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Zookeeper >> mail # dev >> Accessing ZK nodes from pluggable auth module

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Re: Accessing ZK nodes from pluggable auth module
Ok, so I plumbed a ZKDatabase into the auth plugins. I do this by adding a
setter to the AuthenticationProvider interface that is called after
construction so that I can use the current method to construct the
AuthProviders in the ProviderRegistry. I also added a ZooKeeperServer arg
to both ProviderRegistry.initialize() and ProviderRegistry.getProvider().
All the places where getProvider is called happened to have a
ZooKeeperServer object available for the passing. I also added an
implementation that does nothing for the setter to each of the existing

The cool thing is that I get access to the ZKDatabase object on the system.
This allows me to drive auth decisions from the ZKDatabase.

Would a patch for this plumbing be interesting in an of itself?


On Tue, Jul 31, 2012 at 2:37 PM, Warren Turkal <[EMAIL PROTECTED]> wrote:

> On Tue, Jul 31, 2012 at 2:02 PM, Patrick Hunt <[EMAIL PROTECTED]> wrote:
> > On Mon, Jul 30, 2012 at 11:04 AM, Warren Turkal <[EMAIL PROTECTED]> wrote:
> > > I'm sure this is a really newbie type question, but I couldn't find
> docs
> > on
> > > how to do this.
> > >
> > > I am researching making a pluggable auth module. Is there any way to
> > access
> > > data in zookeeper nodes from a pluggable auth module? I'd like to store
> > the
> > > auth data within a collection of zookeeper nodes.
> > >
> >
> > We don't provide for this. Wouldn't you need auth for those znodes in
> > order to provide auth? Seems like a circular problem...
> >
> The auth can be overridden by other methods just like normally can happen
> so the auth for these nodes could come from the digest scheme instead of
> this module. Here's a description of the method I am trying to implement.
> I want to map a machine (via hostname) to a machine owner. For example, the
> following nodes would exist in the zookeeper with the following contents:
>    - /authdb/owner_principal_machines/ops-full:
>    u23-r8.region1.localdomain
>    u24-r23.region1.localdomain
>    - /authdb/owner_principal_machines/ops-n00b:
>    u12-r7.region1.localdomain
>    u13-r8.region1.localdomain
> If the machine u23-r8.region1.localdomain (owned by dbmaster according to
> the nodes above) connects to zookeeper, I would like it to be able to do
> the CLI equivalent of "addauth authdb" to authenticate as the dbmaster
> role.
> For flexibility, there are also hierarchical roles, which are also
> represented with nodes. Those nodes would look like the following:
>    - /authdb/principal_children/ops
>    ops-full
>    ops-limited
>    - /authdb/principal_children/ops-app1
>    ops
>    - /authdb/principal_parents/ops-full
>    ops
>    ops-app1
>    - /authdb/principal_parents/ops-limited
>    ops
>    ops-app1
> Note that each of the nodes is a full expansion so that only one node needs
> to be consulted when determining a match for an id to an ACL.
> These particular nodes would indicate that any machines owned by the
> "ops-full" or "ops-limited" would also match the when the ACL was for the
> "ops" id as well as their own names.
> Perhaps open a client connection from the auth provider itself? (i'm
> > not sure if this would work, I don't think anyone ever tried it)
> >
> Is there any way to get the configuration information so that I can get the
> server names from there, or is there some other way to discover the server
> names from within the server process so that I don't have to hard code it
> in some other way?
> > > Also, I've been unable to send message to this list from another email
> > > address. I keep getting bounces claiming that the message is spammy. Is
> > > anyone else getting rejected similarly?
> >
> > I haven't heard anything like that. You might check with the Apache
> > infra team, they manage the mailing lists (outside regular
> > moderation).
> >
> Thanks for the info. I sent a message to the dev-owner@z.a.o alias. Will
> that go anywhere useful?
> Thanks,
> wt
> --
> *Warren Turkal*
> Site Reliability Engineer |