💉envject

A command-line tool for injecting environment variables or secrets to any file that has to be compiled especially in iOS.

I have written a short article regarding this.

And this is inspired by the functionality of variable-injector but written in go and not dependent with the swift toolchain version.

Demo

This can allow us to prevent hard-coding production keys inside the project. So inside the CI, this can be executed during pre-compilation. And then after that, you can then do the obfuscation to guarantee that no strings are readable.

The Problem with default Xcode's configuration (.xcconfig)

Using an xcconfig file in Xcode to store sensitive information and then accessing that information from the Info.plist file can have some potential downsides:

Security risks: Storing sensitive information in an xcconfig file can be a security risk. If you then use that information in the Info.plist file, it could be easier for an attacker to find and exploit that information.

Complexity: Accessing sensitive information through an xcconfig file and the Info.plist file can add complexity to your project, making it more difficult to manage and maintain.

Increased chance of errors: Using multiple files to manage your project's configuration settings increases the chance of errors, such as misconfigured settings or missing information.

Version control conflicts: If multiple developers are working on the project and are using different xcconfig files or Info.plist files, it can create conflicts in version control systems like Git.

Debugging: Debugging issues related to .xcconfig files and Info.plist files can be challenging, particularly if there are issues related to sensitive information.

Installation/How to use

Use from source (must have a go installed on your machine)

git clone https://github.com/michaelhenry/envject/
cd envject

go run main.go --file sample.config.txt --debug true

Download the binary file from the release assets page.

• https://github.com/michaelhenry/envject/releases

./envject --file sample.config.txt

Using Homebrew (Recommended)

brew tap michaelhenry/envject
brew install envject

envject --file sample.config.txt

To avoid brew from updating which usually taking some time:

export HOMEBREW_NO_AUTO_UPDATE=1

String obfuscation

envject is also supporting string obfuscation using the obfuscate-for flag.

For example:

On Swift project

envject --file Sources/Demo/Secrets.swift --obfuscate-for swift

LICENSE

MIT

Other reference

• Secret Management on iOS