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) 2004-2005 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.Collections;
  32 using System.Globalization;
  33 using System.Security.Permissions;
  34 using System.Runtime.InteropServices;
  35 using System.Text;
  36
  37 namespace System.Security.Policy {
  38
  39         [Serializable]
  40         [ComVisible (true)]
  41         public sealed class StrongNameMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  42
  43                 private readonly int version = 1;
  44
  45                 private StrongNamePublicKeyBlob blob;
  46                 private string name;
  47                 private Version assemblyVersion;
  48
  49                 public StrongNameMembershipCondition (StrongNamePublicKeyBlob blob, string name, Version version)
  50                 {
  51                         if (blob == null)
  52                                 throw new ArgumentNullException ("blob");
  53
  54                         this.blob = blob;
  55                         this.name = name;
  56                         if (version != null)
  57                                 assemblyVersion = (Version) version.Clone ();
  58                 }
  59
  60                 // for PolicyLevel (to avoid validation duplication)
  61                 internal StrongNameMembershipCondition (SecurityElement e)
  62                 {
  63                         FromXml (e);
  64                 }
  65
  66                 // so System.Activator.CreateInstance can create an instance...
  67                 internal StrongNameMembershipCondition ()
  68                 {
  69                 }
  70
  71                 // properties
  72
  73                 public string Name {
  74                         get { return name; }
  75                         set { name = value; }
  76                 }
  77
  78                 public Version Version {
  79                         get { return assemblyVersion; }
  80                         set { assemblyVersion = value; }
  81                 }
  82
  83                 public StrongNamePublicKeyBlob PublicKey {
  84                         get { return blob; }
  85                         set {
  86                                 if (value == null)
  87                                         throw new ArgumentNullException ("PublicKey");
  88                                 blob = value;
  89                         }
  90                 }
  91
  92                 public bool Check (Evidence evidence)
  93                 {
  94                         if (evidence == null)
  95                                 return false;
  96
  97                         IEnumerator e = evidence.GetHostEnumerator ();
  98                         while (e.MoveNext ()) {
  99                                 StrongName sn = (e.Current as StrongName);
 100                                 if (sn != null) {
 101                                         if (!sn.PublicKey.Equals (blob))
 102                                                 return false;
 103                                         if ((name != null) && (name != sn.Name))
 104                                                 return false;
 105                                         if ((assemblyVersion != null) && !assemblyVersion.Equals (sn.Version))
 106                                                 return false;
 107                                         return true;
 108                                 }
 109                         }
 110                         return false;
 111                 }
 112
 113                 public IMembershipCondition Copy ()
 114                 {
 115                         return new StrongNameMembershipCondition (blob, name, assemblyVersion);
 116                 }
 117
 118                 public override bool Equals (object o)
 119                 {
 120                         StrongNameMembershipCondition snmc = (o as StrongNameMembershipCondition);
 121                         if (snmc == null)
 122                                 return false;
 123                         if (!snmc.PublicKey.Equals (PublicKey))
 124                                 return false;
 125                         if (name != snmc.Name)
 126                                 return false;
 127                         if (assemblyVersion != null)
 128                                 return assemblyVersion.Equals (snmc.Version);
 129                         return (snmc.Version == null);
 130                 }
 131
 132                 public override int GetHashCode ()
 133                 {
 134                         // name and version aren't part of the calculation
 135                         return blob.GetHashCode ();
 136                 }
 137
 138                 public void FromXml (SecurityElement e)
 139                 {
 140                         FromXml (e, null);
 141                 }
 142
 143                 public void FromXml (SecurityElement e, PolicyLevel level)
 144                 {
 145                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 146
 147                         blob = StrongNamePublicKeyBlob.FromString (e.Attribute ("PublicKeyBlob"));
 148                         name = e.Attribute ("Name");
 149                         string v = (string) e.Attribute ("AssemblyVersion");
 150                         if (v == null)
 151                                 assemblyVersion = null;
 152                         else
 153                                 assemblyVersion = new Version (v);
 154                 }
 155
 156                 public override string ToString ()
 157                 {
 158                         StringBuilder sb = new StringBuilder ("StrongName - ");
 159                         sb.Append (blob);
 160                         if (name != null)
 161                                 sb.AppendFormat (" name = {0}", name);
 162                         if (assemblyVersion != null)
 163                                 sb.AppendFormat (" version = {0}", assemblyVersion);
 164                         return sb.ToString ();
 165                 }
 166
 167                 public SecurityElement ToXml ()
 168                 {
 169                         return ToXml (null);
 170                 }
 171
 172                 public SecurityElement ToXml (PolicyLevel level)
 173                 {
 174                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 175                         SecurityElement se = MembershipConditionHelper.Element (typeof (StrongNameMembershipCondition), version);
 176
 177                         if (blob != null)
 178                                 se.AddAttribute ("PublicKeyBlob", blob.ToString ());
 179                         if (name != null)
 180                                 se.AddAttribute ("Name", name);
 181                         if (assemblyVersion != null) {
 182                                 string v = assemblyVersion.ToString ();
 183                                 if (v != "0.0")
 184                                         se.AddAttribute ("AssemblyVersion", v);
 185                         }
 186                         return se;
 187                 }
 188         }
 189 }