random 3.0.22 issues with hostapd

Alan DeKok aland at deployingradius.com
Sun May 23 22:14:25 CEST 2021

On May 23, 2021, at 11:28 AM, Michael Ströder via Freeradius-Users <freeradius-users at lists.freeradius.org> wrote:
> But let's look at slapd log for a good case (stripped a bit of syslog
> output to keep lines shorter):
> ...
> As you can see the SASL/EXTERNAL bind for searching the user entry and
> the simple bind operation for checking user's password is done within a
> single pooled LDAP connection (conn=1735). This leads to this LDAP
> session being bound to the end user's entity. But this end user is not
> authorized to do the searches for users!
> Is that really how it is supposed to work?

  Nope.  That code hasn't changed in 3.0.22, so I'm not sure what's going on.

  Look for "rebound" in src/modules/rlm_ldap.  If it binds a connection as a particular user, then it sets "rebound=true".  And before using that connection again, it re-binds as the admin / read-only user.

> In my own implementations I always have persistent pooled connections
> for searching the LDAP directory, typically to map input username to the
> bind-DN, but strictly open new temporary LDAP connection for each simple
> bind operation checking a user's password. For better performance the
> latter can also be a second pooled anonymous connection exclusively used
> to send bind operations for user password validation and nothing else.

  It doesn't do exactly that, but pretty close.

> BTW: For such a situation OpenLDAP 2.5 now has a new overlay which
> implements the so-called Verify Credentials extended operation with
> which you can check the user's password including password policy checks
> done by slapd without re-binding. This would also save round-trips. But
> it will probably take some time before 2.5 gets widely available.


  Alan DeKok.

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