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Re: [libvirt] Some questions about virConnectAuthCallbackPtr

On 10/13/12 19:08, Richard W.M. Jones wrote:
On Sat, Oct 13, 2012 at 05:47:24PM +0100, Richard W.M. Jones wrote:
BTW I cannot get the libssh2 backend in libvirt to work.  For
every host it says:

   libvirt_auth.c: authentication required for libvirt URI 'qemu+libssh2://localhost/system'
   libvirt_auth.c: credential 'echoprompt'
   Accept SSH host key with hash '<correct host key>' for host 'localhost:22' (y/n)?: y
   libguestfs: error: could not connect to libvirt (code 85, domain 50): SSH transport error: SSH host key for 'localhost' (<correct host key>) was not accepted

No idea what I'm doing wrong.  Nothing in the logs on the server
indicate that anything is wrong on the remote side.


This is because of a bug in the libvirt code:

        if (!askKey.result ||
            STRCASENEQ(askKey.result, "y")) {
                           _("SSH host key for '%s' (%s) was not accepted"),
                           sess->hostname, keyhash);
            return -1;

The problem with this code is that it ignores the resultlen field.

If the caller passes result[] = { 'y' } (no trailing \0), resultlen = 1,
(which IMHO is a correct use of the API as described by the
documentation), then STRCASENEQ above will not match the string.

You need to use something like:

   askKey.resultlen >= 1 && askKey.result[0] == 'y'

or else some sort of memcmp function.


Hm, that seems to be a fair point. I'll have a look and try to fix this today.


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