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OpenVZ nf_tables workaround

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nf_tables is not available in old OpenVZ kernels, so we need to use
iptables-legacy instead.

This issue only affects Debian 10 as it is the only distribution using iptables
with a nf_tables backend by default.

This is supposedly resolved in the newest kernels: https://bit.ly/3fgNZCh

Additionally, a bugfix for the ip6tables path is also included.
This commit is contained in:
Nyr 2020-05-05 16:47:25 +02:00
parent 61549ffcef
commit 2852150a5b
1 changed files with 7 additions and 1 deletions
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8
openvpn-install.sh
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@ -348,6 +348,12 @@ crl-verify crl.pem" >> /etc/openvpn/server/server.conf
# Create a service to set up persistent iptables rules
iptables_path=$(command -v iptables)
ip6tables_path=$(command -v ip6tables)
# Old OpenVZ kernels don't have nf_tables support
# iptables-nft is the default in Debian 10, but we need to use iptables-legacy
if [[ "$os" == "debian" && "$os_version" -eq 10 && "$(systemd-detect-virt)" == "openvz" ]]; then
iptables_path=$(command -v iptables-legacy)
ip6tables_path=$(command -v ip6tables-legacy)
fi
echo "[Unit]
Before=network.target
[Service]
@ -361,7 +367,7 @@ ExecStop=$iptables_path -D INPUT -p $protocol --dport $port -j ACCEPT
ExecStop=$iptables_path -D FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStop=$iptables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/openvpn-iptables.service
if [[ -n "$ip6" ]]; then
echo "ExecStart=/sbin/ip6tables -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
echo "ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
ExecStart=$ip6tables_path -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
ExecStart=$ip6tables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6