76 lines
2.0 KiB
Plaintext
76 lines
2.0 KiB
Plaintext
#####
|
|
*nat
|
|
#####
|
|
|
|
:PREROUTING ACCEPT [0:0]
|
|
:INPUT ACCEPT [0:0]
|
|
:OUTPUT ACCEPT [0:0]
|
|
:POSTROUTING ACCEPT [0:0]
|
|
|
|
# Remove all rules from all chains,
|
|
# delete all user-defined chains.
|
|
-F
|
|
-X
|
|
|
|
{{ iptables__v4_nat }}
|
|
|
|
COMMIT
|
|
|
|
########
|
|
*filter
|
|
########
|
|
|
|
:INPUT {{ 'DROP' if iptables__drop_by_default else 'ACCEPT' }} [0:0]
|
|
:FORWARD DROP [0:0]
|
|
:OUTPUT {{ 'DROP' if iptables__drop_by_default else 'ACCEPT' }} [0:0]
|
|
|
|
# Remove all rules from all chains,
|
|
# delete all user-defined chains.
|
|
-F
|
|
-X
|
|
|
|
{{ iptables__v4_filter_init }}
|
|
{{ iptables__all_filter_init }}
|
|
|
|
{{ iptables__v4_filter_prepend }}
|
|
{{ iptables__all_filter_prepend }}
|
|
|
|
# Allow all loopback (lo) traffic and reject anything
|
|
# to localhost that does not originate from lo.
|
|
-A INPUT -i lo -j ACCEPT
|
|
-A INPUT ! -i lo -s 127.0.0.0/8 -j REJECT
|
|
-A OUTPUT -o lo -j ACCEPT
|
|
|
|
# Allow all outgoing traffic.
|
|
{% if iptables__allow_output_ifaces %}
|
|
{% for iface in iptables__allow_output_ifaces %}
|
|
-A OUTPUT -o {{ iface }} -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
|
|
-A INPUT -i {{ iface }} -m conntrack --ctstate ESTABLISHED -j ACCEPT
|
|
{% endfor %}
|
|
{% else %}
|
|
-A OUTPUT -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
|
|
-A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
|
|
{% endif %}
|
|
|
|
# Allow some important ICMP.
|
|
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT
|
|
-A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT
|
|
-A INPUT -p icmp --icmp-type echo-reply -j ACCEPT
|
|
-A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
|
|
-A INPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT
|
|
-A OUTPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT
|
|
-A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
|
|
-A OUTPUT -p icmp --icmp-type time-exceeded -j ACCEPT
|
|
|
|
# Deny other ICMP.
|
|
-A INPUT -p icmp -j DROP
|
|
-A OUTPUT -p icmp -j DROP
|
|
|
|
# Allow incoming SSH.
|
|
-A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
|
|
-A OUTPUT -p tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
|
|
|
|
{{ iptables__v4_filter_append }}
|
|
|
|
COMMIT
|