- created encoding package
This commit is contained in:
Martin Willi
@@ -0,0 +1,577 @@
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/**
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* @file transform_substructure.h
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*
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* @brief Declaration of the class transform_substructure_t.
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*
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* An object of this type represents an IKEv2 TRANSFORM Substructure and contains Attributes.
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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 "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/allocator.h>
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#include <utils/linked_list.h>
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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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typedef struct private_transform_substructure_s private_transform_substructure_t;
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struct private_transform_substructure_s {
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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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* @brief Computes the length of this substructure.
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*
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* @param this calling private_transform_substructure_t object
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* @return
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* SUCCESS in any case
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*/
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status_t (*compute_length) (private_transform_substructure_t *this);
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};
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/**
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* string mappings for transform_type_t
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*/
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mapping_t transform_type_m[] = {
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{UNDEFINED_TRANSFORM_TYPE, "UNDEFINED_TRANSFORM_TYPE"},
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{ENCRYPTION_ALGORITHM, "ENCRYPTION_ALGORITHM"},
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{PSEUDO_RANDOM_FUNCTION, "PSEUDO_RANDOM_FUNCTION"},
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{INTEGRITIY_ALGORITHM, "INTEGRITIY_ALGORITHM"},
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{DIFFIE_HELLMAN_GROUP, "DIFFIE_HELLMAN_GROUP"},
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{EXTENDED_SEQUENCE_NUNBERS, "EXTENDED_SEQUENCE_NUNBERS"},
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{MAPPING_END, NULL}
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};
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/**
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* string mappings for encryption_algorithm_t
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*/
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mapping_t encryption_algorithm_m[] = {
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{ENCR_UNDEFINED, "ENCR_UNDEFINED"},
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{ENCR_DES_IV64, "ENCR_DES_IV64"},
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{ENCR_DES, "ENCR_DES"},
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{ENCR_3DES, "ENCR_3DES"},
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{ENCR_RC5, "ENCR_RC5"},
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{ENCR_IDEA, "ENCR_IDEA"},
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{ENCR_CAST, "ENCR_CAST"},
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{ENCR_BLOWFISH, "ENCR_BLOWFISH"},
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{ENCR_3IDEA, "ENCR_3IDEA"},
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{ENCR_DES_IV32, "ENCR_DES_IV32"},
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{ENCR_NULL, "ENCR_NULL"},
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{ENCR_AES_CBC, "ENCR_AES_CBC"},
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{ENCR_AES_CTR, "ENCR_AES_CTR"},
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{MAPPING_END, NULL}
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};
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/**
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* string mappings for encryption_algorithm_t
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*/
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mapping_t pseudo_random_function_m[] = {
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{PRF_UNDEFINED, "PRF_UNDEFINED"},
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{PRF_HMAC_MD5, "PRF_HMAC_MD5"},
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{PRF_HMAC_SHA1, "PRF_HMAC_SHA1"},
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{PRF_HMAC_TIGER, "PRF_HMAC_TIGER"},
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{PRF_AES128_CBC, "PRF_AES128_CBC"},
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{MAPPING_END, NULL}
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};
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/**
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* string mappings for integrity_algorithm_t
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*/
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mapping_t integrity_algorithm_m[] = {
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{AUTH_UNDEFINED, "AUTH_UNDEFINED"},
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{AUTH_HMAC_MD5_96, "AUTH_HMAC_MD5_96"},
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{AUTH_HMAC_SHA1_96, "AUTH_HMAC_SHA1_96"},
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{AUTH_DES_MAC, "AUTH_DES_MAC"},
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{AUTH_KPDK_MD5, "AUTH_KPDK_MD5"},
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{AUTH_AES_XCBC_96, "AUTH_AES_XCBC_96"},
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{MAPPING_END, NULL}
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};
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/**
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* string mappings for diffie_hellman_group_t
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*/
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mapping_t diffie_hellman_group_m[] = {
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{MODP_UNDEFINED, "MODP_UNDEFINED"},
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{MODP_768_BIT, "MODP_768_BIT"},
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{MODP_1024_BIT, "MODP_1024_BIT"},
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{MODP_1536_BIT, "MODP_1536_BIT"},
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{MODP_2048_BIT, "MODP_2048_BIT"},
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{MODP_3072_BIT, "MODP_3072_BIT"},
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{MODP_4096_BIT, "MODP_4096_BIT"},
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{MODP_6144_BIT, "MODP_6144_BIT"},
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{MODP_8192_BIT, "MODP_8192_BIT"},
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{MAPPING_END, NULL}
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};
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/**
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* string mappings for extended_sequence_numbers_t
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*/
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mapping_t extended_sequence_numbers_m[] = {
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{NO_EXT_SEQ_NUMBERS, "NO_EXT_SEQ_NUMBERS"},
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{EXT_SEQ_NUMBERS, "EXT_SEQ_NUMBERS"},
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{MAPPING_END, NULL}
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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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* 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_transform_substructure_t *this)
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{
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if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != TRANSFORM_SUBSTRUCTURE))
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{
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/* must be 0 or 3 */
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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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{
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if ((this->transform_id < ENCR_DES_IV64) || (this->transform_id > ENCR_AES_CTR))
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{
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return FAILED;
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}
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break;
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}
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case PSEUDO_RANDOM_FUNCTION:
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{
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if ((this->transform_id < PRF_HMAC_MD5) || (this->transform_id > PRF_AES128_CBC))
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{
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return FAILED;
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}
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break;
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}
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case INTEGRITIY_ALGORITHM:
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{
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if ((this->transform_id < AUTH_HMAC_MD5_96) || (this->transform_id > AUTH_AES_XCBC_96))
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{
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return FAILED;
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}
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break;
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}
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case DIFFIE_HELLMAN_GROUP:
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{
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switch (this->transform_id)
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{
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case MODP_768_BIT:
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case MODP_1024_BIT:
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case MODP_1536_BIT:
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case MODP_2048_BIT:
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case MODP_3072_BIT:
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case MODP_4096_BIT:
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case MODP_6144_BIT:
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case MODP_8192_BIT:
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{
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break;
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}
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default:
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{
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return FAILED;
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}
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}
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break;
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}
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case EXTENDED_SEQUENCE_NUNBERS:
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{
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if ((this->transform_id != NO_EXT_SEQ_NUMBERS) && (this->transform_id != EXT_SEQ_NUMBERS))
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{
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return FAILED;
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}
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break;
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}
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default:
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{
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/* not a supported transform type! */
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return FAILED;
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}
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}
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/* proposal number is checked in SA payload */
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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(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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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(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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* 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(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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* 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(private_transform_substructure_t *this)
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{
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this->compute_length(this);
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return this->transform_length;
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}
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/**
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* Implements transform_substructure_t's create_transform_attribute_iterator function.
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* See #transform_substructure_s.create_transform_attribute_iterator for description.
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*/
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static status_t create_transform_attribute_iterator (private_transform_substructure_t *this,linked_list_iterator_t **iterator,bool forward)
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{
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return (this->attributes->create_iterator(this->attributes,iterator,forward));
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}
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/**
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* Implements transform_substructure_t's add_transform_attribute function.
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* See #transform_substructure_s.add_transform_attribute for description.
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*/
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static status_t add_transform_attribute (private_transform_substructure_t *this,transform_attribute_t *attribute)
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{
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status_t status;
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status = this->attributes->insert_last(this->attributes,(void *) attribute);
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this->compute_length(this);
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return status;
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}
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/**
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* Implements transform_substructure_t's set_is_last_transform function.
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* See #transform_substructure_s.set_is_last_transform for description.
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*/
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static status_t 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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return SUCCESS;
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}
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/**
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* Implements transform_substructure_t's get_is_last_transform function.
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* See #transform_substructure_s.get_is_last_transform for description.
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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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* 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(private_transform_substructure_t *this,payload_type_t type)
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{
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return SUCCESS;
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}
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/**
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* Implements transform_substructure_t's set_transform_type function.
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* See #transform_substructure_s.set_transform_type for description.
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*/
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static status_t 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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return SUCCESS;
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}
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/**
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* Implements transform_substructure_t's get_transform_type function.
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* See #transform_substructure_s.get_transform_type for description.
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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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* Implements transform_substructure_t's set_transform_id function.
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* See #transform_substructure_s.set_transform_id for description.
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*/
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static status_t 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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return SUCCESS;
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||||
}
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||||
|
||||
/**
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* Implements transform_substructure_t's get_transform_id function.
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||||
* See #transform_substructure_s.get_transform_id for description.
|
||||
*/
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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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||||
|
||||
/**
|
||||
* Implements private_transform_substructure_t's compute_length function.
|
||||
* See #private_transform_substructure_s.compute_length for description.
|
||||
*/
|
||||
static status_t compute_length (private_transform_substructure_t *this)
|
||||
{
|
||||
linked_list_iterator_t *iterator;
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||||
status_t status;
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||||
size_t length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
|
||||
status = this->attributes->create_iterator(this->attributes,&iterator,TRUE);
|
||||
if (status != SUCCESS)
|
||||
{
|
||||
return length;
|
||||
}
|
||||
while (iterator->has_next(iterator))
|
||||
{
|
||||
payload_t * current_attribute;
|
||||
iterator->current(iterator,(void **) ¤t_attribute);
|
||||
length += current_attribute->get_length(current_attribute);
|
||||
}
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||||
iterator->destroy(iterator);
|
||||
|
||||
this->transform_length = length;
|
||||
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implements transform_substructure_t's clone function.
|
||||
* See transform_substructure_s.clone for description.
|
||||
*/
|
||||
static status_t clone(private_transform_substructure_t *this,transform_substructure_t **clone)
|
||||
{
|
||||
private_transform_substructure_t *new_clone;
|
||||
linked_list_iterator_t *attributes;
|
||||
status_t status;
|
||||
|
||||
new_clone = (private_transform_substructure_t *) transform_substructure_create();
|
||||
|
||||
new_clone->next_payload = this->next_payload;
|
||||
new_clone->transform_type = this->transform_type;
|
||||
new_clone->transform_id = this->transform_id;
|
||||
|
||||
status = this->attributes->create_iterator(this->attributes,&attributes,FALSE);
|
||||
if (status != SUCCESS)
|
||||
{
|
||||
new_clone->public.destroy(&(new_clone->public));
|
||||
return status;
|
||||
}
|
||||
|
||||
while (attributes->has_next(attributes))
|
||||
{
|
||||
transform_attribute_t *current_attribute;
|
||||
transform_attribute_t *current_attribute_clone;
|
||||
status = attributes->current(attributes,(void **) ¤t_attribute);
|
||||
if (status != SUCCESS)
|
||||
{
|
||||
attributes->destroy(attributes);
|
||||
new_clone->public.destroy(&(new_clone->public));
|
||||
return status;
|
||||
}
|
||||
status = current_attribute->clone(current_attribute,¤t_attribute_clone);
|
||||
if (status != SUCCESS)
|
||||
{
|
||||
attributes->destroy(attributes);
|
||||
new_clone->public.destroy(&(new_clone->public));
|
||||
return status;
|
||||
}
|
||||
|
||||
status = new_clone->public.add_transform_attribute(&(new_clone->public),current_attribute_clone);
|
||||
if (status != SUCCESS)
|
||||
{
|
||||
attributes->destroy(attributes);
|
||||
current_attribute_clone->destroy(current_attribute_clone);
|
||||
new_clone->public.destroy(&(new_clone->public));
|
||||
return status;
|
||||
}
|
||||
}
|
||||
|
||||
attributes->destroy(attributes);
|
||||
|
||||
*clone = &(new_clone->public);
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Implements payload_t's and transform_substructure_t's destroy function.
|
||||
* See #payload_s.destroy or transform_substructure_s.destroy for description.
|
||||
*/
|
||||
static status_t destroy(private_transform_substructure_t *this)
|
||||
{
|
||||
/* all proposals are getting destroyed */
|
||||
while (this->attributes->get_count(this->attributes) > 0)
|
||||
{
|
||||
transform_attribute_t *current_attribute;
|
||||
if (this->attributes->remove_last(this->attributes,(void **)¤t_attribute) != SUCCESS)
|
||||
{
|
||||
break;
|
||||
}
|
||||
current_attribute->destroy(current_attribute);
|
||||
}
|
||||
this->attributes->destroy(this->attributes);
|
||||
|
||||
allocator_free(this);
|
||||
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
/*
|
||||
* Described in header
|
||||
*/
|
||||
transform_substructure_t *transform_substructure_create()
|
||||
{
|
||||
private_transform_substructure_t *this = allocator_alloc_thing(private_transform_substructure_t);
|
||||
if (this == NULL)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* payload interface */
|
||||
this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
|
||||
this->public.payload_interface.get_encoding_rules = (status_t (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
|
||||
this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
|
||||
this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
|
||||
this->public.payload_interface.set_next_type = (status_t (*) (payload_t *,payload_type_t)) set_next_type;
|
||||
this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
|
||||
this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
|
||||
|
||||
/* public functions */
|
||||
this->public.create_transform_attribute_iterator = (status_t (*) (transform_substructure_t *,linked_list_iterator_t **,bool)) create_transform_attribute_iterator;
|
||||
this->public.add_transform_attribute = (status_t (*) (transform_substructure_t *,transform_attribute_t *)) add_transform_attribute;
|
||||
this->public.set_is_last_transform = (status_t (*) (transform_substructure_t *,bool)) set_is_last_transform;
|
||||
this->public.get_is_last_transform = (bool (*) (transform_substructure_t *)) get_is_last_transform;
|
||||
this->public.set_transform_type = (status_t (*) (transform_substructure_t *,u_int8_t)) set_transform_type;
|
||||
this->public.get_transform_type = (u_int8_t (*) (transform_substructure_t *)) get_transform_type;
|
||||
this->public.set_transform_id = (status_t (*) (transform_substructure_t *,u_int16_t)) set_transform_id;
|
||||
this->public.get_transform_id = (u_int16_t (*) (transform_substructure_t *)) get_transform_id;
|
||||
this->public.clone = (status_t (*) (transform_substructure_t *,transform_substructure_t **)) clone;
|
||||
this->public.destroy = (status_t (*) (transform_substructure_t *)) destroy;
|
||||
|
||||
/* private functions */
|
||||
this->compute_length = compute_length;
|
||||
|
||||
/* set default values of the fields */
|
||||
this->next_payload = NO_PAYLOAD;
|
||||
this->transform_length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
|
||||
this->transform_id = 0;
|
||||
this->transform_type = 0;
|
||||
|
||||
this->attributes = linked_list_create();
|
||||
|
||||
if (this->attributes == NULL)
|
||||
{
|
||||
allocator_free(this);
|
||||
return NULL;
|
||||
}
|
||||
return (&(this->public));
|
||||
}
|
||||
Reference in New Issue
Block a user