494 lines
19 KiB
C#
494 lines
19 KiB
C#
using System.Collections.Immutable;
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using System.Globalization;
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using System.IO;
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using System.IO.Compression;
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using System.Security.Cryptography;
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using System.Linq;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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using System.Xml;
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using System.Xml.Linq;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Options;
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using MongoDB.Bson;
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using StellaOps.Feedser.Normalization.Cvss;
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using StellaOps.Feedser.Source.Common;
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using StellaOps.Feedser.Source.Common.Fetch;
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using StellaOps.Feedser.Source.Ru.Bdu.Configuration;
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using StellaOps.Feedser.Source.Ru.Bdu.Internal;
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using StellaOps.Feedser.Storage.Mongo;
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using StellaOps.Feedser.Storage.Mongo.Advisories;
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using StellaOps.Feedser.Storage.Mongo.Documents;
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using StellaOps.Feedser.Storage.Mongo.Dtos;
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using StellaOps.Plugin;
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namespace StellaOps.Feedser.Source.Ru.Bdu;
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public sealed class RuBduConnector : IFeedConnector
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{
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private static readonly JsonSerializerOptions SerializerOptions = new(JsonSerializerDefaults.Web)
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{
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DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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WriteIndented = false,
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};
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private readonly SourceFetchService _fetchService;
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private readonly RawDocumentStorage _rawDocumentStorage;
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private readonly IDocumentStore _documentStore;
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private readonly IDtoStore _dtoStore;
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private readonly IAdvisoryStore _advisoryStore;
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private readonly ISourceStateRepository _stateRepository;
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private readonly RuBduOptions _options;
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private readonly TimeProvider _timeProvider;
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private readonly ILogger<RuBduConnector> _logger;
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private readonly string _cacheDirectory;
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private readonly string _archiveCachePath;
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public RuBduConnector(
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SourceFetchService fetchService,
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RawDocumentStorage rawDocumentStorage,
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IDocumentStore documentStore,
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IDtoStore dtoStore,
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IAdvisoryStore advisoryStore,
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ISourceStateRepository stateRepository,
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IOptions<RuBduOptions> options,
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TimeProvider? timeProvider,
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ILogger<RuBduConnector> logger)
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{
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_fetchService = fetchService ?? throw new ArgumentNullException(nameof(fetchService));
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_rawDocumentStorage = rawDocumentStorage ?? throw new ArgumentNullException(nameof(rawDocumentStorage));
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_documentStore = documentStore ?? throw new ArgumentNullException(nameof(documentStore));
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_dtoStore = dtoStore ?? throw new ArgumentNullException(nameof(dtoStore));
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_advisoryStore = advisoryStore ?? throw new ArgumentNullException(nameof(advisoryStore));
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_stateRepository = stateRepository ?? throw new ArgumentNullException(nameof(stateRepository));
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_options = (options ?? throw new ArgumentNullException(nameof(options))).Value ?? throw new ArgumentNullException(nameof(options));
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_options.Validate();
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_timeProvider = timeProvider ?? TimeProvider.System;
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_logger = logger ?? throw new ArgumentNullException(nameof(logger));
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_cacheDirectory = ResolveCacheDirectory(_options.CacheDirectory);
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_archiveCachePath = Path.Combine(_cacheDirectory, "vulxml.zip");
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EnsureCacheDirectory();
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}
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public string SourceName => RuBduConnectorPlugin.SourceName;
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public async Task FetchAsync(IServiceProvider services, CancellationToken cancellationToken)
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{
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ArgumentNullException.ThrowIfNull(services);
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var cursor = await GetCursorAsync(cancellationToken).ConfigureAwait(false);
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var pendingDocuments = cursor.PendingDocuments.ToHashSet();
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var pendingMappings = cursor.PendingMappings.ToHashSet();
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var now = _timeProvider.GetUtcNow();
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SourceFetchContentResult archiveResult = default;
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byte[]? archiveContent = null;
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var usedCache = false;
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try
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{
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var request = new SourceFetchRequest(RuBduOptions.HttpClientName, SourceName, _options.DataArchiveUri)
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{
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AcceptHeaders = new[]
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{
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"application/zip",
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"application/octet-stream",
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"application/x-zip-compressed",
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},
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TimeoutOverride = _options.RequestTimeout,
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};
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archiveResult = await _fetchService.FetchContentAsync(request, cancellationToken).ConfigureAwait(false);
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if (archiveResult.IsNotModified)
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{
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_logger.LogDebug("RU-BDU archive not modified.");
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await UpdateCursorAsync(cursor.WithLastSuccessfulFetch(now), cancellationToken).ConfigureAwait(false);
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return;
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}
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if (archiveResult.IsSuccess && archiveResult.Content is not null)
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{
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archiveContent = archiveResult.Content;
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TryWriteCachedArchive(archiveContent);
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}
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}
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catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException)
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{
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if (TryReadCachedArchive(out var cachedFallback))
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{
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_logger.LogWarning(ex, "RU-BDU archive fetch failed; using cached artefact {CachePath}", _archiveCachePath);
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archiveContent = cachedFallback;
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usedCache = true;
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}
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else
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{
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_logger.LogError(ex, "RU-BDU archive fetch failed for {ArchiveUri}", _options.DataArchiveUri);
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await _stateRepository.MarkFailureAsync(SourceName, now, _options.FailureBackoff, ex.Message, cancellationToken).ConfigureAwait(false);
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throw;
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}
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}
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if (archiveContent is null)
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{
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if (TryReadCachedArchive(out var cachedFallback))
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{
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_logger.LogWarning("RU-BDU archive unavailable (status={Status}); using cached artefact {CachePath}", archiveResult.StatusCode, _archiveCachePath);
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archiveContent = cachedFallback;
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usedCache = true;
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}
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else
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{
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_logger.LogWarning("RU-BDU archive fetch returned no content (status={Status})", archiveResult.StatusCode);
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await UpdateCursorAsync(cursor.WithLastSuccessfulFetch(now), cancellationToken).ConfigureAwait(false);
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return;
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}
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}
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var archiveLastModified = archiveResult.LastModified;
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int added;
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try
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{
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added = await ProcessArchiveAsync(archiveContent, now, pendingDocuments, pendingMappings, archiveLastModified, cancellationToken).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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if (!usedCache)
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{
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_logger.LogError(ex, "RU-BDU archive processing failed");
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await _stateRepository.MarkFailureAsync(SourceName, now, _options.FailureBackoff, ex.Message, cancellationToken).ConfigureAwait(false);
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}
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throw;
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}
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var updatedCursor = cursor
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.WithPendingDocuments(pendingDocuments)
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.WithPendingMappings(pendingMappings)
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.WithLastSuccessfulFetch(now);
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await UpdateCursorAsync(updatedCursor, cancellationToken).ConfigureAwait(false);
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}
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public async Task ParseAsync(IServiceProvider services, CancellationToken cancellationToken)
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{
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ArgumentNullException.ThrowIfNull(services);
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var cursor = await GetCursorAsync(cancellationToken).ConfigureAwait(false);
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if (cursor.PendingDocuments.Count == 0)
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{
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return;
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}
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var pendingDocuments = cursor.PendingDocuments.ToList();
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var pendingMappings = cursor.PendingMappings.ToList();
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foreach (var documentId in cursor.PendingDocuments)
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{
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cancellationToken.ThrowIfCancellationRequested();
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var document = await _documentStore.FindAsync(documentId, cancellationToken).ConfigureAwait(false);
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if (document is null)
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{
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pendingDocuments.Remove(documentId);
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pendingMappings.Remove(documentId);
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continue;
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}
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if (!document.GridFsId.HasValue)
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{
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_logger.LogWarning("RU-BDU document {DocumentId} missing GridFS payload", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingDocuments.Remove(documentId);
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pendingMappings.Remove(documentId);
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continue;
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}
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byte[] payload;
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try
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{
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payload = await _rawDocumentStorage.DownloadAsync(document.GridFsId.Value, cancellationToken).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "RU-BDU unable to download raw document {DocumentId}", documentId);
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throw;
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}
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RuBduVulnerabilityDto? dto;
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try
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{
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dto = JsonSerializer.Deserialize<RuBduVulnerabilityDto>(payload, SerializerOptions);
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "RU-BDU failed to deserialize document {DocumentId}", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingDocuments.Remove(documentId);
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pendingMappings.Remove(documentId);
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continue;
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}
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if (dto is null)
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{
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_logger.LogWarning("RU-BDU document {DocumentId} produced null DTO", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingDocuments.Remove(documentId);
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pendingMappings.Remove(documentId);
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continue;
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}
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var bson = MongoDB.Bson.BsonDocument.Parse(JsonSerializer.Serialize(dto, SerializerOptions));
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var dtoRecord = new DtoRecord(Guid.NewGuid(), document.Id, SourceName, "ru-bdu.v1", bson, _timeProvider.GetUtcNow());
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await _dtoStore.UpsertAsync(dtoRecord, cancellationToken).ConfigureAwait(false);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.PendingMap, cancellationToken).ConfigureAwait(false);
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pendingDocuments.Remove(documentId);
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if (!pendingMappings.Contains(documentId))
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{
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pendingMappings.Add(documentId);
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}
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}
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var updatedCursor = cursor
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.WithPendingDocuments(pendingDocuments)
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.WithPendingMappings(pendingMappings);
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await UpdateCursorAsync(updatedCursor, cancellationToken).ConfigureAwait(false);
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}
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public async Task MapAsync(IServiceProvider services, CancellationToken cancellationToken)
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{
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ArgumentNullException.ThrowIfNull(services);
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var cursor = await GetCursorAsync(cancellationToken).ConfigureAwait(false);
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if (cursor.PendingMappings.Count == 0)
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{
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return;
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}
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var pendingMappings = cursor.PendingMappings.ToList();
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foreach (var documentId in cursor.PendingMappings)
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{
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cancellationToken.ThrowIfCancellationRequested();
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var document = await _documentStore.FindAsync(documentId, cancellationToken).ConfigureAwait(false);
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if (document is null)
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{
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pendingMappings.Remove(documentId);
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continue;
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}
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var dtoRecord = await _dtoStore.FindByDocumentIdAsync(documentId, cancellationToken).ConfigureAwait(false);
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if (dtoRecord is null)
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{
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_logger.LogWarning("RU-BDU document {DocumentId} missing DTO payload", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingMappings.Remove(documentId);
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continue;
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}
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RuBduVulnerabilityDto dto;
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try
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{
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dto = JsonSerializer.Deserialize<RuBduVulnerabilityDto>(dtoRecord.Payload.ToString(), SerializerOptions) ?? throw new InvalidOperationException("DTO deserialized to null");
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "RU-BDU failed to deserialize DTO for document {DocumentId}", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingMappings.Remove(documentId);
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continue;
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}
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try
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{
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var advisory = RuBduMapper.Map(dto, document, dtoRecord.ValidatedAt);
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await _advisoryStore.UpsertAsync(advisory, cancellationToken).ConfigureAwait(false);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Mapped, cancellationToken).ConfigureAwait(false);
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pendingMappings.Remove(documentId);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "RU-BDU mapping failed for document {DocumentId}", documentId);
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await _documentStore.UpdateStatusAsync(document.Id, DocumentStatuses.Failed, cancellationToken).ConfigureAwait(false);
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pendingMappings.Remove(documentId);
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}
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}
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var updatedCursor = cursor.WithPendingMappings(pendingMappings);
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await UpdateCursorAsync(updatedCursor, cancellationToken).ConfigureAwait(false);
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}
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private async Task<int> ProcessArchiveAsync(
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byte[] archiveContent,
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DateTimeOffset now,
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HashSet<Guid> pendingDocuments,
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HashSet<Guid> pendingMappings,
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DateTimeOffset? archiveLastModified,
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CancellationToken cancellationToken)
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{
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var added = 0;
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using var archiveStream = new MemoryStream(archiveContent, writable: false);
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using var archive = new ZipArchive(archiveStream, ZipArchiveMode.Read, leaveOpen: false);
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var entry = archive.GetEntry("export/export.xml") ?? archive.Entries.FirstOrDefault();
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if (entry is null)
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{
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_logger.LogWarning("RU-BDU archive does not contain export/export.xml; skipping.");
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return added;
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}
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await using var entryStream = entry.Open();
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using var reader = XmlReader.Create(entryStream, new XmlReaderSettings
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{
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IgnoreComments = true,
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IgnoreWhitespace = true,
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DtdProcessing = DtdProcessing.Ignore,
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CloseInput = false,
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});
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while (reader.Read())
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{
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cancellationToken.ThrowIfCancellationRequested();
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if (reader.NodeType != XmlNodeType.Element || !reader.Name.Equals("vul", StringComparison.OrdinalIgnoreCase))
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{
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continue;
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}
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if (RuBduXmlParser.TryParse(XNode.ReadFrom(reader) as XElement ?? new XElement("vul")) is not { } dto)
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{
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continue;
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}
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var payload = JsonSerializer.SerializeToUtf8Bytes(dto, SerializerOptions);
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var sha = Convert.ToHexString(SHA256.HashData(payload)).ToLowerInvariant();
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var documentUri = BuildDocumentUri(dto.Identifier);
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var existing = await _documentStore.FindBySourceAndUriAsync(SourceName, documentUri, cancellationToken).ConfigureAwait(false);
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if (existing is not null && string.Equals(existing.Sha256, sha, StringComparison.OrdinalIgnoreCase))
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{
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continue;
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}
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var gridFsId = await _rawDocumentStorage.UploadAsync(SourceName, documentUri, payload, "application/json", null, cancellationToken).ConfigureAwait(false);
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var metadata = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
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{
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["ru-bdu.identifier"] = dto.Identifier,
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};
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if (!string.IsNullOrWhiteSpace(dto.Name))
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{
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metadata["ru-bdu.name"] = dto.Name!;
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}
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var recordId = existing?.Id ?? Guid.NewGuid();
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var record = new DocumentRecord(
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recordId,
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SourceName,
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documentUri,
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now,
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sha,
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DocumentStatuses.PendingParse,
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"application/json",
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Headers: null,
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Metadata: metadata,
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Etag: null,
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LastModified: archiveLastModified ?? dto.IdentifyDate,
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GridFsId: gridFsId,
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ExpiresAt: null);
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var upserted = await _documentStore.UpsertAsync(record, cancellationToken).ConfigureAwait(false);
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pendingDocuments.Add(upserted.Id);
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pendingMappings.Remove(upserted.Id);
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added++;
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if (added >= _options.MaxVulnerabilitiesPerFetch)
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{
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break;
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}
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}
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return added;
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}
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private string ResolveCacheDirectory(string? configuredPath)
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{
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if (!string.IsNullOrWhiteSpace(configuredPath))
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{
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return Path.GetFullPath(Path.IsPathRooted(configuredPath)
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? configuredPath
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: Path.Combine(AppContext.BaseDirectory, configuredPath));
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}
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return Path.Combine(AppContext.BaseDirectory, "cache", RuBduConnectorPlugin.SourceName);
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}
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private void EnsureCacheDirectory()
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{
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try
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{
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Directory.CreateDirectory(_cacheDirectory);
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "RU-BDU unable to ensure cache directory {CachePath}", _cacheDirectory);
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}
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}
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private void TryWriteCachedArchive(byte[] content)
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{
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try
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{
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Directory.CreateDirectory(Path.GetDirectoryName(_archiveCachePath)!);
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File.WriteAllBytes(_archiveCachePath, content);
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}
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catch (Exception ex)
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{
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_logger.LogDebug(ex, "RU-BDU failed to write cache archive {CachePath}", _archiveCachePath);
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}
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}
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private bool TryReadCachedArchive(out byte[] content)
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{
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try
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{
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if (File.Exists(_archiveCachePath))
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{
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content = File.ReadAllBytes(_archiveCachePath);
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return true;
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}
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}
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catch (Exception ex)
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{
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_logger.LogDebug(ex, "RU-BDU failed to read cache archive {CachePath}", _archiveCachePath);
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}
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content = Array.Empty<byte>();
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return false;
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}
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private static string BuildDocumentUri(string identifier)
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{
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var slug = identifier.Contains(':', StringComparison.Ordinal)
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? identifier[(identifier.IndexOf(':') + 1)..]
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: identifier;
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return $"https://bdu.fstec.ru/vul/{slug}";
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}
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private async Task<RuBduCursor> GetCursorAsync(CancellationToken cancellationToken)
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{
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var state = await _stateRepository.TryGetAsync(SourceName, cancellationToken).ConfigureAwait(false);
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return state is null ? RuBduCursor.Empty : RuBduCursor.FromBson(state.Cursor);
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}
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private Task UpdateCursorAsync(RuBduCursor cursor, CancellationToken cancellationToken)
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{
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var document = cursor.ToBsonDocument();
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var completedAt = cursor.LastSuccessfulFetch ?? _timeProvider.GetUtcNow();
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return _stateRepository.UpdateCursorAsync(SourceName, document, completedAt, cancellationToken);
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}
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}
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