[openstack-dev] Python overhead for rootwrap

Thierry Carrez thierry at openstack.org
Thu Jul 25 21:43:31 UTC 2013

Russell Bryant wrote:
> On 07/25/2013 04:40 PM, Mike Wilson wrote:
>> In my opinion:
>> 1. Stop using rootwrap completely and get strong argument checking
>> support into sudo (regex).
>> 2. Some sort of long lived rootwrap process, either forked by the
>> service that want's to shell out or a general purpose rootwrapd type thing.
>> I prefer #1 because it's surprising that sudo doesn't do this type of
>> thing already. It _must_ be something that everyone wants. But #2 may be
>> quicker and easier to implement, my $.02.
> We could do #1 and keep rootwrap around as the fallback if the local
> version of sudo doesn't support what we need.

It's not just regexp support, rootwrap basically lets you extend the
rules to be openstack-specific (custom filters). That feature is not
widely used yet but is the key to fine-grained privilege escalation in
the future. Also getting something new into sudo is (for good reasons)
quite difficult.

I would rather support solution 3: create a single, separate  executable
that does those 20 things that need to be done (can be a shell script
with some logic in it), and have rootwrap call that *once*. That way you
increase speed by 20 times without dumping the security model.


Thierry Carrez (ttx)

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