check_ldap_ppolicy_lockout

Overview

This is Nagios plugin to check for LDAP accounts, which have been locked by the ppolicy overlay due to too many failed login attempts.

Installation

Best install the plugin in a virtual environment, e.g.:

python -m venv /usr/local/lib/check_ldap_ppolicy_lockout
. /usr/local/lib/check_ldap_ppolicy_lockout/bin/activate
pip install check_ldap_ppolicy_lockout
ln -s $(which check_ldap_ppolicy_lockout) /usr/lib/nagios/plugins/check_ldap_ppolicy_lockout

Configuration

Configuration is loaded from ~/.check_ldap_ppolicy_lockout.yaml or as fallback from /etc/check_ldap_ppolicy_lockout.yaml. This behaviour may be overruled via the -f command line option. The following parameters are supported with the defaults shown for the optional parameters:

alarms:
  warning: 1
  critical: 5
  expire_seconds: 600
ldap:
  uri: ldap://localhost  # Required
  binddn: cn=nagios,ou=services,dc=example,dc=com  # Required
  bindpw: xxx  # Required
  tls: true
  tls_ca_file: /etc/ssl/certs/ldap_ca.crt  # Required if ldap.tls is true
  users_base_dn: ou=users,dc=example,dc=com  # Required

Usage

usage: check_ldap_ppolicy_lockout [-h] [-f CONFIG_FILE] [-w WARNING] [-c CRITICAL] [-e EXPIRE_SECONDS]

Check for user accounts locked by LDAP ppolicy overlay

options:
  -h, --help            show this help message and exit
  -f, --config-file CONFIG_FILE
                        Path to configuration file
  -w, --warning WARNING
                        Number of locked users to trigger warning (Default 1).
  -c, --critical CRITICAL
                        Number of locked users to trigger critical alert (Default 5)
  -e, --expire-seconds EXPIRE_SECONDS
                        Seconds after which locks expire (Default 300 - should match your ppolicy lockout-time)```

## Remarks

For AD installations a plugin check_ldap_lockout seems to exist, see also:

* https://nagios.fm4dd.com/plugins/manual/check_ldap_lockout.shtm

A first check suggests that this plugin does not support TLS,
which does not allow an easy adaptation for modern setups.