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https://github.com/nabla-c0d3/ssl-kill-switch2

Blackbox tool to disable SSL certificate validation - including certificate pinning - within iOS and macOS applications.
https://github.com/nabla-c0d3/ssl-kill-switch2

blackbox cydia ios macos reverse-engineering security ssl ssl-pinning

Last synced: 26 days ago
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Blackbox tool to disable SSL certificate validation - including certificate pinning - within iOS and macOS applications.

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README 

        
SSL Kill Switch 2

=================



Blackbox tool to disable SSL/TLS certificate validation - including certificate

pinning - within iOS and macOS applications. Second iteration of

https://github.com/iSECPartners/ios-ssl-kill-switch .



Description

-----------



Once loaded into an iOS or macOS application, SSL Kill Switch 2 will patch

low-level functions responsible for handling SSL/TLS connections in order to

override and disable the system's default certificate validation, as well as any

kind of custom certificate validation (such as certificate pinning).



It was successfully tested against various applications implementing certificate

pinning including the Apple App Store. The first version of SSL Kill Switch

was released at Black Hat Vegas 2012.



The most recent version iOS that is known to be supported is 14.2.



iOS Instructions

----------------



On iOS, SSL Kill Switch 2 can be installed as a Cydia Subtrate tweak on a

jailbroken device.



### WARNING: THIS TWEAK WILL MAKE YOUR DEVICE INSECURE



Installing SSL Kill Switch 2 allows anyone on the same network as the device to

easily perform man-in-the-middle attacks against *any* SSL or HTTPS connection.

This means that it is trivial to get access to emails, websites viewed in Safari

and any other data downloaded by any App running on the device.



### Installation



The following dependencies should be installed using Cydia:



* Debian Packager

* Cydia Substrate

* PreferenceLoader



Then, download the latest pre-compiled package available in the release tab of

the SSL Kill Switch 2's GitHub page. Copy it to the device, install it and

respring the device:



    dpkg -i .deb

    killall -HUP SpringBoard



There should be a new menu in the device's Settings where you can

enable the extension. Finally, kill and restart the App you want to test.



The tweak can later be uninstalled using:



    dpkg -r com.nablac0d3.SSLKillSwitch2



### Intercepting the App Store's traffic



Lots of people have asked about how to intercept the App Store's traffic using

SSL Kill Switch 2. I wrote down some instructions here but there are now outdated:

http://nabla-c0d3.github.io/blog/2013/08/20/intercepting-the-app-stores-traffic-on-ios/



### Intercepting with Charles Proxy



By default, SSL Kill Switch will disrupt the Charles Proxy iOS app and you will not be

able to proxy any network traffic with it. To fix this, add the Charles Proxy app

(com.xk72.Charles) to the list of excluded bundle IDs in the SSL Kill Switch config:



![Charles proxy](charles.png)



### Build



The build requires the Theos suite to be installed available at

http://www.iphonedevwiki.net/index.php/Theos/Getting_Started .



Then, within SSL Kill Switch 2's root foler, create a symlink to your theos

installation:



    ln -s / theos



Make sure dpkg is installed. If you have Homebrew, use:



    brew install dpkg



Then, the SSL Kill Switch 2 Debian package can be built using:



    make package



macOS Instructions

-----------------



SSL Kill Switch 2 can be used in macOS applications as a dynamic library to be injected into

processes.



### WARNING: THIS HAS NOT BEEN TESTED ON RECENT VERSIONS OF MACOS



### Usage



On macOS, the SSLKillSwitch library needs to be manually injected into the process where

SSL pinning needs to be disabled. Once injected, it will automatically override and disable

SSL validation.



There are several ways to do this including:



* Starting the process with LLDB or in Xcode Debug->Attach to process then pause, and load SSLKillSwitch using `dlopen()`:



        (lldb) expr (void*)dlopen("/path/to/build/SSLKillSwitch.framework/Versions/A/SSLKillSwitch", 1)



  Expected result is a non-zero pointer:



        (void *) $1 = 0x00007f92e74d10c0



  If you receive a zero pointer then you may need to enable code-signing and build for profiling then use the binary in the release folder, and even may have to copy the binary to the app's resources folder. In which case you would have seen a sandbox read violation output to console. To test a new version of the binary you need to kill the app and load it in again.



* Using DYLD\_INSERT\_LIBRARIES to inject SSLKillSwitch and start the process.



### Restricted Apps



TBD



### Build



Use the Xcode project to build SSL Kill Switch 2 for macOS. The compiled library will then be

available in _Products/SSLKillSwitch.framework/Versions/A/SSLKillSwitch_. This is the binary

that you need to inject in the process where you want to disable SSL pinning.



Changelog

---------



* v0.14: Added support for iOS 13.

* v0.13: Added support for iOS 12.

* v0.12: Added support for iOS 11.

* v0.11: Added support for iOS 10.

* v0.10: Added support for proxy-ing [CocoaSPDY](https://github.com/twitter/CocoaSPDY) Apps (ie. Twitter iOS).

* v0.9: Extended the MobileLoader filter to simplify the proxy-ing of the Apple App Store application.

* V0.8: Added support for iOS 9.

* v0.7: Renamed tool to SSL Kill Switch 2; added support for macOS applications and TrustKit.

* v0.6: Added support for iOS 7.

* v0.5: Complete rewrite in order to add support for proxy-ing Apple's App Store application.

* v0.4: Added hooks for SecTrustEvaluate().

* v0.3: Bug fixes and support for iOS 6.

* v0.2: Initial release.



License

-------



MIT - See ./LICENSE.



Author

------



Alban Diquet - @nabla_c0d3