class/corlib/System.Security/SecurityFrame.cs

   1 //
   2 // System.Security.SecurityFrame.cs
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.Collections;
  30 using System.Globalization;
  31 using System.Reflection;
  32 using System.Runtime.CompilerServices;
  33 using System.Security.Permissions;
  34 using System.Text;
  35
  36 namespace System.Security {
  37
  38         // Must match MonoDeclSecurityEntry in /mono/metadata/reflection.h
  39         internal struct RuntimeDeclSecurityEntry {
  40                 public IntPtr blob;
  41                 public int size;
  42                 public int index;
  43         }
  44
  45         // Must match MonoSecurityFrame in /mono/mini/declsec.h
  46 #pragma warning disable 649
  47         internal class RuntimeSecurityFrame {
  48                 public AppDomain domain;
  49                 public MethodInfo method;
  50                 public RuntimeDeclSecurityEntry assert;
  51                 public RuntimeDeclSecurityEntry deny;
  52                 public RuntimeDeclSecurityEntry permitonly;
  53         }
  54 #pragma warning restore 649
  55
  56 #if !MOONLIGHT
  57         internal struct SecurityFrame {
  58
  59                 private AppDomain _domain;
  60                 private MethodInfo _method;
  61                 private PermissionSet _assert;
  62                 private PermissionSet _deny;
  63                 private PermissionSet _permitonly;
  64
  65                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  66                 extern static RuntimeSecurityFrame _GetSecurityFrame (int skip);
  67
  68                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  69                 extern static Array _GetSecurityStack (int skip);
  70
  71                 internal SecurityFrame (RuntimeSecurityFrame frame)
  72                 {
  73                         _domain = null;
  74                         _method = null;
  75                         _assert = null;
  76                         _deny = null;
  77                         _permitonly = null;
  78                         InitFromRuntimeFrame (frame);
  79                 }
  80
  81                 internal SecurityFrame (int skip)
  82                 {
  83                         _domain = null;
  84                         _method = null;
  85                         _assert = null;
  86                         _deny = null;
  87                         _permitonly = null;
  88
  89                         InitFromRuntimeFrame (_GetSecurityFrame (skip + 2));
  90
  91                         // TODO - add the imperative informations into the frame
  92                 }
  93
  94                 // Note: SecurityManager.Decode implements a cache - so not every call
  95                 // ends up making an icall
  96                 internal void InitFromRuntimeFrame (RuntimeSecurityFrame frame)
  97                 {
  98                         _domain = frame.domain;
  99                         _method = frame.method;
 100
 101                         if (frame.assert.size > 0) {
 102                                 _assert = SecurityManager.Decode (frame.assert.blob, frame.assert.size);
 103                         }
 104                         if (frame.deny.size > 0) {
 105                                 _deny = SecurityManager.Decode (frame.deny.blob, frame.deny.size);
 106                         }
 107                         if (frame.permitonly.size > 0) {
 108                                 _permitonly = SecurityManager.Decode (frame.permitonly.blob, frame.permitonly.size);
 109                         }
 110                 }
 111
 112                 public Assembly Assembly {
 113                         get { return _method.ReflectedType.Assembly; }
 114                 }
 115
 116                 public AppDomain Domain {
 117                         get { return _domain; }
 118                 }
 119
 120                 public MethodInfo Method {
 121                         get { return _method; }
 122                 }
 123
 124                 public PermissionSet Assert {
 125                         get { return _assert; }
 126                 }
 127
 128                 public PermissionSet Deny {
 129                         get { return _deny; }
 130                 }
 131
 132                 public PermissionSet PermitOnly {
 133                         get { return _permitonly; }
 134                 }
 135
 136                 public bool HasStackModifiers {
 137                         get { return ((_assert != null) || (_deny != null) || (_permitonly != null)); }
 138                 }
 139
 140                 public bool Equals (SecurityFrame sf)
 141                 {
 142                         if (!Object.ReferenceEquals (_domain, sf.Domain))
 143                                 return false;
 144                         if (Assembly.ToString () != sf.Assembly.ToString ())
 145                                 return false;
 146                         if (Method.ToString () != sf.Method.ToString ())
 147                                 return false;
 148
 149                         if ((_assert != null) && !_assert.Equals (sf.Assert))
 150                                 return false;
 151                         if ((_deny != null) && !_deny.Equals (sf.Deny))
 152                                 return false;
 153                         if ((_permitonly != null) && !_permitonly.Equals (sf.PermitOnly))
 154                                 return false;
 155
 156                         return true;
 157                 }
 158
 159                 public override string ToString ()
 160                 {
 161                         StringBuilder sb = new StringBuilder ();
 162                         sb.AppendFormat ("Frame: {0}{1}", _method, Environment.NewLine);
 163                         sb.AppendFormat ("\tAppDomain: {0}{1}", Domain, Environment.NewLine);
 164                         sb.AppendFormat ("\tAssembly: {0}{1}", Assembly, Environment.NewLine);
 165                         if (_assert != null)
 166                                 sb.AppendFormat ("\tAssert: {0}{1}", _assert, Environment.NewLine);
 167                         if (_deny != null)
 168                                 sb.AppendFormat ("\tDeny: {0}{1}", _deny, Environment.NewLine);
 169                         if (_permitonly != null)
 170                                 sb.AppendFormat ("\tPermitOnly: {0}{1}", _permitonly, Environment.NewLine);
 171                         return sb.ToString ();
 172                 }
 173
 174                 static public ArrayList GetStack (int skipFrames)
 175                 {
 176                         Array stack = _GetSecurityStack (skipFrames+2);
 177                         ArrayList al = new ArrayList ();
 178                         for (int i = 0; i < stack.Length; i++) {
 179                                 object o = stack.GetValue (i);
 180                                 // null are unused slots allocated in the runtime
 181                                 if (o == null)
 182                                         break;
 183                                 al.Add (new SecurityFrame ((RuntimeSecurityFrame)o));
 184                         }
 185                         return al;
 186                 }
 187         }
 188 #endif
 189 }