I would recommend keycloak. I can basically do everything related to webapps authentication (OIDC, 2FA, etc)… except working as an LDAP/AD server, which typically used to enable login to physical machine using the network account. But, it has built-in LDAP provider support, which mean you can use OpenLDAP to host the accounts of your users (so they can use LDAP authentication on their own machine), and point keycloak to that OpenLDAP instance to allow your users to login to your webapps using their OpenLDAP account.