How to fix Insufficient Logging & Monitoring
in ServiceStack
Executive Summary
In ServiceStack, 'flying blind' is a death sentence. Default configurations often lack the granularity needed to detect credential stuffing, API abuse, or lateral movement. If your logs don't capture the 'who, what, where, and when' of failed security checks, you're not just vulnerable—you're already compromised and don't know it. We need structured, high-fidelity telemetry to feed into a SIEM for real-time alerting.
The Vulnerable Pattern
public class AuthService : Service
{
public object Post(Auth request)
{
// VULNERABILITY: No logging on authentication attempts.
// If an attacker tries 10,000 passwords, there is no record.
// No visibility into source IP or user-agent for forensic analysis.
try {
var response = Authenticate(request);
return response;
} catch (Exception) {
return new HttpError(HttpStatusCode.Unauthorized, "Fail");
}
}
}The Secure Implementation
Fixing insufficient logging in ServiceStack requires three layers: 1) The RequestLogsFeature plugin for a full audit trail of all API interactions. 2) Explicit logging of high-value security events (Logins, MFA, Password Changes) using GlobalRequestFilters to ensure metadata like RemoteIp is captured. 3) Structured logging output (e.g., JSON via Serilog) to ensure logs can be parsed by tools like ELK or Splunk. Crucially, sensitive data like cleartext passwords must be filtered out of logs using ExcludeRequestDtoTypes to prevent log-based credential leaks.
public override void Configure(Container container) { // 1. Enable Structured Request Logging Plugins.Add(new RequestLogsFeature { RequestLogger = new NetCoreLogFactory(LogManager.GetLogger(typeof(RequestLogsFeature))).CreateLogger(), EnableResponseTracking = true, EnableErrorTracking = true, ExcludeRequestDtoTypes = new[] { typeof(Authenticate) }, // Don't log raw passwords RequestLogFilter = (req, res, dto, entry) => { entry.Items["UserIp"] = req.RemoteIp; entry.Items["UserAgent"] = req.UserAgent; } });// 2. Global Security Event Interception this.GlobalRequestFilters.Add((req, res, dto) => { if (dto is Authenticate auth) { Log.Info($"AUTH_ATTEMPT|User:{auth.UserName}|IP:{req.RemoteIp}|UA:{req.UserAgent}"); } }); // 3. Centralized Exception Logging this.ServiceExceptionHandlers.Add((req, requestDto, ex) => { Log.Error($"SECURITY_EXCEPTION|Type:{ex.GetType().Name}|Path:{req.PathInfo}|IP:{req.RemoteIp}", ex); return null; // continue to default processing });
}
Your ServiceStack API
might be exposed to Insufficient Logging & Monitoring
74% of ServiceStack apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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