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Standardize iptables comments

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This commit is contained in:
Ryan Cavicchioni 2019-08-27 06:08:19 +00:00
parent 39b526a6a4
commit dfeed33f2b
Signed by: ryanc
GPG Key ID: 877EEDAF9245103D
3 changed files with 51 additions and 45 deletions
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2
roles/firewall/defaults/main.yaml
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@ -26,6 +26,8 @@ firewall_iptables_output_policy_v6: ACCEPT
firewall_iptables_forward_policy_v6: DROP firewall_iptables_forward_policy_v6: DROP
firewall_drop_icmp_flood: true firewall_drop_icmp_flood: true
firewall_limit_icmp_flood_seconds: 1
firewall_limit_icmp_flood_hitcount: 6
firewall_limited_tcp_ports: {} firewall_limited_tcp_ports: {}

76
roles/firewall/templates/ip6tables.j2
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@ -9,88 +9,90 @@
-N LOG_DROP -N LOG_DROP
-A LOG_DROP -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables DROP] " --log-level info -A LOG_DROP -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables DROP] " --log-level info
-A LOG_DROP -p tcp -m tcp -m comment --comment "reject tcp" -j REJECT --reject-with tcp-reset -A LOG_DROP -p tcp -m tcp -m comment --comment "reject tcp6" -j REJECT --reject-with tcp-reset
-A LOG_DROP -p udp -m udp -m comment --comment "drop udp" -j DROP -A LOG_DROP -p udp -m udp -m comment --comment "drop udp6" -j DROP
-A LOG_DROP -m comment --comment "reject all" -j REJECT --reject-with icmp6-adm-prohibited -A LOG_DROP -m comment --comment "reject all inet6" -j REJECT --reject-with icmp6-adm-prohibited
{% if firewall_limit_ssh %} {% if firewall_limit_ssh %}
-N LIMIT_SSH -N LIMIT_SSH
-A LIMIT_SSH -m recent --set --name SSH --rsource -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 -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 v6" -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 -m comment --comment "rate limit ssh 22/tcp6" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -j ACCEPT -A LIMIT_SSH -j ACCEPT
{% endif %} {% endif %}
{% if firewall_drop_icmp_flood %} {% if firewall_drop_icmp_flood %}
-N ICMP_FLOOD -N ICMP_FLOOD
-A ICMP_FLOOD -m recent --set --name ICMP --rsource -A ICMP_FLOOD -m recent --set --name ICMP --rsource
-A ICMP_FLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables ICMP FLOOD] " --log-level info -A ICMP_FLOOD -m recent --update --seconds {{ firewall_limit_icmp_flood_seconds }} --hitcount {{ firewall_limit_icmp_flood_hitcount }} --name ICMP --rsource --rttl -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables ICMP FLOOD] " --log-level info
-A ICMP_FLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m comment --comment "drop icmp flood v6" -j REJECT --reject-with icmp6-adm-prohibited -A ICMP_FLOOD -m recent --update --seconds {{ firewall_limit_icmp_flood_seconds }} --hitcount {{ firewall_limit_icmp_flood_hitcount }} --name ICMP --rsource --rttl -m comment --comment "drop icmpv6 flood" -j REJECT --reject-with icmp6-adm-prohibited
-A ICMP_FLOOD -j ACCEPT -A ICMP_FLOOD -j ACCEPT
{% endif %} {% endif %}
-A INPUT -i lo -m comment --comment "lo accept all" -j ACCEPT -A INPUT -i lo -m comment --comment "lo accept all inet6" -j ACCEPT
-A INPUT -m state --state INVALID -m comment --comment "drop invalid IPv6" -j DROP -A INPUT -m state --state INVALID -m comment --comment "drop invalid inet6" -j DROP
{% if firewall_ipset_mgmt.v6 is defined %} {% if firewall_ipset_mgmt.v6 is defined %}
-A INPUT -p tcp -m tcp --dport 22 -m set --match-set mgmt_v6 src -m comment --comment "accept mgmt ssh" -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -m set --match-set mgmt_v6 src -m comment --comment "accept mgmt ssh 22/tcp6" -j ACCEPT
{% endif %} {% endif %}
{% if firewall_ipset_blacklist.v6 is defined %} {% if firewall_ipset_blacklist.v6 is defined %}
-A INPUT -m set --match-set mgmt_v6 src -m comment --comment "drop blacklist" -j LOG_DROP -A INPUT -m set --match-set mgmt_v6 src -m comment --comment "drop blacklist inet6" -j LOG_DROP
{% endif %} {% endif %}
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 130 -m comment --comment "accept icmp 130" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 130 -m comment --comment "accept icmpv6 130" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 131 -m comment --comment "accept icmp 131" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 131 -m comment --comment "accept icmpv6 131" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 132 -m comment --comment "accept icmp 132" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 132 -m comment --comment "accept icmpv6 132" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 143 -m comment --comment "accept icmp 143" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 143 -m comment --comment "accept icmpv6 143" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 151 -m hl --hl-eq 1 -m comment --comment "accept icmp 151" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 151 -m hl --hl-eq 1 -m comment --comment "accept icmpv6 151" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 152 -m hl --hl-eq 1 -m comment --comment "accept icmp 152" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 152 -m hl --hl-eq 1 -m comment --comment "accept icmpv6 152" -j ACCEPT
-A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 153 -m hl --hl-eq 1 -m comment --comment "accept icmp 153" -j ACCEPT -A INPUT -s fe80::/10 -p icmpv6 -m icmpv6 --icmpv6-type 153 -m hl --hl-eq 1 -m comment --comment "accept icmpv6 153" -j ACCEPT
-A INPUT -s fe80::/10 -p udp -m udp --sport 547 --dport 546 -m comment --comment "accept dhcpv6" -j ACCEPT -A INPUT -s fe80::/10 -p udp -m udp --sport 547 --dport 546 -m comment --comment "accept dhcpv6" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type destination-unreachable -m comment --comment "accept icmp destination-unreachable" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type destination-unreachable -m comment --comment "accept icmpv6 destination-unreachable" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type packet-too-big -m comment --comment "accept icmp packet-too-big" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type packet-too-big -m comment --comment "accept icmpv6 packet-too-big" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type time-exceeded -m comment --comment "accept icmp time-exceeded" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type time-exceeded -m comment --comment "accept icmpv6 time-exceeded" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type parameter-problem -m comment --comment "accept icmp parameter-problem" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type parameter-problem -m comment --comment "accept icmpv6 parameter-problem" -j ACCEPT
{% if firewall_drop_icmp_flood %} {% if firewall_drop_icmp_flood %}
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-request -m comment --comment "accept icmpv6 echo-request" -j ICMP_FLOOD -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-request -m comment --comment "accept icmpv6 echo-request" -j ICMP_FLOOD
{% else %} {% else %}
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-request -m comment --comment "accept icmpv6 echo-request" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-request -m comment --comment "accept icmpv6 echo-request" -j ACCEPT
{% endif %} {% endif %}
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-reply -m comment --comment "accept icmp echo-reply" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type echo-reply -m comment --comment "accept icmpv6 echo-reply" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type router-solicitation -m hl --hl-eq 255 -m comment --comment "accept icmp router-solicitation" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type router-solicitation -m hl --hl-eq 255 -m comment --comment "accept icmpv6 router-solicitation" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type router-advertisement -m hl --hl-eq 255 -m comment --comment "accept icmp router-advertisement" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type router-advertisement -m hl --hl-eq 255 -m comment --comment "accept icmpv6 router-advertisement" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type neighbour-solicitation -m hl --hl-eq 255 -m comment --comment "accept icmp neighbour-solicitation" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type neighbour-solicitation -m hl --hl-eq 255 -m comment --comment "accept icmpv6 neighbour-solicitation" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type neighbour-advertisement -m hl --hl-eq 255 -m comment --comment "accept icmp neighbour-advertisement" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type neighbour-advertisement -m hl --hl-eq 255 -m comment --comment "accept icmpv6 neighbour-advertisement" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 141 -m hl --hl-eq 255 -m comment --comment "accept icmp 141" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 141 -m hl --hl-eq 255 -m comment --comment "accept icmpv6 141" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 142 -m hl --hl-eq 255 -m comment --comment "accept icmp 142" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 142 -m hl --hl-eq 255 -m comment --comment "accept icmpv6 142" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 148 -m hl --hl-eq 255 -m comment --comment "accept icmp 148" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 148 -m hl --hl-eq 255 -m comment --comment "accept icmpv6 148" -j ACCEPT
-A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 149 -m hl --hl-eq 255 -m comment --comment "accept icmp 149" -j ACCEPT -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 149 -m hl --hl-eq 255 -m comment --comment "accept icmpv6 149" -j ACCEPT
{% if firewall_ipset_bogons.v6 is defined %} {% if firewall_ipset_bogons.v6 is defined %}
-A INPUT -i {{ firewall_bogon_interface }} -m set --match-set bogons_v6 src,dst -m comment --comment "drop bogons" -j LOG_DROP -A INPUT -i {{ firewall_bogon_interface }} -m set --match-set bogons_v6 src,dst -m comment --comment "drop bogons inet6" -j LOG_DROP
{% endif %} {% endif %}
{% if firewall_limit_ssh %} {% if firewall_limit_ssh %}
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh" -j LIMIT_SSH -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh 22/tcp6" -j LIMIT_SSH
{% else %} {% else %}
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh" -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh 22/tcp6" -j ACCEPT
{% endif %} {% endif %}
{% for port in firewall_allowed_tcp_ports.v6 | default([]) %} {% for port in firewall_allowed_tcp_ports.v6 | default([]) %}
-A INPUT -p tcp -m tcp --dport {{ port }} -m comment --comment "accept {{ port }}/tcp" -j ACCEPT -A INPUT -p tcp -m tcp --dport {{ port }} -m comment --comment "accept {{ port }}/tcp6" -j ACCEPT
{% endfor %} {% endfor %}
{% for port in firewall_allowed_udp_ports.v6 | default([]) %} {% for port in firewall_allowed_udp_ports.v6 | default([]) %}
-A INPUT -p udp -m udp --dport {{ port }} -m comment --comment "accept {{ port }}/udp" -j ACCEPT -A INPUT -p udp -m udp --dport {{ port }} -m comment --comment "accept {{ port }}/udp6" -j ACCEPT
{% endfor %} {% endfor %}
-A INPUT -m state --state RELATED,ESTABLISHED -m comment --comment "accept related/established" -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -m comment --comment "accept related/established inet6" -j ACCEPT
-A INPUT -m comment --comment "log drop" -j LOG_DROP -A INPUT -m comment --comment "default drop inet6" -j LOG_DROP
COMMIT COMMIT
# vim: tw=0

18
roles/firewall/templates/iptables.j2
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@ -17,24 +17,24 @@
-N LIMIT_SSH -N LIMIT_SSH
-A LIMIT_SSH -m recent --set --name SSH --rsource -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 -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 v4" -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 -m comment --comment "rate limit ssh 22/tcp" -j REJECT --reject-with tcp-reset
-A LIMIT_SSH -j ACCEPT -A LIMIT_SSH -j ACCEPT
{% endif %} {% endif %}
{% if firewall_drop_icmp_flood %} {% if firewall_drop_icmp_flood %}
-N ICMP_FLOOD -N ICMP_FLOOD
-A ICMP_FLOOD -m recent --set --name ICMP --rsource -A ICMP_FLOOD -m recent --set --name ICMP --rsource
-A ICMP_FLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables ICMP FLOOD] " --log-level info -A ICMP_FLOOD -m recent --update --seconds {{ firewall_limit_icmp_flood_seconds }} --hitcount {{ firewall_limit_icmp_flood_hitcount }} --name ICMP --rsource --rttl -m limit --limit {{ firewall_log_limit }} --limit-burst {{ firewall_log_limit_burst }} -j LOG --log-prefix "[iptables ICMP FLOOD] " --log-level info
-A ICMP_FLOOD -m recent --update --seconds 1 --hitcount 6 --name ICMP --rsource --rttl -m comment --comment "drop icmp flood v4" -j REJECT --reject-with icmp-admin-prohibited -A ICMP_FLOOD -m recent --update --seconds {{ firewall_limit_icmp_flood_seconds }} --hitcount {{ firewall_limit_icmp_flood_hitcount }} --name ICMP --rsource --rttl -m comment --comment "drop icmp flood" -j REJECT --reject-with icmp-admin-prohibited
-A ICMP_FLOOD -j ACCEPT -A ICMP_FLOOD -j ACCEPT
{% endif %} {% endif %}
-A INPUT -i lo -m comment --comment "lo accept all" -j ACCEPT -A INPUT -i lo -m comment --comment "lo accept all" -j ACCEPT
-A INPUT -m state --state INVALID -m comment --comment "drop invalid IPv4" -j DROP -A INPUT -m state --state INVALID -m comment --comment "drop invalid" -j DROP
{% if firewall_ipset_mgmt.v4 is defined %} {% if firewall_ipset_mgmt.v4 is defined %}
-A INPUT -p tcp -m tcp --dport 22 -m set --match-set mgmt_v4 src -m comment --comment "accept mgmt ssh" -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -m set --match-set mgmt_v4 src -m comment --comment "accept mgmt ssh 22/tcp" -j ACCEPT
{% endif %} {% endif %}
{% if firewall_ipset_blacklist.v4 is defined %} {% if firewall_ipset_blacklist.v4 is defined %}
@ -60,9 +60,9 @@
{% endfor %} {% endfor %}
{% if firewall_limit_ssh %} {% if firewall_limit_ssh %}
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh" -j LIMIT_SSH -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh 22/tcp" -j LIMIT_SSH
{% else %} {% else %}
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh" -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m comment --comment "accept ssh 22/tcp" -j ACCEPT
{% endif %} {% endif %}
{% for port in firewall_allowed_tcp_ports.v4 | default([]) %} {% for port in firewall_allowed_tcp_ports.v4 | default([]) %}
@ -75,6 +75,8 @@
-A INPUT -m state --state RELATED,ESTABLISHED -m comment --comment "accept related/established" -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -m comment --comment "accept related/established" -j ACCEPT
-A INPUT -m comment --comment "log drop" -j LOG_DROP -A INPUT -m comment --comment "default drop" -j LOG_DROP
COMMIT COMMIT
# vim: tw=0