Sebastian,
Do you have any examples of such a function and how/where it is used ?
-----Original Message-----
From: dovecot <dovecot-boun...@dovecot.org> on behalf of Sebastian
<sebast...@sebbe.eu>
Reply-To: Dovecot Mailing List <dovecot@dovecot.org>
Date: Thursday, July 15, 2021 at 01:19
To: 'Mailing List' <dovecot@dovecot.org>
Subject: [EXTERNAL] Sv: 2FA/MFA with IMAP & postfix/submission
Main problem is that not many clients do natively support multifactor.
Some clients, do popup a login dialog if the server rejects the password as
invalid, which can be used to create a "cheaty variant" of multifactor, but
some clients just popup an error dialog and tell the user to just correct
password in settings.
Some clients even go as long as requiring the user to delete the account
with wrong password and set up a new connection.
So no, it cannot be relied upon.
I have a better idea:
Have a function for whitelisting IPs, possible /24's or similiar, where a
login to roundcube or other webmail client (with 2FA) will add the IP onto a
whitelist for that account.
Or perhaps, just "set" the country of the account based on GeoIP.
When an account tries to login via IMAP or SMTP, you just check if IP
and/or GeoIP country is right, and reject the login as invalid if so not.
The only thing a client needs to do to get his IMAP or SMTP client to work
again if it stops working, is to login once via the web client.
-----Ursprungligt meddelande-----
Från: dovecot-boun...@dovecot.org <dovecot-boun...@dovecot.org> För Alex
Skickat: den 15 juli 2021 02:10
Till: dovecot@dovecot.org
Ämne: 2FA/MFA with IMAP & postfix/submission
Hi, I have a dovecot-2.3.13 system on fedora34 with a few hundred
IMAP4 accounts, as well as postfix users using submission. Clients are
using primarily Outlook on Windows and old squirrelmail.
Are there multi-factor options available?
If it is not available, do you have any recommendations on where I
should look to do this?
All of the links related to this topic appear to be very old, or
limited to Linux PAM users.
