/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include static int ikev2_delete_tunnel_interface(vnet_main_t * vnm, ikev2_sa_t *sa, ikev2_child_sa_t * child); static void hexdump(u8 buffer[], int len) { #define HEXDUMP_LINE_LEN 16 int i; char s[HEXDUMP_LINE_LEN+1]; bzero(s, HEXDUMP_LINE_LEN+1); for(i=0; i < len; i++) { if (!(i%HEXDUMP_LINE_LEN)) { if (s[0]) printf("[%s]",s); printf("\n%05x: ", i); bzero(s, HEXDUMP_LINE_LEN); } s[i%HEXDUMP_LINE_LEN]=isprint(buffer[i])?buffer[i]:'.'; printf("%02x ", buffer[i]); } while(i++%HEXDUMP_LINE_LEN) printf(" "); printf("[%s]\n", s); } #define ikev2_set_state(sa, v) do { \ (sa)->state = v; \ clib_warning("sa state changed to " #v); \ } while(0); typedef struct { u32 next_index; u32 sw_if_index; } ikev2_trace_t; static u8 * format_ikev2_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); ikev2_trace_t * t = va_arg (*args, ikev2_trace_t *); s = format (s, "ikev2: sw_if_index %d, next index %d", t->sw_if_index, t->next_index); return s; } vlib_node_registration_t ikev2_node; #define foreach_ikev2_error \ _(PROCESSED, "IKEv2 packets processed") \ _(IKE_SA_INIT_RETRANSMIT, "IKE_SA_INIT retransmit ") \ _(IKE_SA_INIT_IGNORE, "IKE_SA_INIT ignore (IKE SA already auth)") \ _(IKE_REQ_RETRANSMIT, "IKE request retransmit") \ _(IKE_REQ_IGNORE, "IKE request ignore (old msgid)") \ _(NOT_IKEV2, "Non IKEv2 packets received") typedef enum { #define _(sym,str) IKEV2_ERROR_##sym, foreach_ikev2_error #undef _ IKEV2_N_ERROR, } ikev2_error_t; static char * ikev2_error_strings[] = { #define _(sym,string) string, foreach_ikev2_error #undef _ }; typedef enum { IKEV2_NEXT_IP4_LOOKUP, IKEV2_NEXT_ERROR_DROP, IKEV2_N_NEXT, } ikev2_next_t; static ikev2_sa_transform_t * ikev2_find_transform_data(ikev2_sa_transform_t * t) { ikev2_main_t * km = &ikev2_main; ikev2_sa_transform_t * td; vec_foreach(td, km->supported_transforms) { if (td->type != t->type) continue; if (td->transform_id != t->transform_id) continue; if (td->type == IKEV2_TRANSFORM_TYPE_ENCR) { if (vec_len(t->attrs) != 4 || t->attrs[0] != 0x80 || t->attrs[1] != 14) continue; if (((t->attrs[2] << 8 | t->attrs[3]) / 8) != td->key_len) continue; } return td; } return 0; } static ikev2_sa_proposal_t * ikev2_select_proposal(ikev2_sa_proposal_t *proposals, ikev2_protocol_id_t prot_id) { ikev2_sa_proposal_t * rv = 0; ikev2_sa_proposal_t * proposal; ikev2_sa_transform_t * transform, * new_t; u8 mandatory_bitmap, optional_bitmap; if (prot_id == IKEV2_PROTOCOL_IKE) { mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_ENCR) | (1 << IKEV2_TRANSFORM_TYPE_PRF) | (1 << IKEV2_TRANSFORM_TYPE_INTEG) | (1 << IKEV2_TRANSFORM_TYPE_DH); optional_bitmap = mandatory_bitmap; } else if (prot_id == IKEV2_PROTOCOL_ESP) { mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_ENCR) | (1 << IKEV2_TRANSFORM_TYPE_ESN); optional_bitmap = mandatory_bitmap | (1 << IKEV2_TRANSFORM_TYPE_INTEG) | (1 << IKEV2_TRANSFORM_TYPE_DH); } else if (prot_id == IKEV2_PROTOCOL_AH) { mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_INTEG) | (1 << IKEV2_TRANSFORM_TYPE_ESN); optional_bitmap = mandatory_bitmap | (1 << IKEV2_TRANSFORM_TYPE_DH); } else return 0; vec_add2(rv, proposal, 1); vec_foreach(proposal, proposals) { u8 bitmap = 0; if (proposal->protocol_id != prot_id) continue; vec_foreach(transform, proposal->transforms) { if ((1 << transform->type) & bitmap) continue; if (ikev2_find_transform_data(transform)) { bitmap |= 1 << transform->type; vec_add2(rv->transforms, new_t, 1); memcpy(new_t, transform, sizeof(*new_t)); new_t->attrs = vec_dup(transform->attrs); } } clib_warning("bitmap is %x mandatory is %x optional is %x", bitmap, mandatory_bitmap, optional_bitmap); if ((bitmap & mandatory_bitmap) == mandatory_bitmap && (bitmap & ~optional_bitmap) == 0) { rv->proposal_num = proposal->proposal_num; rv->protocol_id = proposal->protocol_id; RAND_bytes((u8 *) &rv->spi, sizeof(rv->spi)); goto done; } else { vec_free(rv->transforms); } } vec_free(rv); done: return rv; } ikev2_sa_transform_t * ikev2_sa_get_td_for_type(ikev2_sa_proposal_t * p, ikev2_transform_type_t type) { ikev2_sa_transform_t * t; if (!p) return 0; vec_foreach(t, p->transforms) { if (t->type == type) return ikev2_find_transform_data(t); } return 0; } ikev2_child_sa_t * ikev2_sa_get_child(ikev2_sa_t * sa, u32 spi, ikev2_protocol_id_t prot_id) { ikev2_child_sa_t * c; vec_foreach(c, sa->childs) { if (c->i_proposals[0].spi == spi && c->i_proposals[0].protocol_id == prot_id) return c; } return 0; } void ikev2_sa_free_proposal_vector(ikev2_sa_proposal_t ** v) { ikev2_sa_proposal_t * p; ikev2_sa_transform_t * t; if (!*v) return; vec_foreach(p, *v) { vec_foreach(t, p->transforms) { vec_free(t->attrs); } vec_free(p->transforms); } vec_free(*v); }; static void ikev2_sa_free_all_child_sa(ikev2_child_sa_t ** childs) { ikev2_child_sa_t * c; vec_foreach(c, *childs) { ikev2_sa_free_proposal_vector(&c->r_proposals); ikev2_sa_free_proposal_vector(&c->i_proposals); vec_free(c->sk_ai); vec_free(c->sk_ar); vec_free(c->sk_ei); vec_free(c->sk_er); } vec_free(*childs); } static void ikev2_sa_del_child_sa(ikev2_sa_t * sa, ikev2_child_sa_t * child) { ikev2_sa_free_proposal_vector(&child->r_proposals); ikev2_sa_free_proposal_vector(&child->i_proposals); vec_free(child->sk_ai); vec_free(child->sk_ar); vec_free(child->sk_ei); vec_free(child->sk_er); vec_del1(sa->childs, child - sa->childs); } static void ikev2_sa_free_all_vec(ikev2_sa_t *sa) { vec_free(sa->i_nonce); vec_free(sa->i_dh_data); vec_free(sa->dh_shared_key); ikev2_sa_free_proposal_vector(&sa->r_proposals); ikev2_sa_free_proposal_vector(&sa->i_proposals); vec_free(sa->sk_d); vec_free(sa->sk_ai); vec_free(sa->sk_ar); vec_free(sa->sk_ei); vec_free(sa->sk_er); vec_free(sa->sk_pi); vec_free(sa->sk_pr); vec_free(sa->i_id.data); vec_free(sa->i_auth.data); vec_free(sa->r_id.data); vec_free(sa->r_auth.data); if (sa->r_auth.key) EVP_PKEY_free(sa->r_auth.key); vec_free(sa->del); ikev2_sa_free_all_child_sa(&sa->childs); } static void ikev2_delete_sa(ikev2_sa_t *sa) { ikev2_main_t * km = &ikev2_main; uword * p; ikev2_sa_free_all_vec(sa); p = hash_get(km->sa_by_rspi, sa->rspi); if (p) { hash_unset(km->sa_by_rspi, sa->rspi); pool_put(km->sas, sa); } } static void ikev2_generate_sa_init_data(ikev2_sa_t *sa) { ikev2_sa_transform_t * t = 0, * t2; ikev2_main_t * km = &ikev2_main; if (sa->dh_group == IKEV2_TRANSFORM_DH_TYPE_NONE) { return; } /* check if received DH group is on our list of supported groups */ vec_foreach(t2, km->supported_transforms) { if (t2->type == IKEV2_TRANSFORM_TYPE_DH && sa->dh_group == t2->dh_type) { t = t2; break; } } if (!t) { clib_warning("unknown dh data group %u (data len %u)", sa->dh_group, vec_len(sa->i_dh_data)); sa->dh_group = IKEV2_TRANSFORM_DH_TYPE_NONE; return; } /* generate rspi */ RAND_bytes((u8 *) &sa->rspi, 8); /* generate nonce */ sa->r_nonce = vec_new(u8, IKEV2_NONCE_SIZE); RAND_bytes((u8 *) sa->r_nonce, IKEV2_NONCE_SIZE); /* generate dh keys */ ikev2_generate_dh(sa, t); } static void ikev2_calc_keys(ikev2_sa_t *sa) { u8 * tmp; /* calculate SKEYSEED = prf(Ni | Nr, g^ir) */ u8 * skeyseed = 0; u8 * s = 0; ikev2_sa_transform_t * tr_encr, * tr_prf, * tr_integ; tr_encr = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR); tr_prf = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF); tr_integ = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG); vec_append(s, sa->i_nonce); vec_append(s, sa->r_nonce); skeyseed = ikev2_calc_prf(tr_prf, s, sa->dh_shared_key); /* Calculate S = Ni | Nr | SPIi | SPIr*/ u64 * spi; vec_add2(s, tmp, 2 * sizeof(*spi)); spi = (u64 *) tmp; spi[0] = clib_host_to_net_u64(sa->ispi); spi[1] = clib_host_to_net_u64(sa->rspi); /* calculate PRFplus */ u8 * keymat; int len = tr_prf->key_trunc + /* SK_d */ tr_integ->key_len * 2 + /* SK_ai, SK_ar */ tr_encr->key_len * 2 + /* SK_ei, SK_er */ tr_prf->key_len * 2 ; /* SK_pi, SK_pr */ keymat = ikev2_calc_prfplus(tr_prf, skeyseed, s, len); vec_free(skeyseed); vec_free(s); int pos = 0; /* SK_d */ sa->sk_d = vec_new(u8, tr_prf->key_trunc); memcpy(sa->sk_d, keymat + pos, tr_prf->key_trunc); pos += tr_prf->key_trunc; /* SK_ai */ sa->sk_ai = vec_new(u8, tr_integ->key_len); memcpy(sa->sk_ai, keymat + pos, tr_integ->key_len); pos += tr_integ->key_len; /* SK_ar */ sa->sk_ar = vec_new(u8, tr_integ->key_len); memcpy(sa->sk_ar, keymat + pos, tr_integ->key_len); pos += tr_integ->key_len; /* SK_ei */ sa->sk_ei = vec_new(u8, tr_encr->key_len); memcpy(sa->sk_ei, keymat + pos, tr_encr->key_len); pos += tr_encr->key_len; /* SK_er */ sa->sk_er = vec_new(u8, tr_encr->key_len); memcpy(sa->sk_er, keymat + pos, tr_encr->key_len); pos += tr_encr->key_len; /* SK_pi */ sa->sk_pi = vec_new(u8, tr_prf->key_len); memcpy(sa->sk_pi, keymat + pos, tr_prf->key_len); pos += tr_prf->key_len; /* SK_pr */ sa->sk_pr = vec_new(u8, tr_prf->key_len); memcpy(sa->sk_pr, keymat + pos, tr_prf->key_len); pos += tr_prf->key_len; vec_free(keymat); } static void ikev2_calc_child_keys(ikev2_sa_t *sa, ikev2_child_sa_t * child) { u8 * s = 0; ikev2_sa_transform_t * tr_prf, * ctr_encr, * ctr_integ; tr_prf = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF); ctr_encr = ikev2_sa_get_td_for_type(child->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR); ctr_integ = ikev2_sa_get_td_for_type(child->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG); vec_append(s, sa->i_nonce); vec_append(s, sa->r_nonce); /* calculate PRFplus */ u8 * keymat; int len = ctr_encr->key_len * 2 + ctr_integ->key_len * 2; keymat = ikev2_calc_prfplus(tr_prf, sa->sk_d, s, len); hexdump(keymat, vec_len(keymat)); int pos = 0; /* SK_ei */ child->sk_ei = vec_new(u8, ctr_encr->key_len); memcpy(child->sk_ei, keymat + pos, ctr_encr->key_len); pos += ctr_encr->key_len; /* SK_ai */ child->sk_ai = vec_new(u8, ctr_integ->key_len); memcpy(child->sk_ai, keymat + pos, ctr_integ->key_len); pos += ctr_integ->key_len; /* SK_er */ child->sk_er = vec_new(u8, ctr_encr->key_len); memcpy(child->sk_er, keymat + pos, ctr_encr->key_len); pos += ctr_encr->key_len; /* SK_ar */ child->sk_ar = vec_new(u8, ctr_integ->key_len); memcpy(child->sk_ar, keymat + pos, ctr_integ->key_len); pos += ctr_integ->key_len; ASSERT(pos == len); vec_free(keymat); } static void ikev2_process_sa_init_req(vlib_main_t * vm, ikev2_sa_t *sa, ike_header_t * ike) { int p = 0; u32 len = clib_net_to_host_u32(ike->length); u8 payload = ike->nextpayload; clib_warning("ispi %lx rspi %lx nextpayload %x version %x " "exchange %x flags %x msgid %x length %u", clib_net_to_host_u64(ike->ispi), clib_net_to_host_u64(ike->rspi), payload, ike->version, ike->exchange, ike->flags, clib_net_to_host_u32(ike->msgid), len); sa->ispi = clib_net_to_host_u64(ike->ispi); /* store whole IKE payload - needed for PSK auth */ vec_free(sa->last_sa_init_req_packet_data); vec_add(sa->last_sa_init_req_packet_data, ike, len); while (p < len && payload!= IKEV2_PAYLOAD_NONE) { ike_payload_header_t * ikep = (ike_payload_header_t *) &ike->payload[p]; u32 plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(ike_payload_header_t)) return; if (payload == IKEV2_PAYLOAD_SA) { ikev2_sa_free_proposal_vector(&sa->i_proposals); sa->i_proposals = ikev2_parse_sa_payload(ikep); } else if (payload == IKEV2_PAYLOAD_KE) { ike_ke_payload_header_t * ke = (ike_ke_payload_header_t *) ikep; sa->dh_group = clib_net_to_host_u16(ke->dh_group); vec_free(sa->i_dh_data); vec_add(sa->i_dh_data, ke->payload, plen - sizeof(*ke)); } else if (payload == IKEV2_PAYLOAD_NONCE) { vec_free(sa->i_nonce); vec_add(sa->i_nonce, ikep->payload, plen - sizeof(*ikep)); } else if (payload == IKEV2_PAYLOAD_NOTIFY) { ikev2_notify_t * n = ikev2_parse_notify_payload(ikep); vec_free(n); } else if (payload == IKEV2_PAYLOAD_VENDOR) { ikev2_parse_vendor_payload(ikep); } else { clib_warning("unknown payload %u flags %x length %u", payload, ikep->flags, plen); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); sa->unsupported_cp = payload; return; } } payload = ikep->nextpayload; p+=plen; } ikev2_set_state(sa, IKEV2_STATE_SA_INIT); } static u8 * ikev2_decrypt_sk_payload(ikev2_sa_t * sa, ike_header_t * ike, u8 * payload) { int p = 0; u8 last_payload = 0; u8 * hmac = 0; u32 len = clib_net_to_host_u32(ike->length); ike_payload_header_t * ikep; u32 plen; ikev2_sa_transform_t * tr_integ; tr_integ = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG); while (p < len && *payload != IKEV2_PAYLOAD_NONE && last_payload != IKEV2_PAYLOAD_SK) { ikep = (ike_payload_header_t *) &ike->payload[p]; plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(*ikep)) return 0; if (*payload == IKEV2_PAYLOAD_SK) { clib_warning("received IKEv2 payload SK, len %u", plen - 4); last_payload = *payload; } else { clib_warning("unknown payload %u flags %x length %u", payload, ikep->flags, plen); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { sa->unsupported_cp = *payload; return 0; } } *payload = ikep->nextpayload; p+=plen; } if (last_payload != IKEV2_PAYLOAD_SK) { clib_warning("Last payload must be SK"); return 0; } hmac = ikev2_calc_integr(tr_integ, sa->sk_ai, (u8 *) ike, len - tr_integ->key_trunc); plen = plen - sizeof(*ikep) - tr_integ->key_trunc; if (memcmp(hmac, &ikep->payload[plen], tr_integ->key_trunc)) { clib_warning("message integrity check failed"); vec_free(hmac); return 0; } vec_free(hmac); return ikev2_decrypt_data(sa, ikep->payload, plen); } static void ikev2_initial_contact_cleanup (ikev2_sa_t * sa) { ikev2_main_t * km = &ikev2_main; ikev2_sa_t * tmp; u32 i, * delete = 0; ikev2_child_sa_t * c; if (!sa->initial_contact) return; /* find old IKE SAs with the same authenticated identity */ pool_foreach (tmp, km->sas, ({ if (tmp->i_id.type != sa->i_id.type || vec_len(tmp->i_id.data) != vec_len(sa->i_id.data) || memcmp(sa->i_id.data, tmp->i_id.data, vec_len(sa->i_id.data))) continue; if (sa->rspi != tmp->rspi) vec_add1(delete, tmp - km->sas); })); for (i = 0; i < vec_len(delete); i++) { tmp = pool_elt_at_index(km->sas, delete[i]); vec_foreach(c, tmp->childs) ikev2_delete_tunnel_interface(km->vnet_main, tmp, c); ikev2_delete_sa(tmp); } vec_free(delete); sa->initial_contact = 0; } static void ikev2_process_auth_req(vlib_main_t * vm, ikev2_sa_t *sa, ike_header_t * ike) { ikev2_child_sa_t * first_child_sa; int p = 0; u32 len = clib_net_to_host_u32(ike->length); u8 payload = ike->nextpayload; u8 * plaintext = 0; ike_payload_header_t * ikep; u32 plen; clib_warning("ispi %lx rspi %lx nextpayload %x version %x " "exchange %x flags %x msgid %x length %u", clib_net_to_host_u64(ike->ispi), clib_net_to_host_u64(ike->rspi), payload, ike->version, ike->exchange, ike->flags, clib_net_to_host_u32(ike->msgid), len); ikev2_calc_keys(sa); plaintext = ikev2_decrypt_sk_payload(sa, ike, &payload); if (!plaintext) { if (sa->unsupported_cp) ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); goto cleanup_and_exit; } /* create 1st child SA */ ikev2_sa_free_all_child_sa(&sa->childs); vec_add2(sa->childs, first_child_sa, 1); /* process encrypted payload */ p = 0; while (p < vec_len(plaintext) && payload != IKEV2_PAYLOAD_NONE) { ikep = (ike_payload_header_t *) &plaintext[p]; plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(ike_payload_header_t)) goto cleanup_and_exit; if (payload == IKEV2_PAYLOAD_SA) /* 33 */ { clib_warning("received payload SA, len %u", plen - sizeof(*ikep)); ikev2_sa_free_proposal_vector(&first_child_sa->i_proposals); first_child_sa->i_proposals = ikev2_parse_sa_payload(ikep); } else if (payload == IKEV2_PAYLOAD_IDI) /* 35 */ { ike_id_payload_header_t * id = (ike_id_payload_header_t *) ikep; sa->i_id.type = id->id_type; vec_free(sa->i_id.data); vec_add(sa->i_id.data, id->payload, plen - sizeof(*id)); clib_warning("received payload IDi, len %u id_type %u", plen - sizeof(*id), id->id_type); } else if (payload == IKEV2_PAYLOAD_AUTH) /* 39 */ { ike_auth_payload_header_t * a = (ike_auth_payload_header_t *) ikep; sa->i_auth.method = a->auth_method; vec_free(sa->i_auth.data); vec_add(sa->i_auth.data, a->payload, plen - sizeof(*a)); clib_warning("received payload AUTH, len %u auth_type %u", plen - sizeof(*a), a->auth_method); } else if (payload == IKEV2_PAYLOAD_NOTIFY) /* 41 */ { ikev2_notify_t * n = ikev2_parse_notify_payload(ikep); if (n->msg_type == IKEV2_NOTIFY_MSG_INITIAL_CONTACT) { sa->initial_contact = 1; } vec_free(n); } else if (payload == IKEV2_PAYLOAD_VENDOR) /* 43 */ { ikev2_parse_vendor_payload(ikep); } else if (payload == IKEV2_PAYLOAD_TSI) /* 44 */ { clib_warning("received payload TSi, len %u", plen - sizeof(*ikep)); vec_free(first_child_sa->tsi); first_child_sa->tsi = ikev2_parse_ts_payload(ikep); } else if (payload == IKEV2_PAYLOAD_TSR) /* 45 */ { clib_warning("received payload TSr, len %u", plen - sizeof(*ikep)); vec_free(first_child_sa->tsr); first_child_sa->tsr = ikev2_parse_ts_payload(ikep); } else { clib_warning("unknown payload %u flags %x length %u data %u", payload, ikep->flags, plen - 4, format_hex_bytes, ikep->payload, plen - 4); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); sa->unsupported_cp = payload; return; } } payload = ikep->nextpayload; p += plen; } cleanup_and_exit: vec_free(plaintext); } static void ikev2_process_informational_req(vlib_main_t * vm, ikev2_sa_t *sa, ike_header_t * ike) { int p = 0; u32 len = clib_net_to_host_u32(ike->length); u8 payload = ike->nextpayload; u8 * plaintext = 0; ike_payload_header_t * ikep; u32 plen; clib_warning("ispi %lx rspi %lx nextpayload %x version %x " "exchange %x flags %x msgid %x length %u", clib_net_to_host_u64(ike->ispi), clib_net_to_host_u64(ike->rspi), payload, ike->version, ike->exchange, ike->flags, clib_net_to_host_u32(ike->msgid), len); plaintext = ikev2_decrypt_sk_payload(sa, ike, &payload); if (!plaintext) goto cleanup_and_exit; /* process encrypted payload */ p = 0; while (p < vec_len(plaintext) && payload != IKEV2_PAYLOAD_NONE) { ikep = (ike_payload_header_t *) &plaintext[p]; plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(ike_payload_header_t)) goto cleanup_and_exit; if (payload == IKEV2_PAYLOAD_NOTIFY) /* 41 */ { ikev2_notify_t * n = ikev2_parse_notify_payload(ikep); if (n->msg_type == IKEV2_NOTIFY_MSG_AUTHENTICATION_FAILED) ikev2_set_state(sa, IKEV2_STATE_AUTH_FAILED); vec_free(n); } else if (payload == IKEV2_PAYLOAD_DELETE) /* 42 */ { sa->del = ikev2_parse_delete_payload(ikep); } else if (payload == IKEV2_PAYLOAD_VENDOR) /* 43 */ { ikev2_parse_vendor_payload(ikep); } else { clib_warning("unknown payload %u flags %x length %u data %u", payload, ikep->flags, plen - 4, format_hex_bytes, ikep->payload, plen - 4); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { sa->unsupported_cp = payload; return; } } payload = ikep->nextpayload; p += plen; } cleanup_and_exit: vec_free(plaintext); } static void ikev2_process_create_child_sa_req(vlib_main_t * vm, ikev2_sa_t *sa, ike_header_t * ike) { int p = 0; u32 len = clib_net_to_host_u32(ike->length); u8 payload = ike->nextpayload; u8 * plaintext = 0; u8 rekeying = 0; u8 i_nonce[IKEV2_NONCE_SIZE]; ike_payload_header_t * ikep; u32 plen; ikev2_notify_t * n = 0; ikev2_ts_t * tsi = 0; ikev2_ts_t * tsr = 0; ikev2_sa_proposal_t * proposal = 0; ikev2_child_sa_t * child_sa; clib_warning("ispi %lx rspi %lx nextpayload %x version %x " "exchange %x flags %x msgid %x length %u", clib_net_to_host_u64(ike->ispi), clib_net_to_host_u64(ike->rspi), payload, ike->version, ike->exchange, ike->flags, clib_net_to_host_u32(ike->msgid), len); plaintext = ikev2_decrypt_sk_payload(sa, ike, &payload); if (!plaintext) goto cleanup_and_exit; /* process encrypted payload */ p = 0; while (p < vec_len(plaintext) && payload != IKEV2_PAYLOAD_NONE) { ikep = (ike_payload_header_t *) &plaintext[p]; plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(ike_payload_header_t)) goto cleanup_and_exit; else if (payload == IKEV2_PAYLOAD_SA) { proposal = ikev2_parse_sa_payload(ikep); } else if (payload == IKEV2_PAYLOAD_NOTIFY) { n = ikev2_parse_notify_payload(ikep); if (n->msg_type == IKEV2_NOTIFY_MSG_REKEY_SA) { rekeying = 1; } } else if (payload == IKEV2_PAYLOAD_DELETE) { sa->del = ikev2_parse_delete_payload(ikep); } else if (payload == IKEV2_PAYLOAD_VENDOR) { ikev2_parse_vendor_payload(ikep); } else if (payload == IKEV2_PAYLOAD_NONCE) { memcpy(i_nonce, ikep->payload, plen - sizeof(*ikep)); } else if (payload == IKEV2_PAYLOAD_TSI) { tsi = ikev2_parse_ts_payload(ikep); } else if (payload == IKEV2_PAYLOAD_TSR) { tsr = ikev2_parse_ts_payload(ikep); } else { clib_warning("unknown payload %u flags %x length %u data %u", payload, ikep->flags, plen - 4, format_hex_bytes, ikep->payload, plen - 4); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { sa->unsupported_cp = payload; return; } } payload = ikep->nextpayload; p += plen; } if (rekeying) { ikev2_rekey_t * rekey; child_sa = ikev2_sa_get_child(sa, n->spi, n->protocol_id); if (!child_sa) { clib_warning("child SA spi %lx not found", n->spi); goto cleanup_and_exit; } vec_add2(sa->rekey, rekey, 1); rekey->protocol_id = n->protocol_id; rekey->spi = n->spi; rekey->i_proposal = proposal; rekey->r_proposal = ikev2_select_proposal(proposal, IKEV2_PROTOCOL_ESP); rekey->tsi = tsi; rekey->tsr = tsr; /* update Ni */ vec_free(sa->i_nonce); vec_add(sa->i_nonce, i_nonce, IKEV2_NONCE_SIZE); /* generate new Nr */ vec_free(sa->r_nonce); sa->r_nonce = vec_new(u8, IKEV2_NONCE_SIZE); RAND_bytes((u8 *) sa->r_nonce, IKEV2_NONCE_SIZE); } cleanup_and_exit: vec_free(plaintext); vec_free(n); } static u8 * ikev2_sa_generate_authmsg(ikev2_sa_t *sa, int is_responder) { u8 * authmsg = 0; u8 * data; u8 * nonce; ikev2_id_t * id; u8 * key; u8 * packet_data; ikev2_sa_transform_t * tr_prf; tr_prf = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF); if (is_responder) { id = &sa->r_id; key = sa->sk_pr; nonce = sa->i_nonce; packet_data = sa->last_sa_init_res_packet_data; } else { id = &sa->i_id; key = sa->sk_pi; nonce = sa->r_nonce; packet_data = sa->last_sa_init_req_packet_data; } data = vec_new(u8, 4); data[0] = id->type; vec_append(data, id->data); u8 * id_hash = ikev2_calc_prf(tr_prf, key, data); vec_append(authmsg, packet_data); vec_append(authmsg, nonce); vec_append(authmsg, id_hash); vec_free(id_hash); vec_free(data); return authmsg; } static int ikev2_ts_cmp(ikev2_ts_t * ts1, ikev2_ts_t * ts2) { if (ts1->ts_type == ts2->ts_type && ts1->protocol_id == ts2->protocol_id && ts1->start_port == ts2->start_port && ts1->end_port == ts2->end_port && ts1->start_addr.as_u32 == ts2->start_addr.as_u32 && ts1->end_addr.as_u32 == ts2->end_addr.as_u32) return 1; return 0; } static void ikev2_sa_match_ts(ikev2_sa_t *sa) { ikev2_main_t * km = &ikev2_main; ikev2_profile_t * p; ikev2_ts_t * ts, * tsi = 0, * tsr = 0; pool_foreach (p, km->profiles, ({ /* check id */ if (p->rem_id.type != sa->i_id.type || vec_len(p->rem_id.data) != vec_len(sa->i_id.data) || memcmp(p->rem_id.data, sa->i_id.data, vec_len(p->rem_id.data))) continue; vec_foreach(ts, sa->childs[0].tsi) { if (ikev2_ts_cmp(&p->rem_ts, ts)) { tsi = vec_dup(ts); break; } } vec_foreach(ts, sa->childs[0].tsr) { if (ikev2_ts_cmp(&p->loc_ts, ts)) { tsr = vec_dup(ts); break; } } break; })); if (tsi && tsr) { vec_free(sa->childs[0].tsi); vec_free(sa->childs[0].tsr); sa->childs[0].tsi = tsi; sa->childs[0].tsr = tsr; } else { vec_free(tsi); vec_free(tsr); ikev2_set_state(sa, IKEV2_STATE_TS_UNACCEPTABLE); } } static void ikev2_sa_auth(ikev2_sa_t *sa) { ikev2_main_t * km = &ikev2_main; ikev2_profile_t * p, * sel_p = 0; u8 * authmsg, * key_pad, * psk = 0, * auth = 0; ikev2_sa_transform_t * tr_prf; tr_prf = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF); /* only shared key and rsa signature */ if (!(sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC || sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG)) { clib_warning("unsupported authentication method %u", sa->i_auth.method); ikev2_set_state(sa, IKEV2_STATE_AUTH_FAILED); return; } key_pad = format(0, "%s", IKEV2_KEY_PAD); authmsg = ikev2_sa_generate_authmsg(sa, 0); pool_foreach (p, km->profiles, ({ /* check id */ if (p->rem_id.type != sa->i_id.type || vec_len(p->rem_id.data) != vec_len(sa->i_id.data) || memcmp(p->rem_id.data, sa->i_id.data, vec_len(p->rem_id.data))) continue; if (sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC) { if (!p->auth.data || p->auth.method != IKEV2_AUTH_METHOD_SHARED_KEY_MIC) continue; psk = ikev2_calc_prf(tr_prf, p->auth.data, key_pad); auth = ikev2_calc_prf(tr_prf, psk, authmsg); if (!memcmp(auth, sa->i_auth.data, vec_len(sa->i_auth.data))) { ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED); vec_free(auth); sel_p = p; break; } } else if (sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG) { if (p->auth.method != IKEV2_AUTH_METHOD_RSA_SIG) continue; if (ikev2_verify_sign(p->auth.key, sa->i_auth.data, authmsg) == 1) { ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED); sel_p = p; break; } } vec_free(auth); vec_free(psk); })); vec_free(authmsg); if (sa->state == IKEV2_STATE_AUTHENTICATED) { vec_free(sa->r_id.data); sa->r_id.data = vec_dup(sel_p->loc_id.data); sa->r_id.type = sel_p->loc_id.type; /* generate our auth data */ authmsg = ikev2_sa_generate_authmsg(sa, 1); if (sel_p->auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC) { sa->r_auth.data = ikev2_calc_prf(tr_prf, psk, authmsg); sa->r_auth.method = IKEV2_AUTH_METHOD_SHARED_KEY_MIC; } else if (sel_p->auth.method == IKEV2_AUTH_METHOD_RSA_SIG) { sa->r_auth.data = ikev2_calc_sign(km->pkey, authmsg); sa->r_auth.method = IKEV2_AUTH_METHOD_RSA_SIG; } vec_free(authmsg); /* select transforms for 1st child sa */ ikev2_sa_free_proposal_vector(&sa->childs[0].r_proposals); sa->childs[0].r_proposals = ikev2_select_proposal(sa->childs[0].i_proposals, IKEV2_PROTOCOL_ESP); } else { ikev2_set_state(sa, IKEV2_STATE_AUTH_FAILED); } vec_free(psk); vec_free(key_pad); } static int ikev2_create_tunnel_interface(vnet_main_t * vnm, ikev2_sa_t *sa, ikev2_child_sa_t * child) { ipsec_add_del_tunnel_args_t a; ikev2_sa_transform_t * tr; u32 hw_if_index; u8 encr_type = 0; if (!child->r_proposals) { ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } a.is_add = 1; a.local_ip.as_u32 = sa->raddr.as_u32; a.remote_ip.as_u32 = sa->iaddr.as_u32; a.local_spi = child->i_proposals[0].spi; a.remote_spi = child->r_proposals[0].spi; a.anti_replay = 1; tr = ikev2_sa_get_td_for_type(child->r_proposals, IKEV2_TRANSFORM_TYPE_ESN); if (tr) a.esn = tr->esn_type; else a.esn = 0; tr = ikev2_sa_get_td_for_type(child->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR); if (tr) { if (tr->encr_type == IKEV2_TRANSFORM_ENCR_TYPE_AES_CBC && tr->key_len) { switch (tr->key_len) { case 16: encr_type = IPSEC_CRYPTO_ALG_AES_CBC_128; break; case 24: encr_type = IPSEC_CRYPTO_ALG_AES_CBC_192; break; case 32: encr_type = IPSEC_CRYPTO_ALG_AES_CBC_256; break; default: ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; break; } } else { ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } } else { ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } tr = ikev2_sa_get_td_for_type(child->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG); if (tr) { if (tr->integ_type != IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA1_96) { ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } } else { ikev2_set_state(sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } hw_if_index = ipsec_add_del_tunnel_if(vnm, &a); if (hw_if_index == VNET_API_ERROR_INVALID_VALUE) { clib_warning("create tunnel interface failed remote-ip %U remote-spi %u", format_ip4_address, &sa->raddr, child->r_proposals[0].spi); ikev2_set_state(sa, IKEV2_STATE_DELETED); return hw_if_index; } ikev2_calc_child_keys(sa, child); ipsec_set_interface_key(vnm, hw_if_index, IPSEC_IF_SET_KEY_TYPE_LOCAL_CRYPTO, encr_type, child->sk_er); ipsec_set_interface_key(vnm, hw_if_index, IPSEC_IF_SET_KEY_TYPE_REMOTE_CRYPTO, encr_type, child->sk_ei); ipsec_set_interface_key(vnm, hw_if_index, IPSEC_IF_SET_KEY_TYPE_LOCAL_INTEG, IPSEC_INTEG_ALG_SHA1_96, child->sk_ar); ipsec_set_interface_key(vnm, hw_if_index, IPSEC_IF_SET_KEY_TYPE_REMOTE_INTEG, IPSEC_INTEG_ALG_SHA1_96, child->sk_ai); return 0; } static int ikev2_delete_tunnel_interface(vnet_main_t * vnm, ikev2_sa_t *sa, ikev2_child_sa_t * child) { ipsec_add_del_tunnel_args_t a; if (!vec_len(child->r_proposals)) return 0; a.is_add = 0; a.local_ip.as_u32 = sa->raddr.as_u32; a.remote_ip.as_u32 = sa->iaddr.as_u32; a.local_spi = child->i_proposals[0].spi; a.remote_spi = child->r_proposals[0].spi; return ipsec_add_del_tunnel_if(vnm, &a); } static u32 ikev2_generate_resp(ikev2_sa_t *sa, ike_header_t * ike) { v8 * integ = 0; ike_payload_header_t * ph; u16 plen; u32 tlen = 0; ikev2_sa_transform_t * tr_encr, *tr_integ; tr_encr = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR); tr_integ = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG); ikev2_payload_chain_t * chain = 0; ikev2_payload_new_chain(chain); if (ike->exchange == IKEV2_EXCHANGE_SA_INIT) { if (sa->r_proposals == 0) { ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_NO_PROPOSAL_CHOSEN, 0); ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); } else if (sa->dh_group == IKEV2_TRANSFORM_DH_TYPE_NONE) { u8 * data = vec_new(u8, 2); ikev2_sa_transform_t * tr_dh; tr_dh = ikev2_sa_get_td_for_type(sa->r_proposals, IKEV2_TRANSFORM_TYPE_DH); ASSERT(tr_dh && tr_dh->dh_type); data[0] = (tr_dh->dh_type >> 8) & 0xff; data[1] = (tr_dh->dh_type) & 0xff; ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_INVALID_KE_PAYLOAD, data); vec_free(data); ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); } else if (sa->state == IKEV2_STATE_NOTIFY_AND_DELETE) { u8 * data = vec_new(u8, 1); data[0] = sa->unsupported_cp; ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD, data); vec_free(data); } else { ike->rspi = clib_host_to_net_u64(sa->rspi); ikev2_payload_add_sa(chain, sa->r_proposals); ikev2_payload_add_ke(chain, sa->dh_group, sa->r_dh_data); ikev2_payload_add_nonce(chain, sa->r_nonce); } } else if (ike->exchange == IKEV2_EXCHANGE_IKE_AUTH) { if (sa->state == IKEV2_STATE_AUTHENTICATED) { ikev2_payload_add_id(chain, &sa->r_id, IKEV2_PAYLOAD_IDR); ikev2_payload_add_auth(chain, &sa->r_auth); ikev2_payload_add_sa(chain, sa->childs[0].r_proposals); ikev2_payload_add_ts(chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI); ikev2_payload_add_ts(chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR); } else if (sa->state == IKEV2_STATE_AUTH_FAILED) { ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_AUTHENTICATION_FAILED, 0); ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); } else if (sa->state == IKEV2_STATE_TS_UNACCEPTABLE) { ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_TS_UNACCEPTABLE, 0); ikev2_payload_add_id(chain, &sa->r_id, IKEV2_PAYLOAD_IDR); ikev2_payload_add_auth(chain, &sa->r_auth); } else if (sa->state == IKEV2_STATE_NO_PROPOSAL_CHOSEN) { ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_NO_PROPOSAL_CHOSEN, 0); ikev2_payload_add_id(chain, &sa->r_id, IKEV2_PAYLOAD_IDR); ikev2_payload_add_auth(chain, &sa->r_auth); ikev2_payload_add_ts(chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI); ikev2_payload_add_ts(chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR); } else if (sa->state == IKEV2_STATE_NOTIFY_AND_DELETE) { u8 * data = vec_new(u8, 1); data[0] = sa->unsupported_cp; ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD, data); vec_free(data); } else { ikev2_set_state(sa, IKEV2_STATE_DELETED); goto done; } } else if (ike->exchange == IKEV2_EXCHANGE_INFORMATIONAL) { /* if pending delete */ if (sa->del) { /* The response to a request that deletes the IKE SA is an empty INFORMATIONAL response. */ if (sa->del[0].protocol_id == IKEV2_PROTOCOL_IKE) { ikev2_set_state(sa, IKEV2_STATE_NOTIFY_AND_DELETE); } /* The response to a request that deletes ESP or AH SAs will contain delete payloads for the paired SAs going in the other direction. */ else { ikev2_payload_add_delete(chain, sa->del); } vec_free(sa->del); sa->del = 0; } /* received N(AUTHENTICATION_FAILED) */ else if (sa->state == IKEV2_STATE_AUTH_FAILED) { ikev2_set_state(sa, IKEV2_STATE_DELETED); goto done; } /* received unsupported critical payload */ else if (sa->unsupported_cp) { u8 * data = vec_new(u8, 1); data[0] = sa->unsupported_cp; ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD, data); vec_free(data); sa->unsupported_cp = 0; } /* else send empty response */ } else if (ike->exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA) { if (sa->rekey) { ikev2_payload_add_sa(chain, sa->rekey[0].r_proposal); ikev2_payload_add_nonce(chain, sa->r_nonce); ikev2_payload_add_ts(chain, sa->rekey[0].tsi, IKEV2_PAYLOAD_TSI); ikev2_payload_add_ts(chain, sa->rekey[0].tsr, IKEV2_PAYLOAD_TSR); vec_del1(sa->rekey, 0); } else if (sa->unsupported_cp) { u8 * data = vec_new(u8, 1); data[0] = sa->unsupported_cp; ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD, data); vec_free(data); sa->unsupported_cp = 0; } else { ikev2_payload_add_notify(chain, IKEV2_NOTIFY_MSG_NO_ADDITIONAL_SAS, 0); } } /* IKEv2 header */ ike->version = IKE_VERSION_2; ike->flags = IKEV2_HDR_FLAG_RESPONSE; ike->nextpayload = IKEV2_PAYLOAD_SK; tlen = sizeof(*ike); if (ike->exchange == IKEV2_EXCHANGE_SA_INIT) { tlen += vec_len(chain->data); ike->nextpayload = chain->first_payload_type; ike->length = clib_host_to_net_u32(tlen); memcpy(ike->payload, chain->data, vec_len(chain->data)); /* store whole IKE payload - needed for PSK auth */ vec_free(sa->last_sa_init_res_packet_data); vec_add(sa->last_sa_init_res_packet_data, ike, tlen); } else { ikev2_payload_chain_add_padding(chain, tr_encr->block_size); /* SK payload */ plen = sizeof(*ph); ph = (ike_payload_header_t *) &ike->payload[0]; ph->nextpayload = chain->first_payload_type; ph->flags = 0; int enc_len = ikev2_encrypt_data(sa, chain->data, ph->payload); plen += enc_len; /* add space for hmac */ plen += tr_integ->key_trunc; tlen += plen; /* payload and total length */ ph->length = clib_host_to_net_u16(plen); ike->length = clib_host_to_net_u32(tlen); /* calc integrity data for whole packet except hash itself */ integ = ikev2_calc_integr(tr_integ, sa->sk_ar, (u8 *) ike, tlen - tr_integ->key_trunc); memcpy(ike->payload + tlen - tr_integ->key_trunc - sizeof(*ike), integ, tr_integ->key_trunc); /* store whole IKE payload - needed for retransmit */ vec_free(sa->last_res_packet_data); vec_add(sa->last_res_packet_data, ike, tlen); } done: ikev2_payload_destroy_chain (chain); vec_free(integ); return tlen; } static int ikev2_retransmit_sa_init (ike_header_t * ike, ip4_address_t iaddr, ip4_address_t raddr) { ikev2_main_t * km = &ikev2_main; ikev2_sa_t * sa; pool_foreach (sa, km->sas, ({ if (sa->ispi == clib_net_to_host_u64(ike->ispi) && sa->iaddr.as_u32 == iaddr.as_u32 && sa->raddr.as_u32 == raddr.as_u32) { int p = 0; u32 len = clib_net_to_host_u32(ike->length); u8 payload = ike->nextpayload; while (p < len && payload!= IKEV2_PAYLOAD_NONE) { ike_payload_header_t * ikep = (ike_payload_header_t *) &ike->payload[p]; u32 plen = clib_net_to_host_u16(ikep->length); if (plen < sizeof(ike_payload_header_t)) return -1; if (payload == IKEV2_PAYLOAD_NONCE) { if (!memcmp(sa->i_nonce, ikep->payload, plen - sizeof(*ikep))) { /* req is retransmit */ if (sa->state == IKEV2_STATE_SA_INIT) { ike_header_t * tmp; tmp = (ike_header_t*)sa->last_sa_init_res_packet_data; ike->ispi = tmp->ispi; ike->rspi = tmp->rspi; ike->nextpayload = tmp->nextpayload; ike->version = tmp->version; ike->exchange = tmp->exchange; ike->flags = tmp->flags; ike->msgid = tmp->msgid; ike->length = tmp->length; memcpy(ike->payload, tmp->payload, clib_net_to_host_u32(tmp->length) - sizeof(*ike)); clib_warning("IKE_SA_INIT retransmit from %U to %U", format_ip4_address, &raddr, format_ip4_address, &iaddr); return 1; } /* else ignore req */ else { clib_warning("IKE_SA_INIT ignore from %U to %U", format_ip4_address, &raddr, format_ip4_address, &iaddr); return -1; } } } payload = ikep->nextpayload; p+=plen; } } })); /* req is not retransmit */ return 0; } static int ikev2_retransmit_resp (ikev2_sa_t * sa, ike_header_t * ike) { u32 msg_id = clib_net_to_host_u32(ike->msgid); /* new req */ if (msg_id > sa->last_msg_id) { sa->last_msg_id = msg_id; return 0; } /* retransmitted req */ else if (msg_id == sa->last_msg_id) { ike_header_t * tmp; tmp = (ike_header_t*)sa->last_res_packet_data; ike->ispi = tmp->ispi; ike->rspi = tmp->rspi; ike->nextpayload = tmp->nextpayload; ike->version = tmp->version; ike->exchange = tmp->exchange; ike->flags = tmp->flags; ike->msgid = tmp->msgid; ike->length = tmp->length; memcpy(ike->payload, tmp->payload, clib_net_to_host_u32(tmp->length) - sizeof(*ike)); clib_warning("IKE msgid %u retransmit from %U to %U", msg_id, format_ip4_address, &sa->raddr, format_ip4_address, &sa->iaddr); return 1; } /* old req ignore */ else { clib_warning("IKE msgid %u req ignore from %U to %U", msg_id, format_ip4_address, &sa->raddr, format_ip4_address, &sa->iaddr); return -1; } } static uword ikev2_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; ikev2_next_t next_index; ikev2_main_t * km = &ikev2_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0 = IKEV2_NEXT_ERROR_DROP; u32 sw_if_index0; ip4_header_t * ip40; udp_header_t * udp0; ike_header_t * ike0; ikev2_sa_t * sa0 = 0; int len = 0; int r; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); ike0 = vlib_buffer_get_current (b0); vlib_buffer_advance(b0, - sizeof(*udp0)); udp0 = vlib_buffer_get_current (b0); vlib_buffer_advance(b0, - sizeof(*ip40)); ip40 = vlib_buffer_get_current (b0); if (ike0->version != IKE_VERSION_2) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_NOT_IKEV2, 1); goto dispatch0; } if (ike0->exchange == IKEV2_EXCHANGE_SA_INIT) { ikev2_sa_t sa; /* temporary store for SA */ sa0 = &sa; memset (sa0, 0, sizeof (*sa0)); if (ike0->rspi == 0) { sa0->raddr.as_u32 = ip40->dst_address.as_u32; sa0->iaddr.as_u32 = ip40->src_address.as_u32; r = ikev2_retransmit_sa_init(ike0, sa0->iaddr, sa0->raddr); if (r == 1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_SA_INIT_RETRANSMIT, 1); len = clib_net_to_host_u32(ike0->length); goto dispatch0; } else if (r == -1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_SA_INIT_IGNORE, 1); goto dispatch0; } ikev2_process_sa_init_req(vm, sa0, ike0); if (sa0->state == IKEV2_STATE_SA_INIT) { ikev2_sa_free_proposal_vector(&sa0->r_proposals); sa0->r_proposals = ikev2_select_proposal(sa0->i_proposals, IKEV2_PROTOCOL_IKE); ikev2_generate_sa_init_data(sa0); } if (sa0->state == IKEV2_STATE_SA_INIT || sa0->state == IKEV2_STATE_NOTIFY_AND_DELETE) { len = ikev2_generate_resp(sa0, ike0); } if (sa0->state == IKEV2_STATE_SA_INIT) { /* add SA to the pool */ pool_get (km->sas, sa0); memcpy(sa0, &sa, sizeof(*sa0)); hash_set (km->sa_by_rspi, sa0->rspi, sa0 - km->sas); } else { ikev2_sa_free_all_vec(sa0); } } } else if (ike0->exchange == IKEV2_EXCHANGE_IKE_AUTH) { uword * p; p = hash_get(km->sa_by_rspi, clib_net_to_host_u64(ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->sas, p[0]); r = ikev2_retransmit_resp(sa0, ike0); if (r == 1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_RETRANSMIT, 1); len = clib_net_to_host_u32(ike0->length); goto dispatch0; } else if (r == -1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_IGNORE, 1); goto dispatch0; } ikev2_process_auth_req(vm, sa0, ike0); ikev2_sa_auth(sa0); if (sa0->state == IKEV2_STATE_AUTHENTICATED) { ikev2_initial_contact_cleanup(sa0); ikev2_sa_match_ts(sa0); if (sa0->state != IKEV2_STATE_TS_UNACCEPTABLE) ikev2_create_tunnel_interface(km->vnet_main, sa0, &sa0->childs[0]); } len = ikev2_generate_resp(sa0, ike0); } } else if (ike0->exchange == IKEV2_EXCHANGE_INFORMATIONAL) { uword * p; p = hash_get(km->sa_by_rspi, clib_net_to_host_u64(ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->sas, p[0]); r = ikev2_retransmit_resp(sa0, ike0); if (r == 1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_RETRANSMIT, 1); len = clib_net_to_host_u32(ike0->length); goto dispatch0; } else if (r == -1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_IGNORE, 1); goto dispatch0; } ikev2_process_informational_req(vm, sa0, ike0); if (sa0->del) { if (sa0->del[0].protocol_id != IKEV2_PROTOCOL_IKE) { ikev2_delete_t * d, * tmp, * resp = 0; vec_foreach(d, sa0->del) { ikev2_child_sa_t * ch_sa; ch_sa = ikev2_sa_get_child(sa0, d->spi, d->protocol_id); if (ch_sa) { ikev2_delete_tunnel_interface(km->vnet_main, sa0, ch_sa); vec_add2(resp, tmp, 1); tmp->protocol_id = d->protocol_id; tmp->spi = ch_sa->r_proposals[0].spi; ikev2_sa_del_child_sa(sa0, ch_sa); } } vec_free(sa0->del); sa0->del = resp; } } len = ikev2_generate_resp(sa0, ike0); } } else if (ike0->exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA) { uword * p; p = hash_get(km->sa_by_rspi, clib_net_to_host_u64(ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->sas, p[0]); r = ikev2_retransmit_resp(sa0, ike0); if (r == 1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_RETRANSMIT, 1); len = clib_net_to_host_u32(ike0->length); goto dispatch0; } else if (r == -1) { vlib_node_increment_counter(vm, ikev2_node.index, IKEV2_ERROR_IKE_REQ_IGNORE, 1); goto dispatch0; } ikev2_process_create_child_sa_req(vm, sa0, ike0); if (sa0->rekey) { if (sa0->rekey[0].protocol_id != IKEV2_PROTOCOL_IKE) { ikev2_child_sa_t * child; vec_add2(sa0->childs, child, 1); child->r_proposals = sa0->rekey[0].r_proposal; child->i_proposals = sa0->rekey[0].i_proposal; child->tsi = sa0->rekey[0].tsi; child->tsr = sa0->rekey[0].tsr; ikev2_create_tunnel_interface(km->vnet_main, sa0, child); } len = ikev2_generate_resp(sa0, ike0); } } } else { clib_warning("IKEv2 exchange %u packet received from %U to %U", ike0->exchange, format_ip4_address, ip40->src_address.as_u8, format_ip4_address, ip40->dst_address.as_u8); hexdump((u8 *) ip40, b0->current_length); } dispatch0: /* if we are sending packet back, rewrite headers */ if (len) { next0 = IKEV2_NEXT_IP4_LOOKUP; ip40->dst_address.as_u32 = sa0->iaddr.as_u32; ip40->src_address.as_u32 = sa0->raddr.as_u32; udp0->length = clib_host_to_net_u16(len + sizeof(udp_header_t)); udp0->checksum = 0; b0->current_length = len + sizeof(ip4_header_t) + sizeof(udp_header_t); ip40->length = clib_host_to_net_u16(b0->current_length); ip40->checksum = ip4_header_checksum (ip40); #if 0 clib_warning("sending response:"); hexdump(vlib_buffer_get_current (b0), b0->current_length); #endif } /* delete sa */ if (sa0 && (sa0->state == IKEV2_STATE_DELETED || sa0->state == IKEV2_STATE_NOTIFY_AND_DELETE)) { ikev2_child_sa_t * c; vec_foreach(c, sa0->childs) ikev2_delete_tunnel_interface(km->vnet_main, sa0, c); ikev2_delete_sa(sa0); } sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { ikev2_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, ikev2_node.index, IKEV2_ERROR_PROCESSED, frame->n_vectors); return frame->n_vectors; } VLIB_REGISTER_NODE (ikev2_node) = { .function = ikev2_node_fn, .name = "ikev2", .vector_size = sizeof (u32), .format_trace = format_ikev2_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(ikev2_error_strings), .error_strings = ikev2_error_strings, .n_next_nodes = IKEV2_N_NEXT, .next_nodes = { [IKEV2_NEXT_IP4_LOOKUP] = "ip4-lookup", [IKEV2_NEXT_ERROR_DROP] = "error-drop", }, }; static ikev2_profile_t * ikev2_profile_index_by_name(u8 * name) { ikev2_main_t * km = &ikev2_main; uword * p; p = mhash_get (&km->profile_index_by_name, name); if (!p) return 0; return pool_elt_at_index(km->profiles, p[0]); } clib_error_t * ikev2_set_local_key(vlib_main_t * vm, u8 * file) { ikev2_main_t * km = &ikev2_main; km->pkey = ikev2_load_key_file(file); if (km->pkey == NULL) return clib_error_return(0, "load key '%s' failed", file); return 0; } clib_error_t * ikev2_add_del_profile(vlib_main_t * vm, u8 * name, int is_add) { ikev2_main_t * km = &ikev2_main; ikev2_profile_t * p; if (is_add) { if (ikev2_profile_index_by_name(name)) return clib_error_return(0, "policy %v already exists", name); pool_get (km->profiles, p); memset(p, 0, sizeof(*p)); p->name = vec_dup(name); uword index = p - km->profiles; mhash_set_mem (&km->profile_index_by_name, name, &index, 0); } else { p = ikev2_profile_index_by_name(name); if (!p) return clib_error_return(0, "policy %v does not exists", name); vec_free (p->name); pool_put (km->profiles, p); mhash_unset (&km->profile_index_by_name, name, 0); } return 0; } clib_error_t * ikev2_set_profile_auth(vlib_main_t * vm, u8 * name, u8 auth_method, u8 * auth_data, u8 data_hex_format) { ikev2_profile_t * p; clib_error_t * r; p = ikev2_profile_index_by_name(name); if (!p) { r = clib_error_return(0, "unknown profile %v", name); return r; } vec_free(p->auth.data); p->auth.method = auth_method; p->auth.data = vec_dup(auth_data); p->auth.hex = data_hex_format; if (auth_method == IKEV2_AUTH_METHOD_RSA_SIG) { if (p->auth.key) EVP_PKEY_free(p->auth.key); p->auth.key = ikev2_load_cert_file(auth_data); if (p->auth.key == NULL) return clib_error_return(0, "load cert '%s' failed", auth_data); } return 0; } clib_error_t * ikev2_set_profile_id(vlib_main_t * vm, u8 * name, u8 id_type, u8 * data, int is_local) { ikev2_profile_t * p; clib_error_t * r; if (id_type > IKEV2_ID_TYPE_ID_RFC822_ADDR && id_type < IKEV2_ID_TYPE_ID_KEY_ID) { r = clib_error_return(0, "unsupported identity type %U", format_ikev2_id_type, id_type); return r; } p = ikev2_profile_index_by_name(name); if (!p) { r = clib_error_return(0, "unknown profile %v", name); return r; } if (is_local) { vec_free(p->loc_id.data); p->loc_id.type = id_type; p->loc_id.data = vec_dup(data); } else { vec_free(p->rem_id.data); p->rem_id.type = id_type; p->rem_id.data = vec_dup(data); } return 0; } clib_error_t * ikev2_set_profile_ts(vlib_main_t * vm, u8 * name, u8 protocol_id, u16 start_port, u16 end_port, ip4_address_t start_addr, ip4_address_t end_addr, int is_local) { ikev2_profile_t * p; clib_error_t * r; p = ikev2_profile_index_by_name(name); if (!p) { r = clib_error_return(0, "unknown profile %v", name); return r; } if (is_local) { p->loc_ts.start_addr.as_u32= start_addr.as_u32; p->loc_ts.end_addr.as_u32 = end_addr.as_u32; p->loc_ts.start_port = start_port; p->loc_ts.end_port = end_port; p->loc_ts.protocol_id = protocol_id; p->loc_ts.ts_type = 7; } else { p->rem_ts.start_addr.as_u32 = start_addr.as_u32; p->rem_ts.end_addr.as_u32 = end_addr.as_u32; p->rem_ts.start_port = start_port; p->rem_ts.end_port = end_port; p->rem_ts.protocol_id = protocol_id; p->rem_ts.ts_type = 7; } return 0; } clib_error_t * ikev2_init (vlib_main_t * vm) { ikev2_main_t * km = &ikev2_main; clib_error_t * error; memset (km, 0, sizeof (ikev2_main_t)); km->vnet_main = vnet_get_main(); km->vlib_main = vm; ikev2_crypto_init(km); km->sa_by_rspi = hash_create (0, sizeof (uword)); mhash_init_vec_string (&km->profile_index_by_name, sizeof (uword)); if ((error = vlib_call_init_function (vm, ikev2_cli_init))) return error; udp_register_dst_port (vm, 500, ikev2_node.index, 1); return 0; }