information (added if ieee80211d=1 in configuration)
* fixed WEP authentication (both Open System and Shared Key) with
mac80211
+ * added support for EAP-AKA' (draft-arkko-eap-aka-kdf)
2008-11-23 - v0.6.6
* added a new configuration option, wpa_ptk_rekey, that can be used to
ifdef CONFIG_EAP_AKA_PRIME
CFLAGS += -DEAP_AKA_PRIME
-OBJS += ../src/eap_server/eap_aka_prime.o
-CONFIG_EAP_SIM_COMMON=y
endif
ifdef CONFIG_EAP_SIM_COMMON
# EAP-AKA for the integrated EAP server
#CONFIG_EAP_AKA=y
+# EAP-AKA' for the integrated EAP server
+# This requires CONFIG_EAP_AKA to be enabled, too.
+#CONFIG_EAP_AKA_PRIME=y
+
# EAP-PAX for the integrated EAP server
#CONFIG_EAP_PAX=y
void eap_sim_add_mac(const u8 *k_aut, const u8 *msg, size_t msg_len, u8 *mac,
const u8 *extra, size_t extra_len);
+#ifdef EAP_AKA_PRIME
void eap_aka_prime_derive_keys(const u8 *identity, size_t identity_len,
const u8 *ik, const u8 *ck, u8 *k_encr,
u8 *k_aut, u8 *k_re, u8 *msk, u8 *emsk);
void eap_aka_prime_derive_ck_ik_prime(u8 *ck, u8 *ik, const u8 *sqn_ak,
const u8 *network_name,
size_t network_name_len);
+#else /* EAP_AKA_PRIME */
+static inline void eap_aka_prime_derive_keys(const u8 *identity,
+ size_t identity_len,
+ const u8 *ik, const u8 *ck,
+ u8 *k_encr, u8 *k_aut, u8 *k_re,
+ u8 *msk, u8 *emsk)
+{
+}
+
+static inline int eap_aka_prime_derive_keys_reauth(const u8 *k_re, u16 counter,
+ const u8 *identity,
+ size_t identity_len,
+ const u8 *nonce_s, u8 *msk,
+ u8 *emsk)
+{
+ return -1;
+}
+
+static inline int eap_sim_verify_mac_sha256(const u8 *k_aut,
+ const struct wpabuf *req,
+ const u8 *mac, const u8 *extra,
+ size_t extra_len)
+{
+ return -1;
+}
+#endif /* EAP_AKA_PRIME */
/* EAP-SIM/AKA Attributes (0..127 non-skippable) */
/*
- * EAP peer method: EAP-AKA (RFC 4187)
- * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
+ * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
+ * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
#include "pcsc_funcs.h"
#include "eap_common/eap_sim_common.h"
#include "sha1.h"
+#include "sha256.h"
#include "crypto.h"
#include "eap_peer/eap_config.h"
#ifdef CONFIG_USIM_SIMULATOR
size_t res_len;
u8 nonce_s[EAP_SIM_NONCE_S_LEN];
u8 mk[EAP_SIM_MK_LEN];
- u8 k_aut[EAP_SIM_K_AUT_LEN];
+ u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
u8 k_encr[EAP_SIM_K_ENCR_LEN];
+ u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
u8 msk[EAP_SIM_KEYING_DATA_LEN];
u8 emsk[EAP_EMSK_LEN];
u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
struct wpabuf *id_msgs;
int prev_id;
int result_ind, use_result_ind;
+ u8 eap_method;
+ u8 *network_name;
+ size_t network_name_len;
+ u16 kdf;
};
if (data == NULL)
return NULL;
+ data->eap_method = EAP_TYPE_AKA;
+
eap_aka_state(data, CONTINUE);
data->prev_id = -1;
}
+#ifdef EAP_AKA_PRIME
+static void * eap_aka_prime_init(struct eap_sm *sm)
+{
+ struct eap_aka_data *data = eap_aka_init(sm);
+ if (data == NULL)
+ return NULL;
+ data->eap_method = EAP_TYPE_AKA_PRIME;
+ return data;
+}
+#endif /* EAP_AKA_PRIME */
+
+
static void eap_aka_deinit(struct eap_sm *sm, void *priv)
{
struct eap_aka_data *data = priv;
os_free(data->reauth_id);
os_free(data->last_eap_identity);
wpabuf_free(data->id_msgs);
+ os_free(data->network_name);
os_free(data);
}
}
{
const u8 *addr;
size_t len;
- u8 hash[SHA1_MAC_LEN];
+ u8 hash[SHA256_MAC_LEN];
wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
return;
}
- /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
+ /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
addr = wpabuf_head(data->id_msgs);
len = wpabuf_len(data->id_msgs);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
- sha1_vector(1, &addr, &len, hash);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ sha256_vector(1, &addr, &len, hash);
+ else
+ sha1_vector(1, &addr, &len, hash);
eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
- EAP_AKA_CHECKCODE_LEN);
+ data->eap_method == EAP_TYPE_AKA_PRIME ?
+ EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
}
{
const u8 *addr;
size_t len;
- u8 hash[SHA1_MAC_LEN];
+ u8 hash[SHA256_MAC_LEN];
+ size_t hash_len;
if (checkcode == NULL)
return -1;
return 0;
}
- if (checkcode_len != EAP_AKA_CHECKCODE_LEN) {
+ hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
+ EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
+
+ if (checkcode_len != hash_len) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
"indicates that AKA/Identity message were not "
"used, but they were");
return -1;
}
- /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
+ /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
addr = wpabuf_head(data->id_msgs);
len = wpabuf_len(data->id_msgs);
- sha1_vector(1, &addr, &len, hash);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ sha256_vector(1, &addr, &len, hash);
+ else
+ sha1_vector(1, &addr, &len, hash);
- if (os_memcmp(hash, checkcode, EAP_AKA_CHECKCODE_LEN) != 0) {
+ if (os_memcmp(hash, checkcode, hash_len) != 0) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
return -1;
}
data->num_id_req = 0;
data->num_notification = 0;
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_CLIENT_ERROR);
eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
return eap_sim_msg_finish(msg, NULL, NULL, 0);
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
"(id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
return eap_sim_msg_finish(msg, NULL, NULL, 0);
}
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
"(id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
wpa_printf(MSG_DEBUG, " AT_AUTS");
eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
eap_aka_clear_identities(data, CLEAR_EAP_ID);
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_IDENTITY);
if (identity) {
struct eap_sim_msg *msg;
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_CHALLENGE);
wpa_printf(MSG_DEBUG, " AT_RES");
eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_REAUTHENTICATION);
wpa_printf(MSG_DEBUG, " AT_IV");
wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
EAP_AKA_SUBTYPE_NOTIFICATION);
if (k_aut && data->reauth) {
wpa_printf(MSG_DEBUG, " AT_IV");
}
+static int eap_aka_verify_mac(struct eap_aka_data *data,
+ const struct wpabuf *req,
+ const u8 *mac, const u8 *extra,
+ size_t extra_len)
+{
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
+ extra_len);
+ return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
+}
+
+
+#ifdef EAP_AKA_PRIME
+static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
+ u8 id, u16 kdf)
+{
+ struct eap_sim_msg *msg;
+
+ data->kdf = kdf;
+ wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
+ "select)", id);
+ msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
+ EAP_AKA_SUBTYPE_CHALLENGE);
+ wpa_printf(MSG_DEBUG, " AT_KDF");
+ eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
+ return eap_sim_msg_finish(msg, NULL, NULL, 0);
+}
+
+
+static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
+ u8 id, struct eap_sim_attrs *attr)
+{
+ size_t i;
+
+ for (i = 0; i < attr->kdf_count; i++) {
+ if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
+ return eap_aka_prime_kdf_select(data, id,
+ EAP_AKA_PRIME_KDF);
+ }
+
+ /* No matching KDF found - fail authentication as if AUTN had been
+ * incorrect */
+ return eap_aka_authentication_reject(data, id);
+}
+
+
+static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
+ struct eap_sim_attrs *attr)
+{
+ size_t i, j;
+
+ if (attr->kdf_count == 0)
+ return 0;
+
+ /* The only allowed (and required) duplication of a KDF is the addition
+ * of the selected KDF into the beginning of the list. */
+
+ if (data->kdf) {
+ if (attr->kdf[0] != data->kdf) {
+ wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
+ "accept the selected KDF");
+ return 0;
+ }
+
+ for (i = 1; i < attr->kdf_count; i++) {
+ if (attr->kdf[i] == data->kdf)
+ break;
+ }
+ if (i == attr->kdf_count &&
+ attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
+ wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
+ "duplicate the selected KDF");
+ return 0;
+ }
+
+ /* TODO: should check that the list is identical to the one
+ * used in the previous Challenge message apart from the added
+ * entry in the beginning. */
+ }
+
+ for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
+ for (j = i + 1; j < attr->kdf_count; j++) {
+ if (attr->kdf[i] == attr->kdf[j]) {
+ wpa_printf(MSG_WARNING, "EAP-AKA': The server "
+ "included a duplicated KDF");
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+#endif /* EAP_AKA_PRIME */
+
+
static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
struct eap_aka_data *data,
u8 id,
EAP_AKA_UNABLE_TO_PROCESS_PACKET);
}
+#ifdef EAP_AKA_PRIME
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ if (!attr->kdf_input || attr->kdf_input_len == 0) {
+ wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
+ "did not include non-empty AT_KDF_INPUT");
+ /* Fail authentication as if AUTN had been incorrect */
+ return eap_aka_authentication_reject(data, id);
+ }
+ os_free(data->network_name);
+ data->network_name = os_malloc(attr->kdf_input_len);
+ if (data->network_name == NULL) {
+ wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
+ "storing Network Name");
+ return eap_aka_authentication_reject(data, id);
+ }
+ os_memcpy(data->network_name, attr->kdf_input,
+ attr->kdf_input_len);
+ data->network_name_len = attr->kdf_input_len;
+ wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
+ "(AT_KDF_INPUT)",
+ data->network_name, data->network_name_len);
+ /* TODO: check Network Name per 3GPP.33.402 */
+
+ if (!eap_aka_prime_kdf_valid(data, attr))
+ return eap_aka_authentication_reject(data, id);
+
+ if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
+ return eap_aka_prime_kdf_neg(data, id, attr);
+
+ data->kdf = EAP_AKA_PRIME_KDF;
+ wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
+ }
+
+ if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
+ u16 flags = WPA_GET_BE16(attr->bidding);
+ if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
+ eap_allowed_method(sm, EAP_VENDOR_IETF,
+ EAP_TYPE_AKA_PRIME)) {
+ wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
+ "AKA' to AKA detected");
+ /* Fail authentication as if AUTN had been incorrect */
+ return eap_aka_authentication_reject(data, id);
+ }
+ }
+#endif /* EAP_AKA_PRIME */
+
data->reauth = 0;
if (!attr->mac || !attr->rand || !attr->autn) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
return eap_aka_client_error(data, id,
EAP_AKA_UNABLE_TO_PROCESS_PACKET);
}
+#ifdef EAP_AKA_PRIME
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
+ * needed 6-octet SQN ^AK for CK',IK' derivation */
+ eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
+ data->autn,
+ data->network_name,
+ data->network_name_len);
+ }
+#endif /* EAP_AKA_PRIME */
if (data->last_eap_identity) {
identity = data->last_eap_identity;
identity_len = data->last_eap_identity_len;
identity = eap_get_config_identity(sm, &identity_len);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
"derivation", identity, identity_len);
- eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
- data->mk);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
- data->emsk);
- if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
- {
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ eap_aka_prime_derive_keys(identity, identity_len, data->ik,
+ data->ck, data->k_encr, data->k_aut,
+ data->k_re, data->msk, data->emsk);
+ } else {
+ eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
+ data->mk);
+ eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
+ data->msk, data->emsk);
+ }
+ if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
"used invalid AT_MAC");
return eap_aka_client_error(data, id,
return -1;
}
- if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
- {
+ if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
"used invalid AT_MAC");
return -1;
}
data->reauth = 1;
- if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
- {
+ if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
"did not have valid AT_MAC");
return eap_aka_client_error(data, id,
"(%d <= %d)", eattr.counter, data->counter);
data->counter_too_small = eattr.counter;
- eap_sim_derive_keys_reauth(eattr.counter, data->reauth_id,
- data->reauth_id_len, eattr.nonce_s,
- data->mk, NULL, NULL);
-
/* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
* reauth_id must not be used to start a new reauthentication.
* However, since it was used in the last EAP-Response-Identity
wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
data->nonce_s, EAP_SIM_NONCE_S_LEN);
- eap_sim_derive_keys_reauth(data->counter,
- data->reauth_id, data->reauth_id_len,
- data->nonce_s, data->mk, data->msk,
- data->emsk);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
+ data->reauth_id,
+ data->reauth_id_len,
+ data->nonce_s,
+ data->msk, data->emsk);
+ } else {
+ eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
+ data->reauth_id_len,
+ data->nonce_s, data->mk,
+ data->msk, data->emsk);
+ }
eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_aka_learn_ids(data, &eattr);
return NULL;
}
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_AKA, reqData, &len);
+ pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
+ &len);
if (pos == NULL || len < 1) {
ret->ignore = TRUE;
return NULL;
wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
pos += 2; /* Reserved */
- if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 1,
+ if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
+ data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
0)) {
res = eap_aka_client_error(data, id,
EAP_AKA_UNABLE_TO_PROCESS_PACKET);
eap_peer_method_free(eap);
return ret;
}
+
+
+#ifdef EAP_AKA_PRIME
+int eap_peer_aka_prime_register(void)
+{
+ struct eap_method *eap;
+ int ret;
+
+ eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
+ EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
+ "AKA'");
+ if (eap == NULL)
+ return -1;
+
+ eap->init = eap_aka_prime_init;
+ eap->deinit = eap_aka_deinit;
+ eap->process = eap_aka_process;
+ eap->isKeyAvailable = eap_aka_isKeyAvailable;
+ eap->getKey = eap_aka_getKey;
+ eap->has_reauth_data = eap_aka_has_reauth_data;
+ eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
+ eap->init_for_reauth = eap_aka_init_for_reauth;
+ eap->get_identity = eap_aka_get_identity;
+ eap->get_emsk = eap_aka_get_emsk;
+
+ ret = eap_peer_method_register(eap);
+ if (ret)
+ eap_peer_method_free(eap);
+
+ return ret;
+}
+#endif /* EAP_AKA_PRIME */
+++ /dev/null
-/*
- * EAP peer method: EAP-AKA' (draft-arkko-eap-aka-kdf-10.txt)
- * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "eap_peer/eap_i.h"
-#include "pcsc_funcs.h"
-#include "eap_common/eap_sim_common.h"
-#include "sha1.h"
-#include "sha256.h"
-#include "crypto.h"
-#include "eap_peer/eap_config.h"
-#ifdef CONFIG_USIM_SIMULATOR
-#include "hlr_auc_gw/milenage.h"
-#endif /* CONFIG_USIM_SIMULATOR */
-
-
-struct eap_aka_data {
- u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
- size_t res_len;
- u8 nonce_s[EAP_SIM_NONCE_S_LEN];
- u8 mk[EAP_SIM_MK_LEN];
- u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
- u8 k_encr[EAP_SIM_K_ENCR_LEN];
- u8 k_re[EAP_AKA_PRIME_K_RE_LEN];
- u8 msk[EAP_SIM_KEYING_DATA_LEN];
- u8 emsk[EAP_EMSK_LEN];
- u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
- u8 auts[EAP_AKA_AUTS_LEN];
-
- int num_id_req, num_notification;
- u8 *pseudonym;
- size_t pseudonym_len;
- u8 *reauth_id;
- size_t reauth_id_len;
- int reauth;
- unsigned int counter, counter_too_small;
- u8 *last_eap_identity;
- size_t last_eap_identity_len;
- enum {
- CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
- } state;
-
- struct wpabuf *id_msgs;
- int prev_id;
- int result_ind, use_result_ind;
- u8 eap_method;
- u8 *network_name;
- size_t network_name_len;
- u16 kdf;
-};
-
-
-#ifndef CONFIG_NO_STDOUT_DEBUG
-static const char * eap_aka_state_txt(int state)
-{
- switch (state) {
- case CONTINUE:
- return "CONTINUE";
- case RESULT_SUCCESS:
- return "RESULT_SUCCESS";
- case RESULT_FAILURE:
- return "RESULT_FAILURE";
- case SUCCESS:
- return "SUCCESS";
- case FAILURE:
- return "FAILURE";
- default:
- return "?";
- }
-}
-#endif /* CONFIG_NO_STDOUT_DEBUG */
-
-
-static void eap_aka_state(struct eap_aka_data *data, int state)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA%s: %s -> %s",
- data->eap_method == EAP_TYPE_AKA_PRIME ? "'" : "",
- eap_aka_state_txt(data->state),
- eap_aka_state_txt(state));
- data->state = state;
-}
-
-
-static void * eap_aka_init(struct eap_sm *sm)
-{
- struct eap_aka_data *data;
- const char *phase1 = eap_get_config_phase1(sm);
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
-
- data->eap_method = EAP_TYPE_AKA;
-
- eap_aka_state(data, CONTINUE);
- data->prev_id = -1;
-
- data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
-
- return data;
-}
-
-
-static void * eap_aka_prime_init(struct eap_sm *sm)
-{
- struct eap_aka_data *data = eap_aka_init(sm);
- if (data == NULL)
- return NULL;
- data->eap_method = EAP_TYPE_AKA_PRIME;
- return data;
-}
-
-
-static void eap_aka_deinit(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- if (data) {
- os_free(data->pseudonym);
- os_free(data->reauth_id);
- os_free(data->last_eap_identity);
- wpabuf_free(data->id_msgs);
- os_free(data->network_name);
- os_free(data);
- }
-}
-
-
-static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
-{
- struct eap_peer_config *conf;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
-
- conf = eap_get_config(sm);
- if (conf == NULL)
- return -1;
- if (conf->pcsc) {
- return scard_umts_auth(sm->scard_ctx, data->rand,
- data->autn, data->res, &data->res_len,
- data->ik, data->ck, data->auts);
- }
-
-#ifdef CONFIG_USIM_SIMULATOR
- if (conf->password) {
- u8 opc[16], k[16], sqn[6];
- const char *pos;
- wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
- "implementation for UMTS authentication");
- if (conf->password_len < 78) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
- "password");
- return -1;
- }
- pos = (const char *) conf->password;
- if (hexstr2bin(pos, k, 16))
- return -1;
- pos += 32;
- if (*pos != ':')
- return -1;
- pos++;
-
- if (hexstr2bin(pos, opc, 16))
- return -1;
- pos += 32;
- if (*pos != ':')
- return -1;
- pos++;
-
- if (hexstr2bin(pos, sqn, 6))
- return -1;
-
- return milenage_check(opc, k, sqn, data->rand, data->autn,
- data->ik, data->ck,
- data->res, &data->res_len, data->auts);
- }
-#endif /* CONFIG_USIM_SIMULATOR */
-
-#ifdef CONFIG_USIM_HARDCODED
- wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
- "testing");
-
- /* These hardcoded Kc and SRES values are used for testing.
- * Could consider making them configurable. */
- os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
- data->res_len = EAP_AKA_RES_MAX_LEN;
- os_memset(data->ik, '3', EAP_AKA_IK_LEN);
- os_memset(data->ck, '4', EAP_AKA_CK_LEN);
- {
- u8 autn[EAP_AKA_AUTN_LEN];
- os_memset(autn, '1', EAP_AKA_AUTN_LEN);
- if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
- wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
- "with expected value");
- return -1;
- }
- }
-#if 0
- {
- static int test_resync = 1;
- if (test_resync) {
- /* Test Resynchronization */
- test_resync = 0;
- return -2;
- }
- }
-#endif
- return 0;
-
-#else /* CONFIG_USIM_HARDCODED */
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
- "enabled");
- return -1;
-
-#endif /* CONFIG_USIM_HARDCODED */
-}
-
-
-#define CLEAR_PSEUDONYM 0x01
-#define CLEAR_REAUTH_ID 0x02
-#define CLEAR_EAP_ID 0x04
-
-static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old%s%s%s",
- id & CLEAR_PSEUDONYM ? " pseudonym" : "",
- id & CLEAR_REAUTH_ID ? " reauth_id" : "",
- id & CLEAR_EAP_ID ? " eap_id" : "");
- if (id & CLEAR_PSEUDONYM) {
- os_free(data->pseudonym);
- data->pseudonym = NULL;
- data->pseudonym_len = 0;
- }
- if (id & CLEAR_REAUTH_ID) {
- os_free(data->reauth_id);
- data->reauth_id = NULL;
- data->reauth_id_len = 0;
- }
- if (id & CLEAR_EAP_ID) {
- os_free(data->last_eap_identity);
- data->last_eap_identity = NULL;
- data->last_eap_identity_len = 0;
- }
-}
-
-
-static int eap_aka_learn_ids(struct eap_aka_data *data,
- struct eap_sim_attrs *attr)
-{
- if (attr->next_pseudonym) {
- os_free(data->pseudonym);
- data->pseudonym = os_malloc(attr->next_pseudonym_len);
- if (data->pseudonym == NULL) {
- wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
- "next pseudonym");
- return -1;
- }
- os_memcpy(data->pseudonym, attr->next_pseudonym,
- attr->next_pseudonym_len);
- data->pseudonym_len = attr->next_pseudonym_len;
- wpa_hexdump_ascii(MSG_DEBUG,
- "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
- data->pseudonym,
- data->pseudonym_len);
- }
-
- if (attr->next_reauth_id) {
- os_free(data->reauth_id);
- data->reauth_id = os_malloc(attr->next_reauth_id_len);
- if (data->reauth_id == NULL) {
- wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
- "next reauth_id");
- return -1;
- }
- os_memcpy(data->reauth_id, attr->next_reauth_id,
- attr->next_reauth_id_len);
- data->reauth_id_len = attr->next_reauth_id_len;
- wpa_hexdump_ascii(MSG_DEBUG,
- "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
- data->reauth_id,
- data->reauth_id_len);
- }
-
- return 0;
-}
-
-
-static int eap_aka_add_id_msg(struct eap_aka_data *data,
- const struct wpabuf *msg)
-{
- if (msg == NULL)
- return -1;
-
- if (data->id_msgs == NULL) {
- data->id_msgs = wpabuf_dup(msg);
- return data->id_msgs == NULL ? -1 : 0;
- }
-
- if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
- return -1;
- wpabuf_put_buf(data->id_msgs, msg);
-
- return 0;
-}
-
-
-static void eap_aka_add_checkcode(struct eap_aka_data *data,
- struct eap_sim_msg *msg)
-{
- const u8 *addr;
- size_t len;
- u8 hash[SHA256_MAC_LEN];
-
- wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
-
- if (data->id_msgs == NULL) {
- /*
- * No EAP-AKA/Identity packets were exchanged - send empty
- * checkcode.
- */
- eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
- return;
- }
-
- /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
- addr = wpabuf_head(data->id_msgs);
- len = wpabuf_len(data->id_msgs);
- wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- sha256_vector(1, &addr, &len, hash);
- else
- sha1_vector(1, &addr, &len, hash);
-
- eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
- data->eap_method == EAP_TYPE_AKA_PRIME ?
- EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
-}
-
-
-static int eap_aka_verify_checkcode(struct eap_aka_data *data,
- const u8 *checkcode, size_t checkcode_len)
-{
- const u8 *addr;
- size_t len;
- u8 hash[SHA256_MAC_LEN];
- size_t hash_len;
-
- if (checkcode == NULL)
- return -1;
-
- if (data->id_msgs == NULL) {
- if (checkcode_len != 0) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
- "indicates that AKA/Identity messages were "
- "used, but they were not");
- return -1;
- }
- return 0;
- }
-
- hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
- EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
-
- if (checkcode_len != hash_len) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
- "indicates that AKA/Identity message were not "
- "used, but they were");
- return -1;
- }
-
- /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
- addr = wpabuf_head(data->id_msgs);
- len = wpabuf_len(data->id_msgs);
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- sha256_vector(1, &addr, &len, hash);
- else
- sha1_vector(1, &addr, &len, hash);
-
- if (os_memcmp(hash, checkcode, hash_len) != 0) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
- return -1;
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
- int err)
-{
- struct eap_sim_msg *msg;
-
- eap_aka_state(data, FAILURE);
- data->num_id_req = 0;
- data->num_notification = 0;
-
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_CLIENT_ERROR);
- eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
- u8 id)
-{
- struct eap_sim_msg *msg;
-
- eap_aka_state(data, FAILURE);
- data->num_id_req = 0;
- data->num_notification = 0;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
- "(id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_synchronization_failure(
- struct eap_aka_data *data, u8 id)
-{
- struct eap_sim_msg *msg;
-
- data->num_id_req = 0;
- data->num_notification = 0;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
- "(id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
- wpa_printf(MSG_DEBUG, " AT_AUTS");
- eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
- EAP_AKA_AUTS_LEN);
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
- struct eap_aka_data *data,
- u8 id,
- enum eap_sim_id_req id_req)
-{
- const u8 *identity = NULL;
- size_t identity_len = 0;
- struct eap_sim_msg *msg;
-
- data->reauth = 0;
- if (id_req == ANY_ID && data->reauth_id) {
- identity = data->reauth_id;
- identity_len = data->reauth_id_len;
- data->reauth = 1;
- } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
- data->pseudonym) {
- identity = data->pseudonym;
- identity_len = data->pseudonym_len;
- eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
- } else if (id_req != NO_ID_REQ) {
- identity = eap_get_config_identity(sm, &identity_len);
- if (identity) {
- eap_aka_clear_identities(data, CLEAR_PSEUDONYM |
- CLEAR_REAUTH_ID);
- }
- }
- if (id_req != NO_ID_REQ)
- eap_aka_clear_identities(data, CLEAR_EAP_ID);
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_IDENTITY);
-
- if (identity) {
- wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
- identity, identity_len);
- eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
- identity, identity_len);
- }
-
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
- u8 id)
-{
- struct eap_sim_msg *msg;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_CHALLENGE);
- wpa_printf(MSG_DEBUG, " AT_RES");
- eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
- data->res, data->res_len);
- eap_aka_add_checkcode(data, msg);
- if (data->use_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
-}
-
-
-static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
- u8 id, int counter_too_small,
- const u8 *nonce_s)
-{
- struct eap_sim_msg *msg;
- unsigned int counter;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
- id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_REAUTHENTICATION);
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
-
- if (counter_too_small) {
- wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
- counter = data->counter_too_small;
- } else
- counter = data->counter;
-
- wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
-
- if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
- "AT_ENCR_DATA");
- eap_sim_msg_free(msg);
- return NULL;
- }
- eap_aka_add_checkcode(data, msg);
- if (data->use_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
- EAP_SIM_NONCE_S_LEN);
-}
-
-
-static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
- u8 id, u16 notification)
-{
- struct eap_sim_msg *msg;
- u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_NOTIFICATION);
- if (k_aut && data->reauth) {
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
- EAP_SIM_AT_ENCR_DATA);
- wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
- NULL, 0);
- if (eap_sim_msg_add_encr_end(msg, data->k_encr,
- EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
- "AT_ENCR_DATA");
- eap_sim_msg_free(msg);
- return NULL;
- }
- }
- if (k_aut) {
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- }
- return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
-}
-
-
-static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
- struct eap_aka_data *data,
- u8 id,
- const struct wpabuf *reqData,
- struct eap_sim_attrs *attr)
-{
- int id_error;
- struct wpabuf *buf;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
-
- id_error = 0;
- switch (attr->id_req) {
- case NO_ID_REQ:
- break;
- case ANY_ID:
- if (data->num_id_req > 0)
- id_error++;
- data->num_id_req++;
- break;
- case FULLAUTH_ID:
- if (data->num_id_req > 1)
- id_error++;
- data->num_id_req++;
- break;
- case PERMANENT_ID:
- if (data->num_id_req > 2)
- id_error++;
- data->num_id_req++;
- break;
- }
- if (id_error) {
- wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
- "used within one authentication");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- buf = eap_aka_response_identity(sm, data, id, attr->id_req);
-
- if (data->prev_id != id) {
- eap_aka_add_id_msg(data, reqData);
- eap_aka_add_id_msg(data, buf);
- data->prev_id = id;
- }
-
- return buf;
-}
-
-
-static int eap_aka_verify_mac(struct eap_aka_data *data,
- const struct wpabuf *req,
- const u8 *mac, const u8 *extra,
- size_t extra_len)
-{
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
- extra_len);
- return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
-}
-
-
-#ifdef EAP_AKA_PRIME
-static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
- u8 id, u16 kdf)
-{
- struct eap_sim_msg *msg;
-
- data->kdf = kdf;
- wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
- "select)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
- EAP_AKA_SUBTYPE_CHALLENGE);
- wpa_printf(MSG_DEBUG, " AT_KDF");
- eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
- u8 id, struct eap_sim_attrs *attr)
-{
- size_t i;
-
- for (i = 0; i < attr->kdf_count; i++) {
- if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
- return eap_aka_prime_kdf_select(data, id,
- EAP_AKA_PRIME_KDF);
- }
-
- /* No matching KDF found - fail authentication as if AUTN had been
- * incorrect */
- return eap_aka_authentication_reject(data, id);
-}
-
-
-static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
- struct eap_sim_attrs *attr)
-{
- size_t i, j;
-
- if (attr->kdf_count == 0)
- return 0;
-
- /* The only allowed (and required) duplication of a KDF is the addition
- * of the selected KDF into the beginning of the list. */
-
- if (data->kdf) {
- if (attr->kdf[0] != data->kdf) {
- wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
- "accept the selected KDF");
- return 0;
- }
-
- for (i = 1; i < attr->kdf_count; i++) {
- if (attr->kdf[i] == data->kdf)
- break;
- }
- if (i == attr->kdf_count &&
- attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
- wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
- "duplicate the selected KDF");
- return 0;
- }
-
- /* TODO: should check that the list is identical to the one
- * used in the previous Challenge message apart from the added
- * entry in the beginning. */
- }
-
- for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
- for (j = i + 1; j < attr->kdf_count; j++) {
- if (attr->kdf[i] == attr->kdf[j]) {
- wpa_printf(MSG_WARNING, "EAP-AKA': The server "
- "included a duplicated KDF");
- return 0;
- }
- }
- }
-
- return 1;
-}
-#endif /* EAP_AKA_PRIME */
-
-
-static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
- struct eap_aka_data *data,
- u8 id,
- const struct wpabuf *reqData,
- struct eap_sim_attrs *attr)
-{
- const u8 *identity;
- size_t identity_len;
- int res;
- struct eap_sim_attrs eattr;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
-
- 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");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
-#ifdef EAP_AKA_PRIME
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- if (!attr->kdf_input || attr->kdf_input_len == 0) {
- wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
- "did not include non-empty AT_KDF_INPUT");
- /* Fail authentication as if AUTN had been incorrect */
- return eap_aka_authentication_reject(data, id);
- }
- os_free(data->network_name);
- data->network_name = os_malloc(attr->kdf_input_len);
- if (data->network_name == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
- "storing Network Name");
- return eap_aka_authentication_reject(data, id);
- }
- os_memcpy(data->network_name, attr->kdf_input,
- attr->kdf_input_len);
- data->network_name_len = attr->kdf_input_len;
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
- "(AT_KDF_INPUT)",
- data->network_name, data->network_name_len);
- /* TODO: check Network Name per 3GPP.33.402 */
-
- if (!eap_aka_prime_kdf_valid(data, attr))
- return eap_aka_authentication_reject(data, id);
-
- if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
- return eap_aka_prime_kdf_neg(data, id, attr);
-
- data->kdf = EAP_AKA_PRIME_KDF;
- wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
- }
-
- if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
- u16 flags = WPA_GET_BE16(attr->bidding);
- if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
- eap_allowed_method(sm, EAP_VENDOR_IETF,
- EAP_TYPE_AKA_PRIME)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
- "AKA' to AKA detected");
- /* Fail authentication as if AUTN had been incorrect */
- return eap_aka_authentication_reject(data, id);
- }
- }
-#endif /* EAP_AKA_PRIME */
-
- data->reauth = 0;
- if (!attr->mac || !attr->rand || !attr->autn) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
- "did not include%s%s%s",
- !attr->mac ? " AT_MAC" : "",
- !attr->rand ? " AT_RAND" : "",
- !attr->autn ? " AT_AUTN" : "");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
- os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
- os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
-
- res = eap_aka_umts_auth(sm, data);
- if (res == -1) {
- wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
- "failed (AUTN)");
- return eap_aka_authentication_reject(data, id);
- } else if (res == -2) {
- wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
- "failed (AUTN seq# -> AUTS)");
- return eap_aka_synchronization_failure(data, id);
- } else if (res) {
- wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-#ifdef EAP_AKA_PRIME
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
- * needed 6-octet SQN ^AK for CK',IK' derivation */
- eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
- data->autn,
- data->network_name,
- data->network_name_len);
- }
-#endif /* EAP_AKA_PRIME */
- if (data->last_eap_identity) {
- identity = data->last_eap_identity;
- identity_len = data->last_eap_identity_len;
- } else if (data->pseudonym) {
- identity = data->pseudonym;
- identity_len = data->pseudonym_len;
- } else
- identity = eap_get_config_identity(sm, &identity_len);
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
- "derivation", identity, identity_len);
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- eap_aka_prime_derive_keys(identity, identity_len, data->ik,
- data->ck, data->k_encr, data->k_aut,
- data->k_re, data->msk, data->emsk);
- } else {
- eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
- data->mk);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
- data->msk, data->emsk);
- }
- if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
- "used invalid AT_MAC");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- /* Old reauthentication and pseudonym identities must not be used
- * anymore. In other words, if no new identities are received, full
- * authentication will be used on next reauthentication. */
- eap_aka_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
- CLEAR_EAP_ID);
-
- if (attr->encr_data) {
- u8 *decrypted;
- decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
- attr->encr_data_len, attr->iv,
- &eattr, 0);
- if (decrypted == NULL) {
- return eap_aka_client_error(
- data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
- eap_aka_learn_ids(data, &eattr);
- os_free(decrypted);
- }
-
- if (data->result_ind && attr->result_ind)
- data->use_result_ind = 1;
-
- if (data->state != FAILURE && data->state != RESULT_FAILURE) {
- eap_aka_state(data, data->use_result_ind ?
- RESULT_SUCCESS : SUCCESS);
- }
-
- data->num_id_req = 0;
- data->num_notification = 0;
- /* RFC 4187 specifies that counter is initialized to one after
- * fullauth, but initializing it to zero makes it easier to implement
- * reauth verification. */
- data->counter = 0;
- return eap_aka_response_challenge(data, id);
-}
-
-
-static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
- struct eap_sim_attrs *attr)
-{
- struct eap_sim_attrs eattr;
- u8 *decrypted;
-
- if (attr->encr_data == NULL || attr->iv == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
- "reauth did not include encrypted data");
- return -1;
- }
-
- 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 notification message");
- return -1;
- }
-
- if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
- "message does not match with counter in reauth "
- "message");
- os_free(decrypted);
- return -1;
- }
-
- os_free(decrypted);
- return 0;
-}
-
-
-static int eap_aka_process_notification_auth(struct eap_aka_data *data,
- const struct wpabuf *reqData,
- struct eap_sim_attrs *attr)
-{
- if (attr->mac == NULL) {
- wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
- "Notification message");
- return -1;
- }
-
- if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
- "used invalid AT_MAC");
- return -1;
- }
-
- if (data->reauth &&
- eap_aka_process_notification_reauth(data, attr)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
- "message after reauth");
- return -1;
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_aka_process_notification(
- struct eap_sm *sm, struct eap_aka_data *data, u8 id,
- const struct wpabuf *reqData, struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
- if (data->num_notification > 0) {
- wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
- "rounds (only one allowed)");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
- data->num_notification++;
- if (attr->notification == -1) {
- wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
- "Notification message");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- if ((attr->notification & 0x4000) == 0 &&
- eap_aka_process_notification_auth(data, reqData, attr)) {
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
- if (attr->notification >= 0 && attr->notification < 32768) {
- eap_aka_state(data, FAILURE);
- } else if (attr->notification == EAP_SIM_SUCCESS &&
- data->state == RESULT_SUCCESS)
- eap_aka_state(data, SUCCESS);
- return eap_aka_response_notification(data, id, attr->notification);
-}
-
-
-static struct wpabuf * eap_aka_process_reauthentication(
- struct eap_sm *sm, struct eap_aka_data *data, u8 id,
- const struct wpabuf *reqData, struct eap_sim_attrs *attr)
-{
- struct eap_sim_attrs eattr;
- u8 *decrypted;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
-
- 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");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- if (data->reauth_id == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
- "reauthentication, but no reauth_id available");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- data->reauth = 1;
- if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
- "did not have valid AT_MAC");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- if (attr->encr_data == NULL || attr->iv == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
- "message did not include encrypted data");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- 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");
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- if (eattr.nonce_s == NULL || eattr.counter < 0) {
- wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
- !eattr.nonce_s ? " AT_NONCE_S" : "",
- eattr.counter < 0 ? " AT_COUNTER" : "");
- os_free(decrypted);
- return eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- }
-
- if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
- struct wpabuf *res;
- wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
- "(%d <= %d)", eattr.counter, data->counter);
- data->counter_too_small = eattr.counter;
-
- /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
- * reauth_id must not be used to start a new reauthentication.
- * However, since it was used in the last EAP-Response-Identity
- * packet, it has to saved for the following fullauth to be
- * used in MK derivation. */
- os_free(data->last_eap_identity);
- data->last_eap_identity = data->reauth_id;
- data->last_eap_identity_len = data->reauth_id_len;
- data->reauth_id = NULL;
- data->reauth_id_len = 0;
-
- res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
- os_free(decrypted);
-
- return res;
- }
- data->counter = eattr.counter;
-
- os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
- wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
- data->nonce_s, EAP_SIM_NONCE_S_LEN);
-
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
- data->reauth_id,
- data->reauth_id_len,
- data->nonce_s,
- data->msk, data->emsk);
- } else {
- eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
- data->reauth_id_len,
- data->nonce_s, data->mk,
- data->msk, data->emsk);
- }
- eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
- eap_aka_learn_ids(data, &eattr);
-
- if (data->result_ind && attr->result_ind)
- data->use_result_ind = 1;
-
- if (data->state != FAILURE && data->state != RESULT_FAILURE) {
- eap_aka_state(data, data->use_result_ind ?
- RESULT_SUCCESS : SUCCESS);
- }
-
- data->num_id_req = 0;
- data->num_notification = 0;
- if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
- "fast reauths performed - force fullauth");
- eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
- }
- os_free(decrypted);
- return eap_aka_response_reauth(data, id, 0, data->nonce_s);
-}
-
-
-static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
- struct eap_method_ret *ret,
- const struct wpabuf *reqData)
-{
- struct eap_aka_data *data = priv;
- const struct eap_hdr *req;
- u8 subtype, id;
- struct wpabuf *res;
- const u8 *pos;
- struct eap_sim_attrs attr;
- size_t len;
-
- wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
- if (eap_get_config_identity(sm, &len) == NULL) {
- wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
- eap_sm_request_identity(sm);
- ret->ignore = TRUE;
- return NULL;
- }
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
- &len);
- if (pos == NULL || len < 1) {
- ret->ignore = TRUE;
- return NULL;
- }
- req = wpabuf_head(reqData);
- id = req->identifier;
- len = be_to_host16(req->length);
-
- ret->ignore = FALSE;
- ret->methodState = METHOD_MAY_CONT;
- ret->decision = DECISION_FAIL;
- ret->allowNotifications = TRUE;
-
- subtype = *pos++;
- wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
- pos += 2; /* Reserved */
-
- if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
- data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
- 0)) {
- res = eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- goto done;
- }
-
- switch (subtype) {
- case EAP_AKA_SUBTYPE_IDENTITY:
- res = eap_aka_process_identity(sm, data, id, reqData, &attr);
- break;
- case EAP_AKA_SUBTYPE_CHALLENGE:
- res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
- break;
- case EAP_AKA_SUBTYPE_NOTIFICATION:
- res = eap_aka_process_notification(sm, data, id, reqData,
- &attr);
- break;
- case EAP_AKA_SUBTYPE_REAUTHENTICATION:
- res = eap_aka_process_reauthentication(sm, data, id, reqData,
- &attr);
- break;
- case EAP_AKA_SUBTYPE_CLIENT_ERROR:
- wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
- res = eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- break;
- default:
- wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
- res = eap_aka_client_error(data, id,
- EAP_AKA_UNABLE_TO_PROCESS_PACKET);
- break;
- }
-
-done:
- if (data->state == FAILURE) {
- ret->decision = DECISION_FAIL;
- ret->methodState = METHOD_DONE;
- } else if (data->state == SUCCESS) {
- ret->decision = data->use_result_ind ?
- DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
- /*
- * It is possible for the server to reply with AKA
- * Notification, so we must allow the method to continue and
- * not only accept EAP-Success at this point.
- */
- ret->methodState = data->use_result_ind ?
- METHOD_DONE : METHOD_MAY_CONT;
- } else if (data->state == RESULT_FAILURE)
- ret->methodState = METHOD_CONT;
- else if (data->state == RESULT_SUCCESS)
- ret->methodState = METHOD_CONT;
-
- if (ret->methodState == METHOD_DONE) {
- ret->allowNotifications = FALSE;
- }
-
- return res;
-}
-
-
-static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- return data->pseudonym || data->reauth_id;
-}
-
-
-static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- eap_aka_clear_identities(data, CLEAR_EAP_ID);
- data->prev_id = -1;
- wpabuf_free(data->id_msgs);
- data->id_msgs = NULL;
- data->use_result_ind = 0;
-}
-
-
-static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- data->num_id_req = 0;
- data->num_notification = 0;
- eap_aka_state(data, CONTINUE);
- return priv;
-}
-
-
-static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
- size_t *len)
-{
- struct eap_aka_data *data = priv;
-
- if (data->reauth_id) {
- *len = data->reauth_id_len;
- return data->reauth_id;
- }
-
- if (data->pseudonym) {
- *len = data->pseudonym_len;
- return data->pseudonym;
- }
-
- return NULL;
-}
-
-
-static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- return data->state == SUCCESS;
-}
-
-
-static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_aka_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
- if (key == NULL)
- return NULL;
-
- *len = EAP_SIM_KEYING_DATA_LEN;
- os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
-
- return key;
-}
-
-
-static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_aka_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_EMSK_LEN);
- if (key == NULL)
- return NULL;
-
- *len = EAP_EMSK_LEN;
- os_memcpy(key, data->emsk, EAP_EMSK_LEN);
-
- return key;
-}
-
-
-int eap_peer_aka_prime_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
- "AKA'");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_aka_prime_init;
- eap->deinit = eap_aka_deinit;
- eap->process = eap_aka_process;
- eap->isKeyAvailable = eap_aka_isKeyAvailable;
- eap->getKey = eap_aka_getKey;
- eap->has_reauth_data = eap_aka_has_reauth_data;
- eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
- eap->init_for_reauth = eap_aka_init_for_reauth;
- eap->get_identity = eap_aka_get_identity;
- eap->get_emsk = eap_aka_get_emsk;
-
- ret = eap_peer_method_register(eap);
- if (ret)
- eap_peer_method_free(eap);
-
-#ifdef EAP_AKA_PRIME_BOTH
- if (ret)
- return ret;
-
- eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_AKA,
- "AKA");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_aka_init;
- eap->deinit = eap_aka_deinit;
- eap->process = eap_aka_process;
- eap->isKeyAvailable = eap_aka_isKeyAvailable;
- eap->getKey = eap_aka_getKey;
- eap->has_reauth_data = eap_aka_has_reauth_data;
- eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
- eap->init_for_reauth = eap_aka_init_for_reauth;
- eap->get_identity = eap_aka_get_identity;
- eap->get_emsk = eap_aka_get_emsk;
-
- ret = eap_peer_method_register(eap);
- if (ret)
- eap_peer_method_free(eap);
-#endif /* EAP_AKA_PRIME_BOTH */
-
- return ret;
-}
/*
- * hostapd / EAP-AKA (RFC 4187)
+ * hostapd / EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
* Copyright (c) 2005-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
#include "eap_common/eap_sim_common.h"
#include "eap_server/eap_sim_db.h"
#include "sha1.h"
+#include "sha256.h"
#include "crypto.h"
struct eap_aka_data {
u8 mk[EAP_SIM_MK_LEN];
u8 nonce_s[EAP_SIM_NONCE_S_LEN];
- u8 k_aut[EAP_SIM_K_AUT_LEN];
+ u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
u8 k_encr[EAP_SIM_K_ENCR_LEN];
+ u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
u8 msk[EAP_SIM_KEYING_DATA_LEN];
u8 emsk[EAP_EMSK_LEN];
u8 rand[EAP_AKA_RAND_LEN];
struct wpabuf *id_msgs;
int pending_id;
+ u8 eap_method;
+ u8 *network_name;
+ size_t network_name_len;
+ u16 kdf;
};
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
+
+ data->eap_method = EAP_TYPE_AKA;
+
data->state = IDENTITY;
eap_aka_determine_identity(sm, data, 1, 0);
data->pending_id = -1;
}
+#ifdef EAP_AKA_PRIME
+static void * eap_aka_prime_init(struct eap_sm *sm)
+{
+ struct eap_aka_data *data;
+ /* TODO: make ANID configurable; see 3GPP TS 24.302 */
+ char *network_name = "WLAN";
+
+ if (sm->eap_sim_db_priv == NULL) {
+ wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured");
+ return NULL;
+ }
+
+ data = os_zalloc(sizeof(*data));
+ if (data == NULL)
+ return NULL;
+
+ data->eap_method = EAP_TYPE_AKA_PRIME;
+ data->network_name = os_malloc(os_strlen(network_name));
+ if (data->network_name == NULL) {
+ os_free(data);
+ return NULL;
+ }
+
+ data->network_name_len = os_strlen(network_name);
+ os_memcpy(data->network_name, network_name, data->network_name_len);
+
+ data->state = IDENTITY;
+ eap_aka_determine_identity(sm, data, 1, 0);
+ data->pending_id = -1;
+
+ return data;
+}
+#endif /* EAP_AKA_PRIME */
+
+
static void eap_aka_reset(struct eap_sm *sm, void *priv)
{
struct eap_aka_data *data = priv;
os_free(data->next_pseudonym);
os_free(data->next_reauth_id);
wpabuf_free(data->id_msgs);
+ os_free(data->network_name);
os_free(data);
}
{
const u8 *addr;
size_t len;
- u8 hash[SHA1_MAC_LEN];
+ u8 hash[SHA256_MAC_LEN];
wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
addr = wpabuf_head(data->id_msgs);
len = wpabuf_len(data->id_msgs);
wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
- sha1_vector(1, &addr, &len, hash);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ sha256_vector(1, &addr, &len, hash);
+ else
+ sha1_vector(1, &addr, &len, hash);
eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
- EAP_AKA_CHECKCODE_LEN);
+ data->eap_method == EAP_TYPE_AKA_PRIME ?
+ EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
}
{
const u8 *addr;
size_t len;
- u8 hash[SHA1_MAC_LEN];
+ u8 hash[SHA256_MAC_LEN];
+ size_t hash_len;
if (checkcode == NULL)
return -1;
return 0;
}
- if (checkcode_len != EAP_AKA_CHECKCODE_LEN) {
+ hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
+ EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
+
+ if (checkcode_len != hash_len) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer indicates "
"that AKA/Identity message were not used, but they "
"were");
/* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
addr = wpabuf_head(data->id_msgs);
len = wpabuf_len(data->id_msgs);
- sha1_vector(1, &addr, &len, hash);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ sha256_vector(1, &addr, &len, hash);
+ else
+ sha1_vector(1, &addr, &len, hash);
- if (os_memcmp(hash, checkcode, EAP_AKA_CHECKCODE_LEN) != 0) {
+ if (os_memcmp(hash, checkcode, hash_len) != 0) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
return -1;
}
struct wpabuf *buf;
wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Identity");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
EAP_AKA_SUBTYPE_IDENTITY);
if (eap_sim_db_identity_known(sm->eap_sim_db_priv, sm->identity,
sm->identity_len)) {
struct eap_sim_msg *msg;
wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Challenge");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
EAP_AKA_SUBTYPE_CHALLENGE);
wpa_printf(MSG_DEBUG, " AT_RAND");
eap_sim_msg_add(msg, EAP_SIM_AT_RAND, 0, data->rand, EAP_AKA_RAND_LEN);
eap_sim_msg_add(msg, EAP_SIM_AT_AUTN, 0, data->autn, EAP_AKA_AUTN_LEN);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ if (data->kdf) {
+ /* Add the selected KDF into the beginning */
+ eap_sim_msg_add(msg, EAP_SIM_AT_KDF, data->kdf,
+ NULL, 0);
+ }
+ eap_sim_msg_add(msg, EAP_SIM_AT_KDF, EAP_AKA_PRIME_KDF,
+ NULL, 0);
+ eap_sim_msg_add(msg, EAP_SIM_AT_KDF_INPUT,
+ data->network_name_len,
+ data->network_name, data->network_name_len);
+ }
if (eap_aka_build_encr(sm, data, msg, 0, NULL)) {
eap_sim_msg_free(msg);
eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
}
+#ifdef EAP_AKA_PRIME
+ if (data->eap_method == EAP_TYPE_AKA) {
+ u16 flags = 0;
+ int i;
+ int aka_prime_preferred = 0;
+
+ i = 0;
+ while (sm->user && i < EAP_MAX_METHODS &&
+ (sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
+ sm->user->methods[i].method != EAP_TYPE_NONE)) {
+ if (sm->user->methods[i].vendor == EAP_VENDOR_IETF) {
+ if (sm->user->methods[i].method ==
+ EAP_TYPE_AKA)
+ break;
+ if (sm->user->methods[i].method ==
+ EAP_TYPE_AKA_PRIME) {
+ aka_prime_preferred = 1;
+ break;
+ }
+ }
+ i++;
+ }
+
+ if (aka_prime_preferred)
+ flags |= EAP_AKA_BIDDING_FLAG_D;
+ eap_sim_msg_add(msg, EAP_SIM_AT_BIDDING, flags, NULL, 0);
+ }
+#endif /* EAP_AKA_PRIME */
+
wpa_printf(MSG_DEBUG, " AT_MAC");
eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA: NONCE_S",
data->nonce_s, EAP_SIM_NONCE_S_LEN);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
- data->emsk);
- eap_sim_derive_keys_reauth(data->counter, sm->identity,
- sm->identity_len, data->nonce_s, data->mk,
- data->msk, data->emsk);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
+ sm->identity,
+ sm->identity_len,
+ data->nonce_s,
+ data->msk, data->emsk);
+ } else {
+ eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
+ data->msk, data->emsk);
+ eap_sim_derive_keys_reauth(data->counter, sm->identity,
+ sm->identity_len, data->nonce_s,
+ data->mk, data->msk, data->emsk);
+ }
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
EAP_AKA_SUBTYPE_REAUTHENTICATION);
if (eap_aka_build_encr(sm, data, msg, data->counter, data->nonce_s)) {
struct eap_sim_msg *msg;
wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Notification");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_AKA,
+ msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
EAP_AKA_SUBTYPE_NOTIFICATION);
wpa_printf(MSG_DEBUG, " AT_NOTIFICATION (%d)", data->notification);
eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, data->notification,
static Boolean eap_aka_check(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
+ struct eap_aka_data *data = priv;
const u8 *pos;
size_t len;
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_AKA, respData, &len);
+ pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
+ &len);
if (pos == NULL || len < 3) {
wpa_printf(MSG_INFO, "EAP-AKA: Invalid frame");
return TRUE;
data->reauth = eap_sim_db_get_reauth_entry(
sm->eap_sim_db_priv, sm->identity,
sm->identity_len);
+ if (data->reauth &&
+ data->reauth->aka_prime !=
+ (data->eap_method == EAP_TYPE_AKA_PRIME)) {
+ wpa_printf(MSG_DEBUG, "EAP-AKA: Reauth data "
+ "was for different AKA version");
+ data->reauth = NULL;
+ }
if (data->reauth) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Using fast "
"re-authentication");
identity = data->reauth->identity;
identity_len = data->reauth->identity_len;
data->counter = data->reauth->counter;
- os_memcpy(data->mk, data->reauth->mk,
- EAP_SIM_MK_LEN);
+ 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);
+ }
}
}
}
return;
}
+#ifdef EAP_AKA_PRIME
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
+ * needed 6-octet SQN ^AK for CK',IK' derivation */
+ eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
+ data->autn,
+ data->network_name,
+ data->network_name_len);
+ }
+#endif /* EAP_AKA_PRIME */
+
data->reauth = NULL;
data->counter = 0; /* reset re-auth counter since this is full auth */
wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity for MK derivation",
sm->identity, identity_len);
- eap_aka_derive_mk(sm->identity, identity_len, data->ik, data->ck,
- data->mk);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
- data->emsk);
+ if (data->eap_method == EAP_TYPE_AKA_PRIME) {
+ eap_aka_prime_derive_keys(identity, identity_len, data->ik,
+ data->ck, data->k_encr, data->k_aut,
+ data->k_re, data->msk, data->emsk);
+ } else {
+ eap_aka_derive_mk(sm->identity, identity_len, data->ik,
+ data->ck, data->mk);
+ eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
+ data->msk, data->emsk);
+ }
eap_aka_state(data, CHALLENGE);
}
}
+static int eap_aka_verify_mac(struct eap_aka_data *data,
+ const struct wpabuf *req,
+ const u8 *mac, const u8 *extra,
+ size_t extra_len)
+{
+ if (data->eap_method == EAP_TYPE_AKA_PRIME)
+ return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
+ extra_len);
+ return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
+}
+
+
static void eap_aka_process_challenge(struct eap_sm *sm,
struct eap_aka_data *data,
struct wpabuf *respData,
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Challenge");
+#ifdef EAP_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_AKA_PRIME */
+
if (attr->checkcode &&
eap_aka_verify_checkcode(data, attr->checkcode,
attr->checkcode_len)) {
return;
}
if (attr->mac == NULL ||
- eap_sim_verify_mac(data->k_aut, respData, attr->mac, NULL, 0)) {
+ 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;
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);
+ if (data->eap_method == EAP_TYPE_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);
+ } 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;
}
}
wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Reauthentication");
if (attr->mac == NULL ||
- eap_sim_verify_mac(data->k_aut, respData, attr->mac, data->nonce_s,
+ 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");
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);
+ if (data->eap_method == EAP_TYPE_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);
+ } 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);
size_t len;
struct eap_sim_attrs attr;
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_AKA, respData, &len);
+ pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
+ &len);
if (pos == NULL || len < 3)
return;
return;
}
- if (eap_sim_parse_attr(pos, end, &attr, 1, 0)) {
+ if (eap_sim_parse_attr(pos, end, &attr,
+ data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
+ 0)) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Failed to parse attributes");
data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
eap_aka_state(data, NOTIFICATION);
eap_server_method_free(eap);
return ret;
}
+
+
+#ifdef EAP_AKA_PRIME
+int eap_server_aka_prime_register(void)
+{
+ struct eap_method *eap;
+ int ret;
+
+ eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
+ EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
+ "AKA'");
+ if (eap == NULL)
+ return -1;
+
+ eap->init = eap_aka_prime_init;
+ eap->reset = eap_aka_reset;
+ eap->buildReq = eap_aka_buildReq;
+ eap->check = eap_aka_check;
+ eap->process = eap_aka_process;
+ eap->isDone = eap_aka_isDone;
+ eap->getKey = eap_aka_getKey;
+ eap->isSuccess = eap_aka_isSuccess;
+ eap->get_emsk = eap_aka_get_emsk;
+
+ ret = eap_server_method_register(eap);
+ if (ret)
+ eap_server_method_free(eap);
+
+ return ret;
+}
+#endif /* EAP_AKA_PRIME */
+++ /dev/null
-/*
- * hostapd / EAP-AKA' (draft-arkko-eap-aka-kdf-10.txt)
- * Copyright (c) 2005-2008, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "eap_server/eap_i.h"
-#include "eap_common/eap_sim_common.h"
-#include "eap_server/eap_sim_db.h"
-#include "sha1.h"
-#include "sha256.h"
-#include "crypto.h"
-
-
-struct eap_aka_data {
- u8 mk[EAP_SIM_MK_LEN];
- u8 nonce_s[EAP_SIM_NONCE_S_LEN];
- u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
- u8 k_encr[EAP_SIM_K_ENCR_LEN];
- u8 k_re[EAP_AKA_PRIME_K_RE_LEN];
- u8 msk[EAP_SIM_KEYING_DATA_LEN];
- u8 emsk[EAP_EMSK_LEN];
- u8 rand[EAP_AKA_RAND_LEN];
- u8 autn[EAP_AKA_AUTN_LEN];
- u8 ck[EAP_AKA_CK_LEN];
- u8 ik[EAP_AKA_IK_LEN];
- u8 res[EAP_AKA_RES_MAX_LEN];
- size_t res_len;
- enum {
- IDENTITY, CHALLENGE, REAUTH, NOTIFICATION, SUCCESS, FAILURE
- } state;
- char *next_pseudonym;
- char *next_reauth_id;
- u16 counter;
- struct eap_sim_reauth *reauth;
- int auts_reported; /* whether the current AUTS has been reported to the
- * eap_sim_db */
- u16 notification;
- int use_result_ind;
-
- struct wpabuf *id_msgs;
- int pending_id;
- u8 eap_method;
- u8 *network_name;
- size_t network_name_len;
- u16 kdf;
-};
-
-
-static void eap_aka_determine_identity(struct eap_sm *sm,
- struct eap_aka_data *data,
- int before_identity, int after_reauth);
-
-
-static const char * eap_aka_state_txt(int state)
-{
- switch (state) {
- case IDENTITY:
- return "IDENTITY";
- case CHALLENGE:
- return "CHALLENGE";
- case REAUTH:
- return "REAUTH";
- case SUCCESS:
- return "SUCCESS";
- case FAILURE:
- return "FAILURE";
- case NOTIFICATION:
- return "NOTIFICATION";
- default:
- return "Unknown?!";
- }
-}
-
-
-static void eap_aka_state(struct eap_aka_data *data, int state)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA%s: %s -> %s",
- data->eap_method == EAP_TYPE_AKA_PRIME ? "'" : "",
- eap_aka_state_txt(data->state),
- eap_aka_state_txt(state));
- data->state = state;
-}
-
-
-#ifdef EAP_AKA_PRIME_BOTH
-static void * eap_aka_init(struct eap_sm *sm)
-{
- struct eap_aka_data *data;
-
- if (sm->eap_sim_db_priv == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured");
- return NULL;
- }
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
-
- data->eap_method = EAP_TYPE_AKA;
-
- data->state = IDENTITY;
- eap_aka_determine_identity(sm, data, 1, 0);
- data->pending_id = -1;
-
- return data;
-}
-#endif /* EAP_AKA_PRIME_BOTH */
-
-
-static void * eap_aka_prime_init(struct eap_sm *sm)
-{
- struct eap_aka_data *data;
- /* TODO: make ANID configurable; see 3GPP TS 24.302 */
- char *network_name = "WLAN";
-
- if (sm->eap_sim_db_priv == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: eap_sim_db not configured");
- return NULL;
- }
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
-
- data->eap_method = EAP_TYPE_AKA_PRIME;
- data->network_name = os_malloc(os_strlen(network_name));
- if (data->network_name == NULL) {
- os_free(data);
- return NULL;
- }
-
- data->network_name_len = os_strlen(network_name);
- os_memcpy(data->network_name, network_name, data->network_name_len);
-
- data->state = IDENTITY;
- eap_aka_determine_identity(sm, data, 1, 0);
- data->pending_id = -1;
-
- return data;
-}
-
-
-static void eap_aka_reset(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- os_free(data->next_pseudonym);
- os_free(data->next_reauth_id);
- wpabuf_free(data->id_msgs);
- os_free(data->network_name);
- os_free(data);
-}
-
-
-static int eap_aka_add_id_msg(struct eap_aka_data *data,
- const struct wpabuf *msg)
-{
- if (msg == NULL)
- return -1;
-
- if (data->id_msgs == NULL) {
- data->id_msgs = wpabuf_dup(msg);
- return data->id_msgs == NULL ? -1 : 0;
- }
-
- if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
- return -1;
- wpabuf_put_buf(data->id_msgs, msg);
-
- return 0;
-}
-
-
-static void eap_aka_add_checkcode(struct eap_aka_data *data,
- struct eap_sim_msg *msg)
-{
- const u8 *addr;
- size_t len;
- u8 hash[SHA256_MAC_LEN];
-
- wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
-
- if (data->id_msgs == NULL) {
- /*
- * No EAP-AKA/Identity packets were exchanged - send empty
- * checkcode.
- */
- eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
- return;
- }
-
- /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
- addr = wpabuf_head(data->id_msgs);
- len = wpabuf_len(data->id_msgs);
- wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- sha256_vector(1, &addr, &len, hash);
- else
- sha1_vector(1, &addr, &len, hash);
-
- eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
- data->eap_method == EAP_TYPE_AKA_PRIME ?
- EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
-}
-
-
-static int eap_aka_verify_checkcode(struct eap_aka_data *data,
- const u8 *checkcode, size_t checkcode_len)
-{
- const u8 *addr;
- size_t len;
- u8 hash[SHA256_MAC_LEN];
- size_t hash_len;
-
- if (checkcode == NULL)
- return -1;
-
- if (data->id_msgs == NULL) {
- if (checkcode_len != 0) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer "
- "indicates that AKA/Identity messages were "
- "used, but they were not");
- return -1;
- }
- return 0;
- }
-
- hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
- EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
-
- if (checkcode_len != hash_len) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from peer indicates "
- "that AKA/Identity message were not used, but they "
- "were");
- return -1;
- }
-
- /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
- addr = wpabuf_head(data->id_msgs);
- len = wpabuf_len(data->id_msgs);
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- sha256_vector(1, &addr, &len, hash);
- else
- sha1_vector(1, &addr, &len, hash);
-
- if (os_memcmp(hash, checkcode, hash_len) != 0) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
- return -1;
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_aka_build_identity(struct eap_sm *sm,
- struct eap_aka_data *data, u8 id)
-{
- struct eap_sim_msg *msg;
- struct wpabuf *buf;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Identity");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
- EAP_AKA_SUBTYPE_IDENTITY);
- if (eap_sim_db_identity_known(sm->eap_sim_db_priv, sm->identity,
- sm->identity_len)) {
- wpa_printf(MSG_DEBUG, " AT_PERMANENT_ID_REQ");
- eap_sim_msg_add(msg, EAP_SIM_AT_PERMANENT_ID_REQ, 0, NULL, 0);
- } else {
- /*
- * RFC 4187, Chap. 4.1.4 recommends that identity from EAP is
- * ignored and the AKA/Identity is used to request the
- * identity.
- */
- wpa_printf(MSG_DEBUG, " AT_ANY_ID_REQ");
- eap_sim_msg_add(msg, EAP_SIM_AT_ANY_ID_REQ, 0, NULL, 0);
- }
- buf = eap_sim_msg_finish(msg, NULL, NULL, 0);
- if (eap_aka_add_id_msg(data, buf) < 0) {
- wpabuf_free(buf);
- return NULL;
- }
- data->pending_id = id;
- return buf;
-}
-
-
-static int eap_aka_build_encr(struct eap_sm *sm, struct eap_aka_data *data,
- struct eap_sim_msg *msg, u16 counter,
- const u8 *nonce_s)
-{
- os_free(data->next_pseudonym);
- data->next_pseudonym =
- eap_sim_db_get_next_pseudonym(sm->eap_sim_db_priv, 1);
- os_free(data->next_reauth_id);
- if (data->counter <= EAP_AKA_MAX_FAST_REAUTHS) {
- data->next_reauth_id =
- eap_sim_db_get_next_reauth_id(sm->eap_sim_db_priv, 1);
- } else {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Max fast re-authentication "
- "count exceeded - force full authentication");
- data->next_reauth_id = NULL;
- }
-
- if (data->next_pseudonym == NULL && data->next_reauth_id == NULL &&
- counter == 0 && nonce_s == NULL)
- return 0;
-
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
-
- if (counter > 0) {
- wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
- }
-
- if (nonce_s) {
- wpa_printf(MSG_DEBUG, " *AT_NONCE_S");
- eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_S, 0, nonce_s,
- EAP_SIM_NONCE_S_LEN);
- }
-
- if (data->next_pseudonym) {
- wpa_printf(MSG_DEBUG, " *AT_NEXT_PSEUDONYM (%s)",
- data->next_pseudonym);
- eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_PSEUDONYM,
- os_strlen(data->next_pseudonym),
- (u8 *) data->next_pseudonym,
- os_strlen(data->next_pseudonym));
- }
-
- if (data->next_reauth_id) {
- wpa_printf(MSG_DEBUG, " *AT_NEXT_REAUTH_ID (%s)",
- data->next_reauth_id);
- eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_REAUTH_ID,
- os_strlen(data->next_reauth_id),
- (u8 *) data->next_reauth_id,
- os_strlen(data->next_reauth_id));
- }
-
- if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
- "AT_ENCR_DATA");
- return -1;
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_aka_build_challenge(struct eap_sm *sm,
- struct eap_aka_data *data,
- u8 id)
-{
- struct eap_sim_msg *msg;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Challenge");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
- EAP_AKA_SUBTYPE_CHALLENGE);
- wpa_printf(MSG_DEBUG, " AT_RAND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RAND, 0, data->rand, EAP_AKA_RAND_LEN);
- eap_sim_msg_add(msg, EAP_SIM_AT_AUTN, 0, data->autn, EAP_AKA_AUTN_LEN);
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- if (data->kdf) {
- /* Add the selected KDF into the beginning */
- eap_sim_msg_add(msg, EAP_SIM_AT_KDF, data->kdf,
- NULL, 0);
- }
- eap_sim_msg_add(msg, EAP_SIM_AT_KDF, EAP_AKA_PRIME_KDF,
- NULL, 0);
- eap_sim_msg_add(msg, EAP_SIM_AT_KDF_INPUT,
- data->network_name_len,
- data->network_name, data->network_name_len);
- }
-
- if (eap_aka_build_encr(sm, data, msg, 0, NULL)) {
- eap_sim_msg_free(msg);
- return NULL;
- }
-
- eap_aka_add_checkcode(data, msg);
-
- if (sm->eap_sim_aka_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
-
-#ifdef EAP_AKA_PRIME
- if (data->eap_method == EAP_TYPE_AKA) {
- u16 flags = 0;
- int i;
- int aka_prime_preferred = 0;
-
- i = 0;
- while (sm->user && i < EAP_MAX_METHODS &&
- (sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
- sm->user->methods[i].method != EAP_TYPE_NONE)) {
- if (sm->user->methods[i].vendor == EAP_VENDOR_IETF) {
- if (sm->user->methods[i].method ==
- EAP_TYPE_AKA)
- break;
- if (sm->user->methods[i].method ==
- EAP_TYPE_AKA_PRIME) {
- aka_prime_preferred = 1;
- break;
- }
- }
- i++;
- }
-
- if (aka_prime_preferred)
- flags |= EAP_AKA_BIDDING_FLAG_D;
- eap_sim_msg_add(msg, EAP_SIM_AT_BIDDING, flags, NULL, 0);
- }
-#endif /* EAP_AKA_PRIME */
-
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_build_reauth(struct eap_sm *sm,
- struct eap_aka_data *data, u8 id)
-{
- struct eap_sim_msg *msg;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Re-authentication");
-
- if (os_get_random(data->nonce_s, EAP_SIM_NONCE_S_LEN))
- return NULL;
- wpa_hexdump_key(MSG_MSGDUMP, "EAP-AKA: NONCE_S",
- data->nonce_s, EAP_SIM_NONCE_S_LEN);
-
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
- sm->identity,
- sm->identity_len,
- data->nonce_s,
- data->msk, data->emsk);
- } else {
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
- data->msk, data->emsk);
- eap_sim_derive_keys_reauth(data->counter, sm->identity,
- sm->identity_len, data->nonce_s,
- data->mk, data->msk, data->emsk);
- }
-
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
- EAP_AKA_SUBTYPE_REAUTHENTICATION);
-
- if (eap_aka_build_encr(sm, data, msg, data->counter, data->nonce_s)) {
- eap_sim_msg_free(msg);
- return NULL;
- }
-
- eap_aka_add_checkcode(data, msg);
-
- if (sm->eap_sim_aka_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
-
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_build_notification(struct eap_sm *sm,
- struct eap_aka_data *data,
- u8 id)
-{
- struct eap_sim_msg *msg;
-
- wpa_printf(MSG_DEBUG, "EAP-AKA: Generating Notification");
- msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, data->eap_method,
- EAP_AKA_SUBTYPE_NOTIFICATION);
- wpa_printf(MSG_DEBUG, " AT_NOTIFICATION (%d)", data->notification);
- eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, data->notification,
- NULL, 0);
- if (data->use_result_ind) {
- if (data->reauth) {
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
- EAP_SIM_AT_ENCR_DATA);
- wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)",
- data->counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
- NULL, 0);
-
- if (eap_sim_msg_add_encr_end(msg, data->k_encr,
- EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Failed to "
- "encrypt AT_ENCR_DATA");
- eap_sim_msg_free(msg);
- return NULL;
- }
- }
-
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- }
- return eap_sim_msg_finish(msg, data->k_aut, NULL, 0);
-}
-
-
-static struct wpabuf * eap_aka_buildReq(struct eap_sm *sm, void *priv, u8 id)
-{
- struct eap_aka_data *data = priv;
-
- data->auts_reported = 0;
- switch (data->state) {
- case IDENTITY:
- return eap_aka_build_identity(sm, data, id);
- case CHALLENGE:
- return eap_aka_build_challenge(sm, data, id);
- case REAUTH:
- return eap_aka_build_reauth(sm, data, id);
- case NOTIFICATION:
- return eap_aka_build_notification(sm, data, id);
- default:
- wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in "
- "buildReq", data->state);
- break;
- }
- return NULL;
-}
-
-
-static Boolean eap_aka_check(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_aka_data *data = priv;
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
- &len);
- if (pos == NULL || len < 3) {
- wpa_printf(MSG_INFO, "EAP-AKA: Invalid frame");
- return TRUE;
- }
-
- return FALSE;
-}
-
-
-static Boolean eap_aka_subtype_ok(struct eap_aka_data *data, u8 subtype)
-{
- if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR ||
- subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT)
- return FALSE;
-
- switch (data->state) {
- case IDENTITY:
- if (subtype != EAP_AKA_SUBTYPE_IDENTITY) {
- wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
- "subtype %d", subtype);
- return TRUE;
- }
- break;
- case CHALLENGE:
- if (subtype != EAP_AKA_SUBTYPE_CHALLENGE &&
- subtype != EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) {
- wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
- "subtype %d", subtype);
- return TRUE;
- }
- break;
- case REAUTH:
- if (subtype != EAP_AKA_SUBTYPE_REAUTHENTICATION) {
- wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
- "subtype %d", subtype);
- return TRUE;
- }
- break;
- case NOTIFICATION:
- if (subtype != EAP_AKA_SUBTYPE_NOTIFICATION) {
- wpa_printf(MSG_INFO, "EAP-AKA: Unexpected response "
- "subtype %d", subtype);
- return TRUE;
- }
- break;
- default:
- wpa_printf(MSG_INFO, "EAP-AKA: Unexpected state (%d) for "
- "processing a response", data->state);
- return TRUE;
- }
-
- return FALSE;
-}
-
-
-static void eap_aka_determine_identity(struct eap_sm *sm,
- struct eap_aka_data *data,
- int before_identity, int after_reauth)
-{
- const u8 *identity;
- size_t identity_len;
- int res;
-
- identity = NULL;
- identity_len = 0;
-
- if (after_reauth && data->reauth) {
- identity = data->reauth->identity;
- identity_len = data->reauth->identity_len;
- } else if (sm->identity && sm->identity_len > 0 &&
- sm->identity[0] == EAP_AKA_PERMANENT_PREFIX) {
- identity = sm->identity;
- identity_len = sm->identity_len;
- } else {
- identity = eap_sim_db_get_permanent(sm->eap_sim_db_priv,
- sm->identity,
- sm->identity_len,
- &identity_len);
- if (identity == NULL) {
- data->reauth = eap_sim_db_get_reauth_entry(
- sm->eap_sim_db_priv, sm->identity,
- sm->identity_len);
- if (data->reauth &&
- data->reauth->aka_prime !=
- (data->eap_method == EAP_TYPE_AKA_PRIME)) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Reauth data "
- "was for different AKA version");
- data->reauth = NULL;
- }
- if (data->reauth) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Using fast "
- "re-authentication");
- identity = data->reauth->identity;
- identity_len = data->reauth->identity_len;
- 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);
- }
- }
- }
- }
-
- if (identity == NULL ||
- eap_sim_db_identity_known(sm->eap_sim_db_priv, sm->identity,
- sm->identity_len) < 0) {
- if (before_identity) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Permanent user name "
- "not known - send AKA-Identity request");
- eap_aka_state(data, IDENTITY);
- return;
- } else {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown whether the "
- "permanent user name is known; try to use "
- "it");
- /* eap_sim_db_get_aka_auth() will report failure, if
- * this identity is not known. */
- }
- }
-
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity",
- identity, identity_len);
-
- if (!after_reauth && data->reauth) {
- eap_aka_state(data, REAUTH);
- return;
- }
-
- res = eap_sim_db_get_aka_auth(sm->eap_sim_db_priv, identity,
- identity_len, data->rand, data->autn,
- data->ik, data->ck, data->res,
- &data->res_len, sm);
- if (res == EAP_SIM_DB_PENDING) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data "
- "not yet available - pending request");
- sm->method_pending = METHOD_PENDING_WAIT;
- return;
- }
-
-#ifdef EAP_AKA_PRIME
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
- * needed 6-octet SQN ^AK for CK',IK' derivation */
- eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
- data->autn,
- data->network_name,
- data->network_name_len);
- }
-#endif /* EAP_AKA_PRIME */
-
- data->reauth = NULL;
- data->counter = 0; /* reset re-auth counter since this is full auth */
-
- if (res != 0) {
- wpa_printf(MSG_INFO, "EAP-AKA: Failed to get AKA "
- "authentication data for the peer");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
- if (sm->method_pending == METHOD_PENDING_WAIT) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: AKA authentication data "
- "available - abort pending wait");
- sm->method_pending = METHOD_PENDING_NONE;
- }
-
- identity_len = sm->identity_len;
- while (identity_len > 0 && sm->identity[identity_len - 1] == '\0') {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Workaround - drop last null "
- "character from identity");
- identity_len--;
- }
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Identity for MK derivation",
- sm->identity, identity_len);
-
- if (data->eap_method == EAP_TYPE_AKA_PRIME) {
- eap_aka_prime_derive_keys(identity, identity_len, data->ik,
- data->ck, data->k_encr, data->k_aut,
- data->k_re, data->msk, data->emsk);
- } else {
- eap_aka_derive_mk(sm->identity, identity_len, data->ik,
- data->ck, data->mk);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
- data->msk, data->emsk);
- }
-
- eap_aka_state(data, CHALLENGE);
-}
-
-
-static void eap_aka_process_identity(struct eap_sm *sm,
- struct eap_aka_data *data,
- struct wpabuf *respData,
- struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Identity");
-
- if (attr->mac || attr->iv || attr->encr_data) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Unexpected attribute "
- "received in EAP-Response/AKA-Identity");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
-
- if (attr->identity) {
- os_free(sm->identity);
- sm->identity = os_malloc(attr->identity_len);
- if (sm->identity) {
- os_memcpy(sm->identity, attr->identity,
- attr->identity_len);
- sm->identity_len = attr->identity_len;
- }
- }
-
- eap_aka_determine_identity(sm, data, 0, 0);
- if (eap_get_id(respData) == data->pending_id) {
- data->pending_id = -1;
- eap_aka_add_id_msg(data, respData);
- }
-}
-
-
-static int eap_aka_verify_mac(struct eap_aka_data *data,
- const struct wpabuf *req,
- const u8 *mac, const u8 *extra,
- size_t extra_len)
-{
- if (data->eap_method == EAP_TYPE_AKA_PRIME)
- return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
- extra_len);
- return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
-}
-
-
-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");
-
-#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
-
- 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) {
- 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);
- } 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_aka_process_sync_failure(struct eap_sm *sm,
- struct eap_aka_data *data,
- struct wpabuf *respData,
- struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: Processing Synchronization-Failure");
-
- if (attr->auts == NULL) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Synchronization-Failure "
- "message did not include valid AT_AUTS");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
-
- /* Avoid re-reporting AUTS when processing pending EAP packet by
- * maintaining a local flag stating whether this AUTS has already been
- * reported. */
- if (!data->auts_reported &&
- eap_sim_db_resynchronize(sm->eap_sim_db_priv, sm->identity,
- sm->identity_len, attr->auts,
- data->rand)) {
- wpa_printf(MSG_WARNING, "EAP-AKA: Resynchronization failed");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
- data->auts_reported = 1;
-
- /* Try again after resynchronization */
- eap_aka_determine_identity(sm, data, 0, 0);
-}
-
-
-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) {
- 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);
- } 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_client_error(struct eap_sm *sm,
- struct eap_aka_data *data,
- struct wpabuf *respData,
- struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: Client reported error %d",
- attr->client_error_code);
- if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind)
- eap_aka_state(data, SUCCESS);
- else
- eap_aka_state(data, FAILURE);
-}
-
-
-static void eap_aka_process_authentication_reject(
- struct eap_sm *sm, struct eap_aka_data *data,
- struct wpabuf *respData, struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: Client rejected authentication");
- eap_aka_state(data, FAILURE);
-}
-
-
-static void eap_aka_process_notification(struct eap_sm *sm,
- struct eap_aka_data *data,
- struct wpabuf *respData,
- struct eap_sim_attrs *attr)
-{
- wpa_printf(MSG_DEBUG, "EAP-AKA: Client replied to notification");
- if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind)
- eap_aka_state(data, SUCCESS);
- else
- eap_aka_state(data, FAILURE);
-}
-
-
-static void eap_aka_process(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_aka_data *data = priv;
- const u8 *pos, *end;
- u8 subtype;
- size_t len;
- struct eap_sim_attrs attr;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, respData,
- &len);
- if (pos == NULL || len < 3)
- return;
-
- end = pos + len;
- subtype = *pos;
- pos += 3;
-
- if (eap_aka_subtype_ok(data, subtype)) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized or unexpected "
- "EAP-AKA Subtype in EAP Response");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
-
- if (eap_sim_parse_attr(pos, end, &attr,
- data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
- 0)) {
- wpa_printf(MSG_DEBUG, "EAP-AKA: Failed to parse attributes");
- data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH;
- eap_aka_state(data, NOTIFICATION);
- return;
- }
-
- if (subtype == EAP_AKA_SUBTYPE_CLIENT_ERROR) {
- eap_aka_process_client_error(sm, data, respData, &attr);
- return;
- }
-
- if (subtype == EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT) {
- eap_aka_process_authentication_reject(sm, data, respData,
- &attr);
- return;
- }
-
- switch (data->state) {
- case IDENTITY:
- eap_aka_process_identity(sm, data, respData, &attr);
- break;
- case CHALLENGE:
- if (subtype == EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE) {
- eap_aka_process_sync_failure(sm, data, respData,
- &attr);
- } else {
- eap_aka_process_challenge(sm, data, respData, &attr);
- }
- break;
- case REAUTH:
- eap_aka_process_reauth(sm, data, respData, &attr);
- break;
- case NOTIFICATION:
- eap_aka_process_notification(sm, data, respData, &attr);
- break;
- default:
- wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown state %d in "
- "process", data->state);
- break;
- }
-}
-
-
-static Boolean eap_aka_isDone(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- return data->state == SUCCESS || data->state == FAILURE;
-}
-
-
-static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_aka_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
- if (key == NULL)
- return NULL;
- os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
- *len = EAP_SIM_KEYING_DATA_LEN;
- return key;
-}
-
-
-static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_aka_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_EMSK_LEN);
- if (key == NULL)
- return NULL;
- os_memcpy(key, data->emsk, EAP_EMSK_LEN);
- *len = EAP_EMSK_LEN;
- return key;
-}
-
-
-static Boolean eap_aka_isSuccess(struct eap_sm *sm, void *priv)
-{
- struct eap_aka_data *data = priv;
- return data->state == SUCCESS;
-}
-
-
-int eap_server_aka_prime_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
- "AKA'");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_aka_prime_init;
- eap->reset = eap_aka_reset;
- eap->buildReq = eap_aka_buildReq;
- eap->check = eap_aka_check;
- eap->process = eap_aka_process;
- eap->isDone = eap_aka_isDone;
- eap->getKey = eap_aka_getKey;
- eap->isSuccess = eap_aka_isSuccess;
- eap->get_emsk = eap_aka_get_emsk;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
-
-#ifdef EAP_AKA_PRIME_BOTH
- if (ret)
- return ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_AKA,
- "AKA");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_aka_init;
- eap->reset = eap_aka_reset;
- eap->buildReq = eap_aka_buildReq;
- eap->check = eap_aka_check;
- eap->process = eap_aka_process;
- eap->isDone = eap_aka_isDone;
- eap->getKey = eap_aka_getKey;
- eap->isSuccess = eap_aka_isSuccess;
- eap->get_emsk = eap_aka_get_emsk;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
-#endif /* EAP_AKA_PRIME_BOTH */
-
- return ret;
-}
wpa_supplicant.conf (see WPS section in the example configuration
file); new wpa_cli commands wps_pin, wps_pbc, and wps_reg are used to
manage WPS negotiation; see README-WPS for more details
+ * added support for EAP-AKA' (draft-arkko-eap-aka-kdf)
+
2008-11-23 - v0.6.6
* added Milenage SIM/USIM emulator for EAP-SIM/EAP-AKA
(can be used to simulate test SIM/USIM card with a known private key;
# EAP-AKA'
ifeq ($(CONFIG_EAP_AKA_PRIME), dyn)
CFLAGS += -DEAP_AKA_PRIME_DYNAMIC
-EAPDYN += ../src/eap_peer/eap_aka_prime.so
else
CFLAGS += -DEAP_AKA_PRIME
-OBJS += ../src/eap_peer/eap_aka_prime.o
-OBJS_h += ../src/eap_server/eap_aka_prime.o
endif
-CONFIG_IEEE8021X_EAPOL=y
-CONFIG_EAP_SIM_COMMON=y
endif
ifdef CONFIG_EAP_SIM_COMMON
# EAP-AKA (enable CONFIG_PCSC, if EAP-AKA is used)
#CONFIG_EAP_AKA=y
+# EAP-AKA' (enable CONFIG_PCSC, if EAP-AKA' is used).
+# This requires CONFIG_EAP_AKA to be enabled, too.
+#CONFIG_EAP_AKA_PRIME=y
+
# Enable USIM simulator (Milenage) for EAP-AKA
#CONFIG_USIM_SIMULATOR=y
EAP-TTLS + TNC - - - - - + - - - - + -
EAP-SIM + - - ? - + - ? - - + -
EAP-AKA - - - - - + - - - - + -
+EAP-AKA' - - - - - - - - - - + -
EAP-PSK +7 - - - - + - - - - + -
EAP-PAX - - - - - + - - - - + -
EAP-SAKE - - - - - - - - - - + -
<li>EAP-TTLS/CHAP</li>
<li>EAP-SIM</li>
<li>EAP-AKA</li>
+<li>EAP-AKA'</li>
<li>EAP-PAX</li>
<li>EAP-PSK</li>
<li>EAP-SAKE</li>
<address><a href="mailto:j@w1.fi">Jouni Malinen</a></address>
<!-- Created: Sun Jan 2 17:20:17 PST 2005 -->
<!-- hhmts start -->
-Last modified: Fri Nov 28 18:27:51 EET 2008
+Last modified: Sun Dec 7 19:24:25 EET 2008
<!-- hhmts end -->
</div>
</body>
<li>EAP-TTLS/CHAP</li>
<li>EAP-SIM</li>
<li>EAP-AKA</li>
+<li>EAP-AKA'</li>
<li>EAP-PSK</li>
<li>EAP-FAST</li>
<li>EAP-PAX</li>
<address><a href="mailto:j@w1.fi">Jouni Malinen</a></address>
<!-- Created: Sat May 22 21:41:58 PDT 2004 -->
<!-- hhmts start -->
-Last modified: Fri Nov 28 18:27:42 EET 2008
+Last modified: Sun Dec 7 19:24:16 EET 2008
<!-- hhmts end -->
</div>
</body>
projects / libeap.git / commitdiff