/* $KAME: isakmp_inf.c,v 1.81 2002/04/15 01:58:37 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #ifdef IPV6_INRIA_VERSION #include #include #else #include #endif #include #include #include #include #if TIME_WITH_SYS_TIME # include # include #else # if HAVE_SYS_TIME_H # include # else # include # endif #endif #include "libpfkey.h" #include "var.h" #include "vmbuf.h" #include "schedule.h" #include "str2val.h" #include "misc.h" #include "plog.h" #include "debug.h" #include "localconf.h" #include "remoteconf.h" #include "sockmisc.h" #include "isakmp_var.h" #include "isakmp.h" #include "isakmp_inf.h" #include "oakley.h" #include "handler.h" #include "ipsec_doi.h" #include "crypto_openssl.h" #include "pfkey.h" #include "policy.h" #include "algorithm.h" #include "proposal.h" #include "admin.h" #include "strnames.h" /* information exchange */ static int isakmp_info_recv_n __P((struct ph1handle *, vchar_t *)); static int isakmp_info_recv_d __P((struct ph1handle *, vchar_t *)); static void purge_isakmp_spi __P((int, isakmp_index *, size_t)); static void purge_ipsec_spi __P((struct sockaddr *, int, u_int32_t *, size_t)); static void info_recv_initialcontact __P((struct ph1handle *)); /* %%% * Information Exchange */ /* * receive Information */ int isakmp_info_recv(iph1, msg0) struct ph1handle *iph1; vchar_t *msg0; { vchar_t *msg = NULL; int error = -1; struct isakmp *isakmp; struct isakmp_gen *gen; u_int8_t np; int encrypted; plog(LLV_DEBUG, LOCATION, NULL, "receive Information.\n"); encrypted = ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E); /* Use new IV to decrypt Informational message. */ if (encrypted) { struct isakmp_ivm *ivm; /* compute IV */ ivm = oakley_newiv2(iph1, ((struct isakmp *)msg0->v)->msgid); if (ivm == NULL) return -1; msg = oakley_do_decrypt(iph1, msg0, ivm->iv, ivm->ive); oakley_delivm(ivm); if (msg == NULL) return -1; } else msg = vdup(msg0); isakmp = (struct isakmp *)msg->v; gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp)); if (isakmp->np != ISAKMP_NPTYPE_HASH) { plog(LLV_ERROR, LOCATION, NULL, "ignore information because the message has no hash payload.\n"); goto end; } if (iph1->status != PHASE1ST_ESTABLISHED) { plog(LLV_ERROR, LOCATION, NULL, "ignore information because ISAKMP-SA has not been established yet.\n"); goto end; } np = gen->np; { void *p; vchar_t *hash, *payload; struct isakmp_gen *nd; /* * XXX: gen->len includes isakmp header length */ p = (caddr_t) gen + sizeof(struct isakmp_gen); nd = (struct isakmp_gen *) ((caddr_t) gen + ntohs(gen->len)); /* nd length check */ if (ntohs(nd->len) > msg->l - (sizeof(struct isakmp) + ntohs(gen->len))) { plog(LLV_ERROR, LOCATION, NULL, "too long payload length (broken message?)\n"); goto end; } payload = vmalloc(ntohs(nd->len)); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "cannot allocate memory\n"); goto end; } memcpy(payload->v, (caddr_t) nd, ntohs(nd->len)); /* compute HASH */ hash = oakley_compute_hash1(iph1, isakmp->msgid, payload); if (hash == NULL) { plog(LLV_ERROR, LOCATION, NULL, "cannot compute hash\n"); vfree(payload); goto end; } if (ntohs(gen->len) - sizeof(struct isakmp_gen) != hash->l) { plog(LLV_ERROR, LOCATION, NULL, "ignore information due to hash length mismatch\n"); vfree(hash); vfree(payload); goto end; } if (memcmp(p, hash->v, hash->l) != 0) { plog(LLV_ERROR, LOCATION, NULL, "ignore information due to hash mismatch\n"); vfree(hash); vfree(payload); goto end; } plog(LLV_DEBUG, LOCATION, NULL, "hash validated.\n"); vfree(hash); vfree(payload); } /* make sure the packet were encrypted. */ if (!encrypted) { switch (iph1->etype) { case ISAKMP_ETYPE_AGG: case ISAKMP_ETYPE_BASE: case ISAKMP_ETYPE_IDENT: if ((iph1->side == INITIATOR && iph1->status < PHASE1ST_MSG3SENT) || (iph1->side == RESPONDER && iph1->status < PHASE1ST_MSG2SENT)) { break; } /*FALLTHRU*/ default: plog(LLV_ERROR, LOCATION, iph1->remote, "%s message must be encrypted\n", s_isakmp_nptype(np)); goto end; } } switch (np) { case ISAKMP_NPTYPE_N: if (isakmp_info_recv_n(iph1, msg) < 0) goto end; break; case ISAKMP_NPTYPE_D: if (isakmp_info_recv_d(iph1, msg) < 0) goto end; break; case ISAKMP_NPTYPE_NONCE: /* XXX to be 6.4.2 ike-01.txt */ /* XXX IV is to be synchronized. */ plog(LLV_ERROR, LOCATION, iph1->remote, "ignore Acknowledged Informational\n"); break; default: /* don't send information, see isakmp_ident_r1() */ error = 0; plog(LLV_ERROR, LOCATION, iph1->remote, "reject the packet, " "received unexpecting payload type %d.\n", gen->np); goto end; } end: if (msg != NULL) vfree(msg); return 0; } /* * send Delete payload (for ISAKMP SA) in Informational exchange. */ int isakmp_info_send_d1(iph1) struct ph1handle *iph1; { struct isakmp_pl_d *d; vchar_t *payload = NULL; int tlen; int error = 0; if (iph1->status != PHASE2ST_ESTABLISHED) return 0; /* create delete payload */ /* send SPIs of inbound SAs. */ /* XXX should send outbound SAs's ? */ tlen = sizeof(*d) + sizeof(isakmp_index); payload = vmalloc(tlen); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer for payload.\n"); return errno; } d = (struct isakmp_pl_d *)payload->v; d->h.np = ISAKMP_NPTYPE_NONE; d->h.len = htons(tlen); d->doi = htonl(IPSEC_DOI); d->proto_id = IPSECDOI_PROTO_ISAKMP; d->spi_size = sizeof(isakmp_index); d->num_spi = htons(1); memcpy(d + 1, &iph1->index, sizeof(isakmp_index)); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_D, 0); vfree(payload); return error; } /* * send Delete payload (for IPsec SA) in Informational exchange, based on * pfkey msg. It sends always single SPI. */ int isakmp_info_send_d2(iph2) struct ph2handle *iph2; { struct ph1handle *iph1; struct saproto *pr; struct isakmp_pl_d *d; vchar_t *payload = NULL; int tlen; int error = 0; u_int8_t *spi; if (iph2->status != PHASE2ST_ESTABLISHED) return 0; /* * don't send delete information if there is no phase 1 handler. * It's nonsensical to negotiate phase 1 to send the information. */ iph1 = getph1byaddr(iph2->src, iph2->dst); if (iph1 == NULL) return 0; /* create delete payload */ for (pr = iph2->approval->head; pr != NULL; pr = pr->next) { /* send SPIs of inbound SAs. */ /* * XXX should I send outbound SAs's ? * I send inbound SAs's SPI only at the moment because I can't * decode any more if peer send encoded packet without aware of * deletion of SA. Outbound SAs don't come under the situation. */ tlen = sizeof(*d) + pr->spisize; payload = vmalloc(tlen); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer for payload.\n"); return errno; } d = (struct isakmp_pl_d *)payload->v; d->h.np = ISAKMP_NPTYPE_NONE; d->h.len = htons(tlen); d->doi = htonl(IPSEC_DOI); d->proto_id = pr->proto_id; d->spi_size = pr->spisize; d->num_spi = htons(1); /* * XXX SPI bits are left-filled, for use with IPComp. * we should be switching to variable-length spi field... */ spi = (u_int8_t *)&pr->spi; spi += sizeof(pr->spi); spi -= pr->spisize; memcpy(d + 1, spi, pr->spisize); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_D, 0); vfree(payload); } return error; } /* * send Notification payload (for without ISAKMP SA) in Informational exchange */ int isakmp_info_send_nx(isakmp, remote, local, type, data) struct isakmp *isakmp; struct sockaddr *remote, *local; int type; vchar_t *data; { struct ph1handle *iph1 = NULL; struct remoteconf *rmconf; vchar_t *payload = NULL; int tlen; int error = -1; struct isakmp_pl_n *n; int spisiz = 0; /* see below */ /* search appropreate configuration */ rmconf = getrmconf(remote); if (rmconf == NULL) { plog(LLV_ERROR, LOCATION, remote, "no configuration found for peer address.\n"); goto end; } /* add new entry to isakmp status table. */ iph1 = newph1(); if (iph1 == NULL) return -1; memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(cookie_t)); isakmp_newcookie((char *)&iph1->index.r_ck, remote, local); iph1->status = PHASE1ST_START; iph1->rmconf = rmconf; iph1->side = INITIATOR; iph1->version = isakmp->v; iph1->flags = 0; iph1->msgid = 0; /* XXX */ /* copy remote address */ if (copy_ph1addresses(iph1, rmconf, remote, local) < 0) return -1; tlen = sizeof(*n) + spisiz; if (data) tlen += data->l; payload = vmalloc(tlen); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer to send.\n"); goto end; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; n->h.len = htons(tlen); n->doi = htonl(IPSEC_DOI); n->proto_id = IPSECDOI_KEY_IKE; n->spi_size = spisiz; n->type = htons(type); if (spisiz) memset(n + 1, 0, spisiz); /*XXX*/ if (data) memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); vfree(payload); end: if (iph1 != NULL) delph1(iph1); return error; } /* * send Notification payload (for ISAKMP SA) in Informational exchange */ int isakmp_info_send_n1(iph1, type, data) struct ph1handle *iph1; int type; vchar_t *data; { vchar_t *payload = NULL; int tlen; int error = 0; struct isakmp_pl_n *n; int spisiz; /* * note on SPI size: which description is correct? I have chosen * this to be 0. * * RFC2408 3.1, 2nd paragraph says: ISAKMP SA is identified by * Initiator/Responder cookie and SPI has no meaning, SPI size = 0. * RFC2408 3.1, first paragraph on page 40: ISAKMP SA is identified * by cookie and SPI has no meaning, 0 <= SPI size <= 16. * RFC2407 4.6.3.3, INITIAL-CONTACT is required to set to 16. */ if (type == ISAKMP_NTYPE_INITIAL_CONTACT) spisiz = sizeof(isakmp_index); else spisiz = 0; tlen = sizeof(*n) + spisiz; if (data) tlen += data->l; payload = vmalloc(tlen); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer to send.\n"); return errno; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; n->h.len = htons(tlen); n->doi = htonl(iph1->rmconf->doitype); n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */ n->spi_size = spisiz; n->type = htons(type); if (spisiz) memcpy(n + 1, &iph1->index, sizeof(isakmp_index)); if (data) memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags); vfree(payload); return error; } /* * send Notification payload (for IPsec SA) in Informational exchange */ int isakmp_info_send_n2(iph2, type, data) struct ph2handle *iph2; int type; vchar_t *data; { struct ph1handle *iph1 = iph2->ph1; vchar_t *payload = NULL; int tlen; int error = 0; struct isakmp_pl_n *n; struct saproto *pr; if (!iph2->approval) return EINVAL; pr = iph2->approval->head; /* XXX must be get proper spi */ tlen = sizeof(*n) + pr->spisize; if (data) tlen += data->l; payload = vmalloc(tlen); if (payload == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer to send.\n"); return errno; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; n->h.len = htons(tlen); n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ n->spi_size = pr->spisize; n->type = htons(type); *(u_int32_t *)(n + 1) = pr->spi; if (data) memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); iph2->flags |= ISAKMP_FLAG_E; /* XXX Should we do FLAG_A ? */ error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph2->flags); vfree(payload); return error; } /* * send Information * When ph1->skeyid_a == NULL, send message without encoding. */ int isakmp_info_send_common(iph1, payload, np, flags) struct ph1handle *iph1; vchar_t *payload; u_int32_t np; int flags; { struct ph2handle *iph2 = NULL; vchar_t *hash = NULL; struct isakmp *isakmp; struct isakmp_gen *gen; char *p; int tlen; int error = -1; /* add new entry to isakmp status table */ iph2 = newph2(); if (iph2 == NULL) goto end; iph2->dst = dupsaddr(iph1->remote); iph2->src = dupsaddr(iph1->local); switch (iph1->remote->sa_family) { case AF_INET: ((struct sockaddr_in *)iph2->dst)->sin_port = 0; ((struct sockaddr_in *)iph2->src)->sin_port = 0; break; #ifdef INET6 case AF_INET6: ((struct sockaddr_in6 *)iph2->dst)->sin6_port = 0; ((struct sockaddr_in6 *)iph2->src)->sin6_port = 0; break; #endif default: plog(LLV_ERROR, LOCATION, NULL, "invalid family: %d\n", iph1->remote->sa_family); delph2(iph2); goto end; } iph2->ph1 = iph1; iph2->side = INITIATOR; iph2->status = PHASE2ST_START; iph2->msgid = isakmp_newmsgid2(iph1); /* get IV and HASH(1) if skeyid_a was generated. */ if (iph1->skeyid_a != NULL) { iph2->ivm = oakley_newiv2(iph1, iph2->msgid); if (iph2->ivm == NULL) { delph2(iph2); goto end; } /* generate HASH(1) */ hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, payload); if (hash == NULL) { delph2(iph2); goto end; } /* initialized total buffer length */ tlen = hash->l; tlen += sizeof(*gen); } else { /* IKE-SA is not established */ hash = NULL; /* initialized total buffer length */ tlen = 0; } if ((flags & ISAKMP_FLAG_A) == 0) iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_E); else iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_A); insph2(iph2); bindph12(iph1, iph2); tlen += sizeof(*isakmp) + payload->l; /* create buffer for isakmp payload */ iph2->sendbuf = vmalloc(tlen); if (iph2->sendbuf == NULL) { plog(LLV_ERROR, LOCATION, NULL, "failed to get buffer to send.\n"); goto err; } /* create isakmp header */ isakmp = (struct isakmp *)iph2->sendbuf->v; memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t)); memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t)); isakmp->np = hash == NULL ? (np & 0xff) : ISAKMP_NPTYPE_HASH; isakmp->v = iph1->version; isakmp->etype = ISAKMP_ETYPE_INFO; isakmp->flags = iph2->flags; memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid)); isakmp->len = htonl(tlen); p = (char *)(isakmp + 1); /* create HASH payload */ if (hash != NULL) { gen = (struct isakmp_gen *)p; gen->np = np & 0xff; gen->len = htons(sizeof(*gen) + hash->l); p += sizeof(*gen); memcpy(p, hash->v, hash->l); p += hash->l; } /* add payload */ memcpy(p, payload->v, payload->l); p += payload->l; #ifdef HAVE_PRINT_ISAKMP_C isakmp_printpacket(iph2->sendbuf, iph1->local, iph1->remote, 1); #endif /* encoding */ if (ISSET(isakmp->flags, ISAKMP_FLAG_E)) { vchar_t *tmp; tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive, iph2->ivm->iv); if (tmp == NULL) { vfree(iph2->sendbuf); iph2->sendbuf = NULL; goto err; } vfree(iph2->sendbuf); iph2->sendbuf = tmp; } /* HDR*, HASH(1), N */ if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) { vfree(iph2->sendbuf); iph2->sendbuf = NULL; goto err; } plog(LLV_DEBUG, LOCATION, NULL, "sendto Information %s.\n", s_isakmp_nptype(np)); /* * don't resend notify message because peer can use Acknowledged * Informational if peer requires the reply of the notify message. */ /* XXX If Acknowledged Informational required, don't delete ph2handle */ error = 0; vfree(iph2->sendbuf); iph2->sendbuf = NULL; goto err; /* XXX */ end: if (hash) vfree(hash); return error; err: unbindph12(iph2); remph2(iph2); delph2(iph2); goto end; } /* * add a notify payload to buffer by reallocating buffer. * If buf == NULL, the function only create a notify payload. * * XXX Which is SPI to be included, inbound or outbound ? */ vchar_t * isakmp_add_pl_n(buf0, np_p, type, pr, data) vchar_t *buf0; u_int8_t **np_p; int type; struct saproto *pr; vchar_t *data; { vchar_t *buf = NULL; struct isakmp_pl_n *n; int tlen; int oldlen = 0; if (*np_p) **np_p = ISAKMP_NPTYPE_N; tlen = sizeof(*n) + pr->spisize; if (data) tlen += data->l; if (buf0) { oldlen = buf0->l; buf = vrealloc(buf0, buf0->l + tlen); } else buf = vmalloc(tlen); if (!buf) { plog(LLV_ERROR, LOCATION, NULL, "failed to get a payload buffer.\n"); return NULL; } n = (struct isakmp_pl_n *)(buf->v + oldlen); n->h.np = ISAKMP_NPTYPE_NONE; n->h.len = htons(tlen); n->doi = htonl(IPSEC_DOI); /* IPSEC DOI (1) */ n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ n->spi_size = pr->spisize; n->type = htons(type); *(u_int32_t *)(n + 1) = pr->spi; /* XXX */ if (data) memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l); /* save the pointer of next payload type */ *np_p = &n->h.np; return buf; } /* * handling to receive Notification payload */ static int isakmp_info_recv_n(iph1, msg) struct ph1handle *iph1; vchar_t *msg; { struct isakmp_pl_n *n = NULL; u_int type; vchar_t *pbuf; struct isakmp_parse_t *pa, *pap; char *spi; if (!(pbuf = isakmp_parse(msg))) return -1; pa = (struct isakmp_parse_t *)pbuf->v; for (pap = pa; pap->type; pap++) { switch (pap->type) { case ISAKMP_NPTYPE_HASH: /* do something here */ break; case ISAKMP_NPTYPE_NONCE: /* send to ack */ break; case ISAKMP_NPTYPE_N: n = (struct isakmp_pl_n *)pap->ptr; break; default: vfree(pbuf); return -1; } } vfree(pbuf); if (!n) return -1; type = ntohs(n->type); switch (type) { case ISAKMP_NTYPE_CONNECTED: case ISAKMP_NTYPE_RESPONDER_LIFETIME: case ISAKMP_NTYPE_REPLAY_STATUS: /* do something */ break; case ISAKMP_NTYPE_INITIAL_CONTACT: info_recv_initialcontact(iph1); break; default: { u_int32_t msgid = ((struct isakmp *)msg->v)->msgid; struct ph2handle *iph2; /* XXX there is a potential of dos attack. */ if (msgid == 0) { /* delete ph1 */ plog(LLV_ERROR, LOCATION, iph1->remote, "delete phase1 handle.\n"); return -1; } else { iph2 = getph2bymsgid(iph1, msgid); if (iph2 == NULL) { plog(LLV_ERROR, LOCATION, iph1->remote, "unknown notify message, " "no phase2 handle found.\n"); } else { /* delete ph2 */ unbindph12(iph2); remph2(iph2); delph2(iph2); } } } break; } /* get spi and allocate */ if (ntohs(n->h.len) < sizeof(*n) + n->spi_size) { plog(LLV_ERROR, LOCATION, iph1->remote, "invalid spi_size in notification payload.\n"); return -1; } spi = val2str((u_char *)(n + 1), n->spi_size); plog(LLV_DEBUG, LOCATION, iph1->remote, "notification message %d:%s, " "doi=%d proto_id=%d spi=%s(size=%d).\n", type, s_isakmp_notify_msg(type), ntohl(n->doi), n->proto_id, spi, n->spi_size); racoon_free(spi); return(0); } static void purge_isakmp_spi(proto, spi, n) int proto; isakmp_index *spi; /*network byteorder*/ size_t n; { struct ph1handle *iph1; size_t i; for (i = 0; i < n; i++) { iph1 = getph1byindex(&spi[i]); if (!iph1) continue; plog(LLV_INFO, LOCATION, NULL, "purged ISAKMP-SA proto_id=%s spi=%s.\n", s_ipsecdoi_proto(proto), isakmp_pindex(&spi[i], 0)); if (iph1->sce) SCHED_KILL(iph1->sce); iph1->status = PHASE1ST_EXPIRED; iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1); } } static void purge_ipsec_spi(dst0, proto, spi, n) struct sockaddr *dst0; int proto; u_int32_t *spi; /*network byteorder*/ size_t n; { vchar_t *buf = NULL; struct sadb_msg *msg, *next, *end; struct sadb_sa *sa; struct sockaddr *src, *dst; struct ph2handle *iph2; size_t i; caddr_t mhp[SADB_EXT_MAX + 1]; buf = pfkey_dump_sadb(ipsecdoi2pfkey_proto(proto)); if (buf == NULL) { plog(LLV_DEBUG, LOCATION, NULL, "pfkey_dump_sadb returned nothing.\n"); return; } msg = (struct sadb_msg *)buf->v; end = (struct sadb_msg *)(buf->v + buf->l); while (msg < end) { if ((msg->sadb_msg_len << 3) < sizeof(*msg)) break; next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); if (msg->sadb_msg_type != SADB_DUMP) { msg = next; continue; } if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { plog(LLV_ERROR, LOCATION, NULL, "pfkey_check (%s)\n", ipsec_strerror()); msg = next; continue; } sa = (struct sadb_sa *)(mhp[SADB_EXT_SA]); if (!sa || !mhp[SADB_EXT_ADDRESS_SRC] || !mhp[SADB_EXT_ADDRESS_DST]) { msg = next; continue; } src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); if (sa->sadb_sa_state != SADB_SASTATE_MATURE && sa->sadb_sa_state != SADB_SASTATE_DYING) { msg = next; continue; } /* XXX n^2 algorithm, inefficient */ /* don't delete inbound SAs at the moment */ /* XXX should we remove SAs with opposite direction as well? */ if (cmpsaddrwop(dst0, dst)) { msg = next; continue; } for (i = 0; i < n; i++) { plog(LLV_DEBUG, LOCATION, NULL, "check spi(packet)=%u spi(db)=%u.\n", ntohl(spi[i]), ntohl(sa->sadb_sa_spi)); if (spi[i] != sa->sadb_sa_spi) continue; pfkey_send_delete(lcconf->sock_pfkey, msg->sadb_msg_satype, IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi); /* * delete a relative phase 2 handler. * continue to process if no relative phase 2 handler * exists. */ iph2 = getph2bysaidx(src, dst, proto, spi[i]); if (iph2) { unbindph12(iph2); remph2(iph2); delph2(iph2); } plog(LLV_INFO, LOCATION, NULL, "purged IPsec-SA proto_id=%s spi=%u.\n", s_ipsecdoi_proto(proto), ntohl(spi[i])); } msg = next; } if (buf) vfree(buf); } /* * delete all phase2 sa relatived to the destination address. * Don't delete Phase 1 handlers on INITIAL-CONTACT, and don't ignore * an INITIAL-CONTACT if we have contacted the peer. This matches the * Sun IKE behavior, and makes rekeying work much better when the peer * restarts. */ static void info_recv_initialcontact(iph1) struct ph1handle *iph1; { vchar_t *buf = NULL; struct sadb_msg *msg, *next, *end; struct sadb_sa *sa; struct sockaddr *src, *dst; caddr_t mhp[SADB_EXT_MAX + 1]; int proto_id, i; struct ph2handle *iph2; #if 0 char *loc, *rem; #endif if (f_local) return; #if 0 loc = strdup(saddrwop2str(iph1->local)); rem = strdup(saddrwop2str(iph1->remote)); /* * Purge all IPSEC-SAs for the peer. We can do this * the easy way (using a PF_KEY SADB_DELETE extension) * or we can do it the hard way. */ for (i = 0; i < pfkey_nsatypes; i++) { proto_id = pfkey2ipsecdoi_proto(pfkey_satypes[i].ps_satype); plog(LLV_INFO, LOCATION, NULL, "purging %s SAs for %s -> %s\n", pfkey_satypes[i].ps_name, loc, rem); if (pfkey_send_delete_all(lcconf->sock_pfkey, pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, iph1->local, iph1->remote) == -1) { plog(LLV_ERROR, LOCATION, NULL, "delete_all %s -> %s failed for %s (%s)\n", loc, rem, pfkey_satypes[i].ps_name, ipsec_strerror()); goto the_hard_way; } deleteallph2(iph1->local, iph1->remote, proto_id); plog(LLV_INFO, LOCATION, NULL, "purging %s SAs for %s -> %s\n", pfkey_satypes[i].ps_name, rem, loc); if (pfkey_send_delete_all(lcconf->sock_pfkey, pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY, iph1->remote, iph1->local) == -1) { plog(LLV_ERROR, LOCATION, NULL, "delete_all %s -> %s failed for %s (%s)\n", rem, loc, pfkey_satypes[i].ps_name, ipsec_strerror()); goto the_hard_way; } deleteallph2(iph1->remote, iph1->local, proto_id); } racoon_free(loc); racoon_free(rem); return; the_hard_way: racoon_free(loc); racoon_free(rem); #endif buf = pfkey_dump_sadb(SADB_SATYPE_UNSPEC); if (buf == NULL) { plog(LLV_DEBUG, LOCATION, NULL, "pfkey_dump_sadb returned nothing.\n"); return; } msg = (struct sadb_msg *)buf->v; end = (struct sadb_msg *)(buf->v + buf->l); while (msg < end) { if ((msg->sadb_msg_len << 3) < sizeof(*msg)) break; next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3)); if (msg->sadb_msg_type != SADB_DUMP) { msg = next; continue; } if (pfkey_align(msg, mhp) || pfkey_check(mhp)) { plog(LLV_ERROR, LOCATION, NULL, "pfkey_check (%s)\n", ipsec_strerror()); msg = next; continue; } if (mhp[SADB_EXT_SA] == NULL || mhp[SADB_EXT_ADDRESS_SRC] == NULL || mhp[SADB_EXT_ADDRESS_DST] == NULL) { msg = next; continue; } sa = (struct sadb_sa *)mhp[SADB_EXT_SA]; src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]); dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]); if (sa->sadb_sa_state != SADB_SASTATE_MATURE && sa->sadb_sa_state != SADB_SASTATE_DYING) { msg = next; continue; } /* * RFC2407 4.6.3.3 INITIAL-CONTACT is the message that * announces the sender of the message was rebooted. * it is interpreted to delete all SAs which source address * is the sender of the message. * racoon only deletes SA which is matched both the * source address and the destination accress. */ if (cmpsaddrwop(iph1->local, src) == 0 && cmpsaddrwop(iph1->remote, dst) == 0) ; else if (cmpsaddrwop(iph1->remote, src) == 0 && cmpsaddrwop(iph1->local, dst) == 0) ; else { msg = next; continue; } /* * Make sure this is an SATYPE that we manage. * This is gross; too bad we couldn't do it the * easy way. */ for (i = 0; i < pfkey_nsatypes; i++) { if (pfkey_satypes[i].ps_satype == msg->sadb_msg_satype) break; } if (i == pfkey_nsatypes) { msg = next; continue; } plog(LLV_INFO, LOCATION, NULL, "purging spi=%u.\n", ntohl(sa->sadb_sa_spi)); pfkey_send_delete(lcconf->sock_pfkey, msg->sadb_msg_satype, IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi); /* * delete a relative phase 2 handler. * continue to process if no relative phase 2 handler * exists. */ proto_id = pfkey2ipsecdoi_proto(msg->sadb_msg_satype); iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi); if (iph2) { unbindph12(iph2); remph2(iph2); delph2(iph2); } msg = next; } vfree(buf); } /* * handling to receive Deletion payload */ static int isakmp_info_recv_d(iph1, msg) struct ph1handle *iph1; vchar_t *msg; { struct isakmp_pl_d *d; int tlen, num_spi; vchar_t *pbuf; struct isakmp_parse_t *pa, *pap; int protected = 0; union { u_int32_t spi32; u_int16_t spi16[2]; } spi; /* validate the type of next payload */ if (!(pbuf = isakmp_parse(msg))) return -1; pa = (struct isakmp_parse_t *)pbuf->v; for (pap = pa; pap->type; pap++) { switch (pap->type) { case ISAKMP_NPTYPE_D: break; case ISAKMP_NPTYPE_HASH: if (pap == pa) { protected++; break; } plog(LLV_ERROR, LOCATION, iph1->remote, "received next payload type %d " "in wrong place (must be the first payload).\n", pap->type); vfree(pbuf); return -1; default: /* don't send information, see isakmp_ident_r1() */ plog(LLV_ERROR, LOCATION, iph1->remote, "reject the packet, " "received unexpecting payload type %d.\n", pap->type); vfree(pbuf); return 0; } } if (!protected) { plog(LLV_ERROR, LOCATION, NULL, "delete payload is not proteted, " "ignored.\n"); vfree(pbuf); return -1; } /* process a delete payload */ for (pap = pa; pap->type; pap++) { if (pap->type != ISAKMP_NPTYPE_D) continue; d = (struct isakmp_pl_d *)pap->ptr; if (ntohl(d->doi) != IPSEC_DOI) { plog(LLV_ERROR, LOCATION, iph1->remote, "delete payload with invalid doi:%d.\n", ntohl(d->doi)); continue; } num_spi = ntohs(d->num_spi); tlen = ntohs(d->h.len) - sizeof(struct isakmp_pl_d); if (tlen != num_spi * d->spi_size) { plog(LLV_ERROR, LOCATION, iph1->remote, "deletion payload with invalid length.\n"); vfree(pbuf); return -1; } switch (d->proto_id) { case IPSECDOI_PROTO_ISAKMP: if (d->spi_size != sizeof(isakmp_index)) { plog(LLV_ERROR, LOCATION, iph1->remote, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } purge_isakmp_spi(d->proto_id, (isakmp_index *)(d + 1), num_spi); break; case IPSECDOI_PROTO_IPSEC_AH: case IPSECDOI_PROTO_IPSEC_ESP: if (d->spi_size != sizeof(u_int32_t)) { plog(LLV_ERROR, LOCATION, iph1->remote, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } purge_ipsec_spi(iph1->remote, d->proto_id, (u_int32_t *)(d + 1), num_spi); break; case IPSECDOI_PROTO_IPCOMP: /* need to handle both 16bit/32bit SPI */ memset(&spi, 0, sizeof(spi)); if (d->spi_size == sizeof(spi.spi16[1])) { memcpy(&spi.spi16[1], d + 1, sizeof(spi.spi16[1])); } else if (d->spi_size == sizeof(spi.spi32)) memcpy(&spi.spi32, d + 1, sizeof(spi.spi32)); else { plog(LLV_ERROR, LOCATION, iph1->remote, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } purge_ipsec_spi(iph1->remote, d->proto_id, &spi.spi32, num_spi); break; default: plog(LLV_ERROR, LOCATION, iph1->remote, "deletion message received, " "invalid proto_id: %d\n", d->proto_id); continue; } plog(LLV_DEBUG, LOCATION, NULL, "purged SAs.\n"); } vfree(pbuf); return 0; } void isakmp_check_notify(gen, iph1) struct isakmp_gen *gen; /* points to Notify payload */ struct ph1handle *iph1; { struct isakmp_pl_n *notify = (struct isakmp_pl_n *)gen; plog(LLV_DEBUG, LOCATION, iph1->remote, "Notify Message received\n"); switch (ntohs(notify->type)) { case ISAKMP_NTYPE_CONNECTED: plog(LLV_WARNING, LOCATION, iph1->remote, "ignore CONNECTED notification.\n"); break; case ISAKMP_NTYPE_RESPONDER_LIFETIME: plog(LLV_WARNING, LOCATION, iph1->remote, "ignore RESPONDER-LIFETIME notification.\n"); break; case ISAKMP_NTYPE_REPLAY_STATUS: plog(LLV_WARNING, LOCATION, iph1->remote, "ignore REPLAY-STATUS notification.\n"); break; case ISAKMP_NTYPE_INITIAL_CONTACT: plog(LLV_WARNING, LOCATION, iph1->remote, "ignore INITIAL-CONTACT notification, " "because it is only accepted after phase1.\n"); break; default: isakmp_info_send_n1(iph1, ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE, NULL); plog(LLV_ERROR, LOCATION, iph1->remote, "received unknown notification type %u.\n", ntohs(notify->type)); } return; }