3 * @copyright Copyright (C) 2020, Friendica
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 use Friendica\Core\Logger;
24 use Friendica\Core\Protocol;
25 use Friendica\Database\DBA;
27 use Friendica\Model\Contact;
28 use Friendica\Protocol\ActivityNamespace;
29 use Friendica\Protocol\OStatus;
30 use Friendica\Protocol\Salmon;
31 use Friendica\Util\Crypto;
32 use Friendica\Util\Network;
33 use Friendica\Util\Strings;
35 function salmon_post(App $a, $xml = '') {
38 $xml = Network::postdata();
41 Logger::log('new salmon ' . $xml, Logger::DATA);
43 $nick = (($a->argc > 1) ? Strings::escapeTags(trim($a->argv[1])) : '');
45 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
48 if (! DBA::isResult($r)) {
49 throw new \Friendica\Network\HTTPException\InternalServerErrorException();
56 $dom = simplexml_load_string($xml,'SimpleXMLElement',0, ActivityNamespace::SALMON_ME);
60 // figure out where in the DOM tree our data is hiding
61 if (!empty($dom->provenance->data))
62 $base = $dom->provenance;
63 elseif (!empty($dom->env->data))
65 elseif (!empty($dom->data))
69 Logger::log('unable to locate salmon data in xml ');
70 throw new \Friendica\Network\HTTPException\BadRequestException();
73 // Stash the signature away for now. We have to find their key or it won't be good for anything.
76 $signature = Strings::base64UrlDecode($base->sig);
80 // strip whitespace so our data element will return to one big base64 blob
81 $data = str_replace([" ","\t","\r","\n"],["","","",""],$base->data);
83 // stash away some other stuff for later
85 $type = $base->data[0]->attributes()->type[0];
86 $keyhash = $base->sig[0]->attributes()->keyhash[0];
87 $encoding = $base->encoding;
90 // Salmon magic signatures have evolved and there is no way of knowing ahead of time which
91 // flavour we have. We'll try and verify it regardless.
93 $stnet_signed_data = $data;
95 $signed_data = $data . '.' . Strings::base64UrlEncode($type) . '.' . Strings::base64UrlEncode($encoding) . '.' . Strings::base64UrlEncode($alg);
97 $compliant_format = str_replace('=', '', $signed_data);
101 $data = Strings::base64UrlDecode($data);
103 $author = OStatus::salmonAuthor($data, $importer);
104 $author_link = $author["author-link"];
107 Logger::log('Could not retrieve author URI.');
108 throw new \Friendica\Network\HTTPException\BadRequestException();
111 // Once we have the author URI, go to the web and try to find their public key
113 Logger::log('Fetching key for ' . $author_link);
115 $key = Salmon::getKey($author_link, $keyhash);
118 Logger::log('Could not retrieve author key.');
119 throw new \Friendica\Network\HTTPException\BadRequestException();
122 $key_info = explode('.',$key);
124 $m = Strings::base64UrlDecode($key_info[1]);
125 $e = Strings::base64UrlDecode($key_info[2]);
127 Logger::log('key details: ' . print_r($key_info,true), Logger::DEBUG);
129 $pubkey = Crypto::meToPem($m, $e);
131 // We should have everything we need now. Let's see if it verifies.
133 // Try GNU Social format
134 $verify = Crypto::rsaVerify($signed_data, $signature, $pubkey);
138 Logger::log('message did not verify using protocol. Trying compliant format.');
139 $verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
144 Logger::log('message did not verify using padding. Trying old statusnet format.');
145 $verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
150 Logger::log('Message did not verify. Discarding.');
151 throw new \Friendica\Network\HTTPException\BadRequestException();
154 Logger::log('Message verified with mode '.$mode);
159 * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
163 $r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
164 AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
165 AND `uid` = %d LIMIT 1",
166 DBA::escape(Protocol::OSTATUS),
167 DBA::escape(Protocol::DFRN),
168 DBA::escape(Strings::normaliseLink($author_link)),
169 DBA::escape($author_link),
170 DBA::escape(Strings::normaliseLink($author_link)),
171 intval($importer['uid'])
174 if (!DBA::isResult($r)) {
175 Logger::log('Author ' . $author_link . ' unknown to user ' . $importer['uid'] . '.');
177 if (DI::pConfig()->get($importer['uid'], 'system', 'ostatus_autofriend')) {
178 $result = Contact::createFromProbe($importer['uid'], $author_link);
180 if ($result['success']) {
181 $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
182 AND `uid` = %d LIMIT 1",
183 DBA::escape(Protocol::OSTATUS),
184 DBA::escape($author_link),
185 DBA::escape($author_link),
186 intval($importer['uid'])
192 // Have we ignored the person?
193 // If so we can not accept this post.
195 //if((DBA::isResult($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == Contact::FOLLOWER) || ($r[0]['blocked']))) {
196 if (DBA::isResult($r) && $r[0]['blocked']) {
197 Logger::log('Ignoring this author.');
198 throw new \Friendica\Network\HTTPException\AcceptedException();
201 // Placeholder for hub discovery.
204 $contact_rec = ((DBA::isResult($r)) ? $r[0] : []);
206 OStatus::import($data, $importer, $contact_rec, $hub);
208 throw new \Friendica\Network\HTTPException\OKException();