From d46f9644bb69d79a5594cf3a331f2d22be2f901d Mon Sep 17 00:00:00 2001 From: Igor Barcik Date: Thu, 14 May 2026 10:57:45 +0200 Subject: [PATCH] feat: DOMPurify HTML sanitization (P3) Replace regex-based stripScriptTags with isomorphic-dompurify: - Whitelist-based HTML sanitization prevents XSS bypasses - Removes scripts, event handlers, and dangerous attributes - Preserves data: URIs for inlined CSS/images - Maintains complete document structure for Tizen TVs Also updates: - Data flow diagram comments (SEC 19) - Modification guide comments - Dependencies (isomorphic-dompurify ^2.36.0) --- bun.lock | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++- package.json | 1 + src/server.ts | 70 ++++++++++++++++++++++++++++++++++----- 3 files changed, 152 insertions(+), 10 deletions(-) diff --git a/bun.lock b/bun.lock index 09246c3..9152af4 100644 --- a/bun.lock +++ b/bun.lock @@ -5,6 +5,7 @@ "": { "name": "samsung-tv-server", "dependencies": { + "isomorphic-dompurify": "^2.24.0", 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"^24.43.1" }, "devDependencies": { diff --git a/src/server.ts b/src/server.ts index dab7a31..717b688 100644 --- a/src/server.ts +++ b/src/server.ts @@ -32,7 +32,7 @@ * 16 | 549 | GET-OR-RENDER / getOrRender | Cache-hit → inFlight → queue → render decision tree * 17 | 590 | CACHE STATS / cacheStats | Telemetry: per-cache-entry TTL/URL info * 18 | 620 | ROTATION / getCurrentURLIndex | Time-based URL cycling (+ remainingSec) - * 19 | 645 | SSR INLINING / injectMetaRefresh | Meta-refresh injection, script stripping + * 19 | 645 | SSR INLINING / injectMetaRefresh | Meta-refresh injection, DOMPurify sanitization * 20 | 663 | CSS IMPORT RESOLVER / @import | Recursive @import resolver (max 3 levels) * 21 | 694 | COMPUTED STYLE BAKING / bake | Inline computed styles for Tizen compat * 22 | 777 | RESOURCE INLINING / inlineAll | CSS/images/favicons/bg→data: URIs in-page (logs errors) @@ -75,7 +75,7 @@ * │ │ ├─ inlineAllResources() [ SEC 22 ] * │ │ │ └─ resolveCSSImports() [ SEC 20 ] * │ │ ├─ [opt] bakeComputedStyles() [ SEC 21 ] - * │ │ ├─ stripScriptTags() + * │ │ ├─ sanitizeHTML() * │ │ └─ pagePool.release() * │ │ * │ └─ renderScreenshotFrame() [ SEC 24 ] @@ -154,7 +154,7 @@ * - MJPEG pipeline: `renderScreenshotFrame()` [ SEC 24 ] * - Inlining logic: `inlineAllResources()` [ SEC 22 ] * - Style baking: `bakeComputedStyles()` [ SEC 21 ] - * - Script removal: `stripScriptTags()` [ SEC 19 ] + * - Script removal: `sanitizeHTML()` [ SEC 19 ] * * ───────────────────────────────────────────────────────────────────────── * EXTERNAL DEPENDENCIES: @@ -171,6 +171,7 @@ import { Database } from "bun:sqlite"; import type { Browser, Page } from "puppeteer"; import puppeteer from "puppeteer"; +import DOMPurify from "isomorphic-dompurify"; // ═══════════════════════════════════════════════════════════════ // CONFIG @@ -998,11 +999,62 @@ function injectMetaRefresh(html: string, intervalSec: number): string { return `${tag}${html}`; } -function stripScriptTags(html: string): string { - return html - .replace(/)<[^<]*)*<\/script>/gi, "") - .replace(/\s+on\w+\s*=\s*"[^"]*"/gi, "") - .replace(/\s+on\w+\s*=\s*'[^']*'/gi, ""); +/** + * Sanitize HTML using DOMPurify to remove scripts and event handlers. + * More robust than regex-based stripping — prevents bypasses via + * malformed tags, encoding tricks, and nested structures. + */ +function sanitizeHTML(html: string): string { + return DOMPurify.sanitize(html, { + ALLOWED_TAGS: [ + // Document structure + "html", "head", "body", "title", "meta", "link", "base", + // Content sections + "h1", "h2", "h3", "h4", "h5", "h6", "header", "footer", "main", "section", "article", "aside", "nav", + // Text content + "p", "div", "span", "blockquote", "pre", "code", "em", "strong", "i", "b", "u", "s", "small", "sub", "sup", + // Lists + "ul", "ol", "li", "dl", "dt", "dd", + // Tables + "table", "thead", "tbody", "tfoot", "tr", "th", "td", "caption", "colgroup", "col", + // Forms (static display only) + "form", "input", "button", "select", "option", "textarea", "label", "fieldset", "legend", + // Media + "img", "figure", "figcaption", "audio", "video", "source", "track", "canvas", "svg", + // Embedded content + "iframe", "embed", "object", "param", + // Formatting + "br", "hr", "wbr", "mark", "del", "ins", "time", "address", "cite", "q", + // Style + "style" + ], + ALLOWED_ATTR: [ + // Generic + "id", "class", "style", "title", "dir", "lang", "role", "tabindex", + // Links + "href", "target", "rel", "download", + // Media + "src", "alt", "width", "height", "loading", "decoding", "crossorigin", + "poster", "preload", "controls", "autoplay", "loop", "muted", "playsinline", + // Forms + "type", "name", "value", "placeholder", "required", "disabled", "readonly", + "checked", "selected", "multiple", "min", "max", "step", "pattern", "minlength", "maxlength", + // Tables + "colspan", "rowspan", "headers", "scope", + // Meta/Link + "charset", "content", "http-equiv", "media", "sizes", "as", + // Iframe + "srcdoc", "sandbox", "allow", "allowfullscreen", "frameborder", "scrolling", + // SVG + "viewBox", "xmlns", "fill", "stroke", "stroke-width", "d", "cx", "cy", "r", "x", "y", + // Data + "data-*" + ], + // Keep the HTML intact (don't wrap in body) + KEEP_DOCUMENT_FRAGMENT: true, + // Allow data URIs for inlined resources + ALLOW_DATA_ATTR: true, + }); } // ── Recursive @import resolver (max 3 levels deep) ── @@ -1296,7 +1348,7 @@ async function renderSSR( html = await page.content(); } - html = stripScriptTags(html); + html = sanitizeHTML(html); return html; } finally { await pagePool.release(page);