use default sshd_config on windows also

lib/ssh.js

@@ -42,9 +42,13 @@ function sshAllowsPassword(user) {
 
 module.exports.checkSecurity = function () {
   var conf = {};
-  var sshdConf = '/etc/ssh/sshd_config';
   var noRootPasswordRe = /(?:^|[\r\n]+)\s*PermitRootLogin\s+(prohibit-password|without-password|no)\s*/i;
   var noPasswordRe = /(?:^|[\r\n]+)\s*PasswordAuthentication\s+(no)\s*/i;
+  var sshdConf = '/etc/ssh/sshd_config';
+  if (/^win/i.test(process.platform)) {
+    // TODO use %PROGRAMDATA%\ssh\sshd_config
+    sshdConf = 'C:\\ProgramData\\ssh\\sshd_config';
+  }
   return readFile(sshdConf, null).then(function (sshd) {
     sshd = sshd.toString('utf8');
     var match;