friendica/mod/redir.php

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<?php
/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* 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, either version 3 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 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/>.
*
*/
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use Friendica\App;
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use Friendica\Core\Logger;
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use Friendica\Core\Session;
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use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Model\Profile;
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use Friendica\Network\HTTPClient\Client\HttpClientAccept;
use Friendica\Network\HTTPClient\Client\HttpClientOptions;
use Friendica\Util\Strings;
function redir_init(App $a) {
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if (!Session::isAuthenticated()) {
throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));
}
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$url = $_GET['url'] ?? '';
if (DI::args()->getArgc() > 1 && intval(DI::args()->getArgv()[1])) {
$cid = intval(DI::args()->getArgv()[1]);
} else {
$cid = 0;
}
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// Try magic auth before the legacy stuff
redir_magic($a, $cid, $url);
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if (empty($cid)) {
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throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
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}
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$fields = ['id', 'uid', 'nurl', 'url', 'addr', 'name'];
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$contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => [0, local_user()]]);
if (!DBA::isResult($contact)) {
throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
}
$contact_url = $contact['url'];
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if (!empty($a->getContactId()) && $a->getContactId() == $cid) {
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// Local user is already authenticated.
redir_check_url($contact_url, $url);
$a->redirect($url ?: $contact_url);
}
if ($contact['uid'] == 0 && local_user()) {
// Let's have a look if there is an established connection
// between the public contact we have found and the local user.
$contact = DBA::selectFirst('contact', $fields, ['nurl' => $contact['nurl'], 'uid' => local_user()]);
if (DBA::isResult($contact)) {
$cid = $contact['id'];
}
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if (!empty($a->getContactId()) && $a->getContactId() == $cid) {
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// Local user is already authenticated.
redir_check_url($contact_url, $url);
$target_url = $url ?: $contact_url;
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Logger::info($contact['name'] . " is already authenticated. Redirecting to " . $target_url);
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$a->redirect($target_url);
}
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}
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if (remote_user()) {
$host = substr(DI::baseUrl()->getUrlPath() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : ''), strpos(DI::baseUrl()->getUrlPath(), '://') + 3);
$remotehost = substr($contact['addr'], strpos($contact['addr'], '@') + 1);
// On a local instance we have to check if the local user has already authenticated
// with the local contact. Otherwise the local user would ask the local contact
// for authentification everytime he/she is visiting a profile page of the local
// contact.
if (($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 ?: $contact_url;
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Logger::info($contact['name'] . " is already authenticated. Redirecting to " . $target_url);
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$a->redirect($target_url);
}
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}
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if (empty($url)) {
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throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
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}
// If we don't have a connected contact, redirect with
// the 'zrl' parameter.
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$my_profile = Profile::getMyURL();
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if (!empty($my_profile) && !Strings::compareLink($my_profile, $url)) {
$separator = strpos($url, '?') ? '&' : '?';
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$url .= $separator . 'zrl=' . urlencode($my_profile);
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}
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Logger::info('redirecting to ' . $url);
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$a->redirect($url);
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}
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function redir_magic($a, $cid, $url)
{
$visitor = Profile::getMyURL();
if (!empty($visitor)) {
Logger::info('Got my url', ['visitor' => $visitor]);
}
$contact = DBA::selectFirst('contact', ['url'], ['id' => $cid]);
if (!DBA::isResult($contact)) {
Logger::info('Contact not found', ['id' => $cid]);
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throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
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} else {
$contact_url = $contact['url'];
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redir_check_url($contact_url, $url);
$target_url = $url ?: $contact_url;
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}
$basepath = Contact::getBasepath($contact_url);
// We don't use magic auth when there is no visitor, we are on the same system or we visit our own stuff
if (empty($visitor) || Strings::compareLink($basepath, DI::baseUrl()) || Strings::compareLink($contact_url, $visitor)) {
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Logger::info('Redirecting without magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
DI::app()->redirect($target_url);
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}
// Test for magic auth on the target system
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$serverret = DI::httpClient()->head($basepath . '/magic', [HttpClientOptions::ACCEPT_CONTENT => HttpClientAccept::HTML]);
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if ($serverret->isSuccess()) {
$separator = strpos($target_url, '?') ? '&' : '?';
$target_url .= $separator . 'zrl=' . urlencode($visitor) . '&addr=' . urlencode($contact_url);
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Logger::info('Redirecting with magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
System::externalRedirect($target_url);
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} else {
Logger::info('No magic for contact', ['contact' => $contact_url]);
}
}
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function redir_check_url(string $contact_url, string $url)
{
if (empty($contact_url) || empty($url)) {
return;
}
$url_host = parse_url($url, PHP_URL_HOST);
if (empty($url_host)) {
$url_host = parse_url(DI::baseUrl(), PHP_URL_HOST);
}
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$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.'));
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}