<?php
-require_once('library/asn1.php');
+require_once('include/crypto.php');
-function salmon_key($pubkey) {
- $lines = explode("\n",$pubkey);
- unset($lines[0]);
- unset($lines[count($lines)]);
- $x = base64_decode(implode('',$lines));
- $r = ASN_BASE::parseASNString($x);
-
- $m = $r[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
- $e = $r[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
-
-
- return 'RSA' . '.' . $m . '.' . $e ;
-}
-
-
-function base64url_encode($s) {
- return strtr(base64_encode($s),'+/','-_');
-}
-
-function base64url_decode($s) {
- return base64_decode(strtr($s,'-_','+/'));
-}
function get_salmon_key($uri,$keyhash) {
$ret = array();
- $debugging = get_config('system','debugging');
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Fetch key' . "\n", FILE_APPEND);
-
- if(strstr($uri,'@')) {
- $arr = webfinger($uri);
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Fetch key from webfinger' . "\n", FILE_APPEND);
- }
- else {
- $html = fetch_url($uri);
- $a = get_app();
- $h = $a->get_curl_headers();
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Fetch key via HTML header: ' . $h . "\n", FILE_APPEND);
-
- $l = explode("\n",$h);
- if(count($l)) {
- foreach($l as $line) {
-
- if($debugging)
- file_put_contents('salmon.out', "\n" . $line . "\n", FILE_APPEND);
- if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
- $link = $matches[1];
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Fetch key via Link from header: ' . $link . "\n", FILE_APPEND);
- break;
- }
- }
- }
- }
-
- if(! isset($link)) {
- require_once('library/HTML5/Parser.php');
- $dom = HTML5_Parser::parse($html);
-
- if(! $dom)
- return '';
-
- $items = $dom->getElementsByTagName('link');
+ logger('Fetching salmon key for '.$uri);
- foreach($items as $item) {
- $x = $item->getAttribute('rel');
- if($x == "lrdd") {
- $link = $item->getAttribute('href');
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Fetch key via HTML body' . $link . "\n", FILE_APPEND);
- break;
- }
- }
- }
-
- if(! isset($link))
- return '';
+ $arr = lrdd($uri);
- $arr = fetch_xrd_links($link);
-
- if($arr) {
+ if(is_array($arr)) {
foreach($arr as $a) {
if($a['@attributes']['rel'] === 'magic-public-key') {
$ret[] = $a['@attributes']['href'];
}
}
}
+ else {
+ return '';
+ }
+
+ // We have found at least one key URL
+ // If it's inline, parse it - otherwise get the key
+
if(count($ret)) {
for($x = 0; $x < count($ret); $x ++) {
if(substr($ret[$x],0,5) === 'data:') {
$ret[$x] = fetch_url($ret[$x]);
}
}
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
+
+
+ logger('Key located: ' . print_r($ret,true));
if(count($ret) == 1) {
+
+ // We only found one one key so we don't care if the hash matches.
+ // If it's the wrong key we'll find out soon enough because
+ // message verification will fail. This also covers some older
+ // software which don't supply a keyhash. As long as they only
+ // have one key we'll be right.
+
return $ret[0];
}
else {
return '';
}
-
-
-
\ No newline at end of file
+
+
+function slapper($owner,$url,$slap) {
+
+ // does contact have a salmon endpoint?
+
+ if(! strlen($url))
+ return;
+
+
+ if(! $owner['sprvkey']) {
+ logger(sprintf("user '%s' (%d) does not have a salmon private key. Send failed.",
+ $owner['username'],$owner['uid']));
+ return;
+ }
+
+ // add all namespaces to item
+
+$namespaces = <<< EOT
+<entry xmlns="http://www.w3.org/2005/Atom"
+ xmlns:thr="http://purl.org/syndication/thread/1.0"
+ xmlns:at="http://purl.org/atompub/tombstones/1.0"
+ xmlns:media="http://purl.org/syndication/atommedia"
+ xmlns:dfrn="http://purl.org/macgirvin/dfrn/1.0"
+ xmlns:as="http://activitystrea.ms/spec/1.0/"
+ xmlns:georss="http://www.georss.org/georss"
+ xmlns:poco="http://portablecontacts.net/spec/1.0"
+ xmlns:ostatus="http://ostatus.org/schema/1.0"
+ xmlns:statusnet="http://status.net/schema/api/1/" > >
+EOT;
+
+ $slap = str_replace('<entry>',$namespaces,$slap);
+
+ logger('slapper called for '.$url.'. Data: ' . $slap);
+
+ // create a magic envelope
+
+ $data = base64url_encode($slap);
+ $data_type = 'application/atom+xml';
+ $encoding = 'base64url';
+ $algorithm = 'RSA-SHA256';
+ $keyhash = base64url_encode(hash('sha256',salmon_key($owner['spubkey'])),true);
+
+ // precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
+
+ $precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
+
+ $signature = base64url_encode(rsa_sign(str_replace('=','',$data . $precomputed),$owner['sprvkey']));
+
+ $signature2 = base64url_encode(rsa_sign($data . $precomputed,$owner['sprvkey']));
+
+ $signature3 = base64url_encode(rsa_sign($data,$owner['sprvkey']));
+
+ $salmon_tpl = get_markup_template('magicsig.tpl');
+
+ $salmon = replace_macros($salmon_tpl,array(
+ '$data' => $data,
+ '$encoding' => $encoding,
+ '$algorithm' => $algorithm,
+ '$keyhash' => $keyhash,
+ '$signature' => $signature
+ ));
+
+ // slap them
+ post_url($url,$salmon, array(
+ 'Content-type: application/magic-envelope+xml',
+ 'Content-length: ' . strlen($salmon)
+ ));
+
+ $a = get_app();
+ $return_code = $a->get_curl_code();
+
+ // check for success, e.g. 2xx
+
+ if($return_code > 299) {
+
+ logger('compliant salmon failed. Falling back to status.net hack2');
+
+ // Entirely likely that their salmon implementation is
+ // non-compliant. Let's try once more, this time only signing
+ // the data, without stripping '=' chars
+
+ $salmon = replace_macros($salmon_tpl,array(
+ '$data' => $data,
+ '$encoding' => $encoding,
+ '$algorithm' => $algorithm,
+ '$keyhash' => $keyhash,
+ '$signature' => $signature2
+ ));
+
+ // slap them
+ post_url($url,$salmon, array(
+ 'Content-type: application/magic-envelope+xml',
+ 'Content-length: ' . strlen($salmon)
+ ));
+ $return_code = $a->get_curl_code();
+
+
+ if($return_code > 299) {
+
+ logger('compliant salmon failed. Falling back to status.net hack3');
+
+ // Entirely likely that their salmon implementation is
+ // non-compliant. Let's try once more, this time only signing
+ // the data, without the precomputed blob
+
+ $salmon = replace_macros($salmon_tpl,array(
+ '$data' => $data,
+ '$encoding' => $encoding,
+ '$algorithm' => $algorithm,
+ '$keyhash' => $keyhash,
+ '$signature' => $signature3
+ ));
+
+ // slap them
+ post_url($url,$salmon, array(
+ 'Content-type: application/magic-envelope+xml',
+ 'Content-length: ' . strlen($salmon)
+ ));
+ $return_code = $a->get_curl_code();
+ }
+ }
+ logger('slapper for '.$url.' returned ' . $return_code);
+ if(! $return_code)
+ return(-1);
+ if(($return_code == 503) && (stristr($a->get_curl_headers(),'retry-after')))
+ return(-1);
+
+ return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
+}
+
projects / friendica.git / blobdiff