security: restrict picoclaw access to tailscale tailnet only

- Bind Docker port to 127.0.0.1 only (not publicly exposed)
- Remove UFW rule that opened port 18790 to the internet
- Install Tailscale in setup-server.sh with optional auth key
- Configure tailscale serve to proxy tailnet -> localhost:18790
- Add deploy workflow step to ensure tailscale serve stays active

Port 18790 is now only reachable via the tailnet, not the public internet.

https://claude.ai/code/session_019vXaqxGmkdCjM8m3jp6rYj

.github/workflows/deploy-hostinger.yml

@@ -110,6 +110,29 @@ jobs:
           echo "Docker deploy complete"
           EOF
 
+      - name: Ensure Tailscale serve is active
+        env:
+          SSHPASS: ${{ secrets.HOSTINGER_SSH_PASSWORD }}
+        run: |
+          SSH_PORT="${{ secrets.HOSTINGER_SSH_PORT }}"
+          SSH_PORT="${SSH_PORT:-22}"
+          SSH_USER="${{ secrets.HOSTINGER_SSH_USER }}"
+          SSH_USER="${SSH_USER:-root}"
+
+          sshpass -e ssh \
+            -o StrictHostKeyChecking=accept-new \
+            -o ConnectTimeout=15 \
+            -p "${SSH_PORT}" \
+            "${SSH_USER}@${{ secrets.HOSTINGER_HOST }}" <<'EOF'
+          if command -v tailscale &>/dev/null && tailscale status &>/dev/null 2>&1; then
+            tailscale serve --bg http://localhost:18790 2>/dev/null || true
+            echo "Tailscale serve active on tailnet"
+            tailscale ip -4 2>/dev/null && echo "(use the IP above or tailnet hostname to access)"
+          else
+            echo "::warning::Tailscale not installed or not authenticated. Run setup-server.sh first."
+          fi
+          EOF
+
       - name: Health check
         env:
           SSHPASS: ${{ secrets.HOSTINGER_SSH_PASSWORD }}

deploy/hostinger/docker-compose.production.yml

@@ -15,7 +15,7 @@ services:
     container_name: picoclaw-gateway
     restart: unless-stopped
     ports:
-      - "18790:18790"
+      - "127.0.0.1:18790:18790"
     volumes:
       # Configuration (read-only)
       - /opt/picoclaw/config/config.json:/root/.picoclaw/config.json:ro

deploy/hostinger/setup-server.sh

@@ -130,18 +130,37 @@ if command -v ufw &>/dev/null; then
     ufw default deny incoming
     ufw default allow outgoing
     ufw allow ssh
-    ufw allow 18790/tcp comment "PicoClaw Gateway"
+    # Port 18790 is NOT opened publicly - accessible only via Tailscale
-    # Uncomment if you need webhook ports:
-    # ufw allow 18791/tcp comment "PicoClaw Line Webhook"
     ufw --force enable
-    log "UFW firewall configured"
+    log "UFW firewall configured (port 18790 is tailscale-only)"
 elif command -v firewall-cmd &>/dev/null; then
     systemctl enable firewalld
     systemctl start firewalld
     firewall-cmd --permanent --add-service=ssh
-    firewall-cmd --permanent --add-port=18790/tcp
+    # Port 18790 is NOT opened publicly - accessible only via Tailscale
     firewall-cmd --reload
-    log "firewalld configured"
+    log "firewalld configured (port 18790 is tailscale-only)"
+fi
+
+# ── 6b. Install and configure Tailscale ──────────────
+log "Installing Tailscale..."
+if ! command -v tailscale &>/dev/null; then
+    curl -fsSL https://tailscale.com/install.sh | sh
+    log "Tailscale installed"
+else
+    log "Tailscale already installed: $(tailscale version 2>/dev/null | head -1)"
+fi
+
+if [ -n "${TAILSCALE_AUTH_KEY:-}" ]; then
+    log "Authenticating Tailscale with auth key..."
+    tailscale up --authkey="${TAILSCALE_AUTH_KEY}" --hostname="picoclaw" --ssh
+    log "Tailscale authenticated. Configuring serve..."
+    tailscale serve --bg http://localhost:18790
+    log "Tailscale serve active: https://picoclaw.TAILNET.ts.net -> localhost:18790"
+else
+    warn "TAILSCALE_AUTH_KEY not set. Run manually after setup:"
+    warn "  tailscale up --hostname=picoclaw --ssh"
+    warn "  tailscale serve --bg http://localhost:18790"
 fi
 
 # ── 7. Configure fail2ban ────────────────────────────
@@ -300,5 +319,5 @@ else
     echo "  6. View logs:      tail -f ${PICOCLAW_HOME}/logs/picoclaw.log"
 fi
 echo ""
-log "Firewall ports open: SSH (22), PicoClaw Gateway (18790)"
+log "Firewall ports open: SSH (22) only. Port 18790 accessible via Tailscale only."
 echo ""