password-reset: a confirmed e-mail, then a link to reset the password

Agreed by the owner on 2026-10-13 ("the e-mail must be confirmed");
notifications to an unconfirmed address settled on 2026-10-17: "Без
подтверждения слать". Mockups 2f5f5b2, route guard b7bbb2c, panel guard
0774da2.

Migration 0013: users.email_confirmed_at ('' for every address saved
before it) and user_links - the SHA-256 of a link's token, its user,
purpose (confirm, reset), address, created and expiry. A changed address
loses its mark (keepConfirmed, in UpdateUser and SaveUser).

internal/web/auth/links.go. A link is 256 bits from crypto/rand, mailed as
https://SELFPOST_HOSTNAME/... - never the request's Host. Confirmation:
24 h, sent when an address is saved (Account, or the global role's user
form) and by Account's Send the link again; its page /confirm/<token> has
a button (a GET changes nothing) and confirms only for a session of its
own account. Reset: /login/reset asks for a username and answers the same
for every name (the sign-in page, "If that account has a confirmed e-mail,
the link is on its way"), mailing after the answer; only a confirmed
address gets one, none within ten minutes of the last, five links an hour
per account, five requests in 15 minutes per client address;
/login/reset/<token> (30 min) sets the password with the link taken in
the same transaction that checks the address again
(store.TakeResetLink), then ends every session. Changing the e-mail on
Account asks for the current password. A password set on Account or the
user form removes the reset links; a restore removes every link; the stop
waits for links being mailed (Server.Drain); a rejected request's log line
hides a link's token (loggedPath).

Reviewed for security before the commit (2026-10-17): no high; two
medium and five low, all fixed here - confirming needs the account's
session and the mail does not name the account (a mistyped address was a
takeover); a reset request neither replaces the links already sent nor
spends the account's quota inside ten minutes; take-and-set atomic; the
confirmation mail sent after the answer; the stop waits for mail; a
restore deletes the links; the token kept out of the log.

Tests: store TestUserLinks, TestUserLinkTakenOnce, TestEmailConfirmation,
TestTakeResetLink; auth TestResetSendsALinkOnlyToAConfirmedAddress,
TestResetLinkSetsThePasswordOnce, TestResetLinkDiesWithTheAddress,
TestResetRequestsAreLimited, TestResetRequestsAreSpaced, TestConfirmLink,
TestLinkPathsWithoutAToken; handlers TestAccountEmailIsConfirmedByItsLink,
TestUserFormSendsANewAddressItsLink; web TestLoggedPathHidesTokens; the
view's pages and fixtures; e2e password_reset_by_e_mail runs it through
the sink (and checks a link from before the restore is dead). go vet +
go test (26 packages) and make e2e on the test server for this tree.

Docs: guide § Account, security.md (the bullet and what ends sessions),
architecture (routes), schema-migrations (row 13, users, user_links),
help #account (word for word with the mockup), roadmap row done,
CHANGELOG [Unreleased].

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/web/view/pages_test.go

@@ -290,14 +290,18 @@ func TestAccountHasTwoFormsEachItsOwnPost(t *testing.T) {
 		`<h1 class="title is-3">Account</h1>`, `Signed in as admin · global`,
 		`action="/account/profile"`, `name="username"`, `name="email"`, `value="mix@example.org"`,
 		`action="/account/password"`, `name="current_password"`, `name="new_password"`, `name="new_password_confirm"`,
-		`Your own address. A domain's report address can be filled with it from Domain settings.`,
+		`Your own address. Saving a new one sends it a link to confirm it; once confirmed it is where a link to reset your password can go. A domain's report address can be filled with it from Domain settings.`,
+		`E-mail <span class="tag is-warning is-light">not confirmed</span>`,
+		`<input class="input" id="profile_password" name="current_password" type="password" autocomplete="current-password">`,
+		`action="/account/email/confirm"`, `A link was sent to <span class="sp-mono">mix@example.org</span> at 14:02; it works once, for 24 hours.`,
 	)
 	// Account is Profile and Password; where a domain's reports go is the
 	// domain's own setting.
 	pageLacks(t, "Account", out, `send_log_retention_days`, `/account/dmarc`, `dmarc_default`, `<h2>DMARC reports</h2>`,
 		`Report authorization`, `default report address`, `id="dmarc"`)
-	// No form asks for another's fields: two forms, two submit buttons.
-	if got := strings.Count(out, `<form class="sp-form" method="post"`); got != 2 {
+	// No form asks for another's fields: the profile, the password and,
+	// while the address is not confirmed, its link again.
+	if got := strings.Count(out, `<form class="sp-form`); got != 3 {
 		t.Errorf("Account has %d forms, want 2", got)
 	}
 	// Two equal columns, one box each.