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key.c
7987 lines (7017 loc) · 187 KB
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key.c
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/* $NetBSD: key.c,v 1.126 2004/12/06 08:07:28 itojun Exp $ */
/* $KAME: key.c,v 1.310 2003/09/08 02:23:44 itojun 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.
*/
/*
* This code is referred to RFC 2367
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: key.c,v 1.126 2004/12/06 08:07:28 itojun Exp $");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "fs_kernfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#endif /* INET6 */
#ifdef INET
#include <netinet/in_pcb.h>
#endif
#ifdef INET6
#include <netinet6/in6_pcb.h>
#endif /* INET6 */
#include <net/pfkeyv2.h>
#include <netkey/keydb.h>
#include <netkey/key.h>
#include <netkey/keysock.h>
#include <netkey/key_debug.h>
#include <netinet6/ipsec.h>
#include <netinet6/ah.h>
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#endif
#include <netinet6/ipcomp.h>
#ifdef KERNFS
#include <miscfs/kernfs/kernfs.h>
#endif
#include <machine/stdarg.h>
#include "rnd.h"
#if NRND > 0
#include <sys/rnd.h>
#endif
#include <net/net_osdep.h>
#ifndef offsetof
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
#ifndef satosin
#define satosin(s) ((struct sockaddr_in *)s)
#endif
#define FULLMASK 0xff
/*
* Note on SA reference counting:
* - SAs that are not in DEAD state will have (total external reference + 1)
* following value in reference count field. they cannot be freed and are
* referenced from SA header.
* - SAs that are in DEAD state will have (total external reference)
* in reference count field. they are ready to be freed. reference from
* SA header will be removed in keydb_delsecasvar(), when the reference count
* field hits 0 (= no external reference other than from SA header.
*/
u_int32_t key_debug_level = 0;
static u_int key_spi_trycnt = 1000;
static u_int32_t key_spi_minval = 0x100;
static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */
static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/
static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/
static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/
static u_int32_t acq_seq = 0;
struct _satailq satailq; /* list of all SAD entry */
struct _sptailq sptailq; /* SPD table + pcb */
static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD table */
static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */
static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
/* registed list */
#define SPIHASHSIZE 128
#define SPIHASH(x) (((x) ^ ((x) >> 16)) % SPIHASHSIZE)
static LIST_HEAD(_spihash, secasvar) spihash[SPIHASHSIZE];
#ifndef IPSEC_NONBLOCK_ACQUIRE
static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */
#endif
static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */
struct key_cb key_cb;
/* search order for SAs */
static const u_int saorder_state_valid[] = {
SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
/*
* This order is important because we must select a oldest SA
* for outbound processing. For inbound, This is not important.
*/
};
static const u_int saorder_state_alive[] = {
/* except DEAD */
SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
};
static const u_int saorder_state_any[] = {
SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
};
static const int minsize[] = {
sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
sizeof(struct sadb_sa), /* SADB_EXT_SA */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
0, /* SADB_X_EXT_KMPRIVATE */
sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
#ifdef SADB_X_EXT_TAG
sizeof(struct sadb_x_tag), /* SADB_X_TAG */
#endif
};
static const int maxsize[] = {
sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
sizeof(struct sadb_sa), /* SADB_EXT_SA */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
0, /* SADB_EXT_ADDRESS_SRC */
0, /* SADB_EXT_ADDRESS_DST */
0, /* SADB_EXT_ADDRESS_PROXY */
0, /* SADB_EXT_KEY_AUTH */
0, /* SADB_EXT_KEY_ENCRYPT */
0, /* SADB_EXT_IDENTITY_SRC */
0, /* SADB_EXT_IDENTITY_DST */
0, /* SADB_EXT_SENSITIVITY */
0, /* SADB_EXT_PROPOSAL */
0, /* SADB_EXT_SUPPORTED_AUTH */
0, /* SADB_EXT_SUPPORTED_ENCRYPT */
sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
0, /* SADB_X_EXT_KMPRIVATE */
0, /* SADB_X_EXT_POLICY */
sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
#ifdef SADB_X_EXT_TAG
sizeof(struct sadb_x_tag), /* SADB_X_TAG */
#endif
};
static int ipsec_esp_keymin = 256;
static int ipsec_esp_auth = 0;
static int ipsec_ah_keymin = 128;
#define __LIST_CHAINED(elm) \
(!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
#define LIST_INSERT_TAIL(head, elm, type, field) \
do {\
struct type *curelm = LIST_FIRST(head); \
if (curelm == NULL) {\
LIST_INSERT_HEAD(head, elm, field); \
} else { \
while (LIST_NEXT(curelm, field)) \
curelm = LIST_NEXT(curelm, field);\
LIST_INSERT_AFTER(curelm, elm, field);\
}\
} while (/*CONSTCOND*/ 0)
#define KEY_CHKSASTATE(head, sav, name) \
do { \
if ((head) != (sav)) { \
ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%u SA=%u)\n", \
(name), (head), (sav))); \
continue; \
} \
} while (/*CONSTCOND*/ 0)
#define KEY_CHKSPDIR(head, sp, name) \
do { \
if ((head) != (sp)) { \
ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%u SP=%u), " \
"anyway continue.\n", \
(name), (head), (sp))); \
} \
} while (/*CONSTCOND*/ 0)
#if 1
#define KMALLOC(p, t, n) \
((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT))
#define KFREE(p) \
free((caddr_t)(p), M_SECA)
#else
#define KMALLOC(p, t, n) \
do { \
((p) = (t)malloc((unsigned long)(n), M_SECA, M_NOWAIT)); \
printf("%s %d: %p <- KMALLOC(%s, %d)\n", \
__FILE__, __LINE__, (p), #t, n); \
} while (/*CONSTCOND*/ 0)
#define KFREE(p) \
do { \
printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \
free((caddr_t)(p), M_SECA); \
} while (/*CONSTCOND*/ 0)
#endif
/*
* set parameters into secpolicyindex buffer.
* Must allocate secpolicyindex buffer passed to this function.
*/
#define KEY_SETSECSPIDX(s, d, ps, pd, ulp, idx) \
do { \
bzero((idx), sizeof(struct secpolicyindex)); \
(idx)->prefs = (ps); \
(idx)->prefd = (pd); \
(idx)->ul_proto = (ulp); \
bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len); \
} while (/*CONSTCOND*/ 0)
/*
* set parameters into secasindex buffer.
* Must allocate secasindex buffer before calling this function.
*/
#define KEY_SETSECASIDX(p, m, r, s, d, idx) \
do { \
bzero((idx), sizeof(struct secasindex)); \
(idx)->proto = (p); \
(idx)->mode = (m); \
(idx)->reqid = (r); \
bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len); \
bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len); \
} while (/*CONSTCOND*/ 0)
/* key statistics */
struct _keystat {
u_long getspi_count; /* the avarage of count to try to get new SPI */
} keystat;
struct sadb_msghdr {
struct sadb_msg *msg;
struct sadb_ext *ext[SADB_EXT_MAX + 1];
int extoff[SADB_EXT_MAX + 1];
int extlen[SADB_EXT_MAX + 1];
};
static struct secasvar *key_allocsa_policy __P((struct secasindex *));
static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int));
static void key_delsav __P((struct secasvar *));
static void key_delsp __P((struct secpolicy *));
static struct secpolicy *key_getsp __P((struct secpolicyindex *, int));
#ifdef SADB_X_EXT_TAG
static struct secpolicy *key_getspbytag __P((u_int16_t, int));
#endif
static u_int16_t key_newreqid __P((void));
static struct mbuf *key_gather_mbuf __P((struct mbuf *,
const struct sadb_msghdr *, int, int, ...));
static int key_spdadd __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_spddelete __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_spddelete2 __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_spdget __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_spdflush __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_spddump __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static struct mbuf *key_setspddump __P((int *));
static u_int key_getspreqmsglen __P((struct secpolicy *));
static int key_spdexpire __P((struct secpolicy *));
static struct secashead *key_newsah __P((struct secasindex *));
static void key_delsah __P((struct secashead *));
static struct secasvar *key_newsav __P((struct mbuf *,
const struct sadb_msghdr *, struct secashead *, int *));
static struct secashead *key_getsah __P((struct secasindex *));
static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t));
static void key_setspi __P((struct secasvar *, u_int32_t));
static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t));
static int key_setsaval __P((struct secasvar *, struct mbuf *,
const struct sadb_msghdr *));
static int key_mature __P((struct secasvar *));
static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t,
u_int8_t, u_int32_t, u_int32_t));
static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t,
u_int32_t, pid_t, u_int16_t));
static struct mbuf *key_setsadbsa __P((struct secasvar *));
static struct mbuf *key_setsadbaddr __P((u_int16_t,
struct sockaddr *, u_int8_t, u_int16_t));
#if 0
static struct mbuf *key_setsadbident __P((u_int16_t, u_int16_t, caddr_t,
int, u_int64_t));
#endif
static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int16_t));
#ifdef SADB_X_EXT_TAG
static struct mbuf *key_setsadbxtag __P((u_int16_t));
#endif
static struct mbuf *key_setsadblifetime __P((u_int16_t, u_int32_t,
u_int64_t, u_int64_t, u_int64_t));
static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t,
u_int32_t));
static void *key_newbuf __P((const void *, u_int));
static int key_ismyaddr __P((struct sockaddr *));
#ifdef INET6
static int key_ismyaddr6 __P((struct sockaddr_in6 *));
#endif
static int key_cmpsaidx_exactly
__P((struct secasindex *, struct secasindex *));
static int key_cmpsaidx_withmode
__P((struct secasindex *, struct secasindex *));
static int key_cmpsaidx_withoutmode
__P((struct secasindex *, struct secasindex *));
static int key_sockaddrcmp __P((struct sockaddr *, struct sockaddr *, int));
static int key_bbcmp __P((caddr_t, caddr_t, u_int));
static u_long key_random __P((void));
static u_int16_t key_satype2proto __P((u_int8_t));
static u_int8_t key_proto2satype __P((u_int16_t));
static int key_getspi __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static u_int32_t key_do_getnewspi __P((struct sadb_spirange *,
struct secasindex *));
static int key_update __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
#ifdef IPSEC_DOSEQCHECK
static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t));
#endif
static int key_add __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_setident __P((struct secashead *, struct mbuf *,
const struct sadb_msghdr *));
static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *,
const struct sadb_msghdr *));
static int key_delete __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_get __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static void key_getcomb_setlifetime __P((struct sadb_comb *));
#ifdef IPSEC_ESP
static struct mbuf *key_getcomb_esp __P((void));
#endif
static struct mbuf *key_getcomb_ah __P((void));
static struct mbuf *key_getcomb_ipcomp __P((void));
static struct mbuf *key_getprop __P((const struct secasindex *));
static int key_acquire __P((struct secasindex *, struct secpolicy *));
#ifndef IPSEC_NONBLOCK_ACQUIRE
static struct secacq *key_newacq __P((struct secasindex *));
static struct secacq *key_getacq __P((struct secasindex *));
static struct secacq *key_getacqbyseq __P((u_int32_t));
#endif
static struct secspacq *key_newspacq __P((struct secpolicyindex *));
static struct secspacq *key_getspacq __P((struct secpolicyindex *));
static int key_acquire2 __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_register __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_expire __P((struct secasvar *));
static int key_flush __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_dump __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static struct mbuf *key_setdump __P((u_int8_t, int *));
static int key_promisc __P((struct socket *, struct mbuf *,
const struct sadb_msghdr *));
static int key_senderror __P((struct socket *, struct mbuf *, int));
static int key_validate_ext __P((const struct sadb_ext *, int));
static int key_align __P((struct mbuf *, struct sadb_msghdr *));
#if 0
static const char *key_getfqdn __P((void));
static const char *key_getuserfqdn __P((void));
#endif
static void key_sa_chgstate __P((struct secasvar *, u_int8_t));
static void key_sp_dead __P((struct secpolicy *));
static void key_sp_unlink __P((struct secpolicy *));
static struct mbuf *key_alloc_mbuf __P((int));
struct callout key_timehandler_ch;
/* %%% IPsec policy management */
/*
* allocating a SP for OUTBOUND or INBOUND packet.
* Must call key_freesp() later.
* OUT: NULL: not found
* others: found and return the pointer.
*/
struct secpolicy *
key_allocsp(tag, spidx, dir)
u_int16_t tag;
struct secpolicyindex *spidx;
u_int dir;
{
struct secpolicy *sp;
int s;
/* check direction */
switch (dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
panic("key_allocsp: Invalid direction is passed.");
}
/* get a SP entry */
s = splsoftnet(); /*called from softclock()*/
if (spidx) {
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("*** objects\n");
kdebug_secpolicyindex(spidx));
}
LIST_FOREACH(sp, &sptree[dir], chain) {
if (sp->state == IPSEC_SPSTATE_DEAD)
continue;
if (!sp->spidx) {
if (!tag)
continue;
if (sp->tag == tag)
goto found;
} else {
if (!spidx)
continue;
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("*** in SPD\n");
kdebug_secpolicyindex(sp->spidx));
if (key_cmpspidx_withmask(sp->spidx, spidx))
goto found;
}
}
splx(s);
return NULL;
found:
/* sanity check */
KEY_CHKSPDIR(sp->dir, dir, "key_allocsp");
/* found a SPD entry */
sp->lastused = time.tv_sec;
sp->refcnt++;
splx(s);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP key_allocsp cause refcnt++:%d SP:%p\n",
sp->refcnt, sp));
return sp;
}
/*
* allocating an SA entry for an *OUTBOUND* packet.
* checking each request entries in SP, and acquire an SA if need.
* OUT: 0: there are valid requests.
* ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
*/
int
key_checkrequest(isr, saidx)
struct ipsecrequest *isr;
struct secasindex *saidx;
{
u_int level;
int error;
/* sanity check */
if (isr == NULL || saidx == NULL)
panic("key_checkrequest: NULL pointer is passed.");
/* check mode */
switch (saidx->mode) {
case IPSEC_MODE_TRANSPORT:
case IPSEC_MODE_TUNNEL:
break;
case IPSEC_MODE_ANY:
default:
panic("key_checkrequest: Invalid policy defined.");
}
/* get current level */
level = ipsec_get_reqlevel(isr, saidx->src.ss_family);
#if 0
/*
* We do allocate new SA only if the state of SA in the holder is
* SADB_SASTATE_DEAD. The SA for outbound must be the oldest.
*/
if (isr->sav != NULL) {
if (isr->sav->sah == NULL)
panic("key_checkrequest: sah is null.");
if (isr->sav ==
LIST_FIRST(&isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP checkrequest calls free SA:%p\n",
isr->sav));
key_freesav(isr->sav);
isr->sav = NULL;
}
}
#else
/*
* we free any SA stashed in the IPsec request because a different
* SA may be involved each time this request is checked, either
* because new SAs are being configured, or this request is
* associated with an unconnected datagram socket, or this request
* is associated with a system default policy.
*
* The operation may have negative impact to performance. We may
* want to check cached SA carefully, rather than picking new SA
* every time.
*/
if (isr->sav != NULL) {
key_freesav(isr->sav);
isr->sav = NULL;
}
#endif
/*
* new SA allocation if no SA found.
* key_allocsa_policy should allocate the oldest SA available.
* See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
*/
if (isr->sav == NULL)
isr->sav = key_allocsa_policy(saidx);
/* When there is SA. */
if (isr->sav != NULL)
return 0;
/* there is no SA */
if ((error = key_acquire(saidx, isr->sp)) != 0) {
/* XXX What should I do ? */
ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned "
"from key_acquire.\n", error));
return error;
}
return level == IPSEC_LEVEL_REQUIRE ? ENOENT : 0;
}
/*
* allocating a SA for policy entry from SAD.
* NOTE: searching SAD of aliving state.
* OUT: NULL: not found.
* others: found and return the pointer.
*/
static struct secasvar *
key_allocsa_policy(saidx)
struct secasindex *saidx;
{
struct secashead *sah;
struct secasvar *sav;
u_int stateidx, state;
LIST_FOREACH(sah, &sahtree, chain) {
if (sah->state == SADB_SASTATE_DEAD)
continue;
if (key_cmpsaidx_withmode(&sah->saidx, saidx))
goto found;
}
return NULL;
found:
/* search valid state */
for (stateidx = 0;
stateidx < _ARRAYLEN(saorder_state_valid);
stateidx++) {
state = saorder_state_valid[stateidx];
sav = key_do_allocsa_policy(sah, state);
if (sav != NULL)
return sav;
}
return NULL;
}
/*
* searching SAD with direction, protocol, mode and state.
* called by key_allocsa_policy().
* OUT:
* NULL : not found
* others : found, pointer to a SA.
*/
static struct secasvar *
key_do_allocsa_policy(sah, state)
struct secashead *sah;
u_int state;
{
struct secasvar *sav, *candidate;
/* initilize */
candidate = NULL;
LIST_FOREACH(sav, &sah->savtree[state], chain) {
/* sanity check */
KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy");
/* initialize */
if (candidate == NULL) {
candidate = sav;
continue;
}
/* Which SA is the better ? */
/* sanity check 2 */
if (candidate->lft_c == NULL || sav->lft_c == NULL)
panic("key_do_allocsa_policy: "
"lifetime_current is NULL.");
/* XXX What the best method is to compare ? */
if (candidate->lft_c->sadb_lifetime_addtime >
sav->lft_c->sadb_lifetime_addtime) {
candidate = sav;
continue;
}
}
if (candidate) {
candidate->refcnt++;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP allocsa_policy cause "
"refcnt++:%d SA:%p\n",
candidate->refcnt, candidate));
}
return candidate;
}
/*
* allocating a SA entry for a *INBOUND* packet.
* Must call key_freesav() later.
* OUT: positive: pointer to a sav.
* NULL: not found, or error occurred.
*
* In the comparison, source address will be ignored for RFC2401 conformance.
* To quote, from section 4.1:
* A security association is uniquely identified by a triple consisting
* of a Security Parameter Index (SPI), an IP Destination Address, and a
* security protocol (AH or ESP) identifier.
* Note that, however, we do need to keep source address in IPsec SA.
* IKE specification and PF_KEY specification do assume that we
* keep source address in IPsec SA. We see a tricky situation here.
*/
struct secasvar *
key_allocsa(family, src, dst, proto, spi)
u_int family, proto;
caddr_t src, dst;
u_int32_t spi;
{
struct secasvar *sav, *match;
u_int stateidx, state, tmpidx, matchidx;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
int s;
/* sanity check */
if (src == NULL || dst == NULL)
panic("key_allocsa: NULL pointer is passed.");
/*
* searching SAD.
* XXX: to be checked internal IP header somewhere. Also when
* IPsec tunnel packet is received. But ESP tunnel mode is
* encrypted so we can't check internal IP header.
*/
s = splsoftnet(); /*called from softclock()*/
/* search valid state */
match = NULL;
matchidx = _ARRAYLEN(saorder_state_valid);
LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
if (sav->spi != spi)
continue;
if (proto != sav->sah->saidx.proto)
continue;
if (family != sav->sah->saidx.src.ss_family ||
family != sav->sah->saidx.dst.ss_family)
continue;
tmpidx = _ARRAYLEN(saorder_state_valid);
for (stateidx = 0; stateidx < matchidx; stateidx++) {
state = saorder_state_valid[stateidx];
if (sav->state == state) {
tmpidx = stateidx;
break;
}
}
if (tmpidx >= matchidx)
continue;
#if 0 /* don't check src */
/* check src address */
switch (family) {
case AF_INET:
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
bcopy(src, &sin.sin_addr,
sizeof(sin.sin_addr));
if (key_sockaddrcmp((struct sockaddr*)&sin,
(struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
continue;
break;
case AF_INET6:
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(sin6);
bcopy(src, &sin6.sin6_addr,
sizeof(sin6.sin6_addr));
if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) {
/* kame fake scopeid */
sin6.sin6_scope_id =
ntohs(sin6.sin6_addr.s6_addr16[1]);
sin6.sin6_addr.s6_addr16[1] = 0;
}
if (key_sockaddrcmp((struct sockaddr*)&sin6,
(struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
continue;
break;
default:
ipseclog((LOG_DEBUG, "key_allocsa: "
"unknown address family=%d.\n",
family));
continue;
}
#endif
/* check dst address */
switch (family) {
case AF_INET:
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
bcopy(dst, &sin.sin_addr,
sizeof(sin.sin_addr));
if (key_sockaddrcmp((struct sockaddr*)&sin,
(struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
continue;
break;
case AF_INET6:
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(sin6);
bcopy(dst, &sin6.sin6_addr,
sizeof(sin6.sin6_addr));
if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) {
/* kame fake scopeid */
sin6.sin6_scope_id =
ntohs(sin6.sin6_addr.s6_addr16[1]);
sin6.sin6_addr.s6_addr16[1] = 0;
}
if (key_sockaddrcmp((struct sockaddr*)&sin6,
(struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
continue;
break;
default:
ipseclog((LOG_DEBUG, "key_allocsa: "
"unknown address family=%d.\n", family));
continue;
}
match = sav;
matchidx = tmpidx;
}
if (match)
goto found;
/* not found */
splx(s);
return NULL;
found:
match->refcnt++;
splx(s);
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP allocsa cause refcnt++:%d SA:%p\n",
match->refcnt, match));
return match;
}
/*
* Must be called after calling key_allocsp().
* For both the packet without socket and key_freeso().
*/
void
key_freesp(sp)
struct secpolicy *sp;
{
/* sanity check */
if (sp == NULL)
panic("key_freesp: NULL pointer is passed.");
sp->refcnt--;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP freesp cause refcnt--:%d SP:%p\n",
sp->refcnt, sp));
if (sp->refcnt == 0)
key_delsp(sp);
return;
}
/*
* Must be called after calling key_allocsa().
* This function is called by key_freesp() to free some SA allocated
* for a policy.
*/
void
key_freesav(sav)
struct secasvar *sav;
{
/* sanity check */
if (sav == NULL)
panic("key_freesav: NULL pointer is passed.");
sav->refcnt--;
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP freesav cause refcnt--:%d SA:%p SPI %u\n",
sav->refcnt, sav, (u_int32_t)ntohl(sav->spi)));
if (sav->refcnt > 0)
return;
key_delsav(sav);
}
static void
key_delsav(sav)
struct secasvar *sav;
{
int s;
/* sanity check */
if (sav == NULL)
panic("key_delsav: NULL pointer is passed.");
if (sav->refcnt > 0)
panic("key_delsav: called with positive refcnt");
s = splsoftnet();
#ifdef KERNFS
kernfs_revoke_sa(sav);
#endif
if (__LIST_CHAINED(sav))
LIST_REMOVE(sav, chain);
if (sav->spihash.le_prev || sav->spihash.le_next)
LIST_REMOVE(sav, spihash);
if (sav->key_auth != NULL) {
bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
KFREE(sav->key_auth);
sav->key_auth = NULL;
}
if (sav->key_enc != NULL) {
bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
KFREE(sav->key_enc);
sav->key_enc = NULL;
}
if (sav->sched) {
bzero(sav->sched, sav->schedlen);
KFREE(sav->sched);
sav->sched = NULL;
}
if (sav->replay != NULL) {
keydb_delsecreplay(sav->replay);
sav->replay = NULL;
}
if (sav->lft_c != NULL) {
KFREE(sav->lft_c);
sav->lft_c = NULL;
}
if (sav->lft_h != NULL) {
KFREE(sav->lft_h);
sav->lft_h = NULL;
}
if (sav->lft_s != NULL) {
KFREE(sav->lft_s);
sav->lft_s = NULL;
}
if (sav->iv != NULL) {
KFREE(sav->iv);
sav->iv = NULL;
}
keydb_delsecasvar(sav);
splx(s);
}
/* %%% SPD management */
/*
* free security policy entry.
*/
static void
key_delsp(sp)
struct secpolicy *sp;
{
int s;
/* sanity check */
if (sp == NULL)
panic("key_delsp: NULL pointer is passed.");
if (sp->refcnt > 0)
panic("key_delsp: called with positive refcnt");
s = splsoftnet(); /*called from softclock()*/
#ifdef KERNFS
kernfs_revoke_sp(sp);
#endif
{
struct ipsecrequest *isr = sp->req, *nextisr;
while (isr != NULL) {