mailinabox/setup/ssl.sh

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#!/bin/bash
#
# SSL Certificate
# ---------------
# Create a self-signed SSL certificate if one has not yet been created.
#
# The certificate is for PRIMARY_HOSTNAME specifically and is used for:
#
# * IMAP
# * SMTP submission (port 587) and opportunistic TLS (when on the receiving end)
# * the DNSSEC DANE TLSA record for SMTP
# * HTTPS (for PRIMARY_HOSTNAME only)
#
# When other domains besides PRIMARY_HOSTNAME are served over HTTPS,
# we generate a domain-specific self-signed certificate in the management
# daemon (web_update.py) as needed.
source setup/functions.sh # load our functions
source /etc/mailinabox.conf # load global vars
apt_install openssl
mkdir -p $STORAGE_ROOT/ssl
# Generate a new private key.
# Set the umask so the key file is not world-readable.
if [ ! -f $STORAGE_ROOT/ssl/ssl_private_key.pem ]; then
(umask 077; hide_output \
openssl genrsa -out $STORAGE_ROOT/ssl/ssl_private_key.pem 2048)
fi
# Generate a certificate signing request.
if [ ! -f $STORAGE_ROOT/ssl/ssl_cert_sign_req.csr ]; then
hide_output \
openssl req -new -key $STORAGE_ROOT/ssl/ssl_private_key.pem -out $STORAGE_ROOT/ssl/ssl_cert_sign_req.csr \
-sha256 -subj "/C=$CSR_COUNTRY/ST=/L=/O=/CN=$PRIMARY_HOSTNAME"
fi
# Generate a SSL certificate by self-signing.
if [ ! -f $STORAGE_ROOT/ssl/ssl_certificate.pem ]; then
hide_output \
openssl x509 -req -days 365 \
-in $STORAGE_ROOT/ssl/ssl_cert_sign_req.csr -signkey $STORAGE_ROOT/ssl/ssl_private_key.pem -out $STORAGE_ROOT/ssl/ssl_certificate.pem
fi
# For nginx and postfix, pre-generate some Diffie-Hellman cipher bits which is
# used when a Diffie-Hellman cipher is selected during TLS negotiation. Diffie-Hellman
# provides Perfect Forward Security. openssl's default is 1024 bits, but we'll
# create 2048.
if [ ! -f $STORAGE_ROOT/ssl/dh2048.pem ]; then
openssl dhparam -out $STORAGE_ROOT/ssl/dh2048.pem 2048
fi