Resolve Concelier/Excititor merge conflicts
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# component_architecture_concelier.md — **Stella Ops Concelier** (2025Q4)
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> **Scope.** Implementation‑ready architecture for **Concelier**: the vulnerability ingest/normalize/merge/export subsystem that produces deterministic advisory data for the Scanner + Policy + Excititor pipeline. Covers domain model, connectors, merge rules, storage schema, exports, APIs, performance, security, and test matrices.
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---
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## 0) Mission & boundaries
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**Mission.** Acquire authoritative **vulnerability advisories** (vendor PSIRTs, distros, OSS ecosystems, CERTs), normalize them into a **canonical model**, reconcile aliases and version ranges, and export **deterministic artifacts** (JSON, Trivy DB) for fast backend joins.
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**Boundaries.**
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* Concelier **does not** sign with private keys. When attestation is required, the export artifact is handed to the **Signer**/**Attestor** pipeline (out‑of‑process).
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* Concelier **does not** decide PASS/FAIL; it provides data to the **Policy** engine.
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* Online operation is **allowlist‑only**; air‑gapped deployments use the **Offline Kit**.
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---
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## 1) Topology & processes
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**Process shape:** single ASP.NET Core service `StellaOps.Concelier.WebService` hosting:
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* **Scheduler** with distributed locks (Mongo backed).
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* **Connectors** (fetch/parse/map).
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* **Merger** (canonical record assembly + precedence).
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* **Exporters** (JSON, Trivy DB).
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* **Minimal REST** for health/status/trigger/export.
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**Scale:** HA by running N replicas; **locks** prevent overlapping jobs per source/exporter.
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---
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## 2) Canonical domain model
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> Stored in MongoDB (database `concelier`), serialized with a **canonical JSON** writer (stable order, camelCase, normalized timestamps).
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### 2.1 Core entities
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**Advisory**
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```
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advisoryId // internal GUID
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advisoryKey // stable string key (e.g., CVE-2025-12345 or vendor ID)
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title // short title (best-of from sources)
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summary // normalized summary (English; i18n optional)
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published // earliest source timestamp
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modified // latest source timestamp
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severity // normalized {none, low, medium, high, critical}
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cvss // {v2?, v3?, v4?} objects (vector, baseScore, severity, source)
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exploitKnown // bool (e.g., KEV/active exploitation flags)
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references[] // typed links (advisory, kb, patch, vendor, exploit, blog)
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sources[] // provenance for traceability (doc digests, URIs)
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```
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**Alias**
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```
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advisoryId
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scheme // CVE, GHSA, RHSA, DSA, USN, MSRC, etc.
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value // e.g., "CVE-2025-12345"
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```
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**Affected**
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```
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advisoryId
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productKey // canonical product identity (see 2.2)
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rangeKind // semver | evr | nvra | apk | rpm | deb | generic | exact
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introduced? // string (format depends on rangeKind)
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fixed? // string (format depends on rangeKind)
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lastKnownSafe? // optional explicit safe floor
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arch? // arch or platform qualifier if source declares (x86_64, aarch64)
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distro? // distro qualifier when applicable (rhel:9, debian:12, alpine:3.19)
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ecosystem? // npm|pypi|maven|nuget|golang|…
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notes? // normalized notes per source
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```
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**Reference**
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```
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advisoryId
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url
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kind // advisory | patch | kb | exploit | mitigation | blog | cvrf | csaf
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sourceTag // e.g., vendor/redhat, distro/debian, oss/ghsa
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```
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**MergeEvent**
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```
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advisoryKey
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beforeHash // canonical JSON hash before merge
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afterHash // canonical JSON hash after merge
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mergedAt
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inputs[] // source doc digests that contributed
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```
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**AdvisoryStatement (event log)**
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```
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statementId // GUID (immutable)
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vulnerabilityKey // canonical advisory key (e.g., CVE-2025-12345)
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advisoryKey // merge snapshot advisory key (may reference variant)
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statementHash // canonical hash of advisory payload
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asOf // timestamp of snapshot (UTC)
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recordedAt // persistence timestamp (UTC)
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inputDocuments[] // document IDs contributing to the snapshot
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payload // canonical advisory document (BSON / canonical JSON)
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```
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**AdvisoryConflict**
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```
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conflictId // GUID
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vulnerabilityKey // canonical advisory key
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conflictHash // deterministic hash of conflict payload
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asOf // timestamp aligned with originating statement set
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recordedAt // persistence timestamp
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statementIds[] // related advisoryStatement identifiers
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details // structured conflict explanation / merge reasoning
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```
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- `AdvisoryEventLog` (Concelier.Core) provides the public API for appending immutable statements/conflicts and querying replay history. Inputs are normalized by trimming and lower-casing `vulnerabilityKey`, serializing advisories with `CanonicalJsonSerializer`, and computing SHA-256 hashes (`statementHash`, `conflictHash`) over the canonical JSON payloads. Consumers can replay by key with an optional `asOf` filter to obtain deterministic snapshots ordered by `asOf` then `recordedAt`.
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- Concelier.WebService exposes the immutable log via `GET /concelier/advisories/{vulnerabilityKey}/replay[?asOf=UTC_ISO8601]`, returning the latest statements (with hex-encoded hashes) and any conflict explanations for downstream exporters and APIs.
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**ExportState**
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```
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exportKind // json | trivydb
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baseExportId? // last full baseline
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baseDigest? // digest of last full baseline
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lastFullDigest? // digest of last full export
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lastDeltaDigest? // digest of last delta export
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cursor // per-kind incremental cursor
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files[] // last manifest snapshot (path → sha256)
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```
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### 2.2 Product identity (`productKey`)
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* **Primary:** `purl` (Package URL).
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* **OS packages:** RPM (NEVRA→purl:rpm), DEB (dpkg→purl:deb), APK (apk→purl:alpine), with **EVR/NVRA** preserved.
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* **Secondary:** `cpe` retained for compatibility; advisory records may carry both.
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* **Image/platform:** `oci:<registry>/<repo>@<digest>` for image‑level advisories (rare).
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* **Unmappable:** if a source is non‑deterministic, keep native string under `productKey="native:<provider>:<id>"` and mark **non‑joinable**.
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---
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## 3) Source families & precedence
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### 3.1 Families
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* **Vendor PSIRTs**: Microsoft, Oracle, Cisco, Adobe, Apple, VMware, Chromium…
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* **Linux distros**: Red Hat, SUSE, Ubuntu, Debian, Alpine…
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* **OSS ecosystems**: OSV, GHSA (GitHub Security Advisories), PyPI, npm, Maven, NuGet, Go.
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* **CERTs / national CSIRTs**: CISA (KEV, ICS), JVN, ACSC, CCCS, KISA, CERT‑FR/BUND, etc.
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### 3.2 Precedence (when claims conflict)
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1. **Vendor PSIRT** (authoritative for their product).
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2. **Distro** (authoritative for packages they ship, including backports).
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3. **Ecosystem** (OSV/GHSA) for library semantics.
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4. **CERTs/aggregators** for enrichment (KEV/known exploited).
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> Precedence affects **Affected** ranges and **fixed** info; **severity** is normalized to the **maximum** credible severity unless policy overrides. Conflicts are retained with **source provenance**.
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---
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## 4) Connectors & normalization
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### 4.1 Connector contract
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```csharp
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public interface IFeedConnector {
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string SourceName { get; }
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Task FetchAsync(IServiceProvider sp, CancellationToken ct); // -> document collection
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Task ParseAsync(IServiceProvider sp, CancellationToken ct); // -> dto collection (validated)
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Task MapAsync(IServiceProvider sp, CancellationToken ct); // -> advisory/alias/affected/reference
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}
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```
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* **Fetch**: windowed (cursor), conditional GET (ETag/Last‑Modified), retry/backoff, rate limiting.
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* **Parse**: schema validation (JSON Schema, XSD/CSAF), content type checks; write **DTO** with normalized casing.
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* **Map**: build canonical records; all outputs carry **provenance** (doc digest, URI, anchors).
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### 4.2 Version range normalization
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* **SemVer** ecosystems (npm, pypi, maven, nuget, golang): normalize to `introduced`/`fixed` semver ranges (use `~`, `^`, `<`, `>=` canonicalized to intervals).
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* **RPM EVR**: `epoch:version-release` with `rpmvercmp` semantics; store raw EVR strings and also **computed order keys** for query.
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* **DEB**: dpkg version comparison semantics mirrored; store computed keys.
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* **APK**: Alpine version semantics; compute order keys.
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* **Generic**: if provider uses text, retain raw; do **not** invent ranges.
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### 4.3 Severity & CVSS
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* Normalize **CVSS v2/v3/v4** where available (vector, baseScore, severity).
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* If multiple CVSS sources exist, track them all; **effective severity** defaults to **max** by policy (configurable).
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* **ExploitKnown** toggled by KEV and equivalent sources; store **evidence** (source, date).
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---
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## 5) Merge engine
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### 5.1 Keying & identity
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* Identity graph: **CVE** is primary node; vendor/distro IDs resolved via **Alias** edges (from connectors and Concelier’s alias tables).
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* `advisoryKey` is the canonical primary key (CVE if present, else vendor/distro key).
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### 5.2 Merge algorithm (deterministic)
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1. **Gather** all rows for `advisoryKey` (across sources).
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2. **Select title/summary** by precedence source (vendor>distro>ecosystem>cert).
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3. **Union aliases** (dedupe by scheme+value).
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4. **Merge `Affected`** with rules:
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* Prefer **vendor** ranges for vendor products; prefer **distro** for **distro‑shipped** packages.
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* If both exist for same `productKey`, keep **both**; mark `sourceTag` and `precedence` so **Policy** can decide.
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* Never collapse range semantics across different families (e.g., rpm EVR vs semver).
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5. **CVSS/severity**: record all CVSS sets; compute **effectiveSeverity** = max (unless policy override).
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6. **References**: union with type precedence (advisory > patch > kb > exploit > blog); dedupe by URL; preserve `sourceTag`.
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7. Produce **canonical JSON**; compute **afterHash**; store **MergeEvent** with inputs and hashes.
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> The merge is **pure** given inputs. Any change in inputs or precedence matrices changes the **hash** predictably.
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---
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## 6) Storage schema (MongoDB)
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**Collections & indexes**
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* `source` `{_id, type, baseUrl, enabled, notes}`
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* `source_state` `{sourceName(unique), enabled, cursor, lastSuccess, backoffUntil, paceOverrides}`
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* `document` `{_id, sourceName, uri, fetchedAt, sha256, contentType, status, metadata, gridFsId?, etag?, lastModified?}`
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* Index: `{sourceName:1, uri:1}` unique, `{fetchedAt:-1}`
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* `dto` `{_id, sourceName, documentId, schemaVer, payload, validatedAt}`
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* Index: `{sourceName:1, documentId:1}`
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* `advisory` `{_id, advisoryKey, title, summary, published, modified, severity, cvss, exploitKnown, sources[]}`
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* Index: `{advisoryKey:1}` unique, `{modified:-1}`, `{severity:1}`, text index (title, summary)
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* `alias` `{advisoryId, scheme, value}`
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* Index: `{scheme:1,value:1}`, `{advisoryId:1}`
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* `affected` `{advisoryId, productKey, rangeKind, introduced?, fixed?, arch?, distro?, ecosystem?}`
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* Index: `{productKey:1}`, `{advisoryId:1}`, `{productKey:1, rangeKind:1}`
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* `reference` `{advisoryId, url, kind, sourceTag}`
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* Index: `{advisoryId:1}`, `{kind:1}`
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* `merge_event` `{advisoryKey, beforeHash, afterHash, mergedAt, inputs[]}`
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* Index: `{advisoryKey:1, mergedAt:-1}`
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* `export_state` `{_id(exportKind), baseExportId?, baseDigest?, lastFullDigest?, lastDeltaDigest?, cursor, files[]}`
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* `locks` `{_id(jobKey), holder, acquiredAt, heartbeatAt, leaseMs, ttlAt}` (TTL cleans dead locks)
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* `jobs` `{_id, type, args, state, startedAt, heartbeatAt, endedAt, error}`
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**GridFS buckets**: `fs.documents` for raw payloads.
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---
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## 7) Exporters
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### 7.1 Deterministic JSON (vuln‑list style)
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* Folder structure mirroring `/<scheme>/<first-two>/<rest>/…` with one JSON per advisory; deterministic ordering, stable timestamps, normalized whitespace.
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* `manifest.json` lists all files with SHA‑256 and a top‑level **export digest**.
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### 7.2 Trivy DB exporter
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* Builds Bolt DB archives compatible with Trivy; supports **full** and **delta** modes.
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* In delta, unchanged blobs are reused from the base; metadata captures:
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```
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{
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"mode": "delta|full",
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"baseExportId": "...",
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"baseManifestDigest": "sha256:...",
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"changed": ["path1", "path2"],
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"removed": ["path3"]
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}
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```
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* Optional ORAS push (OCI layout) for registries.
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* Offline kit bundles include Trivy DB + JSON tree + export manifest.
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* Mirror-ready bundles: when `concelier.trivy.mirror` defines domains, the exporter emits `mirror/index.json` plus per-domain `manifest.json`, `metadata.json`, and `db.tar.gz` files with SHA-256 digests so Concelier mirrors can expose domain-scoped download endpoints.
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### 7.3 Hand‑off to Signer/Attestor (optional)
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* On export completion, if `attest: true` is set in job args, Concelier **posts** the artifact metadata to **Signer**/**Attestor**; Concelier itself **does not** hold signing keys.
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* Export record stores returned `{ uuid, index, url }` from **Rekor v2**.
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---
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## 8) REST APIs
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All under `/api/v1/concelier`.
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**Health & status**
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```
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GET /healthz | /readyz
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GET /status → sources, last runs, export cursors
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```
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**Sources & jobs**
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```
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GET /sources → list of configured sources
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POST /sources/{name}/trigger → { jobId }
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POST /sources/{name}/pause | /resume → toggle
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GET /jobs/{id} → job status
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```
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**Exports**
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```
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POST /exports/json { full?:bool, force?:bool, attest?:bool } → { exportId, digest, rekor? }
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POST /exports/trivy { full?:bool, force?:bool, publish?:bool, attest?:bool } → { exportId, digest, rekor? }
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GET /exports/{id} → export metadata (kind, digest, createdAt, rekor?)
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GET /concelier/exports/index.json → mirror index describing available domains/bundles
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GET /concelier/exports/mirror/{domain}/manifest.json
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GET /concelier/exports/mirror/{domain}/bundle.json
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GET /concelier/exports/mirror/{domain}/bundle.json.jws
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```
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**Search (operator debugging)**
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```
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GET /advisories/{key}
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GET /advisories?scheme=CVE&value=CVE-2025-12345
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GET /affected?productKey=pkg:rpm/openssl&limit=100
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```
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**AuthN/Z:** Authority tokens (OpTok) with roles: `concelier.read`, `concelier.admin`, `concelier.export`.
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---
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## 9) Configuration (YAML)
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```yaml
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concelier:
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mongo: { uri: "mongodb://mongo/concelier" }
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s3:
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endpoint: "http://minio:9000"
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bucket: "stellaops-concelier"
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scheduler:
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windowSeconds: 30
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maxParallelSources: 4
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sources:
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- name: redhat
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kind: csaf
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baseUrl: https://access.redhat.com/security/data/csaf/v2/
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signature: { type: pgp, keys: [ "…redhat PGP…" ] }
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enabled: true
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windowDays: 7
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- name: suse
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kind: csaf
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baseUrl: https://ftp.suse.com/pub/projects/security/csaf/
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signature: { type: pgp, keys: [ "…suse PGP…" ] }
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- name: ubuntu
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kind: usn-json
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baseUrl: https://ubuntu.com/security/notices.json
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signature: { type: none }
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- name: osv
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kind: osv
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baseUrl: https://api.osv.dev/v1/
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signature: { type: none }
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- name: ghsa
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kind: ghsa
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baseUrl: https://api.github.com/graphql
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auth: { tokenRef: "env:GITHUB_TOKEN" }
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exporters:
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json:
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enabled: true
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output: s3://stellaops-concelier/json/
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trivy:
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enabled: true
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mode: full
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output: s3://stellaops-concelier/trivy/
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oras:
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enabled: false
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repo: ghcr.io/org/concelier
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precedence:
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vendorWinsOverDistro: true
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distroWinsOverOsv: true
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severity:
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policy: max # or 'vendorPreferred' / 'distroPreferred'
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```
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---
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## 10) Security & compliance
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* **Outbound allowlist** per connector (domains, protocols); proxy support; TLS pinning where possible.
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* **Signature verification** for raw docs (PGP/cosign/x509) with results stored in `document.metadata.sig`. Docs failing verification may still be ingested but flagged; **merge** can down‑weight or ignore them by config.
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* **No secrets in logs**; auth material via `env:` or mounted files; HTTP redaction of `Authorization` headers.
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* **Multi‑tenant**: per‑tenant DBs or prefixes; per‑tenant S3 prefixes; tenant‑scoped API tokens.
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* **Determinism**: canonical JSON writer; export digests stable across runs given same inputs.
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---
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## 11) Performance targets & scale
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* **Ingest**: ≥ 5k documents/min on 4 cores (CSAF/OpenVEX/JSON).
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* **Normalize/map**: ≥ 50k `Affected` rows/min on 4 cores.
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* **Merge**: ≤ 10 ms P95 per advisory at steady‑state updates.
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* **Export**: 1M advisories JSON in ≤ 90 s (streamed, zstd), Trivy DB in ≤ 60 s on 8 cores.
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* **Memory**: hard cap per job; chunked streaming writers; backpressure to avoid GC spikes.
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**Scale pattern**: add Concelier replicas; Mongo scaling via indices and read/write concerns; GridFS only for oversized docs.
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---
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## 12) Observability
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* **Metrics**
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* `concelier.fetch.docs_total{source}`
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* `concelier.fetch.bytes_total{source}`
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* `concelier.parse.failures_total{source}`
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* `concelier.map.affected_total{source}`
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* `concelier.merge.changed_total`
|
||||
* `concelier.export.bytes{kind}`
|
||||
* `concelier.export.duration_seconds{kind}`
|
||||
* **Tracing** around fetch/parse/map/merge/export.
|
||||
* **Logs**: structured with `source`, `uri`, `docDigest`, `advisoryKey`, `exportId`.
|
||||
|
||||
---
|
||||
|
||||
## 13) Testing matrix
|
||||
|
||||
* **Connectors:** fixture suites for each provider/format (happy path; malformed; signature fail).
|
||||
* **Version semantics:** EVR vs dpkg vs semver edge cases (epoch bumps, tilde versions, pre‑releases).
|
||||
* **Merge:** conflicting sources (vendor vs distro vs OSV); verify precedence & dual retention.
|
||||
* **Export determinism:** byte‑for‑byte stable outputs across runs; digest equality.
|
||||
* **Performance:** soak tests with 1M advisories; cap memory; verify backpressure.
|
||||
* **API:** pagination, filters, RBAC, error envelopes (RFC 7807).
|
||||
* **Offline kit:** bundle build & import correctness.
|
||||
|
||||
---
|
||||
|
||||
## 14) Failure modes & recovery
|
||||
|
||||
* **Source outages:** scheduler backs off with exponential delay; `source_state.backoffUntil`; alerts on staleness.
|
||||
* **Schema drifts:** parse stage marks DTO invalid; job fails with clear diagnostics; connector version flags track supported schema ranges.
|
||||
* **Partial exports:** exporters write to temp prefix; **manifest commit** is atomic; only then move to final prefix and update `export_state`.
|
||||
* **Resume:** all stages idempotent; `source_state.cursor` supports window resume.
|
||||
|
||||
---
|
||||
|
||||
## 15) Operator runbook (quick)
|
||||
|
||||
* **Trigger all sources:** `POST /api/v1/concelier/sources/*/trigger`
|
||||
* **Force full export JSON:** `POST /api/v1/concelier/exports/json { "full": true, "force": true }`
|
||||
* **Force Trivy DB delta publish:** `POST /api/v1/concelier/exports/trivy { "full": false, "publish": true }`
|
||||
* **Inspect advisory:** `GET /api/v1/concelier/advisories?scheme=CVE&value=CVE-2025-12345`
|
||||
* **Pause noisy source:** `POST /api/v1/concelier/sources/osv/pause`
|
||||
|
||||
---
|
||||
|
||||
## 16) Rollout plan
|
||||
|
||||
1. **MVP**: Red Hat (CSAF), SUSE (CSAF), Ubuntu (USN JSON), OSV; JSON export.
|
||||
2. **Add**: GHSA GraphQL, Debian (DSA HTML/JSON), Alpine secdb; Trivy DB export.
|
||||
3. **Attestation hand‑off**: integrate with **Signer/Attestor** (optional).
|
||||
4. **Scale & diagnostics**: provider dashboards, staleness alerts, export cache reuse.
|
||||
5. **Offline kit**: end‑to‑end verified bundles for air‑gap.
|
||||
|
||||
Reference in New Issue
Block a user