166 lines
7.7 KiB
PHP
166 lines
7.7 KiB
PHP
<?php
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/**
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* request_new_otp.php — Resend OTP during the 2-factor login flow
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*
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* Called by: login page AJAX "Resend OTP" button on the OTP input screen.
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* Input: All data sourced from $_SESSION (written by login_otp.php).
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* No new user input is accepted — credentials are re-read from session
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* to avoid re-exposing the password in a second HTTP request.
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*
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* This endpoint regenerates a fresh TOTP and resends the OTP email without
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* requiring the user to re-enter their username and password. It is only
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* reachable after login_otp.php has successfully validated credentials and
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* written the login session state.
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*
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* Full flow:
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* 1. Reload username, password, and user_id from session.
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* 2. Fetch the full user row (need the password hash to regenerate OTP
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* and the email address to resend to).
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* 3. Re-verify the stored password against the session-stored hash.
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* This is a safety re-check — the session could theoretically have been
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* tampered with between login_otp.php and this call.
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* 4. On password mismatch → clear cookies, return "Incorrect Password".
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* 5. On success:
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* a. Generate a fresh 6-digit TOTP (new timestamp → new OTP).
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* b. Generate a new 6-letter reference number.
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* c. Send the OTP email via system SMTP ($SMTP from config.php).
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* Note: uses system-level SMTP unconditionally (unlike login_otp.php
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* which tries the company SMTP first). The if(true) wrapper is a
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* placeholder left from the original — email always sends.
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* d. Clear session and repopulate with new OTP state.
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* 6. Return { success: 1, message: "Login Complete!" }.
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*
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* Session keys read:
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* login_data['username'], login_data['password'], login_user_id
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*
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* Session keys overwritten:
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* login_data, otp, otpTime, reference, user_email, login_user_id
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* (same keys as login_otp.php — login_confirm.php reads the same structure)
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*
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* Response JSON:
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* On success: { "success": 1, "message": "Login Complete!" }
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* On failure: { "message": "Incorrect Password" }
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*/
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require_once '../../../session.php';
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require_once '../../../config.php';
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require_once '../../../preset.php';
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define('UNAUTHENTICATED_ROUTE', true);
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require_once '../../../assets/utils/db_auth.php';
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// ── Step 1: Reload credentials from session ───────────────────────────────────
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// These were stored by login_otp.php so the user doesn't have to retype them.
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$data["username"] = $_SESSION["login_data"]['username'];
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$data["password"] = $_SESSION["login_data"]['password'];
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$user_id = (int)$_SESSION["login_user_id"];
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// ── Step 2: Fetch user record ─────────────────────────────────────────────────
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$sth = $pdo1->prepare("select * from user where user_id = :user_id limit 1;");
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$sth->execute([":user_id" => $user_id]);
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$temp = $sth->fetch(PDO::FETCH_ASSOC);
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$user_email = $temp["email"];
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// ── Step 3–4: Re-verify password ─────────────────────────────────────────────
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// Safety check — ensures the session hasn't been tampered with between
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// login_otp.php and this resend call.
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if (password_verify(trim($data["password"]), $temp["password"])) {
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// ── Step 5a: Generate fresh 6-digit TOTP ──────────────────────────────────
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// Same HMAC-SHA1 algorithm as login_otp.php and login_confirm.php.
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// A new $otpTime is captured so the OTP window resets from this moment.
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function generateOTP($sercet_key, $time_step = 180, $length = 6) {
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global $otpTime;
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$otpTime = time(); // new timestamp — extends the 5-minute validity window
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$counter = floor($otpTime / $time_step);
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$data = pack("NN", 0, $counter);
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$hash = hash_hmac('sha1', $data, $sercet_key, true);
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$offset = ord(substr($hash, -1)) & 0x0F;
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$value = unpack("N", substr($hash, $offset, 4));
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$otp = ($value[1] & 0x7FFFFFFF) % pow(10, $length);
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return str_pad(strval($otp), $length, '0', STR_PAD_LEFT);
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}
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// ── Step 5b: Generate 6-letter reference number ───────────────────────────
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// Converts a second TOTP (derived from the first OTP as the key) to a
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// base-26 uppercase letter string shown on the OTP input screen.
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function numberToLetters($num) {
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$result = '';
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while ($num > 0) {
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$mod = ($num - 1) % 26;
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$result = chr(65 + $mod) . $result;
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$num = intval(($num - $mod) / 26);
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}
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return str_pad($result, 6, 'A', STR_PAD_LEFT);
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}
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$otp = generateOTP($temp["password"]);
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$reference_number = numberToLetters(generateOTP($otp));
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// ── Step 5c: Send OTP email ───────────────────────────────────────────────
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// Uses the system-level $SMTP config from config.php.
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// The if(true) wrapper is a no-op placeholder from the original code —
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// the email block always executes.
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require "../../../assets/utils/module/mailer.php";
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if (true) {
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$mailer = new mailer(["pdo1" => $pdo1]);
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$mailer->send_email([
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"company_id" => 0,
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"smtp" => $SMTP,
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"subject" => "One Time Password (OTP) For reference number " . $reference_number,
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"message" => implode("\n", [
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"Dear WMS user,",
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"",
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"You requested a One-Time Password (OTP) to log in to WMS.",
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"",
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"Please use the OTP below to complete your request:",
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"• OTP code: " . $otp,
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"• Reference number: " . $reference_number,
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"",
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"Please note:",
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"• This code will expire in 3 minutes. Please complete your action promptly.",
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"• Do not share this code with anyone to keep your account secure.",
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"• If you did not request this code, please ignore this email.",
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]),
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"channel_name" => "WMS LOGIN OTP ",
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"to" => $user_email,
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"key" => $pinkey,
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]);
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}
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// ── Step 5d: Reset session with new OTP state ─────────────────────────────
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// Full session is cleared before repopulating to avoid stale state
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// from the previous OTP attempt leaking into this one.
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$_SESSION = [];
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$_SESSION["login_data"] = $data;
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$_SESSION["otp"] = $otp;
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$_SESSION["otpTime"] = $otpTime; // new timestamp — login_confirm.php uses this
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$_SESSION["reference"] = $reference_number;
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$_SESSION["user_email"] = $user_email;
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$_SESSION["login_user_id"] = $user_id;
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// ── Step 6: Respond ───────────────────────────────────────────────────────
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$answer["success"] = 1;
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$answer["message"] = "Login Complete!";
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exit(json_encode($answer));
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} else {
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// ── Password mismatch — clear cookies and reject ──────────────────────────
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$answer["message"] = "Incorrect Password";
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setcookie("u", "", time() - 1, "/");
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setcookie("h1", "", time() - 1, "/");
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setcookie("h2", "", time() - 1, "/");
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exit(json_encode($answer));
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}
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$answer["success"] = 1;
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exit(json_encode($answer)); |