dlls/winhttp/net.c

   1 /*
   2  * Copyright 2008 Hans Leidekker for CodeWeavers
   3  * Copyright 2013 Jacek Caban for CodeWeavers
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  */
  19
  20 #include <assert.h>
  21 #include <stdarg.h>
  22
  23 #define NONAMELESSUNION
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "ws2tcpip.h"
  27 #include "winhttp.h"
  28 #include "schannel.h"
  29
  30 #include "wine/debug.h"
  31 #include "winhttp_private.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  34
  35 static int sock_send(int fd, const void *msg, size_t len, WSAOVERLAPPED *ovr)
  36 {
  37     WSABUF wsabuf;
  38     DWORD size;
  39     int err;
  40
  41     wsabuf.len = len;
  42     wsabuf.buf = (void *)msg;
  43
  44     if (!WSASend( (SOCKET)fd, &wsabuf, 1, &size, 0, ovr, NULL ))
  45     {
  46         assert( size == len );
  47         return size;
  48     }
  49     err = WSAGetLastError();
  50     if (!(ovr && err == WSA_IO_PENDING)) WARN( "send error %d\n", err );
  51     return -1;
  52 }
  53
  54 BOOL netconn_wait_overlapped_result( struct netconn *conn, WSAOVERLAPPED *ovr, DWORD *len )
  55 {
  56     OVERLAPPED *completion_ovr;
  57     ULONG_PTR key;
  58
  59     if (!GetQueuedCompletionStatus( conn->port, len, &key, &completion_ovr, INFINITE ))
  60     {
  61         WARN( "GetQueuedCompletionStatus failed, err %lu.\n", GetLastError() );
  62         return FALSE;
  63     }
  64     if ((key != conn->socket && conn->socket != -1) || completion_ovr != (OVERLAPPED *)ovr)
  65     {
  66         ERR( "Unexpected completion key %Ix, overlapped %p.\n", key, completion_ovr );
  67         return FALSE;
  68     }
  69     return TRUE;
  70 }
  71
  72 static int sock_recv(int fd, void *msg, size_t len, int flags)
  73 {
  74     int ret;
  75     do
  76     {
  77         if ((ret = recv(fd, msg, len, flags)) == -1) WARN( "recv error %d\n", WSAGetLastError() );
  78     }
  79     while(ret == -1 && WSAGetLastError() == WSAEINTR);
  80     return ret;
  81 }
  82
  83 static DWORD netconn_verify_cert( PCCERT_CONTEXT cert, WCHAR *server, DWORD security_flags, BOOL check_revocation )
  84 {
  85     HCERTSTORE store = cert->hCertStore;
  86     BOOL ret;
  87     CERT_CHAIN_PARA chainPara = { sizeof(chainPara), { 0 } };
  88     PCCERT_CHAIN_CONTEXT chain;
  89     char oid_server_auth[] = szOID_PKIX_KP_SERVER_AUTH;
  90     char *server_auth[] = { oid_server_auth };
  91     DWORD err = ERROR_SUCCESS;
  92
  93     TRACE("verifying %s\n", debugstr_w( server ));
  94     chainPara.RequestedUsage.Usage.cUsageIdentifier = 1;
  95     chainPara.RequestedUsage.Usage.rgpszUsageIdentifier = server_auth;
  96     ret = CertGetCertificateChain( NULL, cert, NULL, store, &chainPara,
  97                                    check_revocation ? CERT_CHAIN_REVOCATION_CHECK_CHAIN_EXCLUDE_ROOT : 0,
  98                                    NULL, &chain );
  99     if (ret)
 100     {
 101         if (chain->TrustStatus.dwErrorStatus)
 102         {
 103             static const DWORD supportedErrors =
 104                 CERT_TRUST_IS_NOT_TIME_VALID |
 105                 CERT_TRUST_IS_UNTRUSTED_ROOT |
 106                 CERT_TRUST_IS_NOT_VALID_FOR_USAGE;
 107
 108             if (chain->TrustStatus.dwErrorStatus & CERT_TRUST_IS_NOT_TIME_VALID)
 109             {
 110                 if (!(security_flags & SECURITY_FLAG_IGNORE_CERT_DATE_INVALID))
 111                     err = ERROR_WINHTTP_SECURE_CERT_DATE_INVALID;
 112             }
 113             else if ((chain->TrustStatus.dwErrorStatus &
 114                       CERT_TRUST_IS_UNTRUSTED_ROOT) ||
 115                      (chain->TrustStatus.dwErrorStatus &
 116                       CERT_TRUST_IS_PARTIAL_CHAIN))
 117             {
 118                 if (!(security_flags & SECURITY_FLAG_IGNORE_UNKNOWN_CA))
 119                     err = ERROR_WINHTTP_SECURE_INVALID_CA;
 120             }
 121             else if ((chain->TrustStatus.dwErrorStatus &
 122                       CERT_TRUST_IS_OFFLINE_REVOCATION) ||
 123                      (chain->TrustStatus.dwErrorStatus &
 124                       CERT_TRUST_REVOCATION_STATUS_UNKNOWN))
 125                 err = ERROR_WINHTTP_SECURE_CERT_REV_FAILED;
 126             else if (chain->TrustStatus.dwErrorStatus & CERT_TRUST_IS_REVOKED)
 127                 err = ERROR_WINHTTP_SECURE_CERT_REVOKED;
 128             else if (chain->TrustStatus.dwErrorStatus &
 129                 CERT_TRUST_IS_NOT_VALID_FOR_USAGE)
 130             {
 131                 if (!(security_flags & SECURITY_FLAG_IGNORE_CERT_WRONG_USAGE))
 132                     err = ERROR_WINHTTP_SECURE_CERT_WRONG_USAGE;
 133             }
 134             else if (chain->TrustStatus.dwErrorStatus & ~supportedErrors)
 135                 err = ERROR_WINHTTP_SECURE_INVALID_CERT;
 136         }
 137         if (!err)
 138         {
 139             CERT_CHAIN_POLICY_PARA policyPara;
 140             SSL_EXTRA_CERT_CHAIN_POLICY_PARA sslExtraPolicyPara;
 141             CERT_CHAIN_POLICY_STATUS policyStatus;
 142             CERT_CHAIN_CONTEXT chainCopy;
 143
 144             /* Clear chain->TrustStatus.dwErrorStatus so
 145              * CertVerifyCertificateChainPolicy will verify additional checks
 146              * rather than stopping with an existing, ignored error.
 147              */
 148             memcpy(&chainCopy, chain, sizeof(chainCopy));
 149             chainCopy.TrustStatus.dwErrorStatus = 0;
 150             sslExtraPolicyPara.u.cbSize = sizeof(sslExtraPolicyPara);
 151             sslExtraPolicyPara.dwAuthType = AUTHTYPE_SERVER;
 152             sslExtraPolicyPara.pwszServerName = server;
 153             sslExtraPolicyPara.fdwChecks = security_flags;
 154             policyPara.cbSize = sizeof(policyPara);
 155             policyPara.dwFlags = 0;
 156             policyPara.pvExtraPolicyPara = &sslExtraPolicyPara;
 157             ret = CertVerifyCertificateChainPolicy( CERT_CHAIN_POLICY_SSL,
 158                                                     &chainCopy, &policyPara,
 159                                                     &policyStatus );
 160             /* Any error in the policy status indicates that the
 161              * policy couldn't be verified.
 162              */
 163             if (ret && policyStatus.dwError)
 164             {
 165                 if (policyStatus.dwError == CERT_E_CN_NO_MATCH)
 166                     err = ERROR_WINHTTP_SECURE_CERT_CN_INVALID;
 167                 else
 168                     err = ERROR_WINHTTP_SECURE_INVALID_CERT;
 169             }
 170         }
 171         CertFreeCertificateChain( chain );
 172     }
 173     else
 174         err = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 175     TRACE( "returning %#lx\n", err );
 176     return err;
 177 }
 178
 179 static BOOL winsock_loaded;
 180
 181 void netconn_unload( void )
 182 {
 183     if (winsock_loaded) WSACleanup();
 184 }
 185
 186 static BOOL WINAPI winsock_startup( INIT_ONCE *once, void *param, void **ctx )
 187 {
 188     int ret;
 189     WSADATA data;
 190     if (!(ret = WSAStartup( MAKEWORD(1,1), &data ))) winsock_loaded = TRUE;
 191     else ERR( "WSAStartup failed: %d\n", ret );
 192     return TRUE;
 193 }
 194
 195 static void winsock_init(void)
 196 {
 197     static INIT_ONCE once = INIT_ONCE_STATIC_INIT;
 198     InitOnceExecuteOnce( &once, winsock_startup, NULL, NULL );
 199 }
 200
 201 static void set_blocking( struct netconn *conn, BOOL blocking )
 202 {
 203     ULONG state = !blocking;
 204     ioctlsocket( conn->socket, FIONBIO, &state );
 205 }
 206
 207 DWORD netconn_create( struct hostdata *host, const struct sockaddr_storage *sockaddr, int timeout,
 208                       struct netconn **ret_conn )
 209 {
 210     struct netconn *conn;
 211     unsigned int addr_len;
 212     DWORD ret;
 213
 214     winsock_init();
 215
 216     if (!(conn = calloc( 1, sizeof(*conn) ))) return ERROR_OUTOFMEMORY;
 217     conn->host = host;
 218     conn->sockaddr = *sockaddr;
 219     if ((conn->socket = WSASocketW( sockaddr->ss_family, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED )) == -1)
 220     {
 221         ret = WSAGetLastError();
 222         WARN( "unable to create socket (%lu)\n", ret );
 223         free( conn );
 224         return ret;
 225     }
 226
 227     switch (conn->sockaddr.ss_family)
 228     {
 229     case AF_INET:
 230         addr_len = sizeof(struct sockaddr_in);
 231         break;
 232     case AF_INET6:
 233         addr_len = sizeof(struct sockaddr_in6);
 234         break;
 235     default:
 236         ERR( "unhandled family %u\n", conn->sockaddr.ss_family );
 237         free( conn );
 238         return ERROR_INVALID_PARAMETER;
 239     }
 240
 241     if (timeout > 0) set_blocking( conn, FALSE );
 242
 243     if (!connect( conn->socket, (const struct sockaddr *)&conn->sockaddr, addr_len )) ret = ERROR_SUCCESS;
 244     else
 245     {
 246         ret = WSAGetLastError();
 247         if (ret == WSAEWOULDBLOCK || ret == WSAEINPROGRESS)
 248         {
 249             TIMEVAL timeval = { timeout / 1000, (timeout % 1000) * 1000 };
 250             FD_SET set_read, set_error;
 251             int res;
 252
 253             FD_ZERO( &set_read );
 254             FD_SET( conn->socket, &set_read );
 255             FD_ZERO( &set_error );
 256             FD_SET( conn->socket, &set_error );
 257             if ((res = select( conn->socket + 1, NULL, &set_read, &set_error, &timeval )) > 0)
 258             {
 259                 if (FD_ISSET(conn->socket, &set_read)) ret = ERROR_SUCCESS;
 260                 else                                   assert( FD_ISSET(conn->socket, &set_error) );
 261             }
 262             else if (!res) ret = ERROR_WINHTTP_TIMEOUT;
 263         }
 264     }
 265
 266     if (timeout > 0) set_blocking( conn, TRUE );
 267
 268     if (ret)
 269     {
 270         WARN( "unable to connect to host (%lu)\n", ret );
 271         closesocket( conn->socket );
 272         free( conn );
 273         return ret == ERROR_WINHTTP_TIMEOUT ? ERROR_WINHTTP_TIMEOUT : ERROR_WINHTTP_CANNOT_CONNECT;
 274     }
 275
 276     *ret_conn = conn;
 277     return ERROR_SUCCESS;
 278 }
 279
 280 void netconn_close( struct netconn *conn )
 281 {
 282     if (conn->secure)
 283     {
 284         free( conn->peek_msg_mem );
 285         free(conn->ssl_read_buf);
 286         free(conn->ssl_write_buf);
 287         free(conn->extra_buf);
 288         DeleteSecurityContext(&conn->ssl_ctx);
 289     }
 290     if (conn->socket != -1)
 291         closesocket( conn->socket );
 292     release_host( conn->host );
 293     if (conn->port)
 294         CloseHandle( conn->port );
 295     free(conn);
 296 }
 297
 298 DWORD netconn_secure_connect( struct netconn *conn, WCHAR *hostname, DWORD security_flags, CredHandle *cred_handle,
 299                               BOOL check_revocation )
 300 {
 301     SecBuffer out_buf = {0, SECBUFFER_TOKEN, NULL}, in_bufs[2] = {{0, SECBUFFER_TOKEN}, {0, SECBUFFER_EMPTY}};
 302     SecBufferDesc out_desc = {SECBUFFER_VERSION, 1, &out_buf}, in_desc = {SECBUFFER_VERSION, 2, in_bufs};
 303     BYTE *read_buf;
 304     SIZE_T read_buf_size = 2048;
 305     ULONG attrs = 0;
 306     CtxtHandle ctx;
 307     SSIZE_T size;
 308     const CERT_CONTEXT *cert;
 309     SECURITY_STATUS status;
 310     DWORD res = ERROR_SUCCESS;
 311
 312     const DWORD isc_req_flags = ISC_REQ_ALLOCATE_MEMORY|ISC_REQ_USE_SESSION_KEY|ISC_REQ_CONFIDENTIALITY
 313         |ISC_REQ_SEQUENCE_DETECT|ISC_REQ_REPLAY_DETECT|ISC_REQ_MANUAL_CRED_VALIDATION;
 314
 315     if (!(read_buf = malloc( read_buf_size ))) return ERROR_OUTOFMEMORY;
 316
 317     memset( &ctx, 0, sizeof(ctx) );
 318     status = InitializeSecurityContextW(cred_handle, NULL, hostname, isc_req_flags, 0, 0, NULL, 0,
 319             &ctx, &out_desc, &attrs, NULL);
 320
 321     assert(status != SEC_E_OK);
 322
 323     while(status == SEC_I_CONTINUE_NEEDED || status == SEC_E_INCOMPLETE_MESSAGE) {
 324         if(out_buf.cbBuffer) {
 325             assert(status == SEC_I_CONTINUE_NEEDED);
 326
 327             TRACE( "sending %lu bytes\n", out_buf.cbBuffer );
 328
 329             size = sock_send(conn->socket, out_buf.pvBuffer, out_buf.cbBuffer, NULL);
 330             if(size != out_buf.cbBuffer) {
 331                 ERR("send failed\n");
 332                 res = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 333                 break;
 334             }
 335
 336             FreeContextBuffer(out_buf.pvBuffer);
 337             out_buf.pvBuffer = NULL;
 338             out_buf.cbBuffer = 0;
 339         }
 340
 341         if(status == SEC_I_CONTINUE_NEEDED) {
 342             assert(in_bufs[1].cbBuffer < read_buf_size);
 343
 344             memmove(read_buf, (BYTE*)in_bufs[0].pvBuffer+in_bufs[0].cbBuffer-in_bufs[1].cbBuffer, in_bufs[1].cbBuffer);
 345             in_bufs[0].cbBuffer = in_bufs[1].cbBuffer;
 346
 347             in_bufs[1].BufferType = SECBUFFER_EMPTY;
 348             in_bufs[1].cbBuffer = 0;
 349             in_bufs[1].pvBuffer = NULL;
 350         }
 351
 352         assert(in_bufs[0].BufferType == SECBUFFER_TOKEN);
 353         in_bufs[1].BufferType = SECBUFFER_EMPTY;
 354
 355         if(in_bufs[0].cbBuffer + 1024 > read_buf_size) {
 356             BYTE *new_read_buf;
 357
 358             new_read_buf = realloc(read_buf, read_buf_size + 1024);
 359             if(!new_read_buf) {
 360                 status = E_OUTOFMEMORY;
 361                 break;
 362             }
 363
 364             in_bufs[0].pvBuffer = read_buf = new_read_buf;
 365             read_buf_size += 1024;
 366         }
 367
 368         size = sock_recv(conn->socket, read_buf+in_bufs[0].cbBuffer, read_buf_size-in_bufs[0].cbBuffer, 0);
 369         if(size < 1) {
 370             status = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 371             break;
 372         }
 373
 374         TRACE( "recv %Iu bytes\n", size );
 375
 376         in_bufs[0].cbBuffer += size;
 377         in_bufs[0].pvBuffer = read_buf;
 378         status = InitializeSecurityContextW(cred_handle, &ctx, hostname,  isc_req_flags, 0, 0, &in_desc,
 379                 0, NULL, &out_desc, &attrs, NULL);
 380         TRACE( "InitializeSecurityContext ret %#lx\n", status );
 381
 382         if(status == SEC_E_OK) {
 383             if(in_bufs[1].BufferType == SECBUFFER_EXTRA)
 384                 FIXME("SECBUFFER_EXTRA not supported\n");
 385
 386             status = QueryContextAttributesW(&ctx, SECPKG_ATTR_STREAM_SIZES, &conn->ssl_sizes);
 387             if(status != SEC_E_OK) {
 388                 WARN("Could not get sizes\n");
 389                 break;
 390             }
 391
 392             status = QueryContextAttributesW(&ctx, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (void*)&cert);
 393             if(status == SEC_E_OK) {
 394                 res = netconn_verify_cert(cert, hostname, security_flags, check_revocation);
 395                 CertFreeCertificateContext(cert);
 396                 if(res != ERROR_SUCCESS) {
 397                     WARN( "cert verify failed: %lu\n", res );
 398                     break;
 399                 }
 400             }else {
 401                 WARN("Could not get cert\n");
 402                 break;
 403             }
 404
 405             conn->ssl_read_buf = malloc(conn->ssl_sizes.cbHeader + conn->ssl_sizes.cbMaximumMessage + conn->ssl_sizes.cbTrailer);
 406             if(!conn->ssl_read_buf) {
 407                 res = ERROR_OUTOFMEMORY;
 408                 break;
 409             }
 410             conn->ssl_write_buf = malloc(conn->ssl_sizes.cbHeader + conn->ssl_sizes.cbMaximumMessage + conn->ssl_sizes.cbTrailer);
 411             if(!conn->ssl_write_buf) {
 412                 res = ERROR_OUTOFMEMORY;
 413                 break;
 414             }
 415         }
 416     }
 417
 418     free(read_buf);
 419
 420     if(status != SEC_E_OK || res != ERROR_SUCCESS) {
 421         WARN( "Failed to initialize security context: %#lx\n", status );
 422         free(conn->ssl_read_buf);
 423         conn->ssl_read_buf = NULL;
 424         free(conn->ssl_write_buf);
 425         conn->ssl_write_buf = NULL;
 426         DeleteSecurityContext(&ctx);
 427         return ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 428     }
 429
 430
 431     TRACE("established SSL connection\n");
 432     conn->secure = TRUE;
 433     conn->ssl_ctx = ctx;
 434     return ERROR_SUCCESS;
 435 }
 436
 437 static DWORD send_ssl_chunk( struct netconn *conn, const void *msg, size_t size, WSAOVERLAPPED *ovr )
 438 {
 439     SecBuffer bufs[4] = {
 440         {conn->ssl_sizes.cbHeader, SECBUFFER_STREAM_HEADER, conn->ssl_write_buf},
 441         {size,  SECBUFFER_DATA, conn->ssl_write_buf+conn->ssl_sizes.cbHeader},
 442         {conn->ssl_sizes.cbTrailer, SECBUFFER_STREAM_TRAILER, conn->ssl_write_buf+conn->ssl_sizes.cbHeader+size},
 443         {0, SECBUFFER_EMPTY, NULL}
 444     };
 445     SecBufferDesc buf_desc = {SECBUFFER_VERSION, ARRAY_SIZE(bufs), bufs};
 446     SECURITY_STATUS res;
 447
 448     memcpy( bufs[1].pvBuffer, msg, size );
 449     if ((res = EncryptMessage(&conn->ssl_ctx, 0, &buf_desc, 0)) != SEC_E_OK)
 450     {
 451         WARN( "EncryptMessage failed: %#lx\n", res );
 452         return res;
 453     }
 454
 455     if (sock_send( conn->socket, conn->ssl_write_buf, bufs[0].cbBuffer + bufs[1].cbBuffer + bufs[2].cbBuffer, ovr ) < 1)
 456     {
 457         WARN("send failed\n");
 458         return WSAGetLastError();
 459     }
 460
 461     return ERROR_SUCCESS;
 462 }
 463
 464 DWORD netconn_send( struct netconn *conn, const void *msg, size_t len, int *sent, WSAOVERLAPPED *ovr )
 465 {
 466     DWORD err;
 467
 468     if (ovr && !conn->port)
 469     {
 470         if (!(conn->port = CreateIoCompletionPort( (HANDLE)(SOCKET)conn->socket, NULL, (ULONG_PTR)conn->socket, 0 )))
 471             ERR( "Failed to create port.\n" );
 472     }
 473
 474     if (conn->secure)
 475     {
 476         const BYTE *ptr = msg;
 477         size_t chunk_size;
 478         DWORD res;
 479
 480         *sent = 0;
 481         while (len)
 482         {
 483             chunk_size = min( len, conn->ssl_sizes.cbMaximumMessage );
 484             if ((res = send_ssl_chunk( conn, ptr, chunk_size, ovr )))
 485             {
 486                 if (res == WSA_IO_PENDING) *sent += chunk_size;
 487                 return res;
 488             }
 489             *sent += chunk_size;
 490             ptr += chunk_size;
 491             len -= chunk_size;
 492         }
 493
 494         return ERROR_SUCCESS;
 495     }
 496
 497     if ((*sent = sock_send( conn->socket, msg, len, ovr )) < 0)
 498     {
 499         err = WSAGetLastError();
 500         *sent = (err == WSA_IO_PENDING) ? len : 0;
 501         return err;
 502     }
 503     return ERROR_SUCCESS;
 504 }
 505
 506 static DWORD read_ssl_chunk( struct netconn *conn, void *buf, SIZE_T buf_size, SIZE_T *ret_size, BOOL *eof )
 507 {
 508     const SIZE_T ssl_buf_size = conn->ssl_sizes.cbHeader+conn->ssl_sizes.cbMaximumMessage+conn->ssl_sizes.cbTrailer;
 509     SecBuffer bufs[4];
 510     SecBufferDesc buf_desc = {SECBUFFER_VERSION, ARRAY_SIZE(bufs), bufs};
 511     SSIZE_T size, buf_len;
 512     unsigned int i;
 513     SECURITY_STATUS res;
 514
 515     assert(conn->extra_len < ssl_buf_size);
 516
 517     if(conn->extra_len) {
 518         memcpy(conn->ssl_read_buf, conn->extra_buf, conn->extra_len);
 519         buf_len = conn->extra_len;
 520         conn->extra_len = 0;
 521         free(conn->extra_buf);
 522         conn->extra_buf = NULL;
 523     }else {
 524         if ((buf_len = sock_recv( conn->socket, conn->ssl_read_buf + conn->extra_len, ssl_buf_size - conn->extra_len, 0)) < 0)
 525             return WSAGetLastError();
 526
 527         if (!buf_len)
 528         {
 529             *eof = TRUE;
 530             return ERROR_SUCCESS;
 531         }
 532     }
 533
 534     *ret_size = 0;
 535     *eof = FALSE;
 536
 537     do {
 538         memset(bufs, 0, sizeof(bufs));
 539         bufs[0].BufferType = SECBUFFER_DATA;
 540         bufs[0].cbBuffer = buf_len;
 541         bufs[0].pvBuffer = conn->ssl_read_buf;
 542
 543         switch ((res = DecryptMessage( &conn->ssl_ctx, &buf_desc, 0, NULL )))
 544         {
 545         case SEC_E_OK:
 546             break;
 547
 548         case SEC_I_RENEGOTIATE:
 549             TRACE("renegotiate\n");
 550             return ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED;
 551
 552         case SEC_I_CONTEXT_EXPIRED:
 553             TRACE("context expired\n");
 554             *eof = TRUE;
 555             return ERROR_SUCCESS;
 556
 557         case SEC_E_INCOMPLETE_MESSAGE:
 558             assert(buf_len < ssl_buf_size);
 559
 560             if ((size = sock_recv( conn->socket, conn->ssl_read_buf + buf_len, ssl_buf_size - buf_len, 0 )) < 1)
 561                 return SEC_E_INCOMPLETE_MESSAGE;
 562
 563             buf_len += size;
 564             continue;
 565
 566         default:
 567             WARN( "failed: %#lx\n", res );
 568             return res;
 569         }
 570     } while (res != SEC_E_OK);
 571
 572     for(i = 0; i < ARRAY_SIZE(bufs); i++) {
 573         if(bufs[i].BufferType == SECBUFFER_DATA) {
 574             size = min(buf_size, bufs[i].cbBuffer);
 575             memcpy(buf, bufs[i].pvBuffer, size);
 576             if(size < bufs[i].cbBuffer) {
 577                 assert(!conn->peek_len);
 578                 conn->peek_msg_mem = conn->peek_msg = malloc(bufs[i].cbBuffer - size);
 579                 if(!conn->peek_msg)
 580                     return ERROR_OUTOFMEMORY;
 581                 conn->peek_len = bufs[i].cbBuffer-size;
 582                 memcpy(conn->peek_msg, (char*)bufs[i].pvBuffer+size, conn->peek_len);
 583             }
 584
 585             *ret_size = size;
 586         }
 587     }
 588
 589     for(i = 0; i < ARRAY_SIZE(bufs); i++) {
 590         if(bufs[i].BufferType == SECBUFFER_EXTRA) {
 591             conn->extra_buf = malloc(bufs[i].cbBuffer);
 592             if(!conn->extra_buf)
 593                 return ERROR_OUTOFMEMORY;
 594
 595             conn->extra_len = bufs[i].cbBuffer;
 596             memcpy(conn->extra_buf, bufs[i].pvBuffer, conn->extra_len);
 597         }
 598     }
 599
 600     return ERROR_SUCCESS;
 601 }
 602
 603 DWORD netconn_recv( struct netconn *conn, void *buf, size_t len, int flags, int *recvd )
 604 {
 605     *recvd = 0;
 606     if (!len) return ERROR_SUCCESS;
 607
 608     if (conn->secure)
 609     {
 610         SIZE_T size;
 611         DWORD res;
 612         BOOL eof;
 613
 614         if (conn->peek_msg)
 615         {
 616             *recvd = min( len, conn->peek_len );
 617             memcpy( buf, conn->peek_msg, *recvd );
 618             conn->peek_len -= *recvd;
 619             conn->peek_msg += *recvd;
 620
 621             if (conn->peek_len == 0)
 622             {
 623                 free( conn->peek_msg_mem );
 624                 conn->peek_msg_mem = NULL;
 625                 conn->peek_msg = NULL;
 626             }
 627             /* check if we have enough data from the peek buffer */
 628             if (!(flags & MSG_WAITALL) || *recvd == len) return ERROR_SUCCESS;
 629         }
 630         size = *recvd;
 631
 632         do
 633         {
 634             SIZE_T cread = 0;
 635             if ((res = read_ssl_chunk( conn, (BYTE *)buf + size, len - size, &cread, &eof )))
 636             {
 637                 WARN( "read_ssl_chunk failed: %lu\n", res );
 638                 if (!size) return res;
 639                 break;
 640             }
 641             if (eof)
 642             {
 643                 TRACE("EOF\n");
 644                 break;
 645             }
 646             size += cread;
 647
 648         } while (!size || ((flags & MSG_WAITALL) && size < len));
 649
 650         TRACE( "received %Iu bytes\n", size );
 651         *recvd = size;
 652         return ERROR_SUCCESS;
 653     }
 654
 655     if ((*recvd = sock_recv( conn->socket, buf, len, flags )) < 0) return WSAGetLastError();
 656     return ERROR_SUCCESS;
 657 }
 658
 659 void netconn_cancel_io( struct netconn *conn )
 660 {
 661     SOCKET socket = InterlockedExchange( (LONG *)&conn->socket, -1 );
 662
 663     closesocket( socket );
 664 }
 665
 666 ULONG netconn_query_data_available( struct netconn *conn )
 667 {
 668     return conn->secure ? conn->peek_len : 0;
 669 }
 670
 671 DWORD netconn_set_timeout( struct netconn *netconn, BOOL send, int value )
 672 {
 673     int opt = send ? SO_SNDTIMEO : SO_RCVTIMEO;
 674     if (setsockopt( netconn->socket, SOL_SOCKET, opt, (void *)&value, sizeof(value) ) == -1)
 675     {
 676         DWORD err = WSAGetLastError();
 677         WARN( "setsockopt failed (%lu)\n", err );
 678         return err;
 679     }
 680     return ERROR_SUCCESS;
 681 }
 682
 683 BOOL netconn_is_alive( struct netconn *netconn )
 684 {
 685     SIZE_T size;
 686     int len;
 687     char b;
 688     DWORD err;
 689     BOOL eof;
 690
 691     set_blocking( netconn, FALSE );
 692     if (netconn->secure)
 693     {
 694         while (!netconn->peek_msg && !(err = read_ssl_chunk( netconn, NULL, 0, &size, &eof )) && !eof)
 695             ;
 696
 697         TRACE( "checking secure connection, err %lu\n", err );
 698
 699         if (netconn->peek_msg || err == WSAEWOULDBLOCK)
 700         {
 701             set_blocking( netconn, TRUE );
 702             return TRUE;
 703         }
 704         if (err != SEC_E_OK && err != SEC_E_INCOMPLETE_MESSAGE)
 705         {
 706             set_blocking( netconn, TRUE );
 707             return FALSE;
 708         }
 709     }
 710     len = sock_recv( netconn->socket, &b, 1, MSG_PEEK );
 711     err = WSAGetLastError();
 712     set_blocking( netconn, TRUE );
 713
 714     return len == 1 || (len == -1 && err == WSAEWOULDBLOCK);
 715 }
 716
 717 static DWORD resolve_hostname( const WCHAR *name, INTERNET_PORT port, struct sockaddr_storage *sa )
 718 {
 719     ADDRINFOW *res, hints;
 720     int ret;
 721
 722     memset( &hints, 0, sizeof(hints) );
 723     /* Prefer IPv4 to IPv6 addresses, since some web servers do not listen on
 724      * their IPv6 addresses even though they have IPv6 addresses in the DNS.
 725      */
 726     hints.ai_family = AF_INET;
 727
 728     ret = GetAddrInfoW( name, NULL, &hints, &res );
 729     if (ret != 0)
 730     {
 731         TRACE("failed to get IPv4 address of %s, retrying with IPv6\n", debugstr_w(name));
 732         hints.ai_family = AF_INET6;
 733         ret = GetAddrInfoW( name, NULL, &hints, &res );
 734         if (ret != 0)
 735         {
 736             TRACE("failed to get address of %s\n", debugstr_w(name));
 737             return ERROR_WINHTTP_NAME_NOT_RESOLVED;
 738         }
 739     }
 740     memcpy( sa, res->ai_addr, res->ai_addrlen );
 741     switch (res->ai_family)
 742     {
 743     case AF_INET:
 744         ((struct sockaddr_in *)sa)->sin_port = htons( port );
 745         break;
 746     case AF_INET6:
 747         ((struct sockaddr_in6 *)sa)->sin6_port = htons( port );
 748         break;
 749     }
 750
 751     FreeAddrInfoW( res );
 752     return ERROR_SUCCESS;
 753 }
 754
 755 struct async_resolve
 756 {
 757     const WCHAR             *hostname;
 758     INTERNET_PORT            port;
 759     struct sockaddr_storage *addr;
 760     DWORD                    result;
 761     HANDLE                   done;
 762 };
 763
 764 static void CALLBACK resolve_proc( TP_CALLBACK_INSTANCE *instance, void *ctx )
 765 {
 766     struct async_resolve *async = ctx;
 767     async->result = resolve_hostname( async->hostname, async->port, async->addr );
 768     SetEvent( async->done );
 769 }
 770
 771 DWORD netconn_resolve( WCHAR *hostname, INTERNET_PORT port, struct sockaddr_storage *addr, int timeout )
 772 {
 773     DWORD ret;
 774
 775     if (!timeout) ret = resolve_hostname( hostname, port, addr );
 776     else
 777     {
 778         struct async_resolve async;
 779
 780         async.hostname = hostname;
 781         async.port     = port;
 782         async.addr     = addr;
 783         if (!(async.done = CreateEventW( NULL, FALSE, FALSE, NULL ))) return GetLastError();
 784         if (!TrySubmitThreadpoolCallback( resolve_proc, &async, NULL ))
 785         {
 786             CloseHandle( async.done );
 787             return GetLastError();
 788         }
 789         if (WaitForSingleObject( async.done, timeout ) != WAIT_OBJECT_0) ret = ERROR_WINHTTP_TIMEOUT;
 790         else ret = async.result;
 791         CloseHandle( async.done );
 792     }
 793
 794     return ret;
 795 }
 796
 797 const void *netconn_get_certificate( struct netconn *conn )
 798 {
 799     const CERT_CONTEXT *ret;
 800     SECURITY_STATUS res;
 801
 802     if (!conn->secure) return NULL;
 803     res = QueryContextAttributesW(&conn->ssl_ctx, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (void*)&ret);
 804     return res == SEC_E_OK ? ret : NULL;
 805 }
 806
 807 int netconn_get_cipher_strength( struct netconn *conn )
 808 {
 809     SecPkgContext_ConnectionInfo conn_info;
 810     SECURITY_STATUS res;
 811
 812     if (!conn->secure) return 0;
 813     res = QueryContextAttributesW(&conn->ssl_ctx, SECPKG_ATTR_CONNECTION_INFO, (void*)&conn_info);
 814     if(res != SEC_E_OK)
 815         WARN( "QueryContextAttributesW failed: %#lx\n", res );
 816     return res == SEC_E_OK ? conn_info.dwCipherStrength : 0;
 817 }