/* $OpenBSD: ikev2.c,v 1.114 2014/07/09 12:05:01 markus Exp $ */ /* * Copyright (c) 2010-2013 Reyk Floeter * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "iked.h" #include "ikev2.h" #include "eap.h" #include "dh.h" int ikev2_dispatch_parent(int, struct privsep_proc *, struct imsg *); int ikev2_dispatch_ikev1(int, struct privsep_proc *, struct imsg *); int ikev2_dispatch_cert(int, struct privsep_proc *, struct imsg *); struct iked_sa * ikev2_getimsgdata(struct iked *, struct imsg *, struct iked_sahdr *, u_int8_t *, u_int8_t **, size_t *); void ikev2_recv(struct iked *, struct iked_message *); int ikev2_ike_auth_recv(struct iked *, struct iked_sa *, struct iked_message *); int ikev2_ike_auth(struct iked *, struct iked_sa *); void ikev2_init_recv(struct iked *, struct iked_message *, struct ike_header *); int ikev2_init_ike_sa_peer(struct iked *, struct iked_policy *, struct iked_addr *); int ikev2_init_ike_auth(struct iked *, struct iked_sa *); int ikev2_init_auth(struct iked *, struct iked_message *); int ikev2_init_done(struct iked *, struct iked_sa *); void ikev2_resp_recv(struct iked *, struct iked_message *, struct ike_header *); int ikev2_resp_ike_sa_init(struct iked *, struct iked_message *); int ikev2_resp_ike_auth(struct iked *, struct iked_sa *); int ikev2_resp_ike_eap(struct iked *, struct iked_sa *, struct ibuf *); int ikev2_send_create_child_sa(struct iked *, struct iked_sa *, struct iked_spi *, u_int8_t); int ikev2_ikesa_enable(struct iked *, struct iked_sa *, struct iked_sa *); void ikev2_ikesa_delete(struct iked *, struct iked_sa *, int); int ikev2_init_create_child_sa(struct iked *, struct iked_message *); int ikev2_resp_create_child_sa(struct iked *, struct iked_message *); void ikev2_ike_sa_rekey(struct iked *, void *); void ikev2_ike_sa_timeout(struct iked *env, void *); void ikev2_ike_sa_alive(struct iked *, void *); int ikev2_sa_initiator(struct iked *, struct iked_sa *, struct iked_sa *, struct iked_message *); int ikev2_sa_responder(struct iked *, struct iked_sa *, struct iked_sa *, struct iked_message *); int ikev2_sa_initiator_dh(struct iked_sa *, struct iked_message *, u_int); int ikev2_sa_responder_dh(struct iked_kex *, struct iked_proposals *, struct iked_message *, u_int); void ikev2_sa_cleanup_dh(struct iked_sa *); int ikev2_sa_keys(struct iked *, struct iked_sa *, struct ibuf *); int ikev2_sa_tag(struct iked_sa *, struct iked_id *); int ikev2_set_sa_proposal(struct iked_sa *, struct iked_policy *, u_int); int ikev2_childsa_negotiate(struct iked *, struct iked_sa *, struct iked_kex *, struct iked_proposals *, int, int); int ikev2_match_proposals(struct iked_proposal *, struct iked_proposal *, struct iked_transform **); int ikev2_valid_proposal(struct iked_proposal *, struct iked_transform **, struct iked_transform **, int *); ssize_t ikev2_add_proposals(struct iked *, struct iked_sa *, struct ibuf *, struct iked_proposals *, u_int8_t, int, int); ssize_t ikev2_add_cp(struct iked *, struct iked_sa *, struct ibuf *); ssize_t ikev2_add_transform(struct ibuf *, u_int8_t, u_int8_t, u_int16_t, u_int16_t); ssize_t ikev2_add_ts(struct ibuf *, struct ikev2_payload **, ssize_t, struct iked_sa *, int); ssize_t ikev2_add_certreq(struct ibuf *, struct ikev2_payload **, ssize_t, struct ibuf *, u_int8_t); ssize_t ikev2_add_ipcompnotify(struct iked *, struct ibuf *, struct ikev2_payload **, ssize_t, struct iked_sa *); ssize_t ikev2_add_ts_payload(struct ibuf *, u_int, struct iked_sa *); int ikev2_add_data(struct ibuf *, void *, size_t); int ikev2_add_buf(struct ibuf *buf, struct ibuf *); int ikev2_ipcomp_enable(struct iked *, struct iked_sa *); void ikev2_ipcomp_csa_free(struct iked *, struct iked_childsa *); int ikev2_cp_setaddr(struct iked *, struct iked_sa *); int ikev2_cp_fixaddr(struct iked_sa *, struct iked_addr *, struct iked_addr *); static struct privsep_proc procs[] = { { "parent", PROC_PARENT, ikev2_dispatch_parent }, { "ikev1", PROC_IKEV1, ikev2_dispatch_ikev1 }, { "certstore", PROC_CERT, ikev2_dispatch_cert } }; pid_t ikev2(struct privsep *ps, struct privsep_proc *p) { return (proc_run(ps, p, procs, nitems(procs), NULL, NULL)); } int ikev2_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg) { struct iked *env = p->p_env; switch (imsg->hdr.type) { case IMSG_CTL_RESET: return (config_getreset(env, imsg)); case IMSG_CTL_COUPLE: case IMSG_CTL_DECOUPLE: return (config_getcoupled(env, imsg->hdr.type)); case IMSG_CTL_ACTIVE: case IMSG_CTL_PASSIVE: if (config_getmode(env, imsg->hdr.type) == -1) return (0); /* ignore error */ timer_set(env, &env->sc_inittmr, ikev2_init_ike_sa, NULL); timer_add(env, &env->sc_inittmr, IKED_INITIATOR_INITIAL); return (0); case IMSG_UDP_SOCKET: return (config_getsocket(env, imsg, ikev2_msg_cb)); case IMSG_PFKEY_SOCKET: return (config_getpfkey(env, imsg)); case IMSG_CFG_POLICY: return (config_getpolicy(env, imsg)); case IMSG_CFG_USER: return (config_getuser(env, imsg)); case IMSG_COMPILE: return (config_getcompile(env, imsg)); default: break; } return (-1); } int ikev2_dispatch_ikev1(int fd, struct privsep_proc *p, struct imsg *imsg) { struct iked *env = p->p_env; struct iked_message msg; u_int8_t *buf; ssize_t len; switch (imsg->hdr.type) { case IMSG_IKE_MESSAGE: log_debug("%s: message", __func__); IMSG_SIZE_CHECK(imsg, &msg); memcpy(&msg, imsg->data, sizeof(msg)); len = IMSG_DATA_SIZE(imsg) - sizeof(msg); buf = (u_int8_t *)imsg->data + sizeof(msg); if (len <= 0 || (msg.msg_data = ibuf_new(buf, len)) == NULL) { log_debug("%s: short message", __func__); return (0); } log_debug("%s: message length %zd", __func__, len); ikev2_recv(env, &msg); ikev2_msg_cleanup(env, &msg); return (0); default: break; } return (-1); } int ikev2_dispatch_cert(int fd, struct privsep_proc *p, struct imsg *imsg) { struct iked *env = p->p_env; struct iked_sahdr sh; struct iked_sa *sa; u_int8_t type; u_int8_t *ptr; size_t len; struct iked_id *id = NULL; int ignore = 0; switch (imsg->hdr.type) { case IMSG_CERTREQ: IMSG_SIZE_CHECK(imsg, &type); ptr = imsg->data; memcpy(&type, ptr, sizeof(type)); ptr += sizeof(type); ibuf_release(env->sc_certreq); env->sc_certreqtype = type; env->sc_certreq = ibuf_new(ptr, IMSG_DATA_SIZE(imsg) - sizeof(type)); log_debug("%s: updated local CERTREQ type %s length %zu", __func__, print_map(type, ikev2_cert_map), ibuf_length(env->sc_certreq)); break; case IMSG_CERTVALID: case IMSG_CERTINVALID: memcpy(&sh, imsg->data, sizeof(sh)); memcpy(&type, (u_int8_t *)imsg->data + sizeof(sh), sizeof(type)); /* Ignore invalid or unauthenticated SAs */ if ((sa = sa_lookup(env, sh.sh_ispi, sh.sh_rspi, sh.sh_initiator)) == NULL || sa->sa_state < IKEV2_STATE_EAP) break; if (imsg->hdr.type == IMSG_CERTVALID) { log_debug("%s: peer certificate is valid", __func__); sa_stateflags(sa, IKED_REQ_CERTVALID); sa_state(env, sa, IKEV2_STATE_VALID); } else { log_warnx("%s: peer certificate is invalid", __func__); } if (ikev2_ike_auth(env, sa) != 0) log_debug("%s: failed to send ike auth", __func__); break; case IMSG_CERT: if ((sa = ikev2_getimsgdata(env, imsg, &sh, &type, &ptr, &len)) == NULL) { log_debug("%s: invalid cert reply", __func__); break; } /* * Ignore the message if we already got a valid certificate. * This might happen if the peer sent multiple CERTREQs. */ if (sa->sa_stateflags & IKED_REQ_CERT || type == IKEV2_CERT_NONE) ignore = 1; log_debug("%s: cert type %s length %zu, %s", __func__, print_map(type, ikev2_cert_map), len, ignore ? "ignored" : "ok"); if (ignore) break; if (sh.sh_initiator) id = &sa->sa_icert; else id = &sa->sa_rcert; id->id_type = type; id->id_offset = 0; ibuf_release(id->id_buf); id->id_buf = NULL; if (len <= 0 || (id->id_buf = ibuf_new(ptr, len)) == NULL) { log_debug("%s: failed to get cert payload", __func__); break; } sa_stateflags(sa, IKED_REQ_CERT); if (ikev2_ike_auth(env, sa) != 0) log_debug("%s: failed to send ike auth", __func__); break; case IMSG_AUTH: if ((sa = ikev2_getimsgdata(env, imsg, &sh, &type, &ptr, &len)) == NULL) { log_debug("%s: invalid auth reply", __func__); break; } if (sa_stateok(sa, IKEV2_STATE_VALID)) { log_warnx("%s: ignoring AUTH in state %s", __func__, print_map(sa->sa_state, ikev2_state_map)); break; } log_debug("%s: AUTH type %d len %zu", __func__, type, len); id = &sa->sa_localauth; id->id_type = type; id->id_offset = 0; ibuf_release(id->id_buf); if (type != IKEV2_AUTH_NONE) { if (len <= 0 || (id->id_buf = ibuf_new(ptr, len)) == NULL) { log_debug("%s: failed to get auth payload", __func__); break; } } sa_stateflags(sa, IKED_REQ_AUTH); /* Switch in case we already have certvalid or authvalid */ sa_state(env, sa, IKEV2_STATE_VALID); if (ikev2_ike_auth(env, sa) != 0) log_debug("%s: failed to send ike auth", __func__); break; default: return (-1); } return (0); } struct iked_sa * ikev2_getimsgdata(struct iked *env, struct imsg *imsg, struct iked_sahdr *sh, u_int8_t *type, u_int8_t **buf, size_t *size) { u_int8_t *ptr; size_t len; struct iked_sa *sa; IMSG_SIZE_CHECK(imsg, sh); ptr = imsg->data; len = IMSG_DATA_SIZE(imsg) - sizeof(*sh) - sizeof(*type); memcpy(sh, ptr, sizeof(*sh)); memcpy(type, ptr + sizeof(*sh), sizeof(*type)); sa = sa_lookup(env, sh->sh_ispi, sh->sh_rspi, sh->sh_initiator); log_debug("%s: imsg %d rspi %s ispi %s initiator %d sa %s" " type %d data length %zd", __func__, imsg->hdr.type, print_spi(sh->sh_rspi, 8), print_spi(sh->sh_ispi, 8), sh->sh_initiator, sa == NULL ? "invalid" : "valid", *type, len); if (sa == NULL) return (NULL); *buf = ptr + sizeof(*sh) + sizeof(*type); *size = len; return (sa); } void ikev2_recv(struct iked *env, struct iked_message *msg) { struct ike_header *hdr; struct iked_message *m; struct iked_sa *sa; u_int initiator, flag = 0; hdr = ibuf_seek(msg->msg_data, msg->msg_offset, sizeof(*hdr)); if (hdr == NULL || ibuf_size(msg->msg_data) < (betoh32(hdr->ike_length) - msg->msg_offset)) return; initiator = (hdr->ike_flags & IKEV2_FLAG_INITIATOR) ? 0 : 1; msg->msg_response = (hdr->ike_flags & IKEV2_FLAG_RESPONSE) ? 1 : 0; msg->msg_sa = sa_lookup(env, betoh64(hdr->ike_ispi), betoh64(hdr->ike_rspi), initiator); msg->msg_msgid = betoh32(hdr->ike_msgid); if (policy_lookup(env, msg) != 0) return; log_info("%s: %s %s from %s %s to %s policy '%s' id %u, %ld bytes", __func__, print_map(hdr->ike_exchange, ikev2_exchange_map), msg->msg_response ? "response" : "request", initiator ? "responder" : "initiator", print_host((struct sockaddr *)&msg->msg_peer, NULL, 0), print_host((struct sockaddr *)&msg->msg_local, NULL, 0), msg->msg_policy->pol_name, msg->msg_msgid, ibuf_length(msg->msg_data)); log_debug("%s: ispi %s rspi %s", __func__, print_spi(betoh64(hdr->ike_ispi), 8), print_spi(betoh64(hdr->ike_rspi), 8)); if ((sa = msg->msg_sa) == NULL) goto done; if (hdr->ike_exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA) flag = IKED_REQ_CHILDSA; if (hdr->ike_exchange == IKEV2_EXCHANGE_INFORMATIONAL) flag = IKED_REQ_INF; if (msg->msg_response) { if (msg->msg_msgid > sa->sa_reqid) return; if (hdr->ike_exchange != IKEV2_EXCHANGE_INFORMATIONAL && !ikev2_msg_lookup(env, &sa->sa_requests, msg, hdr)) return; if (flag) { if ((sa->sa_stateflags & flag) == 0) return; /* * We have initiated this exchange, even if * we are not the initiator of the IKE SA. */ initiator = 1; } /* * There's no need to keep the request around anymore */ if ((m = ikev2_msg_lookup(env, &sa->sa_requests, msg, hdr))) ikev2_msg_dispose(env, &sa->sa_requests, m); } else { if (msg->msg_msgid < sa->sa_msgid) return; if (flag) initiator = 0; /* * See if we have responded to this request before */ if ((m = ikev2_msg_lookup(env, &sa->sa_responses, msg, hdr))) { if (ikev2_msg_retransmit_response(env, sa, m)) { log_warn("%s: failed to retransmit a " "response", __func__); sa_free(env, sa); } return; } else if (sa->sa_msgid_set && msg->msg_msgid == sa->sa_msgid) { /* * Response is being worked on, most likely we're * waiting for the CA process to get back to us */ return; } /* * If it's a new request, make sure to update the peer's * message ID and dispose of all previous responses. * We need to set sa_msgid_set in order to distinguish between * "last msgid was 0" and "msgid not set yet". */ sa->sa_msgid = msg->msg_msgid; sa->sa_msgid_set = 1; ikev2_msg_prevail(env, &sa->sa_responses, msg); } if (sa_address(sa, &sa->sa_peer, &msg->msg_peer, sa->sa_hdr.sh_initiator) == -1 || sa_address(sa, &sa->sa_local, &msg->msg_local, sa->sa_hdr.sh_initiator) == -1) return; sa->sa_fd = msg->msg_fd; log_debug("%s: updated SA to peer %s local %s", __func__, print_host((struct sockaddr *)&sa->sa_peer.addr, NULL, 0), print_host((struct sockaddr *)&sa->sa_local.addr, NULL, 0)); done: if (initiator) ikev2_init_recv(env, msg, hdr); else ikev2_resp_recv(env, msg, hdr); if (sa != NULL && sa->sa_state == IKEV2_STATE_CLOSED) { log_debug("%s: closing SA", __func__); sa_free(env, sa); } } int ikev2_ike_auth_recv(struct iked *env, struct iked_sa *sa, struct iked_message *msg) { struct iked_id *id, *certid; struct ibuf *authmsg; struct iked_auth ikeauth; struct iked_policy *policy = sa->sa_policy; int ret = -1; if (sa->sa_hdr.sh_initiator) { id = &sa->sa_rid; certid = &sa->sa_rcert; } else { id = &sa->sa_iid; certid = &sa->sa_icert; } /* try to relookup the policy based on the peerid */ if (msg->msg_id.id_type && !sa->sa_hdr.sh_initiator) { struct iked_policy *old = sa->sa_policy; sa->sa_policy = NULL; if (policy_lookup(env, msg) == 0 && msg->msg_policy && msg->msg_policy != old) { log_debug("%s: policy switch %p/%s to %p/%s", __func__, old, old->pol_name, msg->msg_policy, msg->msg_policy->pol_name); RB_REMOVE(iked_sapeers, &old->pol_sapeers, sa); if (RB_INSERT(iked_sapeers, &msg->msg_policy->pol_sapeers, sa)) { /* failed, restore */ log_debug("%s: conflicting sa", __func__); RB_INSERT(iked_sapeers, &old->pol_sapeers, sa); msg->msg_policy = old; } else policy_unref(env, old); policy = sa->sa_policy = msg->msg_policy; } else { /* restore */ msg->msg_policy = sa->sa_policy = old; } } if (msg->msg_id.id_type) { memcpy(id, &msg->msg_id, sizeof(*id)); bzero(&msg->msg_id, sizeof(msg->msg_id)); if (!sa->sa_hdr.sh_initiator) { if ((authmsg = ikev2_msg_auth(env, sa, !sa->sa_hdr.sh_initiator)) == NULL) { log_debug("%s: failed to get response " "auth data", __func__); return (-1); } ca_setauth(env, sa, authmsg, PROC_CERT); ibuf_release(authmsg); } } if (msg->msg_cert.id_type) { memcpy(certid, &msg->msg_cert, sizeof(*certid)); bzero(&msg->msg_cert, sizeof(msg->msg_cert)); ca_setcert(env, &sa->sa_hdr, id, certid->id_type, ibuf_data(certid->id_buf), ibuf_length(certid->id_buf), PROC_CERT); } if (msg->msg_auth.id_type) { memcpy(&ikeauth, &policy->pol_auth, sizeof(ikeauth)); if (policy->pol_auth.auth_eap && sa->sa_eapmsk != NULL) { /* * The initiator EAP auth is a PSK derived * from the EAP-specific MSK */ ikeauth.auth_method = IKEV2_AUTH_SHARED_KEY_MIC; /* Copy session key as PSK */ memcpy(ikeauth.auth_data, ibuf_data(sa->sa_eapmsk), ibuf_size(sa->sa_eapmsk)); ikeauth.auth_length = ibuf_size(sa->sa_eapmsk); } if (msg->msg_auth.id_type != ikeauth.auth_method) { log_warnx("%s: unexpected auth method %s", __func__, print_map(ikeauth.auth_method, ikev2_auth_map)); return (-1); } if ((authmsg = ikev2_msg_auth(env, sa, sa->sa_hdr.sh_initiator)) == NULL) { log_debug("%s: failed to get auth data", __func__); return (-1); } ret = ikev2_msg_authverify(env, sa, &ikeauth, ibuf_data(msg->msg_auth.id_buf), ibuf_length(msg->msg_auth.id_buf), authmsg); ibuf_release(authmsg); if (ret != 0) { log_debug("%s: ikev2_msg_authverify failed", __func__); return (-1); } if (sa->sa_eapmsk != NULL) { if ((authmsg = ikev2_msg_auth(env, sa, !sa->sa_hdr.sh_initiator)) == NULL) { log_debug("%s: failed to get auth data", __func__); return (-1); } /* XXX 2nd AUTH for EAP messages */ ret = ikev2_msg_authsign(env, sa, &ikeauth, authmsg); ibuf_release(authmsg); if (ret != 0) { /* XXX */ return (-1); } /* ikev2_msg_authverify verified AUTH */ sa_stateflags(sa, IKED_REQ_AUTHVALID); sa_stateflags(sa, IKED_REQ_EAPVALID); sa_state(env, sa, IKEV2_STATE_EAP_VALID); } } if (!TAILQ_EMPTY(&msg->msg_proposals)) { if (ikev2_sa_negotiate(&sa->sa_proposals, &sa->sa_policy->pol_proposals, &msg->msg_proposals) != 0) { log_debug("%s: no proposal chosen", __func__); msg->msg_error = IKEV2_N_NO_PROPOSAL_CHOSEN; return (-1); } else sa_stateflags(sa, IKED_REQ_SA); } return ikev2_ike_auth(env, sa); } int ikev2_ike_auth(struct iked *env, struct iked_sa *sa) { if (sa->sa_hdr.sh_initiator) { if (sa_stateok(sa, IKEV2_STATE_AUTH_SUCCESS)) return (ikev2_init_done(env, sa)); else return (ikev2_init_ike_auth(env, sa)); } return (ikev2_resp_ike_auth(env, sa)); } void ikev2_init_recv(struct iked *env, struct iked_message *msg, struct ike_header *hdr) { struct iked_sa *sa; in_port_t port; struct iked_socket *sock; if (ikev2_msg_valid_ike_sa(env, hdr, msg) == -1) { log_debug("%s: unknown SA", __func__); return; } sa = msg->msg_sa; switch (hdr->ike_exchange) { case IKEV2_EXCHANGE_IKE_SA_INIT: /* Update the SPIs */ if ((sa = sa_new(env, betoh64(hdr->ike_ispi), betoh64(hdr->ike_rspi), 1, NULL)) == NULL || sa != msg->msg_sa) { log_debug("%s: invalid new SA", __func__); if (sa) sa_free(env, sa); } break; case IKEV2_EXCHANGE_IKE_AUTH: case IKEV2_EXCHANGE_CREATE_CHILD_SA: if (ikev2_msg_valid_ike_sa(env, hdr, msg) == -1) return; break; case IKEV2_EXCHANGE_INFORMATIONAL: break; default: log_debug("%s: unsupported exchange: %s", __func__, print_map(hdr->ike_exchange, ikev2_exchange_map)); return; } if (ikev2_pld_parse(env, hdr, msg, msg->msg_offset) != 0) { log_debug("%s: failed to parse message", __func__); return; } if (!ikev2_msg_frompeer(msg)) return; if (sa->sa_udpencap && sa->sa_natt == 0 && (sock = ikev2_msg_getsocket(env, sa->sa_local.addr_af, 1)) != NULL) { /* * Update address information and use the NAT-T * port and socket, if available. */ port = htons(socket_getport( (struct sockaddr *)&sock->sock_addr)); sa->sa_local.addr_port = port; sa->sa_peer.addr_port = port; (void)socket_af((struct sockaddr *)&sa->sa_local.addr, port); (void)socket_af((struct sockaddr *)&sa->sa_peer.addr, port); msg->msg_fd = sa->sa_fd = sock->sock_fd; msg->msg_sock = sock; sa->sa_natt = 1; log_debug("%s: NAT detected, updated SA to " "peer %s local %s", __func__, print_host((struct sockaddr *)&sa->sa_peer.addr, NULL, 0), print_host((struct sockaddr *)&sa->sa_local.addr, NULL, 0)); } switch (hdr->ike_exchange) { case IKEV2_EXCHANGE_IKE_SA_INIT: (void)ikev2_init_auth(env, msg); break; case IKEV2_EXCHANGE_IKE_AUTH: (void)ikev2_ike_auth_recv(env, sa, msg); break; case IKEV2_EXCHANGE_CREATE_CHILD_SA: (void)ikev2_init_create_child_sa(env, msg); break; case IKEV2_EXCHANGE_INFORMATIONAL: sa->sa_stateflags &= ~IKED_REQ_INF; break; default: log_debug("%s: exchange %s not implemented", __func__, print_map(hdr->ike_exchange, ikev2_exchange_map)); break; } } void ikev2_init_ike_sa(struct iked *env, void *arg) { struct iked_policy *pol; TAILQ_FOREACH(pol, &env->sc_policies, pol_entry) { if ((pol->pol_flags & IKED_POLICY_ACTIVE) == 0) continue; if (sa_peer_lookup(pol, &pol->pol_peer.addr) != NULL) { log_debug("%s: \"%s\" is already active", __func__, pol->pol_name); continue; } log_debug("%s: initiating \"%s\"", __func__, pol->pol_name); if (ikev2_init_ike_sa_peer(env, pol, &pol->pol_peer)) log_debug("%s: failed to initiate with peer %s", __func__, print_host((struct sockaddr *)&pol->pol_peer.addr, NULL, 0)); } timer_set(env, &env->sc_inittmr, ikev2_init_ike_sa, NULL); timer_add(env, &env->sc_inittmr, IKED_INITIATOR_INTERVAL); } int ikev2_init_ike_sa_peer(struct iked *env, struct iked_policy *pol, struct iked_addr *peer) { struct sockaddr_storage ss; struct iked_message req; struct ike_header *hdr; struct ikev2_payload *pld; struct ikev2_keyexchange *ke; struct ikev2_notify *n; struct iked_sa *sa; struct ibuf *buf; struct group *group; u_int8_t *ptr; ssize_t len; int ret = -1; struct iked_socket *sock; in_port_t port; if ((sock = ikev2_msg_getsocket(env, peer->addr_af, 0)) == NULL) return (-1); /* Create a new initiator SA */ if ((sa = sa_new(env, 0, 0, 1, pol)) == NULL) return (-1); /* Pick peer's DH group if asked */ /* XXX free old sa_dhgroup ? */ sa->sa_dhgroup = pol->pol_peerdh; if (ikev2_sa_initiator(env, sa, NULL, NULL) == -1) goto done; if (pol->pol_local.addr.ss_family == AF_UNSPEC) { if (socket_getaddr(sock->sock_fd, &ss) == -1) goto done; } else memcpy(&ss, &pol->pol_local.addr, pol->pol_local.addr.ss_len); if ((buf = ikev2_msg_init(env, &req, &peer->addr, peer->addr.ss_len, &ss, ss.ss_len, 0)) == NULL) goto done; /* Inherit the port from the 1st send socket */ port = htons(socket_getport((struct sockaddr *)&sock->sock_addr)); (void)socket_af((struct sockaddr *)&req.msg_local, port); (void)socket_af((struct sockaddr *)&req.msg_peer, port); req.msg_fd = sock->sock_fd; req.msg_sa = sa; req.msg_sock = sock; req.msg_msgid = ikev2_msg_id(env, sa); /* IKE header */ if ((hdr = ikev2_add_header(buf, sa, req.msg_msgid, IKEV2_PAYLOAD_SA, IKEV2_EXCHANGE_IKE_SA_INIT, 0)) == NULL) goto done; /* SA payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((len = ikev2_add_proposals(env, sa, buf, &pol->pol_proposals, IKEV2_SAPROTO_IKE, sa->sa_hdr.sh_initiator, 0)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_KE) == -1) goto done; /* KE payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((ke = ibuf_advance(buf, sizeof(*ke))) == NULL) goto done; if ((group = sa->sa_dhgroup) == NULL) { log_debug("%s: invalid dh", __func__); goto done; } ke->kex_dhgroup = htobe16(group->id); if (ikev2_add_buf(buf, sa->sa_dhiexchange) == -1) goto done; len = sizeof(*ke) + dh_getlen(group); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONCE) == -1) goto done; /* NONCE payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if (ikev2_add_buf(buf, sa->sa_inonce) == -1) goto done; len = ibuf_size(sa->sa_inonce); if ((env->sc_opts & IKED_OPT_NONATT) == 0) { if (ntohs(port) == IKED_NATT_PORT) { /* Enforce NAT-T on the initiator side */ log_debug("%s: enforcing NAT-T", __func__); req.msg_natt = sa->sa_natt = 1; } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) goto done; /* NAT-T notify payloads */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((n = ibuf_advance(buf, sizeof(*n))) == NULL) goto done; n->n_type = htobe16(IKEV2_N_NAT_DETECTION_SOURCE_IP); len = ikev2_nat_detection(env, &req, NULL, 0, 0); if ((ptr = ibuf_advance(buf, len)) == NULL) goto done; if ((len = ikev2_nat_detection(env, &req, ptr, len, betoh16(n->n_type))) == -1) goto done; len += sizeof(*n); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) goto done; if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((n = ibuf_advance(buf, sizeof(*n))) == NULL) goto done; n->n_type = htobe16(IKEV2_N_NAT_DETECTION_DESTINATION_IP); len = ikev2_nat_detection(env, &req, NULL, 0, 0); if ((ptr = ibuf_advance(buf, len)) == NULL) goto done; if ((len = ikev2_nat_detection(env, &req, ptr, len, betoh16(n->n_type))) == -1) goto done; len += sizeof(*n); } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; if (ikev2_set_header(hdr, ibuf_size(buf) - sizeof(*hdr)) == -1) goto done; (void)ikev2_pld_parse(env, hdr, &req, 0); ibuf_release(sa->sa_1stmsg); if ((sa->sa_1stmsg = ibuf_dup(buf)) == NULL) { log_debug("%s: failed to copy 1st message", __func__); goto done; } memcpy(&sa->sa_polpeer, &pol->pol_peer, sizeof(sa->sa_polpeer)); if (RB_INSERT(iked_sapeers, &pol->pol_sapeers, sa)) { log_debug("%s: conflicting sa", __func__); goto done; } if ((ret = ikev2_msg_send(env, &req)) == 0) sa_state(env, sa, IKEV2_STATE_SA_INIT); done: if (ret == -1) { log_debug("%s: closing SA", __func__); sa_free(env, sa); } ikev2_msg_cleanup(env, &req); return (ret); } int ikev2_init_auth(struct iked *env, struct iked_message *msg) { struct iked_sa *sa = msg->msg_sa; struct ibuf *authmsg; if (sa == NULL) return (-1); if (ikev2_sa_initiator(env, sa, NULL, msg) == -1) { log_debug("%s: failed to get IKE keys", __func__); return (-1); } if ((authmsg = ikev2_msg_auth(env, sa, !sa->sa_hdr.sh_initiator)) == NULL) { log_debug("%s: failed to get auth data", __func__); return (-1); } if (ca_setauth(env, sa, authmsg, PROC_CERT) == -1) { log_debug("%s: failed to get cert", __func__); return (-1); } return (ikev2_init_ike_auth(env, sa)); } int ikev2_init_ike_auth(struct iked *env, struct iked_sa *sa) { struct iked_policy *pol = sa->sa_policy; struct ikev2_payload *pld; struct ikev2_cert *cert; struct ikev2_auth *auth; struct iked_id *id, *certid; struct ibuf *e = NULL; u_int8_t firstpayload; int ret = -1; ssize_t len; if (!sa_stateok(sa, IKEV2_STATE_SA_INIT)) return (0); if (!sa->sa_localauth.id_type) { log_debug("%s: no local auth", __func__); return (-1); } /* New encrypted message buffer */ if ((e = ibuf_static()) == NULL) goto done; id = &sa->sa_iid; certid = &sa->sa_icert; /* ID payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; firstpayload = IKEV2_PAYLOAD_IDi; if (ibuf_cat(e, id->id_buf) != 0) goto done; len = ibuf_size(id->id_buf); /* CERT payload */ if ((sa->sa_stateinit & IKED_REQ_CERT) && (certid->id_type != IKEV2_CERT_NONE)) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_CERT) == -1) goto done; if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((cert = ibuf_advance(e, sizeof(*cert))) == NULL) goto done; cert->cert_type = certid->id_type; if (ibuf_cat(e, certid->id_buf) != 0) goto done; len = ibuf_size(certid->id_buf) + sizeof(*cert); /* CERTREQ payload(s) */ if ((len = ikev2_add_certreq(e, &pld, len, env->sc_certreq, env->sc_certreqtype)) == -1) goto done; if (env->sc_certreqtype != pol->pol_certreqtype && (len = ikev2_add_certreq(e, &pld, len, NULL, pol->pol_certreqtype)) == -1) goto done; } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_AUTH) == -1) goto done; /* AUTH payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((auth = ibuf_advance(e, sizeof(*auth))) == NULL) goto done; auth->auth_method = sa->sa_localauth.id_type; if (ibuf_cat(e, sa->sa_localauth.id_buf) != 0) goto done; len = ibuf_size(sa->sa_localauth.id_buf) + sizeof(*auth); /* CP payload */ if (sa->sa_cp) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_CP) == -1) goto done; if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = ikev2_add_cp(env, sa, e)) == -1) goto done; } /* compression */ if ((pol->pol_flags & IKED_POLICY_IPCOMP) && (len = ikev2_add_ipcompnotify(env, e, &pld, len, sa)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_SA) == -1) goto done; /* SA payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = ikev2_add_proposals(env, sa, e, &pol->pol_proposals, 0, sa->sa_hdr.sh_initiator, 0)) == -1) goto done; if ((len = ikev2_add_ts(e, &pld, len, sa, 0)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_IKE_AUTH, firstpayload, 0); done: ibuf_release(e); return (ret); } int ikev2_init_done(struct iked *env, struct iked_sa *sa) { int ret; if (!sa_stateok(sa, IKEV2_STATE_VALID)) return (0); /* ignored */ ret = ikev2_childsa_negotiate(env, sa, &sa->sa_kex, &sa->sa_proposals, sa->sa_hdr.sh_initiator, 0); if (ret == 0) ret = ikev2_childsa_enable(env, sa); if (ret == 0) { sa_state(env, sa, IKEV2_STATE_ESTABLISHED); timer_set(env, &sa->sa_timer, ikev2_ike_sa_alive, sa); timer_add(env, &sa->sa_timer, IKED_IKE_SA_ALIVE_TIMEOUT); timer_set(env, &sa->sa_rekey, ikev2_ike_sa_rekey, sa); if (sa->sa_policy->pol_rekey) timer_add(env, &sa->sa_rekey, sa->sa_policy->pol_rekey); } if (ret) ikev2_childsa_delete(env, sa, 0, 0, NULL, 1); return (ret); } int ikev2_policy2id(struct iked_static_id *polid, struct iked_id *id, int srcid) { struct ikev2_id hdr; struct iked_static_id localpid; char idstr[IKED_ID_SIZE]; struct in_addr in4; struct in6_addr in6; X509_NAME *name = NULL; u_int8_t *p; size_t len; /* Fixup the local Id if not specified */ if (srcid && polid->id_type == 0) { polid = &localpid; bzero(polid, sizeof(*polid)); /* Create a default local ID based on our FQDN */ polid->id_type = IKEV2_ID_FQDN; if (gethostname((char *)polid->id_data, sizeof(polid->id_data)) != 0) return (-1); polid->id_offset = 0; polid->id_length = strlen((char *)polid->id_data); /* excluding NUL */ } if (!polid->id_length) return (-1); /* Create an IKEv2 ID payload */ bzero(&hdr, sizeof(hdr)); hdr.id_type = id->id_type = polid->id_type; id->id_offset = sizeof(hdr); if ((id->id_buf = ibuf_new(&hdr, sizeof(hdr))) == NULL) return (-1); switch (id->id_type) { case IKEV2_ID_IPV4: if (inet_pton(AF_INET, (char *)polid->id_data, &in4) != 1 || ibuf_add(id->id_buf, &in4, sizeof(in4)) != 0) { ibuf_release(id->id_buf); return (-1); } break; case IKEV2_ID_IPV6: if (inet_pton(AF_INET6, (char *)polid->id_data, &in6) != 1 || ibuf_add(id->id_buf, &in6, sizeof(in6)) != 0) { ibuf_release(id->id_buf); return (-1); } break; case IKEV2_ID_ASN1_DN: /* policy has ID in string-format, convert to ASN1 */ if ((name = ca_x509_name_parse(polid->id_data)) == NULL || (len = i2d_X509_NAME(name, NULL)) < 0 || (p = ibuf_reserve(id->id_buf, len)) == NULL || (i2d_X509_NAME(name, &p)) < 0) { if (name) X509_NAME_free(name); ibuf_release(id->id_buf); return (-1); } X509_NAME_free(name); break; default: if (ibuf_add(id->id_buf, polid->id_data, polid->id_length) != 0) { ibuf_release(id->id_buf); return (-1); } break; } if (ikev2_print_id(id, idstr, sizeof(idstr)) == -1) return (-1); log_debug("%s: %s %s length %zu", __func__, srcid ? "srcid" : "dstid", idstr, ibuf_size(id->id_buf)); return (0); } struct ike_header * ikev2_add_header(struct ibuf *buf, struct iked_sa *sa, u_int32_t msgid, u_int8_t nextpayload, u_int8_t exchange, u_int8_t flags) { struct ike_header *hdr; if ((hdr = ibuf_advance(buf, sizeof(*hdr))) == NULL) { log_debug("%s: failed to add header", __func__); return (NULL); } hdr->ike_ispi = htobe64(sa->sa_hdr.sh_ispi); hdr->ike_rspi = htobe64(sa->sa_hdr.sh_rspi); hdr->ike_nextpayload = nextpayload; hdr->ike_version = IKEV2_VERSION; hdr->ike_exchange = exchange; hdr->ike_msgid = htobe32(msgid); hdr->ike_length = htobe32(sizeof(*hdr)); hdr->ike_flags = flags; if (sa->sa_hdr.sh_initiator) hdr->ike_flags |= IKEV2_FLAG_INITIATOR; return (hdr); } int ikev2_set_header(struct ike_header *hdr, size_t length) { u_int32_t hdrlength = sizeof(*hdr) + length; if (hdrlength > UINT32_MAX) { log_debug("%s: message too long", __func__); return (-1); } hdr->ike_length = htobe32(sizeof(*hdr) + length); return (0); } struct ikev2_payload * ikev2_add_payload(struct ibuf *buf) { struct ikev2_payload *pld; if ((pld = ibuf_advance(buf, sizeof(*pld))) == NULL) { log_debug("%s: failed to add payload", __func__); return (NULL); } pld->pld_nextpayload = IKEV2_PAYLOAD_NONE; pld->pld_length = sizeof(*pld); return (pld); } ssize_t ikev2_add_ts_payload(struct ibuf *buf, u_int type, struct iked_sa *sa) { struct iked_policy *pol = sa->sa_policy; struct ikev2_tsp *tsp; struct ikev2_ts *ts; struct iked_flow *flow; struct iked_addr *addr; struct iked_addr pooladdr; u_int8_t *ptr; size_t len = 0; u_int32_t av[4], bv[4], mv[4]; struct sockaddr_in *in4; struct sockaddr_in6 *in6; if ((tsp = ibuf_advance(buf, sizeof(*tsp))) == NULL) return (-1); tsp->tsp_count = pol->pol_nflows; len = sizeof(*tsp); RB_FOREACH(flow, iked_flows, &pol->pol_flows) { if ((ts = ibuf_advance(buf, sizeof(*ts))) == NULL) return (-1); if (type == IKEV2_PAYLOAD_TSi) { if (sa->sa_hdr.sh_initiator) addr = &flow->flow_src; else addr = &flow->flow_dst; } else if (type == IKEV2_PAYLOAD_TSr) { if (sa->sa_hdr.sh_initiator) addr = &flow->flow_dst; else addr = &flow->flow_src; } else return (-1); /* patch remote address (if configured to 0.0.0.0) */ if ((type == IKEV2_PAYLOAD_TSi && !sa->sa_hdr.sh_initiator) || (type == IKEV2_PAYLOAD_TSr && sa->sa_hdr.sh_initiator)) { if (ikev2_cp_fixaddr(sa, addr, &pooladdr) != -1) addr = &pooladdr; } ts->ts_protoid = flow->flow_ipproto; if (addr->addr_port) { ts->ts_startport = addr->addr_port; ts->ts_endport = addr->addr_port; } else { ts->ts_startport = 0; ts->ts_endport = 0xffff; } switch (addr->addr_af) { case AF_INET: ts->ts_type = IKEV2_TS_IPV4_ADDR_RANGE; ts->ts_length = htobe16(sizeof(*ts) + 8); if ((ptr = ibuf_advance(buf, 8)) == NULL) return (-1); in4 = (struct sockaddr_in *)&addr->addr; if (addr->addr_net) { /* Convert IPv4 network to address range */ mv[0] = prefixlen2mask(addr->addr_mask); av[0] = in4->sin_addr.s_addr & mv[0]; bv[0] = in4->sin_addr.s_addr | ~mv[0]; } else av[0] = bv[0] = in4->sin_addr.s_addr; memcpy(ptr, &av[0], 4); memcpy(ptr + 4, &bv[0], 4); break; case AF_INET6: ts->ts_type = IKEV2_TS_IPV6_ADDR_RANGE; ts->ts_length = htobe16(sizeof(*ts) + 32); if ((ptr = ibuf_advance(buf, 32)) == NULL) return (-1); in6 = (struct sockaddr_in6 *)&addr->addr; memcpy(&av, &in6->sin6_addr.s6_addr, 16); memcpy(&bv, &in6->sin6_addr.s6_addr, 16); if (addr->addr_net) { /* Convert IPv6 network to address range */ prefixlen2mask6(addr->addr_mask, mv); av[0] &= mv[0]; av[1] &= mv[1]; av[2] &= mv[2]; av[3] &= mv[3]; bv[0] |= ~mv[0]; bv[1] |= ~mv[1]; bv[2] |= ~mv[2]; bv[3] |= ~mv[3]; } memcpy(ptr, &av, 16); memcpy(ptr + 16, &bv, 16); break; } len += betoh16(ts->ts_length); } return (len); } ssize_t ikev2_add_ts(struct ibuf *e, struct ikev2_payload **pld, ssize_t len, struct iked_sa *sa, int reverse) { if (ikev2_next_payload(*pld, len, IKEV2_PAYLOAD_TSi) == -1) return (-1); /* TSi payload */ if ((*pld = ikev2_add_payload(e)) == NULL) return (-1); if ((len = ikev2_add_ts_payload(e, reverse ? IKEV2_PAYLOAD_TSr : IKEV2_PAYLOAD_TSi, sa)) == -1) return (-1); if (ikev2_next_payload(*pld, len, IKEV2_PAYLOAD_TSr) == -1) return (-1); /* TSr payload */ if ((*pld = ikev2_add_payload(e)) == NULL) return (-1); if ((len = ikev2_add_ts_payload(e, reverse ? IKEV2_PAYLOAD_TSi : IKEV2_PAYLOAD_TSr, sa)) == -1) return (-1); return (len); } ssize_t ikev2_add_certreq(struct ibuf *e, struct ikev2_payload **pld, ssize_t len, struct ibuf *certreq, u_int8_t type) { struct ikev2_cert *cert; if (type == IKEV2_CERT_NONE) return (len); if (ikev2_next_payload(*pld, len, IKEV2_PAYLOAD_CERTREQ) == -1) return (-1); /* CERTREQ payload */ if ((*pld = ikev2_add_payload(e)) == NULL) return (-1); if ((cert = ibuf_advance(e, sizeof(*cert))) == NULL) return (-1); cert->cert_type = type; len = sizeof(*cert); if (certreq != NULL && cert->cert_type == IKEV2_CERT_X509_CERT) { if (ikev2_add_buf(e, certreq) == -1) return (-1); len += ibuf_size(certreq); } log_debug("%s: type %s length %zd", __func__, print_map(type, ikev2_cert_map), len); return (len); } ssize_t ikev2_add_ipcompnotify(struct iked *env, struct ibuf *e, struct ikev2_payload **pld, ssize_t len, struct iked_sa *sa) { struct iked_childsa csa; struct ikev2_notify *n; u_int8_t *ptr; u_int16_t cpi; u_int32_t spi; u_int8_t transform; /* we only support deflate */ transform = IKEV2_IPCOMP_DEFLATE; bzero(&csa, sizeof(csa)); csa.csa_saproto = IKEV2_SAPROTO_IPCOMP; csa.csa_ikesa = sa; csa.csa_local = &sa->sa_peer; csa.csa_peer = &sa->sa_local; if (pfkey_sa_init(env->sc_pfkey, &csa, &spi) == -1) return (-1); /* * We get spi == 0 if the kernel does not support IPcomp, * so just return the length of the current payload. */ if (spi == 0) return (len); cpi = htobe16((u_int16_t)spi); if (*pld) if (ikev2_next_payload(*pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) return (-1); if ((*pld = ikev2_add_payload(e)) == NULL) return (-1); len = sizeof(*n) + sizeof(cpi) + sizeof(transform); if ((ptr = ibuf_advance(e, len)) == NULL) return (-1); n = (struct ikev2_notify *)ptr; n->n_protoid = 0; n->n_spisize = 0; n->n_type = htobe16(IKEV2_N_IPCOMP_SUPPORTED); ptr += sizeof(*n); memcpy(ptr, &cpi, sizeof(cpi)); ptr += sizeof(cpi); memcpy(ptr, &transform, sizeof(transform)); sa->sa_cpi_in = spi; /* already on host byte order */ log_debug("%s: sa_cpi_in 0x%04x", __func__, sa->sa_cpi_in); return (len); } int ikev2_next_payload(struct ikev2_payload *pld, size_t length, u_int8_t nextpayload) { size_t pldlength = sizeof(*pld) + length; if (pldlength > UINT16_MAX) { log_debug("%s: payload too long", __func__); return (-1); } log_debug("%s: length %zu nextpayload %s", __func__, pldlength, print_map(nextpayload, ikev2_payload_map)); pld->pld_length = htobe16(pldlength); pld->pld_nextpayload = nextpayload; return (0); } ssize_t ikev2_nat_detection(struct iked *env, struct iked_message *msg, void *ptr, size_t len, u_int type) { EVP_MD_CTX ctx; struct ike_header *hdr; u_int8_t md[SHA_DIGEST_LENGTH]; u_int mdlen = sizeof(md); struct iked_sa *sa = msg->msg_sa; struct sockaddr_in *in4; struct sockaddr_in6 *in6; ssize_t ret = -1; struct sockaddr *src, *dst, *ss; u_int64_t rspi, ispi; struct ibuf *buf; int frompeer = 0; u_int32_t rnd; if (ptr == NULL) return (mdlen); if (ikev2_msg_frompeer(msg)) { buf = msg->msg_parent->msg_data; if ((hdr = ibuf_seek(buf, 0, sizeof(*hdr))) == NULL) return (-1); ispi = hdr->ike_ispi; rspi = hdr->ike_rspi; frompeer = 1; src = (struct sockaddr *)&msg->msg_peer; dst = (struct sockaddr *)&msg->msg_local; } else { ispi = htobe64(sa->sa_hdr.sh_ispi); rspi = htobe64(sa->sa_hdr.sh_rspi); frompeer = 0; src = (struct sockaddr *)&msg->msg_local; dst = (struct sockaddr *)&msg->msg_peer; } EVP_MD_CTX_init(&ctx); EVP_DigestInit_ex(&ctx, EVP_sha1(), NULL); switch (type) { case IKEV2_N_NAT_DETECTION_SOURCE_IP: log_debug("%s: %s source %s %s %s", __func__, frompeer ? "peer" : "local", print_spi(betoh64(ispi), 8), print_spi(betoh64(rspi), 8), print_host(src, NULL, 0)); ss = src; break; case IKEV2_N_NAT_DETECTION_DESTINATION_IP: log_debug("%s: %s destination %s %s %s", __func__, frompeer ? "peer" : "local", print_spi(betoh64(ispi), 8), print_spi(betoh64(rspi), 8), print_host(dst, NULL, 0)); ss = dst; break; default: goto done; } EVP_DigestUpdate(&ctx, &ispi, sizeof(ispi)); EVP_DigestUpdate(&ctx, &rspi, sizeof(rspi)); switch (ss->sa_family) { case AF_INET: in4 = (struct sockaddr_in *)ss; EVP_DigestUpdate(&ctx, &in4->sin_addr.s_addr, sizeof(in4->sin_addr.s_addr)); EVP_DigestUpdate(&ctx, &in4->sin_port, sizeof(in4->sin_port)); break; case AF_INET6: in6 = (struct sockaddr_in6 *)ss; EVP_DigestUpdate(&ctx, &in6->sin6_addr.s6_addr, sizeof(in6->sin6_addr.s6_addr)); EVP_DigestUpdate(&ctx, &in6->sin6_port, sizeof(in6->sin6_port)); break; default: goto done; } if (env->sc_opts & IKED_OPT_NATT) { /* Enforce NAT-T/UDP-encapsulation by distorting the digest */ rnd = arc4random(); EVP_DigestUpdate(&ctx, &rnd, sizeof(rnd)); } EVP_DigestFinal_ex(&ctx, md, &mdlen); if (len < mdlen) goto done; memcpy(ptr, md, mdlen); ret = mdlen; done: EVP_MD_CTX_cleanup(&ctx); return (ret); } ssize_t ikev2_add_cp(struct iked *env, struct iked_sa *sa, struct ibuf *buf) { struct iked_policy *pol = sa->sa_policy; struct ikev2_cp *cp; struct ikev2_cfg *cfg; struct iked_cfg *ikecfg; u_int i; u_int32_t mask4; size_t len; struct sockaddr_in *in4; struct sockaddr_in6 *in6; u_int8_t prefixlen; if ((cp = ibuf_advance(buf, sizeof(*cp))) == NULL) return (-1); len = sizeof(*cp); switch (sa->sa_cp) { case IKEV2_CP_REQUEST: cp->cp_type = IKEV2_CP_REPLY; break; case IKEV2_CP_REPLY: case IKEV2_CP_SET: case IKEV2_CP_ACK: /* Not yet supported */ return (-1); } for (i = 0; i < pol->pol_ncfg; i++) { ikecfg = &pol->pol_cfg[i]; if (ikecfg->cfg_action != cp->cp_type) continue; if ((cfg = ibuf_advance(buf, sizeof(*cfg))) == NULL) return (-1); cfg->cfg_type = htobe16(ikecfg->cfg_type); len += sizeof(*cfg); switch (ikecfg->cfg_type) { case IKEV2_CFG_INTERNAL_IP4_ADDRESS: case IKEV2_CFG_INTERNAL_IP4_NETMASK: case IKEV2_CFG_INTERNAL_IP4_DNS: case IKEV2_CFG_INTERNAL_IP4_NBNS: case IKEV2_CFG_INTERNAL_IP4_DHCP: case IKEV2_CFG_INTERNAL_IP4_SERVER: /* 4 bytes IPv4 address */ in4 = (ikecfg->cfg.address.addr_mask != 32 && (ikecfg->cfg_type == IKEV2_CFG_INTERNAL_IP4_ADDRESS) && sa->sa_addrpool && sa->sa_addrpool->addr_af == AF_INET) ? (struct sockaddr_in *)&sa->sa_addrpool->addr : (struct sockaddr_in *)&ikecfg->cfg.address.addr; cfg->cfg_length = htobe16(4); if (ibuf_add(buf, &in4->sin_addr.s_addr, 4) == -1) return (-1); len += 4; break; case IKEV2_CFG_INTERNAL_IP4_SUBNET: /* 4 bytes IPv4 address + 4 bytes IPv4 mask + */ in4 = (struct sockaddr_in *)&ikecfg->cfg.address.addr; mask4 = prefixlen2mask(ikecfg->cfg.address.addr_mask); cfg->cfg_length = htobe16(8); if (ibuf_add(buf, &in4->sin_addr.s_addr, 4) == -1) return (-1); if (ibuf_add(buf, &mask4, 4) == -1) return (-1); len += 8; break; case IKEV2_CFG_INTERNAL_IP6_DNS: case IKEV2_CFG_INTERNAL_IP6_NBNS: case IKEV2_CFG_INTERNAL_IP6_DHCP: case IKEV2_CFG_INTERNAL_IP6_SERVER: /* 16 bytes IPv6 address */ in6 = (struct sockaddr_in6 *)&ikecfg->cfg.address; cfg->cfg_length = htobe16(16); if (ibuf_add(buf, &in6->sin6_addr.s6_addr, 16) == -1) return (-1); len += 16; break; case IKEV2_CFG_INTERNAL_IP6_ADDRESS: case IKEV2_CFG_INTERNAL_IP6_SUBNET: /* 16 bytes IPv6 address + 1 byte prefix length */ in6 = (ikecfg->cfg.address.addr_mask != 128 && (ikecfg->cfg_type == IKEV2_CFG_INTERNAL_IP6_ADDRESS) && sa->sa_addrpool && sa->sa_addrpool->addr_af == AF_INET6) ? (struct sockaddr_in6 *)&sa->sa_addrpool->addr : (struct sockaddr_in6 *)&ikecfg->cfg.address.addr; cfg->cfg_length = htobe16(17); if (ibuf_add(buf, &in6->sin6_addr.s6_addr, 16) == -1) return (-1); if (ikecfg->cfg.address.addr_net) prefixlen = ikecfg->cfg.address.addr_mask; else prefixlen = 128; if (ibuf_add(buf, &prefixlen, 1) == -1) return (-1); len += 16 + 1; break; case IKEV2_CFG_APPLICATION_VERSION: /* Reply with an empty string (non-NUL terminated) */ cfg->cfg_length = 0; break; } } return (len); } ssize_t ikev2_add_proposals(struct iked *env, struct iked_sa *sa, struct ibuf *buf, struct iked_proposals *proposals, u_int8_t protoid, int initiator, int sendikespi) { struct ikev2_sa_proposal *sap; struct iked_transform *xform; struct iked_proposal *prop; struct iked_childsa csa; ssize_t length = 0, saplength, xflen; u_int64_t spi64; u_int32_t spi32, spi; u_int i; TAILQ_FOREACH(prop, proposals, prop_entry) { if ((protoid && prop->prop_protoid != protoid) || (!protoid && prop->prop_protoid == IKEV2_SAPROTO_IKE)) continue; if (protoid != IKEV2_SAPROTO_IKE && initiator) { bzero(&csa, sizeof(csa)); csa.csa_ikesa = sa; csa.csa_saproto = prop->prop_protoid; csa.csa_local = &sa->sa_peer; csa.csa_peer = &sa->sa_local; if (pfkey_sa_init(env->sc_pfkey, &csa, &spi) == -1) return (-1); prop->prop_localspi.spi = spi; prop->prop_localspi.spi_size = 4; prop->prop_localspi.spi_protoid = prop->prop_protoid; } if ((sap = ibuf_advance(buf, sizeof(*sap))) == NULL) { log_debug("%s: failed to add proposal", __func__); return (-1); } if (sendikespi) { /* Special case for IKE SA rekeying */ prop->prop_localspi.spi = initiator ? sa->sa_hdr.sh_ispi : sa->sa_hdr.sh_rspi; prop->prop_localspi.spi_size = 8; prop->prop_localspi.spi_protoid = IKEV2_SAPROTO_IKE; } sap->sap_proposalnr = prop->prop_id; sap->sap_protoid = prop->prop_protoid; sap->sap_spisize = prop->prop_localspi.spi_size; sap->sap_transforms = prop->prop_nxforms; saplength = sizeof(*sap); switch (prop->prop_localspi.spi_size) { case 4: spi32 = htobe32(prop->prop_localspi.spi); if (ibuf_add(buf, &spi32, sizeof(spi32)) != 0) return (-1); saplength += 4; break; case 8: spi64 = htobe64(prop->prop_localspi.spi); if (ibuf_add(buf, &spi64, sizeof(spi64)) != 0) return (-1); saplength += 8; break; default: break; } for (i = 0; i < prop->prop_nxforms; i++) { xform = prop->prop_xforms + i; if ((xflen = ikev2_add_transform(buf, i == prop->prop_nxforms - 1 ? IKEV2_XFORM_LAST : IKEV2_XFORM_MORE, xform->xform_type, xform->xform_id, xform->xform_length)) == -1) return (-1); saplength += xflen; } sap->sap_length = htobe16(saplength); length += saplength; } log_debug("%s: length %zd", __func__, length); return (length); } ssize_t ikev2_add_transform(struct ibuf *buf, u_int8_t more, u_int8_t type, u_int16_t id, u_int16_t length) { struct ikev2_transform *xfrm; struct ikev2_attribute *attr; if ((xfrm = ibuf_advance(buf, sizeof(*xfrm))) == NULL) { log_debug("%s: failed to add transform", __func__); return (-1); } xfrm->xfrm_more = more; xfrm->xfrm_type = type; xfrm->xfrm_id = htobe16(id); if (length) { xfrm->xfrm_length = htobe16(sizeof(*xfrm) + sizeof(*attr)); if ((attr = ibuf_advance(buf, sizeof(*attr))) == NULL) { log_debug("%s: failed to add attribute", __func__); return (-1); } attr->attr_type = htobe16(IKEV2_ATTRAF_TV | IKEV2_ATTRTYPE_KEY_LENGTH); attr->attr_length = htobe16(length); } else xfrm->xfrm_length = htobe16(sizeof(*xfrm)); return (betoh16(xfrm->xfrm_length)); } int ikev2_add_data(struct ibuf *buf, void *data, size_t length) { void *msgbuf; if ((msgbuf = ibuf_advance(buf, length)) == NULL) { log_debug("%s: failed", __func__); return (-1); } memcpy(msgbuf, data, length); return (0); } int ikev2_add_buf(struct ibuf *buf, struct ibuf *data) { void *msgbuf; if ((msgbuf = ibuf_advance(buf, ibuf_size(data))) == NULL) { log_debug("%s: failed", __func__); return (-1); } memcpy(msgbuf, ibuf_data(data), ibuf_size(data)); return (0); } void ikev2_resp_recv(struct iked *env, struct iked_message *msg, struct ike_header *hdr) { struct iked_sa *sa; switch (hdr->ike_exchange) { case IKEV2_EXCHANGE_IKE_SA_INIT: if (msg->msg_sa != NULL) { log_debug("%s: SA already exists", __func__); return; } if ((msg->msg_sa = sa_new(env, betoh64(hdr->ike_ispi), betoh64(hdr->ike_rspi), 0, msg->msg_policy)) == NULL) { log_debug("%s: failed to get new SA", __func__); return; } break; case IKEV2_EXCHANGE_IKE_AUTH: if (ikev2_msg_valid_ike_sa(env, hdr, msg) == -1) return; if (sa_stateok(msg->msg_sa, IKEV2_STATE_VALID)) { log_debug("%s: already authenticated", __func__); return; } break; case IKEV2_EXCHANGE_CREATE_CHILD_SA: if (ikev2_msg_valid_ike_sa(env, hdr, msg) == -1) return; break; case IKEV2_EXCHANGE_INFORMATIONAL: if (ikev2_msg_valid_ike_sa(env, hdr, msg) == -1) return; break; default: log_debug("%s: unsupported exchange: %s", __func__, print_map(hdr->ike_exchange, ikev2_exchange_map)); return; } if (ikev2_pld_parse(env, hdr, msg, msg->msg_offset) != 0) { log_debug("%s: failed to parse message", __func__); return; } if (!ikev2_msg_frompeer(msg)) return; if ((sa = msg->msg_sa) == NULL) return; if (msg->msg_natt && sa->sa_natt == 0) { log_debug("%s: NAT-T message received, updated SA", __func__); sa->sa_natt = 1; } switch (hdr->ike_exchange) { case IKEV2_EXCHANGE_IKE_SA_INIT: if (ikev2_sa_responder(env, sa, NULL, msg) != 0) { log_debug("%s: failed to get IKE SA keys", __func__); sa_state(env, sa, IKEV2_STATE_CLOSED); return; } if (ikev2_resp_ike_sa_init(env, msg) != 0) { log_debug("%s: failed to send init response", __func__); sa_state(env, sa, IKEV2_STATE_CLOSED); return; } break; case IKEV2_EXCHANGE_IKE_AUTH: if (!sa_stateok(sa, IKEV2_STATE_SA_INIT)) { log_debug("%s: state mismatch", __func__); sa_state(env, sa, IKEV2_STATE_CLOSED); return; } if (!sa_stateok(sa, IKEV2_STATE_AUTH_REQUEST) && sa->sa_policy->pol_auth.auth_eap) sa_state(env, sa, IKEV2_STATE_EAP); if (ikev2_ike_auth_recv(env, sa, msg) != 0) { log_debug("%s: failed to send auth response", __func__); sa_state(env, sa, IKEV2_STATE_CLOSED); return; } break; case IKEV2_EXCHANGE_CREATE_CHILD_SA: (void)ikev2_resp_create_child_sa(env, msg); break; case IKEV2_EXCHANGE_INFORMATIONAL: if (!msg->msg_responded && !msg->msg_error) { (void)ikev2_send_ike_e(env, sa, NULL, IKEV2_PAYLOAD_NONE, IKEV2_EXCHANGE_INFORMATIONAL, 1); msg->msg_responded = 1; } break; default: break; } } int ikev2_resp_ike_sa_init(struct iked *env, struct iked_message *msg) { struct iked_message resp; struct ike_header *hdr; struct ikev2_payload *pld; struct ikev2_keyexchange *ke; struct ikev2_notify *n; struct iked_sa *sa = msg->msg_sa; struct ibuf *buf; struct group *group; u_int8_t *ptr; ssize_t len; int ret = -1; if (sa->sa_hdr.sh_initiator) { log_debug("%s: called by initiator", __func__); return (-1); } if ((buf = ikev2_msg_init(env, &resp, &msg->msg_peer, msg->msg_peerlen, &msg->msg_local, msg->msg_locallen, 1)) == NULL) goto done; resp.msg_sa = sa; resp.msg_fd = msg->msg_fd; resp.msg_natt = msg->msg_natt; resp.msg_msgid = 0; /* IKE header */ if ((hdr = ikev2_add_header(buf, sa, resp.msg_msgid, IKEV2_PAYLOAD_SA, IKEV2_EXCHANGE_IKE_SA_INIT, IKEV2_FLAG_RESPONSE)) == NULL) goto done; /* SA payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((len = ikev2_add_proposals(env, sa, buf, &sa->sa_proposals, IKEV2_SAPROTO_IKE, sa->sa_hdr.sh_initiator, 0)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_KE) == -1) goto done; /* KE payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((ke = ibuf_advance(buf, sizeof(*ke))) == NULL) goto done; if ((group = sa->sa_dhgroup) == NULL) { log_debug("%s: invalid dh", __func__); goto done; } ke->kex_dhgroup = htobe16(group->id); if (ikev2_add_buf(buf, sa->sa_dhrexchange) == -1) goto done; len = sizeof(*ke) + dh_getlen(group); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONCE) == -1) goto done; /* NONCE payload */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if (ikev2_add_buf(buf, sa->sa_rnonce) == -1) goto done; len = ibuf_size(sa->sa_rnonce); if ((env->sc_opts & IKED_OPT_NONATT) == 0 && msg->msg_local.ss_family != AF_UNSPEC) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) goto done; /* NAT-T notify payloads */ if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((n = ibuf_advance(buf, sizeof(*n))) == NULL) goto done; n->n_type = htobe16(IKEV2_N_NAT_DETECTION_SOURCE_IP); len = ikev2_nat_detection(env, &resp, NULL, 0, 0); if ((ptr = ibuf_advance(buf, len)) == NULL) goto done; if ((len = ikev2_nat_detection(env, &resp, ptr, len, betoh16(n->n_type))) == -1) goto done; len += sizeof(*n); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) goto done; if ((pld = ikev2_add_payload(buf)) == NULL) goto done; if ((n = ibuf_advance(buf, sizeof(*n))) == NULL) goto done; n->n_type = htobe16(IKEV2_N_NAT_DETECTION_DESTINATION_IP); len = ikev2_nat_detection(env, &resp, NULL, 0, 0); if ((ptr = ibuf_advance(buf, len)) == NULL) goto done; if ((len = ikev2_nat_detection(env, &resp, ptr, len, betoh16(n->n_type))) == -1) goto done; len += sizeof(*n); } if (sa->sa_statevalid & IKED_REQ_CERT) { /* CERTREQ payload(s) */ if ((len = ikev2_add_certreq(buf, &pld, len, env->sc_certreq, env->sc_certreqtype)) == -1) goto done; if (env->sc_certreqtype != sa->sa_policy->pol_certreqtype && (len = ikev2_add_certreq(buf, &pld, len, NULL, sa->sa_policy->pol_certreqtype)) == -1) goto done; } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; if (ikev2_set_header(hdr, ibuf_size(buf) - sizeof(*hdr)) == -1) goto done; (void)ikev2_pld_parse(env, hdr, &resp, 0); ibuf_release(sa->sa_2ndmsg); if ((sa->sa_2ndmsg = ibuf_dup(buf)) == NULL) { log_debug("%s: failed to copy 2nd message", __func__); goto done; } resp.msg_sa = NULL; /* Don't save the response */ ret = ikev2_msg_send(env, &resp); done: ikev2_msg_cleanup(env, &resp); return (ret); } int ikev2_resp_ike_auth(struct iked *env, struct iked_sa *sa) { struct ikev2_payload *pld; struct ikev2_notify *n; struct ikev2_cert *cert; struct ikev2_auth *auth; struct iked_id *id, *certid; struct ibuf *e = NULL; u_int8_t firstpayload; int ret = -1; ssize_t len; if (sa == NULL) return (-1); if (sa->sa_state == IKEV2_STATE_EAP) return (ikev2_resp_ike_eap(env, sa, NULL)); else if (!sa_stateok(sa, IKEV2_STATE_VALID)) return (0); /* ignore */ if (ikev2_cp_setaddr(env, sa) < 0) return (-1); if (ikev2_childsa_negotiate(env, sa, &sa->sa_kex, &sa->sa_proposals, sa->sa_hdr.sh_initiator, 0) < 0) return (-1); /* New encrypted message buffer */ if ((e = ibuf_static()) == NULL) goto done; if (!sa->sa_localauth.id_type) { /* Downgrade the state */ sa_state(env, sa, IKEV2_STATE_AUTH_SUCCESS); } if (!sa_stateok(sa, IKEV2_STATE_VALID)) { /* Notify payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; firstpayload = IKEV2_PAYLOAD_NOTIFY; if ((n = ibuf_advance(e, sizeof(*n))) == NULL) goto done; n->n_protoid = IKEV2_SAPROTO_IKE; /* XXX ESP etc. */ n->n_spisize = 0; n->n_type = htobe16(IKEV2_N_AUTHENTICATION_FAILED); len = sizeof(*n); goto send; } if (sa->sa_hdr.sh_initiator) { id = &sa->sa_iid; certid = &sa->sa_icert; } else { id = &sa->sa_rid; certid = &sa->sa_rcert; } if (sa->sa_state != IKEV2_STATE_EAP_VALID) { /* ID payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; firstpayload = IKEV2_PAYLOAD_IDr; if (ibuf_cat(e, id->id_buf) != 0) goto done; len = ibuf_size(id->id_buf); /* CERT payload */ if ((sa->sa_statevalid & IKED_REQ_CERT) && (certid->id_type != IKEV2_CERT_NONE)) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_CERT) == -1) goto done; if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((cert = ibuf_advance(e, sizeof(*cert))) == NULL) goto done; cert->cert_type = certid->id_type; if (ibuf_cat(e, certid->id_buf) != 0) goto done; len = ibuf_size(certid->id_buf) + sizeof(*cert); } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_AUTH) == -1) goto done; } else firstpayload = IKEV2_PAYLOAD_AUTH; /* AUTH payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((auth = ibuf_advance(e, sizeof(*auth))) == NULL) goto done; auth->auth_method = sa->sa_localauth.id_type; if (ibuf_cat(e, sa->sa_localauth.id_buf) != 0) goto done; len = ibuf_size(sa->sa_localauth.id_buf) + sizeof(*auth); /* CP payload */ if (sa->sa_cp) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_CP) == -1) goto done; if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = ikev2_add_cp(env, sa, e)) == -1) goto done; } /* compression */ if (sa->sa_ipcomp && (len = ikev2_add_ipcompnotify(env, e, &pld, len, sa)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_SA) == -1) goto done; /* SA payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = ikev2_add_proposals(env, sa, e, &sa->sa_proposals, 0, sa->sa_hdr.sh_initiator, 0)) == -1) goto done; if ((len = ikev2_add_ts(e, &pld, len, sa, 0)) == -1) goto done; send: if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_IKE_AUTH, firstpayload, 1); if (ret == 0) ret = ikev2_childsa_enable(env, sa); if (ret == 0) { sa_state(env, sa, IKEV2_STATE_ESTABLISHED); timer_set(env, &sa->sa_timer, ikev2_ike_sa_alive, sa); timer_add(env, &sa->sa_timer, IKED_IKE_SA_ALIVE_TIMEOUT); timer_set(env, &sa->sa_rekey, ikev2_ike_sa_rekey, sa); if (sa->sa_policy->pol_rekey) timer_add(env, &sa->sa_rekey, sa->sa_policy->pol_rekey); } done: if (ret) ikev2_childsa_delete(env, sa, 0, 0, NULL, 1); ibuf_release(e); return (ret); } int ikev2_resp_ike_eap(struct iked *env, struct iked_sa *sa, struct ibuf *eapmsg) { struct ikev2_payload *pld; struct ikev2_cert *cert; struct ikev2_auth *auth; struct iked_id *id, *certid; struct ibuf *e = NULL; u_int8_t firstpayload; int ret = -1; ssize_t len = 0; if (!sa_stateok(sa, IKEV2_STATE_EAP)) return (0); /* Responder only */ if (sa->sa_hdr.sh_initiator) return (-1); /* New encrypted message buffer */ if ((e = ibuf_static()) == NULL) goto done; id = &sa->sa_rid; certid = &sa->sa_rcert; /* ID payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; firstpayload = IKEV2_PAYLOAD_IDr; if (ibuf_cat(e, id->id_buf) != 0) goto done; len = ibuf_size(id->id_buf); if ((sa->sa_statevalid & IKED_REQ_CERT) && (certid->id_type != IKEV2_CERT_NONE)) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_CERT) == -1) goto done; /* CERT payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((cert = ibuf_advance(e, sizeof(*cert))) == NULL) goto done; cert->cert_type = certid->id_type; if (ibuf_cat(e, certid->id_buf) != 0) goto done; len = ibuf_size(certid->id_buf) + sizeof(*cert); } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_AUTH) == -1) goto done; /* AUTH payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((auth = ibuf_advance(e, sizeof(*auth))) == NULL) goto done; auth->auth_method = sa->sa_localauth.id_type; if (ibuf_cat(e, sa->sa_localauth.id_buf) != 0) goto done; len = ibuf_size(sa->sa_localauth.id_buf) + sizeof(*auth); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_EAP) == -1) goto done; /* EAP payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = eap_identity_request(e)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_IKE_AUTH, firstpayload, 1); done: ibuf_release(e); return (ret); } int ikev2_send_ike_e(struct iked *env, struct iked_sa *sa, struct ibuf *buf, u_int8_t firstpayload, u_int8_t exchange, int response) { struct ikev2_payload *pld; struct ibuf *e = NULL; int ret = -1; /* New encrypted message buffer */ if ((e = ibuf_static()) == NULL) goto done; if ((pld = ikev2_add_payload(e)) == NULL) goto done; if (buf) { if (ibuf_cat(e, buf) != 0) goto done; if (ikev2_next_payload(pld, ibuf_size(buf), IKEV2_PAYLOAD_NONE) == -1) goto done; } ret = ikev2_msg_send_encrypt(env, sa, &e, exchange, firstpayload, response); done: ibuf_release(e); return (ret); } int ikev2_set_sa_proposal(struct iked_sa *sa, struct iked_policy *pol, u_int proto) { struct iked_proposal *prop, *copy; struct iked_transform *xform; u_int i; /* create copy of the policy proposals */ config_free_proposals(&sa->sa_proposals, proto); TAILQ_FOREACH(prop, &pol->pol_proposals, prop_entry) { if (proto != 0 && prop->prop_protoid != proto) continue; if ((copy = config_add_proposal(&sa->sa_proposals, prop->prop_id, prop->prop_protoid)) == NULL) return (-1); for (i = 0; i < prop->prop_nxforms; i++) { xform = &prop->prop_xforms[i]; if (config_add_transform(copy, xform->xform_type, xform->xform_id, xform->xform_length, xform->xform_keylength) == NULL) return (-1); } } return (0); } int ikev2_send_create_child_sa(struct iked *env, struct iked_sa *sa, struct iked_spi *rekey, u_int8_t protoid) { struct iked_policy *pol = sa->sa_policy; struct iked_childsa *csa = NULL, *csb = NULL; struct ikev2_notify *n; struct ikev2_payload *pld = NULL; struct ikev2_keyexchange *ke; struct group *group; struct ibuf *e = NULL, *nonce = NULL; u_int8_t *ptr; u_int8_t firstpayload; u_int32_t spi; ssize_t len = 0; int initiator, ret = -1; if (rekey) log_debug("%s: rekeying %s spi %s", __func__, print_map(rekey->spi_protoid, ikev2_saproto_map), print_spi(rekey->spi, rekey->spi_size)); else log_debug("%s: creating new CHILD SAs", __func__); /* XXX cannot initiate multiple concurrent CREATE_CHILD_SA exchanges */ if (sa->sa_stateflags & IKED_REQ_CHILDSA) { log_debug("%s: another CREATE_CHILD_SA exchange already active", __func__); return (-1); } sa->sa_rekeyspi = 0; /* clear rekey spi */ initiator = sa->sa_hdr.sh_initiator ? 1 : 0; if (rekey && ((csa = childsa_lookup(sa, rekey->spi, rekey->spi_protoid)) == NULL || (csb = csa->csa_peersa) == NULL)) { log_debug("%s: CHILD SA %s wasn't found", __func__, print_spi(rekey->spi, rekey->spi_size)); goto done; } /* Generate new nonce */ if ((nonce = ibuf_random(IKED_NONCE_SIZE)) == NULL) goto done; /* Update initiator nonce */ ibuf_release(sa->sa_inonce); sa->sa_inonce = nonce; if ((e = ibuf_static()) == NULL) goto done; /* compression */ if ((pol->pol_flags & IKED_POLICY_IPCOMP) && (len = ikev2_add_ipcompnotify(env, e, &pld, 0, sa)) == -1) goto done; if (pld) { firstpayload = IKEV2_PAYLOAD_NOTIFY; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_SA) == -1) goto done; } else firstpayload = IKEV2_PAYLOAD_SA; /* SA payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; /* * We need to reset the sa_proposal. Otherwise it would be * left over from the IKE_AUTH exchange and would not contain * any DH groups (e.g. for ESP child SAs). */ if (ikev2_set_sa_proposal(sa, pol, protoid) < 0) { log_debug("%s: ikev2_set_sa_proposal failed", __func__); goto done; } if ((len = ikev2_add_proposals(env, sa, e, &sa->sa_proposals, protoid, 1, 0)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONCE) == -1) goto done; /* NONCE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if (ikev2_add_buf(e, nonce) == -1) goto done; len = ibuf_size(nonce); if (config_findtransform(&pol->pol_proposals, IKEV2_XFORMTYPE_DH, protoid)) { log_debug("%s: enable PFS", __func__); ikev2_sa_cleanup_dh(sa); if (ikev2_sa_initiator_dh(sa, NULL, protoid) < 0) { log_debug("%s: failed to setup DH", __func__); goto done; } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_KE) == -1) goto done; /* KE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((ke = ibuf_advance(e, sizeof(*ke))) == NULL) goto done; if ((group = sa->sa_dhgroup) == NULL) { log_debug("%s: invalid dh", __func__); goto done; } ke->kex_dhgroup = htobe16(group->id); if (ikev2_add_buf(e, sa->sa_dhiexchange) == -1) goto done; len = sizeof(*ke) + dh_getlen(group); } if ((len = ikev2_add_ts(e, &pld, len, sa, !initiator)) == -1) goto done; if (rekey) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NOTIFY) == -1) goto done; /* REKEY_SA notification */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((n = ibuf_advance(e, sizeof(*n))) == NULL) goto done; n->n_type = htobe16(IKEV2_N_REKEY_SA); n->n_protoid = rekey->spi_protoid; n->n_spisize = rekey->spi_size; if ((ptr = ibuf_advance(e, rekey->spi_size)) == NULL) goto done; len = rekey->spi_size; spi = htobe32((u_int32_t)csa->csa_peerspi); memcpy(ptr, &spi, rekey->spi_size); len += sizeof(*n); } if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_CREATE_CHILD_SA, firstpayload, 0); if (ret == 0) { if (rekey) { csa->csa_rekey = 1; csb->csa_rekey = 1; /* * Remember the peer spi of the rekeyed * SA for ikev2_init_create_child_sa(). */ sa->sa_rekeyspi = csa->csa_peerspi; } sa->sa_stateflags |= IKED_REQ_CHILDSA; } done: ibuf_release(e); return (ret); } void ikev2_ike_sa_rekey(struct iked *env, void *arg) { struct iked_sa *sa = arg; struct iked_sa *nsa = NULL; struct ikev2_payload *pld = NULL; struct ikev2_keyexchange *ke; struct group *group; struct ibuf *e = NULL, *nonce = NULL; ssize_t len = 0; int ret = -1; log_debug("%s: called for IKE SA %p", __func__, sa); if (sa->sa_stateflags & IKED_REQ_CHILDSA) { /* * We cannot initiate multiple concurrent CREATE_CHILD_SA * exchanges, so retry in one minute. */ timer_add(env, &sa->sa_rekey, 60); return; } if ((nsa = sa_new(env, 0, 0, 1, sa->sa_policy)) == NULL) { log_debug("%s: failed to get new SA", __func__); goto done; } if (ikev2_sa_initiator(env, nsa, sa, NULL)) { log_debug("%s: failed to setup DH", __func__); goto done; } sa_state(env, nsa, IKEV2_STATE_AUTH_SUCCESS); nonce = nsa->sa_inonce; if ((e = ibuf_static()) == NULL) goto done; /* SA payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; /* just reuse the old IKE SA proposals */ if ((len = ikev2_add_proposals(env, nsa, e, &sa->sa_proposals, IKEV2_SAPROTO_IKE, 1, 1)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONCE) == -1) goto done; /* NONCE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if (ikev2_add_buf(e, nonce) == -1) goto done; len = ibuf_size(nonce); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_KE) == -1) goto done; /* KE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((ke = ibuf_advance(e, sizeof(*ke))) == NULL) goto done; if ((group = nsa->sa_dhgroup) == NULL) { log_debug("%s: invalid dh", __func__); goto done; } ke->kex_dhgroup = htobe16(group->id); if (ikev2_add_buf(e, nsa->sa_dhiexchange) == -1) goto done; len = sizeof(*ke) + dh_getlen(group); if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_CREATE_CHILD_SA, IKEV2_PAYLOAD_SA, 0); if (ret == 0) { sa->sa_stateflags |= IKED_REQ_CHILDSA; sa->sa_next = nsa; nsa = NULL; } done: if (nsa) sa_free(env, nsa); ibuf_release(e); if (ret == 0) log_debug("%s: create child SA sent", __func__); else log_debug("%s: could not send create child SA", __func__); /* XXX should we try again in case of ret != 0 ? */ } int ikev2_init_create_child_sa(struct iked *env, struct iked_message *msg) { struct iked_childsa *csa = NULL; struct iked_proposal *prop; struct iked_sa *sa = msg->msg_sa; struct iked_sa *nsa; struct iked_spi *spi; struct ikev2_delete *del; struct ibuf *buf = NULL; u_int32_t spi32; int pfs = 0, ret = -1; if (!ikev2_msg_frompeer(msg) || (sa->sa_stateflags & IKED_REQ_CHILDSA) == 0) return (0); if (msg->msg_prop == NULL || TAILQ_EMPTY(&msg->msg_proposals)) { log_debug("%s: no proposal specified", __func__); return (-1); } if (ikev2_sa_negotiate(&sa->sa_proposals, &sa->sa_proposals, &msg->msg_proposals) != 0) { log_debug("%s: no proposal chosen", __func__); return (-1); } TAILQ_FOREACH(prop, &sa->sa_proposals, prop_entry) { if (prop->prop_protoid == msg->msg_prop->prop_protoid) break; } if (prop == NULL) { log_debug("%s: failed to find %s proposals", __func__, print_map(msg->msg_prop->prop_protoid, ikev2_saproto_map)); return (-1); } /* IKE SA rekeying */ if (prop->prop_protoid == IKEV2_SAPROTO_IKE) { if (sa->sa_next == NULL) { log_debug("%s: missing IKE SA for rekeying", __func__); return (-1); } /* Update the responder SPI */ spi = &msg->msg_prop->prop_peerspi; if ((nsa = sa_new(env, sa->sa_next->sa_hdr.sh_ispi, spi->spi, 1, NULL)) == NULL || nsa != sa->sa_next) { log_debug("%s: invalid rekey SA", __func__); if (nsa) sa_free(env, nsa); sa_free(env, sa->sa_next); sa->sa_next = NULL; return (-1); } if (ikev2_sa_initiator(env, nsa, sa, msg) == -1) { log_debug("%s: failed to get IKE keys", __func__); return (-1); } sa->sa_stateflags &= ~IKED_REQ_CHILDSA; sa->sa_next = NULL; return (ikev2_ikesa_enable(env, sa, nsa)); } /* Child SA rekeying */ if (sa->sa_rekeyspi && (csa = childsa_lookup(sa, sa->sa_rekeyspi, prop->prop_protoid)) != NULL) { log_debug("%s: rekeying CHILD SA old %s spi %s", __func__, print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size), print_spi(prop->prop_peerspi.spi, prop->prop_peerspi.spi_size)); } /* check KE payload for PFS */ if (ibuf_length(msg->msg_ke)) { log_debug("%s: using PFS", __func__); if (ikev2_sa_initiator_dh(sa, msg, prop->prop_protoid) < 0) { log_debug("%s: failed to setup DH", __func__); return (ret); } if (sa->sa_dhpeer == NULL) { log_debug("%s: no peer DH", __func__); return (ret); } pfs = 1; /* XXX check group against policy ? */ /* XXX should ikev2_sa_negotiate do this? */ } /* Update responder's nonce */ if (!ibuf_length(msg->msg_nonce)) { log_debug("%s: responder didn't send nonce", __func__); return (-1); } ibuf_release(sa->sa_rnonce); sa->sa_rnonce = ibuf_dup(msg->msg_nonce); if (ikev2_childsa_negotiate(env, sa, &sa->sa_kex, &sa->sa_proposals, 1, pfs)) { log_debug("%s: failed to get CHILD SAs", __func__); return (-1); } if (csa) { /* Child SA rekeying */ if ((buf = ibuf_static()) == NULL) goto done; if ((del = ibuf_advance(buf, sizeof(*del))) == NULL) goto done; del->del_protoid = prop->prop_protoid; del->del_spisize = sizeof(spi32); del->del_nspi = htobe16(1); spi32 = htobe32(csa->csa_spi.spi); if (ibuf_add(buf, &spi32, sizeof(spi32))) goto done; if (ikev2_send_ike_e(env, sa, buf, IKEV2_PAYLOAD_DELETE, IKEV2_EXCHANGE_INFORMATIONAL, 0)) goto done; sa->sa_stateflags |= IKED_REQ_INF; } ret = ikev2_childsa_enable(env, sa); done: sa->sa_stateflags &= ~IKED_REQ_CHILDSA; if (ret) ikev2_childsa_delete(env, sa, 0, 0, NULL, 1); ibuf_release(buf); return (ret); } int ikev2_ikesa_enable(struct iked *env, struct iked_sa *sa, struct iked_sa *nsa) { struct iked_childsa *csa, *nextcsa; struct iked_flow *flow, *nextflow; struct iked_proposal *prop, *nextprop; int initiator; log_debug("%s: IKE SA %p ispi %s rspi %s replaced" " by SA %p ispi %s rspi %s ", __func__, sa, print_spi(sa->sa_hdr.sh_ispi, 8), print_spi(sa->sa_hdr.sh_rspi, 8), nsa, print_spi(nsa->sa_hdr.sh_ispi, 8), print_spi(nsa->sa_hdr.sh_rspi, 8)); /* * Transfer policy and address: * - Remember if we initiated the original IKE-SA because of our policy. * - Note that sa_address() will insert the new SA when we set sa_peer. */ initiator = !memcmp(&sa->sa_polpeer, &sa->sa_policy->pol_peer, sizeof(sa->sa_polpeer)); nsa->sa_policy = sa->sa_policy; RB_REMOVE(iked_sapeers, &sa->sa_policy->pol_sapeers, sa); sa->sa_policy = NULL; if (sa_address(nsa, &nsa->sa_peer, &sa->sa_peer.addr, initiator) == -1 || sa_address(nsa, &nsa->sa_local, &sa->sa_local.addr, initiator) == -1) { /* reinsert old SA :/ */ sa->sa_policy = nsa->sa_policy; if (RB_FIND(iked_sapeers, &nsa->sa_policy->pol_sapeers, nsa)) RB_REMOVE(iked_sapeers, &nsa->sa_policy->pol_sapeers, nsa); RB_INSERT(iked_sapeers, &sa->sa_policy->pol_sapeers, sa); nsa->sa_policy = NULL; return (-1); } /* Transfer socket and NAT information */ nsa->sa_fd = sa->sa_fd; nsa->sa_natt = sa->sa_natt; nsa->sa_udpencap = sa->sa_udpencap; /* Transfer all Child SAs and flows from the old IKE SA */ for (flow = TAILQ_FIRST(&sa->sa_flows); flow != NULL; flow = nextflow) { nextflow = TAILQ_NEXT(flow, flow_entry); TAILQ_REMOVE(&sa->sa_flows, flow, flow_entry); TAILQ_INSERT_TAIL(&nsa->sa_flows, flow, flow_entry); flow->flow_ikesa = nsa; flow->flow_local = &nsa->sa_local; flow->flow_peer = &nsa->sa_peer; } for (csa = TAILQ_FIRST(&sa->sa_childsas); csa != NULL; csa = nextcsa) { nextcsa = TAILQ_NEXT(csa, csa_entry); TAILQ_REMOVE(&sa->sa_childsas, csa, csa_entry); TAILQ_INSERT_TAIL(&nsa->sa_childsas, csa, csa_entry); csa->csa_ikesa = nsa; if (csa->csa_dir == IPSP_DIRECTION_IN) { csa->csa_local = &nsa->sa_peer; csa->csa_peer = &nsa->sa_local; } else { csa->csa_local = &nsa->sa_local; csa->csa_peer = &nsa->sa_peer; } } /* Transfer all non-IKE proposals */ for (prop = TAILQ_FIRST(&sa->sa_proposals); prop != NULL; prop = nextprop) { nextprop = TAILQ_NEXT(prop, prop_entry); if (prop->prop_protoid == IKEV2_SAPROTO_IKE) continue; TAILQ_REMOVE(&sa->sa_proposals, prop, prop_entry); TAILQ_INSERT_TAIL(&nsa->sa_proposals, prop, prop_entry); } /* Preserve ID information */ if (sa->sa_hdr.sh_initiator == nsa->sa_hdr.sh_initiator) { nsa->sa_iid = sa->sa_iid; nsa->sa_rid = sa->sa_rid; } else { /* initiator and responder role swapped */ nsa->sa_iid = sa->sa_rid; nsa->sa_rid = sa->sa_iid; } /* duplicate the actual buffer */ nsa->sa_iid.id_buf = ibuf_dup(nsa->sa_iid.id_buf); nsa->sa_rid.id_buf = ibuf_dup(nsa->sa_rid.id_buf); /* Transfer sa_addrpool address */ if (sa->sa_addrpool) { RB_REMOVE(iked_addrpool, &env->sc_addrpool, sa); nsa->sa_addrpool = sa->sa_addrpool; sa->sa_addrpool = NULL; RB_INSERT(iked_addrpool, &env->sc_addrpool, nsa); } log_debug("%s: activating new IKE SA", __func__); sa_state(env, nsa, IKEV2_STATE_ESTABLISHED); timer_set(env, &nsa->sa_timer, ikev2_ike_sa_alive, nsa); timer_add(env, &nsa->sa_timer, IKED_IKE_SA_ALIVE_TIMEOUT); timer_set(env, &nsa->sa_rekey, ikev2_ike_sa_rekey, nsa); if (nsa->sa_policy->pol_rekey) timer_add(env, &nsa->sa_rekey, nsa->sa_policy->pol_rekey); nsa->sa_stateflags = nsa->sa_statevalid; /* XXX */ /* unregister DPD keep alive timer & rekey first */ if (sa->sa_state == IKEV2_STATE_ESTABLISHED) { timer_del(env, &sa->sa_rekey); timer_del(env, &sa->sa_timer); } ikev2_ikesa_delete(env, sa, nsa->sa_hdr.sh_initiator); return (0); } void ikev2_ikesa_delete(struct iked *env, struct iked_sa *sa, int initiator) { struct ibuf *buf = NULL; struct ikev2_delete *del; if (initiator) { /* Send PAYLOAD_DELETE */ if ((buf = ibuf_static()) == NULL) goto done; if ((del = ibuf_advance(buf, sizeof(*del))) == NULL) goto done; del->del_protoid = IKEV2_SAPROTO_IKE; del->del_spisize = 0; del->del_nspi = 0; if (ikev2_send_ike_e(env, sa, buf, IKEV2_PAYLOAD_DELETE, IKEV2_EXCHANGE_INFORMATIONAL, 0) == -1) goto done; log_debug("%s: sent delete, closing SA", __func__); done: ibuf_release(buf); sa_state(env, sa, IKEV2_STATE_CLOSED); } else { sa_state(env, sa, IKEV2_STATE_CLOSING); } /* Remove IKE-SA after timeout, e.g. if we don't get a delete */ timer_set(env, &sa->sa_timer, ikev2_ike_sa_timeout, sa); timer_add(env, &sa->sa_timer, IKED_IKE_SA_DELETE_TIMEOUT); } int ikev2_resp_create_child_sa(struct iked *env, struct iked_message *msg) { struct iked_childsa *csa; struct iked_proposal *prop; struct iked_proposals proposals; struct iked_kex *kex, *kextmp = NULL; struct iked_sa *nsa = NULL, *sa = msg->msg_sa; struct iked_spi *spi, *rekey = &msg->msg_rekey; struct ikev2_keyexchange *ke; struct ikev2_payload *pld = NULL; struct ibuf *e = NULL, *nonce = NULL; u_int8_t firstpayload; ssize_t len = 0; int initiator, protoid, rekeying = 1; int ret = -1; int pfs = 0; initiator = sa->sa_hdr.sh_initiator ? 1 : 0; if (!ikev2_msg_frompeer(msg) || msg->msg_prop == NULL) return (0); TAILQ_INIT(&proposals); if ((protoid = rekey->spi_protoid) == 0) { /* * If REKEY_SA notification is not present, then it's either * IKE SA rekeying or the client wants to create additional * CHILD SAs */ if (msg->msg_prop->prop_protoid == IKEV2_SAPROTO_IKE) { protoid = rekey->spi_protoid = IKEV2_SAPROTO_IKE; if (sa->sa_hdr.sh_initiator) rekey->spi = sa->sa_hdr.sh_rspi; else rekey->spi = sa->sa_hdr.sh_ispi; rekey->spi_size = 8; } else { protoid = msg->msg_prop->prop_protoid; rekeying = 0; } } if (rekeying) log_debug("%s: rekey %s spi %s", __func__, print_map(rekey->spi_protoid, ikev2_saproto_map), print_spi(rekey->spi, rekey->spi_size)); else log_debug("%s: creating new %s SA", __func__, print_map(protoid, ikev2_saproto_map)); if (protoid == IKEV2_SAPROTO_IKE) { /* IKE SA rekeying */ spi = &msg->msg_prop->prop_peerspi; if ((nsa = sa_new(env, spi->spi, 0, 0, msg->msg_policy)) == NULL) { log_debug("%s: failed to get new SA", __func__); return (ret); } if (ikev2_sa_responder(env, nsa, sa, msg)) { log_debug("%s: failed to get IKE SA keys", __func__); return (ret); } sa_state(env, nsa, IKEV2_STATE_AUTH_SUCCESS); nonce = nsa->sa_rnonce; kex = &nsa->sa_kex; } else { /* Child SA creating/rekeying */ if ((kex = kextmp = calloc(1, sizeof(*kextmp))) == NULL) { log_debug("%s: calloc kex", __func__); goto fail; } if (ikev2_sa_negotiate(&proposals, &sa->sa_policy->pol_proposals, &msg->msg_proposals) != 0) { log_debug("%s: no proposal chosen", __func__); goto fail; } /* check KE payload for PFS */ if (ibuf_length(msg->msg_parent->msg_ke)) { log_debug("%s: using PFS", __func__); if (ikev2_sa_responder_dh(kex, &proposals, msg->msg_parent, protoid) < 0) { log_debug("%s: failed to setup DH", __func__); goto fail; } pfs = 1; /* XXX check group against policy ? */ } /* Update peer SPI */ TAILQ_FOREACH(prop, &proposals, prop_entry) { if (prop->prop_protoid == protoid) break; } if (prop == NULL) { log_debug("%s: failed to find %s proposals", __func__, print_map(protoid, ikev2_saproto_map)); goto fail; } else prop->prop_peerspi = msg->msg_prop->prop_peerspi; /* Set rekeying flags on Child SAs */ if (rekeying) { if ((csa = childsa_lookup(sa, rekey->spi, rekey->spi_protoid)) == NULL) { log_debug("%s: CHILD SA %s wasn't found", __func__, print_spi(rekey->spi, rekey->spi_size)); goto fail; } if (!csa->csa_loaded || !csa->csa_peersa || !csa->csa_peersa->csa_loaded) { log_debug("%s: SA is not loaded or no peer SA", __func__); goto fail; } csa->csa_rekey = 1; csa->csa_peersa->csa_rekey = 1; } /* Update initiator's nonce */ if (!ibuf_length(msg->msg_nonce)) { log_debug("%s: initiator didn't send nonce", __func__); goto fail; } ibuf_release(kex->kex_inonce); kex->kex_inonce = ibuf_dup(msg->msg_nonce); /* Generate new responder's nonce */ if ((nonce = ibuf_random(IKED_NONCE_SIZE)) == NULL) goto fail; /* Update responder's nonce */ ibuf_release(kex->kex_rnonce); kex->kex_rnonce = nonce; if (ikev2_childsa_negotiate(env, sa, kex, &proposals, 0, pfs)) { log_debug("%s: failed to get CHILD SAs", __func__); goto fail; } } if ((e = ibuf_static()) == NULL) goto done; /* compression (unless IKE rekeying) */ if (!nsa && sa->sa_ipcomp && (len = ikev2_add_ipcompnotify(env, e, &pld, 0, sa)) == -1) goto done; if (pld) { firstpayload = IKEV2_PAYLOAD_NOTIFY; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_SA) == -1) goto done; } else firstpayload = IKEV2_PAYLOAD_SA; /* SA payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((len = ikev2_add_proposals(env, nsa ? nsa : sa, e, nsa ? &nsa->sa_proposals : &proposals, protoid, 0, nsa ? 1 : 0)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONCE) == -1) goto done; /* NONCE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if (ikev2_add_buf(e, nonce) == -1) goto done; len = ibuf_size(nonce); if (protoid == IKEV2_SAPROTO_IKE || pfs) { if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_KE) == -1) goto done; /* KE payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((ke = ibuf_advance(e, sizeof(*ke))) == NULL) goto done; if (kex->kex_dhgroup == NULL) { log_debug("%s: invalid dh", __func__); goto done; } ke->kex_dhgroup = htobe16(kex->kex_dhgroup->id); if (ikev2_add_buf(e, kex->kex_dhrexchange) == -1) goto done; len = sizeof(*ke) + dh_getlen(kex->kex_dhgroup); } if (protoid != IKEV2_SAPROTO_IKE) if ((len = ikev2_add_ts(e, &pld, len, sa, initiator)) == -1) goto done; if (ikev2_next_payload(pld, len, IKEV2_PAYLOAD_NONE) == -1) goto done; if ((ret = ikev2_msg_send_encrypt(env, sa, &e, IKEV2_EXCHANGE_CREATE_CHILD_SA, firstpayload, 1)) == -1) goto done; if (protoid == IKEV2_SAPROTO_IKE) ret = ikev2_ikesa_enable(env, sa, nsa); else ret = ikev2_childsa_enable(env, sa); done: if (ret && protoid != IKEV2_SAPROTO_IKE) ikev2_childsa_delete(env, sa, 0, 0, NULL, 1); ibuf_release(e); config_free_proposals(&proposals, 0); config_free_kex(kextmp); return (ret); fail: config_free_proposals(&proposals, 0); config_free_kex(kextmp); return (-1); } void ikev2_ike_sa_timeout(struct iked *env, void *arg) { struct iked_sa *sa = arg; log_debug("%s: closing SA", __func__); sa_free(env, sa); } void ikev2_ike_sa_alive(struct iked *env, void *arg) { struct iked_sa *sa = arg; struct iked_childsa *csa = NULL; struct timeval tv; u_int64_t last_used, diff; int foundin = 0, foundout = 0; /* check for incoming traffic on any child SA */ TAILQ_FOREACH(csa, &sa->sa_childsas, csa_entry) { if (!csa->csa_loaded || csa->csa_saproto == IKEV2_SAPROTO_IPCOMP) continue; if (pfkey_sa_last_used(env->sc_pfkey, csa, &last_used) != 0) continue; gettimeofday(&tv, NULL); diff = (u_int32_t)(tv.tv_sec - last_used); log_debug("%s: %s CHILD SA spi %s last used %llu second(s) ago", __func__, csa->csa_dir == IPSP_DIRECTION_IN ? "incoming" : "outgoing", print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size), diff); if (diff < IKED_IKE_SA_ALIVE_TIMEOUT) { if (csa->csa_dir == IPSP_DIRECTION_IN) { foundin = 1; break; } else { foundout = 1; } } } /* send probe if any outging SA has been used, but no incoming SA */ if (!foundin && foundout) { log_debug("%s: sending alive check", __func__); ikev2_send_ike_e(env, sa, NULL, IKEV2_PAYLOAD_NONE, IKEV2_EXCHANGE_INFORMATIONAL, 0); sa->sa_stateflags |= IKED_REQ_INF; } /* re-register */ timer_add(env, &sa->sa_timer, IKED_IKE_SA_ALIVE_TIMEOUT); } int ikev2_send_informational(struct iked *env, struct iked_message *msg) { struct iked_message resp; struct ike_header *hdr; struct ikev2_payload *pld; struct ikev2_notify *n; struct iked_sa *sa = msg->msg_sa, sah; struct ibuf *buf, *e = NULL; int ret = -1; if (msg->msg_error == 0) return (0); if ((buf = ikev2_msg_init(env, &resp, &msg->msg_peer, msg->msg_peerlen, &msg->msg_local, msg->msg_locallen, 0)) == NULL) goto done; /* New encrypted message buffer */ if ((e = ibuf_static()) == NULL) goto done; /* NOTIFY payload */ if ((pld = ikev2_add_payload(e)) == NULL) goto done; if ((n = ibuf_advance(e, sizeof(*n))) == NULL) goto done; n->n_protoid = IKEV2_SAPROTO_IKE; /* XXX ESP etc. */ n->n_spisize = 0; n->n_type = htobe16(msg->msg_error); switch (msg->msg_error) { case IKEV2_N_INVALID_IKE_SPI: case IKEV2_N_NO_PROPOSAL_CHOSEN: break; default: log_debug("%s: unsupported notification %s", __func__, print_map(msg->msg_error, ikev2_n_map)); goto done; } if (ikev2_next_payload(pld, sizeof(*n), IKEV2_PAYLOAD_NONE) == -1) goto done; if (sa != NULL && msg->msg_e) { resp.msg_msgid = ikev2_msg_id(env, sa); /* IKE header */ if ((hdr = ikev2_add_header(buf, sa, resp.msg_msgid, IKEV2_PAYLOAD_SK, IKEV2_EXCHANGE_INFORMATIONAL, 0)) == NULL) goto done; if ((pld = ikev2_add_payload(buf)) == NULL) goto done; /* Encrypt message and add as an E payload */ if ((e = ikev2_msg_encrypt(env, sa, e)) == NULL) { log_debug("%s: encryption failed", __func__); goto done; } if (ibuf_cat(buf, e) != 0) goto done; if (ikev2_next_payload(pld, ibuf_size(e), IKEV2_PAYLOAD_NOTIFY) == -1) goto done; if (ikev2_set_header(hdr, ibuf_size(buf) - sizeof(*hdr)) == -1) goto done; /* Add integrity checksum (HMAC) */ if (ikev2_msg_integr(env, sa, buf) != 0) { log_debug("%s: integrity checksum failed", __func__); goto done; } } else { if ((hdr = ibuf_seek(msg->msg_data, 0, sizeof(*hdr))) == NULL) goto done; bzero(&sah, sizeof(sah)); sah.sa_hdr.sh_rspi = betoh64(hdr->ike_rspi); sah.sa_hdr.sh_ispi = betoh64(hdr->ike_ispi); sah.sa_hdr.sh_initiator = hdr->ike_flags & IKEV2_FLAG_INITIATOR ? 0 : 1; resp.msg_msgid = ikev2_msg_id(env, &sah); /* IKE header */ if ((hdr = ikev2_add_header(buf, &sah, resp.msg_msgid, IKEV2_PAYLOAD_NOTIFY, IKEV2_EXCHANGE_INFORMATIONAL, 0)) == NULL) goto done; if (ibuf_cat(buf, e) != 0) goto done; if (ikev2_set_header(hdr, ibuf_size(buf) - sizeof(*hdr)) == -1) goto done; } resp.msg_data = buf; resp.msg_fd = msg->msg_fd; TAILQ_INIT(&resp.msg_proposals); ret = ikev2_msg_send(env, &resp); done: ibuf_release(e); ikev2_msg_cleanup(env, &resp); return (ret); } ssize_t ikev2_psk(struct iked_sa *sa, u_int8_t *data, size_t length, u_int8_t **pskptr) { u_int8_t *psk; size_t psklen = -1; if (hash_setkey(sa->sa_prf, data, length) == NULL) return (-1); if ((psk = calloc(1, hash_keylength(sa->sa_prf))) == NULL) return (-1); hash_init(sa->sa_prf); hash_update(sa->sa_prf, IKEV2_KEYPAD, strlen(IKEV2_KEYPAD)); hash_final(sa->sa_prf, psk, &psklen); *pskptr = psk; return (psklen); } int ikev2_match_proposals(struct iked_proposal *local, struct iked_proposal *peer, struct iked_transform **xforms) { struct iked_transform *tpeer, *tlocal; u_int i, j, type, score; u_int8_t protoid = peer->prop_protoid; for (i = 0; i < peer->prop_nxforms; i++) { tpeer = peer->prop_xforms + i; for (j = 0; j < local->prop_nxforms; j++) { tlocal = local->prop_xforms + j; if (tpeer->xform_type != tlocal->xform_type || tpeer->xform_id != tlocal->xform_id || tpeer->xform_length != tlocal->xform_length) continue; if (tpeer->xform_type > IKEV2_XFORMTYPE_MAX) continue; type = tpeer->xform_type; if (xforms[type] == NULL || tlocal->xform_score < xforms[type]->xform_score) { xforms[type] = tlocal; } else continue; print_debug("%s: xform %d <-> %d (%d): %s %s " "(keylength %d <-> %d)", __func__, peer->prop_id, local->prop_id, tlocal->xform_score, print_map(type, ikev2_xformtype_map), print_map(tpeer->xform_id, tpeer->xform_map), tpeer->xform_keylength, tlocal->xform_keylength); if (tpeer->xform_length) print_debug(" %d", tpeer->xform_length); print_debug("\n"); } } for (i = score = 0; i < IKEV2_XFORMTYPE_MAX; i++) { if (protoid == IKEV2_SAPROTO_IKE && xforms[i] == NULL && (i == IKEV2_XFORMTYPE_ENCR || i == IKEV2_XFORMTYPE_PRF || i == IKEV2_XFORMTYPE_INTEGR || i == IKEV2_XFORMTYPE_DH)) { score = 0; break; } else if (protoid == IKEV2_SAPROTO_AH && xforms[i] == NULL && (i == IKEV2_XFORMTYPE_INTEGR || i == IKEV2_XFORMTYPE_ESN)) { score = 0; break; } else if (protoid == IKEV2_SAPROTO_ESP && xforms[i] == NULL && (i == IKEV2_XFORMTYPE_ENCR || i == IKEV2_XFORMTYPE_ESN)) { score = 0; break; } else if (xforms[i] == NULL) continue; score += xforms[i]->xform_score; } return (score); } int ikev2_sa_negotiate(struct iked_proposals *result, struct iked_proposals *local, struct iked_proposals *peer) { struct iked_proposal *ppeer = NULL, *plocal, *prop, vpeer, vlocal; struct iked_transform chosen[IKEV2_XFORMTYPE_MAX]; struct iked_transform *valid[IKEV2_XFORMTYPE_MAX]; struct iked_transform *match[IKEV2_XFORMTYPE_MAX]; u_int i, score, chosen_score = 0; u_int8_t protoid = 0; bzero(valid, sizeof(valid)); bzero(&vlocal, sizeof(vlocal)); bzero(&vpeer, sizeof(vpeer)); if (TAILQ_EMPTY(peer)) { log_debug("%s: peer did not send %s proposals", __func__, print_map(protoid, ikev2_saproto_map)); return (-1); } TAILQ_FOREACH(plocal, local, prop_entry) { TAILQ_FOREACH(ppeer, peer, prop_entry) { if (ppeer->prop_protoid != plocal->prop_protoid) continue; bzero(match, sizeof(match)); score = ikev2_match_proposals(plocal, ppeer, match); log_debug("%s: score %d", __func__, score); if (score && (!chosen_score || score < chosen_score)) { chosen_score = score; for (i = 0; i < IKEV2_XFORMTYPE_MAX; i++) { if ((valid[i] = match[i])) memcpy(&chosen[i], match[i], sizeof(chosen[0])); } memcpy(&vpeer, ppeer, sizeof(vpeer)); memcpy(&vlocal, plocal, sizeof(vlocal)); } } if (chosen_score != 0) break; } if (chosen_score == 0) return (-1); else if (result == NULL) return (0); (void)config_free_proposals(result, vpeer.prop_protoid); prop = config_add_proposal(result, vpeer.prop_id, vpeer.prop_protoid); if (vpeer.prop_localspi.spi_size) { prop->prop_localspi.spi_size = vpeer.prop_localspi.spi_size; prop->prop_peerspi = vpeer.prop_peerspi; } if (vlocal.prop_localspi.spi_size) { prop->prop_localspi.spi_size = vlocal.prop_localspi.spi_size; prop->prop_localspi.spi = vlocal.prop_localspi.spi; } for (i = 0; i < IKEV2_XFORMTYPE_MAX; i++) { if (valid[i] == NULL) continue; print_debug("%s: score %d: %s %s", __func__, chosen[i].xform_score, print_map(i, ikev2_xformtype_map), print_map(chosen[i].xform_id, chosen[i].xform_map)); if (chosen[i].xform_length) print_debug(" %d", chosen[i].xform_length); print_debug("\n"); if (config_add_transform(prop, chosen[i].xform_type, chosen[i].xform_id, chosen[i].xform_length, chosen[i].xform_keylength) == NULL) break; } return (0); } int ikev2_sa_initiator_dh(struct iked_sa *sa, struct iked_message *msg, u_int proto) { struct iked_policy *pol = sa->sa_policy; struct iked_transform *xform; if (sa->sa_dhgroup == NULL) { if ((xform = config_findtransform(&pol->pol_proposals, IKEV2_XFORMTYPE_DH, proto)) == NULL) { log_debug("%s: did not find dh transform", __func__); return (-1); } if ((sa->sa_dhgroup = group_get(xform->xform_id)) == NULL) { log_debug("%s: invalid dh %d", __func__, xform->xform_id); return (-1); } } if (!ibuf_length(sa->sa_dhiexchange)) { if ((sa->sa_dhiexchange = ibuf_new(NULL, dh_getlen(sa->sa_dhgroup))) == NULL) { log_debug("%s: failed to alloc dh exchange", __func__); return (-1); } if (dh_create_exchange(sa->sa_dhgroup, sa->sa_dhiexchange->buf) == -1) { log_debug("%s: failed to get dh exchange", __func__); return (-1); } } /* Initial message */ if (msg == NULL) return (0); if (!ibuf_length(sa->sa_dhrexchange)) { if (!ibuf_length(msg->msg_ke)) { log_debug("%s: invalid peer dh exchange", __func__); return (-1); } if ((ssize_t)ibuf_length(msg->msg_ke) != dh_getlen(sa->sa_dhgroup)) { log_debug("%s: invalid dh length, size %d", __func__, dh_getlen(sa->sa_dhgroup) * 8); return (-1); } if ((sa->sa_dhrexchange = ibuf_dup(msg->msg_ke)) == NULL) { log_debug("%s: failed to copy dh exchange", __func__); return (-1); } } /* Set a pointer to the peer exchange */ sa->sa_dhpeer = sa->sa_dhrexchange; return (0); } int ikev2_sa_initiator(struct iked *env, struct iked_sa *sa, struct iked_sa *osa, struct iked_message *msg) { struct iked_transform *xform; if (ikev2_sa_initiator_dh(sa, msg, 0) < 0) return (-1); if (!ibuf_length(sa->sa_inonce)) { if ((sa->sa_inonce = ibuf_random(IKED_NONCE_SIZE)) == NULL) { log_debug("%s: failed to get local nonce", __func__); return (-1); } } /* Initial message */ if (msg == NULL) return (0); if (!ibuf_length(sa->sa_rnonce)) { if (!ibuf_length(msg->msg_nonce)) { log_debug("%s: invalid peer nonce", __func__); return (-1); } if ((sa->sa_rnonce = ibuf_dup(msg->msg_nonce)) == NULL) { log_debug("%s: failed to get peer nonce", __func__); return (-1); } } /* XXX we need a better way to get this */ if (ikev2_sa_negotiate(&sa->sa_proposals, &msg->msg_policy->pol_proposals, &msg->msg_proposals) != 0) { log_debug("%s: no proposal chosen", __func__); msg->msg_error = IKEV2_N_NO_PROPOSAL_CHOSEN; return (-1); } else if (sa_stateok(sa, IKEV2_STATE_SA_INIT)) sa_stateflags(sa, IKED_REQ_SA); if (sa->sa_encr == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_ENCR, 0)) == NULL) { log_debug("%s: did not find encr transform", __func__); return (-1); } if ((sa->sa_encr = cipher_new(xform->xform_type, xform->xform_id, xform->xform_length)) == NULL) { log_debug("%s: failed to get encr", __func__); return (-1); } } if (sa->sa_prf == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_PRF, 0)) == NULL) { log_debug("%s: did not find prf transform", __func__); return (-1); } if ((sa->sa_prf = hash_new(xform->xform_type, xform->xform_id)) == NULL) { log_debug("%s: failed to get prf", __func__); return (-1); } } if (sa->sa_integr == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_INTEGR, 0)) == NULL) { log_debug("%s: did not find integr transform", __func__); return (-1); } if ((sa->sa_integr = hash_new(xform->xform_type, xform->xform_id)) == NULL) { log_debug("%s: failed to get integr", __func__); return (-1); } } ibuf_release(sa->sa_2ndmsg); if ((sa->sa_2ndmsg = ibuf_dup(msg->msg_data)) == NULL) { log_debug("%s: failed to copy 2nd message", __func__); return (-1); } return (ikev2_sa_keys(env, sa, osa ? osa->sa_key_d : NULL)); } int ikev2_sa_responder_dh(struct iked_kex *kex, struct iked_proposals *proposals, struct iked_message *msg, u_int proto) { struct iked_transform *xform; if (kex->kex_dhgroup == NULL) { if ((xform = config_findtransform(proposals, IKEV2_XFORMTYPE_DH, proto)) == NULL) { log_debug("%s: did not find dh transform", __func__); return (-1); } if ((kex->kex_dhgroup = group_get(xform->xform_id)) == NULL) { log_debug("%s: invalid dh %d", __func__, xform->xform_id); return (-1); } } if (!ibuf_length(kex->kex_dhrexchange)) { if ((kex->kex_dhrexchange = ibuf_new(NULL, dh_getlen(kex->kex_dhgroup))) == NULL) { log_debug("%s: failed to alloc dh exchange", __func__); return (-1); } if (dh_create_exchange(kex->kex_dhgroup, kex->kex_dhrexchange->buf) == -1) { log_debug("%s: failed to get dh exchange", __func__); return (-1); } } if (!ibuf_length(kex->kex_dhiexchange)) { if ((kex->kex_dhiexchange = ibuf_dup(msg->msg_ke)) == NULL || ((ssize_t)ibuf_length(kex->kex_dhiexchange) != dh_getlen(kex->kex_dhgroup))) { /* XXX send notification to peer */ log_debug("%s: invalid dh, size %d", __func__, dh_getlen(kex->kex_dhgroup) * 8); return (-1); } } /* Set a pointer to the peer exchange */ kex->kex_dhpeer = kex->kex_dhiexchange; return (0); } int ikev2_sa_responder(struct iked *env, struct iked_sa *sa, struct iked_sa *osa, struct iked_message *msg) { struct iked_transform *xform; sa_state(env, sa, IKEV2_STATE_SA_INIT); ibuf_release(sa->sa_1stmsg); if ((sa->sa_1stmsg = ibuf_dup(msg->msg_data)) == NULL) { log_debug("%s: failed to copy 1st message", __func__); return (-1); } if (!ibuf_length(sa->sa_rnonce) && (sa->sa_rnonce = ibuf_random(IKED_NONCE_SIZE)) == NULL) { log_debug("%s: failed to get local nonce", __func__); return (-1); } if (!ibuf_length(sa->sa_inonce) && ((ibuf_length(msg->msg_nonce) < IKED_NONCE_MIN) || (sa->sa_inonce = ibuf_dup(msg->msg_nonce)) == NULL)) { log_debug("%s: failed to get peer nonce", __func__); return (-1); } /* XXX we need a better way to get this */ if (ikev2_sa_negotiate(&sa->sa_proposals, &msg->msg_policy->pol_proposals, &msg->msg_proposals) != 0) { log_debug("%s: no proposal chosen", __func__); msg->msg_error = IKEV2_N_NO_PROPOSAL_CHOSEN; return (-1); } else if (sa_stateok(sa, IKEV2_STATE_SA_INIT)) sa_stateflags(sa, IKED_REQ_SA); if (sa->sa_encr == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_ENCR, 0)) == NULL) { log_debug("%s: did not find encr transform", __func__); return (-1); } if ((sa->sa_encr = cipher_new(xform->xform_type, xform->xform_id, xform->xform_length)) == NULL) { log_debug("%s: failed to get encr", __func__); return (-1); } } if (sa->sa_prf == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_PRF, 0)) == NULL) { log_debug("%s: did not find prf transform", __func__); return (-1); } if ((sa->sa_prf = hash_new(xform->xform_type, xform->xform_id)) == NULL) { log_debug("%s: failed to get prf", __func__); return (-1); } } if (sa->sa_integr == NULL) { if ((xform = config_findtransform(&sa->sa_proposals, IKEV2_XFORMTYPE_INTEGR, 0)) == NULL) { log_debug("%s: did not find integr transform", __func__); return (-1); } if ((sa->sa_integr = hash_new(xform->xform_type, xform->xform_id)) == NULL) { log_debug("%s: failed to get integr", __func__); return (-1); } } if (ikev2_sa_responder_dh(&sa->sa_kex, &sa->sa_proposals, msg, 0) < 0) return (-1); return (ikev2_sa_keys(env, sa, osa ? osa->sa_key_d : NULL)); } int ikev2_sa_keys(struct iked *env, struct iked_sa *sa, struct ibuf *key) { struct iked_hash *prf, *integr; struct iked_cipher *encr; struct group *group; struct ibuf *ninr, *dhsecret, *skeyseed, *s, *t; size_t nonceminlen, ilen, rlen, tmplen; u_int64_t ispi, rspi; int ret = -1; ninr = dhsecret = skeyseed = s = t = NULL; if ((encr = sa->sa_encr) == NULL || (prf = sa->sa_prf) == NULL || (integr = sa->sa_integr) == NULL || (group = sa->sa_dhgroup) == NULL) { log_debug("%s: failed to get key input data", __func__); return (-1); } if (prf->hash_fixedkey) nonceminlen = prf->hash_fixedkey; else nonceminlen = IKED_NONCE_MIN; /* Nonces need a minimal size and should have an even length */ if (ibuf_length(sa->sa_inonce) < nonceminlen || (ibuf_length(sa->sa_inonce) % 2) != 0 || ibuf_length(sa->sa_rnonce) < nonceminlen || (ibuf_length(sa->sa_rnonce) % 2) != 0) { log_debug("%s: invalid nonces", __func__); return (-1); } if (prf->hash_fixedkey) { /* Half of the key bits must come from Ni, and half from Nr */ ilen = prf->hash_fixedkey / 2; rlen = prf->hash_fixedkey / 2; } else { /* Most PRF functions accept a variable-length key */ ilen = ibuf_length(sa->sa_inonce); rlen = ibuf_length(sa->sa_rnonce); } /* * Depending on whether we're generating new keying material * or rekeying existing SA the algorithm is different. If the * "key" argument is not specified a concatenation of nonces * (Ni | Nr) is used as a PRF key, otherwise a "key" buffer * is used and PRF is performed on the concatenation of DH * exchange result and nonces (g^ir | Ni | Nr). See sections * 2.14 and 2.18 of RFC5996 for more information. */ /* * Generate g^ir */ if ((dhsecret = ibuf_new(NULL, dh_getlen(group))) == NULL) { log_debug("%s: failed to alloc dh secret", __func__); goto done; } if (dh_create_shared(group, dhsecret->buf, sa->sa_dhpeer->buf) == -1) { log_debug("%s: failed to get dh secret" " group %d len %d secret %zu exchange %zu", __func__, group->id, dh_getlen(group), ibuf_length(dhsecret), ibuf_length(sa->sa_dhpeer)); goto done; } if (!key) { /* * Set PRF key to generate SKEEYSEED = prf(Ni | Nr, g^ir) */ if ((ninr = ibuf_new(sa->sa_inonce->buf, ilen)) == NULL || ibuf_add(ninr, sa->sa_rnonce->buf, rlen) != 0) { log_debug("%s: failed to get nonce key buffer", __func__); goto done; } key = ninr; } else { /* * Set PRF key to generate SKEEYSEED = prf(key, g^ir | Ni | Nr) */ if (ibuf_add(dhsecret, sa->sa_inonce->buf, ilen) != 0 || ibuf_add(dhsecret, sa->sa_rnonce->buf, rlen) != 0) { log_debug("%s: failed to get nonce key buffer", __func__); goto done; } } if ((hash_setkey(prf, key->buf, ibuf_length(key))) == NULL) { log_debug("%s: failed to set prf key", __func__); goto done; } if ((skeyseed = ibuf_new(NULL, hash_length(prf))) == NULL) { log_debug("%s: failed to get SKEYSEED buffer", __func__); goto done; } tmplen = 0; hash_init(prf); hash_update(prf, dhsecret->buf, ibuf_length(dhsecret)); hash_final(prf, skeyseed->buf, &tmplen); log_debug("%s: SKEYSEED with %zu bytes", __func__, tmplen); print_hex(skeyseed->buf, 0, tmplen); if (ibuf_setsize(skeyseed, tmplen) == -1) { log_debug("%s: failed to set keymaterial length", __func__); goto done; } /* * Now generate the key material * * S = Ni | Nr | SPIi | SPIr */ /* S = Ni | Nr | SPIi | SPIr */ ilen = ibuf_length(sa->sa_inonce); rlen = ibuf_length(sa->sa_rnonce); ispi = htobe64(sa->sa_hdr.sh_ispi); rspi = htobe64(sa->sa_hdr.sh_rspi); if ((s = ibuf_new(sa->sa_inonce->buf, ilen)) == NULL || ibuf_add(s, sa->sa_rnonce->buf, rlen) != 0 || ibuf_add(s, &ispi, sizeof(ispi)) != 0 || ibuf_add(s, &rspi, sizeof(rspi)) != 0) { log_debug("%s: failed to set S buffer", __func__); goto done; } log_debug("%s: S with %zu bytes", __func__, ibuf_length(s)); print_hex(s->buf, 0, ibuf_length(s)); /* * Get the size of the key material we need and the number * of rounds we need to run the prf+ function. */ ilen = hash_length(prf) + /* SK_d */ hash_keylength(integr) + /* SK_ai */ hash_keylength(integr) + /* SK_ar */ cipher_keylength(encr) + /* SK_ei */ cipher_keylength(encr) + /* SK_er */ hash_keylength(prf) + /* SK_pi */ hash_keylength(prf); /* SK_pr */ if ((t = ikev2_prfplus(prf, skeyseed, s, ilen)) == NULL) { log_debug("%s: failed to get IKE SA key material", __func__); goto done; } /* ibuf_get() returns a new buffer from the next read offset */ if ((sa->sa_key_d = ibuf_get(t, hash_length(prf))) == NULL || (sa->sa_key_iauth = ibuf_get(t, hash_keylength(integr))) == NULL || (sa->sa_key_rauth = ibuf_get(t, hash_keylength(integr))) == NULL || (sa->sa_key_iencr = ibuf_get(t, cipher_keylength(encr))) == NULL || (sa->sa_key_rencr = ibuf_get(t, cipher_keylength(encr))) == NULL || (sa->sa_key_iprf = ibuf_get(t, hash_length(prf))) == NULL || (sa->sa_key_rprf = ibuf_get(t, hash_length(prf))) == NULL) { log_debug("%s: failed to get SA keys", __func__); goto done; } log_debug("%s: SK_d with %zu bytes", __func__, ibuf_length(sa->sa_key_d)); print_hex(sa->sa_key_d->buf, 0, ibuf_length(sa->sa_key_d)); log_debug("%s: SK_ai with %zu bytes", __func__, ibuf_length(sa->sa_key_iauth)); print_hex(sa->sa_key_iauth->buf, 0, ibuf_length(sa->sa_key_iauth)); log_debug("%s: SK_ar with %zu bytes", __func__, ibuf_length(sa->sa_key_rauth)); print_hex(sa->sa_key_rauth->buf, 0, ibuf_length(sa->sa_key_rauth)); log_debug("%s: SK_ei with %zu bytes", __func__, ibuf_length(sa->sa_key_iencr)); print_hex(sa->sa_key_iencr->buf, 0, ibuf_length(sa->sa_key_iencr)); log_debug("%s: SK_er with %zu bytes", __func__, ibuf_length(sa->sa_key_rencr)); print_hex(sa->sa_key_rencr->buf, 0, ibuf_length(sa->sa_key_rencr)); log_debug("%s: SK_pi with %zu bytes", __func__, ibuf_length(sa->sa_key_iprf)); print_hex(sa->sa_key_iprf->buf, 0, ibuf_length(sa->sa_key_iprf)); log_debug("%s: SK_pr with %zu bytes", __func__, ibuf_length(sa->sa_key_rprf)); print_hex(sa->sa_key_rprf->buf, 0, ibuf_length(sa->sa_key_rprf)); ret = 0; done: ibuf_release(ninr); ibuf_release(dhsecret); ibuf_release(skeyseed); ibuf_release(s); ibuf_release(t); return (ret); } void ikev2_sa_cleanup_dh(struct iked_sa *sa) { ibuf_release(sa->sa_dhiexchange); ibuf_release(sa->sa_dhrexchange); group_free(sa->sa_dhgroup); sa->sa_dhiexchange = NULL; sa->sa_dhrexchange = NULL; sa->sa_dhgroup = NULL; } struct ibuf * ikev2_prfplus(struct iked_hash *prf, struct ibuf *key, struct ibuf *seed, size_t keymatlen) { struct ibuf *t = NULL, *t1 = NULL, *t2 = NULL; size_t rlen, i, hashlen = 0; u_int8_t pad = 0; /* * prf+ (K, S) = T1 | T2 | T3 | T4 | ... * * T1 = prf (K, S | 0x01) * T2 = prf (K, T1 | S | 0x02) * T3 = prf (K, T2 | S | 0x03) * T4 = prf (K, T3 | S | 0x04) */ if ((hash_setkey(prf, ibuf_data(key), ibuf_size(key))) == NULL) { log_debug("%s: failed to set prf+ key", __func__); goto fail; } if ((t = ibuf_new(NULL, 0)) == NULL) { log_debug("%s: failed to get T buffer", __func__); goto fail; } rlen = roundup(keymatlen, hash_length(prf)) / hash_length(prf); if (rlen > 255) fatalx("ikev2_prfplus: key material too large"); for (i = 0; i < rlen; i++) { if (t1 != NULL) { t2 = ibuf_new(t1->buf, ibuf_length(t1)); ibuf_release(t1); } else t2 = ibuf_new(NULL, 0); t1 = ibuf_new(NULL, hash_length(prf)); ibuf_add(t2, seed->buf, ibuf_length(seed)); pad = i + 1; ibuf_add(t2, &pad, 1); hash_init(prf); hash_update(prf, t2->buf, ibuf_length(t2)); hash_final(prf, t1->buf, &hashlen); if (hashlen != hash_length(prf)) fatalx("ikev2_prfplus: hash length mismatch"); ibuf_release(t2); ibuf_add(t, t1->buf, ibuf_length(t1)); log_debug("%s: T%d with %zu bytes", __func__, pad, ibuf_length(t1)); print_hex(t1->buf, 0, ibuf_length(t1)); } log_debug("%s: Tn with %zu bytes", __func__, ibuf_length(t)); print_hex(t->buf, 0, ibuf_length(t)); ibuf_release(t1); return (t); fail: ibuf_release(t1); ibuf_release(t); return (NULL); } int ikev2_sa_tag(struct iked_sa *sa, struct iked_id *id) { char *format, *domain = NULL, *idrepl = NULL; char idstr[IKED_ID_SIZE]; int ret = -1; size_t len; if (sa->sa_tag != NULL) free(sa->sa_tag); sa->sa_tag = NULL; format = sa->sa_policy->pol_tag; len = IKED_TAG_SIZE; if ((sa->sa_tag = calloc(1, len)) == NULL) { log_debug("%s: calloc", __func__); goto fail; } if (strlcpy(sa->sa_tag, format, len) >= len) { log_debug("%s: tag too long", __func__); goto fail; } if (ikev2_print_id(id, idstr, sizeof(idstr)) == -1) { log_debug("%s: invalid id", __func__); goto fail; } /* ASN.1 DER IDs are too long, use the CN part instead */ if ((id->id_type == IKEV2_ID_ASN1_DN) && (idrepl = strstr(idstr, "CN=")) != NULL) { domain = strstr(idrepl, "emailAddress="); idrepl[strcspn(idrepl, "/")] = '\0'; } else idrepl = idstr; if (strstr(format, "$id") != NULL) { if (expand_string(sa->sa_tag, len, "$id", idrepl) != 0) { log_debug("%s: failed to expand tag", __func__); goto fail; } } if (strstr(format, "$name") != NULL) { if (expand_string(sa->sa_tag, len, "$name", sa->sa_policy->pol_name) != 0) { log_debug("%s: failed to expand tag", __func__); goto fail; } } if (strstr(format, "$domain") != NULL) { if (id->id_type == IKEV2_ID_FQDN) domain = strchr(idrepl, '.'); else if (id->id_type == IKEV2_ID_UFQDN) domain = strchr(idrepl, '@'); else if (*idstr == '/' && domain != NULL) domain = strchr(domain, '@'); else domain = NULL; if (domain == NULL || strlen(domain) < 2) { log_debug("%s: no valid domain in ID %s", __func__, idstr); goto fail; } domain++; if (expand_string(sa->sa_tag, len, "$domain", domain) != 0) { log_debug("%s: failed to expand tag", __func__); goto fail; } } log_debug("%s: %s (%zu)", __func__, sa->sa_tag, strlen(sa->sa_tag)); ret = 0; fail: if (ret != 0) { free(sa->sa_tag); sa->sa_tag = NULL; } return (ret); } int ikev2_childsa_negotiate(struct iked *env, struct iked_sa *sa, struct iked_kex *kex, struct iked_proposals *proposals, int initiator, int pfs) { struct iked_proposal *prop; struct iked_transform *xform, *encrxf = NULL, *integrxf = NULL; struct iked_childsa *csa, *csb; struct iked_flow *flow, *saflow, *flowa, *flowb; struct ibuf *keymat = NULL, *seed = NULL, *dhsecret = NULL; struct group *group; u_int32_t spi = 0; u_int i; size_t ilen = 0; int esn, skip, ret = -1; if (!sa_stateok(sa, IKEV2_STATE_VALID)) return (-1); if (ikev2_sa_tag(sa, IKESA_DSTID(sa)) == -1) return (-1); /* We need to determine the key material length first */ TAILQ_FOREACH(prop, proposals, prop_entry) { if (prop->prop_protoid == IKEV2_SAPROTO_IKE) continue; log_debug("%s: proposal %d", __func__, prop->prop_id); for (i = 0; i < prop->prop_nxforms; i++) { xform = prop->prop_xforms + i; xform->xform_keylength = keylength_xf(prop->prop_protoid, xform->xform_type, xform->xform_id); switch (xform->xform_type) { case IKEV2_XFORMTYPE_ENCR: case IKEV2_XFORMTYPE_INTEGR: if (xform->xform_length) xform->xform_keylength = xform->xform_length; xform->xform_keylength += noncelength_xf(xform->xform_type, xform->xform_id); ilen += xform->xform_keylength / 8; break; } } } /* double key material length for inbound/outbound */ ilen *= 2; log_debug("%s: key material length %zu", __func__, ilen); if ((seed = ibuf_new(NULL, 0)) == NULL) { log_debug("%s: failed to setup IKE SA key material", __func__); goto done; } if (pfs) { log_debug("%s: using PFS", __func__); if (kex->kex_dhpeer == NULL || ibuf_length(kex->kex_dhpeer) == 0 || (group = kex->kex_dhgroup) == NULL) { log_debug("%s: no dh group for pfs", __func__); goto done; } if ((dhsecret = ibuf_new(NULL, dh_getlen(group))) == NULL) { log_debug("%s: failed to alloc dh secret", __func__); goto done; } if (dh_create_shared(group, dhsecret->buf, kex->kex_dhpeer->buf) == -1) { log_debug("%s: failed to get dh secret" " group %d len %d secret %zu exchange %zu", __func__, group->id, dh_getlen(group), ibuf_length(dhsecret), ibuf_length(kex->kex_dhpeer)); goto done; } if (ibuf_cat(seed, dhsecret) != 0) { log_debug("%s: failed to set dh secret", __func__); goto done; } } if (ibuf_cat(seed, kex->kex_inonce) != 0 || ibuf_cat(seed, kex->kex_rnonce) != 0 || (keymat = ikev2_prfplus(sa->sa_prf, sa->sa_key_d, seed, ilen)) == NULL) { log_debug("%s: failed to get IKE SA key material", __func__); goto done; } /* Create the new flows */ TAILQ_FOREACH(prop, proposals, prop_entry) { if (ikev2_valid_proposal(prop, NULL, NULL, NULL) != 0) continue; RB_FOREACH(flow, iked_flows, &sa->sa_policy->pol_flows) { skip = 0; TAILQ_FOREACH(saflow, &sa->sa_flows, flow_entry) { if (IKED_ADDR_EQ(&saflow->flow_src, &flow->flow_src) && IKED_ADDR_EQ(&saflow->flow_dst, &flow->flow_dst) && saflow->flow_saproto == prop->prop_protoid) { skip = 1; break; } } if (skip) continue; if ((flowa = calloc(1, sizeof(*flowa))) == NULL) { log_debug("%s: failed to get flow", __func__); goto done; } memcpy(flowa, flow, sizeof(*flow)); flowa->flow_dir = IPSP_DIRECTION_OUT; flowa->flow_saproto = prop->prop_protoid; flowa->flow_local = &sa->sa_local; flowa->flow_peer = &sa->sa_peer; flowa->flow_ikesa = sa; ikev2_cp_fixaddr(sa, &flow->flow_dst, &flowa->flow_dst); if ((flowb = calloc(1, sizeof(*flowb))) == NULL) { log_debug("%s: failed to get flow", __func__); flow_free(flowa); goto done; } memcpy(flowb, flowa, sizeof(*flow)); flowb->flow_dir = IPSP_DIRECTION_IN; memcpy(&flowb->flow_src, &flow->flow_dst, sizeof(flow->flow_dst)); memcpy(&flowb->flow_dst, &flow->flow_src, sizeof(flow->flow_src)); ikev2_cp_fixaddr(sa, &flow->flow_dst, &flowb->flow_src); TAILQ_INSERT_TAIL(&sa->sa_flows, flowa, flow_entry); TAILQ_INSERT_TAIL(&sa->sa_flows, flowb, flow_entry); } } /* create the CHILD SAs using the key material */ TAILQ_FOREACH(prop, proposals, prop_entry) { if (ikev2_valid_proposal(prop, &encrxf, &integrxf, &esn) != 0) continue; spi = 0; if ((csa = calloc(1, sizeof(*csa))) == NULL) { log_debug("%s: failed to get CHILD SA", __func__); goto done; } csa->csa_saproto = prop->prop_protoid; csa->csa_ikesa = sa; csa->csa_spi.spi_protoid = prop->prop_protoid; csa->csa_esn = esn; /* Set up responder's SPIs */ if (initiator) { csa->csa_dir = IPSP_DIRECTION_OUT; csa->csa_local = &sa->sa_local; csa->csa_peer = &sa->sa_peer; csa->csa_peerspi = prop->prop_localspi.spi; csa->csa_spi.spi = prop->prop_peerspi.spi; csa->csa_spi.spi_size = prop->prop_peerspi.spi_size; } else { csa->csa_dir = IPSP_DIRECTION_IN; csa->csa_local = &sa->sa_peer; csa->csa_peer = &sa->sa_local; if ((ret = pfkey_sa_init(env->sc_pfkey, csa, &spi)) != 0) goto done; csa->csa_allocated = 1; csa->csa_peerspi = prop->prop_peerspi.spi; csa->csa_spi.spi = prop->prop_localspi.spi = spi; csa->csa_spi.spi_size = 4; } if (encrxf && (csa->csa_encrkey = ibuf_get(keymat, encrxf->xform_keylength / 8)) == NULL) { log_debug("%s: failed to get CHILD SA encryption key", __func__); childsa_free(csa); goto done; } if (integrxf && (csa->csa_integrkey = ibuf_get(keymat, integrxf->xform_keylength / 8)) == NULL) { log_debug("%s: failed to get CHILD SA integrity key", __func__); childsa_free(csa); goto done; } if (encrxf) csa->csa_encrid = encrxf->xform_id; if (integrxf) csa->csa_integrid = integrxf->xform_id; if ((csb = calloc(1, sizeof(*csb))) == NULL) { log_debug("%s: failed to get CHILD SA", __func__); childsa_free(csa); goto done; } memcpy(csb, csa, sizeof(*csb)); /* Set up initiator's SPIs */ csb->csa_spi.spi = csa->csa_peerspi; csb->csa_peerspi = csa->csa_spi.spi; csb->csa_allocated = csa->csa_allocated ? 0 : 1; csb->csa_dir = csa->csa_dir == IPSP_DIRECTION_IN ? IPSP_DIRECTION_OUT : IPSP_DIRECTION_IN; csb->csa_local = csa->csa_peer; csb->csa_peer = csa->csa_local; if (encrxf && (csb->csa_encrkey = ibuf_get(keymat, encrxf->xform_keylength / 8)) == NULL) { log_debug("%s: failed to get CHILD SA encryption key", __func__); childsa_free(csa); childsa_free(csb); goto done; } if (integrxf && (csb->csa_integrkey = ibuf_get(keymat, integrxf->xform_keylength / 8)) == NULL) { log_debug("%s: failed to get CHILD SA integrity key", __func__); childsa_free(csa); childsa_free(csb); goto done; } TAILQ_INSERT_TAIL(&sa->sa_childsas, csa, csa_entry); TAILQ_INSERT_TAIL(&sa->sa_childsas, csb, csa_entry); csa->csa_peersa = csb; csb->csa_peersa = csa; } ret = 0; done: ibuf_release(dhsecret); ibuf_release(keymat); ibuf_release(seed); return (ret); } /* free a replaced IPCOMP SA */ void ikev2_ipcomp_csa_free(struct iked *env, struct iked_childsa *csa) { if (csa->csa_children) fatalx("ikev2_ipcomp_csa_free: has children"); if (csa->csa_ikesa) TAILQ_REMOVE(&csa->csa_ikesa->sa_childsas, csa, csa_entry); if (csa->csa_loaded) { log_debug("%s: csa %p loaded: calling pfkey_sa_delete", __func__, csa); pfkey_sa_delete(env->sc_pfkey, csa); RB_REMOVE(iked_activesas, &env->sc_activesas, csa); } childsa_free(csa); } int ikev2_ipcomp_enable(struct iked *env, struct iked_sa *sa) { struct iked_childsa *other, *nother, *csa = NULL, *csb = NULL; struct iked_flow *flow, *flowa = NULL, *flowb = NULL; struct iked_flow *nflow, *oflow; if ((csa = calloc(1, sizeof(*csa))) == NULL || (csb = calloc(1, sizeof(*csb))) == NULL || (flowa = calloc(1, sizeof(*flowa))) == NULL || (flowb = calloc(1, sizeof(*flowb))) == NULL) { free(csa); free(csb); free(flowa); free(flowb); return (-1); } /* switch ESP SAs to transport mode */ TAILQ_FOREACH(other, &sa->sa_childsas, csa_entry) { if (!other->csa_rekey && !other->csa_loaded && other->csa_saproto == IKEV2_SAPROTO_ESP) { other->csa_transport = 1; if (other->csa_dir == IPSP_DIRECTION_OUT) { other->csa_parent = csa; csa->csa_children++; } else { other->csa_parent = csb; csb->csa_children++; } } } /* install IPCOMP SAs */ csa->csa_ikesa = sa; csa->csa_saproto = IKEV2_SAPROTO_IPCOMP; csa->csa_spi.spi_size = 2; csa->csa_spi.spi = sa->sa_cpi_out; csa->csa_peerspi = sa->sa_cpi_in; csa->csa_dir = IPSP_DIRECTION_OUT; csa->csa_local = &sa->sa_local; csa->csa_peer = &sa->sa_peer; memcpy(csb, csa, sizeof(*csb)); csb->csa_spi.spi = csa->csa_peerspi; csb->csa_peerspi = csa->csa_spi.spi; csb->csa_dir = IPSP_DIRECTION_IN; csb->csa_local = csa->csa_peer; csb->csa_peer = csa->csa_local; csb->csa_allocated = 1; /* remove old replaced IPCOMP SAs */ TAILQ_FOREACH_SAFE(other, &sa->sa_childsas, csa_entry, nother) { if (other->csa_saproto != IKEV2_SAPROTO_IPCOMP || other->csa_children != 0) continue; if (other->csa_dir == csa->csa_dir && IKED_ADDR_EQ(other->csa_local, csa->csa_local) && IKED_ADDR_EQ(other->csa_peer, csa->csa_peer)) { log_debug("%s: csa %p replaces %p", __func__, csa, other); ikev2_ipcomp_csa_free(env, other); } else if (other->csa_dir == csb->csa_dir && IKED_ADDR_EQ(other->csa_local, csb->csa_local) && IKED_ADDR_EQ(other->csa_peer, csb->csa_peer)) { log_debug("%s: csa %p replaces %p", __func__, csb, other); ikev2_ipcomp_csa_free(env, other); } } TAILQ_INSERT_TAIL(&sa->sa_childsas, csa, csa_entry); TAILQ_INSERT_TAIL(&sa->sa_childsas, csb, csa_entry); csa->csa_peersa = csb; csb->csa_peersa = csa; /* redirect flows to IPCOMP */ /* XXX expensive? should be merged into ikev2_childsa_negotiate() */ TAILQ_FOREACH_SAFE(flow, &sa->sa_flows, flow_entry, nflow) { if (flow->flow_loaded || flow->flow_saproto != IKEV2_SAPROTO_ESP) continue; TAILQ_FOREACH(oflow, &sa->sa_flows, flow_entry) if (IKED_ADDR_EQ(&oflow->flow_src, &flow->flow_src) && IKED_ADDR_EQ(&oflow->flow_dst, &flow->flow_dst) && oflow->flow_dir == flow->flow_dir && oflow->flow_saproto == IKEV2_SAPROTO_IPCOMP) break; if (oflow != NULL) { log_debug("%s: keeping oflow %p, indentical to flow %p", __func__, oflow, flow); TAILQ_REMOVE(&sa->sa_flows, flow, flow_entry); flow_free(flow); } else { log_debug("%s: flow %p saproto %d -> %d", __func__, flow, flow->flow_saproto, IKEV2_SAPROTO_IPCOMP); flow->flow_saproto = IKEV2_SAPROTO_IPCOMP; } } /* setup ESP flows for gateways */ flowa->flow_dir = IPSP_DIRECTION_OUT; flowa->flow_saproto = IKEV2_SAPROTO_ESP; flowa->flow_local = &sa->sa_local; flowa->flow_peer = &sa->sa_peer; memcpy(&flowa->flow_src, &sa->sa_local, sizeof(sa->sa_local)); memcpy(&flowa->flow_dst, &sa->sa_peer, sizeof(sa->sa_peer)); socket_setport((struct sockaddr *)&flowa->flow_src.addr, 0); socket_setport((struct sockaddr *)&flowa->flow_dst.addr, 0); flowa->flow_src.addr_port = flowa->flow_dst.addr_port = 0; flowa->flow_src.addr_mask = flowa->flow_dst.addr_mask = (sa->sa_local.addr_af == AF_INET) ? 32 : 128; flowa->flow_ikesa = sa; /* skip if flow already exists */ TAILQ_FOREACH(flow, &sa->sa_flows, flow_entry) { if (IKED_ADDR_EQ(&flow->flow_src, &flowa->flow_src) && IKED_ADDR_EQ(&flow->flow_dst, &flowa->flow_dst) && flow->flow_dir == flowa->flow_dir && flow->flow_saproto == flowa->flow_saproto) { free(flowa); free(flowb); goto done; } } memcpy(flowb, flowa, sizeof(*flowb)); flowb->flow_dir = IPSP_DIRECTION_IN; memcpy(&flowb->flow_dst, &flowa->flow_src, sizeof(flowa->flow_src)); memcpy(&flowb->flow_src, &flowa->flow_dst, sizeof(flowa->flow_dst)); TAILQ_INSERT_TAIL(&sa->sa_flows, flowa, flow_entry); TAILQ_INSERT_TAIL(&sa->sa_flows, flowb, flow_entry); done: /* make sure IPCOMP CPIs are not reused */ sa->sa_ipcomp = 0; sa->sa_cpi_in = sa->sa_cpi_out = 0; return (0); } int ikev2_childsa_enable(struct iked *env, struct iked_sa *sa) { struct iked_childsa *csa; struct iked_flow *flow, *oflow; if (sa->sa_ipcomp && sa->sa_cpi_in && sa->sa_cpi_out && ikev2_ipcomp_enable(env, sa) == -1) return (-1); TAILQ_FOREACH(csa, &sa->sa_childsas, csa_entry) { if (csa->csa_rekey || csa->csa_loaded) continue; if (pfkey_sa_add(env->sc_pfkey, csa, NULL) != 0) { log_debug("%s: failed to load CHILD SA spi %s", __func__, print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size)); return (-1); } RB_INSERT(iked_activesas, &env->sc_activesas, csa); log_debug("%s: loaded CHILD SA spi %s", __func__, print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size)); } TAILQ_FOREACH(flow, &sa->sa_flows, flow_entry) { if (flow->flow_loaded) continue; if (pfkey_flow_add(env->sc_pfkey, flow) != 0) { log_debug("%s: failed to load flow", __func__); return (-1); } if ((oflow = RB_FIND(iked_flows, &env->sc_activeflows, flow)) != NULL) { log_debug("%s: replaced old flow %p with %p", __func__, oflow, flow); oflow->flow_loaded = 0; RB_REMOVE(iked_flows, &env->sc_activeflows, oflow); } RB_INSERT(iked_flows, &env->sc_activeflows, flow); log_debug("%s: loaded flow %p", __func__, flow); } return (0); } int ikev2_childsa_delete(struct iked *env, struct iked_sa *sa, u_int8_t saproto, u_int64_t spi, u_int64_t *spiptr, int cleanup) { struct iked_childsa *csa, *nextcsa = NULL; u_int64_t peerspi = 0; int found = 0; for (csa = TAILQ_FIRST(&sa->sa_childsas); csa != NULL; csa = nextcsa) { nextcsa = TAILQ_NEXT(csa, csa_entry); if ((saproto && csa->csa_saproto != saproto) || (spi && (csa->csa_spi.spi != spi && csa->csa_peerspi != spi)) || (cleanup && csa->csa_loaded)) continue; if (csa->csa_loaded) RB_REMOVE(iked_activesas, &env->sc_activesas, csa); if (pfkey_sa_delete(env->sc_pfkey, csa) != 0) log_debug("%s: failed to delete CHILD SA spi %s", __func__, print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size)); else log_debug("%s: deleted CHILD SA spi %s", __func__, print_spi(csa->csa_spi.spi, csa->csa_spi.spi_size)); found++; if (spi && csa->csa_spi.spi == spi) peerspi = csa->csa_peerspi; TAILQ_REMOVE(&sa->sa_childsas, csa, csa_entry); childsa_free(csa); } if (spiptr) *spiptr = peerspi; return (found ? 0 : -1); } int ikev2_valid_proposal(struct iked_proposal *prop, struct iked_transform **exf, struct iked_transform **ixf, int *esn) { struct iked_transform *xform, *encrxf, *integrxf; u_int i, doesn = 0; switch (prop->prop_protoid) { case IKEV2_SAPROTO_ESP: case IKEV2_SAPROTO_AH: break; default: return (-1); } encrxf = integrxf = NULL; for (i = 0; i < prop->prop_nxforms; i++) { xform = prop->prop_xforms + i; if (xform->xform_type == IKEV2_XFORMTYPE_ENCR) encrxf = xform; else if (xform->xform_type == IKEV2_XFORMTYPE_INTEGR) integrxf = xform; else if (xform->xform_type == IKEV2_XFORMTYPE_ESN && xform->xform_id == IKEV2_XFORMESN_ESN) doesn = 1; } if (prop->prop_protoid == IKEV2_SAPROTO_IKE) { if (encrxf == NULL || integrxf == NULL) return (-1); } else if (prop->prop_protoid == IKEV2_SAPROTO_AH) { if (integrxf == NULL) return (-1); } else if (prop->prop_protoid == IKEV2_SAPROTO_ESP) { if (encrxf == NULL) return (-1); } if (exf) *exf = encrxf; if (ixf) *ixf = integrxf; if (esn) *esn = doesn; return (0); } /* return 0 if processed, -1 if busy */ int ikev2_acquire_sa(struct iked *env, struct iked_flow *acquire) { struct iked_flow *flow; struct iked_sa *sa; struct iked_policy pol, *p = NULL; if (env->sc_passive) return (0); /* First try to find an active flow with IKE SA */ flow = RB_FIND(iked_flows, &env->sc_activeflows, acquire); if (!flow) { /* Otherwise try to find a matching policy */ bzero(&pol, sizeof(pol)); pol.pol_af = acquire->flow_peer->addr_af; memcpy(&pol.pol_peer, acquire->flow_peer, sizeof(pol.pol_peer)); RB_INIT(&pol.pol_flows); RB_INSERT(iked_flows, &pol.pol_flows, acquire); pol.pol_nflows = 1; if ((p = policy_test(env, &pol)) == NULL) { log_warnx("%s: flow wasn't found", __func__); return (0); } log_debug("%s: found matching policy '%s'", __func__, p->pol_name); if (ikev2_init_ike_sa_peer(env, p, acquire->flow_peer) != 0) log_warnx("%s: failed to initiate a " "IKE_SA_INIT exchange", __func__); } else { log_debug("%s: found active flow", __func__); if ((sa = flow->flow_ikesa) == NULL) { log_warnx("%s: flow without SA", __func__); return (0); } if (sa->sa_stateflags & IKED_REQ_CHILDSA) return (-1); /* busy, retry later */ if (ikev2_send_create_child_sa(env, sa, NULL, flow->flow_saproto) != 0) log_warnx("%s: failed to initiate a " "CREATE_CHILD_SA exchange", __func__); } return (0); } void ikev2_disable_rekeying(struct iked *env, struct iked_sa *sa) { struct iked_childsa *csa; TAILQ_FOREACH(csa, &sa->sa_childsas, csa_entry) { csa->csa_persistent = 1; csa->csa_rekey = 0; } (void)ikev2_childsa_delete(env, sa, 0, 0, NULL, 1); } /* return 0 if processed, -1 if busy */ int ikev2_rekey_sa(struct iked *env, struct iked_spi *rekey) { struct iked_childsa *csa, key; struct iked_sa *sa; key.csa_spi = *rekey; csa = RB_FIND(iked_activesas, &env->sc_activesas, &key); if (!csa) return (0); if (csa->csa_rekey) /* See if it's already taken care of */ return (0); if (csa->csa_saproto == IKEV2_SAPROTO_IPCOMP) /* no rekey */ return (0); if ((sa = csa->csa_ikesa) == NULL) { log_warnx("%s: SA %s doesn't have a parent SA", __func__, print_spi(rekey->spi, rekey->spi_size)); return (0); } if (!sa_stateok(sa, IKEV2_STATE_ESTABLISHED)) { log_warnx("%s: SA %s is not established", __func__, print_spi(rekey->spi, rekey->spi_size)); return (0); } if (sa->sa_stateflags & IKED_REQ_CHILDSA) return (-1); /* busy, retry later */ if (csa->csa_allocated) /* Peer SPI died first, get the local one */ rekey->spi = csa->csa_peerspi; if (ikev2_send_create_child_sa(env, sa, rekey, rekey->spi_protoid)) log_warnx("%s: failed to initiate a CREATE_CHILD_SA exchange", __func__); return (0); } /* return 0 if processed, -1 if busy */ int ikev2_drop_sa(struct iked *env, struct iked_spi *drop) { struct ibuf *buf = NULL; struct iked_childsa *csa, key; struct iked_sa *sa; struct ikev2_delete *del; u_int32_t spi32; key.csa_spi = *drop; csa = RB_FIND(iked_activesas, &env->sc_activesas, &key); if (!csa || csa->csa_rekey) return (0); sa = csa->csa_ikesa; if (sa && (sa->sa_stateflags & IKED_REQ_CHILDSA)) return (-1); /* busy, retry later */ RB_REMOVE(iked_activesas, &env->sc_activesas, csa); csa->csa_loaded = 0; csa->csa_rekey = 1; /* prevent re-loading */ if (sa == NULL) { log_debug("%s: failed to find a parent SA", __func__); return (0); } if (csa->csa_saproto == IKEV2_SAPROTO_IPCOMP) { /* matching Child SAs (e.g. ESP) should have expired by now */ if (csa->csa_children == 0) ikev2_ipcomp_csa_free(env, csa); return (0); } if (csa->csa_allocated) spi32 = htobe32(csa->csa_spi.spi); else spi32 = htobe32(csa->csa_peerspi); if (ikev2_childsa_delete(env, sa, csa->csa_saproto, csa->csa_peerspi, NULL, 0)) log_debug("%s: failed to delete CHILD SA %s", __func__, print_spi(csa->csa_peerspi, drop->spi_size)); /* Send PAYLOAD_DELETE */ if ((buf = ibuf_static()) == NULL) return (0); if ((del = ibuf_advance(buf, sizeof(*del))) == NULL) goto done; del->del_protoid = drop->spi_protoid; del->del_spisize = 4; del->del_nspi = htobe16(1); if (ibuf_add(buf, &spi32, sizeof(spi32))) goto done; if (ikev2_send_ike_e(env, sa, buf, IKEV2_PAYLOAD_DELETE, IKEV2_EXCHANGE_INFORMATIONAL, 0) == -1) goto done; sa->sa_stateflags |= IKED_REQ_INF; /* Initiate Child SA creation */ if (ikev2_send_create_child_sa(env, sa, NULL, drop->spi_protoid)) log_warnx("%s: failed to initiate a CREATE_CHILD_SA exchange", __func__); done: ibuf_release(buf); return (0); } int ikev2_print_id(struct iked_id *id, char *idstr, size_t idstrlen) { u_int8_t buf[BUFSIZ], *ptr; struct sockaddr_in *s4; struct sockaddr_in6 *s6; char *str; ssize_t len; int i; const char *type; bzero(buf, sizeof(buf)); bzero(idstr, idstrlen); if (id->id_buf == NULL) return (-1); len = ibuf_size(id->id_buf); ptr = ibuf_data(id->id_buf); if (len <= id->id_offset) return (-1); len -= id->id_offset; ptr += id->id_offset; type = print_map(id->id_type, ikev2_id_map); if (strlcpy(idstr, type, idstrlen) >= idstrlen || strlcat(idstr, "/", idstrlen) >= idstrlen) return (-1); idstr += strlen(idstr); idstrlen -= strlen(idstr); switch (id->id_type) { case IKEV2_ID_IPV4: s4 = (struct sockaddr_in *)buf; s4->sin_family = AF_INET; s4->sin_len = sizeof(*s4); memcpy(&s4->sin_addr.s_addr, ptr, len); if (print_host((struct sockaddr *)s4, idstr, idstrlen) == NULL) return (-1); break; case IKEV2_ID_FQDN: case IKEV2_ID_UFQDN: if (len >= (ssize_t)sizeof(buf)) return (-1); if ((str = get_string(ptr, len)) == NULL) return (-1); if (strlcpy(idstr, str, idstrlen) >= idstrlen) { free(str); return (-1); } free(str); break; case IKEV2_ID_IPV6: s6 = (struct sockaddr_in6 *)buf; s6->sin6_family = AF_INET6; s6->sin6_len = sizeof(*s6); memcpy(&s6->sin6_addr, ptr, len); if (print_host((struct sockaddr *)s6, idstr, idstrlen) == NULL) return (-1); break; case IKEV2_ID_ASN1_DN: if ((str = ca_asn1_name(ptr, len)) == NULL) return (-1); if (strlcpy(idstr, str, idstrlen) >= idstrlen) { free(str); return (-1); } free(str); break; default: /* XXX test */ for (i = 0; i < ((ssize_t)idstrlen - 1) && i < len; i++) snprintf(idstr + i, idstrlen - i, "%02x", ptr[i]); break; } return (0); } /* * If we have an IKEV2_CP_REQUEST for IKEV2_CFG_INTERNAL_IP4_ADDRESS and * if a network(pool) is configured, then select an address from that pool * and remember it in the sa_addrpool attribute. */ int ikev2_cp_setaddr(struct iked *env, struct iked_sa *sa) { struct iked_cfg *ikecfg = NULL; struct iked_policy *pol = sa->sa_policy; struct sockaddr_in *in4 = NULL, *cfg4 = NULL; struct sockaddr_in6 *in6 = NULL, *cfg6 = NULL; struct iked_sa key; struct iked_addr addr; u_int32_t mask, host, lower, upper, start; size_t i; if (sa->sa_addrpool || pol->pol_ncfg == 0) return (0); /* check for an address pool config (address w/ prefixlen != 32) */ bzero(&addr, sizeof(addr)); for (i = 0; i < pol->pol_ncfg; i++) { ikecfg = &pol->pol_cfg[i]; if (ikecfg->cfg_type == IKEV2_CFG_INTERNAL_IP4_ADDRESS && ikecfg->cfg.address.addr_mask != 32) { addr.addr_af = AF_INET; break; } if (ikecfg->cfg_type == IKEV2_CFG_INTERNAL_IP6_ADDRESS && ikecfg->cfg.address.addr_mask != 128) { addr.addr_af = AF_INET6; break; } } if (i == pol->pol_ncfg) return (0); /* * failure: pool configured, but not requested. * If we continue, we might end up with flows where 0.0.0.0 is NOT * replaced with an address from the pool with ikev2_cp_fixaddr(). */ if (sa->sa_cp != IKEV2_CP_REQUEST) { log_debug("%s: pool configured, but IKEV2_CP_REQUEST missing", __func__); return (-1); } /* truncate prefixlen in the v6 case */ mask = prefixlen2mask(ikecfg->cfg.address.addr_mask); switch (addr.addr_af) { case AF_INET: cfg4 = (struct sockaddr_in *)&ikecfg->cfg.address.addr; in4 = (struct sockaddr_in *)&addr.addr; in4->sin_family = AF_INET; in4->sin_len = sizeof(*in4); lower = ntohl(cfg4->sin_addr.s_addr & ~mask); break; case AF_INET6: cfg6 = (struct sockaddr_in6 *)&ikecfg->cfg.address.addr; in6 = (struct sockaddr_in6 *)&addr.addr; in6->sin6_family = AF_INET6; in6->sin6_len = sizeof(*in6); lower = cfg6->sin6_addr.s6_addr[3]; break; default: return (-1); } if (lower == 0) lower = 1; /* Note that start, upper and host are in HOST byte order */ upper = ntohl(~mask); /* Randomly select start from [lower, upper-1] */ start = arc4random_uniform(upper - lower) + lower; key.sa_addrpool = &addr; for (host = start;;) { log_debug("%s: mask %x start %x lower %x host %x upper %x", __func__, mask, start, lower, host, upper); switch (addr.addr_af) { case AF_INET: in4->sin_addr.s_addr = (cfg4->sin_addr.s_addr & mask) | htonl(host); break; case AF_INET6: memcpy(in6, cfg6, sizeof(*in6)); in6->sin6_addr.s6_addr[3] = htonl(host); break; } if (!RB_FIND(iked_addrpool, &env->sc_addrpool, &key)) break; /* try next address */ host++; /* but skip broadcast and network address */ if (host >= upper || host < lower) host = lower; if (host == start) return (-1); /* exhausted */ } if (!key.sa_addrpool) return (-1); /* cannot happen? */ if ((sa->sa_addrpool = calloc(1, sizeof(addr))) == NULL) return (-1); memcpy(sa->sa_addrpool, &addr, sizeof(addr)); RB_INSERT(iked_addrpool, &env->sc_addrpool, sa); return (0); } /* * if 'addr' is 'UNSPECIFIED' replace it with sa_addrpool from * the ip-pool and store the result in 'patched'. */ int ikev2_cp_fixaddr(struct iked_sa *sa, struct iked_addr *addr, struct iked_addr *patched) { struct sockaddr_in *in4; struct sockaddr_in6 *in6; if (sa->sa_addrpool == NULL || sa->sa_addrpool->addr_af != addr->addr_af) return (-1); switch (addr->addr_af) { case AF_INET: in4 = (struct sockaddr_in *)&addr->addr; if (in4->sin_addr.s_addr) return (-1); break; case AF_INET6: in6 = (struct sockaddr_in6 *)&addr->addr; if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) return (-1); break; } memcpy(patched, sa->sa_addrpool, sizeof(*patched)); return (0); }