Kafka SaslAuthenticationException在Ad-hoc基礎上發布SASL_SSL協議

Question

我正在運行一些java 8 Kafka應用程序，其中一些是Kafka流，其他是普通的生產者/消費者。

對於它們中的每一個，都沒有功能問題，它們在大多數情況下運行良好。

但是，對於他們中的每一個，我都會遇到SaslAuthenticationException的特殊情況。 由於它們每兩周左右發生一次，我不確定如何復制/推斷根本原因：

錯誤：

Failed to create channel due to 
org.apache.kafka.common.errors.SaslAuthenticationException: Failed to configure SaslClientAuthenticator
Caused by: org.apache.kafka.common.KafkaException: Principal could not be determined from Subject, this may be a transient failure due to Kerberos re-login

堆棧跟蹤：

Failed to create channel due to 
org.apache.kafka.common.errors.SaslAuthenticationException: Failed to configure SaslClientAuthenticator
Caused by: org.apache.kafka.common.KafkaException: Principal could not be determined from Subject, this may be a transient failure due to Kerberos re-login
    at org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.firstPrincipal(SaslClientAuthenticator.java:441) ~[kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.<init>(SaslClientAuthenticator.java:135) ~[kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.network.SaslChannelBuilder.buildClientAuthenticator(SaslChannelBuilder.java:244) ~[kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.network.SaslChannelBuilder.buildChannel(SaslChannelBuilder.java:194) ~[kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.network.Selector.buildAndAttachKafkaChannel(Selector.java:289) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.network.Selector.registerChannel(Selector.java:280) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.common.network.Selector.connect(Selector.java:215) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:864) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.clients.NetworkClient.access$700(NetworkClient.java:64) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:1035) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:920) [kafka-clients-2.0.1.jar!/:na]
    at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:508) [kafka-clients-2.0.1.jar!/:na]

這就是我向Kafka提供JAAS Kerberos身份驗證的方法（在我的配置文件中，我提供了諸如kdc，realm，keytab，principal之類的信息）：

@Value("${kafka.sasl.kerberos.kdc}")
private String kdc;
@Value("${kafka.sasl.kerberos.realm}")
private String realm;
@Value("${kafka.sasl.kerberos.keytab}")
private Resource keytab;
@Value("${kafka.sasl.kerberos.principal}")
private String principal;

@Bean
public InMemoryConfiguration kafkaOpts() throws IOException {

    System.setProperty("java.security.krb5.kdc", kdc);
    System.setProperty("java.security.krb5.realm", realm);

    Map<String, Object> options = new HashMap<>();
    options.put("keyTab", copyResourceToTempFile(keytab, ".keytab").toString());
    options.put("principal", principal);
    options.put("useKeyTab","true");
    options.put("storeKey","true");
    AppConfigurationEntry kafkaClientConfig = new AppConfigurationEntry(
            "com.sun.security.auth.module.Krb5LoginModule", LoginModuleControlFlag.REQUIRED, options);
    Map<String, AppConfigurationEntry[]> jaasConfigEntries = new HashMap<>();
    jaasConfigEntries.put("KafkaClient", new AppConfigurationEntry[] {kafkaClientConfig});
    InMemoryConfiguration jaasConfig = new InMemoryConfiguration(jaasConfigEntries);
    javax.security.auth.login.Configuration.setConfiguration(jaasConfig);
    return jaasConfig;
}

public static Path copyResourceToTempFile(Resource resource, String extension) {

    try (InputStream in = resource.getInputStream()) {
        Path tempFile = Files.createTempFile("spring-boot-", extension);
        Files.copy(in, tempFile, StandardCopyOption.REPLACE_EXISTING);
        return tempFile;
    } catch (IOException e) {
        log.error("Error creating resource to file",e);
        return null;
    }

}

Answer 1

我們也面臨同樣的問題。 在與kafka連接后，突然我們松開連接和應用程序重試登錄但它失敗了。 但我們使用以下配置更新jaas auth配置文件：

com.sun.security.auth.module.Krb5LoginModule required useTicketCache=true;

這對我來說非常有用。