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60 lines
2.0 KiB
Bash
60 lines
2.0 KiB
Bash
# OpenDKIM: Sign outgoing mail with DKIM
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########################################
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# 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
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# Install DKIM
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apt_install opendkim opendkim-tools
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# Make sure configuration directories exist.
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mkdir -p /etc/opendkim;
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mkdir -p $STORAGE_ROOT/mail/dkim
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# Used in InternalHosts and ExternalIgnoreList configuration directives.
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# Not quite sure why.
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echo "127.0.0.1" > /etc/opendkim/TrustedHosts
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if grep -q "ExternalIgnoreList" /etc/opendkim.conf; then
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true; # already done
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else
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# Add various configuration options to the end.
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cat >> /etc/opendkim.conf << EOF;
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MinimumKeyBits 1024
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ExternalIgnoreList refile:/etc/opendkim/TrustedHosts
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InternalHosts refile:/etc/opendkim/TrustedHosts
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KeyTable refile:/etc/opendkim/KeyTable
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SigningTable refile:/etc/opendkim/SigningTable
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Socket inet:8891@localhost
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RequireSafeKeys false
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EOF
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fi
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# Create a new DKIM key if we don't have one already. This creates
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# mail.private and mail.txt in $STORAGE_ROOT/mail/dkim. The former
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# is the actual private key and the latter is the suggested DNS TXT
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# entry which we'll want to include in our DNS setup.
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if [ ! -f "$STORAGE_ROOT/mail/dkim/mail.private" ]; then
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# Should we specify -h rsa-sha256?
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opendkim-genkey -r -s mail -D $STORAGE_ROOT/mail/dkim
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fi
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# Ensure files are owned by the opendkim user and are private otherwise.
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chown -R opendkim:opendkim $STORAGE_ROOT/mail/dkim
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chmod go-rwx $STORAGE_ROOT/mail/dkim
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# Add OpenDKIM as a milter to postfix, which is how it intercepts outgoing
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# mail to perform the signing (by adding a mail header).
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# 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 \
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smtpd_milters=inet:127.0.0.1:8891 \
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non_smtpd_milters=\$smtpd_milters \
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milter_default_action=accept
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# Restart services.
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restart_service opendkim
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restart_service postfix
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