[libvirt] [PATCH] sasl: Fix authentication when using PLAIN mechanism
Eric Blake
eblake at redhat.com
Thu Nov 21 23:45:32 UTC 2013
On 11/21/2013 10:56 AM, Christophe Fergeau wrote:
> With some authentication mechanism (PLAIN for example), sasl_client_start()
> can return SASL_OK, which translates to virNetSASLSessionClientStart()
> returning VIR_NET_SASL_COMPLETE.
> cyrus-sasl documentation is a bit vague as to what to do in such situation,
> but upstream clarified this a bit in
> http://asg.andrew.cmu.edu/archive/message.php?mailbox=archive.cyrus-sasl&msg=10104
>
> When we got VIR_NET_SASL_COMPLETE after virNetSASLSessionClientStart() and
> if the remote also tells us that authentication is complete, then we should
> end the authentication procedure rather than forcing a call to
> virNetSASLSessionClientStep(). Without this patch, when trying to use SASL
> PLAIN, I get:
> error :authentication failed : Failed to step SASL negotiation: -1
> (SASL(-1): generic failure: Unable to find a callback: 32775)
>
> This patch is based on a spice-gtk patch by Dietmar Maurer.
> ---
> src/remote/remote_driver.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
> index 7181949..e15eeaf 100644
> --- a/src/remote/remote_driver.c
> +++ b/src/remote/remote_driver.c
> @@ -4125,6 +4125,9 @@ remoteAuthSASL(virConnectPtr conn, struct private_data *priv,
> * Even if the server has completed, the client must *always* do at least one step
> * in this loop to verify the server isn't lying about something. Mutual auth */
This code comment is now stale. Can you touch it up?
> for (;;) {
> + if (complete && err == VIR_NET_SASL_COMPLETE)
> + break;
> +
> restep:
Side note: Previously, the code could have used 'continue' instead of
'goto restep'; but now the goto is necessary.
Based on the linked message, the patch makes sense, but I'd still wait
for a review from Dan as someone more familiar with SASL code.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 621 bytes
Desc: OpenPGP digital signature
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20131121/9b647fc5/attachment-0001.sig>
More information about the libvir-list
mailing list