strengthen the cyphers and protocols allowed by Dovecot and Postfix submission
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@ -34,15 +34,17 @@ tools/editconf.py /etc/postfix/main.cf \
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smtpd_banner="\$myhostname ESMTP Hi, I'm a Mail-in-a-Box (Ubuntu/Postfix; see https://github.com/joshdata/mailinabox)" \
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mydestination=localhost
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# Enable the 'submission' port 587 smtpd server, and give it a different
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# name in syslog to distinguish it from the port 25 smtpd server.
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#
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# Add a new cleanup service specific to the submission service ('authclean')
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# Enable the 'submission' port 587 smtpd server and tweak its settings.
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# a) Require the best ciphers for incoming connections per http://baldric.net/2013/12/07/tls-ciphers-in-postfix-and-dovecot/.
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# but without affecting opportunistic TLS on incoming mail, which will allow any cipher (it's better than none).
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# b) Give it a different name in syslog to distinguish it from the port 25 smtpd server.
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# c) Add a new cleanup service specific to the submission service ('authclean')
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# that filters out privacy-sensitive headers on mail being sent out by
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# authenticated users.
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tools/editconf.py /etc/postfix/master.cf -s -w \
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"submission=inet n - - - - smtpd
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-o syslog_name=postfix/submission
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-o smtpd_tls_ciphers=high -o smtpd_tls_protocols=!SSLv2,!SSLv3
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-o cleanup_service_name=authclean" \
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"authclean=unix n - - - 0 cleanup
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-o header_checks=pcre:/etc/postfix/outgoing_mail_header_filters"
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@ -237,11 +239,13 @@ tools/editconf.py /etc/dovecot/conf.d/15-lda.conf \
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# Drew Crawford sets the auth-worker process to run as the mail user, but we don't care if it runs as root.
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# Enable SSL and specify the location of the SSL certificate and private key files.
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# Enable SSL, specify the location of the SSL certificate and private key files,
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# and allow only good ciphers per http://baldric.net/2013/12/07/tls-ciphers-in-postfix-and-dovecot/.
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tools/editconf.py /etc/dovecot/conf.d/10-ssl.conf \
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ssl=required \
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"ssl_cert=<$STORAGE_ROOT/ssl/ssl_certificate.pem" \
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"ssl_key=<$STORAGE_ROOT/ssl/ssl_private_key.pem" \
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"ssl_cipher_list=TLSv1+HIGH !SSLv2 !RC4 !aNULL !eNULL !3DES @STRENGTH"
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# PERMISSIONS / RESTART SERVICES
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