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| import functools
import gzip
import hashlib
import json
import os
import shutil
import sys
import tarfile
from io import BytesIO
import requests
import urllib3
proxies = {
'http': 'http://127.0.0.1:1081',
'https': 'http://127.0.0.1:1081'
}
proxy_get = functools.partial(requests.get, proxies=proxies)
urllib3.disable_warnings()
if len(sys.argv) != 2:
print('Usage:\n\tdocker_pull.py [registry/][repository/]image[:tag|@digest]\n')
exit(1)
repo = 'library'
tag = 'latest'
imgparts = sys.argv[1].split('/')
try:
img, tag = imgparts[-1].split('@')
except ValueError:
try:
img, tag = imgparts[-1].split(':')
except ValueError:
img = imgparts[-1]
if len(imgparts) > 1 and ('.' in imgparts[0] or ':' in imgparts[0]):
registry = imgparts[0]
repo = '/'.join(imgparts[1:-1])
else:
registry = 'registry-1.docker.io'
if len(imgparts[:-1]) != 0:
repo = '/'.join(imgparts[:-1])
else:
repo = 'library'
repository = '{}/{}'.format(repo, img)
auth_url = 'https://auth.docker.io/token'
reg_service = 'registry.docker.io'
resp = proxy_get('https://{}/v2/'.format(registry), verify=False)
if resp.status_code == 401:
auth_url = resp.headers['WWW-Authenticate'].split('"')[1]
try:
reg_service = resp.headers['WWW-Authenticate'].split('"')[3]
except IndexError:
reg_service = ""
resp = proxy_get('{}?service={}&scope=repository:{}:pull'.format(auth_url, reg_service, repository), verify=False)
access_token = resp.json()['token']
auth_head = {'Authorization': 'Bearer ' + access_token,
'Accept': 'application/vnd.docker.distribution.manifest.v2+json'}
resp = proxy_get('https://{}/v2/{}/manifests/{}'.format(registry, repository, tag), headers=auth_head, verify=False)
if (resp.status_code != 200):
print('[-] Cannot fetch manifest for {} [HTTP {}]'.format(repository, resp.status_code))
print(resp.content)
auth_head = {'Authorization': 'Bearer ' + access_token,
'Accept': 'application/vnd.docker.distribution.manifest.list.v2+json'}
resp = proxy_get('https://{}/v2/{}/manifests/{}'.format(registry, repository, tag), headers=auth_head,
verify=False)
if (resp.status_code == 200):
print('[+] Manifests found for this tag (use the @digest format to pull the corresponding image):')
manifests = resp.json()['manifests']
for manifest in manifests:
for key, value in manifest["platform"].items():
sys.stdout.write('{}: {}, '.format(key, value))
print('digest: {}'.format(manifest["digest"]))
exit(1)
layers = resp.json()['layers']
imgdir = 'tmp_{}_{}'.format(img, tag.replace(':', '@'))
os.mkdir(imgdir)
print('Creating image structure in: ' + imgdir)
config = resp.json()['config']['digest']
confresp = proxy_get('https://{}/v2/{}/blobs/{}'.format(registry, repository, config), headers=auth_head,
verify=False)
file = open('{}/{}.json'.format(imgdir, config[7:]), 'wb')
file.write(confresp.content)
file.close()
content = [{
'Config': config[7:] + '.json',
'RepoTags': [],
'Layers': []
}]
if len(imgparts[:-1]) != 0:
content[0]['RepoTags'].append('/'.join(imgparts[:-1]) + '/' + img + ':' + tag)
else:
content[0]['RepoTags'].append(img + ':' + tag)
empty_json = '{"created":"1970-01-01T00:00:00Z","container_config":{"Hostname":"","Domainname":"","User":"","AttachStdin":false, \
"AttachStdout":false,"AttachStderr":false,"Tty":false,"OpenStdin":false, "StdinOnce":false,"Env":null,"Cmd":null,"Image":"", \
"Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":null}}'
parentid = ''
for layer in layers:
ublob = layer['digest']
fake_layerid = hashlib.sha256((parentid + '\n' + ublob + '\n').encode('utf-8')).hexdigest()
layerdir = imgdir + '/' + fake_layerid
os.mkdir(layerdir)
file = open(layerdir + '/VERSION', 'w')
file.write('1.0')
file.close()
sys.stdout.write(ublob[7:19] + ': Downloading...')
sys.stdout.flush()
bresp = proxy_get('https://{}/v2/{}/blobs/{}'.format(registry, repository, ublob), headers=auth_head,
verify=False)
if (bresp.status_code != 200):
bresp = proxy_get(layer['urls'][0], headers=auth_head, verify=False)
if (bresp.status_code != 200):
print('\rERROR: Cannot download layer {} [HTTP {}]'.format(ublob[7:19], bresp.status_code,
bresp.headers['Content-Length']))
print(bresp.content)
exit(1)
print("\r{}: Pull complete [{}]".format(ublob[7:19], bresp.headers['Content-Length']))
content[0]['Layers'].append(fake_layerid + '/layer.tar')
file = open(layerdir + '/layer.tar', "wb")
mybuff = BytesIO(bresp.content)
unzLayer = gzip.GzipFile(fileobj=mybuff)
file.write(unzLayer.read())
unzLayer.close()
file.close()
file = open(layerdir + '/json', 'w')
if layers[-1]['digest'] == layer['digest']:
json_obj = json.loads(confresp.content)
del json_obj['history']
del json_obj['rootfs']
else:
json_obj = json.loads(empty_json)
json_obj['id'] = fake_layerid
if parentid:
json_obj['parent'] = parentid
parentid = json_obj['id']
file.write(json.dumps(json_obj))
file.close()
file = open(imgdir + '/manifest.json', 'w')
file.write(json.dumps(content))
file.close()
if len(imgparts[:-1]) != 0:
content = {'/'.join(imgparts[:-1]) + '/' + img: {tag: fake_layerid}}
else:
content = {img: {tag: fake_layerid}}
file = open(imgdir + '/repositories', 'w')
file.write(json.dumps(content))
file.close()
docker_tar = repo.replace('/', '_') + '_' + img + '.tar'
tar = tarfile.open(docker_tar, "w")
tar.add(imgdir, arcname=os.path.sep)
tar.close()
shutil.rmtree(imgdir)
print('Docker image pulled: ' + docker_tar)
print('Compress the tar file with transport: tar -zcf ' + docker_tar + '.gz' + docker_tar)
print('Load the image: docker load -i ' + docker_tar)
|