59 lines
1.8 KiB
Bash
Executable File
59 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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set -e
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PIDFILE=/var/run/qubes/qubes-firewall.pid
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XENSTORE_IPTABLES=qubes-iptables
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XENSTORE_IPTABLES_HEADER=qubes-iptables-header
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XENSTORE_ERROR=qubes-iptables-error
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OLD_RULES=""
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# PIDfile handling
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[[ -e $PIDFILE ]] && kill -s 0 $(<$PIDFILE) 2>/dev/null && exit 0
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echo $$ >$PIDFILE
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trap 'exit 0' SIGTERM
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FIRST_TIME=yes
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while true; do
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echo "1" > /proc/sys/net/ipv4/ip_forward
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if [ "$FIRST_TIME" ]; then
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FIRST_TIME=
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TRIGGER=reload
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else
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# Wait for changes in xenstore file
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/usr/bin/xenstore-watch-qubes $XENSTORE_IPTABLES
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TRIGGER=$(/usr/bin/xenstore-read $XENSTORE_IPTABLES)
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fi
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if ! [ "$TRIGGER" = "reload" ]; then continue ; fi
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# Disable forwarding to prevent potential "leaks" that might
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# be bypassing the firewall or some proxy service (e.g. tor)
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# during the time when the rules are being (re)applied
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echo "0" > /proc/sys/net/ipv4/ip_forward
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RULES=$(/usr/bin/xenstore-read $XENSTORE_IPTABLES_HEADER)
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IPTABLES_SAVE=$(/sbin/iptables-save | sed '/^\*filter/,/^COMMIT/d')
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OUT=`echo -e "$RULES\n$IPTABLES_SAVE" | /sbin/iptables-restore 2>&1 || true`
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for i in $(xenstore-list qubes-iptables-domainrules) ; do
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RULES=$(/usr/bin/xenstore-read qubes-iptables-domainrules/"$i")
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ERRS=`echo -e "$RULES" | /sbin/iptables-restore -n 2>&1 || true`
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if [ -n "$ERRS" ]; then
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echo "Failed applying rules for $i: $ERRS" >&2
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OUT="$OUT$ERRS"
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fi
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done
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/usr/bin/xenstore-write $XENSTORE_ERROR "$OUT"
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if [ -n "$OUT" ]; then
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DISPLAY=:0 /usr/bin/notify-send -t 3000 "Firewall loading error ($HOSTNAME)" "$OUT" || :
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fi
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# Check if user didn't define some custom rules to be applied as well...
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[ -x /rw/config/qubes-firewall-user-script ] && /rw/config/qubes-firewall-user-script
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# XXX: Backward compatibility
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[ -x /rw/config/qubes_firewall_user_script ] && /rw/config/qubes_firewall_user_script
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done
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