pam
pluggable Authentication Modules
TLDR
Check PAM configuration
$ pam-auth-update
Test PAM authentication$ pamtester [service] [user] authenticate
View PAM config$ cat /etc/pam.d/[service]
Debug PAM$ pam-auth-update --package
SYNOPSIS
pam modules configured in /etc/pam.d/
DESCRIPTION
PAM is Pluggable Authentication Modules. Framework for system authentication.The system provides flexible authentication. Configured per-service.
PARAMETERS
Configuration files in /etc/pam.d/:auth
Authentication token verification.account
Account validation.password
Password update.session
Session setup/teardown.
INSTALL
sudo dnf install pam
sudo pacman -S pam
sudo zypper install pam
nix profile install nixpkgs#pam
CAVEATS
Critical system component. Misconfiguration can lock out users. Test carefully.
HISTORY
PAM was developed by Sun Microsystems as a pluggable authentication framework.