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Decode function is now there as well.

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Michael Vogel 2016-03-13 16:14:51 +01:00 committed by Roland Haeder
parent 7a0edc86ae
commit e90af0be68
No known key found for this signature in database
GPG key ID: B72F8185C6C7BD78
2 changed files with 174 additions and 9 deletions
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15
include/diaspora.php
View file

@ -111,18 +111,18 @@ function diaspora_dispatch($importer,$msg,$attempt=1) {
$ret = diaspora_reshare($importer,$xmlbase->reshare,$msg);
}
elseif($xmlbase->retraction) {
$tempfile = tempnam(get_temppath(), "diaspora-retraction");
file_put_contents($tempfile, json_encode($data));
//$tempfile = tempnam(get_temppath(), "diaspora-retraction");
//file_put_contents($tempfile, json_encode($data));
$ret = diaspora_retraction($importer,$xmlbase->retraction,$msg);
}
elseif($xmlbase->signed_retraction) {
$tempfile = tempnam(get_temppath(), "diaspora-signed_retraction");
file_put_contents($tempfile, json_encode($data));
//$tempfile = tempnam(get_temppath(), "diaspora-signed_retraction");
//file_put_contents($tempfile, json_encode($data));
$ret = diaspora_signed_retraction($importer,$xmlbase->signed_retraction,$msg);
}
elseif($xmlbase->relayable_retraction) {
$tempfile = tempnam(get_temppath(), "diaspora-relayable_retraction");
file_put_contents($tempfile, json_encode($data));
//$tempfile = tempnam(get_temppath(), "diaspora-relayable_retraction");
//file_put_contents($tempfile, json_encode($data));
$ret = diaspora_signed_retraction($importer,$xmlbase->relayable_retraction,$msg);
}
elseif($xmlbase->photo) {
@ -468,6 +468,9 @@ EOT;
function diaspora_decode($importer,$xml) {
$tempfile = tempnam(get_temppath(), "diaspora-decode");
file_put_contents($tempfile, json_encode(array("importer" => $importer, "xml" => $xml)));
$public = false;
$basedom = parse_xml_string($xml);

168
include/diaspora2.php
View file

@ -64,6 +64,168 @@ class diaspora {
return $relay;
}
function repair_signature($signature, $handle = "", $level = 1) {
if ($signature == "")
return ($signature);
if (base64_encode(base64_decode(base64_decode($signature))) == base64_decode($signature)) {
$signature = base64_decode($signature);
logger("Repaired double encoded signature from Diaspora/Hubzilla handle ".$handle." - level ".$level, LOGGER_DEBUG);
// Do a recursive call to be able to fix even multiple levels
if ($level < 10)
$signature = self::repair_signature($signature, $handle, ++$level);
}
return($signature);
}
/**
* @brief: Decodes incoming Diaspora message
*
* @param array $importer from user table
* @param string $xml urldecoded Diaspora salmon
*
* @return array
* 'message' -> decoded Diaspora XML message
* 'author' -> author diaspora handle
* 'key' -> author public key (converted to pkcs#8)
*/
function decode($importer, $xml) {
$public = false;
$basedom = parse_xml_string($xml);
if (!is_object($basedom))
return false;
$children = $basedom->children('https://joindiaspora.com/protocol');
if($children->header) {
$public = true;
$author_link = str_replace('acct:','',$children->header->author_id);
} else {
$encrypted_header = json_decode(base64_decode($children->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);
/**
* $decrypted now contains something like
*
* <decrypted_header>
* <iv>8e+G2+ET8l5BPuW0sVTnQw==</iv>
* <aes_key>UvSMb4puPeB14STkcDWq+4QE302Edu15oaprAQSkLKU=</aes_key>
* <author_id>galaxor@diaspora.priateship.org</author_id>
* </decrypted_header>
*/
logger('decrypted: '.$decrypted, LOGGER_DEBUG);
$idom = parse_xml_string($decrypted,false);
$inner_iv = base64_decode($idom->iv);
$inner_aes_key = base64_decode($idom->aes_key);
$author_link = str_replace('acct:','',$idom->author_id);
}
$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('unable to locate salmon data in xml');
http_status_exit(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);
// 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 = $data.'.'.base64url_encode($type).'.'.base64url_encode($encoding).'.'.base64url_encode($alg);
// decode the data
$data = base64url_decode($data);
if($public)
$inner_decrypted = $data;
else {
// Decode the encrypted blob
$inner_encrypted = base64_decode($data);
$inner_decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $inner_aes_key, $inner_encrypted, MCRYPT_MODE_CBC, $inner_iv);
$inner_decrypted = pkcs5_unpad($inner_decrypted);
}
if (!$author_link) {
logger('Could not retrieve author URI.');
http_status_exit(400);
}
// Once we have the author URI, go to the web and try to find their public key
// (first this will look it up locally if it is in the fcontact cache)
// This will also convert diaspora public key from pkcs#1 to pkcs#8
logger('Fetching key for '.$author_link);
$key = self::key($author_link);
if (!$key) {
logger('Could not retrieve author key.');
http_status_exit(400);
}
$verify = rsa_verify($signed_data,$signature,$key);
if (!$verify) {
logger('Message did not verify. Discarding.');
http_status_exit(400);
}
logger('Message verified.');
return array('message' => $inner_decrypted, 'author' => $author_link, 'key' => $key);
}
/**
* @brief Dispatches public messages and find the fitting receivers
*
@ -1287,7 +1449,7 @@ class diaspora {
$ret = self::person_by_handle($author);
if (!$ret || ($ret["network"] != NETWORK_DIASPORA)) {
logger("Cannot resolve diaspora handle ".$author ." for ".$recipient);
logger("Cannot resolve diaspora handle ".$author." for ".$recipient);
return false;
}
@ -1854,7 +2016,7 @@ class diaspora {
dbesc($slap),
intval($public_batch)
);
if(count($r)) {
if($r) {
logger("add_to_queue ignored - identical item already in queue");
} else {
// queue message for redelivery
@ -2211,7 +2373,7 @@ class diaspora {
intval($item["uid"])
);
if (!count($r)) {
if (!$r) {
logger("conversation not found.");
return;
}