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
  42 using Mono.Security.Authenticode;
  43
  44 namespace System.Security.Policy {
  45
  46         [Serializable]
  47         [MonoTODO ("Fix serialization compatibility with MS.NET")]
  48 #if NET_2_0
  49         [ComVisible (true)]
  50 #endif
  51         public sealed class Evidence : ICollection, IEnumerable {
  52
  53                 private bool _locked;
  54                 private ArrayList hostEvidenceList;
  55                 private ArrayList assemblyEvidenceList;
  56                 private int _hashCode;
  57
  58                 public Evidence ()
  59                 {
  60                 }
  61
  62                 public Evidence (Evidence evidence)
  63                 {
  64                         if (evidence != null)
  65                                 Merge (evidence);
  66                 }
  67
  68                 public Evidence (object[] hostEvidence, object[] assemblyEvidence)
  69                 {
  70                         if (null != hostEvidence)
  71                                 HostEvidenceList.AddRange (hostEvidence);
  72                         if (null != assemblyEvidence)
  73                                 AssemblyEvidenceList.AddRange (assemblyEvidence);
  74                 }
  75
  76                 //
  77                 // Public Properties
  78                 //
  79
  80                 public int Count {
  81                         get {
  82                                 int count = 0;
  83                                 if (hostEvidenceList != null)
  84                                         count += hostEvidenceList.Count;
  85                                 if (assemblyEvidenceList!= null)
  86                                         count += assemblyEvidenceList.Count;
  87                                 return count;
  88                         }
  89                 }
  90
  91                 public bool IsReadOnly {
  92                         get{ return false; }
  93                 }
  94
  95                 public bool IsSynchronized {
  96 #if NET_2_0
  97                         get { return false; }
  98 #else
  99                         // LAMESPEC: Always TRUE (not FALSE)
 100                         get { return true; }
 101 #endif
 102                 }
 103
 104                 public bool Locked {
 105                         get { return _locked; }
 106                         [SecurityPermission (SecurityAction.Demand, ControlEvidence = true)]
 107                         set {
 108                                 _locked = value;
 109                         }
 110                 }
 111
 112                 public object SyncRoot {
 113                         get { return this; }
 114                 }
 115
 116                 internal ArrayList HostEvidenceList {
 117                         get {
 118                                 if (hostEvidenceList == null)
 119                                         hostEvidenceList = ArrayList.Synchronized (new ArrayList ());
 120                                 return hostEvidenceList;
 121                         }
 122                 }
 123
 124                 internal ArrayList AssemblyEvidenceList {
 125                         get {
 126                                 if (assemblyEvidenceList == null)
 127                                         assemblyEvidenceList = ArrayList.Synchronized (new ArrayList ());
 128                                 return assemblyEvidenceList;
 129                         }
 130                 }
 131
 132                 //
 133                 // Public Methods
 134                 //
 135
 136                 public void AddAssembly (object id)
 137                 {
 138                         AssemblyEvidenceList.Add (id);
 139                         _hashCode = 0;
 140                 }
 141
 142                 public void AddHost (object id)
 143                 {
 144                         if (_locked && SecurityManager.SecurityEnabled) {
 145                                 new SecurityPermission (SecurityPermissionFlag.ControlEvidence).Demand ();
 146                         }
 147                         HostEvidenceList.Add (id);
 148                         _hashCode = 0;
 149                 }
 150
 151 #if NET_2_0
 152                 [ComVisible (false)]
 153                 public void Clear ()
 154                 {
 155                         if (hostEvidenceList != null)
 156                                 hostEvidenceList.Clear ();
 157                         if (assemblyEvidenceList != null)
 158                                 assemblyEvidenceList.Clear ();
 159                         _hashCode = 0;
 160                 }
 161 #endif
 162
 163                 public void CopyTo (Array array, int index)
 164                 {
 165                         int hc = 0;
 166                         if (hostEvidenceList != null) {
 167                                 hc = hostEvidenceList.Count;
 168                                 if (hc > 0)
 169                                         hostEvidenceList.CopyTo (array, index);
 170                         }
 171                         if ((assemblyEvidenceList != null) && (assemblyEvidenceList.Count > 0))
 172                                 assemblyEvidenceList.CopyTo (array, index + hc);
 173                 }
 174
 175 #if NET_2_0
 176                 [ComVisible (false)]
 177                 public override bool Equals (object obj)
 178                 {
 179                         if (obj == null)
 180                                 return false;
 181                         Evidence e = (obj as Evidence);
 182                         if (e == null)
 183                                 return false;
 184
 185                         if (HostEvidenceList.Count != e.HostEvidenceList.Count)
 186                                 return false;
 187                         if (AssemblyEvidenceList.Count != e.AssemblyEvidenceList.Count)
 188                                 return false;
 189
 190                         for (int i = 0; i < hostEvidenceList.Count; i++) {
 191                                 bool found = false;
 192                                 for (int j = 0; j < e.hostEvidenceList.Count; i++) {
 193                                         if (hostEvidenceList [i].Equals (e.hostEvidenceList [j])) {
 194                                                 found = true;
 195                                                 break;
 196                                         }
 197                                 }
 198                                 if (!found)
 199                                         return false;
 200                         }
 201                         for (int i = 0; i < assemblyEvidenceList.Count; i++) {
 202                                 bool found = false;
 203                                 for (int j = 0; j < e.assemblyEvidenceList.Count; i++) {
 204                                         if (assemblyEvidenceList [i].Equals (e.assemblyEvidenceList [j])) {
 205                                                 found = true;
 206                                                 break;
 207                                         }
 208                                 }
 209                                 if (!found)
 210                                         return false;
 211                         }
 212
 213                         return true;
 214                 }
 215 #endif
 216
 217                 public IEnumerator GetEnumerator ()
 218                 {
 219                         IEnumerator he = null;
 220                         if (hostEvidenceList != null)
 221                                 he = hostEvidenceList.GetEnumerator ();
 222                         IEnumerator ae = null;
 223                         if (assemblyEvidenceList != null)
 224                                 assemblyEvidenceList.GetEnumerator ();
 225                         return new EvidenceEnumerator (he, ae);
 226                 }
 227
 228                 public IEnumerator GetAssemblyEnumerator ()
 229                 {
 230                         return AssemblyEvidenceList.GetEnumerator ();
 231                 }
 232
 233 #if NET_2_0
 234                 [ComVisible (false)]
 235                 public override int GetHashCode ()
 236                 {
 237                         // kind of long so we cache it
 238                         if (_hashCode == 0) {
 239                                 if (hostEvidenceList != null) {
 240                                         for (int i = 0; i < hostEvidenceList.Count; i++)
 241                                                 _hashCode ^= hostEvidenceList [i].GetHashCode ();
 242                                 }
 243                                 if (assemblyEvidenceList != null) {
 244                                         for (int i = 0; i < assemblyEvidenceList.Count; i++)
 245                                                 _hashCode ^= assemblyEvidenceList [i].GetHashCode ();
 246                                 }
 247                         }
 248                         return _hashCode;
 249                 }
 250 #endif
 251
 252                 public IEnumerator GetHostEnumerator ()
 253                 {
 254                         return HostEvidenceList.GetEnumerator ();
 255                 }
 256
 257                 public void Merge (Evidence evidence)
 258                 {
 259                         if ((evidence != null) && (evidence.Count > 0)) {
 260                                 if (evidence.hostEvidenceList != null) {
 261                                         foreach (object o in evidence.hostEvidenceList)
 262                                                 AddHost (o);
 263                                 }
 264                                 if (evidence.assemblyEvidenceList != null) {
 265                                         foreach (object o in evidence.assemblyEvidenceList)
 266                                                 AddAssembly (o);
 267                                 }
 268                                 _hashCode = 0;
 269                         }
 270                 }
 271
 272 #if NET_2_0
 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                                         _hashCode = 0;
 280                                 }
 281                         }
 282                         for (int i = assemblyEvidenceList.Count; i >= 0; i--) {
 283                                 if (assemblyEvidenceList.GetType () == t) {
 284                                         assemblyEvidenceList.RemoveAt (i);
 285                                         _hashCode = 0;
 286                                 }
 287                         }
 288                 }
 289 #endif
 290
 291                 // Use an icall to avoid multiple file i/o to detect the
 292                 // "possible" presence of an Authenticode signature
 293                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 294                 static extern bool IsAuthenticodePresent (Assembly a);
 295
 296                 // this avoid us to build all evidences from the runtime
 297                 // (i.e. multiple unmanaged->managed calls) and also allows
 298                 // to delay their creation until (if) needed
 299                 [FileIOPermission (SecurityAction.Assert, Unrestricted = true)]
 300                 static internal Evidence GetDefaultHostEvidence (Assembly a)
 301                 {
 302                         Evidence e = new Evidence ();
 303                         string aname = a.EscapedCodeBase;
 304
 305                         // by default all assembly have the Zone, Url and Hash evidences
 306                         e.AddHost (Zone.CreateFromUrl (aname));
 307                         e.AddHost (new Url (aname));
 308                         e.AddHost (new Hash (a));
 309
 310                         // non local files (e.g. http://) also get a Site evidence
 311                         if (String.Compare ("FILE://", 0, aname, 0, 7, true, CultureInfo.InvariantCulture) != 0) {
 312                                 e.AddHost (Site.CreateFromUrl (aname));
 313                         }
 314
 315                         // strongnamed assemblies gets a StrongName evidence
 316                         AssemblyName an = a.UnprotectedGetName ();
 317                         byte[] pk = an.GetPublicKey ();
 318                         if ((pk != null) && (pk.Length > 0)) {
 319                                 StrongNamePublicKeyBlob blob = new StrongNamePublicKeyBlob (pk);
 320                                 e.AddHost (new StrongName (blob, an.Name, an.Version));
 321                         }
 322
 323                         // Authenticode(r) signed assemblies get a Publisher evidence
 324                         if (IsAuthenticodePresent (a)) {
 325                                 // Note: The certificate is part of the evidences even if it is not trusted!
 326                                 // so we can't call X509Certificate.CreateFromSignedFile
 327                                 AuthenticodeDeformatter ad = new AuthenticodeDeformatter (a.Location);
 328                                 if (ad.SigningCertificate != null) {
 329                                         X509Certificate x509 = new X509Certificate (ad.SigningCertificate.RawData);
 330                                         if (x509.GetHashCode () != 0) {
 331                                                 e.AddHost (new Publisher (x509));
 332                                         }
 333                                 }
 334                         }
 335 #if NET_2_0
 336                         // assemblies loaded from the GAC also get a Gac evidence (new in Fx 2.0)
 337                         if (a.GlobalAssemblyCache) {
 338                                 e.AddHost (new GacInstalled ());
 339                         }
 340
 341                         // the current HostSecurityManager may add/remove some evidence
 342                         AppDomainManager dommgr = AppDomain.CurrentDomain.DomainManager;
 343                         if (dommgr != null) {
 344                                 if ((dommgr.HostSecurityManager.Flags & HostSecurityManagerOptions.HostAssemblyEvidence) ==
 345                                         HostSecurityManagerOptions.HostAssemblyEvidence) {
 346                                         e = dommgr.HostSecurityManager.ProvideAssemblyEvidence (a, e);
 347                                 }
 348                         }
 349 #endif
 350                         return e;
 351                 }
 352
 353                 private class EvidenceEnumerator : IEnumerator {
 354
 355                         private IEnumerator currentEnum, hostEnum, assemblyEnum;
 356
 357                         public EvidenceEnumerator (IEnumerator hostenum, IEnumerator assemblyenum)
 358                         {
 359                                 this.hostEnum = hostenum;
 360                                 this.assemblyEnum = assemblyenum;
 361                                 currentEnum = hostEnum;
 362                         }
 363
 364                         public bool MoveNext ()
 365                         {
 366                                 if (currentEnum == null)
 367                                         return false;
 368
 369                                 bool ret = currentEnum.MoveNext ();
 370
 371                                 if (!ret && (hostEnum == currentEnum) && (assemblyEnum != null)) {
 372                                         currentEnum = assemblyEnum;
 373                                         ret = assemblyEnum.MoveNext ();
 374                                 }
 375
 376                                 return ret;
 377                         }
 378
 379                         public void Reset ()
 380                         {
 381                                 if (hostEnum != null) {
 382                                         hostEnum.Reset ();
 383                                         currentEnum = hostEnum;
 384                                 } else {
 385                                         currentEnum = assemblyEnum;
 386                                 }
 387                                 if (assemblyEnum != null)
 388                                         assemblyEnum.Reset ();
 389                         }
 390
 391                         public object Current {
 392                                 get {
 393                                         return currentEnum.Current;
 394                                 }
 395                         }
 396                 }
 397         }
 398 }
 399