1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
/**
* 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 = 0;
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;
}
|
