eap_server_peap.c

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/*
 * hostapd / EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_common/eap_tlv_common.h"
#include "eap_common/eap_peap_common.h"
#include "tncs.h"


/* Maximum supported PEAP version
 * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
 * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
 * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
 */
#define EAP_PEAP_VERSION 1


static void eap_peap_reset(struct eap_sm *sm, void *priv);


struct eap_peap_data {
        struct eap_ssl_data ssl;
        enum {
                START, PHASE1, PHASE1_ID2, PHASE2_START, PHASE2_ID,
                PHASE2_METHOD, PHASE2_SOH,
                PHASE2_TLV, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE
        } state;

        int peap_version;
        int recv_version;
        const struct eap_method *phase2_method;
        void *phase2_priv;
        int force_version;
        struct wpabuf *pending_phase2_resp;
        enum { TLV_REQ_NONE, TLV_REQ_SUCCESS, TLV_REQ_FAILURE } tlv_request;
        int crypto_binding_sent;
        int crypto_binding_used;
        enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
        u8 binding_nonce[32];
        u8 ipmk[40];
        u8 cmk[20];
        u8 *phase2_key;
        size_t phase2_key_len;
        struct wpabuf *soh_response;
};


static const char * eap_peap_state_txt(int state)
{
        switch (state) {
        case START:
                return "START";
        case PHASE1:
                return "PHASE1";
        case PHASE1_ID2:
                return "PHASE1_ID2";
        case PHASE2_START:
                return "PHASE2_START";
        case PHASE2_ID:
                return "PHASE2_ID";
        case PHASE2_METHOD:
                return "PHASE2_METHOD";
        case PHASE2_SOH:
                return "PHASE2_SOH";
        case PHASE2_TLV:
                return "PHASE2_TLV";
        case SUCCESS_REQ:
                return "SUCCESS_REQ";
        case FAILURE_REQ:
                return "FAILURE_REQ";
        case SUCCESS:
                return "SUCCESS";
        case FAILURE:
                return "FAILURE";
        default:
                return "Unknown?!";
        }
}


static void eap_peap_state(struct eap_peap_data *data, int state)
{
        wpa_printf(MSG_DEBUG, "EAP-PEAP: %s -> %s",
                   eap_peap_state_txt(data->state),
                   eap_peap_state_txt(state));
        data->state = state;
}


static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
{
        struct wpabuf *e;
        struct eap_tlv_hdr *tlv;

        if (buf == NULL)
                return NULL;

        /* Encapsulate EAP packet in EAP-Payload TLV */
        wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
        e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
        if (e == NULL) {
                wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
                           "for TLV encapsulation");
                wpabuf_free(buf);
                return NULL;
        }
        tlv = wpabuf_put(e, sizeof(*tlv));
        tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
                                     EAP_TLV_EAP_PAYLOAD_TLV);
        tlv->length = host_to_be16(wpabuf_len(buf));
        wpabuf_put_buf(e, buf);
        wpabuf_free(buf);
        return e;
}


static void eap_peap_req_success(struct eap_sm *sm,
                                 struct eap_peap_data *data)
{
        if (data->state == FAILURE || data->state == FAILURE_REQ) {
                eap_peap_state(data, FAILURE);
                return;
        }

        if (data->peap_version == 0) {
                data->tlv_request = TLV_REQ_SUCCESS;
                eap_peap_state(data, PHASE2_TLV);
        } else {
                eap_peap_state(data, SUCCESS_REQ);
        }
}


static void eap_peap_req_failure(struct eap_sm *sm,
                                 struct eap_peap_data *data)
{
        if (data->state == FAILURE || data->state == FAILURE_REQ ||
            data->state == SUCCESS_REQ || data->tlv_request != TLV_REQ_NONE) {
                eap_peap_state(data, FAILURE);
                return;
        }

        if (data->peap_version == 0) {
                data->tlv_request = TLV_REQ_FAILURE;
                eap_peap_state(data, PHASE2_TLV);
        } else {
                eap_peap_state(data, FAILURE_REQ);
        }
}


static void * eap_peap_init(struct eap_sm *sm)
{
        struct eap_peap_data *data;

        data = os_zalloc(sizeof(*data));
        if (data == NULL)
                return NULL;
        data->peap_version = EAP_PEAP_VERSION;
        data->force_version = -1;
        if (sm->user && sm->user->force_version >= 0) {
                data->force_version = sm->user->force_version;
                wpa_printf(MSG_DEBUG, "EAP-PEAP: forcing version %d",
                           data->force_version);
                data->peap_version = data->force_version;
        }
        data->state = START;
        data->crypto_binding = OPTIONAL_BINDING;

        if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
                wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
                eap_peap_reset(sm, data);
                return NULL;
        }

        return data;
}


static void eap_peap_reset(struct eap_sm *sm, void *priv)
{
        struct eap_peap_data *data = priv;
        if (data == NULL)
                return;
        if (data->phase2_priv && data->phase2_method)
                data->phase2_method->reset(sm, data->phase2_priv);
        eap_server_tls_ssl_deinit(sm, &data->ssl);
        wpabuf_free(data->pending_phase2_resp);
        os_free(data->phase2_key);
        wpabuf_free(data->soh_response);
        os_free(data);
}


static struct wpabuf * eap_peap_build_start(struct eap_sm *sm,
                                            struct eap_peap_data *data, u8 id)
{
        struct wpabuf *req;

        req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP, 1,
                            EAP_CODE_REQUEST, id);
        if (req == NULL) {
                wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to allocate memory for"
                           " request");
                eap_peap_state(data, FAILURE);
                return NULL;
        }

        wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->peap_version);

        eap_peap_state(data, PHASE1);

        return req;
}


static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
                                                 struct eap_peap_data *data,
                                                 u8 id)
{
        struct wpabuf *buf, *encr_req, msgbuf;
        const u8 *req;
        size_t req_len;

        if (data->phase2_method == NULL || data->phase2_priv == NULL) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 method not ready");
                return NULL;
        }
        buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
        if (data->peap_version >= 2 && buf)
                buf = eap_peapv2_tlv_eap_payload(buf);
        if (buf == NULL)
                return NULL;

        req = wpabuf_head(buf);
        req_len = wpabuf_len(buf);
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
                        req, req_len);

        if (data->peap_version == 0 &&
            data->phase2_method->method != EAP_TYPE_TLV) {
                req += sizeof(struct eap_hdr);
                req_len -= sizeof(struct eap_hdr);
        }

        wpabuf_set(&msgbuf, req, req_len);
        encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
        wpabuf_free(buf);

        return encr_req;
}


#ifdef EAP_SERVER_TNC
static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
                                                 struct eap_peap_data *data,
                                                 u8 id)
{
        struct wpabuf *buf1, *buf, *encr_req, msgbuf;
        const u8 *req;
        size_t req_len;

        buf1 = tncs_build_soh_request();
        if (buf1 == NULL)
                return NULL;

        buf = eap_msg_alloc(EAP_VENDOR_MICROSOFT, 0x21, wpabuf_len(buf1),
                            EAP_CODE_REQUEST, id);
        if (buf == NULL) {
                wpabuf_free(buf1);
                return NULL;
        }
        wpabuf_put_buf(buf, buf1);
        wpabuf_free(buf1);

        req = wpabuf_head(buf);
        req_len = wpabuf_len(buf);

        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 SOH data",
                        req, req_len);

        req += sizeof(struct eap_hdr);
        req_len -= sizeof(struct eap_hdr);
        wpabuf_set(&msgbuf, req, req_len);

        encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
        wpabuf_free(buf);

        return encr_req;
}
#endif /* EAP_SERVER_TNC */


static void eap_peap_get_isk(struct eap_peap_data *data,
                             u8 *isk, size_t isk_len)
{
        size_t key_len;

        os_memset(isk, 0, isk_len);
        if (data->phase2_key == NULL)
                return;

        key_len = data->phase2_key_len;
        if (key_len > isk_len)
                key_len = isk_len;
        os_memcpy(isk, data->phase2_key, key_len);
}


static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
{
        u8 *tk;
        u8 isk[32], imck[60];

        /*
         * Tunnel key (TK) is the first 60 octets of the key generated by
         * phase 1 of PEAP (based on TLS).
         */
        tk = eap_server_tls_derive_key(sm, &data->ssl, "client EAP encryption",
                                       EAP_TLS_KEY_LEN);
        if (tk == NULL)
                return -1;
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);

        eap_peap_get_isk(data, isk, sizeof(isk));
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));

        /*
         * IPMK Seed = "Inner Methods Compound Keys" | ISK
         * TempKey = First 40 octets of TK
         * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
         * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
         * in the end of the label just before ISK; is that just a typo?)
         */
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
        peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
                     isk, sizeof(isk), imck, sizeof(imck));
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
                        imck, sizeof(imck));

        os_free(tk);

        /* TODO: fast-connect: IPMK|CMK = TK */
        os_memcpy(data->ipmk, imck, 40);
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
        os_memcpy(data->cmk, imck + 40, 20);
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);

        return 0;
}


static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
                                                 struct eap_peap_data *data,
                                                 u8 id)
{
        struct wpabuf *buf, *encr_req;
        size_t mlen;

        mlen = 6; /* Result TLV */
        if (data->crypto_binding != NO_BINDING)
                mlen += 60; /* Cryptobinding TLV */
#ifdef EAP_SERVER_TNC
        if (data->soh_response)
                mlen += wpabuf_len(data->soh_response);
#endif /* EAP_SERVER_TNC */

        buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, mlen,
                            EAP_CODE_REQUEST, id);
        if (buf == NULL)
                return NULL;

        wpabuf_put_u8(buf, 0x80); /* Mandatory */
        wpabuf_put_u8(buf, EAP_TLV_RESULT_TLV);
        /* Length */
        wpabuf_put_be16(buf, 2);
        /* Status */
        wpabuf_put_be16(buf, data->tlv_request == TLV_REQ_SUCCESS ?
                        EAP_TLV_RESULT_SUCCESS : EAP_TLV_RESULT_FAILURE);

        if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
            data->crypto_binding != NO_BINDING) {
                u8 *mac;
                u8 eap_type = EAP_TYPE_PEAP;
                const u8 *addr[2];
                size_t len[2];
                u16 tlv_type;

#ifdef EAP_SERVER_TNC
                if (data->soh_response) {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Adding MS-SOH "
                                   "Response TLV");
                        wpabuf_put_buf(buf, data->soh_response);
                        wpabuf_free(data->soh_response);
                        data->soh_response = NULL;
                }
#endif /* EAP_SERVER_TNC */

                if (eap_peap_derive_cmk(sm, data) < 0 ||
                    os_get_random(data->binding_nonce, 32)) {
                        wpabuf_free(buf);
                        return NULL;
                }

                /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
                addr[0] = wpabuf_put(buf, 0);
                len[0] = 60;
                addr[1] = &eap_type;
                len[1] = 1;

                tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
                if (data->peap_version >= 2)
                        tlv_type |= EAP_TLV_TYPE_MANDATORY;
                wpabuf_put_be16(buf, tlv_type);
                wpabuf_put_be16(buf, 56);

                wpabuf_put_u8(buf, 0); /* Reserved */
                wpabuf_put_u8(buf, data->peap_version); /* Version */
                wpabuf_put_u8(buf, data->recv_version); /* RecvVersion */
                wpabuf_put_u8(buf, 0); /* SubType: 0 = Request, 1 = Response */
                wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
                mac = wpabuf_put(buf, 20); /* Compound_MAC */
                wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK",
                            data->cmk, 20);
                wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
                            addr[0], len[0]);
                wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
                            addr[1], len[1]);
                hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
                wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC",
                            mac, SHA1_MAC_LEN);
                data->crypto_binding_sent = 1;
        }

        wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
                            buf);

        encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
        wpabuf_free(buf);

        return encr_req;
}


static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
                                                  struct eap_peap_data *data,
                                                  u8 id, int success)
{
        struct wpabuf *encr_req, msgbuf;
        size_t req_len;
        struct eap_hdr *hdr;

        req_len = sizeof(*hdr);
        hdr = os_zalloc(req_len);
        if (hdr == NULL)
                return NULL;

        hdr->code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
        hdr->identifier = id;
        hdr->length = host_to_be16(req_len);

        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
                        (u8 *) hdr, req_len);

        wpabuf_set(&msgbuf, hdr, req_len);
        encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
        os_free(hdr);

        return encr_req;
}


static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
        struct eap_peap_data *data = priv;

        if (data->ssl.state == FRAG_ACK) {
                return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
                                                data->peap_version);
        }

        if (data->ssl.state == WAIT_FRAG_ACK) {
                return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
                                                data->peap_version, id);
        }

        switch (data->state) {
        case START:
                return eap_peap_build_start(sm, data, id);
        case PHASE1:
        case PHASE1_ID2:
                if (data->peap_version < 2 &&
                    tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
                                   "starting Phase2");
                        eap_peap_state(data, PHASE2_START);
                }
                break;
        case PHASE2_ID:
        case PHASE2_METHOD:
                wpabuf_free(data->ssl.tls_out);
                data->ssl.tls_out_pos = 0;
                data->ssl.tls_out = eap_peap_build_phase2_req(sm, data, id);
                break;
#ifdef EAP_SERVER_TNC
        case PHASE2_SOH:
                wpabuf_free(data->ssl.tls_out);
                data->ssl.tls_out_pos = 0;
                data->ssl.tls_out = eap_peap_build_phase2_soh(sm, data, id);
                break;
#endif /* EAP_SERVER_TNC */
        case PHASE2_TLV:
                wpabuf_free(data->ssl.tls_out);
                data->ssl.tls_out_pos = 0;
                data->ssl.tls_out = eap_peap_build_phase2_tlv(sm, data, id);
                break;
        case SUCCESS_REQ:
                wpabuf_free(data->ssl.tls_out);
                data->ssl.tls_out_pos = 0;
                data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
                                                               1);
                break;
        case FAILURE_REQ:
                wpabuf_free(data->ssl.tls_out);
                data->ssl.tls_out_pos = 0;
                data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
                                                               0);
                break;
        default:
                wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
                           __func__, data->state);
                return NULL;
        }

        return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
                                        data->peap_version, id);
}


static Boolean eap_peap_check(struct eap_sm *sm, void *priv,
                              struct wpabuf *respData)
{
        const u8 *pos;
        size_t len;

        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PEAP, respData, &len);
        if (pos == NULL || len < 1) {
                wpa_printf(MSG_INFO, "EAP-PEAP: Invalid frame");
                return TRUE;
        }

        return FALSE;
}


static int eap_peap_phase2_init(struct eap_sm *sm, struct eap_peap_data *data,
                                EapType eap_type)
{
        if (data->phase2_priv && data->phase2_method) {
                data->phase2_method->reset(sm, data->phase2_priv);
                data->phase2_method = NULL;
                data->phase2_priv = NULL;
        }
        data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
                                                        eap_type);
        if (!data->phase2_method)
                return -1;

        sm->init_phase2 = 1;
        data->phase2_priv = data->phase2_method->init(sm);
        sm->init_phase2 = 0;
        return 0;
}


static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
                                          struct eap_peap_data *data,
                                          const u8 *crypto_tlv,
                                          size_t crypto_tlv_len)
{
        u8 buf[61], mac[SHA1_MAC_LEN];
        const u8 *pos;

        if (crypto_tlv_len != 4 + 56) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
                           "length %d", (int) crypto_tlv_len);
                return -1;
        }

        pos = crypto_tlv;
        pos += 4; /* TLV header */
        if (pos[1] != data->peap_version) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
                           "mismatch (was %d; expected %d)",
                           pos[1], data->peap_version);
                return -1;
        }

        if (pos[3] != 1) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
                           "SubType %d", pos[3]);
                return -1;
        }
        pos += 4;
        pos += 32; /* Nonce */

        /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
        os_memcpy(buf, crypto_tlv, 60);
        os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
        buf[60] = EAP_TYPE_PEAP;
        hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);

        if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
                           "cryptobinding TLV");
                wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);
                wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding seed data",
                            buf, 61);
                return -1;
        }

        wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");

        return 0;
}


static void eap_peap_process_phase2_tlv(struct eap_sm *sm,
                                        struct eap_peap_data *data,
                                        struct wpabuf *in_data)
{
        const u8 *pos;
        size_t left;
        const u8 *result_tlv = NULL, *crypto_tlv = NULL;
        size_t result_tlv_len = 0, crypto_tlv_len = 0;
        int tlv_type, mandatory, tlv_len;

        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, in_data, &left);
        if (pos == NULL) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid EAP-TLV header");
                return;
        }

        /* Parse TLVs */
        wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs", pos, left);
        while (left >= 4) {
                mandatory = !!(pos[0] & 0x80);
                tlv_type = pos[0] & 0x3f;
                tlv_type = (tlv_type << 8) | pos[1];
                tlv_len = ((int) pos[2] << 8) | pos[3];
                pos += 4;
                left -= 4;
                if ((size_t) tlv_len > left) {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
                                   "(tlv_len=%d left=%lu)", tlv_len,
                                   (unsigned long) left);
                        eap_peap_state(data, FAILURE);
                        return;
                }
                switch (tlv_type) {
                case EAP_TLV_RESULT_TLV:
                        result_tlv = pos;
                        result_tlv_len = tlv_len;
                        break;
                case EAP_TLV_CRYPTO_BINDING_TLV:
                        crypto_tlv = pos;
                        crypto_tlv_len = tlv_len;
                        break;
                default:
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
                                   "%d%s", tlv_type,
                                   mandatory ? " (mandatory)" : "");
                        if (mandatory) {
                                eap_peap_state(data, FAILURE);
                                return;
                        }
                        /* Ignore this TLV, but process other TLVs */
                        break;
                }

                pos += tlv_len;
                left -= tlv_len;
        }
        if (left) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
                           "Request (left=%lu)", (unsigned long) left);
                eap_peap_state(data, FAILURE);
                return;
        }

        /* Process supported TLVs */
        if (crypto_tlv && data->crypto_binding_sent) {
                wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
                            crypto_tlv, crypto_tlv_len);
                if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
                                                   crypto_tlv_len + 4) < 0) {
                        eap_peap_state(data, FAILURE);
                        return;
                }
                data->crypto_binding_used = 1;
        } else if (!crypto_tlv && data->crypto_binding_sent &&
                   data->crypto_binding == REQUIRE_BINDING) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
                eap_peap_state(data, FAILURE);
                return;
        }

        if (result_tlv) {
                int status;
                const char *requested;

                wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Result TLV",
                            result_tlv, result_tlv_len);
                if (result_tlv_len < 2) {
                        wpa_printf(MSG_INFO, "EAP-PEAP: Too short Result TLV "
                                   "(len=%lu)",
                                   (unsigned long) result_tlv_len);
                        eap_peap_state(data, FAILURE);
                        return;
                }
                requested = data->tlv_request == TLV_REQ_SUCCESS ? "Success" :
                        "Failure";
                status = WPA_GET_BE16(result_tlv);
                if (status == EAP_TLV_RESULT_SUCCESS) {
                        wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Success "
                                   "- requested %s", requested);
                        if (data->tlv_request == TLV_REQ_SUCCESS)
                                eap_peap_state(data, SUCCESS);
                        else
                                eap_peap_state(data, FAILURE);
                        
                } else if (status == EAP_TLV_RESULT_FAILURE) {
                        wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Failure "
                                   "- requested %s", requested);
                        eap_peap_state(data, FAILURE);
                } else {
                        wpa_printf(MSG_INFO, "EAP-PEAP: Unknown TLV Result "
                                   "Status %d", status);
                        eap_peap_state(data, FAILURE);
                }
        }
}


#ifdef EAP_SERVER_TNC
static void eap_peap_process_phase2_soh(struct eap_sm *sm,
                                        struct eap_peap_data *data,
                                        struct wpabuf *in_data)
{
        const u8 *pos, *vpos;
        size_t left;
        const u8 *soh_tlv = NULL;
        size_t soh_tlv_len = 0;
        int tlv_type, mandatory, tlv_len, vtlv_len;
        u8 next_type;
        u32 vendor_id;

        pos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, in_data, &left);
        if (pos == NULL) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Not a valid SoH EAP "
                           "Extensions Method header - skip TNC");
                goto auth_method;
        }

        /* Parse TLVs */
        wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs (SoH)", pos, left);
        while (left >= 4) {
                mandatory = !!(pos[0] & 0x80);
                tlv_type = pos[0] & 0x3f;
                tlv_type = (tlv_type << 8) | pos[1];
                tlv_len = ((int) pos[2] << 8) | pos[3];
                pos += 4;
                left -= 4;
                if ((size_t) tlv_len > left) {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
                                   "(tlv_len=%d left=%lu)", tlv_len,
                                   (unsigned long) left);
                        eap_peap_state(data, FAILURE);
                        return;
                }
                switch (tlv_type) {
                case EAP_TLV_VENDOR_SPECIFIC_TLV:
                        if (tlv_len < 4) {
                                wpa_printf(MSG_DEBUG, "EAP-PEAP: Too short "
                                           "vendor specific TLV (len=%d)",
                                           (int) tlv_len);
                                eap_peap_state(data, FAILURE);
                                return;
                        }

                        vendor_id = WPA_GET_BE32(pos);
                        if (vendor_id != EAP_VENDOR_MICROSOFT) {
                                if (mandatory) {
                                        eap_peap_state(data, FAILURE);
                                        return;
                                }
                                break;
                        }

                        vpos = pos + 4;
                        mandatory = !!(vpos[0] & 0x80);
                        tlv_type = vpos[0] & 0x3f;
                        tlv_type = (tlv_type << 8) | vpos[1];
                        vtlv_len = ((int) vpos[2] << 8) | vpos[3];
                        vpos += 4;
                        if (vpos + vtlv_len > pos + left) {
                                wpa_printf(MSG_DEBUG, "EAP-PEAP: Vendor TLV "
                                           "underrun");
                                eap_peap_state(data, FAILURE);
                                return;
                        }

                        if (tlv_type == 1) {
                                soh_tlv = vpos;
                                soh_tlv_len = vtlv_len;
                                break;
                        }

                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported MS-TLV "
                                   "Type %d%s", tlv_type,
                                   mandatory ? " (mandatory)" : "");
                        if (mandatory) {
                                eap_peap_state(data, FAILURE);
                                return;
                        }
                        /* Ignore this TLV, but process other TLVs */
                        break;
                default:
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
                                   "%d%s", tlv_type,
                                   mandatory ? " (mandatory)" : "");
                        if (mandatory) {
                                eap_peap_state(data, FAILURE);
                                return;
                        }
                        /* Ignore this TLV, but process other TLVs */
                        break;
                }

                pos += tlv_len;
                left -= tlv_len;
        }
        if (left) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
                           "Request (left=%lu)", (unsigned long) left);
                eap_peap_state(data, FAILURE);
                return;
        }

        /* Process supported TLVs */
        if (soh_tlv) {
                int failure = 0;
                wpabuf_free(data->soh_response);
                data->soh_response = tncs_process_soh(soh_tlv, soh_tlv_len,
                                                      &failure);
                if (failure) {
                        eap_peap_state(data, FAILURE);
                        return;
                }
        } else {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: No SoH TLV received");
                eap_peap_state(data, FAILURE);
                return;
        }

auth_method:
        eap_peap_state(data, PHASE2_METHOD);
        next_type = sm->user->methods[0].method;
        sm->user_eap_method_index = 1;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
        eap_peap_phase2_init(sm, data, next_type);
}
#endif /* EAP_SERVER_TNC */


static void eap_peap_process_phase2_response(struct eap_sm *sm,
                                             struct eap_peap_data *data,
                                             struct wpabuf *in_data)
{
        u8 next_type = EAP_TYPE_NONE;
        const struct eap_hdr *hdr;
        const u8 *pos;
        size_t left;

        if (data->state == PHASE2_TLV) {
                eap_peap_process_phase2_tlv(sm, data, in_data);
                return;
        }

#ifdef EAP_SERVER_TNC
        if (data->state == PHASE2_SOH) {
                eap_peap_process_phase2_soh(sm, data, in_data);
                return;
        }
#endif /* EAP_SERVER_TNC */

        if (data->phase2_priv == NULL) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - Phase2 not "
                           "initialized?!", __func__);
                return;
        }

        hdr = wpabuf_head(in_data);
        pos = (const u8 *) (hdr + 1);

        if (wpabuf_len(in_data) > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
                left = wpabuf_len(in_data) - sizeof(*hdr);
                wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Phase2 type Nak'ed; "
                            "allowed types", pos + 1, left - 1);
                eap_sm_process_nak(sm, pos + 1, left - 1);
                if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
                    sm->user->methods[sm->user_eap_method_index].method !=
                    EAP_TYPE_NONE) {
                        next_type = sm->user->methods[
                                sm->user_eap_method_index++].method;
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d",
                                   next_type);
                } else {
                        eap_peap_req_failure(sm, data);
                        next_type = EAP_TYPE_NONE;
                }
                eap_peap_phase2_init(sm, data, next_type);
                return;
        }

        if (data->phase2_method->check(sm, data->phase2_priv, in_data)) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 check() asked to "
                           "ignore the packet");
                return;
        }

        data->phase2_method->process(sm, data->phase2_priv, in_data);

        if (sm->method_pending == METHOD_PENDING_WAIT) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method is in "
                           "pending wait state - save decrypted response");
                wpabuf_free(data->pending_phase2_resp);
                data->pending_phase2_resp = wpabuf_dup(in_data);
        }

        if (!data->phase2_method->isDone(sm, data->phase2_priv))
                return;

        if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method failed");
                eap_peap_req_failure(sm, data);
                next_type = EAP_TYPE_NONE;
                eap_peap_phase2_init(sm, data, next_type);
                return;
        }

        os_free(data->phase2_key);
        if (data->phase2_method->getKey) {
                data->phase2_key = data->phase2_method->getKey(
                        sm, data->phase2_priv, &data->phase2_key_len);
                if (data->phase2_key == NULL) {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 getKey "
                                   "failed");
                        eap_peap_req_failure(sm, data);
                        eap_peap_phase2_init(sm, data, EAP_TYPE_NONE);
                        return;
                }
        }

        switch (data->state) {
        case PHASE1_ID2:
        case PHASE2_ID:
        case PHASE2_SOH:
                if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
                        wpa_hexdump_ascii(MSG_DEBUG, "EAP_PEAP: Phase2 "
                                          "Identity not found in the user "
                                          "database",
                                          sm->identity, sm->identity_len);
                        eap_peap_req_failure(sm, data);
                        next_type = EAP_TYPE_NONE;
                        break;
                }

#ifdef EAP_SERVER_TNC
                if (data->state != PHASE2_SOH && sm->tnc &&
                    data->peap_version == 0) {
                        eap_peap_state(data, PHASE2_SOH);
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Try to initialize "
                                   "TNC (NAP SOH)");
                        next_type = EAP_TYPE_NONE;
                        break;
                }
#endif /* EAP_SERVER_TNC */

                eap_peap_state(data, PHASE2_METHOD);
                next_type = sm->user->methods[0].method;
                sm->user_eap_method_index = 1;
                wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
                break;
        case PHASE2_METHOD:
                eap_peap_req_success(sm, data);
                next_type = EAP_TYPE_NONE;
                break;
        case FAILURE:
                break;
        default:
                wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
                           __func__, data->state);
                break;
        }

        eap_peap_phase2_init(sm, data, next_type);
}


static void eap_peap_process_phase2(struct eap_sm *sm,
                                    struct eap_peap_data *data,
                                    const struct wpabuf *respData,
                                    struct wpabuf *in_buf)
{
        struct wpabuf *in_decrypted;
        const struct eap_hdr *hdr;
        size_t len;

        wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
                   " Phase 2", (unsigned long) wpabuf_len(in_buf));

        if (data->pending_phase2_resp) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
                           "skip decryption and use old data");
                eap_peap_process_phase2_response(sm, data,
                                                 data->pending_phase2_resp);
                wpabuf_free(data->pending_phase2_resp);
                data->pending_phase2_resp = NULL;
                return;
        }

        in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
                                              in_buf);
        if (in_decrypted == NULL) {
                wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
                           "data");
                eap_peap_state(data, FAILURE);
                return;
        }

        wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
                            in_decrypted);

        hdr = wpabuf_head(in_decrypted);

        if (data->peap_version == 0 && data->state != PHASE2_TLV) {
                const struct eap_hdr *resp;
                struct eap_hdr *nhdr;
                struct wpabuf *nbuf =
                        wpabuf_alloc(sizeof(struct eap_hdr) +
                                     wpabuf_len(in_decrypted));
                if (nbuf == NULL) {
                        wpabuf_free(in_decrypted);
                        return;
                }

                resp = wpabuf_head(respData);
                nhdr = wpabuf_put(nbuf, sizeof(*nhdr));
                nhdr->code = resp->code;
                nhdr->identifier = resp->identifier;
                nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
                                            wpabuf_len(in_decrypted));
                wpabuf_put_buf(nbuf, in_decrypted);
                wpabuf_free(in_decrypted);

                in_decrypted = nbuf;
        } else if (data->peap_version >= 2) {
                struct eap_tlv_hdr *tlv;
                struct wpabuf *nmsg;

                if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
                        wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
                                   "EAP TLV");
                        wpabuf_free(in_decrypted);
                        return;
                }
                tlv = wpabuf_mhead(in_decrypted);
                if ((be_to_host16(tlv->tlv_type) & EAP_TLV_TYPE_MASK) !=
                    EAP_TLV_EAP_PAYLOAD_TLV) {
                        wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
                        wpabuf_free(in_decrypted);
                        return;
                }
                if (sizeof(*tlv) + be_to_host16(tlv->length) >
                    wpabuf_len(in_decrypted)) {
                        wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
                                   "length");
                        wpabuf_free(in_decrypted);
                        return;
                }
                hdr = (struct eap_hdr *) (tlv + 1);
                if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
                        wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
                                   "EAP packet in EAP TLV");
                        wpabuf_free(in_decrypted);
                        return;
                }

                nmsg = wpabuf_alloc(be_to_host16(hdr->length));
                if (nmsg == NULL) {
                        wpabuf_free(in_decrypted);
                        return;
                }

                wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
                wpabuf_free(in_decrypted);
                in_decrypted = nmsg;
        }

        hdr = wpabuf_head(in_decrypted);
        if (wpabuf_len(in_decrypted) < (int) sizeof(*hdr)) {
                wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
                           "EAP frame (len=%lu)",
                           (unsigned long) wpabuf_len(in_decrypted));
                wpabuf_free(in_decrypted);
                eap_peap_req_failure(sm, data);
                return;
        }
        len = be_to_host16(hdr->length);
        if (len > wpabuf_len(in_decrypted)) {
                wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
                           "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
                           (unsigned long) wpabuf_len(in_decrypted),
                           (unsigned long) len);
                wpabuf_free(in_decrypted);
                eap_peap_req_failure(sm, data);
                return;
        }
        wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
                   "identifier=%d length=%lu", hdr->code, hdr->identifier,
                   (unsigned long) len);
        switch (hdr->code) {
        case EAP_CODE_RESPONSE:
                eap_peap_process_phase2_response(sm, data, in_decrypted);
                break;
        case EAP_CODE_SUCCESS:
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
                if (data->state == SUCCESS_REQ) {
                        eap_peap_state(data, SUCCESS);
                }
                break;
        case EAP_CODE_FAILURE:
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
                eap_peap_state(data, FAILURE);
                break;
        default:
                wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
                           "Phase 2 EAP header", hdr->code);
                break;
        }

        wpabuf_free(in_decrypted);
}


static int eap_peapv2_start_phase2(struct eap_sm *sm,
                                   struct eap_peap_data *data)
{
        struct wpabuf *buf, *buf2;

        wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Phase1 done, include first Phase2 "
                   "payload in the same message");
        eap_peap_state(data, PHASE1_ID2);
        if (eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY))
                return -1;

        /* TODO: which Id to use here? */
        buf = data->phase2_method->buildReq(sm, data->phase2_priv, 6);
        if (buf == NULL)
                return -1;

        buf2 = eap_peapv2_tlv_eap_payload(buf);
        if (buf2 == NULL)
                return -1;

        wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Identity Request", buf2);

        buf = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
                                     buf2);
        wpabuf_free(buf2);

        if (buf == NULL) {
                wpa_printf(MSG_INFO, "EAP-PEAPv2: Failed to encrypt Phase 2 "
                           "data");
                return -1;
        }

        wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Encrypted Identity Request",
                        buf);

        /* Append TLS data into the pending buffer after the Server Finished */
        if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(buf)) < 0) {
                wpabuf_free(buf);
                return -1;
        }
        wpabuf_put_buf(data->ssl.tls_out, buf);
        wpabuf_free(buf);

        return 0;
}


static int eap_peap_process_version(struct eap_sm *sm, void *priv,
                                    int peer_version)
{
        struct eap_peap_data *data = priv;

        data->recv_version = peer_version;
        if (data->force_version >= 0 && peer_version != data->force_version) {
                wpa_printf(MSG_INFO, "EAP-PEAP: peer did not select the forced"
                           " version (forced=%d peer=%d) - reject",
                           data->force_version, peer_version);
                return -1;
        }
        if (peer_version < data->peap_version) {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: peer ver=%d, own ver=%d; "
                           "use version %d",
                           peer_version, data->peap_version, peer_version);
                data->peap_version = peer_version;
        }

        return 0;
}


static void eap_peap_process_msg(struct eap_sm *sm, void *priv,
                                 const struct wpabuf *respData)
{
        struct eap_peap_data *data = priv;

        switch (data->state) {
        case PHASE1:
                if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
                        eap_peap_state(data, FAILURE);
                        break;
                }

                if (data->peap_version >= 2 &&
                    tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
                        if (eap_peapv2_start_phase2(sm, data)) {
                                eap_peap_state(data, FAILURE);
                                break;
                        }
                }
                break;
        case PHASE2_START:
                eap_peap_state(data, PHASE2_ID);
                eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY);
                break;
        case PHASE1_ID2:
        case PHASE2_ID:
        case PHASE2_METHOD:
        case PHASE2_SOH:
        case PHASE2_TLV:
                eap_peap_process_phase2(sm, data, respData, data->ssl.tls_in);
                break;
        case SUCCESS_REQ:
                eap_peap_state(data, SUCCESS);
                break;
        case FAILURE_REQ:
                eap_peap_state(data, FAILURE);
                break;
        default:
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected state %d in %s",
                           data->state, __func__);
                break;
        }
}


static void eap_peap_process(struct eap_sm *sm, void *priv,
                             struct wpabuf *respData)
{
        struct eap_peap_data *data = priv;
        if (eap_server_tls_process(sm, &data->ssl, respData, data,
                                   EAP_TYPE_PEAP, eap_peap_process_version,
                                   eap_peap_process_msg) < 0)
                eap_peap_state(data, FAILURE);
}


static Boolean eap_peap_isDone(struct eap_sm *sm, void *priv)
{
        struct eap_peap_data *data = priv;
        return data->state == SUCCESS || data->state == FAILURE;
}


static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
        struct eap_peap_data *data = priv;
        u8 *eapKeyData;

        if (data->state != SUCCESS)
                return NULL;

        if (data->crypto_binding_used) {
                u8 csk[128];
                /*
                 * Note: It looks like Microsoft implementation requires null
                 * termination for this label while the one used for deriving
                 * IPMK|CMK did not use null termination.
                 */
                peap_prfplus(data->peap_version, data->ipmk, 40,
                             "Session Key Generating Function",
                             (u8 *) "\00", 1, csk, sizeof(csk));
                wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
                eapKeyData = os_malloc(EAP_TLS_KEY_LEN);
                if (eapKeyData) {
                        os_memcpy(eapKeyData, csk, EAP_TLS_KEY_LEN);
                        *len = EAP_TLS_KEY_LEN;
                        wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
                                    eapKeyData, EAP_TLS_KEY_LEN);
                } else {
                        wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive "
                                   "key");
                }

                return eapKeyData;
        }

        /* TODO: PEAPv1 - different label in some cases */
        eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
                                               "client EAP encryption",
                                               EAP_TLS_KEY_LEN);
        if (eapKeyData) {
                *len = EAP_TLS_KEY_LEN;
                wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
                            eapKeyData, EAP_TLS_KEY_LEN);
        } else {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive key");
        }

        return eapKeyData;
}


static Boolean eap_peap_isSuccess(struct eap_sm *sm, void *priv)
{
        struct eap_peap_data *data = priv;
        return data->state == SUCCESS;
}


int eap_server_peap_register(void)
{
        struct eap_method *eap;
        int ret;

        eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
                                      EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
        if (eap == NULL)
                return -1;

        eap->init = eap_peap_init;
        eap->reset = eap_peap_reset;
        eap->buildReq = eap_peap_buildReq;
        eap->check = eap_peap_check;
        eap->process = eap_peap_process;
        eap->isDone = eap_peap_isDone;
        eap->getKey = eap_peap_getKey;
        eap->isSuccess = eap_peap_isSuccess;

        ret = eap_server_method_register(eap);
        if (ret)
                eap_server_method_free(eap);
        return ret;
}