From 7c4b6e29b1d48847aedbc6da5316c5a30fb5ede2 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Fri, 8 Apr 2022 17:15:39 +0300
Subject: feat: add script to configure ssh on installer accept an SSH CA

Sponsored-by: author
---
 set-user-ca-pubkey | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100755 set-user-ca-pubkey

diff --git a/set-user-ca-pubkey b/set-user-ca-pubkey
new file mode 100755
index 0000000..0bac587
--- /dev/null
+++ b/set-user-ca-pubkey
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -eu -o pipefail
+
+die() {
+	echo "ERROR: $*" 1>&2
+	exit 1
+}
+
+cleanup() {
+	umount "$drive" || true
+	rmdir "$mnt"
+}
+
+trap cleanup EXIT
+
+drive="$1"
+pubkey="$2"
+
+[ -e "$drive" ] || die "$drive does not exist"
+[ -e "$pubkey" ] || die "$pubkey does not exist"
+
+mnt="$(mktemp -d)"
+mount "$drive" "$mnt"
+
+include="$mnt/etc/ssh/sshd_config.d/userca.conf"
+echo "TrustedUserCAKeys /etc/ssh/user_ca_keys" >"$include"
+chown root:root "$include"
+chmod 0644 "$include"
+
+cakeys="$mnt/etc/ssh/user_ca_keys"
+install -m 0600 "$pubkey" "$cakeys"
-- 
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