211 lines
7.0 KiB
Bash
211 lines
7.0 KiB
Bash
#!/hint/bash -euE
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# Copyright (C) 2023 Umorpha Systems
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# SPDX-License-Identifier: AGPL-3.0-or-later
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load_module "$(dirname -- "${BASH_SOURCE[0]}")/base-nginx.sh"
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packages+=(
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certbot
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sudo
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)
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post_install+=(10:certbot:post_install) # must be after '05:nginx:post_install'
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certbot:post_install() {
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local arg_mountpoint=$1
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########################################################################
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# First up, we're going to run a separate nginx instance from #
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# the main one to handle ACME HTTP-01 challenges. #
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########################################################################
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# Inspired by https://xyrillian.de/thoughts/posts/how-i-run-certbot.html
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cat >"$arg_mountpoint/etc/nginx/nginx-cleartext.conf" <<-'EOF'
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# -*- mode: nginx; nginx-indent-level: 4; intent-tabs-mode: nil -*-
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pid /run/nginx-cleartext.pid;
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worker_processes 1;
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error_log /var/log/nginx/error-cleartext.log error;
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events {
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worker_connections 1024;
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}
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http {
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error_log /var/log/nginx/http.error.log error;
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access_log /var/log/nginx/http.access.log combined;
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include mime.types;
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default_type application/octet-stream;
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sendfile on;
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keepalive_timeout 65;
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gzip on;
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server {
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listen 80 default_server;
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listen [::]:80 default_server;
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location / {
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return 301 https://$host$request_uri;
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}
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location /.well-known/acme-challenge {
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root /var/lib/letsencrypt;
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default_type "text/plain";
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}
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}
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}
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EOF
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mkdir -p "$arg_mountpoint/etc/systemd/system/nginx-cleartext.service.d"
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echo '[Unit]' >"$arg_mountpoint/etc/systemd/system/nginx-cleartext.service"
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ln -sT /usr/lib/systemd/system/nginx.service "$arg_mountpoint/etc/systemd/system/nginx-cleartext.service.d/00-base.conf"
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cat >"$arg_mountpoint/etc/systemd/system/nginx-cleartext.service.d/01-base.conf" <<-EOF
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[Service]
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PIDFile=/run/nginx-cleartext.pid
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ExecStart=
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ExecStart=/usr/bin/nginx -c /etc/nginx/nginx-cleartext.conf
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ExecReload=
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ExecReload=/usr/bin/nginx -c /etc/nginx/nginx-cleartext.conf -s reload
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EOF
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systemctl --root="$arg_mountpoint" enable nginx-cleartext.service
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########################################################################
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# Set up Certbot+SSL for the system #
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########################################################################
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# General SSL
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curl https://ssl-config.mozilla.org/ffdhe2048.txt > "$arg_mountpoint/etc/ssl/private/dhparam.pem"
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ln -sT "../../letsencrypt/live/$(cat "$arg_mountpoint/etc/hostname")" "$arg_mountpoint/etc/ssl/private/myhostname"
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# Have Certbot run as non-root
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useradd --root="$arg_mountpoint" --system --user-group --no-create-home --home-dir /etc/ssl --shell /usr/bin/nologin keys
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mkdir "$arg_mountpoint/etc/letsencrypt/archive" "$arg_mountpoint/etc/letsencrypt/live"
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arch-chroot -- "$arg_mountpoint" chown -R keys:keys /etc/letsencrypt /var/log/letsencrypt /var/lib/letsencrypt
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chmod 750 /etc/letsencrypt/archive /etc/letsencrypt/live
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/user.conf" <<-EOF
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[Service]
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User=keys
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UMask=0027
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/sudoers.d/10-certbot" <<-EOF
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keys ALL=(ALL) NOPASSWD: /etc/ssl/misc/certbot-hook
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EOF
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# Have the normal certbot-renew.service handle changing lists of domains.
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install -Dm755 /dev/stdin "$arg_mountpoint/etc/ssl/misc/certbot-renew" <<-'EOF'
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#!/usr/bin/env bash
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set -eu
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if [[ "$(whoami)" != keys ]]; then
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echo "$0: this script must be run as user 'keys'" >&2
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exit 1
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fi
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cd /
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# The first name listed should be the canonical host name
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domains=(
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$(cat /etc/hostname)
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$(find -L /etc/ssl/misc/certbot-domains.d -type f -executable -exec {} \;)
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)
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cmd=(
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certbot certonly
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--keep-until-expiring # only renew if nescessary
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--non-interactive
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--agree-tos
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--cert-name "${domains[0]}"
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--email "$(whoami)@${domains[0]}"
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--webroot -w /var/lib/letsencrypt
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)
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for domain in "${domains[@]}"; do
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cmd+=(-d "$domain")
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done
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umask 0027
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"${cmd[@]}"
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sudo /etc/ssl/misc/certbot-hook
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/domains.conf" <<-EOF
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[Service]
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ExecStart=
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ExecStart=/etc/ssl/misc/certbot-renew
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EOF
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# Run Certbot
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/deps.conf" <<-EOF
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[Unit]
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After=network-online.target nginx-cleartext.service
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Wants=network-online.target nginx-cleartext.service
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EOF
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systemctl --root="$arg_mountpoint" enable certbot-renew.timer
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########################################################################
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# Configure the main nginx to play nice #
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########################################################################
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gpasswd --root="$arg_mountpoint" --add=http keys
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sed -i 's|/var/log/nginx/http\.|/var/log/nginx/https.|' "$arg_mountpoint/etc/nginx/nginx.conf"
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/nginx.service.d/10-certbot.conf" <<-EOF
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[Unit]
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After=certbot-renew.service
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Wants=certbot-renew.service
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EOF
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cat >"$arg_mountpoint/etc/nginx/snippets/listen.conf" <<-'EOF'
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# -*- mode: nginx -*-
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listen 443 ssl http2;
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listen [::]:443 ssl http2;
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error_log /var/log/nginx/https.$server_name.error.log error;
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access_log /var/log/nginx/https.$server_name.access.log combined;
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# generated 2023-10-28, Mozilla Guideline v5.7, nginx 1.24.0, OpenSSL 3.1.4, intermediate configuration
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# https://ssl-config.mozilla.org/#server=nginx&version=1.24.0&config=intermediate&openssl=3.1.4&guideline=5.7
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ssl_certificate /etc/ssl/private/myhostname/fullchain.pem;
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ssl_certificate_key /etc/ssl/private/myhostname/privkey.pem;
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ssl_session_timeout 1d;
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ssl_session_cache shared:MozSSL:10m; # about 40000 sessions
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ssl_session_tickets off;
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ssl_dhparam /etc/ssl/private/dhparam.pem;
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# intermediate configuration
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ssl_protocols TLSv1.2 TLSv1.3;
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ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305;
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ssl_prefer_server_ciphers off;
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# HSTS (ngx_http_headers_module is required) (63072000 seconds)
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add_header Strict-Transport-Security "max-age=63072000" always;
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# OCSP stapling
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ssl_stapling on;
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ssl_stapling_verify on;
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# verify chain of trust of OCSP response using Root CA and Intermediate certs
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ssl_trusted_certificate /etc/ssl/private/myhostname/chain.pem;
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EOF
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install -Dm755 /dev/stdin "$arg_mountpoint/etc/ssl/misc/certbot-domains.d/10-nginx-auto" <<-'EOF'
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#!/bin/sh
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grep -oE 'server_name\s+([-.a-z0-9]+)\s*;' /etc/nginx/sites/*.conf | sed -E -e 's/server_name\s+//' -e 's/\s*;//'
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EOF
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install -Dm755 /dev/stdin "$arg_mountpoint/etc/ssl/misc/certbot-hook" <<-'EOF'
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#!/bin/sh
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if systemctl is-active nginx.service; then
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systemctl reload nginx.service
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fi
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EOF
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}
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