From a7d859681f5508a829115376d9dd993f3f137321 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Mon, 3 Aug 2026 10:27:49 +0300
Subject: frontends: give f3s hosts a standby.<host> SAN instead of a separate
 cert

f3s hosts don't get a distinct standby certificate/keypair; alias the
primary cert's files under the standby name (relayd selects a keypair
by SNI, so it needs matching filenames) and add standby.<host> as a
SAN on the primary cert. Every host now also gets www.<host> as a SAN
unconditionally, since public DNS publishes www for all of them.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
---
 frontends/scripts/acme.sh.tpl | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'frontends/scripts')

diff --git a/frontends/scripts/acme.sh.tpl b/frontends/scripts/acme.sh.tpl
index 3b3b35f..dd613fc 100644
--- a/frontends/scripts/acme.sh.tpl
+++ b/frontends/scripts/acme.sh.tpl
@@ -16,6 +16,15 @@ ensure_placeholder_cert () {
     fi
 }
 
+alias_cert () {
+    source=$1
+    alias=$2
+
+    ln -sf "/etc/ssl/$source.fullchain.pem" "/etc/ssl/$alias.crt"
+    ln -sf "/etc/ssl/$source.fullchain.pem" "/etc/ssl/$alias.fullchain.pem"
+    ln -sf "/etc/ssl/private/$source.key" "/etc/ssl/private/$alias.key"
+}
+
 handle_cert () {
     host=$1
     host_ip=`host $host | awk '/has address/ { print $(NF) }'`
@@ -48,7 +57,13 @@ handle_cert <%= $host %>
 if [ $? -eq 0 ]; then
     has_update=yes
 fi
-<% unless ($host eq 'blowfish.buetow.org' or $host eq 'fishfinger.buetow.org') { -%>
+<% if (grep { $_ eq $host } @$f3s_hosts) { -%>
+# f3s standby names are SANs on the primary certificate. relayd selects a
+# keypair by SNI name, so provide filename aliases for that shared certificate.
+alias_cert <%= $host %> standby.<%= $host %>
+<% } -%>
+<% unless ($host eq 'blowfish.buetow.org' or $host eq 'fishfinger.buetow.org'
+           or grep { $_ eq $host } @$f3s_hosts) { -%>
 handle_cert standby.<%= $host %>
 if [ $? -eq 0 ]; then
     has_update=yes
-- 
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