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eap-peap: add version validation

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Tim Kourt 2018-01-23 15:29:14 -08:00 committed by Denis Kenzior
parent ba8857d2f4
commit 1d1bbb83eb
1 changed files with 43 additions and 0 deletions
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43
src/eap-peap.c
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@ -39,6 +39,11 @@ enum peap_version {
PEAP_VERSION_NOT_NEGOTIATED = 0x08, PEAP_VERSION_NOT_NEGOTIATED = 0x08,
}; };
enum peap_flag {
/* Reserved = 0x00, */
PEAP_FLAG_S = 0x20,
};
struct eap_peap_state { struct eap_peap_state {
enum peap_version version; enum peap_version version;
@ -62,9 +67,47 @@ static void eap_peap_free(struct eap_state *eap)
l_free(peap); l_free(peap);
} }
static bool eap_peap_validate_version(struct eap_state *eap,
uint8_t flags_version)
{
struct eap_peap_state *peap = eap_get_data(eap);
enum peap_version version_proposed = flags_version & PEAP_VERSION_MASK;
if (peap->version == version_proposed)
return true;
if (!(flags_version & PEAP_FLAG_S) ||
peap->version != PEAP_VERSION_NOT_NEGOTIATED)
return false;
if (version_proposed < __PEAP_VERSION_MAX_SUPPORTED)
peap->version = version_proposed;
else
peap->version = __PEAP_VERSION_MAX_SUPPORTED;
return true;
}
static void eap_peap_handle_request(struct eap_state *eap, static void eap_peap_handle_request(struct eap_state *eap,
const uint8_t *pkt, size_t len) const uint8_t *pkt, size_t len)
{ {
uint8_t flags_version;
if (len < 1) {
l_error("EAP-PEAP request too short");
goto error;
}
flags_version = pkt[0];
if (!eap_peap_validate_version(eap, flags_version)) {
l_error("EAP-PEAP version negotiation failed");
goto error;
}
return;
error:
eap_method_error(eap); eap_method_error(eap);
} }