From ece6fc2577e3e0d88c4203bc104a3f12ea5dabad Mon Sep 17 00:00:00 2001
From: colin <colin@git@nixc.us>
Date: Mon, 11 Nov 2024 22:50:37 -0500
Subject: [PATCH] nonce hacking

---
 docker/resume/nginx.conf | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/docker/resume/nginx.conf b/docker/resume/nginx.conf
index 3c9247c..c94860c 100644
--- a/docker/resume/nginx.conf
+++ b/docker/resume/nginx.conf
@@ -1,23 +1,40 @@
+# Use $request_id as a pseudo-nonce for Content Security Policy (CSP)
+# $request_id is unique per request and will serve as a nonce value here.
+
+# Map $request_id to a variable named $nonce
+map $request_id $nonce {
+    default "$request_id";
+}
+
 server {
     listen 8080;
     root /usr/share/nginx/html;
     index resume.html;
 
+    # Security headers
     add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
     add_header X-Frame-Options "SAMEORIGIN" always;
     add_header X-Content-Type-Options "nosniff" always;
     add_header Referrer-Policy "strict-origin-when-cross-origin" always;
     add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), accelerometer=(), gyroscope=(), magnetometer=(), payment=(), usb=()" always;
 
-    add_header Content-Security-Policy "default-src 'none'; script-src 'self' 'unsafe-inline' https://matomo.nixc.us; style-src 'self' 'unsafe-inline' https://colinknapp.com; img-src 'self' https://matomo.nixc.us https://colinknapp.com https://hedgedoc.nixc.us; font-src 'self' data:; frame-ancestors 'self'; base-uri 'self'; form-action 'self';" always;
+    # Content Security Policy (CSP) with injected $nonce for script-src
+    # Allows inline scripts that match the nonce generated for each request
+    add_header Content-Security-Policy "default-src 'none'; script-src 'self' 'nonce-$nonce' https://matomo.nixc.us; style-src 'self' 'unsafe-inline' https://colinknapp.com; img-src 'self' https://matomo.nixc.us https://colinknapp.com https://hedgedoc.nixc.us; font-src 'self' data:; frame-ancestors 'self'; base-uri 'self'; form-action 'self';" always;
 
+    # Cross-origin isolation headers
     add_header Cross-Origin-Embedder-Policy "require-corp" always;
     add_header Cross-Origin-Resource-Policy "same-origin" always;
     add_header Cross-Origin-Opener-Policy "same-origin" always;
 
+    # Use sub_filter to inject the nonce into inline <script> tags automatically
+    # This works for HTML responses where <script> tags are inline in the HTML
+    sub_filter '<script>' '<script nonce="$nonce">';
+    sub_filter_once off; # Apply the replacement to all instances of <script> tags
+    sub_filter_types text/html; # Only apply the sub_filter to HTML content
+
+    # Redirect demo.hedgedoc.org resources to hedgedoc.nixc.us for compatibility
     sub_filter "https://demo.hedgedoc.org" "https://hedgedoc.nixc.us";
-    sub_filter_once off;
-    sub_filter_types text/html application/javascript;
 
     location / {
         try_files $uri $uri/ =404;