mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-26 09:18:24 -05:00
94d9bfd59b
This makes it easier to build both EAP peer and server functionality into the same project with some toolchains.
1615 lines
42 KiB
C
1615 lines
42 KiB
C
/*
|
|
* EAP-FAST server (RFC 4851)
|
|
* Copyright (c) 2004-2008, 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 "crypto/aes_wrap.h"
|
|
#include "crypto/sha1.h"
|
|
#include "crypto/tls.h"
|
|
#include "eap_common/eap_tlv_common.h"
|
|
#include "eap_common/eap_fast_common.h"
|
|
#include "eap_i.h"
|
|
#include "eap_tls_common.h"
|
|
|
|
|
|
static void eap_fast_reset(struct eap_sm *sm, void *priv);
|
|
|
|
|
|
/* Private PAC-Opaque TLV types */
|
|
#define PAC_OPAQUE_TYPE_PAD 0
|
|
#define PAC_OPAQUE_TYPE_KEY 1
|
|
#define PAC_OPAQUE_TYPE_LIFETIME 2
|
|
#define PAC_OPAQUE_TYPE_IDENTITY 3
|
|
|
|
struct eap_fast_data {
|
|
struct eap_ssl_data ssl;
|
|
enum {
|
|
START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
|
|
CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
|
|
} state;
|
|
|
|
int fast_version;
|
|
const struct eap_method *phase2_method;
|
|
void *phase2_priv;
|
|
int force_version;
|
|
int peer_version;
|
|
|
|
u8 crypto_binding_nonce[32];
|
|
int final_result;
|
|
|
|
struct eap_fast_key_block_provisioning *key_block_p;
|
|
|
|
u8 simck[EAP_FAST_SIMCK_LEN];
|
|
u8 cmk[EAP_FAST_CMK_LEN];
|
|
int simck_idx;
|
|
|
|
u8 pac_opaque_encr[16];
|
|
u8 *srv_id;
|
|
size_t srv_id_len;
|
|
char *srv_id_info;
|
|
|
|
int anon_provisioning;
|
|
int send_new_pac; /* server triggered re-keying of Tunnel PAC */
|
|
struct wpabuf *pending_phase2_resp;
|
|
u8 *identity; /* from PAC-Opaque */
|
|
size_t identity_len;
|
|
int eap_seq;
|
|
int tnc_started;
|
|
|
|
int pac_key_lifetime;
|
|
int pac_key_refresh_time;
|
|
};
|
|
|
|
|
|
static int eap_fast_process_phase2_start(struct eap_sm *sm,
|
|
struct eap_fast_data *data);
|
|
|
|
|
|
static const char * eap_fast_state_txt(int state)
|
|
{
|
|
switch (state) {
|
|
case START:
|
|
return "START";
|
|
case PHASE1:
|
|
return "PHASE1";
|
|
case PHASE2_START:
|
|
return "PHASE2_START";
|
|
case PHASE2_ID:
|
|
return "PHASE2_ID";
|
|
case PHASE2_METHOD:
|
|
return "PHASE2_METHOD";
|
|
case CRYPTO_BINDING:
|
|
return "CRYPTO_BINDING";
|
|
case REQUEST_PAC:
|
|
return "REQUEST_PAC";
|
|
case SUCCESS:
|
|
return "SUCCESS";
|
|
case FAILURE:
|
|
return "FAILURE";
|
|
default:
|
|
return "Unknown?!";
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_fast_state(struct eap_fast_data *data, int state)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
|
|
eap_fast_state_txt(data->state),
|
|
eap_fast_state_txt(state));
|
|
data->state = state;
|
|
}
|
|
|
|
|
|
static EapType eap_fast_req_failure(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
/* TODO: send Result TLV(FAILURE) */
|
|
eap_fast_state(data, FAILURE);
|
|
return EAP_TYPE_NONE;
|
|
}
|
|
|
|
|
|
static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
|
|
const u8 *client_random,
|
|
const u8 *server_random,
|
|
u8 *master_secret)
|
|
{
|
|
struct eap_fast_data *data = ctx;
|
|
const u8 *pac_opaque;
|
|
size_t pac_opaque_len;
|
|
u8 *buf, *pos, *end, *pac_key = NULL;
|
|
os_time_t lifetime = 0;
|
|
struct os_time now;
|
|
u8 *identity = NULL;
|
|
size_t identity_len = 0;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
|
|
ticket, len);
|
|
|
|
if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
|
|
"SessionTicket");
|
|
return 0;
|
|
}
|
|
|
|
pac_opaque_len = WPA_GET_BE16(ticket + 2);
|
|
pac_opaque = ticket + 4;
|
|
if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
|
|
pac_opaque_len > len - 4) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
|
|
"(len=%lu left=%lu)",
|
|
(unsigned long) pac_opaque_len,
|
|
(unsigned long) len);
|
|
return 0;
|
|
}
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
|
|
pac_opaque, pac_opaque_len);
|
|
|
|
buf = os_malloc(pac_opaque_len - 8);
|
|
if (buf == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
|
|
"for decrypting PAC-Opaque");
|
|
return 0;
|
|
}
|
|
|
|
if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
|
|
pac_opaque, buf) < 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
|
|
"PAC-Opaque");
|
|
os_free(buf);
|
|
/*
|
|
* This may have been caused by server changing the PAC-Opaque
|
|
* encryption key, so just ignore this PAC-Opaque instead of
|
|
* failing the authentication completely. Provisioning can now
|
|
* be used to provision a new PAC.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
end = buf + pac_opaque_len - 8;
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
|
|
buf, end - buf);
|
|
|
|
pos = buf;
|
|
while (pos + 1 < end) {
|
|
if (pos + 2 + pos[1] > end)
|
|
break;
|
|
|
|
switch (*pos) {
|
|
case PAC_OPAQUE_TYPE_PAD:
|
|
pos = end;
|
|
break;
|
|
case PAC_OPAQUE_TYPE_KEY:
|
|
if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
|
|
"PAC-Key length %d", pos[1]);
|
|
os_free(buf);
|
|
return -1;
|
|
}
|
|
pac_key = pos + 2;
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
|
|
"decrypted PAC-Opaque",
|
|
pac_key, EAP_FAST_PAC_KEY_LEN);
|
|
break;
|
|
case PAC_OPAQUE_TYPE_LIFETIME:
|
|
if (pos[1] != 4) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
|
|
"PAC-Key lifetime length %d",
|
|
pos[1]);
|
|
os_free(buf);
|
|
return -1;
|
|
}
|
|
lifetime = WPA_GET_BE32(pos + 2);
|
|
break;
|
|
case PAC_OPAQUE_TYPE_IDENTITY:
|
|
identity = pos + 2;
|
|
identity_len = pos[1];
|
|
break;
|
|
}
|
|
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
if (pac_key == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
|
|
"PAC-Opaque");
|
|
os_free(buf);
|
|
return -1;
|
|
}
|
|
|
|
if (identity) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
|
|
"PAC-Opaque", identity, identity_len);
|
|
os_free(data->identity);
|
|
data->identity = os_malloc(identity_len);
|
|
if (data->identity) {
|
|
os_memcpy(data->identity, identity, identity_len);
|
|
data->identity_len = identity_len;
|
|
}
|
|
}
|
|
|
|
if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
|
|
"(lifetime=%ld now=%ld)", lifetime, now.sec);
|
|
data->send_new_pac = 2;
|
|
/*
|
|
* Allow PAC to be used to allow a PAC update with some level
|
|
* of server authentication (i.e., do not fall back to full TLS
|
|
* handshake since we cannot be sure that the peer would be
|
|
* able to validate server certificate now). However, reject
|
|
* the authentication since the PAC was not valid anymore. Peer
|
|
* can connect again with the newly provisioned PAC after this.
|
|
*/
|
|
} else if (lifetime - now.sec < data->pac_key_refresh_time) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
|
|
"an update if authentication succeeds");
|
|
data->send_new_pac = 1;
|
|
}
|
|
|
|
eap_fast_derive_master_secret(pac_key, server_random, client_random,
|
|
master_secret);
|
|
|
|
os_free(buf);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void eap_fast_derive_key_auth(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
u8 *sks;
|
|
|
|
/* RFC 4851, Section 5.1:
|
|
* Extra key material after TLS key_block: session_key_seed[40]
|
|
*/
|
|
|
|
sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
|
|
EAP_FAST_SKS_LEN);
|
|
if (sks == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
|
|
"session_key_seed");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* RFC 4851, Section 5.2:
|
|
* S-IMCK[0] = session_key_seed
|
|
*/
|
|
wpa_hexdump_key(MSG_DEBUG,
|
|
"EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
|
|
sks, EAP_FAST_SKS_LEN);
|
|
data->simck_idx = 0;
|
|
os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
|
|
os_free(sks);
|
|
}
|
|
|
|
|
|
static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
os_free(data->key_block_p);
|
|
data->key_block_p = (struct eap_fast_key_block_provisioning *)
|
|
eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
|
|
"key expansion",
|
|
sizeof(*data->key_block_p));
|
|
if (data->key_block_p == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
|
|
return;
|
|
}
|
|
/*
|
|
* RFC 4851, Section 5.2:
|
|
* S-IMCK[0] = session_key_seed
|
|
*/
|
|
wpa_hexdump_key(MSG_DEBUG,
|
|
"EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
|
|
data->key_block_p->session_key_seed,
|
|
sizeof(data->key_block_p->session_key_seed));
|
|
data->simck_idx = 0;
|
|
os_memcpy(data->simck, data->key_block_p->session_key_seed,
|
|
EAP_FAST_SIMCK_LEN);
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
|
|
data->key_block_p->server_challenge,
|
|
sizeof(data->key_block_p->server_challenge));
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
|
|
data->key_block_p->client_challenge,
|
|
sizeof(data->key_block_p->client_challenge));
|
|
}
|
|
|
|
|
|
static int eap_fast_get_phase2_key(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
u8 *isk, size_t isk_len)
|
|
{
|
|
u8 *key;
|
|
size_t key_len;
|
|
|
|
os_memset(isk, 0, isk_len);
|
|
|
|
if (data->phase2_method == NULL || data->phase2_priv == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
|
|
"available");
|
|
return -1;
|
|
}
|
|
|
|
if (data->phase2_method->getKey == NULL)
|
|
return 0;
|
|
|
|
if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
|
|
&key_len)) == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
|
|
"from Phase 2");
|
|
return -1;
|
|
}
|
|
|
|
if (key_len > isk_len)
|
|
key_len = isk_len;
|
|
if (key_len == 32 &&
|
|
data->phase2_method->vendor == EAP_VENDOR_IETF &&
|
|
data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
|
|
/*
|
|
* EAP-FAST uses reverse order for MS-MPPE keys when deriving
|
|
* MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
|
|
* ISK for EAP-FAST cryptobinding.
|
|
*/
|
|
os_memcpy(isk, key + 16, 16);
|
|
os_memcpy(isk + 16, key, 16);
|
|
} else
|
|
os_memcpy(isk, key, key_len);
|
|
os_free(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
|
|
{
|
|
u8 isk[32], imck[60];
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
|
|
data->simck_idx + 1);
|
|
|
|
/*
|
|
* RFC 4851, Section 5.2:
|
|
* IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
|
|
* MSK[j], 60)
|
|
* S-IMCK[j] = first 40 octets of IMCK[j]
|
|
* CMK[j] = last 20 octets of IMCK[j]
|
|
*/
|
|
|
|
if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
|
|
return -1;
|
|
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
|
|
sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
|
|
"Inner Methods Compound Keys",
|
|
isk, sizeof(isk), imck, sizeof(imck));
|
|
data->simck_idx++;
|
|
os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
|
|
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
|
|
data->simck, EAP_FAST_SIMCK_LEN);
|
|
os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
|
|
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
|
|
data->cmk, EAP_FAST_CMK_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void * eap_fast_init(struct eap_sm *sm)
|
|
{
|
|
struct eap_fast_data *data;
|
|
u8 ciphers[5] = {
|
|
TLS_CIPHER_ANON_DH_AES128_SHA,
|
|
TLS_CIPHER_AES128_SHA,
|
|
TLS_CIPHER_RSA_DHE_AES128_SHA,
|
|
TLS_CIPHER_RC4_SHA,
|
|
TLS_CIPHER_NONE
|
|
};
|
|
|
|
data = os_zalloc(sizeof(*data));
|
|
if (data == NULL)
|
|
return NULL;
|
|
data->fast_version = EAP_FAST_VERSION;
|
|
data->force_version = -1;
|
|
if (sm->user && sm->user->force_version >= 0) {
|
|
data->force_version = sm->user->force_version;
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
|
|
data->force_version);
|
|
data->fast_version = data->force_version;
|
|
}
|
|
data->state = START;
|
|
|
|
if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
|
|
if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
|
|
ciphers) < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
|
|
"suites");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
|
|
if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
|
|
eap_fast_session_ticket_cb,
|
|
data) < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
|
|
"callback");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
|
|
if (sm->pac_opaque_encr_key == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
|
|
"configured");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
|
|
sizeof(data->pac_opaque_encr));
|
|
|
|
if (sm->eap_fast_a_id == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
data->srv_id = os_malloc(sm->eap_fast_a_id_len);
|
|
if (data->srv_id == NULL) {
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
|
|
data->srv_id_len = sm->eap_fast_a_id_len;
|
|
|
|
if (sm->eap_fast_a_id_info == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
|
|
if (data->srv_id_info == NULL) {
|
|
eap_fast_reset(sm, data);
|
|
return NULL;
|
|
}
|
|
|
|
/* PAC-Key lifetime in seconds (hard limit) */
|
|
data->pac_key_lifetime = sm->pac_key_lifetime;
|
|
|
|
/*
|
|
* PAC-Key refresh time in seconds (soft limit on remaining hard
|
|
* limit). The server will generate a new PAC-Key when this number of
|
|
* seconds (or fewer) of the lifetime remains.
|
|
*/
|
|
data->pac_key_refresh_time = sm->pac_key_refresh_time;
|
|
|
|
return data;
|
|
}
|
|
|
|
|
|
static void eap_fast_reset(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
if (data == NULL)
|
|
return;
|
|
if (data->phase2_priv && data->phase2_method)
|
|
data->phase2_method->reset(sm, data->phase2_priv);
|
|
eap_server_tls_ssl_deinit(sm, &data->ssl);
|
|
os_free(data->srv_id);
|
|
os_free(data->srv_id_info);
|
|
os_free(data->key_block_p);
|
|
wpabuf_free(data->pending_phase2_resp);
|
|
os_free(data->identity);
|
|
os_free(data);
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
|
|
struct eap_fast_data *data, u8 id)
|
|
{
|
|
struct wpabuf *req;
|
|
|
|
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
|
|
1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
|
|
EAP_CODE_REQUEST, id);
|
|
if (req == NULL) {
|
|
wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
|
|
" request");
|
|
eap_fast_state(data, FAILURE);
|
|
return NULL;
|
|
}
|
|
|
|
wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
|
|
|
|
/* RFC 4851, 4.1.1. Authority ID Data */
|
|
eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
|
|
|
|
eap_fast_state(data, PHASE1);
|
|
|
|
return req;
|
|
}
|
|
|
|
|
|
static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
|
|
{
|
|
char cipher[64];
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
|
|
|
|
if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
|
|
< 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
|
|
"information");
|
|
eap_fast_state(data, FAILURE);
|
|
return -1;
|
|
}
|
|
data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
|
|
|
|
if (data->anon_provisioning) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
|
|
eap_fast_derive_key_provisioning(sm, data);
|
|
} else
|
|
eap_fast_derive_key_auth(sm, data);
|
|
|
|
eap_fast_state(data, PHASE2_START);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
u8 id)
|
|
{
|
|
struct wpabuf *req;
|
|
|
|
if (data->phase2_priv == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
|
|
"initialized");
|
|
return NULL;
|
|
}
|
|
req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
|
|
if (req == NULL)
|
|
return NULL;
|
|
|
|
wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
|
|
return eap_fast_tlv_eap_payload(req);
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_fast_build_crypto_binding(
|
|
struct eap_sm *sm, struct eap_fast_data *data)
|
|
{
|
|
struct wpabuf *buf;
|
|
struct eap_tlv_result_tlv *result;
|
|
struct eap_tlv_crypto_binding_tlv *binding;
|
|
|
|
buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
|
|
if (buf == NULL)
|
|
return NULL;
|
|
|
|
if (data->send_new_pac || data->anon_provisioning ||
|
|
data->phase2_method)
|
|
data->final_result = 0;
|
|
else
|
|
data->final_result = 1;
|
|
|
|
if (!data->final_result || data->eap_seq > 1) {
|
|
/* Intermediate-Result */
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
|
|
"(status=SUCCESS)");
|
|
result = wpabuf_put(buf, sizeof(*result));
|
|
result->tlv_type = host_to_be16(
|
|
EAP_TLV_TYPE_MANDATORY |
|
|
EAP_TLV_INTERMEDIATE_RESULT_TLV);
|
|
result->length = host_to_be16(2);
|
|
result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
|
|
}
|
|
|
|
if (data->final_result) {
|
|
/* Result TLV */
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
|
|
"(status=SUCCESS)");
|
|
result = wpabuf_put(buf, sizeof(*result));
|
|
result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
|
|
EAP_TLV_RESULT_TLV);
|
|
result->length = host_to_be16(2);
|
|
result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
|
|
}
|
|
|
|
/* Crypto-Binding TLV */
|
|
binding = wpabuf_put(buf, sizeof(*binding));
|
|
binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
|
|
EAP_TLV_CRYPTO_BINDING_TLV);
|
|
binding->length = host_to_be16(sizeof(*binding) -
|
|
sizeof(struct eap_tlv_hdr));
|
|
binding->version = EAP_FAST_VERSION;
|
|
binding->received_version = data->peer_version;
|
|
binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
|
|
if (os_get_random(binding->nonce, sizeof(binding->nonce)) < 0) {
|
|
wpabuf_free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* RFC 4851, Section 4.2.8:
|
|
* The nonce in a request MUST have its least significant bit set to 0.
|
|
*/
|
|
binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
|
|
|
|
os_memcpy(data->crypto_binding_nonce, binding->nonce,
|
|
sizeof(binding->nonce));
|
|
|
|
/*
|
|
* RFC 4851, Section 5.3:
|
|
* CMK = CMK[j]
|
|
* Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
|
|
*/
|
|
|
|
hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
|
|
(u8 *) binding, sizeof(*binding),
|
|
binding->compound_mac);
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
|
|
"Received Version %d SubType %d",
|
|
binding->version, binding->received_version,
|
|
binding->subtype);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
|
|
binding->nonce, sizeof(binding->nonce));
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
|
|
binding->compound_mac, sizeof(binding->compound_mac));
|
|
|
|
return buf;
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
u8 pac_key[EAP_FAST_PAC_KEY_LEN];
|
|
u8 *pac_buf, *pac_opaque;
|
|
struct wpabuf *buf;
|
|
u8 *pos;
|
|
size_t buf_len, srv_id_info_len, pac_len;
|
|
struct eap_tlv_hdr *pac_tlv;
|
|
struct pac_tlv_hdr *pac_info;
|
|
struct eap_tlv_result_tlv *result;
|
|
struct os_time now;
|
|
|
|
if (os_get_random(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
|
|
os_get_time(&now) < 0)
|
|
return NULL;
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
|
|
pac_key, EAP_FAST_PAC_KEY_LEN);
|
|
|
|
pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
|
|
(2 + sm->identity_len) + 8;
|
|
pac_buf = os_malloc(pac_len);
|
|
if (pac_buf == NULL)
|
|
return NULL;
|
|
|
|
srv_id_info_len = os_strlen(data->srv_id_info);
|
|
|
|
pos = pac_buf;
|
|
*pos++ = PAC_OPAQUE_TYPE_KEY;
|
|
*pos++ = EAP_FAST_PAC_KEY_LEN;
|
|
os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
|
|
pos += EAP_FAST_PAC_KEY_LEN;
|
|
|
|
*pos++ = PAC_OPAQUE_TYPE_LIFETIME;
|
|
*pos++ = 4;
|
|
WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
|
|
pos += 4;
|
|
|
|
if (sm->identity) {
|
|
*pos++ = PAC_OPAQUE_TYPE_IDENTITY;
|
|
*pos++ = sm->identity_len;
|
|
os_memcpy(pos, sm->identity, sm->identity_len);
|
|
pos += sm->identity_len;
|
|
}
|
|
|
|
pac_len = pos - pac_buf;
|
|
while (pac_len % 8) {
|
|
*pos++ = PAC_OPAQUE_TYPE_PAD;
|
|
pac_len++;
|
|
}
|
|
|
|
pac_opaque = os_malloc(pac_len + 8);
|
|
if (pac_opaque == NULL) {
|
|
os_free(pac_buf);
|
|
return NULL;
|
|
}
|
|
if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
|
|
pac_opaque) < 0) {
|
|
os_free(pac_buf);
|
|
os_free(pac_opaque);
|
|
return NULL;
|
|
}
|
|
os_free(pac_buf);
|
|
|
|
pac_len += 8;
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
|
|
pac_opaque, pac_len);
|
|
|
|
buf_len = sizeof(*pac_tlv) +
|
|
sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
|
|
sizeof(struct pac_tlv_hdr) + pac_len +
|
|
data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
|
|
buf = wpabuf_alloc(buf_len);
|
|
if (buf == NULL) {
|
|
os_free(pac_opaque);
|
|
return NULL;
|
|
}
|
|
|
|
/* Result TLV */
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
|
|
result = wpabuf_put(buf, sizeof(*result));
|
|
WPA_PUT_BE16((u8 *) &result->tlv_type,
|
|
EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
|
|
WPA_PUT_BE16((u8 *) &result->length, 2);
|
|
WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
|
|
|
|
/* PAC TLV */
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
|
|
pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
|
|
pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
|
|
EAP_TLV_PAC_TLV);
|
|
|
|
/* PAC-Key */
|
|
eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
|
|
|
|
/* PAC-Opaque */
|
|
eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
|
|
os_free(pac_opaque);
|
|
|
|
/* PAC-Info */
|
|
pac_info = wpabuf_put(buf, sizeof(*pac_info));
|
|
pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
|
|
|
|
/* PAC-Lifetime (inside PAC-Info) */
|
|
eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
|
|
wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
|
|
|
|
/* A-ID (inside PAC-Info) */
|
|
eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
|
|
|
|
/* Note: headers may be misaligned after A-ID */
|
|
|
|
/* A-ID-Info (inside PAC-Info) */
|
|
eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
|
|
srv_id_info_len);
|
|
|
|
/* PAC-Type (inside PAC-Info) */
|
|
eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
|
|
wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
|
|
|
|
/* Update PAC-Info and PAC TLV Length fields */
|
|
pos = wpabuf_put(buf, 0);
|
|
pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
|
|
pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
|
|
|
|
return buf;
|
|
}
|
|
|
|
|
|
static int eap_fast_encrypt_phase2(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
struct wpabuf *plain, int piggyback)
|
|
{
|
|
struct wpabuf *encr;
|
|
|
|
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
|
|
plain);
|
|
encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
|
|
wpabuf_free(plain);
|
|
|
|
if (data->ssl.tls_out && piggyback) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
|
|
"(len=%d) with last Phase 1 Message (len=%d "
|
|
"used=%d)",
|
|
(int) wpabuf_len(encr),
|
|
(int) wpabuf_len(data->ssl.tls_out),
|
|
(int) data->ssl.tls_out_pos);
|
|
if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
|
|
wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
|
|
"output buffer");
|
|
wpabuf_free(encr);
|
|
return -1;
|
|
}
|
|
wpabuf_put_buf(data->ssl.tls_out, encr);
|
|
wpabuf_free(encr);
|
|
} else {
|
|
wpabuf_free(data->ssl.tls_out);
|
|
data->ssl.tls_out_pos = 0;
|
|
data->ssl.tls_out = encr;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
struct wpabuf *req = NULL;
|
|
int piggyback = 0;
|
|
|
|
if (data->ssl.state == FRAG_ACK) {
|
|
return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
|
|
data->fast_version);
|
|
}
|
|
|
|
if (data->ssl.state == WAIT_FRAG_ACK) {
|
|
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
|
|
data->fast_version, id);
|
|
}
|
|
|
|
switch (data->state) {
|
|
case START:
|
|
return eap_fast_build_start(sm, data, id);
|
|
case PHASE1:
|
|
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
|
|
if (eap_fast_phase1_done(sm, data) < 0)
|
|
return NULL;
|
|
if (data->state == PHASE2_START) {
|
|
/*
|
|
* Try to generate Phase 2 data to piggyback
|
|
* with the end of Phase 1 to avoid extra
|
|
* roundtrip.
|
|
*/
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
|
|
"Phase 2");
|
|
if (eap_fast_process_phase2_start(sm, data))
|
|
break;
|
|
req = eap_fast_build_phase2_req(sm, data, id);
|
|
piggyback = 1;
|
|
}
|
|
}
|
|
break;
|
|
case PHASE2_ID:
|
|
case PHASE2_METHOD:
|
|
req = eap_fast_build_phase2_req(sm, data, id);
|
|
break;
|
|
case CRYPTO_BINDING:
|
|
req = eap_fast_build_crypto_binding(sm, data);
|
|
if (data->phase2_method) {
|
|
/*
|
|
* Include the start of the next EAP method in the
|
|
* sequence in the same message with Crypto-Binding to
|
|
* save a round-trip.
|
|
*/
|
|
struct wpabuf *eap;
|
|
eap = eap_fast_build_phase2_req(sm, data, id);
|
|
req = wpabuf_concat(req, eap);
|
|
eap_fast_state(data, PHASE2_METHOD);
|
|
}
|
|
break;
|
|
case REQUEST_PAC:
|
|
req = eap_fast_build_pac(sm, data);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
return NULL;
|
|
}
|
|
|
|
if (req &&
|
|
eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
|
|
return NULL;
|
|
|
|
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
|
|
data->fast_version, id);
|
|
}
|
|
|
|
|
|
static Boolean eap_fast_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_FAST, respData, &len);
|
|
if (pos == NULL || len < 1) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
|
|
EapType eap_type)
|
|
{
|
|
if (data->phase2_priv && data->phase2_method) {
|
|
data->phase2_method->reset(sm, data->phase2_priv);
|
|
data->phase2_method = NULL;
|
|
data->phase2_priv = NULL;
|
|
}
|
|
data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
|
|
eap_type);
|
|
if (!data->phase2_method)
|
|
return -1;
|
|
|
|
if (data->key_block_p) {
|
|
sm->auth_challenge = data->key_block_p->server_challenge;
|
|
sm->peer_challenge = data->key_block_p->client_challenge;
|
|
}
|
|
sm->init_phase2 = 1;
|
|
data->phase2_priv = data->phase2_method->init(sm);
|
|
sm->init_phase2 = 0;
|
|
sm->auth_challenge = NULL;
|
|
sm->peer_challenge = NULL;
|
|
|
|
return data->phase2_priv == NULL ? -1 : 0;
|
|
}
|
|
|
|
|
|
static void eap_fast_process_phase2_response(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
u8 *in_data, size_t in_len)
|
|
{
|
|
u8 next_type = EAP_TYPE_NONE;
|
|
struct eap_hdr *hdr;
|
|
u8 *pos;
|
|
size_t left;
|
|
struct wpabuf buf;
|
|
const struct eap_method *m = data->phase2_method;
|
|
void *priv = data->phase2_priv;
|
|
|
|
if (priv == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
|
|
"initialized?!", __func__);
|
|
return;
|
|
}
|
|
|
|
hdr = (struct eap_hdr *) in_data;
|
|
pos = (u8 *) (hdr + 1);
|
|
|
|
if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
|
|
left = in_len - sizeof(*hdr);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
|
|
"allowed types", pos + 1, left - 1);
|
|
#ifdef EAP_SERVER_TNC
|
|
if (m && m->vendor == EAP_VENDOR_IETF &&
|
|
m->method == EAP_TYPE_TNC) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
|
|
"TNC negotiation");
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
eap_fast_phase2_init(sm, data, next_type);
|
|
return;
|
|
}
|
|
#endif /* EAP_SERVER_TNC */
|
|
eap_sm_process_nak(sm, pos + 1, left - 1);
|
|
if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
|
|
sm->user->methods[sm->user_eap_method_index].method !=
|
|
EAP_TYPE_NONE) {
|
|
next_type = sm->user->methods[
|
|
sm->user_eap_method_index++].method;
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
|
|
next_type);
|
|
} else {
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
}
|
|
eap_fast_phase2_init(sm, data, next_type);
|
|
return;
|
|
}
|
|
|
|
wpabuf_set(&buf, in_data, in_len);
|
|
|
|
if (m->check(sm, priv, &buf)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
|
|
"ignore the packet");
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
return;
|
|
}
|
|
|
|
m->process(sm, priv, &buf);
|
|
|
|
if (!m->isDone(sm, priv))
|
|
return;
|
|
|
|
if (!m->isSuccess(sm, priv)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
eap_fast_phase2_init(sm, data, next_type);
|
|
return;
|
|
}
|
|
|
|
switch (data->state) {
|
|
case PHASE2_ID:
|
|
if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
|
|
"Identity not found in the user "
|
|
"database",
|
|
sm->identity, sm->identity_len);
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
break;
|
|
}
|
|
|
|
eap_fast_state(data, PHASE2_METHOD);
|
|
if (data->anon_provisioning) {
|
|
/*
|
|
* Only EAP-MSCHAPv2 is allowed for anonymous
|
|
* provisioning.
|
|
*/
|
|
next_type = EAP_TYPE_MSCHAPV2;
|
|
sm->user_eap_method_index = 0;
|
|
} else {
|
|
next_type = sm->user->methods[0].method;
|
|
sm->user_eap_method_index = 1;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
|
|
break;
|
|
case PHASE2_METHOD:
|
|
case CRYPTO_BINDING:
|
|
eap_fast_update_icmk(sm, data);
|
|
eap_fast_state(data, CRYPTO_BINDING);
|
|
data->eap_seq++;
|
|
next_type = EAP_TYPE_NONE;
|
|
#ifdef EAP_SERVER_TNC
|
|
if (sm->tnc && !data->tnc_started) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
|
|
next_type = EAP_TYPE_TNC;
|
|
data->tnc_started = 1;
|
|
}
|
|
#endif /* EAP_SERVER_TNC */
|
|
break;
|
|
case FAILURE:
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
break;
|
|
}
|
|
|
|
eap_fast_phase2_init(sm, data, next_type);
|
|
}
|
|
|
|
|
|
static void eap_fast_process_phase2_eap(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
u8 *in_data, size_t in_len)
|
|
{
|
|
struct eap_hdr *hdr;
|
|
size_t len;
|
|
|
|
hdr = (struct eap_hdr *) in_data;
|
|
if (in_len < (int) sizeof(*hdr)) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
|
|
"EAP frame (len=%lu)", (unsigned long) in_len);
|
|
eap_fast_req_failure(sm, data);
|
|
return;
|
|
}
|
|
len = be_to_host16(hdr->length);
|
|
if (len > in_len) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
|
|
"Phase 2 EAP frame (len=%lu hdr->length=%lu)",
|
|
(unsigned long) in_len, (unsigned long) len);
|
|
eap_fast_req_failure(sm, data);
|
|
return;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
|
|
"identifier=%d length=%lu", hdr->code, hdr->identifier,
|
|
(unsigned long) len);
|
|
switch (hdr->code) {
|
|
case EAP_CODE_RESPONSE:
|
|
eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
|
|
"Phase 2 EAP header", hdr->code);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static int eap_fast_parse_tlvs(struct wpabuf *data,
|
|
struct eap_fast_tlv_parse *tlv)
|
|
{
|
|
int mandatory, tlv_type, len, res;
|
|
u8 *pos, *end;
|
|
|
|
os_memset(tlv, 0, sizeof(*tlv));
|
|
|
|
pos = wpabuf_mhead(data);
|
|
end = pos + wpabuf_len(data);
|
|
while (pos + 4 < end) {
|
|
mandatory = pos[0] & 0x80;
|
|
tlv_type = WPA_GET_BE16(pos) & 0x3fff;
|
|
pos += 2;
|
|
len = WPA_GET_BE16(pos);
|
|
pos += 2;
|
|
if (pos + len > end) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
|
|
return -1;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
|
|
"TLV type %d length %d%s",
|
|
tlv_type, len, mandatory ? " (mandatory)" : "");
|
|
|
|
res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
|
|
if (res == -2)
|
|
break;
|
|
if (res < 0) {
|
|
if (mandatory) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
|
|
"mandatory TLV type %d", tlv_type);
|
|
/* TODO: generate Nak TLV */
|
|
break;
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
|
|
"unknown optional TLV type %d",
|
|
tlv_type);
|
|
}
|
|
}
|
|
|
|
pos += len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_fast_validate_crypto_binding(
|
|
struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
|
|
size_t bind_len)
|
|
{
|
|
u8 cmac[SHA1_MAC_LEN];
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
|
|
"Version %d Received Version %d SubType %d",
|
|
b->version, b->received_version, b->subtype);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
|
|
b->nonce, sizeof(b->nonce));
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
|
|
b->compound_mac, sizeof(b->compound_mac));
|
|
|
|
if (b->version != EAP_FAST_VERSION ||
|
|
b->received_version != EAP_FAST_VERSION) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
|
|
"in Crypto-Binding: version %d "
|
|
"received_version %d", b->version,
|
|
b->received_version);
|
|
return -1;
|
|
}
|
|
|
|
if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
|
|
"Crypto-Binding: %d", b->subtype);
|
|
return -1;
|
|
}
|
|
|
|
if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
|
|
(data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
|
|
"Crypto-Binding");
|
|
return -1;
|
|
}
|
|
|
|
os_memcpy(cmac, b->compound_mac, sizeof(cmac));
|
|
os_memset(b->compound_mac, 0, sizeof(cmac));
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
|
|
"Compound MAC calculation",
|
|
(u8 *) b, bind_len);
|
|
hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
|
|
b->compound_mac);
|
|
if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
|
|
wpa_hexdump(MSG_MSGDUMP,
|
|
"EAP-FAST: Calculated Compound MAC",
|
|
b->compound_mac, sizeof(cmac));
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
|
|
"match");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
|
|
{
|
|
struct eap_tlv_pac_type_tlv *tlv;
|
|
|
|
if (pac == NULL || len != sizeof(*tlv))
|
|
return 0;
|
|
|
|
tlv = (struct eap_tlv_pac_type_tlv *) pac;
|
|
|
|
return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
|
|
be_to_host16(tlv->length) == 2 &&
|
|
be_to_host16(tlv->pac_type) == type;
|
|
}
|
|
|
|
|
|
static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
struct wpabuf *in_data)
|
|
{
|
|
struct eap_fast_tlv_parse tlv;
|
|
int check_crypto_binding = data->state == CRYPTO_BINDING;
|
|
|
|
if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
|
|
"Phase 2 TLVs");
|
|
return;
|
|
}
|
|
|
|
if (tlv.result == EAP_TLV_RESULT_FAILURE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
|
|
"failure");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (data->state == REQUEST_PAC) {
|
|
u16 type, len, res;
|
|
if (tlv.pac == NULL || tlv.pac_len < 6) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
|
|
"Acknowledgement received");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
type = WPA_GET_BE16(tlv.pac);
|
|
len = WPA_GET_BE16(tlv.pac + 2);
|
|
res = WPA_GET_BE16(tlv.pac + 4);
|
|
|
|
if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
|
|
res != EAP_TLV_RESULT_SUCCESS) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
|
|
"contain acknowledgement");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
|
|
"- PAC provisioning succeeded");
|
|
eap_fast_state(data, (data->anon_provisioning ||
|
|
data->send_new_pac == 2) ?
|
|
FAILURE : SUCCESS);
|
|
return;
|
|
}
|
|
|
|
if (check_crypto_binding) {
|
|
if (tlv.crypto_binding == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
|
|
"TLV received");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (data->final_result &&
|
|
tlv.result != EAP_TLV_RESULT_SUCCESS) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
|
|
"without Success Result");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (!data->final_result &&
|
|
tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
|
|
"without intermediate Success Result");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
|
|
tlv.crypto_binding_len)) {
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
|
|
"received");
|
|
if (data->final_result) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
|
|
"completed successfully");
|
|
}
|
|
|
|
if (data->anon_provisioning &&
|
|
sm->eap_fast_prov != ANON_PROV &&
|
|
sm->eap_fast_prov != BOTH_PROV) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
|
|
"use unauthenticated provisioning which is "
|
|
"disabled");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (sm->eap_fast_prov != AUTH_PROV &&
|
|
sm->eap_fast_prov != BOTH_PROV &&
|
|
tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
|
|
eap_fast_pac_type(tlv.pac, tlv.pac_len,
|
|
PAC_TYPE_TUNNEL_PAC)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
|
|
"use authenticated provisioning which is "
|
|
"disabled");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (data->anon_provisioning ||
|
|
(tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
|
|
eap_fast_pac_type(tlv.pac, tlv.pac_len,
|
|
PAC_TYPE_TUNNEL_PAC))) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
|
|
"Tunnel PAC");
|
|
eap_fast_state(data, REQUEST_PAC);
|
|
} else if (data->send_new_pac) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
|
|
"re-keying of Tunnel PAC");
|
|
eap_fast_state(data, REQUEST_PAC);
|
|
} else if (data->final_result)
|
|
eap_fast_state(data, SUCCESS);
|
|
}
|
|
|
|
if (tlv.eap_payload_tlv) {
|
|
eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
|
|
tlv.eap_payload_tlv_len);
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_fast_process_phase2(struct eap_sm *sm,
|
|
struct eap_fast_data *data,
|
|
struct wpabuf *in_buf)
|
|
{
|
|
struct wpabuf *in_decrypted;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
|
|
" Phase 2", (unsigned long) wpabuf_len(in_buf));
|
|
|
|
if (data->pending_phase2_resp) {
|
|
wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
|
|
"skip decryption and use old data");
|
|
eap_fast_process_phase2_tlvs(sm, data,
|
|
data->pending_phase2_resp);
|
|
wpabuf_free(data->pending_phase2_resp);
|
|
data->pending_phase2_resp = NULL;
|
|
return;
|
|
}
|
|
|
|
in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
|
|
in_buf);
|
|
if (in_decrypted == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
|
|
"data");
|
|
eap_fast_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
|
|
in_decrypted);
|
|
|
|
eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
|
|
|
|
if (sm->method_pending == METHOD_PENDING_WAIT) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
|
|
"pending wait state - save decrypted response");
|
|
wpabuf_free(data->pending_phase2_resp);
|
|
data->pending_phase2_resp = in_decrypted;
|
|
return;
|
|
}
|
|
|
|
wpabuf_free(in_decrypted);
|
|
}
|
|
|
|
|
|
static int eap_fast_process_version(struct eap_sm *sm, void *priv,
|
|
int peer_version)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
|
|
data->peer_version = peer_version;
|
|
|
|
if (data->force_version >= 0 && peer_version != data->force_version) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
|
|
" version (forced=%d peer=%d) - reject",
|
|
data->force_version, peer_version);
|
|
return -1;
|
|
}
|
|
|
|
if (peer_version < data->fast_version) {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
|
|
"use version %d",
|
|
peer_version, data->fast_version, peer_version);
|
|
data->fast_version = peer_version;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_fast_process_phase1(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
|
|
eap_fast_state(data, FAILURE);
|
|
return -1;
|
|
}
|
|
|
|
if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
|
|
wpabuf_len(data->ssl.tls_out) > 0)
|
|
return 1;
|
|
|
|
/*
|
|
* Phase 1 was completed with the received message (e.g., when using
|
|
* abbreviated handshake), so Phase 2 can be started immediately
|
|
* without having to send through an empty message to the peer.
|
|
*/
|
|
|
|
return eap_fast_phase1_done(sm, data);
|
|
}
|
|
|
|
|
|
static int eap_fast_process_phase2_start(struct eap_sm *sm,
|
|
struct eap_fast_data *data)
|
|
{
|
|
u8 next_type;
|
|
|
|
if (data->identity) {
|
|
os_free(sm->identity);
|
|
sm->identity = data->identity;
|
|
data->identity = NULL;
|
|
sm->identity_len = data->identity_len;
|
|
data->identity_len = 0;
|
|
sm->require_identity_match = 1;
|
|
if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
|
|
"Phase2 Identity not found "
|
|
"in the user database",
|
|
sm->identity, sm->identity_len);
|
|
next_type = eap_fast_req_failure(sm, data);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
|
|
"known - skip Phase 2 Identity Request");
|
|
next_type = sm->user->methods[0].method;
|
|
sm->user_eap_method_index = 1;
|
|
}
|
|
|
|
eap_fast_state(data, PHASE2_METHOD);
|
|
} else {
|
|
eap_fast_state(data, PHASE2_ID);
|
|
next_type = EAP_TYPE_IDENTITY;
|
|
}
|
|
|
|
return eap_fast_phase2_init(sm, data, next_type);
|
|
}
|
|
|
|
|
|
static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
|
|
const struct wpabuf *respData)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
|
|
switch (data->state) {
|
|
case PHASE1:
|
|
if (eap_fast_process_phase1(sm, data))
|
|
break;
|
|
|
|
/* fall through to PHASE2_START */
|
|
case PHASE2_START:
|
|
eap_fast_process_phase2_start(sm, data);
|
|
break;
|
|
case PHASE2_ID:
|
|
case PHASE2_METHOD:
|
|
case CRYPTO_BINDING:
|
|
case REQUEST_PAC:
|
|
eap_fast_process_phase2(sm, data, data->ssl.tls_in);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
|
|
data->state, __func__);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_fast_process(struct eap_sm *sm, void *priv,
|
|
struct wpabuf *respData)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
if (eap_server_tls_process(sm, &data->ssl, respData, data,
|
|
EAP_TYPE_FAST, eap_fast_process_version,
|
|
eap_fast_process_msg) < 0)
|
|
eap_fast_state(data, FAILURE);
|
|
}
|
|
|
|
|
|
static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
return data->state == SUCCESS || data->state == FAILURE;
|
|
}
|
|
|
|
|
|
static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
u8 *eapKeyData;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
|
|
if (eapKeyData == NULL)
|
|
return NULL;
|
|
|
|
eap_fast_derive_eap_msk(data->simck, eapKeyData);
|
|
*len = EAP_FAST_KEY_LEN;
|
|
|
|
return eapKeyData;
|
|
}
|
|
|
|
|
|
static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
u8 *eapKeyData;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
eapKeyData = os_malloc(EAP_EMSK_LEN);
|
|
if (eapKeyData == NULL)
|
|
return NULL;
|
|
|
|
eap_fast_derive_eap_emsk(data->simck, eapKeyData);
|
|
*len = EAP_EMSK_LEN;
|
|
|
|
return eapKeyData;
|
|
}
|
|
|
|
|
|
static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_fast_data *data = priv;
|
|
return data->state == SUCCESS;
|
|
}
|
|
|
|
|
|
int eap_server_fast_register(void)
|
|
{
|
|
struct eap_method *eap;
|
|
int ret;
|
|
|
|
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
|
|
EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
|
|
if (eap == NULL)
|
|
return -1;
|
|
|
|
eap->init = eap_fast_init;
|
|
eap->reset = eap_fast_reset;
|
|
eap->buildReq = eap_fast_buildReq;
|
|
eap->check = eap_fast_check;
|
|
eap->process = eap_fast_process;
|
|
eap->isDone = eap_fast_isDone;
|
|
eap->getKey = eap_fast_getKey;
|
|
eap->get_emsk = eap_fast_get_emsk;
|
|
eap->isSuccess = eap_fast_isSuccess;
|
|
|
|
ret = eap_server_method_register(eap);
|
|
if (ret)
|
|
eap_server_method_free(eap);
|
|
return ret;
|
|
}
|