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add 2048 bits of DH params for nginx, postfix, dovecot

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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
This commit is contained in:
Joshua Tauberer
2014-09-26 22:01:38 +00:00
parent c2eb8e5330
commit 39bca053ed
5 changed files with 17 additions and 4 deletions
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2
setup/mail-postfix.sh
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@@ -69,11 +69,13 @@ cp conf/postfix_outgoing_mail_header_filters /etc/postfix/outgoing_mail_header_f
# Enable TLS on these and all other connections (i.e. ports 25 *and* 587) and
# require TLS before a user is allowed to authenticate. This also makes
# opportunistic TLS available on *incoming* mail.
# Set stronger DH parameters, which via openssl tend to default to 1024 bits.
tools/editconf.py /etc/postfix/main.cf \
smtpd_tls_security_level=may\
smtpd_tls_auth_only=yes \
smtpd_tls_cert_file=$STORAGE_ROOT/ssl/ssl_certificate.pem \
smtpd_tls_key_file=$STORAGE_ROOT/ssl/ssl_private_key.pem \
smtpd_tls_dh1024_param_file=$STORAGE_ROOT/ssl/dh2048.pem \
smtpd_tls_received_header=yes
# Prevent non-authenticated users from sending mail that requires being