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) 2004-2005 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 #if NET_2_0
  38         [ComVisible (true)]
  39 #endif
  40         public sealed class FileCodeGroup : CodeGroup {
  41
  42                 private FileIOPermissionAccess m_access;
  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                         PermissionSet ps = null;
  81                         if (this.PolicyStatement == null)
  82                                 ps = new PermissionSet (PermissionState.None);
  83                         else
  84                                 ps = this.PolicyStatement.PermissionSet.Copy ();
  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                                                 ps = ps.Union (child_pst.PermissionSet);
  91                                         }
  92                                 }
  93                         }
  94
  95                         PolicyStatement pst = null;
  96                         if (this.PolicyStatement != null)
  97                                 pst = this.PolicyStatement.Copy ();
  98                         else
  99                                 pst = PolicyStatement.Empty ();
 100                         pst.PermissionSet = ps;
 101                         return pst;
 102                 }
 103
 104                 public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
 105                 {
 106                         if (null == evidence)
 107                                 throw new ArgumentNullException("evidence");
 108
 109                         if (!MembershipCondition.Check (evidence))
 110                                 return null;
 111
 112                         FileCodeGroup matchRoot = new FileCodeGroup (MembershipCondition, m_access);
 113
 114                         foreach (CodeGroup child in Children) {
 115                                 CodeGroup childMatchingCodeGroup = child.ResolveMatchingCodeGroups (evidence);
 116                                 if (childMatchingCodeGroup != null)
 117                                         matchRoot.AddChild (childMatchingCodeGroup);
 118                         }
 119
 120                         return matchRoot;
 121                 }
 122
 123                 public override string AttributeString {
 124                         get { return null; }
 125                 }
 126
 127                 public override string PermissionSetName {
 128                         get { return "Same directory FileIO - " + m_access.ToString (); }
 129                 }
 130
 131                 public override bool Equals (object o)
 132                 {
 133                         if (!(o is FileCodeGroup))
 134                                 return false;
 135
 136                         if (this.m_access != ((FileCodeGroup)o).m_access)
 137                                 return false;
 138
 139                         return Equals((CodeGroup)o, false);
 140                 }
 141
 142                 public override int GetHashCode ()
 143                 {
 144                         return m_access.GetHashCode ();
 145                 }
 146
 147                 protected override void ParseXml (SecurityElement e, PolicyLevel level)
 148                 {
 149                         string a = e.Attribute ("Access");
 150                         if (a != null)
 151                                 m_access = (FileIOPermissionAccess) Enum.Parse (typeof (FileIOPermissionAccess), a, true);
 152                         else
 153                                 m_access = FileIOPermissionAccess.NoAccess;
 154                 }
 155
 156                 protected override void CreateXml (SecurityElement element, PolicyLevel level)
 157                 {
 158                         element.AddAttribute ("Access", m_access.ToString ());
 159                 }
 160         }
 161 }