does someone already have sso via shibboleth configured (not SAML)? In the features list it says:
Simply configure Shibboleth for the Zammad IdP and initiate the authentication. There is no documentation for this yet, so just let us know if you need help!
So is there maybe someone who can provide some hints how to configure sso via shibboleth?
After you have Zammad working with Apache you can configure libapache2-mod-shib / shibd as usual and require authentication for the /auth/sso Location in the Apache configuration.
You can Enable “Authentication via SSO” in Settings > Security > Third-Party Applications after you have verified that /auth/sso is configured and redirects you to your Shibboleth IDP.
SSO in Zamamd does not provision new users, so you need to configure some way to sync your users into Zammad, LDAP is usually the most sane way.
Also you have to ensure that you configure your Shibboleth SP to put the value into REMOTE_USER as the one that is used in Zammads login field.