96 lines
3.3 KiB
Nix
96 lines
3.3 KiB
Nix
{ config, pkgs, lib, ... }:
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{
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# ── Ensure njalla directory exists on every build ────────────────────────
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systemd.tmpfiles.rules = [
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"d /var/lib/njalla 0750 root root -"
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];
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# ── Safe DDNS update service ─────────────────────────────────────────────
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# Reads DDNS update URLs from the JSON store written by the Hub API and
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# invokes curl directly — no shell interpolation, no script execution.
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# Replaces the legacy root cron job that ran /var/lib/njalla/njalla.sh.
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systemd.services.sovran-ddns-update = {
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description = "Sovran Njal.la DDNS update (safe JSON-based runner)";
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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ExecStart = "${pkgs.python3}/bin/python3 /var/lib/sovran/ddns-update.py";
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# Harden the service — it only needs network access and read access to
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# /var/lib/njalla/ddns_urls.json.
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NoNewPrivileges = true;
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ProtectSystem = "strict";
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ReadWritePaths = [ "/var/lib/njalla" ];
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ProtectHome = true;
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PrivateTmp = true;
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
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};
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};
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# Run the update every 15 minutes
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systemd.timers.sovran-ddns-update = {
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description = "Sovran Njal.la DDNS update timer";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnBootSec = "2min";
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OnUnitActiveSec = "15min";
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Persistent = true;
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};
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};
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# Install the Python runner script at build time so the service can find it.
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# The script is owned by root and not world-writable.
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system.activationScripts.sovran-ddns-update-script = ''
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install -d -m 0755 /var/lib/sovran
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cat > /var/lib/sovran/ddns-update.py <<'PYEOF'
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#!/usr/bin/env python3
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"""Sovran safe DDNS update runner. Read ddns_urls.json, call curl per URL."""
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import ipaddress, json, os, subprocess
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URLS_FILE = "/var/lib/njalla/ddns_urls.json"
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ALLOWED_HOSTS = frozenset(["njal.la", "www.njal.la"])
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try:
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with open(URLS_FILE) as f:
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urls = json.load(f)
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if not isinstance(urls, list):
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raise ValueError("not a list")
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except Exception:
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raise SystemExit(0) # no URLs configured — nothing to do
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# Resolve current public IP once
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public_ip = ""
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try:
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r = subprocess.run(
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["dig", "@resolver4.opendns.com", "myip.opendns.com", "+short", "-4"],
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capture_output=True, text=True, timeout=10,
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)
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raw = r.stdout.strip().splitlines()[0] if r.stdout.strip() else ""
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ipaddress.ip_address(raw) # validates
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public_ip = raw
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except Exception:
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pass
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import urllib.parse
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for raw_url in urls:
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try:
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url = raw_url.replace("\${IP}", public_ip) if public_ip else raw_url
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parsed = urllib.parse.urlparse(url)
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if parsed.scheme.lower() != "https":
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continue
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if (parsed.hostname or "").lower() not in ALLOWED_HOSTS:
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continue
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subprocess.run(
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["curl", "--silent", "--max-time", "15", "--fail", "--no-location", url],
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timeout=20, check=False,
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
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)
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except Exception:
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pass
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PYEOF
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chmod 0500 /var/lib/sovran/ddns-update.py
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'';
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}
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