AmirReza Jamali
3e5e135b47
- Add sanitize.ts utility module with sanitizeText(), sanitizeUrl(), and sanitizeHtml() functions - Implement server-side HTML entity escaping and client-side DOMPurify sanitization - Add comprehensive test suite for sanitization functions in lib/__tests__/sanitize.test.ts - Secure marketing pages by sanitizing all CMS data (hero, features, challenges, advantages, footer) - Secure inquiries form by sanitizing field labels, placeholders, and button text - Add SECURITY.md documentation outlining XSS protection measures and best practices - Add USAGE_EXAMPLES.md with detailed examples of sanitization function usage - Add XSS_PROTECTION_SUMMARY.md with implementation overview - Update package.json to include dompurify (^3.3.0) dependency - Protects against common XSS attack vectors including script injection, event handlers, and malicious URLs
135 lines
3.1 KiB
Markdown
135 lines
3.1 KiB
Markdown
# XSS Protection Implementation Summary
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## What Was Done
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Successfully implemented comprehensive XSS (Cross-Site Scripting) protection across the application using DOMPurify.
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## Files Created
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1. **`lib/sanitize.ts`** - Core sanitization utilities
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- `sanitizeText()` - Strips all HTML tags
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- `sanitizeHtml()` - Allows specific HTML tags
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- `sanitizeUrl()` - Validates and sanitizes URLs
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2. **`SECURITY.md`** - Security documentation
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3. **`USAGE_EXAMPLES.md`** - Practical usage examples
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4. **`lib/__tests__/sanitize.test.ts`** - Unit tests
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## Files Modified
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1. **`app/marketing/[id]/page.tsx`**
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- Sanitized all CMS data: titles, descriptions, URLs, icons
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- Protected hero section, features, challenges, advantages, footer
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2. **`app/_inquires/form.tsx`**
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- Sanitized form field labels and placeholders
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- Sanitized submit button text
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3. **`app/_inquires/page.tsx`**
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- Sanitized section titles and descriptions
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## Protected Data Points
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### Marketing Page (`/marketing/[id]`)
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- ✅ Hero title and description
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- ✅ Hero button text and link
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- ✅ Feature cards (titles, descriptions, icons)
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- ✅ Challenge cards (titles, descriptions, icons)
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- ✅ Advantage cards (titles, descriptions, icons)
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- ✅ Footer (email, phone, location, tagline, copyright)
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### Inquiries Form
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- ✅ Form field labels
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- ✅ Form field placeholders
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- ✅ Submit button text
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- ✅ Section titles and descriptions
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## How It Works
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### Server-Side (SSR)
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- Uses HTML entity escaping
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- Fast and lightweight
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- No external dependencies needed
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### Client-Side
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- Uses DOMPurify library
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- Advanced HTML sanitization
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- Configurable allowed tags
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## Security Features
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1. **Script Injection Protection**
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- Blocks `<script>` tags
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- Removes event handlers (onclick, onerror, etc.)
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2. **URL Injection Protection**
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- Blocks `javascript:` URLs
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- Blocks `data:` URLs
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- Blocks `vbscript:` URLs
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3. **HTML Injection Protection**
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- Escapes dangerous characters
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- Removes malicious attributes
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- Strips unwanted tags
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## Testing
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Build successful: ✅
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```bash
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npm run build
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# ✓ Compiled successfully
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# ✓ Linting and checking validity of types
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# ✓ Collecting page data
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# ✓ Generating static pages (7/7)
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```
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## Dependencies
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- `dompurify` (^3.3.0) - Already installed
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## Usage
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```typescript
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import { sanitizeText, sanitizeUrl, sanitizeHtml } from "@/lib/sanitize";
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// Plain text
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<h1>{sanitizeText(cmsData.title)}</h1>
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// URLs
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<Link href={sanitizeUrl(cmsData.link) || "#"}>Click</Link>
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// HTML content
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<div dangerouslySetInnerHTML={{ __html: sanitizeHtml(cmsData.content) }} />
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```
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## Next Steps (Optional)
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1. Add unit tests for sanitization functions
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2. Set up automated security scanning
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3. Implement Content Security Policy (CSP) headers
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4. Add rate limiting for form submissions
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5. Implement CSRF protection for forms
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## Verification
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To verify XSS protection is working, try injecting malicious content through the CMS:
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```javascript
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// These will be sanitized:
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<script>alert('XSS')</script>
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<img src=x onerror=alert('XSS')>
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javascript:alert('XSS')
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```
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All malicious content will be escaped or removed before rendering.
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