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user-reauth: the user form asks for your account password (audit A2)

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Security audit 2026-10-17, finding A2 (high), stage 0; the mockup is
2c27275. A stolen global session could set its own password on the user
form - no current password asked, the session kept - and then pass the
backup's reauth with it, or add a second global user with a known
password. Now the user form calls reauth (the backup's check: bcrypt
against the signed-in user's own hash, under auth.AllowPasswordChange) when
it adds a user and when a save sets a password, changes the e-mail (reset
links go there) or changes the role, the own account included; deleting a
user asks too, refused on its own confirmation page (renderUserDelete, a
Flash on UserDelete). Name and reach alone are not asked. Missing or wrong:
401 on the same page, "Your account password is incorrect.", nothing saved.

Tests: TestUserFormAsksForTheAccountPassword (create, each of password,
e-mail, role, own password, reach alone, delete); the user-form tests send
the field (withAccountPassword gives root a real hash and h an auth
module). go vet, go test ./internal/web/... on Windows.

Docs: security.md § Backup and domain export, guide § Users, help word for
word with the mockup; CHANGELOG [Unreleased] Security; plan line ticked.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-17 21:28:18 +03:00
co-authored by Claude Opus 5.5
parent 2c27275970
commit a37aba6594
17 changed files with 246 additions and 24 deletions
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internal/web/handlers/handlers_dmarc_test.go
+1 -1
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@@ -286,7 +286,7 @@ func TestDeletingAUserLeavesDomainAddressesAndNamesNobody(t *testing.T) {
lacks(t, name+" for the co-administrator", body, `boss-private@example.org`, `admin&#39;s`, `s default`, `Another user`)
}
rec := send(s.h.HandleUserDelete, &globalPrincipal, "POST", "/server/users/"+idStr(ops.ID)+"/delete", map[string]string{"uid": idStr(ops.ID)}, url.Values{})
rec := send(s.h.HandleUserDelete, &globalPrincipal, "POST", "/server/users/"+idStr(ops.ID)+"/delete", map[string]string{"uid": idStr(ops.ID)}, url.Values{"account_password": {"correct-password-here!"}})
if rec.Code != http.StatusSeeOther {
t.Fatalf("deleting a user = %d:\n%s", rec.Code, rec.Body.String())
}