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security(import): add isValidImportFilename guard and regression tests

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Codifies the path-traversal constraint that was previously safe by
accident (findFileRecursive's getFileName() strip) but had no explicit
guard or test coverage. Fixes issue #530.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-21 09:49:59 +02:00
parent 0c4b22291f
commit b63a2040e3
2 changed files with 67 additions and 0 deletions
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11
backend/src/main/java/org/raddatz/familienarchiv/importing/MassImportService.java
View File

@@ -320,6 +320,17 @@ public class MassImportService {
return new ProcessResult(processed, skippedFiles);
}
private boolean isValidImportFilename(String filename) {
if (filename == null || filename.isBlank()) return false;
if (filename.contains("/")) return false;
if (filename.contains("\\")) return false;
if (filename.contains("..")) return false;
if (filename.equals(".")) return false;
if (filename.contains("\0")) return false;
if (Paths.get(filename).isAbsolute()) return false;
return true;
}
// package-private: Mockito spy in tests can override to inject IOException
InputStream openFileStream(File file) throws IOException {
return new FileInputStream(file);

56
backend/src/test/java/org/raddatz/familienarchiv/importing/MassImportServiceTest.java
View File

@@ -438,6 +438,62 @@ class MassImportServiceTest {
verify(documentService).findByOriginalFilename("doc002.pdf");
}
// ─── isValidImportFilename — security regression — do not remove ─────────
@Test
void isValidImportFilename_returnsFalse_whenFilenameIsNull() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", (String) null);
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameIsBlank() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", " ");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameContainsForwardSlash() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "etc/passwd");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameContainsBackslash() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "..\\etc\\passwd");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameContainsDotDot() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "doc..evil.pdf");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameIsDotDot() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "..");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameIsAbsolutePath() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "/etc/passwd");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsFalse_whenFilenameContainsNullByte() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "file\0.pdf");
assertThat(result).isFalse();
}
@Test
void isValidImportFilename_returnsTrue_whenFilenameIsPlainBasename() {
boolean result = ReflectionTestUtils.invokeMethod(service, "isValidImportFilename", "document.pdf");
assertThat(result).isTrue();
}
// ─── importSingleDocument — non-blank optional fields ────────────────────
@Test