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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=$1
ACME=/usr/lib/acme/acme.sh
export CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
export NO_TIMESTAMP=1
UHTTPD_LISTEN_HTTP=
STATE_DIR='/etc/acme'
ACCOUNT_EMAIL=
DEBUG=0
. /lib/functions.sh
check_cron()
{
[ -f "/etc/crontabs/root" ] && grep -q '/etc/init.d/acme' /etc/crontabs/root && return
echo "0 0 * * * /etc/init.d/acme start" >> /etc/crontabs/root
/etc/init.d/cron start
}
log()
{
logger -t acme -s -p daemon.info "$@"
}
err()
{
logger -t acme -s -p daemon.err "$@"
}
debug()
{
[ "$DEBUG" -eq "1" ] && logger -t acme -s -p daemon.debug "$@"
}
get_listeners()
{
netstat -nptl 2>/dev/null | awk 'match($4, /:80$/){split($7, parts, "/"); print parts[2];}' | uniq | tr "\n" " "
}
pre_checks()
{
main_domain="$1"
log "Running pre checks for $main_domain."
listeners="$(get_listeners)"
debug "port80 listens: $listeners"
case "$listeners" in
"uhttpd")
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
;;
"")
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
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" ]; then
uci set uhttpd.main.listen_http="$UHTTPD_LISTEN_HTTP"
uci commit uhttpd
/etc/init.d/uhttpd reload
UHTTPD_LISTEN_HTTP=
fi
}
err_out()
{
post_checks
exit 1
}
int_out()
{
post_checks
trap - INT
kill -INT $$
}
is_staging()
{
local main_domain="$1"
grep -q "acme-staging" "$STATE_DIR/$main_domain/${main_domain}.conf"
return $?
}
issue_cert()
{
local section="$1"
local acme_args=
local enabled
local use_staging
local update_uhttpd
local keylength
local domains
local main_domain
local moved_staging=0
local failed_dir
local webroot
local dns
config_get_bool enabled "$section" enabled 0
config_get_bool use_staging "$section" use_staging
config_get_bool update_uhttpd "$section" update_uhttpd
config_get domains "$section" domains
config_get keylength "$section" keylength
config_get webroot "$section" webroot
config_get dns "$section" dns
[ "$enabled" -eq "1" ] || return
[ "$DEBUG" -eq "1" ] && acme_args="$acme_args --debug"
set -- $domains
main_domain=$1
[ -n "$webroot" ] || [ -n "$dns" ] || pre_checks "$main_domain" || return 1
log "Running ACME for $main_domain"
if [ -e "$STATE_DIR/$main_domain" ]; then
if [ "$use_staging" -eq "0" ] && is_staging "$main_domain"; then
log "Found previous cert issued using staging server. Moving it out of the way."
mv "$STATE_DIR/$main_domain" "$STATE_DIR/$main_domain.staging"
moved_staging=1
else
log "Found previous cert config. Issuing renew."
$ACME --home "$STATE_DIR" --renew -d "$main_domain" $acme_args || return 1
return 0
fi
fi
acme_args="$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="$acme_args --staging"
if [ -n "$dns" ]; then
log "Using dns mode"
acme_args="$acme_args --dns $dns"
elif [ -z "$webroot" ]; then
log "Using standalone mode"
acme_args="$acme_args --standalone"
else
if [ ! -d "$webroot" ]; then
err "$main_domain: Webroot dir '$webroot' does not exist!"
return 1
fi
log "Using webroot dir: $webroot"
acme_args="$acme_args --webroot $webroot"
fi
handle_credentials() {
local credential="$1"
eval export $credential
}
config_list_foreach "$section" credentials handle_credentials
if ! $ACME --home "$STATE_DIR" --issue $acme_args; then
failed_dir="$STATE_DIR/${main_domain}.failed-$(date +%s)"
err "Issuing cert for $main_domain failed. Moving state to $failed_dir"
[ -d "$STATE_DIR/$main_domain" ] && mv "$STATE_DIR/$main_domain" "$failed_dir"
if [ "$moved_staging" -eq "1" ]; then
err "Restoring staging certificate"
mv "$STATE_DIR/${main_domain}.staging" "$STATE_DIR/${main_domain}"
fi
return 1
fi
if [ "$update_uhttpd" -eq "1" ]; then
uci set uhttpd.main.key="$STATE_DIR/${main_domain}/${main_domain}.key"
uci set uhttpd.main.cert="$STATE_DIR/${main_domain}/fullchain.cer"
# 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
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