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Reminder for weekly OONI IRC meeting: Monday 2016-04-18, 17:00 UTC in #ooni
by Vasilis 18 Apr '16

18 Apr '16

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hello everyone, This is a reminder for today's weekly OONI IRC meeting. It will happen as usual on the #ooni channel on irc.oftc.net at 17:00 UTC (18:00 CEST, 12:00 EST, 09:00 PST). Event Times around the world: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20160418T17 You can join via the web from: https://kiwiirc.com/client/irc.oftc.net/ooni Everybody is welcome to join us and bring their questions and feedback. ~Vasilis - -- Fingerprint: 8FD5 CF5F 39FC 03EB B382 7470 5FBF 70B1 D126 0162 Pubkey: https://pgp.mit.edu/pks/lookup?op=get&search=0x5FBF70B1D1260162 -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJXFPzGAAoJEF+/cLHRJgFizn8QAKJxwm4wXrtaHU6+ETvmROsZ 8kSIxdh56c6kUgFWyMkVTuEK6AN+RqiXi2TjoVONrFMMjhuLC75/DJwwZMOsTHIR 5afEvfxie+7yXRJVXmG1pzw6DmZBT0flNOdQ5Dq2CHkcXqk+AaDWdclbzGEInoQC qrovcvGn5JCHsTVdVxEwvsL+tDSL3aY2HbMt4zfZwgvI0UIg9C5K0xbr/wiOoiKx t2b7ASCGx3LtRNEa3KF37dhvk4saUsvwJgPZ7w7hGbXrkpcW+bZna0GifooRxd9Z zzKNSvPZzOYM5CQgXIDzMePRnzUtcX8fv3UK0AP9ePgsoA4esJp/ZIE0Pt3mO4tG LnHMv1P1rVGo9d8jeOLpsbYoxf2nB5pa58dcIo2nNsHu0YndAcpdFqQ/wrxdCrML Og+zBtZlqGYenJydfYOo/UypiUnKZfi3Qm2oFSqDbQDmDFk0+LKq6FIz9UUCOLJB URzdHUMo59waQLkEiXPbR9lLDIa37MM3fMnd1wXTThdbMiCTHTyckJzdbSB9LVLS 1fuBFxSyPpTtwuXYfpoWZU9HBNbc1wlpGZoyBvmIiGfWWfn0GGvnU/ZRRbJPgzb6 KV7/8B46YiWBHBIU8FvbOBt2YNPVPaN6jnuDQZ1Er1gW0J6xLCcZfPWMTiiWavzj i0WoEPfglGqcYc2CEii0 =btjJ -----END PGP SIGNATURE-----

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I wish to run an OONI node
by Virgil Griffith 13 Apr '16

13 Apr '16

I've recently discovered my condo internet is client to a large ISP that is an unusually aggressive blocker (even for Singapore). I would like to run a mode to better measure this. What is the protocol for doing so? It would be ideal just plug in a machine box and forget about it (raspberry pi, whatever). But if that doesn't exist I'm willing to put some work into this. -V

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Reminder for weekly OONI dev gathering Monday 2016-04-11 17:00 UTC (19:00 CEST)
by Arturo Filastò 11 Apr '16

11 Apr '16

Hello Oonitarians, This is a reminder that today there will be the weekly OONI gathering. It will happen as usual on the #ooni channel on irc.oftc.net at 17:00 UTC (19:00 CEST, 13:00 EST, 10:00 PST). You can join via the web from: https://kiwiirc.com/client/irc.oftc.net/ooni (Note: sometimes Tor is blocked by OFTC, but it should mask your IP if you trust that stuff). Everybody is welcome to join us and bring their questions and feedback. See you later, ~ Arturo

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Reminder for weekly OONI dev gathering Monday 2016-04-04 17:00 UTC (18:00 CEST)
by Arturo Filastò 04 Apr '16

04 Apr '16

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ooniprobe Web GUI Mockups
by poly 29 Mar '16

29 Mar '16

Hey, Here are the completed mockups we discussed during the meeting yesterday: https://darkdepths.net/drafts/ooniprobe-gui-mockup.html Best, poly

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Working with OONI reports; or, how we used OONI to find discrimination against Tor exits
by David Fifield 24 Mar '16

24 Mar '16

I am working on a project with Sheharbano Khattak, Sadia Afroz, Mobin Javed, Srikanth Sundaresan, Vern Paxson, Steven Murdoch, and Damon McCoy to measure how often web sites treat Tor users differently (by serving them a block page or a captcha, for example). We used OONI reports for part of the project. This post is about running our code and some general tips about working with OONI data. I hope it can be of some use to the ADINA15 participants :) The source code I'm talking about is here: git clone https://www.bamsoftware.com/git/ooni-tor-blocks.git One of its outputs is here, a big poster showing the web sites with the highest blocking rates against Tor users: https://people.torproject.org/~dcf/graphs/tor-blocker-poster-20150914.pdf I am attaching the README of our code. One of OONI's tests does URL downloads with Tor and without Tor. The code processes OONI reports, compares the Tor and non-Tor HTTP responses, and notes whenever Tor appears to be blocked while non-Tor appears to be unblocked. Our code is focused on the task of finding Tor blocks, but parts of it are generic and will be useful to others who are working with OONI data. The ooni-report-urls program gives you the URLs of every OONI report published at api.ooni.io. The ooni.py Python module provides an iterator over OONI YAML files that deals with encoding errors and compression. The classify.py Python module is able to identify many common types of block pages (e.g. CloudFlare, Akamai). Now some notes and lessons learned about working with OONI data. The repository of all OONI reports is here: http://api.ooni.io/ The web site doesn't make it obvious, but there is a JSON index of all reports, so you can download many of them in bulk (thanks to Arturo for pointing this out). Our source code contains a program called ooni-report-urls that extracts the URLs from the JSON file so you can pipe them to Wget or whatever. (Check before you start downloading, because there are a lot of files and some of them are big!) wget -O ooni-reports.json http://api.ooni.io/api/reports ./ooni-report-urls ooni-reports.json | sort | uniq > ooni-report-urls.txt The choice of a YAML parser really really matters, like 30× performance difference matters. See here: https://bugs.torproject.org/13720 yaml.safe_load_all(f) function is slow. yaml.load_all(f, Loader=yaml.CSafeLoader) is what you want to use instead. yaml.CSafeLoader differs slightly in its handling of certain invalid Unicode escapes that can appear in OONI's representation of HTTP bodies, for example separately encoded UTF-16 surrogates: "\uD83D\uDD07". ooni.py has a way to skip over records like that (there aren't very many of them). With yaml.CSafeLoader, findblocks takes about 2 hours to process 2.5 years of http_requests reports (about 33 GB compressed). There are some inconsistencies and format differences in some OONI reports, particularly very early ones. For example, the test_name field of reports is not always the same for the same test. We were looking for http_requests tests, and we had to match all of the following test_names: http_requests http_requests_test tor_http_requests_test HTTP Requests Test In addition, the YAML format is occasionally different. In http_requests reports, for example, the way of indicating that Tor is in use for a request can be any of: tor: true tor: {is_tor: true} tor: {exit_ip: 109.163.234.5, exit_name: hessel2, is_tor: true} And even in some requests, the special URL scheme "shttp" indicates a Tor request; e.g. "shttp://example.com/". The ooni.py script fixes up some of these issues, but only for the http_requests test. You'll have to figure it out on your own for other tests. A very early version of this processing code appeared here: https://lists.torproject.org/pipermail/ooni-dev/2015-June/000288.html

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Reminder for weekly OONI IRC meeting: Monday 2016-03-21, 17:00 UTC in #ooni
by Vasilis 21 Mar '16

21 Mar '16

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hello everyone, This is a reminder for today's weekly OONI IRC meeting. It will happen as usual on the #ooni channel on irc.oftc.net at 17:00 UTC (18:00 CEST, 12:00 EST, 09:00 PST). Event Times around the world: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20160321T17 Everybody is welcome to join us and bring their questions and feedback. ~Vasilis - -- Fingerprint: 8FD5 CF5F 39FC 03EB B382 7470 5FBF 70B1 D126 0162 Pubkey: https://pgp.mit.edu/pks/lookup?op=get&search=0x5FBF70B1D1260162 -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJW8BNhAAoJEF+/cLHRJgFie3QP/RK3GgYJ3LZrZpW2s9gnOAsn sI1vP/+0KcYSDmCv0fUwOs0807Dtb/LA8gXNhoVLRh+giU/i3/3bo/8WckwU2B7J UN9mcd6okRGmfCrRVC541arXBgi2X0bAnxXzjVnjlFqDImemWLLK0Zja6Vr48PDA Q4+2wE6hXhZCV56uqd1xx3HyG50LImbJvI8SqwtVQ99jefhlQo18ZWQPFkEPJKuD z5QBrGHNnhVjNMxQpktLOY6iimxHXg6ghhpKUSUpLRmYAO7DXIYSm0eZaSJA2arU l51MLXtXEKWT2DzDVQKfKgWSB7rORcVfyC4YlCueHy0Xq4R/fYLfYO4jw+tRIhri yM8Nj3Kifpsq2j7XyKJC6hDGTG74cxU6x00B/Kx6GtE0OJyHQ8I2iXspecyCS9c2 lEfHugsEbiKL0Qm02Zw6WF2QOG7ApfjMIv10fTfjg8TsXL61KJtW0IhxnpLqAAPy S+1sxn7sjtb/b9dDqw8E5u7QkVXvGVrlnm2zOG+o/9uxlbdNRS5Elh9Ojy4N1Sre po4v8mLmXN0oJgnSx3GHxLIGu7tZ7A7dq38H8u5s+LXEPZUfuCCga7R6e/b8XWy3 BwNt8BcDj7Aq5gHiTfEeW3kHrEbvMQmbifj+ly9BQXdAt8r/QXRBt+/YSBZ5MEIc UKi8Wir8n3+fK3NS5YHH =NNZq -----END PGP SIGNATURE-----

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Compressing reports?
by David Fifield 19 Mar '16

19 Mar '16

I just downloaded all the http_requests reports from https://measurements.ooni.torproject.org/. It took quite a long time and I wonder if we can make things more efficient by compressing the reports on the server. This is the command I ran to download the reports: wget -c -r -l 2 -np --no-directories -A '*http_requests*' --no-http-keep-alive https://measurements.ooni.torproject.org/ This resulted in 309 GB and 6387 files. If I compress the files with xz, xz -v *.json they only take up 29 GB (9%). Processing xz-compressed files is pretty easy, as long as you don't have to seek. Just do something like this: def open_xz(filename): p = subprocess.Popen(["xz", "-dc", filename], stdout=subprocess.PIPE, bufsize=-1) return p.stdout for line in open_xz("report.json"): doc = json.loads(line) ... Of course you can do the same thing with gzip.

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ooni-pipeline using local time zone when parsing timestamps
by David Fifield 17 Mar '16

17 Mar '16

Parts of the ooni-pipeline are using datetime.fromtimestamp instead of datetime.utcfromtimestamp. It means the timestamp will be parsed differently according to the time zone in which the code is run: https://github.com/TheTorProject/ooni-pipeline/blob/355ac1780f1f05eefb9ea3b… entry['test_start_time'] = datetime.fromtimestamp(entry.pop('start_time', 0)).strftime("%Y-%m-%d %H:%M:%S") https://github.com/TheTorProject/ooni-pipeline/blob/355ac1780f1f05eefb9ea3b… start_time = datetime.fromtimestamp(header.get('start_time', 0)) Now, it appears that there's no actual harm done by this bug, because it looks like the timestamps were read and written by someone in UTC+1, so the conversion evens out in the final JSON. But it could go wrong if run by someone in a different time zone. I noticed this because when I process the new JSON files, I get timestamps that are an hour different than I got parsing the YAML files. To parse the JSON times, I use datetime.datetime.strptime(..., "%Y-%m-%d %H:%M:%S"), which gives the correct answer because of the reason in the previous paragraph. My old YAML times were off by an hour, because I used datetime.datetime.utcfromtimestamp(...), parsing a UTC+1 timestamp as if it were UTC. Here's some related information I found while researching the above. It looks like individual test results are *also* using local timestamps, or have their clocks set wrong, or something. Because when I compare the "test_start_time" field to the "Date" header (which is always supposed to be UTC) in a response to an http_requests test, I get some widely divergent values (I saw up to around 9 hours). For example consider https://measurements.ooni.torproject.org/2015-01-01/20150101T060029Z-BE-AS2… It has a difference of about 6 hours: { "test_start_time":"2015-01-01 07:00:29", "test_keys": { "requests": [ { "response": { "headers": { "Date": "Thu, 01 Jan 2015 01:00:35 GMT" ... } } } ] }, probe_cc: "BE" } probe_cc is "BE", Belgium, which is supposed to be UTC+1, so I don't know where the 6-hour discrepancy is coming from. Note also that the timestamp in the file name is not the same: 060029. Here's a summary of the http_requests reports from 2015-01-01. Most of them match, but some are off by 6 or 1 hour: CC: CH test_start_time: 2015-01-01 03:00:28 Date: Thu, 01 Jan 2015 02:59:14 GMT +0 CC: BE test_start_time: 2015-01-01 07:00:29 Date: Thu, 01 Jan 2015 01:00:35 GMT +6 CC: FR test_start_time: 2015-01-01 09:41:08 Date: Thu, 01 Jan 2015 09:41:14 GMT +0 CC: FR test_start_time: 2015-01-01 10:47:20 Date: Thu, 01 Jan 2015 10:47:23 GMT +0 CC: NL test_start_time: 2015-01-01 12:42:16 Date: Thu, 01 Jan 2015 12:42:21 GMT +0 CC: NL test_start_time: 2015-01-01 15:41:32 Date: Thu, 01 Jan 2015 15:41:44 GMT +0 CC: CZ test_start_time: 2015-01-01 15:46:27 Date: Thu, 01 Jan 2015 15:46:34 GMT +0 CC: NL test_start_time: 2015-01-01 17:19:39 Date: Thu, 01 Jan 2015 17:19:43 GMT +0 CC: HK test_start_time: 2015-01-01 18:03:57 Date: Thu, 01 Jan 2015 17:04:10 GMT +1 CC: NL test_start_time: 2015-01-01 21:47:32 Date: Thu, 01 Jan 2015 21:47:37 GMT +0 I used this script: import json import sys for line in sys.stdin: doc = json.loads(line) try: probe_cc = doc["probe_cc"] test_start_time = doc["test_start_time"] for request in doc["test_keys"]["requests"]: response_time = request["response"]["headers"]["Date"] print "CC: %s test_start_time: %s Date: %s" % (probe_cc, test_start_time, response_time) except KeyError: pass

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test_start_time in JSON reports
by David Fifield 17 Mar '16

17 Mar '16

The YAML reports had two time fields: start_time: timestamp of the start of ooni-probe run test_start_time: timestamp of the start of each individual test Within a single report file, start_time was constant, while test_start_time would advance with each successive test, depending on how long each test took to run. The JSON format reports have just one of the fields, test_start_time, but it confusingly appears to have the same meaning as start_time in the old YAML reports (it doesn't change within a report file): test_start_time: timestamp of the start of ooni-probe run It might be because of this code: https://github.com/TheTorProject/ooni-pipeline/blob/355ac1780f1f05eefb9ea3b… entry['test_start_time'] = datetime.fromtimestamp(entry.pop('start_time', 0)).strftime("%Y-%m-%d %H:%M:%S") Some tests can take many minutes or hours to run, so by the end, the JSON test_start_time might be far off from the real time when it was run. Is there a way we could get both timestamps in each record again? What I'm doing now is incrementing a counter according to the test_runtime field of each record, and adding that counter to the test_start_time in order to estimate the individual test's start time. But I feel that is only approximate, and some older reports do not have test_runtime.

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