Files
xrdp/sesman/chansrv/clipboard_file.c
T
Koichiro IWAO ad13956b12 clipboard file: Implement MS-RDPECLIP 3.1.5.4.7 compliance
If the requested file data could not be retrieved or the sender received
an unsuccessful Format List Response PDU (section 3.1.5.2.4), then the
clipHeader field MUST contain the CB_RESPONSE_FAIL (0x0002) flag and the
requestedFileContentsData field MUST contain no data (zero-length).

https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpeclip/5d3991e9-440d-4e4d-8b8d-391c324c4007

Fixes #1997.
2021-09-21 16:50:42 +09:00

714 lines
21 KiB
C

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2012
*
* 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.
*/
/* MS-RDPECLIP
* http://msdn.microsoft.com/en-us/library/cc241066%28prot.20%29.aspx
*
* CLIPRDR_FILEDESCRIPTOR
* http://msdn.microsoft.com/en-us/library/ff362447%28prot.20%29.aspx */
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <sys/time.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xfixes.h>
#include "arch.h"
#include "parse.h"
#include "os_calls.h"
#include "string_calls.h"
#include "list.h"
#include "chansrv.h"
#include "clipboard.h"
#include "clipboard_file.h"
#include "clipboard_common.h"
#include "xcommon.h"
#include "chansrv_fuse.h"
#include "ms-rdpeclip.h"
extern int g_cliprdr_chan_id; /* in chansrv.c */
extern struct clip_s2c g_clip_s2c; /* in clipboard.c */
extern struct clip_c2s g_clip_c2s; /* in clipboard.c */
extern char g_fuse_clipboard_path[];
struct cb_file_info
{
char pathname[256];
char filename[256];
int flags;
int size;
tui64 time;
};
static struct list *g_files_list = 0;
/* used when server is asking for file info from the client */
static int g_file_request_sent_type = 0;
/* number of seconds from 1 Jan. 1601 00:00 to 1 Jan 1970 00:00 UTC */
#define CB_EPOCH_DIFF 11644473600LL
/*****************************************************************************/
#if 0
static tui64
timeval2wintime(struct timeval *tv)
{
tui64 result;
result = CB_EPOCH_DIFF;
result += tv->tv_sec;
result *= 10000000LL;
result += tv->tv_usec * 10;
return result;
}
#endif
/***
* See MS-RDPECLIP 3.1.5.4.7
*
* Sends a failure response to a CLIPRDR_FILECONTENTS_REQUEST
* @param streamId Stream ID from CLIPRDR_FILECONTENTS_REQUEST
* @return 0 for success
*/
static int
clipboard_send_filecontents_response_fail(int streamId)
{
LOG_DEVEL(LOG_LEVEL_TRACE, "clipboardn_send_filecontents_response_fail:");
struct stream *s;
int size;
int rv;
make_stream(s);
init_stream(s, 64);
out_uint16_le(s, CB_FILECONTENTS_RESPONSE);
out_uint16_le(s, CB_RESPONSE_FAIL);
out_uint32_le(s, 4);
out_uint32_le(s, streamId);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
return rv;
}
/*****************************************************************************/
/* this will replace %20 or any hex with the space or correct char
* returns error */
static int
clipboard_check_file(char *filename)
{
char lfilename[256];
char jchr[8];
int lindex;
int index;
g_memset(lfilename, 0, 256);
lindex = 0;
index = 0;
while (filename[index] != 0)
{
if (filename[index] == '%')
{
jchr[0] = filename[index + 1];
jchr[1] = filename[index + 2];
jchr[2] = 0;
index += 3;
lfilename[lindex] = g_htoi(jchr);
lindex++;
}
else
{
lfilename[lindex] = filename[index];
lindex++;
index++;
}
}
LOG_DEVEL(LOG_LEVEL_DEBUG, "[%s] [%s]", filename, lfilename);
g_strcpy(filename, lfilename);
return 0;
}
/*****************************************************************************/
static int
clipboard_get_file(const char *file, int bytes)
{
int sindex;
int pindex;
int flags;
char full_fn[256]; /* /etc/xrdp/xrdp.ini */
char filename[256]; /* xrdp.ini */
char pathname[256]; /* /etc/xrdp */
struct cb_file_info *cfi;
/* x-special/gnome-copied-files */
if ((g_strncmp(file, "copy", 4) == 0) && (bytes == 4))
{
return 0;
}
if ((g_strncmp(file, "cut", 3) == 0) && (bytes == 3))
{
return 0;
}
sindex = 0;
flags = CB_FILE_ATTRIBUTE_ARCHIVE;
/* text/uri-list */
/* x-special/gnome-copied-files */
if (g_strncmp(file, "file://", 7) == 0)
{
sindex = 7;
}
pindex = bytes;
while (pindex > sindex)
{
if (file[pindex] == '/')
{
break;
}
pindex--;
}
g_memset(pathname, 0, 256);
g_memset(filename, 0, 256);
g_memcpy(pathname, file + sindex, pindex - sindex);
if (pathname[0] == 0)
{
pathname[0] = '/';
}
g_memcpy(filename, file + pindex + 1, (bytes - 1) - pindex);
/* this should replace %20 with space */
clipboard_check_file(pathname);
clipboard_check_file(filename);
g_snprintf(full_fn, 255, "%s/%s", pathname, filename);
if (g_directory_exist(full_fn))
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_get_file: file [%s] is a directory, "
"not supported", full_fn);
flags |= CB_FILE_ATTRIBUTE_DIRECTORY;
return 1;
}
if (!g_file_exist(full_fn))
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_get_file: file [%s] does not exist",
full_fn);
return 1;
}
else
{
cfi = (struct cb_file_info *)g_malloc(sizeof(struct cb_file_info), 1);
list_add_item(g_files_list, (tintptr)cfi);
g_strcpy(cfi->filename, filename);
g_strcpy(cfi->pathname, pathname);
cfi->size = g_file_get_size(full_fn);
cfi->flags = flags;
cfi->time = (g_time1() + CB_EPOCH_DIFF) * 10000000LL;
LOG_DEVEL(LOG_LEVEL_DEBUG, "ok filename [%s] pathname [%s] size [%d]",
cfi->filename, cfi->pathname, cfi->size);
}
return 0;
}
/*****************************************************************************/
static int
clipboard_get_files(const char *files, int bytes)
{
int index;
int file_index;
char file[512];
file_index = 0;
for (index = 0; index < bytes; index++)
{
if (files[index] == '\n' || files[index] == '\r')
{
if (file_index > 0)
{
if (clipboard_get_file(file, file_index) == 0)
{
}
file_index = 0;
}
}
else
{
file[file_index] = files[index];
file_index++;
}
}
if (file_index > 0)
{
if (clipboard_get_file(file, file_index) == 0)
{
}
}
if (g_files_list->count < 1)
{
return 1;
}
return 0;
}
/*****************************************************************************/
/* server to client */
/* response to client asking for clipboard contents that is file list */
int
clipboard_send_data_response_for_file(const char *data, int data_size)
{
struct stream *s;
int size;
int rv;
int bytes_after_header;
int cItems;
int flags;
int index;
tui32 ui32;
char fn[256];
struct cb_file_info *cfi;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_send_data_response_for_file: data_size %d",
data_size);
LOG_DEVEL_HEXDUMP(LOG_LEVEL_TRACE, "", data, data_size);
if (g_files_list == 0)
{
g_files_list = list_create();
g_files_list->auto_free = 1;
}
list_clear(g_files_list);
clipboard_get_files(data, data_size);
cItems = g_files_list->count;
bytes_after_header = cItems * 592 + 4;
make_stream(s);
init_stream(s, 64 + bytes_after_header);
out_uint16_le(s, CB_FORMAT_DATA_RESPONSE); /* 5 CLIPRDR_DATA_RESPONSE */
out_uint16_le(s, CB_RESPONSE_OK); /* 1 status */
out_uint32_le(s, bytes_after_header);
out_uint32_le(s, cItems);
for (index = 0; index < cItems; index++)
{
cfi = (struct cb_file_info *)list_get_item(g_files_list, index);
flags = CB_FD_ATTRIBUTES | CB_FD_FILESIZE | CB_FD_WRITESTIME | CB_FD_PROGRESSUI;
out_uint32_le(s, flags);
out_uint8s(s, 32); /* reserved1 */
flags = cfi->flags;
out_uint32_le(s, flags);
out_uint8s(s, 16); /* reserved2 */
/* file time */
/* 100-nanoseconds intervals since 1 January 1601 */
//out_uint32_le(s, 0x2c305d08); /* 25 October 2009, 21:17 */
//out_uint32_le(s, 0x01ca55f3);
ui32 = cfi->time & 0xffffffff;
out_uint32_le(s, ui32);
ui32 = cfi->time >> 32;
out_uint32_le(s, ui32);
/* file size */
out_uint32_le(s, 0);
out_uint32_le(s, cfi->size);
g_snprintf(fn, 255, "%s", cfi->filename);
clipboard_out_unicode(s, fn, 256);
out_uint8s(s, 8); /* pad */
}
out_uint32_le(s, 0);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
return rv;
}
/*****************************************************************************/
/* send the file size from server to the client */
static int
clipboard_send_file_size(int streamId, int lindex)
{
struct stream *s;
int size;
int rv;
int file_size;
struct cb_file_info *cfi;
if (g_files_list == 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_size: error g_files_list is nil");
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
cfi = (struct cb_file_info *)list_get_item(g_files_list, lindex);
if (cfi == 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_size: error cfi is nil");
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
if (cfi->size < 0)
{
LOG(LOG_LEVEL_ERROR, "clipboard_send_file_size: failed to get file size");
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
file_size = cfi->size;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_send_file_size: streamId %d file_size %d",
streamId, file_size);
make_stream(s);
init_stream(s, 8192);
out_uint16_le(s, CB_FILECONTENTS_RESPONSE); /* 9 */
out_uint16_le(s, CB_RESPONSE_OK); /* 1 status */
out_uint32_le(s, 12);
out_uint32_le(s, streamId);
out_uint32_le(s, file_size);
out_uint32_le(s, 0);
out_uint32_le(s, 0);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
return rv;
}
/*****************************************************************************/
/* ask the client to send the file size */
int
clipboard_request_file_size(int stream_id, int lindex)
{
struct stream *s;
int size;
int rv;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_request_file_size:");
if (g_file_request_sent_type != 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_request_file_size: warning, still waiting "
"for CB_FILECONTENTS_RESPONSE");
}
make_stream(s);
init_stream(s, 8192);
out_uint16_le(s, CB_FILECONTENTS_REQUEST); /* 8 */
out_uint16_le(s, 0);
out_uint32_le(s, 28);
out_uint32_le(s, stream_id);
out_uint32_le(s, lindex);
out_uint32_le(s, CB_FILECONTENTS_SIZE);
out_uint32_le(s, 0); /* nPositionLow */
out_uint32_le(s, 0); /* nPositionHigh */
out_uint32_le(s, 0); /* cbRequested */
out_uint32_le(s, 0); /* clipDataId */
out_uint32_le(s, 0);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
g_file_request_sent_type = CB_FILECONTENTS_SIZE;
return rv;
}
/*****************************************************************************/
/* send a chunk of the file from server to client */
static int
clipboard_send_file_data(int streamId, int lindex,
int nPositionLow, int cbRequested)
{
struct stream *s;
int size;
int rv;
int fd;
char full_fn[256];
struct cb_file_info *cfi;
if (g_files_list == 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_data: error g_files_list is nil");
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
cfi = (struct cb_file_info *)list_get_item(g_files_list, lindex);
if (cfi == 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_data: error cfi is nil");
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_send_file_data: streamId %d lindex %d "
"nPositionLow %d cbRequested %d", streamId, lindex,
nPositionLow, cbRequested);
g_snprintf(full_fn, 255, "%s/%s", cfi->pathname, cfi->filename);
fd = g_file_open_ex(full_fn, 1, 0, 0, 0);
if (fd == -1)
{
LOG(LOG_LEVEL_ERROR, "clipboard_send_file_data: file open [%s] failed: %s",
full_fn, g_get_strerror());
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
if (g_file_seek(fd, nPositionLow) < 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_data: seek error "
"in file: %s", full_fn);
g_file_close(fd);
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
make_stream(s);
init_stream(s, cbRequested + 64);
size = g_file_read(fd, s->data + 12, cbRequested);
if (size < 1)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_send_file_data: read error, want %d got %d",
cbRequested, size);
free_stream(s);
g_file_close(fd);
clipboard_send_filecontents_response_fail(streamId);
return 1;
}
out_uint16_le(s, CB_FILECONTENTS_RESPONSE); /* 9 */
out_uint16_le(s, CB_RESPONSE_OK); /* 1 status */
out_uint32_le(s, size + 4);
out_uint32_le(s, streamId);
s->p += size;
out_uint32_le(s, 0);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
g_file_close(fd);
/* Log who transferred which file via clipboard for the purpose of audit */
LOG(LOG_LEVEL_INFO, "S2C: Transfered a file: filename=%s, uid=%d", full_fn, g_getuid());
return rv;
}
/*****************************************************************************/
/* ask the client to send the file size */
int
clipboard_request_file_data(int stream_id, int lindex, int offset,
int request_bytes)
{
struct stream *s;
int size;
int rv;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_request_file_data: stream_id=%d lindex=%d off=%d request_bytes=%d",
stream_id, lindex, offset, request_bytes);
if (g_file_request_sent_type != 0)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_request_file_data: warning, still waiting "
"for CB_FILECONTENTS_RESPONSE");
}
make_stream(s);
init_stream(s, 8192);
out_uint16_le(s, CB_FILECONTENTS_REQUEST); /* 8 */
out_uint16_le(s, 0);
out_uint32_le(s, 28);
out_uint32_le(s, stream_id);
out_uint32_le(s, lindex);
out_uint32_le(s, CB_FILECONTENTS_RANGE);
out_uint32_le(s, offset); /* nPositionLow */
out_uint32_le(s, 0); /* nPositionHigh */
out_uint32_le(s, request_bytes); /* cbRequested */
out_uint32_le(s, 0); /* clipDataId */
out_uint32_le(s, 0);
s_mark_end(s);
size = (int)(s->end - s->data);
rv = send_channel_data(g_cliprdr_chan_id, s->data, size);
free_stream(s);
g_file_request_sent_type = CB_FILECONTENTS_RANGE;
return rv;
}
/*****************************************************************************/
/* client is asking from info about a file */
int
clipboard_process_file_request(struct stream *s, int clip_msg_status,
int clip_msg_len)
{
int streamId;
int lindex;
int dwFlags;
int nPositionLow;
int cbRequested;
//int clipDataId;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_process_file_request:");
LOG_DEVEL_HEXDUMP(LOG_LEVEL_TRACE, "", s->p, clip_msg_len);
in_uint32_le(s, streamId);
in_uint32_le(s, lindex);
in_uint32_le(s, dwFlags);
in_uint32_le(s, nPositionLow);
in_uint8s(s, 4); /* nPositionHigh */
in_uint32_le(s, cbRequested);
//in_uint32_le(s, clipDataId); /* options, used when locking */
if (dwFlags & CB_FILECONTENTS_SIZE)
{
clipboard_send_file_size(streamId, lindex);
}
if (dwFlags & CB_FILECONTENTS_RANGE)
{
clipboard_send_file_data(streamId, lindex, nPositionLow, cbRequested);
}
return 0;
}
/*****************************************************************************/
/* server requested info about the file and this is the response
it's either the file size or file data */
int
clipboard_process_file_response(struct stream *s, int clip_msg_status,
int clip_msg_len)
{
int streamId;
int file_size;
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_process_file_response:");
if (g_file_request_sent_type == CB_FILECONTENTS_SIZE)
{
g_file_request_sent_type = 0;
in_uint32_le(s, streamId);
in_uint32_le(s, file_size);
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_process_file_response: streamId %d "
"file_size %d", streamId, file_size);
xfuse_file_contents_size(streamId, file_size);
}
else if (g_file_request_sent_type == CB_FILECONTENTS_RANGE)
{
g_file_request_sent_type = 0;
in_uint32_le(s, streamId);
xfuse_file_contents_range(streamId, s->p, clip_msg_len - 4);
}
else
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_process_file_response: error");
g_file_request_sent_type = 0;
}
return 0;
}
/*****************************************************************************/
/* read in CLIPRDR_FILEDESCRIPTOR [MS-RDPECLIP] 2.2.5.2.3.1 */
static int
clipboard_c2s_in_file_info(struct stream *s, struct clip_file_desc *cfd)
{
int num_chars;
int filename_bytes;
int ex_bytes;
if (!s_check_rem_and_log(s, 4 + 32 + 4 + 16 + 8 + 8 + 520,
"Parsing [MS-RDPECLIP] CLIPRDR_FILEDESCRIPTOR"))
{
return 1;
}
in_uint32_le(s, cfd->flags);
in_uint8s(s, 32); /* reserved1 */
in_uint32_le(s, cfd->fileAttributes);
in_uint8s(s, 16); /* reserved2 */
in_uint32_le(s, cfd->lastWriteTimeLow);
in_uint32_le(s, cfd->lastWriteTimeHigh);
in_uint32_le(s, cfd->fileSizeHigh);
in_uint32_le(s, cfd->fileSizeLow);
num_chars = sizeof(cfd->cFileName);
filename_bytes = clipboard_in_unicode(s, cfd->cFileName, &num_chars);
ex_bytes = 520 - filename_bytes;
in_uint8s(s, ex_bytes);
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_c2s_in_file_info:");
LOG_DEVEL(LOG_LEVEL_DEBUG, " flags 0x%8.8x", cfd->flags);
LOG_DEVEL(LOG_LEVEL_DEBUG, " fileAttributes 0x%8.8x", cfd->fileAttributes);
LOG_DEVEL(LOG_LEVEL_DEBUG, " lastWriteTime 0x%8.8x%8.8x", cfd->lastWriteTimeHigh,
cfd->lastWriteTimeLow);
LOG_DEVEL(LOG_LEVEL_DEBUG, " fileSize 0x%8.8x%8.8x", cfd->fileSizeHigh,
cfd->fileSizeLow);
LOG_DEVEL(LOG_LEVEL_DEBUG, " num_chars %d cFileName [%s]", num_chars, cfd->cFileName);
return 0;
}
/*****************************************************************************/
/* See [MS-RDPECLIP] 2.2.5.2.3 */
int
clipboard_c2s_in_files(struct stream *s, char *file_list)
{
int cItems;
int lindex;
int str_len;
int file_count;
struct clip_file_desc cfd;
char *ptr;
if (!s_check_rem(s, 4))
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_c2s_in_files: parse error");
return 1;
}
in_uint32_le(s, cItems);
if (cItems > 64 * 1024) /* sanity check */
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_c2s_in_files: error cItems %d too big", cItems);
return 1;
}
xfuse_clear_clip_dir();
LOG_DEVEL(LOG_LEVEL_DEBUG, "clipboard_c2s_in_files: cItems %d", cItems);
file_count = 0;
ptr = file_list;
for (lindex = 0; lindex < cItems; lindex++)
{
g_memset(&cfd, 0, sizeof(struct clip_file_desc));
if (clipboard_c2s_in_file_info(s, &cfd) != 0)
{
return 1;
}
if ((g_pos(cfd.cFileName, "\\") >= 0) ||
(cfd.fileAttributes & CB_FILE_ATTRIBUTE_DIRECTORY))
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_c2s_in_files: skipping directory not "
"supported [%s]", cfd.cFileName);
continue;
}
if (xfuse_add_clip_dir_item(cfd.cFileName, 0, cfd.fileSizeLow, lindex) == -1)
{
LOG_DEVEL(LOG_LEVEL_ERROR, "clipboard_c2s_in_files: failed to add clip dir item");
continue;
}
if (file_count > 0)
{
*ptr = '\n';
ptr++;
}
file_count++;
g_strcpy(ptr, "file://");
ptr += 7;
str_len = g_strlen(g_fuse_clipboard_path);
g_strcpy(ptr, g_fuse_clipboard_path);
ptr += str_len;
*ptr = '/';
ptr++;
str_len = g_strlen(cfd.cFileName);
g_strcpy(ptr, cfd.cFileName);
ptr += str_len;
}
*ptr = 0;
return 0;
}