Comment 23 for bug 1713313

the question is more tricky

ettercap has the pkexec file
#!/bin/sh
pkexec --disable-internal-agent "ettercap" "$@"

but it is using a polkit file
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policyconfig PUBLIC
 "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
<policyconfig>

  <action id="@PKEXEC_INSTALL_WRAPPER@">
    <message>Authentication is required to run Ettercap</message>
    <icon_name>ettercap</icon_name>
    <defaults>
      <allow_any>auth_admin</allow_any>
      <allow_inactive>auth_admin</allow_inactive>
      <allow_active>auth_admin</allow_active>
    </defaults>
    <annotate key="org.freedesktop.policykit.exec.path">@INSTALL_BINDIR@/ettercap</annotate>
    <annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate>
  </action>

</policyconfig>

so, as upstream, I don't know what to do :(