mcs/class/corlib/System.Security.Policy/FileCodeGroup.cs

   1 //
   2 // System.Security.Policy.FileCodeGroup
   3 //
   4 // Author(s):
   5 //   Nick Drochak (ndrochak@gol.com)
   6 //
   7 // (C) 2001 Nick Drochak, All rights reserved.
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Collections;
  31 using System.Runtime.InteropServices;
  32 using System.Security.Permissions;
  33
  34 namespace System.Security.Policy {
  35
  36         [Serializable]
  37         public sealed class FileCodeGroup : CodeGroup {
  38
  39                 private FileIOPermissionAccess m_access;
  40 #if NET_2_0
  41                 private CodeGroupGrantScope _scope = CodeGroupGrantScope.Assembly;
  42 #endif
  43
  44                 public FileCodeGroup (IMembershipCondition membershipCondition, FileIOPermissionAccess access)
  45                         : base (membershipCondition, null)
  46                 {
  47                         // note: FileIOPermissionAccess is a [Flag]
  48                         m_access = access;
  49                 }
  50
  51                 // for PolicyLevel (to avoid validation duplication)
  52                 internal FileCodeGroup (SecurityElement e, PolicyLevel level)
  53                         : base (e, level)
  54                 {
  55                 }
  56
  57                 public override CodeGroup Copy ()
  58                 {
  59                         FileCodeGroup copy = new FileCodeGroup (MembershipCondition, m_access);
  60                         copy.Name = this.Name;
  61                         copy.Description = this.Description;
  62                         foreach (CodeGroup child in Children) {
  63                                 copy.AddChild (child.Copy ());  // deep copy
  64                         }
  65                         return copy;
  66                 }
  67
  68                 public override string MergeLogic {
  69                         get { return "Union";}
  70                 }
  71
  72                 public override PolicyStatement Resolve (Evidence evidence)
  73                 {
  74                         if (null == evidence)
  75                                 throw new ArgumentNullException("evidence");
  76
  77                         if (!MembershipCondition.Check (evidence))
  78                                 return null;
  79
  80                         PolicyStatement pst = null;
  81                         if (this.PolicyStatement != null)
  82                                 pst = this.PolicyStatement.Copy ();
  83                         else
  84                                 pst = PolicyStatement.Empty ();
  85
  86                         if (this.Children.Count > 0) {
  87                                 foreach (CodeGroup child_cg in this.Children) {
  88                                         PolicyStatement child_pst = child_cg.Resolve (evidence);
  89                                         if (child_pst != null) {
  90                                                 foreach (IPermission perm in child_pst.PermissionSet) {
  91                                                         pst.PermissionSet.AddPermission (perm);
  92                                                 }
  93                                         }
  94                                 }
  95                         }
  96                         return pst;
  97                 }
  98
  99                 public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
 100                 {
 101                         if (null == evidence)
 102                                 throw new ArgumentNullException("evidence");
 103
 104                         if (!MembershipCondition.Check (evidence))
 105                                 return null;
 106
 107                         FileCodeGroup matchRoot = new FileCodeGroup (MembershipCondition, m_access);
 108
 109                         foreach (CodeGroup child in Children) {
 110                                 CodeGroup childMatchingCodeGroup = child.ResolveMatchingCodeGroups (evidence);
 111                                 if (childMatchingCodeGroup != null)
 112                                         matchRoot.AddChild (childMatchingCodeGroup);
 113                         }
 114
 115                         return matchRoot;
 116                 }
 117
 118                 public override string AttributeString {
 119                         get { return null; }
 120                 }
 121
 122                 public override string PermissionSetName {
 123                         get { return "Same directory FileIO - " + m_access.ToString (); }
 124                 }
 125
 126 #if NET_2_0
 127                 [ComVisible (false)]
 128                 public CodeGroupGrantScope Scope {
 129                         get { return _scope; }
 130                         set { _scope = value; }
 131                 }
 132 #endif
 133
 134                 public override bool Equals (object o)
 135                 {
 136                         if (!(o is FileCodeGroup))
 137                                 return false;
 138
 139                         if (this.m_access != ((FileCodeGroup)o).m_access)
 140                                 return false;
 141
 142                         return Equals((CodeGroup)o, false);
 143                 }
 144
 145                 public override int GetHashCode ()
 146                 {
 147                         return m_access.GetHashCode ();
 148                 }
 149
 150                 protected override void ParseXml (SecurityElement e, PolicyLevel level)
 151                 {
 152                         string a = e.Attribute ("Access");
 153                         if (a != null)
 154                                 m_access = (FileIOPermissionAccess) Enum.Parse (typeof (FileIOPermissionAccess), a, true);
 155                         else
 156                                 m_access = FileIOPermissionAccess.NoAccess;
 157                 }
 158
 159                 protected override void CreateXml (SecurityElement element, PolicyLevel level)
 160                 {
 161                         element.AddAttribute ("Access", m_access.ToString ());
 162                 }
 163         }
 164 }