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Authentication for Hadoop HTTP web-consoles
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Authentication for Hadoop HTTP web-consoles
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* Introduction
This document describes how to configure Hadoop HTTP web-consoles to
require user authentication.
By default Hadoop HTTP web-consoles (JobTracker, NameNode, TaskTrackers
and DataNodes) allow access without any form of authentication.
Similarly to Hadoop RPC, Hadoop HTTP web-consoles can be configured to
require Kerberos authentication using HTTP SPNEGO protocol (supported
by browsers like Firefox and Internet Explorer).
In addition, Hadoop HTTP web-consoles support the equivalent of
Hadoop's Pseudo/Simple authentication. If this option is enabled, user
must specify their user name in the first browser interaction using the
user.name query string parameter. For example:
<<<http://localhost:50030/jobtracker.jsp?user.name=babu>>>.
If a custom authentication mechanism is required for the HTTP
web-consoles, it is possible to implement a plugin to support the
alternate authentication mechanism (refer to Hadoop hadoop-auth for details
on writing an <<<AuthenticatorHandler>>>).
The next section describes how to configure Hadoop HTTP web-consoles to
require user authentication.
* Configuration
The following properties should be in the <<<core-site.xml>>> of all the
nodes in the cluster.
<<<hadoop.http.filter.initializers>>>: add to this property the
<<<org.apache.hadoop.security.AuthenticationFilterInitializer>>> initializer
class.
<<<hadoop.http.authentication.type>>>: Defines authentication used for the
HTTP web-consoles. The supported values are: <<<simple>>> | <<<kerberos>>> |
<<<#AUTHENTICATION_HANDLER_CLASSNAME#>>>. The dfeault value is <<<simple>>>.
<<<hadoop.http.authentication.token.validity>>>: Indicates how long (in
seconds) an authentication token is valid before it has to be renewed.
The default value is <<<36000>>>.
<<<hadoop.http.authentication.signature.secret.file>>>: The signature secret
file for signing the authentication tokens. The same secret should be used
for all nodes in the cluster, JobTracker, NameNode, DataNode and TastTracker.
The default value is <<<${user.home}/hadoop-http-auth-signature-secret>>>.
IMPORTANT: This file should be readable only by the Unix user running the
daemons.
<<<hadoop.http.authentication.cookie.domain>>>: The domain to use for the
HTTP cookie that stores the authentication token. In order to
authentiation to work correctly across all nodes in the cluster the
domain must be correctly set. There is no default value, the HTTP
cookie will not have a domain working only with the hostname issuing
the HTTP cookie.
IMPORTANT: when using IP addresses, browsers ignore cookies with domain
settings. For this setting to work properly all nodes in the cluster
must be configured to generate URLs with <<<hostname.domain>>> names on it.
<<<hadoop.http.authentication.simple.anonymous.allowed>>>: Indicates if
anonymous requests are allowed when using 'simple' authentication. The
default value is <<<true>>>
<<<hadoop.http.authentication.kerberos.principal>>>: Indicates the Kerberos
principal to be used for HTTP endpoint when using 'kerberos'
authentication. The principal short name must be <<<HTTP>>> per Kerberos HTTP
SPNEGO specification. The default value is <<<HTTP/_HOST@$LOCALHOST>>>,
where <<<_HOST>>> -if present- is replaced with bind address of the HTTP
server.
<<<hadoop.http.authentication.kerberos.keytab>>>: Location of the keytab file
with the credentials for the Kerberos principal used for the HTTP
endpoint. The default value is <<<${user.home}/hadoop.keytab>>>.i