![]() auth required pam_faillock.so preauth silent audit deny=3 even_deny_root unlock_time=1200Īuth pam_faillock.so authfail audit deny=3 even_deny_root unlock_time=3600 In this example, the unlock time for regular users is 1200 seconds (20 minutes) and 3600 seconds (60 min or 1 hr) for the root user after 3 failed SSH login attempts. You can add the even_deny_root parameter to auth section to lock out both the user as well as the normal user. Configure pam_faillock in PAM How to Lock Root After Failed SSH Logins account required pam_faillock.soĪfter adding the above settings, it should appear as follows. Next, navigate to the account section and add the following line in both of the above files. ![]() # User changes will be destroyed the next time authselect is run.Īuth sufficient pam_unix.so try_first_pass nullokĪuth required pam_faillock.so preauth silent audit deny=3 unlock_time=1200 The auth section in both files should have the content below arranged in this order: #%PAM-1.0 Note that the order of these lines is very important, wrong configurations can cause all user accounts to be locked. unlock_time – sets the time ( 600 seconds = 10 minutes) for which the account should remain locked.deny – used to define the number of attempts ( 3 in this case), after which the user account should be locked.auth required pam_faillock.so preauth silent audit deny=3 unlock_time=1200Īuth pam_faillock.so authfail audit deny=3 unlock_time=600 To lock out or deny users access to the system after 3 unsuccessful SSH attempts and unlock the user account after 1200 seconds, add the following lines in the auth section. You can configure the above functionality in the /etc/pam.d/system-auth and /etc/pam.d/password-auth files, by adding the entries below to the auth section. It offers more flexibility and options than the two modules. The pam_faillock module replaces the pam_tally and pam_tally2 modules which have been deprecated in RHEL 7 and RHEL 8. Failed login attempts are stored in per-user files in the tally directory which is /var/run/faillock/ by default. The module records failed authentication attempts per user and temporarily locks the user account if the failed authentication attempts exceed a certain limit. We briefly explained configuring PAM to audit user login shell activity. It accepts authentication checks from programs such as sshd, gdm, login, and many more and authenticates the user to those services or applications in Linux systems.
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