How To By-pass SSL Certificate Validation in spring-boot-admin? - spring-boot

Question

So I'm able to disable the SBA Admin server from validating SSL certs from the clients it tries to connect to - for SBA version 2.6.2 it is more or less outlined right from their documentation: https://codecentric.github.io/spring-boot-admin/current/#_using_mutual_tls
Here is the complete configuration overriding bean:
package com.markham.mkmappadmin.config;
import javax.net.ssl.SSLException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.reactive.ClientHttpConnector;
import org.springframework.http.client.reactive.ReactorClientHttpConnector;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import reactor.netty.http.client.HttpClient;
/**
* Custom http client class which overrides Spring Boot Admin's server default client.<br>
* The custom client will bypass any SSL Validation by configuring an instance of
* {#link InsecureTrustManagerFactory}
* #author Hanif Rajabali
* #see Spring Boot Admin 2.6.2 Using Mutual TLS
*/
#Configuration
public class CustomHttpClientConfig {
#Bean
public ClientHttpConnector customHttpClient() throws SSLException {
SslContext sslContext = SslContextBuilder
.forClient()
.trustManager(InsecureTrustManagerFactory.INSTANCE)
.build();
HttpClient httpClient = HttpClient.create().secure(
ssl -> ssl.sslContext(sslContext)
);
return new ReactorClientHttpConnector(httpClient);
}
}
What I still haven't figured out is how to disable it from the SBA client. I have a custom RestTemplate Config defined below, but the SBA client doesn't seem to be picking it up even though I see that the SBA client code is using the BlockingRegistrationClient i.e) RestTemplate
package com.markham.mkmemailerws.config;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
/**
* Need to explicitly build Spring Boot's auto configured
* {#link #restTemplate(RestTemplateBuilder)}
*
* #author Hanif Rajabali
*
*/
#Configuration
public class RestTemplateConfig {
// #Bean
// public RestTemplate restTemplate(RestTemplateBuilder restTemplateBuilder) {
// return restTemplateBuilder.build();
// }
/**
* The following will bypass ssl validation altogether. Not ideal.
*/
#Bean
public RestTemplate restTemplate(RestTemplateBuilder builder)
throws NoSuchAlgorithmException, KeyManagementException {
TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return new X509Certificate[0];
}
public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
}
public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
}
} };
SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
CloseableHttpClient httpClient = HttpClients.custom().setSSLContext(sslContext)
.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).build();
HttpComponentsClientHttpRequestFactory customRequestFactory = new HttpComponentsClientHttpRequestFactory();
customRequestFactory.setHttpClient(httpClient);
return builder.requestFactory(() -> customRequestFactory).build();
}
}