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<H1>[Mageia-sysadm] ldap server certificate (was: Re: [Mageia-discuss] Fosdem report)</H1>
<B>Buchan Milne</B>
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TITLE="[Mageia-sysadm] ldap server certificate (was: Re: [Mageia-discuss] Fosdem report)">bgmilne at zarb.org
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<I>Wed Feb 15 08:25:22 CET 2012</I>
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<PRE>On Tuesday, 14 February 2012 17:36:14 nicolas vigier wrote:
><i> On Tue, 14 Feb 2012, Oliver Burger wrote:
</I>><i> > But shall we write that command line into the wiki? Aside from not
</I>><i> > working: [<A HREF="https://www.mageia.org/mailman/listinfo/mageia-sysadm">oli at beteigeuze</A> avfs]$ ldapsearch -W -Z -h ldap.mageia.org -D
</I>><i> > uid=obgr_seneca,ou=People,dc=mageia,dc=org -b ou=Group,dc=mageia,dc=org
</I>><i> > ldap_start_tls: Connect error (-11)
</I>><i> > Enter LDAP Password:
</I>><i> > ldap_result: Can't contact LDAP server (-1)
</I>><i>
</I>><i> It looks like we are still using a self-signed certificate on the ldap
</I>><i> server.
</I>
Yes.
><i> So it's required to have "TLS_REQCERT allow" in
</I>><i> /etc/openldap/ldap.conf to be able to connect to the ldap server.
</I>
There are a few issues. If the self-signed cert and key were separate files
(new installs of openldap-server will do it this way as of current cauldron),
then the self-signed cert would not be too much of an issue if the self-signed
cert were distributed to all nodes and set as the TLS_CACERT, e.g.:
# grep ^TLS_CACERT /etc/openldap/ldap.conf
TLS_CACERT /etc/ssl/openldap/ldap.mageia.org.pem
The next issue is:
# openssl x509 -noout -subject -in /etc/ssl/openldap/ldap.mageia.org.pem
subject= /C=FR/ST=France/L=Marseille/O=Mageia/OU=Ldap
server/CN=valstar.mageia.org/emailAddress=<A HREF="https://www.mageia.org/mailman/listinfo/mageia-sysadm">root at mageia.org</A>
subjectCN does not match the hostname that was provided, and no Subject
Alternative Names provided, so:
# ldapsearch -LLL -x -h ldap.mageia.org -ZZ -s base -b ''
namingContextsldap_start_tls: Connect error (-11)
additional info: TLS: hostname does not match CN in peer certificate
vs
# ldapsearch -LLL -x -h valstar.mageia.org -ZZ -s base -b '' namingContexts
dn:
namingContexts: dc=mageia,dc=org
namingContexts: dc=test_ldap
But, this doesn't scale. We already have 2 LDAP servers, we would now need to
have both of their certs in the TLS_CACERT, and update it if:
-a cert is updated for whatever reason
-we add more servers
><i> Should we also use the *.mageia.org certificate on the ldap server ?
</I>
No, as you are distributing the key too widely, opening up easy avenues for
decrypting the traffic.
><i> Or have our own CA
</I>
Yes.
><i> with keys distributed by rpm packages in the
</I>><i> distribution ?
</I>
No. Possibly the CA cert distributed, if we intend for distribution users to
access our LDAP directory from the internet (which seems is currently
possible). But, then I am not sure if that is intended, or a mistake.
Regards,
Buchan
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