Happy New Year all..
Still awaiting the merge of our variable capabilities patch.. once that is out, we can release the plugin for CLIENTID which can do all your 2FA for you as well..
Looking forward to a great 2020. Also be aware, the last two (2) months have seen a significant increase in brute force attacks against IMAP servers.. mostly using variations of older data breach passwords..
Make sure you have some form of 'weak password' detection in place.
Also, the sheer size of the botnets (IoT devices) means increased loads on your servers, so seriously consider country AUTH blocking, if your users don't need to log in from foreign countries, if you haven't already..
"MaxMind" makes that very easy, just be aware that they have changed some policies.. make sure you give them acreditation where due.
A lot of the attacks are against NON-TLS/SSL ports, but everyone should slowly move to simply blocking Port 110/143 AUTH attempts, if you really want to protect your users.
AUTH failure: 'michael@linuxmagic.com' CLIENTID enforced and missing CLIENTID or CLIENTID_TYPE rip=61.148.29.198 (CN) lip=192.168.0.204:143 (NON-TLS)
On 2020-01-07 12:43 a.m., lists wrote:
I block all my email ports except 25 from countries where I am not going to be sending or receiving email. I also block many datacenters, but blocking Digital Ocean, Vultur and AWS will get you 90%of the way there. You will need to use 587, that is no auth on 25. Again no blocking on 25, just block the other email ports.
I get maybe one attempt to log into my email account a week. Yeah not as good as 2FA but it isn't a research project either. Just a little firewall programming. I get the CIDRs from bgp.he.net.
I am assuming this is a personal server.
A bit extreme, but you could set up a VPN on a VPS and only allow that IP to send and receive email.
Original Message
From: lists@luigirosa.com Sent: January 7, 2020 12:29 AM To: dovecot@dovecot.org Subject: Re: 2FA for Dovecot
Kees de Jong wrote on 06/01/2020 12:58:
My goal is to protect my mail account with 2FA, which isn't a crazy idea in 2020. Therefore, I would like to know the possibilities of configuring 2FA for Dovecot.
Use an authentication backend that supports 2FA, such as oAuth:
https://wiki.dovecot.org/PasswordDatabase/oauth2
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