897 lines
19 KiB
C
897 lines
19 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Network Transport Layer
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*
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* Copyright 2011 Vic Lee
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <winpr/crt.h>
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#include <winpr/synch.h>
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#include <winpr/print.h>
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#include <freerdp/error.h>
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#include <freerdp/utils/tcp.h>
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#include <winpr/stream.h>
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#include <time.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifndef _WIN32
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#include <netdb.h>
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#include <sys/socket.h>
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#endif
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#include "tpkt.h"
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#include "fastpath.h"
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#include "transport.h"
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#define BUFFER_SIZE 16384
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static void* transport_client_thread(void* arg);
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wStream* transport_send_stream_init(rdpTransport* transport, int size)
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{
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wStream* s;
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s = StreamPool_Take(transport->ReceivePool, size);
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Stream_EnsureCapacity(s, size);
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Stream_SetPosition(s, 0);
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return s;
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}
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void transport_attach(rdpTransport* transport, int sockfd)
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{
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tcp_attach(transport->TcpIn, sockfd);
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transport->SplitInputOutput = FALSE;
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transport->TcpOut = transport->TcpIn;
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}
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BOOL transport_disconnect(rdpTransport* transport)
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{
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BOOL status = TRUE;
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if (transport->layer == TRANSPORT_LAYER_TLS)
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status &= tls_disconnect(transport->TlsIn);
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if (transport->layer == TRANSPORT_LAYER_TSG)
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{
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tsg_disconnect(transport->tsg);
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}
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else
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{
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status &= tcp_disconnect(transport->TcpIn);
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}
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return status;
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}
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BOOL transport_connect_rdp(rdpTransport* transport)
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{
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/* RDP encryption */
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return TRUE;
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}
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BOOL transport_connect_tls(rdpTransport* transport)
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{
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if (transport->layer == TRANSPORT_LAYER_TSG)
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return TRUE;
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if (transport->TlsIn == NULL)
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transport->TlsIn = tls_new(transport->settings);
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if (transport->TlsOut == NULL)
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transport->TlsOut = transport->TlsIn;
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transport->layer = TRANSPORT_LAYER_TLS;
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transport->TlsIn->sockfd = transport->TcpIn->sockfd;
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if (tls_connect(transport->TlsIn) != TRUE)
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{
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if (!connectErrorCode)
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connectErrorCode = TLSCONNECTERROR;
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tls_free(transport->TlsIn);
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if (transport->TlsIn == transport->TlsOut)
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transport->TlsIn = transport->TlsOut = NULL;
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else
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transport->TlsIn = NULL;
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return FALSE;
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}
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return TRUE;
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}
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BOOL transport_connect_nla(rdpTransport* transport)
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{
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freerdp* instance;
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rdpSettings* settings;
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if (transport->layer == TRANSPORT_LAYER_TSG)
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return TRUE;
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if (!transport_connect_tls(transport))
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return FALSE;
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/* Network Level Authentication */
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if (transport->settings->Authentication != TRUE)
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return TRUE;
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settings = transport->settings;
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instance = (freerdp*) settings->instance;
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if (transport->credssp == NULL)
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transport->credssp = credssp_new(instance, transport, settings);
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if (credssp_authenticate(transport->credssp) < 0)
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{
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if (!connectErrorCode)
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connectErrorCode = AUTHENTICATIONERROR;
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fprintf(stderr, "Authentication failure, check credentials.\n"
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"If credentials are valid, the NTLMSSP implementation may be to blame.\n");
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credssp_free(transport->credssp);
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transport->credssp = NULL;
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return FALSE;
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}
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credssp_free(transport->credssp);
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return TRUE;
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}
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BOOL transport_tsg_connect(rdpTransport* transport, const char* hostname, UINT16 port)
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{
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rdpTsg* tsg = tsg_new(transport);
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tsg->transport = transport;
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transport->tsg = tsg;
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transport->SplitInputOutput = TRUE;
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if (transport->TlsIn == NULL)
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transport->TlsIn = tls_new(transport->settings);
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transport->TlsIn->sockfd = transport->TcpIn->sockfd;
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if (transport->TlsOut == NULL)
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transport->TlsOut = tls_new(transport->settings);
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transport->TlsOut->sockfd = transport->TcpOut->sockfd;
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if (tls_connect(transport->TlsIn) != TRUE)
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return FALSE;
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if (tls_connect(transport->TlsOut) != TRUE)
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return FALSE;
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if (!tsg_connect(tsg, hostname, port))
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return FALSE;
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return TRUE;
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}
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BOOL transport_connect(rdpTransport* transport, const char* hostname, UINT16 port)
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{
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BOOL status = FALSE;
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rdpSettings* settings = transport->settings;
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transport->async = transport->settings->AsyncTransport;
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if (transport->async)
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{
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transport->stopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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transport->thread = CreateThread(NULL, 0,
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(LPTHREAD_START_ROUTINE) transport_client_thread, transport, 0, NULL);
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}
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if (transport->settings->GatewayEnabled)
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{
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transport->layer = TRANSPORT_LAYER_TSG;
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transport->TcpOut = tcp_new(settings);
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status = tcp_connect(transport->TcpIn, settings->GatewayHostname, 443);
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if (status)
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status = tcp_connect(transport->TcpOut, settings->GatewayHostname, 443);
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if (status)
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status = transport_tsg_connect(transport, hostname, port);
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}
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else
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{
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status = tcp_connect(transport->TcpIn, hostname, port);
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transport->SplitInputOutput = FALSE;
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transport->TcpOut = transport->TcpIn;
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}
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return status;
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}
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BOOL transport_accept_rdp(rdpTransport* transport)
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{
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/* RDP encryption */
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return TRUE;
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}
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BOOL transport_accept_tls(rdpTransport* transport)
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{
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if (transport->TlsIn == NULL)
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transport->TlsIn = tls_new(transport->settings);
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if (transport->TlsOut == NULL)
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transport->TlsOut = transport->TlsIn;
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transport->layer = TRANSPORT_LAYER_TLS;
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transport->TlsIn->sockfd = transport->TcpIn->sockfd;
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if (tls_accept(transport->TlsIn, transport->settings->CertificateFile, transport->settings->PrivateKeyFile) != TRUE)
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return FALSE;
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return TRUE;
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}
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BOOL transport_accept_nla(rdpTransport* transport)
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{
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freerdp* instance;
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rdpSettings* settings;
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if (transport->TlsIn == NULL)
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transport->TlsIn = tls_new(transport->settings);
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if (transport->TlsOut == NULL)
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transport->TlsOut = transport->TlsIn;
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transport->layer = TRANSPORT_LAYER_TLS;
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transport->TlsIn->sockfd = transport->TcpIn->sockfd;
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if (tls_accept(transport->TlsIn, transport->settings->CertificateFile, transport->settings->PrivateKeyFile) != TRUE)
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return FALSE;
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/* Network Level Authentication */
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if (transport->settings->Authentication != TRUE)
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return TRUE;
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settings = transport->settings;
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instance = (freerdp*) settings->instance;
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if (transport->credssp == NULL)
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transport->credssp = credssp_new(instance, transport, settings);
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if (credssp_authenticate(transport->credssp) < 0)
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{
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fprintf(stderr, "client authentication failure\n");
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credssp_free(transport->credssp);
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transport->credssp = NULL;
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return FALSE;
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}
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/* don't free credssp module yet, we need to copy the credentials from it first */
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return TRUE;
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}
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BOOL nla_verify_header(wStream* s)
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{
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if ((s->pointer[0] == 0x30) && (s->pointer[1] & 0x80))
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return TRUE;
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return FALSE;
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}
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UINT32 nla_read_header(wStream* s)
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{
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UINT32 length = 0;
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if (s->pointer[1] & 0x80)
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{
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if ((s->pointer[1] & ~(0x80)) == 1)
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{
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length = s->pointer[2];
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length += 3;
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Stream_Seek(s, 3);
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}
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else if ((s->pointer[1] & ~(0x80)) == 2)
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{
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length = (s->pointer[2] << 8) | s->pointer[3];
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length += 4;
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Stream_Seek(s, 4);
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}
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else
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{
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fprintf(stderr, "Error reading TSRequest!\n");
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}
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}
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else
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{
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length = s->pointer[1];
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length += 2;
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Stream_Seek(s, 2);
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}
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return length;
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}
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UINT32 nla_header_length(wStream* s)
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{
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UINT32 length = 0;
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if (s->pointer[1] & 0x80)
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{
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if ((s->pointer[1] & ~(0x80)) == 1)
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length = 3;
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else if ((s->pointer[1] & ~(0x80)) == 2)
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length = 4;
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else
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fprintf(stderr, "Error reading TSRequest!\n");
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}
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else
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{
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length = 2;
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}
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return length;
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}
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int transport_read_layer(rdpTransport* transport, UINT8* data, int bytes)
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{
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int read = 0;
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int status = -1;
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while (read < bytes)
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{
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if (transport->layer == TRANSPORT_LAYER_TLS)
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status = tls_read(transport->TlsIn, data + read, bytes - read);
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else if (transport->layer == TRANSPORT_LAYER_TCP)
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status = tcp_read(transport->TcpIn, data + read, bytes - read);
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else if (transport->layer == TRANSPORT_LAYER_TSG)
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status = tsg_read(transport->tsg, data + read, bytes - read);
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/* blocking means that we can't continue until this is read */
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if (!transport->blocking)
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return status;
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if (status < 0)
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return status;
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read += status;
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if (status == 0)
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{
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/*
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* instead of sleeping, we should wait timeout on the
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* socket but this only happens on initial connection
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*/
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USleep(transport->SleepInterval);
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}
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}
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return read;
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}
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int transport_read(rdpTransport* transport, wStream* s)
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{
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int status;
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int pduLength;
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int streamPosition;
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int transport_status;
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pduLength = 0;
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transport_status = 0;
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/* first check if we have header */
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streamPosition = Stream_GetPosition(s);
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if (streamPosition < 4)
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{
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status = transport_read_layer(transport, Stream_Buffer(s) + streamPosition, 4 - streamPosition);
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if (status < 0)
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return status;
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transport_status += status;
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if ((status + streamPosition) < 4)
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return transport_status;
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streamPosition += status;
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}
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/* if header is present, read in exactly one PDU */
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if (s->buffer[0] == 0x03)
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{
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/* TPKT header */
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pduLength = (s->buffer[2] << 8) | s->buffer[3];
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}
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else if (s->buffer[0] == 0x30)
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{
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/* TSRequest (NLA) */
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if (s->buffer[1] & 0x80)
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{
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if ((s->buffer[1] & ~(0x80)) == 1)
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{
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pduLength = s->buffer[2];
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pduLength += 3;
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}
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else if ((s->buffer[1] & ~(0x80)) == 2)
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{
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pduLength = (s->buffer[2] << 8) | s->buffer[3];
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pduLength += 4;
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}
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else
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{
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fprintf(stderr, "Error reading TSRequest!\n");
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}
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}
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else
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{
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pduLength = s->buffer[1];
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pduLength += 2;
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}
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}
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else
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{
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/* Fast-Path Header */
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if (s->buffer[1] & 0x80)
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pduLength = ((s->buffer[1] & 0x7F) << 8) | s->buffer[2];
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else
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pduLength = s->buffer[1];
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}
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status = transport_read_layer(transport, Stream_Buffer(s) + streamPosition, pduLength - streamPosition);
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if (status < 0)
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return status;
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transport_status += status;
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#ifdef WITH_DEBUG_TRANSPORT
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/* dump when whole PDU is read */
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if (streamPosition + status >= pduLength)
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{
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fprintf(stderr, "Local < Remote\n");
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winpr_HexDump(Stream_Buffer(s), pduLength);
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}
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#endif
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return transport_status;
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}
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static int transport_read_nonblocking(rdpTransport* transport)
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{
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int status;
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status = transport_read(transport, transport->ReceiveBuffer);
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if (status <= 0)
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return status;
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Stream_Seek(transport->ReceiveBuffer, status);
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return status;
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}
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int transport_write(rdpTransport* transport, wStream* s)
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{
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int length;
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int status = -1;
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WaitForSingleObject(transport->WriteMutex, INFINITE);
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length = Stream_GetPosition(s);
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Stream_SetPosition(s, 0);
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#ifdef WITH_DEBUG_TRANSPORT
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if (length > 0)
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{
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fprintf(stderr, "Local > Remote\n");
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winpr_HexDump(Stream_Buffer(s), length);
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}
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#endif
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while (length > 0)
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{
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if (transport->layer == TRANSPORT_LAYER_TLS)
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status = tls_write(transport->TlsOut, Stream_Pointer(s), length);
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else if (transport->layer == TRANSPORT_LAYER_TCP)
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status = tcp_write(transport->TcpOut, Stream_Pointer(s), length);
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else if (transport->layer == TRANSPORT_LAYER_TSG)
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status = tsg_write(transport->tsg, Stream_Pointer(s), length);
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if (status < 0)
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break; /* error occurred */
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if (status == 0)
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{
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/* when sending is blocked in nonblocking mode, the receiving buffer should be checked */
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if (!transport->blocking)
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{
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/* and in case we do have buffered some data, we set the event so next loop will get it */
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if (transport_read_nonblocking(transport) > 0)
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SetEvent(transport->ReceiveEvent);
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}
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if (transport->layer == TRANSPORT_LAYER_TLS)
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tls_wait_write(transport->TlsOut);
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else if (transport->layer == TRANSPORT_LAYER_TCP)
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tcp_wait_write(transport->TcpOut);
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else
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USleep(transport->SleepInterval);
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}
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length -= status;
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Stream_Seek(s, status);
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}
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if (status < 0)
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{
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/* A write error indicates that the peer has dropped the connection */
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transport->layer = TRANSPORT_LAYER_CLOSED;
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}
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if (s->pool)
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Stream_Release(s);
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ReleaseMutex(transport->WriteMutex);
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return status;
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}
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void transport_get_fds(rdpTransport* transport, void** rfds, int* rcount)
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{
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void* pfd;
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#ifdef _WIN32
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rfds[*rcount] = transport->TcpIn->wsa_event;
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(*rcount)++;
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if (transport->SplitInputOutput)
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{
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rfds[*rcount] = transport->TcpOut->wsa_event;
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(*rcount)++;
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}
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#else
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rfds[*rcount] = (void*)(long)(transport->TcpIn->sockfd);
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(*rcount)++;
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if (transport->SplitInputOutput)
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{
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rfds[*rcount] = (void*)(long)(transport->TcpOut->sockfd);
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(*rcount)++;
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}
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#endif
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pfd = GetEventWaitObject(transport->ReceiveEvent);
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if (pfd)
|
|
{
|
|
rfds[*rcount] = pfd;
|
|
(*rcount)++;
|
|
}
|
|
|
|
if (transport->GatewayEvent)
|
|
{
|
|
pfd = GetEventWaitObject(transport->GatewayEvent);
|
|
|
|
if (pfd)
|
|
{
|
|
rfds[*rcount] = pfd;
|
|
(*rcount)++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void transport_get_read_handles(rdpTransport* transport, HANDLE* events, DWORD* count)
|
|
{
|
|
events[*count] = tcp_get_event_handle(transport->TcpIn);
|
|
(*count)++;
|
|
|
|
if (transport->SplitInputOutput)
|
|
{
|
|
events[*count] = tcp_get_event_handle(transport->TcpOut);
|
|
(*count)++;
|
|
}
|
|
|
|
if (transport->ReceiveEvent)
|
|
{
|
|
events[*count] = transport->ReceiveEvent;
|
|
(*count)++;
|
|
}
|
|
|
|
if (transport->GatewayEvent)
|
|
{
|
|
events[*count] = transport->GatewayEvent;
|
|
(*count)++;
|
|
}
|
|
}
|
|
|
|
int transport_check_fds(rdpTransport** ptransport)
|
|
{
|
|
int pos;
|
|
int status;
|
|
UINT16 length;
|
|
int recv_status;
|
|
wStream* received;
|
|
rdpTransport* transport = *ptransport;
|
|
|
|
#ifdef _WIN32
|
|
WSAResetEvent(transport->TcpIn->wsa_event);
|
|
#endif
|
|
ResetEvent(transport->ReceiveEvent);
|
|
|
|
status = transport_read_nonblocking(transport);
|
|
|
|
if (status < 0)
|
|
return status;
|
|
|
|
while ((pos = Stream_GetPosition(transport->ReceiveBuffer)) > 0)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, 0);
|
|
|
|
if (tpkt_verify_header(transport->ReceiveBuffer)) /* TPKT */
|
|
{
|
|
/* Ensure the TPKT header is available. */
|
|
if (pos <= 4)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0;
|
|
}
|
|
|
|
length = tpkt_read_header(transport->ReceiveBuffer);
|
|
}
|
|
else if (nla_verify_header(transport->ReceiveBuffer))
|
|
{
|
|
/* TSRequest */
|
|
|
|
/* Ensure the TSRequest header is available. */
|
|
if (pos <= 4)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0;
|
|
}
|
|
|
|
/* TSRequest header can be 2, 3 or 4 bytes long */
|
|
length = nla_header_length(transport->ReceiveBuffer);
|
|
|
|
if (pos < length)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0;
|
|
}
|
|
|
|
length = nla_read_header(transport->ReceiveBuffer);
|
|
}
|
|
else /* Fast Path */
|
|
{
|
|
/* Ensure the Fast Path header is available. */
|
|
if (pos <= 2)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0;
|
|
}
|
|
|
|
/* Fastpath header can be two or three bytes long. */
|
|
length = fastpath_header_length(transport->ReceiveBuffer);
|
|
|
|
if (pos < length)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0;
|
|
}
|
|
|
|
length = fastpath_read_header(NULL, transport->ReceiveBuffer);
|
|
}
|
|
|
|
if (length == 0)
|
|
{
|
|
fprintf(stderr, "transport_check_fds: protocol error, not a TPKT or Fast Path header.\n");
|
|
winpr_HexDump(Stream_Buffer(transport->ReceiveBuffer), pos);
|
|
return -1;
|
|
}
|
|
|
|
if (pos < length)
|
|
{
|
|
Stream_SetPosition(transport->ReceiveBuffer, pos);
|
|
return 0; /* Packet is not yet completely received. */
|
|
}
|
|
|
|
received = transport->ReceiveBuffer;
|
|
transport->ReceiveBuffer = StreamPool_Take(transport->ReceivePool, 0);
|
|
|
|
Stream_SetPosition(received, length);
|
|
Stream_SealLength(received);
|
|
Stream_SetPosition(received, 0);
|
|
|
|
recv_status = transport->ReceiveCallback(transport, received, transport->ReceiveExtra);
|
|
|
|
if (transport == *ptransport)
|
|
/* transport might now have been freed by rdp_client_redirect and a new rdp->transport created */
|
|
/* so only release if still valid */
|
|
Stream_Release(received);
|
|
|
|
|
|
if (recv_status < 0)
|
|
status = -1;
|
|
|
|
if (status < 0)
|
|
return status;
|
|
|
|
/* transport might now have been freed by rdp_client_redirect and a new rdp->transport created */
|
|
transport = *ptransport;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
BOOL transport_set_blocking_mode(rdpTransport* transport, BOOL blocking)
|
|
{
|
|
BOOL status;
|
|
|
|
status = TRUE;
|
|
transport->blocking = blocking;
|
|
|
|
if (transport->SplitInputOutput)
|
|
{
|
|
status &= tcp_set_blocking_mode(transport->TcpIn, blocking);
|
|
status &= tcp_set_blocking_mode(transport->TcpOut, blocking);
|
|
}
|
|
else
|
|
{
|
|
status &= tcp_set_blocking_mode(transport->TcpIn, blocking);
|
|
}
|
|
|
|
if (transport->layer == TRANSPORT_LAYER_TSG)
|
|
{
|
|
tsg_set_blocking_mode(transport->tsg, blocking);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static void* transport_client_thread(void* arg)
|
|
{
|
|
DWORD status;
|
|
DWORD nCount;
|
|
HANDLE events[32];
|
|
freerdp* instance;
|
|
rdpContext* context;
|
|
rdpTransport* transport;
|
|
|
|
transport = (rdpTransport*) arg;
|
|
instance = (freerdp*) transport->settings->instance;
|
|
context = instance->context;
|
|
|
|
while (1)
|
|
{
|
|
nCount = 0;
|
|
events[nCount++] = transport->stopEvent;
|
|
events[nCount] = transport->connectedEvent;
|
|
|
|
status = WaitForMultipleObjects(nCount + 1, events, FALSE, INFINITE);
|
|
|
|
if (WaitForSingleObject(transport->stopEvent, 0) == WAIT_OBJECT_0)
|
|
{
|
|
break;
|
|
}
|
|
|
|
transport_get_read_handles(transport, (HANDLE*) &events, &nCount);
|
|
|
|
status = WaitForMultipleObjects(nCount, events, FALSE, INFINITE);
|
|
|
|
if (WaitForSingleObject(transport->stopEvent, 0) == WAIT_OBJECT_0)
|
|
{
|
|
break;
|
|
}
|
|
|
|
if (!freerdp_check_fds(instance))
|
|
break;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
rdpTransport* transport_new(rdpSettings* settings)
|
|
{
|
|
rdpTransport* transport;
|
|
|
|
transport = (rdpTransport*) malloc(sizeof(rdpTransport));
|
|
|
|
if (transport != NULL)
|
|
{
|
|
ZeroMemory(transport, sizeof(rdpTransport));
|
|
|
|
transport->TcpIn = tcp_new(settings);
|
|
|
|
transport->settings = settings;
|
|
|
|
/* a small 0.1ms delay when transport is blocking. */
|
|
transport->SleepInterval = 100;
|
|
|
|
transport->ReceivePool = StreamPool_New(TRUE, BUFFER_SIZE);
|
|
|
|
/* receive buffer for non-blocking read. */
|
|
transport->ReceiveBuffer = StreamPool_Take(transport->ReceivePool, 0);
|
|
transport->ReceiveEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
|
|
|
|
transport->connectedEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
|
|
|
|
transport->blocking = TRUE;
|
|
|
|
transport->ReadMutex = CreateMutex(NULL, FALSE, NULL);
|
|
transport->WriteMutex = CreateMutex(NULL, FALSE, NULL);
|
|
|
|
transport->layer = TRANSPORT_LAYER_TCP;
|
|
}
|
|
|
|
return transport;
|
|
}
|
|
|
|
void transport_free(rdpTransport* transport)
|
|
{
|
|
if (transport != NULL)
|
|
{
|
|
SetEvent(transport->stopEvent);
|
|
|
|
if (transport->ReceiveBuffer)
|
|
Stream_Release(transport->ReceiveBuffer);
|
|
|
|
StreamPool_Free(transport->ReceivePool);
|
|
|
|
CloseHandle(transport->ReceiveEvent);
|
|
CloseHandle(transport->connectedEvent);
|
|
|
|
if (transport->TlsIn)
|
|
tls_free(transport->TlsIn);
|
|
|
|
if (transport->TlsOut != transport->TlsIn)
|
|
tls_free(transport->TlsOut);
|
|
|
|
tcp_free(transport->TcpIn);
|
|
|
|
if (transport->TcpOut != transport->TcpIn)
|
|
tcp_free(transport->TcpOut);
|
|
|
|
tsg_free(transport->tsg);
|
|
|
|
CloseHandle(transport->ReadMutex);
|
|
CloseHandle(transport->WriteMutex);
|
|
|
|
free(transport);
|
|
}
|
|
}
|