Friday, January 26, 2024

[389-users] Re: 389 DS 2.3.6 on RHEL 9 replication over TLS

"LDAP error: Can't contact LDAP server (connection error)" is kind of generic, but often relates to PKI trust misconfiguration when TLS is used, a common issue is the issuer / CA certificate(s) chain is not installed, or not trusted.
There should be a message in the access log, for example "Peer does not recognize and trust the CA that issued your certificate."

a typical scenario is when the default test /demo/self signed certs are left over and used between 2 LDAP instances for replication, we have an example in this article (subscription required)
  How To test LDAPS with RHDS instances on 2 systems and default test CA
this happens as there is no shared configuration between instances.

in the links Thierry B. posted, also see this chapter:

1.8. Adding the CA certificate used by Directory Server to the trust store of Red Hat Enterprise Linux

I usually run a "trust anchor some.file.ca.crt" command, and add the issuer(s) to the LDAP instance's NSS db.



On Fri, Jan 26, 2024 at 1:21 AM Thierry Bordaz <tbordaz@redhat.com> wrote:

You may follow the doc to configure TLS on your both suppliers [1] and check the trusted CA on both side [2]. On troubleshooting side you may look at [3]

[1] https://access.redhat.com/documentation/en-us/red_hat_directory_server/12/html/securing_red_hat_directory_server/assembly_enabling-tls-encrypted-connections-to-directory-server_securing-rhds#doc-wrapper
[2] https://access.redhat.com/documentation/en-us/red_hat_directory_server/12/html/securing_red_hat_directory_server/assembly_changing-the-ca-trust-flagssecuring-rhds#doc-wrapper
[3] https://access.redhat.com/documentation/en-us/red_hat_directory_server/12/html/configuring_and_managing_replication/assembly_troubleshooting-replication-related-problems_configuring-and-managing-replication


On 1/25/24 23:55, Ciara Gadsden wrote:
Idk how to do that lol

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From: Simon Pichugin <spichugi@redhat.com>
Sent: Thursday, January 25, 2024 5:44:57 PM
To: General discussion list for the 389 Directory server project. <389-users@lists.fedoraproject.org>
Cc: alexander_nazarenko@harvard.edu <alexander_nazarenko@harvard.edu>
Subject: [389-users] Re: 389 DS 2.3.6 on RHEL 9 replication over TLS
 
Hello Alex,
I think we need a bit more information here.

First of all, could you please run the "dsconf repl-agmt create" (LDAPS one) with "-v" flag? It will give a detailed verbose output.
Also, I recommend checking the server's error and access log for more information why it fails (additionally, you may enable at least 16384+8192 (Default + Replication debugging) in nsslapd-errorlog-level).

As for possible issues and actions, at first glance, I recommend checking that the TLS certificates used are correctly installed and trusted on both the supplier and consumer instances. It's important that the instances trust each other; even though ldapsearch (OpenLDAP client) on the supplier already trusts the consumer machine, it's not enough.

Sincerely,
Simon



On Thu, Jan 25, 2024 at 1:07 PM Nazarenko, Alexander <alexander_nazarenko@harvard.edu> wrote:

Hello colleagues,

 

Lately we started looking into 389 DS 2.3.6 on RHEL 9 platform.

 

We followed instructions Configuring and managing replication on Red Hat site to establish replication between two remote instances,

The instances where previously configured to support TLS channel on port 636 (Enabling TLS-encrypted connections to Directory Server) , and we made sure ldapsearch is working with LDAPS:// protocol with the certificate verification (TLS_REQCERT demand).

 

The following issue with the replication over TLS was observed:

 

After we ran the command below to configure secure replication:

dsconf -D "cn=Directory Manager"  -w *** ldaps://server.example.edu  repl-agmt create --suffix "dc=example,dc=com" --host "consumer.example.edu" --port 636 --conn-protocol=LDAPS --bind-dn "cn=replication manager,cn=config" --bind-passwd "***" --bind-method=SIMPLE --init consumer.example.edu-RO

 

the error occurred:

Error (-1) Problem connecting to replica - LDAP error: Can't contact LDAP server (connection error)

 

We double-checked that after we configure clear text replication with the command:

dsconf -D "cn=Directory Manager"  -w *** ldaps://server.example.edu  repl-agmt create --suffix "dc=example,dc=com" --host "consumer.example.edu" --port 389 --conn-protocol=LDAP --bind-dn "cn=replication manager,cn=config" --bind-passwd "***" --bind-method=SIMPLE --init 10.140.133.36-RO

 

no problem occurred, and the replication completed successfully.

 

My question is whether this means the replication over TLS required different config steps, and if yes – what they are?

 

Thank you,

- Alex

 

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