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security(import): block Unicode lookalike path separators in isValidImportFilename

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Adds checks for U+2215 DIVISION SLASH (∕), U+FF0F FULLWIDTH SOLIDUS (／),
and U+29F5 REVERSE SOLIDUS OPERATOR (⧵) — all of which bypass the existing
ASCII separator checks on Linux path resolution. Adds a clarifying comment on
the Paths.get().isAbsolute() call explaining its InvalidPathException safety
boundary. Adds 3 regression tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-21 10:06:49 +02:00
parent 38a4ca2e34
commit 429ff32eda
2 changed files with 24 additions and 0 deletions
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6
backend/src/main/java/org/raddatz/familienarchiv/importing/MassImportService.java
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@@ -329,9 +329,15 @@ public class MassImportService {
if (filename == null || filename.isBlank()) return false;
if (filename.contains("/")) return false;
if (filename.contains("\\")) return false;
if (filename.contains("∕")) return false; // U+2215 DIVISION SLASH
if (filename.contains("／")) return false; // U+FF0F FULLWIDTH SOLIDUS
if (filename.contains("⧵")) return false; // U+29F5 REVERSE SOLIDUS OPERATOR
if (filename.contains("..")) return false;
if (filename.equals(".")) return false;
if (filename.contains("\0")) return false;
// Paths.get() is safe here on Linux for all inputs that passed the checks above;
// it may throw InvalidPathException for OS-specific illegal chars on Windows,
// but those are not reachable in production.
if (Paths.get(filename).isAbsolute()) return false;
return true;
}