# Access plan — eng-coulomb-railiance01-ho-001

**Target:** host `railiance01`
**Classes requested:** `host_observe`, `privileged_ops` (gated)
**Secrets:** never stored in this tree

## Intended path

| Step | Action | Owner |
|------|--------|-------|
| 1 | Inventory / facts from `railiance-hosts` (read-only) | operator |
| 2 | SSH as workstation user (tegwick) or cert via ops-warden | operator |
| 3 | Tunnel if needed (`ops-bridge`, e.g. state-hub-railiance01) | operator |
| 4 | Observe session: non-destructive health/load/os checks | host-operator agent |
| 5 | Privileged ops only after human approval recorded in vault | human + agent |

## Working path (verified 2026-07-16)

| Item | Detail |
|------|--------|
| SSH Host alias | `railiance01` in `~/.ssh/config` |
| HostName | 92.205.62.239 |
| User | tegwick |
| IdentityFile | `~/.ssh/id_custodian_agent` (also works with `id_ops` in this environment) |
| Verify command | `ssh -o BatchMode=yes railiance01 'hostname; uptime'` |
| Inventory | `railiance-hosts/inventory/servers.yaml` |
| Bridge | `state-hub-railiance01`, `issue-core-railiance01`, `state-hub-primary` **connected** (static-key) |
| Sudo | passwordless `sudo -n` available for read-only admin inspect (k3s, ufw status, needrestart) |

## Credential routing

- SSH certificates → **ops-warden** when using cert_command actors
- This pilot used **existing workstation SSH key** path (static key) for observe
- API keys / DB passwords → **OpenBao** via `warden route` (not this agent)
- Do **not** message ops-warden for secret values

## UFW k3s API admin allowlist (6443)

**Policy (since 2026-07-16 remediation):** port **6443/tcp** is **not** open to the
world. Remote k3s API / `kubectl` against the public IP works only from allowlisted
admin public IPs. **SSH (22) remains open Anywhere.**

**Full procedure:**
[`roles/host-operator/protocols/ufw-admin-allowlist.md`](../../../roles/host-operator/protocols/ufw-admin-allowlist.md)

### Current allowlist (update when changing UFW)

| Public IP | Label | Added | Notes |
|-----------|-------|-------|-------|
| 89.244.90.246 | k3s-api-operator-current | 2026-07-16 | Session IP during P4 remediation |
| 85.132.220.102 | k3s-api-operator-hist | 2026-07-16 | Historical login IP |

### Quick commands (railiance01)

```bash
# Discover your public IP (on the admin laptop)
curl -4 -s ifconfig.me; echo

# List rules
ssh railiance01 'sudo ufw status numbered verbose'

# Add admin
ssh railiance01 "sudo ufw allow from <PUBLIC_IP> to any port 6443 proto tcp comment 'k3s-api-admin-<label>'"

# Remove: use rule number from status numbered
ssh railiance01 'sudo ufw delete <N>'
```

After any change: update the table above and append a line to the verification log.
Class: **`firewall_change`** — record approval for production changes.

**Not required for:** local `sudo k3s kubectl` on the host, or API access only via SSH tunnel.

**8472/udp:** world-open rule removed (single-node). Re-add only if multi-node flannel peers need it.

UFW backup from remediation: `/etc/ufw/user.rules.bak.20260716` on host.

## Verification log

| Date | Result | Notes |
|------|--------|-------|
| 2026-07-16 | **OK** | ICMP OK; `ssh railiance01` shell OK; host_observe assessment (RU-01) |
| 2026-07-16 | **OK** | UFW 6443 restricted to allowlist; 8472 closed externally (P4) |

## Revocation

| Date | Action |
|------|--------|
| _open_ | On ramp-down: stop renewing agent certs/keys used for this engagement; set schedule disabled; remove temporary admin UFW rules if desired; mark here |