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 joe@192.168.114.4

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/limits.conf.5.html

► PAM Time Restrictions
https://man7.org/linux/man-pages/man8/pam_time.8.html

► Linux Security Hardening Guide
https://www.redhat.com/en/topics/linux/what-is-linux-security

🎯 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

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