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ckanext-saml2auth

A CKAN extension to enable Single Sign-On (SSO) for CKAN data portals via SAML2 Authentication.

Requirements

This extension works with CKAN 2.9+.

Installation

To install ckanext-saml2auth:

Install the required system packages:
```
sudo apt install xmlsec1
```
Activate your CKAN virtual environment, for example:
```
. /usr/lib/ckan/default/bin/activate
```

Install the required system packages to install the necessary python module dependencies:

# rustc and cargo are neeeded to build cryptography if no binary wheel exists
sudo apt install rustc cargo

Install the ckanext-saml2auth Python package into your virtual environment:
```
pip install ckanext-saml2auth
```
Add saml2auth to the ckan.plugins setting in your CKAN config file (by default the config file is located at /etc/ckan/default/ckan.ini).
Restart CKAN. For example if you've deployed CKAN with Apache on Ubuntu:
```
sudo service apache2 reload
```

Config settings

Required:

# Specifies the metadata location type
# Options: local or remote
ckanext.saml2auth.idp_metadata.location = remote

# Path to a local file accessible on the server the service runs on
# Ignore this config if the idp metadata location is set to: remote
ckanext.saml2auth.idp_metadata.local_path = /opt/metadata/idp.xml

# A remote URL serving aggregate metadata
# Ignore this config if the idp metadata location is set to: local
ckanext.saml2auth.idp_metadata.remote_url = https://kalmar2.org/simplesaml/module.php/aggregator/?id=kalmarcentral2&set=saml2

# Path to a local file accessible on the server the service runs on
# Ignore this config if the idp metadata location is set to: local and metadata is public
ckanext.saml2auth.idp_metadata.remote_cert = /opt/metadata/kalmar2.cert

# Corresponding SAML user field for firstname
ckanext.saml2auth.user_firstname = firstname

# Corresponding SAML user field for lastname
ckanext.saml2auth.user_lastname = lastname

# Corresponding SAML user field for fullname
# (Optional: Can be used as an alternative to firstname + lastname)
ckanext.saml2auth.user_fullname = fullname

# Corresponding SAML user field for email
ckanext.saml2auth.user_email = email

Optional:

# URL route of the endpoint where the SAML assertion is sent, also known as Assertion Consumer Service (ACS).
# Default: /acs
ckanext.saml2auth.acs_endpoint = /sso/post

# Configuration setting that enables CKAN's internal register/login functionality as well
# Default: False
ckanext.saml2auth.enable_ckan_internal_login = True

# List of email addresses from users that should be created as sysadmins (system administrators)
# Note that this means that CKAN sysadmins will _only_ be managed based on this config option and will override existing user permissions in the CKAN database
# If not set then it is ignored and CKAN sysadmins are managed through normal means
# Default: <Not set>
ckanext.saml2auth.sysadmins_list = mail@domain.com mail2@domain.com mail3@domain.com

# Indicates that attributes that are not recognized (they are not configured in attribute-mapping),
# will not be discarded.
# Default: True
ckanext.saml2auth.allow_unknown_attributes = False

# A list of string values that will be used to set the <NameIDFormat> element of the metadata of an entity.
# Default: urn:oasis:names:tc:SAML:2.0:nameid-format:persistent
ckanext.saml2auth.sp.name_id_format = urn:oasis:names:tc:SAML:2.0:nameid-format:persistent urn:oasis:names:tc:SAML:2.0:nameid-format:transient

# A string value that will be used to set the Format attribute of the <NameIDPolicy> element of the metadata of an entity.
# Default: <Not set>
ckanext.saml2auth.sp.name_id_policy_format = urn:oasis:names:tc:SAML:2.0:nameid-format:persistent

# Entity ID (also know as Issuer)
# Define the entity ID. Default is urn:mace:umu.se:saml:ckan:sp
ckanext.saml2auth.entity_id = urn:gov:gsa:SAML:2.0.profiles:sp:sso:gsa:catalog-dev

# Signed responses and assertions
ckanext.saml2auth.want_response_signed = True
ckanext.saml2auth.want_assertions_signed = False
ckanext.saml2auth.want_assertions_or_response_signed = False

# Cert & key files
ckanext.saml2auth.key_file_path = /path/to/mykey.pem
ckanext.saml2auth.cert_file_path = /path/to/mycert.pem

# Attribute map directory
ckanext.saml2auth.attribute_map_dir = /path/to/dir/attributemaps

# Authentication context request before redirect to login
# e.g. to ask for a PIV card with login.gov provider (https://developers.login.gov/oidc/#aal-values) use:
ckanext.saml2auth.requested_authn_context = http://idmanagement.gov/ns/assurance/aal/3?hspd12=true
# You can use multiple context separated by spaces
ckanext.saml2auth.requested_authn_context = req1 req2

# Define the comparison value for RequestedAuthnContext
# Comparison could be one of this: exact, minimum, maximum or better
ckanext.saml2auth.requested_authn_context_comparison = exact

# Indicates if this entity will sign the Logout Requests originated from it
ckanext.saml2auth.logout_requests_signed = False

# Saml logout request preferred binding settings variable
# Default: urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST
ckanext.saml2auth.logout_expected_binding =  urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST

# Default fallback endpoint to redirect to if no RelayState provided in the SAML Response
# Default: user.me (ie /dashboard)
# e.g. to redirect to the home page
ckanext.saml2auth.default_fallback_endpoint = home.index

Plugin interface

This extension provides the [ISaml2Auth]{.title-ref} interface that allows other plugins to hook into the Saml2 authorization flow. This allows plugins to integrate custom logic like:

Include additional attributes returned via the IdP as [plugin_extras]{.title-ref} in the CKAN users
Assign users to specific organizations with specific roles based on Saml2 attributes
Customize the flow response, to eg issue redirects or include custom headers.

For a list of available methods and their parameters check the ckanext/saml2auth/interfaces.py file, and for a basic example see the ExampleISaml2AuthPlugin class.

Developer installation

To install ckanext-saml2auth for development, activate your CKAN virtualenv and do:

sudo apt install xmlsec1
git clone https://github.com/duskobogdanovski/ckanext-saml2auth.git
cd ckanext-saml2auth
python setup.py develop
pip install -r dev-requirements.txt

Tests

To run the tests, do:

pytest --ckan-ini=test.ini

To run the tests and produce a coverage report, first make sure you have pytest-cov installed in your virtualenv (pip install pytest-cov) then run:

pytest --ckan-ini=test.ini  --cov=ckanext.saml2auth

Releasing a new version of ckanext-saml2auth

ckanext-saml2auth should be available on PyPI as https://pypi.org/project/ckanext-saml2auth. To publish a new version to PyPI follow these steps:

Update the version number in the setup.py file. See PEP 440 for how to choose version numbers.
Make sure you have the latest version of necessary packages:
```
pip install --upgrade setuptools wheel twine
```
Create a source and binary distributions of the new version:
```
python setup.py sdist bdist_wheel && twine check dist/*
```
Fix any errors you get.
Upload the source distribution to PyPI:
```
twine upload dist/*
```
Commit any outstanding changes:
```
git commit -a
git push
```
Tag the new release of the project on GitHub with the version number from the setup.py file. For example if the version number in setup.py is 0.0.1 then do:
```
git tag 0.0.1
git push --tags
```