Files
selfpost/test/e2e/cert_reload_check.go
T
mixandClaude Opus 5.5 60c7b85f84
test / test (push) Canceled after 0s
findings of the reviews of audit stage 1
Technical review (Opus) and security review (Fable) of 9efc9c7..a59e3d4;
reports in the session's scratchpad. Fixed:

- B1 (verified bug): store.UpdateStatus read before writing in its
  transaction; a commit by another connection in between (the dmarc-ingest
  process opens the same file) failed it at once with "database is locked"
  and the delivery line was lost. The first statement is now a write.
- R3: a delivery line updated every row of its queue id and recipient; it
  now updates only the newest (Postfix reuses short ids). The sweep closes
  by row id (QueuedDelivery.ID, CloseUnreported(id)).
- R4: a contradicted sweep keeps a mark, reason "reconcile-contradicted",
  instead of losing which row it was.
- R1: contradicted cannot see a lost line (never read late). New counter
  reconcile_missed: at close, the sweep looks for the row's delivery line
  in mail.log and mail.log.1 (QueueLines). 0007 edited - it has run on no
  database but throwaway stands.
- R2: queued_over_lifetime cannot measure "what removing the sweep would
  leave" while the sweep runs; its text now says rows stuck despite the
  sweep, and the rule uses closed - missed - contradicted.
- cert-reload (R5, R6, R7, security medium/low): both files copied to .new
  and the copies checked as a pair before both are renamed; acts on the copy
  only when postconf says Postfix reads it; a failed reload is retried next
  pass; umask 077; says so when the mounted files cannot be read. The e2e
  case asserts Postfix reads the copy, the copy equals the mount, the key is
  600 root.
- Security low: a recipient with a quoted local part - the journal cut
  "a b"@x at the space, deliveryRe cut "a>b"@x at the ">" - matched no
  delivery line and was closed by the sweep. cleanAddress ends a bracketed
  address at the first ">" outside quotes; deliveryRe takes the recipient
  up to the ">, " before relay= (test fixtures given the relay= every real
  delivery line has).
- Security low: postqueue -p's error carries at most 512 bytes of output.
- Nits: addDeliveryLogDay refuses a column not on its list; the truncation
  test checks its message.
- To stage 2b (page wording, mockup-first): the history step of a bounced
  row says the receiving server refused it, false for a row the sweep
  closed. To the owner when stage 2b is reached: since M13 the "deferred"
  figure counts whole messages too, which "Connections turned away" would
  not name.

Found while verifying: the e2e's main positive path failed once with "553
not owned by user app1" - an smtpd idle from before the panel's reload took
the connection in the reload's second. Measured on the stand (one-off
probe, not committed): sending 0, 10, 40, 110 s after the save (two seconds
at the soonest) always met an smtpd started after the reload. The e2e now
waits for the sender map after each application it creates
(waitForSenderMap: AUTH, MAIL, RCPT, RSET - no message, no row), and the
level-1 case uses it instead of its own loop.

Docs: architecture § Queue reconcile, schema-migrations (rows 7 and 8,
chain head 8), CHANGELOG, audit plan (stage 1 note, the measured window,
a new stage 2b line: 62 lines), roadmap 15/62.

Evidence on the test server for this tree: go vet clean, go test ./... 23
packages ok, make e2e exit 0 (renewed certificate, hung panel, level 1 at
49/60).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-14 15:21:52 +03:00

97 lines
3.1 KiB
Go

package e2e
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"math/big"
"net"
"os"
"path/filepath"
"strings"
"time"
)
// servedSerial is the serial of the certificate Postfix presents on the
// implicit-TLS port.
func servedSerial() (*big.Int, error) {
conn, err := tls.DialWithDialer(&net.Dialer{Timeout: 5 * time.Second}, "tcp", smtpsAddr, &tls.Config{
InsecureSkipVerify: true,
ServerName: selfpostHostname,
})
if err != nil {
return nil, err
}
defer conn.Close()
certs := conn.ConnectionState().PeerCertificates
if len(certs) == 0 {
return nil, fmt.Errorf("no certificate presented")
}
return certs[0].SerialNumber, nil
}
func fileSerial(path string) (*big.Int, error) {
raw, err := os.ReadFile(path)
if err != nil {
return nil, err
}
block, _ := pem.Decode(raw)
if block == nil {
return nil, fmt.Errorf("%s holds no PEM block", path)
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
return cert.SerialNumber, nil
}
// checkCertRenewalPickedUp replaces the certificate in the stand's mount, as
// a renewer would, and waits for port 465 to present it without a restart.
// Postfix reads a copy made at start (postfix-config.sh); until 2.5.0 nothing
// renewed that copy, and a renewed certificate reached Postfix only when the
// container was restarted (audit 2026-10-12, H2). compose.override.yml sets
// TLS_RELOAD_INTERVAL_SECONDS to 2 so this does not wait a day.
func checkCertRenewalPickedUp(s *stack) error {
certPath := filepath.Join(s.stageDir, "certs", "fullchain.pem")
before, err := servedSerial()
if err != nil {
return fmt.Errorf("read the served certificate: %w", err)
}
if err := writeSelfSignedCert(certPath, filepath.Join(s.stageDir, "certs", "privkey.pem")); err != nil {
return fmt.Errorf("renew the certificate: %w", err)
}
want, err := fileSerial(certPath)
if err != nil {
return err
}
if want.Cmp(before) == 0 {
return fmt.Errorf("the renewed certificate has the old serial %s", before)
}
if err := waitFor("port 465 to present the renewed certificate", 30*time.Second, 500*time.Millisecond, func() (bool, error) {
got, err := servedSerial()
if err != nil {
return false, err
}
if got.Cmp(want) != 0 {
return false, fmt.Errorf("serial %s served, want %s", got, want)
}
return true, nil
}); err != nil {
return err
}
// The path that was broken is the one taken: Postfix reads the copy, and
// the copy is the renewed file, the key private to root.
out, err := s.execIn("selfpost", "sh", "-c",
"postconf -h smtpd_tls_cert_file && cmp /etc/postfix/tls/fullchain.pem /etc/postfix/tls-internal/fullchain.pem && "+
"cmp /etc/postfix/tls/privkey.pem /etc/postfix/tls-internal/privkey.pem && stat -c '%a %U' /etc/postfix/tls-internal/privkey.pem")
if err != nil {
return fmt.Errorf("Postfix's copy of the certificate: %v\n%s", err, out)
}
if !strings.Contains(out, "/etc/postfix/tls-internal/fullchain.pem\n") || !strings.Contains(out, "600 root") {
return fmt.Errorf("Postfix's copy of the certificate: %q, want Postfix reading it and the key 600 root", out)
}
return nil
}