pam.php

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<?php
global $_PAM_HANDLERS;
$_PAM_HANDLERS = array();

function register_pam_handler($handler, $importance = "sufficient", $policy = "user") {
    global $_PAM_HANDLERS;

    // setup array for this type of pam if not already set
    if (!isset($_PAM_HANDLERS[$policy])) {
        $_PAM_HANDLERS[$policy] = array();
    }

    // @todo remove requirement that $handle be a global function
    if (is_string($handler) && is_callable($handler, true)) {
        $_PAM_HANDLERS[$policy][$handler] = new \stdClass;

        $_PAM_HANDLERS[$policy][$handler]->handler = $handler;
        $_PAM_HANDLERS[$policy][$handler]->importance = strtolower($importance);

        return true;
    }

    return false;
}

function unregister_pam_handler($handler, $policy = "user") {
    global $_PAM_HANDLERS;

    unset($_PAM_HANDLERS[$policy][$handler]);
}