2005-04-12 Dick Porter <dick@ximian.com>
[mono.git] / 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 MethodInfo method;
47                 public RuntimeDeclSecurityEntry assert;
48                 public RuntimeDeclSecurityEntry deny;
49                 public RuntimeDeclSecurityEntry permitonly;
50         }
51
52         internal struct SecurityFrame {
53
54                 private MethodInfo _method;
55                 private PermissionSet _assert;
56                 private PermissionSet _deny;
57                 private PermissionSet _permitonly;
58
59                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
60                 extern static RuntimeSecurityFrame _GetSecurityFrame (int skip);
61
62                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
63                 extern static Array _GetSecurityStack (int skip);
64
65                 internal SecurityFrame (RuntimeSecurityFrame frame)
66                 {
67                         _method = null;
68                         _assert = null;
69                         _deny = null;
70                         _permitonly = null;
71                         InitFromRuntimeFrame (frame);
72                 }
73
74                 internal SecurityFrame (int skip)
75                 {
76                         _method = null;
77                         _assert = null;
78                         _deny = null;
79                         _permitonly = null;
80
81                         InitFromRuntimeFrame (_GetSecurityFrame (skip + 2));
82
83                         // TODO - add the imperative informations into the frame
84                 }
85
86                 // Note: SecurityManager.Decode implements a cache - so not every call
87                 // ends up making an icall
88                 internal void InitFromRuntimeFrame (RuntimeSecurityFrame frame)
89                 {
90                         _method = frame.method;
91
92                         if (frame.assert.size > 0) {
93                                 _assert = SecurityManager.Decode (frame.assert.blob, frame.assert.size);
94                         }
95                         if (frame.deny.size > 0) {
96                                 _deny = SecurityManager.Decode (frame.deny.blob, frame.deny.size);
97                         }
98                         if (frame.permitonly.size > 0) {
99                                 _permitonly = SecurityManager.Decode (frame.permitonly.blob, frame.permitonly.size);
100                         }
101                 }
102
103                 public Assembly Assembly {
104                         get { return _method.ReflectedType.Assembly; }
105                 }
106
107                 public MethodInfo Method {
108                         get { return _method; }
109                 }
110
111                 public PermissionSet Assert {
112                         get { return _assert; }
113                 }
114
115                 public PermissionSet Deny {
116                         get { return _deny; }
117                 }
118
119                 public PermissionSet PermitOnly {
120                         get { return _permitonly; }
121                 }
122
123                 public bool HasStackModifiers {
124                         get { return ((_assert != null) || (_deny != null) || (_permitonly != null)); }
125                 }
126
127                 public bool Equals (SecurityFrame sf)
128                 {
129                         if (Assembly.ToString () != sf.Assembly.ToString ())
130                                 return false;
131                         if (Method.ToString () != sf.Method.ToString ())
132                                 return false;
133
134                         if ((_assert != null) && !_assert.Equals (sf.Assert))
135                                 return false;
136                         if ((_deny != null) && !_deny.Equals (sf.Deny))
137                                 return false;
138                         if ((_permitonly != null) && !_permitonly.Equals (sf.PermitOnly))
139                                 return false;
140
141                         return true;
142                 }
143
144                 static public ArrayList GetStack (int skipFrames)
145                 {
146                         Array stack = _GetSecurityStack (skipFrames+2);
147                         ArrayList al = new ArrayList (stack.Length);
148                         foreach (RuntimeSecurityFrame frame in stack) {
149                                 al.Add (new SecurityFrame (frame));
150                         }
151                         al.Reverse ();
152 #if false
153                         Console.WriteLine ("Stack Dump (skip {0})", skipFrames);
154                         int i=1;
155                         foreach (SecurityFrame f in al) {
156                                 Console.WriteLine ("\t{0}. {1}", i++, f.Method);
157                         }
158                         Console.WriteLine ("End Stack Dump");
159 #endif
160                         return al;
161                 }
162         }
163 }