EAP-SIM/AKA: fixed initialization to verify PIN even if identity is set

[libeap.git] / src / eap_peer / eap.c

/*
 * EAP peer state machines (RFC 4137)
 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 *
 * 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 "eap_config.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 struct wpabuf * eap_sm_buildNak(struct eap_sm *sm, int id);
static void eap_sm_processIdentity(struct eap_sm *sm,
                                   const struct wpabuf *req);
static void eap_sm_processNotify(struct eap_sm *sm, const struct wpabuf *req);
static struct wpabuf * eap_sm_buildNotify(int id);
static void eap_sm_parseEapReq(struct eap_sm *sm, const struct wpabuf *req);
#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 struct wpabuf * eapol_get_eapReqData(struct eap_sm *sm)
{
        return sm->eapol_cb->get_eapReqData(sm->eapol_ctx);
}


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;
}


/**
 * eap_allowed_method - Check whether EAP method is allowed
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 * @vendor: Vendor-Id for expanded types or 0 = IETF for legacy types
 * @method: EAP type
 * Returns: 1 = allowed EAP method, 0 = not allowed
 */
static int eap_allowed_method(struct eap_sm *sm, int vendor, u32 method)
{
        struct eap_peer_config *config = eap_get_config(sm);
        int i;
        struct eap_method_type *m;

        if (config == NULL || config->eap_methods == NULL)
                return 1;

        m = config->eap_methods;
        for (i = 0; m[i].vendor != EAP_VENDOR_IETF ||
                     m[i].method != EAP_TYPE_NONE; i++) {
                if (m[i].vendor == vendor && m[i].method == method)
                        return 1;
        }
        return 0;
}


/*
 * 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 struct wpabuf *eapReqData;

        SM_ENTRY(EAP, RECEIVED);
        eapReqData = eapol_get_eapReqData(sm);
        /* parse rxReq, rxSuccess, rxFailure, reqId, reqMethod */
        eap_sm_parseEapReq(sm, eapReqData);
        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_peer_get_eap_method(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 eap_peer_config *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:
        wpabuf_free(sm->eapRespData);
        sm->eapRespData = NULL;
        sm->eapRespData = eap_sm_buildNak(sm, sm->reqId);
}


/*
 * The method processing happens here. The request from the authenticator is
 * processed, and an appropriate response packet is built.
 */
SM_STATE(EAP, METHOD)
{
        struct wpabuf *eapReqData;
        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);

        /*
         * 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;
        wpabuf_free(sm->eapRespData);
        sm->eapRespData = NULL;
        sm->eapRespData = sm->m->process(sm, sm->eap_method_priv, &ret,
                                         eapReqData);
        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);
        wpabuf_free(sm->lastRespData);
        if (sm->eapRespData) {
                if (sm->workaround)
                        os_memcpy(sm->last_md5, sm->req_md5, 16);
                sm->lastId = sm->reqId;
                sm->lastRespData = wpabuf_dup(sm->eapRespData);
                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 struct wpabuf *eapReqData;

        SM_ENTRY(EAP, IDENTITY);
        eapReqData = eapol_get_eapReqData(sm);
        eap_sm_processIdentity(sm, eapReqData);
        wpabuf_free(sm->eapRespData);
        sm->eapRespData = NULL;
        sm->eapRespData = eap_sm_buildIdentity(sm, sm->reqId, 0);
}


/*
 * Handles requests for Notification method and builds a response.
 */
SM_STATE(EAP, NOTIFICATION)
{
        const struct wpabuf *eapReqData;

        SM_ENTRY(EAP, NOTIFICATION);
        eapReqData = eapol_get_eapReqData(sm);
        eap_sm_processNotify(sm, eapReqData);
        wpabuf_free(sm->eapRespData);
        sm->eapRespData = NULL;
        sm->eapRespData = eap_sm_buildNotify(sm->reqId);
}


/*
 * This state retransmits the previous response packet.
 */
SM_STATE(EAP, RETRANSMIT)
{
        SM_ENTRY(EAP, RETRANSMIT);
        wpabuf_free(sm->eapRespData);
        if (sm->lastRespData)
                sm->eapRespData = wpabuf_dup(sm->lastRespData);
        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
 */

static void eap_peer_sm_step_idle(struct eap_sm *sm)
{
        /*
         * 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);
}


static int eap_peer_req_is_duplicate(struct eap_sm *sm)
{
        int duplicate;

        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;
        }

        return duplicate;
}


static void eap_peer_sm_step_received(struct eap_sm *sm)
{
        int duplicate = eap_peer_req_is_duplicate(sm);

        /*
         * 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);
}


static void eap_peer_sm_step_local(struct eap_sm *sm)
{
        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:
                eap_peer_sm_step_idle(sm);
                break;
        case EAP_RECEIVED:
                eap_peer_sm_step_received(sm);
                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;
        }
}


SM_STEP(EAP)
{
        /* Global transitions */
        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 {
                /* Local transitions */
                eap_peer_sm_step_local(sm);
        }
}


static Boolean eap_sm_allowMethod(struct eap_sm *sm, int vendor,
                                  EapType method)
{
        if (!eap_allowed_method(sm, vendor, method)) {
                wpa_printf(MSG_DEBUG, "EAP: configuration does not allow: "
                           "vendor %u method %u", vendor, method);
                return FALSE;
        }
        if (eap_peer_get_eap_method(vendor, method))
                return TRUE;
        wpa_printf(MSG_DEBUG, "EAP: not included in build: "
                   "vendor %u method %u", vendor, method);
        return FALSE;
}


static struct wpabuf * eap_sm_build_expanded_nak(
        struct eap_sm *sm, int id, const struct eap_method *methods,
        size_t count)
{
        struct wpabuf *resp;
        int found = 0;
        const struct eap_method *m;

        wpa_printf(MSG_DEBUG, "EAP: Building expanded EAP-Nak");

        /* RFC 3748 - 5.3.2: Expanded Nak */
        resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EXPANDED,
                             8 + 8 * (count + 1), EAP_CODE_RESPONSE, id);
        if (resp == NULL)
                return NULL;

        wpabuf_put_be24(resp, EAP_VENDOR_IETF);
        wpabuf_put_be32(resp, EAP_TYPE_NAK);

        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 (eap_allowed_method(sm, m->vendor, m->method)) {
                        wpa_printf(MSG_DEBUG, "EAP: allowed type: "
                                   "vendor=%u method=%u",
                                   m->vendor, m->method);
                        wpabuf_put_u8(resp, EAP_TYPE_EXPANDED);
                        wpabuf_put_be24(resp, m->vendor);
                        wpabuf_put_be32(resp, m->method);

                        found++;
                }
        }
        if (!found) {
                wpa_printf(MSG_DEBUG, "EAP: no more allowed methods");
                wpabuf_put_u8(resp, EAP_TYPE_EXPANDED);
                wpabuf_put_be24(resp, EAP_VENDOR_IETF);
                wpabuf_put_be32(resp, EAP_TYPE_NONE);
        }

        eap_update_len(resp);

        return resp;
}


static struct wpabuf * eap_sm_buildNak(struct eap_sm *sm, int id)
{
        struct wpabuf *resp;
        u8 *start;
        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, methods, count);

        /* RFC 3748 - 5.3.1: Legacy Nak */
        resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK,
                             sizeof(struct eap_hdr) + 1 + count + 1,
                             EAP_CODE_RESPONSE, id);
        if (resp == NULL)
                return NULL;

        start = wpabuf_put(resp, 0);
        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 (eap_allowed_method(sm, m->vendor, m->method)) {
                        if (m->vendor != EAP_VENDOR_IETF) {
                                if (expanded_found)
                                        continue;
                                expanded_found = 1;
                                wpabuf_put_u8(resp, EAP_TYPE_EXPANDED);
                        } else
                                wpabuf_put_u8(resp, m->method);
                        found++;
                }
        }
        if (!found)
                wpabuf_put_u8(resp, EAP_TYPE_NONE);
        wpa_hexdump(MSG_DEBUG, "EAP: allowed methods", start, found);

        eap_update_len(resp);

        return resp;
}


static void eap_sm_processIdentity(struct eap_sm *sm, const struct wpabuf *req)
{
        const struct eap_hdr *hdr = wpabuf_head(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 eap_peer_config *conf)
{
        int aka = 0;
        char imsi[100];
        size_t imsi_len;
        struct eap_method_type *m = conf->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(conf->identity);
        conf->identity = os_malloc(1 + imsi_len);
        if (conf->identity == NULL) {
                wpa_printf(MSG_WARNING, "Failed to allocate buffer for "
                           "IMSI-based identity");
                return -1;
        }

        conf->identity[0] = aka ? '0' : '1';
        os_memcpy(conf->identity + 1, imsi, imsi_len);
        conf->identity_len = 1 + imsi_len;

        return 0;
}
#endif /* PCSC_FUNCS */


static int eap_sm_set_scard_pin(struct eap_sm *sm,
                                struct eap_peer_config *conf)
{
#ifdef PCSC_FUNCS
        if (scard_set_pin(sm->scard_ctx, conf->pin)) {
                /*
                 * Make sure the same PIN is not tried again in order to avoid
                 * blocking SIM.
                 */
                os_free(conf->pin);
                conf->pin = NULL;

                wpa_printf(MSG_WARNING, "PIN validation failed");
                eap_sm_request_pin(sm);
                return -1;
        }
        return 0;
#else /* PCSC_FUNCS */
        return -1;
#endif /* PCSC_FUNCS */
}

static int eap_sm_get_scard_identity(struct eap_sm *sm,
                                     struct eap_peer_config *conf)
{
#ifdef PCSC_FUNCS
        if (eap_sm_set_scard_pin(sm, conf))
                return -1;

        return eap_sm_imsi_identity(sm, conf);
#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_peer_sm_init()
 * @id: EAP identifier for the packet
 * @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.
 */
struct wpabuf * eap_sm_buildIdentity(struct eap_sm *sm, int id, int encrypted)
{
        struct eap_peer_config *config = eap_get_config(sm);
        struct wpabuf *resp;
        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;
                }
        } else if (config->pcsc) {
                if (eap_sm_set_scard_pin(sm, config) < 0)
                        return NULL;
        }

        resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, identity_len,
                             EAP_CODE_RESPONSE, id);
        if (resp == NULL)
                return NULL;

        wpabuf_put_data(resp, identity, identity_len);

        return resp;
}


static void eap_sm_processNotify(struct eap_sm *sm, const struct wpabuf *req)
{
        const u8 *pos;
        char *msg;
        size_t i, msg_len;

        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_NOTIFICATION, req,
                               &msg_len);
        if (pos == NULL)
                return;
        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 struct wpabuf * eap_sm_buildNotify(int id)
{
        struct wpabuf *resp;

        wpa_printf(MSG_DEBUG, "EAP: Generating EAP-Response Notification");
        resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NOTIFICATION, 0,
                             EAP_CODE_RESPONSE, id);
        if (resp == NULL)
                return NULL;

        return resp;
}


static void eap_sm_parseEapReq(struct eap_sm *sm, const struct wpabuf *req)
{
        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 || wpabuf_len(req) < sizeof(*hdr))
                return;

        hdr = wpabuf_head(req);
        plen = be_to_host16(hdr->length);
        if (plen > wpabuf_len(req)) {
                wpa_printf(MSG_DEBUG, "EAP: Ignored truncated EAP-Packet "
                           "(len=%lu plen=%lu)",
                           (unsigned long) wpabuf_len(req),
                           (unsigned long) plen);
                return;
        }

        sm->reqId = hdr->identifier;

        if (sm->workaround) {
                const u8 *addr[1];
                addr[0] = wpabuf_head(req);
                md5_vector(1, addr, &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_peer_sm_init - Allocate and initialize EAP peer 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_peer_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_peer_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;
        if (conf->mac_addr)
                os_memcpy(sm->mac_addr, conf->mac_addr, ETH_ALEN);

        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_peer_sm_deinit - Deinitialize and free an EAP peer state machine
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 *
 * This function deinitializes EAP state machine and frees all allocated
 * resources.
 */
void eap_peer_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_peer_sm_step - Step EAP peer state machine
 * @sm: Pointer to EAP state machine allocated with eap_peer_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_peer_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_peer_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)
{
        wpabuf_free(sm->lastRespData);
        sm->lastRespData = NULL;
        wpabuf_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_peer_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_peer_get_eap_method(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 eap_peer_config *config;
        char *field, *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;
        }

        if (sm->eapol_cb->eap_param_needed)
                sm->eapol_cb->eap_param_needed(sm->eapol_ctx, field, txt);
}
#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_peer_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_peer_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_peer_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_peer_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_peer_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_peer_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_peer_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 eap_peer_config *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_peer_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 eap_peer_config *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_peer_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_peer_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_peer_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 eap_peer_config.
 */
struct eap_peer_config * eap_get_config(struct eap_sm *sm)
{
        return sm->eapol_cb->get_config(sm->eapol_ctx);
}


/**
 * eap_get_config_identity - Get identity from the network configuration
 * @sm: Pointer to EAP state machine allocated with eap_peer_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 eap_peer_config *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_peer_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 eap_peer_config *config = eap_get_config(sm);
        if (config == NULL)
                return NULL;
        *len = config->password_len;
        return config->password;
}


/**
 * eap_get_config_password2 - Get password from the network configuration
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 * @len: Buffer for the length of the password
 * @hash: Buffer for returning whether the password is stored as a
 * NtPasswordHash instead of plaintext password; can be %NULL if this
 * information is not needed
 * Returns: Pointer to the password or %NULL if not found
 */
const u8 * eap_get_config_password2(struct eap_sm *sm, size_t *len, int *hash)
{
        struct eap_peer_config *config = eap_get_config(sm);
        if (config == NULL)
                return NULL;
        *len = config->password_len;
        if (hash)
                *hash = !!(config->flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH);
        return config->password;
}


/**
 * eap_get_config_new_password - Get new password from network configuration
 * @sm: Pointer to EAP state machine allocated with eap_peer_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 eap_peer_config *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_peer_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 eap_peer_config *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_peer_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 eap_peer_config *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_get_config_phase1 - Get phase1 data from the network configuration
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 * Returns: Pointer to the phase1 data or %NULL if not found
 */
const char * eap_get_config_phase1(struct eap_sm *sm)
{
        struct eap_peer_config *config = eap_get_config(sm);
        if (config == NULL)
                return NULL;
        return config->phase1;
}


/**
 * eap_get_config_phase2 - Get phase2 data from the network configuration
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 * Returns: Pointer to the phase1 data or %NULL if not found
 */
const char * eap_get_config_phase2(struct eap_sm *sm)
{
        struct eap_peer_config *config = eap_get_config(sm);
        if (config == NULL)
                return NULL;
        return config->phase2;
}


/**
 * eap_key_available - Get key availability (eapKeyAvailable variable)
 * @sm: Pointer to EAP state machine allocated with eap_peer_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_peer_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_peer_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_peer_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_peer_sm_init()
 * 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.
 */
struct wpabuf * eap_get_eapRespData(struct eap_sm *sm)
{
        struct wpabuf *resp;

        if (sm == NULL || sm->eapRespData == NULL)
                return NULL;

        resp = sm->eapRespData;
        sm->eapRespData = NULL;

        return resp;
}


/**
 * eap_sm_register_scard_ctx - Notification of smart card context
 * @sm: Pointer to EAP state machine allocated with eap_peer_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_set_config_blob - Set or add a named configuration blob
 * @sm: Pointer to EAP state machine allocated with eap_peer_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)
{
#ifndef CONFIG_NO_CONFIG_BLOBS
        sm->eapol_cb->set_config_blob(sm->eapol_ctx, blob);
#endif /* CONFIG_NO_CONFIG_BLOBS */
}


/**
 * eap_get_config_blob - Get a named configuration blob
 * @sm: Pointer to EAP state machine allocated with eap_peer_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)
{
#ifndef CONFIG_NO_CONFIG_BLOBS
        return sm->eapol_cb->get_config_blob(sm->eapol_ctx, name);
#else /* CONFIG_NO_CONFIG_BLOBS */
        return NULL;
#endif /* CONFIG_NO_CONFIG_BLOBS */
}


/**
 * eap_set_force_disabled - Set force_disabled flag
 * @sm: Pointer to EAP state machine allocated with eap_peer_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_notify_pending - Notify that EAP method is ready to re-process a request
 * @sm: Pointer to EAP state machine allocated with eap_peer_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_peer_sm_init()
 */
void eap_invalidate_cached_session(struct eap_sm *sm)
{
        if (sm)
                eap_deinit_prev_method(sm, "invalidate");
}