# bootstrap/sops — SOPS + age key material & decryption wiring (Phase 1, T-1.4)

Generates the age keypair, declares SOPS creation rules, and documents how the age **private** key
is installed into the cluster so Flux can decrypt SOPS at reconcile.
Spec: [ADR-0007 (SOPS+age)](../../../home-network-k3s/decisions/adr-0007-secrets-sops-age.md),
[docs/07](../../../home-network-k3s/docs/07-security-and-secrets.md) · Requirement: **R-SEC-01**
(secrets encrypted at rest in git, decrypted only in-cluster).

> **AUTHOR-ONLY. Nothing here has been executed. No key or secret material exists in this output.**
> No `age-keygen`, `sops`, or `kubectl` was run. The age keypair is generated later by the operator;
> `.sops.yaml` carries only a **placeholder** for the public recipient.

## Files
| File | Purpose |
|---|---|
| `age-keygen.sh` | Operator-run script: generates the age keypair to a path **outside the repo**, prints only the **public** recipient. **Refuses** to write inside the repo or clobber an existing key. |
| `.sops.yaml` | SOPS creation rules (encrypt only `data`/`stringData` → readable diffs). `age:` recipient is a clearly-marked `REPLACE-ME` placeholder filled at bootstrap. **Effective home is the repo root** (see below). |
| `age-key-secret.md` | Runbook + `kubectl create secret` template installing the age **private** key as the `sops-age` Secret in `flux-system` (the sanctioned out-of-band step). Rotation + DR custody included. |

## How this satisfies R-SEC-01 / ADR-0007
- Secrets are committed **encrypted** (`sops --encrypt`) using the age **public** recipient in
  `.sops.yaml`; plaintext never enters git (`.gitignore` guards `age.key`, `*.key`, `*.dec.yaml`).
- Flux decrypts **in-cluster** using the age **private** key held in the `sops-age` Secret — the one
  documented out-of-band bootstrap action (docs/07, ADR-0007 Consequences).
- `decryption.provider: sops` + `secretRef: sops-age` on the `platform`/`apps` Flux Kustomizations is
  wired by `../flux/patches/` (realising the commented TODOs in `clusters/base`).
- No key material appears in scripts, docs, PRs, or logs (AGENTS.md §5).

## Interface / handoff
- **`.sops.yaml` belongs at the REPOSITORY ROOT.** SOPS discovers it by walking up from the file
  being encrypted, so it only governs `platform/**` and `apps/**` from root. It is authored here (in
  this worker's subtree); the **PM/clusters owner installs it at the repo root** (copy or symlink).
  Flagged as an escalation in the T-1.4 report.
- **Fill two placeholders at bootstrap:** the `age:` recipient in `.sops.yaml` (from
  `age-keygen.sh`'s output) — same value in both creation rules.
- **Order** (see `../flux/README.md`): `age-keygen.sh` → install `sops-age` Secret (`age-key-secret.md`)
  → `../flux/bootstrap.sh`. The Flux entrypoint fails fast if the Secret is missing.