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upstream-tls-verify: Verified TLS to an inbound domain's upstream

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Owner, 2026-10-18: "Оба предложения делаем"; the mockup is c10cd78. The
security audit's M7: Required is Postfix's encrypt level, which checks no
certificate - it keeps the mail from a listener, not from one who answers
in the upstream's place.

- A fourth TLS mode, Verified, stored as Postfix's level secure (migration
  0014 rebuilds inbound_transports with the wider CHECK; schema 14) and
  written to the TLS policy map like the others. Postfix matches the
  certificate against the next hop's name (smtp_tls_secure_cert_match =
  nexthop, dot-nexthop, the default; postconf(5)), so Verified is refused
  for an upstream given by address (checkSecureHost).
- Postfix's SMTP client trusts Debian's ca-certificates bundle
  (smtp_tls_CAfile): Postfix trusts none by default (DEF_SMTP_TLS_CA_FILE
  "", DEF_TLS_APPEND_DEF_CA 0). The levels may and encrypt only log the
  verdict, so mail to recipients' MX is unchanged.
- The page: the select's fourth option, a help line under it, the lead
  "over verified TLS", the list's tag "verified"; Help word for word with
  the mockup; guide § Inbound relay, with a posttls-finger command to try
  an upstream first.

Tests: TestVerifiedTLSNeedsTheUpstreamsName, TestRenderInboundMapsSecure,
TestUpstreamTLSModeSecure; schema tests at 14. e2e
inbound_upstream_verified_tls: an address refused, a name saved as
"[sink]:25 secure" in tls_policy, the page says verified, the CA file set
and present, and posttls-finger -l secure with it calls the stand's
self-signed port 25 "Untrusted" (the stand has no TLS upstream). make e2e
(65 passed) and go vet + go test (26 packages) on the test server for this
tree. Tried against the live upstream from the 2.14.5 container:
mc-ent.mixfed.ru gives "Verified TLS connection established".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-18 10:27:37 +03:00
co-authored by Claude Opus 5.5
parent c10cd78eff
commit 6b4106f60e
17 changed files with 215 additions and 14 deletions
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docs/roadmap.md
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@@ -29,7 +29,7 @@ in `git log` and [CHANGELOG.md](../CHANGELOG.md).
| ID | Topic | Status | Progress | Plan |
|---|---|---|---|---|
| security-audit-2026-10-17 | Follow-ups of the 2026-10-17 security audit: A2 (high), seven mediums, the lows | stages 0-6 shipped `2.14.4` (2026-10-17); stage H (the host, S1-S3, S5) the owner's | 27/29 | [security-audit-2026-10-17.md](security-audit-2026-10-17.md) |
| upstream-tls-verify | Inbound: offer "Verified" TLS to the upstream (Postfix `secure`, the upstream's name checked), beside Required, which checks no certificate (audit M7) | proposed | — | — |
| upstream-tls-verify | Inbound: offer "Verified" TLS to the upstream (Postfix `secure`, the upstream's name checked), beside Required, which checks no certificate (audit M7) | built 2026-10-18 (owner: "Оба предложения делаем") | — | — |
| server-dmarc-hint | Server › Settings lists a DMARC record for the server's own name beside its DKIM and SPF (audit S3, product side) | built 2026-10-18 (owner: "Оба предложения делаем") | — | — |
| inbound-upstream-result | Inbound › Log shows what the upstream answered: sent, deferred, bounced, with its last reply | shipped `2.10.0` | 7/7 | [plans/inbound-upstream-result.md](plans/inbound-upstream-result.md) |
| health-setup-checks | Server › Health also checks the certificate's name, Postfix's greeting and the trusted proxy (was preflight) | shipped `2.11.0` | — | — |