326 lines
8.5 KiB
C
326 lines
8.5 KiB
C
/*
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* Copyright (C) 2012-2019 Tobias Brunner
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* Copyright (C) 2005-2007 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* HSR 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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/**
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* @defgroup ike_cfg ike_cfg
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* @{ @ingroup config
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*/
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#ifndef IKE_CFG_H_
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#define IKE_CFG_H_
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typedef enum ike_version_t ike_version_t;
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typedef enum fragmentation_t fragmentation_t;
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typedef enum childless_t childless_t;
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typedef struct ike_cfg_t ike_cfg_t;
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typedef struct ike_cfg_create_t ike_cfg_create_t;
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#include <library.h>
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#include <networking/host.h>
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#include <collections/linked_list.h>
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#include <utils/identification.h>
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#include <crypto/proposal/proposal.h>
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#include <crypto/diffie_hellman.h>
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/**
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* IKE version.
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*/
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enum ike_version_t {
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/** any version */
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IKE_ANY = 0,
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/** IKE version 1 */
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IKEV1 = 1,
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/** IKE version 2 */
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IKEV2 = 2,
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};
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/**
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* Proprietary IKEv1 fragmentation and IKEv2 fragmentation
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*/
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enum fragmentation_t {
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/** disable fragmentation */
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FRAGMENTATION_NO,
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/** announce support, but don't send any fragments */
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FRAGMENTATION_ACCEPT,
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/** enable fragmentation, if supported by peer */
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FRAGMENTATION_YES,
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/** force use of fragmentation (even for the first message for IKEv1) */
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FRAGMENTATION_FORCE,
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};
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/**
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* Childless IKE_SAs (RFC 6023)
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*/
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enum childless_t {
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/** Allow childless IKE_SAs as responder, but initiate regular IKE_SAs */
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CHILDLESS_ALLOW,
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/** Don't accept childless IKE_SAs as responder, don't initiate them */
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CHILDLESS_NEVER,
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/** Only accept the creation of childless IKE_SAs (also as responder) */
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CHILDLESS_FORCE,
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};
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/**
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* enum strings for ike_version_t
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*/
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extern enum_name_t *ike_version_names;
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/**
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* An ike_cfg_t defines the rules to set up an IKE_SA.
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*
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* @see peer_cfg_t to get an overview over the configurations.
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*/
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struct ike_cfg_t {
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/**
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* Get the IKE version to use with this configuration.
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*
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* @return IKE major version
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*/
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ike_version_t (*get_version)(ike_cfg_t *this);
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/**
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* Resolve the local address to use for initiation.
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*
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* @param family address family to prefer, or AF_UNSPEC
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* @return resolved host, NULL on error
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*/
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host_t* (*resolve_me)(ike_cfg_t *this, int family);
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/**
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* Resolve the remote address to use for initiation.
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*
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* @param family address family to prefer, or AF_UNSPEC
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* @return resolved host, NULL on error
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*/
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host_t* (*resolve_other)(ike_cfg_t *this, int family);
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/**
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* Check how good a host matches to the configured local address.
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*
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* @param host host to check match quality
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* @return quality of the match, 0 if not matching at all
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*/
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u_int (*match_me)(ike_cfg_t *this, host_t *host);
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/**
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* Check how good a host matches to the configured remote address.
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*
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* @param host host to check match quality
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* @return quality of the match, 0 if not matching at all
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*/
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u_int (*match_other)(ike_cfg_t *this, host_t *host);
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/**
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* Get own address.
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*
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* @return string of address/DNS name
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*/
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char* (*get_my_addr) (ike_cfg_t *this);
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/**
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* Get peer's address.
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*
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* @return string of address/DNS name
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*/
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char* (*get_other_addr) (ike_cfg_t *this);
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/**
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* Get the port to use as our source port.
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*
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* @return source address port, host order
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*/
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uint16_t (*get_my_port)(ike_cfg_t *this);
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/**
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* Get the port to use as destination port.
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*
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* @return destination address, host order
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*/
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uint16_t (*get_other_port)(ike_cfg_t *this);
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/**
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* Get the DSCP value to use for IKE packets send from connections.
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*
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* @return DSCP value
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*/
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uint8_t (*get_dscp)(ike_cfg_t *this);
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/**
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* Adds a proposal to the list.
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*
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* The first added proposal has the highest priority, the last
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* added the lowest. It is safe to add NULL as proposal, which has no
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* effect.
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*
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* @param proposal proposal to add, or NULL
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*/
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void (*add_proposal) (ike_cfg_t *this, proposal_t *proposal);
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/**
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* Returns a list of all supported proposals.
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*
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* Returned list and its proposals must be destroyed after use.
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*
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* @return list containing all the proposals
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*/
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linked_list_t* (*get_proposals) (ike_cfg_t *this);
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/**
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* Select a proposal from a list of supplied proposals.
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*
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* Returned proposal must be destroyed after use.
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*
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* @param proposals list of proposals to select from
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* @param private accept algorithms from a private range
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* @param prefer_self whether to prefer configured or supplied proposals
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* @return selected proposal, or NULL if none matches.
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*/
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proposal_t *(*select_proposal) (ike_cfg_t *this, linked_list_t *proposals,
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bool private, bool prefer_self);
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/**
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* Check if the config has a matching proposal.
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*
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* @param match proposal to check
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* @param private accept algorithms from a private range
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* @return TRUE if a matching proposal is contained
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*/
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bool(*has_proposal)(ike_cfg_t *this, proposal_t *match, bool private);
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/**
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* Should we send a certificate request in IKE_SA_INIT?
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*
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* @return certificate request sending policy
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*/
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bool (*send_certreq) (ike_cfg_t *this);
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/**
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* Enforce UDP encapsulation by faking NATD notifies?
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*
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* @return TRUE to enforce UDP encapsulation
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*/
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bool (*force_encap) (ike_cfg_t *this);
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/**
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* Use IKE fragmentation
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*
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* @return TRUE to use fragmentation
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*/
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fragmentation_t (*fragmentation) (ike_cfg_t *this);
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/**
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* Whether to initiate/accept childless IKE_SAs
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*
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* @return initiate/accept childless IKE_SAs
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*/
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childless_t (*childless)(ike_cfg_t *this);
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/**
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* Get the DH group to use for IKE_SA setup.
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*
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* @return dh group to use for initialization
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*/
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diffie_hellman_group_t (*get_dh_group)(ike_cfg_t *this);
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/**
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* Check if two IKE configs are equal.
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*
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* @param other other to check for equality
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* @return TRUE if other equal to this
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*/
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bool (*equals)(ike_cfg_t *this, ike_cfg_t *other);
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/**
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* Increase reference count.
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*
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* @return reference to this
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*/
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ike_cfg_t* (*get_ref) (ike_cfg_t *this);
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/**
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* Destroys a ike_cfg_t object.
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*
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* Decrements the internal reference counter and
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* destroys the ike_cfg when it reaches zero.
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*/
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void (*destroy) (ike_cfg_t *this);
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};
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/**
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* Data passed to the constructor of an ike_cfg_t object.
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*
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* local and remote are comma separated lists of IP addresses, DNS names,
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* IP ranges or subnets. When initiating, the first non-range/subnet address is
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* used as address. When responding, a match is performed against all items in
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* the list.
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*/
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struct ike_cfg_create_t {
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/** IKE major version to use for this config */
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ike_version_t version;
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/** Address/DNS name of local peer (cloned) */
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char *local;
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/** IKE port to use as source, 500 uses IKEv2 port floating */
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uint16_t local_port;
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/** Address/DNS name of remote peer (cloned) */
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char *remote;
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/** IKE port to use as dest, 500 uses IKEv2 port floating */
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uint16_t remote_port;
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/** TRUE to not send any certificate requests */
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bool no_certreq;
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/** Enforce UDP encapsulation by faking NATD notify */
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bool force_encap;
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/** Use IKE fragmentation */
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fragmentation_t fragmentation;
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/** Childless IKE_SA configuration */
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childless_t childless;
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/** DSCP value to send IKE packets with */
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uint8_t dscp;
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};
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/**
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* Creates an ike_cfg_t object.
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*
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* @param data data for this ike_cfg
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* @return ike_cfg_t object.
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*/
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ike_cfg_t *ike_cfg_create(ike_cfg_create_t *data);
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/**
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* Determine the address family of the local or remote address(es). If multiple
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* families are configured AF_UNSPEC is returned. %any is ignored (%any4|6 are
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* not though).
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*
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* @param this ike config to check
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* @param local TRUE to check local addresses, FALSE for remote
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* @return address family of address(es) if distinct
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*/
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int ike_cfg_get_family(ike_cfg_t *this, bool local);
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/**
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* Determine if the given address was explicitly configured as local or remote
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* address.
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*
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* @param this ike config to check
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* @param addr address to check
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* @param local TRUE to check local addresses, FALSE for remote
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* @return TRUE if address was configured
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*/
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bool ike_cfg_has_address(ike_cfg_t *this, host_t *addr, bool local);
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#endif /** IKE_CFG_H_ @}*/
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