A tool and library to re-sign iOS applications, without proprietary Apple software.
For example, an iOS app in development would probably only run on the developer's iPhone.
isign
can alter the app so that it can run on another developer's iPhone.
Apple tools already exist to do this. But with isign
, now you can do this on operating
systems like Linux.
- Installing
- How to get started
- How to use isign
- isign command line arguments
- Contributing
- More documentation
- Authors
The latest version of isign
can be installed via PyPi:
$ pip install isign
On Mac OS X, there are a lot of prerequisites, so the pip
method probably won't work.
The easiest method is to use git
to clone the source code repository and
run the install script:
$ git clone https://github.com/saucelabs/isign.git $ cd isign $ sudo ./INSTALL.sh
All the libraries and tools that isign
needs to run will work on both Linux
and Mac OS X. However, you will need a Mac to export your Apple developer
credentials.
If you're like most iOS developers, credentials are confusing -- if so check out the documentation on credentials on Github.
You should have a key and certificate in Keychain Access, and a provisioning profile associated with that certificate, that you can use to sign iOS apps for one or more of your own iOS devices.
In Keychain Access, open the Certificates. Find the certificate you use to sign apps.
Right click on it and export the key as a .p12
file, let's say Certificates.p12
. If Keychain
asks you for a password to protect this file, just leave it blank.
Next, let's extract the key and certificate you need, into a standard PEM format.
$ isign_export_creds.sh ~/Certificates.p12
If you get prompted for a password, just press Return
.
By default, isign_export_creds.sh
will put these files into ~/.isign
, which is
the standard place to put isign
configuration files.
Finally, you need a provisioning profile from the Apple Developer Portal that uses the same certificate. If you've never dealt with this, the provisioning profile is what tells the phone that you Apple has okayed you installing apps onto this particular phone.
If you develop with XCode, you might have a provisioning profile already.
On the Mac where you develop with XCode, try running the isign_guess_mobileprovision.sh
script.
If you typically have only a few provisioning profiles and install on one phone, it might find it.
Anyway, once you have a .mobileprovision
file, move it to ~/.isign/isign.mobileprovision
.
The end result should look like this:
$ ls -l ~/.isign -r--r--r-- 1 alice staff 2377 Sep 4 14:17 certificate.pem -r--r--r-- 1 alice staff 9770 Nov 23 13:30 isign.mobileprovision -r-------- 1 alice staff 1846 Sep 4 14:17 key.pem
And now you're ready to start re-signing apps!
If you've installed all the files in the proper locations above, then isign
can be now invoked
on any iOS .app
directory, or .ipa
archive, or .app.zip
zipped directory. For example:
$ isign -o resigned.ipa my.ipa archived Ipa to /home/alice/resigned.ipa
You can also call it from Python:
from isign import isign
isign.resign("my.ipa", output_path="resigned.ipa")
Synopsis:
isign [-h] [-a <path to applecerts.pem>] [-c <path to your cert in .pem form>] [-k <path to your key in .pem form>] [-p <your.mobileprovision>] [-o <output path>] <path to app to resign>
-a <path>, --apple-cert <path>
Path to Apple certificate in PEM format. This is already included in the library, so you will likely never need it. In the event that the certificates need to be changed, See the Apple Certificate documentation.
-c <path>, --certificate <path>
Path to your certificate in PEM format. Defaults to $HOME/.isign/certificate.pem
.
-h, --help
Show a help message and exit.
-k <path>, --key <path>
Path to your private key in PEM format. Defaults to $HOME/.isign/key.pwm
.
-o <path>, --output <path>
Path to write the re-signed application. Defaults to out
in your current working directory.
-p <path>, --provisioning-profile <path>
Path to your provisioning profile. This should be associated with your certificate. Defaults to
$HOME/.isign/isign.mobileprovision
.
Development happens on our Github repository. File an issue, or fork the code!
You'll probably want to create some kind of python virtualenv, so you don't have to touch your system python or its libraries. virtualenvwrapper is a good tool for this.
Then, just do the following:
$ git clone https://github.com/saucelabs/isign.git $ cd isign $ dev/setup.sh $ ./run_tests.sh
If the tests don't pass please file an issue. Please keep the tests up to date as you develop.
Note: some tests require Apple's codesign to run, so they are skipped unless you run them on a Macintosh computer with developer tools.
Okay, if all the tests passed, you now have an 'editable' install of isign. Any edits to this repo will affect (for instance) how the isign command line tool works.
Sauce Labs supports ongoing public isign
development. isign
is a part of our infrastructure
for the iOS Real Device Cloud,
which allows customers to test apps and websites on real iOS devices. isign
has been successfully re-signing submitted customer apps in production
since June 2015.
This project not have an official code of conduct, yet, but one is forthcoming. Please contribute to discussion here.
See the docs directory of this repository for random stuff that didn't fit here.
Neil Kandalgaonkar is the main developer and maintainer.
Proof of concept by Steven Hazel and Neil Kandalgaonkar.
Reference scripts using Apple tools by Michael Han.