mailinabox/setup/dkim.sh

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# OpenDKIM: Sign outgoing mail with DKIM
########################################
# After this, you'll still need to run dns_update.sh to get the DKIM
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# signature in the DNS zones.
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source setup/functions.sh # load our functions
# Install DKIM
apt_install opendkim opendkim-tools
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# Make sure configuration directories exist.
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mkdir -p /etc/opendkim;
mkdir -p $STORAGE_ROOT/mail/dkim
# Used in InternalHosts and ExternalIgnoreList configuration directives.
# Not quite sure why.
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echo "127.0.0.1" > /etc/opendkim/TrustedHosts
if grep -q "ExternalIgnoreList" /etc/opendkim.conf; then
true; # already done
else
# Add various configuration options to the end.
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cat >> /etc/opendkim.conf << EOF;
MinimumKeyBits 1024
ExternalIgnoreList refile:/etc/opendkim/TrustedHosts
InternalHosts refile:/etc/opendkim/TrustedHosts
KeyTable refile:/etc/opendkim/KeyTable
SigningTable refile:/etc/opendkim/SigningTable
Socket inet:8891@localhost
RequireSafeKeys false
EOF
fi
# Create a new DKIM key if we don't have one already. This creates
# mail.private and mail.txt in $STORAGE_ROOT/mail/dkim. The former
# is the actual private key and the latter is the suggested DNS TXT
# entry which we'll want to include in our DNS setup.
if [ ! -f "$STORAGE_ROOT/mail/dkim/mail.private" ]; then
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# Should we specify -h rsa-sha256?
opendkim-genkey -r -s mail -D $STORAGE_ROOT/mail/dkim
fi
# Ensure files are owned by the opendkim user and are private otherwise.
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chown -R opendkim:opendkim $STORAGE_ROOT/mail/dkim
chmod go-rwx $STORAGE_ROOT/mail/dkim
# Add OpenDKIM as a milter to postfix, which is how it intercepts outgoing
# mail to perform the signing (by adding a mail header).
# Be careful. If we add other milters later, it needs to be concatenated on the smtpd_milters line.
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tools/editconf.py /etc/postfix/main.cf \
smtpd_milters=inet:127.0.0.1:8891 \
non_smtpd_milters=\$smtpd_milters \
milter_default_action=accept
# Restart services.
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service opendkim restart
service postfix restart