278 lines
6.4 KiB
PHP
278 lines
6.4 KiB
PHP
<?php
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/**
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* Diaspora endpoint
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*/
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require_once('include/salmon.php');
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require_once('include/certfns.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 receive_post(&$a) {
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if($a->argc != 3 || $a->argv[1] !== 'users')
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receive_return(500);
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$guid = $a->argv[2];
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$r = q("SELECT * FROM `user` WHERE `guid` = '%s' LIMIT 1",
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dbesc($guid)
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);
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if(! count($r))
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salmon_return(500);
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$importer = $r[0];
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$xml = $_POST['xml'];
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logger('mod-diaspora: new salmon ' . $xml, LOGGER_DATA);
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if(! $xml)
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receive_return(500);
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$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($decrypted,false);
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$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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$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($base->sig);
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logger('signature: ' . bin2hex($signature));
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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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logger('signed data: ' . $signed_data);
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// decode the data
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$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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logger('inner_decrypted: ' . $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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receive_return(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(! $key) {
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logger('mod-salmon: Could not retrieve author key.');
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receive_return(400);
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}
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$verify = false;
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if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
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$verify = openssl_verify($signed_data,$signature,$key,'sha256');
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}
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else {
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// fallback sha256 verify for PHP < 5.3
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$rawsig = '';
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$hash = hash('sha256',$signed_data,true);
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openssl_public_decrypt($signature,$rawsig,$key);
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$verify = (($rawsig && substr($rawsig,-32) === $hash) ? true : false);
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}
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if(! $verify) {
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logger('mod-diaspora: Message did not verify. Discarding.');
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receive_return(400);
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}
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logger('mod-diaspora: Message verified.');
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// If we reached this point, the message is good.
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// Now let's figure out if the author is allowed to send us stuff.
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$r = q("SELECT * FROM `contact` WHERE `network` = 'dspr' AND ( `url` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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dbesc($author_link),
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dbesc($author_link),
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intval($importer['uid'])
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);
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if(! count($r)) {
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logger('mod-diaspora: Author unknown to us.');
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}
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// is this a follower? Or have we ignored the person?
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// If so we can not accept this post.
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if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
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logger('mod-diaspora: Ignoring this author.');
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receive_return(202);
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// NOTREACHED
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}
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require_once('include/items.php');
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// Placeholder for hub discovery. We shouldn't find any hubs
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// since we supplied the fake feed header - and it doesn't have any.
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$hub = '';
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/**
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*
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* anti-spam measure: consume_feed will accept a follow activity from
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* this person (and nothing else) if there is no existing contact record.
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*
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*/
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$contact_rec = ((count($r)) ? $r[0] : null);
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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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