Checkmk Werk 14976: Add SAML Authentication to Checkmk UI

ID: 14976 Title: Add SAML Authentication to Checkmk UI Component: setup Level: 1 Class: New feature Version: 2.2.0i1 SAML authentication is now integrated with the Checkmk UI. The initial feature set includes the following: LI: Single sign-on (HTTP POST binding/front channel communication) LI: Setup page to configure one or more SAML connections: Setup -> Users -> SAML Authentication LI: Automatic user creation and user attribute synchronization at login time LI: Signing of requests and signature verification of responses. Supported algorithms: SHA256, SHA384, SHA512 LI: Logging to $OMD_ROOT/var/log/web.log for administrative and debugging purposes LI: Option to log in with username and password for non-SAML users (htpasswd/LDAP) With this change, we also deprecate the previous SAML integration approach on Apache level based on mod_auth_mellon. Support will be dropped with Checkmk version 2.3.0. If you would still like to use this approach in version 2.3.0 and beyond, mod_auth_mellon will need to be installed.