410 lines
12 KiB
C
410 lines
12 KiB
C
/**
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* @file transform_substructure.h
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*
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* @brief Implementation of transform_substructure_t.
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*
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*/
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/*
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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 "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 <types.h>
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#include <utils/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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*/
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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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u_int8_t next_payload;
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/**
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* Length of this payload.
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*/
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u_int16_t transform_length;
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/**
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* Type of the transform.
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*/
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u_int8_t transform_type;
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/**
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* Transform ID.
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*/
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u_int16_t transform_id;
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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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/**
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* Encoding rules to parse or generate a Transform substructure.
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*
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* The defined offsets are the positions in a object of type
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* private_transform_substructure_t.
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*
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*/
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encoding_rule_t transform_substructure_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_transform_substructure_t, next_payload) },
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/* Reserved Byte is skipped */
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{ RESERVED_BYTE, 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 is a number of 8 bit */
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{ U_INT_8, offsetof(private_transform_substructure_t, transform_type) },
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/* Reserved Byte is skipped */
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{ RESERVED_BYTE, 0 },
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/* tranform ID is a number of 8 bit */
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{ U_INT_16, offsetof(private_transform_substructure_t, transform_id) },
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/* Attributes are stored in a transform attribute,
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offset points to a linked_list_t pointer */
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{ TRANSFORM_ATTRIBUTES, 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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!Transform Type ! RESERVED ! Transform ID !
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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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/**
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* Implementation of payload_t.verify.
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*/
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static status_t verify(private_transform_substructure_t *this)
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{
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status_t status = SUCCESS;
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iterator_t *iterator;
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payload_t *current_attributes;
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if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 3))
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{
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/* must be 0 or 3 */
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DBG1(DBG_ENC, "inconsistent next payload");
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return FAILED;
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}
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switch (this->transform_type)
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{
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case ENCRYPTION_ALGORITHM:
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case PSEUDO_RANDOM_FUNCTION:
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case INTEGRITY_ALGORITHM:
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case DIFFIE_HELLMAN_GROUP:
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case EXTENDED_SEQUENCE_NUMBERS:
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/* we don't check transform ID, we want to reply
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* cleanly with NO_PROPOSAL_CHOSEN or so if we don't support it */
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break;
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default:
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{
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DBG1(DBG_ENC, "invalid transform type: %d", this->transform_type);
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return FAILED;
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}
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}
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iterator = this->attributes->create_iterator(this->attributes,TRUE);
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while(iterator->iterate(iterator, (void**)¤t_attributes))
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{
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status = current_attributes->verify(current_attributes);
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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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}
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}
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iterator->destroy(iterator);
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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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/**
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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_transform_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = transform_substructure_encodings;
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*rule_count = sizeof(transform_substructure_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_transform_substructure_t *this)
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{
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return TRANSFORM_SUBSTRUCTURE;
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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_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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iterator_t *iterator;
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payload_t *current_attribute;
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size_t length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
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iterator = this->attributes->create_iterator(this->attributes,TRUE);
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while (iterator->iterate(iterator, (void**)¤t_attribute))
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{
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length += current_attribute->get_length(current_attribute);
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}
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iterator->destroy(iterator);
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this->transform_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_transform_substructure_t *this)
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{
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compute_length(this);
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return this->transform_length;
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}
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/**
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* Implementation of transform_substructure_t.create_transform_attribute_iterator.
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*/
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static iterator_t *create_transform_attribute_iterator (private_transform_substructure_t *this,bool forward)
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{
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return this->attributes->create_iterator(this->attributes,forward);
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}
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/**
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* Implementation of transform_substructure_t.add_transform_attribute.
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*/
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static void add_transform_attribute (private_transform_substructure_t *this,transform_attribute_t *attribute)
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{
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this->attributes->insert_last(this->attributes,(void *) attribute);
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compute_length(this);
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}
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/**
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* Implementation of transform_substructure_t.set_is_last_transform.
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*/
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static void set_is_last_transform (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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/**
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* Implementation of transform_substructure_t.get_is_last_transform.
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*/
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static bool get_is_last_transform (private_transform_substructure_t *this)
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{
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return ((this->next_payload == TRANSFORM_TYPE_VALUE) ? FALSE : TRUE);
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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_transform_substructure_t *this,payload_type_t type)
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{
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}
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/**
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* Implementation of transform_substructure_t.set_transform_type.
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*/
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static void set_transform_type (private_transform_substructure_t *this,u_int8_t type)
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{
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this->transform_type = type;
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}
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/**
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* Implementation of transform_substructure_t.get_transform_type.
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*/
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static u_int8_t get_transform_type (private_transform_substructure_t *this)
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{
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return this->transform_type;
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}
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/**
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* Implementation of transform_substructure_t.set_transform_id.
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*/
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static void set_transform_id (private_transform_substructure_t *this,u_int16_t id)
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{
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this->transform_id = id;
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}
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/**
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* Implementation of transform_substructure_t.get_transform_id.
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*/
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static u_int16_t get_transform_id (private_transform_substructure_t *this)
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{
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return this->transform_id;
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}
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/**
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* Implementation of transform_substructure_t.clone.
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*/
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static transform_substructure_t *clone_(private_transform_substructure_t *this)
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{
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private_transform_substructure_t *clone;
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iterator_t *attributes;
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transform_attribute_t *current_attribute;
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clone = (private_transform_substructure_t *) transform_substructure_create();
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clone->next_payload = this->next_payload;
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clone->transform_type = this->transform_type;
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clone->transform_id = this->transform_id;
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attributes = this->attributes->create_iterator(this->attributes, FALSE);
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while (attributes->iterate(attributes, (void**)¤t_attribute))
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{
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current_attribute = current_attribute->clone(current_attribute);
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clone->public.add_transform_attribute(&clone->public, current_attribute);
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}
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attributes->destroy(attributes);
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return &clone->public;
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}
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/**
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* Implementation of transform_substructure_t.get_key_length.
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*/
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static status_t get_key_length(private_transform_substructure_t *this, u_int16_t *key_length)
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{
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iterator_t *attributes;
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transform_attribute_t *current_attribute;
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attributes = this->attributes->create_iterator(this->attributes, TRUE);
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while (attributes->iterate(attributes, (void**)¤t_attribute))
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{
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if (current_attribute->get_attribute_type(current_attribute) == KEY_LENGTH)
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{
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*key_length = current_attribute->get_value(current_attribute);
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attributes->destroy(attributes);
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return SUCCESS;
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}
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}
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attributes->destroy(attributes);
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return FAILED;
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}
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/**
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* Implementation of transform_substructure_t.destroy and payload_t.destroy.
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*/
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static void destroy(private_transform_substructure_t *this)
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{
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this->attributes->destroy_offset(this->attributes,
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offsetof(transform_attribute_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()
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{
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private_transform_substructure_t *this = malloc_thing(private_transform_substructure_t);
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/* payload interface */
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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.create_transform_attribute_iterator = (iterator_t * (*) (transform_substructure_t *,bool)) create_transform_attribute_iterator;
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this->public.add_transform_attribute = (void (*) (transform_substructure_t *,transform_attribute_t *)) add_transform_attribute;
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this->public.set_is_last_transform = (void (*) (transform_substructure_t *,bool)) set_is_last_transform;
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this->public.get_is_last_transform = (bool (*) (transform_substructure_t *)) get_is_last_transform;
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this->public.set_transform_type = (void (*) (transform_substructure_t *,u_int8_t)) set_transform_type;
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this->public.get_transform_type = (u_int8_t (*) (transform_substructure_t *)) get_transform_type;
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this->public.set_transform_id = (void (*) (transform_substructure_t *,u_int16_t)) set_transform_id;
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this->public.get_transform_id = (u_int16_t (*) (transform_substructure_t *)) get_transform_id;
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this->public.get_key_length = (status_t (*) (transform_substructure_t *,u_int16_t *)) get_key_length;
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this->public.clone = (transform_substructure_t* (*) (transform_substructure_t *)) clone_;
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this->public.destroy = (void (*) (transform_substructure_t *)) destroy;
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/* set default values of the fields */
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this->next_payload = NO_PAYLOAD;
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this->transform_length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
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this->transform_id = 0;
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this->transform_type = 0;
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this->attributes = linked_list_create();
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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(transform_type_t transform_type, u_int16_t transform_id, u_int16_t key_length)
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{
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transform_substructure_t *transform = transform_substructure_create();
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transform->set_transform_type(transform,transform_type);
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transform->set_transform_id(transform,transform_id);
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/* a keylength attribute is only created for variable length algos */
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if (transform_type == ENCRYPTION_ALGORITHM &&
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(transform_id == ENCR_AES_CBC ||
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transform_id == ENCR_IDEA ||
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transform_id == ENCR_CAST ||
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transform_id == ENCR_BLOWFISH))
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{
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transform_attribute_t *attribute = transform_attribute_create_key_length(key_length);
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transform->add_transform_attribute(transform,attribute);
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}
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return transform;
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}
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