# Missing Authentication for Critical Function (CWE-306)

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

**Stack:** JavaScript

- Prevalence: Wysoka Często wykorzystywana
- Impact: Wysoki 6 reguł o wysokim poziomie
- Prevention: Udokumentowane 6 przykładów poprawek

**OWASP:** Identification and Authentication Failures (A07:2021-Identification and Authentication Failures) - #7

## Description

As data traverses trust boundaries, the data should be validated before being processed. When authentication is not applied to critical functions, attackers can invoke these functions without proving their identity.

## Prevention

### JavaScript

Add @UseGuards decorator with authentication guard at controller or method level

## Warning Signs

- [HIGH] NestJS endpoint has no @UseGuards() decorator for authentication

## Consequences

- Uzyskanie uprawnień
- Odczyt danych aplikacji
- Modyfikacja danych aplikacji
- Wykonanie nieautoryzowanego kodu

## Mitigations

- Podziel oprogramowanie na komponenty o różnych poziomach zaufania
- Zidentyfikuj wszystkie obszary o funkcjonalności krytycznej dla bezpieczeństwa i wymagaj w nich uwierzytelnienia
- Zadbaj, by stosowano odpowiednie kontrole dostępu

## Detection

- Total rules: 6
- Languages: python, go, typescript

## Rules by Language

### Typescript (1 rules)

- **NestJS Endpoint Missing Authentication Guard** [HIGH]: Endpoints without @UseGuards or @Public decorators are accessible to
unauthenticated users, enabling unauthorized access.
  - Remediation: Add @UseGuards decorator at controller or method level.

```typescript
import { UseGuards } from '@nestjs/common';
import { JwtAuthGuard } from '../auth/jwt-auth.guard';

@Controller('users')
@UseGuards(JwtAuthGuard)
export class UsersController {
  @Get(':id')
  findOne(@Param('id') id: string) {
    return this.usersService.findOne(id);
  }
}
```

Learn more: https://shoulder.dev/learn/typescript/cwe-306/missing-auth-guard