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