MASTG-TECH-0091: Library Injection

If you want to use Frida on non-jailbroken devices you'll need to include FridaGadget.dylib. Download it first:

curl -O https://build.frida.re/frida/ios/lib/FridaGadget.dylib

Copy FridaGadget.dylib into the app directory and use optool to add a load command to the "UnCrackable Level 1" binary.

$ unzip UnCrackable-Level1.ipa
$ cp FridaGadget.dylib Payload/UnCrackable\ Level\ 1.app/
$ optool install -c load -p "@executable_path/FridaGadget.dylib"  -t Payload/UnCrackable\ Level\ 1.app/UnCrackable\ Level\ 1
Found FAT Header
Found thin header...
Found thin header...
Inserting a LC_LOAD_DYLIB command for architecture: arm
Successfully inserted a LC_LOAD_DYLIB command for arm
Inserting a LC_LOAD_DYLIB command for architecture: arm64
Successfully inserted a LC_LOAD_DYLIB command for arm64
Writing executable to Payload/UnCrackable Level 1.app/UnCrackable Level 1...

Patching Example: Making an App Debuggable

By default, an app available on the Apple App Store is not debuggable. In order to debug an iOS application, it must have the get-task-allow entitlement enabled. This entitlement allows other processes (like a debugger) to attach to the app. Xcode is not adding the get-task-allow entitlement in a distribution provisioning profile; it is only whitelisted and added in a development provisioning profile.

Thus, to debug an iOS application obtained from the App Store, it needs to be re-signed with a development provisioning profile with the get-task-allow entitlement. How to re-sign an application is discussed in the next section.