271 lines
7.4 KiB
C
271 lines
7.4 KiB
C
/*
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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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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#include <stddef.h>
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#include "ke_payload.h"
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#include <encoding/payloads/encodings.h>
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typedef struct private_ke_payload_t private_ke_payload_t;
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/**
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* Private data of an ke_payload_t object.
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*
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*/
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struct private_ke_payload_t {
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/**
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* Public ke_payload_t interface.
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*/
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ke_payload_t public;
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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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* Critical flag.
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*/
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bool critical;
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/**
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* Length of this payload.
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*/
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u_int16_t payload_length;
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/**
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* DH Group Number.
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*/
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u_int16_t dh_group_number;
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/**
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* Key Exchange Data of this KE payload.
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*/
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chunk_t key_exchange_data;
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};
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/**
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* Encoding rules to parse or generate a IKEv2-KE Payload.
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*
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* The defined offsets are the positions in a object of type
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* private_ke_payload_t.
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*
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*/
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encoding_rule_t ke_payload_encodings[] = {
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_ke_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_ke_payload_t, critical) },
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/* 7 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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{ RESERVED_BIT, 0 },
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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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/* Length of the whole payload*/
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{ PAYLOAD_LENGTH, offsetof(private_ke_payload_t, payload_length) },
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/* DH Group number as 16 bit field*/
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{ U_INT_16, offsetof(private_ke_payload_t, dh_group_number) },
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{ RESERVED_BYTE, 0 },
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{ RESERVED_BYTE, 0 },
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/* Key Exchange Data is from variable size */
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{ KEY_EXCHANGE_DATA, offsetof(private_ke_payload_t, key_exchange_data)}
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};
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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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! Next Payload !C! RESERVED ! Payload Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! DH Group # ! RESERVED !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Key Exchange Data ~
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Implementation of payload_t.verify.
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*/
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static status_t verify(private_ke_payload_t *this)
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{
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/* dh group is not verified in here */
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return SUCCESS;
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}
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/**
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* Implementation of payload_t.destroy.
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*/
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static void destroy(private_ke_payload_t *this)
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{
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if (this->key_exchange_data.ptr != NULL)
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{
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free(this->key_exchange_data.ptr);
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}
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free(this);
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}
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/**
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* Implementation of payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_ke_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = ke_payload_encodings;
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*rule_count = sizeof(ke_payload_encodings) / sizeof(encoding_rule_t);
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}
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/**
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* Implementation of payload_t.get_type.
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*/
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static payload_type_t get_type(private_ke_payload_t *this)
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{
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return KEY_EXCHANGE;
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}
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/**
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* Implementation of payload_t.get_next_type.
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*/
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static payload_type_t get_next_type(private_ke_payload_t *this)
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{
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return (this->next_payload);
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}
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/**
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* Implementation of payload_t.set_next_type.
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*/
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static void set_next_type(private_ke_payload_t *this,payload_type_t type)
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{
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this->next_payload = type;
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}
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/**
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* recompute the length of the payload.
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*/
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static void compute_length(private_ke_payload_t *this)
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{
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size_t length = KE_PAYLOAD_HEADER_LENGTH;
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if (this->key_exchange_data.ptr != NULL)
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{
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length += this->key_exchange_data.len;
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}
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this->payload_length = length;
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}
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/**
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* Implementation of payload_t.get_length.
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*/
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static size_t get_length(private_ke_payload_t *this)
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{
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compute_length(this);
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return this->payload_length;
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}
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/**
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* Implementation of ke_payload_t.get_key_exchange_data.
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*/
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static chunk_t get_key_exchange_data(private_ke_payload_t *this)
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{
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return (this->key_exchange_data);
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}
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/**
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* Implementation of ke_payload_t.set_key_exchange_data.
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*/
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static void set_key_exchange_data(private_ke_payload_t *this, chunk_t key_exchange_data)
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{
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/* destroy existing data first */
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if (this->key_exchange_data.ptr != NULL)
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{
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/* free existing value */
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free(this->key_exchange_data.ptr);
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this->key_exchange_data.ptr = NULL;
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this->key_exchange_data.len = 0;
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}
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this->key_exchange_data = chunk_clone(key_exchange_data);
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compute_length(this);
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}
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/**
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* Implementation of ke_payload_t.get_dh_group_number.
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*/
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static diffie_hellman_group_t get_dh_group_number(private_ke_payload_t *this)
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{
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return this->dh_group_number;
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}
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/**
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* Implementation of ke_payload_t.set_dh_group_number.
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*/
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static void set_dh_group_number(private_ke_payload_t *this, diffie_hellman_group_t dh_group_number)
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{
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this->dh_group_number = dh_group_number;
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}
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/*
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* Described in header
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*/
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ke_payload_t *ke_payload_create()
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{
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private_ke_payload_t *this = malloc_thing(private_ke_payload_t);
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/* interface functions */
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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 = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
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this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
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this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
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this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
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/* public functions */
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this->public.get_key_exchange_data = (chunk_t (*) (ke_payload_t *)) get_key_exchange_data;
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this->public.set_key_exchange_data = (void (*) (ke_payload_t *,chunk_t)) set_key_exchange_data;
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this->public.get_dh_group_number = (diffie_hellman_group_t (*) (ke_payload_t *)) get_dh_group_number;
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this->public.set_dh_group_number =(void (*) (ke_payload_t *,diffie_hellman_group_t)) set_dh_group_number;
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this->public.destroy = (void (*) (ke_payload_t *)) destroy;
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/* set default values of the fields */
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this->critical = FALSE;
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this->next_payload = NO_PAYLOAD;
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this->payload_length = KE_PAYLOAD_HEADER_LENGTH;
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this->key_exchange_data = chunk_empty;
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this->dh_group_number = MODP_NONE;
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return &this->public;
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}
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/*
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* Described in header
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*/
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ke_payload_t *ke_payload_create_from_diffie_hellman(diffie_hellman_t *dh)
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{
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private_ke_payload_t *this = (private_ke_payload_t*)ke_payload_create();
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dh->get_my_public_value(dh, &this->key_exchange_data);
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this->dh_group_number = dh->get_dh_group(dh);
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compute_length(this);
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return &this->public;
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}
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