This document describes how to make use of external authentication sources
(where the Web server sets the
REMOTE_USER environment variable) in your
Django applications. This type of authentication solution is typically seen on
intranet sites, with single sign-on solutions such as IIS and Integrated
Windows Authentication or Apache and mod_authnz_ldap, CAS, Cosign,
WebAuth, mod_auth_sspi, etc.
When the Web server takes care of authentication it typically sets the
REMOTE_USER environment variable for use in the underlying application. In
REMOTE_USER is made available in the
request.META attribute. Django can be configured to make
use of the
REMOTE_USER value using the
RemoteUserBackend classes found in
First, you must add the
django.contrib.auth.middleware.RemoteUserMiddleware to the
MIDDLEWARE setting after the
MIDDLEWARE = [ '...', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.auth.middleware.RemoteUserMiddleware', '...', ]
AUTHENTICATION_BACKENDS = [ 'django.contrib.auth.backends.RemoteUserBackend', ]
With this setup,
RemoteUserMiddleware will detect the username in
request.META['REMOTE_USER'] and will authenticate and auto-login that user
Be aware that this particular setup disables authentication with the default
ModelBackend. This means that if the
REMOTE_USER value is not set
then the user is unable to log in, even using Django’s admin interface.
'django.contrib.auth.backends.ModelBackend' to the
AUTHENTICATION_BACKENDS list will use
ModelBackend as a fallback
REMOTE_USER is absent, which will solve these issues.
Django’s user management, such as the views in
createsuperuser management command, doesn’t integrate with
remote users. These interfaces work with users stored in the database
RemoteUserBackend inherits from
ModelBackend, you will
still have all of the same permissions checking that is implemented in
If your authentication mechanism uses a custom HTTP header and not
REMOTE_USER, you can subclass
RemoteUserMiddleware and set the
header attribute to the desired
request.META key. For example:
from django.contrib.auth.middleware import RemoteUserMiddleware class CustomHeaderMiddleware(RemoteUserMiddleware): header = 'HTTP_AUTHUSER'
Be very careful if using a
RemoteUserMiddleware subclass with a custom
HTTP header. You must be sure that your front-end web server always sets or
strips that header based on the appropriate authentication checks, never
permitting an end-user to submit a fake (or “spoofed”) header value. Since
the HTTP headers
X-Auth_User (for example) both
normalize to the
HTTP_X_AUTH_USER key in
request.META, you must
also check that your web server doesn’t allow a spoofed header using
underscores in place of dashes.
This warning doesn’t apply to
RemoteUserMiddleware in its default
header = 'REMOTE_USER', since a key that doesn’t
request.META can only be set by your WSGI
server, not directly from an HTTP request header.
If you need more control, you can create your own authentication backend
that inherits from
override one or more of its attributes and methods.
REMOTE_USER on login pages only¶
RemoteUserMiddleware authentication middleware assumes that the HTTP
REMOTE_USER is present with all authenticated requests. That
might be expected and practical when Basic HTTP Auth with
similar mechanisms are used, but with Negotiate (GSSAPI/Kerberos) or other
resource intensive authentication methods, the authentication in the front-end
HTTP server is usually only set up for one or a few login URLs, and after
successful authentication, the application is supposed to maintain the
authenticated session itself.
provides support for this use case. It will maintain the authenticated session
until explicit logout by the user. The class can be used as a drop-in
in the documentation above.