/**
* Go down the registry tree to find a key with the given name.
*
* @param root Root of the registry hive
* @param name Name of the subkey to seach for
* @return The matching subkey or null if not found
*/
public RegistryKey findKey(RegistryKey root, String name) {
RegistryKey currentKey = root;
// Split the key name into parts
String[] parts = name.split("\\\\");
for (String part : parts) {
if (part.length() > 0) {
try {
currentKey = currentKey.getSubkey(part);
} catch (Exception ex) {
// We get an exception if the value wasn't found (not a RegistryParseException).
// There doesn't seem to be a cleaner way to test for existance without cycling though
// everything ourselves. (Broad catch because things other than RegistryParseException
// can happen)
return null;
}
}
}
// If we make it this far, we've found it
return currentKey;
}
/**
* Test the Registry object against one registry file.
*
* @param a_regInfo The registry file
* @return Result of the test
*/
private ObservableResult testRegistryFile(RegistryFileInfo a_regInfo) {
try {
RegistryKey root = openRegistry(a_regInfo.tempFileName);
RegistryKey result = findKey(root, obj.getKey().getValue().toString());
if (result == null) {
// Take another shot looking for the key minus the first part of the path (sometimes the
// hive file name is here). This should only happen if the hive name started
// with "HKEY"
if ((obj.getHive() != null)
&& obj.getHive().getValue().toString().startsWith("HKEY")) { // NON-NLS
String[] parts = obj.getKey().getValue().toString().split("\\\\");
String newKey = "";
for (int i = 1; i < parts.length; i++) {
if (newKey.length() > 0) {
newKey += "\\";
}
newKey += parts[i];
}
result = findKey(root, newKey);
}
if (result == null) {
return new ObservableResult(
id,
"RegistryObject: Could not find key " + obj.getKey().getValue(), // NON-NLS
spacing,
ObservableResult.ObservableState.FALSE,
null);
}
}
if ((obj.getValues() == null) || (obj.getValues().getValues().isEmpty())) {
// No values to test
List<StixArtifactData> artData = new ArrayList<StixArtifactData>();
artData.add(
new StixArtifactData(a_regInfo.abstractFile.getId(), id, "Registry")); // NON-NLS
return new ObservableResult(
id,
"RegistryObject: Found key " + obj.getKey().getValue(), // NON-NLS
spacing,
ObservableResult.ObservableState.TRUE,
artData);
}
// Test all the values
for (org.mitre.cybox.objects.RegistryValueType stixRegValue : obj.getValues().getValues()) {
try {
for (RegistryValue valFromFile : result.getValueList()) {
// Test if the name field matches (if present)
boolean nameSuccess = true; // True if the name matches or isn't present
if (stixRegValue.getName() != null) {
try {
nameSuccess = compareStringObject(stixRegValue.getName(), valFromFile.getName());
} catch (UnsupportedEncodingException ex) {
nameSuccess = false;
}
}
boolean valueSuccess = true;
if (nameSuccess && (stixRegValue.getData() != null)) {
switch (valFromFile.getValueType()) {
case REG_SZ:
case REG_EXPAND_SZ:
try {
valueSuccess =
compareStringObject(
stixRegValue.getData(), valFromFile.getValue().getAsString());
} catch (UnsupportedEncodingException ex) {
valueSuccess = false;
}
break;
case REG_DWORD:
case REG_BIG_ENDIAN:
case REG_QWORD:
// Only support "equals" for now.
if ((stixRegValue.getData().getCondition() == null)
|| (stixRegValue.getData().getCondition() == ConditionTypeEnum.EQUALS)) {
// Try to convert the STIX string to a long
try {
long stixValue = Long.decode(stixRegValue.getData().getValue().toString());
try {
valueSuccess = (stixValue == valFromFile.getValue().getAsNumber());
} catch (UnsupportedEncodingException ex) {
valueSuccess = false;
}
} catch (NumberFormatException ex) {
// We probably weren't looking at a numeric field to begin with,
// so getting this exception isn't really an error.
valueSuccess = false;
}
} else {
valueSuccess = false;
}
break;
default:
// Nothing to do here. These are the types we don't handle:
// REG_BIN, REG_FULL_RESOURCE_DESCRIPTOR, REG_LINK, REG_MULTI_SZ, REG_NONE,
// REG_RESOURCE_LIST, REG_RESOURCE_REQUIREMENTS_LIST
}
}
if (nameSuccess && valueSuccess) {
// Found a match for all values
List<StixArtifactData> artData = new ArrayList<StixArtifactData>();
artData.add(
new StixArtifactData(a_regInfo.abstractFile.getId(), id, "Registry")); // NON-NLS
return new ObservableResult(
id,
"RegistryObject: Found key "
+ obj.getKey().getValue() // NON-NLS
+ " and value "
+ stixRegValue.getName().getValue().toString() // NON-NLS
+ " = "
+ stixRegValue.getData().getValue().toString(),
spacing,
ObservableResult.ObservableState.TRUE,
artData);
}
}
} catch (Exception ex) {
// Broad catch here becase the registry parser can create all kinds of exceptions beyond
// what it reports.
return new ObservableResult(
id,
"RegistryObject: Exception during evaluation: " + ex.getLocalizedMessage(), // NON-NLS
spacing,
ObservableResult.ObservableState.INDETERMINATE,
null);
}
}
} catch (TskCoreException ex) {
return new ObservableResult(
id,
"RegistryObject: Exception during evaluation: " + ex.getLocalizedMessage(), // NON-NLS
spacing,
ObservableResult.ObservableState.INDETERMINATE,
null);
}
return new ObservableResult(
id,
"RegistryObject: Not done", // NON-NLS
spacing,
ObservableResult.ObservableState.INDETERMINATE,
null);
}
