for smtp auth telnet check easy tool

smtp-auth-pass.sh

#!/bin/bash

set -e


_plain() {

  local user=$1
  local pass=$2
  echo -ne "$user\0$user\0$pass" | openssl enc -base64 | tr -d '\n'; echo
}

_cram_md5() {

  local user=$1
  local pass=$2
  local challenge=$3
  decoded=$(echo $challenge | openssl enc -base64 -d)
  hmac=$(echo -n $decoded | openssl md5 -hmac $pass | cut -d' ' -f2)
  echo -n "$user $hmac" | openssl enc -base64 | tr -d '\n'; echo
}

usage() {
  echo "Usage: $(basename $0) command \$user \$pass [\$challenge]" >&2
  echo "command: [plain|cram_md5]"
  exit 1
}


if [ $# -lt 3 ]; then
  usage
fi
command=$1
shift

eval "_${command} $@"