Security review of the DMARC report path (Fable, 2026-10-11), which ran
for the first time in 2.0.0. No Critical or High finding. Fixed:
- Medium: a report was bounded only as 8 MiB of XML - some 160 000
records or one name of megabytes, all of it rows and table cells. At
most 5 000 records (more is ErrRejected, dropped), text fields cut to
255 bytes on a character boundary, a record's count capped.
- Medium: the cap of 500 reports was for the whole server, so a stranger
filing under one domain's address evicted every other domain's
reports. PruneDMARCReports counts per domain.
- Low: the pipe service ran up to default_process_limit (100) commands
at once against the panel's database; maxproc is 1.
- Low: the reason logged for a dropped message carried the sender's
bytes (header line, zip entry name) as they came; cut to 200 bytes and
reduced to printable ASCII, zip entry names quoted.
- Low: SELFPOST_DATA_DIR / SELFPOST_DB_PATH with whitespace or "$" would
reach the command through export_environment as another path; refused
at start when DMARC ingest is on.
Left as they are, told to the owner: the parse-failure count is a
lifetime figure shown under "This week"; a report larger than the
command reads is dropped as unreadable; nested multipart is not searched.
The hub's Retention line follows the design commit before this one.
security.md: the review, and the accepted-risk entry says what a
stranger can and cannot do now. The roadmap no longer calls the review
pending.
go vet ./cmd/... ./internal/dmarc/ ./internal/store/: ok
go test ./cmd/... ./internal/dmarc/ ./internal/store/ ./internal/web/...: ok
make e2e on the test server (with the port-25 scenarios of the next
commit): ok
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- The hint under "Last report: None yet" still said "Point rua= at the
hosted address below" - there is no such address any more, and nothing
is below. It names the three steps of the three-choice scheme: set a
domain to SelfPost hosted in its Domain settings, publish the DMARC
record the domain then shows, publish MX for the server's name.
- The hosted address form is Fact.Small, as in the mockup.
go test -count=1 ./internal/web/...: ok
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Follows the design commit before it.
- internal/dmarc: the ingest allow-list is the report address of each
domain that is on this host and nothing else;
DefaultHostedReportAddress and DefaultHostedSuggestion are removed.
Since 1.7.0 the general mailbox dmarc-reports@<hostname> was open
while no panel-wide default existed; the three-choice scheme had
left it open always.
- The DMARC hub's Ingest box shows the form of a hosted address,
dmarc-reports+<domain>@<hostname>.
- guide.md: what port 25 accepts.
Evidence: docs/assets/panel-redesign/evidence/dmarc.png re-shot (the
address form wraps after the plus sign in its column at 1440 px).
go test -count=1 ./internal/dmarc/... ./internal/web/... ./cmd/panel: ok
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Stage 2, step 4. Written by Sonnet, reviewed by Opus.
- Five pages named after their mockups: out-log, out-message, dmarc,
dmarc-domain, dmarc-report, with typed page data
(view/outbound_log.go, dmarc.go), fixtures and tests. The engine
pages deliveries and delivery are gone with their templates; the
three DMARC templates are written anew. All five old names are off
legacy_pages.txt.
- The log polls its table (GET /outbound/log/fragment, as before); the
page count in the box foot follows out of band, and the filter in
the head is no longer swapped away while it is being chosen.
- Handlers pass typed data; routes, query parameters, filters, paging
and authorization are unchanged.
- Kit: Foot.ID / Foot.OOB (attributes only, as on Head) and Fact.Small,
the mockup's "sp-mono sp-small" value, for a report id and an rua
that wrapped mid-word in their column.
- test/e2e status scrapers match the new tag markup. Not run: no
Docker here.
Fixed on the way
- The DMARC domain page read a field its source rows do not have and
answered 500 as soon as the domain had a source. It builds the rows
from the store's rollup now, with a test.
Differences from the mockups, for the owner:
- the log has no Status filter (the store filters by domain and
application only); a refused message is "rejected", a neutral tag as
the mockup's "rate-limited" is;
- the message history keeps the panel's own wording with full dates and
has no "accepted from <IP>" step - the client address is not stored;
- dmarc: before the first report the box says "None yet" with what to
check; a quiet mailbox is an amber "quiet" tag;
- dmarc-domain: the stamp is pass / (pass + fail) rounded down, amber
on any failure, red when nothing passed, absent without mail;
- dmarc-report: the title has no year; "this relay" marks record rows
as well as sources.
Known and left as it is (not introduced here): the DMARC hub answers 404
to a domain administrator while the menu shows the entry and the plan
gives that role the reports of its own domains. Opening it needs the
report list to refuse an empty domain filter first - for the stage-3
security review.
Evidence
- docs/assets/panel-redesign/evidence/out-log.png, out-message.png,
dmarc.png, dmarc-domain.png, dmarc-report.png: 1440 px wide, headless
Edge, real templates served locally with their fixtures - NOT from
the container (no Docker on this machine).
- panel/audit.js on the five pages at 1440 and 1280: 784 texts checked,
problems: [].
- Polling of the log was exercised in a browser against a local
fixture server with document.hidden overridden: four polls, one
table and one foot after each, the filter untouched.
- go test -count=1 ./internal/web/... ./cmd/panel
ok internal/web
ok internal/web/auth
ok internal/web/handlers
ok internal/web/validate
ok internal/web/view
ok cmd/panel
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
mixandClaude Opus 5.5