[Freeipa-users] Ghost ipaSshPubKey in sss_ssh_authorizedkeys or 'Error looking up public keys'

[Sumit Bose]

On Sun, Jul 17, 2016 at 11:21:34PM +0200, Martin Štefany wrote:
> On So, 2016-07-16 at 15:37 +0200, Lukas Slebodnik wrote:
> > On (16/07/16 10:19), Martin Štefany wrote:
> > > 
> > > Hello Sumit,
> > > 
> > > seems that upgrade to F24 broke things again. This time no AVCs, empty SSSD
> > > logs, but same problem: 'Error looking up public keys'.
> > > 
> > > selinux-policy-3.13.1-191.fc24.3.noarch
> > > selinux-policy-targeted-3.13.1-191.fc24.3.noarch
> > > sssd-1.13.4-3.fc24.x86_64
> > > 
> > Fedora 23 and fedora 24 has the same version of sssd
> > and almost the same version of openssh.
> > I have no idea what coudl broke it it there are not any AVCs.
> > 
> > > 
> > > Using debug_level 0x0250 ::
> > > 
> > For troubleshooting, it would be better to see all
> > debug messages. (debug_level = 0xfff0)
> 
> Hello Lukas,
> 
> thanks for replying on this, here are debug_level = 0xfff0 messages
> 

...

> (Sun Jul 17 23:17:34 2016) [sssd[ssh]] [cert_to_ssh_key] (0x0020):
> CERT_VerifyCertificateNow failed [-8179].
> (Sun Jul 17 23:17:34 2016) [sssd[ssh]] [decode_and_add_base64_data] (0x0040):
> cert_to_ssh_key failed.

-8179 translates to "Peer's certificate issuer is not recognized."
(http://www-archive.mozilla.org/projects/security/pki/nss/ref/ssl/sslerr.html).
This means the CA certificate which signed the certificate on the
Smartcard is missing in /etc/pki/nssdb which is used by default by SSSD.

Recent version of IPA put IPA CA certificates only in /etc/ipa/nssdb,
this might be the reason why you see this with F24.

To fix this please either add the needed CA certificates to
/etc/pki/nssdb with certutil or add 'ca_db = /etc/ipa/nssdb' to the
[ssh] section of sssd.conf if /etc/ipa/nssdb already has all needed CA
certificates to validate the Smartcard certificate. 

I'm working on a fix for SSSD to handle handle this change
automatically, but unfortunately it is not ready yet.

HTH

bye,
Sumit

> 
> > > 
> > > $ /usr/bin/sss_ssh_authorizedkeys martin
> > > Error looking up public keys
> > > 
> > And try to run strace with sss_ssh_authorizedkeys
> > 
> > LS
> 
> Martin