I have two C binaries which tries to open network connection for communication.
This is for external communication. When i run that for the first time, OS X\' firew
You can resolve this by signing the offending application binary yourself.
Disclaimer: Signing an application yourself will make an application appear more
secure to the operating system, when in reality it isn’t. Only sign applications
that you are 100% sure are not spyware or otherwise malicious. If you have any
doubts, just uninstall/reinstall.
Part 1: Create a Signing Identity
The solution I’m going for – signing the app myself – requires that I create a Signing Identity, also known as Signing Certificate. This is very easy to do:
Once completed, you will see your certificate in Keychain Access. Verify the name you picked, and you’re done with this step. Well done!
Step 2: (Re-)Sign your application
Now you have to sign your application. To do this, open up Terminal again and use the following command:
codesign -s "My Signing Identity" -f /path/to/your/binary/app
A dialog will appear, click "Allow".
Now start your application again. You will get the accept incoming connections dialog one last time. Click "Allow".
From now on you should no longer get the warnings anymore! Now it is possible to enjoy the security of your firewall being active without the inconvenience of having to click "allow" constantly.
Credit: The original source which served as a starting place for this updated and annotated solution guide was http://silvanolte.com/blog/2011/01/18/do-you-want-the-application-to-accept-incoming-network-connections/
I was trying to apply this solution to fix python as used by Arduino OTA, I found another solution describing self-signing the app that stated $(which python) as the file path to sign, but in my case that resolved to /usr/bin/python. Self-signing this not only required I drop to Rootless mode to allow writing to /usr/bin, but when I went back and tested it, python was STILL asking for permission to allow incoming connections!
The correct python file to self-sign is in fact (in my case at least) /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app
Once I self-signed this correct file path, the Arduino OTA process no longer required me clicking allow incoming connections - Hoorah!
Hope that helps someone.
In my case this alert appeared when i run Python project from PyCharm after updating MacOS to 10.15 Cataline. I fixed it with
codesign -vvv /Applications/PyCharm.app/