iOS Scripts

A collection of scripts I wrote that have something to do with iOS.

Script	Description	Dependencies
jcache	Rebuild file hierarchy from a dyld_shared_cache.	jtool
launchdump	Print useful LaunchDaemon info nicely formatted	plutil, xmllint
mbdb	ls -la with original file names for a MobileBackup.	Python
mbdump	Rebuild file hierarch from a MobileBackup.	mbdb
mkdeb	Tiny & crude script to make .deb files.	ar, tar
shsh2apt	Extract an apticket.der from an SHSH plist.	plutil, xmllint, base64
unlib	Extract and rebuild dyld_shared_cache from an OTA bundle.	jcache, unzip, unxz, grep, OTAPack

Unless otherwise noted, all scripts are bash scripts and will require bash to run.

License

Unless otherwise noted at the top of a file itself, all files in this repository were written by me and are placed in the public domain.

Aliases

There are also a few things I use that are too short for their own scripts, but I find wicked useful.
I placed these in my ~/.profile, either as alias or as variable assignments.

Never type the SDK path again:

iSDK='/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk';

Compile for iOS with igcc:

alias igcc='xcrun -sdk iphoneos gcc -Wall -arch armv7 -arch arm64';

Self-sign a binary with entitlements, using isign ent.plist binary:

isign()
{
    codesign -s - --entitlements "$2" "$1";
}

Dump any ASN.1 file in DER format (e.g. every img4 file ever) with asn1dump:

alias asn1dump='openssl asn1parse -i -inform DER -in';

Convenient SSH over USB

I find it annoying to get my phone's local WLAN IP every time I connect to it, and I find it annoying to enter a password every time.
Here's how to get rid of both of these:

• Install libusbmuxd to get iproxy.
• Add the public key of your PC to /var/mobile/.ssh/authorized_keys on your phone.
• Add this entry to ~/.ssh/config on your PC:

Host iphone
    HostName 127.0.0.1
    Port 2222
    User mobile
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null

Now

• Plug in your phone over USB.
• Run iproxy 2222 22 and leave it open.
• In a new tab/window, run ssh iphone.

If done right, it won't ask for a password ever again¹.

---

¹ Except if the device was rebooted and has not yet been unlocked for the first time, because at that point /var/mobile/.ssh/authorized_keys is still encrypted and not readable.