SHOW

Security Host Observation & Weakness Detection

A containerized internal network reconnaissance and vulnerability assessment platform designed for rapid discovery and security validation of on-premise infrastructure.

Overview

SHOW automates the discovery and assessment of internal network assets through a coordinated pipeline of network scanning and security assessment tools. It's designed for security teams, IT administrators, and penetration testers who need fast, reliable visibility into internal attack surfaces.

What SHOW Does

subnets → masscan (fast sweep) → nmap (service detection) → httpx (web services)
        → nuclei (vulnerabilities) → testssl (TLS) → gowitness (screenshots)
        → normalized sensor-output streams (hosts / services / web_assets / tls / findings)

Key Capabilities:

⚡ Ultra-fast network discovery (Layer 2/3)
🔍 High-speed port scanning (10,000+ pps)
🌐 Service fingerprinting and version detection
🌍 HTTP/HTTPS service profiling
🎯 Template-based vulnerability scanning
🔒 TLS/SSL configuration assessment
📸 Visual reconnaissance (screenshots)
🛡️ Authenticated deep vulnerability assessment → separate EXPOSE module (SHOW is unauthenticated-only)
📊 Structured outputs (JSON, CSV, NDJSON)

Quick Start

Prerequisites

Linux host (native) — SHOW runs its tools in network_mode: host for raw packets and local-segment discovery. On macOS/Windows use a Linux VM with bridged networking (Docker Desktop's "host" is its own VM, not your LAN).
Docker Engine (rootful) & Docker Compose
yq (YAML processor) - Installation guide
jq (JSON processor) - Usually pre-installed on Linux/macOS
Permission to use Docker — membership in the docker group, or prefix commands with sudo. SHOW needs no other root access: the raw-packet capabilities (NET_RAW / NET_ADMIN) are granted to the scanning containers by docker-compose.show.yml.

Installation

# Clone the repository
git clone https://github.com/jonathanristo/SHOW.git
cd SHOW

# Add targets — IP, CIDR (any size), or hostname, one per line
cp data/in/subnets.txt.example data/in/subnets.txt
cat > data/in/subnets.txt <<EOF
10.0.1.50
192.168.1.0/24
10.0.0.0/16
EOF

# First-time setup: builds the discovery image + downloads Nuclei templates
./showctl setup

# Run your first scan
./showctl run daily

First Run

# Daily scan (fast, high/critical findings only)
./showctl run daily

# Results will be in:
./data/out/[timestamp]/

Note: masscan and nmap craft raw packets; the containers get those capabilities from the compose file, so your shell only needs Docker access. Running SHOW with sudo works too, but leaves data/out/ owned by root.

Set SHOW_AUTHORIZED_BY to record who authorized the scan in run_manifest.json (it reads UNATTESTED otherwise):

SHOW_AUTHORIZED_BY="J. Doe / CHG-1234" ./showctl run daily

Usage

Basic Commands

# First-time setup (discovery image + Nuclei templates)
./showctl setup

# Validate show.yaml (types / enums / port specs) without scanning
./showctl config-check

# Discovery only (masscan → arp/nbt → nmap → httpx); exits non-zero if a primary tool failed
./showctl discover

# Daily workflow (recommended for routine scanning)
./showctl run daily

# Weekly workflow (deeper: full ports, medium severity)
./showctl run weekly

# Re-merge/normalize an existing run's outputs (latest run, or a given dir)
./showctl merge [data/out/<timestamp>]

What Each Profile Does

Daily Profile (`run daily`)

Duration: ~10-30 minutes
Scope: Fast discovery + high/critical vulnerabilities
Tools: masscan (+ arp-scan / nbtscan enrichment) → nmap → httpx → nuclei (high/crit) → testssl → gowitness → merge

Weekly Profile (`run weekly`)

Duration: ~30-90 minutes
Scope: Everything in daily, deeper
Tools: daily + full-port masscan + medium-severity nuclei

Authenticated deep vulnerability assessment (OpenVAS/Greenbone) is not part of SHOW — it lives in the separate EXPOSE module. SHOW is unauthenticated-only.

Configuration

show.yaml is the single source of truth for tuning SHOW — every knob is documented inline, right next to its value. This section is the narrative overview; open show.yaml for the full annotated list.

inputs:
  targets_file: "./data/in/subnets.txt"   # IP / CIDR (any size) / hostname, one per line
  hosts_file:   "./data/in/hosts.txt"     # optional, unioned with targets_file

scan:
  masscan:
    rate: 10000            # packets/sec (~10 Mbps). 5000 conservative · 50000 aggressive
    ports: "1-1024,3306,3389,5432,8080,..."   # explicit TCP port spec (masscan has no "top-N")
    full_ports: "0-65535"  # used by `run weekly` only
    exclude_private: false # true = skip the RFC 1918 ranges
  arp_scan:  { enable: true }    # local-segment MAC enrichment (best-effort)
  nbtscan:   { enable: true }    # NetBIOS name enrichment (best-effort)
  nmap:
    timing: "T4"                 # T0 (paranoid) … T5 (insane)
    version_intensity: "light"   # light | full
  httpx:    { rate_limit: 400 }  # requests/sec
  nuclei:
    severity_daily:  "high,critical"
    severity_weekly: "medium,high,critical"
    rate_limit: 200
    concurrency: 50
  tls:      { testssl: true }

screenshots:
  enable: true
  gowitness: { workers: 10, delay: 0 }

output:
  root: "./data/out"

TCP-only. SHOW's chain (nmap -sV, httpx, testssl, gowitness) probes TCP/web services, so masscan port specs must be TCP — config-check rejects UDP (U:) specs. UDP / authenticated depth belongs to EXPOSE.

Common scenarios

Conservative (fragile / IDS-monitored network):

scan: { masscan: { rate: 5000 }, nmap: { timing: "T2" } }

Aggressive (fast, loud — lab or maintenance window):

scan: { masscan: { rate: 50000 }, nmap: { timing: "T5" } }

Single host or a /16 — no config change: just put the IP or CIDR in data/in/subnets.txt; masscan expands CIDRs of any size.

Authenticated vulnerability assessment (credentials into hosts) is not part of SHOW — it lives in the separate EXPOSE module. SHOW stays unauthenticated.

Output Structure

data/out/20260125T143022Z/      # one dir per run, UTC timestamp (YYYYMMDDTHHMMSSZ)
├── in_ips.txt / in_cidrs.txt / in_hosts.txt   # Targets split by type
├── host_context.tsv           # hostname → resolved IP(s), feeds the record envelope
├── targets_all.txt            # Classified + resolved scan targets
├── masscan.list               # Raw masscan output (open host:port)
├── hosts_ports.txt            # Discovered host:port
├── hosts_alive.txt            # Live hosts (+ hosts_alive_v4.txt / hosts_alive_v6.txt)
├── arp.tsv                    # ip → MAC (local segment, if arp-scan enabled)
├── nbt.tsv                    # ip → NetBIOS name (if nbtscan enabled)
├── nmap.xml / nmap.gnmap      # IPv4 service fingerprints (XML parsed for services + OS)
├── nmap6.xml / nmap6.gnmap    # IPv6 pass (only if IPv6 hosts were found)
├── urls.txt                   # http:// + https:// candidates for every open port (httpx input)
├── httpx.json                 # HTTP service details (raw)
├── live_urls.txt              # URLs httpx confirmed live (nuclei input)
├── https_urls.txt             # Live HTTPS URLs (testssl input)
├── shot_urls.txt              # Live URLs (gowitness input)
├── nuclei.jsonl               # Vulnerability findings (raw)
├── testssl.json               # TLS/SSL assessment (raw)
├── screenshots/               # Screenshot images
├── gowitness.jsonl            # Screenshot manifest (stateless)
├── run_manifest.json          # Run metadata: operator, authorized_by, targets, duration, streams, status
│
│   # ── Normalized sensor-output/1.0 streams — the BACKSTAGE contract ──
├── hosts.ndjson               # Hosts (+ mac / netbios / os)
├── services.ndjson            # Open services (service/product/version/cpe)
├── web_assets.ndjson          # HTTP(S) endpoints
├── tls.ndjson                 # TLS certificates (fingerprint_sha256 anchor)  (if testssl ran)
├── findings.ndjson            # Normalized vulns (nuclei + testssl)
│
└── *.csv                      # hosts / open_ports / web_assets / tls / findings_summary (human exports)

Run status

run_manifest.json carries a status so a downstream consumer never mistakes a broken scan for a clean one:

ok — every tool ran and normalization completed.
degraded — the scan finished and emitted partial data, but a primary tool failed to run or produced malformed output; the offending tools are listed in degraded_tools[]. A failed tool is never silently reported as an empty "clean" result.
normalize_failed — the normalizer did not complete; run daily / run weekly also exit non-zero.

Standalone ./showctl discover writes no manifest, so it signals a degraded run via a non-zero exit code instead.

Tool Stack

SHOW leverages battle-tested network and security tools:

Phase	Tool	Purpose
Discovery	masscan	Ultra-fast port scanning
	arp-scan	Layer 2 host discovery
	nbtscan	NetBIOS/Windows name resolution
Fingerprinting	nmap	Service & OS detection (`-sV -O`)
	httpx	HTTP probing & tech detection
Assessment	nuclei	Template-based vulnerability scanning
	testssl.sh	TLS/SSL security assessment
Recon	gowitness	Screenshot capture & reporting

Architecture

┌─────────────────────────────────────────────────────────────┐
│                     showctl (Bash)                          │
│           Network Scanning Orchestration Engine             │
└─────────────────────────────────────────────────────────────┘
                            │
                ┌───────────┼───────────┐
                │           │           │
        ┌───────▼──┐   ┌────▼────┐  ┌──▼──────┐
        │ masscan  │   │ arp-scan│  │ nbtscan │
        │ (ports)  │   │  (L2)   │  │(NetBIOS)│
        └───────┬──┘   └────┬────┘  └──┬──────┘
                │           │           │
                └───────────┼───────────┘
                            │
                    ┌───────▼────────┐
                    │      nmap      │
                    │  (services)    │
                    └───────┬────────┘
                            │
                    ┌───────▼────────┐
                    │     httpx      │
                    │  (HTTP probe)  │
                    └───────┬────────┘
                            │
                ┌───────────┼───────────┐
                │           │           │
        ┌───────▼──┐   ┌────▼────┐  ┌──▼──────┐
        │  nuclei  │   │testssl  │  │gowitness│
        │  (vulns) │   │  (TLS)  │  │(screens)│
        └───────┬──┘   └────┬────┘  └──┬──────┘
                │           │           │
                └───────────┼───────────┘
                            │
              ┌───────────▼───────────┐
              │   normalize + merge   │
              │  sensor-output NDJSON │
              │       + CSV           │
              └───────────────────────┘

Design Principles:

Speed-first - Masscan can scan entire Class B in seconds
Containerized - All tools isolated, easy deployment
Timestamped - Historical tracking built-in
Network-aware - Runs in host network mode for raw packet access
Fail-safe - Tool failures don't break the pipeline
Re-runnable - discover runs on its own, and merge re-normalizes any existing run

Use Cases

Internal Security Assessment

# Quarterly internal vulnerability scan
./showctl run weekly
# Review findings in data/out/[timestamp]/findings_summary.csv

Network Inventory & Asset Discovery

# Discover what's actually on your network
./showctl run daily
# Import nmap.xml into your CMDB

Breach & Attack Simulation (BAS)

# Simulate attacker reconnaissance post-compromise
./showctl run daily
# Identify lateral movement paths

Continuous Security Monitoring

# crontab of a user in the docker group. cron's default PATH lacks /usr/local/bin (where yq usually lives).
PATH=/usr/local/bin:/usr/bin:/bin
SHOW_AUTHORIZED_BY="Security team / standing approval"

# Daily cron job for change detection
0 2 * * * cd /path/to/show && ./showctl run daily

# Weekly sweep (full ports, medium severity)
0 3 * * 0 cd /path/to/show && ./showctl run weekly

Penetration Testing

# Initial foothold → network mapping
./showctl run daily
# Feed results into exploitation frameworks

Compliance Scanning

# PCI DSS quarterly scans
./showctl run weekly
# Generate reports from findings_summary.csv

Performance Tuning

Masscan Rate Limiting

Default: 10,000 packets/second

scan:
  masscan:
    rate: 5000   # Conservative (avoid triggering IDS)
    rate: 10000  # Balanced (default)
    rate: 50000  # Aggressive (use with caution)

Network impact:

5,000 pps = ~5 Mbps
10,000 pps = ~10 Mbps
50,000 pps = ~50 Mbps

Nmap Timing

scan:
  nmap:
    timing: T2  # Polite (slower, stealthier)
    timing: T3  # Normal
    timing: T4  # Aggressive (default)
    timing: T5  # Insane (very loud, very fast)

Scope Management

Scan specific ports only:

scan:
  masscan:
    ports: "80,443,22,3389,445,3306,5432"

Full port scan (weekly sweep):

scan:
  masscan:
    full_ports: "0-65535"  # all 65,535 ports; used by `run weekly`

Data Formats

NDJSON (Machine-Readable)

# Find all critical vulnerabilities
jq 'select(.severity=="critical")' data/out/*/findings.ndjson

# List web services by technology (tech is a list of {name, version, category, confidence})
jq 'select(any(.tech[]?; .name|test("apache";"i")))' data/out/*/web_assets.ndjson

# Count services by port
jq -r 'select(.message|not) | .port' data/out/*/services.ndjson | sort | uniq -c | sort -rn

# Extract all IPs with port 445 open (SMB)
jq -r 'select(.port==445) | .ip_at_observation_time' data/out/*/services.ndjson

A stream with no records holds a single placeholder line that carries only a message field; select(.message|not) skips it.

CSV (Analysis-Ready)

Import into Excel, Splunk, or any analysis tool:

findings_summary.csv    - Vulnerability summary
web_assets.csv          - HTTP/HTTPS services
open_ports.csv          - Open services (ip, port, protocol, service, product, version)
hosts.csv               - Hosts (ip, mac, netbios, os, is_private)
tls.csv                 - TLS certificates
hosts_ports.txt         - Simple host:port list

Advanced Usage

Scanning Multiple Subnets

# data/in/subnets.txt
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

Excluding Hosts

To skip all RFC 1918 ranges (10/8, 172.16/12, 192.168/16), set scan.masscan.exclude_private: true in show.yaml.

SHOW has no setting for excluding individual hosts. The simplest way is to leave them out of data/in/subnets.txt by listing the remaining ranges. Otherwise, add masscan's --excludefile to the masscan call in showctl's discover(). masscan runs in the discovery container, which mounts ./data at /data:

cat > data/in/exclude.txt <<EOF
10.0.1.1
10.0.1.254
EOF

# in showctl discover(), add to the masscan arguments:
#   --excludefile /data/in/exclude.txt

Authenticated Nmap Scanning

For quick Windows enumeration you can add NSE scripts to the nmap step. Note that credentials passed as --script-args are visible in the process list (ps) — for real authenticated assessment use the separate EXPOSE module, not SHOW.

# Illustrative — add to the nmap command in showctl
compose run --rm nmap nmap \
  --script smb-enum-shares,smb-enum-users \
  --script-args smbusername=scanner,smbpassword='***' \
  -iL /data/out/$TS/hosts_alive.txt

Authenticated / deep vulnerability assessment → EXPOSE

SHOW is unauthenticated-only and runs no deep vulnerability scanner. Authenticated, credentialed deep assessment (OpenVAS/Greenbone or another engine) lives in the separate EXPOSE module, which consumes SHOW's discovered host list and emits findings in the same sensor-output contract. See the EXPOSE technical reference.

Network Requirements

Firewall Rules

SHOW needs to send and receive traffic on:

TCP, every port in the masscan spec - masscan SYN sweep, then nmap / httpx / nuclei / testssl / gowitness against the ports it found open (run weekly sweeps all 65,535)
UDP 137 - nbtscan NetBIOS name queries (if enabled)
ARP, local segment only - arp-scan MAC enrichment (if enabled)

SHOW does no ICMP host discovery: masscan finds hosts by their open ports, and nmap runs with -Pn.

Recommended Deployment

Option 1: Scanning Appliance

Dedicated VM/physical host
Bridge or promiscuous mode networking
Access to all VLANs you want to scan

Option 2: Jump Box

Deploy on existing admin/security segment
Ensure routing to target networks
May need firewall exceptions

Option 3: Cloud/Hybrid

VPN into target network
Be aware of bandwidth costs
Consider rate limiting

Comparison to Alternatives

Feature	SHOW	Nessus	OpenVAS	Rapid7	Nmap Alone
Cost	Free	$$$$	Free	$$$$	Free
Setup	< 5 min	~30 min	~1 hour	Cloud/days	< 1 min
Speed	Very Fast	Medium	Slow	Medium	Fast
Automation	Full	Partial	Manual	Full	Manual/scripted
Visual Recon	✓	✗	✗	✗	✗
Vulnerability DB	Templates	Commercial	Free	Commercial	NSE scripts
Reporting	CSV/JSON	PDF/HTML	PDF	Dashboard	Text/XML
Learning Curve	Low	Medium	High	Medium	Low
Enterprise Support	Community	✓	✗	✓	Community

Troubleshooting

"permission denied … docker.sock"

Your user can't reach the Docker daemon. Add it to the docker group (then log out and back in), or run with sudo:

sudo usermod -aG docker "$USER"

"Operation not permitted" during masscan

The compose file already grants the scanning containers NET_RAW / NET_ADMIN. This error usually means those capabilities can't take effect: rootless Docker, or a Docker host that isn't native Linux (Docker Desktop). Use rootful Docker Engine on a Linux host or VM.

masscan can't pick an interface

# Force the interface via env (no code edit needed); also used by arp-scan
SHOW_IFACE=eth0 ./showctl run daily
# with sudo, keep the variable: sudo SHOW_IFACE=eth0 ./showctl run daily

Masscan finds nothing

# Test manually (masscan lives in the 'discovery' service)
docker compose -f docker-compose.show.yml run --rm discovery \
  masscan -p80,443,22 192.168.1.0/24

# Check if you can reach targets
ping 192.168.1.1

Nmap very slow

# Adjust timing in show.yaml
scan:
  nmap:
    timing: T5  # Faster but noisier

Missing yq or jq

# Install yq
wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 \
  -O /usr/local/bin/yq && chmod +x /usr/local/bin/yq

# jq usually available via package manager
sudo apt install jq  # Debian/Ubuntu
sudo yum install jq  # RHEL/CentOS
brew install jq      # macOS

Security Considerations

Legal & Ethical Use

⚠️ WARNING: Network scanning can be disruptive and may be illegal without authorization.

Only scan networks you own or have explicit written permission to test
Obtain approval from IT/Security teams
Coordinate with network operations to avoid triggering IDS/IPS
Consider impact on production systems
Follow your organization's security policies

Rate Limiting

High-speed scanning can:

Saturate network links
Trigger IDS/IPS alerts
Crash legacy devices (printers, IoT)
Impact application performance

Start conservative, increase carefully.

Data Handling

Scan results may contain:

Sensitive host information
Vulnerability details
Service banners with version info
Screenshots of internal applications

Store securely, restrict access, encrypt at rest.

Roadmap

Testing

SHOW ships with a layered test suite under tests/ — bash-only, no external test framework. Run it with:

tests/run.sh                        # layers 1–4 (integration is opt-in)
tests/run.sh 20                     # only the layer(s) whose name contains '20'
SHOW_INTEGRATION=1 tests/run.sh 50  # + real-container integration (needs Docker)

Exit code is non-zero if any layer fails.

Layer	File	What it proves	Docker
1	`10_static.sh`	`bash -n` / `py_compile` / shellcheck, plus grep-guards that lock in each regression below	config check only
2	`20_parsers.sh`	Sources `showctl`'s real `sh_*` transforms + `config_check` / `latest_run` / `manifest`, then runs the `normalize.py` units	no
3	`30_golden.sh`	`normalize.py` over recorded tool output matches `tests/golden/` byte-for-byte	no (host `python3`)
4	`40_contracts.sh`	The container images accept the exact flags `showctl` passes them (catches upstream image drift)	yes
5	`50_integration.sh`	The real `showctl merge` path — crun wrapper + normalize + scan_id derivation — over recorded output (opt-in)	yes

The static and parser layers lock in the specific fixes the reviews surfaced, including:

Orchestration — crun runs -T </dev/null and always names a service; nmap uses -Pn + a dedicated -6 pass; nuclei scans live_urls.txt, never the raw sweep; IPv6 host:port is bracketed; SHOW_TEST_MODE keeps sourcing side-effect-free.
Run selection — latest_run picks the newest non-empty dir by name (never by mtime); merge drops the empty startup dir first and derives scan_id from the run-dir timestamp.
Degraded runs — a primary-tool failure or malformed tool output (bad JSONL, non-object rows, corrupt nmap XML, unusable testssl.json) is recorded as status:"degraded" + degraded_tools[] and never read as a clean empty scan; discover / merge signal it via exit code; the .normalize_degraded sidecar clears on a clean re-run.
Input hygiene — URL lists require a host and reject junk (^https?://…\S*$); the observed IP is derived safely (host_from_httpx, never carrying a port); IPv6 is bracketed in the TLS matched_at; nmap emits open ports only; screenshot paths are normalized.
Config & images — config_check validates every tunable knob (rates, timing, version_intensity, nuclei severity tokens, TCP-only port specs) with no dead show.yaml knob; amd64 images are platform-pinned.

Fixtures under tests/fixtures/ use synthetic hosts only (RFC 1918 / RFC 3849 ranges); regenerate the golden baselines with tests/regen_golden.sh after an intentional normalize.py change, then review the diff. See tests/README.md for details.

Run the suite with bash, not sh/zsh — showctl is bash and the suite sources it for its functions.

Contributing

Contributions welcome! Areas where we'd love help:

IPv6 live-network validation
Report generation templates
Additional tool integrations (BloodHound, CrackMapExec)
Performance optimization
Documentation improvements

To contribute:

Fork the repository
Create a feature branch (git checkout -b feature/awesome-feature)
Make your change and run the test suite (tests/run.sh) — add or update tests under tests/
Commit your changes (git commit -m 'Add awesome feature')
Push to the branch (git push origin feature/awesome-feature)
Open a Pull Request

FAQ

Q: Does SHOW need sudo/root?
A: Only for Docker access. masscan and nmap need raw sockets (CAP_NET_RAW), and docker-compose.show.yml grants that to their containers. A user in the docker group can run SHOW without sudo.

Q: Can I run this on Windows?
A: Use a Linux VM with a bridged network adapter. Docker Desktop (including its WSL2 backend) runs containers in its own VM, so network_mode: host doesn't put the scanners on your LAN. Under WSL2's default NAT networking, arp-scan can't see your local segment either.

Q: How is this different from STRIP?
A: STRIP = external/internet reconnaissance. SHOW = internal/network reconnaissance. They complement each other.

Q: Does SHOW generate reports?
A: Currently outputs CSV/JSON/NDJSON. HTML/PDF report generation is on the roadmap. You can import CSV into Excel/BI tools.

Q: Can I run daily/weekly simultaneously?
A: Not recommended. They'll create separate timestamped outputs but may compete for network resources.

Q: How do I scan through a VPN?
A: SHOW works over VPN. Just ensure your VPN routes to target subnets and allows raw packets.

Q: What about IPv6?
A: Handled through the scan chain — IPv6 addresses/CIDRs are swept by masscan, bracketed in host:port and URLs, given a separate nmap -6 pass (nmap6.xml), and hostnames resolve both A and AAAA. Fixture-verified, but not yet exercised against a live IPv6 network — confirm in your environment before relying on it.

Q: Where did authenticated / deep vulnerability scanning go?
A: SHOW is unauthenticated-only. Authenticated, credentialed deep assessment (OpenVAS/Greenbone) is a separate module, EXPOSE, which consumes SHOW's host list and emits findings in the same sensor-output contract.

License

MIT License - see LICENSE file for details.

Acknowledgments

SHOW stands on the shoulders of giants. Huge thanks to:

Robert David Graham - masscan
Gordon Lyon (Fyodor) - nmap
ProjectDiscovery - httpx, nuclei
testssl.sh team - TLS testing
gowitness - Screenshot tool

And the entire open-source security community.

Support

Issues: GitHub Issues
Discussions: GitHub Discussions
Documentation: Wiki

Related Projects

STRIP - External attack surface reconnaissance (companion tool)

Built for network defenders

Name		Name	Last commit message	Last commit date
assets		assets
data/in		data/in
docker/discovery		docker/discovery
scripts		scripts
tests		tests
.gitattributes		.gitattributes
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
docker-compose.show.yml		docker-compose.show.yml
show.yaml		show.yaml
showctl		showctl

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