ckrootca

#!/bin/sh
DOMAIN=`echo $1 | sed 's/https:\/\///' | sed -E 's/\/.*$//'`
URL="https://$DOMAIN"
if [ -z $URL ]; then
  cat << EOF
Usage: ckrootca <url>

EOF
else
  curl -c $DOMAIN.cookie -I -vs $URL 2>&1 | grep "Server certificate" -B1 | tail -n1
fi

Prototype bash script to check root CA of any https url.
Basis for upcoming brew, Ruby gem or NPM package.

Improved version where the script will prefix https:// if it is missing from the argument

Updated script not to recursively follow redirects, just perform a check on the root URL
FIXME: should follow redirect if subsequent domain differs from requested