mcs/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
  35 namespace System.Security {
  36
  37         // Must match MonoDeclSecurityEntry in /mono/metadata/reflection.h
  38         internal struct RuntimeDeclSecurityEntry {
  39                 public IntPtr blob;
  40                 public int size;
  41                 public int index;
  42         }
  43
  44         // Must match MonoSecurityFrame in /mono/mini/declsec.h
  45         internal class RuntimeSecurityFrame {
  46                 public AppDomain domain;
  47                 public MethodInfo method;
  48                 public RuntimeDeclSecurityEntry assert;
  49                 public RuntimeDeclSecurityEntry deny;
  50                 public RuntimeDeclSecurityEntry permitonly;
  51         }
  52
  53         internal struct SecurityFrame {
  54
  55                 private AppDomain _domain;
  56                 private MethodInfo _method;
  57                 private PermissionSet _assert;
  58                 private PermissionSet _deny;
  59                 private PermissionSet _permitonly;
  60
  61                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  62                 extern static RuntimeSecurityFrame _GetSecurityFrame (int skip);
  63
  64                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  65                 extern static Array _GetSecurityStack (int skip);
  66
  67                 internal SecurityFrame (RuntimeSecurityFrame frame)
  68                 {
  69                         _domain = null;
  70                         _method = null;
  71                         _assert = null;
  72                         _deny = null;
  73                         _permitonly = null;
  74                         InitFromRuntimeFrame (frame);
  75                 }
  76
  77                 internal SecurityFrame (int skip)
  78                 {
  79                         _domain = null;
  80                         _method = null;
  81                         _assert = null;
  82                         _deny = null;
  83                         _permitonly = null;
  84
  85                         InitFromRuntimeFrame (_GetSecurityFrame (skip + 2));
  86
  87                         // TODO - add the imperative informations into the frame
  88                 }
  89
  90                 // Note: SecurityManager.Decode implements a cache - so not every call
  91                 // ends up making an icall
  92                 internal void InitFromRuntimeFrame (RuntimeSecurityFrame frame)
  93                 {
  94                         _domain = frame.domain;
  95                         _method = frame.method;
  96
  97                         if (frame.assert.size > 0) {
  98                                 _assert = SecurityManager.Decode (frame.assert.blob, frame.assert.size);
  99                         }
 100                         if (frame.deny.size > 0) {
 101                                 _deny = SecurityManager.Decode (frame.deny.blob, frame.deny.size);
 102                         }
 103                         if (frame.permitonly.size > 0) {
 104                                 _permitonly = SecurityManager.Decode (frame.permitonly.blob, frame.permitonly.size);
 105                         }
 106                 }
 107
 108                 public Assembly Assembly {
 109                         get { return _method.ReflectedType.Assembly; }
 110                 }
 111
 112                 public AppDomain Domain {
 113                         get { return _domain; }
 114                 }
 115
 116                 public MethodInfo Method {
 117                         get { return _method; }
 118                 }
 119
 120                 public PermissionSet Assert {
 121                         get { return _assert; }
 122                 }
 123
 124                 public PermissionSet Deny {
 125                         get { return _deny; }
 126                 }
 127
 128                 public PermissionSet PermitOnly {
 129                         get { return _permitonly; }
 130                 }
 131
 132                 public bool HasStackModifiers {
 133                         get { return ((_assert != null) || (_deny != null) || (_permitonly != null)); }
 134                 }
 135
 136                 public bool Equals (SecurityFrame sf)
 137                 {
 138                         if (!Object.ReferenceEquals (_domain, sf.Domain))
 139                                 return false;
 140                         if (Assembly.ToString () != sf.Assembly.ToString ())
 141                                 return false;
 142                         if (Method.ToString () != sf.Method.ToString ())
 143                                 return false;
 144
 145                         if ((_assert != null) && !_assert.Equals (sf.Assert))
 146                                 return false;
 147                         if ((_deny != null) && !_deny.Equals (sf.Deny))
 148                                 return false;
 149                         if ((_permitonly != null) && !_permitonly.Equals (sf.PermitOnly))
 150                                 return false;
 151
 152                         return true;
 153                 }
 154
 155                 static public ArrayList GetStack (int skipFrames)
 156                 {
 157                         Array stack = _GetSecurityStack (skipFrames+2);
 158                         ArrayList al = new ArrayList ();
 159                         for (int i = 0; i < stack.Length; i++) {
 160                                 object o = stack.GetValue (i);
 161                                 // null are unused slots allocated in the runtime
 162                                 if (o == null)
 163                                         break;
 164                                 al.Add (new SecurityFrame ((RuntimeSecurityFrame)o));
 165                         }
 166                         return al;
 167                 }
 168         }
 169 }