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gerrit.nordix.org / fdio / vpp / 8f6c1dda355b6e4d00dc4e41e65a25e1fd1507ee / . / src / vnet / ipsec / ikev2.c
blob: 3d5c0f766cfba9cf45dabdef6220e0c3e69468cc [file] [log] [blame]
/*
* 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 <vppinfra/random.h>
#include <vnet/udp/udp.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/ikev2.h>
#include <vnet/ipsec/ikev2_priv.h>
#include <openssl/sha.h>
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; \
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_fast (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,
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_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);
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)
{
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;
}
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->profile = sai->profile;
sa->i_id.type = sai->i_id.type;
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);
#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)
{
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 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;
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_fast (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_fast (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_fast (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_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;
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_fast (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_fast (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_fast (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_fast (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 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;
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);
sa->rspi = clib_net_to_host_u64 (ike->rspi);
/* 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
{
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;
}
}
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->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))
{
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 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;
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;
}
/* 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 */
{
clib_warning ("received payload SA, len %u", plen - sizeof (*ikep));
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));
clib_warning ("received payload IDi, len %u id_type %u",
plen - sizeof (*id), id->id_type);
}
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));
clib_warning ("received payload IDr 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;
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));
}
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 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_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
{
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 (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)
{
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, 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))
{
tsi = vec_dup(ts);
break;
}
}
vec_foreach(ts, sa->childs[0].tsr)
{
if (ikev2_ts_cmp(p_tsr, 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, 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* */
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);
}
}
else
{
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))
{
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);
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 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;
ikev2_sa_proposal_t *proposals;
u8 encr_type = 0;
u8 integ_type = 0;
if (!child->r_proposals)
{
ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
return 1;
}
clib_memset (&a, 0, sizeof (a));
a.is_add = 1;
if (sa->is_initiator)
{
a.local_ip.ip4.as_u32 = sa->iaddr.as_u32;
a.remote_ip.ip4.as_u32 = sa->raddr.as_u32;
proposals = child->i_proposals;
a.local_spi = child->r_proposals[0].spi;
a.remote_spi = child->i_proposals[0].spi;
}
else
{
a.local_ip.ip4.as_u32 = sa->raddr.as_u32;
a.remote_ip.ip4.as_u32 = sa->iaddr.as_u32;
proposals = child->r_proposals;
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 (proposals, IKEV2_TRANSFORM_TYPE_ESN);
if (tr)
a.esn = tr->esn_type;
else
a.esn = 0;
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
{
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 (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;
}
ikev2_calc_child_keys (sa, child);
u8 *loc_ckey, *rem_ckey, *loc_ikey, *rem_ikey;
if (sa->is_initiator)
{
loc_ikey = child->sk_ai;
rem_ikey = child->sk_ar;
loc_ckey = child->sk_ei;
rem_ckey = child->sk_er;
}
else
{
loc_ikey = child->sk_ar;
rem_ikey = child->sk_ai;
loc_ckey = child->sk_er;
rem_ckey = child->sk_ei;
}
a.integ_alg = integ_type;
a.local_integ_key_len = vec_len (loc_ikey);
clib_memcpy_fast (a.local_integ_key, loc_ikey, a.local_integ_key_len);
a.remote_integ_key_len = vec_len (rem_ikey);
clib_memcpy_fast (a.remote_integ_key, rem_ikey, a.remote_integ_key_len);
a.crypto_alg = encr_type;
a.local_crypto_key_len = vec_len (loc_ckey);
clib_memcpy_fast (a.local_crypto_key, loc_ckey, a.local_crypto_key_len);
a.remote_crypto_key_len = vec_len (rem_ckey);
clib_memcpy_fast (a.remote_crypto_key, rem_ckey, a.remote_crypto_key_len);
if (sa->profile && sa->profile->lifetime)
{
child->time_to_expiration = vlib_time_now (vnm->vlib_main)
+ sa->profile->lifetime;
if (sa->profile->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 % sa->profile->lifetime_jitter);
}
}
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 (sa->is_initiator)
{
if (!vec_len (child->i_proposals))
return 0;
a.is_add = 0;
a.local_ip.ip4.as_u32 = sa->iaddr.as_u32;
a.remote_ip.ip4.as_u32 = sa->raddr.as_u32;
a.local_spi = child->r_proposals[0].spi;
a.remote_spi = child->i_proposals[0].spi;
}
else
{
if (!vec_len (child->r_proposals))
return 0;
a.is_add = 0;
a.local_ip.ip4.as_u32 = sa->raddr.as_u32;
a.remote_ip.ip4.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_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);
}
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 (&notify, 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,
&notify);
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));
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_fast (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 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, sa0,
&sa0->childs[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)
{
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);
}
if (sa0->is_initiator)
{
vec_del1 (sa0->rekey, 0);
}
else
{
len = ikev2_generate_message (sa0, ike0, 0);
}
}
}
}
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;
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;
}
/* 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)
{
clib_warning
("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 */
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;
}
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->responder.sw_if_index = ~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);
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_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 = p;
sa.state = IKEV2_STATE_SA_INIT;
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;
/* 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);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
clib_memcpy_fast (sa.i_auth.key, p->auth.key,
EVP_PKEY_size (p->auth.key));
#else
sa.i_auth.key = vec_dup (p->auth.key);
#endif
vec_add (sa.childs[0].tsi, &p->loc_ts, 1);
vec_add (sa.childs[0].tsr, &p->rem_ts, 1);
/* 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);
}
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;
clib_error_t *error;
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 (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));
}
km->sa_by_ispi = 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;
}
static u8
ikev2_mngr_process_child_sa (ikev2_sa_t * sa, ikev2_child_sa_t * csa)
{
ikev2_main_t *km = &ikev2_main;
vlib_main_t *vm = km->vlib_main;
f64 now = vlib_time_now (vm);
u8 res = 0;
if (sa->is_initiator && sa->profile && 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 + sa->profile->handover;
csa->is_expired = 1;
if (csa->rekey_retries == 0)
{
csa->rekey_retries = 5;
}
else if (csa->rekey_retries > 0)
{
csa->rekey_retries--;
clib_warning ("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;
}
}
return res;
}
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_child_sa_t *fchild = 0;
f64 now = vlib_time_now (vm);
/* 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* */
}
if (fchild && fsa && fsa->profile && fsa->profile->lifetime_maxdata)
{
if (!fchild->is_expired
&& ipsec_sa->total_data_size > fsa->profile->lifetime_maxdata)
{
fchild->time_to_expiration = now;
}
}
}
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;
vec_foreach (c, sa->childs)
{
req_sent |= ikev2_mngr_process_child_sa(sa, c);
}
}));
/* *INDENT-ON* */
}
/* process ipsec sas */
ipsec_sa_t *sa;
/* *INDENT-OFF* */
pool_foreach (sa, im->sad, ({
ikev2_mngr_process_ipsec_sa(sa);
}));
/* *INDENT-ON* */
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",
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/