Spring Boot Security

Spring Boot Security Standards

Priority: P0 (CRITICAL)

Implementation Guidelines

Configuration (Spring Security 6+)

• Lambda DSL: ALWAYS use Lambda DSL.
• SecurityFilterChain: Expose as @Bean. Do not extend WebSecurityConfigurerAdapter.
• Statelessness: Enforce SessionCreationPolicy.STATELESS for REST APIs.

Golden Snippet

See Security Configuration for full SecurityFilterChain example.

Authentication vs Authorization

• Authentication: Validation of credentials (Who are you?). Use AuthenticationManager or JwtDecoder.
• Authorization: Verification of access rights (Can you do this?). Use @PreAuthorize.

JWT Best Practices

• Algorithm: Enforce RS256 or HS256. Reject none algorithm.
• Claims: Validate iss, aud, and exp.
• Tokens: Short-lived access tokens (15m), secure refresh tokens (httpOnly cookie).

Hardening Checklist

• CSRF: Disabled for pure APIs? Enabled + Cookie for Browser Apps?
• CORS: Specific origins permitted? No * with credentials?
• Headers: HSTS, Content-Type-Options, X-Frame-Options enabled?
• Secrets: No hardcoded keys? Loaded from Vault/Env?
• Rate Limiting: Applied on login/expensive endpoints?
• Dependencies: Scanned for CVEs?

Anti-Patterns

• Adapter Extension: **No Adapter**: Use SecurityFilterChain bean.
• Chained Calls: **No .and()**: Use Lambda DSL.
• Hardcoded Secrets: **No Secrets**: Use Vault/Env.
• Legacy Matchers: **No antMatchers**: Use requestMatchers.

References

• Implementation Examples

Related Topics

common/security-standards | architecture