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

   1 //
   2 // PublisherMembershipCondition.cs: Publisher Membership Condition
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (spouliot@motus.com)
   6 //
   7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
   8 //
   9
  10 using System;
  11 using System.Collections;
  12 using System.Security.Cryptography.X509Certificates;
  13 using System.Text;
  14
  15 namespace System.Security.Policy {
  16
  17         [Serializable]
  18         public sealed class PublisherMembershipCondition
  19                 : IConstantMembershipCondition, IMembershipCondition, ISecurityEncodable, ISecurityPolicyEncodable {
  20
  21                 private X509Certificate x509;
  22
  23                 // LAMESPEC: Undocumented ArgumentNullException exception
  24                 public PublisherMembershipCondition (X509Certificate certificate)
  25                 {
  26                         if (certificate == null)
  27                                 throw new ArgumentNullException ("certificate");
  28                         // needed to match MS implementation
  29                         if (certificate.GetRawCertData() == null)
  30                                 throw new NullReferenceException ("certificate");
  31                         x509 = certificate;
  32                 }
  33
  34                 // LAMESPEC: Undocumented ArgumentNullException exception
  35                 public X509Certificate Certificate {
  36                         get { return x509; }
  37                         set {
  38                                 if (value == null)
  39                                         throw new ArgumentNullException ("value");
  40                                 x509 = value;
  41                         }
  42                 }
  43
  44                 public bool Check (Evidence evidence)
  45                 {
  46                         IEnumerator e = evidence.GetHostEnumerator ();
  47                         while (e.MoveNext ()) {
  48                                 if (e.Current is Publisher) {
  49                                         if (x509.Equals ((e.Current as Publisher).Certificate))
  50                                                 return true;
  51                                 }
  52                         }
  53                         return false;
  54                 }
  55
  56                 public IMembershipCondition Copy ()
  57                 {
  58                         return new PublisherMembershipCondition (x509);
  59                 }
  60
  61                 public override bool Equals (object o)
  62                 {
  63                         if (!(o is PublisherMembershipCondition))
  64                                 throw new ArgumentException ("not a PublisherMembershipCondition");
  65                         return x509.Equals ((o as PublisherMembershipCondition).Certificate);
  66                 }
  67
  68                 public void FromXml (SecurityElement e)
  69                 {
  70                         FromXml (e, null);
  71                 }
  72
  73                 private byte FromHexChar (char c)
  74                 {
  75                         if ((c >= 'A') && (c <= 'F'))
  76                                 return (byte) (c - 'A' + 10);
  77                         if ((c >= '0') && (c <= '9'))
  78                                 return (byte) (c - '0');
  79                         throw new ArgumentException ("invalid hex char");
  80                 }
  81
  82                 public void FromXml (SecurityElement e, PolicyLevel level)
  83                 {
  84                         if (e == null)
  85                                 throw new ArgumentNullException ("e");
  86                         if (e.Tag != "IMembershipCondition")
  87                                 throw new ArgumentException ("Not IMembershipCondition", "e");
  88                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
  89                         string cert = e.Attribute ("X509Certificate");
  90                         if (cert != null) {
  91                                 byte[] rawcert = new byte [cert.Length >> 1];
  92                                 int n = 0;
  93                                 int i = 0;
  94                                 while (n < rawcert.Length) {
  95                                         rawcert [n] = (byte) (FromHexChar (cert[i++]) << 4);
  96                                         rawcert [n++] += FromHexChar (cert[i++]);
  97                                 }
  98                                 x509 = new X509Certificate (rawcert);
  99                         }
 100                 }
 101
 102                 public override int GetHashCode ()
 103                 {
 104                         return x509.GetHashCode ();
 105                 }
 106
 107                 public override string ToString ()
 108                 {
 109                         return "Publisher - " + x509.GetPublicKeyString ();
 110                 }
 111
 112                 // snippet moved from FileIOPermission (nickd) to be reused in all derived classes
 113                 internal SecurityElement Element (object o, int version)
 114                 {
 115                         SecurityElement se = new SecurityElement ("IMembershipCondition");
 116                         Type type = this.GetType ();
 117                         StringBuilder asmName = new StringBuilder (type.Assembly.ToString ());
 118                         asmName.Replace ('\"', '\'');
 119                         se.AddAttribute ("class", type.FullName + ", " + asmName);
 120                         se.AddAttribute ("version", version.ToString ());
 121                         return se;
 122                 }
 123
 124                 public SecurityElement ToXml ()
 125                 {
 126                         return ToXml (null);
 127                 }
 128
 129                 public SecurityElement ToXml (PolicyLevel level)
 130                 {
 131                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 132                         SecurityElement se = Element (this, 1);
 133                         se.AddAttribute ("X509Certificate", x509.GetRawCertDataString ());
 134                         return se;
 135                 }
 136         }
 137 }