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Block bad ip ranges

This commit is contained in:
Bob Mottram 2017-03-31 15:27:09 +01:00
parent bd1df3f79f
commit 425a4fc132
2 changed files with 46 additions and 0 deletions
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43
src/freedombone-utils-firewall
View File

@ -44,6 +44,49 @@ function save_firewall_settings {
fi
}
function firewall_block_bad_ip_ranges {
if [ $INSTALLING_MESH ]; then
return
fi
if [[ $(is_completed $FUNCNAME) == "1" ]]; then
return
fi
# There are various blocklists out there, but they're difficult
# to verify. Indiscriminately blocking ranges without evidence
# would be a bad idea.
# From Wikipedia and elsewhere: US military addresses
iptables -A INPUT -s 6.0.0.0/8 -j DROP
iptables -A OUTPUT -s 6.0.0.0/8 -j DROP
iptables -A INPUT -s 7.0.0.0/8 -j DROP
iptables -A OUTPUT -s 7.0.0.0/8 -j DROP
iptables -A INPUT -s 11.0.0.0/8 -j DROP
iptables -A OUTPUT -s 11.0.0.0/8 -j DROP
iptables -A INPUT -s 21.0.0.0/8 -j DROP
iptables -A OUTPUT -s 21.0.0.0/8 -j DROP
iptables -A INPUT -s 22.0.0.0/8 -j DROP
iptables -A OUTPUT -s 22.0.0.0/8 -j DROP
iptables -A INPUT -s 26.0.0.0/8 -j DROP
iptables -A OUTPUT -s 26.0.0.0/8 -j DROP
iptables -A INPUT -s 28.0.0.0/8 -j DROP
iptables -A OUTPUT -s 28.0.0.0/8 -j DROP
iptables -A INPUT -s 29.0.0.0/8 -j DROP
iptables -A OUTPUT -s 29.0.0.0/8 -j DROP
iptables -A INPUT -s 30.0.0.0/8 -j DROP
iptables -A OUTPUT -s 30.0.0.0/8 -j DROP
iptables -A INPUT -s 33.0.0.0/8 -j DROP
iptables -A OUTPUT -s 33.0.0.0/8 -j DROP
iptables -A INPUT -s 55.0.0.0/8 -j DROP
iptables -A OUTPUT -s 55.0.0.0/8 -j DROP
iptables -A INPUT -s 214.0.0.0/8 -j DROP
iptables -A OUTPUT -s 214.0.0.0/8 -j DROP
iptables -A INPUT -s 215.0.0.0/8 -j DROP
iptables -A OUTPUT -s 215.0.0.0/8 -j DROP
save_firewall_settings
mark_completed $FUNCNAME
}
function global_rate_limit {
if ! grep -q "tcp_challenge_ack_limit" /etc/sysctl.conf; then
echo 'net.ipv4.tcp_challenge_ack_limit = 999999999' >> /etc/sysctl.conf

3
src/freedombone-utils-setup
View File

@ -566,6 +566,9 @@ function setup_firewall {
function_check global_rate_limit
global_rate_limit
function_check firewall_block_bad_ip_ranges
firewall_block_bad_ip_ranges
}
function setup_utils {