How to Automate SSH Two-Factor Authentication Using Google Authenticator

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Relying on SSH keys or passwords alone leaves servers vulnerable, as a compromised workstation can expose all access credentials. Adding Two-Factor Authentication (2FA) via Time-based One-Time Passwords (TOTP) through Google Authenticator significantly strengthens server security. However, manually configuring the pam_google_authenticator module across many servers creates operational overhead, inconsistency, and risk of misconfiguration. Automating the process involves installing the libpam-google-authenticator package, modifying PAM and SSH daemon configuration files, and carefully managing per-user secret files with correct permissions. The guide covers setup steps for both Debian/Ubuntu and CentOS/RHEL systems, along with strategies to enforce or gradually roll out 2FA across infrastructure.

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