Looking for NTLM config example

[Mark Foley]

Now that I am running Thunderbird on Linux and away from Windows/Outlook, I'd like to take
another run at setting up NTLM authentication from Thunderbird to my Samba4 AC/DC. 

With the help of the samba maillist folks I was able to set up NTLM authentication for domain
user login.  I should be able to do the same for email!

But, I need help. I went to http://wiki2.dovecot.org/Authentication/Mechanisms/NTLM and got
lost immediately. Are "authenticaion submethods" synonymous with "password schemes"? The 7th
line down says, "NTLM password scheme is required for NTLM, NTLM2 and NTLMv2.", but in the
referenced link I found no reference to "NTLM password scheme".

The links http://wiki2.dovecot.org/Authentication/Mechanisms/NTLM and
http://wiki2.dovecot.org/Authentication/PasswordSchemes, tell you what the 4 NTLM
authentication submethods are, tells you what password schemes are, tells you what the NTLM
client/server handshake is, but doesn't actually tell you how to configure dovecot config
files.  I'm much more interested in the "how to" than in: "NTLMv2: server and client nonce,
MITM can't force downgrade" ...  whatever that means. 

Anyway, probably it's my lack of understanding terminology.  I don't even know what a "nonce"
is.  But, I learn well from examples! Can somone please give me a sample 10-auth.conf for NTML
and any other supporting settings or configs I need?

My current/working dovecot settings, which have been running perfectly for well over a year
now, are:

$ dovecot -n
# 2.2.15: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.10.17 x86_64 Slackware 14.1
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
info_log_path = /var/log/dovecot_info
mail_location = maildir:~/Maildir
passdb {
  driver = shadow
}
protocols = imap
ssl_cert = </etc/ssl/certs/OHPRS/GoDaddy/Apache/2015-08-14/57aa6ed6ae98b4c7.crt
ssl_key = </etc/ssl/certs/OHPRS/GoDaddy/my.server.name.key
userdb {
  driver = passwd
}
verbose_ssl = yes


Here's what I've tried so far as 10-auth.conf:

disable_plaintext_auth = no
auth_use_winbind = yes
info_log_path = /var/log/dovecot_info
auth_verbose = yes
auth_debug_passwords = yes
auth_verbose_passwords= plain
auth_winbind_helper_path = /usr/bin/ntlm_auth

auth_mechanisms = ntlm plain login

userdb {
  driver = passwd
  args = username_format=%n allow_all_users=yes

}


Which gives me a dovecot -n of:

$ dovecot -n
# 2.2.15: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.10.17 x86_64 Slackware 14.1
auth_debug_passwords = yes
auth_mechanisms = ntlm plain login
auth_use_winbind = yes
auth_verbose = yes
auth_verbose_passwords = plain
disable_plaintext_auth = no
info_log_path = /var/log/dovecot_info
mail_location = maildir:~/Maildir
protocols = imap
ssl_cert = </etc/ssl/certs/OHPRS/GoDaddy/Apache/2015-08-14/57aa6ed6ae98b4c7.crt
ssl_key = </etc/ssl/certs/OHPRS/GoDaddy/my.server.name.key
userdb {
  args = username_format=%n allow_all_users=yes
  driver = passwd
}
verbose_ssl = yes


I configured Thunderbird for NTLM authentication, then tried sending a message, I got the
following in /var/log/dovecot_info:

Apr 22 01:37:57 imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges
Apr 22 01:37:57 imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges
Apr 22 01:37:57 auth: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth
Apr 22 01:37:57 imap-login: Info: Disconnected: Auth process broken (disconnected before auth was ready, waited 0 secs): user=<>, rip=192.168.0.58, lip=98.102.63.107, session=<xFuyOgwx9wDAqAA6>


On Thunderbird I got the error, "Sending of the message failed.  The Outlgoing server (SMTP)
my.server.name does not support the selected authentication method.  Please change the
'Autnentication method' in 'Account Settings | Outgoing Server (SMTP)'."

Clearly, something is configured wrong, but I've no clue what.

Can I get some advice?

THX --Mark