In my environment all users which registered in the domain are authenticated in the Redmine through LDAP, as described here - LDAP Authentication
Some customers wants automatically login to Redmine, without typing credentials somewhere and immediately go to the home_url.
Is it possible?
I tried to use the hack as described here - Running redmine on Apache2 on Windows; using SSPI authentication; is it possible? - but I still should enter the AD credentials when passing the basic authentication (in a separate window).
How to configure silent login to Redmine upon entering to domain?
Just wrote a post of how to setup it on latest CentOS 7, using single_auth plugin: http://techutils.bcmedeiros.dev/2016/02/redmine-ad-sso-setup.html
The idea there is to follow the default setup of the single_auth plugin, but using the mod_auth_ntlm_winbind apache module to be the bridge between apache and the ntlm_auth command. ntlm_auth needs samba (in this case samba 4) to be joined in the domain.
Hope it helps!