Lab 3: Recon and Firewalls
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1 Lab 3: Recon and Firewalls
2 IP, UDP, TCP and ICMP Before we can create firewall rules, we have to know the basics of network protocols. Here's a quick review... IP ICMP UDP TCP The underlying packet delivery protocol Error messages, network book keeping and more Connectionless and unreliable Connections, reliable and sequenced
3 TCP 3-Way Handshake TCP requires that both computers track the state of all connections. Here's how TCP connections are established. This is important to know when writing firewall rules. Client SYN SYN,ACK Server ACK
4 Our Playground Network Internet Attacker Firewall Victim
5 NMap Nmap is one of the most commonly used network scanners used today. It's commonly used for: Mapping hosts on networks Identifying a host's OS Locating and identifying network services
6 NMap Here's a common way that nmap is used to probe a network nmap -A -ss -sr -p /24 -A same as -O -sv which give OS detection and service version probing -ss TCP SYN-only scan -sr identify any RPC services -p1- probe all ports (TCP only in this case) There are a lot more command line switches for nmap.
7 Exercise #1: Mapping Networks Use Nmap to map out the hosts on the victim network: 1. Map out the hosts on the network: nmap -sp /24 2. Scan the hosts in more detail. Do this for each host that answered: nmap X 3. Scan the hosts in even more detail. Do this for at least one host: nmap -A -sv -p x 4. Examine the logs on the scanned hosts: less /var/log/messages
8 Why Do This? A lot of information can be collected by just scanning: Open ports Operating system identification Service versions Even the existence of hosts Firewalls are about the easiest and most commonly used methods for stopping or reducing this type of information gathering.
9 Firewalls Firewalls can be classified into three types: Stateless Stateful Proxy There are other features that are orthogonal to these classifications: NAT/PAT Port Redirection (RDR) Bridging
10 pfsense Based on FreeBSD with PF, pfsense is a very easy to use but still feature-rich firewalling systems available today. pfsense is also capable of: Captive Portal Wireless authentication (WPA) Terminating VPN connections Load Balancing Priority Queuing (through ALTQ) Failover (through CARP) Some proxy support Supports external packages (e.g. snort, pfflowd, squid, etc) On reasonable hardware, it will easily preform as well as mid-sized commercial products.
11 Exercise #2: Blocking Packets 1.Open a browser on the victim and point it at 2.Select the Firewall tab and then Rules 3.Disable the one rule that passes all traffic 4.Apply the changes 5.Now go back and repeat the same scans from Exercise #1
12 Exercise #3: Allow Some Access This type of "one-way gate" is useful, but is not a perfect solution since we probably want to allow some inbound connections. Let's punch some holes in this firewall to allow needed services: 1.Go back to Firewall -> Rules 2.Add a new rule allowing the following: protocol TCP source any destination IP (this is Victim) destination port 80 3.Repeat the last scan from Exercise #1 against
13 Firewall Rule Design Philosophies There are several major philosophies regarding the design of firewall rules: Organic Mostly Open Mostly Closed Paranoid Really Paranoid Grow as you go "Allow All" rules and block traffic as necessary "Block All" rules and allow traffic as necessary "Mostly Closed" and find ways to not punch holes Don't connect the computers to a network
14 Nessus Another common network reconnaissance tool is Nessus. Whereas Nmap scans for open ports and maybe does a small amount of service probing, Nessus runs "plugins" that collect information and can try to identify and even exploit real vulnerabilities.
15 Exercise #4: Nessus 1.Start the nessus daemon on Attacker: sudo /bin/sh /usr/local/etc/rc.d/nessus start 2.Start the nessus client: nessus 3.Connect to the local nessus daemon: Nessusd Host localhost Port 1241 Login attacker Password attacker 4.Enable all plugins 5.Target /24 6.Start the scan and wait for the results
16 Questions?
17 Lab 3: Recon and Firewalls
18 IP, UDP, TCP and ICMP Before we can create firewall rules, we have to know the basics of network protocols. Here's a quick review... IP ICMP UDP TCP The underlying packet delivery protocol Error messages, network book keeping and more Connectionless and unreliable Connections, reliable and sequenced
19 TCP3-WayHandshake
20 OurPlaygroundNetwork Atacker Internet Firewal Victim 172 l
21 NMapNmapisoneofthemostcomonlyu It'scomonlyusedfor:MapinghostsonetworksIdentifyingahost'sOSLocatingandidentifyingnetworks sednetworkscanersusedtoday. ervices
22 NMapHere'sacomonwaythatnmapisu nmap-a-ss-sr-p Asameas-O-sVwhichgiveO -sstcpsyn-onlyscan sedtoprobeanetwork /24 Sdetectionandserviceversionprobing -sridentifyanyrpcservices-p1-probealports(tcponlyint Therearealotmorecomandlines witchesfornmap. hiscase)
23 Exercise#1:MapingNetworksUseNmaptomapouthehostsonth 1. Mapouthehostsonthenetwork nmap-sp /2 Scanthehostsinmoredetail.Do evictimnetwork: 4thisforeachosthatanswered: nmap x3. Scanthehostsinevenmoredeta nmap-a-sv-p Examinethelogsonthescaned les/var/log/mesages il.dothisforatleastonehost: 6.10.X hosts:
24 WhyDoThis?Alotofinformationcanbecolected OpenportsOperatingsystemidentificationServiceversionsEventhexistenceofhosts byjustscaning: Firewalsareaboutheasiestandm stopingoreducingthistypeofinfo ostcomonlyusedmethodsfor rmationgathering.
25 FirewalsFirewalscanbeclasifiedintothre StatelesStatefulProxyThereareotherfeaturesthatareortho NAT/PATPortRedirection(RDR)Bridging gonaltotheseclasifications: types:
26 pfsensebasedonfrebsdwithpf,pfsenseisa firewalingsystemsavailabletoday.pfse CaptivePortalWirelesauthentication(WPA)TerminatingVPNconectionsLoadBalancingPriorityQueuing(throughALTQ) veryeasytousebutstilfeature-rich nseisalsocapableof: Failover(throughCARP)SomeproxysuportSuportsexternalpackages(e.g.snort, Onreasonablehardware,itwileasilypre products. formaswelasmid-sizedcomercial pflowd,squid,etc)
27 Exercise#2:BlockingPackets1.Openabrowseronthevictimand 2.SelectheFirewaltabandthenR 3.Disabletheonerulethatpasesal 4.Aplythechanges5.Nowgobackandrepeathesame pointitathtp:/ ules ltrafic scansfromexercise#1
28 Exercise#3:AlowSomeAcesThistypeof"one-waygate"isuseful probablywantoalowsomeinbound Let'spunchsomeholesinthisfirewa, butisnotaperfectsolutionsincewe ltoalownededservices: conections. 1.GobacktoFirewal->Rules2.Adanewrulealowingthefolo protocoltcpsourceanydestinationip destinationport803.repeathelastscanfromexercis.10(thisisvictim) wing: e#1against
29 RuleDesignPhilosophiesThereareseveralmajorphilosophies Firewal OrganicGrowasyougoMostlyOpen"AlowAl"rules MostlyClosed"BlockAl"rules Paranoid"MostlyClosed" andfindwaystonotpuncholes regardingthedesignofirewalrules: andblocktraficasnecesary andalowtraficasnecesary RealyParanoidDon'tconecthe computerstoanetwork
30 NesusAnothercomonetworkreconais scansforopenportsandmaybedoes Nesusruns"plugins"thatcolectinf evenexploitrealvulnerabilities. ancetolisnesus.whereasnmap asmalamountofserviceprobing, ormationandcantrytoidentifyand
31 Exercise#4:Nesus1.StarthenesusdaemononAtack sudo/bin/sh/usr/loca 2.Starthenesusclient:nesus3.Conectothelocalnesusdaemo NesusdHostlocalhostPort1241 er: l/etc/rc.d/nesustart n: LoginatackerPaswordatacker4.Enablealplugins5.Target /246.Starthescanandwaitfortheresu lts
32 Questions?
Port Scanning and Vulnerability Assessment. ECE4893 Internetwork Security Georgia Institute of Technology
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