Configuring TLS Encryption for Cloudera Manager
Auto-TLS greatly simplifies the process of enabling and managing TLS encryption on your cluster. It automates the creation of an internal certificate authority (CA) and deployment of certificates across all cluster hosts. It can also automate the distribution of existing certificates, such as those signed by a public CA. Adding new cluster hosts or services to a cluster with auto-TLS enabled automatically creates and deploys the required certificates.
For instructions on enabling auto-TLS, see Installing Cloudera Manager, CDH, and Managed Services and Configuring TLS Encryption for Cloudera Manager and CDH Using Auto-TLS .
Auto-TLS is not supported for existing clusters. To enable TLS on an existing cluster, follow the instructions on this page.
When you configure authentication and authorization on a cluster, Cloudera Manager Server sends sensitive information over the network to cluster hosts, such as Kerberos keytabs and configuration files that contain passwords. To secure this transfer, you must configure TLS encryption between Cloudera Manager Server and all cluster hosts.
TLS encryption is also used to secure client connections to the Cloudera Manager Admin Interface, using HTTPS.
Cloudera Manager also supports TLS authentication. Without certificate authentication, a malicious user can add a host to Cloudera Manager by installing the Cloudera Manager Agent software and configuring it to communicate with Cloudera Manager Server. To prevent this, you must install certificates on each agent host and configure Cloudera Manager Server to trust those certificates.
This guide shows how to configure and enable TLS encryption and certificate authentication for Cloudera Manager. The provided examples use an internal certificate authority (CA) to sign all TLS certificates, so this guide also shows you how to establish trust with the CA. (For certificates signed by a trusted public CA, establishing trust is not necessary, because the Java Development Kit (JDK) already trusts them.)
Use this guide to enable TLS encryption and certificate authentication for Cloudera Manager:
Generate TLS Certificates
The following procedure assumes that an internal certificate authority (CA) is used, and shows how to establish trust for that internal CA. If you are using a trusted public CA (such as Symantec, GeoTrust, Comodo, and others), you do not need to explicitly establish trust for the issued certificates, unless you are using an older JDK and a newer public CA. Older JDKs might not trust newer public CAs by default.
On Each Cluster Host:
Complete the following procedure on each cluster host, including the Cloudera Manager Server host.
- Configure your environment to set JAVA_HOME to the Oracle JDK. For example:
export JAVA_HOME=/usr/java/jdk1.8.0_141-cloudera
If you log out of the host before completing this procedure, make sure to set JAVA_HOME again when you log in to complete the steps. - Create the /opt/cloudera/security/pki directory:
sudo mkdir -p /opt/cloudera/security/pki
If you choose to use a different directory, make sure you use the same directory on all cluster hosts to simplify management and maintenance. - Use the keytool utility to generate a Java keystore and certificate signing request (CSR). Replace the OU, O, L, ST, and C entries with the values for your environment. When prompted, use the
same password for the keystore password and key password. Cloudera Manager does not support using different passwords for the key and
keystore.
sudo $JAVA_HOME/bin/keytool -genkeypair -alias $(hostname -f) -keyalg RSA -keystore /opt/cloudera/security/pki/$(hostname -f).jks -keysize 2048 -dname "CN=$(hostname -f),OU=Engineering,O=Cloudera,L=Palo Alto,ST=California,C=US"
sudo $JAVA_HOME/bin/keytool -certreq -alias $(hostname -f) -keystore /opt/cloudera/security/pki/$(hostname -f).jks -file /opt/cloudera/security/pki/$(hostname -f).csr
- Submit the CSR files (for example, cm01.example.com.csr) to your certificate authority to obtain a server certificate.
For security purposes, many commercial CAs ignore requested extensions in a CSR. Make sure that you inform the CA that you require certificates with both server and client authentication options.
If possible, obtain the certificate in PEM (Base64 ASCII) format. The certificate file is in PEM format if it looks similar to this (some lines omitted):-----BEGIN CERTIFICATE----- MIIDAzCCAesCAQAwgY0xCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh MRIwEAYDVQQHEwlQYWxvIEFsdG8xETAPBgNVBAoTCENsb3VkZXJhMRQwEgYDVQQL … tudY0C32LjGjWOg5ALliN9Oy1u2xRKGAVfapbzAZ2rchtlCZc7mtaT6BXgW8S+Db 0HhuObn1/8TL4Ho9G+KlJB3MWik2oEbOvQt0rBidMr9qaNX86m0i7pouXZelZ5c5 UnDPtrhW6A== -----END CERTIFICATE-----
If your issued certificate is in binary (DER) format, convert it to PEM format.
- After you have received the signed certificate, copy the signed certificate to the following location:
/opt/cloudera/security/pki/$(hostname -f).pem
- Inspect the signed certificate to verify that both server and client authentication options are present:
openssl x509 -in /opt/cloudera/security/pki/$(hostname -f).pem -noout -text
Look for output similar to the following:
X509v3 Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
If the certificate does not have both TLS Web Server Authentication and TLS Web Client Authentication listed in the X509v3 Extended Key Usage section, re-submit the CSR to the CA, and request that they generate a certificate that can be used for both server and client authentication.
- Copy the root and intermediate CA certificates to /opt/cloudera/security/pki/rootca.pem and /opt/cloudera/security/pki/intca.pem on each host. If you have a concatenated file containing the root CA and an intermediate CA certificate, split the file along the END CERTIFICATE/BEGIN CERTIFICATE boundary into individual files. If there are multiple intermediate CA certificates, use unique file names such as intca-1.pem, intca-2.pem, and so on.
- Copy the JDK cacerts file to jssecacerts as follows:
sudo cp $JAVA_HOME/jre/lib/security/cacerts $JAVA_HOME/jre/lib/security/jssecacerts
Note: The default password for the cacerts file is changeit. The same applies to the jssecacerts file if you copied it from the cacerts before changing the password. Cloudera recommends changing these passwords by running the following commands:$JAVA_HOME/bin/keytool -storepasswd -keystore $JAVA_HOME/jre/lib/security/cacerts
$JAVA_HOME/bin/keytool -storepasswd -keystore $JAVA_HOME/jre/lib/security/jssecacerts
The Oracle JDK uses the jssecacerts file for its default truststore if it exists. Otherwise, it uses the cacerts file. Creating the jssecacerts file allows you to trust an internal CA without modifying the cacerts file that is included with the JDK.
Note: If you upgrade your JDK, make sure to copy your existing jssecacerts file to the new JDK (under $JAVA_HOME/jre/lib/security). - Import the root CA certificate into the JDK truststore.
sudo $JAVA_HOME/bin/keytool -importcert -alias rootca -keystore $JAVA_HOME/jre/lib/security/jssecacerts -file /opt/cloudera/security/pki/rootca.pem
If you see a message like the following, enter yes to continue:
Trust this certificate? [no]: yes
You must see the following response verifying that the certificate has been properly imported:Certificate was added to keystore
- Append the intermediate CA certificate to the signed host certificate, and then import it into the keystore. Make sure that you use the append operator (>>) and not the overwrite operator (>):
sudo cat /opt/cloudera/security/pki/intca.pem >> /opt/cloudera/security/pki/$(hostname -f).pem
sudo $JAVA_HOME/bin/keytool -importcert -alias $(hostname -f) -file /opt/cloudera/security/pki/$(hostname -f).pem -keystore /opt/cloudera/security/pki/$(hostname -f).jks
If you see a message like the following, enter yes to continue:
... is not trusted. Install reply anyway? [no]: yes
You must see the following response verifying that the certificate has been properly imported:Certificate reply was installed in keystore
If you do not see this response, contact Cloudera Support.
- Create symbolic links (symlink) for the certificate and keystore files:
sudo ln -s /opt/cloudera/security/pki/$(hostname -f).pem /opt/cloudera/security/pki/agent.pem
This allows you to use the same /etc/cloudera-scm-agent/config.ini file on all agent hosts rather than maintaining a file for each agent.
On the Cloudera Manager Server Host
sudo ln -s /opt/cloudera/security/pki/$(hostname -f).jks /opt/cloudera/security/pki/server.jks
Configure TLS for the Cloudera Manager Admin Console
Minimum Required Role: Cluster Administrator (also provided by Full Administrator)
Use the following procedure to enable TLS encryption for the Cloudera Manager Server admin interface. Make sure you have generated the host certificate as described in Generate TLS Certificates.
Step 1: Enable HTTPS for the Cloudera Manager Admin Console
- Log in to the Cloudera Manager Admin Console.
- Select .
- Select the Security category.
- Configure the following TLS settings:
Property Description Cloudera Manager TLS/SSL Server JKS Keystore File Location The complete path to the keystore file. For example: /opt/cloudera/security/pki/server.jks
Cloudera Manager TLS/SSL Server JKS Keystore File Password The password for the /opt/cloudera/security/jks/server.jks keystore. Use TLS Encryption for Admin Console Check this box to enable TLS encryption for Cloudera Manager. - Enter a Reason for Change, then click Save Changes to save the settings.
Step 2: Specify SSL Truststore Properties for Cloudera Management Services
When enabling TLS for the Cloudera Manager Server admin interface, you must set the Java truststore location and password in the Cloudera Management Services configuration. Otherwise, roles such as Host Monitor and Service Monitor cannot connect to Cloudera Manager Server and will not start.
Configure the path and password for the $JAVA_HOME/jre/lib/security/jssecacerts truststore that you created earlier. Make sure that you have created this file on all hosts, including the Cloudera Management Service hosts, as instructed in Generate TLS Certificates.
- Open the Cloudera Manager Administration Console and go to the Cloudera Management Service service.
- Click the Configuration tab.
- Select .
- Select .
- Edit the following TLS/SSL properties according to your cluster configuration.
Property Description TLS/SSL Client Truststore File Location The path to the client truststore file used in HTTPS communication. This truststore contains certificates of trusted servers, or of Certificate Authorities trusted to identify servers. For this example, set the value to: <JAVA_HOME>/jre/lib/security/jssecacerts
Replace <JAVA_HOME> with the path to the Oracle JDK.Cloudera Manager Server TLS/SSL Certificate Trust Store Password The password for the truststore file. - Enter a Reason for change, and then click Save Changes to commit the changes.
Step 3: Restart Cloudera Manager and Services
You must restart both Cloudera Manager Server and the Cloudera Management Service for TLS encryption to work. Otherwise, the Cloudera Management Services (such as Host Monitor and Service Monitor) cannot communicate with Cloudera Manager Server.
- Restart the Cloudera Manager Server by running the following command on the Cloudera Manager Server host:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-server
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-server restart
- RHEL 7 compatible:
- After the restart completes, connect to the Cloudera Manager Admin Console using the HTTPS URL (for example: https://cm01.example.com:7183). If you used an internal CA-signed certificate, you must configure your browser to trust the certificate. Otherwise, you will see a warning in your browser any time you access the Cloudera Manager Administration Console. By default, certificates issued by public commercial CAs are trusted by most browsers, and no additional configuration is necessary if your certificate is signed by one of them.
- Restart the Cloudera Management Service ( ).
Configure TLS for Cloudera Manager Agents
Minimum Required Role: Cluster Administrator (also provided by Full Administrator)
Use the following procedure to encrypt the communication between Cloudera Manager Server and Cloudera Manager Agents:
Step 1: Enable TLS Encryption for Agents in Cloudera Manager
Configure the TLS properties for Cloudera Manager Agents.
- Log in to the Cloudera Manager Admin Console.
- Select .
- Select the Security category.
- Select the Use TLS Encryption for Agents option.
- Enter a Reason for change, and then click Save Changes to commit the changes.
Step 2: Enable TLS on Cloudera Manager Agent Hosts
- On each agent host (including the Cloudera Manager Server host, which also has an agent), open the /etc/cloudera-scm-agent/config.ini configuration file
and set the use_tls parameter in the [Security] section as follows:
use_tls=1
Alternatively, you can edit the config.ini file on one host, and then copy it to the other hosts because this file by default does not contain host-specific information. If you have modified properties such as listening_hostname or listening_ip address in config.ini, you must edit the file individually on each host.
Step 3: Restart Cloudera Manager Server and Agents
- Restart the Cloudera Manager Server by running the following command on the Cloudera Manager Server host:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-server
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-server restart
- RHEL 7 compatible:
- On each agent host (including the Cloudera Manager Server host), restart the Cloudera Manager agent service:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-agent
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-agent restart
- RHEL 7 compatible:
Step 4: Verify that the Cloudera Manager Server and Agents are Communicating
In the Cloudera Manager Admin Console, go to Last Heartbeat column after restarting the agents, TLS encryption is working properly.
. If you see successful heartbeats reported in theEnable Server Certificate Verification on Cloudera Manager Agents
Minimum Required Role: Cluster Administrator (also provided by Full Administrator)
If you have completed the previous sections, communication between Cloudera Manager server and the agents is encrypted, but the certificate authenticity is not verified. For full security, you must configure the agents to verify the Cloudera Manager server certificate. If you are using a server certificate signed by an internal certificate authority (CA), you must configure the agents to trust that CA:
- On each agent host (including the Cloudera Manager Server host), open the /etc/cloudera-scm-agent/config.ini configuration file, and then uncomment and
set the following property:
verify_cert_file=/opt/cloudera/security/pki/rootca.pem
Alternatively, you can edit the config.ini file on one host, and then copy it to the other hosts because this file by default does not contain host-specific information. If you have modified properties such as listening_hostname or listening_ip address in config.ini, you must edit the file individually on each host.
- Restart the Cloudera Manager agents. On each agent host (including the Cloudera Manager Server host), run the following command:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-agent
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-agent restart
- RHEL 7 compatible:
- Restart the Cloudera Management Service ( ).
- Verify that the Cloudera Manager server and agents are communicating. In the Cloudera Manager Admin Console, go to Last Heartbeat column after restarting the agents and management service, TLS verification is working properly. If not, check the agent log (/var/log/cloudera-scm-agent/cloudera-scm-agent.log) for errors. . If you see successful heartbeats reported in the
Configure Agent Certificate Authentication
Without certificate authentication, a malicious user can add a host to Cloudera Manager by installing the Cloudera Manager agent software and configuring it to communicate with Cloudera Manager Server. To prevent this, you must configure Cloudera Manager to trust the agent certificates.
- Step 1: Export the Private Key to a File
- Step 2: Create a Password File
- Step 3: Configure the Agent to Use Private Keys and Certificates
- Step 4: Enable Agent Certificate Authentication
- Step 5: Restart Cloudera Manager Server and Agents
- Step 6: Verify that Cloudera Manager Server and Agents are Communicating
Step 1: Export the Private Key to a File
On each Cloudera Manager Agent host, use the keytool utility to export the private key and certificate to a PKCS12 file, which can then be split up into individual key and certificate files using the openssl command:
- Export the private key and certificate:
sudo $JAVA_HOME/bin/keytool -importkeystore -srckeystore /opt/cloudera/security/pki/$(hostname -f).jks -destkeystore /opt/cloudera/security/pki/$(hostname -f)-key.p12 -deststoretype PKCS12 -srcalias $(hostname -f)
- Use the openssl command to export the private key into its own file:
sudo openssl pkcs12 -in /opt/cloudera/security/pki/$(hostname -f)-key.p12 -nocerts -out /opt/cloudera/security/pki/$(hostname -f).key
- Create a symbolic link for the .key file:
sudo ln -s /opt/cloudera/security/pki/$(hostname -f).key /opt/cloudera/security/pki/agent.key
This allows you to use the same /etc/cloudera-scm-agent/config.ini file on all agent hosts rather than maintaining a file for each agent.
Step 2: Create a Password File
The Cloudera Manager agent obtains the password from a text file, not from a command line parameter or environment variable. The password file allows you to use file permissions to protect the password. For example, run the following commands on each Cloudera Manager Agent host, or run them on one host and copy the file to the other hosts:
- Use a text editor to create a file called /etc/cloudera-scm-agent/agentkey.pw that contains the password.
- Change ownership of the file to root:
sudo chown root:root /etc/cloudera-scm-agent/agentkey.pw
- Change the permissions of the file:
sudo chmod 440 /etc/cloudera-scm-agent/agentkey.pw
Step 3: Configure the Agent to Use Private Keys and Certificates
Property | Example Value | Description |
---|---|---|
client_key_file | /opt/cloudera/security/pki/agent.key | Path to the private key file. |
client_keypw_file | /etc/cloudera-scm-agent/agentkey.pw | Path to the private key password file. |
client_cert_file | /opt/cloudera/security/pki/agent.pem | Path to the client certificate file. |
Copy the file to all other cluster hosts. If you have modified properties such as listening_hostname or listening_ip address in config.ini, you must edit the file individually on each host.
Step 4: Enable Agent Certificate Authentication
- Log in to the Cloudera Manager Admin Console.
- Select .
- Click the Security category.
- Configure the following TLS settings:
Setting Description Use TLS Authentication of Agents to Server Select this option to enable TLS authentication of agents to the server. Cloudera Manager TLS/SSL Certificate Trust Store File Specify the full filesystem path to the jssecacerts file located on the Cloudera Manager Server host. For this example, set the value to: <JAVA_HOME>/jre/lib/security/jssecacerts
Replace <JAVA_HOME> with the path to the Oracle JDK.Cloudera Manager TLS/SSL Certificate Trust Store Password Specify the password for the jssecacerts truststore. - Enter a Reason for change, and then click Save Changes to commit the changes.
Step 5: Restart Cloudera Manager Server and Agents
- On the Cloudera Manager server host, restart the Cloudera Manager server:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-server
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-server restart
- RHEL 7 compatible:
- On every agent host, restart the Cloudera Manager agent:
- RHEL 7 compatible:
sudo systemctl restart cloudera-scm-agent
- RHEL 6 compatible, SLES, Ubuntu:
-
sudo service cloudera-scm-agent restart
- RHEL 7 compatible:
Step 6: Verify that Cloudera Manager Server and Agents are Communicating
In the Cloudera Manager Admin Console, go to Last Heartbeat column after restarting the agents and server, TLS certificate authentication is working properly. If not, check the agent log (/var/log/cloudera-scm-agent/cloudera-scm-agent.log) for errors.
. If you see successful heartbeats reported in theFor example, you might see the following error:
WrongHost: Peer certificate commonName does not match host, expected 192.0.2.155, got cdh-1.example.com [02/May/2018 15:04:15 +0000] 4655 MainThread agent ERROR Heartbeating to 192.0.2.155:7182 failed
For this scenario, make sure that your DNS and /etc/hosts file are configured correctly, and that your server_host parameter in /etc/cloudera-scm-agent/config.ini uses the Cloudera Manager Server hostname, and not IP address.
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