How to debug Security issues in Spring Boot

Options to debug security issues

You can debug Spring Boot security issues mainly using two options:

Option 1) Provide this property in your application.yml or application.properties file.

logging.level.org.springframework.security=DEBUG

Option 2) Set debug parameter to true in your @EnableWebSecurity annotation

@EnableWebSecurity(debug = true)
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {}

The @EnableWebSecurity is a marker annotation. It allows Spring to find (it’s a @Configuration and, therefore, @Component) and automatically apply the class to the global WebSecurity.

Analyzing the DEBUG Logs

When you are able to reproduce the security issue, it is time to analyze the DEBUG logs. Open the file “spring.log” and search for entries related to Spring Security.

For example, if your security issue involves authentication, you might see log entries like this:

DEBUG o.s.s.authentication.ProviderManager - Authentication attempt using org.springframework.security.authentication.dao.DaoAuthenticationProvider
DEBUG o.s.s.w.a.UsernamePasswordAuthenticationFilter - Authentication success. Updating SecurityContextHolder to contain: org.springframework.security.authentication.UsernamePasswordAuthenticationToken

These log entries tell us that Spring Security is using a DAO-based authentication provider and that the authentication attempt was successful.

Alternatively, if authentication fails, it might look like this:

DEBUG o.s.s.authentication.ProviderManager - Authentication attempt using org.springframework.security.authentication.dao.DaoAuthenticationProvider
DEBUG o.s.s.w.a.UsernamePasswordAuthenticationFilter - Authentication failed: invalid username or password

These log entries tell us that the authentication attempt failed due to an incorrect username or password.

Similarly, if your security issue involves authorization, you might see log entries like this:

DEBUG o.s.s.access.vote.AffirmativeBased - Voter: org.springframework.security.access.prepost.PreInvocationAuthorizationAdviceVoter@XXXXXXXX, returned: -1
DEBUG o.s.s.a.i.a.MethodSecurityInterceptor - Authorization successful

These log entries tell us that the authorization for a specific method was successful.

Troubleshooting and Resolution

With the DEBUG log data, we can identify the exact point of failure and troubleshoot further. In most cases, the issues can be resolved by analyzing the logs carefully and finding the root cause.

For example, if the authentication failed due to an incorrect username or password, we can update the user credentials in the database and retry authentication. If the authorization failed, we can update the authorization settings for the specific method or roles.

In conclusion, setting the logging level of Spring Security to DEBUG can be incredibly useful for debugging security issues in Spring Boot applications. By following the steps outlined in this tutorial, you can quickly identify and resolve any security-related problems in your application.