FreeRDP/libfreerdp/core/gateway/rdg.c
Armin Novak a49a2299b1 Refactored http parser
* Using single buffer for all data
* Added response size limit of 64MiB
* Fixed various memory leaks
2018-01-15 16:51:33 +01:00

1601 lines
33 KiB
C

/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Remote Desktop Gateway (RDG)
*
* Copyright 2015 Denis Vincent <dvincent@devolutions.net>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <winpr/crt.h>
#include <winpr/synch.h>
#include <winpr/print.h>
#include <winpr/stream.h>
#include <winpr/winsock.h>
#include <freerdp/log.h>
#include <freerdp/error.h>
#include <freerdp/utils/ringbuffer.h>
#include "rdg.h"
#include "../proxy.h"
#include "../rdp.h"
#include "../../crypto/opensslcompat.h"
#define TAG FREERDP_TAG("core.gateway.rdg")
#pragma pack(push, 1)
typedef struct rdg_packet_header
{
UINT16 type;
UINT16 reserved;
UINT32 packetLength;
} RdgPacketHeader;
#pragma pack(pop)
static BOOL rdg_write_packet(rdpRdg* rdg, wStream* sPacket)
{
int status;
wStream* sChunk;
char chunkSize[11];
sprintf_s(chunkSize, sizeof(chunkSize), "%"PRIXz"\r\n", Stream_Length(sPacket));
sChunk = Stream_New(NULL, strlen(chunkSize) + Stream_Length(sPacket) + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, strlen(chunkSize));
Stream_Write(sChunk, Stream_Buffer(sPacket), Stream_Length(sPacket));
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), Stream_Length(sChunk));
Stream_Free(sChunk, TRUE);
if (status < 0)
return FALSE;
return TRUE;
}
static wStream* rdg_receive_packet(rdpRdg* rdg)
{
int status;
wStream* s;
RdgPacketHeader* packet;
UINT32 readCount = 0;
s = Stream_New(NULL, 1024);
if (!s)
return NULL;
packet = (RdgPacketHeader*) Stream_Buffer(s);
while (readCount < sizeof(RdgPacketHeader))
{
status = BIO_read(rdg->tlsOut->bio, Stream_Pointer(s), sizeof(RdgPacketHeader) - readCount);
if (status < 0)
{
continue;
}
readCount += status;
Stream_Seek(s, readCount);
}
if (Stream_Capacity(s) < packet->packetLength)
{
if (!Stream_EnsureCapacity(s, packet->packetLength))
{
Stream_Free(s, TRUE);
return NULL;
}
packet = (RdgPacketHeader*) Stream_Buffer(s);
}
while (readCount < packet->packetLength)
{
status = BIO_read(rdg->tlsOut->bio, Stream_Pointer(s), packet->packetLength - readCount);
if (status < 0)
{
continue;
}
readCount += status;
Stream_Seek(s, readCount);
}
Stream_SealLength(s);
return s;
}
static BOOL rdg_send_handshake(rdpRdg* rdg)
{
wStream* s;
BOOL status;
s = Stream_New(NULL, 14);
if (!s)
return FALSE;
Stream_Write_UINT16(s, PKT_TYPE_HANDSHAKE_REQUEST); /* Type (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes) */
Stream_Write_UINT32(s, 14); /* PacketLength (4 bytes) */
Stream_Write_UINT8(s, 1); /* VersionMajor (1 byte) */
Stream_Write_UINT8(s, 0); /* VersionMinor (1 byte) */
Stream_Write_UINT16(s, 0); /* ClientVersion (2 bytes), must be 0 */
Stream_Write_UINT16(s, 0); /* ExtendedAuthentication (2 bytes) */
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
Stream_Free(s, TRUE);
if (status)
{
rdg->state = RDG_CLIENT_STATE_HANDSHAKE;
}
return status;
}
static BOOL rdg_send_tunnel_request(rdpRdg* rdg)
{
wStream* s;
BOOL status;
s = Stream_New(NULL, 16);
if (!s)
return FALSE;
Stream_Write_UINT16(s, PKT_TYPE_TUNNEL_CREATE); /* Type (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes) */
Stream_Write_UINT32(s, 16); /* PacketLength (4 bytes) */
Stream_Write_UINT32(s, HTTP_CAPABILITY_TYPE_QUAR_SOH); /* CapabilityFlags (4 bytes) */
Stream_Write_UINT16(s, 0); /* FieldsPresent (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes), must be 0 */
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
Stream_Free(s, TRUE);
if (status)
{
rdg->state = RDG_CLIENT_STATE_TUNNEL_CREATE;
}
return status;
}
static BOOL rdg_send_tunnel_authorization(rdpRdg* rdg)
{
int i;
wStream* s;
BOOL status;
WCHAR* clientName = NULL;
UINT16 clientNameLen;
UINT32 packetSize;
clientNameLen = ConvertToUnicode(CP_UTF8, 0, rdg->settings->ClientHostname, -1, &clientName, 0);
if (!clientName)
return FALSE;
packetSize = 12 + clientNameLen * sizeof(WCHAR);
s = Stream_New(NULL, packetSize);
if (!s)
{
free(clientName);
return FALSE;
}
Stream_Write_UINT16(s, PKT_TYPE_TUNNEL_AUTH); /* Type (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes) */
Stream_Write_UINT32(s, packetSize); /* PacketLength (4 bytes) */
Stream_Write_UINT16(s, 0); /* FieldsPresent (2 bytes) */
Stream_Write_UINT16(s, clientNameLen * 2); /* Client name string length */
for (i = 0; i < clientNameLen; i++)
Stream_Write_UINT16(s, clientName[i]);
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
Stream_Free(s, TRUE);
free(clientName);
if (status)
{
rdg->state = RDG_CLIENT_STATE_TUNNEL_AUTHORIZE;
}
return status;
}
static BOOL rdg_send_channel_create(rdpRdg* rdg)
{
int i;
wStream* s;
BOOL status;
char* serverName = rdg->settings->ServerHostname;
UINT16 serverNameLen = strlen(serverName) + 1;
UINT32 packetSize = 16 + serverNameLen * 2;
s = Stream_New(NULL, packetSize);
if (!s)
return FALSE;
Stream_Write_UINT16(s, PKT_TYPE_CHANNEL_CREATE); /* Type (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes) */
Stream_Write_UINT32(s, packetSize); /* PacketLength (4 bytes) */
Stream_Write_UINT8(s, 1); /* Number of resources. (1 byte) */
Stream_Write_UINT8(s, 0); /* Number of alternative resources (1 byte) */
Stream_Write_UINT16(s, rdg->settings->ServerPort); /* Resource port (2 bytes) */
Stream_Write_UINT16(s, 3); /* Protocol number (2 bytes) */
Stream_Write_UINT16(s, serverNameLen * 2);
for (i = 0; i < serverNameLen; i++)
{
Stream_Write_UINT16(s, serverName[i]);
}
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
Stream_Free(s, TRUE);
if (status)
{
rdg->state = RDG_CLIENT_STATE_CHANNEL_CREATE;
}
return status;
}
static wStream* rdg_build_http_request(rdpRdg* rdg, char* method)
{
wStream* s;
HttpRequest* request = NULL;
SecBuffer* ntlmToken = NULL;
char* base64NtlmToken = NULL;
assert(method != NULL);
request = http_request_new();
if (!request)
return NULL;
http_request_set_method(request, method);
http_request_set_uri(request, rdg->http->URI);
if (!request->Method || !request->URI)
return NULL;
if (rdg->ntlm)
{
ntlmToken = rdg->ntlm->outputBuffer;
if (ntlmToken)
base64NtlmToken = crypto_base64_encode(ntlmToken->pvBuffer, ntlmToken->cbBuffer);
if (base64NtlmToken)
{
http_request_set_auth_scheme(request, "NTLM");
http_request_set_auth_param(request, base64NtlmToken);
free(base64NtlmToken);
if (!request->AuthScheme || !request->AuthParam)
return NULL;
}
}
if (rdg->state == RDG_CLIENT_STATE_IN_CHANNEL_AUTHORIZED)
{
http_request_set_transfer_encoding(request, "chunked");
}
s = http_request_write(rdg->http, request);
http_request_free(request);
if (s)
Stream_SealLength(s);
return s;
}
static BOOL rdg_process_out_channel_response(rdpRdg* rdg, HttpResponse* response)
{
int status;
wStream* s;
char* token64 = NULL;
int ntlmTokenLength = 0;
BYTE* ntlmTokenData = NULL;
rdpNtlm* ntlm = rdg->ntlm;
if (response->StatusCode != HTTP_STATUS_DENIED)
{
WLog_DBG(TAG, "RDG not supported");
rdg->state = RDG_CLIENT_STATE_NOT_FOUND;
return FALSE;
}
WLog_DBG(TAG, "Out Channel authorization required");
if (ListDictionary_Contains(response->Authenticates, "NTLM"))
{
token64 = ListDictionary_GetItemValue(response->Authenticates, "NTLM");
if (!token64)
{
return FALSE;
}
crypto_base64_decode(token64, strlen(token64), &ntlmTokenData, &ntlmTokenLength);
}
if (ntlmTokenData && ntlmTokenLength)
{
ntlm->inputBuffer[0].pvBuffer = ntlmTokenData;
ntlm->inputBuffer[0].cbBuffer = ntlmTokenLength;
}
ntlm_authenticate(ntlm);
s = rdg_build_http_request(rdg, "RDG_OUT_DATA");
if (!s)
return FALSE;
status = tls_write_all(rdg->tlsOut, Stream_Buffer(s), Stream_Length(s));
Stream_Free(s, TRUE);
ntlm_free(rdg->ntlm);
rdg->ntlm = NULL;
if (status < 0)
return FALSE;
rdg->state = RDG_CLIENT_STATE_OUT_CHANNEL_AUTHORIZE;
return TRUE;
}
static BOOL rdg_process_out_channel_authorization(rdpRdg* rdg, HttpResponse* response)
{
if (response->StatusCode != HTTP_STATUS_OK)
{
rdg->state = RDG_CLIENT_STATE_CLOSED;
return FALSE;
}
WLog_DBG(TAG, "Out Channel authorization complete");
rdg->state = RDG_CLIENT_STATE_OUT_CHANNEL_AUTHORIZED;
return TRUE;
}
static BOOL rdg_process_in_channel_response(rdpRdg* rdg, HttpResponse* response)
{
int status;
wStream* s;
char* token64 = NULL;
int ntlmTokenLength = 0;
BYTE* ntlmTokenData = NULL;
rdpNtlm* ntlm = rdg->ntlm;
WLog_DBG(TAG, "In Channel authorization required");
if (ListDictionary_Contains(response->Authenticates, "NTLM"))
{
token64 = ListDictionary_GetItemValue(response->Authenticates, "NTLM");
if (!token64)
{
return FALSE;
}
crypto_base64_decode(token64, strlen(token64), &ntlmTokenData, &ntlmTokenLength);
}
if (ntlmTokenData && ntlmTokenLength)
{
ntlm->inputBuffer[0].pvBuffer = ntlmTokenData;
ntlm->inputBuffer[0].cbBuffer = ntlmTokenLength;
}
ntlm_authenticate(ntlm);
s = rdg_build_http_request(rdg, "RDG_IN_DATA");
if (!s)
return FALSE;
status = tls_write_all(rdg->tlsIn, Stream_Buffer(s), Stream_Length(s));
Stream_Free(s, TRUE);
ntlm_free(rdg->ntlm);
rdg->ntlm = NULL;
if (status < 0)
return FALSE;
rdg->state = RDG_CLIENT_STATE_IN_CHANNEL_AUTHORIZE;
return TRUE;
}
static BOOL rdg_process_in_channel_authorization(rdpRdg* rdg, HttpResponse* response)
{
wStream* s;
int status;
if (response->StatusCode != HTTP_STATUS_OK)
{
rdg->state = RDG_CLIENT_STATE_CLOSED;
return FALSE;
}
WLog_DBG(TAG, "In Channel authorization complete");
rdg->state = RDG_CLIENT_STATE_IN_CHANNEL_AUTHORIZED;
s = rdg_build_http_request(rdg, "RDG_IN_DATA");
if (!s)
return FALSE;
status = tls_write_all(rdg->tlsIn, Stream_Buffer(s), Stream_Length(s));
Stream_Free(s, TRUE);
if (status <= 0)
return FALSE;
return TRUE;
}
static BOOL rdg_process_handshake_response(rdpRdg* rdg, wStream* s)
{
HRESULT errorCode;
WLog_DBG(TAG, "Handshake response received");
if (rdg->state != RDG_CLIENT_STATE_HANDSHAKE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 12)
return FALSE;
Stream_Seek(s, 8);
Stream_Read_UINT32(s, errorCode);
if (FAILED(errorCode))
{
WLog_DBG(TAG, "Handshake error %x", errorCode);
return FALSE;
}
return rdg_send_tunnel_request(rdg);
}
static BOOL rdg_process_tunnel_response(rdpRdg* rdg, wStream* s)
{
HRESULT errorCode;
WLog_DBG(TAG, "Tunnel response received");
if (rdg->state != RDG_CLIENT_STATE_TUNNEL_CREATE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 14)
return FALSE;
Stream_Seek(s, 10);
Stream_Read_UINT32(s, errorCode);
if (FAILED(errorCode))
{
WLog_DBG(TAG, "Tunnel creation error %x", errorCode);
return FALSE;
}
return rdg_send_tunnel_authorization(rdg);
}
static BOOL rdg_process_tunnel_authorization_response(rdpRdg* rdg, wStream* s)
{
HRESULT errorCode;
WLog_DBG(TAG, "Tunnel authorization received");
if (rdg->state != RDG_CLIENT_STATE_TUNNEL_AUTHORIZE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 12)
return FALSE;
Stream_Seek(s, 8);
Stream_Read_UINT32(s, errorCode);
if (FAILED(errorCode))
{
WLog_DBG(TAG, "Tunnel authorization error %x", errorCode);
return FALSE;
}
return rdg_send_channel_create(rdg);
}
static BOOL rdg_process_channel_response(rdpRdg* rdg, wStream* s)
{
HRESULT errorCode;
WLog_DBG(TAG, "Channel response received");
if (rdg->state != RDG_CLIENT_STATE_CHANNEL_CREATE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 12)
return FALSE;
Stream_Seek(s, 8);
Stream_Read_UINT32(s, errorCode);
if (FAILED(errorCode))
{
WLog_DBG(TAG, "Channel error %x", errorCode);
return FALSE;
}
rdg->state = RDG_CLIENT_STATE_OPENED;
return TRUE;
}
static BOOL rdg_process_packet(rdpRdg* rdg, wStream* s)
{
BOOL status = TRUE;
UINT16 type;
Stream_SetPosition(s, 0);
if (Stream_GetRemainingLength(s) < 2)
return FALSE;
Stream_Peek_UINT16(s, type);
switch (type)
{
case PKT_TYPE_HANDSHAKE_RESPONSE:
status = rdg_process_handshake_response(rdg, s);
break;
case PKT_TYPE_TUNNEL_RESPONSE:
status = rdg_process_tunnel_response(rdg, s);
break;
case PKT_TYPE_TUNNEL_AUTH_RESPONSE:
status = rdg_process_tunnel_authorization_response(rdg, s);
break;
case PKT_TYPE_CHANNEL_RESPONSE:
status = rdg_process_channel_response(rdg, s);
break;
case PKT_TYPE_DATA:
assert(FALSE);
return FALSE;
}
return status;
}
static BOOL rdg_out_channel_recv(rdpRdg* rdg)
{
wStream* s;
BOOL status = TRUE;
HttpResponse* response = NULL;
switch (rdg->state)
{
case RDG_CLIENT_STATE_OUT_CHANNEL_REQUEST:
response = http_response_recv(rdg->tlsOut);
if (!response)
return FALSE;
status = rdg_process_out_channel_response(rdg, response);
http_response_free(response);
break;
case RDG_CLIENT_STATE_OUT_CHANNEL_AUTHORIZE:
response = http_response_recv(rdg->tlsOut);
if (!response)
return FALSE;
status = rdg_process_out_channel_authorization(rdg, response);
http_response_free(response);
break;
default:
s = rdg_receive_packet(rdg);
if (s)
{
status = rdg_process_packet(rdg, s);
Stream_Free(s, TRUE);
}
}
return status;
}
static BOOL rdg_in_channel_recv(rdpRdg* rdg)
{
BOOL status = TRUE;
HttpResponse* response = NULL;
switch (rdg->state)
{
case RDG_CLIENT_STATE_IN_CHANNEL_REQUEST:
response = http_response_recv(rdg->tlsIn);
if (!response)
return FALSE;
status = rdg_process_in_channel_response(rdg, response);
http_response_free(response);
break;
case RDG_CLIENT_STATE_IN_CHANNEL_AUTHORIZE:
response = http_response_recv(rdg->tlsIn);
if (!response)
return FALSE;
status = rdg_process_in_channel_authorization(rdg, response);
http_response_free(response);
break;
}
return status;
}
DWORD rdg_get_event_handles(rdpRdg* rdg, HANDLE* events, DWORD count)
{
DWORD nCount = 0;
assert(rdg != NULL);
if (events && (nCount < count))
events[nCount++] = rdg->readEvent;
else
return 0;
if (rdg->tlsOut && rdg->tlsOut->bio)
{
if (events && (nCount < count))
{
BIO_get_event(rdg->tlsOut->bio, &events[nCount]);
nCount++;
}
else
return 0;
}
if (rdg->tlsIn && rdg->tlsIn->bio)
{
if (events && (nCount < count))
{
BIO_get_event(rdg->tlsIn->bio, &events[nCount]);
nCount++;
}
else
return 0;
}
return nCount;
}
static BOOL rdg_check_event_handles(rdpRdg* rdg)
{
HANDLE event = NULL;
assert(rdg != NULL);
BIO_get_event(rdg->tlsOut->bio, &event);
if (WaitForSingleObject(event, 0) == WAIT_OBJECT_0)
{
return rdg_out_channel_recv(rdg);
}
BIO_get_event(rdg->tlsIn->bio, &event);
if (WaitForSingleObject(event, 0) == WAIT_OBJECT_0)
{
return rdg_in_channel_recv(rdg);
}
return TRUE;
}
static BOOL rdg_ncacn_http_ntlm_init(rdpRdg* rdg, rdpTls* tls)
{
rdpNtlm* ntlm = rdg->ntlm;
rdpContext* context = rdg->context;
rdpSettings* settings = context->settings;
freerdp* instance = context->instance;
if (!settings->GatewayPassword || !settings->GatewayUsername ||
!strlen(settings->GatewayPassword) || !strlen(settings->GatewayUsername))
{
if (instance->GatewayAuthenticate)
{
BOOL proceed = instance->GatewayAuthenticate(instance, &settings->GatewayUsername,
&settings->GatewayPassword, &settings->GatewayDomain);
if (!proceed)
{
freerdp_set_last_error(context, FREERDP_ERROR_CONNECT_CANCELLED);
return FALSE;
}
if (settings->GatewayUseSameCredentials)
{
if (settings->GatewayUsername)
{
free(settings->Username);
if (!(settings->Username = _strdup(settings->GatewayUsername)))
return FALSE;
}
if (settings->GatewayDomain)
{
free(settings->Domain);
if (!(settings->Domain = _strdup(settings->GatewayDomain)))
return FALSE;
}
if (settings->GatewayPassword)
{
free(settings->Password);
if (!(settings->Password = _strdup(settings->GatewayPassword)))
return FALSE;
}
}
}
}
if (!ntlm_client_init(ntlm, TRUE, settings->GatewayUsername, settings->GatewayDomain,
settings->GatewayPassword, tls->Bindings))
{
return FALSE;
}
if (!ntlm_client_make_spn(ntlm, _T("HTTP"), settings->GatewayHostname))
{
return FALSE;
}
return TRUE;
}
static BOOL rdg_send_out_channel_request(rdpRdg* rdg)
{
wStream* s = NULL;
int status;
rdg->ntlm = ntlm_new();
if (!rdg->ntlm)
return FALSE;
status = rdg_ncacn_http_ntlm_init(rdg, rdg->tlsOut);
if (!status)
return FALSE;
status = ntlm_authenticate(rdg->ntlm);
if (!status)
return FALSE;
s = rdg_build_http_request(rdg, "RDG_OUT_DATA");
if (!s)
return FALSE;
status = tls_write_all(rdg->tlsOut, Stream_Buffer(s), Stream_Length(s));
Stream_Free(s, TRUE);
if (status < 0)
return FALSE;
rdg->state = RDG_CLIENT_STATE_OUT_CHANNEL_REQUEST;
return TRUE;
}
static BOOL rdg_send_in_channel_request(rdpRdg* rdg)
{
int status;
wStream* s = NULL;
rdg->ntlm = ntlm_new();
if (!rdg->ntlm)
return FALSE;
status = rdg_ncacn_http_ntlm_init(rdg, rdg->tlsIn);
if (!status)
return FALSE;
status = ntlm_authenticate(rdg->ntlm);
if (!status)
return FALSE;
s = rdg_build_http_request(rdg, "RDG_IN_DATA");
if (!s)
return FALSE;
status = tls_write_all(rdg->tlsIn, Stream_Buffer(s), Stream_Length(s));
Stream_Free(s, TRUE);
if (status < 0)
return FALSE;
rdg->state = RDG_CLIENT_STATE_IN_CHANNEL_REQUEST;
return TRUE;
}
static BOOL rdg_tls_out_connect(rdpRdg* rdg, const char* hostname, UINT16 port, int timeout)
{
int sockfd = 0;
int status = 0;
BIO* socketBio = NULL;
BIO* bufferedBio = NULL;
rdpSettings* settings = rdg->settings;
const char* peerHostname = settings->GatewayHostname;
UINT16 peerPort = settings->GatewayPort;
BOOL isProxyConnection = proxy_prepare(settings, &peerHostname, &peerPort, TRUE);
assert(hostname != NULL);
sockfd = freerdp_tcp_connect(rdg->context, settings, peerHostname,
peerPort, timeout);
if (sockfd < 1)
{
return FALSE;
}
socketBio = BIO_new(BIO_s_simple_socket());
if (!socketBio)
{
closesocket(sockfd);
return FALSE;
}
BIO_set_fd(socketBio, sockfd, BIO_CLOSE);
bufferedBio = BIO_new(BIO_s_buffered_socket());
if (!bufferedBio)
{
BIO_free(socketBio);
return FALSE;
}
bufferedBio = BIO_push(bufferedBio, socketBio);
status = BIO_set_nonblock(bufferedBio, TRUE);
if (isProxyConnection)
{
if (!proxy_connect(settings, bufferedBio, settings->GatewayHostname, settings->GatewayPort))
return FALSE;
}
if (!status)
{
BIO_free_all(bufferedBio);
return FALSE;
}
rdg->tlsOut->hostname = settings->GatewayHostname;
rdg->tlsOut->port = settings->GatewayPort;
rdg->tlsOut->isGatewayTransport = TRUE;
status = tls_connect(rdg->tlsOut, bufferedBio);
if (status < 1)
{
return FALSE;
}
return TRUE;
}
static BOOL rdg_tls_in_connect(rdpRdg* rdg, const char* hostname, UINT16 port, int timeout)
{
int sockfd = 0;
int status = 0;
BIO* socketBio = NULL;
BIO* bufferedBio = NULL;
rdpSettings* settings = rdg->settings;
const char* peerHostname = settings->GatewayHostname;
int peerPort = settings->GatewayPort;
BOOL isProxyConnection = FALSE;
assert(hostname != NULL);
if (settings->ProxyType)
{
peerHostname = settings->ProxyHostname;
peerPort = settings->ProxyPort;
isProxyConnection = TRUE;
}
sockfd = freerdp_tcp_connect(rdg->context, settings, peerHostname,
peerPort, timeout);
if (sockfd < 1)
return FALSE;
socketBio = BIO_new(BIO_s_simple_socket());
if (!socketBio)
{
closesocket(sockfd);
return FALSE;
}
BIO_set_fd(socketBio, sockfd, BIO_CLOSE);
bufferedBio = BIO_new(BIO_s_buffered_socket());
if (!bufferedBio)
{
BIO_free(socketBio);
return FALSE;
}
bufferedBio = BIO_push(bufferedBio, socketBio);
status = BIO_set_nonblock(bufferedBio, TRUE);
if (!status)
{
BIO_free_all(bufferedBio);
return FALSE;
}
rdg->tlsIn->hostname = settings->GatewayHostname;
rdg->tlsIn->port = settings->GatewayPort;
rdg->tlsIn->isGatewayTransport = TRUE;
status = tls_connect(rdg->tlsIn, bufferedBio);
if (status < 1)
{
return FALSE;
}
return TRUE;
}
static BOOL rdg_out_channel_connect(rdpRdg* rdg, const char* hostname, UINT16 port, int timeout)
{
BOOL status;
DWORD nCount;
HANDLE events[8];
assert(hostname != NULL);
status = rdg_tls_out_connect(rdg, hostname, port, timeout);
if (!status)
return FALSE;
status = rdg_send_out_channel_request(rdg);
if (!status)
return FALSE;
nCount = rdg_get_event_handles(rdg, events, 8);
if (nCount == 0)
return FALSE;
while (rdg->state <= RDG_CLIENT_STATE_OUT_CHANNEL_AUTHORIZE)
{
WaitForMultipleObjects(nCount, events, FALSE, 100);
status = rdg_check_event_handles(rdg);
if (!status)
{
rdg->context->rdp->transport->layer = TRANSPORT_LAYER_CLOSED;
return FALSE;
}
}
return TRUE;
}
static BOOL rdg_in_channel_connect(rdpRdg* rdg, const char* hostname, UINT16 port, int timeout)
{
BOOL status;
DWORD nCount;
HANDLE events[8];
assert(hostname != NULL);
status = rdg_tls_in_connect(rdg, hostname, port, timeout);
if (!status)
return FALSE;
status = rdg_send_in_channel_request(rdg);
if (!status)
return FALSE;
nCount = rdg_get_event_handles(rdg, events, 8);
if (nCount == 0)
return FALSE;
while (rdg->state <= RDG_CLIENT_STATE_IN_CHANNEL_AUTHORIZE)
{
WaitForMultipleObjects(nCount, events, FALSE, 100);
status = rdg_check_event_handles(rdg);
if (!status)
{
rdg->context->rdp->transport->layer = TRANSPORT_LAYER_CLOSED;
return FALSE;
}
}
return TRUE;
}
static BOOL rdg_tunnel_connect(rdpRdg* rdg)
{
BOOL status;
DWORD nCount;
HANDLE events[8];
rdg_send_handshake(rdg);
nCount = rdg_get_event_handles(rdg, events, 8);
if (nCount == 0)
return FALSE;
while (rdg->state < RDG_CLIENT_STATE_OPENED)
{
WaitForMultipleObjects(nCount, events, FALSE, 100);
status = rdg_check_event_handles(rdg);
if (!status)
{
rdg->context->rdp->transport->layer = TRANSPORT_LAYER_CLOSED;
return FALSE;
}
}
return TRUE;
}
BOOL rdg_connect(rdpRdg* rdg, const char* hostname, UINT16 port, int timeout)
{
BOOL status;
assert(rdg != NULL);
status = rdg_out_channel_connect(rdg, hostname, port, timeout);
if (!status)
return FALSE;
status = rdg_in_channel_connect(rdg, hostname, port, timeout);
if (!status)
return FALSE;
status = rdg_tunnel_connect(rdg);
if (!status)
return FALSE;
return TRUE;
}
static int rdg_write_data_packet(rdpRdg* rdg, BYTE* buf, int size)
{
int status;
wStream* sChunk;
int packetSize = size + 10;
char chunkSize[11];
if (size < 1)
return 0;
sprintf_s(chunkSize, sizeof(chunkSize), "%X\r\n", packetSize);
sChunk = Stream_New(NULL, strlen(chunkSize) + packetSize + 2);
if (!sChunk)
return -1;
Stream_Write(sChunk, chunkSize, strlen(chunkSize));
Stream_Write_UINT16(sChunk, PKT_TYPE_DATA); /* Type */
Stream_Write_UINT16(sChunk, 0); /* Reserved */
Stream_Write_UINT32(sChunk, packetSize); /* Packet length */
Stream_Write_UINT16(sChunk, size); /* Data size */
Stream_Write(sChunk, buf, size); /* Data */
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), Stream_Length(sChunk));
Stream_Free(sChunk, TRUE);
if (status < 0)
return -1;
return size;
}
static BOOL rdg_process_close_packet(rdpRdg* rdg)
{
int status;
wStream* sChunk;
int packetSize = 12;
char chunkSize[11];
sprintf_s(chunkSize, sizeof(chunkSize), "%X\r\n", packetSize);
sChunk = Stream_New(NULL, strlen(chunkSize) + packetSize + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, strlen(chunkSize));
Stream_Write_UINT16(sChunk, PKT_TYPE_CLOSE_CHANNEL_RESPONSE); /* Type */
Stream_Write_UINT16(sChunk, 0); /* Reserved */
Stream_Write_UINT32(sChunk, packetSize); /* Packet length */
Stream_Write_UINT32(sChunk, 0); /* Status code */
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), Stream_Length(sChunk));
Stream_Free(sChunk, TRUE);
return (status < 0 ? FALSE : TRUE);
}
static BOOL rdg_process_keep_alive_packet(rdpRdg* rdg)
{
int status;
wStream* sChunk;
int packetSize = 8;
char chunkSize[11];
sprintf_s(chunkSize, sizeof(chunkSize), "%X\r\n", packetSize);
sChunk = Stream_New(NULL, strlen(chunkSize) + packetSize + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, strlen(chunkSize));
Stream_Write_UINT16(sChunk, PKT_TYPE_KEEPALIVE); /* Type */
Stream_Write_UINT16(sChunk, 0); /* Reserved */
Stream_Write_UINT32(sChunk, packetSize); /* Packet length */
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), Stream_Length(sChunk));
Stream_Free(sChunk, TRUE);
return (status < 0 ? FALSE : TRUE);
}
static BOOL rdg_process_unknown_packet(rdpRdg* rdg, int type)
{
WLog_WARN(TAG, "Unknown Control Packet received: %X", type);
return TRUE;
}
static BOOL rdg_process_control_packet(rdpRdg* rdg, int type, size_t packetLength)
{
wStream* s = NULL;
size_t readCount = 0;
int status;
size_t payloadSize = packetLength - sizeof(RdgPacketHeader);
if (payloadSize)
{
s = Stream_New(NULL, payloadSize);
if (!s)
return FALSE;
while (readCount < payloadSize)
{
status = BIO_read(rdg->tlsOut->bio, Stream_Pointer(s), sizeof(RdgPacketHeader) - readCount);
if (status <= 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
{
Stream_Free(s, TRUE);
return FALSE;
}
continue;
}
Stream_Seek(s, status);
readCount += status;
}
}
switch (type)
{
case PKT_TYPE_CLOSE_CHANNEL:
EnterCriticalSection(&rdg->writeSection);
status = rdg_process_close_packet(rdg);
LeaveCriticalSection(&rdg->writeSection);
break;
case PKT_TYPE_KEEPALIVE:
EnterCriticalSection(&rdg->writeSection);
status = rdg_process_keep_alive_packet(rdg);
LeaveCriticalSection(&rdg->writeSection);
break;
default:
status = rdg_process_unknown_packet(rdg, type);
break;
}
Stream_Free(s, TRUE);
return status;
}
static int rdg_read_data_packet(rdpRdg* rdg, BYTE* buffer, int size)
{
RdgPacketHeader header;
size_t readCount = 0;
int readSize;
int status;
int pending;
if (!rdg->packetRemainingCount)
{
while (readCount < sizeof(RdgPacketHeader))
{
status = BIO_read(rdg->tlsOut->bio, (BYTE*)(&header) + readCount,
sizeof(RdgPacketHeader) - readCount);
if (status <= 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
return -1;
if (!readCount)
return 0;
BIO_wait_read(rdg->tlsOut->bio, 50);
continue;
}
readCount += status;
}
if (header.type != PKT_TYPE_DATA)
{
status = rdg_process_control_packet(rdg, header.type, header.packetLength);
if (!status)
return -1;
return 0;
}
readCount = 0;
while (readCount < 2)
{
status = BIO_read(rdg->tlsOut->bio, (BYTE*)(&rdg->packetRemainingCount) + readCount, 2 - readCount);
if (status < 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
return -1;
BIO_wait_read(rdg->tlsOut->bio, 50);
continue;
}
readCount += status;
}
}
readSize = (rdg->packetRemainingCount < size ? rdg->packetRemainingCount : size);
status = BIO_read(rdg->tlsOut->bio, buffer, readSize);
if (status <= 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
{
return -1;
}
return 0;
}
rdg->packetRemainingCount -= status;
pending = BIO_pending(rdg->tlsOut->bio);
if (pending > 0)
SetEvent(rdg->readEvent);
else
ResetEvent(rdg->readEvent);
return status;
}
static int rdg_bio_write(BIO* bio, const char* buf, int num)
{
int status;
rdpRdg* rdg = (rdpRdg*) BIO_get_data(bio);
BIO_clear_flags(bio, BIO_FLAGS_WRITE);
EnterCriticalSection(&rdg->writeSection);
status = rdg_write_data_packet(rdg, (BYTE*) buf, num);
LeaveCriticalSection(&rdg->writeSection);
if (status < 0)
{
BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
return -1;
}
else if (status < num)
{
BIO_set_flags(bio, BIO_FLAGS_WRITE);
WSASetLastError(WSAEWOULDBLOCK);
}
else
{
BIO_set_flags(bio, BIO_FLAGS_WRITE);
}
return status;
}
static int rdg_bio_read(BIO* bio, char* buf, int size)
{
int status;
rdpRdg* rdg = (rdpRdg*) BIO_get_data(bio);
status = rdg_read_data_packet(rdg, (BYTE*) buf, size);
if (status < 0)
{
BIO_clear_retry_flags(bio);
return -1;
}
else if (status == 0)
{
BIO_set_retry_read(bio);
WSASetLastError(WSAEWOULDBLOCK);
return -1;
}
else
{
BIO_set_flags(bio, BIO_FLAGS_READ);
}
return status;
}
static int rdg_bio_puts(BIO* bio, const char* str)
{
return -2;
}
static int rdg_bio_gets(BIO* bio, char* str, int size)
{
return -2;
}
static long rdg_bio_ctrl(BIO* bio, int cmd, long arg1, void* arg2)
{
int status = 0;
rdpRdg* rdg = (rdpRdg*) BIO_get_data(bio);
rdpTls* tlsOut = rdg->tlsOut;
rdpTls* tlsIn = rdg->tlsIn;
if (cmd == BIO_CTRL_FLUSH)
{
(void)BIO_flush(tlsOut->bio);
(void)BIO_flush(tlsIn->bio);
status = 1;
}
else if (cmd == BIO_C_GET_EVENT)
{
if (arg2)
{
BIO_get_event(rdg->tlsOut->bio, arg2);
status = 1;
}
}
else if (cmd == BIO_C_SET_NONBLOCK)
{
status = 1;
}
else if (cmd == BIO_C_READ_BLOCKED)
{
BIO* bio = tlsOut->bio;
status = BIO_read_blocked(bio);
}
else if (cmd == BIO_C_WRITE_BLOCKED)
{
BIO* bio = tlsIn->bio;
status = BIO_write_blocked(bio);
}
else if (cmd == BIO_C_WAIT_READ)
{
int timeout = (int) arg1;
BIO* bio = tlsOut->bio;
if (BIO_read_blocked(bio))
return BIO_wait_read(bio, timeout);
else if (BIO_write_blocked(bio))
return BIO_wait_write(bio, timeout);
else
status = 1;
}
else if (cmd == BIO_C_WAIT_WRITE)
{
int timeout = (int) arg1;
BIO* bio = tlsIn->bio;
if (BIO_write_blocked(bio))
status = BIO_wait_write(bio, timeout);
else if (BIO_read_blocked(bio))
status = BIO_wait_read(bio, timeout);
else
status = 1;
}
return status;
}
static int rdg_bio_new(BIO* bio)
{
BIO_set_init(bio, 1);
BIO_set_flags(bio, BIO_FLAGS_SHOULD_RETRY);
return 1;
}
static int rdg_bio_free(BIO* bio)
{
return 1;
}
static BIO_METHOD* BIO_s_rdg(void)
{
static BIO_METHOD* bio_methods = NULL;
if (bio_methods == NULL)
{
if (!(bio_methods = BIO_meth_new(BIO_TYPE_TSG, "RDGateway")))
return NULL;
BIO_meth_set_write(bio_methods, rdg_bio_write);
BIO_meth_set_read(bio_methods, rdg_bio_read);
BIO_meth_set_puts(bio_methods, rdg_bio_puts);
BIO_meth_set_gets(bio_methods, rdg_bio_gets);
BIO_meth_set_ctrl(bio_methods, rdg_bio_ctrl);
BIO_meth_set_create(bio_methods, rdg_bio_new);
BIO_meth_set_destroy(bio_methods, rdg_bio_free);
}
return bio_methods;
}
rdpRdg* rdg_new(rdpTransport* transport)
{
rdpRdg* rdg;
RPC_CSTR stringUuid;
char bracedUuid[40];
RPC_STATUS rpcStatus;
assert(transport != NULL);
rdg = (rdpRdg*) calloc(1, sizeof(rdpRdg));
if (rdg)
{
rdg->state = RDG_CLIENT_STATE_INITIAL;
rdg->context = transport->context;
rdg->settings = rdg->context->settings;
UuidCreate(&rdg->guid);
rpcStatus = UuidToStringA(&rdg->guid, &stringUuid);
if (rpcStatus == RPC_S_OUT_OF_MEMORY)
goto rdg_alloc_error;
sprintf_s(bracedUuid, sizeof(bracedUuid), "{%s}", stringUuid);
RpcStringFreeA(&stringUuid);
rdg->tlsOut = tls_new(rdg->settings);
if (!rdg->tlsOut)
goto rdg_alloc_error;
rdg->tlsIn = tls_new(rdg->settings);
if (!rdg->tlsIn)
goto rdg_alloc_error;
rdg->http = http_context_new();
if (!rdg->http)
goto rdg_alloc_error;
http_context_set_uri(rdg->http, "/remoteDesktopGateway/");
http_context_set_accept(rdg->http, "*/*");
http_context_set_cache_control(rdg->http, "no-cache");
http_context_set_pragma(rdg->http, "no-cache");
http_context_set_connection(rdg->http, "Keep-Alive");
http_context_set_user_agent(rdg->http, "MS-RDGateway/1.0");
http_context_set_host(rdg->http, rdg->settings->GatewayHostname);
http_context_set_rdg_connection_id(rdg->http, bracedUuid);
if (!rdg->http->URI || !rdg->http->Accept || !rdg->http->CacheControl ||
!rdg->http->Pragma || !rdg->http->Connection || !rdg->http->UserAgent
|| !rdg->http->Host || !rdg->http->RdgConnectionId)
{
goto rdg_alloc_error;
}
rdg->frontBio = BIO_new(BIO_s_rdg());
if (!rdg->frontBio)
goto rdg_alloc_error;
BIO_set_data(rdg->frontBio, rdg);
rdg->readEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!rdg->readEvent)
goto rdg_alloc_error;
InitializeCriticalSection(&rdg->writeSection);
}
return rdg;
rdg_alloc_error:
rdg_free(rdg);
return NULL;
}
void rdg_free(rdpRdg* rdg)
{
if (!rdg)
return;
if (rdg->tlsOut)
{
tls_free(rdg->tlsOut);
rdg->tlsOut = NULL;
}
if (rdg->tlsIn)
{
tls_free(rdg->tlsIn);
rdg->tlsIn = NULL;
}
if (rdg->http)
{
http_context_free(rdg->http);
rdg->http = NULL;
}
if (rdg->ntlm)
{
ntlm_free(rdg->ntlm);
rdg->ntlm = NULL;
}
if (rdg->readEvent)
{
CloseHandle(rdg->readEvent);
rdg->readEvent = NULL;
}
DeleteCriticalSection(&rdg->writeSection);
free(rdg);
}