mirror of
https://github.com/mail-in-a-box/mailinabox.git
synced 2024-11-23 02:27:05 +00:00
141 lines
5.5 KiB
Bash
Executable File
141 lines
5.5 KiB
Bash
Executable File
#!/bin/bash
|
|
# DKIM
|
|
# --------
|
|
#
|
|
# DKIMpy provides a service that puts a DKIM signature on outbound mail.
|
|
#
|
|
# The DNS configuration for DKIM is done in the management daemon.
|
|
|
|
source setup/functions.sh # load our functions
|
|
source /etc/mailinabox.conf # load global vars
|
|
|
|
# Remove openDKIM if present
|
|
apt-get purge -qq -y opendkim opendkim-tools
|
|
|
|
# Install DKIMpy-Milter
|
|
echo Installing DKIMpy/OpenDMARC...
|
|
apt_install dkimpy-milter python3-dkim opendmarc
|
|
|
|
# Make sure configuration directories exist.
|
|
mkdir -p /etc/dkim;
|
|
mkdir -p $STORAGE_ROOT/mail/dkim
|
|
|
|
# Used in InternalHosts and ExternalIgnoreList configuration directives.
|
|
# Not quite sure why.
|
|
echo "127.0.0.1" > /etc/dkim/TrustedHosts
|
|
|
|
# We need to at least create these files, since we reference them later.
|
|
touch /etc/dkim/KeyTable
|
|
touch /etc/dkim/SigningTable
|
|
|
|
tools/editconf.py /etc/dkimpy-milter/dkimpy-milter.conf -s \
|
|
"MacroList=daemon_name|ORIGINATING" \
|
|
"MacroListVerify=daemon_name|VERIFYING" \
|
|
"Canonicalization=relaxed/simple" \
|
|
"MinimumKeyBits=1024" \
|
|
"InternalHosts=refile:/etc/dkim/TrustedHosts" \
|
|
"KeyTable=refile:/etc/dkim/KeyTable" \
|
|
"KeyTableEd25519=refile:/etc/dkim/KeyTableEd25519" \
|
|
"SigningTable=refile:/etc/dkim/SigningTable" \
|
|
"Socket=inet:8892@127.0.0.1"
|
|
|
|
# Create a new DKIM key. This creates mail.key and mail.dns
|
|
# in $STORAGE_ROOT/mail/dkim. The former is the private key and
|
|
# the latter is the suggested DNS TXT entry which we'll include
|
|
# in our DNS setup. Note that the files are named after the
|
|
# 'selector' of the key, which we can change later on to support
|
|
# key rotation.
|
|
if [ ! -f "$STORAGE_ROOT/mail/dkim/mail.key" ]; then
|
|
# Check if there is an existing rsa key
|
|
if [ -f "$STORAGE_ROOT/mail/dkim/mail.private" ]; then
|
|
# Re-use existing key
|
|
cp -f $STORAGE_ROOT/mail/dkim/mail.private $STORAGE_ROOT/mail/dkim/mail.key
|
|
cp -f $STORAGE_ROOT/mail/dkim/mail.txt $STORAGE_ROOT/mail/dkim/mail.dns
|
|
else
|
|
# All defaults are supposed to be ok, default key for rsa is 2048 bit
|
|
dknewkey --ktype rsa $STORAGE_ROOT/mail/dkim/mail
|
|
|
|
# Force dns entry into the format dns_update.py expects
|
|
# We use selector mail for the rsa key, to be compatible with earlier installations of Mail-in-a-Box
|
|
sed -i 's/v=DKIM1;/mail._domainkey IN TXT ( "v=DKIM1; s=email;/' $STORAGE_ROOT/mail/dkim/mail.dns
|
|
echo '" )' >> $STORAGE_ROOT/mail/dkim/mail.dns
|
|
fi
|
|
|
|
# Change format from pkcs#8 to pkcs#1, dkimpy seemingly is not able to handle the #8 format
|
|
# See bug https://bugs.launchpad.net/dkimpy/+bug/1978835
|
|
line=$(head -n 1 mail.key)
|
|
if [ ! "$line" = "-----BEGIN RSA PRIVATE KEY-----" ]; then
|
|
# Generate pkcs#1 key from the pkcs#8 key
|
|
openssl pkey -in $STORAGE_ROOT/mail/dkim/mail.key -traditional -out $STORAGE_ROOT/mail/dkim/mail.key.1
|
|
mv -f $STORAGE_ROOT/mail/dkim/mail.key $STORAGE_ROOT/mail/dkim/mail.key.8
|
|
cp -f $STORAGE_ROOT/mail/dkim/mail.key.1 $STORAGE_ROOT/mail/dkim/mail.key
|
|
fi
|
|
fi
|
|
|
|
if [ ! -f "$STORAGE_ROOT/mail/dkim/box-ed25519.key" ]; then
|
|
# Generate ed25519 key
|
|
dknewkey --ktype ed25519 $STORAGE_ROOT/mail/dkim/box-ed25519
|
|
|
|
# For the ed25519 dns entry, we use selector box-ed25519
|
|
sed -i 's/v=DKIM1;/box-ed25519._domainkey IN TXT ( "v=DKIM1; s=email;/' $STORAGE_ROOT/mail/dkim/box-ed25519.dns
|
|
echo '" )' >> $STORAGE_ROOT/mail/dkim/box-ed25519.dns
|
|
fi
|
|
|
|
# Ensure files are owned by the dkimpy-milter user and are private otherwise.
|
|
chown -R dkimpy-milter:dkimpy-milter $STORAGE_ROOT/mail/dkim
|
|
chmod go-rwx $STORAGE_ROOT/mail/dkim
|
|
|
|
tools/editconf.py /etc/opendmarc.conf -s \
|
|
"Syslog=true" \
|
|
"Socket=inet:8893@[127.0.0.1]" \
|
|
"FailureReports=false"
|
|
|
|
# SPFIgnoreResults causes the filter to ignore any SPF results in the header
|
|
# of the message. This is useful if you want the filter to perform SPF checks
|
|
# itself, or because you don't trust the arriving header. This added header is
|
|
# used by spamassassin to evaluate the mail for spamminess.
|
|
|
|
tools/editconf.py /etc/opendmarc.conf -s \
|
|
"SPFIgnoreResults=true"
|
|
|
|
# SPFSelfValidate causes the filter to perform a fallback SPF check itself
|
|
# when it can find no SPF results in the message header. If SPFIgnoreResults
|
|
# is also set, it never looks for SPF results in headers and always performs
|
|
# the SPF check itself when this is set. This added header is used by
|
|
# spamassassin to evaluate the mail for spamminess.
|
|
|
|
tools/editconf.py /etc/opendmarc.conf -s \
|
|
"SPFSelfValidate=true"
|
|
|
|
# Disables generation of failure reports for sending domains that publish a
|
|
# "none" policy.
|
|
|
|
tools/editconf.py /etc/opendmarc.conf -s \
|
|
"FailureReportsOnNone=false"
|
|
|
|
# Add DKIMpy and OpenDMARC as milters to postfix, which is how DKIMpy
|
|
# intercepts outgoing mail to perform the signing (by adding a mail header)
|
|
# and how they both intercept incoming mail to add Authentication-Results
|
|
# headers. The order possibly/probably matters: OpenDMARC relies on the
|
|
# DKIM Authentication-Results header already being present.
|
|
#
|
|
# Be careful. If we add other milters later, this needs to be concatenated
|
|
# on the smtpd_milters line.
|
|
#
|
|
# The OpenDMARC milter is skipped in the SMTP submission listener by
|
|
# configuring smtpd_milters there to only list the DKIMpy milter
|
|
# (see mail-postfix.sh).
|
|
tools/editconf.py /etc/postfix/main.cf \
|
|
"smtpd_milters=inet:127.0.0.1:8892 inet:127.0.0.1:8893"\
|
|
non_smtpd_milters=\$smtpd_milters \
|
|
milter_default_action=accept
|
|
|
|
# We need to explicitly enable the opendmarc service, or it will not start
|
|
hide_output systemctl enable opendmarc
|
|
|
|
# Restart services.
|
|
restart_service dkimpy-milter
|
|
restart_service opendmarc
|
|
restart_service postfix
|
|
|