OSX 10.9 script to allow confirmation of ssh keys on each use (/usr/libexec/ssh-askpass)

ssh-askpass

#!/bin/bash
#
# An SSH_ASKPASS command for MacOS X
#
# Author: petiepooo
# License: CC_SA
#
# This script is called by ssh-agent when SSH_ASKPASS environment
#  variable is set.  It allows use of confirm each use when adding
# an ssh key (ssh-add -c <key>).
#

# if the first argument is '-s', output shell commands for eval
if [ "$1" == "-s" ]; then
    echo "SSH_ASKPASS=/usr/libexec/ssh-askpass"
    echo "export SSH_ASKPASS"
    exit 0
fi

# find the frontmost application at time of execution
FRAPP=`osascript -e 'tell application "System Events"'\
   -e  'set result to name of first application process\
        whose frontmost is true' -e 'end tell'`

# build the dialog command
DIALOG="display dialog \"$@\" default answer \"\"\
        with hidden answer with icon caution\
        with title \"${SSH_ASKPASS_TITLE:-"SSH"}\""

if [ "$FRAPP" != "Terminal" ]; then
  say "s s h authentication request" &
fi

result=`osascript -e 'tell application "Terminal"'\
    -e "$DIALOG" -e 'text returned of result' -e 'end tell' 2>/dev/null`
return=$?

# return the text entered in the password entry field as stdout
test -z "$result" && exit $return

# else return the password entered on stdout
exec echo "$result" | sed -e 's/^text returned://' -e 's/, button.*$//'