# Feedser CERT-Bund Connector Operations

_Last updated: 2025-10-15_

Germany’s Federal Office for Information Security (BSI) operates the Warn- und Informationsdienst (WID) portal. The Feedser CERT-Bund connector (`source:cert-bund:*`) ingests the public RSS feed, hydrates the portal’s JSON detail endpoint, and maps the result into canonical advisories while preserving the original German content.

---

## 1. Configuration Checklist

- Allow outbound access (or stage mirrors) for:
  - `https://wid.cert-bund.de/content/public/securityAdvisory/rss`
  - `https://wid.cert-bund.de/portal/` (session/bootstrap)
  - `https://wid.cert-bund.de/portal/api/securityadvisory` (detail/search/export JSON)
- Ensure the HTTP client reuses a cookie container (the connector’s dependency injection wiring already sets this up).

Example `feedser.yaml` fragment:

```yaml
feedser:
  sources:
    cert-bund:
      feedUri: "https://wid.cert-bund.de/content/public/securityAdvisory/rss"
      portalBootstrapUri: "https://wid.cert-bund.de/portal/"
      detailApiUri: "https://wid.cert-bund.de/portal/api/securityadvisory"
      maxAdvisoriesPerFetch: 50
      maxKnownAdvisories: 512
      requestTimeout: "00:00:30"
      requestDelay: "00:00:00.250"
      failureBackoff: "00:05:00"
```

> Leave `maxAdvisoriesPerFetch` at 50 during normal operation. Raise it only for controlled backfills, then restore the default to avoid overwhelming the portal.

---

## 2. Telemetry & Logging

- **Meter**: `StellaOps.Feedser.Source.CertBund`
- **Counters / histograms**:
  - `certbund.feed.fetch.attempts|success|failures`
  - `certbund.feed.items.count`
  - `certbund.feed.enqueued.count`
  - `certbund.feed.coverage.days`
  - `certbund.detail.fetch.attempts|success|not_modified|failures{reason}`
  - `certbund.parse.success|failures{reason}`
  - `certbund.parse.products.count`, `certbund.parse.cve.count`
  - `certbund.map.success|failures{reason}`
  - `certbund.map.affected.count`, `certbund.map.aliases.count`
- Shared HTTP metrics remain available through `feedser.source.http.*`.

**Structured logs** (all emitted at information level when work occurs):

- `CERT-Bund fetch cycle: … truncated {Truncated}, coverageDays={CoverageDays}`
- `CERT-Bund parse cycle: parsed {Parsed}, failures {Failures}, …`
- `CERT-Bund map cycle: mapped {Mapped}, failures {Failures}, …`

Alerting ideas:

1. `increase(certbund.detail.fetch.failures_total[10m]) > 0`
2. `rate(certbund.map.success_total[30m]) == 0`
3. `histogram_quantile(0.95, rate(feedser_source_http_duration_bucket{feedser_source="cert-bund"}[15m])) > 5s`

The WebService now registers the meter so metrics surface automatically once OpenTelemetry metrics are enabled.

---

## 3. Historical Backfill & Export Strategy

### 3.1 Retention snapshot

- RSS window: ~250 advisories (≈90 days at current cadence).
- Older advisories are accessible through the JSON search/export APIs once the anti-CSRF token is supplied.

### 3.2 JSON search pagination

```bash
# 1. Bootstrap cookies (client_config + XSRF-TOKEN)
curl -s -c cookies.txt "https://wid.cert-bund.de/portal/" > /dev/null
curl -s -b cookies.txt -c cookies.txt \
     -H "X-Requested-With: XMLHttpRequest" \
     "https://wid.cert-bund.de/portal/api/security/csrf" > /dev/null

XSRF=$(awk '/XSRF-TOKEN/ {print $7}' cookies.txt)

# 2. Page search results
curl -s -b cookies.txt \
     -H "Content-Type: application/json" \
     -H "Accept: application/json" \
     -H "X-XSRF-TOKEN: ${XSRF}" \
     -X POST \
     --data '{"page":4,"size":100,"sort":["published,desc"]}' \
     "https://wid.cert-bund.de/portal/api/securityadvisory/search" \
     > certbund-page4.json
```

Iterate `page` until the response `content` array is empty. Pages 0–9 currently cover 2014→present. Persist JSON responses (plus SHA256) for Offline Kit parity.

### 3.3 Export bundles

```bash
curl -s -b cookies.txt \
     -H "Accept: application/json" \
     -H "X-XSRF-TOKEN: ${XSRF}" \
     "https://wid.cert-bund.de/portal/api/securityadvisory/export?format=json&from=2020-01-01" \
     > certbund-2020-2025.json
```

Split long ranges per year and record provenance (`from`, `to`, SHA, capturedAt). Feedser can ingest these JSON payloads directly when operating offline.
Task `FEEDCONN-CERTBUND-02-009` tracks turning this workflow into a shipped Offline Kit artefact with manifests and documentation updates—coordinate with the Docs guild before publishing.

### 3.4 Connector-driven catch-up

1. Temporarily raise `maxAdvisoriesPerFetch` (e.g. 150) and reduce `requestDelay`.
2. Run `stella db jobs run source:cert-bund:fetch --and-then source:cert-bund:parse --and-then source:cert-bund:map` until the fetch log reports `enqueued=0`.
3. Restore defaults and capture the cursor snapshot for audit.

---

## 4. Locale & Translation Guidance

- Advisories remain in German (`language: "de"`). Preserve wording for provenance and legal accuracy.
- UI localisation: enable the translation bundles documented in `docs/15_UI_GUIDE.md` if English UI copy is required. Operators can overlay machine or human translations, but the canonical database stores the source text.
- Docs guild is compiling a CERT-Bund terminology glossary under `docs/locale/certbund-glossary.md` so downstream teams can reference consistent English equivalents without altering the stored advisories.

---

## 5. Verification Checklist

1. Observe `certbund.feed.fetch.success` and `certbund.detail.fetch.success` increments after runs; `certbund.feed.coverage.days` should hover near the observed RSS window.
2. Ensure summary logs report `truncated=false` in steady state—`true` indicates the fetch cap was hit.
3. During backfills, watch `certbund.feed.enqueued.count` trend to zero.
4. Spot-check stored advisories in Mongo to confirm `language="de"` and reference URLs match the portal detail endpoint.
5. For Offline Kit exports, validate SHA256 hashes before distribution.
