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validate_url: relax requirements for URLs, limit additional port/loopback filtering to fetch_file_contents()

This commit is contained in:
Andrew Dolgov 2020-09-17 20:20:23 +03:00
parent a4525d31b2
commit 4efc3d7b3f
1 changed files with 12 additions and 9 deletions
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21
include/functions.php
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@ -238,7 +238,7 @@
$url = ltrim($url, ' ');
$url = str_replace(' ', '%20', $url);
$url = validate_url($url);
$url = validate_url($url, true);
if (!$url) return false;
@ -350,7 +350,7 @@
$fetch_effective_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
if (!validate_url($fetch_effective_url)) {
if (!validate_url($fetch_effective_url, true)) {
$fetch_last_error = "URL hostname received after redirection failed to validate.";
return false;
@ -443,7 +443,7 @@
$fetch_effective_url = resolve_redirects($url, $timeout ? $timeout : FILE_FETCH_CONNECT_TIMEOUT);
if (!validate_url($fetch_effective_url)) {
if (!validate_url($fetch_effective_url, true)) {
$fetch_last_error = "URL hostname received after redirection failed to validate.";
return false;
@ -1963,7 +1963,8 @@
return $ttrss_version['version'];
}
function validate_url($url) {
// extended filtering involves validation for safe ports and loopback
function validate_url($url, $extended_filtering = false) {
$url = clean($url);
@ -1979,14 +1980,16 @@
if (!$tokens['host'])
return false;
if (!in_array($tokens['port'], [80, 443, '']))
return false;
if (!in_array($tokens['scheme'], ['http', 'https']))
return false;
if ($tokens['host'] == 'localhost' || $tokens['host'] == '::1' || strpos($tokens['host'], '127.') === 0)
return false;
if ($extended_filtering) {
if (!in_array($tokens['port'], [80, 443, '']))
return false;
if ($tokens['host'] == 'localhost' || $tokens['host'] == '::1' || strpos($tokens['host'], '127.') === 0)
return false;
}
//convert IDNA hostname to punycode if possible
if (function_exists("idn_to_ascii")) {