Amfid Lazy Binding Exploit

By creating a dylib without code, just redefining the signed code verification function with a "return ok" method from another signed library and using lazy binding, the entire code signing requirement gets circumvented. This method has been used by developers for a long time now.

In evasi0n, the amfi.dylib redefines these functions:
 * _kMISValidationOptionValidateSignatureOnly (_kCFUserNotificationTokenKey from CoreFoundation)
 * _kMISValidationOptionExpectedHash (_kCFUserNotificationTimeoutKey from CoreFoundation)
 * _MISValidateSignature (_CFEqual from CoreFoundation)

TODO: some more detailed description missing here.

Usage

 * evasi0n jailbreak

Credit

 * KennyTM~
 * maybe others too