libjava/javax/security/sasl/SaslServerFactory.java

   1 /* SaslServerFactory.java
   2    Copyright (C) 2003, Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.security.sasl;
  40
  41 import java.util.Map;
  42
  43 import javax.security.auth.callback.CallbackHandler;
  44
  45 /**
  46  * <p>An interface for creating instances of {@link SaslServer}. A class that
  47  * implements this interface must be thread-safe and handle multiple
  48  * simultaneous requests. It must also have a public constructor that accepts
  49  * no arguments.</p>
  50  *
  51  * <p>This interface is not normally accessed directly by a server, which will
  52  * use the {@link Sasl} static methods to create a {@link SaslServer} instance
  53  * instead. However, a particular environment may provide and install a new or
  54  * different <code>SaslServerFactory</code>.</p>
  55  *
  56  * @see SaslServer
  57  * @see Sasl
  58  */
  59 public interface SaslServerFactory
  60 {
  61
  62   /**
  63    * Creates a {@link SaslServer} instance using the parameters supplied. It
  64    * returns <code>null</code> if no {@link SaslServer} instance can be created
  65    * using the parameters supplied. Throws {@link SaslException} if it cannot
  66    * create a {@link SaslServer} because of an error.
  67    *
  68    * @param mechanism the non-null IANA-registered name of a SASL mechanism
  69    * (e.g. "GSSAPI", "CRAM-MD5").
  70    * @param protocol the non-null string name of the protocol for which the
  71    * authentication is being performed (e.g. "ldap").
  72    * @param serverName the non-null fully qualified host name of the server to
  73    * authenticate to.
  74    * @param props the possibly null set of properties used to select the SASL
  75    * mechanism and to configure the authentication exchange of the selected
  76    * mechanism. See the {@link Sasl} class for a list of standard properties.
  77    * Other, possibly mechanism-specific, properties can be included. Properties
  78    * not relevant to the selected mechanism are ignored.
  79    * @param cbh the possibly null callback handler to used by the SASL
  80    * mechanisms to get further information from the application/library to
  81    * complete the authentication. For example, a SASL mechanism might require
  82    * the authentication ID, password and realm from the caller. The
  83    * authentication ID is requested by using a
  84    * {@link javax.security.auth.callback.NameCallback}. The password is
  85    * requested by using a {@link javax.security.auth.callback.PasswordCallback}.
  86    * The realm is requested by using a {@link RealmChoiceCallback} if there is
  87    * a list of realms to choose from, and by using a {@link RealmCallback} if
  88    * the realm must be entered.
  89    * @return a possibly null {@link SaslServer} created using the parameters
  90    * supplied. If <code>null</code> is returned, it means that this factory
  91    * cannot produce a {@link SaslServer} using the parameters supplied.
  92    * @throws SaslException if a SaslServer instance cannot be created because
  93    * of an error.
  94    */
  95   SaslServer createSaslServer(String mechanism, String protocol,
  96                               String serverName, Map props, CallbackHandler cbh)
  97     throws SaslException;
  98
  99   /**
 100    * Returns an array of names of mechanisms that match the specified mechanism
 101    * selection policies.
 102    *
 103    * @param props the possibly <code>null</code> set of properties used to
 104    * specify the security policy of the SASL mechanisms. For example, if props
 105    * contains the {@link Sasl#POLICY_NOPLAINTEXT} property with the value
 106    * <code>"true"</code>, then the factory must not return any SASL mechanisms
 107    * that are susceptible to simple plain passive attacks. See the {@link Sasl}
 108    * class for a complete list of policy properties. Non-policy related
 109    * properties, if present in props, are ignored.
 110    * @return a non-null array containing IANA-registered SASL mechanism names.
 111    */
 112   String[] getMechanismNames(Map props);
 113 }