472 lines
16 KiB
C#
472 lines
16 KiB
C#
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/***********************************************************************
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* File: NetCredential.cs
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* Author: Juan Carlos Luciani (jluciani@novell.com)
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*
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* Namespace: Novell.Security.ClientPasswordManager
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*
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* Classes implemented: NetCredential.
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*
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* Copyright (C) 2004 Novell, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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***********************************************************************/
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using System;
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using System.Net;
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using System.IO;
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using System.Diagnostics;
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using Novell.Security;
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using System.Reflection;
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namespace Novell.Security.ClientPasswordManager
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{
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/// <summary>
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/// Provides an implementation of ICredentials that leverages the
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/// services of the SecretStore Client Service Wallet.
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/// </summary>
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public class NetCredential: ICredentials
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{
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#region Class Members and Defines
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// This is temporary until we add code to interact with the SecretStore
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private class UserCache
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{
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public string m_userName;
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public CredentialCache m_credentialCache;
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public UserCache()
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{
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m_userName = null;
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m_credentialCache = null;
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}
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}
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// This is temporary until we add code to interact with the SecretStore
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private static UserCache[] m_userCaches = new UserCache[10];
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private string m_svcName = null;
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private string m_svcGroupName = null;
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private string m_userName = null;
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private string m_password = null;
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private string m_credScope = null;
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private bool m_haveCredentials;
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#endregion
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private static bool bMiCasaIsAvailable = false;
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private static Assembly assembly = null; //
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private static string MI_CASA_CLASS_NAME = "Novell.CASA.miCASA";
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static NetCredential()
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{
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try
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{
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assembly = Assembly.LoadWithPartialName("Novell.CASA.miCASAWrapper");
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if (assembly != null)
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bMiCasaIsAvailable = true;
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}
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catch (Exception e)
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{
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Dbg.trcError(e.ToString());
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}
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}
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/// <summary>
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/// Constructs a NetCredential object for Windows Applications.
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///
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/// There is a high probability that services under the same group share the
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/// same user name and passwords. By specifying a service group name, the caller wants to
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/// take advantage of this to try to improve the user experience. If the service group
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/// name is not specified then no effort is made to share usernames and passwords with
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/// other services.
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///
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/// If the svcGroupNameIsRealmName parameter is set to true then it is assumed that
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/// the services in the group validate username and passwords against the same
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/// database or against synchronized databases.
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///
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/// If the svcGroupNameIsRealmName parameter is set to false then an attempt will be
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/// made to share passwords between the services in the group but services will be
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/// allowed to use different passwords. Specifying a service group does not mean
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/// that the system will not be able to obtain a username and password that is
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/// unique to a particular service.
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/// </summary>
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/// <param name="svcName">Name of service requesting credentials.</param>
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/// <param name="svcGroupName">Name of group to which the service belongs, can be null or zero length.</param>
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/// <param name="svcGroupNameIsRealmName">The group name is the name of the backend authentication realm.</param>
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/// <param name="userName">Name of the user.</param>
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/// <param name="password">User password if known, otherwise null or empty string.</param>
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public NetCredential(string svcName,
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string svcGroupName,
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bool svcGroupNameIsRealmName,
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string userName,
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string password)
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{
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// Check input parameters
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if (svcName == null
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|| svcName.Length == 0
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|| (svcGroupNameIsRealmName
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&& (svcGroupName == null
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|| svcGroupName.Length == 0))
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|| userName == null
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|| userName.Length == 0)
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{
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Dbg.trcError("NetCredential constructor- Invalid input parameter");
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throw new Exception("NetCredential constructor- Invalid input parameter");
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}
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m_svcName = svcName;
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m_svcGroupName = svcGroupName;
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m_userName = userName;
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m_password = password;
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// Determine the name under which the credentials are scoped
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if (svcGroupNameIsRealmName)
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m_credScope = m_svcGroupName;
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else
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m_credScope = m_svcName;
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// Check if we need to update the credential cache
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if (password != null
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&& password.Length != 0)
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{
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if (bMiCasaIsAvailable)
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{
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UpdateMiCasaCredential(userName, password, m_svcName, svcGroupName);
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}
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else
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{
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UpdateCredentialCache(userName, password, m_credScope);
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}
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// Remember that there object has credentials associated with it to avoid
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// looking them up in the cache at a later time.
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m_haveCredentials = true;
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}
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else
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{
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// Indicate that we need to look up the credentials in the cache
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m_haveCredentials = false;
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}
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}
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/// <summary>
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/// Constructs a NetCredential object.
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///
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/// No effort is made to share usernames and passwords with other services.
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/// </summary>
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/// <param name="svcName">Name of service requesting credentials.</param>
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/// <param name="userName">Name of the user.</param>
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/// <param name="password">User password if known, otherwise null or empty string. Not meaningfull if username is not specified.</param>
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public NetCredential(string svcName,
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string userName,
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string password)
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{
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// Check input parameters
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if (svcName == null
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|| svcName.Length == 0
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|| userName == null
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|| userName.Length == 0)
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{
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Dbg.trcError("NetCredential constructor- Invalid input parameter");
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throw new Exception("NetCredential constructor- Invalid input parameter");
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}
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m_svcName = svcName;
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m_userName = userName;
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m_password = password;
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// The credentials are scoped to the service name
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m_credScope = m_svcName;
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// Check if we need to update the credential cache
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if (password != null
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&& password.Length != 0)
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{
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if (bMiCasaIsAvailable)
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{
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UpdateMiCasaCredential(userName, password, m_svcName, null);
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}
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else
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{
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UpdateCredentialCache(userName, password, m_credScope);
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}
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// Remember that there object has credentials associated with it to avoid
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// looking them up in the cache at a later time.
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m_haveCredentials = true;
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}
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else
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{
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// Indicate that we need to look up the credentials in the cache
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m_haveCredentials = false;
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}
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}
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/// <summary>
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/// Removes a NetworkCredential instance from the cache.
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/// </summary>
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/// <param name="uriPrefix">A Uri that specifies the URI prefix of the resources that the credential is used for.</param>
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/// <param name="authType">The authentication scheme used by the host named in <i>uriPrefix</i>. </param>
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public void Remove(Uri uriPrefix,
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String authType)
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{
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// Only process requests for the "Basic" authentication scheme
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if (authType.ToUpper() == "BASIC")
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{
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if (bMiCasaIsAvailable)
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{
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RemoveMiCasaCredential(uriPrefix.ToString());
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return;
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}
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// Check if we already have credentials
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if (m_haveCredentials)
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{
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// Clear the credentials.
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m_password = null;
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m_haveCredentials = false;
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}
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//
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// Lookup the credentials in the cache
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//
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// Synchronize access into the cache
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lock (m_userCaches)
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{
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// Look for the user's cache
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int i;
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for (i = 0; i < m_userCaches.Length; i++)
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{
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// Check if the user cache has been instantiated
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if (m_userCaches[i] != null)
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{
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if (m_userCaches[i].m_userName == m_userName)
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{
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// We found a cache for this user, remove the credentials.
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m_userCaches[i].m_credentialCache.Remove(new Uri("http://" + m_credScope, true), "Basic");
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break;
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}
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}
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}
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}
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}
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else
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{
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Dbg.trcError("NetCredential.GetCredential- Unsupported authentication scheme");
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}
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}
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/// <summary>
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/// Obtains the network credentials necessary to gain access to the resources associated
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/// with the specified uri prefix.
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/// </summary>
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/// <param name="uriPrefix">Uri that specifies the URI prefix of resources that the credential grant access to</param>
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/// <param name="authType">The authentication scheme used by the resource</param>
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/// <returns>NetworkCredential object or null if not successful</returns>
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public NetworkCredential GetCredential(Uri uriPrefix,
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String authType)
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{
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NetworkCredential cred = null;
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// Only process requests for the "Basic" authentication scheme
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if (authType.ToUpper() == "BASIC")
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{
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if (bMiCasaIsAvailable)
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{
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return GetMiCasaCredential(m_svcName, m_svcGroupName);
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}
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// Check if we already have credentials
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if (m_haveCredentials)
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{
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// Create NetworkCredential object with the credentials that we have.
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cred = new NetworkCredential(m_userName, m_password);
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}
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else
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{
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//
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// Lookup the credentials in the cache
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//
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// Synchronize access into the cache
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lock (m_userCaches)
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{
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// Look for the user's cache
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int i;
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for (i = 0; i < m_userCaches.Length; i++)
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{
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// Check if the user cache has been instantiated
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if (m_userCaches[i] != null)
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{
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if (m_userCaches[i].m_userName == m_userName)
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{
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// We found a cache for this user, check if we already have the
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// necessary credentials.
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cred = m_userCaches[i].m_credentialCache.GetCredential(new Uri("http://" + m_credScope, true), "Basic");
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break;
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}
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}
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}
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}
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}
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}
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else
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{
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Dbg.trcError("NetCredential.GetCredential- Unsuported authentication scheme");
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}
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return cred;
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}
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/// <summary>
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/// Updates the credential cache with the supplied credentials.
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/// </summary>
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/// <param name="userName">Name of the user.</param>
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/// <param name="password">User password.</param>
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/// <param name="credScope">Credential scope.</param>
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private void UpdateCredentialCache(string userName, string password, string credScope)
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{
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// Check if we already have a cache for the user
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lock (m_userCaches)
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{
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int i;
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for (i = 0; i < m_userCaches.Length; i++)
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{
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// Check if the user cache has been instantiated
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if (m_userCaches[i] != null)
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{
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if (m_userCaches[i].m_userName == userName)
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{
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// A user cache has already been instantiated, check if
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// we already have a cache entry.
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if (m_userCaches[i].m_credentialCache.GetCredential(new Uri("http://" + credScope, true), "Basic") != null)
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{
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// We have a cache entry, remove it.
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m_userCaches[i].m_credentialCache.Remove(new Uri("http://" + credScope, true), "Basic");
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}
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break;
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}
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}
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else
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{
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// Instantiate user cache and use it
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m_userCaches[i] = new UserCache();
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// Setup user cache
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m_userCaches[i].m_userName = userName;
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m_userCaches[i].m_credentialCache = new CredentialCache();
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break;
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}
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}
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// Exit if we failed to obtain a user cache
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if (i == m_userCaches.Length)
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return;
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// Create NetworkCredential object and add it to the credential cache
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NetworkCredential cred = new NetworkCredential(userName, password);
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m_userCaches[i].m_credentialCache.Add(new Uri("http://" + credScope, true), "Basic", cred);
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}
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}
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// the following is micasa/secretstore code.
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private void UpdateMiCasaCredential(string sUsername, string sPassword, string sSecretID, string sSharedID)
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{
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// call SetCredential through reflection
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Type type = assembly.GetType(MI_CASA_CLASS_NAME);
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object Instance = Activator.CreateInstance (type);
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object[] arguments = new object[4];
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arguments[0] = sSecretID;
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arguments[1] = sSharedID;
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arguments[2] = sUsername;
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arguments[3] = sPassword;
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object result;
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try
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{
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result = type.InvokeMember("SetBasicCredential", BindingFlags.InvokeMethod, null, Instance, arguments);
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}
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catch (Exception e)
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{
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Dbg.trcError(e.ToString());
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}
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}
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private NetworkCredential GetMiCasaCredential(string sSecretID, string sSharedID)
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{
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object oUsername;
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object oPassword;
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Type type = assembly.GetType(MI_CASA_CLASS_NAME);
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object Instance = Activator.CreateInstance (type);
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try
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{
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object[] arguments = new object[2];
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arguments[0] = sSecretID;
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arguments[1] = sSharedID;
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// reflection call
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oUsername = type.InvokeMember("GetCredentialUsername", BindingFlags.InvokeMethod, null, Instance, arguments);
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oPassword = type.InvokeMember("GetCredentialPassword", BindingFlags.InvokeMethod, null, Instance, arguments);
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if ((oUsername != null) & (oPassword != null))
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return new NetworkCredential(oUsername.ToString().Trim(), oPassword.ToString().Trim());
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// invoke the GetUsername and GetPassword methods
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//object username = basicCred.InvokeMember("GetUsername", BindingFlags.InvokeMethod, null, result, null);
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//object password = basicCred.InvokeMember("GetPassword", BindingFlags.InvokeMethod, null, result, null);
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}
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catch (Exception e)
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{
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Dbg.trcError(e.ToString());
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}
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return null;
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}
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private void RemoveMiCasaCredential(string sSecretID)
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{
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Type type = assembly.GetType(MI_CASA_CLASS_NAME);
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object Instance = Activator.CreateInstance (type);
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try
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{
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object[] arguments = new object[2];
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arguments[0] = sSecretID;
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arguments[1] = null;
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// reflection call
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type.InvokeMember("RemoveBasicCredential", BindingFlags.InvokeMethod, null, Instance, arguments);
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}
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catch (Exception e)
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{
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Dbg.trcError(e.ToString());
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}
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}
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}
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}
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