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) 2004-2005 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 #if NET_2_0
  41         [ComVisible (true)]
  42 #endif
  43         public sealed class StrongNameMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  44
  45                 private readonly int version = 1;
  46
  47                 private StrongNamePublicKeyBlob blob;
  48                 private string name;
  49                 private Version assemblyVersion;
  50
  51                 public StrongNameMembershipCondition (StrongNamePublicKeyBlob blob, string name, Version version)
  52                 {
  53                         if (blob == null)
  54                                 throw new ArgumentNullException ("blob");
  55
  56                         this.blob = blob;
  57                         this.name = name;
  58                         if (version != null)
  59                                 assemblyVersion = (Version) version.Clone ();
  60                 }
  61
  62                 // for PolicyLevel (to avoid validation duplication)
  63                 internal StrongNameMembershipCondition (SecurityElement e)
  64                 {
  65                         FromXml (e);
  66                 }
  67
  68                 // so System.Activator.CreateInstance can create an instance...
  69                 internal StrongNameMembershipCondition ()
  70                 {
  71                 }
  72
  73                 // properties
  74
  75                 public string Name {
  76                         get { return name; }
  77                         set { name = value; }
  78                 }
  79
  80                 public Version Version {
  81                         get { return assemblyVersion; }
  82                         set { assemblyVersion = value; }
  83                 }
  84
  85                 public StrongNamePublicKeyBlob PublicKey {
  86                         get { return blob; }
  87                         set {
  88                                 if (value == null)
  89                                         throw new ArgumentNullException ("PublicKey");
  90                                 blob = value;
  91                         }
  92                 }
  93
  94                 public bool Check (Evidence evidence)
  95                 {
  96                         if (evidence == null)
  97                                 return false;
  98
  99                         IEnumerator e = evidence.GetHostEnumerator ();
 100                         while (e.MoveNext ()) {
 101                                 StrongName sn = (e.Current as StrongName);
 102                                 if (sn != null) {
 103                                         if (!sn.PublicKey.Equals (blob))
 104                                                 return false;
 105                                         if ((name != null) && (name != sn.Name))
 106                                                 return false;
 107                                         if ((assemblyVersion != null) && !assemblyVersion.Equals (sn.Version))
 108                                                 return false;
 109                                         return true;
 110                                 }
 111                         }
 112                         return false;
 113                 }
 114
 115                 public IMembershipCondition Copy ()
 116                 {
 117                         return new StrongNameMembershipCondition (blob, name, assemblyVersion);
 118                 }
 119
 120                 public override bool Equals (object o)
 121                 {
 122                         StrongNameMembershipCondition snmc = (o as StrongNameMembershipCondition);
 123                         if (snmc == null)
 124                                 return false;
 125                         if (!snmc.PublicKey.Equals (PublicKey))
 126                                 return false;
 127                         if (name != snmc.Name)
 128                                 return false;
 129                         if (assemblyVersion != null)
 130                                 return assemblyVersion.Equals (snmc.Version);
 131                         return (snmc.Version == null);
 132                 }
 133
 134                 public override int GetHashCode ()
 135                 {
 136                         // name and version aren't part of the calculation
 137                         return blob.GetHashCode ();
 138                 }
 139
 140                 public void FromXml (SecurityElement e)
 141                 {
 142                         FromXml (e, null);
 143                 }
 144
 145                 public void FromXml (SecurityElement e, PolicyLevel level)
 146                 {
 147                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 148
 149                         blob = StrongNamePublicKeyBlob.FromString (e.Attribute ("PublicKeyBlob"));
 150                         name = e.Attribute ("Name");
 151                         string v = (string) e.Attribute ("AssemblyVersion");
 152                         if (v == null)
 153                                 assemblyVersion = null;
 154                         else
 155                                 assemblyVersion = new Version (v);
 156                 }
 157
 158                 public override string ToString ()
 159                 {
 160                         StringBuilder sb = new StringBuilder ("StrongName - ");
 161                         sb.Append (blob);
 162                         if (name != null)
 163                                 sb.AppendFormat (" name = {0}", name);
 164                         if (assemblyVersion != null)
 165                                 sb.AppendFormat (" version = {0}", assemblyVersion);
 166                         return sb.ToString ();
 167                 }
 168
 169                 public SecurityElement ToXml ()
 170                 {
 171                         return ToXml (null);
 172                 }
 173
 174                 public SecurityElement ToXml (PolicyLevel level)
 175                 {
 176                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 177                         SecurityElement se = MembershipConditionHelper.Element (typeof (StrongNameMembershipCondition), version);
 178
 179                         if (blob != null)
 180                                 se.AddAttribute ("PublicKeyBlob", blob.ToString ());
 181                         if (name != null)
 182                                 se.AddAttribute ("Name", name);
 183                         if (assemblyVersion != null) {
 184                                 string v = assemblyVersion.ToString ();
 185                                 if (v != "0.0")
 186                                         se.AddAttribute ("AssemblyVersion", v);
 187                         }
 188                         return se;
 189                 }
 190         }
 191 }