public static IEnumerable <RegistryObject> WalkHive(RegistryHive Hive, string startingKey = null)
{
Stack <RegistryKey> keys = new Stack <RegistryKey>();
RegistryKey x86_View = null, x64_View = null;
try
{
x86_View = RegistryKey.OpenBaseKey(Hive, RegistryView.Registry32);
}
catch (Exception e) when(
e is IOException ||
e is ArgumentException ||
e is UnauthorizedAccessException ||
e is System.Security.SecurityException)
{
}
try
{
x64_View = RegistryKey.OpenBaseKey(Hive, RegistryView.Registry32);
}
catch (Exception e) when(
e is IOException ||
e is ArgumentException ||
e is UnauthorizedAccessException ||
e is System.Security.SecurityException)
{
}
if (x86_View != null)
{
if (startingKey != null)
{
x86_View = x86_View.OpenSubKey(startingKey);
}
keys.Push(x86_View);
}
if (x64_View != null)
{
if (startingKey != null)
{
x64_View = x64_View.OpenSubKey(startingKey);
}
keys.Push(x64_View);
}
while (keys.Count > 0)
{
RegistryKey currentKey = keys.Pop();
if (currentKey == null)
{
continue;
}
if (Filter.IsFiltered(AsaHelpers.GetPlatformString(), "Scan", "Registry", "Key", currentKey.Name))
{
continue;
}
// First push all the new subkeys onto our stack.
foreach (string key in currentKey.GetSubKeyNames())
{
try
{
var next = currentKey.OpenSubKey(name: key, writable: false);
keys.Push(next);
}
// These are expected as we are running as administrator, not System.
catch (System.Security.SecurityException e)
{
Log.Verbose(e, "Permission Denied: {0}", currentKey.Name);
}
// There seem to be some keys which are listed as existing by the APIs but don't actually exist.
// Unclear if these are just super transient keys or what the other cause might be.
// Since this isn't user actionable, also just supress these to the verbose stream.
catch (System.IO.IOException e)
{
Log.Verbose(e, "Error Reading: {0}", currentKey.Name);
}
catch (Exception e)
{
Log.Information(e, "Unexpected error when parsing {0}:", currentKey.Name);
AsaTelemetry.TrackTrace(Microsoft.ApplicationInsights.DataContracts.SeverityLevel.Error, e);
}
}
var regObj = RegistryKeyToRegistryObject(currentKey);
if (regObj != null)
{
yield return(regObj);
}
}
x86_View.Dispose();
x64_View.Dispose();
}