cnsl 3.4.3

Correlated Network Security Layer — A self-hosted SIEM for Linux

CNSL

Correlated Network Security Layer

A self-hosted SIEM for Linux.
Detects attacks that span SSH, web, database, and cloud logs simultaneously -- then blocks them automatically.

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What it does

Most tools watch one log and count failures. CNSL watches everything at once.

When an attacker scans your web server, probes your database, then tries SSH with stolen credentials -- CNSL sees all three as one coordinated attack and responds before the breach completes.

Web scan      from 45.33.32.1  --+
SSH brute     from 45.33.32.1  --+--->  HIGH alert + auto-block
DB auth fail  from 45.33.32.1  --+

It also tracks how far each attacker has progressed through the kill chain, learns new attack patterns automatically, and shares threat intelligence across multiple servers in real time.

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Quick start

pip install cnsl[full]
sudo python -m cnsl --dashboard --no-tcpdump
# Open http://127.0.0.1:8765
# Default login: admin / cnsl-change-me

Or from source:

git clone https://github.com/rahadbhuiya/cnsl.git
cd cnsl
python3 -m venv venv && source venv/bin/activate
pip install -e ".[full]"
sudo venv/bin/python -m cnsl --dashboard --no-tcpdump

Start in dry-run mode (default) -- no real blocks until you add --execute.

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Dashboard

Enable with --dashboard. Runs at http://127.0.0.1:8765.

Tabs: Overview, Incidents, Blocks, Live Feed, Kill Chain, Graph, Cases, UEBA, ML, Honeypot, FIM, Rules, Rate Limit, Settings.

For remote access use an SSH tunnel:

ssh -L 8765:127.0.0.1:8765 user@yourserver

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Configuration

Copy and edit the example config:

cp config/config.example.json /etc/cnsl/config.json

All options are documented in docs/configuration.md.
Key sections: thresholds, actions, dashboard, notifications, redis, cloud_identity, zero_trust, siem, federation.

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Documentation

Document	What it covers
docs/installation.md	Full install, systemd, Docker
docs/configuration.md	Every config option explained
docs/features.md	Complete feature list
docs/architecture.md	Module structure and design
docs/kill-chain.md	Kill chain tracker
docs/federation.md	Multi-node setup
docs/cloud-identity.md	AWS + Azure AD integration
docs/zero-trust.md	Trust score engine
docs/siem-connectors.md	Splunk, Sentinel, Webhook push
docs/pattern-learning.md	Automated rule discovery
docs/api.md	Full REST API reference
docs/ot-iot.md	OT/ICS protocol support (Modbus, DNP3, SCADA)
docs/changelog.md	Version history
docs/	All documentation (26 guides)

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Requirements

• Linux (Ubuntu 20.04+ / Debian 11+ / RHEL 8+)
• Python 3.10+
• Root or CAP_NET_ADMIN for iptables blocking

Optional: Redis (distributed blocklist + federation), MaxMind GeoIP database.

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License

MIT. See LICENSE.