264 lines
6.9 KiB
PHP
264 lines
6.9 KiB
PHP
<?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) {
|
|
|
|
}
|
|
|
|
function diaspora_post($importer,$contact,$xml) {
|
|
|
|
}
|
|
|
|
function diaspora_comment($importer,$contact,$xml) {
|
|
|
|
}
|
|
|
|
function diaspora_like($importer,$contact,$xml) {
|
|
|
|
}
|
|
|
|
function diaspora_retraction($importer,$contact,$xml) {
|
|
|
|
}
|
|
|