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Merge pull request #427 from pichak/add-sender-login-mismatch 

Reject outgoing mail if MAIL FROM (envelope sender) does not match login name or is not an alias that directs mail (directly) to login name.
This commit is contained in:
Joshua Tauberer 2015-06-24 18:03:03 -04:00
parent 8eb71483f3 fc03ce9b2f
commit 13958ba4df
2 changed files with 18 additions and 1 deletions
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3
setup/mail-postfix.sh
View File

@ -160,6 +160,7 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
#
# * `reject_non_fqdn_sender`: Reject not-nice-looking return paths.
# * `reject_unknown_sender_domain`: Reject return paths with invalid domains.
# * `reject_authenticated_sender_login_mismatch`: Reject if mail FROM address does not match the client SASL login
# * `reject_rhsbl_sender`: Reject return paths that use blacklisted domains.
# * `permit_sasl_authenticated`: Authenticated users (i.e. on port 587) can skip further checks.
# * `permit_mynetworks`: Mail that originates locally can skip further checks.
@ -173,7 +174,7 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
# whitelisted) then postfix does a DEFER_IF_REJECT, which results in all "unknown user" sorts of messages turning into #NODOC
# "450 4.7.1 Client host rejected: Service unavailable". This is a retry code, so the mail doesn't properly bounce. #NODOC
tools/editconf.py /etc/postfix/main.cf \
smtpd_sender_restrictions="reject_non_fqdn_sender,reject_unknown_sender_domain,reject_rhsbl_sender dbl.spamhaus.org" \
smtpd_sender_restrictions="reject_non_fqdn_sender,reject_unknown_sender_domain,reject_authenticated_sender_login_mismatch,reject_rhsbl_sender dbl.spamhaus.org" \
smtpd_recipient_restrictions=permit_sasl_authenticated,permit_mynetworks,"reject_rbl_client zen.spamhaus.org",reject_unlisted_recipient,"check_policy_service inet:127.0.0.1:10023"
# Postfix connects to Postgrey on the 127.0.0.1 interface specifically. Ensure that

16
setup/mail-users.sh
View File

@ -69,6 +69,22 @@ tools/editconf.py /etc/postfix/main.cf \
smtpd_sasl_path=private/auth \
smtpd_sasl_auth_enable=yes
# ### Sender Validation
# Use a Sqlite3 database to set login maps. This is used with
# reject_authenticated_sender_login_mismatch to see if user is
# allowed to send mail using FROM field specified in the request.
tools/editconf.py /etc/postfix/main.cf \
smtpd_sender_login_maps=sqlite:/etc/postfix/sender-login-maps.cf
# SQL statement to set login map which includes the case when user is
# sending email using a valid alias.
# This is the same as virtual-alias-maps.cf, See below
cat > /etc/postfix/sender-login-maps.cf << EOF;
dbpath=$db_path
query = SELECT destination from (SELECT destination, 0 as priority FROM aliases WHERE source='%s' UNION SELECT email as destination, 1 as priority FROM users WHERE email='%s') ORDER BY priority LIMIT 1;
EOF
# ### Destination Validation
# Use a Sqlite3 database to check whether a destination email address exists,