ssl.sh

#!/bin/bash

# fetch and decode SSL cert from a remote host

url=$1; shift

if [ -z "${url}" ]; then
  echo "Usage: ${0} <url>"
fi

proto=$(echo ${url} | awk -F '[:/]' '{print $1}')
host=$(echo ${url} | awk -F '[:/]' '{print $4}')

if [[ -z "${proto}" || -z "${host}" ]]; then
  echo "Unable to parse url. Must by in format 'http(s)://domain/'"
fi

if [ "${proto}" == "http" ]; then
  port="80"
else
  port="443"
fi

echo | openssl s_client -servername ${host} -connect ${host}:${port} 2>/dev/null | openssl x509 -noout -text