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proposal.h
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proposal.h
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/* $KAME: proposal.h,v 1.15 2001/04/06 14:23:48 sakane Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
*/
#include <sys/queue.h>
/*
* A. chained list of transform, only for single proto_id
* (this is same as set of transforms in single proposal payload)
* B. proposal. this will point to multiple (A) items (order is important
* here so pointer to (A) must be ordered array, or chained list).
* this covers multiple proposal on a packet if proposal # is the same.
* C. finally, (B) needs to be connected as chained list.
*
* head ---> prop[.......] ---> prop[...] ---> prop[...] ---> ...
* | | | |
* | | | +- proto4 <== must preserve order here
* | | +--- proto3
* | +----- proto2
* +------- proto1[trans1, trans2, trans3, ...]
*
* incoming packets needs to be parsed to construct the same structure
* (check "prop_pair" too).
*/
/* SA proposal specification */
struct saprop {
int prop_no;
time_t lifetime;
int lifebyte;
int pfs_group; /* pfs group */
int claim; /* flag to send RESPONDER-LIFETIME. */
/* XXX assumed DOI values are 1 or 2. */
struct saproto *head;
struct saprop *next;
};
/* SA protocol specification */
struct saproto {
int proto_id;
size_t spisize; /* spi size */
int encmode; /* encryption mode */
/* XXX should be vchar_t * */
/* these are network byte order */
u_int32_t spi; /* inbound. i.e. --SA-> me */
u_int32_t spi_p; /* outbound. i.e. me -SA-> */
vchar_t *keymat; /* KEYMAT */
vchar_t *keymat_p; /* peer's KEYMAT */
int reqid_out; /* request id (outbound) */
int reqid_in; /* request id (inbound) */
int len; /* length, in bits */
int ok; /* if 1, success to set SA in kenrel */
struct satrns *head; /* header of transform */
struct saproto *next; /* next protocol */
};
/* SA algorithm specification */
struct satrns {
int trns_no;
int trns_id; /* transform id */
int encklen; /* key length of encryption algorithm */
int authtype; /* authentication algorithm if ESP */
struct satrns *next; /* next transform */
};
/*
* prop_pair: (proposal number, transform number)
*
* (SA (P1 (T1 T2)) (P1' (T1' T2')) (P2 (T1" T2")))
*
* p[1] p[2]
* top (P1,T1) (P2",T1")
* | |tnext |tnext
* | v v
* | (P1, T2) (P2", T2")
* v next
* (P1', T1')
* |tnext
* v
* (P1', T2')
*
* when we convert it to saprop in prop2saprop(), it should become like:
*
* (next)
* saprop --------------------> saprop
* | (head) | (head)
* +-> saproto +-> saproto
* | | (head) | (head)
* | +-> satrns(P1 T1) +-> satrns(P2" T1")
* | | (next) | (next)
* | v v
* | satrns(P1, T2) satrns(P2", T2")
* v (next)
* saproto
* | (head)
* +-> satrns(P1' T1')
* | (next)
* v
* satrns(P1', T2')
*/
struct prop_pair {
struct isakmp_pl_p *prop;
struct isakmp_pl_t *trns;
struct prop_pair *next; /* next prop_pair with same proposal # */
/* (bundle case) */
struct prop_pair *tnext; /* next prop_pair in same proposal payload */
/* (multiple tranform case) */
};
#define MAXPROPPAIRLEN 256 /* It's enough because field size is 1 octet. */
/*
* Lifetime length selection refered to the section 4.5.4 of RFC2407. It does
* not completely conform to the description of RFC. There are four types of
* the behavior. If the value of "proposal_check" in "remote" directive is;
* "obey"
* the responder obey the initiator anytime.
* "strict"
* If the responder's length is longer than the initiator's one, the
* responder uses the intitiator's one. Otherwise rejects the proposal.
* If PFS is not required by the responder, the responder obeys the
* proposal. If PFS is required by both sides and if the responder's
* group is not equal to the initiator's one, then the responder reject
* the proposal.
* "claim"
* If the responder's length is longer than the initiator's one, the
* responder use the intitiator's one. If the responder's length is
* shorter than the initiator's one, the responder uses own length
* AND send RESPONDER-LIFETIME notify message to a initiator in the
* case of lifetime.
* About PFS, this directive is same as "strict".
* "exact"
* If the initiator's length is not equal to the responder's one, the
* responder rejects the proposal.
* If PFS is required and if the responder's group is not equal to
* the initiator's one, then the responder reject the proposal.
* XXX should be defined the behavior of key length.
*/
#define PROP_CHECK_OBEY 1
#define PROP_CHECK_STRICT 2
#define PROP_CHECK_CLAIM 3
#define PROP_CHECK_EXACT 4
struct sainfo;
struct ph1handle;
struct secpolicy;
extern struct saprop *newsaprop __P((void));
extern struct saproto *newsaproto __P((void));
extern void inssaprop __P((struct saprop **, struct saprop *));
extern void inssaproto __P((struct saprop *, struct saproto *));
extern void inssaprotorev __P((struct saprop *, struct saproto *));
extern struct satrns *newsatrns __P((void));
extern void inssatrns __P((struct saproto *, struct satrns *));
extern struct saprop *cmpsaprop_alloc __P((struct ph1handle *,
const struct saprop *, const struct saprop *, int));
extern int cmpsaprop __P((const struct saprop *, const struct saprop *));
extern int cmpsatrns __P((const struct satrns *, const struct satrns *));
extern int set_satrnsbysainfo __P((struct saproto *, struct sainfo *));
extern struct saprop *aproppair2saprop __P((struct prop_pair *));
extern void free_proppair __P((struct prop_pair **));
extern void flushsaprop __P((struct saprop *));
extern void flushsaproto __P((struct saproto *));
extern void flushsatrns __P((struct satrns *));
extern void printsaprop __P((const int, const struct saprop *));
extern void printsaprop0 __P((const int, const struct saprop *));
extern void printsaproto __P((const int, const struct saproto *));
extern void printsatrns __P((const int, const int, const struct satrns *));
extern void print_proppair0 __P((int, struct prop_pair *, int));
extern void print_proppair __P((int, struct prop_pair *));
extern int set_proposal_from_policy __P((struct ph2handle *,
struct secpolicy *, struct secpolicy *));
extern int set_proposal_from_proposal __P((struct ph2handle *));