[AuthCrypt] Password storage and comparison improvements
Password hashes are now stored in a TEXT attribute, not limited to 199 symbols. That limitation makes no sense as password hashes are not the kind of information to be indexed. Actually replace crypt() with password_verify() for password checking, current code left password_verify() unused. Only update passwords when they use a different algorithm from the current default. Previously "overwrite" meant rehashing every login. Replace the "argon" boolean option with "algorithm" and "algorithm_options" for better configurability. The default remains whichever is default for PHP's password_hash.
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Alexei Sorokin
parent
c85feeaa1f
commit
7d7dbe627b
@ -31,7 +31,7 @@ class User extends Managed_DataObject
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public $__table = 'user'; // table name
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public $id; // int(4) primary_key not_null
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public $nickname; // varchar(64) unique_key
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public $password; // varchar(191) not 255 because utf8mb4 takes more space
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public $password; // text
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public $email; // varchar(191) unique_key not 255 because utf8mb4 takes more space
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public $incomingemail; // varchar(191) unique_key not 255 because utf8mb4 takes more space
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public $emailnotifysub; // bool default_true
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@ -65,7 +65,7 @@ class User extends Managed_DataObject
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'fields' => array(
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'id' => array('type' => 'int', 'not null' => true, 'description' => 'foreign key to profile table'),
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'nickname' => array('type' => 'varchar', 'length' => 64, 'description' => 'nickname or username, duped in profile'),
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'password' => array('type' => 'varchar', 'length' => 191, 'description' => 'salted password, can be null for OpenID users'),
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'password' => array('type' => 'text', 'description' => 'salted password, can be null for OpenID users'),
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'email' => array('type' => 'varchar', 'length' => 191, 'description' => 'email address for password recovery etc.'),
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'incomingemail' => array('type' => 'varchar', 'length' => 191, 'description' => 'email address for post-by-email'),
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'emailnotifysub' => array('type' => 'bool', 'default' => true, 'description' => 'Notify by email of subscriptions'),
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@ -15,7 +15,7 @@
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Module to use crypt() for user password hashes
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* Module to use password_hash() for user password hashes
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*
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* @category Module
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* @package GNUsocial
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@ -27,17 +27,44 @@
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defined('GNUSOCIAL') || die;
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if (version_compare(PHP_VERSION, '7.4.0', '<')) {
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function password_algos(): array
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{
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$algos = [PASSWORD_BCRYPT];
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defined('PASSWORD_ARGON2I') && $algos[] = PASSWORD_ARGON2I;
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defined('PASSWORD_ARGON2ID') && $algos[] = PASSWORD_ARGON2ID;
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return $algos;
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}
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}
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class AuthCryptModule extends AuthenticationModule
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{
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const MODULE_VERSION = '2.0.0';
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protected $statusnet = true; // if true, also check StatusNet style password hash
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protected $algorithm = PASSWORD_DEFAULT;
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protected $algorithm_options = [];
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protected $overwrite = true; // if true, password change means overwrite with crypt()
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protected $argon = false; // Use Argon if supported.
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protected $statusnet = true; // if true, also check StatusNet-style password hash
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public $provider_name = 'crypt'; // not actually used
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// FUNCTIONALITY
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public function onInitializePlugin()
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{
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if (!in_array($this->algorithm, password_algos())) {
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common_log(
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LOG_ERR,
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"Unsupported password hashing algorithm: {$this->algorithm}"
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);
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$this->algorithm = PASSWORD_DEFAULT;
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}
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// Make "'cost' = 12" the default option, but only if bcrypt
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if ($this->algorithm === PASSWORD_BCRYPT
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&& !array_key_exists('cost', $this->algorithm_options)) {
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$this->algorithm_options['cost'] = 12;
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}
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}
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public function checkPassword($username, $password)
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{
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$username = Nickname::normalize($username);
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@ -47,30 +74,30 @@ class AuthCryptModule extends AuthenticationModule
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return false;
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}
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// crypt understands what the salt part of $user->password is
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if ($user->password === crypt($password, $user->password)) {
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// and update password hash entry to password_hash() compatible
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if ($this->overwrite) {
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$this->changePassword($user->nickname, null, $password);
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}
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return $user;
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}
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$match = false;
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// If we check StatusNet hash, for backwards compatibility and migration
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if ($this->statusnet && $user->password === md5($password . $user->id)) {
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// and update password hash entry to crypt() compatible
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if ($this->overwrite) {
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$this->changePassword($user->nickname, null, $password);
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}
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return $user;
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}
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// Timing safe password verification on supported PHP versions
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if (password_verify($password, $user->password)) {
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return $user;
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$match = true;
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} elseif ($this->statusnet) {
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// Check StatusNet hash, for backwards compatibility and migration
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// Check size outside regex to take out entries of a differing size faster
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if (strlen($user->password) === 32
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&& preg_match('/^[a-f0-9]$/D', $user->password)) {
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$match = hash_equals(
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$user->password,
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hash('md5', $password . $user->id)
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);
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}
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}
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return false;
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// Update password hash entry if it doesn't match current settings
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if ($this->overwrite
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&& $match
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&& password_needs_rehash($user->password, $this->algorithm, $this->algorithm_options)) {
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$this->changePassword($user->nickname, null, $password);
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}
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return $match ? $user : false;
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}
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// $oldpassword is already verified when calling this function... shouldn't this be private?!
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@ -95,21 +122,7 @@ class AuthCryptModule extends AuthenticationModule
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public function hashPassword($password, ?Profile $profile = null)
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{
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$algorithm = PASSWORD_DEFAULT;
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$options = ['cost' => 12];
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if ($this->argon) {
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$algorithm = PASSWORD_ARGON2I;
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$options = [
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'memory_cost' => PASSWORD_ARGON2_DEFAULT_MEMORY_COST,
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'time_cost' => PASSWORD_ARGON2_DEFAULT_TIME_COST,
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'threads' => PASSWORD_ARGON2_DEFAULT_THREADS,
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];
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}
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// Use the modern password hashing algorithm
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// http://php.net/manual/en/function.password-hash.php
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// Uses PASSWORD_BCRYPT by default, with PASSWORD_ARGON2I being the next possible default in future versions
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return password_hash($password, $algorithm, $options);
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return password_hash($password, $this->algorithm, $this->algorithm_options);
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}
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// EVENTS
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@ -6,12 +6,14 @@ You can change these settings in `config.php` with `$config['AuthCryptModule'][{
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Default values in parenthesis.
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authoritative (false): Set this to true when _all_ passwords are hashed with crypt()
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authoritative (false): Set this to true when _all_ passwords are hashed with password_hash()
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(warning: this may disable all other password verification, also when changing passwords!)
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algorithm (PASSWORD_DEFAULT): A hashing algorithm to use, the default value is defined by PHP. See all supported strings at https://php.net/password-hash
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algorithm_options (['cost' => 12] if "algorithm" is bcrypt): Hashing algorithm options. See all supported values at https://php.net/password-hash
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statusnet (true): Do we check the password against legacy StatusNet md5 hash?
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(notice: will check password login against old-style hash and if 'overwrite' is enabled update using crypt())
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overwrite (true): Do we overwrite old style password hashes with crypt() hashes on password change?
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(notice: to make use of stronger security or migrate to crypt() hashes, this must be true)
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overwrite (true): Do we overwrite password hashes on login if they used a different algorithm
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(notice: to make use of stronger security or migrate obsolete hashes, this must be true)
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password_changeable (true): Enables or disables password changing.
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(notice: if combined with authoritative, it disables changing passwords and removes option from menu.)
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autoregistration: This setting is ignored. Password can never be valid without existing User.
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