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Grand Slam Authentication (WIP)
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import srp | |
import plistlib as plist | |
from base64 import b64encode, b64decode | |
import requests | |
import json | |
import pbkdf2 | |
import hashlib | |
# Constants | |
DEBUG = True # Allows using a proxy for debugging (disables SSL verification) | |
# Server to use for anisette generation | |
ANISETTE = "https://sign.rheaa.xyz/" | |
GSA = "https://gsa.apple.com/grandslam/GsService2" # Self explanatory | |
# Allows you to use a proxy for debugging | |
if DEBUG: | |
# Disable SSL warnings | |
import urllib3 | |
urllib3.disable_warnings() | |
# mitmproxy | |
proxies = { | |
"http": "http://localhost:8080", | |
"https": "http://localhost:8080", | |
} | |
else: | |
proxies = {} | |
# This is quite necessary, I learned the hard way | |
srp.rfc5054_enable() | |
srp.no_username_in_x() | |
def generate_anisette() -> dict: | |
r = requests.get(ANISETTE, verify=False if DEBUG else True, proxies=proxies) | |
r = json.loads(r.text) | |
return r | |
def generate_cpd(anisette: dict) -> dict: | |
return { | |
# Many of these values are not strictly necessary, but may be tracked by Apple | |
# I've chosen to match the AltServer implementation | |
# Not sure what these are for, needs some investigation | |
"bootstrap": True, # All implementations set this to true | |
"icscrec": True, # Only AltServer sets this to true | |
"pbe": False, # All implementations explicitly set this to false | |
"prkgen": True, # I've also seen ckgen | |
"svct": "iCloud", # In certian circumstances, this can be 'iTunes' or 'iCloud' | |
# Not included, but I've also seen: | |
# 'capp': 'AppStore', | |
# 'dc': '#d4c5b3', | |
# 'dec': '#e1e4e3', | |
# 'prtn': 'ME349', | |
# 'AppleIDClientIdentifier': 'D4B7512F-E841-4AEA-A569-4F1E84738182', | |
# 'X-Apple-App-Info': 'com.apple.gs.xcode.auth', | |
# Current Time | |
"X-Apple-I-Client-Time": anisette["X-Apple-I-Client-Time"], | |
"X-Apple-I-TimeZone": anisette["X-Apple-I-TimeZone"], | |
# Locale | |
# Some implementations only use this for locale | |
"loc": anisette["X-Apple-Locale"], | |
"X-Apple-Locale": anisette["X-Apple-Locale"], | |
# Anisette | |
"X-Apple-I-MD": anisette["X-Apple-I-MD"], # 'One Time Password' | |
# 'Local User ID' | |
"X-Apple-I-MD-LU": anisette["X-Apple-I-MD-LU"], | |
"X-Apple-I-MD-M": anisette["X-Apple-I-MD-M"], # 'Machine ID' | |
# 'Routing Info', some implementations leave this as a string | |
"X-Apple-I-MD-RINFO": int(anisette["X-Apple-I-MD-RINFO"]), | |
# Device information | |
# 'Device Unique Identifier' | |
"X-Mme-Device-Id": anisette["X-Mme-Device-Id"], | |
# 'Device Serial Number' | |
"X-Apple-I-SRL-NO": anisette["X-Apple-I-SRL-NO"], | |
} | |
def authenticated_request(parameters, anisette) -> dict: | |
body = { | |
"Header": { | |
"Version": "1.0.1", | |
}, | |
"Request": { | |
"cpd": generate_cpd(anisette), | |
}, | |
} | |
body["Request"].update(parameters) | |
# print(plist.dumps(body).decode('utf-8')) | |
headers = { | |
"Content-Type": "text/x-xml-plist", | |
"Accept": "*/*", | |
"User-Agent": "akd/1.0 CFNetwork/978.0.7 Darwin/18.7.0", | |
"X-MMe-Client-Info": anisette["X-MMe-Client-Info"], | |
} | |
resp = requests.post( | |
"https://gsa.apple.com/grandslam/GsService2", | |
headers=headers, | |
data=plist.dumps(body), | |
verify=False, | |
proxies=proxies, | |
) | |
return plist.loads(resp.content)["Response"] | |
def check_error(r): | |
# Check for an error code | |
status = r["Status"] | |
if status["ec"] != 0: | |
print(f"Error {status['ec']}: {status['em']}") | |
return True | |
return False | |
def encrypt_password(password: str, salt: bytes, iterations: int) -> bytes: | |
p = hashlib.sha256(password.encode("utf-8")).digest() | |
return pbkdf2.PBKDF2(p, salt, iterations, hashlib.sha256).read(32) | |
def authenticate(username, password): | |
anisette = generate_anisette() | |
# Password is None as we'll provide it later | |
usr = srp.User(username, bytes(), hash_alg=srp.SHA256, ng_type=srp.NG_2048) | |
_, A = usr.start_authentication() | |
r = authenticated_request( | |
{ | |
"A2k": A, | |
"ps": ["s2k", "s2k_fo"], | |
"u": username, | |
"o": "init", | |
}, | |
anisette, | |
) | |
# Check for an error code | |
if check_error(r): | |
return | |
if r["sp"] != "s2k": | |
print(f"This implementation only supports s2k. Server returned {r['sp']}") | |
return | |
# Change the password out from under the SRP library, as we couldn't calculate it without the salt. | |
usr.p = encrypt_password(password, r["s"], r["i"]) | |
M = usr.process_challenge(r["s"], r["B"]) | |
# Make sure we processed the challenge correctly | |
if M is None: | |
print("Failed to process challenge") | |
return | |
r = authenticated_request( | |
{ | |
"c": r["c"], | |
"M1": M, | |
"u": username, | |
"o": "complete", | |
}, | |
anisette, | |
) | |
if check_error(r): | |
return | |
print(r) | |
# Make sure that the server's session key matches our session key (and thus that they are not an imposter) | |
usr.verify_session(r["M2"]) | |
if not usr.authenticated(): | |
print("Failed to verify session") | |
return |
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