Allow wildcard * to be used in trusted domains

config/config.sample.php

@@ -58,6 +58,12 @@
  * Your list of trusted domains that users can log into. Specifying trusted
  * domains prevents host header poisoning. Do not remove this, as it performs
  * necessary security checks.
+ * You can specify:
+ * - the exact hostname of your host or virtual host, e.g. demo.example.org.
+ * - the exact hostname with permitted port, e.g. demo.example.org:443.
+ *   This disallows all other ports on this host
+ * - use * as a wildcard, e.g. ubos-raspberry-pi*.local will allow
+ *   ubos-raspberry-pi.local and ubos-raspberry-pi-2.local
  */
 'trusted_domains' =>
   array (

lib/private/Security/TrustedDomainHelper.php

@@ -70,21 +70,28 @@ public function isTrustedDomain($domainWithPort) {
 
 		// Read trusted domains from config
 		$trustedList = $this->config->getSystemValue('trusted_domains', []);
-		if(!is_array($trustedList)) {
+		if (!is_array($trustedList)) {
 			return false;
 		}
 
 		// Always allow access from localhost
 		if (preg_match(Request::REGEX_LOCALHOST, $domain) === 1) {
 			return true;
 		}
-
-		// Compare with port appended
-		if(in_array($domainWithPort, $trustedList, true)) {
-			return true;
+		// Reject misformed domains in any case
+		if (strpos($domain,'-') === 0 || strpos($domain,'..') !== false) {
+			return false;
 		}
-
-		return in_array($domain, $trustedList, true);
+		// Match, allowing for * wildcards
+		foreach ($trustedList as $trusted) {
+			if (gettype($trusted) !== 'string') {
+				break;
+			}
+			$regex = '/^' . join('[-\.a-zA-Z0-9]*', array_map(function($v) { return preg_quote($v, '/'); }, explode('*', $trusted))) . '$/';
+			if (preg_match($regex, $domain) || preg_match($regex, $domainWithPort)) {
+ 				return true;
+ 			}
+ 		}
+ 		return false;
 	}
-
 }

tests/lib/Security/TrustedDomainHelperTest.php

@@ -49,6 +49,11 @@ public function trustedDomainDataProvider() {
 			'host.two.test',
 			'[1fff:0:a88:85a3::ac1f]',
 			'host.three.test:443',
+			'*.leading.host',
+			'trailing.host*',
+			'cen*ter',
+			'*.leadingwith.port:123',
+			'trailingwith.port*:456',
 		];
 		return [
 			// empty defaults to false with 8.1
@@ -76,7 +81,31 @@ public function trustedDomainDataProvider() {
 			[$trustedHostTestList, 'localhost: evil.host', false],
 			// do not trust casting
 			[[1], '1', false],
+			// leading *
+			[$trustedHostTestList, 'abc.leading.host', true],
+			[$trustedHostTestList, 'abc.def.leading.host', true],
+			[$trustedHostTestList, 'abc.def.leading.host.another', false],
+			[$trustedHostTestList, 'abc.def.leading.host:123', true],
+			[$trustedHostTestList, 'leading.host', false],
+			// trailing *
+			[$trustedHostTestList, 'trailing.host', true],
+			[$trustedHostTestList, 'trailing.host.abc', true],
+			[$trustedHostTestList, 'trailing.host.abc.def', true],
+			[$trustedHostTestList, 'trailing.host.abc:123', true],
+			[$trustedHostTestList, 'another.trailing.host', false],
+			// center *
+			[$trustedHostTestList, 'center', true],
+			[$trustedHostTestList, 'cenxxxter', true],
+			[$trustedHostTestList, 'cen.x.y.ter', true],
+			// with port
+			[$trustedHostTestList, 'abc.leadingwith.port:123', true],
+			[$trustedHostTestList, 'abc.leadingwith.port:1234', false],
+			[$trustedHostTestList, 'trailingwith.port.abc:456', true],
+			[$trustedHostTestList, 'trailingwith.port.abc:123', false],
+			// bad hostname
+			[$trustedHostTestList, '-bad', false],
+			[$trustedHostTestList, '-bad.leading.host', false],
+			[$trustedHostTestList, 'bad..der.leading.host', false],
 		];
 	}
-
 }