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         [ComVisible (true)]
  38         public sealed class FileCodeGroup : CodeGroup {
  39
  40                 private FileIOPermissionAccess m_access;
  41
  42                 public FileCodeGroup (IMembershipCondition membershipCondition, FileIOPermissionAccess access)
  43                         : base (membershipCondition, null)
  44                 {
  45                         // note: FileIOPermissionAccess is a [Flag]
  46                         m_access = access;
  47                 }
  48
  49                 // for PolicyLevel (to avoid validation duplication)
  50                 internal FileCodeGroup (SecurityElement e, PolicyLevel level)
  51                         : base (e, level)
  52                 {
  53                 }
  54
  55                 public override CodeGroup Copy ()
  56                 {
  57                         FileCodeGroup copy = new FileCodeGroup (MembershipCondition, m_access);
  58                         copy.Name = this.Name;
  59                         copy.Description = this.Description;
  60                         foreach (CodeGroup child in Children) {
  61                                 copy.AddChild (child.Copy ());  // deep copy
  62                         }
  63                         return copy;
  64                 }
  65
  66                 public override string MergeLogic {
  67                         get { return "Union";}
  68                 }
  69
  70                 public override PolicyStatement Resolve (Evidence evidence)
  71                 {
  72                         if (null == evidence)
  73                                 throw new ArgumentNullException("evidence");
  74
  75                         if (!MembershipCondition.Check (evidence))
  76                                 return null;
  77
  78                         PermissionSet ps = null;
  79                         if (this.PolicyStatement == null)
  80                                 ps = new PermissionSet (PermissionState.None);
  81                         else
  82                                 ps = this.PolicyStatement.PermissionSet.Copy ();
  83
  84                         if (this.Children.Count > 0) {
  85                                 foreach (CodeGroup child_cg in this.Children) {
  86                                         PolicyStatement child_pst = child_cg.Resolve (evidence);
  87                                         if (child_pst != null) {
  88                                                 ps = ps.Union (child_pst.PermissionSet);
  89                                         }
  90                                 }
  91                         }
  92
  93                         PolicyStatement pst = null;
  94                         if (this.PolicyStatement != null)
  95                                 pst = this.PolicyStatement.Copy ();
  96                         else
  97                                 pst = PolicyStatement.Empty ();
  98                         pst.PermissionSet = ps;
  99                         return pst;
 100                 }
 101
 102                 public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
 103                 {
 104                         if (null == evidence)
 105                                 throw new ArgumentNullException("evidence");
 106
 107                         if (!MembershipCondition.Check (evidence))
 108                                 return null;
 109
 110                         FileCodeGroup matchRoot = new FileCodeGroup (MembershipCondition, m_access);
 111
 112                         foreach (CodeGroup child in Children) {
 113                                 CodeGroup childMatchingCodeGroup = child.ResolveMatchingCodeGroups (evidence);
 114                                 if (childMatchingCodeGroup != null)
 115                                         matchRoot.AddChild (childMatchingCodeGroup);
 116                         }
 117
 118                         return matchRoot;
 119                 }
 120
 121                 public override string AttributeString {
 122                         get { return null; }
 123                 }
 124
 125                 public override string PermissionSetName {
 126                         get { return "Same directory FileIO - " + m_access.ToString (); }
 127                 }
 128
 129                 public override bool Equals (object o)
 130                 {
 131                         if (!(o is FileCodeGroup))
 132                                 return false;
 133
 134                         if (this.m_access != ((FileCodeGroup)o).m_access)
 135                                 return false;
 136
 137                         return Equals((CodeGroup)o, false);
 138                 }
 139
 140                 public override int GetHashCode ()
 141                 {
 142                         return m_access.GetHashCode ();
 143                 }
 144
 145                 protected override void ParseXml (SecurityElement e, PolicyLevel level)
 146                 {
 147                         string a = e.Attribute ("Access");
 148                         if (a != null)
 149                                 m_access = (FileIOPermissionAccess) Enum.Parse (typeof (FileIOPermissionAccess), a, true);
 150                         else
 151                                 m_access = FileIOPermissionAccess.NoAccess;
 152                 }
 153
 154                 protected override void CreateXml (SecurityElement element, PolicyLevel level)
 155                 {
 156                         element.AddAttribute ("Access", m_access.ToString ());
 157                 }
 158         }
 159 }