SmtpLoginAuthenticationModule.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / SmtpLoginAuthenticationModule.cs / 2 / 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;
 
#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)
        { 
            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.ASCII.GetBytes(userName)), false);
                    }
                    else 
                    {
                        this.sessions.Remove(sessionCookie); 
 
                        //
                        return new Authorization(Convert.ToBase64String(System.Text.Encoding.ASCII.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
    } 
}

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