[Godel_unicode]

Or just open up the apk in e.g. apk studio and replace the bundled cert with the one from your mitm proxy. Effectively, that'll repin the app to your proxy specifically. There are more exotic pinning methods that this won't solve (the forever cat-and-mouse game) but it's good for many apps.

[rektide]

It's a problem that, alas, must be tackled somewhat uniquely on every platform, where-as previously users were free to manage their own Certificate Authorities as they wished. Now users are safe & secure from themselves. :/ Admittedly there were a lot of problems with poorly managed CA stores, users being abused, but cert-pinning feels like such a drastic overreach in preventing any form of user control.

Techniques like this "rebuild your apk" are interesting & good to have, but every OS needs it's own bag of tricks. It's probably not a total show-stopper, but news like today's that Windows 10 will only install signed driver software (an admittedly niche-ish case), the closed Apple store,... there's a lot of places side-loading is not an option. Do those apps get a pass, get to be complete black-box software that we the users have zero ability to look at or understand?

[1] https://www.zdnet.com/article/windows-10-will-start-blocking...

[Godel_unicode]

You're making this sound so much harder than it is, though. None of the techniques for bypassing the security enhancements is difficult, nor are they undocumented. Who are these hobbyists who want to reverse engineer the whispersync protocol but can't follow a simple tutorial to swap out a CA?

[rektide]

you've listed one platform (of many) where it's possible to (in some cases where there is a .cert or .pem file sitting in an apk), updated that apk pkg, & then use side-loading (not available on os'es) to install that hacked package.

there's a number of caveats to your steps, it will definitely not be this easy in all cases. and i while this wasn't all that difficult, it's still a situation where the OS is actively working to prevent the user from being able to understand their system. and most platforms don't provide even this much of an affordance, of opening, rebuilding, & side-loading packages.

[Godel_unicode]

You're making this sound so much harder than it is.

[rektide]

I sincerely do not think so & I genuinely & I think appropriately fear that humankind is quickly approaching an era where they have no power to understand what their softwares are doing.

This is already the case on iphone, I think. You have only outlined the most bare-basic case on Android. if certs were embedded this would not work. Who knows about osx & windows. It's much much much much harder & in many cases already impossible. The security people seem only to want to guard the applications, continually at the expense of the user. Who will fight for the user?

I think I am on the bead here.

[Godel_unicode]

I'm aware that you think that. What I'm struggling with is, in the face of all the evidence in this thread and others, why. This stuff is easy. It's well documented. There are YouTube videos literally (like, literally literally) walking through every step of the process. The fact that you specifically do not know how to do it right now doesn't mean it can't be done, or even that it's hard. The fact that your argument is "who knows about..." and not a specific example is a big clue that you might be baselessly worried about the sky falling. You claim that users are walled off, yet you haven't produced a single example of that being true.

The fact that the cost to exploit end user devices in an irreversible, hard to detect way has been raised is a real benefit to the user. The fact that mitm of banking apps is very difficult without protracted user interaction is a real benefit to the user. There are, conservatively, hundreds of millions of users having their lives made better by security people fighting for them every day to make their devices safer to use in a hostile world.

Do you also object to TLS? What about centrally generated electricity?