diff options
Diffstat (limited to 'roles/common/files/etc/network/if-pre-up.d/iptables')
| -rwxr-xr-x | roles/common/files/etc/network/if-pre-up.d/iptables | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/roles/common/files/etc/network/if-pre-up.d/iptables b/roles/common/files/etc/network/if-pre-up.d/iptables new file mode 100755 index 0000000..6a50948 --- /dev/null +++ b/roles/common/files/etc/network/if-pre-up.d/iptables @@ -0,0 +1,38 @@ +#!/bin/bash +# +# A pre-up hook to auto-(re)load the iptables rulesets whenever the +# network is brought up. If the action fails, an alert message is passed +# to syslogd. +# +# Copyright 2013 Guilhem Moulin <guilhem@fripost.org> +# +# Licensed under the GNU GPL version 3 or higher. +# + +set -uo pipefail +PATH=/usr/sbin:/usr/bin:/sbin:/bin + +# NOTE: syslog starts after networking during the boot process, messages +# won't be logged at boot time. +log="/usr/bin/logger -st firewall" + +# Ignore the loopback interface; run the strip for ifup only. +[ "$IFACE" != lo -a "$MODE" = start ] || exit 0 + +# We support only IPv4 and IPv6. +[ "$ADDRFAM" = inet -o "$ADDRFAM" = inet6 ] || exit 0 + +$log -p syslog.info -- "Loading $ADDRFAM firewall on interface $IFACE." + +case "$ADDRFAM" in + inet) iptr=/sbin/iptables-restore; rules=rules.v4;; + inet6)iptr=/sbin/ip6tables-restore; rules=rules.v6;; +esac +rules="/etc/iptables/$rules" + +$iptr < $rules 2>&1 | $log -p syslog.err +rv=$? + +[ $rv -gt 0 ] && $log -p syslog.alert \ + "WARN: Failed to load iptables rulesets; the machine may be unprotected!" +exit $rv |