<?php
+require_once('include/certfns.php');
+function receive_return($val) {
+
+ if($val >= 400)
+ $err = 'Error';
+ if($val >= 200 && $val < 300)
+ $err = 'OK';
+
+ logger('mod-diaspora returns ' . $val);
+ header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
+ killme();
+
+}
+
+
+function get_diaspora_key($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) {
$outer_iv = random_string(32);
$b_outer_iv = base64_encode($outer_iv);
- $handle = 'acct:' . $user['nickname'] . '@' . substr($a->get_baseurl(), strpos('://') + 3);
+ $handle = 'acct:' . $user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
- $padded_data = pkcs5_pad($msg);
+ $padded_data = pkcs5_pad($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);
+echo "inner: $b64_data";
+
$b64url_data = base64url_encode($b64_data);
$b64url_stripped = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data);
$lines = str_split($b64url_stripped,60);
</decrypted_header>
EOT;
- $decrypted_header = pkcs5_pad($decrypted_header);
+ $decrypted_header = pkcs5_pad($decrypted_header,16);
+logger("decrypted_header: $decrypted_header");
$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
- $outer_json = json_encode(array('iv' => $b64_outer_iv,'key' => $b64_outer_aes_key));
+logger( "encrypted_ciphertext: " . base64_encode($ciphertext));
+ logger("encrypt_outer_key: $b_outer_aes_key");
+ logger("ecnrypt_outer_iv: $b_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);
'ciphertext' => base64_encode($ciphertext)));
$encrypted_header = '<encrypted_header>' . base64_encode($encrypted_header_json_object) . '</encrypted_header>';
-$magicenv = <<< EOT
+$magic_env = <<< EOT
<?xml version='1.0' encoding='UTF-8'?>
<entry xmlns='http://www.w3.org/2005/Atom'>
$encrypted_header
return $magic_env;
-}
\ No newline at end of file
+}
+
+
+function diaspora_decode($importer,$xml) {
+ $basedom = parse_xml_string($xml);
+
+ if($basedom)
+ logger('parsed dom');
+
+ $atom = $basedom->children(NAMESPACE_ATOM1);
+
+ logger('atom: ' . count($atom));
+ $encrypted_header = json_decode(base64_decode($atom->encrypted_header));
+
+ print_r($encrypted_header);
+
+ $encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
+ $ciphertext = base64_decode($encrypted_header->ciphertext);
+
+ logger('encrypted_aes: ' . print_r($encrypted_aes_key_bundle,true));
+ logger('ciphertext: ' . print_r($ciphertext,true));
+
+ $outer_key_bundle = '';
+ openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
+
+ logger('outer_bundle: ' . print_r($outer_key_bundle,true));
+
+ $j_outer_key_bundle = json_decode($outer_key_bundle);
+
+ $outer_iv = base64_decode($j_outer_key_bundle->iv);
+ $outer_key = base64_decode($j_outer_key_bundle->key);
+
+ logger("outer_iv: $outer_iv");
+ logger("outer_key: $outer_key");
+ logger("ciphertext: " . base64_encode($ciphertext));
+
+ $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
+
+ $decrypted = pkcs5_unpad($decrypted);
+
+ logger('decrypted: ' . print_r($decrypted,true));
+
+ /**
+ * $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);
+logger('idom: ' . print_r($idom,true));
+
+ $author_link = str_replace('acct:','',$idom->author->uri);
+
+ logger('inner_iv: ' . $inner_iv);
+
+ $dom = $basedom->children(NAMESPACE_SALMON_ME);
+
+ if($dom)
+ logger('have dom');
+
+ logger('dom: ' . count($dom));
+ // figure out where in the DOM tree our data is hiding
+
+ if($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);
+
+ logger('signature: ' . bin2hex($signature));
+
+ // 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";
+
+ logger('signed data: ' . $signed_data);
+
+ // 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);
+
+ logger('inner_decrypted: ' . $inner_decrypted);
+
+
+
+ if(! $author_link) {
+ logger('mod-diaspora: Could not retrieve author URI.');
+ receive_return(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-salmon: Could not retrieve author key.');
+ receive_return(400);
+ }
+
+ $verify = false;
+
+ if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
+ $verify = openssl_verify($signed_data,$signature,$key,'sha256');
+ }
+ else {
+ // fallback sha256 verify for PHP < 5.3
+ $rawsig = '';
+ $hash = hash('sha256',$signed_data,true);
+ openssl_public_decrypt($signature,$rawsig,$key);
+ $verify = (($rawsig && substr($rawsig,-32) === $hash) ? true : false);
+ }
+
+ if(! $verify) {
+ logger('mod-diaspora: Message did not verify. Discarding.');
+ receive_return(400);
+ }
+
+ logger('mod-diaspora: Message verified.');
+
+ return $inner_decrypted;
+
+}
+
+
+
+
projects / friendica.git / blobdiff