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

   1 //
   2 // System.Security.Policy.Evidence
   3 //
   4 // Authors:
   5 //      Sean MacIsaac (macisaac@ximian.com)
   6 //      Nick Drochak (ndrochak@gol.com)
   7 //      Jackson Harper (Jackson@LatitudeGeo.com)
   8 //      Sebastien Pouliot  <sebastien@ximian.com>
   9 //
  10 // (C) 2001 Ximian, Inc.
  11 // Portions (C) 2003, 2004 Motus Technologies Inc. (http://www.motus.com)
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Collections;
  36 using System.Reflection;
  37 using System.Security.Permissions;
  38 using System.Security.Cryptography.X509Certificates;
  39
  40 namespace System.Security.Policy {
  41
  42         [Serializable]
  43         [MonoTODO ("Fix serialization compatibility with MS.NET")]
  44         public sealed class Evidence : ICollection, IEnumerable {
  45
  46                 private bool _locked;
  47                 private ArrayList hostEvidenceList;
  48                 private ArrayList assemblyEvidenceList;
  49                 private int _hashCode;
  50
  51                 public Evidence ()
  52                 {
  53                         hostEvidenceList = ArrayList.Synchronized (new ArrayList ());
  54                         assemblyEvidenceList = ArrayList.Synchronized (new ArrayList ());
  55                 }
  56
  57                 public Evidence (Evidence evidence) : this ()
  58                 {
  59                         if (evidence != null)
  60                                 Merge (evidence);
  61                 }
  62
  63                 public Evidence (object[] hostEvidence, object[] assemblyEvidence) : this ()
  64                 {
  65                         if (null != hostEvidence)
  66                                 hostEvidenceList.AddRange (hostEvidence);
  67                         if (null != assemblyEvidence)
  68                                 assemblyEvidenceList.AddRange (assemblyEvidence);
  69                 }
  70
  71                 //
  72                 // Public Properties
  73                 //
  74
  75                 public int Count {
  76                         get {
  77                                 return (hostEvidenceList.Count + assemblyEvidenceList.Count);
  78                         }
  79                 }
  80
  81                 public bool IsReadOnly {
  82                         get{ return false; }
  83                 }
  84
  85                 // LAMESPEC: Always TRUE (not FALSE)
  86                 public bool IsSynchronized {
  87                         get { return true; }
  88                 }
  89
  90                 public bool Locked {
  91                         get { return _locked; }
  92                         set {
  93                                 new SecurityPermission (SecurityPermissionFlag.ControlEvidence).Demand ();
  94                                 _locked = value;
  95                         }
  96                 }
  97
  98                 public object SyncRoot {
  99                         get { return this; }
 100                 }
 101
 102                 //
 103                 // Public Methods
 104                 //
 105
 106                 public void AddAssembly (object id)
 107                 {
 108                         assemblyEvidenceList.Add (id);
 109                         _hashCode = 0;
 110                 }
 111
 112                 public void AddHost (object id)
 113                 {
 114                         if (_locked) {
 115                                 new SecurityPermission (SecurityPermissionFlag.ControlEvidence).Demand ();
 116                         }
 117                         hostEvidenceList.Add (id);
 118                         _hashCode = 0;
 119                 }
 120
 121 #if NET_2_0
 122                 public void Clear ()
 123                 {
 124                         hostEvidenceList.Clear ();
 125                         assemblyEvidenceList.Clear ();
 126                         _hashCode = 0;
 127                 }
 128 #endif
 129
 130                 public void CopyTo (Array array, int index)
 131                 {
 132                         if (hostEvidenceList.Count > 0)
 133                                 hostEvidenceList.CopyTo (array, index);
 134                         if (assemblyEvidenceList.Count > 0)
 135                                 assemblyEvidenceList.CopyTo (array, index + hostEvidenceList.Count);
 136                 }
 137
 138 #if NET_2_0
 139                 public override bool Equals (object obj)
 140                 {
 141                         if (obj == null)
 142                                 return false;
 143                         Evidence e = (obj as Evidence);
 144                         if (e == null)
 145                                 return false;
 146
 147                         if (hostEvidenceList.Count != e.hostEvidenceList.Count)
 148                                 return false;
 149                         if (assemblyEvidenceList.Count != e.assemblyEvidenceList.Count)
 150                                 return false;
 151
 152                         for (int i = 0; i < hostEvidenceList.Count; i++) {
 153                                 bool found = false;
 154                                 for (int j = 0; j < e.hostEvidenceList.Count; i++) {
 155                                         if (hostEvidenceList [i].Equals (e.hostEvidenceList [j])) {
 156                                                 found = true;
 157                                                 break;
 158                                         }
 159                                 }
 160                                 if (!found)
 161                                         return false;
 162                         }
 163                         for (int i = 0; i < assemblyEvidenceList.Count; i++) {
 164                                 bool found = false;
 165                                 for (int j = 0; j < e.assemblyEvidenceList.Count; i++) {
 166                                         if (assemblyEvidenceList [i].Equals (e.assemblyEvidenceList [j])) {
 167                                                 found = true;
 168                                                 break;
 169                                         }
 170                                 }
 171                                 if (!found)
 172                                         return false;
 173                         }
 174
 175                         return true;
 176                 }
 177 #endif
 178
 179                 public IEnumerator GetEnumerator ()
 180                 {
 181                         return new EvidenceEnumerator (hostEvidenceList.GetEnumerator (),
 182                                 assemblyEvidenceList.GetEnumerator ());
 183                 }
 184
 185                 public IEnumerator GetAssemblyEnumerator ()
 186                 {
 187                         return assemblyEvidenceList.GetEnumerator ();
 188                 }
 189
 190 #if NET_2_0
 191                 public override int GetHashCode ()
 192                 {
 193                         // kind of long so we cache it
 194                         if (_hashCode == 0) {
 195                                 for (int i = 0; i < hostEvidenceList.Count; i++)
 196                                         _hashCode ^= hostEvidenceList [i].GetHashCode ();
 197                                 for (int i = 0; i < assemblyEvidenceList.Count; i++)
 198                                         _hashCode ^= assemblyEvidenceList [i].GetHashCode ();
 199                         }
 200                         return _hashCode;
 201                 }
 202 #endif
 203
 204                 public IEnumerator GetHostEnumerator ()
 205                 {
 206                         return hostEvidenceList.GetEnumerator ();
 207                 }
 208
 209                 public void Merge (Evidence evidence)
 210                 {
 211                         IEnumerator hostenum, assemblyenum;
 212
 213                         hostenum = evidence.GetHostEnumerator ();
 214                         while( hostenum.MoveNext () ) {
 215                                 AddHost (hostenum.Current);
 216                         }
 217
 218                         assemblyenum = evidence.GetAssemblyEnumerator ();
 219                         while( assemblyenum.MoveNext () ) {
 220                                 AddAssembly (assemblyenum.Current);
 221                         }
 222                 }
 223
 224 #if NET_2_0
 225                 public void RemoveType (Type t)
 226                 {
 227                         for (int i = hostEvidenceList.Count; i >= 0; i--) {
 228                                 if (hostEvidenceList.GetType () == t) {
 229                                         hostEvidenceList.RemoveAt (i);
 230                                         _hashCode = 0;
 231                                 }
 232                         }
 233                         for (int i = assemblyEvidenceList.Count; i >= 0; i--) {
 234                                 if (assemblyEvidenceList.GetType () == t) {
 235                                         assemblyEvidenceList.RemoveAt (i);
 236                                         _hashCode = 0;
 237                                 }
 238                         }
 239                 }
 240 #endif
 241
 242                 // this avoid us to build all evidences from the runtime
 243                 // (i.e. multiple unmanaged->managed calls) and also allows
 244                 // to delay their creation until (if) needed
 245                 static internal Evidence GetDefaultHostEvidence (Assembly a)
 246                 {
 247                         Evidence e = new Evidence ();
 248                         string aname = a.CodeBase;
 249
 250                         // by default all assembly have the Zone, Url and Hash evidences
 251                         e.AddHost (Zone.CreateFromUrl (aname));
 252                         e.AddHost (new Url (aname));
 253                         e.AddHost (new Hash (a));
 254
 255                         // non local files (e.g. http://) also get a Site evidence
 256                         if (!aname.ToUpper ().StartsWith ("FILE://")) {
 257                                 e.AddHost (Site.CreateFromUrl (aname));
 258                         }
 259
 260                         // strongnamed assemblies gets a StrongName evidence
 261                         AssemblyName an = a.GetName ();
 262                         byte[] pk = an.GetPublicKey ();
 263                         if (pk != null) {
 264                                 StrongNamePublicKeyBlob blob = new StrongNamePublicKeyBlob (pk);
 265                                 e.AddHost (new StrongName (blob, an.Name, an.Version));
 266                         }
 267
 268                         // Authenticode(r) signed assemblies get a Publisher evidence
 269                         try {
 270                                 X509Certificate x509 = X509Certificate.CreateFromSignedFile (a.Location);
 271                                 if (x509.GetHashCode () != 0) {
 272                                         e.AddHost (new Publisher (x509));
 273                                 }
 274                         }
 275                         catch (ArgumentException) {
 276                                 // URI are not supported
 277                         }
 278 #if NET_2_0
 279                         // assemblies loaded from the GAC also get a Gac evidence (new in Fx 2.0)
 280                         if (a.GlobalAssemblyCache) {
 281                                 e.AddHost (new Gac ());
 282                         }
 283 /*
 284                         // the current HostSecurityManager may add/remove some evidence
 285                         AppDomainManager dommgr = AppDomain.CurrentDomain.DomainManager;
 286                         if (dommgr != null) {
 287                                 if ((dommgr.HostSecurityManager.Flags & HostSecurityManagerFlags.HostAssemblyEvidence) ==
 288                                         HostSecurityManagerFlags.HostAssemblyEvidence) {
 289                                         e = dommgr.HostSecurityManager.ProvideAssemblyEvidence (a, e);
 290                                 }
 291                         }*/
 292 #endif
 293                         return e;
 294                 }
 295
 296                 private class EvidenceEnumerator : IEnumerator {
 297
 298                         private IEnumerator currentEnum, hostEnum, assemblyEnum;
 299
 300                         public EvidenceEnumerator (IEnumerator hostenum, IEnumerator assemblyenum)
 301                         {
 302                                 this.hostEnum = hostenum;
 303                                 this.assemblyEnum = assemblyenum;
 304                                 currentEnum = hostEnum;
 305                         }
 306
 307                         public bool MoveNext ()
 308                         {
 309                                 bool ret = currentEnum.MoveNext ();
 310
 311                                 if ( !ret && hostEnum == currentEnum ) {
 312                                         currentEnum = assemblyEnum;
 313                                         ret = assemblyEnum.MoveNext ();
 314                                 }
 315
 316                                 return ret;
 317                         }
 318
 319                         public void Reset ()
 320                         {
 321                                 hostEnum.Reset ();
 322                                 assemblyEnum.Reset ();
 323                                 currentEnum = hostEnum;
 324                         }
 325
 326                         public object Current {
 327                                 get {
 328                                         return currentEnum.Current;
 329                                 }
 330                         }
 331                 }
 332         }
 333 }
 334