relatorio

2026-03-22 22:25:47 +00:00
parent 1db4072c19
commit 51c5d2acc1
6 changed files with 154 additions and 86 deletions
--- a/relatorio.aux
+++ b/relatorio.aux
@@ -5,10 +5,9 @@
 \babel@aux{portuguese}{}
 \@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{2}{}\protected@file@percent }
 \@writefile{toc}{\contentsline {section}{\numberline {2}Firewall}{2}{}\protected@file@percent }
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-\@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Packet filtering without NAT}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.3}External Network}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {subsection}{\numberline {2.4}Internal Network}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {section}{\numberline {3}Intrusion Detection}{2}{}\protected@file@percent }
-\@writefile{toc}{\contentsline {section}{\numberline {4}Conclusion}{2}{}\protected@file@percent }
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+\@writefile{toc}{\contentsline {subsection}{\numberline {2.1}Packet fileter without NAT}{2}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Packet filtering with NAT}{3}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {3}Intrusion Detection}{4}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {4}Tests utilizados}{5}{}\protected@file@percent }
+\@writefile{toc}{\contentsline {section}{\numberline {5}Conclusion}{5}{}\protected@file@percent }
+\gdef \@abspage@last{5}
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+\OT1/EBGaramond-LF/m/n/12 As tr[]es re-des tem va-rios servi[]os, o DMZ tem dns
+(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
+ria[][]ao de sce-na-rios em VMs, a configura[][]ao
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+
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--- a/relatorio.pdf
+++ b/relatorio.pdf
--- a/relatorio.synctex.gz
+++ b/relatorio.synctex.gz
--- a/relatorio.tex
+++ b/relatorio.tex
@@ -1,6 +1,23 @@
 \documentclass[12pt,a4paper]{article}
 \usepackage[portuguese]{babel}
 \usepackage[lining]{ebgaramond}
+\usepackage{listings}
+
+\lstdefinestyle{mystyle}{
+    basicstyle=\ttfamily\footnotesize,
+    breakatwhitespace=false,         
+    breaklines=true,                 
+    captionpos=b,                    
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+    numbersep=5pt,                  
+    showspaces=false,                
+    showstringspaces=false,
+    showtabs=false,                  
+    tabsize=2
+}
+
+\lstset{style=mystyle}

 \title{Practical Assignment \#1}
 \author{
@@ -15,31 +32,32 @@

 \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).
-\begin{verbatim}
+
+\begin{lstlisting}[language=bash]
 Rede,Interface,Gama IP
 DMZ,enp0s8,23.214.219.128/25
 Internal,enp0s9,192.168.10.0/24
 Internet,enp0s10,87.248.214.0/24
-\end{verbatim}
+\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{verbatim}
+\begin{lstlisting}[language=bash]
 iptables -P INPUT DROP
 iptables -P FORWARD DROP
 iptables -P OUTPUT ACCEPT
-\end{verbatim}
+\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{verbatim}
+\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{verbatim}
+\end{lstlisting}
 Para conseguirmos a confirguração pedida entre redes foi utilizado estes commandos:
-\begin{verbatim}
+\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
@@ -51,64 +69,57 @@ sudo iptables -A FORWARD -i enp0s9 -o enp0s8 -d 23.214.219.132 -p tcp --dport 44
 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{verbatim}
+\end{lstlisting}
 Inicialmente as implementações de respostas a forward eram especificas para cada regra isto é por exemplo:
-\begin{verbatim}
+\begin{lstlisting}[language=bash]
 sudo iptables -A FORWARD -o enp0s8 -i enp0s10 -p udp --dport 53 -m state --state ESTABLISHED,RELATED -j ACCEPT
-\end{verbatim}
+\end{lstlisting}
 No entanto isso facilmente originava confusão entre nós, então decimos utilizar estas duas regras:
-\begin{verbatim}
+\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{verbatim}
+\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{verbatim}
-sudo iptables -A FORWARD -i enp0s10 -o enp0s9 -d 192.168.10.2 
-p tcp --dport 21 -j ACCEPT
+\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 -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{verbatim}
+\end{lstlisting}

 \section{Intrusion Detection}
 As regras que utilizamos para o suricata foram estas:
-\begin{verbatim}
+\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{verbatim}
+\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{verbatim}
+\begin{lstlisting}[language=bash]
 sudo iptables -I FORWARD -j NFQUEUE --queue-bypass
 sudo iptables -I INPUT -j NFQUEUE --queue-bypass
-\end{verbatim}
+\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{verbatim}
+\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{verbatim}
+\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
--- a/relatorio.toc
+++ b/relatorio.toc
@@ -1,9 +1,8 @@
 \babel@toc {portuguese}{}\relax 
 \contentsline {section}{\numberline {1}Introduction}{2}{}%
 \contentsline {section}{\numberline {2}Firewall}{2}{}%
-\contentsline {subsection}{\numberline {2.1}Packet fileter with NAT}{2}{}%
-\contentsline {subsection}{\numberline {2.2}Packet filtering without NAT}{2}{}%
-\contentsline {subsection}{\numberline {2.3}External Network}{2}{}%
-\contentsline {subsection}{\numberline {2.4}Internal Network}{2}{}%
-\contentsline {section}{\numberline {3}Intrusion Detection}{2}{}%
-\contentsline {section}{\numberline {4}Conclusion}{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}{}%