59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
# django-kerberos - SPNEGO/Kerberos authentication for Django applications
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# Copyright (C) 2014-2019 Entr'ouvert
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import logging
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from django.core.exceptions import ImproperlyConfigured
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from django.utils.encoding import force_bytes
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from django.contrib.auth.hashers import BasePasswordHasher
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import kerberos
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from . import app_settings
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class KerberosHasher(BasePasswordHasher):
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'''A pseudo hasher which just validate that the given password
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match a given Kerberos identity'''
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algorithm = 'kerberos'
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def default_realm(self):
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'''Default realm for usernames without a realm'''
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return app_settings.DEFAULT_REALM
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def service_principal(self):
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if not app_settings.SERVICE_PRINCIPAL:
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raise ImproperlyConfigured(
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'Kerberos pseudo password hasher needs the setting '
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'KERBEROS_SERVICE_PRINCIPAL to be set')
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return app_settings.SERVICE_PRINCIPAL
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def verify(self, password, encoded):
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algorithm, principal = encoded.split('$', 2)
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assert algorithm == self.algorithm
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principal = force_bytes(principal)
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password = force_bytes(password)
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try:
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return kerberos.checkPassword(
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principal, password,
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self.service_principal(),
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self.default_realm())
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except kerberos.KrbError as e:
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logging.getLogger(__name__).error(
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'password validation for principal %r failed %s', principal, e)
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return False
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