128 lines
4.7 KiB
Python
128 lines
4.7 KiB
Python
import logging
|
|
import json
|
|
import os
|
|
|
|
from data.users.federated import FederatedUsers, UserInformation
|
|
from util.security import jwtutil
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ExternalJWTAuthN(FederatedUsers):
|
|
""" Delegates authentication to a REST endpoint that returns JWTs. """
|
|
PUBLIC_KEY_FILENAME = 'jwt-authn.cert'
|
|
|
|
def __init__(self, verify_url, query_url, getuser_url, issuer, override_config_dir, http_client,
|
|
max_fresh_s, public_key_path=None, requires_email=True):
|
|
super(ExternalJWTAuthN, self).__init__('jwtauthn', requires_email)
|
|
self.verify_url = verify_url
|
|
self.query_url = query_url
|
|
self.getuser_url = getuser_url
|
|
|
|
self.issuer = issuer
|
|
self.client = http_client
|
|
self.max_fresh_s = max_fresh_s
|
|
self.requires_email = requires_email
|
|
|
|
default_key_path = os.path.join(override_config_dir, ExternalJWTAuthN.PUBLIC_KEY_FILENAME)
|
|
public_key_path = public_key_path or default_key_path
|
|
if not os.path.exists(public_key_path):
|
|
error_message = ('JWT Authentication public key file "%s" not found' % public_key_path)
|
|
|
|
raise Exception(error_message)
|
|
|
|
self.public_key_path = public_key_path
|
|
|
|
with open(public_key_path) as public_key_file:
|
|
self.public_key = public_key_file.read()
|
|
|
|
def has_password_set(self, username):
|
|
return True
|
|
|
|
def ping(self):
|
|
result = self.client.get(self.getuser_url, timeout=2)
|
|
# We expect a 401 or 403 of some kind, since we explicitly don't send an auth header
|
|
if result.status_code // 100 != 4:
|
|
return (False, result.text or 'Could not reach JWT authn endpoint')
|
|
|
|
return (True, None)
|
|
|
|
def get_user(self, username_or_email):
|
|
if self.getuser_url is None:
|
|
return (None, 'No endpoint defined for retrieving user')
|
|
|
|
(payload, err_msg) = self._execute_call(self.getuser_url, 'quay.io/jwtauthn/getuser',
|
|
params=dict(username=username_or_email))
|
|
if err_msg is not None:
|
|
return (None, err_msg)
|
|
|
|
if not 'sub' in payload:
|
|
raise Exception('Missing sub field in JWT')
|
|
|
|
if self.requires_email and not 'email' in payload:
|
|
raise Exception('Missing email field in JWT')
|
|
|
|
# Parse out the username and email.
|
|
user_info = UserInformation(username=payload['sub'], email=payload.get('email'),
|
|
id=payload['sub'])
|
|
return (user_info, None)
|
|
|
|
|
|
def query_users(self, query, limit=20):
|
|
if self.query_url is None:
|
|
return (None, self.federated_service, 'No endpoint defined for querying users')
|
|
|
|
(payload, err_msg) = self._execute_call(self.query_url, 'quay.io/jwtauthn/query',
|
|
params=dict(query=query, limit=limit))
|
|
if err_msg is not None:
|
|
return (None, self.federated_service, err_msg)
|
|
|
|
query_results = []
|
|
for result in payload['results'][0:limit]:
|
|
user_info = UserInformation(username=result['username'], email=result.get('email'),
|
|
id=result['username'])
|
|
query_results.append(user_info)
|
|
|
|
return (query_results, self.federated_service, None)
|
|
|
|
|
|
def verify_credentials(self, username_or_email, password):
|
|
(payload, err_msg) = self._execute_call(self.verify_url, 'quay.io/jwtauthn',
|
|
auth=(username_or_email, password))
|
|
if err_msg is not None:
|
|
return (None, err_msg)
|
|
|
|
if not 'sub' in payload:
|
|
raise Exception('Missing sub field in JWT')
|
|
|
|
if self.requires_email and not 'email' in payload:
|
|
raise Exception('Missing email field in JWT')
|
|
|
|
user_info = UserInformation(username=payload['sub'], email=payload.get('email'),
|
|
id=payload['sub'])
|
|
return (user_info, None)
|
|
|
|
|
|
def _execute_call(self, url, aud, auth=None, params=None):
|
|
""" Executes a call to the external JWT auth provider. """
|
|
result = self.client.get(url, timeout=2, auth=auth, params=params)
|
|
if result.status_code != 200:
|
|
return (None, result.text or 'Could not make JWT auth call')
|
|
|
|
try:
|
|
result_data = json.loads(result.text)
|
|
except ValueError:
|
|
raise Exception('Returned JWT body for url %s does not contain JSON', url)
|
|
|
|
# Load the JWT returned.
|
|
encoded = result_data.get('token', '')
|
|
exp_limit_options = jwtutil.exp_max_s_option(self.max_fresh_s)
|
|
try:
|
|
payload = jwtutil.decode(encoded, self.public_key, algorithms=['RS256'],
|
|
audience=aud, issuer=self.issuer,
|
|
options=exp_limit_options)
|
|
return (payload, None)
|
|
except jwtutil.InvalidTokenError:
|
|
logger.exception('Exception when decoding returned JWT for url %s', url)
|
|
return (None, 'Exception when decoding returned JWT')
|