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EAP peer: Clear keying material on deinit

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Reduce the amount of time keying material (MSK, EMSK, temporary private
data) remains in memory in EAP methods. This provides additional
protection should there be any issues that could expose process memory
to external observers.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
2014-06-29 21:16:30 +03:00
committed by Sarvesh Bodakhe
parent bb16734aa9
commit f4d7329ae6
5 changed files with 49 additions and 13 deletions
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13
components/wpa_supplicant/src/eap_peer/eap_tls.c
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@@ -60,13 +60,22 @@ static void * eap_tls_init(struct eap_sm *sm)
}
static void eap_tls_free_key(struct eap_tls_data *data)
{
if (data->key_data) {
bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
data->key_data = NULL;
}
}
static void eap_tls_deinit(struct eap_sm *sm, void *priv)
{
struct eap_tls_data *data = priv;
if (data == NULL)
return;
eap_peer_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
eap_tls_free_key(data);
os_free(data->session_id);
wpabuf_free(data->pending_resp);
os_free(data);
@@ -135,7 +144,7 @@ static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
ret->decision = DECISION_UNCOND_SUCC;
}
os_free(data->key_data);
eap_tls_free_key(data);
data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, label,
EAP_TLS_KEY_LEN +
EAP_EMSK_LEN);