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inbound-antispam-panel: inbound journal milter on port 25

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Step 3/12 of docs/plans/inbound-antispam-panel.md.

The panel serves a second milter while the inbound relay is on
(internal/milter/inbound.go, socket INBOUND_JOURNAL_MILTER_SOCKET,
default /run/selfpost/inbound-journal.sock). build/postfix-config.sh
puts it last on port 25, after the optional antispam milter, with
default_action=accept; postfix-wrapper.sh waits for its socket. At
end-of-message it writes one inbound_spam_log row per recipient at an
inbound domain - other port-25 recipients (DMARC report addresses) get
none - and always accepts. With a filter attached it reads the verdict
from X-Rspamd-Action and X-Spamd-Result (action, score, up to six
weighted symbols, only what the patterns recognise, 255 bytes); without
one those headers are the sender's and are not read. The plan named
X-Rspamd-Score, which rspamd does not have.

The antispam compose fragment mounts rspamd/milter_headers.conf into
the sidecar so that it adds the two headers (checked in rspamd 3.11:
both routines exist and remove a sender's own headers of those names).

Store: InsertInboundSpam, IsInboundDomain.

Checked on the test server, uncommitted tree: go vet ./... ok,
go test ./... ok (22 packages), make e2e ok - the relayed message of
inbound_relay_delivers_and_refuses has its journal row (accept by
selfpost) and the DMARC report sent through the same listener has none.

Not yet seen in a real run: a verdict written by rspamd reaching this
milter. The e2e stand has no filter, and the test server's only inbound
domain has no upstream, so it accepts no mail.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-11 22:18:14 +03:00
co-authored by Claude Opus 5.5
parent a3cc52d6d4
commit 28ec784ae2
17 changed files with 748 additions and 31 deletions
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build/postfix-config.sh
+21 -1
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@@ -117,6 +117,9 @@ SUBMISSION_ENABLE="${SUBMISSION_ENABLE:-false}"
INBOUND_RELAY_ENABLE="${INBOUND_RELAY_ENABLE:-false}"
INBOUND_ANTISPAM_MILTER="${INBOUND_ANTISPAM_MILTER:-}"
INBOUND_ANTISPAM_MILTER_ACTION="${INBOUND_ANTISPAM_MILTER_ACTION:-accept}"
# The panel's inbound journal milter (monitoring, fail-open), on port 25 only
# and only while the inbound relay is on. Matched by postfix-wrapper.sh.
INBOUND_JOURNAL_SOCK="${INBOUND_JOURNAL_MILTER_SOCKET:-/run/selfpost/inbound-journal.sock}"
INBOUND_RATE_LIMIT_MESSAGES_PER_IP="${INBOUND_RATE_LIMIT_MESSAGES_PER_IP:-20}"
INBOUND_MESSAGE_SIZE_LIMIT="${INBOUND_MESSAGE_SIZE_LIMIT:-26214400}"
RELAY_DOMAINS_MAP="${POSTFIX_RELAY_DOMAINS:-/data/postfix/relay_domains}"
@@ -357,7 +360,8 @@ if [ "${INBOUND_RELAY_ENABLE}" = "true" ] || [ "${DMARC_REPORTS_ENABLE}" = "true
# would file inbound mail into the outbound send log under the *sender's*
# domain — polluting Deliveries and letting a forged From: consume that
# domain's level-2 rate-limit budget. So smtpd_milters is always overridden
# here: either the optional antispam milter, or nothing at all.
# here: the optional antispam milter, then - with the inbound relay on - the
# panel's inbound journal milter, or nothing at all.
INBOUND_MILTERS=""
if [ "${INBOUND_RELAY_ENABLE}" = "true" ] && [ -n "${INBOUND_ANTISPAM_MILTER}" ]; then
case "${INBOUND_ANTISPAM_MILTER}" in
@@ -376,6 +380,22 @@ if [ "${INBOUND_RELAY_ENABLE}" = "true" ] || [ "${DMARC_REPORTS_ENABLE}" = "true
esac
INBOUND_MILTERS="{${INBOUND_ANTISPAM_MILTER},default_action=${INBOUND_ANTISPAM_MILTER_ACTION}}"
fi
if [ "${INBOUND_RELAY_ENABLE}" = "true" ]; then
# Last in the chain: Postfix hands a message to its milters one after
# another at end-of-message, so this one reads the verdict headers the
# filter added and sees only what the filter let through. It watches and
# never refuses, and must never hold up someone else's mail: accept when
# it is down. A comma, not a space, between the two - see
# master_cf_set_smtp_inet_o.
case "${INBOUND_JOURNAL_SOCK}" in
/[A-Za-z0-9._/-]*) ;;
*)
echo "FATAL: INBOUND_JOURNAL_MILTER_SOCKET must be an absolute path, got: ${INBOUND_JOURNAL_SOCK}" >&2
exit 1
;;
esac
INBOUND_MILTERS="${INBOUND_MILTERS:+${INBOUND_MILTERS},}{unix:${INBOUND_JOURNAL_SOCK},default_action=accept}"
fi
PORT25_RATE="${INBOUND_RATE_LIMIT_MESSAGES_PER_IP}"
PORT25_SIZE="${INBOUND_MESSAGE_SIZE_LIMIT}"