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Code Issues Releases Wiki Activity

Issue 8714: Make redirects more secure

pull/8720/head
Michael 2020-06-03 05:14:45 +00:00
parent 5630c9f132
commit 1ca804b638
1 changed files with 102 additions and 84 deletions
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56
mod/redir.php
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@ -31,6 +31,9 @@ use Friendica\Util\Network;
use Friendica\Util\Strings;
function redir_init(App $a) {
if (!Session::isAuthenticated()) {
throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));
}
$url = $_GET['url'] ?? '';
$quiet = !empty($_GET['quiet']) ? '&quiet=1' : '';
@ -44,19 +47,21 @@ function redir_init(App $a) {
// Try magic auth before the legacy stuff
redir_magic($a, $cid, $url);
if (!empty($cid)) {
if (empty($cid)) {
throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
}
$fields = ['id', 'uid', 'nurl', 'url', 'addr', 'name', 'network', 'poll', 'issued-id', 'dfrn-id', 'duplex', 'pending'];
$contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => [0, local_user()]]);
if (!DBA::isResult($contact)) {
notice(DI::l10n()->t('Contact not found.'));
DI::baseUrl()->redirect();
throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
}
$contact_url = $contact['url'];
if (!Session::isAuthenticated() // Visitors (not logged in or not remotes) can't authenticate.
|| (!empty($a->contact['id']) && $a->contact['id'] == $cid)) // Local user is already authenticated.
{
if (!empty($a->contact['id']) && $a->contact['id'] == $cid) {
// Local user is already authenticated.
redir_check_url($contact_url, $url);
$a->redirect($url ?: $contact_url);
}
@ -71,6 +76,7 @@ function redir_init(App $a) {
if (!empty($a->contact['id']) && $a->contact['id'] == $cid) {
// Local user is already authenticated.
redir_check_url($contact_url, $url);
$target_url = $url ?: $contact_url;
Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
$a->redirect($target_url);
@ -87,6 +93,7 @@ function redir_init(App $a) {
// contact.
if (($host == $remotehost) && (Session::getRemoteContactID(Session::get('visitor_visiting')) == Session::get('visitor_id'))) {
// Remote user is already authenticated.
redir_check_url($contact_url, $url);
$target_url = $url ?: $contact_url;
Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
$a->redirect($target_url);
@ -118,14 +125,17 @@ function redir_init(App $a) {
System::externalRedirect($contact['poll'] . '?dfrn_id=' . $dfrn_id
. '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest . $quiet);
redir_check_url($contact_url, $url);
$url = $url ?: $contact_url;
}
$url = $url ?: $contact_url;
if (empty($url)) {
throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
}
// If we don't have a connected contact, redirect with
// the 'zrl' parameter.
if (!empty($url)) {
$my_profile = Profile::getMyURL();
if (!empty($my_profile) && !Strings::compareLink($my_profile, $url)) {
@ -138,10 +148,6 @@ function redir_init(App $a) {
$a->redirect($url);
}
notice(DI::l10n()->t('Contact not found.'));
DI::baseUrl()->redirect();
}
function redir_magic($a, $cid, $url)
{
$visitor = Profile::getMyURL();
@ -152,15 +158,10 @@ function redir_magic($a, $cid, $url)
$contact = DBA::selectFirst('contact', ['url'], ['id' => $cid]);
if (!DBA::isResult($contact)) {
Logger::info('Contact not found', ['id' => $cid]);
// Shouldn't happen under normal conditions
notice(DI::l10n()->t('Contact not found.'));
if (!empty($url)) {
System::externalRedirect($url);
} else {
DI::baseUrl()->redirect();
}
throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
} else {
$contact_url = $contact['url'];
redir_check_url($contact_url, $url);
$target_url = $url ?: $contact_url;
}
@ -184,3 +185,20 @@ function redir_magic($a, $cid, $url)
Logger::info('No magic for contact', ['contact' => $contact_url]);
}
}
function redir_check_url(string $contact_url, string $url)
{
if (empty($contact_url) || empty($url)) {
return;
}
$url_host = parse_url($url, PHP_URL_HOST);
$contact_url_host = parse_url($contact_url, PHP_URL_HOST);
if ($url_host == $contact_url_host) {
return;
}
Logger::error('URL check host mismatch', ['contact' => $contact_url, 'url' => $url]);
throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));
}