Fwd: mysql connection through ssl tunnel

[John Almberg]

>>
>> After a few hours of work today, I have all this working  
>> perfectly. I'm
>> using autossh to automatically create and monitor the ssh tunnel,  
>> and I
>> can make mysql connections through the tunnel with no problems.  
>> Very cool.
>>
>> And that's through PF firewalls on both machines, which added  
>> flavor to
>> the exercise ;-)
>>
>> One question... and maybe this is a general, philosophical  
>> question...
>>
>> If autossh watches over my ssh tunnel, who or what watches over  
>> autossh?
>>
>> As a related question, how can I make autossh start automatically  
>> after
>> a reboot? At the moment, I start autossh from the command line,  
>> like so:
>>
>>> autossh -M 20000 -fNg -L 33006:127.0.0.1:3306 admin at dbs.example.com
>>
>> There doesn't seem to be an rc.d file for autossh... Do I have to  
>> figure
>> out how to make one?
>>
>
> You can do this all by not using autossh at all: let init watch and
> re-establish your ssh tunnel:
>
> This is in my /etc/ttys (wrapped for readability):
>
> ttyv8   "/usr/bin/ssh -l syslogng -nNTx -R 3306:local.domain.tld:3306
> remote.domain.tld >/dev/null 2>&1"    unknown on
>
> I let my central machine control the tunnel, not the sending one.

H'mmm... This is new territory for me. I've just read some of the man  
pages and a few pages in Absolute BSD, and I guess I sort of  
understand what this does. I'm trying to grasp the connection between  
virtual terminals and this SSH tunnel...

I guess my main question is, if I start the tunnel with this method,  
will I be able to access mysql in 'the usual way'? The following  
works with my autossh tunnel:

mysql -h127.0.0.1 -P33006 -uuser -ppassword db

So, if using the /etc/ttys file is equivalent, and I make the  
connection on the database server, rather than the client server,  
then I guess my ttys file should look like this (my ttyv8 is already  
used... I am guessing I should use the next one down):

ttyv7   "/usr/bin/ssh -l admin -nNTx -R 3306:127.0.0.1:33006  
example.com >/dev/null 2>&1"    unknown on

Where 'admin' is the user I am logging into on the remote machine,  
and 'example.com' is the hostname of the remote machine. I guess  
equivalent to the following?

ttyv7   "/usr/bin/ssh -nNTx -R 3306:127.0.0.1:33006 admin at example.com  
 >/dev/null 2>&1"    unknown on

Port 33006 is not a typo. There are databases running on both  
machines, so I need to use a different port for the tunnel.

And as far as I can tell, I reload /etc/ttys with 'kill -1 1'.

This looks dangerous...

-- John


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