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FreeRDP/libfreerdp/utils/cliprdr_utils.c
Armin Novak fb60145685 [utils,cliprdr] remove runtime assert
2023-03-05 17:55:28 +01:00

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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Clipboard Virtual Channel Extension
*
* Copyright 2013 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2022 Armin Novak <anovak@thincast.com
* Copyright 2022 Thincast Technologies GmbH
*
* 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 <winpr/stream.h>
#include <freerdp/utils/cliprdr_utils.h>
#include <freerdp/channels/cliprdr.h>
#include <freerdp/log.h>
#define TAG FREERDP_TAG("utils." CLIPRDR_SVC_CHANNEL_NAME)
#define CLIPRDR_FILEDESCRIPTOR_SIZE (4 + 32 + 4 + 16 + 8 + 8 + 520)
#define CLIPRDR_MAX_FILE_SIZE (2U * 1024 * 1024 * 1024)
static UINT64 filetime_to_uint64(FILETIME value)
{
UINT64 converted = 0;
converted |= (UINT32)value.dwHighDateTime;
converted <<= 32;
converted |= (UINT32)value.dwLowDateTime;
return converted;
}
static FILETIME uint64_to_filetime(UINT64 value)
{
FILETIME converted;
converted.dwLowDateTime = (UINT32)(value >> 0);
converted.dwHighDateTime = (UINT32)(value >> 32);
return converted;
}
/**
* Parse a packed file list.
*
* The resulting array must be freed with the `free()` function.
*
* @param [in] format_data packed `CLIPRDR_FILELIST` to parse.
* @param [in] format_data_length length of `format_data` in bytes.
* @param [out] file_descriptor_array parsed array of `FILEDESCRIPTOR` structs.
* @param [out] file_descriptor_count number of elements in `file_descriptor_array`.
*
* @returns 0 on success, otherwise a Win32 error code.
*/
UINT cliprdr_parse_file_list(const BYTE* format_data, UINT32 format_data_length,
FILEDESCRIPTORW** file_descriptor_array, UINT32* file_descriptor_count)
{
UINT result = NO_ERROR;
UINT32 count = 0;
wStream sbuffer;
wStream* s = NULL;
if (!format_data || !file_descriptor_array || !file_descriptor_count)
return ERROR_BAD_ARGUMENTS;
s = Stream_StaticConstInit(&sbuffer, format_data, format_data_length);
if (!s)
return ERROR_NOT_ENOUGH_MEMORY;
if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
{
result = ERROR_INCORRECT_SIZE;
goto out;
}
Stream_Read_UINT32(s, count); /* cItems (4 bytes) */
if (!Stream_CheckAndLogRequiredLengthOfSize(TAG, s, count, CLIPRDR_FILEDESCRIPTOR_SIZE))
{
result = ERROR_INCORRECT_SIZE;
goto out;
}
*file_descriptor_count = count;
*file_descriptor_array = calloc(count, sizeof(FILEDESCRIPTORW));
if (!*file_descriptor_array)
{
result = ERROR_NOT_ENOUGH_MEMORY;
goto out;
}
for (UINT32 i = 0; i < count; i++)
{
FILEDESCRIPTORW* file = &((*file_descriptor_array)[i]);
if (!cliprdr_read_filedescriptor(s, file))
goto out;
}
if (Stream_GetRemainingLength(s) > 0)
WLog_WARN(TAG, "packed file list has %" PRIuz " excess bytes",
Stream_GetRemainingLength(s));
out:
return result;
}
BOOL cliprdr_read_filedescriptor(wStream* s, FILEDESCRIPTORW* file)
{
UINT64 tmp = 0;
WINPR_ASSERT(file);
if (!Stream_CheckAndLogRequiredLength(TAG, s, sizeof(FILEDESCRIPTORW)))
return FALSE;
Stream_Read_UINT32(s, file->dwFlags); /* flags (4 bytes) */
Stream_Read_UINT32(s, file->clsid.Data1);
Stream_Read_UINT16(s, file->clsid.Data2);
Stream_Read_UINT16(s, file->clsid.Data3);
Stream_Read(s, &file->clsid.Data4, sizeof(file->clsid.Data4));
Stream_Read_INT32(s, file->sizel.cx);
Stream_Read_INT32(s, file->sizel.cy);
Stream_Read_INT32(s, file->pointl.x);
Stream_Read_INT32(s, file->pointl.y);
Stream_Read_UINT32(s, file->dwFileAttributes); /* fileAttributes (4 bytes) */
Stream_Read_UINT64(s, tmp); /* ftCreationTime (8 bytes) */
file->ftCreationTime = uint64_to_filetime(tmp);
Stream_Read_UINT64(s, tmp); /* ftLastAccessTime (8 bytes) */
file->ftLastAccessTime = uint64_to_filetime(tmp);
Stream_Read_UINT64(s, tmp); /* lastWriteTime (8 bytes) */
file->ftLastWriteTime = uint64_to_filetime(tmp);
Stream_Read_UINT32(s, file->nFileSizeHigh); /* fileSizeHigh (4 bytes) */
Stream_Read_UINT32(s, file->nFileSizeLow); /* fileSizeLow (4 bytes) */
Stream_Read_UTF16_String(s, file->cFileName,
ARRAYSIZE(file->cFileName)); /* cFileName (520 bytes) */
return TRUE;
}
BOOL cliprdr_write_filedescriptor(wStream* s, const FILEDESCRIPTORW* file)
{
WINPR_ASSERT(file);
if (!Stream_EnsureRemainingCapacity(s, sizeof(FILEDESCRIPTORW)))
return FALSE;
Stream_Write_UINT32(s, file->dwFlags); /* flags (4 bytes) */
Stream_Write_UINT32(s, file->clsid.Data1);
Stream_Write_UINT16(s, file->clsid.Data2);
Stream_Write_UINT16(s, file->clsid.Data3);
Stream_Write(s, &file->clsid.Data4, sizeof(file->clsid.Data4));
Stream_Write_INT32(s, file->sizel.cx);
Stream_Write_INT32(s, file->sizel.cy);
Stream_Write_INT32(s, file->pointl.x);
Stream_Write_INT32(s, file->pointl.y);
Stream_Write_UINT32(s, file->dwFileAttributes); /* fileAttributes (4 bytes) */
Stream_Write_UINT64(s, filetime_to_uint64(file->ftCreationTime));
Stream_Write_UINT64(s, filetime_to_uint64(file->ftLastAccessTime));
Stream_Write_UINT64(s, filetime_to_uint64(file->ftLastWriteTime)); /* lastWriteTime (8 bytes) */
Stream_Write_UINT32(s, file->nFileSizeHigh); /* fileSizeHigh (4 bytes) */
Stream_Write_UINT32(s, file->nFileSizeLow); /* fileSizeLow (4 bytes) */
Stream_Write_UTF16_String(s, file->cFileName,
ARRAYSIZE(file->cFileName)); /* cFileName (520 bytes) */
return TRUE;
}
/**
* Serialize a packed file list.
*
* The resulting format data must be freed with the `free()` function.
*
* @param [in] file_descriptor_array array of `FILEDESCRIPTOR` structs to serialize.
* @param [in] file_descriptor_count number of elements in `file_descriptor_array`.
* @param [out] format_data serialized CLIPRDR_FILELIST.
* @param [out] format_data_length length of `format_data` in bytes.
*
* @returns 0 on success, otherwise a Win32 error code.
*/
UINT cliprdr_serialize_file_list(const FILEDESCRIPTORW* file_descriptor_array,
UINT32 file_descriptor_count, BYTE** format_data,
UINT32* format_data_length)
{
return cliprdr_serialize_file_list_ex(CB_STREAM_FILECLIP_ENABLED, file_descriptor_array,
file_descriptor_count, format_data, format_data_length);
}
UINT cliprdr_serialize_file_list_ex(UINT32 flags, const FILEDESCRIPTORW* file_descriptor_array,
UINT32 file_descriptor_count, BYTE** format_data,
UINT32* format_data_length)
{
UINT result = NO_ERROR;
size_t len;
wStream* s = NULL;
if (!file_descriptor_array || !format_data || !format_data_length)
return ERROR_BAD_ARGUMENTS;
if ((flags & CB_STREAM_FILECLIP_ENABLED) == 0)
{
WLog_WARN(TAG, "No file clipboard support annouonced!");
return ERROR_BAD_ARGUMENTS;
}
s = Stream_New(NULL, 4 + file_descriptor_count * CLIPRDR_FILEDESCRIPTOR_SIZE);
if (!s)
return ERROR_NOT_ENOUGH_MEMORY;
Stream_Write_UINT32(s, file_descriptor_count); /* cItems (4 bytes) */
for (UINT32 i = 0; i < file_descriptor_count; i++)
{
const FILEDESCRIPTORW* file = &file_descriptor_array[i];
/*
* There is a known issue with Windows server getting stuck in
* an infinite loop when downloading files that are larger than
* 2 gigabytes. Do not allow clients to send such file lists.
*
* https://support.microsoft.com/en-us/help/2258090
*/
if ((flags & CB_HUGE_FILE_SUPPORT_ENABLED) == 0)
{
if ((file->nFileSizeHigh > 0) || (file->nFileSizeLow >= CLIPRDR_MAX_FILE_SIZE))
{
WLog_ERR(TAG, "cliprdr does not support files over 2 GB");
result = ERROR_FILE_TOO_LARGE;
goto error;
}
}
if (!cliprdr_write_filedescriptor(s, file))
goto error;
}
Stream_SealLength(s);
Stream_GetBuffer(s, *format_data);
Stream_GetLength(s, len);
if (len > UINT32_MAX)
goto error;
*format_data_length = (UINT32)len;
Stream_Free(s, FALSE);
return result;
error:
Stream_Free(s, TRUE);
return result;
}
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