Configuring TLS/SSL for Hue

Hue as a TLS/SSL Client

Minimum Required Role: Configurator (also provided by Cluster Administrator, Full Administrator)

Hue acts as a TLS/SSL client when communicating with other services such as core Hadoop, HBase, Oozie and Amazon S3. This means Hue must authenticate HDFS, MapReduce, YARN daemons, the HBase Thrift server, and so on. To do so, Hue needs the certificate chains of their hosts in its truststore.

The Hue truststore is a single PEM file that contains the CA root, and all intermediate certificates, to authenticate the certificate installed on each TLS/SSL-enabled server. These servers host the various services with which Hue communicates.

Creating a Hue Truststore File in PEM Format

Server certificates are stored in JKS format and must be converted to PEM. To create the Hue truststore, extract each certificate from its keystore with keytool, convert to PEM format with openssl, and add to the truststore.

  1. Extract the certificate from the keystore of each TLS/SSL-enabled server with which Hue communicates.
    For example, hadoop-server.keystore contains server certificate, foo-1.example.com, and password, example123.
    keytool -exportcert -keystore hadoop-server.keystore -alias foo-1.example.com -storepass example123 -file foo-1.cert
  2. Convert each certificate into a PEM file.
    openssl x509 -inform der -in foo-1.cert > foo-1.pem
  3. Concatenate all the PEM certificates into one PEM file.
    cat foo-1.pem foo-2.pem foo-n.pem ... > hue_trustore.pem

Configuring Hue as a TLS/SSL Client with Cloudera Manager

  1. Go to the Hue service and click the Configuration tab.
  2. Filter by Scope > Hue Server and Category > Security.
  3. Find the property, Hue TLS/SSL Server CA Certificate (PEM Format), or ssl_cacerts.
  4. Enter the path to <hue_truststore>.pem on the host running the Hue web server.
  5. Click Save Changes.
  6. Select Actions > Restart to restart the Hue service.

Configuring Hue as a TLS/SSL Client at the Command Line

For unmanaged deployments only, manually set ssl_cacerts in hue.ini to the path of the <hue_truststore>.pem file:
[desktop]
# Path to default Certificate Authority certificates.
ssl_cacerts=/etc/hue/<hue_truststore>.pem

Hue as a TLS/SSL Server

Hue and other Python-based services expect certificates and keys to be stored in PEM format. You can manage such services with the openssl tool. To configure Hue to use HTTPS, generate a private key and certificate as described in Obtain and Deploy Server Certificate and reuse a host's existing Java keystore by converting it to the PEM format. See Converting JKS Key and Certificate to PEM.

Enabling TLS/SSL for the Hue Server with Cloudera Manager

Minimum Required Role: Configurator (also provided by Cluster Administrator, Full Administrator)

  1. Go to the Hue service and click Configuration.
  2. Filter by Scope > Hue Server and Category > Security.
  3. Edit the following TLS/SSL properties according to your cluster configuration.
    Property Description
    Enable HTTPS Enable HTTPS for the Hue web server.
    Local Path to TLS/SSL Certificate Path to the TLS/SSL certificate on the host running the Hue web server.
    Local Path to TLS/SSL Private Key Path to the TLS/SSL private key on the host running the Hue web server.
    If the private key has a password:
    1. Filter by Scope > Hue-1 (Service-Wide) and Category > Advanced.
    2. Locate the field, Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini.
    3. Add the TLS/SSL password parameter in the [desktop] section:
      [desktop]
      ssl_password=<private_key_password>
      You can also store ssl_password more securely in a script and set this parameter instead:
      ssl_password_script=<your_hue_passwords_script.sh>
      For more, see Storing Hue Passwords in a Script.

    If more than one role group applies to this configuration, edit the value for the appropriate role group. See Modifying Configuration Properties Using Cloudera Manager.

  4. Click Save Changes.
  5. Select Actions > Restart to restart the Hue service.

For more details on configuring Hue with TLS/SSL, see this blog post.

Enabling TLS/SSL for the Hue Server at the Command Line

  1. Enable secure session cookies in hue.ini under [desktop]>[[session]].
    [desktop]
      [[session]]
      secure=true
  2. Edit the following properties in hue.ini under [desktop].
    [desktop]
     ssl_certificate=/path/to/server.cert
     ssl_private_key=/path/to/server.key
     ssl_password=<private_key_password>
    You can store ssl_password more securely in a script and set this parameter instead:
    ssl_password_script=<your_hue_passwords_script.sh>
    For more, see Storing Hue Passwords in a Script.

Enabling Hue TLS/SSL Communication with HiveServer2

In CDH 5.5.x and higher, HiveServer2 is enabled for TLS/SSL communication by default.

By providing a CA certificate, private key, and public certificate, Hue can communicate with HiveServer2 over TLS/SSL. You can now configure the following properties in the [beeswax] section under [[ssl]] in the Hue configuration file, hue.ini.
enabled

Choose to enable/disable TLS/SSL communication for this server.

Default: false

cacerts

Path to Certificate Authority certificates.

Default: /etc/hue/cacerts.pem

validate

Choose whether Hue should validate certificates received from the server.

Default: true

Enabling Hue TLS/SSL Communication with Impala

In CDH 5.5.x and higher, Impala is enabled for TLS/SSL communication by default.

By providing a CA certificate, private key, and public certificate, Hue can communicate with Impala over TLS/SSL. You can configure the following properties in the [impala] section under [[ssl]] in the Hue configuration file, hue.ini.
enabled

Choose to enable/disable TLS/SSL communication for this server.

Default: false

cacerts

Path to Certificate Authority certificates.

Default: /etc/hue/cacerts.pem

validate

Choose whether Hue should validate certificates received from the server.

Default: true

Securing Database Connections using TLS/SSL

Connections vary depending on the database. Hue uses different clients to communicate with each database internally. Client specific options, such as secure connectivity, can be passed through the interface.

For example, for MySQL you can enable TLS/SSL communication by specifying the options configuration property under the desktop>[[database]] section in hue.ini. Here we identify the Certificate Authority (CA) certificate:

[desktop] 
  [[databases]] 
    … 
    options={"ssl":{"ca":"/tmp/ca-cert.pem"}}
You can also identify public and private keys, for example:
options='{"ssl": {"ca": "/tmp/newcerts2/ca.pem", "key": "/tmp/newcerts2/client-key.pem", "cert": "/tmp/newcerts2/client-cert.pem"}}'

Storing Hue Passwords in a Script

In CDH 5.4, Hue added the ability to store passwords in a secure script and pull passwords from stdout. On startup, Hue runs one or more passwords scripts and grabs each password from stdout.

In hue_ini, add the suffix, _script, to any password property and set it equal to the script name. In Cloudera Manager, set these properties in the configuration field, ​Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini. For example:

[desktop]
ldap_username=hueservice
ldap_password_script="/var/lib/hue/<your_hue_passwords_script.sh> ldap_password"
ssl_password_script="/var/lib/hue/<your_hue_passwords_script.sh> ssl_password"

[[ldap]]
bind_password_script="/var/lib/hue/<your_hue_passwords_script.sh> bind_password"

[[database]]
password_script="/var/lib/hue/<your_hue_passwords_script.sh> database"

Store the script in a directory that only the hue user can read, write, and execute. You can have one script per password or one script with parameters for all passwords. Here is an example of a script with parameters for multiple passwords:

#!/bin/bash

SERVICE=$1

if [[ ${SERVICE} == "ldap_password" ]]
then
   echo "password"
fi

if [[ ${SERVICE} == "ssl_password" ]]
then
   echo "password"
fi

if [[ ${SERVICE} == "bind_password" ]]
then
   echo "Password1"
fi

if [[ ${SERVICE} == "database_password" ]]
then
   echo "password"
fi