ike-auth: Send REDIRECT notify during IKE_AUTH if requested by providers

To prevent the creation of the CHILD_SA we set a condition on the
IKE_SA.  We also schedule a delete job in case the client does not
terminate the IKE_SA (which is a SHOULD in RFC 5685).

diff --git a/src/libcharon/sa/ikev2/tasks/ike_auth.c b/src/libcharon/sa/ikev2/tasks/ike_auth.c
index 2554496c191617d632d1b48dbe9e138934a38bb0..ddb92f1550936686e3d67cdd357640b26a06fe77 100644 (file)
--- a/src/libcharon/sa/ikev2/tasks/ike_auth.c
+++ b/src/libcharon/sa/ikev2/tasks/ike_auth.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2015 Tobias Brunner
  * Copyright (C) 2005-2009 Martin Willi
  * Copyright (C) 2005 Jan Hutter
  * Hochschule fuer Technik Rapperswil
@@ -25,6 +25,7 @@
 #include <encoding/payloads/eap_payload.h>
 #include <encoding/payloads/nonce_payload.h>
 #include <sa/ikev2/authenticators/eap_authenticator.h>
+#include <processing/jobs/delete_ike_sa_job.h>
 
 typedef struct private_ike_auth_t private_ike_auth_t;
 
@@ -685,6 +686,7 @@ METHOD(task_t, process_r, status_t,
 METHOD(task_t, build_r, status_t,
        private_ike_auth_t *this, message_t *message)
 {
+       identification_t *gateway;
        auth_cfg_t *cfg;
 
        if (message->get_exchange_type(message) == IKE_SA_INIT)
@@ -817,34 +819,56 @@ METHOD(task_t, build_r, status_t,
        {
                this->do_another_auth = FALSE;
        }
-       if (!this->do_another_auth && !this->expect_another_auth)
+       if (this->do_another_auth || this->expect_another_auth)
        {
-               if (charon->ike_sa_manager->check_uniqueness(charon->ike_sa_manager,
-                                                                                                        this->ike_sa, FALSE))
-               {
-                       DBG1(DBG_IKE, "cancelling IKE_SA setup due to uniqueness policy");
-                       charon->bus->alert(charon->bus, ALERT_UNIQUE_KEEP);
-                       message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
-                                                               chunk_empty);
-                       return FAILED;
-               }
-               if (!charon->bus->authorize(charon->bus, TRUE))
-               {
-                       DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, cancelling");
-                       goto peer_auth_failed;
-               }
-               DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
-                        this->ike_sa->get_name(this->ike_sa),
-                        this->ike_sa->get_unique_id(this->ike_sa),
-                        this->ike_sa->get_my_host(this->ike_sa),
-                        this->ike_sa->get_my_id(this->ike_sa),
-                        this->ike_sa->get_other_host(this->ike_sa),
-                        this->ike_sa->get_other_id(this->ike_sa));
-               this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
-               charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
-               return SUCCESS;
+               return NEED_MORE;
        }
-       return NEED_MORE;
+
+       if (charon->ike_sa_manager->check_uniqueness(charon->ike_sa_manager,
+                                                                                                this->ike_sa, FALSE))
+       {
+               DBG1(DBG_IKE, "cancelling IKE_SA setup due to uniqueness policy");
+               charon->bus->alert(charon->bus, ALERT_UNIQUE_KEEP);
+               message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+                                                       chunk_empty);
+               return FAILED;
+       }
+       if (!charon->bus->authorize(charon->bus, TRUE))
+       {
+               DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, cancelling");
+               goto peer_auth_failed;
+       }
+       if (this->ike_sa->supports_extension(this->ike_sa, EXT_IKE_REDIRECTION) &&
+               charon->redirect->redirect_on_auth(charon->redirect, this->ike_sa,
+                                                                                  &gateway))
+       {
+               delete_ike_sa_job_t *job;
+               chunk_t data;
+
+               DBG1(DBG_IKE, "redirecting peer to %Y", gateway);
+               data = redirect_data_create(gateway, chunk_empty);
+               message->add_notify(message, FALSE, REDIRECT, data);
+               gateway->destroy(gateway);
+               chunk_free(&data);
+               /* we use this condition to prevent the CHILD_SA from getting created */
+               this->ike_sa->set_condition(this->ike_sa, COND_REDIRECTED, TRUE);
+               /* if the peer does not delete the SA we do so after a while */
+               job = delete_ike_sa_job_create(this->ike_sa->get_id(this->ike_sa), TRUE);
+               lib->scheduler->schedule_job(lib->scheduler, (job_t*)job,
+                                               lib->settings->get_int(lib->settings,
+                                                       "%s.half_open_timeout", HALF_OPEN_IKE_SA_TIMEOUT,
+                                                       lib->ns));
+       }
+       DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+                this->ike_sa->get_name(this->ike_sa),
+                this->ike_sa->get_unique_id(this->ike_sa),
+                this->ike_sa->get_my_host(this->ike_sa),
+                this->ike_sa->get_my_id(this->ike_sa),
+                this->ike_sa->get_other_host(this->ike_sa),
+                this->ike_sa->get_other_id(this->ike_sa));
+       this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+       charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
+       return SUCCESS;
 
 peer_auth_failed:
        message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);