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exchange.h
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/* $OpenBSD: exchange.h,v 1.37 2018/01/15 09:54:48 mpi Exp $ */
/* $EOM: exchange.h,v 1.28 2000/09/28 12:54:28 niklas Exp $ */
/*
* Copyright (c) 1998, 1999, 2001 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#ifndef _EXCHANGE_H_
#define _EXCHANGE_H_
#include <sys/types.h>
#include <sys/queue.h>
#include "exchange_num.h"
#include "isakmp.h"
/* Remove an exchange if it has not been fully negotiated in this time. */
#define EXCHANGE_MAX_TIME 120
struct crypto_xf;
struct certreq_aca;
struct doi;
struct event;
struct keystate;
struct message;
struct payload;
struct transport;
struct sa;
struct exchange {
/* Link to exchanges with the same hash value. */
LIST_ENTRY(exchange) link;
/* This exchange is linked to the global exchange list. */
int linked;
/* A name of the SAs this exchange will result in. XXX non unique? */
char *name;
/*
* A name of the major policy deciding offers and acceptable
* proposals.
*/
char *policy;
/*
* A function with a polymorphic argument called after the exchange
* has been run to its end, successfully. The 2nd argument is true
* if the finalization hook is called due to the exchange not running
* to its end normally.
*/
void (*finalize)(struct exchange *, void *, int);
void *finalize_arg;
/* When several SA's are being negotiated we keep them here. */
TAILQ_HEAD(sa_head, sa) sa_list;
/*
* The event that will occur when it has taken too long time to try to
* run the exchange and which will trigger auto-destruction.
*/
struct event *death;
/*
* Both initiator and responder cookies.
* XXX For code clarity we might split this into two fields.
*/
u_int8_t cookies[ISAKMP_HDR_COOKIES_LEN];
/* The message ID signifying phase 2 exchanges. */
u_int8_t message_id[ISAKMP_HDR_MESSAGE_ID_LEN];
/* The exchange type we are using. */
u_int8_t type;
/* Phase is 1 for ISAKMP SA exchanges, and 2 for application ones. */
u_int8_t phase;
/* The "step counter" of the exchange, starting from zero. */
u_int8_t step;
/* 1 if we are the initiator, 0 if we are the responder. */
u_int8_t initiator;
/* Various flags, look below for descriptions. */
u_int32_t flags;
/* The DOI that is to handle DOI-specific issues for this exchange. */
struct doi *doi;
/*
* A "program counter" into the script that validate message contents
* for this exchange.
*/
int16_t *exch_pc;
/* The last message received, used for checking for duplicates. */
struct message *last_received;
/* The last message sent, to be acked when something new is received. */
struct message *last_sent;
/*
* If some message is queued up for sending, we want to be able to
* remove it from the queue, when the exchange is deleted.
*/
struct message *in_transit;
/*
* Initiator's & responder's nonces respectively, with lengths.
* XXX Should this be in the DOI-specific parts instead?
*/
u_int8_t *nonce_i;
size_t nonce_i_len;
u_int8_t *nonce_r;
size_t nonce_r_len;
/*
* The ID payload contents for the initiator & responder,
* respectively.
*/
u_int8_t *id_i;
size_t id_i_len;
u_int8_t *id_r;
size_t id_r_len;
/* Policy session identifier, where applicable. */
int policy_id;
/* Crypto info needed to encrypt/decrypt packets in this exchange. */
struct crypto_xf *crypto;
size_t key_length;
struct keystate *keystate;
/*
* Used only by KeyNote, to cache the key used to authenticate Phase
* 1
*/
char *keynote_key; /* printable format */
/*
* Received certificate - used to verify signatures on packet,
* stored here for later policy processing.
*
* The rules for the recv_* and sent_* fields are:
* - recv_cert stores the credential (if any) received from the peer;
* the kernel may pass us one, but we ignore it. We pass it to the
* kernel so processes can peek at it. When doing passphrase
* authentication in Phase 1, this is empty.
* - recv_key stores the key (public or private) used by the peer
* to authenticate. Otherwise, same properties as recv_cert except
* that we don't tell the kernel about passphrases (so we don't
* reveal system-wide passphrases). Processes that used passphrase
* authentication already know the passphrase! We ignore it if/when
* received from the kernel (meaningless).
* - sent_cert stores the credential, if any, we used to authenticate
* with the peer. It may be passed to us by the kernel, or we may
* have found it in our certificate storage. In either case, there's
* no point passing it to the kernel, so we don't.
* - sent key stores the private key we used for authentication with
* the peer (private key or passphrase). This may have been received
* from the kernel, or may be a system-wide setting. In either case,
* we don't pass it to the kernel, to avoid revealing such information
* to processes (processes either already know it, or have no business
* knowing it).
*/
int recv_certtype, recv_keytype;
void *recv_cert; /* Certificate received from peer,
* native format */
void *recv_key; /* Key peer used to authenticate,
* native format */
/* Likewise, for certificates we use. */
int sent_certtype, sent_keytype;
void *sent_cert; /* Certificate (to be) sent to peer,
* native format */
/* ACQUIRE sequence number. */
u_int32_t seq;
/* XXX This is no longer necessary, it is covered by policy. */
/* Acceptable authorities for cert requests. */
TAILQ_HEAD(aca_head, certreq_aca) aca_list;
/* DOI-specific opaque data. */
void *data;
};
/* The flag bits. */
#define EXCHANGE_FLAG_I_COMMITTED 0x0001
#define EXCHANGE_FLAG_HE_COMMITTED 0x0002
#define EXCHANGE_FLAG_COMMITTED (EXCHANGE_FLAG_I_COMMITTED \
| EXCHANGE_FLAG_HE_COMMITTED)
#define EXCHANGE_FLAG_ENCRYPT 0x0004
#define EXCHANGE_FLAG_NAT_T_CAP_PEER 0x0008 /* Peer is NAT capable. */
#define EXCHANGE_FLAG_NAT_T_ENABLE 0x0010 /* We are doing NAT-T. */
#define EXCHANGE_FLAG_NAT_T_KEEPALIVE 0x0020 /* We are the NAT:ed peer. */
#define EXCHANGE_FLAG_DPD_CAP_PEER 0x0040 /* Peer is DPD capable. */
#define EXCHANGE_FLAG_NAT_T_RFC 0x0080 /* Peer does RFC NAT-T. */
#define EXCHANGE_FLAG_NAT_T_DRAFT 0x0100 /* Peer does draft NAT-T.*/
#define EXCHANGE_FLAG_OPENBSD 0x0200 /* Peer is OpenBSD */
extern int exchange_add_certs(struct message *);
extern int exchange_add_certreqs(struct message *);
extern void exchange_finalize(struct message *);
extern void exchange_free(struct exchange *);
extern void exchange_free_aca_list(struct exchange *);
extern void exchange_establish(char *name, void (*)(struct exchange *,
void *, int), void *, int);
extern int exchange_establish_p1(struct transport *, u_int8_t, u_int32_t,
char *, void *, void (*)(struct exchange *, void *, int),
void *, int);
extern int exchange_establish_p2(struct sa *, u_int8_t, char *, void *,
void (*)(struct exchange *, void *, int), void *);
extern int exchange_gen_nonce(struct message *, size_t);
extern void exchange_init(void);
extern struct exchange *exchange_lookup(u_int8_t *, int);
extern struct exchange *exchange_lookup_by_name(char *, int);
extern struct exchange *exchange_lookup_from_icookie(u_int8_t *);
extern void exchange_report(void);
extern void exchange_run(struct message *);
extern int exchange_save_nonce(struct message *);
extern int exchange_save_certreq(struct message *);
extern int16_t *exchange_script(struct exchange *);
extern struct exchange *exchange_setup_p1(struct message *, u_int32_t);
extern struct exchange *exchange_setup_p2(struct message *, u_int8_t);
extern void exchange_upgrade_p1(struct message *);
#endif /* _EXCHANGE_H_ */