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 #if NET_2_0
  35 using System.Net.Configuration;
  36 #endif
  37
  38 namespace System.Net
  39 {
  40         public class AuthenticationManager
  41         {
  42                 static ArrayList modules;
  43                 static object locker = new object ();
  44
  45                 private AuthenticationManager ()
  46                 {
  47                 }
  48
  49                 static void EnsureModules ()
  50                 {
  51                         lock (locker) {
  52                                 if (modules != null)
  53                                         return;
  54
  55                                 modules = new ArrayList ();
  56 #if NET_2_0 && CONFIGURATION_DEP
  57                                 object cfg = ConfigurationManager.GetSection ("system.net/authenticationModules");
  58                                 AuthenticationModulesSection s = cfg as AuthenticationModulesSection;
  59                                 if (s != null) {
  60                                         foreach (AuthenticationModuleElement element in s.AuthenticationModules) {
  61                                                 IAuthenticationModule module = null;
  62                                                 try {
  63                                                         Type type = Type.GetType (element.Type, true);
  64                                                         module = (IAuthenticationModule) Activator.CreateInstance (type);
  65                                                 } catch {}
  66                                                 modules.Add (module);
  67                                         }
  68                                 }
  69 #else
  70                                 ConfigurationSettings.GetConfig ("system.net/authenticationModules");
  71 #endif
  72                         }
  73                 }
  74
  75                 public static IEnumerator RegisteredModules {
  76                         get {
  77                                 EnsureModules ();
  78                                 return modules.GetEnumerator ();
  79                         }
  80                 }
  81
  82                 internal static void Clear ()
  83                 {
  84                         EnsureModules ();
  85                         lock (modules)
  86                                 modules.Clear ();
  87                 }
  88
  89                 public static Authorization Authenticate (string challenge, WebRequest request, ICredentials credentials)
  90                 {
  91                         if (request == null)
  92                                 throw new ArgumentNullException ("request");
  93
  94                         if (credentials == null)
  95                                 throw new ArgumentNullException ("credentials");
  96
  97                         if (challenge == null)
  98                                 throw new ArgumentNullException ("challenge");
  99
 100                         return DoAuthenticate (challenge, request, credentials);
 101                 }
 102
 103                 static Authorization DoAuthenticate (string challenge, WebRequest request, ICredentials credentials)
 104                 {
 105                         EnsureModules ();
 106                         lock (modules) {
 107                                 foreach (IAuthenticationModule mod in modules) {
 108                                         Authorization auth = mod.Authenticate (challenge, request, credentials);
 109                                         if (auth == null)
 110                                                 continue;
 111
 112                                         auth.Module = mod;
 113                                         return auth;
 114                                 }
 115                         }
 116
 117                         return null;
 118                 }
 119
 120                 public static Authorization PreAuthenticate (WebRequest request, ICredentials credentials)
 121                 {
 122                         if (request == null)
 123                                 throw new ArgumentNullException ("request");
 124
 125                         if (credentials == null)
 126                                 return null;
 127
 128                         EnsureModules ();
 129                         lock (modules) {
 130                                 foreach (IAuthenticationModule mod in modules) {
 131                                         Authorization auth = mod.PreAuthenticate (request, credentials);
 132                                         if (auth == null)
 133                                                 continue;
 134
 135                                         auth.Module = mod;
 136                                         return auth;
 137                                 }
 138                         }
 139
 140                         return null;
 141                 }
 142
 143                 public static void Register (IAuthenticationModule authenticationModule)
 144                 {
 145                         if (authenticationModule == null)
 146                                 throw new ArgumentNullException ("authenticationModule");
 147
 148                         DoUnregister (authenticationModule.AuthenticationType, false);
 149                         lock (modules)
 150                                 modules.Add (authenticationModule);
 151                 }
 152
 153                 public static void Unregister (IAuthenticationModule authenticationModule)
 154                 {
 155                         if (authenticationModule == null)
 156                                 throw new ArgumentNullException ("authenticationModule");
 157
 158                         DoUnregister (authenticationModule.AuthenticationType, true);
 159                 }
 160
 161                 public static void Unregister (string authenticationScheme)
 162                 {
 163                         if (authenticationScheme == null)
 164                                 throw new ArgumentNullException ("authenticationScheme");
 165
 166                         DoUnregister (authenticationScheme, true);
 167                 }
 168
 169                 static void DoUnregister (string authenticationScheme, bool throwEx)
 170                 {
 171                         EnsureModules ();
 172                         lock (modules) {
 173                                 IAuthenticationModule module = null;
 174                                 foreach (IAuthenticationModule mod in modules) {
 175                                         string modtype = mod.AuthenticationType;
 176                                         if (String.Compare (modtype, authenticationScheme, true) == 0) {
 177                                                 module = mod;
 178                                                 break;
 179                                         }
 180                                 }
 181
 182                                 if (module == null) {
 183                                         if (throwEx)
 184                                                 throw new InvalidOperationException ("Scheme not registered.");
 185                                 } else {
 186                                         modules.Remove (module);
 187                                 }
 188                         }
 189                 }
 190         }
 191 }
 192