Thanks for the suggestion, Markus.

I've tried it now without doing commented out the ssl_version in the configuration, and it makes no difference. As I can connect to the Galera Listener on MaxScale via TLSv1.2 from a mysql client on another machine, thus proving that it does have TLSv1.2 support, it seems like it's a bug. I'll report it.

Thanks again. 

On 4 Oct 2017 7:56 p.m., "Markus Mäkelä" <markus.makela@mariadb.com> wrote:

Hi,

I think we've seen something similar happen when the explicit SSL version is defined. I'd recommend removing the ssl_version parameter and trying again. By default MaxScale uses the highest supported SSL version so it should still default to TLSv1.2.

I see no reason why defining an explicit SSL version shouldn't work and if removing the ssl_version fixes the problem, I think there might be something wrong with how MaxScale chooses the SSL version. In this case, I would recommend that you open a bug report on the MariaDB jira: https://jira.mariadb.org/browse/MXS

Markus


On 04/10/17 19:47, Pak Chan wrote:
Hi,

I'm in the process of setting up MaxScale on Ubuntu 16.04 fronting a Galera cluster where the MariaDB database nodes (also on Ubuntu 16.04) are set to use TLSv1.2. There is a "test" user and a "galeramon" user on the database, both requiring SSL.

According to the documentation, I can configure this in MaxScale as follows:

[dbnode1]
type=server
address=172.16.1.22
port=3306
protocol=MySQLBackend
ssl=required
ssl_version=TLSv12
ssl_cert=/etc/mysql/ssl/db-client-cert.pem
ssl_key=/etc/mysql/ssl/db-client-key.pem
ssl_ca_cert=/etc/mysql/ssl/ca-cert.pem

[dbnode2]
type=server
address=172.16.1.23
port=3306
protocol=MySQLBackend
ssl=required
ssl_version=TLSv12
ssl_cert=/etc/mysql/ssl/db-client-cert.pem
ssl_key=/etc/mysql/ssl/db-client-key.pem
ssl_ca_cert=/etc/mysql/ssl/ca-cert.pem

[Galera Monitor]
type=monitor
module=galeramon
servers=dbnode1,dbnode2
user=galeramon
passwd=galeramon
monitor_interval=1000

[Galera Service]
type=service
router=readwritesplit
servers=dbnode1,dbnode2
user=galeramon
passwd=galeramon

[MaxAdmin Service]
type=service
router=cli

[Galera Listener]
type=listener
service=Galera Service
protocol=MySQLClient
port=3306
authenticator=MySQL
ssl=required
ssl_version=TLSv12
ssl_cert=/etc/mysql/ssl/server-cert.pem
ssl_key=/etc/mysql/ssl/server-key.pem
ssl_ca_cert=/etc/mysql/ssl/ca-cert.pem
ssl_cert_verify_depth=9
 
[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
socket=default

However, this never successfully connects. I ran a packet capture on the connection, and found that the reason it was failing was that MaxScale was trying to connect using TLSv1.0 despite the specification. Changing the "ssl_version" setting to "MAX" had no effect.

The version of openssl and libssl1.0.0 on the server are both 1.0.2g-1ubuntu4.8, so it should support TLSv1.2. I installed MaxScale with:

curl -sS https://downloads.mariadb.com/MariaDB/mariadb_repo_setup | sudo bash -s -- --mariadb-server-version=mariadb-10.1
sudo apt install maxscale

I can disable the TLS requirement for the "galeramon" user, which allows MaxScale to start up, but the moment I log into the database via MaxScale as the "test" user, the connection fails, as the following transcript (from a different server) shows:

test@dbclient01:~$ mysql -h 172.16.2.1 -u test -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 31200
Server version: 10.0.0 2.1.9-maxscale

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MySQL [(none)]> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    31200
Current database: *** NONE ***

ERROR 2003 (HY000): Authentication with backend failed. Session will be closed.
MySQL [(none)]>

Is this a known issue, or is there something wrong with the configuration? For the record, I can connect to a database instance over TLSv1.2 from the MaxScale server using the mysql client with the same ("db-client-*") certificate as specified above.

PC


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-- 
Markus Mäkelä, Software Engineer
MariaDB Corporation
t: +358 40 7740484 | Skype: markus.j.makela

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