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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
using System;
using System.Collections;
using System.Configuration;
using System.Text;
using Apache.Qpid.Sasl;
using Apache.Qpid.Sasl.Mechanisms;
using Apache.Qpid.Client.Configuration;
namespace Apache.Qpid.Client.Security
{
/// <summary>
/// Helper class to map SASL mechanisms to our
/// internal ISaslCallbackHandler implementations.
/// </summary>
/// <remarks>
/// The set of configured callback handlers and their order
/// controls the selection of the SASL mechanism used for authentication.
/// <para>
/// You can either replace the default handler for CRAM-MD5 and PLAIN
/// authentication (the two default options) using the application
/// configuration file. Configuration is done by especifying the SASL
/// mechanism name (e.g PLAIN) and the type implementing the callback handler
/// used to provide any data required by the mechanism like username and password.
/// </para>
/// <para>
/// Callback handler types should implement the IAMQCallbackHandler interface.
/// </para>
/// <para>
/// New callbacks or authentication mechanisms can be configured like this:
/// </para>
/// <example><![CDATA[
/// <configuration>
/// <configSections>
/// <sectionGroup name="qpid.client">
/// <section name="authentication" type="Apache.Qpid.Client.Configuration.AuthenticationConfigurationSectionHandler, Apache.Qpid.Client"/>
/// </sectionGroup>
/// </configSections>
/// <qpid.client>
/// <authentication>
/// <add key="TEST" value="Apache.Qpid.Client.Tests.Security.TestCallbackHandler, Apache.Qpid.Client.Tests"/>
/// </authentication>
/// </qpid.client>
/// </configuration>
/// ]]></example>
/// </remarks>
public sealed class CallbackHandlerRegistry
{
private static CallbackHandlerRegistry _instance =
new CallbackHandlerRegistry();
private OrderedHashTable _mechanism2HandlerMap;
private string[] _mechanisms;
public static CallbackHandlerRegistry Instance
{
get { return _instance; }
}
public string[] Mechanisms
{
get { return _mechanisms; }
}
private CallbackHandlerRegistry()
{
_mechanism2HandlerMap = (OrderedHashTable)
ConfigurationSettings.GetConfig("qpid.client/authentication");
// configure default options if not available
if ( _mechanism2HandlerMap == null )
_mechanism2HandlerMap = new OrderedHashTable();
if ( !_mechanism2HandlerMap.Contains(ExternalSaslClient.Mechanism) )
_mechanism2HandlerMap.Add(ExternalSaslClient.Mechanism, typeof(UsernamePasswordCallbackHandler));
if ( !_mechanism2HandlerMap.Contains(CramMD5SaslClient.Mechanism) )
_mechanism2HandlerMap.Add(CramMD5SaslClient.Mechanism, typeof(UsernamePasswordCallbackHandler));
if ( !_mechanism2HandlerMap.Contains(CramMD5HexSaslClient.Mechanism) )
_mechanism2HandlerMap.Add(CramMD5HexSaslClient.Mechanism, typeof(UsernamePasswordCallbackHandler));
if ( !_mechanism2HandlerMap.Contains(PlainSaslClient.Mechanism) )
_mechanism2HandlerMap.Add(PlainSaslClient.Mechanism, typeof(UsernamePasswordCallbackHandler));
_mechanisms = new string[_mechanism2HandlerMap.Count];
_mechanism2HandlerMap.OrderedKeys.CopyTo(_mechanisms, 0);
}
public bool IsSupportedMechanism(string mechanism)
{
return _mechanism2HandlerMap.Contains(mechanism);
}
public string ChooseMechanism(string mechanisms)
{
IList mechs = mechanisms.Split(' ');
foreach ( string supportedMech in _mechanisms )
{
if ( mechs.Contains(supportedMech) )
return supportedMech;
}
return null;
}
public Type GetCallbackHandler(string mechanism)
{
return (Type)_mechanism2HandlerMap[mechanism];
}
}
}
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