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magic-envelope verification, status.net appears to do it wrong.

Browse source 
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 2010-10-21 04:53:43 -07:00
parent 39b19cd089
commit 5edee3c4d1
8 changed files with 354 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

73
boot.php
View file

@ -2,7 +2,7 @@
set_time_limit(0);
define ( 'BUILD_ID', 1010 );
define ( 'BUILD_ID', 1011 );
define ( 'DFRN_PROTOCOL_VERSION', '2.0' );
define ( 'EOL', "<br />\r\n" );
@ -116,6 +116,7 @@ class App {
private $db;
private $curl_code;
private $curl_headers;
function __construct() {
@ -204,6 +205,15 @@ class App {
return $this->curl_code;
}
function set_curl_headers($headers) {
$this->curl_headers = $headers;
}
function get_curl_headers() {
return $this->curl_headers;
}
}}
// retrieve the App structure
@ -339,13 +349,12 @@ function t($s) {
// results.
if(! function_exists('fetch_url')) {
function fetch_url($url,$binary = false) {
function fetch_url($url,$binary = false, &$redirects = 0) {
$ch = curl_init($url);
if(! $ch) return false;
if(($redirects > 8) || (! $ch))
return false;
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
curl_setopt($ch, CURLOPT_MAXREDIRS,8);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
// by default we will allow self-signed certs
@ -366,26 +375,41 @@ function fetch_url($url,$binary = false) {
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$s = curl_exec($ch);
$info = curl_getinfo($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$header = substr($s,0,strpos($s,"\r\n\r\n"));
if($http_code == 301 || $http_code == 302 || $http_code == 303) {
$matches = array();
preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
$url = trim(array_pop($matches));
$url_parsed = parse_url($url);
if (isset($url_parsed)) {
$redirects++;
return fetch_url($url,$binary,$redirects);
}
}
$a = get_app();
$a->set_curl_code($info['http_code']);
$a->set_curl_code($http_code);
$body = substr($s,strlen($header)+4);
$a->set_curl_headers($header);
curl_close($ch);
return($s);
return($body);
}}
// post request to $url. $params is an array of post variables.
if(! function_exists('post_url')) {
function post_url($url,$params) {
function post_url($url,$params, &$redirects = 0) {
$ch = curl_init($url);
if(! $ch) return false;
if(($redirects > 8) || (! $ch))
return false;
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
curl_setopt($ch, CURLOPT_MAXREDIRS,8);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$params);
$check_cert = get_config('system','verifyssl');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
$prx = get_config('system','proxy');
@ -398,11 +422,26 @@ function post_url($url,$params) {
}
$s = curl_exec($ch);
$info = curl_getinfo($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$header = substr($s,0,strpos($s,"\r\n\r\n"));
if($http_code == 301 || $http_code == 302 || $http_code == 303) {
$matches = array();
preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
$url = trim(array_pop($matches));
$url_parsed = parse_url($url);
if (isset($url_parsed)) {
$redirects++;
return post_url($url,$binary,$redirects);
}
}
$a = get_app();
$a->set_curl_code($info['http_code']);
$a->set_curl_code($http_code);
$body = substr($s,strlen($header)+4);
$a->set_curl_headers($header);
curl_close($ch);
return($s);
return($body);
}}
// random hash, 64 chars

1
database.sql
View file

@ -62,6 +62,7 @@ CREATE TABLE IF NOT EXISTS `contact` (
`issued-id` char(255) NOT NULL,
`dfrn-id` char(255) NOT NULL,
`url` char(255) NOT NULL,
`lrdd` char(255) NOT NULL,
`pubkey` text NOT NULL,
`prvkey` text NOT NULL,
`request` text NOT NULL,

2
include/items.php
View file

@ -139,7 +139,7 @@ function get_feed_for(&$a, $dfrn_id, $owner_id, $last_update, $direction = 0) {
}
$salmon = '<link rel="salmon" href="' . xmlify($a->get_baseurl() . '/salmon/' . $owner_nick) . '" />' . "\n" ;
$salmon = ''; // remove this line when salmon handler is finished
// $salmon = ''; // remove this line when salmon handler is finished
$atom .= replace_macros($feed_template, array(
'$feed_id' => xmlify($a->get_baseurl() . '/profile/' . $owner_nick),

109
include/salmon.php
View file

@ -16,3 +16,112 @@ function salmon_key($pubkey) {
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 = $dom->getElementsByTagName('link');
foreach($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 '';
$arr = fetch_xrd_links($link);
if($arr) {
foreach($arr as $a) {
if($a['@attributes']['rel'] === 'magic-public-key') {
$ret[] = $a['@attributes']['href'];
}
}
}
if(count($ret)) {
for($x = 0; $x < count($ret); $x ++) {
if(substr($ret[$x],0,5) === 'data:') {
if(strstr($ret[$x],','))
$ret[$x] = substr($ret[$x],strpos($ret[$x],',')+1);
else
$ret[$x] = substr($ret[$x],5);
}
else
$ret[$x] = fetch_url($ret[$x]);
}
}
if($debugging)
file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
if(count($ret) == 1) {
return $ret[0];
}
else {
foreach($ret as $a) {
$hash = base64url_encode(hash('sha256',$a));
if($hash == $keyhash)
return $a;
}
}
return '';
}

2
library/asn1.php
View file

@ -186,7 +186,7 @@ class ASN_BASE {
case ASN_BOOLEAN:
return new ASN_BOOLEAN((bool)$data);
case ASN_INTEGER:
return new ASN_INTEGER(strtr(base64_encode($data),'+/=','-_,'));
return new ASN_INTEGER(strtr(base64_encode($data),'+/','-_'));
// return new ASN_INTEGER(ord($data));
case ASN_BIT_STR:
return new ASN_BIT_STR(self::parseASNString($data, $level+1, $maxLevels));

170
mod/salmon.php
View file

@ -1,5 +1,15 @@
<?php
// TODO: pass keyhash to key discovery
// add relevant contacts so they can use this
// There is a lot of debug stuff in here because this is quite a
// complicated process to try and sort out.
require_once('include/salmon.php');
require_once('simplepie/simplepie.inc');
function salmon_return($val) {
if($val >= 500)
@ -18,7 +28,7 @@ function salmon_post(&$a) {
$debugging = get_config('system','debugging');
if($debugging)
file_put_contents('salmon.out',$xml,FILE_APPEND);
file_put_contents('salmon.out','New Salmon: ' . $xml . "\n",FILE_APPEND);
$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
@ -31,22 +41,168 @@ function salmon_post(&$a) {
$importer = $r[0];
require_once('include/items.php');
// parse the xml
$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
if($debugging)
file_put_contents('salmon.out', "\n" . print_r($dom,true) . "\n" , FILE_APPEND);
// figure out where in the DOM tree our data is hiding
if($dom->provenance->data)
$base = $dom->provenance;
elseif($dom->env->data)
$base = $dom->env;
elseif($dom->data)
$base = $dom;
if(! $base) {
if($debugging)
file_put_contents('salmon.out', "\n" . 'Unable to find salmon data in XML' . "\n" , FILE_APPEND);
salmon_return(500);
}
// Stash the signature away for now. We have to find their key or it won't be good for anything.
$signature = base64url_decode($base->sig);
if($debugging)
file_put_contents('salmon.out', "\n" . 'Encoded Signature: ' . $base->sig . "\n" , FILE_APPEND);
// unpack our data element.
// strip whitespace
$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
$type = $base->data[0]->attributes()->type[0];
$encoding = $base->encoding;
$alg = $base->alg;
$signed_data = $data;
// . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
// decode it
$data = base64url_decode($data);
if($debugging)
file_put_contents('salmon.out', "\n" . 'Signed data:>>>' . $signed_data . "<<<\n" , FILE_APPEND);
// Remove the xml declaration
$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
// Create a fake feed wrapper so simplepie doesn't choke
$tpl = load_view_file('view/atom_feed.tpl');
$tpl = load_view_file('view/fake_feed.tpl');
$base = substr($xml,strpos($xml,'<entry'));
$base = substr($data,strpos($data,'<entry'));
$xml = $tpl . $base . '</feed>';
$feedxml = $tpl . $base . '</feed>';
salmon_return(500); // until the handler is finished
if($debugging) {
file_put_contents('salmon.out', 'Processed feed: ' . $feedxml . "\n", FILE_APPEND);
}
// consume_salmon($xml,$importer);
// Now parse it like a normal atom feed to scrape out the author URI
$feed = new SimplePie();
$feed->set_raw_data($feedxml);
$feed->enable_order_by_date(false);
$feed->init();
if($debugging) {
file_put_contents('salmon.out', "\n" . 'Feed parsed.' . "\n", FILE_APPEND);
}
if($feed->get_item_quantity()) {
foreach($feed->get_items() as $item) {
$author = $item->get_author();
$author_link = unxmlify($author->get_link());
break;
}
}
if(! $author_link) {
if($debugging)
file_put_contents('salmon.out',"\n" . 'Could not retrieve author URI.' . "\n", FILE_APPEND);
salmon_return(500);
}
// Once we have the author URI, go to the web and find their public key
if($debugging) {
file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
}
$key = get_salmon_key($author_link,$keyhash);
if(! $key) {
if($debugging)
file_put_contents('salmon.out',"\n" . 'Could not retrieve author key.' . "\n", FILE_APPEND);
salmon_return(500);
}
// Setup RSA stuff to verify the signature
set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
require_once('phpsec/Crypt/RSA.php');
$key_info = explode('.',$key);
$m = base64url_decode($key_info[1]);
$e = base64url_decode($key_info[2]);
if($debugging)
file_put_contents('salmon.out',"\n" . print_r($key_info,true) . "\n", FILE_APPEND);
$rsa = new CRYPT_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->setHash('sha256');
$rsa->modulus = new Math_BigInteger($m, 256);
$rsa->k = strlen($rsa->modulus->toBytes());
$rsa->exponent = new Math_BigInteger($e, 256);
// 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);
salmon_return(500);
}
if($debugging)
file_put_contents('salmon.out',"\n" . 'Message verified.' . "\n", FILE_APPEND);
/*
*
* 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),
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);
}

4
update.php
View file

@ -76,3 +76,7 @@ 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` ");
}

18
view/fake_feed.tpl Normal file
View file

@ -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>