OSX update and Decryption

L4 Transporter

OSX update and Decryption

I've installed our Root CA cert in the "System" keychain, and have it marked as trusted.  I can successfully decrypt web traffic from a MAC running Mojave.  No problems there. 


The problem comes in when I try updating the OSX or even check for updates from the CLI.   


When I run "softwareupdate -l"  in terminal, In the logs on the firewall it appears to be coming through as web browsing app, and getting decrypted.  


I ran a packet capture, and it shows the client is resetting the connection after succesffuly going out to swscan.apple.com, which is not whitelisted for decryption exclusions.  Has anyone run into issues when trying to decrypt on OSX with a trusted root cert, while trying to update the operating system itself?


Guessing adding these domains to decryption exclusion is going to fix this?

Tags (3)
L7 Applicator

Re: OSX update and Decryption


Whitelist the following:

  • gg.apple.com
  • gnf-mdn.apple.com
  • gnf-mr.apple.com
  • gs.apple.com
  • ig.apple.com
  • mesu.apple.com
  • skl.apple.com
  • swcdn.apple.com
  • swdist.apple.com
  • swdownload.apple.com
  • swpost.apple.com
  • swscan.apple.com
  • updates-http.cdn-apple.com
  • updates.cdn-apple.com
  • xp.apple.com

That should take care of the software updates and allow your clients to actually update successfully. 

L4 Transporter

Re: OSX update and Decryption

Perfect!  As always, an excellent reply!  Thank you.  When you say whitelist- you mean exclude decryption right?

L7 Applicator

Re: OSX update and Decryption

Correct. Exclude those domains from decryption and your clients should be able to check for and download updates again. 

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