SmtpLoginAuthenticationModule.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / SmtpLoginAuthenticationModule.cs / 1305376 / SmtpLoginAuthenticationModule.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.Mail 
{ 
    using System;
    using System.Collections; 
    using System.IO;
    using System.Net;
    using System.Security.Permissions;
    using System.Security.Authentication.ExtendedProtection; 

#if MAKE_MAILCLIENT_PUBLIC 
    internal 
#else
    internal 
#endif
        class SmtpLoginAuthenticationModule : ISmtpAuthenticationModule
    {
        Hashtable sessions = new Hashtable(); 

        internal SmtpLoginAuthenticationModule() 
        { 
        }
 
        #region ISmtpAuthenticationModule Members

        // Security this method will access NetworkCredential properties that demand UnmanagedCode and Environment Permission
        [EnvironmentPermission(SecurityAction.Assert, Unrestricted=true)] 
        [SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)]
        public Authorization Authenticate(string challenge, NetworkCredential credential, object sessionCookie, string spn, ChannelBinding channelBindingToken) 
        { 
            if(Logging.On)Logging.Enter(Logging.Web, this, "Authenticate", null);
            try { 
                lock (this.sessions)
                {
                    NetworkCredential cachedCredential = sessions[sessionCookie] as NetworkCredential;
                    if (cachedCredential == null) 
                    {
                        if (credential == null  || credential is SystemNetworkCredential) 
                        { 
                            return null;
                        } 

                        sessions[sessionCookie] = credential;

                        string userName = credential.UserName; 
                        string domain = credential.Domain;
 
                        if (domain!=null && domain.Length > 0) { 
                            userName = domain + "\\" + userName;
                        } 

                        //
                        return new Authorization(Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(userName)), false);
                    } 
                    else
                    { 
                        this.sessions.Remove(sessionCookie); 

                        // 
                        return new Authorization(Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(cachedCredential.Password)), true);
                    }
                }
            } finally { 
                if(Logging.On)Logging.Exit(Logging.Web, this, "Authenticate", null);
            } 
        } 

        public string AuthenticationType 
        {
            get
            {
                return "login"; 
            }
        } 
 
        public void CloseContext(object sessionCookie) {
            // This is a no-op since the context is not 
            // kept open by this module beyond auth completion.
        }

        #endregion 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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