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https://issues.apache.org/jira/browse/HADOOP-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652289#action_12652289
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Arun C Murthy commented on HADOOP-4348:
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Nigel - responses inline:
bq. what happens when hadoop-policy.xml syntax is bad?
Illegal schema is handled by Configuration itself and the ACL parser handles
incorrect user/groups.
bq. what happens when the hadoop-policy.xml file is missing but auth is enabled?
Configuration will fail if it cannot 'load' the resource.
bq. what happens when the hadoop-policy.xml file is world/group writable?
Hmm... it's assumed that the cluster configs are handled correctly by the admin.
bq. what new command-line utiltities will be provided?
I'll update the spec - the proposal is to add a '-refresh-auth-policy' switch
to dfsadmin, and a similar one to a new command 'mradmin'.
$ bin/hadoop dfsadmin -refresh-auth-policy
$ bin/hadoop mradmin -refresh-auth-policy
I'll update the test plan too.
> 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,
> HADOOP-4348_1_20081201.patch, jaas_service_v1.patch, jaas_service_v2.patch,
> jaas_service_v3.patch, ServiceLevelAuthorization.pdf
>
>
> 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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