security-ownership-map

The saved excerpt is a snapshot from when this skill was listed. The external source remains the complete and most current version.

---
name: "security-ownership-map"
description: "Analyze git repositories to build a security ownership topology (people-to-file), compute bus factor and sensitive-code ownership, and export CSV/JSON for graph databases and visualization. Trigger only when the user explicitly wants a security-oriented ownership or bus-factor analysis grounded in git history (for example: orphaned sensitive code, security maintainers, CODEOWNERS reality checks for risk, sensitive hotspots, or ownership clusters). Do not trigger for general maintainer lists or non-security ownership questions."
---

# Security Ownership Map

## Overview

Build a bipartite graph of people and files from git history, then compute ownership risk and export graph artifacts for Neo4j/Gephi. Also build a file co-change graph (Jaccard similarity on shared commits) to cluster files by how they move together while ignoring large, noisy commits.

## Requirements

- Python 3
- `networkx` (required; community detection is enabled by default)

Install with:

```bash
pip install networkx
```

## Workflow

1. Scope the repo and time window (optional `--since/--until`).
2. Decide sensitivity rules (use defaults or provide a CSV config).
3. Build the ownership map with `scripts/run_ownership_map.py` (co-change graph is on by default; use `--cochange-max-files` to ignore supernode commits).
4. Communities are computed by default; graphml output is optional (`--graphml`).
5. Query the outputs with `scripts/query_ownership.py` for bounded JSON slices.
6. Persist and visualize (see `references/neo4j-import.md`).

By default, the co-change graph ignores common “glue” files (lockfiles, `.github/*`, editor config) so clusters reflect actual code movement instead of shared infra edits. Override with `--cochange-exclude` or `--no-default-cochange-excludes`. Dependabot commits are excluded by default; override with `--no-default-author-excludes` or add patterns via `--author-exclude-regex`.

If you want to exclude Linux build glue like `Kbuild` from co-change clustering, pass:

```bash
python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo /path/to/linux \
  --out ownership-map-out \
  --cochange-exclude "**/Kbuild"
```

## Quick start

Run from the repo root:

```bash
python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --since "12 months ago" \
  --emit-commits
```

Defaults: author identity, author date, and merge commits excluded. Use `--identity committer`, `--date-field committer`, or `--include-merges` if needed.

Example (override co-change excludes):

```bash
python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --cochange-exclude "**/Cargo.lock" \
  --cochange-exclude "**/.github/**" \
  --no-default-cochange-excludes
```

Communities are computed by default. To disable:

```bash
python skills/skills/security-ownership-map/scripts/run_ownership_map.py \
  --repo . \
  --out ownership-map-out \
  --no-communities
```

## Sensitivity rules

By default, the script flags common auth/crypto/secret paths. Override by providing a CSV file:

```
# pattern,tag,weight
**/auth/**,auth,1.0
**/crypto/**,crypto,1.0
**/*.pem,secrets,1.0
```

Use it with `--sensitive-config path/to/sensitive.csv`.

## Output artifacts

`ownership-map-out/` contains:

- `people.csv` (nodes: people)
- `files.csv` (nodes: files)
- `edges.csv` (edges: touches)
- `cochange_edges.csv` (file-to-file co-change edges with Jaccard weight; omitted with `--no-cochange`)
- `summary.json` (security ownership findings)
- `commits.jsonl` (optional, if `--emit-commits`)
- `communities.json` (computed by default from co-change edges when available; includes `maintainers` per community; disable with `--no-communities`)
- `cochange.graph.json` (NetworkX node-link JSON with `community_id` + `community_maintainers`; falls back to `ownership.graph.json` if no co-change edges)
-