Initial commit: Hermes Agent Skills collection
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---
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name: network-reconnaissance
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description: "Class-level skill for network reconnaissance from containerized and general environments. Covers internal subnet scanning (TCP sweep, port scan, service detection, TLS/SSH analysis), external domain/service reconnaissance (DNS, SSL, HTTP headers, API discovery), and automated recurring scan setups."
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version: 1.0.0
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tags: [network, reconnaissance, scanning, security, dns, ssl, ports, containers]
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---
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## Overview
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This umbrella skill consolidates all network scanning and reconnaissance capabilities:
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- **Internal Subnet Scanning** — TCP sweep, port scanning, banner grabbing, SSH/TLS analysis from containers or Python
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- **External Domain Reconnaissance** — DNS, SSL certificates, HTTP headers, API/service discovery
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- **Automated Recurring Scans** — Weekly cronjob-based scanning with change detection
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No nmap, no root privileges required. Pure Python stdlib (`socket`, `ssl`, `concurrent.futures`) for container environments.
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---
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## Section 1: Internal Subnet Scanning
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### 1.1 Network Layout Discovery
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**Always discover the actual IP format first.** Users may describe segments as "50.x" but the real network may be `10.0.X.Y`.
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```bash
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ip addr show eth0 | grep inet
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ip route show
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ping -c 1 -W 2 10.0.50.1
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ping -c 1 -W 2 50.0.50.1
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```
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Common formats:
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- `10.0.X.Y` where X = segment index (e.g., 10.0.20.10 = Hypervisor)
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- Container usually sits in one segment (e.g., 10.0.30.230)
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### 1.2 Two-Phase Scan Workflow
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**Phase 1 — Host Discovery (fast TCP sweep)**
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```python
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import socket, concurrent.futures
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PROBE_PORTS = [443, 80, 22, 2222, 3306, 8080, 8443]
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def host_alive(ip, ports=PROBE_PORTS, timeout=0.3):
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for p in ports:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.settimeout(timeout)
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if sock.connect_ex((ip, p)) == 0:
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sock.close(); return True
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sock.close()
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return False
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with concurrent.futures.ThreadPoolExecutor(100) as pool:
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alive = [ip for ip, ok in zip(segment_ips, pool.map(host_alive, segment_ips)) if ok]
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```
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**Phase 2 — Deep Scan (per host)**
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```python
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IMPORTANT_PORTS = {
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22: "SSH", 23: "Telnet", 25: "SMTP", 53: "DNS", 80: "HTTP",
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443: "HTTPS/TLS", 1883: "MQTT", 2222: "SSH-alt",
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2375: "Docker", 2376: "Docker-TLS", 3306: "MySQL",
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5432: "PostgreSQL", 6379: "Redis", 8080: "HTTP-alt",
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8443: "HTTPS-alt", 8883: "MQTT-TLS", 9090: "Prometheus/Grafana",
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9200: "Elasticsearch", 11211: "Memcached", 27017: "MongoDB",
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}
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def deep_scan(ip):
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hostname = socket.gethostbyaddr(ip)[0] # may be None
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ports = scan_host_ports(ip, IMPORTANT_PORTS, workers=30)
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tls = analyze_tls(ip) if any(p[0]==443 for p in ports) else None
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ssh = get_ssh_banner(ip, 22) or get_ssh_banner(ip, 2222)
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web = get_web_header(ip, 80)
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return {"ip": ip, "hostname": hostname, "ports": ports, "tls": tls, "ssh": ssh, "web_server": web}
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```
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### 1.3 TLS Analysis
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```python
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def analyze_tls(ip, port=443, timeout=5.0):
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ctx = ssl.create_default_context()
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ctx.check_hostname = False
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ctx.verify_mode = ssl.CERT_NONE
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try:
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with socket.create_connection((ip, port), timeout=timeout) as sock:
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with ctx.wrap_socket(sock, server_hostname=ip) as s:
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return {
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"protocol": s.version(), "cipher": s.cipher()[0],
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"cert_cn": next((f[0][1] for f in s.getpeercert().get("subject",[]) if f[0][0]=="commonName"), None),
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"cert_issuer": next((f[0][1] for f in s.getpeercert().get("issuer",[]) if f[0][0]=="commonName"), None),
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"valid_from": s.getpeercert().get("notBefore"),
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"valid_until": s.getpeercert().get("notAfter"),
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}
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except Exception as e:
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return {"error": str(e)[:80]}
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```
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### 1.4 SSH Banner Grab
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```python
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def get_ssh_banner(ip, port=22, timeout=5.0):
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sock = socket.create_connection((ip, port), timeout=timeout)
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banner = sock.recv(256).decode("utf-8", errors="ignore").strip()
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sock.close(); return banner
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```
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### 1.5 Output Format
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```json
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{
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"scan_date": "2026-05-17T08:03:11.184435+00:00",
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"total_hosts": 60,
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"scan_duration_seconds": 94.4,
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"segments": {
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"Hypervisor": {"subnet": "10.0.20.0/24", "alive_count": 10, "hosts": [...]},
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"Container": {"subnet": "10.0.30.0/24", "alive_count": 26, "hosts": [...]},
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"Smart Home": {"subnet": "10.0.50.0/24", "alive_count": 24, "hosts": [...]}
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}
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}
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```
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- `hostname` is usually `null` (no reverse-DNS in internal networks)
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- `vendor` and `mac` are NOT included (no MAC access from container)
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---
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## Section 2: External Domain & Service Reconnaissance
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### 2.1 DNS Resolution
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```bash
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getent hosts cloud.familie-schoen.com
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host cloud.familie-schoen.com
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```
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### 2.2 Port Scanning (Bash /dev/tcp)
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```bash
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bash -c 'echo >/dev/tcp/HOST/PORT 2>&1 && echo open || echo closed'
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# Common ports: 22, 25, 53, 80, 443, 587, 993, 995, 3306, 5432, 8080, 8443, 9090
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```
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### 2.3 HTTP/HTTPS Analysis
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```bash
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curl -sI http://DOMAIN
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curl -ksI https://DOMAIN
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curl -kI -L https/DOMAIN
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curl -ks https://DOMAIN/path
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# Security headers:
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curl -ksI https://DOMAIN | grep -iE 'strict-transport|content-security|x-frame|x-xss|cache-control'
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```
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### 2.4 SSL Certificate Extraction
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```bash
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openssl s_client -connect HOST:443 -servername HOST 2>&1 </dev/null
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openssl s_client -connect HOST:443 -servername HOST 2>&1 </dev/null | \
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openssl x509 -noout -subject -issuer -dates -ext subjectAltName
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```
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### 2.5 API/Service Discovery
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```bash
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for endpoint in /api/v1/version /api/health /healthz /version /status /robots.txt; do
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r=$(curl -ks https://HOST$endpoint)
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[ -n "$r" ] && echo "$endpoint: $r"
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done
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```
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Common services to fingerprint:
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- Seafile: `/api2/server-info/`, `/seafhttp/`
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- GitLab: `/api/v4/version`
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- Nextcloud: `/.well-known/caldav`
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- Grafana: `/api/health`
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- Prometheus: `/metrics`
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### 2.6 HTML Content Analysis
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```bash
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curl -ks https://DOMAIN | grep -ioE '<title>[^<]+'
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curl -ks https://DOMAIN | grep -ioE 'wordpress|django|flask|react|angular|nextcloud|seafile|gitea|jenkins|grafana|prometheus'
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```
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---
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## Section 3: Automated Recurring Scanning
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For SRE-style weekly network scans with change detection, set up a `no_agent` cronjob:
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```bash
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# 1. Write the scan script to ~/.hermes/scripts/network-scan.py
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# 2. Create the cronjob:
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cronjob action=create \
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name="weekly-network-scan" \
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script="network-scan.py" \
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schedule="0 8 * * 0" \
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no_agent=true \
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deliver="origin"
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```
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**Critical rules:**
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- `script` parameter accepts **filename only** (relative to `~/.hermes/scripts/`), NOT an absolute path.
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- Prefer `--no-agent` for pure script execution — faster, avoids model format issues.
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- After any Hermes update, verify cron job model format (see `references/cron-model-fix.md`).
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### Change Detection
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Load the previous scan file and diff:
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- New IPs → new hosts
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- Missing IPs → gone hosts
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- New ports on existing hosts → new services
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- Different SSH banners → version changes
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---
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## Pitfalls
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| Pitfall | Symptom | Solution |
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| Using nmap | Permission denied | Use Python stdlib only |
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| Using arping | Hangs forever | NEVER use arping in containers |
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| Using `ip neigh` for MAC | No MACs returned | OUI vendor detection is useless from container |
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| Sequential TCP scan | 14+ min for /24 | Use ThreadPoolExecutor (100 workers sweep, 30 deep scan) |
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| Wrong IP format | Can't reach targets | Verify with `ip route` and `ping` first |
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| `script` path absolute | Cronjob fails | Use filename only in `script` param |
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| Cron model null after update | `Error code: 400` | Update with `provider/model` format |
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| ShareGPT first-run delay | 2–5 min wait | Pre-download once before benchmark suite |
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| NumPy X86_V2 crash | `RuntimeError: NumPy...X86_V2` | `pip install "numpy<2.0" --force-reinstall` |
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| Prefill throughput bias | First request inflates latency | Pre-warm with throwaway run, or filter `turn_index=0` from JSONL |
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---
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## References
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- `references/container-network-recon-session-2026-04.md` — Session notes from initial network discovery
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- `references/domain-service-recon-familie-schoen.md` — External domain scan example
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- `references/cron-model-fix.md` — Post-Hermes-update cron job model fix
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- `scripts/network-scan.py` — Full internal scan script (copy to `~/.hermes/scripts/`)
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