magic-envelope verification, status.net appears to do it wrong.
Ultimately we need to do it right (or why bother having a spec?), and fallback to doing it wrong if we're talking to a broken system - which ironically seems to include most of the federated social web projects.
This commit is contained in:
Mike Macgirvin
parent
39b19cd089
commit
5edee3c4d1
73
boot.php
73
boot.php
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@ -2,7 +2,7 @@
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set_time_limit(0);
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define ( 'BUILD_ID', 1010 );
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define ( 'BUILD_ID', 1011 );
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define ( 'DFRN_PROTOCOL_VERSION', '2.0' );
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define ( 'EOL', "<br />\r\n" );
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@ -116,6 +116,7 @@ class App {
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private $db;
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private $curl_code;
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private $curl_headers;
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function __construct() {
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@ -204,6 +205,15 @@ class App {
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return $this->curl_code;
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}
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function set_curl_headers($headers) {
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$this->curl_headers = $headers;
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}
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function get_curl_headers() {
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return $this->curl_headers;
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}
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}}
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// retrieve the App structure
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@ -339,13 +349,12 @@ function t($s) {
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// results.
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if(! function_exists('fetch_url')) {
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function fetch_url($url,$binary = false) {
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function fetch_url($url,$binary = false, &$redirects = 0) {
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$ch = curl_init($url);
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if(! $ch) return false;
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if(($redirects > 8) || (! $ch))
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return false;
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curl_setopt($ch, CURLOPT_HEADER, 0);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
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curl_setopt($ch, CURLOPT_MAXREDIRS,8);
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curl_setopt($ch, CURLOPT_HEADER, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
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// by default we will allow self-signed certs
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@ -366,26 +375,41 @@ function fetch_url($url,$binary = false) {
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curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
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$s = curl_exec($ch);
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$info = curl_getinfo($ch);
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$header = substr($s,0,strpos($s,"\r\n\r\n"));
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if($http_code == 301 || $http_code == 302 || $http_code == 303) {
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$matches = array();
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preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
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$url = trim(array_pop($matches));
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$url_parsed = parse_url($url);
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if (isset($url_parsed)) {
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$redirects++;
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return fetch_url($url,$binary,$redirects);
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}
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}
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$a = get_app();
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$a->set_curl_code($info['http_code']);
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$a->set_curl_code($http_code);
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$body = substr($s,strlen($header)+4);
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$a->set_curl_headers($header);
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curl_close($ch);
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return($s);
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return($body);
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}}
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// post request to $url. $params is an array of post variables.
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if(! function_exists('post_url')) {
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function post_url($url,$params) {
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function post_url($url,$params, &$redirects = 0) {
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$ch = curl_init($url);
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if(! $ch) return false;
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if(($redirects > 8) || (! $ch))
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return false;
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curl_setopt($ch, CURLOPT_HEADER, 0);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
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curl_setopt($ch, CURLOPT_MAXREDIRS,8);
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curl_setopt($ch, CURLOPT_HEADER, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
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curl_setopt($ch, CURLOPT_POST,1);
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curl_setopt($ch, CURLOPT_POSTFIELDS,$params);
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$check_cert = get_config('system','verifyssl');
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
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$prx = get_config('system','proxy');
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@ -398,11 +422,26 @@ function post_url($url,$params) {
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}
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$s = curl_exec($ch);
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$info = curl_getinfo($ch);
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$header = substr($s,0,strpos($s,"\r\n\r\n"));
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if($http_code == 301 || $http_code == 302 || $http_code == 303) {
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$matches = array();
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preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
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$url = trim(array_pop($matches));
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$url_parsed = parse_url($url);
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if (isset($url_parsed)) {
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$redirects++;
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return post_url($url,$binary,$redirects);
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}
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}
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$a = get_app();
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$a->set_curl_code($info['http_code']);
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$a->set_curl_code($http_code);
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$body = substr($s,strlen($header)+4);
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$a->set_curl_headers($header);
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curl_close($ch);
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return($s);
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return($body);
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}}
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// random hash, 64 chars
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@ -62,6 +62,7 @@ CREATE TABLE IF NOT EXISTS `contact` (
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`issued-id` char(255) NOT NULL,
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`dfrn-id` char(255) NOT NULL,
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`url` char(255) NOT NULL,
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`lrdd` char(255) NOT NULL,
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`pubkey` text NOT NULL,
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`prvkey` text NOT NULL,
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`request` text NOT NULL,
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@ -139,7 +139,7 @@ function get_feed_for(&$a, $dfrn_id, $owner_id, $last_update, $direction = 0) {
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}
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$salmon = '<link rel="salmon" href="' . xmlify($a->get_baseurl() . '/salmon/' . $owner_nick) . '" />' . "\n" ;
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$salmon = ''; // remove this line when salmon handler is finished
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// $salmon = ''; // remove this line when salmon handler is finished
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$atom .= replace_macros($feed_template, array(
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'$feed_id' => xmlify($a->get_baseurl() . '/profile/' . $owner_nick),
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@ -16,3 +16,112 @@ function salmon_key($pubkey) {
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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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if(strstr($uri,'@')) {
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$arr = webfinger($uri);
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key from webfinger' . "\n", FILE_APPEND);
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}
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else {
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$html = fetch_url($uri);
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$a = get_app();
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$h = $a->get_curl_headers();
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via HTML header: ' . $h . "\n", FILE_APPEND);
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$l = explode("\n",$h);
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if(count($l)) {
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foreach($l as $line) {
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if($debugging)
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file_put_contents('salmon.out', "\n" . $line . "\n", FILE_APPEND);
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if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
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$link = $matches[1];
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via Link from header: ' . $link . "\n", FILE_APPEND);
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break;
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}
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}
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}
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}
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if(! isset($link)) {
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require_once('library/HTML5/Parser.php');
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$dom = HTML5_Parser::parse($html);
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if(! $dom)
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return '';
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$items = $dom->getElementsByTagName('link');
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foreach($items as $item) {
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$x = $item->getAttribute('rel');
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if($x == "lrdd") {
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$link = $item->getAttribute('href');
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Fetch key via HTML body' . $link . "\n", FILE_APPEND);
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break;
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}
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}
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}
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if(! isset($link))
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return '';
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$arr = fetch_xrd_links($link);
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if($arr) {
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foreach($arr as $a) {
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if($a['@attributes']['rel'] === 'magic-public-key') {
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$ret[] = $a['@attributes']['href'];
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}
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}
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}
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if(count($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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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 $a;
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}
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}
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return '';
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}
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@ -186,7 +186,7 @@ class ASN_BASE {
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case ASN_BOOLEAN:
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return new ASN_BOOLEAN((bool)$data);
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case ASN_INTEGER:
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return new ASN_INTEGER(strtr(base64_encode($data),'+/=','-_,'));
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return new ASN_INTEGER(strtr(base64_encode($data),'+/','-_'));
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// return new ASN_INTEGER(ord($data));
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case ASN_BIT_STR:
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return new ASN_BIT_STR(self::parseASNString($data, $level+1, $maxLevels));
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170
mod/salmon.php
170
mod/salmon.php
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@ -1,5 +1,15 @@
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<?php
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// TODO: pass keyhash to key discovery
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// add relevant contacts so they can use this
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// There is a lot of debug stuff in here because this is quite a
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// complicated process to try and sort out.
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require_once('include/salmon.php');
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require_once('simplepie/simplepie.inc');
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function salmon_return($val) {
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if($val >= 500)
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@ -18,7 +28,7 @@ function salmon_post(&$a) {
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$debugging = get_config('system','debugging');
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if($debugging)
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file_put_contents('salmon.out',$xml,FILE_APPEND);
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file_put_contents('salmon.out','New Salmon: ' . $xml . "\n",FILE_APPEND);
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$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
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$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
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@ -31,22 +41,168 @@ function salmon_post(&$a) {
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$importer = $r[0];
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require_once('include/items.php');
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// parse the xml
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$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
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if($debugging)
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file_put_contents('salmon.out', "\n" . print_r($dom,true) . "\n" , FILE_APPEND);
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// figure out where in the DOM tree our data is hiding
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if($dom->provenance->data)
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$base = $dom->provenance;
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elseif($dom->env->data)
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$base = $dom->env;
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elseif($dom->data)
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$base = $dom;
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if(! $base) {
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Unable to find salmon data in XML' . "\n" , FILE_APPEND);
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salmon_return(500);
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$signature = base64url_decode($base->sig);
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Encoded Signature: ' . $base->sig . "\n" , FILE_APPEND);
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// unpack our data element.
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// strip whitespace
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$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
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$type = $base->data[0]->attributes()->type[0];
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$encoding = $base->encoding;
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$alg = $base->alg;
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$signed_data = $data;
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// . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
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// decode it
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$data = base64url_decode($data);
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if($debugging)
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file_put_contents('salmon.out', "\n" . 'Signed data:>>>' . $signed_data . "<<<\n" , FILE_APPEND);
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// Remove the xml declaration
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$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
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// Create a fake feed wrapper so simplepie doesn't choke
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$tpl = load_view_file('view/atom_feed.tpl');
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$tpl = load_view_file('view/fake_feed.tpl');
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$base = substr($xml,strpos($xml,'<entry'));
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$base = substr($data,strpos($data,'<entry'));
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$xml = $tpl . $base . '</feed>';
|
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$feedxml = $tpl . $base . '</feed>';
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salmon_return(500); // until the handler is finished
|
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if($debugging) {
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file_put_contents('salmon.out', 'Processed feed: ' . $feedxml . "\n", FILE_APPEND);
|
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}
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|
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// consume_salmon($xml,$importer);
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// Now parse it like a normal atom feed to scrape out the author URI
|
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|
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$feed = new SimplePie();
|
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$feed->set_raw_data($feedxml);
|
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$feed->enable_order_by_date(false);
|
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$feed->init();
|
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|
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if($debugging) {
|
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file_put_contents('salmon.out', "\n" . 'Feed parsed.' . "\n", FILE_APPEND);
|
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}
|
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|
||||
|
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if($feed->get_item_quantity()) {
|
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foreach($feed->get_items() as $item) {
|
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$author = $item->get_author();
|
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$author_link = unxmlify($author->get_link());
|
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break;
|
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}
|
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}
|
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|
||||
if(! $author_link) {
|
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if($debugging)
|
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file_put_contents('salmon.out',"\n" . 'Could not retrieve author URI.' . "\n", FILE_APPEND);
|
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salmon_return(500);
|
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}
|
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|
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// Once we have the author URI, go to the web and find their public key
|
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|
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if($debugging) {
|
||||
file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
|
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}
|
||||
|
||||
$key = get_salmon_key($author_link,$keyhash);
|
||||
|
||||
if(! $key) {
|
||||
if($debugging)
|
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file_put_contents('salmon.out',"\n" . 'Could not retrieve author key.' . "\n", FILE_APPEND);
|
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salmon_return(500);
|
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}
|
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|
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// Setup RSA stuff to verify the signature
|
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|
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set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
|
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|
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require_once('phpsec/Crypt/RSA.php');
|
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|
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$key_info = explode('.',$key);
|
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|
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$m = base64url_decode($key_info[1]);
|
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$e = base64url_decode($key_info[2]);
|
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if($debugging)
|
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file_put_contents('salmon.out',"\n" . print_r($key_info,true) . "\n", FILE_APPEND);
|
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|
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$rsa = new CRYPT_RSA();
|
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$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
|
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$rsa->setHash('sha256');
|
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|
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$rsa->modulus = new Math_BigInteger($m, 256);
|
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$rsa->k = strlen($rsa->modulus->toBytes());
|
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$rsa->exponent = new Math_BigInteger($e, 256);
|
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|
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// We should have everything we need now. Let's see if it verifies.
|
||||
|
||||
$verify = $rsa->verify($signed_data,$signature);
|
||||
|
||||
if(! $verify) {
|
||||
if($debugging)
|
||||
file_put_contents('salmon.out',"\n" . 'Message did not verify. Discarding.' . "\n", FILE_APPEND);
|
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salmon_return(500);
|
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}
|
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|
||||
if($debugging)
|
||||
file_put_contents('salmon.out',"\n" . 'Message verified.' . "\n", FILE_APPEND);
|
||||
|
||||
|
||||
/*
|
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*
|
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* If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
|
||||
*
|
||||
*/
|
||||
|
||||
$r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND `lrdd` = '%s' AND `uid` = %d LIMIT 1",
|
||||
dbesc($author_link),
|
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intval($importer['uid'])
|
||||
);
|
||||
if(! count($r)) {
|
||||
if($debugging)
|
||||
file_put_contents('salmon.out',"\n" . 'Author unknown to us.' . "\n", FILE_APPEND);
|
||||
salmon_return(500);
|
||||
}
|
||||
|
||||
|
||||
require_once('include/items.php');
|
||||
|
||||
$hub = '';
|
||||
|
||||
consume_feed($feedxml,$importer,$r[0],$hub);
|
||||
|
||||
salmon_return(200);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -75,4 +75,8 @@ function update_1008() {
|
|||
|
||||
function update_1009() {
|
||||
q("ALTER TABLE `user` ADD `allow_location` TINYINT( 1 ) NOT NULL DEFAULT '0' AFTER `default-location` ");
|
||||
}
|
||||
}
|
||||
|
||||
function update_1010() {
|
||||
q("ALTER TABLE `contact` ADD `lrdd` CHAR( 255 ) NOT NULL AFTER `url` ");
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,18 @@
|
|||
<?xml version="1.0" encoding="utf-8" ?>
|
||||
<feed 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" >
|
||||
|
||||
<id>fake feed</id>
|
||||
<title>fake title</title>
|
||||
|
||||
<updated>1970-01-01T00:00:00Z</updated>
|
||||
|
||||
<author>
|
||||
<name>Fake Name</name>
|
||||
<uri>http://example.com</uri>
|
||||
</author>
|
||||
Loading…
Reference in New Issue
Block a user