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Olaf,

On 2/27/18 4:33 PM, Olaf Kock wrote:
> On 27.02.2018 21:54, Mark A. Claassen wrote:
>> From what I have read, it seems that the AJP connector is not
>> secure, and is meant to be used in a protective environment.
>> There are lots of things that imply this, like no SSL settings
>> and such, but I cannot find it directly stated anywhere.  I am
>> pretty confident in my read of this, but it is, of course,
>> difficult to say that "all options have been explored and it is
>> not possible".
> 
> I would /not/ state that it's /not secure/. But I'm following your
> later argument: It's an "unencrypted connector", yes. In order to
> encrypt it, it needs to be run through an encrypted tunnel - and
> doing so is cumbersome, error prone and unrelated to the
> unencrypted nature of this connector.

We use stunnel in production to tunnel AJP from AWS-based web servers
and our back-end co-located app servers. We haven't had any problems
with that set up vis-a-vis connection failures or anything like that.
We haven't even had any issues with running out of file-handles for
stunnel.

So, yes, it's another component to configure and babysit, but I
wouldn't call it "cumbersome"... merely "more than you might expect"
when HTTPS through mod_proxy_http is an alternative.

> And yes, I rambled - couldn't resist. While I wouldn't object with
> your proposed change, I believe that the world wouldn't be notably
> better with it.

I disagree: I can imagine many administrators (or developers, who
often do make these decisions) overlooking the fact that AJP is a
plaintext protocol. It's definitely worth mentioning that fact, and
that it should only be used over trusted channels where anyone
observing the traffic is an acceptable risk.

- -chris
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