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Security exceptions while accessing USB HID devices from AudioServer Plugins

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Security exceptions while accessing USB HID devices from AudioServer Plugins

Subject: Security exceptions while accessing USB HID devices from AudioServer Plugins
From: srivatsav Venkatesan <email@hidden>
Date: Sun, 11 May 2014 22:38:48 -0700

Hi All,

I'm writing an audio server plugin for Mac OS 10.9 to get the audio data and covert them to some USB reports and send it to a USB HID device. I'm successful in 2 of the 3 objectives( getting data and converting to reports). When I try to send the data to the device, I get these errors

Sandbox: coreaudiod(8495) deny mach-lookup com.apple.coreservices.launchservicesd

Sandbox: coreaudiod(8495) deny iokit-open IOHIDLibUserClient

Initial research suggests that plugins are sandboxed and do not get access to communicate with hardware or other processes unless they are specifically set but doesn't tell you how to set them.

I made some progress and hit more roadblocks

Things I did:

-->Added an entry AudioServerPlugIn_MachServices in info.plist file and configured it as an array and added com.apple.coreservices.launchservicesd as the element of the array

-->Added an entry AudioServerPlugIn_IOKitUserClients in info.plist and configured as an array and added IOHIDLibUserClient as the element.

After doing the above two changes, I do not get any errors in the logs but I get kIOReturnNotPrivileged return values while calling

IOHIDManagerOpen

To correct the above issue I tried to do the following

-->Create a Device.entitlements and added com.apple.security.device.usb

and set it as boolean with value true

-->Enabled Codesigning and pointed it to the Device.entitlements file

-->Ran the build again but I get the same error value.

My Questions:

-->Am I doing the steps correctly?

-->Is there a way to get the list of IOKitUserClients

-->What IOKitUserClients list needs to be included to communicate with a USBHID device?

Any help will be highly highly appreciated

Best Regards

Srivatsav

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