Merge branch 'custom-crypto'

This provides plugins with an interface to register keywords for
proposals (e.g. when parsing the esp and ike options from ipsec.conf)
and the possibility to register identifiers for kernel algorithms.

It is based on patches contributed by Nanoteq Pty Ltd.

1 files changed, 124 insertions, 1 deletions

diff --git a/src/libhydra/kernel/kernel_interface.c b/src/libhydra/kernel/kernel_interface.c
index 650cb1e9e..0ee5e1a55 100644
--- a/src/libhydra/kernel/kernel_interface.c
+++ b/src/libhydra/kernel/kernel_interface.c
@@ -15,6 +15,28 @@
  * for more details.
  */
 
+/*
+ * Copyright (c) 2012 Nanoteq Pty Ltd
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
 #include "kernel_interface.h"
 
 #include <debug.h>
@@ -23,6 +45,34 @@
 
 typedef struct private_kernel_interface_t private_kernel_interface_t;
 
+typedef struct kernel_algorithm_t kernel_algorithm_t;
+
+/**
+ * Mapping of IKE algorithms to kernel-specific algorithm identifiers
+ */
+struct kernel_algorithm_t {
+
+	/**
+	 * Transform type of the algorithm
+	 */
+	transform_type_t type;
+
+	/**
+	 * Identifier specified in IKE
+	 */
+	u_int16_t ike;
+
+	/**
+	 * Identifier as defined in pfkeyv2.h
+	 */
+	u_int16_t kernel;
+
+	/**
+	 * Name of the algorithm in linux crypto API
+	 */
+	char *name;
+};
+
 /**
  * Private data of a kernel_interface_t object.
  */
@@ -62,6 +112,16 @@ struct private_kernel_interface_t {
 	 * list of registered listeners
 	 */
 	linked_list_t *listeners;
+
+	/**
+	 * mutex for algorithm mappings
+	 */
+	mutex_t *mutex_algs;
+
+	/**
+	 * List of algorithm mappings (kernel_algorithm_t*)
+	 */
+	linked_list_t *algorithms;
 };
 
 METHOD(kernel_interface_t, get_spi, status_t,
@@ -510,13 +570,72 @@ METHOD(kernel_interface_t, roam, void,
 	this->mutex->unlock(this->mutex);
 }
 
+METHOD(kernel_interface_t, register_algorithm, void,
+	private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
+	u_int16_t kernel_id, char *kernel_name)
+{
+	kernel_algorithm_t *algorithm;
+
+	INIT(algorithm,
+		.type = type,
+		.ike = alg_id,
+		.kernel = kernel_id,
+		.name = strdup(kernel_name),
+	);
+
+	this->mutex_algs->lock(this->mutex_algs);
+	this->algorithms->insert_first(this->algorithms, algorithm);
+	this->mutex_algs->unlock(this->mutex_algs);
+}
+
+METHOD(kernel_interface_t, lookup_algorithm, bool,
+	private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
+	u_int16_t *kernel_id, char **kernel_name)
+{
+	kernel_algorithm_t *algorithm;
+	enumerator_t *enumerator;
+	bool found = FALSE;
+
+	this->mutex_algs->lock(this->mutex_algs);
+	enumerator = this->algorithms->create_enumerator(this->algorithms);
+	while (enumerator->enumerate(enumerator, &algorithm))
+	{
+		if (algorithm->type == type && algorithm->ike == alg_id)
+		{
+			if (kernel_id)
+			{
+				*kernel_id = algorithm->kernel;
+			}
+			if (kernel_name)
+			{
+				*kernel_name = algorithm->name;
+			}
+			found = TRUE;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex_algs->unlock(this->mutex_algs);
+	return found;
+}
+
 METHOD(kernel_interface_t, destroy, void,
 	private_kernel_interface_t *this)
 {
+	kernel_algorithm_t *algorithm;
+
+	while (this->algorithms->remove_first(this->algorithms,
+										 (void**)&algorithm) == SUCCESS)
+	{
+		free(algorithm->name);
+		free(algorithm);
+	}
+	this->algorithms->destroy(this->algorithms);
+	this->mutex_algs->destroy(this->mutex_algs);
 	DESTROY_IF(this->ipsec);
 	DESTROY_IF(this->net);
-	this->mutex->destroy(this->mutex);
 	this->listeners->destroy(this->listeners);
+	this->mutex->destroy(this->mutex);
 	free(this);
 }
 
@@ -559,6 +678,8 @@ kernel_interface_t *kernel_interface_create()
 
 			.add_listener = _add_listener,
 			.remove_listener = _remove_listener,
+			.register_algorithm = _register_algorithm,
+			.lookup_algorithm = _lookup_algorithm,
 			.acquire = _acquire,
 			.expire = _expire,
 			.mapping = _mapping,
@@ -568,6 +689,8 @@ kernel_interface_t *kernel_interface_create()
 		},
 		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
 		.listeners = linked_list_create(),
+		.mutex_algs = mutex_create(MUTEX_TYPE_DEFAULT),
+		.algorithms = linked_list_create(),
 	);
 
 	return &this->public;