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imgextractor.py
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imgextractor.py
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import os
import re
import struct
import ext4
if os.name == 'nt':
from ctypes.wintypes import LPCSTR, DWORD
from stat import FILE_ATTRIBUTE_SYSTEM
from ctypes import windll
from timeit import default_timer as dti
from utils import simg2img
class Extractor:
def __init__(self):
self.CONFING_DIR = None
self.DIR = None
self.FileName = ""
self.OUTPUT_IMAGE_FILE = ""
self.EXTRACT_DIR = ""
self.context = []
self.fs_config = []
@staticmethod
def __out_name(file_path, out=1):
name = file_path if out == 1 else os.path.basename(file_path).rsplit('.', 1)[0]
return name.split('-')[0].split(' ')[0].split('+')[0].split('{')[0].split('(')[0]
@staticmethod
def __append(msg, log):
if not os.path.isfile(log) and not os.path.exists(log):
open(log, 'tw', encoding='utf-8').close()
with open(log, 'a', newline='\n') as file:
print(msg, file=file)
@staticmethod
def __get_perm(arg):
if len(arg) < 9 or len(arg) > 10:
return
if len(arg) > 8:
arg = arg[1:]
o = s = w = g = 0
perms = {
'r': 4,
'w': 2,
'x': 1
}
for n, sym in enumerate(arg):
if n == 0 and perms.get(sym):
o = perms.get(sym)
elif n == 1 and perms.get(sym):
o += perms.get(sym)
elif n == 2:
if sym == 'S':
s = 4
elif perms.get(sym):
o += perms.get(sym)
elif sym == 's':
s += 4
o += 1
elif n == 3 and perms.get(sym):
g = perms.get(sym)
elif n == 4 and perms.get(sym):
g += perms.get(sym)
if n == 5:
if perms.get(sym):
g += perms.get(sym)
elif sym == 'S':
s += 2
elif sym == 's':
s += 2
g += 1
elif n == 6 and perms.get(sym):
w = perms.get(sym)
elif n == 7 and perms.get(sym):
w += perms.get(sym)
elif n == 8:
if perms.get(sym):
w += perms.get(sym)
elif sym == 'T':
s += 1
elif sym == 't':
s += 1
w += 1
return f'{s}{o}{g}{w}'
def __ext4extractor(self):
def scan_dir(root_inode, root_path=""):
for entry_name, entry_inode_idx, entry_type in root_inode.open_dir():
if entry_name in ['.', '..'] or entry_name.endswith(' (2)'):
continue
entry_inode = root_inode.volume.get_inode(entry_inode_idx, entry_type)
entry_inode_path = root_path + '/' + entry_name
print(entry_inode_path)
if entry_inode_path[-1:] == '/' and not entry_inode.is_dir:
continue
mode = self.__get_perm(entry_inode.mode_str)
uid = entry_inode.inode.i_uid
gid = entry_inode.inode.i_gid
cap = ''
link_target = ''
tmp_path = self.DIR + entry_inode_path
for f, e in entry_inode.xattrs():
if f == 'security.selinux':
t_p_mkc = tmp_path
for fuk_ in '\\^$.|?*+(){}[]':
t_p_mkc = t_p_mkc.replace(fuk_, '\\' + fuk_)
self.context.append(f"/{t_p_mkc} {e.decode('utf8')[:-1]}")
elif f == 'security.capability':
r = struct.unpack('<5I', e)
if r[1] > 65535:
cap = hex(int(f'{r[3]:04x}{r[1]:04x}', 16))
else:
cap = hex(int(f'{r[3]:04x}{r[2]:04x}{r[1]:04x}', 16))
cap = f" capabilities={cap}"
if entry_inode.is_symlink:
try:
link_target = entry_inode.open_read().read().decode("utf8")
except Exception and BaseException:
link_target_block = int.from_bytes(entry_inode.open_read().read(), "little")
link_target = root_inode.volume.read(link_target_block * root_inode.volume.block_size,
entry_inode.inode.i_size).decode("utf8")
if tmp_path.find(' ', 1, len(tmp_path)) > 0:
self.__append(tmp_path, os.path.join(self.CONFING_DIR, self.FileName + '_space.txt'))
self.fs_config.append(
f"{tmp_path.replace(' ', '_')} {uid} {gid} {mode}{cap} {link_target}")
else:
self.fs_config.append(
f'{tmp_path} {uid} {gid} {mode}{cap} {link_target}')
if entry_inode.is_dir:
dir_target = self.EXTRACT_DIR + entry_inode_path.replace(' ', '_').replace('"', '')
if dir_target.endswith('.') and os.name == 'nt':
dir_target = dir_target[:-1]
if not os.path.isdir(dir_target):
os.makedirs(dir_target)
if os.name == 'posix' and os.geteuid() == 0:
os.chmod(dir_target, int(mode, 8))
os.chown(dir_target, uid, gid)
scan_dir(entry_inode, entry_inode_path)
elif entry_inode.is_file:
file_target = self.EXTRACT_DIR + entry_inode_path.replace(' ', '_').replace('"', '')
try:
with open(file_target, 'wb') as out:
out.write(entry_inode.open_read().read())
except Exception and BaseException as e:
print(f'[E] Cannot Write {file_target}, Because of {e}')
if os.name == 'posix' and os.geteuid() == 0:
os.chmod(file_target, int(mode, 8))
os.chown(file_target, uid, gid)
elif entry_inode.is_symlink:
target = self.EXTRACT_DIR + entry_inode_path.replace(' ', '_')
try:
if os.path.islink(target) or os.path.isfile(target):
try:
os.remove(target)
finally:
...
if os.name == 'posix':
os.symlink(link_target, target)
elif os.name == 'nt':
with open(target.replace('/', os.sep), 'wb') as out:
out.write(b'!<symlink>' + link_target.encode('utf-16') + b'\x00\x00')
try:
windll.kernel32.SetFileAttributesA(LPCSTR(target.encode()),
DWORD(FILE_ATTRIBUTE_SYSTEM))
except Exception as e:
print(e.__str__())
except BaseException and Exception:
try:
if link_target and link_target.isprintable():
if os.name == 'posix':
os.symlink(link_target, target)
elif os.name == 'nt':
with open(target.replace('/', os.sep), 'wb') as out:
out.write(b'!<symlink>' + link_target.encode('utf-16') + b'\x00\x00')
try:
windll.kernel32.SetFileAttributesA(LPCSTR(target.encode()),
DWORD(FILE_ATTRIBUTE_SYSTEM))
except Exception as e:
print(e.__str__())
finally:
...
if not os.path.isdir(self.CONFING_DIR):
os.makedirs(self.CONFING_DIR)
self.__append(os.path.getsize(self.OUTPUT_IMAGE_FILE), self.CONFING_DIR + os.sep + self.FileName + '_size.txt')
with open(self.OUTPUT_IMAGE_FILE, 'rb') as file:
dir_r = self.__out_name(os.path.basename(self.OUTPUT_IMAGE_FILE).rsplit('.', 1)[0])
self.DIR = dir_r
scan_dir(ext4.Volume(file).root)
self.fs_config.insert(0, '/ 0 2000 0755' if dir_r == 'vendor' else '/ 0 0 0755')
self.fs_config.insert(1, f'{dir_r} 0 2000 0755' if dir_r == 'vendor' else '/lost+found 0 0 0700')
self.fs_config.insert(2 if dir_r == 'system' else 1, f'{dir_r} 0 0 0755')
self.__append('\n'.join(self.fs_config), self.CONFING_DIR + os.sep + self.FileName + '_fs_config')
p1 = p2 = 0
if self.context:
self.context.sort()
for c in self.context:
if re.search('/system/system/build..prop ', c) and p1 == 0:
self.context.insert(3, '/lost+\\found u:object_r:rootfs:s0')
self.context.insert(4, f'/{dir_r}/{dir_r}/(/.*)? ' + c.split()[1])
p1 = 1
if re.search('lost..found', c) and p2 == 0:
self.context.insert(0, '/ ' + c.split()[1])
self.context.insert(1, f'/{dir_r}(/.*)? ' + c.split()[1])
self.context.insert(2, f'/{dir_r} {c.split()[1]}')
self.context.insert(3, f'/{dir_r}/lost+\\found ' + c.split()[1])
p2 = 1
if p1 == p2 == 1:
break
self.__append('\n'.join(self.context), self.CONFING_DIR + os.sep + self.FileName + "_file_contexts")
@staticmethod
def fix_moto(input_file):
if not os.path.exists(input_file):
return
output_file = input_file + "_"
if os.path.exists(output_file):
try:
os.remove(output_file)
finally:
pass
with open(input_file, 'rb') as f:
data = f.read(500000)
if not re.search(b'\x4d\x4f\x54\x4f', data):
return
result = []
for i in re.finditer(b'\x53\xEF', data):
result.append(i.start() - 1080)
offset = 0
for i in result:
if data[i] == 0:
offset = i
break
if offset > 0:
with open(output_file, 'wb') as o, open(input_file, 'rb') as f:
f.seek(offset)
data = f.read(15360)
if data:
o.write(data)
if os.path.exists(output_file):
try:
os.remove(input_file)
os.rename(output_file, input_file)
finally:
pass
def fix_size(self):
orig_size = os.path.getsize(self.OUTPUT_IMAGE_FILE)
with open(self.OUTPUT_IMAGE_FILE, 'rb+') as file:
t = ext4.Volume(file)
real_size = t.get_block_count * t.block_size
if orig_size < real_size:
print(f"......Wrong Size!Fixing.......\nShould:{real_size}\nYours:{orig_size}")
file.truncate(real_size)
def main(self, target: str, output_dir: str, work: str, target_type: str = 'img'):
self.EXTRACT_DIR = os.path.realpath(os.path.dirname(output_dir)) + os.sep + self.__out_name(
os.path.basename(output_dir))
self.OUTPUT_IMAGE_FILE = (os.path.realpath(os.path.dirname(target)) + os.sep) + os.path.basename(target)
self.FileName = self.__out_name(os.path.basename(target), out=0)
self.CONFING_DIR = work + os.sep + 'config'
if target_type == 's_img':
simg2img(target)
target_type = 'img'
if target_type == 'img':
with open(os.path.abspath(self.OUTPUT_IMAGE_FILE), 'rb') as f:
data = f.read(500000)
if re.search(b'\x4d\x4f\x54\x4f', data):
print(".....MOTO structure! Fixing.....")
self.fix_moto(os.path.abspath(self.OUTPUT_IMAGE_FILE))
self.fix_size()
print("Extracting %s --> %s" % (os.path.basename(target), os.path.basename(self.EXTRACT_DIR)))
start = dti()
self.__ext4extractor()
print("Done! [%s]" % (dti() - start))