mcs/class/System/System.Net/AuthenticationManager.cs

   1 //
   2 // System.Net.AuthenticationManager.cs
   3 //
   4 // Author:
   5 //      Miguel de Icaza (miguel@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (C) 2002,2003 Ximian, Inc. (http://www.ximian.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Collections;
  33 using System.Configuration;
  34
  35 namespace System.Net
  36 {
  37         public class AuthenticationManager
  38         {
  39                 static ArrayList modules;
  40                 static object locker = new object ();
  41
  42                 private AuthenticationManager ()
  43                 {
  44                 }
  45
  46                 static void EnsureModules ()
  47                 {
  48                         lock (locker) {
  49                                 if (modules != null)
  50                                         return;
  51
  52                                 modules = new ArrayList ();
  53                                 ConfigurationSettings.GetConfig ("system.net/authenticationModules");
  54                         }
  55                 }
  56
  57                 public static IEnumerator RegisteredModules {
  58                         get {
  59                                 EnsureModules ();
  60                                 return modules.GetEnumerator ();
  61                         }
  62                 }
  63
  64                 internal static void Clear ()
  65                 {
  66                         EnsureModules ();
  67                         lock (modules)
  68                                 modules.Clear ();
  69                 }
  70
  71                 public static Authorization Authenticate (string challenge, WebRequest request, ICredentials credentials)
  72                 {
  73                         if (request == null)
  74                                 throw new ArgumentNullException ("request");
  75
  76                         if (credentials == null)
  77                                 throw new ArgumentNullException ("credentials");
  78
  79                         if (challenge == null)
  80                                 throw new ArgumentNullException ("challenge");
  81
  82                         return DoAuthenticate (challenge, request, credentials);
  83                 }
  84
  85                 static Authorization DoAuthenticate (string challenge, WebRequest request, ICredentials credentials)
  86                 {
  87                         EnsureModules ();
  88                         lock (modules) {
  89                                 foreach (IAuthenticationModule mod in modules) {
  90                                         Authorization auth = mod.Authenticate (challenge, request, credentials);
  91                                         if (auth == null)
  92                                                 continue;
  93
  94                                         auth.Module = mod;
  95                                         return auth;
  96                                 }
  97                         }
  98
  99                         return null;
 100                 }
 101
 102                 public static Authorization PreAuthenticate (WebRequest request, ICredentials credentials)
 103                 {
 104                         if (request == null)
 105                                 throw new ArgumentNullException ("request");
 106
 107                         if (credentials == null)
 108                                 return null;
 109
 110                         EnsureModules ();
 111                         lock (modules) {
 112                                 foreach (IAuthenticationModule mod in modules) {
 113                                         Authorization auth = mod.PreAuthenticate (request, credentials);
 114                                         if (auth == null)
 115                                                 continue;
 116
 117                                         auth.Module = mod;
 118                                         return auth;
 119                                 }
 120                         }
 121
 122                         return null;
 123                 }
 124
 125                 public static void Register (IAuthenticationModule authenticationModule)
 126                 {
 127                         if (authenticationModule == null)
 128                                 throw new ArgumentNullException ("authenticationModule");
 129
 130                         DoUnregister (authenticationModule.AuthenticationType, false);
 131                         lock (modules)
 132                                 modules.Add (authenticationModule);
 133                 }
 134
 135                 public static void Unregister (IAuthenticationModule authenticationModule)
 136                 {
 137                         if (authenticationModule == null)
 138                                 throw new ArgumentNullException ("authenticationModule");
 139
 140                         DoUnregister (authenticationModule.AuthenticationType, true);
 141                 }
 142
 143                 public static void Unregister (string authenticationScheme)
 144                 {
 145                         if (authenticationScheme == null)
 146                                 throw new ArgumentNullException ("authenticationScheme");
 147
 148                         DoUnregister (authenticationScheme, true);
 149                 }
 150
 151                 static void DoUnregister (string authenticationScheme, bool throwEx)
 152                 {
 153                         EnsureModules ();
 154                         lock (modules) {
 155                                 IAuthenticationModule module = null;
 156                                 foreach (IAuthenticationModule mod in modules) {
 157                                         string modtype = mod.AuthenticationType;
 158                                         if (String.Compare (modtype, authenticationScheme, true) == 0) {
 159                                                 module = mod;
 160                                                 break;
 161                                         }
 162                                 }
 163
 164                                 if (module == null) {
 165                                         if (throwEx)
 166                                                 throw new InvalidOperationException ("Scheme not registered.");
 167                                 } else {
 168                                         modules.Remove (module);
 169                                 }
 170                         }
 171                 }
 172         }
 173 }
 174