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

   1 //
   2 // CertificateValidationHelper.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.Threading;
  32 using System.Security.Cryptography.X509Certificates;
  33 using Mono.Security.Protocol.Tls;
  34 using MX = Mono.Security.X509;
  35 using Mono.Net.Security;
  36
  37 namespace Mono.Security.Interface
  38 {
  39         #if (!MONOTOUCH && !MONODROID) || INSIDE_SYSTEM
  40         public class ValidationResult
  41         {
  42                 bool trusted;
  43                 bool user_denied;
  44                 int error_code;
  45                 MonoSslPolicyErrors? policy_errors;
  46
  47                 public ValidationResult (bool trusted, bool user_denied, int error_code, MonoSslPolicyErrors? policy_errors)
  48                 {
  49                         this.trusted = trusted;
  50                         this.user_denied = user_denied;
  51                         this.error_code = error_code;
  52                         this.policy_errors = policy_errors;
  53                 }
  54
  55                 internal ValidationResult (bool trusted, bool user_defined, int error_code)
  56                 {
  57                         this.trusted = trusted;
  58                         this.user_denied = user_denied;
  59                         this.error_code = error_code;
  60                         this.policy_errors = policy_errors;
  61                 }
  62
  63                 public bool Trusted {
  64                         get { return trusted; }
  65                 }
  66
  67                 public bool UserDenied {
  68                         get { return user_denied; }
  69                 }
  70
  71                 public int ErrorCode {
  72                         get { return error_code; }
  73                 }
  74
  75                 public MonoSslPolicyErrors? PolicyErrors {
  76                         get { return policy_errors; }
  77                 }
  78         }
  79
  80         /**
  81          * Internal interface - do not implement
  82          */
  83         public interface ICertificateValidator
  84         {
  85                 MonoTlsSettings Settings {
  86                         get;
  87                 }
  88
  89                 /*
  90                  * Returns `true` if a client certificate has been selected (which could be `null`).
  91                  */
  92                 bool SelectClientCertificate (
  93                         string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate,
  94                         string[] acceptableIssuers, out X509Certificate clientCertificate);
  95
  96                 /*
  97                  * If @serverMode is true, then we're a server and want to validate a certificate that we received from a client.
  98                  */
  99                 ValidationResult ValidateCertificate (string targetHost, bool serverMode, X509CertificateCollection certificates);
 100
 101                 bool InvokeSystemValidator (
 102                         string targetHost, bool serverMode, X509CertificateCollection certificates,
 103                         ref MonoSslPolicyErrors errors, ref int status11);
 104         }
 105
 106         public static class CertificateValidationHelper
 107         {
 108                 const string SecurityLibrary = "/System/Library/Frameworks/Security.framework/Security";
 109                 static readonly bool noX509Chain;
 110                 static readonly bool supportsTrustAnchors;
 111
 112                 static CertificateValidationHelper ()
 113                 {
 114                         #if MONOTOUCH || XAMMAC
 115                         noX509Chain = true;
 116                         supportsTrustAnchors = true;
 117                         #elif MONODROID
 118                         noX509Chain = true;
 119                         supportsTrustAnchors = false;
 120                         #else
 121                         if (File.Exists (SecurityLibrary)) {
 122                                 noX509Chain = true;
 123                                 supportsTrustAnchors = true;
 124                         } else {
 125                                 noX509Chain = false;
 126                                 supportsTrustAnchors = false;
 127                         }
 128                         #endif
 129                 }
 130
 131                 public static bool SupportsX509Chain {
 132                         get { return !noX509Chain; }
 133                 }
 134
 135                 public static bool SupportsTrustAnchors {
 136                         get { return supportsTrustAnchors; }
 137                 }
 138
 139                 static ICertificateValidator GetDefaultValidator (MonoTlsProvider provider, MonoTlsSettings settings)
 140                 {
 141                         return (ICertificateValidator)NoReflectionHelper.GetDefaultCertificateValidator (provider, settings);
 142                 }
 143
 144                 /*
 145                  * Internal API, intended to be used by MonoTlsProvider implementations.
 146                  */
 147                 public static ICertificateValidator GetValidator (MonoTlsProvider provider, MonoTlsSettings settings)
 148                 {
 149                         return GetDefaultValidator (provider, settings);
 150                 }
 151
 152                 /*
 153                  * Use this overloaded version in user code.
 154                  */
 155                 public static ICertificateValidator GetValidator (MonoTlsSettings settings)
 156                 {
 157                         return GetDefaultValidator (null, settings);
 158                 }
 159         }
 160 #endif
 161 }