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🛡️ Sentinel: [HIGH] Fix XSS risk by enforcing strict CSP #28

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🛡️ Sentinel: [HIGH] Fix XSS risk by enforcing strict CSP #28

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20 changes: 2 additions & 18 deletions src/_includes/base.njk
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Original file line number Diff line number Diff line change
Expand Up @@ -3,24 +3,8 @@
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; object-src 'none'; base-uri 'self';">
<script>
/* Set theme before paint to avoid a flash: saved choice, else system preference.
Also emit a matching theme-color meta so the mobile browser chrome matches. */
(function () {
document.documentElement.classList.add('js');
var theme = 'dark';
try {
var saved = localStorage.getItem('theme');
theme = saved || (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
} catch (e) {}
document.documentElement.dataset.theme = theme;
var meta = document.createElement('meta');
meta.name = 'theme-color';
meta.content = theme === 'light' ? '#eef2f8' : '#070d19';
document.head.appendChild(meta);
})();
</script>
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; object-src 'none'; base-uri 'self';">
<script src="/assets/js/theme-init.js"></script>
<title>{{ title or site.title }}</title>
<meta name="description" content="{{ description or site.description }}">
<meta name="author" content="{{ site.author }}">
Expand Down
15 changes: 15 additions & 0 deletions src/assets/js/theme-init.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
/* Set theme before paint to avoid a flash: saved choice, else system preference.
Also emit a matching theme-color meta so the mobile browser chrome matches. */
(function () {
document.documentElement.classList.add('js');
var theme = 'dark';
try {
var saved = localStorage.getItem('theme');
theme = saved || (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
} catch (e) {}
document.documentElement.dataset.theme = theme;
var meta = document.createElement('meta');
meta.name = 'theme-color';
meta.content = theme === 'light' ? '#eef2f8' : '#070d19';
document.head.appendChild(meta);
})();