def verify_id_token(instance, check_hash=False, **kwargs):
# Try to decode the JWT, checks the signature
args = {}
for arg in TOKEN_VERIFY_ARGS:
try:
args[arg] = kwargs[arg]
except KeyError:
pass
_jws = str(instance["id_token"])
# It can be encrypted, so try to decrypt first
_jwe = JWE_factory(_jws)
if _jwe is not None:
try:
_jws = _jwe.decrypt(keys=kwargs["keyjar"].get_decrypt_key())
except JWEException as err:
raise VerificationError("Could not decrypt id_token", err)
_packer = JWT()
_body = _packer.unpack(_jws).payload()
if "keyjar" in kwargs:
try:
if _body["iss"] not in kwargs["keyjar"]:
raise ValueError("Unknown issuer")
except KeyError:
raise MissingRequiredAttribute("iss")
if _jwe is not None:
# Use the original encrypted token to set correct headers
idt = IdToken().from_jwt(str(instance["id_token"]), **args)
else:
idt = IdToken().from_jwt(_jws, **args)
if not idt.verify(**kwargs):
raise VerificationError("Could not verify id_token", idt)
if check_hash:
_alg = idt.jws_header["alg"]
if _alg != "none":
hfunc = "HS" + _alg[-3:]
else:
# This is allowed only for `code` and it needs to be checked by a Client
hfunc = None
if "access_token" in instance and hfunc is not None:
if "at_hash" not in idt:
raise MissingRequiredAttribute("Missing at_hash property", idt)
if idt["at_hash"] != jws.left_hash(instance["access_token"],
hfunc):
raise AtHashError("Failed to verify access_token hash", idt)
if "code" in instance and hfunc is not None:
if "c_hash" not in idt:
raise MissingRequiredAttribute("Missing c_hash property", idt)
if idt["c_hash"] != jws.left_hash(instance["code"], hfunc):
raise CHashError("Failed to verify code hash", idt)
return idt
def verify_id_token(instance, check_hash=False, **kwargs):
# Try to decode the JWT, checks the signature
args = {}
for arg in ["key", "keyjar", "algs", "sender"]:
try:
args[arg] = kwargs[arg]
except KeyError:
pass
_jws = str(instance["id_token"])
# It can be encrypted, so try to decrypt first
_jwe = JWE_factory(_jws)
if _jwe is not None:
try:
_jws = _jwe.decrypt(keys=kwargs['keyjar'].get_decrypt_key())
except JWEException as err:
raise VerificationError("Could not decrypt id_token", err)
_packer = JWT()
_body = _packer.unpack(_jws).payload()
if 'keyjar' in kwargs:
try:
if _body['iss'] not in kwargs['keyjar']:
raise ValueError('Unknown issuer')
except KeyError:
raise MissingRequiredAttribute('iss')
if _jwe is not None:
# Use the original encrypted token to set correct headers
idt = IdToken().from_jwt(str(instance['id_token']), **args)
else:
idt = IdToken().from_jwt(_jws, **args)
if not idt.verify(**kwargs):
raise VerificationError("Could not verify id_token", idt)
if check_hash:
_alg = idt.jws_header["alg"]
# What if _alg == 'none'
hfunc = "HS" + _alg[-3:]
if "access_token" in instance:
if "at_hash" not in idt:
raise MissingRequiredAttribute("Missing at_hash property", idt)
if idt["at_hash"] != jws.left_hash(instance["access_token"],
hfunc):
raise AtHashError("Failed to verify access_token hash", idt)
if "code" in instance:
if "c_hash" not in idt:
raise MissingRequiredAttribute("Missing c_hash property", idt)
if idt["c_hash"] != jws.left_hash(instance["code"], hfunc):
raise CHashError("Failed to verify code hash", idt)
return idt
def verify_id_token(instance, check_hash=False, **kwargs):
# Try to decode the JWT, checks the signature
args = {}
for arg in ["key", "keyjar", "algs", "sender"]:
try:
args[arg] = kwargs[arg]
except KeyError:
pass
_jws = str(instance["id_token"])
# It can be encrypted, so try to decrypt first
_jwe = JWE_factory(_jws)
if _jwe is not None:
try:
_jws = _jwe.decrypt(keys=kwargs['keyjar'].get_decrypt_key())
except JWEException as err:
raise VerificationError("Could not decrypt id_token", err)
_packer = JWT()
_body = _packer.unpack(_jws).payload()
if 'keyjar' in kwargs:
try:
if _body['iss'] not in kwargs['keyjar']:
raise ValueError('Unknown issuer')
except KeyError:
raise MissingRequiredAttribute('iss')
if _jwe is not None:
# Use the original encrypted token to set correct headers
idt = IdToken().from_jwt(str(instance['id_token']), **args)
else:
idt = IdToken().from_jwt(_jws, **args)
if not idt.verify(**kwargs):
raise VerificationError("Could not verify id_token", idt)
if check_hash:
_alg = idt.jws_header["alg"]
# What if _alg == 'none'
hfunc = "HS" + _alg[-3:]
if "access_token" in instance:
if "at_hash" not in idt:
raise MissingRequiredAttribute("Missing at_hash property", idt)
if idt["at_hash"] != jws.left_hash(instance["access_token"], hfunc):
raise AtHashError("Failed to verify access_token hash", idt)
if "code" in instance:
if "c_hash" not in idt:
raise MissingRequiredAttribute("Missing c_hash property", idt)
if idt["c_hash"] != jws.left_hash(instance["code"], hfunc):
raise CHashError("Failed to verify code hash", idt)
return idt
def verify_poet_via_url(my_jws):
# load the Signed JWT (JWS)
my_jws = my_jws.rstrip().lstrip()
signed_token = JWS(my_jws)
# create aplain old JWT so we can fish out the 'iss'
t = JWT()
unpacked = t.unpack(token=my_jws)
payload = unpacked.payload()
if "iss" not in payload:
print("Missing 'iss' claim in the JWS payload.")
exit(1)
else:
iss = payload['iss']
# Fetch the public key from iss
url = "https://%s/.well-known/poet.jwk" % (iss)
r = requests.get(url)
if r.status_code != 200:
print("The key could not be fetched.")
exit(1)
# load the JWK into an RSA Key structure
rsak = RSAKey(**r.json())
try:
vt = signed_token.verify_compact(signed_token.msg, keys=[rsak])
retval = vt
except BadSignature:
retval = {"error": "The signature did not match"}
except NoSuitableSigningKeys:
retval = {"error": str(sys.exc_info()[1])}
except DeSerializationNotPossible:
retval = {"error": str(sys.exc_info()[1])}
except:
retval = {"error": str(sys.exc_info())}
return retval
# $ ssh-keygen -t rsa -b 4096
# and provide the foo filename with requested.
#
# Now a JWS can be created as follow:
# - retrieve the rsa key (the example below will also print it in the JWK section)
# - use the JWS object to create the token specifying the algorithm to be used for signing
# - call the method sign_compact providing an array of keys (eventually containing 1 key only) to be used for signing
# - the example belows shows the content of the JWT, by printing it
# - the signature can be verified with the method verify_compact (of course providing the same keys used for signing)
payload = {"iss": "jow",
"exp": 1300819380,
"http://example.com/is_root": True}
keys = [RSAKey(key=import_rsa_key_from_file("foo"))]
jws = JWS(payload, alg="RS512").sign_compact(keys)
print "jwt signed:", jws
print
########################################
jwt_received = JWT()
jwt_received.unpack(jws)
print "jwt headers:", jwt_received.headers
print "jwt part 1:", jwt_received.part[1]
print
_rj = JWS()
info = _rj.verify_compact(jws, keys)
print "Verified info:", info
# The JWS class can not work directly with rsa keys.
# In this case the rsa key is wrapped in a RSAKey
keys = [RSAKey(key=import_rsa_key_from_file("foo"))]
_jws = JWS(payload, alg="RS512")
_jwt = _jws.sign_compact(keys)
print("Signed jwt:", _jwt)
print()
# The JWT class can be used to peek into a JWT, whether is is signed or
# encrypted. It will not do any verificiation or decryption just unpacking
# the JWT.
jwt = JWT()
jwt.unpack(_jwt)
print("jwt headers:", jwt.headers)
# Part 0 is the headers
# Part 1 is the payload message
print("jwt part 1:", jwt.part[1])
print()
# If you want to verify the signature you have to use the JWS class
_rj = JWS()
# If everything is OK the verify_compact method will return the payload message
info = _rj.verify_compact(_jwt, keys)
print("Verified info:", info)
