mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
271 lines
7.2 KiB
C
271 lines
7.2 KiB
C
/*
|
|
* EAP-FAST common helper functions (RFC 4851)
|
|
* Copyright (c) 2008, 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/sha1.h"
|
|
#include "tls/tls.h"
|
|
#include "eap_peer/eap_defs.h"
|
|
#include "eap_peer/eap_tlv_common.h"
|
|
#include "eap_peer/eap_fast_common.h"
|
|
|
|
|
|
void eap_fast_put_tlv_hdr(struct wpabuf *buf, u16 type, u16 len)
|
|
{
|
|
struct pac_tlv_hdr hdr;
|
|
hdr.type = host_to_be16(type);
|
|
hdr.len = host_to_be16(len);
|
|
wpabuf_put_data(buf, &hdr, sizeof(hdr));
|
|
}
|
|
|
|
|
|
void eap_fast_put_tlv(struct wpabuf *buf, u16 type, const void *data,
|
|
u16 len)
|
|
{
|
|
eap_fast_put_tlv_hdr(buf, type, len);
|
|
wpabuf_put_data(buf, data, len);
|
|
}
|
|
|
|
|
|
void eap_fast_put_tlv_buf(struct wpabuf *buf, u16 type,
|
|
const struct wpabuf *data)
|
|
{
|
|
eap_fast_put_tlv_hdr(buf, type, wpabuf_len(data));
|
|
wpabuf_put_buf(buf, data);
|
|
}
|
|
|
|
|
|
struct wpabuf * eap_fast_tlv_eap_payload(struct wpabuf *buf)
|
|
{
|
|
struct wpabuf *e;
|
|
|
|
if (buf == NULL)
|
|
return NULL;
|
|
|
|
/* Encapsulate EAP packet in EAP-Payload TLV */
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add EAP-Payload TLV");
|
|
e = wpabuf_alloc(sizeof(struct pac_tlv_hdr) + wpabuf_len(buf));
|
|
if (e == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
|
|
"for TLV encapsulation");
|
|
wpabuf_free(buf);
|
|
return NULL;
|
|
}
|
|
eap_fast_put_tlv_buf(e,
|
|
EAP_TLV_TYPE_MANDATORY | EAP_TLV_EAP_PAYLOAD_TLV,
|
|
buf);
|
|
wpabuf_free(buf);
|
|
return e;
|
|
}
|
|
|
|
|
|
void eap_fast_derive_master_secret(const u8 *pac_key, const u8 *server_random,
|
|
const u8 *client_random, u8 *master_secret)
|
|
{
|
|
#define TLS_RANDOM_LEN 32
|
|
#define TLS_MASTER_SECRET_LEN 48
|
|
u8 seed[2 * TLS_RANDOM_LEN];
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: client_random",
|
|
client_random, TLS_RANDOM_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: server_random",
|
|
server_random, TLS_RANDOM_LEN);
|
|
|
|
/*
|
|
* RFC 4851, Section 5.1:
|
|
* master_secret = T-PRF(PAC-Key, "PAC to master secret label hash",
|
|
* server_random + client_random, 48)
|
|
*/
|
|
os_memcpy(seed, server_random, TLS_RANDOM_LEN);
|
|
os_memcpy(seed + TLS_RANDOM_LEN, client_random, TLS_RANDOM_LEN);
|
|
sha1_t_prf(pac_key, EAP_FAST_PAC_KEY_LEN,
|
|
"PAC to master secret label hash",
|
|
seed, sizeof(seed), master_secret, TLS_MASTER_SECRET_LEN);
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: master_secret",
|
|
master_secret, TLS_MASTER_SECRET_LEN);
|
|
}
|
|
|
|
|
|
u8 * eap_fast_derive_key(void *ssl_ctx, struct tls_connection *conn, size_t len)
|
|
{
|
|
u8 *out;
|
|
|
|
out = os_malloc(len);
|
|
if (out == NULL)
|
|
return NULL;
|
|
|
|
if (tls_connection_get_eap_fast_key(ssl_ctx, conn, out, len)) {
|
|
os_free(out);
|
|
return NULL;
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
|
|
int eap_fast_derive_eap_msk(const u8 *simck, u8 *msk)
|
|
{
|
|
/*
|
|
* RFC 4851, Section 5.4: EAP Master Session Key Generation
|
|
* MSK = T-PRF(S-IMCK[j], "Session Key Generating Function", 64)
|
|
*/
|
|
|
|
if (sha1_t_prf(simck, EAP_FAST_SIMCK_LEN,
|
|
"Session Key Generating Function", (u8 *) "", 0,
|
|
msk, EAP_FAST_KEY_LEN) < 0)
|
|
return -1;
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (MSK)",
|
|
msk, EAP_FAST_KEY_LEN);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int eap_fast_derive_eap_emsk(const u8 *simck, u8 *emsk)
|
|
{
|
|
/*
|
|
* RFC 4851, Section 5.4: EAP Master Session Key Genreration
|
|
* EMSK = T-PRF(S-IMCK[j],
|
|
* "Extended Session Key Generating Function", 64)
|
|
*/
|
|
|
|
if (sha1_t_prf(simck, EAP_FAST_SIMCK_LEN,
|
|
"Extended Session Key Generating Function", (u8 *) "", 0,
|
|
emsk, EAP_EMSK_LEN) < 0)
|
|
return -1;
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (EMSK)",
|
|
emsk, EAP_EMSK_LEN);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int eap_fast_parse_tlv(struct eap_fast_tlv_parse *tlv,
|
|
int tlv_type, u8 *pos, size_t len)
|
|
{
|
|
switch (tlv_type) {
|
|
case EAP_TLV_EAP_PAYLOAD_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: EAP-Payload TLV",
|
|
pos, len);
|
|
if (tlv->eap_payload_tlv) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"EAP-Payload TLV in the message");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
tlv->eap_payload_tlv = pos;
|
|
tlv->eap_payload_tlv_len = len;
|
|
break;
|
|
case EAP_TLV_RESULT_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Result TLV", pos, len);
|
|
if (tlv->result) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"Result TLV in the message");
|
|
tlv->result = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
if (len < 2) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
|
|
"Result TLV");
|
|
tlv->result = EAP_TLV_RESULT_FAILURE;
|
|
break;
|
|
}
|
|
tlv->result = WPA_GET_BE16(pos);
|
|
if (tlv->result != EAP_TLV_RESULT_SUCCESS &&
|
|
tlv->result != EAP_TLV_RESULT_FAILURE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Result %d",
|
|
tlv->result);
|
|
tlv->result = EAP_TLV_RESULT_FAILURE;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Result: %s",
|
|
tlv->result == EAP_TLV_RESULT_SUCCESS ?
|
|
"Success" : "Failure");
|
|
break;
|
|
case EAP_TLV_INTERMEDIATE_RESULT_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Intermediate Result TLV",
|
|
pos, len);
|
|
if (len < 2) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
|
|
"Intermediate-Result TLV");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
break;
|
|
}
|
|
if (tlv->iresult) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"Intermediate-Result TLV in the message");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
tlv->iresult = WPA_GET_BE16(pos);
|
|
if (tlv->iresult != EAP_TLV_RESULT_SUCCESS &&
|
|
tlv->iresult != EAP_TLV_RESULT_FAILURE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Unknown Intermediate "
|
|
"Result %d", tlv->iresult);
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Intermediate Result: %s",
|
|
tlv->iresult == EAP_TLV_RESULT_SUCCESS ?
|
|
"Success" : "Failure");
|
|
break;
|
|
case EAP_TLV_CRYPTO_BINDING_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV",
|
|
pos, len);
|
|
if (tlv->crypto_binding) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"Crypto-Binding TLV in the message");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
tlv->crypto_binding_len = sizeof(struct eap_tlv_hdr) + len;
|
|
if (tlv->crypto_binding_len < sizeof(*tlv->crypto_binding)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
|
|
"Crypto-Binding TLV");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
tlv->crypto_binding = (struct eap_tlv_crypto_binding_tlv *)
|
|
(pos - sizeof(struct eap_tlv_hdr));
|
|
break;
|
|
case EAP_TLV_REQUEST_ACTION_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Request-Action TLV",
|
|
pos, len);
|
|
if (tlv->request_action) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"Request-Action TLV in the message");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
if (len < 2) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Too short "
|
|
"Request-Action TLV");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
break;
|
|
}
|
|
tlv->request_action = WPA_GET_BE16(pos);
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Request-Action: %d",
|
|
tlv->request_action);
|
|
break;
|
|
case EAP_TLV_PAC_TLV:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: PAC TLV", pos, len);
|
|
if (tlv->pac) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: More than one "
|
|
"PAC TLV in the message");
|
|
tlv->iresult = EAP_TLV_RESULT_FAILURE;
|
|
return -2;
|
|
}
|
|
tlv->pac = pos;
|
|
tlv->pac_len = len;
|
|
break;
|
|
default:
|
|
/* Unknown TLV */
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|