- created encoding package

1 files changed, 446 insertions, 0 deletions

diff --git a/Source/charon/encoding/payloads/ike_header.c b/Source/charon/encoding/payloads/ike_header.c
new file mode 100644
index 000000000..1f1c34253
--- /dev/null
+++ b/Source/charon/encoding/payloads/ike_header.c
@@ -0,0 +1,446 @@
+/**
+ * @file ike_header.c
+ * 
+ * @brief Declaration of the class ike_header_t. 
+ * 
+ * An object of this type represents an ike header and is used to 
+ * generate and parse ike headers.
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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.
+ */
+
+/* offsetof macro */
+#include <stddef.h>
+
+#include "ike_header.h"
+
+#include <encoding/payloads/encodings.h>
+#include <utils/allocator.h>
+
+typedef struct private_ike_header_s private_ike_header_t;
+
+struct private_ike_header_s {
+	/**
+	 * public interface
+	 */
+	ike_header_t public;
+	
+	/**
+	 * SPI of the initiator
+	 */
+	u_int64_t initiator_spi;
+	/**
+	 * SPI of the responder
+	 */
+	u_int64_t responder_spi;
+	/**
+	 * next payload type
+	 */
+	u_int8_t  next_payload;
+	/**
+	 * IKE major version
+	 */
+	u_int8_t  maj_version;
+
+	/**
+	 * IKE minor version
+	 */	
+	u_int8_t  min_version;
+
+	/**
+	 * Exchange type 
+	 */	
+	u_int8_t  exchange_type;
+	
+	/**
+	 * Flags of the Message
+	 * 
+	 */
+	struct { 
+		/**
+		 * Sender is initiator of the associated IKE_SA_INIT-Exchange
+		 */
+		bool initiator;
+		/**
+		 * is protocol supporting higher version?
+		 */
+		bool version;
+		/**
+		 * TRUE, if this is a response, FALSE if its a Request
+		 */
+		bool response;
+	} flags;
+	/**
+	 * Associated Message-ID
+	 */
+	u_int32_t message_id;
+	/**
+	 * Length of the whole IKEv2-Message (header and all payloads)
+	 */
+	u_int32_t length;	
+}; 
+
+/**
+ * mappings used to get strings for exchange_type_t
+ */
+mapping_t exchange_type_m[] = {
+	{EXCHANGE_TYPE_UNDEFINED, "EXCHANGE_TYPE_UNDEFINED"},
+	{IKE_SA_INIT, "IKE_SA_INIT"},
+	{IKE_AUTH, "IKE_AUTH"},
+	{CREATE_CHILD_SA, "CREATE_CHILD_SA"},
+	{INFORMATIONAL, "INFORMATIONAL"}
+};
+
+
+/**
+ * Encoding rules to parse or generate a IKEv2-Header
+ * 
+ * The defined offsets are the positions in a object of type 
+ * ike_header_t.
+ * 
+ */
+encoding_rule_t ike_header_encodings[] = {
+ 	/* 8 Byte SPI, stored in the field initiator_spi */
+	{ IKE_SPI,		offsetof(private_ike_header_t, initiator_spi)	},
+ 	/* 8 Byte SPI, stored in the field responder_spi */
+	{ IKE_SPI,		offsetof(private_ike_header_t, responder_spi) 	},
+ 	/* 1 Byte next payload type, stored in the field next_payload */
+	{ U_INT_8,		offsetof(private_ike_header_t, next_payload) 	},
+ 	/* 4 Bit major version, stored in the field maj_version */
+	{ U_INT_4,		offsetof(private_ike_header_t, maj_version) 	},
+ 	/* 4 Bit minor version, stored in the field min_version */
+	{ U_INT_4,		offsetof(private_ike_header_t, min_version) 	},
+	/* 8 Bit for the exchange type */
+	{ U_INT_8,		offsetof(private_ike_header_t, exchange_type) 	},
+ 	/* 2 Bit reserved bits, nowhere stored */
+	{ RESERVED_BIT,	0 										}, 
+	{ RESERVED_BIT,	0 										}, 
+ 	/* 3 Bit flags, stored in the fields response, version and initiator */
+	{ FLAG,			offsetof(private_ike_header_t, flags.response) 	},	
+	{ FLAG,			offsetof(private_ike_header_t, flags.version) 	},
+	{ FLAG,			offsetof(private_ike_header_t, flags.initiator) },
+ 	/* 3 Bit reserved bits, nowhere stored */
+	{ RESERVED_BIT,	0 										},
+	{ RESERVED_BIT,	0 										},
+	{ RESERVED_BIT,	0 										},
+ 	/* 4 Byte message id, stored in the field message_id */
+	{ U_INT_32,		offsetof(private_ike_header_t, message_id) 		},
+ 	/* 4 Byte length fied, stored in the field length */
+	{ HEADER_LENGTH,	offsetof(private_ike_header_t, length) 			}
+};
+
+
+/*                           1                   2                   3
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !                       IKE_SA Initiator's SPI                  !
+      !                                                               !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !                       IKE_SA Responder's SPI                  !
+      !                                                               !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !                          Message ID                           !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !                            Length                             !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+
+/**
+ * Implements payload_t's verify function.
+ * See #payload_s.verify for description.
+ */
+static status_t verify(private_ike_header_t *this)
+{
+	if ((this->exchange_type < IKE_SA_INIT) || (this->exchange_type > INFORMATIONAL))
+	{
+		/* unsupported exchange type */
+		return FAILED;
+	}
+	if (this->initiator_spi == 0)
+	{
+		/* initiator spi not set */
+		return FAILED;
+	}
+	
+	if ((this->responder_spi == 0) && (!this->flags.initiator))
+	{
+		/* must be original initiator*/
+		return FAILED;
+	}
+
+	if ((this->responder_spi == 0) && (this->flags.response))
+	{
+		/* must be request*/
+		return FAILED;
+	}
+	
+	/* verification of version is not done in here */
+	
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's set_next_type function.
+ * See #payload_s.set_next_type for description.
+ */
+static status_t set_next_type(payload_t *this,payload_type_t type)
+{
+	((private_ike_header_t *)this)->next_payload = type;
+	return SUCCESS;
+}
+/**
+ * Implements ike_header_t's get_initiator_spi fuction.
+ * See #ike_header_t.get_initiator_spi  for description.
+ */
+static u_int64_t get_initiator_spi(private_ike_header_t *this)
+{
+	return this->initiator_spi;	
+}
+
+/**
+ * Implements ike_header_t's set_initiator_spi fuction.
+ * See #ike_header_t.set_initiator_spi  for description.
+ */
+static void set_initiator_spi(private_ike_header_t *this, u_int64_t initiator_spi)
+{
+	this->initiator_spi = initiator_spi;
+}
+
+/**
+ * Implements ike_header_t's get_responder_spi fuction.
+ * See #ike_header_t.get_responder_spi  for description.
+ */
+static u_int64_t get_responder_spi(private_ike_header_t *this)
+{
+	return this->responder_spi;	
+}
+
+/**
+ * Implements ike_header_t's set_responder_spi fuction.
+ * See #ike_header_t.set_responder_spi  for description.
+ */
+static void set_responder_spi(private_ike_header_t *this, u_int64_t responder_spi)
+{
+	this->responder_spi = responder_spi;
+}
+
+/**
+ * Implements ike_header_t's get_maj_version fuction.
+ * See #ike_header_t.get_maj_version  for description.
+ */
+static u_int8_t get_maj_version(private_ike_header_t *this)
+{
+	return this->maj_version;	
+}
+
+/**
+ * Implements ike_header_t's get_min_version fuction.
+ * See #ike_header_t.get_min_version  for description.
+ */
+static u_int8_t get_min_version(private_ike_header_t *this)
+{
+	return this->min_version;	
+}
+
+/**
+ * Implements ike_header_t's get_response_flag fuction.
+ * See #ike_header_t.get_response_flag  for description.
+ */
+static bool get_response_flag(private_ike_header_t *this)
+{
+	return this->flags.response;	
+}
+
+/**
+ * Implements ike_header_t's set_response_flag fuction.
+ * See #ike_header_t.set_response_flag  for description.
+ */
+static void set_response_flag(private_ike_header_t *this, bool response)
+{
+	this->flags.response = response;	
+}
+
+/**
+ * Implements ike_header_t's get_version_flag fuction.
+ * See #ike_header_t.get_version_flag  for description.
+ */
+static bool get_version_flag(private_ike_header_t *this)
+{
+	return this->flags.version;	
+}
+
+/**
+ * Implements ike_header_t's get_initiator_flag fuction.
+ * See #ike_header_t.get_initiator_flag  for description.
+ */
+static bool get_initiator_flag(private_ike_header_t *this)
+{
+	return this->flags.initiator;	
+}
+
+/**
+ * Implements ike_header_t's set_initiator_flag fuction.
+ * See #ike_header_t.set_initiator_flag  for description.
+ */
+static void set_initiator_flag(private_ike_header_t *this, bool initiator)
+{
+	this->flags.initiator = initiator;	
+}
+
+/**
+ * Implements ike_header_t's get_exchange_type function
+ * See #ike_header_t.get_exchange_type  for description.
+ */
+static u_int8_t get_exchange_type(private_ike_header_t *this)
+{
+	return this->exchange_type;	
+}
+
+/**
+ * Implements ike_header_t's set_exchange_type function.
+ * See #ike_header_t.set_exchange_type  for description.
+ */
+static void set_exchange_type(private_ike_header_t *this, u_int8_t exchange_type)
+{
+	this->exchange_type = exchange_type;	
+}
+
+/**
+ * Implements ike_header_t's get_message_id function.
+ * See #ike_header_t.get_message_id  for description.
+ */
+static u_int32_t get_message_id(private_ike_header_t *this)
+{
+	return this->message_id;	
+}
+
+/**
+ * Implements ike_header_t's set_message_id function.
+ * See #ike_header_t.set_message_id  for description.
+ */
+static void set_message_id(private_ike_header_t *this, u_int32_t message_id)
+{
+	this->message_id = message_id;
+}
+
+/**
+ * Implements payload_t's and ike_header_t's destroy function.
+ * See #payload_s.destroy or ike_header_s.destroy for description.
+ */
+static status_t destroy(ike_header_t *this)
+{
+	allocator_free(this);
+	
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_encoding_rules function.
+ * See #payload_s.get_encoding_rules for description.
+ */
+static status_t get_encoding_rules(payload_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+	*rules = ike_header_encodings;
+	*rule_count = sizeof(ike_header_encodings) / sizeof(encoding_rule_t);
+	
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_type function.
+ * See #payload_s.get_type for description.
+ */
+static payload_type_t get_type(payload_t *this)
+{
+	return HEADER;
+}
+
+/**
+ * Implements payload_t's get_next_type function.
+ * See #payload_s.get_next_type for description.
+ */
+static payload_type_t get_next_type(payload_t *this)
+{
+	return (((private_ike_header_t*)this)->next_payload);
+}
+
+/**
+ * Implements payload_t's get_length function.
+ * See #payload_s.get_length for description.
+ */
+static size_t get_length(payload_t *this)
+{
+	return (((private_ike_header_t*)this)->length);
+}
+
+/*
+ * Described in header
+ */
+ike_header_t *ike_header_create()
+{
+	private_ike_header_t *this = allocator_alloc_thing(private_ike_header_t);
+	if (this == NULL)
+	{
+		return NULL;	
+	}	
+	
+	this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
+	this->public.payload_interface.get_encoding_rules = get_encoding_rules;
+	this->public.payload_interface.get_length = get_length;
+	this->public.payload_interface.get_next_type = get_next_type;
+	this->public.payload_interface.set_next_type = set_next_type;
+	this->public.payload_interface.get_type = get_type;
+	this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
+	this->public.destroy = destroy;
+	
+	this->public.get_initiator_spi = (u_int64_t (*) (ike_header_t*))get_initiator_spi;
+	this->public.set_initiator_spi = (void (*) (ike_header_t*,u_int64_t))set_initiator_spi;
+	this->public.get_responder_spi = (u_int64_t (*) (ike_header_t*))get_responder_spi;
+	this->public.set_responder_spi = (void (*) (ike_header_t *,u_int64_t))set_responder_spi;
+	this->public.get_maj_version = (u_int8_t (*) (ike_header_t*))get_maj_version;
+	this->public.get_min_version = (u_int8_t (*) (ike_header_t*))get_min_version;
+	this->public.get_response_flag = (bool (*) (ike_header_t*))get_response_flag;
+	this->public.set_response_flag = (void (*) (ike_header_t*,bool))set_response_flag;
+	this->public.get_version_flag = (bool (*) (ike_header_t*))get_version_flag;
+	this->public.get_initiator_flag = (bool (*) (ike_header_t*))get_initiator_flag;
+	this->public.set_initiator_flag = (void (*) (ike_header_t*,bool))set_initiator_flag;
+	this->public.get_exchange_type = (u_int8_t (*) (ike_header_t*))get_exchange_type;
+	this->public.set_exchange_type = (void (*) (ike_header_t*,u_int8_t))set_exchange_type;
+	this->public.get_message_id = (u_int32_t (*) (ike_header_t*))get_message_id;
+	this->public.set_message_id = (void (*) (ike_header_t*,u_int32_t))set_message_id;
+	
+	/* set default values of the fields */
+	this->initiator_spi = 0;
+	this->responder_spi = 0;
+	this->next_payload = 0;
+	this->maj_version = IKE_MAJOR_VERSION;
+	this->min_version = IKE_MINOR_VERSION;
+	this->exchange_type = EXCHANGE_TYPE_UNDEFINED;
+	this->flags.initiator = TRUE;
+	this->flags.version = HIGHER_VERSION_SUPPORTED_FLAG;
+	this->flags.response = FALSE;
+	this->message_id = 0;
+	this->length = IKE_HEADER_LENGTH;
+	
+	
+	return (ike_header_t*)this;
+}
+
+