[Web] move /process/login to internal endpoint

data/conf/dovecot/auth/mailcowauth.php

@@ -0,0 +1,54 @@
+<?php
+header('Content-Type: application/json');
+
+$post = trim(file_get_contents('php://input'));
+if ($post) {
+  $post = json_decode($post, true);
+}
+
+$return = array("success" => false, "role" => false);
+if(!isset($post['username']) || !isset($post['password'])){
+  echo json_encode($return); 
+  exit();
+}
+
+require_once('../../../web/inc/vars.inc.php');
+if (file_exists('../../../web/inc/vars.local.inc.php')) {
+  include_once('../../../web/inc/vars.local.inc.php');
+}
+require_once '../../../web/inc/lib/vendor/autoload.php';
+
+// Do not show errors, we log to using error_log
+ini_set('error_reporting', 0);
+// Init database
+//$dsn = $database_type . ':host=' . $database_host . ';dbname=' . $database_name;
+$dsn = $database_type . ":unix_socket=" . $database_sock . ";dbname=" . $database_name;
+$opt = [
+    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    PDO::ATTR_EMULATE_PREPARES   => false,
+];
+try {
+  $pdo = new PDO($dsn, $database_user, $database_pass, $opt);
+}
+catch (PDOException $e) {
+  error_log("MAILCOWAUTH: " . $e . PHP_EOL);
+  http_response_code(501);
+  exit;
+}
+
+// Load core functions first
+require_once 'functions.inc.php';
+require_once 'functions.auth.inc.php';
+require_once 'sessions.inc.php';
+
+// Init Keycloak Provider
+$iam_provider = identity_provider('init');
+
+$result = check_login($post['username'], $post['password'], $post['protocol'], true);
+if ($result) {
+  $return = array("success" => true, "role" => $result);
+}
+
+echo json_encode($return); 
+exit();