Spring Security best practices for authn/authz, validation, CSRF, secrets, headers, rate limiting, and dependency security in Java Spring Boot services.
npxskills add affaan-m/everything-claude-code--skill springboot-securityLoading…
Use when adding auth, handling input, creating endpoints, or dealing with secrets.
httpOnly, Secure, SameSite=Strict cookies for sessionsOncePerRequestFilter or resource server@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);
}
}
@EnableMethodSecurity@PreAuthorize("hasRole('ADMIN')") or @PreAuthorize("@authz.canEdit(#id)")@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();
}
}
@Valid on controllers@NotBlank, @Email, @Size, custom validators// BAD: No validation
@PostMapping("/users")
public User createUser(@RequestBody UserDto dto) {
return userService.create(dto);
}
// GOOD: Validated DTO
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));
}
:param bindings; never concatenate strings// BAD: String concatenation in native query
@Query(value = "SELECT * FROM users WHERE name = '" + name + "'", nativeQuery = true)
// GOOD: Parameterized native query
@Query(value = "SELECT * FROM users WHERE name = :name", nativeQuery = true)
List<User> findByName(@Param("name") String name);
// GOOD: Spring Data derived query (auto-parameterized)
List<User> findByEmailAndActiveTrue(String email);
PasswordEncoder bean, not manual hashing@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder(12); // cost factor 12
}
// In service
public User register(CreateUserDto dto) {
String hashedPassword = passwordEncoder.encode(dto.password());
return userRepository.save(new User(dto.email(), hashedPassword));
}
http
.csrf(csrf -> csrf.disable())
.sessionManagement(sm -> sm.sessionCreationPolicy(SessionCreationPolicy.STATELESS));
application.yml free of credentials; use placeholders# BAD: Hardcoded in application.yml
spring:
datasource:
password: mySecretPassword123
# GOOD: Environment variable placeholder
spring:
datasource:
password: ${DB_PASSWORD}
# GOOD: Spring Cloud Vault integration
spring:
cloud:
vault:
uri: https://vault.example.com
token: ${VAULT_TOKEN}
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)));
* in production@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;
}
// In SecurityFilterChain:
http.cors(cors -> cors.configurationSource(corsConfigurationSource()));
// Using Bucket4j for per-endpoint rate limiting
@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\"}");
}
}
}
Remember: Deny by default, validate inputs, least privilege, and secure-by-configuration first.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).