Security Ownership Map

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

• Scope the repo and time window (optional `--since/--until`).
• Decide sensitivity rules (use defaults or provide a CSV config).
• 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).
• Communities are computed by default; graphml output is optional (`--graphml`).
• Query the outputs with `scripts/query_ownership.py` for bounded JSON slices.
• 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 skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out summary --section bus_factor_hotspots

# Auth/crypto files with bus factor <= 1
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 files --tag crypto --bus-factor-max 1

# Who is touching sensitive code the most
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out people --sort sensitive_touches --limit 10

# Co-change neighbors (cluster hints for ownership drift)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out cochange --file path/to/file --min-jaccard 0.05 --limit 20

# Community maintainers (for a cluster)
python skills/skills/security-ownership-map/scripts/query_ownership.py --data-dir ownership-map-out community --id 3

# Monthly maintainers for the community containing a file
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
  --data-dir ownership-map-out \
  --file network/card.c \
  --since 2025-01-01 \
  --top 5

# Quarterly buckets instead of monthly
python skills/skills/security-ownership-map/scripts/community_maintainers.py \
  --data-dir ownership-map-out \
  --file network/card.c \
  --since 2025-01-01 \
  --bucket quarter \
  --top 5

Notes:

• Touches default to one authored commit (not per-file). Use `--touch-mode file` to count per-file touches.
• Use `--window-days 90` or `--weight recency --half-life-days 180` to smooth churn.
• Filter bots with `--ignore-author-regex '(bot|dependabot)'`.
• Use `--min-share 0.1` to show stable maintainers only.
• Use `--bucket quarter` for calendar quarter groupings.
• Use `--identity committer` or `--date-field committer` to switch from author attribution.
• Use `--include-merges` to include merge commits (excluded by default).

Summary format (default)

Use this structure, add fields if needed:

{
  "orphaned_sensitive_code": [
    {
      "path": "crypto/tls/handshake.rs",
      "last_security_touch": "2023-03-12T18:10:04+00:00",
      "bus_factor": 1
    }
  ],
  "hidden_owners": [
    {
      "person": "alice@corp",
      "controls": "63% of auth code"
    }
  ]
}

Graph persistence

Use `references/neo4j-import.md` when you need to load the CSVs into Neo4j. It includes constraints, import Cypher, and visualization tips.

Notes

• `bus_factor_hotspots` in `summary.json` lists sensitive files with low bus factor; `orphaned_sensitive_code` is the stale subset.
• If `git log` is too large, narrow with `--since` or `--until`.
• Compare `summary.json` against CODEOWNERS to highlight ownership drift.