diff options
Diffstat (limited to 'vpp/vnet/vnet/ipsec/ikev2.c')
| -rw-r--r-- | vpp/vnet/vnet/ipsec/ikev2.c | 2186 |
1 files changed, 2186 insertions, 0 deletions
diff --git a/vpp/vnet/vnet/ipsec/ikev2.c b/vpp/vnet/vnet/ipsec/ikev2.c new file mode 100644 index 00000000..5a6c3674 --- /dev/null +++ b/vpp/vnet/vnet/ipsec/ikev2.c @@ -0,0 +1,2186 @@ +/* + * 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 <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/pg/pg.h> +#include <vppinfra/error.h> +#include <vnet/ip/udp.h> +#include <vnet/ipsec/ipsec.h> +#include <vnet/ipsec/ikev2.h> +#include <vnet/ipsec/ikev2_priv.h> + +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; \ + 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; +} + +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 (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; + u32 cpu_index = os_get_cpu_number (); + uword *p; + + ikev2_sa_free_all_vec (sa); + + p = hash_get (km->per_thread_data[cpu_index].sa_by_rspi, sa->rspi); + if (p) + { + hash_unset (km->per_thread_data[cpu_index].sa_by_rspi, sa->rspi); + pool_put (km->per_thread_data[cpu_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) + { + 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); + clib_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); + clib_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); + clib_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); + clib_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); + clib_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); + clib_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); + clib_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); + + int pos = 0; + + /* SK_ei */ + child->sk_ei = vec_new (u8, ctr_encr->key_len); + clib_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); + clib_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); + clib_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); + clib_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 = 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) + { + 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; + u32 cpu_index = os_get_cpu_number (); + + if (!sa->initial_contact) + return; + + /* find old IKE SAs with the same authenticated identity */ + /* *INDENT-OFF* */ + pool_foreach (tmp, km->per_thread_data[cpu_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[cpu_index].sas); + })); + /* *INDENT-ON* */ + + for (i = 0; i < vec_len (delete); i++) + { + tmp = pool_elt_at_index (km->per_thread_data[cpu_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; + 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) + { + clib_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; + + /* *INDENT-OFF* */ + 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; + })); + /* *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)) + { + 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); + + /* *INDENT-OFF* */ + 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); + })); + /* *INDENT-ON* */ + + 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; + u8 encr_type = 0; + + if (!child->r_proposals) + { + ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN); + return 1; + } + + memset (&a, 0, sizeof (a)); + 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; + } + + ikev2_calc_child_keys (sa, child); + + a.integ_alg = IPSEC_INTEG_ALG_SHA1_96; + a.local_integ_key_len = vec_len (child->sk_ar); + clib_memcpy (a.local_integ_key, child->sk_ar, a.local_integ_key_len); + a.remote_integ_key_len = vec_len (child->sk_ai); + clib_memcpy (a.remote_integ_key, child->sk_ai, a.remote_integ_key_len); + + a.crypto_alg = encr_type; + a.local_crypto_key_len = vec_len (child->sk_er); + clib_memcpy (a.local_crypto_key, child->sk_er, a.local_crypto_key_len); + a.remote_crypto_key_len = vec_len (child->sk_ei); + clib_memcpy (a.remote_crypto_key, child->sk_ei, a.remote_crypto_key_len); + + ipsec_add_del_tunnel_if (&a); + + 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; + + ipsec_add_del_tunnel_if (&a); + return 0; +} + +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); + clib_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); + + clib_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; + u32 cpu_index = os_get_cpu_number (); + + /* *INDENT-OFF* */ + pool_foreach (sa, km->per_thread_data[cpu_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(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; + } + } + })); + /* *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 (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; + u32 cpu_index = os_get_cpu_number (); + + 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; + 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->per_thread_data[cpu_index].sas, sa0); + clib_memcpy (sa0, &sa, sizeof (*sa0)); + hash_set (km->per_thread_data[cpu_index].sa_by_rspi, + sa0->rspi, + sa0 - km->per_thread_data[cpu_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[cpu_index].sa_by_rspi, + clib_net_to_host_u64 (ike0->rspi)); + if (p) + { + sa0 = pool_elt_at_index (km->per_thread_data[cpu_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, sa0, + &sa0->childs[0]); + } + len = ikev2_generate_resp (sa0, ike0); + } + } + else if (ike0->exchange == IKEV2_EXCHANGE_INFORMATIONAL) + { + uword *p; + p = hash_get (km->per_thread_data[cpu_index].sa_by_rspi, + clib_net_to_host_u64 (ike0->rspi)); + if (p) + { + sa0 = pool_elt_at_index (km->per_thread_data[cpu_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); + 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->per_thread_data[cpu_index].sa_by_rspi, + clib_net_to_host_u64 (ike0->rspi)); + if (p) + { + sa0 = pool_elt_at_index (km->per_thread_data[cpu_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) + { + 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); + } + + 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); + } + /* 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* */ + + +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) + { + 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_init (vlib_main_t * vm) +{ + ikev2_main_t *km = &ikev2_main; + clib_error_t *error; + vlib_thread_main_t *tm = vlib_get_thread_main (); + int thread_id; + + 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 (km->per_thread_data, tm->n_vlib_mains - 1); + 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)); + } + + if ((error = vlib_call_init_function (vm, ikev2_cli_init))) + return error; + + udp_register_dst_port (vm, 500, ikev2_node.index, 1); + + return 0; +} + + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |