v0.26.1 per-client connection caps

internal/sink/http/http.go

@@ -156,11 +156,15 @@ func NewHTTPSinkPlugin(
 	if err != nil {
 		return nil, err
 	}
-	authPolicy, err := authz.New(opts.Auth, tlsCfg, authz.RoleListener, authz.HTTP)
+	kind := netacl.HTTP
+	if opts.Auth != nil && len(opts.Auth.TrustedProxies) > 0 {
+		kind = netacl.HTTPProxied
+	}
+	aclPolicy, err := netacl.New(opts.ACL, opts.Host, kind, logger, "http_sink", id)
 	if err != nil {
 		return nil, err
 	}
-	aclPolicy, err := netacl.New(opts.ACL, opts.Host, logger, "http_sink", id)
+	authPolicy, err := authz.New(opts.Auth, tlsCfg, aclPolicy, authz.RoleListener, authz.HTTP)
 	if err != nil {
 		return nil, err
 	}
@@ -264,14 +268,16 @@ func (h *HTTPSink) serve(ctx context.Context, ln net.Listener) error {
 
 	// One wrapper covers stream and status, and keeps the handlers themselves
 	// unaware of authorization; a nil policy admits every request. Login, the
-	// browser files and the root sit outside it; in proxy mode everything sits
-	// behind the proxy gate.
+	// browser files and the root sit outside it; all but login, which SCRAM
+	// throttling limits, count in the per-client request rate. In proxy mode
+	// everything sits behind the proxy gate.
+	limit := func(next http.Handler) http.Handler { return h.acl.Requests(next, clientAddr) }
 	outer := http.NewServeMux()
 	outer.HandleFunc(http.MethodPost+" "+chain.AuthPath, h.handleAuth)
 	for p, file := range h.web {
-		outer.Handle(http.MethodGet+" "+p, file)
+		outer.Handle(http.MethodGet+" "+p, limit(file))
 	}
-	outer.Handle("/", h.authMiddleware(mux))
+	outer.Handle("/", limit(h.authMiddleware(mux)))
 	var handler http.Handler = outer
 	if h.auth.BehindProxy() {
 		handler = h.proxyGate(outer)
@@ -572,6 +578,7 @@ func (h *HTTPSink) armWrite(rc *http.ResponseController) {
 
 // handleStatus provides a JSON status report
 func (h *HTTPSink) handleStatus(w http.ResponseWriter, r *http.Request) {
+	denied, limited := h.acl.Refused()
 	status := map[string]any{
 		"service":     "LogWisp",
 		"version":     version.Short(),
@@ -599,7 +606,8 @@ func (h *HTTPSink) handleStatus(w http.ResponseWriter, r *http.Request) {
 			"dropped_writes":   h.droppedWrites.Load(),
 			"rejected_clients": h.rejectedClients.Load(),
 			"auth_rejected":    h.auth.Rejected(),
-			"acl_denied":       h.acl.Denied(),
+			"acl_denied":       denied,
+			"acl_limited":      limited,
 		},
 	}
 

internal/sink/http/web.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"embed"
+	"errors"
 	"html"
 	"net/http"
 	"path"
@@ -12,6 +13,7 @@ import (
 	"github.com/lixenwraith/logwisp/internal/authz"
 	"github.com/lixenwraith/logwisp/internal/chain"
 	"github.com/lixenwraith/logwisp/internal/config"
+	"github.com/lixenwraith/logwisp/internal/netacl"
 )
 
 //go:embed web/*.js web/*.html web/*.css
@@ -101,18 +103,21 @@ func serveWebFile(data []byte, contentType string) http.Handler {
 // clientKey carries the forwarded client address from proxyGate
 type clientKey struct{}
 
-// proxyGate admits only the trusted proxies, and records the client they
-// forward for logs and sessions. ServeAuth and AuthorizeRequest check again.
+// proxyGate admits only the trusted proxies, forwarding a client the acl
+// rules admit, and records that client for logs, sessions and the request
+// rate. ServeAuth and AuthorizeRequest check again.
 func (h *HTTPSink) proxyGate(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		addr, err := h.auth.ClientAddr(r)
 		if err != nil {
-			h.logger.Warn("msg", "Request refused: not through a trusted proxy over https",
-				"component", "http_sink",
-				"instance_id", h.id,
-				"remote_addr", r.RemoteAddr,
-				"path", r.URL.Path,
-				"error", err)
+			if !errors.Is(err, netacl.ErrDenied) { // reported by netacl, once a minute
+				h.logger.Warn("msg", "Request refused: not through a trusted proxy over https",
+					"component", "http_sink",
+					"instance_id", h.id,
+					"remote_addr", r.RemoteAddr,
+					"path", r.URL.Path,
+					"error", err)
+			}
 			authz.Refuse(w, http.StatusForbidden)
 			return
 		}