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EAP-TTLS: Key derivation per draft-ietf-emu-tls-eap-types-00

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Use the TLS-Exporter with the label and context as defined in
draft-ietf-emu-tls-eap-types-00 when deriving keys for EAP-TTLS with TLS
1.3.

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
This commit is contained in:
Alexander Clouter
2020-10-16 09:49:38 +01:00
committed by Sarvesh Bodakhe
parent 0d90484018
commit 42e37285e5
1 changed files with 17 additions and 4 deletions
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21
components/wpa_supplicant/src/eap_peer/eap_ttls.c
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@@ -217,11 +217,24 @@ static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code,
static int eap_ttls_v0_derive_key(struct eap_sm *sm, static int eap_ttls_v0_derive_key(struct eap_sm *sm,
struct eap_ttls_data *data) struct eap_ttls_data *data)
{ {
const char *label;
const u8 eap_tls13_context[1] = { EAP_TYPE_TTLS };
const u8 *context = NULL;
size_t context_len = 0;
if (data->ssl.tls_v13) {
label = "EXPORTER_EAP_TLS_Key_Material";
context = eap_tls13_context;
context_len = sizeof(eap_tls13_context);
} else {
label = "ttls keying material";
}
eap_ttls_free_key(data); eap_ttls_free_key(data);
data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, label,
"ttls keying material", context, context_len,
NULL, 0, EAP_TLS_KEY_LEN +
EAP_TLS_KEY_LEN); EAP_EMSK_LEN);
if (!data->key_data) { if (!data->key_data) {
wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive key"); wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive key");
return -1; return -1;