class/corlib/System.Security.Permissions/KeyContainerPermission.cs

   1 //
   2 // System.Security.Permissions.KeyContainerPermission.cs
   3 //
   4 // Author
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004-2005 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.Globalization;
  30 using System.Runtime.InteropServices;
  31
  32 namespace System.Security.Permissions {
  33
  34         [Serializable]
  35         [ComVisible (true)]
  36         public sealed class KeyContainerPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
  37
  38                 private KeyContainerPermissionAccessEntryCollection _accessEntries;
  39                 private KeyContainerPermissionFlags _flags;
  40
  41                 private const int version = 1;
  42
  43                 // Constructors
  44
  45                 public KeyContainerPermission (PermissionState state)
  46                 {
  47                         if (CheckPermissionState (state, true) == PermissionState.Unrestricted) {
  48                                 _flags = KeyContainerPermissionFlags.AllFlags;
  49                         }
  50                 }
  51
  52                 public KeyContainerPermission (KeyContainerPermissionFlags flags)
  53                 {
  54                         SetFlags (flags);
  55                 }
  56
  57                 public KeyContainerPermission (KeyContainerPermissionFlags flags, KeyContainerPermissionAccessEntry[] accessList)
  58                 {
  59                         SetFlags (flags);
  60                         if (accessList != null) {
  61                                 foreach (KeyContainerPermissionAccessEntry kcpae in accessList) {
  62                                         _accessEntries.Add (kcpae);
  63                                 }
  64                         }
  65                 }
  66
  67                 // Properties
  68
  69                 public KeyContainerPermissionAccessEntryCollection AccessEntries {
  70                         get { return _accessEntries; }
  71                 }
  72
  73                 public KeyContainerPermissionFlags Flags {
  74                         get { return _flags; }
  75                 }
  76
  77                 // Methods
  78
  79                 public override IPermission Copy ()
  80                 {
  81                         if (_accessEntries.Count == 0)
  82                                 return new KeyContainerPermission (_flags);
  83
  84                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [_accessEntries.Count];
  85                         _accessEntries.CopyTo (list, 0);
  86                         return new KeyContainerPermission (_flags, list);
  87                 }
  88
  89                 [MonoTODO ("(2.0) missing support for AccessEntries")]
  90                 public override void FromXml (SecurityElement securityElement)
  91                 {
  92                         // General validation in CodeAccessPermission
  93                         CheckSecurityElement (securityElement, "securityElement", version, version);
  94                         // Note: we do not (yet) care about the return value
  95                         // as we only accept version 1 (min/max values)
  96
  97                         if (IsUnrestricted (securityElement)) {
  98                                 _flags = KeyContainerPermissionFlags.AllFlags;
  99                         }
 100                         else {
 101                                 // ???
 102                                 _flags = (KeyContainerPermissionFlags) Enum.Parse (
 103                                         typeof (KeyContainerPermissionFlags), securityElement.Attribute ("Flags"));
 104                         }
 105                 }
 106
 107                 [MonoTODO ("(2.0)")]
 108                 public override IPermission Intersect (IPermission target)
 109                 {
 110                         return null;
 111                 }
 112
 113                 [MonoTODO ("(2.0)")]
 114                 public override bool IsSubsetOf (IPermission target)
 115                 {
 116                         return false;
 117                 }
 118
 119                 public bool IsUnrestricted ()
 120                 {
 121                         return (_flags == KeyContainerPermissionFlags.AllFlags);
 122                 }
 123
 124                 [MonoTODO ("(2.0) missing support for AccessEntries")]
 125                 public override SecurityElement ToXml ()
 126                 {
 127                         SecurityElement e = Element (version);
 128                         if (IsUnrestricted ()) {
 129                                 e.AddAttribute ("Unrestricted", "true");
 130                         } else {
 131                                 // ...
 132                         }
 133                         return e;
 134                 }
 135
 136                 public override IPermission Union (IPermission target)
 137                 {
 138                         KeyContainerPermission kcp = Cast (target);
 139                         if (kcp == null)
 140                                 return Copy ();
 141
 142                         KeyContainerPermissionAccessEntryCollection kcpaec = new KeyContainerPermissionAccessEntryCollection ();
 143                         // copy first group
 144                         foreach (KeyContainerPermissionAccessEntry kcpae in _accessEntries) {
 145                                 kcpaec.Add (kcpae);
 146                         }
 147                         // copy second group...
 148                         foreach (KeyContainerPermissionAccessEntry kcpae in kcp._accessEntries) {
 149                                 // ... but only if not present in first group
 150                                 if (_accessEntries.IndexOf (kcpae) == -1)
 151                                         kcpaec.Add (kcpae);
 152                         }
 153
 154                         if (kcpaec.Count == 0)
 155                                 return new KeyContainerPermission ((_flags | kcp._flags));
 156
 157                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [kcpaec.Count];
 158                         kcpaec.CopyTo (list, 0);
 159                         return new KeyContainerPermission ((_flags | kcp._flags), list);
 160                 }
 161
 162                 // IBuiltInPermission
 163                 int IBuiltInPermission.GetTokenIndex ()
 164                 {
 165                         return (int) BuiltInToken.KeyContainer;
 166                 }
 167
 168                 // helpers
 169
 170                 private void SetFlags (KeyContainerPermissionFlags flags)
 171                 {
 172                         if ((flags & KeyContainerPermissionFlags.AllFlags) != 0) {
 173                                 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), flags);
 174                                 throw new ArgumentException (msg, "KeyContainerPermissionFlags");
 175                         }
 176                         _flags = flags;
 177                 }
 178
 179                 private KeyContainerPermission Cast (IPermission target)
 180                 {
 181                         if (target == null)
 182                                 return null;
 183
 184                         KeyContainerPermission kcp = (target as KeyContainerPermission);
 185                         if (kcp == null) {
 186                                 ThrowInvalidPermission (target, typeof (KeyContainerPermission));
 187                         }
 188
 189                         return kcp;
 190                 }
 191         }
 192 }
 193