+static int eap_aka_check_identity_reauth(struct eap_sm *sm,
+ struct eap_aka_data *data,
+ const char *username)
+{
+ if (data->eap_method == EAP_TYPE_AKA_PRIME &&
+ username[0] != EAP_AKA_PRIME_REAUTH_ID_PREFIX)
+ return 0;
+ if (data->eap_method == EAP_TYPE_AKA &&
+ username[0] != EAP_AKA_REAUTH_ID_PREFIX)
+ return 0;
+
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Reauth username '%s'", username);
+ data->reauth = eap_sim_db_get_reauth_entry(sm->eap_sim_db_priv,
+ username);
+ if (data->reauth == NULL) {
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown reauth identity - "
+ "request full auth identity");
+ /* Remain in IDENTITY state for another round */
+ return 0;
+ }
+
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Using fast re-authentication");
+ os_strlcpy(data->permanent, data->reauth->permanent,
+ sizeof(data->permanent));
+ data->counter = data->reauth->counter;
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ os_memcpy(data->k_encr, data->reauth->k_encr,
+ EAP_SIM_K_ENCR_LEN);
+ os_memcpy(data->k_aut, data->reauth->k_aut,
+ EAP_AKA_PRIME_K_AUT_LEN);
+ os_memcpy(data->k_re, data->reauth->k_re,
+ EAP_AKA_PRIME_K_RE_LEN);
+ } else {
+ os_memcpy(data->mk, data->reauth->mk, EAP_SIM_MK_LEN);
+ }
+
+ eap_aka_state(data, REAUTH);
+ return 1;
+}
+
+
+static void eap_aka_check_identity(struct eap_sm *sm,
+ struct eap_aka_data *data)
+{
+ char *username;
+
+ /* Check if we already know the identity from EAP-Response/Identity */
+
+ username = sim_get_username(sm->identity, sm->identity_len);
+ if (username == NULL)
+ return;
+
+ if (eap_aka_check_identity_reauth(sm, data, username) > 0) {
+ os_free(username);
+ /*
+ * Since re-auth username was recognized, skip AKA/Identity
+ * exchange.
+ */
+ return;
+ }
+
+ if ((data->eap_method == EAP_TYPE_AKA_PRIME &&
+ username[0] == EAP_AKA_PRIME_PSEUDONYM_PREFIX) ||
+ (data->eap_method == EAP_TYPE_AKA &&
+ username[0] == EAP_AKA_PSEUDONYM_PREFIX)) {
+ const char *permanent;
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Pseudonym username '%s'",
+ username);
+ permanent = eap_sim_db_get_permanent(
+ sm->eap_sim_db_priv, username);
+ if (permanent == NULL) {
+ os_free(username);
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown pseudonym "
+ "identity - request permanent identity");
+ /* Remain in IDENTITY state for another round */
+ return;
+ }
+ os_strlcpy(data->permanent, permanent,
+ sizeof(data->permanent));
+ /*
+ * Since pseudonym username was recognized, skip AKA/Identity
+ * exchange.
+ */
+ eap_aka_fullauth(sm, data);
+ }
+
+ os_free(username);
+}
+
+