OpenSlides SAML Plugin

This app for OpenSlides provides a login via a SAML single-sign-on service.

Requirements

Install python3-saml via pip install python3-saml.

Note: python3-saml needs thy python package xmlsec <https://pypi.python.org/pypi/xmlsec/1.3.3>_ which depends on libxml2 <http://xmlsoft.org/>_. Those packages need to be installed on a Debian-like system::

$ apt-get install libxml2-dev libxmlsec1-dev libxmlsec1-openssl pkg-config

For more information about other operating systems or distributions visit http://pythonhosted.org/xmlsec/install.html.

Configuration

Enable the feature by setting ENABLE_SAML=True in the settings.py. Make sure you have installed the extra dependencies from the section above.

On startup of OpenSlides the saml_settings.json is created in the settings folder if it does not exist. To force creating this file run

$ python manage.py create-saml-settings [--dir /<path to custom settings dir>/]

The path has to match with the settings path OpenSlides is started with.

For the first part in the settings file refer to python3-saml settings documentation <https://github.com/onelogin/python3-saml#settings>_. All settings described there are merged into the saml_settings.json. Also note the README file in the certs folder next to the saml_settings.json.

Additional Settings

The following settings are given in the saml_settings.json. All entries are required, except for the request settings.

General settings

Here you can provide a custom text for the SAML login button. The changePasswordUrl redirects the user to the given URL when click on Change password in the OpenSlides user menu.

Attributes

The identity provider sends attributes to the server if a user sucessfully logged in. To map these attributes to attributes of OpenSlides users, the section attributeMapping exists. The structure is like this::

"attributeMapping: {
    "attributeFromIDP": ["attributeOfOpenSlidesUser", <used for lookup>],
    "anotherAttributeFromIDP": ["anotherAttributeOfOpenSlidesUser", <used for lookup>]
}

All available OpenSlides user attributes are:

username: Has to be unique. Identifies the user.
first_name: The user's first name.
last_name: The user's last name.
title: The title of the user, e.g. "Dr.".
email: The user's email addreess.
structure_level: The structure level.
number: The participant number (text, not an actual number). Note: This field is not unique.
about_me: A free text field.
is_active, is_present, is_committee: Boolean flags.

To get detailed information see the models.py

The <used for lookup> has either to be true or false. All attributes with this value being true are used to search for an existing user. If the user is found, the user gets updated with all changed values and used to log in. If the user is not found, it will be created with all values given. Try to choose unique attributes (e.g. the username), attributes you are sure about to be unique (e.g. maybe the number) or use a combination of attributes.

Requests

One can overwrite the data extracted from the request headers of saml-requests. E.g. if the public port is 80 and the server is reverse-proxied and listen to port 8000, one should set the server_port to 80, so OpenSlides does not take the port of the request header. If not specified all these values are taken from the requests meta information:

https: Either on or off.
http_host: The hostname.
script_name: The aquivalent to PATH_INFO in the meta values.
server_port: The port listen by the server.

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