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-rwxr-xr-xroles/common/files/usr/local/sbin/update-firewall.sh102
1 files changed, 32 insertions, 70 deletions
diff --git a/roles/common/files/usr/local/sbin/update-firewall.sh b/roles/common/files/usr/local/sbin/update-firewall.sh
index f25f507..065bae2 100755
--- a/roles/common/files/usr/local/sbin/update-firewall.sh
+++ b/roles/common/files/usr/local/sbin/update-firewall.sh
@@ -40,8 +40,12 @@ check=0
verbose=0
addrfam=
-secmark=0xA99 # must match that in /etc/network/if-up.d/ipsec
-secproto=esp # must match /etc/ipsec.conf; ESP is the default (vs AH/IPComp)
+secproto=esp # must match /etc/ipsec.conf; ESP is the default (vs AH/IPComp)
+if [ -x /usr/sbin/ipsec ] && /usr/sbin/ipsec status >/dev/null; then
+ ipsec=y
+else
+ ipsec=n
+fi
fail2ban_re='^(\[[0-9]+:[0-9]+\]\s+)?-A fail2ban-\S'
IPSec_re=" -m policy --dir (in|out) --pol ipsec --reqid [0-9]+ --proto $secproto -j ACCEPT$"
@@ -152,21 +156,9 @@ run() {
tables[$f]=filter
# The default interface associated with this address.
- local if=$( /bin/ip -$f route show to default scope global \
+ local if=$( /bin/ip -$f -o route show to default scope global \
| sed -nr '/^default via \S+ dev (\S+).*/ {s//\1/p;q}' )
- # The virtual interface reserved for IPSec.
- local ifsec=$( /bin/ip -o -$f link show \
- | sed -nr "/^[0-9]+:\s+(sec[0-9]+)@$if:\s.*/ {s//\1/p;q}" )
-
- # The (host-scoped) IP reserved for IPSec.
- local ipsec=
- if [ "$ifsec" -a $f = 4 ]; then
- tables[$f]='mangle nat filter'
- ipsec=$( /bin/ip -$f address show dev "$ifsec" scope host \
- | sed -nr '/^\s+inet\s(\S+).*/ {s//\1/p;q}' )
- fi
-
# Store the old (current) ruleset
local old=$(mktemp --tmpdir current-rules.v$f.XXXXXX) \
new=$(mktemp --tmpdir new-rules.v$f.XXXXXX)
@@ -203,8 +195,9 @@ run() {
grep -E -- "$fail2ban_re" "$old" || true
fi >> "$new"
- if [ "$ipsec" ]; then
- # (Host-to-host) IPSec tunnels come first. TODO: test IPSec with IPv6.
+ if [ "$f" = 4 -a "$ipsec" = y ]; then
+ # Our IPSec tunnels are IPv4 only.
+ # (Host-to-host) IPSec tunnels come first.
grep -E -- "$IPSec_re" "$old" >> "$new" || true
# Allow any IPsec $secproto protocol packets to be sent and received.
@@ -219,15 +212,24 @@ run() {
# http://baldric.net/loose-iptables-firewall-for-servers/
local ip
- if [ "$f" = 4 ]; then
+ if [ "$f" = 4 -a "$ipsec" = y ]; then
# Private-use networks (RFC 1918) and link local (RFC 3927)
- local MyNetwork=$( /bin/ip -4 address show dev $if scope global \
- | sed -nr 's/^\s+inet\s(\S+).*/\1/p')
+ local MyIPSec="$( /bin/ip -4 -o route show table 220 dev $if | sed 's/\s.*//' )"
+ local MyNetwork="$( /bin/ip -4 -o address show dev $if scope global \
+ | sed -nr "s/^[0-9]+:\s+$if\s+inet\s(\S+).*/\1/p" \
+ | while read ip; do
+ for ips in $MyIPSec; do
+ [ "$ips" = "$(/usr/bin/netmask -nc "$ip" "$ips" | sed 's/^ *//')" ] || echo "$ip"
+ done
+ done
+ )"
[ "$MyNetwork" ] && \
for ip in 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 169.254.0.0/16; do
# Don't lock us out if we are behind a NAT ;-)
- [ "$ip" = "$(/usr/bin/netmask -nc $ip $MyNetwork | sed 's/ //g')" ] \
- || iptables -A INPUT -i $if -s "$ip" -j DROP
+ for myip in $MyNetwork; do
+ [ "$ip" = "$(/usr/bin/netmask -nc "$ip" "$myip" | sed 's/^ *//')" ] \
+ || iptables -A INPUT -i $if -s "$ip" -j DROP
+ done
done
# Other martian packets: "This" network, multicast, broadcast (RFCs
@@ -259,14 +261,14 @@ run() {
local localhost=$(inet46 $f '127.0.0.1/8' '::1/128')
iptables -A INPUT -i lo -s "$localhost" -d "$localhost" -j ACCEPT
iptables -A OUTPUT -o lo -s "$localhost" -d "$localhost" -j ACCEPT
-
- if [ "$ipsec" ]; then
- # ACCEPT any, *IPSec* traffic destinating to the non-routable
- # $ipsec. Also ACCEPT all traffic originating from $ipsec, as
- # it is MASQUERADE'd.
- iptables -A INPUT -d "$ipsec" -i $if -m policy --dir in \
- --pol ipsec --proto $secproto -j ACCEPT
- iptables -A OUTPUT -m mark --mark "$secmark" -o $if -j ACCEPT
+ if [ "$f" = 4 -a "$ipsec" = y ]; then
+ # Allow local access to our virtual IP
+ /bin/ip -4 -o route show table 220 dev $if \
+ | sed -nr 's/.*\ssrc\s+([[:digit:].]{7,15})(\s.*)?/\1/p' \
+ | while read ipsec; do
+ iptables -A INPUT -i lo -s "$ipsec" -d "$ipsec" -j ACCEPT
+ iptables -A OUTPUT -o lo -s "$ipsec" -d "$ipsec" -j ACCEPT
+ done
fi
# Prepare fail2ban. We make fail2ban insert its rules in a
@@ -330,46 +332,6 @@ run() {
########################################################################
commit
- if [ "$ipsec" ]; then
- # DNAT the IPSec paquets to $ipsec after decapsulation, and SNAT
- # them before encapsulation. We need to do the NAT'ing before
- # packets enter the IPSec stack because they are signed
- # afterwards, and NAT'ing would mess up the signature.
- ipt-chains mangle PREROUTING:ACCEPT INPUT:ACCEPT \
- FORWARD:DROP \
- OUTPUT:ACCEPT POSTROUTING:ACCEPT
-
- # Packets which destination is $ipsec *must* be associated with
- # an IPSec policy.
- iptables -A INPUT -d "$ipsec" -i $if -m policy --dir in \
- --pol ipsec --proto $secproto -j ACCEPT
- iptables -A INPUT -d "$ipsec" -i $if -j DROP
-
- # Packets originating from our (non-routable) $ipsec are marked;
- # if there is no xfrm lookup (i.e., no matching IPSec
- # association), the packet will retain its mark and be null
- # routed later on. Otherwise, the packet is re-queued unmarked.
- iptables -A OUTPUT -o $if -j MARK --set-mark 0x0
- iptables -A OUTPUT -s "$ipsec" -o $if -m policy --dir out \
- --pol none -j MARK --set-mark $secmark
- commit
-
- ipt-chains nat PREROUTING:ACCEPT INPUT:ACCEPT \
- OUTPUT:ACCEPT POSTROUTING:ACCEPT
-
- # DNAT all marked packets after decapsulation.
- iptables -A PREROUTING \! -d "$ipsec" -i $if -m policy --dir in \
- --pol ipsec --proto $secproto -j DNAT --to "${ipsec%/*}"
-
- # Packets originating from our IPSec are SNAT'ed (MASQUERADE).
- # (And null-routed later on unless there is an xfrm
- # association.)
- iptables -A POSTROUTING -m mark --mark $secmark -o $if -j MASQUERADE
- commit
- fi
-
- ########################################################################
-
local rv1=0 rv2=0 persistent=/etc/iptables/rules.v$f
local oldz=$(mktemp --tmpdir current-rules.v$f.XXXXXX)