How to Secure Spring Cloud Config Server

Question

I understand that a Spring Cloud Config Server can be protected using an user name and password , which has to be provided by the accessing clients.

How can i prevent the clients from storing these user name and password as clear text in the bootstrap.yml files in the client application/services ?

Answer 1

The very basic "basic authentication" (from here https://github.com/spring-cloud-samples/configserver)

You can add HTTP Basic authentication by including an extra dependency on Spring Security (e.g. via spring-boot-starter-security). The user name is "user" and the password is printed on the console on startup (standard Spring Boot approach). If using maven (pom.xml):

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

If you want custom user/password pairs, you need indicate in server configuration file

security:
    basic:
        enabled: false

and add this minimal Class in your code (BasicSecurityConfiguration.java):

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
//@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
public class BasicSecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Value("#{'${qa.admin.password:admin}'}") //property with default value
        String admin_password;

    @Value("#{'${qa.user.password:user}'}") //property with default value
            String user_password;

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
            .withUser("user").password(user_password).roles("USER")
        .and()
            .withUser("admin").password(admin_password).roles("USER", "ACTUATOR");
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .csrf()
            .disable()
            .httpBasic()
         .and()
            .authorizeRequests()
            .antMatchers("/encrypt/**").authenticated()
            .antMatchers("/decrypt/**").authenticated()
            //.antMatchers("/admin/**").hasAuthority("ROLE_ACTUATOR")
            //.antMatchers("/qa/**").permitAll()

        ;
    }

}

@Value("#{'${qa.admin.password:admin}'}") allow passwords to be defined in property configuration file, environment variables or command line.

For example (application.yml):

server:
  port: 8888

security:
    basic:
        enabled: false

qa:
  admin:
    password: adminadmin
  user:
    password: useruser

management:
  port: 8888
  context-path: /admin

logging:
  level:
    org.springframework.cloud: 'DEBUG'

spring:
  cloud:
    config:
      server:
        git:
          ignoreLocalSshSettings: true
          uri: ssh://[email protected]/repo/configuration.git

This works for me.

Edit: Instead of the Class, you can put basic user configuration directly in application.yaml:

security:
  basic:
    enabled: true
    path: /**
  ignored: /health**,/info**,/metrics**,/trace**
  user:
    name: admin
    password: tupassword

For Spring Boot 2 the configuration in application.yml are now under spring.security.* (https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-application-properties.html#security-properties)

spring.security:
  basic:
    enabled: true
    path: /**
  ignored: /health**,/info**,/metrics**,/trace**
  user:
    name: admin
    password: tupassword