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

   1 //
   2 // System.Security.Policy.PolicyLevel.cs
   3 //
   4 // Authors:
   5 //      Nick Drochak (ndrochak@gol.com)
   6 //      Duncan Mak (duncan@ximian.com)
   7 //      Sebastien Pouliot  <sebastien@ximian.com>
   8 //
   9 // (C) 2001 Nick Drochak
  10 // (C) 2003 Duncan Mak, Ximian Inc.
  11 // Portions (C) 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 #if !MOONLIGHT
  35
  36 using System.Collections; // for IList
  37 using System.Globalization;
  38 using System.IO;
  39 using System.Reflection;
  40 using System.Runtime.InteropServices;
  41 using System.Security.Permissions;
  42
  43 using Mono.Xml;
  44
  45 namespace System.Security.Policy {
  46
  47         [Serializable]
  48         [ComVisible (true)]
  49         public sealed class PolicyLevel {
  50
  51                 string label;
  52                 CodeGroup root_code_group;
  53                 private ArrayList full_trust_assemblies;
  54                 private ArrayList named_permission_sets;
  55                 private string _location;
  56                 private PolicyLevelType _type;
  57                 private Hashtable fullNames;
  58                 private SecurityElement xml;
  59
  60                 internal PolicyLevel (string label, PolicyLevelType type)
  61                 {
  62                         this.label = label;
  63                         _type = type;
  64                         full_trust_assemblies = new ArrayList ();
  65                         named_permission_sets = new ArrayList ();
  66                 }
  67
  68                 internal void LoadFromFile (string filename)
  69                 {
  70                         try {
  71                                 // check for policy file
  72                                 if (!File.Exists (filename)) {
  73                                         // if it doesn't exist use the default configuration (like Fx 2.0)
  74                                         // ref: http://blogs.msdn.com/shawnfa/archive/2004/04/21/117833.aspx
  75                                         string defcfg = filename + ".default";
  76                                         if (File.Exists (defcfg)) {
  77                                                 // create policy from default file
  78                                                 File.Copy (defcfg, filename);
  79                                         }
  80                                 }
  81                                 // load security policy configuration
  82                                 if (File.Exists (filename)) {
  83                                         using (StreamReader sr = File.OpenText (filename)) {
  84                                                 xml = FromString (sr.ReadToEnd ());
  85                                         }
  86                                         try {
  87                                                 SecurityManager.ResolvingPolicyLevel = this;
  88                                                 FromXml (xml);
  89                                         }
  90                                         finally {
  91                                                 SecurityManager.ResolvingPolicyLevel = this;
  92                                         }
  93                                 } else {
  94                                         CreateDefaultFullTrustAssemblies ();
  95                                         CreateDefaultNamedPermissionSets ();
  96                                         CreateDefaultLevel (_type);
  97                                         Save ();
  98                                 }
  99                         }
 100                         catch {
 101                                 // this can fail in many ways including...
 102                                 // * can't lookup policy (path discovery);
 103                                 // * can't copy default file to policy
 104                                 // * can't read policy file;
 105                                 // * can't decode policy file
 106                                 // * can't save hardcoded policy to filename
 107                         }
 108                         finally {
 109                                 _location = filename;
 110                         }
 111                 }
 112
 113                 internal void LoadFromString (string xml)
 114                 {
 115                         FromXml (FromString (xml));
 116                 }
 117
 118                 private SecurityElement FromString (string xml)
 119                 {
 120                         SecurityParser parser = new SecurityParser ();
 121                         parser.LoadXml (xml);
 122                         // configuration / mscorlib / security / policy / PolicyLevel
 123                         SecurityElement configuration = parser.ToXml ();
 124                         if (configuration.Tag != "configuration")
 125                                 throw new ArgumentException (Locale.GetText ("missing <configuration> root element"));
 126                         SecurityElement mscorlib = (SecurityElement) configuration.Children [0];
 127                         if (mscorlib.Tag != "mscorlib")
 128                                 throw new ArgumentException (Locale.GetText ("missing <mscorlib> tag"));
 129                         SecurityElement security = (SecurityElement) mscorlib.Children [0];
 130                         if (security.Tag != "security")
 131                                 throw new ArgumentException (Locale.GetText ("missing <security> tag"));
 132                         SecurityElement policy = (SecurityElement) security.Children [0];
 133                         if (policy.Tag != "policy")
 134                                 throw new ArgumentException (Locale.GetText ("missing <policy> tag"));
 135                         SecurityElement policyLevel = (SecurityElement) policy.Children [0];
 136                         return policyLevel;
 137                 }
 138
 139                 // properties
 140
 141                 [Obsolete ("All GACed assemblies are now fully trusted and all permissions now succeed on fully trusted code.")]
 142                 public IList FullTrustAssemblies {
 143                         get { return full_trust_assemblies; }
 144                 }
 145
 146                 public string Label {
 147                         get { return label; }
 148                 }
 149
 150                 public IList NamedPermissionSets {
 151                         get { return named_permission_sets; }
 152                 }
 153
 154                 public CodeGroup RootCodeGroup {
 155                         get { return root_code_group; }
 156                         set {
 157                                 if (value == null)
 158                                         throw new ArgumentNullException ("value");
 159                                 root_code_group = value;
 160                         }
 161                 }
 162
 163                 public string StoreLocation {
 164                         get { return _location; }
 165                 }
 166
 167                 [ComVisible (false)]
 168                 public PolicyLevelType Type {
 169                         get { return _type; }
 170                 }
 171
 172                 // methods
 173
 174                 [Obsolete ("All GACed assemblies are now fully trusted and all permissions now succeed on fully trusted code.")]
 175                 public void AddFullTrustAssembly (StrongName sn)
 176                 {
 177                         if (sn == null)
 178                                 throw new ArgumentNullException ("sn");
 179
 180                         StrongNameMembershipCondition snMC = new StrongNameMembershipCondition(
 181                                 sn.PublicKey, sn.Name, sn.Version);
 182
 183                         AddFullTrustAssembly (snMC);
 184                 }
 185
 186                 [Obsolete ("All GACed assemblies are now fully trusted and all permissions now succeed on fully trusted code.")]
 187                 public void AddFullTrustAssembly (StrongNameMembershipCondition snMC)
 188                 {
 189                         if (snMC == null)
 190                                 throw new ArgumentNullException ("snMC");
 191
 192                         foreach (StrongNameMembershipCondition sn in full_trust_assemblies) {
 193                                 if (sn.Equals (snMC)) {
 194                                         throw new ArgumentException (Locale.GetText ("sn already has full trust."));
 195                                 }
 196                         }
 197                         full_trust_assemblies.Add (snMC);
 198                 }
 199
 200                 public void AddNamedPermissionSet (NamedPermissionSet permSet)
 201                 {
 202                         if (permSet == null)
 203                                 throw new ArgumentNullException ("permSet");
 204
 205                         foreach (NamedPermissionSet n in named_permission_sets) {
 206                                 if (permSet.Name == n.Name) {
 207                                         throw new ArgumentException (
 208                                                 Locale.GetText ("This NamedPermissionSet is the same an existing NamedPermissionSet."));
 209                                 }
 210                         }
 211                         named_permission_sets.Add (permSet.Copy ());
 212                 }
 213
 214                 public NamedPermissionSet ChangeNamedPermissionSet (string name, PermissionSet pSet)
 215                 {
 216                         if (name == null)
 217                                 throw new ArgumentNullException ("name");
 218                         if (pSet == null)
 219                                 throw new ArgumentNullException ("pSet");
 220                         if (DefaultPolicies.ReservedNames.IsReserved (name))
 221                                 throw new ArgumentException (Locale.GetText ("Reserved name"));
 222
 223                         foreach (NamedPermissionSet n in named_permission_sets) {
 224                                 if (name == n.Name) {
 225                                         named_permission_sets.Remove (n);
 226                                         AddNamedPermissionSet (new NamedPermissionSet (name, pSet));
 227                                         return n;
 228                                 }
 229                         }
 230                         throw new ArgumentException (Locale.GetText ("PermissionSet not found"));
 231                 }
 232
 233                 public static PolicyLevel CreateAppDomainLevel ()
 234                 {
 235                         UnionCodeGroup cg = new UnionCodeGroup (new AllMembershipCondition (), new PolicyStatement (DefaultPolicies.FullTrust));
 236                         cg.Name = "All_Code";
 237                         PolicyLevel pl = new PolicyLevel ("AppDomain", PolicyLevelType.AppDomain);
 238                         pl.RootCodeGroup = cg;
 239                         pl.Reset ();
 240                         return pl;
 241                 }
 242
 243
 244                 public void FromXml (SecurityElement e)
 245                 {
 246                         if (e == null)
 247                                 throw new ArgumentNullException ("e");
 248 // MS doesn't throw an exception for this case
 249 //                      if (e.Tag != "PolicyLevel")
 250 //                              throw new ArgumentException (Locale.GetText ("Invalid XML"));
 251
 252                         SecurityElement sc = e.SearchForChildByTag ("SecurityClasses");
 253                         if ((sc != null) && (sc.Children != null) && (sc.Children.Count > 0)) {
 254                                 fullNames = new Hashtable (sc.Children.Count);
 255                                 foreach (SecurityElement se in sc.Children) {
 256                                         fullNames.Add (se.Attributes ["Name"], se.Attributes ["Description"]);
 257                                 }
 258                         }
 259
 260                         SecurityElement fta = e.SearchForChildByTag ("FullTrustAssemblies");
 261                         if ((fta != null) && (fta.Children != null) && (fta.Children.Count > 0)) {
 262                                 full_trust_assemblies.Clear ();
 263                                 foreach (SecurityElement se in fta.Children) {
 264                                         if (se.Tag != "IMembershipCondition")
 265                                                 throw new ArgumentException (Locale.GetText ("Invalid XML"));
 266                                         string className = se.Attribute ("class");
 267                                         if (className.IndexOf ("StrongNameMembershipCondition") < 0)
 268                                                 throw new ArgumentException (Locale.GetText ("Invalid XML - must be StrongNameMembershipCondition"));
 269                                         // we directly use StrongNameMembershipCondition
 270                                         full_trust_assemblies.Add (new StrongNameMembershipCondition (se));
 271                                 }
 272                         }
 273
 274                         SecurityElement cg = e.SearchForChildByTag ("CodeGroup");
 275                         if ((cg != null) && (cg.Children != null) && (cg.Children.Count > 0)) {
 276                                 root_code_group = CodeGroup.CreateFromXml (cg, this);
 277                         } else {
 278                                 throw new ArgumentException (Locale.GetText ("Missing Root CodeGroup"));
 279                         }
 280
 281                         SecurityElement nps = e.SearchForChildByTag ("NamedPermissionSets");
 282                         if ((nps != null) && (nps.Children != null) && (nps.Children.Count > 0)) {
 283                                 named_permission_sets.Clear ();
 284                                 foreach (SecurityElement se in nps.Children) {
 285                                         NamedPermissionSet n = new NamedPermissionSet ();
 286                                         n.Resolver = this;
 287                                         n.FromXml (se);
 288                                         named_permission_sets.Add (n);
 289                                 }
 290                         }
 291                 }
 292
 293                 public NamedPermissionSet GetNamedPermissionSet (string name)
 294                 {
 295                         if (name == null)
 296                                 throw new ArgumentNullException ("name");
 297
 298                         foreach (NamedPermissionSet n in named_permission_sets) {
 299                                 if (n.Name == name)
 300                                         return (NamedPermissionSet) n.Copy ();
 301                         }
 302                         return null;
 303                 }
 304
 305                 public void Recover ()
 306                 {
 307                         if (_location == null) {
 308                                 string msg = Locale.GetText ("Only file based policies may be recovered.");
 309                                 throw new PolicyException (msg);
 310                         }
 311
 312                         string backup = _location + ".backup";
 313                         if (!File.Exists (backup)) {
 314                                 string msg = Locale.GetText ("No policy backup exists.");
 315                                 throw new PolicyException (msg);
 316                         }
 317
 318                         try {
 319                                 File.Copy (backup, _location, true);
 320                         }
 321                         catch (Exception e) {
 322                                 string msg = Locale.GetText ("Couldn't replace the policy file with it's backup.");
 323                                 throw new PolicyException (msg, e);
 324                         }
 325                 }
 326
 327                 [Obsolete ("All GACed assemblies are now fully trusted and all permissions now succeed on fully trusted code.")]
 328                 public void RemoveFullTrustAssembly (StrongName sn)
 329                 {
 330                         if (sn == null)
 331                                 throw new ArgumentNullException ("sn");
 332
 333                         StrongNameMembershipCondition s = new StrongNameMembershipCondition (sn.PublicKey, sn.Name, sn.Version);
 334                         RemoveFullTrustAssembly (s);
 335                 }
 336
 337                 [Obsolete ("All GACed assemblies are now fully trusted and all permissions now succeed on fully trusted code.")]
 338                 public void RemoveFullTrustAssembly (StrongNameMembershipCondition snMC)
 339                 {
 340                         if (snMC == null)
 341                                 throw new ArgumentNullException ("snMC");
 342
 343                         if (((IList) full_trust_assemblies).Contains (snMC))
 344                                 ((IList) full_trust_assemblies).Remove (snMC);
 345
 346                         else
 347                                 throw new ArgumentException (
 348                                         Locale.GetText ("sn does not have full trust."));
 349                 }
 350
 351                 public NamedPermissionSet RemoveNamedPermissionSet (NamedPermissionSet permSet)
 352                 {
 353                         if (permSet == null)
 354                                 throw new ArgumentNullException ("permSet");
 355
 356                         return RemoveNamedPermissionSet (permSet.Name);
 357                 }
 358
 359                 public NamedPermissionSet RemoveNamedPermissionSet (string name)
 360                 {
 361                         if (name == null)
 362                                 throw new ArgumentNullException ("name");
 363                         if (DefaultPolicies.ReservedNames.IsReserved (name))
 364                                 throw new ArgumentException (Locale.GetText ("Reserved name"));
 365
 366                         foreach (NamedPermissionSet nps in named_permission_sets) {
 367                                 if (name == nps.Name) {
 368                                         named_permission_sets.Remove (nps);
 369                                         return nps;
 370                                 }
 371                         }
 372                         string msg = String.Format (Locale.GetText ("Name '{0}' cannot be found."), name);
 373                         throw new ArgumentException (msg, "name");
 374                 }
 375
 376                 public void Reset ()
 377                 {
 378                         if (fullNames != null)
 379                                 fullNames.Clear ();
 380
 381                         if (_type != PolicyLevelType.AppDomain) {
 382                                 full_trust_assemblies.Clear ();
 383                                 named_permission_sets.Clear ();
 384
 385                                 // because the policy doesn't exist LoadFromFile will try to
 386                                 // 1. use the .default file if existing (like Fx 2.0 does); or
 387                                 // 2. use the hard-coded default values
 388                                 // and recreate a policy file
 389                                 if ((_location != null) && (File.Exists (_location))) {
 390                                         try {
 391                                                 File.Delete (_location);
 392                                         }
 393                                         catch {}
 394                                 }
 395                                 LoadFromFile (_location);
 396                         } else {
 397                                 CreateDefaultFullTrustAssemblies ();
 398                                 CreateDefaultNamedPermissionSets ();
 399                         }
 400                 }
 401
 402                 public PolicyStatement Resolve (Evidence evidence)
 403                 {
 404                         if (evidence == null)
 405                                 throw new ArgumentNullException ("evidence");
 406
 407                         PolicyStatement ps = root_code_group.Resolve (evidence);
 408                         return ((ps != null) ? ps : PolicyStatement.Empty ());
 409                 }
 410
 411                 public CodeGroup ResolveMatchingCodeGroups (Evidence evidence)
 412                 {
 413                         if (evidence == null)
 414                                 throw new ArgumentNullException ("evidence");
 415
 416                         CodeGroup cg = root_code_group.ResolveMatchingCodeGroups (evidence);
 417                         return ((cg != null) ? cg : null);
 418                 }
 419
 420                 public SecurityElement ToXml ()
 421                 {
 422                         Hashtable fullNames = new Hashtable ();
 423                         // only StrongNameMembershipCondition so no need to loop
 424                         if (full_trust_assemblies.Count > 0) {
 425                                 if (!fullNames.Contains ("StrongNameMembershipCondition")) {
 426                                         fullNames.Add ("StrongNameMembershipCondition", typeof (StrongNameMembershipCondition).FullName);
 427                                 }
 428                         }
 429
 430                         SecurityElement namedPSs = new SecurityElement ("NamedPermissionSets");
 431                         foreach (NamedPermissionSet nps in named_permission_sets) {
 432                                 SecurityElement se = nps.ToXml ();
 433                                 object objectClass = se.Attributes ["class"];
 434                                 if (!fullNames.Contains (objectClass)) {
 435                                         fullNames.Add (objectClass, nps.GetType ().FullName);
 436                                 }
 437                                 namedPSs.AddChild (se);
 438                         }
 439
 440                         SecurityElement fta = new SecurityElement ("FullTrustAssemblies");
 441                         foreach (StrongNameMembershipCondition snmc in full_trust_assemblies) {
 442                                 fta.AddChild (snmc.ToXml (this));
 443                         }
 444
 445                         SecurityElement security_classes = new SecurityElement ("SecurityClasses");
 446                         if (fullNames.Count > 0) {
 447                                 foreach (DictionaryEntry de in fullNames) {
 448                                         SecurityElement sc = new SecurityElement ("SecurityClass");
 449                                         sc.AddAttribute ("Name", (string)de.Key);
 450                                         sc.AddAttribute ("Description", (string)de.Value);
 451                                         security_classes.AddChild (sc);
 452                                 }
 453                         }
 454
 455                         SecurityElement element = new SecurityElement (typeof (System.Security.Policy.PolicyLevel).Name);
 456                         element.AddAttribute ("version", "1");
 457                         element.AddChild (security_classes);
 458                         element.AddChild (namedPSs);
 459                         if (root_code_group != null) {
 460                                 element.AddChild (root_code_group.ToXml (this));
 461                         }
 462                         element.AddChild (fta);
 463
 464                         return element;
 465                 }
 466
 467                 // internal stuff
 468
 469                 // NOTE: Callers are expected to check for ControlPolicy
 470                 internal void Save ()
 471                 {
 472                         if (_type == PolicyLevelType.AppDomain) {
 473                                 throw new PolicyException (Locale.GetText (
 474                                         "Can't save AppDomain PolicyLevel"));
 475                         }
 476
 477                         if (_location != null) {
 478                                 try {
 479                                         if (File.Exists (_location)) {
 480                                                 File.Copy (_location, _location + ".backup", true);
 481                                         }
 482                                 }
 483                                 catch (Exception) {
 484                                 }
 485                                 finally {
 486                                         using (StreamWriter sw = new StreamWriter (_location)) {
 487                                                 sw.Write (ToXml ().ToString ());
 488                                                 sw.Close ();
 489                                         }
 490                                 }
 491                         }
 492                 }
 493
 494                 // Hardcode defaults in case
 495                 // (a) the specified policy file doesn't exists; and
 496                 // (b) no corresponding default policy file exists
 497                 internal void CreateDefaultLevel (PolicyLevelType type)
 498                 {
 499                         PolicyStatement psu = new PolicyStatement (DefaultPolicies.FullTrust);
 500
 501                         switch (type) {
 502                         case PolicyLevelType.Machine:
 503                                 // by default all stuff is in the machine policy...
 504                                 PolicyStatement psn = new PolicyStatement (DefaultPolicies.Nothing);
 505                                 root_code_group = new UnionCodeGroup (new AllMembershipCondition (), psn);
 506                                 root_code_group.Name = "All_Code";
 507
 508                                 UnionCodeGroup myComputerZone = new UnionCodeGroup (new ZoneMembershipCondition (SecurityZone.MyComputer), psu);
 509                                 myComputerZone.Name = "My_Computer_Zone";
 510                                 // TODO: strongname code group for ECMA and MS keys
 511                                 root_code_group.AddChild (myComputerZone);
 512
 513                                 UnionCodeGroup localIntranetZone = new UnionCodeGroup (new ZoneMembershipCondition (SecurityZone.Intranet),
 514                                         new PolicyStatement (DefaultPolicies.LocalIntranet));
 515                                 localIntranetZone.Name = "LocalIntranet_Zone";
 516                                 // TODO: same site / same directory
 517                                 root_code_group.AddChild (localIntranetZone);
 518
 519                                 PolicyStatement psi = new PolicyStatement (DefaultPolicies.Internet);
 520                                 UnionCodeGroup internetZone = new UnionCodeGroup (new ZoneMembershipCondition (SecurityZone.Internet), psi);
 521                                 internetZone.Name = "Internet_Zone";
 522                                 // TODO: same site
 523                                 root_code_group.AddChild (internetZone);
 524
 525                                 UnionCodeGroup restrictedZone = new UnionCodeGroup (new ZoneMembershipCondition (SecurityZone.Untrusted), psn);
 526                                 restrictedZone.Name = "Restricted_Zone";
 527                                 root_code_group.AddChild (restrictedZone);
 528
 529                                 UnionCodeGroup trustedZone = new UnionCodeGroup (new ZoneMembershipCondition (SecurityZone.Trusted), psi);
 530                                 trustedZone.Name = "Trusted_Zone";
 531                                 // TODO: same site
 532                                 root_code_group.AddChild (trustedZone);
 533                                 break;
 534                         case PolicyLevelType.User:
 535                         case PolicyLevelType.Enterprise:
 536                         case PolicyLevelType.AppDomain:
 537                                 // while the other policies don't restrict anything
 538                                 root_code_group = new UnionCodeGroup (new AllMembershipCondition (), psu);
 539                                 root_code_group.Name = "All_Code";
 540                                 break;
 541                         }
 542                 }
 543
 544                 internal void CreateDefaultFullTrustAssemblies ()
 545                 {
 546                         // (default) assemblies that are fully trusted during policy resolution
 547                         full_trust_assemblies.Clear ();
 548                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("mscorlib", DefaultPolicies.Key.Ecma));
 549                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System", DefaultPolicies.Key.Ecma));
 550                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System.Data", DefaultPolicies.Key.Ecma));
 551                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System.DirectoryServices", DefaultPolicies.Key.MsFinal));
 552                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System.Drawing", DefaultPolicies.Key.MsFinal));
 553                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System.Messaging", DefaultPolicies.Key.MsFinal));
 554                         full_trust_assemblies.Add (DefaultPolicies.FullTrustMembership ("System.ServiceProcess", DefaultPolicies.Key.MsFinal));
 555                 }
 556
 557                 internal void CreateDefaultNamedPermissionSets ()
 558                 {
 559                         named_permission_sets.Clear ();
 560                         try {
 561                                 SecurityManager.ResolvingPolicyLevel = this;
 562                                 named_permission_sets.Add (DefaultPolicies.LocalIntranet);
 563                                 named_permission_sets.Add (DefaultPolicies.Internet);
 564                                 named_permission_sets.Add (DefaultPolicies.SkipVerification);
 565                                 named_permission_sets.Add (DefaultPolicies.Execution);
 566                                 named_permission_sets.Add (DefaultPolicies.Nothing);
 567                                 named_permission_sets.Add (DefaultPolicies.Everything);
 568                                 named_permission_sets.Add (DefaultPolicies.FullTrust);
 569                         }
 570                         finally {
 571                                 SecurityManager.ResolvingPolicyLevel = null;
 572                         }
 573                 }
 574
 575                 internal string ResolveClassName (string className)
 576                 {
 577                         if (fullNames != null) {
 578                                 object name = fullNames [className];
 579                                 if (name != null)
 580                                         return (string) name;
 581                         }
 582                         return className;
 583                 }
 584
 585                 internal bool IsFullTrustAssembly (Assembly a)
 586                 {
 587                         AssemblyName an = a.UnprotectedGetName ();
 588                         StrongNamePublicKeyBlob snpkb = new StrongNamePublicKeyBlob (an.GetPublicKey ());
 589                         StrongNameMembershipCondition snMC = new StrongNameMembershipCondition (snpkb, an.Name, an.Version);
 590                         foreach (StrongNameMembershipCondition sn in full_trust_assemblies) {
 591                                 if (sn.Equals (snMC)) {
 592                                         return true;
 593                                 }
 594                         }
 595                         return false;
 596                 }
 597         }
 598 }
 599
 600 #endif
 601