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EAP-SIM/AKA: Store pseudonym identity in configuration

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Use the anonymous_identity field to store EAP-SIM/AKA pseudonym identity
so that this can be maintained between EAP sessions (e.g., after
wpa_supplicant restart) even if fast re-authentication data was cleared.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-09-02 13:04:18 +03:00
parent 50a7755735
commit e026159a8e
10 changed files with 163 additions and 21 deletions
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13
src/eap_peer/eap.c
View file

@ -2321,3 +2321,16 @@ void eap_sm_set_ext_pw_ctx(struct eap_sm *sm, struct ext_password_data *ext)
sm->ext_pw_buf = NULL;
sm->ext_pw = ext;
}
/**
* eap_set_anon_id - Set or add anonymous identity
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @id: Anonymous identity (e.g., EAP-SIM pseudonym) or %NULL to clear
* @len: Length of anonymous identity in octets
*/
void eap_set_anon_id(struct eap_sm *sm, const u8 *id, size_t len)
{
if (sm->eapol_cb->set_anon_id)
sm->eapol_cb->set_anon_id(sm->eapol_ctx, id, len);
}

11
src/eap_peer/eap.h
View file

@ -1,6 +1,6 @@
/*
* EAP peer state machine functions (RFC 4137)
* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -235,6 +235,14 @@ struct eapol_callbacks {
*/
void (*notify_status)(void *ctx, const char *status,
const char *parameter);
/**
* set_anon_id - Set or add anonymous identity
* @ctx: eapol_ctx from eap_peer_sm_init() call
* @id: Anonymous identity (e.g., EAP-SIM pseudonym) or %NULL to clear
* @len: Length of anonymous identity in octets
*/
void (*set_anon_id)(void *ctx, const u8 *id, size_t len);
};
/**
@ -308,6 +316,7 @@ int eap_is_wps_pin_enrollee(struct eap_peer_config *conf);
struct ext_password_data;
void eap_sm_set_ext_pw_ctx(struct eap_sm *sm, struct ext_password_data *ext);
void eap_set_anon_id(struct eap_sm *sm, const u8 *id, size_t len);
#endif /* IEEE8021X_EAPOL */

30
src/eap_peer/eap_aka.c
View file

@ -90,6 +90,7 @@ static void * eap_aka_init(struct eap_sm *sm)
{
struct eap_aka_data *data;
const char *phase1 = eap_get_config_phase1(sm);
struct eap_peer_config *config = eap_get_config(sm);
data = os_zalloc(sizeof(*data));
if (data == NULL)
@ -102,6 +103,15 @@ static void * eap_aka_init(struct eap_sm *sm)
data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
if (config && config->anonymous_identity) {
data->pseudonym = os_malloc(config->anonymous_identity_len);
if (data->pseudonym) {
os_memcpy(data->pseudonym, config->anonymous_identity,
config->anonymous_identity_len);
data->pseudonym_len = config->anonymous_identity_len;
}
}
return data;
}
@ -227,13 +237,15 @@ static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
#define CLEAR_REAUTH_ID 0x02
#define CLEAR_EAP_ID 0x04
static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
static void eap_aka_clear_identities(struct eap_sm *sm,
struct eap_aka_data *data, int id)
{
if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym");
os_free(data->pseudonym);
data->pseudonym = NULL;
data->pseudonym_len = 0;
eap_set_anon_id(sm, NULL, 0);
}
if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id");
@ -288,6 +300,7 @@ static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data,
realm, realm_len);
}
data->pseudonym_len = attr->next_pseudonym_len + realm_len;
eap_set_anon_id(sm, data->pseudonym, data->pseudonym_len);
}
if (attr->next_reauth_id) {
@ -488,16 +501,16 @@ static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
data->pseudonym) {
identity = data->pseudonym;
identity_len = data->pseudonym_len;
eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
eap_aka_clear_identities(sm, 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 |
eap_aka_clear_identities(sm, data, CLEAR_PSEUDONYM |
CLEAR_REAUTH_ID);
}
}
if (id_req != NO_ID_REQ)
eap_aka_clear_identities(data, CLEAR_EAP_ID);
eap_aka_clear_identities(sm, 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,
@ -900,7 +913,7 @@ static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
* other words, if no new identities are received, full
* authentication will be used on next reauthentication (using
* pseudonym identity or permanent identity). */
eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
if (attr->encr_data) {
u8 *decrypted;
@ -1128,7 +1141,7 @@ static struct wpabuf * eap_aka_process_reauthentication(
data->nonce_s, data->mk,
data->msk, data->emsk);
}
eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_aka_learn_ids(sm, data, &eattr);
if (data->result_ind && attr->result_ind)
@ -1144,7 +1157,8 @@ static struct wpabuf * eap_aka_process_reauthentication(
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);
eap_aka_clear_identities(sm, data,
CLEAR_REAUTH_ID | CLEAR_EAP_ID);
}
os_free(decrypted);
return eap_aka_response_reauth(data, id, 0, data->nonce_s);
@ -1262,7 +1276,7 @@ static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
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);
eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
data->prev_id = -1;
wpabuf_free(data->id_msgs);
data->id_msgs = NULL;

3
src/eap_peer/eap_config.h
View file

@ -35,6 +35,9 @@ struct eap_peer_config {
*
* If not set, the identity field will be used for both unencrypted and
* protected fields.
*
* This field can also be used with EAP-SIM/AKA/AKA' to store the
* pseudonym identity.
*/
u8 *anonymous_identity;

31
src/eap_peer/eap_sim.c
View file

@ -1,6 +1,6 @@
/*
* EAP peer method: EAP-SIM (RFC 4186)
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -117,6 +117,15 @@ static void * eap_sim_init(struct eap_sm *sm)
NULL;
}
if (config && config->anonymous_identity) {
data->pseudonym = os_malloc(config->anonymous_identity_len);
if (data->pseudonym) {
os_memcpy(data->pseudonym, config->anonymous_identity,
config->anonymous_identity_len);
data->pseudonym_len = config->anonymous_identity_len;
}
}
eap_sim_state(data, CONTINUE);
return data;
@ -258,13 +267,15 @@ static int eap_sim_supported_ver(int version)
#define CLEAR_REAUTH_ID 0x02
#define CLEAR_EAP_ID 0x04
static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
static void eap_sim_clear_identities(struct eap_sm *sm,
struct eap_sim_data *data, int id)
{
if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
os_free(data->pseudonym);
data->pseudonym = NULL;
data->pseudonym_len = 0;
eap_set_anon_id(sm, NULL, 0);
}
if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
@ -319,6 +330,7 @@ static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
realm, realm_len);
}
data->pseudonym_len = attr->next_pseudonym_len + realm_len;
eap_set_anon_id(sm, data->pseudonym, data->pseudonym_len);
}
if (attr->next_reauth_id) {
@ -378,16 +390,16 @@ static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
data->pseudonym) {
identity = data->pseudonym;
identity_len = data->pseudonym_len;
eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
} else if (id_req != NO_ID_REQ) {
identity = eap_get_config_identity(sm, &identity_len);
if (identity) {
eap_sim_clear_identities(data, CLEAR_PSEUDONYM |
eap_sim_clear_identities(sm, data, CLEAR_PSEUDONYM |
CLEAR_REAUTH_ID);
}
}
if (id_req != NO_ID_REQ)
eap_sim_clear_identities(data, CLEAR_EAP_ID);
eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
@ -670,7 +682,7 @@ static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
* other words, if no new reauth identity is received, full
* authentication will be used on next reauthentication (using
* pseudonym identity or permanent identity). */
eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
if (attr->encr_data) {
u8 *decrypted;
@ -878,7 +890,7 @@ static struct wpabuf * eap_sim_process_reauthentication(
data->reauth_id, data->reauth_id_len,
data->nonce_s, data->mk, data->msk,
data->emsk);
eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_sim_learn_ids(sm, data, &eattr);
if (data->result_ind && attr->result_ind)
@ -894,7 +906,8 @@ static struct wpabuf * eap_sim_process_reauthentication(
if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
"fast reauths performed - force fullauth");
eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
eap_sim_clear_identities(sm, data,
CLEAR_REAUTH_ID | CLEAR_EAP_ID);
}
os_free(decrypted);
return eap_sim_response_reauth(data, id, 0, data->nonce_s);
@ -1005,7 +1018,7 @@ static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_sim_data *data = priv;
eap_sim_clear_identities(data, CLEAR_EAP_ID);
eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
data->use_result_ind = 0;
}

12
src/eapol_supp/eapol_supp_sm.c
View file

@ -1825,6 +1825,15 @@ static void eapol_sm_notify_status(void *ctx, const char *status,
}
static void eapol_sm_set_anon_id(void *ctx, const u8 *id, size_t len)
{
struct eapol_sm *sm = ctx;
if (sm->ctx->set_anon_id)
sm->ctx->set_anon_id(sm->ctx->ctx, id, len);
}
static struct eapol_callbacks eapol_cb =
{
eapol_sm_get_config,
@ -1838,7 +1847,8 @@ static struct eapol_callbacks eapol_cb =
eapol_sm_notify_pending,
eapol_sm_eap_param_needed,
eapol_sm_notify_cert,
eapol_sm_notify_status
eapol_sm_notify_status,
eapol_sm_set_anon_id
};

8
src/eapol_supp/eapol_supp_sm.h
View file

@ -239,6 +239,14 @@ struct eapol_ctx {
*/
void (*status_cb)(void *ctx, const char *status,
const char *parameter);
/**
* set_anon_id - Set or add anonymous identity
* @ctx: eapol_ctx from eap_peer_sm_init() call
* @id: Anonymous identity (e.g., EAP-SIM pseudonym)
* @len: Length of anonymous identity in octets
*/
void (*set_anon_id)(void *ctx, const u8 *id, size_t len);
};

32
wpa_supplicant/eapol_test.c
View file

@ -429,6 +429,37 @@ static void eapol_test_cert_cb(void *ctx, int depth, const char *subject,
}
static void eapol_test_set_anon_id(void *ctx, const u8 *id, size_t len)
{
struct eapol_test_data *e = ctx;
struct wpa_supplicant *wpa_s = e->wpa_s;
char *str;
int res;
wpa_hexdump_ascii(MSG_DEBUG, "EAP method updated anonymous_identity",
id, len);
if (wpa_s->current_ssid == NULL)
return;
if (id == NULL) {
if (wpa_config_set(wpa_s->current_ssid, "anonymous_identity",
"NULL", 0) < 0)
return;
} else {
str = os_malloc(len * 2 + 1);
if (str == NULL)
return;
wpa_snprintf_hex(str, len * 2 + 1, id, len);
res = wpa_config_set(wpa_s->current_ssid, "anonymous_identity",
str, 0);
os_free(str);
if (res < 0)
return;
}
}
static int test_eapol(struct eapol_test_data *e, struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
@ -456,6 +487,7 @@ static int test_eapol(struct eapol_test_data *e, struct wpa_supplicant *wpa_s,
ctx->pkcs11_module_path = wpa_s->conf->pkcs11_module_path;
ctx->cert_cb = eapol_test_cert_cb;
ctx->cert_in_cb = 1;
ctx->set_anon_id = eapol_test_set_anon_id;
wpa_s->eapol = eapol_sm_init(ctx);
if (wpa_s->eapol == NULL) {

3
wpa_supplicant/wpa_supplicant.conf
View file

@ -586,7 +586,8 @@ fast_reauth=1
# EAP-PSK/PAX/SAKE/GPSK.
# anonymous_identity: Anonymous identity string for EAP (to be used as the
# unencrypted identity with EAP types that support different tunnelled
# identity, e.g., EAP-TTLS)
# identity, e.g., EAP-TTLS). This field can also be used with
# EAP-SIM/AKA/AKA' to store the pseudonym identity.
# password: Password string for EAP. This field can include either the
# plaintext password (using ASCII or hex string) or a NtPasswordHash
# (16-byte MD4 hash of password) in hash:<32 hex digits> format.

41
wpa_supplicant/wpas_glue.c
View file

@ -1,6 +1,6 @@
/*
* WPA Supplicant - Glue code to setup EAPOL and RSN modules
* Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -729,6 +729,44 @@ static void wpa_supplicant_status_cb(void *ctx, const char *status,
wpas_notify_eap_status(wpa_s, status, parameter);
}
static void wpa_supplicant_set_anon_id(void *ctx, const u8 *id, size_t len)
{
struct wpa_supplicant *wpa_s = ctx;
char *str;
int res;
wpa_hexdump_ascii(MSG_DEBUG, "EAP method updated anonymous_identity",
id, len);
if (wpa_s->current_ssid == NULL)
return;
if (id == NULL) {
if (wpa_config_set(wpa_s->current_ssid, "anonymous_identity",
"NULL", 0) < 0)
return;
} else {
str = os_malloc(len * 2 + 1);
if (str == NULL)
return;
wpa_snprintf_hex(str, len * 2 + 1, id, len);
res = wpa_config_set(wpa_s->current_ssid, "anonymous_identity",
str, 0);
os_free(str);
if (res < 0)
return;
}
if (wpa_s->conf->update_config) {
res = wpa_config_write(wpa_s->confname, wpa_s->conf);
if (res) {
wpa_printf(MSG_DEBUG, "Failed to update config after "
"anonymous_id update");
}
}
}
#endif /* IEEE8021X_EAPOL */
@ -761,6 +799,7 @@ int wpa_supplicant_init_eapol(struct wpa_supplicant *wpa_s)
ctx->cb = wpa_supplicant_eapol_cb;
ctx->cert_cb = wpa_supplicant_cert_cb;
ctx->status_cb = wpa_supplicant_status_cb;
ctx->set_anon_id = wpa_supplicant_set_anon_id;
ctx->cb_ctx = wpa_s;
wpa_s->eapol = eapol_sm_init(ctx);
if (wpa_s->eapol == NULL) {