Hey everyone!

Here are our meeting logs:

http://meetbot.debian.net/tor-meeting/2021/tor-meeting.2021-10-14-15.59.html

and our meeting pad:

Anti-censorship work meeting pad --------------------------------

Next meeting: Thursday October 14th 16:00 UTC

Weekly meetings, every Thursday at 16:00 UTC, in #tor-meeting at OFTC (channel is logged while meetings are in progress)

== Goal of this meeting ==

Weekly checkin about the status of anti-censorship work at Tor. Coordinate collaboration between people/teams on anti-censorship at Tor.

== Announcements ==

== Discussion ==

Snowflake usage is approaching meek levels

https://metrics.torproject.org/userstats-bridge-transport.html?start=2021-07...

Comparison of throughput through bridges:

flakey: https://metrics.torproject.org/rs.html#details/5481936581E23D2D178105D44DB69...

meek bridge: https://metrics.torproject.org/rs.html#details/8F4541EEE3F2306B7B9FEF1795EC3...

PT spec v2.2.1 [RFC] -- https://github.com/Pluggable-Transports/Pluggable-Transports-spec/tree/main/...

comments requested

for now, put feedback in github issues

anadahz is working on providing a text format for easier commenting

PTIM 2021 registration closes at October 17th 2021 AoE -- https://www.pluggabletransports.info/ptim2021/

Unifying bridge/broker domain names? All these different names point to the same place

proxy uses snowflake-broker.bamsoftware.com and snowflake.bamsoftware.com

webext uses snowflake-broker.freehaven.net and snowflake.freehaven.net

client uses snowflake-broker.torproject.net

https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... would make all use torproject.net; closed without action, see http://meetbot.debian.net/tor-meeting/2019/tor-meeting.2019-08-15-16.59.log....

https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... changed CNAME for freehaven.net to avoid malware detection problems

https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... if other people start embedding domain names in their configs, it becomes harder for us to change in the future

Note that torproject.net might be blocked in the UK: https://gitlab.torproject.org/legacy/trac/-/issues/31250#note_2330960

Choose a reading to discuss :)

== Actions ==

== Interesting links ==

Using censor middleboxes to amplify DoS attacks:

https://geneva.cs.umd.edu/posts/usenix21-weaponizing-censors/ https://lwn.net/Articles/869842/

== Reading group ==

We will discuss "Characterizing Transnational Internet Performance and the Great Bottleneck of China" on 2021-10-28

https://censorbib.nymity.ch/#Zhu2020a

Questions to ask and goals to have:

What aspects of the paper are questionable?

Are there immediate actions we can take based on this work?

Are there long-term actions we can take based on this work?

Is there future work that we want to call out, in hopes that others will pick it up?

== Updates ==

Name: This week: - What you worked on this week. Next week: - What you are planning to work on next week. Help with:

- Something you need help with.

cecylia (cohosh): last updated 2021-10-14 Last week: - worked on snowflake simulations in shadow (snowflake#40026) - updated docker obfs4 bridge image to 0.7 - https://hub.docker.com/r/thetorproject/obfs4-bridge/tags - helped network health team contact bridge operators running old tor versions (core/tor#40480) - generated reachability plots for our new rotating IP bridges (censorship-analysis#40020) - opened MR to unify broker/bridge domains for snowflake.git (snowflake!59, snowflake-webext!22) This week: - automate blocking detection for rotating IP bridges (censorship-analysis#40020) - finish up snowflake library changes for v2 (snowflake#40063) - more snowflake performance work (snowflake#40026) Needs help with: - review of snowflake!59 and snowflake-webext!22

arlolra: 2021-08-12

Last week:

- Migrate to v3 of the webextension manifest

Next week:

- Maybe get back to snowflake-webext #10

- Write up the pitch for our use case for supporting creating PeerConnections in background service workers https://github.com/w3c/webrtc-extensions/issues/77

Help with:

-

dcf: 2021-10-14

Last week:

- snowflake Azure bookkeeping https://gitlab.torproject.org/tpo/anti-censorship/team/-/wikis/Snowflake-cos...

Next week:

- review broker domain name normalization https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf...

Help with:

agix:2021-07-15

Last week:

-Off due to final exams

Next week:

-Work on bridgebox for rdsys

-More research on httpt #4

Help with:

-

hanneloresx: 2021-3-4

Last week:

- Submitted MR for bridgestrap issue #14

Next week:

- Finish bridgestrap #14

- Find new issue to work on

Help with:

-

maxb: 2021-09-23

Last week:

- Worked on https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... re: utls for broker negotiation

- Had conversation with someone about upstream utls http round tripper https://github.com/refraction-networking/utls/pull/74

- Too busy with work :/

Next week:

- _Really_ want to get a PR for utls round tripper

meskio: 2021-10-14

Last week:

- honour bridge operator distribution request (rdsys!16)

- update circumvention settings distributor for TB needs (rdsys#59)

- extend zoossh to parse bridge descriptors and consensus files

https://github.com/NullHypothesis/zoossh/pull/13/

- digg into bridgedb bridge storage to replace it by rdsys (bridgedb#40031)

- update obfs4 bridge docker documentation

https://gitlab.torproject.org/tpo/web/community/-/merge_requests/99

Next week:

- make bridgedb a rdsys distributor (bridgedb#40031)

- update gettor links (gettor#82)

- figure out what happens with gitlab gettor repo