mcs/class/System/Mono.Net.Security/MonoTlsProviderFactory.cs

   1 //
   2 // MonoTlsProviderFactory.cs
   3 //
   4 // Author:
   5 //       Martin Baulig <martin.baulig@xamarin.com>
   6 //
   7 // Copyright (c) 2015 Xamarin, Inc.
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26
  27 #if SECURITY_DEP
  28 #if MONO_SECURITY_ALIAS
  29 extern alias MonoSecurity;
  30 using MSI = MonoSecurity::Mono.Security.Interface;
  31 using MX = MonoSecurity::Mono.Security.X509;
  32 #else
  33 using MSI = Mono.Security.Interface;
  34 using MX = Mono.Security.X509;
  35 #endif
  36 using System.Security.Cryptography.X509Certificates;
  37 #endif
  38
  39 using System;
  40 using System.Net;
  41 using System.Collections.Generic;
  42 using System.Runtime.CompilerServices;
  43
  44 #if !MOBILE
  45 using System.Reflection;
  46 #endif
  47
  48 namespace Mono.Net.Security
  49 {
  50         /*
  51          * Keep in sync with Mono.Security/Mono.Security.Interface/MonoTlsProvider.cs.
  52          *
  53          */
  54         static partial class MonoTlsProviderFactory
  55         {
  56                 #region Internal API
  57
  58                 /*
  59                  * APIs in this section are for consumption within System.dll only - do not access via
  60                  * reflection or from friend assemblies.
  61                  *
  62                  * @IMonoTlsProvider is defined as empty interface outside 'SECURITY_DEP', so we don't need
  63                  * this conditional here.
  64                  */
  65
  66                 internal static IMonoTlsProvider GetProviderInternal ()
  67                 {
  68                         #if SECURITY_DEP
  69                         lock (locker) {
  70                                 InitializeInternal ();
  71                                 return defaultProvider;
  72                         }
  73                         #else
  74                         throw new NotSupportedException ("TLS Support not available.");
  75                         #endif
  76                 }
  77
  78 #if SECURITY_DEP
  79                 internal static void InitializeInternal ()
  80                 {
  81                         lock (locker) {
  82                                 if (initialized)
  83                                         return;
  84
  85                                 MSI.MonoTlsProvider provider;
  86                                 try {
  87                                         provider = CreateDefaultProviderImpl ();
  88                                 } catch (Exception ex) {
  89                                         throw new NotSupportedException ("TLS Support not available.", ex);
  90                                 }
  91
  92                                 if (provider == null)
  93                                         throw new NotSupportedException ("TLS Support not available.");
  94
  95                                 defaultProvider = new Private.MonoTlsProviderWrapper (provider);
  96                                 initialized = true;
  97                         }
  98                 }
  99
 100                 internal static void InitializeInternal (string provider)
 101                 {
 102                         lock (locker) {
 103                                 if (initialized)
 104                                         throw new NotSupportedException ("TLS Subsystem already initialized.");
 105
 106                                 var msiProvider = LookupProvider (provider, true);
 107                                 defaultProvider = new Private.MonoTlsProviderWrapper (msiProvider);
 108                                 initialized = true;
 109                         }
 110                 }
 111
 112                 [MethodImpl (MethodImplOptions.InternalCall)]
 113                 internal extern static bool IsBtlsSupported ();
 114
 115                 static object locker = new object ();
 116                 static bool initialized;
 117
 118                 static IMonoTlsProvider defaultProvider;
 119 #endif
 120                 #endregion
 121
 122 #if SECURITY_DEP
 123
 124                 static Dictionary<string,string> providerRegistration;
 125
 126                 static Type LookupProviderType (string name, bool throwOnError)
 127                 {
 128                         lock (locker) {
 129                                 InitializeProviderRegistration ();
 130                                 string typeName;
 131                                 if (!providerRegistration.TryGetValue (name, out typeName)) {
 132                                         if (throwOnError)
 133                                                 throw new NotSupportedException (string.Format ("No such TLS Provider: `{0}'.", name));
 134                                         return null;
 135                                 }
 136                                 var type = Type.GetType (typeName, false);
 137                                 if (type == null && throwOnError)
 138                                         throw new NotSupportedException (string.Format ("Could not find TLS Provider: `{0}'.", typeName));
 139                                 return type;
 140                         }
 141                 }
 142
 143                 static MSI.MonoTlsProvider LookupProvider (string name, bool throwOnError)
 144                 {
 145                         var type = LookupProviderType (name, throwOnError);
 146                         if (type == null)
 147                                 return null;
 148
 149                         try {
 150                                 return (MSI.MonoTlsProvider)Activator.CreateInstance (type, true);
 151                         } catch (Exception ex) {
 152                                 throw new NotSupportedException (string.Format ("Unable to instantiate TLS Provider `{0}'.", type), ex);
 153                         }
 154                 }
 155
 156                 static void InitializeProviderRegistration ()
 157                 {
 158                         lock (locker) {
 159                                 if (providerRegistration != null)
 160                                         return;
 161                                 providerRegistration = new Dictionary<string,string> ();
 162                                 providerRegistration.Add ("legacy", "Mono.Net.Security.LegacyTlsProvider");
 163                                 providerRegistration.Add ("default", "Mono.Net.Security.LegacyTlsProvider");
 164                                 if (IsBtlsSupported ())
 165                                         providerRegistration.Add ("btls", "Mono.Btls.MonoBtlsProvider");
 166                                 X509Helper2.Initialize ();
 167                         }
 168                 }
 169
 170 #if !MONODROID && !MONOTOUCH && !XAMMAC
 171                 static MSI.MonoTlsProvider TryDynamicLoad ()
 172                 {
 173                         var variable = Environment.GetEnvironmentVariable ("MONO_TLS_PROVIDER");
 174                         if (string.IsNullOrEmpty (variable))
 175                                 variable = "default";
 176
 177                         return LookupProvider (variable, true);
 178                 }
 179
 180                 static MSI.MonoTlsProvider CreateDefaultProviderImpl ()
 181                 {
 182                         var provider = TryDynamicLoad ();
 183                         if (provider != null)
 184                                 return provider;
 185
 186                         return new LegacyTlsProvider ();
 187                 }
 188 #endif
 189
 190                 #region Mono.Security visible API
 191
 192                 /*
 193                  * "Public" section, intended to be consumed via reflection.
 194                  *
 195                  * Mono.Security.dll provides a public wrapper around these.
 196                  */
 197
 198                 internal static MSI.MonoTlsProvider GetProvider ()
 199                 {
 200                         var provider = GetProviderInternal ();
 201                         if (provider == null)
 202                                 throw new NotSupportedException ("No TLS Provider available.");
 203
 204                         return provider.Provider;
 205                 }
 206
 207                 internal static bool IsProviderSupported (string name)
 208                 {
 209                         return LookupProvider (name, false) != null;
 210                 }
 211
 212                 internal static MSI.MonoTlsProvider GetProvider (string name)
 213                 {
 214                         return LookupProvider (name, false);
 215                 }
 216
 217                 internal static bool IsInitialized {
 218                         get {
 219                                 lock (locker) {
 220                                         return initialized;
 221                                 }
 222                         }
 223                 }
 224
 225                 internal static void Initialize ()
 226                 {
 227                         #if SECURITY_DEP
 228                         InitializeInternal ();
 229                         #else
 230                         throw new NotSupportedException ("TLS Support not available.");
 231                         #endif
 232                 }
 233
 234                 internal static void Initialize (string provider)
 235                 {
 236                         #if SECURITY_DEP
 237                         InitializeInternal (provider);
 238                         #else
 239                         throw new NotSupportedException ("TLS Support not available.");
 240                         #endif
 241                 }
 242
 243                 internal static HttpWebRequest CreateHttpsRequest (Uri requestUri, MSI.MonoTlsProvider provider, MSI.MonoTlsSettings settings)
 244                 {
 245                         lock (locker) {
 246                                 var internalProvider = provider != null ? new Private.MonoTlsProviderWrapper (provider) : null;
 247                                 return new HttpWebRequest (requestUri, internalProvider, settings);
 248                         }
 249                 }
 250
 251                 internal static HttpListener CreateHttpListener (X509Certificate certificate, MSI.MonoTlsProvider provider, MSI.MonoTlsSettings settings)
 252                 {
 253                         lock (locker) {
 254                                 var internalProvider = provider != null ? new Private.MonoTlsProviderWrapper (provider) : null;
 255                                 return new HttpListener (certificate, internalProvider, settings);
 256                         }
 257                 }
 258                 #endregion
 259
 260 #endif
 261
 262         }
 263 }
 264