324 lines
9.0 KiB
C
324 lines
9.0 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 "transform_substructure.h"
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#include <encoding/payloads/transform_attribute.h>
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#include <encoding/payloads/encodings.h>
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#include <library.h>
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#include <collections/linked_list.h>
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#include <daemon.h>
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typedef struct private_transform_substructure_t private_transform_substructure_t;
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/**
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* Private data of an transform_substructure_t object.
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*/
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struct private_transform_substructure_t {
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/**
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* Public transform_substructure_t interface.
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*/
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transform_substructure_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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* Reserved byte
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*/
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uint8_t reserved[3];
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/**
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* Length of this payload.
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*/
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uint16_t transform_length;
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/**
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* Type or number, Type of the transform in IKEv2, number in IKEv2.
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*/
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uint8_t transform_ton;
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/**
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* Transform ID, as encoded in IKEv1.
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*/
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uint8_t transform_id_v1;
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/**
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* Transform ID, as encoded in IKEv2.
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*/
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uint16_t transform_id_v2;
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/**
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* Transforms Attributes are stored in a linked_list_t.
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*/
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linked_list_t *attributes;
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/**
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* Payload type, PLV2_TRANSFORM_SUBSTRUCTURE or PLV1_TRANSFORM_SUBSTRUCTURE
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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 PLV2_TRANSFORM_SUBSTRUCTURE
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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_transform_substructure_t, next_payload) },
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/* 1 Reserved Byte */
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{ RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[0]) },
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/* Length of the whole transform substructure*/
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{ PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length)},
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/* transform type */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_ton) },
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/* transform identifier, as used by IKEv1 */
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{ RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[1]) },
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/* transform identifier, as used by IKEv2 */
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{ U_INT_16, offsetof(private_transform_substructure_t, transform_id_v2) },
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/* Attributes in a transform attribute list */
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{ PAYLOAD_LIST + PLV2_TRANSFORM_ATTRIBUTE,
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offsetof(private_transform_substructure_t, attributes) }
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};
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/**
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* Encoding rules for PLV1_TRANSFORM_SUBSTRUCTURE
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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_transform_substructure_t, next_payload) },
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/* 1 Reserved Byte */
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{ RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[0]) },
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/* Length of the whole transform substructure*/
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{ PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length)},
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/* transform number */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_ton)},
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/* transform identifier, as used by IKEv1 */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_id_v1) },
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/* transform identifier, as used by IKEv2 */
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{ RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[1]) },
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{ RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[2]) },
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/* Attributes in a transform attribute list */
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{ PAYLOAD_LIST + PLV1_TRANSFORM_ATTRIBUTE,
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offsetof(private_transform_substructure_t, attributes) }
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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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! 0 (last) or 3 ! RESERVED ! Transform Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Tfrm Typ or # ! Tfrm ID IKEv1 ! Transform ID IKEv2 !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Transform Attributes ~
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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_transform_substructure_t *this)
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{
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status_t status = SUCCESS;
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enumerator_t *enumerator;
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payload_t *attribute;
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if (this->next_payload != PL_NONE && this->next_payload != 3)
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{
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DBG1(DBG_ENC, "inconsistent next payload");
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return FAILED;
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}
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enumerator = this->attributes->create_enumerator(this->attributes);
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while (enumerator->enumerate(enumerator, &attribute))
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{
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status = attribute->verify(attribute);
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if (status != SUCCESS)
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{
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DBG1(DBG_ENC, "TRANSFORM_ATTRIBUTE verification failed");
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break;
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}
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}
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enumerator->destroy(enumerator);
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/* proposal number is checked in SA payload */
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return status;
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}
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METHOD(payload_t, get_encoding_rules, int,
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private_transform_substructure_t *this, encoding_rule_t **rules)
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{
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if (this->type == PLV2_TRANSFORM_SUBSTRUCTURE)
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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_transform_substructure_t *this)
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{
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return 8;
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}
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METHOD(payload_t, get_type, payload_type_t,
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private_transform_substructure_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_transform_substructure_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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* recompute the length of the payload.
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*/
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static void compute_length(private_transform_substructure_t *this)
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{
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enumerator_t *enumerator;
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payload_t *attribute;
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this->transform_length = get_header_length(this);
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enumerator = this->attributes->create_enumerator(this->attributes);
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while (enumerator->enumerate(enumerator, &attribute))
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{
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this->transform_length += attribute->get_length(attribute);
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}
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enumerator->destroy(enumerator);
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}
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METHOD(payload_t, get_length, size_t,
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private_transform_substructure_t *this)
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{
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return this->transform_length;
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}
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METHOD(transform_substructure_t, add_transform_attribute, void,
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private_transform_substructure_t *this, transform_attribute_t *attribute)
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{
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this->attributes->insert_last(this->attributes, attribute);
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compute_length(this);
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}
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METHOD(transform_substructure_t, set_is_last_transform, void,
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private_transform_substructure_t *this, bool is_last)
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{
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this->next_payload = is_last ? 0: TRANSFORM_TYPE_VALUE;
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}
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METHOD(payload_t, set_next_type, void,
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private_transform_substructure_t *this,payload_type_t type)
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{
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}
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METHOD(transform_substructure_t, get_transform_type_or_number, uint8_t,
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private_transform_substructure_t *this)
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{
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return this->transform_ton;
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}
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METHOD(transform_substructure_t, get_transform_id, uint16_t,
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private_transform_substructure_t *this)
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{
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if (this->type == PLV2_TRANSFORM_SUBSTRUCTURE)
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{
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return this->transform_id_v2;
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}
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return this->transform_id_v1;
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}
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METHOD(transform_substructure_t, create_attribute_enumerator, enumerator_t*,
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private_transform_substructure_t *this)
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{
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return this->attributes->create_enumerator(this->attributes);
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}
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METHOD2(payload_t, transform_substructure_t, destroy, void,
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private_transform_substructure_t *this)
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{
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this->attributes->destroy_offset(this->attributes,
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offsetof(payload_t, destroy));
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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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transform_substructure_t *transform_substructure_create(payload_type_t type)
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{
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private_transform_substructure_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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.add_transform_attribute = _add_transform_attribute,
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.set_is_last_transform = _set_is_last_transform,
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.get_transform_type_or_number = _get_transform_type_or_number,
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.get_transform_id = _get_transform_id,
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.create_attribute_enumerator = _create_attribute_enumerator,
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.destroy = _destroy,
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},
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.next_payload = PL_NONE,
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.transform_length = get_header_length(this),
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.attributes = linked_list_create(),
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.type = type,
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);
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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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transform_substructure_t *transform_substructure_create_type(payload_type_t type,
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uint8_t type_or_number, uint16_t id)
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{
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private_transform_substructure_t *this;
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this = (private_transform_substructure_t*)transform_substructure_create(type);
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this->transform_ton = type_or_number;
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if (type == PLV2_TRANSFORM_SUBSTRUCTURE)
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{
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this->transform_id_v2 = id;
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}
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else
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{
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this->transform_id_v1 = id;
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}
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return &this->public;
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}
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