Merge pull request #299 from canonical/feat/add-sec-headers

feat: add security headers

pkg/ui/handlers.go

@@ -7,8 +7,9 @@ import (
 	"path"
 	"strings"
 
-	"github.com/canonical/identity-platform-login-ui/internal/logging"
 	"github.com/go-chi/chi/v5"
+
+	"github.com/canonical/identity-platform-login-ui/internal/logging"
 )
 
 const UI = "/ui"
@@ -19,8 +20,34 @@ type API struct {
 }
 
 func (a *API) RegisterEndpoints(mux *chi.Mux) {
+
+	uiHandlerWithHeaders := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Set the UI headers
+		// Disables the FLoC (Federated Learning of Cohorts) feature on the browser,
+		// preventing the current page from being included in the user's FLoC calculation.
+		// FLoC is a proposed replacement for third-party cookies to enable interest-based advertising.
+		w.Header().Set("Permissions-Policy", "interest-cohort=()")
+		// Prevents the browser from trying to guess the MIME type, which can have security implications.
+		// This tells the browser to strictly follow the MIME type provided in the Content-Type header.
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+		// Restricts the page from being displayed in a frame, iframe, or object to avoid click jacking attacks,
+		// but allows it if the site is navigating to the same origin.
+		w.Header().Set("X-Frame-Options", "SAMEORIGIN")
+		// Sets the Content Security Policy (CSP) for the page, which helps mitigate XSS attacks and data injection attacks.
+		// The policy allows loading resources (scripts, styles, images, etc.) only from the same origin ('self'), data URLs, and all subdomains of ubuntu.com.
+		w.Header().Set("Content-Security-Policy", "default-src 'self' data: https://*.ubuntu.com; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'")
+
+		// `no-store`: This will tell any cache system not to cache the index.html file
+		// `no-cache`: This will tell any cache system to check if there is a newer version in the server
+		// `must-revalidate`: This will tell any cache system to check for newer version of the file
+		// this is considered best practice with SPAs
+		w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+
+		a.uiFiles(w, r)
+	})
+
 	// TODO @shipperizer unsure if we deal with any POST/PUT/PATCH via js
-	mux.HandleFunc(fmt.Sprintf("%s/*", UI), a.uiFiles)
+	mux.HandleFunc(fmt.Sprintf("%s/*", UI), uiHandlerWithHeaders)
 
 }