/**
* 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"
#include "rpc_fault.h"
#define TAG FREERDP_TAG("core.gateway.rdg")
/* HTTP channel response fields present flags. */
#define HTTP_CHANNEL_RESPONSE_FIELD_CHANNELID 0x1
#define HTTP_CHANNEL_RESPONSE_OPTIONAL 0x2
#define HTTP_CHANNEL_RESPONSE_FIELD_UDPPORT 0x4
/* HTTP extended auth. */
#define HTTP_EXTENDED_AUTH_NONE 0x0
#define HTTP_EXTENDED_AUTH_SC 0x1 /* Smart card authentication. */
#define HTTP_EXTENDED_AUTH_PAA 0x02 /* Pluggable authentication. */
#define HTTP_EXTENDED_AUTH_SSPI_NTLM 0x04 /* NTLM extended authentication. */
/* HTTP packet types. */
#define PKT_TYPE_HANDSHAKE_REQUEST 0x1
#define PKT_TYPE_HANDSHAKE_RESPONSE 0x2
#define PKT_TYPE_EXTENDED_AUTH_MSG 0x3
#define PKT_TYPE_TUNNEL_CREATE 0x4
#define PKT_TYPE_TUNNEL_RESPONSE 0x5
#define PKT_TYPE_TUNNEL_AUTH 0x6
#define PKT_TYPE_TUNNEL_AUTH_RESPONSE 0x7
#define PKT_TYPE_CHANNEL_CREATE 0x8
#define PKT_TYPE_CHANNEL_RESPONSE 0x9
#define PKT_TYPE_DATA 0xA
#define PKT_TYPE_SERVICE_MESSAGE 0xB
#define PKT_TYPE_REAUTH_MESSAGE 0xC
#define PKT_TYPE_KEEPALIVE 0xD
#define PKT_TYPE_CLOSE_CHANNEL 0x10
#define PKT_TYPE_CLOSE_CHANNEL_RESPONSE 0x11
/* HTTP tunnel auth fields present flags. */
#define HTTP_TUNNEL_AUTH_FIELD_SOH 0x1
/* HTTP tunnel auth response fields present flags. */
#define HTTP_TUNNEL_AUTH_RESPONSE_FIELD_REDIR_FLAGS 0x1
#define HTTP_TUNNEL_AUTH_RESPONSE_FIELD_IDLE_TIMEOUT 0x2
#define HTTP_TUNNEL_AUTH_RESPONSE_FIELD_SOH_RESPONSE 0x4
/* HTTP tunnel packet fields present flags. */
#define HTTP_TUNNEL_PACKET_FIELD_PAA_COOKIE 0x1
#define HTTP_TUNNEL_PACKET_FIELD_REAUTH 0x2
/* HTTP tunnel redir flags. */
#define HTTP_TUNNEL_REDIR_ENABLE_ALL 0x80000000
#define HTTP_TUNNEL_REDIR_DISABLE_ALL 0x40000000
#define HTTP_TUNNEL_REDIR_DISABLE_DRIVE 0x1
#define HTTP_TUNNEL_REDIR_DISABLE_PRINTER 0x2
#define HTTP_TUNNEL_REDIR_DISABLE_PORT 0x4
#define HTTP_TUNNEL_REDIR_DISABLE_CLIPBOARD 0x8
#define HTTP_TUNNEL_REDIR_DISABLE_PNP 0x10
/* HTTP tunnel response fields present flags. */
#define HTTP_TUNNEL_RESPONSE_FIELD_TUNNEL_ID 0x1
#define HTTP_TUNNEL_RESPONSE_FIELD_CAPS 0x2
#define HTTP_TUNNEL_RESPONSE_FIELD_SOH_REQ 0x4
#define HTTP_TUNNEL_RESPONSE_FIELD_CONSENT_MSG 0x10
/* HTTP capability type enumeration. */
#define HTTP_CAPABILITY_TYPE_QUAR_SOH 0x1
#define HTTP_CAPABILITY_IDLE_TIMEOUT 0x2
#define HTTP_CAPABILITY_MESSAGING_CONSENT_SIGN 0x4
#define HTTP_CAPABILITY_MESSAGING_SERVICE_MSG 0x8
#define HTTP_CAPABILITY_REAUTH 0x10
#define HTTP_CAPABILITY_UDP_TRANSPORT 0x20
struct rdp_rdg
{
rdpContext* context;
rdpSettings* settings;
BOOL attached;
BIO* frontBio;
rdpTls* tlsIn;
rdpTls* tlsOut;
rdpNtlm* ntlm;
HttpContext* http;
CRITICAL_SECTION writeSection;
UUID guid;
int state;
UINT16 packetRemainingCount;
UINT16 reserved1;
int timeout;
UINT16 extAuth;
UINT16 reserved2;
};
enum
{
RDG_CLIENT_STATE_INITIAL,
RDG_CLIENT_STATE_HANDSHAKE,
RDG_CLIENT_STATE_TUNNEL_CREATE,
RDG_CLIENT_STATE_TUNNEL_AUTHORIZE,
RDG_CLIENT_STATE_CHANNEL_CREATE,
RDG_CLIENT_STATE_OPENED,
};
#pragma pack(push, 1)
typedef struct rdg_packet_header
{
UINT16 type;
UINT16 reserved;
UINT32 packetLength;
} RdgPacketHeader;
#pragma pack(pop)
typedef struct
{
UINT32 code;
const char* name;
} t_err_mapping;
static const t_err_mapping tunnel_response_fields_present[] = {
{ HTTP_TUNNEL_RESPONSE_FIELD_TUNNEL_ID, "HTTP_TUNNEL_RESPONSE_FIELD_TUNNEL_ID" },
{ HTTP_TUNNEL_RESPONSE_FIELD_CAPS, "HTTP_TUNNEL_RESPONSE_FIELD_CAPS" },
{ HTTP_TUNNEL_RESPONSE_FIELD_SOH_REQ, "HTTP_TUNNEL_RESPONSE_FIELD_SOH_REQ" },
{ HTTP_TUNNEL_RESPONSE_FIELD_CONSENT_MSG, "HTTP_TUNNEL_RESPONSE_FIELD_CONSENT_MSG" }
};
static const t_err_mapping channel_response_fields_present[] = {
{ HTTP_CHANNEL_RESPONSE_FIELD_CHANNELID, "HTTP_CHANNEL_RESPONSE_FIELD_CHANNELID" },
{ HTTP_CHANNEL_RESPONSE_OPTIONAL, "HTTP_CHANNEL_RESPONSE_OPTIONAL" },
{ HTTP_CHANNEL_RESPONSE_FIELD_UDPPORT, "HTTP_CHANNEL_RESPONSE_FIELD_UDPPORT" }
};
static const t_err_mapping tunnel_authorization_response_fields_present[] = {
{ HTTP_TUNNEL_AUTH_RESPONSE_FIELD_REDIR_FLAGS, "HTTP_TUNNEL_AUTH_RESPONSE_FIELD_REDIR_FLAGS" },
{ HTTP_TUNNEL_AUTH_RESPONSE_FIELD_IDLE_TIMEOUT,
"HTTP_TUNNEL_AUTH_RESPONSE_FIELD_IDLE_TIMEOUT" },
{ HTTP_TUNNEL_AUTH_RESPONSE_FIELD_SOH_RESPONSE,
"HTTP_TUNNEL_AUTH_RESPONSE_FIELD_SOH_RESPONSE" }
};
static const t_err_mapping extended_auth[] = {
{ HTTP_EXTENDED_AUTH_NONE, "HTTP_EXTENDED_AUTH_NONE" },
{ HTTP_EXTENDED_AUTH_SC, "HTTP_EXTENDED_AUTH_SC" },
{ HTTP_EXTENDED_AUTH_PAA, "HTTP_EXTENDED_AUTH_PAA" },
{ HTTP_EXTENDED_AUTH_SSPI_NTLM, "HTTP_EXTENDED_AUTH_SSPI_NTLM" }
};
static const char* fields_present_to_string(UINT16 fieldsPresent, const t_err_mapping* map,
size_t elements)
{
size_t x = 0;
static char buffer[1024] = { 0 };
char fields[12];
memset(buffer, 0, sizeof(buffer));
for (x = 0; x < elements; x++)
{
if (buffer[0] != '\0')
strcat(buffer, "|");
if ((map[x].code & fieldsPresent) != 0)
strcat(buffer, map[x].name);
}
sprintf_s(fields, ARRAYSIZE(fields), " [%04" PRIx16 "]", fieldsPresent);
strcat(buffer, fields);
return buffer;
}
static const char* channel_response_fields_present_to_string(UINT16 fieldsPresent)
{
return fields_present_to_string(fieldsPresent, channel_response_fields_present,
ARRAYSIZE(channel_response_fields_present));
}
static const char* tunnel_response_fields_present_to_string(UINT16 fieldsPresent)
{
return fields_present_to_string(fieldsPresent, tunnel_response_fields_present,
ARRAYSIZE(tunnel_response_fields_present));
}
static const char* tunnel_authorization_response_fields_present_to_string(UINT16 fieldsPresent)
{
return fields_present_to_string(fieldsPresent, tunnel_authorization_response_fields_present,
ARRAYSIZE(tunnel_authorization_response_fields_present));
}
static const char* extended_auth_to_string(UINT16 auth)
{
if (auth == HTTP_EXTENDED_AUTH_NONE)
return "HTTP_EXTENDED_AUTH_NONE [0x0000]";
return fields_present_to_string(auth, extended_auth, ARRAYSIZE(extended_auth));
}
static BOOL rdg_write_packet(rdpRdg* rdg, wStream* sPacket)
{
size_t s;
int status;
wStream* sChunk;
char chunkSize[11];
sprintf_s(chunkSize, sizeof(chunkSize), "%" PRIXz "\r\n", Stream_Length(sPacket));
sChunk = Stream_New(NULL, strnlen(chunkSize, sizeof(chunkSize)) + Stream_Length(sPacket) + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, strnlen(chunkSize, sizeof(chunkSize)));
Stream_Write(sChunk, Stream_Buffer(sPacket), Stream_Length(sPacket));
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
s = Stream_Length(sChunk);
if (s > INT_MAX)
return FALSE;
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), (int)s);
Stream_Free(sChunk, TRUE);
if (status < 0)
return FALSE;
return TRUE;
}
static BOOL rdg_read_all(rdpTls* tls, BYTE* buffer, int size)
{
int status;
int readCount = 0;
BYTE* pBuffer = buffer;
while (readCount < size)
{
status = BIO_read(tls->bio, pBuffer, size - readCount);
if (status <= 0)
{
if (!BIO_should_retry(tls->bio))
return FALSE;
continue;
}
readCount += status;
pBuffer += status;
}
return TRUE;
}
static wStream* rdg_receive_packet(rdpRdg* rdg)
{
wStream* s;
const size_t header = sizeof(RdgPacketHeader);
size_t packetLength;
assert(header <= INT_MAX);
s = Stream_New(NULL, 1024);
if (!s)
return NULL;
if (!rdg_read_all(rdg->tlsOut, Stream_Buffer(s), header))
{
Stream_Free(s, TRUE);
return NULL;
}
Stream_Seek(s, 4);
Stream_Read_UINT32(s, packetLength);
if ((packetLength > INT_MAX) || !Stream_EnsureCapacity(s, packetLength) ||
(packetLength < header))
{
Stream_Free(s, TRUE);
return NULL;
}
if (!rdg_read_all(rdg->tlsOut, Stream_Buffer(s) + header, (int)packetLength - (int)header))
{
Stream_Free(s, TRUE);
return NULL;
}
Stream_SetLength(s, packetLength);
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, rdg->extAuth); /* 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;
UINT32 packetSize = 16;
UINT16 fieldsPresent = 0;
WCHAR* PAACookie = NULL;
int PAACookieLen = 0;
if (rdg->extAuth == HTTP_EXTENDED_AUTH_PAA)
{
PAACookieLen =
ConvertToUnicode(CP_UTF8, 0, rdg->settings->GatewayAccessToken, -1, &PAACookie, 0);
if (!PAACookie || (PAACookieLen < 0) || (PAACookieLen > UINT16_MAX / 2))
{
free(PAACookie);
return FALSE;
}
packetSize += 2 + (UINT32)PAACookieLen * sizeof(WCHAR);
fieldsPresent = HTTP_TUNNEL_PACKET_FIELD_PAA_COOKIE;
}
s = Stream_New(NULL, packetSize);
if (!s)
{
free(PAACookie);
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, packetSize); /* PacketLength (4 bytes) */
Stream_Write_UINT32(s, HTTP_CAPABILITY_TYPE_QUAR_SOH); /* CapabilityFlags (4 bytes) */
Stream_Write_UINT16(s, fieldsPresent); /* FieldsPresent (2 bytes) */
Stream_Write_UINT16(s, 0); /* Reserved (2 bytes), must be 0 */
if (PAACookie)
{
Stream_Write_UINT16(s, (UINT16)PAACookieLen * 2); /* PAA cookie string length */
Stream_Write_UTF16_String(s, PAACookie, (size_t)PAACookieLen);
}
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
Stream_Free(s, TRUE);
free(PAACookie);
if (status)
{
rdg->state = RDG_CLIENT_STATE_TUNNEL_CREATE;
}
return status;
}
static BOOL rdg_send_tunnel_authorization(rdpRdg* rdg)
{
wStream* s;
BOOL status;
WCHAR* clientName = NULL;
UINT32 packetSize;
int clientNameLen =
ConvertToUnicode(CP_UTF8, 0, rdg->settings->ClientHostname, -1, &clientName, 0);
if (!clientName || (clientNameLen < 0) || (clientNameLen > UINT16_MAX / 2))
{
free(clientName);
return FALSE;
}
packetSize = 12 + (UINT32)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, (UINT16)clientNameLen * 2); /* Client name string length */
Stream_Write_UTF16_String(s, clientName, (size_t)clientNameLen);
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)
{
wStream* s = NULL;
BOOL status = FALSE;
WCHAR* serverName = NULL;
int serverNameLen =
ConvertToUnicode(CP_UTF8, 0, rdg->settings->ServerHostname, -1, &serverName, 0);
UINT32 packetSize = 16 + ((UINT32)serverNameLen) * 2;
if ((serverNameLen < 0) || (serverNameLen > UINT16_MAX / 2))
goto fail;
s = Stream_New(NULL, packetSize);
if (!s)
goto fail;
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, (UINT16)rdg->settings->ServerPort); /* Resource port (2 bytes) */
Stream_Write_UINT16(s, 3); /* Protocol number (2 bytes) */
Stream_Write_UINT16(s, (UINT16)serverNameLen * 2);
Stream_Write_UTF16_String(s, serverName, (size_t)serverNameLen);
Stream_SealLength(s);
status = rdg_write_packet(rdg, s);
fail:
free(serverName);
Stream_Free(s, TRUE);
if (status)
rdg->state = RDG_CLIENT_STATE_CHANNEL_CREATE;
return status;
}
static BOOL rdg_set_ntlm_auth_header(rdpNtlm* ntlm, HttpRequest* request)
{
const SecBuffer* ntlmToken = ntlm_client_get_output_buffer(ntlm);
char* base64NtlmToken = NULL;
if (ntlmToken)
{
if (ntlmToken->cbBuffer > INT_MAX)
return FALSE;
base64NtlmToken = crypto_base64_encode(ntlmToken->pvBuffer, (int)ntlmToken->cbBuffer);
}
if (base64NtlmToken)
{
BOOL rc = http_request_set_auth_scheme(request, "NTLM") &&
http_request_set_auth_param(request, base64NtlmToken);
free(base64NtlmToken);
if (!rc)
return FALSE;
}
return TRUE;
}
static wStream* rdg_build_http_request(rdpRdg* rdg, const char* method,
const char* transferEncoding)
{
wStream* s = NULL;
HttpRequest* request = NULL;
const char* uri;
if (!rdg || !method)
return NULL;
uri = http_context_get_uri(rdg->http);
request = http_request_new();
if (!request)
return NULL;
if (!http_request_set_method(request, method) || !http_request_set_uri(request, uri))
goto out;
if (rdg->ntlm)
{
if (!rdg_set_ntlm_auth_header(rdg->ntlm, request))
goto out;
}
if (transferEncoding)
{
http_request_set_transfer_encoding(request, transferEncoding);
}
s = http_request_write(rdg->http, request);
out:
http_request_free(request);
if (s)
Stream_SealLength(s);
return s;
}
static BOOL rdg_handle_ntlm_challenge(rdpNtlm* ntlm, HttpResponse* response)
{
BOOL continueNeeded = FALSE;
size_t len;
const char* token64 = NULL;
int ntlmTokenLength = 0;
BYTE* ntlmTokenData = NULL;
long StatusCode;
if (!ntlm || !response)
return FALSE;
StatusCode = http_response_get_status_code(response);
if (StatusCode != HTTP_STATUS_DENIED)
{
WLog_DBG(TAG, "Unexpected NTLM challenge HTTP status: %ld", StatusCode);
return FALSE;
}
token64 = http_response_get_auth_token(response, "NTLM");
if (!token64)
return FALSE;
len = strlen(token64);
if (len > INT_MAX)
return FALSE;
crypto_base64_decode(token64, (int)len, &ntlmTokenData, &ntlmTokenLength);
if (ntlmTokenLength < 0)
{
free(ntlmTokenData);
return FALSE;
}
if (ntlmTokenData && ntlmTokenLength)
{
if (!ntlm_client_set_input_buffer(ntlm, FALSE, ntlmTokenData, (size_t)ntlmTokenLength))
return FALSE;
}
if (!ntlm_authenticate(ntlm, &continueNeeded))
return FALSE;
if (continueNeeded)
return FALSE;
return TRUE;
}
static BOOL rdg_skip_seed_payload(rdpTls* tls, SSIZE_T lastResponseLength)
{
BYTE seed_payload[10];
const size_t size = sizeof(seed_payload);
assert(size < SSIZE_MAX);
/* Per [MS-TSGU] 3.3.5.1 step 4, after final OK response RDG server sends
* random "seed" payload of limited size. In practice it's 10 bytes.
*/
if (lastResponseLength < (SSIZE_T)size)
{
if (!rdg_read_all(tls, seed_payload, size - lastResponseLength))
{
return FALSE;
}
}
return TRUE;
}
static BOOL rdg_process_handshake_response(rdpRdg* rdg, wStream* s)
{
UINT32 errorCode;
UINT16 serverVersion, extendedAuth;
BYTE verMajor, verMinor;
const char* error;
WLog_DBG(TAG, "Handshake response received");
if (rdg->state != RDG_CLIENT_STATE_HANDSHAKE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 10)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected 10", __FUNCTION__,
Stream_GetRemainingLength(s));
return FALSE;
}
Stream_Read_UINT32(s, errorCode);
Stream_Read_UINT8(s, verMajor);
Stream_Read_UINT8(s, verMinor);
Stream_Read_UINT16(s, serverVersion);
Stream_Read_UINT16(s, extendedAuth);
error = rpc_error_to_string(errorCode);
WLog_DBG(TAG,
"errorCode=%s, verMajor=%" PRId8 ", verMinor=%" PRId8 ", serverVersion=%" PRId16
", extendedAuth=%s",
error, verMajor, verMinor, serverVersion, extended_auth_to_string(extendedAuth));
if (FAILED(errorCode))
{
WLog_ERR(TAG, "Handshake error %s", error);
freerdp_set_last_error_log(rdg->context, errorCode);
return FALSE;
}
return rdg_send_tunnel_request(rdg);
}
static BOOL rdg_process_tunnel_response(rdpRdg* rdg, wStream* s)
{
UINT16 serverVersion, fieldsPresent;
UINT32 errorCode;
const char* error;
WLog_DBG(TAG, "Tunnel response received");
if (rdg->state != RDG_CLIENT_STATE_TUNNEL_CREATE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 10)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected 10", __FUNCTION__,
Stream_GetRemainingLength(s));
return FALSE;
}
Stream_Read_UINT16(s, serverVersion);
Stream_Read_UINT32(s, errorCode);
Stream_Read_UINT16(s, fieldsPresent);
Stream_Seek_UINT16(s); /* reserved */
error = rpc_error_to_string(errorCode);
WLog_DBG(TAG, "serverVersion=%" PRId16 ", errorCode=%s, fieldsPresent=%s", serverVersion, error,
tunnel_response_fields_present_to_string(fieldsPresent));
if (FAILED(errorCode))
{
WLog_ERR(TAG, "Tunnel creation error %s", error);
freerdp_set_last_error_log(rdg->context, errorCode);
return FALSE;
}
return rdg_send_tunnel_authorization(rdg);
}
static BOOL rdg_process_tunnel_authorization_response(rdpRdg* rdg, wStream* s)
{
UINT32 errorCode;
UINT16 fieldsPresent;
const char* error;
WLog_DBG(TAG, "Tunnel authorization received");
if (rdg->state != RDG_CLIENT_STATE_TUNNEL_AUTHORIZE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 8)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected 8", __FUNCTION__,
Stream_GetRemainingLength(s));
return FALSE;
}
Stream_Read_UINT32(s, errorCode);
Stream_Read_UINT16(s, fieldsPresent);
Stream_Seek_UINT16(s); /* reserved */
error = rpc_error_to_string(errorCode);
WLog_DBG(TAG, "errorCode=%s, fieldsPresent=%s", error,
tunnel_authorization_response_fields_present_to_string(fieldsPresent));
if (FAILED(errorCode))
{
WLog_ERR(TAG, "Tunnel authorization error %s", error);
freerdp_set_last_error_log(rdg->context, errorCode);
return FALSE;
}
return rdg_send_channel_create(rdg);
}
static BOOL rdg_process_channel_response(rdpRdg* rdg, wStream* s)
{
UINT16 fieldsPresent;
UINT32 errorCode;
const char* error;
WLog_DBG(TAG, "Channel response received");
if (rdg->state != RDG_CLIENT_STATE_CHANNEL_CREATE)
{
return FALSE;
}
if (Stream_GetRemainingLength(s) < 8)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected 8", __FUNCTION__,
Stream_GetRemainingLength(s));
return FALSE;
}
Stream_Read_UINT32(s, errorCode);
Stream_Read_UINT16(s, fieldsPresent);
Stream_Seek_UINT16(s); /* reserved */
error = rpc_error_to_string(errorCode);
WLog_DBG(TAG, "channel response errorCode=%s, fieldsPresent=%s", error,
channel_response_fields_present_to_string(fieldsPresent));
if (FAILED(errorCode))
{
WLog_ERR(TAG, "channel response errorCode=%s, fieldsPresent=%s", error,
channel_response_fields_present_to_string(fieldsPresent));
freerdp_set_last_error_log(rdg->context, 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;
UINT32 packetLength;
Stream_SetPosition(s, 0);
if (Stream_GetRemainingLength(s) < 8)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected 8", __FUNCTION__,
Stream_GetRemainingLength(s));
return FALSE;
}
Stream_Read_UINT16(s, type);
Stream_Seek_UINT16(s); /* reserved */
Stream_Read_UINT32(s, packetLength);
if (Stream_Length(s) < packetLength)
{
WLog_ERR(TAG, "[%s] Short packet %" PRIuz ", expected %" PRIuz, __FUNCTION__,
Stream_Length(s), packetLength);
return FALSE;
}
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:
WLog_ERR(TAG, "[%s] Unexpected packet type DATA", __FUNCTION__);
return FALSE;
}
return status;
}
DWORD rdg_get_event_handles(rdpRdg* rdg, HANDLE* events, DWORD count)
{
DWORD nCount = 0;
assert(rdg != NULL);
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_get_gateway_credentials(rdpContext* context)
{
rdpSettings* settings = context->settings;
freerdp* instance = context->instance;
if (!settings->GatewayPassword || !settings->GatewayUsername ||
!strlen(settings->GatewayPassword) || !strlen(settings->GatewayUsername))
{
if (freerdp_shall_disconnect(instance))
return FALSE;
if (!instance->GatewayAuthenticate)
{
freerdp_set_last_error_log(context, FREERDP_ERROR_CONNECT_NO_OR_MISSING_CREDENTIALS);
return FALSE;
}
else
{
BOOL proceed =
instance->GatewayAuthenticate(instance, &settings->GatewayUsername,
&settings->GatewayPassword, &settings->GatewayDomain);
if (!proceed)
{
freerdp_set_last_error_log(context,
FREERDP_ERROR_CONNECT_NO_OR_MISSING_CREDENTIALS);
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;
}
}
}
}
return TRUE;
}
static BOOL rdg_ntlm_init(rdpRdg* rdg, rdpTls* tls)
{
BOOL continueNeeded = FALSE;
rdpContext* context = rdg->context;
rdpSettings* settings = context->settings;
rdg->ntlm = ntlm_new();
if (!rdg->ntlm)
return FALSE;
if (!rdg_get_gateway_credentials(context))
return FALSE;
if (!ntlm_client_init(rdg->ntlm, TRUE, settings->GatewayUsername, settings->GatewayDomain,
settings->GatewayPassword, tls->Bindings))
return FALSE;
if (!ntlm_client_make_spn(rdg->ntlm, _T("HTTP"), settings->GatewayHostname))
return FALSE;
if (!ntlm_authenticate(rdg->ntlm, &continueNeeded))
return FALSE;
return continueNeeded;
}
static BOOL rdg_send_http_request(rdpRdg* rdg, rdpTls* tls, const char* method,
const char* transferEncoding)
{
size_t sz;
wStream* s = NULL;
int status = -1;
s = rdg_build_http_request(rdg, method, transferEncoding);
if (!s)
return FALSE;
sz = Stream_Length(s);
if (sz <= INT_MAX)
status = tls_write_all(tls, Stream_Buffer(s), (int)sz);
Stream_Free(s, TRUE);
return (status >= 0);
}
static BOOL rdg_tls_connect(rdpRdg* rdg, rdpTls* tls, const char* peerAddress, int timeout)
{
int sockfd = 0;
long status = 0;
BIO* socketBio = NULL;
BIO* bufferedBio = NULL;
rdpSettings* settings = rdg->settings;
const char* peerHostname = settings->GatewayHostname;
UINT16 peerPort = (UINT16)settings->GatewayPort;
const char *proxyUsername, *proxyPassword;
BOOL isProxyConnection =
proxy_prepare(settings, &peerHostname, &peerPort, &proxyUsername, &proxyPassword);
if (settings->GatewayPort > UINT16_MAX)
return FALSE;
sockfd = freerdp_tcp_connect(rdg->context, settings, peerAddress ? peerAddress : peerHostname,
peerPort, timeout);
if (sockfd < 0)
{
return FALSE;
}
socketBio = BIO_new(BIO_s_simple_socket());
if (!socketBio)
{
closesocket((SOCKET)sockfd);
return FALSE;
}
BIO_set_fd(socketBio, sockfd, BIO_CLOSE);
bufferedBio = BIO_new(BIO_s_buffered_socket());
if (!bufferedBio)
{
BIO_free_all(socketBio);
return FALSE;
}
bufferedBio = BIO_push(bufferedBio, socketBio);
status = BIO_set_nonblock(bufferedBio, TRUE);
if (isProxyConnection)
{
if (!proxy_connect(settings, bufferedBio, proxyUsername, proxyPassword,
settings->GatewayHostname, (UINT16)settings->GatewayPort))
{
BIO_free_all(bufferedBio);
return FALSE;
}
}
if (!status)
{
BIO_free_all(bufferedBio);
return FALSE;
}
tls->hostname = settings->GatewayHostname;
tls->port = (int)settings->GatewayPort;
tls->isGatewayTransport = TRUE;
status = tls_connect(tls, bufferedBio);
if (status < 1)
{
rdpContext* context = rdg->context;
if (status < 0)
{
freerdp_set_last_error_if_not(context, FREERDP_ERROR_TLS_CONNECT_FAILED);
}
else
{
freerdp_set_last_error_if_not(context, FREERDP_ERROR_CONNECT_CANCELLED);
}
return FALSE;
}
return (status >= 1);
}
static BOOL rdg_establish_data_connection(rdpRdg* rdg, rdpTls* tls, const char* method,
const char* peerAddress, int timeout, BOOL* rpcFallback)
{
HttpResponse* response = NULL;
long statusCode;
SSIZE_T bodyLength;
long StatusCode;
if (!rdg_tls_connect(rdg, tls, peerAddress, timeout))
return FALSE;
if (rdg->extAuth == HTTP_EXTENDED_AUTH_NONE)
{
if (!rdg_ntlm_init(rdg, tls))
return FALSE;
if (!rdg_send_http_request(rdg, tls, method, NULL))
return FALSE;
response = http_response_recv(tls, TRUE);
if (!response)
return FALSE;
StatusCode = http_response_get_status_code(response);
switch (StatusCode)
{
case HTTP_STATUS_NOT_FOUND:
{
WLog_INFO(TAG, "RD Gateway does not support HTTP transport.");
if (rpcFallback)
*rpcFallback = TRUE;
http_response_free(response);
return FALSE;
}
default:
break;
}
if (!rdg_handle_ntlm_challenge(rdg->ntlm, response))
{
http_response_free(response);
return FALSE;
}
http_response_free(response);
}
if (!rdg_send_http_request(rdg, tls, method, NULL))
return FALSE;
ntlm_free(rdg->ntlm);
rdg->ntlm = NULL;
response = http_response_recv(tls, TRUE);
if (!response)
return FALSE;
statusCode = http_response_get_status_code(response);
bodyLength = http_response_get_body_length(response);
http_response_free(response);
WLog_DBG(TAG, "%s authorization result: %d", method, statusCode);
switch (statusCode)
{
case HTTP_STATUS_OK:
break;
case HTTP_STATUS_DENIED:
freerdp_set_last_error_log(rdg->context, FREERDP_ERROR_CONNECT_ACCESS_DENIED);
return FALSE;
default:
return FALSE;
}
if (strcmp(method, "RDG_OUT_DATA") == 0)
{
if (!rdg_skip_seed_payload(tls, bodyLength))
return FALSE;
}
else
{
if (!rdg_send_http_request(rdg, tls, method, "chunked"))
return FALSE;
}
return TRUE;
}
static BOOL rdg_tunnel_connect(rdpRdg* rdg)
{
BOOL status;
wStream* s;
rdg_send_handshake(rdg);
while (rdg->state < RDG_CLIENT_STATE_OPENED)
{
status = FALSE;
s = rdg_receive_packet(rdg);
if (s)
{
status = rdg_process_packet(rdg, s);
Stream_Free(s, TRUE);
}
if (!status)
{
rdg->context->rdp->transport->layer = TRANSPORT_LAYER_CLOSED;
return FALSE;
}
}
return TRUE;
}
BOOL rdg_connect(rdpRdg* rdg, int timeout, BOOL* rpcFallback)
{
BOOL status;
SOCKET outConnSocket = 0;
char* peerAddress = NULL;
assert(rdg != NULL);
status =
rdg_establish_data_connection(rdg, rdg->tlsOut, "RDG_OUT_DATA", NULL, timeout, rpcFallback);
if (status)
{
/* Establish IN connection with the same peer/server as OUT connection,
* even when server hostname resolves to different IP addresses.
*/
BIO_get_socket(rdg->tlsOut->underlying, &outConnSocket);
peerAddress = freerdp_tcp_get_peer_address(outConnSocket);
status = rdg_establish_data_connection(rdg, rdg->tlsIn, "RDG_IN_DATA", peerAddress, timeout,
NULL);
free(peerAddress);
}
if (!status)
{
rdg->context->rdp->transport->layer = TRANSPORT_LAYER_CLOSED;
return FALSE;
}
status = rdg_tunnel_connect(rdg);
if (!status)
return FALSE;
return TRUE;
}
static int rdg_write_data_packet(rdpRdg* rdg, const BYTE* buf, int isize)
{
int status;
size_t s;
wStream* sChunk;
size_t size = (size_t)isize;
size_t packetSize = size + 10;
char chunkSize[11];
if ((isize < 0) || (isize > UINT16_MAX))
return -1;
if (size < 1)
return 0;
sprintf_s(chunkSize, sizeof(chunkSize), "%" PRIxz "\r\n", packetSize);
sChunk = Stream_New(NULL, strnlen(chunkSize, sizeof(chunkSize)) + packetSize + 2);
if (!sChunk)
return -1;
Stream_Write(sChunk, chunkSize, strnlen(chunkSize, sizeof(chunkSize)));
Stream_Write_UINT16(sChunk, PKT_TYPE_DATA); /* Type */
Stream_Write_UINT16(sChunk, 0); /* Reserved */
Stream_Write_UINT32(sChunk, (UINT32)packetSize); /* Packet length */
Stream_Write_UINT16(sChunk, (UINT16)size); /* Data size */
Stream_Write(sChunk, buf, size); /* Data */
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
s = Stream_Length(sChunk);
if (s > INT_MAX)
return -1;
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), (int)s);
Stream_Free(sChunk, TRUE);
if (status < 0)
return -1;
return (int)size;
}
static BOOL rdg_process_close_packet(rdpRdg* rdg)
{
int status = -1;
size_t s;
wStream* sChunk;
UINT32 packetSize = 12;
char chunkSize[11];
int chunkLen = sprintf_s(chunkSize, sizeof(chunkSize), "%" PRIx32 "\r\n", packetSize);
if (chunkLen < 0)
return FALSE;
sChunk = Stream_New(NULL, (size_t)chunkLen + packetSize + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, (size_t)chunkLen);
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);
s = Stream_Length(sChunk);
if (s <= INT_MAX)
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), (int)s);
Stream_Free(sChunk, TRUE);
return (status < 0 ? FALSE : TRUE);
}
static BOOL rdg_process_keep_alive_packet(rdpRdg* rdg)
{
int status = -1;
size_t s;
wStream* sChunk;
size_t packetSize = 8;
char chunkSize[11];
int chunkLen = sprintf_s(chunkSize, sizeof(chunkSize), "%" PRIxz "\r\n", packetSize);
if ((chunkLen < 0) || (packetSize > UINT32_MAX))
return FALSE;
sChunk = Stream_New(NULL, (size_t)chunkLen + packetSize + 2);
if (!sChunk)
return FALSE;
Stream_Write(sChunk, chunkSize, (size_t)chunkLen);
Stream_Write_UINT16(sChunk, PKT_TYPE_KEEPALIVE); /* Type */
Stream_Write_UINT16(sChunk, 0); /* Reserved */
Stream_Write_UINT32(sChunk, (UINT32)packetSize); /* Packet length */
Stream_Write(sChunk, "\r\n", 2);
Stream_SealLength(sChunk);
s = Stream_Length(sChunk);
if (s <= INT_MAX)
status = tls_write_all(rdg->tlsIn, Stream_Buffer(sChunk), (int)s);
Stream_Free(sChunk, TRUE);
return (status < 0 ? FALSE : TRUE);
}
static BOOL rdg_process_unknown_packet(rdpRdg* rdg, int type)
{
WINPR_UNUSED(rdg);
WINPR_UNUSED(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 (packetLength < sizeof(RdgPacketHeader))
return FALSE;
assert(sizeof(RdgPacketHeader) < INT_MAX);
if (payloadSize)
{
s = Stream_New(NULL, payloadSize);
if (!s)
return FALSE;
while (readCount < payloadSize)
{
status =
BIO_read(rdg->tlsOut->bio, Stream_Pointer(s), (int)payloadSize - (int)readCount);
if (status <= 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
{
Stream_Free(s, TRUE);
return FALSE;
}
continue;
}
Stream_Seek(s, (size_t)status);
readCount += (size_t)status;
if (readCount > INT_MAX)
{
Stream_Free(s, TRUE);
return FALSE;
}
}
}
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;
if (!rdg->packetRemainingCount)
{
assert(sizeof(RdgPacketHeader) < INT_MAX);
while (readCount < sizeof(RdgPacketHeader))
{
status = BIO_read(rdg->tlsOut->bio, (BYTE*)(&header) + readCount,
(int)sizeof(RdgPacketHeader) - (int)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 += (size_t)status;
if (readCount > INT_MAX)
return -1;
}
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 - (int)readCount);
if (status < 0)
{
if (!BIO_should_retry(rdg->tlsOut->bio))
return -1;
BIO_wait_read(rdg->tlsOut->bio, 50);
continue;
}
readCount += (size_t)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;
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, (const 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)
{
WINPR_UNUSED(bio);
WINPR_UNUSED(str);
return -2;
}
static int rdg_bio_gets(BIO* bio, char* str, int size)
{
WINPR_UNUSED(bio);
WINPR_UNUSED(str);
WINPR_UNUSED(size);
return -2;
}
static long rdg_bio_ctrl(BIO* bio, int cmd, long arg1, void* arg2)
{
long status = -1;
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_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;
}
else if (cmd == BIO_C_GET_EVENT || cmd == BIO_C_GET_FD)
{
/*
* A note about BIO_C_GET_FD:
* Even if two FDs are part of RDG, only one FD can be returned here.
*
* In FreeRDP, BIO FDs are only used for polling, so it is safe to use the outgoing FD only
*
* See issue #3602
*/
status = BIO_ctrl(tlsOut->bio, cmd, arg1, arg2);
}
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)
{
WINPR_UNUSED(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(rdpContext* context)
{
rdpRdg* rdg;
RPC_CSTR stringUuid;
char bracedUuid[40];
RPC_STATUS rpcStatus;
if (!context)
return NULL;
rdg = (rdpRdg*)calloc(1, sizeof(rdpRdg));
if (rdg)
{
rdg->state = RDG_CLIENT_STATE_INITIAL;
rdg->context = context;
rdg->settings = rdg->context->settings;
rdg->extAuth = HTTP_EXTENDED_AUTH_NONE;
if (rdg->settings->GatewayAccessToken)
rdg->extAuth = HTTP_EXTENDED_AUTH_PAA;
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;
if (!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))
{
goto rdg_alloc_error;
}
if (rdg->extAuth != HTTP_EXTENDED_AUTH_NONE)
{
switch (rdg->extAuth)
{
case HTTP_EXTENDED_AUTH_PAA:
if (!http_context_set_rdg_auth_scheme(rdg->http, "PAA"))
goto rdg_alloc_error;
break;
default:
WLog_DBG(TAG, "RDG extended authentication method %d not supported",
rdg->extAuth);
}
}
rdg->frontBio = BIO_new(BIO_s_rdg());
if (!rdg->frontBio)
goto rdg_alloc_error;
BIO_set_data(rdg->frontBio, rdg);
InitializeCriticalSection(&rdg->writeSection);
}
return rdg;
rdg_alloc_error:
rdg_free(rdg);
return NULL;
}
void rdg_free(rdpRdg* rdg)
{
if (!rdg)
return;
tls_free(rdg->tlsOut);
tls_free(rdg->tlsIn);
http_context_free(rdg->http);
ntlm_free(rdg->ntlm);
if (!rdg->attached)
BIO_free_all(rdg->frontBio);
DeleteCriticalSection(&rdg->writeSection);
free(rdg);
}
BIO* rdg_get_front_bio_and_take_ownership(rdpRdg* rdg)
{
if (!rdg)
return NULL;
rdg->attached = TRUE;
return rdg->frontBio;
}