jtool is another option starting from iOS 8.decache by phoenixdev to nearly perfectly extract dylibs from iOS DySlim by comex to mount the whole cache file on Mac OS X.dyld_decache by KennyTM~ to extract these dylibs.Do note this is the exact same output provided by XCode automatically. This tool produces nearly perfect output on current iOS versions. Python project capable of extracting and heavily fixing up frameworks from the shared cache. There are known issues with loading a shared cache. Ghidra is capable of loading the shared cache It also allows loading the entire shared cache, but tends to crash when loading it. It does not fix references and as such produces mostly useless output. Hopper is capable of loading singular modules from the shared cache. If you own a copy, check the IDA page on this wiki for a guide on using it. It entirely eliminates the need for extraction or third-party scripts to fix output.ĭetails and instructions on using the integrated tools can be found on the IDA Pro page. IDA 7.5 includes a plethora of tools that make working with the dsc much more tolerable. The only tool capable of extracting on its own is IDA Pro 7.5, and using an extractor can still be easier. Using DyldExtractor is recommended for extraction. They're located under /Applications/Xcode.app/Contents/Developer/Platforms/atform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot (Xcode 11 and higher) or /Applications/Xcode.app/Contents/Developer/Platforms/atform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot (Xcode 10 and lower). For most shared_cache analysis, unless you own IDA 7.5 or the frameworks you are looking for are not available in simulators, you are fine with these. The simulator runtime generated by Xcode includes fully symbolicated, perfect 圆4 binaries for Private and Public frameworks. Shared cache static analysis Simulator Runtime FrameworksĬan someone with an M1 mac comment on this? However, these cannot yet be loaded by dyld, as more work needs done. Reverse engineering the code in private or public frameworks within iOS.ĭyldExtractor is currently (as of iOS 14) capable of extracting nearly perfect frameworks from the shared cache.Using class-dump or similar tools to analyze Private Frameworks.Linking against a framework or library not available in the public SDK.The only way to obtain the libraries running on your device is via extraction.Įxtracting the shared cache is useful in a few situations: Since iOS 8, the SDK no longer includes extracted frameworks. Previously, it was located at /usr/lib/dyld Extracting Frameworks and Libraries. On newer machines, it is located at /System/Library/dyld/ Copy the dyld_shared_cache to your machine.Mount the dmg and navigate to /System/Library/Caches//.ipsw file for the target version and device Run ipsw download ipsw -version -device [target device model (e.g.Obtaining a shared cache For an iOS Device Using the ipsw tool The cache is only vaguely documented in dyld man pages. Starting with macOS 11, update_dyld_shared_cache is deprecated and, as in iOS, the only copy of the libraries is in the "cache". Unlike iOS, macOS before 11 Big Sur used to ship with the source binaries still on-disk, particularly so it can be updated with update_dyld_shared_cache. OS X, along with any other *OS released by apple also uses a shared cache. The binaries you see in /Applications or /private/var/staged_system_apps are now just shims, so if you attempt to class-dump them it will error out as no ObjC section will be found. If you're looking for binaries or libraries inside of /System/Library/Frameworks or /System/Library/PrivateFrameworks (or other directories) and can't, this is why.Īs of iOS 13.5 application code is now in frameworks in the shared cache. The original files are redundant and thus eliminated from the system. Since iPhone OS 3.1, all system (private and public) libraries have been combined into a big cache file to improve performance.
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