Jason Woltje 01639fff95 feat(#285): Add input sanitization for XSS prevention ...

Security improvements:
- Create sanitization utility using sanitize-html library
- Add @Sanitize() and @SanitizeObject() decorators for DTOs
- Apply sanitization to vulnerable fields:
  - Connection rejection/disconnection reasons
  - Connection metadata
  - Identity linking metadata
  - Command payloads
- Remove script tags, event handlers, javascript: URLs
- Prevent data exfiltration, CSS-based XSS, SVG-based XSS

Changes:
- Add sanitize.util.ts with recursive sanitization functions
- Add sanitize.decorator.ts for class-transformer integration
- Update connection.dto.ts with sanitization decorators
- Update identity-linking.dto.ts with sanitization decorators
- Update command.dto.ts with sanitization decorators
- Add comprehensive test coverage including attack vectors

Part of M7.1 Remediation Sprint P1 security fixes.

Fixes #285

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-03 21:47:32 -06:00

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