# Root SSH Exception for Admin Servers

**Standard policy:** `PermitRootLogin no` + `AllowUsers ippadmin` on all servers.

**Exception granted for:** app1, app2, app3 (netcup RS 4000 G12 admin/infrastructure servers).

**Rationale:** Automated provisioning and deployment by Sho'Nuff requires root-level access without sudo password workarounds. These servers run infrastructure services (AI stack, networking management, WordPress platform) that need frequent configuration changes.

**Restrictions:**
- Root access is **key-only** — no password authentication
- Only the `itpp-infra` SSH key is authorized
- `/root/.ssh/authorized_keys` contains the same key as ippadmin's
- `AllowUsers ippadmin root` — both users explicitly allowed
- `PasswordAuthentication no` still enforced
- `PermitRootLogin prohibit-password` (key only, no password)

**Setup commands (from Core):**
```bash
ssh -i /root/.ssh/itpp-infra ippadmin@<server>
# Deploy root's authorized_keys
sudo mkdir -p /root/.ssh
sudo cp /home/ippadmin/.ssh/authorized_keys /root/.ssh/
sudo chmod 700 /root/.ssh
sudo chmod 600 /root/.ssh/authorized_keys
# Update sshd_config
sudo sed -i 's/^PermitRootLogin no/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config
sudo sed -i 's/^AllowUsers.*/AllowUsers ippadmin root/' /etc/ssh/sshd_config
sudo systemctl restart sshd
```

**Verification:**
```bash
ssh -i /root/.ssh/itpp-infra root@<server> "hostname"
```

**Pitfall:** If ippadmin was created with `--disabled-password`, `su` and `sudo -S` will fail because there's no password. This blocks automated provisioning via ippadmin. Solution: set up root SSH BEFORE closing the initial root session during provisioning, or use the netcup console.
