/* $NetBSD: handler.h,v 1.25 2010/11/17 10:40:41 tteras Exp $ */
/* Id: handler.h,v 1.19 2006/02/25 08:25:12 manubsd 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.
*/
#ifndef _HANDLER_H
#define _HANDLER_H
#include <sys/queue.h>
#include <openssl/rsa.h>
#include <sys/time.h>
#include "isakmp_var.h"
#include "oakley.h"
#include "schedule.h"
#include "evt.h"
/* Phase 1 handler */
/*
* main mode:
* initiator responder
* 0 (---) (---)
* 1 start start (1st msg received)
* 2 (---) 1st valid msg received
* 3 1st msg sent 1st msg sent
* 4 1st valid msg received 2st valid msg received
* 5 2nd msg sent 2nd msg sent
* 6 2nd valid msg received 3rd valid msg received
* 7 3rd msg sent 3rd msg sent
* 8 3rd valid msg received (---)
* 9 SA established SA established
*
* aggressive mode:
* initiator responder
* 0 (---) (---)
* 1 start start (1st msg received)
* 2 (---) 1st valid msg received
* 3 1st msg sent 1st msg sent
* 4 1st valid msg received 2st valid msg received
* 5 (---) (---)
* 6 (---) (---)
* 7 (---) (---)
* 8 (---) (---)
* 9 SA established SA established
*
* base mode:
* initiator responder
* 0 (---) (---)
* 1 start start (1st msg received)
* 2 (---) 1st valid msg received
* 3 1st msg sent 1st msg sent
* 4 1st valid msg received 2st valid msg received
* 5 2nd msg sent (---)
* 6 (---) (---)
* 7 (---) (---)
* 8 (---) (---)
* 9 SA established SA established
*/
#define PHASE1ST_SPAWN 0
#define PHASE1ST_START 1
#define PHASE1ST_MSG1RECEIVED 2
#define PHASE1ST_MSG1SENT 3
#define PHASE1ST_MSG2RECEIVED 4
#define PHASE1ST_MSG2SENT 5
#define PHASE1ST_MSG3RECEIVED 6
#define PHASE1ST_MSG3SENT 7
#define PHASE1ST_MSG4RECEIVED 8
#define PHASE1ST_ESTABLISHED 9
#define PHASE1ST_DYING 10
#define PHASE1ST_EXPIRED 11
#define PHASE1ST_MAX 12
/* About address semantics in each case.
* initiator(addr=I) responder(addr=R)
* src dst src dst
* (local) (remote) (local) (remote)
* phase 1 handler I R R I
* phase 2 handler I R R I
* getspi msg R I I R
* acquire msg I R
* ID payload I R I R
*/
#ifdef ENABLE_HYBRID
struct isakmp_cfg_state;
#endif
struct ph1handle {
isakmp_index index;
int status; /* status of this SA */
int side; /* INITIATOR or RESPONDER */
struct sockaddr *remote; /* remote address to negosiate ph1 */
struct sockaddr *local; /* local address to negosiate ph1 */
/* XXX copy from rmconf due to anonymous configuration.
* If anonymous will be forbidden, we do delete them. */
struct remoteconf *rmconf; /* pointer to remote configuration */
struct isakmpsa *approval; /* pointer to SA(s) approved. */
vchar_t *authstr; /* place holder of string for auth. */
/* for example pre-shared key */
u_int8_t version; /* ISAKMP version */
u_int8_t etype; /* Exchange type actually for use */
u_int8_t flags; /* Flags */
u_int32_t msgid; /* message id */
u_int32_t vendorid_mask; /* bitmask of received supported vendor ids*/
#ifdef ENABLE_NATT
struct ph1natt_options *natt_options; /* Selected NAT-T IKE version */
u_int32_t natt_flags; /* NAT-T related flags */
#endif
#ifdef ENABLE_FRAG
int frag; /* IKE phase 1 fragmentation */
struct isakmp_frag_item *frag_chain; /* Received fragments */
#endif
struct sched sce; /* schedule for expire */
struct sched scr; /* schedule for resend */
int retry_counter; /* for resend. */
vchar_t *sendbuf; /* buffer for re-sending */
vchar_t *dhpriv; /* DH; private value */
vchar_t *dhpub; /* DH; public value */
vchar_t *dhpub_p; /* DH; partner's public value */
vchar_t *dhgxy; /* DH; shared secret */
vchar_t *nonce; /* nonce value */
vchar_t *nonce_p; /* partner's nonce value */
vchar_t *skeyid; /* SKEYID */
vchar_t *skeyid_d; /* SKEYID_d */
vchar_t *skeyid_a; /* SKEYID_a, i.e. hash */
vchar_t *skeyid_e; /* SKEYID_e, i.e. encryption */
vchar_t *key; /* cipher key */
vchar_t *hash; /* HASH minus general header */
vchar_t *sig; /* SIG minus general header */
vchar_t *sig_p; /* peer's SIG minus general header */
vchar_t *cert; /* CERT minus general header */
vchar_t *cert_p; /* peer's CERT minus general header */
vchar_t *crl_p; /* peer's CRL minus general header */
vchar_t *cr_p; /* peer's CR not including general */
RSA *rsa; /* my RSA key */
RSA *rsa_p; /* peer's RSA key */
struct genlist *rsa_candidates; /* possible candidates for peer's RSA key */
vchar_t *id; /* ID minus gen header */
vchar_t *id_p; /* partner's ID minus general header */
/* i.e. struct ipsecdoi_id_b*. */
struct isakmp_ivm *ivm; /* IVs */
vchar_t *sa; /* whole SA payload to send/to be sent*/
/* to calculate HASH */
/* NOT INCLUDING general header. */
vchar_t *sa_ret; /* SA payload to reply/to be replyed */
/* NOT INCLUDING general header. */
/* NOTE: Should be release after use. */
#ifdef HAVE_GSSAPI
void *gssapi_state; /* GSS-API specific state. */
/* Allocated when needed */
vchar_t *gi_i; /* optional initiator GSS id */
vchar_t *gi_r; /* optional responder GSS id */
#endif
struct isakmp_pl_hash *pl_hash; /* pointer to hash payload */
time_t created; /* timestamp for establish */
int initial_contact_received; /* set if initial contact received */
#ifdef ENABLE_STATS
struct timeval start;
struct timeval end;
#endif
#ifdef ENABLE_DPD
int dpd_support; /* Does remote supports DPD ? */
u_int32_t dpd_last_ack;
u_int32_t dpd_seq; /* DPD seq number to receive */
u_int8_t dpd_fails; /* number of failures */
struct sched dpd_r_u;
#endif
u_int32_t msgid2; /* msgid counter for Phase 2 */
int ph2cnt; /* the number which is negotiated by this phase 1 */
LIST_HEAD(_ph2ofph1_, ph2handle) ph2tree;
LIST_ENTRY(ph1handle) chain;
#ifdef ENABLE_HYBRID
struct isakmp_cfg_state *mode_cfg; /* ISAKMP mode config state */
#endif
EVT_LISTENER_LIST(evt_listeners);
};
/* For limiting enumeration of ph1 tree */
struct ph1selector {
struct sockaddr *local;
struct sockaddr *remote;
};
/* Phase 2 handler */
/* allocated per a SA or SA bundles of a pair of peer's IP addresses. */
/*
* initiator responder
* 0 (---) (---)
* 1 start start (1st msg received)
* 2 acquire msg get 1st valid msg received
* 3 getspi request sent getspi request sent
* 4 getspi done getspi done
* 5 1st msg sent 1st msg sent
* 6 1st valid msg received 2nd valid msg received
* 7 (commit bit) (commit bit)
* 8 SAs added SAs added
* 9 SAs established SAs established
* 10 SAs expired SAs expired
*/
#define PHASE2ST_SPAWN 0
#define PHASE2ST_START 1
#define PHASE2ST_STATUS2 2
#define PHASE2ST_GETSPISENT 3
#define PHASE2ST_GETSPIDONE 4
#define PHASE2ST_MSG1SENT 5
#define PHASE2ST_STATUS6 6
#define PHASE2ST_COMMIT 7
#define PHASE2ST_ADDSA 8
#define PHASE2ST_ESTABLISHED 9
#define PHASE2ST_EXPIRED 10
#define PHASE2ST_MAX 11
struct ph2handle {
/* source and destination addresses used for IKE exchange. Might
* differ from source and destination of SA. On the initiator,
* they are tweaked if a hint is available in the SPD (set by
* MIGRATE for instance). Otherwise they are the source and
* destination of SA for transport mode and the tunnel endpoints
* for tunnel mode */
struct sockaddr *src;
struct sockaddr *dst;
/* source and destination addresses of the SA in the case addresses
* used for IKE exchanges (src and dst) do differ. On the initiator,
* they are set (if needed) in pk_recvacquire(). On the responder,
* they are _derived_ from the local and remote parameters of the
* SP, if available. */
struct sockaddr *sa_src;
struct sockaddr *sa_dst;
/* Store our Phase 2 ID and the peer ID (ID minus general header).
* On the initiator, they are set during ACQUIRE processing.
* On the responder, they are set from the content of ID payload
* in quick_r1recv(). Then, if they are of type address or
* tunnel, they are compared to sainfo selectors.
*/
vchar_t *id; /* ID minus gen header */
vchar_t *id_p; /* peer's ID minus general header */
#ifdef ENABLE_NATT
struct sockaddr *natoa_src; /* peer's view of my address */
struct sockaddr *natoa_dst; /* peer's view of his address */
#endif
u_int32_t spid; /* policy id by kernel */
int status; /* ipsec sa status */
u_int8_t side; /* INITIATOR or RESPONDER */
struct sched sce; /* schedule for expire */
struct sched scr; /* schedule for resend */
int retry_counter; /* for resend. */
vchar_t *sendbuf; /* buffer for re-sending */
vchar_t *msg1; /* buffer for re-sending */
/* used for responder's first message */
int retry_checkph1; /* counter to wait phase 1 finished. */
/* NOTE: actually it's timer. */
u_int32_t seq; /* sequence number used by PF_KEY */
/*
* NOTE: In responder side, we can't identify each SAs
* with same destination address for example, when
* socket based SA is required. So we set a identifier
* number to "seq", and sent kernel by pfkey.
*/
u_int8_t satype; /* satype in PF_KEY */
/*
* saved satype in the original PF_KEY request from
* the kernel in order to reply a error.
*/
u_int8_t flags; /* Flags for phase 2 */
u_int32_t msgid; /* msgid for phase 2 */
struct sainfo *sainfo; /* place holder of sainfo */
struct saprop *proposal; /* SA(s) proposal. */
struct saprop *approval; /* SA(s) approved. */
u_int32_t lifetime_secs; /* responder lifetime (seconds) */
u_int32_t lifetime_kb; /* responder lifetime (kbytes) */
caddr_t spidx_gen; /* policy from peer's proposal */
struct dhgroup *pfsgrp; /* DH; prime number */
vchar_t *dhpriv; /* DH; private value */
vchar_t *dhpub; /* DH; public value */
vchar_t *dhpub_p; /* DH; partner's public value */
vchar_t *dhgxy; /* DH; shared secret */
vchar_t *nonce; /* nonce value in phase 2 */
vchar_t *nonce_p; /* partner's nonce value in phase 2 */
vchar_t *sa; /* whole SA payload to send/to be sent*/
/* to calculate HASH */
/* NOT INCLUDING general header. */
vchar_t *sa_ret; /* SA payload to reply/to be replyed */
/* NOT INCLUDING general header. */
/* NOTE: Should be release after use. */
struct isakmp_ivm *ivm; /* IVs */
int generated_spidx; /* mark handlers whith generated policy */
#ifdef ENABLE_STATS
struct timeval start;
struct timeval end;
#endif
struct ph1handle *ph1; /* back pointer to isakmp status */
LIST_ENTRY(ph2handle) chain;
LIST_ENTRY(ph2handle) ph1bind; /* chain to ph1handle */
EVT_LISTENER_LIST(evt_listeners);
};
/* For limiting enumeration of ph2 tree */
struct ph2selector {
u_int32_t spid;
struct sockaddr *src;
struct sockaddr *dst;
};
/*
* for handling initial contact.
*/
struct contacted {
struct sockaddr *remote; /* remote address to negosiate ph1 */
LIST_ENTRY(contacted) chain;
};
/*
* for checking a packet retransmited.
*/
struct recvdpkt {
struct sockaddr *remote; /* the remote address */
struct sockaddr *local; /* the local address */
vchar_t *hash; /* hash of the received packet */
vchar_t *sendbuf; /* buffer for the response */
int retry_counter; /* how many times to send */
struct timeval time_send; /* timestamp of previous send */
LIST_ENTRY(recvdpkt) chain;
};
/* for parsing ISAKMP header. */
struct isakmp_parse_t {
u_char type; /* payload type of mine */
int len; /* ntohs(ptr->len) */
struct isakmp_gen *ptr;
};
/*
* for IV management.
*
* - normal case
* initiator responder
* ------------------------- --------------------------
* initialize iv(A), ive(A). initialize iv(A), ive(A).
* encode by ive(A).
* save to iv(B). ---[packet(B)]--> save to ive(B).
* decode by iv(A).
* packet consistency.
* sync iv(B) with ive(B).
* check auth, integrity.
* encode by ive(B).
* save to ive(C). <--[packet(C)]--- save to iv(C).
* decoded by iv(B).
* :
*
* - In the case that a error is found while cipher processing,
* initiator responder
* ------------------------- --------------------------
* initialize iv(A), ive(A). initialize iv(A), ive(A).
* encode by ive(A).
* save to iv(B). ---[packet(B)]--> save to ive(B).
* decode by iv(A).
* packet consistency.
* sync iv(B) with ive(B).
* check auth, integrity.
* error found.
* create notify.
* get ive2(X) from iv(B).
* encode by ive2(X).
* get iv2(X) from iv(B). <--[packet(Y)]--- save to iv2(Y).
* save to ive2(Y).
* decoded by iv2(X).
* :
*
* The reason why the responder synchronizes iv with ive after checking the
* packet consistency is that it is required to leave the IV for decoding
* packet. Because there is a potential of error while checking the packet
* consistency. Also the reason why that is before authentication and
* integirty check is that the IV for informational exchange has to be made
* by the IV which is after packet decoded and checking the packet consistency.
* Otherwise IV mismatched happens between the intitiator and the responder.
*/
struct isakmp_ivm {
vchar_t *iv; /* for decoding packet */
/* if phase 1, it's for computing phase2 iv */
vchar_t *ive; /* for encoding packet */
};
/* for dumping */
struct ph1dump {
isakmp_index index;
int status;
int side;
struct sockaddr_storage remote;
struct sockaddr_storage local;
u_int8_t version;
u_int8_t etype;
time_t created;
int ph2cnt;
};
struct sockaddr;
struct ph1handle;
struct ph2handle;
struct policyindex;
extern struct ph1handle *getph1byindex __P((isakmp_index *));
extern struct ph1handle *getph1byindex0 __P((isakmp_index *));
extern int enumph1 __P((struct ph1selector *ph1sel,
int (* enum_func)(struct ph1handle *iph1, void *arg),
void *enum_arg));
#define GETPH1_F_ESTABLISHED 0x0001
extern struct ph1handle *getph1 __P((struct ph1handle *ph1hint,
struct sockaddr *local,
struct sockaddr *remote,
int flags));
#define getph1byaddr(local, remote, est) \
getph1(NULL, local, remote, est ? GETPH1_F_ESTABLISHED : 0)
#define getph1bydstaddr(remote) \
getph1(NULL, NULL, remote, 0)
#ifdef ENABLE_HYBRID
struct ph1handle *getph1bylogin __P((char *));
int purgeph1bylogin __P((char *));
#endif
extern void migrate_ph12 __P((struct ph1handle *old_iph1, struct ph1handle *new_iph1));
extern void migrate_dying_ph12 __P((struct ph1handle *iph1));
extern vchar_t *dumpph1 __P((void));
extern struct ph1handle *newph1 __P((void));
extern void delph1 __P((struct ph1handle *));
extern int insph1 __P((struct ph1handle *));
extern void remph1 __P((struct ph1handle *));
extern int resolveph1rmconf __P((struct ph1handle *));
extern void flushph1 __P((void));
extern void initph1tree __P((void));
extern int ph1_rekey_enabled __P((struct ph1handle *));
extern int enumph2 __P((struct ph2selector *ph2sel,
int (* enum_func)(struct ph2handle *iph2, void *arg),
void *enum_arg));
extern struct ph2handle *getph2byseq __P((u_int32_t));
extern struct ph2handle *getph2bysaddr __P((struct sockaddr *,
struct sockaddr *));
extern struct ph2handle *getph2bymsgid __P((struct ph1handle *, u_int32_t));
extern struct ph2handle *getph2byid __P((struct sockaddr *,
struct sockaddr *, u_int32_t));
extern struct ph2handle *getph2bysaidx __P((struct sockaddr *,
struct sockaddr *, u_int, u_int32_t));
extern struct ph2handle *newph2 __P((void));
extern void initph2 __P((struct ph2handle *));
extern void delph2 __P((struct ph2handle *));
extern int insph2 __P((struct ph2handle *));
extern void remph2 __P((struct ph2handle *));
extern void flushph2 __P((void));
extern void deleteallph2 __P((struct sockaddr *, struct sockaddr *, u_int));
extern void initph2tree __P((void));
extern void bindph12 __P((struct ph1handle *, struct ph2handle *));
extern void unbindph12 __P((struct ph2handle *));
extern struct contacted *getcontacted __P((struct sockaddr *));
extern int inscontacted __P((struct sockaddr *));
extern void remcontacted __P((struct sockaddr *));
extern void initctdtree __P((void));
extern int check_recvdpkt __P((struct sockaddr *,
struct sockaddr *, vchar_t *));
extern int add_recvdpkt __P((struct sockaddr *, struct sockaddr *,
vchar_t *, vchar_t *));
extern void init_recvdpkt __P((void));
#ifdef ENABLE_HYBRID
extern int exclude_cfg_addr __P((const struct sockaddr *));
#endif
extern int revalidate_ph12(void);
#endif /* _HANDLER_H */
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