Many of you probably know about port scanning. It’s a very simple process, where essentially you attempt to to make a connection on several ports of several machines. If the port is closed, a reset is returned. If the port is open, a SYN+ACK is returned.
Now, there are some other types of scans, such as a FIN scan, Xmas Tree scan, and a NULL scan. These basically work on the same principals of a SYN (normal) scan, but using some different TCP flags (ones that should never be seen in valid TCP connections).
If you’d like, read up on the different types of scans here, which is also a good site to determine what type of reply you want to give the scanning host. It also shows how to perform the scans using NMap.
So, most of the time, you want to just drop invalid packets, since the easiest way to deal with them is not to. However, you may wish to use REJECT here, since what the host does and does not return is part of the data collected. Being able to decide what to return could give you an edge over an attacker. If you return tcp-resets, then you can make an attacker (or more likely a bot) think that all the ports on the host are closed. Different operating systems also respond differently to the various stealth scans, so be mindful of that as well.
I wrote some simple firewall rules to detect, log, and block (either with a tcp-reset or just dropping the packet entirly. This script was made to run on top of an existng firewall.
## IPTables rules for detecting and blocking several different scans
## By Drew Tingen GlimpseIntoEntropy.Blogspot.com
## NOTE: Please understand the use of REJECT/DROP
## NOTE2: You may want to mirror the FORWARD rules to INPUT
## Note on Rule Order – since these are Inserts (designed to be easily plugged into
## an existing iptables config), the packet actions are above the logging action.
## If you put these at the top of a config, and change the -I to -A, reverse the order
## of the rules for logging to work properly
## TCP Null Scan
### Action for packets
### use REJECT option to make port look closed. Use drop for open/stealth
iptables -I FORWARD -p tcp –tcp-flags ALL NONE -j REJECT –reject-with tcp-reset
#iptables -I FORWARD -p tcp –tcp-flags ALL NONE -j DROP
### Detect and log
iptables -I FORWARD -p tcp –tcp-flags ALL NONE -j LOG –log-prefix “TCP Null Scan”
## TCP Fin Scan
### Action for packets
iptables -I FORWARD -p tcp –tcp-flags FIN,SYN FIN -m state –state NEW,INVALID -j REJECT –reject-with tcp-reset
#iptables -I FORWARD -p tcp –tcp-flags FIN,SYN FIN -m state –state NEW,INVALID -j DROP
### Detect and Log
iptables -I FORWARD -p tcp –tcp-flags FIN,SYN FIN -m state –state NEW,INVALID -j LOG –log-prefix “TCP FIN Scan”
## TCP Xmas Tree Scan
### Action for packets
iptables -I FORWARD -p tcp –tcp-flags ALL URG,PSH,FIN -j REJECT –reject-with tcp-reset
#iptables -I FORWARD -p tcp –tcp-flags ALL URG,PSH,FIN -j DROP
### Detect and Log
iptalbes -I FORWARD -p tcp –tcp-flags ALL URG,PSH,FIN -j LOG –log-prefix “Xmas Tree Scan”
#! / Bin / sh
# ————————————————- —————————–
#
# File: SIG-antiDDoS.sh
#
# ————————————————- —————————–
# For debugging use iptables-v.
IPTABLES = “/ sbin / iptables”
IP6TABLES = “/ sbin/ip6tables”
MODPROBE = “/ sbin / modprobe”
RMMOD = “/ sbin / rmmod”
ARP = “/ usr / sbin / arp”
# Logging options.
# ————————————————- —————————–
LOG = “LOG – log-level debug – log-tcp-sequence – log-tcp-options”
LOG = “$ LOG – log-ip-options”
# Defaults for rate limiting
# ————————————————- —————————–
RLIMIT = “-m limit – limit 3 / s – limit-burst 8”
# Unprivileged ports.
# ————————————————- —————————–
PHIGH = “1024:65535”
PSSH = “1000:1023”
# Load required kernel modules
# ————————————————- —————————–
$ MODPROBE ip_conntrack_ftp
$ MODPROBE ip_conntrack_irc
# Mitigate ARP spoofing / poisoning and similar attacks.
# ————————————————- —————————–
# Hardcode static ARP cache entries here
# $ ARP-s IP-ADDRESS MAC-ADDRESS
# Kernel configuration.
# ————————————————- —————————–
# Disable IP forwarding.
# On => Off = (reset)
echo 1> / proc/sys/net/ipv4/ip_forward
echo 0> / proc/sys/net/ipv4/ip_forward
# Enable IP spoofing protection
for i in / proc/sys/net/ipv4/conf / * / rp_filter; do echo 1> $ i; done
# Protect against SYN flood attacks
echo 1> / proc/sys/net/ipv4/tcp_syncookies
# Ignore all incoming ICMP echo requests
echo 0> / proc/sys/net/ipv4/icmp_echo_ignore_all
# Ignore ICMP echo requests to broadcast
echo 1> / proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
# Log packets with impossible addresses.
for i in / proc/sys/net/ipv4/conf / * / log_martians; do echo 1> $ i; done
# Don’t log invalid responses to broadcast
echo 1> / proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
# Don’t accept or send ICMP redirects.
for i in / proc/sys/net/ipv4/conf / * / accept_redirects; do echo 0> $ i; done
for i in / proc/sys/net/ipv4/conf / * / send_redirects; do echo 0> $ i; done
# Don’t accept source routed packets.
for i in / proc/sys/net/ipv4/conf / * / accept_source_route; do echo 0> $ i; done
# Disable multicast routing
for i in / proc/sys/net/ipv4/conf / * / mc_forwarding; do echo 0> $ i; done
# Disable proxy_arp.
for i in / proc/sys/net/ipv4/conf / * / proxy_arp; do echo 0> $ i; done
# Enable secure redirects, ie only accept ICMP redirects for gateways
# Helps against MITM attacks.
for i in / proc/sys/net/ipv4/conf / * / secure_redirects; do echo 1> $ i; done
# Disable bootp_relay
for i in / proc/sys/net/ipv4/conf / * / bootp_relay; do echo 0> $ i; done
# Default policies.
# ————————————————- —————————–
# Drop everything by default.
$ IPTABLES-P INPUT DROP
$ IPTABLES-P FORWARD DROP
$ IPTABLES-P OUTPUT DROP
# Set the nat / mangle / raw tables’ chains to ACCEPT
$ IPTABLES-t nat-P PREROUTING ACCEPT
$ IPTABLES-t nat-P OUTPUT ACCEPT
$ IPTABLES-t nat-P POSTROUTING ACCEPT
$ IPTABLES-t mangle-P PREROUTING ACCEPT
$ IPTABLES-t mangle-P INPUT ACCEPT
$ IPTABLES-t mangle-P FORWARD ACCEPT
$ IPTABLES-t mangle-P OUTPUT ACCEPT
$ IPTABLES-t mangle-P POSTROUTING ACCEPT
# Cleanup.
# ————————————————- —————————–
# Delete all
$ IPTABLES-F
$ IPTABLES-t nat-F
$ IPTABLES-t mangle-F
# Delete all
$ IPTABLES-X
$ IPTABLES-t nat-X
$ IPTABLES-t mangle-X
# Zero all packets and counters.
$ IPTABLES-Z
$ IPTABLES-t nat-Z
$ IPTABLES-t mangle-Z
# Completely disable IPv6.
# ————————————————- —————————–
# Block all IPv6 traffic
# If the ip6tables command is available, try to block all IPv6 traffic.
if test-x $ IP6TABLES; then
# Set the default policies
# Drop everything
$ IP6TABLES-P INPUT DROP 2> / dev / null
$ IP6TABLES-P FORWARD DROP 2> / dev / null
$ IP6TABLES-P OUTPUT DROP 2> / dev / null
# The mangle table can pass everything
$ IP6TABLES-t mangle-P PREROUTING ACCEPT 2> / dev / null
$ IP6TABLES-t mangle-P INPUT ACCEPT 2> / dev / null
$ IP6TABLES-t mangle-P FORWARD ACCEPT 2> / dev / null
$ IP6TABLES-t mangle-P OUTPUT ACCEPT 2> / dev / null
$ IP6TABLES-t mangle-P POSTROUTING ACCEPT 2> / dev / null
# Delete all rules.
$ IP6TABLES-F 2> / dev / null
$ IP6TABLES-t mangle-F 2> / dev / null
# Delete all chains.
$ IP6TABLES-X 2> / dev / null
$ IP6TABLES-t mangle-X 2> / dev / null
# Zero all packets and counters.
$ IP6TABLES-Z 2> / dev / null
$ IP6TABLES-t mangle-Z 2> / dev / null
fi
# Custom user-defined chains.
# ————————————————- —————————–
# LOG packets, then ACCEPT.
$ IPTABLES-N ACCEPTLOG
$ IPTABLES-A ACCEPTLOG-j $ LOG $ RLIMIT – log-prefix “ACCEPT”
$ IPTABLES-A ACCEPTLOG-j ACCEPT
# LOG packets, then DROP.
$ IPTABLES-N DROPLOG
$ IPTABLES-A DROPLOG-j $ LOG $ RLIMIT – log-prefix “DROP”
$ IPTABLES-A DROPLOG-j DROP
# LOG packets, then REJECT.
# TCP packets are rejected with a TCP reset.
$ IPTABLES-N REJECTLOG
$ IPTABLES-A REJECTLOG-j $ LOG $ RLIMIT – log-prefix “REJECT”
$ IPTABLES-A REJECTLOG-p tcp-j REJECT – reject-with tcp-reset
$ IPTABLES-A REJECTLOG-j REJECT
# Only allows RELATED ICMP types
# (Destination-unreachable, time-exceeded, and parameter-problem).
# TODO: Rate-limit this traffic?
# TODO: Allow fragmentation-needed?
# TODO: Test.
$ IPTABLES-N RELATED_ICMP
$ IPTABLES-A RELATED_ICMP-p icmp – icmp-type destination-unreachable-j ACCEPT
$ IPTABLES-A RELATED_ICMP-p icmp – icmp-type time-exceeded-j ACCEPT
$ IPTABLES-A RELATED_ICMP-p icmp – icmp-type parameter-problem-j ACCEPT
$ IPTABLES-A RELATED_ICMP-j DROPLOG
# Make It Even Harder To Multi-PING
$ IPTABLES-A INPUT-p icmp-m limit – limit 1 / s – limit-burst 2-j ACCEPT
$ IPTABLES-A INPUT-p icmp-m limit – limit 1 / s – limit-burst 2-j LOG – log-prefix PING-DROP:
$ IPTABLES-A INPUT-p icmp-j DROP
$ IPTABLES-A OUTPUT-p icmp-j ACCEPT
# Only allow the minimally required / recommended parts of ICMP. Block the rest.
# ————————————————- —————————–
# TODO: This section needs a lot of testing!
# First, drop all fragmented ICMP packets (almost always malicious).
$ IPTABLES-A INPUT-p icmp – fragment-j DROPLOG
$ IPTABLES-A OUTPUT-p icmp – fragment-j DROPLOG
$ IPTABLES-A FORWARD-p icmp – fragment-j DROPLOG
# Allow all ESTABLISHED ICMP traffic.
$ IPTABLES-A INPUT-p icmp-m state – state ESTABLISHED-j ACCEPT $ RLIMIT
$ IPTABLES-A OUTPUT-p icmp-m state – state ESTABLISHED-j ACCEPT $ RLIMIT
# Allow some parts of the RELATED ICMP traffic, block the rest.
$ IPTABLES-A INPUT-p icmp-m state – state RELATED-j RELATED_ICMP $ RLIMIT
$ IPTABLES-A OUTPUT-p icmp-m state – state RELATED-j RELATED_ICMP $ RLIMIT
# Allow incoming ICMP echo requests (ping), but only rate-limited.
$ IPTABLES-A INPUT-p icmp – icmp-type echo-request-j ACCEPT $ RLIMIT
# Allow outgoing ICMP echo requests (ping), but only rate-limited.
$ IPTABLES-A OUTPUT-p icmp – icmp-type echo-request-j ACCEPT $ RLIMIT
# Drop any other ICMP traffic.
$ IPTABLES-A INPUT-p icmp-j DROPLOG
$ IPTABLES-A OUTPUT-p icmp-j DROPLOG
$ IPTABLES-A FORWARD-p icmp-j DROPLOG
# Selectively allow certain special types of traffic.
# ————————————————- —————————–
# Allow loopback interface to do anything.
$ IPTABLES-A INPUT-i lo-j ACCEPT
$ IPTABLES-A OUTPUT-o lo-j ACCEPT
# Allow incoming connections related to existing allowed connections.
$ IPTABLES-A INPUT-m state – state ESTABLISHED, RELATED-j ACCEPT
# Allow outgoing connections EXCEPT invalid
$ IPTABLES-A OUTPUT-m state – state NEW, ESTABLISHED, RELATED-j ACCEPT
# Miscellaneous.
# ————————————————- —————————–
# We don’t care about Milkosoft, Drop SMB / CIFS / etc ..
$ IPTABLES-A INPUT-p tcp-m multiport – dports 135,137,138,139,445,1433,1434-j DROP
$ IPTABLES-A INPUT-p udp-m multiport – dports 135,137,138,139,445,1433,1434-j DROP
# Explicitly drop invalid incoming traffic
$ IPTABLES-A INPUT-m state – state INVALID-j DROP
# Drop invalid outgoing traffic, too.
$ IPTABLES-A OUTPUT-m state – state INVALID-j DROP
# If we would use NAT, INVALID packets would pass – BLOCK them anyways
$ IPTABLES-A FORWARD-m state – state INVALID-j DROP
# PORT Scanners (stealth also)
$ IPTABLES-A INPUT-m state – state NEW-p tcp – tcp-flags ALL ALL-j DROP
$ IPTABLES-A INPUT-m state – state NEW-p tcp – tcp-flags ALL NONE-j DROP
# TODO: Some more anti-spoofing rules? For example:
# $ IPTABLES-A INPUT-p tcp – tcp-flags ALL FIN, URG, PSH-j DROP
# $ IPTABLES-A INPUT-p tcp – tcp-flags SYN, RST SYN, RST-j DROP
# $ IPTABLES-A INPUT-p tcp – tcp-flags SYN, FIN SYN, FIN-j DROP
$ IPTABLES-N SYN_FLOOD
$ IPTABLES-A INPUT-p tcp – syn-j SYN_FLOOD
$ IPTABLES-A SYN_FLOOD-m limit – limit 2 / s – limit-burst 6-j RETURN
$ IPTABLES-A SYN_FLOOD-j DROP
# TODO: Block known-bad IPs (see http://www.dshield.org/top10.php).
# $ IPTABLES-A INPUT-s INSERT-BAD-IP-HERE-j DROPLOG
# Drop any traffic from IANA-reserved IPs.
# ————————————————- —————————–
$ IPTABLES-A INPUT-s 0.0.0.0 / 7-j DROP
$ IPTABLES-A INPUT-s 2.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 5.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 7.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 10.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 23.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 27.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 31.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 36.0.0.0 / 7-j DROP
$ IPTABLES-A INPUT-s 39.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 42.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 49.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 50.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 77.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 78.0.0.0 / 7-j DROP
$ IPTABLES-A INPUT-s 92.0.0.0 / 6-j DROP
$ IPTABLES-A INPUT-s 96.0.0.0 / 4-j DROP
$ IPTABLES-A INPUT-s 112.0.0.0 / 5-j DROP
$ IPTABLES-A INPUT-s 120.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 169.254.0.0/16-j DROP
$ IPTABLES-A INPUT-s 172.16.0.0/12-j DROP
$ IPTABLES-A INPUT-s 173.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 174.0.0.0 / 7-j DROP
$ IPTABLES-A INPUT-s 176.0.0.0 / 5-j DROP
$ IPTABLES-A INPUT-s 184.0.0.0 / 6-j DROP
$ IPTABLES-A INPUT-s 192.0.2.0/24-j DROP
$ IPTABLES-A INPUT-s 197.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 198.18.0.0/15-j DROP
$ IPTABLES-A INPUT-s 223.0.0.0 / 8-j DROP
$ IPTABLES-A INPUT-s 224.0.0.0 / 3-j DROP
# Selectively allow certain outbound connections, block the rest.
# ————————————————- —————————–
# Allow outgoing DNS requests. Few things will work without this.
$ IPTABLES-A OUTPUT-m state – state NEW-p udp – dport 53-j ACCEPT
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 53-j ACCEPT
# Allow outgoing HTTP requests. Unencrypted, use with care.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 80-j ACCEPT
# Allow outgoing HTTPS requests.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 443-j ACCEPT
# Allow outgoing SMTPS requests. Do NOT allow unencrypted SMTP!
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 465-j ACCEPT
# Allow outgoing “submission” (RFC 2476) requests.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 587-j ACCEPT
# Allow outgoing POP3S requests.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 995-j ACCEPT
# Allow outgoing SSH requests.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 22-j ACCEPT
# Allow outgoing FTP requests. Unencrypted, use with care.
$ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 21-j ACCEPT
# Allow outgoing NNTP requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 119-j ACCEPT
# Allow outgoing NTP requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p udp – dport 123-j ACCEPT
# Allow outgoing IRC requests. Unencrypted, use with care.
# Note: This usually needs the ip_conntrack_irc kernel module.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 6667-j ACCEPT
# Allow outgoing requests to various proxies. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 8080-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 8090-j ACCEPT
# Allow outgoing DHCP requests. Unencrypted, use with care.
# TODO: This is completely untested, I have no idea whether it works!
# TODO: I think this can be tightened a bit more.
$ IPTABLES-A OUTPUT-m state – state NEW-p udp – sport 67:68 – dport 67:68-j ACCEPT
# Allow outgoing CVS requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 2401-j ACCEPT
# Allow outgoing MySQL requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 3306-j ACCEPT
# Allow outgoing SVN requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 3690-j ACCEPT
# Allow outgoing PLESK requests. Unencrypted, use with care.
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 8443-j ACCEPT
# Allow outgoing Tor (http://tor.eff.org) requests.
# Note: Do _not_ use unencrypted protocols over Tor (sniffing is possible)!
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9001-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9002-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9030-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9031-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9090-j ACCEPT
# $ IPTABLES-A OUTPUT-m state – state NEW-p tcp – dport 9091-j ACCEPT
# Allow outgoing OpenVPN requests.
$ IPTABLES-A OUTPUT-m state – state NEW-p udp – dport 1194-j ACCEPT
# TODO: ICQ, MSN, GTalk, Skype, Yahoo, etc …
# Selectively allow certain inbound connections, block the rest.
# ————————————————- —————————–
# Allow incoming DNS requests.
$ IPTABLES-A INPUT-m state – state NEW-p udp – dport 53-j ACCEPT
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 53-j ACCEPT
# Allow incoming HTTP requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 80-j ACCEPT
# Allow incoming HTTPS requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 443-j ACCEPT
# Allow incoming POP3 requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 110-j ACCEPT
# Allow incoming IMAP4 requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 143-j ACCEPT
# Allow incoming POP3S requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 995-j ACCEPT
# Allow incoming SMTP requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 25-j ACCEPT
# Allow incoming SSH requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 22-j ACCEPT
# Allow incoming FTP requests.
$ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 21-j ACCEPT
# Allow incoming NNTP requests.
# $ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 119-j ACCEPT
# Allow incoming MySQL requests.
# $ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 3306-j ACCEPT
# Allow incoming PLESK requests.
# $ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 8843-j ACCEPT
# Allow incoming BitTorrent requests.
# TODO: Are these already handled by ACCEPTing established / related traffic?
# $ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 6881-j ACCEPT
# $ IPTABLES-A INPUT-m state – state NEW-p udp – dport 6881-j ACCEPT
# Allow incoming nc requests.
# $ IPTABLES-A INPUT-m state – state NEW-p tcp – dport 2030-j ACCEPT
# $ IPTABLES-A INPUT-m state – state NEW-p udp – dport 2030-j ACCEPT
# Explicitly log and reject everything else.
# ————————————————- —————————–
# Use REJECT instead of REJECTLOG if you don’t need / want logging.
$ IPTABLES-A INPUT-j REJECTLOG
$ IPTABLES-A OUTPUT-j REJECTLOG
$ IPTABLES-A FORWARD-j REJECTLOG
# ————————————————- —————————–
# Testing the firewall.
# ————————————————- —————————–
# You should check / test that the firewall really works, using
# Iptables-vnL, nmap, ping, telnet, …
# Exit gracefully.
# ————————————————- —————————–
exit 0
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