82 lines
3.3 KiB
Markdown
82 lines
3.3 KiB
Markdown
---
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title: Fail2ban Configuration
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description: Applies the system `fail2ban` jail configuration and then restarts the service
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sidebar_label: 31 Fail2ban Configuration
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slug: /scripts/after/run_onchange_after_31-fail2ban.sh.tmpl
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githubLocation: https://github.com/megabyte-labs/install.doctor/blob/master/home/.chezmoiscripts/universal/run_onchange_after_31-fail2ban.sh.tmpl
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scriptLocation: https://github.com/megabyte-labs/install.doctor/raw/master/home/.chezmoiscripts/universal/run_onchange_after_31-fail2ban.sh.tmpl
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repoLocation: home/.chezmoiscripts/universal/run_onchange_after_31-fail2ban.sh.tmpl
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---
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# Fail2ban Configuration
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Applies the system `fail2ban` jail configuration and then restarts the service
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## Overview
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Fail2ban is an SSH security program that temporarily bans IP addresses that could possibly be
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attempting to gain unauthorized system access. This script applies the "jail" configuration
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located at `home/private_dot_ssh/fail2ban/` to the system location. It then enables and restarts
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the `fail2ban` configuration.
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## Links
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* [`fail2ban` configuration folder](https://github.com/megabyte-labs/install.doctor/tree/master/home/private_dot_ssh/fail2ban)
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## Source Code
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```
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{{- if eq .host.distro.family "linux" -}}
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#!/usr/bin/env bash
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# @file Fail2ban Configuration
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# @brief Applies the system `fail2ban` jail configuration and then restarts the service
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# @description
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# Fail2ban is an SSH security program that temporarily bans IP addresses that could possibly be
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# attempting to gain unauthorized system access. This script applies the "jail" configuration
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# located at `home/private_dot_ssh/fail2ban/` to the system location. It then enables and restarts
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# the `fail2ban` configuration.
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#
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# ## Links
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#
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# * [`fail2ban` configuration folder](https://github.com/megabyte-labs/install.doctor/tree/master/home/private_dot_ssh/fail2ban)
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# jail.local hash: {{- include (joinPath .host.home ".ssh" "fail2ban" "jail.local") | sha256sum -}}
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{{ includeTemplate "universal/profile" }}
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{{ includeTemplate "universal/logg" }}
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### Restart fail2ban
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function restartFail2Ban() {
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if [ -d /Applications ] && [ -d /System ]; then
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# macOS
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logg info 'Enabling the `fail2ban` Homebrew service'
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brew services start fail2ban
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else
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# Linux
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logg info 'Enabling the `fail2ban` service'
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sudo systemctl enable fail2ban
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logg info 'Restarting the `fail2ban` service'
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sudo systemctl restart fail2ban
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fi
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}
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### Update the jail.local file if environment is not WSL
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if [[ ! "$(test -d /proc && grep Microsoft /proc/version > /dev/null)" ]]; then
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if [ -d /etc/fail2ban ]; then
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logg info 'Copying ~/.ssh/fail2ban/jail.local to /etc/fail2ban/jail.local'
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sudo cp -f "$HOME/.ssh/fail2ban/jail.local" /etc/fail2ban/jail.local
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restartFail2Ban
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elif [ -d /usr/local/etc/fail2ban ]; then
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logg info 'Copying ~/.ssh/fail2ban/jail.local to /usr/local/etc/fail2ban/jail.local'
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sudo cp -f "$HOME/.ssh/fail2ban/jail.local" /usr/local/etc/fail2ban/jail.local
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restartFail2Ban
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else
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logg warn 'Both the /etc/fail2ban (Linux) and the /usr/local/etc/fail2ban (macOS) folder do not exist'
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fi
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else
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logg info 'Skipping sshd_config application since environment is WSL'
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fi
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{{ end -}}
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```
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