GSS-API, please see |
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<a href="../../../../technotes/guides/security/jgss/tutorials/index.html">Introduction to JAAS and Java GSS-API</a>. |
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</p> |
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<!-- |
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<h2>Package Specification</h2> |
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##### FILL IN ANY SPECS NEEDED BY JAVA COMPATIBILITY KIT ##### |
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<ul> |
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<li><a href="">##### REFER TO ANY FRAMEMAKER SPECIFICATION HERE #####</a> |
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</ul> |
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<h2>Related Documentation</h2> |
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For overviews, tutorials, examples, guides, and tool documentation, please see: |
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<ul> |
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<li><a href="">##### REFER TO NON-SPEC DOCUMENTATION HERE #####</a> |
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</ul> |
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--> |
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@since 1.4 |
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</body> |
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</html> |