+++ /dev/null
-/*
- * EAP-IKEv2 server (RFC 5106)
- * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "eap_i.h"
-#include "eap_common/eap_ikev2_common.h"
-#include "ikev2.h"
-
-
-struct eap_ikev2_data {
- struct ikev2_initiator_data ikev2;
- enum { MSG, FRAG_ACK, WAIT_FRAG_ACK, DONE, FAIL } state;
- struct wpabuf *in_buf;
- struct wpabuf *out_buf;
- size_t out_used;
- size_t fragment_size;
- int keys_ready;
- u8 keymat[EAP_MSK_LEN + EAP_EMSK_LEN];
- int keymat_ok;
-};
-
-
-static const u8 * eap_ikev2_get_shared_secret(void *ctx, const u8 *IDr,
- size_t IDr_len,
- size_t *secret_len)
-{
- struct eap_sm *sm = ctx;
-
- if (IDr == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: No IDr received - default "
- "to user identity from EAP-Identity");
- IDr = sm->identity;
- IDr_len = sm->identity_len;
- }
-
- if (eap_user_get(sm, IDr, IDr_len, 0) < 0 || sm->user == NULL ||
- sm->user->password == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: No user entry found");
- return NULL;
- }
-
- *secret_len = sm->user->password_len;
- return sm->user->password;
-}
-
-
-static const char * eap_ikev2_state_txt(int state)
-{
- switch (state) {
- case MSG:
- return "MSG";
- case FRAG_ACK:
- return "FRAG_ACK";
- case WAIT_FRAG_ACK:
- return "WAIT_FRAG_ACK";
- case DONE:
- return "DONE";
- case FAIL:
- return "FAIL";
- default:
- return "?";
- }
-}
-
-
-static void eap_ikev2_state(struct eap_ikev2_data *data, int state)
-{
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: %s -> %s",
- eap_ikev2_state_txt(data->state),
- eap_ikev2_state_txt(state));
- data->state = state;
-}
-
-
-static void * eap_ikev2_init(struct eap_sm *sm)
-{
- struct eap_ikev2_data *data;
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
- data->state = MSG;
- data->fragment_size = sm->fragment_size > 0 ? sm->fragment_size :
- IKEV2_FRAGMENT_SIZE;
- data->ikev2.state = SA_INIT;
- data->ikev2.peer_auth = PEER_AUTH_SECRET;
- data->ikev2.key_pad = (u8 *) os_strdup("Key Pad for EAP-IKEv2");
- if (data->ikev2.key_pad == NULL)
- goto failed;
- data->ikev2.key_pad_len = 21;
-
- /* TODO: make proposals configurable */
- data->ikev2.proposal.proposal_num = 1;
- data->ikev2.proposal.integ = AUTH_HMAC_SHA1_96;
- data->ikev2.proposal.prf = PRF_HMAC_SHA1;
- data->ikev2.proposal.encr = ENCR_AES_CBC;
- data->ikev2.proposal.dh = DH_GROUP2_1024BIT_MODP;
-
- data->ikev2.IDi = (u8 *) os_strdup("hostapd");
- data->ikev2.IDi_len = 7;
-
- data->ikev2.get_shared_secret = eap_ikev2_get_shared_secret;
- data->ikev2.cb_ctx = sm;
-
- return data;
-
-failed:
- ikev2_initiator_deinit(&data->ikev2);
- os_free(data);
- return NULL;
-}
-
-
-static void eap_ikev2_reset(struct eap_sm *sm, void *priv)
-{
- struct eap_ikev2_data *data = priv;
- wpabuf_free(data->in_buf);
- wpabuf_free(data->out_buf);
- ikev2_initiator_deinit(&data->ikev2);
- os_free(data);
-}
-
-
-static struct wpabuf * eap_ikev2_build_msg(struct eap_ikev2_data *data, u8 id)
-{
- struct wpabuf *req;
- u8 flags;
- size_t send_len, plen, icv_len = 0;
-
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Generating Request");
-
- flags = 0;
- send_len = wpabuf_len(data->out_buf) - data->out_used;
- if (1 + send_len > data->fragment_size) {
- send_len = data->fragment_size - 1;
- flags |= IKEV2_FLAGS_MORE_FRAGMENTS;
- if (data->out_used == 0) {
- flags |= IKEV2_FLAGS_LENGTH_INCLUDED;
- send_len -= 4;
- }
- }
-
- plen = 1 + send_len;
- if (flags & IKEV2_FLAGS_LENGTH_INCLUDED)
- plen += 4;
- if (data->keys_ready) {
- const struct ikev2_integ_alg *integ;
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Add Integrity Checksum "
- "Data");
- flags |= IKEV2_FLAGS_ICV_INCLUDED;
- integ = ikev2_get_integ(data->ikev2.proposal.integ);
- if (integ == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unknown INTEG "
- "transform / cannot generate ICV");
- return NULL;
- }
- icv_len = integ->hash_len;
-
- plen += icv_len;
- }
- req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, plen,
- EAP_CODE_REQUEST, id);
- if (req == NULL)
- return NULL;
-
- wpabuf_put_u8(req, flags); /* Flags */
- if (flags & IKEV2_FLAGS_LENGTH_INCLUDED)
- wpabuf_put_be32(req, wpabuf_len(data->out_buf));
-
- wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
- send_len);
- data->out_used += send_len;
-
- if (flags & IKEV2_FLAGS_ICV_INCLUDED) {
- const u8 *msg = wpabuf_head(req);
- size_t len = wpabuf_len(req);
- ikev2_integ_hash(data->ikev2.proposal.integ,
- data->ikev2.keys.SK_ai,
- data->ikev2.keys.SK_integ_len,
- msg, len, wpabuf_put(req, icv_len));
- }
-
- if (data->out_used == wpabuf_len(data->out_buf)) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Sending out %lu bytes "
- "(message sent completely)",
- (unsigned long) send_len);
- wpabuf_free(data->out_buf);
- data->out_buf = NULL;
- data->out_used = 0;
- } else {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Sending out %lu bytes "
- "(%lu more to send)", (unsigned long) send_len,
- (unsigned long) wpabuf_len(data->out_buf) -
- data->out_used);
- eap_ikev2_state(data, WAIT_FRAG_ACK);
- }
-
- return req;
-}
-
-
-static struct wpabuf * eap_ikev2_buildReq(struct eap_sm *sm, void *priv, u8 id)
-{
- struct eap_ikev2_data *data = priv;
-
- switch (data->state) {
- case MSG:
- if (data->out_buf == NULL) {
- data->out_buf = ikev2_initiator_build(&data->ikev2);
- if (data->out_buf == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Failed to "
- "generate IKEv2 message");
- return NULL;
- }
- data->out_used = 0;
- }
- /* pass through */
- case WAIT_FRAG_ACK:
- return eap_ikev2_build_msg(data, id);
- case FRAG_ACK:
- return eap_ikev2_build_frag_ack(id, EAP_CODE_REQUEST);
- default:
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unexpected state %d in "
- "buildReq", data->state);
- return NULL;
- }
-}
-
-
-static Boolean eap_ikev2_check(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, respData,
- &len);
- if (pos == NULL) {
- wpa_printf(MSG_INFO, "EAP-IKEV2: Invalid frame");
- return TRUE;
- }
-
- return FALSE;
-}
-
-
-static int eap_ikev2_process_icv(struct eap_ikev2_data *data,
- const struct wpabuf *respData,
- u8 flags, const u8 *pos, const u8 **end)
-{
- if (flags & IKEV2_FLAGS_ICV_INCLUDED) {
- int icv_len = eap_ikev2_validate_icv(
- data->ikev2.proposal.integ, &data->ikev2.keys, 0,
- respData, pos, *end);
- if (icv_len < 0)
- return -1;
- /* Hide Integrity Checksum Data from further processing */
- *end -= icv_len;
- } else if (data->keys_ready) {
- wpa_printf(MSG_INFO, "EAP-IKEV2: The message should have "
- "included integrity checksum");
- return -1;
- }
-
- return 0;
-}
-
-
-static int eap_ikev2_process_cont(struct eap_ikev2_data *data,
- const u8 *buf, size_t len)
-{
- /* Process continuation of a pending message */
- if (len > wpabuf_tailroom(data->in_buf)) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Fragment overflow");
- eap_ikev2_state(data, FAIL);
- return -1;
- }
-
- wpabuf_put_data(data->in_buf, buf, len);
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received %lu bytes, waiting for %lu "
- "bytes more", (unsigned long) len,
- (unsigned long) wpabuf_tailroom(data->in_buf));
-
- return 0;
-}
-
-
-static int eap_ikev2_process_fragment(struct eap_ikev2_data *data,
- u8 flags, u32 message_length,
- const u8 *buf, size_t len)
-{
- /* Process a fragment that is not the last one of the message */
- if (data->in_buf == NULL && !(flags & IKEV2_FLAGS_LENGTH_INCLUDED)) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: No Message Length field in "
- "a fragmented packet");
- return -1;
- }
-
- if (data->in_buf == NULL) {
- /* First fragment of the message */
- data->in_buf = wpabuf_alloc(message_length);
- if (data->in_buf == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: No memory for "
- "message");
- return -1;
- }
- wpabuf_put_data(data->in_buf, buf, len);
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received %lu bytes in first "
- "fragment, waiting for %lu bytes more",
- (unsigned long) len,
- (unsigned long) wpabuf_tailroom(data->in_buf));
- }
-
- return 0;
-}
-
-
-static int eap_ikev2_server_keymat(struct eap_ikev2_data *data)
-{
- if (eap_ikev2_derive_keymat(
- data->ikev2.proposal.prf, &data->ikev2.keys,
- data->ikev2.i_nonce, data->ikev2.i_nonce_len,
- data->ikev2.r_nonce, data->ikev2.r_nonce_len,
- data->keymat) < 0) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Failed to derive "
- "key material");
- return -1;
- }
- data->keymat_ok = 1;
- return 0;
-}
-
-
-static void eap_ikev2_process(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_ikev2_data *data = priv;
- const u8 *start, *pos, *end;
- size_t len;
- u8 flags;
- u32 message_length = 0;
- struct wpabuf tmpbuf;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, respData,
- &len);
- if (pos == NULL)
- return; /* Should not happen; message already verified */
-
- start = pos;
- end = start + len;
-
- if (len == 0) {
- /* fragment ack */
- flags = 0;
- } else
- flags = *pos++;
-
- if (eap_ikev2_process_icv(data, respData, flags, pos, &end) < 0) {
- eap_ikev2_state(data, FAIL);
- return;
- }
-
- if (flags & IKEV2_FLAGS_LENGTH_INCLUDED) {
- if (end - pos < 4) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Message underflow");
- eap_ikev2_state(data, FAIL);
- return;
- }
- message_length = WPA_GET_BE32(pos);
- pos += 4;
-
- if (message_length < (u32) (end - pos)) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Invalid Message "
- "Length (%d; %ld remaining in this msg)",
- message_length, (long) (end - pos));
- eap_ikev2_state(data, FAIL);
- return;
- }
- }
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received packet: Flags 0x%x "
- "Message Length %u", flags, message_length);
-
- if (data->state == WAIT_FRAG_ACK) {
- if (len != 0) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unexpected payload "
- "in WAIT_FRAG_ACK state");
- eap_ikev2_state(data, FAIL);
- return;
- }
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Fragment acknowledged");
- eap_ikev2_state(data, MSG);
- return;
- }
-
- if (data->in_buf && eap_ikev2_process_cont(data, pos, end - pos) < 0) {
- eap_ikev2_state(data, FAIL);
- return;
- }
-
- if (flags & IKEV2_FLAGS_MORE_FRAGMENTS) {
- if (eap_ikev2_process_fragment(data, flags, message_length,
- pos, end - pos) < 0)
- eap_ikev2_state(data, FAIL);
- else
- eap_ikev2_state(data, FRAG_ACK);
- return;
- } else if (data->state == FRAG_ACK) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
- data->state = MSG;
- }
-
- if (data->in_buf == NULL) {
- /* Wrap unfragmented messages as wpabuf without extra copy */
- wpabuf_set(&tmpbuf, pos, end - pos);
- data->in_buf = &tmpbuf;
- }
-
- if (ikev2_initiator_process(&data->ikev2, data->in_buf) < 0) {
- if (data->in_buf == &tmpbuf)
- data->in_buf = NULL;
- eap_ikev2_state(data, FAIL);
- return;
- }
-
- switch (data->ikev2.state) {
- case SA_AUTH:
- /* SA_INIT was sent out, so message have to be
- * integrity protected from now on. */
- data->keys_ready = 1;
- break;
- case IKEV2_DONE:
- if (data->state == FAIL)
- break;
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Authentication completed "
- "successfully");
- if (eap_ikev2_server_keymat(data))
- break;
- eap_ikev2_state(data, DONE);
- break;
- default:
- break;
- }
-
- if (data->in_buf != &tmpbuf)
- wpabuf_free(data->in_buf);
- data->in_buf = NULL;
-}
-
-
-static Boolean eap_ikev2_isDone(struct eap_sm *sm, void *priv)
-{
- struct eap_ikev2_data *data = priv;
- return data->state == DONE || data->state == FAIL;
-}
-
-
-static Boolean eap_ikev2_isSuccess(struct eap_sm *sm, void *priv)
-{
- struct eap_ikev2_data *data = priv;
- return data->state == DONE && data->ikev2.state == IKEV2_DONE &&
- data->keymat_ok;
-}
-
-
-static u8 * eap_ikev2_getKey(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_ikev2_data *data = priv;
- u8 *key;
-
- if (data->state != DONE || !data->keymat_ok)
- return NULL;
-
- key = os_malloc(EAP_MSK_LEN);
- if (key) {
- os_memcpy(key, data->keymat, EAP_MSK_LEN);
- *len = EAP_MSK_LEN;
- }
-
- return key;
-}
-
-
-static u8 * eap_ikev2_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_ikev2_data *data = priv;
- u8 *key;
-
- if (data->state != DONE || !data->keymat_ok)
- return NULL;
-
- key = os_malloc(EAP_EMSK_LEN);
- if (key) {
- os_memcpy(key, data->keymat + EAP_MSK_LEN, EAP_EMSK_LEN);
- *len = EAP_EMSK_LEN;
- }
-
- return key;
-}
-
-
-int eap_server_ikev2_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_IKEV2,
- "IKEV2");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_ikev2_init;
- eap->reset = eap_ikev2_reset;
- eap->buildReq = eap_ikev2_buildReq;
- eap->check = eap_ikev2_check;
- eap->process = eap_ikev2_process;
- eap->isDone = eap_ikev2_isDone;
- eap->getKey = eap_ikev2_getKey;
- eap->isSuccess = eap_ikev2_isSuccess;
- eap->get_emsk = eap_ikev2_get_emsk;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
- return ret;
-}
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