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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1681) Adjust Authorizor Interface to validate auths instead of retrieving a list
Date Mon, 09 Sep 2013 21:12:52 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762309#comment-13762309
] 

Christopher Tubbs commented on ACCUMULO-1681:
---------------------------------------------

{quote}Actually, I thought the rules for visibilities changed to allow quoted strings which
could contain anything. Regardless, that contains() method is exactly the same as the existing
Authorizations.contains() method.{quote}

Technically, quoting was introduced to avoid the reserved character problem, not to allow
for arbitrary bytes. There's still good reasons to treat this as human-readable. The fact
that it uses bytes for its contains method is incidental to the history of treating everything
as bytes. I don't know that "contains" was ever really considered part of the public API...
it's just a getter to power internal use of the Authorizations object. Since it's there, we
can treat it as public API... for historical reasons, but I'd really want any improvements
to this API (like the addition of an AuthorizationsContainer) to reflect and enforce the human-readable
assumptions, rather than to follow Authorizations.contains(). Since this is something new,
and not simply a modification of something that we're stuck with, it seems like it's a good
opportunity to improve this API all around.

{quote}I'm not sure how I feel exposing the SecurityOperations as a whole to users.{quote}

While the existing backend SecurityOperation (singular for the backend) does provide similar
functionality to the type of centralized "flexing point" that I'd prefer, I'd want something
that is logically more user-centric rather than generically "security" centric. In other words,
something that takes Credentials on the backend and provides a User instance, with methods
like "canPerform(Action)" and "hasAuthorization(Authorization)" and "isAuthenticated()". This
would allow us to prepackage things like an LDAPUserModule or an ZooKeeperUserModule or a
CustomUserModule (that maybe uses Kerberos for authentication, LDAP for authorizations, and
a policy file for permissions).

What I'd really like is for us to come up with a comprehensive solution that implements all
these improvements and push for it to be a major feature of an upcoming release (1.7? maybe
call it 2.0?). Without that comprehensive solution, I'm reluctant to get on board for this
in 1.6.
                
> Adjust Authorizor Interface to validate auths instead of retrieving a list
> --------------------------------------------------------------------------
>
>                 Key: ACCUMULO-1681
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1681
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: John Vines
>            Assignee: John Vines
>             Fix For: 1.6.0
>
>         Attachments: ACCUMULO-1681.patch, ACCUMULO-1681.v2.patch
>
>
> Currently the Authorizor interface is used to request a set of authorizations which then
get checked against the authorizations a user is attempting to use. However, some security
systems only support the ability to validate authorizations/permissions/roles and not provide
a list. That makes these systems (entirely) incompatible with Accumulo when they don't have
to be.
> We should switch the behavior of Accumulo to ask the Authorizor (via SecurityOperations)
if the auths are valid. The existing getAuths functionality will still use that call and would
have potentially limited support, similar to the potentially limited support of any of the
set operations.

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