Locking accounts with a number of incorrect login attempts

This document (7012381) is provided subject to the disclaimer at the end of this document.

Environment


SUSE Linux Enterprise Server 11

Situation

When a user incorrectly enters a password several times and you want the account to lock for a certain amount of time.  This configuration does NOT work to lock the root account (although settings can be changed to include root in the locked accounts list.

Resolution

1. Edit the /etc/pam.d/common-auth file to include

auth required pam_tally2.so deny=2 unlock_time=300

auth required pam_env.so

auth sufficient pam_unix2.so

Where deny=<number of attempts before lockout>

Where unlock_time=<time in seconds for account to be locked>

2. Edit the /etc/pam.d/common-account to include

account required pam_tally2.so

account requisite pam_unix2.so

account sufficient pam_localuser.so

auth required pam_tally2.so

Additional Information

To check the users that have been locked out and the number of attempts run: pam_tally2

To unlock a specific account manually as root run

pam_tally2 --user=<username> --reset

For more information and other options check the man page of pam_tally2

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7012381
  • Creation Date: 08-May-2013
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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