get_baseurl(), strpos($a->get_baseurl(),'://') + 3); $padded_data = pkcs5_pad($msg,16); $inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv); $b64_data = base64_encode($inner_encrypted); $b64url_data = base64url_encode($b64_data); $b64url_stripped = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data); $lines = str_split($b64url_stripped,60); $data = implode("\n",$lines); $data = $data . (($data[-1] != "\n") ? "\n" : '') ; $type = 'application/atom+xml'; $encoding = 'base64url'; $alg = 'RSA-SHA256'; $signable_data = $data . '.' . base64url_encode($type) . "\n" . '.' . base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n"; $signature = rsa_sign($signable_data,$prvkey); $sig = base64url_encode($signature); $decrypted_header = <<< EOT $b_inner_iv $b_inner_aes_key {$user['username']} $handle EOT; $decrypted_header = pkcs5_pad($decrypted_header,16); $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv); $outer_json = json_encode(array('iv' => $b_outer_iv,'key' => $b_outer_aes_key)); $encrypted_outer_key_bundle = ''; openssl_public_encrypt($outer_json,$encrypted_outer_key_bundle,$pubkey); $b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle); $encrypted_header_json_object = json_encode(array('aes_key' => base64_encode($encrypted_outer_key_bundle), 'ciphertext' => base64_encode($ciphertext))); $encrypted_header = '' . base64_encode($encrypted_header_json_object) . ''; $magic_env = <<< EOT $encrypted_header base64url RSA-SHA256 $data $sig EOT; return $magic_env; } /** * * diaspora_decode($importer,$xml) * array $importer -> from user table * string $xml -> urldecoded Diaspora salmon * * Returns array * 'message' -> decoded Diaspora XML message * 'author' -> author diaspora handle * 'key' -> author public key (converted to pkcs#8) * * Author and key are used elsewhere to save a lookup for verifying replies and likes */ function diaspora_decode($importer,$xml) { $basedom = parse_xml_string($xml); $atom = $basedom->children(NAMESPACE_ATOM1); // Diaspora devs: This is kind of sucky - 'encrypted_header' does not belong in the atom namespace $encrypted_header = json_decode(base64_decode($atom->encrypted_header)); $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key); $ciphertext = base64_decode($encrypted_header->ciphertext); $outer_key_bundle = ''; openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']); $j_outer_key_bundle = json_decode($outer_key_bundle); $outer_iv = base64_decode($j_outer_key_bundle->iv); $outer_key = base64_decode($j_outer_key_bundle->key); $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv); $decrypted = pkcs5_unpad($decrypted); /** * $decrypted now contains something like * * * 8e+G2+ET8l5BPuW0sVTnQw== * UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU= * * Ryan Hughes * acct:galaxor@diaspora.pirateship.org * * */ logger('decrypted: ' . $decrypted); $idom = parse_xml_string($decrypted,false); $inner_iv = base64_decode($idom->iv); $inner_aes_key = base64_decode($idom->aes_key); $author_link = str_replace('acct:','',$idom->author->uri); $dom = $basedom->children(NAMESPACE_SALMON_ME); // figure out where in the DOM tree our data is hiding if($dom->provenance->data) $base = $dom->provenance; elseif($dom->env->data) $base = $dom->env; elseif($dom->data) $base = $dom; if(! $base) { logger('mod-diaspora: unable to locate salmon data in xml '); http_status_exit(400); } // Stash the signature away for now. We have to find their key or it won't be good for anything. $signature = base64url_decode($base->sig); // unpack the data // strip whitespace so our data element will return to one big base64 blob $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data); // Add back the 60 char linefeeds // Diaspora devs: This completely violates the entire principle of salmon magic signatures, // which was to have a message signing format that was completely ambivalent to linefeeds // and transport whitespace mangling, and base64 wrapping rules. Guess what? PHP and Ruby // use different linelengths for base64 output. $lines = str_split($data,60); $data = implode("\n",$lines); // stash away some other stuff for later $type = $base->data[0]->attributes()->type[0]; $keyhash = $base->sig[0]->attributes()->keyhash[0]; $encoding = $base->encoding; $alg = $base->alg; // Diaspora devs: I can't even begin to tell you how sucky this is. Read the freaking spec. $signed_data = $data . (($data[-1] != "\n") ? "\n" : '') . '.' . base64url_encode($type) . "\n" . '.' . base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n"; // decode the data $data = base64url_decode($data); // Now pull out the inner encrypted blob $inner_encrypted = base64_decode($data); $inner_decrypted = $inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv); $inner_decrypted = pkcs5_unpad($inner_decrypted); if(! $author_link) { logger('mod-diaspora: Could not retrieve author URI.'); http_status_exit(400); } // Once we have the author URI, go to the web and try to find their public key // *** or look it up locally *** logger('mod-diaspora: Fetching key for ' . $author_link ); // Get diaspora public key (pkcs#1) and convert to pkcs#8 $key = get_diaspora_key($author_link); if(! $key) { logger('mod-diaspora: Could not retrieve author key.'); http_status_exit(400); } $verify = rsa_verify($signed_data,$signature,$key); if(! $verify) { logger('mod-diaspora: Message did not verify. Discarding.'); http_status_exit(400); } logger('mod-diaspora: Message verified.'); return array('message' => $inner_decrypted, 'author' => $author_link, 'key' => $key); } function diaspora_get_contact_by_handle($uid,$handle) { $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND `uid` = %d AND `addr` = '%s' LIMIT 1", dbesc(NETWORK_DIASPORA), intval($uid), dbesc($handle) ); if($r && count($r)) return $r[0]; return false; } function find_person_by_handle($handle) { // we don't care about the uid, we just want to save an expensive webfinger probe $r = q("select * from contact where network = '%s' and addr = '%s' LIMIT 1", dbesc(NETWORK_DIASPORA), dbesc($handle) ); if(count($r)) return $r[0]; $r = probe_url($handle); // need to cached this, perhaps in fcontact if(count($r)) return ($r); return false; } function diaspora_request($importer,$xml) { $sender_handle = unxmlify($xml->sender_handle); $recipient_handle = unxmlify($xml->recipient_handle); if(! $sender_handle || ! $recipient_handle) return; $contact = diaspora_get_contact_by_handle($importer['uid'],$sender_handle); if($contact) { // perhaps we were already sharing with this person. Now they're sharing with us. // That makes us friends. if($contact['rel'] == CONTACT_IS_FOLLOWER) { q("UPDATE `contact` SET `rel` = %d WHERE `id` = %d AND `uid` = %d LIMIT 1", intval(CONTACT_IS_FRIEND), intval($contact['id']), intval($importer['uid']) ); } // send notification? return; } require_once('include/Scrape.php'); $ret = probe_url($sender_handle); if((! count($ret)) || ($ret['network'] != NETWORK_DIASPORA)) { logger('diaspora_request: Cannot resolve diaspora handle ' . $sender_handle . ' for ' . $recipient_handle); return; } $r = q("INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`) VALUES ( %d, '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s',%d,%d) ", intval($importer['uid']), dbesc($ret['network']), dbesc($ret['addr']), datetime_convert(), dbesc($ret['url']), dbesc($ret['name']), dbesc($ret['nick']), dbesc($ret['photo']), dbesc($ret['pubkey']), dbesc($ret['notify']), dbesc($ret['poll']), 1, 2 ); // find the contact record we just created $contact_record = diaspora_get_contact_by_handle($importer['uid'],$sender_handle); $hash = random_string() . (string) time(); // Generate a confirm_key if($contact_record) { $ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`,`blocked`) VALUES ( %d, %d, 1, %d, '%s', '%s', '%s', 0 )", intval($importer['uid']), intval($contact_record['id']), 0, dbesc( t('Sharing notification from Diaspora network')), dbesc($hash), dbesc(datetime_convert()) ); } return; } function diaspora_post($importer,$xml) { $guid = notags(unxmlify($xml->guid)); $diaspora_handle = notags(unxmlify($xml->diaspora_handle)); $contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle); if(! $contact) return; if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) { logger('diaspora_post: Ignoring this author.'); http_status_exit(202); // NOTREACHED } $message_id = $diaspora_handle . ':' . $guid; $r = q("SELECT `id` FROM `item` WHERE `uid` = %d AND `uri` = '%s' AND `guid` = '%s' LIMIT 1", intval($importer['uid']), dbesc($message_id), dbesc($guid) ); if(count($r)) return; // allocate a guid on our system - we aren't fixing any collisions. // we're ignoring them $g = q("select * from guid where guid = '%s' limit 1", dbesc($guid) ); if(! count($g)) { q("insert into guid ( guid ) values ( '%s' )", dbesc($guid) ); } $created = unxmlify($xml->created_at); $private = ((unxmlify($xml->public) == 'false') ? 1 : 0); $body = unxmlify($xml->raw_message); require_once('library/HTMLPurifier.auto.php'); require_once('include/html2bbcode.php'); $maxlen = get_max_import_size(); if($maxlen && (strlen($body) > $maxlen)) $body = substr($body,0, $maxlen); if((strpos($body,'<') !== false) || (strpos($body,'>') !== false)) { $body = preg_replace('#]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?#s', '[youtube]$1[/youtube]', $body); $body = preg_replace('#].+?' . 'http://www.youtube.com/embed/([A-Za-z0-9\-_=]+).+?#s', '[youtube]$1[/youtube]', $body); $body = oembed_html2bbcode($body); $config = HTMLPurifier_Config::createDefault(); $config->set('Cache.DefinitionImpl', null); $purifier = new HTMLPurifier($config); $body = $purifier->purify($body); $body = html2bbcode($body); } $datarray = array(); $datarray['uid'] = $importer['uid']; $datarray['contact-id'] = $contact['id']; $datarray['wall'] = 0; $datarray['guid'] = $guid; $datarray['uri'] = $datarray['parent-uri'] = $message_id; $datarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created); $datarray['private'] = $private; $datarray['parent'] = 0; $datarray['owner-name'] = $contact['name']; $datarray['owner-link'] = $contact['url']; $datarray['owner-avatar'] = $contact['thumb']; $datarray['author-name'] = $contact['name']; $datarray['author-link'] = $contact['url']; $datarray['author-avatar'] = $contact['thumb']; $datarray['body'] = $body; item_store($datarray); return; } function diaspora_comment($importer,$xml,$msg) { $guid = notags(unxmlify($xml->guid)); $parent_guid = notags(unxmlify($xml->parent_guid)); $diaspora_handle = notags(unxmlify($xml->diaspora_handle)); $target_type = notags(unxmlify($xml->target_type)); $text = unxmlify($xml->text); $author_signature = notags(unxmlify($xml->author_signature)); $parent_author_signature = (($xml->parent_author_signature) ? notags(unxmlify($xml->parent_author_signature)) : ''); $text = $xml->text; $contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']); if(! $contact) return; if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) { logger('diaspora_comment: Ignoring this author.'); http_status_exit(202); // NOTREACHED } $r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1", intval($importer['uid']), dbesc($parent_guid) ); if(! count($r)) { logger('diaspora_comment: parent item not found: ' . $guid); return; } $parent_item = $r[0]; $author_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle; $author_signature = base64_decode($author_signature); if(stricmp($diaspora_handle,$msg['author']) == 0) { $person = $contact; $key = $msg['key']; } else { $person = find_person_by_handle($diaspora_handle); if(is_array($person) && x($person,'pubkey')) $key = $person['pubkey']; else { logger('diaspora_comment: unable to find author details'); return; } } if(! rsa_verify($author_signed_data,$author_signature,$key)) { logger('diaspora_comment: verification failed.'); return; } if($parent_author_signature) { $owner_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $msg['author']; $parent_author_signature = base64_decode($parent_author_signature); $key = $msg['key']; if(! rsa_verify($owner_signed_data,$parent_author_signature,$key)) { logger('diaspora_comment: owner verification failed.'); return; } } // Phew! Everything checks out. Now create an item. require_once('library/HTMLPurifier.auto.php'); require_once('include/html2bbcode.php'); $body = $text; $maxlen = get_max_import_size(); if($maxlen && (strlen($body) > $maxlen)) $body = substr($body,0, $maxlen); if((strpos($body,'<') !== false) || (strpos($body,'>') !== false)) { $body = preg_replace('#]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?#s', '[youtube]$1[/youtube]', $body); $body = preg_replace('#].+?' . 'http://www.youtube.com/embed/([A-Za-z0-9\-_=]+).+?#s', '[youtube]$1[/youtube]', $body); $body = oembed_html2bbcode($body); $config = HTMLPurifier_Config::createDefault(); $config->set('Cache.DefinitionImpl', null); $purifier = new HTMLPurifier($config); $body = $purifier->purify($body); $body = html2bbcode($body); } $message_id = $diaspora_handle . ':' . $guid; $datarray = array(); $datarray['uid'] = $importer['uid']; $datarray['contact-id'] = $contact['id']; $datarray['wall'] = $parent_item['wall']; $datarray['gravity'] = GRAVITY_COMMENT; $datarray['guid'] = $guid; $datarray['uri'] = $message_id; $datarray['parent-uri'] = $parent_item['uri']; // No timestamps for comments? OK, we'll the use current time. $datarray['created'] = $datarray['edited'] = datetime_convert(); $datarray['private'] = $parent_item['private']; $datarray['owner-name'] = $contact['name']; $datarray['owner-link'] = $contact['url']; $datarray['owner-avatar'] = $contact['thumb']; $datarray['author-name'] = $person['name']; $datarray['author-link'] = $person['url']; $datarray['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']); $datarray['body'] = $body; item_store($datarray); return; } function diaspora_like($importer,$xml,$msg) { $guid = notags(unxmlify($xml->guid)); $parent_guid = notags(unxmlify($xml->parent_guid)); $diaspora_handle = notags(unxmlify($xml->diaspora_handle)); $target_type = notags(unxmlify($xml->target_type)); $positive = notags(unxmlify($xml->positive)); $author_signature = notags(unxmlify($xml->author_signature)); $parent_author_signature = (($xml->parent_author_signature) ? notags(unxmlify($xml->parent_author_signature)) : ''); // likes on comments not supported here and likes on photos not supported by Diaspora if($target_type !== 'Post') return; $contact = diaspora_get_contact_by_handle($importer['uid'],$msg['author']); if(! $contact) return; if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) { logger('diaspora_like: Ignoring this author.'); http_status_exit(202); // NOTREACHED } $r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '%s' LIMIT 1", intval($importer['uid']), dbesc($parent_guid) ); if(! count($r)) { logger('diaspora_like: parent item not found: ' . $guid); return; } $parent_item = $r[0]; $r = q("SELECT * FROM `item` WHERE `uid` = %d AND `guid` = '$s' LIMIT 1", intval($importer['uid']), dbesc($guid) ); if(count($r)) { if($positive === 'true') { logger('diaspora_like: duplicate like: ' . $guid); return; } if($positive === 'false') { q("UPDATE `item` SET `deleted` = 1 WHERE `id` = %d AND `uid` = %d LIMIT 1", intval($r[0]['id']), intval($importer['uid']) ); // FIXME // send notification via proc_run() return; } } if($positive === 'false') { logger('diaspora_like: unlike received with no corresponding like'); return; } $author_signed_data = $guid . ';' . $parent_guid . ';' . $target_type . ';' . $positive . ';' . $diaspora_handle; $author_signature = base64_decode($author_signature); if(stricmp($diaspora_handle,$msg['author']) == 0) { $person = $contact; $key = $msg['key']; } else { $person = find_person_by_handle($diaspora_handle); if(is_array($person) && x($person,'pubkey')) $key = $person['pubkey']; else { logger('diaspora_comment: unable to find author details'); return; } } if(! rsa_verify($author_signed_data,$author_signature,$key)) { logger('diaspora_like: verification failed.'); return; } if($parent_author_signature) { $owner_signed_data = $guid . ';' . $parent_guid . ';' . $target_type . ';' . $positive . ';' . $msg['author']; $parent_author_signature = base64_decode($parent_author_signature); $key = $msg['key']; if(! rsa_verify($owner_signed_data,$parent_author_signature,$key)) { logger('diaspora_like: owner verification failed.'); return; } } // Phew! Everything checks out. Now create an item. $uri = $diaspora_handle . ':' . $guid; $activity = ACTIVITY_LIKE; $post_type = (($parent_item['resource-id']) ? t('photo') : t('status')); $objtype = (($parent_item['resource-id']) ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE ); $link = xmlify('' . "\n") ; $body = $parent_item['body']; $obj = <<< EOT $objtype 1 {$parent_item['uri']} $link $body EOT; $bodyverb = t('%1$s likes %2$s\'s %3$s'); $arr = array(); $arr['uri'] = $uri; $arr['uid'] = $importer['uid']; $arr['contact-id'] = $contact['id']; $arr['type'] = 'activity'; $arr['wall'] = $parent_item['wall']; $arr['gravity'] = GRAVITY_LIKE; $arr['parent'] = $parent_item['id']; $arr['parent-uri'] = $parent_item['uri']; $datarray['owner-name'] = $contact['name']; $datarray['owner-link'] = $contact['url']; $datarray['owner-avatar'] = $contact['thumb']; $datarray['author-name'] = $person['name']; $datarray['author-link'] = $person['url']; $datarray['author-avatar'] = ((x($person,'thumb')) ? $person['thumb'] : $person['photo']); $ulink = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]'; $alink = '[url=' . $parent_item['author-link'] . ']' . $parent_item['author-name'] . '[/url]'; $plink = '[url=' . $a->get_baseurl() . '/display/' . $importer['nickname'] . '/' . $parent_item['id'] . ']' . $post_type . '[/url]'; $arr['body'] = sprintf( $bodyverb, $ulink, $alink, $plink ); $arr['private'] = $parent_item['private']; $arr['verb'] = $activity; $arr['object-type'] = $objtype; $arr['object'] = $obj; $arr['visible'] = 1; $arr['unseen'] = 1; $arr['last-child'] = 0; $post_id = item_store($arr); // FIXME send notification } function diaspora_retraction($importer,$xml) { $guid = notags(unxmlify($xml->guid)); $diaspora_handle = notags(unxmlify($xml->diaspora_handle)); $contact = diaspora_get_contact_by_handle($importer['uid'],$diaspora_handle); if(! $contact) return; // if(($contact['rel'] == CONTACT_IS_FOLLOWER) || ($contact['blocked']) || ($contact['readonly'])) { // logger('diaspora_retraction: Ignoring this author.'); // http_status_exit(202); // // NOTREACHED // } } function diaspora_share($me,$contact) { $a = get_app(); $myaddr = $me['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3); $theiraddr = $contact['addr']; $tpl = get_markup_template('diaspora_share.tpl'); $msg = replace_macros($tpl, array( '$sender' => myaddr, '$recipient' => $theiraddr )); $slap = 'xml=' . urlencode(diaspora_msg_build($msg,$me,$contact,$me['prvkey'],$contact['pubkey'])); post_url($contact['notify'],$slap); $return_code = $a->get_curl_code(); return $return_code; } function diaspora_send_status($item,$owner,$contact) { $a = get_app(); $myaddr = $owner['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3); $theiraddr = $contact['addr']; require_once('include/bbcode.php'); $body = xmlify(bbcode($item['body'])); $public = (($item['private']) ? 'false' : 'true'); require_once('include/datetime.php'); $created = datetime_convert('UTC','UTC',$item['created'],'Y-m-d h:i:s \U\T\C'); $tpl = get_markup_template('diaspora_post.tpl'); $msg = replace_macros($tpl, array( '$body' => $body, '$guid' => $item['guid'], '$handle' => xmlify($myaddr), '$public' => $public, '$created' => $created )); logger('diaspora_send_status: base message: ' . $msg, LOGGER_DATA); $slap = 'xml=' . urlencode(diaspora_msg_build($msg,$owner,$contact,$owner['uprvkey'],$contact['pubkey'])); post_url($contact['notify'],$slap); $return_code = $a->get_curl_code(); logger('diaspora_send_status: returns: ' . $return_code); return $return_code; }