Linux PAM Tutorial: Secure SSH Access Without Writing Code

🔐 Linux PAM Tutorial: Secure SSH Access with PAM (Limit Logins, Restrict Login Times & Allow Specific Users) Did you know you can significantly improve Linux server security without writing a single line of code? In this hands-on Linux security tutorial, you'll learn how to use PAM (Pluggable Authentication Modules) to harden SSH access by: ✅ Limiting the number of SSH login sessions per user ✅ Restricting SSH access to business hours only ✅ Allowing only specific users to SSH into the server ✅ Implementing enterprise-style access control policies ✅ Improving Linux server security with real-world PAM configurations These are practical Linux security techniques commonly used by Linux Administrators, System Engineers, DevOps Engineers, and Cloud Engineers in production environments. Whether you're preparing for Linux interviews, learning Linux administration, or hardening your servers, this PAM tutorial will give you real-world skills you can use immediately. ⏱️ TIMELINE 00:00 Introduction 00:53 Understanding PAM Configuration Files 02:09 Limit SSH Login Sessions with PAM 06:01 Remove SSH Session Limits 07:01 Restrict SSH Access by Time of Day 10:17 Create an SSH Allow List with PAM 14:46 PAM Security Features Recap 15:17 Final Thoughts & CTA 💻 COMMANDS USED IN THIS VIDEO View PAM configuration directory cd /etc/pam.d ls Edit SSH PAM configuration sudo vim /etc/pam.d/sshd Configure login limits sudo vim /etc/security/limits.conf Example: joe - maxlogins 1 Check active sessions who Test SSH login ssh [email protected] Enable login time restrictions account required pam_time.so Configure allowed login hours sudo vim /etc/security/time.conf Example: sshd;*;joe;Wk0800-1800 Allow only specific users to SSH auth required pam_listfile.so item=user sense=allow file=/etc/ssh/ssh.allow Create SSH allow list sudo vim /etc/ssh/ssh.allow Example: joe phuongho 🔗 RELATED ARTICLES & RESOURCES ►My Websit https://luuhophuong.com ► PAM Limits Configuration https://man7.org/linux/man-pages/man5... ► PAM Time Restrictions https://man7.org/linux/man-pages/man8... ► Linux Security Hardening Guide https://www.redhat.com/en/topics/linu... 🎯 WHO THIS VIDEO IS FOR • Linux Administrators • System Engineers • DevOps Engineers • Cloud Engineers • Linux Students • LPIC Learners • RHCSA / RHCE Candidates • Anyone interested in Linux Security #Linux#PAM#LinuxSecurity#SSHSecurity#LinuxAdministration#DevOps#CloudComputing#SystemAdministrator #LinuxTutorial#LinuxServer#CyberSecurity#RHCSA#RHCE#LPIC#DevOpsEngineer