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git_extract.py
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# -*- coding: utf-8 -*-
__author__ = 'gakki429'
import os
import re
import sys
import ssl
import zlib
import urllib2
from lib.git_pack import GitPack
from lib.git_index import GitIndex
from lib.utils import _mkdir, _print
urllib2.getproxies = lambda: {}
class GitExtract(object):
"""Git Extract without git command"""
def __init__(self, git_host):
if os.path.exists(git_host):
self.git_path = git_host
self.local = True
elif (git_host.startswith('http')
and git_host.endswith('/')):
self.git_path = re.search(r'https?://(.*)',
git_host).group(1).replace(':', '_')
self.local = False
_mkdir(self.git_path)
else:
_print('Usage:\n\tpython {} http://example.com/.git/'.format((sys.argv[0])), 'red')
sys.exit(0)
self.objects = {}
self.refs_hash = set()
self.git_host = git_host
self._logo()
_print('[*] Start Extract')
_print('[*] Target Git: {}'.format(self.git_host))
os.chdir(self.git_path)
def _logo(self):
Logo = """
________.__ __ ___________ __ __
/ _____/|__|/ |_ \_ _____/__ ____/ |_____________ _____/ |_
/ \ ___| \ __\ | __)_\ \/ /\ __\_ __ \__ \ _/ ___\ __\\
\ \_\ \ || | | \> < | | | | \// __ \\\\ \___| |
\______ /__||__| /_______ /__/\_ \ |__| |__| (____ /\___ >__|
\/ \/ \/ \/ \/
Author: gakki429
"""
_print(Logo, 'green')
def download_file(self, path):
if os.path.exists(path):
return open(path, 'rb').read()
if self.local:
return
url = self.git_host + path
try:
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
resp = urllib2.urlopen(url, context=ctx)
if resp.getcode() == 200:
data = resp.read()
_mkdir(path)
open(path, 'wb').write(data)
return data
except Exception as e:
# _print('[-] File not exist {} '.format(path), 'red')
return
def git_object_parse(self, _hash):
path = 'objects/{}/{}'.format(_hash[:2], _hash[2:])
file = self.download_file(path)
try:
data = zlib.decompress(file)
_type, _len, _file = re.findall("^(tag|blob|tree|commit) (\d+?)\x00(.*)", data, re.S|re.M)[0]
if int(_len) == len(_file):
self.objects[_hash] = _type
return _type, _len, _file
else:
self.objects[_hash] = 'unknown'
except TypeError:
self.objects[_hash] = 'unknown'
def git_file_type(self, mode):
if mode in ['160000']:
return 'commit'
elif mode in ['40000']:
return 'tree'
elif mode in ['100644', '100664', '100755', '120000']:
return 'blob'
def git_ls_tree(self, _hash):
tree = self.git_object_parse(_hash)
try:
tree = set(re.findall("(\d{5,6}) (.*?)\x00(.{20})", tree[2], re.M|re.S))
except TypeError:
tree = set()
tree_result = set()
for _mode, _path, _hash in tree:
_type = self.git_file_type(_mode)
_hash = _hash.encode('hex')
tree_result.add((_type, _hash, _path))
return tree_result
def git_save_blob(self, _dir, _path, _hash, save_file=False):
filename = _dir + _path
try:
data = self.git_object_parse(_hash)[2]
except TypeError:
return
if os.path.isfile(filename):
file = open(filename, 'rb').read()
if file != data:
filename = '{}{}.{}'.format(_dir, _path, _hash[:6])
if not os.path.isfile(filename):
# 这里的逻辑有待完善，虽然hash[:6]基本不会重复
save_file = True
else:
save_file = True
if save_file:
_print('[+] Save {}'.format(filename), 'green')
open(filename, 'wb').write(data)
def git_parse_tree(self, _hash, _dir='../'):
_mkdir(_dir)
_print('[*] Parse Tree {} {}'.format(_dir, _hash[:6]))
tree = self.git_ls_tree(_hash)
for _type, _hash, _path in tree:
if _type == 'blob':
self.git_save_blob(_dir, _path, _hash)
elif _type == 'tree':
self.git_parse_tree(_hash, '{}{}/'.format(_dir, _path))
elif _type == 'commit':
self.git_commit(_hash)
else:
_print('[-] unknown {} {}'.format(
self.git_object_parse(_hash)[0], _hash), 'red')
def git_commit(self, _hash, data=''):
_print('[*] Clone Commit {}'.format(_hash[:6]))
if not data:
commit = self.git_object_parse(_hash)
else:
commit = data
# 考虑到parent的hash可以利用于是修改为
self.git_extract_by_hash(commit[2])
def git_tag(self, _hash, data=''):
if not data:
tag = self.git_object_parse(_hash)
else:
tag = data
if not data:
return
_print('[*] Parse Tag {}'.format(_hash[:6]))
self.git_extract_by_hash(tag[2])
def git_head(self):
head = self.download_file('HEAD')
if head:
_print('[*] Analyze .git/HEAD')
refs = re.findall(r'ref: (.*)', head, re.M)
self.git_refs(refs)
def git_refs(self, refs):
for ref in refs:
try:
ref_hash = self.download_file(ref).strip()
_print('[+] Extract Ref {} {}'.format(ref, ref_hash[:6]))
data = self.git_object_parse(ref_hash)
if data[0] == 'commit':
self.git_commit(ref_hash, data)
elif data[0] == 'tag':
self.git_tag(ref_hash, data)
except:
_print('[-] Except With Extract Ref {}'.format(ref), 'red')
def git_extract_by_hash(self, data):
if not data:
return
data_hash = set(re.findall(r'[0-9a-z]{40}', data)) - set(self.objects.keys())
if '0'*40 in data_hash:
data_hash.remove('0'*40)
for _hash in data_hash:
try:
_type, _len, file = self.git_object_parse(_hash)
except TypeError:
continue
if _type == 'commit':
self.git_commit(_hash)
elif _type == 'tree':
self.git_parse_tree(_hash)
elif _type == 'tag':
self.git_tag(_hash)
elif _type == 'blob':
self.git_save_blob('../', '{}_impossible_file.txt'.format(_hash[:6]), _hash)
def git_logs(self):
logs = self.download_file('logs/HEAD')
if logs:
_print('[*] Analyze .git/logs/HEAD')
self.git_extract_by_hash(logs)
def git_parse_info_refs(self):
info_refs = 'info/refs'
refs = self.download_file(info_refs)
if not refs:
return
_print('[*] Detect .git/info/refs')
refs_info = re.findall(r'([a-z0-9]{40})\t(.*)', refs)
for _hash, ref in refs_info:
_mkdir(ref)
open(ref, 'wb').write(_hash+'\n')
self.git_refs([ref])
def git_parse_pack(self):
pack_path = 'objects/info/packs'
packs = self.download_file(pack_path)
if not packs:
return
_print('[*] Detect .git/objects/info/packs')
packs_hash = re.findall('P pack-([a-z0-9]{40}).pack', packs, re.S|re.M)
pack_object_hash = set()
for pack_hash in packs_hash:
pack = GitPack(self.git_path, pack_hash)
pack.pack_init()
pack_object_hash.update(pack.objects.keys())
self.git_parse_info_refs()
# 下面是应对未知情况，正常是hash都已经被解析
unparse_hash = pack_object_hash - set(self.objects.keys())
if unparse_hash:
_print('[+] Parse Left Pack Object Hash')
self.git_extract_by_hash('\n'.join(unparse_hash))
def git_stash(self):
stash = self.download_file('refs/stash')
if stash:
_print('[*] Detect .git/refs/stash')
self.git_extract_by_hash(stash)
def git_index_cache(self):
index_data = self.download_file('index')
if not index_data:
return
_print('[*] Detect .git/index')
index = GitIndex(self.git_path)
index.index_init()
for tree_hash in index.tree_objects.keys():
if tree_hash not in self.objects.keys():
self.git_parse_tree(tree_hash)
left_file = set(index.blob_objects.keys()) - set(self.objects.keys())
for _hash in left_file:
file = index.blob_objects[_hash]
path = file['filename']
self.git_save_blob('../', path, _hash)
def git_other(self):
hash_path = [
'packed-refs',
'refs/remotes/origin/HEAD',
'ORIG_HEAD',
'FETCH_HEAD',
]
info_path = [
'config',
'description',
'info/exclude',
'COMMIT_EDITMSG',
]
for path in hash_path:
data = self.download_file(path)
if data:
self.git_extract_by_hash(data)
for path in info_path:
self.download_file(path)
def git_init(self):
self.git_head()
self.git_logs()
self.git_index_cache()
self.git_stash()
self.git_parse_pack()
self.git_other()
_print('[*] Extract Done')
if __name__ == '__main__':
if len(sys.argv) == 2:
GIT_HOST = sys.argv[1]
Git = GitExtract(GIT_HOST)
Git.git_init()
else:
_print('Usage:\n\tpython {} http://example.com/.git/'.format((sys.argv[0])), 'red')