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# Copyright 2013 The Distro Tracker Developers
# See the COPYRIGHT file at http://deb.li/DTAuthors
#
# Adapted to work directly with the django user model
# instead of DistroTracker UserEmail
# 2016 Neil Williams <neil.williams@linaro.org>
#
# This file is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along
# with this program; if not, see <http://www.gnu.org/licenses>.
import ldap
from django.contrib.auth.middleware import RemoteUserMiddleware
from django.contrib.auth.backends import RemoteUserBackend
from django.contrib import auth
from django.contrib.auth.models import User
from django.core.exceptions import ImproperlyConfigured
class DebianSsoUserMiddleware(RemoteUserMiddleware):
"""
Middleware that initiates user authentication based on the REMOTE_USER
field provided by Debian's SSO system, or based on the SSL_CLIENT_S_DN_CN
field provided by the validation of the SSL client certificate generated
by sso.debian.org.
If the currently logged in user is a DD (as identified by having a
@debian.org address), he is forcefully logged out if the header is no longer
found or is invalid.
To enable, set "AUTH_DEBIAN_SSO" = true in /etc/lava-server/settings.conf
(JSON syntax). There is no deduplication of users in lava-server, it is
NOT supported to have Debian SSO and LDAP configured on the same instance.
"""
dacs_header = 'REMOTE_USER'
cert_header = 'SSL_CLIENT_S_DN_CN'
@staticmethod
def dacs_user_to_email(username):
parts = [part for part in username.split(':') if part]
federation, jurisdiction = parts[:2]
if (federation, jurisdiction) != ('DEBIANORG', 'DEBIAN'):
return
username = parts[-1]
if '@' in username:
return username # Full email already
return username + '@debian.org'
@staticmethod
def is_debian_member(user):
return user.email.endswith('@debian.org')
def process_request(self, request):
# AuthenticationMiddleware is required so that request.user exists.
if not hasattr(request, 'user'):
raise ImproperlyConfigured(
"The Django remote user auth middleware requires the"
" authentication middleware to be installed. Edit your"
" MIDDLEWARE_CLASSES setting to insert"
" 'django.contrib.auth.middleware.AuthenticationMiddleware'"
" before the DebianSsoUserMiddleware class.")
dacs_user = request.META.get(self.dacs_header)
cert_user = request.META.get(self.cert_header)
if cert_user is not None:
remote_user = cert_user
elif dacs_user is not None:
remote_user = self.dacs_user_to_email(dacs_user)
else:
# Debian developers can only authenticate via SSO/SSL certs
# so log them out now if they no longer have the proper META
# variable
if request.user.is_authenticated():
if self.is_debian_member(request.user):
auth.logout(request)
return
if request.user.is_authenticated():
user = User.objects.filter(email=request.user.email)
if user.exists():
# The currently logged in user matches the one given by the
# headers.
return
# This will create the user if it doesn't exist
user = auth.authenticate(remote_user=remote_user)
if user:
# User is valid. Set request.user and persist user in the session
# by logging the user in.
request.user = user
auth.login(request, user)
class DebianSsoUserBackend(RemoteUserBackend):
"""
The authentication backend which authenticates the provided remote user
(identified by his @debian.org email) in Django. If a matching User
model instance does not exist, one is automatically created. In that case
the DDs first and last name are pulled from Debian's LDAP.
"""
def generate_unique_username(self, count, slug):
username = '%s%d' % (slug, count)
try:
User.objects.get(username=username)
count += 1
return self.generate_unique_username(count, slug)
except User.DoesNotExist:
return username
def ensure_unique_username(self, username):
count = 0
try:
User.objects.get(username=username)
return self.generate_unique_username(count, username)
except User.DoesNotExist:
return username
def authenticate(self, remote_user):
if not remote_user:
return
user = User.objects.filter(email=remote_user)
if user:
return user[0]
kwargs = {}
names = self.get_user_details(remote_user)
if names:
kwargs.update(names)
username = "sso-user"
email_list = remote_user.split('@')
if len(email_list) > 1:
username = email_list[0]
username = self.ensure_unique_username(username)
user = User.objects.create_user(username=username, email=remote_user, **kwargs)
return user
@staticmethod
def get_uid(remote_user):
# Strips off the @debian.org part of the email leaving the uid
if remote_user.endswith('@debian.org'):
return remote_user[:-11]
return remote_user
def get_user_details(self, remote_user):
"""
Gets the details of the given user from the Debian LDAP.
:return: Dict with the keys ``first_name``, ``last_name``
``None`` if the LDAP lookup did not return anything.
"""
if ldap is None:
return None
if not remote_user.endswith('@debian.org'):
# We only know how to extract data for DD via LDAP
return None
service = ldap.initialize('ldap://db.debian.org')
result_set = service.search_s(
'dc=debian,dc=org',
ldap.SCOPE_SUBTREE, # pylint: disable=no-member
'uid={}'.format(self.get_uid(remote_user)),
None)
if not result_set:
return None
result = result_set[0]
return {
'first_name': result[1]['cn'][0].decode('utf-8'),
'last_name': result[1]['sn'][0].decode('utf-8'),
}
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