static void eap_ikev2_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_ikev2_data *data = priv;
const u8 *start, *pos, *end;
size_t len;
u8 flags;
u32 message_length = 0;
struct wpabuf tmpbuf;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, respData,
&len);
if (pos == NULL)
return; /* Should not happen; message already verified */
start = pos;
end = start + len;
if (len == 0) {
/* fragment ack */
flags = 0;
} else
flags = *pos++;
if (eap_ikev2_process_icv(data, respData, flags, pos, &end,
data->state == WAIT_FRAG_ACK && len == 0) < 0)
{
eap_ikev2_state(data, FAIL);
return;
}
if (flags & IKEV2_FLAGS_LENGTH_INCLUDED) {
if (end - pos < 4) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Message underflow");
eap_ikev2_state(data, FAIL);
return;
}
message_length = WPA_GET_BE32(pos);
pos += 4;
if (message_length < (u32) (end - pos)) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Invalid Message "
"Length (%d; %ld remaining in this msg)",
message_length, (long) (end - pos));
eap_ikev2_state(data, FAIL);
return;
}
}
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received packet: Flags 0x%x "
"Message Length %u", flags, message_length);
if (data->state == WAIT_FRAG_ACK) {
if (len != 0) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unexpected payload "
"in WAIT_FRAG_ACK state");
eap_ikev2_state(data, FAIL);
return;
}
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Fragment acknowledged");
eap_ikev2_state(data, MSG);
return;
}
if (data->in_buf && eap_ikev2_process_cont(data, pos, end - pos) < 0) {
eap_ikev2_state(data, FAIL);
return;
}
if (flags & IKEV2_FLAGS_MORE_FRAGMENTS) {
if (eap_ikev2_process_fragment(data, flags, message_length,
pos, end - pos) < 0)
eap_ikev2_state(data, FAIL);
else
eap_ikev2_state(data, FRAG_ACK);
return;
} else if (data->state == FRAG_ACK) {
wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
data->state = MSG;
}
if (data->in_buf == NULL) {
/* Wrap unfragmented messages as wpabuf without extra copy */
wpabuf_set(&tmpbuf, pos, end - pos);
data->in_buf = &tmpbuf;
}
if (ikev2_initiator_process(&data->ikev2, data->in_buf) < 0) {
if (data->in_buf == &tmpbuf)
data->in_buf = NULL;
eap_ikev2_state(data, FAIL);
return;
}
switch (data->ikev2.state) {
case SA_AUTH:
/* SA_INIT was sent out, so message have to be
* integrity protected from now on. */
data->keys_ready = 1;
break;
case IKEV2_DONE:
if (data->state == FAIL)
break;
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Authentication completed "
"successfully");
if (eap_ikev2_server_keymat(data))
break;
eap_ikev2_state(data, DONE);
break;
default:
break;
}
if (data->in_buf != &tmpbuf)
wpabuf_free(data->in_buf);
data->in_buf = NULL;
}
static struct wpabuf * eap_ikev2_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct eap_ikev2_data *data = priv;
const u8 *start, *pos, *end;
size_t len;
u8 flags, id;
u32 message_length = 0;
struct wpabuf tmpbuf;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, reqData, &len);
if (pos == NULL) {
ret->ignore = TRUE;
return NULL;
}
id = eap_get_id(reqData);
start = pos;
end = start + len;
if (len == 0)
flags = 0; /* fragment ack */
else
flags = *pos++;
if (eap_ikev2_process_icv(data, reqData, flags, pos, &end) < 0) {
ret->ignore = TRUE;
return NULL;
}
if (flags & IKEV2_FLAGS_LENGTH_INCLUDED) {
if (end - pos < 4) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Message underflow");
ret->ignore = TRUE;
return NULL;
}
message_length = WPA_GET_BE32(pos);
pos += 4;
if (message_length < (u32) (end - pos)) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Invalid Message "
"Length (%d; %ld remaining in this msg)",
message_length, (long) (end - pos));
ret->ignore = TRUE;
return NULL;
}
}
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received packet: Flags 0x%x "
"Message Length %u", flags, message_length);
if (data->state == WAIT_FRAG_ACK) {
#ifdef CCNS_PL
if (len > 1) /* Empty Flags field included in ACK */
#else /* CCNS_PL */
if (len != 0)
#endif /* CCNS_PL */
{
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unexpected payload "
"in WAIT_FRAG_ACK state");
ret->ignore = TRUE;
return NULL;
}
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Fragment acknowledged");
eap_ikev2_state(data, PROC_MSG);
return eap_ikev2_build_msg(data, ret, id);
}
if (data->in_buf && eap_ikev2_process_cont(data, pos, end - pos) < 0) {
ret->ignore = TRUE;
return NULL;
}
if (flags & IKEV2_FLAGS_MORE_FRAGMENTS) {
return eap_ikev2_process_fragment(data, ret, id, flags,
message_length, pos,
end - pos);
}
if (data->in_buf == NULL) {
/* Wrap unfragmented messages as wpabuf without extra copy */
wpabuf_set(&tmpbuf, pos, end - pos);
data->in_buf = &tmpbuf;
}
if (ikev2_responder_process(&data->ikev2, data->in_buf) < 0) {
if (data->in_buf == &tmpbuf)
data->in_buf = NULL;
eap_ikev2_state(data, FAIL);
return NULL;
}
if (data->in_buf != &tmpbuf)
wpabuf_free(data->in_buf);
data->in_buf = NULL;
if (data->out_buf == NULL) {
data->out_buf = ikev2_responder_build(&data->ikev2);
if (data->out_buf == NULL) {
wpa_printf(MSG_DEBUG, "EAP-IKEV2: Failed to generate "
"IKEv2 message");
return NULL;
}
data->out_used = 0;
}
eap_ikev2_state(data, PROC_MSG);
return eap_ikev2_build_msg(data, ret, id);
}
