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#!/bin/sh
# Wrapper for acme.sh to work on openwrt.
#
# 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.
#
# Author: Toke Høiland-Jørgensen <toke@toke.dk>
CHECK_CRON=$1
ACME=/usr/lib/acme/acme.sh
export CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
export NO_TIMESTAMP=1
UHTTPD_LISTEN_HTTP=
STATE_DIR='/etc/acme'
ACCOUNT_EMAIL=
DEBUG=0
NGINX_WEBSERVER=0
UPDATE_NGINX=0
UPDATE_UHTTPD=0
USER_CLEANUP=
. /lib/functions.sh
check_cron()
{
[ -f "/etc/crontabs/root" ] && grep -q '/etc/init.d/acme' /etc/crontabs/root && return
echo "0 0 * * * /etc/init.d/acme start" >> /etc/crontabs/root
/etc/init.d/cron start
}
log()
{
logger -t acme -s -p daemon.info -- "$@"
}
err()
{
logger -t acme -s -p daemon.err -- "$@"
}
debug()
{
[ "$DEBUG" -eq "1" ] && logger -t acme -s -p daemon.debug -- "$@"
}
get_listeners() {
local proto rq sq listen remote state program
netstat -nptl 2>/dev/null | while read proto rq sq listen remote state program; do
case "$proto#$listen#$program" in
tcp#*:80#[0-9]*/*) echo -n "${program%% *} " ;;
esac
done
}
run_acme()
{
debug "Running acme.sh as '$ACME $@'"
$ACME "$@"
}
pre_checks()
{
main_domain="$1"
log "Running pre checks for $main_domain."
listeners="$(get_listeners)"
debug "port80 listens: $listeners"
for listener in $(get_listeners); do
pid="${listener%/*}"
cmd="$(basename $(readlink /proc/$pid/exe))"
case "$cmd" in
uhttpd)
if [ -n "$UHTTPD_LISTEN_HTTP" ]; then
debug "Already handled uhttpd; skipping"
continue
fi
debug "Found uhttpd listening on port 80; trying to disable."
UHTTPD_LISTEN_HTTP=$(uci get uhttpd.main.listen_http)
if [ -z "$UHTTPD_LISTEN_HTTP" ]; then
err "$main_domain: Unable to find uhttpd listen config."
err "Manually disable uhttpd or set webroot to continue."
return 1
fi
uci set uhttpd.main.listen_http=''
uci commit uhttpd || return 1
if ! /etc/init.d/uhttpd reload ; then
uci set uhttpd.main.listen_http="$UHTTPD_LISTEN_HTTP"
uci commit uhttpd
return 1
fi
;;
nginx)
if [ "$NGINX_WEBSERVER" -eq "1" ]; then
debug "Already handled nginx; skipping"
continue
fi
debug "Found nginx listening on port 80; trying to disable."
NGINX_WEBSERVER=1
local tries=0
while grep -sq "$cmd" "/proc/$pid/cmdline" && kill -0 "$pid"; do
/etc/init.d/nginx stop
if [ $tries -gt 10 ]; then
debug "Can't stop nginx. Terminating script."
return 1
fi
debug "Waiting for nginx to stop..."
tries=$((tries + 1))
sleep 1
done
;;
"")
debug "Nothing listening on port 80."
;;
*)
err "$main_domain: Cannot run in standalone mode; another daemon is listening on port 80."
err "Disable other daemon or set webroot to continue."
return 1
;;
esac
done
iptables -I input_rule -p tcp --dport 80 -j ACCEPT -m comment --comment "ACME" || return 1
ip6tables -I input_rule -p tcp --dport 80 -j ACCEPT -m comment --comment "ACME" || return 1
debug "v4 input_rule: $(iptables -nvL input_rule)"
debug "v6 input_rule: $(ip6tables -nvL input_rule)"
return 0
}
post_checks()
{
log "Running post checks (cleanup)."
# The comment ensures we only touch our own rules. If no rules exist, that
# is fine, so hide any errors
iptables -D input_rule -p tcp --dport 80 -j ACCEPT -m comment --comment "ACME" 2>/dev/null
ip6tables -D input_rule -p tcp --dport 80 -j ACCEPT -m comment --comment "ACME" 2>/dev/null
if [ -e /etc/init.d/uhttpd ] && ( [ -n "$UHTTPD_LISTEN_HTTP" ] || [ "$UPDATE_UHTTPD" -eq 1 ] ); then
if [ -n "$UHTTPD_LISTEN_HTTP" ]; then
uci set uhttpd.main.listen_http="$UHTTPD_LISTEN_HTTP"
UHTTPD_LISTEN_HTTP=
fi
uci commit uhttpd
/etc/init.d/uhttpd reload
fi
if [ -e /etc/init.d/nginx ] && ( [ "$NGINX_WEBSERVER" -eq 1 ] || [ "$UPDATE_NGINX" -eq 1 ] ); then
NGINX_WEBSERVER=0
/etc/init.d/nginx restart
fi
if [ -n "$USER_CLEANUP" ] && [ -f "$USER_CLEANUP" ]; then
log "Running user-provided cleanup script from $USER_CLEANUP."
"$USER_CLEANUP" || return 1
fi
}
err_out()
{
post_checks
exit 1
}
int_out()
{
post_checks
trap - INT
kill -INT $$
}
is_staging()
{
local main_domain
local domain_dir
main_domain="$1"
domain_dir="$2"
grep -q "acme-staging" "${domain_dir}/${main_domain}.conf"
return $?
}
issue_cert()
{
local section="$1"
local acme_args=
local enabled
local use_staging
local update_uhttpd
local update_nginx
local keylength
local keylength_ecc=0
local domains
local main_domain
local moved_staging=0
local failed_dir
local webroot
local dns
local user_setup
local user_cleanup
local ret
local domain_dir
local acme_server
local days
config_get_bool enabled "$section" enabled 0
config_get_bool use_staging "$section" use_staging
config_get_bool update_uhttpd "$section" update_uhttpd
config_get_bool update_nginx "$section" update_nginx
config_get calias "$section" calias
config_get dalias "$section" dalias
config_get domains "$section" domains
config_get keylength "$section" keylength
config_get webroot "$section" webroot
config_get dns "$section" dns
config_get user_setup "$section" user_setup
config_get user_cleanup "$section" user_cleanup
config_get acme_server "$section" acme_server
config_get days "$section" days
UPDATE_NGINX=$update_nginx
UPDATE_UHTTPD=$update_uhttpd
USER_CLEANUP=$user_cleanup
[ "$enabled" -eq "1" ] || return
[ "$DEBUG" -eq "1" ] && acme_args="$acme_args --debug"
set -- $domains
main_domain=$1
if [ -n "$user_setup" ] && [ -f "$user_setup" ]; then
log "Running user-provided setup script from $user_setup."
"$user_setup" "$main_domain" || return 1
else
[ -n "$webroot" ] || [ -n "$dns" ] || pre_checks "$main_domain" || return 1
fi
if echo $keylength | grep -q "^ec-"; then
domain_dir="$STATE_DIR/${main_domain}_ecc"
keylength_ecc=1
else
domain_dir="$STATE_DIR/${main_domain}"
fi
log "Running ACME for $main_domain"
handle_credentials() {
local credential="$1"
eval export $credential
}
config_list_foreach "$section" credentials handle_credentials
if [ -e "$domain_dir" ]; then
if [ "$use_staging" -eq "0" ] && is_staging "$main_domain" "$domain_dir"; then
log "Found previous cert issued using staging server. Moving it out of the way."
mv "$domain_dir" "${domain_dir}.staging"
moved_staging=1
else
log "Found previous cert config. Issuing renew."
[ "$keylength_ecc" -eq "1" ] && acme_args="$acme_args --ecc"
run_acme --home "$STATE_DIR" --renew -d "$main_domain" $acme_args && ret=0 || ret=1
post_checks
return $ret
fi
fi
acme_args="$acme_args $(for d in $domains; do echo -n "-d $d "; done)"
acme_args="$acme_args --keylength $keylength"
[ -n "$ACCOUNT_EMAIL" ] && acme_args="$acme_args --accountemail $ACCOUNT_EMAIL"
[ "$use_staging" -eq "1" ] && acme_args="$acme_args --staging"
if [ -n "$acme_server" ]; then
log "Using custom ACME server URL"
acme_args="$acme_args --server $acme_server"
fi
if [ -n "$days" ]; then
log "Renewing after $days days"
acme_args="$acme_args --days $days"
fi
if [ -n "$dns" ]; then
log "Using dns mode"
acme_args="$acme_args --dns $dns"
if [ -n "$dalias" ]; then
log "Using domain alias for dns mode"
acme_args="$acme_args --domain-alias $dalias"
if [ -n "$calias" ]; then
err "Both domain and challenge aliases are defined. Ignoring the challenge alias."
fi
elif [ -n "$calias" ]; then
log "Using challenge alias for dns mode"
acme_args="$acme_args --challenge-alias $calias"
fi
elif [ -z "$webroot" ]; then
log "Using standalone mode"
acme_args="$acme_args --standalone --listen-v6"
else
if [ ! -d "$webroot" ]; then
err "$main_domain: Webroot dir '$webroot' does not exist!"
post_checks
return 1
fi
log "Using webroot dir: $webroot"
acme_args="$acme_args --webroot $webroot"
fi
if ! run_acme --home "$STATE_DIR" --issue $acme_args; then
failed_dir="${domain_dir}.failed-$(date +%s)"
err "Issuing cert for $main_domain failed. Moving state to $failed_dir"
[ -d "$domain_dir" ] && mv "$domain_dir" "$failed_dir"
if [ "$moved_staging" -eq "1" ]; then
err "Restoring staging certificate"
mv "${domain_dir}.staging" "${domain_dir}"
fi
post_checks
return 1
fi
if [ -e /etc/init.d/uhttpd ] && [ "$update_uhttpd" -eq "1" ]; then
uci set uhttpd.main.key="${domain_dir}/${main_domain}.key"
uci set uhttpd.main.cert="${domain_dir}/fullchain.cer"
# commit and reload is in post_checks
fi
local nginx_updated
nginx_updated=0
if command -v nginx-util 2>/dev/null && [ "$update_nginx" -eq "1" ]; then
nginx_updated=1
for domain in $domains; do
nginx-util add_ssl "${domain}" acme "${domain_dir}/fullchain.cer" \
"${domain_dir}/${main_domain}.key" || nginx_updated=0
done
# reload is in post_checks
fi
if [ "$nginx_updated" -eq "0" ] && [ -w /etc/nginx/nginx.conf ] && [ "$update_nginx" -eq "1" ]; then
sed -i "s#ssl_certificate\ .*#ssl_certificate ${domain_dir}/fullchain.cer;#g" /etc/nginx/nginx.conf
sed -i "s#ssl_certificate_key\ .*#ssl_certificate_key ${domain_dir}/${main_domain}.key;#g" /etc/nginx/nginx.conf
# commit and reload is in post_checks
fi
post_checks
}
load_vars()
{
local section="$1"
STATE_DIR=$(config_get "$section" state_dir)
ACCOUNT_EMAIL=$(config_get "$section" account_email)
DEBUG=$(config_get "$section" debug)
}
check_cron
[ -n "$CHECK_CRON" ] && exit 0
[ -e "/var/run/acme_boot" ] && rm -f "/var/run/acme_boot" && exit 0
config_load acme
config_foreach load_vars acme
if [ -z "$STATE_DIR" ] || [ -z "$ACCOUNT_EMAIL" ]; then
err "state_dir and account_email must be set"
exit 1
fi
[ -d "$STATE_DIR" ] || mkdir -p "$STATE_DIR"
trap err_out HUP TERM
trap int_out INT
config_foreach issue_cert cert
exit 0