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With Protectimus multi-factor authentication (MFA) solution, you can set up CentOS two-factor authentication (2FA) in a few steps.

1. How CentOS Two-Factor Authentication (2FA) Works

After you enable CentOS 2FA, your users will need to use two authentication passwords to get access to their CentOS accounts:

1. The first is a standard password (something the user keeps in memory);
2. The second is a one-time password valid only for 30 or 60 seconds (the one-time password is generated with the help of a hardware OTP token or a 2FA app on a user’s phone – something that the user owns and has to carry with them).

This way, the CentOS account becomes protected with two different authentication factors. Even if the hacker steals the users’s password using phishing, brute force, social engineering, data spoofing, or any other attack, they can’t access the CentOS account without the one-time password from a user’s 2FA token.

This guide shows how you can set up CentOS two-factor authentication (2FA) using Protectimus RADIUS 2FA component for the integration with Protectimus Cloud 2FA service or Protectimus On-Premise MFA Platform.

2. How to Enable CentOS Two-Factor Authentication (2FA)

You can set up CentOS two-factor authentication (2FA) with Protectimus using the RADIUS protocol:

1. Get registered with Protectimus SAAS 2FA Service or On-Premise 2FA Platform and configure basic settings.
2. Install Protectimus PAM module for CentOS 2FA
3. Install and configure Protectimus RADIUS Server module.

2.1. Get Registered and Configure Basic Protectimus Settings

1. Register with the Protectimus Cloud Service and activate API or install the Protectimus On-Premise Platform (if you install Protectimus Platform on Windows, check the RProxy box during the installation).
2. Add Resource.
3. Add Users.
4. Add Tokens or activate Users’ Self Service Portal.
5. Assign Tokens to Users.
6. Assign Tokens with Users to the Resource.

2.2. Install Protectimus PAM module for CentOS 2FA

yum -y install epel-release yum -y install pam_radius

2.3. Install and configure Protectimus RADIUS Server

1. Install protectimus-radius

git clone https://github.com/protectimus/platform-linux.git cd platform-linux/radius edit config/radius.yml docker compose up -d

2. Configure radius.yml file.

   Configure Protectimus RADIUS Server settings in the radius.yml file. It must be located in the same directory as the executable.

   You will find detailed instructions on available properties that you can add to the radius.yml file in our Protectimus RADIUS Server Configuration Guide.

   The example of radius.yml file configuration:

radius: secret: secret auth-port: 1812 auth: # Could be : # - LDAP # - PROTECTIMUS_PASSWORD # - PROTECTIMUS_OTP # - PROTECTIMUS_PUSH providers: - PROTECTIMUS_OTP protectimus-api: login: login@domain.com api-key: aslkjdljsdlaskmWpXjT5K0xqLXkd3 url: https://api.protectimus.com/ resource-name: radius resource-id: 723

3. Edit pam_radius config, configure secret /etc/pam_radius.conf

# server[:port] shared_secret timeout (s) 127.0.0.1 secret 1

4. Configure SSH to use challenge response /etc/ssh/sshd_config

ChallengeResponseAuthentication yes

5. Execute the command systemctl restart sshd

6. Configure PAM for SSH to use RADIUS

   Add auth required pam_radius_auth.so after auth substack password-auth into /etc/pam.d/sshd

#%PAM-1.0 auth required pam_sepermit.so # protectimus pam radius auth substack password-auth auth required pam_radius_auth.so auth include postlogin # Used with polkit to reauthorize users in remote sessions -auth optional pam_reauthorize.so prepare CentOS multi-factor authentication setup is now complete. If you have other questions, contact our customer support service.