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|
#!/bin/ash
# Reloads iptables rules by flushing the tables and applying everything
# in /opt/openslx/iptables/rules.d again. Actions are delayed by 5 seconds
# to coalesce changes, since inotifyd can trigger dozens of events in a row.
#
# This scriptis triggered by inotifyd, see openslx-iptables_reloader.service
ALL_RULES="/run/iptables-reloader.cache"
LOCK="/run/iptables-reloader.lock"
WAIT="/run/iptables-reloader.wait"
# Expects $1 to be the PID/ID
reload_rules () {
sleep 2
ctr=0
while ! mkdir "$WAIT" &> /dev/null && [ "$ctr" -lt 5 ]; do
echo "$1 WAITLOOP"
sleep 1
ctr=$(( ctr + 1 ))
done
rm -rf -- "$LOCK"
echo "$1 RUN"
rm -f -- "${ALL_RULES}.new"
for file in /opt/openslx/iptables/rules.d/*; do
[ -f "$file" ] || continue
cat "$file" >> "${ALL_RULES}.new"
done
# No change? Do nothing...
if [ -s "${ALL_RULES}" ] && [ -s "${ALL_RULES}.new" ] && diff "${ALL_RULES}" "${ALL_RULES}.new"; then
echo "$1 NOCHANGE"
rm -rf -- "${ALL_RULES}.new" "$WAIT"
exit 0
fi
# Reset
# Filter
for chain in INPUT FORWARD OUTPUT; do
iptables -w -t filter -P "$chain" ACCEPT
iptables -w -t filter -N "ipt-helper-$chain" 2>/dev/null
iptables -w -t filter -F "ipt-helper-$chain"
iptables -w -t filter -D "$chain" -j "ipt-helper-$chain" 2>/dev/null # make sure it's number one
iptables -w -t filter -I "$chain" 1 -j "ipt-helper-$chain"
done
# NAT
for chain in INPUT OUTPUT PREROUTING POSTROUTING; do
iptables -w -t nat -P "$chain" ACCEPT
iptables -w -t nat -N "ipt-helper-$chain" 2>/dev/null
iptables -w -t nat -F "ipt-helper-$chain"
iptables -w -t nat -D "$chain" -j "ipt-helper-$chain" 2>/dev/null # make sure it's number one
iptables -w -t nat -I "$chain" 1 -j "ipt-helper-$chain"
done
# Mangle
for chain in INPUT FORWARD OUTPUT PREROUTING POSTROUTING; do
iptables -w -t mangle -P "$chain" ACCEPT
iptables -w -t mangle -N "ipt-helper-$chain" 2>/dev/null
iptables -w -t mangle -F "ipt-helper-$chain"
iptables -w -t mangle -D "$chain" -j "ipt-helper-$chain" 2>/dev/null # make sure it's number one
iptables -w -t mangle -I "$chain" 1 -j "ipt-helper-$chain"
done
# Apply
local LOGFILE=$(mktemp)
local DISABLED="/opt/openslx/iptables/rules.d/disabled/"
for file in /opt/openslx/iptables/rules.d/*; do
[ -f "$file" ] || continue
if [ ! -x "$file" ]; then
slxlog "firewall-script-exec" "The firewall script '$file' is not executable (+x), moving to disabled/"
mkdir -p "$DISABLED"
mv "$file" "$DISABLED"
continue
fi
# patch chain names, add "-w"
sed -i -r 's/ (-A|--append|-I|--insert|-D|--delete) +(PREROUTING|INPUT|FORWARD|OUTPUT|POSTROUTING) / \1 ipt-helper-\2 /g;s/iptables +-/iptables -w -/g' "$file"
if ! "$file" > "$LOGFILE" 2>&1; then
slxlog "firewall-script-apply" "The firewall script '$file' had nonzero exit code. Moving to disabled/" "$LOGFILE"
mkdir -p "$DISABLED"
mv "$file" "$DISABLED"
fi
done
# Add default rule
for chain in INPUT FORWARD OUTPUT; do
iptables -w -t filter -A "ipt-helper-$chain" -j RETURN
done
# NAT
for chain in INPUT OUTPUT PREROUTING POSTROUTING; do
iptables -w -t nat -A "ipt-helper-$chain" -j RETURN
done
# Mangle
for chain in INPUT FORWARD OUTPUT PREROUTING POSTROUTING; do
iptables -w -t mangle -A "ipt-helper-$chain" -j RETURN
done
# Do not just move file from above, as we sed'ed above and contents might have changed
rm -f -- "${ALL_RULES}.new"
for file in /opt/openslx/iptables/rules.d/*; do
[ -f "$file" ] || continue
cat "$file" >> "${ALL_RULES}.new"
done
mv -f -- "${ALL_RULES}.new" "${ALL_RULES}"
echo "iptables rules successfully updated."
rm -rf -- "$WAIT"
echo "$1 DONE"
exit 0
}
echo "$$ INOTIFY"
if mkdir "$LOCK" &> /dev/null; then
reload_rules "$$" &
fi
exit 0
|
