DNS Privacy Project

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getdns is currently the most feature rich client for DNS-over-TCP and DNS-over-TLS features

 

getdns 0.9

  • Website: https://getdnsapi.net/
    • getdns supports multiple features related to DNS privacy including persistent connections, strict and opportunistic privacy profiles and TLS authentication by hostname of SPKI pinset
  • API spec: https://getdnsapi.net/spec.html
  • Source:  https://github.com/getdnsapi/getdns
  • Query: Use API directly, or use with the wrapper script getdns_query (run 'make getdns_query' then getdns_query is found in the test directory):
    • getdns_query @<serverIP> -s -a -A -l T  (Pipelined TCP queries)
    • getdns_query @<serverIP> -s -a -A -l L   (Pipelined TLS queries)
    • getdns_query @<serverIP> -s -a -A -l LT  (Pipelined TLS queries with fallback to TCP)
    • getdns_query @<serverIP>~<hostname> -s -a -A -l L -m (Pipelined TLS queries in strict mode using server hostname for authentication)

LDNS (drill) 1.6.17

  • Source: ldns 1.6.17 source code available from this link to NLNet Labs: ldns-1.6.7
  • Patch: Grab and apply the patch to ldns-1.6.17 from out git repository. Also see the notes here.
  • Query: To query this with drill use: (the IP address is used here simply to stop the server name resolution falling back to TCP because your local resolver doesn't support DNS-over-TLS).

    • drill -t             @<serverIP>  <query name>    (to see TCP query)

    • drill -l -p1021 @<serverIP>  <query name>    (to see TLS query)

    • drill -C           @<serverIP>  <query name   (to see STARTTLS query)

    • drill -C -D      @<serverIP>  <query name>    (to do a DNSSEC lookup using STARTTLS)

Digit 1.4

  • Source: Grab the digit client DNS-over-TLS tool from the ISI website:
    http://www.isi.edu/ant/software/tdns/index.html
  • Query: Build digit with openssl:

    • create a file called queries containing a query name

    •  ./digit -f queries -r <serverIP> -V -t tcp     (to see TCP query)

    •  ./digit -f queries -r <serverIP> -V -t ssl      (to see DNS-over-TLS query) 


How to Decode TLS packets in Wireshark

If you want to decode the DNS packets in Wireshark (use 1.12.1 or later) to get support TLSv1.2

  • Obtain the server key file

  • Configure the key in wireshark in Edit->Preferences

    • open the protocol list in the right hand menu and select SSL from the list
    • Click on the RSA keys list 'Edit' box and then click on 'New' in the dialog that appears
      • Enter remote servers IP address and the port for TLS (1021), and 'http' or 'spdy' for the protocal (DNS is not yet available here).
      • Use the Key File selector to choose the key file you downloaded
    • Save this by hitting OK, OK and Apply.
    • Back in the main window use the Analyze->Decode as... option to choose to decode as SSL
    • Click on one of the packets labelled 'Application data' and you should see an additional tab appear in the Packet bytes view window of wireshark labelled "Decrypted SSL data".

 

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