public override void OnNewIncident(IIncidentLog newEntry)
{
//if login failed with user name that matches a login in database, we log this loginId in KeyId1
var failedUserName = newEntry.Key1;
if (string.IsNullOrWhiteSpace(failedUserName))
{
return;
}
var tenantId = newEntry.KeyId2;
var utcNow = _app.TimeService.UtcNow;
var session = _app.OpenSystemSession();
var fromDate = utcNow.Subtract(Settings.TimeWindow);
var strLoginFailed = LoginEventType.LoginFailed.ToString();
var qryRecentFailures = from lg in session.EntitySet <IIncidentLog>()
where lg.CreatedOn >= fromDate && lg.Key1 == failedUserName &&
lg.Type == LoginModule.LoginIncidentType && lg.SubType == strLoginFailed
select lg;
//Note: currently LINQ translator does not handle correctly comparing nullable values, so adding this separately
if (tenantId != null)
{
qryRecentFailures = qryRecentFailures.Where(lg => lg.KeyId2 == tenantId.Value);
}
var failCount = qryRecentFailures.Count();
if (failCount < Settings.FailureCount)
{
return; //not yet
}
// We have repeated login failures in short period of time; this might be an attack - suspend account(s) for several minutes
// find Login(s) - might be more than one - we may have the same username for different tenants
var loginSet = session.EntitySet <ILogin>();
var loginQuery = from lg in loginSet
where lg.UserName == failedUserName
select lg;
if (tenantId != null)
{
loginQuery = loginQuery.Where(lg => lg.TenantId == tenantId.Value);
}
var logins = loginQuery.ToList();
if (logins.Count == 0)
{
return; //it might happen if user name is not known
}
//Suspend login
var suspendedUntil = utcNow.Add(Settings.SuspensionPeriod);
var loginLogService = _app.GetService <ILoginLogService>();
var msg = StringHelper.SafeFormat("{0} login failures. Login {1} suspended until {2}", failCount, failedUserName, suspendedUntil);
var loginModule = _app.GetModule <LoginModule>();
foreach (var lg in logins)
{
// if already suspended or disabled, do not suspend again
if (lg.Flags.IsSet(LoginFlags.Disabled | LoginFlags.Suspended))
{
continue;
}
lg.Flags |= LoginFlags.Suspended;
lg.SuspendedUntil = suspendedUntil;
//raise event - it will log to login log
loginModule.OnLoginEvent(session.Context, LoginEventType.LoginSuspended, lg, msg, failedUserName);
}
session.SaveChanges();
var incService = _app.GetService <IIncidentLogService>();
incService.LogIncident(LoginModule.LoginIncidentType, msg, LoginEventType.LoginSuspended.ToString(), key1: failedUserName, keyId2: tenantId);
}