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Milestone 5: deliver embedded RDP sessions and lifecycle hardening

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This commit is contained in:
Keith Smith
2026-03-03 18:59:26 -07:00
parent 230a401386
commit 36006bd4aa
2941 changed files with 724359 additions and 77 deletions
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25
third_party/FreeRDP/channels/encomsp/server/CMakeLists.txt vendored Normal file
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# FreeRDP: A Remote Desktop Protocol Implementation
# FreeRDP cmake build script
#
# Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
#
# 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.
define_channel_server("encomsp")
include_directories(..)
set(${MODULE_PREFIX}_SRCS encomsp_main.c encomsp_main.h)
set(${MODULE_PREFIX}_LIBS winpr)
add_channel_server_library(${MODULE_PREFIX} ${MODULE_NAME} ${CHANNEL_NAME} FALSE "VirtualChannelEntry")

352
third_party/FreeRDP/channels/encomsp/server/encomsp_main.c vendored Normal file
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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Multiparty Virtual Channel
*
* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2015 Thincast Technologies GmbH
* Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
*
* 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.
*/
#include <freerdp/config.h>
#include <winpr/crt.h>
#include <winpr/print.h>
#include <winpr/stream.h>
#include <freerdp/freerdp.h>
#include <freerdp/channels/log.h>
#include "encomsp_main.h"
#define TAG CHANNELS_TAG("encomsp.server")
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT encomsp_read_header(wStream* s, ENCOMSP_ORDER_HEADER* header)
{
if (!Stream_CheckAndLogRequiredLength(TAG, s, ENCOMSP_ORDER_HEADER_SIZE))
return ERROR_INVALID_DATA;
Stream_Read_UINT16(s, header->Type); /* Type (2 bytes) */
Stream_Read_UINT16(s, header->Length); /* Length (2 bytes) */
return CHANNEL_RC_OK;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT encomsp_recv_change_participant_control_level_pdu(EncomspServerContext* context,
wStream* s,
const ENCOMSP_ORDER_HEADER* header)
{
ENCOMSP_CHANGE_PARTICIPANT_CONTROL_LEVEL_PDU pdu = WINPR_C_ARRAY_INIT;
UINT error = CHANNEL_RC_OK;
const size_t pos = Stream_GetPosition(s);
if (pos < ENCOMSP_ORDER_HEADER_SIZE)
return ERROR_INVALID_PARAMETER;
const size_t beg = pos - ENCOMSP_ORDER_HEADER_SIZE;
CopyMemory(&pdu, header, sizeof(ENCOMSP_ORDER_HEADER));
if (!Stream_CheckAndLogRequiredLength(TAG, s, 6))
return ERROR_INVALID_DATA;
Stream_Read_UINT16(s, pdu.Flags); /* Flags (2 bytes) */
Stream_Read_UINT32(s, pdu.ParticipantId); /* ParticipantId (4 bytes) */
const size_t end = Stream_GetPosition(s);
if ((beg + header->Length) < end)
{
WLog_ERR(TAG, "Not enough data!");
return ERROR_INVALID_DATA;
}
if ((beg + header->Length) > end)
{
if (!Stream_CheckAndLogRequiredLength(TAG, s, (size_t)((beg + header->Length) - end)))
return ERROR_INVALID_DATA;
Stream_SetPosition(s, (beg + header->Length));
}
IFCALLRET(context->ChangeParticipantControlLevel, error, context, &pdu);
if (error)
WLog_ERR(TAG, "context->ChangeParticipantControlLevel failed with error %" PRIu32 "",
error);
return error;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT encomsp_server_receive_pdu(EncomspServerContext* context, wStream* s)
{
UINT error = CHANNEL_RC_OK;
while (Stream_GetRemainingLength(s) > 0)
{
ENCOMSP_ORDER_HEADER header = WINPR_C_ARRAY_INIT;
if ((error = encomsp_read_header(s, &header)))
{
WLog_ERR(TAG, "encomsp_read_header failed with error %" PRIu32 "!", error);
return error;
}
WLog_INFO(TAG, "EncomspReceive: Type: %" PRIu16 " Length: %" PRIu16 "", header.Type,
header.Length);
switch (header.Type)
{
case ODTYPE_PARTICIPANT_CTRL_CHANGED:
if ((error =
encomsp_recv_change_participant_control_level_pdu(context, s, &header)))
{
WLog_ERR(TAG,
"encomsp_recv_change_participant_control_level_pdu failed with error "
"%" PRIu32 "!",
error);
return error;
}
break;
default:
WLog_ERR(TAG, "header.Type unknown %" PRIu16 "!", header.Type);
return ERROR_INVALID_DATA;
}
}
return error;
}
static DWORD WINAPI encomsp_server_thread(LPVOID arg)
{
wStream* s = nullptr;
DWORD nCount = 0;
void* buffer = nullptr;
HANDLE events[8];
HANDLE ChannelEvent = nullptr;
DWORD BytesReturned = 0;
ENCOMSP_ORDER_HEADER* header = nullptr;
EncomspServerContext* context = nullptr;
UINT error = CHANNEL_RC_OK;
DWORD status = 0;
context = (EncomspServerContext*)arg;
buffer = nullptr;
BytesReturned = 0;
ChannelEvent = nullptr;
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);
}
nCount = 0;
events[nCount++] = ChannelEvent;
events[nCount++] = context->priv->StopEvent;
while (1)
{
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;
}
if (!WTSVirtualChannelRead(context->priv->ChannelHandle, 0, nullptr, 0, &BytesReturned))
{
WLog_ERR(TAG, "WTSVirtualChannelRead failed!");
error = ERROR_INTERNAL_ERROR;
break;
}
if (BytesReturned < 1)
continue;
if (!Stream_EnsureRemainingCapacity(s, BytesReturned))
{
WLog_ERR(TAG, "Stream_EnsureRemainingCapacity failed!");
error = CHANNEL_RC_NO_MEMORY;
break;
}
const size_t cap = Stream_Capacity(s);
if ((cap > UINT32_MAX) ||
!WTSVirtualChannelRead(context->priv->ChannelHandle, 0, Stream_BufferAs(s, char),
(ULONG)cap, &BytesReturned))
{
WLog_ERR(TAG, "WTSVirtualChannelRead failed!");
error = ERROR_INTERNAL_ERROR;
break;
}
if (Stream_GetPosition(s) >= ENCOMSP_ORDER_HEADER_SIZE)
{
header = Stream_BufferAs(s, ENCOMSP_ORDER_HEADER);
if (header->Length >= Stream_GetPosition(s))
{
Stream_SealLength(s);
Stream_ResetPosition(s);
if ((error = encomsp_server_receive_pdu(context, s)))
{
WLog_ERR(TAG, "encomsp_server_receive_pdu failed with error %" PRIu32 "!",
error);
break;
}
Stream_ResetPosition(s);
}
}
}
Stream_Free(s, TRUE);
out:
if (error && context->rdpcontext)
setChannelError(context->rdpcontext, error, "encomsp_server_thread reported an error");
ExitThread(error);
return error;
}
/**
* Function description
*
* @return 0 on success, otherwise a Win32 error code
*/
static UINT encomsp_server_start(EncomspServerContext* context)
{
context->priv->ChannelHandle =
WTSVirtualChannelOpen(context->vcm, WTS_CURRENT_SESSION, ENCOMSP_SVC_CHANNEL_NAME);
if (!context->priv->ChannelHandle)
return CHANNEL_RC_BAD_CHANNEL;
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, encomsp_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 encomsp_server_stop(EncomspServerContext* context)
{
UINT error = CHANNEL_RC_OK;
(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 error;
}
EncomspServerContext* encomsp_server_context_new(HANDLE vcm)
{
EncomspServerContext* context = nullptr;
context = (EncomspServerContext*)calloc(1, sizeof(EncomspServerContext));
if (context)
{
context->vcm = vcm;
context->Start = encomsp_server_start;
context->Stop = encomsp_server_stop;
context->priv = (EncomspServerPrivate*)calloc(1, sizeof(EncomspServerPrivate));
if (!context->priv)
{
WLog_ERR(TAG, "calloc failed!");
free(context);
return nullptr;
}
}
return context;
}
void encomsp_server_context_free(EncomspServerContext* context)
{
if (context)
{
if (context->priv->ChannelHandle != INVALID_HANDLE_VALUE)
(void)WTSVirtualChannelClose(context->priv->ChannelHandle);
free(context->priv);
free(context);
}
}

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third_party/FreeRDP/channels/encomsp/server/encomsp_main.h vendored Normal file
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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Multiparty Virtual Channel
*
* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* 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.
*/
#ifndef FREERDP_CHANNEL_ENCOMSP_SERVER_MAIN_H
#define FREERDP_CHANNEL_ENCOMSP_SERVER_MAIN_H
#include <winpr/crt.h>
#include <winpr/synch.h>
#include <winpr/thread.h>
#include <freerdp/server/encomsp.h>
struct s_encomsp_server_private
{
HANDLE Thread;
HANDLE StopEvent;
void* ChannelHandle;
};
#endif /* FREERDP_CHANNEL_ENCOMSP_SERVER_MAIN_H */