libvirt users - Oct 2016 - How to tell spicy client to use SASL authentication?

I'm using libvirt in desktop environment. Single host machine, pair of
users, a few guest machines. The first thought was that unix socket restricted
to specific group is just enough for authentication. But virsh has the power
like sudo: you could define pool on real device and write anything on it. So I
decided to authenticate with password for each virsh use. I'm using SASL +
saslauthd + PAM for that case.

/etc/sasl2/libvirt.conf:
  mech_list: PLAIN
  pwcheck_method: saslauthd

/etc/sasl2/qemu.conf:
  mech_list: PLAIN
  pwcheck_method: saslauthd

/etc/pam.d/libvirt:
  auth            requisite       pam_listfile.so item=group sense=allow
file=/etc/libvirt/allow_group
  auth            required        pam_tally2.so onerr=succeed
  auth            required        pam_nologin.so
  auth            required        pam_unix.so try_first_pass likeauth nullok
  account         requisite       pam_listfile.so item=group sense=allow
file=/etc/libvirt/allow_group
  account         required        pam_nologin.so
  account         required        pam_unix.so

/etc/pam.d/qemu:
  auth            requisite       pam_listfile.so item=group sense=allow
file=/etc/libvirt/allow_group
  auth            required        pam_tally2.so onerr=succeed
  auth            required        pam_nologin.so
  auth            required        pam_unix.so try_first_pass likeauth nullok
  account         requisite       pam_listfile.so item=group sense=allow
file=/etc/libvirt/allow_group
  account         required        pam_nologin.so
  account         required        pam_unix.so

They are two identical configs for libvirt and for qemu. The first works
flawlessly. virsh prompts for user and password and then login me to the shell.

But spicy fails. It prompts only for the password and fails after receiving it
leaving error message in syslog:

Oct 13 23:24:21 paladin spicy[9001]: GSSAPI client step 1

What are the supposed actions I should perform to get further debug
informations?