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Re: [libvirt] [PATCH 0/2] Fix issue with attempting to use polkit



ping?

Tks -

John

On 05/11/2017 11:04 AM, John Ferlan wrote:
> The "issue" is when using a remote URI and authn when attempting to connect
> to the local system when a local URI and usage of pkttyagent was "expected"
> for local authn.
> 
> The current bug is:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1374126
> 
> which was "forked off" from:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=986365
> 
> which added the support for pkttyagent processing for "local" authn when
> the GUI option wasn't available (e.g. when ssh localhost, run virsh) in
> order to perform the authn of the user.
> 
> This is one of those "either" patch 1 or patch 2 will fix the problem,
> but I really couldn't decide which I liked better. I'm leaning towards
> the second one only because of the one authn failure; however, I'm not
> sure I like the escape path comparison to ":///". 
> 
> With only the first patch one would get two challenge/responses before
> failure, e.g.:
> 
> $ virsh -c qemu+ssh://someuser localhost/system list --all
> someuser localhost's password: 
> someuser localhost's password: 
> error: failed to connect to the hypervisor
> error: authentication unavailable: no polkit agent available to authenticate action 'org.libvirt.unix.manage'
> $
> 
> With the second patch one would get one challenge/reponse before failure e.g.:
> 
> $ virsh -c qemu+ssh://someuser localhost/system list --all
> someuser localhost's password: 
> error: failed to connect to the hypervisor
> error: authentication unavailable: no polkit agent available to authenticate action 'org.libvirt.unix.manage'
> $ 
> 
> Going with #2 restores essentially older (e.g. 1.3.4) processing when the
> pkttyagent processing loop didn't exist.
> 
> The challenge/response in either case comes from ssh and is successful;
> however, code in remoteDispatchAuthList doesn't let a non root user to
> take this URI option for a local authn/authz because the callerUid is
> not 0 (root). Although, I suppose it would be possible to check whether
> the @callerUid was authorized (e.g. part of some group), but that I think
> "outside" the scope of what the bz is reporting, so I didn't take that route.
> 
> The reality is the bug is mostly a problem for non UI type processing
> where providing that ctrl-c to quit isn't as likely/possible.
> 
> John Ferlan (2):
>   virsh: Track when create pkttyagent
>   virsh: Don't attempt polkit processing for non local authn/authz
> 
>  tools/virsh.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 


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