277 lines
6.8 KiB
C
277 lines
6.8 KiB
C
/**
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* @file proposal.h
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*
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* @brief Interface of proposal_t.
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*
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*/
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/*
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* Copyright (C) 2006 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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#ifndef PROPOSAL_H_
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#define PROPOSAL_H_
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typedef enum protocol_id_t protocol_id_t;
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typedef enum transform_type_t transform_type_t;
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typedef enum extended_sequence_numbers_t extended_sequence_numbers_t;
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typedef struct algorithm_t algorithm_t;
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typedef struct proposal_t proposal_t;
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#include <library.h>
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#include <utils/identification.h>
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#include <utils/linked_list.h>
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#include <utils/host.h>
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#include <crypto/crypters/crypter.h>
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#include <crypto/signers/signer.h>
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#include <crypto/diffie_hellman.h>
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#include <config/traffic_selector.h>
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/**
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* Protocol ID of a proposal.
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*
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* @ingroup config
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*/
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enum protocol_id_t {
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PROTO_NONE = 0,
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PROTO_IKE = 1,
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PROTO_AH = 2,
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PROTO_ESP = 3,
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};
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/**
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* enum names for protocol_id_t
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*
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* @ingroup config
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*/
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extern enum_name_t *protocol_id_names;
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/**
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* Type of a transform, as in IKEv2 RFC 3.3.2.
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*
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* @ingroup config
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*/
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enum transform_type_t {
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UNDEFINED_TRANSFORM_TYPE = 241,
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ENCRYPTION_ALGORITHM = 1,
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PSEUDO_RANDOM_FUNCTION = 2,
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INTEGRITY_ALGORITHM = 3,
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DIFFIE_HELLMAN_GROUP = 4,
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EXTENDED_SEQUENCE_NUMBERS = 5
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};
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/**
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* enum names for transform_type_t.
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*
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* @ingroup config
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*/
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extern enum_name_t *transform_type_names;
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/**
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* Extended sequence numbers, as in IKEv2 RFC 3.3.2.
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*
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* @ingroup config
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*/
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enum extended_sequence_numbers_t {
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NO_EXT_SEQ_NUMBERS = 0,
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EXT_SEQ_NUMBERS = 1
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};
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/**
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* enum strings for extended_sequence_numbers_t.
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*
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* @ingroup config
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*/
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extern enum_name_t *extended_sequence_numbers_names;
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/**
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* Struct used to store different kinds of algorithms. The internal
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* lists of algorithms contain such structures.
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*
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* @ingroup config
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*/
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struct algorithm_t {
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/**
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* Value from an encryption_algorithm_t/integrity_algorithm_t/...
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*/
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u_int16_t algorithm;
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/**
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* the associated key size in bits, or zero if not needed
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*/
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u_int16_t key_size;
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};
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/**
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* @brief Stores a set of algorithms used for an SA.
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*
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* A proposal stores algorithms for a specific
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* protocol. It can store algorithms for one protocol.
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* Proposals with multiple protocols are not supported,
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* as it's not specified in RFC4301 anymore.
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*
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* @b Constructors:
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* - proposal_create()
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*
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* @ingroup config
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*/
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struct proposal_t {
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/**
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* @brief Add an algorithm to the proposal.
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*
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* The algorithms are stored by priority, first added
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* is the most preferred.
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* Key size is only needed for encryption algorithms
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* with variable key size (such as AES). Must be set
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* to zero if key size is not specified.
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* The alg parameter accepts encryption_algorithm_t,
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* integrity_algorithm_t, dh_group_number_t and
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* extended_sequence_numbers_t.
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*
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* @param this calling object
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* @param type kind of algorithm
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* @param alg identifier for algorithm
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* @param key_size key size to use
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*/
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void (*add_algorithm) (proposal_t *this, transform_type_t type, u_int16_t alg, size_t key_size);
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/**
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* @brief Get an iterator over algorithms for a specifc algo type.
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*
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* @param this calling object
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* @param type kind of algorithm
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* @return iterator over algorithm_t's
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*/
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iterator_t *(*create_algorithm_iterator) (proposal_t *this, transform_type_t type);
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/**
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* @brief Get the algorithm for a type to use.
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*
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* If there are multiple algorithms, only the first is returned.
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*
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* @param this calling object
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* @param type kind of algorithm
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* @param[out] algo pointer which receives algorithm and key size
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* @return TRUE if algorithm of this kind available
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*/
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bool (*get_algorithm) (proposal_t *this, transform_type_t type, algorithm_t** algo);
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/**
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* @brief Check if the proposal has a specific DH group.
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*
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* @param this calling object
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* @param group group to check for
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* @return TRUE if algorithm included
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*/
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bool (*has_dh_group) (proposal_t *this, diffie_hellman_group_t group);
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/**
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* @brief Compare two proposal, and select a matching subset.
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*
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* If the proposals are for the same protocols (AH/ESP), they are
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* compared. If they have at least one algorithm of each type
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* in common, a resulting proposal of this kind is created.
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*
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* @param this calling object
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* @param other proposal to compair agains
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* @return
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* - selected proposal, if possible
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* - NULL, if proposals don't match
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*/
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proposal_t *(*select) (proposal_t *this, proposal_t *other);
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/**
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* @brief Get the protocol ID of the proposal.
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*
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* @param this calling object
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* @return protocol of the proposal
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*/
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protocol_id_t (*get_protocol) (proposal_t *this);
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/**
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* @brief Get the SPI of the proposal.
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*
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* @param this calling object
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* @return spi for proto
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*/
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u_int64_t (*get_spi) (proposal_t *this);
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/**
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* @brief Set the SPI of the proposal.
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*
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* @param this calling object
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* @param spi spi to set for proto
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*/
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void (*set_spi) (proposal_t *this, u_int64_t spi);
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/**
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* @brief Clone a proposal.
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*
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* @param this proposal to clone
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* @return clone of it
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*/
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proposal_t *(*clone) (proposal_t *this);
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/**
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* @brief Destroys the proposal object.
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*
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* @param this calling object
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*/
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void (*destroy) (proposal_t *this);
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};
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/**
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* @brief Create a child proposal for AH, ESP or IKE.
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*
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* @param protocol protocol, such as PROTO_ESP
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* @return proposal_t object
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*
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* @ingroup config
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*/
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proposal_t *proposal_create(protocol_id_t protocol);
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/**
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* @brief Create a default proposal if nothing further specified.
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*
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* @param protocol protocol, such as PROTO_ESP
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* @return proposal_t object
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*
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* @ingroup config
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*/
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proposal_t *proposal_create_default(protocol_id_t protocol);
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/**
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* @brief Create a proposal from a string identifying the algorithms.
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*
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* The string is in the same form as a in the ipsec.conf file.
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* E.g.: aes128-sha2_256-modp2048
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* 3des-md5
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* An additional '!' at the end of the string forces this proposal,
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* without it the peer may choose another algorithm we support.
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*
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* @param protocol protocol, such as PROTO_ESP
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* @param algs algorithms as string
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* @return proposal_t object
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*
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* @ingroup config
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*/
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proposal_t *proposal_create_from_string(protocol_id_t protocol, const char *algs);
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#endif /* PROPOSAL_H_ */
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