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tty_kinit () {
  # Provides a retry loop for kinit to handle mistyped passwords.

  local upn="$1" # Service principal name with which to kinit, e.g., 'name' or
    # 'name@REALM'.

  local args='-r7d'
  [[ -n $upn ]] && args+=" $upn"
  until kinit $args; do
    local keypress=
    read -rsn 1 -p $'Press c to cancel. Any other key to try again.\n' \
      keypress
    [[ $keypress != c ]] || return 1 
  done
}