I was having this issue as well as many other while trying to configure kafka with SSL or SASL_SSL. I'm posting a full tutorial here in case anyone else runs into the same issues. I am using kafka-python 1.4.6 with kafka 2.2.0 on CentOS 6.
Below are the configurations that worked for me for SASL_SSL using kafka-python client. These configurations can be used for PLAINTEXT and SSL security protocols along with SASL_SSL and SASL_PLAINTEXT.
Bash script to generate key files, CARoot, and self-signed cert for use with SSL:
#!/bin/bash
#Step 1
keytool -keystore server.keystore.jks -alias localhost -validity 365 -keyalg RSA -genkey
#Step 2
openssl req -new -x509 -keyout ca-key -out ca-cert -days 365
keytool -keystore server.truststore.jks -alias CARoot -import -file ca-cert
keytool -keystore client.truststore.jks -alias CARoot -import -file ca-cert
#Step 3
keytool -keystore server.keystore.jks -alias localhost -certreq -file cert-file
openssl x509 -req -CA ca-cert -CAkey ca-key -in cert-file -out cert-signed -days 365 -CAcreateserial -passin pass:admin123
keytool -keystore server.keystore.jks -alias CARoot -import -file ca-cert
keytool -keystore server.keystore.jks -alias localhost -import -file cert-signed
You can then use the following command to extract the CARoot.pem:
keytool -exportcert -alias CARoot -keystore server.keystore.jks -rfc -file CARoot.pem
In my server.properties file I have:
listeners=PLAINTEXT://localhost:9091,SASL_PLAINTEXT://localhost:9092,SSL://localhost:9093,SASL_SSL://localhost:9094
security.protocol=SSL
sasl.enabled.mechanisms=PLAIN
ssl.truststore.location=/var/private/ssl/server.truststore.jks
ssl.truststore.password=admin123
ssl.keystore.location=/var/private/ssl/server.keystore.jks
ssl.keystore.password=admin123
ssl.enabled.protocols=TLSv1.2,TLSv1.1,TLSv1
advertised.listeners=PLAINTEXT://localhost:9091,SASL_PLAINTEXT://localhost:9092,SSL://localhost:9093,SASL_SSL://localhost:9094
In my JAAS configuration file(/etc/kafka/kafka_plain_jaas.conf):
KafkaServer {
org.apache.kafka.common.security.plain.PlainLoginModule required
username=kafka
password=kafka-secret
user_username=password;
};
KafkaClient {
org.apache.kafka.common.security.plain.PlainLoginModule required
username=username
password=password;
};
Before starting the Kafka server, need to run the following:
export KAFKA_OPTS="-Djava.security.auth.login.config=/etc/kafka/kafka_plain_jaas.conf"
Python consumer and producer:
The ssl_context and api_version are what caused SSL handshake errors to occur for me, leading to a timeout. So I commented those out. (There were some tutorials out there that mentioned to use those.)
from kafka import KafkaConsumer, KafkaProducer
import kafka
import ssl
import logging
logging.basicConfig(level=logging.DEBUG)
try:
topic = "sendMessage"
sasl_mechanism = "PLAIN"
username = "username"
password = "password"
security_protocol = "SASL_SSL"
#context = ssl.create_default_context()
#context.options &= ssl.OP_NO_TLSv1
#context.options &= ssl.OP_NO_TLSv1_1
consumer = KafkaConsumer(topic, bootstrap_servers='localhost:9094',
#api_version=(0, 10),
security_protocol=security_protocol,
#ssl_context=context,
ssl_check_hostname=True,
ssl_cafile='../keys/CARoot.pem',
sasl_mechanism = sasl_mechanism,
sasl_plain_username = username,
sasl_plain_password = password)
#ssl_certfile='../keys/certificate.pem',
#ssl_keyfile='../keys/key.pem')#,api_version = (0, 10))
producer = KafkaProducer(bootstrap_servers='localhost:9094',
#api_version=(0, 10),
security_protocol=security_protocol,
#ssl_context=context,
ssl_check_hostname=True,
ssl_cafile='../keys/CARoot.pem',
sasl_mechanism=sasl_mechanism,
sasl_plain_username=username,
sasl_plain_password=password)
#ssl_certfile='../keys/certificate.pem',
#ssl_keyfile='../keys/key.pem')#, api_version = (0,10))
# Write hello world to test topic
producer.send(topic, bytes("Hello World SSL"))
producer.flush()
for msg in consumer:
print(msg)
except Exception as e:
print e
