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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4348) Adding service-level authorization to Hadoop
Date Tue, 07 Oct 2008 04:23:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637365#action_12637365
] 

Hemanth Yamijala commented on HADOOP-4348:
------------------------------------------

Per HADOOP-3698, we specify authorized user lists for each operation using a configuration
variable such as {{mapred.queue.queue-name.operation-name}} in hadoop-site or hadoop-default.
The format is something like this:
{code:xml}
<property>
  <name>mapred.queue.default.acl-administer-jobs</name>
  <value>alice,bob group1,group2</value>
</property>
{code}

'*' is used to specify 'all allowed'. Blank is used to specify none allowed.

I meant these kind of interfaces - to the administrator, and think they should be consistent
between the ACLs feature and what we choose to do here in this JIRA.

> Adding service-level authorization to Hadoop
> --------------------------------------------
>
>                 Key: HADOOP-4348
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4348
>             Project: Hadoop Core
>          Issue Type: New Feature
>            Reporter: Kan Zhang
>            Assignee: Arun C Murthy
>             Fix For: 0.20.0
>
>
> Service-level authorization is the initial checking done by a Hadoop service to find
out if a connecting client is a pre-defined user of that service. If not, the connection or
service request will be declined. This feature allows services to limit access to a clearly
defined group of users. For example, service-level authorization allows "world-readable" files
on a HDFS cluster to be readable only by the pre-defined users of that cluster, not by anyone
who can connect to the cluster. It also allows a M/R cluster to define its group of users
so that only those users can submit jobs to it.
> Here is an initial list of requirements I came up with.
>     1. Users of a cluster is defined by a flat list of usernames and groups. A client
is a user of the cluster if and only if her username is listed in the flat list or one of
her groups is explicitly listed in the flat list. Nested groups are not supported.
>     2. The flat list is stored in a conf file and pushed to every cluster node so that
services can access them.
>     3. Services will monitor the modification of the conf file periodically (5 mins interval
by default) and reload the list if needed.
>     4. Checking against the flat list is done as early as possible and before any other
authorization checking. Both HDFS and M/R clusters will implement this feature.
>     5. This feature can be switched off and is off by default.
> I'm aware of interests in pulling user data from LDAP. For this JIRA, I suggest we implement
it using a conf file. Additional data sources may be supported via new JIRA's.

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