2 // System.Security.Permissions.SiteIdentityPermission.cs
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // Copyright (C) 2003 Motus Technologies. http://www.motus.com
8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
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.
30 using System.Globalization;
32 namespace System.Security.Permissions {
35 public sealed class SiteIdentityPermission : CodeAccessPermission, IBuiltInPermission {
37 private const int version = 1;
43 public SiteIdentityPermission (PermissionState state)
45 // false == do not allow Unrestricted for Identity Permissions
46 CheckPermissionState (state, false);
49 public SiteIdentityPermission (string site)
59 throw new NullReferenceException ("No site.");
64 throw new ArgumentException ("Invalid site.");
71 public override IPermission Copy ()
74 return new SiteIdentityPermission (PermissionState.None);
76 return new SiteIdentityPermission (_site);
79 public override void FromXml (SecurityElement esd)
81 // General validation in CodeAccessPermission
82 CheckSecurityElement (esd, "esd", version, version);
83 // Note: we do not (yet) care about the return value
84 // as we only accept version 1 (min/max values)
86 string s = esd.Attribute ("Site");
91 public override IPermission Intersect (IPermission target)
93 SiteIdentityPermission sip = Cast (target);
94 if ((sip == null) || (IsEmpty ()))
97 if (Match (sip._site)) {
98 string s = ((_site.Length > sip._site.Length) ? _site : sip._site);
99 return new SiteIdentityPermission (s);
104 public override bool IsSubsetOf (IPermission target)
106 SiteIdentityPermission sip = Cast (target);
109 if ((_site == null) && (sip._site == null))
111 if ((_site == null) || (sip._site == null))
114 int wildcard = sip._site.IndexOf ('*');
115 if (wildcard == -1) {
117 return (_site == sip._site);
119 return _site.EndsWith (sip._site.Substring (wildcard + 1));
122 public override SecurityElement ToXml ()
124 SecurityElement e = Element (version);
126 e.AddAttribute ("Site", _site);
130 public override IPermission Union (IPermission target)
132 SiteIdentityPermission sip = Cast (target);
133 if ((sip == null) || sip.IsEmpty ())
138 if (Match (sip._site)) {
139 string s = ((_site.Length < sip._site.Length) ? _site : sip._site);
140 return new SiteIdentityPermission (s);
143 throw new ArgumentException (Locale.GetText (
144 "Cannot union two different sites."), "target");
150 // IBuiltInPermission
151 int IBuiltInPermission.GetTokenIndex ()
153 return (int) BuiltInToken.SiteIdentity;
158 private bool IsEmpty ()
160 return (_site == null);
163 private SiteIdentityPermission Cast (IPermission target)
168 SiteIdentityPermission sip = (target as SiteIdentityPermission);
170 ThrowInvalidPermission (target, typeof (SiteIdentityPermission));
176 private static bool[] valid = new bool [94] {
177 /* 33 */ true, false, true, true, true, true, true, true, true, true,
178 /* 43 */ false, false, true, true, false, true, true, true, true, true,
179 /* 53 */ true, true, true, true, false, false, false, false, false, false,
180 /* 63 */ false, true, true, true, true, true, true, true, true, true,
181 /* 73 */ true, true, true, true, true, true, true, true, true, true,
182 /* 83 */ true, true, true, true, true, true, true, true, false, false,
183 /* 93 */ false, true, true, false, true, true, true, true, true, true,
184 /* 103 */ true, true, true, true, true, true, true, true, true, true,
185 /* 113 */ true, true, true, true, true, true, true, true, true, true,
186 /* 123 */ true, false, true, true
189 private bool IsValid (string s)
191 if ((s == null) || (s.Length == 0))
194 for (int i = 0; i < s.Length; i++) {
195 ushort x = (ushort) s [i];
196 if ((x < 33) || (x > 126)) {
200 // special case for wildcards (*)
201 // must be alone or first and followed by a dot
202 if ((s.Length > 1) && ((s [i + 1] != '.') || (i > 0)))
205 if (!valid [x - 33]) {
210 // a lone dot isn't valid
212 return (s [0] != '.');
216 private bool Match (string target)
218 if ((_site == null) || (target == null))
221 int wcs = _site.IndexOf ('*');
222 int wct = target.IndexOf ('*');
224 if ((wcs == -1) && (wct == -1)) {
225 // no wildcard, this is an exact match
226 return (_site == target);
228 else if (wcs == -1) {
229 // only "target" has a wildcard, use it
230 return _site.EndsWith (target.Substring (wct + 1));
232 else if (wct == -1) {
233 // only "this" has a wildcard, use it
234 return target.EndsWith (_site.Substring (wcs + 1));
237 // both have wildcards, partial match with the smallest
238 string s = _site.Substring (wcs + 1);
239 target = target.Substring (wct + 1);
240 if (s.Length > target.Length)
241 return s.EndsWith (target);
243 return target.EndsWith (s);