If a prospective customer downloads your software onto Mac OS X 10.8 and it hasn’t been signed, they will see a scary warning:
Not good. To run unsigned software they need to go into Mac OS X Preferences>Security & Privacy>General and change Allow applications downloaded from Mac App store and identified developers to Anywhere:
Or they need to right/Ctrl click and see another scary warning. Double plus not good. This is the new Mac Gatekeeper system in action. Apple being Apple, Gatekeeper defaults to only allowing users to run software they have downloaded off the Internet if it has been signed. This could have a big effect on your conversion rate on Mac. So if you are shipping software for the Mac, you really need to sign it.
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Apple fanboys will tell this is a sensible way for Apple to control software quality. Mac hotkeys cheat sheet. A valid certificate shows that your software hasn’t been tampered with and, if it turns out to be malware, Apple can revoke your certificate. The more cynical might see it as a way for Apple to exert even greater control over Mac developers than it already does, while simultaneously extorting $99 per year from each and every one of them. Make your own mind up on that one.
I have now managed to sign my table planner software, ready for its next release. I should have done it months ago. But I expected the process to be so tedious that it has taken me this long to get around to it. And it was every bit as mind-numbingly tedious as I expected trying to find a few useful nuggets amongst the acres of Apple documentation. I found some useful stuff in blogs, but it was quite fragmented. So I have thrown together these notes in the hope that it saves someone else a few hours going round in circles. Note that I am not currently submitting my software to the Mac App Store, so I don’t cover that here. Also my software is developed in C++/Qt using Qt Creator, rather than Objective-C/Cocoa using XCode, and my approach reflects that.
1. Sign up for Apple Developer Connection ($99 per year). Doesn’t matter if you already paid through the nose for a Windows authenticode certificate. Gatekeeper only accepts Apple certificates, so you have no choice. On the plus side, you do get other benefits, including downloading new OS upgrades for free.
2. You need Mac OS X 10.8 so you can test that your signing works. If you have an Apple Developer Connection subscription, you can download 10.8 for free (get a code from the ADC downloads area and using it in the Mac App Store). I found the upgrade from 10.6 to 10.8 was surprisingly painless (Microsoft eat your heart out).
3. Request your Apple certificates and install them into your Keychain. You can do this from Xcode (instructions here). You may need to upgrade Xcode to a recent version.
4. Use the codesign command line tool to sign:
I believe you can do this as part of your Xcode build. But I prefer a shell script. For example:
echo --sign frameworks --
echo --sign plugins--
echo --sign app--
I do this in a build shell script that automates the whole process of creating a .dmg for download. I’m not sure if the order you sign the components in is important.
Note that:
5. Verify the signing of the .app file. For example:
codesign -vvv -d <yourApp>.app
Log Out Of App Store
6. Package your .app into a .dmg, .zip, .pkg or whatever other format you use to install it (I believe .pkg files might require additional signing with a different certificate).
7. Make sure your Mac OS X 10.8 machine is set to the default Gatekeeper setting.
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8. Download your software onto Mac OS X 10.8 and check if the scary warning has gone away.
9. Pray that Apple doesn’t decide to revoke your certificate at some point for an infraction, real or imagined.
Until you have released a signed version you can put up a warning with some simple Javascript, for example:
Further reading:
Qt related:
App Store Sign Up
Java related:
Thanks to Jonathan of DeepTrawl and Stephane of LandlordMax for some useful pointers.
************** Update **************
How To Sign Out Of App Store On Mac Catalina
Things have changed again for Mac OS X 10.9/10.10. See this post for an update.
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