#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Performs certificate pinning (HPKP) on a given domain name

# License
# =======
#
# Copyright (C) 2015-2016 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

PROJECT_NAME='freedombone'

export TEXTDOMAIN=${PROJECT_NAME}-pin-cert
export TEXTDOMAINDIR="/usr/share/locale"

DOMAIN_NAME=$1
KEY_FILENAME=/etc/ssl/private/${DOMAIN_NAME}.key
SITE_FILENAME=/etc/nginx/sites-available/${DOMAIN_NAME}

if [ ! -f "$KEY_FILENAME" ]; then
    echo $"No certificate found for $DOMAIN_NAME"
    exit 1
fi

if [ ! -f "$SITE_FILENAME" ]; then
    exit 0
fi

KEY_HASH=$(openssl rsa -in $KEY_FILENAME -outform der -pubout | openssl dgst -sha256 -binary | openssl enc -base64)

PIN_HEADER="add_header Public-Key-Pins 'pin-sha256=\"${KEY_HASH}\"; max-age=5184000; includeSubDomains';"
if ! grep -q "add_header Public-Key-Pins" $SITE_FILENAME; then
    sed -i "/ssl_ciphers.*/a     $PIN_HEADER" $SITE_FILENAME
else
    sed -i "s/add_header Public-Key-Pins.*/$PIN_HEADER/g" $SITE_FILENAME
fi

systemctl restart nginx

if ! grep -q "add_header Public-Key-Pins" $SITE_FILENAME; then
    echo $'Pinning failed'
fi

echo "Pinned $DOMAIN_NAME with hash $KEY_HASH"

exit 0