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security: default metrics server to loopback

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Fixes unauthenticated metrics exposure by defaulting to 127.0.0.1 when
no host is provided. Logs a warning when bound to non-loopback addresses.
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Codescribe
2026-08-24 15:14:59 +07:00
committed by Cuong Manh Le
parent 0f310594b0
commit fffa621797
1 changed files with 16 additions and 0 deletions
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cmd/cli/metrics.go
+16
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@@ -120,6 +120,22 @@ func (p *prog) runMetricsServer(ctx context.Context, reloadCh chan struct{}) {
}
addr := p.cfg.Service.MetricsListener
if addr != "" {
host, port, err := net.SplitHostPort(addr)
if err != nil {
mainLog.Load().Warn().Err(err).Msgf("Invalid metrics listener address (%s); expected host:port", addr)
} else {
if host == "" {
host = "127.0.0.1"
addr = net.JoinHostPort(host, port)
}
ip := net.ParseIP(host)
if (ip != nil && !ip.IsLoopback()) || (ip == nil && host != "localhost") {
mainLog.Load().Warn().Msgf("Metrics server is bound to a non-loopback address (%s). This exposes sensitive data without authentication.", addr)
}
}
}
ms, err := newMetricsServer(addr, reg)
if err != nil {
mainLog.Load().Warn().Err(err).Msg("Could not create new metrics server")