A function to ask for a password for POSIX shell

ask_password.sh

#!/bin/sh

ask_password() {
  unset -v PASSWORD

  trap 'stty echo; return 1' INT EXIT;
  stty -echo
  while [ -z "$PASSWORD" ]; do
    printf "%s (CTRL+C to abort): " "$1"
    read -r PASSWORD
    printf "\n"

    if [ -n "$PASSWORD" ]; then
      stty echo;
      return 0
    else
      echo "Empty password are not allowed. Please try again or press CTRL+C to abort."
    fi
  done
}

if ask_password "Multipass?"; then
  echo "You entered ${PASSWORD}"
else
  echo "You aborted. No password was provided." 
 fi