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<?php
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** 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 Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
class CHtmlUrlValidator {
/**
* URL is validated if schema validation is enabled by CSettingsHelper::VALIDATE_URI_SCHEMES parameter.
*
* Relative URL should start with .php file name.
* Absolute URL schema must match the URI schemes comma separated list stored in the DB.
*
* @param string $url URL string to validate.
* @param array $options
* @param bool $options[allow_user_macro] If set to be true, URLs containing user macros will be considered
* as valid.
* @param int $options[allow_inventory_macro] Enables the usage of trigger/host inventory macros:
* - {INVENTORY.URL.A<1-9>}, {INVENTORY.URL.B<1-9>} and
* {INVENTORY.URL.C<1-9>} if set to INVENTORY_URL_MACRO_TRIGGER;
* - {INVENTORY.URL.A}, {INVENTORY.URL.B} and {INVENTORY.URL.C} if
* set to INVENTORY_URL_MACRO_HOST;
* @param bool $options[allow_event_tags_macro] If set to be true, URLs containing {EVENT.TAGS.<ref>} macros will
* be considered as valid.
* @param bool $options[validate_uri_schemes] Parameter allows to overwrite global switch
* CSettingsHelper::VALIDATE_URI_SCHEMES for specific uses.
*
* @return bool
*/
public static function validate(string $url, array $options = []): bool {
$options += [
'allow_user_macro' => true,
'allow_event_tags_macro' => false,
'allow_inventory_macro' => INVENTORY_URL_MACRO_NONE,
'allow_manualinput_macro' => false,
'validate_uri_schemes' => (bool) CSettingsHelper::get(CSettingsHelper::VALIDATE_URI_SCHEMES)
];
if ($options['validate_uri_schemes'] === false) {
return true;
}
if ($options['allow_inventory_macro'] != INVENTORY_URL_MACRO_NONE) {
$parser_options = [
'macros' => ['{INVENTORY.URL.A}', '{INVENTORY.URL.B}', '{INVENTORY.URL.C}'],
'ref_type' => ($options['allow_inventory_macro'] == INVENTORY_URL_MACRO_TRIGGER)
? CMacroParser::REFERENCE_NUMERIC
: CMacroParser::REFERENCE_NONE
];
$macro_parsers = [new CMacroParser($parser_options), new CMacroFunctionParser($parser_options)];
// Macros allowed only at the beginning of $url.
foreach ($macro_parsers as $macro_parser) {
if ($macro_parser->parse($url, 0) != CParser::PARSE_FAIL) {
return true;
}
}
}
$macro_parsers = [];
if ($options['allow_event_tags_macro'] === true) {
$parser_options = [
'macros' => ['{EVENT.TAGS}'],
'ref_type' => CMacroParser::REFERENCE_ALPHANUMERIC
];
array_push($macro_parsers, new CMacroParser($parser_options), new CMacroFunctionParser($parser_options));
}
if ($options['allow_user_macro'] === true) {
array_push($macro_parsers, new CUserMacroParser, new CUserMacroFunctionParser);
}
if ($options['allow_manualinput_macro'] === true) {
$macro_parsers[] = new CMacroParser(['macros' => ['{MANUALINPUT}']]);
}
if ($macro_parsers) {
for ($pos = strpos($url, '{'); $pos !== false; $pos = strpos($url, '{', $pos + 1)) {
foreach ($macro_parsers as $macro_parser) {
if ($macro_parser->parse($url, $pos) != CParser::PARSE_FAIL) {
return true;
}
}
}
}
$url_parts = parse_url(preg_replace('/[\r\n\t]/', '', trim($url, "\x00..\x1F\x20")));
if (!$url_parts) {
return false;
}
if (array_key_exists('scheme', $url_parts)) {
if (!in_array(strtolower($url_parts['scheme']), explode(',', strtolower(CSettingsHelper::get(
CSettingsHelper::URI_VALID_SCHEMES
))))) {
return false;
}
if (array_key_exists('host', $url_parts)) {
return true;
}
return array_key_exists('path', $url_parts) && $url_parts['path'] !== '/';
}
return array_key_exists('path', $url_parts) && $url_parts['path'] !== '';
}
/**
* Verifies that URL will not lead to third party pages.
*
* @param string $url
*
* @return bool
*/
public static function validateSameSite(string $url): bool {
$root_path = __DIR__.'/../../../';
preg_match('/^\/?(?<filename>[a-z0-9_.]+\.php)(\?.*)?$/i', $url, $url_parts);
return array_key_exists('filename', $url_parts) && file_exists($root_path.$url_parts['filename']);
}
}
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