private void SessionManager_AuthenticationFailed(object sender, GenericEventArgs <AuthenticationRequest> e)
{
var config = Plugin.Instance.Configuration;
if (!config.EnableFirewallBlock)
{
return;
}
if (IsLocalNetworkIp(e.Argument.RemoteAddress) && config.IgnoreInternalFailedLoginAttempts)
{
return;
}
var connection = CheckConnectionAttempt(e.Argument, config).Result;
if (!connection.IsBanned)
{
return;
}
if (config.BannedConnections.Exists(c => c == connection))
{
return;
}
connection.BannedDateTime = DateTime.Now;
connection.IsBanned = true;
connection.RuleName = "Emby_Authentication_Request_Blocked_" + config.RuleNameCount;
connection.Id = "Emby_Authentication_Request_Blocked_" + config.RuleNameCount;
config.RuleNameCount += 1;
config.BannedConnections.Add(connection);
Plugin.Instance.UpdateConfiguration(config);
var result = FirewallController.AddFirewallRule(connection);
Logger.Info($"Firewall Rule {connection.RuleName} added for Ip {connection.Ip} - {result}");
ActivityManager.Create(new ActivityLogEntry()
{
Date = connection.BannedDateTime,
Id = Convert.ToInt64(000 + config.RuleNameCount),
Name = "Firewall Blocked Ip",
Severity = LogSeverity.Warn,
Overview = $"{connection.Ip} blocked: too many failed login attempts on {connection.UserAccountName}'s account, from ISP: {connection.Isp}, on device {connection.DeviceName}",
ShortOverview = $"{connection.Ip}: too many failed login attempts.",
Type = "Alert"
});
//Remove the connection data from our ConnectionAttemptLog list because they are banned. We no longer have to track their attempts
FailedAuthenticationAudit.Remove(connection);
SessionManager.SendMessageToAdminSessions("FirewallAdded", connection, CancellationToken.None);
}
private async Task <Connection> CheckConnectionAttempt(AuthenticationRequest authenticationRequest, PluginConfiguration config)
{
Connection connection = null;
if (FailedAuthenticationAudit.Exists(a => Equals(a.Ip, authenticationRequest.RemoteAddress.ToString())))
{
connection = FailedAuthenticationAudit.FirstOrDefault(c => Equals(c.Ip, authenticationRequest.RemoteAddress.ToString()));
var connectionLoginAttemptThreshold = config.ConnectionAttemptsBeforeBan != 0 ? config.ConnectionAttemptsBeforeBan : 3;
//If this connection has tried and failed, and is not Banned - but has waited over thirty seconds to try again - reset the attempt count and clear FailedAuthDateTimes List.
if (DateTime.UtcNow > connection?.FailedAuthDateTimes.LastOrDefault().AddSeconds(30))
{
connection.FailedAuthDateTimes.Clear();
connection.LoginAttempts = 0;
}
//Log the attempt
if (connection?.LoginAttempts < connectionLoginAttemptThreshold)
{
connection.LoginAttempts += 1;
connection.FailedAuthDateTimes.Add(DateTime.UtcNow);
return(connection);
}
//Tried to many times in a row, and too quickly -Ban the IP - could be a brute force attack.
if (connection?.FailedAuthDateTimes.FirstOrDefault() > DateTime.UtcNow.AddSeconds(-30))
{
connection.IsBanned = true;
return(connection);
}
}
else
{
ReverseLookupData targetData = null;
if (Plugin.Instance.Configuration.EnableGeoIp && !IsLocalNetworkIp(authenticationRequest.RemoteAddress))
{
targetData = await Target.GetLocation(authenticationRequest.RemoteAddress.ToString());
}
// ReSharper disable once ComplexConditionExpression
connection = new Connection
{
FlagIconUrl = targetData is null ? string.Empty : targetData.countryFlag,
Isp = targetData is null ? string.Empty : targetData.isp,
Ip = authenticationRequest.RemoteAddress.ToString(),
DeviceName = authenticationRequest.DeviceName,
UserAccountName = authenticationRequest.Username,
Proxy = targetData?.proxy ?? false,
ServiceProvider = targetData is null ? string.Empty : targetData.isp,
Longitude = targetData?.lon ?? 0,
Latitude = targetData?.lat ?? 0,
LoginAttempts = 1,
IsBanned = false,
Region = targetData?.regionName ?? string.Empty,
FailedAuthDateTimes = new List <DateTime> {
DateTime.UtcNow
}
};
FailedAuthenticationAudit.Add(connection);
}
return(connection);
}