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feat(domain): scan before the PDF check so malware is always reported as infected (refs #192)

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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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2026-10-02 09:53:23 +02:00
co-authored by Claude Opus 5.5
parent c245182c87
commit 4e7e0526b2
1 changed files with 5 additions and 4 deletions
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services/domain/Big.Application/ProvideDocuments.cs
+5 -4
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@@ -50,16 +50,17 @@ public sealed class ProvideDocuments(IRegistrationStore store, IWorkflowClient w
return ProvideDocumentsOutcome.NotFound; return ProvideDocumentsOutcome.NotFound;
// Only a clean PDF goes any further (S-29, ADR-0036): checked after ownership, so a stranger // Only a clean PDF goes any further (S-29, ADR-0036): checked after ownership, so a stranger
// learns nothing about the file, and before anything is stored or the wait is completed. // learns nothing about the file, and before anything is stored or the wait is completed. Scan
if (!command.Content.AsSpan().StartsWith("%PDF-"u8)) // before the PDF check, so malware is reported as malware whatever it claims to be.
return ProvideDocumentsOutcome.NotAPdf;
switch (await scanner.ScanAsync(command.Content, ct)) switch (await scanner.ScanAsync(command.Content, ct))
{ {
case ScanVerdict.Infected: return ProvideDocumentsOutcome.Infected; case ScanVerdict.Infected: return ProvideDocumentsOutcome.Infected;
case ScanVerdict.Unavailable: return ProvideDocumentsOutcome.ScannerUnavailable; case ScanVerdict.Unavailable: return ProvideDocumentsOutcome.ScannerUnavailable;
} }
if (!command.Content.AsSpan().StartsWith("%PDF-"u8))
return ProvideDocumentsOutcome.NotAPdf;
// Store the diploma against the zaak (once it is opened) — the ACL is the only ZGW caller (§8.1). // Store the diploma against the zaak (once it is opened) — the ACL is the only ZGW caller (§8.1).
if (registration.ZaakUrl is not null) if (registration.ZaakUrl is not null)
await acl.StoreDiplomaAsync( await acl.StoreDiplomaAsync(