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fragattacks/src/eap_peer/eap_ikev2.c
Jouni Malinen 0f3d578efc Remove the GPL notification from files contributed by Jouni Malinen 
Remove the GPL notification text from the files that were
initially contributed by myself.

Signed-hostap: Jouni Malinen <j@w1.fi>
2012-02-11 19:39:36 +02:00

501 lines
12 KiB
C
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/*
* EAP-IKEv2 peer (RFC 5106)
* Copyright (c) 2007, 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 "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;
}
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