EAP-EKE: Add server implementation

This adds a new password-based EAP method defined in RFC 6124.

Signed-hostap: Jouni Malinen <j@w1.fi>

hostapd/Android.mk

@@ -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

hostapd/Makefile

@@ -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

hostapd/defconfig

@@ -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

hostapd/eap_register.c

@@ -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;
 }

src/eap_server/eap_methods.h

@@ -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 */

src/eap_server/eap_server_eke.c

@@ -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;
+}