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Script to Capture Extension Attribute Value Returns Nothing

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Hi everyone,

I have mashed together the following script to report a managed device's current LAPS password, which is stored as an extension attribute on the JSS.

Unfortunately, when I run the script, nothing is returned (no errors either).

#!/bin/bash

apiUser=""
apiPass=""
apiURL=$(/usr/bin/defaults read /Library/Preferences/com.jamfsoftware.jamf.plist jss_url | sed 's|/$||')
udid=$(/usr/sbin/system_profiler SPHardwareDataType | /usr/bin/awk '/Hardware UUID:/ { print $3 }')
extAttName=""LAPS""

LAPS_Password=$(curl -s -f -u $apiUser:$apiPass -H "Accept: application/xml" $apiURL/JSSResource/computers/udid/$udid/subset/extension_attributes | xpath "//extension_attribute[name=$extAttName]" 2>&1 | awk -F'<value>|</value>' '{print $2}')

echo $LAPS_Password

Does anyone know what may be going wrong here?

Best answer by sim_brar

Update: It turns out that the API password "apiPass" was too complex (i.e. alphanumeric) for the script (seen here also: https://www.jamf.com/jamf-nation/discussions/27059/api-authentication-doesn-t-work). Simplifying the password resolved the issue.

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4 replies

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  • sim_brar
  • Author
  • Contributor
  • 12 replies
  • Answer
  • October 2, 2019

Update: It turns out that the API password "apiPass" was too complex (i.e. alphanumeric) for the script (seen here also: https://www.jamf.com/jamf-nation/discussions/27059/api-authentication-doesn-t-work). Simplifying the password resolved the issue.

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  • djrory
  • Contributor
  • 73 replies
  • March 25, 2021

@sim.brar Did you ever come across this? I copied your script line for line and changed only the EA name and credentials to match mine. 

apiURL=$(/usr/bin/defaults read /Library/Preferences/com.jamfsoftware.jamf.plist jss_url | sed 's|/$||')
udid=$(/usr/sbin/system_profiler SPHardwareDataType | /usr/bin/awk '/Hardware UUID:/ { print $3 }')
extAttName=""UserCN""

LAPS_Password=$(curl -s -f -u $apiUser:$apiPass -H "Accept: application/xml" $apiURL/JSSResource/computers/udid/$udid/subset/extension_attributes | xpath "//extension_attribute[name=$extAttName]" 2>&1 | awk -F'<value>|</value>' '{print $2}')

echo UserCN: $LAPS_Password


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  • marc_beuvin
  • New Contributor
  • 4 replies
  • March 26, 2021

Hi djrory,

I was encountering the same issue on a script running fine from a while.

The issue is coming from Big Sur : Dealing with xpath changes in Big Sur

Hope this helps...

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1 person likes this
  • D
    davisna
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  • sim_brar
  • Author
  • Contributor
  • 12 replies
  • March 27, 2021

@djrory @marc.beuvin yup, please see the same script, updated for Big Sur:

#!/bin/bash

apiUser=""
apiPass=""
apiURL=$(/usr/bin/defaults read /Library/Preferences/com.jamfsoftware.jamf.plist jss_url | sed 's|/$||')
udid=$(/usr/sbin/system_profiler SPHardwareDataType | /usr/bin/awk '/Hardware UUID:/ { print $3 }')
extAttName=""LAPS""

LAPS_Password=$(curl -s -f -u $apiUser:$apiPass -H "Accept: application/xml" $apiURL/JSSResource/computers/udid/$udid/subset/extension_attributes | xpath -e "//extension_attribute[name=$extAttName]" 2>&1 | awk -F'<value>|</value>' '{print $2}' | tail -n +1)

echo $LAPS_Password
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  • D
    davisna

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