springboot-security
Buenas prácticas de Spring Security para autenticación/autorización, validación, CSRF, secretos, cabeceras, limitación de velocidad y seguridad de dependencias en servicios Java Spring Boot.
What this skill does
# Revisión de Seguridad Spring Boot
Usar al agregar autenticación, manejar entradas, crear endpoints o trabajar con secretos.
## Cuándo Activar
- Agregar autenticación (JWT, OAuth2, basada en sesión)
- Implementar autorización (@PreAuthorize, control de acceso basado en roles)
- Validar entrada de usuario (Bean Validation, validadores personalizados)
- Configurar CORS, CSRF o cabeceras de seguridad
- Gestionar secretos (Vault, variables de entorno)
- Agregar limitación de velocidad o protección contra fuerza bruta
- Escanear dependencias por CVEs
## Autenticación
- Preferir JWT sin estado o tokens opacos con lista de revocación
- Usar cookies `httpOnly`, `Secure`, `SameSite=Strict` para sesiones
- Validar tokens con `OncePerRequestFilter` o resource server
```java
@Component
public class JwtAuthFilter extends OncePerRequestFilter {
private final JwtService jwtService;
public JwtAuthFilter(JwtService jwtService) {
this.jwtService = jwtService;
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
FilterChain chain) throws ServletException, IOException {
String header = request.getHeader(HttpHeaders.AUTHORIZATION);
if (header != null && header.startsWith("Bearer ")) {
String token = header.substring(7);
Authentication auth = jwtService.authenticate(token);
SecurityContextHolder.getContext().setAuthentication(auth);
}
chain.doFilter(request, response);
}
}
```
## Autorización
- Habilitar seguridad de métodos: `@EnableMethodSecurity`
- Usar `@PreAuthorize("hasRole('ADMIN')")` o `@PreAuthorize("@authz.canEdit(#id)")`
- Denegar por defecto; exponer solo los scopes requeridos
```java
@RestController
@RequestMapping("/api/admin")
public class AdminController {
@PreAuthorize("hasRole('ADMIN')")
@GetMapping("/users")
public List<UserDto> listUsers() {
return userService.findAll();
}
@PreAuthorize("@authz.isOwner(#id, authentication)")
@DeleteMapping("/users/{id}")
public ResponseEntity<Void> deleteUser(@PathVariable Long id) {
userService.delete(id);
return ResponseEntity.noContent().build();
}
}
```
## Validación de Entrada
- Usar Bean Validation con `@Valid` en controllers
- Aplicar restricciones en DTOs: `@NotBlank`, `@Email`, `@Size`, validadores personalizados
- Sanitizar cualquier HTML con lista blanca antes de renderizar
```java
// MAL: Sin validación
@PostMapping("/users")
public User createUser(@RequestBody UserDto dto) {
return userService.create(dto);
}
// BIEN: DTO validado
public record CreateUserDto(
@NotBlank @Size(max = 100) String name,
@NotBlank @Email String email,
@NotNull @Min(0) @Max(150) Integer age
) {}
@PostMapping("/users")
public ResponseEntity<UserDto> createUser(@Valid @RequestBody CreateUserDto dto) {
return ResponseEntity.status(HttpStatus.CREATED)
.body(userService.create(dto));
}
```
## Prevención de Inyección SQL
- Usar repositorios de Spring Data o consultas parametrizadas
- Para consultas nativas, usar bindings `:param`; nunca concatenar cadenas
```java
// MAL: Concatenación de cadenas en consulta nativa
@Query(value = "SELECT * FROM users WHERE name = '" + name + "'", nativeQuery = true)
// BIEN: Consulta nativa parametrizada
@Query(value = "SELECT * FROM users WHERE name = :name", nativeQuery = true)
List<User> findByName(@Param("name") String name);
// BIEN: Consulta derivada de Spring Data (auto-parametrizada)
List<User> findByEmailAndActiveTrue(String email);
```
## Codificación de Contraseñas
- Siempre hashear contraseñas con BCrypt o Argon2 — nunca almacenar en texto plano
- Usar el bean `PasswordEncoder`, no hashing manual
```java
@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder(12); // factor de costo 12
}
// En el servicio
public User register(CreateUserDto dto) {
String hashedPassword = passwordEncoder.encode(dto.password());
return userRepository.save(new User(dto.email(), hashedPassword));
}
```
## Protección CSRF
- Para aplicaciones de sesión de navegador, mantener CSRF habilitado; incluir token en formularios/cabeceras
- Para APIs puras con tokens Bearer, deshabilitar CSRF y depender de autenticación sin estado
```java
http
.csrf(csrf -> csrf.disable())
.sessionManagement(sm -> sm.sessionCreationPolicy(SessionCreationPolicy.STATELESS));
```
## Gestión de Secretos
- Sin secretos en el código fuente; cargar desde entorno o vault
- Mantener `application.yml` libre de credenciales; usar marcadores de posición
- Rotar tokens y credenciales de base de datos regularmente
```yaml
# MAL: Hardcodeado en application.yml
spring:
datasource:
password: mySecretPassword123
# BIEN: Marcador de variable de entorno
spring:
datasource:
password: ${DB_PASSWORD}
# BIEN: Integración con Spring Cloud Vault
spring:
cloud:
vault:
uri: https://vault.example.com
token: ${VAULT_TOKEN}
```
## Cabeceras de Seguridad
```java
http
.headers(headers -> headers
.contentSecurityPolicy(csp -> csp
.policyDirectives("default-src 'self'"))
.frameOptions(HeadersConfigurer.FrameOptionsConfig::sameOrigin)
.xssProtection(Customizer.withDefaults())
.referrerPolicy(rp -> rp.policy(ReferrerPolicyHeaderWriter.ReferrerPolicy.NO_REFERRER)));
```
## Configuración de CORS
- Configurar CORS a nivel del filtro de seguridad, no por controller
- Restringir orígenes permitidos — nunca usar `*` en producción
```java
@Bean
public CorsConfigurationSource corsConfigurationSource() {
CorsConfiguration config = new CorsConfiguration();
config.setAllowedOrigins(List.of("https://app.example.com"));
config.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE"));
config.setAllowedHeaders(List.of("Authorization", "Content-Type"));
config.setAllowCredentials(true);
config.setMaxAge(3600L);
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/api/**", config);
return source;
}
// En SecurityFilterChain:
http.cors(cors -> cors.configurationSource(corsConfigurationSource()));
```
## Limitación de Velocidad
- Aplicar Bucket4j o límites a nivel de gateway en endpoints costosos
- Registrar y alertar sobre ráfagas; retornar 429 con hints de reintento
```java
// Usar Bucket4j para limitación de velocidad por endpoint
@Component
public class RateLimitFilter extends OncePerRequestFilter {
private final Map<String, Bucket> buckets = new ConcurrentHashMap<>();
private Bucket createBucket() {
return Bucket.builder()
.addLimit(Bandwidth.classic(100, Refill.intervally(100, Duration.ofMinutes(1))))
.build();
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
FilterChain chain) throws ServletException, IOException {
String clientIp = request.getRemoteAddr();
Bucket bucket = buckets.computeIfAbsent(clientIp, k -> createBucket());
if (bucket.tryConsume(1)) {
chain.doFilter(request, response);
} else {
response.setStatus(HttpStatus.TOO_MANY_REQUESTS.value());
response.getWriter().write("{\"error\": \"Rate limit exceeded\"}");
}
}
}
```
## Seguridad de Dependencias
- Ejecutar OWASP Dependency Check / Snyk en CI
- Mantener Spring Boot y Spring Security en versiones soportadas
- Fallar builds ante CVEs conocidos
## Logging y PII
- Nunca registrar secretos, tokens, contraseñas ni datos PAN completos
- Redactar campos sensibles; usar logging JSON estructurado
## Subida de Archivos
- Validar tamaño, tipo de contenido y extensión
- Almacenar fuera del web root; escanear si es requerido
## Lista de Verificación Antes del Lanzamiento
- [ ] Tokens de autenticación validados y con expiración correcta
- [ ] Guardias de autorización en cada ruta sensible
- [ ] Todas las entradas validadas y sanitizadas
- [ ] Sin SQL concatenado con cadenas
- [ ] Postura CSRF correcta para el tipo de aplicación
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