mcs/class/System/System.Net/ServicePointManager.cs

   1 //
   2 // System.Net.ServicePointManager
   3 //
   4 // Authors:
   5 //   Lawrence Pit (loz@cable.a2000.nl)
   6 //   Gonzalo Paniagua Javier (gonzalo@novell.com)
   7 //
   8 // Copyright (c) 2003-2010 Novell, Inc (http://www.novell.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 #if SECURITY_DEP
  33
  34 extern alias MonoSecurity;
  35
  36 using System.Text.RegularExpressions;
  37 using MonoSecurity::Mono.Security.X509.Extensions;
  38 using MonoSecurity::Mono.Security.Protocol.Tls;
  39 using MSX = MonoSecurity::Mono.Security.X509;
  40 #endif
  41
  42 using System;
  43 using System.Collections;
  44 using System.Collections.Specialized;
  45 using System.Configuration;
  46 using System.Net.Configuration;
  47 using System.Security.Cryptography.X509Certificates;
  48
  49 using System.Globalization;
  50 using System.Net.Security;
  51
  52 //
  53 // notes:
  54 // A service point manager manages service points (duh!).
  55 // A service point maintains a list of connections (per scheme + authority).
  56 // According to HttpWebRequest.ConnectionGroupName each connection group
  57 // creates additional connections. therefor, a service point has a hashtable
  58 // of connection groups where each value is a list of connections.
  59 //
  60 // when we need to make an HttpWebRequest, we need to do the following:
  61 // 1. find service point, given Uri and Proxy
  62 // 2. find connection group, given service point and group name
  63 // 3. find free connection in connection group, or create one (if ok due to limits)
  64 // 4. lease connection
  65 // 5. execute request
  66 // 6. when finished, return connection
  67 //
  68
  69
  70 namespace System.Net
  71 {
  72         public class ServicePointManager {
  73                 class SPKey {
  74                         Uri uri; // schema/host/port
  75                         bool use_connect;
  76
  77                         public SPKey (Uri uri, bool use_connect) {
  78                                 this.uri = uri;
  79                                 this.use_connect = use_connect;
  80                         }
  81
  82                         public Uri Uri {
  83                                 get { return uri; }
  84                         }
  85
  86                         public bool UseConnect {
  87                                 get { return use_connect; }
  88                         }
  89
  90                         public override int GetHashCode () {
  91                                 return uri.GetHashCode () + ((use_connect) ? 1 : 0);
  92                         }
  93
  94                         public override bool Equals (object obj) {
  95                                 SPKey other = obj as SPKey;
  96                                 if (obj == null) {
  97                                         return false;
  98                                 }
  99
 100                                 return (uri.Equals (other.uri) && other.use_connect == use_connect);
 101                         }
 102                 }
 103
 104                 private static HybridDictionary servicePoints = new HybridDictionary ();
 105
 106                 // Static properties
 107
 108                 private static ICertificatePolicy policy = new DefaultCertificatePolicy ();
 109                 private static int defaultConnectionLimit = DefaultPersistentConnectionLimit;
 110                 private static int maxServicePointIdleTime = 900000; // 15 minutes
 111                 private static int maxServicePoints = 0;
 112                 private static bool _checkCRL = false;
 113                 private static SecurityProtocolType _securityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls;
 114
 115 #if TARGET_JVM
 116                 static bool expectContinue = false;
 117 #else
 118                 static bool expectContinue = true;
 119 #endif
 120                 static bool useNagle;
 121                 static RemoteCertificateValidationCallback server_cert_cb;
 122                 static bool tcp_keepalive;
 123                 static int tcp_keepalive_time;
 124                 static int tcp_keepalive_interval;
 125
 126                 // Fields
 127
 128                 public const int DefaultNonPersistentConnectionLimit = 4;
 129 #if MONOTOUCH
 130                 public const int DefaultPersistentConnectionLimit = 10;
 131 #else
 132                 public const int DefaultPersistentConnectionLimit = 2;
 133 #endif
 134
 135 #if !NET_2_1
 136                 const string configKey = "system.net/connectionManagement";
 137                 static ConnectionManagementData manager;
 138 #endif
 139
 140                 static ServicePointManager ()
 141                 {
 142 #if !NET_2_1
 143 #if CONFIGURATION_DEP
 144                         object cfg = ConfigurationManager.GetSection (configKey);
 145                         ConnectionManagementSection s = cfg as ConnectionManagementSection;
 146                         if (s != null) {
 147                                 manager = new ConnectionManagementData (null);
 148                                 foreach (ConnectionManagementElement e in s.ConnectionManagement)
 149                                         manager.Add (e.Address, e.MaxConnection);
 150
 151                                 defaultConnectionLimit = (int) manager.GetMaxConnections ("*");
 152                                 return;
 153                         }
 154 #endif
 155                         manager = (ConnectionManagementData) ConfigurationSettings.GetConfig (configKey);
 156                         if (manager != null) {
 157                                 defaultConnectionLimit = (int) manager.GetMaxConnections ("*");
 158                         }
 159 #endif
 160                 }
 161
 162                 // Constructors
 163                 private ServicePointManager ()
 164                 {
 165                 }
 166
 167                 // Properties
 168
 169                 [Obsolete ("Use ServerCertificateValidationCallback instead", false)]
 170                 public static ICertificatePolicy CertificatePolicy {
 171                         get { return policy; }
 172                         set { policy = value; }
 173                 }
 174
 175                 [MonoTODO("CRL checks not implemented")]
 176                 public static bool CheckCertificateRevocationList {
 177                         get { return _checkCRL; }
 178                         set { _checkCRL = false; }      // TODO - don't yet accept true
 179                 }
 180
 181                 public static int DefaultConnectionLimit {
 182                         get { return defaultConnectionLimit; }
 183                         set {
 184                                 if (value <= 0)
 185                                         throw new ArgumentOutOfRangeException ("value");
 186
 187                                 defaultConnectionLimit = value;
 188 #if !NET_2_1
 189                 if (manager != null)
 190                                         manager.Add ("*", defaultConnectionLimit);
 191 #endif
 192                         }
 193                 }
 194
 195                 static Exception GetMustImplement ()
 196                 {
 197                         return new NotImplementedException ();
 198                 }
 199
 200                 [MonoTODO]
 201                 public static int DnsRefreshTimeout
 202                 {
 203                         get {
 204                                 throw GetMustImplement ();
 205                         }
 206                         set {
 207                                 throw GetMustImplement ();
 208                         }
 209                 }
 210
 211                 [MonoTODO]
 212                 public static bool EnableDnsRoundRobin
 213                 {
 214                         get {
 215                                 throw GetMustImplement ();
 216                         }
 217                         set {
 218                                 throw GetMustImplement ();
 219                         }
 220                 }
 221
 222                 public static int MaxServicePointIdleTime {
 223                         get {
 224                                 return maxServicePointIdleTime;
 225                         }
 226                         set {
 227                                 if (value < -2 || value > Int32.MaxValue)
 228                                         throw new ArgumentOutOfRangeException ("value");
 229                                 maxServicePointIdleTime = value;
 230                         }
 231                 }
 232
 233                 public static int MaxServicePoints {
 234                         get {
 235                                 return maxServicePoints;
 236                         }
 237                         set {
 238                                 if (value < 0)
 239                                         throw new ArgumentException ("value");
 240
 241                                 maxServicePoints = value;
 242                                 RecycleServicePoints ();
 243                         }
 244                 }
 245
 246 #if NET_1_0
 247                 // we need it for SslClientStream
 248                 internal
 249 #else
 250                 public
 251 #endif
 252                 static SecurityProtocolType SecurityProtocol {
 253                         get { return _securityProtocol; }
 254                         set { _securityProtocol = value; }
 255                 }
 256
 257                 public static RemoteCertificateValidationCallback ServerCertificateValidationCallback
 258                 {
 259                         get {
 260                                 return server_cert_cb;
 261                         }
 262                         set {
 263                                 server_cert_cb = value;
 264                         }
 265                 }
 266
 267                 public static bool Expect100Continue {
 268                         get { return expectContinue; }
 269                         set { expectContinue = value; }
 270                 }
 271
 272                 public static bool UseNagleAlgorithm {
 273                         get { return useNagle; }
 274                         set { useNagle = value; }
 275                 }
 276
 277                 // Methods
 278                 public static void SetTcpKeepAlive (bool enabled, int keepAliveTime, int keepAliveInterval)
 279                 {
 280                         if (enabled) {
 281                                 if (keepAliveTime <= 0)
 282                                         throw new ArgumentOutOfRangeException ("keepAliveTime", "Must be greater than 0");
 283                                 if (keepAliveInterval <= 0)
 284                                         throw new ArgumentOutOfRangeException ("keepAliveInterval", "Must be greater than 0");
 285                         }
 286
 287                         tcp_keepalive = enabled;
 288                         tcp_keepalive_time = keepAliveTime;
 289                         tcp_keepalive_interval = keepAliveInterval;
 290                 }
 291
 292                 public static ServicePoint FindServicePoint (Uri address)
 293                 {
 294                         return FindServicePoint (address, GlobalProxySelection.Select);
 295                 }
 296
 297                 public static ServicePoint FindServicePoint (string uriString, IWebProxy proxy)
 298                 {
 299                         return FindServicePoint (new Uri(uriString), proxy);
 300                 }
 301
 302                 public static ServicePoint FindServicePoint (Uri address, IWebProxy proxy)
 303                 {
 304                         if (address == null)
 305                                 throw new ArgumentNullException ("address");
 306
 307                         RecycleServicePoints ();
 308
 309                         var origAddress = new Uri (address.Scheme + "://" + address.Authority);
 310
 311                         bool usesProxy = false;
 312                         bool useConnect = false;
 313                         if (proxy != null && !proxy.IsBypassed(address)) {
 314                                 usesProxy = true;
 315                                 bool isSecure = address.Scheme == "https";
 316                                 address = proxy.GetProxy (address);
 317                                 if (address.Scheme != "http" && !isSecure)
 318                                         throw new NotSupportedException ("Proxy scheme not supported.");
 319
 320                                 if (isSecure && address.Scheme == "http")
 321                                         useConnect = true;
 322                         }
 323
 324                         address = new Uri (address.Scheme + "://" + address.Authority);
 325
 326                         ServicePoint sp = null;
 327                         lock (servicePoints) {
 328                                 SPKey key = new SPKey (origAddress, useConnect);
 329                                 sp = servicePoints [key] as ServicePoint;
 330                                 if (sp != null)
 331                                         return sp;
 332
 333                                 if (maxServicePoints > 0 && servicePoints.Count >= maxServicePoints)
 334                                         throw new InvalidOperationException ("maximum number of service points reached");
 335
 336                                 int limit;
 337 #if NET_2_1
 338                                 limit = defaultConnectionLimit;
 339 #else
 340                                 string addr = address.ToString ();
 341                                 limit = (int) manager.GetMaxConnections (addr);
 342 #endif
 343                                 sp = new ServicePoint (address, limit, maxServicePointIdleTime);
 344                                 sp.Expect100Continue = expectContinue;
 345                                 sp.UseNagleAlgorithm = useNagle;
 346                                 sp.UsesProxy = usesProxy;
 347                                 sp.UseConnect = useConnect;
 348                                 sp.SetTcpKeepAlive (tcp_keepalive, tcp_keepalive_time, tcp_keepalive_interval);
 349                                 servicePoints.Add (key, sp);
 350                         }
 351
 352                         return sp;
 353                 }
 354
 355                 // Internal Methods
 356
 357                 internal static void RecycleServicePoints ()
 358                 {
 359                         ArrayList toRemove = new ArrayList ();
 360                         lock (servicePoints) {
 361                                 IDictionaryEnumerator e = servicePoints.GetEnumerator ();
 362                                 while (e.MoveNext ()) {
 363                                         ServicePoint sp = (ServicePoint) e.Value;
 364                                         if (sp.AvailableForRecycling) {
 365                                                 toRemove.Add (e.Key);
 366                                         }
 367                                 }
 368
 369                                 for (int i = 0; i < toRemove.Count; i++)
 370                                         servicePoints.Remove (toRemove [i]);
 371
 372                                 if (maxServicePoints == 0 || servicePoints.Count <= maxServicePoints)
 373                                         return;
 374
 375                                 // get rid of the ones with the longest idle time
 376                                 SortedList list = new SortedList (servicePoints.Count);
 377                                 e = servicePoints.GetEnumerator ();
 378                                 while (e.MoveNext ()) {
 379                                         ServicePoint sp = (ServicePoint) e.Value;
 380                                         if (sp.CurrentConnections == 0) {
 381                                                 while (list.ContainsKey (sp.IdleSince))
 382                                                         sp.IdleSince = sp.IdleSince.AddMilliseconds (1);
 383                                                 list.Add (sp.IdleSince, sp.Address);
 384                                         }
 385                                 }
 386
 387                                 for (int i = 0; i < list.Count && servicePoints.Count > maxServicePoints; i++)
 388                                         servicePoints.Remove (list.GetByIndex (i));
 389                         }
 390                 }
 391 #if SECURITY_DEP
 392                 internal class ChainValidationHelper {
 393                         object sender;
 394                         string host;
 395
 396 #if !MONOTOUCH
 397                         static bool is_macosx = System.IO.File.Exists (OSX509Certificates.SecurityLibrary);
 398                         static X509RevocationMode revocation_mode;
 399
 400                         static ChainValidationHelper ()
 401                         {
 402                                 revocation_mode = X509RevocationMode.NoCheck;
 403                                 try {
 404                                         string str = Environment.GetEnvironmentVariable ("MONO_X509_REVOCATION_MODE");
 405                                         if (String.IsNullOrEmpty (str))
 406                                                 return;
 407                                         revocation_mode = (X509RevocationMode) Enum.Parse (typeof (X509RevocationMode), str, true);
 408                                 } catch {
 409                                 }
 410                         }
 411 #endif
 412
 413                         public ChainValidationHelper (object sender)
 414                         {
 415                                 this.sender = sender;
 416                         }
 417
 418                         public string Host {
 419                                 get {
 420                                         if (host == null && sender is HttpWebRequest)
 421                                                 host = ((HttpWebRequest) sender).Address.Host;
 422                                         return host;
 423                                 }
 424
 425                                 set { host = value; }
 426                         }
 427
 428                         // Used when the obsolete ICertificatePolicy is set to DefaultCertificatePolicy
 429                         // and the new ServerCertificateValidationCallback is not null
 430                         internal ValidationResult ValidateChain (MSX.X509CertificateCollection certs)
 431                         {
 432                                 // user_denied is true if the user callback is called and returns false
 433                                 bool user_denied = false;
 434                                 if (certs == null || certs.Count == 0)
 435                                         return null;
 436
 437                                 ICertificatePolicy policy = ServicePointManager.CertificatePolicy;
 438                                 RemoteCertificateValidationCallback cb = ServicePointManager.ServerCertificateValidationCallback;
 439
 440                                 X509Certificate2 leaf = new X509Certificate2 (certs [0].RawData);
 441                                 int status11 = 0; // Error code passed to the obsolete ICertificatePolicy callback
 442                                 SslPolicyErrors errors = 0;
 443                                 X509Chain chain = null;
 444                                 bool result = false;
 445 #if MONOTOUCH
 446                                 // The X509Chain is not really usable with MonoTouch (since the decision is not based on this data)
 447                                 // However if someone wants to override the results (good or bad) from iOS then they will want all
 448                                 // the certificates that the server provided (which generally does not include the root) so, only
 449                                 // if there's a user callback, we'll create the X509Chain but won't build it
 450                                 // ref: https://bugzilla.xamarin.com/show_bug.cgi?id=7245
 451                                 if (cb != null) {
 452 #endif
 453                                 chain = new X509Chain ();
 454                                 chain.ChainPolicy = new X509ChainPolicy ();
 455 #if !MONOTOUCH
 456                                 chain.ChainPolicy.RevocationMode = revocation_mode;
 457 #endif
 458                                 for (int i = 1; i < certs.Count; i++) {
 459                                         X509Certificate2 c2 = new X509Certificate2 (certs [i].RawData);
 460                                         chain.ChainPolicy.ExtraStore.Add (c2);
 461                                 }
 462 #if MONOTOUCH
 463                                 }
 464 #else
 465                                 try {
 466                                         if (!chain.Build (leaf))
 467                                                 errors |= GetErrorsFromChain (chain);
 468                                 } catch (Exception e) {
 469                                         Console.Error.WriteLine ("ERROR building certificate chain: {0}", e);
 470                                         Console.Error.WriteLine ("Please, report this problem to the Mono team");
 471                                         errors |= SslPolicyErrors.RemoteCertificateChainErrors;
 472                                 }
 473
 474                                 // for OSX and iOS we're using the native API to check for the SSL server policy and host names
 475                                 if (!is_macosx) {
 476                                         if (!CheckCertificateUsage (leaf)) {
 477                                                 errors |= SslPolicyErrors.RemoteCertificateChainErrors;
 478                                                 status11 = -2146762490; //CERT_E_PURPOSE 0x800B0106
 479                                         }
 480
 481                                         if (!CheckServerIdentity (certs [0], Host)) {
 482                                                 errors |= SslPolicyErrors.RemoteCertificateNameMismatch;
 483                                                 status11 = -2146762481; // CERT_E_CN_NO_MATCH 0x800B010F
 484                                         }
 485                                 } else {
 486 #endif
 487                                         // Attempt to use OSX certificates
 488                                         // Ideally we should return the SecTrustResult
 489                                         OSX509Certificates.SecTrustResult trustResult = OSX509Certificates.SecTrustResult.Deny;
 490                                         try {
 491                                                 trustResult = OSX509Certificates.TrustEvaluateSsl (certs, Host);
 492                                                 // We could use the other values of trustResult to pass this extra information
 493                                                 // to the .NET 2 callback for values like SecTrustResult.Confirm
 494                                                 result = (trustResult == OSX509Certificates.SecTrustResult.Proceed ||
 495                                                                   trustResult == OSX509Certificates.SecTrustResult.Unspecified);
 496                                         } catch {
 497                                                 // Ignore
 498                                         }
 499
 500                                         if (result) {
 501                                                 // TrustEvaluateSsl was successful so there's no trust error
 502                                                 // IOW we discard our own chain (since we trust OSX one instead)
 503                                                 errors = 0;
 504                                         } else {
 505                                                 // callback and DefaultCertificatePolicy needs this since 'result' is not specified
 506                                                 status11 = (int) trustResult;
 507                                                 errors |= SslPolicyErrors.RemoteCertificateChainErrors;
 508                                         }
 509 #if !MONOTOUCH
 510                                 }
 511 #endif
 512
 513 #if MONODROID
 514                                 result = AndroidPlatform.TrustEvaluateSsl (certs, sender, leaf, chain, errors);
 515                                 if (result) {
 516                                         // chain.Build() + GetErrorsFromChain() (above) will ALWAYS fail on
 517                                         // Android (there are no mozroots or preinstalled root certificates),
 518                                         // thus `errors` will ALWAYS have RemoteCertificateChainErrors.
 519                                         // Android just verified the chain; clear RemoteCertificateChainErrors.
 520                                         errors  &= ~SslPolicyErrors.RemoteCertificateChainErrors;
 521                                 }
 522 #endif
 523
 524                                 if (policy != null && (!(policy is DefaultCertificatePolicy) || cb == null)) {
 525                                         ServicePoint sp = null;
 526                                         HttpWebRequest req = sender as HttpWebRequest;
 527                                         if (req != null)
 528                                                 sp = req.ServicePointNoLock;
 529                                         if (status11 == 0 && errors != 0)
 530                                                 status11 = GetStatusFromChain (chain);
 531
 532                                         // pre 2.0 callback
 533                                         result = policy.CheckValidationResult (sp, leaf, req, status11);
 534                                         user_denied = !result && !(policy is DefaultCertificatePolicy);
 535                                 }
 536                                 // If there's a 2.0 callback, it takes precedence
 537                                 if (cb != null) {
 538                                         result = cb (sender, leaf, chain, errors);
 539                                         user_denied = !result;
 540                                 }
 541                                 return new ValidationResult (result, user_denied, status11);
 542                         }
 543
 544                         static int GetStatusFromChain (X509Chain chain)
 545                         {
 546                                 long result = 0;
 547                                 foreach (var status in chain.ChainStatus) {
 548                                         X509ChainStatusFlags flags = status.Status;
 549                                         if (flags == X509ChainStatusFlags.NoError)
 550                                                 continue;
 551
 552                                         // CERT_E_EXPIRED
 553                                         if ((flags & X509ChainStatusFlags.NotTimeValid) != 0) result = 0x800B0101;
 554                                         // CERT_E_VALIDITYPERIODNESTING
 555                                         else if ((flags & X509ChainStatusFlags.NotTimeNested) != 0) result = 0x800B0102;
 556                                         // CERT_E_REVOKED
 557                                         else if ((flags & X509ChainStatusFlags.Revoked) != 0) result = 0x800B010C;
 558                                         // TRUST_E_CERT_SIGNATURE
 559                                         else if ((flags & X509ChainStatusFlags.NotSignatureValid) != 0) result = 0x80096004;
 560                                         // CERT_E_WRONG_USAGE
 561                                         else if ((flags & X509ChainStatusFlags.NotValidForUsage) != 0) result = 0x800B0110;
 562                                         // CERT_E_UNTRUSTEDROOT
 563                                         else if ((flags & X509ChainStatusFlags.UntrustedRoot) != 0) result = 0x800B0109;
 564                                         // CRYPT_E_NO_REVOCATION_CHECK
 565                                         else if ((flags & X509ChainStatusFlags.RevocationStatusUnknown) != 0) result = 0x80092012;
 566                                         // CERT_E_CHAINING
 567                                         else if ((flags & X509ChainStatusFlags.Cyclic) != 0) result = 0x800B010A;
 568                                         // TRUST_E_FAIL - generic
 569                                         else if ((flags & X509ChainStatusFlags.InvalidExtension) != 0) result = 0x800B010B;
 570                                         // CERT_E_UNTRUSTEDROOT
 571                                         else if ((flags & X509ChainStatusFlags.InvalidPolicyConstraints) != 0) result = 0x800B010D;
 572                                         // TRUST_E_BASIC_CONSTRAINTS
 573                                         else if ((flags & X509ChainStatusFlags.InvalidBasicConstraints) != 0) result = 0x80096019;
 574                                         // CERT_E_INVALID_NAME
 575                                         else if ((flags & X509ChainStatusFlags.InvalidNameConstraints) != 0) result = 0x800B0114;
 576                                         // CERT_E_INVALID_NAME
 577                                         else if ((flags & X509ChainStatusFlags.HasNotSupportedNameConstraint) != 0) result = 0x800B0114;
 578                                         // CERT_E_INVALID_NAME
 579                                         else if ((flags & X509ChainStatusFlags.HasNotDefinedNameConstraint) != 0) result = 0x800B0114;
 580                                         // CERT_E_INVALID_NAME
 581                                         else if ((flags & X509ChainStatusFlags.HasNotPermittedNameConstraint) != 0) result = 0x800B0114;
 582                                         // CERT_E_INVALID_NAME
 583                                         else if ((flags & X509ChainStatusFlags.HasExcludedNameConstraint) != 0) result = 0x800B0114;
 584                                         // CERT_E_CHAINING
 585                                         else if ((flags & X509ChainStatusFlags.PartialChain) != 0) result = 0x800B010A;
 586                                         // CERT_E_EXPIRED
 587                                         else if ((flags & X509ChainStatusFlags.CtlNotTimeValid) != 0) result = 0x800B0101;
 588                                         // TRUST_E_CERT_SIGNATURE
 589                                         else if ((flags & X509ChainStatusFlags.CtlNotSignatureValid) != 0) result = 0x80096004;
 590                                         // CERT_E_WRONG_USAGE
 591                                         else if ((flags & X509ChainStatusFlags.CtlNotValidForUsage) != 0) result = 0x800B0110;
 592                                         // CRYPT_E_NO_REVOCATION_CHECK
 593                                         else if ((flags & X509ChainStatusFlags.OfflineRevocation) != 0) result = 0x80092012;
 594                                         // CERT_E_ISSUERCHAINING
 595                                         else if ((flags & X509ChainStatusFlags.NoIssuanceChainPolicy) != 0) result = 0x800B0107;
 596                                         else result = 0x800B010B; // TRUST_E_FAIL - generic
 597
 598                                         break; // Exit the loop on the first error
 599                                 }
 600                                 return (int) result;
 601                         }
 602 #if !MONOTOUCH
 603                         static SslPolicyErrors GetErrorsFromChain (X509Chain chain)
 604                         {
 605                                 SslPolicyErrors errors = SslPolicyErrors.None;
 606                                 foreach (var status in chain.ChainStatus) {
 607                                         if (status.Status == X509ChainStatusFlags.NoError)
 608                                                 continue;
 609                                         errors |= SslPolicyErrors.RemoteCertificateChainErrors;
 610                                         break;
 611                                 }
 612                                 return errors;
 613                         }
 614
 615                         static X509KeyUsageFlags s_flags = X509KeyUsageFlags.DigitalSignature  |
 616                                                         X509KeyUsageFlags.KeyAgreement |
 617                                                         X509KeyUsageFlags.KeyEncipherment;
 618                         // Adapted to System 2.0+ from TlsServerCertificate.cs
 619                         //------------------------------
 620                         // Note: this method only works for RSA certificates
 621                         // DH certificates requires some changes - does anyone use one ?
 622                         static bool CheckCertificateUsage (X509Certificate2 cert)
 623                         {
 624                                 try {
 625                                         // certificate extensions are required for this
 626                                         // we "must" accept older certificates without proofs
 627                                         if (cert.Version < 3)
 628                                                 return true;
 629
 630                                         X509KeyUsageExtension kux = (cert.Extensions ["2.5.29.15"] as X509KeyUsageExtension);
 631                                         X509EnhancedKeyUsageExtension eku = (cert.Extensions ["2.5.29.37"] as X509EnhancedKeyUsageExtension);
 632                                         if (kux != null && eku != null) {
 633                                                 // RFC3280 states that when both KeyUsageExtension and
 634                                                 // ExtendedKeyUsageExtension are present then BOTH should
 635                                                 // be valid
 636                                                 if ((kux.KeyUsages & s_flags) == 0)
 637                                                         return false;
 638                                                 return eku.EnhancedKeyUsages ["1.3.6.1.5.5.7.3.1"] != null ||
 639                                                         eku.EnhancedKeyUsages ["2.16.840.1.113730.4.1"] != null;
 640                                         } else if (kux != null) {
 641                                                 return ((kux.KeyUsages & s_flags) != 0);
 642                                         } else if (eku != null) {
 643                                                 // Server Authentication (1.3.6.1.5.5.7.3.1) or
 644                                                 // Netscape Server Gated Crypto (2.16.840.1.113730.4)
 645                                                 return eku.EnhancedKeyUsages ["1.3.6.1.5.5.7.3.1"] != null ||
 646                                                         eku.EnhancedKeyUsages ["2.16.840.1.113730.4.1"] != null;
 647                                         }
 648
 649                                         // last chance - try with older (deprecated) Netscape extensions
 650                                         X509Extension ext = cert.Extensions ["2.16.840.1.113730.1.1"];
 651                                         if (ext != null) {
 652                                                 string text = ext.NetscapeCertType (false);
 653                                                 return text.IndexOf ("SSL Server Authentication", StringComparison.Ordinal) != -1;
 654                                         }
 655                                         return true;
 656                                 } catch (Exception e) {
 657                                         Console.Error.WriteLine ("ERROR processing certificate: {0}", e);
 658                                         Console.Error.WriteLine ("Please, report this problem to the Mono team");
 659                                         return false;
 660                                 }
 661                         }
 662
 663                         // RFC2818 - HTTP Over TLS, Section 3.1
 664                         // http://www.ietf.org/rfc/rfc2818.txt
 665                         //
 666                         // 1.   if present MUST use subjectAltName dNSName as identity
 667                         // 1.1.         if multiples entries a match of any one is acceptable
 668                         // 1.2.         wildcard * is acceptable
 669                         // 2.   URI may be an IP address -> subjectAltName.iPAddress
 670                         // 2.1.         exact match is required
 671                         // 3.   Use of the most specific Common Name (CN=) in the Subject
 672                         // 3.1          Existing practice but DEPRECATED
 673                         static bool CheckServerIdentity (MSX.X509Certificate cert, string targetHost)
 674                         {
 675                                 try {
 676                                         MSX.X509Extension ext = cert.Extensions ["2.5.29.17"];
 677                                         // 1. subjectAltName
 678                                         if (ext != null) {
 679                                                 SubjectAltNameExtension subjectAltName = new SubjectAltNameExtension (ext);
 680                                                 // 1.1 - multiple dNSName
 681                                                 foreach (string dns in subjectAltName.DNSNames) {
 682                                                         // 1.2 TODO - wildcard support
 683                                                         if (Match (targetHost, dns))
 684                                                                 return true;
 685                                                 }
 686                                                 // 2. ipAddress
 687                                                 foreach (string ip in subjectAltName.IPAddresses) {
 688                                                         // 2.1. Exact match required
 689                                                         if (ip == targetHost)
 690                                                                 return true;
 691                                                 }
 692                                         }
 693                                         // 3. Common Name (CN=)
 694                                         return CheckDomainName (cert.SubjectName, targetHost);
 695                                 } catch (Exception e) {
 696                                         Console.Error.WriteLine ("ERROR processing certificate: {0}", e);
 697                                         Console.Error.WriteLine ("Please, report this problem to the Mono team");
 698                                         return false;
 699                                 }
 700                         }
 701
 702                         static bool CheckDomainName (string subjectName, string targetHost)
 703                         {
 704                                 string  domainName = String.Empty;
 705                                 Regex search = new Regex(@"CN\s*=\s*([^,]*)");
 706                                 MatchCollection elements = search.Matches(subjectName);
 707                                 if (elements.Count == 1) {
 708                                         if (elements[0].Success)
 709                                                 domainName = elements[0].Groups[1].Value.ToString();
 710                                 }
 711
 712                                 return Match (targetHost, domainName);
 713                         }
 714
 715                         // ensure the pattern is valid wrt to RFC2595 and RFC2818
 716                         // http://www.ietf.org/rfc/rfc2595.txt
 717                         // http://www.ietf.org/rfc/rfc2818.txt
 718                         static bool Match (string hostname, string pattern)
 719                         {
 720                                 // check if this is a pattern
 721                                 int index = pattern.IndexOf ('*');
 722                                 if (index == -1) {
 723                                         // not a pattern, do a direct case-insensitive comparison
 724                                         return (String.Compare (hostname, pattern, true, CultureInfo.InvariantCulture) == 0);
 725                                 }
 726
 727                                 // check pattern validity
 728                                 // A "*" wildcard character MAY be used as the left-most name component in the certificate.
 729
 730                                 // unless this is the last char (valid)
 731                                 if (index != pattern.Length - 1) {
 732                                         // then the next char must be a dot .'.
 733                                         if (pattern [index + 1] != '.')
 734                                                 return false;
 735                                 }
 736
 737                                 // only one (A) wildcard is supported
 738                                 int i2 = pattern.IndexOf ('*', index + 1);
 739                                 if (i2 != -1)
 740                                         return false;
 741
 742                                 // match the end of the pattern
 743                                 string end = pattern.Substring (index + 1);
 744                                 int length = hostname.Length - end.Length;
 745                                 // no point to check a pattern that is longer than the hostname
 746                                 if (length <= 0)
 747                                         return false;
 748
 749                                 if (String.Compare (hostname, length, end, 0, end.Length, true, CultureInfo.InvariantCulture) != 0)
 750                                         return false;
 751
 752                                 // special case, we start with the wildcard
 753                                 if (index == 0) {
 754                                         // ensure we hostname non-matched part (start) doesn't contain a dot
 755                                         int i3 = hostname.IndexOf ('.');
 756                                         return ((i3 == -1) || (i3 >= (hostname.Length - end.Length)));
 757                                 }
 758
 759                                 // match the start of the pattern
 760                                 string start = pattern.Substring (0, index);
 761                                 return (String.Compare (hostname, 0, start, 0, start.Length, true, CultureInfo.InvariantCulture) == 0);
 762                         }
 763 #endif
 764                 }
 765 #endif
 766         }
 767 }
 768