How to expire all wordpress user passwords instantly?

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So I own an article directory website and recently a lot of bots have signed up and started posting spam. (I approve posts prior to publication)

I’ve added a captcha to the user registration page now but for the users that are already registered I want to make their passwords expire so they have to set new ones and obviously the bots won’t be able to do this.

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I’ve tried multiple plugins with no success. I don’t really know what to do. I have over 1800 users so going through them 1 by 1 is not an option.

Would appreciate this a lot!

Thank you!

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  1. Some underlying functionality borrowed from http://wordpress.org/extend/plugins/auto-expire-passwords/ , and tweaked. Untested, but along the lines of what you are looking for, so YMMV.

    function custom_forced_password_reset( $user ) {
    update_user_meta( $user->ID, 'password_was_force_reset', true );
}
add_action( 'password_reset', 'custom_forced_password_reset' );    

// Ensure all new register users have the flag set
function custom_forced_password_user_register($user_id){
    update_user_meta( $user_id, 'password_was_force_reset', true );
}
add_action( 'user_register', 'custom_forced_password_user_register', 10, 1 );

function custom_log_in_check( $user, $username, $password ) {
    if ( is_wp_error( $user ) )
        return $user;

    // Check we're dealing with a WP_User object
    if ( ! is_a( $user, 'WP_User' ) )
        return $user;

    // This is a log in which would normally be succesful
    $user_id = $user->data->ID;


    $reset = get_user_meta( $user_id, 'password_was_force_reset', false );
    if ( empty( $reset ) || $reset == false ) {
            $user = new WP_Error( 'authentication_failed', sprintf('<strong>ERROR</strong>: You must <a href="%s">reset your password</a>.', site_url( 'wp-login.php?action=lostpassword', 'login' ) ) );
    }

    return $user;
}
add_filter( 'authenticate', 'custom_log_in_check', 30, 3 );