264 lines
7.1 KiB
C
264 lines
7.1 KiB
C
/*
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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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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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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uint8_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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* Reserved bits
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*/
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bool reserved_bit[7];
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/**
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* Reserved bytes
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*/
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uint8_t reserved_byte[2];
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/**
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* Length of this payload.
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*/
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uint16_t payload_length;
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/**
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* DH Group Number.
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*/
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uint16_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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* Payload type, PLV2_KEY_EXCHANGE or PLV1_KEY_EXCHANGE
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*/
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payload_type_t type;
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};
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/**
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* Encoding rules for IKEv2 key exchange payload.
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*/
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static encoding_rule_t encodings_v2[] = {
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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 */
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[0]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[1]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[2]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[3]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[4]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[5]) },
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{ RESERVED_BIT, offsetof(private_ke_payload_t, reserved_bit[6]) },
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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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/* 2 reserved bytes */
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{ RESERVED_BYTE, offsetof(private_ke_payload_t, reserved_byte[0])},
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{ RESERVED_BYTE, offsetof(private_ke_payload_t, reserved_byte[1])},
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/* Key Exchange Data is from variable size */
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{ CHUNK_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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static encoding_rule_t encodings_v1[] = {
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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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/* Reserved Byte */
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{ RESERVED_BYTE, offsetof(private_ke_payload_t, reserved_byte[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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/* Key Exchange Data is from variable size */
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{ CHUNK_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 ! RESERVED ! Payload Length !
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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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METHOD(payload_t, verify, status_t,
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private_ke_payload_t *this)
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{
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return SUCCESS;
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}
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METHOD(payload_t, get_encoding_rules, int,
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private_ke_payload_t *this, encoding_rule_t **rules)
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{
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if (this->type == PLV2_KEY_EXCHANGE)
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{
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*rules = encodings_v2;
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return countof(encodings_v2);
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}
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*rules = encodings_v1;
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return countof(encodings_v1);
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}
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METHOD(payload_t, get_header_length, int,
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private_ke_payload_t *this)
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{
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if (this->type == PLV2_KEY_EXCHANGE)
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{
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return 8;
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}
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return 4;
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}
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METHOD(payload_t, get_type, payload_type_t,
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private_ke_payload_t *this)
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{
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return this->type;
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}
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METHOD(payload_t, get_next_type, payload_type_t,
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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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METHOD(payload_t, set_next_type, void,
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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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METHOD(payload_t, get_length, size_t,
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private_ke_payload_t *this)
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{
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return this->payload_length;
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}
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METHOD(ke_payload_t, get_key_exchange_data, chunk_t,
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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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METHOD(ke_payload_t, get_dh_group_number, diffie_hellman_group_t,
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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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METHOD2(payload_t, ke_payload_t, destroy, void,
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private_ke_payload_t *this)
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{
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free(this->key_exchange_data.ptr);
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free(this);
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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(payload_type_t type)
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{
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private_ke_payload_t *this;
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INIT(this,
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.public = {
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.payload_interface = {
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.verify = _verify,
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.get_encoding_rules = _get_encoding_rules,
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.get_header_length = _get_header_length,
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.get_length = _get_length,
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.get_next_type = _get_next_type,
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.set_next_type = _set_next_type,
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.get_type = _get_type,
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.destroy = _destroy,
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},
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.get_key_exchange_data = _get_key_exchange_data,
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.get_dh_group_number = _get_dh_group_number,
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.destroy = _destroy,
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},
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.next_payload = PL_NONE,
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.dh_group_number = MODP_NONE,
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.type = type,
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);
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this->payload_length = get_header_length(this);
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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(payload_type_t type,
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diffie_hellman_t *dh)
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{
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private_ke_payload_t *this;
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chunk_t value;
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if (!dh->get_my_public_value(dh, &value))
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{
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return NULL;
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}
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this = (private_ke_payload_t*)ke_payload_create(type);
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this->key_exchange_data = value;
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this->dh_group_number = dh->get_dh_group(dh);
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this->payload_length += this->key_exchange_data.len;
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return &this->public;
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}
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