cacti/include/global.php

<?php
/*
 +-------------------------------------------------------------------------+
 | Copyright (C) 2004-2022 The Cacti Group                                 |
 |                                                                         |
 | This program is free software; you can redistribute it and/or           |
 | modify it under the terms of the GNU General Public License             |
 | as published by the Free Software Foundation; either version 2          |
 | of the License, or (at your option) any later version.                  |
 |                                                                         |
 | This program is distributed in the hope that it will be useful,         |
 | but WITHOUT ANY WARRANTY; without even the implied warranty of          |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           |
 | GNU General Public License for more details.                            |
 +-------------------------------------------------------------------------+
 | Cacti: The Complete RRDtool-based Graphing Solution                     |
 +-------------------------------------------------------------------------+
 | This code is designed, written, and maintained by the Cacti Group. See  |
 | about.php and/or the AUTHORS file for specific developer information.   |
 +-------------------------------------------------------------------------+
 | http://www.cacti.net/                                                   |
 +-------------------------------------------------------------------------+
*/

/*
   !!! IMPORTANT !!!

   The following defaults are not to be altered.  Please refer to
   include/config.php for user configurable settings.

*/

/* load cacti version from file */
$cacti_version_file = dirname(__FILE__) . '/cacti_version';

if (! file_exists($cacti_version_file)) {
	die ('ERROR: failed to find cacti version file');
}

$cacti_version = file_get_contents($cacti_version_file, false);
if ($cacti_version === false) {
	die ('ERROR: failed to load cacti version file');
}
$cacti_version = trim($cacti_version);

/* define cacti version */
define('CACTI_VERSION', $cacti_version);
#define('CACTI_VERSION_BETA', 1);

/* define if cacti is in CLI mode */
define('CACTI_CLI', (php_sapi_name() == 'cli'));
if (defined('CACTI_CLI_ONLY') && !CACTI_CLI) {
	die('<br><strong>This script is only meant to run at the command line.</strong>');
}

// define documentation table of contents
define('CACTI_DOCUMENTATION_TOC', 'docs/Table-of-Contents.html');

/* Default database settings*/
$database_type     = 'mysql';
$database_default  = 'cacti';
$database_hostname = 'localhost';
$database_username = 'cactiuser';
$database_password = 'cactiuser';
$database_port     = '3306';
$database_retries  = 2;

$database_ssl      = false;
$database_ssl_key  = '';
$database_ssl_cert = '';
$database_ssl_ca   = '';
$database_persist  = true;

/* Default session name - Session name must contain alpha characters */
$cacti_session_name = 'Cacti';

/* define default url path */
$url_path = '/cacti/';

/* disable log rotation setting */
$disable_log_rotation = false;

$config = array();

/* Include configuration, or use the defaults */
if (file_exists(dirname(__FILE__) . '/config.php')) {
	if (!is_readable(dirname(__FILE__) . '/config.php')) {
		die('Configuration file include/config.php is present, but unreadable.' . PHP_EOL);
	}
	include(dirname(__FILE__) . '/config.php');
}

if (isset($config['cacti_version'])) {
	die('Invalid include/config.php file detected.' . PHP_EOL);
	exit;
}

/* Set the poller_id */
if (isset($poller_id)) {
	$config['poller_id'] = $poller_id;
} else {
	$config['poller_id'] = 1;
}

$db_var_defaults = array(
	'database_type'     => 'mysql',
	'database_default'  => NULL,
	'database_hostname' => NULL,
	'database_username' => NULL,
	'database_password' => NULL,
	'database_port'     => '3306',
	'database_retries'  => 2,
	'database_ssl'      => false,
	'database_ssl_key'  => '',
	'database_ssl_cert' => '',
	'database_ssl_ca'   => '',
);

$db_var_prefixes = array('');
if ($config['poller_id'] > 1 || isset($rdatabase_hostname)) {
	$db_var_prefixes[] = 'r';
}

$db_missing_vars = '';
foreach ($db_var_prefixes as $db_var_prefix) {
	foreach ($db_var_defaults as $db_var_name => $db_var_default) {
		$db_var_full = $db_var_prefix . $db_var_name;
		if (!isset($$db_var_full)) {
			if ($db_var_default !== NULL) {
				$$db_var_full = $db_var_default;
			} else {
				$db_missing_vars .= (($db_missing_vars == '') ? 'missing ' : ', ') . $db_var_full;
			}
		}
	}
}

if (!empty($db_missing_vars)) {
	die("config.php is $db_missing_vars" . PHP_EOL);
}

if (empty($url_path)) {
	/* define default url path */
	$url_path = '/';
}

/* set the local for international users */
setlocale(LC_CTYPE, 'en_US.UTF-8');

/* Files that do not need http header information - Command line scripts */
$no_http_header_files = array(
	'add_device.php',
	'add_graphs.php',
	'add_perms.php',
	'add_tree.php',
	'boost_rrdupdate.php',
	'cmd.php',
	'cmd_realtime.php',
	'copy_user.php',
	'host_update_template.php',
	'poller_automation.php',
	'poller_boost.php',
	'poller_commands.php',
	'poller_dsstats.php',
	'poller_export.php',
	'poller_graphs_reapply_names.php',
	'poller_maintenance.php',
	'poller_output_empty.php',
	'poller.php',
	'poller_realtime.php',
	'poller_recovery.php',
	'poller_reindex_hosts.php',
	'poller_reports.php',
	'poller_spikekill.php',
	'query_host_cpu.php',
	'query_host_partitions.php',
	'rebuild_poller_cache.php',
	'repair_database.php',
	'script_server.php',
	'snmpagent_mibcachechild.php',
	'snmpagent_mibcache.php',
	'snmpagent_persist.php',
	'sql.php',
	'ss_host_cpu.php',
	'ss_host_disk.php',
	'ss_sql.php',
	'structure_rra_paths.php',
);

$colors = array();

/* this should be auto-detected, set it manually if needed */
$config['cacti_server_os'] = (strstr(PHP_OS, 'WIN')) ? 'win32' : 'unix';

if (!empty($path_csrf_secret)) {
	$config['path_csrf_secret'] = $path_csrf_secret;
}

/* built-in snmp support */
if ((isset($php_snmp_support) && $php_snmp_support == false) || !function_exists('snmpget')) {
	$config['php_snmp_support'] = false;
} else {
	$config['php_snmp_support'] = class_exists('SNMP');
}

/* PHP binary location */
if (isset($php_path)) {
	$config['php_path'] = $php_path;
}

/* Set various debug fields */
$config['DEBUG_READ_CONFIG_OPTION']         = defined('DEBUG_READ_CONFIG_OPTION');
$config['DEBUG_READ_CONFIG_OPTION_DB_OPEN'] = defined('DEBUG_READ_CONFIG_OPTION_DB_OPEN');
$config['DEBUG_SQL_CMD']                    = defined('DEBUG_SQL_CMD');
$config['DEBUG_SQL_FLOW']                   = defined('DEBUG_SQL_FLOW');

/* check for an empty database port */
if (empty($database_port)) {
	$database_port = '3306';
}

/* set URL path */
if (!isset($url_path)) {
	$url_path = '';
}
$config['url_path'] = $url_path;
define('URL_PATH', $url_path);

/* used for includes */
if ($config['cacti_server_os'] == 'win32') {
	$config['base_path']    = str_replace("\\", "/", substr(dirname(__FILE__),0,-8));
	$config['library_path'] = $config['base_path'] . '/lib';
} else {
	$config['base_path']    = preg_replace("/(.*)[\/]include/", "\\1", dirname(__FILE__));
	$config['library_path'] = preg_replace("/(.*[\/])include/", "\\1lib", dirname(__FILE__));
}
$config['include_path'] = dirname(__FILE__);
$config['rra_path'] = $config['base_path'] . '/rra';

/* for multiple pollers, we need to know this location */
if (!isset($scripts_path)) {
	$config['scripts_path'] = $config['base_path'] . '/scripts';
} else {
	$config['scripts_path'] = $scripts_path;
}

if (!isset($resource_path)) {
	$config['resource_path'] = $config['base_path'] . '/resource';
} else {
	$config['resource_path'] = $resource_path;
}

if (isset($input_whitelist)) {
	$config['input_whitelist'] = $input_whitelist;
}

/* include base modules */
include_once($config['library_path'] . '/database.php');
include_once($config['library_path'] . '/functions.php');
include_once($config['include_path'] . '/global_constants.php');
include_once($config['library_path'] . '/html.php');
include_once($config['library_path'] . '/html_utility.php');
include_once($config['library_path'] . '/html_validate.php');

$filename = get_current_page();

$config['is_web'] = !defined('CACTI_CLI_ONLY');
if ((isset($no_http_headers) && $no_http_headers == true) || in_array($filename, $no_http_header_files, true)) {
	$config['is_web'] = false;
}

/* set poller mode */
global $local_db_cnn_id, $remote_db_cnn_id;

$config['connection'] = 'online';

if ($config['poller_id'] > 1 || isset($rdatabase_hostname)) {
	$local_db_cnn_id = db_connect_real($database_hostname, $database_username, $database_password, $database_default, $database_type, $database_port, $database_retries, $database_ssl, $database_ssl_key, $database_ssl_cert, $database_ssl_ca);

	if (!isset($rdatabase_retries))  $rdatabase_retries  = 2;
	if (!isset($rdatabase_ssl))      $rdatabase_ssl      = false;
	if (!isset($rdatabase_ssl_key))  $rdatabase_ssl_key  = false;
	if (!isset($rdatabase_ssl_cert)) $rdatabase_ssl_cert = false;
	if (!isset($rdatabase_ssl_ca))   $rdatabase_ssl_ca   = false;

	// Check for recovery
	if (is_object($local_db_cnn_id)) {
		$boost_records = db_fetch_cell('SELECT COUNT(*)
			FROM poller_output_boost', '', true, $local_db_cnn_id);

		if ($boost_records > 0) {
			$config['connection'] = 'recovery';
		}
	}

	/* gather the existing cactidb version */
	$config['cacti_db_version'] = db_fetch_cell('SELECT cacti FROM version LIMIT 1', false, $local_db_cnn_id);

	// We are a remote poller also try to connect to the remote database
	$remote_db_cnn_id = db_connect_real($rdatabase_hostname, $rdatabase_username, $rdatabase_password, $rdatabase_default, $rdatabase_type, $rdatabase_port, $database_retries, $rdatabase_ssl, $rdatabase_ssl_key, $rdatabase_ssl_cert, $rdatabase_ssl_ca);

	if ($config['is_web'] && is_object($remote_db_cnn_id) &&
		$config['connection'] != 'recovery' &&
		$config['cacti_db_version'] != 'new_install') {

		// Connection worked, so now override the default settings so that it will always utilize the remote connection
		$database_default   = $rdatabase_default;
		$database_hostname  = $rdatabase_hostname;
		$database_username  = $rdatabase_username;
		$database_password  = $rdatabase_password;
		$database_port      = $rdatabase_port;
		$database_ssl       = $rdatabase_ssl;
		$database_ssl_key   = $rdatabase_ssl_key;
		$database_ssl_cert  = $rdatabase_ssl_cert;
		$database_ssl_ca    = $rdatabase_ssl_ca;
	} elseif (is_object($remote_db_cnn_id)) {
		if ($config['connection'] != 'recovery') {
			$config['connection'] = 'online';
		}
	} else {
		$config['connection'] = 'offline';
	}
} else {
	if (!isset($database_ssl))      $database_ssl      = false;
	if (!isset($database_ssl_key))  $database_ssl_key  = false;
	if (!isset($database_ssl_cert)) $database_ssl_cert = false;
	if (!isset($database_ssl_ca))   $database_ssl_ca   = false;

	if (!db_connect_real($database_hostname, $database_username, $database_password, $database_default, $database_type, $database_port, $database_retries, $database_ssl, $database_ssl_key, $database_ssl_cert, $database_ssl_ca)) {
		$ps = $config['is_web'] ? '<p>' : '';
		$sp = $config['is_web'] ? '</p>' : PHP_EOL;
		$ul = $config['is_web'] ? '<ul>' : PHP_EOL;
		$li = $config['is_web'] ? '<li>' : PHP_EOL . '  - ';
		$lu = $config['is_web'] ? '</ul>' : '';
		$il = $config['is_web'] ? '</li>' : '';
		print $ps . 'FATAL: Connection to Cacti database failed. Please ensure: ' . $ul;
		print $li . 'the PHP MySQL module is installed and enabled.' . $il;
		print $li . 'the database is running.' . $il;
		print $li . 'the credentials in config.php are valid.' . $il;
		print $lu . $sp;
		if (isset($_REQUEST['display_db_errors']) && !empty($config['DATABASE_ERROR'])) {
			print $ps . 'The following database errors occurred: ' . $ul;
			foreach ($config['DATABASE_ERROR'] as $e) {
				print $li . $e['Code'] . ': ' . $e['Error'] . $il;
			}
			print $lu . $sp;
		}
		exit;
	} else {
		/* gather the existing cactidb version */
		$config['cacti_db_version'] = db_fetch_cell('SELECT cacti FROM version LIMIT 1');
	}
}

/* check cacti log is available */
$log_filename = cacti_log_file();
if (!is_resource_writable($log_filename)) {
	die('System log file is not available for writing, please enable write access' . PHP_EOL . 'Log: ' . $log_filename . PHP_EOL);
}

/* prime the most popular config settings */
prime_common_config_settings();

if ($config['poller_id'] > 1) {
	$timezone = db_fetch_cell_prepared('SELECT timezone
		FROM poller
		WHERE id = ?',
		array($config['poller_id']));

	if ($timezone != '') {
		db_execute_prepared('SET time_zone = ?', array($timezone));
	}
}

if (isset($cacti_db_session) && $cacti_db_session && db_table_exists('sessions')) {
	include(dirname(__FILE__) . '/session.php');
} else {
	$cacti_db_session = false;
}

if (!defined('IN_CACTI_INSTALL')) {
	set_error_handler('CactiErrorHandler');
	register_shutdown_function('CactiShutdownHandler');
}

/* verify the cacti database is initialized before moving past here */
db_cacti_initialized($config['is_web']);

if ($config['is_web']) {
	if (read_config_option('force_https') == 'on') {
		if (!isset($_SERVER['HTTPS']) && isset($_SERVER['HTTP_HOST']) && isset($_SERVER['REQUEST_URI'])) {
			header('Location: https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] . PHP_EOL . PHP_EOL);
			exit;
		}
	}

	/* set the maximum post size */
	ini_set('post_max_size', '8M');

	/* add additional cookie directives */
	ini_set('session.cookie_httponly', true);
	ini_set('session.cookie_path', $config['url_path']);
	ini_set('session.use_strict_mode', true);

	$options = array(
		'cookie_httponly' => true,
		'cookie_path'     => $config['url_path'],
		'use_strict_mode' => true
	);

	if (isset($cacti_cookie_domain) && $cacti_cookie_domain != '') {
		ini_set('session.cookie_domain', $cacti_cookie_domain);
		$options['cookie_domain'] = $cacti_cookie_domain;
	}

	// SameSite php7.3+ behavior
	if (version_compare(PHP_VERSION, '7.3', '>=')) {
		ini_set('session.cookie_samesite', 'Strict');
		$options['cookie_samesite'] = 'Strict';
	}

	if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
		ini_set('session.cookie_secure', true);
		$options['cookie_secure'] = true;
	}

	$config['cookie_options']     = $options;
	$config['cacti_session_name'] = $cacti_session_name;

	/* we don't want these pages cached */
	header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
	header('X-Frame-Options: SAMEORIGIN');

	/* increased web hardening */
	$script_policy = read_config_option('content_security_policy_script');
	if ($script_policy == 'unsafe-eval') {
		$script_policy = "'$script_policy'";
	} else {
		$script_policy = '';
	}
	$alternates = html_escape(read_config_option('content_security_alternate_sources'));

	header("Content-Security-Policy: default-src *; img-src 'self' $alternates data: blob:; style-src 'self' 'unsafe-inline' $alternates; script-src 'self' $script_policy 'unsafe-inline' $alternates; frame-ancestors 'self'; worker-src 'self' $alternates;");

	/* prevent IE from silently rejects cookies sent from third party sites. */
	header('P3P: CP="CAO PSA OUR"');
	header('Cache-Control: no-store, no-cache, must-revalidate');
	header('Cache-Control: max-age=31536000');

	cacti_session_start();

	/* we never run with magic quotes on */
	if (version_compare(PHP_VERSION, '5.4', '<=')) {
		if (get_magic_quotes_gpc()) {
			$process = array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST);
			foreach ($process as $key => $val) {
				foreach ($val as $k => $v) {
					unset($process[$key][$k]);
					if (is_array($v)) {
						$process[$key][stripslashes($k)] = $v;
						$process[] = &$process[$key][stripslashes($k)];
					} else {
						$process[$key][stripslashes($k)] = stripslashes($v);
					}
				}
			}
			unset($process);
		}
	}

	/* make sure to start only Cacti session at a time */
	if (!isset($_SESSION['cacti_cwd'])) {
		$_SESSION['cacti_cwd'] = $config['base_path'];
	} else {
		if ($_SESSION['cacti_cwd'] != $config['base_path']) {
			cacti_session_destroy();
		}
	}

	/* Sanitize the http referer */
	if (isset($_SERVER['HTTP_REFERER'])) {
		$_SERVER['HTTP_REFERER'] = sanitize_uri($_SERVER['HTTP_REFERER']);
	}
}

/* emulate 'register_globals' = 'off' if turned on */
if ((bool)ini_get('register_globals')) {
	$not_unset = array('_GET', '_POST', '_COOKIE', '_SERVER', '_SESSION', '_ENV', '_FILES', 'database_type', 'database_default', 'database_hostname', 'database_username', 'database_password', 'config', 'colors');

	/* Not only will array_merge give a warning if a parameter is not an array, it will
	* actually fail. So we check if HTTP_SESSION_VARS has been initialised. */
	if (!isset($_SESSION)) {
		$_SESSION = array();
	}

	/* Merge all into one extremely huge array; unset this later */
	$input = array_merge($_GET, $_POST, $_COOKIE, $_SERVER, $_SESSION, $_ENV, $_FILES);

	unset($input['input']);
	unset($input['not_unset']);

	foreach ($input as $var => $val) {
		if (!in_array($var, $not_unset)) {
			unset($$var);
		}
	}

	unset($input);
}

define('CACTI_DATE_TIME_FORMAT', date_time_format());

include_once($config['include_path'] . '/global_languages.php');
include_once($config['library_path'] . '/auth.php');
include_once($config['library_path'] . '/plugins.php');
include_once($config['include_path'] . '/plugins.php');
include_once($config['include_path'] . '/global_arrays.php');
include_once($config['include_path'] . '/global_settings.php');
include_once($config['include_path'] . '/global_form.php');
include_once($config['library_path'] . '/html_form.php');
include_once($config['library_path'] . '/html_filter.php');
include_once($config['library_path'] . '/variables.php');
include_once($config['library_path'] . '/mib_cache.php');
include_once($config['library_path'] . '/poller.php');
include_once($config['library_path'] . '/snmpagent.php');
include_once($config['library_path'] . '/aggregate.php');
include_once($config['library_path'] . '/api_automation.php');
include_once($config['include_path'] . '/csrf.php');

if ($config['is_web']) {
	if (isset_request_var('newtheme')) {
		unset($_SESSION['selected_theme']);
	}

	if (isset_request_var('csrf_timeout')) {
		raise_message('csrf_ptimeout');
	}

	/* check for save actions using GET */
	if (isset_request_var('action')) {
		$action = get_nfilter_request_var('action');

		$bad_actions = array('save', 'update_data', 'changepassword');

		foreach($bad_actions as $bad) {
			if ($action == $bad && !isset($_POST['__csrf_magic'])) {
				cacti_log('WARNING: Attempt to use GET method for POST operations from IP ' . get_client_addr(), false, 'WEBUI');
				exit;
			}
		}
	}

	if (isset($_COOKIE['CactiTimeZone'])) {
		$gmt_offset = $_COOKIE['CactiTimeZone'];

		cacti_time_zone_set($gmt_offset);
	}
}

api_plugin_hook('config_insert');

/* set config cacti_version for plugins */
$config['cacti_version'] = CACTI_VERSION;;