OpenSSH, PAM and kerberos

Slawa Olhovchenkov slw at
Fri Aug 30 10:07:22 UTC 2013

On Fri, Aug 30, 2013 at 09:44:54AM +0200, Dag-Erling Sm??rgrav wrote:

> Slawa Olhovchenkov <slw at> writes:
> > I am try to setup single sign-on and found this is imposuble due to
> > bug in OpenSSH: currently sshd do pam_authenticate() and
> > pam_acct_mgmt() from child process, but pam_setcred() from paren
> > proccess. pam_krb5 in pam_sm_setcred() required information from
> > pam_sm_authenticate and can't work corretly (can't create
> > /tmp/krb5cc_NNNN, can't set envirompent KRB5CCNAME and so).
> PAM authentication in OpenSSH was broken for non-trivial cases when
> privilege separation was implemented.  Fixing it properly would be very
> difficult.

Same behaviour with 'UsePrivilegeSeparation no'.

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