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Merge pull request #238 from william-stacken/master

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Resolve "Anyone can send mails from a local user as long as the recipient is another local user"
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Luke Smith 2023-01-26 21:42:05 +00:00 committed by GitHub
commit 2dc5e05754
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emailwiz.sh Executable file → Normal file
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@ -94,6 +94,8 @@ postconf -e 'smtpd_sasl_type = dovecot'
postconf -e 'smtpd_sasl_path = private/auth'
# Sender and recipient restrictions
postconf -e "smtpd_sender_login_maps = pcre:/etc/postfix/login_maps.pcre"
postconf -e "smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_sender_login_mismatch"
postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unknown_recipient_domain'
# NOTE: the trailing slash here, or for any directory name in the home_mailbox
@ -106,6 +108,10 @@ postconf -e 'home_mailbox = Mail/Inbox/'
# Prevent "Received From:" header in sent emails in order to prevent leakage of public ip addresses
postconf -e "header_checks = regexp:/etc/postfix/header_checks"
# Create a login map file that ensures that if a sender wants to send a mail from a user at our local
# domain, they must be authenticated as that user
echo "/^(.*)@$(sh -c "echo $domain | sed 's/\./\\\./'")$/ \${1}" > /etc/postfix/login_maps.pcre
# strips "Received From:" in sent emails
echo "/^Received:.*/ IGNORE
/^X-Originating-IP:/ IGNORE" >> /etc/postfix/header_checks