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         public class ValidationResult
  40         {
  41                 bool trusted;
  42                 bool user_denied;
  43                 int error_code;
  44                 MonoSslPolicyErrors? policy_errors;
  45
  46                 public ValidationResult (bool trusted, bool user_denied, int error_code, MonoSslPolicyErrors? policy_errors)
  47                 {
  48                         this.trusted = trusted;
  49                         this.user_denied = user_denied;
  50                         this.error_code = error_code;
  51                         this.policy_errors = policy_errors;
  52                 }
  53
  54                 internal ValidationResult (bool trusted, bool user_denied, int error_code)
  55                 {
  56                         this.trusted = trusted;
  57                         this.user_denied = user_denied;
  58                         this.error_code = error_code;
  59                 }
  60
  61                 public bool Trusted {
  62                         get { return trusted; }
  63                 }
  64
  65                 public bool UserDenied {
  66                         get { return user_denied; }
  67                 }
  68
  69                 public int ErrorCode {
  70                         get { return error_code; }
  71                 }
  72
  73                 public MonoSslPolicyErrors? PolicyErrors {
  74                         get { return policy_errors; }
  75                 }
  76         }
  77
  78         /**
  79          * Internal interface - do not implement
  80          */
  81         public interface ICertificateValidator
  82         {
  83                 MonoTlsSettings Settings {
  84                         get;
  85                 }
  86
  87                 /*
  88                  * Returns `true` if a client certificate has been selected (which could be `null`).
  89                  */
  90                 bool SelectClientCertificate (
  91                         string targetHost, X509CertificateCollection localCertificates, X509Certificate remoteCertificate,
  92                         string[] acceptableIssuers, out X509Certificate clientCertificate);
  93
  94                 /*
  95                  * If @serverMode is true, then we're a server and want to validate a certificate that we received from a client.
  96                  */
  97                 ValidationResult ValidateCertificate (string targetHost, bool serverMode, X509CertificateCollection certificates);
  98
  99                 /*
 100                  * On OS X and Mobile, the @chain will be initialized with the @certificates, but not actually built.
 101                  */
 102                 bool InvokeSystemValidator (
 103                         string targetHost, bool serverMode, X509CertificateCollection certificates,
 104                         X509Chain chain, ref MonoSslPolicyErrors errors, ref int status11);
 105         }
 106
 107         public static class CertificateValidationHelper
 108         {
 109                 const string SecurityLibrary = "/System/Library/Frameworks/Security.framework/Security";
 110                 static readonly bool noX509Chain;
 111                 static readonly bool supportsTrustAnchors;
 112
 113                 static CertificateValidationHelper ()
 114                 {
 115                         #if MONOTOUCH || XAMMAC
 116                         noX509Chain = true;
 117                         supportsTrustAnchors = true;
 118                         #elif MONODROID
 119                         noX509Chain = true;
 120                         supportsTrustAnchors = false;
 121                         #else
 122                         if (File.Exists (SecurityLibrary)) {
 123                                 noX509Chain = true;
 124                                 supportsTrustAnchors = true;
 125                         } else {
 126                                 noX509Chain = false;
 127                                 supportsTrustAnchors = false;
 128                         }
 129                         #endif
 130                 }
 131
 132                 public static bool SupportsX509Chain {
 133                         get { return !noX509Chain; }
 134                 }
 135
 136                 public static bool SupportsTrustAnchors {
 137                         get { return supportsTrustAnchors; }
 138                 }
 139
 140                 static ICertificateValidator GetDefaultValidator (MonoTlsProvider provider, MonoTlsSettings settings)
 141                 {
 142                         return (ICertificateValidator)NoReflectionHelper.GetDefaultCertificateValidator (provider, settings);
 143                 }
 144
 145                 /*
 146                  * Internal API, intended to be used by MonoTlsProvider implementations.
 147                  */
 148                 public static ICertificateValidator GetValidator (MonoTlsProvider provider, MonoTlsSettings settings)
 149                 {
 150                         return GetDefaultValidator (provider, settings);
 151                 }
 152
 153                 /*
 154                  * Use this overloaded version in user code.
 155                  */
 156                 public static ICertificateValidator GetValidator (MonoTlsSettings settings)
 157                 {
 158                         return GetDefaultValidator (null, settings);
 159                 }
 160         }
 161 }