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Fallback to basic auth if GSSAPI mechanism is unsupported

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Quantum 2020-02-20 08:05:34 +00:00
parent 429ba3ff48
commit e6b5b137e2
1 changed files with 10 additions and 4 deletions
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14
nginx_krbauth.py
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@ -13,7 +13,7 @@ from urllib.parse import quote
import gssapi
import ldap
from flask import Flask, request, redirect, url_for, Response
from gssapi.exceptions import GSSError, GeneralError
from gssapi.exceptions import GSSError, GeneralError, BadMechanismError
app = Flask(__name__)
app.logger.setLevel(logging.INFO)
@ -78,7 +78,7 @@ def verify_cookie(cookie, context):
return hmac.compare_digest(expected, signature)
def make_401(reason, context, auth='Negotiate', **kwargs):
def make_401(reason, context, negotiate='Negotiate', **kwargs):
app.logger.info('Returning unauthorized: %s (%s)', reason, kwargs)
resp = Response('''\
<html>
@ -92,7 +92,8 @@ def make_401(reason, context, auth='Negotiate', **kwargs):
</body>
</html>
''' % (reason,), status=401)
resp.headers.add('WWW-Authenticate', auth)
if auth:
resp.headers.add('WWW-Authenticate', negotiate)
if LDAP_USER_DN:
resp.headers.add('WWW-Authenticate', 'Basic')
return resp
@ -115,9 +116,11 @@ def auth_spnego(context, next_url):
out_token = krb5_ctx.step(in_token)
if not krb5_ctx.complete:
return make_401('Negotiation in progress', context, auth=['Negotiate ' + base64.b64encode(out_token)])
return make_401('Negotiation in progress', context, negotiate=['Negotiate ' + base64.b64encode(out_token)])
krb5_name = krb5_ctx._inquire(initiator_name=True).initiator_name
except BadMechanismError:
return make_401('GSSAPI mechanism not supported', context, negotiate=None)
except (GSSError, GeneralError) as e:
return make_401(str(e), context)
@ -143,6 +146,9 @@ def auth_basic(context, next_url):
except (binascii.Error, UnicodeDecodeError):
return Response(status=400)
if not username or not password:
return make_401('Invalid username or password', context)
dn = LDAP_USER_DN % (username,)
ldap_ctx = ldap.initialize(LDAP_SERVER)
try: