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 class ExtendedKeyUsageExtension : X509Extension {
  48
  49                 private ArrayList keyPurpose;
  50
  51                 public ExtendedKeyUsageExtension () : base ()
  52                 {
  53                         extnOid = "2.5.29.37";
  54                         keyPurpose = new ArrayList ();
  55                 }
  56
  57                 public ExtendedKeyUsageExtension (ASN1 asn1) : base (asn1)
  58                 {
  59                 }
  60
  61                 public ExtendedKeyUsageExtension (X509Extension extension) : base (extension)
  62                 {
  63                 }
  64
  65                 protected override void Decode ()
  66                 {
  67                         keyPurpose = new ArrayList ();
  68                         ASN1 sequence = new ASN1 (extnValue.Value);
  69                         if (sequence.Tag != 0x30)
  70                                 throw new ArgumentException ("Invalid ExtendedKeyUsage extension");
  71                         // for every policy OID
  72                         for (int i=0; i < sequence.Count; i++)
  73                                 keyPurpose.Add (ASN1Convert.ToOid (sequence [i]));
  74                 }
  75
  76                 protected override void Encode ()
  77                 {
  78                         ASN1 seq = new ASN1 (0x30);
  79                         foreach (string oid in keyPurpose) {
  80                                 seq.Add (ASN1Convert.FromOid (oid));
  81                         }
  82
  83                         extnValue = new ASN1 (0x04);
  84                         extnValue.Add (seq);
  85                 }
  86
  87                 public ArrayList KeyPurpose {
  88                         get { return keyPurpose; }
  89                 }
  90
  91                 public override string Name {
  92                         get { return "Extended Key Usage"; }
  93                 }
  94
  95                 // serverAuth           1.3.6.1.5.5.7.3.1
  96                 // clientAuth           1.3.6.1.5.5.7.3.2
  97                 // codeSigning          1.3.6.1.5.5.7.3.3
  98                 // emailProtection      1.3.6.1.5.5.7.3.4
  99                 // timeStamping         1.3.6.1.5.5.7.3.8
 100                 // OCSPSigning          1.3.6.1.5.5.7.3.9
 101                 public override string ToString ()
 102                 {
 103                         StringBuilder sb = new StringBuilder ();
 104                         foreach (string s in keyPurpose) {
 105                                 switch (s) {
 106                                         case "1.3.6.1.5.5.7.3.1":
 107                                                 sb.Append ("Server Authentication");
 108                                                 break;
 109                                         case "1.3.6.1.5.5.7.3.2":
 110                                                 sb.Append ("Client Authentication");
 111                                                 break;
 112                                         case "1.3.6.1.5.5.7.3.3":
 113                                                 sb.Append ("Code Signing");
 114                                                 break;
 115                                         case "1.3.6.1.5.5.7.3.4":
 116                                                 sb.Append ("Email Protection");
 117                                                 break;
 118                                         case "1.3.6.1.5.5.7.3.8":
 119                                                 sb.Append ("Time Stamping");
 120                                                 break;
 121                                         case "1.3.6.1.5.5.7.3.9":
 122                                                 sb.Append ("OCSP Signing");
 123                                                 break;
 124                                         default:
 125                                                 sb.Append ("unknown");
 126                                                 break;
 127                                 }
 128                                 sb.AppendFormat (" ({0}){1}", s, Environment.NewLine);
 129                         }
 130                         return sb.ToString ();
 131                 }
 132         }
 133 }