sshd fixed to now take ___domain\user format for ___domain user login

___domain\user form now works. user@___domain format already worked but now
fixd to allow local machine name as the ___domain name also. So all these
formats now work:
For a ___domain acct: user OR ___domain\user  OR user@___domain
For a local acct:  user OR localmachinename\user OR
user@localmachinename
Note: public key logon still only works for a local user acct and the
localmachinename must not be given and only the username specified for
public key logon to work.

Author: quamrulmina

auth-passwd.c

@@ -223,8 +223,65 @@ int sys_auth_passwd(Authctxt *authctxt, const char *password)
   /*
    * Identify ___domain or local login.
    */
-   
-  domain_UTF16 = strchr(authctxt -> user, '@') ? NULL : L".";
+
+  char *username = authctxt->user;
+
+  char *domainslash = strchr(authctxt->user, '\\');
+  if (domainslash) {
+	  // ___domain\username format
+	  char *domainname = authctxt->user;
+	  *domainslash = '\0';
+	  username = ++domainslash; // username is past the ___domain \ is the username
+
+ 	  // Convert domainname from UTF-8 to UTF-16
+	  buffer_size = MultiByteToWideChar(CP_UTF8, 0, domainname, -1, NULL, 0);
+
+	  if (buffer_size > 0)
+	  {
+		  domain_UTF16 = xmalloc(4 * buffer_size);
+	  }
+	  else
+	  {
+		  return 0;
+	  }
+
+	  if (0 == MultiByteToWideChar(CP_UTF8, 0, domainname,
+		  -1, domain_UTF16, buffer_size))
+	  {
+		  free(domain_UTF16);
+
+		  return 0;
+	  }
+  }
+  else if (domainslash = strchr(authctxt->user, '@')) {
+	  // username@___domain format
+	  username = authctxt->user;
+	  *domainslash = '\0';
+	  char *domainname = ++domainslash; // domainname is past the user@
+
+								// Convert domainname from UTF-8 to UTF-16
+	  buffer_size = MultiByteToWideChar(CP_UTF8, 0, domainname, -1, NULL, 0);
+
+	  if (buffer_size > 0)
+	  {
+		  domain_UTF16 = xmalloc(4 * buffer_size);
+	  }
+	  else
+	  {
+		  return 0;
+	  }
+
+	  if (0 == MultiByteToWideChar(CP_UTF8, 0, domainname,
+		  -1, domain_UTF16, buffer_size))
+	  {
+		  free(domain_UTF16);
+
+		  return 0;
+	  }
+  }
+  else {
+	  domain_UTF16 = strchr(authctxt->user, '@') ? NULL : L".";
+  }
 
   authctxt -> methoddata = hToken;
 
@@ -237,7 +294,7 @@ int sys_auth_passwd(Authctxt *authctxt, const char *password)
    * Convert username from UTF-8 to UTF-16
    */
 
-  buffer_size = MultiByteToWideChar(CP_UTF8, 0, authctxt -> user, -1, NULL, 0);
+  buffer_size = MultiByteToWideChar(CP_UTF8, 0, username, -1, NULL, 0);
 
   if (buffer_size > 0)
   {
@@ -248,7 +305,7 @@ int sys_auth_passwd(Authctxt *authctxt, const char *password)
     return 0;
   }
 
-  if (0 == MultiByteToWideChar(CP_UTF8, 0, authctxt -> user,
+  if (0 == MultiByteToWideChar(CP_UTF8, 0, username,
                                    -1, user_UTF16, buffer_size))
   {
     free(user_UTF16);
@@ -296,7 +353,7 @@ int sys_auth_passwd(Authctxt *authctxt, const char *password)
     HANDLE weakToken = INVALID_HANDLE_VALUE;
 
     debug3("Netork login attemp [%s][%ls]...", 
-               authctxt -> user, domain_UTF16);
+               username, domain_UTF16);
 
     worked = LogonUserW(user_UTF16, domain_UTF16, password_UTF16,
                            LOGON32_LOGON_NETWORK,
@@ -314,6 +371,7 @@ int sys_auth_passwd(Authctxt *authctxt, const char *password)
 
   free(user_UTF16);
   free(password_UTF16);
+  if (domainslash) free(domain_UTF16);
 
   /*
    * If login still fails, go out.