ft6 Motivation next step: perform the tests usually tedious, error prone work aided by a tool easily repeatable enter ft6 ft6
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1 ft6 Motivation next step: perform the tests usually tedious, error prone work aided by a tool easily repeatable enter ft6 Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 1 von 25
2 ft6 Agenda 1 overview 2 info on design and implementation 3 live demo 4 writing your own tests (optionally) Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 2 von 25
3 ft6 Design Goals easy to configure graphical user interface browse tests and results visual representation Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 3 von 25
4 ft6 Design Goals open-source (Creative Commons BY-NC-SA 3.0) can act as a framework for new tests easy to implement new tests Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 4 von 25
5 ft6 Details powered by python, PyQt and scapy works with Linux, Windows 7, OS X python: rapid developement, easily understandable PyQt: GUI-framework, available cross-platform scapy: great framework for network packet creation Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 5 von 25
6 ft6 Architecture Firewall Client (runs client.py) Server (runs server.py) ft6 is a client-server application requires machines on both sides of your firewall one open port place machines not more than one hop away from firewall Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 6 von 25
7 ft6 Running ft6 Firewall Client (runs client.py) Server (runs server.py) Client and Server exhange control messages Start / End / Results Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 7 von 25
8 ft6 Running ft6 Firewall Client (runs client.py) Server (runs server.py) Client sends packets Server sniffs Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 8 von 25
9 ft6 Running ft6 Firewall Client (runs client.py) Server (runs server.py) Client sends packets Server sniffs Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 9 von 25
10 ft6 Running ft6 Firewall Client (runs client.py) Server (runs server.py) Server sends back list of packets it recieved Client figures out what went missing and displays result Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 10 von 25
11 Handling Network Packets Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 11 von 25
12 ft6 packet creation with scapy handling network packets is usually messy binary protocols accessing individual flags invovles bitshifting or bitmasking sending and receiving is error-prone, too scapy does all that for you and is human readable. great TAB-completion Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 12 von 25
13 ft6 scapy demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 13 von 25
14 ft6 scapy demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 14 von 25
15 ft6 scapy demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 15 von 25
16 ft6 scapy demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 16 von 25
17 ft6 scapy demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 17 von 25
18 Live Demo Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 18 von 25
19 ft6 Writing your own test Example: build own test, to see if packets containing the string "randomword"can traverse the firewall. Requires four steps: 1 create a class for your test 2 implement the execute method 3 implement the evaluate method 4 register your test with the application (More detailed in ft6 s documentation) Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 19 von 25
20 ft6 Writing your own tests Step 1: Create a class for your test class TestRandomWord(Test): def init (self, id, name, description, test_settings, app): super(testrandomword, self). init (id, name, description, test_settings, app) Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 20 von 25
21 ft6 Writing your own tests Step 2: implement the execute method def execute(self): e = Ether(dst=self.test_settings.router_mac) ip = IPv6(dst=self.test_settings.dst, src=self.test_settings.src) udp= UDP(dport=self.test_settings.open_port, sport=12345) payload = "ipv6-qab"*128 packet = e/ip/udp/(payload + "randomword") sendp(packet) packet = e/ip/udp(payload + "someotherword") sendp(packet) Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 21 von 25
22 ft6 Writing your own tests Step 3: implement the evaluate method def evaluate(self, packets): results = [] found_random = False found_otherword = False # iterate over the packets, filter those that belong to the test for p in packets: tag = str(p.lastlayer()) if not "ipv6-qab" in tag: continue if "randomword" in tag: found_random = True if "someotherword" in tag: found_otherword = True Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 22 von 25
23 ft6 Writing your own tests Step 3: implement the evaluate method # evaluate the flags if found_random: results.append("success", "Your firewall forwarded a packet with a random word!") else: results.append("failure", "Your firewall dropped a packet with a random word!") if found_otherword: results.append("warning", "Your firewall forwarded a packet with some other word. That s very weird!") else: results.append("success", "Your firewall dropped a packet with some other word. Well done firewall!") return results Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 23 von 25
24 ft6 Writing your own tests Step 4: register your test # create test classes, store them in the dictionary # so they can later be called by their id ticmp = TestICMP(1, "ICMPv6 Filtering", "The ICMP Test", self.test_settings, app)... trandomword = TestRandomWord(42, "My Random Word Test", "Tests for Random Words", self.test_settings, app) self.tests = dict([ (ticmp.id, ticmp),..., (trandomword.id, trandomword)]) Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 24 von 25
25 ft6 future work ft6 is a work in progress lots of improvement could be done reducing the number of text fields better results more tests your thoughts: contact@idsv6.de ft6 is available at Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 25 von 25
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