Spring Boot in-memory security with users from application.properties

Question

I have a basic Spring Boot application which uses inMemoryAuthentication and a list of authorized users declared in the code:

  @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().withUser("guest").password("{noop}guest1234").roles("USER");
        auth.inMemoryAuthentication().withUser("admin").password("{noop}password").roles("ADMIN");
    }

I'd like to move the user/roles list into the application.properties file, for example for the admin user:

spring.security.user.name=admin
spring.security.user.password=password
spring.security.user.roles=ADMIN

However that does not seem to work as I'm getting a 403 error. What am I missing? Thanks

Answer 1

spring security has only one default user, you can provide others by using your custom properties

...
    @Autowired
    private ApplicationProperties properties;
...
@Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> builder = auth.inMemoryAuthentication();
        properties.getUsers().forEach(user -> {
            builder.withUser(user.getUsername()).password(user.getPassword()).roles((String[]) user.getRoles().toArray());
        });
    }

with your ApplicationProperties

@ConfigurationProperties(prefix = "application", ignoreUnknownFields = false)
public class ApplicationProperties {
    private final List<Users> users = new ArrayList<>();

    public static class Users {
        private String username;
        private String password;
        private List<String> roles;
        public String getUsername() {
            return username;
        }

        public void setRoles(List<String> roles) {
            this.roles = roles;
        }

        public String getPassword() {
            return password;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public void setPassword(String password) {
            this.password = password;
        }

        public List<String> getRoles() {
            return roles;
        }
    }

    public List<Users> getUsers() {
        return users;
    }
}

and your.yaml file (yaml is less verbose than.properties files)

spring:
  application:
    name: MyApp
...
application:
  users:
    -
      username: guest
      password: guest1234
      roles: USER
    -
      username: admin
      password: password
      roles: USER,ADMIN

I hope this can help you