569 lines
19 KiB
PHP
569 lines
19 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* Friendship acceptance for DFRN contacts
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*
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* There are two possible entry points and three scenarios.
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*
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* 1. A form was submitted by our user approving a friendship that originated elsewhere.
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* This may also be called from dfrn_request to automatically approve a friendship.
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*
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* 2. We may be the target or other side of the conversation to scenario 1, and will
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* interact with that process on our own user's behalf.
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*
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* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/stable/spec/dfrn2.pdf
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* You also find a graphic which describes the confirmation process at
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* https://github.com/friendica/friendica/blob/stable/spec/dfrn2_contact_confirmation.png
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*/
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use Friendica\App;
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use Friendica\Core\Logger;
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use Friendica\Core\Protocol;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Model\Contact;
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use Friendica\Model\Group;
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use Friendica\Model\Notify\Type;
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use Friendica\Model\User;
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use Friendica\Protocol\Activity;
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use Friendica\Util\Crypto;
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use Friendica\Util\DateTimeFormat;
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use Friendica\Util\Strings;
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use Friendica\Util\XML;
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function dfrn_confirm_post(App $a, $handsfree = null)
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{
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$node = null;
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if (is_array($handsfree)) {
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/*
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* We were called directly from dfrn_request due to automatic friend acceptance.
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* Any $_POST parameters we may require are supplied in the $handsfree array.
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*
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*/
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$node = $handsfree['node'];
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$a->interactive = false; // notice() becomes a no-op since nobody is there to see it
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} elseif ($a->argc > 1) {
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$node = $a->argv[1];
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}
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/*
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* Main entry point. Scenario 1. Our user received a friend request notification (perhaps
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* from another site) and clicked 'Approve'.
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* $POST['source_url'] is not set. If it is, it indicates Scenario 2.
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*
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* We may also have been called directly from dfrn_request ($handsfree != null) due to
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* this being a page type which supports automatic friend acceptance. That is also Scenario 1
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* since we are operating on behalf of our registered user to approve a friendship.
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*/
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if (empty($_POST['source_url'])) {
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$uid = ($handsfree['uid'] ?? 0) ?: local_user();
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if (!$uid) {
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notice(DI::l10n()->t('Permission denied.'));
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return;
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}
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$user = DBA::selectFirst('user', [], ['uid' => $uid]);
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if (!DBA::isResult($user)) {
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notice(DI::l10n()->t('Profile not found.'));
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return;
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}
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// These data elements may come from either the friend request notification form or $handsfree array.
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if (is_array($handsfree)) {
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Logger::log('Confirm in handsfree mode');
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$dfrn_id = $handsfree['dfrn_id'];
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$intro_id = $handsfree['intro_id'];
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$duplex = $handsfree['duplex'];
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$cid = 0;
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$hidden = intval($handsfree['hidden'] ?? 0);
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} else {
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$dfrn_id = Strings::escapeTags(trim($_POST['dfrn_id'] ?? ''));
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$intro_id = intval($_POST['intro_id'] ?? 0);
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$duplex = intval($_POST['duplex'] ?? 0);
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$cid = intval($_POST['contact_id'] ?? 0);
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$hidden = intval($_POST['hidden'] ?? 0);
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}
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/*
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* Ensure that dfrn_id has precedence when we go to find the contact record.
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* We only want to search based on contact id if there is no dfrn_id,
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* e.g. for OStatus network followers.
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*/
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if (strlen($dfrn_id)) {
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$cid = 0;
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}
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Logger::log('Confirming request for dfrn_id (issued) ' . $dfrn_id);
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if ($cid) {
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Logger::log('Confirming follower with contact_id: ' . $cid);
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}
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/*
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* The other person will have been issued an ID when they first requested friendship.
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* Locate their record. At this time, their record will have both pending and blocked set to 1.
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* There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
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*/
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$r = q("SELECT *
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FROM `contact`
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WHERE (
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(`issued-id` != '' AND `issued-id` = '%s')
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OR
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(`id` = %d AND `id` != 0)
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)
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AND `uid` = %d
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AND `duplex` = 0
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LIMIT 1",
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DBA::escape($dfrn_id),
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intval($cid),
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intval($uid)
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);
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if (!DBA::isResult($r)) {
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Logger::log('Contact not found in DB.');
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notice(DI::l10n()->t('Contact not found.'));
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notice(DI::l10n()->t('This may occasionally happen if contact was requested by both persons and it has already been approved.'));
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return;
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}
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$contact = $r[0];
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$contact_id = $contact['id'];
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$relation = $contact['rel'];
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$site_pubkey = $contact['site-pubkey'];
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$dfrn_confirm = $contact['confirm'];
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$aes_allow = $contact['aes_allow'];
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$protocol = $contact['network'];
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/*
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* Generate a key pair for all further communications with this person.
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* We have a keypair for every contact, and a site key for unknown people.
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* This provides a means to carry on relationships with other people if
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* any single key is compromised. It is a robust key. We're much more
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* worried about key leakage than anybody cracking it.
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*/
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$res = Crypto::newKeypair(4096);
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$private_key = $res['prvkey'];
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$public_key = $res['pubkey'];
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// Save the private key. Send them the public key.
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$fields = ['prvkey' => $private_key, 'protocol' => Protocol::DFRN];
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DBA::update('contact', $fields, ['id' => $contact_id]);
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$params = [];
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/*
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* Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
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* site private key (person on the other end can decrypt it with our site public key).
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* Then encrypt our profile URL with the other person's site public key. They can decrypt
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* it with their site private key. If the decryption on the other end fails for either
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* item, it indicates tampering or key failure on at least one site and we will not be
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* able to provide a secure communication pathway.
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*
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* If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
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* or later) then we encrypt the personal public key we send them using AES-256-CBC and a
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* random key which is encrypted with their site public key.
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*/
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$src_aes_key = openssl_random_pseudo_bytes(64);
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$result = '';
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openssl_private_encrypt($dfrn_id, $result, $user['prvkey']);
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$params['dfrn_id'] = bin2hex($result);
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$params['public_key'] = $public_key;
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$my_url = DI::baseUrl() . '/profile/' . $user['nickname'];
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openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
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$params['source_url'] = bin2hex($params['source_url']);
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if ($aes_allow && function_exists('openssl_encrypt')) {
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openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
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$params['aes_key'] = bin2hex($params['aes_key']);
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$params['public_key'] = bin2hex(openssl_encrypt($public_key, 'AES-256-CBC', $src_aes_key));
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}
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$params['dfrn_version'] = DFRN_PROTOCOL_VERSION;
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if ($duplex == 1) {
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$params['duplex'] = 1;
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}
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if ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
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$params['page'] = 1;
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}
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if ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
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$params['page'] = 2;
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}
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Logger::debug('Confirm: posting data', ['confirm' => $dfrn_confirm, 'parameter' => $params]);
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/*
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*
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* POST all this stuff to the other site.
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* Temporarily raise the network timeout to 120 seconds because the default 60
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* doesn't always give the other side quite enough time to decrypt everything.
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*
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*/
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$res = DI::httpRequest()->post($dfrn_confirm, $params, [], 120)->getBody();
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Logger::log(' Confirm: received data: ' . $res, Logger::DATA);
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// Now figure out what they responded. Try to be robust if the remote site is
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// having difficulty and throwing up errors of some kind.
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$leading_junk = substr($res, 0, strpos($res, '<?xml'));
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$res = substr($res, strpos($res, '<?xml'));
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if (!strlen($res)) {
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// No XML at all, this exchange is messed up really bad.
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// We shouldn't proceed, because the xml parser might choke,
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// and $status is going to be zero, which indicates success.
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// We can hardly call this a success.
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notice(DI::l10n()->t('Response from remote site was not understood.'));
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return;
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}
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if (strlen($leading_junk) && DI::config()->get('system', 'debugging')) {
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// This might be more common. Mixed error text and some XML.
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// If we're configured for debugging, show the text. Proceed in either case.
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notice(DI::l10n()->t('Unexpected response from remote site: ') . $leading_junk);
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}
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if (stristr($res, "<status") === false) {
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// wrong xml! stop here!
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Logger::log('Unexpected response posting to ' . $dfrn_confirm);
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notice(DI::l10n()->t('Unexpected response from remote site: ') . EOL . htmlspecialchars($res));
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return;
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}
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$xml = XML::parseString($res);
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$status = (int) $xml->status;
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$message = XML::unescape($xml->message); // human readable text of what may have gone wrong.
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switch ($status) {
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case 0:
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info(DI::l10n()->t("Confirmation completed successfully."));
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break;
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case 1:
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// birthday paradox - generate new dfrn-id and fall through.
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$new_dfrn_id = Strings::getRandomHex();
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q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d",
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DBA::escape($new_dfrn_id),
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intval($contact_id),
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intval($uid)
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);
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case 2:
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notice(DI::l10n()->t("Temporary failure. Please wait and try again."));
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break;
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case 3:
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notice(DI::l10n()->t("Introduction failed or was revoked."));
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break;
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}
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if (strlen($message)) {
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notice(DI::l10n()->t('Remote site reported: ') . $message);
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}
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if (($status == 0) && $intro_id) {
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$intro = DBA::selectFirst('intro', ['note'], ['id' => $intro_id]);
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if (DBA::isResult($intro)) {
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DBA::update('contact', ['reason' => $intro['note']], ['id' => $contact_id]);
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}
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// Success. Delete the notification.
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DBA::delete('intro', ['id' => $intro_id]);
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}
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if ($status != 0) {
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return;
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}
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/*
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* We have now established a relationship with the other site.
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* Let's make our own personal copy of their profile photo so we don't have
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* to always load it from their site.
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*
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* We will also update the contact record with the nature and scope of the relationship.
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*/
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Contact::updateAvatar($contact_id, $contact['photo']);
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Logger::log('dfrn_confirm: confirm - imported photos');
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$new_relation = Contact::FOLLOWER;
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if (($relation == Contact::SHARING) || ($duplex)) {
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$new_relation = Contact::FRIEND;
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}
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if (($relation == Contact::SHARING) && ($duplex)) {
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$duplex = 0;
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}
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$r = q("UPDATE `contact` SET `rel` = %d,
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`name-date` = '%s',
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`uri-date` = '%s',
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`blocked` = 0,
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`pending` = 0,
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`duplex` = %d,
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`hidden` = %d,
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`network` = '%s' WHERE `id` = %d
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",
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intval($new_relation),
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DBA::escape(DateTimeFormat::utcNow()),
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DBA::escape(DateTimeFormat::utcNow()),
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intval($duplex),
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intval($hidden),
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DBA::escape(Protocol::DFRN),
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intval($contact_id)
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);
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// reload contact info
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$contact = DBA::selectFirst('contact', [], ['id' => $contact_id]);
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Group::addMember(User::getDefaultGroup($uid, $contact["network"]), $contact['id']);
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// Let's send our user to the contact editor in case they want to
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// do anything special with this new friend.
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if ($handsfree === null) {
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DI::baseUrl()->redirect('contact/' . intval($contact_id));
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} else {
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return;
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}
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//NOTREACHED
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}
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/*
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* End of Scenario 1. [Local confirmation of remote friend request].
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*
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* Begin Scenario 2. This is the remote response to the above scenario.
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* This will take place on the site that originally initiated the friend request.
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* In the section above where the confirming party makes a POST and
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* retrieves xml status information, they are communicating with the following code.
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*/
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if (!empty($_POST['source_url'])) {
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// We are processing an external confirmation to an introduction created by our user.
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$public_key = $_POST['public_key'] ?? '';
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$dfrn_id = hex2bin($_POST['dfrn_id'] ?? '');
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$source_url = hex2bin($_POST['source_url'] ?? '');
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$aes_key = $_POST['aes_key'] ?? '';
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$duplex = intval($_POST['duplex'] ?? 0);
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$page = intval($_POST['page'] ?? 0);
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$forum = (($page == 1) ? 1 : 0);
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$prv = (($page == 2) ? 1 : 0);
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Logger::notice('requestee contacted', ['node' => $node]);
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Logger::debug('request', ['POST' => $_POST]);
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// If $aes_key is set, both of these items require unpacking from the hex transport encoding.
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if (!empty($aes_key)) {
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$aes_key = hex2bin($aes_key);
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$public_key = hex2bin($public_key);
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}
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// Find our user's account
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$user = DBA::selectFirst('user', [], ['nickname' => $node]);
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if (!DBA::isResult($user)) {
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$message = DI::l10n()->t('No user record found for \'%s\' ', $node);
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System::xmlExit(3, $message); // failure
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// NOTREACHED
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}
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$my_prvkey = $user['prvkey'];
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$local_uid = $user['uid'];
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if (!strstr($my_prvkey, 'PRIVATE KEY')) {
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$message = DI::l10n()->t('Our site encryption key is apparently messed up.');
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System::xmlExit(3, $message);
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}
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// verify everything
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$decrypted_source_url = "";
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openssl_private_decrypt($source_url, $decrypted_source_url, $my_prvkey);
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if (!strlen($decrypted_source_url)) {
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$message = DI::l10n()->t('Empty site URL was provided or URL could not be decrypted by us.');
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System::xmlExit(3, $message);
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// NOTREACHED
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}
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$contact = DBA::selectFirst('contact', [], ['url' => $decrypted_source_url, 'uid' => $local_uid]);
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if (!DBA::isResult($contact)) {
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if (strstr($decrypted_source_url, 'http:')) {
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$newurl = str_replace('http:', 'https:', $decrypted_source_url);
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} else {
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$newurl = str_replace('https:', 'http:', $decrypted_source_url);
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}
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$contact = DBA::selectFirst('contact', [], ['url' => $newurl, 'uid' => $local_uid]);
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if (!DBA::isResult($contact)) {
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// this is either a bogus confirmation (?) or we deleted the original introduction.
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$message = DI::l10n()->t('Contact record was not found for you on our site.');
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System::xmlExit(3, $message);
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return; // NOTREACHED
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}
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}
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$relation = $contact['rel'];
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// Decrypt all this stuff we just received
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$foreign_pubkey = $contact['site-pubkey'];
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$dfrn_record = $contact['id'];
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if (!$foreign_pubkey) {
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$message = DI::l10n()->t('Site public key not available in contact record for URL %s.', $decrypted_source_url);
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System::xmlExit(3, $message);
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}
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$decrypted_dfrn_id = "";
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openssl_public_decrypt($dfrn_id, $decrypted_dfrn_id, $foreign_pubkey);
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if (strlen($aes_key)) {
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$decrypted_aes_key = "";
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openssl_private_decrypt($aes_key, $decrypted_aes_key, $my_prvkey);
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$dfrn_pubkey = openssl_decrypt($public_key, 'AES-256-CBC', $decrypted_aes_key);
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} else {
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$dfrn_pubkey = $public_key;
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}
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if (DBA::exists('contact', ['dfrn-id' => $decrypted_dfrn_id])) {
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$message = DI::l10n()->t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
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System::xmlExit(1, $message); // Birthday paradox - duplicate dfrn-id
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// NOTREACHED
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}
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$r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d",
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DBA::escape($decrypted_dfrn_id),
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DBA::escape($dfrn_pubkey),
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intval($dfrn_record)
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);
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if (!DBA::isResult($r)) {
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$message = DI::l10n()->t('Unable to set your contact credentials on our system.');
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System::xmlExit(3, $message);
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}
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// It's possible that the other person also requested friendship.
|
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// If it is a duplex relationship, ditch the issued-id if one exists.
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|
|
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if ($duplex) {
|
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q("UPDATE `contact` SET `issued-id` = '' WHERE `id` = %d",
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intval($dfrn_record)
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);
|
|
}
|
|
|
|
// We're good but now we have to scrape the profile photo and send notifications.
|
|
$contact = DBA::selectFirst('contact', ['photo'], ['id' => $dfrn_record]);
|
|
if (DBA::isResult($contact)) {
|
|
$photo = $contact['photo'];
|
|
} else {
|
|
$photo = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
|
|
}
|
|
|
|
Contact::updateAvatar($dfrn_record, $photo);
|
|
|
|
Logger::log('dfrn_confirm: request - photos imported');
|
|
|
|
$new_relation = Contact::SHARING;
|
|
|
|
if (($relation == Contact::FOLLOWER) || ($duplex)) {
|
|
$new_relation = Contact::FRIEND;
|
|
}
|
|
|
|
if (($relation == Contact::FOLLOWER) && ($duplex)) {
|
|
$duplex = 0;
|
|
}
|
|
|
|
$r = q("UPDATE `contact` SET
|
|
`rel` = %d,
|
|
`name-date` = '%s',
|
|
`uri-date` = '%s',
|
|
`blocked` = 0,
|
|
`pending` = 0,
|
|
`duplex` = %d,
|
|
`forum` = %d,
|
|
`prv` = %d,
|
|
`network` = '%s' WHERE `id` = %d
|
|
",
|
|
intval($new_relation),
|
|
DBA::escape(DateTimeFormat::utcNow()),
|
|
DBA::escape(DateTimeFormat::utcNow()),
|
|
intval($duplex),
|
|
intval($forum),
|
|
intval($prv),
|
|
DBA::escape(Protocol::DFRN),
|
|
intval($dfrn_record)
|
|
);
|
|
if (!DBA::isResult($r)) { // indicates schema is messed up or total db failure
|
|
$message = DI::l10n()->t('Unable to update your contact profile details on our system');
|
|
System::xmlExit(3, $message);
|
|
}
|
|
|
|
// Otherwise everything seems to have worked and we are almost done. Yay!
|
|
// Send an email notification
|
|
|
|
Logger::log('dfrn_confirm: request: info updated');
|
|
|
|
$combined = null;
|
|
$r = q("SELECT `contact`.*, `user`.*
|
|
FROM `contact`
|
|
LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
|
|
WHERE `contact`.`id` = %d
|
|
LIMIT 1",
|
|
intval($dfrn_record)
|
|
);
|
|
if (DBA::isResult($r)) {
|
|
$combined = $r[0];
|
|
|
|
if ($combined['notify-flags'] & Type::CONFIRM) {
|
|
$mutual = ($new_relation == Contact::FRIEND);
|
|
notification([
|
|
'type' => Type::CONFIRM,
|
|
'notify_flags' => $combined['notify-flags'],
|
|
'language' => $combined['language'],
|
|
'to_name' => $combined['username'],
|
|
'to_email' => $combined['email'],
|
|
'uid' => $combined['uid'],
|
|
'link' => DI::baseUrl() . '/contact/' . $dfrn_record,
|
|
'source_name' => ((strlen(stripslashes($combined['name']))) ? stripslashes($combined['name']) : DI::l10n()->t('[Name Withheld]')),
|
|
'source_link' => $combined['url'],
|
|
'source_photo' => $combined['photo'],
|
|
'verb' => ($mutual ? Activity::FRIEND : Activity::FOLLOW),
|
|
'otype' => 'intro'
|
|
]);
|
|
}
|
|
}
|
|
|
|
System::xmlExit(0); // Success
|
|
return; // NOTREACHED
|
|
////////////////////// End of this scenario ///////////////////////////////////////////////
|
|
}
|
|
|
|
// somebody arrived here by mistake or they are fishing. Send them to the homepage.
|
|
DI::baseUrl()->redirect();
|
|
// NOTREACHED
|
|
}
|