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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4348) Adding service-level authorization to Hadoop
Date Thu, 30 Oct 2008 17:02:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644039#action_12644039
] 

Enis Soztutar commented on HADOOP-4348:
---------------------------------------

@Sanjay
bq.   1. rather then invent new authorization layers use JAAS
bq.   2. we should have used JAAS in the first place when we did UGI.
Exactly.

@Arun, @Sanjay
Yes I also share the wisdom that enabling security manager is an overkill, and the policy
file's syntax is ugly.

I am attaching a patch for review which does the job, w/o enabling security manager. The actual
security manager's implementation is to delegate all the work to AccessController. The patch
uses accesscontroller directly so SM is not explicitly enabled. With this schema, security
checks only occur as in the patch. AFAIK, all the core java code use SM, and since it is not
enabled, performance does not suffer. Of course we should check this before patch is committed.

Patch introduces a HaddopPolicy implementation, which reads its configuration from an XML
file. The schema of the file is relatively simple, and extensible for further JAAS based authorization
checks. Unfortunately, the permissions/principals model does not fit perfectly to be configured
in the property based configuration files, so I guess we have to include a new format.



> 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
>
>         Attachments: HADOOP-4348_0_20081022.patch, jaas_service_v1.patch, jaas_service_v2.patch
>
>
> 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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