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|
######################################################################
# ACL CONFIGURATION #
# Specifies access control lists for incoming SMTP mail #
######################################################################
begin acl
######################
# GENERAL CHECK ACLs #
######################
acl_check_mail_introduction:
require condition = ${if def:sender_helo_name}
set acl_m_msg = HELO/EHLO command required.
require verify = reverse_host_lookup/defer_ok
set acl_m_msg = HELO/EHLO lookup yielded mismatch.
accept
acl_check_rcpt_syntax:
deny local_parts = ^[.] : ^.*[@%!/|]
set acl_m_msg = Invalid local part.
accept
#########################
# MUA ACLs (submission) #
#########################
# Checks the link between a given mail alias and a given user.
# $acl_arg1: alias to check
# $acl_arg2: user
acl_check_alias:
require condition = ${lookup{$acl_arg1}lsearch{ALIASMAP} {${if eq{$value}{$acl_arg2} {yes}{no}}} {no}}
accept
acl_mua_mail:
require acl = acl_check_mail_introduction
message = Courtesy protocol violation: $acl_m_msg
require acl = acl_check_alias $sender_address $authenticated_id
message = Envelope address mismatch: $authenticated_id is not authorized to use $sender_address.
accept
acl_mua_rcpt:
require encrypted = *
message = Encrypted session required for message submission.
require authenticated = *
control = submission
control = dkim_disable_verify
message = Authentication required for message submission.
require acl = acl_check_rcpt_syntax
message = Syntactic validation failed: $acl_m_msg
require verify = sender
message = Sender verification failed.
accept
acl_mua_data:
require verify = header_names_ascii
message = Invalid character in header name.
require verify = header_syntax
message = Syntax error in header.
require acl = acl_check_alias ${address:$h_from:} $authenticated_id
message = Header address mismatch: $authenticated_id is not authorized to use ${address:$h_from:}.
accept
############
# MTA ACLs #
############
acl_mta_connect:
accept hosts = +trusted_relay_hosts
# Deny messages from hosts known to be bad.
drop dnslists = sbl-xbl.spamhaus.org : bl.spamcop.net
message = [RBL] $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
accept
acl_mta_mail:
require acl = acl_check_mail_introduction
message = Courtesy protocol violation: $acl_m_msg
accept hosts = +trusted_relay_hosts
defer spf = temperror
message = [SPF] Could not proceed through validation. Please try again later.
drop spf = permerror
message = [SPF] Syntax error in the SPF record of \
${if def:sender_address_domain {$sender_address_domain}{$sender_helo_name}}. \
Please see http://www.openspf.org/Why?scope=${if def:sender_address_domain \
{mfrom}{helo}};identity=${if def:sender_address_domain \
{$sender_address}{$sender_helo_name}};ip=$sender_host_address
drop spf = fail
message = [SPF] $sender_host_address is not allowed to send mail from \
${if def:sender_address_domain {$sender_address_domain}{$sender_helo_name}}. \
Please see http://www.openspf.org/Why?scope=${if def:sender_address_domain \
{mfrom}{helo}};identity=${if def:sender_address_domain \
{$sender_address}{$sender_helo_name}};ip=$sender_host_address
# Deny messages from end-user IP address ranges listed in the PBL, for which SPF didn't explicitly pass.
# It is safe to assume that legitimate home-hosted MTAs have an associated SPF record, that zombie machines would lack.
drop !spf = pass
dnslists = pbl.spamhaus.org
message = [RBL] $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
accept
acl_mta_rcpt:
require acl = acl_check_rcpt_syntax
message = Syntactic validation failed: $acl_m_msg
require verify = sender
message = Sender verification failed.
accept hosts = +relay_from_hosts
require domains = +local_domains : +relay_to_domains
message = Unhandled destination.
require verify = recipient
message = Recipient verification failed.
accept
.ifdef SPAMD_ADDRESS
SCAN_SPAM = yes
.else
SCAN_SPAM = no
.endif
acl_mta_data:
deny condition = ${if > {$max_received_linelength}{998}}
set acl_m_msg = Maximum allowed line length is 998 octets, got $max_received_linelength.
require verify = header_syntax
message = Syntax error in header.
warn condition = SCAN_SPAM
spam = nobody:true/defer_ok
remove_header = x-spam-bar : x-spam-score : x-spam-report : x-spam-status
add_header = X-Spam-Score: $spam_score ($spam_bar)
add_header = X-Spam-Report: $spam_report
add_header = X-Spam-Status: ${if eq{$spam_action}{reject} {Yes}{No}}
accept
# Checks the validity of each signatures in the message,
# and the presence of a required signature for the sender domain.
# Global var to enable mandatory signature check:
# dkim_verify_signers = $sender_address_domain:$dkim_signers
acl_mta_dkim:
defer dkim_status = invalid
message = [DKIM] Could not proceed through validation ($dkim_verify_reason). \
Please try again later.
deny dkim_status = fail
message = [DKIM] invalid signature ($dkim_verify_reason).
deny dkim_status = none
set acl_m_ddk = ${run{DIG_QUERY_COMMAND +short TXT ${quote:_domainkey.$sender_host_address}}}
condition = ${if match {$acl_m_ddk}{/o=-/} {yes}{no}}
message = [DKIM] required signature for $sender_host_address is missing.
accept
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