1 files changed, 5 insertions, 3 deletions
diff --git a/roles/common/files/usr/local/sbin/update-firewall.sh b/roles/common/files/usr/local/sbin/update-firewall.sh
index 4050e9e..cfd2678 100755
--- a/roles/common/files/usr/local/sbin/update-firewall.sh
+++ b/roles/common/files/usr/local/sbin/update-firewall.sh
@@ -236,70 +236,72 @@ run() {
             iptables -A INPUT -i $if -s "$ip" -j DROP
             iptables -A INPUT -i $if -d "$ip" -j DROP
         done
 
     elif [ "$f" = 6 ]; then
         # Martian IPv6 packets: ULA (RFC 4193) and site local addresses
         # (RFC 3879).
         for ip in fc00::/7 fec0::/10; do
             iptables -A INPUT -i $if -s "$ip" -j DROP
             iptables -A INPUT -i $if -d "$ip" -j DROP
         done
     fi
 
     # DROP INVALID packets immediately.
     iptables -A INPUT  -m state --state INVALID -j DROP
     iptables -A OUTPUT -m state --state INVALID -j DROP
 
     # DROP bogus TCP packets.
     iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
     iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP
+    iptables -A INPUT -p tcp \! --syn -m state --state NEW      -j DROP
 
     # Allow all input/output to/from the loopback interface.
     local localhost=$(inet46 $f '127.0.0.1/32' '::1/128')
     iptables -A INPUT  -i lo -s "$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
     fi
 
     # Prepare fail2ban.  We make fail2ban insert its rules in a
     # dedicated chain, so that it doesn't mess up the existing rules.
     [ $fail2ban -eq 1 ] && iptables -A INPUT -i $if -j fail2ban
 
     if [ "$f" = 4 ]; then
         # Allow only ICMP of type 0, 3 and 8.  The rate-limiting is done
         # directly by the kernel (net.ipv4.icmp_ratelimit and
         # net.ipv4.icmp_ratemask runtime options).  See icmp(7).
         local t
         for t in  'echo-reply' 'destination-unreachable' 'echo-request'; do
-            iptables -A INPUT  -i $if -p icmp -m icmp --icmp-type $t -j ACCEPT
-            iptables -A OUTPUT -o $if -p icmp -m icmp --icmp-type $t -j ACCEPT
+            iptables -A INPUT  -p icmp -m icmp --icmp-type $t -j ACCEPT
+            iptables -A OUTPUT -p icmp -m icmp --icmp-type $t -j ACCEPT
         done
     elif [ $f = 6 ]; then
-        iptables -A INPUT -i $ip -p icmpv6 -j ACCEPT
+        iptables -A INPUT  -p icmpv6 -j ACCEPT
+        iptables -A OUTPUT -p icmpv6 -j ACCEPT
     fi
 
 
     ########################################################################
     # ACCEPT new connections to the services we provide, or to those we want
     # to connect to.
 
     sed -re 's/#.*//; /^\s*$/d' -e "s/^(in|out|inout)$f?(\s.*)/\1\2/" \
             /etc/iptables/services | \
     grep -Ev '^(in|out|inout)\S\s' | \
     while read dir proto dport sport; do
         # We add two entries per config line: we need to accept the new
         # connection, and latter the reply.
         local stNew=NEW,ESTABLISHED
         local stEst=ESTABLISHED
 
         # In-Out means full-duplex
         [[ "$dir" =~ ^inout ]] && stEst="$stNew"
 
         local iptNew= iptEst= optsNew= optsEst=