mcs/class/System/System.Net/HttpConnection.cs

   1 //
   2 // System.Net.HttpConnection
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo.mono@gmail.com)
   6 //
   7 // Copyright (c) 2005-2009 Novell, Inc. (http://www.novell.com)
   8 // Copyright (c) 2012 Xamarin, Inc. (http://xamarin.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 #if SECURITY_DEP
  31
  32 extern alias MonoSecurity;
  33
  34 using System.IO;
  35 using System.Net.Sockets;
  36 using System.Reflection;
  37 using System.Text;
  38 using System.Threading;
  39 using System.Security.Cryptography;
  40 using System.Security.Cryptography.X509Certificates;
  41 using MonoSecurity::Mono.Security.Protocol.Tls;
  42
  43 namespace System.Net {
  44         sealed class HttpConnection
  45         {
  46                 static AsyncCallback onread_cb = new AsyncCallback (OnRead);
  47                 const int BufferSize = 8192;
  48                 Socket sock;
  49                 Stream stream;
  50                 EndPointListener epl;
  51                 MemoryStream ms;
  52                 byte [] buffer;
  53                 HttpListenerContext context;
  54                 StringBuilder current_line;
  55                 ListenerPrefix prefix;
  56                 RequestStream i_stream;
  57                 ResponseStream o_stream;
  58                 bool chunked;
  59                 int reuses;
  60                 bool context_bound;
  61                 bool secure;
  62                 AsymmetricAlgorithm key;
  63                 int s_timeout = 90000; // 90k ms for first request, 15k ms from then on
  64                 Timer timer;
  65                 IPEndPoint local_ep;
  66                 HttpListener last_listener;
  67                 int [] client_cert_errors;
  68                 X509Certificate2 client_cert;
  69
  70                 public HttpConnection (Socket sock, EndPointListener epl, bool secure, X509Certificate2 cert, AsymmetricAlgorithm key)
  71                 {
  72                         this.sock = sock;
  73                         this.epl = epl;
  74                         this.secure = secure;
  75                         this.key = key;
  76                         if (secure == false) {
  77                                 stream = new NetworkStream (sock, false);
  78                         } else {
  79                                 SslServerStream ssl_stream = new SslServerStream (new NetworkStream (sock, false), cert, false, true, false);
  80                                 ssl_stream.PrivateKeyCertSelectionDelegate += OnPVKSelection;
  81                                 ssl_stream.ClientCertValidationDelegate += OnClientCertificateValidation;
  82                                 stream = ssl_stream;
  83                         }
  84                         timer = new Timer (OnTimeout, null, Timeout.Infinite, Timeout.Infinite);
  85                         Init ();
  86                 }
  87
  88                 internal int [] ClientCertificateErrors {
  89                         get { return client_cert_errors; }
  90                 }
  91
  92                 internal X509Certificate2 ClientCertificate {
  93                         get { return client_cert; }
  94                 }
  95
  96                 bool OnClientCertificateValidation (X509Certificate certificate, int[] errors)
  97                 {
  98                         if (certificate == null)
  99                                 return true;
 100                         X509Certificate2 cert = certificate as X509Certificate2;
 101                         if (cert == null)
 102                                 cert = new X509Certificate2 (certificate.GetRawCertData ());
 103                         client_cert = cert;
 104                         client_cert_errors = errors;
 105                         return true;
 106                 }
 107
 108                 AsymmetricAlgorithm OnPVKSelection (X509Certificate certificate, string targetHost)
 109                 {
 110                         return key;
 111                 }
 112
 113                 void Init ()
 114                 {
 115                         context_bound = false;
 116                         i_stream = null;
 117                         o_stream = null;
 118                         prefix = null;
 119                         chunked = false;
 120                         ms = new MemoryStream ();
 121                         position = 0;
 122                         input_state = InputState.RequestLine;
 123                         line_state = LineState.None;
 124                         context = new HttpListenerContext (this);
 125                 }
 126
 127                 public bool IsClosed {
 128                         get { return (sock == null); }
 129                 }
 130
 131                 public int Reuses {
 132                         get { return reuses; }
 133                 }
 134
 135                 public IPEndPoint LocalEndPoint {
 136                         get {
 137                                 if (local_ep != null)
 138                                         return local_ep;
 139
 140                                 local_ep = (IPEndPoint) sock.LocalEndPoint;
 141                                 return local_ep;
 142                         }
 143                 }
 144
 145                 public IPEndPoint RemoteEndPoint {
 146                         get { return (IPEndPoint) sock.RemoteEndPoint; }
 147                 }
 148
 149                 public bool IsSecure {
 150                         get { return secure; }
 151                 }
 152
 153                 public ListenerPrefix Prefix {
 154                         get { return prefix; }
 155                         set { prefix = value; }
 156                 }
 157
 158                 void OnTimeout (object unused)
 159                 {
 160                         CloseSocket ();
 161                         Unbind ();
 162                 }
 163
 164                 public void BeginReadRequest ()
 165                 {
 166                         if (buffer == null)
 167                                 buffer = new byte [BufferSize];
 168                         try {
 169                                 if (reuses == 1)
 170                                         s_timeout = 15000;
 171                                 timer.Change (s_timeout, Timeout.Infinite);
 172                                 stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 173                         } catch {
 174                                 timer.Change (Timeout.Infinite, Timeout.Infinite);
 175                                 CloseSocket ();
 176                                 Unbind ();
 177                         }
 178                 }
 179
 180                 public RequestStream GetRequestStream (bool chunked, long contentlength)
 181                 {
 182                         if (i_stream == null) {
 183                                 byte [] buffer = ms.GetBuffer ();
 184                                 int length = (int) ms.Length;
 185                                 ms = null;
 186                                 if (chunked) {
 187                                         this.chunked = true;
 188                                         context.Response.SendChunked = true;
 189                                         i_stream = new ChunkedInputStream (context, stream, buffer, position, length - position);
 190                                 } else {
 191                                         i_stream = new RequestStream (stream, buffer, position, length - position, contentlength);
 192                                 }
 193                         }
 194                         return i_stream;
 195                 }
 196
 197                 public ResponseStream GetResponseStream ()
 198                 {
 199                         // TODO: can we get this stream before reading the input?
 200                         if (o_stream == null) {
 201                                 HttpListener listener = context.Listener;
 202                                 bool ign = (listener == null) ? true : listener.IgnoreWriteExceptions;
 203                                 o_stream = new ResponseStream (stream, context.Response, ign);
 204                         }
 205                         return o_stream;
 206                 }
 207
 208                 static void OnRead (IAsyncResult ares)
 209                 {
 210                         HttpConnection cnc = (HttpConnection) ares.AsyncState;
 211                         cnc.OnReadInternal (ares);
 212                 }
 213
 214                 void OnReadInternal (IAsyncResult ares)
 215                 {
 216                         timer.Change (Timeout.Infinite, Timeout.Infinite);
 217                         int nread = -1;
 218                         try {
 219                                 nread = stream.EndRead (ares);
 220                                 ms.Write (buffer, 0, nread);
 221                                 if (ms.Length > 32768) {
 222                                         SendError ("Bad request", 400);
 223                                         Close (true);
 224                                         return;
 225                                 }
 226                         } catch {
 227                                 if (ms != null && ms.Length > 0)
 228                                         SendError ();
 229                                 if (sock != null) {
 230                                         CloseSocket ();
 231                                         Unbind ();
 232                                 }
 233                                 return;
 234                         }
 235
 236                         if (nread == 0) {
 237                                 //if (ms.Length > 0)
 238                                 //      SendError (); // Why bother?
 239                                 CloseSocket ();
 240                                 Unbind ();
 241                                 return;
 242                         }
 243
 244                         if (ProcessInput (ms)) {
 245                                 if (!context.HaveError)
 246                                         context.Request.FinishInitialization ();
 247
 248                                 if (context.HaveError) {
 249                                         SendError ();
 250                                         Close (true);
 251                                         return;
 252                                 }
 253
 254                                 if (!epl.BindContext (context)) {
 255                                         SendError ("Invalid host", 400);
 256                                         Close (true);
 257                                         return;
 258                                 }
 259                                 HttpListener listener = context.Listener;
 260                                 if (last_listener != listener) {
 261                                         RemoveConnection ();
 262                                         listener.AddConnection (this);
 263                                         last_listener = listener;
 264                                 }
 265
 266                                 context_bound = true;
 267                                 listener.RegisterContext (context);
 268                                 return;
 269                         }
 270                         stream.BeginRead (buffer, 0, BufferSize, onread_cb, this);
 271                 }
 272
 273                 void RemoveConnection ()
 274                 {
 275                         if (last_listener == null)
 276                                 epl.RemoveConnection (this);
 277                         else
 278                                 last_listener.RemoveConnection (this);
 279                 }
 280
 281                 enum InputState {
 282                         RequestLine,
 283                         Headers
 284                 }
 285
 286                 enum LineState {
 287                         None,
 288                         CR,
 289                         LF
 290                 }
 291
 292                 InputState input_state = InputState.RequestLine;
 293                 LineState line_state = LineState.None;
 294                 int position;
 295
 296                 // true -> done processing
 297                 // false -> need more input
 298                 bool ProcessInput (MemoryStream ms)
 299                 {
 300                         byte [] buffer = ms.GetBuffer ();
 301                         int len = (int) ms.Length;
 302                         int used = 0;
 303                         string line;
 304
 305                         try {
 306                                 line = ReadLine (buffer, position, len - position, ref used);
 307                                 position += used;
 308                         } catch {
 309                                 context.ErrorMessage = "Bad request";
 310                                 context.ErrorStatus = 400;
 311                                 return true;
 312                         }
 313
 314                         do {
 315                                 if (line == null)
 316                                         break;
 317                                 if (line == "") {
 318                                         if (input_state == InputState.RequestLine)
 319                                                 continue;
 320                                         current_line = null;
 321                                         ms = null;
 322                                         return true;
 323                                 }
 324
 325                                 if (input_state == InputState.RequestLine) {
 326                                         context.Request.SetRequestLine (line);
 327                                         input_state = InputState.Headers;
 328                                 } else {
 329                                         try {
 330                                                 context.Request.AddHeader (line);
 331                                         } catch (Exception e) {
 332                                                 context.ErrorMessage = e.Message;
 333                                                 context.ErrorStatus = 400;
 334                                                 return true;
 335                                         }
 336                                 }
 337
 338                                 if (context.HaveError)
 339                                         return true;
 340
 341                                 if (position >= len)
 342                                         break;
 343                                 try {
 344                                         line = ReadLine (buffer, position, len - position, ref used);
 345                                         position += used;
 346                                 } catch {
 347                                         context.ErrorMessage = "Bad request";
 348                                         context.ErrorStatus = 400;
 349                                         return true;
 350                                 }
 351                         } while (line != null);
 352
 353                         if (used == len) {
 354                                 ms.SetLength (0);
 355                                 position = 0;
 356                         }
 357                         return false;
 358                 }
 359
 360                 string ReadLine (byte [] buffer, int offset, int len, ref int used)
 361                 {
 362                         if (current_line == null)
 363                                 current_line = new StringBuilder (128);
 364                         int last = offset + len;
 365                         used = 0;
 366                         for (int i = offset; i < last && line_state != LineState.LF; i++) {
 367                                 used++;
 368                                 byte b = buffer [i];
 369                                 if (b == 13) {
 370                                         line_state = LineState.CR;
 371                                 } else if (b == 10) {
 372                                         line_state = LineState.LF;
 373                                 } else {
 374                                         current_line.Append ((char) b);
 375                                 }
 376                         }
 377
 378                         string result = null;
 379                         if (line_state == LineState.LF) {
 380                                 line_state = LineState.None;
 381                                 result = current_line.ToString ();
 382                                 current_line.Length = 0;
 383                         }
 384
 385                         return result;
 386                 }
 387
 388                 public void SendError (string msg, int status)
 389                 {
 390                         try {
 391                                 HttpListenerResponse response = context.Response;
 392                                 response.StatusCode = status;
 393                                 response.ContentType = "text/html";
 394                                 string description = HttpListenerResponse.GetStatusDescription (status);
 395                                 string str;
 396                                 if (msg != null)
 397                                         str = String.Format ("<h1>{0} ({1})</h1>", description, msg);
 398                                 else
 399                                         str = String.Format ("<h1>{0}</h1>", description);
 400
 401                                 byte [] error = context.Response.ContentEncoding.GetBytes (str);
 402                                 response.Close (error, false);
 403                         } catch {
 404                                 // response was already closed
 405                         }
 406                 }
 407
 408                 public void SendError ()
 409                 {
 410                         SendError (context.ErrorMessage, context.ErrorStatus);
 411                 }
 412
 413                 void Unbind ()
 414                 {
 415                         if (context_bound) {
 416                                 epl.UnbindContext (context);
 417                                 context_bound = false;
 418                         }
 419                 }
 420
 421                 public void Close ()
 422                 {
 423                         Close (false);
 424                 }
 425
 426                 void CloseSocket ()
 427                 {
 428                         if (sock == null)
 429                                 return;
 430
 431                         try {
 432                                 sock.Close ();
 433                         } catch {
 434                         } finally {
 435                                 sock = null;
 436                         }
 437                         RemoveConnection ();
 438                 }
 439
 440                 internal void Close (bool force_close)
 441                 {
 442                         if (sock != null) {
 443                                 Stream st = GetResponseStream ();
 444                                 if (st != null)
 445                                         st.Close ();
 446
 447                                 o_stream = null;
 448                         }
 449
 450                         if (sock != null) {
 451                                 force_close |= !context.Request.KeepAlive;
 452                                 if (!force_close)
 453                                         force_close = (context.Response.Headers ["connection"] == "close");
 454                                 /*
 455                                 if (!force_close) {
 456 //                                      bool conn_close = (status_code == 400 || status_code == 408 || status_code == 411 ||
 457 //                                                      status_code == 413 || status_code == 414 || status_code == 500 ||
 458 //                                                      status_code == 503);
 459
 460                                         force_close |= (context.Request.ProtocolVersion <= HttpVersion.Version10);
 461                                 }
 462                                 */
 463
 464                                 if (!force_close && context.Request.FlushInput ()) {
 465                                         if (chunked && context.Response.ForceCloseChunked == false) {
 466                                                 // Don't close. Keep working.
 467                                                 reuses++;
 468                                                 Unbind ();
 469                                                 Init ();
 470                                                 BeginReadRequest ();
 471                                                 return;
 472                                         }
 473
 474                                         reuses++;
 475                                         Unbind ();
 476                                         Init ();
 477                                         BeginReadRequest ();
 478                                         return;
 479                                 }
 480
 481                                 Socket s = sock;
 482                                 sock = null;
 483                                 try {
 484                                         if (s != null)
 485                                                 s.Shutdown (SocketShutdown.Both);
 486                                 } catch {
 487                                 } finally {
 488                                         if (s != null)
 489                                                 s.Close ();
 490                                 }
 491                                 Unbind ();
 492                                 RemoveConnection ();
 493                                 return;
 494                         }
 495                 }
 496         }
 497 }
 498 #endif
 499