SECURITY: signature issue

(cherry picked from commit c6f3298f7864756f4a9b7827e8490a3ee859f82f)

4 files changed, 29 insertions, 2 deletions

diff --git a/Zotlabs/Module/Magic.php b/Zotlabs/Module/Magic.php
index be6866592..71737eef8 100644
--- a/Zotlabs/Module/Magic.php
+++ b/Zotlabs/Module/Magic.php
@@ -146,12 +146,17 @@ class Magic extends \Zotlabs\Web\Controller {
 				$dest = strip_zids($dest);
 				$dest = strip_query_param($dest,'f');
 
+				$data = json_encode([ 'OpenWebAuth' => random_string() ]);
+
 				$headers = [];
 				$headers['Accept'] = 'application/x-zot+json' ;
 				$headers['X-Open-Web-Auth'] = random_string();
+				$headers['Host'] = $parsed['host'];
+				$headers['Digest'] = 'SHA-256=' . \Zotlabs\Web\HTTPSig::generate_digest($data,false);
+
 				$headers = \Zotlabs\Web\HTTPSig::create_sig('',$headers,$channel['channel_prvkey'],
 					'acct:' . $channel['channel_address'] . '@' . \App::get_hostname(),false,true,'sha512');
-				$x = z_fetch_url($basepath . '/owa',false,$redirects,[ 'headers' => $headers ]);
+				$x = z_post_url($basepath . '/owa',$data,$redirects,[ 'headers' => $headers ]);
 
 				if($x['success']) {
 					$j = json_decode($x['body'],true);
diff --git a/Zotlabs/Module/Owa.php b/Zotlabs/Module/Owa.php
index da26748b3..4a488086f 100644
--- a/Zotlabs/Module/Owa.php
+++ b/Zotlabs/Module/Owa.php
@@ -45,7 +45,7 @@ class Owa extends \Zotlabs\Web\Controller {
 						}
 						if($r) {
 							foreach($r as $hubloc) {
-								$verified = \Zotlabs\Web\HTTPSig::verify('',$hubloc['xchan_pubkey']);	
+								$verified = \Zotlabs\Web\HTTPSig::verify(file_get_contents('php://input'),$hubloc['xchan_pubkey']);	
 								if($verified && $verified['header_signed'] && $verified['header_valid']) {
 									logger('OWA header: ' . print_r($verified,true),LOGGER_DATA);	
 									logger('OWA success: ' . $hubloc['hubloc_addr'],LOGGER_DATA);
diff --git a/Zotlabs/Web/HTTPSig.php b/Zotlabs/Web/HTTPSig.php
index df66ecf5c..ec7bb0d67 100644
--- a/Zotlabs/Web/HTTPSig.php
+++ b/Zotlabs/Web/HTTPSig.php
@@ -104,6 +104,21 @@ class HTTPSig {
 			if(strpos($h,'.')) {
 				$spoofable = true;
 			}
+			if($h === 'host' && (strpos(strtolower(\App::get_hostname()),strtolower($headers[$h])) === false)) {
+				logger('bad host: ' . $sig_block['keyId'] . ' != ' . $headers[$h]);
+				return $result;
+			}
+			if($h === 'date') {
+				$d = new \DateTime($headers[$h]);
+				$d->setTimeZone(new \DateTimeZone('UTC'));
+				$dplus = datetime_convert('UTC','UTC','now + 1 day');
+				$dminus = datetime_convert('UTC','UTC','now - 1 day');
+				$c = $d->format('Y-m-d H:i:s');
+				if($c > $dplus || $c < $dminus) {
+					logger('bad time: ' . $c);
+					return $result;
+				}
+			}
 		}
 		$signed_data = rtrim($signed_data,"\n");
 
diff --git a/Zotlabs/Zot/Finger.php b/Zotlabs/Zot/Finger.php
index 559f9657a..1d20f5822 100644
--- a/Zotlabs/Zot/Finger.php
+++ b/Zotlabs/Zot/Finger.php
@@ -71,6 +71,11 @@ class Finger {
 			$url = 'https://' . $host;
 		}
 
+		$m = parse_url($url);
+		if($m) {
+			$parsed_host = strtolower($m['host']);
+		}
+
 		$rhs = '/.well-known/zot-info';
 		$https = ((strpos($url,'https://') === 0) ? true : false);
 
@@ -88,6 +93,8 @@ class Finger {
 			$headers = [];
 			$headers['X-Zot-Channel'] = $channel['channel_address'] . '@' . \App::get_hostname();
 			$headers['X-Zot-Nonce']   = random_string();
+			$headers['Host']          = $parsed['host'];
+
 			$xhead = \Zotlabs\Web\HTTPSig::create_sig('',$headers,$channel['channel_prvkey'],
 				'acct:' . $channel['channel_address'] . '@' . \App::get_hostname(),false);