From d46a42f1c9fcf2191b42f9df10ae6dd876e6f10b Mon Sep 17 00:00:00 2001 From: Robert Kaiser Date: Wed, 26 Oct 2016 23:28:16 +0200 Subject: [PATCH] move helper functions to an abstract class --- authsystem.inc.php | 28 +++++++++++++-- authutils.php-class | 81 +++++++++++++++++++++++++++++++++++++++++++ index.php | 84 ++++++++------------------------------------- 3 files changed, 121 insertions(+), 72 deletions(-) create mode 100755 authutils.php-class diff --git a/authsystem.inc.php b/authsystem.inc.php index 65c349e..62c6a80 100644 --- a/authsystem.inc.php +++ b/authsystem.inc.php @@ -1,4 +1,8 @@ 10); require_once('../kairo/include/cbsm/util/document.php-class'); // Class for sending emails require_once('../kairo/include/classes/email.php-class'); +// Class for sending emails +require_once(__DIR__.'/authutils.php-class'); bindtextdomain('kairo_auth', 'en'); // XXX: Should negotiate locale. bind_textdomain_codeset('kairo_auth', 'utf-8'); @@ -20,8 +26,26 @@ bind_textdomain_codeset('kairo_auth', 'utf-8'); $db = new PDO($dbdata['dsn'], $dbdata['username'], $dbdata['password']); /* Creating the DB tables: -CREATE TABLE `auth_sessions` ( `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT , `sesskey` VARCHAR(150) NOT NULL DEFAULT '' , `user` MEDIUMINT UNSIGNED NULL DEFAULT NULL , `logged_in` BOOLEAN NOT NULL DEFAULT FALSE , `time_created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , `time_expire` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , PRIMARY KEY (`id`), INDEX (`sesskey`), INDEX (`time_expire`)); -CREATE TABLE `auth_users` ( `id` MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT , `email` VARCHAR(255) NOT NULL , `pwdhash` VARCHAR(255) NOT NULL , `status` ENUM('unverified','ok') NOT NULL DEFAULT 'unverified' , `verify_hash` VARCHAR(150) NULL DEFAULT NULL , PRIMARY KEY (`id`), UNIQUE (`email`)); +CREATE TABLE `auth_sessions` ( + `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT , + `sesskey` VARCHAR(150) NOT NULL DEFAULT '' , + `user` MEDIUMINT UNSIGNED NULL DEFAULT NULL , + `logged_in` BOOLEAN NOT NULL DEFAULT FALSE , + `time_created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , + `time_expire` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , + PRIMARY KEY (`id`), + INDEX (`sesskey`), + INDEX (`time_expire`) +); +CREATE TABLE `auth_users` ( + `id` MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT , + `email` VARCHAR(255) NOT NULL , + `pwdhash` VARCHAR(255) NOT NULL , + `status` ENUM('unverified','ok') NOT NULL DEFAULT 'unverified' , + `verify_hash` VARCHAR(150) NULL DEFAULT NULL , + PRIMARY KEY (`id`), + UNIQUE (`email`) +); */ // include our OAuth2 Server object diff --git a/authutils.php-class b/authutils.php-class new file mode 100755 index 0000000..6686f7b --- /dev/null +++ b/authutils.php-class @@ -0,0 +1,81 @@ + 70) { $errors[] = sprintf(_('Password too long (max. %s characters).'), 70); } + if ((strtolower($new_password) == strtolower($user_email)) || + in_array(strtolower($new_password), preg_split("/[@\.]+/", strtolower($user_email)))) { + $errors[] = _('The passwort can not be equal to your email or any part of it.'); + } + if ((strlen($new_password) < 15) && (preg_match('/^[a-zA-Z]+$/', $new_password))) { + $errors[] = sprintf(_('Your password must use characters other than normal letters or contain least %s characters.'), 15); + } + if (preg_match('/^\d+$/', $new_password)) { + $errors[] = sprintf(_('Your password cannot consist only of numbers.'), 15); + } + if (strlen(count_chars($new_password, 3)) < 5) { + $errors[] = sprintf(_('Password does have to contain at least %s different characters.'), 5); + } + return $errors; + } + + static function createSessionKey() { + return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string). + } + + static function createVerificationCode() { + return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string). + } + + static function createTimeCode($session, $offset = null, $validity_minutes = 10) { + // Matches TOTP algorithms, see https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm + $valid_seconds = intval($validity_minutes) * 60; + if ($valid_seconds < 60) { $valid_seconds = 60; } + $code_digits = 8; + $time = time(); + $rest = is_null($offset)?($time % $valid_seconds):intval($offset); // T0, will be sent as part of code to make it valid for the full duration. + $counter = floor(($time - $rest) / $valid_seconds); + $hmac = mhash(MHASH_SHA1, $counter, $session['id'].$session['sesskey']); + $offset = hexdec(substr(bin2hex(substr($hmac, -1)), -1)); // Get the last 4 bits as a number. + $totp = hexdec(bin2hex(substr($hmac, $offset, 4))) & 0x7FFFFFFF; // Take 4 bytes at the offset, discard highest bit. + $totp_value = sprintf('%0'.$code_digits.'d', substr($totp, -$code_digits)); + return $rest.'.'.$totp_value; + } + + static function verifyTimeCode($timecode_to_verify, $session, $validity_minutes = 10) { + if (preg_match('/^(\d+)\.\d+$/', $timecode_to_verify, $regs)) { + return ($timecode_to_verify === AuthUtils::createTimeCode($session, $regs[1], $validity_minutes)); + } + return false; + } +} +?> diff --git a/index.php b/index.php index ea1818b..2a560e8 100644 --- a/index.php +++ b/index.php @@ -53,7 +53,7 @@ if (!count($errors)) { if (!preg_match('/^[^@]+@[^@]+\.[^@]+$/', $_POST['email'])) { $errors[] = _('The email address is invalid.'); } - elseif (verifyTimeCode(@$_POST['tcode'], $session)) { + elseif (AuthUtils::verifyTimeCode(@$_POST['tcode'], $session)) { $result = $db->prepare('SELECT `id`, `pwdhash`, `email`, `status`, `verify_hash` FROM `auth_users` WHERE `email` = :email;'); $result->execute(array(':email' => $_POST['email'])); $user = $result->fetch(PDO::FETCH_ASSOC); @@ -72,7 +72,7 @@ if (!count($errors)) { } // Log user in - update session key for that, see https://wiki.mozilla.org/WebAppSec/Secure_Coding_Guidelines#Login - $sesskey = createSessionKey(); + $sesskey = AuthUtils::createSessionKey(); setcookie('sessionkey', $sesskey, 0, "", "", !$running_on_localhost, true); // Last two params are secure and httponly, secure is not set on localhost. // If the session has a user set, create a new one - otherwise take existing session entry. if (intval($session['user'])) { @@ -115,13 +115,13 @@ if (!count($errors)) { else { // new user: check password, create user and send verification; existing users: re-send verification or send password change instructions if (array_key_exists('pwd', $_POST)) { - $errors += checkPasswordConstraints(strval($_POST['pwd']), $_POST['email']); + $errors += AuthUtils::checkPasswordConstraints(strval($_POST['pwd']), $_POST['email']); } if (!count($errors)) { // Put user into the DB if (!$user['id']) { $newHash = password_hash($_POST['pwd'], PASSWORD_DEFAULT, $pwd_options); - $vcode = createVerificationCode(); + $vcode = AuthUtils::createVerificationCode(); $result = $db->prepare('INSERT INTO `auth_users` (`email`, `pwdhash`, `status`, `verify_hash`) VALUES (:email, :pwdhash, \'unverified\', :vcode);'); if (!$result->execute(array(':email' => $_POST['email'], ':pwdhash' => $newHash, ':vcode' => $vcode))) { // XXXlog: User insertion failure! @@ -162,14 +162,14 @@ if (!count($errors)) { } else { // Password reset requested with "Password forgotten?" function. - $vcode = createVerificationCode(); + $vcode = AuthUtils::createVerificationCode(); $result = $db->prepare('UPDATE `auth_users` SET `verify_hash` = :vcode WHERE `id` = :userid;'); if (!$result->execute(array(':vcode' => $vcode, ':userid' => $user['id']))) { // XXXlog: User insertion failure! $errors[] = _('Could not initiate reset request. Please contact KaiRo.at and tell the team about this.'); } else { - $resetcode = $vcode.dechex($user['id'] + $session['id']).'_'.createTimeCode($session, null, 60); + $resetcode = $vcode.dechex($user['id'] + $session['id']).'_'.AuthUtils::createTimeCode($session, null, 60); // Send email with instructions for resetting the password. $mail = new email(); $mail->setCharset('utf-8'); @@ -248,9 +248,9 @@ if (!count($errors)) { if ($row) { $tcode_session = $row; if (($regs[1] == $user['verify_hash']) && - verifyTimeCode($regs[3], $session, 60)) { + AuthUtils::verifyTimeCode($regs[3], $session, 60)) { // Set a new verify_hash for the actual password reset. - $user['verify_hash'] = createVerificationCode(); + $user['verify_hash'] = AuthUtils::createVerificationCode(); $result = $db->prepare('UPDATE `auth_users` SET `verify_hash` = :vcode WHERE `id` = :userid;'); if (!$result->execute(array(':vcode' => $user['verify_hash'], ':userid' => $user['id']))) { // XXXlog: Unexpected failure to reset verify_hash! @@ -287,10 +287,10 @@ if (!count($errors)) { $errors[] = _('Password reset failed. The reset form you used was not valid. Possibly it has expired and you need to initiate the password reset again.'); } // Check validity of time code. - if (!count($errors) && !verifyTimeCode($_POST['tcode'], $session)) { + if (!count($errors) && !AuthUtils::verifyTimeCode($_POST['tcode'], $session)) { $errors[] = _('Password reset failed. The reset form you used was not valid. Possibly it has expired and you need to initiate the password reset again.'); } - $errors += checkPasswordConstraints(strval($_POST['pwd']), $user['email']); + $errors += AuthUtils::checkPasswordConstraints(strval($_POST['pwd']), $user['email']); if (!count($errors)) { $newHash = password_hash($_POST['pwd'], PASSWORD_DEFAULT, $pwd_options); $result = $db->prepare('UPDATE `auth_users` SET `pwdhash` = :pwdhash, `verify_hash` = \'\' WHERE `id` = :userid;'); @@ -308,7 +308,7 @@ if (!count($errors)) { } if (is_null($session)) { // Create new session and set cookie. - $sesskey = createSessionKey(); + $sesskey = AuthUtils::createSessionKey(); setcookie('sessionkey', $sesskey, 0, "", "", !$running_on_localhost, true); // Last two params are secure and httponly, secure is not set on localhost. $result = $db->prepare('INSERT INTO `auth_sessions` (`sesskey`, `time_expire`) VALUES (:sesskey, :expire);'); $result->execute(array(':sesskey' => $sesskey, ':expire' => gmdate('Y-m-d H:i:s', strtotime('+5 minutes')))); @@ -350,7 +350,7 @@ if (!count($errors)) { $inptxt->setAttribute('required', ''); $inptxt->setAttribute('placeholder', _('Email')); $litem = $ulist->appendElement('li'); - $litem->appendInputHidden('tcode', createTimeCode($session)); + $litem->appendInputHidden('tcode', AuthUtils::createTimeCode($session)); $submit = $litem->appendInputSubmit(_('Send instructions to email')); } elseif ($pagetype == 'resetpwd') { @@ -373,7 +373,7 @@ if (!count($errors)) { $inptxt->setAttribute('class', 'login'); $litem = $ulist->appendElement('li'); $litem->appendInputHidden('reset', ''); - $litem->appendInputHidden('tcode', createTimeCode($session)); + $litem->appendInputHidden('tcode', AuthUtils::createTimeCode($session)); if (!$session['logged_in'] && strlen(@$user['verify_hash'])) { $litem->appendInputHidden('vcode', $user['verify_hash']); } @@ -429,7 +429,7 @@ if (!count($errors)) { $label->setAttribute('id', 'rememprompt'); $label->setAttribute('class', 'loginprompt'); $litem = $ulist->appendElement('li'); - $litem->appendInputHidden('tcode', createTimeCode($session)); + $litem->appendInputHidden('tcode', AuthUtils::createTimeCode($session)); $submit = $litem->appendInputSubmit(_('Log in / Register')); $submit->setAttribute('class', 'loginbutton'); } @@ -449,60 +449,4 @@ if (count($errors)) { // Send HTML to client. print($document->saveHTML()); - -// ********** helper functions ********** - -function checkPasswordConstraints($new_password, $user_email) { - $errors = array(); - if ($new_password != trim($new_password)) { - $errors[] = _('Password must not start or end with a whitespace character like a space.'); - } - if (strlen($new_password) < 8) { $errors[] = sprintf(_('Password too short (min. %s characters).'), 8); } - if (strlen($new_password) > 70) { $errors[] = sprintf(_('Password too long (max. %s characters).'), 70); } - if ((strtolower($new_password) == strtolower($user_email)) || - in_array(strtolower($new_password), preg_split("/[@\.]+/", strtolower($user_email)))) { - $errors[] = _('The passwort can not be equal to your email or any part of it.'); - } - if ((strlen($new_password) < 15) && (preg_match('/^[a-zA-Z]+$/', $new_password))) { - $errors[] = sprintf(_('Your password must use characters other than normal letters or contain least %s characters.'), 15); - } - if (preg_match('/^\d+$/', $new_password)) { - $errors[] = sprintf(_('Your password cannot consist only of numbers.'), 15); - } - if (strlen(count_chars($new_password, 3)) < 5) { - $errors[] = sprintf(_('Password does have to contain at least %s different characters.'), 5); - } - return $errors; -} - -function createSessionKey() { - return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string). -} - -function createVerificationCode() { - return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string). -} - -function createTimeCode($session, $offset = null, $validity_minutes = 10) { - // Matches TOTP algorithms, see https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm - $valid_seconds = intval($validity_minutes) * 60; - if ($valid_seconds < 60) { $valid_seconds = 60; } - $code_digits = 8; - $time = time(); - $rest = is_null($offset)?($time % $valid_seconds):intval($offset); // T0, will be sent as part of code to make it valid for the full duration. - $counter = floor(($time - $rest) / $valid_seconds); - $hmac = mhash(MHASH_SHA1, $counter, $session['id'].$session['sesskey']); - $offset = hexdec(substr(bin2hex(substr($hmac, -1)), -1)); // Get the last 4 bits as a number. - $totp = hexdec(bin2hex(substr($hmac, $offset, 4))) & 0x7FFFFFFF; // Take 4 bytes at the offset, discard highest bit. - $totp_value = sprintf('%0'.$code_digits.'d', substr($totp, -$code_digits)); - return $rest.'.'.$totp_value; -} - -function verifyTimeCode($timecode_to_verify, $session, $validity_minutes = 10) { - if (preg_match('/^(\d+)\.\d+$/', $timecode_to_verify, $regs)) { - return ($timecode_to_verify === createTimeCode($session, $regs[1], $validity_minutes)); - } - return false; -} - ?> -- 2.43.0