A Discourse Plugin to enable authentication via SAML
Setting up your idp: The entity-id should be: http://example.com The consumer assertion service url should be: https://example.com/auth/saml/callback
You may need to set your idp to send an extra custom attribute 'screenName', that will become the users id.
For idp-initated SSO, use the following URL: https://example.com/auth/saml/callback
For Docker based installations:
Add the following settings to your app.yml file in the Environment Settings section:
## Saml plugin setting
DISCOURSE_SAML_TARGET_URL: https://idpvendor.com/saml/login/
DISCOURSE_SAML_CERT_FINGERPRINT: "43:BB:DA:FF..."
#DISCOURSE_SAML_REQUEST_METHOD: post
#DISCOURSE_SAML_FULL_SCREEN_LOGIN: true
DISCOURSE_SAML_CERT: "-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----"
The DISCOURSE_FULL_SCREEN_LOGIN option allows the SSO login page to be presented within the main browser window, rather than a popup. If SAML is your only authentication method this can look neater, as when the user clicks the Log In button the login page will follow through within the main browser window rather than opening a pop-up. This setting is commented out by default - if you want full screen login uncomment that line and set the value to true (as per the example above).
For non docker:
Add the following settings to your discourse.conf file:
saml_target_url
If the idp has an RSA key split up as modulus and exponent, this javascript library makes it easy to convert to pem:
https://www.npmjs.com/package/rsa-pem-from-mod-exp
MIT