Fuzzer for DTLS. Created at the University of Bremen in the block course "Server Hardening"
Usage
In fuzzer.rb are some examples how to use the "do_steps" method. With this method you can execute the handshake of dtls to the step of your choise. The method will return all pakets which was exchanged between fuzzer and server and also the next paket(s) needed to send to continue handshake. So you are able to change all the parameters of the packet, to start special tests. If already available, the method will return the keys to. At the moment there is only one ciphersuite supported: TLS_PSK_WITH_AES_128_CCM_8
Available steps
do_steps returns an array [tosend, messages, [client_key, server_key, client_iv, server_iv]]. content depends on the step.
Step | Keys | already send | tosend
------------------------------------------------------------------------------------------
0 | - | - | ClientHello without Cookie
1 | - | ClientHello without Cookie | ClientHello with Cookie
2 | avail. | ClientHello with Cookie | ClientKeyExchange, ChangeCipherSpec, Finished
3 | avail. | ClientKeyExchange | ChangeCipherSpec, Finished
4 | avail. | ChangeCipherSpec | Finished
5 | avail. | Finished | ApplicationData
6 | avail. | ApplicationData | CloseNotify
7 | avail. | CloseNotify | -
Fuzzer Server
------ ------
ClientHello (seq=0) ----0--->
<-------- (seq=0) HelloVerifyRequest
ClientHello (seq=1) ----1--->
(mit cookie)
<-------- (seq=1) ServerHello
<-------- (seq=2) ServerKeyExchange
<-------- (seq=3) ServerHelloDone
ClientKeyExchange (seq=2) ----2--->
ChangeCipherSpec ----3--->
Finished (seq=3) ----4--->
<-------- ChangeCipherSpec
<-------- (seq=4) Finished
Application Data ----5--->
<-------- Application Data
CloseNotify ----6--->
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