1.问题描述

minio 8.4.4 使用自签名的https的api连接会报错证书错误

1.1 报错日志

PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

1.2 maven 依赖配置

        <!--minio java sdk--><dependency><groupId>io.minio</groupId><artifactId>minio</artifactId><version>8.4.4</version><exclusions><exclusion><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId></exclusion></exclusions></dependency><dependency><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId><version>4.10.0</version></dependency>

1.3 当前spring MinioClient配置

@Configuration
@EnableConfigurationProperties(MinioProperties.class)
public class MinioConfig {@Beanpublic MinioClient minioClient(MinioProperties properties){properties.check();return MinioClient.builder().endpoint(properties.getEndpoint()).credentials(properties.getAccessKey(), properties.getSecretKey()).build();}
}

2.问题分析

通常是因为MinIO默认情况下会验证服务器的TLS证书。在生产环境中，使用自签名证书并不推荐，因为它们不受信任的证书颁发机构（CA）签署，可能会导致安全问题。

3.问题解决

3.1 使用受信任的证书

为了在生产环境中确保安全性，建议获取一个受信任的SSL证书，可以从证书颁发机构（CA）购买，或者使用免费的证书颁发机构（例如Let’s Encrypt）获取SSL证书。

3.2 忽略证书验证

3.2.1 minio客户端

在MinIO客户端（例如mc命令行工具）中，可以使用–insecure选项来忽略证书验证。例如：

mc --insecure <command>

这会告诉MinIO客户端不要验证服务器的TLS证书。请注意，这种做法会降低安全性，不建议在生产环境中使用。

3.2.2 minio sdk 忽略证书验证

在使用Java SDK与自签名证书的服务器进行通信时，一般可以通过自定义SSLContext来忽略证书验证。

MinIO的Java SDK（version 8.0.6及以上）允许自定义OkHttpClient，我们可以使用httpClient方法传递一个自定义的OkHttpClient实例。以便在HTTP、正常HTTPS和自签名HTTPS之间实现兼容性

下面是如何使用自定义的OkHttpClient实现对HTTP、正常HTTPS和自签名HTTPS的兼容性

@Configuration
@EnableConfigurationProperties(MinioProperties.class)
public class MinioConfig {private static final Logger LOGGER = LoggerFactory.getLogger(MinioConfig.class);@Beanpublic MinioClient minioClient(MinioProperties properties){properties.check();// Create a trust manager that does not validate certificate chainsTrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return new X509Certificate[0];}public void checkClientTrusted(X509Certificate[] certs, String authType) {// Do nothing (trust any client certificate)}public void checkServerTrusted(X509Certificate[] certs, String authType) {// Do nothing (trust any server certificate)}}};// Install the all-trusting trust managerSSLContext sslContext = null;try {sslContext = SSLContext.getInstance("SSL");sslContext.init(null, trustAllCerts, new java.security.SecureRandom());} catch (Exception e) {LOGGER.error("Install the all-trusting trust manager error:{}", e.getMessage());}// Create a custom OkHttpClient that trusts all certificatesOkHttpClient customHttpClient = new OkHttpClient.Builder().sslSocketFactory(sslContext.getSocketFactory(), (X509TrustManager) trustAllCerts[0]).hostnameVerifier((hostname, session) -> true).build();// Set the custom SSLContext for MinioClientreturn MinioClient.builder().endpoint(properties.getEndpoint()).credentials(properties.getAccessKey(), properties.getSecretKey()).httpClient(customHttpClient).build();}}

1. 在上面的代码中，我们创建了一个SSLContext，其中的X509TrustManager会信任所有证书，无论其是否由信任的证书颁发机构（CA）签署。
2. 创建了一个自定义的OkHttpClient，该客户端信任所有证书。然后，我们使用MinioClient.builder()方法，将自定义的OkHttpClient传递给httpClient()方法

这种方法会将所有证书都视为受信任的，因此请仅在非生产环境中使用此方法，以确保通信的安全性和完整性。在生产环境中，建议使用受信任的SSL证书。

3.2.2.1 拓展: 补充minioclient请求日志

之前minioclient与服务器端交互使用默认的httpclient的客户端,请求没有打印详细日志. 既然上面自定义自己的httpclient那么可以补充自定义拦截器打印日志

public class CustomLoggingInterceptor implements Interceptor {@Overridepublic Response intercept(Chain chain) throws IOException {Request request = chain.request();long startTime = System.nanoTime();System.out.println("Sending request " + request.url() + " on " + chain.connection() + "\n" + request.headers());Response response = chain.proceed(request);long endTime = System.nanoTime();System.out.println("Received response for " + response.request().url() + " in " + ((endTime - startTime) / 1e6) + "ms\n" + response.headers());MediaType contentType = response.body().contentType();String content = response.body().string();System.out.println("Response body:\n" + content);ResponseBody wrappedBody = ResponseBody.create(contentType, content);return response.newBuilder().body(wrappedBody).build();}
}

修改MinioConfig增加okhttp拦截器

        // Create a custom OkHttpClient that trusts all certificatesOkHttpClient customHttpClient = new OkHttpClient.Builder().sslSocketFactory(sslContext.getSocketFactory(), (X509TrustManager) trustAllCerts[0]).hostnameVerifier((hostname, session) -> true).addInterceptor(new CustomLoggingInterceptor()) // Add custom interceptor here.build();

效果

4. 问题总结

minio客户端本质使用httpclient与服务端交互,因此证书问题处理其实只是httpclient对证书的兼容处理。该处理方式可以运用到其他使用到httpclient的场景。

5.附录

代码优化

@Configuration
@EnableConfigurationProperties(MinioProperties.class)
public class MinioConfig {private static final Logger LOGGER = LoggerFactory.getLogger(MinioConfig.class);@Beanpublic MinioClient minioClient(MinioProperties properties){properties.check();OkHttpClient customHttpClient = null;if (properties.getEndpoint().startsWith("https://")) {// 如果是HTTPS，使用自定义的OkHttpClient处理自签名的HTTPS请求customHttpClient = createCustomOkHttpClient();}MinioClient minioClient;if (customHttpClient != null) {// 如果使用了自定义的OkHttpClientminioClient = MinioClient.builder().endpoint(properties.getEndpoint()).credentials(properties.getAccessKey(), properties.getSecretKey()).httpClient(customHttpClient).build();} else {// 如果是普通HTTP，使用默认的OkHttpClientminioClient = MinioClient.builder().endpoint(properties.getEndpoint()).credentials(properties.getAccessKey(), properties.getSecretKey()).build();}return minioClient;}/*** Set the custom SSLContext for MinioClient* @return*/private static OkHttpClient createCustomOkHttpClient() {// 创建自定义的OkHttpClient，用于处理自签名的HTTPS请求// Create a trust manager that does not validate certificate chainsTrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return new X509Certificate[0];}public void checkClientTrusted(X509Certificate[] certs, String authType) {// Do nothing (trust any client certificate)}public void checkServerTrusted(X509Certificate[] certs, String authType) {// Do nothing (trust any server certificate)}}};// Install the all-trusting trust managerSSLContext sslContext = null;try {sslContext = SSLContext.getInstance("SSL");sslContext.init(null, trustAllCerts, new java.security.SecureRandom());} catch (Exception e) {LOGGER.error("Install the all-trusting trust manager error:{}", e.getMessage());}// Create a custom OkHttpClient that trusts all certificatesOkHttpClient customHttpClient = new OkHttpClient.Builder().sslSocketFactory(sslContext.getSocketFactory(), (X509TrustManager) trustAllCerts[0]).hostnameVerifier((hostname, session) -> true)// 增加minio http请求日志打印//.addInterceptor(new CustomLoggingInterceptor()) // Add custom interceptor here.build();return customHttpClient;}}