- tor-relays - lists.torproject.org

Tor: Possible bug on 0.4.8.9 exit relay.
by George Hartley 18 Dec '23

18 Dec '23

Hi, while going through journalctl I noticed the following entries from my exit relay and wanted to report this non-fatal assertion. I also host a Guard relay on the same VM and IP, and it did not yet assert that message. The full assert() with the stack-trace is as follows: > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] tor_bug_occurred_(): Bug: src/core/or/conflux.c:565: conflux_pick_first_leg: Non-fatal assertion !(smartlist_len(cfx->legs) <= 0) failed. (on Tor 0.4.8.9 )Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: Tor 0.4.8.9: Non-fatal assertion !(smartlist_len(cfx->legs) <= 0) failed in conflux_pick_first_leg at src/core/or/conflux.c:565. Stack trace: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(log_backtrace_impl+0x5d) [0x5fdf47b6a9ad] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_bug_occurred_+0x194) [0x5fdf47b81764] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(conflux_decide_next_circ+0x3fe) [0x5fdf47c2031e] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(circuit_get_package_window+0x6d) [0x5fdf47c285ed] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x9bc59) [0x5fdf47b15c59] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(connection_edge_package_raw_inbuf+0xa9) [0x5fdf47b15e39] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(connection_edge_process_inbuf+0x76) [0x5fdf47c42866] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x1c0218) [0x5fdf47c3a218] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x6e72d) [0x5fdf47ae872d] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libevent-2.1.so.7(+0x22c45) [0x7d444a49cc45] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libevent-2.1.so.7(event_base_loop+0x4ff) [0x7d444a49e3af] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(do_main_loop+0x104) [0x5fdf47ae8f44] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_run_main+0x215) [0x5fdf47aed165] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_main+0x5e) [0x5fdf47aed5ee] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(main+0x1d) [0x5fdf47adf08d] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libc.so.6(+0x27cd0) [0x7d4449a7ecd0] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libc.so.6(__libc_start_main+0x8a) [0x7d4449a7ed8a] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(_start+0x25) [0x5fdf47adf0e5] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: Matching client sets: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_log_set(): Bug: Conflux 21CEFB4FACA11A02: 0 linked, 0 launched. Delivered: 7272; teardown: 0; Current: (nil), Previous: (nil) (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: Matching server sets: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_log_set(): Bug: Conflux 21CEFB4FACA11A02: 0 linked, 0 launched. Delivered: 7272; teardown: 0; Current: (nil), Previous: (nil) (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: End conflux set dump (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] circuit_get_package_window(): Bug: Conflux has no circuit to send on. Circuit 0x5fdf581d3460 idx 4524 marked at line src/core/or/command.c:663 (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] tor_bug_occurred_(): Bug: src/core/or/conflux.c:565: conflux_pick_first_leg: Non-fatal assertion !(smartlist_len(cfx->legs) <= 0) failed. (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: Tor 0.4.8.9: Non-fatal assertion !(smartlist_len(cfx->legs) <= 0) failed in conflux_pick_first_leg at src/core/or/conflux.c:565. Stack trace: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(log_backtrace_impl+0x5d) [0x5fdf47b6a9ad] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_bug_occurred_+0x194) [0x5fdf47b81764] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(conflux_decide_next_circ+0x3fe) [0x5fdf47c2031e] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(circuit_get_package_window+0x6d) [0x5fdf47c285ed] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x9bc59) [0x5fdf47b15c59] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(connection_edge_package_raw_inbuf+0xa9) [0x5fdf47b15e39] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(connection_edge_process_inbuf+0x76) [0x5fdf47c42866] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x1c078f) [0x5fdf47c3a78f] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(+0x6e72d) [0x5fdf47ae872d] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libevent-2.1.so.7(+0x22c45) [0x7d444a49cc45] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libevent-2.1.so.7(event_base_loop+0x4ff) [0x7d444a49e3af] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(do_main_loop+0x104) [0x5fdf47ae8f44] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_run_main+0x215) [0x5fdf47aed165] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(tor_main+0x5e) [0x5fdf47aed5ee] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(main+0x1d) [0x5fdf47adf08d] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libc.so.6(+0x27cd0) [0x7d4449a7ecd0] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/lib/libc.so.6(__libc_start_main+0x8a) [0x7d4449a7ed8a] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] Bug: /usr/bin/tor(_start+0x25) [0x5fdf47adf0e5] (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: Matching client sets: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_log_set(): Bug: Conflux 21CEFB4FACA11A02: 0 linked, 0 launched. Delivered: 7272; teardown: 0; Current: (nil), Previous: (nil) (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: Matching server sets: (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_log_set(): Bug: Conflux 21CEFB4FACA11A02: 0 linked, 0 launched. Delivered: 7272; teardown: 0; Current: (nil), Previous: (nil) (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] conflux_pick_first_leg(): Bug: End conflux set dump (on Tor 0.4.8.9 ) > Dec 14 16:29:36 matrix tor[575]: Dec 14 16:29:36.000 [warn] circuit_get_package_window(): Bug: Conflux has no circuit to send on. Circuit 0x5fdf581d3460 idx 4524 marked at line src/core/or/command.c:663 (on Tor 0.4.8.9 ) Note how it happened twice for the same circuit. This is the relays configuration: > # Main Config > User tor > ORPort 443 IPv4Only > DirPort 0 > SOCKSPort 0 > ControlPort 9051 > ShutdownWaitLength 60 > CookieAuthentication 1 > Nickname TrafficGuardExit > RelayBandwidthRate 12500 KBytes > RelayBandwidthBurst 15000 KBytes > DataDirectory /var/lib/tor/tor_exit > ContactInfo 0x576768BA hartley_george(a)proton.me > > # Exit Policy > > ExitPolicy reject *:22 > ExitPolicy reject *:25 > ExitPolicy accept *:* > > # Node Family > > MyFamily $AF42E6C77196A37F041A1A1E953E51B4656BDC1B, $7F7D1A5BE88FA7C9358955705AE7AFA61EEDA2B0 > > # Acceleration > > HardwareAccel 1 > NumCPUs 4 > > # Sandboxing > > Sandbox 1 I will try to cooperate as best as possible, but my life is kind of messy right now. And because of TROVE-2023-007, I will have to update the relay to version 0.4.8.10, and reading the change-log of that version, it might actually fix this assert. Still wanted to let you guys know.

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Issue with Relay Status Discrepancy on Tor Metrics
by Jan 18 Dec '23

18 Dec '23

Dear Tor Metrics Support Team, I hope this message finds you well. I am writing to report an issue regarding the status of my relay on Tor Metrics. According to Nyx, my relay appears to be running without any problems. However, Tor Metrics indicates that it is offline. Relay Details: Name:BtcToTheMoon IP Address: 116.203.227.107 Contact Email: janthor007(a)gmail.com I have verified through Nyx that the relay is operational, yet the status on Tor Metrics remains unchanged. I am concerned about this discrepancy and would appreciate any assistance in resolving this matter. Thank you for your attention to this issue. Your help in rectifying this discrepancy would be greatly appreciated. Sincerely, Michal

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Running a high-performance pluggable transports Tor bridge (FOCI 2023 short paper)
by David Fifield 11 Dec '23

11 Dec '23

Linus Nordberg and I wrote a short paper that was presented at FOCI 2023. The topic is how to use all the available CPU capacity of a server running a Tor relay. This is how the Snowflake bridges are set up. It might also be useful for anyone running a relay that is bottleneck on the CPU. If you have ever run multiple relays on one IP address for better scaling (if you are one of the relay operators affected by the recent AuthDirMaxServersPerAddr change), you might want to experiment with this setup. The difference is that all the instances of Tor have the same relay fingerprint, so they operate like one big relay instead of many small relays. https://www.bamsoftware.com/papers/pt-bridge-hiperf/ > The pluggable transports model in Tor separates the concerns of > anonymity and circumvention by running circumvention code in a > separate process, which exchanges information with the main Tor > process over local interprocess communication. This model leads to > problems with scaling, especially for transports, like meek and > Snowflake, whose blocking resistance does not rely on there being > numerous, independently administered bridges, but which rather forward > all traffic to one or a few centralized bridges. We identify what > bottlenecks arise as a bridge scales from 500 to 10,000 simultaneous > users, and then from 10,000 to 50,000, and show ways of overcoming > them, based on our experience running a Snowflake bridge. The key idea > is running multiple Tor processes in parallel on the bridge host, with > externally synchronized identity keys.

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obfs4 bridge management
by Christopher Sheats 10 Dec '23

10 Dec '23

Hello, I've has published a shell script for deploying and managing obfs4 bridges, I hope its useful to others. https://github.com/emeraldonion/bridge-management/ Feedback welcome! -- yawnbox https://disobey.net/@yawnbox https://digitalcourage.social/@EmeraldOnion

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Exit operators on the 0.4.8.x series, please upgrade to 0.4.8.10 ASAP!
by Georg Koppen 10 Dec '23

10 Dec '23

Hello exit node operators! Today (2023-12-08) the Network Team has released a new Tor version, 0.4.8.10[1]. This update contains a fix to a remotely triggerable crash bug (TROVE-2023-007) affecting exit relays on the 0.4.8.x series. Please upgrade as soon as possible to maintain network stability and security if your relays are on that series. For those of you running their Tor relays using the Tor Debian repository, expect a new deb package to be available soon. Please note that this bug is specific to Tor exit relays on the 0.4.8.x series and does not impact other relays nor Tor clients or Tor powered apps (Tor Browser, Orbot, OnionShare). Thanks, Georg [1] https://forum.torproject.org/t/security-release-0-4-8-10/10536

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Relay question
by Mulloch94 08 Dec '23

08 Dec '23

Greetings, I was directed to this relay subscription by the owner. I've recently started my own relay and everything has went smooth for the first few days. Then the relay mysteriously went offline for a period of 8-9 hours. Happened while I was sleeping I think, but any rate it came back on after I restarted the tor daemon and rebooted the server. I'm starting to think my firewall configurations might have been the culprit, even though I ran a very rudimentary setup. Basically just: -A INPUT -p tcp --dport <my SSH> -j ACCEPT -A INPUT -p tcp --dport 9050 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -j DROP Default ACCEPT on OUTPUT My ORPort is on 443, so I don't see how this could be interfering. I noticed my server reboot got rid of all my rules, so I'm thinking that could've been the issue. If so, what other ports should I add? Do I even need a firewall for the relay? I don't do anything else with that server, so If it doesn't need a firewall to stay secure I won't use one. One more thing, I had a flag on my relay that said I needed to "update the descriptor." It went away after rebooting my server as well, could that been the issue? Sent with [Proton Mail](https://proton.me/) secure email.

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Re: [tor-relays] Relay question
by denny.obreham＠a-n-o-n-y-m-e.net 08 Dec '23

08 Dec '23

For your firewall settings, you will find everything you need here: https://github.com/Enkidu-6/tor-ddos/ It is the common setting for most Tor operators. Although, I don't think it is the source of your problem and I wouldn't worry too much about it unless it happens repeatedly. The log in "/var/log/syslog" might give you some helpful hints. Denny On 12/07/2023 10:19 PM Mulloch94 via tor-relays <tor-relays(a)lists.torproject.org> wrote .. > Greetings, I was directed to this relay subscription by the owner. I've recently > started my own relay and everything has went smooth for the first few days. Then > the relay mysteriously went offline for a period of 8-9 hours. Happened while I > was sleeping I think, but any rate it came back on after I restarted the tor daemon > and rebooted the server. I'm starting to think my firewall configurations might > have been the culprit, even though I ran a very rudimentary setup. Basically just: > -A INPUT -p tcp --dport <my SSH> -j ACCEPT > -A INPUT -p tcp --dport 9050 -j ACCEPT > -A INPUT -p tcp --dport 443 -j ACCEPT > -A INPUT -p tcp --dport 80 -j ACCEPT > -A INPUT -j DROP > > Default ACCEPT on OUTPUT > > My ORPort is on 443, so I don't see how this could be interfering. I noticed my > server reboot got rid of all my rules, so I'm thinking that could've been the issue. > If so, what other ports should I add? Do I even need a firewall for the relay? > I don't do anything else with that server, so If it doesn't need a firewall to > stay secure I won't use one. One more thing, I had a flag on my relay that said > I needed to "update the descriptor." It went away after rebooting my server as > well, could that been the issue? > > Sent with [Proton Mail](https://proton.me/) secure email.

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EFF's university Tor relay campaign
by Roger Dingledine 08 Dec '23

08 Dec '23

Hi folks! EFF has launched their advocacy campaign for getting more Tor relays running at universities: https://toruniversity.eff.org/ https://www.eff.org/deeplinks/2023/08/announcing-tor-university-challenge https://www.eff.org/press/releases/eff-launches-tor-university-challenge We're focusing on universities in particular, not just to get more capacity for the Tor network, but also to strengthen the connections between the Tor network and academia. Universities are great locations for Tor relays for education (Tor is part of every cybersecurity curriculum these days), for community (growing connections between students and research groups), and for research (helping the Tor network stay strong so people can use it for research): https://toruniversity.eff.org/administrators/ https://blog.torproject.org/tor-heart-pets-and-privacy-research-community/ Having more relays at universities is especially useful because it can help others to see that running a relay is a normal and straightforward thing to do. So: if you are at a university, or you know somebody who is and want to help them, please consider setting up relays there. It can be anything from an exit relay (the most useful to Tor users, but the most work in terms of local advocacy and relationship-building), to a non-exit relay (still very useful to Tor users, because we need more network diversity), to a non-NATed Snowflake bridge (currently used most by people in Iran to get around their censorship and reach the Tor network). We started the campaign with thirteen institutions that are already running relays and/or other public infrastructure pieces: Technical University Berlin (Germany) Boston University (US) University of Cambridge (England) Carnegie Melon University (US) University College London (England) Georgetown University (US) Johannes Kepler Universität Linz (Austria) Karlstad University (Sweden) KU Leuven (Belgium) University of Michigan (US) University of Minnesota (US) Massachusetts Institute of Technology (US) University of Waterloo (Canada) Hopefully this list will make you impressed / excited / jealous and you will want to get your university onto it. :) Later steps in the campaign will be to understand which universities have IT departments that understand and value Tor, and which ones try to block you from using Tor on their network or block Tor users from reaching their webservers. We are also imagining to do an OONI workshop to help people do "how well does Tor work on this network" tests. Here is the internal coordination/roadmap ticket if you want to follow along in detail: https://gitlab.torproject.org/tpo/community/relays/-/issues/67 Thanks! --Roger

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Correction to Good Bad ISPs, UK
by code9n＠pm.me 02 Dec '23

02 Dec '23

Hi, This is probably the wrong place but here is a minor update to the Good / Bad ISPs page: http://xmrhfasfg5suueegrnc4gsgyi2tyclcy5oz7f5drnrodmdtob6t2ioyd.onion/relay… The company HostWorld in the UK does allow guard and middle relays but just refused me permission to change mine to an exit node. That's today, 2023-12-02. They're pretty good, I've had no problems, efficient customer support, unlimited bandwidth, but 'no' to exit relays. I don't know about bridges. ASN : AS42831. regards,

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recommended way to run 0.4.7 on armhf?
by ilf 25 Nov '23

25 Nov '23

What's the recommended way to run 0.4.7 on armhf? > The package repository [deb.torproject.org] does not offer 32-bit ARM > architecture (armhf) images (yet). https://support.torproject.org/apt/tor-deb-repo/ Debian has 0.4.7 in bullseye-backports. But Raspbian doesn't have bullseye-backports: http://raspbian.raspberrypi.org/raspbian/dists/ -- ilf If you upload your address book to "the cloud", I don't want to be in it.

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