Would this version be more to your liking? I'm just trying to evolve this script to answer as many of the questions / concerns that are being posed on the list.
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --name SSH --set --rsource -j SSH_Brute_Force
iptables -A SSH_Brute_Force -s $My_Home_Firewall_IP -j RETURN
iptables -A SSH_Brute_Force -s $My_Office_Firewall_IP -j RETURN
iptables -A SSH_Brute_Force -s $My_Girlfriends_Firewall_IP list -j RETURN
iptables -A SSH_Brute_Force -m recent ! --rcheck --seconds 60 --hitcount 3 --name SSH --rsource -j RETURN iptables -A SSH_Brute_Force -j LOG --log-prefix "SSH Brute Force Attempt: "
iptables -A SSH_Brute_Force -p tcp -j TARPIT
I have tested this script on my home firewall and have found it to work the way that it is intended, so give it a try and see what you think. Any and all feedback is welcome and appreciated.
Hi all
For some funny reason I still cant seem to get this right. I tried connecting from home (dynamic assigned ip) and I still cant connect.
I can connect to my other two server 100%, but the one im trying this on. I still cant seem to get it right.
Brent
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May 25 06:21:51 ns kernel: [INPUT DROP]: IN=eth0 OUT= MAC=00:0c:76:5e:d3:61:00:d0:02:eb:84:0a:08:00 SRC=165.146.144.131 DST=217.199.186.118 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=40576 DF PROTO=TCP SPT=30066 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204055001010402)
May 25 06:21:54 ns kernel: [INPUT DROP]: IN=eth0 OUT= MAC=00:0c:76:5e:d3:61:00:d0:02:eb:84:0a:08:00 SRC=165.146.144.131 DST=217.199.186.118 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=40578 DF PROTO=TCP SPT=30066 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204055001010402)
May 25 06:22:00 ns kernel: SSH Brute Force Attempt: IN=eth0 OUT= MAC=00:0c:76:5e:d3:61:00:d0:02:eb:84:0a:08:00 SRC=165.146.144.131 DST=217.199.186.118 LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=40585 DF PROTO=TCP SPT=30066 DPT=22 WINDOW=65535 RES=0x00 SYN URGP=0
$IPT -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -t filter -A INPUT -m state --state INVALID -j LOG --log-prefix "INVALID input: " --log-tcp-options --log-ip-options
$IPT -t filter -A INPUT -m state --state INVALID -j DROP
$IPT -t filter -A INPUT -p tcp --dport 113 -j REJECT --reject-with icmp-host-unreachable
$IPT -t filter -A INPUT -d 217.199.186.255 -j DROP
$IPT -t filter -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
$IPT -t filter -A INPUT -p tcp --dport 20 -m state --state NEW -j ACCEPT
$IPT -t filter -A INPUT -p tcp --dport 21 -m state --state NEW -j ACCEPT
$IPT -t filter -A INPUT -p tcp --dport 25 -m state --state NEW -j ACCEPT
$IPT -N SSH_Brute_Force
$IPT -A INPUT -p tcp --dport 22 -m state --state NEW -m recent --name SSH --set --rsource -j SSH_Brute_Force
$IPT -A SSH_Brute_Force -s 196.31.9.82 -j RETURN
$IPT -A SSH_Brute_Force -m recent ! --rcheck --seconds 60 --hitcount 3 --name SSH --rsource -j RETURN
$IPT -A SSH_Brute_Force -j LOG --log-prefix "SSH Brute Force Attempt: "
$IPT -A SSH_Brute_Force -p tcp -j DROP
$IPT -t filter -A INPUT -p tcp --dport 10000 -m state --state NEW -j ACCEPT
$IPT -t filter -A INPUT -p tcp --dport 135 -j DROP
$IPT -t filter -A INPUT -p tcp --dport 113 -j REJECT --reject-with icmp-host-unreachable
$IPT -t filter -A INPUT -p icmp --icmp-type source-quench -j ACCEPT
$IPT -t filter -A INPUT -p icmp --icmp-type parameter-problem -j ACCEPT
$IPT -t filter -A INPUT -p icmp --icmp-type destination-unreachable -j ACCEPT
$IPT -t filter -A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
$IPT -t filter -A INPUT -p icmp --icmp-type ! echo-request -j LOG
$IPT -t filter -A INPUT -j LOG --log-prefix "[INPUT DROP]: " --log-tcp-options --log-ip-options
$IPT -t filter -A INPUT -j DROP
