Jamf API Scripts on Github

I’ve been maintaining a Github with useful Jamf Pro scripts I’ve found helpful, and some I featured in a presentation at the 2019 Penn State MacAdmins Conference.

I specifically featured a few scripts that I use in our DEP provisioning workflow. This workflow relies heavily on using the Inventory Preload feature in Jamf Pro. It allows me to assign a machine to a user, assign it an asset tag, and put it in a department and building. The first time a machine checks in, Jamf will assign these items to the computer’s record in Jamf. These are all ways I can sort computers in Jamf Pro, but I can communicate with the Jamf API to pull some of these items and use them while preparing a new system.

For security purposes I have the username and password sent as a variable to the script. I also made the account with limited permissions to only make the call to pull computer data to mitigate concerns.

APIaddAdmin.sh is a simple script that grabs the user assigned in Jamf Pro and adds that user as an administrator. It first gets the serial number, and uses that to perform a lookup to find the assigned user via API call. It then uses a dscl command to set that user as an admin. This script would primarily be useful if you have machines prepped in advance by IT instead of initial configuration by a user.

username=$(/usr/bin/curl -H "Accept: text/xml" -sfku "${apiUser}:${apiPass}" "${jssHost}/JSSResource/computers/serialnumber/${serialNumber}/subset/location" | xmllint --format - 2>/dev/null | awk -F'>|<' '/<username>/{print $3}')
dscl . -append /Groups/admin GroupMembership $username

APIfirmware.sh could easily be customized, but this allows for a unique firmware password to be set per machine, utilizing the Asset Tag field in this case. As the firmwarepasswd command is interactive it uses the expect shell to respond. Again we get the serial number and use that to pull the asset tag from the computer’s inventory record. We use the expect shell to interact with a command line and send a unique password with a password scheme, assuming one isn’t already set. There are potential security concerns with setting a firmware password with a script. It will run in plain text and be cached to the Jamf Waiting Room, but in the case of IT preparing machines it is unlikely that any information would still be cached when the user gets the system.

doesexist=`firmwarepasswd -check`
barcode=$(/usr/bin/curl -H "Accept: text/xml" -sfku "${apiUser}:${apiPass}" "${jssHost}/JSSResource/computers/serialnumber/${serialNumber}/subset/general" | xmllint --format - 2>/dev/null | awk -F'>|<' '/<asset_tag>/{print $3}')
firmware=passwordscheme${barcode}

if [ "$doesexist" = "Password Enabled: No" ]; then
	/usr/bin/expect <<- DONE
		spawn firmwarepasswd -setpasswd
		expect "Enter new password:"
		send "$firmware\r";
		expect "Re-enter new password:"
		send "$firmware\r";
		expect EOF
	DONE
else
	echo "Firmware Password Already Exists"
fi

APIrename.sh similarly pulls the Asset Tag from the computer’s record in Jamf, again by using the serial number to perform a lookup. This sets each of the names to the same name. In this case we use the asset tag proceeded by the type of device , Mac-##### in the script. This can be coupled with a Jamf policy to keep computer name if you want to ensure you can find a machine on the network.

barcode=$(/usr/bin/curl -H "Accept: text/xml" -sfku "${apiUser}:${apiPass}" "${jssHost}/JSSResource/computers/serialnumber/${serialNumber}/subset/general" | xmllint --format - 2>/dev/null | awk -F'>|<' '/<asset_tag>/{print $3}')
hostname=Mac-$barcode
scutil --set ComputerName $hostname
scutil --set HostName $hostname
scutil --set LocalHostName $hostname

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