class/Mono.Http/Mono.Http.Modules/BasicAuthenticationModule.cs

   1 //
   2 // Basic Authentication implementation
   3 //
   4 // Authors:
   5 //      Greg Reinacker (gregr@rassoc.com)
   6 //      Sebastien Pouliot (spouliot@motus.com)
   7 //
   8 // Copyright 2002-2003 Greg Reinacker, Reinacker & Associates, Inc. All rights reserved.
   9 // Portions (C) 2003 Motus Technologies Inc. (http://www.motus.com)
  10 //
  11 // Based on "DigestAuthenticationModule.cs". Original source code available at
  12 // http://www.rassoc.com/gregr/weblog/stories/2002/07/09/webServicesSecurityHttpDigestAuthenticationWithoutActiveDirectory.html
  13 //
  14
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System;
  37 using System.Configuration;
  38 using System.IO;
  39 using System.Security.Principal;
  40 using System.Text;
  41 using System.Web;
  42 using System.Xml;
  43
  44 namespace Mono.Http.Modules
  45 {
  46         public class BasicAuthenticationModule : AuthenticationModule
  47         {
  48                 static char[] separator = {':'};
  49
  50                 public BasicAuthenticationModule () : base ("Basic") {}
  51
  52                 protected override bool AcceptCredentials (HttpApplication app, string authentication)
  53                 {
  54                         byte[] userpass = Convert.FromBase64String (authentication);
  55                         string[] up = Encoding.UTF8.GetString (userpass).Split (separator);
  56                         string username = up [0];
  57                         string password = up [1];
  58
  59                         string userFileName = app.Request.MapPath (ConfigurationSettings.AppSettings ["Basic.Users"]);
  60                         if (userFileName == null || !File.Exists (userFileName))
  61                                 return false;
  62
  63                         XmlDocument userDoc = new XmlDocument ();
  64                         userDoc.Load (userFileName);
  65
  66                         string xPath = String.Format ("/users/user[@name='{0}']", username);
  67                         XmlNode user = userDoc.SelectSingleNode (xPath);
  68
  69                         if (user == null)
  70                                 return false;
  71
  72                         XmlAttribute att = user.Attributes ["password"];
  73                         if (att == null || password != att.Value)
  74                                 return false;
  75
  76                         XmlNodeList roleNodes = user.SelectNodes ("role");
  77                         string[] roles = new string [roleNodes.Count];
  78                         int i = 0;
  79                         foreach (XmlNode xn in roleNodes) {
  80                                 XmlAttribute rolename = xn.Attributes ["name"];
  81                                 if (rolename == null)
  82                                         continue;
  83
  84                                 roles [i++] = rolename.Value;
  85                         }
  86                         app.Context.User = new GenericPrincipal (new GenericIdentity (username, AuthenticationMethod), roles);
  87                         return true;
  88                 }
  89
  90                 #region Event Handlers
  91
  92                 // We add the WWW-Authenticate header here, so if an authorization
  93                 // fails elsewhere than in this module, we can still request authentication
  94                 // from the client.
  95                 public override void OnEndRequest (object source, EventArgs eventArgs)
  96                 {
  97                         HttpApplication app = (HttpApplication) source;
  98                         if (app.Response.StatusCode != 401 || !AuthenticationRequired)
  99                                 return;
 100
 101                         string realm = ConfigurationSettings.AppSettings ["Basic.Realm"];
 102                         string challenge = String.Format ("{0} realm=\"{1}\"", AuthenticationMethod, realm);
 103                         app.Response.AppendHeader ("WWW-Authenticate", challenge);
 104                 }
 105
 106                 #endregion
 107         }
 108 }