initial commit

usr/local/sbin/certbot-ocsp

@@ -0,0 +1,62 @@
+#!/bin/sh
+# SPDX-License-Identifier: Apache-2.0
+# (c) 2024, Konstantin Demin
+
+set -ef
+
+ocsp_valid_threshold=86400
+
+usage() {
+	cat >&2 <<-EOF
+	# usage: ${0##*/} <in:issuer.pem> <in:cert.pem> <inout:ocsp.der>
+	EOF
+	exit "${1:-0}"
+}
+[ $# != 0 ] || usage
+
+arg_ok=
+while : ; do
+	[ -n "$1" ] || break
+	[ -s "$1" ] || break
+	[ -n "$2" ] || break
+	[ -s "$2" ] || break
+	[ -n "$3" ] || break
+	arg_ok=1
+break ; done
+[ -n "${arg_ok}" ] || usage 1
+unset arg_ok
+
+chain="$1"
+cert="$2"
+ocsp="$3"
+
+ossl_ocsp_read() {
+	openssl ocsp \
+	  -issuer "$1" -cert "$2" -respin "$3" -resp_text
+}
+
+ossl_ocsp_next_update() {
+	sed -En '/^\s*[Nn]ext [Uu]pdate:\s*(\S.+\S)\s*$/{s//\1/;p;q}'
+}
+
+need_update=1
+while : ; do
+	[ -s "${ocsp}" ] || break
+	ossl_ocsp_read "${chain}" "${cert}" "${ocsp}" >/dev/null || break
+
+	next_update=$(ossl_ocsp_read "${chain}" "${cert}" "${ocsp}.new" 2>/dev/null | ossl_ocsp_next_update)
+	ts_now=$(date '+%s')
+	ts_next=$(date -d "${next_update}" '+%s')
+
+	ts_diff=$((ts_next - ts_now))
+	[ ${ts_diff} -le ${ocsp_valid_threshold} ] || need_update=0
+
+	unset next_update ts_now ts_next ts_diff
+break ; done
+
+if [ ${need_update} = 0 ] ; then
+	env printf '%s: %q has valid and fresh OCSP response\n' "${0##*/}" "${cert}" >&2
+	exit 1
+fi
+
+exec openssl-ocsp "${chain}" "${cert}" "${ocsp}"