blob: 987af83f5c36132d05f3893542439fc7e51eeec1 [file] [log] [blame]
/*
* EAP peer method: EAP-EKE (RFC 6124)
* Copyright (c) 2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/random.h"
#include "eap_peer/eap_i.h"
#include "eap_common/eap_eke_common.h"
struct eap_eke_data {
enum {
IDENTITY, COMMIT, CONFIRM, SUCCESS, FAILURE
} state;
u8 msk[EAP_MSK_LEN];
u8 emsk[EAP_EMSK_LEN];
u8 *peerid;
size_t peerid_len;
u8 *serverid;
size_t serverid_len;
u8 dh_priv[EAP_EKE_MAX_DH_LEN];
struct eap_eke_session sess;
u8 nonce_p[EAP_EKE_MAX_NONCE_LEN];
u8 nonce_s[EAP_EKE_MAX_NONCE_LEN];
struct wpabuf *msgs;
u8 dhgroup; /* forced DH group or 0 to allow all supported */
u8 encr; /* forced encryption algorithm or 0 to allow all supported */
u8 prf; /* forced PRF or 0 to allow all supported */
u8 mac; /* forced MAC or 0 to allow all supported */
};
static const char * eap_eke_state_txt(int state)
{
switch (state) {
case IDENTITY:
return "IDENTITY";
case COMMIT:
return "COMMIT";
case CONFIRM:
return "CONFIRM";
case SUCCESS:
return "SUCCESS";
case FAILURE:
return "FAILURE";
default:
return "?";
}
}
static void eap_eke_state(struct eap_eke_data *data, int state)
{
wpa_printf(MSG_DEBUG, "EAP-EKE: %s -> %s",
eap_eke_state_txt(data->state), eap_eke_state_txt(state));
data->state = state;
}
static void eap_eke_deinit(struct eap_sm *sm, void *priv);
static void * eap_eke_init(struct eap_sm *sm)
{
struct eap_eke_data *data;
const u8 *identity, *password;
size_t identity_len, password_len;
const char *phase1;
password = eap_get_config_password(sm, &password_len);
if (!password) {
wpa_printf(MSG_INFO, "EAP-EKE: No password configured");
return NULL;
}
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
eap_eke_state(data, IDENTITY);
identity = eap_get_config_identity(sm, &identity_len);
if (identity) {
data->peerid = os_malloc(identity_len);
if (data->peerid == NULL) {
eap_eke_deinit(sm, data);
return NULL;
}
os_memcpy(data->peerid, identity, identity_len);
data->peerid_len = identity_len;
}
phase1 = eap_get_config_phase1(sm);
if (phase1) {
const char *pos;
pos = os_strstr(phase1, "dhgroup=");
if (pos) {
data->dhgroup = atoi(pos + 8);
wpa_printf(MSG_DEBUG, "EAP-EKE: Forced dhgroup %u",
data->dhgroup);
}
pos = os_strstr(phase1, "encr=");
if (pos) {
data->encr = atoi(pos + 5);
wpa_printf(MSG_DEBUG, "EAP-EKE: Forced encr %u",
data->encr);
}
pos = os_strstr(phase1, "prf=");
if (pos) {
data->prf = atoi(pos + 4);
wpa_printf(MSG_DEBUG, "EAP-EKE: Forced prf %u",
data->prf);
}
pos = os_strstr(phase1, "mac=");
if (pos) {
data->mac = atoi(pos + 4);
wpa_printf(MSG_DEBUG, "EAP-EKE: Forced mac %u",
data->mac);
}
}
return data;
}
static void eap_eke_deinit(struct eap_sm *sm, void *priv)
{
struct eap_eke_data *data = priv;
eap_eke_session_clean(&data->sess);
os_free(data->serverid);
os_free(data->peerid);
wpabuf_free(data->msgs);
bin_clear_free(data, sizeof(*data));
}
static struct wpabuf * eap_eke_build_msg(struct eap_eke_data *data, int id,
size_t length, u8 eke_exch)
{
struct wpabuf *msg;
size_t plen;
plen = 1 + length;
msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EKE, plen,
EAP_CODE_RESPONSE, id);
if (msg == NULL) {
wpa_printf(MSG_ERROR, "EAP-EKE: Failed to allocate memory");
return NULL;
}
wpabuf_put_u8(msg, eke_exch);
return msg;
}
static int eap_eke_supp_dhgroup(u8 dhgroup)
{
return dhgroup == EAP_EKE_DHGROUP_EKE_2 ||
dhgroup == EAP_EKE_DHGROUP_EKE_5 ||
dhgroup == EAP_EKE_DHGROUP_EKE_14 ||
dhgroup == EAP_EKE_DHGROUP_EKE_15 ||
dhgroup == EAP_EKE_DHGROUP_EKE_16;
}
static int eap_eke_supp_encr(u8 encr)
{
return encr == EAP_EKE_ENCR_AES128_CBC;
}
static int eap_eke_supp_prf(u8 prf)
{
return prf == EAP_EKE_PRF_HMAC_SHA1 ||
prf == EAP_EKE_PRF_HMAC_SHA2_256;
}
static int eap_eke_supp_mac(u8 mac)
{
return mac == EAP_EKE_MAC_HMAC_SHA1 ||
mac == EAP_EKE_MAC_HMAC_SHA2_256;
}
static struct wpabuf * eap_eke_build_fail(struct eap_eke_data *data,
struct eap_method_ret *ret,
u8 id, u32 failure_code)
{
struct wpabuf *resp;
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x",
failure_code);
resp = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE);
if (resp)
wpabuf_put_be32(resp, failure_code);
os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
eap_eke_session_clean(&data->sess);
eap_eke_state(data, FAILURE);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
return resp;
}
static struct wpabuf * eap_eke_process_id(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
unsigned num_prop, i;
const u8 *pos, *end;
const u8 *prop = NULL;
u8 idtype;
u8 id = eap_get_id(reqData);
if (data->state != IDENTITY) {
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request");
if (payload_len < 2 + 4) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
pos = payload;
end = payload + payload_len;
num_prop = *pos++;
pos++; /* Ignore Reserved field */
if (pos + num_prop * 4 > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data (num_prop=%u)",
num_prop);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
for (i = 0; i < num_prop; i++) {
const u8 *tmp = pos;
wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u",
i, pos[0], pos[1], pos[2], pos[3]);
pos += 4;
if ((data->dhgroup && data->dhgroup != *tmp) ||
!eap_eke_supp_dhgroup(*tmp))
continue;
tmp++;
if ((data->encr && data->encr != *tmp) ||
!eap_eke_supp_encr(*tmp))
continue;
tmp++;
if ((data->prf && data->prf != *tmp) ||
!eap_eke_supp_prf(*tmp))
continue;
tmp++;
if ((data->mac && data->mac != *tmp) ||
!eap_eke_supp_mac(*tmp))
continue;
prop = tmp - 3;
if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2],
prop[3]) < 0) {
prop = NULL;
continue;
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal");
break;
}
if (prop == NULL) {
wpa_printf(MSG_DEBUG, "EAP-EKE: No acceptable proposal found");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN);
}
pos += (num_prop - i - 1) * 4;
if (pos == end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data to include IDType/Identity");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
idtype = *pos++;
wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity",
pos, end - pos);
os_free(data->serverid);
data->serverid = os_malloc(end - pos);
if (data->serverid == NULL) {
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memcpy(data->serverid, pos, end - pos);
data->serverid_len = end - pos;
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response");
resp = eap_eke_build_msg(data, id,
2 + 4 + 1 + data->peerid_len,
EAP_EKE_ID);
if (resp == NULL) {
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_u8(resp, 1); /* NumProposals */
wpabuf_put_u8(resp, 0); /* Reserved */
wpabuf_put_data(resp, prop, 4); /* Selected Proposal */
wpabuf_put_u8(resp, EAP_EKE_ID_NAI);
if (data->peerid)
wpabuf_put_data(resp, data->peerid, data->peerid_len);
wpabuf_free(data->msgs);
data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp));
if (data->msgs == NULL) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_buf(data->msgs, reqData);
wpabuf_put_buf(data->msgs, resp);
eap_eke_state(data, COMMIT);
return resp;
}
static struct wpabuf * eap_eke_process_commit(struct eap_sm *sm,
struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
const u8 *pos, *end, *dhcomp;
size_t prot_len;
u8 *rpos;
u8 key[EAP_EKE_MAX_KEY_LEN];
u8 pub[EAP_EKE_MAX_DH_LEN];
const u8 *password;
size_t password_len;
u8 id = eap_get_id(reqData);
if (data->state != COMMIT) {
wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Commit/Request received in unexpected state (%d)", data->state);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request");
password = eap_get_config_password(sm, &password_len);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-EKE: No password configured!");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PASSWD_NOT_FOUND);
}
pos = payload;
end = payload + payload_len;
if (pos + data->sess.dhcomp_len > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S",
pos, data->sess.dhcomp_len);
dhcomp = pos;
pos += data->sess.dhcomp_len;
wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos);
/*
* temp = prf(0+, password)
* key = prf+(temp, ID_S | ID_P)
*/
if (eap_eke_derive_key(&data->sess, password, password_len,
data->serverid, data->serverid_len,
data->peerid, data->peerid_len, key) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
/*
* y_p = g ^ x_p (mod p)
* x_p = random number 2 .. p-1
*/
if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0)
{
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_derive_ke_ki(&data->sess,
data->serverid, data->serverid_len,
data->peerid, data->peerid_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response");
resp = eap_eke_build_msg(data, id,
data->sess.dhcomp_len + data->sess.pnonce_len,
EAP_EKE_COMMIT);
if (resp == NULL) {
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
/* DHComponent_P = Encr(key, y_p) */
rpos = wpabuf_put(resp, data->sess.dhcomp_len);
if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_P");
os_memset(key, 0, sizeof(key));
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memset(key, 0, sizeof(key));
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
rpos, data->sess.dhcomp_len);
if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
data->nonce_p, data->sess.nonce_len);
prot_len = wpabuf_tailroom(resp);
if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len,
wpabuf_put(resp, 0), &prot_len) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P",
wpabuf_put(resp, 0), prot_len);
wpabuf_put(resp, prot_len);
/* TODO: CBValue */
if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp))
< 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put_buf(data->msgs, reqData);
wpabuf_put_buf(data->msgs, resp);
eap_eke_state(data, CONFIRM);
return resp;
}
static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
struct wpabuf *resp;
const u8 *pos, *end;
size_t prot_len;
u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
u8 auth_s[EAP_EKE_MAX_HASH_LEN];
size_t decrypt_len;
u8 *auth;
u8 id = eap_get_id(reqData);
if (data->state != CONFIRM) {
wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)",
data->state);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request");
pos = payload;
end = payload + payload_len;
if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PROTO_ERROR);
}
decrypt_len = sizeof(nonces);
if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len,
nonces, &decrypt_len) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
if (decrypt_len != (size_t) 2 * data->sess.nonce_len) {
wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S",
nonces, 2 * data->sess.nonce_len);
if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match transmitted Nonce_P");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
os_memcpy(data->nonce_s, nonces + data->sess.nonce_len,
data->sess.nonce_len);
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
data->nonce_s, data->sess.nonce_len);
if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len,
data->peerid, data->peerid_len,
data->nonce_p, data->nonce_s) < 0) {
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0)
{
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len);
if (os_memcmp_const(auth_s, pos + data->sess.pnonce_ps_len,
data->sess.prf_len) != 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match");
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_AUTHENTICATION_FAIL);
}
wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response");
resp = eap_eke_build_msg(data, id,
data->sess.pnonce_len + data->sess.prf_len,
EAP_EKE_CONFIRM);
if (resp == NULL) {
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
prot_len = wpabuf_tailroom(resp);
if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len,
wpabuf_put(resp, 0), &prot_len) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpabuf_put(resp, prot_len);
auth = wpabuf_put(resp, data->sess.prf_len);
if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) {
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len);
if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len,
data->peerid, data->peerid_len,
data->nonce_s, data->nonce_p,
data->msk, data->emsk) < 0) {
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK");
wpabuf_free(resp);
return eap_eke_build_fail(data, ret, id,
EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
}
os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
eap_eke_session_clean(&data->sess);
eap_eke_state(data, SUCCESS);
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
ret->allowNotifications = FALSE;
return resp;
}
static struct wpabuf * eap_eke_process_failure(struct eap_eke_data *data,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
const u8 *payload,
size_t payload_len)
{
wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Failure/Request");
if (payload_len < 4) {
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
} else {
u32 code;
code = WPA_GET_BE32(payload);
wpa_printf(MSG_INFO, "EAP-EKE: Failure-Code 0x%x", code);
}
return eap_eke_build_fail(data, ret, eap_get_id(reqData),
EAP_EKE_FAIL_NO_ERROR);
}
static struct wpabuf * eap_eke_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct eap_eke_data *data = priv;
struct wpabuf *resp;
const u8 *pos, *end;
size_t len;
u8 eke_exch;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, reqData, &len);
if (pos == NULL || len < 1) {
ret->ignore = TRUE;
return NULL;
}
end = pos + len;
eke_exch = *pos++;
wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: exch %d", eke_exch);
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received Data", pos, end - pos);
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
ret->allowNotifications = TRUE;
switch (eke_exch) {
case EAP_EKE_ID:
resp = eap_eke_process_id(data, ret, reqData, pos, end - pos);
break;
case EAP_EKE_COMMIT:
resp = eap_eke_process_commit(sm, data, ret, reqData,
pos, end - pos);
break;
case EAP_EKE_CONFIRM:
resp = eap_eke_process_confirm(data, ret, reqData,
pos, end - pos);
break;
case EAP_EKE_FAILURE:
resp = eap_eke_process_failure(data, ret, reqData,
pos, end - pos);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-EKE: Ignoring message with unknown EKE-Exch %d", eke_exch);
ret->ignore = TRUE;
return NULL;
}
if (ret->methodState == METHOD_DONE)
ret->allowNotifications = FALSE;
return resp;
}
static Boolean eap_eke_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_eke_data *data = priv;
return data->state == SUCCESS;
}
static u8 * eap_eke_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_eke_data *data = priv;
u8 *key;
if (data->state != SUCCESS)
return NULL;
key = os_malloc(EAP_MSK_LEN);
if (key == NULL)
return NULL;
os_memcpy(key, data->msk, EAP_MSK_LEN);
*len = EAP_MSK_LEN;
return key;
}
static u8 * eap_eke_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_eke_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;
}
int eap_peer_eke_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_EKE, "EKE");
if (eap == NULL)
return -1;
eap->init = eap_eke_init;
eap->deinit = eap_eke_deinit;
eap->process = eap_eke_process;
eap->isKeyAvailable = eap_eke_isKeyAvailable;
eap->getKey = eap_eke_getKey;
eap->get_emsk = eap_eke_get_emsk;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}