On Tue, Nov 27, 2012 at 02:01:48PM -0800, Iain Morgan wrote:
On Tue, Nov 27, 2012 at 15:00:42 -0600, Stephen Gallagher wrote:
> On Tue 27 Nov 2012 03:51:55 PM EST, Iain Morgan wrote:
> > Hello,
> > I recently began experimenting with sssd (1.8.0) and have run into an
> > issue with its support for password expiration. Specifically, the case
> > where sssd is configured to use LDAP and the user authenticates via SSH
> > public-key.
> > If a user connects via ssh to a host which is using sssd and
> > authenticates via a public-key, the only way to enforce password
> > expiration appears to be to set ldap_pwd_policy=shadow. However, sssd
> > will not attempt to change the password when the policy is thus set.
> > I know that there are those who would argue that password expiration
> > should not be enforced when public-key authentication is used, but that
> > is an organizational policy decision. The expectation for the environment
> > which I deal with is that password expiration should be enforced, and
> > work, regardless of the method used for authentication.
> > Is there some trick that I have overlooked or is this simply a design
> > limitation? If the shadow map were exposed, pam_unix.so could be used to
> > detect password expiration and pam_sss.so (with ldap_pwd_policy=none)
> > could be used to change the password, but that is not currently the
> > case.
> Try setting:
> access_provider = ldap
> ldap_access_order = expire
> ldap_account_expire_policy = shadow
> That should do what you're looking for. It tells the SSSD to honor
> shadow expiration/locking policy during the PAM_ACCT_MGMT phase. This
> phase will occur regardless of what authentication mechanism you use.
Hmm, I had overlooked ldap_account_expire_policy. Unfortunately, the
settings recommended above do not appear to have altered the situation.
I guess I need to spend some time looking at the debug output.
If I understand your question correctly you would like to see a password
change dialog (Old password: ... New password: ... Retype new password:
---) even when using ssh with public-key authentication? If this is the
case I would to ask you to fila an enhancement ticket to the sssd trac
instance at https://fedorahosted.org/sssd/
and describe your use-case.
Currently sssd returns the corresponding PAM error code
PAM_NEW_AUTHTOK_REQD only if an expired password was found during
password based authentication and the PAM_ACCT_MGMT phase is purely used
for access control. But as long as sssd can detect an expired password
during PAM_ACCT_MGMT it would be possible to return PAM_NEW_AUTHTOK_REQD
as well. Please note that this in not possible in all cases, e.g. if
Kerberos authentication is used you typically can only detect that a
password is expired by trying to authenticate with the correct password
and check the responses form the KDC.
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