def process_request(self, request):
# The identity of external collaborators is managed within the django application.
# Therefore, exclude the external collaborator login form from the SCW Remote User
# Middleware.
if request.path.startswith(reverse('external-login')):
return
# 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 setting to insert "
"'django.contrib.auth.middleware.AuthenticationMiddleware' "
"before the RemoteUserMiddleware class.")
# Prevent the user from logging in if the django application requires the user to
# reauthenticate with their shibboleth identity provider.
# This will require the user to close their browser.
if request.session.get(
settings.SHIBBOLETH_FORCE_REAUTH_SESSION_KEY) == True:
return
# Locate the required headers.
try:
username = request.META[self.header]
identity_provider = request.META['Shib-Identity-Provider']
except KeyError:
# If the required headers do not exist then return, leaving request.user set to
# AnonymousUser by the AuthenticationMiddleware.
return
# If we got an empty value for REMOTE USER header, it's an anonymous user.
if not username:
if self.force_logout_if_no_header and request.user.is_authenticated:
self._remove_invalid_user(request)
return
# Ensure the Shib-Identity-Provider is supported / valid.
try:
Institution.is_valid_identity_provider(identity_provider)
except InvalidIndentityProvider:
return
# The REMOTE USER header may return the authenticated user's email address or username.
email_regex = r'(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)'
if not re.match(email_regex, username):
# Must append the institutions base domain to the username.
institution = Institution.objects.get(
identity_provider=identity_provider)
username = '******'.join([username, institution.base_domain])
# If the user is already authenticated and that user is the user we are getting passed in
# the headers, then the correct user is already persisted in the session and we don't need
# to continue.
if request.user.is_authenticated:
if request.user.username == self.clean_username(username, request):
return
else:
self._remove_invalid_user(request)
# Make sure we have all required Shibboleth elements before proceeding.
shib_meta, error = ShibbolethRemoteUserMiddleware.parse_attributes(
request)
# Add parsed attributes to the session.
request.session['shib'] = shib_meta
request.session['shib']['username'] = username # Override
if error:
raise ShibbolethValidationError(
'All required Shibboleth elements not found. %s' % shib_meta)
# We are seeing this user for the first time in this session, attempt to authenticate
# the user.
user = auth.authenticate(remote_user=username, shib_meta=shib_meta)
if user:
# Set request.user and persist user in the session by logging the user in.
request.user = user
auth.login(request, user)
else:
# Redirect the user to apply for an account.
url_name = resolve(request.path_info).url_name
if url_name != 'register':
return HttpResponseRedirect(reverse('register'))
