How to generate entries for different mechanisms with saslpasswd2

saslsendmail

I'm struggling to create the satisfactory set of records in sasldb2.db. If I use the regular

saslpasswd2 -c user

I get exactly one record, according to sasldblistusers2:

user@my.example.com:    userPassword

whereas this page leads me to believe, there ought to be a line for each mechanism (DIGEST-MD5, CRAM-MD5, and so on).

If I add -n to avoid storing the plain-text (I only really need the CRAM-MD5):

saslpasswd2 -n -c user

then sasldblistusers2 finds no records to list at all. My saslpasswd.conf consists of two lines:

mech_list:      cram-md5 digest-md5 ntlm plain
log_level:      9

I tried this on FreeBSD using cyrus-sasl-2.1.26_12 and Ubuntu with 2.1.25… What am I doing wrong?

I need CRAM-MD5 because, without further reconfiguring, my sendmail only lists that and DIGEST-MD5 as the acceptable AUTH-mechanisms. And the iPhones, apparently, do not support DIGEST-MD5. And I'm only doing all of this for the sake of a couple of iPhones — the normal computers already authenticate themselves with the client SSL-certificates issued by my own authority.

Ok, apparently, the CRAM-MD5 authentication has been succeeding all along — despite not being listed by sasldblistusers2. I created a new question — why does sendmail refuse relaying despite authentication's success.

Best Answer

I've managed to get it working with the following:

/etc/mail/sendmail.mc has the following set:

define(`confLOG_LEVEL', `13')dnl
define(`confAUTH_OPTIONS', `A')dnl
TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5')dnl
define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5')dnl

/etc/sasl2/Sendmail.conf contains the following:

pwcheck_method: auxprop
auxprop_plugin: sasldb
mech_list:      cram-md5 digest-md5
log_level:      9

Add a user to /etc/sasldb2 with:

# saslpasswd2 -c -u mail.example.com -a Sendmail test
<password>
<password>

Then test with:

# sendmail -O LogLevel=14 -bs -Am
220 server.example.com ESMTP Sendmail 8.14.7/8.14.7; Tue, 24 Oct 2017 09:24:44 +0100
ehlo localhost
250-server.example.com Hello root@localhost, pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5
250-DELIVERBY
250 HELP
AUTH CRAM-MD5
334 <challenge>
<generate response using test@mail.example.com, password and the above challenge text>
235 2.0.0 OK Authenticated

You can probably pare the settings down the absolute minimum but the above worked for me. This was on a RHEL 7 host.

Related Topic