258 lines
6.8 KiB
PHP
258 lines
6.8 KiB
PHP
<?php
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require_once('include/crypto.php');
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function receive_return($val) {
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if($val >= 400)
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$err = 'Error';
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if($val >= 200 && $val < 300)
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$err = 'OK';
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logger('mod-diaspora returns ' . $val);
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
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killme();
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}
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function get_diaspora_key($uri) {
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$key = '';
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logger('Fetching diaspora key for: ' . $uri);
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$arr = lrdd($uri);
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if(is_array($arr)) {
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foreach($arr as $a) {
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if($a['@attributes']['rel'] === 'diaspora-public-key') {
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$key = base64_decode($a['@attributes']['href']);
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}
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}
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}
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else {
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return '';
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}
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if($key)
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return rsatopem($key);
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return '';
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}
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function diaspora_base_message($type,$data) {
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$tpl = get_markup_template('diaspora_' . $type . '.tpl');
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if(! $tpl)
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return '';
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return replace_macros($tpl,$data);
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}
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function diaspora_msg_build($msg,$user,$contact,$prvkey,$pubkey) {
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$a = get_app();
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$inner_aes_key = random_string(32);
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$b_inner_aes_key = base64_encode($inner_aes_key);
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$inner_iv = random_string(32);
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$b_inner_iv = base64_encode($inner_iv);
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$outer_aes_key = random_string(32);
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$b_outer_aes_key = base64_encode($outer_aes_key);
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$outer_iv = random_string(32);
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$b_outer_iv = base64_encode($outer_iv);
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$handle = 'acct:' . $user['nickname'] . '@' . substr($a->get_baseurl(), strpos($a->get_baseurl(),'://') + 3);
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$padded_data = pkcs5_pad($msg,16);
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$inner_encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $padded_data, MCRYPT_MODE_CBC, $inner_iv);
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$b64_data = base64_encode($inner_encrypted);
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$b64url_data = base64url_encode($b64_data);
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$b64url_stripped = str_replace(array("\n","\r"," ","\t"),array('','','',''),$b64url_data);
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$lines = str_split($b64url_stripped,60);
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$data = implode("\n",$lines);
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$data = $data . (($data[-1] != "\n") ? "\n" : '') ;
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$type = 'application/atom+xml';
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$encoding = 'base64url';
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$alg = 'RSA-SHA256';
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$signable_data = $data . '.' . base64url_encode($type) . "\n" . '.'
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. base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n";
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$signature = rsa_sign($signable_data,$prvkey);
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$sig = base64url_encode($signature);
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$decrypted_header = <<< EOT
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<decrypted_header>
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<iv>$b_inner_iv</iv>
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<aes_key>$b_inner_aes_key</aes_key>
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<author>
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<name>{$contact['name']}</name>
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<uri>$handle</uri>
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</author>
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</decrypted_header>
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EOT;
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$decrypted_header = pkcs5_pad($decrypted_header,16);
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$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $outer_aes_key, $decrypted_header, MCRYPT_MODE_CBC, $outer_iv);
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$outer_json = json_encode(array('iv' => $b_outer_iv,'key' => $b_outer_aes_key));
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$encrypted_outer_key_bundle = '';
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openssl_public_encrypt($outer_json,$encrypted_outer_key_bundle,$pubkey);
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$b64_encrypted_outer_key_bundle = base64_encode($encrypted_outer_key_bundle);
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$encrypted_header_json_object = json_encode(array('aes_key' => base64_encode($encrypted_outer_key_bundle),
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'ciphertext' => base64_encode($ciphertext)));
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$encrypted_header = '<encrypted_header>' . base64_encode($encrypted_header_json_object) . '</encrypted_header>';
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$magic_env = <<< EOT
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<?xml version='1.0' encoding='UTF-8'?>
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<entry xmlns='http://www.w3.org/2005/Atom'>
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$encrypted_header
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<me:env xmlns:me="http://salmon-protocol.org/ns/magic-env">
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<me:encoding>base64url</me:encoding>
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<me:alg>RSA-SHA256</me:alg>
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<me:data type="application/atom+xml">$data</me:data>
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<me:sig>$sig</me:sig>
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</me:env>
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</entry>
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EOT;
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return $magic_env;
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}
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function diaspora_decode($importer,$xml) {
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$basedom = parse_xml_string($xml);
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$atom = $basedom->children(NAMESPACE_ATOM1);
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$encrypted_header = json_decode(base64_decode($atom->encrypted_header));
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$encrypted_aes_key_bundle = base64_decode($encrypted_header->aes_key);
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$ciphertext = base64_decode($encrypted_header->ciphertext);
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$outer_key_bundle = '';
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openssl_private_decrypt($encrypted_aes_key_bundle,$outer_key_bundle,$importer['prvkey']);
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$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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/**
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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($decrypted,false);
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$inner_iv = base64_decode($idom->iv);
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$inner_aes_key = base64_decode($idom->aes_key);
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$author_link = str_replace('acct:','',$idom->author->uri);
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$dom = $basedom->children(NAMESPACE_SALMON_ME);
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// figure out where in the DOM tree our data is hiding
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if($dom->provenance->data)
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$base = $dom->provenance;
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elseif($dom->env->data)
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$base = $dom->env;
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elseif($dom->data)
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$base = $dom;
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if(! $base) {
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logger('mod-diaspora: unable to locate salmon data in xml ');
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dt_return(400);
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$signature = base64url_decode($base->sig);
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// unpack the data
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// strip whitespace so our data element will return to one big base64 blob
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$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
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// Add back the 60 char linefeeds
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$lines = str_split($data,60);
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$data = implode("\n",$lines);
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// stash away some other stuff for later
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$type = $base->data[0]->attributes()->type[0];
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$keyhash = $base->sig[0]->attributes()->keyhash[0];
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$encoding = $base->encoding;
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$alg = $base->alg;
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$signed_data = $data . (($data[-1] != "\n") ? "\n" : '') . '.' . base64url_encode($type) . "\n" . '.' . base64url_encode($encoding) . "\n" . '.' . base64url_encode($alg) . "\n";
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// decode the data
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$data = base64url_decode($data);
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// Now pull out the inner encrypted blob
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$inner_encrypted = base64_decode($data);
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$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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if(! $author_link) {
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logger('mod-diaspora: Could not retrieve author URI.');
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http_status_exit(400);
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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-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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if(! $key) {
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logger('mod-diaspora: Could not retrieve author key.');
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http_status_exit(400);
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}
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$verify = rsa_verify($signed_data,$signature,$key);
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if(! $verify) {
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logger('mod-diaspora: Message did not verify. Discarding.');
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http_status_exit(400);
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}
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logger('mod-diaspora: Message verified.');
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return $inner_decrypted;
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}
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