Commit Graph

15 Commits

Author SHA1 Message Date
Joshua Tauberer e39b777abc require TLS on SMTP submission (port 587) to prevent accidental client misconfiguration, although this has no other practical consequences since without TLS clients couldn't authenticate anyway 2015-05-06 00:25:03 +00:00
Joshua Tauberer 7ca42489ae drop legacy, export-grade, and anonymous ciphers from SMTP (port 25, opportunistic)
Even though SMTP (on port 25) is typically opportunistic and a MitM attack can't be prevented, we may as well only offer ciphers that provide some level of security. If a client is so old or misconfigured that it doesn't support newer ciphers, it should hopefully fall back to a non-TLS connection.

Postfix's default was basically anything goes (anonymous and 40-bit ciphers!). Google's MTA's only offer ciphers at 112 bits at greater, and this change approximates that with Postfix's "medium" setting.

Fixes #371
2015-05-05 23:50:07 +00:00
Joshua Tauberer 8c6363f792 bad ciphers were allowed in smtp submssion
This disallows aNULL and other bad ciphers in the Postfix submission server.

I missed an option in 45e93f7dcc recommended by the blog post I was reading.

Fixes #389.
2015-05-05 23:14:59 +00:00
Joshua Tauberer dcd971d079 the opendmarc miter should run on incoming mail only
I added OpenDMARC's milter in fba4d4702e. But this started
setting Authentication-Results headers on outbound mail with failures. Not sure why it
fails at that point, but it shouldn't be set at all. The failure might cause recipients
to junk the mail. See #358.

This commit removes the milter from the SMTP submission (port 587) listener.
2015-03-21 16:14:01 +00:00
Joshua Tauberer c4e4805160 ensure postfix/postgrey agree on whether to communicate with ipv4 or ipv6
see https://discourse.mailinabox.email/t/postgrey-and-ipv6/227
2015-01-02 23:37:16 +00:00
Joshua Tauberer 6585384daa bring the max outgoing mail size via webmail and z-push in line with the limit set in postfix: 128 MB
The limit was previously the nginx default (2MB?).

fixes #236
2014-10-16 22:11:10 +00:00
Joshua Tauberer 0b5bf602aa various improvements in bash comments 2014-10-15 11:46:20 -04:00
Joshua Tauberer 5fd107cae5 more work on making the bash scripts readable 2014-10-04 17:57:26 -04:00
Joshua Tauberer 39bca053ed add 2048 bits of DH params for nginx, postfix, dovecot
nginx/postfix use a new pre-generated dh2048.pem file. dovecot generates the bits on its own.

ssllabs.com reports that TLS_DHE ciphers went from 1024 to 2048 bits as expected. The ECDHE ciphers remain at 256 bits --- no idea what that really means. (This tests nginx only. I haven't tested postfix/dovecot.)

see https://discourse.mailinabox.email/t/fips-ready-for-ssl-dhec-key-exchange/76/3
2014-09-26 22:09:22 +00:00
Joshua Tauberer 9d40a12f44 first pass at making readable documentation by parsing the bash scripts 2014-09-21 13:43:31 -04:00
Joshua Tauberer e1606df237 s/joshdata/mailinabox/ due to repo moving to the org account 2014-08-16 13:16:01 +00:00
Joshua Tauberer 64cb00b9d6 add reject_unlisted_recipient before greylisting, fixes #127 2014-08-03 00:06:54 +00:00
Joshua Tauberer b86656243f avoid mail.log warnings about untrusted certificates on outgoing mail, fixes #124 2014-08-02 15:39:47 +00:00
Joshua Tauberer 023cd12e1a hide lots of unnecessary and scary output during setup 2014-07-16 09:36:56 -04:00
Joshua Tauberer e713af5f5a refactor the mail setup scripts
As the scripts keep growing, it's time to split them up to
keep them understandable.

This splits mail.sh into mail-postfix.sh, mail-dovecot.sh,
and mail-users.sh, which has all of the user database-related
configurations shared by Dovecot and Postfix. Also from
spamassassin.sh the core sieve configuration is moved into
mail-dovecot.sh and the virtual transport setting is moved
into mail-postfix.sh.

Also revising one of the sed scripts in mail-dovecot to
not insert a new additional # at the start of a line each
time the script is run.
2014-07-10 12:49:28 +00:00