#!/bin/bash
#
# seafile-server-installer/startssl-certificate-generator
#
# Copyright 2015, Alexander Jackson <alexander.jackson@seafile.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
#set -x
# -------------------------------------------
# Vars
# -------------------------------------------
CLASS_DEFAULT=1
RSA=4096


# -------------------------------------------
# About
# -------------------------------------------
cat << EOF

  StartSSL certificate creator for NGINX

  Go to https://www.startssl.com and sign up. Decide
  if the free class1 certs are good enough or if you
  need paid class2 or class3 certificates. Class1
  certificates are the default after signing up. You
  don't need to do anything else to issue class1 certs.

  For questions or suggestions please contact me at
  alexander.jackson@seafile.de

  -----------------------------------------------------------------
  Hit return to proceed or CTRL-C to abort.

EOF

read dummy


# -------------------------------------------
# Start working
# -------------------------------------------
read -p "New certs class? [$CLASS_DEFAULT]" CLASS
CLASS="${CLASS:-$CLASS_DEFAULT}"

if [[ $CLASS > 3 ]]; then
  echo Wrong class type. Select 1, 2 or 3. Aborting.. ; exit 1
fi

read -p "New certs domain name? " DOMAIN

CERT_DIR=$(pwd)/certs/${DOMAIN}


# -------------------------------------------
# Abort if CERT_DIR exists
# -------------------------------------------
if [[ -d "${CERT_DIR}" ]] ;
then
  echo " Aborting because directory ${CERT_DIR} already exist" ; exit 1
fi

mkdir -p ${CERT_DIR}


# -------------------------------------------
# Create certificate signing request and private key in batch mode
# -------------------------------------------
openssl req -new -nodes -keyout ${CERT_DIR}/${DOMAIN}.key -out ${CERT_DIR}/${DOMAIN}.csr -newkey rsa:${RSA} -batch


# -------------------------------------------
# Print instructions
# -------------------------------------------
cat << EOF

  Follow these steps next:

  1. Go to https://www.startssl.com >
  2. Certificates Wizard >
  3. Certificate Target: (Web Server SSL/TLS Certificate) > Continue >
  4. Generate Private Key > Skip >
  5. Submit Certificate Request (CSR) (Paste your csr shown below)

EOF

cat ${CERT_DIR}/${DOMAIN}.csr



# -------------------------------------------
# Print more instructions
# -------------------------------------------
cat << EOF

  6. Continue >>
  7. Certificate Request Received > Continue >>
  8. Add Domains: (select your domain)
  9. Optionally Add Domains > Add More < (repeat until happy) > Continue >>
 10. Ready Processing Certificate > Continue >>

EOF

echo "Hit return when the certificate is displayed."
read dummy

echo "Replace content with certificate, save and exit." > ${CERT_DIR}/${DOMAIN}.crt

nano ${CERT_DIR}/${DOMAIN}.crt

echo "Creating class ${CLASS} chained certificate for NGINX"


# -------------------------------------------
# Create certificate change for usage with NGINX
# -------------------------------------------
cat ${CERT_DIR}/${DOMAIN}.crt > ${CERT_DIR}/${DOMAIN}_chained.crt

if [[ $CLASS -eq 1 ]]; then
  wget -O - https://www.startssl.com/certs/class1/sha2/pem/sub.class1.server.sha2.ca.pem >> ${CERT_DIR}/${DOMAIN}_chained.crt
fi

if [[ $CLASS -eq 2 ]]; then
  wget -O - https://www.startssl.com/certs/class2/sha2/pem/sub.class2.server.sha2.ca.pem >> ${CERT_DIR}/${DOMAIN}_chained.crt
fi

if [[ $CLASS -eq 3 ]]; then
  wget -O - https://www.startssl.com/certs/class3/sha2/pem/sub.class3.server.sha2.ca.pem >> ${CERT_DIR}/${DOMAIN}_chained.crt
fi

wget -O - https://www.startssl.com/certs/ca-sha2.pem >> ${CERT_DIR}/${DOMAIN}_chained.crt


# -------------------------------------------
# List new csr and key for informational value
# -------------------------------------------
echo "Our newly Created files:"
ls -ahl ${CERT_DIR}


# -------------------------------------------
# Print
# -------------------------------------------
cat << EOF

  Implementation example for NGINX:

  [...]
  ssl on;
  ssl_certificate ${CERT_DIR}/${DOMAIN}_chained.crt;
  ssl_certificate_key ${CERT_DIR}/${DOMAIN}.key;
  [...]

  Finished!

EOF