292 lines
9.4 KiB
Bash
292 lines
9.4 KiB
Bash
#!/bin/bash
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function _setup_security_stack
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{
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_log 'debug' 'Setting up Security Stack'
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__setup__security__postgrey
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__setup__security__postscreen
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# recreate auto-generated file
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local DMS_AMAVIS_FILE=/etc/amavis/conf.d/61-dms_auto_generated
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echo "# WARNING: this file is auto-generated." >"${DMS_AMAVIS_FILE}"
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echo "use strict;" >>"${DMS_AMAVIS_FILE}"
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__setup__security__spamassassin
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__setup__security__clamav
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echo '1; # ensure a defined return' >>"${DMS_AMAVIS_FILE}"
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chmod 444 "${DMS_AMAVIS_FILE}"
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__setup__security__fail2ban
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__setup__security__amavis
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}
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function __setup__security__postgrey
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{
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if [[ ${ENABLE_POSTGREY} -eq 1 ]]
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then
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_log 'debug' 'Enabling and configuring Postgrey'
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sedfile -i -E \
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's|(^smtpd_recipient_restrictions =.*)|\1, check_policy_service inet:127.0.0.1:10023|' \
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/etc/postfix/main.cf
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sed -i -e \
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"s|\"--inet=127.0.0.1:10023\"|\"--inet=127.0.0.1:10023 --delay=${POSTGREY_DELAY} --max-age=${POSTGREY_MAX_AGE} --auto-whitelist-clients=${POSTGREY_AUTO_WHITELIST_CLIENTS}\"|" \
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/etc/default/postgrey
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if ! grep -i 'POSTGREY_TEXT' /etc/default/postgrey
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then
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printf 'POSTGREY_TEXT=\"%s\"\n\n' "${POSTGREY_TEXT}" >>/etc/default/postgrey
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fi
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if [[ -f /tmp/docker-mailserver/whitelist_clients.local ]]
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then
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cp -f /tmp/docker-mailserver/whitelist_clients.local /etc/postgrey/whitelist_clients.local
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fi
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if [[ -f /tmp/docker-mailserver/whitelist_recipients ]]
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then
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cp -f /tmp/docker-mailserver/whitelist_recipients /etc/postgrey/whitelist_recipients
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fi
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else
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_log 'debug' 'Postscreen is disabled'
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fi
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}
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function __setup__security__postscreen
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{
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_log 'debug' 'Configuring Postscreen'
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sed -i \
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-e "s|postscreen_dnsbl_action = enforce|postscreen_dnsbl_action = ${POSTSCREEN_ACTION}|" \
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-e "s|postscreen_greet_action = enforce|postscreen_greet_action = ${POSTSCREEN_ACTION}|" \
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-e "s|postscreen_bare_newline_action = enforce|postscreen_bare_newline_action = ${POSTSCREEN_ACTION}|" /etc/postfix/main.cf
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if [[ ${ENABLE_DNSBL} -eq 0 ]]
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then
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_log 'debug' 'Disabling Postscreen DNSBLs'
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postconf 'postscreen_dnsbl_action = ignore'
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postconf 'postscreen_dnsbl_sites = '
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else
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_log 'debug' 'Postscreen DNSBLs are enabled'
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fi
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}
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function __setup__security__spamassassin
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{
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if [[ ${ENABLE_SPAMASSASSIN} -eq 1 ]]
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then
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_log 'debug' 'Enabling and configuring SpamAssassin'
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# shellcheck disable=SC2016
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sed -i -r 's|^\$sa_tag_level_deflt (.*);|\$sa_tag_level_deflt = '"${SA_TAG}"';|g' /etc/amavis/conf.d/20-debian_defaults
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# shellcheck disable=SC2016
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sed -i -r 's|^\$sa_tag2_level_deflt (.*);|\$sa_tag2_level_deflt = '"${SA_TAG2}"';|g' /etc/amavis/conf.d/20-debian_defaults
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# shellcheck disable=SC2016
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sed -i -r 's|^\$sa_kill_level_deflt (.*);|\$sa_kill_level_deflt = '"${SA_KILL}"';|g' /etc/amavis/conf.d/20-debian_defaults
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# fix cron.daily for spamassassin
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sed -i \
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's|invoke-rc.d spamassassin reload|/etc/init\.d/spamassassin reload|g' \
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/etc/cron.daily/spamassassin
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if [[ ${SA_SPAM_SUBJECT} == 'undef' ]]
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then
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# shellcheck disable=SC2016
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sed -i -r 's|^\$sa_spam_subject_tag (.*);|\$sa_spam_subject_tag = undef;|g' /etc/amavis/conf.d/20-debian_defaults
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else
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# shellcheck disable=SC2016
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sed -i -r 's|^\$sa_spam_subject_tag (.*);|\$sa_spam_subject_tag = '"'${SA_SPAM_SUBJECT}'"';|g' /etc/amavis/conf.d/20-debian_defaults
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fi
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# activate short circuits when SA BAYES is certain it has spam or ham.
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if [[ ${SA_SHORTCIRCUIT_BAYES_SPAM} -eq 1 ]]
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then
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# automatically activate the Shortcircuit Plugin
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sed -i -r 's|^# loadplugin Mail::SpamAssassin::Plugin::Shortcircuit|loadplugin Mail::SpamAssassin::Plugin::Shortcircuit|g' /etc/spamassassin/v320.pre
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sed -i -r 's|^# shortcircuit BAYES_99|shortcircuit BAYES_99|g' /etc/spamassassin/local.cf
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fi
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if [[ ${SA_SHORTCIRCUIT_BAYES_HAM} -eq 1 ]]
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then
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# automatically activate the Shortcircuit Plugin
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sed -i -r 's|^# loadplugin Mail::SpamAssassin::Plugin::Shortcircuit|loadplugin Mail::SpamAssassin::Plugin::Shortcircuit|g' /etc/spamassassin/v320.pre
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sed -i -r 's|^# shortcircuit BAYES_00|shortcircuit BAYES_00|g' /etc/spamassassin/local.cf
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fi
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if [[ -e /tmp/docker-mailserver/spamassassin-rules.cf ]]
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then
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cp /tmp/docker-mailserver/spamassassin-rules.cf /etc/spamassassin/
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fi
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if [[ ${SPAMASSASSIN_SPAM_TO_INBOX} -eq 1 ]]
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then
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_log 'trace' 'Configuring Spamassassin/Amavis to send SPAM to inbox'
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sed -i "s|\$final_spam_destiny.*=.*$|\$final_spam_destiny = D_PASS;|g" /etc/amavis/conf.d/49-docker-mailserver
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sed -i "s|\$final_bad_header_destiny.*=.*$|\$final_bad_header_destiny = D_PASS;|g" /etc/amavis/conf.d/49-docker-mailserver
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else
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_log 'trace' 'Configuring Spamassassin/Amavis to bounce SPAM'
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sed -i "s|\$final_spam_destiny.*=.*$|\$final_spam_destiny = D_BOUNCE;|g" /etc/amavis/conf.d/49-docker-mailserver
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sed -i "s|\$final_bad_header_destiny.*=.*$|\$final_bad_header_destiny = D_BOUNCE;|g" /etc/amavis/conf.d/49-docker-mailserver
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fi
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if [[ ${ENABLE_SPAMASSASSIN_KAM} -eq 1 ]]
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then
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_log 'trace' 'Configuring Spamassassin KAM'
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local SPAMASSASSIN_KAM_CRON_FILE=/etc/cron.daily/spamassassin_kam
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sa-update --import /etc/spamassassin/kam/kam.sa-channels.mcgrail.com.key
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cat >"${SPAMASSASSIN_KAM_CRON_FILE}" <<"EOF"
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#!/bin/bash
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RESULT=$(sa-update --gpgkey 24C063D8 --channel kam.sa-channels.mcgrail.com 2>&1)
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EXIT_CODE=${?}
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# see https://spamassassin.apache.org/full/3.1.x/doc/sa-update.html#exit_codes
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if [[ ${EXIT_CODE} -ge 4 ]]
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then
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echo -e "Updating SpamAssassin KAM failed:\n${RESULT}\n" >&2
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exit 1
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fi
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exit 0
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EOF
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chmod +x "${SPAMASSASSIN_KAM_CRON_FILE}"
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fi
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else
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_log 'debug' 'SpamAssassin is disabled'
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echo "@bypass_spam_checks_maps = (1);" >>"${DMS_AMAVIS_FILE}"
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rm -f /etc/cron.daily/spamassassin
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fi
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}
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function __setup__security__clamav
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{
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if [[ ${ENABLE_CLAMAV} -eq 1 ]]
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then
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_log 'debug' 'Enabling and configuring ClamAV'
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local FILE
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for FILE in /var/log/mail/{clamav,freshclam}.log
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do
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touch "${FILE}"
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chown clamav:adm "${FILE}"
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chmod 640 "${FILE}"
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done
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if [[ ${CLAMAV_MESSAGE_SIZE_LIMIT} != '25M' ]]
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then
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_log 'trace' "Setting ClamAV message scan size limit to '${CLAMAV_MESSAGE_SIZE_LIMIT}'"
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sedfile -i \
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"s/^MaxFileSize.*/MaxFileSize ${CLAMAV_MESSAGE_SIZE_LIMIT}/" \
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/etc/clamav/clamd.conf
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fi
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else
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_log 'debug' 'Disabling ClamAV'
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echo '@bypass_virus_checks_maps = (1);' >>"${DMS_AMAVIS_FILE}"
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rm -f /etc/logrotate.d/clamav-* /etc/cron.d/clamav-freshclam
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fi
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}
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function __setup__security__fail2ban
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{
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if [[ ${ENABLE_FAIL2BAN} -eq 1 ]]
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then
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_log 'debug' 'Enabling and configuring Fail2Ban'
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if [[ -e /tmp/docker-mailserver/fail2ban-fail2ban.cf ]]
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then
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cp /tmp/docker-mailserver/fail2ban-fail2ban.cf /etc/fail2ban/fail2ban.local
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fi
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if [[ -e /tmp/docker-mailserver/fail2ban-jail.cf ]]
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then
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cp /tmp/docker-mailserver/fail2ban-jail.cf /etc/fail2ban/jail.d/user-jail.local
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fi
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if [[ ${FAIL2BAN_BLOCKTYPE} != 'reject' ]]
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then
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echo -e '[Init]\nblocktype = drop' >/etc/fail2ban/action.d/nftables-common.local
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fi
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echo '[Definition]' >/etc/fail2ban/filter.d/custom.conf
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else
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_log 'debug' 'Fail2Ban is disabled'
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rm -f /etc/logrotate.d/fail2ban
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fi
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}
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function __setup__security__amavis
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{
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if [[ ${ENABLE_AMAVIS} -eq 1 ]]
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then
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_log 'debug' 'Configuring Amavis'
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if [[ -f /tmp/docker-mailserver/amavis.cf ]]
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then
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cp /tmp/docker-mailserver/amavis.cf /etc/amavis/conf.d/50-user
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fi
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sed -i -E \
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"s|(log_level).*|\1 = ${AMAVIS_LOGLEVEL};|g" \
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/etc/amavis/conf.d/49-docker-mailserver
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cat /etc/dms/postfix/master.d/postfix-amavis.cf >>/etc/postfix/master.cf
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postconf 'content_filter = smtp-amavis:[127.0.0.1]:10024'
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sed -i \
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"s|^#\$myhostname = \"mail.example.com\";|\$myhostname = \"${HOSTNAME}\";|" \
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/etc/amavis/conf.d/05-node_id
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else
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_log 'debug' 'Disabling Amavis'
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_log 'trace' 'Disabling Amavis cron job'
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mv /etc/cron.d/amavisd-new /etc/cron.d/amavisd-new.disabled
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chmod 0 /etc/cron.d/amavisd-new.disabled
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if [[ ${ENABLE_CLAMAV} -eq 1 ]] && [[ ${ENABLE_RSPAMD} -eq 0 ]]
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then
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_log 'warn' 'ClamAV will not work when Amavis & rspamd are disabled. Enable either Amavis or rspamd to fix it.'
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fi
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if [[ ${ENABLE_SPAMASSASSIN} -eq 1 ]]
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then
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_log 'warn' 'Spamassassin will not work when Amavis is disabled. Enable Amavis to fix it.'
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fi
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fi
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}
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# We can use Sieve to move spam emails to the "Junk" folder.
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function _setup_spam_to_junk
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{
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if [[ ${MOVE_SPAM_TO_JUNK} -eq 1 ]]
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then
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_log 'debug' 'Spam emails will be moved to the Junk folder'
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cat >/usr/lib/dovecot/sieve-global/after/spam_to_junk.sieve << EOF
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require ["fileinto","mailbox"];
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if anyof (header :contains "X-Spam-Flag" "YES",
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header :contains "X-Spam" "Yes") {
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fileinto "Junk";
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}
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EOF
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sievec /usr/lib/dovecot/sieve-global/after/spam_to_junk.sieve
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chown dovecot:root /usr/lib/dovecot/sieve-global/after/spam_to_junk.{sieve,svbin}
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if [[ ${ENABLE_SPAMASSASSIN} -eq 1 ]] && [[ ${SPAMASSASSIN_SPAM_TO_INBOX} -eq 0 ]]
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then
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_log 'warning' "'SPAMASSASSIN_SPAM_TO_INBOX=0' but it is required to be 1 for 'MOVE_SPAM_TO_JUNK=1' to work"
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fi
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else
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_log 'debug' 'Spam emails will not be moved to the Junk folder'
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fi
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}
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