Repost, because filtering; there might be a point of confusion here that's causing the problem. As I understand it, the user agent sanitisation is expected to apply to EventLogging data, and data in the Analytics pipeline, but not data streaming into MediaWiki proper - namely, the cu_changes table. Nuria, is that the case?


On 27 March 2014 08:16, Nuria Ruiz <nuria@wikimedia.org> wrote:
>Rather than having an ethical debate over it, we could always test the actual usefulness with Science. That way we'd be able to see how much granularity each additional component adds to the data.
I kind of feel we are going backwards as we throughly discussed this point, technical info and references regarding entropy and user agents and fingerprinting can be found here:
https://www.mediawiki.org/wiki/EventLogging/UserAgentSanitization



On Thu, Mar 27, 2014 at 3:49 PM, Oliver Keyes <okeyes@wikimedia.org> wrote:
+1. I'm totally down for keeping less information around, but if it gets in the way of people doing their job?

Rather than having an ethical debate over it, we could always test the actual usefulness with Science. That way we'd be able to see how much granularity each additional component adds to the data.


On 27 March 2014 07:15, Aaron Halfaker <ahalfaker@wikimedia.org> wrote:
Including more information on the UA, while being covered by legal under the new privacy policy, really goes agains the wishes of the community as they do not wish to be finger printed. 

I don't think that "the wishes of the community" have been established and the whole point of checkuser is that it allows for fingerprinting.


On Thu, Mar 27, 2014 at 4:20 AM, Nuria Ruiz <nuria@wikimedia.org> wrote:

>As a checkuser, user agents are an important part of my workflow for identifying that multiple accounts are owned by the same person. 
> So I'm going to have to argue for including more information in the user agent.

Including more information on the UA, while being covered by legal under the new privacy policy, really goes agains the wishes of the community as they do not wish to be finger printed. 
There has been plenty more discussions about this on analytics e-mail list.


>Your proposed user agent would basically mean that every single person using the most up-to-date version of the app on a particular platform would >be indistinguishable from each other. This would, unfortunately, lead to lots of innocent users getting blocked as sockpuppets.

However, note that the UA " WikipediaApp/<version> <OS>/<form-factor>/<version>" clearly satisfies the use case of the mobile team. It provides as much information as they need from their user without sending any private data.

Can you please list what is your use case? Namely how are you identifying "false" accounts. Perhaps relying on the user agent to do so is not the best strategy going forward. Have in mind that with the old privacy policy UA data needed to be discarded after 90 days. With the new policy there is more legal room but given community feedback analytics team is planning on aggregating all UA information in the future. This means that UA data will not be stored (or reported) per user or request but rather agreggated (as in "4% of users use iPhone"). 

We gathered recently information from all teams as to use cases pertaining UA data collection:

Let's talk about your use case and add it to the document that already exists describing usages of user agent data, this document was sent out to all teams couple months ago but there is no description of your use case there:






On Wed, Mar 26, 2014 at 11:20 PM, Dan Garry <dgarry@wikimedia.org> wrote:
Hey Yuvi,

As a checkuser, user agents are an important part of my workflow for identifying that multiple accounts are owned by the same person. So I'm going to have to argue for including more information in the user agent. Your proposed user agent would basically mean that every single person using the most up-to-date version of the app on a particular platform would be indistinguishable from each other. This would, unfortunately, lead to lots of innocent users getting blocked as sockpuppets.

Here's an example of a user agent from an iPhone using Safari: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_1 like Mac OS X; zh-tw) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8G4 Safari/6533.18.5

Look at all of that wonderful information! ;-) In general, the more information you can include without breaching the user's privacy, the better.

I'd be happy to work with you on this.

Thanks,
Dan

P.S. You may also want to consult with the legal team, to ensure that an unacceptable levels of private information are not given out. They would also make a complement for me; I would likely be pulling in the direction of "MOAR INFORMATION!", whereas they would likely be pulling in the direction of "LESS INFORMATION!". :-)


On 26 March 2014 15:00, Yuvi Panda <yuvipanda@gmail.com> wrote:
Add Analytics to cc, as I think they'll be interested as well :)

On Thu, Mar 27, 2014 at 3:20 AM, Yuvi Panda <yuvipanda@gmail.com> wrote:
> Hello!
>
> We are getting closer to a general release of the Wikipedia Android
> and iOS apps, and I think we should standardize on a User-Agent
> format. The old app just appended an identifier in front of the
> phone's default UA[1] but I think we can do better, to avoid privacy
> concerns[2].
>
> How about:
>
> WikipediaApp/<version> <OS>/<form-factor>/<version>
>
> This gives us all the info we need (App version, OS, Form Factor
> (Tablet / Phone) and OS version) without giving away too much. It is
> also fairly simple to construct and parse.
>
> For the latest alpha, my Nexus 4 would generate
>
> WikipediaApp/32 Android/Phone/4.4
>
> While an iOS device might generate
>
> WkipediaApp/2.0 iOS/Phone/7.1
>
> form-factor would just be Phone|Tablet for now, and can be expanded
> later if necessary.
>
> Thoughts?
>
> [1]: https://www.mediawiki.org/wiki/Mobile/User_agents#Apps
> [2]: https://www.mediawiki.org/wiki/EventLogging/UserAgentSanitization
> --
> Yuvi Panda T
> http://yuvi.in/blog



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