static void eap_sim_process_challenge(struct eap_sm *sm,
struct eap_sim_data *data,
struct wpabuf *respData,
struct eap_sim_attrs *attr)
{
const u8 *identity;
size_t identity_len;
if (attr->mac == NULL ||
eap_sim_verify_mac(data->k_aut, respData, attr->mac,
(u8 *) data->sres,
data->num_chal * EAP_SIM_SRES_LEN)) {
wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
"did not include valid AT_MAC");
eap_sim_state(data, FAILURE);
return;
}
wpa_printf(MSG_DEBUG, "EAP-SIM: Challenge response includes the "
"correct AT_MAC");
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
data->use_result_ind = 1;
data->notification = EAP_SIM_SUCCESS;
eap_sim_state(data, NOTIFICATION);
} else
eap_sim_state(data, SUCCESS);
identity = eap_sim_db_get_permanent(sm->eap_sim_db_priv, sm->identity,
sm->identity_len, &identity_len);
if (identity == NULL) {
identity = sm->identity;
identity_len = sm->identity_len;
}
if (data->next_pseudonym) {
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
identity_len,
data->next_pseudonym);
data->next_pseudonym = NULL;
}
if (data->next_reauth_id) {
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
identity_len,
data->next_reauth_id, data->counter + 1,
data->mk);
data->next_reauth_id = NULL;
}
}
static void eap_aka_process_reauth(struct eap_sm *sm,
struct eap_aka_data *data,
struct wpabuf *respData,
struct eap_sim_attrs *attr)
{
struct eap_sim_attrs eattr;
u8 *decrypted = NULL;
const u8 *identity, *id2;
size_t identity_len, id2_len;
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Reauthentication");
if (attr->mac == NULL ||
eap_aka_verify_mac(data, respData, attr->mac, data->nonce_s,
EAP_SIM_NONCE_S_LEN)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message "
"did not include valid AT_MAC");
goto fail;
}
if (attr->encr_data == NULL || attr->iv == NULL) {
wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
"message did not include encrypted data");
goto fail;
}
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
attr->encr_data_len, attr->iv, &eattr,
0);
if (decrypted == NULL) {
wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
"data from reauthentication message");
goto fail;
}
if (eattr.counter != data->counter) {
wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message "
"used incorrect counter %u, expected %u",
eattr.counter, data->counter);
goto fail;
}
os_free(decrypted);
decrypted = NULL;
wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response includes "
"the correct AT_MAC");
if (eattr.counter_too_small) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response "
"included AT_COUNTER_TOO_SMALL - starting full "
"authentication");
eap_aka_determine_identity(sm, data, 0, 1);
return;
}
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
data->use_result_ind = 1;
data->notification = EAP_SIM_SUCCESS;
eap_aka_state(data, NOTIFICATION);
} else
eap_aka_state(data, SUCCESS);
if (data->reauth) {
identity = data->reauth->identity;
identity_len = data->reauth->identity_len;
} else {
identity = sm->identity;
identity_len = sm->identity_len;
}
id2 = eap_sim_db_get_permanent(sm->eap_sim_db_priv, identity,
identity_len, &id2_len);
if (id2) {
identity = id2;
identity_len = id2_len;
}
if (data->next_pseudonym) {
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
identity_len, data->next_pseudonym);
data->next_pseudonym = NULL;
}
if (data->next_reauth_id) {
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
#ifdef EAP_SERVER_AKA_PRIME
eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv,
identity,
identity_len,
data->next_reauth_id,
data->counter + 1,
data->k_encr, data->k_aut,
data->k_re);
#endif /* EAP_SERVER_AKA_PRIME */
} else {
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
identity_len,
data->next_reauth_id,
data->counter + 1,
data->mk);
}
data->next_reauth_id = NULL;
} else {
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
data->reauth = NULL;
}
return;
fail:
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
data->reauth = NULL;
os_free(decrypted);
}
static void eap_aka_process_challenge(struct eap_sm *sm,
struct eap_aka_data *data,
struct wpabuf *respData,
struct eap_sim_attrs *attr)
{
const u8 *identity;
size_t identity_len;
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Challenge");
#ifdef EAP_SERVER_AKA_PRIME
#if 0
/* KDF negotiation; to be enabled only after more than one KDF is
* supported */
if (data->eap_method == EAP_TYPE_AKA_PRIME &&
attr->kdf_count == 1 && attr->mac == NULL) {
if (attr->kdf[0] != EAP_AKA_PRIME_KDF) {
wpa_printf(MSG_WARNING, "EAP-AKA': Peer selected "
"unknown KDF");
data->notification =
EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
return;
}
data->kdf = attr->kdf[0];
/* Allow negotiation to continue with the selected KDF by
* sending another Challenge message */
wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
return;
}
#endif
#endif /* EAP_SERVER_AKA_PRIME */
if (attr->checkcode &&
eap_aka_verify_checkcode(data, attr->checkcode,
attr->checkcode_len)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
"message");
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
return;
}
if (attr->mac == NULL ||
eap_aka_verify_mac(data, respData, attr->mac, NULL, 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
"did not include valid AT_MAC");
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
return;
}
/*
* AT_RES is padded, so verify that there is enough room for RES and
* that the RES length in bits matches with the expected RES.
*/
if (attr->res == NULL || attr->res_len < data->res_len ||
attr->res_len_bits != data->res_len * 8 ||
os_memcmp(attr->res, data->res, data->res_len) != 0) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message did not "
"include valid AT_RES (attr len=%lu, res len=%lu "
"bits, expected %lu bits)",
(unsigned long) attr->res_len,
(unsigned long) attr->res_len_bits,
(unsigned long) data->res_len * 8);
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
return;
}
wpa_printf(MSG_DEBUG, "EAP-AKA: Challenge response includes the "
"correct AT_MAC");
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
data->use_result_ind = 1;
data->notification = EAP_SIM_SUCCESS;
eap_aka_state(data, NOTIFICATION);
} else
eap_aka_state(data, SUCCESS);
identity = eap_sim_db_get_permanent(sm->eap_sim_db_priv, sm->identity,
sm->identity_len, &identity_len);
if (identity == NULL) {
identity = sm->identity;
identity_len = sm->identity_len;
}
if (data->next_pseudonym) {
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
identity_len,
data->next_pseudonym);
data->next_pseudonym = NULL;
}
if (data->next_reauth_id) {
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
#ifdef EAP_SERVER_AKA_PRIME
eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv,
identity,
identity_len,
data->next_reauth_id,
data->counter + 1,
data->k_encr, data->k_aut,
data->k_re);
#endif /* EAP_SERVER_AKA_PRIME */
} else {
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
identity_len,
data->next_reauth_id,
data->counter + 1,
data->mk);
}
data->next_reauth_id = NULL;
}
}
static void eap_sim_process_reauth(struct eap_sm *sm,
struct eap_sim_data *data,
struct wpabuf *respData,
struct eap_sim_attrs *attr)
{
struct eap_sim_attrs eattr;
u8 *decrypted = NULL;
const u8 *identity, *id2;
size_t identity_len, id2_len;
if (attr->mac == NULL ||
eap_sim_verify_mac(data->k_aut, respData, attr->mac, data->nonce_s,
EAP_SIM_NONCE_S_LEN)) {
wpa_printf(MSG_WARNING, "EAP-SIM: Re-authentication message "
"did not include valid AT_MAC");
goto fail;
}
if (attr->encr_data == NULL || attr->iv == NULL) {
wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
"message did not include encrypted data");
goto fail;
}
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
attr->encr_data_len, attr->iv, &eattr,
0);
if (decrypted == NULL) {
wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
"data from reauthentication message");
goto fail;
}
if (eattr.counter != data->counter) {
wpa_printf(MSG_WARNING, "EAP-SIM: Re-authentication message "
"used incorrect counter %u, expected %u",
eattr.counter, data->counter);
goto fail;
}
os_free(decrypted);
decrypted = NULL;
wpa_printf(MSG_DEBUG, "EAP-SIM: Re-authentication response includes "
"the correct AT_MAC");
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
data->use_result_ind = 1;
data->notification = EAP_SIM_SUCCESS;
eap_sim_state(data, NOTIFICATION);
} else
eap_sim_state(data, SUCCESS);
if (data->reauth) {
identity = data->reauth->identity;
identity_len = data->reauth->identity_len;
} else {
identity = sm->identity;
identity_len = sm->identity_len;
}
id2 = eap_sim_db_get_permanent(sm->eap_sim_db_priv, identity,
identity_len, &id2_len);
if (id2) {
identity = id2;
identity_len = id2_len;
}
if (data->next_pseudonym) {
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
identity_len, data->next_pseudonym);
data->next_pseudonym = NULL;
}
if (data->next_reauth_id) {
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
identity_len, data->next_reauth_id,
data->counter + 1, data->mk);
data->next_reauth_id = NULL;
} else {
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
data->reauth = NULL;
}
return;
fail:
eap_sim_state(data, FAILURE);
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
data->reauth = NULL;
os_free(decrypted);
}
