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eap-wsc: Add util to verify RX frame Authenticator

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This commit is contained in:
Denis Kenzior 2016-08-29 12:10:10 -05:00
parent 097e775659
commit 33b0034678
1 changed files with 22 additions and 0 deletions
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22
src/eap-wsc.c
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@ -70,6 +70,7 @@ struct eap_wsc_state {
uint8_t e_snonce1[16];
uint8_t e_snonce2[16];
enum state state;
struct l_checksum *hmac_auth_key;
};
static inline void eap_wsc_state_set_sent_pdu(struct eap_wsc_state *wsc,
@ -80,6 +81,26 @@ static inline void eap_wsc_state_set_sent_pdu(struct eap_wsc_state *wsc,
wsc->sent_len = len;
}
static inline bool authenticator_check(struct eap_wsc_state *wsc,
const uint8_t *pdu, size_t len)
{
uint8_t authenticator[8];
struct iovec iov[2];
iov[0].iov_base = wsc->sent_pdu;
iov[0].iov_len = wsc->sent_len;
iov[1].iov_base = (void *) pdu;
iov[1].iov_len = len - 12;
l_checksum_updatev(wsc->hmac_auth_key, iov, 2);
l_checksum_get_digest(wsc->hmac_auth_key, authenticator, 8);
/* Authenticator is the last 8 bytes of the message */
if (memcmp(authenticator, pdu + len - 8, 8))
return false;
return true;
}
static int eap_wsc_probe(struct eap_state *eap, const char *name)
{
struct eap_wsc_state *wsc;
@ -107,6 +128,7 @@ static void eap_wsc_remove(struct eap_state *eap)
wsc->sent_pdu = 0;
wsc->sent_len = 0;
l_checksum_free(wsc->hmac_auth_key);
l_free(wsc->m1);
l_free(wsc);
}