kopia lustrzana https://github.com/friendica/friendica
186 wiersze
4.5 KiB
PHP
186 wiersze
4.5 KiB
PHP
<?php
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require_once('library/asn1.php');
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function salmon_key($pubkey) {
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$lines = explode("\n",$pubkey);
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unset($lines[0]);
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unset($lines[count($lines)]);
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$x = base64_decode(implode('',$lines));
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$r = ASN_BASE::parseASNString($x);
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$m = $r[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
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$e = $r[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
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return 'RSA' . '.' . $m . '.' . $e ;
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}
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function base64url_encode($s) {
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return strtr(base64_encode($s),'+/','-_');
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}
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function base64url_decode($s) {
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return base64_decode(strtr($s,'-_','+/'));
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}
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function get_salmon_key($uri,$keyhash) {
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$ret = array();
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$debugging = get_config('system','debugging');
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key' . "\n", FILE_APPEND);
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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'] === 'magic-public-key') {
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$ret[] = $a['@attributes']['href'];
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}
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}
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}
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else {
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return '';
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}
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// We have found at least one key URL
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// If it's inline, parse it - otherwise get the key
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if(count($ret)) {
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for($x = 0; $x < count($ret); $x ++) {
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if(substr($ret[$x],0,5) === 'data:') {
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if(strstr($ret[$x],','))
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$ret[$x] = substr($ret[$x],strpos($ret[$x],',')+1);
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else
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$ret[$x] = substr($ret[$x],5);
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}
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else
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$ret[$x] = fetch_url($ret[$x]);
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}
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}
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
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if(count($ret) == 1) {
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// We only found one one key so we don't care if the hash matches.
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// If it's the wrong key we'll find out soon enough because
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// message verification will fail. This also covers some older
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// software which don't supply a keyhash. As long as they only
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// have one key we'll be right.
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return $ret[0];
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}
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else {
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foreach($ret as $a) {
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$hash = base64url_encode(hash('sha256',$a));
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if($hash == $keyhash)
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return $a;
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}
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}
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return '';
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}
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function slapper($owner,$contact,$slap) {
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// does contact have a salmon endpoint?
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if(! strlen($contact['notify']))
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return;
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// add all namespaces to item
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$namespaces = <<< EOT
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<entry xmlns="http://www.w3.org/2005/Atom"
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xmlns:thr="http://purl.org/syndication/thread/1.0"
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xmlns:at="http://purl.org/atompub/tombstones/1.0"
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xmlns:media="http://purl.org/syndication/atommedia"
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xmlns:dfrn="http://purl.org/macgirvin/dfrn/1.0"
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xmlns:as="http://activitystrea.ms/spec/1.0/"
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xmlns:georss="http://www.georss.org/georss"
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xmlns:poco="http://portablecontacts.net/spec/1.0" >
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EOT;
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$slap = str_replace('<entry>',$namespaces,$slap);
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// create a magic envelope
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$data = base64url_encode($slap);
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$data_type = 'application/atom+xml';
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$encoding = 'base64url';
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$algorithm = 'RSA-SHA256';
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$keyhash = base64url_encode(hash('sha256',salmon_key($owner['spubkey'])));
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// Setup RSA stuff to PKCS#1 sign the data
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set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
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require_once('phpsec/Crypt/RSA.php');
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$rsa = new CRYPT_RSA();
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$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
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$rsa->setHash('sha256');
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$rsa->loadKey($owner['sprvkey']);
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// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
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$precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
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$signature = base64url_encode($rsa->sign($data . $precomputed));
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$signature2 = base64url_encode($rsa->sign($data));
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$salmon_tpl = load_view_file('view/magicsig.tpl');
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$salmon = replace_macros($salmon_tpl,array(
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'$data' => $data,
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'$encoding' => $encoding,
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'$algorithm' => $algorithm,
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'$keyhash' => $keyhash,
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'$signature' => $signature
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));
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// slap them
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post_url($contact['notify'],$salmon, array(
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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));
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$a = get_app();
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$return_code = trim($a->get_curl_code);
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// check for success, e.g. 2xx
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if(substr($return_code,0,1) !== '2') {
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// Entirely likely that their salmon implementation is
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// non-compliant. Let's try once more, this time only signing
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// the data, without the precomputed blob
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$salmon = replace_macros($salmon_tpl,array(
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'$data' => $data,
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'$encoding' => $encoding,
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'$algorithm' => $algorithm,
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'$keyhash' => $keyhash,
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'$signature' => $signature2
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));
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// slap them
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post_url($contact['notify'],$salmon, array(
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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));
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$return_code = trim($a->get_curl_code);
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}
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return;
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}
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