Re: [Qemu-devel] Error when attempting to perform TLS NBD connection

[Daniel P. Berrange]

On Tue, Apr 05, 2016 at 09:01:10PM +0100, Alex Bligh wrote:
> When I attempt to connect via TLS like this (using today's qemu master):
> 
>    ./qemu-img info --object 
> tls-creds-x509,id=tls0,dir=../certs,endpoint=client --image-opts 
> driver=nbd,host=127.0.0.1,port=6666,export=foo,tls-creds=tls0
> 
> (command line from Daniel over IRC)
> 
> I get the rather opaque error:
> 
>    qemu-img: Unable to initialize certificate
> 
> and with the patch I sent through I get the not much less opaque error:
> 
>    qemu-img: Unable to initialize certificate: ASN1 parser: Element was not 
> found.
> 
> gdb indicates this is crypto/tlscredsx509.c:399 where 
> gnutls_x509_crt_init(&cert) fails.
> 
> I generated the certificates EXACTLY as per:
>    http://qemu.weilnetz.de/qemu-doc.html#vnc_005fgenerate_005fcert
> (also from Daniel over IRC)
> 
> and the certificates work fine with gnutls-cli and gnutls-server
> 
> I am compiling on and running on Ubuntu Trusty 14.04, and have an up to date
> (for 14.04) gnutls installed.
> 
> $ dpkg --list | fgrep libgnutls26
> ii libgnutls26:amd64  2.12.23-12ubuntu2.4 amd64 GNU TLS library - runtime 
> library
> 
> All the certificates are at:
>   https://gist.github.com/abligh/96425e20fb423d847b8fd4ead298efed
> (no there's nothing secret there)

I've just tested using your certs and they work correctly for me. I have
gnutls-3.4.10-1.fc23.x86_64  on Fedora 23, so either there's something
broken with gnutls 2.x compatibility in general, or there's a specific
bug in your exact version of gnutls. I'll try and investigate further

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|