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

   1 //
   2 // System.Security.Policy.Zone
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2002 Ximian, Inc (http://www.ximian.com)
   9 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.IO;
  32 using System.Globalization;
  33 using System.Security.Permissions;
  34 using System.Runtime.InteropServices;
  35
  36 using Mono.Security;
  37
  38 namespace System.Security.Policy {
  39
  40         [Serializable]
  41         [ComVisible (true)]
  42         public sealed class Zone :
  43                 EvidenceBase,
  44                 IIdentityPermissionFactory, IBuiltInEvidence    {
  45
  46                 private SecurityZone zone;
  47
  48                 public Zone (SecurityZone zone)
  49                 {
  50                         if (!Enum.IsDefined (typeof (SecurityZone), zone)) {
  51                                 string msg = String.Format (Locale.GetText ("Invalid zone {0}."), zone);
  52                                 throw new ArgumentException (msg, "zone");
  53                         }
  54
  55                         this.zone = zone;
  56                 }
  57
  58                 // properties
  59
  60                 public SecurityZone SecurityZone {
  61                         get { return zone; }
  62                 }
  63
  64                 // methods
  65
  66                 public object Copy ()
  67                 {
  68                         return new Zone (zone);
  69                 }
  70
  71                 public IPermission CreateIdentityPermission (Evidence evidence)
  72                 {
  73                         return new ZoneIdentityPermission (zone);
  74                 }
  75
  76                 [MonoTODO ("Not user configurable yet")]
  77                 public static Zone CreateFromUrl (string url)
  78                 {
  79                         if (url == null)
  80                                 throw new ArgumentNullException ("url");
  81
  82                         SecurityZone z = SecurityZone.NoZone;
  83                         if (url.Length == 0)
  84                                 return new Zone (z);
  85
  86                         Uri uri = null;
  87                         try {
  88                                 uri = new Uri (url);
  89                         }
  90                         catch {
  91                                 return new Zone (z);
  92                         }
  93                         // TODO: apply zone configuration
  94                         // this is the only way to use the Trusted and Untrusted zones
  95
  96                         if (z == SecurityZone.NoZone) {
  97                                 // not part of configuration, the use default mapping
  98                                 if (uri.IsFile) {
  99                                         if (File.Exists (uri.LocalPath))
 100                                                 z = SecurityZone.MyComputer;
 101                                         else if (String.Compare ("FILE://", 0, url, 0, 7, true, CultureInfo.InvariantCulture) == 0)
 102                                                 z = SecurityZone.Intranet;      // non accessible file://
 103                                         else
 104                                                 z = SecurityZone.Internet;
 105                                 }
 106                                 else if (uri.IsLoopback) {                      // e.g. http://localhost/x
 107                                         z = SecurityZone.Intranet;
 108                                 }
 109                                 else {
 110                                         // all protocols, including unknown ones
 111                                         z = SecurityZone.Internet;
 112                                 }
 113                         }
 114
 115                         return new Zone (z);
 116                 }
 117
 118                 public override bool Equals (object o)
 119                 {
 120                         Zone z = (o as Zone);
 121                         if (z == null)
 122                                 return false;
 123
 124                         return (z.zone == zone);
 125                 }
 126
 127                 public override int GetHashCode ()
 128                 {
 129                         return (int) zone;
 130                 }
 131
 132                 public override string ToString ()
 133                 {
 134                         SecurityElement se = new SecurityElement ("System.Security.Policy.Zone");
 135                         se.AddAttribute ("version", "1");
 136                         se.AddChild (new SecurityElement ("Zone", zone.ToString ()));
 137                         return se.ToString ();
 138                 }
 139
 140                 // interface IBuiltInEvidence
 141
 142                 int IBuiltInEvidence.GetRequiredSize (bool verbose)
 143                 {
 144                         return 3;
 145                 }
 146
 147                 int IBuiltInEvidence.InitFromBuffer (char [] buffer, int position)
 148                 {
 149                         int new_zone = (int) buffer [position++];
 150                         new_zone += buffer [position++];
 151                         return position;
 152                 }
 153
 154                 int IBuiltInEvidence.OutputToBuffer (char [] buffer, int position, bool verbose)
 155                 {
 156                         buffer [position++] = '\x0003';
 157                         buffer [position++] = (char) (((int) zone) >> 16);
 158                         buffer [position++] = (char) (((int) zone) & 0x0FFFF);
 159                         return position;
 160                 }
 161         }
 162 }