[SSSD] pick up "EXTERNAL MECH" identity to log in

Dmitri Pal dpal at redhat.com
Wed Mar 28 15:05:48 UTC 2012


On 03/28/2012 09:59 AM, Olivier wrote:
> Hello there
>
> Not sure that this is feasable nor that this is the right place
> to submit this question but I think it is.
>
> I use sssd to deal with authentication on my linux boxes :
> OK
>
> I also know how to use external SASL_MECH to bind my
> ldap server : I have produced and install a certificate with
> an appropriate subject and signed it by a CA that is known
> by my ldap server. Like this, I can bind the server over TLS
> with my identity and without providing any passwd.
>
> $ ldapsearch -ZZ uid=olivier
> SASL/EXTERNAL authentication started
> SASL username:
> 0.9.2342.19200300.100.1.1=guillard,ou=staff,dc=example,dc=fr
> SASL SSF: 0
> ...response...
>
> Right : nothing new.
>
> I was now wondering if there would have any way to annonce
> my certificate using the "external SASL_MECH"  mechanism
> over a login process to a linux box (let say using ssh), so that
> pam would not ask me to type a "login" and a "password" to
> log in ?
>
> Don't hesitate to fire if my question is stupid.
>
> Thanks,
>
> ---
> Olivier
>
>
> PS, to rephrase that : I'm looking for a way to use a personnal key
> to login without having to provide a password. ssh keys are not
> the right solution because I would need to install the public key
> in every authorized_key on my network ( I would like a centralized
> solution ).
>
> I also found this :
> http://code.google.com/p/openssh-lpk/
>
> But I don't want to patch ssh if possible since I highly prefere to
> use standard tools provided as much as possible
>
> I'm on RedHat6
>
>

Are you sshing from Windows or Linux?
I am not sure how you can do it with just a key or a cert.
SSH does not support cert authentication but in RHEL there have been
some patches to support X509 certs though I am not sure how exactly it
would work.

If you use Kerberos and/or IPA for your Lunix/UNIX environment you can
provision a user keytab to the machine from which you ssh and
script around  ssh call to do kinit with the user key in the keytab.
Then you will not be asked for anything. kinit will acquire the ticket
using the principal you scripted. It would use the key that you
provisioned. And the SSH would use GSSAPI to log you into the box.

>
>
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-- 
Thank you,
Dmitri Pal

Sr. Engineering Manager IPA project,
Red Hat Inc.


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