How To Install pam_2fa on CentOS 8

pam_2fa is Second factor authentication for PAM

Introduction

In this tutorial we learn how to install pam_2fa on CentOS 8.

What is `pam_2fa`

The PAM 2FA module provides a second factor authentication, which can be combined with the standard PAM-based password authentication to ask for * What you know * What you have (pick one of) * A Google Authenticator Application on your phone * A Phone Number capable of receiving SMS * A Yubikey

We can use yum or dnf to install pam_2fa on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install pam_2fa.

Install pam_2fa on CentOS 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install pam_2fa using dnf by running the following command:

sudo dnf -y install pam_2fa

Install pam_2fa on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install pam_2fa using yum by running the following command:

sudo yum -y install pam_2fa

How To Uninstall pam_2fa on CentOS 8

To uninstall only the pam_2fa package we can use the following command:

sudo dnf remove pam_2fa

pam_2fa Package Contents on CentOS 8

/lib64/security/pam_2fa.so
/usr/lib/.build-id
/usr/lib/.build-id/b4
/usr/lib/.build-id/b4/41dfc8111a75f8da4a29c2c6429c011dc73366
/usr/share/doc/pam_2fa
/usr/share/doc/pam_2fa/README.md
/usr/share/licenses/pam_2fa
/usr/share/licenses/pam_2fa/COPYING

References

pam_2fa website

Summary

In this tutorial we learn how to install pam_2fa on CentOS 8 using yum and dnf.