shell bypass 403
<?php
// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause
declare(strict_types=1);
namespace SimplePie;
use SimplePie\HTTP\Response;
/**
* Used for fetching remote files and reading local files
*
* Supports HTTP 1.0 via cURL or fsockopen, with spotty HTTP 1.1 support
*
* This class can be overloaded with {@see \SimplePie\SimplePie::set_file_class()}
*
* @todo Move to properly supporting RFC2616 (HTTP/1.1)
*/
class File implements Response
{
/**
* @var string The final URL after following all redirects
* @deprecated Use `get_final_requested_uri()` method.
*/
public $url;
/**
* @var ?string User agent to use in requests
* @deprecated Set the user agent in constructor.
*/
public $useragent;
/** @var bool */
public $success = true;
/** @var array<string, non-empty-array<string>> Canonical representation of headers */
private $parsed_headers = [];
/** @var array<string, string> Last known value of $headers property (used to detect external modification) */
private $last_headers = [];
/**
* @var array<string, string> Headers as string for BC
* @deprecated Use `get_headers()` method.
*/
public $headers = [];
/**
* @var ?string Body of the HTTP response
* @deprecated Use `get_body_content()` method.
*/
public $body;
/**
* @var int Status code of the HTTP response
* @deprecated Use `get_status_code()` method.
*/
public $status_code = 0;
/** @var non-negative-int Number of redirect that were already performed during this request sequence. */
public $redirects = 0;
/** @var ?string */
public $error;
/**
* @var int-mask-of<SimplePie::FILE_SOURCE_*> Bit mask representing the method used to fetch the file and whether it is a local file or remote file obtained over HTTP.
* @deprecated Backend is implementation detail which you should not care about; to see if the file was retrieved over HTTP, check if `get_final_requested_uri()` with `Misc::is_remote_uri()`.
*/
public $method = \SimplePie\SimplePie::FILE_SOURCE_NONE;
/**
* @var string The permanent URL or the resource (first URL after the prefix of (only) permanent redirects)
* @deprecated Use `get_permanent_uri()` method.
*/
public $permanent_url;
/** @var bool Whether the permanent URL is still writeable (prefix of permanent redirects has not ended) */
private $permanentUrlMutable = true;
/**
* @param string $url
* @param int $timeout
* @param int $redirects
* @param ?array<string, string> $headers
* @param ?string $useragent
* @param bool $force_fsockopen
* @param array<int, mixed> $curl_options
*/
public function __construct(string $url, int $timeout = 10, int $redirects = 5, ?array $headers = null, ?string $useragent = null, bool $force_fsockopen = false, array $curl_options = [])
{
if (function_exists('idn_to_ascii')) {
$parsed = \SimplePie\Misc::parse_url($url);
if ($parsed['authority'] !== '' && !ctype_print($parsed['authority'])) {
$authority = (string) \idn_to_ascii($parsed['authority'], \IDNA_NONTRANSITIONAL_TO_ASCII, \INTL_IDNA_VARIANT_UTS46);
$url = \SimplePie\Misc::compress_parse_url($parsed['scheme'], $authority, $parsed['path'], $parsed['query'], null);
}
}
$this->url = $url;
if ($this->permanentUrlMutable) {
$this->permanent_url = $url;
}
$this->useragent = $useragent;
if (preg_match('/^http(s)?:\/\//i', $url)) {
if ($useragent === null) {
$useragent = (string) ini_get('user_agent');
$this->useragent = $useragent;
}
if (!is_array($headers)) {
$headers = [];
}
if (!$force_fsockopen && function_exists('curl_exec')) {
$this->method = \SimplePie\SimplePie::FILE_SOURCE_REMOTE | \SimplePie\SimplePie::FILE_SOURCE_CURL;
$fp = curl_init();
$headers2 = [];
foreach ($headers as $key => $value) {
$headers2[] = "$key: $value";
}
if (isset($curl_options[CURLOPT_HTTPHEADER])) {
if (is_array($curl_options[CURLOPT_HTTPHEADER])) {
$headers2 = array_merge($headers2, $curl_options[CURLOPT_HTTPHEADER]);
}
unset($curl_options[CURLOPT_HTTPHEADER]);
}
if (version_compare(\SimplePie\Misc::get_curl_version(), '7.10.5', '>=')) {
curl_setopt($fp, CURLOPT_ENCODING, '');
}
curl_setopt($fp, CURLOPT_URL, $url);
curl_setopt($fp, CURLOPT_HEADER, 1);
curl_setopt($fp, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($fp, CURLOPT_FAILONERROR, 1);
curl_setopt($fp, CURLOPT_TIMEOUT, $timeout);
curl_setopt($fp, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt($fp, CURLOPT_REFERER, \SimplePie\Misc::url_remove_credentials($url));
curl_setopt($fp, CURLOPT_USERAGENT, $useragent);
curl_setopt($fp, CURLOPT_HTTPHEADER, $headers2);
foreach ($curl_options as $curl_param => $curl_value) {
curl_setopt($fp, $curl_param, $curl_value);
}
$responseHeaders = curl_exec($fp);
if (curl_errno($fp) === CURLE_WRITE_ERROR || curl_errno($fp) === CURLE_BAD_CONTENT_ENCODING) {
curl_setopt($fp, CURLOPT_ENCODING, 'none');
$responseHeaders = curl_exec($fp);
}
$this->status_code = curl_getinfo($fp, CURLINFO_HTTP_CODE);
if (curl_errno($fp)) {
$this->error = 'cURL error ' . curl_errno($fp) . ': ' . curl_error($fp);
$this->success = false;
} else {
// Use the updated url provided by curl_getinfo after any redirects.
if ($info = curl_getinfo($fp)) {
$this->url = $info['url'];
}
// For PHPStan: We already checked that error did not occur.
assert(is_array($info) && $info['redirect_count'] >= 0);
if (\PHP_VERSION_ID < 80000) {
curl_close($fp);
}
$responseHeaders = \SimplePie\HTTP\Parser::prepareHeaders((string) $responseHeaders, $info['redirect_count'] + 1);
$parser = new \SimplePie\HTTP\Parser($responseHeaders, true);
if ($parser->parse()) {
$this->set_headers($parser->headers);
$this->body = $parser->body;
$this->status_code = $parser->status_code;
if ((in_array($this->status_code, [300, 301, 302, 303, 307]) || $this->status_code > 307 && $this->status_code < 400) && ($locationHeader = $this->get_header_line('location')) !== '' && $this->redirects < $redirects) {
$this->redirects++;
$location = \SimplePie\Misc::absolutize_url($locationHeader, $url);
if ($location === false) {
$this->error = "Invalid redirect location, trying to base “{$locationHeader}” onto “{$url}”";
$this->success = false;
return;
}
$this->permanentUrlMutable = $this->permanentUrlMutable && ($this->status_code == 301 || $this->status_code == 308);
$this->__construct($location, $timeout, $redirects, $headers, $useragent, $force_fsockopen, $curl_options);
return;
}
}
}
} else {
$this->method = \SimplePie\SimplePie::FILE_SOURCE_REMOTE | \SimplePie\SimplePie::FILE_SOURCE_FSOCKOPEN;
if (($url_parts = parse_url($url)) === false) {
throw new \InvalidArgumentException('Malformed URL: ' . $url);
}
if (!isset($url_parts['host'])) {
throw new \InvalidArgumentException('Missing hostname: ' . $url);
}
$socket_host = $url_parts['host'];
if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') {
$socket_host = 'ssl://' . $socket_host;
$url_parts['port'] = 443;
}
if (!isset($url_parts['port'])) {
$url_parts['port'] = 80;
}
$fp = @fsockopen($socket_host, $url_parts['port'], $errno, $errstr, $timeout);
if (!$fp) {
$this->error = 'fsockopen error: ' . $errstr;
$this->success = false;
} else {
stream_set_timeout($fp, $timeout);
if (isset($url_parts['path'])) {
if (isset($url_parts['query'])) {
$get = "$url_parts[path]?$url_parts[query]";
} else {
$get = $url_parts['path'];
}
} else {
$get = '/';
}
$out = "GET $get HTTP/1.1\r\n";
$out .= "Host: $url_parts[host]\r\n";
$out .= "User-Agent: $useragent\r\n";
if (extension_loaded('zlib')) {
$out .= "Accept-Encoding: x-gzip,gzip,deflate\r\n";
}
if (isset($url_parts['user']) && isset($url_parts['pass'])) {
$out .= "Authorization: Basic " . base64_encode("$url_parts[user]:$url_parts[pass]") . "\r\n";
}
foreach ($headers as $key => $value) {
$out .= "$key: $value\r\n";
}
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
$info = stream_get_meta_data($fp);
$responseHeaders = '';
while (!$info['eof'] && !$info['timed_out']) {
$responseHeaders .= fread($fp, 1160);
$info = stream_get_meta_data($fp);
}
if (!$info['timed_out']) {
$parser = new \SimplePie\HTTP\Parser($responseHeaders, true);
if ($parser->parse()) {
$this->set_headers($parser->headers);
$this->body = $parser->body;
$this->status_code = $parser->status_code;
if ((in_array($this->status_code, [300, 301, 302, 303, 307]) || $this->status_code > 307 && $this->status_code < 400) && ($locationHeader = $this->get_header_line('location')) !== '' && $this->redirects < $redirects) {
$this->redirects++;
$location = \SimplePie\Misc::absolutize_url($locationHeader, $url);
$this->permanentUrlMutable = $this->permanentUrlMutable && ($this->status_code == 301 || $this->status_code == 308);
if ($location === false) {
$this->error = "Invalid redirect location, trying to base “{$locationHeader}” onto “{$url}”";
$this->success = false;
return;
}
$this->__construct($location, $timeout, $redirects, $headers, $useragent, $force_fsockopen, $curl_options);
return;
}
if (($contentEncodingHeader = $this->get_header_line('content-encoding')) !== '') {
// Hey, we act dumb elsewhere, so let's do that here too
switch (strtolower(trim($contentEncodingHeader, "\x09\x0A\x0D\x20"))) {
case 'gzip':
case 'x-gzip':
if (($decompressed = gzdecode($this->body)) === false) {
$this->error = 'Unable to decode HTTP "gzip" stream';
$this->success = false;
} else {
$this->body = $decompressed;
}
break;
case 'deflate':
if (($decompressed = gzinflate($this->body)) !== false) {
$this->body = $decompressed;
} elseif (($decompressed = gzuncompress($this->body)) !== false) {
$this->body = $decompressed;
} elseif (($decompressed = gzdecode($this->body)) !== false) {
$this->body = $decompressed;
} else {
$this->error = 'Unable to decode HTTP "deflate" stream';
$this->success = false;
}
break;
default:
$this->error = 'Unknown content coding';
$this->success = false;
}
}
}
} else {
$this->error = 'fsocket timed out';
$this->success = false;
}
fclose($fp);
}
}
} else {
$this->method = \SimplePie\SimplePie::FILE_SOURCE_LOCAL | \SimplePie\SimplePie::FILE_SOURCE_FILE_GET_CONTENTS;
if (empty($url) || !is_readable($url) || false === $filebody = file_get_contents($url)) {
$this->body = '';
$this->error = sprintf('file "%s" is not readable', $url);
$this->success = false;
} else {
$this->body = $filebody;
$this->status_code = 200;
}
}
if ($this->success) {
assert($this->body !== null); // For PHPStan
// Leading whitespace may cause XML parsing errors (XML declaration cannot be preceded by anything other than BOM) so we trim it.
// Note that unlike built-in `trim` function’s default settings, we do not trim `\x00` to avoid breaking characters in UTF-16 or UTF-32 encoded strings.
// We also only do that when the whitespace is followed by `<`, so that we do not break e.g. UTF-16LE encoded whitespace like `\n\x00` in half.
$this->body = preg_replace('/^[ \n\r\t\v]+</', '<', $this->body);
}
}
public function get_permanent_uri(): string
{
return (string) $this->permanent_url;
}
public function get_final_requested_uri(): string
{
return (string) $this->url;
}
public function get_status_code(): int
{
return (int) $this->status_code;
}
public function get_headers(): array
{
$this->maybe_update_headers();
return $this->parsed_headers;
}
public function has_header(string $name): bool
{
$this->maybe_update_headers();
return $this->get_header($name) !== [];
}
public function get_header(string $name): array
{
$this->maybe_update_headers();
return $this->parsed_headers[strtolower($name)] ?? [];
}
public function with_header(string $name, $value)
{
$this->maybe_update_headers();
$new = clone $this;
$newHeader = [
strtolower($name) => (array) $value,
];
$new->set_headers($newHeader + $this->get_headers());
return $new;
}
public function get_header_line(string $name): string
{
$this->maybe_update_headers();
return implode(', ', $this->get_header($name));
}
public function get_body_content(): string
{
return (string) $this->body;
}
/**
* Check if the $headers property was changed and update the internal state accordingly.
*/
private function maybe_update_headers(): void
{
if ($this->headers !== $this->last_headers) {
$this->parsed_headers = array_map(
function (string $header_line): array {
if (strpos($header_line, ',') === false) {
return [$header_line];
} else {
return array_map('trim', explode(',', $header_line));
}
},
$this->headers
);
}
$this->last_headers = $this->headers;
}
/**
* Sets headers internally.
*
* @param array<string, non-empty-array<string>> $headers
*/
private function set_headers(array $headers): void
{
$this->parsed_headers = $headers;
$this->headers = self::flatten_headers($headers);
$this->last_headers = $this->headers;
}
/**
* Converts PSR-7 compatible headers into a legacy format.
*
* @param array<string, non-empty-array<string>> $headers
*
* @return array<string, string>
*/
private function flatten_headers(array $headers): array
{
return array_map(function (array $values): string {
return implode(',', $values);
}, $headers);
}
/**
* Create a File instance from another Response
*
* For BC reasons in some places there MUST be a `File` instance
* instead of a `Response` implementation
*
* @see Locator::__construct()
* @internal
*/
final public static function fromResponse(Response $response): self
{
$headers = [];
foreach ($response->get_headers() as $name => $header) {
$headers[$name] = implode(', ', $header);
}
/** @var File */
$file = (new \ReflectionClass(File::class))->newInstanceWithoutConstructor();
$file->url = $response->get_final_requested_uri();
$file->useragent = null;
$file->headers = $headers;
$file->body = $response->get_body_content();
$file->status_code = $response->get_status_code();
$file->permanent_url = $response->get_permanent_uri();
return $file;
}
}
class_alias('SimplePie\File', 'SimplePie_File');