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EAP-EKE: Use os_memcmp_const() for hash/password comparisons

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This makes the implementation less likely to provide useful timing
information to potential attackers from comparisons of information
received from a remote device and private material known only by the
authorized devices.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-06-29 20:20:28 +03:00
parent dfb5608139
commit dddf7bbd4e
3 changed files with 5 additions and 5 deletions
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4
src/eap_server/eap_server_eke.c
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@ -635,8 +635,8 @@ static void eap_eke_process_confirm(struct eap_sm *sm,
return;
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth_p, data->sess.prf_len);
if (os_memcmp(auth_p, payload + data->sess.pnonce_len,
data->sess.prf_len) != 0) {
if (os_memcmp_const(auth_p, payload + data->sess.pnonce_len,
data->sess.prf_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Auth_P does not match");
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
return;