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firewall: add ipxtables helper

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This commit is contained in:
Girish Ramakrishnan
2022-02-09 22:13:12 -08:00
parent 8f4779ad2f
commit d6d7bc93e8
1 changed files with 40 additions and 55 deletions
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95
setup/start/cloudron-firewall.sh
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@@ -4,10 +4,15 @@ set -eu -o pipefail
echo "==> Setting up firewall"
####### IPv4
has_ipv6=$(cat /proc/net/if_inet6 >/dev/null 2>&1 && echo "yes" || echo "no")
iptables -t filter -N CLOUDRON || true
iptables -t filter -F CLOUDRON # empty any existing rules
function ipxtables() {
iptables "$@"
[[ "${has_ipv6}" == "yes" ]] && ip6tables "$@"
}
ipxtables -t filter -N CLOUDRON || true
ipxtables -t filter -F CLOUDRON # empty any existing rules
# first setup any user IP block lists
ipset create cloudron_blocklist hash:net || true
@@ -20,22 +25,22 @@ if ! iptables -t filter -C DOCKER-USER -m set --match-set cloudron_blocklist src
fi
# allow related and establisted connections
iptables -t filter -A CLOUDRON -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -A CLOUDRON -p tcp -m tcp -m multiport --dports 22,80,202,443 -j ACCEPT # 202 is the alternate ssh port
ipxtables -t filter -A CLOUDRON -m state --state RELATED,ESTABLISHED -j ACCEPT
ipxtables -t filter -A CLOUDRON -p tcp -m tcp -m multiport --dports 22,80,202,443 -j ACCEPT # 202 is the alternate ssh port
# whitelist any user ports. we used to use --dports but it has a 15 port limit (XT_MULTI_PORTS)
ports_json="/home/yellowtent/platformdata/firewall/ports.json"
if allowed_tcp_ports=$(node -e "console.log(JSON.parse(fs.readFileSync('${ports_json}', 'utf8')).allowed_tcp_ports.join(','))" 2>/dev/null); then
IFS=',' arr=(${allowed_tcp_ports})
for p in "${arr[@]}"; do
iptables -A CLOUDRON -p tcp -m tcp --dport "${p}" -j ACCEPT
ipxtables -A CLOUDRON -p tcp -m tcp --dport "${p}" -j ACCEPT
done
fi
if allowed_udp_ports=$(node -e "console.log(JSON.parse(fs.readFileSync('${ports_json}', 'utf8')).allowed_udp_ports.join(','))" 2>/dev/null); then
IFS=',' arr=(${allowed_udp_ports})
for p in "${arr[@]}"; do
iptables -A CLOUDRON -p udp -m udp --dport "${p}" -j ACCEPT
ipxtables -A CLOUDRON -p udp -m udp --dport "${p}" -j ACCEPT
done
fi
@@ -44,7 +49,6 @@ ipset flush cloudron_ldap_allowlist
ldap_allowlist_json="/home/yellowtent/platformdata/firewall/ldap_allowlist.txt"
if [[ -f "${ldap_allowlist_json}" ]]; then
# without the -n block, any last line without a new line won't be read it!
while read -r line || [[ -n "$line" ]]; do
[[ -z "${line}" ]] && continue # ignore empty lines
@@ -53,53 +57,56 @@ if [[ -f "${ldap_allowlist_json}" ]]; then
done < "${ldap_allowlist_json}"
# ldap server we expose 3004 and also redirect from standard ldaps port 636
iptables -t nat -I PREROUTING -p tcp --dport 636 -j REDIRECT --to-ports 3004
ipxtables -t nat -I PREROUTING -p tcp --dport 636 -j REDIRECT --to-ports 3004
iptables -t filter -A CLOUDRON -m set --match-set cloudron_ldap_allowlist src -p tcp --dport 3004 -j ACCEPT
fi
# turn and stun service
iptables -t filter -A CLOUDRON -p tcp -m multiport --dports 3478,5349 -j ACCEPT
iptables -t filter -A CLOUDRON -p udp -m multiport --dports 3478,5349 -j ACCEPT
iptables -t filter -A CLOUDRON -p udp -m multiport --dports 50000:51000 -j ACCEPT
ipxtables -t filter -A CLOUDRON -p tcp -m multiport --dports 3478,5349 -j ACCEPT
ipxtables -t filter -A CLOUDRON -p udp -m multiport --dports 3478,5349 -j ACCEPT
ipxtables -t filter -A CLOUDRON -p udp -m multiport --dports 50000:51000 -j ACCEPT
# ICMPv6 is very fundamental to IPv6 connectivity unlike ICMPv4
iptables -t filter -A CLOUDRON -p icmp --icmp-type echo-request -j ACCEPT
iptables -t filter -A CLOUDRON -p icmp --icmp-type echo-reply -j ACCEPT
iptables -t filter -A CLOUDRON -p udp --sport 53 -j ACCEPT
ip6tables -t filter -A CLOUDRON -p ipv6-icmp -j ACCEPT
ipxtables -t filter -A CLOUDRON -p udp --sport 53 -j ACCEPT
iptables -t filter -A CLOUDRON -s 172.18.0.0/16 -j ACCEPT # required to accept any connections from apps to our IP:<public port>
iptables -t filter -A CLOUDRON -i lo -j ACCEPT # required for localhost connections (mysql)
ipxtables -t filter -A CLOUDRON -i lo -j ACCEPT # required for localhost connections (mysql)
# log dropped incoming. keep this at the end of all the rules
iptables -t filter -A CLOUDRON -m limit --limit 2/min -j LOG --log-prefix "IPTables Packet Dropped: " --log-level 7
iptables -t filter -A CLOUDRON -j DROP
ipxtables -t filter -A CLOUDRON -m limit --limit 2/min -j LOG --log-prefix "Packet dropped: " --log-level 7
ipxtables -t filter -A CLOUDRON -j DROP
if ! iptables -t filter -C INPUT -j CLOUDRON 2>/dev/null; then
iptables -t filter -I INPUT -j CLOUDRON
fi
# prepend our chain to the filter table
iptables -t filter -C INPUT -j CLOUDRON 2>/dev/null || iptables -t filter -I INPUT -j CLOUDRON
ip6tables -t filter -C INPUT -j CLOUDRON 2>/dev/null || ip6tables -t filter -I INPUT -j CLOUDRON
# Setup rate limit chain (the recent info is at /proc/net/xt_recent)
iptables -t filter -N CLOUDRON_RATELIMIT || true
iptables -t filter -F CLOUDRON_RATELIMIT # empty any existing rules
ipxtables -t filter -N CLOUDRON_RATELIMIT || true
ipxtables -t filter -F CLOUDRON_RATELIMIT # empty any existing rules
# log dropped incoming. keep this at the end of all the rules
iptables -t filter -N CLOUDRON_RATELIMIT_LOG || true
iptables -t filter -F CLOUDRON_RATELIMIT_LOG # empty any existing rules
iptables -t filter -A CLOUDRON_RATELIMIT_LOG -m limit --limit 2/min -j LOG --log-prefix "IPTables RateLimit: " --log-level 7
iptables -t filter -A CLOUDRON_RATELIMIT_LOG -j DROP
ipxtables -t filter -N CLOUDRON_RATELIMIT_LOG || true
ipxtables -t filter -F CLOUDRON_RATELIMIT_LOG # empty any existing rules
ipxtables -t filter -A CLOUDRON_RATELIMIT_LOG -m limit --limit 2/min -j LOG --log-prefix "IPTables RateLimit: " --log-level 7
ipxtables -t filter -A CLOUDRON_RATELIMIT_LOG -j DROP
# http https
for port in 80 443; do
iptables -A CLOUDRON_RATELIMIT -p tcp --syn --dport ${port} -m connlimit --connlimit-above 5000 -j CLOUDRON_RATELIMIT_LOG
ipxtables -A CLOUDRON_RATELIMIT -p tcp --syn --dport ${port} -m connlimit --connlimit-above 5000 -j CLOUDRON_RATELIMIT_LOG
done
# ssh
for port in 22 202; do
iptables -A CLOUDRON_RATELIMIT -p tcp --dport ${port} -m state --state NEW -m recent --set --name "public-${port}"
iptables -A CLOUDRON_RATELIMIT -p tcp --dport ${port} -m state --state NEW -m recent --update --name "public-${port}" --seconds 10 --hitcount 5 -j CLOUDRON_RATELIMIT_LOG
ipxtables -A CLOUDRON_RATELIMIT -p tcp --dport ${port} -m state --state NEW -m recent --set --name "public-${port}"
ipxtables -A CLOUDRON_RATELIMIT -p tcp --dport ${port} -m state --state NEW -m recent --update --name "public-${port}" --seconds 10 --hitcount 5 -j CLOUDRON_RATELIMIT_LOG
done
# ldaps
for port in 636 3004; do
iptables -A CLOUDRON_RATELIMIT -p tcp --syn --dport ${port} -m connlimit --connlimit-above 5000 -j CLOUDRON_RATELIMIT_LOG
ipxtables -A CLOUDRON_RATELIMIT -p tcp --syn --dport ${port} -m connlimit --connlimit-above 5000 -j CLOUDRON_RATELIMIT_LOG
done
# docker translates (dnat) 25, 587, 993, 4190 in the PREROUTING step
@@ -117,31 +124,9 @@ for port in 3306 5432 6379 27017; do
iptables -A CLOUDRON_RATELIMIT -p tcp --syn -s 172.18.0.0/16 -d 172.18.0.0/16 --dport ${port} -m connlimit --connlimit-above 5000 -j CLOUDRON_RATELIMIT_LOG
done
if ! iptables -t filter -C INPUT -j CLOUDRON_RATELIMIT 2>/dev/null; then
iptables -t filter -I INPUT 1 -j CLOUDRON_RATELIMIT
fi
iptables -t filter -C INPUT -j CLOUDRON_RATELIMIT 2>/dev/null || iptables -t filter -I INPUT 1 -j CLOUDRON_RATELIMIT
ip6tables -t filter -C INPUT -j CLOUDRON_RATELIMIT 2>/dev/null || ip6tables -t filter -I INPUT 1 -j CLOUDRON_RATELIMIT
# Workaround issue where Docker insists on adding itself first in FORWARD table
iptables -D FORWARD -j CLOUDRON_RATELIMIT || true
iptables -I FORWARD 1 -j CLOUDRON_RATELIMIT
####### IPv6
# if file exists and has some content (despite being 0 size)
if cat /proc/net/if_inet6 >/dev/null 2>&1; then
echo "==> Setting up IPv6 firewall"
ip6tables -t filter -N CLOUDRON || true
ip6tables -t filter -F CLOUDRON # empty any existing rules
ip6tables -t filter -A CLOUDRON -m state --state RELATED,ESTABLISHED -j ACCEPT
ip6tables -t filter -A CLOUDRON -p tcp -m tcp -m multiport --dports 22,80,202,443 -j ACCEPT # 202 is the alternate ssh port
ip6tables -t filter -A CLOUDRON -m limit --limit 2/min -j LOG --log-prefix "IP6Tables Packet Dropped: " --log-level 7
# ip6tables -t filter -A CLOUDRON -j DROP
if ! ip6tables -t filter -C INPUT -j CLOUDRON 2>/dev/null; then
ip6tables -t filter -I INPUT -j CLOUDRON
fi
fi
echo "==> Setting up firewall done"
ipxtables -D FORWARD -j CLOUDRON_RATELIMIT || true
ipxtables -I FORWARD 1 -j CLOUDRON_RATELIMIT