+++ /dev/null
-/*
- * EAP-IKEv2 peer (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_responder_data ikev2;
- enum { WAIT_START, PROC_MSG, 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 char * eap_ikev2_state_txt(int state)
-{
- switch (state) {
- case WAIT_START:
- return "WAIT_START";
- case PROC_MSG:
- return "PROC_MSG";
- 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;
- const u8 *identity, *password;
- size_t identity_len, password_len;
-
- identity = eap_get_config_identity(sm, &identity_len);
- if (identity == NULL) {
- wpa_printf(MSG_INFO, "EAP-IKEV2: No identity available");
- return NULL;
- }
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
- data->state = WAIT_START;
- data->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;
- data->ikev2.IDr = os_malloc(identity_len);
- if (data->ikev2.IDr == NULL)
- goto failed;
- os_memcpy(data->ikev2.IDr, identity, identity_len);
- data->ikev2.IDr_len = identity_len;
-
- password = eap_get_config_password(sm, &password_len);
- if (password) {
- data->ikev2.shared_secret = os_malloc(password_len);
- if (data->ikev2.shared_secret == NULL)
- goto failed;
- os_memcpy(data->ikev2.shared_secret, password, password_len);
- data->ikev2.shared_secret_len = password_len;
- }
-
- return data;
-
-failed:
- ikev2_responder_deinit(&data->ikev2);
- os_free(data);
- return NULL;
-}
-
-
-static void eap_ikev2_deinit(struct eap_sm *sm, void *priv)
-{
- struct eap_ikev2_data *data = priv;
- wpabuf_free(data->in_buf);
- wpabuf_free(data->out_buf);
- ikev2_responder_deinit(&data->ikev2);
- os_free(data);
-}
-
-
-static int eap_ikev2_peer_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 struct wpabuf * eap_ikev2_build_msg(struct eap_ikev2_data *data,
- struct eap_method_ret *ret, u8 id)
-{
- struct wpabuf *resp;
- u8 flags;
- size_t send_len, plen, icv_len = 0;
-
- ret->ignore = FALSE;
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Generating Response");
- ret->allowNotifications = TRUE;
-
- 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;
- }
- }
-#ifdef CCNS_PL
- /* Some issues figuring out the length of the message if Message Length
- * field not included?! */
- if (!(flags & IKEV2_FLAGS_LENGTH_INCLUDED))
- flags |= IKEV2_FLAGS_LENGTH_INCLUDED;
-#endif /* CCNS_PL */
-
- 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;
- }
- resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, plen,
- EAP_CODE_RESPONSE, id);
- if (resp == NULL)
- return NULL;
-
- wpabuf_put_u8(resp, flags); /* Flags */
- if (flags & IKEV2_FLAGS_LENGTH_INCLUDED)
- wpabuf_put_be32(resp, wpabuf_len(data->out_buf));
-
- wpabuf_put_data(resp, 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(resp);
- size_t len = wpabuf_len(resp);
- ikev2_integ_hash(data->ikev2.proposal.integ,
- data->ikev2.keys.SK_ar,
- data->ikev2.keys.SK_integ_len,
- msg, len, wpabuf_put(resp, icv_len));
- }
-
- ret->methodState = METHOD_MAY_CONT;
- ret->decision = DECISION_FAIL;
-
- 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;
- 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:
- ret->methodState = METHOD_DONE;
- if (data->state == FAIL)
- break;
- ret->decision = DECISION_COND_SUCC;
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Authentication "
- "completed successfully");
- if (eap_ikev2_peer_keymat(data))
- break;
- eap_ikev2_state(data, DONE);
- break;
- case IKEV2_FAILED:
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Authentication "
- "failed");
- ret->methodState = METHOD_DONE;
- ret->decision = DECISION_FAIL;
- break;
- default:
- break;
- }
- } 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 resp;
-}
-
-
-static int eap_ikev2_process_icv(struct eap_ikev2_data *data,
- const struct wpabuf *reqData,
- 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, 1,
- reqData, 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 struct wpabuf * eap_ikev2_process_fragment(struct eap_ikev2_data *data,
- struct eap_method_ret *ret,
- u8 id, 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");
- ret->ignore = TRUE;
- return NULL;
- }
-
- 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");
- ret->ignore = TRUE;
- return NULL;
- }
- 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 eap_ikev2_build_frag_ack(id, EAP_CODE_RESPONSE);
-}
-
-
-static struct wpabuf * eap_ikev2_process(struct eap_sm *sm, void *priv,
- struct eap_method_ret *ret,
- const struct wpabuf *reqData)
-{
- struct eap_ikev2_data *data = priv;
- const u8 *start, *pos, *end;
- size_t len;
- u8 flags, id;
- u32 message_length = 0;
- struct wpabuf tmpbuf;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IKEV2, reqData, &len);
- if (pos == NULL) {
- ret->ignore = TRUE;
- return NULL;
- }
-
- id = eap_get_id(reqData);
-
- start = pos;
- end = start + len;
-
- if (len == 0)
- flags = 0; /* fragment ack */
- else
- flags = *pos++;
-
- if (eap_ikev2_process_icv(data, reqData, flags, pos, &end) < 0) {
- ret->ignore = TRUE;
- return NULL;
- }
-
- if (flags & IKEV2_FLAGS_LENGTH_INCLUDED) {
- if (end - pos < 4) {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Message underflow");
- ret->ignore = TRUE;
- return NULL;
- }
- 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));
- ret->ignore = TRUE;
- return NULL;
- }
- }
-
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Received packet: Flags 0x%x "
- "Message Length %u", flags, message_length);
-
- if (data->state == WAIT_FRAG_ACK) {
-#ifdef CCNS_PL
- if (len > 1) /* Empty Flags field included in ACK */
-#else /* CCNS_PL */
- if (len != 0)
-#endif /* CCNS_PL */
- {
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Unexpected payload "
- "in WAIT_FRAG_ACK state");
- ret->ignore = TRUE;
- return NULL;
- }
- wpa_printf(MSG_DEBUG, "EAP-IKEV2: Fragment acknowledged");
- eap_ikev2_state(data, PROC_MSG);
- return eap_ikev2_build_msg(data, ret, id);
- }
-
- if (data->in_buf && eap_ikev2_process_cont(data, pos, end - pos) < 0) {
- ret->ignore = TRUE;
- return NULL;
- }
-
- if (flags & IKEV2_FLAGS_MORE_FRAGMENTS) {
- return eap_ikev2_process_fragment(data, ret, id, flags,
- message_length, pos,
- end - pos);
- }
-
- 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_responder_process(&data->ikev2, data->in_buf) < 0) {
- if (data->in_buf == &tmpbuf)
- data->in_buf = NULL;
- eap_ikev2_state(data, FAIL);
- return NULL;
- }
-
- if (data->in_buf != &tmpbuf)
- wpabuf_free(data->in_buf);
- data->in_buf = NULL;
-
- if (data->out_buf == NULL) {
- data->out_buf = ikev2_responder_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;
- }
-
- eap_ikev2_state(data, PROC_MSG);
- return eap_ikev2_build_msg(data, ret, id);
-}
-
-
-static Boolean eap_ikev2_isKeyAvailable(struct eap_sm *sm, void *priv)
-{
- struct eap_ikev2_data *data = priv;
- return data->state == 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_peer_ikev2_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_IKEV2,
- "IKEV2");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_ikev2_init;
- eap->deinit = eap_ikev2_deinit;
- eap->process = eap_ikev2_process;
- eap->isKeyAvailable = eap_ikev2_isKeyAvailable;
- eap->getKey = eap_ikev2_getKey;
- eap->get_emsk = eap_ikev2_get_emsk;
-
- ret = eap_peer_method_register(eap);
- if (ret)
- eap_peer_method_free(eap);
- return ret;
-}
projects / mech_eap.git / blobdiff