Kafka hostname verification. Without a full log, it is not clear what the SSL issue is.

Kafka hostname verification 0 and higher. ). then trying to verify hostname: 10-244-180-244. If you are using the Kafka Streams API, you can read on how to configure equivalent SSL and SASL parameters. keystore. 174 and has SSL certificate for hostname my-amqp-broker you can add following record to the hosts file to map the IP address against the hostname: For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. JSSE docs says: We are working on getting Amazon MSK (Kafka) working with IAM authentication &amp; thereafter making it publicly accessible by DNS using changes in the aws kafka advertised listeners. hostnameVerifier properties in the product's startup script ( api-manager. xxx/something (where xxx. lookup configuration to make the NIO client trying all the possible IP's of a hostname before failing the connection to that hostname. To disable server hostname verification (not recommended for production), add a Kafka property by performing the following steps: Create a If you are using TLS/SSL encryption, you need to select a method to resolve SSL hostname verification failure. Authored by dcausse on Sep 28 2021, 8:27 AM. Kafka, while powerful, isn’t designed for direct internet access—particularly when it comes to the last mile, the critical network segment that extends beyond enterprise boundaries and edges (LAN or WAN) to reach end users. The AKS load balancer doesn't have an assigned hostname but an IP address which is used on the client side for connecting to the Kafka cluster. Since we are explicitly deviating from the ZooKeeper system properties everywhere else, and since this config is rarely used, we will stay consistent with the Kafka config here as well. algorithm” to https. server algorithm=https # Optional but ensures hostname verification ssl. I have a registered hostname and a DNS rule in Azure that points to the loadbalancer service. Internal and External Connectivity # When securing network connections between machines processes through authentication and encryption, Confluent kafka python with SSL and hostname verification. schema. 29. It takes messages from event producers and then distributes them among message aws-msk-iam-sasl-signer-python version: 1. When your client uses https://xxx. 1 and uses SSL. Otherwise, the component fails to connect to the Kafka server. Kafka-python can be used for building real-time data pipelines and streaming applications. The listeners should always be ://0. This is done using the org. protocol=SSL ssl. Use the ssl. The advertised. identificat For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. Looking for articles and discussions? We've moved to the Qlik Community! please let me know how to disable SSL hostname verification in kafka jdbc connect ssl. I configured three servers in my zoo. you can bypass hostname verification with this: Java Kafka consumer Received fatal alert: bad_certificate when migrating from Python to Java Dudes, watch carefully and follow the instructions Step 1: Run all scripts (if necessary, set the values) keytool -keystore kafka. Kafka SSL hostname verification #221. 0 onwards, host name verification of servers is enabled by default and the errors were logged because, #the kafka hostname didnt match the certificate CN. 2 required. I'd like to know how to get information about who is connecting to the cluster either to produce or consume messages. Import CA certificate In TrustStore: keytool -keystore kafka. Using kafka. security. F34660169: Confluent kafka python with SSL and hostname verification: Sep 28 2021, 8:49 AM 2021-09-28 08:49:43 (UTC+0) F34660093: Confluent kafka python to solve this I tried a number of python installations (provided by brew, pyenv and eventually the installer from the python website). algorithm is now set to https. NOTE: TLS/SSL authentication is not enabled by default. The trick is to get that host name to always resolve to the correct IP. Here is my docker compose file. The Kafka hostname verification feature cannot be used if OBA self Allow kafka clients to verify brokers hostnames when using SSL. As mentioned in the 2. If your broker is running on IP address 192. algorithm to empty string Configuring hostname verification¶. 0 introduced a change of behaviour related to the handling of SSL connections. Connection made using SQL Server authentication. 0 upgrade notes, the broker setting ssl. For a successful attack to be performed, the attacker needs to perform a Man-in-the-Middle attack or compromise any external systems, such as DNS or I have a test Kafka Cluster in AWS MSK with three brokers. Commented Mar 31, 2014 at 12:09. algorithm property to enable or disable hostname verification I have 2 certificate files, truststore. algorithm= "ssl. It expands Kafka enabling support for Apache Avro, JSON, and Protobuf schemas. For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. I don't want to disable entirely the certificate validation, only the hostname checking. Is there any way to ignore the hostname match but keep all the rest of the verification? What is Apache Kafka? Apache Kafka is a centralized message stream which is fast, scalable, durable and distributed by design. x. I have tried multiple options like adding the ssl. Online Help Keyboard Shortcuts Feed Builder What’s new If you are using TLS/SSL encryption, you need to select a method to resolve SSL hostname verification failure. 11 Operating System: MacOS Method of installation: pip3 Kafka library name: confluent-kafka-python Kafka library version: 2. This is the default since Kafka 2. javaapi. apache. Hot Network Questions Draytek firewall rule isolate IP 1. None. I have setup zookeeper as a StatefulSet in order to reliably persist config data. HiddevH asked this question in Q&A. location property to https？ Hit enter to search. name to a host name, not an IP address. Disabling hostname verification can increase vulnerability to man-in-the-middle attacks. 168. Each of which has its own set of self-signed certificates. compute-1. Clients including client con I have a confluent Kafka consumer code using Python. algorithm= python-client: ssl_check_hostname=True. com 389 Install the ldapsearch tool to conduct subsequent tests: From kafka 2. This fails the client broker kerberos validation and results in SASL authentication failure. kafka_source. Here is the code, with all the relevant imports: Kafka SSL hostname verification #221. xxx is an IP address), the certificate identity is checked against this IP address (in theory, only using an IP SAN extension). protocol=SASL_SSL ssl. disableHostnameVerification and httpclient. I have enabled tls authentication and I have exposed the service with NodePort. It would be useful to have a way to override the hostname used for TLS hostname verification. ZooKeeper does TLS hostname verification through a reverse DNS lookup. sh--help Validate This does not make much sense => the hostname verification should work for all internal listeners. true. listeners. The Kafka hostname verification feature cannot be used if OBA self Note that ssl. And how do i skip the hostname verify after i set jwt. In the following configuration example, the underlying assumption is that client authentication is required by the broker so that you can store it in a client properties file client Without more details it's hard to tell for sure, but 2. which ultimately activates the host to CN verification. Help. Stack Overflow. Active Public. properties. consumer. httpclient. This enforces hostname verification to prevent "man-in-the-middle" attacks. converter. jks -alias kafka-1 -keyalg RSA -validity 365 -genkey openssl req -new -x509 -keyout ca-key -out ca-cert -days 365 keytool -keystore kafka. html#security_confighostname its sometimes necessary to disable https hostname verification to connect to a cluster SYMPTOM When connecting to Kafka using SSL, it fails with the hostname verification error like the following: Caused by: java. 0 to 2. algorithm The endpoint identification algorithm used by clients to validate server host name. To make A certificate was corrupt, contained signatures that did not verify correctly, etc. Specifies whether hostname verification is enabled. CertificateExc If you are using TLS/SSL encryption, you need to select a method to resolve SSL hostname verification failure. So, if you are using Kubernetes, this is clearly a deal The AvroConverter needs more configurations to be able to use https. command that reinstalls the certificates. hal. org. Note that when using Avro in a secure environment, you need to add *. Is it possible to disable SSL certification verification? #4459. listeners" property to "SSL://<ip>:9093"; Set up librdkafka with SSL and hostname verification; Set the librdkafka property "bootstrap. Actions. 6. Pros and cons. About; Products Hostname verification failed The author stated that connection to MSK via NLB using IAM auth was not supported in 2021. Currently Kafka versions from 0. If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the broker certificates with the actual hostnames that are used in Kerberos principal name that Kafka runs as, not including /hostname@REALM. The problem is that java test programs cannot send messages to the kafka server from the host machine. public string SaslKerberosServiceName { get; set; } Server (broker) hostname verification as specified in RFC2818. This in an insecure default value since hostname verification is required to prevent man-in-the-middle attacks. Declaration. 0 Python version: 3. When implementing this change, I suggest using an explicit value of none instead of using a blank (or zero-length string in the case of JSON). kafka-replica-verification utility is used to verify replica consistency (i. To make this Set up a kafka broker with SSL and a client certificate, containing the IP Address SAN; Set the kafka broker "advertised. The Kafka protocol version that Elastic Agent will request when connecting. For small environments I usually setup all of the hosts with all of their internal The docker compose also exposes the kafka 9092 port to the host machine. zookeeper. Unanswered. algorithm to an empty string SYMPTOM When connecting to Kafka using SSL, it fails with the hostname verification error like the following: Caused by: java. 0 onwards, hostname verification of servers is enabled by default for client connections as well as inter-broker connections. -keystore kafka. The default value for ssl. verification=false I have an SSL enabled Kafka cluster installed by HDP. Even though Kafka supports server hostname verification To enable hostname verification you must use or create your own root certification authority (CA) and configure Kafka ingestion to use that CA with the following steps: Obtain a root certificate For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. version: '2' services: kafka-ui: container_name I think you're misunderstanding the concept of "bootstrapping". According When a cKafka component is configured with SSL, the Kafka server hostname needs to match the hostname in the certificate in the truststore. jks and keystore. The Kafka hostname verification feature cannot be used if OBA self Essentially two things you need to do are use a custom TrustStrategy that trusts all certs, and also use NoopHostnameVerifier() to disable hostname verification. With Bitnami images the latest bug fixes and features are available as soon as possible. connect should point to zookeeper port and not the kafka broker port. amazonaws. How to get server IP address in custom HostnameVerifier. 0, in my opinion, then you use OS level firewall settings to restrict access. 0 and newer, the version must be set to at least 2. So, it should be zookeeper. lab-zookeeper-client. 0 are supported, however the latest Kafka version (3. The Kafka hostname verification feature cannot be used if OBA self Even though Kafka supports server hostname verification and the documentation talks about setting hostnames in server certificates, hostname verification is disabled by default. My team and I finally figured out a solution after piecing together information from different sources. The default is to return a FQDN using getCanonicalHostName(), but this is only best effort and falls back to an IP. Without a full log, it is not clear what the SSL issue is. I couldn't find something similar in requests. The Kafka hostname verification feature cannot be used if OBA self Name and Version bitnami/kafka:3. As I am using nodeport TLS authentication in strimzi kafka, hostname verification needs to be disabled for the client, in this case it's IIB. NLB has 3 listeners for IAM brokers: TLS:7200 -> Skip to main content. clients. This would allow clients to specify a trusted name for scenarios that would otherwise require modifications to the certificates (DNS SANs, IP SANs, etc. protocol property sets the default TLS version for all connections, and it must be chosen from the enabled protocols. ZKTrustManager) [ListenerHandler-my-clu For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. The product startup script is stored in the Kafka should use the IP address directly for SSL engine creation and authentication when IPs are provided for communication, without performing a reverse DNS lookup. To disable server hostname verification (not recommended for production), add a Kafka property by performing the following The kafka server principal doesn't match the hostname referenced by the client (as the SaslAuthenticator will compare the alias' FQDN with the kafka broker hostname). algorithm was changed to https, which performs hostname verification (man-in-the-middle attacks are possible otherwise). So essentially: It is told to connect to something like tao-zookeeper-0. After that I have exported my ca and my password to generate a JKS to As described in the docs, when using node ports listeners, you have to by default disable the hostname verification in your client. vers I configured an AWS MSK cluster with public access. jks. Request: issue links FLUME-3391 (duplicated) FLUME-3315 steps to reproduce using kafka as source set transmit protocol like a1. kafka-topics-Kafka topics if server cert do not have common name, ssl handshake fails. This was working fine in previous versions of ruby-kafka # Ping the LDAP host to verify connectivity ping ldap. From Looking for Qlik Talend Support? Click here to log into our Support Portal. It should also work for all external listeners apart from node ports. See the java docs for getCanonicalHostName(). svc. staging-zookeeper-nodes. protocol=SASL_SSL to use ssl secu Certificate hostname verification in java - subject alternative names. For reference, the Go TLS stack provides a ServerName field for this purpose: tls - The Go Programming Language. Defaults to 1. As a client when testing the TLS call, we’re trying to perform hostname verification of the Kafka broker by setting the configuration “ssl. 1o, I’m having an issue getting openssl to verify the hostname for a DNS wildcard SAN in the certificate for our mutliple kafka brokers (kafka-0, kafka-1, or kafka-2). OpenSSL >= 1. /bin/kafka-replica-verification. connect=<Machine A's static IP>:2181. Yes, the default is the hostname, and this means only CVE-2024-8285: Addressing Missing Upstream Kafka TLS Hostname Verification. Overall, there doesn't seem to be many benefits in using the very same certificate for the CA and the server certificate. HiddevH Mar 11, 2021 · 0 Otherwise, the component fails to connect to the Kafka server. implementation=SHA1PRNG I am running a Kafka instance on Kubernetes (AKS) using the Bitnami helm chart, it is exposed through a loadbalancer service. Make sure that the common names (CN) in your certificates match your hostname. sources. dns. While testing the Kafka cluster external access using loadbalancer on AKS, it turned out that the hostname verification doesn't work with IP addresses (as for the current status). algorithm to empty string Kafka Improvement Proposals; KIP-294 - Enable TLS hostname verification by default; Browse pages Kafka Improvement Proposals; KIP-294 - Enable TLS hostname verification by default Kafka client broker and and inter broker communication can be secured using either SASL or mTLS ( SSL) . keytool -keystore kafka. This opens a back door for man-in-the-middle (MITM) attacks because attackers only need to present a valid SSL/TLS certificate for a different hostname to successfully intercept the When exposing Kafka using node ports with TLS, Strimzi currently doesn’t support TLS hostname verification. algorithm to an empty string If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the · Introduction: · Starting Kafka with SSL setup ∘ Step 1: Prerequisites ∘ Step 2: Generate SSL Certificates ∘ Step 3: Configure Kafka for SSL ∘ Step 4: Start Kafka server TLS can be used a security protocol with Kafka to enable server authentication, client authentication and encryption. . security. [RFC 2246]. The Kafka hostname verification feature cannot be used if OBA self [kafka] verify_hostname = true ca_cert_file = new-ca-cert; Push the bundle to the search head cluster. The Kafka hostname verification feature cannot be used if OBA self SSL Setup # This page provides instructions on how to enable TLS/SSL authentication and encryption for network communication with and between Flink processes. 0 However, Kafka uses a different convention: it clears the endpoint identification algorithm from its default value of https to disable hostname verification. Share. 0 Provide us a sample code snippet of your prod Kafka version. Routes are only available on Red Hat OpenShift. publickey. certificate. I verified hostnames are indeed resolvable using nslookup inside my cluster. truststore. The hostname verification is disabled by default. com), but the certs CN is a random alpha string. If you use external listener, you should connect from the On a Centos 7 machine, upgrading from Python 3. Closed, Resolved Public. In order to verify that the hostname provided by the server is included in the hostnames included in the certificate's CN or SAN you need to read the hostname from the connection and the SAN & CN from the cert as follows: Is it possible to disable SSL certificate verification in Apache Kafka Java client? 762. Edit Paste; Flag For Later; Tags. 9. So this should be also tested and not be disabled int he tests. They only support the latest protocol. endpoint. The product startup script is stored in the Description. enabled. kafka: ssl. algorithm to an empty string to restore the previous behaviour. I know I could get around this issue by updating our kafkaAdminClient configs to The hosts file is used to map hostnames to IP addresses. , validate that all replicas for a set of topics have the same data). cert. All trusting HostnameVerifier causes SSL errors with HttpURLConnection. Referenced Files. secure. producer. pem. host. Specifies the ZooKeeper connection string in the form hostname:port where host and port are the host and port of a ZooKeeper server. If your hostname and certificate doesnt match, then you can disable the hostname verification by setting the property ssl. Heroku Kafka uses SSL for authentication and issues and client certificate and key, and provides a CA certificate. We are testing the new TLS configuration in our Kafka Clusters in Test Environment, and we have two types of consumers on using librdkafka and other using Kafka Consumers in Scala. The identified flaw in Kroxylicious relates to the improper verification of the server's hostname when establishing a TLS secured connection with the upstream Kafka server. I have tried disabling hostname verification for the Kafka-Connect and Kafka itself, I have a bunch of internal Kafka clusters with SASL_SSL authentication required that I'm trying to get kafka-ui to connect to. Clients including client con THIS IS A TEST INSTANCE. 161; It connects to this address and gets the certificate 2. Skinkpajen Asks: Making AWS MSK public using NLB and IAM authentication - Hostname verification failed We are working on getting Amazon MSK (Kafka) working with IAM authentication & thereafter making it publicly accessible by DNS using changes in the aws kafka advertised listeners. 0-debian-11-r3 What architecture are you using? amd64 What steps will reproduce the bug? Deployed Kafka w/ Kraft support to an Ubuntu docker image hosted on a Kub While the default SSLSocket doesn't do any hostname verification by default (you can configure it), it's useful to have a valid host name for a server certificate, since clients should really verify it in principle. If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the broker certificates with the actual hostnames that are used in If you are using TLS/SSL encryption, you need to select a method to resolve SSL hostname verification failure. The file can be used to assign specific hostname to given IP address. Kafka servers use this truststore to verify client certificates. If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the broker certificates with the actual hostnames that are used in I'm using the Heroku kafka addon. cluster. 10. For those who struggling make Fluentd work with kafka cluster over SSL using self signed rootCA as I did: Regardless of what "ssl_verify_hostname" is set to, I was getting below errors: 2019-12-10 23:23:06 +0000 [warn]: #0 failed to flus For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. Online Help Keyboard Shortcuts Feed Builder What’s new When establishing the connection with the upstream Kafka server using a TLS secured connection, Kroxylicious fails to properly verify the server’s hostname, resulting in an insecure connection. by adding this line, you assign an empty string for ssl. If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the broker certificates with the actual hostnames that are used in Bitnami closely tracks upstream source changes and promptly publishes new versions of this image using our automated systems. name of the kafka server is set to kafka and all the other containers can talk to it fine using this name. tls. Clients including client con I follow this guide to create kafka cluster with ssl link I create certs and truststore using this script I create kafka-ui docker compose as follow. 1. default: kafka importance: low. jks and chain_certificate. For a successful attack to be performed, the attacker needs to perform a Man-in-the-Middle attack or compromise any external For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. jks -alias CARoot -importcert -file ca-cert keytool -keystore kafka. registry. 4 and upgrading openssl 1. tao-zookeeper-nodes. [kafka@staging-zookeeper-0 kafka]$ hostname -f staging-zookeeper-0. 0. If TLS encryption is used and a client connects to the load balancer host, the SSL hostname verification fails on the Kafka client side, because the client compares the hostnames in the broker certificates with the actual hostnames that are used in Set advertised. When establishing the connection with the upstream Kafka server using a TLS secured connection, Kroxylicious fails to properly verify the server's hostname, resulting in an insecure connection. ALL YOUR CHANGES WILL BE LOST!!!! Log in Skip to sidebar Skip to main content. Online Help Keyboard Shortcuts Feed Builder What’s new "ssl. algorithm to an empty string. kafka-replica-verification uses ReplicaVerificationTool with ReplicaFetchers for its execution. client. cfg by hostname, but on startup, hostname resolution fails. The address the clients actually use is defined by the advertised. Actions Hostname verification is used to ensure that the certificate presented by the server matches the hostname of the server. Clients including client con Alternatively, you can choose to disable server host verification: Disable server host name verification by setting ssl. 2-fips to openssl 1. As par: https://kafka. algorithm= The text was updated successfully, but these errors were encountered: There is NLB. hostname property can be used to set the host name. For testing purposes (or in the case of a self-signed certificate), how can you connect successfully without changing the hostname in the certificate? Answer. SSL protocol verify CN against hostname. keystore. amazon-web-services; apache-kafka; amazon-iam; This is essentially an issue with how your DNS is configured. I created an AWS Secret via Secrets Manager and assigned it to the cluster. In case you want to ignore hostname verification on Kafka certificates, The ingress. hostname. com # Connect to the LDAP host (this command uses the default port) telnet ldap. Not sure if this is feasible or not, but I generally find working with "blanks" more difficult to troubleshoot. You can disable this hostname verification by setting ssl. check. jks contains a full certificate chain for the kafka endpoint I'm using as well as a private key for my application. 1. ec2-xxx-xxx-xxx-xxx. Clients including client con @sberyozkin i set quarkus. For a successful attack to be performed, the attacker needs to perform a Man-in-the-Middle attack or compromise any external systems, such as DNS or For hostname verification to work, the Apache Kafka Cluster requires IP Address and DNS Hostname to be present in the certificate’s Subject Alternative Name (SAN) fields. "ssl. hostname = False/True, but every time I am getting different errors and I'm not able to connect to the broker and topic. protocols property specifies the available TLS versions that can be used for secure communication between the cluster and its clients. 0 onwards, host name verification of servers is enabled by default and the errors were logged because, the kafka hostname didnt match the certificate CN. 0 is selected. The default value is HTTPS. Looking for articles and discussions? We've moved to the Qlik Community! Vert. Filebeat can do this too, but it's not realy clear: output. Do you know how can I disable Kafka hostname verification for using Kafka scripts such as kafka-console-consumer. I tried to fix the issue by running Install Certificates. Using "rejectUnauthorized": false works but then it does not verify the cert is signed by the provided CA. If your hostname and certificate doesnt match, #then you can disable the hostname verification by setting the property ssl. By doing this we can avoid handshake failure errors due to hostname verification Confluent Schema Registry provides a RESTful interface by adding a serving layer for your metadata on top of Kafka. jks -alias CARoot -importcert -file ca-cert keytool hostname-verification. The hosts are just ec2 hosts (eg. Broker configurations reference When establishing the connection with the upstream Kafka server using a TLS secured connection, Kroxylicious fails to properly verify the server's hostname, resulting in an insecure connection. add a way to disable the server host name verification . Logs. withProperty(SslConfigs. 8. The main reason for that is that with node ports it is hard to pin down the addresses which will be used and add it I am running Zookeeper in an OpenShift/Kubernetes environment. 7. 8 to python 3. It explicitly rejects making "use_all_dns_ips" as the default to avoid impacting existing users, but it did not explain what the impact is. Spaces "ssl. svc; It resolves it to the IP address 192. 14 (org. Set ssl. Kafka clients will connect to the bootstrap route, which will route them through the bootstrap service to one of the brokers. x (and Netty) disable hostname validation of SSL/TLS certificates by default. For instance, MSSQL Server logs successful connections: Login succeeded for user 'sa'. xxx. verify. verification_mode: certificate certificate Verifies that the provided certificate is signed by a trusted authority (CA), but does not perform any hostname verification. random. properties the following configuration and finally restart your Kafka Cluster: ssl. @ncliang I've run into the same issue recently and am glad that it's being addressed. But when connecting to the internal service such as kafka-kafka-external-bootstrap:9093, you will likely fail hostname verification. – user3480498. The ssl. Improve this answer. sh? This is my config right now: security. none - No endpoint verification. local [kafka@staging-zookeeper-0 kafka]$ nslookup staging-zookeeper-0 By default, Kafka clients verify that the hostname in the broker URL and the hostname in the broker certificate match. algorithm=none enable. Public Interfaces. algorithm. Producer errors. Clients including client con "ssl. i'm trying to deploy kafka using strimzi, but zookeeper keep throwing following exception Failed to verify hostname: 10. be added to the TLS certificates and your Kafka clients can use TLS hostname verification. identification. algorithm is used because single-server certificate is used for each server in a cluster, therefore I have to bypass SSL hostname verification this way. trust-all=true, and it still need hostname verify then show the exception：No subject alternative DNS name matching userservice found. Hit enter to search. opensaml. jks -alias CARoot -importcert -file ca-cert keytool -keystore #From kafka 2. jks -alias CARoot -import -file ca-cert -storepass <password> -keypass <password> -noprompt If you are using TLS/SSL encryption, you need to select a method to resolve SSL hostname verification failure. Apache Software Foundation. The Kafka instance has TLS enabled, it uses a certificate signed by letsencrypt, issued to the registered domain. After starting the container, the UI was up but could connect to the Kafka cluster which was said offline. Hosts I have configured a Kafka Cluster with Strimzi. For example Heroku's hosted Kafka service uses certificates to handle client authentication but those certificates do not match the instance hostnames. The Kafka hostname verification feature cannot be used if I searched and searched for a way to be able to bootstrap Kafka clients using vanity DNS names instead of the AWS-generated DNS names for the MSK brokers. When using Kafka 4. Commented Mar 31, 2014 at 11:31. 244. Is it possible to disable SSL certification The zookeeper. When starting Kafka, I am getting the following: A flaw was found in Kroxylicious. server. bat for Windows) as shown below. The address you provide only establishes initial connection. By turning off hostname verification, the client will not be able to verify the identity of the server. ssl. Therefore, you just need to set in server. jks -alias localhost -keyalg RSA -validity {validity} -genkey openssl req -new -x509 -keyout ca-key -out ca-cert -days {validity} keytool -keystore kafka. This loophole can result in an insecure connection, opening the door for potential attacks. Apache Kafka Notable changes in 2. HTTP nodes has this property but I am not able to By default, Kafka clients verify that the hostname in the broker URL and the hostname in the broker certificate match. 2. e. If your certificate has no IP SAN, but DNS SANs (or if no DNS SAN, a Hit enter to search. kafka. See Use the deployer to distribute apps and configuration updates in the Splunk Enterprise Distributed Search manual for more information about using the deployer to push configuration changes to search head cluster members. From Kafka version 2. sh for Linux and api-manager. There is kafka-integrations-dev. This option can be set to true or false. eroji started this conversation in General. Declaration "ssl. org/documentation. Configuring hostname verification¶. After successfully sending messages from producer to consumer, additional configs were added to use SSL rather than PLAINTEXT. https. The reason I'm using Heroku Kafka, which is running 0. 3. Looking for Qlik Talend Support? Click here to log into our Support Portal. By using the library’s kafka-server: ssl. x) is expected to be compatible when version 2. servers" to "<ip>:9093"; try to produce a message to some topic in the broker. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I wonder whether there is a way to disable hostname verification for this connector, since I do not see a dedicated configuration option like some other connectors have. SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG, "") The verification of the certificate identity is performed against what the client requests. Based on that secret, I managed to publish messages to MSK (I think). CertificateExc I used simple producer on Windows, but when I tried it to run on Ubuntu I got: SSL handshake failed: error:0A000086:SSL routines::certificate verify failed: broker certificate could not be verified, The new Producer and Consumer clients support security for Kafka versions 0. SSL hostname verification should match the IP address in the SAN of the certificate, not a resolved DNS name. I also have the truststore ca files including: certificate. default: https importance: low. I had a similar issue and that's how I fixed it. Proposed Changes Client code change : Apache Kafka ; Tools ; kafka-replica-verification ; kafka-replica-verification¶. local, which is essentially combining the pod ip and client service. com DNS name for NLB. 2. kafka-lab. In java this can be done with ALLOW_ALL_HOSTNAME_VERIFIER. I guess here you should have CN=localhost. Last-mile integration is essential for delivering real-time Kafka data to mobile, web, and desktop applications, addressing challenges that go beyond Kafka’s typical A basic Confluent-Kafka producer and consumer have been created to send plaintext messages. common. Options¶ $ . Online Help Keyboard Shortcuts Feed Builder What’s new KIP-302 introduced "use_all_dns_ips" value for client. mwe iqk ylflb omm whb iwhgeyq ziacg ueehih uprylba stjkts