mcs/class/corlib/System.Security.Permissions/PermissionSetAttribute.cs

   1 //
   2 // System.Security.Permissions.PermissionSetAttribute.cs
   3 //
   4 // Authors
   5 //      Duncan Mak <duncan@ximian.com>
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2002 Ximian, Inc. http://www.ximian.com
   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.IO;
  32 using System.Runtime.InteropServices;
  33 using System.Security.Policy;
  34 using System.Text;
  35
  36 using Mono.Security.Cryptography;
  37 using Mono.Xml;
  38
  39 namespace System.Security.Permissions {
  40
  41         [ComVisible (true)]
  42         [AttributeUsage (AttributeTargets.Assembly | AttributeTargets.Class |
  43                          AttributeTargets.Struct | AttributeTargets.Constructor |
  44                          AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
  45         [Serializable]
  46         public sealed class PermissionSetAttribute : CodeAccessSecurityAttribute {
  47
  48                 // Fields
  49                 private string file;
  50                 private string name;
  51                 private bool isUnicodeEncoded;
  52                 private string xml;
  53                 private string hex;
  54
  55                 // Constructor
  56                 public PermissionSetAttribute (SecurityAction action)
  57                         : base (action)
  58                 {
  59                 }
  60
  61                 // Properties
  62                 public string File {
  63                         get { return file; }
  64                         set { file = value; }
  65                 }
  66                 public string Hex {
  67                         get { return hex; }
  68                         set { hex = value; }
  69                 }
  70                 public string Name {
  71                         get { return name; }
  72                         set { name = value; }
  73                 }
  74
  75                 public bool UnicodeEncoded {
  76                         get { return isUnicodeEncoded; }
  77                         set { isUnicodeEncoded = value; }
  78                 }
  79
  80                 public string XML {
  81                         get { return xml; }
  82                         set { xml = value; }
  83                 }
  84
  85                 // Methods
  86                 public override IPermission CreatePermission ()
  87                 {
  88                         return null;      // Not used, used for inheritance from SecurityAttribute
  89                 }
  90
  91                 private PermissionSet CreateFromXml (string xml)
  92                 {
  93 #if !MOBILE
  94                         SecurityParser sp = new SecurityParser ();
  95                         try {
  96                                 sp.LoadXml (xml);
  97                         }
  98                         catch (Mono.Xml.SmallXmlParserException xe) {
  99                                 throw new XmlSyntaxException (xe.Line, xe.ToString ());
 100                         }
 101                         SecurityElement se = sp.ToXml ();
 102
 103                         string className = se.Attribute ("class");
 104                         if (className == null)
 105                                 return null;
 106
 107                         PermissionState state = PermissionState.None;
 108                         if (CodeAccessPermission.IsUnrestricted (se))
 109                                 state = PermissionState.Unrestricted;
 110
 111                         if (className.EndsWith ("NamedPermissionSet")) {
 112                                 NamedPermissionSet nps = new NamedPermissionSet (se.Attribute ("Name"), state);
 113                                 nps.FromXml (se);
 114                                 return (PermissionSet) nps;
 115                         }
 116                         else if (className.EndsWith ("PermissionSet")) {
 117                                 PermissionSet ps = new PermissionSet (state);
 118                                 ps.FromXml (se);
 119                                 return ps;
 120                         }
 121 #endif
 122                         return null;
 123                 }
 124
 125                 public PermissionSet CreatePermissionSet ()
 126                 {
 127                         PermissionSet pset = null;
 128 #if !MOBILE
 129                         if (this.Unrestricted)
 130                                 pset = new PermissionSet (PermissionState.Unrestricted);
 131                         else {
 132                                 pset = new PermissionSet (PermissionState.None);
 133                                 if (name != null) {
 134                                         return PolicyLevel.CreateAppDomainLevel ().GetNamedPermissionSet (name);
 135                                 }
 136                                 else if (file != null) {
 137                                         Encoding e = ((isUnicodeEncoded) ? System.Text.Encoding.Unicode : System.Text.Encoding.ASCII);
 138                                         using (StreamReader sr = new StreamReader (file, e)) {
 139                                                 pset = CreateFromXml (sr.ReadToEnd ());
 140                                         }
 141                                 }
 142                                 else if (xml != null) {
 143                                         pset = CreateFromXml (xml);
 144                                 }
 145                                 else if (hex != null) {
 146                                         // Unicode isn't supported
 147                                         //Encoding e = ((isUnicodeEncoded) ? System.Text.Encoding.Unicode : System.Text.Encoding.ASCII);
 148                                         Encoding e = System.Text.Encoding.ASCII;
 149                                         byte[] bin = CryptoConvert.FromHex (hex);
 150                                         pset = CreateFromXml (e.GetString (bin, 0, bin.Length));
 151                                 }
 152                         }
 153 #endif
 154                         return pset;
 155                 }
 156         }
 157 }