Tor's anti-censorship team writes monthly reports to keep the world updated on its progress. This blog post summarizes the anti-censorship work we got done in June 2020. You can find a Chinese translation of this blog post below. Let us know if you have any questions or feedback!

Snowflake

• Snowflake is now available on Android for alpha versions of Tor Browser:
  https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/30318
• Snowflake proxy app on Android is now able to relay data back and forth.
  • Updated wiki with information on the project:
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/wikis/home
  • Started working on a UI that lets users add custom STUN, broker, relay URLs:
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/5
  • Implemented relaying data back and forth between client and Tor relay:
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/3
  • Establishing a connection with WebSocket.
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/2
  • Handling connection termination or failures from WebRTC.
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34278
  • Establishing a connection with the client using WebRTC.
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34275
  • Created a service to do the work in the background and implemented a wakelock.
    https://trac.torproject.org/projects/tor/ticket/34268
  • Chose libraries for the project: Google's WebRTC library for WebRTC, Retrofit for HTTP calls, OkHttp for WebSocket, RxJava for reactive programming.
• Implemented NAT discovery for Snowflake clients.
  https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34129
• Investigated and abandoned attempts to do NAT discovery for browser-based proxies.
  https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-webext/-/issues/13

BridgeDB

• Added a favicon to bridges.torproject.org.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/19774
• Made progress towards making BridgeDB's email autoresponder more robust to  quoted emails.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/33835
• Made lots of progress towards having BridgeDB report internal metrics.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/31422
• Added a feature that allows us to blacklist bridges that run a given set of Tor versions (e.g., if they suffer from problematic bugs).
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/29184
• Cleaned up and rebased a patch that updates BridgeDB's dependencies.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/33647
• Made progress towards getting BridgeDB to parse and take into account bridge blocking information.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/34260

GetTor

• Investigated a path towards adding GetTor to BridgeDB.
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/3780
• Made some progress towards fixing GetTor's Twitter responder.
  https://gitlab.torproject.org/tpo/anti-censorship/gettor-project/trac/-/issues/27330
• Fixed a typo in the GetTor Gitlab provider links.
• Updated GetTor for Tor Browser 9.5 release.

Outreach

• Philipp gave a talk about our anti-censorship work as part of OONI's Internet  Measurement Village 2020.
  https://www.youtube.com/watch?v=g6xEfNHkFKY
• Published May 2020 team report as blog post.
  https://ocewjwkdco.tudasnich.de/anti-censorship-may-2020
• Had a meeting and discussion with V2Ray developers.
  https://github.com/net4people/bbs/issues/36

UX

• Made progress towards extending anti-censorship personas.
  https://gitlab.torproject.org/tpo/ux/trac/-/issues/32811
• Moved forward with censorship scenarios that we will address as part of our Sponsor 30 grant.
  https://gitlab.torproject.org/tpo/anti-censorship/trac/-/issues/40003
• Created draft for "get bridges" user research.
  https://gitlab.torproject.org/tpo/ux/research/-/issues/4

Miscellaneous

• Improved emma's Makefile.
  https://gitlab.torproject.org/tpo/anti-censorship/emma
• The Tor Project transitioned from Trac (our previous bug tracker) to Gitlab.
• Moved our obfs4 bridge Docker image to new organization account.
  https://hub.docker.com/orgs/thetorproject

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Tor规避审查团队2020年六月份月度报告

Tor项目的规避审查团队发布了今年六月份的月度报告。以下为团队上个月完成的工作。

Snowflake

• Snowflake现在可以在安卓系统Tor浏览器的alpha版本上使用。
  https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/30318
• 安卓系统上的Snowflake代理APP现在能够来回传递数据。
  • 该项目的最新wiki
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/wikis/home。
  • 开始制作用户界面，让用户添加自定义STUN、broker、中继网址。
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/5
  • 实现了客户端和Tor中继之间的数据来回中继。
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/3
  • 成功与WebSocket建立连接。
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-mobile/-/issues/2
  • 处理来自WebRTC的连接终止或失败。
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34278
  • 使用WebRTC与客户端建立连接。
    https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34275
  • 创建了一个在后台工作的服务，并实现了安卓wakelock。
    https://trac.torproject.org/projects/tor/ticket/34268
  • 为项目选择库：Google的WebRTC库用于WebRTC，Retrofit用于HTTP调用，OkHttp用于WebSocket，RxJava用于反应式编程。
• 为Snowflake客户实施NAT发现。
  https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/34129
• 探讨但放弃了对基于浏览器的代理进行NAT发现的尝试。
  https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake-webext/-/issues/13

BridgeDB

• 为bridges.torproject.org添加了一个网站图标。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/19774
• 加强BridgeDB的电子邮件自动回复功能，正确处理引述的电子邮件。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/33835
• 在BridgeDB报告内部指标方面取得了较大进展。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/31422
• 增加了将运行某Tor版本的网桥列入黑名单的功能 (用于如果某版本有严重的bug)。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/29184
• 清理并rebase了一个更新BridgeDB依赖关系的patch。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/33647
• 提高BridgeDB对网桥屏蔽知识的解析和利用。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/34260

GetTor

• 探讨了将GetTor附加入BridgeDB的途径。
  https://gitlab.torproject.org/tpo/anti-censorship/bridgedb/-/issues/3780
• 在修复GetTor的Twitter自动回应功能上取得了一些进展。
  https://gitlab.torproject.org/tpo/anti-censorship/gettor-project/trac/-/issues/27330
• 修正了 GetTor的Gitlab 提供者链接中的一个错别字。
• 为Tor浏览器9.5版更新了 GetTor 版本。

社区交流

• Philipp在OONI互联网测量会议上介绍了我们团队的规避审查工作。研讨录像分享给大家：
  https://www.youtube.com/watch?v=g6xEfNHkFKY
• 将团队的2020年五月月度报告发表在Tor博客。
  https://ocewjwkdco.tudasnich.de/anti-censorship-may-2020
• 与V2Ray开发者们举行了一次在线讨论。
  https://github.com/net4people/bbs/issues/36。

用户体验

• 在研究被审查角色方面取得了进展。
  https://gitlab.torproject.org/tpo/ux/trac/-/issues/32811
• 进一步研究我们在 Sponsor 30 项目针对的若干被审查情景。
  https://gitlab.torproject.org/tpo/anti-censorship/trac/-/issues/40003
• 起草 "获得网桥" 用户体验试点研究。
  https://gitlab.torproject.org/tpo/ux/research/-/issues/4。

杂项

• 改进了emma的Makefile。
  https://gitlab.torproject.org/tpo/anti-censorship/emma
• Tor 项目从 Trac（我们之前的 bug 跟踪系统）过渡到 Gitlab。
• 将 obfs4 bridge Docker 镜像移到了我们新的团体账户。
  https://hub.docker.com/orgs/thetorproject