tor-relays

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4810 discussions

Re: [tor-relays] Comcast blocks ALL traffic with tor relays - probably firewall configuration; further tests
by xmrk2 13 Jun '23

13 Jun '23

Starting from the most interesting info - another Comcast customer contacted me, lets call him CCB, and the first Comcast customer I mentioned previously will be CCA. CCB claims he had to disable some settings - probably "Advanced Security" - in his Comcast router, because before doing so, nobody was able to connect to his lightning node via IPv4 (clearnet, not tor). He claims to have done this back in July or August. We tested just today, and both sides were able to successfully initiate TCP connection, no blocking here. Importantly, at the same time I was not able to connect to CCA - timeout. Chronology of tests, all times are in CEST. around 18:00 yesterday - I started tor relay (non-exit, ExitPolicy reject *:*) 22:09 - it appeared as online on https://metrics.torproject.org/ . Started testing connection to CCA, using "socat -dd - TCP4:<CCA_ADDR>:<CCA_lightning_port>" every 5 minutes. Connected successfully. 07:07 - last successful connection to CCA 07:12 - first unsuccessful connection to CCA - timeout; all subsequent tests with CCA end with timeout 08:10 - stopped tor relay 13:09 - 13:14 - tests with CCB - both sides can connect 17:54 - still cannot connect to CCA 18:19 - connected to CCA from my mobile phone connection (so from another IP, which is not blacklisted, so we see CCA is not offline) 18:55 - still cannot connect to CCA So port forwarding must be correct on CCA, or I would not be able to connect. Now I think the blocking is real, probably on by default, but Comcast customers can opt-out. Doubts / weaknesses of tests and theory: - only tested with 2 Comcast users - not sure about CCA's firewall settings - I just assume he has "Advanced Security" active - my tests only cover connections from me to Comcast users. Not sure if this "Advanced Security" also blocks connections from Comcast users. On one hand, my lightning channel with CCA was inactive for a month or more, and CCA contacted me because of it. Lightning nodes want and try to connect to all peers they have channel with, automatically - so his node presumably tried to connect to mine. And lightning nodes publish their IP addresses, there are sites which show current IP addresses of lightning nodes, like https://1ml.com/node/030c3f19d742ca294a55c00376b3b355c3c90d61c6b6b39554dbc7… (the link already points to a concrete node). My node should announce its IP addresses. So even if connection from me is blocked, he should initiate connection. Inactive channel means he was not successful, difficult to explain without blocking. OTOH, he claims he can connect to tor, so must be able to connect to at least some tor relay, not necessarily mine. Any volunteer Comcast customers for further testing? Preferably without lightning nodes, because I'd like to test with this "Adv. security" active, and it may interfere with lightning node (or any other use-case which needs high uptime). If my theory is correct, Comcast is slightly less evil than my very first post would suggest. Still evil, because this blocking has little to do with security - maybe blocking exit relays makes some sense, they can be misused to attacks, DDoS etc. But according to Comcast, merely running tor relay makes you a threat. And this so-called security is probably on by default (according to CCB) and "There are definitely popups all over the place telling me to turn it on". So it is probably not apparent that this setting blocks (some? most?) tor relays completely.

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«Possible compression bomb» from Authority?
by Tschador 07 Jun '23

07 Jun '23

Hi there, today I found this warning in the log of my relay (6A7551EEE18F78A9813096E82BF84F740D32B911): Jun 03 04:04:33.000 [warn] Possible compression bomb; abandoning stream. Jun 03 04:04:33.000 [warn] Unable to decompress HTTP body (tried Zstandard compressed, on Directory connection (client reading) with 199.58.81.140:80). What does this mean? Regards

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Providing metrics relevant to relay operators
by Georg Koppen 07 Jun '23

07 Jun '23

Hello! I got recently pinged by a large exit operator asking whether we had a website with nice graphs and statistics relevant to relay operators on our project infrastructure (showing e.g. the largest exit operators etc.), but that's currently not the case and we should fix that. There are some third-party tools, like OrNetStats[1], but we think it would be very useful for our relay operators to have relevant information available on the Tor Project website itself. Those third-party projects are a good contribution to the overall ecosystem we have but might e.g. die at some point due to lack of maintenance or move their focus to particular parts of the network while neglecting others, which is fine in general. However, we as a project should make sure our relay operators and we ourselves are not losing important insights into the state of the network and its different relay groups in case anything like that happens. At the end of the day those statistics and graphs should show up on metrics.torproject.org but we are not there yet given the complex nature of that website and our plans to fix that. However, thanks to our efforts of setting up a database containing all the relay descriptors and other network documents and our ongoing Google Summer of Code project for making those accessible with the help of a network status API we can start to experiment with providing those statistics early on via a different venue. I've just filed a ticket tracking that process[2] for those of you who are interested. As always we are very much interested in collaboration and getting feedback from all of you. So, if you have particular statistics and graphs you would like to see on such a website, please speak up! Ideally, this would happen on the above-mentioned Gitlab issue but just replying to this thread or in private is fine as well. Thanks, Georg [1] https://nusenu.github.io/OrNetStats/ [2] https://gitlab.torproject.org/tpo/network-health/metrics/website/-/issues/4…

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Tor Relay Operator Poll (closes on 2023-05-30)
by nusenu 27 May '23

27 May '23

Hi, want to help shape the future of the Tor network? Here is a poll for you: https://cryptpad.fr/form/#/2/form/view/VE-b3bd-IS1P17Povh0ryIHYhqGqEiA7sJMR… It is open until 2023-05-30. Only operators that did run relays/bridges before 2023-04-01 (and are still running) may participate. An AROI or a relay fingerprint (or hashed bridge fingerprint) is required to participate. This poll happens in the context of working on a network health proposal. The goal of this poll is * to gather input from non-malicious relay operators * to help make pragmatical design decisions for an upcoming network health proposal * to ensure it remains practical to implement for relay operators * to get a feeling on whether it has a chance to see actual real world adoption * to get a feeling on whether relay operators would participate in a web of trust * to get a feeling on what type of rules relay operators would find acceptable In the light of malicious entities this poll has been send to large relay operators a few days ago so they can claim their submission first. Their feedback was also used to improve and extend the poll, if you submitted it already once you can submit it again but ensure to submit the same random string at the end as you did the first time so they can be linked. kind regards, nusenu -- https://nusenu.github.io

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ContactInfo semantics
by nusenu 26 May '23

26 May '23

This is probably of interest to many relay operators: https://gitlab.torproject.org/tpo/community/relays/-/issues/71 > Write proposal to restrict contact information field to email address (and make it mandatory) https://gitlab.torproject.org/tpo/core/arti/-/issues/870 > Restrict contact information field in arti to just allow an email address kind regards, nusenu -- https://nusenu.github.io

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Configuring key expiration warning messages?
by telekobold 22 May '23

22 May '23

Hi everyone, I'm using OfflineMasterKey 1 for my Tor bridge, hosting and renewing the long-term identity key on a Tails USB stick. I observed that Tor starts printing warning messages to /var/log/tor/notices.log 24 hours before the intermediate key expires. My question is if there is a flag that could be set in the torrc file to start printing these warning message more than 24 hours before the expiration time, possibly even with outputting the exact expiration time? If there isn't such an option, does anyone happen to have a script ready for this (before I start trying to implement something like this myself)? Kind regards telekobold

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Tor Relay Operator Meetup - April 15th, 2023 at 19 UTC
by gus 22 May '23

22 May '23

Hello, The next Tor Relay Operator Meetup will happen on April 15th, 2023, at 19 UTC. We're still working on the agenda, feel free to add your topics and/or questions on the pad: https://pad.riseup.net/p/tor-relay-op-meetup-april-keep onionsite: http://kfahv6wfkbezjyg4r6mlhpmieydbebr5vkok5r34ya464gqz6c44bnyd.onion/p/tor… WHERE Room link: https://tor.meet.coop/gus-og0-x74-dzn Registration No need for a registration or anything else, just use the room-link above. We will open the room 10 minutes before so you can test your mic setup. Please share with your friends, social media and other mailing lists! Gus -- The Tor Project Community Team Lead

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mulitply ipv6 bridge lines for a single bridge
by Toralf Förster 21 May '23

21 May '23

Given that hosters of a VPS often gives a big /48, /56 or /64 ipv6 subnet to a VPS I do wonder if the BridgeLine for ipv6 could benefit from that? With ip6tables -t nat -I PREROUTING -p tcp -j DNAT --to-destination [obfs4 address] /usr/sbin/ip6tables-save > /etc/iptables/rules.v6 all incoming TCPv6 packets would be flow to the bridge address. This idea is implemented in [1]. BTW there I do change the factory default ipv6 address into a random one too. [1] https://github.com/toralf/tor-relays/blob/main/playbooks/roles/setup/tasks/… -- Toralf

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PSA: Tor 0.4.5 reaches end of life (EOL) on 2023-02-15
by Georg Koppen 17 May '23

17 May '23

Hello! In case it affects you as you are still running your relay or bridge on Tor 0.4.5.x: the 0.4.5 series is going EOL on *2023-02-15* (roughly in 3 weeks from now). That's currently still 760 relays, which means roughly 7% of the advertised bandwidth of the network (and 387 bridges, which means roughly 9% of the advertised bridges bandwidth). Please make sure you have upgraded to the 0.4.7.x series by then. Supported releases in general can be found on the network team wiki.[1] Thanks, Georg [1] https://gitlab.torproject.org/tpo/core/team/-/wikis/NetworkTeam/CoreTorRele…

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Re: [tor-relays] MyFamily
by denny.obreham＠a-n-o-n-y-m-e.net 16 May '23

16 May '23

trinity pointard <trinity.pointard(a)gmail.com> wrote .. > . It's not as easy as having a unique ID, you need to make sure a > relay can't spoof being part of a family, that's why it requires a two > way relationship for now, and will probably use some form of signature > in the future. Why not take advantage of the proof entry of ContactInfo? ( https://nusenu.github.io/ContactInfo-Information-Sharing-Specification/#pro… ) All you need to do is to add a file like https://example.com/.well-known/tor-relay/family-rsa-fingerprint.txt (uri-rsa) or DNS TXT record family-fingerprint.example.com (dns-rsa) which would contain one of the relay fingerprints of the family (the same one for all relays). The name is thus unique and you can easily check if the family name and corresponding relay fingerprint are linked to the same relay operator. The only drawback is if the chosen relay for the family name is removed from the network then a new one will have to be chosen and all the MyFamily values changed on every relay. Most likely a very rare event. Heck, a file https://example.com/.well-known/tor-relay/rsa-fingerprint.txt has already the same content as MyFamily. (Which I am guessing is one way "Alleged Family Members" are identified on Tor metrics.) _________________ > For an easy example, let's imagine that we let any relay put itself > into any family. Now suppose the attacker starts three relays A1, A2, > and A3. Then, since nothing stops them, they put A1 into a family > with every relay on the network, except for A2 and A3. Now, any time > a user (randomly) selects A1, they will find that the only other > relays they can use on that circuit are A2 and A3; this will build a > completely attacker-controlled path, they will get no privacy. How can you find a family with every relay on the network? According to the proposal, the largest family has 270 members and, according to Tor metrics, they are about 2000 exit relays. Even assuming an attacker controls A1 and A2, both falsely belonging to two different families with 250 members each (assuming all exit relays), the attacker would just increase his chances of having his A3 exit relay to be selected from 1/2000 to 1/1500. Not nothing, but not a large advantage either. The problem you are describing is actually one that is possible RIGHT NOW with MyFamily. An attacker CAN list all relay fingerprints he can find in its MyFamily except his relays. If he could only list ONE family name, he could only spoof it with the most popular family name used (assuming family name uniqueness is not enforced and more than one relay operator use the same name). But it is impossible that all [good] relay operators use the same family name, even if they would be allowed to select one as simple as "Smith". MyFamily with a single name seems both a very tiny spoofing problem AND an improvement over the current configuration.

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