Install libapache2-mod-authnz-external by entering the following commands in the terminal:
sudo apt update sudo apt install libapache2-mod-authnz-external
Description:
authenticate Apache against external authentication services
Mod_Authnz_External can be used to quickly construct secure, reliable authentication systems. It can also be mis-used to quickly open gaping holes in your security. Read the documentation, and use with extreme caution. . Notably, this module can be used to securely authenticate against PAM (without exposing /etc/shadow file), using, for example, pwauth authenticator. . This Package includes the mod-authnz-external Module for Apache Version 2.x
Homepage: http://code.google.com/p/mod-auth-external
Version: 3.3.2-0.1
Section: universe/web