[Freeipa-users] Error looking up public keys

[Sumit Bose]

On Thu, Oct 06, 2016 at 03:48:10PM +0100, Alessandro De Maria wrote:
> Hello,
> 
> We are moving some of our servers to use 16.04 and for all new installs I
> have noticed that I am unable to fetch the ssh_authorized keys from the
> server.
> 
> /usr/bin/sss_ssh_authorizedkeys --debug 10 -d prod.zzzzzzz.com ademaria
> (Thu Oct  6 11:29:59:823635 2016) [/usr/bin/sss_ssh_authorizedkeys] [main]
> (0x0020): sss_ssh_get_ent() failed (14): Bad address
> Error looking up public keys
> 
> This only happens on Ubuntu 16.04. We have a number of 12.04 that work
> perfectly.
> 
> The configuration seems ok or at least matches the one on 12.04.
> I increased the debug level on sssd and sss_ssh and this is the output I get

...

> (Thu Oct  6 15:42:01 2016) [sssd[ssh]] [cert_to_ssh_key] (0x0040):
> NSS_InitContext failed [-8015].
> (Thu Oct  6 15:42:01 2016) [sssd[ssh]] [decode_and_add_base64_data]
> (0x0040): cert_to_ssh_key failed.
> (Thu Oct  6 15:42:01 2016) [sssd[ssh]] [ssh_cmd_build_reply] (0x0040):
> decode_and_add_base64_data failed.
> (Thu Oct  6 15:42:01 2016) [sssd[ssh]] [ssh_cmd_done] (0x0020): Fatal
> error, killing connection!

...

Newer version of SSSD can derive ssh-keys from valid X.509 certificates
stored in the LDAP entry of the user. Unfortunately it looks like in
your build of SSSD needs a fix for
https://fedorahosted.org/sssd/ticket/2977. Please open a ticket for your
distribution to include the patch for this issue which is linked at the
end of the ticket.

As a workaround you can set 'ldap_user_certificate = noSuchAttribute' in
the [domain/...] section of sssd.conf. This should prevent SSSD from
reading the certificate stored in the user entry. After changing
sssd.conf you should invalidate the cache by calling 'sss_cache -E' and
restart SSSD.

HTH

bye,
Sumit

> 
> Could you help me understand what is the issue with it?
> 
> Regards
> Alessandro
> 
> -- 
> Alessandro De Maria
> alessandro.demaria at gmail.com

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