tls: localhost is valid against identity-check

lib/tls.js

@@ -85,10 +85,6 @@ function checkServerIdentity(host, cert) {
     // Add trailing dot (make hostnames uniform)
     if (!/\.$/.test(host)) host += '.';
 
-    // Host names with less than one dots are considered too broad,
-    // and should not be allowed
-    if (!/^.+\..+$/.test(host)) return /$./;
-
     // The same applies to hostname with more than one wildcard,
     // if hostname has wildcard when wildcards are not allowed,
     // or if there are less than two dots after wildcard (i.e. *.com or *d.com)

test/simple/test-tls-check-server-identity.js

@@ -180,6 +180,13 @@ var tests = [
     },
     result: false
   },
+  {
+    host: 'localhost', cert: {
+      subjectaltname: 'DNS:a.com',
+      subject: { CN: 'localhost' }
+    },
+    result: true
+  },
 ];
 
 tests.forEach(function(test, i) {