EAP-EKE: Add server implementation
This adds a new password-based EAP method defined in RFC 6124. Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
parent
7e7610d788
commit
fe65847bb1
6 changed files with 816 additions and 0 deletions
|
|
@ -356,6 +356,13 @@ OBJS += src/eap_server/eap_server_pwd.c src/eap_common/eap_pwd_common.c
|
|||
NEED_SHA256=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_EAP_EKE
|
||||
L_CFLAGS += -DEAP_SERVER_EKE
|
||||
OBJS += src/eap_server/eap_server_eke.c src/eap_common/eap_eke_common.c
|
||||
NEED_DH_GROUPS=y
|
||||
NEED_DH_GROUPS_ALL=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_EAP_VENDOR_TEST
|
||||
L_CFLAGS += -DEAP_SERVER_VENDOR_TEST
|
||||
OBJS += src/eap_server/eap_server_vendor_test.c
|
||||
|
|
|
|||
|
|
@ -323,6 +323,13 @@ OBJS += ../src/eap_server/eap_server_pwd.o ../src/eap_common/eap_pwd_common.o
|
|||
NEED_SHA256=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_EAP_EKE
|
||||
CFLAGS += -DEAP_SERVER_EKE
|
||||
OBJS += ../src/eap_server/eap_server_eke.o ../src/eap_common/eap_eke_common.o
|
||||
NEED_DH_GROUPS=y
|
||||
NEED_DH_GROUPS_ALL=y
|
||||
endif
|
||||
|
||||
ifdef CONFIG_EAP_VENDOR_TEST
|
||||
CFLAGS += -DEAP_SERVER_VENDOR_TEST
|
||||
OBJS += ../src/eap_server/eap_server_vendor_test.o
|
||||
|
|
|
|||
|
|
@ -117,6 +117,9 @@ CONFIG_EAP_TTLS=y
|
|||
# Trusted Network Connect (EAP-TNC)
|
||||
#CONFIG_EAP_TNC=y
|
||||
|
||||
# EAP-EKE for the integrated EAP server
|
||||
#CONFIG_EAP_EKE=y
|
||||
|
||||
# PKCS#12 (PFX) support (used to read private key and certificate file from
|
||||
# a file that usually has extension .p12 or .pfx)
|
||||
CONFIG_PKCS12=y
|
||||
|
|
|
|||
|
|
@ -134,5 +134,10 @@ int eap_server_register_methods(void)
|
|||
ret = eap_server_pwd_register();
|
||||
#endif /* EAP_SERVER_PWD */
|
||||
|
||||
#ifdef EAP_SERVER_EKE
|
||||
if (ret == 0)
|
||||
ret = eap_server_eke_register();
|
||||
#endif /* EAP_SERVER_EKE */
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -45,5 +45,6 @@ int eap_server_wsc_register(void);
|
|||
int eap_server_ikev2_register(void);
|
||||
int eap_server_tnc_register(void);
|
||||
int eap_server_pwd_register(void);
|
||||
int eap_server_eke_register(void);
|
||||
|
||||
#endif /* EAP_SERVER_METHODS_H */
|
||||
|
|
|
|||
793
src/eap_server/eap_server_eke.c
Normal file
793
src/eap_server/eap_server_eke.c
Normal file
|
|
@ -0,0 +1,793 @@
|
|||
/*
|
||||
* hostapd / EAP-EKE (RFC 6124) server
|
||||
* 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_server/eap_i.h"
|
||||
#include "eap_common/eap_eke_common.h"
|
||||
|
||||
|
||||
struct eap_eke_data {
|
||||
enum {
|
||||
IDENTITY, COMMIT, CONFIRM, FAILURE_REPORT, SUCCESS, FAILURE
|
||||
} state;
|
||||
u8 msk[EAP_MSK_LEN];
|
||||
u8 emsk[EAP_EMSK_LEN];
|
||||
u8 *peerid;
|
||||
size_t peerid_len;
|
||||
u8 peerid_type;
|
||||
u8 serverid_type;
|
||||
u8 dh_priv[EAP_EKE_MAX_DH_LEN];
|
||||
u8 key[EAP_EKE_MAX_KEY_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;
|
||||
int phase2;
|
||||
u32 failure_code;
|
||||
};
|
||||
|
||||
|
||||
static const char * eap_eke_state_txt(int state)
|
||||
{
|
||||
switch (state) {
|
||||
case IDENTITY:
|
||||
return "IDENTITY";
|
||||
case COMMIT:
|
||||
return "COMMIT";
|
||||
case CONFIRM:
|
||||
return "CONFIRM";
|
||||
case FAILURE_REPORT:
|
||||
return "FAILURE_REPORT";
|
||||
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_fail(struct eap_eke_data *data, u32 code)
|
||||
{
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Failure - code 0x%x", code);
|
||||
data->failure_code = code;
|
||||
eap_eke_state(data, FAILURE_REPORT);
|
||||
}
|
||||
|
||||
|
||||
static void * eap_eke_init(struct eap_sm *sm)
|
||||
{
|
||||
struct eap_eke_data *data;
|
||||
size_t i;
|
||||
|
||||
data = os_zalloc(sizeof(*data));
|
||||
if (data == NULL)
|
||||
return NULL;
|
||||
eap_eke_state(data, IDENTITY);
|
||||
|
||||
data->serverid_type = EAP_EKE_ID_OPAQUE;
|
||||
for (i = 0; i < sm->server_id_len; i++) {
|
||||
if (sm->server_id[i] == '.' &&
|
||||
data->serverid_type == EAP_EKE_ID_OPAQUE)
|
||||
data->serverid_type = EAP_EKE_ID_FQDN;
|
||||
if (sm->server_id[i] == '@')
|
||||
data->serverid_type = EAP_EKE_ID_NAI;
|
||||
}
|
||||
|
||||
data->phase2 = sm->init_phase2;
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_reset(struct eap_sm *sm, void *priv)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
eap_eke_session_clean(&data->sess);
|
||||
os_free(data->peerid);
|
||||
wpabuf_free(data->msgs);
|
||||
os_free(data);
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_build_msg(struct eap_eke_data *data,
|
||||
u8 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_REQUEST, 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 supported_proposal(const u8 *pos)
|
||||
{
|
||||
if (pos[0] == EAP_EKE_DHGROUP_EKE_16 &&
|
||||
pos[1] == EAP_EKE_ENCR_AES128_CBC &&
|
||||
pos[2] == EAP_EKE_PRF_HMAC_SHA2_256 &&
|
||||
pos[3] == EAP_EKE_MAC_HMAC_SHA2_256)
|
||||
return 1;
|
||||
|
||||
if (pos[0] == EAP_EKE_DHGROUP_EKE_15 &&
|
||||
pos[1] == EAP_EKE_ENCR_AES128_CBC &&
|
||||
pos[2] == EAP_EKE_PRF_HMAC_SHA2_256 &&
|
||||
pos[3] == EAP_EKE_MAC_HMAC_SHA2_256)
|
||||
return 1;
|
||||
|
||||
if (pos[0] == EAP_EKE_DHGROUP_EKE_14 &&
|
||||
pos[1] == EAP_EKE_ENCR_AES128_CBC &&
|
||||
pos[2] == EAP_EKE_PRF_HMAC_SHA2_256 &&
|
||||
pos[3] == EAP_EKE_MAC_HMAC_SHA2_256)
|
||||
return 1;
|
||||
|
||||
if (pos[0] == EAP_EKE_DHGROUP_EKE_14 &&
|
||||
pos[1] == EAP_EKE_ENCR_AES128_CBC &&
|
||||
pos[2] == EAP_EKE_PRF_HMAC_SHA1 &&
|
||||
pos[3] == EAP_EKE_MAC_HMAC_SHA1)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_build_failure(struct eap_eke_data *data, u8 id)
|
||||
{
|
||||
struct wpabuf *msg;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Failure: Failure-Code=0x%x",
|
||||
data->failure_code);
|
||||
|
||||
msg = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE);
|
||||
if (msg == NULL) {
|
||||
eap_eke_state(data, FAILURE);
|
||||
return NULL;
|
||||
}
|
||||
wpabuf_put_be32(msg, data->failure_code);
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_build_identity(struct eap_sm *sm,
|
||||
struct eap_eke_data *data,
|
||||
u8 id)
|
||||
{
|
||||
struct wpabuf *msg;
|
||||
size_t plen;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Identity");
|
||||
|
||||
plen = 2 + 4 * 4 + 1 + sm->server_id_len;
|
||||
msg = eap_eke_build_msg(data, id, plen, EAP_EKE_ID);
|
||||
if (msg == NULL)
|
||||
return NULL;
|
||||
|
||||
wpabuf_put_u8(msg, 4); /* NumProposals */
|
||||
wpabuf_put_u8(msg, 0); /* Reserved */
|
||||
|
||||
/* Proposal - DH Group 16 with AES128-CBC and SHA256 */
|
||||
wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_16); /* Group Description */
|
||||
wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */
|
||||
wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */
|
||||
wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */
|
||||
|
||||
/* Proposal - DH Group 15 with AES128-CBC and SHA256 */
|
||||
wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_15); /* Group Description */
|
||||
wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */
|
||||
wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */
|
||||
wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */
|
||||
|
||||
/* Proposal - DH Group 14 with AES128-CBC and SHA256 */
|
||||
wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_14); /* Group Description */
|
||||
wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */
|
||||
wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */
|
||||
wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */
|
||||
|
||||
/*
|
||||
* Proposal - DH Group 14 with AES128-CBC and SHA1
|
||||
* (mandatory to implement algorithms)
|
||||
*/
|
||||
wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_14); /* Group Description */
|
||||
wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */
|
||||
wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA1); /* PRF */
|
||||
wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA1); /* MAC */
|
||||
|
||||
/* Server IDType + Identity */
|
||||
wpabuf_put_u8(msg, data->serverid_type);
|
||||
wpabuf_put_data(msg, sm->server_id, sm->server_id_len);
|
||||
|
||||
wpabuf_free(data->msgs);
|
||||
data->msgs = wpabuf_dup(msg);
|
||||
if (data->msgs == NULL) {
|
||||
wpabuf_free(msg);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_build_commit(struct eap_sm *sm,
|
||||
struct eap_eke_data *data, u8 id)
|
||||
{
|
||||
struct wpabuf *msg;
|
||||
u8 pub[EAP_EKE_MAX_DH_LEN];
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Commit");
|
||||
|
||||
if (sm->user == NULL || sm->user->password == NULL) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Password with not configured");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PASSWD_NOT_FOUND);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
if (eap_eke_derive_key(&data->sess, sm->user->password,
|
||||
sm->user->password_len,
|
||||
sm->server_id, sm->server_id_len,
|
||||
data->peerid, data->peerid_len, data->key) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
msg = eap_eke_build_msg(data, id, data->sess.dhcomp_len,
|
||||
EAP_EKE_COMMIT);
|
||||
if (msg == NULL) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
/*
|
||||
* y_s = g ^ x_s (mod p)
|
||||
* x_s = random number 2 .. p-1
|
||||
* temp = prf(0+, password)
|
||||
* key = prf+(temp, ID_S | ID_P)
|
||||
* DHComponent_S = Encr(key, y_s)
|
||||
*/
|
||||
|
||||
if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
if (eap_eke_dhcomp(&data->sess, data->key, pub,
|
||||
wpabuf_put(msg, data->sess.dhcomp_len))
|
||||
< 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_S");
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
if (wpabuf_resize(&data->msgs, wpabuf_len(msg)) < 0) {
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
wpabuf_put_buf(data->msgs, msg);
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_build_confirm(struct eap_sm *sm,
|
||||
struct eap_eke_data *data, u8 id)
|
||||
{
|
||||
struct wpabuf *msg;
|
||||
size_t plen, prot_len;
|
||||
u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
|
||||
u8 *auth;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Confirm");
|
||||
|
||||
plen = data->sess.pnonce_ps_len + data->sess.prf_len;
|
||||
msg = eap_eke_build_msg(data, id, plen, EAP_EKE_CONFIRM);
|
||||
if (msg == NULL) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
if (random_get_bytes(data->nonce_s, data->sess.nonce_len)) {
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
|
||||
data->nonce_s, data->sess.nonce_len);
|
||||
|
||||
os_memcpy(nonces, data->nonce_p, data->sess.nonce_len);
|
||||
os_memcpy(nonces + data->sess.nonce_len, data->nonce_s,
|
||||
data->sess.nonce_len);
|
||||
prot_len = wpabuf_tailroom(msg);
|
||||
if (eap_eke_prot(&data->sess, nonces, 2 * data->sess.nonce_len,
|
||||
wpabuf_put(msg, 0), &prot_len) < 0) {
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
wpabuf_put(msg, prot_len);
|
||||
|
||||
if (eap_eke_derive_ka(&data->sess,
|
||||
sm->server_id, sm->server_id_len,
|
||||
data->peerid, data->peerid_len,
|
||||
data->nonce_p, data->nonce_s) < 0) {
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
|
||||
auth = wpabuf_put(msg, data->sess.prf_len);
|
||||
if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth) < 0) {
|
||||
wpabuf_free(msg);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return eap_eke_build_failure(data, id);
|
||||
}
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth, data->sess.prf_len);
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
|
||||
static struct wpabuf * eap_eke_buildReq(struct eap_sm *sm, void *priv, u8 id)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
|
||||
switch (data->state) {
|
||||
case IDENTITY:
|
||||
return eap_eke_build_identity(sm, data, id);
|
||||
case COMMIT:
|
||||
return eap_eke_build_commit(sm, data, id);
|
||||
case CONFIRM:
|
||||
return eap_eke_build_confirm(sm, data, id);
|
||||
case FAILURE_REPORT:
|
||||
return eap_eke_build_failure(data, id);
|
||||
default:
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Unknown state %d in buildReq",
|
||||
data->state);
|
||||
break;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
||||
static Boolean eap_eke_check(struct eap_sm *sm, void *priv,
|
||||
struct wpabuf *respData)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
size_t len;
|
||||
const u8 *pos;
|
||||
u8 eke_exch;
|
||||
|
||||
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, respData, &len);
|
||||
if (pos == NULL || len < 1) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Invalid frame");
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
eke_exch = *pos;
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: EKE-Exch=%d", eke_exch);
|
||||
|
||||
if (data->state == IDENTITY && eke_exch == EAP_EKE_ID)
|
||||
return FALSE;
|
||||
|
||||
if (data->state == COMMIT && eke_exch == EAP_EKE_COMMIT)
|
||||
return FALSE;
|
||||
|
||||
if (data->state == CONFIRM && eke_exch == EAP_EKE_CONFIRM)
|
||||
return FALSE;
|
||||
|
||||
if (eke_exch == EAP_EKE_FAILURE)
|
||||
return FALSE;
|
||||
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Unexpected EKE-Exch=%d in state=%d",
|
||||
eke_exch, data->state);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_process_identity(struct eap_sm *sm,
|
||||
struct eap_eke_data *data,
|
||||
const struct wpabuf *respData,
|
||||
const u8 *payload, size_t payloadlen)
|
||||
{
|
||||
const u8 *pos, *end;
|
||||
int i;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received Response/Identity");
|
||||
|
||||
if (data->state != IDENTITY) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
pos = payload;
|
||||
end = payload + payloadlen;
|
||||
|
||||
if (pos + 2 + 4 + 1 > end) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Too short EAP-EKE-ID payload");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
if (*pos != 1) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Unexpected NumProposals %d (expected 1)",
|
||||
*pos);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
pos += 2;
|
||||
|
||||
if (!supported_proposal(pos)) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Unexpected Proposal (%u:%u:%u:%u)",
|
||||
pos[0], pos[1], pos[2], pos[3]);
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Selected Proposal (%u:%u:%u:%u)",
|
||||
pos[0], pos[1], pos[2], pos[3]);
|
||||
if (eap_eke_session_init(&data->sess, pos[0], pos[1], pos[2], pos[3]) <
|
||||
0) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
pos += 4;
|
||||
|
||||
data->peerid_type = *pos++;
|
||||
os_free(data->peerid);
|
||||
data->peerid = os_malloc(end - pos);
|
||||
if (data->peerid == NULL) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to allocate memory for peerid");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
os_memcpy(data->peerid, pos, end - pos);
|
||||
data->peerid_len = end - pos;
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Peer IDType %u", data->peerid_type);
|
||||
wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Peer Identity",
|
||||
data->peerid, data->peerid_len);
|
||||
|
||||
if (eap_user_get(sm, data->peerid, data->peerid_len, data->phase2)) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Peer Identity not found from user database");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PASSWD_NOT_FOUND);
|
||||
return;
|
||||
}
|
||||
|
||||
for (i = 0; i < EAP_MAX_METHODS; i++) {
|
||||
if (sm->user->methods[i].vendor == EAP_VENDOR_IETF &&
|
||||
sm->user->methods[i].method == EAP_TYPE_EKE)
|
||||
break;
|
||||
}
|
||||
if (i == EAP_MAX_METHODS) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Matching user entry does not allow EAP-EKE");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PASSWD_NOT_FOUND);
|
||||
return;
|
||||
}
|
||||
|
||||
if (sm->user->password == NULL || sm->user->password_len == 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: No password configured for peer");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PASSWD_NOT_FOUND);
|
||||
return;
|
||||
}
|
||||
|
||||
if (wpabuf_resize(&data->msgs, wpabuf_len(respData)) < 0) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
wpabuf_put_buf(data->msgs, respData);
|
||||
|
||||
eap_eke_state(data, COMMIT);
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_process_commit(struct eap_sm *sm,
|
||||
struct eap_eke_data *data,
|
||||
const struct wpabuf *respData,
|
||||
const u8 *payload, size_t payloadlen)
|
||||
{
|
||||
const u8 *pos, *end, *dhcomp, *pnonce;
|
||||
size_t decrypt_len;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received Response/Commit");
|
||||
|
||||
if (data->state != COMMIT) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
pos = payload;
|
||||
end = payload + payloadlen;
|
||||
|
||||
if (pos + data->sess.dhcomp_len + data->sess.pnonce_len > end) {
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
|
||||
pos, data->sess.dhcomp_len);
|
||||
dhcomp = pos;
|
||||
pos += data->sess.dhcomp_len;
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P", pos, data->sess.pnonce_len);
|
||||
pnonce = pos;
|
||||
pos += data->sess.pnonce_len;
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos);
|
||||
|
||||
if (eap_eke_shared_secret(&data->sess, data->key, data->dh_priv, dhcomp)
|
||||
< 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
if (eap_eke_derive_ke_ki(&data->sess,
|
||||
sm->server_id, sm->server_id_len,
|
||||
data->peerid, data->peerid_len) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
decrypt_len = sizeof(data->nonce_p);
|
||||
if (eap_eke_decrypt_prot(&data->sess, pnonce, data->sess.pnonce_len,
|
||||
data->nonce_p, &decrypt_len) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_P");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
if (decrypt_len < (size_t) data->sess.nonce_len) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: PNonce_P protected data too short to include Nonce_P");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
|
||||
data->nonce_p, data->sess.nonce_len);
|
||||
|
||||
if (wpabuf_resize(&data->msgs, wpabuf_len(respData)) < 0) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
wpabuf_put_buf(data->msgs, respData);
|
||||
|
||||
eap_eke_state(data, CONFIRM);
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_process_confirm(struct eap_sm *sm,
|
||||
struct eap_eke_data *data,
|
||||
const struct wpabuf *respData,
|
||||
const u8 *payload, size_t payloadlen)
|
||||
{
|
||||
size_t decrypt_len;
|
||||
u8 nonce[EAP_EKE_MAX_NONCE_LEN];
|
||||
u8 auth_p[EAP_EKE_MAX_HASH_LEN];
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received Response/Confirm");
|
||||
|
||||
if (data->state != CONFIRM) {
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received Response/Confirm");
|
||||
|
||||
if (payloadlen < (size_t) data->sess.pnonce_len + data->sess.prf_len) {
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PROTO_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
decrypt_len = sizeof(nonce);
|
||||
if (eap_eke_decrypt_prot(&data->sess, payload, data->sess.pnonce_len,
|
||||
nonce, &decrypt_len) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_S");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
if (decrypt_len < (size_t) data->sess.nonce_len) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: PNonce_S protected data too short to include Nonce_S");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_S",
|
||||
nonce, data->sess.nonce_len);
|
||||
if (os_memcmp(nonce, data->nonce_s, data->sess.nonce_len) != 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_S does not match previously sent Nonce_S");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
|
||||
if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth_p) < 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Could not derive Auth_P");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth_p, data->sess.prf_len);
|
||||
if (os_memcmp(auth_p, payload + data->sess.pnonce_len,
|
||||
data->sess.prf_len) != 0) {
|
||||
wpa_printf(MSG_INFO, "EAP-EKE: Auth_P does not match");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_AUTHENTICATION_FAIL);
|
||||
return;
|
||||
}
|
||||
|
||||
if (eap_eke_derive_msk(&data->sess, sm->server_id, sm->server_id_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");
|
||||
eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
|
||||
return;
|
||||
}
|
||||
|
||||
os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
|
||||
os_memset(data->key, 0, sizeof(data->key));
|
||||
eap_eke_session_clean(&data->sess);
|
||||
|
||||
eap_eke_state(data, SUCCESS);
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_process_failure(struct eap_sm *sm,
|
||||
struct eap_eke_data *data,
|
||||
const struct wpabuf *respData,
|
||||
const u8 *payload, size_t payloadlen)
|
||||
{
|
||||
u32 code;
|
||||
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Received Response/Failure");
|
||||
|
||||
if (payloadlen < 4) {
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
|
||||
eap_eke_state(data, FAILURE);
|
||||
return;
|
||||
}
|
||||
|
||||
code = WPA_GET_BE32(payload);
|
||||
wpa_printf(MSG_DEBUG, "EAP-EKE: Peer reported failure code 0x%x", code);
|
||||
|
||||
eap_eke_state(data, FAILURE);
|
||||
}
|
||||
|
||||
|
||||
static void eap_eke_process(struct eap_sm *sm, void *priv,
|
||||
struct wpabuf *respData)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
u8 eke_exch;
|
||||
size_t len;
|
||||
const u8 *pos, *end;
|
||||
|
||||
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, respData, &len);
|
||||
if (pos == NULL || len < 1)
|
||||
return;
|
||||
|
||||
eke_exch = *pos;
|
||||
end = pos + len;
|
||||
pos++;
|
||||
|
||||
wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received payload", pos, end - pos);
|
||||
|
||||
switch (eke_exch) {
|
||||
case EAP_EKE_ID:
|
||||
eap_eke_process_identity(sm, data, respData, pos, end - pos);
|
||||
break;
|
||||
case EAP_EKE_COMMIT:
|
||||
eap_eke_process_commit(sm, data, respData, pos, end - pos);
|
||||
break;
|
||||
case EAP_EKE_CONFIRM:
|
||||
eap_eke_process_confirm(sm, data, respData, pos, end - pos);
|
||||
break;
|
||||
case EAP_EKE_FAILURE:
|
||||
eap_eke_process_failure(sm, data, respData, pos, end - pos);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static Boolean eap_eke_isDone(struct eap_sm *sm, void *priv)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
return data->state == SUCCESS || data->state == FAILURE;
|
||||
}
|
||||
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
|
||||
static Boolean eap_eke_isSuccess(struct eap_sm *sm, void *priv)
|
||||
{
|
||||
struct eap_eke_data *data = priv;
|
||||
return data->state == SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
int eap_server_eke_register(void)
|
||||
{
|
||||
struct eap_method *eap;
|
||||
int ret;
|
||||
|
||||
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
|
||||
EAP_VENDOR_IETF, EAP_TYPE_EKE, "EKE");
|
||||
if (eap == NULL)
|
||||
return -1;
|
||||
|
||||
eap->init = eap_eke_init;
|
||||
eap->reset = eap_eke_reset;
|
||||
eap->buildReq = eap_eke_buildReq;
|
||||
eap->check = eap_eke_check;
|
||||
eap->process = eap_eke_process;
|
||||
eap->isDone = eap_eke_isDone;
|
||||
eap->getKey = eap_eke_getKey;
|
||||
eap->isSuccess = eap_eke_isSuccess;
|
||||
eap->get_emsk = eap_eke_get_emsk;
|
||||
|
||||
ret = eap_server_method_register(eap);
|
||||
if (ret)
|
||||
eap_server_method_free(eap);
|
||||
return ret;
|
||||
}
|
||||
Loading…
Reference in a new issue