mcs/class/System/System.Security.Cryptography.X509Certificates/OSX509Certificates.cs

   1 // Copyright (C) 2010 Novell, Inc (http://www.novell.com)
   2 // Copyright 2012-2014 Xamarin Inc.
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 #if SECURITY_DEP
  24
  25 #if MONOTOUCH || MONODROID
  26 using MSX = Mono.Security.X509;
  27 #else
  28 extern alias MonoSecurity;
  29 using MSX = MonoSecurity::Mono.Security.X509;
  30 #endif
  31
  32 using System;
  33 using System.Runtime.InteropServices;
  34
  35 namespace System.Security.Cryptography.X509Certificates {
  36
  37         static class OSX509Certificates {
  38                 public const string SecurityLibrary = "/System/Library/Frameworks/Security.framework/Security";
  39                 public const string CoreFoundationLibrary = "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation";
  40
  41                 [DllImport (SecurityLibrary)]
  42                 extern static IntPtr SecCertificateCreateWithData (IntPtr allocator, IntPtr nsdataRef);
  43
  44                 [DllImport (SecurityLibrary)]
  45                 extern static /* OSStatus */ int SecTrustCreateWithCertificates (IntPtr certOrCertArray, IntPtr policies, out IntPtr sectrustref);
  46
  47                 [DllImport (SecurityLibrary)]
  48                 extern static IntPtr SecPolicyCreateSSL ([MarshalAs (UnmanagedType.I1)] bool server, IntPtr cfStringHostname);
  49
  50                 [DllImport (SecurityLibrary)]
  51                 extern static /* OSStatus */ int SecTrustEvaluate (IntPtr secTrustRef, out SecTrustResult secTrustResultTime);
  52
  53                 [DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
  54                 extern static IntPtr CFStringCreateWithCharacters (IntPtr allocator, string str, /* CFIndex */ IntPtr count);
  55
  56                 [DllImport (CoreFoundationLibrary)]
  57                 unsafe extern static IntPtr CFDataCreate (IntPtr allocator, byte *bytes, /* CFIndex */ IntPtr length);
  58
  59                 [DllImport (CoreFoundationLibrary)]
  60                 extern static void CFRelease (IntPtr handle);
  61
  62                 [DllImport (CoreFoundationLibrary)]
  63                 extern static IntPtr CFArrayCreate (IntPtr allocator, IntPtr values, /* CFIndex */ IntPtr numValues, IntPtr callbacks);
  64
  65                 // uint32_t
  66                 public enum SecTrustResult {
  67                         Invalid,
  68                         Proceed,
  69                         Confirm,
  70                         Deny,
  71                         Unspecified,
  72                         RecoverableTrustFailure,
  73                         FatalTrustFailure,
  74                         ResultOtherError,
  75                 }
  76
  77                 static IntPtr MakeCFData (byte [] data)
  78                 {
  79                         unsafe {
  80                                 fixed (byte *ptr = &data [0])
  81                                         return CFDataCreate (IntPtr.Zero, ptr, (IntPtr) data.Length);
  82                         }
  83                 }
  84
  85                 static unsafe IntPtr FromIntPtrs (IntPtr [] values)
  86                 {
  87                         fixed (IntPtr* pv = values) {
  88                                 return CFArrayCreate (
  89                                         IntPtr.Zero,
  90                                         (IntPtr) pv,
  91                                         (IntPtr) values.Length,
  92                                         IntPtr.Zero);
  93                         }
  94                 }
  95
  96                 public static SecTrustResult TrustEvaluateSsl (MSX.X509CertificateCollection certificates, string host)
  97                 {
  98                         if (certificates == null)
  99                                 return SecTrustResult.Deny;
 100
 101                         try {
 102                                 return _TrustEvaluateSsl (certificates, host);
 103                         } catch {
 104                                 return SecTrustResult.Deny;
 105                         }
 106                 }
 107
 108                 static SecTrustResult _TrustEvaluateSsl (MSX.X509CertificateCollection certificates, string hostName)
 109                 {
 110                         int certCount = certificates.Count;
 111                         IntPtr [] cfDataPtrs = new IntPtr [certCount];
 112                         IntPtr [] secCerts = new IntPtr [certCount];
 113                         IntPtr certArray = IntPtr.Zero;
 114                         IntPtr sslsecpolicy = IntPtr.Zero;
 115                         IntPtr host = IntPtr.Zero;
 116                         IntPtr sectrust = IntPtr.Zero;
 117                         SecTrustResult result = SecTrustResult.Deny;
 118
 119                         try {
 120                                 for (int i = 0; i < certCount; i++)
 121                                         cfDataPtrs [i] = MakeCFData (certificates [i].RawData);
 122
 123                                 for (int i = 0; i < certCount; i++){
 124                                         secCerts [i] = SecCertificateCreateWithData (IntPtr.Zero, cfDataPtrs [i]);
 125                                         if (secCerts [i] == IntPtr.Zero)
 126                                                 return SecTrustResult.Deny;
 127                                 }
 128                                 certArray = FromIntPtrs (secCerts);
 129                                 host = CFStringCreateWithCharacters (IntPtr.Zero, hostName, (IntPtr) hostName.Length);
 130                                 sslsecpolicy = SecPolicyCreateSSL (true, host);
 131
 132                                 int code = SecTrustCreateWithCertificates (certArray, sslsecpolicy, out sectrust);
 133                                 if (code == 0)
 134                                         code = SecTrustEvaluate (sectrust, out result);
 135                                 return result;
 136                         } finally {
 137                                 for (int i = 0; i < certCount; i++)
 138                                         if (cfDataPtrs [i] != IntPtr.Zero)
 139                                                 CFRelease (cfDataPtrs [i]);
 140
 141                                 if (certArray != IntPtr.Zero)
 142                                         CFRelease (certArray);
 143
 144                                 for (int i = 0; i < certCount; i++)
 145                                         if (secCerts [i] != IntPtr.Zero)
 146                                                 CFRelease (secCerts [i]);
 147
 148                                 if (sslsecpolicy != IntPtr.Zero)
 149                                         CFRelease (sslsecpolicy);
 150                                 if (host != IntPtr.Zero)
 151                                         CFRelease (host);
 152                                 if (sectrust != IntPtr.Zero)
 153                                         CFRelease (sectrust);
 154                         }
 155                 }
 156         }
 157 }
 158 #endif