/* $NetBSD: key.c,v 1.63 2010/01/31 00:43:38 hubertf Exp $ */ /* $FreeBSD: src/sys/netipsec/key.c,v 1.3.2.3 2004/02/14 22:23:23 bms Exp $ */ /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 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 __KERNEL_RCSID(0, "$NetBSD: key.c,v 1.63 2010/01/31 00:43:38 hubertf Exp $"); /* * This code is referd to RFC 2367 */ #include "opt_inet.h" #ifdef __FreeBSD__ #include "opt_inet6.h" #endif #include "opt_ipsec.h" #ifdef __NetBSD__ #include "opt_gateway.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #endif #ifdef INET6 #include #include #include #endif /* INET6 */ #ifdef INET #include #endif #ifdef INET6 #include #endif /* INET6 */ #include #include #include #include #include #include #ifdef INET6 #include #endif #include #include #include #include #include #include #define FULLMASK 0xff #define _BITS(bytes) ((bytes) << 3) percpu_t *pfkeystat_percpu; /* * 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 key_delsav(), 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_int32_t policy_id = 0; static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/ 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 int key_prefered_oldsa = 0; /* prefered old sa rather than new sa.*/ static u_int32_t acq_seq = 0; static int key_tick_init_random = 0; static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; /* registed list */ #ifndef IPSEC_NONBLOCK_ACQUIRE static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ #endif static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ /* search order for SAs */ static u_int saorder_state_valid[] = { SADB_SASTATE_DYING, SADB_SASTATE_MATURE, /* * This order is important because we must select the oldest SA * for outbound processing. For inbound, This is not important. */ }; static u_int saorder_state_alive[] = { /* except DEAD */ SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL }; static 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 */ sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */ sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */ sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */ sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OA */ sizeof(struct sadb_x_nat_t_frag), /* SADB_X_EXT_NAT_T_FRAG */ }; 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 */ sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */ sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */ sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */ 0, /* SADB_X_EXT_NAT_T_OA */ sizeof(struct sadb_x_nat_t_frag), /* SADB_X_EXT_NAT_T_FRAG */ }; static int ipsec_esp_keymin = 256; static int ipsec_esp_auth = 0; static int ipsec_ah_keymin = 128; #ifdef SYSCTL_DECL SYSCTL_DECL(_net_key); #endif #ifdef SYSCTL_INT SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \ &key_debug_level, 0, ""); /* max count of trial for the decision of spi value */ SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \ &key_spi_trycnt, 0, ""); /* minimum spi value to allocate automatically. */ SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \ &key_spi_minval, 0, ""); /* maximun spi value to allocate automatically. */ SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \ &key_spi_maxval, 0, ""); /* interval to initialize randseed */ SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \ &key_int_random, 0, ""); /* lifetime for larval SA */ SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \ &key_larval_lifetime, 0, ""); /* counter for blocking to send SADB_ACQUIRE to IKEd */ SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \ &key_blockacq_count, 0, ""); /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \ &key_blockacq_lifetime, 0, ""); /* ESP auth */ SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \ &ipsec_esp_auth, 0, ""); /* minimum ESP key length */ SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \ &ipsec_esp_keymin, 0, ""); /* minimum AH key length */ SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \ &ipsec_ah_keymin, 0, ""); /* perfered old SA rather than new SA */ SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, prefered_oldsa, CTLFLAG_RW,\ &key_prefered_oldsa, 0, ""); #endif /* SYSCTL_INT */ #ifndef LIST_FOREACH #define LIST_FOREACH(elm, head, field) \ for (elm = LIST_FIRST(head); elm; elm = LIST_NEXT(elm, field)) #endif #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 (0) #define KEY_CHKSASTATE(head, sav, name) \ /* do */ { \ if ((head) != (sav)) { \ ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ (name), (head), (sav))); \ continue; \ } \ } /* while (0) */ #define KEY_CHKSPDIR(head, sp, name) \ do { \ if ((head) != (sp)) { \ ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ "anyway continue.\n", \ (name), (head), (sp))); \ } \ } while (0) MALLOC_DEFINE(M_SECA, "key mgmt", "security associations, key management"); #if 1 #define KMALLOC(p, t, n) \ ((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT)) #define KFREE(p) \ free((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 (0) #define KFREE(p) \ do { \ printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \ free((p), M_SECA); \ } while (0) #endif /* * set parameters into secpolicyindex buffer. * Must allocate secpolicyindex buffer passed to this function. */ #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ do { \ memset((idx), 0, sizeof(struct secpolicyindex)); \ (idx)->dir = (_dir); \ (idx)->prefs = (ps); \ (idx)->prefd = (pd); \ (idx)->ul_proto = (ulp); \ memcpy(&(idx)->src, (s), ((const struct sockaddr *)(s))->sa_len); \ memcpy(&(idx)->dst, (d), ((const struct sockaddr *)(d))->sa_len); \ } while (0) /* * set parameters into secasindex buffer. * Must allocate secasindex buffer before calling this function. */ static int key_setsecasidx (int, int, int, const struct sadb_address *, const struct sadb_address *, struct secasindex *); /* 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 (const struct secasindex *); static void key_freesp_so (struct secpolicy **); static struct secasvar *key_do_allocsa_policy (struct secashead *, u_int); static void key_delsp (struct secpolicy *); static struct secpolicy *key_getsp (struct secpolicyindex *); static struct secpolicy *key_getspbyid (u_int32_t); static u_int16_t key_newreqid (void); static struct mbuf *key_gather_mbuf (struct mbuf *, const struct sadb_msghdr *, int, int, ...); static int key_spdadd (struct socket *, struct mbuf *, const struct sadb_msghdr *); static u_int32_t key_getnewspid (void); static int key_spddelete (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_spddelete2 (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_spdget (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_spdflush (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_spddump (struct socket *, struct mbuf *, const struct sadb_msghdr *); static struct mbuf * key_setspddump (int *errorp, pid_t); static struct mbuf * key_setspddump_chain (int *errorp, int *lenp, pid_t pid); #ifdef IPSEC_NAT_T static int key_nat_map (struct socket *, struct mbuf *, const struct sadb_msghdr *); #endif static struct mbuf *key_setdumpsp (struct secpolicy *, u_int8_t, u_int32_t, pid_t); static u_int key_getspreqmsglen (struct secpolicy *); static int key_spdexpire (struct secpolicy *); static struct secashead *key_newsah (struct secasindex *); static void key_delsah (struct secashead *); static struct secasvar *key_newsav (struct mbuf *, const struct sadb_msghdr *, struct secashead *, int *, const char*, int); #define KEY_NEWSAV(m, sadb, sah, e) \ key_newsav(m, sadb, sah, e, __FILE__, __LINE__) static void key_delsav (struct secasvar *); static struct secashead *key_getsah (struct secasindex *); static struct secasvar *key_checkspidup (struct secasindex *, u_int32_t); static struct secasvar *key_getsavbyspi (struct secashead *, u_int32_t); static int key_setsaval (struct secasvar *, struct mbuf *, const struct sadb_msghdr *); static int key_mature (struct secasvar *); static struct mbuf *key_setdumpsa (struct secasvar *, u_int8_t, u_int8_t, u_int32_t, u_int32_t); #ifdef IPSEC_NAT_T static struct mbuf *key_setsadbxport (u_int16_t, u_int16_t); static struct mbuf *key_setsadbxtype (u_int16_t); #endif static void key_porttosaddr (union sockaddr_union *, u_int16_t); static int key_checksalen (const union sockaddr_union *); static struct mbuf *key_setsadbmsg (u_int8_t, u_int16_t, u_int8_t, u_int32_t, pid_t, u_int16_t); static struct mbuf *key_setsadbsa (struct secasvar *); static struct mbuf *key_setsadbaddr (u_int16_t, const struct sockaddr *, u_int8_t, u_int16_t); #if 0 static struct mbuf *key_setsadbident (u_int16_t, u_int16_t, void *, int, u_int64_t); #endif static struct mbuf *key_setsadbxsa2 (u_int8_t, u_int32_t, u_int16_t); static struct mbuf *key_setsadbxpolicy (u_int16_t, u_int8_t, u_int32_t); static void *key_newbuf (const void *, u_int); #ifdef INET6 static int key_ismyaddr6 (struct sockaddr_in6 *); #endif /* flags for key_cmpsaidx() */ #define CMP_HEAD 1 /* protocol, addresses. */ #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ #define CMP_REQID 3 /* additionally HEAD, reaid. */ #define CMP_EXACTLY 4 /* all elements. */ static int key_cmpsaidx (const struct secasindex *, const struct secasindex *, int); static int key_sockaddrcmp (const struct sockaddr *, const struct sockaddr *, int); static int key_bbcmp (const void *, const void *, u_int); static void key_srandom (void); static u_int16_t key_satype2proto (u_int8_t); static u_int8_t key_proto2satype (u_int16_t); static int key_getspi (struct socket *, struct mbuf *, const struct sadb_msghdr *); static u_int32_t key_do_getnewspi (struct sadb_spirange *, struct secasindex *); #ifdef IPSEC_NAT_T static int key_handle_natt_info (struct secasvar *, const struct sadb_msghdr *); #endif static int key_update (struct socket *, struct mbuf *, const struct sadb_msghdr *); #ifdef IPSEC_DOSEQCHECK static struct secasvar *key_getsavbyseq (struct secashead *, u_int32_t); #endif static int key_add (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_setident (struct secashead *, struct mbuf *, const struct sadb_msghdr *); static struct mbuf *key_getmsgbuf_x1 (struct mbuf *, const struct sadb_msghdr *); static int key_delete (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_get (struct socket *, struct mbuf *, const struct sadb_msghdr *); static void key_getcomb_setlifetime (struct sadb_comb *); static struct mbuf *key_getcomb_esp (void); static struct mbuf *key_getcomb_ah (void); static struct mbuf *key_getcomb_ipcomp (void); static struct mbuf *key_getprop (const struct secasindex *); static int key_acquire (const struct secasindex *, struct secpolicy *); #ifndef IPSEC_NONBLOCK_ACQUIRE static struct secacq *key_newacq (const struct secasindex *); static struct secacq *key_getacq (const struct secasindex *); static struct secacq *key_getacqbyseq (u_int32_t); #endif static struct secspacq *key_newspacq (struct secpolicyindex *); static struct secspacq *key_getspacq (struct secpolicyindex *); static int key_acquire2 (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_register (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_expire (struct secasvar *); static int key_flush (struct socket *, struct mbuf *, const struct sadb_msghdr *); static struct mbuf *key_setdump_chain (u_int8_t req_satype, int *errorp, int *lenp, pid_t pid); static int key_dump (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_promisc (struct socket *, struct mbuf *, const struct sadb_msghdr *); static int key_senderror (struct socket *, struct mbuf *, int); static int key_validate_ext (const struct sadb_ext *, int); static int key_align (struct mbuf *, struct sadb_msghdr *); #if 0 static const char *key_getfqdn (void); static const char *key_getuserfqdn (void); #endif static void key_sa_chgstate (struct secasvar *, u_int8_t); static inline void key_sp_dead (struct secpolicy *); static void key_sp_unlink (struct secpolicy *sp); static struct mbuf *key_alloc_mbuf (int); struct callout key_timehandler_ch; #define SA_ADDREF(p) do { \ (p)->refcnt++; \ IPSEC_ASSERT((p)->refcnt != 0, \ ("SA refcnt overflow at %s:%u", __FILE__, __LINE__)); \ } while (0) #define SA_DELREF(p) do { \ IPSEC_ASSERT((p)->refcnt > 0, \ ("SA refcnt underflow at %s:%u", __FILE__, __LINE__)); \ (p)->refcnt--; \ } while (0) #define SP_ADDREF(p) do { \ (p)->refcnt++; \ IPSEC_ASSERT((p)->refcnt != 0, \ ("SP refcnt overflow at %s:%u", __FILE__, __LINE__)); \ } while (0) #define SP_DELREF(p) do { \ IPSEC_ASSERT((p)->refcnt > 0, \ ("SP refcnt underflow at %s:%u", __FILE__, __LINE__)); \ (p)->refcnt--; \ } while (0) static inline void key_sp_dead(struct secpolicy *sp) { /* mark the SP dead */ sp->state = IPSEC_SPSTATE_DEAD; } static void key_sp_unlink(struct secpolicy *sp) { /* remove from SP index */ if (__LIST_CHAINED(sp)) { LIST_REMOVE(sp, chain); /* Release refcount held just for being on chain */ KEY_FREESP(&sp); } } /* * Return 0 when there are known to be no SP's for the specified * direction. Otherwise return 1. This is used by IPsec code * to optimize performance. */ int key_havesp(u_int dir) { return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? LIST_FIRST(&sptree[dir]) != NULL : 1); } /* %%% 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(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) { struct secpolicy *sp; int s; IPSEC_ASSERT(spidx != NULL, ("key_allocsp: null spidx")); IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, ("key_allocsp: invalid direction %u", dir)); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsp from %s:%u\n", where, tag)); /* get a SP entry */ s = splsoftnet(); /*called from softclock()*/ KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("*** objects\n"); kdebug_secpolicyindex(spidx)); LIST_FOREACH(sp, &sptree[dir], chain) { KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("*** in SPD\n"); kdebug_secpolicyindex(&sp->spidx)); if (sp->state == IPSEC_SPSTATE_DEAD) continue; if (key_cmpspidx_withmask(&sp->spidx, spidx)) goto found; } sp = NULL; found: if (sp) { /* sanity check */ KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp"); /* found a SPD entry */ sp->lastused = time_second; SP_ADDREF(sp); } splx(s); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsp return SP:%p (ID=%u) refcnt %u\n", sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); return sp; } /* * 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_allocsp2(u_int32_t spi, union sockaddr_union *dst, u_int8_t proto, u_int dir, const char* where, int tag) { struct secpolicy *sp; int s; IPSEC_ASSERT(dst != NULL, ("key_allocsp2: null dst")); IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, ("key_allocsp2: invalid direction %u", dir)); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsp2 from %s:%u\n", where, tag)); /* get a SP entry */ s = splsoftnet(); /*called from softclock()*/ KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("*** objects\n"); printf("spi %u proto %u dir %u\n", spi, proto, dir); kdebug_sockaddr(&dst->sa)); LIST_FOREACH(sp, &sptree[dir], chain) { KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("*** in SPD\n"); kdebug_secpolicyindex(&sp->spidx)); if (sp->state == IPSEC_SPSTATE_DEAD) continue; /* compare simple values, then dst address */ if (sp->spidx.ul_proto != proto) continue; /* NB: spi's must exist and match */ if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) continue; if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) goto found; } sp = NULL; found: if (sp) { /* sanity check */ KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp2"); /* found a SPD entry */ sp->lastused = time_second; SP_ADDREF(sp); } splx(s); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsp2 return SP:%p (ID=%u) refcnt %u\n", sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); return sp; } /* * return a policy that matches this particular inbound packet. * XXX slow */ struct secpolicy * key_gettunnel(const struct sockaddr *osrc, const struct sockaddr *odst, const struct sockaddr *isrc, const struct sockaddr *idst, const char* where, int tag) { struct secpolicy *sp; const int dir = IPSEC_DIR_INBOUND; int s; struct ipsecrequest *r1, *r2, *p; struct secpolicyindex spidx; KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_gettunnel from %s:%u\n", where, tag)); if (isrc->sa_family != idst->sa_family) { ipseclog((LOG_ERR, "protocol family mismatched %d != %d\n.", isrc->sa_family, idst->sa_family)); sp = NULL; goto done; } s = splsoftnet(); /*called from softclock()*/ LIST_FOREACH(sp, &sptree[dir], chain) { if (sp->state == IPSEC_SPSTATE_DEAD) continue; r1 = r2 = NULL; for (p = sp->req; p; p = p->next) { if (p->saidx.mode != IPSEC_MODE_TUNNEL) continue; r1 = r2; r2 = p; if (!r1) { /* here we look at address matches only */ spidx = sp->spidx; if (isrc->sa_len > sizeof(spidx.src) || idst->sa_len > sizeof(spidx.dst)) continue; memcpy(&spidx.src, isrc, isrc->sa_len); memcpy(&spidx.dst, idst, idst->sa_len); if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) continue; } else { if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) continue; } if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) continue; goto found; } } sp = NULL; found: if (sp) { sp->lastused = time_second; SP_ADDREF(sp); } splx(s); done: KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_gettunnel return SP:%p (ID=%u) refcnt %u\n", sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 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(struct ipsecrequest *isr, const struct secasindex *saidx) { u_int level; int error; IPSEC_ASSERT(isr != NULL, ("key_checkrequest: null isr")); IPSEC_ASSERT(saidx != NULL, ("key_checkrequest: null saidx")); IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || saidx->mode == IPSEC_MODE_TUNNEL, ("key_checkrequest: unexpected policy %u", saidx->mode)); /* get current level */ level = ipsec_get_reqlevel(isr); /* * XXX guard against protocol callbacks from the crypto * thread as they reference ipsecrequest.sav which we * temporarily null out below. Need to rethink how we * handle bundled SA's in the callback thread. */ IPSEC_SPLASSERT_SOFTNET("key_checkrequest"); #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 == (struct secasvar *)LIST_FIRST( &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 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) { if (isr->sav->state != SADB_SASTATE_MATURE && isr->sav->state != SADB_SASTATE_DYING) return EINVAL; return 0; } /* there is no SA */ error = key_acquire(saidx, isr->sp); if (error != 0) { /* XXX What should I do ? */ ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned " "from key_acquire.\n", error)); return error; } if (level != IPSEC_LEVEL_REQUIRE) { /* XXX sigh, the interface to this routine is botched */ IPSEC_ASSERT(isr->sav == NULL, ("key_checkrequest: unexpected SA")); return 0; } else { return ENOENT; } } /* * 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(const 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(&sah->saidx, saidx, CMP_MODE_REQID)) 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(struct secashead *sah, u_int state) { struct secasvar *sav, *nextsav, *candidate, *d; /* initilize */ candidate = NULL; for (sav = LIST_FIRST(&sah->savtree[state]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, 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"); /* What the best method is to compare ? */ if (key_prefered_oldsa) { if (candidate->lft_c->sadb_lifetime_addtime > sav->lft_c->sadb_lifetime_addtime) { candidate = sav; } continue; /*NOTREACHED*/ } /* prefered new sa rather than old sa */ if (candidate->lft_c->sadb_lifetime_addtime < sav->lft_c->sadb_lifetime_addtime) { d = candidate; candidate = sav; } else d = sav; /* * prepared to delete the SA when there is more * suitable candidate and the lifetime of the SA is not * permanent. */ if (d->lft_c->sadb_lifetime_addtime != 0) { struct mbuf *m, *result; uint8_t satype; key_sa_chgstate(d, SADB_SASTATE_DEAD); IPSEC_ASSERT(d->refcnt > 0, ("key_do_allocsa_policy: bogus ref count")); satype = key_proto2satype(d->sah->saidx.proto); if (satype == 0) goto msgfail; m = key_setsadbmsg(SADB_DELETE, 0, satype, 0, 0, d->refcnt - 1); if (!m) goto msgfail; result = m; /* set sadb_address for saidx's. */ m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &d->sah->saidx.src.sa, d->sah->saidx.src.sa.sa_len << 3, IPSEC_ULPROTO_ANY); if (!m) goto msgfail; m_cat(result, m); /* set sadb_address for saidx's. */ m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &d->sah->saidx.src.sa, d->sah->saidx.src.sa.sa_len << 3, IPSEC_ULPROTO_ANY); if (!m) goto msgfail; m_cat(result, m); /* create SA extension */ m = key_setsadbsa(d); if (!m) goto msgfail; m_cat(result, m); if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) goto msgfail; } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); if (key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED)) goto msgfail; msgfail: KEY_FREESAV(&d); } } if (candidate) { SA_ADDREF(candidate); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP allocsa_policy cause " "refcnt++:%d SA:%p\n", candidate->refcnt, candidate)); } return candidate; } /* * allocating a usable SA entry for a *INBOUND* packet. * Must call key_freesav() later. * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). * NULL: not found, or error occurred. * * In the comparison, no source address is used--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. * * sport and dport are used for NAT-T. network order is always used. */ struct secasvar * key_allocsa( const union sockaddr_union *dst, u_int proto, u_int32_t spi, u_int16_t sport, u_int16_t dport, const char* where, int tag) { struct secashead *sah; struct secasvar *sav; u_int stateidx, state; int s; int chkport = 0; int must_check_spi = 1; int must_check_alg = 0; u_int16_t cpi = 0; u_int8_t algo = 0; #ifdef IPSEC_NAT_T if ((sport != 0) && (dport != 0)) chkport = 1; #endif IPSEC_ASSERT(dst != NULL, ("key_allocsa: null dst address")); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsa from %s:%u\n", where, tag)); /* * XXX IPCOMP case * We use cpi to define spi here. In the case where cpi <= * IPCOMP_CPI_NEGOTIATE_MIN, cpi just define the algorithm used, not * the real spi. In this case, don't check the spi but check the * algorithm */ if (proto == IPPROTO_IPCOMP) { u_int32_t tmp; tmp = ntohl(spi); cpi = (u_int16_t) tmp; if (cpi < IPCOMP_CPI_NEGOTIATE_MIN) { algo = (u_int8_t) cpi; must_check_spi = 0; must_check_alg = 1; } } /* * 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()*/ LIST_FOREACH(sah, &sahtree, chain) { /* search valid state */ for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_valid); stateidx++) { state = saorder_state_valid[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { /* sanity check */ KEY_CHKSASTATE(sav->state, state, "key_allocsav"); /* do not return entries w/ unusable state */ if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) continue; if (proto != sav->sah->saidx.proto) continue; if (must_check_spi && spi != sav->spi) continue; /* XXX only on the ipcomp case */ if (must_check_alg && algo != sav->alg_comp) continue; #if 0 /* don't check src */ /* Fix port in src->sa */ /* check src address */ if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) continue; #endif /* fix port of dst address XXX*/ key_porttosaddr(__UNCONST(dst), dport); /* check dst address */ if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, chkport) != 0) continue; SA_ADDREF(sav); goto done; } } } sav = NULL; done: splx(s); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_allocsa return SA:%p; refcnt %u\n", sav, sav ? sav->refcnt : 0)); return sav; } /* * Must be called after calling key_allocsp(). * For both the packet without socket and key_freeso(). */ void _key_freesp(struct secpolicy **spp, const char* where, int tag) { struct secpolicy *sp = *spp; IPSEC_ASSERT(sp != NULL, ("key_freesp: null sp")); SP_DELREF(sp); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_freesp SP:%p (ID=%u) from %s:%u; refcnt now %u\n", sp, sp->id, where, tag, sp->refcnt)); if (sp->refcnt == 0) { *spp = NULL; key_delsp(sp); } } /* * Must be called after calling key_allocsp(). * For the packet with socket. */ void key_freeso(struct socket *so) { /* sanity check */ IPSEC_ASSERT(so != NULL, ("key_freeso: null so")); switch (so->so_proto->pr_domain->dom_family) { #ifdef INET case PF_INET: { struct inpcb *pcb = sotoinpcb(so); /* Does it have a PCB ? */ if (pcb == NULL) return; key_freesp_so(&pcb->inp_sp->sp_in); key_freesp_so(&pcb->inp_sp->sp_out); } break; #endif #ifdef INET6 case PF_INET6: { #ifdef HAVE_NRL_INPCB struct inpcb *pcb = sotoinpcb(so); /* Does it have a PCB ? */ if (pcb == NULL) return; key_freesp_so(&pcb->inp_sp->sp_in); key_freesp_so(&pcb->inp_sp->sp_out); #else struct in6pcb *pcb = sotoin6pcb(so); /* Does it have a PCB ? */ if (pcb == NULL) return; key_freesp_so(&pcb->in6p_sp->sp_in); key_freesp_so(&pcb->in6p_sp->sp_out); #endif } break; #endif /* INET6 */ default: ipseclog((LOG_DEBUG, "key_freeso: unknown address family=%d.\n", so->so_proto->pr_domain->dom_family)); return; } } static void key_freesp_so(struct secpolicy **sp) { IPSEC_ASSERT(sp != NULL && *sp != NULL, ("key_freesp_so: null sp")); if ((*sp)->policy == IPSEC_POLICY_ENTRUST || (*sp)->policy == IPSEC_POLICY_BYPASS) return; IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, ("key_freesp_so: invalid policy %u", (*sp)->policy)); KEY_FREESP(sp); } /* * 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(struct secasvar **psav, const char* where, int tag) { struct secasvar *sav = *psav; IPSEC_ASSERT(sav != NULL, ("key_freesav: null sav")); SA_DELREF(sav); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_freesav SA:%p (SPI %lu) from %s:%u; refcnt now %u\n", sav, (u_long)ntohl(sav->spi), where, tag, sav->refcnt)); if (sav->refcnt == 0) { *psav = NULL; key_delsav(sav); } } /* %%% SPD management */ /* * free security policy entry. */ static void key_delsp(struct secpolicy *sp) { int s; IPSEC_ASSERT(sp != NULL, ("key_delsp: null sp")); key_sp_dead(sp); IPSEC_ASSERT(sp->refcnt == 0, ("key_delsp: SP with references deleted (refcnt %u)", sp->refcnt)); s = splsoftnet(); /*called from softclock()*/ { struct ipsecrequest *isr = sp->req, *nextisr; while (isr != NULL) { if (isr->sav != NULL) { KEY_FREESAV(&isr->sav); isr->sav = NULL; } nextisr = isr->next; KFREE(isr); isr = nextisr; } } KFREE(sp); splx(s); } /* * search SPD * OUT: NULL : not found * others : found, pointer to a SP. */ static struct secpolicy * key_getsp(struct secpolicyindex *spidx) { struct secpolicy *sp; IPSEC_ASSERT(spidx != NULL, ("key_getsp: null spidx")); LIST_FOREACH(sp, &sptree[spidx->dir], chain) { if (sp->state == IPSEC_SPSTATE_DEAD) continue; if (key_cmpspidx_exactly(spidx, &sp->spidx)) { SP_ADDREF(sp); return sp; } } return NULL; } /* * get SP by index. * OUT: NULL : not found * others : found, pointer to a SP. */ static struct secpolicy * key_getspbyid(u_int32_t id) { struct secpolicy *sp; LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) { if (sp->state == IPSEC_SPSTATE_DEAD) continue; if (sp->id == id) { SP_ADDREF(sp); return sp; } } LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) { if (sp->state == IPSEC_SPSTATE_DEAD) continue; if (sp->id == id) { SP_ADDREF(sp); return sp; } } return NULL; } struct secpolicy * key_newsp(const char* where, int tag) { struct secpolicy *newsp = NULL; newsp = (struct secpolicy *) malloc(sizeof(struct secpolicy), M_SECA, M_NOWAIT|M_ZERO); if (newsp) { newsp->refcnt = 1; newsp->req = NULL; } KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_newsp from %s:%u return SP:%p\n", where, tag, newsp)); return newsp; } /* * create secpolicy structure from sadb_x_policy structure. * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, * so must be set properly later. */ struct secpolicy * key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error) { struct secpolicy *newsp; /* sanity check */ if (xpl0 == NULL) panic("key_msg2sp: NULL pointer was passed"); if (len < sizeof(*xpl0)) panic("key_msg2sp: invalid length"); if (len != PFKEY_EXTLEN(xpl0)) { ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n")); *error = EINVAL; return NULL; } if ((newsp = KEY_NEWSP()) == NULL) { *error = ENOBUFS; return NULL; } newsp->spidx.dir = xpl0->sadb_x_policy_dir; newsp->policy = xpl0->sadb_x_policy_type; /* check policy */ switch (xpl0->sadb_x_policy_type) { case IPSEC_POLICY_DISCARD: case IPSEC_POLICY_NONE: case IPSEC_POLICY_ENTRUST: case IPSEC_POLICY_BYPASS: newsp->req = NULL; break; case IPSEC_POLICY_IPSEC: { int tlen; struct sadb_x_ipsecrequest *xisr; struct ipsecrequest **p_isr = &newsp->req; /* validity check */ if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); while (tlen > 0) { /* length check */ if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { ipseclog((LOG_DEBUG, "key_msg2sp: " "invalid ipsecrequest length.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } /* allocate request buffer */ KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr)); if ((*p_isr) == NULL) { ipseclog((LOG_DEBUG, "key_msg2sp: No more memory.\n")); KEY_FREESP(&newsp); *error = ENOBUFS; return NULL; } memset(*p_isr, 0, sizeof(**p_isr)); /* set values */ (*p_isr)->next = NULL; switch (xisr->sadb_x_ipsecrequest_proto) { case IPPROTO_ESP: case IPPROTO_AH: case IPPROTO_IPCOMP: break; default: ipseclog((LOG_DEBUG, "key_msg2sp: invalid proto type=%u\n", xisr->sadb_x_ipsecrequest_proto)); KEY_FREESP(&newsp); *error = EPROTONOSUPPORT; return NULL; } (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; switch (xisr->sadb_x_ipsecrequest_mode) { case IPSEC_MODE_TRANSPORT: case IPSEC_MODE_TUNNEL: break; case IPSEC_MODE_ANY: default: ipseclog((LOG_DEBUG, "key_msg2sp: invalid mode=%u\n", xisr->sadb_x_ipsecrequest_mode)); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; switch (xisr->sadb_x_ipsecrequest_level) { case IPSEC_LEVEL_DEFAULT: case IPSEC_LEVEL_USE: case IPSEC_LEVEL_REQUIRE: break; case IPSEC_LEVEL_UNIQUE: /* validity check */ /* * If range violation of reqid, kernel will * update it, don't refuse it. */ if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX) { ipseclog((LOG_DEBUG, "key_msg2sp: reqid=%d range " "violation, updated by kernel.\n", xisr->sadb_x_ipsecrequest_reqid)); xisr->sadb_x_ipsecrequest_reqid = 0; } /* allocate new reqid id if reqid is zero. */ if (xisr->sadb_x_ipsecrequest_reqid == 0) { u_int16_t reqid; if ((reqid = key_newreqid()) == 0) { KEY_FREESP(&newsp); *error = ENOBUFS; return NULL; } (*p_isr)->saidx.reqid = reqid; xisr->sadb_x_ipsecrequest_reqid = reqid; } else { /* set it for manual keying. */ (*p_isr)->saidx.reqid = xisr->sadb_x_ipsecrequest_reqid; } break; default: ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n", xisr->sadb_x_ipsecrequest_level)); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; /* set IP addresses if there */ if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { struct sockaddr *paddr; paddr = (struct sockaddr *)(xisr + 1); /* validity check */ if (paddr->sa_len > sizeof((*p_isr)->saidx.src)) { ipseclog((LOG_DEBUG, "key_msg2sp: invalid request " "address length.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } memcpy(&(*p_isr)->saidx.src, paddr, paddr->sa_len); paddr = (struct sockaddr *)((char *)paddr + paddr->sa_len); /* validity check */ if (paddr->sa_len > sizeof((*p_isr)->saidx.dst)) { ipseclog((LOG_DEBUG, "key_msg2sp: invalid request " "address length.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } memcpy(&(*p_isr)->saidx.dst, paddr, paddr->sa_len); } (*p_isr)->sav = NULL; (*p_isr)->sp = newsp; /* initialization for the next. */ p_isr = &(*p_isr)->next; tlen -= xisr->sadb_x_ipsecrequest_len; /* validity check */ if (tlen < 0) { ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } xisr = (struct sadb_x_ipsecrequest *)((char *)xisr + xisr->sadb_x_ipsecrequest_len); } } break; default: ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n")); KEY_FREESP(&newsp); *error = EINVAL; return NULL; } *error = 0; return newsp; } static u_int16_t key_newreqid(void) { static u_int16_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; auto_reqid = (auto_reqid == 0xffff ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); /* XXX should be unique check */ return auto_reqid; } /* * copy secpolicy struct to sadb_x_policy structure indicated. */ struct mbuf * key_sp2msg(struct secpolicy *sp) { struct sadb_x_policy *xpl; int tlen; char *p; struct mbuf *m; /* sanity check. */ if (sp == NULL) panic("key_sp2msg: NULL pointer was passed"); tlen = key_getspreqmsglen(sp); m = key_alloc_mbuf(tlen); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } m->m_len = tlen; m->m_next = NULL; xpl = mtod(m, struct sadb_x_policy *); memset(xpl, 0, tlen); xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; xpl->sadb_x_policy_type = sp->policy; xpl->sadb_x_policy_dir = sp->spidx.dir; xpl->sadb_x_policy_id = sp->id; p = (char *)xpl + sizeof(*xpl); /* if is the policy for ipsec ? */ if (sp->policy == IPSEC_POLICY_IPSEC) { struct sadb_x_ipsecrequest *xisr; struct ipsecrequest *isr; for (isr = sp->req; isr != NULL; isr = isr->next) { xisr = (struct sadb_x_ipsecrequest *)p; xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; xisr->sadb_x_ipsecrequest_level = isr->level; xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; p += sizeof(*xisr); memcpy(p, &isr->saidx.src, isr->saidx.src.sa.sa_len); p += isr->saidx.src.sa.sa_len; memcpy(p, &isr->saidx.dst, isr->saidx.dst.sa.sa_len); p += isr->saidx.src.sa.sa_len; xisr->sadb_x_ipsecrequest_len = PFKEY_ALIGN8(sizeof(*xisr) + isr->saidx.src.sa.sa_len + isr->saidx.dst.sa.sa_len); } } return m; } /* m will not be freed nor modified */ static struct mbuf * key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, int ndeep, int nitem, ...) { va_list ap; int idx; int i; struct mbuf *result = NULL, *n; int len; if (m == NULL || mhp == NULL) panic("null pointer passed to key_gather"); va_start(ap, nitem); for (i = 0; i < nitem; i++) { idx = va_arg(ap, int); if (idx < 0 || idx > SADB_EXT_MAX) goto fail; /* don't attempt to pull empty extension */ if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) continue; if (idx != SADB_EXT_RESERVED && (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) continue; if (idx == SADB_EXT_RESERVED) { len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); #ifdef DIAGNOSTIC if (len > MHLEN) panic("assumption failed"); #endif MGETHDR(n, M_DONTWAIT, MT_DATA); if (!n) goto fail; n->m_len = len; n->m_next = NULL; m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, void *)); } else if (i < ndeep) { len = mhp->extlen[idx]; n = key_alloc_mbuf(len); if (!n || n->m_next) { /*XXX*/ if (n) m_freem(n); goto fail; } m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], mtod(n, void *)); } else { n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], M_DONTWAIT); } if (n == NULL) goto fail; if (result) m_cat(result, n); else result = n; } va_end(ap); if ((result->m_flags & M_PKTHDR) != 0) { result->m_pkthdr.len = 0; for (n = result; n; n = n->m_next) result->m_pkthdr.len += n->m_len; } return result; fail: va_end(ap); m_freem(result); return NULL; } /* * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing * add an entry to SP database, when received * * from the user(?). * Adding to SP database, * and send * * to the socket which was send. * * SPDADD set a unique policy entry. * SPDSETIDX like SPDADD without a part of policy requests. * SPDUPDATE replace a unique policy entry. * * m will always be freed. */ static int key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_address *src0, *dst0; struct sadb_x_policy *xpl0, *xpl; struct sadb_lifetime *lft = NULL; struct secpolicyindex spidx; struct secpolicy *newsp; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spdadd: NULL pointer is passed"); if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || mhp->ext[SADB_X_EXT_POLICY] == NULL) { ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(struct sadb_lifetime)) { ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; } src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; /* make secindex */ /* XXX boundary check against sa_len */ KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, src0 + 1, dst0 + 1, src0->sadb_address_prefixlen, dst0->sadb_address_prefixlen, src0->sadb_address_proto, &spidx); /* checking the direciton. */ switch (xpl0->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: case IPSEC_DIR_OUTBOUND: break; default: ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n")); mhp->msg->sadb_msg_errno = EINVAL; return 0; } /* check policy */ /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n")); return key_senderror(so, m, EINVAL); } /* policy requests are mandatory when action is ipsec. */ if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part required.\n")); return key_senderror(so, m, EINVAL); } /* * checking there is SP already or not. * SPDUPDATE doesn't depend on whether there is a SP or not. * If the type is either SPDADD or SPDSETIDX AND a SP is found, * then error. */ newsp = key_getsp(&spidx); if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { if (newsp) { key_sp_dead(newsp); key_sp_unlink(newsp); /* XXX jrs ordering */ KEY_FREESP(&newsp); newsp = NULL; } } else { if (newsp != NULL) { KEY_FREESP(&newsp); ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists already.\n")); return key_senderror(so, m, EEXIST); } } /* allocation new SP entry */ if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { return key_senderror(so, m, error); } if ((newsp->id = key_getnewspid()) == 0) { KFREE(newsp); return key_senderror(so, m, ENOBUFS); } /* XXX boundary check against sa_len */ KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, src0 + 1, dst0 + 1, src0->sadb_address_prefixlen, dst0->sadb_address_prefixlen, src0->sadb_address_proto, &newsp->spidx); /* sanity check on addr pair */ if (((struct sockaddr *)(src0 + 1))->sa_family != ((struct sockaddr *)(dst0+ 1))->sa_family) { KFREE(newsp); return key_senderror(so, m, EINVAL); } if (((struct sockaddr *)(src0 + 1))->sa_len != ((struct sockaddr *)(dst0+ 1))->sa_len) { KFREE(newsp); return key_senderror(so, m, EINVAL); } #if 1 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { struct sockaddr *sa; sa = (struct sockaddr *)(src0 + 1); if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { KFREE(newsp); return key_senderror(so, m, EINVAL); } } if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { struct sockaddr *sa; sa = (struct sockaddr *)(dst0 + 1); if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { KFREE(newsp); return key_senderror(so, m, EINVAL); } } #endif newsp->created = time_second; newsp->lastused = newsp->created; newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; newsp->refcnt = 1; /* do not reclaim until I say I do */ newsp->state = IPSEC_SPSTATE_ALIVE; LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain); /* delete the entry in spacqtree */ if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { struct secspacq *spacq; if ((spacq = key_getspacq(&spidx)) != NULL) { /* reset counter in order to deletion by timehandler. */ spacq->created = time_second; spacq->count = 0; } } #if defined(__NetBSD__) /* Invalidate all cached SPD pointers in the PCBs. */ ipsec_invalpcbcacheall(); #if defined(GATEWAY) /* Invalidate the ipflow cache, as well. */ ipflow_invalidate_all(0); #ifdef INET6 ip6flow_invalidate_all(0); #endif /* INET6 */ #endif /* GATEWAY */ #endif /* __NetBSD__ */ { struct mbuf *n, *mpolicy; struct sadb_msg *newmsg; int off; /* create new sadb_msg to reply. */ if (lft) { n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); } else { n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); } if (!n) return key_senderror(so, m, ENOBUFS); if (n->m_len < sizeof(*newmsg)) { n = m_pullup(n, sizeof(*newmsg)); if (!n) return key_senderror(so, m, ENOBUFS); } newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); off = 0; mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), sizeof(*xpl), &off); if (mpolicy == NULL) { /* n is already freed */ return key_senderror(so, m, ENOBUFS); } xpl = (struct sadb_x_policy *)(mtod(mpolicy, char *) + off); if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { m_freem(n); return key_senderror(so, m, EINVAL); } xpl->sadb_x_policy_id = newsp->id; m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * get new policy id. * OUT: * 0: failure. * others: success. */ static u_int32_t key_getnewspid(void) { u_int32_t newid = 0; int count = key_spi_trycnt; /* XXX */ struct secpolicy *sp; /* when requesting to allocate spi ranged */ while (count--) { newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1)); if ((sp = key_getspbyid(newid)) == NULL) break; KEY_FREESP(&sp); } if (count == 0 || newid == 0) { ipseclog((LOG_DEBUG, "key_getnewspid: to allocate policy id is failed.\n")); return 0; } return newid; } /* * SADB_SPDDELETE processing * receive * * from the user(?), and set SADB_SASTATE_DEAD, * and send, * * to the ikmpd. * policy(*) including direction of policy. * * m will always be freed. */ static int key_spddelete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_address *src0, *dst0; struct sadb_x_policy *xpl0; struct secpolicyindex spidx; struct secpolicy *sp; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spddelete: NULL pointer is passed"); if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || mhp->ext[SADB_X_EXT_POLICY] == NULL) { ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; /* make secindex */ /* XXX boundary check against sa_len */ KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, src0 + 1, dst0 + 1, src0->sadb_address_prefixlen, dst0->sadb_address_prefixlen, src0->sadb_address_proto, &spidx); /* checking the direciton. */ switch (xpl0->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: case IPSEC_DIR_OUTBOUND: break; default: ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n")); return key_senderror(so, m, EINVAL); } /* Is there SP in SPD ? */ if ((sp = key_getsp(&spidx)) == NULL) { ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n")); return key_senderror(so, m, EINVAL); } /* save policy id to buffer to be returned. */ xpl0->sadb_x_policy_id = sp->id; key_sp_dead(sp); key_sp_unlink(sp); /* XXX jrs ordering */ KEY_FREESP(&sp); /* ref gained by key_getspbyid */ #if defined(__NetBSD__) /* Invalidate all cached SPD pointers in the PCBs. */ ipsec_invalpcbcacheall(); /* We're deleting policy; no need to invalidate the ipflow cache. */ #endif /* __NetBSD__ */ { struct mbuf *n; struct sadb_msg *newmsg; /* create new sadb_msg to reply. */ n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); if (!n) return key_senderror(so, m, ENOBUFS); newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * SADB_SPDDELETE2 processing * receive * * from the user(?), and set SADB_SASTATE_DEAD, * and send, * * to the ikmpd. * policy(*) including direction of policy. * * m will always be freed. */ static int key_spddelete2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { u_int32_t id; struct secpolicy *sp; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spddelete2: NULL pointer is passed"); if (mhp->ext[SADB_X_EXT_POLICY] == NULL || mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is passed.\n")); key_senderror(so, m, EINVAL); return 0; } id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; /* Is there SP in SPD ? */ if ((sp = key_getspbyid(id)) == NULL) { ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n", id)); return key_senderror(so, m, EINVAL); } key_sp_dead(sp); key_sp_unlink(sp); /* XXX jrs ordering */ KEY_FREESP(&sp); /* ref gained by key_getsp */ sp = NULL; #if defined(__NetBSD__) /* Invalidate all cached SPD pointers in the PCBs. */ ipsec_invalpcbcacheall(); /* We're deleting policy; no need to invalidate the ipflow cache. */ #endif /* __NetBSD__ */ { struct mbuf *n, *nn; struct sadb_msg *newmsg; int off, len; /* create new sadb_msg to reply. */ len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); if (len > MCLBYTES) return key_senderror(so, m, ENOBUFS); MGETHDR(n, M_DONTWAIT, MT_DATA); if (n && len > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_freem(n); n = NULL; } } if (!n) return key_senderror(so, m, ENOBUFS); n->m_len = len; n->m_next = NULL; off = 0; m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); #ifdef DIAGNOSTIC if (off != len) panic("length inconsistency in key_spddelete2"); #endif n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); if (!n->m_next) { m_freem(n); return key_senderror(so, m, ENOBUFS); } n->m_pkthdr.len = 0; for (nn = n; nn; nn = nn->m_next) n->m_pkthdr.len += nn->m_len; newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * SADB_X_GET processing * receive * * from the user(?), * and send, * * to the ikmpd. * policy(*) including direction of policy. * * m will always be freed. */ static int key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { u_int32_t id; struct secpolicy *sp; struct mbuf *n; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spdget: NULL pointer is passed"); if (mhp->ext[SADB_X_EXT_POLICY] == NULL || mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; /* Is there SP in SPD ? */ if ((sp = key_getspbyid(id)) == NULL) { ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id)); return key_senderror(so, m, ENOENT); } n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq, mhp->msg->sadb_msg_pid); KEY_FREESP(&sp); /* ref gained by key_getspbyid */ if (n != NULL) { m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); } else return key_senderror(so, m, ENOBUFS); } /* * SADB_X_SPDACQUIRE processing. * Acquire policy and SA(s) for a *OUTBOUND* packet. * send * * to KMD, and expect to receive * with SADB_X_SPDACQUIRE if error occurred, * or * * with SADB_X_SPDUPDATE from KMD by PF_KEY. * policy(*) is without policy requests. * * 0 : succeed * others: error number */ int key_spdacquire(struct secpolicy *sp) { struct mbuf *result = NULL, *m; struct secspacq *newspacq; int error; /* sanity check */ if (sp == NULL) panic("key_spdacquire: NULL pointer is passed"); if (sp->req != NULL) panic("key_spdacquire: called but there is request"); if (sp->policy != IPSEC_POLICY_IPSEC) panic("key_spdacquire: policy mismathed. IPsec is expected"); /* Get an entry to check whether sent message or not. */ if ((newspacq = key_getspacq(&sp->spidx)) != NULL) { if (key_blockacq_count < newspacq->count) { /* reset counter and do send message. */ newspacq->count = 0; } else { /* increment counter and do nothing. */ newspacq->count++; return 0; } } else { /* make new entry for blocking to send SADB_ACQUIRE. */ if ((newspacq = key_newspacq(&sp->spidx)) == NULL) return ENOBUFS; /* add to acqtree */ LIST_INSERT_HEAD(&spacqtree, newspacq, chain); } /* create new sadb_msg to reply. */ m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); if (!m) { error = ENOBUFS; goto fail; } result = m; result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); fail: if (result) m_freem(result); return error; } /* * SADB_SPDFLUSH processing * receive * * from the user, and free all entries in secpctree. * and send, * * to the user. * NOTE: what to do is only marking SADB_SASTATE_DEAD. * * m will always be freed. */ static int key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_msg *newmsg; struct secpolicy *sp; u_int dir; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spdflush: NULL pointer is passed"); if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) return key_senderror(so, m, EINVAL); for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { struct secpolicy * nextsp; for (sp = LIST_FIRST(&sptree[dir]); sp != NULL; sp = nextsp) { nextsp = LIST_NEXT(sp, chain); if (sp->state == IPSEC_SPSTATE_DEAD) continue; key_sp_dead(sp); key_sp_unlink(sp); /* 'sp' dead; continue transfers to 'sp = nextsp' */ continue; } } #if defined(__NetBSD__) /* Invalidate all cached SPD pointers in the PCBs. */ ipsec_invalpcbcacheall(); /* We're deleting policy; no need to invalidate the ipflow cache. */ #endif /* __NetBSD__ */ if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } if (m->m_next) m_freem(m->m_next); m->m_next = NULL; m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); newmsg = mtod(m, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); } static struct sockaddr key_src = { .sa_len = 2, .sa_family = PF_KEY, }; static struct mbuf * key_setspddump_chain(int *errorp, int *lenp, pid_t pid) { struct secpolicy *sp; int cnt; u_int dir; struct mbuf *m, *n, *prev; int totlen; *lenp = 0; /* search SPD entry and get buffer size. */ cnt = 0; for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { LIST_FOREACH(sp, &sptree[dir], chain) { cnt++; } } if (cnt == 0) { *errorp = ENOENT; return (NULL); } m = NULL; prev = m; totlen = 0; for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { LIST_FOREACH(sp, &sptree[dir], chain) { --cnt; n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, pid); if (!n) { *errorp = ENOBUFS; if (m) m_freem(m); return (NULL); } totlen += n->m_pkthdr.len; if (!m) { m = n; } else { prev->m_nextpkt = n; } prev = n; } } *lenp = totlen; *errorp = 0; return (m); } /* * SADB_SPDDUMP processing * receive * * from the user, and dump all SP leaves * and send, * ..... * to the ikmpd. * * m will always be freed. */ static int key_spddump(struct socket *so, struct mbuf *m0, const struct sadb_msghdr *mhp) { struct mbuf *n; int error, len; int ok, s; pid_t pid; /* sanity check */ if (so == NULL || m0 == NULL || mhp == NULL || mhp->msg == NULL) panic("key_spddump: NULL pointer is passed"); pid = mhp->msg->sadb_msg_pid; /* * If the requestor has insufficient socket-buffer space * for the entire chain, nobody gets any response to the DUMP. * XXX For now, only the requestor ever gets anything. * Moreover, if the requestor has any space at all, they receive * the entire chain, otherwise the request is refused with ENOBUFS. */ if (sbspace(&so->so_rcv) <= 0) { return key_senderror(so, m0, ENOBUFS); } s = splsoftnet(); n = key_setspddump_chain(&error, &len, pid); splx(s); if (n == NULL) { return key_senderror(so, m0, ENOENT); } { uint64_t *ps = PFKEY_STAT_GETREF(); ps[PFKEY_STAT_IN_TOTAL]++; ps[PFKEY_STAT_IN_BYTES] += len; PFKEY_STAT_PUTREF(); } /* * PF_KEY DUMP responses are no longer broadcast to all PF_KEY sockets. * The requestor receives either the entire chain, or an * error message with ENOBUFS. */ /* * sbappendchainwith record takes the chain of entries, one * packet-record per SPD entry, prepends the key_src sockaddr * to each packet-record, links the sockaddr mbufs into a new * list of records, then appends the entire resulting * list to the requesting socket. */ ok = sbappendaddrchain(&so->so_rcv, (struct sockaddr *)&key_src, n, SB_PRIO_ONESHOT_OVERFLOW); if (!ok) { PFKEY_STATINC(PFKEY_STAT_IN_NOMEM); m_freem(n); return key_senderror(so, m0, ENOBUFS); } m_freem(m0); return error; } #ifdef IPSEC_NAT_T /* * SADB_X_NAT_T_NEW_MAPPING. Unused by racoon as of 2005/04/23 */ static int key_nat_map(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_x_nat_t_type *type; struct sadb_x_nat_t_port *sport; struct sadb_x_nat_t_port *dport; struct sadb_address *addr; struct sadb_x_nat_t_frag *frag; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_nat_map: NULL pointer is passed."); if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] == NULL || mhp->ext[SADB_X_EXT_NAT_T_SPORT] == NULL || mhp->ext[SADB_X_EXT_NAT_T_DPORT] == NULL) { ipseclog((LOG_DEBUG, "key_nat_map: invalid message.\n")); return key_senderror(so, m, EINVAL); } if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) || (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) || (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) { ipseclog((LOG_DEBUG, "key_nat_map: invalid message.\n")); return key_senderror(so, m, EINVAL); } if ((mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) && (mhp->extlen[SADB_X_EXT_NAT_T_OA] < sizeof(*addr))) { ipseclog((LOG_DEBUG, "key_nat_map: invalid message\n")); return key_senderror(so, m, EINVAL); } if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) && (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) { ipseclog((LOG_DEBUG, "key_nat_map: invalid message\n")); return key_senderror(so, m, EINVAL); } type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE]; sport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT]; dport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT]; addr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OA]; frag = (struct sadb_x_nat_t_frag *) mhp->ext[SADB_X_EXT_NAT_T_FRAG]; printf("sadb_nat_map called\n"); /* * XXX handle that, it should also contain a SA, or anything * that enable to update the SA information. */ return 0; } #endif /* IPSEC_NAT_T */ static struct mbuf * key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, pid_t pid) { struct mbuf *result = NULL, *m; m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); if (!m) goto fail; result = m; m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sp->spidx.src.sa, sp->spidx.prefs, sp->spidx.ul_proto); if (!m) goto fail; m_cat(result, m); m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sp->spidx.dst.sa, sp->spidx.prefd, sp->spidx.ul_proto); if (!m) goto fail; m_cat(result, m); m = key_sp2msg(sp); if (!m) goto fail; m_cat(result, m); if ((result->m_flags & M_PKTHDR) == 0) goto fail; if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) goto fail; } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); return result; fail: m_freem(result); return NULL; } /* * get PFKEY message length for security policy and request. */ static u_int key_getspreqmsglen(struct secpolicy *sp) { u_int tlen; tlen = sizeof(struct sadb_x_policy); /* if is the policy for ipsec ? */ if (sp->policy != IPSEC_POLICY_IPSEC) return tlen; /* get length of ipsec requests */ { struct ipsecrequest *isr; int len; for (isr = sp->req; isr != NULL; isr = isr->next) { len = sizeof(struct sadb_x_ipsecrequest) + isr->saidx.src.sa.sa_len + isr->saidx.dst.sa.sa_len; tlen += PFKEY_ALIGN8(len); } } return tlen; } /* * SADB_SPDEXPIRE processing * send * * to KMD by PF_KEY. * * OUT: 0 : succeed * others : error number */ static int key_spdexpire(struct secpolicy *sp) { int s; struct mbuf *result = NULL, *m; int len; int error = -1; struct sadb_lifetime *lt; /* XXX: Why do we lock ? */ s = splsoftnet(); /*called from softclock()*/ /* sanity check */ if (sp == NULL) panic("key_spdexpire: NULL pointer is passed"); /* set msg header */ m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); if (!m) { error = ENOBUFS; goto fail; } result = m; /* create lifetime extension (current and hard) */ len = PFKEY_ALIGN8(sizeof(*lt)) * 2; m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); error = ENOBUFS; goto fail; } memset(mtod(m, void *), 0, len); lt = mtod(m, struct sadb_lifetime *); lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; lt->sadb_lifetime_allocations = 0; lt->sadb_lifetime_bytes = 0; lt->sadb_lifetime_addtime = sp->created; lt->sadb_lifetime_usetime = sp->lastused; lt = (struct sadb_lifetime *)(mtod(m, char *) + len / 2); lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; lt->sadb_lifetime_allocations = 0; lt->sadb_lifetime_bytes = 0; lt->sadb_lifetime_addtime = sp->lifetime; lt->sadb_lifetime_usetime = sp->validtime; m_cat(result, m); /* set sadb_address for source */ m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sp->spidx.src.sa, sp->spidx.prefs, sp->spidx.ul_proto); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* set sadb_address for destination */ m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sp->spidx.dst.sa, sp->spidx.prefd, sp->spidx.ul_proto); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* set secpolicy */ m = key_sp2msg(sp); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); if ((result->m_flags & M_PKTHDR) == 0) { error = EINVAL; goto fail; } if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) { error = ENOBUFS; goto fail; } } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); fail: if (result) m_freem(result); splx(s); return error; } /* %%% SAD management */ /* * allocating a memory for new SA head, and copy from the values of mhp. * OUT: NULL : failure due to the lack of memory. * others : pointer to new SA head. */ static struct secashead * key_newsah(struct secasindex *saidx) { struct secashead *newsah; IPSEC_ASSERT(saidx != NULL, ("key_newsaidx: null saidx")); newsah = (struct secashead *) malloc(sizeof(struct secashead), M_SECA, M_NOWAIT|M_ZERO); if (newsah != NULL) { int i; for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) LIST_INIT(&newsah->savtree[i]); newsah->saidx = *saidx; /* add to saidxtree */ newsah->state = SADB_SASTATE_MATURE; LIST_INSERT_HEAD(&sahtree, newsah, chain); } return(newsah); } /* * delete SA index and all SA registerd. */ static void key_delsah(struct secashead *sah) { struct secasvar *sav, *nextsav; u_int stateidx, state; int s; int zombie = 0; /* sanity check */ if (sah == NULL) panic("key_delsah: NULL pointer is passed"); s = splsoftnet(); /*called from softclock()*/ /* searching all SA registerd in the secindex. */ for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any); stateidx++) { state = saorder_state_any[stateidx]; for (sav = (struct secasvar *)LIST_FIRST(&sah->savtree[state]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); if (sav->refcnt == 0) { /* sanity check */ KEY_CHKSASTATE(state, sav->state, "key_delsah"); KEY_FREESAV(&sav); } else { /* give up to delete this sa */ zombie++; } } } /* don't delete sah only if there are savs. */ if (zombie) { splx(s); return; } rtcache_free(&sah->sa_route); /* remove from tree of SA index */ if (__LIST_CHAINED(sah)) LIST_REMOVE(sah, chain); KFREE(sah); splx(s); return; } /* * allocating a new SA with LARVAL state. key_add() and key_getspi() call, * and copy the values of mhp into new buffer. * When SAD message type is GETSPI: * to set sequence number from acq_seq++, * to set zero to SPI. * not to call key_setsava(). * OUT: NULL : fail * others : pointer to new secasvar. * * does not modify mbuf. does not free mbuf on error. */ static struct secasvar * key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, struct secashead *sah, int *errp, const char* where, int tag) { struct secasvar *newsav; const struct sadb_sa *xsa; /* sanity check */ if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL) panic("key_newsa: NULL pointer is passed"); KMALLOC(newsav, struct secasvar *, sizeof(struct secasvar)); if (newsav == NULL) { ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n")); *errp = ENOBUFS; goto done; } memset(newsav, 0, sizeof(struct secasvar)); switch (mhp->msg->sadb_msg_type) { case SADB_GETSPI: newsav->spi = 0; #ifdef IPSEC_DOSEQCHECK /* sync sequence number */ if (mhp->msg->sadb_msg_seq == 0) newsav->seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); else #endif newsav->seq = mhp->msg->sadb_msg_seq; break; case SADB_ADD: /* sanity check */ if (mhp->ext[SADB_EXT_SA] == NULL) { KFREE(newsav), newsav = NULL; ipseclog((LOG_DEBUG, "key_newsa: invalid message is passed.\n")); *errp = EINVAL; goto done; } xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; newsav->spi = xsa->sadb_sa_spi; newsav->seq = mhp->msg->sadb_msg_seq; break; default: KFREE(newsav), newsav = NULL; *errp = EINVAL; goto done; } /* copy sav values */ if (mhp->msg->sadb_msg_type != SADB_GETSPI) { *errp = key_setsaval(newsav, m, mhp); if (*errp) { KFREE(newsav), newsav = NULL; goto done; } } /* reset created */ newsav->created = time_second; newsav->pid = mhp->msg->sadb_msg_pid; /* add to satree */ newsav->sah = sah; newsav->refcnt = 1; newsav->state = SADB_SASTATE_LARVAL; LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, secasvar, chain); done: KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_newsav from %s:%u return SP:%p\n", where, tag, newsav)); return newsav; } /* * free() SA variable entry. */ static void key_delsav(struct secasvar *sav) { IPSEC_ASSERT(sav != NULL, ("key_delsav: null sav")); IPSEC_ASSERT(sav->refcnt == 0, ("key_delsav: reference count %u > 0", sav->refcnt)); /* remove from SA header */ if (__LIST_CHAINED(sav)) LIST_REMOVE(sav, chain); /* * Cleanup xform state. Note that zeroize'ing causes the * keys to be cleared; otherwise we must do it ourself. */ if (sav->tdb_xform != NULL) { sav->tdb_xform->xf_zeroize(sav); sav->tdb_xform = NULL; } else { if (sav->key_auth != NULL) memset(_KEYBUF(sav->key_auth), 0, _KEYLEN(sav->key_auth)); if (sav->key_enc != NULL) memset(_KEYBUF(sav->key_enc), 0, _KEYLEN(sav->key_enc)); } if (sav->key_auth != NULL) { KFREE(sav->key_auth); sav->key_auth = NULL; } if (sav->key_enc != NULL) { KFREE(sav->key_enc); sav->key_enc = NULL; } if (sav->sched) { memset(sav->sched, 0, sav->schedlen); KFREE(sav->sched); sav->sched = NULL; } if (sav->replay != NULL) { KFREE(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; } KFREE(sav); return; } /* * search SAD. * OUT: * NULL : not found * others : found, pointer to a SA. */ static struct secashead * key_getsah(struct secasindex *saidx) { struct secashead *sah; LIST_FOREACH(sah, &sahtree, chain) { if (sah->state == SADB_SASTATE_DEAD) continue; if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) return sah; } return NULL; } /* * check not to be duplicated SPI. * NOTE: this function is too slow due to searching all SAD. * OUT: * NULL : not found * others : found, pointer to a SA. */ static struct secasvar * key_checkspidup(struct secasindex *saidx, u_int32_t spi) { struct secashead *sah; struct secasvar *sav; /* check address family */ if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { ipseclog((LOG_DEBUG, "key_checkspidup: address family mismatched.\n")); return NULL; } /* check all SAD */ LIST_FOREACH(sah, &sahtree, chain) { if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) continue; sav = key_getsavbyspi(sah, spi); if (sav != NULL) return sav; } return NULL; } /* * search SAD litmited alive SA, protocol, SPI. * OUT: * NULL : not found * others : found, pointer to a SA. */ static struct secasvar * key_getsavbyspi(struct secashead *sah, u_int32_t spi) { struct secasvar *sav; u_int stateidx, state; /* search all status */ for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive); stateidx++) { state = saorder_state_alive[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { /* sanity check */ if (sav->state != state) { ipseclog((LOG_DEBUG, "key_getsavbyspi: " "invalid sav->state (queue: %d SA: %d)\n", state, sav->state)); continue; } if (sav->spi == spi) return sav; } } return NULL; } /* * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. * You must update these if need. * OUT: 0: success. * !0: failure. * * does not modify mbuf. does not free mbuf on error. */ static int key_setsaval(struct secasvar *sav, struct mbuf *m, const struct sadb_msghdr *mhp) { int error = 0; /* sanity check */ if (m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_setsaval: NULL pointer is passed"); /* initialization */ sav->replay = NULL; sav->key_auth = NULL; sav->key_enc = NULL; sav->sched = NULL; sav->schedlen = 0; sav->iv = NULL; sav->lft_c = NULL; sav->lft_h = NULL; sav->lft_s = NULL; sav->tdb_xform = NULL; /* transform */ sav->tdb_encalgxform = NULL; /* encoding algorithm */ sav->tdb_authalgxform = NULL; /* authentication algorithm */ sav->tdb_compalgxform = NULL; /* compression algorithm */ #ifdef IPSEC_NAT_T sav->natt_type = 0; sav->esp_frag = 0; #endif /* SA */ if (mhp->ext[SADB_EXT_SA] != NULL) { const struct sadb_sa *sa0; sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { error = EINVAL; goto fail; } sav->alg_auth = sa0->sadb_sa_auth; sav->alg_enc = sa0->sadb_sa_encrypt; sav->flags = sa0->sadb_sa_flags; /* replay window */ if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { sav->replay = (struct secreplay *) malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_SECA, M_NOWAIT|M_ZERO); if (sav->replay == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } if (sa0->sadb_sa_replay != 0) sav->replay->bitmap = (char*)(sav->replay+1); sav->replay->wsize = sa0->sadb_sa_replay; } } /* Authentication keys */ if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { const struct sadb_key *key0; int len; key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; len = mhp->extlen[SADB_EXT_KEY_AUTH]; error = 0; if (len < sizeof(*key0)) { error = EINVAL; goto fail; } switch (mhp->msg->sadb_msg_satype) { case SADB_SATYPE_AH: case SADB_SATYPE_ESP: case SADB_X_SATYPE_TCPSIGNATURE: if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && sav->alg_auth != SADB_X_AALG_NULL) error = EINVAL; break; case SADB_X_SATYPE_IPCOMP: default: error = EINVAL; break; } if (error) { ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth values.\n")); goto fail; } sav->key_auth = (struct sadb_key *)key_newbuf(key0, len); if (sav->key_auth == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } } /* Encryption key */ if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { const struct sadb_key *key0; int len; key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; error = 0; if (len < sizeof(*key0)) { error = EINVAL; goto fail; } switch (mhp->msg->sadb_msg_satype) { case SADB_SATYPE_ESP: if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && sav->alg_enc != SADB_EALG_NULL) { error = EINVAL; break; } sav->key_enc = (struct sadb_key *)key_newbuf(key0, len); if (sav->key_enc == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } break; case SADB_X_SATYPE_IPCOMP: if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) error = EINVAL; sav->key_enc = NULL; /*just in case*/ break; case SADB_SATYPE_AH: case SADB_X_SATYPE_TCPSIGNATURE: default: error = EINVAL; break; } if (error) { ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc value.\n")); goto fail; } } /* set iv */ sav->ivlen = 0; switch (mhp->msg->sadb_msg_satype) { case SADB_SATYPE_AH: error = xform_init(sav, XF_AH); break; case SADB_SATYPE_ESP: error = xform_init(sav, XF_ESP); break; case SADB_X_SATYPE_IPCOMP: error = xform_init(sav, XF_IPCOMP); break; case SADB_X_SATYPE_TCPSIGNATURE: error = xform_init(sav, XF_TCPSIGNATURE); break; } if (error) { ipseclog((LOG_DEBUG, "key_setsaval: unable to initialize SA type %u.\n", mhp->msg->sadb_msg_satype)); goto fail; } /* reset created */ sav->created = time_second; /* make lifetime for CURRENT */ KMALLOC(sav->lft_c, struct sadb_lifetime *, sizeof(struct sadb_lifetime)); if (sav->lft_c == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } sav->lft_c->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; sav->lft_c->sadb_lifetime_allocations = 0; sav->lft_c->sadb_lifetime_bytes = 0; sav->lft_c->sadb_lifetime_addtime = time_second; sav->lft_c->sadb_lifetime_usetime = 0; /* lifetimes for HARD and SOFT */ { const struct sadb_lifetime *lft0; lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; if (lft0 != NULL) { if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { error = EINVAL; goto fail; } sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0, sizeof(*lft0)); if (sav->lft_h == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } /* to be initialize ? */ } lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; if (lft0 != NULL) { if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { error = EINVAL; goto fail; } sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0, sizeof(*lft0)); if (sav->lft_s == NULL) { ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n")); error = ENOBUFS; goto fail; } /* to be initialize ? */ } } return 0; fail: /* initialization */ if (sav->replay != NULL) { KFREE(sav->replay); sav->replay = NULL; } if (sav->key_auth != NULL) { KFREE(sav->key_auth); sav->key_auth = NULL; } if (sav->key_enc != NULL) { KFREE(sav->key_enc); sav->key_enc = NULL; } if (sav->sched) { KFREE(sav->sched); sav->sched = NULL; } if (sav->iv != NULL) { KFREE(sav->iv); sav->iv = 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; } return error; } /* * validation with a secasvar entry, and set SADB_SATYPE_MATURE. * OUT: 0: valid * other: errno */ static int key_mature(struct secasvar *sav) { int error; /* check SPI value */ switch (sav->sah->saidx.proto) { case IPPROTO_ESP: case IPPROTO_AH: if (ntohl(sav->spi) <= 255) { ipseclog((LOG_DEBUG, "key_mature: illegal range of SPI %u.\n", (u_int32_t)ntohl(sav->spi))); return EINVAL; } break; } /* check satype */ switch (sav->sah->saidx.proto) { case IPPROTO_ESP: /* check flags */ if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { ipseclog((LOG_DEBUG, "key_mature: " "invalid flag (derived) given to old-esp.\n")); return EINVAL; } error = xform_init(sav, XF_ESP); break; case IPPROTO_AH: /* check flags */ if (sav->flags & SADB_X_EXT_DERIV) { ipseclog((LOG_DEBUG, "key_mature: " "invalid flag (derived) given to AH SA.\n")); return EINVAL; } if (sav->alg_enc != SADB_EALG_NONE) { ipseclog((LOG_DEBUG, "key_mature: " "protocol and algorithm mismated.\n")); return(EINVAL); } error = xform_init(sav, XF_AH); break; case IPPROTO_IPCOMP: if (sav->alg_auth != SADB_AALG_NONE) { ipseclog((LOG_DEBUG, "key_mature: " "protocol and algorithm mismated.\n")); return(EINVAL); } if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 && ntohl(sav->spi) >= 0x10000) { ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n")); return(EINVAL); } error = xform_init(sav, XF_IPCOMP); break; case IPPROTO_TCP: if (sav->alg_enc != SADB_EALG_NONE) { ipseclog((LOG_DEBUG, "%s: protocol and algorithm " "mismated.\n", __func__)); return(EINVAL); } error = xform_init(sav, XF_TCPSIGNATURE); break; default: ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n")); error = EPROTONOSUPPORT; break; } if (error == 0) key_sa_chgstate(sav, SADB_SASTATE_MATURE); return (error); } /* * subroutine for SADB_GET and SADB_DUMP. */ static struct mbuf * key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, u_int32_t seq, u_int32_t pid) { struct mbuf *result = NULL, *tres = NULL, *m; int l = 0; int i; void *p; int dumporder[] = { SADB_EXT_SA, SADB_X_EXT_SA2, SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, #ifdef IPSEC_NAT_T SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OA, SADB_X_EXT_NAT_T_FRAG, #endif }; m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); if (m == NULL) goto fail; result = m; for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { m = NULL; p = NULL; switch (dumporder[i]) { case SADB_EXT_SA: m = key_setsadbsa(sav); if (!m) goto fail; break; case SADB_X_EXT_SA2: m = key_setsadbxsa2(sav->sah->saidx.mode, sav->replay ? sav->replay->count : 0, sav->sah->saidx.reqid); if (!m) goto fail; break; case SADB_EXT_ADDRESS_SRC: m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sav->sah->saidx.src.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) goto fail; break; case SADB_EXT_ADDRESS_DST: m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sav->sah->saidx.dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) goto fail; break; case SADB_EXT_KEY_AUTH: if (!sav->key_auth) continue; l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len); p = sav->key_auth; break; case SADB_EXT_KEY_ENCRYPT: if (!sav->key_enc) continue; l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len); p = sav->key_enc; break; case SADB_EXT_LIFETIME_CURRENT: if (!sav->lft_c) continue; l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len); p = sav->lft_c; break; case SADB_EXT_LIFETIME_HARD: if (!sav->lft_h) continue; l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len); p = sav->lft_h; break; case SADB_EXT_LIFETIME_SOFT: if (!sav->lft_s) continue; l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len); p = sav->lft_s; break; #ifdef IPSEC_NAT_T case SADB_X_EXT_NAT_T_TYPE: if ((m = key_setsadbxtype(sav->natt_type)) == NULL) goto fail; break; case SADB_X_EXT_NAT_T_DPORT: if ((m = key_setsadbxport( key_portfromsaddr(&sav->sah->saidx.dst), SADB_X_EXT_NAT_T_DPORT)) == NULL) goto fail; break; case SADB_X_EXT_NAT_T_SPORT: if ((m = key_setsadbxport( key_portfromsaddr(&sav->sah->saidx.src), SADB_X_EXT_NAT_T_SPORT)) == NULL) goto fail; break; case SADB_X_EXT_NAT_T_OA: case SADB_X_EXT_NAT_T_FRAG: continue; #endif case SADB_EXT_ADDRESS_PROXY: case SADB_EXT_IDENTITY_SRC: case SADB_EXT_IDENTITY_DST: /* XXX: should we brought from SPD ? */ case SADB_EXT_SENSITIVITY: default: continue; } if ((!m && !p) || (m && p)) goto fail; if (p && tres) { M_PREPEND(tres, l, M_DONTWAIT); if (!tres) goto fail; memcpy(mtod(tres, void *), p, l); continue; } if (p) { m = key_alloc_mbuf(l); if (!m) goto fail; m_copyback(m, 0, l, p); } if (tres) m_cat(m, tres); tres = m; } m_cat(result, tres); if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) goto fail; } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); return result; fail: m_freem(result); m_freem(tres); return NULL; } #ifdef IPSEC_NAT_T /* * set a type in sadb_x_nat_t_type */ static struct mbuf * key_setsadbxtype(u_int16_t type) { struct mbuf *m; size_t len; struct sadb_x_nat_t_type *p; len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_x_nat_t_type *); memset(p, 0, len); p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; p->sadb_x_nat_t_type_type = type; return m; } /* * set a port in sadb_x_nat_t_port. port is in network order */ static struct mbuf * key_setsadbxport(u_int16_t port, u_int16_t type) { struct mbuf *m; size_t len; struct sadb_x_nat_t_port *p; len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_x_nat_t_port *); memset(p, 0, len); p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); p->sadb_x_nat_t_port_exttype = type; p->sadb_x_nat_t_port_port = port; return m; } /* * Get port from sockaddr, port is in network order */ u_int16_t key_portfromsaddr(const union sockaddr_union *saddr) { u_int16_t port; switch (saddr->sa.sa_family) { case AF_INET: { port = saddr->sin.sin_port; break; } #ifdef INET6 case AF_INET6: { port = saddr->sin6.sin6_port; break; } #endif default: printf("key_portfromsaddr: unexpected address family\n"); port = 0; break; } return port; } #endif /* IPSEC_NAT_T */ /* * Set port is struct sockaddr. port is in network order */ static void key_porttosaddr(union sockaddr_union *saddr, u_int16_t port) { switch (saddr->sa.sa_family) { case AF_INET: { saddr->sin.sin_port = port; break; } #ifdef INET6 case AF_INET6: { saddr->sin6.sin6_port = port; break; } #endif default: printf("key_porttosaddr: unexpected address family %d\n", saddr->sa.sa_family); break; } return; } /* * Safety check sa_len */ static int key_checksalen(const union sockaddr_union *saddr) { switch (saddr->sa.sa_family) { case AF_INET: if (saddr->sa.sa_len != sizeof(struct sockaddr_in)) return -1; break; #ifdef INET6 case AF_INET6: if (saddr->sa.sa_len != sizeof(struct sockaddr_in6)) return -1; break; #endif default: printf("key_checksalen: unexpected sa_family %d\n", saddr->sa.sa_family); return -1; break; } return 0; } /* * set data into sadb_msg. */ static struct mbuf * key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, pid_t pid, u_int16_t reserved) { struct mbuf *m; struct sadb_msg *p; int len; len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); if (len > MCLBYTES) return NULL; MGETHDR(m, M_DONTWAIT, MT_DATA); if (m && len > MHLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_freem(m); m = NULL; } } if (!m) return NULL; m->m_pkthdr.len = m->m_len = len; m->m_next = NULL; p = mtod(m, struct sadb_msg *); memset(p, 0, len); p->sadb_msg_version = PF_KEY_V2; p->sadb_msg_type = type; p->sadb_msg_errno = 0; p->sadb_msg_satype = satype; p->sadb_msg_len = PFKEY_UNIT64(tlen); p->sadb_msg_reserved = reserved; p->sadb_msg_seq = seq; p->sadb_msg_pid = (u_int32_t)pid; return m; } /* * copy secasvar data into sadb_address. */ static struct mbuf * key_setsadbsa(struct secasvar *sav) { struct mbuf *m; struct sadb_sa *p; int len; len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_sa *); memset(p, 0, len); p->sadb_sa_len = PFKEY_UNIT64(len); p->sadb_sa_exttype = SADB_EXT_SA; p->sadb_sa_spi = sav->spi; p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); p->sadb_sa_state = sav->state; p->sadb_sa_auth = sav->alg_auth; p->sadb_sa_encrypt = sav->alg_enc; p->sadb_sa_flags = sav->flags; return m; } /* * set data into sadb_address. */ static struct mbuf * key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) { struct mbuf *m; struct sadb_address *p; size_t len; len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + PFKEY_ALIGN8(saddr->sa_len); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_address *); memset(p, 0, len); p->sadb_address_len = PFKEY_UNIT64(len); p->sadb_address_exttype = exttype; p->sadb_address_proto = ul_proto; if (prefixlen == FULLMASK) { switch (saddr->sa_family) { case AF_INET: prefixlen = sizeof(struct in_addr) << 3; break; case AF_INET6: prefixlen = sizeof(struct in6_addr) << 3; break; default: ; /*XXX*/ } } p->sadb_address_prefixlen = prefixlen; p->sadb_address_reserved = 0; memcpy(mtod(m, char *) + PFKEY_ALIGN8(sizeof(struct sadb_address)), saddr, saddr->sa_len); return m; } #if 0 /* * set data into sadb_ident. */ static struct mbuf * key_setsadbident(u_int16_t exttype, u_int16_t idtype, void *string, int stringlen, u_int64_t id) { struct mbuf *m; struct sadb_ident *p; size_t len; len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_ident *); memset(p, 0, len); p->sadb_ident_len = PFKEY_UNIT64(len); p->sadb_ident_exttype = exttype; p->sadb_ident_type = idtype; p->sadb_ident_reserved = 0; p->sadb_ident_id = id; memcpy(mtod(m, void *) + PFKEY_ALIGN8(sizeof(struct sadb_ident)), string, stringlen); return m; } #endif /* * set data into sadb_x_sa2. */ static struct mbuf * key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int16_t reqid) { struct mbuf *m; struct sadb_x_sa2 *p; size_t len; len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_x_sa2 *); memset(p, 0, len); p->sadb_x_sa2_len = PFKEY_UNIT64(len); p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; p->sadb_x_sa2_mode = mode; p->sadb_x_sa2_reserved1 = 0; p->sadb_x_sa2_reserved2 = 0; p->sadb_x_sa2_sequence = seq; p->sadb_x_sa2_reqid = reqid; return m; } /* * set data into sadb_x_policy */ static struct mbuf * key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) { struct mbuf *m; struct sadb_x_policy *p; size_t len; len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); return NULL; } p = mtod(m, struct sadb_x_policy *); memset(p, 0, len); p->sadb_x_policy_len = PFKEY_UNIT64(len); p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; p->sadb_x_policy_type = type; p->sadb_x_policy_dir = dir; p->sadb_x_policy_id = id; return m; } /* %%% utilities */ /* * copy a buffer into the new buffer allocated. */ static void * key_newbuf(const void *src, u_int len) { void *new; KMALLOC(new, void *, len); if (new == NULL) { ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n")); return NULL; } memcpy(new, src, len); return new; } /* compare my own address * OUT: 1: true, i.e. my address. * 0: false */ int key_ismyaddr(struct sockaddr *sa) { #ifdef INET struct sockaddr_in *sin; struct in_ifaddr *ia; #endif /* sanity check */ if (sa == NULL) panic("key_ismyaddr: NULL pointer is passed"); switch (sa->sa_family) { #ifdef INET case AF_INET: sin = (struct sockaddr_in *)sa; for (ia = in_ifaddrhead.tqh_first; ia; ia = ia->ia_link.tqe_next) { if (sin->sin_family == ia->ia_addr.sin_family && sin->sin_len == ia->ia_addr.sin_len && sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) { return 1; } } break; #endif #ifdef INET6 case AF_INET6: return key_ismyaddr6((struct sockaddr_in6 *)sa); #endif } return 0; } #ifdef INET6 /* * compare my own address for IPv6. * 1: ours * 0: other * NOTE: derived ip6_input() in KAME. This is necessary to modify more. */ #include static int key_ismyaddr6(struct sockaddr_in6 *sin6) { struct in6_ifaddr *ia; struct in6_multi *in6m; for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (key_sockaddrcmp((struct sockaddr *)&sin6, (struct sockaddr *)&ia->ia_addr, 0) == 0) return 1; /* * XXX Multicast * XXX why do we care about multlicast here while we don't care * about IPv4 multicast?? * XXX scope */ in6m = NULL; #ifdef __FreeBSD__ IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); #else for ((in6m) = ia->ia6_multiaddrs.lh_first; (in6m) != NULL && !IN6_ARE_ADDR_EQUAL(&(in6m)->in6m_addr, &sin6->sin6_addr); (in6m) = in6m->in6m_entry.le_next) continue; #endif if (in6m) return 1; } /* loopback, just for safety */ if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) return 1; return 0; } #endif /*INET6*/ /* * compare two secasindex structure. * flag can specify to compare 2 saidxes. * compare two secasindex structure without both mode and reqid. * don't compare port. * IN: * saidx0: source, it can be in SAD. * saidx1: object. * OUT: * 1 : equal * 0 : not equal */ static int key_cmpsaidx( const struct secasindex *saidx0, const struct secasindex *saidx1, int flag) { int chkport = 0; /* sanity */ if (saidx0 == NULL && saidx1 == NULL) return 1; if (saidx0 == NULL || saidx1 == NULL) return 0; if (saidx0->proto != saidx1->proto) return 0; if (flag == CMP_EXACTLY) { if (saidx0->mode != saidx1->mode) return 0; if (saidx0->reqid != saidx1->reqid) return 0; if (memcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || memcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) return 0; } else { /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ if (flag == CMP_MODE_REQID ||flag == CMP_REQID) { /* * If reqid of SPD is non-zero, unique SA is required. * The result must be of same reqid in this case. */ if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) return 0; } if (flag == CMP_MODE_REQID) { if (saidx0->mode != IPSEC_MODE_ANY && saidx0->mode != saidx1->mode) return 0; } /* * If NAT-T is enabled, check ports for tunnel mode. * Don't do it for transport mode, as there is no * port information available in the SP. */ #ifdef IPSEC_NAT_T if (saidx1->mode == IPSEC_MODE_TUNNEL) chkport = 1; #endif if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { return 0; } if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { return 0; } } return 1; } /* * compare two secindex structure exactly. * IN: * spidx0: source, it is often in SPD. * spidx1: object, it is often from PFKEY message. * OUT: * 1 : equal * 0 : not equal */ int key_cmpspidx_exactly( struct secpolicyindex *spidx0, struct secpolicyindex *spidx1) { /* sanity */ if (spidx0 == NULL && spidx1 == NULL) return 1; if (spidx0 == NULL || spidx1 == NULL) return 0; if (spidx0->prefs != spidx1->prefs || spidx0->prefd != spidx1->prefd || spidx0->ul_proto != spidx1->ul_proto) return 0; return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; } /* * compare two secindex structure with mask. * IN: * spidx0: source, it is often in SPD. * spidx1: object, it is often from IP header. * OUT: * 1 : equal * 0 : not equal */ int key_cmpspidx_withmask( struct secpolicyindex *spidx0, struct secpolicyindex *spidx1) { /* sanity */ if (spidx0 == NULL && spidx1 == NULL) return 1; if (spidx0 == NULL || spidx1 == NULL) return 0; if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) return 0; /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY && spidx0->ul_proto != spidx1->ul_proto) return 0; switch (spidx0->src.sa.sa_family) { case AF_INET: if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) return 0; if (!key_bbcmp(&spidx0->src.sin.sin_addr, &spidx1->src.sin.sin_addr, spidx0->prefs)) return 0; break; case AF_INET6: if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) return 0; /* * scope_id check. if sin6_scope_id is 0, we regard it * as a wildcard scope, which matches any scope zone ID. */ if (spidx0->src.sin6.sin6_scope_id && spidx1->src.sin6.sin6_scope_id && spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) return 0; if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, &spidx1->src.sin6.sin6_addr, spidx0->prefs)) return 0; break; default: /* XXX */ if (memcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) return 0; break; } switch (spidx0->dst.sa.sa_family) { case AF_INET: if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) return 0; if (!key_bbcmp(&spidx0->dst.sin.sin_addr, &spidx1->dst.sin.sin_addr, spidx0->prefd)) return 0; break; case AF_INET6: if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) return 0; /* * scope_id check. if sin6_scope_id is 0, we regard it * as a wildcard scope, which matches any scope zone ID. */ if (spidx0->src.sin6.sin6_scope_id && spidx1->src.sin6.sin6_scope_id && spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) return 0; if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) return 0; break; default: /* XXX */ if (memcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) return 0; break; } /* XXX Do we check other field ? e.g. flowinfo */ return 1; } /* returns 0 on match */ static int key_sockaddrcmp( const struct sockaddr *sa1, const struct sockaddr *sa2, int port) { #ifdef satosin #undef satosin #endif #define satosin(s) ((const struct sockaddr_in *)s) #ifdef satosin6 #undef satosin6 #endif #define satosin6(s) ((const struct sockaddr_in6 *)s) if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) return 1; switch (sa1->sa_family) { case AF_INET: if (sa1->sa_len != sizeof(struct sockaddr_in)) return 1; if (satosin(sa1)->sin_addr.s_addr != satosin(sa2)->sin_addr.s_addr) { return 1; } if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) return 1; break; case AF_INET6: if (sa1->sa_len != sizeof(struct sockaddr_in6)) return 1; /*EINVAL*/ if (satosin6(sa1)->sin6_scope_id != satosin6(sa2)->sin6_scope_id) { return 1; } if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, &satosin6(sa2)->sin6_addr)) { return 1; } if (port && satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { return 1; } break; default: if (memcmp(sa1, sa2, sa1->sa_len) != 0) return 1; break; } return 0; #undef satosin #undef satosin6 } /* * compare two buffers with mask. * IN: * addr1: source * addr2: object * bits: Number of bits to compare * OUT: * 1 : equal * 0 : not equal */ static int key_bbcmp(const void *a1, const void *a2, u_int bits) { const unsigned char *p1 = a1; const unsigned char *p2 = a2; /* XXX: This could be considerably faster if we compare a word * at a time, but it is complicated on LSB Endian machines */ /* Handle null pointers */ if (p1 == NULL || p2 == NULL) return (p1 == p2); while (bits >= 8) { if (*p1++ != *p2++) return 0; bits -= 8; } if (bits > 0) { u_int8_t mask = ~((1<<(8-bits))-1); if ((*p1 & mask) != (*p2 & mask)) return 0; } return 1; /* Match! */ } /* * time handler. * scanning SPD and SAD to check status for each entries, * and do to remove or to expire. */ void key_timehandler(void* arg) { u_int dir; int s; time_t now = time_second; s = splsoftnet(); /*called from softclock()*/ mutex_enter(softnet_lock); /* SPD */ { struct secpolicy *sp, *nextsp; for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { for (sp = LIST_FIRST(&sptree[dir]); sp != NULL; sp = nextsp) { nextsp = LIST_NEXT(sp, chain); if (sp->state == IPSEC_SPSTATE_DEAD) { key_sp_unlink(sp); /*XXX*/ /* 'sp' dead; continue transfers to * 'sp = nextsp' */ continue; } if (sp->lifetime == 0 && sp->validtime == 0) continue; /* the deletion will occur next time */ if ((sp->lifetime && now - sp->created > sp->lifetime) || (sp->validtime && now - sp->lastused > sp->validtime)) { key_sp_dead(sp); key_spdexpire(sp); continue; } } } } /* SAD */ { struct secashead *sah, *nextsah; struct secasvar *sav, *nextsav; for (sah = LIST_FIRST(&sahtree); sah != NULL; sah = nextsah) { nextsah = LIST_NEXT(sah, chain); /* if sah has been dead, then delete it and process next sah. */ if (sah->state == SADB_SASTATE_DEAD) { key_delsah(sah); continue; } /* if LARVAL entry doesn't become MATURE, delete it. */ for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_LARVAL]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); if (now - sav->created > key_larval_lifetime) { KEY_FREESAV(&sav); } } /* * check MATURE entry to start to send expire message * whether or not. */ for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_MATURE]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); /* we don't need to check. */ if (sav->lft_s == NULL) continue; /* sanity check */ if (sav->lft_c == NULL) { ipseclog((LOG_DEBUG,"key_timehandler: " "There is no CURRENT time, why?\n")); continue; } /* check SOFT lifetime */ if (sav->lft_s->sadb_lifetime_addtime != 0 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) { /* * check SA to be used whether or not. * when SA hasn't been used, delete it. */ if (sav->lft_c->sadb_lifetime_usetime == 0) { key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); } else { key_sa_chgstate(sav, SADB_SASTATE_DYING); /* * XXX If we keep to send expire * message in the status of * DYING. Do remove below code. */ key_expire(sav); } } /* check SOFT lifetime by bytes */ /* * XXX I don't know the way to delete this SA * when new SA is installed. Caution when it's * installed too big lifetime by time. */ else if (sav->lft_s->sadb_lifetime_bytes != 0 && sav->lft_s->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) { key_sa_chgstate(sav, SADB_SASTATE_DYING); /* * XXX If we keep to send expire * message in the status of * DYING. Do remove below code. */ key_expire(sav); } } /* check DYING entry to change status to DEAD. */ for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DYING]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); /* we don't need to check. */ if (sav->lft_h == NULL) continue; /* sanity check */ if (sav->lft_c == NULL) { ipseclog((LOG_DEBUG, "key_timehandler: " "There is no CURRENT time, why?\n")); continue; } if (sav->lft_h->sadb_lifetime_addtime != 0 && now - sav->created > sav->lft_h->sadb_lifetime_addtime) { key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); } #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ else if (sav->lft_s != NULL && sav->lft_s->sadb_lifetime_addtime != 0 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) { /* * XXX: should be checked to be * installed the valid SA. */ /* * If there is no SA then sending * expire message. */ key_expire(sav); } #endif /* check HARD lifetime by bytes */ else if (sav->lft_h->sadb_lifetime_bytes != 0 && sav->lft_h->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) { key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); } } /* delete entry in DEAD */ for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DEAD]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); /* sanity check */ if (sav->state != SADB_SASTATE_DEAD) { ipseclog((LOG_DEBUG, "key_timehandler: " "invalid sav->state " "(queue: %d SA: %d): " "kill it anyway\n", SADB_SASTATE_DEAD, sav->state)); } /* * do not call key_freesav() here. * sav should already be freed, and sav->refcnt * shows other references to sav * (such as from SPD). */ } } } #ifndef IPSEC_NONBLOCK_ACQUIRE /* ACQ tree */ { struct secacq *acq, *nextacq; for (acq = LIST_FIRST(&acqtree); acq != NULL; acq = nextacq) { nextacq = LIST_NEXT(acq, chain); if (now - acq->created > key_blockacq_lifetime && __LIST_CHAINED(acq)) { LIST_REMOVE(acq, chain); KFREE(acq); } } } #endif /* SP ACQ tree */ { struct secspacq *acq, *nextacq; for (acq = LIST_FIRST(&spacqtree); acq != NULL; acq = nextacq) { nextacq = LIST_NEXT(acq, chain); if (now - acq->created > key_blockacq_lifetime && __LIST_CHAINED(acq)) { LIST_REMOVE(acq, chain); KFREE(acq); } } } /* initialize random seed */ if (key_tick_init_random++ > key_int_random) { key_tick_init_random = 0; key_srandom(); } #ifndef IPSEC_DEBUG2 /* do exchange to tick time !! */ callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); #endif /* IPSEC_DEBUG2 */ mutex_exit(softnet_lock); splx(s); return; } #ifdef __NetBSD__ void srandom(int); void srandom(int arg) {return;} #endif /* * to initialize a seed for random() */ static void key_srandom(void) { srandom(time_second); } u_long key_random(void) { u_long value; key_randomfill(&value, sizeof(value)); return value; } void key_randomfill(void *p, size_t l) { size_t n; u_long v; static int warn = 1; n = 0; n = (size_t)read_random(p, (u_int)l); /* last resort */ while (n < l) { v = random(); memcpy((u_int8_t *)p + n, &v, l - n < sizeof(v) ? l - n : sizeof(v)); n += sizeof(v); if (warn) { printf("WARNING: pseudo-random number generator " "used for IPsec processing\n"); warn = 0; } } } /* * map SADB_SATYPE_* to IPPROTO_*. * if satype == SADB_SATYPE then satype is mapped to ~0. * OUT: * 0: invalid satype. */ static u_int16_t key_satype2proto(u_int8_t satype) { switch (satype) { case SADB_SATYPE_UNSPEC: return IPSEC_PROTO_ANY; case SADB_SATYPE_AH: return IPPROTO_AH; case SADB_SATYPE_ESP: return IPPROTO_ESP; case SADB_X_SATYPE_IPCOMP: return IPPROTO_IPCOMP; case SADB_X_SATYPE_TCPSIGNATURE: return IPPROTO_TCP; default: return 0; } /* NOTREACHED */ } /* * map IPPROTO_* to SADB_SATYPE_* * OUT: * 0: invalid protocol type. */ static u_int8_t key_proto2satype(u_int16_t proto) { switch (proto) { case IPPROTO_AH: return SADB_SATYPE_AH; case IPPROTO_ESP: return SADB_SATYPE_ESP; case IPPROTO_IPCOMP: return SADB_X_SATYPE_IPCOMP; case IPPROTO_TCP: return SADB_X_SATYPE_TCPSIGNATURE; default: return 0; } /* NOTREACHED */ } static int key_setsecasidx(int proto, int mode, int reqid, const struct sadb_address * src, const struct sadb_address * dst, struct secasindex * saidx) { const union sockaddr_union * src_u = (const union sockaddr_union *) src; const union sockaddr_union * dst_u = (const union sockaddr_union *) dst; /* sa len safety check */ if (key_checksalen(src_u) != 0) return -1; if (key_checksalen(dst_u) != 0) return -1; memset(saidx, 0, sizeof(*saidx)); saidx->proto = proto; saidx->mode = mode; saidx->reqid = reqid; memcpy(&saidx->src, src_u, src_u->sa.sa_len); memcpy(&saidx->dst, dst_u, dst_u->sa.sa_len); #ifndef IPSEC_NAT_T key_porttosaddr(&((saidx)->src),0); key_porttosaddr(&((saidx)->dst),0); #endif return 0; } /* %%% PF_KEY */ /* * SADB_GETSPI processing is to receive * * from the IKMPd, to assign a unique spi value, to hang on the INBOUND * tree with the status of LARVAL, and send * * to the IKMPd. * * IN: mhp: pointer to the pointer to each header. * OUT: NULL if fail. * other if success, return pointer to the message to send. */ static int key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *newsah; struct secasvar *newsav; u_int8_t proto; u_int32_t spi; u_int8_t mode; u_int16_t reqid; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_getspi: NULL pointer is passed"); if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_X_EXT_SA2] != NULL) { mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; } else { mode = IPSEC_MODE_ANY; reqid = 0; } src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if ((error = key_setsecasidx(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* SPI allocation */ spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], &saidx); if (spi == 0) return key_senderror(so, m, EINVAL); /* get a SA index */ if ((newsah = key_getsah(&saidx)) == NULL) { /* create a new SA index */ if ((newsah = key_newsah(&saidx)) == NULL) { ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } } /* get a new SA */ /* XXX rewrite */ newsav = KEY_NEWSAV(m, mhp, newsah, &error); if (newsav == NULL) { /* XXX don't free new SA index allocated in above. */ return key_senderror(so, m, error); } /* set spi */ newsav->spi = htonl(spi); #ifndef IPSEC_NONBLOCK_ACQUIRE /* delete the entry in acqtree */ if (mhp->msg->sadb_msg_seq != 0) { struct secacq *acq; if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { /* reset counter in order to deletion by timehandler. */ acq->created = time_second; acq->count = 0; } } #endif { struct mbuf *n, *nn; struct sadb_sa *m_sa; struct sadb_msg *newmsg; int off, len; /* create new sadb_msg to reply. */ len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + PFKEY_ALIGN8(sizeof(struct sadb_sa)); if (len > MCLBYTES) return key_senderror(so, m, ENOBUFS); MGETHDR(n, M_DONTWAIT, MT_DATA); if (len > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_freem(n); n = NULL; } } if (!n) return key_senderror(so, m, ENOBUFS); n->m_len = len; n->m_next = NULL; off = 0; m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); m_sa = (struct sadb_sa *)(mtod(n, char *) + off); m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); m_sa->sadb_sa_exttype = SADB_EXT_SA; m_sa->sadb_sa_spi = htonl(spi); off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); #ifdef DIAGNOSTIC if (off != len) panic("length inconsistency in key_getspi"); #endif n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); if (!n->m_next) { m_freem(n); return key_senderror(so, m, ENOBUFS); } if (n->m_len < sizeof(struct sadb_msg)) { n = m_pullup(n, sizeof(struct sadb_msg)); if (n == NULL) return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); } n->m_pkthdr.len = 0; for (nn = n; nn; nn = nn->m_next) n->m_pkthdr.len += nn->m_len; newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_seq = newsav->seq; newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); } } /* * allocating new SPI * called by key_getspi(). * OUT: * 0: failure. * others: success. */ static u_int32_t key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx) { u_int32_t newspi; u_int32_t spmin, spmax; int count = key_spi_trycnt; /* set spi range to allocate */ if (spirange != NULL) { spmin = spirange->sadb_spirange_min; spmax = spirange->sadb_spirange_max; } else { spmin = key_spi_minval; spmax = key_spi_maxval; } /* IPCOMP needs 2-byte SPI */ if (saidx->proto == IPPROTO_IPCOMP) { u_int32_t t; if (spmin >= 0x10000) spmin = 0xffff; if (spmax >= 0x10000) spmax = 0xffff; if (spmin > spmax) { t = spmin; spmin = spmax; spmax = t; } } if (spmin == spmax) { if (key_checkspidup(saidx, htonl(spmin)) != NULL) { ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists already.\n", spmin)); return 0; } count--; /* taking one cost. */ newspi = spmin; } else { /* init SPI */ newspi = 0; /* when requesting to allocate spi ranged */ while (count--) { /* generate pseudo-random SPI value ranged. */ newspi = spmin + (key_random() % (spmax - spmin + 1)); if (key_checkspidup(saidx, htonl(newspi)) == NULL) break; } if (count == 0 || newspi == 0) { ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is failed.\n")); return 0; } } /* statistics */ keystat.getspi_count = (keystat.getspi_count + key_spi_trycnt - count) / 2; return newspi; } #ifdef IPSEC_NAT_T /* Handle IPSEC_NAT_T info if present */ static int key_handle_natt_info(struct secasvar *sav, const struct sadb_msghdr *mhp) { if (mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) printf("update: NAT-T OA present\n"); if ((mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL) && (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL) && (mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL)) { struct sadb_x_nat_t_type *type; struct sadb_x_nat_t_port *sport; struct sadb_x_nat_t_port *dport; struct sadb_address *addr; struct sadb_x_nat_t_frag *frag; if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) || (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) || (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) { ipseclog((LOG_DEBUG, "key_update: " "invalid message.\n")); return -1; } if ((mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) && (mhp->extlen[SADB_X_EXT_NAT_T_OA] < sizeof(*addr))) { ipseclog((LOG_DEBUG, "key_update: invalid message\n")); return -1; } if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) && (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) { ipseclog((LOG_DEBUG, "key_update: invalid message\n")); return -1; } type = (struct sadb_x_nat_t_type *) mhp->ext[SADB_X_EXT_NAT_T_TYPE]; sport = (struct sadb_x_nat_t_port *) mhp->ext[SADB_X_EXT_NAT_T_SPORT]; dport = (struct sadb_x_nat_t_port *) mhp->ext[SADB_X_EXT_NAT_T_DPORT]; addr = (struct sadb_address *) mhp->ext[SADB_X_EXT_NAT_T_OA]; frag = (struct sadb_x_nat_t_frag *) mhp->ext[SADB_X_EXT_NAT_T_FRAG]; if (type) sav->natt_type = type->sadb_x_nat_t_type_type; if (sport) key_porttosaddr(&sav->sah->saidx.src, sport->sadb_x_nat_t_port_port); if (dport) key_porttosaddr(&sav->sah->saidx.dst, dport->sadb_x_nat_t_port_port); if (frag) sav->esp_frag = frag->sadb_x_nat_t_frag_fraglen; else sav->esp_frag = IP_MAXPACKET; } return 0; } #endif /* * SADB_UPDATE processing * receive * * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. * and send * * to the ikmpd. * * m will always be freed. */ static int key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_sa *sa0; struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *sah; struct secasvar *sav; u_int16_t proto; u_int8_t mode; u_int16_t reqid; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_update: NULL pointer is passed"); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_SA] == NULL || mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_X_EXT_SA2] != NULL) { mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; } else { mode = IPSEC_MODE_ANY; reqid = 0; } /* XXX boundary checking for other extensions */ sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); if ((error = key_setsecasidx(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* get a SA header */ if ((sah = key_getsah(&saidx)) == NULL) { ipseclog((LOG_DEBUG, "key_update: no SA index found.\n")); return key_senderror(so, m, ENOENT); } /* set spidx if there */ /* XXX rewrite */ error = key_setident(sah, m, mhp); if (error) return key_senderror(so, m, error); /* find a SA with sequence number. */ #ifdef IPSEC_DOSEQCHECK if (mhp->msg->sadb_msg_seq != 0 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { ipseclog((LOG_DEBUG, "key_update: no larval SA with sequence %u exists.\n", mhp->msg->sadb_msg_seq)); return key_senderror(so, m, ENOENT); } #else if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) { ipseclog((LOG_DEBUG, "key_update: no such a SA found (spi:%u)\n", (u_int32_t)ntohl(sa0->sadb_sa_spi))); return key_senderror(so, m, EINVAL); } #endif /* validity check */ if (sav->sah->saidx.proto != proto) { ipseclog((LOG_DEBUG, "key_update: protocol mismatched (DB=%u param=%u)\n", sav->sah->saidx.proto, proto)); return key_senderror(so, m, EINVAL); } #ifdef IPSEC_DOSEQCHECK if (sav->spi != sa0->sadb_sa_spi) { ipseclog((LOG_DEBUG, "key_update: SPI mismatched (DB:%u param:%u)\n", (u_int32_t)ntohl(sav->spi), (u_int32_t)ntohl(sa0->sadb_sa_spi))); return key_senderror(so, m, EINVAL); } #endif if (sav->pid != mhp->msg->sadb_msg_pid) { ipseclog((LOG_DEBUG, "key_update: pid mismatched (DB:%u param:%u)\n", sav->pid, mhp->msg->sadb_msg_pid)); return key_senderror(so, m, EINVAL); } /* copy sav values */ error = key_setsaval(sav, m, mhp); if (error) { KEY_FREESAV(&sav); return key_senderror(so, m, error); } /* check SA values to be mature. */ if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { KEY_FREESAV(&sav); return key_senderror(so, m, 0); } #ifdef IPSEC_NAT_T if ((error = key_handle_natt_info(sav,mhp)) != 0) return key_senderror(so, m, EINVAL); #endif /* IPSEC_NAT_T */ { struct mbuf *n; /* set msg buf from mhp */ n = key_getmsgbuf_x1(m, mhp); if (n == NULL) { ipseclog((LOG_DEBUG, "key_update: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. * only called by key_update(). * OUT: * NULL : not found * others : found, pointer to a SA. */ #ifdef IPSEC_DOSEQCHECK static struct secasvar * key_getsavbyseq(struct secashead *sah, u_int32_t seq) { struct secasvar *sav; u_int state; state = SADB_SASTATE_LARVAL; /* search SAD with sequence number ? */ LIST_FOREACH(sav, &sah->savtree[state], chain) { KEY_CHKSASTATE(state, sav->state, "key_getsabyseq"); if (sav->seq == seq) { SA_ADDREF(sav); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP key_getsavbyseq cause " "refcnt++:%d SA:%p\n", sav->refcnt, sav)); return sav; } } return NULL; } #endif /* * SADB_ADD processing * add an entry to SA database, when received * * from the ikmpd, * and send * * to the ikmpd. * * IGNORE identity and sensitivity messages. * * m will always be freed. */ static int key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_sa *sa0; struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *newsah; struct secasvar *newsav; u_int16_t proto; u_int8_t mode; u_int16_t reqid; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_add: NULL pointer is passed"); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_SA] == NULL || mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { /* XXX need more */ ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_X_EXT_SA2] != NULL) { mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; } else { mode = IPSEC_MODE_ANY; reqid = 0; } sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; if ((error = key_setsecasidx(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* get a SA header */ if ((newsah = key_getsah(&saidx)) == NULL) { /* create a new SA header */ if ((newsah = key_newsah(&saidx)) == NULL) { ipseclog((LOG_DEBUG, "key_add: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } } /* set spidx if there */ /* XXX rewrite */ error = key_setident(newsah, m, mhp); if (error) { return key_senderror(so, m, error); } /* create new SA entry. */ /* We can create new SA only if SPI is differenct. */ if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) { ipseclog((LOG_DEBUG, "key_add: SA already exists.\n")); return key_senderror(so, m, EEXIST); } newsav = KEY_NEWSAV(m, mhp, newsah, &error); if (newsav == NULL) { return key_senderror(so, m, error); } /* check SA values to be mature. */ if ((error = key_mature(newsav)) != 0) { KEY_FREESAV(&newsav); return key_senderror(so, m, error); } #ifdef IPSEC_NAT_T if ((error = key_handle_natt_info(newsav, mhp)) != 0) return key_senderror(so, m, EINVAL); #endif /* IPSEC_NAT_T */ /* * don't call key_freesav() here, as we would like to keep the SA * in the database on success. */ { struct mbuf *n; /* set msg buf from mhp */ n = key_getmsgbuf_x1(m, mhp); if (n == NULL) { ipseclog((LOG_DEBUG, "key_update: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* m is retained */ static int key_setident(struct secashead *sah, struct mbuf *m, const struct sadb_msghdr *mhp) { const struct sadb_ident *idsrc, *iddst; int idsrclen, iddstlen; /* sanity check */ if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_setident: NULL pointer is passed"); /* don't make buffer if not there */ if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { sah->idents = NULL; sah->identd = NULL; return 0; } if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n")); return EINVAL; } idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; /* validity check */ if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n")); return EINVAL; } switch (idsrc->sadb_ident_type) { case SADB_IDENTTYPE_PREFIX: case SADB_IDENTTYPE_FQDN: case SADB_IDENTTYPE_USERFQDN: default: /* XXX do nothing */ sah->idents = NULL; sah->identd = NULL; return 0; } /* make structure */ KMALLOC(sah->idents, struct sadb_ident *, idsrclen); if (sah->idents == NULL) { ipseclog((LOG_DEBUG, "key_setident: No more memory.\n")); return ENOBUFS; } KMALLOC(sah->identd, struct sadb_ident *, iddstlen); if (sah->identd == NULL) { KFREE(sah->idents); sah->idents = NULL; ipseclog((LOG_DEBUG, "key_setident: No more memory.\n")); return ENOBUFS; } memcpy(sah->idents, idsrc, idsrclen); memcpy(sah->identd, iddst, iddstlen); return 0; } /* * m will not be freed on return. * it is caller's responsibility to free the result. */ static struct mbuf * key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) { struct mbuf *n; /* sanity check */ if (m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_getmsgbuf_x1: NULL pointer is passed"); /* create new sadb_msg to reply. */ n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, SADB_EXT_SA, SADB_X_EXT_SA2, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); if (!n) return NULL; if (n->m_len < sizeof(struct sadb_msg)) { n = m_pullup(n, sizeof(struct sadb_msg)); if (n == NULL) return NULL; } mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; mtod(n, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); return n; } static int key_delete_all (struct socket *, struct mbuf *, const struct sadb_msghdr *, u_int16_t); /* * SADB_DELETE processing * receive * * from the ikmpd, and set SADB_SASTATE_DEAD, * and send, * * to the ikmpd. * * m will always be freed. */ static int key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_sa *sa0; struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *sah; struct secasvar *sav = NULL; u_int16_t proto; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_delete: NULL pointer is passed"); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_SA] == NULL) { /* * Caller wants us to delete all non-LARVAL SAs * that match the src/dst. This is used during * IKE INITIAL-CONTACT. */ ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n")); return key_delete_all(so, m, mhp, proto); } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); if ((error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* get a SA header */ LIST_FOREACH(sah, &sahtree, chain) { if (sah->state == SADB_SASTATE_DEAD) continue; if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) continue; /* get a SA with SPI. */ sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); if (sav) break; } if (sah == NULL) { ipseclog((LOG_DEBUG, "key_delete: no SA found.\n")); return key_senderror(so, m, ENOENT); } key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); { struct mbuf *n; struct sadb_msg *newmsg; /* create new sadb_msg to reply. */ n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); if (!n) return key_senderror(so, m, ENOBUFS); if (n->m_len < sizeof(struct sadb_msg)) { n = m_pullup(n, sizeof(struct sadb_msg)); if (n == NULL) return key_senderror(so, m, ENOBUFS); } newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * delete all SAs for src/dst. Called from key_delete(). */ static int key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, u_int16_t proto) { struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *sah; struct secasvar *sav, *nextsav; u_int stateidx, state; int error; src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); if ((error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); LIST_FOREACH(sah, &sahtree, chain) { if (sah->state == SADB_SASTATE_DEAD) continue; if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) continue; /* Delete all non-LARVAL SAs. */ for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive); stateidx++) { state = saorder_state_alive[stateidx]; if (state == SADB_SASTATE_LARVAL) continue; for (sav = LIST_FIRST(&sah->savtree[state]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); /* sanity check */ if (sav->state != state) { ipseclog((LOG_DEBUG, "key_delete_all: " "invalid sav->state " "(queue: %d SA: %d)\n", state, sav->state)); continue; } key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); } } } { struct mbuf *n; struct sadb_msg *newmsg; /* create new sadb_msg to reply. */ n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); if (!n) return key_senderror(so, m, ENOBUFS); if (n->m_len < sizeof(struct sadb_msg)) { n = m_pullup(n, sizeof(struct sadb_msg)); if (n == NULL) return key_senderror(so, m, ENOBUFS); } newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); } } /* * SADB_GET processing * receive * * from the ikmpd, and get a SP and a SA to respond, * and send, * * to the ikmpd. * * m will always be freed. */ static int key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_sa *sa0; struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *sah; struct secasvar *sav = NULL; u_int16_t proto; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_get: NULL pointer is passed"); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_SA] == NULL || mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; if ((error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* get a SA header */ LIST_FOREACH(sah, &sahtree, chain) { if (sah->state == SADB_SASTATE_DEAD) continue; if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) continue; /* get a SA with SPI. */ sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); if (sav) break; } if (sah == NULL) { ipseclog((LOG_DEBUG, "key_get: no SA found.\n")); return key_senderror(so, m, ENOENT); } { struct mbuf *n; u_int8_t satype; /* map proto to satype */ if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n")); return key_senderror(so, m, EINVAL); } /* create new sadb_msg to reply. */ n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, mhp->msg->sadb_msg_pid); if (!n) return key_senderror(so, m, ENOBUFS); m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); } } /* XXX make it sysctl-configurable? */ static void key_getcomb_setlifetime(struct sadb_comb *comb) { comb->sadb_comb_soft_allocations = 1; comb->sadb_comb_hard_allocations = 1; comb->sadb_comb_soft_bytes = 0; comb->sadb_comb_hard_bytes = 0; comb->sadb_comb_hard_addtime = 86400; /* 1 day */ comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; } /* * XXX reorder combinations by preference * XXX no idea if the user wants ESP authentication or not */ static struct mbuf * key_getcomb_esp(void) { struct sadb_comb *comb; struct enc_xform *algo; struct mbuf *result = NULL, *m, *n; int encmin; int i, off, o; int totlen; const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); m = NULL; for (i = 1; i <= SADB_EALG_MAX; i++) { algo = esp_algorithm_lookup(i); if (algo == NULL) continue; /* discard algorithms with key size smaller than system min */ if (_BITS(algo->maxkey) < ipsec_esp_keymin) continue; if (_BITS(algo->minkey) < ipsec_esp_keymin) encmin = ipsec_esp_keymin; else encmin = _BITS(algo->minkey); if (ipsec_esp_auth) m = key_getcomb_ah(); else { IPSEC_ASSERT(l <= MLEN, ("key_getcomb_esp: l=%u > MLEN=%lu", l, (u_long) MLEN)); MGET(m, M_DONTWAIT, MT_DATA); if (m) { M_ALIGN(m, l); m->m_len = l; m->m_next = NULL; memset(mtod(m, void *), 0, m->m_len); } } if (!m) goto fail; totlen = 0; for (n = m; n; n = n->m_next) totlen += n->m_len; IPSEC_ASSERT((totlen % l) == 0, ("key_getcomb_esp: totlen=%u, l=%u", totlen, l)); for (off = 0; off < totlen; off += l) { n = m_pulldown(m, off, l, &o); if (!n) { /* m is already freed */ goto fail; } comb = (struct sadb_comb *)(mtod(n, char *) + o); memset(comb, 0, sizeof(*comb)); key_getcomb_setlifetime(comb); comb->sadb_comb_encrypt = i; comb->sadb_comb_encrypt_minbits = encmin; comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); } if (!result) result = m; else m_cat(result, m); } return result; fail: if (result) m_freem(result); return NULL; } static void key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* ksmin, u_int16_t* ksmax) { *ksmin = *ksmax = ah->keysize; if (ah->keysize == 0) { /* * Transform takes arbitrary key size but algorithm * key size is restricted. Enforce this here. */ switch (alg) { case SADB_X_AALG_MD5: *ksmin = *ksmax = 16; break; case SADB_X_AALG_SHA: *ksmin = *ksmax = 20; break; case SADB_X_AALG_NULL: *ksmin = 1; *ksmax = 256; break; default: DPRINTF(("key_getsizes_ah: unknown AH algorithm %u\n", alg)); break; } } } /* * XXX reorder combinations by preference */ static struct mbuf * key_getcomb_ah(void) { struct sadb_comb *comb; struct auth_hash *algo; struct mbuf *m; u_int16_t minkeysize, maxkeysize; int i; const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); m = NULL; for (i = 1; i <= SADB_AALG_MAX; i++) { #if 1 /* we prefer HMAC algorithms, not old algorithms */ if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) continue; #endif algo = ah_algorithm_lookup(i); if (!algo) continue; key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); /* discard algorithms with key size smaller than system min */ if (_BITS(minkeysize) < ipsec_ah_keymin) continue; if (!m) { IPSEC_ASSERT(l <= MLEN, ("key_getcomb_ah: l=%u > MLEN=%lu", l, (u_long) MLEN)); MGET(m, M_DONTWAIT, MT_DATA); if (m) { M_ALIGN(m, l); m->m_len = l; m->m_next = NULL; } } else M_PREPEND(m, l, M_DONTWAIT); if (!m) return NULL; comb = mtod(m, struct sadb_comb *); memset(comb, 0, sizeof(*comb)); key_getcomb_setlifetime(comb); comb->sadb_comb_auth = i; comb->sadb_comb_auth_minbits = _BITS(minkeysize); comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); } return m; } /* * not really an official behavior. discussed in pf_key@inner.net in Sep2000. * XXX reorder combinations by preference */ static struct mbuf * key_getcomb_ipcomp(void) { struct sadb_comb *comb; struct comp_algo *algo; struct mbuf *m; int i; const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); m = NULL; for (i = 1; i <= SADB_X_CALG_MAX; i++) { algo = ipcomp_algorithm_lookup(i); if (!algo) continue; if (!m) { IPSEC_ASSERT(l <= MLEN, ("key_getcomb_ipcomp: l=%u > MLEN=%lu", l, (u_long) MLEN)); MGET(m, M_DONTWAIT, MT_DATA); if (m) { M_ALIGN(m, l); m->m_len = l; m->m_next = NULL; } } else M_PREPEND(m, l, M_DONTWAIT); if (!m) return NULL; comb = mtod(m, struct sadb_comb *); memset(comb, 0, sizeof(*comb)); key_getcomb_setlifetime(comb); comb->sadb_comb_encrypt = i; /* what should we set into sadb_comb_*_{min,max}bits? */ } return m; } /* * XXX no way to pass mode (transport/tunnel) to userland * XXX replay checking? * XXX sysctl interface to ipsec_{ah,esp}_keymin */ static struct mbuf * key_getprop(const struct secasindex *saidx) { struct sadb_prop *prop; struct mbuf *m, *n; const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); int totlen; switch (saidx->proto) { case IPPROTO_ESP: m = key_getcomb_esp(); break; case IPPROTO_AH: m = key_getcomb_ah(); break; case IPPROTO_IPCOMP: m = key_getcomb_ipcomp(); break; default: return NULL; } if (!m) return NULL; M_PREPEND(m, l, M_DONTWAIT); if (!m) return NULL; totlen = 0; for (n = m; n; n = n->m_next) totlen += n->m_len; prop = mtod(m, struct sadb_prop *); memset(prop, 0, sizeof(*prop)); prop->sadb_prop_len = PFKEY_UNIT64(totlen); prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; prop->sadb_prop_replay = 32; /* XXX */ return m; } /* * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). * send * * to KMD, and expect to receive * with SADB_ACQUIRE if error occurred, * or * with SADB_GETSPI * from KMD by PF_KEY. * * XXX x_policy is outside of RFC2367 (KAME extension). * XXX sensitivity is not supported. * XXX for ipcomp, RFC2367 does not define how to fill in proposal. * see comment for key_getcomb_ipcomp(). * * OUT: * 0 : succeed * others: error number */ static int key_acquire(const struct secasindex *saidx, struct secpolicy *sp) { struct mbuf *result = NULL, *m; #ifndef IPSEC_NONBLOCK_ACQUIRE struct secacq *newacq; #endif u_int8_t satype; int error = -1; u_int32_t seq; /* sanity check */ IPSEC_ASSERT(saidx != NULL, ("key_acquire: null saidx")); satype = key_proto2satype(saidx->proto); IPSEC_ASSERT(satype != 0, ("key_acquire: null satype, protocol %u", saidx->proto)); #ifndef IPSEC_NONBLOCK_ACQUIRE /* * We never do anything about acquirng SA. There is anather * solution that kernel blocks to send SADB_ACQUIRE message until * getting something message from IKEd. In later case, to be * managed with ACQUIRING list. */ /* Get an entry to check whether sending message or not. */ if ((newacq = key_getacq(saidx)) != NULL) { if (key_blockacq_count < newacq->count) { /* reset counter and do send message. */ newacq->count = 0; } else { /* increment counter and do nothing. */ newacq->count++; return 0; } } else { /* make new entry for blocking to send SADB_ACQUIRE. */ if ((newacq = key_newacq(saidx)) == NULL) return ENOBUFS; /* add to acqtree */ LIST_INSERT_HEAD(&acqtree, newacq, chain); } #endif #ifndef IPSEC_NONBLOCK_ACQUIRE seq = newacq->seq; #else seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); #endif m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); if (!m) { error = ENOBUFS; goto fail; } result = m; /* set sadb_address for saidx's. */ m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* XXX proxy address (optional) */ /* set sadb_x_policy */ if (sp) { m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); } /* XXX identity (optional) */ #if 0 if (idexttype && fqdn) { /* create identity extension (FQDN) */ struct sadb_ident *id; int fqdnlen; fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ id = (struct sadb_ident *)p; memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); id->sadb_ident_exttype = idexttype; id->sadb_ident_type = SADB_IDENTTYPE_FQDN; memcpy(id + 1, fqdn, fqdnlen); p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); } if (idexttype) { /* create identity extension (USERFQDN) */ struct sadb_ident *id; int userfqdnlen; if (userfqdn) { /* +1 for terminating-NUL */ userfqdnlen = strlen(userfqdn) + 1; } else userfqdnlen = 0; id = (struct sadb_ident *)p; memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); id->sadb_ident_exttype = idexttype; id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; /* XXX is it correct? */ if (curlwp) id->sadb_ident_id = kauth_cred_getuid(curlwp->l_cred); if (userfqdn && userfqdnlen) memcpy(id + 1, userfqdn, userfqdnlen); p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); } #endif /* XXX sensitivity (optional) */ /* create proposal/combination extension */ m = key_getprop(saidx); #if 0 /* * spec conformant: always attach proposal/combination extension, * the problem is that we have no way to attach it for ipcomp, * due to the way sadb_comb is declared in RFC2367. */ if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); #else /* * outside of spec; make proposal/combination extension optional. */ if (m) m_cat(result, m); #endif if ((result->m_flags & M_PKTHDR) == 0) { error = EINVAL; goto fail; } if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) { error = ENOBUFS; goto fail; } } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); fail: if (result) m_freem(result); return error; } #ifndef IPSEC_NONBLOCK_ACQUIRE static struct secacq * key_newacq(const struct secasindex *saidx) { struct secacq *newacq; /* get new entry */ KMALLOC(newacq, struct secacq *, sizeof(struct secacq)); if (newacq == NULL) { ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n")); return NULL; } memset(newacq, 0, sizeof(*newacq)); /* copy secindex */ memcpy(&newacq->saidx, saidx, sizeof(newacq->saidx)); newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq); newacq->created = time_second; newacq->count = 0; return newacq; } static struct secacq * key_getacq(const struct secasindex *saidx) { struct secacq *acq; LIST_FOREACH(acq, &acqtree, chain) { if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) return acq; } return NULL; } static struct secacq * key_getacqbyseq(u_int32_t seq) { struct secacq *acq; LIST_FOREACH(acq, &acqtree, chain) { if (acq->seq == seq) return acq; } return NULL; } #endif static struct secspacq * key_newspacq(struct secpolicyindex *spidx) { struct secspacq *acq; /* get new entry */ KMALLOC(acq, struct secspacq *, sizeof(struct secspacq)); if (acq == NULL) { ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n")); return NULL; } memset(acq, 0, sizeof(*acq)); /* copy secindex */ memcpy(&acq->spidx, spidx, sizeof(acq->spidx)); acq->created = time_second; acq->count = 0; return acq; } static struct secspacq * key_getspacq(struct secpolicyindex *spidx) { struct secspacq *acq; LIST_FOREACH(acq, &spacqtree, chain) { if (key_cmpspidx_exactly(spidx, &acq->spidx)) return acq; } return NULL; } /* * SADB_ACQUIRE processing, * in first situation, is receiving * * from the ikmpd, and clear sequence of its secasvar entry. * * In second situation, is receiving * * from a user land process, and return * * to the socket. * * m will always be freed. */ static int key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { const struct sadb_address *src0, *dst0; struct secasindex saidx; struct secashead *sah; u_int16_t proto; int error; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_acquire2: NULL pointer is passed"); /* * Error message from KMd. * We assume that if error was occurred in IKEd, the length of PFKEY * message is equal to the size of sadb_msg structure. * We do not raise error even if error occurred in this function. */ if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { #ifndef IPSEC_NONBLOCK_ACQUIRE struct secacq *acq; /* check sequence number */ if (mhp->msg->sadb_msg_seq == 0) { ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence number.\n")); m_freem(m); return 0; } if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { /* * the specified larval SA is already gone, or we got * a bogus sequence number. we can silently ignore it. */ m_freem(m); return 0; } /* reset acq counter in order to deletion by timehander. */ acq->created = time_second; acq->count = 0; #endif m_freem(m); return 0; } /* * This message is from user land. */ /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || mhp->ext[SADB_EXT_PROPOSAL] == NULL) { /* error */ ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { /* error */ ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n")); return key_senderror(so, m, EINVAL); } src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; if ((error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx)) != 0) return key_senderror(so, m, EINVAL); /* get a SA index */ LIST_FOREACH(sah, &sahtree, chain) { if (sah->state == SADB_SASTATE_DEAD) continue; if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) break; } if (sah != NULL) { ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n")); return key_senderror(so, m, EEXIST); } error = key_acquire(&saidx, NULL); if (error != 0) { ipseclog((LOG_DEBUG, "key_acquire2: error %d returned " "from key_acquire.\n", mhp->msg->sadb_msg_errno)); return key_senderror(so, m, error); } return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); } /* * SADB_REGISTER processing. * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. * receive * * from the ikmpd, and register a socket to send PF_KEY messages, * and send * * to KMD by PF_KEY. * If socket is detached, must free from regnode. * * m will always be freed. */ static int key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct secreg *reg, *newreg = 0; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_register: NULL pointer is passed"); /* check for invalid register message */ if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0])) return key_senderror(so, m, EINVAL); /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) goto setmsg; /* check whether existing or not */ LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) { if (reg->so == so) { ipseclog((LOG_DEBUG, "key_register: socket exists already.\n")); return key_senderror(so, m, EEXIST); } } /* create regnode */ KMALLOC(newreg, struct secreg *, sizeof(*newreg)); if (newreg == NULL) { ipseclog((LOG_DEBUG, "key_register: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } memset(newreg, 0, sizeof(*newreg)); newreg->so = so; ((struct keycb *)sotorawcb(so))->kp_registered++; /* add regnode to regtree. */ LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain); setmsg: { struct mbuf *n; struct sadb_msg *newmsg; struct sadb_supported *sup; u_int len, alen, elen; int off; int i; struct sadb_alg *alg; /* create new sadb_msg to reply. */ alen = 0; for (i = 1; i <= SADB_AALG_MAX; i++) { if (ah_algorithm_lookup(i)) alen += sizeof(struct sadb_alg); } if (alen) alen += sizeof(struct sadb_supported); elen = 0; for (i = 1; i <= SADB_EALG_MAX; i++) { if (esp_algorithm_lookup(i)) elen += sizeof(struct sadb_alg); } if (elen) elen += sizeof(struct sadb_supported); len = sizeof(struct sadb_msg) + alen + elen; if (len > MCLBYTES) return key_senderror(so, m, ENOBUFS); MGETHDR(n, M_DONTWAIT, MT_DATA); if (len > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_freem(n); n = NULL; } } if (!n) return key_senderror(so, m, ENOBUFS); n->m_pkthdr.len = n->m_len = len; n->m_next = NULL; off = 0; m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); newmsg = mtod(n, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(len); off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); /* for authentication algorithm */ if (alen) { sup = (struct sadb_supported *)(mtod(n, char *) + off); sup->sadb_supported_len = PFKEY_UNIT64(alen); sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; off += PFKEY_ALIGN8(sizeof(*sup)); for (i = 1; i <= SADB_AALG_MAX; i++) { struct auth_hash *aalgo; u_int16_t minkeysize, maxkeysize; aalgo = ah_algorithm_lookup(i); if (!aalgo) continue; alg = (struct sadb_alg *)(mtod(n, char *) + off); alg->sadb_alg_id = i; alg->sadb_alg_ivlen = 0; key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); alg->sadb_alg_minbits = _BITS(minkeysize); alg->sadb_alg_maxbits = _BITS(maxkeysize); off += PFKEY_ALIGN8(sizeof(*alg)); } } /* for encryption algorithm */ if (elen) { sup = (struct sadb_supported *)(mtod(n, char *) + off); sup->sadb_supported_len = PFKEY_UNIT64(elen); sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; off += PFKEY_ALIGN8(sizeof(*sup)); for (i = 1; i <= SADB_EALG_MAX; i++) { struct enc_xform *ealgo; ealgo = esp_algorithm_lookup(i); if (!ealgo) continue; alg = (struct sadb_alg *)(mtod(n, char *) + off); alg->sadb_alg_id = i; alg->sadb_alg_ivlen = ealgo->blocksize; alg->sadb_alg_minbits = _BITS(ealgo->minkey); alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); } } #ifdef DIAGNOSTIC if (off != len) panic("length assumption failed in key_register"); #endif m_freem(m); return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); } } /* * free secreg entry registered. * XXX: I want to do free a socket marked done SADB_RESIGER to socket. */ void key_freereg(struct socket *so) { struct secreg *reg; int i; /* sanity check */ if (so == NULL) panic("key_freereg: NULL pointer is passed"); /* * check whether existing or not. * check all type of SA, because there is a potential that * one socket is registered to multiple type of SA. */ for (i = 0; i <= SADB_SATYPE_MAX; i++) { LIST_FOREACH(reg, ®tree[i], chain) { if (reg->so == so && __LIST_CHAINED(reg)) { LIST_REMOVE(reg, chain); KFREE(reg); break; } } } return; } /* * SADB_EXPIRE processing * send * * to KMD by PF_KEY. * NOTE: We send only soft lifetime extension. * * OUT: 0 : succeed * others : error number */ static int key_expire(struct secasvar *sav) { int s; int satype; struct mbuf *result = NULL, *m; int len; int error = -1; struct sadb_lifetime *lt; /* XXX: Why do we lock ? */ s = splsoftnet(); /*called from softclock()*/ /* sanity check */ if (sav == NULL) panic("key_expire: NULL pointer is passed"); if (sav->sah == NULL) panic("key_expire: Why was SA index in SA NULL"); if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0) panic("key_expire: invalid proto is passed"); /* set msg header */ m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); if (!m) { error = ENOBUFS; goto fail; } result = m; /* create SA extension */ m = key_setsadbsa(sav); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* create SA extension */ m = key_setsadbxsa2(sav->sah->saidx.mode, sav->replay ? sav->replay->count : 0, sav->sah->saidx.reqid); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* create lifetime extension (current and soft) */ len = PFKEY_ALIGN8(sizeof(*lt)) * 2; m = key_alloc_mbuf(len); if (!m || m->m_next) { /*XXX*/ if (m) m_freem(m); error = ENOBUFS; goto fail; } memset(mtod(m, void *), 0, len); lt = mtod(m, struct sadb_lifetime *); lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations; lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes; lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime; lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime; lt = (struct sadb_lifetime *)(mtod(m, char *) + len / 2); memcpy(lt, sav->lft_s, sizeof(*lt)); m_cat(result, m); /* set sadb_address for source */ m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sav->sah->saidx.src.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); /* set sadb_address for destination */ m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sav->sah->saidx.dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); if (!m) { error = ENOBUFS; goto fail; } m_cat(result, m); if ((result->m_flags & M_PKTHDR) == 0) { error = EINVAL; goto fail; } if (result->m_len < sizeof(struct sadb_msg)) { result = m_pullup(result, sizeof(struct sadb_msg)); if (result == NULL) { error = ENOBUFS; goto fail; } } result->m_pkthdr.len = 0; for (m = result; m; m = m->m_next) result->m_pkthdr.len += m->m_len; mtod(result, struct sadb_msg *)->sadb_msg_len = PFKEY_UNIT64(result->m_pkthdr.len); splx(s); return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); fail: if (result) m_freem(result); splx(s); return error; } /* * SADB_FLUSH processing * receive * * from the ikmpd, and free all entries in secastree. * and send, * * to the ikmpd. * NOTE: to do is only marking SADB_SASTATE_DEAD. * * m will always be freed. */ static int key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { struct sadb_msg *newmsg; struct secashead *sah, *nextsah; struct secasvar *sav, *nextsav; u_int16_t proto; u_int8_t state; u_int stateidx; /* sanity check */ if (so == NULL || mhp == NULL || mhp->msg == NULL) panic("key_flush: NULL pointer is passed"); /* map satype to proto */ if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n")); return key_senderror(so, m, EINVAL); } /* no SATYPE specified, i.e. flushing all SA. */ for (sah = LIST_FIRST(&sahtree); sah != NULL; sah = nextsah) { nextsah = LIST_NEXT(sah, chain); if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC && proto != sah->saidx.proto) continue; for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive); stateidx++) { state = saorder_state_any[stateidx]; for (sav = LIST_FIRST(&sah->savtree[state]); sav != NULL; sav = nextsav) { nextsav = LIST_NEXT(sav, chain); key_sa_chgstate(sav, SADB_SASTATE_DEAD); KEY_FREESAV(&sav); } } sah->state = SADB_SASTATE_DEAD; } if (m->m_len < sizeof(struct sadb_msg) || sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { ipseclog((LOG_DEBUG, "key_flush: No more memory.\n")); return key_senderror(so, m, ENOBUFS); } if (m->m_next) m_freem(m->m_next); m->m_next = NULL; m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); newmsg = mtod(m, struct sadb_msg *); newmsg->sadb_msg_errno = 0; newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); } static struct mbuf * key_setdump_chain(u_int8_t req_satype, int *errorp, int *lenp, pid_t pid) { struct secashead *sah; struct secasvar *sav; u_int16_t proto; u_int stateidx; u_int8_t satype; u_int8_t state; int cnt; struct mbuf *m, *n, *prev; int totlen; *lenp = 0; /* map satype to proto */ if ((proto = key_satype2proto(req_satype)) == 0) { *errorp = EINVAL; return (NULL); } /* count sav entries to be sent to userland. */ cnt = 0; LIST_FOREACH(sah, &sahtree, chain) { if (req_satype != SADB_SATYPE_UNSPEC && proto != sah->saidx.proto) continue; for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any); stateidx++) { state = saorder_state_any[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { cnt++; } } } if (cnt == 0) { *errorp = ENOENT; return (NULL); } /* send this to the userland, one at a time. */ m = NULL; prev = m; LIST_FOREACH(sah, &sahtree, chain) { if (req_satype != SADB_SATYPE_UNSPEC && proto != sah->saidx.proto) continue; /* map proto to satype */ if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { m_freem(m); *errorp = EINVAL; return (NULL); } for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any); stateidx++) { state = saorder_state_any[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { n = key_setdumpsa(sav, SADB_DUMP, satype, --cnt, pid); if (!n) { m_freem(m); *errorp = ENOBUFS; return (NULL); } totlen += n->m_pkthdr.len; if (!m) m = n; else prev->m_nextpkt = n; prev = n; } } } if (!m) { *errorp = EINVAL; return (NULL); } if ((m->m_flags & M_PKTHDR) != 0) { m->m_pkthdr.len = 0; for (n = m; n; n = n->m_next) m->m_pkthdr.len += n->m_len; } *errorp = 0; return (m); } /* * SADB_DUMP processing * dump all entries including status of DEAD in SAD. * receive * * from the ikmpd, and dump all secasvar leaves * and send, * ..... * to the ikmpd. * * m will always be freed. */ static int key_dump(struct socket *so, struct mbuf *m0, const struct sadb_msghdr *mhp) { u_int16_t proto; u_int8_t satype; struct mbuf *n; int s; int error, len, ok; /* sanity check */ if (so == NULL || m0 == NULL || mhp == NULL || mhp->msg == NULL) panic("key_dump: NULL pointer is passed"); /* map satype to proto */ satype = mhp->msg->sadb_msg_satype; if ((proto = key_satype2proto(satype)) == 0) { ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n")); return key_senderror(so, m0, EINVAL); } /* * If the requestor has insufficient socket-buffer space * for the entire chain, nobody gets any response to the DUMP. * XXX For now, only the requestor ever gets anything. * Moreover, if the requestor has any space at all, they receive * the entire chain, otherwise the request is refused with ENOBUFS. */ if (sbspace(&so->so_rcv) <= 0) { return key_senderror(so, m0, ENOBUFS); } s = splsoftnet(); n = key_setdump_chain(satype, &error, &len, mhp->msg->sadb_msg_pid); splx(s); if (n == NULL) { return key_senderror(so, m0, ENOENT); } { uint64_t *ps = PFKEY_STAT_GETREF(); ps[PFKEY_STAT_IN_TOTAL]++; ps[PFKEY_STAT_IN_BYTES] += len; PFKEY_STAT_PUTREF(); } /* * PF_KEY DUMP responses are no longer broadcast to all PF_KEY sockets. * The requestor receives either the entire chain, or an * error message with ENOBUFS. * * sbappendaddrchain() takes the chain of entries, one * packet-record per SPD entry, prepends the key_src sockaddr * to each packet-record, links the sockaddr mbufs into a new * list of records, then appends the entire resulting * list to the requesting socket. */ ok = sbappendaddrchain(&so->so_rcv, (struct sockaddr *)&key_src, n, SB_PRIO_ONESHOT_OVERFLOW); if (!ok) { PFKEY_STATINC(PFKEY_STAT_IN_NOMEM); m_freem(n); return key_senderror(so, m0, ENOBUFS); } m_freem(m0); return 0; } /* * SADB_X_PROMISC processing * * m will always be freed. */ static int key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) { int olen; /* sanity check */ if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL) panic("key_promisc: NULL pointer is passed"); olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); if (olen < sizeof(struct sadb_msg)) { #if 1 return key_senderror(so, m, EINVAL); #else m_freem(m); return 0; #endif } else if (olen == sizeof(struct sadb_msg)) { /* enable/disable promisc mode */ struct keycb *kp; if ((kp = (struct keycb *)sotorawcb(so)) == NULL) return key_senderror(so, m, EINVAL); mhp->msg->sadb_msg_errno = 0; switch (mhp->msg->sadb_msg_satype) { case 0: case 1: kp->kp_promisc = mhp->msg->sadb_msg_satype; break; default: return key_senderror(so, m, EINVAL); } /* send the original message back to everyone */ mhp->msg->sadb_msg_errno = 0; return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); } else { /* send packet as is */ m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); /* TODO: if sadb_msg_seq is specified, send to specific pid */ return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); } } static int (*key_typesw[]) (struct socket *, struct mbuf *, const struct sadb_msghdr *) = { NULL, /* SADB_RESERVED */ key_getspi, /* SADB_GETSPI */ key_update, /* SADB_UPDATE */ key_add, /* SADB_ADD */ key_delete, /* SADB_DELETE */ key_get, /* SADB_GET */ key_acquire2, /* SADB_ACQUIRE */ key_register, /* SADB_REGISTER */ NULL, /* SADB_EXPIRE */ key_flush, /* SADB_FLUSH */ key_dump, /* SADB_DUMP */ key_promisc, /* SADB_X_PROMISC */ NULL, /* SADB_X_PCHANGE */ key_spdadd, /* SADB_X_SPDUPDATE */ key_spdadd, /* SADB_X_SPDADD */ key_spddelete, /* SADB_X_SPDDELETE */ key_spdget, /* SADB_X_SPDGET */ NULL, /* SADB_X_SPDACQUIRE */ key_spddump, /* SADB_X_SPDDUMP */ key_spdflush, /* SADB_X_SPDFLUSH */ key_spdadd, /* SADB_X_SPDSETIDX */ NULL, /* SADB_X_SPDEXPIRE */ key_spddelete2, /* SADB_X_SPDDELETE2 */ #ifdef IPSEC_NAT_T key_nat_map, /* SADB_X_NAT_T_NEW_MAPPING */ #endif }; /* * parse sadb_msg buffer to process PFKEYv2, * and create a data to response if needed. * I think to be dealed with mbuf directly. * IN: * msgp : pointer to pointer to a received buffer pulluped. * This is rewrited to response. * so : pointer to socket. * OUT: * length for buffer to send to user process. */ int key_parse(struct mbuf *m, struct socket *so) { struct sadb_msg *msg; struct sadb_msghdr mh; u_int orglen; int error; int target; /* sanity check */ if (m == NULL || so == NULL) panic("key_parse: NULL pointer is passed"); #if 0 /*kdebug_sadb assumes msg in linear buffer*/ KEYDEBUG(KEYDEBUG_KEY_DUMP, ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n")); kdebug_sadb(msg)); #endif if (m->m_len < sizeof(struct sadb_msg)) { m = m_pullup(m, sizeof(struct sadb_msg)); if (!m) return ENOBUFS; } msg = mtod(m, struct sadb_msg *); orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); target = KEY_SENDUP_ONE; if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len != m->m_pkthdr.len) { ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); error = EINVAL; goto senderror; } if (msg->sadb_msg_version != PF_KEY_V2) { ipseclog((LOG_DEBUG, "key_parse: PF_KEY version %u is mismatched.\n", msg->sadb_msg_version)); PFKEY_STATINC(PFKEY_STAT_OUT_INVVER); error = EINVAL; goto senderror; } if (msg->sadb_msg_type > SADB_MAX) { ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n", msg->sadb_msg_type)); PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); error = EINVAL; goto senderror; } /* for old-fashioned code - should be nuked */ if (m->m_pkthdr.len > MCLBYTES) { m_freem(m); return ENOBUFS; } if (m->m_next) { struct mbuf *n; MGETHDR(n, M_DONTWAIT, MT_DATA); if (n && m->m_pkthdr.len > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_free(n); n = NULL; } } if (!n) { m_freem(m); return ENOBUFS; } m_copydata(m, 0, m->m_pkthdr.len, mtod(n, void *)); n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; n->m_next = NULL; m_freem(m); m = n; } /* align the mbuf chain so that extensions are in contiguous region. */ error = key_align(m, &mh); if (error) return error; if (m->m_next) { /*XXX*/ m_freem(m); return ENOBUFS; } msg = mh.msg; /* check SA type */ switch (msg->sadb_msg_satype) { case SADB_SATYPE_UNSPEC: switch (msg->sadb_msg_type) { case SADB_GETSPI: case SADB_UPDATE: case SADB_ADD: case SADB_DELETE: case SADB_GET: case SADB_ACQUIRE: case SADB_EXPIRE: ipseclog((LOG_DEBUG, "key_parse: must specify satype " "when msg type=%u.\n", msg->sadb_msg_type)); PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); error = EINVAL; goto senderror; } break; case SADB_SATYPE_AH: case SADB_SATYPE_ESP: case SADB_X_SATYPE_IPCOMP: case SADB_X_SATYPE_TCPSIGNATURE: switch (msg->sadb_msg_type) { case SADB_X_SPDADD: case SADB_X_SPDDELETE: case SADB_X_SPDGET: case SADB_X_SPDDUMP: case SADB_X_SPDFLUSH: case SADB_X_SPDSETIDX: case SADB_X_SPDUPDATE: case SADB_X_SPDDELETE2: ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n", msg->sadb_msg_type)); PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); error = EINVAL; goto senderror; } break; case SADB_SATYPE_RSVP: case SADB_SATYPE_OSPFV2: case SADB_SATYPE_RIPV2: case SADB_SATYPE_MIP: ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n", msg->sadb_msg_satype)); PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); error = EOPNOTSUPP; goto senderror; case 1: /* XXX: What does it do? */ if (msg->sadb_msg_type == SADB_X_PROMISC) break; /*FALLTHROUGH*/ default: ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n", msg->sadb_msg_satype)); PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); error = EINVAL; goto senderror; } /* check field of upper layer protocol and address family */ if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { struct sadb_address *src0, *dst0; u_int plen; src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); /* check upper layer protocol */ if (src0->sadb_address_proto != dst0->sadb_address_proto) { ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } /* check family */ if (PFKEY_ADDR_SADDR(src0)->sa_family != PFKEY_ADDR_SADDR(dst0)->sa_family) { ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } if (PFKEY_ADDR_SADDR(src0)->sa_len != PFKEY_ADDR_SADDR(dst0)->sa_len) { ipseclog((LOG_DEBUG, "key_parse: address struct size mismatched.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } switch (PFKEY_ADDR_SADDR(src0)->sa_family) { case AF_INET: if (PFKEY_ADDR_SADDR(src0)->sa_len != sizeof(struct sockaddr_in)) { PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } break; case AF_INET6: if (PFKEY_ADDR_SADDR(src0)->sa_len != sizeof(struct sockaddr_in6)) { PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } break; default: ipseclog((LOG_DEBUG, "key_parse: unsupported address family.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EAFNOSUPPORT; goto senderror; } switch (PFKEY_ADDR_SADDR(src0)->sa_family) { case AF_INET: plen = sizeof(struct in_addr) << 3; break; case AF_INET6: plen = sizeof(struct in6_addr) << 3; break; default: plen = 0; /*fool gcc*/ break; } /* check max prefix length */ if (src0->sadb_address_prefixlen > plen || dst0->sadb_address_prefixlen > plen) { ipseclog((LOG_DEBUG, "key_parse: illegal prefixlen.\n")); PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); error = EINVAL; goto senderror; } /* * prefixlen == 0 is valid because there can be a case when * all addresses are matched. */ } if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || key_typesw[msg->sadb_msg_type] == NULL) { PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); error = EINVAL; goto senderror; } return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); senderror: msg->sadb_msg_errno = error; return key_sendup_mbuf(so, m, target); } static int key_senderror(struct socket *so, struct mbuf *m, int code) { struct sadb_msg *msg; if (m->m_len < sizeof(struct sadb_msg)) panic("invalid mbuf passed to key_senderror"); msg = mtod(m, struct sadb_msg *); msg->sadb_msg_errno = code; return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); } /* * set the pointer to each header into message buffer. * m will be freed on error. * XXX larger-than-MCLBYTES extension? */ static int key_align(struct mbuf *m, struct sadb_msghdr *mhp) { struct mbuf *n; struct sadb_ext *ext; size_t off, end; int extlen; int toff; /* sanity check */ if (m == NULL || mhp == NULL) panic("key_align: NULL pointer is passed"); if (m->m_len < sizeof(struct sadb_msg)) panic("invalid mbuf passed to key_align"); /* initialize */ memset(mhp, 0, sizeof(*mhp)); mhp->msg = mtod(m, struct sadb_msg *); mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); extlen = end; /*just in case extlen is not updated*/ for (off = sizeof(struct sadb_msg); off < end; off += extlen) { n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); if (!n) { /* m is already freed */ return ENOBUFS; } ext = (struct sadb_ext *)(mtod(n, char *) + toff); /* set pointer */ switch (ext->sadb_ext_type) { case SADB_EXT_SA: case SADB_EXT_ADDRESS_SRC: case SADB_EXT_ADDRESS_DST: case SADB_EXT_ADDRESS_PROXY: case SADB_EXT_LIFETIME_CURRENT: case SADB_EXT_LIFETIME_HARD: case SADB_EXT_LIFETIME_SOFT: case SADB_EXT_KEY_AUTH: case SADB_EXT_KEY_ENCRYPT: case SADB_EXT_IDENTITY_SRC: case SADB_EXT_IDENTITY_DST: case SADB_EXT_SENSITIVITY: case SADB_EXT_PROPOSAL: case SADB_EXT_SUPPORTED_AUTH: case SADB_EXT_SUPPORTED_ENCRYPT: case SADB_EXT_SPIRANGE: case SADB_X_EXT_POLICY: case SADB_X_EXT_SA2: #ifdef IPSEC_NAT_T case SADB_X_EXT_NAT_T_TYPE: case SADB_X_EXT_NAT_T_SPORT: case SADB_X_EXT_NAT_T_DPORT: case SADB_X_EXT_NAT_T_OA: case SADB_X_EXT_NAT_T_FRAG: #endif /* duplicate check */ /* * XXX Are there duplication payloads of either * KEY_AUTH or KEY_ENCRYPT ? */ if (mhp->ext[ext->sadb_ext_type] != NULL) { ipseclog((LOG_DEBUG, "key_align: duplicate ext_type %u " "is passed.\n", ext->sadb_ext_type)); m_freem(m); PFKEY_STATINC(PFKEY_STAT_OUT_DUPEXT); return EINVAL; } break; default: ipseclog((LOG_DEBUG, "key_align: invalid ext_type %u is passed.\n", ext->sadb_ext_type)); m_freem(m); PFKEY_STATINC(PFKEY_STAT_OUT_INVEXTTYPE); return EINVAL; } extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); if (key_validate_ext(ext, extlen)) { m_freem(m); PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); return EINVAL; } n = m_pulldown(m, off, extlen, &toff); if (!n) { /* m is already freed */ return ENOBUFS; } ext = (struct sadb_ext *)(mtod(n, char *) + toff); mhp->ext[ext->sadb_ext_type] = ext; mhp->extoff[ext->sadb_ext_type] = off; mhp->extlen[ext->sadb_ext_type] = extlen; } if (off != end) { m_freem(m); PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); return EINVAL; } return 0; } static int key_validate_ext(const struct sadb_ext *ext, int len) { const struct sockaddr *sa; enum { NONE, ADDR } checktype = NONE; int baselen = 0; const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) return EINVAL; /* if it does not match minimum/maximum length, bail */ if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) return EINVAL; if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) return EINVAL; if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) return EINVAL; /* more checks based on sadb_ext_type XXX need more */ switch (ext->sadb_ext_type) { case SADB_EXT_ADDRESS_SRC: case SADB_EXT_ADDRESS_DST: case SADB_EXT_ADDRESS_PROXY: baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); checktype = ADDR; break; case SADB_EXT_IDENTITY_SRC: case SADB_EXT_IDENTITY_DST: if (((const struct sadb_ident *)ext)->sadb_ident_type == SADB_X_IDENTTYPE_ADDR) { baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); checktype = ADDR; } else checktype = NONE; break; default: checktype = NONE; break; } switch (checktype) { case NONE: break; case ADDR: sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); if (len < baselen + sal) return EINVAL; if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) return EINVAL; break; } return 0; } static int key_do_init(void) { int i; pfkeystat_percpu = percpu_alloc(sizeof(uint64_t) * PFKEY_NSTATS); callout_init(&key_timehandler_ch, 0); for (i = 0; i < IPSEC_DIR_MAX; i++) { LIST_INIT(&sptree[i]); } LIST_INIT(&sahtree); for (i = 0; i <= SADB_SATYPE_MAX; i++) { LIST_INIT(®tree[i]); } #ifndef IPSEC_NONBLOCK_ACQUIRE LIST_INIT(&acqtree); #endif LIST_INIT(&spacqtree); /* system default */ ip4_def_policy.policy = IPSEC_POLICY_NONE; ip4_def_policy.refcnt++; /*never reclaim this*/ #ifdef INET6 ip6_def_policy.policy = IPSEC_POLICY_NONE; ip6_def_policy.refcnt++; /*never reclaim this*/ #endif #ifndef IPSEC_DEBUG2 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); #endif /*IPSEC_DEBUG2*/ /* initialize key statistics */ keystat.getspi_count = 1; aprint_verbose("IPsec: Initialized Security Association Processing.\n"); return (0); } void key_init(void) { static ONCE_DECL(key_init_once); RUN_ONCE(&key_init_once, key_do_init); } /* * XXX: maybe This function is called after INBOUND IPsec processing. * * Special check for tunnel-mode packets. * We must make some checks for consistency between inner and outer IP header. * * xxx more checks to be provided */ int key_checktunnelsanity( struct secasvar *sav, u_int family, void *src, void *dst ) { /* sanity check */ if (sav->sah == NULL) panic("sav->sah == NULL at key_checktunnelsanity"); /* XXX: check inner IP header */ return 1; } #if 0 #define hostnamelen strlen(hostname) /* * Get FQDN for the host. * If the administrator configured hostname (by hostname(1)) without * domain name, returns nothing. */ static const char * key_getfqdn(void) { int i; int hasdot; static char fqdn[MAXHOSTNAMELEN + 1]; if (!hostnamelen) return NULL; /* check if it comes with domain name. */ hasdot = 0; for (i = 0; i < hostnamelen; i++) { if (hostname[i] == '.') hasdot++; } if (!hasdot) return NULL; /* NOTE: hostname may not be NUL-terminated. */ memset(fqdn, 0, sizeof(fqdn)); memcpy(fqdn, hostname, hostnamelen); fqdn[hostnamelen] = '\0'; return fqdn; } /* * get username@FQDN for the host/user. */ static const char * key_getuserfqdn(void) { const char *host; static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2]; struct proc *p = curproc; char *q; if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) return NULL; if (!(host = key_getfqdn())) return NULL; /* NOTE: s_login may not be-NUL terminated. */ memset(userfqdn, 0, sizeof(userfqdn)); memcpy(userfqdn, Mp->p_pgrp->pg_session->s_login, AXLOGNAME); userfqdn[MAXLOGNAME] = '\0'; /* safeguard */ q = userfqdn + strlen(userfqdn); *q++ = '@'; memcpy(q, host, strlen(host)); q += strlen(host); *q++ = '\0'; return userfqdn; } #endif /* record data transfer on SA, and update timestamps */ void key_sa_recordxfer(struct secasvar *sav, struct mbuf *m) { IPSEC_ASSERT(sav != NULL, ("key_sa_recordxfer: Null secasvar")); IPSEC_ASSERT(m != NULL, ("key_sa_recordxfer: Null mbuf")); if (!sav->lft_c) return; /* * XXX Currently, there is a difference of bytes size * between inbound and outbound processing. */ sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len; /* to check bytes lifetime is done in key_timehandler(). */ /* * We use the number of packets as the unit of * sadb_lifetime_allocations. We increment the variable * whenever {esp,ah}_{in,out}put is called. */ sav->lft_c->sadb_lifetime_allocations++; /* XXX check for expires? */ /* * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock, * in seconds. HARD and SOFT lifetime are measured by the time * difference (again in seconds) from sadb_lifetime_usetime. * * usetime * v expire expire * -----+-----+--------+---> t * <--------------> HARD * <-----> SOFT */ sav->lft_c->sadb_lifetime_usetime = time_second; /* XXX check for expires? */ return; } /* dumb version */ void key_sa_routechange(struct sockaddr *dst) { struct secashead *sah; struct route *ro; const struct sockaddr *sa; LIST_FOREACH(sah, &sahtree, chain) { ro = &sah->sa_route; sa = rtcache_getdst(ro); if (sa != NULL && dst->sa_len == sa->sa_len && memcmp(dst, sa, dst->sa_len) == 0) rtcache_free(ro); } return; } static void key_sa_chgstate(struct secasvar *sav, u_int8_t state) { if (sav == NULL) panic("key_sa_chgstate called with sav == NULL"); if (sav->state == state) return; if (__LIST_CHAINED(sav)) LIST_REMOVE(sav, chain); sav->state = state; LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); } void key_sa_stir_iv(struct secasvar *sav) { if (!sav->iv) panic("key_sa_stir_iv called with sav == NULL"); key_randomfill(sav->iv, sav->ivlen); } /* XXX too much? */ static struct mbuf * key_alloc_mbuf(int l) { struct mbuf *m = NULL, *n; int len, t; len = l; while (len > 0) { MGET(n, M_DONTWAIT, MT_DATA); if (n && len > MLEN) MCLGET(n, M_DONTWAIT); if (!n) { m_freem(m); return NULL; } n->m_next = NULL; n->m_len = 0; n->m_len = M_TRAILINGSPACE(n); /* use the bottom of mbuf, hoping we can prepend afterwards */ if (n->m_len > len) { t = (n->m_len - len) & ~(sizeof(long) - 1); n->m_data += t; n->m_len = len; } len -= n->m_len; if (m) m_cat(m, n); else m = n; } return m; } static struct mbuf * key_setdump(u_int8_t req_satype, int *errorp, uint32_t pid) { struct secashead *sah; struct secasvar *sav; u_int16_t proto; u_int stateidx; u_int8_t satype; u_int8_t state; int cnt; struct mbuf *m, *n; /* map satype to proto */ if ((proto = key_satype2proto(req_satype)) == 0) { *errorp = EINVAL; return (NULL); } /* count sav entries to be sent to the userland. */ cnt = 0; LIST_FOREACH(sah, &sahtree, chain) { if (req_satype != SADB_SATYPE_UNSPEC && proto != sah->saidx.proto) continue; for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any); stateidx++) { state = saorder_state_any[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { cnt++; } } } if (cnt == 0) { *errorp = ENOENT; return (NULL); } /* send this to the userland, one at a time. */ m = NULL; LIST_FOREACH(sah, &sahtree, chain) { if (req_satype != SADB_SATYPE_UNSPEC && proto != sah->saidx.proto) continue; /* map proto to satype */ if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { m_freem(m); *errorp = EINVAL; return (NULL); } for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any); stateidx++) { state = saorder_state_any[stateidx]; LIST_FOREACH(sav, &sah->savtree[state], chain) { n = key_setdumpsa(sav, SADB_DUMP, satype, --cnt, pid); if (!n) { m_freem(m); *errorp = ENOBUFS; return (NULL); } if (!m) m = n; else m_cat(m, n); } } } if (!m) { *errorp = EINVAL; return (NULL); } if ((m->m_flags & M_PKTHDR) != 0) { m->m_pkthdr.len = 0; for (n = m; n; n = n->m_next) m->m_pkthdr.len += n->m_len; } *errorp = 0; return (m); } static struct mbuf * key_setspddump(int *errorp, pid_t pid) { struct secpolicy *sp; int cnt; u_int dir; struct mbuf *m, *n; /* search SPD entry and get buffer size. */ cnt = 0; for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { LIST_FOREACH(sp, &sptree[dir], chain) { cnt++; } } if (cnt == 0) { *errorp = ENOENT; return (NULL); } m = NULL; for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { LIST_FOREACH(sp, &sptree[dir], chain) { --cnt; n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, pid); if (!n) { *errorp = ENOBUFS; m_freem(m); return (NULL); } if (!m) m = n; else { m->m_pkthdr.len += n->m_pkthdr.len; m_cat(m, n); } } } *errorp = 0; return (m); } static int sysctl_net_key_dumpsa(SYSCTLFN_ARGS) { struct mbuf *m, *n; int err2 = 0; char *p, *ep; size_t len; int s, error; if (newp) return (EPERM); if (namelen != 1) return (EINVAL); s = splsoftnet(); m = key_setdump(name[0], &error, l->l_proc->p_pid); splx(s); if (!m) return (error); if (!oldp) *oldlenp = m->m_pkthdr.len; else { p = oldp; if (*oldlenp < m->m_pkthdr.len) { err2 = ENOMEM; ep = p + *oldlenp; } else { *oldlenp = m->m_pkthdr.len; ep = p + m->m_pkthdr.len; } for (n = m; n; n = n->m_next) { len = (ep - p < n->m_len) ? ep - p : n->m_len; error = copyout(mtod(n, const void *), p, len); p += len; if (error) break; } if (error == 0) error = err2; } m_freem(m); return (error); } static int sysctl_net_key_dumpsp(SYSCTLFN_ARGS) { struct mbuf *m, *n; int err2 = 0; char *p, *ep; size_t len; int s, error; if (newp) return (EPERM); if (namelen != 0) return (EINVAL); s = splsoftnet(); m = key_setspddump(&error, l->l_proc->p_pid); splx(s); if (!m) return (error); if (!oldp) *oldlenp = m->m_pkthdr.len; else { p = oldp; if (*oldlenp < m->m_pkthdr.len) { err2 = ENOMEM; ep = p + *oldlenp; } else { *oldlenp = m->m_pkthdr.len; ep = p + m->m_pkthdr.len; } for (n = m; n; n = n->m_next) { len = (ep - p < n->m_len) ? ep - p : n->m_len; error = copyout(mtod(n, const void *), p, len); p += len; if (error) break; } if (error == 0) error = err2; } m_freem(m); return (error); } /* * Create sysctl tree for native FAST_IPSEC key knobs, originally * under name "net.keyv2" * with MIB number { CTL_NET, PF_KEY_V2. }. * However, sysctl(8) never checked for nodes under { CTL_NET, PF_KEY_V2 }; * and in any case the part of our sysctl namespace used for dumping the * SPD and SA database *HAS* to be compatible with the KAME sysctl * namespace, for API reasons. * * Pending a consensus on the right way to fix this, add a level of * indirection in how we number the `native' FAST_IPSEC key nodes; * and (as requested by Andrew Brown) move registration of the * KAME-compatible names to a separate function. */ #if 0 # define FAST_IPSEC_PFKEY PF_KEY_V2 # define FAST_IPSEC_PFKEY_NAME "keyv2" #else # define FAST_IPSEC_PFKEY PF_KEY # define FAST_IPSEC_PFKEY_NAME "key" #endif static int sysctl_net_key_stats(SYSCTLFN_ARGS) { return (NETSTAT_SYSCTL(pfkeystat_percpu, PFKEY_NSTATS)); } SYSCTL_SETUP(sysctl_net_keyv2_setup, "sysctl net.keyv2 subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, NULL, 0, NULL, 0, CTL_NET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, FAST_IPSEC_PFKEY_NAME, NULL, NULL, 0, NULL, 0, CTL_NET, FAST_IPSEC_PFKEY, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "debug", NULL, NULL, 0, &key_debug_level, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_DEBUG_LEVEL, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "spi_try", NULL, NULL, 0, &key_spi_trycnt, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_SPI_TRY, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "spi_min_value", NULL, NULL, 0, &key_spi_minval, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_SPI_MIN_VALUE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "spi_max_value", NULL, NULL, 0, &key_spi_maxval, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_SPI_MAX_VALUE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "random_int", NULL, NULL, 0, &key_int_random, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_RANDOM_INT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "larval_lifetime", NULL, NULL, 0, &key_larval_lifetime, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_LARVAL_LIFETIME, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "blockacq_count", NULL, NULL, 0, &key_blockacq_count, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_BLOCKACQ_COUNT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "blockacq_lifetime", NULL, NULL, 0, &key_blockacq_lifetime, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_BLOCKACQ_LIFETIME, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "esp_keymin", NULL, NULL, 0, &ipsec_esp_keymin, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_ESP_KEYMIN, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "prefered_oldsa", NULL, NULL, 0, &key_prefered_oldsa, 0, CTL_NET, PF_KEY, KEYCTL_PREFERED_OLDSA, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "esp_auth", NULL, NULL, 0, &ipsec_esp_auth, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_ESP_AUTH, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ah_keymin", NULL, NULL, 0, &ipsec_ah_keymin, 0, CTL_NET, FAST_IPSEC_PFKEY, KEYCTL_AH_KEYMIN, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "stats", SYSCTL_DESCR("PF_KEY statistics"), sysctl_net_key_stats, 0, NULL, 0, CTL_NET, FAST_IPSEC_PFKEY, CTL_CREATE, CTL_EOL); } /* * Register sysctl names used by setkey(8). For historical reasons, * and to share a single API, these names appear under { CTL_NET, PF_KEY } * for both FAST_IPSEC and KAME IPSEC. */ SYSCTL_SETUP(sysctl_net_key_compat_setup, "sysctl net.key subtree setup for FAST_IPSEC") { /* Make sure net.key exists before we register nodes underneath it. */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, NULL, 0, NULL, 0, CTL_NET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "key", NULL, NULL, 0, NULL, 0, CTL_NET, PF_KEY, CTL_EOL); /* Register the net.key.dump{sa,sp} nodes used by setkey(8). */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "dumpsa", NULL, sysctl_net_key_dumpsa, 0, NULL, 0, CTL_NET, PF_KEY, KEYCTL_DUMPSA, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "dumpsp", NULL, sysctl_net_key_dumpsp, 0, NULL, 0, CTL_NET, PF_KEY, KEYCTL_DUMPSP, CTL_EOL); }