From: Tobias Brunner <tobias@strongswan.org>
Date: Mon, 25 Jun 2018 10:07:50 +0000 (+0200)
Subject: ike-cert-pre: Support IKE_AUX exchange between IKE_SA_INIT and IKE_AUTH
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=8c54002cc75ab36c0e776c48022cdf28ca3e30de;p=thirdparty%2Fstrongswan.git

ike-cert-pre: Support IKE_AUX exchange between IKE_SA_INIT and IKE_AUTH

The first IKE_AUTH does not have MID 1 if that's the case.
---

diff --git a/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c b/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c
index 284e59bb15..8960901d4f 100644
--- a/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c
+++ b/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2008-2018 Tobias Brunner
  * Copyright (C) 2006-2009 Martin Willi
  * HSR Hochschule fuer Technik Rapperswil
  *
@@ -49,11 +49,6 @@ struct private_ike_cert_pre_t {
 	 * Do we accept HTTP certificate lookup requests
 	 */
 	bool do_http_lookup;
-
-	/**
-	 * whether this is the final authentication round
-	 */
-	bool final;
 };
 
 /**
@@ -468,24 +463,17 @@ static void build_certreqs(private_ike_cert_pre_t *this, message_t *message)
  */
 static bool final_auth(message_t *message)
 {
-	/* we check for an AUTH payload without a ANOTHER_AUTH_FOLLOWS notify */
-	if (message->get_payload(message, PLV2_AUTH) == NULL)
-	{
-		return FALSE;
-	}
-	if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS))
-	{
-		return FALSE;
-	}
-	return TRUE;
+	return message->get_payload(message, PLV2_AUTH) != NULL &&
+		   !message->get_notify(message, ANOTHER_AUTH_FOLLOWS);
 }
 
 METHOD(task_t, build_i, status_t,
 	private_ike_cert_pre_t *this, message_t *message)
 {
-	if (message->get_message_id(message) == 1)
+	if (message->get_exchange_type(message) == IKE_AUTH)
 	{	/* initiator sends CERTREQs in first IKE_AUTH */
 		build_certreqs(this, message);
+		this->public.task.build = (void*)return_need_more;
 	}
 	return NEED_MORE;
 }
@@ -493,12 +481,15 @@ METHOD(task_t, build_i, status_t,
 METHOD(task_t, process_r, status_t,
 	private_ike_cert_pre_t *this, message_t *message)
 {
-	if (message->get_exchange_type(message) != IKE_SA_INIT)
+	if (message->get_exchange_type(message) == IKE_AUTH)
 	{	/* handle certreqs/certs in any IKE_AUTH, just in case */
 		process_certreqs(this, message);
 		process_certs(this, message);
+		if (final_auth(message))
+		{
+			return SUCCESS;
+		}
 	}
-	this->final = final_auth(message);
 	return NEED_MORE;
 }
 
@@ -509,25 +500,26 @@ METHOD(task_t, build_r, status_t,
 	{
 		build_certreqs(this, message);
 	}
-	if (this->final)
-	{
-		return SUCCESS;
-	}
 	return NEED_MORE;
 }
 
 METHOD(task_t, process_i, status_t,
 	private_ike_cert_pre_t *this, message_t *message)
 {
-	if (message->get_exchange_type(message) == IKE_SA_INIT)
-	{
-		process_certreqs(this, message);
-	}
-	process_certs(this, message);
-
-	if (final_auth(message))
+	switch (message->get_exchange_type(message))
 	{
-		return SUCCESS;
+		case IKE_SA_INIT:
+			process_certreqs(this, message);
+			break;
+		case IKE_AUTH:
+			process_certs(this, message);
+			if (final_auth(message))
+			{
+				return SUCCESS;
+			}
+			break;
+		default:
+			break;
 	}
 	return NEED_MORE;
 }