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EAP-AKA/AKA' peer: Allow external USIM processing to be used

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This allows the new external_sim=1 case to be used to perform UMTS
authentication step in EAP-AKA/AKA' peer process. Following control
interface event is used to request the operation:

CTRL-REQ-SIM-<network id>:UMTS-AUTH:<RAND>:<AUTN> needed for SSID <SSID>

Response from external processing is returned with
CTRL-RSP-SIM-<network id> UMTS-AUTH:<IK>:<CK>:<RES>
or
CTRL-RSP-SIM-<network id> UMTS-AUTS:<AUTS>

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2013-10-20 00:01:24 +03:00
parent 569ccf719f
commit db13605816
1 changed files with 94 additions and 0 deletions
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94
src/eap_peer/eap_aka.c
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@ -142,6 +142,89 @@ static void eap_aka_deinit(struct eap_sm *sm, void *priv)
}
static int eap_aka_ext_sim_req(struct eap_sm *sm, struct eap_aka_data *data)
{
char req[200], *pos, *end;
wpa_printf(MSG_DEBUG, "EAP-AKA: Use external USIM processing");
pos = req;
end = pos + sizeof(req);
pos += os_snprintf(pos, end - pos, "UMTS-AUTH");
pos += os_snprintf(pos, end - pos, ":");
pos += wpa_snprintf_hex(pos, end - pos, data->rand, EAP_AKA_RAND_LEN);
pos += os_snprintf(pos, end - pos, ":");
pos += wpa_snprintf_hex(pos, end - pos, data->autn, EAP_AKA_AUTN_LEN);
eap_sm_request_sim(sm, req);
return 1;
}
static int eap_aka_ext_sim_result(struct eap_sm *sm, struct eap_aka_data *data,
struct eap_peer_config *conf)
{
char *resp, *pos;
wpa_printf(MSG_DEBUG,
"EAP-AKA: Use result from external USIM processing");
resp = conf->external_sim_resp;
conf->external_sim_resp = NULL;
if (os_strncmp(resp, "UMTS-AUTS:", 10) == 0) {
pos = resp + 10;
if (hexstr2bin(pos, data->auts, EAP_AKA_AUTS_LEN) < 0)
goto invalid;
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: AUTS", data->auts,
EAP_AKA_AUTS_LEN);
os_free(resp);
return -2;
}
if (os_strncmp(resp, "UMTS-AUTH:", 10) != 0) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized external USIM processing response");
os_free(resp);
return -1;
}
pos = resp + 10;
wpa_hexdump(MSG_DEBUG, "EAP-AKA: RAND", data->rand, EAP_AKA_RAND_LEN);
if (hexstr2bin(pos, data->ik, EAP_AKA_IK_LEN) < 0)
goto invalid;
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", data->ik, EAP_AKA_IK_LEN);
pos += EAP_AKA_IK_LEN * 2;
if (*pos != ':')
goto invalid;
pos++;
if (hexstr2bin(pos, data->ck, EAP_AKA_CK_LEN) < 0)
goto invalid;
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", data->ck, EAP_AKA_CK_LEN);
pos += EAP_AKA_CK_LEN * 2;
if (*pos != ':')
goto invalid;
pos++;
data->res_len = os_strlen(pos) / 2;
if (data->res_len > EAP_AKA_RES_MAX_LEN) {
data->res_len = 0;
goto invalid;
}
if (hexstr2bin(pos, data->res, data->res_len) < 0)
goto invalid;
wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: RES", data->res, data->res_len);
os_free(resp);
return 0;
invalid:
wpa_printf(MSG_DEBUG, "EAP-AKA: Invalid external USIM processing UMTS-AUTH response");
os_free(resp);
return -1;
}
static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
{
struct eap_peer_config *conf;
@ -151,6 +234,14 @@ static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
conf = eap_get_config(sm);
if (conf == NULL)
return -1;
if (sm->external_sim) {
if (conf->external_sim_resp)
return eap_aka_ext_sim_result(sm, data, conf);
else
return eap_aka_ext_sim_req(sm, data);
}
if (conf->pcsc) {
return scard_umts_auth(sm->scard_ctx, data->rand,
data->autn, data->res, &data->res_len,
@ -861,6 +952,9 @@ static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
"failed (AUTN seq# -> AUTS)");
return eap_aka_synchronization_failure(data, id);
} else if (res > 0) {
wpa_printf(MSG_DEBUG, "EAP-AKA: Wait for external USIM processing");
return NULL;
} else if (res) {
wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
return eap_aka_client_error(data, id,