From cd6f7994a9c5d6501ce56b57362c7f33f64fa3d5 Mon Sep 17 00:00:00 2001 From: Viacheslav Hletenko Date: Wed, 19 Jul 2023 14:39:45 +0000 Subject: sshguard: T5354: Add service ssh dynamic-protection Sshguard protects hosts from brute-force attacks It can inspect logs and block "bad" addresses by threshold Auto-generates own tables and rules for nftables, so they are not intercept with VyOS firewall rules. When service stops, all generated tables are deleted. set service ssh dynamic-protection set service ssh dynamic-protection allow-from '192.0.2.1' set service ssh dynamic-protection block-time '120' set service ssh dynamic-protection detect-time '1800' set service ssh dynamic-protection threshold '30' --- data/templates/ssh/sshguard_config.tmpl | 27 +++++++++++++++++++++++++++ data/templates/ssh/sshguard_whitelist.tmpl | 7 +++++++ 2 files changed, 34 insertions(+) create mode 100644 data/templates/ssh/sshguard_config.tmpl create mode 100644 data/templates/ssh/sshguard_whitelist.tmpl (limited to 'data/templates/ssh') diff --git a/data/templates/ssh/sshguard_config.tmpl b/data/templates/ssh/sshguard_config.tmpl new file mode 100644 index 000000000..fbcbac908 --- /dev/null +++ b/data/templates/ssh/sshguard_config.tmpl @@ -0,0 +1,27 @@ +### Autogenerated by ssh.py ### + +{% if dynamic_protection is defined and dynamic_protection is not none %} +# Full path to backend executable (required, no default) +BACKEND="/usr/lib/x86_64-linux-gnu/sshg-fw-nft-sets" + +# Shell command that provides logs on standard output. (optional, no default) +# Example 1: ssh and sendmail from systemd journal: +LOGREADER="LANG=C journalctl -afb -p info -n1 -t sshd -o cat" + +#### OPTIONS #### +# Block attackers when their cumulative attack score exceeds THRESHOLD. +# Most attacks have a score of 10. (optional, default 30) +THRESHOLD={{ dynamic_protection.threshold }} + +# Block attackers for initially BLOCK_TIME seconds after exceeding THRESHOLD. +# Subsequent blocks increase by a factor of 1.5. (optional, default 120) +BLOCK_TIME={{ dynamic_protection.block_time }} + +# Remember potential attackers for up to DETECTION_TIME seconds before +# resetting their score. (optional, default 1800) +DETECTION_TIME={{ dynamic_protection.detect_time }} + +# IP addresses listed in the WHITELIST_FILE are considered to be +# friendlies and will never be blocked. +WHITELIST_FILE=/etc/sshguard/whitelist +{% endif %} diff --git a/data/templates/ssh/sshguard_whitelist.tmpl b/data/templates/ssh/sshguard_whitelist.tmpl new file mode 100644 index 000000000..c972ec343 --- /dev/null +++ b/data/templates/ssh/sshguard_whitelist.tmpl @@ -0,0 +1,7 @@ +### Autogenerated by ssh.py ### + +{% if dynamic_protection.allow_from is defined and dynamic_protection.allow_from is not none %} +{% for address in dynamic_protection.allow_from %} +{{ address }} +{% endfor %} +{% endif %} -- cgit v1.2.3