Hi,
Great question. First, it is important to highlight that sometimes censorship is not implemented uniformly across all ISPs in a country. For example, see Tor Metrics in Russia: - https://metrics.torproject.org/userstats-relay-country.html?start=2023-04-23... - https://metrics.torproject.org/userstats-bridge-combined.html?start=2023-04-...
And sometimes you'll find some interesting metrics anomalies, e.g., in China: - Vanilla Tor connections spikes: https://metrics.torproject.org/userstats-relay-country.html?start=2023-04-23... - Bridge users: https://metrics.torproject.org/userstats-bridge-combined.html?start=2023-04-...
Second, in Turkmenistan case, it appears that one ISP (AGTS) had different censorship rules compared to their main ISP, Turkmentelecom. As a result, AGTS clients were able to use tools like tor-relay-scanner[1] to find unblocked Tor relays and use them as Tor "vanilla OR bridges" to bypass the block.
But, this workaround was blocked in AGTS/Turkmenistan last week and it is no longer effective.
Gus
[1] https://github.com/ValdikSS/tor-relay-scanner
On Sat, Jul 22, 2023 at 03:47:18PM +0200, telekobold wrote:
Hi,
just a question out of interest: If there is such a massive blocking of Tor in Turkmenistan, how can it be that there seem to have been measured between 1500 and 10000 direct connections with Tor from Turkmenistan this year [1]? The curve has had a very sharp drop to almost zero recently, but I would have expected it to be close to zero all along given the reports.
The number of clients directly connected to Tor seems to be even comparable to the number of clients connected via bridges for the last months [2].
Kind regards telekobold
[1] https://metrics.torproject.org/userstats-relay-country.html?start=2023-01-01... [2] https://metrics.torproject.org/userstats-bridge-country.html?start=2023-01-0...
On 21.07.23 18:07, gus wrote:
Hi,
New update: In the last few weeks, internal political conflicts and other events[1] in Turkmenistan have led to another wave of censorship on Tor and anti-censorship tools. Tor bridges have been one of the few free alternatives for people in Turkmenistan to connect with the world and access the open Internet.
If you have access to an IP range that has never seen the light of day, a stable residential connection, or access to your university network, you can help thousands of people connect to the internet in Turkmenistan.
Tor bridges running on residential connections, on dynamic IPv4 address, or on unblocked IP ranges are effective, but are regularly discovered and blocked by censors, thus making us to call for new bridges. These bridges must run on specific obfs4 ports: 80, 8080, or 443. See below the example of torrc for your bridge. If it's your first time running a bridge, please follow our official guide: https://community.torproject.org/relay/setup/bridge/.
Finding an IP range that is unblocked-in the country is not easy. However, bridges in universities and IP ranges in US have been of great help to people in Turkmenistan. Please note that it's not possible to run IPv6-only bridges and Turkmenistan has a very small adoption of IPv6.
If you run a bridge to help people in Turkmenistan, send your bridge line to frontdesk@torproject.org. We will share your bridge with people that really need it!
A bridge line is composed of:
IP:OBFS4_PORT FINGERPRINT cert=obfs4-certificate iat-mode=0
If you need help to build your bridge line, please check the official guide: https://community.torproject.org/relay/setup/bridge/post-install/
## Other Pluggable Transports
- Snowflake has been blocked in the country since 2021:
- STUN servers are running on blocked IP ranges
- When we found an available STUN server, it didn't find a proxy to match (probably because of the TM's IP range rules). For more
information, see this ticket[2].
- Meek[3] (domain fronting) is one of the few techniques that consistently works, but with reduced speed. While there is a dedicated
bridge for TM, its cost is high.
- Conjure[4] was successfully tested, but more development hours are still needed for its maintenance and stabilization. Currently it is
only available on Tor Browser Alpha and some other Tor powered apps.
- WebTunnel[5] could potentially work, but like obfs4 bridges, it depends on whether the website is hosted on an IP range that is not
blocked in Turkmenistan.
## Research and other resources
If you would like to learn more about censorship in Turkmenistan, ntc.party is a great resource (posts in Russian): https://ntc.party/c/internet-censorship-all-around-the-world/turkmenistan/17
And this paper (2023) about measuring Internet censorship in TM:
"Measuring and Evading Turkmenistan's Internet Censorship: A Case Study in Large-Scale Measurements of a Low-Penetration Country" (Sadia Nourin, Van Tran, Xi Jiang, Kevin Bock, Nick Feamster, Nguyen Phong Hoang, Dave Levin) 2023-04-17 https://arxiv.org/abs/2304.04835 https://tmc.np-tokumei.net/
## Tor metrics
You can follow a rough estimate of Tor usage in Turkmenistan here:
- https://metrics.torproject.org/userstats-bridge-combined.html?start=2023-04-...
- https://metrics.torproject.org/userstats-relay-country.html?start=2023-04-21...
## torrc example
BridgeRelay 1 ORPort 127.0.0.1:auto AssumeReachable 1 ServerTransportPlugin obfs4 exec /usr/bin/obfs4proxy ServerTransportListenAddr obfs4 0.0.0.0:8080 ExtORPort auto Nickname helptm ContactInfo <please-add-your-email-here> Log notice file /var/log/tor/notices.log # If you set BridgeDistribution none, please remember to email # your bridge line to us: frontdesk@torproject.org BridgeDistribution none
Thank you, Gus
Notes
[1] https://www.rferl.org/a/turkmenistan-top-officials-fired/32507072.html https://www.reuters.com/world/asia-pacific/turkmenistan-opens-futuristic-cit... [2] https://gitlab.torproject.org/tpo/anti-censorship/censorship-analysis/-/issu... [3] https://metrics.torproject.org/rs.html#details/A77AB4544CEB3AB8155FC5D18E696... [4] https://forum.torproject.org/t/call-for-testers-help-the-tor-project-to-test... [5] https://forum.torproject.org/t/tor-relays-announcement-webtunnel-a-new-plugg...
On Tue, Apr 04, 2023 at 12:46:47AM -0300, gus wrote:
Hello,
Another update:
As it's very hard to get a vantage point in the country[1], we've asked feedback from users to understand what works there. But, if by any chance you have access to a machine hosted there, do let me know! You can contact me in private. :)
Based on user feedback, we learned that obfs4 bridges running on residential connections + port 80, 443 or 8080 works in Turkmenistan. Last week I asked some operators to change their bridge obfs4 port and it worked!
Unfortunately, users reported that censors blocked some bridges. You can even see that on Tor Metrics graph. For example:
- https://metrics.torproject.org/rs.html#details/D1302AC19A71BED956C568AC79DF0...
- https://metrics.torproject.org/rs.html#details/A811AAB7771434CE0DD4D3942173E...
If you're operating these bridges and can easily rotate the IP address, please do!
Finally, if you want to learn more about censorship in Turkmenistan, you can check this great presentation[2] from last year.
Thanks for running bridges! Gus
[1] https://ntc.party/t/vps/2804/9 [2] https://drive.google.com/file/d/1odIO1Bi9laU-B-JZMoZFWGEwkTl95oq9/view
On Thu, Mar 23, 2023 at 01:00:17PM -0300, gus wrote:
Hello, just a quick update:
Some friends from Turkmenistan told me that they don't think this new round of online censorship is related to the upcoming elections, because it's just a "formal" event. In general, they said, shutdowns and internet disruptions are motivated by other events like:
- when Russian Duma speaker arrived in TM
- the wedding day of the president's grandson
Anyway, today we tested some of bridges that you shared with us and I replied back saying which ones worked and which ones didn't.
Thank you for running a bridge!, Gus
On Wed, Mar 22, 2023 at 04:25:05PM -0300, gus wrote:
Dear Relay operators community,
The parliamentary elections in Turkmenistan are coming up very soon on March 26th[1], and the Turkmen government has tightened internet censorship and restrictions even more. In the last few months, the Anti-censorship community has learned that different pluggable transports, like Snowflake, and entire IP ranges, have been blocked in the country. Therefore, running a bridge on popular hosting providers like Hetzner, Digital Ocean, Linode, and AWS won't help as these providers' IP ranges are completely blocked in Turkmenistan.
Recently, we learned from the Anti-censorship community[2] and via Tor user support channels that Tor bridges running on residential connections were working fine. Although they were blocked after some days or a week, these bridges received a lot of users and were very important to keep Turkmens connected.
How to help Turkmens to access the Internet
You can help Turkmens to access the free and open internet by running an obfs4 Tor bridge! But here's the trick: you need to run it on a residential connection -- you won't need a static IPv4 --, and it would ideally be run on more robust hardware than just a Raspberry Pi (although that can help, we have found they can get overloaded).
You can set up an obfs4 bridge by following our official guide: https://community.torproject.org/relay/setup/bridge/
After you setup a new bridge, you can share your bridge line with the Tor support team at frontdesk@torproject.org, and we will share it with users.
A complete bridge line is composed of:
IP:OBFS4_PORT FINGERPRINT cert=obfs4-certificate iat-mode=0Check this documentation to learn how to share your bridge line: https://community.torproject.org/relay/setup/bridge/post-install/
Just sharing your bridge fingerprint is not the best, but it's fine.
You can read more about censorship against Tor in Turkmenistan here:
- https://gitlab.torproject.org/tpo/anti-censorship/censorship-analysis/-/issu...
- Snowflake blocked: https://gitlab.torproject.org/tpo/anti-censorship/censorship-analysis/-/issu...
Thank you for your support in helping to keep the internet free and open for everyone.
Gus
[1] https://en.wikipedia.org/wiki/2023_Turkmen_parliamentary_election [2] https://ntc.party/c/internet-censorship-all-around-the-world/turkmenistan/17 https://github.com/net4people/bbs/issues/80
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