mcs/class/Mono.Security/Mono.Security.Interface/MonoTlsProvider.cs

   1 //
   2 // MonoTlsProvider.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 using System;
  28 using System.IO;
  29 using System.Net;
  30 using System.Net.Security;
  31 using System.Security.Authentication;
  32 using System.Security.Cryptography.X509Certificates;
  33 using Mono.Security.Protocol.Tls;
  34
  35 namespace Mono.Security.Interface
  36 {
  37         /*
  38          * Unfortunately, we can't use the public definitions from System.dll here, so we need to
  39          * copy these.
  40          *
  41          * The @MonoRemoteCertificateValidationCallback also has an additional 'targetHost' argument.
  42          *
  43          */
  44
  45         [Flags]
  46         public enum MonoSslPolicyErrors
  47         {
  48                 None = 0,
  49                 RemoteCertificateNotAvailable = 1,
  50                 RemoteCertificateNameMismatch = 2,
  51                 RemoteCertificateChainErrors = 4,
  52         }
  53
  54         public enum MonoEncryptionPolicy
  55         {
  56                 // Prohibit null ciphers (current system defaults)
  57                 RequireEncryption = 0,
  58
  59                 // Add null ciphers to current system defaults
  60                 AllowNoEncryption,
  61
  62                 // Request null ciphers only
  63                 NoEncryption
  64         }
  65
  66         public delegate bool MonoRemoteCertificateValidationCallback (
  67                 string targetHost, X509Certificate certificate, X509Chain chain, MonoSslPolicyErrors sslPolicyErrors);
  68
  69         public delegate X509Certificate MonoLocalCertificateSelectionCallback (
  70                 string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate,
  71                 string[] acceptableIssuers);
  72
  73         public abstract class MonoTlsProvider
  74         {
  75 #region SslStream
  76
  77                 /*
  78                  * This section abstracts the @SslStream class.
  79                  *
  80                  */
  81
  82                 public abstract bool SupportsSslStream {
  83                         get;
  84                 }
  85
  86                 /*
  87                  * Whether or not this TLS Provider supports Mono-specific extensions
  88                  * (via @MonoTlsSettings).
  89                  */
  90                 public abstract bool SupportsMonoExtensions {
  91                         get;
  92                 }
  93
  94                 public abstract SslProtocols SupportedProtocols {
  95                         get;
  96                 }
  97
  98                 /*
  99                  * Obtain a @MonoSslStream instance.
 100                  *
 101                  */
 102                 public abstract MonoSslStream CreateSslStream (
 103                         Stream innerStream, bool leaveInnerStreamOpen,
 104                         MonoTlsSettings settings = null);
 105
 106 #endregion
 107
 108 #region Certificate Validation
 109
 110                 /*
 111                  * Allows a TLS provider to provide a custom system certificiate validator.
 112                  */
 113                 public virtual bool HasCustomSystemCertificateValidator {
 114                         get { return false; }
 115                 }
 116
 117                 /*
 118                  * If @serverMode is true, then we're a server and want to validate a certificate
 119                  * that we received from a client.
 120                  *
 121                  * On OS X and Mobile, the @chain will be initialized with the @certificates, but not actually built.
 122                  *
 123                  * Returns `true` if certificate validation has been performed and `false` to invoke the
 124                  * default system validator.
 125                  */
 126                 public virtual bool InvokeSystemCertificateValidator (
 127                         ICertificateValidator validator, string targetHost, bool serverMode,
 128                         X509CertificateCollection certificates, X509Chain chain, out bool success,
 129                         ref MonoSslPolicyErrors errors, ref int status11)
 130                 {
 131                         success = false;
 132                         return false;
 133                 }
 134
 135 #endregion
 136
 137 #region Manged SSPI
 138
 139                 /*
 140                  * The managed SSPI implementation from the new TLS code.
 141                  */
 142
 143                 public abstract bool SupportsTlsContext {
 144                         get;
 145                 }
 146
 147                 public abstract IMonoTlsContext CreateTlsContext (
 148                         string hostname, bool serverMode, TlsProtocols protocolFlags,
 149                         X509Certificate serverCertificate, X509CertificateCollection clientCertificates,
 150                         bool remoteCertRequired, MonoEncryptionPolicy encryptionPolicy,
 151                         MonoTlsSettings settings);
 152
 153 #endregion
 154         }
 155 }