/* $Id: isakmp_inf.c,v 1.18 2008/07/07 09:36:08 fukumoto 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 HAVE_NETINET6_IPSEC_H # include #else # ifdef HAVE_NETIPSEC_IPSEC_H # include # else # ifndef sun /* XXX KEBE SAYS OpenSolaris */ # include # endif # endif #endif #include #include #include #include #if TIME_WITH_SYS_TIME # include # include #else # if HAVE_SYS_TIME_H # include # else # include # endif #endif #ifdef ENABLE_HYBRID #include #endif #include "racoon.h" /* #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 "proposal.h" #include "sockmisc.h" #include "evt.h" #include "isakmp.h" #include "isakmp_var.h" #include "isakmp_impl.h" #include "ikev1_impl.h" #ifdef ENABLE_HYBRID #include "isakmp_xauth.h" #include "isakmp_unity.h" #include "isakmp_cfg.h" #endif #include "isakmp_inf.h" #include "oakley.h" #include "ipsec_doi.h" #include "handler.h" #include "crypto_impl.h" #include "pfkey.h" /* #include "policy.h" */ #include "algorithm.h" /* #include "admin.h" */ #include "strnames.h" #ifdef ENABLE_NATT #include "ikev1_natt.h" #endif #include "ike_conf.h" /* information exchange */ static int isakmp_info_recv_n (struct ph1handle *, rc_vchar_t *); static int isakmp_info_recv_d (struct ph1handle *, rc_vchar_t *); static int isakmp_info_recv_r_u (struct ph1handle *, struct isakmp_pl_ru *, uint32_t); static int isakmp_info_recv_r_u_ack (struct ph1handle *, struct isakmp_pl_ru *, uint32_t); static void isakmp_info_send_r_u (void *); /* static void purge_isakmp_spi (int, isakmp_index_t *, size_t); */ static void info_recv_initialcontact (struct ph1handle *); /* %%% * Information Exchange */ /* * receive Information */ int isakmp_info_recv(struct ph1handle *iph1, rc_vchar_t *msg0) { rc_vchar_t *msg = NULL; struct isakmp *isakmp; struct isakmp_gen *gen; void *p; rc_vchar_t *hash, *payload; struct isakmp_gen *nd; uint8_t np; int encrypted; plog(PLOG_DEBUG, PLOGLOC, 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; if (iph1->ivm == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "iph1->ivm == NULL\n"); return -1; } /* 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 = rc_vdup(msg0); /* Safety check */ if (msg->l < sizeof(*isakmp) + sizeof(*gen)) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information because the " "message is way too short\n"); goto end; } isakmp = (struct isakmp *)msg->v; gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp)); np = gen->np; if (encrypted) { if (isakmp->np != ISAKMP_NPTYPE_HASH) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information because the " "message has no hash payload.\n"); goto end; } if (iph1->status != PHASE1ST_ESTABLISHED) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information because ISAKMP-SA " "has not been established yet.\n"); goto end; } /* Safety check */ if (msg->l < sizeof(*isakmp) + get_uint16(&gen->len) + sizeof(*nd)) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information because the " "message is too short\n"); goto end; } p = (caddr_t) gen + sizeof(struct isakmp_gen); nd = (struct isakmp_gen *) ((caddr_t) gen + get_uint16(&gen->len)); /* nd length check */ if (get_uint16(&nd->len) > msg->l - (sizeof(struct isakmp) + get_uint16(&gen->len))) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "too long payload length (broken message?)\n"); goto end; } if (get_uint16(&nd->len) < sizeof(*nd)) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "too short payload length (broken message?)\n"); goto end; } payload = rc_vmalloc(get_uint16(&nd->len)); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "cannot allocate memory\n"); goto end; } memcpy(payload->v, (caddr_t) nd, get_uint16(&nd->len)); /* compute HASH */ hash = oakley_compute_hash1(iph1, isakmp->msgid, payload); if (hash == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "cannot compute hash\n"); rc_vfree(payload); goto end; } if (get_uint16(&gen->len) - sizeof(struct isakmp_gen) != hash->l) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information due to hash length mismatch\n"); rc_vfree(hash); rc_vfree(payload); goto end; } if (memcmp(p, hash->v, hash->l) != 0) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "ignore information due to hash mismatch\n"); rc_vfree(hash); rc_vfree(payload); goto end; } plog(PLOG_DEBUG, PLOGLOC, NULL, "hash validated.\n"); rc_vfree(hash); rc_vfree(payload); } else { /* make sure the packet was encrypted after the beginning of phase 1. */ 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(PLOG_PROTOERR, PLOGLOC, 0, "received %s payload is not encrypted\n", s_isakmp_nptype(isakmp->np)); goto end; } } switch (np) { case ISAKMP_NPTYPE_N: if ( encrypted ) isakmp_info_recv_n(iph1, msg); else plog(PLOG_PROTOWARN, PLOGLOC, 0, "received unencrypted Notify payload, ignored\n"); break; case ISAKMP_NPTYPE_D: if ( encrypted ) isakmp_info_recv_d(iph1, msg); else plog(PLOG_PROTOWARN, PLOGLOC, 0, "received unencrypted Delete payload, ignored\n"); break; case ISAKMP_NPTYPE_NONCE: /* XXX to be 6.4.2 ike-01.txt */ /* XXX IV is to be synchronized. */ plog(PLOG_PROTOERR, PLOGLOC, 0, "ignore Acknowledged Informational\n"); break; default: /* don't send information, see isakmp_ident_r1() */ plog(PLOG_PROTOERR, PLOGLOC, 0, "reject the packet, " "received unexpected payload type %s.\n", s_isakmp_nptype(gen->np)); goto end; } end: if (msg != NULL) rc_vfree(msg); return 0; } /* * send Delete payload (for ISAKMP SA) in Informational exchange. */ int isakmp_info_send_d1(struct ph1handle *iph1) { struct isakmp_pl_d *d; rc_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_t); payload = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer for payload.\n"); return errno; } d = (struct isakmp_pl_d *)payload->v; d->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&d->h.len, tlen); put_uint32(&d->doi, IPSEC_DOI); d->proto_id = IPSECDOI_PROTO_ISAKMP; d->spi_size = sizeof(isakmp_index_t); put_uint16(&d->num_spi, 1); memcpy(d + 1, &iph1->index, sizeof(isakmp_index_t)); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_D, 0); rc_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(struct ph2handle *iph2) { struct ph1handle *iph1; struct saproto *pr; struct isakmp_pl_d *d; rc_vchar_t *payload = NULL; int tlen; int error = 0; uint8_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 = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer for payload.\n"); return errno; } d = (struct isakmp_pl_d *)payload->v; d->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&d->h.len, tlen); put_uint32(&d->doi, IPSEC_DOI); d->proto_id = pr->proto_id; d->spi_size = pr->spisize; put_uint16(&d->num_spi, 1); /* * XXX SPI bits are left-filled, for use with IPComp. * we should be switching to variable-length spi field... */ spi = (uint8_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); rc_vfree(payload); } return error; } /* * send Notification payload (for without ISAKMP SA) in Informational exchange */ int isakmp_info_send_nx(struct isakmp *isakmp, struct sockaddr *remote, struct sockaddr *local, int type, rc_vchar_t *data) { struct ph1handle *iph1 = NULL; struct rcf_remote *rmconf; rc_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(PLOG_INTERR, PLOGLOC, 0, "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(isakmp_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 */ #ifdef ENABLE_HYBRID if ((iph1->mode_cfg = isakmp_cfg_mkstate()) == NULL) { error = -1; goto end; } #endif #ifdef ENABLE_FRAG iph1->frag = 0; iph1->frag_chain = NULL; #endif iph1->proposal = ikev1_conf_to_isakmpsa(rmconf); /* copy remote address */ if (copy_ph1addresses(iph1, rmconf, remote, local) < 0) { error = -1; goto end; } tlen = sizeof(*n) + spisiz; if (data) tlen += data->l; payload = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer to send.\n"); error = -1; goto end; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&n->h.len, tlen); put_uint32(&n->doi, IPSEC_DOI); n->proto_id = IPSECDOI_KEY_IKE; n->spi_size = spisiz; put_uint16(&n->type, 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); rc_vfree(payload); end: if (iph1 != NULL) delph1(iph1); return error; } /* * send Notification payload (for ISAKMP SA) in Informational exchange */ int isakmp_info_send_n1(struct ph1handle *iph1, int type, rc_vchar_t *data) { rc_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_t); else spisiz = 0; tlen = sizeof(*n) + spisiz; if (data) tlen += data->l; payload = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer to send.\n"); return errno; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&n->h.len, tlen); put_uint32(&n->doi, ikev1_doitype(iph1->rmconf)); n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */ n->spi_size = spisiz; put_uint16(&n->type, type); if (spisiz) memcpy(n + 1, &iph1->index, sizeof(isakmp_index_t)); if (data) memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags); rc_vfree(payload); return error; } /* * send Notification payload (for IPsec SA) in Informational exchange */ int isakmp_info_send_n2(struct ph2handle *iph2, int type, rc_vchar_t *data) { struct ph1handle *iph1 = iph2->ph1; rc_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 = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer to send.\n"); return errno; } n = (struct isakmp_pl_n *)payload->v; n->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&n->h.len, tlen); put_uint32(&n->doi, IPSEC_DOI); /* IPSEC DOI (1) */ n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ n->spi_size = pr->spisize; put_uint16(&n->type, type); memcpy((uint8_t *)(n + 1), &pr->spi, pr->spisize); 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); rc_vfree(payload); return error; } /* * send Information * When ph1->skeyid_a == NULL, send message without encoding. */ int isakmp_info_send_common(struct ph1handle *iph1, rc_vchar_t *payload, uint32_t np, int flags) { struct ph2handle *iph2 = NULL; rc_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 = rcs_sadup(iph1->remote); if (iph2->dst == NULL) { delph2(iph2); goto end; } iph2->src = rcs_sadup(iph1->local); if (iph2->src == NULL) { 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 = rc_vmalloc(tlen); if (iph2->sendbuf == NULL) { plog(PLOG_INTERR, PLOGLOC, 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(isakmp_cookie_t)); memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(isakmp_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)); put_uint32(&isakmp->len, tlen); p = (char *)(isakmp + 1); /* create HASH payload */ if (hash != NULL) { gen = (struct isakmp_gen *)p; gen->np = np & 0xff; put_uint16(&gen->len, 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)) { rc_vchar_t *tmp; tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive, iph2->ivm->iv); VPTRINIT(iph2->sendbuf); if (tmp == NULL) goto err; iph2->sendbuf = tmp; } /* HDR*, HASH(1), N */ if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) { VPTRINIT(iph2->sendbuf); goto err; } plog(PLOG_DEBUG, PLOGLOC, 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; VPTRINIT(iph2->sendbuf); goto err; /* XXX */ end: if (hash) rc_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 ? */ rc_vchar_t * isakmp_add_pl_n(rc_vchar_t *buf0, uint8_t **np_p, int type, struct saproto *pr, rc_vchar_t *data) { rc_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 = rc_vrealloc(buf0, buf0->l + tlen); } else buf = rc_vmalloc(tlen); if (!buf) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get a payload buffer.\n"); return NULL; } n = (struct isakmp_pl_n *)(buf->v + oldlen); n->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&n->h.len, tlen); put_uint32(&n->doi, IPSEC_DOI); /* IPSEC DOI (1) */ n->proto_id = pr->proto_id; /* IPSEC AH/ESP/whatever*/ n->spi_size = pr->spisize; put_uint16(&n->type, type); memcpy((uint8_t *)(n + 1), &pr->spi, pr->spisize); 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(struct ph1handle *iph1, rc_vchar_t *msg) { struct isakmp_pl_n *n = NULL; unsigned int type; rc_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: rc_vfree(pbuf); return -1; } } rc_vfree(pbuf); if (!n) return -1; type = get_uint16(&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; case ISAKMP_NTYPE_R_U_THERE: isakmp_info_recv_r_u(iph1, (struct isakmp_pl_ru *)n, ((struct isakmp *)msg->v)->msgid); break; case ISAKMP_NTYPE_R_U_THERE_ACK: isakmp_info_recv_r_u_ack(iph1, (struct isakmp_pl_ru *)n, ((struct isakmp *)msg->v)->msgid); break; default: { uint32_t msgid = ((struct isakmp *)msg->v)->msgid; struct ph2handle *iph2; /* XXX there is a potential of dos attack. */ if (msgid == 0) { /* delete ph1 */ plog(PLOG_PROTOERR, PLOGLOC, 0, "delete phase1 handle.\n"); return -1; } else { iph2 = getph2bymsgid(iph1, msgid); if (iph2 == NULL) { plog(PLOG_PROTOERR, PLOGLOC, 0, "unknown notify message (%d), " "no phase2 handle found.\n", type); } else { /* delete ph2 */ unbindph12(iph2); remph2(iph2); delph2(iph2); } } } break; } /* get spi and allocate */ if (get_uint16(&n->h.len) < sizeof(*n) + n->spi_size) { plog(PLOG_PROTOERR, PLOGLOC, 0, "invalid spi_size in notification payload.\n"); return -1; } spi = val2str((char *)(n + 1), n->spi_size); plog(PLOG_DEBUG, PLOGLOC, 0, "notification message %d:%s, " "doi=%d proto_id=%d spi=%s(size=%d).\n", type, s_isakmp_notify_msg(type), get_uint32(&n->doi), n->proto_id, spi, n->spi_size); racoon_free(spi); return(0); } #if 0 static void purge_isakmp_spi(proto, spi, n) int proto; isakmp_index_t *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(PLOG_INFO, PLOGLOC, 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); } } #endif /* * 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(struct ph1handle *iph1) { plog(PLOG_INFO, PLOGLOC, 0, "INITIALCONTACT processing unimplemented"); #ifdef notyet struct ph2handle *ph2; struct ph2handle *next_ph2; struct saprop *pp; struct saproto *pr; plog(PLOG_INFO, PLOGLOC, 0, "processing INITIALCONTACT for %s->%s\n", rcs_sa2str(iph1->local), rcs_sa2str(iph1->remote)); for (ph2 = LIST_FIRST(&ph2tree); ph2; ph2 = next_ph2) { next_ph2 = LIST_NEXT(ph2, chain); #ifdef ENABLE_NATT /* * XXX RFC 3947 says that whe MUST NOT use IP+port to find old SAs * from this peer ! */ if(iph1->natt_flags & NAT_DETECTED){ if (CMPSADDR(iph1->local, ph2->src) == 0 && CMPSADDR(iph1->remote, ph2->dst) == 0) ; else if (CMPSADDR(iph1->remote, ph2->src) == 0 && CMPSADDR(iph1->local, ph2->dst) == 0) ; else continue; } else #endif /* If there is no NAT-T, we don't have to check addr + port... * XXX what about a configuration with a remote peers which is not * NATed, but which NATs some other peers ? * Here, the INITIAl-CONTACT would also flush all those NATed peers !! */ if (rcs_cmpsa_wop(iph1->local, ph2->src) == 0 && rcs_cmpsa_wop(iph1->remote, ph2->dst) == 0) ; else if (rcs_cmpsa_wop(iph1->remote, ph2->src) == 0 && rcs_cmpsa_wop(iph1->local, ph2->dst) == 0) ; else continue; pp = ph2->approval; if (! pp) { TRACE((PLOGLOC, "no negotiated protocols, skipping\n")); continue; } for (pr = pp->head; pr; pr = pr->next) { plog(PLOG_INFO, PLOGLOC, NULL, "purging proto=%d spi=%lu outbound.\n", pr->proto_id, ntohl(pr->spi_p)); delete_ipsec_sa(&ph2->sadb_request, ph2->src, ph2->dst, pr->proto_id, pr->spi_p); plog(PLOG_INFO, PLOGLOC, NULL, "purging proto=%d spi=%lu inbound.\n", pr->proto_id, ntohl(pr->spi)); delete_ipsec_sa(&ph2->sadb_request, ph2->dst, ph2->src, pr->proto_id, pr->spi); } destroy_ph2(ph2); } #endif } /* * handling to receive Deletion payload */ static int isakmp_info_recv_d(struct ph1handle *iph1, rc_vchar_t *msg) { struct isakmp_pl_d *d; int tlen, num_spi; rc_vchar_t *pbuf; struct isakmp_parse_t *pa, *pap; int protected = 0; union { uint32_t spi32; uint16_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(PLOG_PROTOERR, PLOGLOC, 0, "received next payload type %d " "in wrong place (must be the first payload).\n", pap->type); rc_vfree(pbuf); return -1; default: /* don't send information, see isakmp_ident_r1() */ plog(PLOG_PROTOERR, PLOGLOC, 0, "reject the packet, " "received unexpecting payload type %d.\n", pap->type); rc_vfree(pbuf); return 0; } } if (!protected) { plog(PLOG_PROTOERR, PLOGLOC, NULL, "delete payload is not proteted, " "ignored.\n"); rc_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 (get_uint32(&d->doi) != IPSEC_DOI) { plog(PLOG_PROTOERR, PLOGLOC, 0, "delete payload with invalid doi:%d.\n", get_uint32(&d->doi)); #ifdef ENABLE_HYBRID /* * At deconnexion time, Cisco VPN client does this * with a zero DOI. Don't give up in that situation. */ if (((iph1->mode_cfg->flags & ISAKMP_CFG_VENDORID_UNITY) == 0) || (d->doi != 0)) continue; #else continue; #endif } num_spi = get_uint16(&d->num_spi); tlen = get_uint16(&d->h.len) - sizeof(struct isakmp_pl_d); if (tlen != num_spi * d->spi_size) { plog(PLOG_PROTOERR, PLOGLOC, 0, "deletion payload with invalid length.\n"); rc_vfree(pbuf); return -1; } switch (d->proto_id) { case IPSECDOI_PROTO_ISAKMP: if (d->spi_size != sizeof(isakmp_index_t)) { plog(PLOG_PROTOERR, PLOGLOC, 0, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } if (iph1->scr) SCHED_KILL(iph1->scr); purge_remote(iph1); break; case IPSECDOI_PROTO_IPSEC_AH: case IPSECDOI_PROTO_IPSEC_ESP: if (d->spi_size != sizeof(uint32_t)) { plog(PLOG_PROTOERR, PLOGLOC, 0, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } EVT_PUSH(iph1->local, iph1->remote, EVTT_PEER_DELETE, NULL); purge_ipsec_spi(iph1, iph1->remote, d->proto_id, (uint32_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(PLOG_PROTOERR, PLOGLOC, 0, "delete payload with strange spi " "size %d(proto_id:%d)\n", d->spi_size, d->proto_id); continue; } purge_ipsec_spi(iph1, iph1->remote, d->proto_id, &spi.spi32, num_spi); break; default: plog(PLOG_PROTOERR, PLOGLOC, 0, "deletion message received, " "invalid proto_id: %d\n", d->proto_id); continue; } plog(PLOG_DEBUG, PLOGLOC, NULL, "purged SAs.\n"); } rc_vfree(pbuf); return 0; } void isakmp_check_notify(struct isakmp_gen *gen, /* points to Notify payload */ struct ph1handle *iph1) { struct isakmp_pl_n *notify = (struct isakmp_pl_n *)gen; plog(PLOG_DEBUG, PLOGLOC, 0, "Notify Message received\n"); switch (get_uint16(¬ify->type)) { case ISAKMP_NTYPE_CONNECTED: case ISAKMP_NTYPE_RESPONDER_LIFETIME: case ISAKMP_NTYPE_REPLAY_STATUS: case ISAKMP_NTYPE_HEARTBEAT: #ifdef ENABLE_HYBRID case ISAKMP_NTYPE_UNITY_HEARTBEAT: #endif plog(PLOG_PROTOWARN, PLOGLOC, 0, "ignore %s notification.\n", s_isakmp_notify_msg(get_uint16(¬ify->type))); break; case ISAKMP_NTYPE_INITIAL_CONTACT: plog(PLOG_PROTOWARN, PLOGLOC, 0, "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(PLOG_PROTOERR, PLOGLOC, 0, "received unknown notification type %s.\n", s_isakmp_notify_msg(get_uint16(¬ify->type))); } return; } static int isakmp_info_recv_r_u (struct ph1handle *iph1, struct isakmp_pl_ru *ru, uint32_t msgid) { struct isakmp_pl_ru *ru_ack; rc_vchar_t *payload = NULL; int tlen; int error = 0; plog(PLOG_DEBUG, PLOGLOC, 0, "DPD R-U-There received\n"); /* XXX should compare cookies with iph1->index? Or is this already done by calling function? */ tlen = sizeof(*ru_ack); payload = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer to send.\n"); return errno; } ru_ack = (struct isakmp_pl_ru *)payload->v; ru_ack->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&ru_ack->h.len, tlen); put_uint32(&ru_ack->doi, IPSEC_DOI); put_uint16(&ru_ack->type, ISAKMP_NTYPE_R_U_THERE_ACK); ru_ack->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ? */ ru_ack->spi_size = sizeof(isakmp_index_t); memcpy(ru_ack->i_ck, ru->i_ck, sizeof(isakmp_cookie_t)); memcpy(ru_ack->r_ck, ru->r_ck, sizeof(isakmp_cookie_t)); ru_ack->data = ru->data; /* XXX Should we do FLAG_A ? */ error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, ISAKMP_FLAG_E); rc_vfree(payload); plog(PLOG_DEBUG, PLOGLOC, NULL, "received a valid R-U-THERE, ACK sent\n"); /* Should we mark tunnel as active ? */ return error; } static int isakmp_info_recv_r_u_ack (struct ph1handle *iph1, struct isakmp_pl_ru *ru, uint32_t msgid) { plog(PLOG_DEBUG, PLOGLOC, 0, "DPD R-U-There-Ack received\n"); /* XXX Maintain window of acceptable sequence numbers ? * => ru->data <= iph2->dpd_seq && * ru->data >= iph2->dpd_seq - iph2->dpd_fails ? */ if (get_uint32(&ru->data) != iph1->dpd_seq-1) { plog(PLOG_PROTOERR, PLOGLOC, 0, "Wrong DPD sequence number (%d, %d expected).\n", get_uint32(&ru->data), iph1->dpd_seq-1); return 0; } if (memcmp(ru->i_ck, iph1->index.i_ck, sizeof(isakmp_cookie_t)) || memcmp(ru->r_ck, iph1->index.r_ck, sizeof(isakmp_cookie_t))) { plog(PLOG_PROTOERR, PLOGLOC, 0, "Cookie mismatch in DPD ACK!.\n"); return 0; } iph1->dpd_fails = 0; /* Useless ??? */ iph1->dpd_lastack = time(NULL); plog(PLOG_DEBUG, PLOGLOC, NULL, "received an R-U-THERE-ACK\n"); return 0; } /* * send Delete payload (for ISAKMP SA) in Informational exchange. */ static void isakmp_info_send_r_u(void *arg) { struct ph2handle *iph2 = arg; struct ph1handle *iph1; /* create R-U-THERE payload */ struct isakmp_pl_ru *ru; rc_vchar_t *payload = NULL; int tlen; int error = 0; plog(PLOG_DEBUG, PLOGLOC, 0, "DPD monitoring....\n"); iph1 = getph1byaddr(iph2->src, iph2->dst); if (!iph1) { plog(PLOG_DEBUG, PLOGLOC, 0, "can't find iph1\n"); return; } SCHED_KILL(iph1->dpd_r_u); if (iph1->dpd_fails >= ikev1_dpd_maxfails(iph1->rmconf)) { EVT_PUSH(iph1->local, iph1->remote, EVTT_DPD_TIMEOUT, NULL); purge_remote(iph1); plog(PLOG_DEBUG, PLOGLOC, 0, "DPD: remote seems to be dead\n"); /* Do not reschedule here: phase1 is deleted, * DPD will be reactivated when a new ph1 will be negociated */ return; } /* Check recent activity to avoid useless sends... */ if (iph2->status != PHASE2ST_ESTABLISHED) return; /* * DPD is necessary only when peer is idle AND * self has packets to send */ if (iph2->prev_peercount != iph2->cur_peercount || iph2->prev_selfcount == iph2->cur_selfcount) { isakmp_sched_r_u(iph2, 0); return; } /* XXX: why do we have a NULL LIST_FIRST even when a Phase2 exists ??? */ #if 0 if (LIST_FIRST(&iph1->ph2tree) == NULL){ /* XXX: No Ph2 => no need to test ph1 ? */ /* Reschedule the r_u_there.... XXX: reschedule when a new ph2 ? */ isakmp_sched_r_u(iph2, 0); plog(PLOG_DEBUG, PLOGLOC, 0, "no phase2 handler, rescheduling send_r_u (%d).\n", iph1->rmconf->dpd_interval); return 0; } #endif tlen = sizeof(*ru); payload = rc_vmalloc(tlen); if (payload == NULL) { plog(PLOG_INTERR, PLOGLOC, NULL, "failed to get buffer for payload.\n"); return; } ru = (struct isakmp_pl_ru *)payload->v; ru->h.np = ISAKMP_NPTYPE_NONE; put_uint16(&ru->h.len, tlen); put_uint32(&ru->doi, IPSEC_DOI); put_uint16(&ru->type, ISAKMP_NTYPE_R_U_THERE); ru->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ?*/ ru->spi_size = sizeof(isakmp_index_t); memcpy(ru->i_ck, iph1->index.i_ck, sizeof(isakmp_cookie_t)); memcpy(ru->r_ck, iph1->index.r_ck, sizeof(isakmp_cookie_t)); if (iph1->dpd_seq == 0){ /* generate a random seq which is not too big */ iph1->dpd_seq = eay_random_uint32() & 0x0fff; } put_uint32(&ru->data, iph1->dpd_seq); error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0); rc_vfree(payload); plog(PLOG_DEBUG, PLOGLOC, 0, "DPD R-U-There sent (%d)\n", error); /* will be decreased if ACK received... */ iph1->dpd_fails++; /* XXX should be increased only when ACKed ? */ iph1->dpd_seq++; /* Reschedule the r_u_there with a short delay, * will be deleted/rescheduled if ACK received before */ if (iph1->dpd_lastack < time(NULL) - ikev1_dpd_interval(iph1->rmconf)) { isakmp_sched_r_u(iph2, 1); } else { isakmp_sched_r_u(iph2, 0); } plog(PLOG_DEBUG, PLOGLOC, 0, "rescheduling send_r_u (%d).\n", ikev1_dpd_retry(iph1->rmconf)); } /* Schedule a new R-U-THERE */ int isakmp_sched_r_u(struct ph2handle *iph2, int retry) { struct ph1handle *iph1; if(iph2 == NULL) return 1; iph1 = getph1byaddr(iph2->src, iph2->dst); if (!iph1 || !iph1->rmconf) return 1; if (iph2->status != PHASE2ST_ESTABLISHED) { return 0; } if(iph1->dpd_support == 0 || ikev1_dpd_interval(iph1->rmconf) == 0) return 0; pk_sendget(iph2, 0); pk_sendget(iph2, 1); if(retry) iph1->dpd_r_u = sched_new(ikev1_dpd_retry(iph1->rmconf), isakmp_info_send_r_u, iph2); else sched_new(ikev1_dpd_interval(iph1->rmconf), isakmp_info_send_r_u, iph2); return 0; }