assignmet2
This commit is contained in:
Vasco
45
assignment1/DMZ.sh
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assignment1/DMZ.sh
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# ==============================
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# DMZ
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# NETWORK: 23.214.219.128/25
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# ==============================
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ip=23.214.219.129
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routerIp=23.214.219.254
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mask25=255.255.255.128
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dns=23.214.219.130
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mail=23.214.219.134
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vpn_gw=23.214.219.133
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www=23.214.219.132
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smtp=23.214.219.131
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dnsPort=53
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mailPort=888
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vpn_gwPort=443
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wwwPort=587
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smtpPort=80
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sudo yum install iptables-services -y
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sudo systemctl stop firewalld
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sudo systemctl disable firewalld
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sudo systemctl mask firewalld
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sudo systemctl enable iptables
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sudo iptables -F
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sudo ifconfig enp0s8 $ip netmask $mask25
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sudo ip route add 192.168.10.0/24 via $routerIp
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sudo route add default gw $routerIp
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# alias dos ips
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sudo ip addr add $dns dev enp0s8
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sudo ip addr add $mail dev enp0s8
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sudo ip addr add $vpn_gw dev enp0s8
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sudo ip addr add $www dev enp0s8
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sudo ip addr add $smtp dev enp0s8
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# netcart
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internalIp=192.168.10.1
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nc -l &
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nc -v -s $dns -p $dnsPort $internalIp
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nc -v -s $mail -p $mailPort $internalIp
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nc -v -s $vpn_gw -p $vpn_gwPort $internalIp
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nc -v -s $smtp -p $smtpPort $internalIp
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nc -v -s $www -p $wwwPort $internalIp
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nc -v -s $www -p $wwwPort $internalIp
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30
assignment1/INTERNAL.sh
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assignment1/INTERNAL.sh
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# ==============================
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# INTERNAL
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# NETWORK: 192.168.10.0/24
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# ==============================
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ip=192.168.10.1
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routerIp=192.168.10.254
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mask24=255.255.255.0
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ftp=192.168.10.2
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datastore=192.168.10.3
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dhcpClient=192.168.10.4
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sudo yum install iptables-services -y
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sudo systemctl stop firewalld
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sudo systemctl disable firewalld
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sudo systemctl mask firewalld
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sudo systemctl enable iptables
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sudo iptables -F
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sudo ifconfig enp0s8 $ip netmask $mask24
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sudo ip route add 23.214.219.128/25 via $routerIp
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sudo route add default gw $routerIp
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# aliasing
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sudo ip addr add $ftp dev enp0s8
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sudo ip addr add $datastore dev enp0s8
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# netcar
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dmz=23.214.219.129
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nc -l &
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nc -v -s $ftp -p 53 $dmz
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nc -v -s $datastore -p 888 $dmz
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15
assignment1/INTERNET.sh
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assignment1/INTERNET.sh
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ip=87.248.214.98
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dns2=87.248.214.99
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eden=87.248.214.100
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mask24=255.255.255.0
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routerIp=87.248.214.97
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sudo yum install iptables-services -y
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sudo systemctl stop firewalld
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sudo systemctl disable firewalld
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sudo systemctl mask firewalld
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sudo systemctl enable iptables
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sudo iptables -F
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sudo ifconfig enp0s8 $dns2 netmask $mask24
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sudo route add default gw $routerIp
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#sudo ip addr add $dns2 dev enp0s8
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sudo ip addr add $eden dev enp0s8
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BIN
assignment1/Practical Assignment 1.pdf
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assignment1/Practical Assignment 1.pdf
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assignment1/ROUTER.sh
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assignment1/ROUTER.sh
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#!/bin/bash
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dns2="87.248.214.99"
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eden="87.248.214.100"
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# Router 1
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dmzIP="23.214.219.254"
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internalIP="192.168.10.254"
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externalIP="87.248.214.97"
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# DMZ /25
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dns="23.214.219.130"
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smtp="23.214.219.131"
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www="23.214.219.132"
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vpn_gw="23.214.219.133"
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mail="23.214.219.134"
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# Internal
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ftp="192.168.10.2"
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datastore="192.168.10.3"
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dhcpClient="192.168.10.4"
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# Interfaces
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dmzIF="enp0s8"
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internalIF="enp0s9"
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externalIF="enp0s10"
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sudo ifconfig $dmzIF $dmzIP netmask 255.255.255.128
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sudo ifconfig $internalIF $internalIP netmask 255.255.255.0
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sudo ifconfig $externalIF $externalIP netmask 255.255.255.0
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sudo yum install iptables-services -y
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sudo systemctl stop firewalld
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sudo systemctl disable firewalld
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sudo systemctl mask firewalld
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sudo systemctl enable iptables
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sudo iptables -F
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sudo iptables -t nat -F
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sudo iptables -t mangle -F
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sudo sysctl -w net.ipv4.ip_forward=1
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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iptables -P OUTPUT ACCEPT
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sudo iptables -A INPUT -i lo -j ACCEPT
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sudo iptables -A OUTPUT -o lo -j ACCEPT
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#sudo iptables -t nat -A POSTROUTING -i $internalIF -o enp0s3 -j MASQUERADE #SUS
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sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT #CAREFULL
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#DNS name resolution requests sent to outside servers and want a response:
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sudo iptables -A INPUT -i $externalIF -p udp --dport 53 -j ACCEPT
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#SSH connections to the router system that originate from the inside and want an answer:
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sudo iptables -A INPUT -i $internalIF -p tcp --dport 22 -j ACCEPT
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sudo iptables -A INPUT -i $dmzIF -s $vpn_gw -p tcp --dport 22 -j ACCEPT
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#The dns server should be able to resolve names using the internet (and others???)
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sudo iptables -I FORWARD -j NFQUEUE --queue-bypass
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sudo iptables -I INPUT -j NFQUEUE --queue-bypass
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sudo iptables -A FORWARD -i $dmzIF -o $externalIF -s $dns -p udp --dport 53 -j ACCEPT
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#The internal network should be able to send and recieve dns name resolutions to the dns server (1!)
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $dns -p udp --dport 53 -j ACCEPT
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sudo iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT #THIS IS IMPORTANT AND MIGHT FUCK US
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#The dns and dns2 servers should be able to synchronize the contents of DNS zones. (protocol tcp port 53)
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sudo iptables -A FORWARD -i $dmzIF -o $externalIF -s $dns -p tcp --dport 53 -j ACCEPT
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#SMTP connections to the smtp server and returns
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $smtp -p tcp --dport 587 -j ACCEPT
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#sudo iptables -A FORWARD -i $dmzIF -o $internalIF -p tcp --dport 587 -m state --state ESTABLISHED,RELATED -j ACCEPT
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#POP and IMAP connections to the www server
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $mail -p tcp --dport 143 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $mail -p tcp --dport 110 -j ACCEPT
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#HTTP and HTTPS connectins
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $www -p tcp --dport 80 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $www -p tcp --dport 443 -j ACCEPT
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#OpenVPN connections to the vpn-gw server
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sudo iptables -A FORWARD -i $internalIF -o $dmzIF -d $vpn_gw -p udp --dport 1194 -j ACCEPT
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#sudo iptables -A FORWARD -i $dmzIF -o $internalIF -p udp --dport 1194 -j ACCEPT
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#VPN clients connected to the gateway vpn-gw ???? vpn should be able to acess ftp e datastore
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sudo iptables -A FORWARD -i $dmzIF -o $internalIF -s $vpn_gw -d $ftp -j ACCEPT
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sudo iptables -A FORWARD -i $dmzIF -o $internalIF -s $vpn_gw -d $datastore -j ACCEPT
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#FTP da internet WORRIED ???
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sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $ftp -p tcp --dport 21 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --sport 20 -j ACCEPT #MIGHT BE NEEDED
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#SSH CONNECTIONS datastore server but only from eden or dn2 DNAT -s servers, and port and -d interface
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sudo iptables -t nat -A PREROUTING -s $dns2 -p tcp --dport 22 -j DNAT --to-destination $datastore
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sudo iptables -t nat -A PREROUTING -s $eden -p tcp --dport 22 -j DNAT --to-destination $datastore
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sudo iptables -t nat -A PREROUTING -i $externalIF -p tcp --dport 21 -j DNAT --to-destination $ftp
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sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $datastore -s $dns2 -p tcp --dport 22 -j ACCEPT #Need to check and make diferent ip addresses
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sudo iptables -A FORWARD -i $externalIF -o $internalIF -d $datastore -s $eden -p tcp --dport 22 -j ACCEPT
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#$internalIF to internet DNS, http, https, ssh, FTP(SERVERS??????(WHO INVITED THIS GUY)) SNAT
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sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o $externalIF -j SNAT --to-source $externalIP
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p udp --dport 53 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 80 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 443 -j ACCEPT
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --sport 21 -j ACCEPT #MIGHT NOT BE ENOUGH
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sudo iptables -A FORWARD -i $internalIF -o $externalIF -p tcp --dport 21 -j ACCEPT
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assignment1/entrega.zip
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assignment1/entrega.zip
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assignment1/entrega.zip.asc
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assignment1/entrega.zip.asc
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assignment1/relatorio.aux
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assignment1/relatorio.aux
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\relax
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\providecommand \babel@aux [2]{\global \let \babel@toc \@gobbletwo }
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\@nameuse{bbl@beforestart}
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\catcode `"\active
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\babel@aux{portuguese}{}
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\@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{2}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {section}{\numberline {2}Firewall}{2}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {subsection}{\numberline {2.1}Packet fileter without NAT}{2}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Packet filtering with NAT}{3}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {section}{\numberline {3}Intrusion Detection}{4}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {section}{\numberline {4}Tests utilizados}{5}{}\protected@file@percent }
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\@writefile{toc}{\contentsline {section}{\numberline {5}Conclusion}{5}{}\protected@file@percent }
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\gdef \@abspage@last{5}
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assignment1/relatorio.log
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assignment1/relatorio.log
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This is pdfTeX, Version 3.141592653-2.6-1.40.27 (TeX Live 2026/dev/Arch Linux) (preloaded format=pdflatex 2026.1.17) 22 MAR 2026 22:27
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entering extended mode
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\write18 enabled.
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%&-line parsing enabled.
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**/home/vasco/EngenhariaInformatica/3ano/sem2/fsi/trabalho/relatorio
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(/home/vasco/EngenhariaInformatica/3ano/sem2/fsi/trabalho/relatorio.tex
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\bibindent=\dimen141
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\OT1/EBGaramond-LF/m/n/12 As tr[]es re-des tem va-rios servi[]os, o DMZ tem dns
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(23.214.219.130), mail(23.214.219.134),
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\OT1/EBGaramond-LF/m/n/12 Ao realizar-mos este pro-jeto apren-de-mos so-bre a c
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ria[][]ao de sce-na-rios em VMs, a configura[][]ao
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[]
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[5] (/home/vasco/EngenhariaInformatica/3ano/sem2/fsi/trabalho/relatorio.aux)
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assignment1/relatorio.pdf
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assignment1/relatorio.tex
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\documentclass[12pt,a4paper]{article}
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\usepackage[portuguese]{babel}
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\usepackage[lining]{ebgaramond}
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\usepackage{listings}
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tabsize=2
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}
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\lstset{style=mystyle}
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\title{Practical Assignment \#1}
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\author{
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João Neto -- 2023234004\\[1em]
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Vasco Alves -- 2022228207
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}
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\begin{document}
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\maketitle
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\tableofcontents
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\newpage
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||||
\section{Introduction}
|
||||
O objetivo principal deste trabalho era aprender IPTables e como configurar um com o Suricata um sistema de filtração e deteção de ataques. Para esse fim, foi simulado um sistema dividido em três redes e um router para conectar-las. As três redes são a DMZ (23.214.219.128/25, enp0s8), Internal network (192.168.10.0/24, enp0s9) e Internet (87.248.214.0/24, enp0s10).
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\begin{lstlisting}[language=bash]
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Rede,Interface,Gama IP
|
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DMZ,enp0s8,23.214.219.128/25
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Internal,enp0s9,192.168.10.0/24
|
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Internet,enp0s10,87.248.214.0/24
|
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\end{lstlisting}
|
||||
As três redes tem varios serviços, o DMZ tem dns(23.214.219.130), mail(23.214.219.134), vpn-gw(23.214.219.133), www(23.214.219.132) e smpt(23.214.219.131). A Internal network tem ftp(192.168.10.2), datastore(192.168.10.3) e clientes (nos testes os clientes tem ip 192.168.10.4, mas está configurado para dar para qualquer edereço). Por fim a rede Internet tem dns2 (87.248.214.99) e eden (87.248.214.100), existe também outros serviços (87.248.214.98).
|
||||
Para facilitar a recriação deste sistema foi criado 4 ficheiros .sh (um para cada rede e o router), e disponibilizamos os ficheiros suricata.rules e suricata.yaml, para o suricata que estiver ligado ao Router. Os ficheiros .sh vão ter comandos para configurar o sistema para este exercicio.
|
||||
\section{Firewall}
|
||||
\subsection{Packet fileter without NAT}
|
||||
O policy que foi escolhido foi:
|
||||
\begin{lstlisting}[language=bash]
|
||||
iptables -P INPUT DROP
|
||||
iptables -P FORWARD DROP
|
||||
iptables -P OUTPUT ACCEPT
|
||||
\end{lstlisting}
|
||||
Foi escolhido porque é mais facil dar DROP a todos os pacotes que não foi criado regras do que criar uma regra de DROP para todos os protocolos e possibilidades, o OUTPUT ficou para ACCEPT porque não existe razão para dar DROP dos pacotes que estamos a enviar neste trabalho.
|
||||
Para o router conseguir resolver DNS requests e para aceitar coneções SSH da rede interna ou da VPN gateway foi utilizado estes comandos:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -A INPUT -i enp0s10 -p udp --dport 53 -j ACCEPT
|
||||
sudo iptables -A INPUT -i enp0s9 -p tcp --dport 22 -j ACCEPT
|
||||
sudo iptables -A INPUT -i enp0s8 -s 23.214.219.133 -p tcp --dport 22 -j ACCEPT
|
||||
\end{lstlisting}
|
||||
Para conseguirmos a confirguração pedida entre redes foi utilizado estes commandos:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p udp --dport 53 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.130 -p udp --dport 53 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s8 -o enp0s10 -s 23.214.219.130 -p tcp --dport 53 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.131 -p tcp --dport 587 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.134 -p tcp --dport 143 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.134 -p tcp --dport 110 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 80 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 443 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.133 -p udp --dport 1194 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.2 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s8 -o enp0s9 -s 23.214.219.133 -d 192.168.10.3 -j ACCEPT
|
||||
\end{lstlisting}
|
||||
Inicialmente as implementações de respostas a forward eram especificas para cada regra isto é por exemplo:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -A FORWARD -o enp0s8 -i enp0s10 -p udp --dport 53 -m state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
\end{lstlisting}
|
||||
No entanto isso facilmente originava confusão entre nós, então decimos utilizar estas duas regras:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
sudo iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
|
||||
\end{lstlisting}
|
||||
Neste cenario o uso destas regras faz sentido, mas pode existir outros cenarios no futuro que não queremos uma resposta, e nesse caso temos de criar as regras necessarias.
|
||||
\subsection{Packet filtering with NAT}
|
||||
Para conecções com origem/destino na internet foi utilizado DNAT/SNAT e iptables para "esconder" o ip para a internet que querer aceder a rede interna para não terem acesso ao edereço ip e iproutes para bloquear certos pacotes de entrar, para conseguir a configuração utilizamos estes comandos:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.2 -p tcp --dport 21 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 20 -j ACCEPT
|
||||
sudo iptables -t nat -A PREROUTING -s $dns2 -p tcp --dport 22 -j DNAT --to-destination 192.168.10.3
|
||||
sudo iptables -t nat -A PREROUTING -s $eden -p tcp --dport 22 -j DNAT --to-destination 192.168.10.3
|
||||
sudo iptables -t nat -A PREROUTING -i enp0s10 -p tcp --dport 21 -j DNAT --to-destination 192.168.10.2
|
||||
sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $dns2 -p tcp --dport 22 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.3 -s $eden -p tcp --dport 22 -j ACCEPT
|
||||
sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 -o enp0s10 -j SNAT --to-source 87.248.214.97
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p udp --dport 53 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 80 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 443 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --sport 21 -j ACCEPT
|
||||
sudo iptables -A FORWARD -i enp0s9 -o enp0s10 -p tcp --dport 21 -j ACCEPT
|
||||
\end{lstlisting}
|
||||
|
||||
\section{Intrusion Detection}
|
||||
As regras que utilizamos para o suricata foram estas:
|
||||
\begin{lstlisting}[language=bash]
|
||||
drop tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET"; flags:S; threshold:type both, track by_src, count 5, seconds 60; classtype:attempted-recon; sid:1000001; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"SQL injection"; content:"union"; nocase; content:"select"; nocase; classtype:web-application-attack; sid:1000002; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"SQl injection"; content:"'or 1=1"; nocase; classtype:web-application-attack; sid:1000003; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"XSS"; content:"<script"; nocase; classtype:web-application-attack; sid:1000004; rev:1;)
|
||||
\end{lstlisting}
|
||||
A primeira é para port scaning, a segunda e a terceira é para o caso de SQL injection, e a ultima é para XSS atacks.
|
||||
Também atualizamos o iptables para passar para o suricata os pacotes para analizar e bloquear com:
|
||||
\begin{lstlisting}[language=bash]
|
||||
sudo iptables -I FORWARD -j NFQUEUE --queue-bypass
|
||||
sudo iptables -I INPUT -j NFQUEUE --queue-bypass
|
||||
\end{lstlisting}
|
||||
|
||||
\section{Tests utilizados}
|
||||
Netcat foi utilizado para maior parte dos testes excepto para FTP, em que devido ás suas caracteristicas especificas, utilizamos os serviços para ter a certeza que funcionava com a nossa configuração. Utilizamos estes comandos curl para testar se eram bloqueados:
|
||||
\begin{lstlisting}[language=bash]
|
||||
curl -i "http://23.214.219.132/index.php?id=1%20union%20select%201,2,3"
|
||||
curl -i "http://23.214.219.132/login.php?user='or%201=1"
|
||||
curl -i "http://23.214.219.132/search.php?q=<script>alert('XSS')</script>"
|
||||
\end{lstlisting}
|
||||
|
||||
\section{Conclusion}
|
||||
Ao realizar-mos este projeto aprendemos sobre a criação de scenarios em VMs, a configuração de uma firewall utilizando IPTables e a configuração de um IDS/IPS system utilizando Suricata
|
||||
\end{document}
|
||||
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||||
\babel@toc {portuguese}{}\relax
|
||||
\contentsline {section}{\numberline {1}Introduction}{2}{}%
|
||||
\contentsline {section}{\numberline {2}Firewall}{2}{}%
|
||||
\contentsline {subsection}{\numberline {2.1}Packet fileter without NAT}{2}{}%
|
||||
\contentsline {subsection}{\numberline {2.2}Packet filtering with NAT}{3}{}%
|
||||
\contentsline {section}{\numberline {3}Intrusion Detection}{4}{}%
|
||||
\contentsline {section}{\numberline {4}Tests utilizados}{5}{}%
|
||||
\contentsline {section}{\numberline {5}Conclusion}{5}{}%
|
||||
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assignment1/suricata.rules
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|
||||
drop tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET"; flags:S; threshold:type both, track by_src, count 5, seconds 60; classtype:attempted-recon; sid:1000001; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"SQL injection"; content:"union"; nocase; content:"select"; nocase; classtype:web-application-attack; sid:1000002; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"SQl injection"; content:"'or 1=1"; nocase; classtype:web-application-attack; sid:1000003; rev:1;)
|
||||
drop tcp any any -> any 80 (msg:"XSS"; content:"<script"; nocase; classtype:web-application-attack; sid:1000004; rev:1;)
|
||||
|
||||
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