Difference between revisions of "SoC/2017"

(Project Information)
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The project timeline and development journal is documented in its dedicated [https://dimgrav.blogspot.gr/ blogspot].
 
The project timeline and development journal is documented in its dedicated [https://dimgrav.blogspot.gr/ blogspot].
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'''Repositories'''
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* Stand-alone repository (requires Samba source code for integration): [https://github.com/dimgrav/Samba-GSOC2017 link]
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* Personal samba-team/samba fork: [https://github.com/dimgrav/samba link]
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* Samba GitHub mirror: [https://github.com/samba-team/samba link]
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Revision as of 11:28, 26 August 2017

Improve libcli/dns

Samba comes with its own asynchronous DNS parser framework developed for the internal DNS server. Basic calls have been implemented for a client-side library as well, but a more fleshed out implementation would be needed. The goal of this project is to implement more high-level calls handling DNS requests, such as UDP/TCP switchover and client-side GSS-TSIG cryptography. A test suite excercising all the functions is required and can be used to cross-check and complement the existing DNS server tests already shipped by Samba. This testsuite should use cmocka.

  • Difficulty: Medium
  • Language(s): C
  • Mentors: Kai Blin, David Disseldorp
  • Student: Dimitris Gravanis



Project Information

Client-side DNS call handling with GSS-TSIG


Unix SMB/CIFS implementation

Dimitrios Gravanis (C) 2017

Based on the existing work by Samba Team


About



For the Samba AD DC, libcli/dns is a library that allows the handling of DNS calls (send/receive requests) and generates GSS-TSIG type encryption signature for signed packets, to accomodate encrypted client-server communication.

It consists of its respective function and structure libraries, that provide definitions for client-side functionality.

Test suites are also available, that inspect individual features of cli_dns.c

For more information on the project goals, read the GSoC proposal here.

The project timeline and development journal is documented in its dedicated blogspot.


Repositories

  • Stand-alone repository (requires Samba source code for integration): link
  • Personal samba-team/samba fork: link
  • Samba GitHub mirror: link


DNS Client (with wrapper support)



Handles TCP and UDP requests.

The client may use either TCP or UDP protocols to send a DNS name request to the server, then handle the reception of the appropriate server response.

Features:

  • UDP request send/receive
  • TCP request send/receive
  • GSS-TSIG generation
  • DNS name packet parsing and signing

The library consists of cli_dns.c, that includes functions, and dns.h, libtcp.h, libtsig.h, libudp.h, that provide declarations, definitions and structures.


Wrapping



wrap_cli.c provides multiple wrapping of the above functionality, to hide buffer creation, DNS packet parsing and signature generation. Definitions of the wrapped functions are provided in libwrap.h.


Test suite


cli_tests.c provides a test suite for all client-side functionality, as defined by the functions in libcli/dns/cli_dns.c. The API used for unit testing is Cmocka.