r5668: Add tests to RPC-SAMLOGON to test for user@REALM style logins. These

need a NULL domain (or a "" domain, except this breaks NTLMv2, and I
need to look into it a bit more).

Add support to the Samba4 server for these logins.  This will need
extension when we handle trusted domains as a DC, as it is a principal
name, not just another format for the username.

Andrew Bartlett

source/libcli/auth/smbencrypt.c

@@ -121,6 +121,14 @@ BOOL ntv2_owf_gen(const uint8_t owf[16],
 		return False;
 	}
 
+	if (!user_in) {
+		user_in = "";
+	}
+
+	if (!domain_in) {
+		domain_in = "";
+	}
+
 	user_in = strupper_talloc(mem_ctx, user_in);
 	if (user_in == NULL) {
 		talloc_free(mem_ctx);