1 files changed, 260 insertions, 0 deletions
diff --git a/src/charon/sa/tasks/ike_cert_post.c b/src/charon/sa/tasks/ike_cert_post.c
new file mode 100644
index 000000000..184868b28
--- /dev/null
+++ b/src/charon/sa/tasks/ike_cert_post.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2006-2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.
+ *
+ * $Id: ike_cert_post.c 4051 2008-06-10 09:08:27Z tobias $
+ */
+
+#include "ike_cert_post.h"
+
+#include <daemon.h>
+#include <sa/ike_sa.h>
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/certreq_payload.h>
+#include <credentials/certificates/x509.h>
+
+
+typedef struct private_ike_cert_post_t private_ike_cert_post_t;
+
+/**
+ * Private members of a ike_cert_post_t task.
+ */
+struct private_ike_cert_post_t {
+	
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_cert_post_t public;
+	
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+	
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+};
+
+/**
+ * Generates the cert payload, if possible with "Hash and URL"
+ */
+static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this, certificate_t *cert)
+{
+	cert_payload_t *payload = NULL;
+	
+	if (this->ike_sa->supports_extension(this->ike_sa, EXT_HASH_AND_URL))
+	{
+		/* ok, our peer sent us a HTTP_CERT_LOOKUP_SUPPORTED Notify */
+		hasher_t *hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+		if (hasher != NULL)
+		{	
+			chunk_t hash, encoded = cert->get_encoding(cert);
+			enumerator_t *enumerator;
+			char *url;
+			
+			hasher->allocate_hash(hasher, encoded, &hash);
+			identification_t *id = identification_create_from_encoding(ID_CERT_DER_SHA1, hash);
+			
+			enumerator = charon->credentials->create_cdp_enumerator(charon->credentials, CERT_X509, id);
+			if (enumerator->enumerate(enumerator, &url))
+			{
+				/* if we have an URL available we send that to our peer */
+				payload = cert_payload_create_from_hash_and_url(hash, url);
+			}
+			enumerator->destroy(enumerator);
+			
+			id->destroy(id);
+			chunk_free(&hash);
+			chunk_free(&encoded);
+			hasher->destroy(hasher);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "unable to use hash-and-url: sha1 not supported");
+		}
+	}
+	
+	if (!payload)
+	{
+		/* our peer does not support "Hash and URL" or we do not have an URL
+		 * to send to our peer, just create a normal cert payload */
+		payload = cert_payload_create_from_cert(cert);
+	}
+	
+	return payload;
+}
+
+/**
+ * add certificates to message
+ */
+static void build_certs(private_ike_cert_post_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+	
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (peer_cfg && peer_cfg->get_auth_method(peer_cfg) == CONF_AUTH_PUBKEY)
+	{
+		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_info_t *auth;
+				auth_item_t item;
+				
+				auth = this->ike_sa->get_my_auth(this->ike_sa);
+				/* get subject cert first, then issuing certificates */
+				if (!auth->get_item(auth, AUTHZ_SUBJECT_CERT, (void**)&cert))
+				{
+					break;
+				}
+				payload = build_cert_payload(this, cert);
+				if (!payload)
+				{
+					break;
+				}
+				DBG1(DBG_IKE, "sending end entity cert \"%D\"",
+					 cert->get_subject(cert));
+				message->add_payload(message, (payload_t*)payload);
+				
+				enumerator = auth->create_item_enumerator(auth);
+				while (enumerator->enumerate(enumerator, &item, &cert))
+				{
+					if (item == AUTHZ_IM_CERT)
+					{
+						payload = cert_payload_create_from_cert(cert);
+						if (payload)
+						{
+							DBG1(DBG_IKE, "sending issuer cert \"%D\"",
+								 cert->get_subject(cert));
+							message->add_payload(message, (payload_t*)payload);
+						}
+					}
+				}
+				enumerator->destroy(enumerator);
+			}	
+		}
+	}
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_cert_post_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		return NEED_MORE;
+	}
+	build_certs(this, message);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_cert_post_t *this, message_t *message)
+{	
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_cert_post_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		return NEED_MORE;
+	}
+	build_certs(this, message);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_cert_post_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		return NEED_MORE;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_cert_post_t *this)
+{
+	return IKE_CERT_POST;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_cert_post_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_cert_post_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_cert_post_t *this = malloc_thing(private_ike_cert_post_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+	
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	
+	return &this->public;
+}
+