X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;ds=sidebyside;f=mod%2Fsalmon.php;h=1e16f9d14ba1d2e6b7b8fff8886b24adbcdef04d;hb=82d779a33b287699cb1e543d384445422e50710f;hp=30e87f243fd436779c1d165add5cfdf66014685b;hpb=a8a88d253296629d265242f03651419ed2982ec7;p=friendica.git

diff --git a/mod/salmon.php b/mod/salmon.php
index 30e87f243f..1e16f9d14b 100644
--- a/mod/salmon.php
+++ b/mod/salmon.php
@@ -1,22 +1,21 @@
 <?php
 
 
-// TODO: 
-// 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');
+require_once('include/crypto.php');
+require_once('library/simplepie/simplepie.inc');
 
 function salmon_return($val) {
 
-	if($val >= 500)
+	if($val >= 400)
 		$err = 'Error';
-	if($val == 200)
+	if($val >= 200 && $val < 300)
 		$err = 'OK';
-	
+
+	logger('mod-salmon returns ' . $val);	
 	header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
 	killme();
 
@@ -25,19 +24,17 @@ function salmon_return($val) {
 function salmon_post(&$a) {
 
 	$xml = file_get_contents('php://input');
-	
-	$debugging = get_config('system','debugging');
-	if($debugging)
-		file_put_contents('salmon.out','New Salmon: ' . $xml . "\n",FILE_APPEND);
+
+	logger('mod-salmon: new salmon ' . $xml, LOGGER_DATA);
 
 	$nick       = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
 	$mentions   = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
 
-	$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
+	$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 LIMIT 1",
 		dbesc($nick)
 	);
 	if(! count($r))
-		salmon_return(500);
+		http_status_exit(500);
 
 	$importer = $r[0];
 
@@ -45,10 +42,6 @@ function salmon_post(&$a) {
 
 	$dom = simplexml_load_string($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($dom->provenance->data)
@@ -59,9 +52,8 @@ function salmon_post(&$a) {
 		$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);
+		logger('mod-salmon: unable to locate salmon data in xml ');
+		http_status_exit(400);
 	}
 
 	// Stash the signature away for now. We have to find their key or it won't be good for anything.
@@ -69,9 +61,6 @@ function salmon_post(&$a) {
 
 	$signature = base64url_decode($base->sig);
 
-	if($debugging)
-		file_put_contents('salmon.out', "\n" . 'Encoded Signature: ' . $base->sig . "\n" , FILE_APPEND);
-
 	// unpack the  data
 
 	// strip whitespace so our data element will return to one big base64 blob
@@ -84,12 +73,16 @@ function salmon_post(&$a) {
 	$encoding = $base->encoding;
 	$alg = $base->alg;
 
-	// If we're talking to status.net or one of their ilk, they aren't following the magic envelope spec
-	// and only signed the data element. We'll be nice and let them validate anyway. 
+	// Salmon magic signatures have evolved and there is no way of knowing ahead of time which
+	// flavour we have. We'll try and verify it regardless.
 
 	$stnet_signed_data = $data;
+
 	$signed_data = $data  . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
 
+	$compliant_format = str_replace('=','',$signed_data);
+
+
 	// decode the data
 	$data = base64url_decode($data);
 
@@ -98,15 +91,13 @@ function salmon_post(&$a) {
 
 	// Create a fake feed wrapper so simplepie doesn't choke
 
-	$tpl = load_view_file('view/fake_feed.tpl');
+	$tpl = get_markup_template('fake_feed.tpl');
 	
 	$base = substr($data,strpos($data,'<entry'));
 
 	$feedxml = $tpl . $base . '</feed>';
 
-	if($debugging) {
-		file_put_contents('salmon.out', 'Processed feed: ' . $feedxml . "\n", FILE_APPEND);
-	}
+	logger('mod-salmon: Processed feed: ' . $feedxml);
 
 	// Now parse it like a normal atom feed to scrape out the author URI
 	
@@ -115,10 +106,7 @@ function salmon_post(&$a) {
     $feed->enable_order_by_date(false);
     $feed->init();
 
-	if($debugging) {
-		file_put_contents('salmon.out', "\n" . 'Feed parsed.' . "\n", FILE_APPEND);
-	}
-
+	logger('mod-salmon: Feed parsed.');
 
 	if($feed->get_item_quantity()) {
 		foreach($feed->get_items() as $item) {
@@ -129,64 +117,51 @@ function salmon_post(&$a) {
 	}
 
 	if(! $author_link) {
-		if($debugging)
-			file_put_contents('salmon.out',"\n" . 'Could not retrieve author URI.' . "\n", FILE_APPEND);
-		salmon_return(500);
+		logger('mod-salmon: Could not retrieve author URI.');
+		http_status_exit(400);
 	}
 
 	// Once we have the author URI, go to the web and try to find their public key
 
-	if($debugging) {
-		file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
-	}
+	logger('mod-salmon: Fetching key for ' . $author_link );
+
 
 	$key = get_salmon_key($author_link,$keyhash);
 
 	if(! $key) {
-		if($debugging)
-			file_put_contents('salmon.out',"\n" . 'Could not retrieve author key.' . "\n", FILE_APPEND);
-		salmon_return(500);
+		logger('mod-salmon: Could not retrieve author key.');
+		http_status_exit(400);
 	}
 
-	// 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);
+	logger('mod-salmon: key details: ' . print_r($key_info,true), LOGGER_DEBUG);
 
-    $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);
+	$pubkey = metopem($m,$e);
 
 	// We should have everything we need now. Let's see if it verifies.
-	// If it fails with the proper data format, try again using just the data
-	// (e.g. status.net)
 
-    $verify = $rsa->verify($signed_data,$signature);
+    $verify = rsa_verify($compliant_format,$signature,$pubkey);
+
+	if(! $verify) {
+		logger('mod-salmon: message did not verify using protocol. Trying padding hack.');
+	    $verify = rsa_verify($signed_data,$signature,$pubkey);
+    }
 
-	if(! $verify)
-	    $verify = $rsa->verify($stnet_signed_data,$signature);
+	if(! $verify) {
+		logger('mod-salmon: message did not verify using padding. Trying old statusnet hack.');
+	    $verify = rsa_verify($stnet_signed_data,$signature,$pubkey);
+    }
 
 	if(! $verify) {
-		if($debugging)
-			file_put_contents('salmon.out',"\n" . 'Message did not verify. Discarding.' . "\n", FILE_APPEND);
-		salmon_return(500);
+		logger('mod-salmon: Message did not verify. Discarding.');
+		http_status_exit(400);
 	}
 
-	if($debugging)
-		file_put_contents('salmon.out',"\n" . 'Message verified.' . "\n", FILE_APPEND);
+	logger('mod-salmon: Message verified.');
 
 
 	/*
@@ -195,16 +170,39 @@ function salmon_post(&$a) {
 	*
 	*/
 
-	$r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND `lrdd` = '%s' AND `uid` = %d LIMIT 1",
+	$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' ) 
+		AND `uid` = %d LIMIT 1",
+		dbesc(NETWORK_OSTATUS),
+		dbesc($author_link),
 		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);
+		logger('mod-salmon: Author unknown to us.');
+		if(get_pconfig($importer['uid'],'system','ostatus_autofriend')) {
+			require_once('include/follow.php');
+			$result = new_contact($importer['uid'],$author_link);
+			if($result['success']) {
+				$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' ) 
+					AND `uid` = %d LIMIT 1",
+					dbesc(NETWORK_OSTATUS),
+					dbesc($author_link),
+					dbesc($author_link),
+					intval($importer['uid'])
+				);
+			}
+		}
 	}	
 
+	// is this a follower? Or have we ignored the person?
+	// If so we can not accept this post.
+
+	if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
+		logger('mod-salmon: Ignoring this author.');
+		http_status_exit(202);
+		// NOTREACHED
+	}
+
 	require_once('include/items.php');
 
 	// Placeholder for hub discovery. We shouldn't find any hubs
@@ -212,9 +210,18 @@ function salmon_post(&$a) {
 
 	$hub = '';
 
-	consume_feed($feedxml,$importer,$r[0],$hub);
+	/**
+	 *
+	 * anti-spam measure: consume_feed will accept a follow activity from 
+	 * this person (and nothing else) if there is no existing contact record.
+	 *
+	 */
+
+	$contact_rec = ((count($r)) ? $r[0] : null);
+
+	consume_feed($feedxml,$importer,$contact_rec,$hub);
 
-	salmon_return(200);
+	http_status_exit(200);
 }