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 && !ONLY_APPLETLS // ONLY_APPLETLS uses MonoTlsProviderFactory.Apple.cs instead
  28
  29 #if MONO_SECURITY_ALIAS
  30 extern alias MonoSecurity;
  31 using MSI = MonoSecurity::Mono.Security.Interface;
  32 using MX = MonoSecurity::Mono.Security.X509;
  33 #else
  34 using MSI = Mono.Security.Interface;
  35 using MX = Mono.Security.X509;
  36 #endif
  37 using System.Security.Cryptography.X509Certificates;
  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                  */
  63
  64                 internal static MSI.MonoTlsProvider GetProviderInternal ()
  65                 {
  66                         lock (locker) {
  67                                 InitializeInternal ();
  68                                 return defaultProvider;
  69                         }
  70                 }
  71
  72                 internal static void InitializeInternal ()
  73                 {
  74                         lock (locker) {
  75                                 if (initialized)
  76                                         return;
  77
  78                                 MSI.MonoTlsProvider provider;
  79                                 try {
  80                                         provider = CreateDefaultProviderImpl ();
  81                                 } catch (Exception ex) {
  82                                         throw new NotSupportedException ("TLS Support not available.", ex);
  83                                 }
  84
  85                                 if (provider == null)
  86                                         throw new NotSupportedException ("TLS Support not available.");
  87
  88                                 defaultProvider = provider;
  89                                 initialized = true;
  90                         }
  91                 }
  92
  93                 internal static void InitializeInternal (string provider)
  94                 {
  95                         lock (locker) {
  96                                 if (initialized)
  97                                         throw new NotSupportedException ("TLS Subsystem already initialized.");
  98
  99                                 defaultProvider = LookupProvider (provider, true);
 100                                 initialized = true;
 101                         }
 102                 }
 103
 104                 [MethodImpl (MethodImplOptions.InternalCall)]
 105                 internal extern static bool IsBtlsSupported ();
 106
 107                 static object locker = new object ();
 108                 static bool initialized;
 109
 110                 static MSI.MonoTlsProvider defaultProvider;
 111
 112                 #endregion
 113
 114                 static Dictionary<string,string> providerRegistration;
 115
 116                 static Type LookupProviderType (string name, bool throwOnError)
 117                 {
 118                         lock (locker) {
 119                                 InitializeProviderRegistration ();
 120                                 string typeName;
 121                                 if (!providerRegistration.TryGetValue (name, out typeName)) {
 122                                         if (throwOnError)
 123                                                 throw new NotSupportedException (string.Format ("No such TLS Provider: `{0}'.", name));
 124                                         return null;
 125                                 }
 126                                 var type = Type.GetType (typeName, false);
 127                                 if (type == null && throwOnError)
 128                                         throw new NotSupportedException (string.Format ("Could not find TLS Provider: `{0}'.", typeName));
 129                                 return type;
 130                         }
 131                 }
 132
 133                 static MSI.MonoTlsProvider LookupProvider (string name, bool throwOnError)
 134                 {
 135                         var type = LookupProviderType (name, throwOnError);
 136                         if (type == null)
 137                                 return null;
 138
 139                         try {
 140                                 return (MSI.MonoTlsProvider)Activator.CreateInstance (type, true);
 141                         } catch (Exception ex) {
 142                                 throw new NotSupportedException (string.Format ("Unable to instantiate TLS Provider `{0}'.", type), ex);
 143                         }
 144                 }
 145
 146                 static void InitializeProviderRegistration ()
 147                 {
 148                         lock (locker) {
 149                                 if (providerRegistration != null)
 150                                         return;
 151                                 providerRegistration = new Dictionary<string,string> ();
 152                                 providerRegistration.Add ("legacy", "Mono.Net.Security.LegacyTlsProvider");
 153
 154                                 if (Platform.IsMacOS)
 155                                         providerRegistration.Add ("default", "Mono.AppleTls.AppleTlsProvider");
 156                                 else
 157                                         providerRegistration.Add ("default", "Mono.Net.Security.LegacyTlsProvider");
 158
 159                                 if (IsBtlsSupported ())
 160                                         providerRegistration.Add ("btls", "Mono.Btls.MonoBtlsProvider");
 161
 162                                 providerRegistration.Add ("apple", "Mono.AppleTls.AppleTlsProvider");
 163
 164                                 X509Helper2.Initialize ();
 165                         }
 166                 }
 167
 168 #if !MONODROID && !MONOTOUCH && !XAMMAC
 169                 static MSI.MonoTlsProvider TryDynamicLoad ()
 170                 {
 171                         var variable = Environment.GetEnvironmentVariable ("MONO_TLS_PROVIDER");
 172                         if (string.IsNullOrEmpty (variable))
 173                                 variable = "default";
 174
 175                         return LookupProvider (variable, true);
 176                 }
 177
 178                 static MSI.MonoTlsProvider CreateDefaultProviderImpl ()
 179                 {
 180                         var provider = TryDynamicLoad ();
 181                         if (provider != null)
 182                                 return provider;
 183
 184                         return new LegacyTlsProvider ();
 185                 }
 186 #endif
 187
 188                 #region Mono.Security visible API
 189
 190                 /*
 191                  * "Public" section, intended to be consumed via reflection.
 192                  *
 193                  * Mono.Security.dll provides a public wrapper around these.
 194                  */
 195
 196                 internal static MSI.MonoTlsProvider GetProvider ()
 197                 {
 198                         var provider = GetProviderInternal ();
 199                         if (provider == null)
 200                                 throw new NotSupportedException ("No TLS Provider available.");
 201
 202                         return provider;
 203                 }
 204
 205                 internal static bool IsProviderSupported (string name)
 206                 {
 207                         return LookupProvider (name, false) != null;
 208                 }
 209
 210                 internal static MSI.MonoTlsProvider GetProvider (string name)
 211                 {
 212                         return LookupProvider (name, false);
 213                 }
 214
 215                 internal static bool IsInitialized {
 216                         get {
 217                                 lock (locker) {
 218                                         return initialized;
 219                                 }
 220                         }
 221                 }
 222
 223                 internal static void Initialize ()
 224                 {
 225                         InitializeInternal ();
 226                 }
 227
 228                 internal static void Initialize (string provider)
 229                 {
 230                         InitializeInternal (provider);
 231                 }
 232                 #endregion
 233         }
 234 }
 235 #endif