Hey everyone!

Here are our meeting logs:

http://meetbot.debian.net/tor-meeting/2022/tor-meeting.2022-09-29-15.58.html

And our meeting pad:

Anti-censorship work meeting pad

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Next meeting: Thursday Oct 6 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 check-in about the status of anti-censorship work at Tor. Coordinate collaboration between people/teams on anti-censorship at Tor.

== Links to Useful documents ==

* Our anti-censorship roadmap: * Roadmap: https://gitlab.torproject.org/groups/tpo/anti-censorship/-/boards * The anti-censorship team's wiki page: * https://gitlab.torproject.org/tpo/anti-censorship/team/-/wikis/home * Past meeting notes can be found at: * https://lists.torproject.org/pipermail/tor-project/ * Tickets that need reviews: from sponsors we are working on: * All needs review tickets: * https://gitlab.torproject.org/groups/tpo/anti-censorship/-/merge_requests?sc... * Sponsor 28 * must-do tickets: https://gitlab.torproject.org/groups/tpo/-/milestones/10 * possible tickets: https://gitlab.torproject.org/groups/tpo/-/issues?scope=all&utf8=%E2%9C%... * Sponsor 96 * https://gitlab.torproject.org/groups/tpo/-/milestones/24

== Announcements ==

*

== Discussion ==

* snowflake-01 bridge resources * https://lists.torproject.org/pipermail/anti-censorship-team/2022-September/0... and following * summary of optimizations so far: https://forum.torproject.net/t/iran-circumventing-censorship-with-tor/4590/2... * cumulative merge request https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... * the bridge is doing about 2.5 Gbps for most of the day, but it clearly has hit some kind of resource limitation, even with apparent CPU and RAM headroom * current thinking is that it has to do with conntrack in the kernel and perhaps network interface driver tuning * https://lists.torproject.org/pipermail/anti-censorship-team/2022-September/0... * will require some preparation and a reboot, planned to happen later today * move some operation to second NIC https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... * disable conntrack https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... * reboot https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... * Snowflake Enable Distributed Snowflake Support at broker src shell * https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/95 * we are blocked to enable it as it will reject all proxies that are not updated, mostly standalone proxies * 28% of the unrestricted proxies haven't updated * current Tor Browser's snowflake-client doesn't have relay URL support, we need to change that: https://gitlab.torproject.org/tpo/applications/tor-browser-build/-/issues/40... * we will try to reject old proxy next Monday, and a revert guide will be prepared by shelikhoo to help every team member revert this chance as if needed * snowflake proxy resources * https://lists.torproject.org/pipermail/anti-censorship-team/2022-September/0... and following * there is a squeeze on proxies with unrestricted NAT * merge request to have existing proxies provide more service: https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... * had probetest restart itself more frequently, 4h instead of 7d https://lists.torproject.org/pipermail/anti-censorship-team/2022-September/0... * Moat went down, has now been fixed * Too many file descriptors issue, probably from increased load * meskio will regenerate the captchas * Iran obfs4 block by protocol src shell * https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/96#note_2838... * a connection to fresh new private bridge was blocked when crossing the Iranian border * Iran might be blocking random looking protocols, or just anything they can't recognize

== Actions ==

== Interesting links ==

== Reading group ==

* We will discuss "" on * * 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 2022-09-29 Last week: - monitored snowflake proxy pool - implemented more frequent polling and higher max clients for unrestricted proxies - https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... - set timeout for probetest to 4h - https://lists.torproject.org/pipermail/anti-censorship-team/2022-September/0... - answered forum posts and did some ticket maintenance - handled moat outage - https://gitlab.torproject.org/tpo/anti-censorship/rdsys/-/issues/121 This week: - continue monitoring snowflake proxy pool and implement some improvements - resume Conjure work - wrap up manifest v3 candidate Needs help with:

dcf: 2022-09-29 Last week: - did a bunch of profiling and performance optimizations on the snowflake-01 bridge - profiling: https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... ff. - increase instances from 4 to 8 https://bugs.torproject.org/tpo/anti-censorship/pluggable-transports/snowfla... - increase instances from 8 to 12 https://bugs.torproject.org/tpo/anti-censorship/pluggable-transports/snowfla... - reduce websocketconn allocation, reduce keepalive timeout https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... - reduce copy buffer allocations https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... - reduce the size of send queues https://bugs.torproject.org/tpo/anti-censorship/pluggable-transports/snowfla... - reduce allocation in queuing incoming packets (didn't have an effect) https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... - made a graph of Tor usage in Iran in the past week - https://forum.torproject.net/t/graphs-of-user-counts-from-iran-since-the-ons... Next week: - assist with disabling of conntrack and reboot of snowflake-01 bridge https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowf... - disable non-WireGuard SSH access to snowflake-02 - migrate goptlib to gitlab https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/86#note_2823... - try Conjure PT development version https://forum.torproject.net/t/tor-dev-introducing-a-conjure-pt-for-tor/4429 Help with:

meskio: 2022-09-29 Last week: - try and fail to do the final deploy of rdsys-gettor - catch up after two weeks AFK - set up a Bridge for Iran Next week: - deploy rdsys-gettor - fix language issues in BridgeDB (bridgedb#40056)

Shelikhoo: 2022-09-29 Last Week: - [Merge Request Awaiting] Add SOCKS5 forward proxy support to snowflake (snowflake!64) - [Discussion & Deployment] Rollout of Distributed Snowflake Support - [Coding & Deployment] Proposal: Centralized Probe Result Collector (anti-censorship/team#54) - [Research] HTTPT Planning https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/httpt... - [Research] Generate Charts for presention: https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/92#note_2836... - [Research] Iran 2 hop Bridge investigation (https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/96#note_2838..., https://github.com/net4people/bbs/issues/127) - [Research] Investigate Distributed Snowflake Rollout Issue (https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/95) Next Week: - [Research] WebTunnel Planning (Continue) - Generate Charts for presention: https://gitlab.torproject.org/tpo/anti-censorship/team/-/issues/92#note_2836... (Continue) - [Research] Add upload connection info to rdsys in WebTunnel - [Research] Fix vantage point summary upload in China

Itchy Onion: 2022-09-29 Last week: - update snowflake plugin API to RACE 2.3.0 - continue debugging the message dropping issue This week: - continue debugging the message dropping issue