How to Fix Spring Security Role Authentication Issues When Non-Admin Users Access Privileged Resources?

Fixing Role Authentication in Spring Security

When utilizing Spring Security, role-based access control is crucial for safeguarding resources. In a recent project, you've encountered an issue where non-admin users could access privileged resources. We'll examine the problem's root cause and provide a solution to rectify it.

Your configured AuthenticationManagerBuilder leverages a JDBC-based authentication mechanism, utilizing a dataSource for user authentication and authorities retrieval. The issue stems from the user authentication query:

"select username, password, 1 from users where username=?"

In this query, the "1" is inconsequential, while the primary key for user identification is neglected. As a result, all users are mistakenly assigned the same role, enabling non-admin users to bypass access restrictions.

To rectify this problem, the authentication query should explicitly fetch the role information associated with the user:

select username, password, role 
from users where username=?

Additionally, to prioritize role-based access control, your HTTP security configuration should be modified as follows:

@Override
protected void configure(HttpSecurity http) throws Exception {
    http
        .csrf().disable()      
        .httpBasic()
            .and()
        .authorizeRequests()
            .antMatchers("/users/all").hasRole("admin")
            .anyRequest().authenticated()
            .and()
        .formLogin()
            .and()
        .exceptionHandling().accessDeniedPage("/403");
}

In this configuration, the anyRequest() matcher checks for authentication first, followed by the role-specific matcher for "/users/all." This ensures that non-admin users are denied access to privileged resources, resolving your initial issue.

By implementing these modifications, Spring Security's role-based access control will function correctly, preventing unauthorized access to protected resources.

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