Milestone 5: deliver embedded RDP sessions and lifecycle hardening
This commit is contained in:
Keith Smith
642
third_party/FreeRDP/channels/remdesk/server/remdesk_main.c
vendored
Normal file
642
third_party/FreeRDP/channels/remdesk/server/remdesk_main.c
vendored
Normal file
@@ -0,0 +1,642 @@
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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Remote Assistance Virtual Channel
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*
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* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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* Copyright 2015 Thincast Technologies GmbH
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* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
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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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#include <freerdp/config.h>
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#include <winpr/crt.h>
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#include <winpr/print.h>
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#include <winpr/stream.h>
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#include <freerdp/freerdp.h>
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#include "remdesk_main.h"
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#include "remdesk_common.h"
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_virtual_channel_write(RemdeskServerContext* context, wStream* s)
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{
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const size_t len = Stream_Length(s);
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WINPR_ASSERT(len <= UINT32_MAX);
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ULONG BytesWritten = 0;
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BOOL status = WTSVirtualChannelWrite(context->priv->ChannelHandle, Stream_BufferAs(s, char),
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(UINT32)len, &BytesWritten);
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return (status) ? CHANNEL_RC_OK : ERROR_INTERNAL_ERROR;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_send_ctl_result_pdu(RemdeskServerContext* context, UINT32 result)
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{
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wStream* s = nullptr;
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REMDESK_CTL_RESULT_PDU pdu;
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UINT error = 0;
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pdu.result = result;
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if ((error = remdesk_prepare_ctl_header(&(pdu.ctlHeader), REMDESK_CTL_RESULT, 4)))
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{
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WLog_ERR(TAG, "remdesk_prepare_ctl_header failed with error %" PRIu32 "!", error);
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return error;
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}
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s = Stream_New(nullptr, REMDESK_CHANNEL_CTL_SIZE + pdu.ctlHeader.ch.DataLength);
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if (!s)
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{
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WLog_ERR(TAG, "Stream_New failed!");
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return CHANNEL_RC_NO_MEMORY;
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}
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if ((error = remdesk_write_ctl_header(s, &(pdu.ctlHeader))))
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{
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WLog_ERR(TAG, "remdesk_write_ctl_header failed with error %" PRIu32 "!", error);
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goto out;
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}
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Stream_Write_UINT32(s, pdu.result); /* result (4 bytes) */
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Stream_SealLength(s);
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if ((error = remdesk_virtual_channel_write(context, s)))
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WLog_ERR(TAG, "remdesk_virtual_channel_write failed with error %" PRIu32 "!", error);
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out:
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Stream_Free(s, TRUE);
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return error;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_send_ctl_version_info_pdu(RemdeskServerContext* context)
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{
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wStream* s = nullptr;
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REMDESK_CTL_VERSION_INFO_PDU pdu;
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UINT error = 0;
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if ((error = remdesk_prepare_ctl_header(&(pdu.ctlHeader), REMDESK_CTL_VERSIONINFO, 8)))
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{
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WLog_ERR(TAG, "remdesk_prepare_ctl_header failed with error %" PRIu32 "!", error);
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return error;
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}
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pdu.versionMajor = 1;
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pdu.versionMinor = 2;
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s = Stream_New(nullptr, REMDESK_CHANNEL_CTL_SIZE + pdu.ctlHeader.ch.DataLength);
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if (!s)
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{
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WLog_ERR(TAG, "Stream_New failed!");
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return CHANNEL_RC_NO_MEMORY;
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}
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if ((error = remdesk_write_ctl_header(s, &(pdu.ctlHeader))))
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{
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WLog_ERR(TAG, "remdesk_write_ctl_header failed with error %" PRIu32 "!", error);
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goto out;
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}
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Stream_Write_UINT32(s, pdu.versionMajor); /* versionMajor (4 bytes) */
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Stream_Write_UINT32(s, pdu.versionMinor); /* versionMinor (4 bytes) */
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Stream_SealLength(s);
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if ((error = remdesk_virtual_channel_write(context, s)))
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WLog_ERR(TAG, "remdesk_virtual_channel_write failed with error %" PRIu32 "!", error);
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out:
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Stream_Free(s, TRUE);
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return error;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_recv_ctl_version_info_pdu(WINPR_ATTR_UNUSED RemdeskServerContext* context,
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wStream* s,
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WINPR_ATTR_UNUSED REMDESK_CHANNEL_HEADER* header)
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{
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UINT32 versionMajor = 0;
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UINT32 versionMinor = 0;
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if (!Stream_CheckAndLogRequiredLength(TAG, s, 8))
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return ERROR_INVALID_DATA;
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Stream_Read_UINT32(s, versionMajor); /* versionMajor (4 bytes) */
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Stream_Read_UINT32(s, versionMinor); /* versionMinor (4 bytes) */
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if ((versionMajor != 1) || (versionMinor != 2))
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{
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WLog_ERR(TAG, "REMOTEDESKTOP_CTL_VERSIONINFO_PACKET invalid version %" PRIu32 ".%" PRIu32,
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versionMajor, versionMinor);
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return ERROR_INVALID_DATA;
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}
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return CHANNEL_RC_OK;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_recv_ctl_remote_control_desktop_pdu(RemdeskServerContext* context, wStream* s,
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REMDESK_CHANNEL_HEADER* header)
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{
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size_t cchStringW = 0;
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REMDESK_CTL_REMOTE_CONTROL_DESKTOP_PDU pdu = WINPR_C_ARRAY_INIT;
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UINT error = 0;
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UINT32 msgLength = header->DataLength - 4;
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const WCHAR* pStringW = Stream_ConstPointer(s);
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const WCHAR* raConnectionStringW = pStringW;
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while ((msgLength > 0) && pStringW[cchStringW])
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{
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msgLength -= 2;
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cchStringW++;
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}
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if (pStringW[cchStringW] || !cchStringW)
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return ERROR_INVALID_DATA;
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cchStringW++;
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const size_t cbRaConnectionStringW = cchStringW * sizeof(WCHAR);
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pdu.raConnectionString = ConvertWCharNToUtf8Alloc(
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raConnectionStringW, cbRaConnectionStringW / sizeof(WCHAR), nullptr);
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if (!pdu.raConnectionString)
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return ERROR_INTERNAL_ERROR;
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WLog_INFO(TAG, "RaConnectionString: %s", pdu.raConnectionString);
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free(pdu.raConnectionString);
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if ((error = remdesk_send_ctl_result_pdu(context, 0)))
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WLog_ERR(TAG, "remdesk_send_ctl_result_pdu failed with error %" PRIu32 "!", error);
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return error;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_recv_ctl_authenticate_pdu(WINPR_ATTR_UNUSED RemdeskServerContext* context,
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wStream* s, REMDESK_CHANNEL_HEADER* header)
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{
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size_t cchTmpStringW = 0;
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const WCHAR* expertBlobW = nullptr;
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REMDESK_CTL_AUTHENTICATE_PDU pdu = WINPR_C_ARRAY_INIT;
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UINT32 msgLength = header->DataLength - 4;
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const WCHAR* pStringW = Stream_ConstPointer(s);
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const WCHAR* raConnectionStringW = pStringW;
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while ((msgLength > 0) && pStringW[cchTmpStringW])
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{
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msgLength -= 2;
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cchTmpStringW++;
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}
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if (pStringW[cchTmpStringW] || !cchTmpStringW)
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return ERROR_INVALID_DATA;
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cchTmpStringW++;
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const size_t cbRaConnectionStringW = cchTmpStringW * sizeof(WCHAR);
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pStringW += cchTmpStringW;
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expertBlobW = pStringW;
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size_t cchStringW = 0;
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while ((msgLength > 0) && pStringW[cchStringW])
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{
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msgLength -= 2;
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cchStringW++;
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}
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if (pStringW[cchStringW] || !cchStringW)
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return ERROR_INVALID_DATA;
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cchStringW++;
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const size_t cbExpertBlobW = cchStringW * sizeof(WCHAR);
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pdu.raConnectionString = ConvertWCharNToUtf8Alloc(
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raConnectionStringW, cbRaConnectionStringW / sizeof(WCHAR), nullptr);
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if (!pdu.raConnectionString)
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return ERROR_INTERNAL_ERROR;
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pdu.expertBlob = ConvertWCharNToUtf8Alloc(expertBlobW, cbExpertBlobW / sizeof(WCHAR), nullptr);
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if (!pdu.expertBlob)
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{
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free(pdu.raConnectionString);
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return ERROR_INTERNAL_ERROR;
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}
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WLog_INFO(TAG, "RaConnectionString: %s ExpertBlob: %s", pdu.raConnectionString, pdu.expertBlob);
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free(pdu.raConnectionString);
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free(pdu.expertBlob);
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return CHANNEL_RC_OK;
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}
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/**
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* Function description
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*
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* @return 0 on success, otherwise a Win32 error code
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*/
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static UINT remdesk_recv_ctl_verify_password_pdu(RemdeskServerContext* context, wStream* s,
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REMDESK_CHANNEL_HEADER* header)
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{
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REMDESK_CTL_VERIFY_PASSWORD_PDU pdu = WINPR_C_ARRAY_INIT;
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if (!Stream_CheckAndLogRequiredLength(TAG, s, 8))
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return ERROR_INVALID_DATA;
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const WCHAR* expertBlobW = Stream_ConstPointer(s);
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if (header->DataLength < 4)
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return ERROR_INVALID_PARAMETER;
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const size_t cbExpertBlobW = header->DataLength - 4;
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pdu.expertBlob = ConvertWCharNToUtf8Alloc(expertBlobW, cbExpertBlobW / sizeof(WCHAR), nullptr);
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if (!pdu.expertBlob)
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return ERROR_INTERNAL_ERROR;
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WLog_INFO(TAG, "ExpertBlob: %s", pdu.expertBlob);
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// TODO: Callback?
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free(pdu.expertBlob);
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return remdesk_send_ctl_result_pdu(context, 0);
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}
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/**
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* Function description
|
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*
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* @return 0 on success, otherwise a Win32 error code
|
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*/
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static UINT remdesk_recv_ctl_pdu(RemdeskServerContext* context, wStream* s,
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REMDESK_CHANNEL_HEADER* header)
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{
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UINT error = CHANNEL_RC_OK;
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UINT32 msgType = 0;
|
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|
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if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
|
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return ERROR_INVALID_DATA;
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Stream_Read_UINT32(s, msgType); /* msgType (4 bytes) */
|
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WLog_INFO(TAG, "msgType: %" PRIu32 "", msgType);
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switch (msgType)
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{
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case REMDESK_CTL_REMOTE_CONTROL_DESKTOP:
|
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if ((error = remdesk_recv_ctl_remote_control_desktop_pdu(context, s, header)))
|
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{
|
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WLog_ERR(TAG,
|
||||
"remdesk_recv_ctl_remote_control_desktop_pdu failed with error %" PRIu32
|
||||
"!",
|
||||
error);
|
||||
return error;
|
||||
}
|
||||
|
||||
break;
|
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|
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case REMDESK_CTL_AUTHENTICATE:
|
||||
if ((error = remdesk_recv_ctl_authenticate_pdu(context, s, header)))
|
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{
|
||||
WLog_ERR(TAG, "remdesk_recv_ctl_authenticate_pdu failed with error %" PRIu32 "!",
|
||||
error);
|
||||
return error;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_DISCONNECT:
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_VERSIONINFO:
|
||||
if ((error = remdesk_recv_ctl_version_info_pdu(context, s, header)))
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_recv_ctl_version_info_pdu failed with error %" PRIu32 "!",
|
||||
error);
|
||||
return error;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_ISCONNECTED:
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_VERIFY_PASSWORD:
|
||||
if ((error = remdesk_recv_ctl_verify_password_pdu(context, s, header)))
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_recv_ctl_verify_password_pdu failed with error %" PRIu32 "!",
|
||||
error);
|
||||
return error;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_EXPERT_ON_VISTA:
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_RANOVICE_NAME:
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_RAEXPERT_NAME:
|
||||
break;
|
||||
|
||||
case REMDESK_CTL_TOKEN:
|
||||
break;
|
||||
|
||||
default:
|
||||
WLog_ERR(TAG, "remdesk_recv_control_pdu: unknown msgType: %" PRIu32 "", msgType);
|
||||
error = ERROR_INVALID_DATA;
|
||||
break;
|
||||
}
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* Function description
|
||||
*
|
||||
* @return 0 on success, otherwise a Win32 error code
|
||||
*/
|
||||
static UINT remdesk_server_receive_pdu(RemdeskServerContext* context, wStream* s)
|
||||
{
|
||||
UINT error = CHANNEL_RC_OK;
|
||||
REMDESK_CHANNEL_HEADER header;
|
||||
|
||||
if ((error = remdesk_read_channel_header(s, &header)))
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_read_channel_header failed with error %" PRIu32 "!", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
if (strcmp(header.ChannelName, "RC_CTL") == 0)
|
||||
{
|
||||
if ((error = remdesk_recv_ctl_pdu(context, s, &header)))
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_recv_ctl_pdu failed with error %" PRIu32 "!", error);
|
||||
return error;
|
||||
}
|
||||
}
|
||||
else if (strcmp(header.ChannelName, "70") == 0)
|
||||
{
|
||||
}
|
||||
else if (strcmp(header.ChannelName, "71") == 0)
|
||||
{
|
||||
}
|
||||
else if (strcmp(header.ChannelName, ".") == 0)
|
||||
{
|
||||
}
|
||||
else if (strcmp(header.ChannelName, "1000.") == 0)
|
||||
{
|
||||
}
|
||||
else if (strcmp(header.ChannelName, "RA_FX") == 0)
|
||||
{
|
||||
}
|
||||
else
|
||||
{
|
||||
}
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
static DWORD WINAPI remdesk_server_thread(LPVOID arg)
|
||||
{
|
||||
void* buffer = nullptr;
|
||||
HANDLE events[8] = WINPR_C_ARRAY_INIT;
|
||||
HANDLE ChannelEvent = nullptr;
|
||||
DWORD BytesReturned = 0;
|
||||
UINT error = 0;
|
||||
RemdeskServerContext* context = (RemdeskServerContext*)arg;
|
||||
WINPR_ASSERT(context);
|
||||
wStream* s = Stream_New(nullptr, 4096);
|
||||
|
||||
if (!s)
|
||||
{
|
||||
WLog_ERR(TAG, "Stream_New failed!");
|
||||
error = CHANNEL_RC_NO_MEMORY;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (WTSVirtualChannelQuery(context->priv->ChannelHandle, WTSVirtualEventHandle, &buffer,
|
||||
&BytesReturned) == TRUE)
|
||||
{
|
||||
if (BytesReturned == sizeof(HANDLE))
|
||||
ChannelEvent = *(HANDLE*)buffer;
|
||||
|
||||
WTSFreeMemory(buffer);
|
||||
}
|
||||
else
|
||||
{
|
||||
WLog_ERR(TAG, "WTSVirtualChannelQuery failed!");
|
||||
error = ERROR_INTERNAL_ERROR;
|
||||
goto out;
|
||||
}
|
||||
|
||||
{
|
||||
DWORD nCount = 0;
|
||||
events[nCount++] = ChannelEvent;
|
||||
events[nCount++] = context->priv->StopEvent;
|
||||
|
||||
if ((error = remdesk_send_ctl_version_info_pdu(context)))
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_send_ctl_version_info_pdu failed with error %" PRIu32 "!",
|
||||
error);
|
||||
goto out;
|
||||
}
|
||||
|
||||
while (1)
|
||||
{
|
||||
DWORD status = WaitForMultipleObjects(nCount, events, FALSE, INFINITE);
|
||||
|
||||
if (status == WAIT_FAILED)
|
||||
{
|
||||
error = GetLastError();
|
||||
WLog_ERR(TAG, "WaitForMultipleObjects failed with error %" PRIu32 "", error);
|
||||
break;
|
||||
}
|
||||
|
||||
status = WaitForSingleObject(context->priv->StopEvent, 0);
|
||||
|
||||
if (status == WAIT_FAILED)
|
||||
{
|
||||
error = GetLastError();
|
||||
WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "", error);
|
||||
break;
|
||||
}
|
||||
|
||||
if (status == WAIT_OBJECT_0)
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
const size_t len = Stream_Capacity(s);
|
||||
if (len > UINT32_MAX)
|
||||
{
|
||||
error = ERROR_INTERNAL_ERROR;
|
||||
break;
|
||||
}
|
||||
if (WTSVirtualChannelRead(context->priv->ChannelHandle, 0, Stream_BufferAs(s, char),
|
||||
(UINT32)len, &BytesReturned))
|
||||
{
|
||||
if (BytesReturned)
|
||||
Stream_Seek(s, BytesReturned);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!Stream_EnsureRemainingCapacity(s, BytesReturned))
|
||||
{
|
||||
WLog_ERR(TAG, "Stream_EnsureRemainingCapacity failed!");
|
||||
error = CHANNEL_RC_NO_MEMORY;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (Stream_GetPosition(s) >= 8)
|
||||
{
|
||||
const UINT32* pHeader = Stream_BufferAs(s, UINT32);
|
||||
const UINT32 PduLength = pHeader[0] + pHeader[1] + 8;
|
||||
|
||||
if (PduLength >= Stream_GetPosition(s))
|
||||
{
|
||||
Stream_SealLength(s);
|
||||
Stream_ResetPosition(s);
|
||||
|
||||
error = remdesk_server_receive_pdu(context, s);
|
||||
if (error)
|
||||
{
|
||||
WLog_ERR(TAG, "remdesk_server_receive_pdu failed with error %" PRIu32 "!",
|
||||
error);
|
||||
break;
|
||||
}
|
||||
|
||||
Stream_ResetPosition(s);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
out:
|
||||
Stream_Free(s, TRUE);
|
||||
|
||||
if (error && context->rdpcontext)
|
||||
setChannelError(context->rdpcontext, error, "remdesk_server_thread reported an error");
|
||||
|
||||
ExitThread(error);
|
||||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* Function description
|
||||
*
|
||||
* @return 0 on success, otherwise a Win32 error code
|
||||
*/
|
||||
static UINT remdesk_server_start(RemdeskServerContext* context)
|
||||
{
|
||||
context->priv->ChannelHandle =
|
||||
WTSVirtualChannelOpen(context->vcm, WTS_CURRENT_SESSION, REMDESK_SVC_CHANNEL_NAME);
|
||||
|
||||
if (!context->priv->ChannelHandle)
|
||||
{
|
||||
WLog_ERR(TAG, "WTSVirtualChannelOpen failed!");
|
||||
return ERROR_INTERNAL_ERROR;
|
||||
}
|
||||
|
||||
if (!(context->priv->StopEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr)))
|
||||
{
|
||||
WLog_ERR(TAG, "CreateEvent failed!");
|
||||
return ERROR_INTERNAL_ERROR;
|
||||
}
|
||||
|
||||
if (!(context->priv->Thread =
|
||||
CreateThread(nullptr, 0, remdesk_server_thread, (void*)context, 0, nullptr)))
|
||||
{
|
||||
WLog_ERR(TAG, "CreateThread failed!");
|
||||
(void)CloseHandle(context->priv->StopEvent);
|
||||
context->priv->StopEvent = nullptr;
|
||||
return ERROR_INTERNAL_ERROR;
|
||||
}
|
||||
|
||||
return CHANNEL_RC_OK;
|
||||
}
|
||||
|
||||
/**
|
||||
* Function description
|
||||
*
|
||||
* @return 0 on success, otherwise a Win32 error code
|
||||
*/
|
||||
static UINT remdesk_server_stop(RemdeskServerContext* context)
|
||||
{
|
||||
UINT error = 0;
|
||||
(void)SetEvent(context->priv->StopEvent);
|
||||
|
||||
if (WaitForSingleObject(context->priv->Thread, INFINITE) == WAIT_FAILED)
|
||||
{
|
||||
error = GetLastError();
|
||||
WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
(void)CloseHandle(context->priv->Thread);
|
||||
(void)CloseHandle(context->priv->StopEvent);
|
||||
return CHANNEL_RC_OK;
|
||||
}
|
||||
|
||||
RemdeskServerContext* remdesk_server_context_new(HANDLE vcm)
|
||||
{
|
||||
RemdeskServerContext* context = nullptr;
|
||||
context = (RemdeskServerContext*)calloc(1, sizeof(RemdeskServerContext));
|
||||
|
||||
if (context)
|
||||
{
|
||||
context->vcm = vcm;
|
||||
context->Start = remdesk_server_start;
|
||||
context->Stop = remdesk_server_stop;
|
||||
context->priv = (RemdeskServerPrivate*)calloc(1, sizeof(RemdeskServerPrivate));
|
||||
|
||||
if (!context->priv)
|
||||
{
|
||||
free(context);
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
context->priv->Version = 1;
|
||||
}
|
||||
|
||||
return context;
|
||||
}
|
||||
|
||||
void remdesk_server_context_free(RemdeskServerContext* context)
|
||||
{
|
||||
if (context)
|
||||
{
|
||||
if (context->priv->ChannelHandle != INVALID_HANDLE_VALUE)
|
||||
(void)WTSVirtualChannelClose(context->priv->ChannelHandle);
|
||||
|
||||
free(context->priv);
|
||||
free(context);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user