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eap-wsc: Send M3

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This commit is contained in:
Denis Kenzior 2016-08-29 22:10:19 -05:00
parent 397a7d18c2
commit 05c230c46a
1 changed files with 73 additions and 0 deletions
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73
src/eap-wsc.c
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@ -191,6 +191,78 @@ static void eap_wsc_send_nack(struct eap_state *eap,
return;
}
static void eap_wsc_send_m3(struct eap_state *eap,
const uint8_t *m2_pdu, size_t m2_len,
const struct wsc_m2 *m2)
{
struct eap_wsc_state *wsc = eap_get_data(eap);
uint8_t psk1[16];
uint8_t psk2[16];
size_t len;
size_t len_half1;
struct wsc_m3 m3;
struct iovec iov[4];
uint8_t *pdu;
size_t pdu_len;
len = strlen(wsc->device_password);
/* WSC 2.0.5, Section 7.4:
* In case the UTF8 representation of the DevicePassword length is an
* odd number (N), the first half of DevicePassword will have length
* of N/2+1 and the second half of the DevicePassword will have length
* of N/2.
*/
len_half1 = len / 2;
if ((len % 2) == 1)
len_half1 += 1;
l_checksum_update(wsc->hmac_auth_key, wsc->device_password, len_half1);
l_checksum_get_digest(wsc->hmac_auth_key, psk1, sizeof(psk1));
l_checksum_update(wsc->hmac_auth_key, wsc->device_password + len_half1,
len / 2);
l_checksum_get_digest(wsc->hmac_auth_key, psk2, sizeof(psk2));
m3.version2 = true;
memcpy(m3.registrar_nonce, m2->registrar_nonce,
sizeof(m3.registrar_nonce));
/* WSC 2.0.5, Section 7.4:
* The Enrollee creates two 128-bit secret nonces, E-S1, E-S2 and then
* computes:
* E-Hash1 = HMACAuthKey(E-S1 || PSK1 || PKE || PKR)
* E-Hash2 = HMACAuthKey(E-S2 || PSK2 || PKE || PKR)
*/
iov[0].iov_base = wsc->e_snonce1;
iov[0].iov_len = sizeof(wsc->e_snonce1);
iov[1].iov_base = psk1;
iov[1].iov_len = sizeof(psk1);
iov[2].iov_base = wsc->m1->public_key;
iov[2].iov_len = sizeof(wsc->m1->public_key);
iov[3].iov_base = (void *) m2->public_key;
iov[3].iov_len = sizeof(m2->public_key);
l_checksum_updatev(wsc->hmac_auth_key, iov, 4);
l_checksum_get_digest(wsc->hmac_auth_key,
m3.e_hash1, sizeof(m3.e_hash1));
iov[0].iov_base = wsc->e_snonce2;
iov[0].iov_len = sizeof(wsc->e_snonce2);
iov[1].iov_base = psk2;
iov[1].iov_len = sizeof(psk2);
l_checksum_updatev(wsc->hmac_auth_key, iov, 4);
l_checksum_get_digest(wsc->hmac_auth_key,
m3.e_hash2, sizeof(m3.e_hash2));
pdu = wsc_build_m3(&m3, &pdu_len);
if (!pdu)
return;
authenticator_put(wsc, m2_pdu, m2_len, pdu, pdu_len);
eap_wsc_send_response(eap, pdu, pdu_len);
wsc->state = STATE_EXPECT_M4;
}
static void eap_wsc_handle_m2(struct eap_state *eap,
const uint8_t *pdu, size_t len)
{
@ -261,6 +333,7 @@ static void eap_wsc_handle_m2(struct eap_state *eap,
}
/* Everything checks out, lets build M3 */
eap_wsc_send_m3(eap, pdu, len, &m2);
}
static void eap_wsc_handle_request(struct eap_state *eap,