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* hostapd / EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
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* Copyright (c) 2005-2008, Jouni Malinen <j@w1.fi>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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#include "eap_server/eap_i.h"
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#include "eap_common/eap_sim_common.h"
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#include "eap_server/eap_sim_db.h"
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u8 mk[EAP_SIM_MK_LEN];
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u8 nonce_s[EAP_SIM_NONCE_S_LEN];
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u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
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u8 k_encr[EAP_SIM_K_ENCR_LEN];
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u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
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u8 msk[EAP_SIM_KEYING_DATA_LEN];
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u8 emsk[EAP_EMSK_LEN];
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u8 rand[EAP_AKA_RAND_LEN];
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u8 autn[EAP_AKA_AUTN_LEN];
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u8 ck[EAP_AKA_CK_LEN];
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u8 ik[EAP_AKA_IK_LEN];
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u8 res[EAP_AKA_RES_MAX_LEN];
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IDENTITY, CHALLENGE, REAUTH, NOTIFICATION, SUCCESS, FAILURE
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struct eap_sim_reauth *reauth;
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int auts_reported; /* whether the current AUTS has been reported to the
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struct wpabuf *id_msgs;
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size_t network_name_len;
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static void eap_aka_determine_identity(struct eap_sm *sm,
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struct eap_aka_data *data,
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int before_identity, int after_reauth);
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static const char * eap_aka_state_txt(int state)
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return "NOTIFICATION";
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static void eap_aka_state(struct eap_aka_data *data, int state)
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wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
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eap_aka_state_txt(data->state),
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eap_aka_state_txt(state));
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static void * eap_aka_init(struct eap_sm *sm)
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struct eap_aka_data *data;
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if (sm->eap_sim_db_priv == NULL) {
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wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured");
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data = os_zalloc(sizeof(*data));
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data->eap_method = EAP_TYPE_AKA;
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data->state = IDENTITY;
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eap_aka_determine_identity(sm, data, 1, 0);
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data->pending_id = -1;
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static void * eap_aka_prime_init(struct eap_sm *sm)
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struct eap_aka_data *data;
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/* TODO: make ANID configurable; see 3GPP TS 24.302 */
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char *network_name = "WLAN";
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if (sm->eap_sim_db_priv == NULL) {
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wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured");
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data = os_zalloc(sizeof(*data));
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data->eap_method = EAP_TYPE_AKA_PRIME;
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data->network_name = os_malloc(os_strlen(network_name));
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if (data->network_name == NULL) {
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data->network_name_len = os_strlen(network_name);
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os_memcpy(data->network_name, network_name, data->network_name_len);
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data->state = IDENTITY;
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eap_aka_determine_identity(sm, data, 1, 0);
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data->pending_id = -1;
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#endif /* EAP_AKA_PRIME */
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static void eap_aka_reset(struct eap_sm *sm, void *priv)
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struct eap_aka_data *data = priv;
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os_free(data->next_pseudonym);
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os_free(data->next_reauth_id);
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wpabuf_free(data->id_msgs);
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os_free(data->network_name);
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static int eap_aka_add_id_msg(struct eap_aka_data *data,
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const struct wpabuf *msg)
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if (data->id_msgs == NULL) {
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data->id_msgs = wpabuf_dup(msg);
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return data->id_msgs == NULL ? -1 : 0;
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if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
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wpabuf_put_buf(data->id_msgs, msg);
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static void eap_aka_add_checkcode(struct eap_aka_data *data,
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struct eap_sim_msg *msg)
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u8 hash[SHA256_MAC_LEN];
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wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
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if (data->id_msgs == NULL) {
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* No EAP-AKA/Identity packets were exchanged - send empty
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eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
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/* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
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addr = wpabuf_head(data->id_msgs);
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len = wpabuf_len(data->id_msgs);
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wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
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if (data->eap_method == EAP_TYPE_AKA_PRIME)
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sha256_vector(1, &addr, &len, hash);
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sha1_vector(1, &addr, &len, hash);
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eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
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data->eap_method == EAP_TYPE_AKA_PRIME ?
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EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
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static int eap_aka_verify_checkcode(struct eap_aka_data *data,
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const u8 *checkcode, size_t checkcode_len)
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u8 hash[SHA256_MAC_LEN];
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if (checkcode == NULL)
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if (data->id_msgs == NULL) {
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if (checkcode_len != 0) {
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wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer "
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"indicates that AKA/Identity messages were "
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"used, but they were not");
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hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
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EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
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if (checkcode_len != hash_len) {
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wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer indicates "
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"that AKA/Identity message were not used, but they "
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/* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
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addr = wpabuf_head(data->id_msgs);
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len = wpabuf_len(data->id_msgs);
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if (data->eap_method == EAP_TYPE_AKA_PRIME)
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sha256_vector(1, &addr, &len, hash);
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sha1_vector(1, &addr, &len, hash);
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if (os_memcmp(hash, checkcode, hash_len) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
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static struct wpabuf * eap_aka_build_identity(struct eap_sm *sm,
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struct eap_aka_data *data, u8 id)
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struct eap_sim_msg *msg;
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wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Identity");
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msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
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EAP_AKA_SUBTYPE_IDENTITY);
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if (eap_sim_db_identity_known(sm->eap_sim_db_priv, sm->identity,
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wpa_printf(MSG_DEBUG, " AT_PERMANENT_ID_REQ");
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eap_sim_msg_add(msg, EAP_SIM_AT_PERMANENT_ID_REQ, 0, NULL, 0);
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* RFC 4187, Chap. 4.1.4 recommends that identity from EAP is
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* ignored and the AKA/Identity is used to request the
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wpa_printf(MSG_DEBUG, " AT_ANY_ID_REQ");
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eap_sim_msg_add(msg, EAP_SIM_AT_ANY_ID_REQ, 0, NULL, 0);
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buf = eap_sim_msg_finish(msg, NULL, NULL, 0);
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if (eap_aka_add_id_msg(data, buf) < 0) {
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data->pending_id = id;
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static int eap_aka_build_encr(struct eap_sm *sm, struct eap_aka_data *data,
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struct eap_sim_msg *msg, u16 counter,
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os_free(data->next_pseudonym);
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data->next_pseudonym =
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eap_sim_db_get_next_pseudonym(sm->eap_sim_db_priv, 1);
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os_free(data->next_reauth_id);
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if (data->counter <= EAP_AKA_MAX_FAST_REAUTHS) {
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data->next_reauth_id =
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eap_sim_db_get_next_reauth_id(sm->eap_sim_db_priv, 1);
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wpa_printf(MSG_DEBUG, "EAP-AKA: Max fast re-authentication "
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"count exceeded - force full authentication");
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data->next_reauth_id = NULL;
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if (data->next_pseudonym == NULL && data->next_reauth_id == NULL &&
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counter == 0 && nonce_s == NULL)
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wpa_printf(MSG_DEBUG, " AT_IV");
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wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
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eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
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wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", counter);
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eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
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wpa_printf(MSG_DEBUG, " *AT_NONCE_S");
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eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_S, 0, nonce_s,
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EAP_SIM_NONCE_S_LEN);
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if (data->next_pseudonym) {
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wpa_printf(MSG_DEBUG, " *AT_NEXT_PSEUDONYM (%s)",
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data->next_pseudonym);
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eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_PSEUDONYM,
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os_strlen(data->next_pseudonym),
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(u8 *) data->next_pseudonym,
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os_strlen(data->next_pseudonym));
342
if (data->next_reauth_id) {
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wpa_printf(MSG_DEBUG, " *AT_NEXT_REAUTH_ID (%s)",
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data->next_reauth_id);
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eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_REAUTH_ID,
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os_strlen(data->next_reauth_id),
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(u8 *) data->next_reauth_id,
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os_strlen(data->next_reauth_id));
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if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
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wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
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static struct wpabuf * eap_aka_build_challenge(struct eap_sm *sm,
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struct eap_aka_data *data,
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struct eap_sim_msg *msg;
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wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Challenge");
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msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
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EAP_AKA_SUBTYPE_CHALLENGE);
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wpa_printf(MSG_DEBUG, " AT_RAND");
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eap_sim_msg_add(msg, EAP_SIM_AT_RAND, 0, data->rand, EAP_AKA_RAND_LEN);
372
wpa_printf(MSG_DEBUG, " AT_AUTN");
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eap_sim_msg_add(msg, EAP_SIM_AT_AUTN, 0, data->autn, EAP_AKA_AUTN_LEN);
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if (data->eap_method == EAP_TYPE_AKA_PRIME) {
376
/* Add the selected KDF into the beginning */
377
wpa_printf(MSG_DEBUG, " AT_KDF");
378
eap_sim_msg_add(msg, EAP_SIM_AT_KDF, data->kdf,
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wpa_printf(MSG_DEBUG, " AT_KDF");
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eap_sim_msg_add(msg, EAP_SIM_AT_KDF, EAP_AKA_PRIME_KDF,
384
wpa_printf(MSG_DEBUG, " AT_KDF_INPUT");
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eap_sim_msg_add(msg, EAP_SIM_AT_KDF_INPUT,
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data->network_name_len,
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data->network_name, data->network_name_len);
390
if (eap_aka_build_encr(sm, data, msg, 0, NULL)) {
391
eap_sim_msg_free(msg);
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eap_aka_add_checkcode(data, msg);
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if (sm->eap_sim_aka_result_ind) {
398
wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
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eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
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if (data->eap_method == EAP_TYPE_AKA) {
406
int aka_prime_preferred = 0;
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while (sm->user && i < EAP_MAX_METHODS &&
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(sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
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sm->user->methods[i].method != EAP_TYPE_NONE)) {
412
if (sm->user->methods[i].vendor == EAP_VENDOR_IETF) {
413
if (sm->user->methods[i].method ==
416
if (sm->user->methods[i].method ==
417
EAP_TYPE_AKA_PRIME) {
418
aka_prime_preferred = 1;
425
if (aka_prime_preferred)
426
flags |= EAP_AKA_BIDDING_FLAG_D;
427
eap_sim_msg_add(msg, EAP_SIM_AT_BIDDING, flags, NULL, 0);
429
#endif /* EAP_AKA_PRIME */
431
wpa_printf(MSG_DEBUG, " AT_MAC");
432
eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
433
return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
437
static struct wpabuf * eap_aka_build_reauth(struct eap_sm *sm,
438
struct eap_aka_data *data, u8 id)
440
struct eap_sim_msg *msg;
442
wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Re-authentication");
444
if (os_get_random(data->nonce_s, EAP_SIM_NONCE_S_LEN))
446
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA: NONCE_S",
447
data->nonce_s, EAP_SIM_NONCE_S_LEN);
449
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
450
eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
454
data->msk, data->emsk);
456
eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
457
data->msk, data->emsk);
458
eap_sim_derive_keys_reauth(data->counter, sm->identity,
459
sm->identity_len, data->nonce_s,
460
data->mk, data->msk, data->emsk);
463
msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
464
EAP_AKA_SUBTYPE_REAUTHENTICATION);
466
if (eap_aka_build_encr(sm, data, msg, data->counter, data->nonce_s)) {
467
eap_sim_msg_free(msg);
471
eap_aka_add_checkcode(data, msg);
473
if (sm->eap_sim_aka_result_ind) {
474
wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
475
eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
478
wpa_printf(MSG_DEBUG, " AT_MAC");
479
eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
480
return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
484
static struct wpabuf * eap_aka_build_notification(struct eap_sm *sm,
485
struct eap_aka_data *data,
488
struct eap_sim_msg *msg;
490
wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Notification");
491
msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
492
EAP_AKA_SUBTYPE_NOTIFICATION);
493
wpa_printf(MSG_DEBUG, " AT_NOTIFICATION (%d)", data->notification);
494
eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, data->notification,
496
if (data->use_result_ind) {
498
wpa_printf(MSG_DEBUG, " AT_IV");
499
wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
500
eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
501
EAP_SIM_AT_ENCR_DATA);
502
wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)",
504
eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
507
if (eap_sim_msg_add_encr_end(msg, data->k_encr,
508
EAP_SIM_AT_PADDING)) {
509
wpa_printf(MSG_WARNING, "EAP-AKA: Failed to "
510
"encrypt AT_ENCR_DATA");
511
eap_sim_msg_free(msg);
516
wpa_printf(MSG_DEBUG, " AT_MAC");
517
eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
519
return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
523
static struct wpabuf * eap_aka_buildReq(struct eap_sm *sm, void *priv, u8 id)
525
struct eap_aka_data *data = priv;
527
data->auts_reported = 0;
528
switch (data->state) {
530
return eap_aka_build_identity(sm, data, id);
532
return eap_aka_build_challenge(sm, data, id);
534
return eap_aka_build_reauth(sm, data, id);
536
return eap_aka_build_notification(sm, data, id);
538
wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in "
539
"buildReq", data->state);
546
static Boolean eap_aka_check(struct eap_sm *sm, void *priv,
547
struct wpabuf *respData)
549
struct eap_aka_data *data = priv;
553
pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
555
if (pos == NULL || len < 3) {
556
wpa_printf(MSG_INFO, "EAP-AKA: Invalid frame");
564
static Boolean eap_aka_subtype_ok(struct eap_aka_data *data, u8 subtype)
566
if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR ||
567
subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT)
570
switch (data->state) {
572
if (subtype != EAP_AKA_SUBTYPE_IDENTITY) {
573
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
574
"subtype %d", subtype);
579
if (subtype != EAP_AKA_SUBTYPE_CHALLENGE &&
580
subtype != EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) {
581
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
582
"subtype %d", subtype);
587
if (subtype != EAP_AKA_SUBTYPE_REAUTHENTICATION) {
588
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
589
"subtype %d", subtype);
594
if (subtype != EAP_AKA_SUBTYPE_NOTIFICATION) {
595
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
596
"subtype %d", subtype);
601
wpa_printf(MSG_INFO, "EAP-AKA: Unexpected state (%d) for "
602
"processing a response", data->state);
610
static void eap_aka_determine_identity(struct eap_sm *sm,
611
struct eap_aka_data *data,
612
int before_identity, int after_reauth)
621
if (after_reauth && data->reauth) {
622
identity = data->reauth->identity;
623
identity_len = data->reauth->identity_len;
624
} else if (sm->identity && sm->identity_len > 0 &&
625
sm->identity[0] == EAP_AKA_PERMANENT_PREFIX) {
626
identity = sm->identity;
627
identity_len = sm->identity_len;
629
identity = eap_sim_db_get_permanent(sm->eap_sim_db_priv,
633
if (identity == NULL) {
634
data->reauth = eap_sim_db_get_reauth_entry(
635
sm->eap_sim_db_priv, sm->identity,
638
data->reauth->aka_prime !=
639
(data->eap_method == EAP_TYPE_AKA_PRIME)) {
640
wpa_printf(MSG_DEBUG, "EAP-AKA: Reauth data "
641
"was for different AKA version");
645
wpa_printf(MSG_DEBUG, "EAP-AKA: Using fast "
646
"re-authentication");
647
identity = data->reauth->identity;
648
identity_len = data->reauth->identity_len;
649
data->counter = data->reauth->counter;
650
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
651
os_memcpy(data->k_encr,
652
data->reauth->k_encr,
654
os_memcpy(data->k_aut,
656
EAP_AKA_PRIME_K_AUT_LEN);
657
os_memcpy(data->k_re,
659
EAP_AKA_PRIME_K_RE_LEN);
661
os_memcpy(data->mk, data->reauth->mk,
668
if (identity == NULL ||
669
eap_sim_db_identity_known(sm->eap_sim_db_priv, sm->identity,
670
sm->identity_len) < 0) {
671
if (before_identity) {
672
wpa_printf(MSG_DEBUG, "EAP-AKA: Permanent user name "
673
"not known - send AKA-Identity request");
674
eap_aka_state(data, IDENTITY);
677
wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown whether the "
678
"permanent user name is known; try to use "
680
/* eap_sim_db_get_aka_auth() will report failure, if
681
* this identity is not known. */
685
wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity",
686
identity, identity_len);
688
if (!after_reauth && data->reauth) {
689
eap_aka_state(data, REAUTH);
693
res = eap_sim_db_get_aka_auth(sm->eap_sim_db_priv, identity,
694
identity_len, data->rand, data->autn,
695
data->ik, data->ck, data->res,
697
if (res == EAP_SIM_DB_PENDING) {
698
wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data "
699
"not yet available - pending request");
700
sm->method_pending = METHOD_PENDING_WAIT;
705
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
706
/* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
707
* needed 6-octet SQN ^AK for CK',IK' derivation */
708
eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
711
data->network_name_len);
713
#endif /* EAP_AKA_PRIME */
716
data->counter = 0; /* reset re-auth counter since this is full auth */
719
wpa_printf(MSG_INFO, "EAP-AKA: Failed to get AKA "
720
"authentication data for the peer");
721
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
722
eap_aka_state(data, NOTIFICATION);
725
if (sm->method_pending == METHOD_PENDING_WAIT) {
726
wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data "
727
"available - abort pending wait");
728
sm->method_pending = METHOD_PENDING_NONE;
731
identity_len = sm->identity_len;
732
while (identity_len > 0 && sm->identity[identity_len - 1] == '\0') {
733
wpa_printf(MSG_DEBUG, "EAP-AKA: Workaround - drop last null "
734
"character from identity");
737
wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity for MK derivation",
738
sm->identity, identity_len);
740
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
741
eap_aka_prime_derive_keys(identity, identity_len, data->ik,
742
data->ck, data->k_encr, data->k_aut,
743
data->k_re, data->msk, data->emsk);
745
eap_aka_derive_mk(sm->identity, identity_len, data->ik,
747
eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
748
data->msk, data->emsk);
751
eap_aka_state(data, CHALLENGE);
755
static void eap_aka_process_identity(struct eap_sm *sm,
756
struct eap_aka_data *data,
757
struct wpabuf *respData,
758
struct eap_sim_attrs *attr)
760
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Identity");
762
if (attr->mac || attr->iv || attr->encr_data) {
763
wpa_printf(MSG_WARNING, "EAP-AKA: Unexpected attribute "
764
"received in EAP-Response/AKA-Identity");
765
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
766
eap_aka_state(data, NOTIFICATION);
770
if (attr->identity) {
771
os_free(sm->identity);
772
sm->identity = os_malloc(attr->identity_len);
774
os_memcpy(sm->identity, attr->identity,
776
sm->identity_len = attr->identity_len;
780
eap_aka_determine_identity(sm, data, 0, 0);
781
if (eap_get_id(respData) == data->pending_id) {
782
data->pending_id = -1;
783
eap_aka_add_id_msg(data, respData);
788
static int eap_aka_verify_mac(struct eap_aka_data *data,
789
const struct wpabuf *req,
790
const u8 *mac, const u8 *extra,
793
if (data->eap_method == EAP_TYPE_AKA_PRIME)
794
return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
796
return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
800
static void eap_aka_process_challenge(struct eap_sm *sm,
801
struct eap_aka_data *data,
802
struct wpabuf *respData,
803
struct eap_sim_attrs *attr)
808
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Challenge");
812
/* KDF negotiation; to be enabled only after more than one KDF is
814
if (data->eap_method == EAP_TYPE_AKA_PRIME &&
815
attr->kdf_count == 1 && attr->mac == NULL) {
816
if (attr->kdf[0] != EAP_AKA_PRIME_KDF) {
817
wpa_printf(MSG_WARNING, "EAP-AKA': Peer selected "
820
EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
821
eap_aka_state(data, NOTIFICATION);
825
data->kdf = attr->kdf[0];
827
/* Allow negotiation to continue with the selected KDF by
828
* sending another Challenge message */
829
wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
833
#endif /* EAP_AKA_PRIME */
835
if (attr->checkcode &&
836
eap_aka_verify_checkcode(data, attr->checkcode,
837
attr->checkcode_len)) {
838
wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
840
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
841
eap_aka_state(data, NOTIFICATION);
844
if (attr->mac == NULL ||
845
eap_aka_verify_mac(data, respData, attr->mac, NULL, 0)) {
846
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
847
"did not include valid AT_MAC");
848
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
849
eap_aka_state(data, NOTIFICATION);
854
* AT_RES is padded, so verify that there is enough room for RES and
855
* that the RES length in bits matches with the expected RES.
857
if (attr->res == NULL || attr->res_len < data->res_len ||
858
attr->res_len_bits != data->res_len * 8 ||
859
os_memcmp(attr->res, data->res, data->res_len) != 0) {
860
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message did not "
861
"include valid AT_RES (attr len=%lu, res len=%lu "
862
"bits, expected %lu bits)",
863
(unsigned long) attr->res_len,
864
(unsigned long) attr->res_len_bits,
865
(unsigned long) data->res_len * 8);
866
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
867
eap_aka_state(data, NOTIFICATION);
871
wpa_printf(MSG_DEBUG, "EAP-AKA: Challenge response includes the "
873
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
874
data->use_result_ind = 1;
875
data->notification = EAP_SIM_SUCCESS;
876
eap_aka_state(data, NOTIFICATION);
878
eap_aka_state(data, SUCCESS);
880
identity = eap_sim_db_get_permanent(sm->eap_sim_db_priv, sm->identity,
881
sm->identity_len, &identity_len);
882
if (identity == NULL) {
883
identity = sm->identity;
884
identity_len = sm->identity_len;
887
if (data->next_pseudonym) {
888
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
890
data->next_pseudonym);
891
data->next_pseudonym = NULL;
893
if (data->next_reauth_id) {
894
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
896
eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv,
899
data->next_reauth_id,
901
data->k_encr, data->k_aut,
903
#endif /* EAP_AKA_PRIME */
905
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
907
data->next_reauth_id,
911
data->next_reauth_id = NULL;
916
static void eap_aka_process_sync_failure(struct eap_sm *sm,
917
struct eap_aka_data *data,
918
struct wpabuf *respData,
919
struct eap_sim_attrs *attr)
921
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Synchronization-Failure");
923
if (attr->auts == NULL) {
924
wpa_printf(MSG_WARNING, "EAP-AKA: Synchronization-Failure "
925
"message did not include valid AT_AUTS");
926
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
927
eap_aka_state(data, NOTIFICATION);
931
/* Avoid re-reporting AUTS when processing pending EAP packet by
932
* maintaining a local flag stating whether this AUTS has already been
934
if (!data->auts_reported &&
935
eap_sim_db_resynchronize(sm->eap_sim_db_priv, sm->identity,
936
sm->identity_len, attr->auts,
938
wpa_printf(MSG_WARNING, "EAP-AKA: Resynchronization failed");
939
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
940
eap_aka_state(data, NOTIFICATION);
943
data->auts_reported = 1;
945
/* Try again after resynchronization */
946
eap_aka_determine_identity(sm, data, 0, 0);
950
static void eap_aka_process_reauth(struct eap_sm *sm,
951
struct eap_aka_data *data,
952
struct wpabuf *respData,
953
struct eap_sim_attrs *attr)
955
struct eap_sim_attrs eattr;
956
u8 *decrypted = NULL;
957
const u8 *identity, *id2;
958
size_t identity_len, id2_len;
960
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Reauthentication");
962
if (attr->mac == NULL ||
963
eap_aka_verify_mac(data, respData, attr->mac, data->nonce_s,
964
EAP_SIM_NONCE_S_LEN)) {
965
wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message "
966
"did not include valid AT_MAC");
970
if (attr->encr_data == NULL || attr->iv == NULL) {
971
wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
972
"message did not include encrypted data");
976
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
977
attr->encr_data_len, attr->iv, &eattr,
979
if (decrypted == NULL) {
980
wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
981
"data from reauthentication message");
985
if (eattr.counter != data->counter) {
986
wpa_printf(MSG_WARNING, "EAP-AKA: Re-authentication message "
987
"used incorrect counter %u, expected %u",
988
eattr.counter, data->counter);
994
wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response includes "
995
"the correct AT_MAC");
997
if (eattr.counter_too_small) {
998
wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response "
999
"included AT_COUNTER_TOO_SMALL - starting full "
1001
eap_aka_determine_identity(sm, data, 0, 1);
1005
if (sm->eap_sim_aka_result_ind && attr->result_ind) {
1006
data->use_result_ind = 1;
1007
data->notification = EAP_SIM_SUCCESS;
1008
eap_aka_state(data, NOTIFICATION);
1010
eap_aka_state(data, SUCCESS);
1013
identity = data->reauth->identity;
1014
identity_len = data->reauth->identity_len;
1016
identity = sm->identity;
1017
identity_len = sm->identity_len;
1020
id2 = eap_sim_db_get_permanent(sm->eap_sim_db_priv, identity,
1021
identity_len, &id2_len);
1024
identity_len = id2_len;
1027
if (data->next_pseudonym) {
1028
eap_sim_db_add_pseudonym(sm->eap_sim_db_priv, identity,
1029
identity_len, data->next_pseudonym);
1030
data->next_pseudonym = NULL;
1032
if (data->next_reauth_id) {
1033
if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1034
#ifdef EAP_AKA_PRIME
1035
eap_sim_db_add_reauth_prime(sm->eap_sim_db_priv,
1038
data->next_reauth_id,
1040
data->k_encr, data->k_aut,
1042
#endif /* EAP_AKA_PRIME */
1044
eap_sim_db_add_reauth(sm->eap_sim_db_priv, identity,
1046
data->next_reauth_id,
1050
data->next_reauth_id = NULL;
1052
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
1053
data->reauth = NULL;
1059
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
1060
eap_aka_state(data, NOTIFICATION);
1061
eap_sim_db_remove_reauth(sm->eap_sim_db_priv, data->reauth);
1062
data->reauth = NULL;
1067
static void eap_aka_process_client_error(struct eap_sm *sm,
1068
struct eap_aka_data *data,
1069
struct wpabuf *respData,
1070
struct eap_sim_attrs *attr)
1072
wpa_printf(MSG_DEBUG, "EAP-AKA: Client reported error %d",
1073
attr->client_error_code);
1074
if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind)
1075
eap_aka_state(data, SUCCESS);
1077
eap_aka_state(data, FAILURE);
1081
static void eap_aka_process_authentication_reject(
1082
struct eap_sm *sm, struct eap_aka_data *data,
1083
struct wpabuf *respData, struct eap_sim_attrs *attr)
1085
wpa_printf(MSG_DEBUG, "EAP-AKA: Client rejected authentication");
1086
eap_aka_state(data, FAILURE);
1090
static void eap_aka_process_notification(struct eap_sm *sm,
1091
struct eap_aka_data *data,
1092
struct wpabuf *respData,
1093
struct eap_sim_attrs *attr)
1095
wpa_printf(MSG_DEBUG, "EAP-AKA: Client replied to notification");
1096
if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind)
1097
eap_aka_state(data, SUCCESS);
1099
eap_aka_state(data, FAILURE);
1103
static void eap_aka_process(struct eap_sm *sm, void *priv,
1104
struct wpabuf *respData)
1106
struct eap_aka_data *data = priv;
1107
const u8 *pos, *end;
1110
struct eap_sim_attrs attr;
1112
pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
1114
if (pos == NULL || len < 3)
1121
if (eap_aka_subtype_ok(data, subtype)) {
1122
wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized or unexpected "
1123
"EAP-AKA Subtype in EAP Response");
1124
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
1125
eap_aka_state(data, NOTIFICATION);
1129
if (eap_sim_parse_attr(pos, end, &attr,
1130
data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
1132
wpa_printf(MSG_DEBUG, "EAP-AKA: Failed to parse attributes");
1133
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
1134
eap_aka_state(data, NOTIFICATION);
1138
if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR) {
1139
eap_aka_process_client_error(sm, data, respData, &attr);
1143
if (subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT) {
1144
eap_aka_process_authentication_reject(sm, data, respData,
1149
switch (data->state) {
1151
eap_aka_process_identity(sm, data, respData, &attr);
1154
if (subtype == EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) {
1155
eap_aka_process_sync_failure(sm, data, respData,
1158
eap_aka_process_challenge(sm, data, respData, &attr);
1162
eap_aka_process_reauth(sm, data, respData, &attr);
1165
eap_aka_process_notification(sm, data, respData, &attr);
1168
wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in "
1169
"process", data->state);
1175
static Boolean eap_aka_isDone(struct eap_sm *sm, void *priv)
1177
struct eap_aka_data *data = priv;
1178
return data->state == SUCCESS || data->state == FAILURE;
1182
static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1184
struct eap_aka_data *data = priv;
1187
if (data->state != SUCCESS)
1190
key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1193
os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1194
*len = EAP_SIM_KEYING_DATA_LEN;
1199
static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1201
struct eap_aka_data *data = priv;
1204
if (data->state != SUCCESS)
1207
key = os_malloc(EAP_EMSK_LEN);
1210
os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1211
*len = EAP_EMSK_LEN;
1216
static Boolean eap_aka_isSuccess(struct eap_sm *sm, void *priv)
1218
struct eap_aka_data *data = priv;
1219
return data->state == SUCCESS;
1223
int eap_server_aka_register(void)
1225
struct eap_method *eap;
1228
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1229
EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1233
eap->init = eap_aka_init;
1234
eap->reset = eap_aka_reset;
1235
eap->buildReq = eap_aka_buildReq;
1236
eap->check = eap_aka_check;
1237
eap->process = eap_aka_process;
1238
eap->isDone = eap_aka_isDone;
1239
eap->getKey = eap_aka_getKey;
1240
eap->isSuccess = eap_aka_isSuccess;
1241
eap->get_emsk = eap_aka_get_emsk;
1243
ret = eap_server_method_register(eap);
1245
eap_server_method_free(eap);
1250
#ifdef EAP_AKA_PRIME
1251
int eap_server_aka_prime_register(void)
1253
struct eap_method *eap;
1256
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1257
EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1262
eap->init = eap_aka_prime_init;
1263
eap->reset = eap_aka_reset;
1264
eap->buildReq = eap_aka_buildReq;
1265
eap->check = eap_aka_check;
1266
eap->process = eap_aka_process;
1267
eap->isDone = eap_aka_isDone;
1268
eap->getKey = eap_aka_getKey;
1269
eap->isSuccess = eap_aka_isSuccess;
1270
eap->get_emsk = eap_aka_get_emsk;
1272
ret = eap_server_method_register(eap);
1274
eap_server_method_free(eap);
1278
#endif /* EAP_AKA_PRIME */