Worklet: Enable Firewall on macOS

Originally introduced in Mac OS X Leopard (10.5.1), the built-in macOS Firewall limits incoming connections on a per-application basis (as opposed to a per-port basis). Disabled by default, this worklet enables the macOS firewall.

Evaluation:

#!/bin/bash



# helper function to check if a command exists

function command_exists {

    type "$1" &> /dev/null

}



# only evaluate if the socketfilterfw command is available

if command_exists /usr/libexec/ApplicationFirewall/socketfilterfw; then

    # check if the firewall is enabled

    /usr/libexec/ApplicationFirewall/socketfilterfw  --getglobalstate | grep -q 'enabled'



    # yes? no?

    exit $?

fi



# socketfilterfw command is not available, move along

exit 0

Remediation:

#!/bin/bash



# turn the firewall on

/usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate on



# how did we do?

exit $?