)]}'
{
  "commit": "53ab24547cd684fc38254a6bd63759d7121ca7d6",
  "tree": "15122689ee81490ea8d3497b6baade986c6bad2c",
  "parents": [
    "16098932295e067fb0a6b3ca2082b0d4b06027b4"
  ],
  "author": {
    "name": "Philip Zeyliger",
    "email": "philip@bold.dev",
    "time": "Wed Jun 04 17:49:33 2025 +0000"
  },
  "committer": {
    "name": "Autoformatter",
    "email": "bot@sketch.dev",
    "time": "Wed Jun 04 18:10:57 2025 +0000"
  },
  "message": "webui: implement DOMPurify sanitization for markdown security\n\nImplement comprehensive HTML sanitization using DOMPurify library to\nprevent XSS vulnerabilities in markdown rendering while preserving\nfull markdown functionality.\n\nProblem Analysis:\nChat timeline and tool card components used markdown rendering with\nunsafeHTML directive and no HTML sanitization, creating security risks:\n- Raw HTML from user input could execute arbitrary JavaScript\n- Script tags, event handlers, and dangerous elements passed through\n- marked.js default configuration allows HTML passthrough\n- No protection against malicious content in conversation history\n\nSecurity Solution - DOMPurify Implementation:\nFollowing marked.js documentation recommendations, implemented industry-standard\nDOMPurify library for comprehensive HTML sanitization using whitelist approach.\n\nDOMPurify Security Advantages:\n- Industry-standard library with regular security updates\n- Comprehensive whitelist-based sanitization approach\n- Automatically handles new XSS attack vectors as they emerge\n- Completely removes dangerous elements rather than escaping\n- Configurable allowlists for specific use case requirements\n- Battle-tested across millions of applications\n\nImplementation Changes:\n\n1. Package Dependencies:\n   - Added dompurify package dependency to webui/package.json\n   - DOMPurify includes built-in TypeScript definitions\n   - Leveraged existing transitive dependency through mermaid\n\n2. Enhanced sketch-timeline-message.ts Security:\n   - Integrated DOMPurify.sanitize() for HTML sanitization\n   - Configured allowlist for safe HTML elements (p, strong, code, etc.)\n   - Added support for mermaid diagram elements (svg, path, etc.)\n   - Included code block functionality attributes (data-*, class, id)\n   - Maintained existing mermaid diagram and code block functionality\n\n3. Enhanced sketch-tool-card.ts Security:\n   - Implemented DOMPurify sanitization in shared renderMarkdown utility\n   - Configured appropriate allowlist for tool card content display\n   - Simplified implementation using default marked.js settings\n   - Maintained backward compatibility with existing tool components\n\n4. DOMPurify Configuration:\n   - ALLOWED_TAGS: Comprehensive list of safe HTML elements\n   - ALLOWED_ATTR: Specific attributes for links, styling, functionality\n   - ALLOW_DATA_ATTR: true for code copy buttons and interactions\n   - KEEP_CONTENT: true to preserve text content and formatting\n\nSecurity Verification:\n- All dangerous HTML completely removed (script, iframe, object, etc.)\n- Event handlers stripped from elements (onload, onerror, onclick)\n- JavaScript URLs neutralized (javascript: protocol blocked)\n- XSS attack vectors comprehensively mitigated through allowlist approach\n- Edge cases handled automatically by library security updates\n\nFunctional Verification:\n- Markdown formatting fully preserved (bold, italic, code, links)\n- Code blocks render correctly with syntax highlighting classes\n- Mermaid diagrams continue working with required SVG elements\n- Copy-to-clipboard functionality maintained with data attributes\n- All existing chat timeline and tool card features functional\n\nTechnical Benefits:\n- Reduced maintenance burden - no custom escaping logic to maintain\n- Automatic protection against new attack vectors via library updates\n- Industry-standard approach following marked.js documentation recommendations\n- Comprehensive allowlist prevents unknown dangerous elements\n- Better performance through optimized library implementation\n\nTesting:\n- Verified all XSS attack vectors safely handled through comprehensive tests\n- Confirmed markdown functionality preserved across all components\n- Build process succeeds without TypeScript errors\n- Comprehensive security test suite validates sanitization effectiveness\n\nThis implementation follows security best practices recommended by marked.js\ndocumentation and provides robust protection against HTML injection attacks\nwhile maintaining full markdown functionality and user experience quality.\n\nCo-Authored-By: sketch \u003chello@sketch.dev\u003e\nChange-ID: s233c12c6daac5bb0k\n",
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