Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
require_once('include/crypto.php');
function get_diaspora_key($uri) {
$key = '';
logger('Fetching diaspora key for: ' . $uri);
$arr = lrdd($uri);
if(is_array($arr)) {
foreach($arr as $a) {
if($a['@attributes']['rel'] === 'diaspora-public-key') {
$key = base64_decode($a['@attributes']['href']);
}
}
}
else {
return '';
}
if($key)
return rsatopem($key);
return '';
}
function diaspora_base_message($type,$data) {
$tpl = get_markup_template('diaspora_' . $type . '.tpl');
if(! $tpl)
return '';
return replace_macros($tpl,$data);
}
function diaspora_msg_build($msg,$user,$contact,$prvkey,$pubkey) {
$a = get_app();
$inner_aes_key = random_string(32);
$b_inner_aes_key = base64_encode($inner_aes_key);
$inner_iv = random_string(32);
$b_inner_iv = base64_encode($inner_iv);
$outer_aes_key = random_string(32);
$b_outer_aes_key = base64_encode($outer_aes_key);
$outer_iv = random_string(32);
$b_outer_iv = base64_encode($outer_iv);
$handle = 'acct:' . $user['nickname'] . '@' . substr($a->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);
$decrypted_header = <<< EOT
<decrypted_header>
<iv>$b_inner_iv</iv>
<aes_key>$b_inner_aes_key</aes_key>
<author>
<name>{$contact['name']}</name>
<uri>$handle</uri>
</author>
</decrypted_header>
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)));
$encrypted_header = '<encrypted_header>' . base64_encode($encrypted_header_json_object) . '</encrypted_header>';
$magic_env = <<< EOT
<?xml version='1.0' encoding='UTF-8'?>
<entry xmlns='http://www.w3.org/2005/Atom'>
$encrypted_header
<me:env xmlns:me="http://salmon-protocol.org/ns/magic-env">
<me:encoding>base64url</me:encoding>
<me:alg>RSA-SHA256</me:alg>
<me:data type="application/atom+xml">$data</me:data>
<me:sig>$sig</me:sig>
</me:env>
</entry>
EOT;
return $magic_env;
}
function diaspora_decode($importer,$xml) {
$basedom = parse_xml_string($xml);
$atom = $basedom->children(NAMESPACE_ATOM1);
$encrypted_header = json_decode(base64_decode($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
*
* <decrypted_header>
* <iv>8e+G2+ET8l5BPuW0sVTnQw==</iv>
* <aes_key>UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU=</aes_key>
* <author>
* <name>Ryan Hughes</name>
* <uri>acct:galaxor@diaspora.pirateship.org</uri>
* </author>
* </decrypted_header>
*/
$idom = parse_xml_string($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 ');
dt_return(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
$lines = str_split($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;
$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 $inner_decrypted;
}
function diaspora_request($importer,$contact,$xml) {
$sender_handle = $xml->sender_handle;
$recipient_handle = $xml->recipient_handle;
if(! $sender_handle || ! $recipient_handle)
return;
if($contact && ($contact['rel'] == CONTACT_IS_FOLLOWER || $contact['rel'] == CONTACT_IS_FRIEND)) {
q("UPDATE `contact` SET `rel` = %d WHERE `id` = %d AND `uid` = %d LIMIT 1",
intval(CONTACT_IS_FRIEND),
intval($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
$contact_record = null;
if($r) {
$r = q("SELECT `id` FROM `contact`
WHERE `uid` = %d AND `addr` = '%s' AND `poll` = '%s' LIMIT 1",
intval($importer['uid']),
$ret['addr'],
$ret['poll']
);
if(count($r))
$contact_record = $r[0];
}
$hash = random_string() . (string) time(); // Generate a confirm_key
if(is_array($contact_record)) {
$ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
VALUES ( %d, %d, 1, %d, '%s', '%s', '%s' )",
intval($importer['uid']),
intval($contact_record['id']),
0,
dbesc( t('Sharing notification from Diaspora network')),
dbesc($hash),
dbesc(datetime_convert())
);
}
return;
}
function diaspora_post($importer,$contact,$xml) {
$guid = notags(unxmlify($xml->guid));
$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
$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('#<object[^>]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s',
'[youtube]$1[/youtube]', $body);
$body = preg_replace('#<iframe[^>].+?' . 'http://www.youtube.com/embed/([A-Za-z0-9\-_=]+).+?</iframe>#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'] = $message_id;
$dattarray['created'] = $datarray['edited'] = datetime_convert('UTC','UTC',$created);
$dattarray['private'] = $private;
$dattarray['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'] = $contact['thumb'];
item_store($datarray);
return;
}
function diaspora_comment($importer,$contact,$xml) {
$guid = notags(unxmlify($xml->guid));
$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
$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;
$owner = q("SELECT * FROM `contact` WHERE `uid` = %d AND `self` = 1 LIMIT 1",
intval($importer['uid'])
);
if(! count($owner))
return;
$created = unxmlify($xml->created_at);
$private = ((unxmlify($xml->public) == 'false') ? 1 : 0);
}
function diaspora_like($importer,$contact,$xml) {
$guid = notags(unxmlify($xml->guid));
$diaspora_handle = notags(unxmlify($xml->diaspora_handle));
$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;
$owner = q("SELECT * FROM `contact` WHERE `uid` = %d AND `self` = 1 LIMIT 1",
intval($importer['uid'])
);
if(! count($owner))
return;
$created = unxmlify($xml->created_at);
$private = ((unxmlify($xml->public) == 'false') ? 1 : 0);
$uri = item_new_uri($a->get_hostname(),$owner_uid);
$post_type = (($item['resource-id']) ? t('photo') : t('status'));
$objtype = (($item['resource-id']) ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE );
$link = xmlify('<link rel="alternate" type="text/html" href="' . $a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id'] . '" />' . "\n") ;
$body = $item['body'];
$obj = <<< EOT
<object>
<type>$objtype</type>
<local>1</local>
<id>{$item['uri']}</id>
<link>$link</link>
<title></title>
<content>$body</content>
</object>
EOT;
if($verb === 'like')
$bodyverb = t('%1$s likes %2$s\'s %3$s');
if($verb === 'dislike')
$bodyverb = t('%1$s doesn\'t like %2$s\'s %3$s');
if(! isset($bodyverb))
return;
$arr = array();
$arr['uri'] = $uri;
$arr['uid'] = $owner_uid;
$arr['contact-id'] = $contact['id'];
$arr['type'] = 'activity';
$arr['wall'] = 1;
$arr['gravity'] = GRAVITY_LIKE;
$arr['parent'] = $item['id'];
$arr['parent-uri'] = $item['uri'];
$arr['owner-name'] = $owner['name'];
$arr['owner-link'] = $owner['url'];
$arr['owner-avatar'] = $owner['thumb'];
$arr['author-name'] = $contact['name'];
$arr['author-link'] = $contact['url'];
$arr['author-avatar'] = $contact['thumb'];
$ulink = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
$alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
$plink = '[url=' . $a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id'] . ']' . $post_type . '[/url]';
$arr['body'] = sprintf( $bodyverb, $ulink, $alink, $plink );
$arr['verb'] = $activity;
$arr['object-type'] = $objtype;
$arr['object'] = $obj;
$arr['allow_cid'] = $item['allow_cid'];
$arr['allow_gid'] = $item['allow_gid'];
$arr['deny_cid'] = $item['deny_cid'];
$arr['deny_gid'] = $item['deny_gid'];
$arr['visible'] = 1;
$arr['unseen'] = 1;
$arr['last-child'] = 0;
$post_id = item_store($arr);
if(! $item['visible']) {
$r = q("UPDATE `item` SET `visible` = 1 WHERE `id` = %d AND `uid` = %d LIMIT 1",
intval($item['id']),
intval($owner_uid)
);
}
$arr['id'] = $post_id;
}
function diaspora_retraction($importer,$contact,$xml) {
}