private static SafeCFArrayHandle EnumerateStore(
StoreLocation location,
StoreEnumerator userEnumerator,
StoreEnumerator machineEnumerator)
{
const int RetryLimit = 3;
int osStatus = 0;
// Occasionally calls to enumerate the trust list get errSecInvalidRecord.
// So, if we fail with result 0 ("see osStatus") just retry and see if the
// intermediate state has flushed itself.
for (int i = 0; i < RetryLimit; i++)
{
int result;
SafeCFArrayHandle matches;
if (location == StoreLocation.CurrentUser)
{
result = userEnumerator(out matches, out osStatus);
}
else if (location == StoreLocation.LocalMachine)
{
result = machineEnumerator(out matches, out osStatus);
}
else
{
Debug.Fail($"Unrecognized StoreLocation value: {location}");
throw new CryptographicException();
}
if (result == 1)
{
return(matches);
}
matches.Dispose();
if (result == 0)
{
// Instead of limiting it to particular error codes, just try it again.
// A permanent error will be stable, a temporary one will hopefully go away.
continue;
}
Debug.Fail($"Unexpected result from {location} trust store enumeration: {result}");
throw new CryptographicException();
}
throw CreateExceptionForOSStatus(osStatus);
}
private static SafeCFArrayHandle EnumerateStore(
StoreLocation location,
StoreEnumerator userEnumerator,
StoreEnumerator machineEnumerator)
{
int result;
SafeCFArrayHandle matches;
int osStatus;
if (location == StoreLocation.CurrentUser)
{
result = userEnumerator(out matches, out osStatus);
}
else if (location == StoreLocation.LocalMachine)
{
result = machineEnumerator(out matches, out osStatus);
}
else
{
Debug.Fail($"Unrecognized StoreLocation value: {location}");
throw new CryptographicException();
}
if (result == 1)
{
return(matches);
}
matches.Dispose();
if (result == 0)
{
throw CreateExceptionForOSStatus(osStatus);
}
Debug.Fail($"Unexpected result from {location} trust store enumeration: {result}");
throw new CryptographicException();
}
