452 lines
12 KiB
C
452 lines
12 KiB
C
/**
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* @file ike_header.c
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*
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* @brief Declaration of the class ike_header_t.
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*
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* An object of this type represents an ike header and is used to
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* generate and parse ike headers.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* offsetof macro */
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#include <stddef.h>
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#include "ike_header.h"
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#include <encoding/payloads/encodings.h>
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#include <utils/allocator.h>
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typedef struct private_ike_header_t private_ike_header_t;
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/**
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* Private data of an ike_header_t Object
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*
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*/
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struct private_ike_header_t {
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/**
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* public interface
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*/
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ike_header_t public;
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/**
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* SPI of the initiator
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*/
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u_int64_t initiator_spi;
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/**
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* SPI of the responder
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*/
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u_int64_t responder_spi;
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/**
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* next payload type
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*/
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u_int8_t next_payload;
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/**
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* IKE major version
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*/
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u_int8_t maj_version;
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/**
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* IKE minor version
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*/
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u_int8_t min_version;
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/**
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* Exchange type
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*/
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u_int8_t exchange_type;
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/**
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* Flags of the Message
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*
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*/
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struct {
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/**
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* Sender is initiator of the associated IKE_SA_INIT-Exchange
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*/
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bool initiator;
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/**
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* is protocol supporting higher version?
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*/
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bool version;
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/**
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* TRUE, if this is a response, FALSE if its a Request
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*/
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bool response;
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} flags;
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/**
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* Associated Message-ID
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*/
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u_int32_t message_id;
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/**
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* Length of the whole IKEv2-Message (header and all payloads)
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*/
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u_int32_t length;
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};
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/**
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* mappings used to get strings for exchange_type_t
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*/
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mapping_t exchange_type_m[] = {
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{EXCHANGE_TYPE_UNDEFINED, "EXCHANGE_TYPE_UNDEFINED"},
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{IKE_SA_INIT, "IKE_SA_INIT"},
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{IKE_AUTH, "IKE_AUTH"},
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{CREATE_CHILD_SA, "CREATE_CHILD_SA"},
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{INFORMATIONAL, "INFORMATIONAL"}
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};
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/**
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* Encoding rules to parse or generate a IKEv2-Header
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*
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* The defined offsets are the positions in a object of type
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* ike_header_t.
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*
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*/
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encoding_rule_t ike_header_encodings[] = {
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/* 8 Byte SPI, stored in the field initiator_spi */
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{ IKE_SPI, offsetof(private_ike_header_t, initiator_spi) },
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/* 8 Byte SPI, stored in the field responder_spi */
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{ IKE_SPI, offsetof(private_ike_header_t, responder_spi) },
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_ike_header_t, next_payload) },
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/* 4 Bit major version, stored in the field maj_version */
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{ U_INT_4, offsetof(private_ike_header_t, maj_version) },
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/* 4 Bit minor version, stored in the field min_version */
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{ U_INT_4, offsetof(private_ike_header_t, min_version) },
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/* 8 Bit for the exchange type */
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{ U_INT_8, offsetof(private_ike_header_t, exchange_type) },
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/* 2 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* 3 Bit flags, stored in the fields response, version and initiator */
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{ FLAG, offsetof(private_ike_header_t, flags.response) },
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{ FLAG, offsetof(private_ike_header_t, flags.version) },
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{ FLAG, offsetof(private_ike_header_t, flags.initiator) },
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/* 3 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* 4 Byte message id, stored in the field message_id */
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{ U_INT_32, offsetof(private_ike_header_t, message_id) },
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/* 4 Byte length fied, stored in the field length */
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{ HEADER_LENGTH, offsetof(private_ike_header_t, length) }
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};
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/* 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! IKE_SA Initiator's SPI !
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! IKE_SA Responder's SPI !
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Next Payload ! MjVer ! MnVer ! Exchange Type ! Flags !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Message ID !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Implements payload_t's verify function.
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* See #payload_s.verify for description.
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*/
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static status_t verify(private_ike_header_t *this)
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{
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if ((this->exchange_type < IKE_SA_INIT) || (this->exchange_type > INFORMATIONAL))
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{
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/* unsupported exchange type */
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return FAILED;
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}
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if (this->initiator_spi == 0)
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{
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/* initiator spi not set */
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return FAILED;
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}
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if ((this->responder_spi == 0) && (!this->flags.initiator))
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{
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/* must be original initiator*/
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return FAILED;
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}
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if ((this->responder_spi == 0) && (this->flags.response))
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{
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/* must be request*/
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return FAILED;
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}
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/* verification of version is not done in here */
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return SUCCESS;
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}
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/**
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* Implements payload_t's set_next_type function.
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* See #payload_s.set_next_type for description.
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*/
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static status_t set_next_type(payload_t *this,payload_type_t type)
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{
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((private_ike_header_t *)this)->next_payload = type;
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return SUCCESS;
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}
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/**
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* Implements ike_header_t's get_initiator_spi fuction.
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* See #ike_header_t.get_initiator_spi for description.
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*/
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static u_int64_t get_initiator_spi(private_ike_header_t *this)
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{
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return this->initiator_spi;
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}
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/**
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* Implements ike_header_t's set_initiator_spi fuction.
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* See #ike_header_t.set_initiator_spi for description.
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*/
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static void set_initiator_spi(private_ike_header_t *this, u_int64_t initiator_spi)
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{
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this->initiator_spi = initiator_spi;
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}
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/**
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* Implements ike_header_t's get_responder_spi fuction.
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* See #ike_header_t.get_responder_spi for description.
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*/
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static u_int64_t get_responder_spi(private_ike_header_t *this)
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{
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return this->responder_spi;
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}
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/**
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* Implements ike_header_t's set_responder_spi fuction.
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* See #ike_header_t.set_responder_spi for description.
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*/
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static void set_responder_spi(private_ike_header_t *this, u_int64_t responder_spi)
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{
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this->responder_spi = responder_spi;
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}
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/**
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* Implements ike_header_t's get_maj_version fuction.
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* See #ike_header_t.get_maj_version for description.
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*/
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static u_int8_t get_maj_version(private_ike_header_t *this)
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{
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return this->maj_version;
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}
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/**
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* Implements ike_header_t's get_min_version fuction.
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* See #ike_header_t.get_min_version for description.
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*/
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static u_int8_t get_min_version(private_ike_header_t *this)
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{
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return this->min_version;
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}
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/**
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* Implements ike_header_t's get_response_flag fuction.
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* See #ike_header_t.get_response_flag for description.
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*/
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static bool get_response_flag(private_ike_header_t *this)
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{
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return this->flags.response;
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}
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/**
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* Implements ike_header_t's set_response_flag fuction.
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* See #ike_header_t.set_response_flag for description.
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*/
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static void set_response_flag(private_ike_header_t *this, bool response)
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{
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this->flags.response = response;
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}
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/**
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* Implements ike_header_t's get_version_flag fuction.
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* See #ike_header_t.get_version_flag for description.
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*/
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static bool get_version_flag(private_ike_header_t *this)
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{
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return this->flags.version;
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}
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/**
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* Implements ike_header_t's get_initiator_flag fuction.
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* See #ike_header_t.get_initiator_flag for description.
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*/
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static bool get_initiator_flag(private_ike_header_t *this)
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{
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return this->flags.initiator;
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}
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/**
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* Implements ike_header_t's set_initiator_flag fuction.
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* See #ike_header_t.set_initiator_flag for description.
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*/
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static void set_initiator_flag(private_ike_header_t *this, bool initiator)
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{
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this->flags.initiator = initiator;
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}
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/**
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* Implements ike_header_t's get_exchange_type function
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* See #ike_header_t.get_exchange_type for description.
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*/
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static u_int8_t get_exchange_type(private_ike_header_t *this)
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{
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return this->exchange_type;
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}
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/**
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* Implements ike_header_t's set_exchange_type function.
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* See #ike_header_t.set_exchange_type for description.
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*/
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static void set_exchange_type(private_ike_header_t *this, u_int8_t exchange_type)
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{
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this->exchange_type = exchange_type;
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}
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/**
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* Implements ike_header_t's get_message_id function.
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* See #ike_header_t.get_message_id for description.
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*/
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static u_int32_t get_message_id(private_ike_header_t *this)
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{
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return this->message_id;
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}
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/**
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* Implements ike_header_t's set_message_id function.
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* See #ike_header_t.set_message_id for description.
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*/
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static void set_message_id(private_ike_header_t *this, u_int32_t message_id)
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{
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this->message_id = message_id;
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}
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/**
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* Implements payload_t's and ike_header_t's destroy function.
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* See #payload_s.destroy or ike_header_s.destroy for description.
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*/
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static status_t destroy(ike_header_t *this)
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{
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allocator_free(this);
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return SUCCESS;
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}
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/**
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* Implements payload_t's get_encoding_rules function.
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* See #payload_s.get_encoding_rules for description.
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*/
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static status_t get_encoding_rules(payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = ike_header_encodings;
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*rule_count = sizeof(ike_header_encodings) / sizeof(encoding_rule_t);
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return SUCCESS;
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}
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/**
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* Implements payload_t's get_type function.
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* See #payload_s.get_type for description.
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*/
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static payload_type_t get_type(payload_t *this)
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{
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return HEADER;
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}
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/**
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* Implements payload_t's get_next_type function.
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* See #payload_s.get_next_type for description.
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*/
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static payload_type_t get_next_type(payload_t *this)
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{
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return (((private_ike_header_t*)this)->next_payload);
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}
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/**
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* Implements payload_t's get_length function.
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* See #payload_s.get_length for description.
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*/
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static size_t get_length(payload_t *this)
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{
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return (((private_ike_header_t*)this)->length);
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}
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/*
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* Described in header
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*/
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ike_header_t *ike_header_create()
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{
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private_ike_header_t *this = allocator_alloc_thing(private_ike_header_t);
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if (this == NULL)
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{
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return NULL;
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}
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this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
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this->public.payload_interface.get_encoding_rules = get_encoding_rules;
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this->public.payload_interface.get_length = get_length;
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this->public.payload_interface.get_next_type = get_next_type;
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this->public.payload_interface.set_next_type = set_next_type;
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this->public.payload_interface.get_type = get_type;
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this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
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this->public.destroy = destroy;
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this->public.get_initiator_spi = (u_int64_t (*) (ike_header_t*))get_initiator_spi;
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this->public.set_initiator_spi = (void (*) (ike_header_t*,u_int64_t))set_initiator_spi;
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this->public.get_responder_spi = (u_int64_t (*) (ike_header_t*))get_responder_spi;
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this->public.set_responder_spi = (void (*) (ike_header_t *,u_int64_t))set_responder_spi;
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this->public.get_maj_version = (u_int8_t (*) (ike_header_t*))get_maj_version;
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this->public.get_min_version = (u_int8_t (*) (ike_header_t*))get_min_version;
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this->public.get_response_flag = (bool (*) (ike_header_t*))get_response_flag;
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this->public.set_response_flag = (void (*) (ike_header_t*,bool))set_response_flag;
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this->public.get_version_flag = (bool (*) (ike_header_t*))get_version_flag;
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this->public.get_initiator_flag = (bool (*) (ike_header_t*))get_initiator_flag;
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this->public.set_initiator_flag = (void (*) (ike_header_t*,bool))set_initiator_flag;
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this->public.get_exchange_type = (u_int8_t (*) (ike_header_t*))get_exchange_type;
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this->public.set_exchange_type = (void (*) (ike_header_t*,u_int8_t))set_exchange_type;
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this->public.get_message_id = (u_int32_t (*) (ike_header_t*))get_message_id;
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this->public.set_message_id = (void (*) (ike_header_t*,u_int32_t))set_message_id;
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/* set default values of the fields */
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this->initiator_spi = 0;
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this->responder_spi = 0;
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this->next_payload = 0;
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this->maj_version = IKE_MAJOR_VERSION;
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this->min_version = IKE_MINOR_VERSION;
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this->exchange_type = EXCHANGE_TYPE_UNDEFINED;
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this->flags.initiator = TRUE;
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this->flags.version = HIGHER_VERSION_SUPPORTED_FLAG;
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this->flags.response = FALSE;
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this->message_id = 0;
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this->length = IKE_HEADER_LENGTH;
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return (ike_header_t*)this;
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}
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