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Use ipsets for cool off period

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This commit is contained in:
Ryan Cavicchioni 2019-08-30 02:34:58 +00:00
parent 41c2343f75
commit a44a6540ba
Signed by: ryanc
GPG Key ID: 877EEDAF9245103D
5 changed files with 14 additions and 6 deletions
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2
roles/firewall/defaults/main.yaml
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@ -46,6 +46,8 @@ firewall_limit_ssh_hitcount: 10
firewall_bogon_interface: "{{ ansible_default_ipv4.interface }}"
# ipset's
firewall_ipset_scanner_timeout: 600
firewall_ipset_blacklist: {}
firewall_ipset_mgmt: {}

3
roles/firewall/templates/ip6tables.j2
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@ -17,7 +17,8 @@
-N LIMIT_SSH
-A LIMIT_SSH -m recent --set --name SSH --rsource
-A LIMIT_SSH -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount }} --name SSH --rsource -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables SSH BRUTE] " --log-level info
-A LIMIT_SSH -p tcp -m tcp -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount}} --name SSH --rsource -m comment --comment "rate limit ssh 22/tcp6" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -p tcp -m tcp -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount }} --name SSH --rsource -j SET --add-set cooloff_v6 src
-A LIMIT_SSH -p tcp -m tcp -m set --match-set cooloff_v6 src -m comment --comment "rate limit ssh 22/tcp" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -j ACCEPT
{% endif %}

6
roles/firewall/templates/ipset.v4.j2
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@ -1,5 +1,5 @@
{% macro render_ipset(ipset, name, type="hash:net", family="inet") %}
create {{ name }} {{ type | default('hash:net') }} family {{ family }} counters -exist
{% macro render_ipset(ipset, name, type="hash:net", family="inet", timeout=None) %}
create {{ name }} {{ type | default('hash:net') }} family {{ family }} counters {% if timeout %}timeout {{ timeout }}{% endif %} -exist
flush {{ name }}
{% for ip_or_net in ipset | default([]) %}
add {{ name }} {{ ip_or_net }}
@ -11,3 +11,5 @@ add {{ name }} {{ ip_or_net }}
{{ render_ipset(firewall_ipset_blacklist.v4, 'blacklist_v4') }}
{{ render_ipset(firewall_ipset_bogons.v4, 'bogons_v4') }}
{{ render_ipset([], 'cooloff_v4', type="hash:ip", timeout=firewall_ipset_scanner_timeout) }}

6
roles/firewall/templates/ipset.v6.j2
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@ -1,5 +1,5 @@
{% macro render_ipset(ipset, name, type="hash:net", family="inet6") %}
create {{ name }} {{ type | default('hash:net') }} family {{ family }} counters -exist
{% macro render_ipset(ipset, name, type="hash:net", family="inet6", timeout=None) %}
create {{ name }} {{ type | default('hash:net') }} family {{ family }} counters {% if timeout %}timeout {{ timeout }}{% endif %} -exist
flush {{ name }}
{% for ip_or_net in ipset | default([]) %}
add {{ name }} {{ ip_or_net }}
@ -11,3 +11,5 @@ add {{ name }} {{ ip_or_net }}
{{ render_ipset(firewall_ipset_blacklist.v6, 'blacklist_v6') }}
{{ render_ipset(firewall_ipset_bogons.v6, 'bogons_v6') }}
{{ render_ipset([], 'cooloff_v6', type="hash:ip", timeout=firewall_ipset_scanner_timeout) }}

3
roles/firewall/templates/iptables.j2
View File

@ -17,7 +17,8 @@
-N LIMIT_SSH
-A LIMIT_SSH -m recent --set --name SSH --rsource
-A LIMIT_SSH -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount }} --name SSH --rsource -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables SSH BRUTE] " --log-level info
-A LIMIT_SSH -p tcp -m tcp -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount }} --name SSH --rsource -m comment --comment "rate limit ssh 22/tcp" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -p tcp -m tcp -m recent --update --seconds {{ firewall_limit_ssh_seconds }} --hitcount {{ firewall_limit_ssh_hitcount }} --name SSH --rsource -j SET --add-set cooloff_v4 src
-A LIMIT_SSH -p tcp -m tcp -m set --match-set cooloff_v4 src -m comment --comment "rate limit ssh 22/tcp" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -j ACCEPT
{% endif %}