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freebsd-nq/contrib/wpa_supplicant/eap.c
Sam Leffler 7700b89cce Import of WPA supplicant 0.5.8
2007-07-11 15:48:36 +00:00

2121 lines
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/*
* EAP peer state machines (RFC 4137)
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*
* This file implements the Peer State Machine as defined in RFC 4137. The used
* states and state transitions match mostly with the RFC. However, there are
* couple of additional transitions for working around small issues noticed
* during testing. These exceptions are explained in comments within the
* functions in this file. The method functions, m.func(), are similar to the
* ones used in RFC 4137, but some small changes have used here to optimize
* operations and to add functionality needed for fast re-authentication
* (session resumption).
*/
#include "includes.h"
#include "common.h"
#include "eap_i.h"
#include "config_ssid.h"
#include "tls.h"
#include "crypto.h"
#include "pcsc_funcs.h"
#include "wpa_ctrl.h"
#include "state_machine.h"
#define STATE_MACHINE_DATA struct eap_sm
#define STATE_MACHINE_DEBUG_PREFIX "EAP"
#define EAP_MAX_AUTH_ROUNDS 50
static Boolean eap_sm_allowMethod(struct eap_sm *sm, int vendor,
EapType method);
static u8 * eap_sm_buildNak(struct eap_sm *sm, int id, size_t *len);
static void eap_sm_processIdentity(struct eap_sm *sm, const u8 *req);
static void eap_sm_processNotify(struct eap_sm *sm, const u8 *req);
static u8 * eap_sm_buildNotify(int id, size_t *len);
static void eap_sm_parseEapReq(struct eap_sm *sm, const u8 *req, size_t len);
#if defined(CONFIG_CTRL_IFACE) || !defined(CONFIG_NO_STDOUT_DEBUG)
static const char * eap_sm_method_state_txt(EapMethodState state);
static const char * eap_sm_decision_txt(EapDecision decision);
#endif /* CONFIG_CTRL_IFACE || !CONFIG_NO_STDOUT_DEBUG */
static Boolean eapol_get_bool(struct eap_sm *sm, enum eapol_bool_var var)
{
return sm->eapol_cb->get_bool(sm->eapol_ctx, var);
}
static void eapol_set_bool(struct eap_sm *sm, enum eapol_bool_var var,
Boolean value)
{
sm->eapol_cb->set_bool(sm->eapol_ctx, var, value);
}
static unsigned int eapol_get_int(struct eap_sm *sm, enum eapol_int_var var)
{
return sm->eapol_cb->get_int(sm->eapol_ctx, var);
}
static void eapol_set_int(struct eap_sm *sm, enum eapol_int_var var,
unsigned int value)
{
sm->eapol_cb->set_int(sm->eapol_ctx, var, value);
}
static u8 * eapol_get_eapReqData(struct eap_sm *sm, size_t *len)
{
return sm->eapol_cb->get_eapReqData(sm->eapol_ctx, len);
}
static void eap_deinit_prev_method(struct eap_sm *sm, const char *txt)
{
if (sm->m == NULL || sm->eap_method_priv == NULL)
return;
wpa_printf(MSG_DEBUG, "EAP: deinitialize previously used EAP method "
"(%d, %s) at %s", sm->selectedMethod, sm->m->name, txt);
sm->m->deinit(sm, sm->eap_method_priv);
sm->eap_method_priv = NULL;
sm->m = NULL;
}
/*
* This state initializes state machine variables when the machine is
* activated (portEnabled = TRUE). This is also used when re-starting
* authentication (eapRestart == TRUE).
*/
SM_STATE(EAP, INITIALIZE)
{
SM_ENTRY(EAP, INITIALIZE);
if (sm->fast_reauth && sm->m && sm->m->has_reauth_data &&
sm->m->has_reauth_data(sm, sm->eap_method_priv)) {
wpa_printf(MSG_DEBUG, "EAP: maintaining EAP method data for "
"fast reauthentication");
sm->m->deinit_for_reauth(sm, sm->eap_method_priv);
} else {
eap_deinit_prev_method(sm, "INITIALIZE");
}
sm->selectedMethod = EAP_TYPE_NONE;
sm->methodState = METHOD_NONE;
sm->allowNotifications = TRUE;
sm->decision = DECISION_FAIL;
eapol_set_int(sm, EAPOL_idleWhile, sm->ClientTimeout);
eapol_set_bool(sm, EAPOL_eapSuccess, FALSE);
eapol_set_bool(sm, EAPOL_eapFail, FALSE);
os_free(sm->eapKeyData);
sm->eapKeyData = NULL;
sm->eapKeyAvailable = FALSE;
eapol_set_bool(sm, EAPOL_eapRestart, FALSE);
sm->lastId = -1; /* new session - make sure this does not match with
* the first EAP-Packet */
/*
* RFC 4137 does not reset eapResp and eapNoResp here. However, this
* seemed to be able to trigger cases where both were set and if EAPOL
* state machine uses eapNoResp first, it may end up not sending a real
* reply correctly. This occurred when the workaround in FAIL state set
* eapNoResp = TRUE.. Maybe that workaround needs to be fixed to do
* something else(?)
*/
eapol_set_bool(sm, EAPOL_eapResp, FALSE);
eapol_set_bool(sm, EAPOL_eapNoResp, FALSE);
sm->num_rounds = 0;
}
/*
* This state is reached whenever service from the lower layer is interrupted
* or unavailable (portEnabled == FALSE). Immediate transition to INITIALIZE
* occurs when the port becomes enabled.
*/
SM_STATE(EAP, DISABLED)
{
SM_ENTRY(EAP, DISABLED);
sm->num_rounds = 0;
}
/*
* The state machine spends most of its time here, waiting for something to
* happen. This state is entered unconditionally from INITIALIZE, DISCARD, and
* SEND_RESPONSE states.
*/
SM_STATE(EAP, IDLE)
{
SM_ENTRY(EAP, IDLE);
}
/*
* This state is entered when an EAP packet is received (eapReq == TRUE) to
* parse the packet header.
*/
SM_STATE(EAP, RECEIVED)
{
const u8 *eapReqData;
size_t eapReqDataLen;
SM_ENTRY(EAP, RECEIVED);
eapReqData = eapol_get_eapReqData(sm, &eapReqDataLen);
/* parse rxReq, rxSuccess, rxFailure, reqId, reqMethod */
eap_sm_parseEapReq(sm, eapReqData, eapReqDataLen);
sm->num_rounds++;
}
/*
* This state is entered when a request for a new type comes in. Either the
* correct method is started, or a Nak response is built.
*/
SM_STATE(EAP, GET_METHOD)
{
int reinit;
EapType method;
SM_ENTRY(EAP, GET_METHOD);
if (sm->reqMethod == EAP_TYPE_EXPANDED)
method = sm->reqVendorMethod;
else
method = sm->reqMethod;
if (!eap_sm_allowMethod(sm, sm->reqVendor, method)) {
wpa_printf(MSG_DEBUG, "EAP: vendor %u method %u not allowed",
sm->reqVendor, method);
goto nak;
}
/*
* RFC 4137 does not define specific operation for fast
* re-authentication (session resumption). The design here is to allow
* the previously used method data to be maintained for
* re-authentication if the method support session resumption.
* Otherwise, the previously used method data is freed and a new method
* is allocated here.
*/
if (sm->fast_reauth &&
sm->m && sm->m->vendor == sm->reqVendor &&
sm->m->method == method &&
sm->m->has_reauth_data &&
sm->m->has_reauth_data(sm, sm->eap_method_priv)) {
wpa_printf(MSG_DEBUG, "EAP: Using previous method data"
" for fast re-authentication");
reinit = 1;
} else {
eap_deinit_prev_method(sm, "GET_METHOD");
reinit = 0;
}
sm->selectedMethod = sm->reqMethod;
if (sm->m == NULL)
sm->m = eap_sm_get_eap_methods(sm->reqVendor, method);
if (!sm->m) {
wpa_printf(MSG_DEBUG, "EAP: Could not find selected method: "
"vendor %d method %d",
sm->reqVendor, method);
goto nak;
}
wpa_printf(MSG_DEBUG, "EAP: Initialize selected EAP method: "
"vendor %u method %u (%s)",
sm->reqVendor, method, sm->m->name);
if (reinit)
sm->eap_method_priv = sm->m->init_for_reauth(
sm, sm->eap_method_priv);
else
sm->eap_method_priv = sm->m->init(sm);
if (sm->eap_method_priv == NULL) {
struct wpa_ssid *config = eap_get_config(sm);
wpa_msg(sm->msg_ctx, MSG_INFO,
"EAP: Failed to initialize EAP method: vendor %u "
"method %u (%s)",
sm->reqVendor, method, sm->m->name);
sm->m = NULL;
sm->methodState = METHOD_NONE;
sm->selectedMethod = EAP_TYPE_NONE;
if (sm->reqMethod == EAP_TYPE_TLS && config &&
(config->pending_req_pin ||
config->pending_req_passphrase)) {
/*
* Return without generating Nak in order to allow
* entering of PIN code or passphrase to retry the
* current EAP packet.
*/
wpa_printf(MSG_DEBUG, "EAP: Pending PIN/passphrase "
"request - skip Nak");
return;
}
goto nak;
}
sm->methodState = METHOD_INIT;
wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_METHOD
"EAP vendor %u method %u (%s) selected",
sm->reqVendor, method, sm->m->name);
return;
nak:
os_free(sm->eapRespData);
sm->eapRespData = NULL;
sm->eapRespData = eap_sm_buildNak(sm, sm->reqId, &sm->eapRespDataLen);
}
/*
* The method processing happens here. The request from the authenticator is
* processed, and an appropriate response packet is built.
*/
SM_STATE(EAP, METHOD)
{
u8 *eapReqData;
size_t eapReqDataLen;
struct eap_method_ret ret;
SM_ENTRY(EAP, METHOD);
if (sm->m == NULL) {
wpa_printf(MSG_WARNING, "EAP::METHOD - method not selected");
return;
}
eapReqData = eapol_get_eapReqData(sm, &eapReqDataLen);
/*
* Get ignore, methodState, decision, allowNotifications, and
* eapRespData. RFC 4137 uses three separate method procedure (check,
* process, and buildResp) in this state. These have been combined into
* a single function call to m->process() in order to optimize EAP
* method implementation interface a bit. These procedures are only
* used from within this METHOD state, so there is no need to keep
* these as separate C functions.
*
* The RFC 4137 procedures return values as follows:
* ignore = m.check(eapReqData)
* (methodState, decision, allowNotifications) = m.process(eapReqData)
* eapRespData = m.buildResp(reqId)
*/
os_memset(&ret, 0, sizeof(ret));
ret.ignore = sm->ignore;
ret.methodState = sm->methodState;
ret.decision = sm->decision;
ret.allowNotifications = sm->allowNotifications;
os_free(sm->eapRespData);
sm->eapRespData = NULL;
sm->eapRespData = sm->m->process(sm, sm->eap_method_priv, &ret,
eapReqData, eapReqDataLen,
&sm->eapRespDataLen);
wpa_printf(MSG_DEBUG, "EAP: method process -> ignore=%s "
"methodState=%s decision=%s",
ret.ignore ? "TRUE" : "FALSE",
eap_sm_method_state_txt(ret.methodState),
eap_sm_decision_txt(ret.decision));
sm->ignore = ret.ignore;
if (sm->ignore)
return;
sm->methodState = ret.methodState;
sm->decision = ret.decision;
sm->allowNotifications = ret.allowNotifications;
if (sm->m->isKeyAvailable && sm->m->getKey &&
sm->m->isKeyAvailable(sm, sm->eap_method_priv)) {
os_free(sm->eapKeyData);
sm->eapKeyData = sm->m->getKey(sm, sm->eap_method_priv,
&sm->eapKeyDataLen);
}
}
/*
* This state signals the lower layer that a response packet is ready to be
* sent.
*/
SM_STATE(EAP, SEND_RESPONSE)
{
SM_ENTRY(EAP, SEND_RESPONSE);
os_free(sm->lastRespData);
if (sm->eapRespData) {
if (sm->workaround)
os_memcpy(sm->last_md5, sm->req_md5, 16);
sm->lastId = sm->reqId;
sm->lastRespData = os_malloc(sm->eapRespDataLen);
if (sm->lastRespData) {
os_memcpy(sm->lastRespData, sm->eapRespData,
sm->eapRespDataLen);
sm->lastRespDataLen = sm->eapRespDataLen;
}
eapol_set_bool(sm, EAPOL_eapResp, TRUE);
} else
sm->lastRespData = NULL;
eapol_set_bool(sm, EAPOL_eapReq, FALSE);
eapol_set_int(sm, EAPOL_idleWhile, sm->ClientTimeout);
}
/*
* This state signals the lower layer that the request was discarded, and no
* response packet will be sent at this time.
*/
SM_STATE(EAP, DISCARD)
{
SM_ENTRY(EAP, DISCARD);
eapol_set_bool(sm, EAPOL_eapReq, FALSE);
eapol_set_bool(sm, EAPOL_eapNoResp, TRUE);
}
/*
* Handles requests for Identity method and builds a response.
*/
SM_STATE(EAP, IDENTITY)
{
const u8 *eapReqData;
size_t eapReqDataLen;
SM_ENTRY(EAP, IDENTITY);
eapReqData = eapol_get_eapReqData(sm, &eapReqDataLen);
eap_sm_processIdentity(sm, eapReqData);
os_free(sm->eapRespData);
sm->eapRespData = NULL;
sm->eapRespData = eap_sm_buildIdentity(sm, sm->reqId,
&sm->eapRespDataLen, 0);
}
/*
* Handles requests for Notification method and builds a response.
*/
SM_STATE(EAP, NOTIFICATION)
{
const u8 *eapReqData;
size_t eapReqDataLen;
SM_ENTRY(EAP, NOTIFICATION);
eapReqData = eapol_get_eapReqData(sm, &eapReqDataLen);
eap_sm_processNotify(sm, eapReqData);
os_free(sm->eapRespData);
sm->eapRespData = NULL;
sm->eapRespData = eap_sm_buildNotify(sm->reqId, &sm->eapRespDataLen);
}
/*
* This state retransmits the previous response packet.
*/
SM_STATE(EAP, RETRANSMIT)
{
SM_ENTRY(EAP, RETRANSMIT);
os_free(sm->eapRespData);
if (sm->lastRespData) {
sm->eapRespData = os_malloc(sm->lastRespDataLen);
if (sm->eapRespData) {
os_memcpy(sm->eapRespData, sm->lastRespData,
sm->lastRespDataLen);
sm->eapRespDataLen = sm->lastRespDataLen;
}
} else
sm->eapRespData = NULL;
}
/*
* This state is entered in case of a successful completion of authentication
* and state machine waits here until port is disabled or EAP authentication is
* restarted.
*/
SM_STATE(EAP, SUCCESS)
{
SM_ENTRY(EAP, SUCCESS);
if (sm->eapKeyData != NULL)
sm->eapKeyAvailable = TRUE;
eapol_set_bool(sm, EAPOL_eapSuccess, TRUE);
/*
* RFC 4137 does not clear eapReq here, but this seems to be required
* to avoid processing the same request twice when state machine is
* initialized.
*/
eapol_set_bool(sm, EAPOL_eapReq, FALSE);
/*
* RFC 4137 does not set eapNoResp here, but this seems to be required
* to get EAPOL Supplicant backend state machine into SUCCESS state. In
* addition, either eapResp or eapNoResp is required to be set after
* processing the received EAP frame.
*/
eapol_set_bool(sm, EAPOL_eapNoResp, TRUE);
wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_SUCCESS
"EAP authentication completed successfully");
}
/*
* This state is entered in case of a failure and state machine waits here
* until port is disabled or EAP authentication is restarted.
*/
SM_STATE(EAP, FAILURE)
{
SM_ENTRY(EAP, FAILURE);
eapol_set_bool(sm, EAPOL_eapFail, TRUE);
/*
* RFC 4137 does not clear eapReq here, but this seems to be required
* to avoid processing the same request twice when state machine is
* initialized.
*/
eapol_set_bool(sm, EAPOL_eapReq, FALSE);
/*
* RFC 4137 does not set eapNoResp here. However, either eapResp or
* eapNoResp is required to be set after processing the received EAP
* frame.
*/
eapol_set_bool(sm, EAPOL_eapNoResp, TRUE);
wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_FAILURE
"EAP authentication failed");
}
static int eap_success_workaround(struct eap_sm *sm, int reqId, int lastId)
{
/*
* At least Microsoft IAS and Meetinghouse Aegis seem to be sending
* EAP-Success/Failure with lastId + 1 even though RFC 3748 and
* RFC 4137 require that reqId == lastId. In addition, it looks like
* Ringmaster v2.1.2.0 would be using lastId + 2 in EAP-Success.
*
* Accept this kind of Id if EAP workarounds are enabled. These are
* unauthenticated plaintext messages, so this should have minimal
* security implications (bit easier to fake EAP-Success/Failure).
*/
if (sm->workaround && (reqId == ((lastId + 1) & 0xff) ||
reqId == ((lastId + 2) & 0xff))) {
wpa_printf(MSG_DEBUG, "EAP: Workaround for unexpected "
"identifier field in EAP Success: "
"reqId=%d lastId=%d (these are supposed to be "
"same)", reqId, lastId);
return 1;
}
wpa_printf(MSG_DEBUG, "EAP: EAP-Success Id mismatch - reqId=%d "
"lastId=%d", reqId, lastId);
return 0;
}
/*
* RFC 4137 - Appendix A.1: EAP Peer State Machine - State transitions
*/
SM_STEP(EAP)
{
int duplicate;
if (eapol_get_bool(sm, EAPOL_eapRestart) &&
eapol_get_bool(sm, EAPOL_portEnabled))
SM_ENTER_GLOBAL(EAP, INITIALIZE);
else if (!eapol_get_bool(sm, EAPOL_portEnabled) || sm->force_disabled)
SM_ENTER_GLOBAL(EAP, DISABLED);
else if (sm->num_rounds > EAP_MAX_AUTH_ROUNDS) {
/* RFC 4137 does not place any limit on number of EAP messages
* in an authentication session. However, some error cases have
* ended up in a state were EAP messages were sent between the
* peer and server in a loop (e.g., TLS ACK frame in both
* direction). Since this is quite undesired outcome, limit the
* total number of EAP round-trips and abort authentication if
* this limit is exceeded.
*/
if (sm->num_rounds == EAP_MAX_AUTH_ROUNDS + 1) {
wpa_msg(sm->msg_ctx, MSG_INFO, "EAP: more than %d "
"authentication rounds - abort",
EAP_MAX_AUTH_ROUNDS);
sm->num_rounds++;
SM_ENTER_GLOBAL(EAP, FAILURE);
}
} else switch (sm->EAP_state) {
case EAP_INITIALIZE:
SM_ENTER(EAP, IDLE);
break;
case EAP_DISABLED:
if (eapol_get_bool(sm, EAPOL_portEnabled) &&
!sm->force_disabled)
SM_ENTER(EAP, INITIALIZE);
break;
case EAP_IDLE:
/*
* The first three transitions are from RFC 4137. The last two
* are local additions to handle special cases with LEAP and
* PEAP server not sending EAP-Success in some cases.
*/
if (eapol_get_bool(sm, EAPOL_eapReq))
SM_ENTER(EAP, RECEIVED);
else if ((eapol_get_bool(sm, EAPOL_altAccept) &&
sm->decision != DECISION_FAIL) ||
(eapol_get_int(sm, EAPOL_idleWhile) == 0 &&
sm->decision == DECISION_UNCOND_SUCC))
SM_ENTER(EAP, SUCCESS);
else if (eapol_get_bool(sm, EAPOL_altReject) ||
(eapol_get_int(sm, EAPOL_idleWhile) == 0 &&
sm->decision != DECISION_UNCOND_SUCC) ||
(eapol_get_bool(sm, EAPOL_altAccept) &&
sm->methodState != METHOD_CONT &&
sm->decision == DECISION_FAIL))
SM_ENTER(EAP, FAILURE);
else if (sm->selectedMethod == EAP_TYPE_LEAP &&
sm->leap_done && sm->decision != DECISION_FAIL &&
sm->methodState == METHOD_DONE)
SM_ENTER(EAP, SUCCESS);
else if (sm->selectedMethod == EAP_TYPE_PEAP &&
sm->peap_done && sm->decision != DECISION_FAIL &&
sm->methodState == METHOD_DONE)
SM_ENTER(EAP, SUCCESS);
break;
case EAP_RECEIVED:
duplicate = (sm->reqId == sm->lastId) && sm->rxReq;
if (sm->workaround && duplicate &&
os_memcmp(sm->req_md5, sm->last_md5, 16) != 0) {
/*
* RFC 4137 uses (reqId == lastId) as the only
* verification for duplicate EAP requests. However,
* this misses cases where the AS is incorrectly using
* the same id again; and unfortunately, such
* implementations exist. Use MD5 hash as an extra
* verification for the packets being duplicate to
* workaround these issues.
*/
wpa_printf(MSG_DEBUG, "EAP: AS used the same Id again,"
" but EAP packets were not identical");
wpa_printf(MSG_DEBUG, "EAP: workaround - assume this "
"is not a duplicate packet");
duplicate = 0;
}
/*
* Two special cases below for LEAP are local additions to work
* around odd LEAP behavior (EAP-Success in the middle of
* authentication and then swapped roles). Other transitions
* are based on RFC 4137.
*/
if (sm->rxSuccess && sm->decision != DECISION_FAIL &&
(sm->reqId == sm->lastId ||
eap_success_workaround(sm, sm->reqId, sm->lastId)))
SM_ENTER(EAP, SUCCESS);
else if (sm->methodState != METHOD_CONT &&
((sm->rxFailure &&
sm->decision != DECISION_UNCOND_SUCC) ||
(sm->rxSuccess && sm->decision == DECISION_FAIL &&
(sm->selectedMethod != EAP_TYPE_LEAP ||
sm->methodState != METHOD_MAY_CONT))) &&
(sm->reqId == sm->lastId ||
eap_success_workaround(sm, sm->reqId, sm->lastId)))
SM_ENTER(EAP, FAILURE);
else if (sm->rxReq && duplicate)
SM_ENTER(EAP, RETRANSMIT);
else if (sm->rxReq && !duplicate &&
sm->reqMethod == EAP_TYPE_NOTIFICATION &&
sm->allowNotifications)
SM_ENTER(EAP, NOTIFICATION);
else if (sm->rxReq && !duplicate &&
sm->selectedMethod == EAP_TYPE_NONE &&
sm->reqMethod == EAP_TYPE_IDENTITY)
SM_ENTER(EAP, IDENTITY);
else if (sm->rxReq && !duplicate &&
sm->selectedMethod == EAP_TYPE_NONE &&
sm->reqMethod != EAP_TYPE_IDENTITY &&
sm->reqMethod != EAP_TYPE_NOTIFICATION)
SM_ENTER(EAP, GET_METHOD);
else if (sm->rxReq && !duplicate &&
sm->reqMethod == sm->selectedMethod &&
sm->methodState != METHOD_DONE)
SM_ENTER(EAP, METHOD);
else if (sm->selectedMethod == EAP_TYPE_LEAP &&
(sm->rxSuccess || sm->rxResp))
SM_ENTER(EAP, METHOD);
else
SM_ENTER(EAP, DISCARD);
break;
case EAP_GET_METHOD:
if (sm->selectedMethod == sm->reqMethod)
SM_ENTER(EAP, METHOD);
else
SM_ENTER(EAP, SEND_RESPONSE);
break;
case EAP_METHOD:
if (sm->ignore)
SM_ENTER(EAP, DISCARD);
else
SM_ENTER(EAP, SEND_RESPONSE);
break;
case EAP_SEND_RESPONSE:
SM_ENTER(EAP, IDLE);
break;
case EAP_DISCARD:
SM_ENTER(EAP, IDLE);
break;
case EAP_IDENTITY:
SM_ENTER(EAP, SEND_RESPONSE);
break;
case EAP_NOTIFICATION:
SM_ENTER(EAP, SEND_RESPONSE);
break;
case EAP_RETRANSMIT:
SM_ENTER(EAP, SEND_RESPONSE);
break;
case EAP_SUCCESS:
break;
case EAP_FAILURE:
break;
}
}
static Boolean eap_sm_allowMethod(struct eap_sm *sm, int vendor,
EapType method)
{
struct wpa_ssid *config = eap_get_config(sm);
if (!wpa_config_allowed_eap_method(config, vendor, method)) {
wpa_printf(MSG_DEBUG, "EAP: configuration does not allow: "
"vendor %u method %u", vendor, method);
return FALSE;
}
if (eap_sm_get_eap_methods(vendor, method))
return TRUE;
wpa_printf(MSG_DEBUG, "EAP: not included in build: "
"vendor %u method %u", vendor, method);
return FALSE;
}
static u8 * eap_sm_build_expanded_nak(struct eap_sm *sm, int id, size_t *len,
const struct eap_method *methods,
size_t count)
{
struct wpa_ssid *config = eap_get_config(sm);
struct eap_hdr *resp;
u8 *pos;
int found = 0;
const struct eap_method *m;
wpa_printf(MSG_DEBUG, "EAP: Building expanded EAP-Nak");
/* RFC 3748 - 5.3.2: Expanded Nak */
*len = sizeof(struct eap_hdr) + 8;
resp = os_malloc(*len + 8 * (count + 1));
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_EXPANDED;
WPA_PUT_BE24(pos, EAP_VENDOR_IETF);
pos += 3;
WPA_PUT_BE32(pos, EAP_TYPE_NAK);
pos += 4;
for (m = methods; m; m = m->next) {
if (sm->reqVendor == m->vendor &&
sm->reqVendorMethod == m->method)
continue; /* do not allow the current method again */
if (wpa_config_allowed_eap_method(config, m->vendor,
m->method)) {
wpa_printf(MSG_DEBUG, "EAP: allowed type: "
"vendor=%u method=%u",
m->vendor, m->method);
*pos++ = EAP_TYPE_EXPANDED;
WPA_PUT_BE24(pos, m->vendor);
pos += 3;
WPA_PUT_BE32(pos, m->method);
pos += 4;
(*len) += 8;
found++;
}
}
if (!found) {
wpa_printf(MSG_DEBUG, "EAP: no more allowed methods");
*pos++ = EAP_TYPE_EXPANDED;
WPA_PUT_BE24(pos, EAP_VENDOR_IETF);
pos += 3;
WPA_PUT_BE32(pos, EAP_TYPE_NONE);
pos += 4;
(*len) += 8;
}
resp->length = host_to_be16(*len);
return (u8 *) resp;
}
static u8 * eap_sm_buildNak(struct eap_sm *sm, int id, size_t *len)
{
struct wpa_ssid *config = eap_get_config(sm);
struct eap_hdr *resp;
u8 *pos;
int found = 0, expanded_found = 0;
size_t count;
const struct eap_method *methods, *m;
wpa_printf(MSG_DEBUG, "EAP: Building EAP-Nak (requested type %u "
"vendor=%u method=%u not allowed)", sm->reqMethod,
sm->reqVendor, sm->reqVendorMethod);
methods = eap_peer_get_methods(&count);
if (methods == NULL)
return NULL;
if (sm->reqMethod == EAP_TYPE_EXPANDED)
return eap_sm_build_expanded_nak(sm, id, len, methods, count);
/* RFC 3748 - 5.3.1: Legacy Nak */
*len = sizeof(struct eap_hdr) + 1;
resp = os_malloc(*len + count + 1);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_NAK;
for (m = methods; m; m = m->next) {
if (m->vendor == EAP_VENDOR_IETF && m->method == sm->reqMethod)
continue; /* do not allow the current method again */
if (wpa_config_allowed_eap_method(config, m->vendor,
m->method)) {
if (m->vendor != EAP_VENDOR_IETF) {
if (expanded_found)
continue;
expanded_found = 1;
*pos++ = EAP_TYPE_EXPANDED;
} else
*pos++ = m->method;
(*len)++;
found++;
}
}
if (!found) {
*pos = EAP_TYPE_NONE;
(*len)++;
}
wpa_hexdump(MSG_DEBUG, "EAP: allowed methods",
((u8 *) (resp + 1)) + 1, found);
resp->length = host_to_be16(*len);
return (u8 *) resp;
}
static void eap_sm_processIdentity(struct eap_sm *sm, const u8 *req)
{
const struct eap_hdr *hdr = (const struct eap_hdr *) req;
const u8 *pos = (const u8 *) (hdr + 1);
pos++;
wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_STARTED
"EAP authentication started");
/*
* RFC 3748 - 5.1: Identity
* Data field may contain a displayable message in UTF-8. If this
* includes NUL-character, only the data before that should be
* displayed. Some EAP implementasitons may piggy-back additional
* options after the NUL.
*/
/* TODO: could save displayable message so that it can be shown to the
* user in case of interaction is required */
wpa_hexdump_ascii(MSG_DEBUG, "EAP: EAP-Request Identity data",
pos, be_to_host16(hdr->length) - 5);
}
#ifdef PCSC_FUNCS
static int eap_sm_imsi_identity(struct eap_sm *sm, struct wpa_ssid *ssid)
{
int aka = 0;
char imsi[100];
size_t imsi_len;
struct eap_method_type *m = ssid->eap_methods;
int i;
imsi_len = sizeof(imsi);
if (scard_get_imsi(sm->scard_ctx, imsi, &imsi_len)) {
wpa_printf(MSG_WARNING, "Failed to get IMSI from SIM");
return -1;
}
wpa_hexdump_ascii(MSG_DEBUG, "IMSI", (u8 *) imsi, imsi_len);
for (i = 0; m && (m[i].vendor != EAP_VENDOR_IETF ||
m[i].method != EAP_TYPE_NONE); i++) {
if (m[i].vendor == EAP_VENDOR_IETF &&
m[i].method == EAP_TYPE_AKA) {
aka = 1;
break;
}
}
os_free(ssid->identity);
ssid->identity = os_malloc(1 + imsi_len);
if (ssid->identity == NULL) {
wpa_printf(MSG_WARNING, "Failed to allocate buffer for "
"IMSI-based identity");
return -1;
}
ssid->identity[0] = aka ? '0' : '1';
os_memcpy(ssid->identity + 1, imsi, imsi_len);
ssid->identity_len = 1 + imsi_len;
return 0;
}
#endif /* PCSC_FUNCS */
static int eap_sm_get_scard_identity(struct eap_sm *sm, struct wpa_ssid *ssid)
{
#ifdef PCSC_FUNCS
if (scard_set_pin(sm->scard_ctx, ssid->pin)) {
/*
* Make sure the same PIN is not tried again in order to avoid
* blocking SIM.
*/
os_free(ssid->pin);
ssid->pin = NULL;
wpa_printf(MSG_WARNING, "PIN validation failed");
eap_sm_request_pin(sm);
return -1;
}
return eap_sm_imsi_identity(sm, ssid);
#else /* PCSC_FUNCS */
return -1;
#endif /* PCSC_FUNCS */
}
/**
* eap_sm_buildIdentity - Build EAP-Identity/Response for the current network
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @id: EAP identifier for the packet
* @len: Pointer to a variable that will be set to the length of the response
* @encrypted: Whether the packet is for encrypted tunnel (EAP phase 2)
* Returns: Pointer to the allocated EAP-Identity/Response packet or %NULL on
* failure
*
* This function allocates and builds an EAP-Identity/Response packet for the
* current network. The caller is responsible for freeing the returned data.
*/
u8 * eap_sm_buildIdentity(struct eap_sm *sm, int id, size_t *len,
int encrypted)
{
struct wpa_ssid *config = eap_get_config(sm);
struct eap_hdr *resp;
u8 *pos;
const u8 *identity;
size_t identity_len;
if (config == NULL) {
wpa_printf(MSG_WARNING, "EAP: buildIdentity: configuration "
"was not available");
return NULL;
}
if (sm->m && sm->m->get_identity &&
(identity = sm->m->get_identity(sm, sm->eap_method_priv,
&identity_len)) != NULL) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP: using method re-auth "
"identity", identity, identity_len);
} else if (!encrypted && config->anonymous_identity) {
identity = config->anonymous_identity;
identity_len = config->anonymous_identity_len;
wpa_hexdump_ascii(MSG_DEBUG, "EAP: using anonymous identity",
identity, identity_len);
} else {
identity = config->identity;
identity_len = config->identity_len;
wpa_hexdump_ascii(MSG_DEBUG, "EAP: using real identity",
identity, identity_len);
}
if (identity == NULL) {
wpa_printf(MSG_WARNING, "EAP: buildIdentity: identity "
"configuration was not available");
if (config->pcsc) {
if (eap_sm_get_scard_identity(sm, config) < 0)
return NULL;
identity = config->identity;
identity_len = config->identity_len;
wpa_hexdump_ascii(MSG_DEBUG, "permanent identity from "
"IMSI", identity, identity_len);
} else {
eap_sm_request_identity(sm);
return NULL;
}
}
*len = sizeof(struct eap_hdr) + 1 + identity_len;
resp = os_malloc(*len);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
resp->length = host_to_be16(*len);
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_IDENTITY;
os_memcpy(pos, identity, identity_len);
return (u8 *) resp;
}
static void eap_sm_processNotify(struct eap_sm *sm, const u8 *req)
{
const struct eap_hdr *hdr = (const struct eap_hdr *) req;
const u8 *pos;
char *msg;
size_t i, msg_len;
pos = (const u8 *) (hdr + 1);
pos++;
msg_len = be_to_host16(hdr->length);
if (msg_len < 5)
return;
msg_len -= 5;
wpa_hexdump_ascii(MSG_DEBUG, "EAP: EAP-Request Notification data",
pos, msg_len);
msg = os_malloc(msg_len + 1);
if (msg == NULL)
return;
for (i = 0; i < msg_len; i++)
msg[i] = isprint(pos[i]) ? (char) pos[i] : '_';
msg[msg_len] = '\0';
wpa_msg(sm->msg_ctx, MSG_INFO, "%s%s",
WPA_EVENT_EAP_NOTIFICATION, msg);
os_free(msg);
}
static u8 * eap_sm_buildNotify(int id, size_t *len)
{
struct eap_hdr *resp;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP: Generating EAP-Response Notification");
*len = sizeof(struct eap_hdr) + 1;
resp = os_malloc(*len);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
resp->length = host_to_be16(*len);
pos = (u8 *) (resp + 1);
*pos = EAP_TYPE_NOTIFICATION;
return (u8 *) resp;
}
static void eap_sm_parseEapReq(struct eap_sm *sm, const u8 *req, size_t len)
{
const struct eap_hdr *hdr;
size_t plen;
const u8 *pos;
sm->rxReq = sm->rxResp = sm->rxSuccess = sm->rxFailure = FALSE;
sm->reqId = 0;
sm->reqMethod = EAP_TYPE_NONE;
sm->reqVendor = EAP_VENDOR_IETF;
sm->reqVendorMethod = EAP_TYPE_NONE;
if (req == NULL || len < sizeof(*hdr))
return;
hdr = (const struct eap_hdr *) req;
plen = be_to_host16(hdr->length);
if (plen > len) {
wpa_printf(MSG_DEBUG, "EAP: Ignored truncated EAP-Packet "
"(len=%lu plen=%lu)",
(unsigned long) len, (unsigned long) plen);
return;
}
sm->reqId = hdr->identifier;
if (sm->workaround) {
md5_vector(1, (const u8 **) &req, &plen, sm->req_md5);
}
switch (hdr->code) {
case EAP_CODE_REQUEST:
if (plen < sizeof(*hdr) + 1) {
wpa_printf(MSG_DEBUG, "EAP: Too short EAP-Request - "
"no Type field");
return;
}
sm->rxReq = TRUE;
pos = (const u8 *) (hdr + 1);
sm->reqMethod = *pos++;
if (sm->reqMethod == EAP_TYPE_EXPANDED) {
if (plen < sizeof(*hdr) + 8) {
wpa_printf(MSG_DEBUG, "EAP: Ignored truncated "
"expanded EAP-Packet (plen=%lu)",
(unsigned long) plen);
return;
}
sm->reqVendor = WPA_GET_BE24(pos);
pos += 3;
sm->reqVendorMethod = WPA_GET_BE32(pos);
}
wpa_printf(MSG_DEBUG, "EAP: Received EAP-Request id=%d "
"method=%u vendor=%u vendorMethod=%u",
sm->reqId, sm->reqMethod, sm->reqVendor,
sm->reqVendorMethod);
break;
case EAP_CODE_RESPONSE:
if (sm->selectedMethod == EAP_TYPE_LEAP) {
/*
* LEAP differs from RFC 4137 by using reversed roles
* for mutual authentication and because of this, we
* need to accept EAP-Response frames if LEAP is used.
*/
if (plen < sizeof(*hdr) + 1) {
wpa_printf(MSG_DEBUG, "EAP: Too short "
"EAP-Response - no Type field");
return;
}
sm->rxResp = TRUE;
pos = (const u8 *) (hdr + 1);
sm->reqMethod = *pos;
wpa_printf(MSG_DEBUG, "EAP: Received EAP-Response for "
"LEAP method=%d id=%d",
sm->reqMethod, sm->reqId);
break;
}
wpa_printf(MSG_DEBUG, "EAP: Ignored EAP-Response");
break;
case EAP_CODE_SUCCESS:
wpa_printf(MSG_DEBUG, "EAP: Received EAP-Success");
sm->rxSuccess = TRUE;
break;
case EAP_CODE_FAILURE:
wpa_printf(MSG_DEBUG, "EAP: Received EAP-Failure");
sm->rxFailure = TRUE;
break;
default:
wpa_printf(MSG_DEBUG, "EAP: Ignored EAP-Packet with unknown "
"code %d", hdr->code);
break;
}
}
/**
* eap_sm_init - Allocate and initialize EAP state machine
* @eapol_ctx: Context data to be used with eapol_cb calls
* @eapol_cb: Pointer to EAPOL callback functions
* @msg_ctx: Context data for wpa_msg() calls
* @conf: EAP configuration
* Returns: Pointer to the allocated EAP state machine or %NULL on failure
*
* This function allocates and initializes an EAP state machine. In addition,
* this initializes TLS library for the new EAP state machine. eapol_cb pointer
* will be in use until eap_sm_deinit() is used to deinitialize this EAP state
* machine. Consequently, the caller must make sure that this data structure
* remains alive while the EAP state machine is active.
*/
struct eap_sm * eap_sm_init(void *eapol_ctx, struct eapol_callbacks *eapol_cb,
void *msg_ctx, struct eap_config *conf)
{
struct eap_sm *sm;
struct tls_config tlsconf;
sm = os_zalloc(sizeof(*sm));
if (sm == NULL)
return NULL;
sm->eapol_ctx = eapol_ctx;
sm->eapol_cb = eapol_cb;
sm->msg_ctx = msg_ctx;
sm->ClientTimeout = 60;
os_memset(&tlsconf, 0, sizeof(tlsconf));
tlsconf.opensc_engine_path = conf->opensc_engine_path;
tlsconf.pkcs11_engine_path = conf->pkcs11_engine_path;
tlsconf.pkcs11_module_path = conf->pkcs11_module_path;
sm->ssl_ctx = tls_init(&tlsconf);
if (sm->ssl_ctx == NULL) {
wpa_printf(MSG_WARNING, "SSL: Failed to initialize TLS "
"context.");
os_free(sm);
return NULL;
}
return sm;
}
/**
* eap_sm_deinit - Deinitialize and free an EAP state machine
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* This function deinitializes EAP state machine and frees all allocated
* resources.
*/
void eap_sm_deinit(struct eap_sm *sm)
{
if (sm == NULL)
return;
eap_deinit_prev_method(sm, "EAP deinit");
eap_sm_abort(sm);
tls_deinit(sm->ssl_ctx);
os_free(sm);
}
/**
* eap_sm_step - Step EAP state machine
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* Returns: 1 if EAP state was changed or 0 if not
*
* This function advances EAP state machine to a new state to match with the
* current variables. This should be called whenever variables used by the EAP
* state machine have changed.
*/
int eap_sm_step(struct eap_sm *sm)
{
int res = 0;
do {
sm->changed = FALSE;
SM_STEP_RUN(EAP);
if (sm->changed)
res = 1;
} while (sm->changed);
return res;
}
/**
* eap_sm_abort - Abort EAP authentication
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* Release system resources that have been allocated for the authentication
* session without fully deinitializing the EAP state machine.
*/
void eap_sm_abort(struct eap_sm *sm)
{
os_free(sm->lastRespData);
sm->lastRespData = NULL;
os_free(sm->eapRespData);
sm->eapRespData = NULL;
os_free(sm->eapKeyData);
sm->eapKeyData = NULL;
/* This is not clearly specified in the EAP statemachines draft, but
* it seems necessary to make sure that some of the EAPOL variables get
* cleared for the next authentication. */
eapol_set_bool(sm, EAPOL_eapSuccess, FALSE);
}
#ifdef CONFIG_CTRL_IFACE
static const char * eap_sm_state_txt(int state)
{
switch (state) {
case EAP_INITIALIZE:
return "INITIALIZE";
case EAP_DISABLED:
return "DISABLED";
case EAP_IDLE:
return "IDLE";
case EAP_RECEIVED:
return "RECEIVED";
case EAP_GET_METHOD:
return "GET_METHOD";
case EAP_METHOD:
return "METHOD";
case EAP_SEND_RESPONSE:
return "SEND_RESPONSE";
case EAP_DISCARD:
return "DISCARD";
case EAP_IDENTITY:
return "IDENTITY";
case EAP_NOTIFICATION:
return "NOTIFICATION";
case EAP_RETRANSMIT:
return "RETRANSMIT";
case EAP_SUCCESS:
return "SUCCESS";
case EAP_FAILURE:
return "FAILURE";
default:
return "UNKNOWN";
}
}
#endif /* CONFIG_CTRL_IFACE */
#if defined(CONFIG_CTRL_IFACE) || !defined(CONFIG_NO_STDOUT_DEBUG)
static const char * eap_sm_method_state_txt(EapMethodState state)
{
switch (state) {
case METHOD_NONE:
return "NONE";
case METHOD_INIT:
return "INIT";
case METHOD_CONT:
return "CONT";
case METHOD_MAY_CONT:
return "MAY_CONT";
case METHOD_DONE:
return "DONE";
default:
return "UNKNOWN";
}
}
static const char * eap_sm_decision_txt(EapDecision decision)
{
switch (decision) {
case DECISION_FAIL:
return "FAIL";
case DECISION_COND_SUCC:
return "COND_SUCC";
case DECISION_UNCOND_SUCC:
return "UNCOND_SUCC";
default:
return "UNKNOWN";
}
}
#endif /* CONFIG_CTRL_IFACE || !CONFIG_NO_STDOUT_DEBUG */
#ifdef CONFIG_CTRL_IFACE
/**
* eap_sm_get_status - Get EAP state machine status
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @buf: Buffer for status information
* @buflen: Maximum buffer length
* @verbose: Whether to include verbose status information
* Returns: Number of bytes written to buf.
*
* Query EAP state machine for status information. This function fills in a
* text area with current status information from the EAPOL state machine. If
* the buffer (buf) is not large enough, status information will be truncated
* to fit the buffer.
*/
int eap_sm_get_status(struct eap_sm *sm, char *buf, size_t buflen, int verbose)
{
int len, ret;
if (sm == NULL)
return 0;
len = os_snprintf(buf, buflen,
"EAP state=%s\n",
eap_sm_state_txt(sm->EAP_state));
if (len < 0 || (size_t) len >= buflen)
return 0;
if (sm->selectedMethod != EAP_TYPE_NONE) {
const char *name;
if (sm->m) {
name = sm->m->name;
} else {
const struct eap_method *m =
eap_sm_get_eap_methods(EAP_VENDOR_IETF,
sm->selectedMethod);
if (m)
name = m->name;
else
name = "?";
}
ret = os_snprintf(buf + len, buflen - len,
"selectedMethod=%d (EAP-%s)\n",
sm->selectedMethod, name);
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
if (sm->m && sm->m->get_status) {
len += sm->m->get_status(sm, sm->eap_method_priv,
buf + len, buflen - len,
verbose);
}
}
if (verbose) {
ret = os_snprintf(buf + len, buflen - len,
"reqMethod=%d\n"
"methodState=%s\n"
"decision=%s\n"
"ClientTimeout=%d\n",
sm->reqMethod,
eap_sm_method_state_txt(sm->methodState),
eap_sm_decision_txt(sm->decision),
sm->ClientTimeout);
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
}
return len;
}
#endif /* CONFIG_CTRL_IFACE */
#if defined(CONFIG_CTRL_IFACE) || !defined(CONFIG_NO_STDOUT_DEBUG)
typedef enum {
TYPE_IDENTITY, TYPE_PASSWORD, TYPE_OTP, TYPE_PIN, TYPE_NEW_PASSWORD,
TYPE_PASSPHRASE
} eap_ctrl_req_type;
static void eap_sm_request(struct eap_sm *sm, eap_ctrl_req_type type,
const char *msg, size_t msglen)
{
struct wpa_ssid *config;
char *buf;
size_t buflen;
int len;
char *field;
char *txt, *tmp;
if (sm == NULL)
return;
config = eap_get_config(sm);
if (config == NULL)
return;
switch (type) {
case TYPE_IDENTITY:
field = "IDENTITY";
txt = "Identity";
config->pending_req_identity++;
break;
case TYPE_PASSWORD:
field = "PASSWORD";
txt = "Password";
config->pending_req_password++;
break;
case TYPE_NEW_PASSWORD:
field = "NEW_PASSWORD";
txt = "New Password";
config->pending_req_new_password++;
break;
case TYPE_PIN:
field = "PIN";
txt = "PIN";
config->pending_req_pin++;
break;
case TYPE_OTP:
field = "OTP";
if (msg) {
tmp = os_malloc(msglen + 3);
if (tmp == NULL)
return;
tmp[0] = '[';
os_memcpy(tmp + 1, msg, msglen);
tmp[msglen + 1] = ']';
tmp[msglen + 2] = '\0';
txt = tmp;
os_free(config->pending_req_otp);
config->pending_req_otp = tmp;
config->pending_req_otp_len = msglen + 3;
} else {
if (config->pending_req_otp == NULL)
return;
txt = config->pending_req_otp;
}
break;
case TYPE_PASSPHRASE:
field = "PASSPHRASE";
txt = "Private key passphrase";
config->pending_req_passphrase++;
break;
default:
return;
}
buflen = 100 + os_strlen(txt) + config->ssid_len;
buf = os_malloc(buflen);
if (buf == NULL)
return;
len = os_snprintf(buf, buflen,
WPA_CTRL_REQ "%s-%d:%s needed for SSID ",
field, config->id, txt);
if (len < 0 || (size_t) len >= buflen) {
os_free(buf);
return;
}
if (config->ssid && buflen > len + config->ssid_len) {
os_memcpy(buf + len, config->ssid, config->ssid_len);
len += config->ssid_len;
buf[len] = '\0';
}
buf[buflen - 1] = '\0';
wpa_msg(sm->msg_ctx, MSG_INFO, "%s", buf);
os_free(buf);
}
#else /* CONFIG_CTRL_IFACE || !CONFIG_NO_STDOUT_DEBUG */
#define eap_sm_request(sm, type, msg, msglen) do { } while (0)
#endif /* CONFIG_CTRL_IFACE || !CONFIG_NO_STDOUT_DEBUG */
/**
* eap_sm_request_identity - Request identity from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* EAP methods can call this function to request identity information for the
* current network. This is normally called when the identity is not included
* in the network configuration. The request will be sent to monitor programs
* through the control interface.
*/
void eap_sm_request_identity(struct eap_sm *sm)
{
eap_sm_request(sm, TYPE_IDENTITY, NULL, 0);
}
/**
* eap_sm_request_password - Request password from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* EAP methods can call this function to request password information for the
* current network. This is normally called when the password is not included
* in the network configuration. The request will be sent to monitor programs
* through the control interface.
*/
void eap_sm_request_password(struct eap_sm *sm)
{
eap_sm_request(sm, TYPE_PASSWORD, NULL, 0);
}
/**
* eap_sm_request_new_password - Request new password from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* EAP methods can call this function to request new password information for
* the current network. This is normally called when the EAP method indicates
* that the current password has expired and password change is required. The
* request will be sent to monitor programs through the control interface.
*/
void eap_sm_request_new_password(struct eap_sm *sm)
{
eap_sm_request(sm, TYPE_NEW_PASSWORD, NULL, 0);
}
/**
* eap_sm_request_pin - Request SIM or smart card PIN from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* EAP methods can call this function to request SIM or smart card PIN
* information for the current network. This is normally called when the PIN is
* not included in the network configuration. The request will be sent to
* monitor programs through the control interface.
*/
void eap_sm_request_pin(struct eap_sm *sm)
{
eap_sm_request(sm, TYPE_PIN, NULL, 0);
}
/**
* eap_sm_request_otp - Request one time password from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @msg: Message to be displayed to the user when asking for OTP
* @msg_len: Length of the user displayable message
*
* EAP methods can call this function to request open time password (OTP) for
* the current network. The request will be sent to monitor programs through
* the control interface.
*/
void eap_sm_request_otp(struct eap_sm *sm, const char *msg, size_t msg_len)
{
eap_sm_request(sm, TYPE_OTP, msg, msg_len);
}
/**
* eap_sm_request_passphrase - Request passphrase from user (ctrl_iface)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* EAP methods can call this function to request passphrase for a private key
* for the current network. This is normally called when the passphrase is not
* included in the network configuration. The request will be sent to monitor
* programs through the control interface.
*/
void eap_sm_request_passphrase(struct eap_sm *sm)
{
eap_sm_request(sm, TYPE_PASSPHRASE, NULL, 0);
}
/**
* eap_sm_notify_ctrl_attached - Notification of attached monitor
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* Notify EAP state machines that a monitor was attached to the control
* interface to trigger re-sending of pending requests for user input.
*/
void eap_sm_notify_ctrl_attached(struct eap_sm *sm)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return;
/* Re-send any pending requests for user data since a new control
* interface was added. This handles cases where the EAP authentication
* starts immediately after system startup when the user interface is
* not yet running. */
if (config->pending_req_identity)
eap_sm_request_identity(sm);
if (config->pending_req_password)
eap_sm_request_password(sm);
if (config->pending_req_new_password)
eap_sm_request_new_password(sm);
if (config->pending_req_otp)
eap_sm_request_otp(sm, NULL, 0);
if (config->pending_req_pin)
eap_sm_request_pin(sm);
if (config->pending_req_passphrase)
eap_sm_request_passphrase(sm);
}
static int eap_allowed_phase2_type(int vendor, int type)
{
if (vendor != EAP_VENDOR_IETF)
return 0;
return type != EAP_TYPE_PEAP && type != EAP_TYPE_TTLS &&
type != EAP_TYPE_FAST;
}
/**
* eap_get_phase2_type - Get EAP type for the given EAP phase 2 method name
* @name: EAP method name, e.g., MD5
* @vendor: Buffer for returning EAP Vendor-Id
* Returns: EAP method type or %EAP_TYPE_NONE if not found
*
* This function maps EAP type names into EAP type numbers that are allowed for
* Phase 2, i.e., for tunneled authentication. Phase 2 is used, e.g., with
* EAP-PEAP, EAP-TTLS, and EAP-FAST.
*/
u32 eap_get_phase2_type(const char *name, int *vendor)
{
int v;
u8 type = eap_get_type(name, &v);
if (eap_allowed_phase2_type(v, type)) {
*vendor = v;
return type;
}
*vendor = EAP_VENDOR_IETF;
return EAP_TYPE_NONE;
}
/**
* eap_get_phase2_types - Get list of allowed EAP phase 2 types
* @config: Pointer to a network configuration
* @count: Pointer to a variable to be filled with number of returned EAP types
* Returns: Pointer to allocated type list or %NULL on failure
*
* This function generates an array of allowed EAP phase 2 (tunneled) types for
* the given network configuration.
*/
struct eap_method_type * eap_get_phase2_types(struct wpa_ssid *config,
size_t *count)
{
struct eap_method_type *buf;
u32 method;
int vendor;
size_t mcount;
const struct eap_method *methods, *m;
methods = eap_peer_get_methods(&mcount);
if (methods == NULL)
return NULL;
*count = 0;
buf = os_malloc(mcount * sizeof(struct eap_method_type));
if (buf == NULL)
return NULL;
for (m = methods; m; m = m->next) {
vendor = m->vendor;
method = m->method;
if (eap_allowed_phase2_type(vendor, method)) {
if (vendor == EAP_VENDOR_IETF &&
method == EAP_TYPE_TLS && config &&
config->private_key2 == NULL)
continue;
buf[*count].vendor = vendor;
buf[*count].method = method;
(*count)++;
}
}
return buf;
}
/**
* eap_set_fast_reauth - Update fast_reauth setting
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @enabled: 1 = Fast reauthentication is enabled, 0 = Disabled
*/
void eap_set_fast_reauth(struct eap_sm *sm, int enabled)
{
sm->fast_reauth = enabled;
}
/**
* eap_set_workaround - Update EAP workarounds setting
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @workaround: 1 = Enable EAP workarounds, 0 = Disable EAP workarounds
*/
void eap_set_workaround(struct eap_sm *sm, unsigned int workaround)
{
sm->workaround = workaround;
}
/**
* eap_get_config - Get current network configuration
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* Returns: Pointer to the current network configuration or %NULL if not found
*
* EAP peer methods should avoid using this function if they can use other
* access functions, like eap_get_config_identity() and
* eap_get_config_password(), that do not require direct access to
* struct wpa_ssid.
*/
struct wpa_ssid * eap_get_config(struct eap_sm *sm)
{
return sm->eapol_cb->get_config(sm->eapol_ctx);
}
/**
* eap_get_config_password - Get identity from the network configuration
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Buffer for the length of the identity
* Returns: Pointer to the identity or %NULL if not found
*/
const u8 * eap_get_config_identity(struct eap_sm *sm, size_t *len)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return NULL;
*len = config->identity_len;
return config->identity;
}
/**
* eap_get_config_password - Get password from the network configuration
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Buffer for the length of the password
* Returns: Pointer to the password or %NULL if not found
*/
const u8 * eap_get_config_password(struct eap_sm *sm, size_t *len)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return NULL;
*len = config->password_len;
return config->password;
}
/**
* eap_get_config_new_password - Get new password from network configuration
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Buffer for the length of the new password
* Returns: Pointer to the new password or %NULL if not found
*/
const u8 * eap_get_config_new_password(struct eap_sm *sm, size_t *len)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return NULL;
*len = config->new_password_len;
return config->new_password;
}
/**
* eap_get_config_otp - Get one-time password from the network configuration
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Buffer for the length of the one-time password
* Returns: Pointer to the one-time password or %NULL if not found
*/
const u8 * eap_get_config_otp(struct eap_sm *sm, size_t *len)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return NULL;
*len = config->otp_len;
return config->otp;
}
/**
* eap_clear_config_otp - Clear used one-time password
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* This function clears a used one-time password (OTP) from the current network
* configuration. This should be called when the OTP has been used and is not
* needed anymore.
*/
void eap_clear_config_otp(struct eap_sm *sm)
{
struct wpa_ssid *config = eap_get_config(sm);
if (config == NULL)
return;
os_memset(config->otp, 0, config->otp_len);
os_free(config->otp);
config->otp = NULL;
config->otp_len = 0;
}
/**
* eap_key_available - Get key availability (eapKeyAvailable variable)
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* Returns: 1 if EAP keying material is available, 0 if not
*/
int eap_key_available(struct eap_sm *sm)
{
return sm ? sm->eapKeyAvailable : 0;
}
/**
* eap_notify_success - Notify EAP state machine about external success trigger
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* This function is called when external event, e.g., successful completion of
* WPA-PSK key handshake, is indicating that EAP state machine should move to
* success state. This is mainly used with security modes that do not use EAP
* state machine (e.g., WPA-PSK).
*/
void eap_notify_success(struct eap_sm *sm)
{
if (sm) {
sm->decision = DECISION_COND_SUCC;
sm->EAP_state = EAP_SUCCESS;
}
}
/**
* eap_notify_lower_layer_success - Notification of lower layer success
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* Notify EAP state machines that a lower layer has detected a successful
* authentication. This is used to recover from dropped EAP-Success messages.
*/
void eap_notify_lower_layer_success(struct eap_sm *sm)
{
if (sm == NULL)
return;
if (eapol_get_bool(sm, EAPOL_eapSuccess) ||
sm->decision == DECISION_FAIL ||
(sm->methodState != METHOD_MAY_CONT &&
sm->methodState != METHOD_DONE))
return;
if (sm->eapKeyData != NULL)
sm->eapKeyAvailable = TRUE;
eapol_set_bool(sm, EAPOL_eapSuccess, TRUE);
wpa_msg(sm->msg_ctx, MSG_INFO, WPA_EVENT_EAP_SUCCESS
"EAP authentication completed successfully (based on lower "
"layer success)");
}
/**
* eap_get_eapKeyData - Get master session key (MSK) from EAP state machine
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Pointer to variable that will be set to number of bytes in the key
* Returns: Pointer to the EAP keying data or %NULL on failure
*
* Fetch EAP keying material (MSK, eapKeyData) from the EAP state machine. The
* key is available only after a successful authentication. EAP state machine
* continues to manage the key data and the caller must not change or free the
* returned data.
*/
const u8 * eap_get_eapKeyData(struct eap_sm *sm, size_t *len)
{
if (sm == NULL || sm->eapKeyData == NULL) {
*len = 0;
return NULL;
}
*len = sm->eapKeyDataLen;
return sm->eapKeyData;
}
/**
* eap_get_eapKeyData - Get EAP response data
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @len: Pointer to variable that will be set to the length of the response
* Returns: Pointer to the EAP response (eapRespData) or %NULL on failure
*
* Fetch EAP response (eapRespData) from the EAP state machine. This data is
* available when EAP state machine has processed an incoming EAP request. The
* EAP state machine does not maintain a reference to the response after this
* function is called and the caller is responsible for freeing the data.
*/
u8 * eap_get_eapRespData(struct eap_sm *sm, size_t *len)
{
u8 *resp;
if (sm == NULL || sm->eapRespData == NULL) {
*len = 0;
return NULL;
}
resp = sm->eapRespData;
*len = sm->eapRespDataLen;
sm->eapRespData = NULL;
sm->eapRespDataLen = 0;
return resp;
}
/**
* eap_sm_register_scard_ctx - Notification of smart card context
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @ctx: Context data for smart card operations
*
* Notify EAP state machines of context data for smart card operations. This
* context data will be used as a parameter for scard_*() functions.
*/
void eap_register_scard_ctx(struct eap_sm *sm, void *ctx)
{
if (sm)
sm->scard_ctx = ctx;
}
/**
* eap_hdr_validate - Validate EAP header
* @vendor: Expected EAP Vendor-Id (0 = IETF)
* @eap_type: Expected EAP type number
* @msg: EAP frame (starting with EAP header)
* @msglen: Length of msg
* @plen: Pointer to variable to contain the returned payload length
* Returns: Pointer to EAP payload (after type field), or %NULL on failure
*
* This is a helper function for EAP method implementations. This is usually
* called in the beginning of struct eap_method::process() function to verify
* that the received EAP request packet has a valid header. This function is
* able to process both legacy and expanded EAP headers and in most cases, the
* caller can just use the returned payload pointer (into *plen) for processing
* the payload regardless of whether the packet used the expanded EAP header or
* not.
*/
const u8 * eap_hdr_validate(int vendor, EapType eap_type,
const u8 *msg, size_t msglen, size_t *plen)
{
const struct eap_hdr *hdr;
const u8 *pos;
size_t len;
hdr = (const struct eap_hdr *) msg;
if (msglen < sizeof(*hdr)) {
wpa_printf(MSG_INFO, "EAP: Too short EAP frame");
return NULL;
}
len = be_to_host16(hdr->length);
if (len < sizeof(*hdr) + 1 || len > msglen) {
wpa_printf(MSG_INFO, "EAP: Invalid EAP length");
return NULL;
}
pos = (const u8 *) (hdr + 1);
if (*pos == EAP_TYPE_EXPANDED) {
int exp_vendor;
u32 exp_type;
if (len < sizeof(*hdr) + 8) {
wpa_printf(MSG_INFO, "EAP: Invalid expanded EAP "
"length");
return NULL;
}
pos++;
exp_vendor = WPA_GET_BE24(pos);
pos += 3;
exp_type = WPA_GET_BE32(pos);
pos += 4;
if (exp_vendor != vendor || exp_type != (u32) eap_type) {
wpa_printf(MSG_INFO, "EAP: Invalid expanded frame "
"type");
return NULL;
}
*plen = len - sizeof(*hdr) - 8;
return pos;
} else {
if (vendor != EAP_VENDOR_IETF || *pos != eap_type) {
wpa_printf(MSG_INFO, "EAP: Invalid frame type");
return NULL;
}
*plen = len - sizeof(*hdr) - 1;
return pos + 1;
}
}
/**
* eap_set_config_blob - Set or add a named configuration blob
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @blob: New value for the blob
*
* Adds a new configuration blob or replaces the current value of an existing
* blob.
*/
void eap_set_config_blob(struct eap_sm *sm, struct wpa_config_blob *blob)
{
sm->eapol_cb->set_config_blob(sm->eapol_ctx, blob);
}
/**
* eap_get_config_blob - Get a named configuration blob
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @name: Name of the blob
* Returns: Pointer to blob data or %NULL if not found
*/
const struct wpa_config_blob * eap_get_config_blob(struct eap_sm *sm,
const char *name)
{
return sm->eapol_cb->get_config_blob(sm->eapol_ctx, name);
}
/**
* eap_set_force_disabled - Set force_disabled flag
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
* @disabled: 1 = EAP disabled, 0 = EAP enabled
*
* This function is used to force EAP state machine to be disabled when it is
* not in use (e.g., with WPA-PSK or plaintext connections).
*/
void eap_set_force_disabled(struct eap_sm *sm, int disabled)
{
sm->force_disabled = disabled;
}
/**
* eap_msg_alloc - Allocate a buffer for an EAP message
* @vendor: Vendor-Id (0 = IETF)
* @type: EAP type
* @len: Buffer for returning message length
* @payload_len: Payload length in bytes (data after Type)
* @code: Message Code (EAP_CODE_*)
* @identifier: Identifier
* @payload: Pointer to payload pointer that will be set to point to the
* beginning of the payload or %NULL if payload pointer is not needed
* Returns: Pointer to the allocated message buffer or %NULL on error
*
* This function can be used to allocate a buffer for an EAP message and fill
* in the EAP header. This function is automatically using expanded EAP header
* if the selected Vendor-Id is not IETF. In other words, most EAP methods do
* not need to separately select which header type to use when using this
* function to allocate the message buffers.
*/
struct eap_hdr * eap_msg_alloc(int vendor, EapType type, size_t *len,
size_t payload_len, u8 code, u8 identifier,
u8 **payload)
{
struct eap_hdr *hdr;
u8 *pos;
*len = sizeof(struct eap_hdr) + (vendor == EAP_VENDOR_IETF ? 1 : 8) +
payload_len;
hdr = os_malloc(*len);
if (hdr) {
hdr->code = code;
hdr->identifier = identifier;
hdr->length = host_to_be16(*len);
pos = (u8 *) (hdr + 1);
if (vendor == EAP_VENDOR_IETF) {
*pos++ = type;
} else {
*pos++ = EAP_TYPE_EXPANDED;
WPA_PUT_BE24(pos, vendor);
pos += 3;
WPA_PUT_BE32(pos, type);
pos += 4;
}
if (payload)
*payload = pos;
}
return hdr;
}
/**
* eap_notify_pending - Notify that EAP method is ready to re-process a request
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*
* An EAP method can perform a pending operation (e.g., to get a response from
* an external process). Once the response is available, this function can be
* used to request EAPOL state machine to retry delivering the previously
* received (and still unanswered) EAP request to EAP state machine.
*/
void eap_notify_pending(struct eap_sm *sm)
{
sm->eapol_cb->notify_pending(sm->eapol_ctx);
}
/**
* eap_invalidate_cached_session - Mark cached session data invalid
* @sm: Pointer to EAP state machine allocated with eap_sm_init()
*/
void eap_invalidate_cached_session(struct eap_sm *sm)
{
if (sm)
eap_deinit_prev_method(sm, "invalidate");
}
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