On Mon, Feb 10, 2020 at 01:44:52PM +0100, Winfried de Heiden via FreeIPA-users wrote:
Hi all,
sssd 2.20 is being used.
Hi,
with this version all validation should be done with the help of
p11_child. If you add debug_level=9 to the [ssh] section of sssd.conf
you should be able to see from the p11_child.log where the time is
spend.
bye,
Sumit
I cannot figure out why the network might cause problems since the "good
clients" are running on the same network, switches etc.
I dived into it anyway, finding a rather large and increasing number of
dropped packages and dive into that first. Nevertheless, this hardly cannot
be the cause since the issue only happens on the IPA-server itself...
Winfried
Sumit Bose via FreeIPA-users schreef op 10-02-2020 10:46:
> On Mon, Feb 10, 2020 at 09:54:04AM +0100, Winfried de Heiden via
> FreeIPA-users wrote:
> > Hi all,
> >
> > Yep, I do use user-certs for authentication and it seems ocsp takes
> > time;
> > but only on the IPA-server. Even on a Rapsberry Pi 3 as an
> > IPA-client, using
> > the same IPA-server, it is 4 times faster...
> >
> > Hence; something seems going wrong in oscp, but what could be
> > causing the
> > problem?
>
> Hi,
>
> which versions of SSSD are using one the client and the server? Older
> version of SSSD might use NSS and do the certificate validation in the
> ssh responder process, newer version might use OpenSSL and do the
> validation with the help of p11_child. Not sure if any of this might be
> a reason.
>
> Maybe you can take network trace of the communication with the OCSP
> responder to see if the delay happens on the network?
>
> bye,
> Sumit
>
> >
> > Winfried
> >
> > Op 09-02-2020 om 22:06 schreef Alexander Bokovoy:
> > > On su, 09 helmi 2020, Winfried de Heiden via FreeIPA-users wrote:
> > > > Hi all,
> > > > For some reason, for a particular user, sss_ssh_authorizedkeys is
> > > > extremely slow on the IPA-server:
> > > > time /usr/bin/sss_ssh_authorizedkeys <username>~real
0m9.520suser
> > > > 0m0.022ssys 0m0.018s
> > > > It will return all the public keys, but is is slow, causing
> > > > SSH-login delays using a ssh-keys.
> > > > On another CentOS Stream (8.1) IPA-client, using the same
IPA-server:
> > > > time /usr/bin/sss_ssh_authorizedkeys <username>~real
0m0.020suser
> > > > 0m0.005ssys 0m0.003s
> > > > Some difference...Adding "certificate_verification =
no_ocsp" to
> > > > sssd.conf on the IPA-server will bring back performance, but sound
> > > > like a poor workaround.
> > > > Any idea what is happening here?
> > >
> > > SSSD picks up certificates associated with the user entry for use as SSH
> > > keys as well. I guess verification of those certificates via OCSP takes
> > > time and that's why switching off the verification helps.
> > >
> > >
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