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         internal struct SecurityFrame {
  57
  58                 private AppDomain _domain;
  59                 private MethodInfo _method;
  60                 private PermissionSet _assert;
  61                 private PermissionSet _deny;
  62                 private PermissionSet _permitonly;
  63
  64                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  65                 extern static RuntimeSecurityFrame _GetSecurityFrame (int skip);
  66
  67                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
  68                 extern static Array _GetSecurityStack (int skip);
  69
  70                 internal SecurityFrame (RuntimeSecurityFrame frame)
  71                 {
  72                         _domain = null;
  73                         _method = null;
  74                         _assert = null;
  75                         _deny = null;
  76                         _permitonly = null;
  77                         InitFromRuntimeFrame (frame);
  78                 }
  79
  80                 internal SecurityFrame (int skip)
  81                 {
  82                         _domain = null;
  83                         _method = null;
  84                         _assert = null;
  85                         _deny = null;
  86                         _permitonly = null;
  87
  88                         InitFromRuntimeFrame (_GetSecurityFrame (skip + 2));
  89
  90                         // TODO - add the imperative informations into the frame
  91                 }
  92
  93                 // Note: SecurityManager.Decode implements a cache - so not every call
  94                 // ends up making an icall
  95                 internal void InitFromRuntimeFrame (RuntimeSecurityFrame frame)
  96                 {
  97                         _domain = frame.domain;
  98                         _method = frame.method;
  99
 100                         if (frame.assert.size > 0) {
 101                                 _assert = SecurityManager.Decode (frame.assert.blob, frame.assert.size);
 102                         }
 103                         if (frame.deny.size > 0) {
 104                                 _deny = SecurityManager.Decode (frame.deny.blob, frame.deny.size);
 105                         }
 106                         if (frame.permitonly.size > 0) {
 107                                 _permitonly = SecurityManager.Decode (frame.permitonly.blob, frame.permitonly.size);
 108                         }
 109                 }
 110
 111                 public Assembly Assembly {
 112                         get { return _method.ReflectedType.Assembly; }
 113                 }
 114
 115                 public AppDomain Domain {
 116                         get { return _domain; }
 117                 }
 118
 119                 public MethodInfo Method {
 120                         get { return _method; }
 121                 }
 122
 123                 public PermissionSet Assert {
 124                         get { return _assert; }
 125                 }
 126
 127                 public PermissionSet Deny {
 128                         get { return _deny; }
 129                 }
 130
 131                 public PermissionSet PermitOnly {
 132                         get { return _permitonly; }
 133                 }
 134
 135                 public bool HasStackModifiers {
 136                         get { return ((_assert != null) || (_deny != null) || (_permitonly != null)); }
 137                 }
 138
 139                 public bool Equals (SecurityFrame sf)
 140                 {
 141                         if (!Object.ReferenceEquals (_domain, sf.Domain))
 142                                 return false;
 143                         if (Assembly.ToString () != sf.Assembly.ToString ())
 144                                 return false;
 145                         if (Method.ToString () != sf.Method.ToString ())
 146                                 return false;
 147
 148                         if ((_assert != null) && !_assert.Equals (sf.Assert))
 149                                 return false;
 150                         if ((_deny != null) && !_deny.Equals (sf.Deny))
 151                                 return false;
 152                         if ((_permitonly != null) && !_permitonly.Equals (sf.PermitOnly))
 153                                 return false;
 154
 155                         return true;
 156                 }
 157
 158                 public override string ToString ()
 159                 {
 160                         StringBuilder sb = new StringBuilder ();
 161                         sb.AppendFormat ("Frame: {0}{1}", _method, Environment.NewLine);
 162                         sb.AppendFormat ("\tAppDomain: {0}{1}", Domain, Environment.NewLine);
 163                         sb.AppendFormat ("\tAssembly: {0}{1}", Assembly, Environment.NewLine);
 164                         if (_assert != null)
 165                                 sb.AppendFormat ("\tAssert: {0}{1}", _assert, Environment.NewLine);
 166                         if (_deny != null)
 167                                 sb.AppendFormat ("\tDeny: {0}{1}", _deny, Environment.NewLine);
 168                         if (_permitonly != null)
 169                                 sb.AppendFormat ("\tPermitOnly: {0}{1}", _permitonly, Environment.NewLine);
 170                         return sb.ToString ();
 171                 }
 172
 173                 static public ArrayList GetStack (int skipFrames)
 174                 {
 175                         Array stack = _GetSecurityStack (skipFrames+2);
 176                         ArrayList al = new ArrayList ();
 177                         for (int i = 0; i < stack.Length; i++) {
 178                                 object o = stack.GetValue (i);
 179                                 // null are unused slots allocated in the runtime
 180                                 if (o == null)
 181                                         break;
 182                                 al.Add (new SecurityFrame ((RuntimeSecurityFrame)o));
 183                         }
 184                         return al;
 185                 }
 186         }
 187 }