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feat(us4): firewall audit + safe reconciliation playbook, host doc

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Add playbooks/us4-firewalld.yml, a narrow reconciliation of the audited us4
public zone: fails closed on drift or unknown allowances, never reloads or
restarts firewalld, and does not manage Docker rules. Requires explicit
apply + provider-console confirmations, backs up the firewalld config and
ruleset, schedules an automatic 15-minute rollback via at, and verifies SSH,
HTTPS routes, containers, Fail2ban jails, and the WireGuard health check before
cancelling rollback. Pins ansible.posix 2.2.2 in requirements.yml.

Also expand hosts/us4.wsvc.info.md with deployment config and a live audit
snapshot (2026-08-12).
This commit is contained in:
windyboy
2026-08-12 21:16:31 +08:00
parent 035587e3bf
commit 1f6d028ab5
3 changed files with 594 additions and 1 deletions
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hosts/us4.wsvc.info.md
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@@ -9,10 +9,74 @@
| Compose file | `/opt/wireguard/compose.yml` |
| Container | `wireguard` |
| Image policy | Immutable digest, updated only in an approved maintenance window |
| Public port | UDP `51820` on IPv4 and IPv6 |
| Public endpoint | `us4.wsvc.info:51820/udp`; DNS publishes only A `185.201.226.122` (no native AAAA) |
| Tunnel subnet | `10.13.13.0/24` |
| Routing policy | IPv4-only full tunnel (`ALLOWEDIPS=0.0.0.0/0`); IPv6 traffic is not guaranteed to use the VPN |
Upstream image documentation:
[LinuxServer.io WireGuard](https://docs.linuxserver.io/images/docker-wireguard/).
## Deployment configuration
The repository-owned, non-secret Compose declaration is rendered from
`ansible/templates/wireguard-compose.yml.j2`. The live declaration was verified
on 2026-08-12 with these core settings:
| Setting | Live value / intent |
|---------|---------------------|
| Image | `lscr.io/linuxserver/wireguard@sha256:ac43e1226878d2611315172d6ea357a95cb326ee73124b91108118efc8666889` |
| Image version | `1.0.20260223-r0-ls119` (build 2026-07-30) |
| Required capability | `NET_ADMIN` only; host kernel already supplies WireGuard/iptables, so `SYS_MODULE` and `/lib/modules` are not granted |
| Filesystem | Read-only container root; executable tmpfs at `/run`; writable bind mount `/opt/wireguard/config:/config` |
| Restart | `unless-stopped` |
| Server mode | Named peers `ha`, `phone`, `mbp`; runtime and configured peer counts both `3` |
| Client DNS | `1.1.1.1` |
| Tunnel routing | IPv4 full tunnel, `0.0.0.0/0`; no client IPv6 tunnel |
| Runtime interface | `wg0`, server address `10.13.13.1/32`, listen port `51820` |
| Forwarding/NAT | IPv4 forwarding enabled in the container namespace; `wg0` forwarding allowed and egress masqueraded on `eth+`; IPv6 forwarding disabled |
Docker binds UDP `51820` on both host socket families, but the public hostname
has no AAAA record. Clients using `us4.wsvc.info` therefore reach the server over
IPv4.
## Other host services and firewall (2026-08-12)
This host also carries the `windy.me` secondary MX and several web applications;
do not build its firewall allowlist from the WireGuard role alone.
| Port | Owner / purpose | Effective public state |
|------|-----------------|------------------------|
| TCP `22` | SSH management | Open |
| TCP `25` | Postfix, `mx.windy.me` (MX priority 30) | Open; retain until the secondary-MX role is explicitly retired |
| TCP `80`, `443` | Traefik for `update.wsvc.info`, `us4-gate.wsvc.info`, and `trlm.wsvc.info` | Open |
| TCP `3000` | Semaphore UI direct Docker publish | Open; redundant with the Traefik route and should be removed or bound to loopback |
| TCP `8080` | Traefik direct Docker publish | Open; redundant with the authenticated dashboard route and should be removed or bound to loopback |
| UDP `51820` | WireGuard | Required public endpoint |
| TCP `9443` | Host nghttpx-to-Squid proxy | Listening but blocked by the current firewall |
| UDP `123` | ntpsec | Listening but blocked by the current firewall |
PostgreSQL (`5433`/`5434`/`5435`), MariaDB (`3306`), and the host Squid TCP
listener (`3128`) are loopback-only. Squid also owns wildcard UDP sockets, which
are not allowed by the current public zone.
UFW is not installed. Firewalld `2.3.1` is active with nftables. On 2026-08-12,
the reviewed `ansible/playbooks/us4-firewalld.yml` reconciliation removed the
stale `imap`, `imaps`, `smtp-submission`, and `smtps` services plus TCP `24`,
`6443`, and `8443` without reloading or restarting firewalld. Runtime and
permanent public-zone state now match exactly: services `dhcpv6-client`, `http`,
`https`, `smtp`, and `ssh`, with no explicit ports.
Docker-published ports are accepted through Docker's DNAT/FORWARD chains, so
the public-zone cleanup does not close `3000` or `8080`. Their Compose bindings
remain a separate, staged follow-up after the required observation window.
Firewalld logged Docker chain/policy conflicts during the 2026-08-10 boots;
treat any firewall reload or service restart as a maintenance-window operation
and reverify Docker routing. Tracking: Linear `W1N-60`.
`mx.windy.me` also publishes AAAA `2602:f9f3:0:2::878`, while the host currently
has no global IPv6 address or IPv6 default route. Treat that as a separate
secondary-MX reachability issue.
## Safety
- Private keys, preshared keys, peer configuration files, and QR codes remain
@@ -21,6 +85,17 @@
- Local rollback archives are stored in `/opt/wireguard/backups` (directory
mode `0700`, archives mode `0600`). They contain private keys, are not an
off-host disaster-recovery backup, and must never leave the server.
- Live private keys, preshared keys, generated peer configs, QR images, and
`wg0.conf` are mode `0600`. Template-only `peer.conf` and `server.conf` files
are mode `0644` and do not contain generated key material.
- `/opt/wireguard/config` is mode `0755`, but its sensitive files are `0600`.
The current files are owned by the image's numeric UID/GID rather than the
declared `PUID=1000` / `PGID=1000`; the root-run WireGuard processes can use
them, but reconcile ownership only after a protected backup and maintenance
review.
- `LOG_CONFS` is currently unset and the inspected container log contained no
QR-code/config banners. Do not enable config logging; generated QR images are
credentials.
- Do not delete, move, or regenerate `/opt/wireguard/config` during
maintenance.
- Before a container recreation, validate `docker compose config` and retain a
@@ -35,6 +110,23 @@ cd ansible
ansible-playbook playbooks/health-report.yml --limit wireguard
```
Preview the narrow, fail-closed public-zone reconciliation:
```bash
ansible-galaxy collection install -r requirements.yml
ansible-playbook playbooks/us4-firewalld.yml --limit us4 --check --diff
```
Apply it only after testing the provider console and keeping an independent SSH
rollback session open. The playbook creates a protected server-local backup and
a 15-minute automatic rollback before changing rules; it cancels that rollback
only after SSH, HTTPS, SMTP, Docker, Fail2ban, and WireGuard checks pass:
```bash
ansible-playbook playbooks/us4-firewalld.yml --limit us4 \
-e '{"us4_firewalld_confirm": true, "us4_console_confirm": true}'
```
The image update and recreate procedure is deliberately separate and requires
an immutable image digest in the server-side Compose file plus an explicit
maintenance-window confirmation:
@@ -59,3 +151,43 @@ ansible-playbook playbooks/wireguard-harden.yml --limit wireguard \
- Validate a known client can handshake and sends IPv4 traffic through the VPN.
- Do not treat inactive mobile peers as a failure solely because their latest
handshake is old.
## Live audit snapshot (2026-08-12)
The WireGuard service itself is healthy and its installation is broadly
reasonable:
- The sanitized Ansible health report returned `status=ok`; Compose is valid,
the container is running with zero restarts, `wg0` exists, and UDP `51820` is
listening.
- One of three peers had a current handshake during the audit. Two peers had
not handshaken since the current container/interface start; confirm those
clients only if they are expected to be active.
- The image is immutable-digest pinned, key-bearing files are protected, the
container root is read-only, and the container has `NET_ADMIN` without the
broader `SYS_MODULE` capability.
- Debian `13.6`, kernel `6.12.101+deb13-amd64`, Docker Engine `29.7.2`, and
Docker Compose `v5.4.0` were observed. No Debian package updates or reboot
requirement were pending.
Open host-level follow-up (do not conflate these with a WireGuard outage):
1. **Disk capacity:** `/` was 90% used with about 3.4 GiB free. Docker reported
about 2.48 GB of reclaimable images and the system journal used about 1.9
GB, but do not prune or vacuum without reviewing retention and rollback
needs first.
2. **Docker exposure:** the firewalld public-zone cleanup is complete, but
Docker still publishes `3000` and `8080` outside the ordinary host INPUT
path. Remove those redundant Compose bindings in separate maintenance units
after the observation window, and confirm provider firewall rules first.
3. **Image maintenance:** the upstream `latest` amd64 image had advanced to
`1.0.20260223-r0-ls120` (build 2026-08-06). Review and pin its immutable
digest in a maintenance window rather than updating unattended.
4. **Host hygiene:** `apache2.service`, `certbot.service`, and
`postgresql@9.6-main.service` were in a failed state while unrelated Docker
workloads remained active. Establish ownership and remove or repair stale
units separately.
5. **Resource/log limits:** the WireGuard container has no memory, CPU, or PID
limit and uses Docker's `json-file` log driver without a per-container
rotation setting. Current log size was small, but limits/rotation should be
considered during a reviewed Compose update.