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fetch-macOS-v2.py
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#!/usr/bin/env python3
# pylint: disable=C0301,C0116,C0103,R0903
"""
Gather recovery information for Macs.
Copyright (c) 2019, vit9696
macrecovery is a tool that helps to automate recovery interaction. It can be
used to download diagnostics and recovery as well as analyse MLB.
Requires python to run. Run with `-h` argument to see all available arguments.
Upstream: https://github.com/acidanthera/OpenCorePkg/tree/master/Utilities/macrecovery
pylint -> Your code has been rated at -0.08/10 ;(
"""
import argparse
import hashlib
import json
import linecache
import os
import random
import struct
import string
import sys
try:
from urllib.request import Request, HTTPError, urlopen
from urllib.parse import urlparse
except ImportError:
print('ERROR: Python 2 is not supported, please use Python 3')
sys.exit(1)
SELF_DIR = os.path.dirname(os.path.realpath(__file__))
# MacPro7,1
RECENT_MAC = 'Mac-27AD2F918AE68F61'
MLB_ZERO = '00000000000000000'
MLB_VALID = 'F5K105303J9K3F71M'
MLB_PRODUCT = 'F5K00000000K3F700'
TYPE_SID = 16
TYPE_K = 64
TYPE_FG = 64
INFO_PRODUCT = 'AP'
INFO_IMAGE_LINK = 'AU'
INFO_IMAGE_HASH = 'AH'
INFO_IMAGE_SESS = 'AT'
INFO_SIGN_LINK = 'CU'
INFO_SIGN_HASH = 'CH'
INFO_SIGN_SESS = 'CT'
INFO_REQURED = [INFO_PRODUCT, INFO_IMAGE_LINK, INFO_IMAGE_HASH, INFO_IMAGE_SESS, INFO_SIGN_LINK, INFO_SIGN_HASH, INFO_SIGN_SESS]
# Use -2 for better resize stability on Windows
TERMINAL_MARGIN = 2
def run_query(url, headers, post=None, raw=False):
if post is not None:
data = '\n'.join(entry + '=' + post[entry] for entry in post).encode()
else:
data = None
req = Request(url=url, headers=headers, data=data)
try:
response = urlopen(req)
if raw:
return response
return dict(response.info()), response.read()
except HTTPError as e:
print(f'ERROR: "{e}" when connecting to {url}')
sys.exit(1)
def generate_id(id_type, id_value=None):
return id_value or ''.join(random.choices(string.hexdigits[:16].upper(), k=id_type))
def product_mlb(mlb):
return '00000000000' + mlb[11:15] + '00'
def mlb_from_eeee(eeee):
if len(eeee) != 4:
print('ERROR: Invalid EEEE code length!')
sys.exit(1)
return f'00000000000{eeee}00'
# zhangyoufu https://gist.github.com/MCJack123/943eaca762730ca4b7ae460b731b68e7#gistcomment-3061078 2021-10-08
Apple_EFI_ROM_public_key_1 = 0xC3E748CAD9CD384329E10E25A91E43E1A762FF529ADE578C935BDDF9B13F2179D4855E6FC89E9E29CA12517D17DFA1EDCE0BEBF0EA7B461FFE61D94E2BDF72C196F89ACD3536B644064014DAE25A15DB6BB0852ECBD120916318D1CCDEA3C84C92ED743FC176D0BACA920D3FCF3158AFF731F88CE0623182A8ED67E650515F75745909F07D415F55FC15A35654D118C55A462D37A3ACDA08612F3F3F6571761EFCCBCC299AEE99B3A4FD6212CCFFF5EF37A2C334E871191F7E1C31960E010A54E86FA3F62E6D6905E1CD57732410A3EB0C6B4DEFDABE9F59BF1618758C751CD56CEF851D1C0EAA1C558E37AC108DA9089863D20E2E7E4BF475EC66FE6B3EFDCF
ChunkListHeader = struct.Struct('<4sIBBBxQQQ')
assert ChunkListHeader.size == 0x24
Chunk = struct.Struct('<I32s')
assert Chunk.size == 0x24
def verify_chunklist(cnkpath):
with open(cnkpath, 'rb') as f:
hash_ctx = hashlib.sha256()
data = f.read(ChunkListHeader.size)
hash_ctx.update(data)
magic, header_size, file_version, chunk_method, signature_method, chunk_count, chunk_offset, signature_offset = ChunkListHeader.unpack(data)
assert magic == b'CNKL'
assert header_size == ChunkListHeader.size
assert file_version == 1
assert chunk_method == 1
assert signature_method in [1, 2]
assert chunk_count > 0
assert chunk_offset == 0x24
assert signature_offset == chunk_offset + Chunk.size * chunk_count
for _ in range(chunk_count):
data = f.read(Chunk.size)
hash_ctx.update(data)
chunk_size, chunk_sha256 = Chunk.unpack(data)
yield chunk_size, chunk_sha256
digest = hash_ctx.digest()
if signature_method == 1:
data = f.read(256)
assert len(data) == 256
signature = int.from_bytes(data, 'little')
plaintext = int(f'0x1{"f"*404}003031300d060960864801650304020105000420{"0"*64}', 16) | int.from_bytes(digest, 'big')
assert pow(signature, 0x10001, Apple_EFI_ROM_public_key_1) == plaintext
elif signature_method == 2:
data = f.read(32)
assert data == digest
raise RuntimeError('Chunklist missing digital signature')
else:
raise NotImplementedError
assert f.read(1) == b''
def get_session(args):
headers = {
'Host': 'osrecovery.apple.com',
'Connection': 'close',
'User-Agent': 'InternetRecovery/1.0',
}
headers, _ = run_query('http://osrecovery.apple.com/', headers)
if args.verbose:
print('Session headers:')
for header in headers:
print(f'{header}: {headers[header]}')
for header in headers:
if header.lower() == 'set-cookie':
cookies = headers[header].split('; ')
for cookie in cookies:
return cookie if cookie.startswith('session=') else ...
raise RuntimeError('No session in headers ' + str(headers))
def get_image_info(session, bid, mlb=MLB_ZERO, diag=False, os_type='default', cid=None):
headers = {
'Host': 'osrecovery.apple.com',
'Connection': 'close',
'User-Agent': 'InternetRecovery/1.0',
'Cookie': session,
'Content-Type': 'text/plain',
}
post = {
'cid': generate_id(TYPE_SID, cid),
'sn': mlb,
'bid': bid,
'k': generate_id(TYPE_K),
'fg': generate_id(TYPE_FG)
}
if diag:
url = 'http://osrecovery.apple.com/InstallationPayload/Diagnostics'
else:
url = 'http://osrecovery.apple.com/InstallationPayload/RecoveryImage'
post['os'] = os_type
headers, output = run_query(url, headers, post)
output = output.decode('utf-8')
info = {}
for line in output.split('\n'):
try:
key, value = line.split(': ')
info[key] = value
except KeyError:
continue
except ValueError:
continue
for k in INFO_REQURED:
if k not in info:
raise RuntimeError(f'Missing key {k}')
return info
def save_image(url, sess, filename='', directory=''):
purl = urlparse(url)
headers = {
'Host': purl.hostname,
'Connection': 'close',
'User-Agent': 'InternetRecovery/1.0',
'Cookie': '='.join(['AssetToken', sess])
}
if not os.path.exists(directory):
os.makedirs(directory)
if filename == '':
filename = os.path.basename(purl.path)
if filename.find(os.sep) >= 0 or filename == '':
raise RuntimeError('Invalid save path ' + filename)
print(f'Saving {url} to {directory}{os.sep}{filename}...')
with open(os.path.join(directory, filename), 'wb') as fh:
response = run_query(url, headers, raw=True)
headers = dict(response.headers)
totalsize = -1
for header in headers:
if header.lower() == 'content-length':
totalsize = int(headers[header])
break
size = 0
oldterminalsize = 0
while True:
chunk = response.read(2**20)
if not chunk:
break
fh.write(chunk)
size += len(chunk)
try:
terminalsize = max(os.get_terminal_size().columns - TERMINAL_MARGIN, 0)
except OSError:
terminalsize = 80
if oldterminalsize != terminalsize:
print(f'\r{"":<{terminalsize}}', end='')
oldterminalsize = terminalsize
if totalsize > 0:
progress = size / totalsize
barwidth = terminalsize // 3
print(f'\r{size / (2**20):.1f}/{totalsize / (2**20):.1f} MB ', end='')
if terminalsize > 55:
print(f'|{"=" * int(barwidth * progress):<{barwidth}}|', end='')
print(f' {progress*100:.1f}% downloaded', end='')
else:
# Fallback if Content-Length isn't available
print(f'\r{size / (2**20)} MB downloaded...', end='')
sys.stdout.flush()
print('\nDownload complete!')
return os.path.join(directory, os.path.basename(filename))
def verify_image(dmgpath, cnkpath):
print('Verifying image with chunklist...')
with open(dmgpath, 'rb') as dmgf:
for cnkcount, (cnksize, cnkhash) in enumerate(verify_chunklist(cnkpath), 1):
terminalsize = max(os.get_terminal_size().columns - TERMINAL_MARGIN, 0)
print(f'\r{f"Chunk {cnkcount} ({cnksize} bytes)":<{terminalsize}}', end='')
sys.stdout.flush()
cnk = dmgf.read(cnksize)
if len(cnk) != cnksize:
raise RuntimeError(f'Invalid chunk {cnkcount} size: expected {cnksize}, read {len(cnk)}')
if hashlib.sha256(cnk).digest() != cnkhash:
raise RuntimeError(f'Invalid chunk {cnkcount}: hash mismatch')
if dmgf.read(1) != b'':
raise RuntimeError('Invalid image: larger than chunklist')
print('\nImage verification complete!')
def action_download(args):
"""
Reference information for queries:
Recovery latest:
cid=3076CE439155BA14
sn=...
bid=Mac-E43C1C25D4880AD6
k=4BE523BB136EB12B1758C70DB43BDD485EBCB6A457854245F9E9FF0587FB790C
os=latest
fg=B2E6AA07DB9088BE5BDB38DB2EA824FDDFB6C3AC5272203B32D89F9D8E3528DC
Recovery default:
cid=4A35CB95FF396EE7
sn=...
bid=Mac-E43C1C25D4880AD6
k=0A385E6FFC3DDD990A8A1F4EC8B98C92CA5E19C9FF1DD26508C54936D8523121
os=default
fg=B2E6AA07DB9088BE5BDB38DB2EA824FDDFB6C3AC5272203B32D89F9D8E3528DC
Diagnostics:
cid=050C59B51497CEC8
sn=...
bid=Mac-E43C1C25D4880AD6
k=37D42A8282FE04A12A7D946304F403E56A2155B9622B385F3EB959A2FBAB8C93
fg=B2E6AA07DB9088BE5BDB38DB2EA824FDDFB6C3AC5272203B32D89F9D8E3528DC
"""
session = get_session(args)
info = get_image_info(session, bid=args.board_id, mlb=args.mlb, diag=args.diagnostics, os_type=args.os_type)
if args.verbose:
print(info)
print(f'Downloading {info[INFO_PRODUCT]}...')
cnkname = '' if args.basename == '' else args.basename + '.chunklist'
cnkpath = save_image(info[INFO_SIGN_LINK], info[INFO_SIGN_SESS], cnkname, args.outdir)
dmgname = '' if args.basename == '' else args.basename + '.dmg'
dmgpath = save_image(info[INFO_IMAGE_LINK], info[INFO_IMAGE_SESS], dmgname, args.outdir)
try:
verify_image(dmgpath, cnkpath)
return 0
except Exception as err:
if isinstance(err, AssertionError) and str(err) == '':
try:
tb = sys.exc_info()[2]
while tb.tb_next:
tb = tb.tb_next
err = linecache.getline(tb.tb_frame.f_code.co_filename, tb.tb_lineno, tb.tb_frame.f_globals).strip()
except Exception:
err = "Invalid chunklist"
print(f'\rImage verification failed. ({err})')
return 1
def action_selfcheck(args):
"""
Sanity check server logic for recovery:
if not valid(bid):
return error()
ppp = get_ppp(sn)
if not valid(ppp):
return latest_recovery(bid = bid) # Returns newest for bid.
if valid(sn):
if os == 'default':
return default_recovery(sn = sn, ppp = ppp) # Returns oldest for sn.
else:
return latest_recovery(sn = sn, ppp = ppp) # Returns newest for sn.
return default_recovery(ppp = ppp) # Returns oldest.
"""
session = get_session(args)
valid_default = get_image_info(session, bid=RECENT_MAC, mlb=MLB_VALID, diag=False, os_type='default')
valid_latest = get_image_info(session, bid=RECENT_MAC, mlb=MLB_VALID, diag=False, os_type='latest')
product_default = get_image_info(session, bid=RECENT_MAC, mlb=MLB_PRODUCT, diag=False, os_type='default')
product_latest = get_image_info(session, bid=RECENT_MAC, mlb=MLB_PRODUCT, diag=False, os_type='latest')
generic_default = get_image_info(session, bid=RECENT_MAC, mlb=MLB_ZERO, diag=False, os_type='default')
generic_latest = get_image_info(session, bid=RECENT_MAC, mlb=MLB_ZERO, diag=False, os_type='latest')
if args.verbose:
print(valid_default)
print(valid_latest)
print(product_default)
print(product_latest)
print(generic_default)
print(generic_latest)
if valid_default[INFO_PRODUCT] == valid_latest[INFO_PRODUCT]:
# Valid MLB must give different default and latest if this is not a too new product.
print(f'ERROR: Cannot determine any previous product, got {valid_default[INFO_PRODUCT]}')
return 1
if product_default[INFO_PRODUCT] != product_latest[INFO_PRODUCT]:
# Product-only MLB must give the same value for default and latest.
print(f'ERROR: Latest and default do not match for product MLB, got {product_default[INFO_PRODUCT]} and {product_latest[INFO_PRODUCT]}')
return 1
if generic_default[INFO_PRODUCT] != generic_latest[INFO_PRODUCT]:
# Zero MLB always give the same value for default and latest.
print(f'ERROR: Generic MLB gives different product, got {generic_default[INFO_PRODUCT]} and {generic_latest[INFO_PRODUCT]}')
return 1
if valid_latest[INFO_PRODUCT] != generic_latest[INFO_PRODUCT]:
# Valid MLB must always equal generic MLB.
print(f'ERROR: Cannot determine unified latest product, got {valid_latest[INFO_PRODUCT]} and {generic_latest[INFO_PRODUCT]}')
return 1
if product_default[INFO_PRODUCT] != valid_default[INFO_PRODUCT]:
# Product-only MLB can give the same value with valid default MLB.
# This is not an error for all models, but for our chosen code it is.
print(f'ERROR: Valid and product MLB give mismatch, got {product_default[INFO_PRODUCT]} and {valid_default[INFO_PRODUCT]}')
return 1
print('SUCCESS: Found no discrepancies with MLB validation algorithm!')
return 0
def action_verify(args):
"""
Try to verify MLB serial number.
"""
session = get_session(args)
generic_latest = get_image_info(session, bid=RECENT_MAC, mlb=MLB_ZERO, diag=False, os_type='latest')
uvalid_default = get_image_info(session, bid=args.board_id, mlb=args.mlb, diag=False, os_type='default')
uvalid_latest = get_image_info(session, bid=args.board_id, mlb=args.mlb, diag=False, os_type='latest')
uproduct_default = get_image_info(session, bid=args.board_id, mlb=product_mlb(args.mlb), diag=False, os_type='default')
if args.verbose:
print(generic_latest)
print(uvalid_default)
print(uvalid_latest)
print(uproduct_default)
# Verify our MLB number.
if uvalid_default[INFO_PRODUCT] != uvalid_latest[INFO_PRODUCT]:
print(f'SUCCESS: {args.mlb} MLB looks valid and supported!' if uvalid_latest[INFO_PRODUCT] == generic_latest[INFO_PRODUCT] else f'SUCCESS: {args.mlb} MLB looks valid, but probably unsupported!')
return 0
print('UNKNOWN: Run selfcheck, check your board-id, or try again later!')
# Here we have matching default and latest products. This can only be true for very
# new models. These models get either latest or special builds.
if uvalid_default[INFO_PRODUCT] == generic_latest[INFO_PRODUCT]:
print(f'UNKNOWN: {args.mlb} MLB can be valid if very new!')
return 0
if uproduct_default[INFO_PRODUCT] != uvalid_default[INFO_PRODUCT]:
print(f'UNKNOWN: {args.mlb} MLB looks invalid, other models use product {uproduct_default[INFO_PRODUCT]} instead of {uvalid_default[INFO_PRODUCT]}!')
return 0
print(f'UNKNOWN: {args.mlb} MLB can be valid if very new and using special builds!')
return 0
def action_guess(args):
"""
Attempt to guess which model does this MLB belong.
"""
mlb = args.mlb
anon = mlb.startswith('000')
with open(args.board_db, 'r', encoding='utf-8') as fh:
db = json.load(fh)
supported = {}
session = get_session(args)
generic_latest = get_image_info(session, bid=RECENT_MAC, mlb=MLB_ZERO, diag=False, os_type='latest')
for model in db:
try:
if anon:
# For anonymous lookup check when given model does not match latest.
model_latest = get_image_info(session, bid=model, mlb=MLB_ZERO, diag=False, os_type='latest')
if model_latest[INFO_PRODUCT] != generic_latest[INFO_PRODUCT]:
if db[model] == 'current':
print(f'WARN: Skipped {model} due to using latest product {model_latest[INFO_PRODUCT]} instead of {generic_latest[INFO_PRODUCT]}')
continue
user_default = get_image_info(session, bid=model, mlb=mlb, diag=False, os_type='default')
if user_default[INFO_PRODUCT] != generic_latest[INFO_PRODUCT]:
supported[model] = [db[model], user_default[INFO_PRODUCT], generic_latest[INFO_PRODUCT]]
else:
# For normal lookup check when given model has mismatching normal and latest.
user_latest = get_image_info(session, bid=model, mlb=mlb, diag=False, os_type='latest')
user_default = get_image_info(session, bid=model, mlb=mlb, diag=False, os_type='default')
if user_latest[INFO_PRODUCT] != user_default[INFO_PRODUCT]:
supported[model] = [db[model], user_default[INFO_PRODUCT], user_latest[INFO_PRODUCT]]
except Exception as e:
print(f'WARN: Failed to check {model}, exception: {e}')
if len(supported) > 0:
print(f'SUCCESS: MLB {mlb} looks supported for:')
for model in supported.items():
print(f'- {model}, up to {supported[model][0]}, default: {supported[model][1]}, latest: {supported[model][2]}')
return 0
print(f'UNKNOWN: Failed to determine supported models for MLB {mlb}!')
return None
# https://stackoverflow.com/questions/2280334/shortest-way-of-creating-an-object-with-arbitrary-attributes-in-python
class gdata:
"""
A string to make pylint happy ;)
"""
def __init__(self, **kwargs):
self.__dict__.update(kwargs)
def main():
parser = argparse.ArgumentParser(description='Gather recovery information for Macs')
parser.add_argument('--action', choices=['download', 'selfcheck', 'verify', 'guess'], default='',
help='Action to perform: "download" - performs recovery downloading,'
' "selfcheck" checks whether MLB serial validation is possible, "verify" performs'
' MLB serial verification, "guess" tries to find suitable mac model for MLB.')
parser.add_argument('-o', '--outdir', type=str, default='com.apple.recovery.boot',
help='customise output directory for downloading, defaults to com.apple.recovery.boot')
parser.add_argument('-n', '--basename', type=str, default='',
help='customise base name for downloading, defaults to remote name')
parser.add_argument('-b', '--board-id', type=str, default=RECENT_MAC,
help=f'use specified board identifier for downloading, defaults to {RECENT_MAC}')
parser.add_argument('-m', '--mlb', type=str, default=MLB_ZERO,
help=f'use specified logic board serial for downloading, defaults to {MLB_ZERO}')
parser.add_argument('-e', '--code', type=str, default='',
help='generate product logic board serial with specified product EEEE code')
parser.add_argument('-os', '--os-type', type=str, default='default', choices=['default', 'latest'],
help=f'use specified os type, defaults to default {MLB_ZERO}')
parser.add_argument('-diag', '--diagnostics', action='store_true', help='download diagnostics image')
parser.add_argument('-s', '--shortname', type=str, default='',
help='available options: high-sierra, mojave, catalina, big-sur, monterey, ventura')
parser.add_argument('-v', '--verbose', action='store_true', help='print debug information')
parser.add_argument('-db', '--board-db', type=str, default=os.path.join(SELF_DIR, 'boards.json'),
help='use custom board list for checking, defaults to boards.json')
args = parser.parse_args()
if args.code != '':
args.mlb = mlb_from_eeee(args.code)
if len(args.mlb) != 17:
print('ERROR: Cannot use MLBs in non 17 character format!')
sys.exit(1)
if args.action == 'download':
return action_download(args)
if args.action == 'selfcheck':
return action_selfcheck(args)
if args.action == 'verify':
return action_verify(args)
if args.action == 'guess':
return action_guess(args)
# No action specified, so present a download menu instead
# https://github.com/acidanthera/OpenCorePkg/blob/master/Utilities/macrecovery/boards.json
# https://github.com/corpnewt/gibMacOS
products = [
{"name": "High Sierra (10.13)", "b": "Mac-7BA5B2D9E42DDD94", "m": "00000000000J80300", "short": "high-sierra"},
{"name": "Mojave (10.14)", "b": "Mac-7BA5B2DFE22DDD8C", "m": "00000000000KXPG00", "short": "mojave"},
{"name": "Catalina (10.15)", "b": "Mac-00BE6ED71E35EB86", "m": "00000000000000000", "short": "catalina"},
{"name": "Big Sur (11.7)", "b": "Mac-2BD1B31983FE1663", "m": "00000000000000000", "short": "big-sur"},
{"name": "Monterey (12.6)", "b": "Mac-B809C3757DA9BB8D", "m": "00000000000000000", "os_type": "latest", "short": "monterey"},
{"name": "Ventura (13) - RECOMMENDED", "b": "Mac-4B682C642B45593E", "m": "00000000000000000", "os_type": "latest", "short": "ventura"},
{"name": "Sonoma (14) ", "b": "Mac-827FAC58A8FDFA22", "m": "00000000000000000", "short": "sonoma"},
{"name": "Sequoia (15) ", "b": "Mac-7BA5B2D9E42DDD94", "m": "00000000000000000", "short": "Sequoia", "os_type": "latest"},
]
for index, product in enumerate(products):
name = product["name"]
print('%s. %12s' % (index + 1, name))
# test locally using args.shortname = 'mojave'
if not args.shortname or args.shortname == '':
answer = input('\nChoose a product to download (1-%s): ' % len(products))
try:
index = int(answer) - 1
if index < 0:
raise ValueError
except (ValueError, IndexError):
pass
else:
index = 0
for product in products:
if args.shortname == product['short']:
break
else:
index = index+1
product = products[index]
try:
os_type = product["os_type"]
except:
os_type = "default"
args = gdata(mlb = product["m"], board_id = product["b"], diagnostics =
False, os_type = os_type, verbose=False, basename="", outdir=".")
action_download(args)
if __name__ == '__main__':
sys.exit(main())