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update ssl according to updated mozilla guidelines, add DHE finite-fields according to RFC 7919

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This commit is contained in:
KiekerJan 2025-03-29 15:54:47 +01:00
parent 3efd4257b5
commit e8b63c0bbc
6 changed files with 37 additions and 26 deletions

13
conf/dh4096.pem Normal file
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@ -0,0 +1,13 @@
-----BEGIN DH PARAMETERS-----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-----END DH PARAMETERS-----

4
conf/nginx-ssl.conf
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@ -1,8 +1,8 @@
# We track the Mozilla "intermediate" compatibility TLS recommendations.
# Note that these settings are repeated in the SMTP and IMAP configuration.
# ssl_protocols has moved to nginx.conf in bionic, check there for enabled protocols.
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
ssl_dhparam STORAGE_ROOT/ssl/dh2048.pem;
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305;
ssl_dhparam STORAGE_ROOT/ssl/dh4096.pem;
# as recommended by http://nginx.org/en/docs/http/configuring_https_servers.html
ssl_session_cache shared:SSL:50m;

10
setup/mail-dovecot.sh
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@ -104,17 +104,17 @@ tools/editconf.py /etc/dovecot/conf.d/10-auth.conf \
"auth_mechanisms=plain login"
# Enable SSL, specify the location of the SSL certificate and private key files.
# Use Mozilla's "Intermediate" recommendations at https://ssl-config.mozilla.org/#server=dovecot&server-version=2.2.33&config=intermediate&openssl-version=1.1.1,
# Use Mozilla's "Intermediate" recommendations at https://ssl-config.mozilla.org/#server=dovecot&version=2.3.16&config=intermediate&openssl=3.0.2&guideline=5.7,
# except that the current version of Dovecot does not have a TLSv1.3 setting, so we only use TLSv1.2.
tools/editconf.py /etc/dovecot/conf.d/10-ssl.conf \
ssl=required \
"ssl_cert=<$STORAGE_ROOT/ssl/ssl_certificate.pem" \
"ssl_key=<$STORAGE_ROOT/ssl/ssl_private_key.pem" \
"ssl_min_protocol=TLSv1.2" \
"ssl_cipher_list=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384" \
"ssl_prefer_server_ciphers=no" \
"ssl_dh_parameters_length=2048" \
"ssl_dh=<$STORAGE_ROOT/ssl/dh2048.pem"
"ssl_cipher_list=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305" \
"ssl_curve_list=X25519:prime256v1:secp384r1" \
"ssl_prefer_server_ciphers=yes" \
"ssl_dh=<$STORAGE_ROOT/ssl/dh4096.pem"
# Disable in-the-clear IMAP/POP because there is no reason for a user to transmit
# login credentials outside of an encrypted connection. Only the over-TLS versions

22
setup/mail-postfix.sh
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@ -128,31 +128,31 @@ sed -i "s/PUBLIC_IP/$PUBLIC_IP/" /etc/postfix/outgoing_mail_header_filters
# encryption. On ports 465 and 587 it is mandatory (see above). Shared and non-shared settings are
# given here. Shared settings include:
# * Require TLS before a user is allowed to authenticate.
# * Set the path to the server TLS certificate and 2048-bit DH parameters for old DH ciphers.
# * Set the path to the server TLS certificate and 4096-bit DH parameters for old DH ciphers.
# For port 25 only:
# * Disable extremely old versions of TLS and extremely unsafe ciphers, but some mail servers out in
# the world are very far behind and if we disable too much, they may not be able to use TLS and
# won't fall back to cleartext. So we don't disable too much. smtpd_tls_exclude_ciphers applies to
# both port 25 and port 587, but because we override the cipher list for both, it probably isn't used.
# Use Mozilla's "Old" recommendations at https://ssl-config.mozilla.org/#server=postfix&server-version=3.3.0&config=old&openssl-version=1.1.1
# Use Mozilla's "Old" recommendations at https://ssl-config.mozilla.org/#server=postfix&version=3.6.4&config=old&openssl=3.0.2&guideline=5.7
tools/editconf.py /etc/postfix/main.cf \
smtpd_tls_security_level=may\
smtpd_tls_auth_only=yes \
smtpd_tls_cert_file="$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_protocols="!SSLv2,!SSLv3" \
smtpd_tls_dh1024_param_file="$STORAGE_ROOT/ssl/dh4096.pem" \
smtpd_tls_protocols=">=TLSv1" \
smtpd_tls_ciphers=medium \
tls_medium_cipherlist=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA \
tls_medium_cipherlist="@SECLEVEL=0:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA" \
smtpd_tls_exclude_ciphers=aNULL,RC4 \
tls_preempt_cipherlist=no \
tls_preempt_cipherlist=yes \
smtpd_tls_received_header=yes
# For ports 465/587 (via the 'mandatory' settings):
# * Use Mozilla's "Intermediate" TLS recommendations from https://ssl-config.mozilla.org/#server=postfix&server-version=3.3.0&config=intermediate&openssl-version=1.1.1
# * Use Mozilla's "Intermediate" TLS recommendations from https://ssl-config.mozilla.org/#server=postfix&version=3.6.4&config=intermediate&openssl=3.0.2&guideline=5.7
# using and overriding the "high" cipher list so we don't conflict with the more permissive settings for port 25.
tools/editconf.py /etc/postfix/main.cf \
smtpd_tls_mandatory_protocols="!SSLv2,!SSLv3,!TLSv1,!TLSv1.1" \
smtpd_tls_mandatory_protocols=">=TLSv1.2" \
smtpd_tls_mandatory_ciphers=high \
tls_high_cipherlist=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384 \
smtpd_tls_mandatory_exclude_ciphers=aNULL,DES,3DES,MD5,DES+MD5,RC4
@ -177,7 +177,7 @@ tools/editconf.py /etc/postfix/main.cf \
# accept whatever SSL certificate the remote end provides. Opportunistic TLS
# protects against passive easvesdropping (but not man-in-the-middle attacks).
# Since we'd rather have poor encryption than none at all, we use Mozilla's
# "Old" recommendations at https://ssl-config.mozilla.org/#server=postfix&server-version=3.3.0&config=old&openssl-version=1.1.1
# "Old" recommendations at https://ssl-config.mozilla.org/#server=postfix&version=3.6.4&config=old&openssl=3.0.2&guideline=5.7
# for opportunistic encryption but "Intermediate" recommendations when DANE
# is used (see next and above). The cipher lists are set above.
@ -193,12 +193,12 @@ tools/editconf.py /etc/postfix/main.cf \
# even if we don't know if it's to the right party, than to not encrypt at all. Instead we'll
# now see notices about trusted certs. The CA file is provided by the package `ca-certificates`.
tools/editconf.py /etc/postfix/main.cf \
smtp_tls_protocols=\!SSLv2,\!SSLv3 \
smtp_tls_protocols=">=TLSv1" \
smtp_tls_ciphers=medium \
smtp_tls_exclude_ciphers=aNULL,RC4 \
smtp_tls_security_level=dane \
smtp_dns_support_level=dnssec \
smtp_tls_mandatory_protocols="!SSLv2,!SSLv3,!TLSv1,!TLSv1.1" \
smtp_tls_mandatory_protocols=">=TLSv1.2" \
smtp_tls_mandatory_ciphers=high \
smtp_tls_CAfile=/etc/ssl/certs/ca-certificates.crt \
smtp_tls_loglevel=2

12
setup/ssl.sh
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@ -28,7 +28,7 @@ source /etc/mailinabox.conf # load global vars
if [ ! -f /usr/bin/openssl ] \
|| [ ! -f "$STORAGE_ROOT/ssl/ssl_private_key.pem" ] \
|| [ ! -f "$STORAGE_ROOT/ssl/ssl_certificate.pem" ] \
|| [ ! -f "$STORAGE_ROOT/ssl/dh2048.pem" ]; then
|| [ ! -f "$STORAGE_ROOT/ssl/dh4096.pem" ]; then
echo "Creating initial SSL certificate and perfect forward secrecy Diffie-Hellman parameters..."
fi
@ -90,12 +90,10 @@ if [ ! -f "$STORAGE_ROOT/ssl/ssl_certificate.pem" ]; then
ln -s "$CERT" "$STORAGE_ROOT/ssl/ssl_certificate.pem"
fi
# Generate some Diffie-Hellman cipher bits.
# openssl's default bit length for this is 1024 bits, but we'll create
# 2048 bits of bits per the latest recommendations.
if [ ! -f "$STORAGE_ROOT/ssl/dh2048.pem" ]; then
openssl dhparam -out "$STORAGE_ROOT/ssl/dh2048.pem" 2048
fi
# We no longer generate Diffie-Hellman cipher bits. Following rfc7919 we use
# a predefined finite field group, in this case ffdhe4096 from
# https://raw.githubusercontent.com/internetstandards/dhe_groups/master/ffdhe4096.pem
cp -f conf/dh4096.pem $STORAGE_ROOT/ssl/
# Cleanup expired SSL certificates from $STORAGE_ROOT/ssl daily
cat > /etc/cron.daily/mailinabox-ssl-cleanup << EOF;

2
setup/web.sh
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@ -40,7 +40,7 @@ sed "s#STORAGE_ROOT#$STORAGE_ROOT#" \
# we're going up to 128.
#
# Drop TLSv1.0, TLSv1.1, following the Mozilla "Intermediate" recommendations
# at https://ssl-config.mozilla.org/#server=nginx&server-version=1.17.0&config=intermediate&openssl-version=1.1.1.
# at https://ssl-config.mozilla.org/#server=nginx&version=1.18.0&config=intermediate&openssl=3.0.2&guideline=5.7.
tools/editconf.py /etc/nginx/nginx.conf -s \
server_names_hash_bucket_size="128;" \
ssl_protocols="TLSv1.2 TLSv1.3;"