2010-02-22 23:05:32 +09:00
|
|
|
<?php
|
|
|
|
/**
|
|
|
|
* StatusNet - the distributed open-source microblogging tool
|
|
|
|
* Copyright (C) 2010, StatusNet, Inc.
|
|
|
|
*
|
|
|
|
* A sample module to show best practices for StatusNet plugins
|
|
|
|
*
|
|
|
|
* PHP version 5
|
|
|
|
*
|
|
|
|
* This program is free software: you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU Affero General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*
|
|
|
|
* @package StatusNet
|
|
|
|
* @author James Walker <james@status.net>
|
|
|
|
* @copyright 2010 StatusNet, Inc.
|
|
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
|
|
|
|
* @link http://status.net/
|
|
|
|
*/
|
|
|
|
|
|
|
|
class MagicEnvelope
|
|
|
|
{
|
|
|
|
const ENCODING = 'base64url';
|
|
|
|
|
|
|
|
const NS = 'http://salmon-protocol.org/ns/magic-env';
|
|
|
|
|
|
|
|
private function normalizeUser($user_id)
|
|
|
|
{
|
|
|
|
if (substr($user_id, 0, 5) == 'http:' ||
|
|
|
|
substr($user_id, 0, 6) == 'https:' ||
|
|
|
|
substr($user_id, 0, 5) == 'acct:') {
|
|
|
|
return $user_id;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (strpos($user_id, '@') !== FALSE) {
|
|
|
|
return 'acct:' . $user_id;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 'http://' . $user_id;
|
|
|
|
}
|
|
|
|
|
|
|
|
public function getKeyPair($signer_uri)
|
|
|
|
{
|
2010-02-26 13:38:25 +09:00
|
|
|
$disco = new Discovery();
|
|
|
|
|
|
|
|
$links = $disco->lookup($signer_uri);
|
|
|
|
if ($link = Discovery::getService($links, 'magic-public-key')) {
|
|
|
|
list($type, $keypair) = explode(';', $link['href']);
|
|
|
|
return $keypair;
|
|
|
|
}
|
|
|
|
|
|
|
|
throw new Exception('Unable to locate signer public key');
|
|
|
|
//return 'RSA.79_L2gq-TD72Nsb5yGS0r9stLLpJZF5AHXyxzWmQmlqKl276LEJEs8CppcerLcR90MbYQUwt-SX9slx40Yq3vA==.AQAB.AR-jo5KMfSISmDAT2iMs2_vNFgWRjl5rbJVvA0SpGIEWyPdCGxlPtCbTexp8-0ZEIe8a4SyjatBECH5hxgMTpw==';
|
2010-02-22 23:05:32 +09:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
public function signMessage($text, $mimetype, $signer_uri)
|
|
|
|
{
|
|
|
|
$signer_uri = $this->normalizeUser($signer_uri);
|
|
|
|
|
|
|
|
if (!$this->checkAuthor($text, $signer_uri)) {
|
2010-02-25 23:39:16 +09:00
|
|
|
throw new Exception("Unable to determine entry author.");
|
2010-02-22 23:05:32 +09:00
|
|
|
}
|
|
|
|
|
2010-02-23 13:30:21 +09:00
|
|
|
$signature_alg = Magicsig::fromString($this->getKeyPair($signer_uri));
|
2010-02-22 23:05:32 +09:00
|
|
|
$armored_text = base64_encode($text);
|
|
|
|
|
|
|
|
return array(
|
|
|
|
'data' => $armored_text,
|
|
|
|
'encoding' => MagicEnvelope::ENCODING,
|
|
|
|
'data_type' => $mimetype,
|
|
|
|
'sig' => $signature_alg->sign($armored_text),
|
|
|
|
'alg' => $signature_alg->getName()
|
|
|
|
);
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
public function unfold($env)
|
|
|
|
{
|
|
|
|
$dom = new DOMDocument();
|
|
|
|
$dom->loadXML(base64_decode($env['data']));
|
|
|
|
|
|
|
|
if ($dom->documentElement->tagName != 'entry') {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
$prov = $dom->createElementNS(MagicEnvelope::NS, 'me:provenance');
|
|
|
|
$prov->setAttribute('xmlns:me', MagicEnvelope::NS);
|
|
|
|
$data = $dom->createElementNS(MagicEnvelope::NS, 'me:data', $env['data']);
|
|
|
|
$data->setAttribute('type', $env['data_type']);
|
|
|
|
$prov->appendChild($data);
|
|
|
|
$enc = $dom->createElementNS(MagicEnvelope::NS, 'me:encoding', $env['encoding']);
|
|
|
|
$prov->appendChild($enc);
|
|
|
|
$alg = $dom->createElementNS(MagicEnvelope::NS, 'me:alg', $env['alg']);
|
|
|
|
$prov->appendChild($alg);
|
|
|
|
$sig = $dom->createElementNS(MagicEnvelope::NS, 'me:sig', $env['sig']);
|
|
|
|
$prov->appendChild($sig);
|
|
|
|
|
|
|
|
$dom->documentElement->appendChild($prov);
|
|
|
|
|
|
|
|
return $dom->saveXML();
|
|
|
|
}
|
|
|
|
|
|
|
|
public function getAuthor($text) {
|
|
|
|
$doc = new DOMDocument();
|
|
|
|
if (!$doc->loadXML($text)) {
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ($doc->documentElement->tagName == 'entry') {
|
|
|
|
$authors = $doc->documentElement->getElementsByTagName('author');
|
|
|
|
foreach ($authors as $author) {
|
|
|
|
$uris = $author->getElementsByTagName('uri');
|
|
|
|
foreach ($uris as $uri) {
|
|
|
|
return $this->normalizeUser($uri->nodeValue);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
public function checkAuthor($text, $signer_uri)
|
|
|
|
{
|
|
|
|
return ($this->getAuthor($text) == $signer_uri);
|
|
|
|
}
|
|
|
|
|
|
|
|
public function verify($env)
|
|
|
|
{
|
|
|
|
if ($env['alg'] != 'RSA-SHA256') {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ($env['encoding'] != MagicEnvelope::ENCODING) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
$text = base64_decode($env['data']);
|
|
|
|
$signer_uri = $this->getAuthor($text);
|
|
|
|
|
2010-02-23 13:30:21 +09:00
|
|
|
$verifier = Magicsig::fromString($this->getKeyPair($signer_uri));
|
2010-02-22 23:05:32 +09:00
|
|
|
|
|
|
|
return $verifier->verify($env['data'], $env['sig']);
|
|
|
|
}
|
|
|
|
|
|
|
|
public function parse($text)
|
|
|
|
{
|
|
|
|
$dom = DOMDocument::loadXML($text);
|
|
|
|
return $this->fromDom($dom);
|
|
|
|
}
|
|
|
|
|
|
|
|
public function fromDom($dom)
|
|
|
|
{
|
|
|
|
if ($dom->documentElement->tagName == 'entry') {
|
|
|
|
$env_element = $dom->getElementsByTagNameNS(MagicEnvelope::NS, 'provenance')->item(0);
|
|
|
|
} else if ($dom->documentElement->tagName == 'me:env') {
|
|
|
|
$env_element = $dom->documentElement;
|
|
|
|
} else {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
$data_element = $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'data')->item(0);
|
|
|
|
|
|
|
|
return array(
|
|
|
|
'data' => trim($data_element->nodeValue),
|
|
|
|
'data_type' => $data_element->getAttribute('type'),
|
|
|
|
'encoding' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'encoding')->item(0)->nodeValue,
|
|
|
|
'alg' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'alg')->item(0)->nodeValue,
|
|
|
|
'sig' => $env_element->getElementsByTagNameNS(MagicEnvelope::NS, 'sig')->item(0)->nodeValue,
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|