Difference between revisions of "Smtp auth"

Revision as of 23:28, 21 April 2008

When I upgrade to Hardy Heron, it looks like I'll have an easier time getting mail to work.

Here is an Ubuntu-specific recipe that looks like it will do the job:

https://help.ubuntu.com/7.04/server/C/postfix.html

Currently, my mail service is working as long as I don't try to send mail from a remote machine. For instance, if I have a laptop configured to send mail outgoing mail to my server and am connecting through an untrusted network in a coffee shop or a friend's house, I am unable to connect to the server. This must be fixed.

There are several differences between my existing /etc/postfix/main.cf config and the recipe linked above:

However, my server currently generates the correct list of available services when starting a transaction:

root@weasel:/etc/default# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 weasel.finninday.net ESMTP Postfix (Ubuntu)
ehlo weasel.finninday.net
250-weasel.finninday.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN DIGEST-MD5 CRAM-MD5
250 8BITMIME
quit

It even offers the correct services to remote machines:

[rday@snapper ~]$ telnet finninday.net 25
Trying 24.21.185.50...
Connected to finninday.net.
Escape character is '^]'.
220 weasel.finninday.net ESMTP Postfix (Ubuntu)
ehlo weasel.finninday.net
250-weasel.finninday.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN DIGEST-MD5 CRAM-MD5
250 8BITMIME
quit

I found another recipe that said it was actually tested on Dapper Drake and correctly identified the sasl2 package that I stumbled over before.

https://help.ubuntu.com/community/Postfix

So I followed that recipe and made these changes to my main.cf:

root@weasel:/etc/postfix# diff main.cf.orig main.cf
40,41c40,41
< #smtpd_sasl_auth_enable = yes
< smtpd_sasl2_auth_enable = yes
---
> smtpd_sasl_auth_enable = yes
> #smtpd_sasl2_auth_enable = yes
55c55
< smtpd_sasl_local_domain = $mydomain
---
> smtpd_sasl_local_domain = 
59a60,61
> smtp_use_tls = yes
> smtp_tls_note_starttls_offer = yes

And restarted postfix.

When I try to send an email, I get this in the logs:

Apr 21 15:52:15 localhost postfix/smtpd[26421]: connect from PSMFC-fwgt.psmfc.org[205.230.28.193]
Apr 21 15:52:15 localhost postfix/smtpd[26421]: setting up TLS connection from PSMFC-fwgt.psmfc.org[205.230.28.193]
Apr 21 15:52:15 localhost postfix/smtpd[26421]: TLS connection established from PSMFC-fwgt.psmfc.org[205.230.28.193]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: SASL authentication failure: no secret in database
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: PSMFC-fwgt.psmfc.org[205.230.28.193]: SASL CRAM-MD5 authentication failed
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: SASL authentication failure: Password verification failed
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: PSMFC-fwgt.psmfc.org[205.230.28.193]: SASL PLAIN authentication failed
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
Apr 21 15:52:23 localhost postfix/smtpd[26421]: warning: PSMFC-fwgt.psmfc.org[205.230.28.193]: SASL LOGIN authentication failed
Apr 21 15:52:46 localhost postfix/smtpd[26421]: disconnect from PSMFC-fwgt.psmfc.org[205.230.28.193]

Made a few other changes to /etc/default/saslauthd:

root@weasel:/etc/default# diff saslauthd.orig saslauthd
3a4,7
> PWDIR="/var/spool/postfix/var/run/saslauthd"
> PARAMS="-m ${PWDIR}"
> PIDFILE="${PWDIR}/saslauthd.pid"
> 
10,11c14,15
< #PARAMS="-m /var/spool/postfix/var/run/saslauthd -r"
< PARAMS="-m /var/run/saslauthd"
---
> 
> OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd"

That got things working and I could suddenly see that my certificate is expired. But I found that attempts to send TLS to my upstream provider, comcast were failing, so I took out the smtp_enable_tls.

This is the config that I've wanted. Now I can configure our Thunderbird on the laptop to be able to send mail wherever it is on the net:

outgoing server: weasel.finninday.net

port: 25

secure connection: TLS

Use username and password.

Going further, I took out md5 from the ciphers listed in /etc/postfix/sasl/smtpd.conf and commented out

#allow_plaintext:true

Another postfix reload.

Looks good. Now the logs are pretty clean:

Apr 21 16:22:02 localhost postfix/smtpd[28590]: connect from PSMFC-fwgt.psmfc.org[205.230.28.193]
Apr 21 16:22:02 localhost postfix/smtpd[28590]: setting up TLS connection from PSMFC-fwgt.psmfc.org[205.230.28.193]
Apr 21 16:22:04 localhost postfix/smtpd[28590]: TLS connection established from PSMFC-fwgt.psmfc.org[205.230.28.193]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Apr 21 16:22:05 localhost postfix/smtpd[28590]: 18DBC1334439: client=PSMFC-fwgt.psmfc.org[205.230.28.193], sasl_method=PLAIN, sasl_username=xxxx
Apr 21 16:22:05 localhost postfix/cleanup[28597]: 18DBC1334439: message-id=<480D2198.6020507@finninday.net>
Apr 21 16:22:05 localhost postfix/qmgr[28565]: 18DBC1334439: from=<xxxx@finninday.net>, size=649, nrcpt=1 (queue active)
Apr 21 16:22:05 localhost postfix/smtpd[28590]: disconnect from PSMFC-fwgt.psmfc.org[205.230.28.193]
Apr 21 16:22:19 localhost postfix/smtpd[28607]: connect from localhost.localdomain[127.0.0.1]
Apr 21 16:22:19 localhost postfix/smtpd[28607]: 9676713348D9: client=localhost.localdomain[127.0.0.1]
Apr 21 16:22:19 localhost postfix/cleanup[28597]: 9676713348D9: message-id=<480D2198.6020507@finninday.net>
Apr 21 16:22:19 localhost postfix/qmgr[28565]: 9676713348D9: from=<xxxx@finninday.net>, size=1112, nrcpt=1 (queue active)
Apr 21 16:22:19 localhost postfix/smtpd[28607]: disconnect from localhost.localdomain[127.0.0.1]
Apr 21 16:22:19 localhost amavis[19645]: (19645-06) Passed CLEAN, [205.230.28.193] [205.230.28.193] <xxxx@finninday.net> -> <xxxx@psmfc.org>, Message-ID: <480D2198.6020507@finninday.net>, mail_id: o1siW-0+w6ed, Hits: -3.343, 14426 ms
Apr 21 16:22:19 localhost postfix/smtp[28598]: 18DBC1334439: to=<xxxx@psmfc.org>, relay=127.0.0.1[127.0.0.1], delay=15, status=sent (250 2.6.0 Ok, id=19645-06, from MTA([127.0.0.1]:10025): 250 Ok: queued as 9676713348D9)
Apr 21 16:22:19 localhost postfix/qmgr[28565]: 18DBC1334439: removed
Apr 21 16:22:20 localhost postfix/smtp[28608]: Host offered STARTTLS: [smtp.g.comcast.net]
Apr 21 16:22:20 localhost postfix/smtp[28608]: 9676713348D9: to=<xxxx@psmfc.org>, relay=smtp.g.comcast.net[76.96.30.117], delay=1, status=sent (250 2.0.0 GPNK1Z00P15fmCg8U00000 mail accepted for delivery)
Apr 21 16:22:20 localhost postfix/qmgr[28565]: 9676713348D9: removed