256 lines
8.5 KiB
Bash
256 lines
8.5 KiB
Bash
#!/hint/bash -euE
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# Copyright (C) 2023-2024 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+=(30:acme:post_install) # must be after '20:nginx:post_install' and '10:osi-mk:hostname'
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acme: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/cleartext-error.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/cleartext-error.http.log error;
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access_log /var/log/nginx/cleartext-access.http.log combined;
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types_hash_max_size 4096;
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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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########################################################################
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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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install -Dm644 /dev/stdin "$arg_mountpoint"/etc/sysusers.d/certbot.conf <<-EOF
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u keys - "Certbot" /etc/ssl
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint"/etc/tmpfiles.d/certbot.conf <<-EOF
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d /etc/letsencrypt 0755 keys keys
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d /etc/letsencrypt/archive 0750 keys keys
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d /etc/letsencrypt/live 0750 keys keys
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d /var/lib/letsencrypt 0755 keys keys
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d /var/log/letsencrypt 0700 keys keys
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/10-user.conf" <<-EOF
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[Service]
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User=keys
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UMask=0027
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EOF
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install -Dm644 /dev/stdin "$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 certbot-renew.service Depend on the above nginx setup ###########
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/10-deps.conf" <<-EOF
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[Unit]
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After=network-online.target nginx-cleartext.service nss-lookup.target
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Wants=network-online.target nginx-cleartext.service
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EOF
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# Add certbot-init.service for at boot #################################
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install -Dm755 /dev/stdin "$arg_mountpoint/etc/ssl/misc/certbot-init" <<-'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 "$0: this script must be run as user 'keys'" >&2
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exit 1
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fi
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cd /
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my_addrs=($(ip addr | awk '$1 == "inet" || $1 == "inet6" { print $2 }' | cut -d/ -f1 | sort -u))
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echo 'Local addresses:'
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printf ' - %s\n' "${my_addrs[@]}"
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# The first name listed should be the canonical host name
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domains=(
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$(cat /etc/hostname)
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)
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auto_domains=(
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$(find -L /etc/ssl/misc/certbot-domains.d -type f -executable -exec {} \;)
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)
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for domain in "${auto_domains[@]}"; do
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domain_addrs=($(getent ahosts "$domain" | awk '{print $1}' | sort -u))
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if [[ -n "$(comm -12 <(printf '%s\n' "${my_addrs[@]}") <(printf '%s\n' "${domain_addrs[@]}"))" ]]; then
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domains+=("$domain")
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else
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echo >&2 "WARNING: skipping ${domain} (${domain_addrs[*]})"
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fi
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done
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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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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-init.service" <<-EOF
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[Unit]
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[Install]
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WantedBy=multi-user.target
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EOF
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install -d "$arg_mountpoint/etc/systemd/system/certbot-init.service.d"
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ln -s /usr/lib/systemd/system/certbot-renew.service "$arg_mountpoint"/etc/systemd/system/certbot-init.service.d/00-base.conf
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ln -sr "$arg_mountpoint"/etc/systemd/system/certbot-renew.service.d/* "$arg_mountpoint"/etc/systemd/system/certbot-init.service.d/
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-init.service.d/20-command.conf" <<-EOF
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[Service]
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ExecStart=
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ExecStart=/etc/ssl/misc/certbot-init
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EOF
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# Have certbot-renew.service also use that script ######################
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install -Dm755 /dev/stdin "$arg_mountpoint/etc/ssl/misc/certbot-renew" <<-'EOF'
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#!/usr/bin/env bash
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set -eu
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. /etc/ssl/misc/certbot-init
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sudo /etc/ssl/misc/certbot-hook
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/certbot-renew.service.d/20-command.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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# Enable ###############################################################
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systemctl --root="$arg_mountpoint" enable certbot-renew.timer
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systemctl --root="$arg_mountpoint" enable certbot-init.service
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########################################################################
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# Configure the main nginx to play nice #
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########################################################################
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install -Dm644 /dev/stdin "$arg_mountpoint"/etc/sysusers.d/nginx.conf <<-EOF
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m nginx keys
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EOF
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install -Dm644 /dev/stdin "$arg_mountpoint/etc/systemd/system/nginx.service.d/10-certbot.conf" <<-EOF
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[Unit]
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After=certbot-init.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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# 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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sed -En 's/^\s*server_name\s+([^;]+);\s*$/\1/p' /etc/nginx/sites/*.conf
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EOF
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install -Dm755 /dev/stdin "$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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