static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
{
enum tncs_process_res res;
res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
wpabuf_len(inbuf));
switch (res) {
case TNCCS_RECOMMENDATION_ALLOW:
wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
eap_tnc_set_state(data, RECOMMENDATION);
data->recommendation = ALLOW;
break;
case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
eap_tnc_set_state(data, RECOMMENDATION);
data->recommendation = NO_RECOMMENDATION;
break;
case TNCCS_RECOMMENDATION_ISOLATE:
wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
eap_tnc_set_state(data, RECOMMENDATION);
data->recommendation = ISOLATE;
break;
case TNCCS_RECOMMENDATION_NO_ACCESS:
wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
eap_tnc_set_state(data, RECOMMENDATION);
data->recommendation = NO_ACCESS;
break;
case TNCCS_PROCESS_ERROR:
wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
eap_tnc_set_state(data, FAIL);
break;
default:
break;
}
}
static struct wpabuf * eap_tnc_build_msg(struct eap_tnc_data *data, u8 id)
{
struct wpabuf *req;
u8 flags;
size_t send_len, plen;
wpa_printf(MSG_DEBUG, "EAP-TNC: Generating Request");
flags = EAP_TNC_VERSION;
send_len = wpabuf_len(data->out_buf) - data->out_used;
if (1 + send_len > data->fragment_size) {
send_len = data->fragment_size - 1;
flags |= EAP_TNC_FLAGS_MORE_FRAGMENTS;
if (data->out_used == 0) {
flags |= EAP_TNC_FLAGS_LENGTH_INCLUDED;
send_len -= 4;
}
}
plen = 1 + send_len;
if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
plen += 4;
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, plen,
EAP_CODE_REQUEST, id);
if (req == NULL)
return NULL;
wpabuf_put_u8(req, flags); /* Flags */
if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
wpabuf_put_be32(req, wpabuf_len(data->out_buf));
wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
send_len);
data->out_used += send_len;
if (data->out_used == wpabuf_len(data->out_buf)) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
"(message sent completely)",
(unsigned long) send_len);
wpabuf_free(data->out_buf);
data->out_buf = NULL;
data->out_used = 0;
if (data->was_fail)
eap_tnc_set_state(data, FAIL);
else if (data->was_done)
eap_tnc_set_state(data, DONE);
} else {
wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
"(%lu more to send)", (unsigned long) send_len,
(unsigned long) wpabuf_len(data->out_buf) -
data->out_used);
if (data->state == FAIL)
data->was_fail = 1;
else if (data->state == DONE)
data->was_done = 1;
eap_tnc_set_state(data, WAIT_FRAG_ACK);
}
return req;
}
static struct wpabuf * eap_tnc_build_start(struct eap_sm *sm,
struct eap_tnc_data *data, u8 id)
{
struct wpabuf *req;
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, EAP_CODE_REQUEST,
id);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory for "
"request");
eap_tnc_set_state(data, FAIL);
return NULL;
}
wpabuf_put_u8(req, EAP_TNC_FLAGS_START | EAP_TNC_VERSION);
eap_tnc_set_state(data, CONTINUE);
return req;
}
static struct wpabuf * eap_tnc_build_recommendation(struct eap_sm *sm,
struct eap_tnc_data *data)
{
switch (data->recommendation) {
case ALLOW:
eap_tnc_set_state(data, DONE);
break;
case ISOLATE:
eap_tnc_set_state(data, FAIL);
/* TODO: support assignment to a different VLAN */
break;
case NO_ACCESS:
eap_tnc_set_state(data, FAIL);
break;
case NO_RECOMMENDATION:
eap_tnc_set_state(data, DONE);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-TNC: Unknown recommendation");
return NULL;
}
return eap_tnc_build(sm, data);
}
static int eap_tnc_process_cont(struct eap_tnc_data *data,
const u8 *buf, size_t len)
{
/* Process continuation of a pending message */
if (len > wpabuf_tailroom(data->in_buf)) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
eap_tnc_set_state(data, FAIL);
return -1;
}
wpabuf_put_data(data->in_buf, buf, len);
wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
"bytes more", (unsigned long) len,
(unsigned long) wpabuf_tailroom(data->in_buf));
return 0;
}
static void * eap_tnc_init(struct eap_sm *sm)
{
struct eap_tnc_data *data;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
eap_tnc_set_state(data, START);
data->tncs = tncs_init();
if (data->tncs == NULL) {
os_free(data);
return NULL;
}
data->fragment_size = 1300;
return data;
}
static void eap_tnc_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_tnc_data *data = priv;
const u8 *pos, *end;
size_t len;
u8 flags;
u32 message_length = 0;
struct wpabuf tmpbuf;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
if (pos == NULL)
return; /* Should not happen; message already verified */
end = pos + len;
if (len == 1 && (data->state == DONE || data->state == FAIL)) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
"message");
return;
}
if (len == 0) {
/* fragment ack */
flags = 0;
} else
flags = *pos++;
if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
if (end - pos < 4) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
eap_tnc_set_state(data, FAIL);
return;
}
message_length = WPA_GET_BE32(pos);
pos += 4;
if (message_length < (u32) (end - pos) ||
message_length > 75000) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
"Length (%d; %ld remaining in this msg)",
message_length, (long) (end - pos));
eap_tnc_set_state(data, FAIL);
return;
}
}
wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
"Message Length %u", flags, message_length);
if (data->state == WAIT_FRAG_ACK) {
if (len > 1) {
wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
"in WAIT_FRAG_ACK state");
eap_tnc_set_state(data, FAIL);
return;
}
wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
eap_tnc_set_state(data, CONTINUE);
return;
}
if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
eap_tnc_set_state(data, FAIL);
return;
}
if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
if (eap_tnc_process_fragment(data, flags, message_length,
pos, end - pos) < 0)
eap_tnc_set_state(data, FAIL);
else
eap_tnc_set_state(data, FRAG_ACK);
return;
} else if (data->state == FRAG_ACK) {
wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
eap_tnc_set_state(data, CONTINUE);
}
if (data->in_buf == NULL) {
/* Wrap unfragmented messages as wpabuf without extra copy */
wpabuf_set(&tmpbuf, pos, end - pos);
data->in_buf = &tmpbuf;
}
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
tncs_process(data, data->in_buf);
if (data->in_buf != &tmpbuf)
wpabuf_free(data->in_buf);
data->in_buf = NULL;
}
