[Fedora-directory-users] Unable to SSL with Windows Sync Agreement

Thu Aug 7 14:19:48 UTC 2008

Hi Sebastian,

Thanks for your reply.

We've created the CA and Server certificates on Red Hat Directory Server

(like described in:
http://www.redhat.com/docs/manuals/dir-server/ag/8.0/Managing_SSL-Using_
certutil.html
<http://www.redhat.com/docs/manuals/dir-server/ag/8.0/Managing_SSL-Using
_certutil.html>  )   

And created a server certificate on the Windows Server
(http://support.microsoft.com/kb/931351
<http://support.microsoft.com/kb/931351> )

The CA and Server certificates are exchanged between the both Servers
and are trusted, like the certutil output shows:

On the Red Hat Directory (rhds.grep):

# certutil -L -d .

                               Certificate Nickname

                               Trust Attributes

                               SSL,S/MIME,JAR/XPI

rhds_ds_ca_cert                CTu,u,u

parijs_server_cert             ,,

rhds_server_cert               u,u,u

parijs_ca_cert                 CT,,

on the Windows Active Directory (parijs.gem):

C:\Program Files\Red Hat Directory Password Synchronization>certutil -L
-d .

rhds_ds_ca_cert                                        CT,C,C

rhds_ds_server_cert                                    Pu,Pu,Pu

And the ldapsearch in the command line from the Red Hat server over SSL
works with the use of the certificate database, the following command
returns entries of Windows Active Directory:

/usr/lib64/mozldap/ldapsearch -Z -P /etc/dirsrv/slapd-rhds/cert8.db -h
adsync.parijs.gem -p 636 -D "CN=Administrator,CN=Users,DC=parijs,DC=gem"
-w - -s base -b "dc=parijs,dc=gem" "objectclass=top"

Note that I'm using a Red Hat Enterprise 64 bits version and a Windows
2003 32bits.

Do you've got any suggestions why there are no outgoing tcp/ip packages
from the Red hat Directory Server when the  new Windows Sync  Agreement
is configured and the message is shown that the Red Hat server is unable
to contact Active Directory server?

Mathijs.

From: fedora-directory-users-bounces at redhat.com
[mailto:fedora-directory-users-bounces at redhat.com] On Behalf Of
Sebastian Tabarce
Sent: donderdag 7 augustus 2008 15:03
To: General discussion list for the Fedora Directory server project.
Subject: Re: [Fedora-directory-users] Unable to SSL with Windows Sync
Agreement

Mathisj,

If I'm not mistaking, in order for the two servers to be able to talk
with each other, they need to have certificates signed by Certificate
Authorities recognized by the two servers (meaning, the certificates of
these root CAs must be installed on the two servers). Even more
straightforward is to generate certificate requests for both servers and
get them signed by the same root CA.

--- On Thu, 7/31/08, Groot, Mathijs de (IDT Competence Java)
<math.de.groot at logica.com> wrote:

From: Groot, Mathijs de (IDT Competence Java) <math.de.groot at logica.com>
Subject: [Fedora-directory-users] Unable to SSL with Windows Sync
Agreement
To: fedora-directory-users at redhat.com
Date: Thursday, July 31, 2008, 12:18 PM

Hello everyone,

I can use some help with setting up the Windows Sync.

Ill give some context first, im trying to sync user, groups and
passwords from a Windows 2003 server with Active Directory with a Red
Hat enterprise 5, Red Hat Directory Server 8.0.

It is a test environment with where I can access and configure the
servers easily.

But ive got some problems setting a new Windows Sync Agreement.

It comes down to the following:

I can't get an SSL connection  with the a new  Windows Sync Agreement,
from the Red Hat DS to the Windows AD server.

In the Windows Sync Server info screen I get the following message when
clicking on next:  

"unable to contact Active Directory server, continue"

(Windows Sync Server info screen located In the Directory Server Console
->  Configuration tab ->  Replication -> userRoot -> highlight the
database -> Object -> New Windows Sync Agreement -> The second screen
reads Windows Sync Server Info)

But when I uncheck the checkbox "Using encrypted SSL connection" the
connection works and the Windows AD server is reached.

So this concludes (and ive tested) that the Windows Server and domain is
reachable and the Bind DN is valid, and entered values are correct.

The SSL connection seems to be setup correctly, the checks (ldapsearch
query) described by the fedora manual outputs the correct result.
Following:

"

http://directory.fedoraproject.org/wiki/Howto:WindowsSync
<http://directory.fedoraproject.org/wiki/Howto:WindowsSync>  

Testing your Configuration

Test to make sure you can talk SSL from Fedora Directory to AD

This is how you test to verify that the Windows side SSL is enabled
properly:

ldapsearch -Z -P <RHDS-cert8.db> -h <AD/NT Hostname> -p <AD SSL port> -D
"<sync manager user>" -w < sync manager password> -s <scope> -b "<AD
base>" "<filter>"

"

My ldapsearch query:

/usr/lib64/mozldap/dapsearch -Z -P /etc/dirsrv/slapd-<instance>/cert8.db
-h compute.domain.com -p 636 -D
"CN=Administrator,CN=Users,DC=domain,DC=com"  -w <pwd> -s base -b
"dc=domain,dc=com" "objectclass=top"

But strangely enough there is not network traffic at all when the SSL
connection is checked!

(when clicking on next and the message "unable to contact Active
Directory server, continue" appears)

Ive done the following actions to make to monitor it:

First I've disabled SELinux, in case that blocks something (just for
testing).

watch the tcp ip traffic with:

tcpdump -nn -p port not ssh and ip host <Red Hat IP number>

Here I can see that, when I don't use the SSL connection, there is
traffic towards my Widows AD, but when ive check the SSL option, there
is no traffic at all, nothing.

As well when I look at the iptables:

added an extra line: iptables -I OUTPUT  1 -d <Windows AD IP number> -j
ACCEPT 

watch -d iptables -L -nv

I see the same result, traffic when I don't use the SSL option and no
traffic at all when the SSL option is checked.

How can I get the message "unable to contact Active Directory server,
continue" when there is no outgoing request from my Red Hat server.

Ive made certificates at both sides (Windows and Red Hat) and exported
and imported these certificated to the other server.

Please advice on following steps I can take, what the problem can be and
how it is possible that there is no traffic at all.

Thanks in advanced.

Matt

Mathijs A. de Groot
Consultant - Software Engineer
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