[tor-reports] Core Tor report for sponsorU June/2016

[Isabela]

Hello there!

this is the Core Tor work done in June for SponsorU.

Cheers,
Isabela

-- 
PM at TorProject.org
gpg fingerprint = 8F2A F9B6 D4A1 4D03 FDF1  B298 3224 4994 1506 4C7B
@isa

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Core Tor June 2016 report

During the month of June we worked on the following:

To better defend against DoS attacks, we worked on [1], which makes every connection request use random-exponential-backoff on failure to resolve repeated-connection overloading issues in general. In  particular, it reduces the risk that old versions will DoS the authorities as clients are switched off.

We also have some new code ready for review with smarter algorithms to handle socket exhaustion [2], another way to protect ouselves from possible DoS
attacks.

We did other smaller modifications like [3], which helps debug issues related to malformed votes, and [4], which helps deal with a dirauth disk-space related
denial-of-service vector. 

For our new Guard Algorithm work we spend a great amount of time cleaning up and fixing our design [5]. We did some POC and have pieces of the code working [6] which allowed us to learn what works and what doesn't work with our design implementation[7].  In July, we hope to finalize the design.

We are doing this to prepare the new Guard Algorithm to be released with Core Tor 0.2.9, which is our next release scheduled for freeze on September.  

[1] https://trac.torproject.org/projects/tor/ticket/15942   
[2] https://trac.torproject.org/projects/tor/ticket/18640
[3] https://trac.torproject.org/projects/tor/ticket/18322
[4] https://trac.torproject.org/projects/tor/ticket/18320
[5] https://trac.torproject.org/projects/tor/ticket/12595   
[6] https://trac.torproject.org/projects/tor/ticket/17262   
[7] https://trac.torproject.org/projects/tor/ticket/19468
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