PasswordReset.php

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<?php
use MediaWiki\Auth\AuthManager;
use MediaWiki\Auth\TemporaryPasswordAuthenticationRequest;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;
use MediaWiki\Permissions\PermissionManager;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\LoggerInterface;
use Wikimedia\Rdbms\ILoadBalancer;
 
class PasswordReset implements LoggerAwareInterface {
    use LoggerAwareTrait;
 
    protected $config;
 
    protected $authManager;
 
    protected $permissionManager;
 
    protected $loadBalancer;
 
    private $permissionCache;
 
    public const CONSTRUCTOR_OPTIONS = [
        'AllowRequiringEmailForResets',
        'EnableEmail',
        'PasswordResetRoutes',
    ];
 
    public function __construct(
        $config,
        AuthManager $authManager,
        PermissionManager $permissionManager,
        ILoadBalancer $loadBalancer = null,
        LoggerInterface $logger = null
    ) {
        $this->config = $config;
        $this->authManager = $authManager;
        $this->permissionManager = $permissionManager;
 
        if ( !$loadBalancer ) {
            wfDeprecated( 'Not passing LoadBalancer to ' . __METHOD__, '1.34' );
            $loadBalancer = MediaWikiServices::getInstance()->getDBLoadBalancer();
        }
        $this->loadBalancer = $loadBalancer;
 
        if ( !$logger ) {
            wfDeprecated( 'Not passing LoggerInterface to ' . __METHOD__, '1.34' );
            $logger = LoggerFactory::getInstance( 'authentication' );
        }
        $this->logger = $logger;
 
        $this->permissionCache = new MapCacheLRU( 1 );
    }
 
    public function isAllowed( User $user ) {
        $status = $this->permissionCache->get( $user->getName() );
        if ( !$status ) {
            $resetRoutes = $this->config->get( 'PasswordResetRoutes' );
            $status = StatusValue::newGood();
 
            if ( !is_array( $resetRoutes ) || !in_array( true, $resetRoutes, true ) ) {
                // Maybe password resets are disabled, or there are no allowable routes
                $status = StatusValue::newFatal( 'passwordreset-disabled' );
            } elseif (
                ( $providerStatus = $this->authManager->allowsAuthenticationDataChange(
                    new TemporaryPasswordAuthenticationRequest(), false ) )
                && !$providerStatus->isGood()
            ) {
                // Maybe the external auth plugin won't allow local password changes
                $status = StatusValue::newFatal( 'resetpass_forbidden-reason',
                    $providerStatus->getMessage() );
            } elseif ( !$this->config->get( 'EnableEmail' ) ) {
                // Maybe email features have been disabled
                $status = StatusValue::newFatal( 'passwordreset-emaildisabled' );
            } elseif ( !$this->permissionManager->userHasRight( $user, 'editmyprivateinfo' ) ) {
                // Maybe not all users have permission to change private data
                $status = StatusValue::newFatal( 'badaccess' );
            } elseif ( $this->isBlocked( $user ) ) {
                // Maybe the user is blocked (check this here rather than relying on the parent
                // method as we have a more specific error message to use here and we want to
                // ignore some types of blocks)
                $status = StatusValue::newFatal( 'blocked-mailpassword' );
            }
 
            $this->permissionCache->set( $user->getName(), $status );
        }
 
        return $status;
    }
 
    public function execute(
        User $performingUser, $username = null, $email = null
    ) {
        if ( !$this->isAllowed( $performingUser )->isGood() ) {
            throw new LogicException( 'User ' . $performingUser->getName()
                . ' is not allowed to reset passwords' );
        }
 
        $username = $username ?? '';
        $email = $email ?? '';
 
        $resetRoutes = $this->config->get( 'PasswordResetRoutes' )
            + [ 'username' => false, 'email' => false ];
        if ( $resetRoutes['username'] && $username ) {
            $method = 'username';
            $users = [ $this->lookupUser( $username ) ];
        } elseif ( $resetRoutes['email'] && $email ) {
            if ( !Sanitizer::validateEmail( $email ) ) {
                return StatusValue::newFatal( 'passwordreset-invalidemail' );
            }
            // Only email was provided
            $method = 'email';
            $users = $this->getUsersByEmail( $email );
            $username = null;
            // Remove users whose preference 'requireemail' is on since username was not submitted
            if ( $this->config->get( 'AllowRequiringEmailForResets' ) ) {
                foreach ( $users as $index => $user ) {
                    if ( $user->getBoolOption( 'requireemail' ) ) {
                        unset( $users[$index] );
                    }
                }
            }
        } else {
            // The user didn't supply any data
            return StatusValue::newFatal( 'passwordreset-nodata' );
        }
 
        // Check for hooks (captcha etc), and allow them to modify the users list
        $error = [];
        $data = [
            'Username' => $username,
            // Email gets set to null for backward compatibility
            'Email' => $method === 'email' ? $email : null,
        ];
        if ( !Hooks::run( 'SpecialPasswordResetOnSubmit', [ &$users, $data, &$error ] ) ) {
            return StatusValue::newFatal( Message::newFromSpecifier( $error ) );
        }
        // Use 'reset' since users[ 0 ] might not exist because users with 'requireemail' option
        // turned on might have been unset from users array
        $firstUser = reset( $users ) ?? null;
        $requireEmail = $this->config->get( 'AllowRequiringEmailForResets' )
            && $method === 'username'
            && $firstUser
            && $firstUser->getBoolOption( 'requireemail' );
        if ( $requireEmail ) {
            if ( $email === '' ) {
                return StatusValue::newFatal( 'passwordreset-username-email-required' );
            }
 
            if ( !Sanitizer::validateEmail( $email ) ) {
                return StatusValue::newFatal( 'passwordreset-invalidemail' );
            }
        }
 
        // Check against the rate limiter
        if ( $performingUser->pingLimiter( 'mailpassword' ) ) {
            return StatusValue::newFatal( 'actionthrottledtext' );
        }
 
        if ( !$users ) {
            if ( $method === 'email' ) {
                // Don't reveal whether or not an email address is in use
                return StatusValue::newGood( [] );
            } else {
                return StatusValue::newFatal( 'noname' );
            }
        }
 
        if ( !$firstUser instanceof User || !$firstUser->getId() ) {
            // Don't parse username as wikitext (T67501)
            return StatusValue::newFatal( wfMessage( 'nosuchuser', wfEscapeWikiText( $username ) ) );
        }
 
        // All the users will have the same email address
        if ( !$firstUser->getEmail() ) {
            // This won't be reachable from the email route, so safe to expose the username
            return StatusValue::newFatal( wfMessage( 'noemail',
                wfEscapeWikiText( $firstUser->getName() ) ) );
        }
 
        if ( $requireEmail && $firstUser->getEmail() !== $email ) {
            // Pretend everything's fine to avoid disclosure but do not send email
            return StatusValue::newGood();
        }
 
        // We need to have a valid IP address for the hook, but per T20347, we should
        // send the user's name if they're logged in.
        $ip = $performingUser->getRequest()->getIP();
        if ( !$ip ) {
            return StatusValue::newFatal( 'badipaddress' );
        }
 
        Hooks::run( 'User::mailPasswordInternal', [ &$performingUser, &$ip, &$firstUser ] );
 
        $result = StatusValue::newGood();
        $reqs = [];
        foreach ( $users as $user ) {
            $req = TemporaryPasswordAuthenticationRequest::newRandom();
            $req->username = $user->getName();
            $req->mailpassword = true;
            $req->caller = $performingUser->getName();
            $status = $this->authManager->allowsAuthenticationDataChange( $req, true );
            if ( $status->isGood() && $status->getValue() !== 'ignored' ) {
                $reqs[] = $req;
            } elseif ( $result->isGood() ) {
                // only record the first error, to avoid exposing the number of users having the
                // same email address
                if ( $status->getValue() === 'ignored' ) {
                    $status = StatusValue::newFatal( 'passwordreset-ignored' );
                }
                $result->merge( $status );
            }
        }
 
        $logContext = [
            'requestingIp' => $ip,
            'requestingUser' => $performingUser->getName(),
            'targetUsername' => $username,
            'targetEmail' => $email,
            'actualUser' => $firstUser->getName(),
        ];
 
        if ( !$result->isGood() ) {
            $this->logger->info(
                "{requestingUser} attempted password reset of {actualUser} but failed",
                $logContext + [ 'errors' => $result->getErrors() ]
            );
            return $result;
        }
 
        $passwords = [];
        foreach ( $reqs as $req ) {
            // This is adding a new temporary password, not intentionally changing anything
            // (even though it might technically invalidate an old temporary password).
            $this->authManager->changeAuthenticationData( $req, /* $isAddition */ true );
        }
 
        $this->logger->info(
            "{requestingUser} did password reset of {actualUser}",
            $logContext
        );
 
        return StatusValue::newGood( $passwords );
    }
 
    protected function isBlocked( User $user ) {
        $block = $user->getBlock() ?: $user->getGlobalBlock();
        if ( !$block ) {
            return false;
        }
        return $block->appliesToPasswordReset();
    }
 
    protected function getUsersByEmail( $email ) {
        $userQuery = User::getQueryInfo();
        $res = $this->loadBalancer->getConnectionRef( DB_REPLICA )->select(
            $userQuery['tables'],
            $userQuery['fields'],
            [ 'user_email' => $email ],
            __METHOD__,
            [],
            $userQuery['joins']
        );
 
        if ( !$res ) {
            // Some sort of database error, probably unreachable
            throw new MWException( 'Unknown database error in ' . __METHOD__ );
        }
 
        $users = [];
        foreach ( $res as $row ) {
            $users[] = User::newFromRow( $row );
        }
        return $users;
    }
 
    protected function lookupUser( $username ) {
        return User::newFromName( $username );
    }
}