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Re: Client says Can't contact LDAP server, but it can!

John Oliver wrote:
On Mon, Jul 28, 2008 at 09:20:23AM +0200, Buchan Milne wrote:
Or, ensure that the "CA certificate" that the clients use contains the
certificates of the issuer of both of the server certificates, and that the
value of the subject CN on both certificates matches the name you use to
connect to the servers.

I've tried:

openssl req -newkey rsa:1024 -x509 -nodes -out server.pem -keyout
server.pem -days 3650

That should create a file with keys and certs all in one, right?  No
possible misunderstanding about which is where.

Have you tried actually reading the OpenLDAP documentation? It appears you haven't. Start here and read the whole chapter:

It's a really stupid idea to keep the key and cert in the same file. The point of public-key cryptography is that you generate two pieces, and allow one piece to be distributed publically while requiring the other piece to be kept private.

For the OU, I put the domain name.  I have also tried using the FQDN in
a few variations.

Irrelevant, the software will only look at the CN in the DN.

For the CN, I put the FQDN.

I pointed TLSCertificateFile, TLSCertificateKeyFile, and
TLSCACertificateFile at that file in slapd.conf, and restarted the LDAP

And it doesn't work.

What "it"?

On my test client, ldap.conf has:

base dc=mydomain,dc=com
url ldaps://unix-services2.mydomain.com:636
timelimit 120
bind_timelimit 120
idle_timelimit 3600
ssl yes
tls_cacertdir /etc/openldap/cacerts
tls_checkpeer no
pam_password md5

The above is not valid for an OpenLDAP ldap.conf. (See the ldap.conf(5) manpage for what's valid.) It appears to be a PADL nss_ldap config file, but it's still invalid for that purpose. Make sure you're actually looking at the correct config file...

If I change the "host" and "url" to the other LDAP server, it works

On the working server, in slapd.conf I have:

TLSCertificateFile /etc/ssl/ldap.pem
TLSCertificateKeyFile /etc/openldap/ssl/ldap.pem
TLSCACertificateFile /etc/ssl/ldap.pem

Those files were created with:

openssl req -new -x509 -nodes -out /etc/ssl/ldap.pem -keyout
/etc/openldap/ssl/ldap.pem -days 3650

I created a second set of keys with that line on the non-working server
in the same directories (/etc/ssl and /etc/openldap/ssl).  That didn't
work either.

On both servers, I can do:

openssl s_client -connect localhost:636 -showcerts

And get identical results (except for the FQDNs, of course, and the
jumble of characters in the certificate).

That tells you that the server was able to use the certs you specified, but it doesn't tell you if the client is correctly configured. (Which it obviously is not.)

On a client pointed to the non-working server:

[root@localhost ~]# ldapsearch -x
# extended LDIF
# LDAPv3
# base<>  with scope sub
# filter: (objectclass=*)
# requesting: ALL

# search result
search: 2
result: 32 No such object

# numResponses: 1

Supposedly, that means "it works", even though it doesn't.  I don't know
what to make of that.

What exactly do you think "ldapsearch -x" was *supposed* to do? It looks like it's working perfectly well, given that you haven't fully configured the client.

I just don't know where to go from here.  I've created certificates over
and over and over again.  Even if by accident, I'd have had to have done
it right at least once.  On the other server, I did it once, and it

It looks like there must be some other variable... a config file,
something, that has something else to do with this.

-- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/