mexon/friendica
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Outgoing posts are now signed

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Michael 2018-09-20 21:45:23 +00:00
parent 11310f4cf0
commit 752b5fe284
2 changed files with 109 additions and 5 deletions
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22
src/Protocol/ActivityPub.php
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@ -20,6 +20,7 @@ use Friendica\Util\Crypto;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Util\JsonLD;
use Friendica\Util\LDSignature;
/**
* @brief ActivityPub Protocol class
@ -273,7 +274,10 @@ class ActivityPub
$data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
$data['object'] = self::createNote($item);
return $data;
$owner = User::getOwnerDataById($item['uid']);
return LDSignature::sign($data, $owner);
}
public static function createObjectFromItemID($item_id)
@ -369,7 +373,9 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
$signed = LDSignature::sign($data, $owner);
return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
public static function transmitContactAccept($target, $id, $uid)
@ -387,7 +393,9 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
$signed = LDSignature::sign($data, $owner);
return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
public static function transmitContactReject($target, $id, $uid)
@ -405,7 +413,9 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
$signed = LDSignature::sign($data, $owner);
return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
public static function transmitContactUndo($target, $uid)
@ -425,7 +435,9 @@ class ActivityPub
'to' => $profile['url']];
logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
return HTTPSignature::transmit($data, $profile['inbox'], $uid);
$signed = LDSignature::sign($data, $owner);
return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
/**

92
src/Util/LDSignature.php Normal file
View file

@ -0,0 +1,92 @@
<?php
namespace Friendica\Util;
use Friendica\Util\JsonLD;
use Friendica\Util\DateTimeFormat;
use Friendica\Protocol\ActivityPub;
class LDSignature
{
public static function isSigned($data)
{
return !empty($data['signature']);
}
public static function isVerified($data, $pubkey = null)
{
if (!self::isSigned($data)) {
return false;
}
if (empty($pubkey)) {
$actor = JsonLD::fetchElement($data, 'actor', 'id');
if (empty($actor)) {
return false;
}
$profile = ActivityPub::fetchprofile($actor);
if (empty($profile['pubkey'])) {
return false;
}
$pubkey = $profile['pubkey'];
}
$ohash = self::hash(self::signable_options($data['signature']));
$dhash = self::hash(self::signable_data($data));
$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
logger('LD-verify: ' . intval($x));
return $x;
}
public static function sign($data, $owner)
{
$options = [
'type' => 'RsaSignature2017',
'nonce' => random_string(64),
'creator' => $owner['url'] . '#main-key',
'created' => DateTimeFormat::utcNow()
];
$ohash = self::hash(self::signable_options($options));
$dhash = self::hash(self::signable_data($data));
$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
return array_merge($data, ['signature' => $options]);
}
private static function signable_data($data)
{
$newdata = [];
if (!empty($data)) {
foreach ($data as $k => $v) {
if (!in_array($k, ['signature'])) {
$newdata[$k] = $v;
}
}
}
return $newdata;
}
private static function signable_options($options)
{
$newopts = ['@context' => 'https://w3id.org/identity/v1'];
if (!empty($options)) {
foreach ($options as $k => $v) {
if (!in_array($k, ['type','id','signatureValue'])) {
$newopts[$k] = $v;
}
}
}
return $newopts;
}
private static function hash($obj)
{
return hash('sha256', JsonLD::normalize($obj));
}
}