001/* SaslServerFactory.java 002 Copyright (C) 2003, 2005, Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.security.sasl; 040 041import java.util.Map; 042 043import javax.security.auth.callback.CallbackHandler; 044 045/** 046 * <p>An interface for creating instances of {@link SaslServer}. A class that 047 * implements this interface must be thread-safe and handle multiple 048 * simultaneous requests. It must also have a public constructor that accepts 049 * no arguments.</p> 050 * 051 * <p>This interface is not normally accessed directly by a server, which will 052 * use the {@link Sasl} static methods to create a {@link SaslServer} instance 053 * instead. However, a particular environment may provide and install a new or 054 * different <code>SaslServerFactory</code>.</p> 055 * 056 * @see SaslServer 057 * @see Sasl 058 * 059 * @since 1.5 060 */ 061public interface SaslServerFactory 062{ 063 064 /** 065 * Creates a {@link SaslServer} instance using the parameters supplied. It 066 * returns <code>null</code> if no {@link SaslServer} instance can be created 067 * using the parameters supplied. Throws {@link SaslException} if it cannot 068 * create a {@link SaslServer} because of an error. 069 * 070 * @param mechanism the non-null IANA-registered name of a SASL mechanism 071 * (e.g. "GSSAPI", "CRAM-MD5"). 072 * @param protocol the non-null string name of the protocol for which the 073 * authentication is being performed (e.g. "ldap"). 074 * @param serverName the non-null fully qualified host name of the server to 075 * authenticate to. 076 * @param props the possibly null set of properties used to select the SASL 077 * mechanism and to configure the authentication exchange of the selected 078 * mechanism. See the {@link Sasl} class for a list of standard properties. 079 * Other, possibly mechanism-specific, properties can be included. Properties 080 * not relevant to the selected mechanism are ignored. 081 * @param cbh the possibly null callback handler to used by the SASL 082 * mechanisms to get further information from the application/library to 083 * complete the authentication. For example, a SASL mechanism might require 084 * the authentication ID, password and realm from the caller. The 085 * authentication ID is requested by using a 086 * {@link javax.security.auth.callback.NameCallback}. The password is 087 * requested by using a {@link javax.security.auth.callback.PasswordCallback}. 088 * The realm is requested by using a {@link RealmChoiceCallback} if there is 089 * a list of realms to choose from, and by using a {@link RealmCallback} if 090 * the realm must be entered. 091 * @return a possibly null {@link SaslServer} created using the parameters 092 * supplied. If <code>null</code> is returned, it means that this factory 093 * cannot produce a {@link SaslServer} using the parameters supplied. 094 * @throws SaslException if a SaslServer instance cannot be created because 095 * of an error. 096 */ 097 SaslServer createSaslServer(String mechanism, String protocol, 098 String serverName, Map<String, ?> props, 099 CallbackHandler cbh) 100 throws SaslException; 101 102 /** 103 * Returns an array of names of mechanisms that match the specified mechanism 104 * selection policies. 105 * 106 * @param props the possibly <code>null</code> set of properties used to 107 * specify the security policy of the SASL mechanisms. For example, if props 108 * contains the {@link Sasl#POLICY_NOPLAINTEXT} property with the value 109 * <code>"true"</code>, then the factory must not return any SASL mechanisms 110 * that are susceptible to simple plain passive attacks. See the {@link Sasl} 111 * class for a complete list of policy properties. Non-policy related 112 * properties, if present in props, are ignored. 113 * @return a non-null array containing IANA-registered SASL mechanism names. 114 */ 115 String[] getMechanismNames(Map<String, ?> props); 116}