Implemented post-authentication certificate handling for IKEv1

5 files changed, 407 insertions, 1 deletions

diff --git a/src/libcharon/Makefile.am b/src/libcharon/Makefile.am
index d36b5a506..d9e5a54b2 100644
--- a/src/libcharon/Makefile.am
+++ b/src/libcharon/Makefile.am
@@ -84,6 +84,7 @@ sa/tasks/ike_auth.c sa/tasks/ike_auth.h \
 sa/tasks/ike_cert_pre.c sa/tasks/ike_cert_pre.h \
 sa/tasks/ike_cert_post.c sa/tasks/ike_cert_post.h \
 sa/tasks/ike_cert_pre_v1.c sa/tasks/ike_cert_pre_v1.h \
+sa/tasks/ike_cert_post_v1.c sa/tasks/ike_cert_post_v1.h \
 sa/tasks/ike_config.c sa/tasks/ike_config.h \
 sa/tasks/ike_delete.c sa/tasks/ike_delete.h \
 sa/tasks/ike_dpd.c sa/tasks/ike_dpd.h \
diff --git a/src/libcharon/sa/ike_sa.c b/src/libcharon/sa/ike_sa.c
index 96cbcf10a..47aadc108 100644
--- a/src/libcharon/sa/ike_sa.c
+++ b/src/libcharon/sa/ike_sa.c
@@ -37,6 +37,7 @@
 #include <sa/tasks/ike_cert_pre.h>
 #include <sa/tasks/ike_cert_pre_v1.h>
 #include <sa/tasks/ike_cert_post.h>
+#include <sa/tasks/ike_cert_post_v1.h>
 #include <sa/tasks/ike_rekey.h>
 #include <sa/tasks/ike_reauth.h>
 #include <sa/tasks/ike_delete.h>
@@ -1127,6 +1128,8 @@ METHOD(ike_sa_t, initiate, status_t,
 			this->task_manager->queue_task(this->task_manager, task);
 			task = (task_t*)main_mode_create(&this->public, TRUE);
 			this->task_manager->queue_task(this->task_manager, task);
+			task = (task_t*)ike_cert_post_v1_create(&this->public, TRUE);
+			this->task_manager->queue_task(this->task_manager, task);
 			task = (task_t*)ike_natd_v1_create(&this->public, TRUE);
 			this->task_manager->queue_task(this->task_manager, task);
 		}
diff --git a/src/libcharon/sa/task_manager_v1.c b/src/libcharon/sa/task_manager_v1.c
index 0843db51e..3d8229c05 100755
--- a/src/libcharon/sa/task_manager_v1.c
+++ b/src/libcharon/sa/task_manager_v1.c
@@ -25,7 +25,7 @@
 #include <sa/tasks/ike_natd_v1.h>
 #include <sa/tasks/ike_vendor_v1.h>
 #include <sa/tasks/ike_cert_pre_v1.h>
-#include <sa/tasks/ike_cert_post.h>
+#include <sa/tasks/ike_cert_post_v1.h>
 #include <processing/jobs/retransmit_job.h>
 #include <processing/jobs/delete_ike_sa_job.h>
 
@@ -270,6 +270,7 @@ METHOD(task_manager_t, initiate, status_t,
 				if (activate_task(this, TASK_MAIN_MODE))
 				{
 					exchange = ID_PROT;
+					activate_task(this, TASK_IKE_CERT_POST_V1);
 					activate_task(this, TASK_IKE_NATD_V1);
 				}
 				break;
@@ -506,6 +507,8 @@ static status_t process_request(private_task_manager_t *this,
 				this->passive_tasks->insert_last(this->passive_tasks, task);
 				task = (task_t *)main_mode_create(this->ike_sa, FALSE);
 				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_cert_post_v1_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
 				task = (task_t *)ike_natd_v1_create(this->ike_sa, FALSE);
 				this->passive_tasks->insert_last(this->passive_tasks, task);
 				break;
diff --git a/src/libcharon/sa/tasks/ike_cert_post_v1.c b/src/libcharon/sa/tasks/ike_cert_post_v1.c
new file mode 100755
index 000000000..517f8c1bf
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_post_v1.c
@@ -0,0 +1,346 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_cert_post_v1.h"
+
+#include <daemon.h>
+#include <sa/ike_sa.h>
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/certreq_payload.h>
+#include <encoding/payloads/auth_payload.h>
+#include <encoding/payloads/sa_payload.h>
+#include <credentials/certificates/x509.h>
+
+
+typedef struct private_ike_cert_post_v1_t private_ike_cert_post_v1_t;
+
+/**
+ * Private members of a ike_cert_post_v1_t task.
+ */
+struct private_ike_cert_post_v1_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_cert_post_v1_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * States of ike cert pre
+	 */
+	enum {
+		CR_SA,
+		CR_KE,
+		CR_AUTH,
+	} state;
+};
+
+/**
+ * Check if we actually use certificates for authentication
+ */
+static bool use_certs(private_ike_cert_post_v1_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	bool use = FALSE;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == SECURITY_ASSOCIATION_V1)
+		{
+			sa_payload_t *sa_payload = (sa_payload_t*)payload;
+
+			switch (sa_payload->get_auth_method(sa_payload))
+			{
+				case AUTH_RSA:
+				case AUTH_XAUTH_INIT_RSA:
+				case AUTH_XAUTH_RESP_RSA:
+					use = TRUE;
+					break;
+				default:
+					break;
+			}
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	return use;
+}
+
+/**
+ * Add certificates to message
+ */
+static void build_certs(private_ike_cert_post_v1_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (!peer_cfg)
+	{
+		return;
+	}
+
+	switch (peer_cfg->get_cert_policy(peer_cfg))
+	{
+		case CERT_NEVER_SEND:
+			break;
+		case CERT_SEND_IF_ASKED:
+			if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN))
+			{
+				break;
+			}
+			/* FALL */
+		case CERT_ALWAYS_SEND:
+		{
+			cert_payload_t *payload;
+			enumerator_t *enumerator;
+			certificate_t *cert;
+			auth_rule_t type;
+			auth_cfg_t *auth;
+
+			auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+			cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
+			if (!cert)
+			{
+				break;
+			}
+			payload = cert_payload_create_from_cert(CERTIFICATE_V1, cert);
+			if (!payload)
+			{
+				break;
+			}
+			DBG1(DBG_IKE, "sending end entity cert \"%Y\"",
+				 cert->get_subject(cert));
+			message->add_payload(message, (payload_t*)payload);
+
+			enumerator = auth->create_enumerator(auth);
+			while (enumerator->enumerate(enumerator, &type, &cert))
+			{
+				if (type == AUTH_RULE_IM_CERT)
+				{
+					payload = cert_payload_create_from_cert(CERTIFICATE_V1, cert);
+					if (payload)
+					{
+						DBG1(DBG_IKE, "sending issuer cert \"%Y\"",
+							 cert->get_subject(cert));
+						message->add_payload(message, (payload_t*)payload);
+					}
+				}
+			}
+			enumerator->destroy(enumerator);
+		}
+	}
+}
+
+METHOD(task_t, build_i, status_t,
+	private_ike_cert_post_v1_t *this, message_t *message)
+{
+	switch (message->get_exchange_type(message))
+	{
+		case ID_PROT:
+			if (this->state == CR_AUTH)
+			{
+				build_certs(this, message);
+				return SUCCESS;
+			}
+			return NEED_MORE;
+		case AGGRESSIVE:
+			if (this->state == CR_AUTH)
+			{
+				build_certs(this, message);
+				return SUCCESS;
+			}
+			return NEED_MORE;
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, process_r, status_t,
+	private_ike_cert_post_v1_t *this, message_t *message)
+{
+	switch (message->get_exchange_type(message))
+	{
+		case ID_PROT:
+		{
+			switch (this->state)
+			{
+				case CR_SA:
+					if (!use_certs(this, message))
+					{
+						return SUCCESS;
+					}
+					return NEED_MORE;
+				case CR_KE:
+					return NEED_MORE;
+				case CR_AUTH:
+					return NEED_MORE;
+			}
+		}
+		case AGGRESSIVE:
+		{
+			switch (this->state)
+			{
+				case CR_SA:
+					if (!use_certs(this, message))
+					{
+						return SUCCESS;
+					}
+					return NEED_MORE;
+				case CR_AUTH:
+					return SUCCESS;
+				default:
+					return FAILED;
+			}
+		}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, build_r, status_t,
+	private_ike_cert_post_v1_t *this, message_t *message)
+{
+	switch (message->get_exchange_type(message))
+	{
+		case ID_PROT:
+			switch (this->state)
+			{
+				case CR_SA:
+					this->state = CR_KE;
+					return NEED_MORE;
+				case CR_KE:
+					this->state = CR_AUTH;
+					return NEED_MORE;
+				case CR_AUTH:
+					build_certs(this, message);
+					return SUCCESS;
+			}
+		case AGGRESSIVE:
+			switch (this->state)
+			{
+				case CR_SA:
+					build_certs(this, message);
+					this->state = CR_AUTH;
+					return NEED_MORE;
+				case CR_AUTH:
+					return SUCCESS;
+				default:
+					return FAILED;
+			}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, process_i, status_t,
+	private_ike_cert_post_v1_t *this, message_t *message)
+{
+	switch (message->get_exchange_type(message))
+	{
+		case ID_PROT:
+		{
+			switch (this->state)
+			{
+				case CR_SA:
+					if (!use_certs(this, message))
+					{
+						return SUCCESS;
+					}
+					this->state = CR_KE;
+					return NEED_MORE;
+				case CR_KE:
+					this->state = CR_AUTH;
+					return NEED_MORE;
+				case CR_AUTH:
+					return SUCCESS;
+				default:
+					return FAILED;
+			}
+			break;
+		}
+		case AGGRESSIVE:
+		{
+			if (!use_certs(this, message))
+			{
+				return SUCCESS;
+			}
+			return SUCCESS;
+		}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, get_type, task_type_t,
+	private_ike_cert_post_v1_t *this)
+{
+	return TASK_IKE_CERT_POST_V1;
+}
+
+METHOD(task_t, migrate, void,
+	private_ike_cert_post_v1_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+METHOD(task_t, destroy, void,
+	private_ike_cert_post_v1_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_cert_post_v1_t *ike_cert_post_v1_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_cert_post_v1_t *this;
+
+	INIT(this,
+		.public = {
+			.task = {
+				.get_type = _get_type,
+				.migrate = _migrate,
+				.destroy = _destroy,
+			},
+		},
+		.ike_sa = ike_sa,
+		.initiator = initiator,
+		.state = CR_SA,
+	);
+	if (initiator)
+	{
+		this->public.task.process = _process_i;
+		this->public.task.build = _build_i;
+	}
+	else
+	{
+		this->public.task.process = _process_r;
+		this->public.task.build = _build_r;
+	}
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_cert_post_v1.h b/src/libcharon/sa/tasks/ike_cert_post_v1.h
new file mode 100644
index 000000000..58b7aa78f
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_post_v1.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_cert_post_v1 ike_cert_post_v1
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_CERT_POST_V1_H_
+#define IKE_CERT_POST_V1_H_
+
+typedef struct ike_cert_post_v1_t ike_cert_post_v1_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * IKE_CERT_POST_V1, IKEv1 certificate processing after authentication.
+ */
+struct ike_cert_post_v1_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_cert_post_v1 task.
+ *
+ * The initiator parameter means the original initiator, not the initiator
+ * of the certificate request.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if task is the original initiator
+ * @return				ike_cert_post_v1 task to handle by the task_manager
+ */
+ike_cert_post_v1_t *ike_cert_post_v1_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_CERT_POST_V1_H_ @}*/