Merge branch 'fix/200-mermaid-xss-protection' into develop
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237
apps/web/src/components/mindmap/MermaidViewer.test.tsx
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237
apps/web/src/components/mindmap/MermaidViewer.test.tsx
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@@ -0,0 +1,237 @@
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/**
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* MermaidViewer XSS Protection Tests
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* Tests defense-in-depth security layers for Mermaid diagram rendering
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*/
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import { describe, it, expect, vi, beforeEach } from "vitest";
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import { render, waitFor } from "@testing-library/react";
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import { MermaidViewer } from "./MermaidViewer";
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// Mock mermaid
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vi.mock("mermaid", () => ({
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default: {
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initialize: vi.fn(),
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render: vi.fn(),
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},
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}));
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describe("MermaidViewer XSS Protection", () => {
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beforeEach(() => {
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vi.clearAllMocks();
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});
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describe("Script tag injection", () => {
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it("should block script tags in labels", async () => {
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const maliciousDiagram = `graph TD
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A["<script>alert('XSS')</script>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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// Should not contain script tags
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expect(content).not.toContain("<script>");
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expect(content).not.toContain("alert");
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});
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});
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it("should block script tags with various casings", async () => {
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const maliciousDiagram = `graph TD
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A["<ScRiPt>alert('XSS')</sCrIpT>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML.toLowerCase();
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expect(content).not.toContain("<script>");
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});
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});
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});
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describe("Event handler injection", () => {
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it("should block onerror event handlers", async () => {
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const maliciousDiagram = `graph TD
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A["<img src=x onerror=alert(1)>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("onerror");
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expect(content).not.toContain("alert(1)");
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});
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});
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it("should block onclick event handlers", async () => {
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const maliciousDiagram = `graph TD
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A["<div onclick=alert(1)>Click</div>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("onclick");
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});
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});
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it("should block onload event handlers", async () => {
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const maliciousDiagram = `graph TD
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A["<body onload=alert(1)>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("onload");
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});
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});
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});
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describe("JavaScript URL injection", () => {
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it("should block javascript: URLs in href", async () => {
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const maliciousDiagram = `graph TD
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A["<a href='javascript:alert(1)'>Click</a>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("javascript:");
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});
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});
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it("should block javascript: URLs in src", async () => {
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const maliciousDiagram = `graph TD
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A["<img src='javascript:alert(1)'>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("javascript:");
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});
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});
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});
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describe("Data URL injection", () => {
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it("should block data URLs with scripts", async () => {
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const maliciousDiagram = `graph TD
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A["<img src='data:text/html,<script>alert(1)</script>'>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("data:text/html");
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expect(content).not.toContain("<script>");
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});
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});
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it("should block data URLs with base64 encoded scripts", async () => {
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const maliciousDiagram = `graph TD
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A["<object data='data:text/html;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg=='>"]`;
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|
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("data:text/html");
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});
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});
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});
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describe("SVG injection", () => {
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it("should block SVG with embedded scripts", async () => {
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const maliciousDiagram = `graph TD
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A["<svg><script>alert(1)</script></svg>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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// SVG should be sanitized to remove scripts
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expect(content).not.toContain("<script>");
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});
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});
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it("should block SVG with xlink:href", async () => {
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const maliciousDiagram = `graph TD
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A["<svg><use xlink:href='javascript:alert(1)'/></svg>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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expect(content).not.toContain("javascript:");
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});
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});
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});
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describe("HTML entity bypass", () => {
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it("should block HTML entity encoded scripts", async () => {
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const maliciousDiagram = `graph TD
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A["<script>alert(1)</script>"]`;
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const { container } = render(<MermaidViewer diagram={maliciousDiagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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// Should not execute the decoded script
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expect(content).not.toContain("alert(1)");
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});
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});
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});
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describe("Safe content", () => {
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it("should allow safe plain text labels", async () => {
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const safeDiagram = `graph TD
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A["Safe Label"]
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B["Another Safe Label"]
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A --> B`;
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const { container } = render(<MermaidViewer diagram={safeDiagram} />);
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await waitFor(() => {
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// Should render without errors
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expect(container.querySelector(".mermaid-container")).toBeTruthy();
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});
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});
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it("should allow safe special characters", async () => {
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const safeDiagram = `graph TD
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A["Label with & and # and @"]`;
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const { container } = render(<MermaidViewer diagram={safeDiagram} />);
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await waitFor(() => {
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expect(container.querySelector(".mermaid-container")).toBeTruthy();
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});
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});
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});
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describe("DOMPurify integration", () => {
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it("should sanitize rendered SVG output", async () => {
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const diagram = `graph TD
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A["Test Node"]`;
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// Mock mermaid to return SVG with potential XSS
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const mermaid = await import("mermaid");
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vi.mocked(mermaid.default.render).mockResolvedValue({
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svg: "<svg><script>alert(1)</script><text>Test</text></svg>",
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bindFunctions: vi.fn(),
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diagramType: "flowchart",
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});
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const { container } = render(<MermaidViewer diagram={diagram} />);
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await waitFor(() => {
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const content = container.innerHTML;
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// DOMPurify should remove the script tag
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expect(content).not.toContain("<script>");
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expect(content).not.toContain("alert(1)");
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// But keep the safe SVG elements
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expect(content).toContain("<svg");
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});
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});
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});
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});
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@@ -3,6 +3,7 @@
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import { useCallback, useEffect, useRef, useState } from "react";
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import mermaid from "mermaid";
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import DOMPurify from "dompurify";
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interface MermaidViewerProps {
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diagram: string;
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@@ -48,9 +49,27 @@ export function MermaidViewer({
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// Render the diagram
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const { svg } = await mermaid.render(id, diagram);
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// Sanitize SVG output with DOMPurify for defense-in-depth
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// Configure DOMPurify to allow SVG elements but remove scripts and dangerous attributes
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const sanitizedSvg = DOMPurify.sanitize(svg, {
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USE_PROFILES: { svg: true, svgFilters: true },
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ADD_TAGS: ["use"], // Allow SVG use elements
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FORBID_TAGS: ["script", "iframe", "object", "embed", "base"],
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FORBID_ATTR: [
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"onerror",
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"onload",
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"onclick",
|
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"onmouseover",
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"onfocus",
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"onblur",
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"onchange",
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"oninput",
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],
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});
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const container = containerRef.current;
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if (container) {
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container.innerHTML = svg;
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container.innerHTML = sanitizedSvg;
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// Add click handlers to nodes if callback provided
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if (onNodeClick) {
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@@ -121,6 +121,35 @@ interface UseGraphDataResult {
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const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? "http://localhost:8000";
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/**
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* Sanitize labels for Mermaid diagrams to prevent XSS
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* Removes HTML tags, dangerous protocols, and special characters
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*/
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function sanitizeMermaidLabel(label: string): string {
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if (!label) return "";
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// Remove HTML tags
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let sanitized = label.replace(/<[^>]*>/g, "");
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|
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// Remove dangerous protocols
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sanitized = sanitized.replace(/javascript:/gi, "");
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sanitized = sanitized.replace(/data:/gi, "");
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sanitized = sanitized.replace(/vbscript:/gi, "");
|
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|
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// Remove control characters
|
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// eslint-disable-next-line no-control-regex
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sanitized = sanitized.replace(/[\x00-\x1F\x7F]/g, "");
|
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|
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// Escape Mermaid special characters that could break syntax
|
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sanitized = sanitized.replace(/["\n\r]/g, " ");
|
||||
sanitized = sanitized.replace(/[[\](){}]/g, "");
|
||||
|
||||
// Truncate to prevent DoS
|
||||
sanitized = sanitized.slice(0, 200);
|
||||
|
||||
return sanitized.trim();
|
||||
}
|
||||
|
||||
async function apiFetch<T>(
|
||||
endpoint: string,
|
||||
accessToken: string | null,
|
||||
@@ -311,35 +340,35 @@ export function useGraphData(options: UseGraphDataOptions = {}): UseGraphDataRes
|
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nodesByType[nodeType].push(node);
|
||||
});
|
||||
|
||||
// Add nodes by type
|
||||
// Add nodes by type with sanitized labels
|
||||
Object.entries(nodesByType).forEach(([type, nodes]): void => {
|
||||
diagram += ` ${type}\n`;
|
||||
diagram += ` ${sanitizeMermaidLabel(type)}\n`;
|
||||
nodes.forEach((node): void => {
|
||||
diagram += ` ${node.title}\n`;
|
||||
diagram += ` ${sanitizeMermaidLabel(node.title)}\n`;
|
||||
});
|
||||
});
|
||||
} else {
|
||||
diagram = "graph TD\n";
|
||||
|
||||
// Add all edges
|
||||
// Add all edges with sanitized labels
|
||||
graph.edges.forEach((edge): void => {
|
||||
const source = graph.nodes.find((n): boolean => n.id === edge.source_id);
|
||||
const target = graph.nodes.find((n): boolean => n.id === edge.target_id);
|
||||
|
||||
if (source && target) {
|
||||
const sourceLabel = source.title.replace(/["\n]/g, " ");
|
||||
const targetLabel = target.title.replace(/["\n]/g, " ");
|
||||
const sourceLabel = sanitizeMermaidLabel(source.title);
|
||||
const targetLabel = sanitizeMermaidLabel(target.title);
|
||||
diagram += ` ${edge.source_id}["${sourceLabel}"] --> ${edge.target_id}["${targetLabel}"]\n`;
|
||||
}
|
||||
});
|
||||
|
||||
// Add standalone nodes (no edges)
|
||||
// Add standalone nodes (no edges) with sanitized labels
|
||||
graph.nodes.forEach((node): void => {
|
||||
const hasEdge = graph.edges.some(
|
||||
(e): boolean => e.source_id === node.id || e.target_id === node.id
|
||||
);
|
||||
if (!hasEdge) {
|
||||
const label = node.title.replace(/["\n]/g, " ");
|
||||
const label = sanitizeMermaidLabel(node.title);
|
||||
diagram += ` ${node.id}["${label}"]\n`;
|
||||
}
|
||||
});
|
||||
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/MermaidViewer.test.tsx
|
||||
**Tool Used:** Write
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:53:43
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-MermaidViewer.test.tsx_20260203-2253_1_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/MermaidViewer.test.tsx
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:54:56
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-MermaidViewer.test.tsx_20260203-2254_1_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/MermaidViewer.test.tsx
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:55:06
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-MermaidViewer.test.tsx_20260203-2255_1_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/MermaidViewer.tsx
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:54:02
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-MermaidViewer.tsx_20260203-2254_1_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/MermaidViewer.tsx
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 2
|
||||
**Generated:** 2026-02-03 22:54:09
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-MermaidViewer.tsx_20260203-2254_2_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/hooks/useGraphData.ts
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:54:26
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-hooks-useGraphData.ts_20260203-2254_1_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/hooks/useGraphData.ts
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 2
|
||||
**Generated:** 2026-02-03 22:54:39
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-hooks-useGraphData.ts_20260203-2254_2_remediation_needed.md"
|
||||
```
|
||||
@@ -0,0 +1,20 @@
|
||||
# QA Remediation Report
|
||||
|
||||
**File:** /home/jwoltje/src/mosaic-stack/apps/web/src/components/mindmap/hooks/useGraphData.ts
|
||||
**Tool Used:** Edit
|
||||
**Epic:** general
|
||||
**Iteration:** 1
|
||||
**Generated:** 2026-02-03 22:55:51
|
||||
|
||||
## Status
|
||||
|
||||
Pending QA validation
|
||||
|
||||
## Next Steps
|
||||
|
||||
This report was created by the QA automation hook.
|
||||
To process this report, run:
|
||||
|
||||
```bash
|
||||
claude -p "Use Task tool to launch universal-qa-agent for report: /home/jwoltje/src/mosaic-stack/docs/reports/qa-automation/pending/home-jwoltje-src-mosaic-stack-apps-web-src-components-mindmap-hooks-useGraphData.ts_20260203-2255_1_remediation_needed.md"
|
||||
```
|
||||
83
docs/scratchpads/200-mermaid-xss-enhancement.md
Normal file
83
docs/scratchpads/200-mermaid-xss-enhancement.md
Normal file
@@ -0,0 +1,83 @@
|
||||
# Issue #200: Enhance Mermaid XSS protection with DOMPurify
|
||||
|
||||
## Objective
|
||||
|
||||
Add defense-in-depth security layers to Mermaid rendering:
|
||||
|
||||
1. DOMPurify SVG sanitization
|
||||
2. Input sanitization for labels
|
||||
3. Comprehensive XSS attack testing
|
||||
|
||||
## Current State
|
||||
|
||||
- Core XSS protection already in place (strict mode, htmlLabels: false)
|
||||
- Issue #190 fixed critical vulnerability
|
||||
- Need to add additional security layers for defense-in-depth
|
||||
|
||||
## Approach
|
||||
|
||||
1. Check if DOMPurify is installed, install if needed
|
||||
2. Add DOMPurify SVG sanitization in MermaidViewer
|
||||
3. Add sanitizeMermaidLabel() function in useGraphData
|
||||
4. Write comprehensive XSS tests (TDD)
|
||||
5. Verify all attack vectors are blocked
|
||||
|
||||
## Implementation Plan
|
||||
|
||||
- [x] Create scratchpad
|
||||
- [x] Check/install DOMPurify (already installed)
|
||||
- [x] Write XSS attack tests (TDD - RED)
|
||||
- [x] Add DOMPurify to MermaidViewer
|
||||
- [x] Add label sanitization to useGraphData
|
||||
- [x] Run tests (GREEN) - 15/15 tests passing
|
||||
- [x] Verify type checking passing
|
||||
- [x] Commit and close issue
|
||||
|
||||
## Changes Made
|
||||
|
||||
### MermaidViewer.tsx
|
||||
|
||||
- Imported DOMPurify
|
||||
- Added SVG sanitization with DOMPurify after mermaid.render()
|
||||
- Configured DOMPurify with SVG profile
|
||||
- Forbidden tags: script, iframe, object, embed, base
|
||||
- Forbidden attributes: onerror, onload, onclick, etc.
|
||||
|
||||
### useGraphData.ts
|
||||
|
||||
- Added `sanitizeMermaidLabel()` function
|
||||
- Removes HTML tags
|
||||
- Removes dangerous protocols (javascript:, data:, vbscript:)
|
||||
- Removes control characters
|
||||
- Escapes Mermaid special characters
|
||||
- Truncates to 200 chars for DoS prevention
|
||||
- Applied to all labels in mindmap and flowchart generation
|
||||
|
||||
### MermaidViewer.test.tsx (new)
|
||||
|
||||
- 15 comprehensive XSS tests
|
||||
- Tests script tag injection
|
||||
- Tests event handler injection (onerror, onclick, onload)
|
||||
- Tests JavaScript URL injection
|
||||
- Tests data URL injection
|
||||
- Tests SVG with embedded scripts
|
||||
- Tests HTML entity bypass attempts
|
||||
- Tests DOMPurify integration
|
||||
- Tests safe content rendering
|
||||
|
||||
All 15 tests passing!
|
||||
|
||||
## Test Cases
|
||||
|
||||
1. Script tags in labels: `<script>alert(1)</script>`
|
||||
2. Event handlers: `<img src=x onerror=alert(1)>`
|
||||
3. JavaScript URLs: `javascript:alert(1)`
|
||||
4. Data URLs: `data:text/html,<script>alert(1)</script>`
|
||||
5. SVG with embedded scripts
|
||||
6. HTML entities bypass attempts
|
||||
|
||||
## Files to Modify
|
||||
|
||||
- apps/web/src/components/mindmap/MermaidViewer.tsx
|
||||
- apps/web/src/components/mindmap/hooks/useGraphData.ts
|
||||
- apps/web/src/components/mindmap/MermaidViewer.test.tsx (new)
|
||||
Reference in New Issue
Block a user