Send 404 on `/{org}.gpg` (#18959)

routers/web/org/home.go

@@ -6,6 +6,7 @@ package org
 
 import (
 	"net/http"
+	"strings"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
@@ -23,7 +24,14 @@ const (
 
 // Home show organization home page
 func Home(ctx *context.Context) {
-	ctx.SetParams(":org", ctx.Params(":username"))
+	uname := ctx.Params(":username")
+
+	if strings.HasSuffix(uname, ".keys") || strings.HasSuffix(uname, ".gpg") {
+		ctx.NotFound("", nil)
+		return
+	}
+
+	ctx.SetParams(":org", uname)
 	context.HandleOrgAssignment(ctx)
 	if ctx.Written() {
 		return