[libvirt-users] [Libvirt Users]how to provide password authentication for qemu driver

[Daniel P. Berrange]

On Mon, Apr 27, 2015 at 05:13:36AM -0700, Dhaval_Shah1 at dell.com wrote:
> Dell Customer Communication
> Hi All,
> 
> I am using
> 
> Compiled against library: libvirt 1.2.9
> Using library: libvirt 1.2.9
> Using API: QEMU 1.2.9
> Running hypervisor: QEMU 2.1.2
> 
> I want user to provide username and password authentication to virConnectPtr
> virConnectOpenAuth(const char *name,
>                    virConnectAuthPtr auth,
>                    unsigned int flags)  to login remotely for the qemu hypervisor.
> 
> But it is not taking user provided username and driver. Because
> internally it is calling below qemu driver function,
> 
> static virDrvOpenStatus qemuConnectOpen(virConnectPtr conn,
>                                         virConnectAuthPtr auth ATTRIBUTE_UNUSED,
>                                         unsigned int flags)
> 
> so it is not taking any user provided auth parameters and it is internally
> calling separate function for prompting password. I don't want to provide
> password here.
> In case of windows HyperV it is working fine as it takes auth parameters
> but for Qemu Hypervisor I am facing this issue since here the auth
> parameters as marked as ATTRIBUTE_UNUSED.

Actually your intepretation of the callpath is not quite right. The
virConnectOpenAuth() method in libvirt.so will end up calling
the remoteConnectOpen() method in src/remote/remote_driver.c.
This opens an RPC connection to libvirtd, performs authentication,
and then calls qemuConnectOpen(). So from that sequence it is the
remoteConnectOpen() method that deals with passwords/usernames,
not qemuConnectOpen().

If you want to get an idea how to provide username/password via the
callback, take a look at the virConnectAuthCallbackDefault() method
in src/libvirt.c which is the default impl that just prompts on the
terminal console.

Regards,
Daniel
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