tor-relays September 2017

tor-relays@lists.torproject.org

61 participants
46 discussions

Re: [tor-relays] Fwd: Your TOR [sic] node
by Dennis Emory Hannon 10 Sep '17

10 Sep '17

So let me get this straight - Because you don't agree with the way I'm marketing my network I must be malicious and this must be a "social engineering" attack? Seriously guys, put away the tin foil hats. I truly DON'T want to know what people on tor are browsing. If you 'd like to waste your time on baseless assumptions go right ahead. -Dennis

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Fwd: Your TOR [sic] node
by Matt Traudt 09 Sep '17

09 Sep '17

I just got this guy's spam too. It doesn't look like anything anyone said to him last month[0] stuck. His intentions are now very suspicious to me too. I will definitely not be pointing anything at his servers. Matt [0]: https://lists.torproject.org/pipermail/tor-relays/2017-August/012735.html -------- Forwarded Message -------- Subject: Your TOR node Date: Fri, 8 Sep 2017 21:36:14 -0400 From: Dennis Emory Hannon <info(a)backplanedns.org> To: Dennis Emory Hannon <info(a)backplanedns.org> Hello, I came across your TOR relay on atlas. I run a few relays myself along with a bunch of DNS resolvers which are a part of the Open Root Server network (ORSN.org) - aimed to fight internet censorship and circumvent government surveillance programs (ie. prism). I hope you may be interested in using our anonymous open DNS resolvers on your relays. https://BackplaneDNS.org Resolver - 172.98.193.42 Resolver - 162.248.241.94 ------------------------------------------------------ Hostmaster@: Mr. Dennis Emory Hannon Phone: +1 (716) 348-0064 E-Mail: info(a)backplanedns.org abuse(a)backplanedns.org Linkedin: http://linkedin.com/in/dennis-hannon-52236019/

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Rate setting in tor
by r1610091651 08 Sep '17

08 Sep '17

Hi I've a question regarding the rate setting in torrc and tor honoring it. I've set up a tor relay with following rate settings: RelayBandwidthRate 2048 KBytes RelayBandwidthBurst 2048 KBytes But using arm, I'm seeing that tor is not honoring these settings, with bursts frequently exceeding the value. The average rate control seems to be working fine though. [image: image.png] What am I missing? I'm running 0.3.0.10 on Linux. Thanks

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Force OpenSSL AES-NI usage on a VPS without the AES CPU flag passthrough
by Roman Mamedov 06 Sep '17

06 Sep '17

Hello, Today I found that it is possible to force OpenSSL enable the use of CPU AES acceleration even if it doesn't detect the "aes" CPU flag. Many VPS hosts configure their hypervisors in a way that does not have the flag passed through into VPSes, even though all their host nodes surely have CPUs with support for AES-NI. In my experience hosts have not been forthcoming in reconfiguring their systems to include that flag passthrough. But it turns out we can force OpenSSL to believe AES is supported, even if the CPU does not report it. This can be done with the "OPENSSL_ia32cap" environment variable. Searching around, all I found was scenarios to use it for disabling AES-NI (for testing), e.g.: https://mjanja.ch/2013/11/disabling-aes-ni-on-linux-openssl/ I believe the syntax used there applies "xor" over the real flag values, e.g. OPENSSL_ia32cap="~0x200000200000000" to disable AES. But what if you need to force-enable it. Turns out the syntax working for that is simply: OPENSSL_ia32cap="+0x200000200000000" Let's take one VPS box with the aforementioned problem. # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : QEMU Virtual CPU version 1.5.3 stepping : 3 microcode : 0x1 cpu MHz : 1695.729 cache size : 4096 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 4 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl eagerfpu pni cx16 hypervisor lahf_lm bugs : bogomips : 3391.45 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management: As you can see "aes" is not present. Testing OpenSSL speed in the default configuration. # openssl speed -elapsed -evp aes-128-gcm ... type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes 16384 bytes aes-128-gcm 32332.17k 40365.80k 42265.77k 42376.19k 43196.42k 43401.22k And now we force AES hardware acceleration usage: # OPENSSL_ia32cap="+0x200000200000000" openssl speed -elapsed -evp aes-128-gcm ... type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes 16384 bytes aes-128-gcm 59047.07k 104467.39k 141712.21k 151093.93k 158321.32k 156827.65k Almost 4 times faster! For Tor this leads to higher bandwidth utilization and lower CPU usage (which will actually make your VPS host happier :) But how to apply that to Tor? Well, for some initial testing I just chose to add the following line to /etc/init.d/tor (not using systemd here), right after "#! /bin/bash": export OPENSSL_ia32cap="+0x200000200000000" (but this will get overwritten and removed by the next Tor version upgrade). Seems to work just fine, my CPU usage is half of what it was before, at similar bandwidth levels. So now it has headroom to ramp up further. A word of caution, firstly always test as shown above to verify that it works. I believe if the underlying CPU actually doesn't support AES, all programs trying to use it, including "openssl speed", will crash outright, with an incorrect instruction error, or somesuch. So there is no risk to jeopardize encryption strength or security of Tor. Also even if it works now, it may stop working down the line if the host migrates your VPS to a node with older CPU, one which doesn't support AES. But migrations of customers between do not happen very often, and in fact all CPUs used today in a hosting environment should support AES, as that's been implemented in server (and even desktop) CPUs a very very long time ago. (Apologies for double-post, I realized tor-relays should have been the better place to post). -- With respect, Roman

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Re: [tor-relays] Any IP allocations available out there?
by Paul Templeton 05 Sep '17

05 Sep '17

> If you're interested in becoming your own ISP (obtaining your own ASN, > IPv6 and IPv4 scopes), you'll need to apply via APNIC, as I did in the > US with ARIN. Here is an example: Would if I could - but here in AU you have to log all metadata for two years if you are an ISP. I either listen to what others have stated and host overseas or host overseas... I might be able to get a 20/20Mbs fibre for AU$250 - Just waiting to find out if they have data caps or not. Thanx all for your input. Paul PS - whats more important - More bandwidth for exit nodes or a faster presence in AU???

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Tor-arm failure
by Arisbe 03 Sep '17

03 Sep '17

Hello people, I'm not a python programmer so I need some help with a problem. I have a number of Tor nodes and some bridges. Occasionally, when I install tor_arm I get a divide by zero message as follows: Exception in thread Thread-69: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner selt.run() File "/usr/share/arm/util/sysTools.py", line 517, in runnewValues["cpuAvg"] = total CpuTime / uptime ZeroDivisionError: integer division or modulo by zero Exception in thread Thread-70 ...... I'm running debian jessie in this most recent example. 2 G memory, 20 G hdd. This is a bridge with only some daily use but typically 10-12 circuits. Does someone have experience debugging this problem? Thanks!

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tor-relays September 2017