static u8 * eap_pax_build_std_3(struct eap_sm *sm,
struct eap_pax_data *data,
int id, size_t *reqDataLen)
{
struct eap_pax_hdr *req;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)");
*reqDataLen = sizeof(*req) + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN;
req = VM_MALLOC(*reqDataLen);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
"request");
data->state = FAILURE;
return NULL;
}
req->code = EAP_CODE_REQUEST;
req->identifier = id;
req->length = htons(*reqDataLen);
req->type = EAP_TYPE_PAX;
req->op_code = EAP_PAX_OP_STD_3;
req->flags = 0;
req->mac_id = data->mac_id;
req->dh_group_id = EAP_PAX_DH_GROUP_NONE;
req->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
pos = (u8 *) (req + 1);
*pos++ = 0;
*pos++ = EAP_PAX_MAC_LEN;
eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
data->rand.r.y, EAP_PAX_RAND_LEN,
(u8 *) data->cid, data->cid_len, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)",
pos, EAP_PAX_MAC_LEN);
pos += EAP_PAX_MAC_LEN;
/* Optional ADE could be added here, if needed */
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
(u8 *) req, *reqDataLen - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
pos += EAP_PAX_ICV_LEN;
return (u8 *) req;
}
static struct wpabuf * eap_pax_build_std_3(struct eap_sm *sm,
struct eap_pax_data *data, u8 id)
{
struct wpabuf *req;
struct eap_pax_hdr *pax;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)");
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX,
sizeof(*pax) + 2 + EAP_PAX_MAC_LEN +
EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
"request");
data->state = FAILURE;
return NULL;
}
pax = wpabuf_put(req, sizeof(*pax));
pax->op_code = EAP_PAX_OP_STD_3;
pax->flags = 0;
pax->mac_id = data->mac_id;
pax->dh_group_id = EAP_PAX_DH_GROUP_NONE;
pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
wpabuf_put_be16(req, EAP_PAX_MAC_LEN);
pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
data->rand.r.y, EAP_PAX_RAND_LEN,
(u8 *) data->cid, data->cid_len, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)",
pos, EAP_PAX_MAC_LEN);
pos += EAP_PAX_MAC_LEN;
/* Optional ADE could be added here, if needed */
pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
return req;
}
static u8 * eap_pax_build_std_1(struct eap_sm *sm,
struct eap_pax_data *data,
int id, size_t *reqDataLen)
{
struct eap_pax_hdr *req;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)");
if (hostapd_get_rand(data->rand.r.x, EAP_PAX_RAND_LEN)) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data");
data->state = FAILURE;
return NULL;
}
*reqDataLen = sizeof(*req) + 2 + EAP_PAX_RAND_LEN + EAP_PAX_ICV_LEN;
req = VM_MALLOC(*reqDataLen);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
"request");
data->state = FAILURE;
return NULL;
}
req->code = EAP_CODE_REQUEST;
req->identifier = id;
req->length = htons(*reqDataLen);
req->type = EAP_TYPE_PAX;
req->op_code = EAP_PAX_OP_STD_1;
req->flags = 0;
req->mac_id = data->mac_id;
req->dh_group_id = EAP_PAX_DH_GROUP_NONE;
req->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
pos = (u8 *) (req + 1);
*pos++ = 0;
*pos++ = EAP_PAX_RAND_LEN;
memcpy(pos, data->rand.r.x, EAP_PAX_RAND_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)",
pos, EAP_PAX_RAND_LEN);
pos += EAP_PAX_RAND_LEN;
eap_pax_mac(data->mac_id, (u8 *) "", 0,
(u8 *) req, *reqDataLen - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
pos += EAP_PAX_ICV_LEN;
return (u8 *) req;
}
static struct wpabuf * eap_pax_build_std_1(struct eap_sm *sm,
struct eap_pax_data *data, u8 id)
{
struct wpabuf *req;
struct eap_pax_hdr *pax;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)");
if (random_get_bytes(data->rand.r.x, EAP_PAX_RAND_LEN)) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data");
data->state = FAILURE;
return NULL;
}
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX,
sizeof(*pax) + 2 + EAP_PAX_RAND_LEN +
EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
"request");
data->state = FAILURE;
return NULL;
}
pax = wpabuf_put(req, sizeof(*pax));
pax->op_code = EAP_PAX_OP_STD_1;
pax->flags = 0;
pax->mac_id = data->mac_id;
pax->dh_group_id = EAP_PAX_DH_GROUP_NONE;
pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
wpabuf_put_be16(req, EAP_PAX_RAND_LEN);
wpabuf_put_data(req, data->rand.r.x, EAP_PAX_RAND_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)",
data->rand.r.x, EAP_PAX_RAND_LEN);
pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
eap_pax_mac(data->mac_id, (u8 *) "", 0,
wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, pos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
return req;
}
static void eap_pax_process_std_2(struct eap_sm *sm,
struct eap_pax_data *data,
struct wpabuf *respData)
{
struct eap_pax_hdr *resp;
u8 mac[EAP_PAX_MAC_LEN], icvbuf[EAP_PAX_ICV_LEN];
const u8 *pos;
size_t len, left;
int i;
if (data->state != PAX_STD_1)
return;
wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX_STD-2");
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len);
if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN)
return;
resp = (struct eap_pax_hdr *) pos;
pos = (u8 *) (resp + 1);
left = len - sizeof(*resp);
if (left < 2 + EAP_PAX_RAND_LEN ||
WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (B)");
return;
}
pos += 2;
left -= 2;
os_memcpy(data->rand.r.y, pos, EAP_PAX_RAND_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)",
data->rand.r.y, EAP_PAX_RAND_LEN);
pos += EAP_PAX_RAND_LEN;
left -= EAP_PAX_RAND_LEN;
if (left < 2 || (size_t) 2 + WPA_GET_BE16(pos) > left) {
wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (CID)");
return;
}
data->cid_len = WPA_GET_BE16(pos);
os_free(data->cid);
data->cid = os_malloc(data->cid_len);
if (data->cid == NULL) {
wpa_printf(MSG_INFO, "EAP-PAX: Failed to allocate memory for "
"CID");
return;
}
os_memcpy(data->cid, pos + 2, data->cid_len);
pos += 2 + data->cid_len;
left -= 2 + data->cid_len;
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID",
(u8 *) data->cid, data->cid_len);
if (left < 2 + EAP_PAX_MAC_LEN ||
WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (MAC_CK)");
return;
}
pos += 2;
left -= 2;
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)",
pos, EAP_PAX_MAC_LEN);
if (eap_user_get(sm, (u8 *) data->cid, data->cid_len, 0) < 0) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: unknown CID",
(u8 *) data->cid, data->cid_len);
data->state = FAILURE;
return;
}
for (i = 0;
i < EAP_MAX_METHODS &&
(sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
sm->user->methods[i].method != EAP_TYPE_NONE);
i++) {
if (sm->user->methods[i].vendor == EAP_VENDOR_IETF &&
sm->user->methods[i].method == EAP_TYPE_PAX)
break;
}
if (i >= EAP_MAX_METHODS ||
sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
sm->user->methods[i].method != EAP_TYPE_PAX) {
wpa_hexdump_ascii(MSG_DEBUG,
"EAP-PAX: EAP-PAX not enabled for CID",
(u8 *) data->cid, data->cid_len);
data->state = FAILURE;
return;
}
if (sm->user->password == NULL ||
sm->user->password_len != EAP_PAX_AK_LEN) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: invalid password in "
"user database for CID",
(u8 *) data->cid, data->cid_len);
data->state = FAILURE;
return;
}
os_memcpy(data->ak, sm->user->password, EAP_PAX_AK_LEN);
if (eap_pax_initial_key_derivation(data->mac_id, data->ak,
data->rand.e, data->mk, data->ck,
data->ick) < 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Failed to complete initial "
"key derivation");
data->state = FAILURE;
return;
}
data->keys_set = 1;
eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
data->rand.r.x, EAP_PAX_RAND_LEN,
data->rand.r.y, EAP_PAX_RAND_LEN,
(u8 *) data->cid, data->cid_len, mac);
if (os_memcmp_const(mac, pos, EAP_PAX_MAC_LEN) != 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(A, B, CID) in "
"PAX_STD-2");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected MAC_CK(A, B, CID)",
mac, EAP_PAX_MAC_LEN);
data->state = FAILURE;
return;
}
pos += EAP_PAX_MAC_LEN;
left -= EAP_PAX_MAC_LEN;
if (left < EAP_PAX_ICV_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: Too short ICV (%lu) in "
"PAX_STD-2", (unsigned long) left);
return;
}
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_head(respData),
wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0,
icvbuf);
if (os_memcmp_const(icvbuf, pos, EAP_PAX_ICV_LEN) != 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV in PAX_STD-2");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV",
icvbuf, EAP_PAX_ICV_LEN);
return;
}
pos += EAP_PAX_ICV_LEN;
left -= EAP_PAX_ICV_LEN;
if (left > 0) {
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload",
pos, left);
}
data->state = PAX_STD_3;
}
static Boolean eap_pax_check(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_pax_data *data = priv;
struct eap_pax_hdr *resp;
const u8 *pos;
size_t len, mlen;
u8 icvbuf[EAP_PAX_ICV_LEN], *icv;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len);
if (pos == NULL || len < sizeof(*resp)) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame");
return TRUE;
}
mlen = sizeof(struct eap_hdr) + 1 + len;
resp = (struct eap_pax_hdr *) pos;
wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x "
"flags 0x%x mac_id 0x%x dh_group_id 0x%x "
"public_key_id 0x%x",
resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id,
resp->public_key_id);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload",
(u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN);
if (data->state == PAX_STD_1 &&
resp->op_code != EAP_PAX_OP_STD_2) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - "
"ignore op %d", resp->op_code);
return TRUE;
}
if (data->state == PAX_STD_3 &&
resp->op_code != EAP_PAX_OP_ACK) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - "
"ignore op %d", resp->op_code);
return TRUE;
}
if (resp->op_code != EAP_PAX_OP_STD_2 &&
resp->op_code != EAP_PAX_OP_ACK) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x",
resp->op_code);
}
if (data->mac_id != resp->mac_id) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, "
"received 0x%x", data->mac_id, resp->mac_id);
return TRUE;
}
if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, "
"received 0x%x", EAP_PAX_DH_GROUP_NONE,
resp->dh_group_id);
return TRUE;
}
if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, "
"received 0x%x", EAP_PAX_PUBLIC_KEY_NONE,
resp->public_key_id);
return TRUE;
}
if (resp->flags & EAP_PAX_FLAGS_MF) {
/* TODO: add support for reassembling fragments */
wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported");
return TRUE;
}
if (resp->flags & EAP_PAX_FLAGS_CE) {
wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag");
return TRUE;
}
if (data->keys_set) {
if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet");
return TRUE;
}
icv = wpabuf_mhead_u8(respData) + mlen - EAP_PAX_ICV_LEN;
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN);
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_mhead(respData),
wpabuf_len(respData) - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, icvbuf);
if (os_memcmp_const(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV",
icvbuf, EAP_PAX_ICV_LEN);
return TRUE;
}
}
return FALSE;
}
static struct wpabuf * eap_pax_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct eap_pax_data *data = priv;
const struct eap_pax_hdr *req;
struct wpabuf *resp;
u8 icvbuf[EAP_PAX_ICV_LEN], id;
const u8 *icv, *pos;
size_t len;
u16 flen, mlen;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, reqData, &len);
if (pos == NULL || len < sizeof(*req) + EAP_PAX_ICV_LEN) {
ret->ignore = TRUE;
return NULL;
}
id = eap_get_id(reqData);
req = (const struct eap_pax_hdr *) pos;
flen = len - EAP_PAX_ICV_LEN;
mlen = wpabuf_len(reqData) - EAP_PAX_ICV_LEN;
wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x "
"flags 0x%x mac_id 0x%x dh_group_id 0x%x "
"public_key_id 0x%x",
req->op_code, req->flags, req->mac_id, req->dh_group_id,
req->public_key_id);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload",
pos, len - EAP_PAX_ICV_LEN);
if (data->state != PAX_INIT && data->mac_id != req->mac_id) {
wpa_printf(MSG_INFO, "EAP-PAX: MAC ID changed during "
"authentication (was 0x%d, is 0x%d)",
data->mac_id, req->mac_id);
ret->ignore = TRUE;
return NULL;
}
if (data->state != PAX_INIT && data->dh_group_id != req->dh_group_id) {
wpa_printf(MSG_INFO, "EAP-PAX: DH Group ID changed during "
"authentication (was 0x%d, is 0x%d)",
data->dh_group_id, req->dh_group_id);
ret->ignore = TRUE;
return NULL;
}
if (data->state != PAX_INIT &&
data->public_key_id != req->public_key_id) {
wpa_printf(MSG_INFO, "EAP-PAX: Public Key ID changed during "
"authentication (was 0x%d, is 0x%d)",
data->public_key_id, req->public_key_id);
ret->ignore = TRUE;
return NULL;
}
/* TODO: add support EAP_PAX_HMAC_SHA256_128 */
if (req->mac_id != EAP_PAX_MAC_HMAC_SHA1_128) {
wpa_printf(MSG_INFO, "EAP-PAX: Unsupported MAC ID 0x%x",
req->mac_id);
ret->ignore = TRUE;
return NULL;
}
if (req->dh_group_id != EAP_PAX_DH_GROUP_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Unsupported DH Group ID 0x%x",
req->dh_group_id);
ret->ignore = TRUE;
return NULL;
}
if (req->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Unsupported Public Key ID 0x%x",
req->public_key_id);
ret->ignore = TRUE;
return NULL;
}
if (req->flags & EAP_PAX_FLAGS_MF) {
/* TODO: add support for reassembling fragments */
wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported - "
"ignored packet");
ret->ignore = TRUE;
return NULL;
}
icv = pos + len - EAP_PAX_ICV_LEN;
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN);
if (req->op_code == EAP_PAX_OP_STD_1) {
eap_pax_mac(req->mac_id, (u8 *) "", 0,
wpabuf_head(reqData), mlen, NULL, 0, NULL, 0,
icvbuf);
} else {
eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_head(reqData), mlen, NULL, 0, NULL, 0,
icvbuf);
}
if (os_memcmp_const(icv, icvbuf, EAP_PAX_ICV_LEN) != 0) {
wpa_printf(MSG_DEBUG, "EAP-PAX: invalid ICV - ignoring the "
"message");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected ICV",
icvbuf, EAP_PAX_ICV_LEN);
ret->ignore = TRUE;
return NULL;
}
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
ret->allowNotifications = TRUE;
switch (req->op_code) {
case EAP_PAX_OP_STD_1:
resp = eap_pax_process_std_1(data, ret, id, req, flen);
break;
case EAP_PAX_OP_STD_3:
resp = eap_pax_process_std_3(data, ret, id, req, flen);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PAX: ignoring message with unknown "
"op_code %d", req->op_code);
ret->ignore = TRUE;
return NULL;
}
if (ret->methodState == METHOD_DONE) {
ret->allowNotifications = FALSE;
}
return resp;
}
static struct wpabuf * eap_pax_process_std_3(struct eap_pax_data *data,
struct eap_method_ret *ret, u8 id,
const struct eap_pax_hdr *req,
size_t req_plen)
{
struct wpabuf *resp;
u8 *rpos, mac[EAP_PAX_MAC_LEN];
const u8 *pos;
size_t left;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (received)");
if (data->state != PAX_STD_2_SENT) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 received in "
"unexpected state (%d) - ignored", data->state);
ret->ignore = TRUE;
return NULL;
}
if (req->flags & EAP_PAX_FLAGS_CE) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with CE flag set - "
"ignored");
ret->ignore = TRUE;
return NULL;
}
left = req_plen - sizeof(*req);
if (left < 2 + EAP_PAX_MAC_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with too short "
"payload");
ret->ignore = TRUE;
return NULL;
}
pos = (const u8 *) (req + 1);
if (WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with incorrect "
"MAC_CK length %d (expected %d)",
WPA_GET_BE16(pos), EAP_PAX_MAC_LEN);
ret->ignore = TRUE;
return NULL;
}
pos += 2;
left -= 2;
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)",
pos, EAP_PAX_MAC_LEN);
eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
data->rand.r.y, EAP_PAX_RAND_LEN,
(u8 *) data->cid, data->cid_len, NULL, 0, mac);
if (os_memcmp_const(pos, mac, EAP_PAX_MAC_LEN) != 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(B, CID) "
"received");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected MAC_CK(B, CID)",
mac, EAP_PAX_MAC_LEN);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return NULL;
}
pos += EAP_PAX_MAC_LEN;
left -= EAP_PAX_MAC_LEN;
if (left > 0) {
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload",
pos, left);
}
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX-ACK (sending)");
resp = eap_pax_alloc_resp(req, id, EAP_PAX_OP_ACK, EAP_PAX_ICV_LEN);
if (resp == NULL)
return NULL;
/* Optional ADE could be added here, if needed */
rpos = wpabuf_put(resp, EAP_PAX_ICV_LEN);
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_head(resp), wpabuf_len(resp) - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN);
data->state = PAX_DONE;
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
ret->allowNotifications = FALSE;
return resp;
}
static struct wpabuf * eap_pax_process_std_1(struct eap_pax_data *data,
struct eap_method_ret *ret, u8 id,
const struct eap_pax_hdr *req,
size_t req_plen)
{
struct wpabuf *resp;
const u8 *pos;
u8 *rpos;
size_t left, plen;
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (received)");
if (data->state != PAX_INIT) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 received in "
"unexpected state (%d) - ignored", data->state);
ret->ignore = TRUE;
return NULL;
}
if (req->flags & EAP_PAX_FLAGS_CE) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with CE flag set - "
"ignored");
ret->ignore = TRUE;
return NULL;
}
left = req_plen - sizeof(*req);
if (left < 2 + EAP_PAX_RAND_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with too short "
"payload");
ret->ignore = TRUE;
return NULL;
}
pos = (const u8 *) (req + 1);
if (WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with incorrect A "
"length %d (expected %d)",
WPA_GET_BE16(pos), EAP_PAX_RAND_LEN);
ret->ignore = TRUE;
return NULL;
}
pos += 2;
left -= 2;
os_memcpy(data->rand.r.x, pos, EAP_PAX_RAND_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: X (server rand)",
data->rand.r.x, EAP_PAX_RAND_LEN);
pos += EAP_PAX_RAND_LEN;
left -= EAP_PAX_RAND_LEN;
if (left > 0) {
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload",
pos, left);
}
if (random_get_bytes(data->rand.r.y, EAP_PAX_RAND_LEN)) {
wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data");
ret->ignore = TRUE;
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)",
data->rand.r.y, EAP_PAX_RAND_LEN);
if (eap_pax_initial_key_derivation(req->mac_id, data->ak, data->rand.e,
data->mk, data->ck, data->ick,
data->mid) < 0) {
ret->ignore = TRUE;
return NULL;
}
wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-2 (sending)");
plen = 2 + EAP_PAX_RAND_LEN + 2 + data->cid_len + 2 + EAP_PAX_MAC_LEN +
EAP_PAX_ICV_LEN;
resp = eap_pax_alloc_resp(req, id, EAP_PAX_OP_STD_2, plen);
if (resp == NULL)
return NULL;
wpabuf_put_be16(resp, EAP_PAX_RAND_LEN);
wpabuf_put_data(resp, data->rand.r.y, EAP_PAX_RAND_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: B = Y (client rand)",
data->rand.r.y, EAP_PAX_RAND_LEN);
wpabuf_put_be16(resp, data->cid_len);
wpabuf_put_data(resp, data->cid, data->cid_len);
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID",
(u8 *) data->cid, data->cid_len);
wpabuf_put_be16(resp, EAP_PAX_MAC_LEN);
rpos = wpabuf_put(resp, EAP_PAX_MAC_LEN);
eap_pax_mac(req->mac_id, data->ck, EAP_PAX_CK_LEN,
data->rand.r.x, EAP_PAX_RAND_LEN,
data->rand.r.y, EAP_PAX_RAND_LEN,
(u8 *) data->cid, data->cid_len, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)",
rpos, EAP_PAX_MAC_LEN);
/* Optional ADE could be added here, if needed */
rpos = wpabuf_put(resp, EAP_PAX_ICV_LEN);
eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN,
wpabuf_head(resp), wpabuf_len(resp) - EAP_PAX_ICV_LEN,
NULL, 0, NULL, 0, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN);
data->state = PAX_STD_2_SENT;
data->mac_id = req->mac_id;
data->dh_group_id = req->dh_group_id;
data->public_key_id = req->public_key_id;
return resp;
}
static Boolean eap_pax_check(struct eap_sm *sm, void *priv,
u8 *respData, size_t respDataLen)
{
struct eap_pax_data *data = priv;
struct eap_pax_hdr *resp;
size_t len;
u8 icvbuf[EAP_PAX_ICV_LEN], *icv;
resp = (struct eap_pax_hdr *) respData;
if (respDataLen < sizeof(*resp) || resp->type != EAP_TYPE_PAX ||
(len = ntohs(resp->length)) > respDataLen ||
len < sizeof(*resp) + EAP_PAX_ICV_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame");
return TRUE;
}
wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x "
"flags 0x%x mac_id 0x%x dh_group_id 0x%x "
"public_key_id 0x%x",
resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id,
resp->public_key_id);
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload",
(u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN);
if (data->state == PAX_STD_1 &&
resp->op_code != EAP_PAX_OP_STD_2) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - "
"ignore op %d", resp->op_code);
return TRUE;
}
if (data->state == PAX_STD_3 &&
resp->op_code != EAP_PAX_OP_ACK) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - "
"ignore op %d", resp->op_code);
return TRUE;
}
if (resp->op_code != EAP_PAX_OP_STD_2 &&
resp->op_code != EAP_PAX_OP_ACK) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x",
resp->op_code);
}
if (data->mac_id != resp->mac_id) {
wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, "
"received 0x%x", data->mac_id, resp->mac_id);
return TRUE;
}
if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, "
"received 0x%x", EAP_PAX_DH_GROUP_NONE,
resp->dh_group_id);
return TRUE;
}
if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) {
wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, "
"received 0x%x", EAP_PAX_PUBLIC_KEY_NONE,
resp->public_key_id);
return TRUE;
}
if (resp->flags & EAP_PAX_FLAGS_MF) {
/* TODO: add support for reassembling fragments */
wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported");
return TRUE;
}
if (resp->flags & EAP_PAX_FLAGS_CE) {
wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag");
return TRUE;
}
if (data->keys_set) {
if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) {
wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet");
return TRUE;
}
icv = respData + len - EAP_PAX_ICV_LEN;
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN);
eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
respData, len - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0,
icvbuf);
if (memcmp(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) {
wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV");
wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV",
icvbuf, EAP_PAX_ICV_LEN);
return TRUE;
}
}
return FALSE;
}