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//
// Abstract Authentication implementation
//
// Authors:
// Greg Reinacker (gregr@rassoc.com)
// Sebastien Pouliot (spouliot@motus.com)
//
// Copyright 2002-2003 Greg Reinacker, Reinacker & Associates, Inc. All rights reserved.
// Portions (C) 2003 Motus Technologies Inc. (http://www.motus.com)
//
// Based on "DigestAuthenticationModule.cs". Original source code available at
// http://www.rassoc.com/gregr/weblog/stories/2002/07/09/webServicesSecurityHttpDigestAuthenticationWithoutActiveDirectory.html
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Configuration;
using System.Web;
namespace Mono.Http.Modules
{
abstract public class AuthenticationModule : IHttpModule
{
string authMethod;
public AuthenticationModule (string authenticationMethod)
{
authMethod = authenticationMethod;
}
public string AuthenticationMethod {
get { return authMethod; }
}
#region IHttpModule Members
public virtual void Init (HttpApplication context)
{
context.AuthenticateRequest += new EventHandler (this.OnAuthenticateRequest);
context.EndRequest += new EventHandler (this.OnEndRequest);
}
public virtual void Dispose () {}
#endregion
#region Event Handlers
public virtual void OnAuthenticateRequest (object source, EventArgs eventArgs)
{
if (!AuthenticationRequired)
return;
HttpApplication app = (HttpApplication) source;
string authdata = Authorization (app, AuthenticationMethod);
if ((authdata == null) || (!AcceptCredentials (app, authdata))) {
DenyAccess (app);
return;
}
}
abstract public void OnEndRequest (object source, EventArgs eventArgs);
#endregion
abstract protected bool AcceptCredentials (HttpApplication app, string authentication);
protected bool AuthenticationRequired {
get { return (AuthenticationMethod == ConfigurationSettings.AppSettings ["Authentication"]); }
}
protected void DenyAccess (HttpApplication app)
{
app.Response.StatusCode = 401;
app.Response.StatusDescription = "Access Denied";
// Write to response stream as well, to give user visual
// indication of error during development
app.Response.Write ("401 Access Denied");
app.CompleteRequest ();
}
protected string Authorization (HttpApplication app, string authenticationMethod)
{
string autz = app.Request.Headers ["Authorization"];
if ((autz == null) || (autz.Length == 0)) {
// No credentials; anonymous request
return null;
}
if (autz.ToUpper ().StartsWith (authenticationMethod.ToUpper ())) {
return autz.Substring (authenticationMethod.Length + 1);
}
return null;
}
}
}
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