Kafka Channel fatal error caused by "javax.security.auth.login.LoginException: Could not login"
Article ID: KB0072898
Updated On:
| Products | Versions |
|---|---|
| TIBCO BusinessEvents Enterprise Edition | 6.1 and later |
Description
When a BE application using the Kafka Channel is started, a fatal error occurs:
2021 Oct 28 14:12:43.125 GMT -04:00 kafka.tibco.com FATAL [main] -
[container.standalone] Failed to construct kafka consumer
...
Caused by: org.apache.kafka.common.KafkaException:
javax.security.auth.login.LoginException: Could not login: the client is being
asked for a password, but the Kafka client code does not currently support
obtaining a password from the user. not available to garner
authentication information from the user
Our Kafka broker requires that clients authenticate with Kerberos. What does this error mean and how can it be avoided?
Environment
All Supported Platforms
Resolution
This error indicates that the Kerberos user's keytab file is not being referenced in the client's jaas configuration. In this case, the client is the TIBCO BusinessEvents application that uses the Kafka Channel.
Inspect the client's jaas configuration file, which is typically referenced by your BE application using the Java system property 'java.security.auth.login.config'. For example, in the BE project's CDD file under Cluster > Properties:
In 'kafka_client_jaas.conf', make sure the 'KafkaClient' definition references the client/user's keytab file:
Here, the user's keytab file is expected to exist under C:/keytabs/. If the keytab file exists and you still face this fatal error, consult with your Kerberos administrator to obtain an updated copy of the keytab file.
To assist in troubleshooting, set the 'sun.security.krb5.debug' system property to 'true'. Again, you may do this in your project's CDD file:
For detailed guidance on configuring the Kafka adapters for Kerberos authentication, refer to the Knowledge article entitled "How to enable Kerberos SASL_SSL authentication for the TIBCO BusinessEvents Kafka Channel".
Inspect the client's jaas configuration file, which is typically referenced by your BE application using the Java system property 'java.security.auth.login.config'. For example, in the BE project's CDD file under Cluster > Properties:
java.security.auth.login.config = C:/configs/kafka_client_jaas.conf
In 'kafka_client_jaas.conf', make sure the 'KafkaClient' definition references the client/user's keytab file:
KafkaClient {
com.sun.security.auth.module.Krb5LoginModule required
serviceName="kafka"
useKeyTab=true
debug=true
keyTab="C:/keytabs/user1.user.keytab"
principal="user1/@KAFKA.SECURE";
};
Here, the user's keytab file is expected to exist under C:/keytabs/. If the keytab file exists and you still face this fatal error, consult with your Kerberos administrator to obtain an updated copy of the keytab file.
To assist in troubleshooting, set the 'sun.security.krb5.debug' system property to 'true'. Again, you may do this in your project's CDD file:
sun.security.krb5.debug = true
For detailed guidance on configuring the Kafka adapters for Kerberos authentication, refer to the Knowledge article entitled "How to enable Kerberos SASL_SSL authentication for the TIBCO BusinessEvents Kafka Channel".
Issue/Introduction
Provides some details and background on the fatal error caused by "javax.security.auth.login.LoginException: Could not login".
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