class/corlib/System.Security.Policy/UrlMembershipCondition.cs

   1 //
   2 // System.Security.Policy.UrlMembershipCondition.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2003, Ximian Inc.
   9 // (C) 2004 Motus Technologies Inc. (http://www.motus.com)
  10 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Collections;
  33 using System.Globalization;
  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 UrlMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  43
  44                 private readonly int version = 1;
  45
  46                 private Url url;
  47                 private string userUrl;
  48
  49                 public UrlMembershipCondition (string url)
  50                 {
  51                         if (url == null)
  52                                 throw new ArgumentNullException ("url");
  53                         CheckUrl (url);
  54                         userUrl = url;
  55                         this.url = new Url (url);
  56                 }
  57
  58                 internal UrlMembershipCondition (Url url, string userUrl)
  59                 {
  60                         // as the Url object has already been validated there's no
  61                         // need to restart the whole process by converting to string
  62                         this.url = (Url) url.Copy ();
  63                         this.userUrl = userUrl;
  64                 }
  65
  66                 // properties
  67
  68                 public string Url {
  69                         get {
  70                                 if (userUrl == null)
  71                                         userUrl = url.Value;
  72                                 return userUrl;
  73                         }
  74                         set { url = new Url (value); }
  75                 }
  76
  77                 // methods
  78
  79                 public bool Check (Evidence evidence)
  80                 {
  81                         if (evidence == null)
  82                                 return false;
  83
  84                         string u = url.Value;
  85                         int wildcard = u.LastIndexOf ("*");     // partial match with a wildcard at the end
  86                         if (wildcard == -1)
  87                                 wildcard = u.Length;            // exact match
  88
  89                         IEnumerator e = evidence.GetHostEnumerator ();
  90                         while (e.MoveNext ()) {
  91                                 if (e.Current is Url) {
  92                                         // note: there shouldn't be more than one Url evidence
  93                                         if (String.Compare (u, 0, (e.Current as Url).Value, 0, wildcard,
  94                                                 true, CultureInfo.InvariantCulture) == 0) {
  95                                                 return true;
  96                                         }
  97                                         // but we must check for all of them!
  98                                 }
  99                         }
 100                         return false;
 101                 }
 102
 103                 public IMembershipCondition Copy ()
 104                 {
 105                         return new UrlMembershipCondition (url, userUrl);
 106                 }
 107
 108                 public override bool Equals (object o)
 109                 {
 110                         UrlMembershipCondition umc = (o as UrlMembershipCondition);
 111                         if (o == null)
 112                                 return false;
 113
 114                         string u = url.Value;
 115                         int length = u.Length; // exact match
 116
 117                         // partial match with a wildcard at the end
 118                         if (u [length - 1] == '*') {
 119                                 length--;
 120                                 // in this case the last / could be ommited
 121                                 if (u [length - 1] == '/')
 122                                         length--;
 123                         }
 124
 125                         return (String.Compare (u, 0, umc.Url, 0, length, true, CultureInfo.InvariantCulture) == 0);
 126                 }
 127
 128                 public void FromXml (SecurityElement e)
 129                 {
 130                         FromXml (e, null);
 131                 }
 132
 133                 public void FromXml (SecurityElement e, PolicyLevel level)
 134                 {
 135                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 136
 137                         string u = e.Attribute ("Url");
 138                         if (u != null) {
 139                                 CheckUrl (u);
 140                                 url = new Url (u);
 141                         } else {
 142                                 url = null;
 143                         }
 144                         userUrl = u;
 145                 }
 146
 147                 public override int GetHashCode ()
 148                 {
 149                         return url.GetHashCode ();
 150                 }
 151
 152                 public override string ToString ()
 153                 {
 154                         return "Url - " + Url;
 155                 }
 156
 157                 public SecurityElement ToXml ()
 158                 {
 159                         return ToXml (null);
 160                 }
 161
 162                 public SecurityElement ToXml (PolicyLevel level)
 163                 {
 164                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 165                         SecurityElement se = MembershipConditionHelper.Element (typeof (UrlMembershipCondition), version);
 166                         se.AddAttribute ("Url", userUrl);
 167                         return se;
 168                 }
 169
 170                 // internal stuff
 171
 172                 internal void CheckUrl (string url)
 173                 {
 174                         // In .NET 1.x Url class checked the validity of the
 175                         // URL but that's no more the case in 2.x - but we
 176                         // still need the check done here
 177                         int protocolPos = url.IndexOf (Uri.SchemeDelimiter);
 178                         string u = (protocolPos < 0) ? "file://" + url : url;
 179
 180                         Uri uri = new Uri (u, false, false);
 181                         // no * except for the "lone star" case
 182                         if (uri.Host.IndexOf ('*') >= 1) {
 183                                 string msg = Locale.GetText ("Invalid * character in url");
 184                                 throw new ArgumentException (msg, "name");
 185                         }
 186                 }
 187         }
 188 }