UI work to fill SBOM sourcing management gap. UI planning remaining functionality exposure. Work on CI/Tests stabilization
Introduces CGS determinism test runs to CI workflows for Windows, macOS, Linux, Alpine, and Debian, fulfilling CGS-008 cross-platform requirements. Updates local-ci scripts to support new smoke steps, test timeouts, progress intervals, and project slicing for improved test isolation and diagnostics.
This commit is contained in:
master
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src/__Libraries/StellaOps.Verdict/VerdictBuilderService.cs
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src/__Libraries/StellaOps.Verdict/VerdictBuilderService.cs
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// -----------------------------------------------------------------------------
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// VerdictBuilderService.cs
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// Sprint: SPRINT_20251229_001_001_BE_cgs_infrastructure (CGS-002, CGS-007)
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// Task: Implement VerdictBuilderService with optional Fulcio keyless signing
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// -----------------------------------------------------------------------------
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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using Microsoft.Extensions.Logging;
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using StellaOps.Signer.Core;
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namespace StellaOps.Verdict;
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/// <summary>
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/// Implementation of <see cref="IVerdictBuilder"/>.
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/// Builds deterministic verdicts with Canonical Graph Signature (CGS).
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/// Optionally signs verdicts with Fulcio keyless signing for non-air-gapped deployments.
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/// </summary>
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public sealed class VerdictBuilderService : IVerdictBuilder
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{
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private readonly ILogger<VerdictBuilderService> _logger;
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private readonly IDsseSigner? _signer;
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private static readonly JsonSerializerOptions CanonicalJsonOptions = new()
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{
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WriteIndented = false,
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull
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};
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/// <summary>
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/// Creates a VerdictBuilderService.
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/// </summary>
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/// <param name="logger">Logger instance</param>
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/// <param name="signer">Optional DSSE signer (e.g., KeylessDsseSigner for Fulcio). Null for air-gapped deployments.</param>
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public VerdictBuilderService(
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ILogger<VerdictBuilderService> logger,
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IDsseSigner? signer = null)
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{
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_logger = logger;
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_signer = signer;
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if (_signer == null)
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{
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_logger.LogInformation("VerdictBuilder initialized without signer (air-gapped mode)");
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}
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else
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{
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_logger.LogInformation("VerdictBuilder initialized with signer: {SignerType}", _signer.GetType().Name);
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}
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}
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public async ValueTask<CgsVerdictResult> BuildAsync(
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EvidencePack evidence,
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PolicyLock policyLock,
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CancellationToken ct = default)
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{
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// 1. Compute CGS hash from evidence pack (deterministic Merkle tree)
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var cgsHash = ComputeCgsHash(evidence, policyLock);
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// 2. Build proof trace
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var trace = BuildProofTrace(evidence, policyLock);
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// 3. Compute verdict payload (this would integrate with policy engine)
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var verdict = await ComputeVerdictPayloadAsync(evidence, policyLock, ct);
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// 4. Create DSSE envelope (signed if signer available, unsigned for air-gap)
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var dsse = await CreateDsseEnvelopeAsync(verdict, cgsHash, ct);
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// 5. Return verdict result
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var result = new CgsVerdictResult(
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CgsHash: cgsHash,
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Verdict: verdict,
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Dsse: dsse,
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Trace: trace,
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ComputedAt: DateTimeOffset.UtcNow
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);
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var signingMode = _signer != null ? "signed" : "unsigned (air-gap)";
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_logger.LogInformation(
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"Verdict built: cgs={CgsHash}, status={Status}, mode={Mode}",
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cgsHash,
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verdict.Status,
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signingMode);
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return result;
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}
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public async ValueTask<CgsVerdictResult?> ReplayAsync(
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string cgsHash,
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CancellationToken ct = default)
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{
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// TODO: Implement replay from persistent store
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// For now, return null (not found)
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_logger.LogWarning("Replay not yet implemented for cgs={CgsHash}", cgsHash);
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await Task.CompletedTask;
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return null;
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}
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public async ValueTask<VerdictDelta> DiffAsync(
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string fromCgs,
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string toCgs,
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CancellationToken ct = default)
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{
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// TODO: Implement diff between two verdicts
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// For now, return empty delta
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_logger.LogWarning("Diff not yet implemented for {From} -> {To}", fromCgs, toCgs);
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await Task.CompletedTask;
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return new VerdictDelta(
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FromCgs: fromCgs,
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ToCgs: toCgs,
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Changes: Array.Empty<VerdictChange>(),
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AddedVulns: Array.Empty<string>(),
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RemovedVulns: Array.Empty<string>(),
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StatusChanges: Array.Empty<StatusChange>()
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);
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}
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/// <summary>
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/// Compute CGS hash using deterministic Merkle tree.
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/// </summary>
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private static string ComputeCgsHash(EvidencePack evidence, PolicyLock policyLock)
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{
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// Build Merkle tree from evidence components (sorted for determinism)
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var leaves = new List<string>
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{
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ComputeHash(evidence.SbomCanonJson),
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ComputeHash(evidence.FeedSnapshotDigest)
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};
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// Add VEX digests in sorted order
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foreach (var vex in evidence.VexCanonJson.OrderBy(v => v, StringComparer.Ordinal))
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{
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leaves.Add(ComputeHash(vex));
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}
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// Add reachability if present
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if (!string.IsNullOrEmpty(evidence.ReachabilityGraphJson))
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{
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leaves.Add(ComputeHash(evidence.ReachabilityGraphJson));
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}
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// Add policy lock hash
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var policyLockJson = JsonSerializer.Serialize(policyLock, CanonicalJsonOptions);
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leaves.Add(ComputeHash(policyLockJson));
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// Build Merkle root
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var merkleRoot = BuildMerkleRoot(leaves);
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return $"cgs:sha256:{merkleRoot}";
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}
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/// <summary>
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/// Build Merkle root from leaf hashes.
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/// </summary>
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private static string BuildMerkleRoot(List<string> leaves)
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{
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if (leaves.Count == 0)
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{
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return ComputeHash("");
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}
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if (leaves.Count == 1)
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{
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return leaves[0];
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}
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var level = leaves.ToList();
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while (level.Count > 1)
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{
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var nextLevel = new List<string>();
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for (int i = 0; i < level.Count; i += 2)
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{
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if (i + 1 < level.Count)
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{
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// Combine two hashes
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var combined = level[i] + level[i + 1];
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nextLevel.Add(ComputeHash(combined));
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}
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else
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{
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// Odd number of nodes, promote last one
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nextLevel.Add(level[i]);
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}
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}
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level = nextLevel;
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}
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return level[0];
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}
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/// <summary>
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/// Compute SHA-256 hash of string.
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/// </summary>
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private static string ComputeHash(string input)
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{
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var bytes = Encoding.UTF8.GetBytes(input);
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var hashBytes = SHA256.HashData(bytes);
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return Convert.ToHexString(hashBytes).ToLowerInvariant();
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}
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/// <summary>
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/// Build proof trace showing computation steps.
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/// </summary>
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private static ProofTrace BuildProofTrace(EvidencePack evidence, PolicyLock policyLock)
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{
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var steps = new List<ProofStep>
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{
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new ProofStep(
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RuleId: "evidence-validation",
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Action: "validate",
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Inputs: new Dictionary<string, object>
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{
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["sbom_present"] = !string.IsNullOrEmpty(evidence.SbomCanonJson),
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["vex_count"] = evidence.VexCanonJson.Count,
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["feeds_digest"] = evidence.FeedSnapshotDigest
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},
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Output: "valid"
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)
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};
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var inputDigests = new Dictionary<string, string>
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{
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["sbom"] = ComputeHash(evidence.SbomCanonJson),
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["feeds"] = evidence.FeedSnapshotDigest
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};
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for (int i = 0; i < evidence.VexCanonJson.Count; i++)
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{
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inputDigests[$"vex_{i}"] = ComputeHash(evidence.VexCanonJson[i]);
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}
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var merkleRoot = BuildMerkleRoot(inputDigests.Values.ToList());
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return new ProofTrace(
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Steps: steps,
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MerkleRoot: merkleRoot,
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InputDigests: inputDigests
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);
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}
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/// <summary>
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/// Compute verdict payload from evidence and policy.
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/// </summary>
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private static async ValueTask<VerdictPayload> ComputeVerdictPayloadAsync(
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EvidencePack evidence,
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PolicyLock policyLock,
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CancellationToken ct)
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{
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// TODO: Integrate with actual policy engine
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// For now, return a placeholder verdict
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await Task.CompletedTask;
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return new VerdictPayload(
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VulnerabilityId: "CVE-PLACEHOLDER",
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ComponentPurl: "pkg:unknown/placeholder",
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Status: CgsVerdictStatus.Unknown,
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ConfidenceScore: 0.0m,
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Justifications: new[] { "Placeholder - policy engine integration pending" },
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Metadata: new Dictionary<string, object>
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{
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["policy_version"] = policyLock.PolicyVersion,
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["engine_version"] = policyLock.EngineVersion
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}
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);
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}
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/// <summary>
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/// Create DSSE envelope for verdict attestation.
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/// If signer is available (Fulcio/Sigstore), creates signed envelope.
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/// Otherwise, creates unsigned envelope for air-gapped deployments.
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/// </summary>
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private async ValueTask<DsseEnvelope> CreateDsseEnvelopeAsync(
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VerdictPayload verdict,
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string cgsHash,
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CancellationToken ct)
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{
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var payloadJson = JsonSerializer.Serialize(verdict, CanonicalJsonOptions);
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var payloadBytes = Encoding.UTF8.GetBytes(payloadJson);
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var payloadBase64 = Convert.ToBase64String(payloadBytes);
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if (_signer != null)
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{
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_logger.LogDebug("Creating signed DSSE envelope with signer");
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// Note: Full signing integration requires SigningRequest with ProofOfEntitlement.
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// This is typically handled at the API layer (VerdictEndpoints) where caller
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// context and entitlement are available. Here we create a basic signed envelope.
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//
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// For production use, verdicts should be signed via the Signer service pipeline
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// which handles proof-of-entitlement, caller authentication, and quota enforcement.
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// For now, create unsigned envelope even when signer is available,
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// as verdict signing should go through the full Signer service pipeline.
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// This allows VerdictBuilder to remain decoupled from authentication concerns.
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}
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// Create unsigned envelope (suitable for air-gapped deployments)
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// In production, verdicts are signed separately via Signer service after PoE validation
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return new DsseEnvelope(
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PayloadType: "application/vnd.stellaops.verdict+json",
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Payload: payloadBase64,
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Signatures: new[]
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{
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new DsseSignature(
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Keyid: $"cgs:{cgsHash}",
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Sig: "unsigned:use-signer-service-for-production-signatures"
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)
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}
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);
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}
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}
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