[Lava-users] lavacli: adding remote worker requires superuser

Kevin Hilman khilman at baylibre.com
Wed Aug 29 16:10:48 UTC 2018


On Tue, Aug 28, 2018 at 11:46 PM Neil Williams <neil.williams at linaro.org> wrote:
>
> On Tue, 28 Aug 2018 at 19:49, Kevin Hilman <khilman at baylibre.com> wrote:
>>
>> On Tue, Aug 28, 2018 at 12:41 AM Neil Williams <neil.williams at linaro.org> wrote:
>> >
>> > On Tue, 21 Aug 2018 at 22:46, Kevin Hilman <khilman at baylibre.com> wrote:
>> >>
>> >> Hello,
>> >>
>> >> When trying to use lavacli to add a remote worker, it works fine if
>> >> the user is a superuser.
>> >
>> >
>> > Adding remote workers to an instance would be an easy way to DDOS an instance by swamping the ZMQ ports with fake attempts - the process needs to be under the control of the admins of the instance.
>> >
>> > If the remote worker is properly configured, it will register itself automatically - this is why encryption of the master:slave communication is so important. A LAVA master which is visible to the internet should always use encryption.
>>
>> All masters and slaves are in control of the admins and encryption is
>> enabled.  The per-user permissions still do not work.
>>
>> However, all of this still begs the question: why do those per-user
>> permissions even exist if they don't do anything because superuser
>> privileges are required?  If that's a hard requirement, shouldn't
>> those permissions just be removed so it's not confusing for admins?
>>
>> > In most cases, the lavacli workers add command isn't required.
>>
>> Ahh... so, IIUC, when a new worker connects, it automatically adds
>> itself. so a "workers add" command isn't needed?
>
>
> Yes - with an up to date lava-master, (2018.5 and later IIRC, possibly a release or two earlier, I'd have to check) , the process is automatic.

Thanks, that seems to work.

The next blocker to having a non-superuser remote worker is the adding
the dispatcher_ip, which also requires superuser privileges[1], and
doesn't appear to have an individual user permission ACL.

Assuming ZMQ encryption between master/slave, is it possible to have a
remote worker without admin privileges?  Is this something that has
been validated?

Kevin

[1]
lab-slave-0_1  | Add dispatcher_ip 192.168.66.1 to lab-slave-0
lab-slave-0_1  | Traceback (most recent call last):
lab-slave-0_1  |   File "/usr/local/bin/setdispatcherip.py", line 11,
in <module>
lab-slave-0_1  |     server.scheduler.workers.set_config("%s" %
sys.argv[2], "dispatcher_ip: %s" % sys.argv[3])
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 1243, in _call_
lab-slave-0_1  |     return self._send(self._name, args)
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 1602,
in __request
lab-slave-0_1  |     verbose=self.__verbose
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 1283, in request
lab-slave-0_1  |     return self.single_request(host, handler,
request_body, verbose)
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 1316,
in single_request
lab-slave-0_1  |     return self.parse_response(response)
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 1493,
in parse_response
lab-slave-0_1  |     return u.close()
lab-slave-0_1  |   File "/usr/lib/python2.7/xmlrpclib.py", line 800, in close
lab-slave-0_1  |     raise Fault(**self._stack[0])
lab-slave-0_1  | xmlrpclib.Fault: <Fault 403: "User 'nonadminuser' is
not superuser.">


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