/* * 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 #include #include #include #include #include #include #include ikev2_main_t ikev2_main; static int ikev2_delete_tunnel_interface (vnet_main_t * vnm, ikev2_sa_t * sa, ikev2_child_sa_t * child); #define ikev2_set_state(sa, v) do { \ (sa)->state = v; \ ikev2_elog_sa_state("ispi %lx SA state changed to " #v, sa->ispi); \ } 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; } static 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); clib_memcpy_fast (new_t, transform, sizeof (*new_t)); new_t->attrs = vec_dup (transform->attrs); } } 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, int by_initiator) { ikev2_child_sa_t *c; vec_foreach (c, sa->childs) { ikev2_sa_proposal_t *proposal = by_initiator ? &c->i_proposals[0] : &c->r_proposals[0]; if (proposal && proposal->spi == spi && proposal->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_child_sa (ikev2_child_sa_t * c) { 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 (c->tsi); vec_free (c->tsr); } 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_child_sa (c); vec_free (*childs); } static void ikev2_sa_del_child_sa (ikev2_sa_t * sa, ikev2_child_sa_t * child) { ikev2_sa_free_child_sa (child); 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); vec_free (sa->dh_private_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; u32 thread_index = vlib_get_thread_index (); uword *p; ikev2_sa_free_all_vec (sa); p = hash_get (km->per_thread_data[thread_index].sa_by_rspi, sa->rspi); if (p) { hash_unset (km->per_thread_data[thread_index].sa_by_rspi, sa->rspi); pool_put (km->per_thread_data[thread_index].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) { sa->dh_group = IKEV2_TRANSFORM_DH_TYPE_NONE; return; } if (sa->is_initiator) { /* generate rspi */ RAND_bytes ((u8 *) & sa->ispi, 8); /* generate nonce */ sa->i_nonce = vec_new (u8, IKEV2_NONCE_SIZE); RAND_bytes ((u8 *) sa->i_nonce, IKEV2_NONCE_SIZE); } else { /* 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_complete_sa_data (ikev2_sa_t * sa, ikev2_sa_t * sai) { ikev2_sa_transform_t *t = 0, *t2; ikev2_main_t *km = &ikev2_main; /*move some data to the new SA */ #define _(A) ({void* __tmp__ = (A); (A) = 0; __tmp__;}) sa->i_nonce = _(sai->i_nonce); sa->i_dh_data = _(sai->i_dh_data); sa->dh_private_key = _(sai->dh_private_key); sa->iaddr.as_u32 = sai->iaddr.as_u32; sa->raddr.as_u32 = sai->raddr.as_u32; sa->is_initiator = sai->is_initiator; sa->i_id.type = sai->i_id.type; sa->profile_index = sai->profile_index; sa->is_profile_index_set = sai->is_profile_index_set; sa->tun_itf = sai->tun_itf; sa->is_tun_itf_set = sai->is_tun_itf_set; sa->i_id.data = _(sai->i_id.data); sa->i_auth.method = sai->i_auth.method; sa->i_auth.hex = sai->i_auth.hex; sa->i_auth.data = _(sai->i_auth.data); sa->i_auth.key = _(sai->i_auth.key); sa->last_sa_init_req_packet_data = _(sai->last_sa_init_req_packet_data); sa->childs = _(sai->childs); sa->udp_encap = sai->udp_encap; sa->dst_port = sai->dst_port; #undef _ 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) { sa->dh_group = IKEV2_TRANSFORM_DH_TYPE_NONE; return; } /* generate dh keys */ ikev2_complete_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; u16 integ_key_len = 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); if (tr_integ) integ_key_len = tr_integ->key_len; 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 */ 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); clib_memcpy_fast (sa->sk_d, keymat + pos, tr_prf->key_trunc); pos += tr_prf->key_trunc; if (integ_key_len) { /* SK_ai */ sa->sk_ai = vec_new (u8, integ_key_len); clib_memcpy_fast (sa->sk_ai, keymat + pos, integ_key_len); pos += integ_key_len; /* SK_ar */ sa->sk_ar = vec_new (u8, integ_key_len); clib_memcpy_fast (sa->sk_ar, keymat + pos, integ_key_len); pos += integ_key_len; } /* SK_ei */ sa->sk_ei = vec_new (u8, tr_encr->key_len); clib_memcpy_fast (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); clib_memcpy_fast (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); clib_memcpy_fast (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); clib_memcpy_fast (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; u16 integ_key_len = 0; u8 salt_len = 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); if (ctr_integ) integ_key_len = ctr_integ->key_len; else salt_len = sizeof (u32); vec_append (s, sa->i_nonce); vec_append (s, sa->r_nonce); /* calculate PRFplus */ u8 *keymat; int len = ctr_encr->key_len * 2 + integ_key_len * 2 + salt_len * 2; keymat = ikev2_calc_prfplus (tr_prf, sa->sk_d, s, len); int pos = 0; /* SK_ei */ child->sk_ei = vec_new (u8, ctr_encr->key_len); clib_memcpy_fast (child->sk_ei, keymat + pos, ctr_encr->key_len); pos += ctr_encr->key_len; if (ctr_integ) { /* SK_ai */ child->sk_ai = vec_new (u8, ctr_integ->key_len); clib_memcpy_fast (child->sk_ai, keymat + pos, ctr_integ->key_len); pos += ctr_integ->key_len; } else { clib_memcpy (&child->salt_ei, keymat + pos, salt_len); pos += salt_len; } /* SK_er */ child->sk_er = vec_new (u8, ctr_encr->key_len); clib_memcpy_fast (child->sk_er, keymat + pos, ctr_encr->key_len); pos += ctr_encr->key_len; if (ctr_integ) { /* SK_ar */ child->sk_ar = vec_new (u8, integ_key_len); clib_memcpy_fast (child->sk_ar, keymat + pos, integ_key_len); pos += integ_key_len; } else { clib_memcpy (&child->salt_er, keymat + pos, salt_len); pos += salt_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; ikev2_elog_exchange ("ispi %lx rspi %lx IKE_INIT request received " "from %d.%d.%d.%d", clib_net_to_host_u64 (ike->ispi), clib_net_to_host_u64 (ike->rspi), sa->iaddr.as_u32); 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 { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", payload); 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 void ikev2_process_sa_init_resp (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; sa->ispi = clib_net_to_host_u64 (ike->ispi); sa->rspi = clib_net_to_host_u64 (ike->rspi); ikev2_elog_exchange ("ispi %lx rspi %lx IKE_INIT response received " "from %d.%d.%d.%d", sa->ispi, sa->rspi, sa->raddr.as_u32); /* 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, 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->r_proposals); sa->r_proposals = ikev2_parse_sa_payload (ikep); if (sa->r_proposals) { ikev2_set_state (sa, IKEV2_STATE_SA_INIT); ike->msgid = clib_host_to_net_u32 (clib_net_to_host_u32 (ike->msgid) + 1); } } 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->r_dh_data); vec_add (sa->r_dh_data, ke->payload, plen - sizeof (*ke)); } else if (payload == IKEV2_PAYLOAD_NONCE) { vec_free (sa->r_nonce); vec_add (sa->r_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 { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", payload); 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; } } 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 = 0; u32 plen = 0; 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) { last_payload = *payload; } else { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", *payload); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { sa->unsupported_cp = *payload; return 0; } } *payload = ikep->nextpayload; p += plen; } if (last_payload != IKEV2_PAYLOAD_SK) { ikev2_elog_error ("Last payload must be SK"); return 0; } hmac = ikev2_calc_integr (tr_integ, sa->is_initiator ? sa->sk_ar : 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)) { ikev2_elog_error ("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; u32 thread_index = vlib_get_thread_index (); if (!sa->initial_contact) return; /* find old IKE SAs with the same authenticated identity */ /* *INDENT-OFF* */ pool_foreach (tmp, km->per_thread_data[thread_index].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->per_thread_data[thread_index].sas); })); /* *INDENT-ON* */ for (i = 0; i < vec_len (delete); i++) { tmp = pool_elt_at_index (km->per_thread_data[thread_index].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; u8 payload = ike->nextpayload; u8 *plaintext = 0; ike_payload_header_t *ikep; u32 plen; ikev2_elog_exchange ("ispi %lx rspi %lx EXCHANGE_IKE_AUTH received " "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi), clib_host_to_net_u64 (ike->rspi), sa->is_initiator ? sa->raddr.as_u32 : sa-> iaddr.as_u32); 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; } /* select or create 1st child SA */ if (sa->is_initiator) { first_child_sa = &sa->childs[0]; } else { 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 */ { if (sa->is_initiator) { ikev2_sa_free_proposal_vector (&first_child_sa->r_proposals); first_child_sa->r_proposals = ikev2_parse_sa_payload (ikep); } else { 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)); } else if (payload == IKEV2_PAYLOAD_IDR) /* 36 */ { ike_id_payload_header_t *id = (ike_id_payload_header_t *) ikep; sa->r_id.type = id->id_type; vec_free (sa->r_id.data); vec_add (sa->r_id.data, id->payload, plen - sizeof (*id)); } else if (payload == IKEV2_PAYLOAD_AUTH) /* 39 */ { ike_auth_payload_header_t *a = (ike_auth_payload_header_t *) ikep; if (sa->is_initiator) { sa->r_auth.method = a->auth_method; vec_free (sa->r_auth.data); vec_add (sa->r_auth.data, a->payload, plen - sizeof (*a)); } else { sa->i_auth.method = a->auth_method; vec_free (sa->i_auth.data); vec_add (sa->i_auth.data, a->payload, plen - sizeof (*a)); } } 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 */ { vec_free (first_child_sa->tsi); first_child_sa->tsi = ikev2_parse_ts_payload (ikep); } else if (payload == IKEV2_PAYLOAD_TSR) /* 45 */ { vec_free (first_child_sa->tsr); first_child_sa->tsr = ikev2_parse_ts_payload (ikep); } else { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", payload); 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; u8 payload = ike->nextpayload; u8 *plaintext = 0; ike_payload_header_t *ikep; u32 plen; ikev2_elog_exchange ("ispi %lx rspi %lx INFORMATIONAL received " "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi), clib_host_to_net_u64 (ike->rspi), sa->iaddr.as_u32); 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 { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", payload); 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; u8 payload = ike->nextpayload; u8 *plaintext = 0; u8 rekeying = 0; u8 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; ikev2_elog_exchange ("ispi %lx rspi %lx CREATE_CHILD_SA received " "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi), clib_host_to_net_u64 (ike->rspi), sa->raddr.as_u32); 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) { clib_memcpy_fast (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 { ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d", payload); if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL) { sa->unsupported_cp = payload; return; } } payload = ikep->nextpayload; p += plen; } if (sa->is_initiator && proposal->protocol_id == IKEV2_PROTOCOL_ESP) { ikev2_rekey_t *rekey = &sa->rekey[0]; rekey->protocol_id = proposal->protocol_id; rekey->i_proposal = ikev2_select_proposal (proposal, IKEV2_PROTOCOL_ESP); rekey->i_proposal->spi = rekey->spi; rekey->r_proposal = proposal; rekey->tsi = tsi; rekey->tsr = tsr; /* update Nr */ vec_free (sa->r_nonce); vec_add (sa->r_nonce, nonce, IKEV2_NONCE_SIZE); child_sa = ikev2_sa_get_child (sa, rekey->ispi, IKEV2_PROTOCOL_ESP, 1); if (child_sa) { child_sa->rekey_retries = 0; } } else if (rekeying) { ikev2_rekey_t *rekey; child_sa = ikev2_sa_get_child (sa, n->spi, n->protocol_id, 1); if (!child_sa) { ikev2_elog_uint (IKEV2_LOG_ERROR, "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, 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, *p_tsi, *p_tsr, *tsi = 0, *tsr = 0; ikev2_id_t *id; /* *INDENT-OFF* */ pool_foreach (p, km->profiles, ({ if (sa->is_initiator) { p_tsi = &p->loc_ts; p_tsr = &p->rem_ts; id = &sa->r_id; } else { p_tsi = &p->rem_ts; p_tsr = &p->loc_ts; id = &sa->i_id; } /* check id */ if (p->rem_id.type != id->type || vec_len(p->rem_id.data) != vec_len(id->data) || memcmp(p->rem_id.data, id->data, vec_len(p->rem_id.data))) continue; vec_foreach(ts, sa->childs[0].tsi) { if (ikev2_ts_cmp(p_tsi, ts)) { vec_add1 (tsi, ts[0]); break; } } vec_foreach(ts, sa->childs[0].tsr) { if (ikev2_ts_cmp(p_tsr, ts)) { vec_add1 (tsr, ts[0]); break; } } break; })); /* *INDENT-ON* */ 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)) { ikev2_elog_uint (IKEV2_LOG_ERROR, "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, sa->is_initiator); ikev2_id_t *sa_id; ikev2_auth_t *sa_auth; if (sa->is_initiator) { sa_id = &sa->r_id; sa_auth = &sa->r_auth; } else { sa_id = &sa->i_id; sa_auth = &sa->i_auth; } /* *INDENT-OFF* */ pool_foreach (p, km->profiles, ({ /* check id */ if (p->rem_id.type != sa_id->type || vec_len(p->rem_id.data) != vec_len(sa_id->data) || memcmp(p->rem_id.data, sa_id->data, vec_len(p->rem_id.data))) continue; if (sa_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_auth->data, vec_len(sa_auth->data))) { ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED); vec_free(auth); sel_p = p; break; } } else if (sa_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_auth->data, authmsg) == 1) { ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED); sel_p = p; break; } } vec_free(auth); vec_free(psk); })); /* *INDENT-ON* */ if (sel_p) { sa->udp_encap = sel_p->udp_encap; sa->dst_port = sel_p->dst_port; } vec_free (authmsg); if (sa->state == IKEV2_STATE_AUTHENTICATED) { if (!sa->is_initiator) { 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); if (~0 != sel_p->tun_itf) { sa->is_tun_itf_set = 1; sa->tun_itf = sel_p->tun_itf; } } } else { ikev2_elog_uint (IKEV2_LOG_ERROR, "authentication failed, no matching " "profile found! ispi %lx", sa->ispi); ikev2_set_state (sa, IKEV2_STATE_AUTH_FAILED); } vec_free (psk); vec_free (key_pad); } static void ikev2_sa_auth_init (ikev2_sa_t * sa) { ikev2_main_t *km = &ikev2_main; 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)) { ikev2_elog_uint (IKEV2_LOG_ERROR, "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); psk = ikev2_calc_prf (tr_prf, sa->i_auth.data, key_pad); auth = ikev2_calc_prf (tr_prf, psk, authmsg); if (sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC) { sa->i_auth.data = ikev2_calc_prf (tr_prf, psk, authmsg); sa->i_auth.method = IKEV2_AUTH_METHOD_SHARED_KEY_MIC; } else if (sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG) { sa->i_auth.data = ikev2_calc_sign (km->pkey, authmsg); sa->i_auth.method = IKEV2_AUTH_METHOD_RSA_SIG; } vec_free (psk); vec_free (key_pad); vec_free (auth); vec_free (authmsg); } static u32 ikev2_mk_local_sa_id (u32 sai, u32 ci, u32 ti) { return (0x80000000 | (ti << 24) | (sai << 12) | ci); } static u32 ikev2_mk_remote_sa_id (u32 sai, u32 ci, u32 ti) { return (0xc0000000 | (ti << 24) | (sai << 12) | ci); } typedef struct { u32 sw_if_index; u32 salt_local; u32 salt_remote; u32 local_sa_id; u32 remote_sa_id; ipsec_sa_flags_t flags; u32 local_spi; u32 remote_spi; ipsec_crypto_alg_t encr_type; ipsec_integ_alg_t integ_type; ip46_address_t local_ip; ip46_address_t remote_ip; ipsec_key_t loc_ckey, rem_ckey, loc_ikey, rem_ikey; u8 is_rekey; u32 old_remote_sa_id; u16 dst_port; } ikev2_add_ipsec_tunnel_args_t; static void ikev2_add_tunnel_from_main (ikev2_add_ipsec_tunnel_args_t * a) { ikev2_main_t *km = &ikev2_main; u32 sw_if_index; int rv = 0; if (~0 == a->sw_if_index) { /* no tunnel associated with the SA/profile - create a new one */ rv = ipip_add_tunnel (IPIP_TRANSPORT_IP4, ~0, &a->local_ip, &a->remote_ip, 0, TUNNEL_ENCAP_DECAP_FLAG_NONE, IP_DSCP_CS0, TUNNEL_MODE_P2P, &sw_if_index); if (rv == VNET_API_ERROR_IF_ALREADY_EXISTS) { if (hash_get (km->sw_if_indices, sw_if_index)) /* interface is managed by IKE; proceed with updating SAs */ rv = 0; } hash_set1 (km->sw_if_indices, sw_if_index); } else { sw_if_index = a->sw_if_index; vnet_sw_interface_admin_up (vnet_get_main (), sw_if_index); } if (rv) { ikev2_elog_peers (IKEV2_LOG_ERROR, "installing ipip tunnel failed! " "loc:%d.%d.%d.%d rem:%d.%d.%d.%d", a->local_ip.ip4.as_u32, a->remote_ip.ip4.as_u32); return; } u32 *sas_in = NULL; vec_add1 (sas_in, a->remote_sa_id); if (a->is_rekey) { ipsec_tun_protect_del (sw_if_index, NULL); /* replace local SA immediately */ ipsec_sa_unlock_id (a->local_sa_id); /* keep the old sa */ vec_add1 (sas_in, a->old_remote_sa_id); } rv |= ipsec_sa_add_and_lock (a->local_sa_id, a->local_spi, IPSEC_PROTOCOL_ESP, a->encr_type, &a->loc_ckey, a->integ_type, &a->loc_ikey, a->flags, 0, a->salt_local, &a->local_ip, &a->remote_ip, NULL, a->dst_port); rv |= ipsec_sa_add_and_lock (a->remote_sa_id, a->remote_spi, IPSEC_PROTOCOL_ESP, a->encr_type, &a->rem_ckey, a->integ_type, &a->rem_ikey, (a->flags | IPSEC_SA_FLAG_IS_INBOUND), 0, a->salt_remote, &a->remote_ip, &a->local_ip, NULL, a->dst_port); rv |= ipsec_tun_protect_update (sw_if_index, NULL, a->local_sa_id, sas_in); } static int ikev2_create_tunnel_interface (vnet_main_t * vnm, u32 thread_index, ikev2_sa_t * sa, ikev2_child_sa_t * child, u32 sa_index, u32 child_index, u8 is_rekey) { ikev2_main_t *km = &ikev2_main; ipsec_crypto_alg_t encr_type; ipsec_integ_alg_t integ_type; ikev2_profile_t *p = 0; ikev2_sa_transform_t *tr; ikev2_sa_proposal_t *proposals; u8 is_aead = 0; ikev2_add_ipsec_tunnel_args_t a; clib_memset (&a, 0, sizeof (a)); if (!child->r_proposals) { ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } if (sa->is_initiator) { ip46_address_set_ip4 (&a.local_ip, &sa->iaddr); ip46_address_set_ip4 (&a.remote_ip, &sa->raddr); proposals = child->i_proposals; a.local_spi = child->r_proposals[0].spi; a.remote_spi = child->i_proposals[0].spi; } else { ip46_address_set_ip4 (&a.local_ip, &sa->raddr); ip46_address_set_ip4 (&a.remote_ip, &sa->iaddr); proposals = child->r_proposals; a.local_spi = child->i_proposals[0].spi; a.remote_spi = child->r_proposals[0].spi; } a.flags = IPSEC_SA_FLAG_USE_ANTI_REPLAY; a.flags |= IPSEC_SA_FLAG_IS_TUNNEL; if (sa->udp_encap) a.flags |= IPSEC_SA_FLAG_UDP_ENCAP; a.is_rekey = is_rekey; tr = ikev2_sa_get_td_for_type (proposals, IKEV2_TRANSFORM_TYPE_ESN); if (tr && tr->esn_type) a.flags |= IPSEC_SA_FLAG_USE_ESN; tr = ikev2_sa_get_td_for_type (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 if (tr->encr_type == IKEV2_TRANSFORM_ENCR_TYPE_AES_GCM_16 && tr->key_len) { switch (tr->key_len) { case 16: encr_type = IPSEC_CRYPTO_ALG_AES_GCM_128; break; case 24: encr_type = IPSEC_CRYPTO_ALG_AES_GCM_192; break; case 32: encr_type = IPSEC_CRYPTO_ALG_AES_GCM_256; break; default: ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; break; } is_aead = 1; } else { ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } } else { ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } a.encr_type = encr_type; if (!is_aead) { tr = ikev2_sa_get_td_for_type (proposals, IKEV2_TRANSFORM_TYPE_INTEG); if (tr) { switch (tr->integ_type) { case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_256_128: integ_type = IPSEC_INTEG_ALG_SHA_256_128; break; case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_384_192: integ_type = IPSEC_INTEG_ALG_SHA_384_192; break; case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_512_256: integ_type = IPSEC_INTEG_ALG_SHA_512_256; break; case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA1_96: integ_type = IPSEC_INTEG_ALG_SHA1_96; break; default: ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } } else { ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); return 1; } } else { integ_type = IPSEC_INTEG_ALG_NONE; } a.integ_type = integ_type; ikev2_calc_child_keys (sa, child); if (sa->is_initiator) { ipsec_mk_key (&a.loc_ikey, child->sk_ai, vec_len (child->sk_ai)); ipsec_mk_key (&a.rem_ikey, child->sk_ar, vec_len (child->sk_ar)); ipsec_mk_key (&a.loc_ckey, child->sk_ei, vec_len (child->sk_ei)); ipsec_mk_key (&a.rem_ckey, child->sk_er, vec_len (child->sk_er)); if (is_aead) { a.salt_remote = child->salt_er; a.salt_local = child->salt_ei; } } else { ipsec_mk_key (&a.loc_ikey, child->sk_ar, vec_len (child->sk_ar)); ipsec_mk_key (&a.rem_ikey, child->sk_ai, vec_len (child->sk_ai)); ipsec_mk_key (&a.loc_ckey, child->sk_er, vec_len (child->sk_er)); ipsec_mk_key (&a.rem_ckey, child->sk_ei, vec_len (child->sk_ei)); if (is_aead) { a.salt_remote = child->salt_ei; a.salt_local = child->salt_er; } } if (sa->is_profile_index_set) p = pool_elt_at_index (km->profiles, sa->profile_index); if (p && p->lifetime) { child->time_to_expiration = vlib_time_now (vnm->vlib_main) + p->lifetime; if (p->lifetime_jitter) { // This is not much better than rand(3), which Coverity warns // is unsuitable for security applications; random_u32 is // however fast. If this perturbance to the expiration time // needs to use a better RNG then we may need to use something // like /dev/urandom which has significant overhead. u32 rnd = (u32) (vlib_time_now (vnm->vlib_main) * 1e6); rnd = random_u32 (&rnd); child->time_to_expiration += 1 + (rnd % p->lifetime_jitter); } } if (thread_index & 0xffffffc0) ikev2_elog_error ("error: thread index exceeds max range 0x3f!"); if (child_index & 0xfffff000 || sa_index & 0xfffff000) ikev2_elog_error ("error: sa/child index exceeds max range 0xfff!"); child->local_sa_id = a.local_sa_id = ikev2_mk_local_sa_id (sa_index, child_index, thread_index); u32 remote_sa_id = ikev2_mk_remote_sa_id (sa_index, child_index, thread_index); if (is_rekey) { /* create a new remote SA ID to keep the old SA for a bit longer * so the peer has some time to swap their SAs */ /* use most significat bit of child index part in id */ u32 mask = 0x800; if (sa->current_remote_id_mask) { sa->old_remote_id = a.old_remote_sa_id = remote_sa_id | mask; sa->current_remote_id_mask = 0; } else { sa->old_remote_id = a.old_remote_sa_id = remote_sa_id; sa->current_remote_id_mask = mask; remote_sa_id |= mask; } sa->old_id_expiration = 3.0; sa->old_remote_id_present = 1; } child->remote_sa_id = a.remote_sa_id = remote_sa_id; a.sw_if_index = (sa->is_tun_itf_set ? sa->tun_itf : ~0); a.dst_port = sa->dst_port; vl_api_rpc_call_main_thread (ikev2_add_tunnel_from_main, (u8 *) & a, sizeof (a)); return 0; } typedef struct { ip46_address_t local_ip; ip46_address_t remote_ip; u32 remote_sa_id; u32 local_sa_id; u32 sw_if_index; } ikev2_del_ipsec_tunnel_args_t; static_always_inline u32 ikev2_flip_alternate_sa_bit (u32 id) { u32 mask = 0x800; if (mask & id) return id & ~mask; return id | mask; } static void ikev2_del_tunnel_from_main (ikev2_del_ipsec_tunnel_args_t * a) { ikev2_main_t *km = &ikev2_main; ipip_tunnel_t *ipip = NULL; u32 sw_if_index; if (~0 == a->sw_if_index) { /* *INDENT-OFF* */ ipip_tunnel_key_t key = { .src = a->local_ip, .dst = a->remote_ip, .transport = IPIP_TRANSPORT_IP4, .fib_index = 0, }; /* *INDENT-ON* */ ipip = ipip_tunnel_db_find (&key); if (ipip) { sw_if_index = ipip->sw_if_index; hash_unset (km->sw_if_indices, ipip->sw_if_index); } else sw_if_index = ~0; } else { sw_if_index = a->sw_if_index; vnet_sw_interface_admin_down (vnet_get_main (), sw_if_index); } if (~0 != sw_if_index) ipsec_tun_protect_del (sw_if_index, NULL); ipsec_sa_unlock_id (a->remote_sa_id); ipsec_sa_unlock_id (a->local_sa_id); ipsec_sa_unlock_id (ikev2_flip_alternate_sa_bit (a->remote_sa_id)); if (ipip) ipip_del_tunnel (ipip->sw_if_index); } static int ikev2_delete_tunnel_interface (vnet_main_t * vnm, ikev2_sa_t * sa, ikev2_child_sa_t * child) { ikev2_del_ipsec_tunnel_args_t a; clib_memset (&a, 0, sizeof (a)); if (sa->is_initiator) { ip46_address_set_ip4 (&a.local_ip, &sa->iaddr); ip46_address_set_ip4 (&a.remote_ip, &sa->raddr); } else { ip46_address_set_ip4 (&a.local_ip, &sa->raddr); ip46_address_set_ip4 (&a.remote_ip, &sa->iaddr); } a.remote_sa_id = child->remote_sa_id; a.local_sa_id = child->local_sa_id; a.sw_if_index = (sa->is_tun_itf_set ? sa->tun_itf : ~0); vl_api_rpc_call_main_thread (ikev2_del_tunnel_from_main, (u8 *) & a, sizeof (a)); return 0; } static u32 ikev2_generate_message (ikev2_sa_t * sa, ike_header_t * ike, void *user) { 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 if (sa->state == IKEV2_STATE_SA_INIT) { ikev2_payload_add_id (chain, &sa->i_id, IKEV2_PAYLOAD_IDI); ikev2_payload_add_auth (chain, &sa->i_auth); ikev2_payload_add_sa (chain, sa->childs[0].i_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); ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_INITIAL_CONTACT, 0); } else { ikev2_set_state (sa, IKEV2_STATE_DELETED); goto done; } } else if (ike->exchange == IKEV2_EXCHANGE_INFORMATIONAL) { /* if pending delete */ if (sa->del) { if (sa->del[0].protocol_id == IKEV2_PROTOCOL_IKE) { if (sa->is_initiator) ikev2_payload_add_delete (chain, sa->del); /* The response to a request that deletes the IKE SA is an empty INFORMATIONAL response. */ 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->is_initiator) { ikev2_sa_proposal_t *proposals = (ikev2_sa_proposal_t *) user; ikev2_notify_t notify; u8 *data = vec_new (u8, 4); clib_memset (¬ify, 0, sizeof (notify)); notify.protocol_id = IKEV2_PROTOCOL_ESP; notify.spi = sa->childs[0].i_proposals->spi; *(u32 *) data = clib_host_to_net_u32 (notify.spi); ikev2_payload_add_sa (chain, proposals); ikev2_payload_add_nonce (chain, sa->i_nonce); ikev2_payload_add_ts (chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI); ikev2_payload_add_ts (chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR); ikev2_payload_add_notify_2 (chain, IKEV2_NOTIFY_MSG_REKEY_SA, data, ¬ify); vec_free (data); } else { 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->nextpayload = IKEV2_PAYLOAD_SK; tlen = sizeof (*ike); if (sa->is_initiator) { ike->flags = IKEV2_HDR_FLAG_INITIATOR; sa->last_init_msg_id = clib_net_to_host_u32 (ike->msgid); } else { ike->flags = IKEV2_HDR_FLAG_RESPONSE; } 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); clib_memcpy_fast (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->is_initiator ? sa->sk_ai : sa->sk_ar, (u8 *) ike, tlen - tr_integ->key_trunc); clib_memcpy_fast (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; u32 thread_index = vlib_get_thread_index (); /* *INDENT-OFF* */ pool_foreach (sa, km->per_thread_data[thread_index].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; clib_memcpy_fast(ike->payload, tmp->payload, clib_net_to_host_u32(tmp->length) - sizeof(*ike)); ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "ispi %lx IKE_SA_INIT retransmit " "from %d.%d.%d.%d to %d.%d.%d.%d", ike->ispi, raddr.as_u32, iaddr.as_u32); return 1; } /* else ignore req */ else { ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "ispi %lx IKE_SA_INIT ignore " "from %d.%d.%d.%d to %d.%d.%d.%d", ike->ispi, raddr.as_u32, iaddr.as_u32); return -1; } } } payload = ikep->nextpayload; p+=plen; } } })); /* *INDENT-ON* */ /* 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; clib_memcpy_fast (ike->payload, tmp->payload, clib_net_to_host_u32 (tmp->length) - sizeof (*ike)); ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "IKE retransmit msgid %d", msg_id, sa->raddr.as_u32, sa->iaddr.as_u32); return 1; } /* old req ignore */ else { ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "IKE req ignore msgid %d", msg_id, sa->raddr.as_u32, sa->iaddr.as_u32); } 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; u32 thread_index = vlib_get_thread_index (); 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; ikev2_sa_t sa; /* temporary store for SA */ 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) { sa0 = &sa; clib_memset (sa0, 0, sizeof (*sa0)); if (ike0->flags & IKEV2_HDR_FLAG_INITIATOR) { 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_message (sa0, ike0, 0); } if (sa0->state == IKEV2_STATE_SA_INIT) { /* add SA to the pool */ pool_get (km->per_thread_data[thread_index].sas, sa0); clib_memcpy_fast (sa0, &sa, sizeof (*sa0)); hash_set (km-> per_thread_data[thread_index].sa_by_rspi, sa0->rspi, sa0 - km->per_thread_data[thread_index].sas); } else { ikev2_sa_free_all_vec (sa0); } } } else //received sa_init without initiator flag { ikev2_process_sa_init_resp (vm, sa0, ike0); if (sa0->state == IKEV2_STATE_SA_INIT) { ike0->exchange = IKEV2_EXCHANGE_IKE_AUTH; uword *p = hash_get (km->sa_by_ispi, ike0->ispi); if (p) { ikev2_sa_t *sai = pool_elt_at_index (km->sais, p[0]); ikev2_complete_sa_data (sa0, sai); ikev2_calc_keys (sa0); ikev2_sa_auth_init (sa0); len = ikev2_generate_message (sa0, ike0, 0); } } if (sa0->state == IKEV2_STATE_SA_INIT) { /* add SA to the pool */ pool_get (km->per_thread_data[thread_index].sas, sa0); clib_memcpy_fast (sa0, &sa, sizeof (*sa0)); hash_set (km->per_thread_data[thread_index].sa_by_rspi, sa0->rspi, sa0 - km->per_thread_data[thread_index].sas); } else { ikev2_sa_free_all_vec (sa0); } } } else if (ike0->exchange == IKEV2_EXCHANGE_IKE_AUTH) { uword *p; p = hash_get (km->per_thread_data[thread_index].sa_by_rspi, clib_net_to_host_u64 (ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->per_thread_data[thread_index].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, thread_index, sa0, &sa0->childs[0], p[0], 0, 0); } if (sa0->is_initiator) { uword *p = hash_get (km->sa_by_ispi, ike0->ispi); if (p) { ikev2_sa_t *sai = pool_elt_at_index (km->sais, p[0]); hash_unset (km->sa_by_ispi, sai->ispi); ikev2_sa_free_all_vec (sai); pool_put (km->sais, sai); } } else { len = ikev2_generate_message (sa0, ike0, 0); } } } else if (ike0->exchange == IKEV2_EXCHANGE_INFORMATIONAL) { uword *p; p = hash_get (km->per_thread_data[thread_index].sa_by_rspi, clib_net_to_host_u64 (ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->per_thread_data[thread_index].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, !sa0->is_initiator); if (ch_sa) { ikev2_delete_tunnel_interface (km->vnet_main, sa0, ch_sa); if (!sa0->is_initiator) { 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); } } if (!sa0->is_initiator) { vec_free (sa0->del); sa0->del = resp; } } } if (!sa0->is_initiator) { len = ikev2_generate_message (sa0, ike0, 0); } } } else if (ike0->exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA) { uword *p; p = hash_get (km->per_thread_data[thread_index].sa_by_rspi, clib_net_to_host_u64 (ike0->rspi)); if (p) { sa0 = pool_elt_at_index (km->per_thread_data[thread_index].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) { if (sa0->childs) vec_free (sa0->childs); 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, thread_index, sa0, child, p[0], child - sa0->childs, 1); } if (sa0->is_initiator) { vec_del1 (sa0->rekey, 0); } else { len = ikev2_generate_message (sa0, ike0, 0); } } } } else { ikev2_elog_uint_peers (IKEV2_LOG_WARNING, "IKEv2 exchange %d " "received from %d.%d.%d.%d to %d.%d.%d.%d", ike0->exchange, ip40->src_address.as_u32, ip40->dst_address.as_u32); } dispatch0: /* if we are sending packet back, rewrite headers */ if (len) { next0 = IKEV2_NEXT_IP4_LOOKUP; if (sa0->is_initiator) { ip40->dst_address.as_u32 = sa0->raddr.as_u32; ip40->src_address.as_u32 = sa0->iaddr.as_u32; } else { 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); } /* 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; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ikev2_node,static) = { .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", }, }; /* *INDENT-ON* */ // set ikev2 proposals when vpp is used as initiator static clib_error_t * ikev2_set_initiator_proposals (vlib_main_t * vm, ikev2_sa_t * sa, ikev2_transforms_set * ts, ikev2_sa_proposal_t ** proposals, int is_ike) { clib_error_t *r; ikev2_main_t *km = &ikev2_main; ikev2_sa_proposal_t *proposal; vec_add2 (*proposals, proposal, 1); ikev2_sa_transform_t *td; int error; /* Encryption */ error = 1; vec_foreach (td, km->supported_transforms) { if (td->type == IKEV2_TRANSFORM_TYPE_ENCR && td->encr_type == ts->crypto_alg && td->key_len == ts->crypto_key_size / 8) { u16 attr[2]; attr[0] = clib_host_to_net_u16 (14 | (1 << 15)); attr[1] = clib_host_to_net_u16 (td->key_len << 3); vec_add (td->attrs, (u8 *) attr, 4); vec_add1 (proposal->transforms, *td); td->attrs = 0; error = 0; break; } } if (error) { r = clib_error_return (0, "Unsupported algorithm"); return r; } if (IKEV2_TRANSFORM_ENCR_TYPE_AES_GCM_16 != ts->crypto_alg) { /* Integrity */ error = 1; vec_foreach (td, km->supported_transforms) { if (td->type == IKEV2_TRANSFORM_TYPE_INTEG && td->integ_type == ts->integ_alg) { vec_add1 (proposal->transforms, *td); error = 0; break; } } if (error) { ikev2_elog_error ("Didn't find any supported algorithm for IKEV2_TRANSFORM_TYPE_INTEG"); r = clib_error_return (0, "Unsupported algorithm"); return r; } } /* PRF */ if (is_ike) { error = 1; vec_foreach (td, km->supported_transforms) { if (td->type == IKEV2_TRANSFORM_TYPE_PRF && td->prf_type == IKEV2_TRANSFORM_PRF_TYPE_PRF_HMAC_SHA2_256) { vec_add1 (proposal->transforms, *td); error = 0; break; } } if (error) { r = clib_error_return (0, "Unsupported algorithm"); return r; } } /* DH */ if (is_ike || ts->dh_type != IKEV2_TRANSFORM_DH_TYPE_NONE) { error = 1; vec_foreach (td, km->supported_transforms) { if (td->type == IKEV2_TRANSFORM_TYPE_DH && td->dh_type == ts->dh_type) { vec_add1 (proposal->transforms, *td); if (is_ike) { sa->dh_group = td->dh_type; } error = 0; break; } } if (error) { r = clib_error_return (0, "Unsupported algorithm"); return r; } } if (!is_ike) { error = 1; vec_foreach (td, km->supported_transforms) { if (td->type == IKEV2_TRANSFORM_TYPE_ESN) { vec_add1 (proposal->transforms, *td); error = 0; break; } } if (error) { r = clib_error_return (0, "Unsupported algorithm"); return r; } } return 0; } 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]); } static void ikev2_send_ike (vlib_main_t * vm, ip4_address_t * src, ip4_address_t * dst, u32 bi0, u32 len) { ip4_header_t *ip40; udp_header_t *udp0; vlib_buffer_t *b0; vlib_frame_t *f; u32 *to_next; b0 = vlib_get_buffer (vm, bi0); vlib_buffer_advance (b0, -sizeof (udp_header_t)); udp0 = vlib_buffer_get_current (b0); vlib_buffer_advance (b0, -sizeof (ip4_header_t)); ip40 = vlib_buffer_get_current (b0); ip40->ip_version_and_header_length = 0x45; ip40->tos = 0; ip40->fragment_id = 0; ip40->flags_and_fragment_offset = 0; ip40->ttl = 0xff; ip40->protocol = IP_PROTOCOL_UDP; ip40->dst_address.as_u32 = dst->as_u32; ip40->src_address.as_u32 = src->as_u32; udp0->dst_port = clib_host_to_net_u16 (500); udp0->src_port = clib_host_to_net_u16 (500); 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); /* send the request */ f = vlib_get_frame_to_node (vm, ip4_lookup_node.index); to_next = vlib_frame_vector_args (f); to_next[0] = bi0; f->n_vectors = 1; vlib_put_frame_to_node (vm, ip4_lookup_node.index, f); } static u32 ikev2_get_new_ike_header_buff (vlib_main_t * vm, ike_header_t ** ike) { u32 bi0; if (vlib_buffer_alloc (vm, &bi0, 1) != 1) { *ike = 0; return 0; } vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); *ike = vlib_buffer_get_current (b0); return bi0; } 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; } static_always_inline vnet_api_error_t ikev2_register_udp_port (ikev2_profile_t * p, u16 port) { ikev2_main_t *km = &ikev2_main; udp_dst_port_info_t *pi; uword *v = hash_get (km->udp_ports, port); pi = udp_get_dst_port_info (&udp_main, port, UDP_IP4); if (v) { /* IKE already uses this port, only increment reference counter */ ASSERT (pi); v[0]++; } else { if (pi) return VNET_API_ERROR_UDP_PORT_TAKEN; udp_register_dst_port (km->vlib_main, port, ipsec4_tun_input_node.index, 1); hash_set (km->udp_ports, port, 1); } p->dst_port = port; return 0; } static_always_inline void ikev2_unregister_udp_port (ikev2_profile_t * p) { ikev2_main_t *km = &ikev2_main; uword *v; if (p->dst_port == IPSEC_UDP_PORT_NONE) return; v = hash_get (km->udp_ports, p->dst_port); if (!v) return; v[0]--; if (v[0] == 0) { udp_unregister_dst_port (km->vlib_main, p->dst_port, 1); hash_unset (km->udp_ports, p->dst_port); } p->dst_port = IPSEC_UDP_PORT_NONE; } 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); clib_memset (p, 0, sizeof (*p)); p->name = vec_dup (name); p->dst_port = IPSEC_UDP_PORT_NONE; p->responder.sw_if_index = ~0; p->tun_itf = ~0; 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); ikev2_unregister_udp_port (p); 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) { vec_add1 (p->auth.data, 0); 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_set_profile_responder (vlib_main_t * vm, u8 * name, u32 sw_if_index, ip4_address_t ip4) { 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; } p->responder.sw_if_index = sw_if_index; p->responder.ip4 = ip4; return 0; } clib_error_t * ikev2_set_profile_ike_transforms (vlib_main_t * vm, u8 * name, ikev2_transform_encr_type_t crypto_alg, ikev2_transform_integ_type_t integ_alg, ikev2_transform_dh_type_t dh_type, u32 crypto_key_size) { 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; } p->ike_ts.crypto_alg = crypto_alg; p->ike_ts.integ_alg = integ_alg; p->ike_ts.dh_type = dh_type; p->ike_ts.crypto_key_size = crypto_key_size; return 0; } clib_error_t * ikev2_set_profile_esp_transforms (vlib_main_t * vm, u8 * name, ikev2_transform_encr_type_t crypto_alg, ikev2_transform_integ_type_t integ_alg, ikev2_transform_dh_type_t dh_type, u32 crypto_key_size) { 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; } p->esp_ts.crypto_alg = crypto_alg; p->esp_ts.integ_alg = integ_alg; p->esp_ts.dh_type = dh_type; p->esp_ts.crypto_key_size = crypto_key_size; return 0; } clib_error_t * ikev2_set_profile_tunnel_interface (vlib_main_t * vm, u8 * name, u32 sw_if_index) { 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; } p->tun_itf = sw_if_index; return 0; } vnet_api_error_t ikev2_set_profile_ipsec_udp_port (vlib_main_t * vm, u8 * name, u16 port, u8 is_set) { ikev2_profile_t *p = ikev2_profile_index_by_name (name); ikev2_main_t *km = &ikev2_main; vnet_api_error_t rv = 0; uword *v; if (!p) return VNET_API_ERROR_INVALID_VALUE; if (is_set) { if (p->dst_port != IPSEC_UDP_PORT_NONE) return VNET_API_ERROR_VALUE_EXIST; rv = ikev2_register_udp_port (p, port); } else { v = hash_get (km->udp_ports, port); if (!v) return VNET_API_ERROR_IKE_NO_PORT; if (p->dst_port == IPSEC_UDP_PORT_NONE) return VNET_API_ERROR_INVALID_VALUE; ikev2_unregister_udp_port (p); } return rv; } clib_error_t * ikev2_set_profile_udp_encap (vlib_main_t * vm, u8 * name) { ikev2_profile_t *p = ikev2_profile_index_by_name (name); clib_error_t *r; if (!p) { r = clib_error_return (0, "unknown profile %v", name); return r; } p->udp_encap = 1; return 0; } clib_error_t * ikev2_set_profile_sa_lifetime (vlib_main_t * vm, u8 * name, u64 lifetime, u32 jitter, u32 handover, u64 maxdata) { 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; } p->lifetime = lifetime; p->lifetime_jitter = jitter; p->handover = handover; p->lifetime_maxdata = maxdata; return 0; } clib_error_t * ikev2_initiate_sa_init (vlib_main_t * vm, u8 * name) { ikev2_profile_t *p; clib_error_t *r; ip4_main_t *im = &ip4_main; ikev2_main_t *km = &ikev2_main; p = ikev2_profile_index_by_name (name); if (!p) { r = clib_error_return (0, "unknown profile %v", name); return r; } if (p->responder.sw_if_index == ~0 || p->responder.ip4.data_u32 == 0) { r = clib_error_return (0, "responder not set for profile %v", name); return r; } /* Create the Initiator Request */ { ike_header_t *ike0; u32 bi0 = 0; ip_lookup_main_t *lm = &im->lookup_main; u32 if_add_index0; int len = sizeof (ike_header_t); /* Get own iface IP */ if_add_index0 = lm->if_address_pool_index_by_sw_if_index[p->responder.sw_if_index]; ip_interface_address_t *if_add = pool_elt_at_index (lm->if_address_pool, if_add_index0); ip4_address_t *if_ip = ip_interface_address_get_address (lm, if_add); bi0 = ikev2_get_new_ike_header_buff (vm, &ike0); /* Prepare the SA and the IKE payload */ ikev2_sa_t sa; clib_memset (&sa, 0, sizeof (ikev2_sa_t)); ikev2_payload_chain_t *chain = 0; ikev2_payload_new_chain (chain); /* Build the IKE proposal payload */ ikev2_sa_proposal_t *proposals = 0; ikev2_set_initiator_proposals (vm, &sa, &p->ike_ts, &proposals, 1); proposals[0].proposal_num = 1; proposals[0].protocol_id = IKEV2_PROTOCOL_IKE; /* Add and then cleanup proposal data */ ikev2_payload_add_sa (chain, proposals); ikev2_sa_free_proposal_vector (&proposals); sa.is_initiator = 1; sa.profile_index = km->profiles - p; sa.is_profile_index_set = 1; sa.state = IKEV2_STATE_SA_INIT; sa.tun_itf = p->tun_itf; sa.udp_encap = p->udp_encap; sa.dst_port = p->dst_port; sa.is_tun_itf_set = 1; sa.initial_contact = 1; ikev2_generate_sa_init_data (&sa); ikev2_payload_add_ke (chain, sa.dh_group, sa.i_dh_data); ikev2_payload_add_nonce (chain, sa.i_nonce); /* Build the child SA proposal */ vec_resize (sa.childs, 1); ikev2_set_initiator_proposals (vm, &sa, &p->esp_ts, &sa.childs[0].i_proposals, 0); sa.childs[0].i_proposals[0].proposal_num = 1; sa.childs[0].i_proposals[0].protocol_id = IKEV2_PROTOCOL_ESP; RAND_bytes ((u8 *) & sa.childs[0].i_proposals[0].spi, sizeof (sa.childs[0].i_proposals[0].spi)); /* Add NAT detection notification messages (mandatory) */ u8 nat_detection_source[8 + 8 + 4 + 2]; u8 *nat_detection_sha1 = vec_new (u8, 20); u64 tmpspi = clib_host_to_net_u64 (sa.ispi); clib_memcpy_fast (&nat_detection_source[0], &tmpspi, sizeof (tmpspi)); tmpspi = clib_host_to_net_u64 (sa.rspi); clib_memcpy_fast (&nat_detection_source[8], &tmpspi, sizeof (tmpspi)); u16 tmpport = clib_host_to_net_u16 (500); clib_memcpy_fast (&nat_detection_source[8 + 8 + 4], &tmpport, sizeof (tmpport)); u32 tmpip = clib_host_to_net_u32 (if_ip->as_u32); clib_memcpy_fast (&nat_detection_source[8 + 8], &tmpip, sizeof (tmpip)); SHA1 (nat_detection_source, sizeof (nat_detection_source), nat_detection_sha1); ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_NAT_DETECTION_SOURCE_IP, nat_detection_sha1); tmpip = clib_host_to_net_u32 (p->responder.ip4.as_u32); clib_memcpy_fast (&nat_detection_source[8 + 8], &tmpip, sizeof (tmpip)); SHA1 (nat_detection_source, sizeof (nat_detection_source), nat_detection_sha1); ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_NAT_DETECTION_DESTINATION_IP, nat_detection_sha1); vec_free (nat_detection_sha1); u8 *sig_hash_algo = vec_new (u8, 8); u64 tmpsig = clib_host_to_net_u64 (0x0001000200030004); clib_memcpy_fast (sig_hash_algo, &tmpsig, sizeof (tmpsig)); ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_SIGNATURE_HASH_ALGORITHMS, sig_hash_algo); vec_free (sig_hash_algo); /* Buffer update and boilerplate */ len += vec_len (chain->data); ike0->nextpayload = chain->first_payload_type; ike0->length = clib_host_to_net_u32 (len); clib_memcpy_fast (ike0->payload, chain->data, vec_len (chain->data)); ikev2_payload_destroy_chain (chain); ike0->version = IKE_VERSION_2; ike0->flags = IKEV2_HDR_FLAG_INITIATOR; ike0->exchange = IKEV2_EXCHANGE_SA_INIT; ike0->ispi = sa.ispi; ike0->rspi = 0; ike0->msgid = 0; /* 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, ike0, len); /* add data to the SA then add it to the pool */ sa.iaddr.as_u32 = if_ip->as_u32; sa.raddr.as_u32 = p->responder.ip4.as_u32; sa.i_id.type = p->loc_id.type; sa.i_id.data = vec_dup (p->loc_id.data); sa.i_auth.method = p->auth.method; sa.i_auth.hex = p->auth.hex; sa.i_auth.data = vec_dup (p->auth.data); vec_add (sa.childs[0].tsi, &p->loc_ts, 1); vec_add (sa.childs[0].tsr, &p->rem_ts, 1); ikev2_initial_contact_cleanup (&sa); /* add SA to the pool */ ikev2_sa_t *sa0 = 0; pool_get (km->sais, sa0); clib_memcpy_fast (sa0, &sa, sizeof (*sa0)); hash_set (km->sa_by_ispi, sa0->ispi, sa0 - km->sais); ikev2_send_ike (vm, if_ip, &p->responder.ip4, bi0, len); ikev2_elog_exchange ("ispi %lx rspi %lx IKEV2_EXCHANGE_SA_INIT sent to " "%d.%d.%d.%d", clib_host_to_net_u64 (sa0->ispi), 0, p->responder.ip4.as_u32); } return 0; } static void ikev2_delete_child_sa_internal (vlib_main_t * vm, ikev2_sa_t * sa, ikev2_child_sa_t * csa) { /* Create the Initiator notification for child SA removal */ ikev2_main_t *km = &ikev2_main; ike_header_t *ike0; u32 bi0 = 0; int len; bi0 = ikev2_get_new_ike_header_buff (vm, &ike0); ike0->exchange = IKEV2_EXCHANGE_INFORMATIONAL; ike0->ispi = clib_host_to_net_u64 (sa->ispi); ike0->rspi = clib_host_to_net_u64 (sa->rspi); vec_resize (sa->del, 1); sa->del->protocol_id = IKEV2_PROTOCOL_ESP; sa->del->spi = csa->i_proposals->spi; ike0->msgid = clib_host_to_net_u32 (sa->last_init_msg_id + 1); sa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid); len = ikev2_generate_message (sa, ike0, 0); ikev2_send_ike (vm, &sa->iaddr, &sa->raddr, bi0, len); /* delete local child SA */ ikev2_delete_tunnel_interface (km->vnet_main, sa, csa); ikev2_sa_del_child_sa (sa, csa); } clib_error_t * ikev2_initiate_delete_child_sa (vlib_main_t * vm, u32 ispi) { clib_error_t *r; ikev2_main_t *km = &ikev2_main; ikev2_main_per_thread_data_t *tkm; ikev2_sa_t *fsa = 0; ikev2_child_sa_t *fchild = 0; /* Search for the child SA */ vec_foreach (tkm, km->per_thread_data) { ikev2_sa_t *sa; if (fchild) break; /* *INDENT-OFF* */ pool_foreach (sa, tkm->sas, ({ fchild = ikev2_sa_get_child(sa, ispi, IKEV2_PROTOCOL_ESP, 1); if (fchild) { fsa = sa; break; } })); /* *INDENT-ON* */ } if (!fchild || !fsa) { r = clib_error_return (0, "Child SA not found"); return r; } else { ikev2_delete_child_sa_internal (vm, fsa, fchild); } return 0; } clib_error_t * ikev2_initiate_delete_ike_sa (vlib_main_t * vm, u64 ispi) { clib_error_t *r; ikev2_main_t *km = &ikev2_main; ikev2_main_per_thread_data_t *tkm; ikev2_sa_t *fsa = 0; ikev2_main_per_thread_data_t *ftkm = 0; /* Search for the IKE SA */ vec_foreach (tkm, km->per_thread_data) { ikev2_sa_t *sa; if (fsa) break; /* *INDENT-OFF* */ pool_foreach (sa, tkm->sas, ({ if (sa->ispi == ispi) { fsa = sa; ftkm = tkm; break; } })); /* *INDENT-ON* */ } if (!fsa) { r = clib_error_return (0, "IKE SA not found"); return r; } /* Create the Initiator notification for IKE SA removal */ { ike_header_t *ike0; u32 bi0 = 0; int len; bi0 = ikev2_get_new_ike_header_buff (vm, &ike0); ike0->exchange = IKEV2_EXCHANGE_INFORMATIONAL; ike0->ispi = clib_host_to_net_u64 (fsa->ispi); ike0->rspi = clib_host_to_net_u64 (fsa->rspi); vec_resize (fsa->del, 1); fsa->del->protocol_id = IKEV2_PROTOCOL_IKE; fsa->del->spi = ispi; ike0->msgid = clib_host_to_net_u32 (fsa->last_init_msg_id + 1); fsa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid); len = ikev2_generate_message (fsa, ike0, 0); ikev2_send_ike (vm, &fsa->iaddr, &fsa->raddr, bi0, len); } /* delete local SA */ ikev2_child_sa_t *c; vec_foreach (c, fsa->childs) { ikev2_delete_tunnel_interface (km->vnet_main, fsa, c); ikev2_sa_del_child_sa (fsa, c); } ikev2_sa_free_all_vec (fsa); uword *p = hash_get (ftkm->sa_by_rspi, fsa->rspi); if (p) { hash_unset (ftkm->sa_by_rspi, fsa->rspi); pool_put (ftkm->sas, fsa); } return 0; } static void ikev2_rekey_child_sa_internal (vlib_main_t * vm, ikev2_sa_t * sa, ikev2_child_sa_t * csa) { /* Create the Initiator request for create child SA */ ike_header_t *ike0; u32 bi0 = 0; int len; bi0 = ikev2_get_new_ike_header_buff (vm, &ike0); ike0->version = IKE_VERSION_2; ike0->flags = IKEV2_HDR_FLAG_INITIATOR; ike0->exchange = IKEV2_EXCHANGE_CREATE_CHILD_SA; ike0->ispi = clib_host_to_net_u64 (sa->ispi); ike0->rspi = clib_host_to_net_u64 (sa->rspi); ike0->msgid = clib_host_to_net_u32 (sa->last_init_msg_id + 1); sa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid); ikev2_rekey_t *rekey; vec_add2 (sa->rekey, rekey, 1); ikev2_sa_proposal_t *proposals = vec_dup (csa->i_proposals); /*need new ispi */ RAND_bytes ((u8 *) & proposals[0].spi, sizeof (proposals[0].spi)); rekey->spi = proposals[0].spi; rekey->ispi = csa->i_proposals->spi; len = ikev2_generate_message (sa, ike0, proposals); ikev2_send_ike (vm, &sa->iaddr, &sa->raddr, bi0, len); vec_free (proposals); } clib_error_t * ikev2_initiate_rekey_child_sa (vlib_main_t * vm, u32 ispi) { clib_error_t *r; ikev2_main_t *km = &ikev2_main; ikev2_main_per_thread_data_t *tkm; ikev2_sa_t *fsa = 0; ikev2_child_sa_t *fchild = 0; /* Search for the child SA */ vec_foreach (tkm, km->per_thread_data) { ikev2_sa_t *sa; if (fchild) break; /* *INDENT-OFF* */ pool_foreach (sa, tkm->sas, ({ fchild = ikev2_sa_get_child(sa, ispi, IKEV2_PROTOCOL_ESP, 1); if (fchild) { fsa = sa; break; } })); /* *INDENT-ON* */ } if (!fchild || !fsa) { r = clib_error_return (0, "Child SA not found"); return r; } else { ikev2_rekey_child_sa_internal (vm, fsa, fchild); } return 0; } clib_error_t * ikev2_init (vlib_main_t * vm) { ikev2_main_t *km = &ikev2_main; vlib_thread_main_t *tm = vlib_get_thread_main (); int thread_id; clib_memset (km, 0, sizeof (ikev2_main_t)); km->vnet_main = vnet_get_main (); km->vlib_main = vm; ikev2_crypto_init (km); mhash_init_vec_string (&km->profile_index_by_name, sizeof (uword)); vec_validate_aligned (km->per_thread_data, tm->n_vlib_mains - 1, CLIB_CACHE_LINE_BYTES); for (thread_id = 0; thread_id < tm->n_vlib_mains - 1; thread_id++) { km->per_thread_data[thread_id].sa_by_rspi = hash_create (0, sizeof (uword)); } km->sa_by_ispi = hash_create (0, sizeof (uword)); km->sw_if_indices = hash_create (0, 0); km->udp_ports = hash_create (0, sizeof (uword)); udp_register_dst_port (vm, 500, ikev2_node.index, 1); ikev2_cli_reference (); km->log_level = IKEV2_LOG_ERROR; km->log_class = vlib_log_register_class ("ikev2", 0); return 0; } /* *INDENT-OFF* */ VLIB_INIT_FUNCTION (ikev2_init) = { .runs_after = VLIB_INITS("ipsec_init"), }; /* *INDENT-ON* */ static u8 ikev2_mngr_process_child_sa (ikev2_sa_t * sa, ikev2_child_sa_t * csa, u8 del_old_ids) { ikev2_main_t *km = &ikev2_main; ikev2_profile_t *p = 0; vlib_main_t *vm = km->vlib_main; f64 now = vlib_time_now (vm); u8 res = 0; if (sa->is_profile_index_set) p = pool_elt_at_index (km->profiles, sa->profile_index); if (sa->is_initiator && p && csa->time_to_expiration && now > csa->time_to_expiration) { if (!csa->is_expired || csa->rekey_retries > 0) { ikev2_rekey_child_sa_internal (vm, sa, csa); csa->time_to_expiration = now + p->handover; csa->is_expired = 1; if (csa->rekey_retries == 0) { csa->rekey_retries = 5; } else if (csa->rekey_retries > 0) { csa->rekey_retries--; ikev2_log_debug ("Rekeying Child SA 0x%x, retries left %d", csa->i_proposals->spi, csa->rekey_retries); if (csa->rekey_retries == 0) { csa->rekey_retries = -1; } } res |= 1; } else { csa->time_to_expiration = 0; ikev2_delete_child_sa_internal (vm, sa, csa); res |= 1; } } if (del_old_ids) { ipip_tunnel_t *ipip = NULL; u32 sw_if_index = sa->is_tun_itf_set ? sa->tun_itf : ~0; if (~0 == sw_if_index) { ip46_address_t local_ip; ip46_address_t remote_ip; if (sa->is_initiator) { ip46_address_set_ip4 (&local_ip, &sa->iaddr); ip46_address_set_ip4 (&remote_ip, &sa->raddr); } else { ip46_address_set_ip4 (&local_ip, &sa->raddr); ip46_address_set_ip4 (&remote_ip, &sa->iaddr); } /* *INDENT-OFF* */ ipip_tunnel_key_t key = { .src = local_ip, .dst = remote_ip, .transport = IPIP_TRANSPORT_IP4, .fib_index = 0, }; /* *INDENT-ON* */ ipip = ipip_tunnel_db_find (&key); if (ipip) sw_if_index = ipip->sw_if_index; else return res; } u32 *sas_in = NULL; vec_add1 (sas_in, csa->remote_sa_id); ipsec_tun_protect_update (sw_if_index, NULL, csa->local_sa_id, sas_in); ipsec_sa_unlock_id (ikev2_flip_alternate_sa_bit (csa->remote_sa_id)); } return res; } int ikev2_set_log_level (ikev2_log_level_t log_level) { ikev2_main_t *km = &ikev2_main; if (log_level >= IKEV2_LOG_MAX) { ikev2_log_error ("unknown logging level %d", log_level); return -1; } km->log_level = log_level; return 0; } static void ikev2_mngr_process_ipsec_sa (ipsec_sa_t * ipsec_sa) { ikev2_main_t *km = &ikev2_main; vlib_main_t *vm = km->vlib_main; ikev2_main_per_thread_data_t *tkm; ikev2_sa_t *fsa = 0; ikev2_profile_t *p = 0; ikev2_child_sa_t *fchild = 0; f64 now = vlib_time_now (vm); vlib_counter_t counts; /* Search for the SA and child SA */ vec_foreach (tkm, km->per_thread_data) { ikev2_sa_t *sa; if (fchild) break; /* *INDENT-OFF* */ pool_foreach (sa, tkm->sas, ({ fchild = ikev2_sa_get_child(sa, ipsec_sa->spi, IKEV2_PROTOCOL_ESP, 1); if (fchild) { fsa = sa; break; } })); /* *INDENT-ON* */ } vlib_get_combined_counter (&ipsec_sa_counters, ipsec_sa->stat_index, &counts); if (fsa && fsa->is_profile_index_set) p = pool_elt_at_index (km->profiles, fsa->profile_index); if (fchild && p && p->lifetime_maxdata) { if (!fchild->is_expired && counts.bytes > p->lifetime_maxdata) { fchild->time_to_expiration = now; } } } static void ikev2_process_pending_sa_init (ikev2_main_t * km) { u32 sai; u64 ispi; ikev2_sa_t *sa; /* *INDENT-OFF* */ hash_foreach (ispi, sai, km->sa_by_ispi, ({ sa = pool_elt_at_index (km->sais, sai); u32 bi0; if (vlib_buffer_alloc (km->vlib_main, &bi0, 1) != 1) return; vlib_buffer_t * b = vlib_get_buffer (km->vlib_main, bi0); clib_memcpy_fast (vlib_buffer_get_current (b), sa->last_sa_init_req_packet_data, vec_len (sa->last_sa_init_req_packet_data)); ikev2_send_ike (km->vlib_main, &sa->iaddr, &sa->raddr, bi0, vec_len (sa->last_sa_init_req_packet_data)); })); /* *INDENT-ON* */ } static vlib_node_registration_t ikev2_mngr_process_node; static uword ikev2_mngr_process_fn (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { ikev2_main_t *km = &ikev2_main; ipsec_main_t *im = &ipsec_main; while (1) { u8 req_sent = 0; vlib_process_wait_for_event_or_clock (vm, 1); vlib_process_get_events (vm, NULL); /* process ike child sas */ ikev2_main_per_thread_data_t *tkm; vec_foreach (tkm, km->per_thread_data) { ikev2_sa_t *sa; /* *INDENT-OFF* */ pool_foreach (sa, tkm->sas, ({ ikev2_child_sa_t *c; u8 del_old_ids = 0; if (sa->old_remote_id_present && 0 > sa->old_id_expiration) { sa->old_remote_id_present = 0; del_old_ids = 1; } else sa->old_id_expiration -= 1; vec_foreach (c, sa->childs) { req_sent |= ikev2_mngr_process_child_sa(sa, c, del_old_ids); } })); /* *INDENT-ON* */ } /* process ipsec sas */ ipsec_sa_t *sa; /* *INDENT-OFF* */ pool_foreach (sa, im->sad, ({ ikev2_mngr_process_ipsec_sa(sa); })); /* *INDENT-ON* */ ikev2_process_pending_sa_init (km); if (req_sent) { vlib_process_wait_for_event_or_clock (vm, 5); vlib_process_get_events (vm, NULL); req_sent = 0; } } return 0; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ikev2_mngr_process_node, static) = { .function = ikev2_mngr_process_fn, .type = VLIB_NODE_TYPE_PROCESS, .name = "ikev2-manager-process", }; VLIB_PLUGIN_REGISTER () = { .version = VPP_BUILD_VER, .description = "Internet Key Exchange (IKEv2) Protocol", }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */