mcs/class/System/System.Security.Cryptography.X509Certificates/X509EnhancedKeyUsageExtension.cs

   1 //
   2 // System.Security.Cryptography.X509EnhancedKeyUsageExtension
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if SECURITY_DEP
  30
  31 extern alias MonoSecurity;
  32
  33 using System.Text;
  34
  35 using MonoSecurity::Mono.Security;
  36
  37 namespace System.Security.Cryptography.X509Certificates {
  38
  39         public sealed class X509EnhancedKeyUsageExtension : X509Extension {
  40
  41                 internal const string oid = "2.5.29.37";
  42                 internal const string friendlyName = "Enhanced Key Usage";
  43
  44                 private OidCollection _enhKeyUsage;
  45                 private AsnDecodeStatus _status;
  46
  47                 // constructors
  48
  49                 public X509EnhancedKeyUsageExtension ()
  50                 {
  51                         _oid = new Oid (oid, friendlyName);
  52                 }
  53
  54                 public X509EnhancedKeyUsageExtension (AsnEncodedData encodedEnhancedKeyUsages, bool critical)
  55                 {
  56                         // ignore the Oid provided by encodedKeyUsage (our rules!)
  57                         _oid = new Oid (oid, friendlyName);
  58                         _raw = encodedEnhancedKeyUsages.RawData;
  59                         base.Critical = critical;
  60                         _status = Decode (this.RawData);
  61                 }
  62
  63                 public X509EnhancedKeyUsageExtension (OidCollection enhancedKeyUsages, bool critical)
  64                 {
  65                         if (enhancedKeyUsages == null)
  66                                 throw new ArgumentNullException ("enhancedKeyUsages");
  67
  68                         _oid = new Oid (oid, friendlyName);
  69                         base.Critical = critical;
  70                         _enhKeyUsage = enhancedKeyUsages.ReadOnlyCopy ();
  71                         RawData = Encode ();
  72                 }
  73
  74                 // properties
  75
  76                 public OidCollection EnhancedKeyUsages {
  77                         get {
  78                                 switch (_status) {
  79                                 case AsnDecodeStatus.Ok:
  80                                 case AsnDecodeStatus.InformationNotAvailable:
  81                                         if (_enhKeyUsage == null)
  82                                                 _enhKeyUsage = new OidCollection ();
  83                                         _enhKeyUsage.ReadOnly = true;
  84                                         return _enhKeyUsage;
  85                                 default:
  86                                         throw new CryptographicException ("Badly encoded extension.");
  87                                 }
  88                         }
  89                 }
  90
  91                 // methods
  92
  93                 public override void CopyFrom (AsnEncodedData asnEncodedData)
  94                 {
  95                         if (asnEncodedData == null)
  96                                 throw new ArgumentNullException ("encodedData");
  97
  98                         X509Extension ex = (asnEncodedData as X509Extension);
  99                         if (ex == null)
 100                                 throw new ArgumentException (Locale.GetText ("Wrong type."), "asnEncodedData");
 101
 102                         if (ex._oid == null)
 103                                 _oid = new Oid (oid, friendlyName);
 104                         else
 105                                 _oid = new Oid (ex._oid);
 106
 107                         RawData = ex.RawData;
 108                         base.Critical = ex.Critical;
 109                         // and we deal with the rest later
 110                         _status = Decode (this.RawData);
 111                 }
 112
 113                 // internal
 114
 115                 internal AsnDecodeStatus Decode (byte[] extension)
 116                 {
 117                         if ((extension == null) || (extension.Length == 0))
 118                                 return AsnDecodeStatus.BadAsn;
 119                         if (extension [0] != 0x30)
 120                                 return AsnDecodeStatus.BadTag;
 121
 122                         if (_enhKeyUsage == null)
 123                                 _enhKeyUsage = new OidCollection ();
 124
 125                         try {
 126                                 ASN1 ex = new ASN1 (extension);
 127                                 if (ex.Tag != 0x30)
 128                                         throw new CryptographicException (Locale.GetText ("Invalid ASN.1 Tag"));
 129                                 for (int i=0; i < ex.Count; i++) {
 130                                         _enhKeyUsage.Add (new Oid (ASN1Convert.ToOid (ex [i])));
 131                                 }
 132                         }
 133                         catch {
 134                                 return AsnDecodeStatus.BadAsn;
 135                         }
 136
 137                         return AsnDecodeStatus.Ok;
 138                 }
 139
 140                 internal byte[] Encode ()
 141                 {
 142                         ASN1 ex = new ASN1 (0x30);
 143                         foreach (Oid oid in _enhKeyUsage) {
 144                                 ex.Add (ASN1Convert.FromOid (oid.Value));
 145                         }
 146                         return ex.GetBytes ();
 147                 }
 148
 149                 internal override string ToString (bool multiLine)
 150                 {
 151                         switch (_status) {
 152                         case AsnDecodeStatus.BadAsn:
 153                                 return String.Empty;
 154                         case AsnDecodeStatus.BadTag:
 155                         case AsnDecodeStatus.BadLength:
 156                                 return FormatUnkownData (_raw);
 157                         case AsnDecodeStatus.InformationNotAvailable:
 158                                 return "Information Not Available";
 159                         }
 160
 161                         if (_oid.Value != oid)
 162                                 return String.Format ("Unknown Key Usage ({0})", _oid.Value);
 163                         if (_enhKeyUsage.Count == 0)
 164                                 return "Information Not Available";
 165
 166                         StringBuilder sb = new StringBuilder ();
 167
 168                         for (int i=0; i < _enhKeyUsage.Count; i++) {
 169                                 Oid o = _enhKeyUsage [i];
 170                                 switch (o.Value) {
 171                                 case "1.3.6.1.5.5.7.3.1":
 172                                         sb.Append ("Server Authentication (");
 173                                         break;
 174                                 default:
 175                                         sb.Append ("Unknown Key Usage (");
 176                                         break;
 177                                 }
 178                                 sb.Append (o.Value);
 179                                 sb.Append (")");
 180
 181                                 if (multiLine)
 182                                         sb.Append (Environment.NewLine);
 183                                 else if (i != (_enhKeyUsage.Count - 1))
 184                                         sb.Append (", ");
 185                         }
 186
 187                         return sb.ToString ();
 188                 }
 189         }
 190 }
 191
 192 #endif