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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

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This commit is contained in:
Joshua Tauberer 2015-05-06 00:25:03 +00:00
parent 7ca42489ae
commit e39b777abc
1 changed files with 3 additions and 0 deletions
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3
setup/mail-postfix.sh
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@ -65,6 +65,8 @@ tools/editconf.py /etc/postfix/main.cf \
# * Do not add the OpenDMAC Authentication-Results header. That should only be added
# on incoming mail. Omit the OpenDMARC milter by re-setting smtpd_milters to the
# OpenDKIM milter only. See dkim.sh.
# * Even though we dont allow auth over non-TLS connections (smtpd_tls_auth_only below, and without auth the client cant
# send outbound mail), don't allow non-TLS mail submission on this port anyway to prevent accidental misconfiguration.
# * Require the best ciphers for incoming connections per http://baldric.net/2013/12/07/tls-ciphers-in-postfix-and-dovecot/.
# By putting this setting here we leave opportunistic TLS on incoming mail at default cipher settings (any cipher is better than none).
# * Give it a different name in syslog to distinguish it from the port 25 smtpd server.
@ -75,6 +77,7 @@ tools/editconf.py /etc/postfix/master.cf -s -w \
"submission=inet n - - - - smtpd
-o syslog_name=postfix/submission
-o smtpd_milters=inet:127.0.0.1:8891
-o smtpd_tls_security_level=encrypt
-o smtpd_tls_ciphers=high -o smtpd_tls_exclude_ciphers=aNULL,DES,3DES,MD5,DES+MD5,RC4 -o smtpd_tls_protocols=!SSLv2,!SSLv3
-o cleanup_service_name=authclean" \
"authclean=unix n - - - 0 cleanup