class/corlib/System.Security.Policy/PublisherMembershipCondition.cs

   1 //
   2 // PublisherMembershipCondition.cs: Publisher Membership Condition
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // (C) 2002, 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.Collections;
  31 using System.Security.Cryptography.X509Certificates;
  32 using System.Runtime.InteropServices;
  33
  34 using Mono.Security.Cryptography;
  35
  36 namespace System.Security.Policy {
  37
  38         [Serializable]
  39         [ComVisible (true)]
  40         public sealed class PublisherMembershipCondition : IConstantMembershipCondition, IMembershipCondition {
  41
  42                 private readonly int version = 1;
  43
  44                 private X509Certificate x509;
  45
  46                 // so System.Activator.CreateInstance can create an instance...
  47                 internal PublisherMembershipCondition ()
  48                 {
  49                 }
  50
  51                 public PublisherMembershipCondition (X509Certificate certificate)
  52                 {
  53                         if (certificate == null)
  54                                 throw new ArgumentNullException ("certificate");
  55                         // needed to match MS implementation
  56                         if (certificate.GetHashCode () == 0) {
  57                                 throw new ArgumentException ("certificate");
  58                         }
  59                         x509 = certificate;
  60                 }
  61
  62                 public X509Certificate Certificate {
  63                         get { return x509; }
  64                         set {
  65                                 if (value == null)
  66                                         throw new ArgumentNullException ("value");
  67                                 x509 = value;
  68                         }
  69                 }
  70
  71                 public bool Check (Evidence evidence)
  72                 {
  73                         if (evidence == null)
  74                                 return false;
  75
  76                         IEnumerator e = evidence.GetHostEnumerator ();
  77                         while (e.MoveNext ()) {
  78                                 if (e.Current is Publisher) {
  79                                         if (x509.Equals ((e.Current as Publisher).Certificate))
  80                                                 return true;
  81                                 }
  82                         }
  83                         return false;
  84                 }
  85
  86                 public IMembershipCondition Copy ()
  87                 {
  88                         return new PublisherMembershipCondition (x509);
  89                 }
  90
  91                 public override bool Equals (object o)
  92                 {
  93                         PublisherMembershipCondition pmc = (o as PublisherMembershipCondition);
  94                         if (pmc == null)
  95                                 return false;
  96                         return x509.Equals (pmc.Certificate);
  97                 }
  98
  99                 public void FromXml (SecurityElement e)
 100                 {
 101                         FromXml (e, null);
 102                 }
 103
 104                 public void FromXml (SecurityElement e, PolicyLevel level)
 105                 {
 106                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 107                         string cert = e.Attribute ("X509Certificate");
 108                         if (cert != null) {
 109                                 byte[] rawcert = CryptoConvert.FromHex (cert);
 110                                 x509 = new X509Certificate (rawcert);
 111                         }
 112                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 113                 }
 114
 115                 public override int GetHashCode ()
 116                 {
 117                         return x509.GetHashCode ();
 118                 }
 119
 120                 public override string ToString ()
 121                 {
 122                         return "Publisher - " + x509.GetPublicKeyString ();
 123                 }
 124
 125                 public SecurityElement ToXml ()
 126                 {
 127                         return ToXml (null);
 128                 }
 129
 130                 public SecurityElement ToXml (PolicyLevel level)
 131                 {
 132                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 133                         SecurityElement se = MembershipConditionHelper.Element (typeof (PublisherMembershipCondition), version);
 134                         se.AddAttribute ("X509Certificate", x509.GetRawCertDataString ());
 135                         return se;
 136                 }
 137         }
 138 }