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eap-wsc: Add basic logic to send M1 messages

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This commit is contained in:
Denis Kenzior 2016-08-24 21:48:55 -05:00
parent c2cb35b4c9
commit 097e775659
1 changed files with 72 additions and 3 deletions
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75
src/eap-wsc.c
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@ -36,6 +36,28 @@
#define EAP_WSC_OFFSET 12
/* WSC v2.0.5, Section 7.7.1 */
enum wsc_op {
WSC_OP_START = 0x01,
WSC_OP_ACK = 0x02,
WSC_OP_NACK = 0x03,
WSC_OP_MSG = 0x04,
WSC_OP_DONE = 0x05,
WSC_OP_FRAG_ACK = 0x06,
};
/* WSC v2.0.5, Section 7.7.1 */
enum wsc_flag {
WSC_FLAG_MF = 0x01,
WSC_FLAG_LF = 0x02,
};
enum state {
STATE_EXPECT_START = 0,
STATE_EXPECT_M2,
STATE_EXPECT_M4,
};
static struct l_key *dh5_generator;
static struct l_key *dh5_prime;
@ -47,6 +69,7 @@ struct eap_wsc_state {
char *device_password;
uint8_t e_snonce1[16];
uint8_t e_snonce2[16];
enum state state;
};
static inline void eap_wsc_state_set_sent_pdu(struct eap_wsc_state *wsc,
@ -88,13 +111,59 @@ static void eap_wsc_remove(struct eap_state *eap)
l_free(wsc);
}
static void eap_wsc_send_response(struct eap_state *eap,
uint8_t *pdu, size_t len)
{
struct eap_wsc_state *wsc = eap_get_data(eap);
uint8_t buf[len + 14];
buf[12] = WSC_OP_MSG;
buf[13] = 0;
memcpy(buf + 14, pdu, len);
eap_send_response(eap, EAP_TYPE_EXPANDED, buf, len + 14);
eap_wsc_state_set_sent_pdu(wsc, pdu, len);
}
static void eap_wsc_handle_request(struct eap_state *eap,
const uint8_t *pkt, size_t len)
{
uint8_t buf[256];
struct eap_wsc_state *wsc = eap_get_data(eap);
uint8_t op;
uint8_t flags;
uint8_t *pdu;
size_t pdu_len;
/* TODO: Fill in response */
eap_send_response(eap, EAP_TYPE_EXPANDED, buf, 256);
if (len < 2)
return;
op = pkt[0];
flags = pkt[1];
/* TODO: Handle fragmentation */
if (flags != 0)
return;
switch (wsc->state) {
case STATE_EXPECT_START:
if (op != WSC_OP_START)
return;
if (len != 2)
return;
pdu = wsc_build_m1(wsc->m1, &pdu_len);
if (!pdu)
return;
eap_wsc_send_response(eap, pdu, pdu_len);
wsc->state = STATE_EXPECT_M2;
break;
case STATE_EXPECT_M2:
case STATE_EXPECT_M4:
break;
}
}
static bool load_hexencoded(struct l_settings *settings, const char *key,