/*
* EAP peer method: EAP-TEAP (RFC 7170)
* Copyright (c) 2004-2019, 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 "eap_common/eap_teap_common.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_config.h"
#include "eap_teap_pac.h"
#ifdef EAP_TEAP_DYNAMIC
#include "eap_teap_pac.c"
#endif /* EAP_TEAP_DYNAMIC */
static void eap_teap_deinit(struct eap_sm *sm, void *priv);
struct eap_teap_data {
struct eap_ssl_data ssl;
u8 teap_version; /* Negotiated version */
u8 received_version; /* Version number received during negotiation */
u16 tls_cs;
const struct eap_method *phase2_method;
void *phase2_priv;
int phase2_success;
int inner_method_done;
int result_success_done;
int on_tx_completion;
struct eap_method_type phase2_type;
struct eap_method_type *phase2_types;
size_t num_phase2_types;
int resuming; /* starting a resumed session */
#define EAP_TEAP_PROV_UNAUTH 1
#define EAP_TEAP_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;
int test_outer_tlvs;
u8 key_data[EAP_TEAP_KEY_LEN];
u8 *session_id;
size_t id_len;
u8 emsk[EAP_EMSK_LEN];
int success;
struct eap_teap_pac *pac;
struct eap_teap_pac *current_pac;
size_t max_pac_list_len;
int use_pac_binary_format;
u8 simck_msk[EAP_TEAP_SIMCK_LEN];
u8 simck_emsk[EAP_TEAP_SIMCK_LEN];
int simck_idx;
int cmk_emsk_available;
struct wpabuf *pending_phase2_req;
struct wpabuf *pending_resp;
struct wpabuf *server_outer_tlvs;
struct wpabuf *peer_outer_tlvs;
};
static int eap_teap_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
const u8 *client_random,
const u8 *server_random,
u8 *master_secret)
{
struct eap_teap_data *data = ctx;
wpa_printf(MSG_DEBUG, "EAP-TEAP: SessionTicket callback");
if (!master_secret) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: SessionTicket failed - fall back to full TLS handshake");
data->session_ticket_used = 0;
if (data->provisioning_allowed) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Try to provision a new PAC-Key");
data->provisioning = 1;
data->current_pac = NULL;
}
return 0;
}
wpa_hexdump(MSG_DEBUG, "EAP-TEAP: SessionTicket", ticket, len);
if (!data->current_pac) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: No PAC-Key available for using SessionTicket");
data->session_ticket_used = 0;
return 0;
}
/* EAP-TEAP uses PAC-Key as the TLS master_secret */
os_memcpy(master_secret, data->current_pac->pac_key,
EAP_TEAP_PAC_KEY_LEN);
data->session_ticket_used = 1;
return 1;
}
static void eap_teap_parse_phase1(struct eap_teap_data *data,
const char *phase1)
{
const char *pos;
pos = os_strstr(phase1, "teap_provisioning=");
if (pos) {
data->provisioning_allowed = atoi(pos + 18);
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Automatic PAC provisioning mode: %d",
data->provisioning_allowed);
}
pos = os_strstr(phase1, "teap_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-TEAP: Maximum PAC list length: %lu",
(unsigned long) data->max_pac_list_len);
}
if (os_strstr(phase1, "teap_pac_format=binary")) {
data->use_pac_binary_format = 1;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Using binary format for PAC list");
}
#ifdef CONFIG_TESTING_OPTIONS
if (os_strstr(phase1, "teap_test_outer_tlvs=1"))
data->test_outer_tlvs = 1;
#endif /* CONFIG_TESTING_OPTIONS */
}
static void * eap_teap_init(struct eap_sm *sm)
{
struct eap_teap_data *data;
struct eap_peer_config *config = eap_get_config(sm);
if (!config)
return NULL;
data = os_zalloc(sizeof(*data));
if (!data)
return NULL;
data->teap_version = EAP_TEAP_VERSION;
data->max_pac_list_len = 10;
if (config->phase1)
eap_teap_parse_phase1(data, config->phase1);
if ((data->provisioning_allowed & EAP_TEAP_PROV_AUTH) &&
!config->ca_cert && !config->ca_path) {
/* Prevent PAC provisioning without mutual authentication
* (either by validating server certificate or by suitable
* inner EAP method). */
wpa_printf(MSG_INFO,
"EAP-TEAP: Disable authenticated provisioning due to no ca_cert/ca_path");
data->provisioning_allowed &= ~EAP_TEAP_PROV_AUTH;
}
if (eap_peer_select_phase2_methods(config, "auth=",
&data->phase2_types,
&data->num_phase2_types) < 0) {
eap_teap_deinit(sm, data);
return NULL;
}
data->phase2_type.vendor = EAP_VENDOR_IETF;
data->phase2_type.method = EAP_TYPE_NONE;
config->teap_anon_dh = !!(data->provisioning_allowed &
EAP_TEAP_PROV_UNAUTH);
if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TEAP)) {
wpa_printf(MSG_INFO, "EAP-TEAP: Failed to initialize SSL");
eap_teap_deinit(sm, data);
return NULL;
}
if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
eap_teap_session_ticket_cb,
data) < 0) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Failed to set SessionTicket callback");
eap_teap_deinit(sm, data);
return NULL;
}
if (!config->pac_file) {
wpa_printf(MSG_INFO, "EAP-TEAP: No PAC file configured");
eap_teap_deinit(sm, data);
return NULL;
}
if (data->use_pac_binary_format &&
eap_teap_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
wpa_printf(MSG_INFO, "EAP-TEAP: Failed to load PAC file");
eap_teap_deinit(sm, data);
return NULL;
}
if (!data->use_pac_binary_format &&
eap_teap_load_pac(sm, &data->pac, config->pac_file) < 0) {
wpa_printf(MSG_INFO, "EAP-TEAP: Failed to load PAC file");
eap_teap_deinit(sm, data);
return NULL;
}
eap_teap_pac_list_truncate(data->pac, data->max_pac_list_len);
return data;
}
static void eap_teap_clear(struct eap_teap_data *data)
{
forced_memzero(data->key_data, EAP_TEAP_KEY_LEN);
forced_memzero(data->emsk, EAP_EMSK_LEN);
os_free(data->session_id);
data->session_id = NULL;
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = NULL;
wpabuf_free(data->pending_resp);
data->pending_resp = NULL;
wpabuf_free(data->server_outer_tlvs);
data->server_outer_tlvs = NULL;
wpabuf_free(data->peer_outer_tlvs);
data->peer_outer_tlvs = NULL;
forced_memzero(data->simck_msk, EAP_TEAP_SIMCK_LEN);
forced_memzero(data->simck_emsk, EAP_TEAP_SIMCK_LEN);
}
static void eap_teap_deinit(struct eap_sm *sm, void *priv)
{
struct eap_teap_data *data = priv;
struct eap_teap_pac *pac, *prev;
if (!data)
return;
if (data->phase2_priv && data->phase2_method)
data->phase2_method->deinit(sm, data->phase2_priv);
eap_teap_clear(data);
os_free(data->phase2_types);
eap_peer_tls_ssl_deinit(sm, &data->ssl);
pac = data->pac;
prev = NULL;
while (pac) {
prev = pac;
pac = pac->next;
eap_teap_free_pac(prev);
}
os_free(data);
}
static int eap_teap_derive_msk(struct eap_teap_data *data)
{
/* FIX: RFC 7170 does not describe whether MSK or EMSK based S-IMCK[j]
* is used in this derivation */
if (eap_teap_derive_eap_msk(data->simck_msk, data->key_data) < 0 ||
eap_teap_derive_eap_emsk(data->simck_msk, data->emsk) < 0)
return -1;
data->success = 1;
return 0;
}
static int eap_teap_derive_key_auth(struct eap_sm *sm,
struct eap_teap_data *data)
{
int res;
/* RFC 7170, Section 5.1 */
res = tls_connection_export_key(sm->ssl_ctx, data->ssl.conn,
TEAP_TLS_EXPORTER_LABEL_SKS, NULL, 0,
data->simck_msk, EAP_TEAP_SIMCK_LEN);
if (res)
return res;
wpa_hexdump_key(MSG_DEBUG,
"EAP-TEAP: session_key_seed (S-IMCK[0])",
data->simck_msk, EAP_TEAP_SIMCK_LEN);
os_memcpy(data->simck_emsk, data->simck_msk, EAP_TEAP_SIMCK_LEN);
data->simck_idx = 0;
return 0;
}
static int eap_teap_init_phase2_method(struct eap_sm *sm,
struct eap_teap_data *data)
{
data->inner_method_done = 0;
data->phase2_method =
eap_peer_get_eap_method(data->phase2_type.vendor,
data->phase2_type.method);
if (!data->phase2_method)
return -1;
sm->init_phase2 = 1;
data->phase2_priv = data->phase2_method->init(sm);
sm->init_phase2 = 0;
return data->phase2_priv == NULL ? -1 : 0;
}
static int eap_teap_select_phase2_method(struct eap_teap_data *data, u8 type)
{
size_t i;
/* TODO: TNC with anonymous provisioning; need to require both
* completed inner EAP authentication (EAP-pwd or EAP-EKE) and TNC */
if (data->anon_provisioning &&
!eap_teap_allowed_anon_prov_phase2_method(type)) {
wpa_printf(MSG_INFO,
"EAP-TEAP: EAP type %u not allowed during unauthenticated provisioning",
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-TEAP: 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-TEAP: 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_teap_phase2_request(struct eap_sm *sm,
struct eap_teap_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-TEAP: too short Phase 2 request (len=%lu)",
(unsigned long) len);
return -1;
}
pos = (u8 *) (hdr + 1);
wpa_printf(MSG_DEBUG, "EAP-TEAP: 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-TEAP: 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_teap_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 && eap_teap_init_phase2_method(sm, data) < 0) ||
!data->phase2_method) {
wpa_printf(MSG_INFO,
"EAP-TEAP: 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 (iret.methodState == METHOD_DONE)
data->inner_method_done = 1;
if (!(*resp) ||
(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) && config &&
(config->pending_req_identity || config->pending_req_password ||
config->pending_req_otp || config->pending_req_new_password ||
config->pending_req_sim)) {
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
} else if (!(*resp))
return -1;
return 0;
}
static struct wpabuf * eap_teap_tlv_nak(int vendor_id, int tlv_type)
{
struct wpabuf *buf;
struct teap_tlv_nak *nak;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Add NAK TLV (Vendor-Id %u NAK-Type %u)",
vendor_id, tlv_type);
buf = wpabuf_alloc(sizeof(*nak));
if (!buf)
return NULL;
nak = wpabuf_put(buf, sizeof(*nak));
nak->tlv_type = host_to_be16(TEAP_TLV_MANDATORY | TEAP_TLV_NAK);
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_teap_tlv_pac_ack(void)
{
struct wpabuf *buf;
struct teap_tlv_result *res;
struct teap_tlv_pac_ack *ack;
buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
if (!buf)
return NULL;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Add PAC TLV (ack)");
ack = wpabuf_put(buf, sizeof(*ack));
ack->tlv_type = host_to_be16(TEAP_TLV_PAC | TEAP_TLV_MANDATORY);
ack->length = host_to_be16(sizeof(*ack) - sizeof(struct teap_tlv_hdr));
ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
ack->pac_len = host_to_be16(2);
ack->result = host_to_be16(TEAP_STATUS_SUCCESS);
return buf;
}
static struct wpabuf * eap_teap_process_eap_payload_tlv(
struct eap_sm *sm, struct eap_teap_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-TEAP: 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-TEAP: EAP packet overflow in EAP Payload TLV");
return NULL;
}
if (hdr->code != EAP_CODE_REQUEST) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Unexpected code=%d in Phase 2 EAP header",
hdr->code);
return NULL;
}
if (eap_teap_phase2_request(sm, data, ret, hdr, &resp)) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Phase 2 Request processing failed");
return NULL;
}
return eap_teap_tlv_eap_payload(resp);
}
static struct wpabuf * eap_teap_process_basic_auth_req(
struct eap_sm *sm, struct eap_teap_data *data,
u8 *basic_auth_req, size_t basic_auth_req_len)
{
const u8 *identity, *password;
size_t identity_len, password_len, plen;
struct wpabuf *resp;
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TEAP: Basic-Password-Auth-Req prompt",
basic_auth_req, basic_auth_req_len);
/* TODO: send over control interface */
identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password(sm, &password_len);
if (!identity || !password ||
identity_len > 255 || password_len > 255) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: No username/password suitable for Basic-Password-Auth");
return eap_teap_tlv_nak(0, TEAP_TLV_BASIC_PASSWORD_AUTH_REQ);
}
plen = 1 + identity_len + 1 + password_len;
resp = wpabuf_alloc(sizeof(struct teap_tlv_hdr) + plen);
if (!resp)
return NULL;
eap_teap_put_tlv_hdr(resp, TEAP_TLV_BASIC_PASSWORD_AUTH_RESP, plen);
wpabuf_put_u8(resp, identity_len);
wpabuf_put_data(resp, identity, identity_len);
wpabuf_put_u8(resp, password_len);
wpabuf_put_data(resp, password, password_len);
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TEAP: Basic-Password-Auth-Resp",
resp);
/* Assume this succeeds so that Result TLV(Success) from the server can
* be used to terminate TEAP. */
data->phase2_success = 1;
return resp;
}
static int
eap_teap_validate_crypto_binding(struct eap_teap_data *data,
const struct teap_tlv_crypto_binding *cb)
{
u8 flags, subtype;
subtype = cb->subtype & 0x0f;
flags = cb->subtype >> 4;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Crypto-Binding TLV: Version %u Received Version %u Flags %u Sub-Type %u",
cb->version, cb->received_version, flags, subtype);
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Nonce",
cb->nonce, sizeof(cb->nonce));
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: EMSK Compound MAC",
cb->emsk_compound_mac, sizeof(cb->emsk_compound_mac));
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: MSK Compound MAC",
cb->msk_compound_mac, sizeof(cb->msk_compound_mac));
if (cb->version != EAP_TEAP_VERSION ||
cb->received_version != data->received_version ||
subtype != TEAP_CRYPTO_BINDING_SUBTYPE_REQUEST ||
flags < 1 || flags > 3) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Invalid Version/Flags/Sub-Type in Crypto-Binding TLV: Version %u Received Version %u Flags %u Sub-Type %u",
cb->version, cb->received_version, flags, subtype);
return -1;
}
if (cb->nonce[EAP_TEAP_NONCE_LEN - 1] & 0x01) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Invalid Crypto-Binding TLV Nonce in request");
return -1;
}
return 0;
}
static int eap_teap_write_crypto_binding(
struct eap_teap_data *data,
struct teap_tlv_crypto_binding *rbind,
const struct teap_tlv_crypto_binding *cb,
const u8 *cmk_msk, const u8 *cmk_emsk)
{
u8 subtype, flags;
rbind->tlv_type = host_to_be16(TEAP_TLV_MANDATORY |
TEAP_TLV_CRYPTO_BINDING);
rbind->length = host_to_be16(sizeof(*rbind) -
sizeof(struct teap_tlv_hdr));
rbind->version = EAP_TEAP_VERSION;
rbind->received_version = data->received_version;
/* FIX: RFC 7170 is not clear on which Flags value to use when
* Crypto-Binding TLV is used with Basic-Password-Auth */
flags = cmk_emsk ? TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC :
TEAP_CRYPTO_BINDING_MSK_CMAC;
subtype = TEAP_CRYPTO_BINDING_SUBTYPE_RESPONSE;
rbind->subtype = (flags << 4) | subtype;
os_memcpy(rbind->nonce, cb->nonce, sizeof(cb->nonce));
inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
os_memset(rbind->emsk_compound_mac, 0, EAP_TEAP_COMPOUND_MAC_LEN);
os_memset(rbind->msk_compound_mac, 0, EAP_TEAP_COMPOUND_MAC_LEN);
if (eap_teap_compound_mac(data->tls_cs, rbind, data->server_outer_tlvs,
data->peer_outer_tlvs, cmk_msk,
rbind->msk_compound_mac) < 0)
return -1;
if (cmk_emsk &&
eap_teap_compound_mac(data->tls_cs, rbind, data->server_outer_tlvs,
data->peer_outer_tlvs, cmk_emsk,
rbind->emsk_compound_mac) < 0)
return -1;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Reply Crypto-Binding TLV: Version %u Received Version %u Flags %u SubType %u",
rbind->version, rbind->received_version, flags, subtype);
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Nonce",
rbind->nonce, sizeof(rbind->nonce));
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: EMSK Compound MAC",
rbind->emsk_compound_mac, sizeof(rbind->emsk_compound_mac));
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: MSK Compound MAC",
rbind->msk_compound_mac, sizeof(rbind->msk_compound_mac));
return 0;
}
static int eap_teap_get_cmk(struct eap_sm *sm, struct eap_teap_data *data,
u8 *cmk_msk, u8 *cmk_emsk)
{
u8 *msk = NULL, *emsk = NULL;
size_t msk_len = 0, emsk_len = 0;
int res;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Determining CMK[%d] for Compound MAC calculation",
data->simck_idx + 1);
if (!data->phase2_method)
return eap_teap_derive_cmk_basic_pw_auth(data->simck_msk,
cmk_msk);
if (!data->phase2_method || !data->phase2_priv) {
wpa_printf(MSG_INFO, "EAP-TEAP: Phase 2 method not available");
return -1;
}
if (data->phase2_method->isKeyAvailable &&
!data->phase2_method->isKeyAvailable(sm, data->phase2_priv)) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Phase 2 key material not available");
return -1;
}
if (data->phase2_method->isKeyAvailable &&
data->phase2_method->getKey) {
msk = data->phase2_method->getKey(sm, data->phase2_priv,
&msk_len);
if (!msk) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Could not fetch Phase 2 MSK");
return -1;
}
}
if (data->phase2_method->isKeyAvailable &&
data->phase2_method->get_emsk) {
emsk = data->phase2_method->get_emsk(sm, data->phase2_priv,
&emsk_len);
}
res = eap_teap_derive_imck(data->simck_msk, data->simck_emsk,
msk, msk_len, emsk, emsk_len,
data->simck_msk, cmk_msk,
data->simck_emsk, cmk_emsk);
bin_clear_free(msk, msk_len);
bin_clear_free(emsk, emsk_len);
if (res == 0) {
data->simck_idx++;
if (emsk)
data->cmk_emsk_available = 1;
}
return res;
}
static int eap_teap_session_id(struct eap_teap_data *data)
{
const size_t max_id_len = 100;
int res;
os_free(data->session_id);
data->session_id = os_malloc(max_id_len);
if (!data->session_id)
return -1;
data->session_id[0] = EAP_TYPE_TEAP;
res = tls_get_tls_unique(data->ssl.conn, data->session_id + 1,
max_id_len - 1);
if (res < 0) {
os_free(data->session_id);
data->session_id = NULL;
wpa_printf(MSG_ERROR, "EAP-TEAP: Failed to derive Session-Id");
return -1;
}
data->id_len = 1 + res;
wpa_hexdump(MSG_DEBUG, "EAP-TEAP: Derived Session-Id",
data->session_id, data->id_len);
return 0;
}
static struct wpabuf * eap_teap_process_crypto_binding(
struct eap_sm *sm, struct eap_teap_data *data,
struct eap_method_ret *ret,
const struct teap_tlv_crypto_binding *cb, size_t bind_len)
{
struct wpabuf *resp;
u8 *pos;
u8 cmk_msk[EAP_TEAP_CMK_LEN];
u8 cmk_emsk[EAP_TEAP_CMK_LEN];
const u8 *cmk_emsk_ptr = NULL;
int res;
size_t len;
u8 flags;
if (eap_teap_validate_crypto_binding(data, cb) < 0 ||
eap_teap_get_cmk(sm, data, cmk_msk, cmk_emsk) < 0)
return NULL;
/* Validate received MSK/EMSK Compound MAC */
flags = cb->subtype >> 4;
if (flags == TEAP_CRYPTO_BINDING_MSK_CMAC ||
flags == TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC) {
u8 msk_compound_mac[EAP_TEAP_COMPOUND_MAC_LEN];
if (eap_teap_compound_mac(data->tls_cs, cb,
data->server_outer_tlvs,
data->peer_outer_tlvs, cmk_msk,
msk_compound_mac) < 0)
return NULL;
res = os_memcmp_const(msk_compound_mac, cb->msk_compound_mac,
EAP_TEAP_COMPOUND_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Received MSK Compound MAC",
cb->msk_compound_mac, EAP_TEAP_COMPOUND_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP,
"EAP-TEAP: Calculated MSK Compound MAC",
msk_compound_mac, EAP_TEAP_COMPOUND_MAC_LEN);
if (res != 0) {
wpa_printf(MSG_INFO,
"EAP-TEAP: MSK Compound MAC did not match");
return NULL;
}
}
if ((flags == TEAP_CRYPTO_BINDING_EMSK_CMAC ||
flags == TEAP_CRYPTO_BINDING_EMSK_AND_MSK_CMAC) &&
data->cmk_emsk_available) {
u8 emsk_compound_mac[EAP_TEAP_COMPOUND_MAC_LEN];
if (eap_teap_compound_mac(data->tls_cs, cb,
data->server_outer_tlvs,
data->peer_outer_tlvs, cmk_emsk,
emsk_compound_mac) < 0)
return NULL;
res = os_memcmp_const(emsk_compound_mac, cb->emsk_compound_mac,
EAP_TEAP_COMPOUND_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Received EMSK Compound MAC",
cb->emsk_compound_mac, EAP_TEAP_COMPOUND_MAC_LEN);
wpa_hexdump(MSG_MSGDUMP,
"EAP-TEAP: Calculated EMSK Compound MAC",
emsk_compound_mac, EAP_TEAP_COMPOUND_MAC_LEN);
if (res != 0) {
wpa_printf(MSG_INFO,
"EAP-TEAP: EMSK Compound MAC did not match");
return NULL;
}
cmk_emsk_ptr = cmk_emsk;
}
if (flags == TEAP_CRYPTO_BINDING_EMSK_CMAC &&
!data->cmk_emsk_available) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Server included only EMSK Compound MAC, but no locally generated inner EAP EMSK to validate this");
return NULL;
}
/*
* Compound MAC was valid, so authentication succeeded. Reply with
* crypto binding to allow server to complete authentication.
*/
len = sizeof(struct teap_tlv_crypto_binding);
resp = wpabuf_alloc(len);
if (!resp)
return NULL;
if (data->phase2_success && eap_teap_derive_msk(data) < 0) {
wpa_printf(MSG_INFO, "EAP-TEAP: Failed to generate MSK");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
data->phase2_success = 0;
wpabuf_free(resp);
return NULL;
}
if (data->phase2_success && eap_teap_session_id(data) < 0) {
wpabuf_free(resp);
return NULL;
}
pos = wpabuf_put(resp, sizeof(struct teap_tlv_crypto_binding));
if (eap_teap_write_crypto_binding(
data, (struct teap_tlv_crypto_binding *) pos,
cb, cmk_msk, cmk_emsk_ptr) < 0) {
wpabuf_free(resp);
return NULL;
}
return resp;
}
static void eap_teap_parse_pac_tlv(struct eap_teap_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-TEAP: PAC-Key", pos, len);
if (len != EAP_TEAP_PAC_KEY_LEN) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: 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-TEAP: PAC-Opaque", pos, len);
entry->pac_opaque = pos;
entry->pac_opaque_len = len;
break;
case PAC_TYPE_PAC_INFO:
wpa_hexdump(MSG_DEBUG, "EAP-TEAP: PAC-Info", pos, len);
entry->pac_info = pos;
entry->pac_info_len = len;
break;
default:
wpa_printf(MSG_DEBUG, "EAP-TEAP: Ignored unknown PAC type %d",
type);
break;
}
}
static int eap_teap_process_pac_tlv(struct eap_teap_pac *entry,
u8 *pac, size_t pac_len)
{
struct pac_attr_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_attr_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-TEAP: PAC TLV overrun (type=%d len=%lu left=%lu)",
type, (unsigned long) len,
(unsigned long) left);
return -1;
}
eap_teap_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-TEAP: PAC TLV does not include all the required fields");
return -1;
}
return 0;
}
static int eap_teap_parse_pac_info(struct eap_teap_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-TEAP: 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-TEAP: 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-TEAP: 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-TEAP: 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-TEAP: 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 7170, Section 4.2.12.6 - PAC-Type TLV */
if (len != 2) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Invalid PAC-Type length %lu (expected 2)",
(unsigned long) len);
wpa_hexdump_ascii(MSG_DEBUG,
"EAP-TEAP: PAC-Info - PAC-Type",
pos, len);
return -1;
}
pac_type = WPA_GET_BE16(pos);
if (pac_type != PAC_TYPE_TUNNEL_PAC) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Unsupported PAC Type %d",
pac_type);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-TEAP: PAC-Info - PAC-Type %d",
pac_type);
entry->pac_type = pac_type;
break;
default:
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Ignored unknown PAC-Info type %d", type);
break;
}
return 0;
}
static int eap_teap_process_pac_info(struct eap_teap_pac *entry)
{
struct pac_attr_hdr *hdr;
u8 *pos;
size_t left, len;
int type;
/* RFC 7170, Section 4.2.12.4 */
/* 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_attr_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-TEAP: PAC-Info overrun (type=%d len=%lu left=%lu)",
type, (unsigned long) len,
(unsigned long) left);
return -1;
}
if (eap_teap_parse_pac_info(entry, type, pos, len) < 0)
return -1;
pos += len;
left -= len;
}
if (!entry->a_id || !entry->a_id_info) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: PAC-Info does not include all the required fields");
return -1;
}
return 0;
}
static struct wpabuf * eap_teap_process_pac(struct eap_sm *sm,
struct eap_teap_data *data,
struct eap_method_ret *ret,
u8 *pac, size_t pac_len)
{
struct eap_peer_config *config = eap_get_config(sm);
struct eap_teap_pac entry;
os_memset(&entry, 0, sizeof(entry));
if (eap_teap_process_pac_tlv(&entry, pac, pac_len) ||
eap_teap_process_pac_info(&entry))
return NULL;
eap_teap_add_pac(&data->pac, &data->current_pac, &entry);
eap_teap_pac_list_truncate(data->pac, data->max_pac_list_len);
if (data->use_pac_binary_format)
eap_teap_save_pac_bin(sm, data->pac, config->pac_file);
else
eap_teap_save_pac(sm, data->pac, config->pac_file);
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Send PAC-Acknowledgement - %s initiated provisioning completed successfully",
data->provisioning ? "peer" : "server");
return eap_teap_tlv_pac_ack();
}
static int eap_teap_parse_decrypted(struct wpabuf *decrypted,
struct eap_teap_tlv_parse *tlv,
struct wpabuf **resp)
{
u16 tlv_type;
int mandatory, 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 (end - pos >= 4) {
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-TEAP: TLV overflow");
return -1;
}
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Received Phase 2: TLV type %u (%s) length %u%s",
tlv_type, eap_teap_tlv_type_str(tlv_type),
(unsigned int) len,
mandatory ? " (mandatory)" : "");
res = eap_teap_parse_tlv(tlv, tlv_type, pos, len);
if (res == -2)
break;
if (res < 0) {
if (mandatory) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: NAK unknown mandatory TLV type %u",
tlv_type);
*resp = eap_teap_tlv_nak(0, tlv_type);
break;
}
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Ignore unknown optional TLV type %u",
tlv_type);
}
pos += len;
}
return 0;
}
static struct wpabuf * eap_teap_pac_request(void)
{
struct wpabuf *req;
struct teap_tlv_request_action *act;
struct teap_tlv_hdr *pac;
struct teap_attr_pac_type *type;
req = wpabuf_alloc(sizeof(*act) + sizeof(*pac) + sizeof(*type));
if (!req)
return NULL;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Add Request Action TLV (Process TLV)");
act = wpabuf_put(req, sizeof(*act));
act->tlv_type = host_to_be16(TEAP_TLV_REQUEST_ACTION);
act->length = host_to_be16(2);
act->status = TEAP_STATUS_SUCCESS;
act->action = TEAP_REQUEST_ACTION_PROCESS_TLV;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Add PAC TLV (PAC-Type = Tunnel)");
pac = wpabuf_put(req, sizeof(*pac));
pac->tlv_type = host_to_be16(TEAP_TLV_PAC);
pac->length = host_to_be16(sizeof(*type));
type = wpabuf_put(req, sizeof(*type));
type->type = host_to_be16(PAC_TYPE_PAC_TYPE);
type->length = host_to_be16(2);
type->pac_type = host_to_be16(PAC_TYPE_TUNNEL_PAC);
return req;
}
static int eap_teap_process_decrypted(struct eap_sm *sm,
struct eap_teap_data *data,
struct eap_method_ret *ret,
u8 identifier,
struct wpabuf *decrypted,
struct wpabuf **out_data)
{
struct wpabuf *resp = NULL, *tmp;
struct eap_teap_tlv_parse tlv;
int failed = 0;
enum teap_error_codes error = 0;
if (eap_teap_parse_decrypted(decrypted, &tlv, &resp) < 0) {
/* Parsing failed - no response available */
return 0;
}
if (resp) {
/* Parsing rejected the message - send out an error response */
goto send_resp;
}
if (tlv.result == TEAP_STATUS_FAILURE) {
/* Server indicated failure - respond similarly per
* RFC 7170, 3.6.3. This authentication exchange cannot succeed
* and will be terminated with a cleartext EAP Failure. */
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Server rejected authentication");
resp = eap_teap_tlv_result(TEAP_STATUS_FAILURE, 0);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
goto send_resp;
}
if ((tlv.iresult == TEAP_STATUS_SUCCESS ||
(!data->result_success_done &&
tlv.result == TEAP_STATUS_SUCCESS)) &&
!tlv.crypto_binding) {
/* Result TLV or Intermediate-Result TLV indicating success,
* but no Crypto-Binding TLV */
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Result TLV or Intermediate-Result TLV indicating success, but no Crypto-Binding TLV");
failed = 1;
error = TEAP_ERROR_TUNNEL_COMPROMISE_ERROR;
goto done;
}
if (tlv.iresult != TEAP_STATUS_SUCCESS &&
tlv.iresult != TEAP_STATUS_FAILURE &&
data->inner_method_done) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Inner EAP method exchange completed, but no Intermediate-Result TLV included");
failed = 1;
error = TEAP_ERROR_TUNNEL_COMPROMISE_ERROR;
goto done;
}
if (tlv.basic_auth_req) {
tmp = eap_teap_process_basic_auth_req(sm, data,
tlv.basic_auth_req,
tlv.basic_auth_req_len);
if (!tmp)
failed = 1;
resp = wpabuf_concat(resp, tmp);
} else if (tlv.eap_payload_tlv) {
tmp = eap_teap_process_eap_payload_tlv(sm, data, ret,
tlv.eap_payload_tlv,
tlv.eap_payload_tlv_len);
if (!tmp)
failed = 1;
resp = wpabuf_concat(resp, tmp);
if (tlv.iresult == TEAP_STATUS_SUCCESS ||
tlv.iresult == TEAP_STATUS_FAILURE) {
tmp = eap_teap_tlv_result(failed ?
TEAP_STATUS_FAILURE :
TEAP_STATUS_SUCCESS, 1);
resp = wpabuf_concat(resp, tmp);
if (tlv.iresult == TEAP_STATUS_FAILURE)
failed = 1;
}
}
if (tlv.crypto_binding) {
if (tlv.iresult != TEAP_STATUS_SUCCESS &&
tlv.result != TEAP_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Unexpected Crypto-Binding TLV without Result TLV or Intermediate-Result TLV indicating success");
failed = 1;
error = TEAP_ERROR_UNEXPECTED_TLVS_EXCHANGED;
goto done;
}
tmp = eap_teap_process_crypto_binding(sm, data, ret,
tlv.crypto_binding,
tlv.crypto_binding_len);
if (!tmp) {
failed = 1;
error = TEAP_ERROR_TUNNEL_COMPROMISE_ERROR;
} else {
resp = wpabuf_concat(resp, tmp);
if (tlv.result == TEAP_STATUS_SUCCESS && !failed)
data->result_success_done = 1;
if (tlv.iresult == TEAP_STATUS_SUCCESS && !failed)
data->inner_method_done = 0;
}
}
if (data->result_success_done && data->session_ticket_used &&
eap_teap_derive_msk(data) == 0) {
/* Assume the server might accept authentication without going
* through inner authentication. */
wpa_printf(MSG_DEBUG,
"EAP-TEAP: PAC used - server may decide to skip inner authentication");
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
}
if (tlv.pac) {
if (tlv.result == TEAP_STATUS_SUCCESS) {
tmp = eap_teap_process_pac(sm, data, ret,
tlv.pac, tlv.pac_len);
resp = wpabuf_concat(resp, tmp);
} else {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: PAC TLV without Result TLV acknowledging success");
failed = 1;
error = TEAP_ERROR_UNEXPECTED_TLVS_EXCHANGED;
}
}
if (!data->current_pac && data->provisioning && !failed && !tlv.pac &&
tlv.crypto_binding &&
(!data->anon_provisioning ||
(data->phase2_success && data->phase2_method &&
data->phase2_method->vendor == 0 &&
eap_teap_allowed_anon_prov_cipher_suite(data->tls_cs) &&
eap_teap_allowed_anon_prov_phase2_method(
data->phase2_method->method))) &&
(tlv.iresult == TEAP_STATUS_SUCCESS ||
tlv.result == TEAP_STATUS_SUCCESS)) {
/*
* Need to request Tunnel PAC when using authenticated
* provisioning.
*/
wpa_printf(MSG_DEBUG, "EAP-TEAP: Request Tunnel PAC");
tmp = eap_teap_pac_request();
resp = wpabuf_concat(resp, tmp);
}
done:
if (failed) {
tmp = eap_teap_tlv_result(TEAP_STATUS_FAILURE, 0);
resp = wpabuf_concat(tmp, resp);
if (error != 0) {
tmp = eap_teap_tlv_error(error);
resp = wpabuf_concat(tmp, resp);
}
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
} else if (tlv.result == TEAP_STATUS_SUCCESS) {
tmp = eap_teap_tlv_result(TEAP_STATUS_SUCCESS, 0);
resp = wpabuf_concat(tmp, resp);
}
if (resp && tlv.result == TEAP_STATUS_SUCCESS && !failed &&
tlv.crypto_binding && data->phase2_success) {
/* Successfully completed Phase 2 */
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Authentication completed successfully");
ret->methodState = METHOD_MAY_CONT;
data->on_tx_completion = data->provisioning ?
METHOD_MAY_CONT : METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
}
if (!resp) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: No recognized TLVs - send empty response packet");
resp = wpabuf_alloc(1);
}
send_resp:
if (!resp)
return 0;
wpa_hexdump_buf(MSG_DEBUG, "EAP-TEAP: Encrypting Phase 2 data", resp);
if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TEAP,
data->teap_version, identifier,
resp, out_data)) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Failed to encrypt a Phase 2 frame");
}
wpabuf_free(resp);
return 0;
}
static int eap_teap_decrypt(struct eap_sm *sm, struct eap_teap_data *data,
struct eap_method_ret *ret, u8 identifier,
const struct wpabuf *in_data,
struct wpabuf **out_data)
{
struct wpabuf *in_decrypted;
int res;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Received %lu bytes encrypted data for Phase 2",
(unsigned long) wpabuf_len(in_data));
if (data->pending_phase2_req) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: 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 */
res = eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TEAP,
data->teap_version,
identifier, NULL, out_data);
if (res == 0 && !data->ssl.tls_out &&
data->on_tx_completion) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Mark authentication completed at full TX of fragments");
ret->methodState = data->on_tx_completion;
data->on_tx_completion = 0;
ret->decision = DECISION_UNCOND_SUCC;
}
return res;
}
res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
if (res)
return res;
continue_req:
wpa_hexdump_buf(MSG_MSGDUMP, "EAP-TEAP: Decrypted Phase 2 TLV(s)",
in_decrypted);
if (wpabuf_len(in_decrypted) < 4) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Too short Phase 2 TLV frame (len=%lu)",
(unsigned long) wpabuf_len(in_decrypted));
wpabuf_free(in_decrypted);
return -1;
}
res = eap_teap_process_decrypted(sm, data, ret, identifier,
in_decrypted, out_data);
wpabuf_free(in_decrypted);
return res;
}
static void eap_teap_select_pac(struct eap_teap_data *data,
const u8 *a_id, size_t a_id_len)
{
if (!a_id)
return;
data->current_pac = eap_teap_get_pac(data->pac, a_id, a_id_len,
PAC_TYPE_TUNNEL_PAC);
if (data->current_pac) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: PAC found for this A-ID (PAC-Type %d)",
data->current_pac->pac_type);
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TEAP: A-ID-Info",
data->current_pac->a_id_info,
data->current_pac->a_id_info_len);
}
}
static int eap_teap_use_pac_opaque(struct eap_sm *sm,
struct eap_teap_data *data,
struct eap_teap_pac *pac)
{
u8 *tlv;
size_t tlv_len, olen;
struct teap_tlv_hdr *ehdr;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Add PAC-Opaque TLS extension");
olen = pac->pac_opaque_len;
tlv_len = sizeof(*ehdr) + olen;
tlv = os_malloc(tlv_len);
if (tlv) {
ehdr = (struct teap_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 ||
tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
TLS_EXT_PAC_OPAQUE,
tlv, tlv_len) < 0) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Failed to add PAC-Opaque TLS extension");
os_free(tlv);
return -1;
}
os_free(tlv);
return 0;
}
static int eap_teap_clear_pac_opaque_ext(struct eap_sm *sm,
struct eap_teap_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-TEAP: Failed to remove PAC-Opaque TLS extension");
return -1;
}
return 0;
}
static int eap_teap_process_start(struct eap_sm *sm,
struct eap_teap_data *data, u8 flags,
const u8 *pos, size_t left)
{
const u8 *a_id = NULL;
size_t a_id_len = 0;
/* TODO: Support (mostly theoretical) case of TEAP/Start request being
* fragmented */
/* EAP-TEAP version negotiation (RFC 7170, Section 3.2) */
data->received_version = flags & EAP_TLS_VERSION_MASK;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Start (server ver=%u, own ver=%u)",
data->received_version, data->teap_version);
if (data->received_version < 1) {
/* Version 1 was the first defined version, so reject 0 */
wpa_printf(MSG_INFO,
"EAP-TEAP: Server used unknown TEAP version %u",
data->received_version);
return -1;
}
if (data->received_version < data->teap_version)
data->teap_version = data->received_version;
wpa_printf(MSG_DEBUG, "EAP-TEAP: Using TEAP version %d",
data->teap_version);
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Start message payload", pos, left);
/* Parse Authority-ID TLV from Outer TLVs, if present */
if (flags & EAP_TEAP_FLAGS_OUTER_TLV_LEN) {
const u8 *outer_pos, *outer_end;
u32 outer_tlv_len;
if (left < 4) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Not enough room for the Outer TLV Length field");
return -1;
}
outer_tlv_len = WPA_GET_BE32(pos);
pos += 4;
left -= 4;
if (outer_tlv_len > left) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Truncated Outer TLVs field (Outer TLV Length: %u; remaining buffer: %u)",
outer_tlv_len, (unsigned int) left);
return -1;
}
outer_pos = pos + left - outer_tlv_len;
outer_end = outer_pos + outer_tlv_len;
wpa_hexdump(MSG_MSGDUMP, "EAP-TEAP: Start message Outer TLVs",
outer_pos, outer_tlv_len);
wpabuf_free(data->server_outer_tlvs);
data->server_outer_tlvs = wpabuf_alloc_copy(outer_pos,
outer_tlv_len);
if (!data->server_outer_tlvs)
return -1;
left -= outer_tlv_len;
if (left > 0) {
wpa_hexdump(MSG_INFO,
"EAP-TEAP: Unexpected TLS Data in Start message",
pos, left);
return -1;
}
while (outer_pos < outer_end) {
u16 tlv_type, tlv_len;
if (outer_end - outer_pos < 4) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Truncated Outer TLV header");
return -1;
}
tlv_type = WPA_GET_BE16(outer_pos);
outer_pos += 2;
tlv_len = WPA_GET_BE16(outer_pos);
outer_pos += 2;
/* Outer TLVs are required to be optional, so no need to
* check the M flag */
tlv_type &= TEAP_TLV_TYPE_MASK;
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Outer TLV: Type=%u Length=%u",
tlv_type, tlv_len);
if (outer_end - outer_pos < tlv_len) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Truncated Outer TLV (Type %u)",
tlv_type);
return -1;
}
if (tlv_type == TEAP_TLV_AUTHORITY_ID) {
wpa_hexdump(MSG_DEBUG, "EAP-TEAP: Authority-ID",
outer_pos, tlv_len);
if (a_id) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Multiple Authority-ID TLVs in TEAP/Start");
return -1;
}
a_id = outer_pos;
a_id_len = tlv_len;
} else {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Ignore unknown Outer TLV (Type %u)",
tlv_type);
}
outer_pos += tlv_len;
}
} else if (left > 0) {
wpa_hexdump(MSG_INFO,
"EAP-TEAP: Unexpected TLS Data in Start message",
pos, left);
return -1;
}
eap_teap_select_pac(data, a_id, a_id_len);
if (data->resuming && data->current_pac) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Trying to resume session - do not add PAC-Opaque to TLS ClientHello");
if (eap_teap_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_teap_use_pac_opaque(sm, data, data->current_pac) < 0)
return -1;
} else if (data->provisioning_allowed) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: No PAC found - starting provisioning");
if (eap_teap_clear_pac_opaque_ext(sm, data) < 0)
return -1;
data->provisioning = 1;
}
return 0;
}
#ifdef CONFIG_TESTING_OPTIONS
static struct wpabuf * eap_teap_add_dummy_outer_tlvs(struct eap_teap_data *data,
struct wpabuf *resp)
{
struct wpabuf *resp2;
u16 len;
const u8 *pos;
u8 flags;
wpabuf_free(data->peer_outer_tlvs);
data->peer_outer_tlvs = wpabuf_alloc(4 + 4);
if (!data->peer_outer_tlvs) {
wpabuf_free(resp);
return NULL;
}
/* Outer TLVs (dummy Vendor-Specific TLV for testing) */
wpabuf_put_be16(data->peer_outer_tlvs, TEAP_TLV_VENDOR_SPECIFIC);
wpabuf_put_be16(data->peer_outer_tlvs, 4);
wpabuf_put_be32(data->peer_outer_tlvs, EAP_VENDOR_HOSTAP);
wpa_hexdump_buf(MSG_DEBUG, "EAP-TEAP: TESTING - Add dummy Outer TLVs",
data->peer_outer_tlvs);
wpa_hexdump_buf(MSG_DEBUG,
"EAP-TEAP: TEAP/Start response before modification",
resp);
resp2 = wpabuf_alloc(wpabuf_len(resp) + 4 +
wpabuf_len(data->peer_outer_tlvs));
if (!resp2) {
wpabuf_free(resp);
return NULL;
}
pos = wpabuf_head(resp);
wpabuf_put_u8(resp2, *pos++); /* Code */
wpabuf_put_u8(resp2, *pos++); /* Identifier */
len = WPA_GET_BE16(pos);
pos += 2;
wpabuf_put_be16(resp2, len + 4 + wpabuf_len(data->peer_outer_tlvs));
wpabuf_put_u8(resp2, *pos++); /* Type */
/* Flags | Ver (with Outer TLV length included flag set to 1) */
flags = *pos++;
if (flags & (EAP_TEAP_FLAGS_OUTER_TLV_LEN |
EAP_TLS_FLAGS_LENGTH_INCLUDED)) {
wpa_printf(MSG_INFO,
"EAP-TEAP: Cannot add Outer TLVs for testing");
wpabuf_free(resp);
wpabuf_free(resp2);
return NULL;
}
flags |= EAP_TEAP_FLAGS_OUTER_TLV_LEN;
wpabuf_put_u8(resp2, flags);
/* Outer TLV Length */
wpabuf_put_be32(resp2, wpabuf_len(data->peer_outer_tlvs));
/* TLS Data */
wpabuf_put_data(resp2, pos, wpabuf_len(resp) - 6);
wpabuf_put_buf(resp2, data->peer_outer_tlvs); /* Outer TLVs */
wpabuf_free(resp);
wpa_hexdump_buf(MSG_DEBUG,
"EAP-TEAP: TEAP/Start response after modification",
resp2);
return resp2;
}
#endif /* CONFIG_TESTING_OPTIONS */
static struct wpabuf * eap_teap_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_teap_data *data = priv;
struct wpabuf msg;
pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TEAP, ret,
reqData, &left, &flags);
if (!pos)
return NULL;
req = wpabuf_head(reqData);
id = req->identifier;
if (flags & EAP_TLS_FLAGS_START) {
if (eap_teap_process_start(sm, data, flags, pos, left) < 0)
return NULL;
/* Outer TLVs are not used in further packet processing and
* there cannot be TLS Data in this TEAP/Start message, so
* enforce that by ignoring whatever data might remain in the
* buffer. */
left = 0;
} else if (flags & EAP_TEAP_FLAGS_OUTER_TLV_LEN) {
/* TODO: RFC 7170, Section 4.3.1 indicates that the unexpected
* Outer TLVs MUST be ignored instead of ignoring the full
* message. */
wpa_printf(MSG_INFO,
"EAP-TEAP: Outer TLVs present in non-Start message -> ignore message");
return NULL;
}
wpabuf_set(&msg, pos, left);
resp = NULL;
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
!data->resuming) {
/* Process tunneled (encrypted) phase 2 data. */
res = eap_teap_decrypt(sm, data, ret, id, &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 {
if (sm->waiting_ext_cert_check && data->pending_resp) {
struct eap_peer_config *config = eap_get_config(sm);
if (config->pending_ext_cert_check ==
EXT_CERT_CHECK_GOOD) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: External certificate check succeeded - continue handshake");
resp = data->pending_resp;
data->pending_resp = NULL;
sm->waiting_ext_cert_check = 0;
return resp;
}
if (config->pending_ext_cert_check ==
EXT_CERT_CHECK_BAD) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: External certificate check failed - force authentication failure");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
sm->waiting_ext_cert_check = 0;
return NULL;
}
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Continuing to wait external server certificate validation");
return NULL;
}
/* Continue processing TLS handshake (phase 1). */
res = eap_peer_tls_process_helper(sm, &data->ssl,
EAP_TYPE_TEAP,
data->teap_version, id, &msg,
&resp);
if (res < 0) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: TLS processing failed");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return resp;
}
if (sm->waiting_ext_cert_check) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Waiting external server certificate validation");
wpabuf_free(data->pending_resp);
data->pending_resp = resp;
return NULL;
}
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
char cipher[80];
wpa_printf(MSG_DEBUG,
"EAP-TEAP: TLS done, proceed to Phase 2");
data->tls_cs =
tls_connection_get_cipher_suite(data->ssl.conn);
wpa_printf(MSG_DEBUG,
"EAP-TEAP: TLS cipher suite 0x%04x",
data->tls_cs);
if (data->provisioning &&
(!(data->provisioning_allowed &
EAP_TEAP_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-TEAP: Using anonymous (unauthenticated) provisioning");
data->anon_provisioning = 1;
} else {
data->anon_provisioning = 0;
}
data->resuming = 0;
if (eap_teap_derive_key_auth(sm, data) < 0) {
wpa_printf(MSG_DEBUG,
"EAP-TEAP: Could not derive keys");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
wpabuf_free(resp);
return NULL;
}
}
if (res == 2) {
/*
* Application data included in the handshake message.
*/
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = resp;
resp = NULL;
res = eap_teap_decrypt(sm, data, ret, id, &msg, &resp);
}
}
if (res == 1) {
wpabuf_free(resp);
return eap_peer_tls_build_ack(id, EAP_TYPE_TEAP,
data->teap_version);
}
#ifdef CONFIG_TESTING_OPTIONS
if (data->test_outer_tlvs && res == 0 && resp &&
(flags & EAP_TLS_FLAGS_START) && wpabuf_len(resp) >= 6)
resp = eap_teap_add_dummy_outer_tlvs(data, resp);
#endif /* CONFIG_TESTING_OPTIONS */
return resp;
}
#if 0 /* TODO */
static Boolean eap_teap_has_reauth_data(struct eap_sm *sm, void *priv)
{
struct eap_teap_data *data = priv;
return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
}
static void eap_teap_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_teap_data *data = priv;
if (data->phase2_priv && data->phase2_method &&
data->phase2_method->deinit_for_reauth)
data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
eap_teap_clear(data);
}
static void * eap_teap_init_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_teap_data *data = priv;
if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
eap_teap_deinit(sm, data);
return 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->inner_method_done = 0;
data->result_success_done = 0;
data->done_on_tx_completion = 0;
data->resuming = 1;
data->provisioning = 0;
data->anon_provisioning = 0;
data->simck_idx = 0;
return priv;
}
#endif
static int eap_teap_get_status(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose)
{
struct eap_teap_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-TEAP Phase 2 method=%s\n",
data->phase2_method->name);
if (os_snprintf_error(buflen - len, ret))
return len;
len += ret;
}
return len;
}
static Boolean eap_teap_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_teap_data *data = priv;
return data->success;
}
static u8 * eap_teap_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_teap_data *data = priv;
u8 *key;
if (!data->success)
return NULL;
key = os_memdup(data->key_data, EAP_TEAP_KEY_LEN);
if (!key)
return NULL;
*len = EAP_TEAP_KEY_LEN;
return key;
}
static u8 * eap_teap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_teap_data *data = priv;
u8 *id;
if (!data->success || !data->session_id)
return NULL;
id = os_memdup(data->session_id, data->id_len);
if (!id)
return NULL;
*len = data->id_len;
return id;
}
static u8 * eap_teap_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_teap_data *data = priv;
u8 *key;
if (!data->success)
return NULL;
key = os_memdup(data->emsk, EAP_EMSK_LEN);
if (!key)
return NULL;
*len = EAP_EMSK_LEN;
return key;
}
int eap_peer_teap_register(void)
{
struct eap_method *eap;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_TEAP, "TEAP");
if (!eap)
return -1;
eap->init = eap_teap_init;
eap->deinit = eap_teap_deinit;
eap->process = eap_teap_process;
eap->isKeyAvailable = eap_teap_isKeyAvailable;
eap->getKey = eap_teap_getKey;
eap->getSessionId = eap_teap_get_session_id;
eap->get_status = eap_teap_get_status;
#if 0 /* TODO */
eap->has_reauth_data = eap_teap_has_reauth_data;
eap->deinit_for_reauth = eap_teap_deinit_for_reauth;
eap->init_for_reauth = eap_teap_init_for_reauth;
#endif
eap->get_emsk = eap_teap_get_emsk;
return eap_peer_method_register(eap);
}