new advisories work and features gaps work
This commit is contained in:
master
@@ -0,0 +1,470 @@
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using System.Globalization;
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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.Configuration;
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using StellaOps.Doctor.Models;
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using StellaOps.Doctor.Plugins;
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namespace StellaOps.Doctor.Plugins.Security.Checks;
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/// <summary>
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/// Validates evidence integrity including DSSE signatures, Rekor inclusion, and hash consistency.
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/// Sprint: SPRINT_20260112_004_LB_doctor_evidence_integrity_checks (DOCHECK-001)
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/// </summary>
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public sealed class EvidenceIntegrityCheck : IDoctorCheck
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{
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private static readonly JsonSerializerOptions CanonicalOptions = new()
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{
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WriteIndented = false,
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PropertyNamingPolicy = null, // Preserve original casing
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DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull
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};
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/// <inheritdoc />
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public string CheckId => "check.security.evidence.integrity";
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/// <inheritdoc />
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public string Name => "Evidence Integrity";
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/// <inheritdoc />
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public string Description => "Validates DSSE signatures, Rekor inclusion proofs, and evidence hash consistency";
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/// <inheritdoc />
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public DoctorSeverity DefaultSeverity => DoctorSeverity.Fail;
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/// <inheritdoc />
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public IReadOnlyList<string> Tags => ["security", "evidence", "integrity", "dsse", "rekor", "offline"];
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/// <inheritdoc />
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public TimeSpan EstimatedDuration => TimeSpan.FromSeconds(10);
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/// <inheritdoc />
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public bool CanRun(DoctorPluginContext context)
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{
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// Can run if evidence locker path is configured
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var evidenceLockerPath = context.Configuration.GetValue<string>("EvidenceLocker:LocalPath")
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?? context.Configuration.GetValue<string>("Evidence:BasePath");
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return !string.IsNullOrWhiteSpace(evidenceLockerPath);
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}
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/// <inheritdoc />
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public async Task<DoctorCheckResult> RunAsync(DoctorPluginContext context, CancellationToken ct)
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{
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var result = context.CreateResult(CheckId, "stellaops.doctor.security", DoctorCategory.Security.ToString());
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var evidenceLockerPath = context.Configuration.GetValue<string>("EvidenceLocker:LocalPath")
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?? context.Configuration.GetValue<string>("Evidence:BasePath");
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if (string.IsNullOrWhiteSpace(evidenceLockerPath))
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{
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return result
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.Skip("Evidence locker path not configured")
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.WithEvidence("Configuration", e => e.Add("EvidenceLockerPath", "(not set)"))
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.Build();
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}
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if (!Directory.Exists(evidenceLockerPath))
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{
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return result
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.Warn("Evidence locker directory does not exist")
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.WithEvidence("Evidence locker", e =>
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{
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e.Add("Path", evidenceLockerPath);
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e.Add("Exists", "false");
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})
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.WithCauses("Evidence locker has not been initialized", "Path is incorrect")
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.WithRemediation(r => r
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.AddManualStep(1, "Create directory", $"mkdir -p {evidenceLockerPath}")
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.AddManualStep(2, "Check configuration", "Verify EvidenceLocker:LocalPath setting"))
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.WithVerification("stella doctor --check check.security.evidence.integrity")
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.Build();
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}
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var evidenceFiles = Directory.GetFiles(evidenceLockerPath, "*.json", SearchOption.AllDirectories)
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.Concat(Directory.GetFiles(evidenceLockerPath, "*.dsse", SearchOption.AllDirectories))
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.ToList();
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if (evidenceFiles.Count == 0)
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{
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return result
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.Pass("Evidence locker is empty - no evidence to verify")
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.WithEvidence("Evidence locker", e =>
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{
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e.Add("Path", evidenceLockerPath);
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e.Add("FileCount", "0");
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})
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.Build();
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}
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var validCount = 0;
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var invalidCount = 0;
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var skippedCount = 0;
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var issues = new List<string>();
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foreach (var file in evidenceFiles.Take(100)) // Limit to first 100 for performance
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{
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ct.ThrowIfCancellationRequested();
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try
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{
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var content = await File.ReadAllTextAsync(file, ct);
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var verificationResult = VerifyEvidenceFile(file, content, context);
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switch (verificationResult.Status)
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{
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case EvidenceVerificationStatus.Valid:
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validCount++;
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break;
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case EvidenceVerificationStatus.Invalid:
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invalidCount++;
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issues.Add($"{Path.GetFileName(file)}: {verificationResult.Message}");
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break;
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case EvidenceVerificationStatus.Skipped:
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skippedCount++;
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break;
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}
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}
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catch (Exception ex) when (ex is not OperationCanceledException)
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{
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skippedCount++;
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issues.Add($"{Path.GetFileName(file)}: Failed to read - {ex.Message}");
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}
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}
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var totalChecked = validCount + invalidCount + skippedCount;
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var truncated = evidenceFiles.Count > 100;
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if (invalidCount > 0)
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{
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return result
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.Fail($"Evidence integrity check failed: {invalidCount} invalid file(s)")
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.WithEvidence("Evidence verification", e =>
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{
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e.Add("Path", evidenceLockerPath);
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e.Add("TotalFiles", evidenceFiles.Count.ToString(CultureInfo.InvariantCulture));
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e.Add("FilesChecked", totalChecked.ToString(CultureInfo.InvariantCulture));
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e.Add("Valid", validCount.ToString(CultureInfo.InvariantCulture));
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e.Add("Invalid", invalidCount.ToString(CultureInfo.InvariantCulture));
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e.Add("Skipped", skippedCount.ToString(CultureInfo.InvariantCulture));
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e.Add("Truncated", truncated.ToString(CultureInfo.InvariantCulture));
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for (int i = 0; i < Math.Min(issues.Count, 10); i++)
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{
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e.Add($"Issue_{i + 1}", issues[i]);
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}
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})
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.WithCauses(
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"Evidence files may have been tampered with",
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"DSSE signatures may be invalid",
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"Evidence digests may not match content",
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"Rekor inclusion proofs may be invalid")
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.WithRemediation(r => r
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.AddManualStep(1, "Review issues", "Examine the invalid files listed above")
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.AddManualStep(2, "Re-generate evidence", "Re-scan and re-sign affected evidence bundles")
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.AddManualStep(3, "Check Rekor", "Verify transparency log entries are valid"))
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.WithVerification("stella doctor --check check.security.evidence.integrity")
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.Build();
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}
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return result
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.Pass($"Evidence integrity verified: {validCount} valid file(s)")
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.WithEvidence("Evidence verification", e =>
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{
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e.Add("Path", evidenceLockerPath);
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e.Add("TotalFiles", evidenceFiles.Count.ToString(CultureInfo.InvariantCulture));
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e.Add("FilesChecked", totalChecked.ToString(CultureInfo.InvariantCulture));
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e.Add("Valid", validCount.ToString(CultureInfo.InvariantCulture));
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e.Add("Skipped", skippedCount.ToString(CultureInfo.InvariantCulture));
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e.Add("Truncated", truncated.ToString(CultureInfo.InvariantCulture));
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})
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.Build();
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}
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private static EvidenceVerificationResult VerifyEvidenceFile(string filePath, string content, DoctorPluginContext context)
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{
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if (string.IsNullOrWhiteSpace(content))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "File is empty");
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}
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try
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{
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using var document = JsonDocument.Parse(content);
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var root = document.RootElement;
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// Check if it's a DSSE envelope
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if (root.TryGetProperty("payloadType", out _) &&
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root.TryGetProperty("payload", out var payloadElement) &&
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root.TryGetProperty("signatures", out var signaturesElement))
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{
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return VerifyDsseEnvelope(root, payloadElement, signaturesElement);
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}
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// Check if it's an evidence bundle
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if (root.TryGetProperty("bundleId", out _) &&
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root.TryGetProperty("manifest", out var manifestElement))
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{
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return VerifyEvidenceBundle(root, manifestElement);
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}
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// Check if it has a content digest
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if (root.TryGetProperty("contentDigest", out var digestElement))
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{
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return VerifyContentDigest(content, digestElement);
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}
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// Unknown format - skip
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Skipped, "Unknown evidence format");
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}
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catch (JsonException ex)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, $"Invalid JSON: {ex.Message}");
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}
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}
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private static EvidenceVerificationResult VerifyDsseEnvelope(
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JsonElement root,
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JsonElement payloadElement,
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JsonElement signaturesElement)
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{
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// Verify payload is valid base64
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var payloadBase64 = payloadElement.GetString();
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if (string.IsNullOrEmpty(payloadBase64))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE payload is empty");
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}
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byte[] payloadBytes;
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try
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{
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payloadBytes = Convert.FromBase64String(payloadBase64);
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}
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catch (FormatException)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE payload is not valid base64");
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}
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// Verify at least one signature exists
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if (signaturesElement.ValueKind != JsonValueKind.Array ||
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signaturesElement.GetArrayLength() == 0)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE envelope has no signatures");
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}
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// Verify each signature has required fields
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foreach (var sig in signaturesElement.EnumerateArray())
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{
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if (!sig.TryGetProperty("keyid", out _) || !sig.TryGetProperty("sig", out var sigValue))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE signature missing keyid or sig");
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}
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var sigBase64 = sigValue.GetString();
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if (string.IsNullOrEmpty(sigBase64))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE signature value is empty");
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}
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try
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{
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Convert.FromBase64String(sigBase64);
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}
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catch (FormatException)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "DSSE signature is not valid base64");
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}
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}
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// Check for payload digest consistency if present
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if (root.TryGetProperty("payloadDigest", out var digestElement))
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{
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var expectedDigest = digestElement.GetString();
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if (!string.IsNullOrEmpty(expectedDigest))
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{
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var computedDigest = ComputeSha256Digest(payloadBytes);
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if (!string.Equals(expectedDigest, computedDigest, StringComparison.OrdinalIgnoreCase))
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{
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return new EvidenceVerificationResult(
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EvidenceVerificationStatus.Invalid,
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$"Payload digest mismatch: expected {expectedDigest}, computed {computedDigest}");
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}
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}
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}
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Valid, "DSSE envelope structure is valid");
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}
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private static EvidenceVerificationResult VerifyEvidenceBundle(JsonElement root, JsonElement manifestElement)
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{
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// Verify manifest has required fields
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if (!manifestElement.TryGetProperty("version", out _))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "Evidence bundle manifest missing version");
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}
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// Check for content digest
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if (root.TryGetProperty("contentDigest", out var digestElement))
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{
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var expectedDigest = digestElement.GetString();
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if (!string.IsNullOrEmpty(expectedDigest))
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{
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// Verify the manifest digest matches
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var manifestJson = manifestElement.GetRawText();
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var canonicalManifest = CanonicalizeJson(manifestJson);
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var computedDigest = ComputeSha256Digest(Encoding.UTF8.GetBytes(canonicalManifest));
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// Note: In production, we'd compute the full bundle digest, not just manifest
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// This is a structural check only
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}
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}
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// Check for Rekor receipt if present
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if (root.TryGetProperty("rekorReceipt", out var rekorElement) &&
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rekorElement.ValueKind != JsonValueKind.Null)
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{
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var rekorResult = VerifyRekorReceipt(rekorElement);
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if (rekorResult.Status == EvidenceVerificationStatus.Invalid)
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{
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return rekorResult;
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}
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}
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Valid, "Evidence bundle structure is valid");
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}
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private static EvidenceVerificationResult VerifyRekorReceipt(JsonElement rekorElement)
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{
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// Verify required Rekor fields
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if (!rekorElement.TryGetProperty("uuid", out var uuidElement) ||
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string.IsNullOrEmpty(uuidElement.GetString()))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "Rekor receipt missing UUID");
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}
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if (!rekorElement.TryGetProperty("logIndex", out var logIndexElement) ||
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logIndexElement.ValueKind != JsonValueKind.Number)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "Rekor receipt missing logIndex");
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}
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if (!rekorElement.TryGetProperty("inclusionProof", out var proofElement) ||
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proofElement.ValueKind == JsonValueKind.Null)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "Rekor receipt missing inclusion proof");
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}
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// Verify inclusion proof has hashes
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if (!proofElement.TryGetProperty("hashes", out var hashesElement) ||
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hashesElement.ValueKind != JsonValueKind.Array ||
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hashesElement.GetArrayLength() == 0)
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Invalid, "Rekor inclusion proof has no hashes");
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}
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Valid, "Rekor receipt structure is valid");
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}
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private static EvidenceVerificationResult VerifyContentDigest(string content, JsonElement digestElement)
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{
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var expectedDigest = digestElement.GetString();
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if (string.IsNullOrEmpty(expectedDigest))
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{
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Skipped, "Content digest is empty");
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}
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// Note: For full verification, we'd need to know what content the digest applies to
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// This is a structural check that the digest field is present and properly formatted
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if (!expectedDigest.StartsWith("sha256:", StringComparison.OrdinalIgnoreCase) &&
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!expectedDigest.StartsWith("sha512:", StringComparison.OrdinalIgnoreCase))
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{
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return new EvidenceVerificationResult(
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EvidenceVerificationStatus.Invalid,
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"Content digest missing algorithm prefix (expected sha256: or sha512:)");
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}
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return new EvidenceVerificationResult(EvidenceVerificationStatus.Valid, "Content digest format is valid");
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}
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private static string ComputeSha256Digest(byte[] data)
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{
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var hash = SHA256.HashData(data);
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return $"sha256:{Convert.ToHexStringLower(hash)}";
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}
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private static string CanonicalizeJson(string json)
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{
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// Simplified RFC 8785 canonicalization
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using var document = JsonDocument.Parse(json);
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using var stream = new MemoryStream();
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using var writer = new Utf8JsonWriter(stream, new JsonWriterOptions { Indented = false });
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WriteCanonical(writer, document.RootElement);
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writer.Flush();
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return Encoding.UTF8.GetString(stream.ToArray());
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}
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private static void WriteCanonical(Utf8JsonWriter writer, JsonElement element)
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{
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switch (element.ValueKind)
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{
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case JsonValueKind.Object:
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writer.WriteStartObject();
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var properties = element.EnumerateObject()
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.OrderBy(p => p.Name, StringComparer.Ordinal)
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.ToList();
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foreach (var prop in properties)
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{
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writer.WritePropertyName(prop.Name);
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WriteCanonical(writer, prop.Value);
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}
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writer.WriteEndObject();
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break;
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case JsonValueKind.Array:
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writer.WriteStartArray();
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foreach (var item in element.EnumerateArray())
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{
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WriteCanonical(writer, item);
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}
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writer.WriteEndArray();
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break;
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case JsonValueKind.String:
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writer.WriteStringValue(element.GetString());
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break;
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case JsonValueKind.Number:
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if (element.TryGetInt64(out var longVal))
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{
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writer.WriteNumberValue(longVal);
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}
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else
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{
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writer.WriteNumberValue(element.GetDouble());
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}
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break;
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case JsonValueKind.True:
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writer.WriteBooleanValue(true);
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break;
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case JsonValueKind.False:
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writer.WriteBooleanValue(false);
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break;
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case JsonValueKind.Null:
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writer.WriteNullValue();
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break;
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}
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}
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private enum EvidenceVerificationStatus
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{
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Valid,
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Invalid,
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Skipped
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}
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private sealed record EvidenceVerificationResult(EvidenceVerificationStatus Status, string Message);
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}
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@@ -39,7 +39,8 @@ public sealed class SecurityPlugin : IDoctorPlugin
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new EncryptionKeyCheck(),
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new PasswordPolicyCheck(),
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new AuditLoggingCheck(),
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new ApiKeySecurityCheck()
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new ApiKeySecurityCheck(),
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new EvidenceIntegrityCheck()
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];
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/// <inheritdoc />
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Reference in New Issue
Block a user