/*
* EAP peer method: EAP-FAST (RFC 4851)
* Copyright (c) 2004-2008, 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/tls.h"
#include "crypto/sha1.h"
#include "eap_common/eap_tlv_common.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_config.h"
#include "eap_fast_pac.h"
#ifdef EAP_FAST_DYNAMIC
#include "eap_fast_pac.c"
#endif /* EAP_FAST_DYNAMIC */
/* TODO:
* - test session resumption and enable it if it interoperates
* - password change (pending mschapv2 packet; replay decrypted packet)
*/
static void eap_fast_deinit(struct eap_sm *sm, void *priv);
struct eap_fast_data {
struct eap_ssl_data ssl;
int fast_version;
const struct eap_method *phase2_method;
void *phase2_priv;
int phase2_success;
struct eap_method_type phase2_type;
struct eap_method_type *phase2_types;
size_t num_phase2_types;
int resuming; /* starting a resumed session */
struct eap_fast_key_block_provisioning *key_block_p;
#define EAP_FAST_PROV_UNAUTH 1
#define EAP_FAST_PROV_AUTH 2
int provisioning_allowed; /* Allowed PAC provisioning modes */
int provisioning; /* doing PAC provisioning (not the normal auth) */
int anon_provisioning; /* doing anonymous (unauthenticated)
* provisioning */
int session_ticket_used;
u8 key_data[EAP_FAST_KEY_LEN];
u8 *session_id;
size_t id_len;
u8 emsk[EAP_EMSK_LEN];
int success;
struct eap_fast_pac *pac;
struct eap_fast_pac *current_pac;
size_t max_pac_list_len;
int use_pac_binary_format;
u8 simck[EAP_FAST_SIMCK_LEN];
int simck_idx;
struct wpabuf *pending_phase2_req;
};
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;
wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
if (client_random == NULL || server_random == NULL ||
master_secret == NULL) {
wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
"back to full TLS handshake");
data->session_ticket_used = 0;
if (data->provisioning_allowed) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
"new PAC-Key");
data->provisioning = 1;
data->current_pac = NULL;
}
return 0;
}
wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
if (data->current_pac == NULL) {
wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
"using SessionTicket");
data->session_ticket_used = 0;
return 0;
}
eap_fast_derive_master_secret(data->current_pac->pac_key,
server_random, client_random,
master_secret);
data->session_ticket_used = 1;
return 1;
}
static int eap_fast_parse_phase1(struct eap_fast_data *data,
const char *phase1)
{
const char *pos;
pos = os_strstr(phase1, "fast_provisioning=");
if (pos) {
data->provisioning_allowed = atoi(pos + 18);
wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
"mode: %d", data->provisioning_allowed);
}
pos = os_strstr(phase1, "fast_max_pac_list_len=");
if (pos) {
data->max_pac_list_len = atoi(pos + 22);
if (data->max_pac_list_len == 0)
data->max_pac_list_len = 1;
wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
(unsigned long) data->max_pac_list_len);
}
pos = os_strstr(phase1, "fast_pac_format=binary");
if (pos) {
data->use_pac_binary_format = 1;
wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
"list");
}
return 0;
}
static void * eap_fast_init(struct eap_sm *sm)
{
struct eap_fast_data *data;
struct eap_peer_config *config = eap_get_config(sm);
if (config == NULL)
return NULL;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->fast_version = EAP_FAST_VERSION;
data->max_pac_list_len = 10;
if (config->phase1 && eap_fast_parse_phase1(data, config->phase1) < 0) {
eap_fast_deinit(sm, data);
return NULL;
}
if (eap_peer_select_phase2_methods(config, "auth=",
&data->phase2_types,
&data->num_phase2_types) < 0) {
eap_fast_deinit(sm, data);
return NULL;
}
data->phase2_type.vendor = EAP_VENDOR_IETF;
data->phase2_type.method = EAP_TYPE_NONE;
if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
eap_fast_deinit(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_deinit(sm, data);
return NULL;
}
/*
* The local RADIUS server in a Cisco AP does not seem to like empty
* fragments before data, so disable that workaround for CBC.
* TODO: consider making this configurable
*/
if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
"workarounds");
}
if (!config->pac_file) {
wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
eap_fast_deinit(sm, data);
return NULL;
}
if (data->use_pac_binary_format &&
eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
eap_fast_deinit(sm, data);
return NULL;
}
if (!data->use_pac_binary_format &&
eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
eap_fast_deinit(sm, data);
return NULL;
}
eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
if (data->pac == NULL && !data->provisioning_allowed) {
wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
"provisioning disabled");
eap_fast_deinit(sm, data);
return NULL;
}
return data;
}
static void eap_fast_deinit(struct eap_sm *sm, void *priv)
{
struct eap_fast_data *data = priv;
struct eap_fast_pac *pac, *prev;
if (data == NULL)
return;
if (data->phase2_priv && data->phase2_method)
data->phase2_method->deinit(sm, data->phase2_priv);
os_free(data->phase2_types);
os_free(data->key_block_p);
eap_peer_tls_ssl_deinit(sm, &data->ssl);
pac = data->pac;
prev = NULL;
while (pac) {
prev = pac;
pac = pac->next;
eap_fast_free_pac(prev);
}
os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
os_memset(data->emsk, 0, EAP_EMSK_LEN);
os_free(data->session_id);
wpabuf_free(data->pending_phase2_req);
os_free(data);
}
static int eap_fast_derive_msk(struct eap_fast_data *data)
{
eap_fast_derive_eap_msk(data->simck, data->key_data);
eap_fast_derive_eap_emsk(data->simck, data->emsk);
data->success = 1;
return 0;
}
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 void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
{
if (data->anon_provisioning)
eap_fast_derive_key_provisioning(sm, data);
else
eap_fast_derive_key_auth(sm, data);
}
static int eap_fast_init_phase2_method(struct eap_sm *sm,
struct eap_fast_data *data)
{
data->phase2_method =
eap_peer_get_eap_method(data->phase2_type.vendor,
data->phase2_type.method);
if (data->phase2_method == NULL)
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 int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
{
size_t i;
/* TODO: TNC with anonymous provisioning; need to require both
* completed MSCHAPv2 and TNC */
if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
"during unauthenticated provisioning; reject phase2"
" type %d", type);
return -1;
}
#ifdef EAP_TNC
if (type == EAP_TYPE_TNC) {
data->phase2_type.vendor = EAP_VENDOR_IETF;
data->phase2_type.method = EAP_TYPE_TNC;
wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
"vendor %d method %d for TNC",
data->phase2_type.vendor,
data->phase2_type.method);
return 0;
}
#endif /* EAP_TNC */
for (i = 0; i < data->num_phase2_types; i++) {
if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
data->phase2_types[i].method != type)
continue;
data->phase2_type.vendor = data->phase2_types[i].vendor;
data->phase2_type.method = data->phase2_types[i].method;
wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
"vendor %d method %d",
data->phase2_type.vendor,
data->phase2_type.method);
break;
}
if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
return -1;
return 0;
}
static int eap_fast_phase2_request(struct eap_sm *sm,
struct eap_fast_data *data,
struct eap_method_ret *ret,
struct eap_hdr *hdr,
struct wpabuf **resp)
{
size_t len = be_to_host16(hdr->length);
u8 *pos;
struct eap_method_ret iret;
struct eap_peer_config *config = eap_get_config(sm);
struct wpabuf msg;
if (len <= sizeof(struct eap_hdr)) {
wpa_printf(MSG_INFO, "EAP-FAST: too short "
"Phase 2 request (len=%lu)", (unsigned long) len);
return -1;
}
pos = (u8 *) (hdr + 1);
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
if (*pos == EAP_TYPE_IDENTITY) {
*resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
return 0;
}
if (data->phase2_priv && data->phase2_method &&
*pos != data->phase2_type.method) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
"deinitialize previous method");
data->phase2_method->deinit(sm, data->phase2_priv);
data->phase2_method = NULL;
data->phase2_priv = NULL;
data->phase2_type.vendor = EAP_VENDOR_IETF;
data->phase2_type.method = EAP_TYPE_NONE;
}
if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
data->phase2_type.method == EAP_TYPE_NONE &&
eap_fast_select_phase2_method(data, *pos) < 0) {
if (eap_peer_tls_phase2_nak(data->phase2_types,
data->num_phase2_types,
hdr, resp))
return -1;
return 0;
}
if ((data->phase2_priv == NULL &&
eap_fast_init_phase2_method(sm, data) < 0) ||
data->phase2_method == NULL) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
"Phase 2 EAP method %d", *pos);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return -1;
}
os_memset(&iret, 0, sizeof(iret));
wpabuf_set(&msg, hdr, len);
*resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
&msg);
if (*resp == NULL ||
(iret.methodState == METHOD_DONE &&
iret.decision == DECISION_FAIL)) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
} else if ((iret.methodState == METHOD_DONE ||
iret.methodState == METHOD_MAY_CONT) &&
(iret.decision == DECISION_UNCOND_SUCC ||
iret.decision == DECISION_COND_SUCC)) {
data->phase2_success = 1;
}
if (*resp == NULL && config &&
(config->pending_req_identity || config->pending_req_password ||
config->pending_req_otp || config->pending_req_new_password)) {
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
} else if (*resp == NULL)
return -1;
return 0;
}
static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
{
struct wpabuf *buf;
struct eap_tlv_nak_tlv *nak;
buf = wpabuf_alloc(sizeof(*nak));
if (buf == NULL)
return NULL;
nak = wpabuf_put(buf, sizeof(*nak));
nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
nak->length = host_to_be16(6);
nak->vendor_id = host_to_be32(vendor_id);
nak->nak_type = host_to_be16(tlv_type);
return buf;
}
static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
{
struct wpabuf *buf;
struct eap_tlv_intermediate_result_tlv *result;
buf = wpabuf_alloc(sizeof(*result));
if (buf == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
intermediate ? "Intermediate " : "", status);
result = wpabuf_put(buf, sizeof(*result));
result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
(intermediate ?
EAP_TLV_INTERMEDIATE_RESULT_TLV :
EAP_TLV_RESULT_TLV));
result->length = host_to_be16(2);
result->status = host_to_be16(status);
return buf;
}
static struct wpabuf * eap_fast_tlv_pac_ack(void)
{
struct wpabuf *buf;
struct eap_tlv_result_tlv *res;
struct eap_tlv_pac_ack_tlv *ack;
buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
if (buf == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
ack = wpabuf_put(buf, sizeof(*ack));
ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
EAP_TLV_TYPE_MANDATORY);
ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
ack->pac_len = host_to_be16(2);
ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
return buf;
}
static struct wpabuf * eap_fast_process_eap_payload_tlv(
struct eap_sm *sm, struct eap_fast_data *data,
struct eap_method_ret *ret,
u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
{
struct eap_hdr *hdr;
struct wpabuf *resp = NULL;
if (eap_payload_tlv_len < sizeof(*hdr)) {
wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
"Payload TLV (len=%lu)",
(unsigned long) eap_payload_tlv_len);
return NULL;
}
hdr = (struct eap_hdr *) eap_payload_tlv;
if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
"EAP Payload TLV");
return NULL;
}
if (hdr->code != EAP_CODE_REQUEST) {
wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
"Phase 2 EAP header", hdr->code);
return NULL;
}
if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
"failed");
return NULL;
}
return eap_fast_tlv_eap_payload(resp);
}
static int eap_fast_validate_crypto_binding(
struct eap_tlv_crypto_binding_tlv *_bind)
{
wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
"Received Version %d SubType %d",
_bind->version, _bind->received_version, _bind->subtype);
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
_bind->nonce, sizeof(_bind->nonce));
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
_bind->compound_mac, sizeof(_bind->compound_mac));
if (_bind->version != EAP_FAST_VERSION ||
_bind->received_version != EAP_FAST_VERSION ||
_bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
"Crypto-Binding TLV: Version %d "
"Received Version %d SubType %d",
_bind->version, _bind->received_version,
_bind->subtype);
return -1;
}
return 0;
}
static void eap_fast_write_crypto_binding(
struct eap_tlv_crypto_binding_tlv *rbind,
struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
{
rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
EAP_TLV_CRYPTO_BINDING_TLV);
rbind->length = host_to_be16(sizeof(*rbind) -
sizeof(struct eap_tlv_hdr));
rbind->version = EAP_FAST_VERSION;
rbind->received_version = _bind->version;
rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
rbind->compound_mac);
wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
"Received Version %d SubType %d",
rbind->version, rbind->received_version, rbind->subtype);
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
rbind->nonce, sizeof(rbind->nonce));
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
rbind->compound_mac, sizeof(rbind->compound_mac));
}
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->isKeyAvailable == NULL ||
data->phase2_method->getKey == NULL)
return 0;
if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
(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_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
u8 *cmk)
{
u8 isk[32], imck[60];
wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
"calculation", 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(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
cmk, EAP_FAST_CMK_LEN);
return 0;
}
static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
{
struct eap_tlv_hdr *pac;
struct eap_tlv_request_action_tlv *act;
struct eap_tlv_pac_type_tlv *type;
act = (struct eap_tlv_request_action_tlv *) pos;
act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
act->length = host_to_be16(2);
act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
pac = (struct eap_tlv_hdr *) (act + 1);
pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
pac->length = host_to_be16(sizeof(*type));
type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
type->length = host_to_be16(2);
type->pac_type = host_to_be16(pac_type);
return (u8 *) (type + 1);
}
static struct wpabuf * eap_fast_process_crypto_binding(
struct eap_sm *sm, struct eap_fast_data *data,
struct eap_method_ret *ret,
struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
{
struct wpabuf *resp;
u8 *pos;
u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
int res;
size_t len;
if (eap_fast_validate_crypto_binding(_bind) < 0)
return NULL;
if (eap_fast_get_cmk(sm, data, cmk) < 0)
return NULL;
/* Validate received Compound MAC */
os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
os_memset(_bind->compound_mac, 0, sizeof(cmac));
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
"MAC calculation", (u8 *) _bind, bind_len);
hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
_bind->compound_mac);
res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac));
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
cmac, sizeof(cmac));
wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
_bind->compound_mac, sizeof(cmac));
if (res != 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
return NULL;
}
/*
* Compound MAC was valid, so authentication succeeded. Reply with
* crypto binding to allow server to complete authentication.
*/
len = sizeof(struct eap_tlv_crypto_binding_tlv);
resp = wpabuf_alloc(len);
if (resp == NULL)
return NULL;
if (!data->anon_provisioning && data->phase2_success &&
eap_fast_derive_msk(data) < 0) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
data->phase2_success = 0;
wpabuf_free(resp);
return NULL;
}
if (!data->anon_provisioning && data->phase2_success) {
os_free(data->session_id);
data->session_id = eap_peer_tls_derive_session_id(
sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
if (data->session_id) {
wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
data->session_id, data->id_len);
} else {
wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
"Session-Id");
wpabuf_free(resp);
return NULL;
}
}
pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
pos, _bind, cmk);
return resp;
}
static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
u8 *pos, size_t len, int *pac_key_found)
{
switch (type & 0x7fff) {
case PAC_TYPE_PAC_KEY:
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
if (len != EAP_FAST_PAC_KEY_LEN) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
"length %lu", (unsigned long) len);
break;
}
*pac_key_found = 1;
os_memcpy(entry->pac_key, pos, len);
break;
case PAC_TYPE_PAC_OPAQUE:
wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
entry->pac_opaque = pos;
entry->pac_opaque_len = len;
break;
case PAC_TYPE_PAC_INFO:
wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
entry->pac_info = pos;
entry->pac_info_len = len;
break;
default:
wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
type);
break;
}
}
static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
u8 *pac, size_t pac_len)
{
struct pac_tlv_hdr *hdr;
u8 *pos;
size_t left, len;
int type, pac_key_found = 0;
pos = pac;
left = pac_len;
while (left > sizeof(*hdr)) {
hdr = (struct pac_tlv_hdr *) pos;
type = be_to_host16(hdr->type);
len = be_to_host16(hdr->len);
pos += sizeof(*hdr);
left -= sizeof(*hdr);
if (len > left) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
"(type=%d len=%lu left=%lu)",
type, (unsigned long) len,
(unsigned long) left);
return -1;
}
eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
pos += len;
left -= len;
}
if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
"all the required fields");
return -1;
}
return 0;
}
static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
u8 *pos, size_t len)
{
u16 pac_type;
u32 lifetime;
struct os_time now;
switch (type & 0x7fff) {
case PAC_TYPE_CRED_LIFETIME:
if (len != 4) {
wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
"Invalid CRED_LIFETIME length - ignored",
pos, len);
return 0;
}
/*
* This is not currently saved separately in PAC files since
* the server can automatically initiate PAC update when
* needed. Anyway, the information is available from PAC-Info
* dump if it is needed for something in the future.
*/
lifetime = WPA_GET_BE32(pos);
os_get_time(&now);
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
"(%d days)",
lifetime, (lifetime - (u32) now.sec) / 86400);
break;
case PAC_TYPE_A_ID:
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
pos, len);
entry->a_id = pos;
entry->a_id_len = len;
break;
case PAC_TYPE_I_ID:
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
pos, len);
entry->i_id = pos;
entry->i_id_len = len;
break;
case PAC_TYPE_A_ID_INFO:
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
pos, len);
entry->a_id_info = pos;
entry->a_id_info_len = len;
break;
case PAC_TYPE_PAC_TYPE:
/* RFC 5422, Section 4.2.6 - PAC-Type TLV */
if (len != 2) {
wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
"length %lu (expected 2)",
(unsigned long) len);
wpa_hexdump_ascii(MSG_DEBUG,
"EAP-FAST: PAC-Info - PAC-Type",
pos, len);
return -1;
}
pac_type = WPA_GET_BE16(pos);
if (pac_type != PAC_TYPE_TUNNEL_PAC &&
pac_type != PAC_TYPE_USER_AUTHORIZATION &&
pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
"%d", pac_type);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
pac_type);
entry->pac_type = pac_type;
break;
default:
wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
"type %d", type);
break;
}
return 0;
}
static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
{
struct pac_tlv_hdr *hdr;
u8 *pos;
size_t left, len;
int type;
/* RFC 5422, Section 4.2.4 */
/* PAC-Type defaults to Tunnel PAC (Type 1) */
entry->pac_type = PAC_TYPE_TUNNEL_PAC;
pos = entry->pac_info;
left = entry->pac_info_len;
while (left > sizeof(*hdr)) {
hdr = (struct pac_tlv_hdr *) pos;
type = be_to_host16(hdr->type);
len = be_to_host16(hdr->len);
pos += sizeof(*hdr);
left -= sizeof(*hdr);
if (len > left) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
"(type=%d len=%lu left=%lu)",
type, (unsigned long) len,
(unsigned long) left);
return -1;
}
if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
return -1;
pos += len;
left -= len;
}
if (entry->a_id == NULL || entry->a_id_info == NULL) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
"all the required fields");
return -1;
}
return 0;
}
static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
struct eap_fast_data *data,
struct eap_method_ret *ret,
u8 *pac, size_t pac_len)
{
struct eap_peer_config *config = eap_get_config(sm);
struct eap_fast_pac entry;
os_memset(&entry, 0, sizeof(entry));
if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
eap_fast_process_pac_info(&entry))
return NULL;
eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
if (data->use_pac_binary_format)
eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
else
eap_fast_save_pac(sm, data->pac, config->pac_file);
if (data->provisioning) {
if (data->anon_provisioning) {
/*
* Unauthenticated provisioning does not provide keying
* material and must end with an EAP-Failure.
* Authentication will be done separately after this.
*/
data->success = 0;
ret->decision = DECISION_FAIL;
} else {
/*
* Server may or may not allow authenticated
* provisioning also for key generation.
*/
ret->decision = DECISION_COND_SUCC;
}
wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
"- Provisioning completed successfully");
sm->expected_failure = 1;
} else {
/*
* This is PAC refreshing, i.e., normal authentication that is
* expected to be completed with an EAP-Success. However,
* RFC 5422, Section 3.5 allows EAP-Failure to be sent even
* after protected success exchange in case of EAP-Fast
* provisioning, so we better use DECISION_COND_SUCC here
* instead of DECISION_UNCOND_SUCC.
*/
wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
"- PAC refreshing completed successfully");
ret->decision = DECISION_COND_SUCC;
}
ret->methodState = METHOD_DONE;
return eap_fast_tlv_pac_ack();
}
static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
struct eap_fast_tlv_parse *tlv,
struct wpabuf **resp)
{
int mandatory, tlv_type, res;
size_t len;
u8 *pos, *end;
os_memset(tlv, 0, sizeof(*tlv));
/* Parse TLVs from the decrypted Phase 2 data */
pos = wpabuf_mhead(decrypted);
end = pos + wpabuf_len(decrypted);
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 (len > (size_t) (end - pos)) {
wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
"TLV type %d length %u%s",
tlv_type, (unsigned int) 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);
*resp = eap_fast_tlv_nak(0, tlv_type);
break;
} else {
wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
"unknown optional TLV type %d",
tlv_type);
}
}
pos += len;
}
return 0;
}
static int eap_fast_encrypt_response(struct eap_sm *sm,
struct eap_fast_data *data,
struct wpabuf *resp,
u8 identifier, struct wpabuf **out_data)
{
if (resp == NULL)
return 0;
wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
resp);
if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
data->fast_version, identifier,
resp, out_data)) {
wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
"frame");
}
wpabuf_free(resp);
return 0;
}
static struct wpabuf * eap_fast_pac_request(void)
{
struct wpabuf *tmp;
u8 *pos, *pos2;
tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
sizeof(struct eap_tlv_request_action_tlv) +
sizeof(struct eap_tlv_pac_type_tlv));
if (tmp == NULL)
return NULL;
pos = wpabuf_put(tmp, 0);
pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
wpabuf_put(tmp, pos2 - pos);
return tmp;
}
static int eap_fast_process_decrypted(struct eap_sm *sm,
struct eap_fast_data *data,
struct eap_method_ret *ret,
const struct eap_hdr *req,
struct wpabuf *decrypted,
struct wpabuf **out_data)
{
struct wpabuf *resp = NULL, *tmp;
struct eap_fast_tlv_parse tlv;
int failed = 0;
if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
return 0;
if (resp)
return eap_fast_encrypt_response(sm, data, resp,
req->identifier, out_data);
if (tlv.result == EAP_TLV_RESULT_FAILURE) {
resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
return eap_fast_encrypt_response(sm, data, resp,
req->identifier, out_data);
}
if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
return eap_fast_encrypt_response(sm, data, resp,
req->identifier, out_data);
}
if (tlv.crypto_binding) {
tmp = eap_fast_process_crypto_binding(sm, data, ret,
tlv.crypto_binding,
tlv.crypto_binding_len);
if (tmp == NULL)
failed = 1;
else
resp = wpabuf_concat(resp, tmp);
}
if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
EAP_TLV_RESULT_SUCCESS, 1);
resp = wpabuf_concat(resp, tmp);
}
if (tlv.eap_payload_tlv) {
tmp = eap_fast_process_eap_payload_tlv(
sm, data, ret, tlv.eap_payload_tlv,
tlv.eap_payload_tlv_len);
resp = wpabuf_concat(resp, tmp);
}
if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
"acknowledging success");
failed = 1;
} else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
tlv.pac_len);
resp = wpabuf_concat(resp, tmp);
}
if (data->current_pac == NULL && data->provisioning &&
!data->anon_provisioning && !tlv.pac &&
(tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
tlv.result == EAP_TLV_RESULT_SUCCESS)) {
/*
* Need to request Tunnel PAC when using authenticated
* provisioning.
*/
wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
tmp = eap_fast_pac_request();
resp = wpabuf_concat(resp, tmp);
}
if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
resp = wpabuf_concat(tmp, resp);
} else if (failed) {
tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
resp = wpabuf_concat(tmp, resp);
}
if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
tlv.crypto_binding && data->phase2_success) {
if (data->anon_provisioning) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
"provisioning completed successfully.");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
sm->expected_failure = 1;
} else {
wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
"completed successfully.");
if (data->provisioning)
ret->methodState = METHOD_MAY_CONT;
else
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
}
}
if (resp == NULL) {
wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
"empty response packet");
resp = wpabuf_alloc(1);
}
return eap_fast_encrypt_response(sm, data, resp, req->identifier,
out_data);
}
static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
struct eap_method_ret *ret,
const struct eap_hdr *req,
const struct wpabuf *in_data,
struct wpabuf **out_data)
{
struct wpabuf *in_decrypted;
int res;
wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
" Phase 2", (unsigned long) wpabuf_len(in_data));
if (data->pending_phase2_req) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
"skip decryption and use old data");
/* Clear TLS reassembly state. */
eap_peer_tls_reset_input(&data->ssl);
in_decrypted = data->pending_phase2_req;
data->pending_phase2_req = NULL;
goto continue_req;
}
if (wpabuf_len(in_data) == 0) {
/* Received TLS ACK - requesting more fragments */
return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
data->fast_version,
req->identifier, NULL, out_data);
}
res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
if (res)
return res;
continue_req:
wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
in_decrypted);
if (wpabuf_len(in_decrypted) < 4) {
wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
"TLV frame (len=%lu)",
(unsigned long) wpabuf_len(in_decrypted));
wpabuf_free(in_decrypted);
return -1;
}
res = eap_fast_process_decrypted(sm, data, ret, req,
in_decrypted, out_data);
wpabuf_free(in_decrypted);
return res;
}
static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
{
const u8 *a_id;
struct pac_tlv_hdr *hdr;
/*
* Parse authority identity (A-ID) from the EAP-FAST/Start. This
* supports both raw A-ID and one inside an A-ID TLV.
*/
a_id = buf;
*id_len = len;
if (len > sizeof(*hdr)) {
int tlen;
hdr = (struct pac_tlv_hdr *) buf;
tlen = be_to_host16(hdr->len);
if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
sizeof(*hdr) + tlen <= len) {
wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
"(Start)");
a_id = (u8 *) (hdr + 1);
*id_len = tlen;
}
}
wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
return a_id;
}
static void eap_fast_select_pac(struct eap_fast_data *data,
const u8 *a_id, size_t a_id_len)
{
data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
PAC_TYPE_TUNNEL_PAC);
if (data->current_pac == NULL) {
/*
* Tunnel PAC was not available for this A-ID. Try to use
* Machine Authentication PAC, if one is available.
*/
data->current_pac = eap_fast_get_pac(
data->pac, a_id, a_id_len,
PAC_TYPE_MACHINE_AUTHENTICATION);
}
if (data->current_pac) {
wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
"(PAC-Type %d)", data->current_pac->pac_type);
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
data->current_pac->a_id_info,
data->current_pac->a_id_info_len);
}
}
static int eap_fast_use_pac_opaque(struct eap_sm *sm,
struct eap_fast_data *data,
struct eap_fast_pac *pac)
{
u8 *tlv;
size_t tlv_len, olen;
struct eap_tlv_hdr *ehdr;
olen = pac->pac_opaque_len;
tlv_len = sizeof(*ehdr) + olen;
tlv = os_malloc(tlv_len);
if (tlv) {
ehdr = (struct eap_tlv_hdr *) tlv;
ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
ehdr->length = host_to_be16(olen);
os_memcpy(ehdr + 1, pac->pac_opaque, olen);
}
if (tlv == NULL ||
tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
TLS_EXT_PAC_OPAQUE,
tlv, tlv_len) < 0) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
"extension");
os_free(tlv);
return -1;
}
os_free(tlv);
return 0;
}
static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
struct eap_fast_data *data)
{
if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
"TLS extension");
return -1;
}
return 0;
}
static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
struct eap_fast_data *data)
{
u8 ciphers[5];
int count = 0;
if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
"provisioning TLS cipher suites");
ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
}
if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
"provisioning TLS cipher suites");
ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
ciphers[count++] = TLS_CIPHER_AES128_SHA;
ciphers[count++] = TLS_CIPHER_RC4_SHA;
}
ciphers[count++] = TLS_CIPHER_NONE;
if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
ciphers)) {
wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
"cipher suites for provisioning");
return -1;
}
return 0;
}
static int eap_fast_process_start(struct eap_sm *sm,
struct eap_fast_data *data, u8 flags,
const u8 *pos, size_t left)
{
const u8 *a_id;
size_t a_id_len;
/* EAP-FAST Version negotiation (section 3.1) */
wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
flags & EAP_TLS_VERSION_MASK, data->fast_version);
if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
data->fast_version = flags & EAP_TLS_VERSION_MASK;
wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
data->fast_version);
a_id = eap_fast_get_a_id(pos, left, &a_id_len);
eap_fast_select_pac(data, a_id, a_id_len);
if (data->resuming && data->current_pac) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
"do not add PAC-Opaque to TLS ClientHello");
if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
return -1;
} else if (data->current_pac) {
/*
* PAC found for the A-ID and we are not resuming an old
* session, so add PAC-Opaque extension to ClientHello.
*/
if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
return -1;
} else {
/* No PAC found, so we must provision one. */
if (!data->provisioning_allowed) {
wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
"provisioning disabled");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
"starting provisioning");
if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
eap_fast_clear_pac_opaque_ext(sm, data) < 0)
return -1;
data->provisioning = 1;
}
return 0;
}
static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
const struct eap_hdr *req;
size_t left;
int res;
u8 flags, id;
struct wpabuf *resp;
const u8 *pos;
struct eap_fast_data *data = priv;
pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
reqData, &left, &flags);
if (pos == NULL)
return NULL;
req = wpabuf_head(reqData);
id = req->identifier;
if (flags & EAP_TLS_FLAGS_START) {
if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
return NULL;
left = 0; /* A-ID is not used in further packet processing */
}
resp = NULL;
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
!data->resuming) {
/* Process tunneled (encrypted) phase 2 data. */
struct wpabuf msg;
wpabuf_set(&msg, pos, left);
res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
if (res < 0) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
/*
* Ack possible Alert that may have caused failure in
* decryption.
*/
res = 1;
}
} else {
/* Continue processing TLS handshake (phase 1). */
res = eap_peer_tls_process_helper(sm, &data->ssl,
EAP_TYPE_FAST,
data->fast_version, id, pos,
left, &resp);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
char cipher[80];
wpa_printf(MSG_DEBUG,
"EAP-FAST: TLS done, proceed to Phase 2");
if (data->provisioning &&
(!(data->provisioning_allowed &
EAP_FAST_PROV_AUTH) ||
tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
cipher, sizeof(cipher)) < 0 ||
os_strstr(cipher, "ADH-") ||
os_strstr(cipher, "anon"))) {
wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
"anonymous (unauthenticated) "
"provisioning");
data->anon_provisioning = 1;
} else
data->anon_provisioning = 0;
data->resuming = 0;
eap_fast_derive_keys(sm, data);
}
if (res == 2) {
struct wpabuf msg;
/*
* Application data included in the handshake message.
*/
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = resp;
resp = NULL;
wpabuf_set(&msg, pos, left);
res = eap_fast_decrypt(sm, data, ret, req, &msg,
&resp);
}
}
if (res == 1) {
wpabuf_free(resp);
return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
data->fast_version);
}
return resp;
}
#if 0 /* FIX */
static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
{
struct eap_fast_data *data = priv;
return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
}
static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_fast_data *data = priv;
os_free(data->key_block_p);
data->key_block_p = NULL;
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = NULL;
}
static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_fast_data *data = priv;
if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
os_free(data);
return NULL;
}
os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
os_memset(data->emsk, 0, EAP_EMSK_LEN);
os_free(data->session_id);
data->session_id = NULL;
if (data->phase2_priv && data->phase2_method &&
data->phase2_method->init_for_reauth)
data->phase2_method->init_for_reauth(sm, data->phase2_priv);
data->phase2_success = 0;
data->resuming = 1;
data->provisioning = 0;
data->anon_provisioning = 0;
data->simck_idx = 0;
return priv;
}
#endif
static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose)
{
struct eap_fast_data *data = priv;
int len, ret;
len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
if (data->phase2_method) {
ret = os_snprintf(buf + len, buflen - len,
"EAP-FAST Phase2 method=%s\n",
data->phase2_method->name);
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
}
return len;
}
static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_fast_data *data = priv;
return data->success;
}
static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_fast_data *data = priv;
u8 *key;
if (!data->success)
return NULL;
key = os_malloc(EAP_FAST_KEY_LEN);
if (key == NULL)
return NULL;
*len = EAP_FAST_KEY_LEN;
os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
return key;
}
static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_fast_data *data = priv;
u8 *id;
if (!data->success)
return NULL;
id = os_malloc(data->id_len);
if (id == NULL)
return NULL;
*len = data->id_len;
os_memcpy(id, data->session_id, data->id_len);
return id;
}
static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_fast_data *data = priv;
u8 *key;
if (!data->success)
return NULL;
key = os_malloc(EAP_EMSK_LEN);
if (key == NULL)
return NULL;
*len = EAP_EMSK_LEN;
os_memcpy(key, data->emsk, EAP_EMSK_LEN);
return key;
}
int eap_peer_fast_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
if (eap == NULL)
return -1;
eap->init = eap_fast_init;
eap->deinit = eap_fast_deinit;
eap->process = eap_fast_process;
eap->isKeyAvailable = eap_fast_isKeyAvailable;
eap->getKey = eap_fast_getKey;
eap->getSessionId = eap_fast_get_session_id;
eap->get_status = eap_fast_get_status;
#if 0
eap->has_reauth_data = eap_fast_has_reauth_data;
eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
eap->init_for_reauth = eap_fast_init_for_reauth;
#endif
eap->get_emsk = eap_fast_get_emsk;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}