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Stop parallel login attempts from bypassing the rate limits

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johnnyq
2026-07-28 01:01:43 -04:00
parent 2e855f62c9
commit 7327ebb37c
1 changed files with 28 additions and 0 deletions
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28
login.php
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@@ -37,6 +37,22 @@ $session_user_agent = escapeSql($_SERVER['HTTP_USER_AGENT'] ?? '');
// IMPORTANT (Option B support): ensure this exists in this scope so logAudit() can use it
$session_user_id = intval($_SESSION['user_id'] ?? 0);
// The count below and the logAudit() failure write that feeds it are far apart, with
// password_verify() in between, so a burst of parallel attempts would all read the
// same sub-threshold count and all pass. Serialize per IP for the whole request.
// Only a POST can write a failure, so only a POST needs the lock. The connection is
// non-persistent (includes/db.php), so it releases at the end of the request - after
// the failure has been recorded. A timeout returns 0 and fails open rather than
// locking anyone out.
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$login_lock_name = 'itflow_login_ip_' . md5($session_ip);
$login_lock = mysqli_fetch_row(mysqli_query($mysqli, "SELECT GET_LOCK('$login_lock_name', 10)"));
if (empty($login_lock[0])) {
error_log("ITFlow: timed out waiting on the login rate limit lock for $session_ip, proceeding unserialized");
}
}
$row = mysqli_fetch_assoc(mysqli_query(
$mysqli,
"SELECT COUNT(log_id) AS failed_login_count
@@ -336,6 +352,18 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && (isset($_POST['login']) || isset($_
// counter, so it cannot be used to lock another user out.
$mfa_locked = false;
if (!empty($current_code)) {
// This counter needs its own lock. The IP lock above does not
// serialize a burst spread across hosts, and a burst spread
// across hosts is the exact case this per-account limit exists
// for. Keyed on the account, released with the request.
$mfa_lock_name = "itflow_login_mfa_$user_id";
$mfa_lock = mysqli_fetch_row(mysqli_query($mysqli, "SELECT GET_LOCK('$mfa_lock_name', 10)"));
if (empty($mfa_lock[0])) {
error_log("ITFlow: timed out waiting on the MFA rate limit lock for user $user_id, proceeding unserialized");
}
$row_mfa = mysqli_fetch_assoc(mysqli_query(
$mysqli,
"SELECT COUNT(log_id) AS failed_mfa_count