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#!/bin/sh
#
# This script can be both used to request/obtain new certificate(s) from
# Let's Encrypt through ACME challenges:
# $ ./acme-client.sh -n -N
# to expand the domains listed in the certificate:
# $ ./acme-client.sh -e
# and be used to renew the obtained certificate(s) (default action):
# $ ./acme-client.sh
# which can be called by periodic(8).
#
# This script will be weekly executed in order to renew the certificate(s)
# by adding such configurations to "/etc/periodic.conf":
# weekly_acme_client_enable="YES"
# weekly_acme_client_renewscript="/usr/local/etc/acme/acme-client.sh"
# weekly_acme_client_deployscript="/usr/local/etc/acme/deploy.sh"
#
# Output files:
# * etc/acme/privkey.pem : account private key
# * etc/ssl/acme/private/<domain>.pem : domain private key
# * etc/ssl/acme/<domain>/fullchain.pem : domain certificate
#
# XXX/TODO:
# * How to remove/revoke a SAN from the certificate?
#
#
# Aaron LI
# 2017-04-19
#
umask 027
BASEDIR="/usr/local/etc/acme"
SSLDIR="/usr/local/etc/ssl/acme"
DOMAINSFILE="${BASEDIR}/domains.txt"
CHALLENGEDIR="/usr/local/www/acme/.well-known/acme-challenge"
# Default to show verbose information
VERBOSE="true"
# Additional arguments for "acme-client"
ARGS=""
usage() {
cat << _EOF_
usage:
`basename $0` [-h] [-efLnNv] [-d domains.txt]
-e : allow expanding the domains listed in the certificate
-f : force updating the certificate signature even if its too soon
-n : create a new 4096-bit RSA account key if one does not already exist
-N : create a new 4096-bit RSA domain key if one does not already exist
-q : be quiet (default to show verbose information)
-d domains.txt : text file with one domain and its sub-domains per line
(default: ${DOMAINSFILE})
_EOF_
}
while getopts "efhnNqd:" opt; do
case "$opt" in
h)
usage
exit 1
;;
e)
ARGS="${ARGS} -e"
;;
f)
ARGS="${ARGS} -F"
;;
n)
ARGS="${ARGS} -n"
;;
N)
ARGS="${ARGS} -N"
;;
q)
VERBOSE="false"
;;
d)
DOMAINSFILE="${OPTARG}"
;;
[?])
usage
exit 2
;;
esac
done
if [ "${VERBOSE}" = "true" ]; then
ARGS="${ARGS} -v"
fi
[ ! -d "${CHALLENGEDIR}" ] && mkdir -pv ${CHALLENGEDIR}
[ ! -d "${SSLDIR}/private" ] && mkdir -pvm700 "${SSLDIR}/private"
printf "\n=== $(date) ===\n=== CMD: $0 $* ===\n"
grep -v '^\s*#' "${DOMAINSFILE}" | while read domain line; do
printf "-------------------------------------------------------------\n"
printf "[${domain}] ${line}\n"
printf "-------------------------------------------------------------\n"
CERTSDIR="${SSLDIR}/${domain}"
[ ! -d "${CERTSDIR}" ] && mkdir -pm755 "${CERTSDIR}"
set +e # RC=2 when time to expire > 30 days
acme-client -b -C "${CHALLENGEDIR}" \
-k "${SSLDIR}/private/${domain}.pem" \
-c "${CERTSDIR}" \
${ARGS} \
${domain} ${line}
RC=$?
set -e
[ $RC -ne 0 -a $RC -ne 2 ] && exit $RC
done
printf "-------------------------------------------------------------\n"
exit 0
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