Get a list of currently active IMAP connections?

[Antonio Leding]

At the risk of being pedestrian, I just use something like `sudo netstat 
-an | grep ‘:[ IMAP_PORT ]’`

I’m pretty sure you thought of this but still, thought I would toss it 
out…

Cheers

- - -

On 16 Aug 2022, at 13:15, Jaroslaw Rafa wrote:

> Hello Dovecot community,
>
> I have a question: is it possible to programmatically get from Dovecot 
> a
> list of currently active IMAP sessions (with IP addresses)? Via a 
> plugin or
> something?
>
> Or just check if there is an IMAP session currently open from a 
> particular IP
> address, with true/false type answer?
>
> I'm planning to implement a policy service for *Postfix* that will 
> revive
> the old "POP before SMTP" authorization concept (only it will be "IMAP
> before SMTP" this time). This policy service will reject connections 
> to
> mail submission ports (465, 587) - without even going to SMTP AUTH 
> phase -
> unless the connecting IP address has currently an IMAP session open to
> Dovecot, to mitigate SMTP AUTH attacks.
>
> But for this I need some way to check from within this policy service 
> if the
> particular IP address has a connection open or not. It could be of 
> course
> obtained by scanning Dovecot logs, but this involves quite a large 
> overhead.
> Therefore I'm looking for the way to get this information directly 
> from
> Dovecot's current state.
>
> Can you advise me of any way to do this?
>
> Or maybe someone has already written such a piece of software and it 
> is
> available somewhere on the Net?
> -- 
> Regards,
>    Jaroslaw Rafa
>    raj at rafa.eu.org
> --
> "In a million years, when kids go to school, they're gonna know: once 
> there
> was a Hushpuppy, and she lived with her daddy in the Bathtub."
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