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) 2004-2005 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.Collections;
  35 using System.Globalization;
  36 using System.Reflection;
  37 using System.Runtime.CompilerServices;
  38 using System.Runtime.InteropServices;
  39 using System.Security.Permissions;
  40 using System.Security.Cryptography.X509Certificates;
  41 using Mono.Security.Authenticode;
  42
  43 namespace System.Security.Policy {
  44
  45         [Serializable]
  46         [MonoTODO ("Serialization format not compatible with .NET")]
  47         [ComVisible (true)]
  48         public sealed class Evidence : ICollection, IEnumerable {
  49
  50                 private bool _locked;
  51                 private ArrayList hostEvidenceList;
  52                 private ArrayList assemblyEvidenceList;
  53
  54                 public Evidence ()
  55                 {
  56                 }
  57
  58                 public Evidence (Evidence evidence)
  59                 {
  60                         if (evidence != null)
  61                                 Merge (evidence);
  62                 }
  63
  64 #if NET_4_0
  65                 [Obsolete]
  66 #endif
  67                 public Evidence (object[] hostEvidence, object[] assemblyEvidence)
  68                 {
  69                         if (null != hostEvidence)
  70                                 HostEvidenceList.AddRange (hostEvidence);
  71                         if (null != assemblyEvidence)
  72                                 AssemblyEvidenceList.AddRange (assemblyEvidence);
  73                 }
  74
  75                 //
  76                 // Public Properties
  77                 //
  78
  79 #if NET_4_0
  80                 [Obsolete]
  81 #endif
  82                 public int Count {
  83                         get {
  84                                 int count = 0;
  85                                 if (hostEvidenceList != null)
  86                                         count += hostEvidenceList.Count;
  87                                 if (assemblyEvidenceList!= null)
  88                                         count += assemblyEvidenceList.Count;
  89                                 return count;
  90                         }
  91                 }
  92
  93                 public bool IsReadOnly {
  94                         get{ return false; }
  95                 }
  96
  97                 public bool IsSynchronized {
  98                         get { return false; }
  99                 }
 100
 101                 public bool Locked {
 102                         get { return _locked; }
 103                         [SecurityPermission (SecurityAction.Demand, ControlEvidence = true)]
 104                         set {
 105                                 _locked = value;
 106                         }
 107                 }
 108
 109                 public object SyncRoot {
 110                         get { return this; }
 111                 }
 112
 113                 internal ArrayList HostEvidenceList {
 114                         get {
 115                                 if (hostEvidenceList == null)
 116                                         hostEvidenceList = ArrayList.Synchronized (new ArrayList ());
 117                                 return hostEvidenceList;
 118                         }
 119                 }
 120
 121                 internal ArrayList AssemblyEvidenceList {
 122                         get {
 123                                 if (assemblyEvidenceList == null)
 124                                         assemblyEvidenceList = ArrayList.Synchronized (new ArrayList ());
 125                                 return assemblyEvidenceList;
 126                         }
 127                 }
 128
 129                 //
 130                 // Public Methods
 131                 //
 132
 133 #if NET_4_0
 134                 [Obsolete]
 135 #endif
 136                 public void AddAssembly (object id)
 137                 {
 138                         AssemblyEvidenceList.Add (id);
 139                 }
 140
 141 #if NET_4_0
 142                 [Obsolete]
 143 #endif
 144                 public void AddHost (object id)
 145                 {
 146                         if (_locked && SecurityManager.SecurityEnabled) {
 147                                 new SecurityPermission (SecurityPermissionFlag.ControlEvidence).Demand ();
 148                         }
 149                         HostEvidenceList.Add (id);
 150                 }
 151
 152                 [ComVisible (false)]
 153                 public void Clear ()
 154                 {
 155                         if (hostEvidenceList != null)
 156                                 hostEvidenceList.Clear ();
 157                         if (assemblyEvidenceList != null)
 158                                 assemblyEvidenceList.Clear ();
 159                 }
 160
 161 #if NET_4_0
 162                 [Obsolete]
 163 #endif
 164                 public void CopyTo (Array array, int index)
 165                 {
 166                         int hc = 0;
 167                         if (hostEvidenceList != null) {
 168                                 hc = hostEvidenceList.Count;
 169                                 if (hc > 0)
 170                                         hostEvidenceList.CopyTo (array, index);
 171                         }
 172                         if ((assemblyEvidenceList != null) && (assemblyEvidenceList.Count > 0))
 173                                 assemblyEvidenceList.CopyTo (array, index + hc);
 174                 }
 175
 176 #if !NET_4_0
 177                 [ComVisible (false)]
 178                 public override bool Equals (object obj)
 179                 {
 180                         if (obj == null)
 181                                 return false;
 182                         Evidence e = (obj as Evidence);
 183                         if (e == null)
 184                                 return false;
 185
 186                         if (HostEvidenceList.Count != e.HostEvidenceList.Count)
 187                                 return false;
 188                         if (AssemblyEvidenceList.Count != e.AssemblyEvidenceList.Count)
 189                                 return false;
 190
 191                         for (int i = 0; i < hostEvidenceList.Count; i++) {
 192                                 bool found = false;
 193                                 for (int j = 0; j < e.hostEvidenceList.Count; i++) {
 194                                         if (hostEvidenceList [i].Equals (e.hostEvidenceList [j])) {
 195                                                 found = true;
 196                                                 break;
 197                                         }
 198                                 }
 199                                 if (!found)
 200                                         return false;
 201                         }
 202                         for (int i = 0; i < assemblyEvidenceList.Count; i++) {
 203                                 bool found = false;
 204                                 for (int j = 0; j < e.assemblyEvidenceList.Count; i++) {
 205                                         if (assemblyEvidenceList [i].Equals (e.assemblyEvidenceList [j])) {
 206                                                 found = true;
 207                                                 break;
 208                                         }
 209                                 }
 210                                 if (!found)
 211                                         return false;
 212                         }
 213
 214                         return true;
 215                 }
 216 #endif
 217
 218 #if NET_4_0
 219                 [Obsolete]
 220 #endif
 221                 public IEnumerator GetEnumerator ()
 222                 {
 223                         IEnumerator he = null;
 224                         if (hostEvidenceList != null)
 225                                 he = hostEvidenceList.GetEnumerator ();
 226                         IEnumerator ae = null;
 227                         if (assemblyEvidenceList != null)
 228                                 ae = assemblyEvidenceList.GetEnumerator ();
 229                         return new EvidenceEnumerator (he, ae);
 230                 }
 231
 232                 public IEnumerator GetAssemblyEnumerator ()
 233                 {
 234                         return AssemblyEvidenceList.GetEnumerator ();
 235                 }
 236
 237 #if !NET_4_0
 238                 [ComVisible (false)]
 239                 public override int GetHashCode ()
 240                 {
 241                         int _hashCode = 0;
 242                         if (hostEvidenceList != null) {
 243                                 for (int i = 0; i < hostEvidenceList.Count; i++)
 244                                         _hashCode ^= hostEvidenceList [i].GetHashCode ();
 245                         }
 246                         if (assemblyEvidenceList != null) {
 247                                 for (int i = 0; i < assemblyEvidenceList.Count; i++)
 248                                         _hashCode ^= assemblyEvidenceList [i].GetHashCode ();
 249                         }
 250
 251                         return _hashCode;
 252                 }
 253 #endif
 254                 public IEnumerator GetHostEnumerator ()
 255                 {
 256                         return HostEvidenceList.GetEnumerator ();
 257                 }
 258
 259                 public void Merge (Evidence evidence)
 260                 {
 261                         if ((evidence != null) && (evidence.Count > 0)) {
 262                                 if (evidence.hostEvidenceList != null) {
 263                                         foreach (object o in evidence.hostEvidenceList)
 264                                                 AddHost (o);
 265                                 }
 266                                 if (evidence.assemblyEvidenceList != null) {
 267                                         foreach (object o in evidence.assemblyEvidenceList)
 268                                                 AddAssembly (o);
 269                                 }
 270                         }
 271                 }
 272
 273                 [ComVisible (false)]
 274                 public void RemoveType (Type t)
 275                 {
 276                         for (int i = hostEvidenceList.Count; i >= 0; i--) {
 277                                 if (hostEvidenceList.GetType () == t) {
 278                                         hostEvidenceList.RemoveAt (i);
 279                                 }
 280                         }
 281                         for (int i = assemblyEvidenceList.Count; i >= 0; i--) {
 282                                 if (assemblyEvidenceList.GetType () == t) {
 283                                         assemblyEvidenceList.RemoveAt (i);
 284                                 }
 285                         }
 286                 }
 287
 288                 // Use an icall to avoid multiple file i/o to detect the
 289                 // "possible" presence of an Authenticode signature
 290                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 291                 static extern bool IsAuthenticodePresent (Assembly a);
 292 #if NET_2_1
 293                 static internal Evidence GetDefaultHostEvidence (Assembly a)
 294                 {
 295                         return new Evidence ();
 296                 }
 297 #else
 298                 // this avoid us to build all evidences from the runtime
 299                 // (i.e. multiple unmanaged->managed calls) and also allows
 300                 // to delay their creation until (if) needed
 301                 [FileIOPermission (SecurityAction.Assert, Unrestricted = true)]
 302                 static internal Evidence GetDefaultHostEvidence (Assembly a)
 303                 {
 304                         Evidence e = new Evidence ();
 305                         string aname = a.EscapedCodeBase;
 306
 307                         // by default all assembly have the Zone, Url and Hash evidences
 308                         e.AddHost (Zone.CreateFromUrl (aname));
 309                         e.AddHost (new Url (aname));
 310                         e.AddHost (new Hash (a));
 311
 312                         // non local files (e.g. http://) also get a Site evidence
 313                         if (String.Compare ("FILE://", 0, aname, 0, 7, true, CultureInfo.InvariantCulture) != 0) {
 314                                 e.AddHost (Site.CreateFromUrl (aname));
 315                         }
 316
 317                         // strongnamed assemblies gets a StrongName evidence
 318                         AssemblyName an = a.UnprotectedGetName ();
 319                         byte[] pk = an.GetPublicKey ();
 320                         if ((pk != null) && (pk.Length > 0)) {
 321                                 StrongNamePublicKeyBlob blob = new StrongNamePublicKeyBlob (pk);
 322                                 e.AddHost (new StrongName (blob, an.Name, an.Version));
 323                         }
 324
 325                         // Authenticode(r) signed assemblies get a Publisher evidence
 326                         if (IsAuthenticodePresent (a)) {
 327                                 // Note: The certificate is part of the evidences even if it is not trusted!
 328                                 // so we can't call X509Certificate.CreateFromSignedFile
 329                                 AuthenticodeDeformatter ad = new AuthenticodeDeformatter (a.Location);
 330                                 if (ad.SigningCertificate != null) {
 331                                         X509Certificate x509 = new X509Certificate (ad.SigningCertificate.RawData);
 332                                         if (x509.GetHashCode () != 0) {
 333                                                 e.AddHost (new Publisher (x509));
 334                                         }
 335                                 }
 336                         }
 337                         // assemblies loaded from the GAC also get a Gac evidence (new in Fx 2.0)
 338                         if (a.GlobalAssemblyCache) {
 339                                 e.AddHost (new GacInstalled ());
 340                         }
 341
 342                         // the current HostSecurityManager may add/remove some evidence
 343                         AppDomainManager dommgr = AppDomain.CurrentDomain.DomainManager;
 344                         if (dommgr != null) {
 345                                 if ((dommgr.HostSecurityManager.Flags & HostSecurityManagerOptions.HostAssemblyEvidence) ==
 346                                         HostSecurityManagerOptions.HostAssemblyEvidence) {
 347                                         e = dommgr.HostSecurityManager.ProvideAssemblyEvidence (a, e);
 348                                 }
 349                         }
 350
 351                         return e;
 352                 }
 353
 354 #endif // NET_2_1
 355
 356                 private class EvidenceEnumerator : IEnumerator {
 357
 358                         private IEnumerator currentEnum, hostEnum, assemblyEnum;
 359
 360                         public EvidenceEnumerator (IEnumerator hostenum, IEnumerator assemblyenum)
 361                         {
 362                                 this.hostEnum = hostenum;
 363                                 this.assemblyEnum = assemblyenum;
 364                                 currentEnum = hostEnum;
 365                         }
 366
 367                         public bool MoveNext ()
 368                         {
 369                                 if (currentEnum == null)
 370                                         return false;
 371
 372                                 bool ret = currentEnum.MoveNext ();
 373
 374                                 if (!ret && (hostEnum == currentEnum) && (assemblyEnum != null)) {
 375                                         currentEnum = assemblyEnum;
 376                                         ret = assemblyEnum.MoveNext ();
 377                                 }
 378
 379                                 return ret;
 380                         }
 381
 382                         public void Reset ()
 383                         {
 384                                 if (hostEnum != null) {
 385                                         hostEnum.Reset ();
 386                                         currentEnum = hostEnum;
 387                                 } else {
 388                                         currentEnum = assemblyEnum;
 389                                 }
 390                                 if (assemblyEnum != null)
 391                                         assemblyEnum.Reset ();
 392                         }
 393
 394                         public object Current {
 395                                 get {
 396                                         return currentEnum.Current;
 397                                 }
 398                         }
 399                 }
 400         }
 401 }
 402