netaudit

CI-native network egress auditing via strace. Wrap any process or test suite, declare what connections are allowed, get pass/fail — no raw strace noise.

Install

pip install netaudit

Requires strace (Linux only):

sudo apt-get install strace   # Debian/Ubuntu
sudo dnf install strace       # RHEL/Fedora

Or use the Docker image — strace is pre-installed.

Quick start

1. Create netaudit.yaml in your project root:

version: 1
allowlist:
  - name: "Internal API"
    family: AF_INET
    addr: 10.0.0.1
    port: 8080

2. Run:

# Trace any command and fail on unexpected connections
netaudit run -- pytest
netaudit run -- curl https://example.com
netaudit run -- ./my-service --port 8080

# Show all network calls annotated with the matching rule name
# Everything after -- is the wrapped command
netaudit run --verbose -- pytest tests/

# Offline analysis of an existing strace log
netaudit analyze /tmp/trace.log

# Machine-readable output for CI artifacts
netaudit run --format json -- make test

Exit codes: 0 clean · 1 violations · 2 strace not found

pytest plugin

Enable automatic auditing of your test suite without changing any test code:

# pyproject.toml
[tool.netaudit]
enabled = true
allowlist = "netaudit.yaml"

pytest --netaudit                # fail session on violations
pytest --netaudit --netaudit-verbose  # show every connection per test

Violations are attributed to the individual test that triggered them.

Docker

No local strace install needed:

docker pull ghcr.io/cybersecauto-labs/netaudit:latest

docker run --rm --cap-add SYS_PTRACE \
  -v "$(pwd)/netaudit.yaml:/netaudit.yaml" \
  ghcr.io/cybersecauto-labs/netaudit \
  run --allowlist /netaudit.yaml -- curl https://example.com

Documentation

Full docs at netaudit.readthedocs.io:

• CLI Reference
• Allowlist DSL
• pytest Plugin
• Docker
• Architecture
• Contributing

How it works

netaudit run spawns your command under strace -e trace=connect -f -tt, parses every connect() syscall, and checks each against your allowlist. Built-in rules automatically permit loopback, Unix sockets, and AF_NETLINK — you only need to list external destinations.

Development

python3.11 -m venv .venv
.venv/bin/pip install -e ".[dev]"
.venv/bin/pytest

See Contributing for the full guide.