# 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: Alta Frequentemente explorada
- Impact: Alto 6 regras de severidade alta
- Prevention: Documentada 6 exemplos de correção

**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

- Obter privilégios
- Ler dados da aplicação
- Modificar dados da aplicação
- Executar código não autorizado

## Mitigations

- Divida o software em componentes com diferentes níveis de confiança
- Identifique todas as áreas com funcionalidades críticas para a segurança e exija autenticação em todas elas
- Garanta que controles de acesso apropriados sejam aplicados

## 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