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Update firewall scripts.

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This commit is contained in:
Darren 'Tadgy' Austin 2021-03-12 20:52:08 +00:00
commit 592a06bc02
5 changed files with 189 additions and 61 deletions
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23
sample-rc.d/rc.firewall-guests
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@ -3,12 +3,9 @@
# The name of the main external interface.
EX_IF="eth0"
# The name of the Private network interface.
PRI_IF="eth1"
# The IP ranges from where to accept unfiltered connections.
UNFILTERED_RANGES_V4=('91.109.244.7-91.109.244.11' '91.109.244.78-91.109.244.79' '91.109.244.239-91.109.244.243' '185.176.90.169')
UNFILTERED_RANGES_V6=('2a02:2498:1:227::/64' '2a07:4580:b0d:57f::/64')
UNFILTERED_RANGES_V4=('212.78.94.73' '216.119.155.58-216.119.155.62' '91.109.244.7-91.109.244.11' '185.176.90.169')
UNFILTERED_RANGES_V6=('2a02:2498:e004:2a::/64' '2a02:2498:1:227::/64' '2a07:4580:b0d:57f::/64')
start_firewall() {
@ -35,14 +32,6 @@ start_firewall() {
iptables -t mangle -X
ip6tables -t mangle -X
# Allow all loopback traffic.
iptables -A INPUT -i lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
# Allow all Private network traffic.
iptables -A INPUT -i "$PRI_IF" -j ACCEPT
ip6tables -A INPUT -i "$PRI_IF" -j ACCEPT
# Drop invalid packets on all interfaces.
iptables -A INPUT -m conntrack --ctstate INVALID -j DROP
ip6tables -A INPUT -m conntrack --ctstate INVALID -j DROP
@ -54,6 +43,10 @@ start_firewall() {
iptables -A INPUT -i "$EX_IF" -s 172.16.0.0/12 -j DROP
iptables -A INPUT -i "$EX_IF" -s 192.168.0.0/16 -j DROP
# Allow all loopback traffic.
iptables -A INPUT -i lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
# Allow unrestricted access from our IPs.
for IPRANGE in "${UNFILTERED_RANGES_V4[@]}"; do
iptables -A INPUT -i "$EX_IF" -m iprange --src-range "$IPRANGE" -j ACCEPT
@ -83,9 +76,7 @@ start_firewall() {
ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type neighbour-solicitation -j ACCEPT
ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type neighbour-advertisement -j ACCEPT
# Always allow SSH.
# Note: We never want to be locked out of the system, so also accept on the standard ssh port, just in case things accidently get
# set back to defaults. Any connections to the standard port will just get a 'connection refused' message, unless this happens.
# Allow SSH.
iptables -A INPUT -i "$EX_IF" -p tcp --syn -m multiport --dports 22,9922 -m conntrack --ctstate NEW -j ACCEPT
ip6tables -A INPUT -i "$EX_IF" -p tcp --syn -m multiport --dports 22,9922 -m conntrack --ctstate NEW -j ACCEPT