1 /*
   2  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /**
  27  * This package contains utility classes related to the Kerberos network
  28  * authentication protocol. They do not provide much Kerberos support
  29  * themselves.<p>
  30  *
  31  * The Kerberos network authentication protocol is defined in
  32  * <a href=http://www.ietf.org/rfc/rfc4120.txt>RFC 4120</a>. The Java
  33  * platform contains support for the client side of Kerberos via the
  34  * {@link org.ietf.jgss} package. There might also be
  35  * a login module that implements
  36  * {@link javax.security.auth.spi.LoginModule LoginModule} to authenticate
  37  * Kerberos principals.<p>
  38  *
  39  * You can provide the name of your default realm and Key Distribution
  40  * Center (KDC) host for that realm using the system properties
  41  * {@code java.security.krb5.realm} and {@code java.security.krb5.kdc}.
  42  * Both properties must be set.
  43  * Alternatively, the {@code java.security.krb5.conf} system property can
  44  * be set to the location of an MIT style {@code krb5.conf} configuration
  45  * file. If none of these system properties are set, the {@code krb5.conf}
  46  * file is searched for in an implementation-specific manner. Typically,
  47  * an implementation will first look for a {@code krb5.conf} file in
  48  * {@code <java-home>/conf/security} and failing that, in an OS-specific
  49  * location.<p>
  50  *
  51  * The {@code krb5.conf} file is formatted in the Windows INI file style,
  52  * which contains a series of relations grouped into different sections.
  53  * Each relation contains a key and a value, the value can be an arbitrary
  54  * string or a boolean value. A boolean value can be one of "true", "false",
  55  * "yes", or "no", case-insensitive.<p>
  56  *
  57  * @since 1.4
  58  */
  59 package javax.security.auth.kerberos;