proper error message for kdbx 4.x files

.idea/codeStyles/Project.xml

@@ -0,0 +1,116 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.1
+
+- Throw unsupported exception when trying to read kdbx 4.x files.
+
 ## 0.2.0
 
 - Fixed writing of packet index for payload.

lib/src/kdbx_format.dart

@@ -304,6 +304,12 @@ class KdbxFormat {
   static KdbxFile read(Uint8List input, Credentials credentials) {
     final reader = ReaderHelper(input);
     final header = KdbxHeader.read(reader);
+    if (header.versionMajor != 3) {
+      _logger.finer('Unsupported version for $header');
+      throw KdbxUnsupportedException('Unsupported kdbx version '
+          '${header.versionMajor}.${header.versionMinor}.'
+          ' Only 3.x is supported.');
+    }
     return _loadV3(header, reader, credentials);
   }
 

lib/src/kdbx_header.dart

@@ -236,6 +236,11 @@ class KdbxHeader {
   ProtectedValueEncryption get innerRandomStreamEncryption =>
       ProtectedValueEncryption.values[ReaderHelper.singleUint32(
           fields[HeaderFields.InnerRandomStreamID].bytes)];
+
+  @override
+  String toString() {
+    return 'KdbxHeader{sig1: $sig1, sig2: $sig2, versionMajor: $versionMajor, versionMinor: $versionMinor}';
+  }
 }
 
 class KdbxException implements Exception {}
@@ -252,6 +257,11 @@ class KdbxUnsupportedException implements KdbxException {
   KdbxUnsupportedException(this.hint);
 
   final String hint;
+
+  @override
+  String toString() {
+    return 'KdbxUnsupportedException{hint: $hint}';
+  }
 }
 
 class HashedBlockReader {

pubspec.yaml

@@ -1,8 +1,7 @@
 name: kdbx
-description: KeepassX format implementation in pure dart. (kdbx 2.x support).
-version: 0.2.0
+description: KeepassX format implementation in pure dart. (kdbx 3.x support).
+version: 0.2.1
 homepage: https://github.com/authpass/kdbx.dart
-author: Herbert Poul <herbert@poul.at>
 
 environment:
   sdk: '>=2.4.0 <3.0.0'

test/kdbx_test.dart

@@ -91,4 +91,13 @@ void main() {
       File('test.kdbx').writeAsBytesSync(saved);
     });
   });
+
+  group('Unsupported version', () {
+    test('Fails with exception', () async {
+      final data = await File('test/keepassxcpasswords.kdbx').readAsBytes();
+      expect(() {
+        KdbxFormat.read(data, Credentials(ProtectedValue.fromString('asdf')));
+      }, throwsA(const TypeMatcher<KdbxUnsupportedException>()));
+    });
+  });
 }