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

   1 //
   2 // System.Security.Policy.StrongNameMembershipCondition.cs
   3 //
   4 // Author:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2003 Duncan Mak, Ximian Inc.
   9 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Globalization;
  32 using System.Security.Permissions;
  33
  34 namespace System.Security.Policy {
  35
  36         [Serializable]
  37         public sealed class StrongNameMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  38
  39                 private readonly int version = 1;
  40
  41                 private StrongNamePublicKeyBlob blob;
  42                 private string name;
  43                 private Version assemblyVersion;
  44
  45                 public StrongNameMembershipCondition (StrongNamePublicKeyBlob blob, string name, Version version)
  46                 {
  47                         if (blob == null)
  48                                 throw new ArgumentNullException ("blob");
  49
  50                         this.blob = blob;
  51                         this.name = name;
  52                         assemblyVersion = version;
  53                 }
  54
  55                 // for PolicyLevel (to avoid validation duplication)
  56                 internal StrongNameMembershipCondition (SecurityElement e)
  57                 {
  58                         FromXml (e);
  59                 }
  60
  61                 // so System.Activator.CreateInstance can create an instance...
  62                 internal StrongNameMembershipCondition ()
  63                 {
  64                 }
  65
  66                 // properties
  67
  68                 public string Name {
  69                         get { return name; }
  70                         set { name = value; }
  71                 }
  72
  73                 public Version Version {
  74                         get { return assemblyVersion; }
  75                         set { assemblyVersion = value; }
  76                 }
  77
  78                 public StrongNamePublicKeyBlob PublicKey {
  79                         get { return blob; }
  80                         set {
  81                                 if (value == null)
  82                                         throw new ArgumentNullException (
  83                                                 Locale.GetText ("The argument is null."));
  84                                 blob = value;
  85                         }
  86                 }
  87
  88                 public bool Check (Evidence evidence)
  89                 {
  90                         if (evidence == null)
  91                                 return false;
  92
  93                         foreach (object o in evidence) {
  94                                 if (o is StrongName) {
  95                                         StrongName sn = (o as StrongName);
  96                                         /* ??? partial match ??? */
  97                                         if (sn.PublicKey.Equals (blob) && (sn.Name == name) && (sn.Version.Equals (assemblyVersion)))
  98                                                 return true;
  99                                 }
 100                         }
 101                         return false;
 102                 }
 103
 104                 public IMembershipCondition Copy ()
 105                 {
 106                         return new StrongNameMembershipCondition (blob, name, assemblyVersion);
 107                 }
 108
 109                 public override bool Equals (object o)
 110                 {
 111                         if (o is StrongNameMembershipCondition == false)
 112                                 return false;
 113                         else {
 114                                 StrongNameMembershipCondition snmc = (StrongNameMembershipCondition) o;
 115                                 return (snmc.Name == Name && snmc.Version == Version && snmc.PublicKey == PublicKey);
 116                         }
 117                 }
 118
 119                 public override int GetHashCode ()
 120                 {
 121                         return blob.GetHashCode ();
 122                 }
 123
 124                 public void FromXml (SecurityElement e)
 125                 {
 126                         FromXml (e, null);
 127                 }
 128
 129                 public void FromXml (SecurityElement e, PolicyLevel level)
 130                 {
 131                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 132
 133                         blob = StrongNamePublicKeyBlob.FromString (e.Attribute ("PublicKeyBlob"));
 134                         name = e.Attribute ("Name");
 135                         string v = (string) e.Attribute ("AssemblyVersion");
 136                         if (v == null)
 137                                 assemblyVersion = new Version ();
 138                         else
 139                                 assemblyVersion = new Version (v);
 140                 }
 141
 142                 public override string ToString ()
 143                 {
 144                         // ??? missing informations ???
 145                         return String.Format ( "Strong Name - {0} name = {1} version {2}",
 146                                         blob, name, assemblyVersion);
 147                 }
 148
 149                 public SecurityElement ToXml ()
 150                 {
 151                         return ToXml (null);
 152                 }
 153
 154                 public SecurityElement ToXml (PolicyLevel level)
 155                 {
 156                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 157                         SecurityElement se = MembershipConditionHelper.Element (typeof (StrongNameMembershipCondition), version);
 158
 159                         if (blob != null)
 160                                 se.AddAttribute ("PublicKeyBlob", blob.ToString ());
 161                         if (name != null)
 162                                 se.AddAttribute ("Name", name);
 163                         if (assemblyVersion != null) {
 164                                 string v = assemblyVersion.ToString ();
 165                                 if (v != "0.0")
 166                                         se.AddAttribute ("AssemblyVersion", v);
 167                         }
 168                         return se;
 169                 }
 170         }
 171 }