mcs/class/Mono.Security/Mono.Security.X509.Extensions/ExtendedKeyUsageExtension.cs

   1 //
   2 // ExtendedKeyUsageExtension.cs: Handles X.509 ExtendedKeyUsage extensions.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Collections;
  32 using System.Text;
  33
  34 using Mono.Security;
  35 using Mono.Security.X509;
  36
  37 namespace Mono.Security.X509.Extensions {
  38
  39         /*
  40          * id-ce-extKeyUsage OBJECT IDENTIFIER ::= { id-ce 37 }
  41          *
  42          * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
  43          *
  44          * KeyPurposeId ::= OBJECT IDENTIFIER
  45          */
  46
  47         public
  48         class ExtendedKeyUsageExtension : X509Extension {
  49
  50                 private ArrayList keyPurpose;
  51
  52                 public ExtendedKeyUsageExtension () : base ()
  53                 {
  54                         extnOid = "2.5.29.37";
  55                         keyPurpose = new ArrayList ();
  56                 }
  57
  58                 public ExtendedKeyUsageExtension (ASN1 asn1) : base (asn1)
  59                 {
  60                 }
  61
  62                 public ExtendedKeyUsageExtension (X509Extension extension) : base (extension)
  63                 {
  64                 }
  65
  66                 protected override void Decode ()
  67                 {
  68                         keyPurpose = new ArrayList ();
  69                         ASN1 sequence = new ASN1 (extnValue.Value);
  70                         if (sequence.Tag != 0x30)
  71                                 throw new ArgumentException ("Invalid ExtendedKeyUsage extension");
  72                         // for every policy OID
  73                         for (int i=0; i < sequence.Count; i++)
  74                                 keyPurpose.Add (ASN1Convert.ToOid (sequence [i]));
  75                 }
  76
  77                 protected override void Encode ()
  78                 {
  79                         ASN1 seq = new ASN1 (0x30);
  80                         foreach (string oid in keyPurpose) {
  81                                 seq.Add (ASN1Convert.FromOid (oid));
  82                         }
  83
  84                         extnValue = new ASN1 (0x04);
  85                         extnValue.Add (seq);
  86                 }
  87
  88                 public ArrayList KeyPurpose {
  89                         get { return keyPurpose; }
  90                 }
  91
  92                 public override string Name {
  93                         get { return "Extended Key Usage"; }
  94                 }
  95
  96                 // serverAuth           1.3.6.1.5.5.7.3.1
  97                 // clientAuth           1.3.6.1.5.5.7.3.2
  98                 // codeSigning          1.3.6.1.5.5.7.3.3
  99                 // emailProtection      1.3.6.1.5.5.7.3.4
 100                 // timeStamping         1.3.6.1.5.5.7.3.8
 101                 // OCSPSigning          1.3.6.1.5.5.7.3.9
 102                 public override string ToString ()
 103                 {
 104                         StringBuilder sb = new StringBuilder ();
 105                         foreach (string s in keyPurpose) {
 106                                 switch (s) {
 107                                         case "1.3.6.1.5.5.7.3.1":
 108                                                 sb.Append ("Server Authentication");
 109                                                 break;
 110                                         case "1.3.6.1.5.5.7.3.2":
 111                                                 sb.Append ("Client Authentication");
 112                                                 break;
 113                                         case "1.3.6.1.5.5.7.3.3":
 114                                                 sb.Append ("Code Signing");
 115                                                 break;
 116                                         case "1.3.6.1.5.5.7.3.4":
 117                                                 sb.Append ("Email Protection");
 118                                                 break;
 119                                         case "1.3.6.1.5.5.7.3.8":
 120                                                 sb.Append ("Time Stamping");
 121                                                 break;
 122                                         case "1.3.6.1.5.5.7.3.9":
 123                                                 sb.Append ("OCSP Signing");
 124                                                 break;
 125                                         default:
 126                                                 sb.Append ("unknown");
 127                                                 break;
 128                                 }
 129                                 sb.AppendFormat (" ({0}){1}", s, Environment.NewLine);
 130                         }
 131                         return sb.ToString ();
 132                 }
 133         }
 134 }