/security-ownership-map

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. Use 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 use for general maintainer lists, non-security ownership questions, or threat modeling (use security-threat-model).'
metadata:
  author: github.com/openai/skills
  version: '1.0.0'

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:

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:

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:

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):

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:

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)
• `ownership.graphml` / `cochange.graphml` (optional, if `--graphml`)

`people.csv` includes timezone detection based on author commit offsets: `primary_tz_offset`, `primary_tz_minutes`, and `timezone_offsets`.

LLM query helper

Use `scripts/query_ownership.py` to return small, JSON-bounded slices without loading the full graph into context.

Examples:

python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out people --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out files --tag auth --bus-factor-max 1
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out person --person alice@corp --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out file --file crypto/tls
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out cochange --file crypto/tls --limit 10
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section orphaned_sensitive_code
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out community --id 3

Use `--community-top-owners 5` (default) to control how many maintainers are stored per community.

Basic security queries

Run these to answer common security ownership questions with bounded output:

# Orphaned sensitive code (stale + low bus factor)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section orphaned_sensitive_code

# Hidden owners for sensitive tags
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section hidden_owners

# Sensitive hotspots with low bus factor
python