[tor-project] Anti-censorship team meeting notes, 2025-03-27

Hey everyone!

Here are our meeting logs:

And our meeting pad:

Anti-censorship

···

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Next meeting: Thursday, April 3 16:00 UTC
Facilitator: onyinyang
^^^(See Facilitator Queue at tail)

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

This week's Facilitator: meskio

== 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 the Tor Project and Tor community.

== Links to Useful documents ==
  * Our anti-censorship roadmap:
    * Roadmap:Development · Boards · Anti-censorship · GitLab
  * The anti-censorship team's wiki page:
    * Home · Wiki · The Tor Project / Anti-censorship / Team · GitLab
  * Past meeting notes can be found at:
    * The tor-project Archives
  * Tickets that need reviews: from projects, we are working on:
    * All needs review tickets:
      * Merge requests · Anti-censorship · GitLab
    * Project 158 <-- meskio working on it
      * Issues · Anti-censorship · GitLab

== Announcements ==

  *

== Discussion ==

  * Give @renovate-bot guest access to anti-censorship group for it to use dependency proxy src shell
    * go-1.22 (#912381) · Jobs · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab
    * shelikhoo will give it rights on monday

== Actions ==

== Interesting links ==

  *

== Reading group ==

  * We will discuss "Differential Degradation Vulnerabilities in Censorship Circumvention Systems" on April 3
    * [2409.06247] Differential Degradation Vulnerabilities in Censorship Circumvention Systems
    * 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): 2025-03-27
  Last week:
      - deployed a new snowflake broker with logging and client timeout fixes
      - followed up on cleaning up broker log messages (snowflake#40454)
          - snowflake!545
      - wrote an update on snowflake sqs rendezvous channel
      - looked more at rendezvous errors (snowflake#40447)
      - tor safety board review
  This week:
      - support conjure work
      - follow up on snowflake rendezvous failures
          - reduce/remove use of mutexes for broker metrics (snowflake#40458)
      - take a look at potential snowflake orbot bug
          - [BUG] 20% CPU overhead in kindness mode · Issue #1183 · guardianproject/orbot-android · GitHub
      - maybe do some lox work
  
dcf: 2025-03-20
  Last week:
    - archived a Kazakhstan URL blocklist [Kazakhstan] Censorship monitoring 2025 (#40059) · Issues · The Tor Project / Anti-censorship / censorship-analysis · GitLab
  Next week:
    - archive snowflake-webextension-0.9.3
    - open issue to have snowflake-client log whenever KCPInErrors is nonzero Deploy snowflake-server for QueuePacketConn buffer reuse fix (#40260) (#40262) · Issues · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab
      - parent: Improve bug discovery process (#40267) · Issues · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab
Help with:

meskio: 2024-03-27
    Last week:
        - crate a docker-compose file for rdsys (rdsys#219)
        - try and fail to update obfs4-proxy docker image, arm* gives me timeouts in go get (docker-obfs4-bridge#21)
        - deploy rdsys backend fixes to don't distribute dysfunctional bridges (team#156)
    Next week:
        - steps towards a rdsys in containers (rdsys#219)

Shelikhoo: 2024-03-27
    Last Week:
         - [Testing] Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (cont.)( Draft: Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (!315) · Merge requests · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab ) testing environment setup/research
        - Snowflake Staging Server (cont.) Discussion(Setup Snowflake Staging Server (#42080) · Issues · The Tor Project / TPA / TPA team · GitLab)
        - Snowfalke Staging Server Experiment
        - Merge request reviews
    Next Week/TODO:
        - Merge request reviews
        - [Testing] Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (cont.)( Draft: Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (!315) · Merge requests · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab ) improvements
        - Snowfalke Staging Server Experiment

onyinyang: 2025-03-13
  Last week(s):
    - continued work on ampcache registration method for conjure
      - WIP MR: Adding AMP Cache registrar to conjure by onyiny-ang · Pull Request #1 · cohosh/conjure · GitHub
        - Add AMP Cache registration Method to Conjure (!34) · Merge requests · The Tor Project / Anti-censorship / Pluggable Transports / conjure · GitLab
     - lox issuer efficiency merged!
  Next week:
     - HACS/Zkproofs/OSCW/RWC
    - finish up ampcache registration method
    - Begin work on decoy registration option
    - review Tor browser Lox integration
      - Bug 43096: Move to Rust for the Lox integration (!1300) · Merge requests · The Tor Project / Applications / Tor Browser · GitLab
    - add TTL cache to lox MR for duplicate responses:
    Enable repeat responses to successful Lox requests (!305) · Merge requests · The Tor Project / Anti-censorship / lox · GitLab
    As time allows:
    - Work on outstanding milestone issues:
      - key rotation automation
    
    Later:
    pending decision on abandoning lox wasm in favour of some kind of FFI? Consider dropping Lox's WASM (#43096) · Issues · The Tor Project / Applications / Tor Browser · GitLab):
      - add pref to handle timing for pubkey checks in Tor browser
      - add trusted invitation logic to tor browser integration:
      Lox module doesn't include trusted invitation redemption (#42974) · Issues · The Tor Project / Applications / Tor Browser · GitLab
    - improve metrics collection/think about how to show Lox is working/valuable
    - sketch out Lox blog post/usage notes for forum
    
  (long term things were discussed at the meeting!):
    - brainstorming grouping strategies for Lox buckets (of bridges) and gathering context on how types of bridges are distributed/use in practice
      Question: What makes a bridge usable for a given user, and how can we encode that to best ensure we're getting the most appropriate resources to people?
        1. Are there some obvious grouping strategies that we can already consider?
          e.g., by PT, by bandwidth (lower bandwidth bridges sacrificed to open-invitation buckets?), by locale (to be matched with a requesting user's geoip or something?)
        2. Does it make sense to group 3 bridges/bucket, so trusted users have access to 3 bridges (and untrusted users have access to 1)? More? Less?
    
theodorsm: 2025-03-06
    Last weeks:
      - Implementing key_share extension support in covert-dtls
      - Implementing mimicking DTLS 1.3 extensions
      - Debugging Tor Build with covert-dtls: Add covert-dtls to proxy and client (!448) · Merge requests · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab
    Next weeks:
      - Update MR with new covert-dtls version.
      - Write instructions on how to configure covert-dtls with snowflake client
      - Fix merge conflicts in MR (Add covert-dtls to proxy and client (!448) · Merge requests · The Tor Project / Anti-censorship / Pluggable Transports / Snowflake · GitLab).
      - Condensing thesis into paper (on hold)
    Help with:
      - Test stability of covert-dtls in snowflake
      
Facilitator Queue:
     onyinyang shelikhoo meskio
1. First available staff in the Facilitator Queue will be the facilitator for the meeting
2. After facilitating the meeting, the facilitator will be moved to the tail of the queue

--
meskio | https://meskio.net/
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My contact info: https://meskio.net/crypto.txt
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Nos vamos a Croatan.

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