basic diaspora decryption
This commit is contained in:
Friendika
parent
dbc3283681
commit
a61ec584d6
2 changed files with 117 additions and 30 deletions
17
boot.php
17
boot.php
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@ -2969,4 +2969,19 @@ function generate_guid() {
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$found = false;
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} while ($found == true );
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return $guid;
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}
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}
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function pkcs5_pad ($text, $blocksize)
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{
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$pad = $blocksize - (strlen($text) % $blocksize);
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return $text . str_repeat(chr($pad), $pad);
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}
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function pkcs5_unpad($text)
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{
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$pad = ord($text{strlen($text)-1});
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if ($pad > strlen($text)) return false;
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if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
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return substr($text, 0, -1 * $pad);
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}
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130
mod/receive.php
130
mod/receive.php
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@ -43,10 +43,68 @@ function receive_post(&$a) {
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if(! $xml)
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receive_return(500);
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// parse the xml
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$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
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$basedom = parse_xml_string($xml);
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if($basedom)
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logger('parsed dom');
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$atom = $basedom->children(NAMESPACE_ATOM1);
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logger('atom: ' . count($atom));
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$encrypted_header = json_decode(base64_decode($atom->encrypted_header));
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print_r($encrypted_header);
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$encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
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$ciphertext = base64_decode($encrypted_header->ciphertext);
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logger('encrypted_aes: ' . print_r($encrypted_aes_key_bundle,true));
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logger('ciphertext: ' . print_r($ciphertext,true));
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$outer_key_bundle = '';
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openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$localprvkey);
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logger('outer_bundle: ' . print_r($outer_key_bundle,true));
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$j_outer_key_bundle = json_decode($outer_key_bundle);
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$outer_iv = base64_decode($j_outer_key_bundle->iv);
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$outer_key = base64_decode($j_outer_key_bundle->key);
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$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $outer_key, $ciphertext, MCRYPT_MODE_CBC, $outer_iv);
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$decrypted = pkcs5_unpad($decrypted);
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logger('decrypted: ' . print_r($decrypted,true));
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/**
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* $decrypted now contains something like
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*
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* <decrypted_header>
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* <iv>8e+G2+ET8l5BPuW0sVTnQw==</iv>
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* <aes_key>UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU=</aes_key>
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* <author>
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* <name>Ryan Hughes</name>
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* <uri>acct:galaxor@diaspora.pirateship.org</uri>
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* </author>
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* </decrypted_header>
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*/
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$idom = parse_xml_string($decrypted,false);
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print_r($idom);
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$inner_iv = base64_decode($idom->iv);
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$inner_aes_key = base64_decode($idom->aes_key);
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logger('inner_iv: ' . $inner_iv);
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$dom = $basedom->children(NAMESPACE_SALMON_ME);
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if($dom)
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logger('have dom');
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logger('dom: ' . count($dom));
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// figure out where in the DOM tree our data is hiding
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if($dom->provenance->data)
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@ -58,12 +116,22 @@ function receive_post(&$a) {
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if(! $base) {
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logger('mod-diaspora: unable to locate salmon data in xml ');
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receive_return(400);
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dt_return(400);
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$signature = base64url_decode($base->sig);
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logger('signature: ' . bin2hex($signature));
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openssl_public_encrypt('test',$rrr,$ryanpubkey);
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logger('rrr: ' . $rrr);
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$pubdecsig = '';
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openssl_public_decrypt($signature,$pubdecsig,$ryanpubkey);
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logger('decsig: ' . bin2hex($pubdecsig));
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// unpack the data
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// strip whitespace so our data element will return to one big base64 blob
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@ -76,40 +144,28 @@ function receive_post(&$a) {
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$encoding = $base->encoding;
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$alg = $base->alg;
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$signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
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$signed_data = $data . "\n" . '.' . base64url_encode($type) . "\n" . '.' . base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n";
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logger('signed data: ' . $signed_data);
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// decode the data
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$data = base64url_decode($data);
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// Remove the xml declaration
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$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
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// Now pull out the inner encrypted blob
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// Create a fake feed wrapper so simplepie doesn't choke
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$tpl = get_markup_template('fake_feed.tpl');
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$base = substr($data,strpos($data,'<entry'));
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$feedxml = $tpl . $base . '</feed>';
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logger('mod-diaspora: Processed feed: ' . $feedxml);
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$inner_encrypted = base64_decode($data);
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// Now parse it like a normal atom feed to scrape out the author URI
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$feed = new SimplePie();
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$feed->set_raw_data($feedxml);
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$feed->enable_order_by_date(false);
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$feed->init();
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$inner_decrypted =
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$inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
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$inner_decrypted = pkcs5_unpad($inner_decrypted);
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logger('inner_decrypted: ' . $inner_decrypted);
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logger('mod-diaspora: Feed parsed.');
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if($feed->get_item_quantity()) {
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foreach($feed->get_items() as $item) {
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$author = $item->get_author();
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$author_link = unxmlify($author->get_link());
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break;
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}
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}
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if(! $author_link) {
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logger('mod-diaspora: Could not retrieve author URI.');
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@ -117,17 +173,25 @@ function receive_post(&$a) {
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}
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// Once we have the author URI, go to the web and try to find their public key
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// *** or look it up locally ***
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logger('mod-salmon: Fetching key for ' . $author_link );
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logger('mod-diaspora: Fetching key for ' . $author_link );
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// Get diaspora public key (pkcs#1) and convert to pkcs#8
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// $key = get_diaspora_key($author_link);
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$key = get_salmon_key($author_link,$keyhash);
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// $key = get_salmon_key($author_link,$keyhash);
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if(! $key) {
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logger('mod-salmon: Could not retrieve author key.');
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receive_return(400);
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}
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// FIXME
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// Use non salmon compliant signature
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/*
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// Setup RSA stuff to verify the signature
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set_include_path(get_include_path() . PATH_SEPARATOR . 'library' . PATH_SEPARATOR . 'phpsec');
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@ -155,6 +219,7 @@ function receive_post(&$a) {
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logger('mod-diaspora: Message did not verify. Discarding.');
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receive_return(400);
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}
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*/
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logger('mod-diaspora: Message verified.');
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@ -204,7 +269,14 @@ function receive_post(&$a) {
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$contact_rec = ((count($r)) ? $r[0] : null);
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consume_feed($feedxml,$importer,$contact_rec,$hub);
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// figure out what kind of diaspora message we have, and process accordingly.
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receive_return(200);
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}
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